Characteristics Of Piston Vacuum Pump

Composition of piston vacuum pump:

piston vacuum pump is mainly composed of stator, rotor, rotary vane, fixed cover, spring and other parts. The structure uses the rotor which is eccentrically mounted in the stator cavity (the gap between the outer circle of the rotor and the inner surface of the stator is very small) and the two rotating blades which are close to the inner wall of the stator by means of spring tension and centrifugal force, sliding along the inner wall of the stator when the rotor rotates.

Working principle of piston vacuum pump:

When the rotor rotates in the graphic direction, the volume of space A connected with the suction port increases continuously, and the pressure in space A decreases continuously. When the pressure in space A is lower than the pressure in the suction container, according to the gas The principle of pressure equilibrium is that the gas pumped is continuously pumped into the suction chamber A, which is in the process of inspiration. The volume of B cavity is decreasing and the pressure is increasing. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas pushes the exhaust valve away, and the exhausted gas continuously passes through the oil layer in the tank and is discharged into the atmosphere. During the continuous operation of the pump, it continuously sucks. Gas, compression and exhaust process, so as to achieve continuous pumping purposes. In water ring pump, auxiliary exhaust valve is a special structure, generally using rubber ball valve, its role is to eliminate the pump in the operation process of the phenomenon of excessive compression and insufficient compression. These two phenomena can cause excessive power consumption.

Roots Vacuum Pump Hydraulic System

What is roots vacuum pump hydraulic system:

Improper pressure adjustment of Roots vacuum pump hydraulic system causes system fever. Roots vacuum pump hydraulic system is generally high pressure and large flow system.

The programmable controller has introduced roots vacuum pump, which has greatly improved the reliability of the electrical system. At the same time, the pressure of Roots vacuum pump and the working conditions of each system should be observed. After the system works normally, it can be pumped at normal speed. The pumping work of Roots vacuum should be carried out as continuously as possible. The piston of concrete cylinder should be kept running at the maximum stroke in order to give full play to the maximum efficiency of Roots vacuum pump and make concrete cylinder at the same time. The wear is uniform in length direction. If the roots vacuum pump is too high and unstable, the oil temperature will rise. No forced pumping shall be allowed in the case of open crown vibration and difficult pumping of the conveying pipe, and the cause shall be immediately ascertained and eliminated.

From the investigation of fine stone concrete pump, it is found that the temperature of many types of Roots vacuum pump can reach 60 e after 40 minutes of use, and the heat balance temperature of the hydraulic system can reach 70 e or more after 2 hours of use, while the normal heat balance temperature of Roots vacuum pump hydraulic system should be about 50 E. Therefore, the problem of high oil temperature in Roots vacuum pump hydraulic system is the problem of heating. In Roots vacuum pump hydraulic system, safety valve, relief valve and sequence valve are often installed in the system because of the performance requirements. If the pressure of the relief valve is too low, the relief valve will be opened frequently, resulting in overflow loss, resulting in system heating; if the pressure is too high, it will increase the leakage in the system, so that the system heating, therefore, according to the load requirements of the hydraulic system, the correct calculation and adjustment of the relief valve and pressure value, so as to ensure that the system in the provisions. Work within the pressure range. The hammer can be struck by the hammer. Tapered pipes and other parts, and slow pumping or anti pump, to prevent clogging.

SELECTION OF ROOTS VACUUM PUMP UNIT

ROOTS VACUUM PUMP UNIT USES:

Roots Vacuum Pump Unit is a pumping unit composed of Roots Vacuum Pump as the main pump and Water Ring Vacuum Pump as the front pump. It not only can be used to remove ordinary gases, but also can suck gas containing water and a small amount of dust. Compared with the general mechanical vacuum pump, it has the advantages of no fear of oil pollution, no fear of water gas and dust, and compared with the general liquid ring vacuum pump, it has the advantages of high limit vacuum and pumping speed in higher vacuum conditions. It is an ideal vacuum pumping equipment for drying, dehydration and vacuum degassing in textile, food, chemical, pharmaceutical and other industries.

ROOTS VACUUM PUMP PRODUCT FEATURES:

Roots Water Ring Vacuum Unit adopts high efficiency and energy saving water ring vacuum pump as the front pump, so Roots Liquid Ring Vacuum Unit has higher efficiency, compact structure and no leakage than Roots Liquid Ring Vacuum Unit (2BV series is mechanical seal standard design, different from 2SK series packing seal), corrosion resistance (2BV series uses aluminum bronze). Ye Lun) has the advantage of high protection level.

2. The working fluid of the front-stage pump of Roots Vacuum Unit is mostly water. Organic solvents (such as methanol, ethanol, xylene, acetone, etc.) or other liquids can be used. The use of the front-stage pump as a closed-circuit circulation system greatly reduces the pollution to the environment and greatly improves the recovery of organic solvents. The ultimate vacuum degree is determined by the saturated vapor pressure of the working fluid.

INSTALLATION OF WATER RING VACUUM PUMP UNIT

WHAT IS THE WATER RING VACUUM PUMP SET:

Vacuum pump unit (abbreviated as water ring pump) is a kind of coarse vacuum pump. The limit vacuum it can obtain is 2000-4000Pa. The vacuum degree of the unit composed of Roots vacuum pump and vacuum pump can reach 1-600Pa. Water ring pump can also be used as compressor, called water ring compressor, is a low-pressure compressor, its pressure range is 1 ~ 2 *105Pa meter pressure.

To understand the product performance of water-ring vacuum pump set, we should make good use of its basic development advantages, drive its production capacity in all aspects of operation, improve its production standards with the advantages of products, increase the promotion of production performance, improve the quality of its production, and do a good job in its production and application. Expanding, deepening the practical application of products in-depth, with a faster speed of development to promote its superior ability to drive, with a reliable performance development model to continuously promote the quality of its products.

Vacuum Pumps In Chemical Industry

Most mechanical vacuum pumps used in the vacuum industry use water, oil or other polymer fluids as the working medium of the pump. With the development of science and technology and the expansion of vacuum pump application, there are two urgent problems to be solved in the original mechanical vacuum pump and its pumping system. One is that the working medium of the pump is polluted by the backflow of the pumping vessel, which in many cases affects the quality and quantity of the product and increases the cost of equipment maintenance. . Secondly, it is difficult to recover the gas pumped into the vacuum pump during some process, and the medium in the pump is deteriorated.

Dry screw oil-free vacuum pump with its compact and simple structure, non-friction of the original pump chamber, long life, low energy consumption, no oil pollution and other advantages, more and more manufacturers favor. It has an incomparable advantage in the chemical industry, and gradually replaced the traditional mechanical vacuum pump. The easy recovery of chemical gas has greatly saved production costs and reduced the environmental pressure of enterprises.

2X Rotary Vane Vacuum Pump

2X rotary vane vacuum pump is the basic equipment used to extract the gases from a special sealed container and make it obtain a certain vacuum. Due to the high development of modern science and technology, vacuum pump is widely used in various scientific fields and various enterprises and institutions. It can be used in metallurgy, chemical industry, light industry, petroleum, medical treatment, pharmacy, printing and dyeing. Electrical appliances, electric vacuum, semiconductor, food, atomic energy, textile and other scientific research institutions, colleges and universities, industrial and mining enterprises for scientific research and production and teaching purposes.

Because the rotary vane vacuum pump is made of ferrous metal, and more precise, the work of the whole pump is linked together, so rotary vane vacuum pump is not suitable for the removal of excessive oxygen, toxic, explosive corrosion of ferrous metals and the chemical role of various gases in the vacuum oil, nor can it be used as a compressor. And transport pumps.

2X rotary vane vacuum pump pumping process:

Gas enters the high vacuum chamber from the air inlet nozzle, initially high pressure, high and low vacuum chambers are full of atmosphere, both exhaust valves open exhaust. As the exhaust proceeds, the pressure decreases (i.e. the vacuum increases), the pressure in the high vacuum chamber is insufficient to push the exhaust valve open, and the gas enters the low vacuum chamber through the diaphragm. At this time, the pressure is insufficient to push the exhaust valve open, but the low vacuum chamber enters with a certain amount of oil to help push the exhaust valve open, and the gas is also discharged. Oil particles mixed with the exhaust gas are filtered through the oil screen to separate the oil. Only the gas is discharged out of the pump and the gas path is through.

Rotary Vane Vacuum Pump Applied In Vacuum Package Industry

For packaging technology, How vacuum technology to be applied?
Usually, vacuum plays a key role in packaging processes and packaging production. Vacuum technology enables efficient and accurate packaging, thermoforming and coating. In addition, vacuum technology can be used to move, transport, unpack and seal. During the packaging process, the items to be packaged can also be fed and embedded by vacuum.

The process of vacuum packaging and fresh-keeping is to put the food into a special plastic bag, use the rotary vane vacuum pump to suction away the gas in the bag, and then heat the packaged air outlet. After the gas in the bag is suctioned away, vacuum environment is created in the bag, which is characterized by low oxygen partial pressure and low water vapor content; it is beneficial for the gas or other volatile gas inside the food to diffuse into the space. The rotary vane vacuum pump for packaging and fresh-keeping process using these three characteristics to preserve food. Fresh food uses MAP (gas-conditioning packaging technology) to maintain the appearance, freshness and taste of the food.

WHAT VACUUM PUMPS ARE IN THE VACUUM SYSTEM

Vacuum system is composed of vacuum chamber, vacuum pump or vacuum unit, vacuum pipe, vacuum valve, trap and other vacuum components, electrical control system, etc. It is widely used in electronic semiconductor industry, photoelectric backlight module, mechanical processing and other industries. The vacuum system is usually composed of several vacuum pumps, and plays a role in different fields according to their respective characteristics.

1. MAIN PUMP:
The main pump is a vacuum pump which is used to obtain the required vacuum degree to meet the specific technological requirements. According to the different limit pressure required by the vacuum system, the limit pressure of the main pump in the selection process is generally half to one order of magnitude lower than the limit pressure required by the system.

2. ROUGH PUMP:
Coarse pumps are vacuum pumps that start at atmospheric pressure and reduce the pressure of the pumped system to the point where the main pump system can start working.

The pressure reached by the crude pump must be less than the starting working pressure of the main pump. The crude pump can also be used as a front stage pump.

Classification Of Vacuum Units

Vacuum unit is generally named according to the type of main pump, and then can be classified according to product characteristics, such as oil-containing vacuum unit and oil-free vacuum unit; more commonly, according to the scope of vacuum application, can be divided into low vacuum unit, medium vacuum pump unit, high vacuum unit and ultra-high vacuum unit.

The four categories of vacuum units :

Low vacuum unit has high working pressure and large exhaust capacity, which is mainly used for vacuum conveying, vacuum impregnation, vacuum filtration, vacuum degassing of vacuum dryer, etc. Reciprocating pumps, water ring pumps, oil seal mechanical pumps, screw vacuum pumps, wet roots pumps, jet pumps, molecular sieve adsorption pumps and other types of vacuum pumps commonly used in low vacuum units can be competent, but according to the cleanliness, humidity and other conditions of the exhausted gas, it is necessary to configure the excluding Dust, gas, water, oil and water separator, drying trap and other facilities.

Medium vacuum unit is suitable for all kinds of vacuum systems which need large pumping speed and obtain medium vacuum, such as coating machine, vacuum smelting, vacuum heat treatment, medicine and chemical industry, electrical welding and so on. In the past, the combination of Roots Vacuum Pump + Oil Seal Mechanical Pump, Roots Vacuum + Water Ring Vacuum Pump and Double Roots Vacuum Pump was the most common vacuum unit. With the rise of oil-free vacuum pump such as screw vacuum pump, Roots vacuum pump + screw vacuum pump such as oil-free vacuum unit has gradually increased, more adaptable.

Selection Of 2BV Water Ring Vacuum Pump

The 2BV series water ring vacuum pump is a single stage pump with integral structure and machine pump. The shaft seal adopts mechanical seal, which has the characteristics of simple structure, simple installation, no oil, safety and reliability.

2BV series water ring vacuum pumps are suitable for pumping out gas and wet steam. The suction pressure can reach 33 mbar absolute pressure (97% vacuum degree). When 2BV water ring vacuum pumps are working for a long time under the suction pressure lower than 80 mbar, cavitation protection tube should be connected to protect the pump. 2BV water ring vacuum pumps such as air ejector suction pressure. Up to 10mbar, the ejector can be installed directly on the suction port of the vacuum pump. When used as a compressor, the maximum pressure is 0.26MPa (absolute pressure).

2BV series water ring vacuum pumps and compressors are widely used in petroleum, chemical, pharmaceutical, food, sugar industry and other fields. Because the gas compression process is isothermal in the working process, it is not easy to explode when compressing and pumping inflammable and explosive gases, so it is more widely used.

Concept And Selection Method Of Vacuum Pump

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum.

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum. Generally speaking, there is a large range from the atmosphere to the very high vacuum, and so far no vacuum system can cover this range. Therefore, in order to meet the technical specifications of different products, work efficiency and equipment life requirements, different vacuum sections need to choose different vacuum system configuration. In order to achieve optimal configuration, when selecting a vacuum system, the following points should be considered:

1. The type of gas being pumped and the amount of gas pumped:
Check and determine the type and volume of exhaust gas required for the process. Because if the type of gas being pumped is reacted with the liquid in the pump, the pump system will be contaminated. At the same time, we must consider the appropriate exhaust time and the amount of gas generated during the extraction process.

2. Vacuum degree:
It determines the structure of the product, and the vacuum is the two reading of gauge and absolute pressure. Absolute pressure means that reading is absolute, that is, the closer the reading is, the higher the degree of vacuum is. 0′. But the closer the surface pressure is to 760 mmH, the higher the vacuum is. If the absolute pressure (limit vacuum) you require is close to `0′, then only the vacuum pump can meet this demand, but if the demand is close to 1bar (atmospheric pressure), then you can choose Roots or centrifugal fans to meet this demand. Demand.

Vacuum Pump Is Applied In Vacuum Plastic Forming

Vacuum suction molding is one of the common vacuum pump applications, is also a plastic packaging container production commonly used thermoforming method, in the processing of packaging materials industry has a wide range of applications.

What is vacuum molding：

Vacuum suction molding is generally used for making open shell products of thermoplastic sheets. The principle is simply that the plastic sheets are heated to a certain temperature, then softened to viscoelastic state, and then pumped through a vacuum pump to vacuum the mold, forming a vacuum suction pressure difference, so that the sheets are deformed and covered on the mold contour surface, the most. After cooling, shaping and dressing.

The whole set of vacuum plastic suction unit is generally composed of upper and lower heater, temperature controller, bearing plate, press frame, vacuum pump, vacuum chamber, mold temperature controller, cooling device and so on. Parameters are controlled by computer storage, and the control is simple. When a certain type of product is produced, only the corresponding parameters can be adjusted.

Vacuum plastic forming relies on the vacuum pressure difference to make the sheet stretch and deform. At present, the vacuum is easy to realize, master and control, making vacuum molding products with low cost, high production efficiency advantages, has been widely used. Its form can be divided into three types: die less molding, punch (Yang Mo) forming and die (die) molding.

ROOTS VACUUM PUMP UNIT IN PETROLEUM DISTILLATION

The performance and characteristics of Roots vacuum unit are summarized, and the economic benefits obtained by replacing steam jet vacuum pump in petroleum vacuum distillation unit are summarized. It has many functions, but it is not very well known. Then the next small edition on the application of petroleum distillation, to make a brief introduction for everyone, the following look at it.

Almost all the vacuum distillation units in domestic refineries are used to use the traditional steam injection vacuum pump as the main means of evacuation. Although the steam injection vacuum pump is simple in structure, small in maintenance and reliable in operation, it consumes a lot of water vapor and cooling water, but the obtained vacuum degree is low, so that the crude oil can not be deep-dialed, and the oil recovery rate is low. In addition, because a large number of condensate water and oil vapor condensate liquid mixing, which is a waste of oil and serious environmental pollution. In other countries, the so-called "dry distillation" is used in the distillation unit of refineries. In addition to upgrading the original vacuum tower.

The roots vacuum pump unit mainly selects and redesigns the evacuation equipment. Back-cooled Roots vacuum pump is used as the main pumping pump in the United States to overcome the heating of Roots vacuum pump under high pressure. The front stage vacuum pump chooses two-stage water-ring vacuum pump to form the pumping unit, and also needs a cold source to maintain the long-term operation of the unit. Therefore, the design structure is more complex and the cost is more expensive.


Roots Vacuum Pump Unit has a wide range of applications, can not only be used in common areas, in fact, in many more off-the-street industries will also see its shadow, different industries, different fields, it will play a different role, so choose products to be more accurate.

ROOTS BLOWER MANUFACTURER

Roots blower, also known as roots blower. The utility model belongs to a volumetric rotary blower, which uses two or three blade rotors to make relative motion in the cylinder to compress and transport gas. The blower is simple in structure and convenient in manufacture. It is suitable for gas conveying and pressurizing in low pressure situations and can also be used as a vacuum pump.

ROOTS BLOWER WORKING PRINCIPLE:

Roots blower is a volume rotary blower. The compressor keeps the two rotors in mesh by synchronous gears at the rotor shaft ends. Each concave curved surface part of the rotor and the inner wall of the cylinder constitute the working volume, which takes gas from the suction port during the rotor rotation. When the rotor moves to the near exhaust port and communicates with the exhaust port, the pressure in the working volume rises suddenly because of the high pressure gas reflux, and then the gas is transported to the exhaust channel. . The two rotors are not in contact with each other, and they are sealed by a tightly controlled clearance, so the exhausted gas is not contaminated by lubricating oil.

Configuration Of Water Ring Vacuum Pump Unit

What is a water ring vacuum pump set：

Water-ring vacuum pump unit can be understood as water-ring vacuum pump closed cycle system, water-ring vacuum pump negative pressure station, Roots water-ring vacuum unit. This kind of product is called water-ring vacuum pump unit in the eyes of the majority of users.

Configuration of water ring vacuum pump unit:

Water-ring vacuum pump and its vacuum pump unit are used to pump or press gas and other non-corrosive, water-insoluble, non-solid particles of the gas, forming a vacuum or pressure in an airtight container, so as to meet the specific process requirements. A small amount of liquid is allowed in the inhaled or pressurized gas. What are the configurations of the water ring vacuum pump units?

Water-ring vacuum pump unit is generally composed of water-ring vacuum pump, steam-water separator, heat exchanger, one-way valve, water supply solenoid valve, ball valve, pipeline and so on.

The water ring vacuum pump has the advantages of simple structure, compact structure and high rotational speed. It can be directly connected with the motor and does not need deceleration device. Therefore, a large exhaust volume can be obtained by using a small structural size, and thus a higher operating efficiency can be obtained by composing the pump group. Because there is no metal friction surface in the pump cavity, there is no need to lubricate the pump, and the wear is very small. The seals between the rotating parts and the fixings can be directly sealed by water seals.

Because in the working process, this kind of pump compresses the gas in the isothermal state, so it is not easy to occur danger when the inflammable and explosive gas is pumped or pumped, so it can remove the inflammable and explosive gas, in addition, it can also remove the gas containing dust and water. Since there is no exhaust valve and friction surface, dust-laden gas, condensable gas and gas-water mixture can be extracted. With these outstanding features, although it is inefficient, it has been widely applied.

Roots Blower Of Introduction

Roots blower, also known as Roots blower, is a volumetric rotary blower, using two or three blade rotors in the cylinder for relative motion to compress and transport gas rotary compressor. The blower is simple in structure and convenient in manufacture. It is suitable for gas conveying and pressurizing in low pressure situations and can also be used as a vacuum pump. Its biggest characteristic is that when the pressure is adjusted within the allowable range, the flow rate changes slightly, the pressure selection range is very wide, and it has the characteristics of forced gas transmission. When conveying, the medium is not oily. It has simple structure, convenient maintenance, long service life and small vibration of the whole machine.

Due to periodic suction, exhaust and instantaneous constant volume compression, the gas velocity and pressure fluctuation will be caused, which will produce a larger aerodynamic noise. In addition, the clearance between the rotor and between the rotor and the cylinder will cause gas leakage, thus reducing efficiency. The exhaust volume of Roots blower is 0.15 to 150 cubic meters / minute, and the rotation speed is 150~3000 rpm. The single stage pressure ratio is usually less than 1.7, up to 2.1, and can be used in series.

Roots blower transport medium for clean air, clean gas, sulfur dioxide and other inert gases, special gas industries (gas, natural gas, methane, carbon dioxide, sulfur dioxide, etc.) and high-pressure working conditions of the preferred products. In view of the above characteristics, it can be widely used in metallurgy, chemical industry, fertilizer, petrochemical, instrumentation, building materials industry.

According to the shape of the rotor, roots blower is divided into two leaf type and three leaf type. The three leaf rotor is rotated and rotated by two rotors for three times at each rotation. Compared with the two blade type, the gas pulsation is small, the vibration is small, and the noise is low.
The speed of Roots blower is 150~3000 revolutions / min. The flow rate is 0.15-1200 cubic meters per minute, the pressure is 9.8-196 kPa, the power is 0.75-1000 kW, the single machine weight is 100-9000 kg.

Is It Scientific To Check Stainless Steel With A Magnet?

Like the 2BV water ring pump and the 2BE water ring pump, the SS304 material and SS316L material are often used.

Most end users do not have professional material testing equipment. Many customers prefer to use magnets to simply test the raw materials are stainless steel or cast iron.

In fact, it is unscientific to use a magnet for simple test.

1. S ometimes stainless steel is with magnetic when it is machined. Due to the magnetic properties generated during the process, the magnet is attracted.

2. There are many types of stainless steel. In general, austenitic stainless steel and austenitic precipitation hardened stainless steel are non-magnetic (magnets cannot be absorbed), and other stainless steels have ferrite and ferromagnetic (magnet can be sucked). Therefore, stainless steel cannot be judged only by the presence or absence of magnetism. For stainless steel, it is indeed stainless steel if it can match used the quality standards.

Classification Of Distillation Processes

Distillation process is often used in pharmaceutical, petrochemical and other fields, such as vacuum distillation is a screw vacuum pump products in petrochemical, chemical and pharmaceutical fields, a major application direction, but distillation process also has many classifications.

Distillation is a kind of separation technology which uses the difference of boiling point of substance to separate and purify some mixed liquid or liquid-solid mixture by evaporation and condensation.there are many kinds and ways of distillation.

If carried out under different pressures, atmospheric distillation, vacuum distillation and pressurized distillation are carried out. The difference lies in the common vacuum distillation, which is not easy to volatilize or decompose at room temperature, and the pressurized distillation, which is mostly gas-liquid mixture or gaseous at room temperature.

According to the different process, batch distillation and continuous distillation can be divided into two parts. Intermittent distillation is often used in small-scale production or some special occasions, and industrial production of large quantities of materials, usually using continuous distillation.

Single-Pole Rotary Vacuum Pump Principles Operation

Single-pole rotary vacuum pump is a novel and well-planned single-pole rotary vacuum pump, which can operate at the inlet pressure.

Brief introduction of single-pole rotary vacuum pump:

1. Oil mist eliminator is installed inside the pump, which can effectively eliminate the oil mist in the gas discharged by the pump and avoid the pollution of the surrounding environment caused by the oil mist.

2. Installed with a check valve in the suction port of the pump, when the pump is interrupted, the check valve and the hole specially arranged in the pump can isolate the pump and the pumped system immediately, avoid the pump oil returning to the pumped system, and together adhere to the true width of the pumped container, so the use of this type of vacuum pump can be no longer equipped with discharge. The vacuum cut-off valve of the gas can then reduce the user’s use cost.

3. The pump is equipped with an oil-gas separator, which together with an oil mist eliminator forms a useful silencing system to eliminate exhaust noise and avoid noise pollution.

4. Pump and motor directly connected equipment, choose air cooling, do not need water cooling pipes, so this model is a compact planning, simple equipment.

5.plan description is reasonable, vibration is small, no foundation bolts can be operated.

SELECTION OF MEDICAL VACUUM PUMP

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum. Generally speaking, there is a large range from the atmosphere to the very high vacuum, and so far no vacuum system can cover this range. Therefore, in order to meet the technical specifications of different products, work efficiency and equipment life requirements, different vacuum sections need to choose different vacuum system configuration.

Medical vacuum system is an important part of hospital design and construction. Its main application principle is negative pressure suction. In the construction of medical vacuum pump system, the selection of medical vacuum pump is different from the general selection of industrial vacuum pump. These differences mainly involve three aspects.

Application Of Vacuum Pump In Wood Drying

In various heating and drying methods under normal pressure, the color, aroma, taste and nutrients of the material are subject to a certain degree of loss due to the heat of the material. If the method of vacuum drying is used, the loss of quality can be reduced by the fact that the air is isolated under a negative pressure state, and a material which is susceptible to chemical changes such as oxidation during the drying process can better maintain the original characteristics. Vacuum drying is to place the dried food material in a closed drying chamber. While vacuuming with a vacuum system, the material to be dried is heated appropriately, so that the moisture inside the material diffuses to the surface through pressure difference or concentration difference. Sufficient kinetic energy is obtained on the surface of the material, and after overcoming the attraction between the molecules, it escapes into the low-pressure air of the vacuum chamber and is removed by the vacuum pump.

Vacuum drying, also known as analytical drying, is a drying method in which the material is placed under a vacuum condition, and the boiling point under a negative pressure state is appropriately heated or the material is solidified and then dried by a melting point by cooling. Vacuum drying technology has been widely used in the production of health foods, especially the extraction of natural product extracts, which are widely used for vacuum drying because many of the functional ingredients in natural products are not resistant to high temperatures. Vacuum drying technology, also known as vacuum drying, is a method of removing air in a closed container and drying it under reduced pressure.

Under the negative pressure state, the boiling point of the melting point decreases with the increase of the vacuum degree. At the same time, the vacuum pump gap is used to reduce the water vapor content, so that the water and other solutions in the material can get enough kinetic energy to leave the surface of the material. Vacuum drying Because the air is isolated under the negative pressure condition, the chemically changed materials which are easily oxidized during the drying process can better maintain the original characteristics, and the material can be better protected by vacuuming after injecting the inert gas.

Dry Vacuum Pump Application

What is dry vacuum pump?

Dry vacuum pump is a kind of mechanical vacuum pump which can start pumping under atmospheric pressure, and can directly discharge the pumped gas into the atmosphere. There is no oil or other working medium in the pump cavity, and the pump’s limit pressure is equal to or close to that of oil-sealed vacuum pump.

After years of industrial application of high vacuum system development, we often take oil diffusion pump as the main vacuum pump, oil seal mechanical pump as the front pump to form a universal high vacuum system, that is, the so-called wet vacuum system. For the vacuum pump of this system, it is clearly pointed out that it is not suitable for the extraction of gases containing excessive O2, explosive, corrosive, chemical reaction to pump oil and particles of dust. Why are there restrictions on gas extraction? It is because there is oil in the pump.

However, modern industrialization requires higher requirements. Under clean conditions, only air or a little water vapor is pumped. Under medium conditions, reactive gases are pumped out, but no solid particles are produced. Under adverse conditions, chemical reactants (toxic or even carcinogenic) and solid particles are pumped out.

In order to meet the requirements of different application fields and different working conditions, foreign countries have multi-stage Roots vacuum pump, multi-stage claw vacuum pump, screw vacuum pump, scroll vacuum pump, reciprocating piston vacuum pump and turbine oil-free vacuum pump. The limit pressure is 10-10-2 Pa and the pumping speed is 20-500 m3/h. However, the application of domestic dry pumps is less than 3% at present. All the domestic semi-conductor dry pumps are imported from abroad, and their prices are very expensive. Therefore, China should study and develop dry pumps vigorously to make dry pumps become a new economic growth point of vacuum industry in China.

Air Cooled Roots Vacuum Pump

Because of its special structure design, air-cooled Roots vacuum pump can operate reliably for a long time under high pressure difference and high compression ratio. Cooling gas from both sides of the pump body into the pump suction chamber, so that the pump will not appear because of compressed gas overheating, but the pump pumping performance has no impact. The rotor rotates in the pump cavity and completes the process of suction and exhaust. Coolers and motors are necessary accessories for each pump. The specifications of coolers and motors are determined according to different operating conditions.

The working principle of the air cooled roots vacuum pump:

Gas circulating cooling Roots vacuum pump is mainly composed of rotor 1, rotor 2, pump 4, cooler 7 and so on. Because of its special structure design, it can operate reliably for a long time under high pressure difference and high compression ratio. Cooling gas from both sides of the pump body into the pump suction chamber, so that the pump will not appear because of compressed gas overheating, but the pump pumping performance has no impact. The rotor rotates in the pump cavity and completes the process of suction and exhaust. Coolers and motors are necessary accessories for each pump. The specifications of coolers and motors are determined according to different operating conditions. Pumps can be used alone or in series with more than one pump, or with liquid ring vacuum pump and ordinary Roots vacuum pump in series into a unit to achieve higher vacuum to meet various technical requirements.

ROOTS WATER RING UNIT

Roots water ring unit is a pumping unit composed of roots pump as the main pump, water ring pump or Roots-Water ring unit as the front-stage pump. It can be used to extract not only ordinary gases, but also gases containing water, organic solvents or a small amount of dust. Compared with the general mechanical vacuum pump, not afraid of oil pollution, not afraid of water gas and dust, and compared with the general water ring vacuum pump, with a high degree of vacuum and pumping speed under high vacuum conditions

Roots Pump-Water ring pump vacuum unit is widely used in chemical industry, electronics, machinery, pharmaceuticals, food sublimation drying, high altitude simulation test and other vacuum systems.

Because the water ring pump with high efficiency and energy saving is used as the front-stage pump, the vacuum unit has the advantages of high efficiency, compact structure, no leakage, corrosion resistance and high protection level.

When the working fluid in the front-stage pump is changed into oil, the limit vacuum degree of Roots vacuum unit can be effectively increased (see parametric table). Roots oil-ring unit is a closed-circuit circulation system, which can reduce pollution and save water. Roots oil ring vacuum unit is widely used in vacuum impregnation, vacuum drying, vacuum degassing and so on.

The working fluid of the front-stage pump can also use organic solvents or other liquids, and the front-stage pump can be used as a closed-circuit circulation system, which greatly reduces the pollution to the environment and greatly improves the recovery of organic solvents. The ultimate vacuum degree is determined by the saturated vapor pressure of the working fluid.

HOW TO INSTALL VACUUM PUMP

In order to meet the relevant production requirements, vacuum pump has also become a very important kind of equipment in the production process, and attention to this kind of equipment, the overall installation is also an important part. Attention should be paid to installation occasions and installation steps, only after the correct installation of the pump body can enter a better working state.

When operating vacuum pump installation should pay attention to, can maintain the ground solid is often a very important part of this part of the work should be done. And it is also important to sit down from the pump body, at this time to take to maintain the level and shock absorption can have better operation, can make the working state better. Especially in the connection of the actual system pipeline is also very important, in the connection of the overall sealing has also attracted people's attention.

Valves and vacuum gauges above the intake are also important equipment that should be better grasped in order to allow for better inspection of pressure during operation. And from the overall cooling water should also pay attention to the installation order in accordance with the specific provisions of water is also very important. In order to make the work more smoothly, it is also a good operation to connect the exhaust port.

Selection Of Vacuum Pump

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum. Generally speaking, there is a large range from the atmosphere to the very high vacuum, and so far no vacuum system can cover this range. Therefore, in order to meet the technical specifications of different products, work efficiency and equipment life requirements, different vacuum sections need to choose different vacuum system configuration. In order to achieve the best configuration, the following points should be considered when selecting the vacuum system.

What matters should be noted when selecting the vacuum pump：

1. The limit pressure of the vacuum pump should meet the working pressure of the process. Usually, the limit pressure of the pump is about an order of magnitude lower than the technological requirement.

2. each pump has a certain range of work pressure. Therefore, the working point of the pump should be selected within this range, and it should not be allowed to work for a long time beyond the allowable working pressure.

3. The vacuum pump should be able to drain all the gas produced in the process of vacuum equipment under its working pressure.

4. Choose vacuum unit:

(1) When using a pump can not meet the requirements of pumping and vacuum, several pumps need to be combined to complement each other to meet the process requirements.

(2) Some vacuum pumps can not work at atmospheric pressure, need pre-vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, need a front-stage pump, so we need to use the pump together. After combined use of the vacuum pump, we call it the vacuum pump unit, it can make the vacuum system get better vacuum and exhaust capacity. We should correctly select the combination of vacuum pumps, because different vacuum pumps have different requirements for the extraction of gas, such as: in general, Roots-Rotary Unit is not suitable for systems containing more condensable gases.

Vacuum Pump Piping Arrangement And Installation

The newly installed vacuum pump pipeline must remove the impurities in the pipeline and install a filter screen. The open-type working fluid supply mode is to adjust the liquid seal level of the gas-liquid separator by manually adjusting the gate valve at the bottom of the gas-liquid separator. The liquid level of the gas-liquid separator will change when the water-ring vacuum pump is just started or when the discharge pressure changes. If the liquid level of the gas-liquid separator is emptied, the gas will be discharged from the bottom of the gas-liquid separator. If the gas is poisonous or inflammable and explosive, the gas will leak from the discharge gate valve of the gas-liquid separator, which will cause major safety accidents.

Installation of vacuum pump piping:

1.pipeline installation, especially the intake pipeline, first remove pipeline slag, rust and dirt.

2. for newly opened pipelines, 20-30 mesh / inch screen should be installed. The filter mesh is clamped between the two flanges of the pipeline, and the outer circumference of the filter mesh should leave a certain amount of clamping allowance to avoid being sucked into the vacuum compressor. After a period of time, confirm that there is no foreign matter in the pipeline.

3.The new pipeline filter mesh is easy to be blocked by impurities, which will affect the inhalation of gas. It should be removed and cleaned in time.

4.Generally, the first operation of a week, to stop cleaning the filter screen, and then run for three weeks, for the second cleaning, until the system is clean, you can remove the filter screen. The water supply pipeline should be cleaned with water before connecting to the vacuum compressor to ensure that the water pipe impurities are washed before connecting to use.

Vacuum pump start up:
1.The grease in the bearing cavity of vacuum compressor should be replaced before starting, and the bearing cavity should be cleaned with gasoline before replacing.

2.Wash the water in the vacuum compressor through the liquid supply pipeline, move the rotor by hand, and then drain the sewage through the liquid discharge pipeline. For units that have been commissioned or put into operation for more than two days, when restarting, wash them with water and coil, so as to avoid internal rust and scaling, which will cause difficulties in starting and burning the motor.

3.check whether the electrical part is safe and correct.

4.Check the rotation direction of the motor to make it conform to the steering of the liquid ring vacuum compressor.

5.check whether the coupling cover or belt cover is reliably fixed.

When the operation of the vacuum compressor is stable, adjust the gate valve to make the reading of the pressure gauge of the liquid supply pipeline consistent with the discharge pressure of the vacuum compressor. At this time, slowly close the gate valve. When the reading of the discharge pressure gauge is unstable, it shows that the liquid supply is insufficient. Slowly open the gate valve, when the reading of the pressure on the discharge side is stable, at this time For the best liquid supply, write down this readout, and then read it every time you turn on the machine. The speed of the regulating gate valve must be slow, because it takes several minutes to reflect the change from the amount of liquid supplied to the performance of the vacuum compressor.

OIL ROTARY VANE VACUUM PUMP MANUFACTURER

SELECTION OF SINGLE STAGE ROTARY VANE AND DOUBLE STAGE ROTARY VANE VACUUM PUMPS:

Because the two-stage rotary vane vacuum pump has one more cylinder block than the single-stage rotary vane vacuum pump in structure, the extracted gas is compressed by the multi-stage cylinder block, and the final vacuum degree is much better than the single-stage rotary vane vacuum pump. For example, the vacuum of a single-stage rotary vane vacuum pump is 0.1-0.5mbar, while the vacuum of a two-stage vacuum pump can reach about 4*10-4 mbar.



For the production process, the higher the vacuum is not the better, suitable for their own production needs, is the best choice. Too low vacuum will make the product can not achieve the desired effect, requiring secondary processing, increasing cost; and too high vacuum, may damage the product density, or even make the product irreparable, resulting in scrap products.

In terms of industrial use, the oil-type rotary vane vacuum pump has a wider range of applications and is recognized and used by a larger group. Typically used in vacuum packaging and food processing technology thermoforming (suction, vacuuming, foaming molding) vacuum degassing, defoaming, infiltration, concentration, drying vacuum adsorption, fixture, hanger, sucker, etc. Oil-type rotary vane vacuum pump in practical application can be according to the needs of the customer's own manufacturing process to transform the industrial vacuum central system into The powerful front pump supplies the vacuum needed for the production process.

Piston Vacuum Pump Technology

Piston vacuum pump is a product with excellent quality, excellent performance, high reliability and reasonable price. It has been sold to Europe, the United States, Japan and more than a dozen advanced countries, and most of the direct use of customer recognition and affirmation. This series of piston vacuum pumps can be widely used in automation equipment, industrial machinery, laboratory use, air testing equipment, photoelectric semiconductor, medical and pharmaceutical applications.

The main components of piston vacuum pump :
1. front cover: prevent injury to operators;
2. motor cooling fan: high efficiency heat dissipation, reduce motor temperature rise;
3. piston ring: special wear resistant material, long running life.
4. piston connecting rod: solid and lightweight design.
5. chassis: aluminum alloy die-casting, lightweight and beautiful appearance.
6. cylinder: wear hardness treatment, long service life;
7. valve metal plate: solid structure;

Piston vacuum pump technology:

In addition to the above main components, there are exhaust valves and suction valves and other important components, as well as frame, crankcase, dynamic seal and static seal and other auxiliary components. When running, driven by the motor, the piston in the cylinder reciprocates through the action of the crank-connecting rod mechanism (rotation into linear motion). When the piston moves from the left end to the right end of the cylinder, the pressure in the left chamber space decreases because of the increasing volume of the left chamber. When the pressure in the left chamber space is lower than that in the pumped container, according to the principle of gas pressure balance, the gas in the pumped container is continuously pumped into the left chamber through the suction valve. It is in the process of inspiration.

When the piston reaches the right position, the left chamber of the cylinder is filled with gas. Then the piston moves from the right side to the left side, and the suction valve automatically closes. The gas gradually compresses as the piston moves from right to left. When the gas in the cylinder reaches the exhaust pressure, the exhaust valve is opened and the gas is exhausted, thus completing a working cycle. When the piston moves from the left end to the right end, repeat the above cycle, so that the pumped vessel eventually achieves a stable equilibrium pressure to improve the pumping efficiency, generally at both ends of the cylinder are equipped with suction valves and exhaust valves, and then the two ends of the cylinder suction and exhaust ports are connected in parallel with the pipeline.

Piston vacuum pump has the characteristics of high efficiency, energy saving, safety and environmental protection, stable operation, long life, low temperature rise, small volume, light weight, beautiful appearance, simple structure, no oil and easy maintenance. Because of its sophisticated structure and the use of modern advanced technology, the noise level is only 48.7-60.0 dB, keeping the use of quiet environment, to avoid interference by noise operators. Its pumping speed range is relatively large, from 50L/S to 600L/S, as a transport pump, pumping non-solid particles, non-corrosive gas, this vacuum pump pumping speed is higher, higher vacuum.

Piston vacuum pump is very suitable for manipulator with vacuum absorption technology to carry small pieces of materials in the current automation industry. It is suitable for grasping thin and smooth surface metal products, glass, mobile phone panel, electronic components, paper, etc. with vacuum suction cup. It achieves stable and efficient work efficiency. There are more and more cases of using piston vacuum pump to grab objects on automatic operation lines such as product packaging, object transmission and mechanical assembly. Soft and flexible sucker can easily carry out such functions as the suction, release, transfer of the workpiece, and ensure that it does not damage the object of its function.

What Is Oil Rotary Vane Vacuum Pump?

What is vacuum?

Vacuum is a state of space in which no matter exists. In fact, in vacuum technology, vacuum is directed against the atmosphere. Industrial vacuum refers to the space of gases whose pressure is less than the standard atmospheric pressure. Generally speaking, it refers to the rareness of gases in a given space. Vacuum in industrial applications can be broadly classified into three categories: high vacuum, medium vacuum and low vacuum. People get the vacuum through various ways, and the rotary vane vacuum pump is one of the most basic vacuum acquisition equipment in vacuum technology.

What is oil rotary vane vacuum pump?

Rotary vane pumps are mostly small and medium sized pumps. Rotary vane vacuum pump rotates in the pump chamber by a bias rotor with a rotating vane, so that the volume of the pump chamber divided by the rotating vane changes periodically to achieve the process of suction, compression and exhaust, thus achieving the purpose of continuous suction. Generally speaking, according to the operation mode, there are oil-type rotary vane vacuum pump and non-oil-type rotary vane vacuum pump, that is, there is the difference between oil lubrication and non-oil lubrication; according to the cylinder block classification, single-stage and two-stage mainly. The so-called two-stage, is in the structure of the two single-stage pump series together, generally made into two-stage, in order to obtain a higher vacuum.

Rotary vane vacuum pump can extract the dry gas from the sealed container. If it is equipped with a gas ballast device, it can also extract a certain amount of condensable gas. But it is not suitable for the extraction of oxygen-rich, corrosive to metals, chemical reactions to pump oil, and gas containing particulate dust. Most of the rotary vane vacuum pumps adopt a direct structure, which can start vacuum directly in the atmosphere, equipped with air filters to effectively isolate small dust particles, and have a longer service life.

The advantages and disadvantages of the oil rotary vane pump and the oil-free rotary vane vacuum pump:
1. Oil-type rotary vane vacuum pump compared with the same speed of oil-free rotary vane pump, oil-type rotary vane vacuum pump vacuum degree is higher. Oil-type rotary vane vacuum pump in continuous operation due to mechanical seals and lubricating oil double-layer seal, making the vacuum pump in a series of pumping, compression and exhaust action more stable, gas leakage rate reduced.

2. The susceptibility of the oil-type rotary vane vacuum pump to water is easier than that of the oil-free rotary vane vacuum pump. Because of the restriction of the vane, the oil-free rotary vane vacuum pump is easy to expand and break after contacting water, and has high susceptibility to water. It is widely used in industries with limited water content. In the trend of paying more and more attention to environmental protection, the oil-type rotary vane vacuum pump with oil-water separator structure has been recognized and used by the public, effectively protecting the environment clean. For example, circuit board industry, glass process production and so on.

3. Although oil-free rotary vane vacuum pump is slightly inferior to oil-based rotary vane vacuum pump to a certain extent, it is easier to be adopted by customers in some oil-sensitive industries because it does not need oil lubrication. Oil-free operation can limit the influence of oil quality on products and reduce oil pollution caused by chemical reaction between oil quality and products. For example, the pharmaceutical industry, printing process and so on.

PUMPING RATE OF ROOTS VACUUM PUMP UNIT

Roots water ring vacuum unit is made up of roots pump main pump and water ring pump as series pump.

The water ring pump is more advantageous than other vacuum pumps in Roots water ring vacuum unit. It overcomes the limit pressure difference (the limit pressure of the unit is much higher than that of the water ring pump) when a single water ring pump is used, and has the disadvantage of low pumping rate under certain pressure. At the same time, it keeps the Roots pump working quickly and pumping greatly. The advantages of gas rate.

Especially suitable for pumping a large number of condensable steam, especially when the gas-filled oil seal mechanical vacuum pump is not enough to remove condensable steam, or the use of solvent can deteriorate the performance of the pump oil, or the vacuum system does not allow oil pollution more obvious. When equipped with explosion-proof motors and electrical appliances and comply with the corresponding safety rules, flammable and explosive gases can also be extracted.

Roots Vacuum Pump Unit in the selection of time to consider a variety of parameters, such as its efficiency, pumping rate and other issues, each problem may be the cause of equipment failure, therefore, in order to better use the equipment, we need to further understand and understanding of it, today I focus on for you to enter A simple analysis of the pumping rate of Roots vacuum pump unit is hoped to be helpful to all of you.

Maintenance Of Roots Vacuum Pump Unit

Roots Pump-Water ring pump unit is widely used in vacuum distillation, vacuum evaporation, dehydration and crystallization in chemical industry; freeze drying in food industry; vacuum drying in pharmaceutical industry; polyester chips in light textile industry; high altitude simulation test and other vacuum systems.

Roots Vacuum Pump Unit has a very big development prospect in our country, with the development of industry is increasing demand, but such a large workload of use, for the equipment itself, if not timely maintenance and maintenance, for our future use is very unfavorable, for quality will also have a certain harm. Therefore, we must do a good job in the corresponding work. Next we will know the maintenance of it.

Maintenance steps of Roots vacuum pump unit:

1. Roots Vacuum Pump Unit is very hot, this is because we choose the front pump pumping speed is not enough, resulting in excessive compression ratio high inlet pressure, poor cooling, gear box lubricant is too high, rotor and pump shell contact, gear, bearing, oil seal lubrication is not good. The solution is not difficult, as long as we re-select the front pump, adjust, control the inlet pressure, smooth cooling, adjust the amount of oil, repair, to ensure that the amount of oil appropriate, good lubrication;

2. In Roots Vacuum Pump Unit operation instability, excessive noise, low efficiency and so on, these problems are actually related to our own maintenance, the first work instability, because of voltage, improper assembly and other reasons. Too much noise is caused by smooth installation or insufficient lubrication, so try to lubricate the machine.

3. Sometimes the pipeline conductivity of Roots vacuum pump unit is not enough, the pumping speed of the front-stage pump decreases, the relief valve leaks, resulting in insufficient pumping speed and so on. The absolute solution is to increase the pipeline conductivity, repair or replace the front-stage pump, and clean up the relief valve.

The use and maintenance of Roots Vacuum Pump Unit still depends on the actual method. If there are problems in the equipment, we should analyze and judge according to the actual situation. We can’t make a final conclusion. If we pay more attention to the daily life, we will avoid many problems.

Vacuum Pump Ultimate Pressure

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum.

The function of the vacuum pump is to extract gas molecules from the vacuum chamber, reduce the pressure of the gas in the vacuum chamber, so as to achieve the required vacuum. Generally speaking, there is a large range from the atmosphere to the very high vacuum, and so far no vacuum system can cover this range. Therefore, in order to meet the technical specifications of different products, work efficiency and equipment life requirements, different vacuum sections need to choose different vacuum system configuration.

The absolute pressure of vacuum pump means absolute pressure, which is the real vacuum pressure generated by vacuum pump. Absolute vacuum is absolute vacuum pressure. Absolute pressure = local atmospheric pressure + surface pressure (relative pressure), the smaller the absolute pressure is, the closer to vacuum!


Limit vacuum indicates that there is no substance (including molecule, atom, etc.) in this state, which is only a state of existence in theory and is impossible to achieve; it is an important parameter of vacuum pump, is the characteristic value of the pumping capacity of reaction pump, is a value related to vacuum pump, different vacuum pumps can have Different limiting vacuum; it is a concept in theoretical research and an ideal vacuum state refined by excluding the influence of various practical factors. So they are two different descriptions of the vacuum degree of the vacuum pump.

Ultimate pressure of vacuum pump:

The partial pressure is the pressure of the non condensable gas in the gas. The total pressure refers to all gases in the gas.

The pressure of the pressure. In vacuum applications, partial pressure and total pressure have their own application areas. Study on the current vacuum pump

In the nuclear standard, if the total pressure is not specified, the limit pressure index is all partial pressure. 10-3 Torr = 1.33 * 10-1 PA slide valve pump and rotary vane pump can reach; now domestic and foreign rotary vane pump can be 6 * 10-2 Pa Avenue

OIL DIFFUSION PUMP PRICE

The oil diffusion pump should also be applied to electronic industry, chemical industry, atomic energy industry and space simulation test. Oil diffusion pump is used for high vacuum and ultra-high vacuum pumping high vacuum system without serious harm to the working fluid gas, it can not directly exhaust to the atmosphere, the need to equip the front pump.

OIL DIFFUSION PUMP STRUCTURE:

The oil diffusion pump is mainly composed of pump body, diffusion nozzle, steam conduit, oil pan, heater, diffuser, cooling system and jet nozzle.

THE WORKING PRINCIPLE OF OIL DIFFUSION PUMP:

The current stage pump pumps the diffusion pump into the pre-vacuum of about 10 pa, and the working fluid with low saturated vapor pressure at room temperature is heated by a heater. The generated oil vapor moves upward along the steam duct, directed by several stages of nozzles and spews out at high speed, bringing the gas diffused in the oil vapor to the front stage. The oil vapor is ejected into the air from the front stage pump. After the pump wall is cooled, the oil vapor flows back to the bottom of the pump and repeats its work to achieve high vacuum.

What Is The Piston Vacuum Pump

Piston Vacuum Pump is a kind of variable capacity gas transmission pump. It has the advantages of good energy saving effect, high vacuum and large pumping capacity. In addition, compared with rotary pump, the durability of the slide valve pump has more advantages.

What is the piston vacuum pump：

Slide valve pumps have single-stage H-type, two-stage 2H-type slide valve vacuum pumps for the suction of air and other general gases, when the use of gas ballast, can also suck containing a small amount of palm condensable gases (such as water vapor). Additional devices should be used when sucking gases that contain excessive oxygen, are explosive, are corrosive to ferrous metals, and react chemically with vacuum oil.

Application range of piston vacuum pump:

This type of pump can be used alone, also can be used as diffusion pump, oil booster pump, roots pump and other high vacuum pump front pump, relative to rotary vane vacuum pump, H type slide valve pump is more durable, long service life. The pump is widely used in vacuum coating, vacuum heat treatment, vacuum sintering, molecular distillation and aviation simulation test.

Oil Diffusion Pump Operation

Oil diffusion pump is a vacuum pump using low pressure, high speed and directional flow of oil vapor jet. The limit vacuum of this pump is 10-4-10-5 Pa, the working pressure range is 10-1-10-4 Pa, the pumping speed range is several hundred thousand liters/sec (1 liter = 10-3 m 3). Oil diffusion pump is the main equipment to obtain high vacuum. It is widely used in vacuum smelting, vacuum coating, space simulation test and some vacuum systems insensitive to oil pollution.

Operation procedure of oil diffusion pump:

The operation of the oil diffusion pump includes two operations: opening the pump and stopping the pump.

The pump opening sequence of oil diffusion pump:

1. Turn on the cooling water of the diffusion pump, pre-vacuum with the mechanical pump, after the pressure of the diffusion pump is lower than 10-1Pa, turn on the power supply of the diffusion pump to heat the electric furnace and heat the diffusion pump.

2. For small pumps below K-400, the pump can work normally after 45 minutes of heating, and for large pumps between K-500 and K-1200, it needs 45-65 minutes of heating before it can work normally. Therefore, when using the diffusion pump vacuum system, we should pay attention to arranging the start-up time of the diffusion pump.

3. open the diffusion pump population valve, the pump can work normally.

2SK Liquid Ring Vacuum Pump

The 2SK-P1 series two-stage liquid ring vacuum pump-air jet pump unit mainly works under the adiabatic pressure of 10-50mmHg, but its efficiency is low in the high vacuum region. If the Roots water-ring vacuum unit is needed for long-term operation, the best pumping efficiency in the high vacuum region can be obtained.

2SK liquid ring vacuum pump and 2SK-P1 series two-stage liquid ring vacuum pump-atmospheric jet pump unit are used to pump air and other non-corrosive, water-insoluble, non-solid particles in order to obtain a higher vacuum in an airtight container.

2SK liquid ring vacuum pump is widely used in food, textile, chemical, pharmaceutical and metallurgical industries and electronic fields such as vacuum evaporation, vacuum concentration, vacuum moisture regain, vacuum impregnation, vacuum drying and vacuum smelting.

The 2SK series is used for working conditions with suction pressure below – 0.08MPa, and the 2SK – P1 series is used for working conditions with suction pressure below – 0.096MPa.

Features of 2SK liquid ring vacuum pump：

1. Compared with SK series single-stage liquid ring vacuum pump, it has the characteristics of high vacuum and high pumping speed in high vacuum region.

2. Under the same pumping speed, the shaft power is obviously higher than that of 2BV and 2BE series water ring vacuum pumps.

3. because the structure is a double leaf wheel structure, manufacturing and maintenance are more complex and more vulnerable parts.

HOW TO CHOOSE VACUUM PUMP SYSTEM

Vacuum pump unit is composed of pump as the main pump and other types of pump as the front pump in series. Therefore, when choosing vacuum pump unit, we should first combine its application field and application site to select the pump body properties of each part of the vacuum pump unit.

SELECTION OF VACUUM PUMP UNITS:

1. choose the vacuum pump unit correctly. Each pump has a certain range of working pressure, in such a wide range of pressure, pump speed varies with pressure. Therefore, the working point of pump should be selected in this range.

2. Requirements for vacuum equipment for oil pollution. If the equipment strictly requires oil-free, should choose a variety of oil-free pumps, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, cryogenic pump. If the requirements are not strict, you can choose an oil pump, coupled with some anti-oil pollution measures, such as cooling trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.

3. correctly combined vacuum pump unit. Because the vacuum pump has selective pumping, so sometimes choose a pump can not meet the pumping requirements, the need for several pumps combined to complement each other to meet the pumping requirements. Some vacuum pumps can not work under atmospheric pressure, need pre-vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, need the front pump, so we need to use the pump together.

POINTS FOR ATTENTION IN THE USE OF VACUUM PUMP UNIT:

1. between the distillation system and the vacuum pump unit, the absorption device must be installed.

2. Before distillation, the steam of organic solvent must be thoroughly pumped out of the system.
3. If the pump can be used to pump, then try to pump, such as distillation substances containing volatile substances, can first pump pressure reduction pumping, and then switch to oil pumps.