Knowledge of vacuum pump shell material

There are many kinds of vacuum pump materials, such as metal alloy, ceramic, rubber plastic, glass quartz, carbon fiber and so on. And the vacuum pump shell material is mainly two categories: metal and glass. 

As the material of vacuum shell, metal mainly includes iron, copper and aluminum based metals and various alloys, such as low carbon steel, stainless steel, oxygen free copper, red copper, aluminum and steel or iron materials coated with aluminum, copper and nickel. They have good mechanical strength and machinability. Various metal materials have different performance and outgassing rate according to different vacuum application characteristics. The physical and mechanical properties of various metal alloys can be inquired.

Glass is mainly used in some glass vacuum system (such as glass diffusion pump, valve), observation window and some regulatory shell, high-voltage electrode insulator, etc. it has the advantages of transparency, low price, easy processing and insulation, but the disadvantage is low strength and fragile. According to the different softening temperature and expansion coefficient, there are soft glass, hard glass and quartz glass with different properties.

Whether it is metal or glass, the shell material of vacuum pump needs to have: certain mechanical strength and stiffness, which can ensure that it can withstand atmospheric pressure at normal temperature and baking temperature without deformation; good air tightness, without defects such as porous structure, cracks and other leakage; low gas outlet rate and penetration rate; low saturated vapor pressure under working temperature and baking temperature It has good chemical stability, is not easy to oxidize and corrode, and will not react with the working medium in the system; it has good temperature stability and can maintain its vacuum performance and mechanical property within a certain temperature range; it is easy to process, has good welding performance and good economy.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Influence of cooling system temperature on the performance of vacuum pump unit

 In summer, the temperature of closed water can reach 35 ℃. Therefore, it is difficult to guarantee the supercooling degree of 4.2 ℃ in the actual operation of vacuum pump. As the sealing water temperature approaches to saturation, its pumping capacity also decreases, until saturated vaporization and loss of working capacity. 

The working pressure of the vacuum pump and the pressure of the condenser is a dynamic balance process. No matter how high or low the circulating water temperature is, the suction pressure of the vacuum pump must be lower than that of the condenser in order to pump the non condensable gas from the condenser. Therefore, the sealing water temperature of vacuum pump must be lower than the saturation temperature corresponding to the exhaust pressure.

The situation of vacuum drop is that the sealing water in the vacuum pump is vaporized because the water in the gas water separator is not changed in time. A few days later, the test was carried out on vacuum pump a of No.2 unit. After adding 16 ℃ cold water into pump a, the temperature of separator was 16.2 ℃. After starting pump a, the temperature rose to 24.5 ℃. With the increase of temperature, the vacuum decreased. When the water temperature was 30 ℃, the vacuum increased about 1kPa and the current of vacuum pump increased about 0.85a. When the working water temperature drops by 1 ℃, the vacuum increases by about 0.19kpa. It can be seen from the test that it is an important means to ensure the vacuum of the vacuum unit to ensure the lower temperature of the sealing water of the vacuum pump in summer.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Choose vacuum valve rubber gasket seal

In the application of vacuum system, the installation of vacuum valve needs rubber gasket seal or metal gasket seal to ensure the sealing performance of the system.

Rubber gasket seal is made of rubber material, which uses the rubber gasket pressed between valve plate and valve seat, and fills the uneven surface by elastic deformation of rubber to realize sealing. In the selection process, attention should be paid to:

1、 The selected rubber gasket sealing structure should be simple and easy to manufacture.

2、 The seal shall be easy to disassemble and repair. 

3、 As far as possible to reduce the bleeding factor of the high vacuum side under the valve plate, such as choosing the gasket material with low outgassing rate.

4、 After closing the valve, the rubber seal ring section should have the maximum compression deformation.

At the same time, the uneven degree of the rubber gasket sealing seat surface determines the sealing performance when the vacuum valve is closed. Therefore, it is necessary to consider the hardness of the rubber gasket sealing material, the degree of compaction and the surface roughness of the valve seat, and determine the compression ratio of the gasket according to these, so as to achieve the corresponding sealing performance.

Helium Mass Spectrometry Leak Detection In Aluminum Plate Fin Heat Exchanger Production

Roots Blower In Cement Plant

Vacuum Valve Installation 

high speed direct vane vacuum pump Introduction

high speed direct vane vacuum pump Introduction

High speed direct vane vacuum pump, referred to as direct pump. It is a new branch product of rotary vane vacuum pump. The main type is 2XZ high-speed direct vane vacuum pump.

The old rotary vane pump appeared earlier. It is a product with simple structure and wide application. However, the rotating speed of the old rotary vane pump is low, mostly around 400R / min. The belt drive is adopted to reduce the speed, so the volume is large and the weight is heavy. In order to make the pump body small and light, it can be seen from the calculation theory of the pump geometry pumping speed that when the pumping speed is fixed, the main means is to increase the pump speed. The key to improve the speed of vacuum pump is to make the parts directly bearing high speed load adapt to this working condition, that is, the material of pump body and rotor and the structure of rotor should adapt to the working condition after the speed is increased.

The direct vane pump adopts the motor to drive the pump rotor directly, and the speed is increased to more than 1400R / min. In this way, the structure of the pump is compact; the volume is significantly reduced; the weight is reduced; the pumping performance of the pump is improved; the vibration and noise are greatly reduced.

2XZ type direct coupled vacuum pump is a two-stage high-speed direct coupled rotary vane vacuum pump. This pump is the basic equipment used to extract gas from the sealed vessel to obtain vacuum. It can be used alone, and can also be used as the front pump and pre pump of various high vacuum systems.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

SK Vacuum Pumps Classification

It is believed that many customers are not very clear about the classification of SK vacuum pump, especially for those who choose SK vacuum pump, how to choose a suitable SK vacuum pump is very difficult. On-line search SK vacuum pump classification, there will be various types of pumps, but ultimately which is suitable for their own, customers are often unable to start. Today, I will give you a brief introduction to the SK vacuum pump category.

Generally speaking, SK vacuum pumps are divided into three categories: SK vacuum pumps with water, SK vacuum pumps with oil and SK vacuum pumps without oil.

1. SK vacuum pump for refueling is a rotary vane vacuum pump. The clearance between the rotary vane and the pump chamber is sealed by oil. The vacuum degree is much higher than that of water ring vacuum pump, but water vapor and corrosive gas can not be pumped.

2. Oil-free SK vacuum pumps are often used in clean environment, which will not pollute the products produced.

3. Water-added SK vacuum pump refers to water-ring vacuum pump, which uses water as working fluid and realizes suction, compression and exhaust by changing the volume of pump chamber, so as to achieve the purpose of vacuum extraction. This pump can extract gases containing water vapor and corrosiveness. Its types are cantilever water-ring vacuum pump, 2SK water-ring vacuum pump, SK water-ring vacuum pump, SZ water-ring vacuum pump, etc.

According to the introduction above, three different types of SK vacuum pumps have different working environments, so customers should have a good knowledge reserve and buy more suitable SK vacuum pumps when they choose and purchase.

2BV-Series-Oil-Ring-Vacuum-Pump

2BV6-Series-Explosion-proof-Water-Ring-Vacuum-Pump

2BV7-split-water-ring-vacuum-pump

SKB-Series-Direct-Water-Ring-Vacuum-Pump.html

Vacuum Pump in Coating Technology

In terms of coating technology, what are the application aspects of vacuum technology?

Vacuum technology plays a decisive role in many coating processes, such as vapor deposition of metals, plastics or glass. In many cases, these processes cannot be realized without vacuum. Generally, at the beginning of the process, a medium or high vacuum is applied to the chamber to exhaust the vacuum, then the reaction gas or gasified solid raw materials are extracted.

These coating processes have a common requirement: the chamber must be kept in a medium or high vacuum which fully meets the requirements of the coating process. These coating processes help to change the surface characteristics of the material, such as hardness or corrosion resistance. In addition, vacuum coating can also improve the adhesion or wettability of materials, or make the surface of materials maintain maximum hydrophobicity or hydrophilicity.

We provide a large number of vacuum solutions for different coating processes. In addition to independent vacuum pumps, we also supply a full set of vacuum systems. Single-stage rotary vane vacuum pump is especially suitable for coating process. Practice has proved that rotary vane vacuum pump combined with Roots vacuum pump is a standard solution for medium vacuum coating application. Various types of variable pitch screw vacuum pumps and Roots vacuum pumps can also be provided, so that the design of the vacuum system can fully meet the requirements of the coating process. If high vacuum is needed, we have turbomolecular vacuum pump and diffusion vacuum pump, which can be combined with the front pump to meet the coating process requirements.

Roots-Vacuum-Pump-of-pulp-equipment-for-paper-machine

High-Quality-Water-Ring-Vacuum-Pump-From-China

Vacuum-system-in-Distilled-Resin-Rosin-Production

High Vacuum Pumping Unit

Compared with the low vacuum unit, the high vacuum unit operates in the molecular flow state, which is characterized by low working pressure (10-2-10-6 pa), minimum exhaust and high pumping speed. The main pumps of the unit are usually diffusion pumps, diffusion booster pumps, molecular pumps, titanium sublimation pumps, cryogenic condensation pumps and so on. These pumps can not work directly on the atmosphere. Therefore, pre-pumps and front-stage pumps need to be equipped. Some high vacuum pumping units of diffusion pumps are equipped with front-stage maintenance pumps or gas storage masts to prevent pressure fluctuations and improve the performance of the unit.

(1) Pre-pumping. Pre-pumping (rough pumping) is mainly used to extract a large number of gases from the vacuum chamber, so that the gas pressure in the vacuum chamber can be reduced from atmospheric pressure to the vacuum degree when the main pump can start working. Therefore, the pressure of the pre-pumping is required to be less than the starting working pressure of the main pump. The pumping speed of the pre-pumping unit is determined by the rough pumping time. In order to improve the utilization rate of the vacuum unit, the pre-pumping unit is required to achieve a higher pumping speed. It can also be used as a front-stage pump. Vacuum valves are used to separate and switch between the two different functions.

(2) Maintenance pump. Due to the long start-up time of diffusion pump and oil booster pump, when loading and unloading in the vacuum chamber, the main pump is often closed in order to shorten the working cycle, so that the main pump is still in working state. Because the valve always has a very small amount of air leakage and surface bleeding, after a certain period of time, the pressure in the main pump chamber increases, which exceeds the maximum allowable pressure of the pump working yeast and causes the oxidation of the pump oil vapor. In order to solve this problem, one way is to use the front pump to continue pumping out the gas in the main pump, but at this time the gas discharged from the main pump is very small, there is a large horse cart of the front pump, which wastes energy. For this reason, another method can be adopted to stop the work of the front pump, close the valve of the front pipeline, and install a maintenance pump or gas storage inlay at the outlet of the main pump, so as to ensure that both the gas in the main pump can be discharged and the energy consumption can be saved. Gas storage tanks can not be made very different, they can only be used in small vacuum units with diffusion pumps as the main pumps, while maintenance pumps can be used in vacuum units with large main pumps.

(3) Gas storage tank. Small diffusion pump high vacuum pumping units are usually equipped with gas storage tanks, which are set between the diffusion pump and the front pump to store the gas discharged by the diffusion pump.

rotary-vane-vacuum-pump-in-water-pollution

Rotary-Vacuum-Pump-in-Power-Plant-Condenser

Vacuum-System-in-Food-Freeze-drying-Machine

Rotary-Vacuum-Pump-in-Coal-Smelting

2BV Water Ring Vacuum Pump Operation

As we all know, vacuum is used in many industries. 2BV water ring vacuum pump is a kind of equipment that can produce vacuum. In order to make the vacuum produced by pump applied in various fields, we must master its operating rules:

I. preparation

1. Start the working fluid supply pump and open the working fluid condenser valve.

2. Check whether the working fluid level is normal. If the liquid level is low, open the tap water valve to make up water.Roots-Vacuum-Pump-for-the-heavy-industry-and-waste-water-treatment

Two, operation

1. Start 2BV water ring vacuum pump and quickly open the intake valve.

2. Adjust the opening of the intake valve. If the noise of 2BV water ring vacuum pump is too loud, the intake valve should be closed down.

3. Slowly open the valve in the vacuum pipeline, and the production equipment can obtain the required vacuum.

4. Check every 30 minutes during operation. If abnormal sound or vibration is found, stop immediately and restart after troubleshooting.Roots-Vacuum-Pump-For-Transformer-Oil-Filtration-Machine

Three, shutdown

1. Close the vacuum tube valve.

2. Close the working fluid inlet valve and quickly close the 2BV water ring vacuum pump.

3. If there is no other water ring pump running, the working fluid supply pump and the working fluid cooler cold water valve should also be closed.

The operation of 2BV water ring vacuum pump has undergone preparatory work, operation, shutdown steps, opening the valve, adjusting parameters, and finally closing the valve after use, so that the pump can stop running and get a full rest.vacuum-furnace-product

How does the vacuum pump work?

With the demand for social work, vacuum pumps are being popularized and produced, and more and more people are using them. The understanding of it has gradually deepened, and there are many problems that they want to understand. Here is a brief introduction to the working principle of the vacuum pump.Mini-vacuum-pump-for-air-conditioner

  When the vacuum pump is running, due to the centrifugal force, the water forms a closed ring of approximately equal thickness depending on the shape of the pump chamber. The inner surface of the upper portion is just tangent to the impeller hub and the lower inner surface is just in contact with the tip of the blade. At this time, a crescent-shaped space is formed between the impeller hub and the water ring, and this space is divided by the impeller into a plurality of small cavities having the same number of blades. If the upper part of the impeller is 0°, the volume of the small cavity becomes smaller from 180° before the rotation, and it communicates with the suction port on the end face. At this time, the gas is sucked in, and when the inhalation is finished, the cavity is small. It is isolated from the suction port; when the impeller continues to rotate, the small cavity becomes larger and smaller, so that the gas is compressed; when the small cavity communicates with the exhaust port, the gas is discharged outside the vacuum pump.2SK-series-high-pressure-liquid-ring-vacuum-pump-for-oil-drilling

After reading the simple introduction above, I have a better understanding of it. I will understand that this is the case when I work, and it will work better in the future.diamond-vacuum-brazing-furnace

Rotary Vane Vacuum Pump Distributor

Rotary vane vacuum pump is a kind of vacuum pump equipment with compulsory oil prohibition. It solves the phenomena of oil return and injection before, and is recognized by the majority of users. This rotary vane vacuum pump has the following characteristics:


1. Fully sealed structure


It is the only rotary vane pump in the world that seals the motor in the oil tank. This structure will completely eliminate the possibility of shaft end leakage, and almost all rotary vane vacuum pumps in China have oil leakage problems.rotary-vacuum-pump-in-feeder


2. Air ballast valve with air cushion adjustment


Air cushion is an effective means of eliminating pump noise, and the function of adjustable air cushion is taken into account in the structure design of the air ballast valve of the pump. An independent system on the air ballast valve can adjust the air volume of the air cushion. In actual debugging, we obviously feel the importance of this structure for noise reduction.

3. The protection function of the pump is complete.

The pump itself is equipped with an exhaust stop valve, which is controlled by a solenoid valve, and the electric energy required by the solenoid valve is supplied by the generator with the motor. In this way, whether the motor moves or not determines whether the generator generates electricity and whether the solenoid valve operates or not. In addition, the pump also has an overload protection switch. Once the pump is stuck or overloaded, the motor current will rise abnormally. At this time, the protection switch will automatically cut off the power supply. From a usage point of view, this function is very useful.vacuum-pumps-in-beer-filling-machines


4. The pump has a wide range of applications.

Applicable to 50HZ, 60HZ and three-phase 220V, 380V power supply system. One of the reasons for the strong steam drainage capacity of the pump is that it can still maintain a high vacuum in the gas town. The other is that the oil temperature is high, and the oil temperature is above 80 C in normal operation. With such a high oil temperature and an effective gas town, the steam drainage capacity of the pump is greatly improved. In particular, it is worth mentioning that the pump can become a halogen-resistant vacuum pump as long as synthetic oil is selected.rotary-vane-vacuum-pump-distributor

rotary vane vacuum pump price

It is inevitable that the temperature of rotary vane vacuum pump will be too high in use. The main reasons that cause the cavity of rotary vane vacuum pump to exceed the limit temperature are as follows:rotary-vane-vacuum-pump-price

1. oil is too little.
2. Mechanical damage caused by serious contamination of pump oil;
3. Other mechanical damage;
4. Environmental temperature unacceptable to mechanical pumps.

Similarly, over-temperature will also cause flammable materials to expand the combustion range, thus forming a potential accident hazard. Therefore, the oil mark indication of vacuum pump should be checked routinely. The oil surface in the oil mark indication device is connected with the oil chamber of the pump. The oil mark indication should be observed carefully and supplemented in time when oil is found to be low. The mechanical damage caused by impurities in pump oil can be avoided by choosing suitable pump oil and using appropriate filtration system for different processes.rotary-vane-vacuum-pumps

What is a vacuum pump?

The use of pumps is very common nowadays. It can be said that almost every industry will use the product of pumps. Then, of course, according to the medium of transmission, the environment used and so on, the types of pumps are different. We often hear "vacuum pump" in water pumps. Many people want to know what a vacuum pump is. Then let's give a brief introduction.

Vacuum pump is a kind of revolving variable capacity. It needs the cooperation of the front pump to use in a wide pressure range with a larger pumping speed. It is insensitive to dust and steam contained in the extracted gas. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries.

Vacuum pumps include water ring pumps, reciprocating pumps, slide valve pumps, rotary vane pumps, Roots pumps and diffusion pumps, which have many characteristics.vacuum-pump-for-sugar-vapour-condenser

(1) There is a large pumping speed in a wide pressure range;

(2) The rotor has good geometric symmetry, so it has small vibration and smooth operation. There are clearances between the rotors and between the rotors and the housing. Without lubrication, the friction loss is small, which can greatly reduce the driving power and achieve higher speed.

(3) There is no need for oil seal and lubrication in the pump chamber, which can reduce the pollution of oil vapor to the vacuum system.

(4) There is no compression and exhaust valve in the pump chamber. Its structure is simple and compact, and it is insensitive to dust and water vapor in the exhausted gas.

(5) Compression ratio is low and the effect of hydrogen extraction is poor.

(6) The surface of the rotor is a curved cylindrical surface with complex shape, so it is difficult to process and inspect.what-is-rotary-vane-vacuum-pump

Roots Vacuum Pump Manufacturer

Roots vacuum pump first appeared in Germany in 1944. The invention injected a new impetus into German industry, promoted the economic development of German industry, provided a large number of excellent equipment for their domestic oil, chemical, pharmaceutical, papermaking, bio-fermentation, food, electronic metallurgy and other industries, and attracted great attention from other countries. Up to now, in the field of Roots vacuum pump, a group of senior manufacturers of Roots vacuum pump have emerged, integrating the domestic and foreign vacuum application design concepts and realizing the computerization of unit design. All drawings are optimized, and new products are continuously innovated and developed with excellent processing equipment.vacuum-pump-in-vacuum-grouting-process

As we all know, Roots vacuum pump and Roots blower are very close in structure and working principle. When it works, the suction port is connected with the main pump of the vacuum vessel or the vacuum system. Roots vacuum pump has many advantages: starting speed is faster than other vacuum equipment, energy consumption is less, pumping speed is larger than other vacuum equipment, efficiency is higher, and it is not sensitive to water vapor and dust contained in the pumped gas, which is very conducive to people's operation.the-contrast-between-dry-screw-vacuum-pump-and-rotary-piston-vacuum-pump

At present, Roots vacuum pump has been widely used in vacuum smelting, degassing, rolling, as well as chemical, food and pharmaceutical industries. Although there is a certain gap between domestic and foreign development level of Roots vacuum pump, there is a great development prospect in China's industry, because with the deepening of industrialization, the demand of Roots vacuum pump is constantly increasing and the future is boundless.roots-vacuum-pump-manufacturer-sales

water ring pump operation

Whether the water ring pump can be operated correctly is not only related to its service life, but also has an impact on its operation safety. In the process of equipment operation, it is essential to standardize the operation. The following is a summary of the operation rules of equipment shutdown:

1. When stopping the pump, it is necessary to close the valve on the injection line of the pump body, close the sealing liquid valve, shut down the motor, close the inlet and outlet valves of the pump, and confirm that the inlet and outlet valves of the pump are completely closed.rotary-vane-vacuum-pump-in-paper-industry

2. Isolation, emptying closes the inlet valve of the pump, closes the outlet valve of the pump, closes the supplement valve of the steam-water separator, confirms that the inlet and outlet valve of the pump closes and opens the exhaust valve of the steam-water separator. Open the pump body vent valve and confirm that the medium in the pump is clean.

3. Delivery and maintenance confirm that the inlet and outlet valves of the pumps are closed, that the pumps have been completely isolated from the system, that the pumps have been drained clean, that the drain condensation valves are opened, and that the motor is cut off. Get ready near the pump.vacuum pump manufacturer

4, in addition, equipment and auxiliary systems need to be inspected and maintained.
(1) check whether the pump has abnormal vibration or murmurs.
(2) check whether the bearing temperature is normal.
(3) check whether the leakage of packing seal meets the requirements.
(4) check whether the cooling water is normal.
(5) check whether the static seal is leaking.
(6) if there is any impurity in the liquid in the pump, after the pump is stopped, open the bottom of the pump and empty the water.
(7) the equipment needs to be replaced after 2000 hours of operation.

Vacuum systems used in auxiliary systems

Vacuum systems used in auxiliary systems of nuclear power plants are mainly vacuum purification, vacuum degassing and vacuum distillation. Vacuum purification is mainly used for the circulating purification of coolants in nuclear power plants. During the cooling process of primary water loop, oxygen, hydrogen, chlorine and other gases free from cooling water are removed, and then ion exchange purification is carried out. Vacuum degassing is used to remove fission gases in secondary coolants and vacuum the upper part of the liquid to make the water boil at room temperature. Vacuum distillation is used to treat wastewater containing tritium and separate tritium water and light water in vacuum.vacuum-pump-system-in-oil-and-gas-industry

In addition, the activated carbon adsorption method in vacuum process and the vacuum method in removing krypton 85 from waste gas of pressure reactor process are mostly used in the treatment of wastewater from boiling water reactor. In general, vacuum technology has been widely used in the three wastes treatment of nuclear power.

The working principle of the vacuum system is to start the system. The main vacuum pump group starts working until the vacuum degree in the vacuum tank reaches the set upper limit. The vacuum pump stops running automatically. The vacuum in the central vacuum system is maintained by the vacuum check valve on the pipeline automatically. If the vacuum in the vacuum tank decreases due to the working requirement and falls below the set lower limit, the standby vacuum pump set will start automatically. As a result, the vacuum degree of the vacuum system can maintain a stable vacuum source and meet the production requirements.

If you want to know more about our  vacuum pump products, or if you want to consult the Vacuum systems  please leave a message or send us an email at contact@evpvacuum.com

piston vacuum pump overhaul

For the maintenance of piston vacuum pump, it is generally necessary to disintegrate the pump thoroughly, check comprehensively, measure the clearance between the sliding valve and the pump body (normal clearance is 0.04-0.12 mm); check whether there are cracks on the surface of the eccentric wheel of the sliding valve and guide rail pump in the pump, replace them immediately; replace all the sealing parts in the pump dynamically; and measure the clearance between the sliding valve and the pump body (normal clearance is 0.04-0.12 mm). A vibration tester can be used to test the vibration of the pump every week.

According to the measured data, the wear condition of bearing, sliding valve and other components can be preliminarily determined. When the accuracy of bearing motion is reduced, it is replaced to avoid the impact and friction between sliding valve and pump chamber caused by the wear of bearing. Vacuum gauge is used to test the limit pressure of the repaired mechanical pump to determine its performance and repairing effect. For old pumps with long service time, the clearance of the pump is greater than 0.1 mm and less than 0.2 mm. The limit vacuum requirement is not very strict. Vacuum pump oil with 150 mm2/s kinematic viscosity can also be selected to meet the normal operation of the pump.

Because of the wear of pump chamber, the gap between slide valve and pump chamber is larger than 0.2mm. It needs to cooperate with the pump manufacturer. According to the wear condition of pump chamber, the slide valve, eccentric wheel and guide rail are specially made to keep normal gap with pump chamber. For the serious wear and scratch of pump chamber, the time of emptying and the limit pressure can not be used. If the cost of spare parts is close to half of the price of the new pump, the value of maintenance has been lost. A new piston vacuum pump should be replaced.


If you want to know more about our  vacuum pump products,  please leave a message or send us an email at contact@evpvacuum.com
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Oil-free vacuum pump

The oil-free vacuum pump is a mechanical vacuum pump that can operate without any oil lubrication. The utility model has the advantages of simple structure, easy operation, convenient maintenance and no pollution to the environment. The oil-free vacuum pump has good durability and is a vacuum, compression, dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.Rotary Vane Vacuum Pump

Compared with the oil pump, the oil-free vacuum pump has a low vacuum and a small pumping capacity, but is compact in size, easy to install, simple to maintain, easy to move, does not produce soot, and does not pollute the environment, especially in laboratories with higher requirements. It is also one of the most frequently equipped equipment in the laboratory.Dry vacuum pump

Therefore, when purchasing an oil-free vacuum pump, first determine the degree of vacuum required to work. If the demand is high, the vacuum pump selected should be higher than the required vacuum. Otherwise, the vacuum requirement will not be met. Go to work requirements. The second is the pumping rate of the oil-free vacuum pump, which is slightly larger than the required pumping rate during the selection, so that it can better meet the needs. Finally, see if the extracted gas is corrosive, corrosive gas will corrode the pump, and special materials must be used to meet the demand.Oil Diffusion Vacuum Pump 

Vacuum pump unit functional structure

Different vacuum systems require different degrees of vacuum. Therefore, it often needs to be completed by a set of vacuum pumps. That is, by working in series with vacuum pumps in different pressure ranges, the vacuum pump on the high vacuum side can reach the vacuum required by the system, while the vacuum pump on the low vacuum side is directly exhausted. Obviously, a relatively simple vacuum pump unit is a vacuum pump with direct discharge. But a high vacuum system usually needs three units, and a medium vacuum usually requires two units. A high vacuum pump and a low vacuum pump are difficult to form an effective high vacuum pump unit. But if a middle vacuum pump is connected between the high and low vacuum pumps, it can play the role of connecting the top and bottom, continuous flow, and each pump can work in the best state.

Vacuum pump is to pump out the gas in the vacuum vessel, but often the pump's air outlet can not be directly connected with the pumped vessel. Because of the technical needs or to reduce the pollution degree of the vacuum pump unit with oil vapor pollution, it is necessary to connect with the pumped vessel through the cold trap, valve, pipeline. The pipe diameter of vacuum pump unit is large, the resistance loss will be small under the condition of the same flow rate and small liquid velocity; if the pipe diameter is small, the resistance loss will be aggravated. Therefore, the intake pipe of vacuum pump unit should be equipped with a valve, which is used to regulate the amount of water intake, the amount of water intake has an impact on the degree of vacuum. When regulating the amount of water intake, the valve is controlled by checking the pointer of the vacuum meter.

The material selection and sealing of the pipes and valves above the inlet of the main pump of the vacuum pump unit should be especially careful. Stainless steel and metal sealing structure and sealing materials are generally used.Vacuum-unit-introduction

Water ring pump stop pump operating procedures

Whether the water ring pump can be operated correctly is not only related to its service life, but also has an impact on its operation safety. In order to standardize the operation of the equipment during the operation process, the operation after pump stopping is also very important.

1. When stopping the pump, it is necessary to close the valve on the injection line of the pump body, close the sealing fluid valve, stop the motor, close the pump inlet and outlet valve, and make sure that the pump inlet and outlet valve is completely closed.

2. Isolate, empty and close the inlet valve of the pump, close the outlet valve of the pump, close the replenishment valve of the steam-water separator, and confirm that the inlet and outlet valve of the pump closes and opens the exhaust valve of the steam-water separator. Open the pump body vent valve and confirm that the medium in the pump is clean.

3. Delivery inspection confirms that the pump inlet and outlet valve is closed, confirms that the pump has been completely isolated from the system, confirms that the pump has been drained clean, the drain valve opens the vent valve, confirms that the motor is powered off. Get ready near the pump.

4, in addition, equipment and auxiliary systems need to be inspected and maintained.
(1) check whether the pump has abnormal vibration or murmurs.
(2) check whether the bearing temperature is normal.
(3) check whether the leakage of packing seal meets the requirements.
(4) check whether the cooling water is normal.
(5) check whether the static seal is leaking.
(6) if there is any impurity in the liquid in the pump, after the pump is stopped, open the bottom of the pump and empty the water.
(7) the equipment needs to be replaced after 2000 hours of operation.

Molecular Vacuum Pump Price

SK water ring vacuum pump works

We need to be prepared before we do anything, so is the case with SK water ring vacuum pumps. Before you use it, you need to be well prepared to get twice the result with half the effort.

1. Before we use it, we should check the rotation of the pump shaft of SK water ring vacuum pump to see if it is normal, whether it is stuck or not, and whether the position of the impeller is normal.

2, SK water ring vacuum pump cable and cable plug whether there is rupture, scratching and breaking phenomenon.piston-vacuum-pump

3. In operation, we should pay attention to the change of the pump voltage, which is generally controlled within the range of (+5%) rated voltage.

4. The position of SK water ring vacuum pump in water is very important. It should be selected as far as possible in places with abundant water, no silt and good water quality. Vertical suspension in water is not allowed to be placed horizontally, so as to avoid falling into the mud or blocking the inlet of the pump by suspended solids, resulting in a sharp decrease in water output and even no water can be pumped.

Before we use SK water ring vacuum pump, we must have an understanding of the whole, while we are in production, to the machine first operation, testing, so that we can ensure that the use of the process to reduce abnormal phenomena.