water ring vacuum pump characteristics and development

A new type of 2be series water ring vacuum pump is designed. The pump body of this kind of water ring vacuum pump is non cylindrical. This shape is suitable for the flow of gas and liquid, so it can significantly improve the performance.

Under the same conditions, the air volume of 2be water ring vacuum pump can be increased by 10% (when dry air is sucked in), or 20% (when wet air is sucked in), and the energy consumption is also small. Anti cavitation holes are designed in the pump to avoid cavitation. The 2be water ring vacuum pump has been successfully developed through a large number of experiments, rather than based on the theoretical research results. 2be water ring vacuum pump has been ordered since 1981.

Vacuum pump was first used in the heating system of New York, and then it was used in papermaking and other industrial sectors. After 1915, it was gradually widely used in industry.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

industrial vacuum pumps,vacuum furnaces

Common vacuum units in vacuum furnace plant

Vacuum equipment professional factory provides complete vacuum equipment for vacuum electric furnace and other equipment. In addition to providing a complete set of vacuum acquisition equipment, some of them also have measurement and control vacuum instruments, which can be directly connected to the furnace body.

There are many kinds of vacuum units in China, all of which are JK series. Now, they are produced by Beijing Instrument Factory and Lanzhou vacuum equipment factory

In addition to the above-mentioned units, there are also oil booster pump and roots pump unit which are widely used in vacuum heat treatment furnace.

Roots Vacuum Pump In Sterilization Equipment

Water Ring Pump

Water Ring Vacuum Pump

Material requirements for vacuum system

The materials used in vacuum pump system mainly refer to vacuum pipeline system, valves and sealing materials, etc. the materials of vacuum pipeline system include metal, rubber and glass, which have their own characteristics, and which one to use depends on the specific situation. The connection between pipeline and vacuum components can adopt welding, welding, flange plate connection, etc. the valves in the system are divided into metal valve and glass vacuum valve Species. The commonly used sealing materials in vacuum system are vacuum sealing oil, vacuum sealing wax, vacuum sealing mud, vacuum paint and epoxy resin

In the vacuum system with oil diffusion pump, in order to prevent oil vapor from entering the pumped system, baffles or cold traps are often used to block oil vapor. Dry ice or liquid nitrogen can be placed in the cold trap to condense and absorb the oil vapor in the system, and the vacuum degree can be further improved.

Vacuum Pump For Chemical Material Dry Room

Vacuum Pump For Dry System

Double Stage Water Ring Vacuum Pump In Oil Refining

How to reduce the suction gas temperature of vacuum pump

One of the important sources of heat of sealing water in vacuum pump is the air-water vapor mixture drawn from the condenser. Reducing the temperature of the mixture can not only reduce the heat entering the vacuum pump, but also with the decrease of the temperature, the water vapor will condense into water, the partial pressure of steam will decrease, and the partial pressure ratio of air will increase, so the air concentration entering the vacuum pump will increase The effective suction capacity of vacuum pump is improved.

At present, the widely used method is to introduce the desalted water or cooled condensate into the air extraction pipe cooler at the inlet of the vacuum pump. The steam condensate in the mixed gas is mixed with the injected desuperheating water and recycled. The non condensed air is extracted by the vacuum pump. This method has the characteristics of simple layout, less investment, no rotating equipment and maintenance free, so it is the most economical and reliable method.

Best Water Ring Vacuum Pump

What is water ring vacuum pump

industrial vacuum pumps,vacuum furnaces

Sealing of overflow valve of slide valve vacuum pump

The sealing degree of the exhaust valve directly affects the problem that the gas in the oil tank slightly higher than atmospheric pressure flows back to the pump cavity. If the valve is not closed tightly, it will seriously affect the vacuum degree of the vacuum pump. The main reason for the loose closing is that the valve plate is deformed, cracked, or the valve plate is not guided properly when it is bouncing, which causes the valve plate to stay.

If the exhaust valve is not closed in time, the vacuum degree of the pump will also be affected. For example, in order to reduce the power consumption and noise in high vacuum, when the composite exhaust valve combining the compression valve and the floating valve is used, the single-stage pump will not have problems generally. When the double-stage pump is used, because the pressure difference between the low true cavity and the oil tank is relatively small, especially when the rotating speed is high, the floating valve will not appear The phenomenon of timely closing affects the vacuum degree of the slide valve vacuum pump. If floating valve is used in the overflow valve of high true cavity of two-stage pump, the problem will be more prominent because the pressure difference between two sides is smaller.

The spring force of exhaust valve can be smaller on the premise of ensuring the valve tightness. If the pressing force is too large, the power consumption will be increased. In the past, the compression force of some imitated pump springs was up to 1.2x105pa. Through our repeated tests, it was found that 1.02 ~ 1.1x105pa was suitable, which not only reduced the power consumption, but also reduced the noise.

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Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

How to choose vacuum pump in brick and tile factory

No matter what kind of vacuum pump it is, there are two main indexes that affect its performance: limit vacuum degree and pumping rate. No matter what type of vacuum extruder, its limit vacuum degree is less than - 0.092mpa. In practice, the limit vacuum degree required by most vacuum extruders is about - 0.08mpa, so many vacuum pumps are not difficult to achieve this index. The limit vacuum degree of vacuum pump is easy to check. As long as the stop valve on the pipeline is closed before starting the vacuum extruder, the limit vacuum degree can be displayed by starting the vacuum pump alone.

Generally, vacuum pump manufacturers have inspection records of this index. But there are also poor quality vacuum pumps. When they come to the brick and tile factory for test run, their ultimate vacuum degree is only below - 0.07MPa. The pumping rate of vacuum pump is very important. It plays an important role in the vacuum degree of vacuum extruder. After many vacuum extruders are used for a period of time, the vacuum degree gradually decreases, which is caused by the too small pumping rate of vacuum pump.

A large number of vacuum pump manufacturers do not have the pumping rate detection device of vacuum pump, and do not test this important performance at all. Some new vacuum pump manufacturers do not have the pumping rate detection device of vacuum pump, and do not test this important performance at all. Some new vacuum pump manufacturers do not have the pumping rate detection device of vacuum pump, and their pumping rate can only meet the corresponding requirements at the limit vacuum degree of - 0.08mpa 1 / 5 of them, some even lower, and some vacuum pump factory's instructions not only do not have the working characteristic diagram of the vacuum pump, but also do not have the data of the pumping rate of the vacuum pump, so the quality of this vacuum pump is not guaranteed. When choosing the right vacuum pump, we must examine the two main working indexes of the vacuum pump, which are the limit vacuum degree and the pumping rate, in order to ensure that the vacuum extruder has a stable vacuum degree.

Vacuum Pump In Small Clay Extruder Machine

Vacuum Pump In Autoclaveable

Piston Vacuum Pump For Water Intake In Air

Types of vacuum pumps commonly used in salt industry

Since the 1950s, China's salt industry has undergone significant changes, the output is second only to the United States and the Soviet Union. Most salt production processes use multi effect evaporation to increase the effective temperature difference to improve the output, save energy and reduce consumption, while the first effect low-pressure steam pressure and temperature are basically stable, and the improvement space is limited, so we try to improve the final effect vacuum degree to achieve the purpose.

So how to improve the vacuum degree in salt making process? What type of vacuum pump should be selected to meet the needs of salt production process? This paper gives a detailed explanation of this problem


Model and main features of vacuum pump

There are many types of vacuum pumps, such as water ring vacuum pump, roots vacuum pump, reciprocating vacuum pump and steam jet vacuum pump. Its main features are as follows:

(1) Water ring vacuum pump - this pump can be used alone to extract water vapor or corrosive gas, but in the salt industry, the ability to discharge non condensable gas is limited, and the vacuum effect is general when the exhaust volume is not enough;

(2) Roots vacuum pump - this kind of pump is generally not used alone, and is often used in series with water ring vacuum pump as a vacuum unit. It has the advantages of high vacuum degree, does not consume medium pressure steam, and has better ability to discharge non condensable gas. However, after serious corrosion of rotor and impeller, the effect is poor, maintenance is difficult, and anti-corrosion materials should be selected during selection;

(3) Reciprocating vacuum pump - the biggest disadvantage is that there are many vulnerable parts, piston ring vulnerable and poor sealing;

(4) Steam jet vacuum pump is widely used by salt manufacturers, with good and stable vacuum effect and few maintenance, but the effect of foreign steam jet pump is better than that of domestic one.

Best Water Ring Vacuum Pump

What is water ring vacuum pump

Dry vacuum pump

Sealing problem of vacuum pump

Due to the particularity of dry gas medium, it is required to seal the vacuum pump to ensure that the dry gas can neither leak out nor leak in. In terms of the current expansion ring sealing form, it is difficult to meet this requirement.

Now, due to the introduction of nitrogen, the nitrogen pressure is always kept at 0.02MPa, while the pressure in the vacuum pump fluctuates between - 0.08 ~ 0.02MPa, such a part of nitrogen

The leakage into the pump is mixed with the medium, which not only consumes nitrogen, but also affects the quality of raw materials. At the same time, the lubricating oil in the oil tank is also sucked into the air cavity with nitrogen, It increases the consumption of lubricating oil, and the oil filling hole needs to be sealed well during the operation of pump, which brings inconvenience to daily maintenance. Therefore, the fundamental method to solve the leakage of seal lies in improving the reliability of seal itself, and the oil filling method also needs to be improved.

Vacuum Pump In Vacuum Treatment Of Power Transformer

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Maintenance technology of vacuum pump

Maintenance technology of vacuum pump

In view of the working conditions of dust and acid gas when the vacuum pump works, and the vacuum pump works continuously for a long time, the technical personnel of the vacuum pump factory put forward several suggestions on the maintenance process of the vacuum pump:

1. A metal filter screen is arranged at the air inlet of the vacuum pump;

2. For the maintenance of the vacuum pump, take two weeks as a cycle to clean the sediment in the oil tank, forcibly replace the vacuum pump oil, clean the metal filter screen, check and replace the damaged valve plate and spring.

3. In the selection of vacuum pump oil, mineral oil with low saturation pressure and kinematic viscosity of 100mm2 / s should be selected, which has the characteristics of low price (for titanium smelting, it is not economical to select synthetic vacuum pump oil);

4. During the cooling period of ingot or idle time of production, the production team is required to open the gas ballast valve, pump the gas for about 1H, and discharge the water in the pump oil out of the pump as much as possible; by frequently changing the pump oil, keep the pump cavity clean, ensure the reasonable viscosity of the pump oil, maintain its sealing performance, and reduce the scratch of hard particles on the pump cavity;

5. By removing the water in the oil, reducing the formation of hydrochloric acid, and delaying the corrosion of hydrochloric acid to the components in the pump cavity.

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Vacuum Pump Vacuum Drying

Control of liquid seal in water ring of vacuum pump

The vacuum pumping of vacuum pump mainly depends on the water ring liquid seal in the pump body. The level of water ring liquid seal determines the pumping rate and vacuum degree of the pump. In the early stage, the liquid seal of water ring is of direct discharge mode, which has problems in process control, economic operation and environmental protection.

① In order to prevent scaling of equipment and pipelines, industrial water shall not be used during the suction of C02 gas. In addition, some enterprises have acid corrosion and Cl corrosion in their vacuum pump operation system, so the pump body is lined with stainless steel and desalted water is used in selection.


② In addition, the maximum working fluid volume of 12 vacuum pumps is 155m3 / h when they are operating at the same time. Considering economic operation and environmental protection, the working fluid must be recycled. How to ensure the circulation and control of working fluid? Through demonstration, a feasible scheme is finally determined, that is, four vacuum pumps are used for the first time to share one gas-water separator. By adjusting the liquid level of the gas-water separator, the water ring liquid seal level of the vacuum pump is controlled, and the effect is good after being put into use.

As a physical adsorption decarbonization process, PSA has obvious energy saving and emission reduction effect, but it also has the problem of effective gas yield. How to ensure a more optimized yield and a more stable process operation needs to be summarized, improved, optimized and improved in the future production operation to create better economic benefits for enterprises.

What is water ring vacuum pump

Liquid Ring Vacuum Pump


liquid ring comprssor

Waste oil treatment of vacuum system

Waste oil treatment of vacuum system

The silicothermic magnesium smelting process is the reduction process of MgO · Cao by Si under the condition of high temperature and high vacuum. The front pump of the main pump used in vacuum engineering is h-slide pump, and the slide pump is oil pump, usually kk-1 × vacuum pump oil. In the reduction process, the dust, water or water vapor in the pellet will enter the pump cavity to make the vacuum pump oil emulsified. The emulsified pump oil will destroy the seal of the pump and make the vacuum degree of the system not reach the rated vacuum degree, that is to say, the effect of the h-slide valve pump depends on the quality of the vacuum pump oil.


In the process of pumping, it mainly depends on the high viscosity of vacuum pump oil, which is not easy to compress and plays the role of sealing, lubrication and cooling in the pump. However, when the dust and water (or steam) in the pellet are sucked into the vacuum pump cavity, the vacuum pump oil is quickly emulsified, dirty and deteriorated, which makes the vacuum pump unable to play its effect. The vacuum degree of the system immediately drops, which affects the rate of reduction reaction and the quality and production of magnesium. In order not to affect the quality and production of crude magnesium during reduction, the oil has to be changed. The polluted waste oil (according to The actual consumption per ton of magnesium vacuum pump oil is 50kg) if it is not treated and reused, the production cost of magnesium will be affected.

Vacuum Pump Unit In Power Plant

Water Ring Pump

Water Ring Vacuum Pump manufacturers

Select the right vacuum pump for the silicon device

In a petrochemical company's silicone device, four vacuum pumps of our company have been used in October 1999 for more than five years, and no major failures have occurred. Each year's major maintenance is just inspection; when using water ring pumps produced elsewhere, in some cases, the vacuum degree is insufficient, or the pump shaft is overheated and the vacuum degree is reduced, so it must be switched and repaired frequently to make chemical production When fluctuations occur, the goal of balanced and stable chemical production cannot be achieved, causing difficulties in production.


So how to make the correct selection of vacuum pump?

First of all, calculate the displacement according to the gas density of the material and the weight of the exhaust gas, and then convert it into gas volume and fill in the form one by one. Our technical experts will give the specific model of the water ring vacuum pump. In order to ensure that the production conditions can be met, the working conditions of the process need to be clearly stated. On the organosilicon hydrolysate cracking device, there is a problem. The hydrolysate contains D3, although its content is not much. However, its physical properties are relatively special. It crystallizes at 78 ° C and blocks the pipeline. At that time, it was discussed with its senior professional technicians when selecting the type. Whether such crystals can affect the performance of the water ring vacuum pump and cause malfunctions. However, after actual use, no abnormal phenomenon has occurred, and the effect is very good.

Vacuum Pump For Toxic Gas

Vacuum Pump In Resin Industry

Why Does Vacuum Pump Corrosion

Common types of vacuum pumps in vacuum distillation

Common types of vacuum pumps in vacuum distillation

For the refining process of liquid products, the last step is often distillation. The main purposes are: to maintain the physical and chemical properties of the product; the refining yield of the product is as high as possible; taking the product as the positive fraction, to remove the low boiling part as the solvent and the high boiling part of the waste material, so as to achieve the product quality index. Liquid products usually have the heat sensitivity of thermal deterioration, so it is very important to achieve refining at a lower temperature.

Similarly, from the consideration of economy and environmental protection, the removed solvent must be recycled. The refining of liquid products is required to be carried out under high vacuum as much as possible, and the normal operating pressure is below 10Pa (one standard atmospheric pressure is 101325pa). There are two kinds of single pumps, slide valve vacuum pump and claw pump, and roots vacuum unit.

(1) Roots vacuum unit.

Its operating power is quite high. For the unit with the same pumping capacity of the front stage pump as the lh-70ph claw pump, the unit power is 20kW. For the vacuum generating device running continuously day and night, the difference of 12.5KW means the difference of electricity cost of 90000 yuan (calculated by 300 working days and nights every year) after one year. 1 yuan / kWh).

(2) Spool pump.

It must have a vacuum pump to work effectively. When the gas flows through the vacuum pump, it is inevitable that the vacuum pump oil will be entrained out. This means that the recovered solvent cannot be applied directly, or the environment can be wasted and polluted. In addition, the slide valve pump requires high operation and maintenance. In the cold season, if the switch is a little careless, it is very easy to damage.

(3) Claw pump.

Using claw pump, there is no problem in recovering solvent under normal pressure after pump. In addition, due to its good structure, excellent processing and complete accessories, once put into use, it has low requirements, wide range of use, long service life and convenient cleaning and maintenance. When a higher vacuum is needed, it can be used as a front stage pump to form a vacuum unit conveniently.

It can be seen that in the case of high vacuum refining of liquid products, claw pump is a quite reasonable option.


Professional Liquid Ring Vacuum Pump Manufacturer

Liquid Ring Vacuum Pump And Pump Set

Water Ring Pump

What is the discharge pressure of vacuum pump

What is the discharge pressure of vacuum pump?

When the vacuum pump is working, it will continuously exhaust the air from the pump body to form the vacuum degree required by the work at the suction port, that is to say, the exhaust pressure is another main factor affecting the operation efficiency of the water ring vacuum pump.

The exhaust pressure will have a huge impact on the suction capacity and the power consumption of the shaft operation of the vacuum pump. When the vacuum pump system is running, if its exhaust pressure is greater, the suction capacity of the vacuum pump will be smaller, and the power consumption of the corresponding shaft operation will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of the vacuum pump will be larger, and the power consumption of the corresponding shaft operation will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of the vacuum pump system should be observed in real time. In case of abnormal exhaust pressure data, corresponding measures should be taken immediately to update and reconstruct the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the range of national standards or recommended by the manufacturer for a long time, and the vacuum pump can always be in the optimal working condition Effectively improve the overall operation mechanical efficiency of water ring vacuum pump.

Roots Vacuum Pump In Naphthol Distillation

Vacuum Pump Pumping Test

Vacuum Pump Maintenance

Under what conditions should vacuum pump be used best

Under what conditions should vacuum pump be used best?

Many users don't understand the use conditions of vacuum pump, which often causes the damage of vacuum pump, so under what conditions is the best use of vacuum pump? According to the basic needs of users and their own experience, the technicians of vacuum pump factory summarized the following points, hoping to help you.

(1) The selection of vacuum pump should be based on the user's specific process, such as the vacuum degree, the pumping rate, the selection of power supply voltage, etc.

(2) The vacuum pump should be cleaned and changed regularly. Especially for the rotary vane vacuum pump, kerosene or straight run gasoline shall be used for cleaning. After cleaning, all parts shall be dried, air dried or blown with a blower. When changing oil, 100 × or 1 × clean vacuum pump oil shall be selected. If other oil is used instead, the vacuum degree will be seriously affected, the vacuum pump shall be placed in a clean and dry place.

(3) The connection pipeline between vacuum pump and user system shall be mainly short and thick, and elbows shall be minimized. If there are elbows, all joints shall be strictly sealed to ensure no air leakage.

(4) The temperature of the gas pumped by the vacuum pump is also limited. If the temperature of the gas pumped by the water ring vacuum pump is higher than 40 ℃, a gas cooling device shall be added. If there is liquid drop, condensation dehumidification device shall be added. If the pumped gas has corrosiveness or chemical reaction with oil, the material of vacuum pump shall be selected.

(5) Before starting the pump, check whether the rotation direction of the motor is correct (when checking the direction, take off the drive belt first to avoid oil gushing out when the motor reverses). The inspection methods of the rotary vane vacuum pump and the water ring vacuum pump are different, and check whether the lubrication system is reliable and the oil quantity is appropriate.

（6） The oil temperature of vacuum pump in operation shall not exceed 75 ℃, and there shall not be too much noise and vibration, otherwise it shall be shut down for maintenance.

(7) When stopping the pump, the valve connecting the vacuum system shall be closed first, and the vent valve shall be opened to prevent the pump oil from being sucked back into the vacuum system, and then the power supply of the motor shall be cut off.

To sum up, the service life of the vacuum pump is not only related to the quality of the vacuum pump itself, but also requires the user to use it in strict accordance with the requirements of our factory. It is not allowed to dismantle or operate the pump without permission under unclear conditions.

Vacuum Pump Commonly Used In Papermaking Industry

Corrosion Resistant Water Ring Vacuum Pump Installation

Vacuum Sucker Vacuum Pump Types

Vacuum pumps in the industrial sector

Vacuum pumps in the industrial sector

Vacuum pumps are widely used in industrial sectors, such as light bulb manufacturing, electronic tubes, food packaging, and semiconductor device manufacturing. Vacuum distillation, vacuum impregnation, ion nitriding, vacuum drying, vacuum carburizing, vacuum quenching, vacuum casting, etc. Under vacuum conditions, due to the small number of gas molecules, the harmful effects of gas can be avoided.

For example, heat treatment in vacuum can prevent oxidation and gas from penetrating into the metallographic structure, thereby improving the quality of parts; maintaining high vacuum in electronic devices can avoid the impact of electronic movement; maintaining high vacuum in vacuum packaging can improve the shelf life of food. In modern cutting-edge science and technology, vacuum technology is an indispensable means, such as high-energy accelerators, controlled thermonuclear reactions, universe simulation and other projects all require high vacuum or ultra-high vacuum technology.

There are many types of vacuum pumps, including mechanical vacuum pumps (such as reciprocating vacuum pumps, oil-sealed mechanical vacuum pumps, roots vacuum pumps, turbo molecular pumps, water ring vacuum pumps, etc.), jet vacuum pumps (such as water vapor jet pumps, water jet pumps, atmospheric jet pumps, Oil booster pumps, oil diffusion pumps, etc.), as well as physicochemical adsorption pumps (such as titanium pumps, molecular sieve adsorption pumps, cryogenic pumps, etc.). Mechanical vacuum pumps are mainly used in the machinery industry sector, and other types of pumps are less commonly used.


Piston Vacuum Pump Research Noise

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Water Ring Vacuum Pump manufacturers

Vacuum pump in lithium bromide hot and cold water unit

Vacuum pump in lithium bromide hot and cold water unit

1. Strong drainage steam capacity

Due to the special working conditions of lithium bromide hot and cold water units, the vacuum pump must have a high drainage steam capacity. Our 2XZ rotary vane vacuum pump has a high pump temperature and a complete gas ballast device, which makes the pump have a higher drainage steam capacity. .

2.Reliable anti-return oil safety valve

This valve plays a vital role for this pump. Direct-connected pumps from other domestic manufacturers (even Japan) do not have this device. In order to prevent oil return, an additional electromagnetic bleed-off valve is required. Since the valve plate is directly pulled by the electromagnetic force against the spring force, the current is large and the reliability is poor.

3. Easy maintenance

The high and low vacuum stages of the vacuum pump can be separated separately, positioned by positioning pins, and can be easily disassembled, cleaned and cleaned according to the instructions of the manual. In addition, we have also made some adjustments to this vacuum pump based on the application of lithium bromide refrigeration for two years to make it more suitable for this application.

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Vacuum Pump For Sealing Materials Requirements

Vacuum Pump Use Details

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Research and Improvement of Rotor Blade Vacuum Pump Stator Profile

Rotary vane vacuum pump is a kind of small volume, light weight, low noise, convenient starting, low cost among many vacuum equipment. It can be used alone or in combination with other vacuum equipment. It is used as the foreline pump of the Roots rotary vane vacuum unit. It is widely used in laboratories, metallurgy, machinery, printing, electronics, chemicals, light industry, petroleum and medicine field.

The traditional rotary vane vacuum pump eccentrically places a rotor in the circular stator cavity. When the rotor rotates, due to the eccentric action, the rotary vane on the rotor slides against the inner curved surface of the stator under the action of centrifugal and spring forces to achieve volume change. Complete the suction and exhaust process. This causes greater friction and abrasion between the rotary vane and the pump cavity, which causes the temperature of the high-speed rotary vane pump to increase, which reduces the mechanical efficiency and working life of the rotary vane pump.

Aiming at the above disadvantages of the traditional rotary vane vacuum pump, a new type of rotary vane vacuum pump with a stator profile is proposed. The traditional rotary vane and spring structure is replaced with a through rotor. The entire rotor is placed in the rotor slot above the rotor, and both ends of the rotor contact the inner surface of the stator at the same time. When the rotor rotates, the rotating blade is driven to move, and both ends of the rotating blade always slide along the inner wall of the stator. Since the movement of the rotor is always constrained by the inner wall of the stator, the stator internal profile (also known as the pump cavity profile, hereinafter referred to as the stator profile) is a profile generated based on the rotor's movement mechanism.

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What are the types of water ring vacuum pumps

What are the types of water ring vacuum pumps?

The water ring vacuum pumps in use are single-stage, multi-stage and single-stage series-connected ejector tandem water-ring vacuum pumps. The two-stage water ring vacuum pump has a higher ultimate vacuum than the single-stage water ring vacuum pump, and the suction volume curve drops more flatly, which is suitable for working situations where higher suction volume is still required under higher vacuum.

The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jets. The two-stage water ring vacuum pump is a two-stage impeller connected in series on the same shaft, and the main shaft is directly connected to the driving device. The two-stage water ring vacuum pump used in the condenser of the power station has two operating modes when evacuating: the starting condition at low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2Pa, which can be Stage operation; under normal operating conditions under high vacuum, the absolute pressure of the condenser is 5999.4Pa, which can be operated in two stages.

The tandem vacuum pump used in the power station is to connect an ejector to the inlet of the water ring vacuum pump to increase the suction vacuum. The atmosphere is used as the working medium and is ejected from the nozzle at a high speed. The ejected gas is drawn out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, it is discharged to the gas and water separation tank.

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Best Water Ring Vacuum Pump

Application examples of vacuum systems

Application examples of vacuum systems


The vacuum system of the equipment includes 30 vacuum pumps, 50 vacuum valves, 10 anti-oil return baffles (cold traps), a total vacuum pipe length of 500m, and a total power of 740kw. The total water consumption is 65t / h, and the compressed air flow is standard. The maximum is 2.5m3 / min.

In order to simplify the system, reduce floor space, reduce investment and operating costs, the high vacuum unit borrows the booster stage pump and foreline pump of the medium vacuum unit, and the low vacuum unit borrows the booster stage pump of the medium vacuum unit. The on-off of the gas path during the process is controlled by valves to meet the requirements of each unit.

(1) High vacuum system configuration

The ultimate pressure of the equipment is three orders of magnitude lower than the working pressure. It is necessary to solve the problem of parallel connection of medium and high vacuum units. According to calculations, two sets of JK-1200 high vacuum oil diffusion pump + roots pump + slide valve pump are used. Evacuation unit. The ultimate pressure of the unit is 1.4 × 10-4Pa, and the extraction rate is 21000L / S.

(2) Medium vacuum system configuration

The configuration of this system must meet the requirements for the displacement under working pressure. If the cabin pressure is less than 2 Pa when the rocket is ignited, the test results will be inaccurate.

(3) Low vacuum system configuration

Because a large amount of condensable gas generated during the ignition of the rocket engine is captured by the heat sink and deposited in the form of frost in the cabin, and cannot be removed by manual methods, a low vacuum system is specially configured to achieve the slow sublimation of the condensable gas and discharge it. Outside the cabin.

The system uses two sets of double roots pump + water ring pump three-stage evacuation unit to increase the vacuum degree of the unit and make it reach the pressure required for the sublimation of condensable substances. The unit's ultimate pressure is 1 × 10-1Pa, and the air extraction rate is 1200L / s.

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Vacuum Pump Quality


Vacuum Degree Of Vacuum Pump

Contamination and treatment of rotary vane vacuum pump

Contamination and treatment of rotary vane vacuum pump


During the use of rotary vane vacuum pumps, particulate matter and vapors or liquids constitute unpleasant contamination.

Due to the inherent self-compensating clearance adjustment effect of the pump mechanism, it is not particularly sensitive to small mechanism damage. In most designs, plain bearings are selected to be less sensitive to dust than ball bearings. Once the dust particles are separated from the oil due to gravity, a sediment is generated in the oil pool, and it does not participate in the oil cycle until it is removed. These dust particles can be filtered with an oil filter, but it does not seem to be worth it. If the pollution is serious and the filter replacement is too complicated, it is not as easy as changing the oil. It is best to keep dust particles in a place where they can be handled before they enter the pump. For this, the use of dry filters and oily traps is most effective. The protection method chosen should depend on the volume being processed, the size of the dust particles, and the allowable pressure drop. In the case of abrasive dust particles, the surface hardness of the pump parts should be increased to extend the service life.

Substances exposed to low vapor pressure are not uncommon. These substances are condensed in the pump and mixed with the lubricant, or the lubricant is diluted, or paint-like and gel-like deposits are formed. The gas ballast method can do nothing about this. The best way is to block this vapor before it reaches the pump. However, in many cases, this is not appropriate, because the pump works in such a wide pressure range, it is difficult to design an effective trap, or due to certain pollutants, the maintenance of the trap becomes difficult. At this time, most of them are solved by regular oil change.

Corrosive pollutants can be controlled, especially when their amounts are small. Lubricants can act as a buffer between most metal surfaces and corrosives. In addition, if water condensation can be prevented, its corrosive hazards become quite limited. The use of dry gas isolation can effectively prevent atmospheric condensation in the separator. Maintaining a slightly high-pressure dry gas in the separator can prevent the influence of the humidity of the surrounding slope on the pump oil.

Soluble vapor refers to those substances that are difficult to be treated by gas ballasting, which are dissolved in oil and can be released again at the inlet side of the pump. In this case, it is best to use a two-stage pump. Atmospheric oil viscosity should be maintained to the extent that it can work. Oil regenerated with a foreline pump that is not sensitive to pollution or oil purified by vacuum distillation can work well.

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Vacuum pumps in the chemical industry

Vacuum pumps in the chemical industry

In petroleum and chemical production, certain production processes are often carried out under atmospheric pressure. Any pressure lower than atmospheric pressure is called vacuum, and the degree of vacuum commonly used indicates the degree of lower than atmospheric pressure. The machine used to pump gas from equipment below atmospheric pressure is called a vacuum pump. Vacuum pumps are used in the petroleum industry for vacuum distillation, degreasing of lubricants, furfural recovery, etc. In the chemical industry, vacuum pumps are used for vacuum filtration, evaporation, concentration, drying, and crystallization of solutions. Vacuum pumps can also be used as large centrifugal pumps for drainage irrigation pumps.

Mechanical vacuum pumps can be classified into reciprocating type, rotary type (skateboard type), and water ring type according to their structural types.

Any vacuum pump generally uses the following two main parameters to indicate its working performance

(1) Air extraction rate refers to the volume of gas that the vacuum pump draws from the intake pipe under the residual pressure per unit time, that is, the production capacity of the vacuum pump (or called the worldly V), expressed in m³ or L / s.

(2) Residual pressure or ultimate vacuum refers to the lowest pressure (absolute) that the pump can reach.

A certain vacuum pump is used to suck the gas in a closed container. No matter how long the suction time is, the pressure in the container cannot be reduced to zero (that is, absolute vacuum) indefinitely. This is because when the inlet pressure is lower than a certain value, either because the liquid in the pump vaporizes, or because the air disc leaked from the high-pressure side is the same as the vacuum pump's pumping victory. , The volume coefficient is reduced to zero. Both will make the pump unable to continue to inhale fresh gas. In this case, the pressure in the container will never decrease again. The absolute pressure at this time is called the residual pressure or the ultimate vacuum.

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Vacuum Pump in Concentrator Application

Vacuum Pump in Concentrator Application

The vacuum filter and large water pump (before start-up) of the concentrator need to use the vacuum pump to extract the air.

A vacuum pump is a compressor that sucks out gas from thin air spaces and exhausts it to the atmosphere. Generally, the pressure of the gas it sucks is lower than the atmospheric pressure (recently manufactured vacuum pumps can make the residual pressure in the container as large as 1 × 10-15 mm silver column), and the pressure of the exhaust gas is slightly higher than atmospheric pressure.

Vacuum pumps are also distinguished by reciprocating and rotating types, and their working principles are the same as those described above. There are two types of vacuum pumps used in ore dressing plants: wet and dry.

Dry-type vacuum pumps only suck air from a certain space (such as air in a filter), which can evacuate 98%; while wet-type vacuum pumps suck out liquid and air together and can only evacuate 85%.

In order to maintain a certain volume of the water ring and remove heat, water must be continuously circulated. In order to supply water to the vacuum pump, a special water tank is connected to the discharge pipe, and a gate valve on the tank is used to adjust the circulating water volume. The used water is placed in the box with the air. In order to avoid blade end surface abrasion, there should be no inclusions in the circulating water, otherwise the blade will be abraded, and the air extraction volume will decrease as the wear increases; the general wear should not be greater than 0.1 mm.

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Ultra-high vacuum extraction unit

Ultra-high vacuum extraction unit


The ultra-high vacuum unit works in the ultra-high vacuum pressure range of 10-6-10-10Pa.

Low, low leakage rate, can withstand high temperature baking at 200 ~ 450 ℃, the requirements for the unit are:

(1) The ultimate vacuum of the main pump should be high, at least above 10-7 ~ 10-8Pa;

(2) The main pump has a certain pumping speed within the working pressure range of the ultra-high vacuum;

(3) The main pump of the unit or above the air inlet of the main pump can withstand high temperature baking at 200-450 ℃;

(4) The partial pressure of the return gas from the main pump (including the working fluid vapor and the analytical gas) must be sufficiently low.

(5) The main pump with strong selectivity of the pumped gas should be equipped with a sufficiently large auxiliary pump;

(6) For the pipes, valves and other components above the air intake of the main pump of the unit, the selection and sealing of materials must be especially careful. Generally, stainless steel with low outgassing rate and metal sealing material are used to resist high temperature baking.

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Determination of vacuum exhaust volume of vacuum pump

Determination of vacuum exhaust volume of vacuum pump


(I) Performance index of vacuum pumping speed

The time for the vacuum system of the lyophilizer to pump from atmospheric pressure to 10Pa should not exceed 30min.

(B) the selection principle of vacuum pump

① The ultimate vacuum of the selected main vacuum pump should be 1 to 2 orders of magnitude higher than the ultimate vacuum required by the lyophilizer. Pharmaceutical freeze-drying generally requires a limit vacuum of 1 ~ 5Pa, and the limit vacuum of the main vacuum pump selected should be higher than 1X10-1 ~ 1X10-2Pa. Rotary vane pump, slide valve pump, roots pump, oil booster pump are all available.

② The working vacuum degree of the freeze-drying box is 4 ~ 4OPa, which should be within the optimal pumping pressure range of the main vacuum pump.

③ The vacuum pump used by the lyophilizer should also be able to remove some water vapor, or it can be adapted to be mixed with water vapor by the pumped gas.

(III) Calculation of pumping rate

The freeze-drying machine has a pre-pumping time requirement. This time requirement is very important when the cold trap and the freeze-drying box share a refrigerator. Failure to meet the requirements may cause the pre-frozen product to melt. If the vacuum condenser (cold trap) is used for cooling while the lyophilizer can still be kept cold at low temperature, this time requirement is not so important. In other words, the required time can be appropriately extended, but this has a slight impact on the performance of the freeze dryer.

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Vacuum pumps in refrigeration equipment

Vacuum pumps in refrigeration equipment

When repairing air-conditioning and refrigeration equipment, the repairman often uses a vacuum pump to evacuate the system. The vacuum should be -0.1MPa for 24 hours, and the vacuum can be increased without significant increase.

1. Structure and working principle of vacuum pump

A commonly used vacuum pump is a rotary vane vacuum pump, which is a mechanical pump sealed with a pump oil and has a structure.

It can be seen that the outer circle of the rotor is tangent to the inner surface of the pump cavity, and the rotary blade is installed in the rotor pick, and is always in close contact with the wall of the stator cavity under the action of the spring. When the eccentric rotor rotates under the drag of the motor, the rotor also rotates. When rotating clockwise, the suction port keeps inhaling gas. The intake cavity keeps expanding. At the same time, the exhaust cavity is getting smaller and smaller, and the gas that has been inhaled is completely compressed. The air pressure rises, and after reaching a certain pressure, the exhaust valve can be opened through the pump oil and discharged through the exhaust pipe. This continuous circulation can play the role of vacuum extraction.

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Precautions to prevent damage to the vacuum pump

Precautions to prevent damage to the vacuum pump

In the case of a small gap, when the temperature rises, the vacuum pump cover will expand, but the pump casing will prevent the cover from expanding. Because of this, a lot of stress is generated in the pump casing, and it even bursts.

In order to prevent the vacuum pump from being damaged due to temperature stress, the following points should be noted:

(1) Insulate the housing of the vacuum pump well;

(2) Heat the vacuum pump slowly and evenly before starting:

(3) Avoid cooling the fog parts containing high temperature parts;

(4) All fittings on the pump casing should be carefully checked based on temperature stress;

(5) The alignment of the shaft and bearing should be checked in a cold state, in a warm-up period, and in a hot state to prevent the shaft from deforming at any temperature.

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Application and main classification of vacuum pump in chemical plant

Application and main classification of vacuum pump in chemical plant

Any pressure below atmospheric pressure is called vacuum. The degree of vacuum is the degree below atmospheric pressure, which is usually expressed as a percentage or millimeter of water (or mercury). If the vacuum degree of a certain equipment is 80%, it means that the pressure in the equipment is changed to 20% of the atmospheric pressure, that is, when the atmospheric pressure is 1 kg / cm², the pressure in the equipment is 0.2 kg / cm². Therefore, when the degree of vacuum is expressed as a percentage, it indicates the degree to which the gas is extracted. When expressed in millimeters of water column, it indicates its residual pressure. If the vacuum in the device is 3x10-2 millimeters of water column, it means that the pressure in the device (that is, the residual pressure) is 3x10-2 millimeters of water column.

In chemical plants, certain production processes are often performed under atmospheric pressure, such as vacuum evaporation, vacuum distillation, and vacuum filtration.

In order to reach the vacuum, it is necessary to have a device that extracts the gas-a vacuum pump. Vacuum pumps can be roughly divided into reciprocating, rotary and jet pumps.

Reciprocating vacuum pump

The principle of the reciprocating vacuum pump and the reciprocating compressor are exactly the same, except that the air distribution mechanism, that is, the intake and exhaust valves are different. Spring valves are generally used in reciprocating compressors, and so-called slide valve air distribution mechanisms are mostly used in reciprocating vacuum pumps.

2.Water ring vacuum pump

Water ring vacuum pump is a kind of rotary vacuum pump. In addition to pumping gas, it can also be used for compressed gas. E.g

The maximum pressure of PMK-2 water ring vacuum pump exhaust gas can reach 1.5 kg / cm², so it is also called water ring compressor. This type of pump should avoid solid particles entering the pump body during operation.

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Method for obtaining vacuum of vacuum pump

The obtaining of vacuum is the main component of vacuum technology. With a variety of methods, a certain degree of vacuum can be obtained in the pumped container. The range of currently available vacuum is quite wide, from 100kPa to 10-11Pa. In other words, it should be from 100kPa to 10-4Pa.

Therefore, different methods should be used to obtain vacuum according to different vacuum requirements and use conditions. The existing methods to obtain vacuum can be roughly divided into the following three categories: vacuum pumps (such as mechanical pumps, diffusion pumps, etc.), getters (red Phosphorus, barium aluminum, titanium, ZrAl16, etc.) and vapor traps (cold traps, dryers, etc.). In the electric light source industry, the main means to obtain a vacuum is to rely on a mechanical vacuum pump and a vapor flow diffusion vacuum pump.

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Component structure of oil-free vacuum system

In recent years, it has been found that vacuum systems that use mechanical vacuum pumps and diffusion pumps to evacuate, because it has enough oil vapor to flow back into the pumped container or device, the performance and technical indicators of many electronic devices are seriously affected. For example, the oxide cathode of an electronic tube reduces its emission performance and life due to oil vapor. Various high-power high-voltage electronic tubes are prone to electrical breakdown due to the presence of oil vapor. The presence of the oil significantly reduces its pressure resistance index, and oil vapor has a significant adverse effect in many places.

Therefore, the vacuum systems used in these areas are required to be replaced by oil-free vacuum systems, that is, instead of using vacuum oil sealing tools (such as mechanical pumps, diffusion pumps) that use vacuum oil seals and vacuum oil as the working fluid, Adsorption of gas molecules, adsorption pumps and pumps that reduce the pressure in the container to obtain the required vacuum.

The adsorption pump uses the porous surface of certain solid materials to strongly adsorb gas in a cold state, so that the closed system obtains a low vacuum of 10-2 mm mercury column. It is used as the front stage of an oil-free system .

Generally, in addition to activated carbon, the adsorbent used by the adsorption pump uses a molecular sieve (artificial zeolite) to adsorb the gas and obtain a vacuum. Because, after cooling with liquid nitrogen, each kilogram of molecular sieve can draw a 50-100 liter container from the atmosphere into a vacuum of 10-2 mm mercury column, so it is a kind of pump with a large air intake. After it is baked at about 400 ° C, the gas it absorbs is released again (called activation or regeneration), and the ability to re-inhale is restored. 5A molecular sieves currently used (large absorption capacity, suitable for exhausting air, but need to be "activated, with an average pore size of about 5 Angstroms) and 13X molecular sieve (its adsorption capacity is smaller than 5A molecular sieve, but it can absorb oil vapor molecules) .

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