Causes of crankshaft wear of Roots vacuum unit

After using roots vacuum unit for a period of time, the problem of crankshaft wear often occurs. The wear is uneven. The radial wear of main journal and connecting rod journal is mainly elliptical, while the axial wear of crankshaft journal is mainly conical. So, how are these crankshaft wear caused? 

1. Because the oil passage leading to the connecting rod journal is inclined, under the action of centrifugal force, the mechanical impurities in the lubricating oil accumulate on one side of the connecting rod journal under the action of centrifugal force, which accelerates the wear of the Journal on this side and makes the wear of the connecting rod journal cone-shaped.

2. Because of the bending of connecting rod, the center line of cylinder is not perpendicular to the center line of crankshaft, the axial force on the journal is uneven and the wear deflection is caused.

3. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal along the circumference. When roots vacuum unit is working, the combined force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the radius of the crankshaft, resulting in wear on the inner side of the connecting rod journal.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Development of Roots vacuum pump unit

Facing the current application of Roots vacuum pump unit, from the perspective of all talents, its useful role shows the excellent function of the equipment. As the application of the unit, the power promotion in all aspects of production has a great effect. From the talent advantage of the product to the development of the function, the utilization rate of the product is greatly promoted. For the future development of the unit, we should improve all functions according to different needs, and increase the application function of the whole set of equipment, so as to improve the overall level of the unit. 

For the use of Roots vacuum pump unit, according to the needs of practice to improve the whole, in the function and utilization rate of the unit for leading scientific rectification, add its advantage of the process to promote, adjust the use of products in all aspects of the function, with a strong value to improve its use, for the future production and application of the root function development, to have The use of talent to expand the functional progress of products.

With the enhancement of market competition, there is a higher demand for Roots vacuum pump unit. If we can show the advantages of the whole product, increase the application investment of product utilization rate and provide efficient service for the user's production process, it will be useful to recognize all specifications and increase the advantages of various functions of products.

Vacuum Pump In Crystalline Silicon Solar Cells

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Measurement of pumping rate of Roots vacuum pump

The constant pressure method is used to measure the pumping rate of Roots vacuum pump. The inlet of the pump is directly connected with the experimental cover, and the outlet of the pump is connected with the front oil seal mechanical pump. A vacuum gauge is set at the inlet and outlet to measure the pressure. The flowmeter is connected with the experimental cover through the regulating needle valve. After starting the vacuum pump and reaching the stable working condition, the measurement can be carried out. The pumping rate should be measured from the appropriate value close to the limit vacuum until the allowable inlet pressure of the pump is nearly stopped. At least four points in each order of magnitude should be measured, and their dispersion should be in accordance with the ratio of 1,2,5,7, such as 1xl0-2, 2x10-2, In the measurement process, after adjusting the needle valve to a certain pressure, the pressure data can be recorded after at least 3min after the pressure reading on the vacuum gauge is stable. If the pressure is changed, the uniform value of pressure in the measurement process should be selected. 

The structural dimensions of the test cover are specified in the Ministry of standards (jb1875-73), and its structure is shown in Figure 7-2. The inner diameter D of the test cover should be equal to the inlet diameter of the pump.

In the equipment for measuring the pumping rate, the vacuum gauge used should be seat type compact vacuum gauge and oil U-type vacuum gauge, and calibrated by the compact vacuum gauge with an accuracy of more than 10%. The air intake plane of the vacuum gauge should be parallel to the air flow direction. It is necessary to have the second-order accuracy in the measurement scale for the flowmeter used in the flow measurement.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Classification of water cooled roots vacuum pumps

(1) Roots vacuum pump with pressure stabilizing box: the rotor profile of this kind of roots pump has arc type, involute type and combined type. It has been described in detail before, but it will not be described here. The difference between this pump and dry roots pump is that it can be directly discharged into the atmosphere without the front stage pump and cooled with water instead of air cooling. A pressure stabilizing box is installed at the mouth of the pump shell, It has the effect of noise elimination and voltage stabilization, and is very convenient to use. 

(2) Roots vacuum pump with separators and silencers for direct discharge to the atmosphere: the structure, working principle and rotor profile of this roots vacuum pump are completely the same as those mentioned above. It is also a so-called wet roots vacuum pump with water cooling and direct discharge to the atmosphere with a front stage pump; The difference is that there is no pressure stabilizing box on the inlet of the pipeline, but a gas-water separator is installed on the pipeline of the inlet port, while a separation and muffler are installed on the pipeline of the entrance of * * to achieve the effect of gas water separation and noise elimination. Now, this kind of equipment is widely used in foreign countries.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Relationship between vacuum degree and pressure in vacuum pump selection

In the selection and use of vacuum pump, we usually use the limit pressure or vacuum degree, as well as pumping speed, flow and other parameters to determine the performance of vacuum pump. And then there's a problem here, where many customers struggle with the relationship between vacuum and pressure. 

Vacuum refers to the rarefaction of a gas. We usually use "high vacuum" and "low vacuum" to express it. In other words, the rarer the gas is, the higher the vacuum degree is; otherwise, it means the vacuum is low, which is always expressed by pressure. The pressure in vacuum system is synonymous with pressure, which refers to the vertical force of gas on the surface of solid or liquid per unit area. Therefore, we can generally understand that the more gas, the greater the natural force on the surface of the object, the greater the pressure; on the contrary, the less gas, the smaller the force, the smaller the pressure.

The higher the vacuum degree is, the thinner the gas is. That is to say, the less the pressure on the object will be. The lower the vacuum degree is, the more gas there is, the greater the pressure will be.

Therefore, when we select the vacuum pump, we can see that the lower the limit pressure, the higher the vacuum degree of the vacuum pump, and the more thorough the corresponding pumping performance, which can achieve lower pressure in practical application.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Scroll vacuum pump

The research of vortex vacuum pump began in the late 1980s. A vertical self rotating oil lubricated scroll water ring vacuum pump with pumping speed of 200L / min was developed. Compared with revolution type vortex vacuum pump, the radial clearance of the pump has the advantages of easy sealing and control. Compared with the vane pump, the scroll pump has higher volumetric efficiency, and the vibration and noise levels in the pump are reduced. In addition, due to its more compact structure, the weight and volume of the machine are reduced by 12% and 40% respectively. The research shows the high efficiency of the scroll vacuum pump, and puts forward the effective methods of how to eliminate the clearance volume and control the clearance. With the continuous expansion of the application of vortex vacuum pump in semiconductor industry, people began to devote themselves to the research of dry scroll vacuum pump. The difference between dry scroll vacuum pump and oil lubricated scroll vacuum pump is that there is no oil and liquid in the pump cavity. Therefore, to solve the problem of sealing and cooling in the pump is the key to the research of dry scroll vacuum pump. 

The ultimate pressure that the pump can reach is 5 × 10 - 3T. It uses water cooling method to solve the lubrication and cooling problems of various parts in the pump. The research shows the feasibility of the dry scroll vacuum pump, and effectively solves the problems such as the contact caused by the thermal deformation of the moving disk and the vibration caused by the centrifugal force. Although the cooling problem of dry scroll vacuum pump can be effectively solved by using water cooling method, the structure of the cooling water circuit is more complicated. Two cooling fans are installed on the main shaft, which are respectively located at the ends of the two stationary disks. When the main shaft rotates, the fans rotate together to achieve the cooling effect on the vortex disk. At the same time, it adopts a semi closed structure to solve the cooling problem of the motor. The pump adopts a totally enclosed structure, the vortex disk is a single vortex ring structure, and the cooling fan is installed at the end of the static disk.


Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

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.

Vacuum Pump Analysis


Liquid Ring Vacuum Pump Sand Blasting Technology

Water Ring Vacuum Pump

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.

Vacuum Pump In Desalination


Selecting A Vacuum Pump

Vacuum Pump Model

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.

How To Reduce Energy Consumption Vacuum Pump

Vacuum Pump Line


Water Ring Pump

Troubleshooting of vacuum degree of vacuum pump

Troubleshooting of vacuum degree of vacuum pump

Vacuum degree indicates the thinness of gas in vacuum state. Usually expressed as absolute pressure and relative pressure. If the pressure in the measured equipment is lower than atmospheric pressure, a vacuum gauge is required for pressure measurement. The value read from the vacuum gauge is called vacuum degree.

The cause of vacuum degree failure of vacuum pump is not the only one, and our detection method is very single. The whole system has only one vacuum meter, which can only reflect the final pumping result of the system, but not the process quantity of each unit at a certain time, which brings a lot of inconvenience for fault finding and increases the troubleshooting time.

At present, the troubleshooting method is basically elimination method, and the steps are as follows:

1. Determine the accuracy of vacuum degree instrument of vacuum pump;

2. Ensure that the system shut-off valve is free of leakage;

3. If the fault is the manifestation of phenomenon I, it is necessary to check the external leakage of the whole system;

4. If the fault is the manifestation of phenomenon II, first check whether the parameters of steam, water and other energy media are abnormal. If not, check each check valve. If not, conduct system performance test to determine which stage of pump has performance problems, and check the nozzle and steam valve of the pump.

Vacuum Pumping System

Best Water Ring Vacuum Pump

What is water ring vacuum pump

Prevent stainless steel vacuum pump from tripping

When using stainless steel vacuum pump in enterprises, sometimes during production, there will be tripping phenomenon, which will affect our normal use and also cause damage to the pump. What kind of measures should we take.

1. When the stainless steel vacuum pump is under load operation, if the current is more than the current set by the electric control box, the vacuum pump will trip and trip by itself. At this time, the tripping phenomenon can be solved by raising the upper limit of current protection;

2. If the vacuum pump is stopped for a long time, the motor load will cause temporary high current. At this time, the air inlet can be closed and the pump can be operated to heat the pump body;

3. When the motor is loaded due to the suction of foreign matters or impurities at the exhaust port of the vacuum pump, the stainless steel vacuum pump shall be disassembled and the internal failure of the pump shall be checked;

4. If the machine is connected to the two-phase power supply and the three-phase power supply is not enabled, the three-phase power supply shall be connected immediately. If there is tripping, tripping, etc. around the hour of operation, the upper limit of current shall be adjusted.

When the stainless steel vacuum pump trips and trips, we should carry out inspection and maintenance, and solve problems in time, so as to use it.

Compact Dry Scroll Pump

2BE Series Compressors

ZJ Roots Vacuum Pump

System operation of water ring vacuum pump

System operation of water ring vacuum pump

Don't you know the operation process of the water ring vacuum pump system? Let's explain the working process to you. First, work is done by the condenser. The object of work is the air stored in the equipment to ensure that the internal air pressure of the equipment is lower than the normal atmospheric pressure. The air moving outward enters the vacuum pump when passing through the inlet valve. After filtering structure in the vacuum pump, it is centrifuged Filter. The air and working fluid are separated. The air enters the exhaust pipe through the pipe and is discharged along the exhaust pipe. The working fluid flows back to the inside of the equipment through the special pipe. This is to prevent the working fluid carried by the gas from moving to the outside of the equipment with the gas, resulting in waste of working fluid and excessive resource input.

When the working fluid enters the equipment through the pipeline, ensure that the liquid level in the equipment reaches a stable state. If the water level measured automatically in the equipment does not reach the corresponding standard, the automatic water replenishing valve can be used to replenish water inward to ensure the water level is stable. Since automatic water replenishment is required, the water replenishing valve shall be kept open during the operation of the equipment. This will not affect the water ring positive air pump water cooling and other situations.
Factors Affecting The Quality Of A Dry Vacuum Pump

Rotary Vacuum Pump For Pulp Bleaching

Oil Diffusion Pump Application Technology

How to draw water from vacuum pump

Vacuum pump is often used for vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture return and vacuum degassing and other industrial purposes. This paper will tell you how the vacuum pump is used for water diversion from the perspective of vacuum water diversion.

1. Close the gate in the pressure water pipe of the water pump and inject water into the vacuum pump. After filling water, close the valve on the funnel, open the air inlet valve on the air inlet pipe and the ball valve of the water supply pipe, and then start the vacuum pump.

2. The mixture of water and gas is discharged from the exhaust pipe. At first, the gas in the mixture accounts for the main component, then, the water component is more and more, until it is all water, it means that the water has been fully filled with the pump, so the water diversion is completed, and the pump can be started. Re speed is to close the intake pipe valve on the intake pipe and stop the operation of the vacuum pump.

3. If there are more than two pumps in the pump station, the air inlet pipe of the vacuum pump can be connected with the air extraction main pipe, and the top of the pump shell of each pump is connected with the air extraction main pipe through the air extraction branch pipe. A valve is installed on each branch pipe so that each pump can be pumped separately.

4. Sometimes, for the sake of standby, two vacuum pumps can be set, and valves are installed on the intake pipe of each pump. In case of failure of one pump, the air inlet valve on the pump can be closed and another pump can be used to extract air, so as not to delay the start of the pump. Under normal circumstances, two vacuum pumps can pump air to the pump at the same time to speed up the water diversion speed.

Of course, when using the vacuum pump, follow the steps to prevent failure or danger.

Water Ring Vacuum Pump Material

Liquid Ring Vacuum Pump

Roots Vacuum Pump

scroll vacuum pump working principle

scroll vacuum pump working principle

scroll vacuum pump mainly includes left stator, right stator, rotor, crankshaft, anti rotation mechanism, air inlet, exhaust port and other parts. The gas is compressed in the crescent cavity composed of a vortex stator and a vortex rotor. The vortex stator is fixed on the periphery of the frame, and an air inlet is arranged around the vortex stator, and an air outlet is arranged at the center of the rotor and the stator vortex body. With the rotation of the crankshaft, the vortex rotor takes the eccentricity as its radius and makes a revolution around the stator center. In addition, the vortex rotor is restrained by the anti autobiographical structure, so it can not autobiographically, and always maintains a fixed posture, in which the center moves around the center of the vortex stator in a circle with a radius of R.

When the scroll vacuum pump is running, the vortex lines of the two vortex stators and the vortex rotors are basically the same. As long as the phases of the two are staggered 180 ° and the centers of the two are kept together R, they can be combined. Results a series of crescent shaped compression cavities were formed between the two vortices. Every 90 ° rotation of the center of the vortex rotor makes a circular motion in a clockwise direction. After the suction, the compression chamber of the outer circumference of the vortex is in a closed state. Therefore, it can be assumed that the volume of the compressor chamber becomes smaller as it moves towards the center.

A compression chamber from the suction, compression, and finally exhaust the whole process. In order to reduce the weight of the pump scroll body, the base material is aluminum, and a layer of polytetrafluoroethylene with special performance is coated on the surface to increase the wear resistance and corrosion resistance. The pressure difference between the adjacent working chambers of the vortex body of the pump is small, so the gas leakage is small, the driving torque of the pump changes little, so the noise and vibration of the pump are low.

The pump is characterized by light weight, small volume and horizontal structure. It can be directly pumped to 10-1pa from atmospheric pressure. It is a dry vacuum pump with a wide range of use.

Easy Maintenance Oil Free Vacuum Pump

Milk Vacuum Pump

Dry Vacuum Pump For High Purity Crystal Vacuum Processing

Screw Vacuum Pump Advantages

Screw Vacuum Pump Advantages

The advantage is a very good summary of the performance of a device. Understanding the advantages of screw vacuum pump can ensure the efficiency of the equipment. After all, knowing that it can be better used in operation, and the effect of using will be very good, of course, without understanding the efficiency will not be so good.

Screw vacuum pump is a kind of suction and exhaust equipment which uses a pair of screw to make synchronous high-speed reverse rotation in the pump shell. It is widely used in pharmaceutical, chemical, semiconductor and other enterprises which require higher clean vacuum.

The two screw rods of screw vacuum pump are corrected by fine dynamic balance, supported by bearings and installed in the pump housing. There is a certain gap between the screw and the screw. Therefore, when the screw vacuum pump works, there is no friction between them, the operation is stable, the noise is low, and the working chamber does not need lubricating oil. Therefore, screw vacuum pump can extract gas containing a large amount of steam and a small amount of dust, which has the advantages of higher limit vacuum, lower power consumption, energy saving and maintenance-free.

Secondly, compared with the oil-sealed mechanical vacuum pump, the condensable substance will not stay in the pump, no oil vapor and oil mist emissions, and is very environmentally friendly. Therefore, the screw vacuum pump is a renewal product of the oil-sealed vacuum pump, and a single screw vacuum pump can continuously discharge the atmosphere directly. The vacuum system can be greatly simplified by pumping from the atmosphere to less than 5Pa.

The working chamber of the screw vacuum pump and the surface of the screw vacuum pump have anti-corrosion coating, which can adapt to harsh working conditions, and after high-precision dynamic balance, it can run at high speed, work smoothly, and the whole body is small.

Liquid Ring Vacuum Pump

Roots Vacuum Pump

Dry Type Oilless Vacuum Pumps

liquid ring vacuum in electric power industry

The basic principles for the development of power industry are to improve energy efficiency, protect the ecological environment, develop hydropower in an orderly manner, optimize the development of coal-fired power, actively promote nuclear power, moderately develop natural gas power generation, encourage new energy power generation, and drive the technological progress of equipment industry.

China will also install at least 130 million kilowatts, including 40 million kilowatts for hydropower, 60 million kilowatts for thermal power, 70 million kilowatts for nuclear power and 30 million kilowatts for other installations. Over 500 key projects with a total investment of 3 trillion yuan were invested in this period. There are 207 thermal power projects, 132 hydropower projects, 8 nuclear power projects, 82 wind power projects and 21 biomass power generation projects. Therefore, the market of electric power pumps will be vast in the next few years.

Of course, vacuum pumps think that the key requirement of electric power pumps is to adopt energy-saving, efficient and environmentally friendly pipeline booster pumps, especially to develop nuclear main pumps, charging pumps, reactor cooling pumps, high-pressure safe water injection pumps, boric acid pumps, nuclear first, second and third-stage pumps, supercritical and ultra-supercritical thermal power unit pumps, boiler feed water pumps. Pre-pump, circulating pump, condensation pump, water ring vacuum pump, centrifugal ash removal pump, reciprocating ash removal pump, coupling, metering pump, pump for refrigeration unit, flue gas desulfurization device and other pump products.

2SK Liquid Ring Vacuum Pump

SY/2SY Series Compressor

2BV Vacuum Pump Impeller Mediation

Speaking of 2BV vacuum pump, I believe it will not be strange to know, but do you know the impeller mediation of 2BV vacuum pump? Following is a detailed introduction to you:

In order to ensure the efficient operation of 2BV vacuum pump, the clearance between impeller and front guard plate of 2BV vacuum pump must be adjusted in time. The clearance between impeller and front guard plate of metal lined pump is 0.5-1 mm, and the clearance between impeller and front and rear guard of rubber lined pump should be equal. When adjusting the clearance of impeller of 2BV vacuum pump, stop the pump first, loosen the bolt of pressing bearing assembly, twist the nut on the adjustment bolt, and make the bearing assembly move forward. At the same time, rotate the shaft by hand according to the direction of pump rotation until the impeller of 2BV vacuum pump rubs against the front guard plate.

For metal lined pumps, loosen the nut just tightened in front by half a circle. Then tighten the nut in front of the adjusting bolt to make the bearing assembly move backward. At this time, the clearance between impeller and front guard plate is 0.5-1 mm. For the rubber lined pump, by twisting the nut on the adjusting bolt, the bearing assembly of the 2BV vacuum pump moves forward first, so that the impeller contacts the front guard sleeve, and moves the bearing assembly backward, so that the impeller and the rear guard sleeve move forward. Contact, measure the moving distance of the total 2BV vacuum pump of the bearing assembly, take this distance as the clearance between the impeller and the front and back sheaths, then adjust the position of the bearing assembly with adjusting bolts to ensure the correct clearance between the impeller and the front and back sheaths. After adjustment, the impeller of 2BV vacuum pump should be re-checked before restarting, and the compression bolt and adjustment bolt of bearing assembly should be tightened, then the 2BV vacuum pump should be started.

Liquid Ring Vacuum compressor

Water ring vacuum pump

Diffusion pump

Ideal diffusion pump fluid should be stable, low vapor pressure, low gasification heat, and should be safe to take, use and pour. It should not decompose, absorb gases, and react with surrounding substances. Unfortunately, there is no pump fluid to meet these requirements. Mercury was first used as the only liquid element in the diffusion pump fluid. Mercury has now been replaced by fractionated carbon-grade compounds and synthetic pump fluids in almost all applications. Mercury vapor pressure is high and must be trapped in a cold trap during operation. It is also poisonous. Even so, it is still used in some special applications, such as mass spectrometry, because it does not decompose and dissolve gases, and because its mass spectrometry is easy to identify.


Before concluding the discussion on the subject of mercury as pump fluid, it should be noted that mercury and oil can not be replaced in conventional oil diffusion pumps. Mercury requires a lower degree of depression than oil, and reacts with some structural materials of the oil diffusion pump. Unless a baffle is installed between the liquid nitrogen cold trap and the mercury diffusion pump, the mercury stored in the boiler will be depleted after several days of continuous operation of the liquid nitrogen cooling above the mercury pump.

Most diffusion pumps use various fractionated hydrocarbons, vinegars, polysiloxanes or ethers. It has been proved that none of the pumping fluids can be well applied to all applications. The pumping speed of light oil is higher than that of heavy oil, and the vapor pressure of heavy pump liquid is lower, which is necessary to obtain the required low limit pressure in high-demand applications. Carbon-nitrogen compound oil was the first organic pump fluid to replace mercury. These pumps decompose when heated, thus limiting the ultimate pressure they can obtain. The light fraction of the pump liquid will flow back into the vacuum chamber, while the heavy fraction will accumulate on the pump. A fractionation pump is introduced to make the light fraction evaporate preferentially to the bottom nozzle after condensation, so that it can be pumped out by the front pump. It is possible to degasse the pump oil by keeping the wall of a section of ejector at a high temperature. Combining with the above and other design advances, the diffusion pump of heavy oil made by molecular distillation of selected hydrocarbons can reach 5*10-5Pa (without cold trap), and 5*10-7Pa with liquid nitrogen cold trap.

Piston Vacuum Pump

Oil Diffusion Vacuum Pump

Vacuum System Introduction

Every equipment that can produce vacuum is called vacuum pump. Mechanical pumps, diffusion pumps, adsorption pumps and titanium pumps are commonly used. The performance of vacuum pump is mainly described by two quantities: pumping rate and ultimate vacuum degree. Mechanical pumps and diffusion pumps use special oils as working substances. Therefore, the pollution of oil and oil to research objects should be prevented. Because these two pumps are inexpensive, they are most commonly used in laboratories.

The pumping rate of mechanical pump is very high, but only 0.1333-1.333 3A low vacuum can be produced. Diffusion pumps must use mechanical pumps as front-stage pumps, which can obtain higher vacuum than 1.333 x10-6~1.333 x10-3Pa. Absorption pumps and titanium pumps belong to oil-free pumps. There is no pollution problem of oil vapor. When they are used in series, they can obtain ultra-high vacuum better than 1.333x 10-7Pa.

The vacuum system consists of three parts: vacuum generation, vacuum measurement and vacuum use. It can be assembled reasonably according to need. To install a good vacuum system is a complex and delicate work. Here is a brief introduction. For more information, please refer to the Monographs on vacuum technology.

The choice of materials and components depends mainly on the vacuum degree. Glass blowing vacuum system is commonly used in laboratory, while metal material is used in general commercial equipment. When choosing mechanical pump, we should pay attention to the matching of vacuum degree and pumping rate with diffusion pump. Vacuum gauge can be used to measure the vacuum degree of the system according to the required address range.

Vacuum-Pump-System-in-Vacuum-Packaging

Vacuum-Pump-in-Plastic-Absorption-Molding

Liquid-Ring-Compressor-in-Chemical-Industry

Vacuum Oil Injection Equipment Technical Characteristics

It is used in power plant, power station, power company, power transformation industry, metallurgy, petrochemical, machinery, transportation, railway and other industries, such as power system, substation maintenance, installation and use.

It can also be used for vacuum oil injection, vacuum drying and hot oil circulation of transformers.

It is more advantageous to use this series of aircraft in high altitude areas.

Vacuum oil injection equipment technical characteristics :

Two-stage high vacuum, large pumping speed and advanced three-dimensional flash technology for dehydration and degassing can remove water, impurities, hydrocarbons and other harmful components quickly and efficiently.

High efficiency improves flash point and compressive strength of insulating oil.

It can satisfy the vacuum pumping and vacuum oil injection of transformer body at the installation or maintenance site.

Multi-stage precision filtering and encryption step by step can effectively remove mechanical impurities in oil.

Automatic constant temperature control, automatic liquid level control, automatic defoaming, automatic pressure protection.

Oil can be filtered online, and no one can run. The running state is shown by the indicator lamp.

The machine has humanized design, low noise, easy operation, long maintenance interval, low energy consumption and low operation cost.

The whole machine is equipped with interlocking safety protection, oil drainage system, vacuum system and heating system interlocking, to avoid misoperation.

Reaction pot body is neat, zero accessories are complete and intact.

Pressure gauges, vacuum gauges, thermometers, safety valves, valves and traps on the pot body shall be sensitive and accurate and shall be regularly checked and marked.

Safety protection, ventilation, explosion-proof and other devices are intact and reliable.

The oil level of reducer and all parts is normal.

The packing seal of stirring shaft is moderately compacted and leak-free.

What-is-pressure-swing-vacuum-drying-equipment

Casting-Vacuum-Casting-Equipment-pouring-Precautions

Vacuum-pouring-batching-process