Axial force of screw vacuum pump

The axial force of the screw vacuum pump may be caused by the uneven pressure on the suction and discharge ports, resulting in uneven pressure on both sides of the impeller, which is not completely symmetrical and produces axial force. But how to solve the axial force? 

Although we need to clean up the axial force of the screw vacuum pump, if we clean it thoroughly, the rotor will rotate unsteadily. Therefore, it is necessary to compensate the amount of 30 by bearing in the design, so that the bearing at the non driving end of reciprocating vacuum pump is usually angular contact bearing, because this method can be used to withstand higher axial force.

The general solution is to symmetrically install the balance disk and impeller of the screw vacuum pump, and the single-stage pump generally has a balance hole on the impeller. Secondly, there is a way to install balance blades on the impeller to balance the axial force.

Screw vacuum pump will be affected by many factors in the process of operation. Any small problems may affect the normal operation. Therefore, regular inspection and maintenance are needed to avoid problems and reduce efficiency.

Water Ring Vacuum Pump Structure

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Development trend of various vacuum pumps

At present, traditional vacuum pumps are still the main vacuum pumps in China, mainly rotary vane vacuum pumps, water ring vacuum pumps, slide valve vacuum pumps, roots vacuum pumps, etc., and all of them are used in traditional industries. The vacuum pumps produced in China are less than 1% for electronic information industry, which is far away from Japan, Europe and the United States.

Most of the dry pumps produced in China are used in laboratory, chemistry, medicine and other fields, but few are used in semiconductor industry. The rapid development of electronic information industry in China has no useful impact on the development of domestic dry vacuum pump, but it has become the expansion of developed countries in vacuum industry in the world.

Dry vacuum pump is the development direction of vacuum acquisition equipment, and also the "top" skill of vacuum acquisition method. It is necessary for China's vacuum pump industry to make a difference in this field, mainly into food, chemical, pharmaceutical and other professions. Through the training and training of these shopping malls, we can enter the semi semiconductor profession. Only in this way can the whole profession keep pace with the times. At present, a series of molecular pumps should be developed in China, such as low-temperature molecular pumps, composite molecular pumps and so on.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Development of water vacuum pump in electric power industry

The basic principles for the development of electric 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 generation, moderately develop natural gas power generation, encourage new energy power generation, and drive the technological progress of equipment industry.

China will also have an installed capacity of 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 others. During this period, there were more than 500 key projects with an investment of over 100 million yuan, with a total investment of 3 trillion yuan. Among them, there are 207 thermal power projects, 132 hydropower projects, 8 nuclear power projects, 82 wind power projects and 21 biomass power generation projects. Therefore, in the next few years, the power pump market is broad.

Of course, Zhonghuan vacuum pump thinks that the key requirement of electric power pump is to adopt various pipeline booster pumps with energy saving, high efficiency and environmental protection, especially the development of nuclear main pump, charging pump, reactor cooling pump, high pressure safety water injection pump, boric acid pump, nuclear first, second and third stage pump, supercritical and ultra supercritical thermal power unit pump, boiler feed water pump, booster pump, circulating pump, condensate pump and water ring Vacuum pump, centrifugal ash pump, reciprocating ash pump, coupling, metering pump, pump for cooling unit, flue gas desulfurization device and other pump products.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Adjustment mode of horizontal multistage centrifugal pump

What are the two most commonly used adjustment methods of horizontal multistage centrifugal pump. The simplest way to change the flow rate of centrifugal pump by valve throttling is to adjust the opening of outlet valve of pump, while the speed of horizontal multi-stage centrifugal pump remains unchanged (generally rated speed), its essence is to change the position of pipeline characteristic curve.

The simplest way to change the flow rate of centrifugal pump is to adjust the opening of pump outlet valve, while the speed of horizontal multi-stage centrifugal pump remains unchanged (generally rated speed), its essence is to change the position of pipeline characteristic curve to change the operating point of pump. The intersection point of pump characteristic curve Q-H and pipeline characteristic curve Q - ∑ h is the limit operating point of the pump when the valve is fully open. When the valve is turned down, the local resistance of the pipeline increases, the pump operating point moves to the left, and the corresponding flow decreases. When the valve is fully closed, the resistance is infinite and the flow is zero. At this time, the pipeline characteristic curve coincides with the ordinate. It can be seen that when the flow is controlled by closing the valve, the water supply capacity and head characteristics of the multi-stage centrifugal pump remain unchanged, and the pipe resistance characteristics will change with the change of valve opening. This method is easy to operate, continuous flow, can be adjusted between a certain maximum flow and zero, and no additional investment is needed. But throttling regulation is to consume the excess energy of centrifugal pump to maintain a certain supply, and the efficiency of centrifugal pump will also decline, which is not reasonable economically.

The deviation of operating point from high efficiency zone is the basic condition for pump speed regulation. When the speed of multi-stage centrifugal pump changes, the valve opening remains unchanged (usually the maximum opening), the pipeline system characteristics remain unchanged, and the water supply capacity and head characteristics change accordingly. When the required flow is less than the rated flow, the head of variable frequency speed regulation is smaller than that of valve throttling, so the water supply power required by frequency conversion speed regulation is also smaller than that of valve throttling. Obviously, compared with valve throttling, the energy-saving effect of frequency conversion speed regulation is very prominent, and the working efficiency of horizontal multistage centrifugal pump is higher. In addition, the adoption of variable frequency speed regulation can not only reduce the possibility of cavitation of centrifugal pump, but also prolong the start-up / shutdown process by preset the time of speed up / down, which greatly reduces the dynamic torque, thus eliminating the destructive water hammer effect to a great extent, and greatly prolonging the life of the pump and pipeline system.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Role of Roots vacuum pump in transportation and storage

(1) Temperature crude oil is always accompanied by low molecular weight methane, ethane, propane and other hydrocarbon gases and hydrogen sulfide gas, which must be removed before storage, transportation and distillation to stabilize the crude oil. At the same time, the components of aviation gasoline, especially their isomers (hydrocarbons with high seismic performance in the tender material) are recovered and utilized. In order to reduce the excessive loss of crude oil in the process of storage and transportation, stabilize the composition of crude oil and gasoline products, and not easy to change the composition of the distillate during storage, a large vacuum crude oil stabilization device has been established in some foreign oilfields. The crude oil is degassed at a vacuum of 310-350mmhg to stabilize the crude oil.

(2) Vacuum refrigeration In order to store propane and butane separated from crude oil easily in atmospheric sickle, deep freezing was used to liquefy it in the past, but at present, many foreign manufacturers use vacuum refrigeration to evaporate the frozen part of propane in vacuum, which can easily get a low temperature below - 48 ℃. Then propane and butane are stored at - 48 ℃ and - 10 ℃ respectively Liquefaction, tank storage or transportation.

(3) After the air discharged from the oil tank is not put into the storage tank through stable crude oil, a lot of losses will be caused when the oil tank "breathes" due to the volatilization of light components. If a vacuum device is used to empty the tank, liquefied petroleum gas (propane and butane) and liquefied natural gas (methane and ethane) can be removed and recycled.

Water Ring Vacuum Pump manufacturers

Water Ring Vacuum Pump

Dry Type Oilless Vacuum Pumps

Operation of wet roots vacuum unit

The wet roots pump does not need the front stage pump to form a vacuum unit, and because roots pump is a constant volume type, with a large speed range, it is easy to operate, requires small power, high volumetric efficiency, and significant mechanical efficiency (no contact between parts), and can be combined with single-stage, double-stage and three-stage. This makes the wet roots pump an ideal and economical vacuum pump in the paper industry. Its operation can be divided into two situations: ① operation with water injection; ② operation with water injection first.

1. Operation with water injection: the air inhaled by the single-stage and double-stage pump is compressed and transmitted through the combined absorption and phase difference separator. A small amount of injected water flows back to the water tank installed under the muffler of the separator. The water can also be injected into the pump for use, and the heat generated by compressed air can be eliminated with only a small amount of make-up water. Some roots pumps directly suck in the water mixture, or no additional cooling water can be injected.

The vacuum pump does not absorb water when it stops working. When it is started again, it should be prevented not to start when it is full of water, otherwise accidents may occur. The injected water can be treated with polyphosphate to prevent water from depositing in the machine and causing the machine to rust.

2. Operation of water free injection: Although there is no water injection, a combined separation muffler with absorption and phase difference or standard muffler can be installed. It can be assumed that 90% of the total noise energy in this device is changed into heat and disappeared.

Rotary Vane Vacuum Pump

Dry Type Oilless Vacuum Pumps

industrial vacuum pumps,vacuum furnaces

Application of condenser in vacuum system

The main function of the condenser is to condense the steam part of the mixed gas above 100 ℃ from the vacuum tank into the liquid below 25 ℃ at one time, so the cooling capacity should be particularly strong, and the condensation effect should be particularly good. Generally, the condensation power shall be more than 3 / 4 of the rated power (i.e. evaporator power) of VPD equipment.

The structure of the condenser is a shell and tube heat exchanger. There are many baffles in the shell side of the air flow to ensure that the air flow can be fully condensed. The total water inlet and outlet pipes are divided into several branches in the condenser to form enough condensation area. Due to the large amount of cooling water, VPD equipment needs to have a special cooling water station or chiller to supply circulating cooling water.

The temperature of cooling water has a great influence on the performance of condenser. The lower the water temperature is, the stronger the water catching capacity is, and the lower the partial pressure of water vapor in the residual gas after condensation is. Generally, the maximum partial pressure of water vapor that the leakage pump can bear is about 3kpa, and the corresponding saturation temperature of water vapor is 24 ℃. That is to say, the temperature of the oil water gas mixture at the outlet of the condenser should not exceed 24 ℃, otherwise, too much water vapor will enter into the leakage pump, affecting its normal work; and the temperature of the cooling water needs to be lower, which is difficult to guarantee in many areas of China in summer. In recent years, in order to effectively enhance the condensation effect, the main condenser of existing VPD equipment is cooled by a water chiller, or a small condenser with cooling water provided by the water chiller is connected in series between the collection tank and the leakage pump to further reduce the partial pressure of water vapor and kerosene vapor in the residual gas.

The working pressure of the condensing system is also very important. It is obvious that if the total pressure in the condenser and the collecting tank is lower than the saturated vapor pressure of water at that time, the water vapor is impossible to condense at all and will be pumped out by the drain pump. In order to fully condense the water vapor, the condensing pressure must be higher than the saturated vapor pressure. However, the pressure of the condensing system should not be too high. Because the pressure of the condensing system is too high, the gas pressure in the vacuum tank is required to be higher. Otherwise, the mixed gas cannot flow into the condenser naturally under the effect of the pressure difference, and the high pressure in the vacuum tank will directly affect the outward diffusion of water vapor in the insulating material. In consideration of the above two factors and the presence of permanent gas components in the residual gas, the working pressure in the condenser is selected as 4.5kpa, which can not only ensure the sufficient condensation of water swallow gas, but also make the pressure in the vacuum tank as low as possible

In the VPD equipment, there is also an auxiliary condenser in the condensation system, which is specially used to receive the high-temperature kerosene vapor discharged in the later stage of the kerosene purification process in the distillation chamber. The structure of the auxiliary condenser is the same as that of the main condenser. The power of the condenser corresponds to the power of the distillation chamber, and the condensed kerosene liquid is also discharged to the collection tank.

Dry Type Oilless Vacuum Pumps

Dry Scroll Vacuum Pump

SSR Roots Type Blowers

Material selection principle of vacuum material in vacuum pump

① The vacuum pump has enough mechanical strength and rigidity to ensure that the shell can withstand the atmospheric pressure under the room temperature and baking temperature, and does not deform when heating and baking (especially for ultra-high vacuum system).

② Good air tightness. To maintain a good vacuum environment, the wall material should not have porous structure, cracks or other defects that cause leakage. There are lower permeability rate and outgassing rate.

③ The saturated vapor pressure at the operating and baking temperatures should be low enough (especially for ultra-high vacuum systems).

④ Good chemical stability. It is not easy to oxidize and corrode, and does not react with the working medium in the vacuum pump and the outgassing in the process.

⑤ Good thermal stability. Keep good vacuum and mechanical properties within the working temperature (high and low temperature) of the system.

⑥ Under the working vacuum degree and working temperature, the internal components of the vacuum vessel shall maintain good working performance to meet the requirements of the working process.

⑦ It has good ductility, machinability and weldability, and is easy to process into complex shell.

What Is A Turbo Blower

What Is A High Pressure Blower

Turbo Blower Use Instructions

reciprocating vacuum pump maintenance method

In the normal use of vacuum pump products, it is inevitable that there are some problems due to incorrect use methods or loss. At this time, we need to master some maintenance knowledge to ensure the normal operation of the product, so as to ensure the normal operation of the work.

1. The pump shaft is generally made of 45 steel, and the installation seal journal is subject to high-frequency quenching with a hardness of 45-50hrc. In the process of use, the pump shaft may be damaged by journal wear, keyway key rolling, bending and so on.

During the maintenance of reciprocating vacuum pump, if the seal journal is found to be slightly covered and worn, it can be carefully polished with fine emery cloth or west oilstone. When the wear is more than 0.15mm, it can be chrome plated and then ground to the specified size. For the bending and straightening, please refer to the repair of centrifugal pump shaft. In case of serious damage, it can not be repaired, and the shaft and rotor can be replaced.

2. Repair of the end cover of reciprocating vacuum pump: the end cover is made of high-quality cast iron, which is practical. Due to the displacement of the shaft, the end face of the rotor is not vertical and other reasons, the end cover may be scratched or worn. The flatness of the end cover plane is out of tolerance.

In the process of repair, for the inspection of the flatness of the end cover, put the knife edge ruler on the plane of the end cover, use a feeler gauge to insert between the knife edge ruler and the end cover, and use the maximum straightness to replace the flatness.

SSR Roots Type Blowers

Oil Diffusion Vacuum Pump

Dry Type Oilless Vacuum Pumps

The reason of noise of water ring vacuum pump and its solution

The reason of noise of water ring vacuum pump and its solution

Many users report that their own water ring vacuum pump often produces noise in the process of use, and the higher the pumping rate and vacuum degree of the pump, the greater the noise. The following content for you to introduce the cause of the water ring pump noise and specific solutions, you can refer to!

1. Large noise of the motor: if the noise of the water ring vacuum pump is caused by the large noise of the motor, the motor with low noise can be selected or the motor acoustic cover can be added.

2. Loud noise caused by installation: check whether the equipment foundation is installed firmly to avoid vibration; the motor shall be aligned with the pump coupling to avoid noise and vibration caused by insufficient connection accuracy.

3. Noise caused by vent of exhaust port: if noise is caused by this problem, muffler can be installed at the outlet.

4. The vacuum pump works under the limit vacuum: the limit vacuum of the water ring pump disc distribution board structure vacuum pump is 33hpa (absolute pressure), which will vibrate and increase the noise when it works at 50hpa generally. The limit vacuum of the water ring pump of the vertebral body distributor structure is 100hPa (absolute pressure), which will vibrate and increase the noise when it works at 110hpa generally. Therefore, we should correctly select the vacuum pump and avoid working at the extreme Vacuum limit.

5. Mechanical friction: we should often remove scale to avoid excessive noise caused by mechanical friction.

When the noise of the water ring vacuum pump is too loud in use, we should find out the cause of the noise in time, so that we can take targeted measures to solve the problem.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

Dry Type Oilless Vacuum Pumps

Single screw pump

There are basically three types of screw pumps commonly used in the industry. They are divided according to the number of screws, namely, single screw pump, double screw pump and three screw pump. Then, let's see their characteristics and differences:

Single screw pump structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is soft), which can swing back and forth along the pump center line, and always keeps mesh with the stator.


Features of single screw pump:

1. It can transport liquid containing solid particles;

2. It can be used for almost any viscosity fluid, especially for high viscosity and non-Newtonian fluid;

3. The operating temperature is limited by the stator material.

Performance parameters: the flow rate can reach 150m3 / h, and the pressure can reach 20MPa.

Application of single screw pump: for molasses, pulp, starch paste, chocolate paste, paint, tar, paraffin, grease, mud, clay, clay, etc

industrial vacuum pumps,vacuum furnaces

Dry Screw Vacuum Pump

SSR Roots Type Blowers

Negative pressure Roots blower

Now many customers can't tell what is a negative pressure roots blower, what is a Roots vacuum pump, what is a vacuum pump, what is a Roots blower, and they made a simple mistake when they bought it. Now we summarize the following points. In the roots blower profession, the roots vacuum pump is what most people call a negative pressure roots blower. Its principle is the same as that of a Roots blower, which is a volume reverse blower Machine.

A reverse compressor in which two lobed rotors move relative to each other in the cylinder to compress and transport gas. The roots blower is simple in structure, convenient in manufacture and suitable for gas transportation and pressurization under low pressure. Conceptually speaking, roots blower is a kind of usage in vacuum pump. Positive pressure blower is used with large air volume. Its use is impossible for vacuum pump, such as water tank aeration, oxygen supply, powder transportation, etc.

There are several kinds of vacuum pumps, such as water ring vacuum pump, rotary vane vacuum pump, steam jet pump, molecular pump, reciprocating vacuum pump, fixed vane vacuum pump, slide valve vacuum pump, cycloid vacuum pump, roots vacuum pump, etc. the principle is to discharge the gas out of the pump through the change of the volume generated by the rotation of the structure of the biased rotor in the pump cavity, mainly in the suction process.

The volume of the suction cavity increases and the vacuum degree decreases. When the gas in the container is sucked into the pump cavity, the volume becomes smaller and the pressure increases during the exhaust process. After all, the gas inhaled is discharged out of the pump through the oil seal. In terms of parameters, most of the vacuum degree of the vacuum pump is higher than that of the roots vacuum pump, and the air volume is larger than that of other roots vacuum pumps, so the negative pressure can be smaller than that of the roots vacuum pump.

Water Ring Vacuum Pump manufacturers

Roots Vacuum Pump

Piston Vacuum Pump

Main function of pump body

The pump body is also known as the pump housing. The main function of the pump body is to close the impellers of various pumps and the medium to be transported in a certain space, concentrate the medium discharged from the impellers of the pump to the outlet pipeline, and convert a part of the velocity energy of the medium into the boosting energy, so as to speed up the velocity of the outlet pipeline, and increase the pressure to achieve the purpose of constant flow of water energy at the low place to the high place. The pump body is also a part that bears the medium pressure.

There are three kinds of commonly used pump bodies: volute type double suction centrifugal pump: the shape is very similar to the snail's shell, the volute has different cross-section and gradually expanded flow channel, and the shape and size of the flow channel have a great impact on the flow head of the pump. As shown in Figure 2-7

Pump body with inducer device: the pump body is a rotating body model, and there are several flow channels with inducer structure outside the impeller in the pump body.

Double layer pump body: a cylinder shaped pump body is added outside the general pump body, which is called double layer pump body, This kind of pump body can usually play the role of heat preservation or temperature reduction. For example, when the sewage pump is automatically stirred to deliver high-temperature liquid, if you want to keep the temperature unchanged, you can apply hot water or heat preservation liquid to the outer layer to keep the liquid in the pump body from falling. If you want to reduce the temperature, you can apply cold water to the outer layer to also play the role of temperature reduction.

Piston Vacuum Pump

Oil Diffusion Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Common abrasion phenomenon of water pump

Abrasion (erosion, erosion) refers to a kind of wear caused by the impact of multiphase flow medium on the surface of materials. The phenomenon of water pump abrasion has become one of the main causes of material damage in many industrial sectors. It is considered that abrasion accounts for 8% of the total wear damage in industrial production.

According to the flow medium, the abrasion phenomenon of water pump can be divided into two categories, i.e. air blast abrasion and liquid flow or water drop abrasion. The second phase carried in the flowing medium can be solid particles, liquid drops or bubbles. Some of them directly impact the surface of the material, while others collapse (bubbles) on the surface, thus exerting mechanical force on the surface of the material. According to the arrangement and combination of flow medium and second phase, the abrasion phenomenon of water pump can be divided into four types

The abrasion caused by the impact of solid particles carried by the liquid medium on the surface of the material is called slurry abrasion. The flow passage parts of mud pump and slurry pump used in the construction industry, oil drilling, coal mining, metallurgical industry and thermal power station are seriously abraded. In recent years, people have been committed to the comprehensive development and utilization of coal resources. In the gasification, liquefaction (preparation of kerosene slurry and coal water slurry), transportation and combustion of coal, there are a lot of material erosion problems. Whether some advanced processes and designs can be realized or not is even based on the complete understanding of the abrasion of materials or components.

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Roots Vacuum Pump

Construction principle of water ring vacuum unit

The limit pressure of one pump and one water ring pump is 400pa, which can satisfy the general vacuum demand, but the scale of its application will be limited to a certain extent. If two roots pumps are used in series and combined with the water ring pump, the limit pressure of the unit can be greatly increased (up to 25Pa). Therefore, in this type, two roots pumps are generally seen in series, and then the two-stage pump is used as the front stage pump to form the unit. If a higher limit pressure is required, the combination of three roots pumps and water ring pump can be used, and its limit pressure can reach 1pA.

If it is required to deal with a lot of water vapor vacuum system, it is more appropriate to use water ring pump. However, due to its low limit vacuum degree, the limit vacuum degree of the whole unit is relatively low. Although in the vacuum pumping system with high vacuum degree, the mechanical vacuum pump with high demand limit vacuum is used as the pre-stage pump. The air ballast mechanical vacuum pump can be paralleled with the water ring pump as the front pump of the pump. During vacuum drying, the water ring pump is used for pre pumping until its water vapor is greatly reduced, and then the pneumatic mechanical vacuum pump is started to cut off the water ring pump. If it takes a long time to finish a boring situation, it needs less cooling water and power.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Magnetic pump

Magnetic drive pump is a new centrifugal chemical process pump based on centrifugal pump, which uses magnetic coupling to realize the non-contact transmission of torque, no shaft seal, full seal, no leakage, corrosion resistance and no pollution.

Magnetic pump is a kind of non leakage fluid conveying machinery without dynamic seal. It is mainly designed for the centrifugal pump in vane pump, which is usually composed of pump body, isolation sleeve and connecting parts to bear the pressure. There is a rotating permanent magnetic field on the outside of the seal chamber, which drives the magnetic rotor components in the seal chamber to rotate synchronously through the effect of magnetic field, while the rotor components in the seal chamber drive the impeller to work on the fluid.

Since there is no dynamic seal in the shielding seal cavity composed of stator components, and the rotating shaft driving the impeller to do work does not penetrate the shielding seal cavity, thus ensuring zero leakage and no pollution of the magnetic pump.

Vacuum System In Steam Treatment Unit

Screw Vacuum Pump In Medicine Drying

Water Ring Pump

Principle and performance characteristics of reciprocating vacuum pump

Principle and performance characteristics of reciprocating vacuum pump

Unlike the principle type of reciprocating pump transmission medium, the reciprocating vacuum pump is also a kind of equipment that uses the cylinder and the piston to reciprocate to generate suction, the difference is that one conveys the medium and draws a vacuum. Because the working medium of the reciprocating vacuum pump is gas, when the piston runs to the outer dead point, the stress will expel the gas in the cylinder as much as possible, so as to avoid too much residual gas and cause the piston to move inwards.This part of the gas expands and reduces the suction the amount.

Of course, compared with the structure of the intake valve and the discharge valve of the reciprocating pump, the structure of the intake valve and the exhaust valve is also different. When the eccentric wheel 2 on the main shaft of the reciprocating vacuum pump with a plane slide valve gas distribution mechanism rotates, the joystick 3 is driven to reciprocate, thereby driving the plane slide valve in the slide valve gas distribution mechanism 1 to make it reciprocate. The eccentric angle of the eccentric shaft is 90oa.

The flat slide valve gas distribution mechanism is an important feature of the reciprocating vacuum pump that is different from other delivery pumps:

Reciprocating vacuum pump plane slide valve gas distribution mechanism. There is an inverted "II" shaped air passage on the spool valve. When Huozhai moves to the dead point, the flat spool valve is in the middle position, and no high-pressure gas discharged from the cylinder clearance passes through this "II" shaped gas. Flow into the working chamber on the other side of the piston, that is to say, through this "n" shaped air passage, the pressure on the exhaust side is reduced, so that a considerable part of the exhaust side has not been exhausted into another instance, which can be Discharge on one side. In this way, the working efficiency of the cylinder of the vacuum pump is improved, and the pressure on both sides of the piston dead point is balanced.

The plane slide valve gas distribution mechanism mainly plays the role of pressure balance. The ratio of exhaust pressure to intake pressure is called the pressure ratio. If you want to get a 95% vacuum, when the suction pressure is 38x33.32Pa and the discharge pressure is 760x133.2Pa, the pressure ratio is ￡ one chip and two 20. In the case of such a high pressure ratio, the volume coefficient is easy The drop is so low that the pumping rate drops to near zero. Therefore, measures to improve the volume coefficient must be taken in the structure. This measure is generally a method of pressure balance.

Due to the complexity of the structure of the reciprocating vacuum pump, it also determines the difficulty of its maintenance. However, it does not need to be lubricated by Youfu, and it is also widely used in many fields. In order to better utilize the performance of reciprocating vacuum pumps and improve the needs of industrial production, in recent years, continuous research has been carried out, and many manufacturers have carried out good pumps. The improvement, for example, the plane slide valve is changed to the automatic spring intake and exhaust valve in the compressor, which not only simplifies the pump structure, but also provides side speed, of course, the pump volume can also be reduced.

Roots Vacuum Pump

Dry Type Oilless Vacuum Pumps

industrial vacuum pumps,vacuum furnaces

importance of cleaning dry vacuum pump

Keeping the dry vacuum pump clean can guarantee the performance of the vacuum pump. No matter what kind of equipment, if any pollutant enters, it will affect the normal operation of the equipment. This is the case with the vacuum pump. Even if a particle enters the key operation part of the vacuum pump, it is likely to cause damage to the vacuum pump.

Dry vacuum pump is composed of many different parts, which are all finished by various machining, such as turning, milling, planing, grinding, filing, welding, etc. In this way, the surface of parts will inevitably be stained with a lot of processing grease, sweat marks, polishing paste, flux, metal chips, oil scale and other pollutants. These pollutants are easy to volatilize in vacuum and affect the vacuum of vacuum equipment. In addition, pollutants absorb a large number of gases at atmospheric pressure. In vacuum environment, these gases will also be released. The factors controlling the vacuum of dry vacuum pump are constituted. For this reason, contaminants must be removed before parts are assembled.

During the use of dry vacuum pump, the parts will be polluted. The pollution is related to the service conditions and vacuum pump. For example, the vacuum drying system will be polluted by the evaporated materials after being used frequently; the inner wall of the vacuum coating machine will be polluted by the evaporated materials; the inner wall of the ion beam etching equipment will be polluted by the sputtered splashes of the workpiece; the filament of the electron gun in the vacuum will form a metal film on the nearby surface due to the high temperature evaporation; the gauge filament will evaporate under the high temperature to make the ceramic insulator shape Film forming, damage insulation strength, affect the accuracy of measurement. The mechanical pump oil and diffusion pump oil in the vacuum system are more pollution sources. After the equipment works for a long time, obvious oil film will be formed inside the equipment. These pollutants will also affect the performance of the equipment, and should be removed at any time.

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

industrial vacuum pumps,vacuum furnaces

water pump selection principle

The key to the selection and matching of water pump lies in the rational selection of water pump. Pump type selection is to determine the type, model and number of pumps according to the characteristic lift, design flow and its change rule of pump station.

(1) It should meet the requirements of design flow, design head and water supply and drainage in different periods.

(2) In the long-term operation of water pump, the efficiency of pump station is high and the operation cost is low under the multi-year average head; in the highest and lowest head, the water pump should be able to operate safely and stably without leaving the working range of high-efficiency area of water pump. Under various working conditions of the design standard, the pump unit does not appear cavitation, vibration, overload and other phenomena.

(3) Series, standardization and renewal products are preferred. The pump type with good performance, wide high efficiency area and suitable for the change of pump head and flow shall be selected. When the series of products can not meet the requirements, new products can be developed and trial manufactured according to the specified procedures. For the pump station with large head variation, the pump with steep Q ~ H curve should be selected; for the pump station with large flow variation, the pump with gentle Q ~ H curve should be used.

(4) According to the selected unit to build the station, the equipment investment and civil construction investment are required to be the most economical, easy to construct, operate, maintain and manage.

(5) For cascade pump station, the model and number of pumps shall ensure the flow coordination requirements between the upper and lower pump stations.

(6) Try to take into account the characteristics of comprehensive utilization and development of water conservancy.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Sk water ring vacuum pump equipment description

Sk water ring vacuum pump equipment description

SK series water ring vacuum pump and compressor system is composed of vacuum pump (compressor), coupling, motor, air-water separator and bamboo circuit.

The working process of vacuum pump, compressor and gas-water separator is as follows: the gas enters the vacuum pump or compressor through the valve through the pipeline, then it is discharged into the gas-water separator through the air guide pipe, and then it is discharged through the exhaust pipe of the gas-water separator. When it is used as a compressor, the gas-water mixture discharged by the compressor is in the water separator. The gas is delivered to the system to be pressurized through Langmen, while the water is left in the gas-water separator. In order to maintain a certain water level of the gas water separator, an automatic overflow switch is installed, When the water level is higher than the required level, the overflow switch is turned on. Water overflows from the overflow valve: when the water level is lower than the required level, the overflow switch is turned off, and the water level in the gas-water separator rises to the required level. The working water in the vacuum pump or pressure machine is supplied by the gas-water separator (or tap water). The size of the water supply plate directly affects the performance of the vacuum pump, so the water supply pipe Valve control on.

The difference between gas suction system and pressure delivery system is that the internal structure of gas-water separator is ignored. When pumping gas, the pressure at the suction port is lower than the atmospheric pressure, while the pressure at the exhaust port is equal to the atmospheric pressure, and there is only overflow pipe in the gas water separator: when pressing gas, the suction port is under atmospheric pressure (or vacuum state), and the pressure at the exhaust port is at a atmospheric pressure. In order to ensure the delivery gas pressure, the water level of the gas water separator is controlled by the overflow switch.

Because in the working process, work produces heat, which will make the working water ring hot, and a part of water and gas are discharged together, therefore, in the working process, the pump must be constantly supplied with water to cool and supplement the water consumed in the pump to meet the working requirements of the pump. When the gas discharged from the pump is no longer used, a gas-water separator is connected at the exhaust end of the pump (a water tank can be made by yourself to replace it). After the waste water and part of the water are discharged into the gas-water separator, the gas is separated, the gas is wiped out by the wiping gas pipe, and the left water is supplied to the pump for further use through the return pipe. With the extension of working time, the temperature of working water will increase continuously. At this time, a certain amount of cold water (tap water) shall be supplied from the water supply of gas-water separator to reduce the temperature of working water and ensure that it can meet the required technical requirements and performance indicators.

When it is used as a compressor, the pump exhaust 11 is connected with a gas water separator, and the gas water mixture enters the gas water separator and then automatically separates, The gas is sent from the exhaust pipe to the required system, and the working water passes through the automatic When the switch is overflowed and the compressed gas is discharged, the working water is very easy to heat up. When the water is discharged from the pump outlet, the temperature will become higher. Therefore, at the bottom of the gas-water separator, the cold water shall be continuously supplied to supplement the discharged hot water and play a cooling role when necessary, so that the temperature of the working water will not be too high, so as to ensure the performance of the compressor, meet the technical indicators and meet the process requirements.


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