Roots water ring vacuum unit

Roots water ring vacuum unit is composed of roots pump as main pump and water ring pump as front pump in series. It can be understood as two main points: water ring pump and roots pump. 

Both roots pump and roots vacuum unit have a number of utility model patents, for example, the series Roots vacuum unit that can be started at the same time solves the shortcomings of the start-up mode of Roots vacuum unit in the prior art, such as long time consuming, low efficiency and large energy consumption, mainly including the front vacuum pump and roots vacuum pump driven by the motor of Roots vacuum pump An exhaust port is arranged on the roots vacuum pump, an air suction port is arranged on the roots vacuum pump, a pneumatic ball valve is arranged between the front vacuum pump and the roots vacuum pump, and the motor, the pneumatic ball valve and the differential pressure detection device of the front vacuum pump are all controlled by the control cabinet. The beneficial effect of the utility model is: on the premise of ensuring that the motor of the roots vacuum pump is not overloaded, the pumping speed is increased by controlling the pressure difference between the inlet and outlet of the roots vacuum pump, so as to shorten the starting time of the vacuum unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Overall arrangement structure and installation of vacuum pump

Now the field of vacuum pump is becoming more and more extensive, so now there are more kinds of products. Now with the continuous development of vacuum technology and the requirements of scientific research field for its pressure are becoming wider and wider. Basically, the vacuum pumping system composed of several vacuum pumps can meet the production after common pumping. 

At present, the departments concerned are quite familiar with the working pressure range of the vacuum pump, so any type of vacuum pump will not be fully applicable to all working ranges, and different types of vacuum pumps can only be selected according to different working requirements and pressure ranges.

In order to be more convenient to use, vacuum pumps with different performance will be combined according to their different requirements in the process of vacuum technology. The use of products is an essential main pump in the application of vacuum technology in various industries of our national economy.

The overall layout structure of the vacuum pump will directly determine the overall structure of the pump. The vertical structure, the horizontal device of the air inlet and exhaust port and the connected pipeline are more convenient, but the center of gravity of the pump is relatively high when it is used, so its stability performance will be poor when it is running at high speed.

When the horizontal pump is installed, its exhaust port needs to be below, while the air inlet needs to be above. Sometimes, in the process of installation, for the convenience of system pipeline installation and connection, the exhaust port can be connected from the horizontal direction, and the direction of air inlet and exhaust is perpendicular to each other.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Stainless steel vacuum pump pumping requirements

Stainless steel vacuum pump can be used to pump air to reduce pressure, but what should be pumped? 

Combine the pump correctly. Due to the selective pumping, sometimes a stainless steel vacuum pump can not meet the requirements of air extraction. Several pumps need to be combined to supplement each other to meet the requirements of air extraction. If the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get better vacuum degree.

In addition, some stainless steel vacuum pump can not work under atmospheric pressure, need pre vacuum; some stainless steel vacuum pump outlet pressure is lower than atmospheric pressure, need the front stage pump, so all need to combine the pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Dry screw vacuum pump for yarn steamer

The main purpose of the steaming machine is to combine the continuous silk thread with weaving conditions and stop the setting after twisting, that is to stabilize the twist under a certain pressure and temperature, and obtain balanced and non twisting silk thread. The operation process of yarn steaming machine is vacuum preheating humidification heat preservation constant temperature vacuum cooling ending. The dry screw vacuum pump for vacuum pumping is generally water ring type dry screw vacuum pump. The working pressure of the steaming machine is – 0.085-0.1mpa. The water ring type dry screw vacuum pump can extract a certain amount of condensable gas. 

The yarn steaming machine with dry screw vacuum pump can stop the uniform, accurate and mild steam treatment of yarn or fabric from low temperature to high temperature. The steam process is controlled by microcomputer, and the temperature is controlled to ± 0.5 ℃. It can ensure that the yarn steaming process can be reproduced accurately according to the budget process, avoid the generation of condensate water to the maximum extent, and make the yarn get uniform and mild steam treatment.

Therefore, it can be used in this process. How large the water ring type dry screw vacuum pump is used, the suitable dry screw vacuum pump can be selected according to the size of the yarn steaming machine and its own time request.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Dry screw vacuum pump

The screw vacuum pump has a recovery system, which is fully in line with the concept of energy conservation and environmental protection, and is more widely used. But why is the market share of dry-type screw vacuum pump not high? In addition to the price plateau, there are also users who do not have a good understanding of the dry vacuum pump and can not see the future economic benefits brought to the enterprise. This paper focuses on how to optimize the selection of dry vacuum pump? 

For these different types of dry vacuum pump, we are eager to be able to reduce its physical size. But this is in contradiction with the pumping rate of the vacuum pump, because the pumping rate of the vacuum pump is directly proportional to the volume of the vacuum pump. Small physical size means small volume. Of course, there is also an important factor that affects the pumping rate of vacuum pump, that is, the rotational speed. In order to match the pumping rate of small size vacuum pump with that of large size vacuum pump, it is necessary to increase its speed.

There are two ways to change the speed of vacuum pump, one is to change the frequency of power supply, that is to use frequency converter; the other is to change the transmission ratio of gearbox. The advantage of frequency converter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Changing the gear ratio of the gearbox is a very economical method. Of course, it can only provide a single speed which is not controllable.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Selection of lining materials for corrosion resistant vacuum pump

Corrosion resistant vacuum pump is a kind of self-priming pump with liquid corrosion resistance and long service life. Its material must be special. The first characteristic is corrosion resistance. Next, we introduce the selection of lining materials for corrosion-resistant pump 

It is necessary to satisfy the technical parameters of flow, head, pressure, temperature, NPSH and other technical parameters of corrosion-resistant vacuum pump products. It is necessary to satisfy the requirements of medium characteristics. F46, as the material of equipment fabric, absorbs a few touch substances in the process of application because there is a small space between F4 macromolecules, which is dispersed and relocated among them. The absorption image is usually shown by a small amount of weight gain and color change, and the amount of absorption increases with the increase of working pressure and touch time. In addition, it can be solved by lowering the temperature, shaking the scale and improving the planning.

In addition, the volume of pores between macromolecules increases with the increase of temperature, and liquid absorption and infiltration will also be added. Thus, the circulation effect at high temperature will cause the liquid absorbed by F4 to expand or transpiration, resulting in pores, and finally form damage. For example, after 34 months of operation, small spots appear on the surface of the pipeline of trichlorosilane rectification equipment, which will be carried out continuously in small shifts for one year. Therefore, this is the demand for F4 sheet as chemical anti-corrosion fabric. The lower the porosity content, the better. The specific gravity is necessary to be greater than 2.18, and the thickness is also required, usually 1.5 ~ 3 mm. The planned service life of the pump is usually at least 10 years. When determining the type and manufacturer of the pump, we should sum up and consider the pump's function, energy consumption, reliability, quotation and manufacturing standards.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to optimize the selection of dry screw vacuum pump

Different types of dry vacuum pump, we are constantly looking forward to reducing its physical size. However, this is in contradiction with the pumping speed of the vacuum pump, which is proportional to the volume of the vacuum pump. Small physical size means low volume. Of course, another important factor affecting the pumping speed of vacuum pump is speed. In order to make the suction speed of small vacuum pump different from that of large vacuum pump, it is necessary to improve the speed. There are two ways to change the speed of vacuum pump, one is to change the frequency of power supply, even with frequency converter; the other is to change the proportion of gearbox. Among them, the advantage of using frequency converter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Changing the gear ratio of the gearbox is a very economical way, of course, it can only provide a single speed, can not be controlled. 

Today, you can see that there are so many different designs for dry vacuum pumps, each with its own characteristics and advantages and disadvantages. In history, the use of capital has been an important factor influencing people's choice of vacuum pump. More and more vacuum pump users realize that the stability of vacuum pump should also be considered. Due to the wrong solution of the vacuum pump, the efficiency of the machine is reduced, which affects the consumption and delivery of the wafer, resulting in the formation of wafer scrap and processing damage of other parts. As the screw design adopts a single-stage design, the number of parts used can be reduced by up to 60% compared with multi-stage pumps (such as ball gap, claw and combination). This is a big advantage for stability and future maintenance costs.

In general, if the user thinks the power consumption is the most important for him, then choosing an internal compression screw may be a good choice, and the nitrogen content is the least important for him. However, in general, the requirements for tail gas disposal are more and more severe, so it is particularly important to reduce the amount of nitrogen used in the future. If you want to dispose of a variety of semiconductor processes without changing them with a simple inventory control pump, external compression screws are the best choice.

Rotary Screw Vacuum Pump Performance And Structural Characteristics

Vacuum Pump In Farm Vehicle Power System

Vacuum Unit Equipment In Light Oil Metallurgic Requirements

Environmental protection water ring vacuum unit

The environmental protection water ring vacuum unit is designed and optimized according to the requirements of modern enterprises for environment and environmental protection, integrating the characteristics of various industries. The manufacturing unit is composed of water ring vacuum pump, waterway system, vacuum system, cooling system, silencing system and control system. It is mainly designed and manufactured according to the specific conditions of customers 

1. Ensure that the gas and liquid with pollution are concentrated and will not leak, and truly achieve zero pollution

2. Low noise, the use of noise abatement facilities, will not cause noise pollution, especially suitable for the working environment of man and machine together

Application: daily chemical, medical (especially dental), food, pharmaceutical, electronic, laboratory.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

dry vacuum pump operation process

What is the operation process of dry vacuum pump? Let's discuss the operation process of dry vacuum pump as follows: 

After the equipment is running, with the rotation of the motor and the action of the crank connecting rod mechanism, the piston in the cylinder repeatedly makes reciprocating motion. As the piston moves from left to right in the cylinder, the pressure in the left chamber will continue to decrease as the cylinder volume increases. When the pressure in the left chamber is gradually lower than that in the pump chamber, according to the principle of air pressure balance, the gas in the pump chamber is sucked into the left chamber one by one through the suction valve. At this time, the suction valve is in the suction, which completes half of the working process of the vacuum pump.

When the piston moves to the right, the left chamber of the cylinder is filled with gas. When the piston moves from right to left, the suction valve of dry vacuum pump will close automatically. As the piston moves from right to left, the gas is slowly compressed. When the steam body in the cylinder reaches the exhaust working pressure, the exhaust valve will open to exhaust and carry out the working circulation system. When the piston moves again from the left end to the right end, the above cycle is repeated until the suction container reaches a relatively balanced pressure.

Vacuum Bellows Type

Vacuum Valve Common Connection Forms

Rotary Vane Vacuum Pump In Servo Cooling Equipment 

lax pump working principle

The structure principle of the lax pump is that the bottom of the pump is a transpiration device, which stores the oil of the lax pump. The upper part is the air inlet, and the right side pipe is the port. During the operation, the front vacuum is supplied by the mechanical pump. When the oil is heated by an electric furnace, the steam of the oil will flow along the 

The flow pipe is ejected downward through the umbrella nozzle. Due to the vacuum (10-2 ~ 10-3 Torr) supplied by mechanical pump outside the nozzle, the oil steam can be ejected for a long interval and hooked into a jet moving towards the mouth. When the jet finally meets the wall of the vessel cooled by cooling water, it will form a liquid rest and flow back to the transpiration device for use from the beginning.

Once the gas molecules enter the pump from the inlet, once they fall into the steam flow, they get the moving maximum of downward movement and fly down. Because the jet has high velocity (about 200 meters per second), high steam density (steam pressure several to dozens of Torr), and the loose pump oil has high molecular weight (350-500), it can effectively remove gas molecules, so in the interface of the jet, gas molecules can not stay for a long time, and its concentration is very small. In other words, there is a large concentration difference between the two ends of the jet interface. It is this concentration difference that causes the power source of the pumped gas to jump over the interface, disperse into the jet and be taken to the outlet. There, they are taken away by mechanical pumps.

Vacuum Pump Parts Common Failure

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Centrifugal Roots Blower Used In Cement Industry 

Knowledge of oil free vacuum pump

Oil free vacuum pump is a kind of mechanical vacuum pump which can run without any oil lubrication. The oil-free vacuum pump can only be used with the cooperation of the front stage pump. It has a large pumping speed in a wide pressure range and is not sensitive to dust and water vapor in the extracted gas. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries. 

The advantages and disadvantages of oil-free vacuum pump have the advantages of simple structure, easy operation, convenient maintenance and no environmental pollution. The oil-free vacuum pump has good durability. It is a vacuum pump, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum.

Compared with oil pump, oil-free vacuum pump has low vacuum degree and small pumping capacity, but it is small in size, easy to install, easy to maintain, convenient to move, no oil fume and no pollution to the environment, especially in the laboratory with high requirements. It is also one of the most common equipment in the laboratory.

Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the demand is high, the vacuum pump selected should be higher than the required vacuum degree. Otherwise, the vacuum pump can not meet the requirements of vacuum pumping, and the working requirements will not be met. Secondly, the pumping rate of oil-free vacuum pump should be slightly greater than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump, so special materials must be used to meet the demand.

Vacuum System In Tail Gas Treatment Unit Containing Hydrogen Chloride

Oil Free Vacuum Pump In Oil Production System

Roots Water Ring Vacuum System For Injection Pumping System  

Countermeasures for high temperature of vacuum pump

The motor power and speed are matched with the imported vacuum pump and cannot be changed. The fan is installed on the main shaft of the motor. The speed of the motor determines the speed of the fan and cannot be replaced. Although increasing the number of fan blades can play a certain role, but the dynamic balance is not easy to find after the number of blades is increased. If the alignment is not good, the motor vibration will increase. 

(1) The fan cover of the original vacuum pump was lengthened by 40cm, and an axial fan with the same diameter as the fan cover was installed inside. The motor power of the axial fan was 850W, the speed was 1489r / min, and the voltage was 380V. The original fan remains. The axial flow fan is equipped with another power supply control, and the axial flow fan is not interlocked with the main motor. Start the axial flow fan in time after starting the imported vacuum pump, and stop the axial flow fan 30 minutes after the vacuum pump stops, so as to make the main motor fully cooled.

(2) Regularly remove the dust on the vacuum pump motor, keep the motor heat sink clean and increase its heat dissipation capacity.

(3) Adjust the bus voltage of the imported vacuum pump to 400V.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Unreasonable factors of process medium injection point of vacuum pump

In front of the first flange of the vacuum pump, the temperature of the gas inhaled is 238 ℃. The distance between the first flange and the rotor of the machine is not more than 400mm, and the gas flow rate is very fast and the time is very short. To reduce the process gas from 238 ℃ to 4.8 ℃, to meet the requirements of vacuum pump inlet temperature, the process design is to add a 1-inch pipe nozzle to the pump inlet flange, and inject ethylbenzene to achieve the cooling purpose. 

The injection amount of ethylbenzene is regulated by the control valve on the pipeline. There are two problems: one is the unreasonable design of the injection point, which results in short cooling time and difficult to guarantee the suction temperature of the pump; the other is that once the control valve fails, the working temperature of the equipment will rise comprehensively, resulting in the pump failure.

In addition, before the vacuum pump is damaged, the contact wear between the rotor and the rotor and between the rotor and the shell has experienced a long time. During this period, abnormal temperature, abnormal sound and increased vibration occur. If the inspection personnel pay attention to it, the accident can also be avoided.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Influence of position and size of inlet and outlet of vane vacuum pump on noise

 According to the experiment, the closer the exhaust port is to the upper tangent point, the lower the noise is. But too close, the performance of rotary vane vacuum pump is affected. 

In production, it is found that the exhaust port is small and the noise is small, otherwise it is also large, which indicates that the size of the exhaust port has a great influence on the noise. Nanguang machine factory has unique research in this field.

They noticed that the 2x side eccentric pump has high pressure and large amount of gas when starting at atmospheric pressure. The high and low vacuum chambers are used to exhaust at the same time, and most of the gas is discharged from the exhaust valve of the high vacuum chamber. Because the size of the exhaust port of the high vacuum chamber has no effect on the noise, and can reduce the exhaust pressure, the maximum compression work and the starting power, the area of the exhaust port of the high vacuum chamber should be larger. In normal operation, the exhaust valve of high vacuum chamber is closed, and the main factor affecting noise is exhaust valve of low vacuum chamber. Therefore, the exhaust port area of the low vacuum chamber should be smaller to reduce the noise, but if the exhaust port is too small, the exhaust pressure will increase and the power consumption will increase. Therefore, the size and location of the exhaust port are selected. Although these should be considered in the design and manufacture, the maintenance personnel should also pay attention to it, so as to improve the noisy pump in maintenance.

The principle of considering the position of air inlet in design is: the suction volume should be the largest, the volume utilization coefficient should be the largest, the air resistance should be small, etc.

When repairing the pump, pay attention to whether the air inlet filter screen is blocked and whether foreign matters such as metal and glass debris fall from the air inlet, otherwise the pump chamber will be damaged.

Roots Vacuum Pump Vibration Reduction Method

Dry Screw Vacuum Pump Operation Technology

Roots Vacuum Pump Relief Valve And Bypass Pipeline

Screw vacuum pump failure

Screw vacuum pump, in the era of rapid development of vacuum, is widely used, especially in chemical, pharmaceutical, semiconductor and other enterprises. 

The influence of screw vacuum pump air compressor oil consumption meeting on the enterprise: too little screw air compressor oil will increase the wear of air compressor accessories, increase the maintenance cost of air compressor, too much screw air compressor oil, oil will overflow, at the same time, the compressed air oil content will increase, screw vacuum pump air compressor oil consumption is too much, generally the air compressor failure.

There is too much oil in the valve chamber, which may be due to the wear of valve guide, piston ring and cylinder sleeve, and the damage of sealing ring of turbocharger, which will lead to excessive oil consumption of air compressor and oil leakage of air compressor; oil leakage fault of air compressor is generally the main reason for excessive oil consumption of air compressor. Maintenance personnel of air compressor need to find out the oil leakage place as soon as possible and carry out maintenance as required.

It should be emphasized that oil leakage from the air compressor will lead to oil in the machine and other places. In order to reduce pollution, special cleaning agent should be used to clean the air compressor during maintenance, and there is too much oil in the engine. The maintenance personnel of air compressor should eliminate the surplus oil, find out the source of these oil, and use appropriate oil in the engine, and do not add too much oil leakage.


Air Ejector Structure And Working Principle

Rotary Vane Vacuum Pump For Sprinkling Irrigation On Sloping Land

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Sealing reliability and installation requirements of vacuum pump

Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment. Combine the vacuum pump correctly. Due to the selective pumping of vacuum pump, sometimes one kind of pump can not meet the requirement of air extraction. It needs several pumps to combine and supplement each other to meet the requirement of air extraction. If the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get better vacuum degree. 

Vacuum pump can not work under atmospheric pressure, need pre vacuum, some vacuum pump outlet pressure is lower than atmospheric pressure, need the front stage pump, so all need to combine the pump. Requirements of vacuum equipment for oil pollution. If the equipment is strictly required to be oil-free, all kinds of oil-free pumps should be selected, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, low-temperature pump, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti oil pollution measures, such as adding cold trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.

The vacuum pump should be installed in a solid place with sufficient space around for inspection, maintenance and maintenance. The foundation level should be kept under the base of vacuum pump. It is suggested to pad damping rubber or install with bolts at four corners of the base to ensure smooth operation and small vibration of vacuum pump.

The connecting pipe between vacuum pump and system shall be sealed reliably. Metal pipeline connection can be used for small vacuum pump, oil resistant rubber shall be used for sealing gasket, and vacuum rubber pipe can be used for small vacuum pump connection. The pipe diameter shall not be less than the suction diameter of vacuum pump, and the pipeline shall be short with few elbows. (the welding slag in the pipe should be removed when welding the pipeline, and it is forbidden to enter the vacuum pump cavity.)


Dry Screw Vacuum Pump In Gasoline Vapor Recovery In Petrochemical Industry

Claw-Type Oil-Free Vacuum Pump Concentration Operation N-Hexane Recovery

Dry Vacuum Pump In Space Simulation

Performance of oil free vacuum pump

The working principle of oil-free vacuum pump is the same as that of general positive displacement pump. It is composed of stator, rotor, rotating plate, cylinder block, motor and other main parts. The rotor with rotating blades is eccentrically installed in the stator cylinder. When the rotor rotates at high speed, the four radial sliding blades in the rotor slot divide the pump chamber into four working rooms. Due to the centrifugal force, the rotating blades are close to the cylinder wall, separating the stator inlet and outlet. The operation is repeated to change the volume and discharge the inhaled gas from the exhaust port, so as to achieve the purpose of air extraction. 

At present, there are few domestic oil-free vacuum pump manufacturers. Basically, they can only produce rotary vane vacuum pump products that must be filled with vacuum oil. Basically, the market is imported oil-free vacuum pump products. It has the advantages of simple structure, easy operation, convenient maintenance and no pollution to the environment. The two series of oil-free vacuum pumps have good durability. They are vacuum pumping, compression and dual-purpose vacuum pumps. They are basic equipment with a wide range of applications to obtain vacuum.

The oil-free vacuum pump has the advantages of convenient maintenance, easy operation, simple structure and no environmental pollution. The oil-free vacuum pump has good durability. It is a vacuum pump, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small pumping capacity, but it is small in size, easy to install, easy to maintain, convenient to move, no oil fume and no pollution to the environment, especially in the laboratory with high requirements. It is also one of the most common equipment in the laboratory. Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the vacuum degree required is high, the vacuum pump selected shall be higher than the vacuum degree required, otherwise, the vacuum pump cannot meet the requirements of vacuum pumping, and the working requirements will not be met. Secondly, the pumping rate of oil-free vacuum pump should be slightly greater than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump. Special materials must be used to meet the demand

Chemical Pressure Roots Blower

Roots Blower Impeller Wear Reason

SRR 150 Roots Blower Accessories 

What are the characteristics and applications of dry vacuum pump

Dry vacuum pump makes the working volume oil-free, so it brings many benefits. First of all, it enhances the pump's reliability. Dry pumps are not affected by water vapor or dust particles as oil seal pumps, so they are more durable and require less maintenance. Reducing oil consumption also means reducing the cost of serious disposal of oil. The use of dry vacuum pumps also reduces the possible contamination to a smaller level, which may be present in the oil - affecting the performance of the pump, or in some extreme conditions. 

At present, most of the dry vacuum pumps used in the vacuum industry use oil, water or other polymers as the working medium of the pump, which plays a variety of functions such as cooling, sealing and smoothing in the pump. With the development of science and technology and the expansion of vacuum application scope, the original dry vacuum pump and its pumping system present two urgent problems: one is the backflow of the working medium of the pump pollutes the pumped container, which affects the quality and quantity of products in many cases, and increases the maintenance cost of equipment. Secondly, due to the reaction material in some process, the medium in the vacuum pump is seriously degenerated, so that the pump can not work normally.

As for the common oil-free vacuum system, although the oil sealed vacuum pump and the accessories such as cold trap or adsorption trap can be used to avoid backflow, it can not completely deal with the problem and make the system complex. The application of appropriate type of dry vacuum pump can achieve the ideal application effect.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Wear of screw pump

Screw pump is a positive displacement rotor pump, which depends on the volume change of sealing cavity formed by screw and bushing to absorb and discharge liquid. Screw pump is divided into single screw pump, double screw pump, three screw pump and five screw pump. Screw pump is characterized by stable flow, small pressure pulsation, self-priming ability, low noise, high efficiency, long service life and reliable operation; and its outstanding advantages are that it does not form eddy current when conveying medium, is not sensitive to the viscosity of medium, and can transport high viscosity medium. 

Each kind of plastic has an ideal plasticizing processing temperature range, and the barrel processing temperature should be controlled to make it close to this temperature range. Granular plastics from the hopper into the barrel, first will arrive at the feeding section, in the feeding section will inevitably appear dry friction, when these plastics are not heated enough, melting uneven, it is easy to make the barrel wall and screw surface wear increased. Similarly, in the compression and homogenization section, if the melting state of the plastic is disorderly and unevenly, the wear will be accelerated.

The speed should be adjusted properly. Because some plastics are reinforced, such as fiberglass, minerals or other fillers. The friction force of these substances on metal materials is often much greater than that of molten plastics. In the injection molding of these plastics, if the high rotational speed is used, the shear force on the plastic will be increased, and the reinforcement will correspondingly produce more torn fibers. The torn fibers contain sharp ends, which greatly increase the wear force. When inorganic minerals slide on the metal surface at high speed, its scraping effect is not small. Therefore, the speed should not be adjusted too high.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Cavitation of centrifugal pump

Centrifugal pump is widely used in petrochemical, metallurgy, water conservancy, electric power, nuclear power and other industrial fields. It carries out power transmission for liquid medium in various production devices. Its performance reliability plays a very important role in the normal operation of the device. Cavitation is an important phenomenon in the operation of centrifugal pump. It is the most common problem that affects the reliability and service life of centrifugal pump. At the same time, it is also a huge obstacle to the development of large flow and high speed. Therefore, cavitation has become an important topic in the current pump research.

Cavitation is a kind of liquid dynamic phenomenon. The basic reason of cavitation is that the local pressure drop occurs in the process of liquid flow, forming a low pressure area. According to the knowledge of physics, for a certain liquid medium, at a certain temperature corresponding to a certain saturated vapor pressure PV, when the pressure of the medium is less than PV, vaporization will occur. When the centrifugal pump is running, after the medium enters the pump suction port, the pressure is gradually reduced before the impeller does work on the medium. When the pressure is reduced to the saturated vapor pressure at the corresponding temperature, the medium will boil and vaporize, making the original flow medium appear a large number of bubbles. The bubbles contain the steam of the conveying medium and the air originally dissolved in the medium. When bubbles flow from low pressure area to high pressure area along with liquid flow, the pressure of medium rises rapidly due to the work done by the rotating impeller. When the pressure is greater than the saturated vapor pressure PV at the corresponding temperature, the bubbles will condense again into liquid phase, and a large number of holes will be formed instantly, and the surrounding liquid medium will rush to the holes at high speed and collide with each other, making the local pressure at the hole increase sharply 。 This kind of liquid hammer is a kind of impact with high strength and high frequency. Its pressure can reach hundreds of atmospheres and the frequency of water hammer is as high as 25000 times / s. The fatigue failure of the material wall is gradually produced due to the repeated load with such high frequency and high pressure.

Under some working conditions, there may be active gases (such as oxygen) dissolved in the pumping medium. With the help of the medium, a large amount of heat will be released when the gas phase condenses into the liquid phase, which will produce electrochemical corrosion on the metal, accelerate the corrosion damage speed, and cause pitting, perforation and even fracture on the metal surface. The phenomenon of liquid-phase medium vaporization, condensation and impact in the pump, resulting in corrosion and damage of metal materials, is called cavitation of centrifugal pump.


CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump