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.

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Screw vacuum pump shaft holding problem

Analysis of screw vacuum pump is easy to present another situation, about the presentation of shaft holding problem, perhaps it is the first time to hear this word, do not understand the meaning of the beginning, is not the vacuum pump is not running? There are many reasons for this phenomenon, the following will be a systematic analysis of the reasons for this situation, which may be helpful for future use. 

The problem of screw vacuum pump shaft holding mainly starts from bearing components. The reasons are as follows: the quality of bearing itself is different, or the wear and aging formed in long-term operation; and then, in the assembly process, the bearing positioning and design requirements are very different, positioning is not accurate, the selection of components is unreasonable, and the quality of smooth oil is also related to the occurrence of this situation If the overall vibration of the pump is too large, it is also the cause of the attack.

The reasons described above are the problems of screw vacuum pump shaft locking phenomenon. The application unit can judge which component is formed according to these conditions, so as to make up for it in a short time.

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Vacuum pump in high tech industry

Now in the vacuum profession, the oil-free vacuum pump with good cleanliness and high vacuum degree is paid more and more attention by various professions. In China, the development of this process is still in its infancy, and the demand for practice is constant. 

For example, more than 70% of the vacuum industry in Japan is used in semiconductor and liquid crystal display (LCD) industries. The traditional vacuum system can not meet the requirements of cleaning, oil-free and corrosion resistance. Therefore, molecular pumps and cryogenic pumps in dry vacuum pumps in Japan are developing rapidly. At present, vacuum products have been updated, and many oil vacuum systems have been replaced by oil-free and clean vacuum systems.

From the proportion and trend of various types of vacuum pumps in China, it can be seen that the vast majority of vacuum industry in China is concentrated in the general traditional vacuum application, so the high vacuum system is still dominated by lax pumps, while the low vacuum and front stage vacuum are mainly rotary vane vacuum pumps and sliding valve pumps. The production of turbo molecular pumps is the smallest. Large or composite molecular pumps do not form batch production. As for low-temperature pumps and various types of dry vacuum pumps, they are just in the beginning, unable to meet the needs of semiconductor industry and LCD industry.

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Precautions for purchasing oil-free vacuum pump

Now technology drives the innovation of products, and the performance of oil-free vacuum pump products has been greatly improved, which is loved by many industries. However, when purchasing oil-free vacuum pump, we can not choose manufacturers at will. What should we pay attention to when purchasing oil-free vacuum pump? 

Generally, the limit vacuum degree of the pump is 0.5 to 1 order of magnitude higher than that of the vacuum equipment. Correctly select the operating point of oil-free vacuum pump. Each type of pump has a fixed operating pressure range, such as: 2BV series oil-free vacuum pump operating pressure range of 760mmhg ~ 25mmhg (absolute pressure). In such a wide pressure range, the pumping speed of the pump varies with the pressure (refer to the function curve of the pump for detailed changes), and its stable working pressure range is

Therefore, the operating point of the pump should be selected in this range rather than long-term operation under 25 ~ 30mmhg. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small air extraction capacity, but it is small in size, simple in installation, simple in maintenance, easy to move, does not pollute the environment, does not produce lampblack, especially in the laboratory with higher request. It is also one of the equipment in the laboratory.

Therefore, when purchasing the oil-free vacuum pump, the vacuum degree of the request should be confirmed first. If the demand is high, the vacuum pump selected should be higher than the vacuum degree required, otherwise, the vacuum pump can not reach the request of vacuum pumping, and the work request will not be reached. The other is the pumping rate of oil-free vacuum pump, which is slightly higher than the required pumping rate, so as to better meet the demand. Finally, we can see whether the extracted gas is corrosive or not. If the corrosive gas is corrosive, it is necessary to use special materials to meet the demand.

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Judgment method of screw vacuum pump

Dry screw vacuum pump is a new type of vacuum pump, which is developed to replace the traditional water ring vacuum pump, oil ring vacuum pump and other pump types. Because of its unique design principle, it can be oil-free and water-free, and can be used as corrosion-resistant coating. The excellent sealing design will far exceed the performance of traditional vacuum pump in any aspect. 

How to judge whether the dry screw vacuum pump is qualified can be judged from the following aspects:

1. Limit vacuum degree: of course, the lower the limit vacuum, the better. At present, the domestic one is about 5pa, while the imported one is about 1pA.

2. Vibration and noise: vibration must be small, noise must be less than 80 dB. 

3. If it is used in a corrosive environment, it is better to ask the manufacturer for a sample of the same coating, and put it in the factory for a test. If the coating or coating ratio used by each manufacturer is different, its performance will be greatly different.

4. Sealing: This is also very important, but we can only learn from the manufacturer's instructions. The most direct way is to determine whether there is leakage through the medium after connecting to the system.

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The material transportation uses the jet device

At present, pneumatic jet, a kind of powder conveying device, has appeared in the market, and how powerful its claimed function is. The principle of its use is to use the "Venturi principle" jet principle to drive the flow of high-pressure gas in the pipeline to form a vacuum, so that powder can be sucked. 

However, the application of the jet device has low vacuum degree, low material suction height, high gas consumption and low efficiency. 

The water ring vacuum pump is very practical in material transportation. Many people do not understand the installation points of water ring vacuum pump and the requirements of material pipeline. Through collecting the actual requirements of users, a variety of water ring vacuum pump material transportation systems are designed, which are simple, convenient, environmental protection and fully adapt to the needs of material transportation in various industries.

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Principle of dry vacuum system in steel production

Steam jet pump was used as vacuum equipment in the production of high quality steel, which was also widely used in the world at that time. Its biggest disadvantage is high operating cost, large steam consumption and high energy cost. And every time before the formal use must try to pump a few heats to achieve the vacuum degree, just cleaned up the tank situation is more serious. In addition, due to the influence of superheated steam quality fluctuation, it is difficult to control the system working state and process stability. 

Due to the disadvantages of steam jet pump vacuum system, such as high energy consumption and large maintenance, the vacuum system composed of dry mechanical pump has been widely concerned. Among them, yazhilaide electric and Mechanical Co., Ltd. reformed the original steam pump group, and the dry vacuum pump was used to save electricity by 95%, and the maintenance free was realized. The results show that the time for the mechanical pump to reach the deep vacuum is less than 5 min, and the mass fraction of the treated molten steel is less than 0.00025%. The process effect can fully meet the requirements of high quality steel production specification including high quality heavy rail steel. 

Most mechanical vacuum pumps used in 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, lubricating and so on. With the development of science and technology and the expansion of vacuum application field, there are two urgent problems to be solved in the original mechanical vacuum pump and its pumping system: first, the backflow of the working medium of the pump pollutes the pumped container, which in many cases affects the quality and quantity of products and increases the maintenance cost of equipment. Secondly, due to the reaction material in some process, the medium in the vacuum pump is seriously deteriorated, so that the pump can not work normally.

For the ordinary oil-free vacuum system, although the oil sealed vacuum pump and the accessories such as cold trap or adsorption trap can be used to prevent backflow, it can not completely solve the problem and make the system complex. The ideal effect can be achieved by using a proper type of dry mechanical vacuum pump.

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Simulation calculation of cavity clearance in twin screw vacuum pump

The temperature field distribution and deformation of the two rotors are obtained by loading the first and third kinds of thermal boundary conditions, as well as the force and displacement boundary conditions. The results show that the radial deformation of the rotor is different among different stages. Therefore, this paper makes detailed requirements for the clearance in the vacuum pump cavity, and carries out calculation. 

In the working process of screw vacuum pump, the rotor will have thermal deformation, so appropriate clearance should be reserved in the rotor manufacturing process. If the clearance is too small, the deformation is easy to cause the rotor to get stuck; if the clearance is too large, the screw vacuum pump cannot obtain a higher vacuum degree. Therefore, the calculation of clearance is very important.

At present, most of the related literature at home and abroad is focused on screw compressor, and relatively few literatures about screw vacuum pump have not made specific calculation on the clearance.

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Maintenance of vacuum pump oil mist separator

When you use the imported vacuum pump oil mist separator, you must pay attention to the cleanliness of the environment around the separator, so as to ensure the normal operation of the product. If there is a problem in the process of use, we should first know how to solve the problem, and also pay attention to the matters needing attention in the maintenance process 

First of all, we should consider that when disassembling the oil mist separator of the imported vacuum pump, we should observe the cleaning condition of the surrounding area, which may cause the separator to be polluted again due to our neglect. This will not only play a good role, but also make the situation worse. Therefore, it is necessary to take a look at the surrounding sanitation before disassembling.

What's more, when we dismantle the separator, we should handle it with care. As we may all know, the separator is made of very crisp materials. If we don't pay attention to it, it will break the separator. We just need to follow the strict disassembly and assembly.


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Detailed introduction of imported scroll pump

Vortex pump is also called vortex pump, regeneration pump, etc. Because it is by the impeller rotation when the liquid vortex motion and suction and discharge of liquid, so called vortex pump. According to different types of vortex pump, it can be divided into single-stage vortex pump, centrifugal vortex pump, stainless steel vortex pump and other vortex pumps.

At present, the flow rate of general vortex pump is 0.2 ~ 27m3 / h. The working principle of general vortex pump is that when the prime mover drives the impeller to rotate in the pump through the shaft, the liquid enters the flow channel by suction, and is thrown into the annular flow channel by the centrifugal force of the rotating impeller, making the liquid rotate in the flow channel. Because each liquid particle is affected by centrifugal force, the liquid inside the impeller is greatly affected by the centrifugal force, while the liquid in the flow channel is less affected by the centrifugal force. Due to the different centrifugal force, the liquid will make longitudinal vortex motion. The liquid circulates through the channels between the blades repeatedly by means of longitudinal vortices (Fig. 1-35). Each time the liquid passes through the passage between blades, the lift is increased once, and finally the liquid is pressed out and discharged. 

After the liquid is discharged, a local vacuum will be formed in the channel between the blades, and the liquid will continuously enter the impeller from the suction inlet and repeat the above motion process. In this way, the vortex pump suction liquid, while discharging liquid, so as to continue to work. From the working principle of general vortex pump, we can see that it is like the role of multi-stage centrifugal pump, each blade channel is equivalent to one stage, and the energy increases once the liquid passes through the channel. Therefore, the head of general vortex pump is 2-5 times larger than that of centrifugal pump under the same impeller diameter, so it is a kind of pump with high head and small flow. Compared with the centrifugal pump with the same performance, the vortex pump has small volume and light weight; compared with the positive displacement pump with the same head, its size is much smaller and its structure is much simpler. Therefore, the general vortex pump has the advantages of simple structure, compact, small volume, light weight and low cost.

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Causes of cavitation in centrifugal pump

Centrifugal pump is widely used in industry and daily life because of its simple operation, stable operation, high cost performance and easy maintenance and care. However, mechanical equipment, after a long time of continuous work, it is inevitable that equipment damage and failure problems, centrifugal pump cavitation phenomenon is one of the common faults of centrifugal pump.

Once cavitation occurs in the pump, its flow and head performance will not only decline, but also show obvious high noise and vibration. In serious cases, the liquid flow in the pump will be interrupted and can not work normally. Cavitation will also damage the flow passage parts of the pump, and even affect the pipeline system.

There are many reasons for cavitation phenomenon, such as centrifugal pump product quality problems, improper use of operators and so on. Before leaving the factory, the product will go through multiple procedures of quality inspection, so the influence ratio of human factors is greater. In the working state, the working environment and operating factors of centrifugal pump account for the vast majority of the proportion of centrifugal pump cavitation phenomenon.

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Gas drainage by vacuum pump / compressor

There are several basic forms of gas drainage by imported vacuum pump / compressor 

According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the imported vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. At present, the imported vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.

The drainage method is divided into: drilling drainage, drilling coal seam, and using loosening technology to increase the release area and conduction of coalbed methane, so as to make the rapid release of coalbed methane. Reduce the release in the process of excavation. This method has good effect and high utilization rate of coalbed methane. Generally, imported vacuum pump / compressor is used for pumping. Roadway method drainage, the goaf roadway, mining roadway gas drainage, to ensure the safe concentration. It includes surface vertical well pumping, mixed pumping, etc.

The target layers of electric drainage include: extraction from mining layer, drainage from adjacent strata, drainage from goaf, etc. The technology of gas drainage is to set up a gas pumping station on the ground and connect with the drainage borehole through the underground gas drainage pipeline system. When the pump is running, it will cause negative pressure, and the gas will be pumped out into the gas tank or directly supplied to the user. If the amount of gas extracted is small or unstable, it can be directly discharged into the atmosphere.

According to the specific location and layout of the mine excavation, the imported vacuum pump station is generally set on the ground (underground). The enclosure (shed) of the gas drainage room should ensure that there are no residents within 50m around the gas drainage room, no open fire within 20m, no inflammable and explosive materials, and four dry powder fire extinguishers and no less than 0.5m ~ yellow sand are installed.

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Electromagnetic vacuum belt charging valve

The electromagnetic vacuum belt charging valve is installed on the vacuum pump to prevent the pump oil from returning, thus avoiding the pump oil from polluting the vacuum chamber. The valve can be sealed in positive direction, but not in reverse. 

When the solenoid valve is closed or suddenly cut off, the pilot valve inflates the upper cylinder chamber, and automatically closes the vacuum system according to the atmospheric pressure difference, and then fills the pump chamber with atmosphere. When the valve is powered on, the pilot valve cuts off the atmosphere and connects the upper cylinder to make the vacuum pump pump pump pump air to the upper cylinder. The piston is pushed by the spring force to open the valve plate. The vacuum pump normally vacuumizes the vacuum system. When there is no pressure difference on both sides of the valve plate, the valve can not be used, and the valve plate is in swimming state. It should be noted that the installation height of the valve should be more than 1000mm higher than the suction port of the vacuum pump, so as to avoid direct impact on the valve core channel due to the return oil of the pump.

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What is the working principle of hydraulic ejector

Hydraulic ejector has double functions of vacuumizing and condensing secondary steam. It is a vacuum unit composed of nozzle, suction chamber, conical guide baffle, mixing chamber, throat, diffusion pipe and inlet pump. 

The hydraulic ejector uses the pressure of the water pump to put water into the nozzle. The water pump adopts 3k-9 water pump in series, or uses five-stage centrifugal pump. The flow of the pump must meet the demand of secondary steam cooling water. Its head must also meet the requirements of water inlet pressure of hydraulic ejector. When the water with a certain pressure passes through the nozzle with small cross-section area, a high-speed jet of 15-30 M / s will be produced at the nozzle outlet. After a certain distance, the jet water will converge on the same focus accurately. Due to the increase of kinetic energy at the nozzle outlet, the potential energy at the nozzle outlet will be reduced, resulting in a certain negative pressure. The secondary steam will be continuously sucked in to cool it with the top entry The water is in direct contact with cross flow, and carries out strong heat and mass exchange, which makes the secondary steam condense into liquid, and makes its volume decrease rapidly. Thus, a certain vacuum degree is obtained and the concentration process can be carried out smoothly. At the same time, the non condensing gas is pumped out by the high-speed jet beam and discharged out of the system through the throat, diffusion pipe and discharge pipe.

When installing a hydraulic ejector, the lower end of the discharge pipe does not need to be immersed in the water layer of the water tank. The water seal formed when the lower end extends into the water can not overcome the phenomenon of backflow of cooling water, on the contrary, it will only increase the backflow of cooling water. The hydraulic jetting apparatus has double functions, no need to install vacuum pump and water pump. It has simple structure and convenient operation. There is no mechanical operation part, high efficiency, less energy consumption than other types, but more water consumption, and a certain degree of cleanliness of cooling water is required, otherwise the nozzle is easy to be blocked.

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vertical oilless reciprocating pump characteristics

The vertical oil-free reciprocating pump is the substitute product of horizontal reciprocating pump. Compared with the horizontal reciprocating pump, it has the following characteristics: high vacuum degree, energy and water saving, vertical arrangement of cylinder, compact structure, convenient maintenance and small floor area; especially, it improves the disadvantages of horizontal reciprocating pump due to the sag of piston weight and uneven friction. 

PTFE piston ring and packing seal ring with good self-lubricating performance are designed for vertical oil-free reciprocating pump, which can reduce the wear of moving parts and is suitable for less oil lubrication or no oil lubrication. In order to improve the reliability of the pump operation, a gear oil pump is set on the non driving side of the crankshaft to force lubrication on the big and small end bearings of the connecting rod.

The service life of piston ring, packing, valve and other key components of oil-free vertical reciprocating pump is 1.5 ~ 2 times of W series reciprocating vacuum pump. The floor area is about 1 / 2 of the horizontal reciprocating pump. The pump is a double acting cylinder. It can be either single-stage pumping (high pumping rate) or double-stage (high vacuum) structure, which is conducive to the modification of the pump to meet the needs of different customers.

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Working principle of oil sealed vacuum pump

The mechanical vacuum pump, which uses vacuum pump oil to keep the seal of moving parts and realizes pumping by changing the volume of pump chamber, is called oil sealed mechanical vacuum pump. 

The working principle of oil sealed mechanical vacuum pump is to make the volume of pump chamber chamber increase and decrease mechanically and pump air. When the volume of the working chamber in the pump chamber becomes the minimum, it is connected with the inlet pipe of the pump, so the gas enters into the suction chamber of the pump until the volume of the suction chamber is maximum and is separated from the air inlet again. When the volume is reduced, the gas is compressed until the pressure of the gas is greater than one atmospheric pressure, and the exhaust valve is opened to discharge the gas. This completes the whole pumping process of oil sealed mechanical vacuum pump.

At present, a large number of mechanical vacuum pumps are widely used, even if the design is the best, the matching accuracy between parts moving in opposite direction is very high. When the pump reaches the limit vacuum, it is difficult to prevent the gas from the low vacuum end to the inlet end. In addition, due to the harmful space in the design, manufacture and assembly of the pump, it also reduces the limit vacuum degree of the pump.

Oil sealed mechanical vacuum pump is to seal the opposite moving parts and exhaust valve parts with oil to fill the harmful space, so that the chances of high-pressure gas reverse "breakthrough" are much less, and the sealing performance is much better, so that the pump can achieve a higher vacuum degree.

Oil sealed rotary mechanical vacuum pump can be divided into fixed plate vacuum pump, rotary vane vacuum pump, slide valve vacuum pump and cycloidal vacuum pump. At present, the mechanical vacuum pump with oil seal is the most widely used pump in domestic vacuum acquisition technology. It can be used as the exhaust pump of low vacuum equipment alone, or as the front stage vacuum pump for high vacuum exhaust. At present, rotary vane vacuum pump is the most popular mainstream product.

Therefore, it has been playing an increasingly important role in many sectors of the national economy, such as electric vacuum, electronics, light chemical industry, iron and steel, nonferrous smelting and other industrial sectors. As these pumps are equipped with gas ballast device, it can also pump out the wet gas. However, it is not suitable for pumping out gases with high oxygen content, explosive, corrosive to ferrous metal, chemical action on pump sealing oil, and gas containing particle dust.


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What are the characteristics of oil-free vacuum pump

The ambient temperature of oil-free vacuum pump should be less than 40 ℃ and the temperature rise of motor should not exceed 75 ℃. After 1000 hours of normal operation of the magnetic pump, the bearing and end face moving ring shall be disassembled and inspected for wear, and the wear parts that can not be reused shall be replaced. For the medium that is easy to precipitate and crystallize, the conveying liquid shall be cleaned immediately after use to drain the liquid in the pump. The vacuum pump should always be kept clean, no other objects should be placed on the vacuum pump, and the channel around the pump should not be blocked for better maintenance and operation. 

Oil free vacuum pump is widely used in vacuum distillation, evaporation, crystallization, drying and filtration in petroleum, chemical, food, pharmaceutical and other fields.

Due to the selective pumping of oil-free vacuum pump, sometimes one kind of pump can not meet the requirements of air extraction, and several pumps need to be combined to supplement each other to meet the pumping requirements. For example, the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the three type sputtering ion pump has a certain pumping speed for argon. The combination of the two will make the vacuum device have a good vacuum degree. In addition, some vacuum pumps can not work under atmospheric pressure and need pre vacuum; some vacuum pump outlet pressure is lower than atmospheric pressure, need front pump, so all need to combine the pump.

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Electric mode of electric diaphragm pump

In real life, the use of electric diaphragm pump is also relatively common. In many occasions, the diaphragm pump with electric characteristics will be used. It breaks the traditional application mode, has certain electric performance and automation performance, and is very small in volume, especially light in weight, and easy to move and install. It has no complex control system, and there is no computer and fuse wait.

This ensures its safety. The diaphragm pump can be used in various industries, such as chemical industry, petroleum industry, coating industry, daily chemical industry, mining industry, water treatment industry and food industry. And in the modern furniture industry and metallurgical casting industry can also be used, without any negative impact.

And this kind of electric diaphragm pump can always maintain a high efficiency, not because of wear and tear and reduce its use efficiency, do not need lubricating oil for lubrication, its maintenance is very simple and convenient, there will be no dripping pollution of the working environment.

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Centrifugal pump technology

Centrifugal pump is the main production products, it includes stainless steel centrifugal pump, stainless steel chemical centrifugal pump, single-stage centrifugal pump, horizontal multi-stage centrifugal pump and other centrifugal pumps. To really understand the centrifugal pump, we must first understand the principle of centrifugation. Centrifugation is actually a manifestation of the inertia of any object. Centrifugal pump is precisely using this principle to work. When the pump is in operation, the pump body and inlet pipe are filled with water, forming a vacuum state. When the impeller rotates rapidly, the water will be thrown out quickly because of the centrifugal force; when the impeller continues to rotate, the water source will be continuously pressed into the penstock under the action of water pressure, maintaining the circulation state, and finally realizing continuous pumping.

In recent years, the development of domestic centrifugal pump is expected, and the speed of development is also amazing. However, behind the rapid development, there is a natural problem that can not be ignored is that domestic enterprises are busy with the development of enterprise economy, which makes this industry hover in the middle and low level, and has not been able to surpass. In this regard, the development direction of centrifugal pump is very obvious, that is to change the current weak state, so that domestic pump development to a new level.

According to the current development trend, centrifugal pump will continue to be used in many fields and industries in the future, among which the most important are environmental protection industry, water conservancy field, power station, petroleum and petrochemical industry, agricultural water conservancy construction, etc. Environmental protection industry is widely used, sewage treatment plant, industrial wastewater treatment device all use centrifugal pump, make water resources treatment more convenient. In addition, the use of centrifugal pump in petroleum and petrochemical industry is particularly prominent, which has already become an important field. Without centrifugal pump, it is almost impossible to walk.

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Causes and solutions of overheat of screw pump motor

If the screw pump motor is too hot and overloaded, the cause of the pump motor scalding may be that the fluid viscosity is too high (that is, higher than the viscosity value set when selecting and designing the pump). Obviously, the higher the operating pressure, the greater the power required, because all rotary pumps produce the same flow rate per revolution of the shaft (i.e. at a given pump speed, the power consumption is directly related to the differential pressure). The mismatched fluid may cause rubber swelling, increase the interference fit between stator and rotor, and increase the torque and power consumption.

In the transmission process, when the transmission distance is very long and the pipeline friction loss is large, the screw pump must do extra work to overcome the high pressure difference.

More stages are required because the design differential pressure for each stage is 75 psi (lower if the abrasive content is high). Too long screw pump will lead to processing problems. However, even if the processing problem is not considered, a very long rotor will become soft and prone to sagging in the middle, resulting in excessive interference with the rubber bushing, resulting in overheating and failure (falling off). Sometimes several pumps may be used. One pump pumps the fluid to an open storage container in the middle, and the next pump starts pumping from here. This will ensure that the inlet pressure of all pumps is the same and will not increase. The solution of screw pump is to increase the motor speed and reduce the motor power.

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