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. The calculation results provide a theoretical basis for the determination of the cavity clearance of the twin screw vacuum pump.

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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Roots vacuum pump as booster pump

As one of the vacuum pump series, roots vacuum pump is widely used in the chemical and pharmaceutical industries. As a booster pump, roots vacuum pump is one of the main products of our company, and its wide range of application is favored by customers.

The pressure of hydraulic system of Roots vacuum pump is not adjusted properly, resulting in system heating. Roots vacuum pump hydraulic system is generally high pressure and large flow system. The introduction of Roots vacuum pump into PLC greatly improves the reliability of electrical system. At the same time, the pressure of Roots vacuum pump and the working conditions of each system should be observed. After all systems work normally, the roots vacuum pump can be pumped continuously as much as possible. The piston of concrete cylinder should be kept running at the maximum stroke, so as to give full play to the maximum efficiency of Roots vacuum pump and make the concrete cylinder wear evenly in the length direction The pressure is too high and unstable, and the oil temperature rises. In case of pipe crown vibration and pumping difficulties, it is not allowed to pump by force, but the causes should be found out immediately to eliminate them. From the investigation of the use of fine aggregate concrete pump, it is found that the temperature of the hydraulic system of many types of Roots vacuum pump can be as high as 60E after using for about 40min, and the thermal equilibrium temperature of the hydraulic system can be as high as 70E after using for about 2h, while the normal thermal balance temperature of the hydraulic system of Roots vacuum pump should be about 50E. Therefore, the oil temperature of Roots vacuum pump hydraulic system is too high, that is heating problem.

In Roots vacuum pump hydraulic system, due to the performance requirements, the system is often equipped with safety valve, overflow valve and sequence valve. If the pressure of the safety valve is adjusted too low, the safety valve will open frequently, resulting in overflow loss and system heating; if the pressure is adjusted too high, the leakage in the system will increase and the system will heat up. Therefore, the safety valve and pressure value should be calculated and adjusted correctly according to the load requirements of the hydraulic system, so as to ensure that the system works within the specified pressure range. The elbow of the delivery pipe can be knocked with a mallet first. Conical pipe and other parts, and slow pumping or reverse pump to prevent blockage. In hot summer, wet straw bags should be used to cover the pipeline to prevent the concrete from collapsing too fast and blocking the pipe during the pumping process. However, no matter what type of pump, its executive components are the same, including the main delivery cylinder, distribution valve swing cylinder and mixing motor, and the cylinder reversing is controlled by the on-off and travel switch (or proximity switch) of the corresponding solenoid valve.


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Roots Vacuum Pump

Composition of vacuum system

What are the main components of a complete vacuum system? There are many kinds of vacuum system equipment, but no matter which kind of vacuum application equipment, there is a set of exhaust system to sweep the gas in the vacuum container, so as to obtain the vacuum condition in the vacuum container. For example, the container used for vacuum disposal is connected to the vacuum pump through pipes and valves. When the vacuum pump empties the container, there is a vacuum measuring device on the container, which constitutes a simple vacuum pump system.

A simple vacuum system can only obtain vacuum in a low vacuum scale in a pumping vessel. When high vacuum scale vacuum is needed, high vacuum pump is usually connected with vacuum system in series. When the high vacuum pump is connected in series, the valve is usually added at the outlet and outlet of the valve.

High vacuum pump to adhere to the vacuum. Assuming that the high vacuum pump in series is an oil dispersion pump, in order to prevent a lot of oil vapor flow back to the pumping container, a drain valve and water cooling baffle are added at the outlet of the oil dispersion pump. According to the requirements, dust remover, vacuum relay head, vacuum soft connection, exhaust valve at the outlet of vacuum pump can be used in the pipeline to form a more perfect high vacuum system.

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Application performance of Roots vacuum pump

Based on the current overall application ability of Roots vacuum pump, on the basis of fully doing the actual performance of the product, we should promote the overall application ability of the product to a higher advantage development through the advantage of development. Under the premise of increasing the promotion of the basic ability of the product, we should take the development advantage of the product's technical performance as the overall driving force to provide effective ability On the basis of strength advantages, we should drive the overall development of roots pump, promote the continuous promotion of its superior performance, and do a good job in driving the application effect of products.

In order to speed up the development of Roots vacuum pump, in terms of the application effect of various aspects of the market, gradually improve the driving force of all aspects of the product application ability, increase the favorable promotion of the product applicability, expand the overall driving force of its functional development, play the promotion of various product capabilities with strong application advantages, and fully complete the overall application of basic products In the effect embodiment, through the continuous favorable promotion of its technology, the promotion of the product application ability can be brought into full play.

The performance expansion of Roots vacuum pump has a continuous promotion effect on the overall utilization rate of the product. In the process of increasing the application effect of the product, promoting the application performance of all aspects of the product with a greater development advantage will drive the actual promotion of the product application ability.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump

Installation and operation steps of chemical centrifugal pump

Chemical centrifugal pump refers to the centrifugal pump used in the chemical field. Compared with other types of pumps, chemical centrifugal pump has the advantages of simple structure, not easy to wear, stable operation, low noise, uniform water outlet, convenient adjustment and high efficiency, so chemical centrifugal pump has been widely used.

The key to the installation technology of chemical centrifugal pump is to determine the installation height (i.e. suction head) of chemical centrifugal pump. This height refers to the vertical distance between the water surface of the water source and the center line of the impeller of the chemical centrifugal pump. It can not be confused with the allowable vacuum height. The allowable suction vacuum height on the chemical centrifugal pump product manual or nameplate refers to the vacuum value on the water inlet section of the chemical centrifugal pump, and is measured by test under 1 standard atmospheric pressure and water temperature of 20 ℃ Yes. It does not take into account the water flow condition after the matching of the suction pipe. The installation height of chemical centrifugal pump should be allowed to absorb the vacuum height, after deducting the loss of suction pipe head, the remaining part of the value, it should overcome the actual terrain suction height. The installation height of chemical centrifugal pump should not exceed the calculated value, otherwise, the chemical centrifugal pump will not be able to pump water.

The working principle of chemical centrifugal pump is that when the pump is full of water, the impeller rotates to produce centrifugal force. The water in the impeller channel is thrown out and flows into the pump shell under the action of centrifugal force, so the pressure at the center of the impeller decreases, which is lower than the pressure in the water inlet pipe, and the water flows into the impeller from the suction tank under the effect of this pressure difference. In this way, the pump can continuously absorb water and supply water continuously.

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Vacuum pump system in beer process

In fact, we often drink beer before the final cover, also need to use the vacuum pump system for vacuumizing, mainly used in the wine filling process, and the vacuum requirements are higher. Before, one user selected 2bv5110 water ring vacuum pump of our factory, each with a power of 4kw. In the production process, the start-up of six water ring pumps was incremental (one by one). Therefore, the pump set can operate normally only when the technical conditions of the six water ring pumps are good. Since 2001, the vacuum pump unit has had frequent failures, such as insufficient vacuum degree and tripping of vacuum pump motor. Up to August 2002, we have purchased 9 vacuum pumps and 8 sets of mechanical accessories (including pump blades, distribution plates, mechanical seals, etc.) and repaired the rotor shaft of the motor for many times. The vacuum degree is only - 0.06mpa, which can not meet the production requirements of -0.085mpa, which seriously affects the quality and production efficiency of beer.

After careful analysis and demonstration, a 2BE1 series water ring vacuum pump (Power: 18kw, pumping rate: 600m3 / h) was used instead of the original vacuum pump group, and vacuum protection, water shortage protection, cavitation prevention device and water saving device were installed to ensure the high efficiency, energy saving and long-term reliable operation of the vacuum pump. In order to prevent the air and working fluid from flowing back to the vacuum pump system due to sudden shutdown and other reasons, a check valve is installed in the intake pipeline.

After the improved vacuum pump system was put into production, there was no fault, and the vacuum degree was kept at 0.084-0.092mpa. The water and electricity consumption of the vacuum pump has decreased obviously.

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Roots Vacuum Pump

Material requirements for vacuum system

The materials used in vacuum pump system mainly refer to vacuum pipeline system, valve and sealing material, etc. the materials of vacuum pipeline system include metal, rubber and glass, which have their own characteristics. The type of material to be used depends on the specific situation. The connection between the pipe and the vacuum components can be welded, welded and flanged. The valves in the system are divided into metal valves and glass vacuum taps Species. The sealing materials commonly used in vacuum system include vacuum sealing oil, vacuum sealing wax, vacuum sealing mud, vacuum paint and epoxy resin

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

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Causes and repair of shaft damage of water ring vacuum pump

At present, the shaft and impeller of water ring vacuum pump are all in one-stage dynamic fit, and there is no 0-type sealing ring at the keyway. The liquid in the pump (especially when the corrosive liquid is used as liquid ring in chemical industry) will enter the shaft hole through the fit clearance and keyway, which will corrode the shaft hole of the shaft and impeller, and greatly reduce the fatigue strength. The increase of fit clearance after corrosion and wear (some of which are ground into elliptical shaft holes) not only affect the performance, but also aggravate the vibration and promote fatigue fracture.

The general water ring vacuum pump shaft has not been heat treated, so the fatigue strength is low. In order to prevent fracture, the pump shaft should at least be quenched and tempered, and nitriding treatment should be carried out where conditions permit.

In the design, it is necessary to avoid large section mutation. Fillet connections are applied instead of sharp corners at the transition. The surface finish should not be low, especially in the place where the shaft is easy to break. During the processing, the circumferential machining of the transition parts of different shaft diameters should ensure the quality, and the size and smoothness required by the drawings should be strictly followed. There should be no knife marks, scratches, bumps and other defects on the surface and transition of the pump shaft.

The fatigue damage of pump shaft is very harmful to production, which is a problem of great concern to users. The solution is: according to the size of radial force to check the fatigue strength of the pump shaft, when using corrosive gas and liquid ring, the corresponding corrosion-resistant materials should be used, the pump shaft must be quenched and tempered, and the quality must be guaranteed during processing.

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Main uses of water jet pump

① It is used in vacuum distillation, concentration, dehydration, decolorization, drying, crystallization, filtration, degassing, material transportation, tail gas and dust absorption in chemical and pharmaceutical industries.

② It is applied to spray condensing secondary steam. In some processes, a large amount of secondary steam will be produced and a small amount of non condensable gas needs to be discharged to maintain normal production. This kind of water jet pump is also called water jet condenser, which takes condensation as the main and exhaust as the auxiliary.

③ It is applied to vapor-liquid mass transfer and absorption. The liquid flowing out at high speed meets the ejected gas. The entrainment process of air flow by jet is also the process of vapor-liquid two-phase mixing. Due to the large contact surface between gas and liquid in water jet pump, high-speed jet has great speed, which greatly strengthens the speed of mass exchange in absorption and mass transfer, and accelerates chemical reaction or material transfer process. Therefore, water jet pump has the function of both reactor and pump. It is used as absorption and mass transfer equipment in many occasions

④ In many large chemical plants and chemical fertilizer plants, the steam or hot water with certain energy is often discharged, resulting in energy waste. Water jet pump is used to inject low-energy fluid with less jars of high-energy fluid, so as to increase the energy site of the fluid, and then used in the production process.

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Vacuum pump in oil refining and petrochemical production

Vacuum pump is a kind of conveying machinery that draws air from negative pressure and exhausts at atmospheric pressure. Its purpose is to create and maintain the vacuum required by the process system. The vacuum pumps commonly used in oil refining and petrochemical production include reciprocating vacuum pump, water ring vacuum pump and jet vacuum pump.

The structure and working principle of reciprocating vacuum pump are basically the same as that of reciprocating compressor. The pressure difference between inside and outside the cylinder is very small, but its compression ratio is very large (for example, for 95% vacuum degree, the compression ratio is about 20). Therefore, the suction and discharge valves of the reciprocating vacuum pump must be light and flexible, easy to open and close; the volume of the rest gaps must be very small. At the same time, in order to reduce the adverse effect of the residual gas in the clearance on the pumping rate of the vacuum pump, the inner wall of the two ends of the cylinder of the vacuum pump is often provided with a balance airway connecting the two sides of the piston.

At the end of exhaust, the balance port can make the clearance communicate with the other side of the piston for a short time, so that the residual gas in the clearance can flow to the other side of the piston through the balance airway, so as to reduce the pressure of the gas in the clearance, so as to improve the suction efficiency, that is, to increase the volume coefficient. The limit vacuum produced by reciprocating vacuum pump can reach about 2KPa (absolute pressure). The gas discharged by reciprocating vacuum pump should not contain liquid. If the gas contains a large amount of steam, the condensable gas must be removed (generally condensed) before entering the vacuum pump, that is, reciprocating vacuum pump belongs to dry vacuum pump.

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Composition and parameters of vacuum suction system

Use the vacuum pump or fan as the power source to make the inside of the system vacuum. The material moves in the pipeline in the suspended state. The working gas and the material are separated by the separator. This is vacuum suction.

Compared with other material conveying methods, vacuum suction has the advantage of simple equipment. It occupies less area, reliable suction conveying, and simple operation. It can be conveyed from several places to one place. It can also be distributed from one place to several places. It can be continuous discharge and intermittent discharge; the whole system is in operation. Negative pressure. No dust. Good working conditions. In contrast, its shortcomings are high energy consumption and more serious wear at the elbow. Some equipment abroad solves this problem by lining the inner wall of the elbow with soft rubber.

Vacuum suction can be divided into high vacuum suction and low vacuum suction according to different vacuum levels and vacuum pumps. High vacuum suction generally uses jet pumps and water ring pumps as the power source. The vacuum of the system is high, generally 5×104~3×104Pa. The airflow is also the smallest. At present, the largest SZ-4 water ring vacuum pump in China has a theoretical air flow of only 660m³/h when the degree of vacuum is 60%. Low vacuum suction generally uses centrifugal fans and ventilators as the power source. The straightness of the system is low. Generally it is 9×104~8×104Pa, so the conveying distance is close. It is not more than 50m, but the air volume is large. Such as the frequently used 7-17-9 1/2 fan. The air volume can reach 1800m3/h.

Vacuum suction has been widely used at home and abroad. From the loading and unloading of large ships to metallurgy. The transportation of bulk materials in foundry factories and flour mills, breweries, dust collection, dust removal, ash treatment, etc. In short, as long as there are bulk materials transportation and transportation, this method can be used. . The data reported that the vacuum suction device has been produced in specialized manufacturers abroad, and the stereotyped components of the entire system have been standardized and serialized.

The vacuum suction system mainly includes silo, suction nozzle, seat separator, separation silo, dust collector, water ring pump and other components.

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Multiple water ring vacuum pumps

The advantages of using multiple water ring vacuum pumps at the same time, take a look!

  If the customer chooses three water ring vacuum pumps, one is used, one is standby, and one is overhauled, respectively connected in parallel with the three main drainage pumps and controlled by gate valves. So what are the advantages of using multiple water ring vacuum pumps?
   1. The water ring vacuum pump has a simple structure, low processing and manufacturing requirements, no suction and exhaust valves, stable operation, and even air volume;

  2. The compression of the water ring vacuum pump is close to isothermal compression, the temperature change during compression is small, and there is no metal contact surface in the pump that rubs against each other, which is not easy to cause combustion and explosion accidents;

  3. The rotating parts and the fixed parts in the pump cavity are sealed by liquid, no need for lubrication, simple maintenance, easy operation, stable and reliable work;

4. From the use result, after using the water ring vacuum pump, the drainage efficiency of the main drainage pump is significantly improved, and the starting procedure is simplified, the labor intensity when starting the pump is reduced, and the pump body has no impact and little damage when the pump is started. ;

  5. After using the water ring vacuum pump, the inlet bottom valve of the suction pipe is eliminated, the suction water is unobstructed, and the drainage efficiency of the pump is improved;

  6. Since the direction of water injection in the water injection pipe is from bottom to top, when the water level rises to the pump body, it can ensure that there is no air in the suction pipe and the pump body, preventing the occurrence of cavitation, which is conducive to the daily maintenance of the main drainage pump.

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Rotary Vane Vacuum Pump

Vacuum Valves Classification

Precautions for shutdown of stainless steel vacuum pump

Today, Xiaobian introduced to you what should be paid attention to when the stainless steel vacuum pump is shut down. Let's get to know.

1. First, close the intake pipe valve and working fluid valve;

2. Stop the motor;

3. Close the valve in the mechanical seal flushing pipeline;

4. If the ambient temperature is lower than 0 ℃, discharge the liquid in the pump body, separator and all pipelines after shutdown;

5. If the stainless steel vacuum pump is filled with working fluid, it will cause difficulty in starting the stainless steel vacuum pump. Therefore, after the pump is stopped, it must be ensured that the liquid cannot enter the pump body and intake pipe from the exhaust pipe, working liquid supply pipe, etc. If the exhaust side is equipped with a gas water separator, more attention should be paid. If it is uncertain whether the pump is filled with working fluid in other installation conditions or in case of failure, drain the working fluid in the pump before starting or ensure that the working fluid accounts for about 1 / 2-2 / 3 of the pump cavity.


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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

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Stainless steel magnetic pump

The magnetic pump is made of stainless steel with reasonable design and advanced technology. It has the characteristics of full sealing, no leakage and corrosion resistance. Static seal is used instead of dynamic seal in stainless steel magnetic pump, which makes the overflow parts of the pump in a completely sealed state.

The magnetic pump is made of corrosion-resistant and high-strength engineering plastics, jadeite ceramics and stainless steel. Therefore, it has good corrosion resistance and can prevent the transported medium from pollution.

The main materials and uses of magnetic pump the magnetic pump has compact structure, beautiful appearance, small volume, low noise, reliable operation, convenient use and maintenance. It can be widely used in chemical, pharmaceutical, petroleum, electroplating, food, national defense, scientific research institutions, metallurgy, dye and other units to pump acid, alkali, oil rare and precious liquid, venom, volatile liquid, as well as circulating water equipment supporting, filter supporting.

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How to select horizontal centrifugal pump

Centrifugal pump is designed according to the principle of centrifugal force. The high-speed rotating impeller blades drive the water to rotate and throw out the water, so as to achieve the purpose of transportation. There are many kinds of centrifugal pumps, which can be divided into civil and industrial pumps from the use; from the transmission medium, they can be divided into clean water pump, impurity pump, corrosion-resistant pump, etc.

1、 The horizontal centrifugal pump with high efficiency, low noise and energy saving shall be selected, and it is strictly prohibited to choose out products.

2、 The motor voltage of horizontal centrifugal pump shall be the same, and the power supply system shall be the same as that of national grid.

3、 The pump shall be selected according to the design flow and the required head, and the pump output shall be reduced due to the abrasion of the pump. The pump can be selected by multiplying the calculated head h by the coefficient of 1.05-1.10. The characteristic curve shall be the pump whose head gradually decreases with the increase of the flow, so that the pump can work stably and reliably in parallel. The operation point of the pump shall be kept in the high-efficiency section for operation OK, it's energy-saving and not easy to damage the parts.

4、 When there is no regulating facility in the water supply network, it is better to use speed regulating pump group or rated speed pump group to run water supply. The maximum water output of the pump unit shall not be less than the design flow of water supply in the community, and shall be checked according to the fire fighting condition.

5、 The number of lifting pumps for water tank and water tower shall be minimized, one for use and one for standby; when a single pump can meet the requirements, multiple parallel connection mode shall not be adopted; if multiple parallel operation or matching mode of large and small pumps must be adopted, its model and number shall not be too many, and the model shall not be more than two generally, and the lift range of horizontal centrifugal pump shall be similar; each pump shall be in parallel operation The pump should still operate in the high efficiency area.

6、 The design water supply flow of the variable frequency speed regulating pump shall meet the requirements of the maximum design second flow in the domestic water supply system. The power supply shall be reliable; the working point of the water pump shall be selected in the efficient working area of the water pump characteristic curve, and shall not be selected on the extension line of the Q-H curve; the most unfavorable working point shall be designed at the right end of the efficient section of the water pump characteristic curve, that is, the point where the water output of the water pump is the largest and the lift is low, but it can meet the requirements, that is, the low point of the efficient section of the water pump characteristic curve and the pipeline characteristic curve The intersection of. The working range of water pump speed regulation shall be within the high efficiency section of water pump as far as possible; the speed regulation range shall be between 25% and 100% of water supply of water pump; the equipment shall have the function of automatic water level control.

7、 The water pump unit of the domestic pressurized water supply system shall be equipped with standby pump. The water supply capacity of the standby pump shall be greater than that of the largest operating water pump. The water pump shall be switched automatically and operated alternately

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Resistance And Ionization Compound Vacuum Gauge ZDF-III-LED

Import vacuum pump in aquaculture

With the improvement of economic level and the progress of science and technology, aquaculture has become one of the important economic industries in China. The scale of aquaculture is conducive to reducing the import of China's aquatic products, increasing the export volume and improving the production enterprises of China's aquatic products. These benefits also promote the development of regional economy, realize the sustainable development of economy and solve the employment problem. At present, there are still some problems in aquaculture in China. In order to transport live fish without damage to the fish body, the application scheme of imported vacuum pump in aquaculture has been formulated.

With the rapid development of aquaculture in China, various advanced water treatment technologies have been widely used, including the application of imported vacuum pump in aquaculture.

The layout of the pump body of the imported vacuum pump determines the overall structure of the pump. The vertical structure of inlet and outlet is horizontal, which is convenient for assembling and connecting pipes. However, the pump has a high center of gravity and poor stability at high speed, so this type is mainly used for small pumps.

The inlet of the horizontal pump is at the top and the outlet is at the bottom. Sometimes it is convenient to install and connect the pipes of the vacuum system, and the exhaust port can be taken out from the horizontal direction, that is, the directions of the air inlet and the exhaust are perpendicular to each other. At this time, the exhaust port can be opened from the left or right direction, except one end of the exhaust pipe, and the other end is blocked or connected to the bypass valve. The pump has low center of gravity and good stability at high speed. Usually, large and medium pumps use this type of construction.

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Piston Vacuum Pump

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Rotary vane vacuum pump in sealed vessel

The purpose of this paper is to provide a vacuum device for vacuum vessel and develop the application of rotary vane vacuum pump in sealed vessel. Why vacuum in sealed containers? Sealed containers are widely used in all aspects of life. They are usually used under the storage conditions of this type of highly sealed beverage, spices, seasonings, etc. storage in sealed containers is minimized, which is triggered by deterioration in contact with the external environment. The existing containers not only meet the requirements of containing liquid or solid, but also need to have sealing function, which is convenient for transportation, carrying and storage to meet the requirements. The use purpose is to overcome the disadvantages of the prior art, and to provide a container with good sealing effect and easy to open and close with a rotary vane vacuum pump.

In today's sealed beverage containers, in addition to the cork of red wine wine, the regular screw cap, serrated cap, cork plug and cork silica gel are usually used for drinks. The sealing mud is also applied at the joint between the cork and the bottle mouth to further ensure the sealing.

However, in the actual use process, sealing materials such as sealing mud are directly in contact with the external environment. If the sealing material is accidentally spilled or water, or in humid air, the sealing material may be damaged, deformed, and dissolved, which not only loses the sealing function, but also pollutes the bottle mouth, which is not easy to thoroughly clean. When the user starts to open the bottle plug, it is also in a tight way Sealed containers are likely to contaminate drinks.

The rotary vane vacuum pump can extract the dry gas in the sealed container. If it is attached to the gas ballast device, it can inhale the condensable gas. But it is not suitable for high oxygen extraction, corrosion of metals, chemical reaction of pump oil and dust-containing particulate gas.

Rotary vane vacuum pump is one of the most basic vacuum technology in vacuum equipment. The rotary vane vacuum pump is a multistage pump. Rotary vane vacuum pump and single-stage and two-stage. The so-called two-stage, that is, the structure will connect the two single-stage pumps. Double stage, high vacuum can be obtained.

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Dry Type Oilless Vacuum Pumps

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Advantages of dry vacuum pump

The most obvious is that the dry vacuum pump does not have water as the medium. Compared with the traditional vacuum device, it can effectively save water resources and reduce energy consumption. Compared with other enterprises, it can truly make the production more environmentally friendly and improve the capacity of production capacity development. At the same time, in the growing strength advantage, the performance of dry vacuum pump has been fully reflected its own advantages, increasing the importance of product application and development capacity for the production needs of enterprises, and constantly increasing the strength and capacity of driving technology to improve the effective production capacity.

With the overall level of the dry vacuum pump, speeding up production and improving its application ability reflect the strength of all aspects. According to the domestic industry situation, increasing investment in product development, and actively learning advanced technology in all aspects to enhance the ability of self-development, which reflects the performance of the dry pump. Dry vacuum pump is the future development trend of the industry. Although it is not very useful, apart from the reasons, high house price, and the user's understanding of dry vacuum pump is not in place, and they do not see the future economic benefits of the enterprise. The focus is on how to optimize the selection of dry vacuum pump?

For different types of dry vacuum pump, we hope to reduce its physical size. However, this is against the pumping speed of vacuum pump, because the volume is directly proportional to the pumping speed of vacuum pump and vacuum pump, small physical size means small volume. Of course, there is also an important factor that affects the pumping speed of vacuum pump, that is speed. In order to match the small size and the large size of the vacuum pumping speed, it is necessary to increase its speed. There are two ways to change the rotating speed of the vacuum pump, one is to change the frequency of the power supply, that is, the frequency of use; the second is to change the transmission ratio of the gearbox. Among them, the advantage of using inverter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Gearbox ratio is a very economical way, of course, it can only provide a single speed that cannot be controlled.

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corrosion resistant vacuum pump advantages

Vacuum pump is a rotary positive displacement gas delivery pump, which includes dry screw vacuum pump, water ring pump, reciprocating pump, rotary piston pump, rotary vane pump, roots pump and diffusion pump, etc. it has more characteristics of large pumping speed in a wide pressure range, and is widely used in metallurgy, chemical industry, food, electronics, coating and other industries. Using vacuum pump in different environment will inevitably have a problem of anti-corrosion of vacuum pump, but how to solve the problem of corrosion of vacuum pump is usually used in the ceramic anti-corrosion polymer pre protection of polymer. Corrosion resistant vacuum pump is the contact part of all gases. It is made of polytetrafluoroethylene (PTFE). It is suitable for corrosive process gases in chemical, pharmaceutical and petrochemical industries, such as filtration, vacuum distillation, rotary evaporation, vacuum concentration, centrifugal concentration, and solid-phase extraction.

Working principle: when the corrosion-resistant pump impeller rotates unfavourably in an economic way, the water is thrown around by the impeller, under the action of centrifugal force, a closed ring shape, and the formation of water determined by the thickness of the pump chamber is approximately equal. The lower part of the inner surface of the water ring has the impeller and tangential in the box, just touching the surface (in fact, the insertion depth of the blade into the water ring) and the water ring at the tip of the upper blade. At this time, a crescent shaped space is formed between the water ring and the impeller shell in the interface, and this space has formed several chambers of corrosion-resistant vacuum pump impeller blades and an equal number of blades.

If the corrosion resistance of the lower impeller 0 starts the vacuum pump, before the volume of the impeller cavity, the rotation is changed from small to large at 180, and it is connected with the air inlet and the end face of the gas is now inhaled. When the induction chamber is isolated at the end of the air inlet when the impeller continues to rotate, the gas is compressed in the small chamber from large to small. When the chamber is connected with the exhaust port, the gas becomes the external discharge of the corrosion resistant pump Out.

The corrosion-resistant vacuum pump is a variable displacement pump, which can change the volume of the pump chamber to achieve intake, compression and exhaust.

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Dry Type Oilless Vacuum Pumps

Oil Diffusion Vacuum Pump