rotary vane vacuum pump installation method

Rotary vane vacuum pump should be placed horizontally. With the pump operation almost no oscillation, generally can not be fixed. There are metric screw holes on the damping pad at the bottom of the rotary vane vacuum pump to fix the pump. Do not push or pull the pump on the ground to avoid damaging the damping pad. In order to ensure excellent cooling of the rotary vane vacuum pump, the cooling air inlet and outlet of the pump should be more than 30cm away from the surrounding objects. 

In order to facilitate repair, it is proposed to leave 0.4m space in front of the air inlet and exhaust port of rotary vane vacuum pump. In order to facilitate the oil drain, the base with oil drain pan can be installed, and the pump delivered by rotary vane vacuum pump does not carry oil. After the installation, slowly inject the regular vacuum pump oil through the oil filling port to 3 / 4 of the oil window height.

The electrical connection of rotary vane vacuum pump and the electrical wiring of rotary vane vacuum pump should be carried out by professional electricians. It is necessary to check the rotation direction of the motor after the wiring of the three-phase asynchronous motor of the rotary vane vacuum pump is completed. The correct rotation direction of the motor is: from the fan end of the motor tail, the rotation direction of the motor shaft is counterclockwise.

When checking the rotation direction of rotary vane vacuum pump, the suction port should be turned over or covered with rubber plate (thickness over 4mm), and the power supply should be connected for 2 ~ 3 seconds. If the rotation direction is correct, you will feel strong suction or rubber plate tightly at the suction port. If it is reversed, adjust two of the three power lines arbitrarily.

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Power supply mode of water ring vacuum pump

Water ring vacuum pump needs power supply in use and can be used in power supply equipment normally, but the power supply method is different. The efficiency varies with the mode of power supply. Here we introduce the power supply mode. 

1. The water ring vacuum pump has a large specific gravity because the extraction medium is "water or liquid". The working medium of micro vacuum pump and micro air pump is "gas" with light specific gravity. Therefore, the working current of the vacuum pump is generally larger than that of the latter, about 1 ~ 10 amperes, but the working current of the latter is generally not from a few hundred milliamperes to a few amperes.

2. Battery is the general term of battery. The principle is different from the dry battery, because it can provide large current and power, so it is widely used in electric vehicles, cars and other mobile vehicles, agricultural spraying, field sampling and other power shortage.

3. The common dry battery (such as 1.5V No.1 battery) has large internal resistance and small current supplied by itself. Most of the voltage is consumed by internal resistance, so the voltage drop is fast. From the point of view of power and service time, it is suitable for the power supply of water supply ring vacuum pump.

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Volume and application of liquid ring vacuum pump cavity

In the process of using liquid ring vacuum pump, it is a self-priming pump, and its products are gradually adopted by mining, chemical industry, light industry, petroleum and other industries. In the process of industrial production, there are many technological processes, such as vacuum water diversion, vacuum evaporation, vacuum moisture regain and so on. 

Liquid ring vacuum pump can be widely used, mainly because of the rapid development of its application technology. In the process of using the equipment, the gas compression in the water ring pump is isothermal, so it can pump out its explosive and flammable gas, and it can also pump out the gas containing water and dust in the process of using.

When the pump is equipped with a proper amount of impeller, it can be thrown into the water directly in the process of working.

The lower part of the water ring of the liquid ring vacuum pump is just tangent to the impeller, and the inner surface of the upper part of the water ring is just in contact with the top of the blade. At this time, a crescent shaped space will be directly formed between the water ring and the impeller, which is also equivalent to several small cavities.

In the process of using liquid ring vacuum pump, it mainly depends on the change of pump cavity volume to effectively realize the function of exhaust and suction. The structure of the equipment is relatively simple, and its accuracy requirement is not high in the process of production, so it is very easy to process.

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How to use screw vacuum pump

Screw vacuum pump will be affected by air leakage in the process of use. Many users think that this is a quality problem of the equipment, which has been replaced by new equipment. However, the cause of air leakage is not only the quality problem, but also the front and rear covers are different? In other words, the front and rear covers of the screw vacuum pump have different axial degrees, and the result is the same as the bearing deflection. 

With the increase of the liquid ring temperature, the saturated vapor pressure also increases, which reduces the vacuum degree of the screw vacuum pump, but has no effect on the exhaust pressure? Tighten the connecting bolts and stuffing box of the screw vacuum pump, tighten the connection between the pipeline, instrument and other parts, or replace the gasket and stuffing.

For the leakage of the screw vacuum pump, putty can also be used as a temporary remedy to make the bearing deflect, so that the impeller inclines and is installed in the pump body of the screw vacuum pump. The axial clearance of single acting pump is uneven. When the impeller rotates, the side cover must have certain friction, and the side cover and the impeller end face will be scratched.

When the gas in the compression chamber passes through the increased gap, the axial gap increases, and a large amount of gas leaks into the suction chamber, thus reducing the vacuum pressure or discharge pressure of the screw vacuum pump. At this time, the bearing of screw vacuum pump must be removed for maintenance, and then installed correctly. Screw vacuum pump is a kind of pump device, which completes the suction and exhaust work produced by synchronous high-speed reverse rotation in the pump shell.

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Reciprocating vacuum pump

The working principle of reciprocating vacuum pump is similar to that of reciprocating pump. During operation, through the action of crankshaft and connecting rod, the piston in the cylinder moves back and forth to achieve the purpose of suction and exhaust. Domestic reciprocating vacuum pump has V-type series. It is composed of body, cylinder, piston, crosshead, crankshaft, connecting rod and valve. When the piston moves back and forth, one end of the piston sucks gas from the vacuum system, while the other end exhausts the gas that has been sucked into the cylinder. 

Reciprocating vacuum pump can be directly used to obtain rough vacuum, and its limit pressure is generally about 10 mmHg (1333 PA). The advantage of using this kind of pump is that it has a larger pumping speed under the condition that the vacuum degree is not high in general food vacuum concentration and vacuum drying.

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The reason of vacuum failure of water ring vacuum pump

As one of the common equipment of dehydration parts in paper mill, water ring vacuum pump can be used for suction water tank and vacuum roller to draw water in the paper. The working principle is: before starting the water ring pump, water ring is formed at the rim by rotating the cylindrical impeller after the start-up. Because the cavity shell of the pump body is oval, the water ring rotating with the impeller wheel will be pushed in and out in the impeller chamber, resulting in vacuum and pressure transmission. 

After two or three years of use, the vacuum suction capacity of water ring vacuum pump will be decreased. There are also some problems in the vacuum suction capacity of many 2BV water ring vacuum pumps used in a paper mill. Later, the whole vacuum pump was disassembled and inspected, and the reason for its failure was finally found.

1. many cavitation pits of different sizes and shapes are formed on the blades of impeller, which are more serious in the rim part, and the largest cavitation pit can reach 60 × 15 × 30mm3.

2. the tolerance of the matching between the elliptical cavity shell and impeller of the pump body becomes larger.

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Reciprocating vacuum pump

 Reciprocating vacuum pump is a double acting vacuum pump made in the former Soviet Union. It is composed of piston, air valve, cylinder, crosshead, connecting rod, crank and other parts. The bearing bush and cylinder of vacuum pump are supplied by special lubrication system. The lubricating oil brands are large and the consumption is large. Due to the high heat generated by gas compression, the room temperature is still as high as 40 ℃ in summer, even though it is equipped with cylinder cooling system, which is unfavorable to the equipment and the body. Moreover, the maintenance of the equipment is inconvenient, the failures are frequent, the maintenance period of cylinder cleaning and pad grinding is long, and the consumption of spare parts is large. 

2be water ring vacuum pump is a single-stage and single action vacuum pump produced by referring to foreign advanced technology. It is an energy-saving product. 2be water ring vacuum pump adopts axial suction and exhaust structure, mainly composed of pump body, impeller, main shaft, drive side distributor, non drive side distributor side cover, automatic drain valve and other parts. The impeller is eccentrically installed in the pump body. When the impeller rotates, the pump body is affected by centrifugal force and forms a rotating liquid ring on the inner wall of the pump. The gap between the impeller end face and the adapter is sealed by liquid. During the rotation process of the impeller at the first half rotation (passing through the suction hole), the volume of the sealed cavity gradually expands, and the gas is inhaled from the suction hole, and then rotates in the latter half rotation (passing through the exhaust hole) In the process, the sealing volume gradually reduces, and the gas is discharged from the exhaust hole to complete a gas extraction process.

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Eccentric machining method for eccentric parts of rotary vane vacuum pump

Rotary vane vacuum pump and slide valve vacuum pump belong to oil seal mechanical vacuum pump. In structure, there is an off center position relative to the pump cavity. This position is the central position for installing the rotating parts. Its relative size often affects the assembly and vacuum performance of vacuum pump. Either the rotating parts cannot be installed or the inner wall of the pump chamber cannot be contacted well after being installed No sealing and poor vacuum performance. 

Therefore, whether in production or repair, we should pay attention to the eccentric processing problem, and strictly control the eccentric size. For 2x series rotary vane vacuum pump, the eccentricity is on the middle diaphragm, and the bearing supporting the rotor is installed on the eccentricity. The position of the bearing affects the assembly clearance of the rotor. Therefore, if it is not done well, the vacuum degree is often unstable, or the outer circle dimension tolerance of the rotor must be modified to make up for it. This is good for maintaining a small number of pumps, but not for mass production.

If you want the dimensional accuracy to be stable, it depends on the tooling. Among the various errors in the processing process, the selection of positioning reference is the most important.

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Development of Roots vacuum pump unit

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

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

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

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Working principle of circulating water cooling device for vacuum pump unit

What is the working principle of circulating water cooling device of vacuum pump unit? Let's have a brief understanding. Pump the water in the storage tank into the water sprayer, and pump the water to the cooling water inlet of the unit 

Under the action of exhaust fan, the water evaporates on the surface, dissipates heat and cools down, and then returns to the water storage tank. The distribution of the holes on the porous plate determines the position of the water column, so that the small holes on the porous plate are evenly distributed, so that the air flow can fully contact the water column and form the surface of swallow hair as large as possible Achieve the purpose of water cooling

Considering that the water discharged from the vacuum unit is far away from the air and the temperature difference between it and the air is relatively large, the first stage of forced cooling with air cooling is designed. The water discharged from the vacuum unit passes through the radiator first, and the radiator is placed behind the fan, and then the cool air passing through the water is blown to the radiator, so that the hot water discharged from the diffusion pump is cooled, and then returned to the water storage tank. The cooling water flow in the diffusion pump can be controlled It was observed directly in the device.

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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.

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Troubleshooting of rotary vane vacuum pump

If the rotary vane vacuum pump is not operated properly, it will often present some defects, such as vacuum drop, oil injection, smoke, oil leakage at oil seal, noise, and emulsification of vacuum pump oil in the pump. In case of such a situation, first of all, there is no need to panic. After the shutdown, clean up one by one according to the shortcomings. Here are some ways to eliminate shortcomings. 

Rotary vane vacuum pump smoke and fuel injection: refers to rotary vane vacuum pump in operation, exhaust port smoke or fuel injection. The assumption is that the pump has just started to run, there is smoke phenomenon, belongs to normal, if the long time in smoke is abnormal. The way to deal with it: smoke indicates that the air inlet of the pump, including pipes, valves and containers, has been repaired. After leak detection, the smoke will end.

Vortex flowmeter fuel injection, indicating that there are a lot of leakage points outside the intake port, so that the air inlet is exposed to the atmosphere. Treatment: seal the air inlet of the pump to make the pump run. If there is no oil injection, it indicates that there is leakage; if the exhaust valve plate is damaged, check whether the exhaust valve plate can be damaged and replace the damaged exhaust valve plate. Rotary vane vacuum pump noise: here refers to the noise of the pump.

Knock the cylinder, pump operation when issued irregular sound, like metal knock metal sound. This is the sound of the rotating plate hitting the pump body. This situation is mainly caused by the spring break or contraction or pop-up failure between the pairs of rotating blades. Solution: turn on the pump to check whether the spring can be damaged. Replace the spring. Exhaust valve noise, mainly due to pump exhaust valve plate damage. Disposal way: change the good exhaust valve piece.

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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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2BV water ring vacuum industry pump development

 In view of the continuous development of 2BV water ring vacuum pump, according to the use characteristics of products and other aspects, many manufacturers combine with the actual situation of the company, take the development of high cost performance of products as the advantage, actively develop and produce the products, improve the performance of the overall strength of the products, improve the practical application ability of the products with perfect production attitude, and constantly promote its development The driving force of the exhibition is to develop the form of practical application of products and promote the rationalization of the company's production, so as to reflect the goal of enterprise development. 

In order to develop 2BV water ring vacuum pump, it is necessary to develop the application effect in all aspects according to the practical performance of the product, promote the overall development of the product according to the design requirements of the unit, expand its continuous development advantages with a higher product form, and enhance the in-depth application ability in all aspects. Only by strict production management mode can the product quality be guaranteed Large power for the development of enterprises, so as to expand the advantages of unit application capacity.

In the whole vacuum industry, the position of 2BV water ring vacuum pump is also gradually improved. From the superiority of its practicability, it can hold the ability of products. In the process of effectively improving the ability of product application and development, it is necessary to further promote the development of its performance and expand the application value of the product.

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water ring vacuum pump quality

With the continuous expansion of the market demand capacity of water ring vacuum pump, in the actual process of using advanced equipment and processing technology to improve its application effect, the overall development of its advantage level can be realized by using the driving force of the overall advantages of the product. Under the overall improvement advantage of the product processing effect, the overall development of its application performance such as quality should be combined, Using the overall driving force of all aspects of the product, the reasonable promotion of the product application value ability is realized, and the technical advantages of the equipment are reflected. 

Focusing on the performance and quality of the water ring vacuum pump, the company has continuously strengthened its efforts in technical improvement and product optimization, focusing on science and technology, enhancing the overall advantages of the equipment, providing a solid foundation for continuously enhancing the practical advantages of the products and accelerating the overall development of its quality strength. At the same time, it has also accelerated the improvement of production efficiency and improved the production tasks in terms of quality and quantity Under the premise of increasing the pursuit of product quality advantage, reflecting the overall level of productivity.

Make the water ring vacuum pump in all aspects of application ability, highlight the application value of its products, promote the dominant position of equipment in various industries, continuously enhance the overall application strength of the enterprise with efficient product performance, and provide strong basic advantages for the development of water ring pump.


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reciprocating vacuum pump principle application

 

Reciprocating vacuum pump is the use of piston back and forth movement, the energy is transmitted to the liquid. To end the mission of liquid delivery. The flow rate of reciprocating pump is only related to the displacement of piston and the condition of pipeline, but the lift of reciprocating pump is only related to the condition of pipeline.

The reciprocating pump used in practical production has different structural methods because of different liquid properties or different application targets. When used to transport flammable and explosive liquids, the reciprocating pump driven by steam is often used for safety.

In order to prevent piston from being damaged, a barrier pump is used to separate the piston from the main body by using an elastic film. This elastic film is made of rubbers or special metals with good abrasion resistance and corrosion resistance. All parts on the right side of the barrier are made of or lined with anti-corrosion materials; the left side of the barrier is filled with water or oil. When the piston moves back and forth, the gap is forced to turn to both sides alternately, resulting in the corrosive liquid or suspension being sucked and pressed out in turn on the right side of the barrier. Not with the piston. This kind of pump requires huge skill. It is easy to damage and difficult to repair.

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Water ring vacuum pump in chemical fertilizer operation

Chemical fertilizer industry has a decisive effect on China's agricultural development, especially the production of phosphate fertilizer is an industry supported by the key points in the micro regulation and control of national economy in China. Therefore, large and super large water ring vacuum pumps have also been used here. For example, a phosphate fertilizer enterprise in Yunnan Province added three extra large water ring pumps with pumping capacity of 300m3 / min after one transformation. 

In addition, there are many phosphate fertilizer enterprises that still need to have greater ability to pump air when the absolute pressure is 80 ~ 100hPa. However, the vacuum degree of a single water ring vacuum pump is 3300 PA, which can not meet the process requirements. However, if an atmospheric injector is added in front of the water ring pump, the vacuum degree will get certain progress and have common advantages.

It was found in the telephone consultation of many chemical fertilizer enterprises that the reciprocating vacuum pump they used before was gradually screened out because of the large number of vulnerable parts and high noise. The double-stage water ring vacuum pump was replaced by the double-stage water ring vacuum pump, which has achieved good results. According to the practical experience, the double-stage water ring vacuum pump will be used more and more widely in this profession.


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General structure of vacuum pump

Vertical structure of the intake and exhaust port horizontal settings, assembly and connection of the pipeline are more convenient. However, the center of gravity of the pump is high, and the stability is poor at high speed operation, so this type of pump is mostly used for small pumps. 

The air inlet of horizontal pump is in the upper part and the exhaust port is in the lower part. Sometimes, in order to facilitate the installation and connection of vacuum system pipeline, the exhaust port can be connected from the horizontal direction, that is, the inlet and outlet directions are perpendicular to each other. At this time, the exhaust port can be opened from the left or right directions. In addition to one end of the exhaust pipe, the other end is blocked or connected with a bypass valve. This kind of pump has low center of gravity and good stability at high speed. General large and medium-sized pumps use this structure. 

The two rotor shafts of the vacuum pump are installed vertically with the horizontal plane. This structure is easy to control the assembly clearance, the rotor assembly is convenient, and the pump occupies a small area. However, the center of gravity of the pump is high and the gear assembly and disassembly is inconvenient, and the lubrication mechanism is relatively complex.

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Roots Vacuum Pump 

The limit pressure of vacuum pump

Shortly after the vacuum pump started to work, the minimum pressure P'g appeared. The vacuum pump continues to operate. Because of the increase of vacuum pump temperature, the saturated vapor pressure and viscosity of vacuum pump oil rise and viscosity drop, and the inlet pressure slightly rises to PG. PG is the stable minimum pressure obtained by the vacuum pump, and also the limit pressure of the vacuum pump. 

The limit pressure of the rotary vane vacuum pump is related to the type of vacuum gauge used in measurement. When the compression vacuum meter is used, the limit pressure value is about one order of magnitude lower than that measured by the heat conduction vacuum meter (thermocouple or piezometer, etc.). This is because the former can only measure the partial pressure of permanent gas, the latter is the total pressure of the compressed gas. The current regulations of our country use compression vacuum gauge to measure the limit pressure of oil seal mechanical vacuum pump.

The circulating oil quantity of vacuum pump also affects the limit pressure of vacuum pump. With the increase of oil quantity, the better sealing effect is, the relationship between the limit pressure and oil quantity of vacuum pump changes, and the saturation vapor pressure Po of oil is achieved. In fact, there is a lot of air and water in the vacuum pump oil. After the vacuum pump oil enters the vacuum pump cavity, the air and water absorbed in the vacuum pump oil are released. The relationship between the limit pressure and the oil quantity of the vacuum pump develops upward.

Generally, the vacuum pump oil should be kept on the specified oil level, so that the circulating oil quantity of the vacuum pump should be kept to a certain extent. For double stage vacuum pump, vacuum pump oil can enter high vacuum stage only after degassing at low vacuum stage, so that the amount of air discharge of vacuum pump oil in high vacuum stage can be reduced, so as to reduce the limit pressure of vacuum pump.

The limit pressure of vacuum pump is related to the working temperature of vacuum pump oil. The higher the oil temperature, the higher the saturated vapor pressure of the oil, the higher the limit pressure of the vacuum pump.

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Working process of vacuum pump unit

In the process of using vacuum pump unit, its main function is to improve the vacuum degree of the vacuum system and the pumping speed under high vacuum environment. Since there is no gas compression in the working process of roots pump, when roots pump is directly discharged into the atmosphere, the pressure difference between the suction port and the exhaust port will be too large, which will overload the vacuum pump. If the power of the vacuum pump motor is simply increased, the vacuum will be caused The pump overheats so that the small gap between the vacuum pump rotors is quickly blocked due to thermal expansion. 

In order to ensure that the vacuum pump unit can reach a higher vacuum, the clearance between the vacuum pump rotors must be ensured. Therefore, the vacuum pump must be equipped with a front-end pump. When the pressure in the system is pumped to a certain range by the front-stage pump, the vacuum pump can be started again, so as to avoid overload of the vacuum pump. The front stage pump can choose screw vacuum pump, rotary vane vacuum pump, scroll vacuum pump and other vacuum pumps which can discharge air directly.

In general, the vacuum degree of a single screw vacuum pump can be better than that of 2-3 water ring or reciprocating vacuum unit. If it is necessary to maintain high pumping speed in high vacuum environment, it is recommended to use with vacuum pump. Our vacuum pump adopts hydraulic coupling design, which can start the unit at the same time under normal pressure. Due to the early intervention of the pump, the overall pumping speed of our unit is increased by more than 30% compared with the traditional unit!

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