water ring vacuum pump of advantages

Advantages of water ring vacuum pumps than other types of vacuum pumps

The water ring vacuum pump is deeply loved by the majority of users because the water ring vacuum pump has the following advantages compared with other types of vacuum pumps:

The structure is simple, the manufacturing accuracy is not high, and it is easy to process.

The structure is compact, the pump's revolutions are relatively high, and can be directly connected with the motor, without slowing down devices. Therefore, with a small structural size, large displacement can be achieved and the floor area is also small.

The compressed gas is basically isothermal, that is, the temperature change of compressed gas is very small.

Because there is no metal friction surface in the pump cavity, there is no need to lubricate the pump, and the wear is very small. The seals between the rotating parts and the fixings can be directly sealed by water seals.Diffusion-vacuum-pump-features

Uniform suction, stable and reliable operation, simple operation, easy maintenance.

How to select vacuum pump for vacuum pump unit?

The method and key of vacuum pump unit selection for vacuum pump unit are introduced. The proper selection of vacuum pump unit will save a lot of expenditure in terms of cost. A good grasp of the method of vacuum pump unit allocation will also bring a lot of benefits to operation and maintenance costs. Here is an introduction of vacuum pump unit selection Vacuum pump method:dry-screw-vacuum-pumps-several-common-rotors

1. The basis of selecting pumps for vacuum pumps.

(l) According to the vacuum unit no-load vacuum chamber needs to meet the limit of vacuum degree and the actual production and operation of the vacuum degree to be achieved, the specific use of which vacuum pump can meet the requirements. The optimum operating range of several commonly used vacuum pumps is as follows: oil seal mechanical pump 10-105, water injection vacuum pump 102-105, oil booster pump 10-1-1, rotary vane vacuum pump 10-4-10-2.vacuum-pump-related-to-refrigeration-and-drying-applications

(2) choose the size of the pump according to the amount of gas released and the leakage of the system.

Development of rotary vane vacuum pump

Rotary vane vacuum pump is a kind of variable displacement mechanical vacuum pump which can obtain vacuum by rotating the rotor and the vane which can slide in the rotor groove. When the working fluid is used to lubricate and fill the dead gap in the pump cavity, separating the exhaust valve from the atmosphere, it is commonly referred to as the oil seal rotary vane vacuum pump. Without working fluid, it is dry rotary vane vacuum pump.

In the oil seal rotary vane vacuum pump, it is customary to call the belt drive as rotary vane vacuum pump, and the pump connected directly with the motor or with a coupling is called a direct rotary vane vacuum pump. In each pump, there are single and double stages. In a single-stage pump, due to the selection of different structural forms and parameters, the pump's limit pressure and use are also different.

Their common characteristics are simple structure, easy to use, can start from atmospheric pressure, can directly exhaust the atmosphere, eccentric mass is small, easy to maintain, the limit pressure of two-stage pump is 6.

Since W. Gaede invented the rotary vane pump in 1909 and obtained a German patent, he invented the air-ballast pump in 1936, and obtained a patent in 1941, the rotary vane vacuum pump has been widely used and continuously improved. At the end of the 1960s, there was an international trend of increasing speed and miniaturization of direct links. In the early 1970s, direct links appeared. By the early 1980s, a series of improved products were introduced. There were a variety of accessories for users to choose, which could protect the pump or the environment. The reliability of the pump was improved by improving its structure.Roots_Vacuum_Pump

Vacuum pump oil

Additives in vacuum pumps are also gradually consumed in the use of failure, resulting in functional decline, the occurrence of harmful components of equipment, known as aging or degradation, aging and degradation to a certain extent after the damage to the equipment is greater than its good effect, it is necessary to replace new oil.

Generally speaking, the degradation of vacuum pump oil is a reaction process dominated by hydrocarbon oxidation, which is followed by sound field aldehydes, ketones, alcohols to organic oxyacids. Each reaction is accompanied by varying degrees of differentiation and polymerization. The central product is hydrocarbon peroxides, which are highly active and unstable compounds, and are easy to break into metals and form special compounds. Other wear and faults, high-level vacuum pump oil is rich in highly effective antioxidant additives, can delay the degradation of vacuum pump oil or reduce the degradation of products to the damage of vacuum pump.oil_diffusion_pump

Generally speaking, the connotation of vacuum pump oil will change when it rotates at high temperature and high speed for a long time. For example, the vacuum pump oil emits the same water as stinky gutter after it has been used for a certain time, 80% of which is due to emulsification. If the material is sticky, then it is carbonized.

What are the specifications of piston vacuum pumps?

(1) the body is neat, the parts are intact, and the quality meets the needs. ,
(2) vacuum gauge, ammeter and so on are complete, flexible and accurate, and have the symbol of periodical inspection.
(3) The base is stable and reliable, the anchor bolts and all parts of the bolts are tightly and tightly connected, and the length of the threads is in accordance with the rules.Vacuum_Pump
(4) pipeline, valves and other devices are reasonable, symbolize clearly, fit the needs.
(5) the gap between parts of the parts and components should reach the regular requirement.

What are the functions of piston vacuum pumps?

(1) The equipment is smooth and outstanding, the oil quality meets the demand, the implementation of "Five Directions" and "Three Equipment" work smoothly and without noise, its oscillation and noise should not exceed the relevant rules of equipment load work, temperature, pressure, flow, current and other parameters should be consistent.Molecular_Pump.

Small vacuum pump

A vacuum is a given space, and the gas pressure is less than 101325Pa. In a vacuum, the pressure and fineness of the gas are usually marked in natural gas, and it is obvious that ghost stories, smaller pressure values, indicate the more indifferent the gas. There are many kinds of industrial vacuum pumps, and the testing methods for various functions of pumps need to be inspected. The main parameters are:

1. Limit Vacuum: After the vacuum vessel is connected with the inspection, bin Laden pumps water continuously for a long time. After the gas is buried in the North Arabian Sea, when the pressure of the gas in the vessel does not drop to maintain a certain value, this pressure is called the limit vacuum of the pump. The smaller the value, the closer the theoretical vacuum is.Water-ring-vacuum-pump-performance.

2, pumping speed: in the suction port, through the gas volume unit time vacuum.
A wide range of industrial uses of traditional vacuum pumps, pump operations require exceptional vacuum pump oil, lubricants, CNPC gas included in many of the Council's fog.vacuum-pump-oil-selection

The cost and index of vacuum pump are closely related. Vacuum policy is an important policy sought by the state, which reflects the overall strength of the corresponding processing, sealing technology, material science and other fields, but also an important way for manufacturers to profit. The policy is that before entering a vacuum, we must have higher sealing conditions, so we need to adopt more precise standards, very functional parts, and therefore produce materials that cost substantially more. The increase in price index is much larger than that in vacuum.
vacuum-system-commonly-used-electromagnetic-valve

How to prevent cavitation erosion in water ring vacuum pump

The water ring vacuum pump is equipped with an eccentric rotor with fixed blades. The water (liquid) is thrown into the stator wall to form a liquid ring concentric with the stator. The liquid ring together with the rotor blade forms a variable volume rotary variable volume vacuum pump.Molecular_Pump

Water-ring vacuum pump was originally used as self-suction pump, and then gradually used in petroleum, chemical, mining, pharmaceutical and food industries and many other sectors. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used.oil_diffusion_pump

Rotary vane vacuum pump rotor

Rotary vane vacuum pump is mainly composed of pump body (stator) and rotor. The rotor slot is equipped with more than two rotating blades, and the rotor is eccentrically installed in the pump cavity. The gap between the outer edge and the top surface of the pump cavity is 2-3 microns.

When the rotor of the vacuum pump rotates, under the action of centrifugal force, the rotary blade slides reciprocally along the groove and keeps in contact with the inner wall of the pump chamber. The pump chamber is divided into two or several variable volume workshops. When the rotor rotates clockwise, the volume of the suction chamber connected with the suction port increases gradually from zero, and the pressure of the gas in the cavity decreases. The suction gas is continuously inhaled from the suction port.

At the same time, the volume of the exhaust chamber connected with the exhaust port decreases from large to small, and the gas in the suction chamber is compressed. When the gas pressure is higher than the atmospheric pressure, the exhaust valve is pushed open to discharge the atmosphere. When the rotor rotates continuously, the pump will continuously exhaust.Roots_Vacuum_Pump

Roots vacuum pump of performance characteristics

Roots vacuum pump is a kind of variable displacement vacuum pump which has two blade rotors rotating in opposite directions synchronously. There are small clearances between the rotors and between the rotors and the inner wall of the pump shell, but they do not contact each other. Roots vacuum pump can not be pumped alone. The front stage needs oil seal and water ring to discharge the air directly.vacuum-pump-system-maintenance

When the roots vacuum pump works, the suction port is connected to the vacuum pump or vacuum pump. This vacuum pump rotor and rotor, rotor and pump shell between each other do not contact, the gap is generally 0.1-0.8 mm; do not need oil lubrication. Due to the continuous rotation of the rotor of the vacuum pump, the exhaust gas is sucked from the inlet into the space V0 between the rotor and the pump shell, and then discharged through the exhaust port.dry-vacuum-pump-selection

How to use vacuum pump oil more effectively?

Vacuum pump is a device to improve, generate and maintain vacuum in a closed space by various means. According to the working principle of vacuum pump, vacuum pump can be basically divided into two types, namely gas capture pump and gas transmission pump. It is widely used in metallurgy, chemical industry, food, electronic coating and other industries. The correct use of vacuum pump oil is very important to the normal operation of the vacuum pump, how to use the vacuum pump oil more effectively.

On the cleanliness of vacuum pump oil and Its Countermeasures:

1. Oil windows must be clean and clean. It is forbidden to be exposed in the sun and stored in the open air. It should be stored in dark, dry and ventilated places. It is strictly waterproof and dusty.

2, refueling appliances must have special equipment, should not be filled with other oil or solvent containers; pump.

3. When taking oil or filling oil, the light rain around the barrel cover must be removed to prevent sundries from mixing into the oil and causing wear and tear of the pump.

4. When changing oil, the oil used in the pump body should be exhausted, the new oil should be poured into the slowly rotating pump shaft, cleaning the pump cavity exhausted residual oil, repeated cleaning several times, etc. after washing into new oil.

5. When mineral oil is interchanged with ester oil or other synthetic oil, the vacuum pump should be disassembled for thorough cleaning. All parts and components must be immersed in ester oil to prevent contamination.

6. When the vacuum pump is overhauled, the parts of the pump must be cleaned and dried with solvent or cleaning agent.Molecular_Pump

Single stage rotary vane vacuum pump

Single-stage rotary vane vacuum pump is an oil-sealed rotary mechanical vacuum pump, can be used alone, can also be used as a high vacuum front-stage pump, that is, can and booster pump, oil diffusion pump unit.

As a single stage rotary vane vacuum pump, there is only one workshop. It consists of stator, rotor and rotary vane. As shown in the following figure. The rotor is placed eccentrically in the stator. Two rotor plates are installed in the rotor tip, and springs are arranged between the two rotating pieces. Depending on the spring force and centrifugal force when the pump rotates, the rotary blade is tightly attached to the pump wall.Roots_Vacuum_Pump

Generally, the pump cavity is divided into three parts: the space from the bamboo intake to the rotating blade is called suction (space, the space from the two rotating blades with the pump wall is called expansion compression space; the space from the exhaust valve to the rotating blade is called exhaust space). If the rotary vane is in the vertical filling position, the pump chamber is divided into two parts, that is, the inspiratory space and the exhaust space. But no matter where the rotary piece is, it always separates the intake valve from the exhaust port. The purpose of the exhaust valve is to prevent atmospheric reflux from entering the pump. In order to prevent sudden power failure of vacuum pump oil back into the vacuum container, an electromagnetic valve is installed on the intake pipe. Once power failure, the electromagnetic valve will be blocked with the passage. When the pump is pumped on, the electromagnetic valve sucks up and the passage opens.

Floating scroll dry pump

With its unique performance advantages, scroll dry pump has been widely expected in the vacuum cleaning equipment industry. Because of the weakness of sealing technology and machining precision, the traditional vortex dry pump can not give full play to the performance advantages of oil-free vortex compression technology in many applications, thus limiting its large number of applications.dry-vacuum-pumps-classification

Floating oil-free scroll dry pump, through fine force balance, gives full play to the performance advantages of oil-free scroll compression technology, so that it becomes the most anticipated new product in the field of clean vacuum equipment.oil-diffusion-vacuum-pump-concept

The basic working principle of the vortex vacuum pump and the problems of sealing and machining precision existing in the traditional vortex dry pump are analyzed. Then the structure characteristics and performance advantages of the floating vortex dry pump are introduced. Finally, the overwhelming performance advantages of the micro-floating vortex dry pump are clarified by comparing the experimental data, and the market development in the future is advanced. We have gone ahead.high-speed-direct-rotary-vane-vacuum-pump

Overall structure of vacuum pump

The overall structure of the pump is determined by the arrangement of the pump body.

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

The inlet of the horizontal pump is on the top and the exhaust port is below. Sometimes in order to facilitate the installation and connection of the vacuum system pipeline, the exhaust port can be connected from the horizontal direction, that is, the inlet and exhaust directions are perpendicular to each other. At this point, the vent can be opened from the left or right direction, in addition to connecting one end of the exhaust pipe, the other end blocked or connected to the bypass valve. The pump has a low center of gravity and good stability at high speed. This structure is commonly used in large and medium sized pumps.

The two rotor shaft of the pump is installed vertically along the horizontal plane. This kind of structure is easy to control the assembly clearance, the assembly of the rotor is convenient, and the pump occupies a small area. But the pump center of gravity is higher and the gear is disassembled and disassembled, so the lubricating mechanism is relatively complicated.

How to replace oil in water ring vacuum pump

Water ring vacuum pump is a commonly used equipment in industry. After a period of use, the equipment needs to be changed to ensure the normal operation of the equipment. As the job is more professional, it is best to change oil by professionals, oil change operation as follows:

1, when changing the oil, it is not suitable to start the motor for a long time, so as not to cause the exhaust valve to jump too violently and fatigue.

2. Remove the water ring vacuum pump from the vacuum system, pad one end of the chassis motor higher, open the oil discharge plug, rotate the vacuum pump, cover the exhaust port, so that all the dirty oil in the cavity is discharged from the oil outlet, and then add 100-500 ml of new oil into the air inlet to continuously rotate more than 5-10 revolutions, internal cleaning, according to this operation 3-5 times, special dirty oil After discharging, install the oil stopper, level the pump, add new oil from the inlet and the filling hole respectively, and the oil change is finished.

3, strictly prohibit the use of kerosene, gasoline, alcohol and other pumps for non demolition cleaning.

Vacuum pump unit

In the process of continuously enhancing the advantages of product utilization, we should give full play to the overall application of vacuum pump units and the strength of products to drive, speed up the development of overall application advantages, combine with the development of product strength and performance advantages, and realize the overall advantages of its products according to the improvement of overall application ability in all aspects. The effect of continuous development, with high-efficiency product use strength, improve the practical basis of its products in all aspects of play, to achieve the quality of the unit and other application performance improvement.roots-vacuum-pump-manufacturer

Accelerate the promotion of the overall product capacity of vacuum pump unit, combine with the improvement of its quality and other application strength, with high efficiency and practical effect, constantly enhance the exertion of its product application ability, through the practical application of the product reflects the improvement of its inherent superiority ability, realize the overall application effect of its quality, so as to improve its performance. Utilize the value strength of the overall play, effectively reflect the equipment's high-efficiency operation advantages, so as to give full play to the high-quality performance of its product application effect.vacuum-parts-bellows

Therefore, it is necessary to improve the application ability of vacuum pump unit products, to achieve the effective play of the overall application performance of the product, according to the reliable quality strength, reflecting the performance of the equipment, with high-performance product strength to constantly drive the role of the advantages of its products, to speed up the overall use of product strength of the pioneering performance.Rotary-vane-vacuum-pump-in-food-processing-application

Rotary vane vacuum pump and compressor

Rotary vane vacuum pump is a two-stage structure. Its working performance consists of two parts: high-pressure stage and low-pressure stage. Its suction port is connected with the vacuum container or vacuum equipment. During operation, the gas in the container will be sucked and discharged. When the equipment is vacuum, the high-pressure exhaust valve disc will be closed, the high-pressure suction gas will be transferred to the second stage, and the second stage suction and discharge, so that the vacuum equipment can obtain a certain vacuum. The technical parameter of the pump is 6 * 10-2Pa. According to the user's usage, can be equipped with vacuum booster pump (such as Roots pump), the rotary vane vacuum pump as the front pump, because the booster pump pumping force is strengthened, the front pump continuously removed, can make your equipment get higher vacuum pump.Molecular_Pump

Rotary vane vacuum pump and compressor are used to pump or compress air and other non-corrosive, insoluble in water, does not contain solid particles of gas, in order to form a vacuum and pressure in an airtight container. Rotary vane vacuum pump is widely used in extruder, water diversion, petrochemical, pharmaceutical, food, sugar industry and electronic fields. Because the process of gas compression is isothermal in the working process, it is not dangerous to compress and suck explosive gas, so it is more widely used.

Liquid ring vacuum pump

The liquid ring vacuum pump needs working fluid, which is continuously discharged from the pump body together with the exhausted gas. Therefore, the liquid ring must continuously supply fresh cooling working fluid. In addition to the basic function of forming water rings, working fluids also emit heat generated by compressed gases and seal the gap between the impeller and disk. At present, factories generally use tap water as working fluid. The working fluid must not contain any solid impurities, such as sand, or the pump will be seriously worn, machine failure.

In the long-term use of liquid ring vacuum pump, we also found that the use of tap water as working fluid will produce scales in the impeller and other parts, because tap water has a certain degree of hardness, long-term operation of the machine water calcium, magnesium ions will be adsorbed on the relevant parts of the machine, resulting in thick scales, so that the machine has blocked rotation and so on. In order to solve this problem, we consider to develop a softening water system, using soft water as working fluid of liquid ring vacuum pump, because there is no calcium, magnesium ions in soft water will lead to the formation of scale ions, avoiding the occurrence of scale.

Roots vacuum pump unit structure

Roots vacuum pump has the characteristics of small volume, smooth operation, high speed, large pumping speed in a wide pressure range, no friction in the pump and clean vacuum. Roots vacuum unit is the most common coarse, low and medium vacuum acquisition unit in vacuum system. It can work independently and can also be used as the front-stage pump and pre-pump of other pumps. Therefore, Roots vacuum unit has been widely used in metallurgy, petrochemical industry, light industry paper making, electronics and food industry.

vacuum pump is divided into low vacuum (direct air exhaust) roots pump and medium vacuum roots pump (mechanical booster pump) according to the working pressure range. When Roots pump operates under the condition of high pressure difference, because of the heat generated in the compression process, there is a big temperature difference between the rotor and the pump body, which causes the rotor in the pump cavity to be stuck because of expansion, so it can not work for a long time under high pressure difference. Air-cooled Roots vacuum pump can withstand high pressure difference and can be used for direct air exhaust. However, when the system is pumped rapidly from atmospheric pressure to process requirements, Roots vacuum pump needs large shaft power to start pre-pumping. In the stable operation stage of the system, only a very low pressure difference is needed, and only a small shaft power is needed to maintain operation. Reasonable configuration of relief valve can allow roots pump to start under high discharge pressure, and reduce the requirement of shaft power in start-up stage by controlling its pressure difference to keep within a certain range, so as to reduce the allocation of motor power of roots pump. Therefore, through the combination of Roots vacuum pump configuration and use of vacuum relief valve, can save energy and reduce consumption, improve the reliability of product operation purposes.

Vacuum pump rotor

Rotary vane vacuum pump is mainly composed of pump body (stator) and rotor. The rotor slot is equipped with more than two rotating blades, and the rotor is eccentrically installed in the pump cavity. The gap between the outer edge and the top surface of the pump cavity is 2-3 microns. When the rotor of the vacuum pump rotates, under the action of centrifugal force, the rotary blade slides reciprocally along the groove and keeps in contact with the inner wall of the pump chamber. The pump chamber is divided into two or several variable volume workshops. When the rotor rotates clockwise, the volume of the suction chamber connected with the suction port increases gradually from zero, and the pressure of the gas in the cavity decreases. The suction gas is continuously inhaled from the suction port. At the same time, the volume of the exhaust chamber connected with the exhaust port decreases from large to small, and the gas in the suction chamber is compressed. When the gas pressure is higher than the atmospheric pressure, the exhaust valve is pushed open to discharge the atmosphere. When the rotor rotates continuously, the pump will continuously exhaust.

Rotary vane vacuum pump is a kind of variable capacity mechanical vacuum pump, which uses the rotor of vacuum pump and the rotary motion of the rotary vane which can slide in the rotor groove to obtain vacuum. The rotor of vacuum pump is the core part of the vacuum pump cavity, one of the main parts, is one of the key factors to ensure the normal operation of the vacuum pump.

Water ring vacuum pump

The water ring vacuum pump is equipped with an eccentric rotor with fixed blades. The water (liquid) is thrown into the stator wall to form a liquid ring concentric with the stator. The liquid ring together with the rotor blade forms a variable volume rotary variable volume vacuum pump.

Water-ring vacuum pump was originally used as self-suction pump, and then gradually used in petroleum, chemical, mining, pharmaceutical and food industries and many other sectors. In many industrial processes, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used.

Roots vacuum pump of application

The great advantage of Roots Vacuum Pump is that it has a higher pumping rate at lower inlet pressure, but it can not be used alone. It must be connected in series with a front-stage vacuum pump. In this case, Roots vacuum pump is not allowed to work under high pressure difference, otherwise it will be overloaded and overheated and damaged, so the use of Roots vacuum pump must be reasonable selection of the front vacuum pump, installation of necessary protection equipment.water-ring-vacuum-unit

Generally, the front-stage vacuum pump can choose oil seal mechanical pump or liquid ring vacuum pump, especially in the extraction of a large amount of steam gas, water ring vacuum pump as the front-stage pump is ideal.Vacuum-pump-unit

vacuum pump of starting

Vacuum pumps and compressors are widely used in machinery, petrochemical, pharmaceutical, food, sugar industry and electronics, so it is necessary for us to understand its little knowledge, the following is about the start of vacuum pumps.

After a long period of shutdown, the vacuum pump must rotate the coupling by hand for a week before starting to verify whether it closes the gate valve on the intake pipe of the pump and starts in the following order.

1. Close the gate valve on the intake pipe of the vacuum pump.
2, if the exhaust pipe of the gas water separator is equipped with a gate valve, it should also be closed.
3. Full open spherical valve on stuffing pipe.
4. Fully open gas water separator to pipeline for pump feed water.
5. The gate valve of the water supply pipeline which is fully supplied to the gas water separator is fed into the separator to the height of the overflow pipe.

6. When the water of the gas separator reaches the horizontal plane specified by the scale of the overflow pipe, the motor is started.
7. Open the gate valve on the separator exhaust pipe.
8. Open the gate valve on the intake pipe of the pump.
9. Adjust the water delivered to the pump by the separator with a spherical valve so as to reduce the power consumption of the motor within the specified technical range.
10. Adjust the gate valve which feeds water to the separator so as to reduce water consumption and ensure the technical specifications required by the pump.
11, adjust the water supply to the stuffing box, so as to ensure the tightness of stuffing box with less water consumption. When the vacuum pump operates in the limit, the burst sound occurs because of the physical action in the pump, but the power consumption does not increase accordingly. When the burst sound accompanied by increased power consumption occurs, indicating that the pump is not working properly at this time should be stopped to check.

Oil return treatment of SK vacuum pump

SK vacuum pump as a commonly used modern vacuum equipment, usually when we are in use, often refueling lubrication, after a long time of use, some equipment will appear anti-oil situation, how should we deal with it?

1. The molecular weight of SK vacuum pump oil is large.Molecular_Pump

2, in order to reduce the ultimate pressure of the equipment, it is required that the saturated steam pressure of the vacuum unit oil at room temperature is low.

3. In order to make the equipment work under higher outlet pressure, the saturated vapor pressure of SK vacuum pump oil at boiling temperature should be as high as possible.

4. The thermal stability of SK vacuum pump oil will not be better when it contacts with the atmosphere. Freezing point and low temperature viscosity should be low.

Usually when SK vacuum pump is used, lubricating oil has a great influence on the limit pressure. In the diffusion vacuum unit with the same structure, the partial pressure of the pumped gas will also change with the pump oil. In the later stage, we should pay more attention to these points when refueling.

Rotary vane vacuum pump working principle

Rotary vane vacuum pump (rotary vane pump) is an oil sealed mechanical vacuum pump. Its working pressure range is 101325~1.33 * 10-2 (Pa), which belongs to the low vacuum pump. It can be used alone or as a front pump for other high vacuum pumps or ultra high vacuum pumps. It has been widely used in metallurgy, machinery, military industry, electronics, chemical industry, light industry, petroleum and pharmaceutical production and scientific research departments.Water-ring-vacuum-pump-working-principle

Rotary vane pump can extract the dry gas from the sealed container. If it is equipped with a gas-holding device, it can also extract a certain amount of condensable gas. But it is not suitable for the extraction of oxygen-rich, corrosive to metals, chemical reactions to pump oil, and gas containing particulate dust.turbine-molecular-pump-manufacturer

Rotary vane pump is one of the most basic vacuum equipment in vacuum technology. Rotary vane pumps are mostly small and medium sized pumps. Rotary pump has two kinds: single stage and double stage. The so-called two-stage structure is to connect two single stage pumps in series. It is usually made in two stages to achieve higher vacuum.liquid-ring-vacuum-pump-structure

Working principle of water ring vacuum pump unit

For the corrosion-resistant water ring vacuum pump unit, we will actually use the Roots pump as the main pump in actual use, and then, we should pay attention to the water ring pump should be formed for the previous pump series.

Corrosion-resistant water-ring vacuum pump unit selected by the water ring pump to a large extent will actually become a front-end pump, in this respect, it is actually more advantageous than other vacuum pumps, because it can not only overcome a single water-ring pump operating time limit pressure difference (unit limit pressure) In fact, it will be higher than the limit pressure of the water ring pump in fact, that is, there will be a great deal of improvement, under a certain pressure on the drawback of a relatively low pumping rate, in this respect, we will actually note that it is to a great extent directly retained the Roots pump energy of the rapid operation, there is a relatively large amount of pumping. The advantages of speed.

Next, as far as the corrosion-resistant water-ring vacuum pump unit is concerned, it can actually be adapted to remove a large number of condensable steam, especially for the gas-filled oil seal mechanical vacuum pump to remove condensable steam capacity is not enough, or the use of solvents can actually make the pump oil deterioration, thus affecting The performance will be even more obvious when the vacuum system does not allow oil contamination.

As far as the corrosion-resistant water ring vacuum pump unit is concerned, when it is equipped with explosion-proof motor and its electrical appliances, to a large extent, it will directly comply with the corresponding safety rules, but also can extract flammable and explosive gases. In view of the above reasons, its application will be very extensive.

Filter element of vacuum pump

In this respect, it is also an important working part of the filter, and then, in terms of filtering effect, it mainly depends on the performance of the filter. There will be more filtering forms in its operation.

First of all, it will include an air-inlet filter element. In this respect, it works to a great extent, which is actually more effective in preventing solid particles and their fine ash from being sucked into the vacuum pump. In this way, to a great extent, it will directly reduce a wear phenomenon of the machinery itself, in order to improve the reliability of the operation itself. While we prolong the service life of the pump, it is actually an effective protection system itself components.

As far as the filter element of vacuum pump is concerned, it will actually include an exhaust filter element, which takes into account both the exhaust resistance and its dust capacity and the separation performance of oil and gas, and the requirements of the three are in fact able to achieve the optimal balance. Different internal and external locations should be made of different materials in anticipation of different separation purposes.

Next, as far as its oil filter element is concerned, it will be used in the imported vacuum pump to filter the lubricating oil to a great extent, so that, to a certain extent, it will directly extend the life of the oil itself mainstream filter, installed in the oil circuit.

Finally, in terms of the use and maintenance of the vacuum pump filter element, first of all, we should pay attention to the fact that should be loosened knob bolt directly on the filter shell and head separation. Be careful not to lose the rubber sealing ring and the fiber washer. Carefully remove the springs and felt gaskets of the vacuum pump equipment, followed by careful removal of the paper core.

Overall structure of vacuum pump

When it comes to the overall structure of the vacuum pump, the layout of the pump body of the vacuum pump, to a large extent, will also directly determine the overall structure of the pump itself in a timely manner. As for the vertical structure of the vacuum pump inlet and exhaust port level settings, its assembly and connection pipeline is actually more convenient. However, the center of gravity of the pump is actually quite high.

Furthermore, when it comes to horizontal pumps in vacuum pumps, we'll actually find that the inlet is above, but on the other hand, we'll actually find that the exhaust is below. Sometimes, to a great extent, it is to facilitate the installation and connection of the vacuum system pipeline, so that the exhaust outlet can be directly connected from the horizontal direction, which means that the inlet or exhaust direction is actually perpendicular to each other.

At this time, the vent on the vacuum pump can be opened directly from the left or right to a large extent, in addition to one end of the exhaust pipe, the other end is actually blocked or connected by-pass valve. This kind of vacuum pump structure on the center of gravity actually will be relatively low, high-speed operation when the stability is better. In general, large and medium-sized pumps actually use this structure.

The two rotor shaft and horizontal plane of the vacuum pump are installed vertically. For this kind of structure assembly clearance is easy to control, rotor assembly is actually more convenient, and its pump area is smaller.

Finally, the two rotors of the vacuum pump, to a large extent, should be noticed to be directly through a pair of high-precision gears to achieve its relatively synchronous operation. The main shaft of the vacuum pump is connected to a large extent by coupling and motor. In fact, there is a great demand for its transmission structure.

Piston vacuum pump

Piston vacuum pump working principle, piston vacuum pump selection and other information. Piston vacuum pump is a reciprocating vacuum pump. It relies on the reciprocating motion of the piston to make the working volume of the pump cavity (cylinder) periodically change to pump air. When working, the suction pipe is vacuumed and the exhaust pipe passes through the atmosphere. Piston vacuum pump pumping capacity is large, pumping rate range is 45-20,000 cubic meters per hour, single-stage pump limit pressure is about 103 Pa, two-stage pump can reach 1 Pa. Piston vacuum pump can be used in vacuum distillation, vacuum concentration, vacuum crystallization, vacuum filtration, vacuum drying and concrete vacuum operation. If a condenser is installed at the suction port of a piston vacuum pump, the gas containing water vapor can be extracted; if a filter is installed, the gas containing dust can be extracted.2BV_series_Liquid_ring_vacuum_pump

Piston vacuum pumps are divided into dry and wet ones. Dry pumps can only pump gas, and wet pumps can draw gas and liquid mixture. There is no principle difference in the structure between the two, but the dead space and valve mechanism of the wet pump is larger than the dry pump, so the limit pressure of the wet pump is higher than the dry pump. Piston vacuum pump has two types of horizontal and vertical (domestic W and WL). Vertical pumps are more advanced in structure and performance. They are upgrading products of horizontal pumps.Molecular_Pump

Roots vacuum pump of development

Roots vacuum pump evolved from roots blower. Roots blower can compress the gas to 0.1-2kg/cm outlet pressure under normal atmospheric pressure at the suction inlet, which can be used as blast in smelting industry. Roots vacuum pump is similar in structure and principle to roots blower, so the same name is used.

In the middle of the twentieth century, the development of vacuum technology, especially the requirement of vacuum smelting of high-grade alloys in Shanyu, required a new type of vacuum equipment with large pumping speed in the smelting vacuum system when the vacuum degree was 1-10-2 Torr. At that time, the oil seal mechanical vacuum pump suitable for low vacuum work and the oil diffusion pump suitable for high vacuum work were not able to undertake this task well. Because the oil seal mechanical vacuum pump in 1 ~ 10 - 2 Torr, the pumping speed is seriously reduced, the work efficiency is very low, such as reluctant to make it bear a large pumping speed, the need for more than one parallel work, will inevitably cause great waste. As for the high vacuum oil diffusion pump, it can not work under such inlet pressure. Therefore, in this case, we must design a new type of vacuum pump with high pumping speed and high efficiency.

Noise of water ring vacuum pump

The normal sound of water ring vacuum pump is caused by water ring eddy current. After the pump exceeds the critical compression ratio, the air pressure discharged from the pump can not resist the air pressure at the exhaust orifice, resulting in the increase of the gas back pressure in the pump, which is transmitted to the water ring and causes the flow rate to slow down. At first, swirl is formed only in the outermost part of the water ring which is close to the pump body between the suction hole and the exhaust hole. Then with the further increase of the back pressure of the exhaust hole, the range of swirl is enlarged, and the volume of suction space and the effective cross section of the suction hole are gradually reduced, resulting in the decrease of the stomatal children.medical-vacuum-pump

The water ring eddy current formed when the critical compression ratio exceeds the critical compression ratio causes periodic fluctuation of gas pressure and gas volume in the pump, resulting in the sound of the pump. The sound intensifies as the compression ratio increases, but the shaft power does not rise much. When the maximum compression ratio is reached, the air flow is zero, and the whole water ring from the suction hole to the exhaust hole forms vortex, which makes the air flow pulsation and noise level reach the maximum. This noise is related to the circumferential velocity of the pump, suction pressure, pump wall thickness, gas-water separator structure and water supply basin. For running pumps, if the water supply is properly adjusted, the sound may be reduced.oil-free-vacuum-pump.

Installation of Roots vacuum unit

The efficient operation of Roots Vacuum Unit is inseparable from the cooperation of each component. As an important part of Roots Vacuum Unit, the trap valve is an important part of the installation. What matters needing attention? Here, we will understand together.

1. When the installation status needs to be changed, attention should be paid to the pump and separate, and the connection line should not be too long, otherwise when steam and water move along the pipe, it will add outlet resistance, reduce the vacuum, add Roots vacuum unit power consumption.

2, we should also pay attention to the use of sealed gaskets in the field where the connection should be made, so as to ensure that they are not disclosed.

3, roots vacuum unit supply water pipeline and filler supply line should be linked together.

Screw vacuum pump start-up and shutdown steps

The screw vacuum pump is equipped with a migrant rotor with fixed blades, which throws water into the stator wall. The water forms a liquid ring concentric with the stator, and the liquid ring and the rotor blade together form a variable volume rotary displacement vacuum pump. So what are the starting and stopping processes of screw vacuum pumps? Here we will understand in detail.

A screw vacuum pump that has been shut down for a long period of time has been started and needs to be rolled several times by hand to prove that the pump is not jammed or otherwise damaged. At this point the need to open the exhaust valve, start the motor, but pay attention to the positive rotation of the motor, and then gradually add water supply, water supply compliance rules to request a stop, at this point should be careful not to do the task of vacuum pump.

When the screw vacuum pump stops, if there is a valve in the intake pipe, the valve on the intake pipe should be blocked at this moment, then the water supply pipe should be blocked, and the vacuum pump should be shut down quickly, and also pay attention to the water in the cavity of the screw vacuum pump should be released after the shutdown, to avoid re-starting, will constitute a blade and pump shaft cracking.

Water ring vacuum pump and rotary vane vacuum pump

Various types of vacuum pump specifications, the use of more is the water ring vacuum pump and rotary vane vacuum pump, it is very complex when many people choose to mix the two, then water ring vacuum pump and rotary vane vacuum pump what is the difference?

The water-ring vacuum pump is a kind of coarse vacuum pump, which is called water-ring pump for short. The limit vacuum it can obtain is 2000-4000Pa. Assuming the series of atmospheric radiators, it can reach 270-670Pa. Water ring vacuum pump is widely used in industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum dilution, vacuum moisture regain and vacuum degassing. Because the gas in the water ring pump is isothermal, so often can also extract flammable, explosive gas, in addition can also extract dust, water-bearing gas, in the pump body of the ordinary demand for excessive water as working fluid.

Rotary vane vacuum pump is an oil-sealed mechanical vacuum pump, referred to as rotary vane pump, its operating pressure scale is 101325 ~ 1.33 *10-2 (Pa), due to low vacuum pump. Rotary vane vacuum pump can be used independently or as the front-stage pump of other high vacuum pumps or ultra-high vacuum pumps, mainly used in metallurgy, machinery, electronics, chemical industry, light industry, petroleum and other production and scientific research departments. Rotary vane vacuum pump can remove the monotonous gas in the sealed container, assuming that there is a gas ballast equipment, but also can be used to extract a certain amount of condensable gas. However, it should be noted that the rotary vane vacuum pump can not be used to remove oxygen-rich, corrosive to metals, pump oil will react chemically and contain particles of dust gas. Rotary vane pumps are mostly small and medium sized pumps. Rotary pump is divided into single and double stages.

Requirements of 2BV vacuum pump for pump oil

The 2BV vacuum pump is suitable for extracting gas and water vapor. The suction pressure can reach 33 mbar absolute pressure (97% vacuum degree). The following are the requirements of 2BV vacuum pump for pump oil:

The sealing property of 2BV vacuum pump oil. 22BV vacuum pump has a great demand on the sealing property of 2BV vacuum pump oil. The 2BV vacuum pump oil needs a certain viscosity, which can make the 2BV vacuum pump set rotate rapidly at low temperature. Under high temperature conditions, pump oil must be well sealed, so that the pump oil in the pump has a lower temperature difference.

2BV vacuum pump oil must have a certain saturated vapor pressure. Saturated vapor pressure is an important index for measuring 2BV vacuum pump oil. It refers to the saturated vapor pressure at which gas and liquid reach a dynamic equilibrium in a closed vessel at constant temperature.

The smoothness of 2BV vacuum pump oil. This is because wear surfaces and external fatigue are more prone to wear, both are related to smooth conditions. Good performance of 2BV vacuum pump oil can be conducive to the control of wear corrosion, can effectively reduce the degree of wear.

For the use of 2BV vacuum pump, during this period must add the correct pump oil, in order to ensure the normal operation, usually in the use should also pay more attention to.

Mechanical principle of water ring vacuum pump

The water-ring vacuum pump we usually use is long used as a self-suction pump, and then gradually used in petroleum, chemical and many other industrial sectors. Vacuum filtration, vacuum moisture regain and vacuum degassing are widely used in many industrial processes. Do you know the mechanical principle of water vacuum pump?

In the water ring vacuum pump body, proper amount of water is used as the working fluid. When the impeller rotates clockwise, the water is thrown around by the impeller.

Due to the centrifugal force, the water forms a closed ring which is approximately equal in thickness depending on the shape of the pump chamber. The inner surface of the lower part of the water ring is just tangent to the hub of the impeller, and the upper inner surface of the water ring is just in contact with the tip of the blade. A one-month conodont space is formed between the hub and the water ring of the impeller, and this space is divided into several small cavities equal to the number of blades. If the lower part of the impeller is taken as the starting point, the volume of the small cavity increases from small to large at 180 degrees before the impeller rotates, and is connected with the suction port on the end face. At this time, the gas is sucked in, and the small cavity is isolated from the suction port at the end of the suction. When connected, the gas is discharged out of the pump.

The water-ring vacuum pump is a variable-volume vacuum pump because it can suck, compress and exhaust air by changing the volume of the pump cavity. Due to the rapid development of vacuum technology, attention has been paid to obtaining coarse vacuum. Because the gas compression in water ring vacuum pump is isothermal, it can extract flammable and explosive gases, in addition, it can also extract dust, water-bearing gases, therefore, the use of increasing.

Application of Roots vacuum pump

The practicability of Roots Vacuum Pump can be seen from the whole state of its development, so that it can continuously increase its performance advantages. In the process of strengthening the overall construction and improvement of products, it is necessary to strengthen the development state of its overall foundation. According to the actual production capacity, it is necessary to expand the production of products to improve the processing level of each component. Only in this way can we continue to provide reliable product development for users according to the market demand, and expand its overall application ability for future development.

In order to embody the practicability of Roots vacuum pump, through the promotion of the basic ability of all aspects of the product and the enhancement of the actual development of the product, under the overall strength of constantly improving the development of the product foundation, according to the effective embodiment of its production capacity, thus more reflecting the enhancement of practical application ability, and constantly improving its products. In the application effect, to effectively expand the practical application ability of the product, so as to further enhance the development of the overall practical ability, reflecting the strength of the product.

The continuous improvement of the application process is very important for the development of Roots vacuum pump. To further develop and apply Roots vacuum pump and improve its overall strength, only by relying on advanced technical performance advantages can we enhance the overall utilization of products effectively.

Performance of vacuum pump oil

1. Tightness of vacuum pump oil:

Vacuum pump oil needs to have appropriate viscosity, can make the vacuum pump start quickly at low temperature, vacuum pump oil can have good sealing at high temperature, vacuum pump oil has a low temperature rise in the pump. It does not contain light volatile components and reduces the oil return rate of vacuum pumps during operation.

2. Saturated vapor pressure of vacuum pump oil:

Saturated vapor pressure is one of the key indicators of vacuum pump oil. In a constant temperature closed container, when vapor liquid two phase is in dynamic equilibrium, the pressure term is saturated vapor pressure.

The saturated vapor pressure of oil products should be as low as possible. At the highest working temperature of the pump, the saturated vapor pressure should be sufficiently low and should be lower than the limit pressure stipulated by the vacuum pump. The saturated vapor pressure will drop by about an order of magnitude for every 20 C rise in temperature, at least 6.5 10 - 5 kPa at 60 C.

3. Limit total pressure and limit pressure of vacuum pump oil:

Limit total pressure: The total pressure produced by all substances (gases) in the vacuum pump is measured by a Pirani gauge or a thermocouple vacuum gauge. Foreign countries now attach importance to the test target of full pressure.

Limit Partial Pressure: Limit partial air pressure of the pump measured by mercury compression vacuum gauge (Maxwell gauge) and the partial pressure of the two-stage rotary vane pump should be <6 *10-5 kPa. The difference between limit total pressure and limit differential pressure is not greater than one order of magnitude. The greater the difference between the two, the more volatile components in vacuum pump oil, the worse the nature of the oil. (Note: limit total pressure and limit partial pressure are tested by two stage high grade vacuum pump).

Roots pump

After a period of operation, the roots pump (mechanical booster pump) unit produces abnormal noise, which may be caused by the following reasons:

1. The starting pressure of roots pump is too high, resulting in overheating of pump parts and damage.
2, the larger abrasive particles produced in the production process enter the roots pump and cause the wear of the machine parts.
3, the pump's position is not right, for example: tilt placed. The amount of lubricating oil in the pump is not suitable.

All the above reasons will lead to poor precision or serious pollution of the parts of the Roots pump, thus causing abnormal noise in the operation of the Roots pump.

When it is found that the pump produces abnormal noise in operation, it should immediately check whether the starting pressure of the pump meets the prescribed value, and can use ammeter to check whether the input current of the pump motor meets the rated value, whether there is abnormal high or low. It is also necessary to check the condition of the lubricating oil in the pump and whether the pump's location is suitable.

The pump disassembly procedure is as follows:
1, release lubricating oil and cooling water;
2, disassemble the coupling and motor.
3. Remove bypass and bypass valves.
4, dismantling bearings;
5. Remove front and rear cover and sealing device.
6, remove the rotating gear;
7, remove the rotor.

Pumping principle of slide valve vacuum pump

The pumping principle of the slide valve vacuum pump is similar to that of the chip pump, when the pump structure is different.

The slide valve type vacuum pump mainly uses the slide valve mechanism to change the volume of the west air cavity, so it is called Huafa pump. Sliding valve vacuum pump is a kind of old pump, but compared with rotary vane pump, it has the outstanding characteristics of high working pressure (104pa), large pumping capacity, continuous operation in harsh environment, durable and so on. Therefore, it is widely used in vacuum smelting, vacuum drying, vacuum impregnation, vacuum distillation and other industries.

At present, oil-sealed vacuum pumps are widely used in vacuum industry, mostly small and medium-sized chip selection pumps and large and medium-sized slide valve vacuum pumps. Rotary vane pumps are stuck in rotor grooves under dirty working conditions.

Although the slide valve vacuum pump has overcome this shortcoming to a certain extent, but because the distance between the center of mass of the slide valve and the center of rotation is not fixed, although some structural balancing measures have been taken, but still can not achieve complete balance, so it is difficult to eliminate vibration. In particular, the larger the capacity of the pump, the greater the vibration. At the same time, the above two kinds of pumps, especially the slide valve pump, have larger appearance size compared with their displacement.

Water ring vacuum pump

The water ring vacuum pump is actually a crude vacuum pump. In this regard, we should pay attention to the maximum vacuum that it can obtain, which is actually 2,000 ~4000Pa. In terms of its series atmospheric injector, it can reach 270~670Pa to a large extent. And, on the water ring vacuum pump, in a certain degree will be called the compressor.

Moreover, we also is to actually pay attention to in terms of water ring vacuum pump, it in the beginning, is also used as a self-priming pump, in the case of after, actually also is gradually used in petroleum, chemical industry, as well as in the machinery, mining and light industry, medicine and food and many other industrial sectors have a very good application.

In many technological process of industrial production, common also is actually refers to the vacuum filter, and will include vacuum water diversion, vacuum feed, then, is also include vacuum evaporation, vacuum concentration and vacuum resurgence and vacuum degassing equipment, water ring vacuum pump itself also is actually would steel is widely used.

And then, what we really want to do is to pay attention to the development of vacuum application technology, the water ring vacuum pump, in terms of rough vacuum acquisition, will always be taken seriously. Because the compression of the gas in the water ring pump is to a large extent isothermal, in this case, we actually have to pay attention to the extent that it's able to remove flammable or explosive gases, in addition to that, it's able to remove dusty or water-containing gases.

And then the final thing, which is in the water ring vacuum pump, is that it's going to be directly filled with a certain amount of water as its working fluid. And, as far as the impeller is concerned, it should be rotating clockwise in the direction indicated by the impeller. In fact, water will be directly thrown around by the impeller. Because of the centrifugal force on the water ring vacuum pump, it will form a closed structure.

Maintenance and repair of vacuum pump unit

First of all, the maintenance and repair of the vacuum pump unit. First of all, the purity of the protective gas filled should not be less than 99.99%. Then, in terms of vacuum pump unit equipment, to a large extent, it is important to be careful not to use flammable, explosive and corrosive gases as a protective atmosphere.

Next, with regard to the maintenance and repair of the vacuum pump unit, the surface of the equipment and the surface of the instrument should be kept clean to a large extent. Cleaning the inner wall of the furnace shall not allow the cleaning with water or with non-vacuum oil.

Next, for the maintenance and maintenance of the vacuum pump unit, the oil-water separator on the pneumatic triples above the pneumatic system should pay attention to discharge water frequently, and the vacuum diffusion pump oil should be injected in the oil-mist device. And when the equipment is used, the voltage of the whole machine should be guaranteed in the range of 350 ~ 420 V to a large extent. The three phases need to be balanced.

In addition, we should pay attention to the regulation of the vacuum pump unit or the pressure gauge at electrical contact and the thermocouple. In other words, we should always apply the diffusion pump oil, forming a film between it and the seat, so as to prevent the leakage of the equipment. The vacuum seal sealing is not allowed to be used for a long time for each part and its flange connection. The bolts of each part should be checked regularly. When the equipment is found to be loose, it should be tightened in time.

Finally, when the vacuum pump unit is working, we should pay attention to the display on each instrument and the sound of each pump. In this way, to a large extent, it is convenient for us to find out the anomalies in time and then to find out the problems. Moreover, the use environment of vacuum pump unit, eight at below 5% relative humidity, temperature is 10 ~ 40 ℃.

Maintenance of rotary vane vacuum pump unit

In terms of the maintenance of the rotary vane vacuum pump unit, the first point is to pay attention to the maintenance of the rotary vane vacuum pump unit cleaning, and the next thing is to pay attention to the prevention of debris into the pump equipment. And then the next thing you want to do is you want to keep the oil level; In the face of improper storage, water or other volatile substances into the pump equipment to affect the maximum vacuum, attention should be paid to replace the pump oil.

Then, on the oil change on the vacuum pump unit method, first of all, is to pay attention to go to the open pump running about 10 minutes, make oil loose some, then, that is, pay attention to the pump stop, this time should be pay attention to the oil drain Kong Fang oil, to open air inlet running a 1 ~ 2 minutes, in the midst of this, namely from inspiratory mouth slowly add a small amount of clean oil pump, this also is to actually change the pump cavity of remaining oil.

Followed by vacuum pump unit maintenance, should pay attention to can not be mixed with diesel or gasoline and other full with relatively large oil vapor pressure, at that time, namely can reduce its limit vacuum, unpick and wash of pump parts, typically with gauze polishing the test also is ok, there will be a metal debris, sand, mud or other hazardous substances must be clean, we should actually is also should pay attention to is to use gasoline to scrub, also can undertake assembly after drying.

In addition, if the pump needs to be disassembled and cleaned or overhauled, it is necessary to pay attention to the disassembly steps, so as to avoid damage to the parts.

Finally, as far as the vacuum pump unit is concerned, other objects should not be placed. In the following part, it is very important to pay attention to whether the belt is elastic enough, and it should be adjusted every half a year. Check if there is air leakage on the pipe joint of the vacuum pump unit, it should be stopped in time.