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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Causes of active trip of vacuum pump

This paper analyzes the causes of the active trip of the vacuum pump. Vacuum pump refers to the equipment or equipment that uses mechanical, physical, chemical or physical-chemical methods to extract air from the container to obtain vacuum. In a word, vacuum pump is a kind of equipment to improve, generate and maintain vacuum in a closed space by various methods. If the vacuum pump encounters an active trip condition. 

First of all, we should understand the cause of the trip condition, and then deal with the vacuum pump trip fault, and then clean up the trip problem. The vacuum pump manufacturer explains the cause of the vacuum pump trip for you. The vacuum pump is stopped for a long time. If the vacuum pump is stopped for a long time, the motor load will lead to temporary high current. At the moment, close the air inlet of the vacuum pump to heat the pump body.

Motor load. The current of vacuum pump motor is too high at the moment. If the current exceeds the current set by the electric control box, the vacuum pump will trip and trip automatically. The vacuum pump wholesale prompts that it is the normal phenomenon of the vacuum pump at the moment. The upper limit of current maintenance can be adjusted to deal with the tripping phenomenon. The vacuum pump can be disassembled to check whether there is any internal fault.

The vacuum pump motor is connected to the two-phase power supply. If the three-phase power supply is not enabled, the three-phase power supply of the vacuum pump can be connected. If the operation time is about 10 hours and the tripping and tripping conditions occur, it is still necessary to adjust the upper limit of over-current. The above materials are supplied and shared by horsepower electromechanical manufacturers.

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double stage rotary vane vacuum pump principle

The working performance of two-stage rotary vane vacuum pump is composed of high-pressure stage and low-pressure stage. Its suction port is connected with vacuum container or vacuum equipment. During operation, a large amount of gas in the container will be inhaled and discharged. When the rotary vane vacuum pump obtains the vacuum, the exhaust valve plate of the high pressure stage will be closed, and the gas inhaled by the high pressure stage will be transferred to the second stage, which will be inhaled and discharged by the second stage, so that the vacuum equipment can obtain a certain vacuum. 

The technical parameters of the rotary vane vacuum pump are 6 × 10-2Pa. According to the user's use, the vacuum booster pump can be equipped. The rotary vane vacuum pump is used as the front stage pump. As the suction force of the booster pump is strengthened, the front stage pump is continuously removed, which can make your equipment obtain higher vacuum.

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Rotary vane vacuum pump becomes specialized pump

Nowadays, due to the professional integration of network services, many rotary vane vacuum pump enterprises have established their own brand image, expanded the influence of enterprise products, and restarted the development vitality of enterprises. In the future, the rotary vane vacuum pump is confident to achieve a perfect turn and reshape the market development vitality with the brand. 

It is designed to meet the needs of Chinese vacuum pump enterprises in the Internet era. It focuses on the brand development of the rotary vane vacuum pump industry, and integrates various core services of the rotary vane vacuum pump enterprises through the Internet technology and means.

In recent years, with the rapid development of e-commerce, many enterprises which are deeply mired in the development see a turning point of rebirth.

The rising demand caused by this phenomenon also makes domestic e-commerce websites springing up like mushrooms. Now this new network force is developing into a main communication channel connecting the supply and demand sides. Not only that, under the diversified market demand, many personalized rotary vane vacuum pump network service products have been developed one after another, acting on the development of rotary vane vacuum pump enterprises.

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Precautions for 2x rotary vane vacuum pump

(1) The vacuum degree refers to the pressure of the remaining gas in the pumped vessel. The partial pressure is the factory standard, and the total pressure is the auxiliary standard. The thermocouple measures the total pressure of all kinds of steam and permanent gas, while the Maxwell's meter can only measure the partial pressure of the permanent gas, so the values of the two meters are different.

(2) The pumping speed is calculated according to the geometric dimensions. At atmospheric pressure J, the actual pumping speed is basically consistent with the geometric pumping speed. At various pressures, the pumping speed decreases to a certain extent. The relationship between pumping speed and pressure is shown in Fig. 4.

(3) Temperature rise refers to the temperature difference between the oil at the exhaust valve and the room temperature after the pump temperature is stable.

(4) 2X rotary vane vacuum pump model: column 2k-1, 2 represents double-stage pump, K represents rotary vane vacuum pump, and the number behind a horizontal line represents pumping speed per second.

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Causes of inner wall wear of rotary vane vacuum pump

Any kind of mechanical products will wear after working for a long time. Let's discuss the causes of wear and how to reduce the wear. 

Rotary vane vacuum pump uses vacuum oil as sealing medium. Besides sealing, oil also lubricates. The deterioration of oil results in performance degradation, which easily aggravates the wear of pump wall. If the extracted gas contains water vapor, which enters into the pump cavity, the vacuum oil will be emulsified and the performance of the oil will be reduced. There is also a case that the exhaust volume is large, and it is easy to wear the inner wall. How to understand? Vacuum pump is the equipment to obtain vacuum. If the vacuum can not be obtained for a long time, the load of the pump will be large and it is easy to wear.

The phenomenon of inner wall wear is common in chemical industry. How to solve it? We can choose other more suitable models to replace, which not only ensures your benefits, but also saves you costs.

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Rotary Vane Vacuum Pump

Influence of pipeline on the performance of rotary vane vacuum pump

For users, the diameter of the suction pipe should be the same as the diameter of the pump port, and the length should be as short as possible. Too many elbows and too long pipeline will not only affect the pumping speed, but also affect the power consumption. Exhaust pipe is also the same, exhaust pipe is the most easily ignored by users, too long pipe will increase exhaust resistance, increase gas backflow, affect pumping speed, and increase power consumption. 

The oil mist eliminator of rotary vane vacuum pump developed by us, which is connected to the exhaust port of the pump, can meet the requirements of gas indoor emission. Of course, the oil mist eliminator will inevitably lose part of the power. After careful design and repeated improvement, not only the exhaust resistance is small, but also the effect is very good, and the increase of power is not obvious. It should be noted that the core of the oil mist eliminator must be replaced regularly according to the use condition.

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Maintenance of 2XZ rotary vane vacuum pump

The maintenance of 2XZ rotary vane vacuum pump is the key to maintain the safe and long-term operation of 2XZ rotary vane vacuum pump 

1. Keep the 2XZ rotary vane vacuum pump clean to prevent foreign matters from entering the pump;

2. Keep the oil level and do not run without oil;

3. Pay attention to observe the cleanness of the oil. If the pump oil becomes dirty, turbid, enters water or other volatile substances and affects the limit vacuum, the pump oil should be replaced in time. To replace the new oil, first start the pump and run for 30 minutes to make the pump oil thinner. Stop the pump and drain the oil from the oil drain hole. Then, open the air inlet to run for 1-2 minutes. During this time, a small amount of clean pump oil can be added from the air inlet to replace the oil in the pump cavity. After confirming that the pump has been cleaned several times, install the oil drain plug, and then inject clean pump oil from the oil filling hole to the oil level line;

4. When it is not used for a long time, it should be covered with suction and exhaust caps and placed in a dry place, and attention should be paid to moisture and rust prevention;

5. If it needs to be disassembled and overhauled, it must be carried out by professionals who have certain experience in repairing the pump, or contact the manufacturer.

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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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Composition of medical negative pressure system

Medical negative pressure suction system is composed of user pipe network and vacuum suction station. The user pipe network includes combination terminal and hanging tower; the vacuum suction station includes electric control cabinet, water ring vacuum pump, medical vacuum tank, sterilization filter, gas-liquid separator, sewage collection tank, etc. By vacuumizing the vacuum tank, the vacuum tank can maintain a certain negative pressure, and continuously provide suction to the user pipe network to meet the needs of users. 

The working process of medical negative pressure system: gas end point → sewage collection tank → vacuum tank → sterilizer → vacuum pump → gas water separator → waste gas evacuation, sewage liquid is collected in a centralized way and sent to sewage treatment station.

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Dust removal and filtration method of oil seal vacuum pump

Some vacuum processes will produce a lot of dust. If the dust enters the oil seal vacuum pump with the extracted gas, it will accelerate the wear of the parts in the pump cavity like abrasive, cause wear and damage to the pump rotor and pump cavity, block the oil circuit or make the pump unable to run. If the dust enters the vacuum valve, it will make the seal invalid and leak, so the dust prevention and filtering has been completed The use of dust filters in vacuum systems must be critical for increasing the lifetime of the dust system. 

When the amount of dust is small, it can be filtered by the pump oil filtering system, but when the dust amount is large, the dust collector must be used to prevent the damage of the vacuum pump and ensure the normal operation of the vacuum pump.

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Limit pressure of rotary vane vacuum pump

Soon after the rotary vane vacuum pump began to work, the minimum pressure P'g appeared. The pump continued to run, because of the increase of pump temperature, the saturated vapor pressure of pump oil increased, the viscosity decreased, and the inlet pressure slightly increased to PG. PG is the minimum stable pressure obtained by the pump and also the ultimate pressure of the pump. 

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

The amount of circulating oil also affects the limit pressure of the pump. With the increase of oil quantity, the sealing effect is better. The relationship between the limit pressure and oil quantity of rotary vane vacuum pump changes, and the saturated vapor pressure Po of oil is finally reached. In fact, the pump oil contains a lot of air and water. After the pump oil enters the pump cavity, the air and water absorbed in the pump oil are released again. The relationship between the pump limit pressure and the oil quantity develops upward. Generally, the pump oil should be kept at the specified oil level to keep the circulating oil volume of the pump constant. For the two-stage pump, the pump oil can enter the high vacuum stage only after degassing in the low vacuum stage, which can reduce the amount of bleeding of the pump oil in the high vacuum stage and reduce the limit pressure of the pump.

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Component structure of oil free vacuum system

In recent years, it has been found that the performance and technical index of many electronic devices are seriously affected by the return of oil vapor from mechanical vacuum pump and diffusion pump into the evacuated vessel or device. For example, the oxide cathode of electronic tube reduces its emission performance and service life due to oil vapor; various high-power and high-voltage electronic tubes are easy to be broken through due to the presence of oil vapor; the high-voltage vacuum capacitors used in radio stations, due to the presence of poised steam, significantly reduce their withstand voltage index, and oil vapor has a significant adverse effect in many places. Therefore, the vacuum system used in these aspects should be replaced by an oil-free vacuum system, that is, instead of using vacuum oil sealing and vacuum oil as the working fluid (such as mechanical pump and diffusion pump), the vacuum system can be obtained by adsorption of gas molecules and reducing the pressure in the container. 

The adsorption pump uses the porous surface of some solid materials to strongly adsorb the gas in the cold state, so that the closed system can obtain a low vacuum of 10-2 mm mercury column. It is used as the front stage of oil-free system.

In addition to activated carbon, most of the adsorbents used in the adsorption pump use molecular sieve (artificial zeolite) to adsorb gas and obtain vacuum. Because, after cooling with liquid nitrogen, each kilogram of molecular sieve can pump a 50-100 liter container from the atmosphere into a vacuum of 10-2 mm mercury column. Therefore, it is a pump with large suction. After baking at about 400 ℃, the gas it absorbs will be released again (called activation or regeneration) to restore the ability of reabsorbing. At present, the commonly used 5A molecular sieves (with large absorption capacity, suitable for exhaust air, but often "activated", with an average pore diameter of about 5 angstroms) and 13X molecular sieves (although their adsorption capacity is smaller than 5A molecular sieves, they can absorb oil vapor molecules).

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Influence of noise on rotary vane vacuum pump

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

In production, it is found that the exhaust port is small, the noise is small, and vice versa. This shows that the size of the exhaust port has a great impact on the noise. Nanguang machine factory has a unique research in this field.

When starting at atmospheric pressure, the pressure is high and the amount of gas is large. High and low vacuum chambers are selected to exhaust together, and most of the gas is discharged from the exhaust valve of the high vacuum chamber. Because the size of the exhaust port of the high vacuum chamber has no effect on the noise, and can reduce the exhaust pressure, the tightening work and the starting power, the area of the exhaust port of the high vacuum chamber should be larger. In normal operation, the exhaust valve of high vacuum chamber is closed, and the primary factor affecting noise is exhaust valve of low vacuum chamber. Therefore, the exhaust port area of the low vacuum chamber should be smaller to reduce the noise, but if the exhaust port is too small, the exhaust pressure will increase and the power consumption will increase.

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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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Application of water jet pump

It is used in vacuum distillation, concentration, dehydration, decolorization, dryness, crystallization, filtration, degassing, material transportation, tail gas and dust absorption, etc. 

It is used for secondary steam eruption and condensation. In some process, many secondary steam will need to be condensed. At the same time, a small amount of non condensable gas also needs to be discharged to maintain normal production. This kind of water eruption pump is also called water eruption condenser, which takes condensation as the main and exhaust as auxiliary.

It is used in vapor-liquid mass transfer and absorption. The liquid flowing out at high speed meets the ejected gas. The process of gas flow trapped by jet is also the process of vapor-liquid two-phase mixing. Because the gas-liquid two-phase of the water jet pump has a large touch surface, and the high-speed jet has a great speed, which greatly strengthens the speed of the mass communication process in the absorption and mass transfer, and accelerates the chemical reaction or material transfer process. Therefore, the water jet pump has the effect of both the reactor and the pump

In many large chemical plants and chemical fertilizer plants, steam or hot water with certain energy is often discharged to form power waste. Water jet pump is used to eject low-energy fluid with few jars of high-energy fluid, so as to increase the energy of the fluid and then use it in the production process.

The high-energy fluid, which is used in the transfer of fluid power, ejects the low-energy fluid participating in the reaction to replace the power equipment for transporting the fluid.

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Causes of scale formation in vacuum pump

In the papermaking profession, the working medium of vacuum pump (i.e. make-up fluid) is to directly quote tap water or papermaking white water. Because the hardness of tap water is relatively high, the metal ion composition in white water is also relatively disordered. Therefore, the internal fluid components of vacuum pump work in this medium condition, through a long time of physical and chemical process, will form scale. 

After scaling, the pumping rate of vacuum pump will decrease. Figure 1 is the working condition diagram of vacuum pump internal flow passage parts after scaling. Because there is scale between the impeller blades and on the inlet and outlet windows, the volume of the sealing chamber is significantly reduced, and the volume of the inlet and outlet body is naturally reduced. When the scale almost fills the space between the blades or the air intake and exhaust windows are almost full of scale, the intake and exhaust volume is almost zero, and the vacuum pump loses the effect of vacuum pumping.

After scaling, the vacuum pump not only decreases the pumping rate, but also increases the power consumption. Because of the formation of scale, the exhaust window is reduced, and the contraction ratio of the gas in the chamber increases when the window is discharged, and then the power consumption increases, and the power consumption travels about 10%.

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Development trend of vacuum pump

With the continuous increase of environmental protection, some enterprises or manufacturers of water ring vacuum pump were forced to stop using this type of vacuum pump due to many sewage discharge. It is necessary to choose oil-free vacuum pump or closed circulation system and large-scale oil-free vacuum unit instead, such as vertical oil-free reciprocating pump and oil-free rotary vane pump, oil-free vertical vacuum pump and oil-free vacuum pump with vacuum High degree, fast pumping speed, no pollution benefits. Because there is no sewage discharge, so the oil-free vertical vacuum pump is especially suitable for chemical, pharmaceutical and food industries, especially in clean high vacuum or gas recovery environment. 

The application scale of oil-free vacuum pump is more extensive, which is used in the absorption and transportation of various goods, and the material supply equipment of active machinery. The planning of closed cycle system is to recycle the discharged polluted liquid, which greatly reduces the damage to the environment; the second is to recover the usable medium and reduce the cost of production.

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Maintenance of fixed plate mechanical vacuum pump

The structure of fixed plate mechanical vacuum pump is all combined, similar to small five pieces. The exhaust valve is of the bullet type. If it is used for a long time, the bullet will also fly off, resulting in the failure of no air extraction; some pumps have manufacturing problems, the vent hole is too oblique, the bullet can not return to its original position after being lifted by the air flow, and the valve port can not be blocked, so the vacuum degree is not high. When repairing, the air outlet can be reamed into the inlay sleeve to correct the air outlet, so as to overcome the above problems. 

After several years of service, the vacuum degree of the fixed plate vacuum pump becomes worse due to wear and tear. At this time, the pieces can be disassembled and grinded against each other. After being cleaned, they can be assembled. At this time, if the tolerance between the rotor and the end face is too small, some end faces can be ground and installed again. The stator is tightened by the spring to keep it close to the rotor forever to prevent the reverse "breakthrough" of gas. Therefore, the spring has a large expansion frequency and is easy to break. If one of the two springs is broken, the pulsating sound of the exhaust valve is paroxysmal, and the fuel tank cap can be disassembled for inspection.

In winter, the viscosity of the oil sometimes becomes very large, after stopping the pump, the air is not put into the pump cavity in time, causing the oil to fill the pump cavity. When the pump is started suddenly, the oil in the cavity is difficult to be squeezed out at once. The stator is often squeezed out of the stator groove or the rotor is broken (or even the rotor is cracked), so it is impossible to pump air. When repairing, only the fixed piece is out of the way. The end of the fixed piece can be gently knocked with a wooden strip to make it return to its original position, and the belt pulley is turned on manually. After the pump oil in the cavity is discharged, the pump can be started for air extraction. If the rotor is damaged, it should be replaced with a new one. Therefore, the fixed vane pump start and normal use must comply with certain regulations, should also stipulate the oil change system on schedule.

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The function of gas ballast valve in rotary vane vacuum pump

The gas ballast valve is set in rotary vane vacuum pump to remove condensable gas. Usually, the pumped gas is a mixture of permanent gas and condensable gas. In the process of compression and exhaust, when the partial pressure of condensable gas exceeds the saturated vapor pressure corresponding to the pump temperature, the condensable gas will condense and mix in the pump oil, circulate with the pump oil, and evaporate again into steam when returning to the high vacuum side. This will affect the pumping performance of the pump and aggravate the pollution degree of the pump oil. The method of gas stabilization or aeration can effectively prevent the condensation of condensable gas, that is, the controlled permanent gas (usually dry air at room temperature) is mixed into the compressed gas through the gas ballast hole in the compression process, so that the partial pressure of the condensable gas does not reach the saturated vapor pressure corresponding to the pump temperature, the pressure of the compressed gas has reached the exhaust pressure, the exhaust valve is opened, and the condensable gas The body is discharged with the permanent gas. Oil sealed mechanical vacuum pump is generally equipped with air ballast device, so it is also called air ballast pump. The air ballast valve (aerator) consists of throttle valve and check valve. 

The throttle valve controls the volume of air mixing, and the check valve prevents backflow when the gas pressure in the pump chamber is higher than the aerated pressure. There are generally two kinds of setting of air ballast hole: one is near the pump exhaust port, when the compression chamber and the exhaust port are connected, start to aerate; the other is set on the end cover, when the end of suction, when the rotor turns another angle (100 ~ 150), it will expose the air ballast hole and start to aerate. In the process of aeration, the limit pressure of the pump will rise and the pumping rate will decrease. When the pressure is low, the noise caused by the pump oil impacting the exhaust valve can be reduced by properly opening the air ballast valve and mixing a small amount of gas.

The pump can be pumped out at high speed (90 ℃). In order to prevent oil injection and oil return, improve the lubrication conditions of the pump and expand the application range of the pump, the vane pump is also equipped with various accessories, such as oil mist catcher, molecular filter, dust filter, chemical filter, oil filter, etc. With the progress of technology and the improvement of process requirements, the structure of vane pump is becoming more perfect and its performance is constantly improved.


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