Energy saving device of rotary vane vacuum pump

The energy-saving control device of rotary vane vacuum pump includes rotary vane vacuum pump and asynchronous motor driven and connected with it, rotary vane vacuum pump connected with sealed container which needs vacuum pumping, vacuum measuring instrument, control device and AC voltage regulating device. The air pressure sensor connected to the vacuum measuring instrument is located in a sealed container, the electrical signal output end of the vacuum measuring instrument is connected with the control device, the control terminal of the control device is connected with the AC voltage regulating device connected with the power grid, and the output end of the AC voltage regulating device is connected with the asynchronous motor.

The vacuum measuring instrument receives the gas pressure signal in the sealed container transmitted by the pressure sensor, and sends it to the control device through transmission and amplification. The control device stores a program to adjust the voltage according to the gas pressure signal, and compares the received gas pressure signal with the set value. When the gas pressure of the extracted container is lower than the set value, it will send a step-down command to the AC pressure regulating device. According to the command of the control device, the AC voltage regulator supplies the voltage to the asynchronous motor when the gas pressure decreases, so as to reduce the energy consumption. The vacuum measuring instrument is equipped with a gas pressure indicator, which can display the current gas pressure in the sealed container.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Development of rotary vane vacuum pump

Because of its unique working principle and irreplaceable functional characteristics, vacuum pump has a very wide range of applications in the field of engineering industry. In the fields of precision electronics, engineering machinery, chemical agriculture and other industries, different types and specifications of vacuum pumps play an important role in improving the efficiency and efficiency of economic production. Among various types of vacuum pumps, rotary vane vacuum pump is the most widely used in the industrial field. It is one of the most important types of vacuum pumps, and also the most rapid development of functional structure of vacuum pumps.

With the continuous progress of the technological performance of rotary vane vacuum pump, industrial robots, microelectronics, computers, intelligent and image sensing technology are widely used in the pump production system. In the future market, the R & D and manufacturing of rotary vane vacuum pump will develop in the direction of high speed, multi-function and intelligent control. Automation and integration will become the future rotary vane vacuum pump Exhibition direction.

In order to meet the market demand, domestic enterprises in vacuum pump equipment industry should pay more attention to the integration and automation of vacuum pump production. In the production of vacuum pump equipment, we should pay attention to the function switching design of rotary vane vacuum pump equipment, improve the integrated function of rotary vane vacuum pump, and make it have better functional applicability.


Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Material of rotary vane vacuum pump

Data selection of rotary vane vacuum pump: in order to improve the pump speed, reduce wear and temperature, and ensure the normal performance of the pump, one of the key is how to properly select the stator and vane, which is the main friction pair data. Carbon impregnated alloy, a new type of self smoothing data, is commonly used in the rotary vane of direct coupled pump. Some domestic research institutes have also made comprehensive tests on other materials used as spin sheets. The results show that carbon fiber reinforced plastics and polymer liquid crystal data are of development value.

As the friction and wear between the vane and the stator of the high-speed direct coupled pump increases, the temperature rise of the pump increases. Therefore, improving the friction, wear and smoothness between the vane and the pump cavity is the key to develop a good performance direct coupled vane pump. Through the analysis and calculation of Elastohydrodynamic smoothing theory, it is found that the motion between the vane and the pump cavity is unreasonable, which makes the wear between the vane and the rotor and the pump chamber more serious, and it is difficult to find a suitable smooth condition, which leads to the increase of temperature rise of high-speed vane pump. The way to deal with the wear is to keep the length unchanged during the rotation. However, the current round pump cavity is impossible to do. In theory, an envelope line of stator pump cavity can be proposed, which is tangent to the outside of envelope circle on a series of axisymmetric curves. Of course, the processing technology of this kind of profile is more laborious than that of circular profile, but the extra cost can be compensated from the improvement of pump performance. Such a pump, vibration, noise, temperature rise, wear will be reduced a lot.

Rotor structure and rotor: through the calculation of the geometric pumping speed of the vane pump, it can be seen that when the pump speed has reached a certain high value, increasing the rotor can improve the pumping speed without increasing the rotor eccentricity and the maximum linear speed. Therefore, it is a promising way to improve pumping speed.

At present, the direct coupled pump used by domestic manufacturers adopts the structure of three slot integral rotor, which is equipped with three rotors. The integral rotor with three blades has high strength and rigidity, which can reduce the unbalance of rotor at high speed and reduce the impact load of rotor. The geometric pumping speed calculation shows that the pumping speed of the three slot rotor is 18-20% higher than that of the two slot rotor.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Skill of vacuum pump oil filtration and replacement

After the dust, impurities and contaminated oil sink into the bottom of the main oil tank, they flow into the auxiliary oil tank through the oil return pipe. After separation and precipitation, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the discharge valve. The relatively clean oil is filtered by the filter in the upper part of the auxiliary oil tank, and then enters the oil separation chamber through the oil inlet pipe, and then supplies to the end cover and pump chamber.

During the use of vacuum pump oil, due to oxidation, emulsification and various impurities mixed into the outside, some of the oil is deteriorated. When the metamorphic components and impurities reach a certain degree, the color of the oil changes, the viscosity and acid value increase, and insoluble resin like substances are precipitated, which results in the increase of vapor pressure and deterioration of performance of vacuum pump oil. At this time, the pump oil can no longer be used, and a new pump oil must be replaced.

In order to prevent the dust and particulate matter in vacuum pump oil from entering the pump cavity along with the pump oil, continuous filtering device should be set up during the operation of the pump for some technological processes. After the dust, impurities and contaminated oil sink into the bottom of the main oil tank, they flow into the auxiliary oil tank through the oil return pipe. After separation and precipitation, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the discharge valve. The relatively clean oil is filtered by the filter in the upper part of the auxiliary oil tank, and then enters the oil separation chamber through the oil inlet pipe, and then supplies to the end cover and pump chamber.

The filter element in the filter blocks the mechanical pollutants when the oil passes by and purifies the vacuum pump oil. The pressure gauge is often connected to the filter to show whether the filter is blocked. When the pressure increases, the oil cannot flow normally. The filter element should be cleaned or replaced.

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vacuum pump in gas drainage

Gas accident is the most important thing in coal mining industry in recent years. Dozens of innocent people can be killed in a mine accident. Therefore, the safety of equipment in coal mining industry can not be ignored. There are several basic forms of gas drainage by water ring vacuum pump / compressor

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

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


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Special vacuum pump for vacuum packaging machine

The main function of vacuum packaging (vacuum packaging) is to prevent spoilage by vacuum packaging, and the main purpose of vacuum packaging is to prevent spoilage of microorganisms, such as vacuum packaging It is to use this principle to take out the oxygen in the packaging bag and food cells, so that microorganisms lose their living environment. The experiment shows that when the oxygen concentration in the bag is less than or equal to 1%, the growth and reproduction speed of microorganisms will drop sharply. When the oxygen concentration is less than 0.5%, most microorganisms will be inhibited and stop breeding. (Note: vacuum packaging can not inhibit the reproduction of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reaction, so it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt pickling, etc.)

In the process of vacuum packaging, the general needs of vacuum pump are rotary vane vacuum pump, roots rotary vane vacuum unit, according to the required vacuum degree, the vacuum pump needs to be selected is not the same, can be equipped with the appropriate vacuum pump according to customer needs, if you have questions about vacuum packaging machine special vacuum pump, you can contact us at any time!

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Characteristics of water ring vacuum pump

Water ring vacuum pump can transport both gas and liquid. It is only in the pumping liquid, the aging rate is low. When conveying gas, it can also be used as a low-pressure compressor, and its discharge pressure is about 0.1-0.2 MPa. The range of displacement is 0.25-30 m3 / min. The vacuum degree can reach 70-80%, while the vacuum degree can reach 99.5% when the manufacturing is excellent.

When the extracted gas should not contact with water, the pump can be filled with oil or other liquid medium (at this time, it is often called liquid ring pump). If oil is used as working medium, the vacuum degree of the first stage and the second stage can reach 99.98% and 99.999% respectively.

The biggest advantage of water ring vacuum pump is that it can pump gas containing liquid. In the use of the vacuum system, there are many conditions in which the inhalation contains liquid in the form of clouds. Even if it contains Yanqi state, it will liquefy in the compression process, and it is not suitable to use general reciprocating pump for such suction. Because the liquid is enclosed between the piston and the cylinder head, the valve and other channels become too narrow due to the existence of liquid. The gas resistance increases, that is, the success rate is lost. And the water ring vacuum pump is originally liquid as the piston, so in the suction containing liquid is completely OK.

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

industrial vacuum pumps,vacuum furnaces

Precautions for shutdown of stainless steel vacuum pump

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

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

2. Stop the motor;

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

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

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


Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

industrial vacuum pumps,vacuum furnaces

Structure characteristics of roots rotary vacuum unit

Roots vane vacuum unit can be used in various vacuum systems which need large pumping speed and low and high vacuum, which is closely related to its mechanism characteristics.

1、 An oil mist eliminator is installed inside the pump, which can effectively eliminate the oil mist in the gas discharged by the pump and avoid the pollution of the oil mist to the surrounding environment.

2、 The suction port of roots rotary vane vacuum unit is equipped with a check valve. When the pump stops, the check valve and the specially arranged hole in the pump can immediately isolate the pump from the pumped system, prevent the pump oil from returning to the pumped system, and maintain the vacuum degree of the pumped container at the same time. Therefore, this type of vacuum pump unit can not be equipped with a vacuum stop valve with air release It can reduce the user's use cost.

3、 The pump is equipped with an oil-gas separator, which, together with an oil mist eliminator, forms an effective noise elimination system, which can eliminate exhaust noise and avoid noise pollution.

4、 The pump and the motor are directly connected and installed, air-cooled and water-cooled pipes are not required, so this type of equipment is compact in structure and easy to install.

5、 The structure design of roots rotary vane vacuum unit is reasonable, the vibration is small, and it can work without anchor bolt.

The mechanism characteristics of roots rotary vane vacuum unit make it have the characteristics of high vacuum degree and wide range of pumping speed in use, which can greatly improve the working efficiency in many industries.

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Dry Type Oilless Vacuum Pumps

Cleaning method of water ring vacuum pump

After using the water ring vacuum pump for a long time, it is inevitable that the pump body will be contaminated with some dust and other impurities. If these impurities enter into the pump, it will seriously affect the service performance of the water ring pump. Therefore, the user needs to clean the pump regularly. The water ring vacuum pump manufacturer introduces the following cleaning methods for us.

1. Clean the rolling bearing of water ring vacuum pump with gasoline, and wait for it to dry or blow dry after cleaning.

2. Clean the pump parts with anhydrous kerosene, and then wipe them with cotton cloth to ensure that there is no cotton fiber left on the parts.

3. Place diluted nitric acid or other soluble substances in the container and wait for about one hour, and then wash them with clear water directly. If there is pressure, the effect will be better.

The long-term use of water ring vacuum pump is inseparable from its regular cleaning and maintenance. Its cleaning operation includes not only external cleaning, but also internal cleaning. If the residual substances in the parts are not cleaned in time, they will mix into the newly changed lubricating oil, which will affect the oil quality and lubrication effect. Therefore, the user should pay attention to the cleaning operation of the pump.

SSR Roots Type Blowers

industrial vacuum pumps,vacuum furnaces

Dry Screw Vacuum Pump

Introduction of heat dissipation mode of water ring vacuum pump

When the water ring vacuum pump draws vacuum in the fields of petroleum, chemical industry, medicine and so on, due to the high working pressure, it will produce certain heat. If the heat can't be dissipated in time, it will affect or even damage the internal parts of the pump for a long time. At this time, we will take an effective way to dissipate heat, which is determined according to the heat of different parts of the pump body Now, the water ring vacuum pump manufacturer will introduce it to us!

1. Add lubricating oil: since the working vacuum of water ring vacuum pump is not very high, generally, 46 mechanical oil can be used to replace the vacuum pump oil. Generally speaking, before start-up, the oil level in the oil window at both ends of the pump shall not be less than 2 / 3 of the height of the oil window, and shall not be less than 1 / 2 of the height during operation.

2. Use of the unit composed of the front-end pump: the main pump of the unit is water ring vacuum pump, and other mechanical vacuum pumps such as liquid ring vacuum pump, rotary vane vacuum pump and slide valve vacuum pump are the front-end pumps. The automatic operation, automatic overheating and overload protection of the unit are achieved through various vacuum instruments and control equipment. According to different process requirements and different configuration of the front stage pump, the pump can be composed of one or more pumps and the front stage pump.

Heat dissipation is conducive to slowing down the use pressure of the water ring vacuum pump, prolonging the service life of the pump and improving the working efficiency of the pump. Therefore, when using the water ring vacuum pump, we should choose the appropriate heat dissipation mode to ensure that the pump can be used for a long time.

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Troubleshooting of vacuum degree of imported vacuum pump

Vacuum degree indicates the thinness of gas in vacuum state. It is usually expressed in terms of absolute pressure and relative pressure. If the pressure in the measured equipment is lower than atmospheric pressure, a vacuum gauge is required for pressure measurement. The value read from the vacuum gauge is called vacuum degree.

The reason for the vacuum failure of the imported vacuum pump is not the only one, and our detection method is very single. The whole system has only one vacuum meter, which can only reflect the final pumping result of the system, but not the process quantity of each unit at a certain time, which brings a lot of inconvenience to the troubleshooting and increases the troubleshooting time.


At present, the troubleshooting method is basically elimination method, and the steps are as follows:

1. Determine the accuracy of the vacuum degree instrument of the imported vacuum pump;

2. Ensure that the system shut-off valve is free of leakage;

3. If the fault is the manifestation of phenomenon I, it is necessary to check the external leakage of the whole system;

4. If the fault is the manifestation of phenomenon II, first check whether the parameters of steam, water and other energy media are abnormal. If not, check each check valve. If not, conduct system performance test to determine which stage of pump has performance problems, and check the nozzle and steam valve of the pump.

industrial vacuum pumps,vacuum furnaces

Dry Screw Vacuum Pump

SSR Roots Type Blowers

How to prevent scaling of vacuum pump

Vacuum pump in use for a period of time will scale, these dirt will affect the normal use of vacuum pump, then, how to prevent vacuum pump scaling?

1. Hardness of circulating cooling water

The operation process of circulating water in vacuum pump is very similar to that of boiler water in low pressure hot water boiler. Therefore, to manage the water quality of vacuum pump according to the water quality standard of hot water boiler can not only prevent the scaling of vacuum pump, but also prevent the corrosion of vacuum pump.

Most of the circulating water systems of vacuum pump are open circulation systems with high return rate. In the case of not using ion exchange equipment for water treatment due to capital and other reasons, a softened water tank and a high water tank are generally used to supply water to the vacuum pump.

2. Temperature control of circulating cooling water

From the above analysis, it can be seen that the difference between the water ring temperature in the vacuum pump and the water temperature in the softened water tank is an important factor leading to scaling. Therefore, increasing the circulating water supply and improving the cooling effect is an important guarantee to minimize the scaling rate.

Therefore, in the process of circulating cooling water operation, it is necessary to monitor the return water temperature and return water volume of each pump to ensure that the normal water supply and return water temperature of each pump do not exceed 40 ℃. The water supply can be controlled by valves. If the return water temperature exceeds the requirements, it is necessary to supplement low-temperature cold water or use other cooling methods to reduce the temperature of the softened water in the softened water pool.

3. Wash the pump body regularly

The pump body drain gate valve of the water ring vacuum pump can not only discharge the accumulated water in the pump normally, but also wash the dirt and water slag in the pump regularly by using the water pressure of the pump body during the operation. On the one hand, it can prevent the dirt from accumulating, on the other hand, it can prevent the water slag from transforming into the scale.

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Cooling mode of heat dissipation of roots water ring vacuum unit

Cooling mode of heat dissipation of roots water ring vacuum unit

When the roots water ring vacuum unit carries out energy conversion, there is always a small part of loss converted into heat. It must continuously dissipate the heat through the motor shell and surrounding medium. This process of heat emission is called cooling. There are four commonly used methods:

1. Internal cooling of the rotor. In order to make the roots water ring vacuum unit work under higher pressure difference, a more effective cooling method can be adopted, that is, the rotor is cooled by circulating oil, and the two ends of the vacuum unit shaft are respectively provided with oil holes and oil diameter shaft heads, which are driven through the inner wall of the rotor and then discharged from the other end.

2. Air cooling. That is to say, the air inhaled by the interstage or two-stage pump is compressed and transmitted through the combined muffler with comprehensive absorption and phase difference.

3. Cool down. The roots water ring vacuum unit generates heat due to the transportation and compression of gas, which must be transmitted from the rotor to the shell.

4. The oil film of the rotor is cooled. The cooling method is to connect an oil pipe at the inlet of roots water ring vacuum unit, and take the heat of the rotor away with the evenly dripping cooling oil.

When the temperature of roots water ring vacuum unit is too high, different cooling methods can be adopted to avoid loss

Water Ring Vacuum Pump manufacturers

What is water ring vacuum pump

Liquid Ring Vacuum compressor

How to disassemble liquid ring vacuum pump

Liquid ring vacuum pump can be divided into single stage and double stage, and the difference between single effect and double effect. The single-stage and double-stage vacuum pumps refer to the stages of their impellers; the single / double effect refers to the way of their impellers / casings. The impellers of the single effect impeller vacuum pump rotate once and experience one suction / discharge of gas; the impellers of the double effect vacuum pump rotate once and experience two suction and discharge of gas.

All parts of the liquid ring vacuum pump shall be completely cleaned in the process of repair. The specific steps of disassembly and assembly are as follows: unscrew and remove the screws, and remove the diaphragm of the liquid ring vacuum pump cover and O-ring assembly along the axial direction. Generally, it is not necessary to remove the diaphragm from the pump cover, but if it is necessary to replace the diaphragm, clean or replace the valve plate, or if the cavitation maintenance pipe and O-ring are dropped, the diaphragm shall be removed from the pump cover.

When the diaphragm is disassembled from the pump cover, it can be pierced into a Φ 12M, l = 140mm round rod from the emptying port of the liquid ring vacuum pump cover. After the diaphragm is removed, the valve plate baffle, valve plate and cavitation maintenance pipe can be removed from the disc. Unscrew the bolts and remove the pump cover, diaphragm and O-ring together.

Screw out the screw, take out the impeller pressing plate and adjusting washer, pull out the impeller through pulling force, and remove the flat key from the main shaft. Remove the mechanical seal. In order to remove the mechanical seal more simply, the motor shaft before the mechanical seal can be coated with water and smooth (rubber bellows seal prevents oil or grease from being smooth). If there are calcifications such as scale on the electric shaft, the mechanical seal shall be removed after it is cleaned, otherwise the mechanical seal will be damaged simply.

What Is Dry Rotary Vacuum Pump

Alibaba Vacuum Pump

Dry Screw Vacuum Pump For PVC Plastic Profile Production Line 

Under what conditions should vacuum pump be used best

Under what conditions should vacuum pump be used best?

Many users don't understand the use conditions of vacuum pump, which often causes the damage of vacuum pump, so under what conditions is the best use of vacuum pump? According to the basic needs of users and their own experience, the technicians of vacuum pump factory summarized the following points, hoping to help you.

(1) The selection of vacuum pump should be based on the user's specific process, such as the vacuum degree, the pumping rate, the selection of power supply voltage, etc.

(2) The vacuum pump should be cleaned and changed regularly. Especially for the rotary vane vacuum pump, kerosene or straight run gasoline shall be used for cleaning. After cleaning, all parts shall be dried, air dried or blown with a blower. When changing oil, 100 × or 1 × clean vacuum pump oil shall be selected. If other oil is used instead, the vacuum degree will be seriously affected, the vacuum pump shall be placed in a clean and dry place.

(3) The connection pipeline between vacuum pump and user system shall be mainly short and thick, and elbows shall be minimized. If there are elbows, all joints shall be strictly sealed to ensure no air leakage.

(4) The temperature of the gas pumped by the vacuum pump is also limited. If the temperature of the gas pumped by the water ring vacuum pump is higher than 40 ℃, a gas cooling device shall be added. If there is liquid drop, condensation dehumidification device shall be added. If the pumped gas has corrosiveness or chemical reaction with oil, the material of vacuum pump shall be selected.

(5) Before starting the pump, check whether the rotation direction of the motor is correct (when checking the direction, take off the drive belt first to avoid oil gushing out when the motor reverses). The inspection methods of the rotary vane vacuum pump and the water ring vacuum pump are different, and check whether the lubrication system is reliable and the oil quantity is appropriate.

（6） The oil temperature of vacuum pump in operation shall not exceed 75 ℃, and there shall not be too much noise and vibration, otherwise it shall be shut down for maintenance.

(7) When stopping the pump, the valve connecting the vacuum system shall be closed first, and the vent valve shall be opened to prevent the pump oil from being sucked back into the vacuum system, and then the power supply of the motor shall be cut off.

To sum up, the service life of the vacuum pump is not only related to the quality of the vacuum pump itself, but also requires the user to use it in strict accordance with the requirements of our factory. It is not allowed to dismantle or operate the pump without permission under unclear conditions.

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Leakage rate detection of water ring vacuum pump

Leakage rate detection of water ring vacuum pump

With the development of society, vacuum pump has been widely used, especially water ring vacuum pump is a typical vacuum pump. In order to use it better, we often need to detect the leakage rate, which is mainly divided into internal leakage and external leakage detection. The internal leakage is more complex. Let's have a detailed understanding.

1. The internal leakage of water ring vacuum pump mostly occurs on the equipment with water-cooled jacket. No doubt was found through checking the external leakage, but there are the following phenomena: the pumping speed of mechanical pump is obviously low, the indicated value of vacuum gauge is low, the mechanical pump oil is quickly emulsified, and the iron-based parts in vacuum chamber are obviously rusted. If the above conditions are met, internal leakage can be basically determined. Clean the inner wall first, and then pass cooling water to see if there is any wet point. The wet point is the leakage point.

2. Small leakage and micro leakage are difficult to check. The commonly used method is to use the ionization tube sensitive to some gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to the suspicious place. When it is sprayed to the leakage point, the pointer of the ionization meter will swing obviously. In this way, we must be patient, wait until the indicator value of the ionization meter is stable, that is, the pumping capacity and leakage rate of the water ring vacuum pump are balanced, and then spray again, try to repeat several times to confirm the leakage point.

3. For larger leakage point, flame method can be used. Based on the principle that air flow can make the flame deviate, vacuum first. For example, use candle or lighter to gradually search around the suspicious point, and it will be found that the flame deviates to the leakage point, then the leakage point can be found.

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high vacuum adsorption pump application

high vacuum adsorption pump application

The physical adsorption or absorption of gas by common surface or porous materials can be used to obtain high vacuum. Adsorption or absorption technology can be used at any pressure, but due to practical limitations, it is only developed as a special application in vacuum technology.

In order to eliminate the possibility of hydrocarbon pollution caused by oil sealed mechanical pumps, adsorption pumps are often used for crude pumping in ultra-high vacuum system, and are often used with dry (oil-free) mechanical pumps. Two or three adsorption pumps can be used in turn according to the pumping procedure, which can discharge a large amount of air from the vacuum vessel. By switching to ion getter pumping, a sufficiently low pressure can be obtained without overloading it.

High vacuum can be obtained by adsorption, which can be achieved by desorbing the adsorbed gas material through heating, then returning to room temperature, or cooling to low temperature.

Commercial adsorption pumps are usually designed to obtain a pre vacuum. However, high vacuum can also be obtained by multistage pumping with similar basic structure, but a high inlet flow guide is required.

Hermetically sealed devices are usually vented and sealed at elevated temperatures. During the cooling period, the number of adsorption sites is large enough to provide a significant pressure reduction of air extraction, thus reducing the pressure by one or more orders of magnitude. Numerous examples show that when there is a large temperature change, there must be adsorption effect in the high real air. For example, when the heating element of the high vacuum furnace is still hot, isolate the vacuum guard from the pump and cut off the power supply. As long as the vacuum furnace is well sealed and the residual gas can be fully absorbed, the high vacuum of the vacuum furnace will be maintained overnight.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

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Disassembly and assembly of water ring vacuum pump

Disassembly and assembly of water ring vacuum pump

1. Before disassembly, drain the water in the pump body, and remove the separator and connecting pipe. The order of pump removal from the rear end (one end without coupling) is as follows:

(1) remove the bearing housing cover, remove the pressure washer, loosen the bearing housing nut and remove the bearing housing.

(2) remove the bearing frame, loosen the gland nut and remove the gland.

(3) loosen the tension bolt and remove the rear end cover after the foundation bolt of the pump cover is loosened.

(4) remove the pump body.

(5) remove the coupling and flat key, loosen and remove the front bearing gland.

(6) take out the pump shaft and impeller together from the front end cover, and loosen the front bearing frame.

2. Assembly

Clean all mating surfaces, apply new oil to the bearing after cleaning, and apply new oil to the bearing seat. The assembly sequence is the reverse of disassembly. At this time, adjust the position of the impeller in the pump body

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Pipeline design of water ring vacuum pump

Pipeline design of water ring vacuum pump

Before using the water ring vacuum pump unit, it is necessary to design the pipeline route, because the pipeline is the main device to send and pump flammable and explosive gas. Once the pipeline route is unreasonable, it will easily lead to various troubles. Therefore, it is necessary to design a reasonable pipeline route, which is conducive to the work efficiency and stability of the unit in the later stage. So how to design a reasonable pipeline? Xiaobian will provide you with several methods.

1. The shorter the interval between the fragmentary outlet of the water ring vacuum pump unit and the inlet of the pump, the better.

2. The less the pipeline turns, the better.

3. The outlet pipe shall be higher than the inlet line of the pump, and the outlet pipe shall be prevented from factors that cause greater resistance, such as climbing up the outlet pipe, right angle turning, etc.

4. The diameter of the matching inlet and outlet pipe should be different from that of the commodity. For example, if the vacuum is small, the receiving diameter of the matching inlet and outlet pipe can be small, but not less than 70% of the commodity inlet and outlet diameter, and the outlet diameter should be greater than or equal to the inlet pipe diameter.

5. The corner of the pipeline shall be smooth.

6. The water inlet pipeline of vacuum pump unit shall be equipped with valves to regulate the amount of water inlet, which has an impact on the vacuum degree. When regulating the amount of water inlet, the valve shall be controlled by checking the pointer of the vacuum gauge.

Therefore, in order to ensure the normal operation of the water ring vacuum pump unit, it is necessary to achieve the correct installation, operation specifications, maintenance, etc., and all these premises are to ensure that the design of the equipment is reasonable first, otherwise the unreasonable equipment, no matter how it is operated, will not be correct, so whether it is the equipment or anything, it is necessary to lay the foundation premise first, and then carry out the next operation.
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