Precautions for purchasing oil-free vacuum pump

Now technology drives the innovation of products, and the performance of oil-free vacuum pump products has been greatly improved, which is loved by many industries. However, when purchasing oil-free vacuum pump, we can not choose manufacturers at will. What should we pay attention to when purchasing oil-free vacuum pump? 

Generally, the limit vacuum degree of the pump is 0.5 to 1 order of magnitude higher than that of the vacuum equipment. Correctly select the operating point of oil-free vacuum pump. Each type of pump has a fixed operating pressure range, such as: 2BV series oil-free vacuum pump operating pressure range of 760mmhg ~ 25mmhg (absolute pressure). In such a wide pressure range, the pumping speed of the pump varies with the pressure (refer to the function curve of the pump for detailed changes), and its stable working pressure range is

Therefore, the operating point of the pump should be selected in this range rather than long-term operation under 25 ~ 30mmhg. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small air extraction capacity, but it is small in size, simple in installation, simple in maintenance, easy to move, does not pollute the environment, does not produce lampblack, especially in the laboratory with higher request. It is also one of the equipment in the laboratory.

Therefore, when purchasing the oil-free vacuum pump, the vacuum degree of the request should be confirmed first. If the demand is high, the vacuum pump selected should be higher than the vacuum degree required, otherwise, the vacuum pump can not reach the request of vacuum pumping, and the work request will not be reached. The other is the pumping rate of oil-free vacuum pump, which is slightly higher than the required pumping rate, so as to better meet the demand. Finally, we can see whether the extracted gas is corrosive or not. If the corrosive gas is corrosive, it is necessary to use special materials to meet the demand.

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How to install liquid ring vacuum pump coupling

Liquid ring vacuum pump coupling is a kind of installation which connects the driving shaft and the driven shaft together. It is composed of motor coupling and liquid ring vacuum pump coupling. 

In the installation, the motor coupling and liquid ring vacuum pump coupling must be concentric, and there must be a certain and equal axial clearance between the two ends, otherwise the operation and service life of the liquid ring vacuum pump will be seriously affected. Therefore, the correct coupling device is an important part of the assembly work.

The axis of liquid ring vacuum pump shaft and motor shaft should be on the same continuous line. If there is a certain inclination (i.e. the so-called different axial degrees), the liquid ring vacuum pump will run unsteadily, and produce vibration and noise, which will cause bearing wear and affect the service life. Therefore, when installing motor coupling and liquid ring vacuum pump coupling, there should be different axial requirements. 

Because the outer circle dimensions of motor coupling and liquid ring vacuum pump coupling are equal, different axial degrees can be checked through the outer circle. The inspection method is to place a ruler on the outer circle of the motor coupling and the liquid ring vacuum pump coupling, and check whether the straight edge can all adhere to the outer circle. If it is closely attached to one coupling and there is a gap with the other coupling, it is clarified that the two couplings are not concentric and need to be adjusted. In this way, check the motor coupling and liquid ring vacuum pump coupling at the four positions up and down, until they are very close and there is no gap.


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Roots Vacuum Pump

Matters needing attention in the installation of vacuum system

After the design and selection of the vacuum system equipment, it finally entered the installation stage. Although there are layers of leak detection and other work checks, but still need to do some preparatory work and precautions in this link 

Before the installation of vacuum pump and vacuum system, all kinds of parts should be cleaned to remove the impurities such as oil, dirt, welding flux, etc. during the processing and storage of the parts, so as to prevent the formation of air source inside the vacuum system after the installation. The common method is to use decontamination powder and wash with hot water, and finally blow dry with hot air and wipe with organic solvent.

The second is the leak detection of parts before the device. In front of the device, the leakage of the local parts of the vacuum pump and the air system shall be checked, and the parts with leakage holes shall be removed in time to prevent the parts with leakage holes from being assembled on the vacuum system, which will bring unnecessary trouble for the later debugging.

Third, check whether the performance of vacuum valve and other components can meet the design requirements.

Fourth, according to the electrical diagram, check whether the circuit is in good condition, whether the switch can point to the open circuit position, whether the relevant test instrument can be in the zero position, whether the ground wire can be grounded, whether the operation is safe, etc.

Fifth, leak detection in the process of vacuum system installation. The leak detection of vacuum system in the process of device debugging is the main part of vacuum leak detection. Therefore, the device process must be separated from leak detection. If multiple vacuum pumps are installed in series on site, the mechanical pump should be installed and pumped first, and then the main pump should be installed after reaching the vacuum degree, instead of stopping leak detection after all the installation of the system is completed. Otherwise, once there is air leakage, it will bring trouble to the device. At the same time, pay attention to whether there are scratches on the rubber ring and flange sealing surface at the static sealing flange to prevent air leakage after installation. After the vacuum system device is completed, the no-load commissioning and the commissioning in the process of process consumption will be stopped.


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Sealing mode of vacuum pump

When the vacuum pump is working, it has higher requirements for sealing effect. Because once the sealing effect of the vacuum pump in operation does not meet the relevant requirements, it is easy to cause the vacuum pump failure, unable to run normally. Therefore, before the formal start-up of the vacuum pump, its sealing effect must be tested to ensure that there is no problem before starting to use. At present, there are four sealing methods for the vacuum pump 

1. Oil seal is a self tightening lip seal. The utility model has the advantages of simple structure, small volume, low cost, convenient maintenance and small resistance moment. It can not only prevent the medium leakage, but also prevent the external dust and other harmful substances from entering the vacuum pump. 

2. Power supply sealing. When the vacuum pump is running, the pressure head generated by the auxiliary impeller balances the high-pressure liquid at the outlet of the main impeller to realize sealing.

3. The labyrinth seal of vacuum pump has reasonable design, excellent processing, good assembly, high-speed rotation and good operability.

4. Packing seal is to put the compressed and elastic packing into the stuffing box of vacuum pump, and convert the axial pressure of pump cover into radial sealing force for sealing

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Dry Scroll Vacuum Pump

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Influence of working conditions on the service life of slurry pump

Slurry pump in different industries play a different role, then the wear conditions are different, so the service life is also different. Slurry pump has been used in mineral processing, electric power, coal washing, sand separation and other fields. In the mineral processing industry, the working condition of ore primary separation is bad, so the service life of slurry pump is low. Of course, different ores have different abrasivity. 

For example, in the concentrate transportation section, the relative abrasion resistance is reduced, and the overall service life of the pump is longer. In the field of coal washing, larger coal block and coal gangue are easy to block the slurry pump, which is also easy to reduce the service life of slurry pump. In the fields of electric power, sand selection and other fields, due to the different working environment, there are different degrees of abrasion on the special pump of aerated concrete, which has a certain impact on the service life of the submerged slurry pump. Therefore, in the purchasing process, the general user often asks the service life of the supplier's products. 

Strictly speaking, any manufacturer will not promise an accurate service life cycle for users without any basis, because the service life of flow passage components depends on many different factors, and the diversity and complexity of working conditions lead to different service life of materials with the same quality. But in the early selection aspect, we can let the powerful manufacturers help to select the type. The use of aerated concrete pump is easy to wear, and its service life is also greatly affected. However, the use efficiency of slurry pump can be higher through reasonable design, correct operation and regular maintenance.

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Roots Blowers

Roots Vacuum Pump 

Working environment requirements of vacuum pump

Many ultra-high vacuum gauges have been developed in vacuum pumps, such as cold cathode magnetron gauge, suppression gauge and bend beam gauge. However, for many research work, it is not enough to rely on full pressure data alone. Let's learn about the ambient temperature of the water ring vacuum pump. 

For example, the process of adsorption, condensation and desorption in vacuum system involves the interaction between the material and the residual gas molecules on the surface of the vessel and inside the system. At this time, the data of gas composition and partial pressure in the system can explain the problem better than the full pressure data. Gas analysis and partial pressure measurement in vacuum are usually performed by dynamic mass spectrometer. If there are solid particles in the medium to be transported, filter screen should be added at the pump inlet; if there are ferromagnetic particles, magnetic filter should be added. The ambient temperature of water ring vacuum pump should be less than 40 ℃ and the temperature rise of motor should not exceed 75 ℃. After 1000 hours of normal operation of the magnetic pump, the bearing and end face moving ring shall be disassembled and inspected for wear, and the vulnerable parts that are not suitable for reuse shall be replaced. For the medium easy to precipitate and crystallize, the conveying liquid shall be cleaned in time after use to drain the liquid in the pump.

The vacuum pump must always be kept clean. Other objects shall not be placed on the water ring vacuum pump, and the channels around the vacuum pump shall not be blocked to facilitate maintenance and operation; the tightness of the triangular belt shall be paid attention to and adjusted; whether the air leakage occurs at the pipe joints and whether the pre vacuum in the box body drops, otherwise, it shall be repaired in time; the cooling water shall be checked regularly; the driving shall be conducted every time To start 4-6 times intermittently, within 2S each time, in order to overcome the larger torque when starting.



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Leak detection of vacuum system installation and debugging design

Vacuum system has strict requirements for sealing, so leak detection is needed in every stage of vacuum system design. The installation and debugging stage is the main body of leak detection for vacuum equipment or system. This talk about vacuum system debugging, leak detection work need to pay attention to what matters. 

In the process of vacuum system installation and commissioning, the key point of leak detection is to check and ensure the sealing of the connecting parts. The premise is that the air tightness of vacuum equipment weld has passed the leak detection in the processing stage, so as to avoid leakage detection in many aspects at the same time, resulting in increased workload and difficulty. For large and complex vacuum equipment, it is better to adopt segmented leak detection. After each stage is completed, the corresponding joint parts and welds shall be inspected once, and the next step shall be carried out after the requirements are met.

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Relationship between vacuum degree and pressure in vacuum pump selection

In the selection and use of vacuum pump, we usually use the limit pressure or vacuum degree, as well as pumping speed, flow and other parameters to determine the performance of vacuum pump. And then there's a problem here, where many customers struggle with the relationship between vacuum and pressure. 

Vacuum refers to the rarefaction of a gas. We usually use "high vacuum" and "low vacuum" to express it. In other words, the rarer the gas is, the higher the vacuum degree is; otherwise, it means the vacuum is low, which is always expressed by pressure. The pressure in vacuum system is synonymous with pressure, which refers to the vertical force of gas on the surface of solid or liquid per unit area. Therefore, we can generally understand that the more gas, the greater the natural force on the surface of the object, the greater the pressure; on the contrary, the less gas, the smaller the force, the smaller the pressure.

The higher the vacuum degree is, the thinner the gas is. That is to say, the less the pressure on the object will be. The lower the vacuum degree is, the more gas there is, the greater the pressure will be.

Therefore, when we select the vacuum pump, we can see that the lower the limit pressure, the higher the vacuum degree of the vacuum pump, and the more thorough the corresponding pumping performance, which can achieve lower pressure in practical application.

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Roots Blowers

Roots Vacuum Pump 

Choose vacuum valve rubber gasket seal

In the application of vacuum system, the installation of vacuum valve needs rubber gasket seal or metal gasket seal to ensure the sealing performance of the system.

Rubber gasket seal is made of rubber material, which uses the rubber gasket pressed between valve plate and valve seat, and fills the uneven surface by elastic deformation of rubber to realize sealing. In the selection process, attention should be paid to:

1、 The selected rubber gasket sealing structure should be simple and easy to manufacture.

2、 The seal shall be easy to disassemble and repair. 

3、 As far as possible to reduce the bleeding factor of the high vacuum side under the valve plate, such as choosing the gasket material with low outgassing rate.

4、 After closing the valve, the rubber seal ring section should have the maximum compression deformation.

At the same time, the uneven degree of the rubber gasket sealing seat surface determines the sealing performance when the vacuum valve is closed. Therefore, it is necessary to consider the hardness of the rubber gasket sealing material, the degree of compaction and the surface roughness of the valve seat, and determine the compression ratio of the gasket according to these, so as to achieve the corresponding sealing performance.

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Medical negative pressure system

With the rapid development of the city, the development of the hospital has formed a large-scale comprehensive hospital and specialized hospital, which runs through all departments of the hospital 

1、 With the development of large-scale general hospitals, the transportation path of negative pressure center is longer, so the vacuum requirements are higher and the pumping speed is higher. The original suction and induced draft pumps cannot be completed, and the negative pressure is generally within - 0.05Mpa

 Vacuum Pump Factory Co., Ltd. adopts environmental protection water ring vacuum unit instead of other secondary products, which can solve the following problems:

1. Enough vacuum to ensure the applicability of each room in the hospital

2. Using 100% internal circulation system, environmental protection and water cut-off will not affect the work of negative pressure system

3. The vacuum stability control system is used to ensure the stability of the vacuum degree of the system

2、 Anti rust measures must be taken for the negative pressure station used in micro clinics. Because the equipment is not normally open, it is recommended to use environmental water ring vacuum unit with biological disinfector, which is more suitable for micro clinics and stomatological hospitals.

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2be water ring vacuum pump in environmental sanitation industry

With the development of the city, environmental sanitation has become a major problem, and the removal of fecal water is our research and development direction of environmental sanitation equipment. 

Other vacuum pumps were used in the original sanitation truck. Due to design problems and insufficient vacuum, it is difficult for the truck to fully absorb in a short time, and it is easy to be damaged and has a short service life

2be water ring vacuum pump special-purpose unit is not only high in vacuum, but also stable in service life. The septic trucks produced by many special vehicle factories have been used for many years. They not only serve China, but also export to Southeast Asian countries. We will provide more advanced, more efficient and energy-saving equipment for the sanitation industry, and make due contributions to the environment of urban development.

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Roots Blowers

Roots Vacuum Pump

The importance of shaft sleeve in water ring vacuum pump

Water ring vacuum pump, especially large water ring vacuum pump, is worth tens of thousands less and hundreds of thousands more. As the only assembly place of sealing rope with friction, the shaft sleeve plays the following roles in design and installation: 

1、 The shaft sleeve is generally made of wear-resistant alloy. It is characterized by wear resistance, high hardness, smooth surface and no rust, so it can protect the shaft from wear

2、 Due to the characteristics of the shaft sleeve, the wear of the sealing rope is reduced and the service life of the sealing rope is prolonged

3、 Ensure that the rotor will not be stuck and unable to rotate due to rust when the machine is shut down for a long time

4、 Convenient maintenance, reduce maintenance costs

At present, in order to reduce the cost, many manufacturers use cast iron material as shaft sleeve, which completely loses the original intention of shaft sleeve and has no effect.

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Connection mode of vacuum pump unit

When wiring the vacuum pump unit, attention must be paid to the use of polyester insulation tape. When wrapping, make sure to hold down half of a circle, wrap 8-12 layers, and then wrap two layers of plastic tape for strength. When connecting the vacuum pump unit, the copper core of the cable should be peeled out about 30-35mm long, and the copper wire should be wiped clean with sand cloth to make it bright The copper wire connected to the three core cable shall be stripped 30-35mm and cleaned with sand cloth. 

For the connection of vacuum pump unit, the three core cable and the copper wire part stripped out of the external cable will be inserted, and then a thin copper wire will be used to tie tightly according to the drawing, and the remaining part will be cut off and leveled with scissors to prevent hand binding. When wiring, the three wire ends of vacuum pump should be welded firmly with solder respectively, and the surface of the welding head should be smooth without burr and false welding If the welding is firm or not smooth, the vacuum pump shall be re welded until it meets the requirements.

For the wiring of vacuum pump unit, three wires must be wrapped together with plastic tape and wrapped in two layers. One layer is more than 50 mm above the end of insulation layer of each conductor, and the second layer is more than 50 mm above the end of the first layer. After binding, take a basin of cold water to soak the wrapped wire ends in water safely. After 12 hours, measure the insulation with a 500V megohmmeter, and the insulation should not be less than 50 megohm. Otherwise, it should be re wrapped until it reaches the maximum value Up to the request.

The grounding wire of the vacuum pump unit must also be wrapped up according to the requirements of the submersible cable wiring process; after the vacuum pump unit is connected, the insulation resistance should be continuously measured while going down the well to observe its change, so as to prevent the cable insulation from hanging on the well wall. If it is found that the insulation degree drops rapidly to less than 0.5 megohm, the unit must be brought up to detect the cause.


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Water supply regulation of water ring vacuum pump

 Water ring vacuum pump plays a very important role in our life, because it occupies a great position in industry and agriculture, which not only benefits from its simple and easy operation, but also its high efficiency is also an important point. In these applications, it plays the role of vacuum extraction, and the use can be reflected by the water supply, so how to adjust its water supply? 

1. Since the water supply of vacuum pump has a certain range, in order to obtain the standard water supply and save water, the water supply valve can be adjusted according to the program. 2. When the water ring vacuum pump operates normally, open the water supply valve properly, and then observe the pressure of the inlet vacuum gauge. 3. Slowly turn down the opening of the water supply valve. When the pointer of the vacuum gauge starts to fluctuate or drop, the water supply is not enough. Open the water supply valve again slowly. When the pointer of the vacuum gauge is stabilized again, the water supply is the standard water supply.

Here we should pay attention to that when the water supply is insufficient, the pumping capacity of the equipment will decrease, and the work will be unstable. If the water supply is too much, it will cause waste of water resources, increase the shaft power of the pump, and even burn out the motor.


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Roots Blowers

Roots Vacuum Pump

Roots vacuum pump cleaning pump cavity

 

The use of Roots vacuum pump has very high requirements for cleanliness, because the overall situation is relatively clean, in order to ensure that the gas is not polluted, otherwise it will affect the use of vacuum pump. The pump cavity is also a part of the cleaning process, which must be done well to prevent those dirty things from being sucked in. When cleaning the pump cavity, we must pay attention to:

1. In unclean working conditions, dirt will settle in the pump chamber or rotor of Roots vacuum pump. After removing the inlet and outlet connecting pipe, blow out the dirt with dry compressed air or wipe the dirt with solvent.

2. Can not be blown out by the pump cavity and wipe off the dirt can be wire brush, metal wool or scraper to remove, and then change the oil.

3. During cleaning roots vacuum pump, the rotor must be turned by hand, and there should be no loose sediment in the pump.

4. After cleaning, turn the rotor slowly by hand to see the pump running. They should rotate freely without any resistance.

Note: Roots pump does not need to be disassembled, if necessary, contact the manufacturer to dismantle.

The roots vacuum pump just bought in the process of use, the gas is basically clean, this is because all parts of the pump are well cleaned. Users must also do a good job in cleaning or regularly find the manufacturer to clean for you. If the pump is not cleaned for a long time, then their efficiency will certainly not be very high. When cleaning the pump cavity, be sure not to power on, otherwise it is very dangerous.


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Which vacuum pump is environmentally friendly and energy saving

The energy and environmental problems of vacuum pump have attracted great attention of all countries in the world. The products in the future will no longer be practical, but will develop in the direction of environmental protection, energy saving and convenience. Vacuum pump products are no exception, in order to stand in the fierce competition market, we should pay attention to energy saving and environmental protection. 

In order to promote energy conservation in the whole society, improve energy utilization efficiency and economic benefits, protect the environment, ensure the development of national economy and society, and meet the needs of people's lives, the latest energy conservation law of the people's Republic of China has been promulgated. Among them, Article 39: the State encourages the development of general energy-saving technology, gradually realizes the economic operation of motor, fan, pump equipment and system, develops motor speed regulation and power electronic energy-saving technology, develops, produces and popularizes high-quality and low-cost energy-saving equipment, and improves the utilization efficiency of electric energy. Many people in the vacuum industry agree that the vacuum industry is a city with great potential We are more optimistic about energy-saving and environmental protection vacuum products.

Some processes in chemical production often need to be carried out below atmospheric pressure. Vacuum pump is to obtain absolute pressure lower than atmospheric pressure mechanical equipment. There are many types of vacuum pumps。

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Refrigeration device of vacuum unit

The heat produced by roots rotor vacuum unit is produced by conveying and compressing gas, which must be transmitted from the rotor to the shell. However, under low pressure, the heat transfer and convection performance of gas is very poor, which makes the heat absorbed by the rotor difficult to disperse, resulting in the rotor temperature always higher than the shell temperature. Due to the thermal expansion of the rotor, the gap between the rotor and the rotor, between the rotor and the pump shell is reduced, especially in the case of high pressure difference, which even causes the rotor to be stuck and causes the pump to be damaged. In order to make the roots rotor vacuum unit work under a higher pressure difference, to expand the scope of use and increase the reliability of the pump, it is necessary to try to dissipate the heat generated by the rotor, that is to say, to cool the rotor. 

In order to understand the essence of air cooling, let's take a look at the flow of gas at the exhaust side of roots rotary vane vacuum unit. The process of compressed gas inhaled in roots rotary vane vacuum unit is not continuous, but sudden. The inhaled gas is enclosed in the cavity with the rotation of the rotor, and the gas in the cavity is suddenly connected with the exhaust port with the rotation of the rotor. Due to the high gas pressure on the exhaust side, the gas at the exhaust port will recoil to the cavity, and then be driven out of the pump with the rotation of the rotor. This process exhausts four times in each revolution.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Application of rotary vane vacuum pump in refrigeration system

Vacuum pump is used to extract gas in closed system to obtain vacuum. At present, rotary vane vacuum pump is widely used in refrigeration maintenance. It can pump the gas in the refrigeration system from 105Pa to below 1pA. 

The vane vacuum pump uses a rotor inlaid with two sliding blades, which is eccentrically installed in the stator cavity. The outer circle of the rotor is tangent to the surface of the pump cavity. When the pump rotor rotates, centrifugal force and spring pressure make the top of the vane keep in contact with the inner wall of the pump chamber. Driven by the motor, the eccentric rotor drives the vane to rotate in the stator cavity, so that the volume of the chamber at the air inlet gradually expands, the air pressure drops, and the gas is inhaled; at the same time, the volume of the chamber connected with the exhaust port is gradually reduced, and the air pressure is increased. After reaching a certain pressure, the exhaust valve is opened to discharge the gas, so as to achieve the purpose of extracting gas and obtaining vacuum.

When using rotary vane vacuum pump for vacuum pumping, in order to make the system reach a higher vacuum degree, the following points should be noted:

(1) It is necessary to ensure that the oil in the pump reaches the standard line and the oil quality is clear. If the oil becomes dirty and saponified, it should be replaced; the new oil should be the special oil for the vacuum pump.

(2) The filter screen should be cleaned frequently to ensure smooth gas path.

(3) The vacuum pump with proper pumping speed should be selected according to the size of the system, so as to avoid damage to the rotating plate due to too long working time and high temperature rise of the pump.


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Vacuum pump oil filtration and replacement skills

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. Through separation and deposition, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the drain 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 the end cover and pump chamber for operation. 

In the process of using vacuum pump oil, because of oxidation, emulsification and other factors mixed with various impurities, some of the oil degenerates. When the degenerated 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 separated out, resulting in the increase of vapor pressure of vacuum pump oil and the deterioration of its function. At the moment, the pump oil can not be used continuously. It is necessary to replace the pump oil with a new one.

In order to prevent the dust and particles in the vacuum pump oil from entering the pump cavity along with the pump oil. For some technical processes. In the process of pump operation should be equipped with continuous filtering equipment. 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. Through separation and deposition, the emulsified oil, water, dust and impurities sink into the bottom of the auxiliary oil tank and are discharged regularly by the drain valve. The relatively clean oil is filtered by the filter in the middle and upper part of the auxiliary oil tank, and then enters the oil separation chamber through the oil inlet pipe, and then supplies the end cover and pump chamber for operation.


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Features of rotary vane vacuum pump

Rotary vane vacuum pump has become the industry benchmark with its consistent solid durability and operational reliability. Worldwide, more than 1 million of these vacuum pumps are widely used in various harsh industrial fields every day. 

Over the years, we have been committed to the noise control technology of rotary vane vacuum pump, adopting the world's advanced low-noise design and precision processing, seamless assembly, so as to achieve the well-known low-noise industry.

Double stage rotary vane vacuum pump with its world leading core technology of continuous improvement, whether intermittent use or continuous non-stop operation. Double stage rotary vane vacuum pump adopts high compact design, which has the characteristics of strong durability, stable high vacuum, strong steam drainage capacity, continuous operation within the full pressure range!


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Roots Blowers

Roots Vacuum Pump 

Methods to reduce cavitation rate of Roots vacuum unit

If roots vacuum unit works for a long time under cavitation condition, it will cause bad conditions such as noise and vibration. Therefore, it is necessary to avoid working under cavitation condition as far as possible 

1. Reduce the temperature of the working fluid

On the premise that the operating point of Roots vacuum unit is fixed, the effect of cavitation can be prevented by reducing the temperature of working fluid. Liquid with lower saturated vapor pressure is used as working fluid.

2. Operate in the safe area to improve the accuracy of type selection

This requires that in the selection stage, when selecting the suction pressure and working fluid temperature, the pressure range prone to cavitation should be avoided as far as possible.

3. Install cavitation protection line or check valve

When the bubble generated in the cavitation process ruptures in the compression process, the introduction of high pressure non condensable gas from the outside can timely supplement the space caused by bubble rupture, which can greatly reduce the damage of cavitation to the pump and reduce the noise and vibration caused by cavitation. The impeller and disc of the pump are made of materials with strong anti cavitation ability.

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Gas drainage by vacuum pump / compressor

Gas accident is the most important thing in the coal mine industry in recent years. Therefore, the equipment safety of the coal mine industry can not be ignored. Since the 1950s, China began to carry out CBM drainage, and the amount of gas drainage increased continuously, which basically achieved the goal of coal mine safety and controlled the occurrence of gas accidents. There are several basic forms of gas drainage by imported 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 imported vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. At present, the imported 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 technology of gas drainage is to set up a gas pumping station on the ground and connect with the drainage borehole through the underground gas drainage pipeline system. When the pump is running, it will cause negative pressure, and the gas will be pumped out into the gas tank or directly supplied to the user. If the amount of gas extracted is small or unstable, it can be directly discharged into the atmosphere.

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Dry Scroll Vacuum Pump

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Principle of water cooled roots blower

The principle of water-cooled roots blower? As the name implies, the heat dissipation of Roots blower is realized by water cooling. Many customers do not know about the water-cooled roots blower. Today, the editor will bring you the relevant knowledge of water-cooled roots blower. 

As we all know, the working principle of Roots blower is completed by the cooperation between the fan body and the motor. When the pressure and air volume of Roots blower are different, some fans with extremely high pressure will generate heat during operation. Generally, when the pressure is higher than 80kPa, it is necessary to install a water-cooled circulating cooling system, The purpose of this is to protect the bearing and gear from damage caused by high temperature, ensure the normal operation of the fan and prolong the service life.

After installing water cooling system inside roots blower, it can cool down the whole structure of the fan very well. The temperature difference between the water-cooled roots blower and the water-cooled roots blower is about 10 degrees Celsius. Although the water-cooled roots blower has the characteristics of rapid cooling, it has the risk of freezing damage in the cold winter in northern China. Therefore, customers should carefully re-examine whether they need water cooling when purchasing fans Consider.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

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Judgment method of screw vacuum pump

Dry screw vacuum pump is a new type of vacuum pump, which is developed to replace the traditional water ring vacuum pump, oil ring vacuum pump and other pump types. Because of its unique design principle, it can be oil-free and water-free, and can be used as corrosion-resistant coating. The excellent sealing design will far exceed the performance of traditional vacuum pump in any aspect. 

How to judge whether the dry screw vacuum pump is qualified can be judged from the following aspects:

1. Limit vacuum degree: of course, the lower the limit vacuum, the better. At present, the domestic one is about 5pa, while the imported one is about 1pA.

2. Vibration and noise: vibration must be small, noise must be less than 80 dB. 

3. If it is used in a corrosive environment, it is better to ask the manufacturer for a sample of the same coating, and put it in the factory for a test. If the coating or coating ratio used by each manufacturer is different, its performance will be greatly different.

4. Sealing: This is also very important, but we can only learn from the manufacturer's instructions. The most direct way is to determine whether there is leakage through the medium after connecting to the system.

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Characteristics of reciprocating vacuum pump

Reciprocating vacuum pump it is relying on the piston in the cylinder for reciprocating movement to inhale and discharge gas. Reciprocating vacuum pump has horizontal and vertical two types. But horizontal piston vacuum pump is commonly used. Piston vacuum pump can be divided into single cylinder and double cylinder. The structure of the exhaust valve has slide valve type and free valve type. 

Reciprocating vacuum pump features: not afraid of steam, firm, easy to operate. It is mainly used to extract air or other gases from closed containers or reactors. Unless special measures are taken, general reciprocating vacuum pumps are not suitable for removing corrosive gases or gases with particulate ash.

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Dry Scroll Vacuum Pump

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Working process of vacuum pump unit

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

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

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

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Roots Blowers

Roots Vacuum Pump

Sealing reliability and installation requirements of vacuum pump

Under its working pressure, the vacuum pump should be able to discharge all the gas produced in the process of vacuum equipment. Combine the vacuum pump correctly. Due to the selective pumping of vacuum pump, sometimes one kind of pump can not meet the requirement of air extraction. It needs several pumps to combine and supplement each other to meet the requirement of air extraction. If the titanium sublimation pump has a high pumping speed for hydrogen, but can not pump helium, and the tripolar sputtering ion pump (or bipolar asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, the combination of the two will make the vacuum device get better vacuum degree. 

Vacuum pump can not work under atmospheric pressure, need pre vacuum, some vacuum pump outlet pressure is lower than atmospheric pressure, need the front stage pump, so all need to combine the pump. Requirements of vacuum equipment for oil pollution. If the equipment is strictly required to be oil-free, all kinds of oil-free pumps should be selected, such as: water ring pump, molecular sieve adsorption pump, sputtering ion pump, low-temperature pump, etc. If the requirements are not strict, you can choose to have an oil pump, plus some anti oil pollution measures, such as adding cold trap, baffle, oil trap, etc., can also meet the requirements of clean vacuum.

The vacuum pump should be installed in a solid place with sufficient space around for inspection, maintenance and maintenance. The foundation level should be kept under the base of vacuum pump. It is suggested to pad damping rubber or install with bolts at four corners of the base to ensure smooth operation and small vibration of vacuum pump.

The connecting pipe between vacuum pump and system shall be sealed reliably. Metal pipeline connection can be used for small vacuum pump, oil resistant rubber shall be used for sealing gasket, and vacuum rubber pipe can be used for small vacuum pump connection. The pipe diameter shall not be less than the suction diameter of vacuum pump, and the pipeline shall be short with few elbows. (the welding slag in the pipe should be removed when welding the pipeline, and it is forbidden to enter the vacuum pump cavity.)


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Oil diffusion pump vacuum system pollution and Prevention

The vacuum system of oil diffusion pump is the most commonly used vacuum system, and the vacuum degree range is 1.3 × 10-3 ~ 1.3 × 10-5 PA. All kinds of vacuum formed by vacuum system of oil diffusion pump

After long-term operation, the common defect of the device is that the vacuum degree cannot be pumped up or the vacuum degree cannot reach the original limit vacuum level. Oil vapor pollution and vacuum technology 

The pollution of various pollutants in the process is related to

(1) Clean the vacuum chamber regularly;

(2) Stop cleaning oil seal mechanical vacuum pump and oil metal diffusion pump regularly

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Dry Scroll Vacuum Pump

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Vacuum penetration technology of vacuum pump

Vacuum impregnation in food industry refers to the process that food is directly placed in the impregnation solution of container. Under vacuum and normal temperature, through long-time immersion, the impregnation liquid can slowly penetrate into the food and complete the process of taste. It is often used in the processing of fungus food. Compared with room temperature impregnation, it has a shorter time and more delicious effect. 

Most of the vacuum impregnation equipment in the prior art includes the impregnation tank, the air exhausting device, the feeding device and the discharging device. After the materials are placed in the impregnation cage, they are placed in the impregnation tank as a whole. After vacuumizing, the impregnating material is discharged and the impregnation cage is put forward. 

In the long-term working process, the staff found that the existing technology has the problem of uneven taste of materials. For food, there are often dead points where the raw materials are stacked, which are difficult to be touched by the impregnating materials. At these dead points, the finished products will not taste good.

In order to solve the problem that the finished product in the prior art can not taste evenly and the quality control is poor. A kind of vacuum impregnation equipment is put forward based on the practical model.

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Roots Blowers

Roots Vacuum Pump 

Performance of oil free vacuum pump

The working principle of oil-free vacuum pump is the same as that of general positive displacement pump. It is composed of stator, rotor, rotating plate, cylinder block, motor and other main parts. The rotor with rotating blades is eccentrically installed in the stator cylinder. When the rotor rotates at high speed, the four radial sliding blades in the rotor slot divide the pump chamber into four working rooms. Due to the centrifugal force, the rotating blades are close to the cylinder wall, separating the stator inlet and outlet. The operation is repeated to change the volume and discharge the inhaled gas from the exhaust port, so as to achieve the purpose of air extraction. 

At present, there are few domestic oil-free vacuum pump manufacturers. Basically, they can only produce rotary vane vacuum pump products that must be filled with vacuum oil. Basically, the market is imported oil-free vacuum pump products. It has the advantages of simple structure, easy operation, convenient maintenance and no pollution to the environment. The two series of oil-free vacuum pumps have good durability. They are vacuum pumping, compression and dual-purpose vacuum pumps. They are basic equipment with a wide range of applications to obtain vacuum.

The oil-free vacuum pump has the advantages of convenient maintenance, easy operation, simple structure and no environmental pollution. The oil-free vacuum pump has good durability. It is a vacuum pump, compression and dual-purpose vacuum pump. It is a basic equipment with a wide range of applications to obtain vacuum. Compared with oil pump, oil-free vacuum pump has low vacuum degree and small pumping capacity, but it is small in size, easy to install, easy to maintain, convenient to move, no oil fume and no pollution to the environment, especially in the laboratory with high requirements. It is also one of the most common equipment in the laboratory. Therefore, when purchasing the oil-free vacuum pump, the vacuum degree required to work must be determined first. If the vacuum degree required is high, the vacuum pump selected shall be higher than the vacuum degree required, otherwise, the vacuum pump cannot meet the requirements of vacuum pumping, and the working requirements will not be met. Secondly, the pumping rate of oil-free vacuum pump should be slightly greater than the required pumping rate, so as to better meet the needs. Finally, see whether the extracted gas is corrosive. Corrosive gas will corrode the pump. Special materials must be used to meet the demand

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Key points of single stage rotary vane vacuum pump

Single stage rotary vane vacuum pump is also called XD rotary vane vacuum pump. Generally, single-stage rotary vane vacuum pump oil conforming to sh0528-92 specification should be used for single-stage rotary vane vacuum pump. Single stage rotary vane vacuum pump oil with ISO ~ vg100 viscosity grade at ambient temperature of 10 ℃ ~ 40 ℃. When the ambient temperature is 0 ℃ ~ 10 ℃, the vacuum pump oil of ISO ~ vg32 viscosity grade is used. When the vacuum pump is running, the oil level must be 1 / 2-4 / 5 of the oil window height. 

Oil level and oil contamination should be checked regularly (once a week is recommended). If the oil level is too low, the single-stage rotary vane vacuum pump should be stopped and suitable vacuum pump oil should be 4 / 5 of the oil window height. If the oil is polluted, the oil will be blackened, emulsified and thickened, and the oil should be changed in time. The single-stage rotary vane vacuum pump is recommended to change oil after 150 hours of operation for the first time. After that, change the oil every 500 hours. At the same time, the oil filter should be changed. If the oil is polluted, blackened, emulsified and thickened, the oil should be changed in time. Clean the pump before adding new oil. 

In the cleaning and oil changing steps, stop the single-stage rotary vane vacuum pump and drain the hot oil. Screw on the drain plug and run for 5 ~ 10 seconds. Drain the oil completely. Fill cleaning oil (No. 32 ordinary machine oil) to 3 / 4 of oil window height. Run the single-stage rotary vane vacuum pump for 5-10 minutes. Stop the pump and drain the oil. If the oil cannot reach the request, repeat steps 4 and 5. Screw on the drain plug and run for 5 ~ 10 notes.

If the temperature of the pump rises obviously, the motor current reaches or exceeds the rated current, and there is oil smoke at the exhaust port of the pump, it is necessary to check whether the exhaust filter is blocked. If it is blocked, it should be replaced in time. The exhaust pressure gauge can be installed at the oil filling hole of the pump to check whether the filter is blocked. When the pressure exceeds 0.6 bar (gauge pressure), change the exhaust filter.

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Operating characteristics of vacuum unit

In the process of application of vacuum pump unit, its main role is to improve the vacuum degree of vacuum system and the pumping speed under high vacuum environment. Since there is no gas contraction in the operating process of roots pump, when roots pump directly discharges into the atmosphere, the pressure difference between suction port and exhaust port is too large, which will overload the vacuum pump. If the power of vacuum pump motor is simply increased, it will constitute a vacuum pump Heat causes the tiny gap between the vacuum pump rotors to be quickly blocked by heat shrinkage. 

In order to ensure that the vacuum pump unit can reach a higher vacuum, it is necessary to ensure the gap between the vacuum pump rotors. Therefore, it is necessary to set up a front stage pump when the vacuum pump is used. The vacuum pump can be started when the pressure in the system is pumped to a certain range with the front stage pump, so as to avoid overload of the vacuum pump. The front stage pump can choose screw vacuum pump, rotary vane vacuum pump, scroll vacuum pump and other vacuum pumps which can discharge air directly.

Under normal conditions, the vacuum degree of a single screw vacuum pump can be better than 2-3 water ring or reciprocating vacuum unit. If the demand still insists on higher pumping speed in high vacuum environment, it is recommended to use with vacuum pump. Our vacuum pump adopts hydraulic coupling planning, which can start the unit at the same time under normal pressure. Due to the early intervention of the pump, the pumping speed of our unit is increased by more than 30% compared with the traditional unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

Maintenance of oil free vacuum pump

Oil free vacuum pump is a kind of mechanical vacuum pump which can work without any oil for smooth operation. The utility model has the advantages of simple structure, convenient operation and maintenance, and no environmental pollution. Oil free vacuum pump is a durable vacuum pump. It is a vacuum pump for vacuumizing, tightening and dual-purpose. It is the basic equipment to obtain vacuum and has a wide range of applications. Compared with the oil pump, the oil-free vacuum pump has the advantages of low vacuum degree, small volume, convenient installation, simple maintenance, easy to move, no oil fume and no environmental pollution. 

This is one of the most common devices in the laboratory. Therefore, when purchasing an oil-free vacuum pump, it is necessary to confirm the work request of vacuum degree. If the vacuum degree is high and the vacuum degree is higher than the requested vacuum degree, or the vacuum degree cannot be satisfied, the work request cannot be satisfied. The second is the pumping speed of oil-free vacuum pump, which will be slightly higher than the requested pumping speed in order to better meet the demand.

Finally, to see whether the gas can be corrosive and whether the corrosive gas can corrode the pump, special data must be used to meet the demand. The working principle of edit pump is the same as ordinary positive displacement pump. It is composed of stator, rotor, rotor, cylinder, motor and other main components. When the rotor rotates at high speed, the four radial sliding rotors in the rotor slot divide the pump chamber into four chambers.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

The material transportation uses the jet device

At present, pneumatic jet, a kind of powder conveying device, has appeared in the market, and how powerful its claimed function is. The principle of its use is to use the "Venturi principle" jet principle to drive the flow of high-pressure gas in the pipeline to form a vacuum, so that powder can be sucked. 

However, the application of the jet device has low vacuum degree, low material suction height, high gas consumption and low efficiency. 

The water ring vacuum pump is very practical in material transportation. Many people do not understand the installation points of water ring vacuum pump and the requirements of material pipeline. Through collecting the actual requirements of users, a variety of water ring vacuum pump material transportation systems are designed, which are simple, convenient, environmental protection and fully adapt to the needs of material transportation in various industries.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Pressure parameters of vacuum system

Pressure parameter can be seen everywhere in vacuum system, which refers to the vertical force of gas on the surface of solid or liquid, and it is synonymous with pressure in vacuum system.

The most common pressure parameter is naturally the limit pressure. Limit pressure is one of the main parameters of vacuum pump performance in vacuum system. Popular understanding is that in the process of vacuum system pumping, after a long time of pumping, when the pumping speed of vacuum pump or vacuum unit is 0 or the pressure parameters of vacuum chamber are always maintained at a certain value, that is the limit pressure of vacuum pump or vacuum unit.

The second is work pressure. Working pressure is the pressure parameter necessary to ensure the process implementation and product quality in the enterprise production process. In the process of vacuum equipment selection, in order to meet the process requirements, the limit pressure of the equipment will be about an order of magnitude lower than the working pressure.

Foundation pressure. In some process fields or technicians, the base pressure is also called background pressure, which refers to the pressure in the vacuum chamber when the production process begins to be implemented. For example, magnetron sputtering applications may need to pump the local pressure to 10-4 PA, while the working pressure of sputtering process may be about 1 PA.

Residual pressure. In some cases, residual pressure is the same as the limit pressure, which refers to the total pressure of residual gas in the vacuum chamber after a period of pumping operation of vacuum pump or vacuum unit. If the vacuum system has no pumping speed at this time, the residual pressure is the limit pressure of vacuum pump or vacuum unit.

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Roots Blowers

Roots Vacuum Pump

Regeneration of cryogenic vacuum pump

Unlike other gas transfer pumps, cryogenic pumps will be saturated in the process of gas capture, so it is necessary to release the adsorbed trapped gas to recover the trapping capacity, which is called regeneration process. 

The regeneration of cryogenic vacuum pump includes partial regeneration (only releasing the gas adsorbed by the secondary cold plate) and total regeneration (releasing all the gas adsorbed by the cold plate). This paper is to understand the low temperature pump regeneration of several ways.

In the regeneration process of cryogenic vacuum pump, the released gas needs to be removed in time to prevent possible damage to the pump body or the glass tube shell of vacuum gauge, or even explosion. Because when the temperature rises to a certain temperature, the desorption speed of the permanent gas is very fast, and the pressure in the pump body can be increased to more than one atmospheric pressure in a few minutes.

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Scroll vacuum pump

The research of vortex vacuum pump began in the late 1980s. A vertical self rotating oil lubricated scroll water ring vacuum pump with pumping speed of 200L / min was developed. Compared with revolution type vortex vacuum pump, the radial clearance of the pump has the advantages of easy sealing and control. Compared with the vane pump, the scroll pump has higher volumetric efficiency, and the vibration and noise levels in the pump are reduced. In addition, due to its more compact structure, the weight and volume of the machine are reduced by 12% and 40% respectively. The research shows the high efficiency of the scroll vacuum pump, and puts forward the effective methods of how to eliminate the clearance volume and control the clearance. With the continuous expansion of the application of vortex vacuum pump in semiconductor industry, people began to devote themselves to the research of dry scroll vacuum pump. The difference between dry scroll vacuum pump and oil lubricated scroll vacuum pump is that there is no oil and liquid in the pump cavity. Therefore, to solve the problem of sealing and cooling in the pump is the key to the research of dry scroll vacuum pump. 

The ultimate pressure that the pump can reach is 5 × 10 - 3T. It uses water cooling method to solve the lubrication and cooling problems of various parts in the pump. The research shows the feasibility of the dry scroll vacuum pump, and effectively solves the problems such as the contact caused by the thermal deformation of the moving disk and the vibration caused by the centrifugal force. Although the cooling problem of dry scroll vacuum pump can be effectively solved by using water cooling method, the structure of the cooling water circuit is more complicated. Two cooling fans are installed on the main shaft, which are respectively located at the ends of the two stationary disks. When the main shaft rotates, the fans rotate together to achieve the cooling effect on the vortex disk. At the same time, it adopts a semi closed structure to solve the cooling problem of the motor. The pump adopts a totally enclosed structure, the vortex disk is a single vortex ring structure, and the cooling fan is installed at the end of the static disk.


Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Development and classification of imported vacuum pump oil

After many years of polishing, China's vacuum technology has made rapid development. At present, it has become an independent basic science with the continuous development of many industrial companies, such as aerospace science, vacuum coating, vacuum smelting, high energy physics, controlled thermonuclear reaction, surface research, etc. The progress of science and vacuum technology is interdependent. As a special lubricating oil for various mechanical vacuum pumps, the imported vacuum pump oil plays the functions of lubrication, sealing and cooling in the vacuum pump. 

Because the mechanical vacuum pump has different models, so the vacuum pump oil must also have suitable viscosity, excellent oil-water separation, good thermal stability and oxidation stability, as low as possible saturated vapor pressure, because the quality of vacuum pump oil indirectly affects the limit pressure, pumping rate, back pressure and oil return rate of vacuum pump equipment. In recent years, with the continuous development of vacuum technology, mechanical vacuum pump develops to high speed, low noise and miniaturization. The linear velocity of the friction pair surface in the pump cavity increases, and the oil temperature rises. Because the mechanical vacuum pump oil tends to be low viscosity, it is required to maintain a low vapor pressure under the working temperature of the pump.

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Roots Blowers

Roots Vacuum Pump