2020年8月31日星期一

High temperature magnetic pump for mold temperature machine


High-temperature magnetic pump is a magnetic drive high-temperature pump specially designed for the mold temperature machine industry, which can reach a high temperature of 180°C to 360°C with high efficiency.

Features of high temperature magnetic pump:

(1) Since the drive shaft does not need to penetrate the pump casing, but uses the magnetic field to transmit torque through the air gap and the thin wall of the isolation sleeve to drive the inner rotor, thus fundamentally eliminating the leakage passage of the shaft seal and realizing a complete seal ,

(2) High requirements are used in the design of magnetic materials and magnetic circuits,

(3) The maintenance and repair workload of the magnetic pump is very small.

(4) The high temperature magnetic drive pump can only transport media without particles.

(5) Under normal and special use conditions, the high-temperature magnetic drive pump does not age and demagnetize over time.

(6) The high temperature magnetic drive pump should avoid dry running to avoid burning of the sliding bearing and isolating sleeve.

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Characteristics and application of vacuum negative pressure station

Vacuum negative pressure station is commonly used in hospitals to provide the vacuum source of medical gas central station. The main structure is a complete set of system with water ring vacuum pump as the main part and vacuum buffer tank as vacuum storage equipment. The vacuum negative pressure device saves the cost and energy and improves the service life of the vacuum pump. 


As to the frequent use of vacuum source and the need for less pumping volume, the negative pressure station system wastes more power than the direct use of vacuum pump as vacuum source, and effectively extends the service life of vacuum pump and improves the economic benefits of the enterprise. The vacuum negative pressure station is composed of single or double vacuum pumps as the main equipment for vacuum acquisition and the vacuum tank as the vacuum storage equipment, The vacuum negative pressure station is formed by connecting the electrical control part, and the double pump task can enhance the guarantee of the system

Vacuum pumps and compressors are usually used to pump gases that do not contain solid particles, are insoluble in water, and are not corrosive, so as to form vacuum and pressure in closed containers. By changing the structural materials. Vacuum negative pressure station can also be used for pumping corrosive gas or using corrosive liquid as working fluid. Vacuum negative pressure station can be widely used in papermaking, chemical, petrochemical, light industry, pharmaceutical, food, metallurgy, building materials, electrical appliances, coal washing, mineral processing, chemical fertilizer and other industries.

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High temperature magnetic pump

Magnetic high temperature pump series small high temperature and high pressure pump 350 ℃, mold temperature machine pump, heat transfer oil pump, hot water pump {100 ℃ - 180 ℃}, low temperature pump - 100 ℃, solar energy pump, is a real substitute for imported high temperature pump series, with reliable quality and favorable price. It can be equipped with explosion-proof motor and special pump for heat transfer oil. It belongs to high-temperature magnetic pump, with no shaft seal, no leakage and long service life. Roller heating heat transfer oil pump, oil heater special pump, film mold temperature machine heat transfer oil special pump, transport corrosive or other special performance liquid, practical in petroleum, chemical, rubber, plastic, pharmaceutical and other fields. General liquid water temperature 0 ℃ ~ 180 ℃, high temperature heat transfer oil - 100 ℃ - + 350 ℃ 


Small power high temperature and high pressure leak free pump 350 ℃, mold temperature machine pump, heat transfer oil pump, hot water pump {100 ℃ - 180 ℃}, low temperature pump - 100 ℃, solar energy pump, is a real substitute for imported high temperature pump series, with reliable quality and favorable price. It can be equipped with explosion-proof motor and special pump for heat transfer oil. It belongs to high-temperature magnetic pump, with no shaft seal, no leakage and long service life. Special pump for heating heat conducting oil, special pump for oil heater, special pump for heat conducting oil for film mould temperature machine. They are used for transporting corrosive or other special properties of liquid. They are applicable to petroleum, chemical, rubber, plastic, pharmaceutical and other fields.

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2020年8月28日星期五

How to use the submersible pump correctly

1. Use of submersible pump 


(1) Check whether there are cracks in the casing of the submersible pump. If there is a crack, it cannot be used.

(2) Check whether the vent hole, water drain hole, oil drain hole and the seal at the cable joint of the submersible pump are loose, and must be tightened if they are loose.

(3) Check the insulation resistance of the submersible pump. Use a 500V insulation resistance meter to test, and the insulation resistance should not be less than 5MΩ. If it is lower than this value, open the water and vent holes, dry or sun dry before use.

(4) The cable of the submersible pump is best not to have connectors. If there are connectors, they should be wrapped up. The entire cable should be free from damage or breakage. Otherwise, the cable should be replaced with a new one. In addition, the cable should be overhead and not too long.

(5) Correct the positive and negative poles of the power supply before starting to prevent the water pump from turning upside down and no water flow.

(6) Perform a comprehensive inspection of the power supply circuit and switch before starting the machine, and leave it on the ground for 3 to 5 minutes if it is running normally, then put it in the water and put it into use.

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High temperature hot oil pump

The high temperature heat pump adopts self heat dissipation structure, which changes the traditional water cooling structure. It has the advantages of simple structure, small volume, low operating cost, good performance and reliable operation. It is the second generation product developed on the basis of digesting and absorbing foreign oil pumps. The basic structure is single-stage single suction cantilever foot support structure. The inlet of the pump is axial suction and the outlet is vertical upward, It is installed on the base together with the motor. 


The support of high temperature hot oil pump adopts the structure of double end ball bearing support. The front end is lubricated by lubricating oil, and the back end is lubricated by grease. There is a guide pipe in the middle to observe the sealing condition and recover the heat transfer oil at any time.

High temperature hot oil pump is composed of pump body, pump cover, internal and external rotors, pump shaft, shaft end combined seal and other parts. The main drive is composed of a set of meshing rotors. The shaft end seal adopts high temperature reflux combined seal, and adopts water tank cooling mode to control the temperature of shaft seal. High temperature gear pump is a positive displacement pump, which transfers melt by changing working volume caused by meshing of driving and driven gears. The working volume is composed of pump body, gear slot and bearing with side plate function. Pump and motor use three claw elastic coupling to form oil pump unit.

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Vacuum booster pump

The vacuum booster pump is mainly used for pumping vacuum from the power assisted braking system of light vehicles, and can also be used for other transport vehicles and construction machinery. The application of vacuum assisted braking system can improve the braking reliability and reduce the driver's fatigue, which is conducive to reduce the incidence of traffic accidents and improve the safety of the whole vehicle. 


At present, the rapid development of domestic light vehicles, which undoubtedly provides a broad market for vacuum booster pump. Therefore, in the process of promotion and use, we must understand and master its performance and principle. Only in this way can the braking performance of the pump be guaranteed effectively, the service life can be extended and the safety protection can be achieved.

The vacuum booster pump is mainly composed of pump body, rotor, slide block, pump cover, gear, seal ring and other parts. When the pump works, the eccentric rotor with four sliding blocks rotates anticlockwise. Under the action of its own centrifugal force, the sliding block slides close to the inner wall of the pump body, and the suction chamber expands continuously. The aspirated gas opens the one-way valve through the suction pipe To keep the pressure) enter the air breathing studio. When the slider is turned to a certain position, the suction is completed. At this time, the aspirated gas is isolated, and the rotor continues to rotate. The isolated gas is gradually compressed and the pressure increases. When the working chamber is connected with the air outlet, the gas is discharged from the air outlet. During the working process of the pump, the sliding block always divides the pump chamber into four working rooms. Every rotation of the rotor, there are four suction and exhaust processes.

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2020年8月26日星期三

Submersible sewage pump

Submersible sewage pump is a kind of pump and motor together, and also enters the work of the pump's liquid products. It has obvious advantages in the following aspects, compared with general horizontal or vertical ratio pumps. Submersible sewage pump sewage pump. 


It is precisely because of these advantages that submersible sewage pumps have received more and more attention from people, and they have been used more and more widely, from simply being used to transport clean water to now being able to transport domestic sewage, industrial wastewater, various construction site drainage, and liquid Feed etc. Municipal engineering, industry, hospitals, construction, hotels, water conservancy construction and other industries play an important role.

However, everything is divided into two. The most critical issue for submersible sewage pumps is reliability, because the use of submersible sewage pumps is submerged; the transmission medium is a liquid mixture containing solid materials, which is close to the pump. And the motor; it is a vertical arrangement, the weight of the rotating parts is in the same direction as the impeller pump bears the water pressure. These problems are in the selection of a sealed submersible sewage pump, electrical load capacity, bearing arrangement and other requirements higher than average.

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Micro air pump


The essence of vacuum adsorption of micro vacuum pump: after the micro vacuum pump is powered on, the pressure difference between the negative pressure generated at the suction port and the external atmospheric pressure is used to firmly absorb the object through the contact elements such as suction cup, so as to play the role of hanging, fixing and moving objects.

The next process of vacuum adsorption is the release of the object after being absorbed. When it is necessary to release the absorbed object, the pump must be shut down first, and do not continue to vacuum. After the pump is shut down, the object may not fall off immediately, because the pump has a certain pressure holding capacity, and the vacuum will continue to maintain for a certain period of time (the length of time depends on the air leakage of the system).

However, the actual situation is that the current dual-purpose micro air pump, micro vacuum pump and so on, including domestic micro air pump, micro vacuum pump and most of foreign micro air pump and micro vacuum pump, because of the internal process principle and other reasons, only allow gas to flow from the air inlet to the exhaust port in one direction, and vice versa. It is not simple to reverse the motor can change the direction of the air flow, to meet the requirements of the release object.

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Magnetic drive pump

Based on the centrifugal pump, magnetic drive pump is a new type of centrifugal chemical process pump, which uses magnetic coupling to realize the non-contact transmission of torque, no shaft seal, full seal, no leakage, corrosion resistance and pollution-free. 


Magnetic drive pump (hereinafter referred to as magnetic pump) is usually composed of electric motor, strong coupling device and centrifugal pump. Its main feature is that the magnetic coupling device is used to transfer power. When the motor drives the external magnetic rotor of the magnetic coupling device to rotate, the magnetic line of force passes through the gap and isolation sleeve, acting on the inner magnetic rotor, so that the pump rotor and the motor rotate synchronously, and the torque is transmitted without mechanical contact Because the liquid is enclosed in a static isolation sleeve, there is no dynamic seal, so there is no leakage.

The magnetic drive pump is designed with advanced technology, which follows the high efficiency and reliability of the original centrifugal pump hydraulically. It cancels the traditional mechanical seal device and changes the rigid connection between the motor and the pump into a non-contact flexible connection, which fundamentally eliminates the shaft seal leakage.

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Stainless steel vacuum pump requirements for pumping

The stainless steel vacuum pump can be used to pump air to reduce the pressure, but what are the requirements for pumping? 


Combine the pumps correctly. Due to the selective pumping, sometimes a stainless steel vacuum pump can not meet the pumping requirements, and it is necessary to combine several pumps to complement each other to meet the pumping requirements. For example, a titanium sublimation pump has a high pumping speed for hydrogen, but cannot pump helium, while a tripolar sputtering ion pump (or a two-pole asymmetric cathode sputtering ion pump) has a certain pumping speed for argon, both Combined, the vacuum device will get a better vacuum.

In addition, some stainless steel vacuum pumps cannot work under atmospheric pressure and require pre-vacuum; some stainless steel vacuum pumps require a backing pump because the outlet pressure of some stainless steel vacuum pumps is lower than atmospheric pressure, so they need to be combined.

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stainless steel vacuum pump working principle


With the needs of social work, stainless steel vacuum pump is constantly popular production, more and more people contact the use of it, the understanding of it also began to deepen, at the same time, there are many want to understand the problem. The following is the working principle of stainless steel vacuum pump.

During the operation of stainless steel vacuum pump, due to the centrifugal force, water forms a closed ring which is approximately equal in thickness and is determined by the shape of pump chamber. The upper inner surface is just tangent to the impeller hub, and the lower inner surface is just in contact with the tip of the blade. At this time, a crescent shaped space is formed between the impeller hub and the water ring, and this space is divided into several small cavities with the same number of blades by the impeller. If the upper 0 ° of the impeller is taken as the starting point, then the volume of the small cavity increases from small to large when the impeller is 180 ° before rotation, and it is connected with the suction port on the end face. At this time, the gas is inhaled, and when the suction is finished, the small cavity is connected with the suction When the impeller continues to rotate, the small cavity becomes smaller, so that the gas is compressed; when the small cavity is connected with the exhaust port, the gas is discharged from the stainless steel vacuum pump.


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stainless steel vacuum pump braking mode

Do you know? There are various braking modes of stainless steel vacuum pump, each of which has its own advantages and characteristics. When we use the vacuum pump, we need to adopt different braking methods in different situations. 


1. Regenerative braking: refers to the stainless steel vacuum pump when decelerating or stopping, the energy generated by braking is fed back to the DC bus through the inverter circuit. After being absorbed by the resistance capacitance circuit, the regenerative braking can only work when the server is working normally. In case of fault, emergency stop and power failure, the motor cannot be braked, and the work is carried out automatically by the system.

2. Electromagnetic braking: the shaft of stainless steel vacuum pump is locked by mechanical device. The electromagnetic braking is generally started after SV and off, otherwise the amplifier may be overloaded. The dynamic brake is generally started after SV, off or power failure of the main circuit, otherwise the dynamic braking resistance may overheat.

3. Dynamic brake: it is composed of dynamic brake resistor, which can shorten the mechanical feed distance of stainless steel vacuum pump through energy consumption braking in case of fault, emergency stop and power failure. The dynamic brake does not need power supply and needs external relay control.

There are three braking modes of stainless steel vacuum pump: regenerative braking, electromagnetic braking and dynamic brake. Which one should be used in the actual operation process should be selected according to the actual situation.

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2020年8月25日星期二

Advantages of vacuum pump oil in use

The main advantages of vacuum pump oil are small clearance, less leakage, high compression ratio, stable pumping speed in a wide range of crude force and wide working pressure range; as the volume of the compression chamber changes continuously, the driving torque change is small, the power change is small, the vibration noise is low, and the reliability is high. This is not available for other types of dry vacuum pumps. 


The problems of oil leakage, noise, oil return pollution, high energy consumption and vibration of ordinary vane oil pump have adverse effects on users, such as oil vapor pollution in biological products industry and semiconductor industry and oil return valve problem in process system. In the coating process of vacuum coating equipment, if the ordinary oil-free vertical vacuum unit is used as the vacuum pump oil in the front stage when coating under 20 ~ 40Pa vacuum condition, the coating process equipment will be polluted and the film forming quantity will be affected.

There is a gap of 509l between using oil pump and using dry pump in semiconductor chip manufacturing process, and the discharged oil mist vapor also pollutes the environment. In particular, the use of oil pump test instruments will cause adverse effects in the industry. The vortex oil-free vacuum pump used in large synchrotron radiation beam line as the front stage vacuum pump is also quite obvious. In addition, the oil-free vertical vacuum unit eliminates the environmental pollution and trouble caused by the oil leakage of ordinary oil pump.

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Vacuum unit pumping gas containing particles

Vacuum unit is used to pump air and other non condensable and non corrosive gases. It is widely used in various vacuum systems which need high pumping speed and low and high vacuum. It is also the first choice for coarse and medium vacuum systems. For example: vacuum smelting, liquid steel degassing, vacuum sintering, dynamic vacuum acquisition in large-scale space simulation experiment, vacuum impregnation treatment of power capacitor and transformer, exhaust of automatic production line of fluorescent tube and bulb, continuous exhaust of heat preservation bottle, pre extraction of vacuum coating equipment, extraction of magnesium reduction process, degassing of monocrystalline silicon refining process, etc. 


If the pumped gas contains solid particles, part of the particles will be discharged from the pump with the gas, and the other part of the particles will continue to rub in the gap in the pump, causing the gap to increase, resulting in the increase of leakage and the decrease of vacuum and gas volume. Therefore, roots vacuum unit is not suitable for pumping gas containing a large number of solid particles, especially solid particles with larger particle size and higher hardness.

The solution to the problem that the gas containing particles must be pumped: if unavoidable, the gas can be purified before entering roots vacuum unit (such as setting filter screen or adding vacuum buffer tank, etc.). If purification is difficult, the particles in the unit should be washed clean after pumping.

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Gas drainage by vacuum pump / compressor

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 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, imported 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.

The target layers of electric drainage include: extraction from mining layer, drainage from adjacent strata, drainage from goaf, etc. 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.

According to the specific location and layout of the mine excavation, the imported vacuum pump station is generally set on the ground (underground). The enclosure (shed) of the gas drainage room should ensure that there are no residents within 50m around the gas drainage room, no open fire within 20m, no inflammable and explosive materials, and four dry powder fire extinguishers and no less than 0.5m ~ yellow sand are installed.

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2020年8月24日星期一

Principle and application range of diaphragm vacuum valve

Diaphragm vacuum valve is to use the valve stem to directly press the rubber diaphragm on the valve seat. Used to cut off or connect air flow. It is often installed between the pumped container and various low vacuum pumps. Its action principle is to rotate the handle to make the valve stem move downward, and press the rubber diaphragm directly on the valve seat to stop the air flow. Rotate the handwheel in the opposite direction, and the valve rod moves upward to drive the rubber diaphragm away from the valve seat and connect the air flow. 


The valve body is made of aluminum alloy. It has the advantages of simple structure, light weight, small volume and good sealing performance. The diaphragm vacuum valve with nitrile rubber is used for the non corrosive gas on the front stage and pre pumping low vacuum pipeline and the temperature is - 25 ~ 80 ℃. The diaphragm vacuum valve with fluororubber can be used in high vacuum system with the service temperature ranging from - 30 ℃ to 150 ℃

The nominal diameters of diaphragm vacuum valves produced in China are 10 mm, 25 mm, 40 mm and 50 mm respectively. Among them, there are five types of GM type high vacuum diaphragm circumference: GM, GMC, gm-kf, gm-d-h (I) and gm-d-h (II). The difference lies in the form of valve connecting flange.


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Measurement of temperature rise and outlet pressure of Roots vacuum pump

The temperature rise of Roots vacuum pump refers to the difference between the maximum temperature and the room temperature measured at all parts of the pump surface under the condition of stable operation of the limit vacuum or rated vacuum (referring to the direct exhaust atmosphere roots vacuum pump). The type of thermometer used for measuring temperature rise is not limited, but it should have a measurement accuracy of ± 1 ℃. When marking the temperature rise, the room temperature at that time and the cooling conditions of the pump, including the cooling method, shall be indicated. If it is water cooling, the temperature of inlet and outlet water shall be indicated. 


The outlet pressure of Roots vacuum pump refers to the pressure measured near the exhaust port corresponding to a certain inlet pressure value under the condition of stable operation of Roots vacuum pump. The test of outlet pressure can be carried out simultaneously with the measurement of pumping rate, starting from the appropriate value close to the limit vacuum until the allowable inlet pressure of the pump is about. The outlet pressure is measured corresponding to each inlet pressure value.

The measurement position of the outlet pressure is specified in the ministry standard. The distance between the pressure measuring tube and the pump outlet flange shall not be greater than the pump outlet diameter, and the opening plane of the pressure measuring pipe shall be parallel to the air flow direction. The insertion depth is 1 / 4 D, but not more than 50 mm.

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Rolling bearing assembly in vacuum equipment

No matter what kind of mechanical equipment and vacuum pump assembly, will encounter the assembly of common parts and special parts, respectively described. 


Assembly of rolling bearing: when rolling bearing is fitted with interference fit, the bearing race will deform. For example, if the diameter of the inner ring increases, the diameter of the outer ring decreases, thus reducing the radial clearance between the raceway surface of the race ring and the ball. If the installation is not correct, the clearance will be too small, so the bearing ball may be stuck, affecting the normal operation of the bearing.

There should be no clearance between the bearing inner ring and the shaft and between the outer ring and the bearing box, because the shaft cannot reach the required centering accuracy.

Generally, the heating temperature of bearing can be selected in the range of 60 ~ 100 ℃, because the tempering temperature of bearing is between 150 ~ 180 ℃. If the heating temperature exceeds 100 ℃, it is easy to cause tempering. Put the heated bearing on the shaft quickly and tap it in with a hammer.

When the outer ring of the bearing is turned by hand, the assembled rolling bearing should be smooth without jamming and noise. Also use a feeler gauge to check whether the contact between the end face of the seat ring and the shaft shoulder is tightly attached to the shaft shoulder, and at the same time, it does not resist the chamfering. The deflection of the bearing on the shaft is a serious defect, which should be solved by investigating the causes.


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2020年8月21日星期五

Working substance of vacuum system

The working fluids of mechanical vacuum pump and steam flow vacuum pump are water, mercury and oil used in water ring pump, mechanical pump, molecular pump, jet pump and diffusion pump. The steam jet pump and diffusion pump rely on the working liquid vapor for jet or diffusion pumping. 


Therefore, at the working temperature of the pump boiler, it is expected that the working fluid has sufficient vapor pressure. At normal temperature, oil vapor may diffuse the whole evacuated vessel and become the limiting factor of limiting vacuum. Therefore, it is hoped that the working fluid has low saturated vapor pressure at normal temperature. In addition to certain requirements for its vapor pressure characteristics, good thermal stability, oxidation resistance and moderate fluidity at room temperature are also required by Yan gas jet pump and diffusion pump. Vacuum pump oil can be roughly divided into five categories: petroleum hydrocarbon, cool, silicone oil, halogenated carbon hydride and ether.

Getters are generally divided into evapotranspiration type and non evapotranspiration type. Evapotranspiration type is sometimes also called diffusion type or flash burning type, such as calcium, magnesium, silver, barium, etc., among which barium is the most commonly used. Non evapotranspiration type is sometimes called coating type or volume type, such as Cuo, Qin, mu, etc., in which CuO is the main component of commonly used getters. In recent years, the evaporable nitrogen doped getters, non digestible chromium aluminum and chromium graphite getters have excellent gettering properties.

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Mistakes in use of roots pump

Roots vacuum pump must be equipped with the front stage pump, roots pump can not be used alone. Roots pump is mostly used in Roots vacuum unit, its function is to improve pumping speed and vacuum degree of the front stage pump. Roots pump should be equipped with bypass valve in the connection with the front stage pump, which can effectively protect roots pump. If the air extraction of front stage pump is unstable or other factors lead to abnormal operation of the whole unit, roots pump with bypass valve will protect roots pump and prolong the life of the whole vacuum unit. 


When choosing roots pump, it is necessary to pay attention to which sealing method of wearing parts of roots pump is. Roots pump adopts mechanical seal, which can effectively improve the working efficiency of roots pump. If the sealing mode of roots pump is shaft sleeve seal, the working efficiency will be greatly reduced. Special attention should be paid to the selection of roots pump.

If the vacuum degree of roots pump is reduced in the process of use, it is necessary to check whether the clearance between roots pump rotors changes. If the rotor clearance of roots pump becomes larger, it is necessary to replace roots pump, because such roots pump does not make static and dynamic balance for Roots pump rotor in the process of production and processing, or it is sealed by shaft sleeve.

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2020年8月20日星期四

sputtering ion pump type selection

When the inert gases such as argon, krypton and xenon are eliminated by the two-stage sputtering ion pump, the argon pressure will rise and then decrease suddenly in the vacuum system, and the pressure change range is 10-2 PA. This phenomenon is called argon instability. The instability of argon in two-stage ion pump after exhausting for hundreds of hours at 10-3pa or thousands of hours at 10-4Pa is given. In order to overcome this phenomenon, several improved structures of various improved sputtered ion pumps have been developed 


The structure of bipolar pump is simple, the magnetic gap of magnet is small, but the starting pressure is low. If it is not started under high pressure and there is no special requirement for inert gas pumping speed, it is better to choose this kind of pump.

If high starting pressure is required, tripole structure or other auxiliary methods can be used. The process of triode structure is complex. If it is tripotential, the power supply is also complex. The magnetic gap of the magnet is also large.

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Vacuum acquisition system

The instrument used to obtain vacuum is called vacuum pump. According to the working principle of the pump, vacuum pump can be divided into two categories. 


The working principle of this kind of pump is to use various inspiratory action to adsorb the gas and store it temporarily or permanently in the pump. Such as sublimation pump, sputtering ion pump, getter pump with sulfuric acid and phosphorus pentoxide to absorb water vapor, low temperature pump with cold trap to capture water vapor at low temperature.

The vacuum system is a closed system which is composed of vacuum pump, vacuum valve, vacuum gauge and other elements such as cold trap according to certain requirements. Two typical vacuum systems are used in freeze-drying. One is to absorb the water vapor sublimated (or evaporated) from the drying oven with P2O5 temperature absorbent, and then the oil diffusion pump is used to remove the water vapor leaked into the system or produced during drying The other is to use cold trap to capture water vapor, use oil seal rotary pump as the front stage pump, roots pump (mechanical booster pump) as the main pump to remove the non condensable gas leaked in or produced in the drying process. These two kinds of vacuum systems can ensure that the drying chamber is in the vacuum state required by freeze-drying.

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Oil seal mechanical pump refueling and oil change

Through the above test, if the vacuum pump has no other faults, whether its limit vacuum degree has indeed become lower, can be better confirmed by measuring with a compression type vacuum gauge. Usually after long-term operation of the pump as long as the value below the label, it should be repaired. First of all, check whether the oil quantity is lower than the center of the oil gauge, whether the oil has deteriorated and whether the oil circuit is open. If there is a problem in this respect, you can add oil or change the oil properly. 


If the vacuum still can not go up, you can adjust the oil valve of each axle or exhaust valve, increase or decrease the oil quantity and dredge the oil way. If there is no effect or the vacuum degree changes little, the sealing inspection can be carried out. If the vacuum gauge needle suddenly changes after pouring the sealing part with cleaner vacuum pump oil, it indicates that there may be a leakage at the dripping place. It is a relatively simple method to use shellac paint (commonly known as foreign thousand paint) as auxiliary sealant. At this time, as long as the brush dipped with shellac lacquer is used to brush the suspicious parts, if the vacuum suddenly rises, the loophole has been blocked, and it can be brushed several times to ensure that it is blocked. Of course, it's better to replace the sealing gasket at the leakage. After the replacement, the vacuum degree will go up.

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Application of ejector in vacuum blowdown system

There are two kinds of ejectors used in vacuum blowdown system: atmospheric ejector and water ejector (jet pump). 


Mobile vacuum toilet usually uses the high-pressure air supply provided by vehicles to produce vacuum through atmospheric ejector, which can reach -0.04mpa ~ -0.05mpa. It has the advantages of simple structure, no moving parts, low price and high reliability; the disadvantage is that the working efficiency is not high. It should be noted that in order to avoid affecting the normal braking of the vehicle when using the atmospheric injector, it is necessary to strictly calculate the air consumption of the atmospheric injector, and increase the air storage tank if necessary. However, it is relatively convenient when the air source of trains and ships is abundant.

The water ejector is mostly located in the vacuum tank or outdoor water collection unit, which takes the gas-liquid mixture collected in the vacuum pipeline as the injection fluid, and the working fluid is the circulating sewage driven by the water pump. This method has been widely used in early design, but it is rarely used at present. At the same time, the water ejector design can also be used in the vacuum toilet system of mobile vehicles.


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2020年8月19日星期三

Electromagnetic vacuum belt charging valve

The electromagnetic vacuum belt charging valve is installed on the vacuum pump to prevent the pump oil from returning, thus avoiding the pump oil from polluting the vacuum chamber. The valve can be sealed in positive direction, but not in reverse. 


When the solenoid valve is closed or suddenly cut off, the pilot valve inflates the upper cylinder chamber, and automatically closes the vacuum system according to the atmospheric pressure difference, and then fills the pump chamber with atmosphere. When the valve is powered on, the pilot valve cuts off the atmosphere and connects the upper cylinder to make the vacuum pump pump pump pump air to the upper cylinder. The piston is pushed by the spring force to open the valve plate. The vacuum pump normally vacuumizes the vacuum system. When there is no pressure difference on both sides of the valve plate, the valve can not be used, and the valve plate is in swimming state. It should be noted that the installation height of the valve should be more than 1000mm higher than the suction port of the vacuum pump, so as to avoid direct impact on the valve core channel due to the return oil of the pump.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

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Vulnerable parts of reciprocating vacuum pump

Reciprocating vacuum pump has great advantages in the market competition, but users often encounter some problems of replacement of vulnerable parts in use. The following is a simple list of vulnerable parts of reciprocating vacuum pump for users to choose: 


Piston rod copper sleeve, crosshead, crosshead pin, connecting rod copper sleeve, piston rod packing, connecting rod bearing bush, piston ring, big and small spring, straight cylinder spring, orifice valve piece, five hole valve plate, etc. the above products are vulnerable parts of W-type reciprocating vacuum pump. As long as the normal maintenance, regular inspection and replacement of vulnerable parts are required for a normal reciprocating vacuum pump, the general service life can reach 7-10 years.

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Roots Blowers

Roots Vacuum Pump 

Relationship between vacuum adsorption and vacuum pump system

In the vacuum generator system, in order to ensure the maximum vacuum degree of the vacuum suction port and maintain a certain vacuum degree in case of power failure, the connecting pipe between the vacuum generator and the vacuum adsorption fixture should be as short as possible, and a one-way valve can be set between the vacuum adsorption fixture and the vacuum generator. 


The maximum vacuum degree of vacuum pump system can reach 101.3kPa, and the suction flow of vacuum can also be large. However, the problems of vacuum pump system are: complex mechanism, large volume, heavy weight, high price, inconvenient installation, maintenance, difficulty in compounding with accessories, pulsating vacuum pressure, slow vacuum generation and release, etc. The maximum vacuum degree of the vacuum sounder system can reach 84 kPa, and the suction flow of vacuum is not large. However, its advantages are simple structure, small volume, light weight, low price, convenient installation, no maintenance, simple compounding with accessories, no pulsation of vacuum pressure, fast generation and release of vacuum, etc. When the maximum vacuum degree of the vacuum suction port is low and the leakage rate of the vacuum adsorption fixture and the workpiece is less, the true value is used

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2020年8月18日星期二

What is the working principle of hydraulic ejector

Hydraulic ejector has double functions of vacuumizing and condensing secondary steam. It is a vacuum unit composed of nozzle, suction chamber, conical guide baffle, mixing chamber, throat, diffusion pipe and inlet pump. 


The hydraulic ejector uses the pressure of the water pump to put water into the nozzle. The water pump adopts 3k-9 water pump in series, or uses five-stage centrifugal pump. The flow of the pump must meet the demand of secondary steam cooling water. Its head must also meet the requirements of water inlet pressure of hydraulic ejector. When the water with a certain pressure passes through the nozzle with small cross-section area, a high-speed jet of 15-30 M / s will be produced at the nozzle outlet. After a certain distance, the jet water will converge on the same focus accurately. Due to the increase of kinetic energy at the nozzle outlet, the potential energy at the nozzle outlet will be reduced, resulting in a certain negative pressure. The secondary steam will be continuously sucked in to cool it with the top entry The water is in direct contact with cross flow, and carries out strong heat and mass exchange, which makes the secondary steam condense into liquid, and makes its volume decrease rapidly. Thus, a certain vacuum degree is obtained and the concentration process can be carried out smoothly. At the same time, the non condensing gas is pumped out by the high-speed jet beam and discharged out of the system through the throat, diffusion pipe and discharge pipe.

When installing a hydraulic ejector, the lower end of the discharge pipe does not need to be immersed in the water layer of the water tank. The water seal formed when the lower end extends into the water can not overcome the phenomenon of backflow of cooling water, on the contrary, it will only increase the backflow of cooling water. The hydraulic jetting apparatus has double functions, no need to install vacuum pump and water pump. It has simple structure and convenient operation. There is no mechanical operation part, high efficiency, less energy consumption than other types, but more water consumption, and a certain degree of cleanliness of cooling water is required, otherwise the nozzle is easy to be blocked.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

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vertical oilless reciprocating pump characteristics

The vertical oil-free reciprocating pump is the substitute product of horizontal reciprocating pump. Compared with the horizontal reciprocating pump, it has the following characteristics: high vacuum degree, energy and water saving, vertical arrangement of cylinder, compact structure, convenient maintenance and small floor area; especially, it improves the disadvantages of horizontal reciprocating pump due to the sag of piston weight and uneven friction. 


PTFE piston ring and packing seal ring with good self-lubricating performance are designed for vertical oil-free reciprocating pump, which can reduce the wear of moving parts and is suitable for less oil lubrication or no oil lubrication. In order to improve the reliability of the pump operation, a gear oil pump is set on the non driving side of the crankshaft to force lubrication on the big and small end bearings of the connecting rod.

The service life of piston ring, packing, valve and other key components of oil-free vertical reciprocating pump is 1.5 ~ 2 times of W series reciprocating vacuum pump. The floor area is about 1 / 2 of the horizontal reciprocating pump. The pump is a double acting cylinder. It can be either single-stage pumping (high pumping rate) or double-stage (high vacuum) structure, which is conducive to the modification of the pump to meet the needs of different customers.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

2020年8月17日星期一

reciprocating pump in chemical plant application

The vacuum pumps commonly used in chemical production include reciprocating vacuum pump, water ring vacuum pump and jet pump. The structure of reciprocating vacuum pump and piston compressor are basically the same. 


The characteristic of vacuum pump is high pressure ratio. For example, to achieve 95% vacuum, the nominal absolute pressure of suction is 0.005MPa, while the exhaust pressure is 0.1MPa, and the pressure ratio is 20. Due to the large pressure ratio, the volume occupied by the gas in the residual clearance volume after expansion is very large, which greatly reduces the suction volume and the effective utilization rate of the cylinder is very low.

In order to solve the above problems, several grooves are generally opened on the cylinder wall at both ends of the cylinder, which are longer than the thickness of the piston. When the piston runs to the dead center position, it is used to balance the pressure of the cylinders on both sides of the piston. For example, when the piston runs to the left dead center, the exhaust end of the left cylinder, the residual gas with high pressure in the clearance volume, and the suction end in the right cylinder, the pressure is low. Due to the connection of the groove, the gas pressure in the clearance volume of the left cylinder will decrease. In this way, the volume occupied by the expansion of the residual gas is greatly reduced and the suction capacity is increased when the piston is running in return. The same is true of the piston running to the right dead center.

Reciprocating vacuum pump is suitable for pumping gas without solid particles and corrosive. This kind of vacuum pump is widely used in chemical industry because of its high pumping rate and high vacuum degree.

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Roots Blower Used In Frequency Converter

Special Gas Roots Blower 

Vacuum measurement-vacuum gauge

In vacuum technology, the pressure of isotropic neutral gas is used to express the degree of vacuum. The tool used to measure gas pressure much lower than atmospheric pressure is usually called vacuum gauge or vacuum gauge. Most of the measured gases in the designated space are mixed gases. therefore. Vacuum measurement in the general sense should belong to the full pressure measurement of mixed gas. The vacuum gauge used is also a vacuum gauge that measures the full pressure. 


Vacuum measurement technology also includes gas composition analysis and partial pressure measurement. The former is to specify which kinds of gas components are contained in the residual gas and roughly estimate their respective proportions. The latter refers to the quantitative determination of the partial pressure values ​​of various gas components under conditions that can meet certain accuracy requirements. The instruments used are basically different types of mass spectrometers. They are called residual gas analyzer and partial pressure gauge.

The vacuum gauge currently used. One is to directly calculate the pressure value of the gas from the physical quantity of pressure measured by itself. This is the absolute vacuum gauge. The other is to indirectly reflect the measured gas pressure value through the physical quantity related to the gas pressure. This is the relative vacuum gauge. Because the relative vacuum gauge must pass the calibration of the absolute vacuum gauge to accurately measure the vacuum degree. Therefore, in addition to the measurement of the total pressure and partial pressure of the gas, the vacuum measurement technology should be included. The calibration of the real meter must also be included.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Principle of pumping liquid with water ring pump

When pumping liquid, the process of suction is the same as that of gas. On the left side of the sickle shaped space of the pump (the side of the pressure outlet), the speed of the liquid is increased due to the decrease of the water cross section. 


According to Bernoulli's equation, when the speed increases, the pressure will decrease. When the liquid continues to flow forward and flows to the pressure outlet, the pressure will increase suddenly. As a result, the liquid passing through the pressure outlet will be obstructed and the speed will be slowed down. The sudden increase of pressure and deceleration will bring huge hydraulic loss, so the efficiency of water ring pump in pumping liquid is very low (compared with that of pumping gas) The efficiency is not more than 15 ~ 20%, because of the huge hydraulic loss and the "water conveyor effect" (when the liquid flows to the pressure outlet area, the liquid flows from the place with large radius to the place with small radius, and the liquid transfers its own energy to the impeller, just like the water conveyor), in fact, the head is much smaller. The head of water ring pump is smaller than that of centrifugal pump of the same size.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

2020年8月16日星期日

Vacuum pump for steam turbine

At present, 600MW Steam Turbines at home and abroad mostly adopt the combination of water ring vacuum pump and air ejector. The vacuum pumping system mainly includes sealing device of steam turbine, vacuum pump and corresponding valves, pipelines and other equipment and components. 


The vacuum pumping system of a 600 MW steam turbine unit in a power plant is as follows: the main exhaust pipe of the steam turbine condenser is connected to the air extraction system, and enters the vacuum pump through the valve, the ejector type air extractor and the check valve. In the water ring vacuum pump, the pressure of the gas is increased through the first and second stages of pressing, and then enters the gas water separator together with some sealing water. In the separator, water and gas are separated. Most of the gas is discharged to the atmosphere through the upper exhaust pipe. A small part of the gas enters the nozzle of the air ejector. At the outlet of the nozzle, this part of gas has certain kinetic energy; The water separated by the separator is led out from the lower pipe and sent to the cooler. After cooling, it is returned to the vacuum pump for recycling. 


The vacuum pumping system of the unit is equipped with two 100% water ring vacuum pumps. During start-up, two pumps are put into operation at the same time. In normal operation, one is in operation and the other is in standby.

Customize Roots Blower

Vacuum Gauge Calibration Station

Roots Blower And Turbo Blower Difference Between 

2020年8月14日星期五

Lubrication and maintenance of vacuum pump

The vacuum pump in use will produce more or less friction, we need to constantly lubricate it to keep it in good working condition, and after use, we need to maintain it for a longer time. 


Under normal working conditions, the waste grease and its dirt in the bearing and accessory space should be removed and new grease should be added after the rotating speed is 20000 h or the longest 3 years. The additional grease should account for 50% of the bearing free space and 65% of the bearing cover space. If the working conditions are very bad, the grease change cycle should be shortened accordingly.

1. If hard water is used as working fluid, it can only be used after softening treatment, or the pump can be cleaned with solution within a certain period (in order to avoid abrasion of impeller, pump body or impeller jamming, dust particles entering pump cavity along with gas and working fluid shall be washed through the flushing port at the bottom of pump cover; if hard water is used as working fluid, hard water shall be softened or periodic solvent shall be used to flush vacuum pump )。

2. The temperature of the bearing in normal operation of the motor is 15 ℃ - 20 ℃ higher than the surrounding temperature, and the maximum temperature is not allowed to exceed 55 ℃ - 60 ℃.

3. Always pay attention to check the running state of the vacuum pump and observe whether the rotation of the shaft and bearing is stable. In case of instability or jamming, the relevant parts shall be replaced and repaired immediately.

4. In case of leakage of the mechanical seal used, check whether the dynamic and static rings of the mechanical seal have been damaged, or the seal ring is aging. In case of the above situation, new parts need to be replaced.


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Dry Scroll Vacuum Pump

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Roots vacuum unit operation

The operating safety and stability of Roots vacuum unit is high because the unit has the function of operation protection. Its operation protection function has many, the following vacuum pump to briefly introduce. 


Roots vacuum unit has more than 30 protection functions, including compressor overload, overheating, locked rotor protection; system high pressure, low pressure and differential pressure protection; evaporator water temperature too low protection, evaporator antifreeze protection, condenser water temperature too low protection, abnormal water flow protection.

There are also over-voltage, under voltage, three-phase imbalance, under reverse phase protection for the power supply to the unit from the client; and password protection function to prevent the unit failure caused by the wrong operation of the unauthorized person; at the same time, it has the power on self-test function to avoid the abnormal start-up of the unit; in addition, it has the condenser cleaning reminder function.

These operation protection functions make the use of Roots vacuum unit more convenient and safe. If you want to better use roots vacuum unit, you must do regular inspection and maintenance work to ensure the normal operation of Roots vacuum unit.

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Roots Blowers

Roots Vacuum Pump 

Characteristics of high pumping speed of single stage rotary vane vacuum pump

Single stage rotary vane vacuum pump oil-free (corrosion-resistant) vertical reciprocating vacuum pump is an updated product of horizontal vacuum pump, and is the main equipment to obtain rough vacuum. Due to the full sealing device, the complete isolation between the crankcase and the cylinder is realized, and the self-lubricating material is used for the piston ring, so the advanced oil-free lubrication is realized. Since there is no sewage discharge, this type of vacuum pump is especially suitable for vacuum distillation, vacuum evaporation, vacuum drying, vacuum concentration and vacuum impregnation in chemical, pharmaceutical and food industries. 


During operation, driven by the motor, the piston in the cylinder moves reciprocally through the action of crank connecting rod mechanism (rotation movement changes into linear motion). When the piston moves from the left end to the right end of the cylinder, the volume of the left chamber of the cylinder is increasing, and the pressure of the left chamber space is continuously reduced. When the pressure in the left chamber space is lower than the pressure in the extracted container, according to the principle of gas pressure balance, the gas in the extracted container is continuously pumped into the left cavity through the suction valve 5, which is in the process of suction. When the piston reaches its rightmost position, the left chamber of the cylinder is filled with gas. Then the piston moves from the right end to the left end, and the suction valve 5 automatically closes. The gas is compressed as the piston moves from right to left. When the gas in the cylinder reaches the exhaust pressure, the exhaust valve 4 is opened and the gas is discharged to complete a working cycle. When the piston moves from the left end to the right end, repeat the above cycle until the extracted container reaches a certain equilibrium pressure.

Roots pump with relief valve is widely used in all aspects of vacuum acquisition. It extends the working range of mechanical vacuum pump with oil seal under low inlet pressure. It has the characteristics of small volume and large pumping speed. It has large pumping speed in the range of 1 ~ 100 Pa inlet pressure. It is especially suitable for the vacuum system which needs high pumping speed under low inlet pressure, such as power transformer, power capacitor, power capacitor, etc Vacuum drying, vacuum impregnation treatment, vacuum heat treatment, vacuum smelting exhaust, vacuum coating equipment pre pumping, large test wind tunnel exhaust and lighting lamp production line exhaust.

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2020年8月13日星期四

Usage of centrifugal pump

The basic structure of centrifugal pump is composed of six parts: impeller, pump body, pump shaft, bearing, sealing ring and stuffing box. 


1. Impeller is the core part of centrifugal pump. It has high speed and high output. The blades on the impeller play an important role. The impeller should pass the static balance test before assembly. The inner and outer surface of impeller is required to be smooth to reduce the friction loss of water flow.

2. Pump body also known as pump shell, it is the main body of the pump. It plays a supporting and fixing role and is connected with the bracket for installing the bearing.

3. The function of the pump shaft is to connect the motor with the coupling, and transmit the torque of the motor to the impeller, so it is the main part of transferring mechanical energy.

4. The sliding bearing uses transparent oil as lubricant. Add oil to the oil level line. Too much oil will seep along the pump shaft, too little bearing will overheat and burn out, causing accidents! In the process of pump operation, the temperature of bearing is the highest at 85 degrees, and generally it is about 60 degrees.

5. Sealing ring is also called leakage reducing ring.

6. Stuffing box is mainly composed of packing, water sealing ring, packing barrel, packing gland and water sealing pipe. The function of the stuffing box is mainly to close the gap between the pump shell and the pump shaft, so as not to let the water flow in the pump to the outside, and also to prevent the outside air from entering the pump. Always keep the vacuum in the water pump! When the pump shaft and packing friction heat, rely on the water seal tube to hold water to the water seal ring to cool the packing! Keep the pump running normally. Therefore, in the process of circulating inspection of pump operation, the inspection of stuffing box should be paid special attention to! The packing should be replaced after 600 hours of operation.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Vacuum system of pumping steam

In the process of vacuum impregnation, vacuum drying and vacuum freeze-drying, the gas extracted from the vacuum system is mainly steam and other condensable steam, and the working vacuum degree is mostly 10 ~ 10-1pa. In foreign countries, roots pump and oil seal mechanical pump are usually used for air extraction. For this reason, in recent years, the maximum inlet pressure of water vapor is the index of foreign oil sealed mechanical pumps (usually 103 ~ 3 × 103pa), while the domestic oil sealed mechanical pumps generally do not have this index. Moreover, the check function of some mechanical pumps equipped with air ballast valve is not strong, and the gas ballast effect is not obvious, which can not achieve the purpose of large amount of steam pumping, resulting in a large amount of steam condensation in the pump oil, Oil and water mixed to form white emulsion, reducing the sealing and lubricating performance of mechanical pump. The corrosion liquid will cause rust inside the pump body, and the rusty iron powder will fall into the oil and become reddish brown, and circulate in the pump together with the pump oil, which will have adverse effects on the service life and limit vacuum degree of the pump. 


(1) The steam jet pump is suitable for the vacuum system with large displacement, and the system needs to be equipped with working steam source.

(2) Oil booster pump + oil seal mechanical pump, the system is not suitable for the gas phase drying of transformer, especially in the oil booster pump, the naked electric furnace is strictly used, otherwise the open fire is easy to cause explosion accident.

(3) ZJ Roots pump + ZJ Roots pump + double stage water ring vacuum pump, the pumping system can obtain higher limit vacuum degree and larger displacement. However, the investment cost of the system is high, and it is easy for the working fluid of the water ring pump to flow back into the vacuum container, and the pumping efficiency of the water ring pump is low, and the unit power consumption is 50% higher than that of the slide valve pump. For example, various types of roots water ring vacuum unit.

(4) Slide valve pump + water ring pump or ZJ Roots pump + slide valve pump + water ring pump, because the slide valve pump is equipped with a front stage pump (water ring pump) in the system, so its compression ratio is reduced, so the water vapor is rarely condensed in the slide valve pump, but there is still a defect in Item 3.

(5) ZJ Roots pump + rotary vane vacuum pump is equipped with high-efficiency gas ballast valve, reliable oil-water separator and reasonable design of lubrication system, so that the system can operate continuously at the inlet steam pressure of 3000pa. This is an economical and reliable vacuum system for pumping steam abroad in recent years. For example, various types of rotary disc vacuum unit.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump