What is a vacuum pump and its selection and application software program

A vacuum pump is a gadget or device that USES mechanical, physical, chemical or physical-chemical methods to pump air away of a pot to obtain a vacuum.Generally speaking, vacuum pump is a device that improves, generates and maintains vacuum in a closed space simply by various means.
According to the operating rule of vacuum pump, vacuum pump may become divided in to two types, namely gas catch pump and gas transfer pump.It is widely used in metallurgy, chemical substance sector, food, electronic finish and additional sectors.

Scenario Of Application:
Although the liquid band pump belongs to the crude vacuum pump, it still has a sizable market in China's petroleum, chemical, electric power, light textile, papermaking, medicine and other fields.Overseas, water ring pump sales accounts for 14% of all vacuum pump marketplace, second just to dry pump, due to the liquid ring pumps are mostly spreading, processing requirements is not high also, belongs to the labor-intensive products, thus the home water ring pump in price competitive benefit, the key is to improve the design, reduced volume, lose excess weight, improve effectiveness, reduce energy intake.
Because of its durability and reliability, sliding valve pumps are used for front-stage pumps in various vacuum furnaces, film plating machines, drying, soaking and other tools in house and abroad.In order to help to make the domestic slide valve pump enter the international marketplace, it is required to additional reduce the vibration noise of the pump, prevent oil injection and oil leakage, and improve the reliability of the slide valve pump in long-term operation.
With the continuous expansion of vacuum technology in various application fields, the demand of dc rotary vane pump is increasing.Because this sort of pump volume is very much, application and assembling workload is extremely big, the price is very low, so some foreign vacuum producer establish special stock in China.Local little and medium measured right league rotary vane pump technically already pass, prices are much cheaper than foreign pump, so home pump has a competitive advantage, the key is to resolve the shaft seal leakage and rotary vane textiles and vacuum pump oil performance quality problems, ensure that right league pump in high speed, high temperature performance is certainly stable and dependable operation, and to additional improve the home straight league rotary vane pumps besides water vapor ability.
Roots pump
Regarding to the production situation of root base pumping systems overseas, many huge foreign businesses, such as Leybold, Balzers, Alcatell, Edwards and ULVAC, every of which accounts pertaining to much less than 5% of the global sales quantity of origins pushes. These five companies just accounts for 20%.At home and overseas almost every large or small, high vacuum and vacuum system, in order to shorten the extraction time, increase the production efficiency are equipped with root base pump, so home root base pump must be based about the occupation of the home market to enter the worldwide market in the additional hand, also considering the power frequency is 60 hz in some countries and regions, more sure Paul, in the case of raising speed pump long-running reliability.
Local air – cooled direct – exhaust air roots pump has produced speedy progress, and the technology has been adult.Since the pump is equipped with a gas cooler under the exhaust slot, some of the cooled gas is returned through the pipe to the pump chamber to cool the rotor, thus balancing the compression heat, the pump can directly drain the atmosphere.In order to meet the requirements of different supreme vacuum degrees, this sort of pump can be used in series. Generally, a gas cooled direct exhaust air flow roots pump is usually added in entrance of the pump, and the greatest vacuum reached is definitely an order of degree higher than the earlier pump.This kind of pump, because there is no working medium in the pump cavity, is actually also a dry pump.This kind of air-cooled direct exhaust air roots pump and its unit have been tested in petroleum, chemical, plastic, pesticide, turbine rotor powerful balance, aerospace space simulation and other devices for a long time, so it should be popularized and applied in China.
Molecular pump
The molecular pump can be used to replace the cryogenic pump in many technological occasions in the semiconductor field abroad.
The exhaust time of the molecular pump is longer than that of the cryogenic pump since the pumping speed of the molecular pump is only one quarter of that of the same caliber cryogenic pump.Overseas in purchase to improve the pumping velocity, on the entrance side of the molecular pump with a – 130 ℃ ~ 150 ℃ low temp cool plate, called molecular pump at low temperature, drinking water vapour is captured simply by the plate in low temperatures, the molecular pump apart additional gases.This kind of low temperature molecular pump is applied to the vacuum coating equipment, which not only enhances the production efficiency but also improves the quality of the film layer.With the quick development of China's semiconductor industry, film industry and scientific study, molecular pump should be the focus of China's vacuum pump production industry.First, a complete series of molecular pushes should be built from little to large to meet the needs of different occasions.
The foreign dry pump market is growing, mainly powered by the rapid advancement of semiconductor industry, chemical industry and film industry.In Japan, the semiconductor industry has changed the oil seal mechanical pump with the dry vacuum pump, and more than 45% of the Euro and American semiconductor industries have changed the oil seal mechanical pump with the dry vacuum pump, greatly enhancing the performance and quality of the items.In order to meet the requirements of different application fields and functioning conditions, there are multistage origins vacuum pump, multi-stage claw vacuum pump, screw vacuum pump, vortex vacuum pump, reciprocating piston vacuum pump and turbine oil free of charge vacuum pump.The ultimate pressure is from 10Pa to 10-2pa, and the pumping speed is from 20m3/h to 500m3/h.
Water ring pump
Drinking water ring vacuum pump (drinking water ring pump) is a kind of primitive vacuum pump. The supreme vacuum it can obtain is certainly 2000~4000Pa, and the series atmosphere ejector can reach 270~670Pa.Drinking water band pump can also be used seeing that compressor, called water ring compressor, is a low pressure compressor, its pressure range is 1~2 * 105Pa pressure meter.
Drinking water ring pushes were originally utilized as self-priming pumps, but have since been utilized in many commercial sectors such as essential oil, chemicals, machinery, mining, light market, medicine and food.Drinking water band pumps are widely utilized in many industrial procedures, such while vacuum purification, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum focus, vacuum moisture come back and vacuum degassing.As a result of the fast advancement of vacuum application technology, water ring pump has been paid much attention in the pay for of crude vacuum.Because the gas compression in water band pump is isothermal, it can take out inflammable and explosive gas, and also can take out the gas containing dust and drinking water. Therefore, the program of drinking water ring pump is normally raising day by day.
As proven in the figure, a average quantity of water is installed in the pump body as working fluid.When the impeller rotates clockwise as demonstrated in the figure, the upper inner surface of the water ring is just in contact with the tip of the blade (in fact, the blade has a specific depth of penetration in the water ring).At this point, a crescent space is formed between the centre of the impeller and the water band, which is divided into several small cavities equal to the number of cutting blades by the impeller.If the bottom of the impeller 0 ° as starting point, so in front of the rotating impeller 180 ° when small cavity volume changes from small to big, and with suction mouth on the face, the gas is inhaled, when the suction at the end of the small cavity is isolated from the rest of inspiratory mouth;When the impeller continues to rotate, the small cavity decreases from large to small, leading to the gas to be pressurized.When the small cavity is connected with the exhaust slot, the gas is dismissed away of the pump.
In conclusion, the water ring pump is definitely a variable volume vacuum pump because of the modification of pump chamber volume to achieve the suction, compression and exhaust.
Likened with additional types of mechanical vacuum pumps, water ring pumps have got the pursuing advantages
The structure is simple, the manufacturing precision is not high, easy to process.
Small framework, high number of pumps, and generally can end up being directly connected with the electric motor, zero decrease device.As a result, with a small structural size, we can obtain a large quantity of exhaust gas and a small area of land.
Compressed gas is basically isothermal, that is normally, compressed gas practice temperature changes very small.
Because generally there is no steel friction surface in the pump cavity, generally there is no need to lubricate the pump, and wear is very small.The sealing between rotating parts and fixed parts can be completed by water seal straight.
Uniform suction, stable and reliable function, simple procedure, easy maintenance.
Drinking water band pump also has its drawbacks:
Low efficiency, generally around 30%, better up to 50%.
The vacuum is low, not only because of structural constraints, but also due to the saturation vapor pressure of the working fluid.Using drinking water since working liquid, the greatest pressure may only reach 2000~4000Pa.Essential oil seeing that working liquid, up to 130Pa.
In a term, because the water ring pump gas compression is isothermal, so can be eliminated inflammable, forceful gas.Since there is no exhaust valve and friction surface area, dust gas, condensable gas and gas-water combination can be removed.With these outstanding features, it has been widely used in spite of its low efficiency.

Model Selection:
The function of vacuum pump is to remove the gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber and make it reach the required vacuum level.Generally speaking, presently there is a big range from the atmosphere to the extremely high vacuum, which has not been covered simply by a vacuum system.Therefore, it is normally required to choose different vacuum system configuration in order to meet the technical specifications, working efficiency and service life requirements of different products and different vacuum sections.In order to achieve ideal configuration, the following points should be considered when deciding on a vacuum system:
Initial of almost all, the vacuum required for each process must end up being checked and determined.Because each process has its suitable vacuum range, it must be properly studied and determined.
Check the limit vacuum degree of the vacuum pump system on the basis of determining the required vacuum level, because the limit vacuum degree of the system decides the top working vacuum degree of the program.Generally speaking, the limit vacuum of the system is 20% lower than the working vacuum of the system, and 50% more affordable than the limit vacuum of the previous stage pump.
Check and determine the type and volume of gas removal required by the procedure.Because if the kind of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated.At the same period, consideration must be given to the determination of the appropriate exhaust time and the amount of gas produced in the practice of extraction.
Check to determine the time required to achieve the required vacuum, the stream level of resistance and loss of the vacuum tube.Consider the removal price required to maintain the vacuum under certain technological conditions after the required vacuum degree is reached.
H = 2.303 (v/t), lg (p1 / p2)
Among them:
H is the removal price of vacuum pump (d/t)
V is the volume of vacuum chamber (l).
Testosterone levels is the period required to achieve the required vacuum level (beds)
G1 is the preliminary pressure in the container
G2 is the pressure in the container after air flow extraction
Elements affecting the
It determines the size of the product, the higher the demand for the amount of surroundings pumped, the larger the volume of the item, the higher the engine power required.
It can be used to determine the structure of the product, the vacuum is there pressure and overall pressure reading.Complete pressure indicates that the reading is certainly total worth, that is normally, the closer the reading is usually to ‘0\', the higher the vacuum level.But in contrast, gage pressure, the more near to 760 MMH ɡ indicates that the vacuum degree is higher, if you requested the total pressure (vacuum) limit is near to the ‘\ 0', so as long as the vacuum pump can meet up with the demand.

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