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

A is a device or device that USES mechanical, physical, chemical or physical-chemical strategies to pump atmosphere out of a container to get a vacuum.Generally speaking, vacuum pump is a device that improves, generates and maintains vacuum in a closed space simply by various means.
Regarding to the working process of vacuum pump, vacuum pump may end up being divided into two types, namely gas catch pump and gas transfer pump.It is widely used in metallurgy, chemical substance sector, meals, electronic coating and various other industries.

Circumstance Of Software:
Although the liquid ring pump belongs to the crude vacuum pump, it still has a large marketplace in China's petroleum, chemical, electric power, light textile, papermaking, medicine and other fields.Abroad, liquid band pump sales account for 14% of all vacuum pump market, second just to dry out pump, due to the liquid band pumps are mostly casting, refinement requirements is not high also, belongs to the labor-intensive items, thus the national liquid ring pump on cost competitive advantage, the key is to enhance the design, reduced quantity, lose pounds, improve effectiveness, reduce energy intake.
Because of its strength and reliability, sliding valve pumps are used for front-stage pumps in various vacuum furnaces, film plating devices, drying, soaking and other tools in house and overseas.In order to help to make the local slide valve pump enter the international market, it is required to additional reduce the vibration noise of the pump, prevent oil injection and oil leakage, and enhance the reliability of the slide valve pump in long-term operation.
With the continuous growth of vacuum technology in various application fields, the demand of dc rotary vane pump is increasing.Because this type of pump quantity is extremely much, developing and assembling workload is extremely big, the cost is very low, so some foreign vacuum manufacturer establish special manufacturer in China.National little and moderate sized straight league rotary vane pump technically already complete, prices are far cheaper than foreign pump, so local pump has a competitive advantage, the crucial is to solve the shaft seal leakage and rotary vane materials and vacuum pump oil performance quality problems, make sure that right league pump in high speed, high temperature performance is normally steady and reliable operation, and also to further improve the domestic right league rotary vane pumps besides water vapor ability.
Roots pump
Relating to the production scenario of origins pushes abroad, many huge foreign businesses, this kind of as Leybold, Balzers, Alcatell, Edwards and ULVAC, each of which accounts designed for much less than 5% of the global product sales volume of roots pushes. These five businesses only accounts for 20%.At house and abroad nearly every huge or little, high vacuum and vacuum program, in order to shorten the extraction period, increase the production efficiency are equipped with origins pump, so national roots pump must be based about the occupation of the local marketplace to enter the worldwide marketplace on the other hand, also considering the power frequency is 60 hz in some countries and regions, even more sure Paul, in the case of raising speed pump long-running reliability.
Local air – cooled down direct – exhaust air roots pump has produced speedy progress, and the technology has been older.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 match the requirements of different ultimate vacuum degrees, this sort of pump can be utilized in series. Generally, a gas cooled immediate exhaust air origins pump is added in front side of the pump, and the supreme vacuum reached is definitely an purchase of degree higher than the prior pump.This kind of pump, because there is no working moderate 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 gadgets for a long time, so it should be popularized and applied in China.
Molecular pump
The molecular pump is used to replace the cryogenic pump in many technological occasions in the semiconductor field overseas.
The exhaust time of the molecular pump is longer than that of the cryogenic pump because the pumping speed of the molecular pump is only one quarter of that of the same caliber cryogenic pump.Overseas in purchase to enhance the pumping speed, about the access side of the molecular pump with a – 130 ℃ ~ 150 ℃ low temperature cool plate, called molecular pump in low heat, water vapor is captured simply by the plate in low temperatures, the molecular pump aside various other gas.This kind of low temperature molecular pump is applied to the vacuum coating equipment, which not only boosts the production efficiency but also boosts the quality of the film layer.With the fast 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 up with the needs of different occasions.
The foreign dried out pump market is growing, mainly driven by the rapid development 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 Western european 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 match the requirements of different application fields and functioning conditions, there are multistage root base vacuum pump, multi-stage claw vacuum pump, , vortex vacuum pump, reciprocating piston vacuum pump and turbine oil free 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
Water band vacuum pump (water band pump) is a kind of primitive vacuum pump. The best vacuum it can get is certainly 2000~4000Pa, and the series atmosphere ejector can reach 270~670Pa.Drinking water band pump may also be used as compressor, called water ring compressor, is a low pressure compressor, its pressure range is 1~2 * 105Pa pressure meter.
Water ring pumps were originally utilized seeing that self-priming pumps, but have since been used in many commercial industries such as oil, chemicals, machinery, mining, light market, medicine and meals.Water ring pushes are widely utilized in many commercial processes, such seeing that vacuum purification, vacuum drinking water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture come back and vacuum degassing.As a result of the quick advancement of vacuum application technology, water band pump has been paid much attention in the acquisition of crude vacuum.Because the gas compression in drinking water ring pump is isothermal, it can take out inflammable and explosive gas, and also can take out the gas containing dust and drinking water. Consequently, the application of water band pump is usually increasing time by day.
As demonstrated in the figure, a moderate quantity of drinking water is installed in the pump body as working fluid.When the impeller rotates clockwise simply because shown in the figure, the upper inner surface of the water ring is simply in get in touch with with the tip of the blade (in fact, the blade has a specific depth of penetration in the water ring).At this stage, a crescent space is formed between the hub of the impeller and the water ring, which is divided into several small cavities equal to the amount of blades by the impeller.If the bottom of the impeller 0 ° as starting stage, so in front of the rotating impeller 180 ° when small cavity volume changes from small to big, and with suction mouth area 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 area;When the impeller continues to rotate, the small cavity decreases from large to small, leading to the gas to be pressurized.When the little cavity is connected with the wear out slot, the gas is dismissed away of the pump.
In conclusion, the water band pump is definitely a adjustable volume vacuum pump because of the switch of pump chamber volume to achieve the suction, compression and exhaust.
Likened with various other types of mechanised vacuum pumps, water ring pumps possess the following advantages
The structure is simple, the production precision is not high, easy to process.
Small framework, high amount of pumps, and generally can be directly connected with the engine, zero decrease gadget.Therefore, with a small structural size, we can obtain a huge amount of exhaust gas and a small area of land.
Pressurized gas is certainly basically isothermal, that is usually, compressed gas process temperature shifts very little.
Because now there is zero metal friction surface area in the pump cavity, presently there is no need to lubricate the pump, and wear is extremely small.The sealing between rotating parts and fixed parts can be completed by water seal directly.
Uniform suction, steady and reliable function, basic operation, easy maintenance.
Drinking water band pump also has its drawbacks:
Low efficiency, generally about 30%, better up to 50%.
The vacuum is low, not only because of structural constraints, but also because of the saturation vapor pressure of the working fluid.Using drinking water because functioning fluid, the ultimate pressure may just reach 2000~4000Pa.Oil seeing that functioning fluid, up to 130Pa.
In a phrase, because the water band pump gas compression is isothermal, so can be eliminated inflammable, forceful gas.Since generally there is no exhaust valve and friction What is a vacuum pump and its selection and application software program the filtration 1323145 340surface, dust gas, condensable gas and gas-water mix 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 degree.Generally speaking, presently there is a huge range from the atmosphere to the incredibly high vacuum, which has not really been covered simply by a vacuum system.As a result, it is usually necessary to choose different vacuum system configuration in purchase 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 subsequent points should be considered when deciding on a vacuum system:
Initial of most, the vacuum required for each procedure must be checked and determined.Because each process has its suitable vacuum range, it must be thoroughly studied and determined.
Verify the limit vacuum degree of the vacuum pump program on the basis of identifying the required vacuum degree, since the limit vacuum degree of the program decides the preferred operating vacuum degree of the program.Generally speaking, the limit vacuum of the system is 20% more affordable than the working vacuum of the system, and 50% lower than the limit vacuum of the previous stage pump.
Verify and determine the type and volume of gas extraction required by the procedure.Because if the kind of gas getting pumped reacts with the liquid in the pump, the pump program will be contaminated.At the same time, consideration must be given to the determination of the appropriate exhaust time and the amount of gas produced in the approach of extraction.
Verify to determine the time required to achieve the required vacuum, the circulation resistance and loss of the vacuum tube.Consider the removal price needed to preserve the vacuum under certain technological conditions after the needed vacuum level is reached.
S = 2.303 (v/t), lg (p1 / p2)
Among them:
T is the removal price of vacuum pump (d/s i9000)
Sixth is v is the volume of vacuum chamber (d).
T is the time required to achieve the required vacuum level (t)
G1 is the preliminary pressure in the container
G2 is the pressure in the pot after air extraction
Elements affecting the
It determines the size of the item, the higher the demand for the amount of air flow pumped, the larger the volume of the product, the higher the electric motor power required.
It is utilized to determine the framework of the product, the vacuum is there pressure and overall pressure reading.Overall pressure indicates that the reading is certainly total worth, that is normally, the closer the reading is normally to ‘0\', the higher the vacuum degree.But in contrast, gage pressure, the more close to 760 MMH ɡ indicates that the vacuum degree is higher, if you requested the complete pressure (vacuum) limit is near to the ‘\ 0', thus as long as the vacuum pump can meet up with the demand.

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