Sc - vacuum pump selection principle and calculation formula

before choosing vacuum pump, everyone must know something about several important concepts and parameters of vacuum pump.

vacuum: refers to the thin degree of vacuum gas, usually expressed in vacuum. The value of vacuum gauge reading become a vacuum. Vacuum value is the actual value of indicator system pressure below the atmospheric pressure values. Shown in the table are the values of the absolute pressure limit, this is our ultimate vacuum. Vacuum = atmospheres - Absolute pressure ( Atmospheric pressure is commonly 101325 pa) , the limit of water ring vacuum pump vacuum is 3300 pa, rotating blade limiting vacuum of vacuum pump is 200 pa.

limit: absolute pressure of the internal pressure is measured by the absolute pressure than the 'theory of vacuum ( Theory of vacuum pressure to 0 pa) 'How much higher. It is state of object is a theory of absolute vacuum pressure value. Due to process limitation, however we are unable to pull the internal pressure to 0 Pa absolute vacuum. Therefore, by the vacuum pump vacuum value is higher than theory value. Therefore, when expressed in absolute vacuum, no minus sign in front.

: containment swept volume is the vacuum pump suction speed measure. Generally expressed in L/S and m? /H。 It is the rate of leakage compensation parameters. In theory, draw the same volume of the container. Why large pump is easy to get what we want, and the small vacuum pump is difficult to even don't want we want to vacuum? Because a pipe or container must not be absolutely leakage protection. Big pumping capacity has made up caused by leakage of vacuum decline. Therefore, easy to come to the ideal vacuum value. Therefore, we suggest that when calculating the theoretical swept volume you choose a higher level of vacuum pump.

about the choice of the vacuum water pump 1, meet the technological requirements of vacuum pump

vacuum pump working pressure should meet the requirements of process work pressure, when the choice of the vacuum degree should be higher than the vacuum degree of vacuum equipment to half an order of magnitude. Usually, if demands absolute pressure higher than 3300 pa, the water ring vacuum pump as vacuum equipment. If the absolute pressure of less than 3300 pa, cannot choose water ring vacuum pump, and can't choose some rotary vacuum pump or Roots water ring vacuum unit as a vacuum to obtain equipment.

swept volume 2, process, Extraction rate)

need vacuum pump pumping speed ( The vacuum pump under pressure from their work to discharge gas, liquid and solid ability) , general unit for the m3 / h, L/S, m3 / min. The specific calculation method can refer to the following formula to calculate type. Of course, the choice of the vacuum pump is a comprehensive process, involving factors such as the relevant experience.

　　S=( V / t) × ln( P1/P2) 。

among them: S is the vacuum water pump suction rate ( L/s) 。

V is the volume of the vacuum chamber, L) 。

t is the time needed for the vacuum degree required ( s) 。

(P1 is the initial pressure Pa) 。

pressure P2 is required ( Pa) 。

3, make sure to pumping gas composition

a, the objects are pumping gas, liquid or particles. If pumping gas contains impurities, such as water or a small amount of dust particles and please be careful to choose rotary-vane vacuum pump. If the vacuum degree is high, should add a filter. Filter can use rotary vane vacuum pump as vacuum device.

2, it is necessary to know whether the object pumping corrosive ( How much is the acid or alkali, PH value) 吗? If gas is contained in acid or alkali corrosion or organic corrosion factors, should be before choosing rotary vane vacuum pump filter or neutral.

three, pumping object will contaminate rubber or oil? According to the different pumping medium, should choose the corresponding vacuum equipment. If the gas contains a lot of steam, particles and corrosive gas, should consider to the inlet of the pump. Pipeline has been installed on the corresponding auxiliary equipment, such as condenser, filters, etc. ( For more information, please contact our technical engineer.

4, vacuum water pump noise, vibration and beautiful any effects to the factory.

five, as the saying goes, cheap is not good. When purchasing a vacuum pump and vacuum equipment, also should give priority to the quality of the equipment, transportation and its repair and maintenance costs.

to read this article also read the bible water ring vacuum pump common malfunction.

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