Vacuum pump vendors tell you what is the difference between the roots vacuum pump and the backing pump -

roots water ring vacuum unit function is closely related to the functions of roots pump, and the functions of roots pump changes with the backing pump. Here are vacuum pump manufacturers tell you what is the difference between the roots vacuum pump and the backing water pump.

1) Because of roots pump rotor and between the rotor and clearance between rotor and shell, so will produce reflux, even if the input pressure is the same as the inlet pressure, reflux can also under the influence of inlet pressure and outlet pressure. Roots pump when using different backing pump, pumping speed will be different.

extraction yield of roots pump can be determined by the following formula:

the delta delta of = 0 ( P2/P1/K)

type: delta 0 design pumping speed;

P1 inlet pressure;

P2 outlet pressure;

inherent constant K, by the shape of the pump rotor, air gap, the rotor rotational speed and the outlet pressure.

from the type, the swept volume is affected by the ratio of the outlet pressure and inlet pressure, that is to say, if the backing pump suction speed increase, the extraction of roots pump speed will also increase.

( 2) Extreme pressure by the pumping speed of the pump, each clearance flow back, leakage of pump body and high vacuum side releasing gas quantity. This is:

P0 = ( Q1 + +第三季) / delta type: P0 - Extreme pressure;

δ- Exhaust rate;

Q1 return flow;

Q2 - Leakage;

Q3 ventilation.

in these parameters, Q1 much affected by the exhaust pressure, exhaust pressure is the limit of the backing pump pressure. When will be used as the backing pump water ring pump, roots pump's ultimate pressure will change along with the saturated vapor pressure of water ring. But not the same.

before the ultimate vacuum pump is higher, the higher limiting vacuum of the unit. Finally a roots pump pump) Gradually expanding, function curve, that is, the application scope has been broadened ( By comparing the curve 1 and 2, and 3 and 5) 。

the curve of unit 1, 2, about the same. Also, the curve of unit 3, 4, 5 is the same. But, 1, 2 unit curve and 3, 4, 5 units is a completely different set of curves. This suggests that, for the same roots pump, when using different backing pump, the function curve of the unit will be significantly different. You can see that the backing pump has a considerable effect on the function of the unit.

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