Vacuum pump performance parameters and the use of
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1, the ultimate pressure of the vacuum pump
The pump's ultimate pressure unit is Pa, which means that the pump is fitted with a standard test hood at the inlet and is operating at the specified conditions and tends to a steady minimum pressure without the introduction of normal gas service.
2, vacuum pumping speed
Pump pumping speed unit is m3 / s or l / s, is the pump equipped with a standard test cover, and the provisions of the working conditions, the flow of gas flow through the test cover and the test hood at a specified position measured equilibrium pressure Ratio. Pump pumping speed.
3, the amount of vacuum pumping
Vacuum pump pumping unit is Pa m3 / s or Pa l / s. It refers to the pump inlet gas flow.
4, the starting pressure of the vacuum pump
Vacuum pump starting pressure unit Pa, which refers to the pump start without damage and the pressure of the exhaust effect.
5, the pressure before the pump
The pressure unit of the front stage of the vacuum pump is Pa, which means the outlet pressure of the vacuum pump whose discharge pressure is lower than one atmosphere.
6, the maximum pressure before the vacuum pump
The maximum pressure in the front of the vacuum pump port is Pa, which means more pressure than the previous one that can damage the pump.
7, the maximum working pressure of the vacuum pump
Vacuum pump maximum working pressure unit is Pa, it refers to the maximum amount of suction inlet pressure. Under this pressure, the pump can work continuously without deterioration or damage.
8, compression ratio
The compression ratio is the ratio of the pump outlet pressure to the inlet pressure for a given gas.
9, Ho coefficient
The ratio of the actual pumping speed on the pumping channel area to the theoretical pumping speed calculated on the basis of molecular effusion.
10, pumping speed coefficient
The actual pumping speed of the pump is calculated as the ratio of theoretical pumping speed calculated by molecular diathermy at the pump inlet.
11, reflux rate
Pump backflow rate unit is g / cm2.s. It refers to the pump when the required conditions work, through the pump inlet unit area pump flow mass flow rate.
12, the amount of water vapor allowed
Water vapor allowable unit is kg / h, it refers to the pump under normal ambient conditions, the gas pump can be removed in continuous operation of the water vapor mass flow.
13, the maximum allowable steam inlet pressure
The maximum allowable water vapor inlet pressure unit is Pa. It refers to the maximum inlet pressure of water vapor that can be extracted by the gas-operated pump under continuous operation under normal environmental conditions.
Second, the use of vacuum pumps
As a variety of vacuum pumps have a working pressure range and starting pressure are different, so the choice of vacuum pump must meet these requirements.
