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Marking method for energy saving discussion of liquid ring vacuum pump
The energy-saving research of liquid ring vacuum pump is a trend of the future research of Chinese scholars. It is an urgent need for many enterprises in the country to discuss useful energy efficiency labeling methods. There are many ways to indicate the efficiency of liquid ring vacuum pump, such as unit power pumping method, unit gas consumption power method, power value method and so on.
1. Indication of air extraction per unit power
When the pumping capacity per unit power is selected to indicate the energy efficiency of the liquid ring vacuum pump, the calculation formula is (1), where KQ is the pumping capacity per unit power of the pump under a certain inlet pressure, in m3 / (kW · h); QIS is the air capacity at the pump inlet under the inlet pressure, in m3 / h; Wa is the shaft power under the inlet pressure, in kW.
2. Indication method of unit gas consumption power
When the unit gas consumption power is selected to indicate the energy efficiency of the liquid ring vacuum pump, the calculation formula is where kW is the unit gas consumption power of the pump under a certain inlet pressure, and the unit is (kW. H) / m3. According to formula (1) and formula (2), KQ and kW are reciprocal.
3. Power value indication method
The power value indication method is the ratio of gas isothermal contraction power to total consumption power indicated by percentage.
In general, the temperature rise of gas from the inlet to the outlet is 2 ~ 5 ℃ by liquid ring vacuum pump. Therefore, the process of pumping gas by liquid ring vacuum pump can be isothermal. The isothermal tightening power (pump power) of the liquid ring vacuum pump is where wis is the isothermal tightening power of the pump at the inlet pressure, unit: kW. Meanwhile, the calculation formula of the isothermal tightening power wis is where P1 is the certain pressure at the inlet of the pump, unit: kPa; P2 is the certain pressure at the outlet of the pump, unit: kPa.
Through the above three energy efficiency marking methods, it can be very accurate to determine which aspect of liquid ring vacuum pump needs energy saving, and it has great significance for the development of vacuum pump in the future.
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