800KW mine prevention gas leakage-water ring vacuum pump
一． Industry Profile
Water ring vacuum pump in the coal mine industry, coal mine safety issues more and more attention from people, endless accidents continue to occur, requiring a variety of coal mine safety performance strict control, water ring vacuum pump as a coal mine production machinery products, explosion-proof performance of the motor and material has strict requirements, vacuum pump equipment (gas pumping) and its configuration gradually specialized and complete sets, to better meet the needs of the coal industry safety production, efficient, fast, safe is the main direction of future coal mine water ring vacuum pump.
二．Craft description and control requirements
1、Craft description
Water ring vacuum pump in the coal mine industry, water ring pump supporting the design of the gas separator, and the relevant instrumentation of the vacuum-compressor group, to ensure that the gas being pumped gas no leakage.
After starting, the impeller rotates at high speed so that the water in the impeller groove flows to the volute, when a vacuum is formed at the inlet, the inlet backstop opens and the air in the suction pipe enters the pump and reaches the outer edge via the impeller groove.
三． Electrical control diagram
四．Program Features
1. According to the investigation, the gas pumping pump generally operates between 35HZ- 45HZ to meet the demand of working condition operation.The frequency of operation is related to the distance between the incoming coal working face and the tail discharge hole of the catch pump.When the working face advances and picks up the tail discharge hole more into, the running frequency is lower, and vice versa the running frequency is higher.That is to ensure that the gas at the retrieval face does not exceed the limit, the safe working environment of the face is guaranteed, and the fresh air of the work does not enter the goaf to avoid the occurrence of natural fire accidents in the goaf, so that the raw coal production of the retrieval face is greatly improved.
2.
(1) Eliminates the impact of the motor on the equipment due to starting and stopping, extending the service life of the gas pump and the motor.
(2) Limit the impact of the starting current on the grid during startup and reduce the peak power loss during startup.
(3) The reduced operating speed of the gas pump improves the lubrication conditions of the operating parts of the equipment and reduces the failure of the transmission.
3.Frequency conversion and energy saving, the water ring vacuum pump runs 45HZ for a long time, so as to achieve the best operation effect, not only to ensure the efficiency, but also to achieve energy saving.
4. Improve the power factor of the power grid
The rated power factor of the gas pump motor is 0.87, while the inverter can keep the power factor above 0.95, which improves the power quality of the grid, transmission efficiency and reduces electricity expenses.
五．Field Applications
