Pressure control system and method for no-load starting of emulsion pump

Abstract

The invention discloses a pressure control system for no-load starting of an emulsion pump, which comprises a speed reducing motor, a throttle valve, a Hall element, a speed measuring gear and a motor control plate. The speed reducing motor is connected with the throttle valve and used for controlling a rotating angle of the throttle valve and adjusting pressure in an emulsion pipeline. The speed measuring gear is arranged at the coupling position of the throttle valve and the speed reducing motor. The Hall element is used for obtaining information related to the rotating angle of the throttle valve through the speed measuring gear and transmitting the obtained information into the motor control plate in a pulsing mode. The motor control plate is used for adjusting the rotating angle of the throttle valve through the speed reducing motor according to information transmitted by an opening degree measuring unit and related to the rotating angle of the throttle valve and enabling the pressure in the emulsion pipeline to change between a maximum value and a minimum value within a period of fixed time. The no-load starting of the emulsion pump is achieved, and the problems that starting current is large, impact to a power grid is large, power supply return circuit wire diameter is thick and the like when a motor is started under load.

Description

technical field [0001] The invention relates to the field of pressure control of emulsion pumps, in particular to a pressure control system and method for no-load startup of emulsion pumps. Background technique [0002] At present, the emulsion pump station is generally started with load, but when it is started with load, not only the current is large, the path of the power supply circuit is thick, the impact on the power grid is large, but also it is difficult to start, it takes a long time to start, and the pump body of the emulsion pump vibrates Large and heavily worn. There are usually three ways to start the AC motor: 1) direct start; direct start has a large impact on the power grid, and the pump body of the emulsion pump has a large mechanical impact load. 2) Reduced voltage start: Reduced voltage start is not suitable for high power and large load occasions. 3) Frequency conversion start: Although the frequency conversion start can well complete the soft start with...

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Problems solved by technology

[0002] At present, the emulsion pump station is generally started with load, but when it is started with load, not only the current is large, the path of the power supply circuit is thick, the impact on the power grid is large, but also it is difficult to start, it takes a long time to start, and the pump body of the emulsion pump vibrates large, heavily worn

There are usually three ways to start the AC motor: 1) direct start; direct start has a large impact on the power grid, and the pump body of the emulsion pump has a large mechanical impact load

2) Step-down start; step-down start is not suitable for occasions with high power and large loads

3) Frequency conversion start: Although the frequency conversion start can well complete the soft start with a large load, the electronic control equipment of the frequency conversion start is complicated, the operation cost is high, and the floor area is large, so it is not easy to promote and use in coal mines

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