Variable frequency speed regulation control method and control device of pump

Abstract

The invention provides a variable frequency speed regulation control method and control device of a pump. According to the method, the output rotating speed of a frequency converter is controlled through the torque of a driving motor, so that the output flow of the plunger-kind pump is controlled, the speed of the frequency converter is reduced under the condition that the flow meets the application requirement, so that energy conservation and consumption reduction are achieved, abrasion during the period is reduced, and the service life of the pump is prolonged.

Description

technical field [0001] The invention belongs to the technical field of frequency conversion speed regulation control of pumps, and in particular relates to a pump frequency conversion speed regulation control method and a control device. Background technique [0002] Plunger pumps are widely used in the industrial field. In the coal mining industry, the emulsion pump stations and spray pump stations used in coal mining face are all plunger pumps. [0003] When the traditional plunger pump is working, it is directly driven by a power frequency motor. There is a pressure regulating valve (unloading valve) on the pump body. When the output pressure of the pump is greater than the unloading pressure, the unloading valve will act. In the pump body, the pump works in an ineffective state, which wastes electric energy and increases the wear and tear of the pump, reducing the service life of the pump. [0004] With the development of frequency conversion technology, the frequency c...

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Problems solved by technology

[0007] 1. It is necessary to increase the pressure sensor detection link, which increases equipment investment;

[0008] 2. When the pressure sensor fails, the frequency conversion speed regulation cannot be realized, and the meaning of the frequency conversion drive pump is lost;

[0010] 4. Due to the working characteristics of the plunger pump, when the required flow rate increases, the output pressure will decrease instantaneously, but the output speed of the frequency converter will not increase instantaneously, and the output pressure of the pump will be lower than the field demand during the acceleration time of the frequency converter. The lowest value, resulting in slow movement of hydraulically driven equipment, such as hydraulic supports, which affects work efficiency

Not recognized by field operators, which affects the application and promotion of variable frequency drive pumps

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