Screw pump flow feedback speed regulating system

Abstract

The invention discloses a screw pump flow feedback speed regulating system which comprises an adjustable speed motor of a screw pump and also comprises a controller connected with the adjustable speed motor, and the controller is also connected with an outlet flow sensor and an alarm device; in the system, a closed-loop control system is formed with the adjustable speed motor as an executor, the outlet flow sensor as a sensor and the controller as a controller, the aim of the system is control of flow of the screw pump by controlling the rotating speed of the adjustable speed motor, and the problems that the flow of the screw pump can fluctuate sometimes due to variation of liquid viscosity when the screw pump is adopted for sucking and discharging liquid and the screw pump is hard to operate when stable flow is required are solved. The screw pump flow feedback speed regulating system disclosed by the invention has the advantages that the feedback control system is adopted, stable output flow of the screw pump is guaranteed, and the screw pump flow feedback speed regulating system has multiple self-checking functions and high stability.

Description

technical field [0001] The invention relates to a screw pump control system, in particular to a screw pump flow feedback speed regulation system. Background technique [0002] The screw pump is a rotary pump that relies on the volume change and movement of the meshing space formed by the pump body and the screw to deliver or pressurize the liquid. Screw pumps are divided into single screw pumps, twin screw pumps and triple screw pumps according to the number of screws. When the active screw rotates, it drives the driven screw engaged with it to rotate together, the volume of the screw engagement space at one end of the suction chamber increases gradually, and the pressure decreases. The liquid enters the meshing space volume under the action of the pressure difference. When the volume increases to the maximum and a sealed cavity is formed, the liquid moves axially in each sealed cavity until it is discharged from one end of the cavity. At this time, the volume of the scre...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that when a screw pump is used for suction and discharge of liquid, sometimes the flow of the screw pump fluctuates due to changes in the viscosity of the liquid, and it is difficult to use when a stable flow is required. Speed ​​system to solve the problem of controlling the flow stability of the screw pump

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