Flow regulating device for backflow type centrifugal water pump

Abstract

The invention discloses a flow regulating device for a backflow type centrifugal water pump. The output end of the centrifugal water pump is connected with a first tee joint through a pipeline; the first tee joint is connected with a first flow regulating valve through a pipeline; the first flow regulating valve is connected with a second check valve through a pipeline; the first tee joint is connected with a second flow regulating valve through a pipeline; the second flow regulating valve is connected with a second tee joint through a pipeline; and the second tee joint is respectively connected with a water source and the centrifugal water pump through a pipeline. The invention has the advantages that: steplesss regulation of output flow and pressure is realized in a mode of partial backflow of a pump opening, and backflow water flow is circulated inside the water pump, so that the water pump operates at a position close to the optimal operating point, and the loss of water power is reduced; energy carried by the water pump is fed back to an inlet of the water pump through a water head, so that the power of an input shaft of the water pump is substantially reduced, and the electric energy consumption of the water pump is finally reduced during operation; and the device has a simple structure and low cost.

Description

technical field [0001] The invention relates to an output flow and pressure regulating device of a centrifugal water pump, and a backflow centrifugal water pump flow regulating device which uses the backflow size to control the output flow and pressure of the water pump. Background technique [0002] Centrifugal pumps are widely used in various industries. In the design of pump systems, for the sake of safety, pumps with slightly larger flow and lift than the actual working conditions are generally selected, and then the flow and pressure regulating devices are used to make them work at the required level. working condition. In order to realize the stepless adjustment of the output flow and pressure, the throttle valve throttling adjustment or the motor with the frequency converter variable speed adjustment is generally used at present. The throttling adjustment is convenient and reliable, but it is accompanied by a large energy waste, which is very surprising for a large w...

AI Technical Summary

Problems solved by technology

The initial investment cost of frequency converter adjustment is relatively large for larger water pumps. For example, the investment of the frequency converter system equipped with the above-mentioned large water pump motors must be more than one million yuan.

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