Track type movable blade stepless variable frequency pump

Abstract

The invention discloses a track type movable blade stepless variable frequency pump. The variable frequency pump comprises a bottom end cover (1), a pump case (2), bearings (3 and 8), a blade positioning plate (4), a pump shaft (5), a movable blade (6), a rotor (7), a mechanical seal (9), an upper end cover (10) and an inline flange (11). The volumetric efficiency of the pump can be maintained at92% or higher under the condition of increasing outlet pressure, the flow volume ratio of a pump body is increased, and the technical problems that the volumetric efficiency of impeller type variablefrequency pumps is rapidly reduced with the increase of the outlet pressure and is low under the conditions of low frequency working condition and small pump body volume are solved; and the mechanismrunning resistance is low, operation is smooth, the mechanical life can be prolonged, the variable frequency pump is simple in structure and easy to machine, manufacture and mount, and the productionand manufacturing cost can be reduced.

Description

technical field [0001] The present invention relates to fluid machinery, especially to the field of pumps, and more specifically, to a track-type movable vane stepless variable-frequency pump that is used in various non-rated working conditions to transport liquid working medium by frequency conversion. Background technique [0002] Now all volumetric pumps can realize stepless frequency conversion, but due to the existing mature application of volumetric pump technology is limited by the complex structure, resulting in a very small flow volume ratio, compared with centrifugal pump technology products, the existing mature application of volumetric pump technology The flow volume ratio of the product is only equivalent to 1 / 10-1 / 100 of the flow volume ratio of the centrifugal pump technology product. Therefore, the existing stepless frequency conversion pump generally adopts the centrifugal impeller pump technology, and its structure is generally divided into three parts, the...

AI Technical Summary

Problems solved by technology

The existing frequency conversion pump realizes the suction and discharge of liquid through the centrifugal force of the impeller. The faster the speed, the greater the centrifugal force, and the longer the liquid flows through the curved surface of the impeller, the greater the centrifugal force. Therefore, when the impeller speed decreases, the centrifugal force also decreases. ; The stroke of the liquid flowing through the curved surface of the impeller is shortened, and the centrifugal force is also reduced accordingly. Therefore, the efficiency of the existing variable frequency pump will drop rapidly under low frequency speed conditions, and the smaller the design volume, the lower the efficiency of the pump

Moreover, due to the assembly requirements of the existing frequency conversion pump, there must be enough gaps between the volute and the impeller, and the volumetric efficiency will drop rapidly when the outlet pressure rises, and the impeller is also easily damaged by cavitation, resulting in rapid pump efficiency. decline

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