Novel variable pump without thrust bearing

By combining a thrust-free bearing structure with hydraulic drive components, the problems of friction loss and low flow regulation accuracy in traditional variable pumps are solved, achieving more efficient flow control and dynamic response, and improving pump performance.

CN224187753UActive Publication Date: 2026-05-01HUNAN M&W ENERGY SAVING TECH & SCI CO LTD
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Patent Information

Application Number
CN202520934582.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-13
Publication Date
2026-05-01
Estimated Expiration
2035-05-13

AI Technical Summary

Technical Problem

In traditional variable displacement pumps, the impeller supports the rotation of the main shaft through a thrust bearing, which leads to frictional losses and bearing wear. Furthermore, the axial clearance cannot be adjusted in real time, resulting in low flow regulation accuracy and pressure fluctuations.

Method used

It adopts a thrust-free bearing structure, which uses the sliding between the bushing and the main shaft to replace direct sliding friction. The relative position of the bushing and the impeller is controlled by hydraulic drive components to realize the axial displacement of the impeller and flow regulation, thereby reducing friction and improving dynamic response capability.

Benefits of technology

It reduces frictional losses during impeller rotation, improves flow regulation accuracy and dynamic response capability, avoids bearing wear, and enhances pump efficiency and stability.

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Abstract

The novel variable pump comprises a pump shell, and a liquid inlet cavity and a liquid outlet cavity are formed in the two opposite sides of the pump shell respectively. The main shaft is rotationally connected to one side of the pump shell, one end of the main shaft is in transmission connection with a driving part, the main shaft is in key connection with a shaft sleeve, and a sliding stroke allowing the shaft sleeve to slide is formed on the main shaft; the impellers comprise the left impeller fixedly connected to one end of the shaft sleeve and the right impeller fixedly connected to the main shaft, and the left impeller and the right impeller are staggered to define an adjusting cavity; the sliding between the shaft sleeve and the main shaft is used for replacing the existing direct sliding between the bearing and the main shaft, and the left impeller is directly fixed on the shaft sleeve, so that the left impeller does not bear the axial thrust generated during rotation, and meanwhile, the bearing acting on the impeller can be prevented from directly rubbing with the main shaft; and the influence on variable control of the pump body due to transverse movement caused by abrasion of the bearing is avoided.
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