Single-stage centrifugal pump capable of achieving self balance of axial force

Abstract

The invention discloses a single-stage centrifugal pump capable of achieving self balance of axial force. The single-stage centrifugal pump comprises a pump body, an impeller assembly, a pump shaft and a shaft sleeve. One end of the pump shaft extends into the pump body. The pump shaft is in sealing connection with the pump body through the shaft sleeve. The pump shaft is in clearance fit with the shaft sleeve. The impeller assembly is installed at the tail end, extending into the pump body, of the pump shaft and is in clearance fit with an impeller installation cavity inside the pump body. The impeller assembly comprises an impeller, a front impeller cover plate and a rear impeller cover plate. The impeller is installed in a cavity which is defined by the front impeller cover plate and the rear impeller cover plate. A circle of rear impeller ring which is coaxial with the impeller is arranged on the outer surface of the rear impeller cover plate. The inner diameter of the rear impeller ring of the rear impeller cover plate is greater than the outer diameter of a front impeller ring of the front impeller cover plate. Grooves are formed in the outer surface of the rear impeller ring. The single-stage centrifugal pump has the beneficial effects that internal flow of the impeller is stable; vibration of the centrifugal pump is reduced; the reliability and efficiency of the centrifugal pump are improved; the axial force balance effect is effectively improved; generation of the cavitation phenomenon can be inhibited through a jet hole of the pump shaft.

Description

technical field [0001] The invention relates to a single-stage centrifugal pump capable of realizing axial force self-balancing. Background technique [0002] Centrifugal pumps are one of the most widely used general-purpose equipment in life. They are simple in structure, easy to use, and high in efficiency. However, during operation, due to the difference in pressure between the front and rear cover plates of the impeller, the axial force of the centrifugal pump is generated, and the direction of the axial force points to the impeller inlet. The unbalanced axial force will increase the working load of the bearing, which is not good for the bearing. The axial force will cause the pump rotor to move towards the suction port, causing vibration and possibly causing the friction of the impeller mouth ring to damage the pump body. At the same time, the axial force causes the bearing to move toward the suction port, causing the wear of the impeller and the pump casing mouth ring...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem of excessive axial force in the single-stage centrifugal pump, and secondly, to solve the problem of hydraulic loss and alleviate cavitation in the gap between the front and rear cover plates of the impeller and the pump body, the present invention proposes a A single-stage centrifugal pump capable of self-balancing axial force

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