Axial force balancing device of multistage pump

Abstract

The invention relates to the technical field of multistage pumps, in particular to an axial force balancing device of the multistage pump. The axial force balancing device of the multistage pump is provided with a pump body, a pump shaft, and impellers and is characterized in that a balance disc seat and a balance disc are sleeved on the pump shaft, the inner wall of the balance disc is fixedly connected with the pump shaft, the outer wall of the balance disc is connected with the balance disc seat in a movable mode, and one end of the balance disc is connected with impellers. Besides, the balance disc seat is fixedly connected with the back section of the pump body so as to enable a fluid gap to be formed between the balance disc and the balance disc seat. When fluid passes the fluid gap between the balance disc seat and the balance disc, due to the relative motion between the balance disc and the balance disc seat, a water ring is formed in the fluid gap so as to reach the effect of dynamic seal and cause fluid pressure drop, the pressure which is formed on an lower cavity of the balance disc is larger than pressure of an upper cavity, most axial force generated by impellers is balanced, and therefore the axial force balancing device of the multistage pump has the advantages that service life of the pump is prolonged, structure is reasonable, running is stable, the axial force is balanced, service life of a bearing is long, work time of the pump is prolonged and the like.

Description

technical field [0001] The invention relates to the technical field of multistage pumps, in particular to an axial force balance device of a multistage pump. Background technique [0002] When the impeller in the existing multi-stage pump rotates at high speed driven by the motor, the liquid filled in the cavity of the impeller is thrown from the center of the impeller to the periphery of the impeller along the flow path between the blades under the action of centrifugal force. Under the thrust of the blades, the pressure and speed increase at the same time, and are led to the impeller of the upper stage through the flow channels between the unit elements. In this way, it flows through all the impellers and flow channels successively, further increasing the pressure energy of the liquid. Increase, after superimposing each impeller step by step, a certain head is obtained. When the pump head is high, the axial force generated by the multi-stage pump impeller is very large. E...

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Problems solved by technology

[0002] When the impeller in the existing multi-stage pump rotates at high speed driven by the motor, the liquid filled in the cavity of the impeller is thrown from the center of the impeller to the periphery of the impeller along the flow path between the blades under the action of centrifugal force. Under the thrust of the blades, the pressure and speed increase at the same time, and are led to the impeller of the upper stage through the flow channels between the individual elements. In this way, it flows through all the impellers and flow channels successively, further increasing the pressure energy of the liquid. Increase, after superimposing each impeller step by step, a certain head is obtained. When the pump head is high, the axial force generated by the multi-stage pump impeller is very large. Excessive axial force has very high requirements on the bearing and reduces the bearing capacity. life, resulting in bearings requiring periodic replacement

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