A kind of multistage centrifugal pump

Abstract

The invention discloses a multi-stage centrifugal pump and belongs to the technical field of fluid pumps. The centrifugal pump comprises a pump body, a transmission shaft is rotatably mounted in the pump body which comprises a pumping-in section, an intermediate section and a pumping-out section, the intermediate section is arranged between the pumping-in section and the pumping-out section, a plurality of impellers are fixedly mounted on the transmission shaft, guide blades corresponding to the impellers are arranged on the intermediate section, a pumping-in seal mechanism is arranged between the pumping-in section and the transmission shaft, a pumping-out seal mechanism is arranged between the pumping-out section and the transmission section, an air filtering plate is arranged between the pumping-in section and a primary impeller and is fixedly mounted on the pump body, a plurality of through holes are formed in the air filtering plate, a wheel disc is fixedly mounted on the transmission shaft, blades are arranged on the wheel disc, the pumping-out section is fixedly connected with a compensating shell, and a compensating seal mechanism used for preventing fluid from leaking is arranged between the compensating shell and the transmission shaft. The multi-stage centrifugal pump solves the technical problems of poor sealing performance, proneness to air binding formation and low pumping out efficiency of an existing multistage centrifugal pump and is widely applied to continuous fluid delivering.

Description

technical field [0001] The invention relates to a pump, in particular to a multistage centrifugal pump, which belongs to the technical field of fluid pumps. Background technique [0002] The centrifugal pump works by rotating the impeller to cause the water to undergo centrifugal motion. Its working principle is: when the liquid enters the pump casing, due to the gradual expansion of the flow channel in the volute-shaped pump casing, the flow rate of the liquid gradually decreases, and a part of the kinetic energy is transformed into Static pressure energy, so the liquid flows out along the discharge port at a higher pressure. At the same time, a certain vacuum is formed at the center of the impeller due to the liquid being thrown out, and the pressure Pa at the liquid surface is higher than that at the center of the impeller. Therefore, the liquid in the suction line enters the pump under the action of the pressure difference, the impeller rotates continuously, and the liq...

AI Technical Summary

Problems solved by technology

[0007] Specifically, the technical problem to be solved by the present invention is: to provide a multi-stage centrifugal pump to solve the current technical problems of multi-stage centrifugal pumps with poor sealing performance, easy formation of air binding, and low output efficiency

Images