Centrifugal pump with impeller rotation boosting structure

Abstract

The invention provides a centrifugal pump with an impeller rotation boosting structure, the centrifugal pump comprises a motor, a pump body, an impeller, and a front end cover and a rear end cover at the front and rear sides of the impeller, the impeller is provided with a rear seal ring, the rear end cover is provided with a seal baffle ring which extends toward the impeller and covers at the periphery of the rear seal ring, a seal cavity is formed between the seal baffle ring of the rear end cover and the rear seal ring of the impeller, and the rear seal ring is provided with a plurality of slip sheets capable of slipping into the seal cavity. Compared with the prior art, through adopting the improved design of the end cover and the impeller of the centrifugal pump and utilizing the improved structures (such as the seal cavity and the slip sheets) between the seal baffle ring and the rear seal ring, pressure difference between a high pressure area and a low pressure area at two ends of the seal cavity is converted into power for pushing the impeller to rotate during the rotation of the impeller, so that the torque output of the motor is reduced.

Description

technical field [0001] The invention relates to the technical field of centrifugal pumps, in particular to a centrifugal pump with an impeller rotation assist structure. Background technique [0002] When the traditional centrifugal pump is running, the impeller rotates at high speed in the pump casing. When the pressure areas of the front and rear cover plates of the impeller are different, an axial force will be generated. If the axial force is too large, the motor bearing will heat up. In general, the force bearing area of ​​the impeller front cover a is smaller than the force bearing area of ​​the impeller rear cover b, please refer to figure 1 As shown, this will generate an axial force pointing to the inlet of the impeller c. In order to reduce the imbalance of the axial force, an impeller rear orifice ring q is generally made on the back of the impeller. The diameter of the rear orifice ring q is the same as the diameter of the impeller front orifice ring p , so that...

AI Technical Summary

Problems solved by technology

The low-pressure fluid in the sealing ring flows back to the inlet of the impeller through the balance hole. In this way, the axial force on the front and rear cover plates of the impeller is kept in balance. There is a large pressure difference, but this part of the energy has not been effectively used, and cannot help the rotation of the impeller

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