Centrifugal pump and dish washing machine

Abstract

The invention discloses a centrifugal pump. The pump comprises a pump head assembly and a motor assembly, the pump head assembly comprises a pump base, a pump cover and an impeller, a pump cavity is defined by the pump base and the pump cover, and the impeller is arranged in the pump cavity; the motor assembly comprises a motor with a rotating shaft and a mechanical seal cover which is used for sealing the motor and is arranged close to the pump base, and the mechanical seal cover and the pump base are arranged separately, so that water in the pump head assembly is volatilized to the outside of the motor assembly; and one end of the rotating shaft sequentially penetrates through the mechanical seal cover and the pump base and is fixedly connected with the impeller, a sealing piece is arranged between the mechanical seal cover and the rotating shaft, the rotating shaft is sleeved with the sealing piece, and the sealing piece and the rotating shaft synchronously rotate, so that water is prevented from permeating into the motor assembly through the rotating shaft, the sealing performance and safety of the centrifugal pump are improved, and the service life of the centrifugal pump is prolonged.

Description

【Technical field】 [0001] The invention relates to a centrifugal pump and a dishwasher. 【Background technique】 [0002] Dishwashers have been gradually applied in household cleaning, which has many advantages such as labor saving and good cleaning effect. A mechanical seal is a shaft sealing device for a rotating machine. It is often used in products such as dishwasher pumps due to its low cost, low leakage and long life. The working principle of the mechanical seal is to rely on a pair or several pairs of end faces perpendicular to the shaft for relative sliding to keep fit under the action of fluid pressure and the elastic force of the compensation mechanism, and to achieve the purpose of leak prevention with auxiliary seals. However, the mechanical seal cannot achieve a complete sealing effect, and there will be a certain amount of leakage of the medium. Since the leaked medium will easily enter the motor, it will lead to intensified corrosion of the pump motor bearings ...

AI Technical Summary

Problems solved by technology

However, the mechanical seal cannot achieve a complete sealing effect, and there will be a certain amount of leakage of the medium.

Since the leaked medium is easy to enter the motor, it will lead to the corrosion of the pump motor bearing and the inner stator and rotor core of the motor, and even cause a short circuit of the pump motor, thus affecting the life of the pump.

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