Drainage pump and washing machine with same

Abstract

The invention discloses a drainage pump and a washing machine with the same. The drainage pump includes a pump shell, a piston assembly, an impeller and a driving device, wherein the pump shell is internally provided with a drainage cavity, and a water inlet and a water outlet which are communicated with the drainage cavity are formed in the pump shell; the piston assembly is movably arranged on the pump shell, and an air storage cavity which is communicated with the drainage cavity and has a variable volume is defined on the pump shell by the piston assembly; the impeller is rotatablely arranged in the drainage cavity; the driving device is installed on the pump shell and in transmission connection with the impeller. According to the drainage pump, by arranging the piston assembly, and adopting the piston assembly and the pump shell to define the air storage cavity with the variable volume, the piston assembly can move according to the work conditions of the drainage pump, therefore,the capacity of the air storage cavity can be increased or decreased, it is ensured that water flow can be normally sucked and discharged, the problem of air trapping is effectively solved, and then the work efficiency of the drainage pump is improved.

Description

technical field [0001] The invention relates to the technical field of washing machines, and more specifically, to a drain pump and a washing machine having the same. Background technique [0002] The washing machine in the related art uses an upward drainage pump for drainage. The drainage pump often has air trapping phenomenon, that is, there is a certain amount of air in the impeller cavity, and the rotation of the impeller cannot discharge the water in the cavity out of the cavity, resulting in the drainage pump not being able to drain normally. . Therefore, a need for improvement exists. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a drainage pump, which does not have air trapping when it works. [0004] The present invention also proposes a washing machine with the above-mentioned drain pump. [0005] The drainage pump accord...

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Problems solved by technology

[0002] The washing machine in the related art uses an upward drainage pump for drainage. The drainage pump often has air trapping phenomenon, that is, there is a certain amount of air in the impeller cavity, and the rotation of the impeller cannot discharge the water in the cavity out of the cavity, resulting in the drainage pump not being able to drain normally.

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