Drain pump and washing machine with same

Abstract

The invention discloses a drainage pump and a washing machine having the same. The drainage pump includes a pump casing, the pump casing has a drainage cavity therein, and the pump casing is provided with a water inlet and an outlet connected to the drainage cavity. A water outlet; a piston assembly movably disposed on the pump casing and defining a variable-volume air storage cavity on the pump casing that communicates with the drainage cavity; the impeller is rotatably The driving device is installed in the drainage cavity, and the driving device is installed in the pump casing and is drivingly connected with the impeller. According to the drainage pump of the embodiment of the present invention, a piston assembly is provided, and the piston assembly and the pump casing are used to define a variable-volume storage chamber, so that the piston assembly can move according to the working condition of the drainage pump, thereby increasing or reducing the storage capacity. The volume of the air cavity ensures that the water flow can be normally sucked in and discharged, which effectively solves the problem of trapped air, thereby improving the working efficiency of the drainage pump.

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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