Liquid draining pump and household appliance with pump

Abstract

The invention provides a liquid draining pump. The pump comprises a motor chamber; a motor with a driving shaft is arranged in the motor chamber, and an impeller is arranged on the driving shaft; an axial clearance is formed between a front end cover of the motor chamber and the impeller, and an annular groove is formed in the front end cover of the motor chamber; and impeller annular protrusions extending towards the annular groove are arranged on the impeller. Due to a matched structure between the impeller annular protrusions and the annular groove, when the liquid draining pump works, the impeller rotates at high speed in liquid, and hair and particulate matter or fibers and the like in the liquid are not likely to pass through a channel formed by the matched structure of the impeller annular protrusions and the annular groove under driving of rotation of the impeller, and enter the axial clearance between the front end cover of the motor chamber and the impeller to be stacked or wound on the driving shaft, and therefore normal high-speed rotating of the driving shaft is obstructed, and capacity of liquid draining of the pump is affected.

Description

technical field [0001] The invention relates to a pump for discharging liquid, especially a drainage pump. [0002] The invention also relates to a domestic appliance, in particular a dishwasher or a washing machine, having a pump as described above. Background technique [0003] In the traditional structure of the existing discharge liquid pump, the drive shaft and the rotor of the motor rotate in the rotor chamber, while the impeller of the pump rotates in the hydraulic chamber. The specific structure can be found in European patent application EP2455614A2. The liquid discharged from the pump, such as the washing water of the dishwasher or washing machine, is generally not clean, and there will always be some hair, particles or fibers mixed in the water. There is a certain gap between the impeller mounted on the drive shaft and the front end of the motor chamber to ensure the impeller rotates freely. During the working process of the pump, the impeller rotates at a high ...

AI Technical Summary

Problems solved by technology

During the working process of the pump, the impeller rotates at a high speed in the hydraulic chamber to discharge the liquid, and the hair, particles or fibers in the liquid are driven by the rotation of the impeller and enter the above gap and accumulate or wrap around the rotating shaft, thus hindering the normal operation of the rotating shaft. High-speed rotation affects the drainage capacity of the pump

Images