Pump And Cleaning Apparatus

Abstract

A pump and a cleaning apparatus are provided. The pump includes a pump housing having a pump chamber, an inlet and an outlet in communication with the pump chamber, an impeller rotatably disposed in the pump chamber, and a motor for driving the impeller. The motor includes a stator, a rotor rotatable relative to the stator, and a motor cover body fixed to the pump housing. The motor cover body includes a sidewall connected to the pump housing, the pump housing includes at least one pair of positioning protrusions, and the sidewall is inserted between the pair of positioning protrusions.

1 . A pump comprising a pump housing having a pump chamber, an inlet and an outlet in communication with the pump chamber, an impeller rotatably disposed in the pump chamber, and a motor for driving the impeller, wherein the motor includes a stator, a rotor rotatable relative to the stator, and a motor cover body fixed to the pump housing, the motor cover body includes a sidewall connected to the pump housing, the pump housing includes at least one pair of positioning protrusions, and the sidewall is inserted between the pair of positioning protrusions. 
     
     
         2 . The pump of  claim 1 , wherein a width between the pair of positioning protrusions gradually decreases from free ends to roots of the positioning protrusions, such that the pressure applied to the sidewall gradually increases. 
     
     
         3 . The pump of  claim 2 , wherein two positioning surfaces of the pair of positioning protrusions are offset to each other. 
     
     
         4 . The pump of  claim 1 , wherein snap locking structure is formed between the sidewall and the pump housing. 
     
     
         5 . The pump of  claim 1 , wherein the pump housing comprises a cover body and a bottom plate mounted to the cover body, a resilient arm is formed at an outer circumferential edge of the bottom plate and extends obliquely upwardly, the resilient arm has a free end with a step recessed downwardly with respect to a body of the resilient arm, and a block is formed on an outer circumferential surface of the cover body and engages with the step in the circumferential direction to limit relative circumferential movement between the cover body and the bottom plate. 
     
     
         6 . The pump of  claim 5 , wherein snap locking structure is formed between the cover body and the bottom plate, and the snap locking structures are snappingly locked with each other by relative circumferential rotation between the bottom plate and the cover body. 
     
     
         7 . The pump of  claim 1 , wherein the pump housing comprises a cover body, a bottom plate mounted to the cover body, and a sealing ring for hermetically connecting the cover body to the bottom plate, and the sealing ring is positioned in a radial groove of the bottom plate. 
     
     
         8 . The pump of  claim 1 , wherein the stator comprises a stator core and stator windings wound around the stator core, the stator core comprises a pair of opposing poles and a yoke connected between the poles, the pump housing comprises a cover body and a bottom plate mounted to the cover body, the bottom plate includes a rotor housing extending integrally axially and outwardly from an opening, the rotor housing is fixed between the pair of poles, and the rotor is rotatably supported within the rotor housing. 
     
     
         9 . The pump of  claim 8 , wherein the motor further includes a circuit board fixed to the stator, the circuit board includes a position sensor installed thereon for detecting position of the rotor magnetic poles, and the position sensor is disposed outside the rotor housing. 
     
     
         10 . The pump of  claim 8 , wherein the circuit board further includes a drive circuit, the drive circuit is configured such that, based on magnetic pole position detected by the position sensor, the stator windings are energized in a predetermined manner to ensure that the rotor has a fixed startup direction each time the motor is powered on. 
     
     
         11 . A cleaning apparatus comprising a cleaning chamber, a water supply passage for supplying cleaning water to the cleaning chamber, a drain passage for drainage of water, and a drain pump for pumping the cleaning water in the cleaning chamber to the drain passage, wherein the drain pump comprises the features of the pump in accordance with  claim 1 .