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, a motor, and an impeller. The motor includes a stator and a rotor. The impeller is fixedly connected to the shaft so as to always synchronously rotate along with the rotary shaft. The stator windings drag the rotor to rotate only in a fixed starting direction during a starting phase of the motor.

1 . A pump comprising:
 a pump housing having a pump chamber;   an inlet and an outlet in communication with the pump chamber;   a synchronous motor comprising a stator and a permanent magnetic rotor rotatable relative to the stator, wherein the rotor comprises a shaft and a magnet fixed to the shaft, the stator comprises a stator core and stator windings wound around the stator core and powered by an alternating current power supply, wherein each time the motor is powered up, the permanent magnetic rotor has a fixed starting direction and rotates at a constant speed of 60 f/p RPM during a steady state, where f is the frequency of the alternating current power supply, and p is the number of pole pairs of the permanent magnetic rotor; and   an impeller disposed in the pump chamber and fixedly connected to the shaft so as to always synchronously rotate along with the shaft   wherein the stator windings drag the rotor to rotate only in the fixed starting direction during a starting phase of the synchronous motor.   
     
     
         2 . The pump of  claim 1 , wherein the impeller comprises a substrate and a plurality of curved blades mounted to the substrate spacedly in a circumferential direction. 
     
     
         3 . The pump of  claim 1 , wherein the impeller comprises a substrate, and a group of long curved blades and a group of short curved blades mounted to the substrate spacedly in a circumferential direction. 
     
     
         4 . The pump of  claim 1 , wherein a mounting post is disposed at a central area of the substrate, one end of the shaft is fixed to the mounting post via a shaft sleeve, and the mounting post, the shaft sleeve and an injection molding portion at an inner side of the shaft sleeve cooperatively form a continuous closed end surface at an axial end of the mounting post away from the motor. 
     
     
         5 . The pump of  claim 1 , wherein the pump housing includes a cover body and a bottom plate mounted to the cover body, and the bottom plate includes a pump chamber bottom wall having an opening, and a rotor housing extending integrally axially and outwardly from the opening. 
     
     
         6 . The pump of  claim 5 , wherein an end cap is fixed in one end of the rotor housing adjacent the opening, and opposite ends of the shaft are respectively supported by a first bearing disposed in the end cap and a second bearing disposed at another end of the rotor housing away from the opening. 
     
     
         7 . The pump of  claim 6 , wherein the first bearing is mounted to the end cap via a shock absorber. 
     
     
         8 . The pump of  claim 7 , wherein the first bearing is cylindrical in shape and includes a ridge extending circumferentially on an outer surface of the first bearing, and an inner surface of the shock absorber forms a groove for engaging with the ridge. 
     
     
         9 . The pump of  claim 6 , wherein the second bearing is supported by a bearing seat integrally formed with the rotor housing, and a plurality of teeth is formed on an inner surface of the bearing seat. 
     
     
         10 . The pump of  claim 1 , wherein opposite ends of the shaft are respectively supported by two bearings, the two bearings are supported by two support members, and at least one of the two bearings is in non-continuous contact with a corresponding one of the support members along a circumferential direction. 
     
     
         11 . A pump comprising:
 a pump housing having a pump chamber;   an inlet and an outlet in communication with the pump chamber;   a motor comprising a stator and a rotor rotatable relative to the stator; and   an impeller disposed in the pump chamber and fixedly connected to a shaft of the rotor so as to always synchronously rotate along with the shaft;   wherein the stator windings drag the rotor to rotate only in a fixed starting direction during a starting phase of the motor.   
     
     
         12 . 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 11 .