Motor rotor for water pump, water pump, and pool circulation system

Abstract

A motor rotor for a water pump, a water pump, and a pool circulation system are provided. The motor rotor comprises a hollow rotatable shaft having a first injection-molded part, and a magnet disposed circumferentially around a portion of the first injection-molded part. The first injection-molded part extends through an entire axial length of the magnet. The motor rotor also comprises an impeller integrally formed with the first injection-molded part, the impeller being located at an axial end of the hollow rotatable shaft. The motor rotor further comprises a shaft sleeve having a tubular shape located in the hollow rotatable shaft and extending substantially the entire axial length of the hollow rotatable shaft. The water pump has a simple structure, is easy to assemble, is less prone to generating noise during operation, and has a long service life.

What is claimed is: 
     
         1 . A motor rotor for a water pump, comprising:
 a hollow rotatable shaft having a first injection-molded part;   a magnet having an axial length and being disposed circumferentially around a portion of the first injection-molded part, wherein the portion of the first injection-molded part extends through the entire axial length of the magnet; and   an impeller integrally formed with the first injection-molded part, said impeller being located at an axial end of the hollow rotatable shaft.   
     
     
         2 . The motor rotor for a water pump of  claim 1 , wherein the motor rotor further comprises a shaft sleeve having a tubular shape, wherein the shaft sleeve is located in the hollow rotatable shaft at the axial end thereof. 
     
     
         3 . The motor rotor for a water pump of  claim 1 , wherein the motor rotor further comprises two shaft sleeves, wherein each shaft sleeve has a tubular shape, with one of the two shaft sleeves being located in the hollow rotatable shaft at the axial end thereof and the other of the two shaft sleeves being located in the hollow rotatable shaft at an opposing axial end thereof. 
     
     
         4 . The motor rotor for a water pump of  claim 1 , wherein the motor rotor further comprises a shaft sleeve having a tubular shape, wherein the shaft sleeve is located in the hollow rotatable shaft and extends for a distance comprising at least half of the entire axial length of the hollow rotatable shaft. 
     
     
         5 . The motor rotor for a water pump of  claim 4 , wherein the shaft sleeve extends substantially the entire axial length of the hollow rotatable shaft. 
     
     
         6 . The motor rotor for a water pump of  claim 1 , wherein the hollow rotatable shaft further comprises:
 a second injection-molded part extending around the first injection-molded part and over part of an axial length of the first injection-molded part, wherein the second injection-molded part cooperates with the first injection-molded part to fixedly clamp the magnet between the first injection-molded part and the second injection-molded part.   
     
     
         7 . The motor rotor for a water pump of  claim 6 , wherein the motor rotor further comprises two shaft sleeves, wherein each shaft sleeve has a tubular shape, with one of the two shaft sleeves being located in the hollow rotatable shaft at the axial end thereof and the other of the two shaft sleeves being located in the hollow rotatable shaft at an opposing axial end thereof. 
     
     
         8 . The motor rotor for a water pump of  claim 6 , wherein the motor rotor further comprises a shaft sleeve having a tubular shape, wherein the shaft sleeve is located in the hollow rotatable shaft and extends for a distance comprising at least half of the entire axial length of the hollow rotatable shaft. 
     
     
         9 . The motor rotor for a water pump of  claim 8 , wherein the shaft sleeve extends substantially the entire axial length of the hollow rotatable shaft. 
     
     
         10 . A water pump, comprising a housing, which comprises a first chamber and a second chamber, with a fixing rod being provided in the first chamber, wherein the water pump further comprises:
 the motor rotor of  claim 1 , wherein the hollow rotatable shaft of the motor rotor is mounted in the first chamber by being sheathed on the fixing rod;   a pump cover defining a water inlet, a water outlet, and a mounting flange configured to engage a mounting end face of the housing to confine a drainage chamber accommodating the impeller; and   a motor stator located in the second chamber, wherein the motor stator generates a magnetic field which passes through a pump wall between the first chamber and the second chamber to drive the motor rotor.   
     
     
         11 . The water pump of  claim 10 , wherein the pump cover has a recess to receive an end, passing through the drainage chamber, of the fixing rod; and the water pump further comprises a sealing cap located in the recess and covering the end of the fixing rod. 
     
     
         12 . The water pump of  claim 11 , wherein the water pump further comprises a wear pad which is sheathed on the fixing rod and is located between the sealing cap and the motor rotor. 
     
     
         13 . The water pump of  claim 10 , wherein the mounting end face of the housing has an annular groove which faces the mounting flange of the pump cover, and the water pump further comprises a seal ring which is provided in the annular groove and is attached to the mounting flange. 
     
     
         14 . The water pump of  claim 10 , wherein the motor stator comprises a winding bobbin provided in the second chamber, a silicon steel sheet provided on the winding bobbin, and an insulating sheet provided on the silicon steel sheet. 
     
     
         15 . A water pump, comprising a housing, which comprises a first chamber and a second chamber, with a fixing rod being provided in the first chamber, wherein the water pump further comprises:
 the motor rotor of  claim 6 , wherein the hollow rotatable shaft of the motor rotor is mounted in the first chamber by being sheathed on the fixing rod;   a pump cover defining a water inlet, a water outlet, and a mounting flange configured to engage a mounting end face of the housing to confine a drainage chamber accommodating the impeller; and   a motor stator located in the second chamber, wherein the motor stator generates a magnetic field which passes through a pump wall between the first chamber and the second chamber to drive the motor rotor.   
     
     
         16 . The water pump of  claim 15 , wherein the pump cover has a recess to receive an end, passing through the drainage chamber, of the fixing rod; and the water pump further comprises a sealing cap located in the recess and covering the end of the fixing rod. 
     
     
         17 . The water pump of  claim 16 , wherein the water pump further comprises a wear pad which is sheathed on the fixing rod and is located between the sealing cap and the motor rotor. 
     
     
         18 . The water pump of  claim 15 , wherein the mounting end face of the housing has an annular groove which faces the mounting flange of the pump cover, and the water pump further comprises a seal ring which is provided in the annular groove and is attached to the mounting flange. 
     
     
         19 . The water pump of  claim 15 , wherein the motor stator comprises a winding bobbin provided in the second chamber, a silicon steel sheet provided on the winding bobbin, and an insulating sheet provided on the silicon steel sheet. 
     
     
         20 . A pool circulation system, comprising:
 the water pump of  claim 10 ;   a water inlet pipeline configured to provide fluid communication between a water injection region of a pool and the water inlet of the water pump;   a heater having a water inlet in fluid communication with the water outlet of the water pump; and   a water outlet pipeline in fluid communication between a water outlet of the heater and the water injection region of the pool.