Pump having heat-dissipating mechanism

Abstract

A pump includes a DC motor ( 10 ) defining a chamber ( 108 ) and having a rotor ( 112 ) and a shaft ( 110 ) suitably received in the chamber, a motor shell ( 20 ) set around the DC motor, a rear cover assembly ( 30 ) jointed to the motor shell, a front cover assembly ( 40 ) secured to the rear cover assembly, and a check valve assembly ( 50 ) and a diaphragm assembly ( 60 ) set between the front cover assembly and the rear cover assembly. The DC motor defines a number of air inlets ( 116 ) and air outlets ( 118 ) at two side walls ( 104, 106 ) thereof, respectively. The shaft is equipped with a rotatable fan ( 10 ). The motor shell has a number of ventilation holes ( 200 ) in communication with the air outlets. The rear cover assembly defines a number of through-holes ( 300 ) communicated to the air inlets. The through-holes, the air inlets, the chamber, the air outlets and the ventilation holes jointly define an air flow path. In operation, the fan rotates around the shaft and forcibly circulates the air from the through-holes and the air inlets out of the chamber via the air outlets and the ventilation holes.

1 . A pump comprising:
 a DC motor comprising a plurality of side walls cooperatively defining a chamber, and a rotor and a shaft suitably received in the chamber, the side walls being provided with a plurality of air inlets and air outlets, and the shaft being equipped with a rotatable fan;   a motor shell set around the DC motor, the motor shell defining a plurality of ventilation holes in communication with the air outlets;   a rear cover assembly securely coupled to the motor shell, the rear cover assembly having a plurality of through-holes communicated to the air inlets;   a front cover assembly secured to the rear cover assembly; and   a check valve assembly and a diaphragm assembly set between the front cover assembly and the rear cover assembly;   wherein the through-holes, the air inlets, the chamber, the air outlets and the ventilation holes jointly define an airflow path, and   during operation of the pump, the fan rotates around the shaft and forcibly circulates the air from the through-holes and the air inlets out of the chamber via the air outlets and the ventilation holes.   
     
     
         2 . The pump as described in  claim 1 , wherein the DC motor comprises a front wall and a rear wall opposite to each other, the air inlets are defined in the front wall and the air outlets are disposed in the rear wall. 
     
     
         3 . The pump as described in  claim 2 , wherein the fan is situated adjacent to the front wall of the DC motor. 
     
     
         4 . The pump as described in  claim 2 , wherein the fan is located adjacent to the rear wall of the DC motor. 
     
     
         5 . The pump as described in  claim 1 , wherein the through-holes are situated at a lower surface of the rear wall assembly and in communication with the air inlets defined in the DC motor. 
     
     
         6 . The pump as described in  claim 1 , wherein the pump further comprises a pressure switch assembled to the front cover assembly thereof. 
     
     
         7 . The pump as described in  claim 1 , wherein the diaphragm assembly comprises a bracket and a diaphragm detachably coupled to each other. 
     
     
         8 . The pump as described in  claim 7 , wherein the diaphragm is coupled to the bracket via a plurality of screws. 
     
     
         9 . The pump as described in  claim 1 , wherein the fan has an outer diameter compliant to an inner diameter of the chamber. 
     
     
         10 . The pump as described in  claim 1 , wherein the fan is detachably coupled to the shaft.