| 摘要 |
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.
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