Motor-integrated pump and washing apparatus using the same

摘要

A first suction port communicates with one open side of a stator, and an outlet communicates with the other open side of the stator. A rotor fixed to forward and reverse rotatable rotation shaft is contained inside the stator. The rotor has a spiral flow channel on its outer peripheral surface to suck fluid from the first suction port and discharge the fluid to the outlet along with forward rotation. A pump chamber surrounding the rotation shaft and communicating with a second suction port and a discharge port, is provided on one open side of the stator. An impeller to suck the fluid from the second suction port and discharge the fluid to the discharge port along with the forward rotation is fixed in the rotation shaft inside the pump chamber. The impeller comprises a first pressing surface to press the fluid in the pump chamber in the same direction as the thrust load acting on the rotation shaft along with the forward rotation of the rotor. Depressing the fluid with the first pressing surface offsets the thrust load acting on the rotation shaft and in this way reduces wear on the bearings of the rotation shaft.