JP2011026983A5 - - Google Patents

Claims (6)

  A motor, an impeller fixed to one end of an output shaft of the motor, a motor chamber in which the motor is accommodated, and an impeller chamber in which the impeller is accommodated and which serves as a flow path for fluid transferred by rotation of the impeller And a seal member that contacts the output shaft and prevents the intrusion of fluid from the impeller chamber into the motor chamber, and the output by the contact between the inner wall of the impeller chamber and the impeller A pump device characterized in that movement of the shaft in the axial direction is restricted.   The impeller includes a blade portion and a cylindrical portion protruding from the blade portion to the opposite output side, and the output shaft is fixed to a shaft fixing hole formed in the cylindrical portion,
  The movement of the output shaft in the axial direction is restricted by contact between an inner wall of the impeller chamber and a counter-output end surface that is an end surface on the counter-output side of the cylindrical portion. The pump device described.   The impeller chamber is composed of a case body and an impeller case.
  The case body includes a convex portion that protrudes in a cylindrical shape from the center of the bottom surface of the motor chamber, and the cylindrical portion is located in a concave space born in the impeller chamber by the convex portion,
  The non-output side end surface of the cylindrical portion is opposed to the bottom of the concave space with a predetermined clearance,
  The pump device according to claim 2, wherein movement of the output shaft in the axial direction is restricted by contact between a bottom portion of the concave space and a counter-output end face of the cylindrical portion. The stator of the motor is molded with resin, and the seal member is fixed to a recess formed in the resin portion, and the opening of the recess is partially or entirely covered by the outer wall of the impeller chamber. The pump device according to claim 3 , wherein the pump device is provided.   The pump device according to claim 4, wherein the convex portion closes the opening of the concave portion by entering and positioning in the concave portion. Within the case, the pump device according to the fluid discharged from said impeller chamber to claims 1 to 5, characterized in that the gas-liquid separating chamber is provided for separating the liquid and gas.