Pump device

Abstract

A pump device includes: a rotor unit that exerts a pumping action on fluid; a housing for defining a suction port, a discharge port, and a storage chamber that stores the rotor unit; and a rotary shaft that is combined with the rotor unit and protrudes outside the housing and that rotates about a predetermined axis line. The housing includes: a bottomed cylindrical housing body integrally having a joint wall that is joined to an application object, an outer peripheral wall that defines the storage chamber in cooperation with the joint wall, and a spigot joint part that protrudes from the joint wall in the axis line direction and that is fitted to the application object; and a plate-like housing cover that is combined with the housing body in order to close the storage chamber.

1 . A pump device, comprising:
 a rotor unit, exerting a pumping action on a fluid;   a housing, defining a suction port, a discharge port, and a storage chamber that stores the rotor unit; and   a rotary shaft, coupled to the rotor unit, protruding outside the housing, and rotating about a predetermined axis line, wherein   the housing comprises a housing body of a bottomed cylindrical shape and a housing cover of a flat plate shape, the housing body integrally comprising a joint wall that is joined to an application object, an outer peripheral wall that defines the storage chamber in cooperation with the joint wall, and a spigot joint part that protrudes outward in a direction of the axis line from the joint wall and is fitted to the application object, the housing cover being coupled to the housing body to close the storage chamber.   
     
     
         2 . The pump device according to  claim 1 , wherein
 a thickness dimension of the joint wall is smaller than a thickness dimension of the outer peripheral wall.   
     
     
         3 . The pump device according to  claim 1 , wherein
 the suction port and the discharge port are provided in the joint wall around the spigot joint part.   
     
     
         4 . The pump device according to  claim 1 , wherein
 the housing body and the housing cover each comprise a plurality of insertion holes each allowing a bolt to be inserted therethrough to be fixed to the application object; and   the outer peripheral wall is formed to have a larger thickness dimension in a peripheral area of the insertion hole than in other areas.   
     
     
         5 . The pump device according to  claim 1 , wherein
 a thickness dimension of the housing cover is larger than a thickness dimension of the joint wall and smaller than a thickness dimension of the outer peripheral wall.   
     
     
         6 . The pump device according to  claim 1 , wherein
 the housing body comprises inside the spigot joint part a first bearing hole rotatably supporting one end area of the rotary shaft; and   the housing cover comprises a second bearing hole rotatably supporting the other end area of the rotary shaft.   
     
     
         7 . The pump device according to  claim 6 , wherein
 the housing cover comprises an annular protrusion protruding outward in the direction of the axis line around the second bearing hole.   
     
     
         8 . The pump device according to  claim 1 , wherein
 the housing cover comprises a fitting protrusion fitted to a fitting recess of the housing body.   
     
     
         9 . The pump device according to  claim 8 , wherein
 the fitting recess is formed as a portion of an inner edge defining the storage chamber.   
     
     
         10 . The pump device according to  claim 1 , wherein
 the housing body comprises a screw hole into which a screw is screwed;   the housing cover comprises a circular hole through which the screw passes; and   the housing cover is coupled to the housing body by the screw.   
     
     
         11 . The pump device according to  claim 1 , wherein
 the rotor unit comprises an inner rotor rotating integrally with the rotary shaft and an outer rotor rotating in conjunction with the inner rotor.