Pump System

Abstract

A pump system includes: a metallic flow path housing including a suction portion configured to suction a fluid and a discharge portion configured to deliver the suctioned fluid; and a resin motor housing configured to drive a pump rotor existing inside the flow path housing in a state of being fitted and connected to the flow path housing, in which the flow path housing includes a first fitting portion having a cylindrical inner circumferential surface, and a first flange portion in an attitude perpendicular to a center axis that becomes a center of the inner circumferential surface, and the motor housing includes a second fitting portion having a columnar outer circumferential surface and a second flange portion, and on an outer circumferential surface of the second fitting portion, protrusions are formed.

What is claimed is: 
     
         1 . A pump system comprising:
 a metallic flow path housing including a suction portion configured to suction a fluid and a discharge portion configured to deliver the suctioned fluid; and   a resin motor housing configured to drive a pump rotor existing inside the flow path housing in a state of being fitted and connected to the flow path housing,   wherein the flow path housing includes a first fitting portion having a cylindrical inner circumferential surface, and a first flange portion in an attitude perpendicular to a center axis that becomes a center of the inner circumferential surface,   the motor housing includes a second fitting portion having a columnar outer circumferential surface fitted into the first fitting portion and a second flange portion connected to the first flange portion, and on an outer circumferential surface of the second fitting portion, a plurality of protrusions are formed to protrude to a position at which the protrusions have a diameter larger than an inner diameter of the inner circumferential surface of the first fitting portion, and   the first fitting portion and the second fitting portion are connected to each other in a state where a gasket is sandwiched between the first flange portion and the second flange portion.   
     
     
         2 . The pump system according to  claim 1 ,
 wherein the plurality of protrusions are pressed on an inner surface of the first fitting portion in a state where the first fitting portion and the second fitting portion are fitted to each other.   
     
     
         3 . The pump system according to  claim 1 ,
 wherein the second flange portion has a recessed portion formed in a concave shape in a region of a connecting surface thereof that surrounds the protrusion when viewed in a direction along the center axis.   
     
     
         4 . The pump system according to  claim 1 ,
 wherein the protrusions are disposed near a plurality of fastening portions in which the first flange portion and the second flange portion are fastened to each other by a bolt.   
     
     
         5 . A pump system comprising:
 a metallic flow path housing including a suction portion configured to suction a fluid and a discharge portion configured to deliver the suctioned fluid; and   a resin motor housing configured to drive a pump rotor existing inside the flow path housing in a state of being fitted and connected to the flow path housing,   wherein the flow path housing includes a first fitting portion having a cylindrical inner circumferential surface, and a first flange portion in an attitude perpendicular to a center axis that becomes a center of the inner circumferential surface,   the motor housing includes a second fitting portion having a columnar outer circumferential surface fitted into the first fitting portion and a second flange portion connected to the first flange portion, and on an outer circumferential surface of the second fitting portion, a plurality of protrusions are formed to protrude to a position at which the protrusions have a diameter larger than an inner diameter of the inner circumferential surface of the first fitting portion,   the first fitting portion and the second fitting portion are connected to each other in a state where a gasket is sandwiched between the first flange portion and the second flange portion, the plurality of protrusions are pressed on an inner surface of the first fitting portion in a state where the first fitting portion and the second fitting portion are fitted to each other, and   the second flange portion has a recessed portion formed in a concave shape in a region of a connecting surface thereof that surrounds the protrusion when viewed in a direction along the center axis.   
     
     
         6 . A pump system comprising:
 a metallic flow path housing including a suction portion configured to suction a fluid and a discharge portion configured to deliver the suctioned fluid; and   a resin motor housing configured to drive a pump rotor existing inside the flow path housing in a state of being fitted and connected to the flow path housing,   wherein the flow path housing includes a first fitting portion having a cylindrical inner circumferential surface, and a first flange portion in an attitude perpendicular to a center axis that becomes a center of the inner circumferential surface,   the motor housing includes a second fitting portion having a columnar outer circumferential surface fitted into the first fitting portion and a second flange portion connected to the first flange portion, and on an outer circumferential surface of the second fitting portion, a plurality of protrusions are formed to protrude to a position at which the protrusions have a diameter larger than an inner diameter of the inner circumferential surface of the first fitting portion,   the first fitting portion and the second fitting portion are connected to each other in a state where a gasket is sandwiched between the first flange portion and the second flange portion, the plurality of protrusions are pressed on an inner surface of the first fitting portion in a state where the first fitting portion and the second fitting portion are fitted to each other,   the second flange portion has a recessed portion formed in a concave shape in a region of a connecting surface thereof that surrounds the protrusion when viewed in a direction along the center axis, and   the protrusions are disposed near a plurality of fastening portions in which the first flange portion and the second flange portion are fastened to each other by a bolt.