Patent ID: 7300263
Filing Date: 2007-11-27
Classification: F04D,F16C

Abstract:
1. A pump conveying a supercritical fluid or a liquid, comprising: a suction-side casing forming a body of the pump and having an inlet through which the supercritical fluid or liquid is supplied into the suction-side casing and an outlet through which the supercritical fluid or liquid having a pressure thereof raised is discharged out of the suction-side casing; an impeller provided inside the suction-side casing and raising the pressure of the supercritical fluid or liquid present between the inlet and outlet of the suction-side casing; a purging-side casing having a purging port through which part of the pumped liquid obtained by sucking in the supercritical fluid or liquid is discharged; an outer cylinder held between the suction-side casing and the purging-side casing; a main shaft provided in a central part of the outer cylinder and connected to the impeller to transmit a rotating force thereto; a first ball bearing supporting the main shaft in the suction-side casing; a second ball bearing supporting the main shaft in the purging-side casing; a stator arranged inside the outer cylinder and having a winding arranged on a stator core formed as projections formed on an inner circumferential surface of a cylindrical core; a rotor arranged inside the stator and arranged on an outer circumferential surface of the main shaft; a stator can provided inside the stator to prevent the part of the pumped liquid from entering the stator; a rotor can provided outside the rotor to prevent the part of the pumped liquid from entering the rotor; a motor mold member filling the inside and outside of the stator, outside of the stator can; a reinforcement sleeve provided to cover an inner circumferential surface and end surfaces of the motor mold member located where the stator does not exist outside the stator can; and an O-ring provided on a surface at which the suction-side and purging-side casings make contact with the stator can.