Compressor with electric motor

Abstract

A compressor includes an electric motor, a rotating shaft configured to be driven by the electric motor, an impeller attached to the rotating shaft and configured to compress the fluid supplied, a turbine attached to the rotating shaft, a fluid intake port of the impeller, a first flow path forming member including a first flow path guiding a part of the fluid compressed by the impeller to the turbine, and a second flow path forming member including a second flow path guiding the fluid after acting on the turbine to the fluid intake port.

What is claimed is: 
     
         1 . A compressor comprising:
 an electric motor;   a rotating shaft configured to be driven by the electric motor;   an impeller attached to the rotating shaft and configured to compress a fluid supplied;   a turbine attached to the rotating shaft;   a fluid intake port of the impeller;   a first flow path forming member including a first flow path guiding a part of the fluid compressed by the impeller to the turbine; and   a second flow path forming member including a second flow path guiding the fluid after acting on the turbine to the fluid intake port.   
     
     
         2 . The compressor according to  claim 1 , wherein the second flow path forming member houses the impeller and the turbine. 
     
     
         3 . The compressor according to  claim 1 , wherein the electric motor is located in the second flow path. 
     
     
         4 . The compressor according to  claim 1 , wherein the electric motor and the rotating shaft are located in the second flow path. 
     
     
         5 . The compressor according to  claim 1 , wherein the second flow path is located between the turbine and the impeller, and extends along the rotating shaft. 
     
     
         6 . The compressor according to  claim 1 , further comprising a turbine outlet of the turbine,
 wherein the second flow path is fluidly coupled with the turbine outlet and the fluid intake port.   
     
     
         7 . The compressor according to  claim 6 , wherein the second flow path is located between the turbine outlet and the fluid intake port in an axial direction of the rotating shaft. 
     
     
         8 . The compressor according to  claim 6 , wherein the second flow path forming member includes an introduction flow path fluidly coupled with the second flow path at a position adjacent to the turbine outlet. 
     
     
         9 . The compressor according to  claim 1 , further comprising a valve located in the first flow path forming member and configured to adjust a flow rate of the fluid flowing in the first flow path. 
     
     
         10 . The compressor according to  claim 9 , further comprising:
 a temperature acquisition sensor configured to acquire a motor temperature of the electric motor; and   a valve control configured to control the valve based on the motor temperature acquired by the temperature acquisition sensor.   
     
     
         11 . The compressor according to  claim 10 ,
 wherein the temperature acquisition sensor is configured to acquire a first motor temperature of the electric motor, and a second motor temperature of the electric motor, which is higher than the first motor temperature, and   wherein the valve control controls the valve such that when the motor temperature is at the second motor temperature, the flow rate of the fluid flowing in the first flow path is greater than the flow rate when the motor temperature is at the first motor temperature.   
     
     
         12 . The compressor according to  claim 1 , wherein the second flow path forming member includes a third flow path guiding the fluid supplied from outside to the fluid intake port of the impeller. 
     
     
         13 . The compressor according to  claim 12 , wherein the second flow path and the third flow path extend in an axial direction of the rotating shaft. 
     
     
         14 . The compressor according to  claim 12 , wherein the electric motor is located in the third flow path. 
     
     
         15 . The compressor according to  claim 12 , wherein a downstream end of the second flow path is fluidly coupled to the third flow path at a position between the electric motor and the fluid intake port. 
     
     
         16 . A compressor comprising:
 an electric motor;   a rotating shaft configured to be driven by the electric motor;   an impeller attached to the rotating shaft and configured to compress a fluid supplied;   a scroll flow path arranged around the impeller;   a turbine attached to the rotating shaft;   a turbine scroll flow path located around the turbine;   a fluid intake port of the impeller;   a turbine outlet of the turbine;   a first flow path guiding part of the fluid compressed by the impeller to the turbine; and   a second flow path fluidly coupled with the turbine outlet and the fluid intake port.   
     
     
         17 . The compressor according to  claim 16 , further comprising:
 a second impeller attached to the rotating shaft and configured to compress the fluid supplied;   a coupling flow path fluidly coupled with the impeller and the second impeller.   
     
     
         18 . The compressor according to  claim 17 , further comprising:
 a first scroll flow path located around the impeller; and   a second scroll flow path located around the second impeller,   wherein the coupling flow path is fluidly coupled with the first scroll flow path and the second scroll flow path.   
     
     
         19 . The compressor according to  claim 18 , further comprising a discharge flow path fluidly coupled with the second scroll flow path and the first flow path,
 wherein the first flow path is fluidly coupled with the turbine scroll flow path.   
     
     
         20 . The compressor according to  claim 16 , further comprising:
 a housing in which the second flow path formed; and   a return pipe connected to the housing and including a portion of the first flow path.