Motor-operated compressor

Abstract

A motor-operated compressor according to the present disclosure includes a first scroll performing an orbiting motion, a second scroll coupled to the first scroll to form a compression chamber with the first scroll and radially supporting a rotation shaft, a main housing coupled to the second scroll outside the second scroll, and coupled with a driving motor to form a motor chamber, the main housing including an opened end at one side of the motor chamber, a frame portion formed at another side of the motor chamber to axially support the second scroll, and a first bearing portion formed through the frame portion so that the rotation shaft is inserted therethrough to be radially supported, and an inverter housing coupled to the opened end of the main housing to seal the motor chamber, whereby a main frame can be easily formed and a compressor fabrication process can be simplified.

What is claimed is: 
     
         1 . A compressor, comprising:
 a driving motor comprising a stator and a rotor;   a rotation shaft coupled to the rotor;   a first scroll located at a side of the driving motor and configured to perform an orbiting motion based on rotation of the rotation shaft, the rotation shaft extending in an axial direction and being eccentrically coupled to the first scroll;   a second scroll that is coupled to the first scroll and that defines a compression chamber together with the first scroll;   a main housing that is coupled to an outside of the second scroll, that is coupled to the driving motor, and that defines a motor chamber that accommodates the driving motor, the main housing comprising:
 an opened end portion located at a first side of the motor chamber, 
 a frame portion that is located at a second side of the motor chamber and that is configured to support the second scroll in the axial direction, and 
 a first bearing portion that extends through at least a portion of the frame portion in the axial direction, that is configured to receive the rotation shaft, and that is configured to support the rotation shaft in a radial direction; and 
   an inverter housing that accommodates an inverter element electrically connected to the driving motor and that is coupled to the opened end portion of the main housing to seal the motor chamber.   
     
     
         2 . The compressor of  claim 1 , wherein the frame portion comprises a first protrusion that protrudes from a side of the frame portion in the radial direction, the first protrusion defining a first passage that extends through the first protrusion and that is configured to communicate with the motor chamber,
 wherein the second scroll is coupled to an axial end surface of the frame portion,   wherein the second scroll comprises a second protrusion that protrudes in the radial direction from a side of the second scroll corresponding to the first protrusion, the second protrusion defining a second passage that extends through the second protrusion toward the frame portion, and   wherein the second passage has a first end in communication with the first passage and a second end in communication with the compression chamber.   
     
     
         3 . The compressor of  claim 1 , wherein a distance from a center of the stator in the axial direction to a first end defined at the opened end portion is less than a distance from the center of the stator in the axial direction to a second end defined at the frame portion. 
     
     
         4 . The compressor of  claim 3 , wherein the rotation shaft passes through the first scroll and is rotatably coupled to the second scroll, and
 wherein the rotation shaft defines an oil supply passage that passes through an inside of the rotation shaft in the axial direction and that is configured to communicate with an oil guide passage defined at the second scroll.   
     
     
         5 . The compressor of  claim 4 , wherein the second scroll comprises a second bearing portion configured to rotatably accommodate an end portion of the rotation shaft,
 wherein the second bearing portion extends outward of the end portion of the rotation shaft in the axial direction and defines an oil guide space between the end portion of the rotation shaft and the second bearing portion, and   wherein the oil guide passage is configured to communicate with the oil guide space.   
     
     
         6 . The compressor of  claim 5 , wherein the second scroll comprises a third protrusion that protrudes from a rear surface of the second scroll in the axial direction, and
 wherein the third protrusion extends in the radial direction and defines the oil guide passage therein.   
     
     
         7 . The compressor of  claim 5 , further comprising a rear housing that is coupled to the second scroll, the rear housing comprising a third protrusion that protrudes from an inner surface of the rear housing in the axial direction toward the second scroll, and
 wherein the third protrusion extends in the radial direction and defines the oil guide passage therein.   
     
     
         8 . The compressor of  claim 4 , wherein the rotation shaft further defines a plurality of oil supply holes that extend from the oil supply passage toward an outer circumferential surface of the rotation shaft and that are configured to communicate with bearing surfaces located at the second scroll, the first scroll, and the frame portion. 
     
     
         9 . The compressor of  claim 8 , wherein the frame portion and the first scroll face each other and define a back-pressure chamber located between the frame portion and the first scroll and configured to communicate with the plurality of oil supply holes, and
 wherein the back-pressure chamber is configured to communicate with the motor chamber through a gap defined between the outer circumferential surface of the rotation shaft and an inner circumferential surface of the frame portion.   
     
     
         10 . The compressor of  claim 1 , wherein the inverter housing comprises a sealing surface portion corresponding to the opened end portion of the main housing, and
 wherein the compressor further comprises a coupling member that is located between the main housing and the sealing surface portion of the inverter housing and that is configured to couple the opened end portion of the main housing and the sealing surface portion of the inverter housing to each other.   
     
     
         11 . The compressor of  claim 10 , wherein the coupling member comprises a plurality of rivets that protrude in the axial direction from the opened end portion of the main housing and that are arranged along a circumferential direction of the main housing with predetermined intervals, and
 wherein the plurality of rivets are configured to pass through the inverter housing based on coupling the main housing and the inverter housing to each other.   
     
     
         12 . The compressor of  claim 10 , wherein the coupling member comprises a plurality of rivets that are press-fitted into the opened end portion of the main housing in the axial direction and that are arranged along a circumferential direction of the main housing with predetermined intervals, and
 wherein the plurality of rivets are configured to couple to the main housing through the inverter housing.   
     
     
         13 . The compressor of  claim 10 , wherein the coupling member comprises bolts configured to couple to the opened end portion of the main housing through the inverter housing. 
     
     
         14 . The compressor of  claim 10 , wherein the sealing surface portion comprises a sealing protrusion that protrudes from a side of the sealing surface portion toward the main housing, that has an annular shape, and that is inserted into the opened end portion of the main housing. 
     
     
         15 . The compressor of  claim 14 , further comprising a sealing member located between the main housing and the inverter housing,
 wherein the sealing member comprises:
 a first sealing portion located between the opened end portion of the main housing and the sealing surface portion of the inverter housing, the first sealing portion defining a plurality of holes configured to receive the coupling member; and 
 a second sealing portion located between an inner circumferential surface of the main housing and an outer circumferential surface of the sealing protrusion of the inverter housing. 
   
     
     
         16 . The compressor of  claim 15 , wherein the first sealing portion and the second sealing portion are integrally formed with each other. 
     
     
         17 . A compressor comprising:
 a main housing that defines a motor chamber therein, the main housing comprising an open ended portion that defines an opening at a first side of the main housing;   a driving motor located in the motor chamber, the driving motor comprises a stator coupled to an inside of the main housing and a rotor disposed radially inside of the stator and configured to rotate relative to the stator;   an inverter housing that is coupled to the first side of the main housing and that covers the opening of the main housing;   a rotation shaft that is coupled to the rotor and that passes through and extends outward of a second side of the main housing in an axial direction;   a first scroll that is located at the second side of the main housing, that is coupled to the rotation shaft, and that is configured to perform an orbiting motion based on rotation of the rotation shaft; and   a second scroll that is coupled to the first scroll, that defines a compression chamber together with the first scroll, and that is coupled to the second side of the main housing,   wherein the second scroll is disposed outside of the main housing and defines at least a portion of an exterior of the compressor.   
     
     
         18 . The compressor of  claim 17 , wherein the main housing further comprises:
 a frame portion that is located at the second side of the main housing and that is configured to support the second scroll in the axial direction; and   a first bearing portion that extends through at least a portion of the frame portion in the axial direction, that is configured to receive the rotation shaft, and that is configured to support the rotation shaft in a radial direction.   
     
     
         19 . The compressor of  claim 17 , wherein the main housing further comprises a first protrusion that protrudes radially outward from the second side of the main housing and that faces the second scroll in the axial direction, the first protrusion defining a first passage that extends through the first protrusion in the axial direction and that is configured to communicate with the motor chamber,
 wherein the second scroll comprises a second protrusion that protrudes radially outward from an outer circumference of the second scroll corresponding to the first protrusion, the second protrusion defining a second passage that extends through the second protrusion, and   wherein the second passage has a first end in communication with the first passage and a second end in communication with the compression chamber.   
     
     
         20 . The compressor of  claim 19 , wherein the second passage extends in a direction inclined with respect to the first passage.