Motor-operated compressor

Abstract

The present disclosure provides a motor-operated compressor, comprising a main housing, a motor unit disposed at one end of the main housing, a rotating shaft coupled to the motor unit, a fixed scroll disposed at another end of the main housing facing the motor unit, an orbiting scroll coupled to the rotating shaft, and a rear housing disposed to face one side surface of the orbiting scroll opposite to a side of the orbiting scroll facing the fixed scroll. The rotating shaft may be rotatably coupled to the fixed scroll, and the orbiting scroll may be configured to perform an orbiting motion with respect to the fixed scroll. The orbiting scroll may be configured to form a compression space together with the fixed scroll and may comprise a discharge port. The rear housing may comprise a space portion configured to communicate with the discharge port of the orbiting scroll.

What is claimed is: 
     
         1 . A motor-operated compressor, comprising:
 a main housing;   a motor unit disposed at one end of the main housing;   a rotating shaft coupled to the motor unit;   a fixed scroll disposed at another end of the main housing and facing the motor unit, the fixed scroll being coupled to the rotating shaft;   an orbiting scroll coupled to the rotating shaft and configured to perform an orbiting motion with respect to the fixed scroll, the orbiting scroll configured to form a compression space together with the fixed scroll, and wherein the orbiting scroll includes a discharge port; and   a rear housing disposed to face one side surface of the orbiting scroll opposite to a side of the orbiting scroll facing the fixed scroll, the rear housing being coupled to the main housing,   wherein the rear housing includes a space portion configured to communicate with the discharge port of the orbiting scroll, and wherein a scroll support portion protruding in a radial direction is formed on an inner circumferential surface of the rear housing, the scroll support portion defining the space portion.   
     
     
         2 . The motor-operated compressor of  claim 1 , wherein an oil return passage is extends through both side surfaces of the scroll support portion in an axial direction, and
 wherein the orbiting scroll includes an oil guide passage configured to communicate with the oil return passage to guide oil introduced through the oil return passage to a bearing surface.   
     
     
         3 . The motor-operated compressor of  claim 2 , further including a thrust plate disposed between the orbiting scroll and the rear housing,
 wherein the thrust plate is fixedly coupled to the fixed scroll, and   wherein the thrust plate includes a first oil communication hole configured to provide communication between the oil return passage and the oil guide passage.   
     
     
         4 . The motor-operated compressor of  claim 3 , further including a sealing member disposed between the rear housing and the thrust plate,
 wherein the sealing member includes a second oil communication hole configured to provide communication between the first oil communication hole and the oil guide passage.   
     
     
         5 . The motor-operated compressor of  claim 4 , wherein the scroll support portion includes a sealing groove,
 wherein the sealing member is configured to be inserted in the sealing groove, and   wherein the oil return passage is configured to communicate with the sealing groove.   
     
     
         6 . The motor-operated compressor of  claim 5 , wherein the sealing member is constrained in a circumferential direction with respect to the rear housing, and wherein an inner diameter of the oil guide passage is greater than an inner diameter of the first oil communication hole. 
     
     
         7 . The motor-operated compressor of  claim 6 , wherein a fixing pin is provided between the rear housing and the sealing member. 
     
     
         8 . The motor-operated compressor of  claim 5 , wherein the sealing member is constrained in a circumferential direction with respect to the thrust plate, and wherein an inner diameter of the oil guide passage is greater than an inner diameter of the first oil communication hole. 
     
     
         9 . The motor-operated compressor of  claim 3 , wherein the scroll support portion includes a sealing groove,
 wherein a sealing member is configured to be inserted in the sealing groove, and   wherein the oil return passage is located inward or outward than the sealing groove.   
     
     
         10 . The motor-operated compressor of  claim 9 , wherein an inner diameter of the oil guide passage is greater than an inner diameter of the oil return passage or an inner diameter of the first communication hole. 
     
     
         11 . The motor-operated compressor of  claim 2 , wherein a rotating shaft coupling portion is provided at a central portion of the orbiting scroll,
 wherein an oil guide passage is provided at the rotating shaft coupled to the rotating shaft coupling portion to communicate with the oil guide passage, and   wherein the oil guide passage comprises an oil supply groove formed at the rotating shaft in an axial direction and at least one oil supply hole, the at least one oil supply hole penetrating from an inner circumferential surface of the oil supply groove to an outer circumferential surface of the rotating shaft.   
     
     
         12 . The motor-operated compressor of  claim 11 , wherein the oil guide passage is configured to communicate with the rotating shaft coupling portion. 
     
     
         13 . The motor-operated compressor of  claim 11 , wherein the fixed scroll includes a main bearing configured to radially support one side of the rotating shaft,
 wherein the rotating shaft coupling portion includes an eccentric bearing configured to radially support another side of the rotating shaft,   wherein a second gap between the rotating shaft and the eccentric bearing is greater than a first gap between the rotating shaft and the main bearing, and   wherein the oil guide passage is formed through an orbiting wrap of the orbiting scroll protruding toward the fixed scroll.   
     
     
         14 . The motor-operated compressor of  claim 13 , wherein an oil supply communication groove is provided at an end of the orbiting wrap facing the fixed scroll,
 wherein the oil communication groove is configured to communicate with an inner surface of the rotating shaft coupling portion, and   wherein an outer circumferential surface of the rotating shaft corresponding to an inner circumferential surface of the eccentric bearing comprises at least one oil communication groove recessed therefrom.   
     
     
         15 . A motor-operated compressor, comprising:
 a drive motor;   a frame scroll disposed to face the drive motor;   an orbiting scroll coupled to the frame scroll, the orbiting scroll being configured to form a compression space; and   a housing disposed at an opposite side of the frame scroll, the housing being configured to support the orbiting scroll,   wherein the housing includes a discharge space, the discharge space including an opened side facing the orbiting scroll, and the opened side of the discharge space including a scroll support portion extending in an annular shape,   wherein the scroll support portion includes a first passage penetrating in an axial direction, and the orbiting scroll includes a second passage configured to communicate with the first passage, and   wherein the second passage is configured to communicate with the compression space.   
     
     
         16 . The motor-operated compressor of  claim 15 , wherein the scroll support portion includes a sealing groove,
 wherein a sealing member is configured to be inserted into a surface of the scroll support facing the orbiting scroll,   wherein the first passage is configured to communicate with the sealing groove, and   wherein a communication hole is provided at the sealing member when the sealing member is inserted into the sealing groove to communicate the first passage and the second passage with each other.   
     
     
         17 . The motor-operated compressor of  claim 16 , wherein the orbiting scroll includes a rotating shaft coupling portion,
 wherein the rotating shaft is coupled to the rotating shaft coupling portion,   wherein the second passage is configured to communicate with the rotating shaft coupling portion, and   wherein the rotating shaft includes a third communication passage configured to provide communication between the second passage and the compression space.   
     
     
         18 . A motor-operated compressor, comprising:
 a first housing having a hollow cylindrical shape extending in a horizontal direction;   a drive motor disposed at one end of the first housing, the first housing surrounding the drive motor;   a rotating shaft coupled to the drive motor;   a compression unit comprising a fixed scroll and an orbiting scroll, wherein:
 the fixed scroll is disposed to face the drive motor; and 
 the orbiting scroll is configured to engage with the fixed scroll to form a compression space, the orbiting scroll comprising a discharge port; and 
   a second housing coupled to a rear end of the first housing, the second housing including a space portion configured to communicate with the discharge port of the orbiting scroll.   
     
     
         19 . The motor-operated compressor of  claim 18 , further including a scroll support portion protruding in a radial direction formed on an inner circumferential surface of the second housing. 
     
     
         20 . The motor-operated compressor of  claim 19 , further including an oil return passage extending through both side surfaces of the scroll support portion in an axial direction,
 wherein the orbiting scroll includes an oil guide passage configured to communicate with the oil return passage and to guide oil introduced through the oil return passage to a bearing surface.