Motor operated compressor

Abstract

A motor operated compressor has a housing having a motor chamber and a driving motor located in the motor chamber. The compressor also has a first scroll and a second scroll coupled to the first scroll to form a compression chamber. A rotating shaft is coupled to a rotor of the driving motor and eccentrically coupled to the first scroll. A rear housing of the motor forms a discharge chamber with the second scroll. A shaft receiving portion that radially supports the rotating shaft is located either in the second scroll or in the rear housing. An oil supply guide flow path located either in the second scroll or in the rear housing connects the discharge chamber and the shaft receiving portion. A decompression member inserted into the oil supply guide flow path, reduces a pressure of a fluid passing through the oil supply guide flow path.

What is claimed is: 
     
         1 . A motor operated compressor comprising:
 a housing having a motor chamber;   a driving motor located in the motor chamber of the housing;   a first scroll;   a second scroll coupled to the first scroll, the second scroll forming a compression chamber together with the first scroll;   a rotating shaft coupled to a rotor of the driving motor, the rotating shaft extending through the first scroll and the second scroll in an axial direction and being eccentrically coupled to the first scroll;   a rear housing forming a discharge chamber together with the second scroll;   a shaft receiving portion included in one of the second scroll or the rear housing, the shaft receiving portion configured to support the rotating shaft in a radial direction;   an oil supply guide flow path included in one of the second scroll or the rear housing, the oil supply guide flow path connecting the discharge chamber and the shaft receiving portion; and   a decompression member inserted into the oil supply guide flow path, the decompression member configured to reduce a pressure of a fluid passing through the oil supply guide flow path.   
     
     
         2 . The motor operated compressor of  claim 1 , wherein
 an oil supply protrusion portion extends in the radial direction from the shaft receiving portion, and   the oil supply guide flow path extends through the oil supply protrusion portion in the radial direction.   
     
     
         3 . The motor operated compressor of  claim 2 , wherein
 the oil supply guide flow path includes first and second open ends, the first end communicating with the discharge chamber and forming an oil supply inlet and the second end communicating with the shaft receiving portion and forming an oil supply outlet,   a decompression member accommodating portion is formed between the oil supply inlet and the oil supply outlet,   the decompression member is inserted into the decompression member accommodating portion,   a cross-sectional area of the decompression member accommodating portion is larger than a cross-sectional area of the decompression member, a decompression flow path being disposed between an outer circumferential surface of the decompression member and an inner circumferential surface of the decompression member accommodating portion, and   the oil supply inlet, the decompression member accommodating portion, and the oil supply outlet communicate with each other.   
     
     
         4 . The motor operated compressor of  claim 3 , wherein
 the oil supply outlet is eccentric with respect to the decompression member accommodating portion.   
     
     
         5 . The motor operated compressor of  claim 4 , wherein
 an axial length of the decompression member accommodating portion is larger than or equal to an axial length of the decompression member.   
     
     
         6 . The motor operated compressor of  claim 5 , wherein
 a decompression member support portion configured to support the decompression member in the axial direction is disposed between the oil supply outlet and the first end of the decompression member accommodating portion, and   a longitudinal axis of the decompression member support portion is eccentric with respect to a longitudinal axis of the oil supply outlet.   
     
     
         7 . The motor operated compressor of  claim 3 , wherein
 the oil supply outlet is concentric with the oil supply inlet in the axial direction.   
     
     
         8 . The motor operated compressor of  claim 7 , wherein
 the decompression member is inserted into and coupled with the decompression member accommodating portion.   
     
     
         9 . The motor operated compressor of  claim 8 , wherein
 a decompression passage extends along the axial direction through a central portion of the decompression member, the decompression passage configured to communicate with the oil supply outlet.   
     
     
         10 . The motor operated compressor of  claim 9 , wherein
 the decompression member includes a material having hardness lower than the decompression member accommodating portion.   
     
     
         11 . The motor operated compressor of  claim 8 , wherein
 a support protrusion portion extends in a radial direction from one end of the decompression member,   the decompression member accommodating portion includes a support recess portion configured to support the support protrusion portion in the axial direction, the support recess portion being located adjacent to the oil supply inlet, and   the oil supply outlet and an end portion of the decompression member facing the oil supply outlet are spaced apart from each other to form a communicating space allowing the decompression flow path and the oil supply outlet to communicate with each other.   
     
     
         12 . The motor operated compressor of  claim 7 , wherein
 a communicating space portion is formed toward the oil supply outlet at an end portion of the decompression member facing the oil supply outlet.   
     
     
         13 . The motor operated compressor of  claim 1 , wherein
 the oil supply guide flow path includes a foreign material blocking member configured to block a foreign material, and   the foreign material blocking member includes a plurality of oil supply through holes.   
     
     
         14 . The motor operated compressor of  claim 13 , wherein
 the foreign material blocking member is located adjacent to the discharge chamber.   
     
     
         15 . The motor operated compressor of  claim 14 , wherein
 a sectional area of at least one of the oil supply through holes is smaller than or equal to a sectional area between an inner circumferential surface of the oil supply guide flow path and an outer circumferential surface of the decompression member.   
     
     
         16 . A motor operated compressor comprising:
 an orbiting scroll;   a fixed scroll coupled to the orbiting scroll and forming a compression chamber;   a rotating shaft extending through the orbiting scroll and the fixed scroll, the shaft being rotatably coupled to the orbiting scroll;   a shaft receiving portion included in one of the fixed scroll or a housing coupled to the fixed scroll, the shaft receiving portion being configured to support the rotating shaft in a radial direction;   an oil supply guide flow path radially penetrating through a side wall surface of the shaft receiving portion and communicating with the shaft receiving portion; and   a decompression member inserted into the oil supply guide flow path,   wherein different portions of the oil supply guide flow path have longitudinal axes disposed eccentrically relative to teach other.   
     
     
         17 . The motor operated compressor of  claim 16 , wherein
 the decompression member is coupled to the oil supply guide flow path and fixed in the axial direction.   
     
     
         18 . The motor operated compressor of  claim 16 , wherein
 a decompression flow path is formed inside the decompression member.   
     
     
         19 . A motor operated compressor comprising:
 a housing extending from a front end to a rear end;   a motor positioned within the housing;   a fixed scroll positioned between the motor and the rear end;   an orbiting scroll positioned between the motor and the fixed scroll, the orbiting scroll being configured to engage with the fixed scroll to form a compression chamber rear end;   a shaft coupled to the motor at one end, the shaft being eccentrically coupled to the orbiting scroll, an opposite end of the shaft being received in a shaft receiving portion of the second scroll;   a discharge chamber formed between the fixed scroll and the rear end of the housing;   an oil supply guide flow path connecting the discharge chamber and the shaft receiving portion; and   a decompression rod positioned concentrically within the oil supply guide flow path.   
     
     
         20 . The motor operated compressor of  claim 19 , further including a decompression flow path extending axially through the decompression rod, the decompression flow path forming at least a portion of the oil supply guide flow path.