Scroll compressor

A scroll compressor, comprising:

• a casing having a low-pressure portion and a high-pressure portion;
• an orbiting scroll coupled to a rotary shaft in the low-pressure portion of the casing to perform an orbiting motion;
• a non-orbiting scroll engaged with the orbiting scroll to form compression chambers and movable relative to the orbiting scroll in an axial direction of the scroll compressor;
• a back pressure chamber assembly disposed at a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a first back pressure unit disposed between a first compression chamber of the compression chambers and the back pressure chamber to allow movement of a refrigerant from the first compression chamber to the back pressure chamber while blocking reverse movement of the refrigerant, the first back pressure unit comprising a first back pressure valve, the first back pressure valve including a first valve body that is slidably inserted into a first back pressure hole provided between the first compression chamber and the back pressure chamber to close the first back pressure hole, and a plurality of first communication grooves recessed into an outer circumferential surface of the first valve body in the axial direction to communicate with the first back pressure hole;
• and
• a second back pressure unit disposed between the back pressure chamber and a second compression chamber of the compressor chambers and spaced apart from the back pressure chamber, to allow movement of the refrigerant from the back pressure chamber to the second compression chamber while blocking reverse movement of the refrigerant, the second back pressure unit comprising a second back pressure valve, the second back pressure valve including a second valve body that is slidably inserted into a second back pressure hole provided between the second compression chamber and the back pressure chamber to block the second back pressure hole, and a plurality of second communication grooves recessed into an outer circumferential surface of the second valve body in the axial direction to communicate with the second back pressure hole.

A scroll compressor, comprising:

• a casing having a low-pressure portion and a high-pressure portion;
• an orbiting scroll coupled to a rotary shaft in the low-pressure portion of the casing to perform an orbiting motion;
• a non-orbiting scroll engaged with the orbiting scroll to form compression chambers and movable relative to the orbiting scroll in an axial direction of the scroll compressor;
• a back pressure chamber assembly disposed at a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a first back pressure unit disposed between a first compression chamber of the compression chambers and the back pressure chamber to allow movement of a refrigerant from the first compression chamber to the back pressure chamber while blocking reverse movement of the refrigerant;
• and
• a second back pressure unit disposed between the back pressure chamber and a second compression chamber of the compressor chambers and spaced apart from the first back pressure unit, to allow movement of the refrigerant from the back pressure chamber to the second compression chamber while blocking reverse movement of the refrigerant, wherein the second back pressure unit communicates with the second compression chamber having a relatively higher pressure than a pressure of the first compression chamber communicating with the first back pressure unit, wherein the first back pressure unit comprises a first back pressure hole that provides communication between the first compression chamber and the back pressure chamber, and a first back pressure valve that opens and closes the first back pressure hole according to a pressure difference between the first compression chamber and the back pressure chamber, wherein the second back pressure unit comprises a second back pressure hole that provides communication between the back pressure chamber and the second compression chamber, and a second back pressure valve that opens and closes the second back pressure hole according to a pressure difference between the second compression chamber and the back pressure chamber, and wherein the first back pressure hole and the second back pressure hole are spaced apart by a predetermined rotational angle in a direction in which the compression chambers are formed.