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 a compression chamber and movable relative to the orbiting scroll in an axial direction;
• a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other;
• and
• a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein the back pressure passage comprises:
• a scroll back pressure hole disposed in the non-orbiting scroll so that one end thereof communicates with the compression chamber;
• and
• a plate back pressure hole disposed in the back pressure chamber assembly so that a first end thereof communicates with the scroll back pressure hole and a second end communicates with the back pressure chamber, and wherein the flow resistance portion comprises:
• a first flow resistance portion inserted into the scroll back pressure hole;
• and
• a second flow resistance portion disposed at one side of the first flow resistance portion in the axial direction at a spacing from the first flow resistance portion, and inserted into the plate back pressure hole, wherein the scroll back pressure hole comprises:
• a small-diameter portion having a first end that communicates with the compression chamber;
• and
• a large-diameter portion that extends from a second end of the small-diameter portion toward the plate back pressure hole, wherein a first refrigerant passage is defined between an outer circumferential surface of the first flow resistance portion and an inner circumferential surface of the large-diameter portion, wherein the first refrigerant passage has a cross-sectional area smaller than or equal to a cross-sectional area of the small-diameter portion, wherein a second refrigerant passage is defined between an outer circumferential surface of the second flow resistance portion and an inner circumferential surface of the plate back pressure hole, and wherein the second refrigerant passage has a cross-sectional area smaller than or equal to the cross-sectional area of the small-diameter portion.

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 a compression chamber and movable relative to the orbiting scroll in an axial direction;
• a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other;
• and
• a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein a gasket is disposed between the non-orbiting scroll and the back pressure chamber assembly, and wherein the flow resistance portion extends in a lateral direction from at least one of the non-orbiting scroll, the back pressure chamber assembly, or the gasket, wherein the back pressure passage comprises:
• a scroll back pressure hole disposed in the non-orbiting scroll so that one end thereof communicates with the compression chamber;
• and
• a plate back pressure hole disposed in the back pressure chamber assembly so that a first end thereof communicates with the scroll back pressure hole and a second end communicates with the back pressure chamber, wherein a first end of the flow resistance portion is connected to the scroll back pressure hole and a second end of the flow resistance portion is connected to the plate back pressure hole, and wherein ends of the flow resistance portion are on different axes, so that an axial height is smaller than a lateral width.

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 a compression chamber and movable relative to the orbiting scroll in an axial direction;
• a back pressure chamber assembly disposed on a rear surface of the non-orbiting scroll to form a back pressure chamber;
• a back pressure passage defined such that the compression chamber and the back pressure chamber communicate with each other;
• and
• a flow resistance portion disposed at a middle portion of the back pressure passage to reduce an amount of refrigerant flowing through the back pressure passage, wherein the flow resistance portion is press-fitted into the back pressure passage, wherein at least one refrigerant passage groove is recessed laterally into an inner circumferential surface of the back pressure passage to be spaced apart from an outer circumferential surface of the flow resistance portion.