Scroll compressor

A scroll compressor comprising:

• a casing;
• a drive motor disposed inside the casing;
• a rotating shaft rotatably coupled to the drive motor;
• an orbiting scroll disposed inside the casing and coupled to the rotating shaft, the orbiting scroll comprising (i) an orbiting end plate portion coupled to the rotating shaft and (ii) an orbiting wrap that protrudes in a spiral shape from a surface of the orbiting end plate portion;
• a fixed scroll comprising a fixed wrap engaged with the orbiting wrap, wherein the fixed wrap and the orbiting wrap are configured to define a compression chamber therebetween based on the orbiting wrap performing an orbital motion relative to the fixed wrap;
• and a main frame that rotatably supports the orbiting scroll, the main frame defining a first back pressure chamber with the orbiting scroll, wherein the orbiting scroll defines an orbiting back pressure hole having (i) a first end configured to fluidly communicate with the first back pressure chamber and (ii) a second end located between outer and inner circumferences of the fixed wrap, and wherein the fixed wrap is configured to cover at least a portion of the second end of the orbiting back pressure hole based on the orbiting wrap performing the orbital motion relative to the fixed wrap, wherein the fixed scroll further comprises a fixed end plate portion that defines a fixed back pressure hole, the fixed back pressure hole defining a passage that is bent at least once between the first end and the second end, and wherein the fixed wrap is disposed on the fixed end plate portion, wherein the orbiting wrap has an end portion that is configured to cover the fixed back pressure hole based on the orbiting wrap performing the orbital motion relative to the fixed wrap, and wherein a thickness of the end portion of the orbiting wrap is twice or more of an orbiting radius of the orbiting scroll.

A scroll compressor comprising:

• a casing;
• a drive motor disposed inside the casing;
• a rotating shaft rotatably coupled to the drive motor;
• an orbiting scroll disposed inside the casing and coupled to the rotating shaft, the orbiting scroll comprising (i) an orbiting end plate portion coupled to the rotating shaft and (ii) an orbiting wrap having a spiral shape extending from one surface of the orbiting end plate portion;
• and
• a fixed scroll comprising (i) a fixed end plate portion and (ii) a fixed wrap disposed on the fixed end plate portion and engaged with the orbiting wrap, wherein the fixed wrap and the orbiting wrap are configured to define a compression chamber therebetween based on the orbiting wrap performing an orbital motion relative to the fixed wrap;
• and
• a main frame that rotatably supports the orbiting scroll, the main frame defining a first back pressure chamber with the orbiting scroll,
• wherein the orbiting end plate portion defines an orbiting back pressure hole comprising:
• a first hole that extends parallel to the rotating shaft, and
• a second hole that extends in a lateral direction from one end of the first hole to the first back pressure chamber and fluidly communicates between the first hole and the first back pressure chamber,
• wherein the first hole is defined between outer and inner circumferences of the fixed wrap such that the fixed wrap covers at least a portion of the first hole during the orbital motion of the orbiting wrap relative to the fixed wrap,
• wherein the fixed end plate portion defines a fixed back pressure hole having (i) a first end that is in fluid communication with the first back pressure chamber and (ii) a second end that is covered by an end portion of the orbiting wrap, the fixed back pressure hole defining a passage that is bent at least once between the first end and the second end, and
• wherein a thickness of the end portion of the orbiting wrap is twice or more of an orbiting radius of the orbiting scroll.