Lg Electronics Inc.

Sooho Jang

Sanghun Seong

Seokhwan Moon

Jinyong Jang

Jaesang Lee

Byeonghun Yu

Honghee Park

Yunhi Lee

Gunyoung Park

A scroll compressor is provided that may include a first back pressure unit that allows a refrigerant to flow from a first compression chamber to a back pressure chamber while blocking a reverse flow of the refrigerant, and a second back pressure unit that allows the refrigerant to flow from the back pressure chamber to a second compression chamber while blocking a reverse flow of the refrigerant. The first back pressure unit and the second back pressure unit may be spaced apart from each other in a direction that the compression chambers are formed. This may reduce pressure pulsation in the back pressure chamber. Also, leakage between compression chambers may be suppressed and simultaneously friction loss may be reduced by appropriately adjusting the pressure in the back pressure chamber. This is especially advantageous for enhancing compression efficiency under low load operating conditions (or in a low pressure ratio operation).

Scroll compressor

A scroll compressor is provided that may have a first sealing portion defined between an inner surface of an orbiting wrap and an outer surface of a non-orbiting wrap facing the inner surface of the orbiting wrap in a radial direction, and a second sealing portion defined between an inner surface of the non-orbiting wrap and an outer surface of the orbiting wrap facing the inner surface of the non-orbiting wrap in the radial direction. Further, sealing surfaces where the wraps facing each other are in surface-contact with each other may be formed on at least one of the first sealing portion or the second sealing portion. This may enlarge a sealing area between side surfaces of the wraps facing each other to suppress or prevent leakage of refrigerant suctioned in a compression chamber, thereby improving indicated efficiency and volumetric efficiency.

A scroll compressor is disclosed. The scroll compressor may include an oil supply hole penetrating from an oil passage to an outer circumferential surface of a rotating shaft, and an oil supply groove communicating with the oil supply hole and formed along the outer circumferential surface of the rotating shaft. The oil supply groove may be provided in plurality axially spaced apart by a preset distance. This can prevent the oil supply groove from invading an oil film section and increase centrifugal force against oil in the oil supply groove, thereby suppressing friction loss and wear between a main frame and the rotating shaft.

Scroll compressor having oil supply groove in communication with oil supply hole defined from oil passage to rotating shaft surface

A scroll compressor is provided that may include first and second variable-capacity units that provide communication between a first intermediate pressure chamber and a low-pressure portion and between a second intermediate pressure chamber and the low-pressure portion. The first variable-capacity unit may include a first variable-capacity passage that communicates with the intermediate pressure chamber, at least one first variable-capacity valve that opens/closes the first variable-capacity passage, and a first variable-capacity opening and closing valve that controls opening/closing of the at least one first variable-capacity valve, and the second variable-capacity unit may include a second variable-capacity passage that communicates with a second intermediate pressure chamber, at least one second variable-capacity valve that opens/closes the second variable-capacity passage, and a second variable-capacity opening and closing valve that controls opening/closing of the at least one second variable-capacity valve.

In a scroll compressor, a discharge chamber is provided in an inner space of a back pressure chamber inner wall, a discharge port is provided inside the discharge chamber, a bypass hole is provided around the discharge port, and a communicating recess portion allowing the discharge chamber to communicate with the bypass hole is provided on an inner circumferential surface of the back pressure chamber inner wall forming the discharge chamber. Through this, the bypass hole may be easily configured in addition to the discharge port, thereby increasing an operation range of the compressor and suppressing overcompression.

Disclosed herein is a rotary engine a supply flow passage provided in the housing to allow the lubricating oil to move therethrough, a sealing part arranged to contact the rotor to selectively close the supply flow passage, and an elastic part configured to press the sealing part toward the combustion chamber.

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Seoul, South Korea

Sooho Jang