Patent ID: 11933298
Assignee: SANDEN CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A scroll compressor having a compression mechanism constituted of a fixed scroll and a movable scroll respectively formed at surfaces of mirror plates with spiral laps facing each other, and in which the movable scroll is revolved and turned with respect to the fixed scroll to thereby compress a working fluid in a compression chamber formed between the laps of both scrolls, comprising:
a back pressure chamber formed in a back surface of the mirror plate of the movable scroll; and
a first back pressure hole and a second back pressure hole formed in the mirror plate of the movable scroll and communicating the back pressure chamber and the compression chamber with each other,
wherein the first back pressure hole is formed in a position and/or dimension whereby the revolution turning motion of the movable scroll, the first back pressure hole is opened inside the lap of the fixed scroll and then closed by the lap of the fixed scroll, and
wherein the second back pressure hole is formed in a position and/or dimension whereby the revolution turning motion of the movable scroll, after the second back pressure hole is opened inside the lap of the movable scroll in a predetermined first crank angle range, the second back pressure hole is temporarily closed by the lap of the fixed scroll and then opened inside the lap of the fixed scroll in a predetermined second crank angle range.