Importance

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Abstract

To prevent or reduce functional disturbance of a back-pressure control valve caused by contamination, a scroll compressor includes: a scroll unit having a fixed scroll and an orbiting scroll; a discharge chamber (H3) into which fluid compressed by the scroll unit is discharged; a back-pressure chamber (H4) configured to apply a back pressure that presses the orbiting scroll against the fixed scroll; and a switching valve (900) disposed at some midpoint of a back-pressure supply passage (L1) connecting the discharge chamber (H3) and the back-pressure chamber (H4) in communication. The switching valve (900) is configured to switch between a first state in which the switching valve (900) connects the discharge chamber (H3) with the back-pressure chamber (H4) in communication and a second state in which the switching valve (900) connects the back-pressure chamber (H4) with a suction chamber (H1), in accordance with an operational state of the scroll unit.

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First Claim