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|1. (WO2018037917) SCROLL COMPRESSOR|
|Applicants:||SANDEN HOLDINGS CORPORATION
[Problem] To suppress pressure in a back pressure chamber to a pressure level that prevents excessive increase of a frictional force generated between a movable scroll and a fixed scroll even in a compression operation state where the pressure in the back pressure chamber becomes relatively high. [Solution] Provided is a scroll compressor 100 that includes: a housing 10 that has an intake chamber H1 and a discharge chamber H2 for fluid; a scroll unit 1 that, by means of revolving movement of a movable scroll 3 which meshes with a fixed scroll 2, compresses the fluid having flowed into a hermetically sealed space between both scrolls 2, 3 through the intake chamber H1 and discharges the fluid through the discharge chamber H2; a back pressure chamber H3 that is formed between the housing 10 and an end surface of the movable scroll 3 on the side opposite to the fixed scroll 2 side; a pressure supply passage L3 that connects the discharge chamber H2 and the back pressure chamber H3; and a pressure release passage L4 that connects the back pressure chamber H3 and the intake chamber H1, wherein the throttling area of an orifice 50 that is provided in the pressure release passage L4 and that narrows a flow passage area of the pressure release passage L4 autonomously changes in accordance with pressure in the back pressure chamber H3.