Abstract: [Problem] A scroll compressor is provided which has improved workability when a back pressure chamber and a compression chamber are communicated with each other. [Solution] A scroll compressor 1 includes a back pressure chamber 39 formed in a back surface of a mirror plate 31 of a movable scroll 22 in the scroll compressor 1, and a communication hole 51 which is formed in the mirror plate 31 of the movable scroll 22 and communicates the back pressure chamber 39 and a compression chamber 34 with each other. The communication hole 51 is constituted of a large-diameter hole section 52 located on the back pressure chamber 33 side of the mirror plate 31 of the movable scroll 22, and a small-diameter hole section 53 which continues from the large-diameter hole section 52 to reach the compression chamber 34.

Abstract: [Problem] A scroll compressor is provided which effectively suppresses the occurrence of localized contact caused by deformation of a fixed scroll or a movable scroll due to the influence of a compressive reaction force or thermal expansion and shortens a break-in time. [Solution] Laps 24 and 32 of a fixed scroll 21 and a movable scroll 22 are constituted to have a plurality of step portions between a winding end portion at an outermost periphery and a winding start portion at an innermost periphery and decrease stepwise in height toward the winding start portion from the winding end portion. The position and height of each step portion are set so that when the spiral laps 24 and 32 are expanded on a predetermined plane, a base point of each step portion is placed on a predetermined arc drawn on the plane.

Abstract: [Problem] A scroll compressor is provided which effectively suppresses the occurrence of localized contact caused by deformation of a fixed scroll or a movable scroll due to the influence of a compressive reaction force or thermal expansion and shortens a break-in time. [Solution] Laps 24 and 32 of a fixed scroll 21 and a movable scroll 22 are constituted to have a plurality of step portions between a winding end portion at an outermost periphery and a winding start portion at an innermost periphery and decrease stepwise in height toward the winding start portion from the winding end portion. The position and height of each step portion are set so that when the spiral laps 24 and 32 are expanded on a predetermined plane, a base point of each step portion is placed on a predetermined arc drawn on the plane.

Abstract: [Problem] A scroll compressor is provided which has improved workability when a back pressure chamber and a compression chamber are communicated with each other. [Solution] A scroll compressor 1 includes a back pressure chamber 39 formed in a back surface of a mirror plate 31 of a movable scroll 22 in the scroll compressor 1, and a communication hole 51 which is formed in the mirror plate 31 of the movable scroll 22 and communicates the back pressure chamber 39 and a compression chamber 3-1 with each other. The communication hole 51 is constituted of a large-diameter hole section 52 located on the back pressure chamber 33 side of the mirror plate 31 of the movable scroll 22, and a small-diameter hole section 53 which continues from the large-diameter hole section 52 to reach the compression chamber 34.

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.