A vacuum pump in accordance with the invention, in particular a scroll vacuum pump, comprises a first spiral element that has a first wall that extends spirally about a first axis, that extends in an axial direction from a first support, and that has a first free end face facing away from the first support, and a second spiral element that has a second wall that extends spirally about a second axis, that extends in the axial direction from a second support, and that has a second free end face facing away from the second support, wherein the first spiral element and the second spiral element are movable relative to one another and are arranged such that the first wall and the second wall sealingly engage into one another while forming pumping spaces, wherein the free end face of at least one of the walls has a recess, in particular a groove, which extends in a longitudinal direction of the wall and in which at least one seal is movably arranged, and wherein the recess is laterally bounded by at least one inner wall that extends at least sectionally, preferably continuously, obliquely to the axial direction and that is configured to cooperate with a side wall of the seal extending at least sectionally, preferably continuously, obliquely to the axial direction.

A seal groove is cut in the distal end face of a wrap of a fixed scroll, with a tip seal being fitted in the seal groove. Swelling members are interposed between both side faces of the tip seal and corresponding opposite side faces of the wrap. Condensed liquid of working medium w and water condensed from steam contained in the working medium w that are present between the tip seal and an end plate provide a sealing effect. When the swelling members swell upon absorbing the condensed liquids, they exert a strong pressing force on the tip seal and the wrap, thereby firmly retaining the tip seal in position. This prevents the tip seal from being pressed against the end plate, so that wear of the tip seal is reduced.

A scroll compressor is provided which is configured such that an arcuate section may be formed from a suction end of a wrap to a first point to increase a suction volume, and a logarithmic spiral section in which a wrap thickness increases may be formed from a second point to a discharge end of the wrap. This may increase a volume ratio of the compressor so as to increase a capacity of the compressor and prevent damage to the wrap due to a high compression ratio operation, thereby enhancing reliability of the compressor.

A scroll fluid machine includes fixed and orbiting scrolls which form a compression chamber; a land which divides the compression chamber into first-stage and second-stage compression chambers; a wrap groove formed in a spiral shape along a tip of a fixed wrap of the fixed scroll; an intermediate groove formed in the land; a seal member; and an intermediate seal member. The land includes a first-stage outlet communicating with the first-stage compression chamber and a second-stage inlet communicating with the second-stage compression chamber. The wrap groove includes an outer peripheral wrap groove adjacent to the land on a radially outward side and an inner peripheral wrap groove adjacent to the land on a radially inward side. The intermediate groove is in communication with the outer and inner peripheral wrap grooves. The seal member is fitted in the wrap groove except the outer and inner wrap grooves. The intermediate seal member includes an outer peripheral seal portion fitted in the outer peripheral wrap groove, an inner peripheral seal portion fitted in the inner peripheral wrap groove, and the intermediate seal portion fitted in the intermediate groove and connected to the outer and inner peripheral seal portions.

A dynamic vortex disk for a compressor includes a dynamic substrate with a first side and a second side, and a dynamic vortex wall, which is integrally molded with the dynamic substrate, and extends around an axis of the dynamic substrate at the first side and away from the axis. The dynamic vortex wall further has an end surface opposite to the first side and away from the second side, and a groove deviating from a centerline of the dynamic vortex wall and formed on the end surface. The groove has a proximal end close to the axis of the dynamic substrate and an opposing distal end. An air supply channel is configured to extend along the axis through an interior of the dynamic vortex wall until it opens to the second side. The groove and the air supply channel are connected at the distal end.

A first coating layer formed by tin plating is formed on a compression chamber-side end face of a baseplate of one scroll and a surface of a spiral wall, a second coating layer formed by nickel-phosphorus plating is formed on a compression chamber-side end face of a baseplate of another scroll and a surface of a spiral wall, a wall height of the spiral wall of the other scroll is higher than a wall height of the spiral wall of the one scroll, and the first coating layer at the tip of the spiral wall of the one scroll and the second coating layer of the baseplate of the other scroll are separated from each other, and the first coating layer of the baseplate of the one scroll and the second coating layer at the tip of the spiral wall of the other scroll are in contact with each other.

A scroll machine, in particular a scroll compressor, has a first scroll unit with a base and a scroll rib protruding from the base with a scroll rib tip, a second scroll unit with a base and a scroll rib protruding from the base with a scroll rib tip. The first scroll unit can be moved along an orbital path relative to the second scroll unit and the first scroll unit and the second scroll unit engage with each other to form pressure chambers, and the scroll rib of a scroll rib tip having a face seal abuts sealingly to the base of the respective other scroll unit. The base of the first scroll unit and/or the base of the second scroll unit include(s) a pocket with an insert plate arranged in the pocket. Also contemplated is a refrigeration system.

Provided is a scroll compressor with durability improved by effectively reducing strong contact between a wrap of a movable scroll and an end plate of a fixed scroll without impairing a function. A compression chamber 34 formed between wraps 24, 32 of a fixed scroll 21 and a movable scroll 22 is narrowed while moving from the outside to the inside, thereby compressing working fluid. The wrap 32 of the movable scroll 22 has an inclined portion of which a height gradually decreases toward a winding end point P2 in an area from a point Pl at which a line L1 extending outward from the center O of a spiral base circle through an outer wall extension start point S intersects the outermost wrap 32 to the winding end point P2.

A first coating layer formed by tin plating is formed on a compression chamber-side end face of a baseplate of one scroll and a surface of a spiral wall, a second coating layer formed by nickel-phosphorus plating is formed on a compression chamber-side end face of a baseplate of another scroll and a surface of a spiral wall, a wall height of the spiral wall of the other scroll is higher than a wall height of the spiral wall of the one scroll, and the first coating layer at the tip of the spiral wall of the one scroll and the second coating layer of the baseplate of the other scroll are separated from each other, and the first coating layer of the baseplate of the one scroll and the second coating layer at the tip of the spiral wall of the other scroll are in contact with each other.