Abstract: A valve guard for restricting the amount of deformation of a valve disc has a main body part abuttable with the back surface of the valve disc, and a fixation part extending to outside of a receding part. Upon mounting the valve guard to an end plate part, the fixation part is firmly attached to the outside of the receding part of the end plate part.

Abstract: A rotary fluid machine includes a cylinder with an annular cylinder chamber, an annular piston and a blade. The annular piston is disposed in the cylinder chamber so as to be eccentric to the cylinder. The annular piston divides the cylinder chamber into an outer cylinder chamber and an inner cylinder chamber. The blade is arranged in the cylinder chambers to divide each of the outer and inner cylinder chambers into a high-pressure chamber and a low-pressure chamber. The cylinder and the piston are arranged to eccentrically move relative to each other. A height of the outer cylinder chamber is different from a height of the inner cylinder chamber as measured in a direction of a rotational axis of the rotary fluid machine.

Abstract: A bolt hole receiving a fixing bolt is formed in a portion of an end plate overlapping an annular piston or a fixed wrap as viewed in a thickness direction of the end plate to open at the back face of the end plate. In fixing a discharge valve to the end plate, the fixing bolt is screwed into the bolt hole.

Abstract: A blade moves backward/forward to enter four different states, namely a first state in which the tip thereof is in sliding contact with the internal peripheral surface of an external side cylinder part, a second state in which the tip is positioned in the cutaway portion of a ring-shaped piston to thereby place only an external side cylinder chamber at rest, a third state in which the tip is positioned in the cutaway portion of an internal side cylinder part to thereby place only the external side cylinder chamber and an intermediate cylinder chamber at rest, and a whole rest state in which the tip is positioned in a blade groove to thereby place all of the cylinder chambers at rest.

Abstract: A rotary compressor includes a compression mechanism, an electric motor and a controller. The compression mechanism includes a piston and a cylinder having two cylinder chambers. The electric motor is configured to change volumes of the cylinder chambers by eccentrically moving the cylinder and the piston relative to each other. The controller is configured to change an output torque of the electric motor in accordance with a variation in a load torque of the compression mechanism in one turn of rotation.

Abstract: A rotary fluid machinery includes a fixed member, a drive shaft driven and rotated about a rotation axis, a movable member, a movable member support part and a reverse moment generating mechanism. The movable member is rotatably mounted at the drive shaft with its center being eccentrically disposed relative to the rotation axis, with the movable member and the fixed member forming a fluid chamber. Revolution of the movable member changes the volume of the fluid chamber. The movable member is configured to swing in association with its revolution. The reverse moment generating mechanism generates a moment in a reverse direction about the rotation axis relative to a moment about the rotation axis caused by the revolving movement of the movable member.

Abstract: A bolt hole receiving a fixing bolt is formed in a portion of an end plate overlapping an annular piston or a fixed wrap as viewed in a thickness direction of the end plate to open at the back face of the end plate. In fixing a discharge valve to the end plate, the fixing bolt is screwed into the bolt hole.

Abstract: A rotary compressor includes a fixed side and a movable side that is eccentrically movable relative to the fixed side. The movable side moves in response to operation of a drive mechanism, which rotates a drive shaft. The fixed side has a main bearing formed as a unitary part. A cylinder may serve as the movable side, which is coupled through an eccentric part to the drive shaft. The drive shaft is supported by the main bearing. With such an arrangement, a ring-shaped piston may serve as the fixed side, which is formed integrally with the main bearing in a front head.

Abstract: A compression mechanism has a cylinder, a suction passage and a discharge passage. The suction passage of a cylinder is connected to a suction pipe. The discharge passage is open to an inner space of a sealed housing. A discharge gas is discharged through a discharge pipe. The cylinder is formed with a communicating passage extending from a suction passage to a suction pressure chamber to lead a suction gas in the suction passage into the suction pressure chamber and thereby allow a pressure of the suction gas in the suction passage to act on an outside surface of the cylinder.

Abstract: A valve guard for restricting the amount of deformation of a valve disc has a main body part abuttable with the back surface of the valve disc, and a fixation part extending to outside of a receding part. Upon mounting the valve guard to an end plate part, the fixation part is firmly attached to the outside of the receding part of the end plate part.

Abstract: In a compression mechanism of a rotary compressor, a cylinder chamber is defined by a cylinder and a second housing. A back surface side gap is defined between an end plate part of the cylinder and a flat plate part of a first housing. The first housing is provided with a communicating path and a differential pressure regulating valve. When the difference between the suction pressure and the discharge pressure is small, the discharge pressure is introduced through the communicating path to an intermediate gap whereby both an internal gap and the intermediate gap are placed at the same pressure as the discharge pressure. Conversely, when the difference between the discharge pressure and the suction pressure is great, the communicating path is made discontinuous by the differential pressure regulating valve whereby the intermediate gap is placed at an intermediate pressure lower than the discharge pressure.

Abstract: A bolt hole receiving a fixing bolt is formed in a portion of an end plate overlapping an annular piston or a fixed wrap as viewed in a thickness direction of the end plate to open at the back face of the end plate. In fixing a discharge valve o the end plate, the fixing bolt is screwed into the bolt hole.

Abstract: A blade moves backward/forward to enter four different states, namely a first state in which the tip thereof is in sliding contact with the internal peripheral surface of an external side cylinder part, a second state in which the tip is positioned in the cutaway portion of a ring-shaped piston to thereby place only an external side cylinder chamber at rest, a third state in which the tip is positioned in the cutaway portion of an internal side cylinder part to thereby place only the external side cylinder chamber and an intermediate cylinder chamber at rest, and a whole rest state in which the tip is positioned in a blade groove to thereby place all of the cylinder chambers at rest.

Abstract: A compressor has a cylindrical sealed container, a compression mechanism and a motor. The compression mechanism has a cylinder with an intake passage passing through the cylinder in the radial direction. The sealed container has a coupling member having a tip end face facing the periphery of the intake passage in the outer face of the cylinder and a base end to which an intake pipe is mounted. The tip end face of the coupling member serves as a flat sealed face. A concave groove is formed in a peripheral part around the intake passage in the outer face of the cylinder and an O ring is fitted therein. The O ring is pressed against the tip end face of the coupling member, sealing a gap between the cylinder and the coupling member.

Abstract: A refrigeration apparatus, provided with a refrigerant circuit (90) having a plurality of refrigerant circulating routes and capable of operation in a mode where the plurality of refrigerant circulating routes differ in refrigerant evaporation temperature and/or in refrigerant condensation temperature, is activated by a single scroll compressor (10) including a casing (11) in which are arranged two compression mechanisms (31, 32), thereby making it possible to accomplish install-space savings, cost-cutting, and high-efficiency operation.

Abstract: A fixed scroll (40) is provided which is made up of a first stationary-side member (41) and a second stationary-side member (46). The first stationary-side member (41) has a first stationary-side wrap (42) and a first outer peripheral part (43) encompassing the first stationary-side wrap (42). The second stationary-side member (46) has a second stationary-side wrap (47), a second outer peripheral part (48), and a third flat-plate part (49). The second stationary-side wrap (47) is formed integrally with the third flat-plate part (49). An orbiting scroll (50) is provided which has a first flat-plate part (51), a first movable-side wrap (53), a second flat-plate part (52), and a second movable-side wrap (54). The first movable-side wrap (53) is formed integrally with the first flat-plate part (51). The second movable-side wrap (54) is formed integrally with the second flat-plate part (52).

Abstract: A compressor has a cylindrical sealed container, a compression mechanism and a motor. The compression mechanism, has a cylinder with an intake passage passing through the cylinder in the radial direction. The sealed container has a coupling member having a tip end face facing the periphery of the intake passage in the outer face of the cylinder and a base end to which an intake pipe is mounted. The tip end face of the coupling member serves as a flat sealed face. A concave groove is formed in a peripheral part around the intake passage in the outer face of the cylinder and an O ring is fitted therein. The O ring is pressed against the tip end face of the coupling member, sealing a gap between the cylinder and the coupling member.

Abstract: A fixed scroll (40) is provided which is made up of a first stationary-side member (41) and a second stationary-side member (46). The first stationary-side member (41) has a first stationary-side wrap (42) and a first outer peripheral part (43) encompassing the first stationary-side wrap (42). The second stationary-side member (46) has a second stationary-side wrap (47), a second outer peripheral part (48), and a third flat-plate part (49). The second stationary-side wrap (47) is formed integrally with the third flat-plate part (49). An orbiting scroll (50) is provided which has a first flat-plate part (51), a first movable-side wrap (53), a second flat-plate part (52), and a second movable-side wrap (54). The first movable-side wrap (53) is formed integrally with the first flat-plate part (51). The second movable-side wrap (54) is formed integrally with the second flat-plate part (52).

Abstract: A refrigeration apparatus, provided with a refrigerant circuit (90) having a plurality of refrigerant circulating routes and capable of operation in a mode where the plurality of refrigerant circulating routes differ in refrigerant evaporation temperature and/or in refrigerant condensation temperature, is activated by a single scroll compressor (10) including a casing (11) in which are arranged two compression mechanisms (31, 32), thereby making it possible to accomplish install-space savings, cost-cutting, and high-efficiency operation.

Abstract: A discharge valve mechanism has a plurality of discharge openings. The discharge openings are placed in an open or closed state by a plate-like valve element. Each of the discharge openings is formed at a respective location between a base end side and a leading end side of the valve element. The number of discharge openings to be placed in the open state is varied depending on the pressure and the flow rate of gas refrigerant discharged from a compression chamber.