Abstract: A compressor used in a refrigerating cycle is provided as a miniaturized and lightweight unit at low production cost by selecting an optimal material to constitute components or by forming the housing in a specific shape so as to allow the components to have smaller wall thicknesses while assuring sufficient strength. A tough material achieving a tensile strength greater than 800 N/mm2 is used when forming at least one of the components constituting the housing and the internal mechanisms. In addition, over the area of the housing where the bottom surface and the inner circumferential surface connect with each other, the bottom surface forms an R-shaped portion and the inner circumferential surface forms a sloping portion or an R-shaped portion.

Abstract: A gasket (10) used in a compressor in which a gas is force-fed, improve the sealability and contribute stored miniaturization of the compressor. The gasket (10) includes a raised portion (35) rising so as to surround a sealed portion. An end (43) of the raised portion (37) and a base surface (30) of the gasket (10) are not positioned on a single plane. In addition, the raised portion (35) is constituted with a flat surface (40) set at a height different from the height of the base surface (30) and an inclined surface (41) with a predetermined angle of inclination connecting the flat surface (40) with the base surface (30).

Abstract: A compressor used in a refrigerating cycle is provided as a miniaturized and lightweight unit at low production cost by selecting an optimal material to constitute components or by forming the housing in a specific shape so as to allow the components to have smaller wall thicknesses while assuring sufficient strength. A tough material achieving a tensile strength greater than 800 N/mm2 is used when forming at least one of the components constituting the housing and the internal mechanisms. In addition, over the area of the housing where the bottom surface and the inner circumferential surface connect with each other, the bottom surface forms an R-shaped portion and the inner circumferential surface forms a sloping portion or an R-shaped portion.

Abstract: A swash plate type variable capacity compressor which is a compressor (10) to be used for a supercritical refrigerating cycle (1) and provided with a swash plate (400) which is disposed rotatably, a piston (500) which is coupled with the swash plate and a cylinder (600) which holds the piston movably, the cylinder is provided with a suction valve (150) for sucking a refrigerant of the supercritical refrigerating cycle and a discharge valve (160) for discharging the refrigerant, wherein the suction valve has valve bodies (152) having flexibility attached to suction ports (141) for sucking the refrigerant, and the swash plate type variable capacity compressor has the valve bodies press-contacted in an elastically deformed state against the valve seats of the suction ports to decrease the number of rotations of the swash plate when the refrigerant is started to be compressed.

Abstract: A supercritical refrigeration cycle using CO2 for a refrigerant and having a pressure exceeding the critical point of the refrigerant on a high-pressure side, wherein: the supercritical refrigeration cycle allows the refrigerant and a part of a lubricating oil to circulate, and the lubricating oil used does not contain an epoxy-based oxygen scavenger or an additive which is thermally decomposed on the high-pressure side and its decomposed components make a chemical reaction to produce a compound having low solubility to the refrigerant so as to prevent a deposit from being produced at a portion where the refrigerant is decompressed.

Abstract: A swash plate compressor includes a cylinder block, a shaft rotatably supported in a central portion of the cylinder block a swash plate which rotates along with rotation of the shaft a crankcase for retaining the swash plate, and pistons each connected to the swash plate and sliding in a corresponding one of the cylinder bores as the swash plate rotates. Each of the pistons includes a hollow cylindrical portion for sliding within the cylinder bore and a bridge for rollably supporting the pair of shoes. The bridge projects radially outward with respect to the hollow cylindrical portion. The cylinder block is formed with a projecting portion projecting from a central portion of a front end face thereof toward the crankcase, within a range limited such that the projecting portion does not interfere with the connecting portion.

Abstract: A swash plate compressor including a housing secured to a cylinder block having cylinder bores axially formed therethrough for receiving respective pistons therein. A swash plate is mounted on a drive shaft extending through a crankcase defined within the housing, for rotation in unison with the drive shaft. The swash plate has sliding surfaces on opposite sides thereof. A pair of shoes, each of which has a substantially semispherical shape, which slide on the sliding surfaces of the swash plate. Each piston is connected to the swash plate via a corresponding pair of the shoes, and performs a linear reciprocating motion within a corresponding cylinder bore. Guide grooves are each axially formed in an inner peripheral wall of the housing along a path of the linear reciprocating motion of the corresponding piston.

Abstract: An expansion device capable of preventing an abnormal increase in the high-pressure in a freezing cycle and having, as an integrated unit thereof, a mechanism capable of quickly responding to an abnormal increase in the high-pressure and the low-pressure is provided. A means for displacement (bellows) 28 which becomes displaced in correspondence to the high-pressure is linked to a valve element 24 of a restrictor valve mechanism 32 to displace a rod 34 provided with a safety valve mechanism 33.

Abstract: In a freezing cycle, if the pressure in a high-pressure line (8) reaches an abnormal level, the high-side pressure is released toward a low-pressure line (9) to lower the pressure without releasing the coolant into the atmosphere and the coolant is released into the atmosphere only when the pressure in the low-pressure line (9) reaches an abnormal level.

Abstract: The freezing cycle according to the present invention is provided with a first means for safety that leaks the high pressure to the low-pressure side when the high pressure reaches a level equal to or higher than a first specific pressure, a second means for safety that releases the high pressure into the atmosphere when the high pressure reaches a level equal to or higher than a second specific pressure, a third means for safety that stops the operation of the compressor when the high pressure reaches a level equal to or lower than a third specific pressure and a fourth means for safety that releases the low-pressure into the atmosphere when the low-pressure reaches a level equal to or higher than a specific pressure. In addition, a splash-preventing film is formed over specific areas of devices constituting the freezing cycle.

Abstract: In a freezing cycle that utilizes a supercritical fluid as its coolant and employs an internal heat exchanger that performs heat exchange on the coolant on the outlet side of a gas cooler and on the intake side of a compressor, a means for adjustment that adjusts the quantity of heat exchange performed by the internal heat exchanger (4) is provided. The means for adjustment is constituted of a bypass passage (9) that bypasses the internal heat exchanger (4) and a flow-regulating valve (10) that adjusts the coolant flow rate in the bypass passage (9). The flow-regulating valve (10) is constituted of an electromagnetic valve, the degree of openness of which is determined based upon information with respect to the cycle state, or a bellows regulating valve that operates in correspondence to the pressure on the high-pressure side. Alternatively, the means for adjustment may perform adjustment by varying the passage length over which heat exchange is performed by the internal heat exchanger (4).

Abstract: In order to achieve an improvement in the efficiency of a refrigerating cycle and achieve quick and precise response to changes in the environment or the operating state while using carbon dioxide as a coolant, the refrigerating cycle according to the present invention is provided with a first expander and a second expander and further with a vapor-liquid separator provided between the first and second expanders. The components are arranged such that pressure of a vapor-phase coolant at high pressure, compressed by a compressor and cooled by a radiator, is reduced to an intermediate pressure level in a vapor-liquid two-phase range by the first expander. Then the coolant in a condition of a vapor-liquid mix is separated into a vapor-phase coolant by the vapor-liquid separator, so that only the liquid-phase coolant is expanded by the second expander, so that the vapor-phase coolant is taken into the intake side of the compressor while maintaining the intermediate pressure level.

Abstract: A swash plate compressor is provided. The swash plate has sliding surfaces on opposite sides thereof. Pairs of shoes, each of which has a substantially semispherical shape, slide on the sliding surfaces of the swash plate. Each piston is connected to the swash plate via a corresponding pair of the shoes. Guide grooves are each axially formed in an inner peripheral wall of the housing along a path of the linear reciprocating motion of the corresponding piston. Each piston has a body having a first concave portion for supporting a corresponding pair of the shoes, a swash plate-side end having a second concave portion for supporting another of the corresponding pair of the shoes, and a bridge integrally connecting the body and the swash plate-side end such that these portions are axially opposed to each other with space therebetween. The bridge extends radially outward with respect to an outer peripheral surface of the body, and is slidably fitted in a corresponding guide groove.

Abstract: A refrigerant compressor is provided. A cylinder block has a plurality of cylinder bores axially formed therethrough. A plurality of pistons are slidably received in the cylinder bores, respectively. A housing is secured to the cylinder block and has a crankcase defined therein. A drive shaft extends through the crankcase and has one end on a cylinder block side. A torque-transmitting member is received within the crankcase and mounted on the drive shaft, for rotation in unison with the drive shaft for converting torque transmitted from the drive shaft into reciprocating motion of each of the pistons. A bearing supports the one end of the drive shaft.

Abstract: PurposeTo provide a refrigeration cycle capacity enhancement apparatus that, in addition to lowering the temperature of coolant going from a condenser 4 to an evaporator 7, raising the temperature of coolant going from the evaporator 7 to a compressor 3, enhancing the performance thereof, and preventing the return of liquid coolant to the compressor 3, can also keep the pressure on the coolant from becoming higher and higher under high loading.ConstitutionTaking note of the fact that the capacity of a heat exchanger 5 is raised by combining drain water D from an evaporator 7 with the heat exchanger 5, this is a refrigeration cycle capacity enhancement apparatus that comprises a compressor 3 and a condenser 4 installed on the engine compartment 12 side of a vehicle, and an evaporator 7 installed on the vehicle cabin 13 side thereof.