Abstract: A scroll-type fluid machine includes a mechanism for driving a movable scroll relative to a fixed scroll. The mechanism includes a drive shaft rotatable on a first axis, an eccentric pin and a bearing. The eccentric pin revolves around the first axis with the rotation of the drive shaft and has an outer peripheral surface centered on a second axis that is parallel to and eccentric to the first axis. The bearing is mounted to the movable scroll and has an inner peripheral surface centered on a third axis that is parallel to and eccentric to the first and second axes. The inner peripheral surface is in contact with the outer peripheral surface of the eccentric pin. Pressing force is applied to the bearing from the eccentric pin due to the arrangement of the first, second and third axes so as to press the movable scroll to the fixed scroll.

Abstract: A scroll type compressor includes a housing defining a discharge pressure region, a fixed scroll member having a fixed base plate and a fixed scroll wall, a movable scroll member having a movable base plate and a movable scroll wall, a fixed wall slidably supporting the movable scroll member, a back pressure chamber defined on a back surface side of the movable base plate. A supply passage connects the back pressure chamber to the discharge pressure region and passes through a sliding portion between the movable scroll member and the fixed wall. A clearance at the sliding portion varies in response to a position of the movable scroll member in a direction in which the movable scroll member approaches to or leaves from the fixed wall, whereby cross-sectional area of the clearance where gas passes is varied to adjust pressure in the back pressure chamber.

Abstract: A compressor has a housing, a compression mechanism and a partition member. The housing defines therein a discharge chamber. The compression mechanism is located adjacent to the discharge chamber in the housing. The partition member faces a predetermined region, which is a portion of the compression mechanism that faces the discharge chamber except a specific region where a gas discharge port opens, for restraining pressure of refrigerant gas in the discharge chamber to be applied to the predetermined region.

Abstract: A scroll type compressor includes a housing defining a discharge pressure region, a fixed scroll member having a fixed base plate and a fixed scroll wall, a movable scroll member having a movable base plate and a movable scroll wall, a fixed wall slidably supporting the movable scroll member, a back pressure chamber defined on a back surface side of the movable base plate. A supply passage connects the back pressure chamber to the discharge pressure region and passes through a sliding portion between the movable scroll member and the fixed wall. A clearance at the sliding portion varies in response to a position of the movable scroll member in a direction in which the movable scroll member approaches to or leaves from the fixed wall, whereby cross-sectional area of the clearance where gas passes is varied to adjust pressure in the back pressure chamber.

Abstract: In a motor compressor, a housing forms a fitting surface at an outer peripheral surface of the housing and a plurality of insertion holes extending through the housing at the fitting surface. A compression mechanism is accommodated in the housing. An electric motor is accommodated in the housing for driving the compression mechanism. A plurality of terminal pins transmits electric current to the electric motor. A terminal substrate is fastened to the housing by a bolt so as to be fixed to the fitting surface and forms a plurality of holes. The terminal pin is inserted into each hole of the terminal substrate while being fixedly supported on the terminal substrate so as to be insulative and airtight. The insertion holes correspond to the holes. The gasket is interposed between the fitting surface and the terminal substrate, while each terminal pin is inserted into the corresponding insertion holes.

Abstract: A compressor includes a housing that has cylinder bores. A swash plate chamber communicates to the cylinder bores and a motor chamber partitioned from the swash plate chamber. A motor is disposed in the motor chamber actuates a drive mechanism in the swash plate chamber so as to move pistons in the cylinder bores. The refrigerant gas is supplied to an interior refrigerant passage of the compressor from an external refrigerant circuit. The swash plate chamber and the motor chamber are separated in the air tight manner. The motor chamber is connected to the interior refrigerant passage by a refrigerant path.

Abstract: A scroll compressor includes a fixed scroll member fixed to a housing and a movable scroll member engaging the fixed scroll member. Each scroll member has a base plate and a spiral wall. A compression chamber between the fixed and movable scroll members reduces in volume by orbiting the movable scroll member, thus compressing gas. A back pressure chamber is defined in the housing on a back surface side of the movable scroll base plate between the movable scroll member and the a fixed wall of the housing. An introducing passage interconnects the back pressure chamber and a relatively high pressure region. A seal member on one of the movable scroll member and the fixed wall seals the back pressure chamber as being slidable on the other. The seal member includes a portion for lowering sealing performance, which interconnects the back pressure chamber and a relatively low pressure region.

Abstract: A multistage piston compressor includes a case and a suction chamber and a discharge chamber provided in the case. A rotary shaft is supported in the case. A valve plate provided in the case includes suction ports and discharge ports. A plurality of bores are provided at predetermined intervals about the axis of the shaft. Pistons are housed in the bores and compress refrigerant by reciprocating in accordance with the rotation of the shaft. An intermediate chamber connects a discharge port with a suction port. The refrigerant is compressed in stages by passing through a plurality of bores via the intermediate chamber. Compression chambers are defined between the pistons and the valve plate. A communication passage is provided for setting the pressures acting on the rear faces of the pistons to an intermediate pressure between the suction pressure and the discharge pressure.

Abstract: A single-headed piston (22) is accommodated within each of a plurality of cylinder bores (13) formed on a cylinder block (13). Shoes (23) are disposed between a swash plate (11) and each single-headed piston (22). The rotation force of the swash plate (11) is transmitted to the single-headed piston (22) via the shoes (23). Each single-headed piston (22) makes a reciprocating motion within the cylinder bore (131) accompanied by the rotation of the swash plate (11). A rotary shaft (16) fixed to the swash plate (11) is driven by a motor (21).

Abstract: In a reciprocating compressor, an adequate lubricating effect is ensured for a sliding surface between a piston and a cylinder bore, and the leakage of a refrigerant for discharge is prevented. After a lubricating oil mixed within the refrigerant is separated by an oil separator 23 on a discharge side, the separated lubricating oil is guided via an oil supply hole 29 in a cylinder block 1 to the sliding surface between the cylinder bore 12 and the piston 13 that reciprocates within the cylinder bore 12 thereof in order to lubricate the surface. In this reciprocating compressor, the intermediate axial portion of the outer circumference of the piston 13 has a small diameter in order to define an oil sump 30. The oil sump 30 is configured so as not to directly communicate with a drive chamber 7, and oil always collects within the oil sump 30.

Abstract: The object of the present invention is to offer an electric type swash plate compressor which is compact and reduced in weight and lightened, and which can efficiently cool down a motor chamber and a crank chamber. The compressor has an electric motor and a swash plate, which are respectively accommodated in the motor chamber and the crank chamber. In the compressor a communication route, which communicates a part except the discharge chamber communicating with an external refrigerant circuit in an inner refrigerant circuit within an outer casing with the motor chamber, is formed. The communication route is formed so as to pass through the crank chamber, and the refrigerant in lower temperature and lower pressure than discharge refrigerant is supplied into the motor chamber and the crank chamber. Accordingly, the improvement of cooling efficiency and the reduction of pressure resisting strength of the casing can be performed.

Abstract: A multistage piston compressor includes a case and a suction chamber and a discharge chamber provided in the case. A rotary shaft is supported in the case. A valve plate provided in the case includes suction ports and discharge ports. A plurality of bores are provided at predetermined intervals about the axis of the shaft. Pistons are housed in the bores and compress refrigerant by reciprocating in accordance with the rotation of the shaft. An intermediate chamber connects a discharge port with a suction port. The refrigerant is compressed in stages by passing through a plurality of bores via the intermediate chamber. Compression chambers are defined between the pistons and the valve plate. A communication passage is provided for setting the pressures acting on the rear faces of the pistons to an intermediate pressure between the suction pressure and the discharge pressure.

Abstract: A motor-driven compressor performs suction, compression, and discharge of refrigerant. The compressor has four cylinder bores and four pistons. A swash plate is integrally rotated with a drive shaft. A transmission mechanism transmits rotation of the swash plate to the pistons. The ratio of the discharge pressure to the suction pressure when the discharge displacement of the compressor is maximum, that is, the compression ratio, is in a range of 2 to 4.5. The compressor is constructed to permit the size of the motor to be minimized.

Abstract: In a reciprocating compressor, an adequate lubricating effect is ensured for a sliding surface between a piston and a cylinder bore, and the leakage of a refrigerant for discharge is prevented.

Abstract: Scroll compressors are taught that include an outer peripheral portion (23) of a movable scroll member (20) disposed opposite of an end face (13) of a stationary scroll member (10). At least one end portion (20, 23) has a shape that prevents contact when the movable scroll member (20) bends or deforms under high pressure. The contact avoiding shape or structure may be, for example, a tapered portion, a recessed portion or a step shaped portion.

Abstract: A compression mechanism is provided, in a casing, and operatively coupled via a drive shaft 17 to an electric motor 21 accommodated in a motor chamber 15 within the casing, so that power can be transmitted. An in-shaft bore 17A is formed in the drive shaft and a first bifurcated hole 17B is formed for communicating the in-shaft bore 17A to the motor chamber 15. The in-shaft bore 17A is communicated to the suction chamber 31 via a second collecting hole 13F, the collecting chamber 13D and a suction communication hole 13G formed in a cylinder block 13. Thereby, part of the refrigerant sucked in the casing is introduced to the compression mechanism through a gap between a stator 19 and a rotor 20, and the remainder of the refrigerant is introduced to the compression mechanism without being used for cooling the electric motor 21.

Abstract: A compressor includes a housing that has cylinder bores. A swash plate chamber communicates to the cylinder bores and a motor chamber partitioned from the swash plate chamber. A motor is disposed in the motor chamber actuates a drive mechanism in the swash plate chamber so as to move pistons in the cylinder bores. The refrigerant gas is supplied to an interior refrigerant passage of the compressor from an external refrigerant circuit. The swash plate chamber and the motor chamber are separated in the air tight manner. The motor chamber is connected to the interior refrigerant passage by a refrigerant path.

Abstract: A motor-driven compressor performs suction, compression, and discharge of refrigerant. The compressor has four cylinder bores and four pistons. A swash plate is integrally rotated with a drive shaft. A transmission mechanism transmits rotation of the swash plate to the pistons. The ratio of the discharge pressure to the suction pressure when the discharge displacement of the compressor is maximum, that is, the compression ratio, is in a range of 2 to 4.5. The compressor is constructed to permit the sie of the motor to be minimized.

Abstract: The object of the present invention is to offer an electric type swash plate compressor which is compact and reduced in weight and lightened, and which can efficiently cool down a motor chamber and a crank chamber.

Abstract: Scroll compressors are taught that include an outer peripheral portion (23) of a movable scroll member (20) disposed opposite of an end face (13) of a stationary scroll member (10). At least one end portion (20, 23) has a shape that prevents contact when the movable scroll member (20) bends or deforms under high pressure. The contact avoiding shape or structure may be, for example, a tapered portion, a recessed portion or a step shaped portion.