Abstract: A defroster restrains a vane jump that takes place when an evaporator is defrosted in a refrigerant circuit using a so-called internal intermediate-pressure type double-stage compression rotary compressor. The defroster includes a rotary compressor that discharges a refrigerant gas that has been compressed by a first rotary compressing unit into a hermetic vessel and further compresses the discharged intermediate-pressure refrigerant gas, a gas cooler, an expansion valve, and an evaporator. To defrost the evaporator, the refrigerant gas discharged from the second rotary compressing unit is introduced into the evaporator without decompressing it by the expansion valve. Furthermore, the refrigerant gas discharged from the first rotary compressing unit is introduced into the evaporator. At the same time, an electromotive unit of the rotary compressor is run at a predetermined number of revolutions.

Abstract: A multi-stage compression type rotary compressor 10 is provided with an electrical-power element 14, the first and second rotary compression elements 32, 34 driven by a rotary shaft 16 of the electrical-power element 14 in a sealed vessel 12. The refrigerant compressed by the first rotary compression element 32 is compressed by the second rotary compression element 34. The refrigerant is combustible. The refrigerant compressed by the first rotary compression element 32 is discharged to the sealed vessel 12. The discharged medium pressure refrigerant is compressed by the second rotary compression element 34. Additionally, the displacement volume ratio of the second rotary compression element 34 to the first rotary compression element 32 is set not less than 60% and not more than 90%. By using the multi-stage compression type rotary compressor, a rotary compressor using a combustible refrigerant can be carried out.

Abstract: A double-cylinder two-stage compression rotary compressor (10) comprising a first and a second compressors (32 , 34), driven by an electric motor (14), all accommodated in a sealed container (12). The first and the second compressor (32, 34) have respective first and second cylinders (40, 42) accommodating first and second rollers (48, 50), fitted on respective first and second eccentric cams (44, 46). The inner spaces of the first and second cylinders are partitioned by respective first and second vanes (52, 54) to form suction spaces and compression spaces. The two cylinders are separated by an intermediate partition panel (38), which has a central bore (36) for passing therethrough a shaft (16) of the motor (14).

Abstract: Expansible chamber apparatus for a positive displacement, high volume, low friction, reversible rotary pump for gases and/or liquids. Two or more chambers are provided, defined in part by one or more small abutments that move radially in a slot to switch or redirect fluid flow with minimal loss of fluid mechanical energy. A complementary pair of chambers, formed by a single groove, is radially divided by a concentric land ring and is longitudinally segmented by the abutment, which seals the chambers against reverse leakage. The abutment is slightly smaller in radial dimension than the groove and is floated to avoid hard contact with the inner and outer land ring surfaces of the groove by a balancing of the Bernoulli effects that develop. The apparatus can also be operated as a fluid compressor, as a motor and in other applications, in single cycle or multiple cycle operation. The pump provides substantially non-pulsating fluid flow in one or more stages.

Abstract: An object of the present invention is to provide a method for manufacturing a multi-stage compression type rotary compressor which can avoid the replacement of parts to be used as much as possible to reduce costs and also which enables easily setting an appropriate displacement volume ratio while preventing-the compressor from being increased in size. The gist of the present invention is that an inner diameter of a lower cylinder is altered without altering its thickness (or height), and a displacement volume ratio between first and second rotary compression elements is set to an optimum value in accordance with the alteration.

Abstract: A double-cylinder two-stage compression rotary compressor (10) comprising a first and a second compressors (32, 34), driven by an electric motor (14), all accommodated in a sealed container (12). The first and the second compressor (32, 34) have respective first and second cylinders (40, 42) accommodating first and second rollers (48, 50), fitted on respective first and second eccentric cams (44, 46). The inner spaces of the first and second cylinders are partitioned by respective first and second vanes (52, 54) to form suction spaces and compression spaces. The two cylinders are separated by an intermediate partition panel (38), which has a central bore (36) for passing therethrough a shaft (16) of the motor (14).

Abstract: A two-cylinder type two-stage compression rotary compressor has an electric motor portion in a closed container and upper and lower cylinders driven by a rotating shaft of the electric motor portion; the insides of the respective cylinders are partitioned by upper and lower vanes and upper and lower rollers which are fitted to upper and lower eccentric portions provided to the rotating shaft to eccentrically rotate in the upper and lower cylinders; a lower stage side compression portion for sucking and compressing a refrigerant gas to be discharged, a high stage compression portion, and an intermediate partition plate provided between the both compression portions to insert the rotating shaft therethrough are included; the upper and lower eccentric portions provided to the rotating shaft have a phase difference of 180 degrees; a connecting portion for connecting the both eccentric portions has such a non-circular cross-sectional shape such as that the thickness in a direction orthogonal to an eccentric direct

Abstract: A multi-rotor type compressor including plural compression elements each of which includes a rotor eccentrically rotating in a cylinder and a vane which is in sliding contact with the outer peripheral surface of the rotor and partitions the inside space of the cylinder into a suck-in space in which a suck-in operation is performed and a compression space in which a compressing operation is performed, and a power save mechanism including an intercommunication path through which the compression space of a compression element is allowed to intercommunicate with the suck-in space of another compression element at a predetermined phase, an interception valve for intercepting flow of fluid in the intercommunication path, and a check valve which is provided in the intercommunication path and allows the fluid to flow therethrough in only one direction. The compression may be equipped in an air conditioner.

Abstract: A variable capacity rotary compressor (12) having a housing (14) with a cylindrical chamber (16) and an orbiting ring piston (26) in the chamber. A pair of outer vanes (20) slidably mount in the housing and are biased into engagement with the orbiting ring (26), forming a pair of gas chambers (27). A pair of vane deactivation assemblies (52) each include a deactivation pin (58) which engages a deactivation recess (60) in its respective outer vane (20) when a corresponding one or both solenoid actuators (54) are energized. The pins (58) hold the outer vanes (20) in a retracted position out of contact with the orbiting ring (26), thus reducing the capacity of the compressor (12). Each outer vane (20) includes a slotted recess (62) adjacent to its deactivation recess (60) in order to allow for plastic yielding of the vane (20) behind the deactivation recess (60) without the yielded material interfering with the sliding motion of the outer vanes (20) relative to the walls of corresponding vane slots (18).

Abstract: A drilling motor has been developed with a hollow tubular stator having at least one rod recess therein and an inlet port therethrough corresponding to each of the at least one rod recess; a rod movably disposed in each of the at least one rod recess; a tubular rotor movably disposed within the stator for rotation therein, the tubular rotor having a central motive fluid flow channel therethrough and extending along the length of the rotor, the rotor having one or more radial exhaust flow channels therethrough for providing a motive fluid flow path to the central motive fluid flow channel from at least one action chamber between the hollow tubular stator and tubular rotor; the tubular rotor having at least one rotor seal; and the at least one action chamber defined by an interior surface of the hollow tubular stator and an exterior surface of the tubular rotor, each of the at least one action chamber sealed at one end by the rod and at another end by one of the at least one rotor seals.

Abstract: A rolling-piston expander has a hermetic casing 7 provided with a suction pipe 3 and a discharge pipe 5, a cylinder 13 disposed in the casing, a roller 31 eccentrically rotated in the cylinder, an expansion chamber 39 defined by the roller and communicating with a suction port 47 and a discharge port 55, a shaft 19 for supporting the roller so that the roller may eccentrically rotate, a suction timing controller 51 consisting of the ports 47 and 51, for controlling the timing of the supply of gas into the expansion chamber, and a bypass for supplying high-pressure gas into the expansion chamber when the suction timing is off.

Abstract: A multicylinder rotary compressor capable of performing high performance capacity control operation without the need for an external piping or for a thicker partition plate which leads to a taller rotary compressing element or a longer bearing span of a bearing. The multicylinder rotary compressor has a rotary compressing element housed in a hermetic enclosure; wherein the rotary compressing element is equipped with an intermediate partition plate, a cylinder provided on each side of the partition plate, a rotary shaft having eccentric sections which are shifted relative to each other by 180 degrees in the direction of shaft rotation, rollers fitted onto the eccentric sections of the rotary shaft and which rotate in the cylinders, and bearings which seal the cylinders.

Abstract: A fluid conveying device in accordance with the invention includes a housing having an inlet forming a suction side and an outlet forming a pressure side, a cylindrical pumping chamber with intake and discharge openings at opposite sides which respectively are in fluid communication with the suction side and the pressure side and a rotor contained in the chamber having a hollow rotor body mounted for eccentric rotation relative to an axis of the chamber.

Abstract: A drilling motor has been developed with a hollow tubular stator having at least one rod recess therein and an exhaust port therethrough corresponding to each of the at least one rod recess; a rod movably disposed in each of the at least one rod recess; a tubular rotor movably disposed within the stator for rotation therein, the tubular rotor having a central motive fluid flow channel therethrough and extending along the length of the rotor, the rotor having one or more radial flow channels therethrough for providing a motive fluid flow path from the central motive fluid flow channel to at least one action chamber between the hollow tubular stator and tubular rotor; the tubular rotor having at least one rotor seal; and the at least one action chamber defined by an interior surface of the hollow tubular stator and an exterior surface of the tubular rotor, each of the at least one action chamber sealed at one end by the rod and at another end by one of the at least one rotor seals.

Abstract: A rolling piston type compressor of a simplified design having a single rolling piston, capable of reducing a variation in torque. The compressor has a housing in which a rolling piston 42 is arranged so that an orbital movement of the rolling piston is obtained about the axis of a crankshaft 5, so that a first operating chamber 40 is formed between the rolling piston 42 and the housing. A cylindrical pillar 47 which is stationary is arranged in the rolling piston, so that a second operating chamber is formed between the rolling piston and the pillar. The medium compressed in the first operating chamber is introduced into the second operating chamber for obtaining two step compression.

Abstract: A clutch apparatus for a rotary compressor for an air conditioning system is disclosed including a crankshaft, an eccentric for engaging an orbiting ring within the compressor, and a plunger disposed within the crankshaft. The apparatus further includes a device for axially reciprocating the plunger in the crankshaft so as to cause engagement and disengagement of the plunger into the eccentric whereby the crankshaft transmits torque to the eccentric to rotate the orbiting ring within the compressor.

Abstract: A motor and a low and a high pressure stage compression element which are driven by the motor are disposed in a closed container so as to constitute a rolling piston type rotary compression mechanism in which the discharge side of the low pressure stage compression element is communicated with the suction side of the high pressure stage compression element by way of a communication passage, and coolant compressed by said high pressure stage compression element is discharged into the closed container so as to define a discharge gas passage for cooling the motor, and the cylinder volume of the high pressure stage compression element is set to 45 to 65% of that of said low pressure stage compression element while the compression timing of the high pressure stage compression element is delayed by an angle of 60 to 80 deg.

Abstract: A multiple stage rotary compressor having a housing with a pump cavity, an orbiting ring piston in the cavity, a cylindrical post carried by the housing within the orbiting ring, a pair of vanes engaging the outer surface of the orbiting ring to define a pair of primary pumping chambers in the cavity and a second pair of internal vanes contacting the inner surface of the orbiting ring to define a pair of secondary pumping chambers and a capacity controller adapted to selectively disable each of the outer vanes to establish differing compressor pump capacities depending upon the operating requirements of the compressor.

Abstract: A multi-stage rotary type compressor is constituted in such a manner that an electric motor and a plurality of compression elements to be driven by the electric motor are disposed in a closed container and the compression elements thus-disposed are sequentially connected in series. The compressor thus-constituted is arranged in such a manner that the space in the closed container is filled with the pressure discharged from the final stage. Furthermore, lubricating oil, the pressure of which is equivalent to the level of the pressure discharged from each compression element, is introduced into a back side chamber of a vane of each compression element to urge the back side of each vane with the pressure of lubricating oil. As a result, the wear of the tip end of the vane and the input loss are prevented. Therefore, satisfactory durability and compression efficiency can be obtained.

Abstract: A gas compressor includes a housing defining a compression chamber, a crankshaft having an eccentric surface radially offset from the axis of rotation of the crankshaft, an orbiting ring rotatably mounted on the eccentric for rotation about an axis offset from the shaft axis, a cylindrical post coaxial with the axis of the housing passages for carrying gas to and from the compression chamber, vanes movable radially with respect to the orbiting ring, and pressure sensitive valves that open exhaust passages from the compression chamber. The orbiting ring rotates in continual contact with the inner surface of the housing and the outer surface of the cylindrical post. Compression occurs within a first stage space and a second stage space, each space divided into compression chambers by the sliding vanes and contact between the ring and post or between the ring and housing.

Abstract: A gas compressor includes a housing defining a compression chamber, a crankshaft having an eccentric surface radially offset from the axis of rotation of the crankshaft, an orbiting ring rotatably mounted on the eccentric for rotation about an axis offset from the shaft axis, a cylindrical post coaxial with the axis of the housing passages for carrying gas to and from the compression chamber, vanes movable radially with respect to the orbiting ring, and pressure sensitive valves that open exhaust passages from the compression chamber. The orbiting ring rotates in continual contact with the inner surface of the housing and the outer surface of the cylindrical post. Compression occurs within a first stage space and a second stage space, each space divided into compression chambers by the sliding vanes and contact between the ring and post or between the ring and housing.

Abstract: The compressor comprises four stages of compression. It has four compression chambers within four, separate compartments removably bolted to a central, supporting, gear housing. In the compression chambers are rotary (rolling) pistons. A pair of parallel, gear-driven shafts journalled in the housing have eccentric pins on ends thereof. The pins intrude into the chambers and rotatably carry the rotary pistons thereon. Conduits traverse the compartments to inject water into the chambers for cooling, sealing, and lubrication of the rotary pistons. Too, the compartments conduct compressed gas therethrough from the compression chambers, and conduct coolant therethrough as well to heat exchange with the compressed gas product.

Abstract: A rotary piston type fluid machine comprises one or more rotary piston type fluid machine units, each comprising a doughnut type ring-shaped cylinder with an annular slit being provided in the wall at the inward periphery lying in a plane containing the annular central line of the cylinder, a rotor rotatively supported by the cylinder with the peripheral portion being shiftably received within the slit, one or more rotary pistons secured to the peripheral surface of the rotor and adapted to be shifted within the cylinder, and one or more gate valves mounted to the cylinder so as to cross the cylinder and adapted to periodically protrude into the cylinder in synchronization with the movement of the rotary pistons. The rotary piston type fluid machine unit can be utilized as a compressor, an internal combustion engine, a pump, etc. by using it singly, or as a number of the units in combination.

Abstract: A rotating ring rotary compressor having a driven eccentric so mounted on the drive shaft that its eccentricity is adjustable from a minimum to a maximum, whereby at its maximum extension it presses the roller surface against the stator surface to cause it to roll around the stator with zero clearance and positive hermetic sealing. Because the extensible eccentric mounting is spring-biased, the resultant working pressure is controlled by the contribution of the spring bias to centrifugal force and any excess of pressure or interference causes the roller to reduce eccentricity, thereby internally bypassing excess pressure or overcoming interference.