Abstract: Provided is a scroll compressor which has a reduced noise vibration by minimizing an impact sound generated when the operation of the scroll compressor is stopped.

Abstract: A co-rotating scroll compressor is provided in which a bearing configured to support a scroll is displaced by a torque repulsive force, which is applied to the bearing due to compression repulsion of a compressed fluid, the torque repulsive force is converted into a sealing force of compression chambers, which are defined by wraps of co-rotating scrolls such that the sealing force of the compression chambers is increased, and in which a bearing housing is rotatably installed in a housing accommodation hole, a rotational center of a second scroll is positioned at a position eccentric from a rotational center of a bearing housing, the bearing housing is rotated by the torque repulsive force applied to the second scroll, some of the torque repulsive force is converted into the sealing force against a sealing disturbing force.

Abstract: A scroll compressor is provided that may include a first scroll provided with a discharge port, a second scroll engaged with the first scroll to form a first compression chamber and a second compression chamber, and a rotational shaft provided with an eccentric portion eccentrically coupled to the first scroll or the second scroll The eccentric portion may overlap the first and second compression chambers in a radial direction. The discharge port may be provided with at least one discharge inlet and a discharge outlet The at least one discharge inlet may include a plurality of discharge inlets, which have different areas from each other, whereby a refrigerant of each compression chamber may be smoothly discharged, thereby preventing an over-compression loss due to a delay of discharge.

Abstract: A scroll compressor includes a rotation shaft, a fixed scroll, a movable scroll, a compression chamber, and a shaft support. A movable member is movable in an axial direction of the rotation shaft toward and away from the movable scroll. A rotation restriction mechanism includes a pin and a hole that is loosely fitted into the hole. An orbital radius switching mechanism moves the movable member in a first direction when a rotation speed of the rotation shaft is increased, which decreases an orbital radius of the pin relative to the hole so that an orbital radius of the movable scroll is decreased, and moves the movable member in a second direction when the rotation speed of the rotation shaft is decreased, which increases the orbital radius of the pin relative to the hole so that the orbital radius of the movable scroll is increased.

Abstract: Kinematics of a rotary piston engine are guided by a sliding guidance mechanism mounted in a biangular piston. The mechanism is arranged relative to a fixed point of a housing having a runway formed with a single-arc trochoid. A sliding component moves within a groove in the piston. A housing-mounted pin is coupled to the sliding component and defines a rotating radius during motion relative to the piston. The piston has a minimal opening in a sidewall for the pin to couple to the sliding component allowing a maximal portion of the piston to be available for lateral fluid exchange during piston movement.

Abstract: When a compressor is restarted at the time of occurrence of an inverter trip after a retry waiting time which is preliminarily set so as to lower a pressure on a discharge side of a main body of the compressor to a pressure where the main body of the compressor can be restarted elapses, conditions when the inverter trip occurs are detected and restarting is performed in accordance with the detected conditions after the retry waiting times which are different from each other elapse. There are provided two or more kinds of retry waiting times, and the retry waiting time immediately after starting is made shorter than the others. Accordingly, the present invention provides a control method and a control apparatus of an inverter compressor in which when a trip occurs immediately after the inverter is started, retry can be performed in a short time.

Abstract: A scroll compressor assembly includes a shaft having an eccentric pin that orbits a first scroll member relative to a second scroll member. The eccentric pin has a length extending from a base end to a distal end, which defines a contact area having a slight crown that engages a slider block. The contact area is moved toward the distal end of the eccentric pin to improve the stability of at least one of the first and second scroll members.

Abstract: A slider block for a scroll compressor has a recess formed in a wall between a flat portion on the outer surface and a chamfer formed on the inner surface. The recess eliminates a high stress area of the prior art, and reduces cracks originating from this area of the slider block.

Abstract: A scroll compressor is provided with structure between its slider block and its eccentric pin that allows relative movement, but limits such movement. In one embodiment, a spring biased piston resists relative movement between the slider block and the eccentric pin. In another embodiment, incrementally spaced indexed surfaces are defined. With either embodiment the amount of relative movement of the slider block is limited relative to the eccentric pin and hence between the wraps of the orbiting scrolls. This will result in quieter operation.

Abstract: A number of embodiments are disclosed in which scroll compressor elements are actuated upon a particular condition being sensed within the scroll compressor. Upon the condition being sensed, elements are actuated which restrict the orbit radius of the orbiting scroll. In this way, conditions such as low charge, reverse rotation, and low suction pressure are encountered with little damage to the scroll compressor.

Abstract: A double screw rotor assembly includes two screw rotors meshed in a bushing inside a casing. The threads of the screw rotors have a constant pitch, and define with the bushing a plurality of air chambers in the pitch. The volumes of the air chambers reduce gradually from the inlet toward the outlet due to reduced tooth height so that the outer diameter defined by the tooth tip of the thread of each screw rotor has the shape of an invertedly disposed cone. An electric driving device is controlled to move the bushing axially in the casing relative to the screw rotors in adjusting the clearance between the inside wall of the bushing and the tooth tip of the thread of each screw rotor, so as to minimize the consumption of starting power and facilitate stable running of the screw rotors, Further, a O-ring is provided at the top wall of the busing and pressed on the casing to keep an airtight status, so as to improve the working efficiency.

Abstract: A trochoidal gear pump or engine uses a coaxial hub with the outer and/or inner rotor and an associated rolling element bearing assembly that preferably uses pre-loaded bearings to precisely set the rotational axis and/or the axial position of the rotor with which it is associated. This allows the fixed-gap clearance between the rotor surfaces and the housing surfaces or the other rotor surfaces to be set at a distance that minimizes operating fluid shear forces and/or by-pass leakage and eliminates gear tooth wear thus preserving effective chamber to chamber sealing. The device is useful in handling gaseous and two-phase fluids in expansion/contracting fluid engines/compressors and can incorporate an output shaft that accommodates an integrated condensate pump for use with Rankine cycles. A vent from the housing cavity to a lower pressure input or output port regulates built-up fluid pressure in the housing thereby optimizing the efficiency of the device by controlling bypass leakage.

Abstract: In a scroll type compressor in which a compression mechanism compresses a gaseous fluid with moving the gaseous fluid along a spiral path to produce a compressed gas, an escaping path is provided for escaping the compressed gas from the compression mechanism at an intermediate portion of the spiral path. A pressure transmission path transmits pressure of the compressed gas to a valve mechanism which is for controlling an open and an close of the escaping path. The pressure transmission path has a delay mechanism for delaying transmission of a change of the pressure to the valve mechanism.

Abstract: A scroll type compressor having a front housing, a rear housing, an intermediate outer shell portion arranged between the front and rear housing to form an integral stationary scroll element having a stationary end plate and a stationary spiral member, a movable scroll element having a movable end plate and a movable spiral element and being engaged with the stationary scroll element to define a plurality of compression chambers shifting and reducing in volume to compress refrigerant gas, containing therein an oil component, in response to an orbiting motion of the movable scroll element, a suction port formed in the intermediate outer shell portion to directly introduce the refrigerant gas into the compression chambers, and a discharge chamber in which the refrigerant gas after compression is discharged from the compression chambers.

Abstract: A scroll compressor comprising a fixed scroll, a rotating scroll, a compliant frame for supporting the rotating scroll in an axial direction and a main shaft for driving the rotating scroll in directions of radiuses of the rotating scroll, and a guide frame fixed to a hermetically sealed vessel for supporting the compliant frame in the directions of its radiuses, wherein the rotating scroll is slidable in the axial direction by sliding of the compliant frame on the guide frame; a space is formed between the compliant frame and the guide frame; and a pressure in the space is made to be a pressure higher than a suction pressure and the same as a discharge pressure or less, whereby relief of the rotating scroll is avoidable to quickly and constantly realize a state of normal operation.

Abstract: A scroll compressor has a wedge camming device operable between the orbiting scroll of the scroll compressor and a fixed wall forming part of the compressor, for the purposes of automatically engaging the wall and the orbiting scroll upon reverse operation of the compressor to thereby separate the wraps of orbiting and non-orbiting scroll during such reverse operation. Damage to the compressor in the event of powered reverse is also prevented.

Abstract: A scroll-type compressor has a scroll plate that is prevented from moving radially or rotating but may be axially displaced. The configuration includes a key and key way configuration and springs to axially bias one scroll plate away from the other scroll plate. The major components of the compressor assembly can be axially assembled.

Abstract: A scroll compressor has a wedge camming device operable between the orbiting scroll of the scroll compressor and a fixed wall forming part of the compressor, for the purposes of automatically engaging the wall and the orbiting scroll upon reverse operation of the compressor to thereby separate the wraps of orbiting and non-orbiting scroll during such reverse operation. Damage to the compressor in the event of powered reverse is also prevented.

Abstract: A scroll type compressor using a crank mechanism having enough freedom so that an amount of eccentricity of the movable scroll member becomes variable. An elastic body is inserted between the facing surfaces striking each other in the inside of the crank mechanism so as to prevent generation of a noise due to the collision of the parts when starting up or shutting down the compressor.

Abstract: A scroll compressor having a driving shaft 6, on which a bushing 10 and a balancing weight 9 are supported. The drive shaft 6 includes, at its end, a drive projection 6a, which is engaged with a driven groove 10a formed in the bushing 10. A spring 20 is arranged between the drive projection 6a and the bushing 10 for urging the latter radially inwardly to reduce the radius of the orbital movement of the bushing 10. A centrifugal force generated in the bushing when the drive shaft 6 is rotated causes the bushing 10 to be moved radially outwardly to increasing the radius of the orbital movement of the bushing 10.

Abstract: A scroll compressor comprising a rotation constraining device for restricting the rotation of the orbital scroll toward the principal axis rotational direction and for extending the constraining range of the orbital scroll toward the principal axis reverse rotational direction, and a compression chamber torque forming device for causing a pressure in a first compression chamber to be larger than that in a second compression chamber when the pressure in the compression chambers rises up abnormally high. The first compression chamber is formed between the wrap member inside surface of the fixed scroll and the wrap member outside surface of the orbital scroll and the second compression chamber is formed between the wrap member outside surface of the fixed scroll and the wrap member inside surface of the orbital scroll.

Abstract: In a scroll compressor, under conditions favoring reverse operation, the scroll wraps are separated so as to provide a continuous, unimpeded path through the scrolls. Spring bias, a repositioning of driving contact areas and/or force areas can be used singly or in combination to cause separation of the wraps.

Abstract: This invention relates to the prevention of leakage caused by the gap between the tip member of a scroll wrap and the end plate of the other scroll, and the axial leakage apparatus of a scroll compressor for reducing the power loss caused due to the use of the compressed refrigerant gas at the time of the prevention of leakage, which is accomplished by the axial leakage resistant apparatus of a scroll compressor including the pressurization member to pressurize the fixed scroll toward the lower shaft of the crankshaft with a part of the refrigerant gas of high pressure exhaled into the exhalation chamber and the control member to control the compression interval of the fixed scroll by the pressurization of the above pressurization member.

Abstract: A scroll compressor comprises a stationary scroll and an orbiting scroll driven by a shaft. The shaft has an eccentric pin disposed in a slot of a bushing which is mounted in the orbiting scroll. A weight is mounted for rotation with the shaft for generating a centrifugal force which is transmitted to the orbiting scroll to counterbalance a centrifugal force generated by the orbiting scroll, and thereby reduce the pressure with which the orbiting scroll bears against the stationary scroll. The weight is movable radially with respect to both the bushing and the shaft, and a spring is radially interposed between the weight and the bushing for transmitting force therebetween.

Abstract: A scroll type compressor which prevents occurrence of abnormally high pressures due to liquid compression at the time of startup so as to lighten the engine load by providing a projection on the end face of the shaft and a groove in which the projection fits in the end face of the bush supporting a movable scroll member, the projection and groove being arranged so that their abutting faces are inclined a predetermined angle with respect to a line connecting the center of the shaft and the center of the bush in the direction opposite to the rotational direction of the shaft and being positioned relative to each other so that the extension line of the abutting faces passes through the side opposite to the side where the center of the bush is positioned seen from the center of the shaft.

Abstract: A scroll type fluid displacement machine (10) with a housing (12) a fluid inlet port (78) and a fluid outlet port (76) has an annular piston (88) that biases the balls (90) of the ball coupler and the orbital scroll (29) toward the fixed scroll (18) to move the axial tips (40 and 58) of the wraps (34 and 52) into sealing contact with the end plates (30 and 48) when fluid is pumped into the annular chamber (120). A control system (28) is provided to control the axial position of the orbital scroll (20). The control system (28) includes a solenoid valve (176) which directs fluid from a small trigger compressor (174) to the annular chamber (120) to axially move the orbital scroll (20) into sealing contact with the fixed scroll (18). The solenoid valve (176) also directs fluid from the exhaust chamber (42) to the annular chamber (120) to maintain the orbital scroll (20) in sealing contact with the fixed scroll (18).

Abstract: A scroll compressor (10) with a fixed scroll (18) and orbital scroll (20) has an axial thrust and anti-rotation assembly (22), a drive assembly (24), a balance assembly (26) and a control system (28). The drive assembly (24) includes a crankshaft (116) and a bushing assembly (108). The bushing assembly includes a bushing body (146) with a slot (154) journaled on the orbital scroll and a drive lug (150) positioned in the slot and non-rotatably secured to the crankshaft. Springs (156) bias the bushing body toward a position in which the axis of the bushing body (178) coincides with the axis (176) of the crankshaft (116) and the crankshaft can rotate without moving the orbital scroll (20). The bushing body can be moved by compressed fluid to a position in which the springs are compressed, the scroll wraps (34 and 56) are in sealing contact and the drive assembly will drive the orbital scroll (20) in a circular orbit with a radius R.sub.o.

Abstract: A compliant device for a scroll-type fluid compressor including a drive shaft having an axis of rotation. A disk shaped rotor is affixed at one end of the drive shaft and includes a drive pin extending from the side of the rotor opposite the drive shaft. The drive pin 13 disposed at a location eccentric to the axis of rotation of the drive shaft and includes at least one external spline extending therefrom. The scroll-type fluid compressor includes a bushing having an axis of revolution and an orbiting fluid displacement member which is movable in cooperating relationship with the bushing. The bushing has an aperture adapted to receive the drive pin including at least one internal spline mating with the external spline of the drive pin. Clearances defined between the external spline and the internal spline allow displacement of the disk shaped rotor in relation to the bushing upon rotation of the drive shaft.

Abstract: A high pressure vane pump has a two-piece rotor enclosed by a housing having an inlet and an outlet and an eccentric ring for controlling the reciprocation of vanes in a guide part of the rotor; the eccentric ring is closed by opposite end plates and a moveable crown part of the rotor is supported on the guide part to provide four degrees of freedom between the guide part and the crown part including movement of the crown part axially of the guide part; movement of the crown part clockwise and counterclockwise of the guide part; and yaw movement of the crown part with respect to the vertical axis of the guide part. Rotation of the rotor causes the crown part to be shifted axially of the guide part to increase the pressure output of the pump at high speed operation and to reduce the frictional losses between the rotor and the housing during start-up.

Abstract: A gear motor comprises two meshing gears and a pressure plate pressed against respective lateral surfaces of the gears by pressure in two substantially concentric separate pressure areas arranged on a side of the pressure plate remote from the gears. A control valve controls pressure in one of the pressure areas to adjust a contact pressure of the pressure plate on the gear in such a manner as to increase the contact pressure with an increase in working pressure.

Abstract: In an epitrochoidal rotary air compressor, a stationary portion includes a stationary single offset power shaft on which is mounted an epitrochoidal rotor in a rotary housing portion. The rotor includes a pinion gear which cooperates with a ring gear in the rotary housing portion to move the rotor within the rotor chamber in the rotary housing portion. A centrifugally driven lubrication system including lubrication channels extending internally of the stationary power shaft is provided for lubricated bearings and gears within the apparatus. An improved compression seal engaging the lateral faces of the rotor has a plurality of buttons biasing a split ring against the lateral faces of the rotor. An air pressure unloader valve is centrifugally operated to release the load from the compressor during startup. A rotary after-cooler in the rotary housing portion removes thermal energy from the compressed air prior to leaving the compressor and an inter-cooler may be provided in a two stage compressor.

Abstract: A capacity control device for a screw compressor provided with a capacity control passage and a slide valve adjusting the opening thereof, wherein the slide valve is driven in a closing direction due to a pressure difference between a high pressure and a low pressure and is moved in an opening direction thanks to function of a spring when the high pressure is balanced with the low pressure, and when the pressure difference between the high pressure and low pressure is lower to cause the slide valve to be open thanks to the function of the spring, the slide valve is moved in the closing direction against the spring by use of pressure in a compression-processing part in the screw compressor, thereby enabling to quickly transit from no load condition to a loaded condition.

Abstract: A scroll compressor comprises an orbiting scroll and a fixed scroll, each of which includes a spiral wrap. These orbiting and fixed scrolls define between their wraps a plurality of close spaces at symmetrical positions. These closed spaces are moved toward the center of the scrolls by means of orbital motion of the orbiting scroll relative to the fixed scroll for reducing their capacities to compress fluid confined therein. Upon starting the compressor, some of the spaces which are in mid course of compressing and the other closed spaces which locate at the downstream side just before the communication with a discharge port, are communicated with each other through valves which open when pressure in the closed spaces at the upstream side is higher than that in the closed spaces at the downstream side, whereby a loading torque upon starting is decreased.

Abstract: A positive displacement compressor or pump of the scroll type including first and second scroll plates having convoluted interfitting vanes. The flanks of the vanes on scroll plates are interfitting and in sealing contact with one another and the tips of the vanes in sealing contact with the other plate. One of the plates has a generally central port and the assemblage is provided with a peripheral port at the interface of the plates. A motor and linkage are provided to cause the plates to undergo orbital movement relative to each other and a selectively operable mechanism is operable to separate the plates to break sealing contact and thereby unload the compressor or pump.

Abstract: A fluid displacement apparatus is disclosed. The fluid displacement apparatus includes a housing, a fixed fluid displacement member and an orbiting fluid displacement member having an end plate from which an orbiting wall extends. The orbiting member interfits with the fixed member to make a plurality of line contacts to define at least one sealed-off fluid pocket. A drive shaft is rotatably supported by the housing, and has a drive pin which is radially offset from the axis of the drive shaft. The end plate of orbiting piston member has a boss, and bushing is rotatably supported within the boss. The bushing has an eccentric hole disposed eccentrically with respect to the center of the bushing, and the drive pin is inserted in the eccentric hole. A restriction device restricts the swing angle of the bushing and is coupled between the drive shaft and the bushing.

Abstract: A positive displacement compressor or pump of the scroll type including first and second scroll plates (10, 12) having convoluted interfitting vanes (16). The flanks (18) of the vanes (16) on scroll plates (14) are interfitting and in sealing contact (20) with one another and the tips (22) of the vanes (16) in sealing contact with the other plate (14). One of the plates (14) has a generally central port and the assemblage is provided with a peripheral port (39) at the interface of the plates (14). A motor (35) and linkage (38) are provided to cause the plates to undergo orbital movement relative to each other and a selectively operable mechanism (40, 44, 46, 48; 62, 66, 76) is operable to separate the plates (14) to break sealing contact and thereby unload the compressor or pump.

Abstract: The volumetric fluid compressor device or so-called scroll type compressor device comprises a rotary shaft mounted centrally at the front side of a housing and a movable scroll member having its scroll portion partially contacted with a scroll portion of a fixed scroll member. Sealed chambers or compression chambers delimited between the two scroll portions are contracted towards the center for compressing the refrigerant gas therein. A slider is mounted at the inner end of the rotary shaft for reciprocation radially thereof. An offset pin having an axis offset from the axis of the rotary shaft is fast with the slider and carries the movable scroll member. The slider is normally urged by a compression spring in a direction to reduce the amount of offset, that is, to reduce the radius of offset rotation of the offset pin, and may be urged by the pressure in the compression chamber in a direction to increase the radius of offset rotation of the offset pin against resiliency of the compression spring.

Abstract: A positive fluid displacement apparatus of the scroll type, having a swing link for translating the rotational motion of a drive shaft into the relative orbital motion of two parallel end plates. The facing surfaces of the parallel plates have involute wrap elements attached in fixed angular, intermeshed relationship with each other. Contacting surfaces of the parallel plates and wrap elements define pockets of fluid which are subjected to changes of pressure and volume as the pockets are caused to move between an inlet and an outlet by the orbital motion of the plates.A flexible member of resilient material connects a crank post on the drive shaft with the swing link and transfers the driving force of the drive shaft to the swing link. The flex member is rigid in tension, but flexible in bending. By its spring force, the flex member biases the wrap elements slightly apart when the drive shaft is not rotating, to reduce the driving torque required at start-up of the scroll apparatus.

Abstract: In a two-stage liquid injected helical screw gas compressor a bypass line with a check valve is provided between compressor stages for delivering compressed gas from the first stage directly to the compressed gas receiver and liquid reservoir. Bypass of gas to the reservoir at startup assures pressurization of the reservoir and early flow of liquid to the first and second stage compression chambers. As the working pressure in the second stage discharge line increases above first stage discharge pressure, the check valve closes and all flow from the first stage is conducted through the second stage compression chamber.

Abstract: In a scroll compressor, under conditions favoring reverse operation, the scroll wraps are separated so as to provide a continuous, unimpeded path through the scrolls. Spring bias, a repositioning of driving contact areas and/or force areas can be used singly or in combination to cause separation of the wraps.