Abstract: A lubrication path (50) to press-contact surfaces of a fixed and orbiting scrolls (21, 22) serves also as a high-level pressure introduction passageway when a difference between a high-level pressure and a low-level pressure is great. On the other hand, when the high-level pressure introduction passageway is blocked off in a state in which the high-low pressure difference is small, refrigerating machine oil is supplied to the press-contact surfaces through a low-level pressure space (S1) within the casing, for controlling the pressing force of the orbiting scroll (22) against the fixed scroll (21), and the construction for preventing a decrease in efficiency is simplified, thereby not only reducing the cost but also preventing the occurrence of a maloperation.

Abstract: A scroll compresssor incorporates a vapor injection system where only one vapor injection port is utilized. The single vapor injection port injects refrigerant vapor into two of the initially formed enclosed spaces. The scrolls of the scroll compressor are designed with asymmetric wraps where the non-orbiting scroll wrap extends angularly further than the orbiting scroll wrap.

Abstract: On the assumption that pressure Pm1 (MPa) of a boss portion outside space determined by a restrictor and a flow regulating valve provided midway in an oil feed passageway is expressed by Pm1=Ps+&agr;, and a differential pressure value at which a difference between high and low pressures becomes minimum in a running pressure range of a scroll compressor is represented by min(Pd−Ps), the value a in the above expression is set to fall in a range expressed by 0<&agr;<min(Pd−Ps). Here, Ps represents suction pressure (MPa) of the compressor, and Pd represents discharge pressure (MPa) of the compressor.

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 scroll type compressor includes a housing, a fixed scroll member and a movable scroll member. An elastic member is formed in an annular and planar shape and is fixed in the housing on a side of a back surface of the movable base plate so as to slidably contact the back surface of the movable base plate of the movable scroll member at a sliding region of the elastic member. A facing wall is provided on a side opposite to a side of the movable scroll member with respect to the elastic member. A first space is formed between the elastic member and the facing wall for allowing the elastic member to be elastically deformed. The elastic member is elastically deformed toward the facing wall by press-contacting the movable scroll member, whereby the movable scroll member is urged toward the fixed scroll member.

Abstract: Scroll compressors include a tap for communicating a compressed refrigerant to a back pressure chamber to resist a separating force. A restriction is placed within this tap to slow build-up of the back pressure chamber at start-up. Further, the restriction smoothes out any fluctuations in the back pressure force as the pressure in the compression chamber from which the refrigerant is tapped may fluctuate.

Abstract: The present invention provides an apparatus that reduces friction loss in a scroll compressor including a floating ring member inserted in an insertion recess of a hub formed on a lower part of an orbiting scroll to be rotated and revolved, and a slide bush which is fixed on an eccentric portion of a rotary shaft and is inserted in a center of the floating ring member in order to minimize friction loss and component abrasion generated during transmitting rotating force of a driving motor to the orbiting scroll. Therefore, in the present invention, the worn components can be replaced easily.

Abstract: In a scroll compressor furnished with a fixed scroll and an orbiting scroll, and provided with steps on end plates of the fixed scroll and the orbiting scroll, formed such that the height thereof is high at a central side and low at an outer peripheral end side in a spiral direction of the walls, and with upper rims of the walls formed in a stepped shape corresponding to the steps, gaps are respectively provided between the end plates and upper rims of the walls, and a height of the gaps at room temperature is formed higher than a height under operating conditions. Moreover, the steps are provided at positions which exceeds a pitch angle of &pgr; (rad) along the spiral direction from the outer peripheral end. Furthermore, a concavity is formed in the end plate of the fixed scroll, and a discharge valve is provided in the concavity. Moreover, a plate which is freely movable in an orbit axis direction of the orbiting scroll is arranged, and a pressing device which presses the plate is provided.

Abstract: In a scroll compressor in which a movable scroll is placed between a housing and a fixed scroll to define a compression chamber in cooperation with the fixed scroll, an Oldham ring slidably interposed between the housing and the movable scroll to regulate a motion of the movable scroll. The Oldham ring has a space forming a back pressure chamber between the housing and the movable scroll. The movable scroll has a through hole allowing the compression chamber to communicate with the back pressure chamber.

Abstract: A scroll type compressor includes a housing, a movable scroll member, a plurality of compression chambers, a discharge port, a communication passage and a relief valve. The communication passage interconnects each intermediate compression chamber with the discharge port. The communication passage has a first portion and a second portion. The first portion extends from the first intermediate compression chamber and the second portion extends from the second intermediate compression chamber. The first portion and the second portion meet at a meeting point on the way in the communication passage before reaching the discharge port. The relief valve is placed between the meeting point and the discharge port inclusive of the meeting point in the communication passage. The relief valve opens the communication passage when the pressure in the first and the second intermediate pressure chambers is higher than the pressure in the discharge port.

Abstract: Scroll compressors (1) may include a housing (2, 3) having an inlet port (3a) and an outlet port (3b). A drive scroll (10) may be rotatably disposed within the housing and may have a rotational axis. A driven scroll (20) may be rotatably disposed within the housing and may have a rotational axis. The driven scroll rotational axis preferably is offset to the drive scroll rotational axis. Further, at least one compression chamber (30) is preferably defined between the drive scroll and the driven scroll. A first bearing (14) may rotatably support the drive scroll in a cantilever manner and a second bearing (24, 115) may rotatably support the driven scroll in a cantilever manner. A transmission (31, 131, 231 and 331) or other device may be provided to rotate the drive scroll in synchronism with the driven scroll.

Abstract: A scroll compressor properly copes with a volume variation of a compressing chamber due to an inflow of an incompressible fluid by installing a radial moving apparatus between an eccentric part of a crankshaft and an orbiting scroll which enables the orbiting scroll to move radially so as to prevent the breakage of the scroll and improve a reliance of the compressor. The present invention includes a casing, a driving unit arranged at a lower side of the casing and connected to a crankshaft so as to generate a driving force, a compressing unit having an orbiting scroll eccentrically connected to the crankshaft and a fixed scroll to form a compressing chamber between the orbiting and fixed scrolls, and a compliance device installed between the compressing unit and the crankshaft for retreating the orbiting scroll in a radial direction when an incompressible material flows in the compressing chamber.

Abstract: The present invention provides the art with a scroll machine which has a plurality of built-in volume ratios along with their respective design pressure ratios. The incorporation of more than one built-in volume ratio allows a single compressor to be optimized for more than one operating condition. The operating envelope for the compressor will determine which of the various built-in volume ratios is going to be selected. Each volume ratio includes a discharge passage extending between one of the pockets of the scroll machine and the discharge chamber. All but the highest volume ration utilize a valve controlling the flow through the discharge passage.

Abstract: A variable quantity control apparatus for a variable radius type scroll compressor comprises: a rotary shaft coupled to an orbiting scroll for transmitting a rotating force of a driving motor to the orbiting scroll; and an eccentric bushing coupled to a driving pin part of the rotary shaft for transmitting the rotating force of the driving motor and at the same time, for restraining a recession amount of the orbiting scroll, whereby manufacturing cost can be reduced because an additional stopper member can be excluded and the number of components and the number of assembling processes are reduced, and the recession of the eccentric bushing (or the orbiting scroll) can be stably restrained by the surface contacting of a cut surface of the rotary shaft and stopping surfaces of the eccentric bushing.

Abstract: In a scroll compressor, in order to provide a structure of a driving pin for a scroll compressor which is capable of transmitting a rotational force by being combined with a rotating scroll, in a scroll compressor comprising a fixed scroll having a wrap, a rotating scroll having a wrap engaged with the wrap of the fixed scroll and performing a rotational motion in a radial direction of the rotational axis of a driving device, a driving pin eccentrically formed at the rotational axis of the driving device and inserted into a boss of the rotating scroll and a bush member interposed between the boss of the rotating scroll and the driving pin, the driving pin has a length shorter than a length of the bush member. Accordingly, it is possible to prevent a damage of a driving pin due to a stress concentration by reducing a bending moment of the driving pin.

Abstract: Disclosed is a scroll compressor coping properly with a volume variation of a compressing chamber due to an inflow of an incompressible fluid or the like by installing a radial moving apparatus enabling an orbiting scroll to move radially between an eccentric part of a crankshaft and the orbiting scroll so as to prevent the breakage of the scroll and improve a reliance of the compressor. The present invention includes a casing having a high pressure inside, a driving unit arranged at a lower side of the casing and connected to a crankshaft so as to generate a driving force, a compressing unit having an orbiting scroll connected to the crankshaft eccentrically and a fixed scroll so as forming a compressing chamber between the orbiting and fixed scrolls, and a compliance means for retreating the orbiting scroll in a radial direction when an incompressible material flows in the compressing chamber, the compliance means installed between the compressing unit and the crankshaft.

Abstract: A structure is provided that prevents excessive force from acting on a fastening portion where a guide frame is fastened to a sealed container. A fastening position of the guide frame and sealed structure is set within a range bounded by an upper meshing circumferential inner surface of the guide frame together with an upper meshing circumferential outer surface of a compliant frame and a lower meshing circumferential inner surface of the guide frame together with a lower meshing circumferential outer surface of the compliant frame.

Abstract: Scroll compressors (1) may include a housing (2, 3) having an inlet port (3a) and an outlet port (3b). A drive scroll (10) may be rotatably disposed within the housing and may have a rotational axis. A driven scroll (20) may be rotatably disposed within the housing and may have a rotational axis. The driven scroll rotational axis preferably is offset with respect to the drive scroll rotational axis. Further, at least one compression chamber (30) is preferably defined between the drive scroll and the driven scroll. First bearings (14, 16, 16a) may rotatably support one of the drive scroll and the driven scroll in a straddle manner. A second bearing (24) may rotatably support the other of the drive scroll and the driven scroll in a cantilever manner. A transmission (31, 131, 231 and 331) or other device may be provided to rotate the driven scroll in synchronism with the drive scroll.

Abstract: In order to give appropriate back pressure to an orbiting-scroll during any operation, on one end side of a cylindrical thrust ring, there is provided a flange portion, and a movable range of the orbiting-scroll in an axial direction with respect to a regulation surface of a main frame is indirectly regulated through this flange portion, on the flange portion, there is provided a groove, and the groove is caused to communicate to a first back-pressure chamber at a low-pressure side.

Abstract: A scroll compressor includes first and second scroll members having wraps interfitting to define compression chambers. As is known, a back pressure chamber is defined to hold the two scroll members in contact with each other. A valve is positioned to selectively block flow of refrigerant into the back pressure chamber, but is condition responsive to change the flow of refrigerant into the back pressure chamber dependent on conditions within the compressor. In one embodiment, the valve normally blocks a second tap which communicates with discharge pressure. If an elevated temperature is reached the valve moves to an open position and refrigerant can flow from the discharge pressure chamber into the back pressure chamber. In another embodiment, the valve selectively closes a lower pressure tap.

Abstract: A scroll compressor includes first and second scroll members having wraps interfitting to define compression chambers. As is known, a back pressure chamber is defined to hold the two scroll members in contact with each other. A valve is positioned to selectively block flow of refrigerant into the back pressure chamber, but is condition responsive to change the flow of refrigerant into the back pressure chamber dependent on conditions within the compressor. In one embodiment, the valve normally blocks a second tap which communicates with discharge pressure. If an elevated temperature is reached the valve moves to an open position and refrigerant can flow from the discharge pressure chamber into the back pressure chamber. In another embodiment, the valve selectively closes a lower pressure tap.

Abstract: In a scroll type compressor (1) that includes a fixed scroll (21) fixed inside of a casing (10) and a movable scroll (22) meshed with the fixed scroll (21) and presses the movable scroll (22) against the fixed scroll (21), the pressing force of the movable scroll (22) against the fixed scroll (21) is obtained from the pressure of a high-pressure space (S2) that acts on the back face of the movable scroll (22) and the pressing force is controlled in accordance with the variation in the compression ratio with the change in the operating condition thereby preventing decrease in efficiency and mechanical loss.

Abstract: A scroll compressor is provided with a valve plate which selectively blocks communication between a tap and the back pressure chamber. The valve plate is configured such that it blocks communication during portions of the orbiting cycle and allows communication at other portions. In this way, a scroll compressor designer is able to select the portions of the compression cycle at which refrigerant is delivered to the back pressure chamber. A more consistent and stable operation of the scroll compressor can thus be achieved.

Abstract: A variable quantity control apparatus for a variable radius type scroll compressor comprises: a rotary shaft coupled to an orbiting scroll for transmitting a rotating force of a driving motor to the orbiting scroll; and an eccentric bushing coupled to a driving pin part of the rotary shaft for transmitting the rotating force of the driving motor and at the same time, for restraining a recession amount of the orbiting scroll, whereby manufacturing cost can be reduced because an additional stopper member can be excluded and the number of components and the number of assembling processes are reduced, and the recession of the eccentric bushing (or the orbiting scroll) can be stably restrained by the surface contacting of a cut surface of the rotary shaft and stopping surfaces of the eccentric bushing.

Abstract: The present invention is related to a scroll compressor sealing unit structure, more particularly, a floating bearing and seal washer joined together so that the inverted edge of a slanting edge together form a slanting edge, and that a round cap together with a seal washer are fitted into the inverted edge of the floating bearing to form a single unit, and that the bottom edge of the rounded cap fit into the inverted and sloping edge of the floating bearing, so that the seal washer is able to act as a sealing unit in the space defined by this connection, and in this way ensure that in the fitting together of the round cap and seal washer a firm and fully sealed connection is effected.

Abstract: A scroll compressor including a guide frame (22) for fixing a fixed scroll member (12) and a compliant frame (24) for supporting an oscillating scroll member (14) in the axial direction of the scroll compressor in the guide frame (22), wherein the guide frame (22) has a plurality of cylindrical surfaces (33, 35), and the compliant frame (24) has a plurality of cylindrical surfaces (23, 25) which engage with the cylindrical surfaces (33, 35), and wherein in order to facilitate assembling of the guide frame (22) and the compliant frame (24), the first cylindrical surfaces (25, 35) are first engaged with each other when the compliant frame (24) is inserted into the guide frame (22), that is, the cylindrical surfaces are engaged in the order of increase in diameter.

Abstract: An improved control over the pressure vented or tapped to a back pressure chamber in a scroll compressor is achieved by maintaining a vent hole closed for the majority of the operational cycle of the scroll compressor. The hole is preferably selectively exposed to a discharge pressure for a small portion of the cycle, and to an intermediate pressure for a second small portion of the cycle. Other than those two small portions, the hole is preferably closed. The invention reduces pulsation in the back pressure chamber and also reduces pumping losses caused by fluid moving into and out of the back pressure chamber through the hole. In one embodiment, grooves are formed in the fixed scroll member to communicate a selected intermediate pressure and a discharge pressure to locations on the base plate of the fixed scroll member. A vent hole in the wrap of the orbiting scroll member cyclically moves over the two grooves.

Abstract: Spiral fixed scroll teeth (2a) project from an end plate (2b) of a fixed scroll (2), and spiral movable scroll teeth (4a) project from an end plate (4b) of a movable scroll (4). The end plate (4b) of the movable scroll (4) is provided with a discharge port (8) for discharging compressed refrigerant gas. A pressure chamber (16) is provided on the back surface of the end plate (2b). A port (10) communicating with the pressure chamber (16) is provided on a position of the end plate (2b) opposed to the discharge port (8). Thus obtained is a scroll compressor reducing pulsation when discharging a fluid by feeding the compressed fluid into the pressure chamber.

Abstract: An object of the present invention is to provide a scroll compressor that improves assembly precision and the engagement projections are not easily damaged even when a strong force is applied to the Oldham ring during operation; in order to attain this object, a scroll compressor is provided wherein a fixed scroll member comprising an end plate and an involute wrap provided on one face of the end plate, and an orbiting scroll member comprising an end plate and an involute wrap provided on one face of this end plate, and which form a plurality of compression chambers in combination with the involute wrap of the fixed scroll member, wherein a mechanism that prevents autorotation of this orbiting scroll memberand permits rotation of the orbiting scroll member with respect to fixed scroll member is provided between the orbiting scroll member and fixed scroll member.

Abstract: Scroll compressors may preferably include a stationary scroll, a drive shaft, a crank shaft coupled to the drive shaft and a bush coupled to the outer surface of the crank shaft. A seal is preferably disposed between the bush and the crank shaft and the seal is elastically deformable in the radial direction of the crank shaft. A movable scroll may be coupled to the crank shaft and disposed adjacent to the stationary scroll. A compression chamber is defined by a space between the stationary scroll and the movable scroll, such that fluid is compressed within the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. Further, a discharge port is preferably defined within the movable scroll and adapted to release the compressed fluid to a side that is opposite of the stationary scroll.

Abstract: Scroll compressor may include, for example, a stationary scroll, a drive shaft, a crank shaft coupled to the drive shaft, a bush coupled to the outer surface of the crank shaft and a movable scroll coupled to the crank shaft. The movable scroll is preferably disposed adjacent to the stantionary scroll. A boss may be coupled to the movable scroll and the boss preferably protrudes from the movable scroll at the opposite side of the stationary scroll. A seal is preferably disposed in a clerance defined between the bush and the boss. A compression chamber is defined by a space between the stationary scroll and the movable scroll. Fluid is compressed within the compression chamber when the movable scroll revolves or orbits with respect to the stationary scroll. A discharge port is preferably defined within the movable scroll and is adapted to discharge compressed fluid to a side that is opposite of the stationary scroll.

Abstract: A scroll compressor has a non-orbiting scroll axially secured within an end cap. The compressor is of the sort wherein the back pressure chamber is defined behind the orbiting scroll. In one embodiment a spring biases the non-orbiting scroll toward the orbiting scroll. In other embodiments the non-orbiting scroll is force fit within the end cap.

Abstract: A scroll compressor has a non-orbiting scroll axially secured within an end cap. The compressor is of the sort wherein the back pressure chamber is defined behind the orbiting scroll. In one embodiment a spring biases the non-orbiting scroll toward the orbiting scroll. In other embodiments the non-orbiting scroll is force fit within the end cap.

Abstract: A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus includes an adjustment mechanism capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll of two portions, with a supporting portion surrounding an eccentric bearing of higher density than that of a scroll portion. The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes an orbital scroll having two portions, a supporting portion surrounding an eccentric bearing having a lower coefficient of thermal expansion than that of a scroll portion, to reduce thermal expansion of the supporting portion, reducing misaligmnent of the eccentric orbital scroll on the bearing.

Abstract: A radial compliance scroll compressor is provided where two scrolls having involute wraps are engaged with each other, the orbiting scroll of the two scrolls having a boss portion eccentrically coupled to a driving pin portion formed on the front end surface of a crank shaft undergoes an orbital motion to thus form a plurality of compression chambers whose positions are continually moved between the two wraps, and the orbiting scroll coupled to the crank shaft goes backward in a radial direction within a predetermined range to thus isolate the wraps of the two scrolls from each other and then return to the normal state, thereby forming a compression chamber, which is characterized in that: an eccentric bush is inserted between the outer circumferential surface of the driving pin portion of the crank shaft and the inner circumferential surface of the boss portion of the orbiting scroll coupled thereto to be rotatably and eccentrically coupled to the crank shaft; a stopper pin restricting the radius movement of

Abstract: A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus includes an adjustment mechanism capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll of two portions, with a supporting portion surrounding an eccentric bearing of higher density than that of a scroll portion. The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes an orbital scroll having two portions, a supporting portion surrounding an eccentric bearing having a lower coefficient of thermal expansion than that of a scroll portion, to reduce thermal expansion of the supporting portion, reducing misalignment of the eccentric orbital scroll on the bearing.

Abstract: In order to give appropriate back pressure to an orbiting-scroll during any operation, on one end side of a cylindrical thrust ring, there is provided a flange portion, and a movable range of the orbiting-scroll in an axial direction with respect to a regulation surface of a main frame is indirectly regulated through this flange portion, on the flange portion, there is provided a groove, and the groove is caused to communicate to a first back-pressure chamber at a low-pressure side.

Abstract: A back pressure chamber HR is provided on the other side face of the end plate (12a) of the fixed scroll (12). The fixed scroll (12) is pressed against the orbiting scroll (13) by introducing fluid compressed into the back pressure chamber HR. Furthermore, step portions are provided on the end plates (12a) of the fixed scroll (12) and the end plate (13a) of the orbiting scroll (13), and stepped shapes are formed on the upper rim of the wall (12b) of the fixed scroll (12) and the upper rim of the wall (13b) of the orbiting scroll (13) to prevent leakage of fluid.

Abstract: In a scroll compressor furnished with a fixed scroll and an orbiting scroll, and provided with steps on end plates of the fixed scroll and the orbiting scroll, formed such that the height thereof is high at a central side and low at an outer peripheral end side in a spiral direction of the walls, and with upper rims of the walls formed in a stepped shape corresponding to the steps, gaps are respectively provided between the end plates and upper rims of the walls, and a height of the gaps at room temperature is formed higher than a height under operating conditions. Moreover, the steps are provided at positions which exceeds a pitch angle of &pgr; (rad) along the spiral direction from the outer peripheral end. Furthermore, a concavity is formed in the end plate of the fixed scroll, and a discharge valve is provided in the concavity. Moreover, a plate which is freely movable in an orbit axis direction of the orbiting scroll is arranged, and a pressing device which presses the plate is provided.

Abstract: An improved slider block for a scroll compressor has a bore including two spaced circular portions centered on a common axis. A recess is formed into one of the curved portions to provide additional clearance for movement of an eccentric pin. The recess allows the eccentric pin to move within the bore, as the relative position of the slider block and the eccentric pin move and change during operation of the scroll compressor.

Abstract: An improved slider block for a scroll compressor has a bore including two spaced circular portions centered on a common axis. A recess is formed into one of the curved portions to provide additional clearance for movement of an eccentric pin. The recess allows the eccentric pin to move within the bore, as the relative position of the slider block and the eccentric pin move and change during operation of the scroll compressor. In a further embodiment, chamfers are formed at circumferential ends of a non-drive flat surface to merge that non-drive flat surface into the circular portions. This will ensure the slider block is properly positioned on smaller eccentric pins.

Abstract: A scroll compressor having a simple structure is disclosed, which effectively decreases the thrust load imposed on the revolving scroll without degrading the compression efficiency. The scroll compressor comprises a casing; a fixed scroll provided in the housing and comprising an end plate and a spiral protrusion built on one face of the end plate; and a revolving scroll provided in the casing and comprising an end plate and a spiral protrusion built on one face of the end plate, wherein the spiral protrusions of each scroll are engaged with each other so as to form a spiral compression chamber.

Abstract: An improved slider block for a scroll compressor has a bore including two spaced circular portions centered on a common axis. A recess is formed into one of the curved portions to provide additional clearance for movement of an eccentric pin. The recess allows the eccentric pin to move within the bore, as the relative position of the slider block and the eccentric pin move and change during operation of the scroll compressor.

Abstract: A structure is provided that prevents excessive force from acting on a fastening portion where a guide frame is fastened to a sealed container. A fastening position of the guide frame and sealed structure is set within a range bounded by an upper meshing circumferential inner surface of the guide frame together with an upper meshing circumferential outer surface of a compliant frame and a lower meshing circumferential inner surface of the guide frame together with a lower meshing circumferential outer surface of the compliant frame.

Abstract: A scroll compressor has a fixed scroll member, a movable scroll member, a housing. The housing is secured to the fixed scroll member. The housing accommodates the movable scroll member to define a back pressure chamber. Pressure in the back pressure chamber is applied to the back surface of a movable scroll base plate of the movable scroll member. The back pressure chamber communicates with a region through a communication passage. The region is lower in pressure than the back pressure chamber. The communication passage relieves the pressure in the back pressure chamber to the region. The communication passage includes a valve. The valve varies an opening amount of the communication passage due to difference between the pressure in the compression region in the predetermined period of a compression process of the gas, and the pressure in the back pressure chamber.

Abstract: A scroll compressor includes an oil supply cross-hole extending radially outwardly to the outer peripheral surface of the base of the orbiting scroll. The cross-hole supplies lubricant against the crankcase towers such that lubricant is supplied to both the Oldham coupling and the seals for the back pressure chamber. The cross-hole is preferably positioned to be between 80° and 90° downstream from the beginning of the orbiting scroll wrap. In this position, adequate oil will be supplied to lubricate the Oldham coupling and the seal, while at the same time, it is unlikely that an undue amount of lubricant will be allowed into the scroll compressor chambers.

Abstract: An improved scroll compressor having an axially movable non-orbiting scroll eliminates the need for a separator plate. With the elimination of the separator plate, a back pressure chamber is provided to resist the discharge pressure which will be directed against a rear face of the non-orbiting scroll. In other embodiments, a seal on the rear of the non-orbiting scroll contacts the inner periphery of the end cap. Various ways of increasing the discharge pressure volume, or eliminating undesirable noise are also disclosed. Further, several ways of connecting the end cap to the center shell are also disclosed.

Abstract: In order to improve a compressor comprising a scroll compressor with a first compressor member and a second compressor member, a drive with a drive motor and an entraining unit which has an entraining member moving on an entraining path and an entraining member receiving means arranged on the second compressor member, wherein the compressor member receiving means is movable in a radial direction in relation to the central axis with a radial degree of freedom in relation to the entraining member, in such a manner that this can be produced as simply as possible and operates as reliably as possible it is suggested that the entraining member have an entraining member surface curved convexly in a direction transverse to the central axis in a direction of rotation, that the entraining member receiving means be non-rotatably arranged in relation to the second compressor member and have an entraining surface which surrounds the entraining member in a ring shape and on which the entraining member surface bears by alwa

Abstract: A scroll compressor is provided with a clutch to minimize or eliminate the detrimental effects of reverse rotation. Generally, the clutch prevents rotation of the shaft during both powered and unpowered reverse rotation. The clutch could be subject to damage during powered reverse rotation, and thus a clutch protection mechanism is incorporated that will prevent the clutch from moving to an actuated position if powered reverse rotation occurs.

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.