Abstract: A scroll compressor, which allows refrigerant in a compressor chamber to be partially discharged so that frictions generated in frictional surfaces between an orbiting scroll and an Oldham ring and between the Oldham ring and a main frame may be decreased. Also, an upper chamber may be formed on an upper surface thereof and a lower chamber may be formed on a lower surface thereof. An oil supply structure may be provided in a main frame such that lubrication is smoothly performed. Additionally, at least one key may be provided protruding from the lower surface of the Oldham ring. Further, the main frame may include at least one key groove configured to receive the at least one key of the Oldham ring. Additionally, the oil supply groove may be provided separately from and in communication with the at least one key groove.

Abstract: Disclosed herein is a back pressure apparatus for orbiting vane compressors that is capable of reducing excessive axial force applied to an orbiting vane due to high-pressure refrigerant gas introduced to the lower surface of a vane plate of the orbiting vane. The back pressure apparatus comprises a back pressure chamber formed at the upper surface of a main frame, which is brought into tight contact with the lower surface of a vane plate of an orbiting vane, and a low-pressure gas communication part for allowing the back pressure chamber and an inlet port to communicate with each other therethrough. Consequently, the present invention has the effect of preventing excessive friction between the orbiting vane and the inner surface of a cylinder, preventing damage to the orbiting vane compressor due to the friction, and preventing deterioration of performance of the orbiting vane compressor due to the frictional loss.

Abstract: A scroll machine includes a shell and a pair of scroll members. At least one of the scroll members disposed in the shell is mounted for axial movement with respect to the other scroll member disposed in the scroll. The amount of axial movement of at least one scroll member is accurately controlled by providing a stop. The stop is defined by the contact of the end plate of the at least one scroll member with another member of the scroll machine which is accurately positioned within the shell of the scroll machine. The member can be either the shell or another component which engages the shell.

Abstract: A scroll compressor has a stop on its eccentric pin to selectively engage a notch in a slider block, and prevent the slider block from moving upwardly and contacting a rear surface of the orbiting scroll. The present invention prevents this unwanted contact, and the resultant wear.

Abstract: Scroll compressors are provided with vapor injection or by-pass ports that will allow greater flow of refrigerant through the port than was the case in the prior art. The prior art has typically utilized a single injection port having a diameter equal to or slightly larger than the thickness of the scroll wrap. In this way, the scroll wrap is able to prevent or restrict cross-flow leakage from the port from passing between the two compression chambers. However, this single port has also limited the amount of refrigerant that can be returned. In one embodiment, the present invention utilizes a plurality of ports generally spaced along the length of the wrap such that cross-flow can still be prevented while providing a greater cross-sectional flow area into or out of the compression chambers. In another embodiment, the several ports may be replaced by a single elongated port.

Abstract: A scroll apparatus with an axial gap control function is described. The scroll apparatus is capable of controlling the axial gap between its fixed scroll and orbiting scroll. The scroll apparatus has a frame with a pair of indentations installed in the casing of the scroll apparatus, a pair of flexible elements installed at the lateral side top of the frame and spanning the pair of indentations for defining a suspended flexible segment at the span, a sidewall having a positioning ring with a downward protruding body corresponding to the indentation, in which the protruding body of the positioning ring is fixed to the flexible segment of the flexible element, a fixed scroll suspended at the positioning ring, and an orbiting scroll for orbiting into the fixed scroll.

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 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 coupling structure of an eccentric bush of a scroll compressor, comprising: an orbiting scroll; a rotary shaft provided with an eccentric part and transferring rotary power of a driving motor to the orbiting scroll; and an eccentric bush coupled between the orbiting scroll and the eccentric part of the rotary shaft, wherein an insertion hole provided with two plane contact portions having predetermined areas is formed at the eccentric bush, a cutting surface surface-contacting the plane contact portions of the eccentric bush is formed at the eccentric part of the rotary shaft, and the eccentric part is inserted into the insertion hole of the eccentric bush. Accordingly, damage to the eccentric bush or the rotary shaft can be prevented by dispersing the power applied to the rotary shaft and the eccentric bush.

Abstract: A motor accommodating chamber accommodates an electric motor such that a rotation axis of the motor is substantially horizontal. The pressure in the motor accommodating chamber is equal to the pressure in a suction chamber. A connecting passage connects a bottom portion of the motor accommodating chamber with the suction chamber. Therefore, mixture of liquids having a lowered insulating property is prevented from staying in a motor accommodating chamber.

Abstract: A scroll compressor has a novel slider block with an upper surface that extends for a greater extent than the prior art. By extending this upper surface, the upper surface is better able to withstand wear on the slider block during the life of the scroll compressor.

Abstract: A surface of a fixed scroll which is opposed to a end plate of an orbiting scroll existing outside of a lap of the fixed scroll is formed with: a substantially annular seal portion which extends such as to have an outer wall surface of the fixed scroll outwardly extending from an inner wall surface of outermost periphery of the lap substantially along the inner wall surface, and which comes into slide contact with the end plate of the orbiting scroll; a substantially annular recess located outside of the substantially annular seal portion; and a recess which is brought into communication with an intake port of the fixed scroll independently from the substantially annular recess. With this, back pressure of the orbiting scroll is increased, and turning-over phenomenon of the orbiting scroll can be suppressed.

Abstract: A compressor for suppressing leakage of lubricating oil has a casing, a motor and a scroll mechanism coupled to the motor by a drive shaft. The drive shaft is rotatably supported by a bearing. The lubricating oil is supplied between the drive shaft and the bearing. An oil collecting portion is formed at an end portion in the axis direction of a bearing portion. The bearing portion is constituted of an outer peripheral surface of the drive shaft and an inner peripheral surface of the bearing. The oil collecting portion includes an oil groove formed in the periphery direction of the drive shaft. An oil passage is formed to conduct the lubricating oil into the oil collecting portion.

Abstract: A scroll fluid machine has a low-pressure stage compression part for compressing a fluid sucked in from the outside between mutually overlapping wrap portions of two scroll members performing a relative orbiting motion and a high-pressure stage compression part for compressing the fluid sucked in from the low-pressure stage compression part between mutually overlapping wrap portions of two scroll members performing a relative orbiting motion. The scroll members in the low-pressure stage compression part have a larger radial gap between the wrap portions than that of the scroll members in the high-pressure stage compression part.

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 scroll fluid machine, an orbiting scroll is eccentrically revolved with respect to a stationary scroll so that fluid in a sealed chamber between the stationary and orbiting scrolls may be compressed toward a center. A first magnet is mounted on the stationary scroll and a second magnet is mounted on the orbiting scroll so that the same poles of the first and second scrolls may be opposite to each other thereby preventing the orbiting scroll from pressing the stationary scroll excessively.

Abstract: A scroll compressor having a vacuum preventing structure includes: a casing forming a receiving space therein; a fixed scroll fixed to a main frame installed in the casing, and including a back pressure passage at an outer side surface thereof, a discharge pressure hole formed at one side of the back pressure passage such that the back pressure passage and a discharge pressure space of the casing can communicate with each other, a middle pressure hole formed at another side of the back pressure passage such that the back pressure passage and a compression space of the casing can communicate with each other, and a suction pressure hole formed at still another side of the back pressure passage such that the back pressure passage and a suction pressure space can communicate with each other; an orbiting scroll positioned between the fixed scroll and the main frame and forming a compression space by being coupled with the fixed scroll; a piston slidably installed in the back pressure passage, for opening or closin

Abstract: An eccentric coupling device in a radial compliance scroll compressor includes a crank pin that is eccentrically arranged at an upper end of a crankshaft and provided with a vertically-extending flat surface at one side thereof. A bush is provided with a crank pin hole, overlapped by a stopper hole, for receiving the crank pin. A stopper is fitted in the stopper hole such that the stopper radially protrudes into the crank pin hole toward the flat surface to selectively come into contact with the flat surface in accordance with a rotation of the bush. An elevating preventing device is adapted to elastically support the bush, while connecting the stopper and the crank pin via a spring wire, preventing an elevation of the bush.

Abstract: A scroll compressor has a movable auxiliary member provided by mounting it between a frame member and a circling scroll member. The movable auxiliary member has a stopper portion for causing a contact plane to contact a pane of a fixed scroll member and a ring portion having an opposed plane annularly formed to face the pane of the circling scroll member, is further supported elastically by an elastic support in a state of being energized in a direction of the circling scroll member, has the contact plane of the stopper portion caused to contact the pane in this elastic support state to keep a limit position with the opposed plane facing the pane of the circling scroll member, and goes back elastically to the frame member side when the circling scroll member goes back to the frame member side and the pane is pressed to contact the opposed plane.

Abstract: An eccentric coupling device in a radial compliance scroll compressor including a crank pin eccentrically arranged at an upper end of a crankshaft included in the scroll compressor, and provided with a vertically-extending cut surface at one side thereof, a bush fitted around the crank pin, and provided with a crank pin hole and a stopper hole, a stopper fitted in the stopper hole, and an engagement jaw adapted to prevent a vertical movement of the stopper, thereby preventing a vertical movement of the bush, the engagement jaw being provided at an upper end of the crank pin. The bush is arranged such that an upper end thereof is flush with an upper end of the crank pin. The stopper hole overlaps with the crank pin hole so that the stopper selectively comes into contact with the cut surface in accordance with a rotation of the crank pin. The stopper has a length shorter than that of the stopper hole.

Abstract: A scroll compressor includes a housing, a discharge passage, a rotary shaft, a fixed scroll, a movable scroll, an oil separator and an oil reservoir for compressing refrigerant gas containing lubricating oil. The housing has a rear housing which has a partition wall. The discharge passage is formed in the housing. The discharge passage has a discharge chamber, a discharge hole and an accommodation chamber. The discharge chamber and the accommodation chamber are communicated with each other through the discharge hole. The oil separator is provided in the accommodation chamber. The oil separator has a separation member and an oil reserved area. The oil reservoir is defined around an entire circumference of the partition wall which defines the discharge chamber therein. The oil reservoir is formed so as to communicate with the oil reserved area of the oil separator.

Abstract: An axial compliance mechanism of a scroll compressor is installed between a compressor housing and a scroll. The housing has a first shell and a second shell. The first shell defines a chamber and has a guiding part at one end of and in communication with the interior of the chamber. The scroll has a fixed scroll member and an orbiting scroll member. A plurality of compression pockets is formed between these two scroll members. A rear surface of the fixed scroll member has a protrusion matching the guiding part of the first shell and a venting hole in communication with the compression chambers. A sealing device is installed between the guiding part and the protrusion, and a negative pressure chamber is formed. Thereby, the working fluid is guided into the negative pressure chamber during operation, so as to provide a tight attachment between the fixed scroll member and the orbiting scroll member, such that the volume efficiency of the compressor is enhanced.

Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

Abstract: A flow rate controlling member, provided with a spiral passageway formed on its outer periphery, is inserted into a high pressure fluid introducing passageway formed in an end plate of a movable scroll for the introducing of fluid from a fluid feeding path into a thrust bearing.

Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

Abstract: An eccentric bush structure in a radial compliance scroll compressor including an eccentric bush fitted around a crank pin eccentrically provided at an upper end of a crankshaft, crank pin and stopper holes provided at the eccentric bush, and a weight member adapted to increase a weight of the eccentric bush. The stopper hole overlaps with the crank pin hole such that a stopper received in the stopper hole is radially protruded into the crank pin hole toward a vertically-extending cut surface formed at the crank pin to selectively come into contact with the cut surface in accordance with a rotation of the crank pin.

Abstract: A compressor housing defines a motor accommodating chamber. The pressure in the motor accommodating chamber is equal to the pressure in a suction chamber. A first reservoir chamber is located in a discharge chamber. A second reservoir chamber is defined about the discharge chamber. A communicating passage connects the first reservoir chamber with the second reservoir chamber. A restrictor is located in the communicating passage. An oil return passage connects the second reservoir chamber with the suction chamber. A connecting passage connects the motor accommodating chamber with the suction chamber. Therefore, leakage of electricity is prevented.

Abstract: An axial complaint mounting system for a scroll machine positions the centroid reaction of the mounting system toward the top of a mounting bore extending through the axial compliant scroll member. The mounting system defines a first clearance located near the top of the mounting bore and a second clearance located near the bottom of the mounting bore. The positioning of the centroid reaction for the mounting system is accomplished by designing the second clearance larger than the first clearance.

Abstract: A scroll compressor has an eccentric pin that extends forwardly of a rotating shaft. The eccentric pin generally has a curved outer portion and a flat outer portion. Each of the flat and curved outer portions have fillets that are formed to merge the eccentric pin portions into an end surface or shoulder on the shaft. The fillets are formed to have a relatively complex shape with more than a single radius of curvature. In one embodiment, there are two radii of curvature, with a greater radius of curvature formed to extend from an outer periphery of the eccentric pin, and merge into a second portion having the lesser radius of curvature that merges from the first portion downwardly into the shoulder. In a second embodiment, the fillet generally has the shape of one quarter of an ellipse.

Abstract: A scroll compressor supplies an optimum quantity of lubricating oil to a refrigerant compressing section and restrains a decrease in compression efficiency caused by gas leakage. An oil supply passage (35) whose discharge port is open to a joint surface of a main frame (3) and a fixed scroll (4) is provided, and a throttle pin (353) is inserted in the oil supply passage (35) with a predetermined clearance to regulate the inflow quantity of lubricating oil (0). Also, a groove-shaped connecting portion is formed in the joint surface on the main frame side to connect the discharge port to a compression chamber (43).

Abstract: A scroll fluid machine comprises fixed and orbiting scrolls. The fixed scroll has a fixed end plate having inner and outer fixed wraps and the orbiting scroll has an orbiting end plate having inner and outer wraps. Between the fixed and orbiting end plates, an annular partition wall is provided. The orbiting scroll is driven by an eccentric portion of a driving shat to form an inner compressing chamber in which the inner fixed wrap is engaged with the inner orbiting inside the annular partition wall and to form an outer compressing chamber in which the outer fixed wrap is engaged with the outer orbiting wrap between the annular partition wall and a housing. The inner compressing chamber communicates with a rear pressure chamber behind the orbiting end plate thereby preventing the orbiting end plate from being deformed or distorted.

Abstract: An axial sealing mechanism of a scroll compressor includes a housing, a scroll device, and a floating seal member with a recess portion and a central channel. The housing includes a first shell and a second shell. The first shell has a receiving chamber. A partition is disposed inside the receiving chamber. The scroll device includes a fixed scroll and an orbiting scroll. A plurality of compression pockets is formed between the fixed scroll and the orbiting scroll. The fixed scroll has a protruding portion with a plurality of orifices. The recess portion of the floating seal member receives the protruding portion of the fixed scroll. Seal elements are respectively secured to the floating seal member and the fixed scroll. An intermediate pressure room is thereby formed between the float seal element and the fixed scroll.

Abstract: A scroll compressor has a recess cut into a surface of a crankcase or an orbiting scroll while there is no material removed next to the seals that seal refrigerant in the back chamber located between the orbiting scroll and crankcase. Because there is no material removed next to the seals, the gap between the orbiting scroll and crankcase remains intact in the sealing area and the seals continue to operate properly preventing the refrigerant leakage through the gap. In this case, the dimensional tolerances of the crankcase and orbiting scroll surfaces need only be tightly controlled in the area adjacent to the seals. The surface areas away from the seals do not require tight tolerance control, thus manufacturing and assembly is simplified and possibility of interference due to small gap between orbiting scroll and crankcase is avoided. In the preferred embodiment, the recess is introduced into the back chamber surface area of the crankcase.

Abstract: A scroll compressor, whose back pressure is easily controlled and compression efficiency is high, is provided. The scroll compressor includes a plurality of compression chambers formed by engaging a fixed-scroll wrap and an orbiting-scroll wrap, and a back pressure chamber formed at an opposite side of the orbiting-scroll wrap of a orbiting-scroll. The scroll compressor additionally includes a high pressure chamber and a middle pressure chamber, which are formed by dividing the back pressure chamber using a seal. Moreover, the scroll compressor includes a first path for supplying lube oil from the high pressure chamber to the middle pressure chamber, and a second path for supplying the lube oil from the middle pressure chamber to an suction chamber of the compression chambers. The first path is intermittently opened by orbit of the orbiting-scroll.

Abstract: An adjusting mechanism (56) is provided to produce an anti-overturning moment to reduce an overturning moment acting on an orbiting scroll (26) during its revolution in a revolving-angle area in which the overturning moment becomes a certain value or more. Accordingly, revolution movement of the orbiting scroll (26) can be made stable by changing a pressing force of the orbiting scroll (26) against the fixed scroll (22) according to fluctuation of the overturning moment due to the revolution of the orbiting scroll (26), thereby improving the compression efficiency of a scroll-type compressor (1).

Abstract: A scroll compressor includes a protection device that has a valve movable between a position blocking flow from the back pressure chamber into the suction chamber, and a position allowing such flow. The valve is movable dependent on an oil temperature. Under adverse conditions, the oil will reach higher temperatures and the valve will open allowing flow of refrigerant from the back pressure chamber into the suction chamber. This refrigerant will likely be at an elevated temperature, and will assist the heated oil in moving a motor protection switch associated with the motor to shut down the motor. Moreover, by relieving the back pressure chamber, the two scroll members are allowed to move out of contact with each other, thereby reducing potential damage due to the adverse conditions.

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: Disclosed is a vacuum preventing device of a scroll compressor comprising: a discharge cover installed at a body of a fixed scroll for dividing inside of a case into a discharge region and a suction region; a vacuum cylinder installed in the discharge cover thus to be connected to a compression chamber formed between the fixed scroll and an orbiting scroll and having a pressure space therein so that the discharge region can be connected to the suction region; a piston movably installed in the pressure space for selectively connecting the discharge region with the suction region by a pressure difference between the compression chamber and the suction region; and an elastic member installed in the pressure space for providing an elastic force to the piston.

Abstract: A scroll compressor is provided with a non-circular back pressure chamber which is still concentric about a center axis of the compressor, such as the center axis of the drive shaft. Stated another way, an inner seal and an outer seal define a back pressure chamber. The two seals are concentric, but at least one of the seals is non-circular. In this way, reduced a back pressure chamber can be provided while still allowing the amount of orbital movement necessary for the tap for communicating a compressed refrigerant to the back pressure chamber.

Abstract: An apparatus for preventing a rotation of a scroll compressor in a reverse direction of compressing fluid is described herein. The apparatus comprises an eccentric portion of a rotational shaft that is coupled with an orbiting scroll meshed with a fixed scroll and a slide bush interposed between the eccentric portion and the orbiting scroll. The eccentric portion has a sloping plane at an outer periphery surface thereof and the sloping plane thereof contacts with a sloping plane formed at an inner periphery of the slide bush when the scroll compressor is driven in a direction opposite to a driving direction of compressing fluid. At this time, an operating angle between the contacted sloping surfaces and a reference line become large enough for a friction between the two scrolls to increase, thereby, a reverse rotation of the compressor can be prevented.

Abstract: A lubrication path to press-contact surfaces of a fixed and orbiting scrolls 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 within the casing, for controlling the pressing force of the orbiting scroll against the fixed scroll, 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 compressor providing a ring-shaped groove in an end plate of a movable scroll to form a backpressure chamber with a surface of a middle housing supporting the end plate and introducing a high-pressure fluid through the same so as to cancel out a thrust load generated by the compression reaction force. Inner and outer seal rings are provided to prevent leakage of the high-pressure fluid from the backpressure chamber. In this case, the seal rings are designed to be able to incline in the ring-shaped groove or O-rings are made joint use of to form a ring-shaped region of a higher contact pressure at a portion contacting the opposing surface, so a high sealing effect is obtained while suppressing mechanical loss.

Abstract: A self-modulating scroll compressor includes a pair of valves. A first valve moves to a low capacity position when the pressure differential is below a predetermined amount. A second valve moves to a low capacity position when the suction pressure is above a predetermined amount. Low capacity operation will only occur when both valves are open. The present invention thus provides a scroll compressor design with the ability to self-modulate and control the conditions under which low capacity operation occurs based upon two criteria.

Abstract: An adjusting mechanism is provided to produce an anti-overturning moment to reduce an overturning moment acting on an orbiting scroll during its revolution in a revolving-angle area in which the overturning moment becomes a at least a certain value. Accordingly, revolution movement of the orbiting scroll can be made stable by changing a pressing force of the orbiting scroll against the fixed scroll according to fluctuation of the overturning moment due to the revolution of the orbiting scroll, thereby improving the compression efficiency of a scroll-type compressor.

Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

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: An improved structure of vortex compressor provided with at least one threaded hole to the positioning pillar of a frame, a retainer packing locked with the screw to the frame to define an ideal spacing between the pillar and a vortex seat, and the ideal spacing being limited in position by the packing to restrict the vortex seat characterized by a deformation spacing slightly larger than the diameter of that of the prior art being provided to the threaded hole on the inner edge at the end receiving the screw to absorb squeezing produced by placement of the screw for quality assurance of the assembly of the vortex seat while eliminating the flaws of narrowing spacing of revolution between deformed positioning pillar and vortex seat or operation noise and awkward operation due to unpredictable change.

Abstract: A method of manufacturing a sliding part includes the steps of forming a green member by injection molding integrally and unmixedly two powdery metallic materials of different compositions, sintering the green member and subjecting the green member to at least one heat treatment.

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 compressor lubrication system includes a number of embodiments where lubricating oil impinges off surfaces adjacent to the orbiting scroll. The impinged oil creates a lubrication mist, which is deposited on the back surface of the orbiting scroll baseplate. The surface of the orbiting scroll onto which the oil has been deposited rubs against and carries the oil to the back chamber seals and to the back chamber. The seals thus are being lubricated by oil transfer from the back surface of the orbiting scroll to the seals. Sine the oil is deposited on the surface of the orbiting scroll, while it is exposed to suction pressure, only minimal pressurization of oil is required. Thus, there is no damage to the back pressure chamber seals due to over pressurization.