Abstract: A scroll compressor including a casing, a scroll compression mechanism that compresses refrigerant, a driving motor that has a driving shaft and is connected to the scroll compression mechanism through the driving shaft to drive the scroll compression mechanism, a main frame that supports the scroll compression mechanism in the casing, a bearing plate that supports the driving shaft of the driving motor in the casing and has an opening portion through which upper and lower spaces above and below the bearing plate intercommunicate with each other, and a first cover that covers the surrounding of the driving shaft between the driving motor and the bearing plate, wherein the cover is configured so as to be passable through the opening portion.

Abstract: A scroll compressor includes a housing having therein a discharge pressure region, a compression pressure region and a suction pressure region; a fixed scroll to form a discharge chamber as the discharge pressure region; and a movable scroll cooperating with the fixed scroll to form a compression chamber as the compression pressure region. The discharge pressure region includes an oil separation chamber connected to at least one of the compression pressure region and the suction pressure region through an oil supply passage having a flow restrictor. The flow restrictor is provided by a gap between an oil supply hole formed in the fixed scroll and an insertion member inserted in the oil supply hole. The gap is in the form of a spiral groove provided in at least one of an inner peripheral surface of the oil supply hole and an outer peripheral surface of the insertion member.

Abstract: A compressor may include a compressor housing, an oil sump, an intake chamber, a compression mechanism, a drive shaft, and a first oil passage. The oil sump may be in communication with the compression mechanism. The intake chamber may be defined within the housing. The drive shaft may include first and second ends with an oil inlet passage located therebetween. The first end may be disposed within the intake chamber and may be drivingly engaged with the compression mechanism. The second end may extend outside of the housing for driven engagement external to the housing. The oil inlet passage may be located within the intake chamber. The first oil passage may be disposed within the housing and in communication with the oil sump and the oil inlet passage.

Abstract: A scroll compressor is constructed by combining a stationary scroll and an orbiting scroll formed by erecting a scroll-shape wrap upright on a base plate meshing with each other. A scroll member constructing the stationary scroll or the orbiting scroll is constructed of an inner layer member 601 forming a core metal and an outer layer member 600 arranged so as to surround the inner layer member and forming an outer layer part, the inner layer member is constructed of a material with higher modulus of elasticity than that of the outer layer member, and separation prevention parts (uneven parts 603, depressions 604, or holes 605) preventing the inner layer member and the outer layer member from separating with each other due to difference in coefficient of thermal expansion thereof are arranged in the inner layer member.

Abstract: An oil pump is applied to a compressor which comprises a shell (1) inferiorly defining an oil reservoir (3) and carrying: a cylinder block (2) in which is journalled a crankshaft (4) carrying a pump body of the oil pump, said pump body (11) having a lower end (lib) immersed in the oil (3) and comprising: at least one collecting wall portion (12) eccentric in relation to the axis of rotation of the crankshaft (4) and which is deformed to present at least one open step (13) disposed in a plane secant to a cross section of the pump body (11) in the region of said collecting wall portion (12) and defining an opening (13a) for admitting oil to the interior of the pump body (11); and an inner impeller wall portion (14) defining a deflector transversal to the direction of admission of the oil through the open step (13) and which, with the rotation of the pump body (11), impels said oil axially and ascendingly.

Abstract: As pressure in a water tank rapidly rises when water inside a compressor is evaporated by the high temperature of compressed air and this situation makes the operation unstable, an object of the present subject matter is to address this problem. A water injected scroll air compressor is provided with: an air end of the scroll air compressor; a driving unit that generates driving force for the air end; a compressing path from a suction port to a discharge port; a portion to inject water into the compressing path; a discharge piping of air discharged from the air end; a tank provided on a path of the discharge piping for storing water separated from the compressed air; and a cooler that is provided on the path of the discharge piping between the tank and the air end and cools the compressed air discharged from the air end.

Abstract: A housing forms one portion of a compressor case and supports a bearing for a main shaft has an opening through which gas Is sucked; a suction space extending from the opening to inside of the compressor; a first gas passageway extending from the suction space in the direction of the axis of the main shaft; a second gas passageway connecting the first gas passageway and the space in which the main shaft bearing is disposed. A shell forms the other portion of the compressor case and is fastened to the housing has a third gas passageway connecting the first gas passageway and the internal space of a compression mechanism. The first gas passageway and the third gas passageway are connected to each other further on the outer side of the main shaft in the rotation radius direction than the movable region of the bottom plate of a movable scroll.

Abstract: A compressor assembly for compressing a working fluid and lubricated with an oil, including a housing having a suction plenum and a discharge plenum that defines a discharge chamber and an exhaust chamber in fluid communication through a discharge chamber outlet, and a compression mechanism disposed in the housing. A baffle member proximate the discharge chamber outlet and against which a compressed admixture of working fluid and oil expelled from the discharge chamber is impactable for separating oil from the impacting admixture. The baffle member has an oil-impingement surface for collecting oil separated from the impacting admixture and directing the flow of oil separated from the impacting admixture. Working fluid substantially at a discharge pressure and devoid of the oil collected on the oil-impingement surface is exhaustable from the exhaust chamber through the discharge port.

Abstract: A compressor may include a shell, a compression mechanism, a crankshaft, a bearing support, and a lubricant sump. The compression mechanism may be disposed in the shell and may compress a working fluid. The crankshaft may be disposed at least partially in the shell and may drivingly engage the compression mechanism. The bearing support may rotatably support the crankshaft. The lubricant sump may retain a volume of lubricant and may be disposed between the bearing support and the compression mechanism.

Abstract: This gas equipment, for other than air, includes a fixed scroll and an orbiting scroll, each having fins upon their back surfaces. The orbiting scroll remains within a housing having fins that engage with the fins on the orbiting scroll. The internal fins of the housing transfer heat from the orbiting scroll to the housing for air cooling by the atmosphere. The spiral arranged fins pump working fluid within the housing to increase heat transfer. The housing may also have an exterior fan. The orbiting scroll receives torque and rotation from a magnetic coupling or magnetic face seal, without a physical connection to a motor, so that the atmosphere does not infiltrate inside the housing. The present invention also has an enclosed inlet plenum to prevent infiltration of the atmosphere into the working fluid.

Abstract: A scroll fluid machine with ensured reliability of an oil seal and a bearing even in a compressor operation at high rpm and high load is provided, which includes: a fixed scroll; an orbiting scroll facing the fixed scroll and having a boss provided on a face opposite to the fixed scroll; a drive shaft having a leading end mounted to the boss; an orbiting bearing supporting the drive shaft in connection with the orbiting scroll; and a seal member placed between the boss and the drive shaft to seal against a lubricant supplied to the orbiting bearing. The seal member has an oil lip producing action of moving the lubricant toward the orbiting bearing by rotation of the drive shaft. A communication passage is provided in the oil lip for communication between a space between the orbiting bearing and the seal member and a space outside the boss.

Abstract: A compressor is configured to compress a refrigerant and use a lubricating oil. The compressor includes a compression mechanism configured to compress the refrigerant, a driving shaft configured to rotate about a rotation axis in order to drive the compression mechanism, a slide bearing slidably supporting the driving shaft, a first surface fixed to the driving shaft and intersecting with a line arranged in parallel to the rotation axis, a second surface facially abutted to the first surface, and a recovery space formed in the compressor. The recovery space is configured and arranged to recover the lubricating oil leaking out of bottom ends of sliding surfaces of the slide bearing and the driving shaft. The first surface and the second surface respectively continue to surfaces forming the recovery space.

Abstract: A compressor includes a housing having a discharge chamber into which compressed refrigerant gas is discharged, an oil separation chamber, a passage connecting between the discharge chamber and the oil separation chamber, and an outlet port through which the refrigerant gas passed through the oil separation chamber flows out of the housing; and a cylindrical oil separator provided in the oil separation chamber. The oil separator includes a large-diameter portion, a small-diameter portion, and an intermediate portion formed between the large-diameter portion and the small-diameter portion and tapered toward the small-diameter portion. Plural holes are formed in the periphery of the small-diameter portion of the oil separator. The passage is directed toward the small-diameter portion of the oil separator in such a manner that the refrigerant gas swirls around the small-diameter portion, so that the refrigerant gas from which lubricating oil is separated enters the oil separator through the hole.

Abstract: A scroll compressor includes a housing; a fixed scroll fixed in the housing; an orbiting scroll that has an orbiting end plate on which a spiral orbiting wall is provided upright and that is supported in the housing so as to be able to orbit while being prevented from rotating, in a state where the orbiting wall is engaged with the fixed wall; a suction section that makes refrigerant containing lubricant flow into a suction chamber provided in the housing; and a plurality of supply flow paths that are provided on a sliding surface between the housing and the orbiting end plate and that are connected to the suction chamber.

Abstract: A thrust plate for a compressor may include first and second ends and a feed hole. The first end may include a thrust surface. The second end may include a lubricant accumulation feature. The feed hole may extend between the lubricant accumulation feature and the thrust surface to provide communication therebetween. The feed hole may be angled relative to a longitudinal axis of the thrust plate such that lubricant flows through the feed hole from the lubricant accumulation feature to the thrust surface.

Abstract: A scroll type compressor including a fixed scroll, a movable scroll engaged with the fixed scroll and a hermetically sealed container, one of the fixed scroll and the movable scroll including an intercommunication path having a lower hole opened to the outside of the one scroll and an insertion hole formed by subjecting the lower hole to reaming processing from the one end to a position of a predetermined depth of the lower hole, a pin member that is slightly smaller in diameter than the intercommunication path and movably inserted in the intercommunication path, and a screw member that is provided at one end of the intercommunication path to close the one end of the intercommunication path so as to press the pin member against the end of the back side of the intercommunication path.

Abstract: A compressor incorporated with an oil separator having a separation chamber, which is placed adjacent to a discharge chamber, has a space formed in the entire inside of the separation chamber, separates oil-containing gas, being introduced, into gas and oil by centrifugal separation, allows the separated oil to drop downward, and upwardly extracts the separated gas, and also having a lower hole for introducing the separated oil into an oil storing chamber. The oil separator is formed as a joining structure of two compressor forming members, and a portion of the oil storing chamber, other than a portion where the lower hole is opened, is communicated with the separation chamber via a gas release passageway at least a part of which is formed between the two compressor forming members.

Abstract: An oil separator includes a separation part and an oil storage part. The separation part includes a separation cylinder, an inner cylinder disposed in the separation cylinder and an inlet pipe connecting to the separation cylinder tangential to an inner surface of the separation cylinder. The separation part defines an inlet opening to introduce CO2 refrigerant containing oil in the separation cylinder. The separation cylinder separates the oil from the CO2 refrigerant by means of centrifugal force. A ratio of a flow rate (kg/h) of the CO2 refrigerant flowing in the separation cylinder to an area (mm2) of the inlet opening is at least 4. Alternative to or in addition to the above, a ratio of a distance (mm) from an end of the inner cylinder to a bottom wall of the separation cylinder to an inner diameter (mm) of the separation cylinder is at least 2.5.

Abstract: Disclosed herein is a compressor in which oil retained in a hermetic case may be raised through an inner circumferential surface of a rotating shaft. The rotating shaft is provided with a hollow portion, and a fixation shaft with a spiral wing is inserted into the hollow portion to raise oil. Also, a spiral groove is formed on an outer circumferential surface of the rotating shaft to cause the raised oil to descend and lubricate the outer circumferential surface of the rotating shaft, and the hollow portion and the spiral groove are connected to each other via a guide passage.

Abstract: In a scroll fluid machine where an orbiting scroll fixed to a pivot shaft eccentrically revolves, a fixed portion is provided on a bottom of a casing, and a swing column is provided between the fixed portion and the orbiting scroll or between the fixed portion and the pivot shaft. The fixed portion withstands the thrust load of the orbiting scroll, which has been transferred by the swing column.

Abstract: A scroll type compressor including a fixed scroll, a movable scroll engaged with the fixed scroll, and a hermetically sealed container in which the fixed scroll and the movable scroll are mounted. The fixed scroll or the movable scroll has an intercommunication path for lubricating oil that is opened to the outside of the one scroll at one end thereof, extends radially inside the scroll and has a high-pressure opening intercommunicating with a high-pressure portion of the container and a low-pressure opening intercommunicating with a low-pressure portion in the scroll, a pin member disposed in the intercommunication path so as to be movable radially in the scroll, a screw member closing one end of the intercommunication path, and a stopper provided at a predetermined position in the intercommunication path to regulate radial movement of the pin member.

Abstract: The rotating shaft is connected to the generator; the high-pressure steam s is introduced to the expansion chamber b through the guide passage; when the energy of the high-pressure steam s during expansion process revolves the revolving scroll, the generator regenerates electric power. The connecting housing is provided with the inlet opening and the outlet opening; the ventilation blades are fitted to the rotating shaft. When the ventilation blades rotate, the outside air is introduced (inside of the housing) from and through the inlet opening; the air passes by the air opening and the backside of the revolving scroll, and is discharged through the outlet opening. Thus, by the approach that the air passage is formed inside of the connecting housing and the scroll housing, the high-pressure steam s is prevented from being directed toward the backside of the revolving scroll.

Abstract: A displacement machine of spiral-type construction for a compressible medium includes a displacement body having a carrier disc and helical blades extending out from both sides of the carrier disc. The carrier disc has a hub which is supported by a hub bearing on an eccentric disc which is part of a driven drive shaft. The drive shaft is supported inside a housing by a first bearing and a second bearing. These bearings are arranged in receptacles which fully project into the feed chambers of the housing so that the bearings are positioned in close proximity to the eccentric disc.

Abstract: The present invention relates to a scroll compressor, with an oil-separating drive shaft, that comprises a housing a fixed scroll which is installed inside the housing, a orbiting scroll which orbits around the fixed scroll, and a drive shaft which drives the orbiting scroll. In the orbiting scroll, a discharge hole is formed. A discharge path is formed along the longitudinal direction of the drive shaft so that discharged coolant from the discharge hole flows therethrough. At least, a part of the discharge path is inclined forward from the rotary axis to the exterior. A lubrication hole is formed in the drive shaft that penetrates from the discharge path to the outer surface of the drive shaft.

Abstract: A scroll compressor including a stationary scroll formed with a scroll wrap, an orbiting scroll formed with a scroll wrap, a rotating shaft for putting the orbiting scroll into an orbiting motion, a rotating bearing for rotatably supporting the rotating shaft on the stationary scroll, an orbiting scroll bearing provided at an eccentric shaft portion of the rotating shaft and operative to orbitably support a central portion of the orbiting scroll. A coupling transmits a torque of a driving shaft to the rotating shaft. The scroll compressor is compact based on the layout of a balancer. The orbiting scroll bearing is disposed at a central portion of the rotating shaft, and the coupling is provided with the balancer. The stationary scroll may be provided with ribs being formed therein with an oil passage for connection between a central oil passage formed in the rotating shaft and the exterior.

Abstract: The compressor includes a sealed housing defining a suction volume and a compression volume respectively provided on either side of a body contained in the housing, an oil injection circuit supplied with oil from an oil contained in a casing and adapted for injecting oil into the compression volume, the oil injection circuit comprising an electrovalve including a body attached to the wall of the sealed housing and a core movable under the action of a magnetic fluid between a closing position for injecting oil into the compression volume and an opening position preventing or limiting the injection of oil into the compression volume. The compressor includes a control system for moving the core of the electrovalve between the opening and closing positions based on the compressor speed and/or on the cooling gas discharge temperature.

Abstract: In the hermetically sealed scroll compressor, an injection pipe for injecting a fluid to a compression chamber is connected to an injecting port of a fixed scroll. The injecting port includes a first injecting port which is provided in the vicinity of a fixed scroll inner curve and injects the fluid to an orbiting outer compression chamber, and a second injecting port 22b which is provided in the vicinity of a fixed scroll outer curve and injects the fluid to a orbiting inner compression chamber 8b. The second injecting port is placed in parallel in a radius direction with respect to the first injecting port and is placed so that an orbiting scroll wrap does not practically communicate with the orbiting outer compression chamber in the state in which the orbiting scroll wrap is in contact with the outer side of a fixed scroll wrap.

Abstract: In a positive displacement machine for compressible media, having a spiral-shaped feed chamber (11) arranged in a housing (7b) between cylinder walls (14, 15), a spiral-shaped displacement body is composed of a disc (2) with spiral-shaped strips (3). The strips (3) are held eccentrically with respect to the housing, in such a way that, during operation, each point of the strip performs a movement which is limited by the peripheral walls of the feed chamber. The contour (20) of the disc is formed, in the overlapped region of the spiral at the point provided for the mutual sealing of the traversed chambers (11, 16), in the shape of the movement path. The housing edge (19) is formed, as a transition between the raised first part (17) and lowered second part (18) of the outer cylinder wall (14) of the housing, as a bulbous thickened portion. The radial extent “D” of the thickened portion is at least as great as the degree of eccentricity (“e”).

Abstract: A compressor may include a shell, a compression mechanism, a drive shaft, and first and second bearing housing assemblies. The compression mechanism may be supported within the shell and the drive shaft may have a first end drivingly engaged with the compression mechanism. The second bearing housing assembly may be located within and fixed to the shell. The second bearing housing may include a radially extending base portion defining an aperture rotatably supporting a second end of the drive shaft therein. The second bearing housing may additionally include a wall portion extending axially from the base portion and having a first region coupled to the shell at a first location, a second region coupled to the shell at a second location and a third region extending from the first region to the second region.

Abstract: To a hermetic compressor and a refrigeration cycle device having the same, an oil separator for separating oil from a refrigerant discharged from a compression unit is added. Separated oil is recollected into an oil pump driven by a driving motor. Because refrigerant separated from the oil is prevented from being re-introduced into the compressor, a cooling capability of the refrigeration cycle device may be enhanced. Because the oil pump is driven by the driving force of the driving motor, the compressor may have a simplified configuration, and the fabrication costs may be reduced. The oil used for a crankshaft lubrication process is returned to the oil pump by forming an oil pocket between bearing surfaces of a crankshaft and the oil pump, oil may be prevented from back-flowing to the oil separator from the crankshaft. This may allow oil to be smoothly recollected into the oil pump.

Abstract: A scroll compressor is provided that may include a differential pressure hole formed at or in an orbiting scroll that communicates a high pressure part with an intermediate pressure part, a decompression portion formed in the differential pressure hole and having a pin member inserted therein to decompress oil. An inner diameter D1 of the decompression portion may be greater than an outer diameter D2 of the pin member. The decompression portion may include an inlet through which oil may be introduced from the high pressure part into the differential pressure hole, and an outlet through which oil from the differential pressure hole may be discharged into the intermediate pressure part.

Abstract: A fluid machine (101) includes a first compressor (107) and a second compressor (108). The first compressor (107) has a first closed casing (111), a first compression mechanism (102a), an expansion mechanism (104), and a shaft (113). A first oil reservoir (112) is formed in the first closed casing (111). The second compressor (108) has a second closed casing (125) and a second compression mechanism (102b). A second oil reservoir (126) is formed at a bottom portion in the second closed casing (125). The first closed casing (111) and the second closed casing (125) are connected to each other by an oil passage (109) so that a lubricating oil can flow between the first oil reservoir (112) and the second oil reservoir (126). An opening (109a) of the oil passage (109) on a side of the first closed casing (111) is located above the expansion mechanism (104) with respect to the vertical direction.

Abstract: According to a compressor of the present invention, the compressor further comprises an oil separating mechanism 40 which separates oil from the refrigerant gas discharged from the compressing mechanism 10, the oil separating mechanism 40 includes a cylindrical space 41 in which the refrigerant gas orbits, an inflow portion 42 for flowing the refrigerant gas discharged from the compressing mechanism 10 into the cylindrical space 41, a sending-out port 43 for sending out, from the cylindrical space 41 to the one container space 32, the refrigerant gas from which the oil is separated, and an exhaust port 44 for discharging the separated oil and a portion of the refrigerant gas from the cylindrical space 41, and a center of the sending-out port 43 is deviated in a direction opposite from the inflow portion 42 from a center axis of the cylindrical space 41.

Abstract: An anti-self rotation mechanism for preventing self-rotation of the eccentric shaft includes a long orbiting key formed at an end of the eccentric shaft, a ring formed of a long hole through which the orbiting key slides, ring keys that extend toward both outer sides in the direction orthogonal to the longitudinal direction of the hole, and two key grooves formed in the casing, through which the ring keys slide.

Abstract: A compressor has auxiliary and main oil reservoir chambers that retain lubricant oil that is separated from refrigerant in an oil separation chamber. A part of the auxiliary oil reservoir chamber is defined by a peripheral wall of the oil separation chamber. An introducing passage for introducing lubricant oil in the oil separation chamber to the auxiliary oil reservoir chamber is formed in the peripheral wall. The inlet of the introducing passage opens to the oil separation chamber on the inner surface of the peripheral wall. The outlet of the introducing passage opens to the auxiliary oil reservoir chamber. The main oil reservoir chamber is located below the auxiliary oil reservoir chamber in the direction of gravity. A drain port for draining lubricant oil in the auxiliary oil reservoir chamber to the main oil reservoir chamber is formed in a bottom wall of the auxiliary oil reservoir chamber.

Abstract: Disclosed are a hermetic compressor and a refrigeration cycle device having the same. An oil separator for separating oil from a refrigerant is installed outside a casing. The oil separated by the oil separator is recollected into the casing by an oil pump driven by a driving force of a driving motor. The oil is recollected from the refrigerant and fabrication costs are be reduced. A cooling capability of the refrigeration cycle device is enhanced, the compressor has a simplified configuration, and the fabrication costs are reduced. Because an outlet of a discharge opening through which oil is discharged to the casing from the oil pump is installed at a position lower than a minimum level of oil in the casing, the refrigerant is prevented from backflowing into an oil passage, and the occurrence of air bubbles on the surface of oil in the compressor may be prevented.

Abstract: A valve for selectively allowing the return of oil from a discharge plenum to a suction plenum includes a passage which is selectively opened or blocked by a valve spool. The valve spool sees a pressure from a discharge pressure location upstream of a discharge check valve on one face, and a discharge pressure from a discharge plenum on an opposed face. While the compressor is running, the two pressures should be relatively equal. The face which sees the pressure from the chamber upstream of the check valve is larger than the face which sees the pressure from the discharge plenum. Thus, when the compressor is running, the valve spool is biased to a first position at which it allows oil return from the discharge plenum to the suction plenum. However, upon shutdown of the compressor, the pressure in the chamber upstream of the discharge valve drops. The valve spool will be driven to a second position at which it blocks communication for oil return.

Abstract: A compressor includes a casing configured to store lubricating oil in a bottom part, and a compression mechanism accommodated in an interior of the casing. Lubricating oil is separated out from high-pressure refrigerant discharged from the compression mechanism. Lubricating oil separated out by the oil separator flows from a high-pressure space formed in the interior of the casing and into which the high-pressure refrigerant flows. An ejector mechanism is disposed in the interior of the casing, preferably in the high-pressure space. The ejector mechanism includes a refrigerant-accelerating flow path in which the high-pressure refrigerant flows via a narrowed part in order to increase a flow rate of the high-pressure refrigerant, and an oil suction flow path merging with the refrigerant-accelerating flow path.

Abstract: There is disclosed a scroll compressor capable of improving the oil separating device of a refrigerant gas discharged from a scroll compression element to effectively suppress the amount of oil to be discharged through a discharge tube. The scroll compressor has, in a sealed container, a scroll compression element, a motor element which drives the scroll compression element, and a support frame having a bearing portion which keeps a shaft of the motor element, and provided with a communication path. The scroll compressor further includes a shield plate which extends from the support frame to the motor element side to surround the periphery of the bearing portion, and a guide member provided at an outlet of the communication path to guide the discharged gas in the direction of the shield plate.

Abstract: A compressor may include a shell assembly, a first scroll member, and a second scroll member. The first scroll member may be located within the shell assembly and may include a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may define an oil groove extending into the first side. The second scroll member may be located within the shell assembly and supported for orbital movement relative to the first scroll member. The second scroll member may include a second end plate and a second spiral wrap extending from the second end plate and meshingly engaged with the first spiral wrap to form compression pockets.

Abstract: A scroll compressor and a refrigerating machine including the same are provided. In the scroll compressor, an oil supply hole formed in an orbiting scroll guides oil from a space between a frame and the orbiting scroll to a space between a fixed scroll and the orbiting scroll, and an oil supply groove formed at the fixed scroll maintains communication with the oil supply hole, thereby rapidly supplying oil to a bearing surface between the fixed scroll and the orbiting scroll before the oil is introduced into a back pressure chamber. This enhances compressor efficiency by effectively preventing frictional losses and refrigerant leakage in such a compressor, and enhances energy efficiency for a refrigerating machine using such a compressor.

Abstract: In a motor-driven scroll type compressor, a rotary shaft includes a first opening at a position adjacent to a front end of the rotary shaft and facing an inner surface of a bearing for rotatably supporting the front end of the rotary shaft, a second opening at a position adjacent to a rear end of the rotary shaft and communicating with a back pressure chamber provided in front of a movable scroll member in a housing of the compressor, a communication passage interconnecting the first opening and the second opening, and a throttle formed by a clearance between the first opening and the inner surface of the bearing.

Abstract: An oil-free scroll compressor prevents wraps from being broken and provides improved reliability. The oil-free scroll compressor includes an orbiting scroll member and fixed scroll members, and has compression channels into which water is injected each formed between the intake port and exhaust port provided in the fixed scroll member. The oil-free scroll compressor includes temperature sensors each of which detects temperature in the compression channel, regulating valves each of which controls ratio of the amount of the water to be injected into the respective compression channels to the total amount of the water to be injected into the compression channels, and controller which controls the opening degrees of the regulating valves such that a difference between the detected temperatures from the compression channels is small.

Abstract: A scroll compressor and assembly includes a suction duct to direct refrigerant from the housing inlet to a location upstream of a motor. Additionally, the suction duct includes drain ports that act to drain oil received in the suction duct into the oil sump. This can be used for filling and charging the oil sump with oil initially by using the common refrigerant inlet port through the housing and also acts to collect coalesced oil from oil mist generated by operation of the scroll compressor in a refrigeration system and likewise drain the lubricant oil into the lubricant sump.

Abstract: A scroll compressor includes a back pressure chamber oil-feeding path for feeding lubricating oil from a high-pressure region to a back pressure chamber, and a compression chamber oil-feeding path for feeding lubricating oil from the back pressure chamber to a compression chamber. One phase in which the back pressure chamber oil-feeding path is communicated from the high-pressure region to the back pressure chamber and another phase in which the compression chamber oil-feeding path is communicated from the back pressure chamber to the compression chamber are shifted from each other, so that the back pressure chamber oil-feeding path and the compression chamber oil-feeding path are never put into the communicating state simultaneously.

Abstract: A compressor incorporated with an oil separator having a separation chamber and communication holes. The separation chamber is placed adjacent to a discharge chamber, has a space formed in the entire inside of the separation chamber, separates oil-containing gas, which is introduced into the separation chamber, into gas and oil by centrifugal separation, allows the separated oil to drop downward, and upwardly extracts the separated gas. The communication holes interconnect the discharge chamber and the separation chamber and introduce the oil-containing gas, coming from the discharge chamber, into the separation chamber. The communication holes are arranged in the separation chamber, in a direction extending from a gas release side to an oil drop side. The structure of an oil separation section is simplified to improve productivity and reduce cost, and a high degree of design freedom of the position of a discharge port is obtained.

Abstract: The expander-compressor unit 70 includes the closed casing 1, the expansion mechanism 4 disposed in the closed casing 1 so that a surrounding space thereof is filled with the oil, the compression mechanism 2 disposed in the closed casing 1 so as to be positioned higher than the oil level, the shaft 5 for coupling the compression mechanism and the expansion mechanism 4 to each other, and the oil flow suppressing member 50 disposed in the surrounding space of the expansion mechanism 4 so that the space 55a filled with the oil is formed between the expansion mechanism 4 and the oil flow suppressing member 50. Thereby the flow of the oil filling the inner reserving space 55a is suppressed, and thus, heat transfer from the high temperature oil to the low temperature expansion mechanism can be reduced.

Abstract: An electric compressor (201) includes: a compressor (203) configured to compress a refrigerant, the compressor (203) having a plurality of passage ports (207) delivering the refrigerant; an electric motor (205) configured to drive the compressor (203), the electric motor (205) having a plurality of stators (17) and an accommodation chamber (213) accommodating the plurality of stators (17); a partition wall (215) separating the compressor (203) and the an accommodation chamber (213) of the electric motor (205); and a plurality of refrigerant introducing/discharging passages (219) formed at the partition wall (215) wherein the respective refrigerant introducing/discharging passages (219) are located in a circumferential direction of the accommodation chamber (213), thereby the refrigerant being introduced into and discharged from stators (17) end in the electric motor (205) through the respective refrigerant introducing/discharging passages (219).

Abstract: A fluid machinery includes a rotary mechanism, an annular back pressure chamber and an oil passage. The rotary mechanism includes first and second cooperating members, each including an engaging member extending from an end plate, with the cooperating members being arranged to oscillate relative to each in order to change volumes of operation chambers formed between the cooperating members. The annular back pressure chamber is formed on the back surface side of the end plate of the first cooperating member, and communicates with an intermediate operation chamber of the operation chambers to thrust the first cooperating member against the second cooperating member. The intermediate operation chamber is in an intermediate pressure state. The oil passage is arranged to communicate an oil into the back pressure chamber to fill the back pressure chamber with the oil. The rotary mechanism can include a piston and cylinder, or can include a fixed and orbiting scroll.

Abstract: A suction screen member is provided that bridges the inlet port and entrance port between a compressor housing and a suction duct in a scroll compressor. The suction screen member also serves to screen fluid entering the scroll compressor to prevent particulates from entering the scroll compressor. The suction screen member may be formed from only two components, including a sheet metal body that has a folded over section to provide a mounting segment that mounts into the inlet fitting for the outer housing and a tubular extension. Crimping of the folded over segment can secure the screen thereto. Other embodiments may have employ welding for screen attachment.