Abstract: A compressor including an oil separator connected to a supply of compressed air, the oil separator including a chamber having a wall defining a cavity within the chamber, and a vent within the wall, wherein the vent is in communication with the supply of compressed air at a first end, and in communication with the cavity via a second aperture, and extends substantially parallel to an externally-facing surface of the wall.

Abstract: An expander-integrated compressor (100) includes: a compression mechanism (2) for compressing a working fluid; an expansion mechanism (3) for expanding a working fluid; and a shaft (5) that couples the compression mechanism (2) and the expansion mechanism (3). The expansion mechanism (3) includes a variable vane mechanism (60). The variable vane mechanism (60) controls the movement of a first vane (48) so that the ratio of a period P2 to a period P1 (P2/P1) can be adjusted, where P1 denotes the period during which the first vane (48) is in contact with a first piston (46) in the course of one rotation of the shaft (5), and P2 denotes the period during which the first vane (48) is spaced from the first piston (46) in the course of one rotation of the shaft (5).

Abstract: A gas vane pump wherein a lubricant is intermittently introduced into a housing during rotation of a rotor, through a supply passage formed through the housing and the rotor, and the relative position between the rotor having a diametric hole and the housing having a communication groove is determined such that when the rotor is at an angular position in the middle of a predetermined angular range relative to the housing and the hole is in communication with the groove, a point of contact between a vane movably held by the rotor and the inner circumferential surface of the housing is located at the lowest position of the inner circumferential surface. When the rotor is stopped within the predetermined angular range, the vane divides the remaining lubricant into two portions, which are discharged at different times, making it possible to reduce the load on the vane upon restarting the pump.

Abstract: To reduce an excessively high vane back pressure to an appropriate pressure to thereby relieve operational load, and to improve the vane projectability at the start and during low speed operation to thereby prevent chattering; There are provided back pressure spaces including the bottom portion of vane grooves and attaining a middle pressure between suction pressure and discharge pressure during normal operation of the compressor main body, a first high pressure oil passage establishing communication between an oil sump and the vane groove bottom portions when the vanes are in their discharge stroke positions, second high pressure oil passages establishing communication between the oil sump and the back pressure spaces, and an opening/closing valve for opening and closing the second high pressure oil passages.

Abstract: A gas compressor has a cylinder in which a refrigerant gas is compressed and a side block mounted to an end surface of the cylinder. The side block has suction holes each having a first end opening to an outer surface of the side block and a second end opening into the cylinder. A front head has a suction port, an inner surface, and a hollow portion disposed in the inner surface. The front head is disposed on an outer surface of the side block so that the hollow portion and the outer surface of the side block form suction passages extending from the suction port to respective suction holes of the side block. Each of the suction passages form a main flow passage along which refrigerant gas flows from the suction port to a corresponding one of the suction holes of the side block. The hollow portion has a generally flat wall surface at a region corresponding to each of the main flow passages.

Abstract: A rotary vane gas compressor has a cylinder, a rotor in the cylinder, and vanes slidably disposed in radial vane grooves in the rotor to define compression chambers for intaking, compressing and discharging compressed gas during rotation of the rotor. A flat groove communicates with bottom portions of the vane grooves during intaking and compression of the gas in the compression chambers, and a high pressure supplying hole communicates with the bottom portions of the vane grooves during end stage compression of the gas at times when the bottom portions of the vane grooves are not in communication with the flat groove. A communication passage establishes communication between the flat groove and the high pressure supplying hole at the start of operation of the gas compressor to supply high pressure gas to the vane groove bottom portions during start-up to quickly urge the vanes into contact with the cylinder.

Abstract: To provide a gas compressor improved in terms of the vane projectability at the start of the compressor. To achieve the above object, there is provided a communication passage establishing communication between a high pressure supplying hole and a flat groove at the start of the compressor, and high pressure refrigerant gas discharged into the high pressure supplying hole at the start of the compressor is supplied to the flat groove, whereby high pressure refrigerant gas is supplied to vane groove bottom portions, making it possible to improve the projectability of vanes.

Abstract: An oil storage area (45a) is defined on the bottom of a motor chamber (45) of a scroll compressor (1). An oil transfer route (4a) is defined in the portion of a center housing (4) that corresponds to the storage area (45a). Lubricating oil L is separated from the discharged, compressed refrigerant by an oil separator (80) and the lubricating oil L is supplied to the backside of a movable scroll (20) due to a pressure differential within the compress (1). After lubricating a bearing (10), the lubricating oil L is temporarily stored in the storage area (45a) and then is transferred due to a pressure differential to the suction-side of a compression mechanism (21) via the oil transfer route (4a). The lubricating oil L is then transferred to the oil separator (80) together with the compressed refrigerant that is discharged from a compression chamber (32) of the compression mechanism (21).

Abstract: To abolish the O-ring for sealing the space on the rotor shaft rear end surface side. There are provided at the ends of a tubular cylinder a front side block and a rear side block, and a rotor rotatable by a rotor shaft is arranged in a cylinder, there being formed in the rotor vane grooves in which vanes are accommodated so as to be capable of advancing and retreating and vane back pressure chambers, there being further provided a high pressure chamber and an oil sump portion, a lubricant oil space being provided in the rear side block and on the rear end surface side of the rotor shaft, there being provided an oil supply passage for supplying oil to the lubricant oil space from the oil sump portion, there being provided in the rear side block or in the rotor shaft a vane back pressure chamber oil passage 40 whose one end communicates with the oil accommodating space and whose other end communicates with the vane back chambers.

Abstract: A rotary screw type pump is provided with internal cavities within the rotors. The rotors include shaft portions that extend out from the casing that contains the screw portion of the rotors. The cavities extend from the screw portion of the rotors at the compression side of the casing to the shaft portion of the rotors. The cavities are charged with a fluid and may include a porous wick in order to act similar to a heat pipe for removing the heat generated during pump compression. The heat is transferred to the shaft portion of the rotors. The shaft portion of the rotors extend into a cavity that contains a coolant. A water jacket surrounds the cavity. The heat is transferred from the shaft portion of the rotors to the coolant and then the water jacket for removal. The heat transfer from the shaft portions to the coolant may be facilitated with the use of fins.

Abstract: The invention concerns an oil-sealed vane-type rotary vacuum pump with a suction chamber (8) housing a rotatably mounted rotor (3) which has an anchoring section (21) and a bearing section (23) with a slot (24) in which two vanes (26) are mounted with a space (28) between them. The rotor bearing (3) comprises the bearing section (23) and a rotor-mounting bore (11). The vacuum pump also has an oil pump (45, 46), which produces a flow of oil through the space (28) between the vanes, and a system for controlling the flow of oil through the space (28), the oil passing through a channel (66) opening out in the rotor-mounting bore (11) and then through radial and longitudinal bores (68, 69) in the bearing section (23) of the rotor.

Abstract: A rotary sliding-vane compressor is described which contains a single rotor with compressor and expander sections, together with a reduced number of parts and efficiency improvements compared to conventional compressors.

Abstract: A vane-type rotary refrigerant compressor adapted for use in an air conditioning system is disclosed which includes a rotor fixed on a drive shaft for rotation therewith and disposed in an elliptical chamber of a cylinder block which is enclosed by a housing and whose axial ends are closed by front and rear side plates. The rotor has a plurality of slots in which vanes are slidably received so that a plurality of compression chambers are formed during the operation of the compressor. An oil separator compartment is defined by the housing and the rear side plate, communicating with a discharge chamber into which compressed refrigerant is discharged. In the rear side plate is formed a discharge passage establishing communication between the discharge chamber and the oil separator compartment. The discharge passage has a restricted portion and a bend so as to provide resistance against the flow of the compressed refrigerant for damping its pulsating stream.

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

Abstract: In a fluid compressor, a cylinder is arranged within a sealed casing. A piston having a spiral groove is placed within the cylinder. The piston is made eccentric to the cylinder such that part of the piston is put in contact with the inner peripheral surface of the cylinder. The piston and the cylinder are rotated relative to each other. A spiral blade is fitted in the spiral groove. The blade is put in contact with the inner peripheral surface of the cylinder, and forming a plurality of working chambers. The blade freely projects from and retreats in the groove. A fluid to be compressed is sucked in the working chambers. The compressed fluid is discharged from a discharge hole portion into the sealed casing. A support mechanism supports the cylinder and one of bearing members for supporting shaft portions of the piston. The support mechanism receives the lubricating oil mixed in the high-pressure compressed fluid discharged from the discharge hole portion.

Abstract: A compressor having a cylinder and a cylindrical rotational body housed within the cylinder. A spiral groove is formed in the outer peripheral surface of the rotational body, and a spiral blade is fitted in the groove so as to be freely retreated in and projected from the groove in the radial direction of the rotational body. The cylinder and the rotational body are rotated relative to each other by a drive mechanism. A fluid to be compressed is introduced into working chambers defined by the blade, the inner peripheral surface of the cylinder and the outer peripheral surface of the rotational body. The fluid is first guided into the first working chamber from a gas suction port, and then into the second and subsequent working chambers successively, whereby the fluid is compressed. An oil supply mechanism supplies pressurized oil to an oil supply hole formed in the rotational body.

Abstract: In a sliding vane type compressor including a cylinder having a cylindrical inner wall, a rotor disposed within the cylinder and having a vane slot, and an oil supply means for feeding oil during the rotation of the rotor to the vane backpressure chamber of the vane inserted slidably into the vane slot, refrigerating gas within the refrigeration cycle is used as vane backpressure means, which providing a gas passage opening, closing means is provided in a passage for supplying the gas, the gas passage being shut off during the steady operation of the compressor to cause the oil supply amount to be proper into the vane backpressure chamber to improve the durability and efficiency of the compressor.

Abstract: A rotary vane compressor has a cylinder having an oval-shaped compartment in which is rotatably mounted a rotor. Front and rear side blocks close the opposite ends of the cylinder. A plurality of vanes are slidably mounted in slots formed around the rotor and divide the cylinder compartment into expansible working chambers. A gas inlet opening is disposed at the upstream end of each working chamber for admitting a gas to be compressed and a gas outlet opening is disposed at the downstream end of each working chamber for discharging the compressed gas. A source of pressurized lubricant oil is fed to the base of the vane slots to bias the vanes outwardly so that the vane tips slidably engage the inner wall of the cylinder compartment during rotation of the rotor.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: A compressor of the rotary vane type including an annular space dormed inside a rotor for communicating vane slots formed in the rotor in communication with one another and for storing lubricant therein. As vanes each received in one of the vane slots move in radial sliding reciprocatory movement in the respective vane slots, the vanes are lubricated at their surfaces by the lubricant.

Abstract: The compressor is characterized by a high pressure port provided in a rear plate at a position that the bottom portion of a vane groove of a vane which reaches a delivery port contacts the high pressure port, and low pressure ports provided, independently of the high pressure port, in the front and rear plates at positions so that the low pressure ports communicate with the high pressure port through the bottom portion of the vane groove of the vane between the low and high pressure ports only when the center of said vane groove is disposed between the high and low pressure ports so that the high pressure is fed intermittently to the low pressure port. In a region of rotation of the rotor where vane-tip pressing force is small, a high pressure from the high pressure port is applied to vane grooves as vane back pressure, and in the other region a relatively low pressure is applied thereto from the low pressure ports.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: A sealing chamber is defined between the front head and the front side block, and an oil chamber between the rear side block and a partition member secured to the rear end face of the rear side block, respectively. The drive shaft, on which the rotor is rigidly fitted, is radially supported by a pair of roller bearings provided at the front and rear side blocks. The bearings have end portions remote from the rotor enclosedly disposed in the sealing chamber and the oil chamber. The lubricating oil feeding system includes lubricating oil feeding bores formed in the front and rear side blocks and communicating with a zone under discharge pressure, and clearances between the front and rear side blocks and opposed end faces of the rotor. The clearances have predetermined flow resistance, and communicate, on one hand, with the back pressure chamber formed within the rotor, and on the other hand, with the sealing chamber and the oil chamber by way of the above roller bearings.

Abstract: A sealing chamber is defined between the front head and the front side block. The drive shaft on which the rotor is rigidly fitted is journalled by front and rear plain bearings provided on the front and rear side blocks, respectively. The bearing on the front side has an end portion remote from the rotor enclosedly disposed in the sealing chamber. The sealing chamber communicates in a direct manner with the suction port formed in the compressor casing by way of a passage means so as to be supplied in a direct manner with suction refrigerant having a low temperature and a low pressure.

Abstract: A method and apparatus for lubricating a vacuum pump, preferably a rotary vane vacuum pump, wherein the pump rotor is mounted on a hollow drive shaft continuously fed with a lubricating oil stream under excess pressure from an oil pump, radial openings being provided in the hollow shaft for the outward supply of lubricating oil to the elements being lubricated with the lubricating oil stream from said oil pump being fed under excess pressure as a pulsating and preferably intermittent flow stream into the interior of the hollow shaft.

Abstract: The front and rear side blocks are each formed therein with a first lubricating oil passage which supplies high pressure lubricating oil, and at least one of the side blocks is formed therein with a second lubricating oil passage communicating with the back pressure chamber formed within the rotor. The first and second lubricating oil passages each open at one end in the sliding peripheral surface of a plane bearing formed with the corresponding side block. The drive shaft has its interior formed with a lubricating oil chamber and its peripheral wall formed with at least one lubricating oil feeding hole communicating with the lubricating oil chamber.

Abstract: A multi-vane type compressor formed with vane back pressure spaces having introduced thereinto a suction gas pressure in the suction and compression strokes and a discharge gas pressure in the discharge stroke. The compressor includes supply grooves for introducing the discharge gas pressure into the vane back pressure spaces, which are each split into a trailing side portion and a leading side portion. Each leading side portion for coping with the terminating stage of the discharge stroke is exposed to the discharge gas pressure via a passageway offering large resistance to the flow of fluid, to throttle the gas forced out of the vane back pressure spaces as the vanes are forced into vane grooves to thereby raise the vane back pressure. This is conducive to prevention of the jumping action of the vanes, and wear of the tips of the vanes and to minimization of vibration and noise.

Abstract: A vane type rotary compressor has a housing and end plates secured thereto to cooperate therewith to define a cylindrical bore in which a rotor is eccentrically mounted for rotation with vanes slidably mounted in vane grooves formed in the outer periphery of the rotor. A lubricant groove is formed in the inner surface of one end plate and so disposed as to be brought into communication with the inner end portions of the vane grooves pertaining to vanes defining working chambers when in their intake phases. The lubricant groove is connected by a passage with a discharge chamber of the compressor so that fluid pressure is fed into the inner end portions of the vane grooves to urge the vanes into sealing engagement with the inner peripheral surface of the cylindrical bore. A valve is provided to disconnect the discharge chamber from the lubricant groove during normal compression operation of the compressor.

Abstract: A vane compressor is provided which includes a rotor which has an internal space formed at its central portion and communicating with a plurality of vane-inserted slits formed in its outer peripheral surface, and first and second axial through holes extending from the internal space to its opposite end surfaces. The drive shaft extends through an end wall member of the pump housing and has its end portion rigidly fitted in the first axial through hole of the rotor. The second axial through hole of the rotor receives a support shaft projecting from the other or opposite end wall member of the pump housing. Thus, the rotor is radially supported at its one end by the drive shaft and at its other end by the support shaft, respectively.

Abstract: A rotary compressor including a housing having therein a cylindrical bore, and end plates closing opposite ends of the bore and supporting a rotary shaft supporting in turn a rotor formed with a plurality of circumferentially spaced vane grooves. A vane is slidably received in each vane groove and cooperates with the adjacent vane to define therebetween a working chamber. An oil groove is formed on a surface portion of one of the end plates which surface portion is located opposite to a path along which the bottoms of the vane grooves pass, at least in a position where the working chamber has its volume increased. A cover is attached to the one end plate to define therebetween a discharge chamber receiving therein fluid compressed by the vanes. A passage communicates an oil revervoir defined at the bottom of the discharge chamber and the axial end face of the shaft opposite to the one end plate with each other.

Abstract: A rotary compressor comprises an open-ended cylinder having its open ends closed by end plates and an eccentrically rotatable rotor housed inside the cylinder. A hydrodynamic seal is provided on either the rotor or each of the end plates for minimizing any possible unwanted leakage of lubricant oil.

Abstract: An improved vane type rotary compressor provided with a control mechanism of a lubricating oil supply passage by which the lubricating oil supply passage is arranged to be opened during operation of the compressor, and to be closed during shut-down of the compressor for obtaining a sufficient amount of lubricating oil supply during operation and also for preventing reverse rotation during shut-down of the compressor.

Abstract: A rotor (18) is disposed in a bore (14) of a cylinder (13) and carries vanes (33), (34), (36), (37) in radial slots (28), (29), (31), (32), the vanes (33), (34),(36), (37) being urged into engagement with the wall of the bore (14) by oil pressure applied to inner ends of the vanes (33), (34), (36), (37). The cylinder (13), rotor (18) and vanes (33), (34), (36), (37) are configured to displace refrigerant fluid or the like through the bore (14) from an inlet (19), (21) to an outlet (22), (23) upon rotation of the rotor (18). The trailing outer edges (28a') of the slots (28), (29), (31), (32) are chamfered, thus reducing frictional resistance between the vanes (33), ( 34), (36), (37) and slots (28), (29), (31), (32) to radial movement and producing a reservoir (28c') for oil forced through clearances between the slots (28), (29), (31), (32) and vanes (33), (34), (36), (37).

Abstract: A vane compressor includes a hollow stator, and a rotor which is received in the stator for rotation about an axis. The rotor is provided with a plurality of throughgoing passages which extend radially and outwardly relative to the axis. Each passage receives a vane which has an outer end face directed towards an inner circumference of the stator and an inner end face directed away from the inner circumference of the stator. The vanes are shiftable radially in the respective passages relative to the axis. A pressure medium is supplied under a first pressure to the inner end faces of the vanes to urge the same radially outwardly for engagement of the outer end faces with the inner circumference of the stator. When the rotor is rotated, the vanes are subjected to an additional second pressure resulting from centrifugal force. The second pressure additionally urges the vanes against the inner circumference of the stator.

Abstract: A rotary vacuum pump is provided with a housing having a cylindrical chamber. A rotor having a plurality of slideably mounted vanes is mounted within the chamber by a shaft extending through an eccentric bore. Hydraulic oil delivered to the rotor under pressure urges the vanes against the chamber walls. Escaping oil lubricates and seals the vanes and also lubricate the rotor shaft.

Abstract: A rotor is eccentrically mounted in a bore of a housing and formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet passageway leading to an outlet port. The high pressure in the outlet passageway forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. In a first embodiment of the invention a check valve blocks the outlet port until the pressure in the outlet passageway reaches a level sufficient to sealingly press the vanes against the wall of the bore, thereby increasing the speed of pressure buildup in the outlet passageway.

Abstract: A reverse Brayton cycle rotary vane cooling system having a compressor and an expander driven by a common shaft. The cooling system includes a plurality of vanes made of a carbon epoxy plastic composite with bearing support inserts molded into the plastic composite. A bolt passes through the bearing support inserts and plastic composite. Oil is supplied to the vane slots with any oil passing into the cooling gas being removed by oil separators.

Abstract: A rotor is operatively provided in a bore of a cylinder which is formed with an inlet and an outlet. The cylinder is enclosed by a housing with an annular chamber being defined between the cylinder and the housing. The housing has an inlet which is connected to the inlet of the cylinder. The outlet of the cylinder is provided at an upper portion thereof. An oil sump is defined by a lower portion of the annular chamber of the housing. A partition divides the interior of the housing into the annular chamber within which the cylinder is disposed and an outlet chamber which communicates with an outlet of the housing. The lower portion of the partition is cut away to communicate the annular chamber with the outlet chamber.

Abstract: A rotor is eccentrically mounted in a bore of a housingand formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet passageway leading to an outlet port. The high pressure in the outlet passageway forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. In a first embodiment of the invention a check valve blocks the outlet port until the pressure in the outlet passageway reaches a level sufficient to sealingly press the vanes against the wall of the bore, thereby increasing the speed of pressure buildup in the outlet passageway.

Abstract: A rotor is eccentrically mounted in a bore of a housing and formed with radial slots in which vanes are slidably retained. An oil passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet passageway, the oil sump communicating with an oil separation chamber which constitutes part of a fluid outlet passageway. The high pressure in the oil separation chamber forces oil through the oil passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet passageway into the bore and entrained in the working fluid lubricates the outer ends of the vanes and flows into the oil separation chamber. The fluid outlet passageway is formed so that the fluid flow path reverses direction in the oil separation chamber. The oil entrained in the fluid is unable, due to its higher density and inertial force, to negotiate the reversal of direction, is thereby separated from the fluid and returned to the oil sump.

Abstract: A rotor is eccentrically mounted in a bore of a housing and formed with radial slots in which vanes are slidably retained. A lubricant passageway leads from an oil sump through the radially inner portions of the slots to a fluid inlet, the oil sump communicating with a fluid outlet. The high pressure in the outlet forces oil through the lubricant passageway to lubricate the vanes and urge the vanes into sealing engagement with the inner wall of the bore. Oil sucked from the inlet into the bore lubricates the outer ends of the vanes and is recovered at the outlet and returned to the oil sump. A check valve at the inlet closes when the compressor is stopped to prevent discharge of fluid and oil out the inlet. An equalizing valve acting integrally with the check valve connects the inlet to the outlet when the compressor is stopped to prevent oil from filling the inlet.

Abstract: A rotary, sliding vane compressor is provided with means for supplying a relatively small, predetermined quantity of an incompressible fluid, such as lubricating oil, underneath the vanes. The fluid is injected at a point while the vanes are collapsing within the vane pockets formed within the rotor and is trapped underneath the vane during its movement to the contact point thereby resisting the collapse of the vane so as to hold the vane tip in continuous engagement with the stator surface in the compression cavity. The means for supplying the fluid underneath said vanes includes a device for interrupting flow of lubricant from a sump to the interior of the compressor housing thereby controlling or metering the lubricant and also preventing reverse rotation of the compressor rotor caused by oil pressure under the vanes forcing the vane tips to follow the curvature of the cylinder wall in a backward direction.

Abstract: A rotary positive fluid displacement machine wherein the radially reciprocable sealing vanes are hydraulically coupled to each other at their innermost ends for preventing the occurrence of compression opposition to radial retraction of the vanes and for urging radial outward movement of the vanes.

Abstract: A rotary compressor assembly constructed to prevent leakage from the compressor housing to atmosphere through the interface between the cylindrical section and the covers of the housing.The compressor is disposed substantially within the tank which receives the compressor discharge and is connected to the wall of the tank. A seal between the compressor and the tank wall seals the tank and thereby prevents leakage from the compressor to atmosphere.