Abstract: A system and method of pumping liquified gas. Applicants systems includes a liquified gas storage vessel and a smaller high pressure high pressure liquified gas storage cylinder. Applicant provides a pump between the two vessels for pumping the liquified gas from one vessel to the other. Applicants system also includes at least one heat exchanger through which the liquified gas passes as it is pumped from one vessel to the other, which heat exchanger cools the liquified gas that is being pumped to a temperature typically below the vaporization point of the gas.

Abstract: In an apparatus for the treatment of metallic workpieces (4) with cooling gas, having a cylindrical housing (3) with an opening at the end face for introducing and removing the workpieces (4), two support plates (6, 7) extending in parallel planes vertically in the housing (3) and two air-guiding plates (14, 15) are provided, the workpiece batch (4) being held between the support plates (6, 7), and the air-guiding plates (14, 15) each forming, with the adjacent support plates (6, 7) and with the respectively adjacent inner wall of the housing, shafts (16, 17 and 26, 27, respectively) through which the cooling gas conveyed by blowers held on the housing (3) flows, controlled by reversing flaps (18, 19, 20, 21) arranged at the upper and lower ends of the air-guiding plates (14, 15).

Abstract: A scroll-type fluid machine such as a scroll compressor or a scroll vacuum pump generates compression heat during compressing operation. A scroll body comprises a stationary scroll and an orbiting scroll that is revolved with respect to the stationary scroll eccentrically. The stationary scroll has a stationary wrap and the orbiting scroll has an orbiting wrap engaged with the stationary wrap to form a compression chamber therebetween. In the scroll-type fluid machine, a cooler is provided to cool high-temperature compressed air discharged from a discharge bore at the center of the stationary scroll.

Abstract: A closed-drift Hall effect plasma vacuum pump includes one or more pumping conduits which are linked with a radial magnetic field. The magnetic field separates a plasma from a plasma at a higher pressure which is formed by cross-field plasma transport from a plasma processing region.

Abstract: A mounting flange for housing a bearing cup of a roller bearing is disclosed. The mounting flange includes a recess sized to receive the bearing cup. A radial wall is defined by the recess and an outer periphery of the mounting flange. The radial wall includes at least one region of greater radial thickness than the radial thickness at another region. The at least one region of radial thickness defines at least one ear. The mounting flange also includes at least one flexibility pocket in the at least one ear. The flexibility pocket is configured to provide substantially uniform, radial deformation to the mounting flange when the bearing cup is fit into the recess.

Abstract: A fuel pump is provided that is submersible within a fuel, for example, within a fuel tank of an automotive vehicle and is particularly suited for use with high alcohol content fuels that tend to contain ionic species. The fuel pump comprises an electric motor that includes a commutator and a negative brush electrode that is connected to a negative terminal of an external power supply. The electric motor is at least partially disposed within a metal shell that is in contact with the fuel. The metal shell is also connected to the negative terminal of the external power supply. During operation, a negative electrical potential is applied to the metal shell to preferentially react with ions within the fuel. In this manner, the metal shell serves as a anode to reduce the concentration of ionic species in the fuel, thereby decreasing reactions with the brush electrode and extending the useful life of the fuel pump.

Abstract: An impeller pump with thermostatically adjustable guide vanes is suitable for use as an automotive coolant pump. The pump is driven by a constant speed electric motor, and flow variation is controlled by varying the orientation of the vanes. Orientation of the vanes is effected by a wax-type thermostat, which senses coolant temperature: flow is increased when the coolant is hot, and decreased as the coolant cools. The variable guide vanes are mounted for pivoting about radial axes, and are located just upstream from the pump impeller.

Abstract: Apparatus for inducing, impeding, selectively filtering or otherwise effecting fluid flow in microfluidics applications. Opposing mesh layers are placed into relative motion by a variety of motive forces. Fluid between the opposing mesh layers is compressed so as to be pumped through the mesh layers when the relative motion of the layers is toward each other. Mesh layers may also be offset from each other though an actuating force so that one mesh layer blocks the openings in the other mesh layer, thereby creating an impediment to fluid flow. The degree of offset may be varied so as to create a partial impediment to fluid flow, thereby presenting a filter effect.

Abstract: A pump for gases to be measured having a pump housing in which a pump chamber is located. The pump chamber is sealed off by a working membrane that is connected to a crank drive by a connecting rod or similar lifting mechanism. A heating device is provided in an upper area of the pump housing, particularly in the pump head. Heat insulation covering at least the pump head is provided. The heat insulation is in the form of an insulating housing having an inner wall spaced apart from the pump head in order to form a gas insulation layer.

Abstract: A system for controlling and monitoring a rate of flow of a fluid, such as a CMP slurry, comprising a pump for pumping the slurry; a flow meter for monitoring the rate of flow of the slurry; and a controller operably connected to the flow meter and the pump. The controller receives signals from the flow meter indicating the rate of flow of the slurry and controls the operational speed of the pump responsive to the flow meter signals. A degasser equipped with a level sensor may be further provided in the system for removing gas bubbles from the slurry.

Abstract: The invention concerns a metering gear pump comprising a set of gears supported and guided solely by the inner peripheral surface of the lobe of the chamber wherein they are housed. They do not comprise any shaft to act as support or guide, thereby enabling to reduce significantly useless spaced difficult to rinse when changing the product to be pumped. For the same purpose, the driving shaft is flexibly connected to the driving gear. Such arrangement provides the advantage of requiring only one single packing seal. Such a pump, connected to a drive motor and an encoder delivering a signal proportional to the number of pump cycles, enables to provide an accurate metering pump for numerous uses.

Abstract: A resistive muffler attenuates sound generated by the gas intake and suction valve during compressor operation of a refrigerant compressor. The resistive muffler is assembled inline with the suction gas flow of the compressor and is positioned within the compressor housing. The resistive muffler attenuates the sound generated by the compressor during its operation as refrigerant gas is drawn into the compressor from an evaporator and passes through the resistive muffler in transit to the suction valve and hence to the region of the compressor where the gas is physically compressed. The resistive muffler includes a muffler housing having an intake end and an exhaust end. An acoustic foam assembly is incorporated into the muffler housing.

Abstract: A roots compressor module has a roots compressor accommodating drive and driven rotors in a rotor chamber of a compressor housing, an electric motor arranged coaxially with the drive rotor and having a motor housing fixedly connected to the compressor housing, a first device supported on one of the compressor and motor housings, a discharge passage formed in the compressor housing and extending from a discharge side of the rotor chamber in a direction perpendicular to an axis of the drive rotor, and a communication passage connecting the discharge passage with the first device. The first device is located by a side of the electric motor, while the communication passage extends from the discharge passage toward the first device along the axial direction of the drive rotor.

Abstract: A thermal oxidizer assembly for abatement of process emissions uses an abatement chamber where process emissions are abated generating heated gases. A converter is in fluid communication with the abatement chamber for receiving the heated gases from the abatement chamber. The converter includes a heat engine for converting thermal energy disposed in the heated gases to useable mechanical energy.

Abstract: A viscous seal for fluid transfer devices that deviates from the conventional wisdom of avoiding contact between the seal and a rotating drive shaft of the fluid transfer device. Instead of avoiding contact, contact between the seal and drive shaft is used to effect axial alignment of a sealing sleeve with the shaft. As a result, the viscous seal is compliant in that the sealing sleeve can follow the axis of the drive shaft. Accordingly, the sealing sleeve can fit snugly around the drive shaft for more effective prevention of leakage of low or any viscosity fluid along the drive shaft, but without any significant radial load being applied to the sealing sleeve that might cause undue wear or damage due to galling.

Abstract: An object of the invention is to minimize energy loss to be generated at a driving shaft and a shaft seal device, when an electric rotating device is driven by an expansion-and-compressor device. According to a feature of the invention, a first driving shaft is rotationally supported by a housing and transmits a driving force from an engine to a second shaft of the expansion-and-compressor device, wherein a shaft seal device is provided on the first driving shaft for air-tightly sealing the inside of the housing from the outside of the housing. A power transmission control device (electromagnetic clutch or one way clutch) is operatively provided in a path between the first driving shaft and the second shaft, so that power transmission from the second shaft to the first driving shaft is cut off, to suppress any energy loss to be generated between the first driving shaft and the shaft seal device.

Abstract: A system for automatically adjusting the audio level in response to spa jet pump and air blower settings in an audio system mounted in a spa or hot tub. A preferred embodiment includes a spa pump/blower sensor apparatus, and an electronic controller circuit which interfaces to the audio system and the spa pump/blower sensors.

Abstract: A pump for the transporting of fluids and/or of mixtures of fluids includes a housing (1) and at least one restrictor gap seal which is provided in the housing (1) to reduce the pressure in a restrictor gap along a rotatable part (2) of the pump, wherein the restrictor gap seal is formed as a brush seal arrangement (8). The brush seal arrangement (8) contains one or more individual brush seals (8′) which include as sealing members a plurality of sealingly arranged fibres, bristles and/or wires (8a) which are distributed and fastened in ring form and whose free ends extend towards the surface to be sealed.

Abstract: A crankshaft in a dual capacity compressor is disclosed, which causes oil contained in a lower portion of the compressor to flow up to an upper portion thereof with respect to all the rotational directions of a motor. A crank shaft (100) includes a driving shaft (110) inserted into a reversible motor (21, 22) for rotating along with the motor (21, 22), a balance weight (120) formed in a top portion of the driving shaft (110) for preventing vibration during rotation from occurring, a crank pin (130) formed on an upper surface of the balance weight (120) to be eccentric from the center of the driving shaft (110), and a regular/reverse oil path (140) formed along the balance weight (120) and the crank pin (130) for moving oil for forward rotation and reverse rotation of the motor respectively. The crankshaft serves to stably lubricate each driving part of the dual capacity compressor regardless of rotation direction.

Abstract: A crankcase heater mounting and compressor system that efficiently heats the oil sump fluid in an oil sump of a crankcase. A heater well is disposed in a substantially planar section in the lower housing shell of the crankcase. The inner surface of the heater well is substantially submerged in the oil sump fluid even at low oil sump fluid levels.

Abstract: A mobile concrete pumping vehicle including a reduced-weight boom arm. The pumping vehicle includes a boom arm that is extendible between a folded position and an extended position. The boom arm carries molded and fabricated composite boom pipe sections. Each pipe section is formed from a composite material having a reinforcing outer layer and a wear resistant inner layer. Preferably, the outer layer is formed using a filament winding process while the inner layer is molded of wear resistant urethane. Each boom section is formed by centrifugal molding a urethane tube then secondarily winding carbon fiber onto the exterior of the tube. The centrifugal force created by the rotating mold provides a bubble free urethane tube. The filament winding provides the hoop strength needed to withstand the internal pressures of the concrete pumping process.

Abstract: A suction and discharge valve arrangement for a small hermetic compressor of the type presenting a compression cylinder (1), which has an end closed by a valve plate (10) and which has a suction pipe (5) adjacent to the valve plate (10) and substantially orthogonal to the cylinder axis, the valve plate (10) being provided with a discharge orifice (11) substantially centralized in relation to the axial projection (20) of the internal contour of the compression cylinder (1), and with at least one suction orifice (12), which is internal to said axial projection (20) of the internal contour of the compression cylinder (1), and defining at least part of the extension of a suction passage (P), with an end opened to the inside of the compression cylinder (1) and an opposite end opened and connected to the suction pipe (5) by means of a transition portion (T), which is configured to minimize load losses.

Abstract: The present invention relates to a compressor. In one aspect of the present invention, a compressor is provided, including a cylinder having a compression chamber, a valve assembly mounted on one open end of the cylinder, and a head assembly on the valve assembly. The head assembly includes a suction muffler, a head plate, a head cover, a damping pipe, and a discharge muffler. The suction muffler includes at least one wing on an outside surface of an outlet part thereof, and the head plate includes a first cut away part for inserting the wing of the outlet part. The head cover is closed fastened to the head plate so as to press down the suction muffler. In the meantime, the head plate includes a recess for inserting the middle part of the damping pipe therein to hold the damping pipe, and the discharge muffler is fitted to one surface of the head plate to surround the damping pipe.

Abstract: The present invention provides a vehicle air compressor device which includes a motor device serving as a driving power source, a drier device conducted compressed air; the drier device arranged opposing to the motor device; and a supporting member for supporting the air compressor device to a vehicle at a portion where the motor device and the drier device is adjacent each other.

Abstract: A rotary blower with forced external air cooling having multiple interconnected and synchronized parallel multi-lobe rotors with the same number of straight lobes for propelling flow from a suction port to a discharge port of an inner casing without internal compression. The blower also has an outer cover with cooling air inlet and outlet openings and added centrifugal cooling fans mounted on the rotor shafts adjacent to the cooling air inlet openings for circulating cooling air through the space between the outer cover and the inner casing. The blower further utilizes wearable strip seal devices applied on the rotors for preventing internal leakage and accidental mechanical contact.

Abstract: In a fuel injection pump, a casing fixed to a housing has a pump room and a filter room mostly separated from but partly communicating with the pump room. A feed pump is constituted by the pump room where a feed pump mechanism is connected to an axial end of the drive shaft. A filter element is accommodated in the filter room. A casing cover easily attachable and detachable to the casing has a fuel inlet port through which fuel is sucked to the filter room and, then, flows via the filter element into the pump room where the fuel is pressurized according to rotation of the drive shaft. Accordingly, foreign material contained in fuel is eliminated before entering the pump room. Further, fuel flow area of the fuel element is larger than that of the fuel inlet port, resulting in less pressure loss of fuel passing through the filter element even if mesh size of filter element is smaller.

Abstract: The invention relates to the field of pumping units, and, in particular, to pumping units for extraction oil from oil wells. The oil well jet pumping unit comprises, all of them being installed on the piping string, a packer, a back pressure valve, a jet pump having the active nozzle, the mixing chamber, the diffuser and the central channel for supplying a passive medium, and a seal assembly. The back pressure valve is installed below the seal assembly, and a geophysical instrument is installed on the well-logging cable going through the seal assembly. The unit further comprises a filter and a perforator. The geophysical instrument is installed above the back pressure valve and below the jet pump, and the filter and the perforator are installed below the back pressure valve.

Abstract: A combined strainer and valve release structure formed as a unitary part of polyethylene with the strainer having a perforated wall and the valve release having a pushrod located on one side of the wall and an actuator tab located on the other side of the wall, with the pushrod in proximity to a movable member of an inlet check valve in a rest position and manually movable to an actuated position to dislodge the movable member when the movable member is adhered to a valve seat in the inlet check valve. The strainer moves the pushrod to the rest position when released from manual actuation.

Abstract: Suction gas feed assemblies to provide gas to a hermetic compressor are provided. The feed assemblies have capacity for reducing suction noise resulting from suction conduit vibration, valving operation, suction gas pulsing, or the like. The suction gas feed assemblies include a suction plenum in the form of a substantially cylindrical end cap or motor cap having substantially straight side wall, a contoured top wall, and a gas inlet aperture and suction conduit aperture which are configured to provide strong suction and motor cooling, with reduced superheat, suction pulsation, and noise attenuation. The motor cap has excellent structural stiffness and low sound radiation.

Abstract: A plant building includes a purification chamber and a pump chamber with a pump for cooling water. The pump chamber directly adjoins the purification chamber and the geometry of the pump chamber is such that disturbing swirls are avoided while the installation is in operation, due to the high speed of the coolant. The direct proximity of the two chambers to each other results in lower cost due to the elimination of the usual steadying zones.

Abstract: A hydrogen blower is provided and includes a housing having a drive unit and a compressor unit disposed therein. The drive unit is separated from the compressor unit by a neutral chamber, whereby the neutral chamber effectively seals the drive unit from the compressor unit. The drive unit includes a drive shaft, whereby the drive shaft extends generally between the drive unit and the compressor unit to selectively drive the compressor. In addition, the drive shaft fixedly supports a series of fan blades such that rotation of the drive shaft imparts a pressure on the neutral chamber to effectively seal the drive unit from the compressor unit. In this manner, the drive motor, compressor, and drive shaft may be packaged in a single housing while effectively sealing the drive unit from the compressor unit through cooperation between the fan blades and the neutral chamber.

Abstract: A fluid delivery system is provided having a disposable fluid reservoir that is integral with, and supported by, a pump housing. A peristaltic pump head is mounted within the pump housing. A length of flexible tubing is operatively engaged by the peristaltic pump, and includes a first end arranged in flow communication with the fluid reservoir and an accessible second end. A central portion of the tube is operatively engaged by the peristaltic pump head so that consecutive portions of the flexible tubing are successively collapsed to thereby propel fluid through the tubing so as to exit the second end. The disposable cartridge is preferably mateable with a recess in a base housing. A transmission system is mounted within the recess of the base housing and arranged to operatively engage the peristaltic pump head. A control module is disposed in control communication with the transmission system for selective operation of the fluid delivery system.

Abstract: A fluid cooling assembly comprising a compressor system, a frame structure, a cooler body, a fluid inlet in the cooler body fluidly interconnected to the compressor system, and a fluid outlet in the cooler body fluidly interconnected with the fluid inlet and the compressor system. The cooler body is pivotally movable about an axis away from the frame structure. The cooler body has a first and second edge, the first edge being located nearer the axis than the second edge. The fluid inlet and fluid outlet are located adjacent to the first edge of the cooler body, thus remaining fluidly interconnected to one another and the compressor system throughout movement of the cooler body toward and away from the frame structure.

Abstract: A system and method for reducing the collection of debris in a fluid pumping system. The system and method may be used in pools, spas, or other applications in which fluids are circulated through a fluid-containing vessel. The system includes a first pump that circulates fluid. A screen is coupled to the input of the first pump and acts to prevent debris from reaching the first pump. A second pump may be used to remove debris from the screen.

Abstract: An air treatment enclosure includes a housing having a fresh air inlet. A baffle is located at the inlet to cause the air to take a flow path having a 90° turn. The air also takes a 90° turn when flowing through an L-shaped plenum in the housing. The side walls and top wall and bottom wall are detachably connected together. A base manifold is located below the bottom wall.

Abstract: A vacuum pump is capable of preventing reaction products produced by a process gas from being precipitated in the pump, of holding various pump components in an allowable temperature range, and hence of operating in a wide operation range, and which has increased durability. The vacuum pump has a pump casing having an intake port and an exhaust port, an exhaust assembly disposed in the pump casing and having a rotor and a stator, and a heating unit for heating a stator side component of the exhaust assembly positioned near the exhaust port. The heating unit is disposed in a space inside the pump casing where is evacuated during operation, and held in contact with at least a portion of the stator side component of the exhaust assembly positioned near the exhaust port.

Abstract: An assembly for compressing gas that contains a guided rotor compressor into which gas and lubricant fluid is fed. The compressed mixture of gas and fluid produced in the compressor is first fed to a heat exchanger in which it is cooled; and the cooled and compressed mixture of gas and fluid is then fed to a separator.

Abstract: There is here disclosed a terminal protective device for a compressor to which a terminal cover can be attached and held stably. The terminal protective device comprises a terminal fence fixed to the outer surface of a hermetically sealed vessel so as to surround a terminal attached to the hermetically sealed vessel, and a terminal cover attached to the terminal fence so as to cover the terminal. The terminal cover has the shape of a substantially rectangular box and is held on its upper or lower surface as well as right and left surfaces by the terminal fence.

Abstract: An air compressor unit having an enclosure that permits adequate cooling air flow, and reduces the amount of noise that emanates from the air compressor unit. The enclosure has a partition that separates the interior of the enclosure into two compartments: a discharge compartment and a component compartment. A discharge aperture is in fluid flow communication with the discharge compartment. A compressor and motor are contained in the component compartment. The component compartment may be separated in a first compartment and a second compartment. Inlets allow cooling air to enter the enclosure, and a discharge aperture permits the cooling air to exit the enclosure. A blower draws cooling air into the enclosure through the inlets. An aftercooler is located between the compressor and the discharge aperture. The enclosure and compartments are configured to reduce the amount of direct “line of sight” noise that emanates from the air compressor unit.

Abstract: A hydraulic fluid reservoir for a hydraulic power system includes a reservoir housing having an internal chamber for containing a supply of hydraulic fluid, an outlet for communicating the fluid from the housing to an inlet of a hydraulic pump, and a return flow inlet for receiving a return flow of fluid into the chamber. The reservoir includes a flow diffuser having a diffuser inlet communicating with the return flow inlet for receiving at least a fraction of the return flow into the diffuser. The diffuser has an inner fluid guide wall that is preferably conical which diverges in the downstream direction in order to quiet any turbulence in the flow within the diffuser and to discharge into the bulk of the fluid into the chamber to be deaerated.

Abstract: A wine must pump (10) for pumping a wine product (23) such as must or pomace, has an intake port (14) for receiving the wine product (23), a discharge port (16) for discharging the wine product (23) under pressure, vacuum chamber (20), connected to the inlet port (14), for receiving and separating wine product (23) from air, a pressure valve (26) for allowing the wine product (23) to be removed from the vacuum chamber (20) and an air pump (18) for providing the vacuum and forced air. A thermal transfer unit (28) removes heat from air exiting the air pump (18) such that the wine product (23) is not harmed thereby. A demister (39) removes moisture from recycled air entering the air pump (18). Silencers (74), (76) and (86), and an air pump sound box (110), provide for the quiet operation of the wine must pump (10). Optionally, process air can be injected between the vacuum chamber (20) and the pressure valve (26) to prevent clogging at the bottom of the vacuum chamber (20).

Abstract: A valve for a hermetic compressor has a valve plate disposed between a cylinder block and a cylinder head. The cylinder block has a cylinder, and the cylinder head has a refrigerant suction chamber and a refrigerant discharge chamber, which are partitioned from one another by a partition. The cylinder head further has at least first, second and third plates of different thicknesses, a refrigerant suction passage for interconnecting the refrigerant suction chamber and the cylinder; and a refrigerant discharge passage for interconnecting the refrigerant discharge chamber and the cylinder. A suction valve opens and closes the refrigerant suction passage while being moved by pressure in the cylinder; and a discharge valve opens and closes the refrigerant discharge valve while being moved by the pressure in the cylinder.

Abstract: The invention relates to the field of petrochemistry, in particular to a method of compressing a gaseous hydrocarbon-containing medium, for example, different hydrocarbon gases including flares produced in the oil refining and petrochemical industries. A distillate of a rectifying column of an atmosphere-vacuum oil refining unit is fed as the fresh liquid working medium into a circulation loop of a liquid hydrocarbon-containing medium, which contains a liquid-gas jet device, a separator and a pump. The liquid hydrocarbon-containing medium is removed from the circulation loop to a cracking and rectifying unit in which the liquid hydrocarbon-containing medium is subjected to cracking with subsequent rectification in the rectifying column of that unit.

Abstract: A method for use of an oil-hydraulic fine filter of the type where the outlet side of the fine filter is designed to operate without overpressure, where the working fluid that flows from the fine filter in a depressurized state is pumped on by a second pump, and where the second pump is driven by the same driving device as the feed pump of the fine filter.

Abstract: A connector for a portable combination fan and mister in accordance with the present invention has a lock, a hook and a corresponding strongback. The hook is attached to the fan to hold the strongback that is attached to the mister. The connector allows the fan attached to and disconnected from the mister quickly and conveniently.

Abstract: A vacuum conduit connected to a vacuum pump has a shield surface which absorbs radiation to reduce the total radiation falling on the vacuum pump. The vacuum system includes the vacuum conduit connected between a process chamber and the vacuum pump and a surface treatment along at least a portion of the shield surface adapted to absorb radiation. Since the treatment is on the interior surface of the vacuum conduit and does not extend into the center of the conduit, gaseous flow to the pump is not impeded. In this manner radiation entering the vacuum pump and falling on the cryogenic array is reduced without impeding gaseous flow to the cryogenic surface. The system therefore minimizes the radiation load on the cryogenic array in the vacuum pump without impeding the gaseous flow through the vacuum pump.

Abstract: A miniature pump includes a miniature pump portion including a suction passage through which a liquid flows in, and a discharge passage through which the liquid flows out, and a bubble trap portion for blocking an entry of air bubbles into the miniature pump portion. Since the bubble trap portion prevents the entry of air bubbles into the miniature pump portion, a deterioration of pump characteristics owing to the entry of air bubbles can be suppressed, making it possible to obtain a miniature pump that achieves both a large discharge flow rate and stable discharge flow rate characteristics.

Abstract: A cover apparatus has a cover main body held to a compressor by using a clip to cover a terminal and electrical parts connected to the terminal, the clip having an elasticity. The cover main body has a an internal passageway or pass portion formed in an inner portion of the main body, and the clip has a press portion, an insertion portion extended from the press portion, and an engagement portion formed in the insertion portion. The insertion portion is inserted within the pass portion and the engagement portion is detachably engaged with a fence provided in the compressor in adjacent to the terminal by its elasticity, and the press portion contacts an outer surface of the cover main body.

Abstract: A reversible pivoting vane rotary compressor includes a housing having a generally cylindrical chamber defined by an inner wall. A rotor is mounted eccentrically within the chamber to define about the rotor a generally crescent shaped compression chamber, which narrows from a main chamber region to a constricted chamber region, which rotor has a circumferential surface. A pair of reversible intake and exhaust ports are connected communicably with the constricted chamber region. Each port selectively and alternately introduces air into the constricted chamber region while the other port exhausts air from the constricted region. At least one adjoining pair of curved vanes are pivotably attached to the rotor and extend in generally opposite arcuate directions from the rotor into the chamber.

Abstract: An oil pump for a scroll compressor has a bearing hub with a vent disposed between at least one fluid inlet in the bearing hub and a thrust washer. The vent provides an additional fluid flow path to equalize fluid pressure underneath the thrust washer. By minimizing or eliminating low fluid pressure zones with the bearing hub, fluid flow through the oil pump can be maintained at a constant level.