Abstract: A multi-stage compressor includes a compression module configured to compress a refrigerant therein through reciprocation of a plurality of pistons provided in a front housing, a rear housing coupled to the front housing to define an internal space between the front housing and the rear housing; a separation plate located between the front housing and the rear housing to separate the internal space between the front housing and the rear housing into a front space and a rear space; and a partition wall coupled to the rear housing to partition the rear space into an injection space before a refrigerant injected thereinto is primarily compressed, a primary discharge space from which the refrigerant is discharged in a primary compressed state by some of the pistons, and a secondary discharge space from which the primary compressed refrigerant is discharged.

Abstract: A vane pump includes a housing, a rotor, a vane and a reed valve. A position at which the sliding direction of the vane with respect to the rotor is inverted from outward to inward is defined as a reference position, and a section of the pump chamber on the discharge hole side with respect to the reference position is defined as a discharge section. A pressure relief groove is disposed in a portion of the bottom wall portion corresponding to the discharge section with a clearance secured between the peripheral wall portion and the pressure relief groove. When the vane overlaps the pressure relief groove, a pair of the working chambers communicate with each other via the pressure relief groove.

Abstract: Disclosed is a liquid-ring vacuum pump that enables a worker to inspect components provided in a main body from the outside using a see-through device without disassembling the main body and to easily remove foreign matter from the main body merely by demounting the see-through device from the main body. The liquid-ring vacuum pump includes a main body, which accommodates a shaft centrally mounted therein to receive rotational force from a driving motor and has a mounting hole formed therein so as to communicate with the interior of the main body, a rotor rotating together with the shaft inside the main body, a head unit coupled to at least one side of the main body, and a see-through device, which is detachably mounted in the mounting hole and includes a see-through window member to allow the interior of the main body to be inspected with the naked eye.

Abstract: A pump, such as a vacuum pump, includes at least one housing and a motor and oil reservoir disposed within the housing. The pump housing can include a bottom exterior surface and one or more side and/or front exterior surfaces that extend generally up from the bottom exterior surface. An oil drain port can be positioned at or near the intersection of the bottom exterior surface and the side or front exterior surface. The housing can include an interior bottom surface that defines at least a portion of a drain passageway for the pump and can be fluidicly coupled to the oil reservoir. At least a portion of the interior bottom surface can be angled downward at an acute angle to the horizontal towards the oil drain port to improve the draining and replacement of oil in the pump.

Abstract: A vane oil pump includes a rotor including a plurality of slits, a housing having an inner circumferential cam surface such that a first pump unit and a second pump unit taking in and discharging oil in accordance with rotation of the rotor are separately disposed in a rotational direction of the rotor, a plurality of vanes respectively fitted in the slits of the rotor, and a pressure adjusting device configured to adjust a second discharge pressure of the second pump unit to a lower pressure than a first discharge pressure of the first pump unit. A back pressure groove is disposed on the housing and is provided to supply back pressure oil to a bottom portion of each slit.

Abstract: An embodiment provides a vane pump device including a rotation shaft; and a pump unit that discharges oil at multiple discharge pressures, discharges oil to one side in an axial direction of the rotation shaft at a first discharge pressure of the multiple discharge pressures, and discharges oil to the other side in the axial direction at a second discharge pressure of the multiple discharge pressures.

Abstract: An embodiment provides a vane pump device includes multiple vanes; a rotor that rotates and includes vane grooves for supporting the vanes and accommodating oil; a cam ring that includes an inner circumferential cam ring surface provided with a high pressure region and a low pressure region, and that surrounds the rotor; and an inner plate that covers an opening of the cam ring. The inner plate includes a first portion that supplies high pressure oil to the vane grooves, and a second portion that supplies low pressure oil to the vane grooves. Among vane grooves which support vanes positioned in the high pressure region of the cam ring, the first portion supplies high pressure oil to vane grooves, the number of which is less than the number of vanes positioned in the high pressure region.

Abstract: An improved self-priming, centrifugal pump arrangement for mixed-media flow includes a volute housing having a suction and a discharge, a volute scroll disposed within the volute housing, an impeller disposed within the volute scroll, a suction hopper and a discharge hopper within volute housing, a back cover and a wear plate attached to the volute housing. By optimizing the geometry of these internal components, noise is reduced, efficiency of the pump is improved, and the self-priming feature is maintained.

Abstract: A rotary-vane machine, has a stationary tubular housing having a lubricated pump with an oil carter, and an oil-free section, with two pairs of ports through which a working medium enters or exits, a housing cover plate, a sun gear attached to a boss, a bearing and oil transferring member, a cover disc attachable to the end of the oil-free housing section, and a tubular rotor inside of which are fixedly attachable, two tapering vanes rotatable, together with the rotor, at a uniform speed.

Abstract: A fluid content monitor including a cuvette, a calorimeter adapted to generate a signal indicative of contents of a fluid sample contained in the cuvette, a container for holding a reagent, and a pump assembly for delivering reagent from the container to the cuvette. The pump assembly includes a tube extending from the container to the cuvette, check valves preventing reverse flow in the tube, and a hammer driven by a solenoid for repetitively compressing the tube to pump reagent to the cuvette. The cuvette can be removed for cleaning and replacement.

Abstract: A vane pump assembly including a cam ring having an elliptical inner bore defining a hydraulic pumping chamber, the pumping chamber having an interior camming surface. The cam ring defines ports for admitting fluid into the pumping chamber. A rotor, within the cam ring, defines a plurality of radial vane slots. A vane assembly is supported in each vane slot to define vane buckets. Each vane assembly has an end dynamic vane seal for reducing leakage between the buckets. Front and rear side plates, separated by an annular spacer, enclose the pumping chamber. The pump assembly may also include floating front and rear rotor seals for reducing radially inward leakage. Each rotor seal is disposed within a groove formed in the rotor, wherein discharge pressure urges the rotor seals axially outward from the pumping chamber to create an effective seal against the respective side plate.

Abstract: A self-priming centrifugal pump comprises an inlet and an outlet, and a centrifugal impeller for receiving liquid from the inlet and delivering it to the outlet. An inlet valve and an outlet valve are provided, and a diaphragm arrangement is driven by the same motor as the impeller to provide priming. The diaphragm arrangement can be integrated into a pump design without taking up significant additional space. By driving the diaphragm arrangement with the motor, no additional power source is required.

Abstract: In a rotary fluid machine including pistons (37) reciprocally received in cylinders (33) provided in a rotor (27), and vanes (44) fitted in vane grooves provided in the rotor (27) for reciprocal movement, the rotor (27) includes a rotor core (31) which is supported on a rotary shaft (21) and in which the cylinders (33) are accommodated, and twelve rotor segments (32) separated in a circumferential direction and fixed to surround an outer peripheral surface of the rotor core (31); and each of the vane grooves (43) is defined between the adjacent rotor segments (32). Thus, the dimensional accuracy of the vane grooves (43) can be enhanced without need for a special accurate working or processing.

Abstract: A compact high efficiency vane pump is disclosed having a unique T-shaped vane and rotor slot configuration with a roller tip vane in a uniquely configured chamber. To minimize friction in chamber diameter, a pressure plate is provided which is hydraulically balanced, both in the forward and reverse pump and motor modes, having micro pressure pulses which vary multiple times per rotor rotation in order to compensate for varying hydraulic axial load on the housing.

Abstract: In a variable capacity type pump, in the inner diameter of a cam ring, an inner diameter of a portion forming a middle section between a suction section and a discharge section in a pump chamber is constituted by a negative slope curve in which an end portion of a suction port is set to be a start point, and a complete round curve and a negative slope curve are connected by a high-order curve.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: The invention relates to a roller vane pump suitable for pumping transmission fluid in an automatic transmission for motor vehicles. The pump is provided with a pump housing (2), a rotatable carrier (3) being located in the interior of the pump housing (2), a cam ring (5) surrounding the carrier (3) in radial direction, and roller elements (7) being provided in slots (6) in the carrier periphery. The spaces between the pump housing (2), the carrier (3), the cam ring (5) and the roller elements (7) define a number of pump chambers (8). Furthermore, the pump is provided with feed apertures (9) for allowing a flow of fluid to a pump chamber (8) and with discharge apertures (10) for allowing a flow of fluid from a pump chamber (8). According to the invention constructional measurements are taken to avoid the occurrence of cavitation and to obtain higher pump efficiency.

Abstract: A compact high efficiency vane pump is disclosed having a unique T-shaped vane and rotor slot configuration with a roller tip vane in a uniquely configured chamber. To minimize friction in chamber diameter, a pressure plate is provided which is hydraulically balanced, both in the forward and reverse pump and motor modes, having micro pressure pulses which vary multiple times per rotor rotation in order to compensate for varying hydraulic axial load on the housing.

Abstract: A vane-cell pump, has a rotor that is arranged in a lifting ring that forms at least one suction region and one pressure region. Radial slots extend over the entire width and are arranged on the circumferential surface of the rotor. Vanes are arranged in the slots in a radially movable manner, with stationary lateral limiting surfaces (lateral surfaces) that adjoin the rotor and the lateral edges of the vanes in a sealing manner. At least one of the lateral surfaces comprises a groove that extends within the range of motion of lower vane chambers and the other lateral surface comprises at least one lower vane pocket that is assigned to the suction region and connected to the pressure region within the range of motion of the lower vane chambers.

Abstract: An aquarium pump for use both as an air pump and a water pump, includes an electromagnet, a diaphragm reciprocally driven by the electromagnet, an outer casing in which said electromagnet and said diaphragm are accommodated, an inlet and an outlet each outwardly protruding from said outer casing. The pump has an inlet passage provided in the outer casing, the inlet passage communicating the inlet and an inside of the diaphragm in a fluid-sealed manner, and an outlet passage provided in the outer casing, the outlet passage communicating the outlet and said inside of said diaphragm in a fluid-sealed manner. The inlet, the inlet passage, the inside of the diaphragm and the outlet constitute a fluid-sealed passage so that the aquarium pump functions both as an air pump and a water pump. The aquarium pump may preferably be used for an aquarium apparatus with a passage aquarium.

Abstract: The invention relates to a roller vane pump for operating an automatic transmission for motor vehicles. The pump is provided with a pump housing (12), a rotor (4), a cam ring (2) and roller elements (7), which define a number of pump chambers (13). Fluid is communicated between a hydraulic channel (24) and a pump chamber (13) through suction ports (11 and 16) and discharge ports (17 and 18). According to the invention the pump is provided with a suction port (26) for allowing a predominantly radial flow of fluid to a pump chamber (13) and/or with a rotor (4) with slots (6) with a circumference (32) which is partly curved with a curvature substantially matching the curvature of the roller elements (7) and/or with a rotor (4) with a circumference segment (30) deviating at least partly from a circle, in order to decrease the amount of wear of pump parts as well as the noise level generated during pumping.

Abstract: The invention provides a rotary-vane machine having a stationary shell including a casing member (2), a camming ring (4) having an internal, noncircular camming surface (6), and a flange member (8); a rotor (10) including at least two first vanes (12) fixedly attached to, or integral with, the rotor (10), a first cover plate (14) fixedly attachable to the rotor (10); a second cover plate (16) fixedly attachable to the rotor and integral with a first shaft (22) supported on its free end by bearing (26) mounted in the casing (2), and being provided with at least four ports (a) for access or egress of a working medium; a second shaft (23) supported by a first bearing (28) accommodated in the first cover plate (14) and by a second bearing (30) accommodated in the second cover plate (16); at least two second vanes (38) fixedly attached to the second shaft (23) and oscillatably accommodated within the rotor (10), and defining, together with the rotor (10), the first vanes (12) and the first and second cover plates

Abstract: A roller vane stage (10) for a fuel pump (80) includes an inlet plate (12), an outlet plate (14), and a spacer (16) held therebetween, the spacer having an eccentric inner surface (20) defining a rotor space (18) therein. The roller vane stage (10) further includes a rotor (30) mounted for rotation within the rotor space (18) and the rotor has a plurality of lobes (40), wherein each lobe contains an associated roller (42). Driver slots (44) located in the rotor (30) have a depth less than the thickness (h) of the rotor. Center outlet port (26) in the outlet plate (14) is shaped such that a lobe (40) and its respective roller (42) remains in fluid communication with the center outlet port almost until the lobe begins to communicate with inlet ports (22, 24) in the inlet plate (12).

Abstract: This design utilizes spherical balls that function as pumping members and also function as bearing loads. The housing includes channels that are used to convert rotary motion to true linear reciprocating motion relative to the center of operation by use of modified involute profile curves. The channels have an enlarged radius of curvature, four (4) contact point designs, and an arch design depending upon application and loads, etc. A variable vane shaft and variable seal plug have a make-before-break design that eliminates damaging high pressure spikes due to the trapped fluid. The vane is used to vary and control pumping arc by directing the high and low pressures. A rotor disclosed has an angle and slots that are designed to align with tangent of the involute curve. The variable displacement disclosed herein is varied by varying the pumping arc thereby causing more or less fluid to be pumped from inlet pressure to inlet pressure which actually affects displacement and input power required.

Abstract: A liquid-sealed vane oscillator includes a housing defining a cavity corresponding to part of a virtual annulus centered around, and extending at least 180.degree. about, an axis of rotation and delimited by first and second ends. A vane is mounted rotatably within the cavity. The vane includes a first seal and a second seal carried with the vane and deployed so as to subdivide the cavity into a first chamber of variable volume between the first end and the first seal, a second chamber of variable volume between the second end and the second seal, and an intermediate volume between the first seal and the second seal. At least one port is provided in fluid communication with each of the first and second chambers. The oscillator also has an axial shaft, penetrating and extending from the cavity, which is mechanically coupled to the vane so as to allow exchange of mechanical power with an external device.

Abstract: A variable displacement vane pump comprising a durable rotor member having journal ends at each side of a larger diameter central vane section comprising vane slots having well areas which slidably-engage a mating vane element. The present vane pump comprise novel cylindrical ring seal elements having a unitary body which seal the faces of the cam member, and which overlap the central vane section and vane slot extensions. The seal elements include first fuel inlet passages in the inlet arc segment thereof, and fuel discharge passages in the discharge arc thereof, both of said passages being open to the vane slot extensions and to the cam chamber for the continuous supply and pressure discharge of fuel.

Abstract: A variable displacement vane pump comprising a durable rotor member having journal ends at each side of a larger diameter central vane section comprising vane slots having well areas which slidably-engage a mating vane element. The present vane pump comprises an outer cylindrical cam enclosure or spacer loaded against ring seal elements to support the faces of the seal elements closely spaced from the cam faces and reduce the actuation force required for adjustment of the displacement capacity of the pump. The cam faces include a biased segment seal in the high pressure discharge arc area. The seal elements include first fuel inlet passages in the inlet arc segment thereof, and fuel discharge passages in the discharge arc segment thereof, both of said passages being open to the vane slot extensions and to the cam chamber for the continuous supply and pressure discharge of fuel.

Abstract: A durable, single action, variable displacement vane pump capable of undervane pumping, components thereof, and pressure balancing method. The pump comprises a cylindrical barstock rotor member having large diameter journal ends and central vane slots uniformly spaced therearound. The vane slots are elongate and have a central vane-supporting portion of maximum depth surrounded at each end by extension portions having depths which decrease axially to the surface of rotor member. The vaned rotor is rotatably supported within a unitary cam member having opposed faces and a circular bore therethrough forming a cam chamber having a continuous interior circular cam surface. The vane slot extensions in the rotor project outwardly beyond the cam chamber.

Abstract: A pressure washer is provided with a flow control switch and a bypass passage. The flow control switch shuts the motor of the pressure washer off when fluid is not being supplied to the pressure washer or when the spray gun of the pressure washer is closed. The bypass passage relieves excess outlet pressure and activates the flow control switch when the spray gun is closed. The pressure washer may include a soap pump for injecting soap into low pressure fluid at the inlet of the pressure washer.

Abstract: A lubricating device for a horizontal type rotary compressor having an oil pumping chamber formed under the vane in the compression cylinder. The oil pumping chamber is provided in the compression cylinder under the vane and has an oil inlet port and an oil outlet port provided on at least one of its side walls. An oil piston is received in the pumping chamber such that it elastically vertically reciprocates in the pumping chamber in accordance with vertical reciprocation of the vane. The piston is biased upwards at the outside of the pumping chamber by a steel wire spring which is connected at one end thereof to the oil piston and at the other end thereof to one of the compression cylinder, the main bearing and the sub bearing. An oil feed pipe is connected between the oil outlet port of the pumping chamber and an oil conduit of the eccentric rotating shaft. A hydraulic diode, of which the upper diameter is not smaller than the lower diameter, may be axially formed in the oil piston.

Abstract: A fluid device (pump or motor) comprises a case having a closed chamber, a rotating element mounted for rotation within the closed chamber, a reciprocating piston drivingly connected to the rotating element such that rotation of the rotating element corresponds to reciprocating movement of the piston, passages for admitting and discharging fluid to and from a cylinder in which the piston reciprocates, and scavenger pump means drivingly connected to the rotating element and operable to pump fluid out of the closed chamber at a rate greater than the rate at which fluid leaks or otherwise is metered into the interior chamber, thereby to maintain the level of fluid within the closed chamber below a predetermined level.

Abstract: A vane pump has a plurality of outwardly spring loaded vanes mounted within slots respectively formed in a rotor. The internal surface of the stator of the pump is of cylindrical form, and end plates at the opposite ends of the rotor and stator have inlet and outlet ports formed therein. Each vane is provided with a transfer port which communicates with the inner end of the associated slot and the transfer port is positioned to register with the inlet and outlet ports so that the movement of the vanes within the slots contributes to the pumping action.

Abstract: The power and compressor units of an internal combustion rotary engine system utilize a rotor assembly, concentrically mounted on a stationary distributor core member, for rotation about an axis eccentric to the central axis of a cylindrical cavity that provides the working chamber of the unit. Three vanes are disposed in the body of the rotor assembly for slidable movement in a radial direction, which engage the cylindrical surface disposed eccentrically thereabout so as to define chambers of dynamically increasing and decreasing volume as the rotor assembly operates. The core member functions as a valve, permitting or preventing the flow of air into the compartments defined by the vanes in a sequence that is timed to establish air introduction, compression, combustion (in the power unit) and exhaust phases of the operating cycle. In certain embodiments, the surface that cooperates with the vanes may be provided by a shell that is also mounted for rotation within the engine block.

Abstract: A rotary vane pump has a hollow rotor and a stationary liquid distributor member within the hollow rotor center, within which member plural supply and discharge fluid paths are provided. An elliptical housing allows for any one pumping chamber defined between adjacent slidable vanes to undergo plural pumping cycles. The novel pump is suited to operate under conditions of low inlet pressure and high discharge pressure, and is usable with incompressible liquids. The elliptical housing is formed by a boundary ring located within a pump casing, the boundary ring having an elliptical inner surface and a cylindrical outer surface. The pump may selectively include structure for enabling separation of particulate material from pumped liquids by the use of centrifugal force. The particulate material enters an opening in the boundary ring, the opening being connected by a passageway in the pump casing to a removable particulate collection chamber connected to the pump casing.

Abstract: A hydraulic/pneumatic pump for an aquarium includes a motor having an upper output shaft enclosed by an upper casing and a lower output shaft enclosed by a lower casing, a hydraulic pump assembly driven by the lower output shaft, and a pneumatic pump assembly driven by the upper output shaft. The hydraulic pump assembly pumps water from the aquarium to be filtered via an inlet pipe thereof and outputs water to a filter unit via an outlet pipe thereof. The pneumatic pump assembly includes a ring mounted on the upper output shaft, an impinging member securely mounted on an upper surface of the ring, an actuating pin, a return spring, an air bag, a lower chamber, an upper chamber, and a variable chamber defined by the air bag. Air is sucked into the variable chamber via an inlet opening in the body and the lower chamber when the impinging member disengages with the actuating pin to release the air bag by the return spring.

Abstract: The preparation of abrasives, especially abrasive papers and abrasive fabrics, is improved by using an epoxy resin in conjunction with a cationic photoinitiator as binder for the abrasive particles. The binder is cured by irradiation with shortwave light and subsequent heating. The process is distinguished by low curing temperatures and brief curing times.

Abstract: A fuel injection pump includes a pumping section that is segregated from the drive mechanism to permit independent lubrication of the latter, thereby avoiding any need for reliance upon the fuel supplied for that purpose. Generally, the unit will have two pumping stages, one utilizing a rotating vane arrangement and the second comprising reciprocating pistons, and it may include novel means for adjusting timing and speed, which means may automatically be controlled in response to fuel pressure.

Abstract: A vane type pump suitable for a hydraulic system comprises passages communicating with the underside of the vanes in the inlet quadrant with the surrounding of the drive shaft and passages communicating the underside of the vanes in the discharge quadrant with the discharge chamber, thereby the underside of the vanes can act as a set of additional little pumps while being ineffective at zero pressure. The undervane pressure in the inlet quadrant can be tested and adjusted at any time during the operation by a manometer and an auxiliary valve. The vane type pump in accordance with the present invention is adapted to various viscosities of fluid such as 1-38 cst, 50.degree. C., and it is possible to work at negative pressure without keeping the reservoir a certain relative height and without replacing the inner component. The pump works at a high volumetric efficiency and total efficiency all the time.

Abstract: The invention relates to a vane pump having input and output slot means. Either the input slot means or the output slot means are designed such that for a movement of the cam ring into a position of zero excentricity the area of overlap between the input slot means and the output slot means is increased.

Abstract: A power steering device including a vane type oil pump having vanes which are radially movable in slits of a rotor to supply hydraulic fluid from an oil reservoir tank to a power cylinder through a flow passage switching valve. Chambers are defined behind the valves at base ends of the slits. Hydraulic fluid having a pressure built up by the reciprocal motion of the valves in the chambers is supplied through a solenoid coil type flow control valve to hydraulic reaction force chambers of a power cylinder control valve to thereby control a force applied between input and output shafts thereof, thereby to determine the steering force required.

Abstract: A reversible flow vane pump having a pump case with a pump chamber in which a rotor is mounted. The rotor has outwardly-opening slots which carry vanes which engage a cam ring and with fluid chambers between vanes. The cam ring can be adjusted to positions at either side of a neutral position to provide reversible flow operation between a pair of ports, with variable volume control. The ports are arranged to increase the length of time in which a port communicates with an intervane fluid chamber which is of decreasing volume for increased utilization of fluid being pressurized. A port which functions as an inlet port in a predominant mode of operation of the pump has an extension effective to increase the length of time in which an intervane fluid chamber of increasing volume can be filled with fluid.

Abstract: A two-stage rotary compressor makes use of a piston-vane arrangement where both stages are built end to end and where the same members (piston-vanes) work for both stages, the "axial pistons" of the second stage becoming the dividing "vanes" in the first stage.

Abstract: A vane pump (2), with undervane pumping capability, has a housing (4,14) within which a cam ring (16) is mounted. The cam ring has a cam surface which defines a pumping cavity and which includes two diametrically opposed inlet arcs (48, 50), two diametrically opposed discharge arcs (38, 40) and seal arcs (56, 58, 60, 62) disposed between the inlet arcs and discharge arcs. A rotor (12), mounted for rotation within the housing, carries a plurality of spokes (22). Mounted upon the spokes for radially outward and inward movement are channel-shaped vanes (28) having arcuate tips (46) for engaging the cam surface. Variable volume chambers (94), which provide undervane pumping, are formed between the radially outer ends of the spokes and the vanes. The variable volume chambers communicate with intervane volumes (93) through grooves (86) on the spokes. The vane tips engage seal arcs along a line of contact (76) selected to insure that the vanes are pressure balanced.

Abstract: A rotary hydraulic vane pump is disclosed of the type including a cam ring (19) defining an internal cam surface (21). The pump also includes a rotor (25) which defines a plurality of slots (27) which receive roller vanes (29). The internal cam surface includes a discharge arc surface portion (65) which is the cam fall portion of the cam surface. In one aspect of the invention, it is recognized that flow turbulence, pressure pulses and noise is caused by a slight net increase in the volume of a contracting fluid chamber (57) during cam fall, and that this increase is caused by radially inward movement of the roller vane during cam fall. In another aspect of the invention, the discharge port (59) is located such that fluid communication between the contracting fluid chamber and the discharge port does not occur until after the net increase in the volume of the contracting fluid chamber has ceased, and a net decrease in the volume of the chamber has begun.

Abstract: A rotary vane pump having a rotatable rotor in an elliptical chamber and a plurality of radially slidable vanes dispersed around the rotor, and having an intake phase and a discharge phase of rotor rotation, wherein liquid is admitted into the pump, pressurized and expelled from the pump at an elevated pressure. The improvement including passages in flow communication with the pressurized side of the pump vanes, and an auxiliary outlet communicating with the passages to provide an auxiliary pressurized liquid outlet from the pump, wherein the auxiliary pressure is developed by the pump vanes.

Abstract: A two-stage rotary compressor makes use of a piston-vane arrangement where both stages are built side-by-side and where the same members (piston-vanes) work for both stages, the "axial pistons" of the second stage becoming the dividing "vanes" in the first stage.

Abstract: An improved work machine of the eccentric piston type which may be employed to translate force of pressurized fluid into rotary shaft motion in an external combustion type engine system, as a pump for pumping fluids in a fluid handling system, and as a fluid actuated motor. The work machine comprises a housing having an internal compartment with a peripheral lobe. An inner body is mounted for non-rotational orbital movement in the housing. The inner body housing, and a movable wall member located in a peripheral recess of the inner body form variable-volume fluid intake and discharge chambers in the housing compartment during orbital movement of the inner body. Pressurized fluid supplied to the fluid intake chamber of the housing imparts non-rotational orbital movement of the inner body in the housing and corresponding rotational motion to an output shaft on which the inner body is eccentrically mounted.