Abstract: A screw expander includes a main body, at least an expansion screw and an adjusting component. The main body has a high pressure region, an expansion region and a low pressure region. The expansion screw is disposed at the expansion region and has an air inlet end and an air outlet end, wherein the air inlet end is connected to the high pressure region, and the air outlet end is connected to the low pressure region. The adjusting component covers the expansion screw, and is adapted to move relatively to the expansion screw to change an opening area of the air inlet end or an opening area of the air outlet end, such that a pressure of an air exhausted from the air outlet end is adjusted.

Abstract: A compressor and method for controlling the volume ratio of a compressor is provided. The compressor includes a an intake passage, a discharge passage and a compression mechanism, the compression mechanism being positioned to receive vapor from the intake passage and provide compressed vapor to the discharge passage. At least one opening is positioned in the compression mechanism to bypass a portion of the vapor in the compression mechanism to the discharge passage, the at least one opening being sized and positioned to automatically vary a volume ratio in the compressor in response to a varying pressure differential between the intake passage and the discharge passage.

Abstract: Rotary expansible chamber (REC) devices having one or more working-fluid ports that are adjustable, for example, in size or location. In some embodiments, the variable port mechanisms can be used to control any one or more of a plurality of operating parameters of a REC device independently of one or more others of the operating parameters. In some embodiments, the REC devices can have a plurality of fluid volumes that change in size during rotation of the REC device, and that transition to a zero volume condition during the rotation of the REC device. Systems are also provided that can include one or more REC devices. Methods for controlling various aspects of REC devices, including methods of controlling one or more operating parameters, are also provided.

Abstract: A screw machine having a rotor housing portion and an outflow housing portion, screw rotors mounted in the rotor housing portion that form a rotor pair, and a control slide that is likewise mounted in the rotor housing portion, which delimits a working space of the rotor housing portion and which can be shifted parallel to the rotor axes of the screw rotors to change a size of the effective working space. The control slide, when shifted out of the rotor housing portion into the outflow housing portion, is guided by a positively joined guide of the outflow housing portion.

Abstract: A screw compressor includes a casing having low and high pressure spaces, a screw rotor inserted in a cylinder part of the casing, and a slide valve disclosed in the cylinder part. The screw rotor has a plurality of helical grooves forming a compression chamber. The slide valve is moveable along an axis of the screw rotor and faces an outer periphery of the screw rotor to form a discharge port to communicating the compression chamber with the high pressure space. Fluid in the low pressure space is sucked into the compression chamber, compressed, and then discharged to the high-pressure space when the screw rotor rotates. The slide valve includes a sealing projection located on a back surface of the slide valve opposite to the screw rotor, and separating the low and high pressure spaces from each other when the sealing projection is in slidable contact with the casing.

Abstract: Rotary expansible chamber (REC) devices having one or more working-fluid ports that are adjustable, for example, in size or location. In some embodiments, the variable port mechanisms can be used to control any one or more of a plurality of operating parameters of a REC device independently of one or more others of the operating parameters. In some embodiments, the REC devices can have a plurality of fluid volumes that change in size during rotation of the REC device, and that transition to a zero volume condition during the rotation of the REC device. Systems are also provided that can include one or more REC devices. Methods for controlling various aspects of REC devices, including methods of controlling one or more operating parameters, are also provided.

Abstract: A surgical instrument is provided for cutting bone and other tissue. The surgical instrument is powered by a pressurized fluid and includes a rotatable shaft connected to a dissection tool. The instrument includes a housing member comprising a one-piece base. A rotor housing chamber is defined by the base, and the rotatable shaft is located in the rotor housing chamber. A first bearing housing is defined by the base, located adjacent the rotor housing chamber, and houses a first bearing that engages the rotatable shaft. A second bearing housing is defined by the base, located on an opposite side of the rotor housing chamber from the first bearing housing, and houses a second bearing that engages the rotatable shaft. A passage is defined by the base and operable to direct a pressurized fluid through the base to the rotor housing chamber in order to rotate the rotatable shaft.

Abstract: An example revolving vane expander includes a cylinder. A rotor is housed within the cylinder to establish a working chamber between the cylinder and the rotor. The rotor is eccentrically mounted relative to the cylinder. A vane is secured to the cylinder or the rotor. The vane is slidably receivable within a slot established in the other of the cylinder or the rotor. The vane is configured to link rotational movement of the cylinder and the rotor.

Abstract: A compressor apparatus (20) has a housing (22) having first (53) and second (58) ports along a flowpath. One or more working elements (26; 28) cooperate with the housing (22) to define a compression path between suction (60) and discharge (62) locations along the flowpath. A check valve (70; 170; 270) has a valve element (72; 172; 272) mounted for movement between a first condition permitting downstream flow along the flowpath and a second condition blocking a reverse flow. The valve element includes a resonator (112; 174; 274).

Abstract: A pump having a housing with an actuator member positioned inside for controlling the flow generated by the pump. A first decrease port is connected to the housing and has a surface area in operable contact with the actuator member. A second decrease port is connected to the housing and has a surface area that is operable contact with the actuator member. A valve is connected to the second decrease port for controlling the flow of fluid to the second decrease port. A suction passage is connected to the housing and drawings fluid to the housing using the actuator member. A discharge passage is connected to the housing so that fluid providing an exit for fluid that has been pressurized by the actuator member.

Abstract: A positive displacement supercharger includes a housing defining a rotor cavity with a pair of positive displacement rotors operative to carry air axially from an inlet end to an outlet in the cavity wall near an outlet end of the cavity. The outlet communicates with an outlet plenum partially defined by the cavity wall. The cavity wall includes a stiff portion defining a plurality of lightening recesses, such as a waffle pattern, limiting distortion of the wall by pulsations in the plenum. The recesses may be time and cost efficiently converted to Helmholtz tuners by covering the recesses with a cover plate, which may be perforated to include at least one tuning opening (perforation) into each tuning chamber (recess) and forming tuning volumes of the tuning chambers and their associated tuning openings effective to attenuate selected frequencies of pulsations in the plenum and thereby reduce undesired noise emanating from the air system of the supercharger.

Abstract: A surgical pneumatic motor is designed to be used with or without an MRI machine without affecting or influencing the magnetic characteristic of the MRI machine. The motor includes an improved vane motor with undercuts in the spindle to increase the power faces of the vanes and spindle itself, the holes in the cylinder are modified to increase the sealing area between the spindle. The inlet cylindrical holes and the cylinder holes and grooves are arranged to enhance the life . Wear of the edge of the vanes is decreased by the judicious location of the discharge holes. The bearings are cooled by bypassing a portion of cylinder air before re-entering the air. The noise is attenuated by a cris-cross plug in the hose the temperature of the handle is reduced by a serrated sleeve. Slipping discs in the seal serves to enhance seal life.

Abstract: A vane pump including a movable sleeve disposed between the casing and the rotor vanes in which axial and angular movement of the sleeve enables control of the fluid flow.

Abstract: Rotational pump with variable volume flow, comprising a pump housing having a suction connection and a pressure connection, an outer rotor with inner toothing which is rotatably disposed inside the housing, and an inner rotor with outer toothing which is eccentrically disposed in the outer rotor, and which can be driven by a drive shaft which is disposed in the pump housing parallel to the axis of the outer rotor, wherein a rotatable adjusting ring is provided coaxially to the drive shaft to change the volume flow in the pump housing, and in which the outer rotor is eccentrically and rotatably disposed, characterized in that a slider, which can change the size of at least one of the connections, is disposed, as viewed in the turning direction, between the pressure connection and the suction connection.

Abstract: A vane motor is modified to increase the sealing effectiveness of the gap made at the interface of the spindle and cylinder by undercutting the cylinder a predetermined amount and distance so as to increase the effectiveness of the spindle to cylinder gap and to decrease the requirements for lubrication of the vane motor.

Abstract: A three-stage internal combustion rotary engine, comprised of: a compressor feeding compressed air to a combustor for compression, fuel injection, combustion, and expansion of gases which rotate the rotor. The combustor rotor generates torque and drives the compressor and afterburner rotors simultaneously. The afterburner receives the combusted gases and scavenged air from the combustor for secondary combustion and expels the exhaust gases. Each unit consists of a housing joined together on a common axis and a rotor with a shaft mounted in an eccentric position of the housing side-walls. The shafts are interconnected by splines. The rotors have radial blind slots which contain slidable, movable vanes fitted with half-round knobs on opposite sides, aligned with the top surface and fit in the hemispherical grooves on the interior side-walls of the housing. This maintains a permanent contact with the interior housing periphery, regardless of gas pressures and rotating speed.

Abstract: A variable capacity rotary compressor including a hermetic casing, and a housing installed in the hermetic casing to define therein first and second compression chambers having different capacities. A compressor is placed in the first and second compression chambers and operated to execute a compression operation in either the first or second compression chamber according to a rotating direction of a rotating shaft which drives the compressing unit. A pressure controller applies the outlet pressure of the compressor to the first or second compression chamber where an idle operation is executed, and has a path control chamber provided at a portion of the housing outside the first and second compression chambers. First and second inlet channels connect both ends of the path control chamber to inlet ports of the first and second compression chambers, respectively. A communicating channel connects an outlet side of the compressor to the path control chamber.

Abstract: A rotary piston pump comprising a rotor mounted within a housing, the rotor having a pair of slidably mounted vanes on opposite surfaces. The inner wall of the housing acts as a cam surface to move the vanes inwardly, and centrifugal force or a combination of centrifugal force and biasing causes the vanes to move outwardly. The rotor is eccentrically mounted within the housing and the housing interior walls are of irregular configuration, whereby fluid from an inlet is moved by the vanes through the housing to an outlet. This rotary piston pump is of economic construction, serves a variety of applications and is easy to service.

Abstract: A positive displacement pump comprising a casing having an interior chamber and an inlet and an outlet oppositely spaced within the chamber. A rotor with a cylindrical outer surface is secured in offset position within the chamber. An end disk is secured to each end of the rotor. Three planar vanes are provided, each having sides and inner and outer edges. The sides of the vanes are seated within the end disk slots. The outer edges of the vanes are in constant contact with the side wall of the chamber. The inner edges of the vanes are constantly movably seated in the rotor slots during operation of the pump. The slots in the rotor within which the vanes are seated are formed along a chord when the rotor is viewed in lateral cross section and are orientated so that their planes lie at 60° angles to the planes of adjacent slots.

Abstract: An engine includes a compressor, and combustor, and an expander. The compressor compresses ambient air. The combustor burns the compressed air, and produces exhaust gasses. The expander receives the exhaust gases from the combustor, and expands the exhaust gasses. The compressor may be a gerotor compressor or a piston compressor having variable-dead-volume control. The expander may be a gerotor expander or a piston expander having variable-dead-volume control. Moreover, the engine may include a regenerative brake. The regenerative brake may include one or more valves coupled to the compressor, an expander clutch, and a compressor clutch. Specifically, during braking, the expander clutch is disengaged and the compressor clutch is engaged.

Abstract: A rotary vane combustion engine is provided that has a plurality of vane cells. This rotary vane combustion engine includes a rotor having a plurality of vanes; a stator enclosing the rotor to form a plurality of vane cells between the plurality of vanes; one or more intake ports for providing intake charge to the vane cells; one or more exhaust ports for removing exhaust gas from one of the vane cells; and a variable bandwidth fuel-air source connected to at least one of the intake ports for providing a discrete band of mixed fuel and air having a desired axial width to each of the plurality of vane cells. By providing a discrete band of fuel and air to each of the vane cells, this rotary vane combustion engine will allow the machine or engine to run at lower power without requiring it to run a vacuum to lower the density of mixed fuel and air. As a result, vacuum pumping losses can be substantially eliminated and the machine or engine can operate more efficiently.

Abstract: In-line engine with variable compression, comprising a cylinder receiving section which is tiltably mounted in the crankcase section (4) of the engine, in which the crankshaft is mounted by means of crankshaft bearings (90) arranged in the lower region of the crankcase section (4). The crankshaft bearings incorporate bearing caps (102) which constitute continuous stiffening transverse connecting elements between the lower lateral parts (104,106) of the crankcase section. These transversely connecting bearing caps rest at their outer end (108,110) against internal surface areas in the lower lateral parts (104,106) of the crankcase section on both sides of the engine. The bearing caps are securing in the crankcase section (4) not only by means of vertical crankshaft bearing screws (112,114) but also by means of screwed joints (166, 118, 120) which connect the lower lateral parts to the outer ends (108, 110) of the bearing caps.

Abstract: A sliding vane machine with a cylindrical rotor (11) eccentrically placed in a housing, the rotor being rotatably mounted in the housing with its periphery in contact with the interior of the housing at one point and being provided with a number of vanes (13). The vanes are guided in grooves (12) in the rotor (11) for essentially radial movement and delimit, together with the rotor (11) and the housing (1), chambers (14) for transporting a medium from an inlet opening (15) to a delivery opening (16). The movement of each of the vanes (13) is guided by at least one guide (17, 18), which runs along a guide race (19) in the housing. The guide race (19) and/or the interior of the housing (1) has such a shape, that the radially distal end of each vane (13) follows the contour of the interior of the housing (1).

Abstract: A non-contact rotary vane gas expanding apparatus functions to convert controlled expansion of gas under pressure to rotary motive power.

Abstract: A rotary internal combustion engine including a plurality of variable compression ratio rotating combustion chambers or alternatively stationary combustion chambers, a multi-piston movable assembly or alternatively a multi-sector movable assembly, a multi-sector stationary assembly or alternatively multi-piston stationary assembly with means for effecting ignition or alternatively for injecting fuel into the combustion chambers. The combustion chambers are formed by the multi-sector stationary assembly and the multi-piston movable assembly such that each of the pistons is located radially of the engine's pre-definable center axis. The stationary assembly, the movable assembly and the pistons of the movable assembly are cooperatively associated one with another so that the movable assembly is capable of being made to undergo rotating motion about the engine's center axis in a circular path about the stationary assembly.

Abstract: A thermal engine utilizing a positive displacement rotary expander and preferably a positive displacement rotary compressor in conjunction with an external substantially steady-state thermal source, such as a continuous fuel combustor, the external source heating a high pressure gas that is directed from the thermal source to the rotary expander wherein the gases expand driving a rotor in the positive displacement rotary engine before discharge. An additional embodiment of the thermal engine includes a modified epitrochoidal chamber configuration for the compression cycle and the expansion cycle to utilize the total internal volume for each compression pulse and expansion pulse for obtaining improved thermal efficiency in a manner similar to super long stroke reciprocal piston engines.

Abstract: A rotary air compressor with a housing forming an epitrochoidal chamber in which a multilobed rotor with a ring gear eccentrically rotates on an internal central gear in the housing, the rotor dividing the chamber into multiple subchambers of changing volume as the rotor rotates, the chamber having intake ports of variable size opening to change the quantity of gas that is compressible and outlet ports having spring biased plunger valves to prevent flow of discharged compressed air back into the compressor.

Abstract: A rotary engine having an epitrochoidal engine component and a supercharger component connected to the engine component by a variable transmission, the engine component having valve plugs for varying the effective displacement of air compression according to engine load and speed, the engine component having a regional combustion chamber design and fuel injection system designed to improve the timing and completeness of combustion.

Abstract: A thermal engine utilizing a positive displacement rotary expander and preferably a positive displacement rotary compressor in conjunction with an external substantially steady-state thermal source, such as a continuous fuel combustor, the external source heating a high pressure gas that is directed from the thermal source to the rotary expander wherein the gases expand driving a rotor in the positive displacement rotary engine before discharge.

Abstract: A hydraulic device has an inner rotor of cylindrical section mounted eccentrically within an outer rotor of tubular section. Angularly spaced axially extending ribs of part-circular cross-section are provided on the inner rotor and correspondingly spaced axial recesses of part-circular cross-section are provided on the opposed surface of the outer rotor, the ribs meshing with the recesses over an arcuate working zone in which a plurality of adjacent ribs engage corresponding recesses, the ribs moving relative to but in engagement with the recesses as they progress through the working zone. A baffle is located between the rotors to provide a seal therebetween outside the working zone and an inlet port is provided to the working zone adjacent the termination thereof relative to the direction of rotation of the rotors while an outlet port is provided adjacent the center of the working zone, the inlet and outlet ports being separated by at least the pitch of the ribs on the rotor.

Abstract: The invention relates to a rotary displacement compressor having volume ratio regulation. A connection channel (8,9,10) connects the working space of the compressor to the pressure channel (5). In the channel (8,9,10) there is provided means (13) for sensing the direction of flow through the channel. The direction of flow is an indication of whether there is over or under compression. Signals from the flow direction sensing means (13) affect the position of a movable edge (29) of the outlet port (32) so that this edge (29) will move to a position where the internal compression complies with the outlet pressure. By using the direction of flow as the governing parameter for the volume ratio regulation instead of the pressure difference or the power consumption of the prime mover according to known technique, a more accurate adaption of the volume ratio to the outlet pressure is achieved.

Abstract: A rotary compressor of variable displacement type comprises a cylinder, a rotor accommodated in the cylinder in an eccentric relationship therewith, at least one vane incorporated in the rotor through an outer periphery of the latter and movable relative to the rotor reciprocatively in a longitudinal direction of the vane, and two side plates closing the cylinder at both axial ends of the latter. A suction port is formed in at least one of the side plates, while an opening portion is formed in a rear side portion of the vane as viewed in a direction of rotation of the rotor and being opened at a surface of the vane making sliding contact with the rotor. This opening portion is repeatedly communicated with and interrupted from a working space in the compressor according to the reciprocative movement of the vane relative to the rotor.

Abstract: A method and apparatus for metering and pumping multicomponents of high and low viscosity materials and subsequently mixing and applying the mixture includes gear pumps for pumping each component. Each gear pump has gears operating in a gear housing for receiving and pumping one of the components. The gear pumps are simultaneously driven at a predetermined speed and each gear pump is designed to pump a predetermined amount of its respective components, at the predetermined speed. Flexible hoses connect the pumps to an applicator. Check valves are used to maintain the pressure in these hoses when the pumps are in their at-rest position. The gear pumps may be driven at the same rotational speed but are designed to pump a predetermined amount of the different materials so that the ratio of materials can be precisely set.

Abstract: A large slide valve member concentrically mounts a small slide valve member or slide stop at one end thereof proximate to a helical screw rotary compressor discharge port with the small and large slide valve members movable as a unit for varying the built in volume ratio of the compressor. The small slide valve member is shiftable independently of the large slide valve member to vary the capacity of the machine. A large diameter cylinder fixedly mounted to the end of the compressor casing remote from an outlet port slidably mounts interiorly a smaller diameter cylinder fixed to the large slide valve via a spindle. The small slide valve is fixed to one end of a piston rod which extends through a bore within the large slide valve member and the spindle and terminates internally of the small diameter sliding inner cylinder and has fixed thereto a piston.

Abstract: When regulating the capacity of a rotary screw compressor in a refrigeration and heating pump system and when varying the built-in volume therein, lift valves are used which operate instantaneously and are either open or closed. In order to ensure sufficient pressure on the lift valves to effect closing, the wall of the lift valves is shaped with two different diameters and a sharply defined step therebetween. Upon closing, the sharply defined step is influenced by a pressure which is lower than the pressure influencing the end surfaces of the lift valve.

Abstract: An internal axis single-rotation machine, wherein an external rotor and an internal rotor are mounted for intermeshing rotation about their own centers of gravity at different angular velocities within a casing and wherein two pairs of radially external sealing corner areas on the internal rotor kinematically describe internal lateral faces which define recesses in the external rotor and wherein internal sealing corner areas on the external rotor kinematically describe external peripheral faces on the internal rotor, the rotors being arranged in cooperating rotative relationship such that a meshing gear-like contact is maintained between internal lateral faces of the external rotor and lateral faces of the internal rotor.

Abstract: A hydraulically driven bicycle frame with two axle members coupled to the bicycle frame and front and rear wheels mounted on such axles for rotation about the axis of the respective axle and a pair of pedals mounted on a pedal drive shaft coupled to the bicycle frame for rotation for applying manual power for operating the hydraulic system of the bicycle. The hydraulically driven bicycle has a hydraulic pump mechanism and a hydraulic drive mechanism. The hydraulic pump mechanism is operated by rotational movement of the pedal drive shaft. The hydraulic pump mechanism includes a pump housing having two sectional pump housing members that form a pump chamber between them. The two sectional pump housing members are capable of relative movement with respect to each other so that the pump chamber is capable of being varied in size for varying the flow of fluid through the pump mechanism.

Abstract: Rotary machines of the type having a fluid chamber of changing volume, e.g. as ion an engine or pump, in which two rotors rotate in the same direction; a cylindrical surface of the first rotor of substantial arcuate extent, of radius substantially equal to the radius of its bore is arranged for sealing relationship throughout a chamber-defining range of rotation, with both its bore wall and with a surface of the second rotor; and the surface of the second rotor has a progressively changing radius to cause the chamber volume to progressively change during rotation. For forming multiple chambers, each subject to successive compression and expansion, each of the rotors has a transition surface preceding its large cylindrical surface and a transition surface following its large cylindrical surface, with an apex seal formed at each end of each large cylindrical surface.

Abstract: The invention relates to a device for controlling a screw compressor, in which a rotor housing (10) includes a compression space (15) with two intermeshing rotors. In parallel with the rotors, at their discharge side two axially movable sliding valves (20, 21) are located, viz. one inner (20) and one outer sliding valve (21). The inner sliding valve (20) is movable in the outer sliding valve (21). One of the sliding valves is arranged for controlling the internal compression in the compression space (15), while the second sliding valve is arranged for controlling the capacity of the compressor.

Abstract: The reversing of the direction of rotation of the motor of a fixed vane rotary compressor reverses the direction of rotation of the rolling piston. The rolling piston through viscous friction or frictional torque frictionally engages a reversing disk and causes the reversing disk to move between two positions depending upon the direction of rotation of the rolling piston. The reversing disk has a slot therein which forms the suction inlet and is moved by rotation of the reversing disk so as to be in fluid communication with the plenum which is serving as the suction plenum at that time.

Abstract: In a screw volumetric machine, a slide is slidable in a groove along a bore accommodating the screw. This slide is movable to vary the delivery and/or compression ratio. One end of the groove communicates with the low pressure. The other end of the groove communicates with the high pressure. A separation wall separates the two pressures behind the slide. The slide is leak-tightly urged against a free end of the separation wall by holding means which slidingly retain the slide in the groove.

Abstract: A fluid pressure responsive member is shifted in accordance with the pressure differential between two lines either one of which can be a suction line with the other line being a discharge line of a reversible compressor. The fluid pressure responsive member has an arcuate recess formed therein which serves as a secondary suction port which provides fluid communication to the offset cylindrical chamber from the suction line in accordance with the position of the fluid pressure responsive member. Because the porting is responsive to the pressure differential between the two lines, the changeover of the porting is automatic upon the reversal of the operation of the compressor.

Abstract: In a method of regulating the delivery of the combustion fluid (i.e. air or mixture of air and fuel) to an internal combustion engine (1), the combustion fluid is conducted through a gas engine or positive displacement device capable of operating as a fluid motor or a fluid compressor (2) which is drivingly coupled with the internal combustion engine, and the flow rate through the device (2) is varied in the sense of the desired load change by means of a control device (3, 23) on the device. The positive displacement device (2) may be operated as a fluid motor and/or as a supercharger. As a fluid motor the work done by the expansion of the combustion gas is used to assist the engine (1), whereas the engine (1) drives the gas engine (2) when operating as a supercharger. In a preferred embodiment the device (2) is of the rotary vane type (FIG.

Abstract: A variable flow reversible vane pump having a rotor with slidable vanes, a shaft providing rotary power take off for the rotor and a cam ring wherein said rotor rotates with the vanes engaging the inside of the cam ring. A case encases the cam ring and a front bearing plate connects to the front of the case. A rotary valve surrounds the shaft and flushes against the cam ring and the rotor with slidable vanes and has a structure defining a plurality of directly opposed channeled arcuate grooves, at least one port in each of the opposed grooves, and a plurality of gear teeth along part of the periphery. A rear bearing plate encloses the other end of the cam ring and the rotor and has a structure with rear plate apertures in communication with one of the opposed arcuate grooves and the port therein of the rotary valve plate. A rotatable gear is lodged within a gear channel of the case and meshes with the gear teeth along the periphery of the rotary valve plate.

Abstract: A pump of vane type which sucks in and discharges fluid includes a pump body which is provided with at least two sets of intake ports and discharge ports, which communicate with a low pressure chamber and a high pressure chamber, respectively. An intake port and a discharge port of each set is spaced apart in substantial coincidence with a spacing between a pair of adjacent vanes, and an intake port (or a discharge port) of a second set is located between an intake port and a discharge port of a first set. Means is provided which controls the communication between selected intake ports and the low pressure chamber and between selected discharge ports and the high pressure chamber.

Abstract: A process to supercharge and control a compressor comprising a single screw co-operating with at least two pinions in order to constitute as many partial compressors as there are pinions, such partial compressors operating in parallel and one of them at least being provided with a delivery control device, wherein the supercharging flow is injected into only one of the partial compressors and the delivery of the compressor is controlled from maximal delivery by reducing at first the deliveries of those partial compressors into which the supercharging flow is not injected.

Abstract: A rotary compressor for use in air conditioning or the like including a housing having a chamber with a cylindrical rotor journaled therein, the rotor having a set of vanes radially slidable to define enclosed compartments between them. The curved outer wall of chamber has a reference region separating the chamber into inlet and outlet sides having inlet and outlet ports in straddling relation. The rotor has its axis laterally offset from the chamber axis to produce sealing at the reference region. The curved wall of the chamber on the inlet side is of substantially elliptical profile with the major axis of the ellipse generally centered on the inlet side and with the inlet port extending to a point of cut-off short of the major axis. The curved wall on the outlet side is smoothly continuous and substantially circular in profile.

Abstract: A rotary internal combustion engine having a housing defining a chamber is disclosed. A fixed shaft extends coaxially through the chamber. A plurality of vanes are pinned to a collar which is rotative about the shaft. One vane is rigidly secured to the collar. A cylindrical drum is positioned in the working chamber with the centerline of the drum radially offset from the centerline of the working chamber. The vanes extend through slots or apertures in the rotor to close proximity with the chamber wall. A fuel delivery system communicates with the chamber through approximately 90 degrees of the compression cycle. An exhaust opening communicates with the chamber at the end of the expansion cycle whereby the compression ratio is substantially less than the expansion ratio. In one embodiment means are provided to vary the compression and expansion ratios.

Abstract: A screw compressor including a male rotor and a female rotor forming a pair, a rotor casing enclosing the pair of rotors and cooperating therewith to define a working chamber for compressing gas, a suction port and a discharge port formed in a suction cover and a discharge cover respectively provided to the rotor casing, a slide valve mounted at one part of the rotor casing for axial movement to return gas from the working chamber to the suction side of the compressor, a radial discharge port formed in the slide valve, and an axial discharge port formed in the discharge cover and smaller in size than the radial discharge port. The slide valve is formed therein with at least one gas flow passageway for communicating the working chamber with the discharge port only when the compressor operates in a controlled capacity mode.

Abstract: A single screw, gate rotor machine in which compressible fluid is fed to the machine through a low pressure inlet and exhausts through a higher pressure outlet, in which an unloading valve is provided in the casing adjacent to the high pressure side of the gate rotor, or each gate rotor where there are two gate rotors.