Abstract: A scroll compressor is provided, comprising: a compression mechanism comprising a non-orbiting scroll member and an orbiting scroll member, wherein the orbiting scroll member is axially displaceable between an engagement position and a disengagement position; a main bearing housing adapted to support the compression mechanism; a back pressure chamber formed between the orbiting scroll member and the main bearing housing, wherein the back pressure chamber is in communication with at least one of the compression chambers via a communication passage provided in the orbiting scroll member or the non-orbiting scroll member and is adapted to apply a back pressure to the orbiting scroll member to bias the orbiting scroll member toward the engagement position; and a first sealing means provided between the back pressure chamber and a suction zone of the compression mechanism and capable of maintaining sealing when the orbiting scroll member is axially displaced.

Abstract: An engine includes a housing defining an annular bore and a piston assembly disposed within the annular bore. The engine also includes a rotary valve comprising a circular faceplate and a wall structure disposed at an outer periphery of the faceplate, a portion of the at least one rotary valve disposed within the annular bore, and a rotary drive mechanism connected to the rotary valve and configured to rotate the rotary valve between a first position to align an opening of the wall structure with the annular bore to allow the piston of the piston assembly to travel within the annular bore from a first location relative to the rotary valve to a second location relative to the rotary valve and a second position to define a chamber relative to the piston of the piston assembly at the second location.

Abstract: A scroll compressor includes a first scroll including a fixed wrap, a second scroll comprising an orbiting wrap, and a boss portion, a rotating shaft including an eccentric portion inserted into the boss portion of the second scroll to transfer a rotational force, a frame having a shaft hole, a first bearing provided between the shaft hole of the frame and an outer circumferential surface of the rotating shaft, and a second bearing provided between an inner circumferential surface of the boss portion and an outer circumferential surface of the eccentric portion of the rotating shaft, wherein a differential pressure space portion is formed between the first bearing and the second bearing in a radial direction, and has a radial cross section wider than a radial gap between an inner circumferential surface of the second bearing and the outer circumferential surface of the eccentric portion.

Abstract: A scroll compressor comprising a fixed scroll (15); an orbiting scroll (16) supported in a manner allowing for orbiting motion; a discharge port through which a fluid compressed by the two scrolls (15, 16) is discharged; an end plate step portion (16E) provided on an end plate of the orbiting scroll (16) formed so that a height of the end plate is higher on a center portion side in the direction of a spiral wrap and lower on an outer end side; and a wrap step portion (15E) provided on a wall portion of the fixed scroll (15) that corresponds to the end plate step portion (16E) so that a height of the wall portion is lower on the center portion side of the spiral and higher on the outer end side; wherein the orbiting scroll (16) is treated for surface hardening and the fixed scroll (15) is not treated for surface hardening.

Abstract: A rotary drive includes a housing; a shaft rotatably mounted within the housing and rotatable about a drive axis; a passage internal the housing and extending circumferentially about the shaft; a stator vane within the passage; and a rotor vane within the passage. The stator and rotor vanes are movable between respective closed positions in which the stator and rotor vanes separate the passage into a circumferentially expanding chamber in fluid communication with an inlet in the housing and a circumferentially collapsing chamber in fluid communication with an outlet in the housing, and respective open positions in which the rotor vane is movable circumferentially past the stator vane during rotation of the shaft.

Abstract: Various designs for hydraulic devices are disclosed including hydraulic devices that can include a rotor and a ring are disclosed. The rotor can be disposed for rotation about an axis and can have a plurality of plurality of vanes extending therefrom. The ring can be disposed at least partially around the rotor and the ring, and the rotor can be in communication with a port for ingress or egress of the hydraulic fluid to or from adjacent the rotor. The ring defines a cavity adjacent to and in communication with the port, the cavity allows the hydraulic fluid to be disposed adjacent at least one of the plurality of vanes when the at least one of the plurality of vanes is transiting the port.

Abstract: A Revolving piston rotary annular cylinder rotary valve continuous flow and combustion expansible chamber devices, engine machine systems with an outer annular cylinder housing assembly having a central axis, having one or a plurality of balanced pistons attached to a rotor within of the outer housing whereby, a plurality of relatively air tight compartments are formed between the interior surface of the outer housing, the outer surface of the rotor and piston assembly with the volume of said compartment varying as a function of the rotative position of the inner cylinder and rotor piston assembly in relation to the rotary isolating valve connected at one end to the housing upstream before the intake port, another end of valve being in rotary contact with outer peripheral surface of piston and said rotor assembly having an inlet for receiving any fluid and an outlet for providing said fluid.

Abstract: A pumping unit is provided, including a primary vacuum pump of a multistage dry type, including at least four pumping stages fitted in series; and a two-stage Roots vacuum pump, including a first pumping stage and a second pumping stage fitted in series, the second pumping stage being fitted in series with and upstream of a first pumping stage of the primary vacuum pump in a direction of flow of gases to be pumped, in which a ratio of a volume displacement of the first pumping stage of the two-stage Roots vacuum pump to a volume displacement of the second pumping stage of the two-stage Roots vacuum pump is less than six, and in which a ratio of a volume displacement of the second pumping stage of the two-stage Roots vacuum pump to a volume displacement of the first pumping stage of the primary vacuum pump is less than six.

Abstract: A rotary internal combustion motor has a stator that houses a compartment defined by two opposite planar surfaces and by an annular surface with elliptical profile, inside which a rotor rotates, which includes a cylindrical drum surrounded by an annular chamber, which is divided into multiple portions by a regularly spaced set of radial blades that are slidingly housed in the cylindrical drum. The motor also has at least one pair of inlet openings, at least one pair of outlet openings, at least one pair of injectors, at least one pair of spark plugs, and at least one pair of pre-heating spark plugs.

Abstract: An automotive auxiliary assembly vacuum pump includes a housing composite structure with an electric motor section, a pump section, a pump inlet opening, and a pump outlet opening, a motor housing part, a bearing plate which closes the motor housing part proximally, and a pump rotor with a rotor body. The electric motor section includes a motor rotor which is surrounded by the motor housing part and which is closed by the bearing plate. The pump section includes a pump housing which defines a pump chamber and which includes a closure element, at least one pump chamber inlet opening, and at least one pump chamber outlet opening. The pump housing is formed at least by axially proximal and axially distal thrust washers and a radial thrust ring. Only the bearing plate and the axially proximal thrust washer are provided as a single-piece flange element.

Abstract: The pneumatic drill has member defining an air input and an air output and a housing defining an internal cylindrical chamber having bearing surfaces having a through axis. A driven shaft is coupled to the tool engaging chuck that defines a plurality of longitudinal slots. The driven shaft is disposed within the chamber and has a longitudinal axis offset from the through axis. A plurality of vanes each being partially formed of graphite that are individually disposed within one of the plurality's of longitudinal slots. Two of the vanes, the housing, and the driven shaft define a moving compression chamber.

Abstract: A vacuum pump having a housing which limits a working space and having a rotor, rotatably mounted in the housing about a rotor axis, the rotor guides a vane being movably mounted in the radial direction, the vane has a transverse extent, and the vane divides the working space into a suction side having a suction inlet and a pressure side having a pressure outlet, the housing has at least one oil outlet, the oil outlet is closed by a relief valve, the relief valve assumes an open position, when a limit pressure lying above a nominal pressure is exceeded in the working space, and the transverse extent of the vane is large enough that when the vane passes the oil outlet, the oil outlet is closed by the vane, so that there is no fluid connection between the suction side and the pressure side over the oil outlet.

Abstract: An impeller is attached to a rotary shaft provided in an inner space of a housing and includes a tube fixed to the rotary shaft and a plurality of blades protruding toward an outer diameter direction from the tube. A tip of each blade is in slidable contact with an inner peripheral surface of the housing. Each blade has a shape curved toward a rotation-direction rear side of the rotary shaft in a free state and includes an extension surface on a rotation-direction front side of the rotary shaft and a compression surface on the rotation-direction rear side of the rotary shaft. A curvature radius of a root on the compression surface in the blade is formed larger than a curvature radius of a root on the extension surface in the blade.

Abstract: Provided a scroll compressor including: a casing, an internal space in which is sealed; a drive motor that is configured with a stator which is located in the internal space, and a rotator which rotates within the stator, and that has an internal flow passage and an external flow passage that passes through the drive motor itself; a rotation shaft that is connected to the rotator of the drive motor; a compression unit that includes a first scroll which is provided below the drive motor, and a second scroll which is engaged with the first scroll; a discharge pipe that communicates with an upper space of the internal space, which is formed above to the drive motor; and an oil separation member that is provided between the drive motor and the discharge pipe, and from whose upper surface a space is formed to a predetermined depth.

Abstract: A first injection port is open to a suction chamber of a plurality of chambers at some rotation phases, and is located within an angular range defined by a line connecting a winding-end contact point of an orbiting scroll at a compression start phase with a base circle center of a fixed scroll and one of two lines tangent to a winding-end point locus of a tip seal at a tooth tip of a spiral body of the orbiting scroll and passing through a base circle center of the orbiting scroll, the one line of the two tangent lines being closer to the winding-end contact point. The first injection port does not interfere with the tip seal at the tooth tip of the spiral body of the orbiting scroll.

Abstract: A single-screw compressor includes a screw rotor with helical grooves, a gate rotor assembly including first and second gate rotors, and a casing housing the screw rotor and the gate rotor assembly. A rotor support member is attached to the first and second gate rotor rotors, and is rotatably supported by the casing. Each of the helical grooves of the screw rotor has a front sidewall surface and a rear sidewall surface. Each of the gates of the first gate rotor slides only on the front sidewall surface of the helical groove in which the gate has entered. Each of the gates of the second gate rotor slides only on the rear sidewall surface of the helical groove in which the gate has entered. The first and second gate rotors of the gate rotor assembly are coaxially arranged and relatively displaceable in a circumferential direction.

Abstract: A system includes a compressor configured to compress a vapor, or a vapor and liquid mixture, and a first rotor of the compressor disposed on a first shaft, where the first rotor includes a first plurality of pockets in a first body portion to form a first semi-hollow internal volume or a plurality of flanks and/or a first plurality of flutes on a first external surface of the first rotor, where the plurality of flanks or the first plurality of flutes comprises a first pitch to form first variable leads.

Abstract: An electric compressor includes a housing including a motor housing, a compressor housing, and a shaft support member, which are fastened with a fastening member, and a fluid passage. The shaft support member has a fitted surface fitted onto an opening of the motor housing and a flange portion extending from the fitted surface and interposed between a first end face of the motor housing and a second end face of the compressor housing. The flange portion has a through hole through which the fastening member is inserted and a passage-forming hole through which a first recessed portion and a second recessed portion are in communication with each other. The through hole and the passage-forming hole are arranged in a circumferential direction of the flange portion. The fluid passage is formed at least by the first recessed portion, the second recessed portion, and the passage-forming hole.

Abstract: A progressing cavity device operates as a motor to impart torque to a bit. A stator of the device defines an internal profile having uphole stages with a first dimension being less than a second dimension of downhole stage. A rotor has an external profile with a constant outer dimension along its length. Disposed in the stator, the rotor defines cavities with the stator and is rotatable with pumped fluid progressing in the cavities from the uphole to downhole to transfer torque to the drive toward the downhole end. Although the rotor is subjected at the downhole end to a reactive torque from the bit, the interference fit of the rotor's constant dimension with the stator's downhole stages is less than with the uphole stages, which can mitigate issues with heat buildup in the downhole stages. The device can also operates as a progressing cavity pump.

Abstract: The external gear pump may include a housing, a first gear, a second gear, and an end plate. The housing may define an inlet and a discharge port. The first gear may include a first tooth and a second tooth. The second gear may be disposed within the housing and include a third tooth that engages the first tooth and the second tooth to form a pressure pocket. The end plate may be disposed within the housing. The first gear and the second gear may each be rotatably coupled to the end plate. The end plate may define a discharge channel and a bridge portion. The discharge channel may extend between the discharge port and the bridge portion. The bridge portion may define a relief portion and the relief portion may be configured such that fluid is communicated from the pressure pocket to the discharge port.