Abstract: A pair of interacting gear rims of rotary machine has been invented as a basic structural element for engines, motors and compressors. This is the most simple and most effective design to predetermine the optimal ratio of volumes of expansion and compression processes only at the expense of the form of profile of contact surface of pair gear rims of the rotary machine. This is the ideal basic element for engines, working according to an extended indicator diagram, and for single stage compressor, working with multistage effect. Applications: light and heavy vehicle engines; space power systems; heat pump systems; solar, thermal, nuclear energy systems.

Abstract: A rotary lobe pump includes two geared-together, counter-rotating shafts, to which are affixed rotors with interdigital lobes. Adjustment of the angular relationship of the rotors uses a clamping device within each rotor. The clamping device consists of a tapered, slotted bushing that is forced between a mating taper on the rotor and a locking device on the shaft by means of a flanged fastener mated to each pump shaft's threads.

Abstract: A hydraulic motor (10) comprising a front housing (12) which includes a first port (14) and a second port (16), a drive assembly (18), a drive link (22), and a shaft (24). The front housing (12) and the drive assembly (18) form a central bore (26) in which the drive link (22) and the shaft (24) are rotatably mounted. The drive assembly (18) comprises a spool valve (48) rotatably positioned within the central bore (26) and coupled to the shaft (24) by a key (140). Sealing rings (104) having a rotationally incompatible geometry (e.g., waved shapes) are used to seal interface surfaces of the rotor (54) and a high pressure seal assembly (156) is used to seal the front of a fluid chamber (154).

Abstract: A rotor profile for screw compressors is disclosed. The rotor profile is shown in a latitudinal cross-section taken along a line extending in a direction perpendicular to rotor axes, and is applied to male and female rotors used in a screw compressor having a housing defining an actuating space therein, the male rotor being rotatably set in the actuating space and having spiral teeth and roots defined between the teeth, and the female rotor being set in the actuating space to rotatably engage with the male rotor and having spiral teeth and roots defined between the teeth. The rotor profile comprises a first curve F-G determined as a circular arc and inscribed in an addendum circle of the female rotor at a point “G” around a trailing end of each tooth of the female rotor, and a second curve determined by a hyperbola function r=(&egr;·K)/(1−&egr;·cos &thgr;), wherein 1.1≦&egr;≦1.

Abstract: A discharge part structure of a compressor is disclosed. In the compressor comprising a cylinder assembly having a suction flow path and a discharge flow path, a Z-plate in the cylinder assembly for dividing an inner space into a plurality of compression spaces and for making a fluid be sucked, compressed, and discharged by being rotated by a motor unit, and vanes contacted to both sides of the Z-plate for dividing the respective compression spaces into a suction region and a compression region by reciprocation, an oil filtering space or a buffering space having a predetermined volume is formed at an outer side of a discharge flow path of the cylinder assembly. According to this, oil mixed with a fluid can be efficiently separated when the fluid is discharged, and vibration noise can be minimized.

Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.

Abstract: A rotary positive-displacement pump comprises two gear wheels which mesh with each other without encapsulation. Each gear wheel has a plurality of teeth with a profile which falls within a band of tolerance of ±{fraction (1/20)}th of the depth of the tooth with respect to a theoretical profile similar to a profile defined by a natural spline function passing through a plurality of nodal points having pre-established coordinates {X, Y}.

Abstract: A rotary vane pump, including a housing within which is rotatably mounted a rotor having a plurality of slots therein with a vane positioned for sliding movement within each of the slots. An access port is formed in the housing communicating with the rotor at a reference position in relation to the slots. The access port is sized to permit alignment of any one of the slots with the access port by rotating the rotor, maintaining the vane within the aligned one slot and at a datum within the slot, and permitting entry into the access port of an aligned slot of a stylus having a predetermined length in relation to the datum for determining the length of the vane. A determination of whether wear to the vane has met or exceeded a predetermined amount can be determined by reference to a portion of the stylus exterior to the access port.

Abstract: A gear pump comprises a casing and gear rotors disposed therein. The gear rotors are lodged in bearing sections of plain bearings that are lubricated by the pumping medium. They have at least one cooling duct which is embodied such that cooling varies along the circumference and/or in the longitudinal direction and/or in the radial direction of the plain bearing.

Abstract: The invention includes a “floating scroll” mechanism for scroll type fluid displacement apparatus. The dual orbiting scroll has spiral vanes on both sides of the end plate. In a floating scroll, the orbiting scroll is dynamically well balanced, axially and radially. The scrolls are fully or semi-axially and radially compliant for maintaining minimum contacting forces between components, hence achieving good sealing for high speed, high efficiency, low friction wear and power loss. A crank shaft-sliding knuckle and/or peripheral crank handles-sliding knuckle mechanism provide the dual orbiting scroll with radial compliant capability. A synchronizer is used to synchronize the orientation of the crank handles to avoid the mechanism from jamming during operation and start up.

Abstract: A screw vacuum pump (1) has shafts (7, 8) and rotors (3, 4) secured to the shafts. Each rotor has a central hollow chamber (31) which receives the shaft or contains in built-in components rotating along with the rotor to define a relatively thin annular slot segment (32) for cross-flow circulation of coolant. The annular slot segment is disposed between the built-in components and an inner wall of the rotor's hollow chamber and between a suction side and a delivery side of the rotor. Separate feed and discharge lines (41, 55, 63, 77, 78, 81, 89, 99, 101, 103) circulate the coolant through the annular slot segment in such a way that the coolant remains cavitation-free and bubble-free.

Abstract: A scroll-type compressor includes a housing including a suction chamber and a discharge chamber. The compressor also includes a fixed scroll including a first spiral element. Specifically, the fixed scroll is fixed to the housing, and a sealing member seals the fixed scroll and the housing. The compressor further includes an orbiting scroll including a second spiral element. Specifically, the orbiting scroll is positioned inside the suction chamber, and the first spiral element and the second spiral element interfit with each other to form a fluid pocket. Moreover, the compressor includes a driving mechanism for moving the orbiting scroll in an orbiting motion, a rotation prevention mechanism for preventing the orbiting scroll from rotating, and a first circumferential groove formed at a circumferential surface of the fixed scroll.

Abstract: Tracer material, encapsulated within a cavity of the vanes of a sliding vane pump, which is released into the discharge conduit when the vanes reach their predetermined wear limit, acting as a wear indicator.

Abstract: A rotary vane device for hydraulic transmission of mechanical energy with industrial scale measures of power and rotational velocity. The device offers high measures of both volumetric efficiency and rotational velocity and hence substantial measures of functional excellence in terms of power density and functional efficiency. Additionally the device functions without the use of reciprocating primary components and for this reason potentially offers substantial measures of excellence in terms of enhanced operational reliability and relatively low measures of radiated mechanical noise and vibration.

Abstract: A check valve retainer for a scroll compressor includes a retaining lip that fits into a recess formed in a scroll. The retaining lip may be manufactured as an integral part of the check valve retainer for press fitting or may be formed by an expansion fit locking member having a protrusion that forces a portion of check valve retainer wall into the recess. The retaining lip ensures that the check valve retainer stays attached to the scroll without risking scroll deformation.

Abstract: A rotary fluid pressure device having a housing member, a manifold assembly, a gerotor set, an end plate, and a rotatably journaled torque transfer shaft interconnected with the gerotor set and extending within the housing member and manifold assembly. The gerotor set having an internally toothed stator member and a rotating rotor member disposed within the stator member. The rotor member having a first and second axial end surface and external teeth which interengage with the internal teeth of the stator to define a plurality of expanding and contracting volume chambers. The rotor member also having a first plurality of circumferentially spaced laterally directed fluid paths which extend through the rotor for fluid connection between the manifold assembly and the volume chambers, and a second plurality of circumferentially spaced, laterally directed fluid paths interposed between the first plurality of fluid paths for sequentially channeling fluid between both axial end surfaces.

Abstract: A hydraulic motor of the disc valve type has a disc valve with a plurality of commutation slots that can sequentially register with ports in a port plate as the disc valve is rotated with respect to the port plate. The commutation slots have a geometrical configuration that is complimentary in shape to a portion of the geometric configuration of the ports in the port plate to reduce the resistance to fluid flow through the ports and the slots when the complimentary shapes move into or from superimposed registering positions.

Abstract: The present invention mainly includes a valve cock and a valve cock cover to form a structure of check valve, of which a trepan boring is set on the cover to accommodate the valve cock, and a pressure guide hole is set on the cover body to connect the high-pressure and valve cock trepan boring. A blast groove is set on the binding surface of the valve cock cover and shielding seat to release refrigerant. The valve cock is pressed against the vent hole of the shielding seat under the effect of the high-pressure chamber, and then the high-pressure refrigerant is blocked from flowing back into the low-pressure chamber. However, the high-pressure refrigerant will directly eject upward against the valve cock when the rotating turbine and fixed whirl run mutually, in addition the high-pressure refrigerant will flow into the high-pressure chamber via the blast groove.

Abstract: A shower head assembly includes a shade, a water outlet seat, a water outlet disk, a locking disk, a water outlet panel, a mounting tube, a connecting head, and a locking nut. Thus, the water outlet seat and the water outlet disk form a smaller water chamber, thereby reducing the bearing weight of the water outlet disk, the locking disk and the water outlet panel. In addition, the water outlet seat, the water outlet disk, the locking disk and the water outlet panel are combined rigidly and stably without detachment.

Abstract: To provide a gas compressor in which fretting wear due to vibration of an oil separation filter is prevented to thereby achieve an improvement in durability. A gas compressor is provided with a press-fixing unit for press-fixing end portions of an oil separation filter.