Abstract: The invention relates to a six-stroke rotary-vane internal combustion engine with hermetically sealed working space comprising a stator with at least one inlet and at least one outlet, a respective hole for at least one spark plug, and working chambers comprising of an air-fuel intake and compression, and of expansion and exhaust of combustion products working chamber; a cylindrical rotor rigidly fastened to a shaft with combustion chambers alternating with vane grooves made in the cylindrical surface and vanes fitted in the vane grooves; side walls; front and rear bearing shields. The whole working space of the engine is bound by parts rigidly and hermetically fastened to the stator. Composite prismatic pieces are placed into end grooves on both sides of the rotor, while the ends of said composite prismatic pieces are pushed by a first spring against the adjacent vanes and one of the longer sides of the composite prismatic pieces is pushed by a second spring against the side walls.

Abstract: A vane pump including a housing having a peripheral wall portion, a bottom wall portion, and a pump chamber; a rotor disposed in the pump chamber to be rotatable; a vane disposed to be slidable in the radial direction with respect to the rotor and partitioning the pump chamber into working chambers; and a reed valve that opens and closes a discharge hole of the bottom wall portion. 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 on both sides of the vane in the rotational direction communicates with each other via the pressure relief groove.

Abstract: A compressor is provided. The compressor may include a fixed wrap, and an orbiting scroll having an orbiting wrap engaged with the fixed wrap to form compression chambers. The fixed wrap and the orbiting wrap may have irregular wrap curves. At least one interference avoiding portion at which a spacing between the wraps is greater than an orbiting radius or at least one gap compensating portion at which the spacing between the wraps is smaller than the orbiting radius, in a state in which a center of the fixed scroll and a center of the orbiting scroll are aligned with each other, may be provided on a sidewall surface of the fixed wrap or the orbiting wrap, whereby frictional loss or abrasion due to interference between the wraps or a refrigerant leakage due to a gap between the wraps may be prevented.

Abstract: A multi-chamber impeller pump includes an impeller, circumferentially spaced cams defining an impeller chamber, and circumferentially spaced evacuation ports. Each cam includes an engagement edge, an arcuate cam surface sloping radially inward, and a lobe. Each evacuation port is proximal to an intersection of a respective arcuate cam surface and lobe. As the impeller rotates, a corresponding end of a leading blade contacts a respective engagement edge and then a corresponding end of a trailing blade contacts the respective engagement edge thereby forming a unit chamber between leading and trailing blades. As the impeller continues to rotate, the end of the leading blade contacts a respective lobe and displaces the leading blade to decrease the volume of the unit chamber and expel fluid from the unit chamber through a respective evacuation port. A method of using the multi-chamber impeller pump is also disclosed.

Abstract: A rotary compressor includes: a shell forming an internal space; a driving motor disposed in the internal space of the shell; a rotary shaft connected to the driving motor; a lower cylinder having a lower chamber for compressing a refrigerant and a lower roller disposed inside the lower chamber; an upper cylinder disposed on an upper side of the lower cylinder and having an upper chamber for compressing a refrigerant and an upper roller disposed inside the upper chamber; a muffler disposed on the upper side of the upper cylinder and receiving a refrigerant compressed in the upper chamber; and an intermediate plate disposed between the upper cylinder and the lower cylinder and having a rotary shaft hole through which the rotary shaft is disposed. The intermediate plate includes an opening formed around the rotary shaft hole and guiding a refrigerant compressed in the lower chamber to the muffler.

Abstract: In order to improve a compressor comprising a compressor housing, a scroll compressor unit which is arranged in the compressor housing and comprises a first stationary compressor body and a second compressor body that can be moved relative to the stationary compressor body, an eccentric drive for the scroll compressor unit, said drive having a drive member which is driven by a drive motor and which revolves about the central axis of a driveshaft on an orbital path, and an orbital path balancing mass which counteracts an unbalance due to the compressor body moving on the orbital path, so that even at high rotational speeds the long-term stability of the drive member guidance in the drive member receptacle can be ensured, it is proposed that the orbital path balancing mass is coupled to the eccentric drive such that the mass moves on the orbital path in a manner corresponding to the movement of the drive member but is uncoupled with respect to the transmission of tilting moments to the drive member.

Abstract: Disclosed are a compressor and an air conditioner having same. The compressor includes: a first-stage cylinder, including a first-stage compression chamber; and a second-stage cylinder, including a second-stage compression chamber and a gas storage chamber. Refrigerant flowing out of the first-stage compression chamber flows through the storage chamber and enters into the second-stage compression chamber, and a flow area of the gas storage chamber is larger than an area of a gas outlet of the first-stage compression chamber. The compressor effectively solves problems that power consumption of the compressor is increased and performance is reduced due to large resistance loss in the cylinder of the compressor.

Abstract: An eccentric screw pump has a stator, a rotor in the stator, a drive for the rotor, and a pump housing between the stator and the drive and having an opening between for receiving the medium being pumped. A releasable drive-end coupling connects a connecting shaft of the drive to a coupling rod, and a rotor-end releasably connects the coupling rod to the rotor at a separation point. A rotor stub connects the rotor to the rotor-end coupling and is separable from the rotor at the separation point. A drive-end housing collar secures the pump housing to the drive. A rotor-end housing collar has a fixed first element fixed relative to the pump housing and an axially displaceable second element that is releasably fixable to the stator and that can be pushed axially toward the housing opening of the pump housing onto the first element to expose the separation point.

Abstract: A pneumatically driven apparatus, including a hand guided and/or hand held pneumatic power tool, includes a pneumatic rotary vane (PRV) motor, a working element and a gear arrangement for transmitting a rotational movement and torque. The PRV motor includes a housing defining a cylindrical chamber extending along a cylinder axis, and a cylindrical rotor located in the chamber and extending along and rotatable about an axis running to the cylinder axis. The rotor includes radially movable vanes forced radially outwards during rotation of the rotor. The gear arrangement is a magnetic gear arrangement, and that the rotor of the motor includes permanent magnets attached thereto between the vanes, so that the rotor of the PRV motor forms one of the rotating components of the magnetic gear arrangement.

Abstract: Some embodiments are directed to a positive displacement pump comprising: a pipe having a first end secured to a transmission area and a second end ending in a cylinder secured to a discharge area, the pipe comprising a suction opening and the discharge area comprising a discharge opening, a drive shaft with one end situated at the cylinder, a piston pressed against the cylinder by elastic means so as to prevent fluid from moving between the pipe and the discharge area, in which the pump further comprises means for moving the piston elastically away from the cylinder and keeping it at a predetermined distance from same. Some other embodiments are directed to a method for cleaning this pump.

Abstract: A rotary piston and cylinder device (1) comprising a rotor (2), a stator (4), a rotatable shutter (3), the rotor and the stator comprising surface portions which define a chamber, wherein the rotor comprises a first surface portion (2A) and the stator comprises substantially two surface portions (4a; 4b?), and the two surface portions of the stator neighbour each other.

Abstract: A rotary compressor includes a roller that is provided with oil grooves concavely formed in a centrifugal direction from an inner circumferential surface of the roller facing an eccentric portion. The oil grooves are disposed at positions not overlapping an intake and a discharge port in an axial direction.

Abstract: A method of operating a rotary engine including a rotor engaged to a shaft and rotationally received in a housing to define a plurality of working chambers of variable volume, including delivering a pilot quantity of fuel into a pilot cavity in successive communication with the working chambers, igniting the pilot quantity of fuel within the pilot cavity, and delivering a main quantity of fuel into the working chambers downstream of the successive communication of the pilot cavity with the working chambers, where at least one of the pilot quantity and the main quantity is varied between successive rotations of the shaft.

Abstract: A screw vacuum pump comprises a housing forming a pumping chamber, wherein the housing is made of aluminum or an aluminum alloy. Further provided are two screw rotors arranged in the pumping chamber, each screw rotor comprising at least one displacer element having a helical recess for forming a plurality of windings, wherein the at least one displacer element is made of aluminum or an aluminum alloy. Between the region in which prevail 5% to 30% of the outlet pressure and a pressure-side end of the rotor (pump outlet), at least six, particularly at least eight, and with particular preference at least ten windings are provided.

Abstract: A single-screw compressor includes a screw rotor with a helical groove, a cylindrical wall rotatably housing the screw rotor, a gap adjuster mechanism, and a gear-shaped gate rotor having a plurality of flat gates. The gate rotor is arranged outside the wall. Some of the gates enter a space inside the wall via an opening formed in the cylindrical wall and mesh with the screw rotor. A fluid is compressed in a compression chamber defined in the helical move by the screw rotor, the gates meshing with the screw rotor, and the wall. The gap adjuster mechanism avoids contact between a front surface of the gate rotor toward the compression chamber and a sealing surface of the wall facing the front surface, by displacing at least one of the gate rotor and the sealing surface of the wall in an axial direction of the gate rotor.

Abstract: A scroll compressor may include a first scroll and a second scroll orbiting relative to the first scroll to form compression chambers, a discharge port provided in the first scroll to discharge refrigerant compressed in the compression chamber, a discharge passage formed through the first discharged through the discharge to an upper side of the frame, and a discharge cover coupled to the first scroll and having a space to accommodate end portions of the discharge port and the discharge passage to guide the refrigerant discharged through the discharge port to the discharge passage. A volume of a discharge space defined in the space by the first scroll may be 4.5 or more, obtained by dividing a volume of the discharge space by a total volume of an initial compression chamber among the compression chambers.

Abstract: A blower may include a blower housing that may include a plurality of rotor chambers and a plurality of rotors. The plurality of rotors may be substantially identical and each may include a twist angle and a helix angle. The rotors and the blower housing may be configured to create internal fluid compression when the rotors are rotating at a first rotational speed and not to create internal fluid compression when the rotors are rotating at a second rotational speed. The rotors and the blower housing may be configured to create the internal fluid compression without backflow slots in the blower housing. The twist angle may include the angular displacement of lobes of the plurality of rotors between axial ends of the plurality of rotors. The helix angle may be a function of the twist angle and a pitch diameter of the plurality of rotors.

Abstract: A screw compressor for a utility vehicle includes at least one housing and at least one air-oil separator holder arranged at the housing. The air-oil separator holder is manufactured from a non-corrosive material. A relief valve is provided, which is arranged in the air-oil separator holder and by which the interior of the screw compressor can be relieved of pressure.

Abstract: A screw compressor includes two screw rotors and two control sliders that are arranged one behind the other in a slider channel. The control sliders have a combined position with mutually facing end surfaces sealing tightly with each other, and being movable together and have a separated position, with positionable spacing from one another, forming an intermediate space. In a transfer position between the combined and separated positions, the control sliders form an inflow chamber into which the medium to be compressed flows out of one of the compression chambers by passing between the mutually facing end surfaces of the control sliders. One of the control sliders is provided with at least one outflow outlet that is adjacent to the inflow chamber and through which the medium from the inflow chamber enters an outflow opening in the slider channel that overlaps with the outflow outlet in this transfer position.

Abstract: A scroll compressor includes a housing and a compression mechanism accommodated in the housing. The housing includes a first housing member having an annular partition wall and a second housing member. The partition wall includes a fastened portion that is thicker than other portions in a circumferential direction of the partition wall. The compression mechanism includes a fixed scroll member and an orbiting scroll member. The fixed scroll member includes a fixed spiral wall extending spirally and an outer circumferential wall that surrounds the fixed spiral wall. The outer circumferential wall includes a recess forming portion having a recess recessed inward in the radial direction. The recess is located at a part of the outer circumferential wall opposed to the fastened portion in the radial direction.