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| Number | Title | Issue Date |
| 7896627 | Rotary type expander and fluid machinery A rotary type expander is provided with two rotary mechanism parts which differ from each other in displacement volume. The outflow side of the first rotary mechanism part of small displacement volume is fluidly connected to the inflow side of the second rotary mech... | 03/01/2011 |
| 7854601 | Lubricant-tight vane rotary vacuum pump A lubricant-tight vane rotary vacuum pump includes at least one pump stage (17, 18) having a safety valve (3) for controlling gas flow to the pump stage, a lubricant pump, a lubricant reservoir (30) at least partially surrounding the pump stage ... | 12/21/2010 |
| 7670119 | Multistage vacuum pump and a pumping installation including such a pump The present invention provides a multistage vacuum pump comprising at least a low pressure first stage and at least a high pressure second stage. At least one of the stages has at least one suction inlet for admitting gas to be pumped, and at least one of the stages... | 03/02/2010 |
| 7645128 | Dividing device The invention relates to a dividing device, comprising an outer housing with an inlet and at least two outlets, at least two pump chambers placed adjacently of each other in the outer housing, each with a pump chamber infeed connected to the inlet and each with a pu... | 01/12/2010 |
| 7404705 | Blending pump assembly A blending pump assembly for accurately maintaining the proper ratio of two fluid components. Flow of a first fluid is utilized to drive a fluid motor, which in turn drives a pumping mechanism to inject a proportional amount of a second fluid into the flow of the fi... | 07/29/2008 |
| 7310965 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 12/25/2007 |
| 7172039 | Down-hole vane motor The present invention generally relates to an apparatus and method for use in a wellbore. In one aspect, a downhole tool for use in a wellbore is provided. The downhole tool includes a housing having a shaped inner bore, a first end and a second end. The downhole to... | 02/06/2007 |
| 7159412 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 01/09/2007 |
| 7156922 | Multi-chamber installation for treating objects under vacuum, method for evacuating said installation and evacuation system therefor A multi-chamber installation (1) treats objects under vacuum. An evacuation system (5) is connected to a plurality of chambers (2, 3, 4). To reduce the complexity of the evacuation process, a forepump (5) has several stages (11, 12, 13... | 01/02/2007 |
| 7131826 | Blending pump assembly A blending pump assembly for accurately maintaining the proper ratio of two fluid components. Flow of a first fluid is utilized to drive a fluid motor, which in turn drives a pumping mechanism to inject a proportional amount of a second fluid into the flow of the fi... | 11/07/2006 |
| 7073346 | Compressor head, internal discriminator, external discriminator, manifold design for refrigerant recovery apparatus and vacuum sensor The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 07/11/2006 |
| 7048525 | Flow divider A flow divider for use with fluent materials, such as raw sausage. The flow divider is a combination of at least two housing bodies with chambers defined by elliptical cylindrical sidewalls. Hubs with transverse vanes have necked-down regions at one end that are rot... | 05/23/2006 |
| 7040872 | Rotary fluid machinery Pistons (41) are slidably received in a plurality of cylinders (39) disposed radially in a rotor (31), and a plurality of vanes (42) cooperating with the pistons (41) are disposed radially in the rotor (31), so that a vane c... | 05/09/2006 |
| 6929455 | Horizontal two stage rotary compressor A hermetic two stage rotary compressor having a housing with a stationary shaft fixedly mounted in the housing. A motor having a rotor and a stator is mounted in the housing with the rotor being rotatably mounted on the shaft. A pair of compression mechanisms are ro... | 08/16/2005 |
| 6929064 | Downhole pump There is disclosed an improved pump (5, 5′) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic ef... | 08/16/2005 |
| 6766783 | Rotary internal combustion engine A rotary internal combustion engine has a shaft, a compression chamber, an ignition chamber, a center wall, a first rotor, and a second rotor. The shaft is fixed to the rotors while being rotatably mounted to the compression and ignition chambers. The compression ch... | 07/27/2004 |
| 6638040 | Dry vacuum pump A dry vacuum pump comprises a scroll-type vacuum pump and a rotary-vane vacuum pump, wherein the rotary-vane vacuum pump is mounted on the side of an inlet, whereas the scroll-type vacuum pump is mounted on the side of an outlet, and then a compound-type ... | 10/28/2003 |
| 6589033 | Unitary sliding vane compressor-expander and electrical generation system The present invention provides a unitary sliding-vane type compressor-expander comprising a housing with a compressor inlet and outlet, and an expander inlet and outlet. A single rotor is disposed therein defining in cooperation with the housing a compres... | 07/08/2003 |
| 6499976 | Downhole roller vane motor A roller vane motor having a housing and a stator positioned on an inside surface of the housing. The stator has an internal wall with an inlet port and an outlet port and the portion of this internal wall at the outlet port tapers open at an angle of les... | 12/31/2002 |
| 6273694 | Rotary-piston machine A rotary-piston machine (10) comprising a housing (5) having a cavity (9), a rotor (2) received in the housing (5), which rotor (2) having a rotor axis (A) and a peripheral surface (21), inlet and outlet passages (3, 4) in communication with said cavity (... | 08/14/2001 |
| 6123526 | Multistage pump and method for assembling the pump A multistage pump includes a shaft assembly and a housing and spacing plates. The shaft assembly completed by forming shafts and rotors integrally. The spacing plates defining a plurality of successive compression chambers, each chamber is delimited by tw... | 09/26/2000 |
| 6024547 | Power-variable compressor and air conditioner using the same A multi-rotor type compressor including plural compression elements each of which includes a rotor eccentrically rotating in a cylinder and a vane which is in sliding contact with the outer peripheral surface of the rotor and partitions the inside space o... | 02/15/2000 |
| 5879138 | Two-stage rotary vane vacuum pump The invention pertains to a rotary vane vacuum pump (1) with a high vacuum stage (9, 22), with a fore-vacuum stage (8, 21), with a substantially cylindrical rotor (3) which has bearing and anchor segments (11 and 21, 22), a bearing segment (11) being situ... | 03/09/1999 |
| 5855474 | Multiple purpose two stage rotating vane device A two-stage rotating vane device comprising an outer stator defining a plurality of ports and an elliptically or cylindrically shaped interior cavity surface, with an inner stator defining a plurality of ports, the inner stator either being elliptically s... | 01/05/1999 |
| 5769617 | Vane-type compressor exhibiting efficiency improvements and low fabrication cost A rotary sliding-vane compressor is described which contains a single rotor with compressor and expander sections, together with a reduced number of parts and efficiency improvements compared to conventional compressors.... | 06/23/1998 |
| 5573387 | Vacuum pumps A rotary vacuum pump having a low vacuum stage and a high vacuum stage. Each stage includes a stator body having a bore and a rotor mounted eccentrically in the bore to form a cavity between the stator body and the rotor. The rotor of each stage has two v... | 11/12/1996 |
| 5372489 | Two stage vane type compressor A vane compressor capable of obtaining a two stage compression. The compressor has a front and rear rotor 6a and 6b for defining, together with a cylinder bores 43 and 44, first and second operating chambers 39 and 40, respectively. A refrigerant from a f... | 12/13/1994 |
| 5284426 | Rotary compressor with multiple compressor stages and pumping capacity control A multiple stage rotary compressor having a housing with a pump cavity, an orbiting ring piston in the cavity, a cylindrical post carried by the housing within the orbiting ring, a pair of vanes engaging the outer surface of the orbiting ring to define a ... | 02/08/1994 |
| 5242280 | Rotary type multi-stage compressor with vanes biased by oil pressure A multi-stage rotary type compressor is constituted in such a manner that an electric motor and a plurality of compression elements to be driven by the electric motor are disposed in a closed container and the compression elements thus-disposed are sequen... | 09/07/1993 |
| 5178522 | Method and apparatus for supplying oil to a vacuum pump A two-stage rotary vane vacuum pump includes a pre-vacuum stage having a pre-vacuum pumping chamber and an outlet valve; a main oil sump; and a first oil conduit having a first opening communicating with the main oil sump and a second opening communicatin... | 01/12/1993 |
| 5030071 | Roller van motor with fluid biassed roller A roller vane motor as described, the motor having a stator with a generally cylindrical chamber provided with fluid inlet and outlet means. A rotor is provided in the chamber to be rotatable therein, the rotor having a slot to receive a roller which form... | 07/09/1991 |
| 4960371 | Rotary compressor for heavy duty gas services A rotary gas compressor suitable for heavy duty continuous or intermittent operation with automatic inlet and outlet pressure control valves to reduce power consumption and increase volumetric efficiency. Articulated volume displacers further increase vol... | 10/02/1990 |
| 4902209 | Sliding segment rotary fluid power translation device A multiple or compound work cycle, eccentric rotor, fluid power translation device, featuring adjustable and reversible work output capability, essentially comprising: A symmetric rotor having a plurality of fixed radially extended vanes rotating closely ... | 02/20/1990 |
| 4838772 | Cartridge rotary vane pump A rotary vane vacuum pump includes a drive unit, such as an electric motor, and a pump unit, preferably constructed as a cartridge pump unit. The drive unit may take any suitable form, but the cartridge unit includes one or more pumping stages plus a pump... | 06/13/1989 |
| 4793138 | Hydrostatic drive with radially-nested radial-roller pump and motor having common displacement control ring An adjustable hydrostatic drive, particularly for the auxiliary units of motor vehicle internal combustion engines, has a pump/motor unit (2, 3) with the pump and motor arranged radially one within the other in a common housing (1) with an eccentric contr... | 12/27/1988 |
| 4770609 | Two-stage vacuum pump apparatus and method of operating the same A two-stage vacuum pump apparatus has a first stage of vacuum pump constituted by a screw-type vacuum pump and a second stage vacuum pump constituted by an oil-sealed rotary vacuum pump operative to maintain the back pressure of the first stage vacuum pum... | 09/13/1988 |
| 4716726 | Adjustable rotary vane pump An adjustable rotary vane pump for changing the direction and rate of fluid flow through the pump. The pump comprises a first pump housing having a generally cylindrical chamber therein along a central axis of the housing. A second housing is provided hav... | 01/05/1988 |
| 4697994 | Multistage discharge type rotary vacuum pump A multistage discharge type rotary vacuum pump comprises a rotor rotably mounted within a cylinder chamber and dividing the cylinder chamber into first stage and second stage working chambers. A plurality of radially extending vanes are slidably mounted i... | 10/06/1987 |
| 4627802 | Rotary vane compressor with inlet and outlet valves in the rotor A vane compressor comprising a rotor eccentrically arranged in a cylindrical housing and vanes, which define a space between the periphery of the rotor and the inner surface of the housing. The volume of the space varies during the rotation of the rotor d... | 12/09/1986 |
| 4588358 | Rotary vane evacuating pump A rotary vane evacuating pump having two series connected pumping stages is disclosed. Each pumping stage is provided as an exchangeable unit and has a housing which is detachably connected to one face of an interface flange. The housings of the pumping s... | 05/13/1986 |
