With Axially Spaced Working Members Patents (Class 418/200)
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Patent number: 12188472Abstract: A rotor assembly, a compressor and an air conditioner. The rotor assembly includes a first rotor, including a first working portion and a second working portion coaxially arranged, the first working portion and the second working portion are rotatable about a first axis; the first working portion includes a plurality of first helical blades, with a first blade groove being formed between adjacent two of the plurality of first helical blades; at least one first air pressure groove is provided on a first end face of the first working portion away from the second working portion.Type: GrantFiled: October 19, 2021Date of Patent: January 7, 2025Assignee: Gree Electric Appliances, Inc. of ZhuhaiInventors: Hua Liu, Zhiping Zhang, Xiaokun Wu, Yushi Bi
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Patent number: 12098720Abstract: The present disclosure provides a compressor and an air conditioner. The compressor includes a housing; a first rotating shaft mounted in the housing; a connecting assembly sleeved on the first rotating shaft; and a first rotor assembly including a first rotor and a second rotor coaxially disposed on the connecting assembly. The connecting assembly carries the first rotor and the second rotor to rotate about the first rotating shaft together. The connecting assembly is configured to limit the relative positions of the first rotor and the second rotor, such that there exists a clearance between the first rotor and the second rotor. The present disclosure can maintain a clearance between the first rotor and the second rotor without increasing the number of components of the compressor.Type: GrantFiled: October 25, 2021Date of Patent: September 24, 2024Assignee: Gree Electric Appliances, Inc. of ZhuhaiInventors: Hua Liu, Zhiping Zhang, Zhongkeng Long, Cong Cao
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Patent number: 12000286Abstract: A gear wheel (10) for a hydraulic apparatus is rotatable about an axis of rotation (H-H) and comprises a plurality of teeth (11) having a sectional profile (P) and being adapted to mesh with respective teeth of another gear wheel during a rotational motion about the axis of rotation (H-H), wherein at least one tooth (11) is shaped so as to have at least one cutting edge (12) configured to remove material, in particular chips, from a body which is contacted by the cutting edge during the rotation of the gear wheel (10), wherein the cutting edge (12) is defined by at least one groove (14) which is lowered by amount from 0.2% to 5% of the height (H?) of the tooth (11), said the groove (14) decreasing away from the cutting edge (12) along the profile (P).Type: GrantFiled: July 30, 2020Date of Patent: June 4, 2024Assignee: Settima Meccanica S.r.l.Inventors: Manuele Rossi, Andrea Ceruti
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Patent number: 11766675Abstract: An improvement kit for heavy duty grinders to process thick wastes in commercial and residential applications made of a two directional cutter having a two-blade cutter edge, a multi aperture die cup, a shaft for pump with an anti-rotational feature, a mimicking component for mimicking three phase drive to a motor stator on the pump, a control board/panel and circuitry and wiring to interconnect the components and a stator winding that allows the kit to provide a grinding solution for contamination including common household trash, a contraband material used in methamphetamine and opioid addictions, a fibrous product including wet wipes with nylon products, and heavy materials that can cause a typical grinding system to be “jetted” which requires continual maintenance and costly repairs.Type: GrantFiled: December 8, 2020Date of Patent: September 26, 2023Inventor: Joel Hobbs
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Patent number: 10197057Abstract: Disclosed is a gear pump including a pumping chamber in which a first shaft and a second shaft are rotated about their respective axes, each of the first and second shafts supporting at least one hydraulic-pumping element that hydraulically pumps a fluid in the pumping chamber, the at least one hydraulic-pumping element of each of the first and second shafts being positioned in the pumping chamber and each having at least one first radial projection. In the pumping chamber, each of the first and second shafts further supports at least one mechanical drive pinion that rotates each of the first and second shafts, each mechanical drive pinion having second radial projections. The at least one mechanical drive pinion is separate from the at least one hydraulic-pumping element, and the number of the at least one first radial projection and of the second radial projections is different.Type: GrantFiled: February 17, 2016Date of Patent: February 5, 2019Assignee: GEORGES BRIERE S.A.Inventor: Olivier Briere
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Patent number: 9791177Abstract: A cryogenic refrigerator includes a compressor for installation on a stationary component, an expander for installation on a rotating component, and a rotary joint fluidly coupling the compressor with the expander. The rotary joint includes: a rotor fixed to the rotating component and coaxial with its rotational axis; a stator disposed adjacent to the rotor to form a clearance between the rotor and the stator, and fixed to the stationary component; a first high-pressure flowpath and a second high-pressure flowpath, extending between the rotor and stator through the clearance, and a working-gas sealing area dividing the clearance into a first high-pressure section communicating with the first high-pressure flowpath, and into a second high-pressure section communicating with the second high-pressure flowpath.Type: GrantFiled: February 16, 2016Date of Patent: October 17, 2017Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.Inventor: Mingyao Xu
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Patent number: 9394901Abstract: A modular symmetrical asphalt pumping system providing a series of field-configurable gear pumps and meters usable to safely and efficiently pump viscous molten fluids, such as, asphalt and similar bituminous materials. The system utilizes highly symmetrical physical geometries and modular components to allow for the development of multiple pump configurations using a reduced quantity of parts. Preferred arrangements of the system reduce pump pulsing and cavitation.Type: GrantFiled: June 14, 2011Date of Patent: July 19, 2016Inventor: Kevin Thomas Hill
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Patent number: 8944792Abstract: A metering pump or segment, and a metering pump assembly comprising a plurality of the metering pumps or segments, are disclosed. The drive shaft assembly for driving the pump gears of each metering pump or segment is coaxially aligned with the longitudinal axis of the pump or segment, as is the fluid inlet. The single drive shaft assembly is utilized to drive all of the metering pumps or segments comprising the metering pump assembly, and the different metering pumps or segments are fluidically connected together by means of a common fluid passageway. In addition, the different metering pumps or segments can be interchanged or exchanged so as to permit different metered fluid output volumes to be outputted at different predetermined locations, and the dispensing volumes can also be added together.Type: GrantFiled: May 18, 2010Date of Patent: February 3, 2015Assignee: Illinois Tool Works Inc.Inventor: Grant McGuffey
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Publication number: 20140079581Abstract: The present invention relates to a rotor for a vacuum pump having a roots pumping mechanism, the rotor comprising at least two hollow lobes, each lobe having an outer wall which defines a lobe profile, a hollow cavity generally inward of the outer wall, and at least one strengthening rib located in the cavity to resist stress on the lobes generated during rotation.Type: ApplicationFiled: April 23, 2012Publication date: March 20, 2014Applicant: EDWARDS LIMITEDInventors: Nigel Paul Schofield, Stephen Dowdeswell
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Patent number: 8636487Abstract: A hydraulic pump is disclosed. The hydraulic pump may have a first fluid section (12), a second fluid section (14), and an input shaft (16) extending through the first fluid section and the second fluid section. The input shaft may have a first end (44), a second end (46), and a mid-portion (48) located between the first and second ends. The hydraulic pump may also have a first bearing (30) configured to continuously support the first end of the input shaft, and a second bearing (32) configured to continuously support the second end of the input shaft. The hydraulic pump may further have a third bearing (56) configured to intermittently support the mid-portion (58) of the input shaft.Type: GrantFiled: April 26, 2007Date of Patent: January 28, 2014Assignee: Perkins Engines Company LimitedInventor: Scott Laurence Mitchell
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Patent number: 8496457Abstract: A gear pump includes a driven gear and an idler gear each mounted for rotation in a housing. The driven gear and the idler gear include respective gear teeth in a meshing relationship and forming an inlet space and an outlet space in the housing and adjacent to the meshing gear teeth. The inlet space is in fluid communication with the inlet port and the outlet space is in fluid communication with the outlet port. A flow indicating element is located in the housing and is mounted for rotation independent of the driven gear and the idler gear. The flow indicating element is configured to be rotated by the viscous fluid to indicate when the fluid is moving from the inlet port and inlet space to the outlet space and outlet port.Type: GrantFiled: October 31, 2011Date of Patent: July 30, 2013Assignee: Nordson CorporationInventor: Leslie J. Varga
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Patent number: 8387648Abstract: Device for equalizing a liquid flow in a flow taking place through a device formed of at least two liquid-moving elements located on shafts (10, 11), in which case the flow channel is formed of a hollow shaft (10), a flow opening (16) in its wall and a flow groove (14) for leading the liquid to the liquid-moving elements. The liquid-moving element (e.g., 13) is located on the shaft (10), in a rotating manner that regulates the size of the flow opening (16).Type: GrantFiled: February 3, 2009Date of Patent: March 5, 2013Inventor: Pekka Leskinen
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Publication number: 20100266433Abstract: A multi-stage dry pump includes: a plurality of pump chambers each including a cylinder and a rotor housed in the cylinder; a first rotor shaft that is a rotation shaft of the rotors; a fixed bearing that rotatably supports the first rotor shaft and restricts a movement thereof along an axis direction of the first rotor shaft; and a free bearing that rotatably supports the first rotor shaft and permits a movement thereof along the axis direction of the first rotor shaft; wherein: the plurality of pump chambers is disposed between the fixed bearing and the free bearing; and a first pump chamber of the plurality of pump chambers which has a lower pressure and on the aspiration side is placed in proximity to the fixed bearing.Type: ApplicationFiled: November 12, 2008Publication date: October 21, 2010Applicant: ULVAC, INC.Inventors: Toshio Suzuki, Tomonari Tanaka
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Patent number: 7611340Abstract: A complex dry vacuum pump including a root rotor and a screw rotor is disclosed for manufacturing semiconductors and/or displays in a vacuum state in a process chamber, and discharging gaseous material and/or by-products generated during manufacturing to the exterior of the process chamber. The pump can provide high gas compression transfer efficiency so as to form a vacuum in the process chamber and/or keep high gas compression transfer efficiency when the gaseous material and/or by-products are discharged. Balance between the root rotor and the screw rotor can prevent vibration and noise generated in the vacuum pump, and molding material associated with the pump may allow a stator coil to be separated and prevent various by-products from flowing from the vacuum pump.Type: GrantFiled: July 26, 2007Date of Patent: November 3, 2009Assignee: LOT Vacuum Co., Ltd.Inventors: Tae-Kyong Hwang, Myung Keun Noh, Heaung Shig Oh
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Publication number: 20090214372Abstract: A new and improved remote, hot melt adhesive metering station (510), for supplying predetermined or precisely metered volumes of hot melt adhesive material toward applicator head or dispensing nozzle structures, comprises a plurality of rotary, gear-type metering pumps (518) which are arranged in a compact, longitudinally spaced manner upon an axially elongated drive gear manifold (512) such that the rotational axes of the plurality of rotary, gear-type metering pumps (518) are disposed parallel and adjacent to one side of the axially elongated drive gear manifold (512).Type: ApplicationFiled: September 18, 2006Publication date: August 27, 2009Inventors: Grant Mcguffey, Mel Steven Lesley, Daniel D. Bourget
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Publication number: 20090148323Abstract: The present invention relates to a rotary machine that can be employed in different applications such as, for example, a combustion engine or compressor. The invention further relates to an assembly of two or more rotary machines and a combustion engine based on the rotary machine. The machine is substantially composed of a helical screw-shaped rotor connected to an outgoing shaft journal, which screw-shaped rotor rotates in a cylindrical housing. The machine is further provided with rotating chamber dividing bodies whose rotation is synchronised with the rotating screw-shaped rotor. The chamber dividing bodies divide the helical screw grooves into chambers whose volume varies with rotation of the screw-shaped rotor.Type: ApplicationFiled: January 5, 2007Publication date: June 11, 2009Applicant: Terje ScheenInventor: Terje Scheen
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Patent number: 7192262Abstract: A twin-shaft vacuum pump includes two shafts and two rotors supported on respective shafts and cooperating with each other for producing a pumping effect, with each rotor being formed of a plurality of discoid components.Type: GrantFiled: January 6, 2004Date of Patent: March 20, 2007Assignee: Pfeiffer Vacuum GmbHInventors: Christopher-Mark Rippl, Juergen Wagner
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Patent number: 7008200Abstract: According to one embodiment of the invention, a gerotor apparatus includes an outer gerotor having an outer gerotor chamber, an inner gerotor, at least a portion of which is disposed within the outer gerotor chamber, and a synchronizing apparatus operable to control the rotation of the inner gerotor relative to the outer gerotor. The inner gerotor includes one or more entrance passages operable to communicate a lubricant into the outer gerotor chamber.Type: GrantFiled: February 5, 2003Date of Patent: March 7, 2006Assignees: The Texas A&M University System, StarRotor CorporationInventors: Mark T. Holtzapple, George A. Rabroker, Thomas J. Beck, Mark Ehsani, Matthew M. Whiteacre, Michael Kyle Ross, Gary P. Noyes
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Patent number: 6799956Abstract: A twin cylinder rotary compressor including first and second cylinders; a crankshaft having first and second eccentrics mounted thereon, the first eccentric disposed within the first cylinder, the second eccentric disposed within the second cylinder; and a separator plate disposed between the first and second cylinders and having a first piece and a complementary second piece. Each of the first and second pieces includes an interior surface defining a semi-circular recess. The interior surface and the semi-circular recess of the second piece is complementary to the interior surface and the semicircular recess of the first piece, respectively, such that the semi-circular recesses combine to form a circular bore, which closely captures a portion of the crankshaft located between the first and second eccentrics.Type: GrantFiled: April 15, 2003Date of Patent: October 5, 2004Assignee: Tecumseh Products CompanyInventors: Zer Kai Yap, David Lee Black
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Patent number: 6773243Abstract: Rotary piston machine for compressible media, with rotary pistons sealed tight in a common housing and rotatable with one another in a controlled manner, the rotary pistons having a plurality of disk-shaped sections engaging in one another in pairs, whose thickness and/or diameter decreases in the direction of the pressure side, each disk having a surface area and a core area connected respectively by an interface area, the sector angles of the surface area and of the core area of a respective disk not being identical, the disks having various transverse profile contours periodically recurring along the piston axes and each disk being offset at an angle to the two adjacent disks of the same rotor in a such a way that these three disks have a common area section and form a chamber.Type: GrantFiled: August 25, 2003Date of Patent: August 10, 2004Assignee: Ateliers Busch S.A.Inventor: Ulrich Becher
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Patent number: 6729855Abstract: An oil pump for an internal combustion engine includes a pump body with a first gear chamber and a second gear chamber, and a cover mounting to the pump body. The pump also has a check valve and a pressure relief valve in fluid communication with the gear chambers. The oil pump has a supply set of intermeshing involute spur gears in the first gear chamber with nine involute teeth. A return set of intermeshing involute spur gears with the same gear profile as the supply gears is housed in the second gear chamber. Both sets of gears are driven by a common drive shaft so that the pump may be retrofitted to existing engines. The profile of the gears provides for improved pump volume without increasing angular velocity or gear diameter over gears of the prior art. The return gears are deeper than the supply gears to provide an improved supply to return flow ratio.Type: GrantFiled: February 1, 2002Date of Patent: May 4, 2004Assignee: S & S Cycle, Inc.Inventors: James B. Havlik, Brent Glick, Todd Olson
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Patent number: 6679692Abstract: A modular oil pump for use in combination with an internal combustion engine having a dry sump lubrication system. The device features a first gerotor pump having an intake port engageable in communication with at least one engine sump and having an discharge port engageable in sealed communication with a fluid reservoir for the dry sump system. A second gerotor pump, engageable in sealed communication with the fluid reservoir has a discharge port fluidly engageable with the engine lubrication system oil supply conduit. Both the first pump and second pump are assembled from separate housings, and cooperatively engaged inner and outer gears sized for rotation and in line mounting on the engine crankshaft inside a cavity in the housings. The volume pumping capacity of the first pump at a ratio to efficiently drain fluid and gas from the engine sumps and supply the reservoir with a constant supply of lubrication fluid.Type: GrantFiled: July 12, 2002Date of Patent: January 20, 2004Inventor: James J. Feuling
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Patent number: 6666666Abstract: A pump comprises multiple, axially stacked positive displacement fluid device sections, such as circumferential piston pumps having chambers and contra-rotating chambers. The device can be similarly employed as a fluid motor. The stacked sections are arranged within an outer retaining barrel in one or more stages. The pump is particularly suitable for installation downhole in the casing of a wellbore. Each section comprises a pair of rotors fit to shafts which are rotatably supported on hard faced bearings between the shafts and the bosses. Each pump section draws fluid from an inlet port and discharges fluid to a common and contiguous discharge manifold. The inlets of the pump sections for a suction stage communicate with a fluid source. Cross-over sections route fluid between stages. Successive pressure stages draw fluid from the cross-over fit to the preceding stage's discharge manifold.Type: GrantFiled: May 28, 2002Date of Patent: December 23, 2003Inventors: Denis Gilbert, Arnoud Struyk
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Publication number: 20030223896Abstract: A pump comprises multiple, axially stacked positive displacement fluid device sections, such as circumferential piston pumps having chambers and contra-rotating chambers. The device can be similarly employed as a fluid motor. The stacked sections are arranged within an outer retaining barrel in one or more stages. The pump is particularly suitable for installation downhole in the casing of a wellbore. Each section comprises a pair of rotors fit to shafts which are rotatably supported on hard faced bearings between the shafts and the bosses. Each pump section draws fluid from an inlet port and discharges fluid to a common and contiguous discharge manifold. The inlets of the pump sections for a suction stage communicate with a fluid source. Cross-over sections route fluid between stages. Successive pressure stages draw fluid from the cross-over fit to the preceding stage's discharge manifold.Type: ApplicationFiled: May 28, 2002Publication date: December 4, 2003Inventors: Denis Gilbert, Arnoud Struyk
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Patent number: 6612822Abstract: An improved hydraulic motor system, suitable for driving an automotive cooling fan or the like. The system is driven by grade gerotor set and an idle gerotor set which are stacked between a center plate and against a rear wall of a cylindrical cavity in a front face of a manifold. A fluid-tight chamber is established by securing an end frame can around the stacked gerotor sets and against the perimeter of the manifold cavity. Tightness of the seal is controlled by positioning a resilient cover plate against the end frame can from a position opposite the manifold, and adjustably clamping the resilient cover against the manifold until the resilient cover has undergone a predetermined amount of elastic deformation.Type: GrantFiled: July 9, 2001Date of Patent: September 2, 2003Assignee: Valeo Electrical Systems, Inc.Inventors: Jeffrey J. Buschur, John S. Hill, Michael Mientus
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Patent number: 6540493Abstract: The invention is related to a series gear pump for differing output volumes with at least two gear pumps, each gear pump comprises at least two intermeshing displacing elements, a first displacing element and a second displacing element in the form of gears. The individual gear pumps of the series comprise a substantially identical dimensions for the axial interval between the theoretical axes and between the theoretical axes of rotation of the two displacing elements, and a substantially identical gearing width in the form of a substantially identical axial extension of the gearing elements. The individual gear pumps differ from each other at least as regards the size of the tip circle diameter of at least one of the two displacing elements.Type: GrantFiled: August 15, 2000Date of Patent: April 1, 2003Assignee: Vohn Turbo GmbH & Company KGInventor: Tillman Körner
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Publication number: 20030059325Abstract: A multi-lobe, or Roots, blower has two multi-lobe rotors connected for rotation to two drive gears one of which drive gears is connected for rotation to a motor by a quill drive spanning one of the rotors. In sequence, the multi-lobe rotors are preferably within a first chamber of a monolithic housing, the drive gears within a second chamber, and the motor outside the housing. In the quill drive a central shaft is affixed at one end to a shaft of the motor, and at its other end to a hollow tubular shaft containing the central shaft. The tubular shaft affixes at its exterior both one of the two drive gears and one of the two multi-lobe rotors. The quill drive thus transmits torque from the shaft of the motor along the central shaft completely through the first chamber and a multi-lobe rotor therein until, ultimately affixing the tubular shaft and the drive gear within the second chamber, the drive gears and the rotors are caused to be rotated.Type: ApplicationFiled: September 26, 2001Publication date: March 27, 2003Inventor: Craig Adams
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Patent number: 6481991Abstract: Two inner gears are overlapped with each other through a partition wall and are eccentrically arranged at an inner peripheral side of an outer gear, and eccentric directions of both the inner gears are shifted from each other by 180° to the opposite side. By this, loads in an outer diameter direction due to a rise in fuel pressure affect one outer gear from the two inner gears oppositely to each other by 180°, so that an eccentric load is not generated, and sliding resistance of the outer gear to a cylindrical casing becomes small. Further, the number of teeth of the outer gear is made odd, and the number of teeth of the inner gears is made even.Type: GrantFiled: March 20, 2001Date of Patent: November 19, 2002Assignee: Denso CorporationInventors: Masatoshi Takagi, Motoya Ito, Katsuhiko Kusagaya
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Patent number: 6413065Abstract: A modular downhole pump includes a gear module for transferring power to the pump from a sucker rod or a downhole motor and a rotor module. The rotor module includes a pair of counter-rotating, interleaved rotors split into an upper pair and a lower pair which pump fluids in opposite directions within the rotor module. The rotor modules may be configured to increase the pressure capacity or the volume capacity of the pump and may be connected in series to achieve the desired volume and pressure output.Type: GrantFiled: March 30, 1999Date of Patent: July 2, 2002Inventor: Pradeep Dass
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Patent number: 6386836Abstract: A dual gerotor pump is used for an automatic transmission. A dual gerotor pump which is driven by a central drive mechanism has a first chamber which continuously provides transmission fluid to the automatic transmission. The pump also has a second pumping chamber which selectively directs fluid to the automatic transmission when necessary. A valve mechanism is provided to divert fluid from the second pumping chamber back to the second pumping chamber so that it can recirculate thereby decreasing fluid pressure to the automatic transmission when it is not required.Type: GrantFiled: January 20, 2000Date of Patent: May 14, 2002Assignee: Eagle-Picher Industries, Inc.Inventor: Stephen D. Johnson
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Publication number: 20010026767Abstract: Two inner gears are overlapped with each other through a partition wall and are eccentrically arranged at an inner peripheral side of an outer gear, and eccentric directions of both the inner gears are shifted from each other by 180° to the opposite side. By this, loads in an outer diameter direction due to a rise in fuel pressure affect one outer gear from the two inner gears oppositely to each other by 180°, so that an eccentric load is not generated, and sliding resistance of the outer gear to a cylindrical casing becomes small. Further, the number of teeth of the outer gear is made odd, and the number of teeth of the inner gears is made even.Type: ApplicationFiled: March 20, 2001Publication date: October 4, 2001Inventors: Masatoshi Takagi, Motoya Ito, Katsuhiko Kusagaya
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Patent number: 6264451Abstract: In a pump equipment having plural rotary pumps, the respective discharge ports of the rotary pumps are located at the points which are nearly symmetrical with respect to the center axis of the drive shaft to counterbalance each other the respective reaction forces against the drive shaft to be produced by the high pressure at the respective discharge ports. The respective discharge fluid conduits, in case of the first and second pumps, are located at the points which are opposite each other, more preferably, different at an angle of 180 degrees each other, with respect to the center axis of the drive shaft to limit the bending of the drive shaft. As a method for assembling the pump equipment, the peripheral border between respective cylindrical members piled up for constituting the casing is tentatively welded by laser beam at first and, then, all around the peripheral borders are finally welded.Type: GrantFiled: April 21, 1999Date of Patent: July 24, 2001Assignee: Denso CorporationInventors: Takashi Murayama, Takeshi Fuchida, Daizo Oba
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Patent number: 6250278Abstract: A rotary machine in which plural, cylindrical rotors are provided for rotation within partially overlapping cylindrical bores, formed within a machine housing. The rotors are eccentrically mounted for synchronized, same directional rotation, within their respective bores, and each is arranged to alternately provide intake and exhaustion of working gaseous fluids, such that each rotor is continually either admitting or exhausting a working gas. The machine is constructed such that the rotors are cylindrical, each being of internally balanced form. The rotors do not touch each other or any portion of the machine casing at any time, while being positioned so as to define minimal gaps therebetween. A high rotational speed may be developed, thereby obviating the need for seals entirely, and thus further increasing the available speed, and thus the work efficiency of the machine.Type: GrantFiled: June 18, 1998Date of Patent: June 26, 2001Inventor: Dan Mekler
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Patent number: 6093008Abstract: The invention relates to a worn-rive compressor (10) with a main rotor shaft (18) on which are fitted at least one first and one second main rotor (14, 16), each of which meshes with a matching first or second sub-rotor (20, 22) on a rotor layshaft (24). To provide a hard-wearing, economically produced and highly efficient worm-drive compressor (10), the hearings of the rotor main and layshafts (18, 24) are matched to the compressed gas supply in such a way that the loads imposed on the shafts by the pressures produced are absorbed by radially operating bearings (40, 42, 44, 47) near the point at which they arise.Type: GrantFiled: November 19, 1997Date of Patent: July 25, 2000Inventor: Guenter Kirsten
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Patent number: 5755566Abstract: A pump suitable for use with delicate fluids such as food products. The pump includes a casing having an internal cavity that defines a pumping chamber, an inlet and an outlet port, a first and second pumping rotors mounted for rotation in the casing, each pumping rotor including a first set of angularly spaced apart projections and a second set of angularly spaced apart projections. The first and second sets of projections of one rotor are in a condition of mesh with the first and second sets of projections of the other rotor, respectively. This feature allows one rotor to drive the companion rotor, thus eliminating the need of separate drive gears.Type: GrantFiled: August 23, 1996Date of Patent: May 26, 1998Assignee: Kalish Canada Inc.Inventors: Julio Marsillo, Graham L. Lewis
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Patent number: 5549463Abstract: A composite dry vacuum pump of this invention has closed chambers accommodating a pair of screw rotors and a pair of roots rotors respectively mounted coaxially to the front ends of the screw rotors. The roots rotors and the screw rotors are rotated at the same speed in opposite directions by a motor to aspirate fluids from a suction port on one end wall and discharge the fluid through a discharge port on the outer surface of the other end wall. The characteristics of power requirement of the portion of the roots rotors and that of the portion of the screw rotors changes inversely to the suction port pressure variation, therefore the characteristic of the total power requirement of the pump of this invention is almost flat over the all pressure range and the motor having smaller output power can operate the pump according to the present invention.Type: GrantFiled: March 3, 1995Date of Patent: August 27, 1996Assignee: Kashiyama Industry Co., Ltd.Inventor: Osamu Ozawa
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Patent number: 5540569Abstract: Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities. The invention is particularly useful for ink jet printing applications.Type: GrantFiled: January 17, 1995Date of Patent: July 30, 1996Assignee: Micropump, Inc.Inventors: Tim J. Altham, Paul A. Johnson
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Patent number: 5496163Abstract: A gear machine (pump or motor) has two externally meshing gear pairs (21, 22) which are arranged so as to be offset relative to one another and are attached to a drive shaft (31) by a toothing (30), the number of teeth of the toothing (30) being an even-number multiple of the external teeth of the driven toothed wheels (16, 18). The toothing width (b) of the driven toothed wheels (16, 18) on the drive shaft (31) is smaller than their toothed wheel width (B), in particular smaller than one-half the toothed wheel width (B). This improves the mechanical characteristics of the gear machine its operating reliability. The invention can also be used with gear machines with only one gear pair (21a).Type: GrantFiled: July 20, 1994Date of Patent: March 5, 1996Assignee: Robert Bosch GmbHInventors: Klaus Griese, Guido Bredenfeld, Horst Hesse
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Patent number: 5466131Abstract: Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities.Type: GrantFiled: March 22, 1994Date of Patent: November 14, 1995Assignee: Micropump CorporationInventors: Tim J. Altham, Paul A. Johnson
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Patent number: 5378130Abstract: In a tandem type gear pump, the housing body has an inner middle partition wall portion integral with the body and having bearing means. The housing body is formed at the opposite axial end faces thereof with a pair of recesses each shaped like a pair of glasses, with a pair of covers being fixed to the axial end faces of the body to close the recesses. A pair of gear pump units are set in the recesses so as to be rotatable by the bearing means in synchronism with each other. The housing is provided with inlet and outlet port means in communication with the gear pump units.Type: GrantFiled: March 18, 1993Date of Patent: January 3, 1995Assignee: Shimadzu CorporationInventors: Tadasi Ozeki, Shigekazu Kitano, Kyoji Sera
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Patent number: 5364245Abstract: Dry-running twin-shaft vacuum pump (1) with at least one pumping chamber (11, 12, 13), with a rotor pair (4-5, 6-7, 8-9) situated in the pumping chamber and borne by the shafts, and with a drive housing (21); in the pumping of toxic media, to limit the contaminated areas to components that are easy to assemble it is proposed that between the drive housing (21) and the adjoining pumping chamber (13) an intermediate plate be provided, which is traversed by the shafts (2, 3), contains the laterally exiting exhaust duct (52), and is releasable from the wall (17) of the drive housing (21).Type: GrantFiled: June 8, 1993Date of Patent: November 15, 1994Assignee: Leybold AktiengesellschaftInventors: Hartmut Kriehn, Lothar Brenner
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Patent number: 5092191Abstract: A worm shaft machine comprises having a longitudinal direction and composed of a plurality of housing portions located near one another in the longitudinal direction, the housing portions having a substantially rectangular outer contour and being provided with longitudinal openings for receiving a worm, the housing portions being assembled with one another so that they abut against one another in the longitudinal diection, a plurality of tensioning rods which tension the housing portions with one another, a closed frame provided at each end of each of the housing portions and forming a pressing piece, the frames having small sides on which they are horizontally exactly slidingly supported.Type: GrantFiled: October 26, 1990Date of Patent: March 3, 1992Inventor: Josef Blach
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Patent number: 5092751Abstract: The invented split gear mechanism replaces a standard single spur gear used within metering pumps and operates in conjunction with a similar driven split gear mechanism. The invention includes two or more layered gear pairs, each layer being re-indexed at a slightly altered fixed orientation relative to a given index point. The invention is typically used within "precision metering pumps" used, for example, in the textile industry. The invention facilitates uniformity by reducing pulsations generated by existing pumps. A method for reducing pulsations in pumping tasks is also included.Type: GrantFiled: October 26, 1990Date of Patent: March 3, 1992Inventor: Dean C. Viktora
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Patent number: 5046934Abstract: A twin-shaft vacuum pump including a rotor pair mounted for rotation in a pump chamber. The rotor pair together with the chamber wall define a suction side and delivery side of the pump chamber. In order to prevent solid particles suspended in pump fluid from settling in the chamber, the invention provides a flushing gas outlet orifice disposed on the delivery side of the pump chamber and adapted to be connected to a source of flushing gas. The solid particles can thus be held in suspension and conveyed from the pump with the assistance of flushing gas supplied through the orifice.Type: GrantFiled: February 20, 1990Date of Patent: September 10, 1991Assignee: Leybold AktiengesellschaftInventor: Hanns-Peter Berges
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Patent number: 5032068Abstract: The instant invention relates to a displacement-type rotary system steam-turbine engine that among other mainly functions as a displacing-type steam engine. Through the partial utilization of the kinetic energy generated by the impinging steam molecules upon the rotor blades said invention functions additionally similar to a radial flow turbine.Type: GrantFiled: August 16, 1990Date of Patent: July 16, 1991Inventor: Waldemar H. Kurherr
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Patent number: 4943214Abstract: A two-shaft rotary machine for use in a vacuum pump system includes rotors having a specific profile whereby any vibration and noise generated by the machine is minimized and its efficiency is increased. The number of lobes of each rotor is three or more. The tip and root portions of each rotor are defined by circular arcs, respectively, which are made smoothly continuous with each other through an involute curve. The ratio of the diameter of the tip circle to the diameter of the root circle is selected to fall within a range which is given by a specific expression.Type: GrantFiled: December 15, 1989Date of Patent: July 24, 1990Assignee: Ebara CorporationInventors: Yoshihiro Niimura, Ritsuo Kikuta, Katsuaki Usui
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Patent number: 4907954Abstract: This relates to a novel design for lobed pistons for rotary positive displacement pumps. By segmenting the pistons and allowing the pistons segments to cooperate as independent pumps, the present noise and vibration produced by these pumps can be reduced in intensity and smeared in time. The pistons are segmented by rotating one segment with respect to another so that the lobes have angular rotational displacement. The best angular displacements are 45 degrees for two lobed pistons and 30 degrees for threes lobed pistons. As the pistons contrarotate in the pump the angular displacement must be opposite in sense, to allow segment cooperation. Allowing the segmented compression chambers to interact at the outlet, and providing a throttle valve between segments further reduces noise and vibration, giving a far smoother discharge flow and reduced pressure fluctuation. In another embodiment throttle valves are placed at the end of a conventional pistion to reduce noise and even discharge flow.Type: GrantFiled: November 20, 1987Date of Patent: March 13, 1990Assignee: Tomasz SlupskiInventor: Stanislaw Slupski
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Patent number: 4828462Abstract: A system for detecting when the pressure on a bi-directional hydraulic device, such as a motor or a pump, exceeds a predetermined pressure. The device is of the type having two meshing gears mounted to rotate in a housing. Fluid inlet and outlet ports are located in the housing on opposite sides of the meshing gear teeth. A pilot port is located in the housing to detect the fluid pressure between one gear and the housing at a location isolated from the inlet and outlet ports. The sensed pressure is a function of the maximum pressure at the inlet and outlet ports.Type: GrantFiled: December 10, 1987Date of Patent: May 9, 1989Assignee: Dana CorporationInventor: James R. McBurnett
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Patent number: 4776779Abstract: A rotodynamic fluid machine comprising a plurality of separate coaxial cylindrical chambers in each of which a drive rotor is positioned. The drive rotors mesh with corresponding sealing rotors and have blades that are curved in such a manner so that if the rotors are placed in abutting relationship that the blades on one rotor will mate with the contiguous blades of the other rotor and extend around the circumference of the rotor so as to overlap in a circumferential direction.Type: GrantFiled: December 23, 1986Date of Patent: October 11, 1988Assignee: Wassan Pty Ltd.Inventor: Lewis R. Crump
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Patent number: RE42408Abstract: An oil pump for an internal combustion engine includes a pump body with a first gear chamber and a second gear chamber, and a cover mounting to the pump body. The pump also has a check valve and a pressure relief valve in fluid communication with the gear chambers. The oil pump has a supply set of intermeshing involute spur gears in the first gear chamber with nine involute teeth. A return set of intermeshing involute spur gears with the same gear profile as the supply gears is housed in the second gear chamber. Both sets of gears are driven by a common drive shaft so that the pump may be retrofitted to existing engines. The profile of the gears provides for improved pump volume without increasing angular velocity or gear diameter over gears of the prior art. The return gears are deeper than the supply gears to provide an improved supply to return flow ratio.Type: GrantFiled: February 16, 2005Date of Patent: May 31, 2011Assignee: S & S Cycle, Inc.Inventors: James B. Havlik, Brent Glick, Todd Olson