Working Chamber Surface Expressed Mathematically Patents (Class 418/150)
  • Patent number: 10344595
    Abstract: Disclosed is a vane pump comprising a cam ring accommodated in a pump housing, a rotor accommodated rotatably with respect to a rotational shaft in the cam ring, and a plurality of vanes coupled to the rotor to discharge fluid, wherein the cam ring has a ring shaped inner profile varied between a maximum radius (Rmax) and a minimum radius (Rmin) in a circumferential direction with respect to the rotational shaft, and the ring shaped inner profile comprises: a cycloid curve passing through a maximum radius point; a circular arc passing through a minimum radius point; and a tangent line connecting the cycloid curve to the circular arc with a tangential curvature.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: July 9, 2019
    Assignee: MYUNGHWA IND. CO., LTD.
    Inventor: Sang-woo Kim
  • Patent number: 10337509
    Abstract: Provided is an internal gear pump. The shape of any one of a plurality of external teeth and a plurality of internal teeth of the pump is formed on the basis of formulae (1)-(5). r=ro?dr·cos ?,??Formula (1): Px=(ro?dr)+1/4dr{1?cos(2?)},??Formula (2): Py=1/4dr{?2?+sin(2?)},??Formula (3): Qx=Px?r·cos ?,??Formula (4): Qy=Py+r·sin ???Formula (5):.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: July 2, 2019
    Assignee: TOYOOKI KOGYO CO., LTD.
    Inventor: Noritaka Watanabe
  • Patent number: 10060434
    Abstract: In a scroll compressor, breakage of a spiral end portion of a spiral wall (10c, 11c) of a scrolls is prevented. [Solving means] In a scroll compressor including: a fixed scroll (10) including an end plate (10a) and a spiral wall (10c) extending upright from the end plate (10a); an orbiting scroll (11) including an end plate (11a) and a spiral wall (11c) extending upright from the end plate (11a); and a drive shaft (8) configured to transmit a rotational power to the orbiting scroll (11), and configured to compress a compressed fluid by an orbital motion of the orbiting scroll (11), an extending portion (113) which does not come into contact with the spiral wall (10c) of the fixed scroll (10) is provided so as to extend from a spiral end portion (112), which corresponds to a terminal end of a wall surface (compression forming portion (111)) which forms a compression chamber (15) on a spiral wall (11c) of the orbiting scroll (11).
    Type: Grant
    Filed: May 26, 2014
    Date of Patent: August 28, 2018
    Assignee: Valeo Japan Co., Ltd.
    Inventors: Hironobu Deguchi, Kyung-Jae Lee
  • Patent number: 10012231
    Abstract: A claw pump includes: a housing; two rotating shafts which are disposed parallel; a pair of rotors respectively fixed to the two rotating shafts; a rotary drive device driving the pair of rotors; and a suction port and discharge ports formed in a partition wall of the housing. The discharge ports are constituted by a first discharge port and a second discharge port. The first discharge port is formed at a position that communicates with an initial stage compression space formed at an initial stage of a compression stroke in a compression space that is formed by joining a first pocket and a second pocket. The claw pump includes an opening/closing mechanism which opens the first discharge port when a pressure of the initial stage compression space reaches a threshold and closes the first discharge port when the pressure does not reach the threshold.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: July 3, 2018
    Assignee: ANEST IWATA CORPORATION
    Inventor: Ryusuke Muto
  • Patent number: 9926930
    Abstract: A vane pump (1) is disclosed comprising a housing (2) having a stator bore, a rotor (4) being rotatably mounted within said stator bore, and having a number of vanes (5) slidably mounted in said rotor (4) in radial direction of said rotor (4), an inlet (11) and an outlet (12). Such a vane pump should have a good efficiency. To this end said inlet (11) opens in an axial end wall of said stator bore (3) and said outlet (12) is connected to an outflow area formed in a circumferential wall (3) of said stator bore.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: March 27, 2018
    Assignee: Danfoss A/S
    Inventor: Erik Haugaard
  • Patent number: 9856874
    Abstract: A scroll compressor that includes a housing and scroll compressor bodies disposed in the housing. The scroll bodies include a non-orbiting scroll body (also referred to as “fixed”) and a moveable body, where scroll bodies have respective bases and respective scroll ribs that project from the respective bases. The scroll ribs are configured to mutually engage, and the movable scroll body orbits relative to the fixed scroll body for compressing fluid. A pilot ring engages a perimeter surface of the fixed scroll body to limit movement of the fixed scroll body in the radial direction. A simplified holding plate prevents rotation between the pilot ring and the fixed scroll body.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: January 2, 2018
    Assignee: BITZER Kuehlmaschinenbau GmbH
    Inventors: Johnathan P. Roof, Xianghong Wang, Carl F. Stephens, Christopher Allen Wyker
  • Patent number: 9803640
    Abstract: A negative pressure pump includes an electrically insulative casing an electrically conductive rotary shaft and an electrically conductive vane. The casing is formed in a tubular shape, an axial direction one end of which is closed off by a cap body. The rotary shaft is disposed in the casing, is mechanically and electrically connected to an earthed power source, and is rotated by power being transmitted from the power source. The vane is disposed in the casing, is supported at the rotary shaft to freely reciprocate in a direction orthogonal to the rotary shaft, and is electrically connected to the power source via the rotary shaft. The vane rotates integrally with the rotary shaft, and end portions of the vane slide over an inner wall face of the casing. The vane divides the interior of the casing into a plurality of spaces and generates negative pressure.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: October 31, 2017
    Assignee: SANOH INDUSTRIAL CO., LTD.
    Inventor: Nobushi Yamazaki
  • Patent number: 9765775
    Abstract: A vane pump with a pump housing in which a cam ring is constructed or arranged, and wherein a rotor is provided that is mounted in the cam ring so that it can rotate about a rotational axis , wherein the cam ring has an inner contour with a variable radius that varies between a maximum radius and a minimum radius in the circumferential direction about the rotational axis , wherein, in the radial gap between the inner contour and the rotor , a number of lift sections is constructed with pump chambers constructed in these sections, and wherein vane elements are mounted on the rotor , wherein these elements slide against the inner contour of the cam ring and limit the pump chambers in the circumferential direction. According to the invention, the radius of the inner contour varies about the rotational axis according to the function: r=r0+a·sin(n·?), where r0=(rmax+rmin)/2, a =(rmax?rmin)/2, and ?=phase angle of the radius (r) between (rmin) and (rmax) in the direction of rotation of the rotor .
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: September 19, 2017
    Assignee: Hella KGaA Hueck & Co.
    Inventors: Ingo Geue, Theodor Hüser, Dennis Marburg, Udo Schubert, Thomas Valeiras
  • Patent number: 9670778
    Abstract: The invention relates to a rotary piston engine (2) which operates as a pump, condenser or motor for a liquid or gaseous medium. The rotary piston engine (2) has a first gear (4) having a first central axis (I), a second gear (6) arranged opposite the first gear (4) and having a second central axis (II), and a drive shaft (8) having a third central axis (III) and a sliding plane (10, 12) fixedly connected to the drive shaft (8). The first central axis (I) and the second central axis (II) enclose an angle (?3) which is not equal to 180°. The third central axis (III) and at least one central axis (I, II) from the group comprising the first central axis (I) and second central axis (II) enclose an angle (?1, ?2) which is not equal to 0° or 90°. The sliding plane (10, 12) and the central axis (I, II) are perpendicular to each other.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: June 6, 2017
    Assignee: Robert Bosch GmbH
    Inventor: Dieter Amesoeder
  • Patent number: 9574559
    Abstract: Provided is an oil pump rotor capable of improving a volume efficiency and a quietness. When a diameter of a base circle bi of an inner rotor is ? bi; a diameter of a first outer rolling circle Di is ? Di; a diameter of a first inner rolling circle di is ? di; a diameter of a base circle bo of an outer rotor is ? bo; a diameter of a second outer rolling circle Do is ? Do; a diameter of a second inner rolling circle do is ? do; and an eccentricity amount between the inner rotor and the outer rotor is e, ? bi=n·(? Di+? di) and ? bo=(n+1)·(? Do+? do) hold; either ? Di+? di=2e or ? Do+? do=2e holds; and ? Do>? Di and ? di>? do hold. When a clearance between the inner rotor and the outer rotor is t, 0.3?((? Do+? do)?(? Di+? di))·(n+1)/t?0.6 holds, provided that ? Di+? di=2e; or 0.3?((? Do+? do)?(? Di+? di))·n/t?0.6 holds, provided that ? Do+? do=2e.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: February 21, 2017
    Assignee: DIAMET CORPORATION
    Inventors: Atsushi Shiotani, Eiichiro Niizuma
  • Patent number: 9562531
    Abstract: A negative pressure pump has: a housing; a rotating shaft having a shaft portion, and a supporting portion; a vane that is supported at the supporting portion so as to freely move reciprocally in a direction orthogonal to the rotating shaft, and that rotates integrally with the rotating shaft, and whose end portions slide on an inner wall surface, and that sections an interior of the housing into plural spaces; an intake portion that is formed in the housing; a discharging portion that is formed further toward a vane rotating direction downstream side than the intake portion; and a concave portion that is formed in a bottom surface between the discharging portion and a curved surface in a vane rotating direction, and that communicates with a circular hole, and guides the lubricant, that is moved by the vane, to the circular hole.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: February 7, 2017
    Assignee: SANOH INDUSTRIAL CO., LTD.
    Inventor: Nobushi Yamazaki
  • Patent number: 9541085
    Abstract: An internal gear pump includes a pump rotor (4) in which a meshing point between an inner rotor (2) having n teeth and an outer rotor (3) having (n+1) teeth is located rearward, in a rotational direction of the rotor, relative to an eccentric axis (CL) along which a center (OI) of the inner rotor and a center (OO) of the outer rotor are disposed. A tooth-surface curve of the outer rotor (3) near a meshing section thereof is formed by duplicating thereto a tooth-surface shape of the inner rotor (2) near a meshing section thereof.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: January 10, 2017
    Assignee: SUMITOMO ELECTRIC SINTERED ALLOY, LTD.
    Inventor: Masato Uozumi
  • Patent number: 9518580
    Abstract: A scroll type fluid machine for improving compression efficiency while preventing contact between wrap sections of opposed scrolls, includes a first scroll member provided with a wrap section of a spiral shape on an end plate, a second scroll member disposed at a position opposed to the first scroll member and provided with a wrap section of a spiral shape on an end plate, cooling fins arranged on a back side surface of the end plate of at least one of the first scroll member and the second scroll member, and projected sections arranged on the wrap section of at least one of the first scroll member and the second scroll member, in which a difference of thicknesses in the radial direction of the wrap section at a distal end and a base end of the projected sections is changed depending on a position in a peripheral direction.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: December 13, 2016
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventor: Toshikazu Harashima
  • Patent number: 9464525
    Abstract: An internal gear pump in which an inner rotor and an outer rotor are arranged in a rotor housing chamber. A deepest meshing section is located in the vicinity on a line connecting a center of the inner rotor and a center of the outer rotor. A center of the rotor housing chamber is offset, from a position in which the center and the center of the outer rotor coincide with each other, to the deepest meshing section side by an amount smaller than a tip clearance, which is a gap between the tooth tip of the inner rotor and the tooth tip of the outer rotor in the vicinity of a seal land between a terminal end side of an intake port and a start end side of a discharge port.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: October 11, 2016
    Assignee: YAMADA MANUFACTURING CO., LTD.
    Inventors: Kenichi Fujiki, Masato Izutsu
  • Patent number: 9383235
    Abstract: Systems and methods for determining a flow rate or volume of fluid. The system includes a positive displacement meter including a plurality of non-contact sensors and gears configured to rotate in response to fluid flow through the meter. The gears may include detectable areas that may be sensed by the plurality of non-contact sensors to determine a rotational direction of the gears. The plurality of non-contact sensors may also be configured to generate respective detection signals indicative of a rotation state of the gears. The controller may be configured to receive the detection signals, determine a current rotation state, and increment a rotational count based on the changes in the current rotation state. The controller may use the rotational count to determine a flow rate or volume of fluid.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: July 5, 2016
    Assignee: Ecolab USA Inc.
    Inventors: Eugene Tokhtuev, Anatoly Skirda, Christopher J. Owen, William M. Christensen, Paul S. Schilling
  • Patent number: 9273688
    Abstract: A tooth profile of an inner rotor 2 is formed by an envelope of a group of circular arcs of a locus circle C having a center on a trochoidal curve TC. The envelope of the group of circular arcs is formed by rolling a rolling circle having a predetermined diameter along a base circle without slipping and drawing the trochoidal curve TC based on a point distant from the center of the rolling circle by a distance equivalent to an amount of eccentricity between the two rotors. A diameter d2 of the locus circle C is constant until one point between an addendum point and a dedendum point of the inner rotor and changes from the one point such that a diameter d2B at the dedendum point becomes larger than a diameter d2T at the addendum point of the inner rotor.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: March 1, 2016
    Assignee: SUMITOMO ELECTRIC SINTERED ALLOY, LTD.
    Inventors: Harumitsu Sasaki, Kentaro Yoshida
  • Patent number: 9091263
    Abstract: In an internal gear pump 9, a diameter of a base circle is set to A mm, a radius of a rolling circle is set to b mm, a diameter of a locus circle is set to C mm, and an amount of eccentricity is set to e mm. A trochoidal curve T is drawn by rolling the rolling circle along the base circle without slipping and by using a locus of a fixed point distant from a center of the rolling circle by e. A tooth profile of an inner rotor 2 having n teeth is formed based on an envelope of a group of the locus circles each having a center on the trochoidal curve T. A pump rotor 1 is formed by combining the inner rotor with an outer rotor having (n+1) teeth. A tooth-profile curve of the inner rotor satisfies the following expression (1). Because K<1 is satisfied, cusps s are not formed at opposite edges of each addendum of the inner rotor 2.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: July 28, 2015
    Assignee: SUMITOMO ELECTRIC SINTERED ALLOY, LTD.
    Inventors: Masato Uozumi, Toshiyuki Kosuge
  • Patent number: 9057632
    Abstract: A water meter of the present invention may accurately measure a flow rate and reduce power consumption. The water meter includes a body including an inlet unit and an outlet unit, an impeller unit provided to rotate due to a fluid flowing in the body, a cover member that covers one side of the impeller unit and includes a guide groove formed therein, and sensors that are provided on one side and the other side of the cover member and are spaced apart from each other to face each other. The impeller unit includes blades interfering with the fluid, a shaft forming a rotational center of the blades, and a cut-off unit that extends from one side of the plurality of blades to be inserted into the guide groove, and selectively cuts off signal transmission between the plurality of sensors.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: June 16, 2015
    Assignee: ONE-TL CO., LTD.
    Inventors: Jae Sam Park, Byeong Hak Kang, Hun Cha
  • Patent number: 9004889
    Abstract: An internal gear pump includes an inner rotor having n teeth and an outer rotor having (n+1) teeth. A tooth profile of the inner rotor is an envelope of a group of locus circles (13) each having a diameter C and having a center on a trochoidal curve (T), the trochoidal curve being drawn along a locus of a fixation point, which is located distant from a center of a rolling circle (12) by e, when the rolling circle (12) rolls along a base circle (11) without sliding. A tooth profile of the outer rotor is an envelope of a group of tooth-profile curves of a formation inner rotor, the envelope being obtained by first drawing the formation inner rotor in which a diameter of the locus circle (13) is equal to C? determined from expression (C?t), revolving a center (OI) of the formation inner rotor by one lap along a circle (S) having a diameter (2e) and centered on a center (OO) of the outer rotor, and rotating the formation inner rotor 1/n times during the revolution.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: April 14, 2015
    Assignee: Sumitomo Electric Sintered Alloy Ltd.
    Inventors: Masato Uozumi, Toshiyuki Kosuge
  • Patent number: 8985983
    Abstract: A blade-type fluid transmission device includes a rotor eccentrically located in the room of a stator and the outer periphery of the rotor is tangent to the inner periphery of the room. At least one blade is pivotably connected to stator and movably inserted in at least one slot of the rotor. The distal end of the at least one blade is in contact with the inner periphery of the room so as to form a space for receiving fluid between the outer periphery of the rotor and the inner periphery of the room. The contact between the at least one blade and the inner periphery of the room increases the efficiency for transmitting fluid which enters into the stator from an inlet and leaves from the stator from an outlet.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: March 24, 2015
    Inventors: Gene-Huang Yang, Shun-Ji Yang
  • Publication number: 20150078946
    Abstract: A vane pump with a pump housing in which a cam ring is constructed or arranged, and wherein a rotor is provided that is mounted in the cam ring so that it can rotate about a rotational axis , wherein the cam ring has an inner contour with a variable radius that varies between a maximum radius and a minimum radius in the circumferential direction about the rotational axis , wherein, in the radial gap between the inner contour and the rotor , a number of lift sections is constructed with pump chambers constructed in these sections, and wherein vane elements are mounted on the rotor , wherein these elements slide against the inner contour of the cam ring and limit the pump chambers in the circumferential direction. According to the invention, the radius of the inner contour varies about the rotational axis according to the function: r=r0+a·sin(n·?), where r0=(rmax+rmin)/2, a =(rmax?rmin)/2, and ?=phase angle of the radius (r) between (rmin) and (rmax) in the direction of rotation of the rotor .
    Type: Application
    Filed: September 8, 2014
    Publication date: March 19, 2015
    Inventors: Ingo Geue, Theodor Hüser, Dennis Marburg, Udo Schubert
  • Patent number: 8979517
    Abstract: A rotary compressor, used e.g. in an air conditioner, includes a compressing unit having an end plate that closes an end portion of an annular cylinder. The end plate includes a groove portion accommodating a discharge valve portion having a reed valve type discharge valve and a discharge-valve limiter. The discharge valve portion is attached to the groove portion with a rivet. The groove portion has a rivet-side enlarged diameter portion formed into a semicircular step shape, and a diameter of the rivet-side enlarged diameter portion other than a bottom side thereof is larger than a diameter of the bottom side. This prevents a punch P that swages the rivet from interfering with the groove portion when attaching the discharge valve portion to the groove portion with the rivet.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: March 17, 2015
    Assignee: Fujitsu General Limited
    Inventors: Takayuki Omura, Taku Morishita
  • Patent number: 8974206
    Abstract: A metering pump with a special-shaped cavity comprising a housing, a rotor and two cover plates. The housing is a cylinder with a special-shaped surface inner cavity formed by combining two circular arc surfaces with two non-circular arc surfaces and a planar surface, an inlet and an outlet. The rotor comprises a rotor body and two pairs of combined sliding plates. The housing is matched with the cover plates for constituting a sealed cavity. When the rotor rotates, the non-circular arc surface of the special-shaped surface inner cavity can enable the two pairs of the combined sliding plates to slide in a cross manner so as to suck in fluid from the inlet and press out the fluid from the outlet. When the rotor rotates one cycle, four standard volumes are formed in a cavity body and the equal quantity of the fluid flows by the cavity body.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: March 10, 2015
    Assignee: Zhejiang University
    Inventors: Yang Lu, Hua Lei
  • Patent number: 8876504
    Abstract: An object is to meet the demands for increasing the number of teeth of a rotor in an internal gear pump while maintaining a theoretical discharge amount by using an equivalent body configuration so as to enhance the pump performance relating to discharge pulsation due to the increased number of teeth. In a pump rotor 1 formed by combining of an inner rotor (2) having N teeth and an outer rotor (3) having (N+1) teeth and disposing the rotors eccentrically relative to each other, the relational expression ?Dmax<1.7e·sin(?/180)/sin {?/(180·N)} is satisfied, ?Dmax being a maximum value of a working pitch diameter of the inner rotor (2) and the outer rotor (3), and a working position (G) of the inner rotor (2) and the outer rotor (3) is always located rearward of an eccentric axis (CL) in a rotating direction of the rotor.
    Type: Grant
    Filed: November 2, 2010
    Date of Patent: November 4, 2014
    Assignee: Sumitomo Electric Sintered Alloy, Ltd.
    Inventors: Masato Uozumi, Harumitsu Sasaki, Kentaro Yoshida
  • Patent number: 8870556
    Abstract: An oil pump is increased to inhibit noise generation and durability is also improved. The oil pump includes a pump body, an inner rotor having outer teeth, and an outer rotor having inner teeth. A maximum partition portion is formed between a trailing end side of an intake port and a leading end side of a discharge port in a rotor chamber of the pump body. Among cells constituted by the outer teeth of the inner rotor and the inner teeth of the outer rotor, a central cell positioned in the location of the maximum partition portion and adjacent cells positioned before and after the central cell in the direction of rotation are sealed by mutual contact of the outer teeth and the inner teeth. The outer teeth and the inner teeth constituting cells other than the central cell and adjacent cells are not in contact with each other.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: October 28, 2014
    Assignee: Yamada Manufacturing Co., Ltd.
    Inventors: Kenichi Fujiki, Masato Izutsu
  • Patent number: 8858202
    Abstract: The rotary diaphragm pump has a flexible, resilient diaphragm band surrounding an elliptical frame within a case having four chambers surrounding an elliptical core. An articulating mechanism has a plurality of wheels traveling along the elliptical edges of the frame. The mechanism extends and retracts as the wheels move from maximum extension along the major axis of their elliptical tracks to minimum extension at the minor axis of their tracks. This mechanism drives a pair of actuator rollers along the inner surface of the diaphragm, periodically forcing the diaphragm into the surrounding chambers to produce the pumping action. Each chamber has an inlet port and an outlet port. The various ports may be interconnected to provide one or more multi-stage pumps in combination with one or more single-stage pumps, as desired. Two or more pumps may be joined in tandem to provide greater capacity from a single drive shaft.
    Type: Grant
    Filed: August 8, 2012
    Date of Patent: October 14, 2014
    Assignee: Kuwait University
    Inventor: Osama M. Al-Hawaj
  • Patent number: 8827668
    Abstract: The present invention deals with the analytical definition of a tooth profile for rotors used in gear pumps. The purpose is to obtain a pump characterized by noiseless operation, minimization of vibrations and pressure overoscillations generated in operating conditions at the beginning and end of life, and high specific displacement, in such a way to increase the delivery of the pump in given volume conditions. This profile is characterized by an active profile of the tooth flanks with involute stub-tooth with transverse contact ratio (?t) comprised in the range from 0.4 to 0.45, helical teeth with helical contact ratio (??) comprised in the range from 0.6 to 0.85, circular inactive tooth bottom and top profiles, with center (Of, Ot) and radius (rf, rt) defined by a non-dimensional parameter ? in the range from 1.1 to 1.6.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: September 9, 2014
    Assignee: Marzocchi Pompe S.p.A.
    Inventor: Catania Giuseppe
  • Patent number: 8784087
    Abstract: A roots type fluid machine includes suction and discharge ports, rotary shafts and a pair of rotors. The rotor has a number n of lobe and valley portions with apex and bottom ends. The lobe portions are located on imaginary lines extending radially from an axis of the rotary shaft. The outer surface of each one of the rotors is generated by rotating an outline of the rotor including an arc and involute and envelope curves around and moving the outline in the direction of the axis. The arc has a radius R and a center located on the imaginary line. The involute curve is formed by an imaginary base circle having a radius r and a center located on the axis. The envelope curve is formed by an arc having a radius R. The number n is four or more. A torsional angle ? is over 360/n degrees.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: July 22, 2014
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Takayuki Hirano, Kazuho Yamada, Masato Sowa, Toshiro Fujii, Tsutomu Nasuda, Katsutoshi Shiromaru, Fumihiro Suzuki
  • Patent number: 8747090
    Abstract: A rotary compressor includes: a driving element which is provided inside a sealed container; and a rotary compression element which is provided inside the sealed container so as to be located below the driving element. A refrigerant discharge pipe is inserted from a side surface of the sealed container above the driving element into the sealed container, and is opened in the horizontal direction. A refrigerant compressed by the rotary compression element is discharged from a discharge hole into the sealed container, and is discharged from the refrigerant discharge pipe to the outside of the sealed container. The position of the discharge hole is set to a position below an area A1 on the opposite side of the opening direction of the refrigerant discharge pipe from a line L1 passing an opening surface of the refrigerant discharge pipe and perpendicular to the opening direction of the refrigerant discharge pipe.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: June 10, 2014
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Kazuya Sato, Takashi Sato
  • Patent number: 8721310
    Abstract: A rotary motor for compressible media, containing at least one impellor and at least one stator mounted between two mutually coupled and concurrently mounted bearing plates, adjusted for a mounting of double sided led out driving shaft of the impellor on which is mounted a rotary piston mounted in a chamber of the stator equipped with sealing lids, wherein the rotary piston with elliptical crosscut is mounted into symmetrically shaped triangular chamber equipped with rounded peaks, when each of them is equipped with at least one port for an entry and an exit of the compressible media, in way that a lengthwise axis (op) of the rotary piston which is identical to the driving shaft axis is due to reach of simultaneous circular movement of the stator in contra direction to the rotary piston rotating namely at parallel advance of all points of the stator along the circle with eccentricity radius (e) and is moved with regard to a lengthwise axis (os) of the chamber of the stator of the value of an eccentricity (e),
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: May 13, 2014
    Inventor: Jiri Dvorak
  • Patent number: 8714951
    Abstract: A rotary chambered fluid energy-transfer device includes a housing with a central portion having a bore formed therein and an end plate forming an arcuate inlet passage, with a radial height and a circumferential extent. The device also includes an outer rotor rotatable in the central portion bore with a female gear profile formed in a radial portion defining a plurality of roots and an inner rotor with a male gear profile defining a plurality of lobes in operative engagement with the outer rotor. A minimum radial distance between an outer rotor root and a corresponding inner rotor lobe define a duct end face proximate the end plate, wherein the duct end face has a radial height substantially equivalent to the inlet passage radial height at a leading edge of the inlet passage.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: May 6, 2014
    Assignee: Ener-G-Rotors, Inc.
    Inventor: George A. Yarr
  • Publication number: 20140112816
    Abstract: In an internal gear pump 9, a diameter of a base circle is set to A mm, a radius of a rolling circle is set to b mm, a diameter of a locus circle is set to C mm, and an amount of eccentricity is set to e mm. A trochoidal curve T is drawn by rolling the rolling circle along the base circle without slipping and by using a locus of a fixed point distant from a center of the rolling circle by e. A tooth profile of an inner rotor 2 having n teeth is formed based on an envelope of a group of the locus circles each having a center on the trochoidal curve T. A pump rotor 1 is formed by combining the inner rotor with an outer rotor having (n+1) teeth. A tooth-profile curve of the inner rotor satisfies the following expression (1). Because K<1 is satisfied, cusps s are not formed at opposite edges of each addendum of the inner rotor 2.
    Type: Application
    Filed: December 26, 2012
    Publication date: April 24, 2014
    Inventors: Masato Uozumi, Toshiyuki Kosuge
  • Patent number: 8702409
    Abstract: Screw compressor (1) comprising: a male (2) and a female rotor (3) rotating respectively around a first axis (01) and second axis (02) of rotation, said rotors (2;3) showing, in cross section, meshing lobes (4) and valleys (6) and having profiles generated by enveloping a rack profile (p) including a first curve (z1) of the rack profile (p) extending between a first point (H) and a second point (Q) in a Cartesian reference frame (X, Y) and having a convexity in the positive direction of the axis of abscissa (X), said first point (H) lying on the axis of abscissa (X) at a distance from an origin (0) of the Cartesian reference frame (X, Y) equal to an addendum (hi) of the male rotor (2).
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: April 22, 2014
    Assignee: Gardner Denver S.R.L.
    Inventors: Paolo Cavatorta, Umberto Tomei
  • Patent number: 8668480
    Abstract: A vane liner for use in a vane pump has a vane liner body defining an inner bore for providing a cam surface in a vane pump. The cam surface has a suction opening formed through the body at one circumferential extent, and a discharge opening through the body at a distinct circumferential extent. A pre-pressurization opening extends through the body at a location upstream of an upstream end of the discharge opening, but spaced by at least 90 degrees from a downstream end of the suction opening. A vane pump incorporating the above-discussed liner is also claimed. Further, a vane pump is also disclosed and claimed having the spacing from the downstream end of the suction opening at least X degrees wherein X equals 360 divided by N, N being the number of vanes in the vane pump.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: March 11, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Paul G. Dennis, Timothy J. Franckowiak, David W. Borgetti
  • Patent number: 8632323
    Abstract: A gear pump rotor is provided including a combination of an inner rotor and an outer rotor whose numbers of teeth are different by one, and the discharge amount of the pump is increased by an increase of the tooth depth. At least one of an addendum curve and a dedendum curve of an inner rotor is formed by a locus of one point on formation circles that satisfy moving conditions that the formation circles move from moving start points to moving end points while changing the distances from an inner rotor center to the centers of the formation circles. The centers of the formation circles move by a distance in the radial direction of a base circle, and the formation circles rotate by an angle at a constant angular velocity in the same directions of the moving directions of the formation circles.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: January 21, 2014
    Assignee: Sumitomo Electric Sintered Alloy, Ltd.
    Inventors: Masato Uozumi, Harumitsu Sasaki, Kentaro Yoshida, Yuichirou Egami
  • Patent number: 8602758
    Abstract: An indexing system for a rotor assembly where the indexing system can regulate the rotational location of drive rotors that are configured to rotate about a shaft in one form.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: December 10, 2013
    Assignee: Exponential Technologies, Inc.
    Inventors: Alejandro Juan, Curtis Patterson, Kristjan Gottfried, Soheil Farshchian
  • Patent number: 8602760
    Abstract: A vane compressor according to the present invention, including a cylinder which is approximately cylindrical and whose both ends located in an axial direction are open, a cylinder head and a frame which close both the ends of the cylinder, a rotor shaft which includes a rotor part being cylindrical and rotating in the cylinder and a shaft part transmitting torque to the rotor part, and a vane which is installed in the rotor part and whose tip portion has the R-shape facing outward, performs the compression operation in the state where the normal to the R-shape of the tip portion of the vane and the normal to the inner surface of the cylinder are always approximately coincident with each other.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: December 10, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideaki Maeyama, Shinichi Takahashi, Shin Sekiya, Tetsuhide Yokoyama, Hideto Nakao, Tatsuya Sasaki, Hirotsugu Hayashi
  • Patent number: 8579617
    Abstract: An oil pump rotor includes an inner rotor having (n) external teeth, an outer rotor having (n+1) internal teeth, and a casing forming a suction port and a discharge port for drawing/discharging fluid. In operation, fluid is drawn/discharged according to volume changes of cells formed between tooth faces. A tooth profile based on a mathematical curve has a tooth addendum circle A1 with a radius RA1 and a tooth root curve A2 with a radius RA2, a circle D1 has a radius RD1 satisfying Formula (1), and a circle D2 has a radius RD2 satisfying both Formulas (2) and (3): RA1>RD1>RA2 ??Formula (1) RA1>RD2>RA2 ??Formula (2) RD1?RD2 ??Formula (3) A tooth profile of the external teeth includes a modification either, in a radially outer direction, on the outer side of the circle D1 or, in a radially inner direction, on the inner side of the circle D2.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: November 12, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Hisashi Ono, Koji Nunami
  • Patent number: 8556607
    Abstract: A screw rotor is for use in a screw pump that pumps fluid by rotation of a pair of screw rotors engaged with each other in a rotor housing. The screw rotor includes a multiple-thread portion for pump suction side and a single-thread portion for pump discharge side. The screw rotor is formed so that the tooth profile of the multiple-thread portion is connected to the tooth profile of the single-thread portion through a boundary plane that is perpendicular to the rotation axis of the screw rotor. The first curved portion coincides with the third curved portion in the boundary plane.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: October 15, 2013
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Yuya Izawa, Shinya Yamamoto, Masahiro Inagaki, Makoto Yoshikawa
  • Patent number: 8539931
    Abstract: A rotary internal combustion diesel engine (46) comprising: a posterior plate (78), an intermediate plate (80), and an anterior plate (82); a rotor-housing unit (46) on each side of the intermediate plate (80), each containing a yousroid chamber (48), and a 2-apex rotor (56) containing an aperture (58). The chamber (48) wall contains an intake valve (68), an exhaust valve (70), and a fuel supply device (72); in gasoline embodiments, an ignition device (76) is added; compressed air/gas and hydraulic embodiments, require an input port (74) and an output port (70a). A shaft (52) rotatably mounted, extends through the housing, having essentially rectangular segments (54) within the chambers (48). There are seals (not shown) on the rotor apices (60, 62) and on the anterior (82) intermediate (80), and posterior plate (78).
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: September 24, 2013
    Inventor: Yousry Kamel Hanna
  • Patent number: 8517701
    Abstract: A multistage vacuum pump has a pair of rotors disposed in each of pump chambers connected in stages. As the rotors rotate while intermeshing, a suctioned gas is compressed and discharged, angles of the rotors are adjusted so that a phase angle ?? of the rotors of adjacent pump chambers relative to a rotation angle C of the rotors during a single cycle of the pump chambers from intake to discharge and the number of stages S of the rotors satisfies ???C/S. When a rotor angle is ?1, an mth stage rotor angle is ?m, and an nth stage rotor angle is ?n in order from an upstream side of a gas flow direction, relationships of ?1<?m??n and ?1<?n, where n and m are natural numbers and n>m, are satisfied.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: August 27, 2013
    Assignee: Anest Iwata Corporation
    Inventor: Shiro Tanigawa
  • Patent number: 8517706
    Abstract: The present invention is an apparatus that includes a chamber rotor with a chamber and an extension rotor with an extension. The rotors are housed in a rotor case. A pressure cavity is at least transiently formed by the extension rotor and the chamber rotor. The present invention also includes a compressor that includes a chamber rotor with a chamber and an extension rotor with an extension where the extension is adapted to be received in the chamber when the rotors are synchronously rotated. The compressor also includes a power input shaft attached to the extension rotor and a gear assembly attached to the rotors that is adapted to insure the synchronous rotation of the rotors. A rotor case houses the rotors and has an intake port and an exhaust port. The present invention also includes an engine that is similar to the compressor and includes a spark plug. Methods of compressing, pumping and generating electricity and mechanical power are also part of the present invention.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: August 27, 2013
    Inventor: Jerome R. Lurtz
  • Patent number: 8485805
    Abstract: A rotary compressor is provided. A suction hole is formed through a middle plate of the compressor to distribute refrigerant into both upper and lower cylinders. Coupling bolts having an appropriate length couple the cylinders to the middle plate. The length of the coupling bolts may be defined such that deformation of vane slots of the cylinders due to coupling of the cylinders may be minimized or eliminated, and friction loss and leakage loss between the vane and the vane slot may be reduced, thus improving compressor function.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: July 16, 2013
    Assignee: LG Electronics Inc.
    Inventors: Minchul Yong, Yunhi Lee, Yoonsung Choi
  • Patent number: 8425212
    Abstract: Flowmeter with a pair of helical gears using an oval pitch curve as a reference rack tooth profile. The tooth height ratio of the reference rack tooth profile is ?/4. The reference rack tooth profile is an oval pitch curve of two or less leaves. The moving radius of the oval pitch curve is expressed by ?=a/(1?b cos n?), where ? is a moving radius which is a distance between the center of rotation and the oval pitch curve, “a” is a similarity factor, “b” is a degree of flatness, n (n?2) is the number of leaves, and ? is an argument. The tooth height ratio is h=a/(1?b)?g0, where g0 is a distance between poles of the oval pitch curve and pitch line, wherein g0=a cos ?0/(1?b cos n?0). Values for the similarity factor “a”, degree of flatness “b”, and distance g0 are determined so that the tooth height ratio may be ?m/4.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: April 23, 2013
    Assignee: Oval Corporation
    Inventors: Seigo Ono, Katsuichi Uchida
  • Patent number: 8360762
    Abstract: An oil pump rotor includes an inner rotor formed with n (n: a natural number) external teeth, and an outer rotor formed with n+1 internal teeth which are in meshing engagement with each of the external teeth. And the oil pump rotor is used in an oil pump that includes a casing having a suction port for drawing in fluid and a discharge port for discharging fluid and conveys the fluid by drawing in and discharging the fluid due to changes in volumes of cells formed between surfaces of the internal teeth and surfaces of the external teeth during rotations of the rotors under meshing engagement therebetween.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: January 29, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Koji Nunami, Hisashi Ono
  • Patent number: 8323011
    Abstract: A method of manufacturing a rotor to be used in a dual-rotor lobe pump system for pumping a material at a periodic rate is provided. The method includes selecting a desired periodic flow rate for the material, selecting a number of lobes for the rotor, and selecting either a thickness of the rotor or a spacing between the dual-rotors' axes of rotation in the lobe pump. The method also includes determining the profile for the rotor based on the desired periodic flow rate, so that when the rotor is operated within the dual-rotor lobe pump system, the material can be pumped at substantially the desired periodic flow rate. In another embodiment of the invention, a lobe pump rotor profile is formed by the method described above.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: December 4, 2012
    Assignee: The Regents of the University of California
    Inventors: Daniel C. H. Yang, Shih-Hsi Tong
  • Patent number: 8308460
    Abstract: A scroll compressor includes a fixed scroll having a fixed wrap, and an orbiting scroll having an orbiting wrap engaged with the fixed wrap to define a first compression chamber between an inner surface of the fixed wrap and an outer surface of the orbiting wrap, and to define a second compression chamber between an inner surface of the orbiting wrap and an outer surface of the fixed wrap. A rotation shaft is provided with an eccentric portion at one end thereof to drive the orbiting scroll. A protruding portion protrudes inwardly from an inner end of the fixed wrap, and contacts the orbiting wrap. A distance between a center of the eccentric portion and a tangent line at a contact point between the protruding portion and the orbiting wrap at an end of the first compression chamber is smaller than a radius of the eccentric portion.
    Type: Grant
    Filed: February 16, 2012
    Date of Patent: November 13, 2012
    Assignee: LG Electronics Inc.
    Inventors: Sanghun Seong, Cheolhwan Kim, Byeongchul Lee, Samchul Ha
  • Patent number: 8308459
    Abstract: A Moineau pump or Moineau compressor includes a conically designed inner (4) and a conically designed outer (8) element, whose longitudinal axes (X1, X2) run at an angle to one another and intersect at a point. The pump or compressor has at least two sections (2a, 2b, 2c, 2d) in the axial direction. A part (4b) of the inner element (4) located in a second section (2b) is arranged rotated with respect to a part (4a) of the inner element located in a first section (2a) about the longitudinal axis (X1) of the inner element (4). A part (8b) of the outer element (8) located in the second section (2b) is arranged rotated with respect to an other part (8a) of the outer element (8) located in the first section (2a) about the longitudinal axis (X2) of the outer element (8).
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: November 13, 2012
    Assignee: Grundfos Management a/s
    Inventors: Helge Grann, Sebastien D'Antonio
  • Patent number: 8282371
    Abstract: A screw pump includes a casing including a main accommodating bore and plural sub accommodating bores, a main rotor adapted to be rotatably accommodated in the main accommodating bore, and plural sub rotors adapted to be respectively rotatably accommodated in the sub accommodating bores. Each sub rotor is adapted to engage the main rotor. A cross sectional shape of a flank surface of the main rotor, which is taken in a direction perpendicular to an axial direction of the main rotor, is formed along an epitrochoid traced by an edge of the sub rotor not to include an undercut shape. Further, a cross sectional shape of a flank surface of each sub rotor, which is taken in a direction perpendicular to an axial direction of the sub rotor, is formed along an epitrochoid traced by an edge of the main rotor not to include an undercut shape.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: October 9, 2012
    Assignee: Advics Co., Ltd.
    Inventor: Koichi Hashida
  • Patent number: 8277207
    Abstract: A two-stage screw compressor has a low-pressure stage screw compressor and a high-pressure stage screw compressor integrally constructed. Compression space is formed by a male rotor and a female rotor, and operation gas is fed for compression to the compression space. A method of supplying lubrication oil prevents degradation of volumetric efficiency caused by return of lubrication oil, coming from a bearing and a shaft sealing device, to the low-pressure stage screw compressor. As a result, refrigeration capacity is improved and the amount of the lubrication oil is reduced.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: October 2, 2012
    Assignee: Mayekawa Mfg. Co., Ltd.
    Inventors: Takayuki Kishi, Kazuya Yamada, Toshiyuki Sakaguchi, Tomoo Takenoshita