Bypass Or Relief Valve Controls Venting By Movable Pump Chamber Part Patents (Class 417/283)
  • Patent number: 11397034
    Abstract: A variable speed compressor includes a housing assembly having a suction port and an inlet port, a motor disposed within the housing assembly, and at least one rotatable element mounted within the housing assembly. The at least one rotatable element is driven by the motor about an axis of rotation. The variable speed compression additionally includes an unloading system having at least one valve. The unloading system is selectively operable to supplement an unloading of the variable speed compressor defined by an operational speed of the variable speed compressor.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: July 26, 2022
    Assignee: CARRIER CORPORATION
    Inventor: Brandon Schwoeppe
  • Patent number: 11333148
    Abstract: A screw compressor according to an embodiment includes a rotor casing, a pair of screw rotors disposed in the rotor casing and engaging with each other, and a movable portion disposed so as to be movable in a rotor shaft direction of the pair of screw rotors. The movable portion includes liquefied liquid supply ports capable of supplying a liquefied liquid of a compressed gas toward tooth groove spaces formed by the pair of screw rotors.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: May 17, 2022
    Assignee: MAYEKAWA MFG. CO., LTD.
    Inventors: Yoshifusa Kubota, Takayuki Kishi, Keiji Kitahara
  • Patent number: 11306715
    Abstract: A screw-spindle pump includes: a first (drive) screw spindle and a second (running) screw spindle that runs oppositely with respect to the first screw spindle; and a pump housing configured to receive the first and second screw spindles. The first and second screw spindles form, together with at least the pump housing, delivery chambers, which move from a suction side of the pump to a pressure side of the pump due to a rotation of the first and second screw spindles. The pump housing has a first abutment insert for the first screw spindle and a second abutment insert for the second screw spindle, and at least one of the first and second abutment inserts is set angled with respect to a first plane of the pump, to counteract operationally induced crossing of the first and second screw spindles.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: April 19, 2022
    Assignee: Vitesco Technologies GmbH
    Inventors: Johannes Deichmann, Tim Gonnermann, Marc Völker
  • Patent number: 10724519
    Abstract: A containment assembly for a pump provided with at least one pumping group and with 5 at least one power transmission system to such a pumping group. The containment assembly includes a substantially cylindrical containment vessel provided with an opening at one of the ends thereof, configured to at least 10 partially enclose the pumping group and the respective power transmission system. The containment assembly also includes at least one closure plate, sealably coupled with the containment vessel at the open end thereof and configured to hermetically enclose, in 15 cooperation with such a containment vessel, the pumping group and the respective power transmission system. On a predetermined contact portion between the containment vessel and the closure plate at least one wave spring is provided, configured to keep the pumping group 20 dynamically under compression by means of the closure plate.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 28, 2020
    Assignee: FLUID-O-TECH S.R.L.
    Inventors: Vittorio Andreis, Gabriele Sorrentino
  • Patent number: 10612543
    Abstract: A geared positive-displacement machine (10), comprising a housing (11) provided with a suction port and with a discharge port, a pair of gearwheels (14, 15) that are housed and supported by respective shafts (16, 18) for the rotation in a space inside the housing (11) and in fluid communication with the suction port and the discharge port, wherein the gearwheels (14, 15) mesh with each other and have parallel or coinciding axes and a first wheel (14) thereof is driving and a second wheel (15) is driven, a pair of containment bodies (19, 20) for axially containing the wheels (14, 15), said containment bodies (19, 20) being associated with the housing (11) and each comprise a first face (19a, 20a) that faces the pair of gearwheels (14, 15) and a second face (19b, 20b) that is axially opposite with respect to the first face (19a, 20a), and, for each of the two wheels (14, 15), a plurality of rolling bodies (21) that form a crown and that are freely housed in an annular seat (22) that is coaxial to the respective
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: April 7, 2020
    Assignee: SETTIMA MECCANICA S.R.L.
    Inventor: Mario Antonio Morselli
  • Patent number: 10569706
    Abstract: An overhead console includes: a light source; and a light guiding member including bending portions at intermediate positions in the light guiding member such that the light guiding member extends from the light incident surface to the light exit surface so as to form an optical path in which light incident on the light incident surface is reflected by reflecting surfaces provided in the bending portions so as to reach the light exit surface, the light guiding member having such a shape that line segments drawn between given points on the light incident surface and given points on the light exit surface do not include a line segment that passes through only the light guiding member.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: February 25, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Haruko Sato
  • Patent number: 10066645
    Abstract: A turbine valve actuator (100) controls a valve unit of a media-operated consumer unit, such as a steam or gas turbine, and has an actuating part drive (102) with a movable actuating part (104), a first media space (106) and a second media space (108). A pressure build up in the first media space (106) attempts to cause a movement of the actuating part (104) in a first direction (R). A pressure build-up in the second media space (108) attempts to cause a movement of the actuating part (104) in an opposing second direction (GR). The first media space (106) can be supplied with a fluid in predeterminable amounts by a supply (110). The second media space (108) is acted upon by a hydraulic accumulator (112) provided with a preload pressure and permanently connected to the second media space (108).
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: September 4, 2018
    Assignee: HYDAC SYSTEM GMBH
    Inventors: Kristof Schlemmer, Martin Piechnick, Wolfgang Britz
  • Patent number: 9482224
    Abstract: An oil pump includes a housing (10, 20), a rotary shaft (30) which is supported by the housing, an inner rotor (71, 81) which is rotated in the housing integrally with the rotary shaft, an outer rotor (72, 82) which is rotated in the housing as being interlocked with the inner rotor, a rotor case (40) which is fitted into the housing and which contains the inner rotor and the outer rotor and supports an outer circumferential face of the outer rotor in a slidable manner, a side plate (50) which is arranged to be in contact with at least one annular end face of the rotor case, and an elastic member (60) which exerts an urging force to press the side plate to the annular end face of the rotor case. According to the above, slide resistance and operational torque can be reduced and constant side clearance can be maintained.
    Type: Grant
    Filed: January 29, 2013
    Date of Patent: November 1, 2016
    Assignee: MIKUNI CORPORATION
    Inventor: Takehiko Naiki
  • Patent number: 8303265
    Abstract: Axial piston hydraulic pump, comprising at least one piston (2), coupled by suitable transmission means (103, 113) to drive means (3) and slidable with a reciprocating motion inside a cylinder (101), the said cylinder (101) communicating with a fluid intake passage (151) and a fluid delivery passage (161, 301), one-way means (121, 501) of controlling the flow of the fluid being provided in both passages; the said delivery passage (301) communicates, downstream of the said one-way flow control means (501), with a constricted flow discharge member (401, 411, 431, 441).
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: November 6, 2012
    Inventor: Gian Carlo Fronzoni
  • Patent number: 8215923
    Abstract: A system includes a compressor, a control unite and a clutch assigned to the compressor. The control unit is suitable for opening and closing the clutch in order to economize energy. The control unit is suitable for carrying out a monitoring routine during which the clutch is opened or closed in order to prevent the clutch, the compressor and the components arranged downstream of the compressor from being damaged. A method for controlling the system, including the compressor, the control unit and the clutch associated with the compressor, is also provided.
    Type: Grant
    Filed: July 22, 2010
    Date of Patent: July 10, 2012
    Assignee: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
    Inventor: Joerg Mellar
  • Publication number: 20120132287
    Abstract: A pump for conveying a medium comprises a pump chamber having an intake opening and an outlet opening. A movable component is movably disposed in the pump chamber in order to convey a batch of the medium, which is located in the pump chamber, from the intake opening to the outlet opening. A ventilation device has a ventilation opening in fluid communication with the pump chamber. The ventilation opening is different from the intake opening and the outlet opening. The ventilation device is configured to reduce or at least substantially prevent, at least temporarily, the formation of a partial vacuum or a negative pressure in the pump chamber.
    Type: Application
    Filed: November 22, 2011
    Publication date: May 31, 2012
    Applicant: AKTIEBOLAGET SKF
    Inventors: Jürgen KREUTZKAEMPER, Paul SATTELBERGER, Stefan SCHÜRMANN
  • Patent number: 7559750
    Abstract: Provided is an overheating protection apparatus of a scroll compressor which comprises: a bypass passage formed in a fixed scroll, for connecting a high pressure chamber to a low pressure chamber; a valve assembly installed on the bypass passage, for opening/closing the bypass passage; and a heat distortion member for bypassing gas of high temperature and high pressure inside the high pressure chamber to the low pressure chamber by driving the valve assembly toward a direction of opening/closing the bypass passage when a temperature inside the high pressure chamber rises more than an established value. According to this, when a discharged gas rises to an abnormal high temperature, gas inside the high pressure chamber is bypassed to the low pressure chamber, thereby protecting the compressor and also improving reliability thereof.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: July 14, 2009
    Assignee: LG Electronics Inc.
    Inventor: Chan-Hwa Jeong
  • Patent number: 7527595
    Abstract: A diaphragm is provided in a pump case so as to define a pump chamber communicated with an external member having an air chamber. The actuator is provided in the pump chamber. An exhaust valve is provided with a valve body, formed with a slit through which air the pump chamber is exhausted, and a screw member, screwed into a first wall of the pump case to adjust an opening amount of the slit by a screwed amount thereof, thereby adjusting an exhausting rate of the air in the pump chamber. The pump case is formed with a ventilation hole communicated with the pump chamber to allow the air exhausted from the slit to pass through.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 5, 2009
    Assignee: Mitsumi Electric Co., Ltd.
    Inventor: Kenichi Hori
  • Publication number: 20080307808
    Abstract: In a capacity variable device for a rotary compressor and an operation method of an air conditioner having the same in accordance with the present invention, a valve hole (14) in which a sliding valve (81) slidingly inserted is formed at a cylinder, a bypass hole (15) is formed to cross the valve hole (14) and communicate with an intake hole (12) of the cylinder (10), such that resistance of a refrigerant being bypassed is reduced and the operation can be thusly performed with its cooling capability lowered. Accordingly, the efficiency of the compressor can be greatly improved. Also, various operation modes of an air conditioner employing the same can be performed and unnecessary power consumption can be reduced thanks to capacity variable operation. In addition, a structure of the capacity variable device is simplified, thereby lowering a manufacturing cost, simplifying assembly and thusly improving productivity.
    Type: Application
    Filed: August 4, 2005
    Publication date: December 18, 2008
    Inventor: Ozu Masao
  • Patent number: 7438542
    Abstract: A fluid pump assembly comprises a pump housing and a fluid pump disposed within the pump housing. The fluid pump has axially opposite first and second side faces and includes cooperating impeller and rotor members. The fluid pump assembly further comprises inlet and outlet ports disposed adjacent to the first side face, a pressure chamber formed within the pump housing adjacent to the second side face, and an end plate disposed within the pressure chamber and movable relative to the pump between a first position and a second position. The end plate has axially opposite inner and outer end surfaces oriented so that the inner end surface faces the fluid pump, while the outer end surface faces away from the pump. An area of the outer end surface of the end plate is greater than the area of the inner end surface thereof.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: October 21, 2008
    Assignee: Dana Automotive Systems Group, LLC.
    Inventors: Ralph W. Baxter, Jr., Randy Sommer, Stephen Garlick
  • Patent number: 7413415
    Abstract: Reciprocating electromagnetic micro-pump, particularly for small electrical appliances, whose pumping chamber is defined by a tubular element, movable axially, against the action of a contrasting spring, between an advanced position of normal operation of the pump and a retracted position in which the outlet fitting of the pump is placed in communication with the cavity of the hollow body within which is movable in reciprocating fashion the core bearing the piston and which in turn communicates with the inlet fitting of the pump, in such a way as to absorb and anomalous overpressures generated, in operation, downstream of the pump.
    Type: Grant
    Filed: February 12, 2004
    Date of Patent: August 19, 2008
    Assignee: Ceme S.P.A.
    Inventor: Bruno Buzzi
  • Patent number: 7303096
    Abstract: A liquid delivery system includes a first reservoir having a first outlet through which liquid is delivered. A first delivery outlet is located at the lower portion of the first reservoir and a vent is included at its upper portion. A second reservoir located above the first reservoir and has a second outlet located in its lower portion. A first delivery conduit connects the second outlet to the first reservoir and a second delivery conduit connects the upper portion of the first reservoir with the upper portion of the interior of the second reservoir. A vent valve controls communication through the second delivery conduit. A level sensor senses the level of liquid in the first reservoir and causes the vent valve to open when the liquid falls below a first predetermined level and to close the vent valve when on the level rises above a second (higher) predetermined level.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: December 4, 2007
    Assignee: The Water Corporation
    Inventor: Christopher Speight
  • Patent number: 7007828
    Abstract: A liquid chemical metering pump (24) is described that can be fully submerged within a hazardous liquid chemical transport/storage container (28). The pump (24) includes a discharge adaptor (30) that can be received in the outlet aperture (40) of the container (28), in which it is held in sealing relationship by a suitable screw-threaded connector. The discharge adaptor (30) is provided with an intake port (32) in fluid communication with the liquid chemical in the container (28), and a discharge port (34) which is in fluid communication with a discharge tube (36) leading to a flow stream (38). The chemical metering pump (24) is remotely controlled by an electronic controller (26) connected by cable (25) to the chemical metering pump. The chemical metering pump (24) substantially eliminates the need for “double handling” of hazardous liquid chemical, as the chemical can be metered directly from the transport/storage containers in which it is delivered to the end user.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: March 7, 2006
    Assignee: The Water Corporation
    Inventor: Christopher Speight
  • Patent number: 6802697
    Abstract: A pump includes a pump housing, a rotating shaft extending through the pump housing, a plurality of pistons, and a plurality of control sleeves. Each piston may be at least partially, slidably contained within a respective piston sleeve. The pistons may also be be operably coupled to the rotating shaft such that rotation of the shaft rotates and reciprocates the pistons. Each control sleeve may be slidably disposed on a respective one of said piston sleeves and operable to selectively vary the amount of fluid delivered by the pump.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: October 12, 2004
    Assignee: Caterpillar Inc
    Inventor: Haoran Hu
  • Publication number: 20040076530
    Abstract: A pumping system for a fuel injection system includes a body defining a high pressure pumping chamber, a plunger, a high pressure outlet, a high pressure fluid line connecting the pumping chamber to the outlet, a control valve along the fluid line, and a valve and restriction arrangement along the fluid line. The valve and restriction arrangement includes a restriction and a valve body. The valve body is movable between an open position in which fuel flow from the pumping chamber is generally unrestricted by the restriction and a closed position in which fuel flow from the pumping chamber is significantly restricted by the restriction to store energy in the pumping chamber. Advantageously, the high pressure restriction concept may be utilized in a pumping system for various types of rate shaping, including boot injection and square injection, in addition to pilot operation and post injection operations, and others.
    Type: Application
    Filed: January 9, 2003
    Publication date: April 22, 2004
    Inventors: Gregg R. Spoolstra, Robert D Straub
  • Patent number: 6709245
    Abstract: The invention relates to a pump, in particular to oil pumps for internal combustion engines comprising a gear assembly or rotor assembly with one each of a pressure and suction region arranged in a pump housing, which may be sealed from each other by means of an axially displaceable piston valve which defines a supply chamber and a housing cover, closing the pump housing. The pressure region comprises a pressure channel connected to the waist of the control piston, whereby the control piston cooperates with a plunger on the end thereof facing the supply chamber, which is arranged at right angles to the control piston. The plunger is pre-tensioned against the control piston by means of a pressure spring, and the plunger and control piston are connected by means of a sliding surface, arranged at an angle to the control piston axis.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: March 23, 2004
    Assignee: GKN Sinter Metals GmbH
    Inventor: Josef Bachmann
  • Patent number: 6663358
    Abstract: A compressor for providing automatic capacity modulation is disclosed. The compressor comprises a compression chamber, a compressing member, a reexpansion area, a flow passage, a valve member, and a biasing member. The flow passage is in fluid communication with the compression chamber and the reexpansion area. In one position, the valve member permits flow through the flow passage and in a second position it prevents flow. The valve member is subjected to a first operating condition of fluid on one side and a second operating condition of the fluid on the other side. The biasing member exerts a biasing force on the valve member. When the first operating condition reaches a predetermined point relative to the second operating condition, the valve member moves and effects a change in the capacity of the compressor.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: December 16, 2003
    Assignee: Bristol Compressors, Inc.
    Inventors: Joe Frank Loprete, David Turner Monk, Eugene Karl Chumley, Tyrone Scott Simerly, John K. Narney, II, Mark Randall Trent, Panteleimon V. Hatzikazakis, Tom Evans Goodnight, Rongchang Xin, Robert Desmond Douglas
  • Publication number: 20030123998
    Abstract: This invention provides the use of a pump to regulate torque in a planetary gear system. The pump is provided with a moveable piston as an end plate. An actuator, attached to the piston, controls the movement of the piston. In one position, the piston is in contact with the internal components of the pump. When the actuator moves the piston, the piston loses contact with the pump, thus allowing a free flow of fluid between the inlet and outlet of the pump. In this configuration, the pump is no longer able to generate the pressure that creates torque in the planetary gear system.
    Type: Application
    Filed: December 28, 2001
    Publication date: July 3, 2003
    Inventors: Perry Edward Phelan, Joseph Palazzolo
  • Patent number: 6551069
    Abstract: A compressor with a capacity modulation system includes a compression chamber, a rotatable shaft within the compression chamber, and a roller mounted on the shaft in contact with a wall of the compression chamber. A suction channel is in fluid communication with the compression chamber for providing fluid at a suction pressure and a discharge channel is in fluid communication with the compression chamber for removing fluid at a discharge pressure. A re-expansion channel adjacent to the compression chamber has a first end forming a re-expansion port in the wall of the compression chamber. A re-expansion chamber is connected to the re-expansion channel. A valve disposed in the re-expansion channel is movable between a first position, in which the valve allows fluid communication between the compression chamber and the re-expansion chamber, and a second position, in which the valve prevents fluid communication between the compression chamber and re-expansion chamber.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: April 22, 2003
    Assignee: Bristol Compressors, Inc.
    Inventors: John K. Narney, II, David T. Monk, Joseph F. Loprete
  • Patent number: 6530752
    Abstract: In a variable displacement pump, a relief valve is constituted by a pilot drive type relief valve obtained by adding a pilot valve to a main valve, a fluid pressure in a downstream side of a metering orifice provided in a pump discharge side passage is applied to the pilot valve, and the main valve is capable of opening and closing a downstream side passage of the metering orifice with respect to a drain passage.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: March 11, 2003
    Assignee: Showa Corporation
    Inventors: Kenzo Oba, Katsuyuki Yoshida
  • Patent number: 6450778
    Abstract: A pumping system for a fuel injection system includes a body defining a high pressure pumping chamber, a plunger, a high pressure outlet, a high pressure fluid line connecting the pumping chamber to the outlet, a control valve along the fluid line, and a valve and restriction arrangement along the fluid line. The valve and restriction arrangement includes a restriction and a valve body. The valve body is movable between an open position in which fuel flow from the pumping chamber is generally unrestricted by the restriction and a closed position in which fuel flow from the pumping chamber is significantly restricted by the restriction to store energy in the pumping chamber. Advantageously, the high pressure restriction concept may be utilized in a pumping system for various types of rate shaping, including boot injection and square injection, in addition to pilot operation and post injection operations, and others.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: September 17, 2002
    Assignee: Diesel Technology Company
    Inventors: Gregg R. Spoolstra, Robert D. Straub
  • Patent number: 6408975
    Abstract: A variable displacement pump 28 having an electronically modulated solenoid relief valve 100 for controlling fluid flow into the pump 28. An engine control module coupled to the electronic relief valve 100 monitors vehicle speed and steering wheel turning rate change directs the solenoid relief valve 100 to adjust the pressure of fluid displacing a movable cam ring 44 within the pump 28 to provide for greater fluid flow when evasive maneuvers may be required and lesser fluid flow when low steering efforts are needed, thus resulting in energy and fuel savings.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: June 25, 2002
    Assignee: Visteon Global Technologies, Inc.
    Inventors: Leonard F. Bishop, Shawn P. Cap'ser, John D. Dalpiaz
  • Publication number: 20020076334
    Abstract: A vane pump is disclosed for use with gas turbine engines adapted and configured to provide a failure mode similar to that of a traditional gear pump. The vane pump includes a pump housing, a cam member, a cylindrical rotor member and a mechanism for communicating a high pressure fluid from the discharge arc region to the inlet arc region when the tip surface of each vane element has experienced a predetermined amounted of wear so as to prevent pump startup. The wearing of the tip surface of each vane element resulting from the slideable engagement with the circumferential surface of the pumping cavity.
    Type: Application
    Filed: September 28, 2001
    Publication date: June 20, 2002
    Inventors: William H. Dalton, Kurt G. Grochowski
  • Patent number: 6364630
    Abstract: A vane pump, having an inlet for receiving fuel and an outlet from which fuel is supplied, comprising a generally cylindrical member, a driven rotor arranged within the cylindrical member and a closure member. The cylindrical member and the closure member co-operate to define a recirculation passage interconnecting the outlet and the inlet, the output pressure of fuel discharged from the pump being regulated by a resiliently biased valve means controlling the flow of fuel through said recirculation passage.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: April 2, 2002
    Assignee: Delphi Technologies, Inc.
    Inventors: Royston Brian Craft, Christopher Wood
  • Patent number: 6338612
    Abstract: A hydraulic pump system having a pump for pressurizing fluid and a hydraulic chamber for receiving fluid from the pump. An even flow of fluid is outputted from the chamber to a valve assembly. The chamber is formed from a resonator and a resonator cover that are attached in a fluid tight manner by elastic fasteners. The resonator cover acts as a pressure controller in that when the pressure of fluid is of sufficient magnitude, this force creates a gap for controlling fluid pressure output to the valve assembly.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: January 15, 2002
    Assignee: TRW Fahrwerksysteme GmbH & Co. KG
    Inventors: Robert Spillner, Hans-Willi Gerigk
  • Patent number: 6257839
    Abstract: A double screw rotor assembly includes two screw rotors meshed in a bushing inside a casing. The threads of the screw rotors have a constant pitch, and define with the bushing a plurality of air chambers in the pitch. The volumes of the air chambers reduce gradually from the inlet toward the outlet due to reduced tooth height so that the outer diameter defined by the tooth tip of the thread of each screw rotor has the shape of an invertedly disposed cone. An electric driving device is controlled to move the bushing axially in the casing relative to the screw rotors in adjusting the clearance between the inside wall of the bushing and the tooth tip of the thread of each screw rotor, so as to minimize the consumption of starting power and facilitate stable running of the screw rotors, Further, a O-ring is provided at the top wall of the busing and pressed on the casing to keep an airtight status, so as to improve the working efficiency.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: July 10, 2001
    Assignee: Industrial Technology Research Institute
    Inventors: Hong-Sheng Fang, Ming-Hsin Liu, Jiun-Hung Chen
  • Patent number: 6238576
    Abstract: Impure portions such as air bubbles and gelled portions in a liquid are removed so that the liquid can be discharged with improved cleanliness. Under condition that a return flow path and a liquid discharge flow path are closed, a pump chamber is expanded, thereby sucking the liquid in a liquid container portion into a pump chamber through a filter. Under condition that a vent port of the filter and the return flow path are opened and a liquid introducing flow path, the liquid discharge flow path, and a pump inlet flow path are closed, the pump chamber is contracted, thereby returning the liquid in the pump chamber toward the filter so that air in the filter is exhausted to the outside. Under condition that the return flow path and the pump inlet flow path are closed, the pump chamber is contracted, thereby discharging the liquid from the nozzle.
    Type: Grant
    Filed: October 12, 1999
    Date of Patent: May 29, 2001
    Assignee: Koganei Corporation
    Inventor: Takeo Yajima
  • Patent number: 6227823
    Abstract: A compressed gas dispensing station having a high pressure gas compressor with a cyclic control system for selective recirculation of cooled, ultra high pressure gas through the compression chamber after the end of the compression stroke for scavenging hot compressed gas from the compression chamber and providing a residual, partially-expanded replacement gas for the expansion stroke which is mixed with the incoming, new charge of gas for a cryogenic gas at the start of compression and a relatively low temperature gas at the end of compression for a single stage compressor.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: May 8, 2001
    Inventors: Marius A. Paul, Ana Paul
  • Patent number: 6135742
    Abstract: The present invention relates to an eccentric-type vane pump and, in particular, to an eccentric-type vane pump being capable of generating minimum heat and noise due to frictional force produced from rotation of the vane pump. The vane pump comprises a rotor connected to a rotor shaft having vanes slidably received in vane grooves and recessed within a space in the periphery of the rotor for moving radially by rotation of the rotor. A cylinder ring is positioned eccentrically around the rotor and is rotated by the frictional force produced from abutting the front end of the vanes. A pump chamber is formed between the rotor and the cylinder ring. A cylinder body is provided having a bearing between the outer surface of the cylinder ring and the cylinder body. A front body is connected to a first end of the cylinder body. One end of a rotor shaft is supported on a recess formed on one side of the front body.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: October 24, 2000
    Inventor: Bong-Hyun Cho
  • Patent number: 5588809
    Abstract: Metering pumps for the metered feed of liquids are fitted with an intake valve built into an intake line from an intake container, a pump chamber downstream of it with a pumping component altering its displacement volume, a pressure valve leading to the metering connector and a vent and by-pass valve built into a return line leading to the intake container. In order to keep the quality of by-passed metering liquid as small as possible while maintaining adequate venting, there is valve chamber between the pressure valve and the pump chamber and separated from the latter by a return valve and a movable control wall, in which is incorporated the vent controlled by the control wall, opening on the suction stroke of the pumping component and closing on its delivery stroke. .There is also preferably in the valve chamber a prestressed displacement wall altering the volume of the valve chamber in the opposite direction to that of the control wall.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: December 31, 1996
    Assignee: Lang Apparatebau GmbH
    Inventors: Joachim Klein, Herbert Hunklinger
  • Patent number: 5261791
    Abstract: Pumping apparatus for recovering a first liquid, such as a pollutant, floating on a second liquid, such as ground water. A pump immersed in the second liquid, or ground water, operates to produce a cone of depression and discharge the second liquid into a pressure vessel. A variable volume chamber inside the pressure vessel contracts and displaces any contents through an outlet conduit to a product discharge point. When the pump turns off, the variable volume chamber expands and draws product into the chamber to be driven from the chamber during successive pumping operations. Over time periodic pumping operations cause the variable volume chamber to recover the first liquid and move it to a discharge point.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: November 16, 1993
    Assignee: Advanced Remediation Technologies
    Inventor: Robin A. Goguen
  • Patent number: 5203683
    Abstract: A screw pump having a pair of screw rotors meshed with each other and rotatably supported in a housing having an intake port provided at one end and a piston movably provided at the other axial end of the housing, which piston defines a discharge port in cooperation with the housing. The movement of the piston in a direction substantially perpendicular to the axes of the screw rotors enables the distance between a discharge starting position of the discharge port and the intake port to be varied, so that the internal compression ratio can be varied. This arrangement ensures that the size of the housing will not be increased and any disadvantage due to the difference in thermal expansion along the length of the housing can be overcome.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: April 20, 1993
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Mamoru Yoshikawa, Taketoshi Satoh
  • Patent number: 5171131
    Abstract: A rotary fluid energy translating device of the sliding vane type useful as a pump or motor comprising a pressure contained vane unit assembly adapted to be submerged in a body of liquid. The pressure contained vane unit assembly comprises a pair of support plates, a cam ring interposed between the support plates, a rotor rotatably mounted in the cam ring and having a plurality of circumferentially extending vanes adapted to engage the contour of the cam ring and a flexible plate interposed between the cam ring and each of the support plates. Each support plate includes a hub portion spaced from its respective flexible plate. The assembly is clamped together with a clamping force in excess of the hydrostatic forces within the assembly. One of the support plates has an axial opening for insertion of a drive shaft into driving connection with the rotor and the other of the support plates has an axial liquid passage.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: December 15, 1992
    Assignee: Vickers, Incorporated
    Inventor: Albin J. Niemiec
  • Patent number: 5110269
    Abstract: A fuel pumping apparatus, particularly useful for gas turbine engines, includes a dual element positive displacement fuel pump having a centrifugal type boost stage and, downstream, at least two parallel gear type elements. A controllable means for unlocking at least one of the elements includes a bypass line which provides a flow path to the inlet of the fuel pump from the pressurizing chamber of the gear elements which is used to urge end bearings of the gear elements into contact with the revolving gears thereby enabling the gears to pump fluid. Disposed in the bypass line is slide valve to open up the bypass line and unload and render the unloadable gear element inoperative. Control is provided by a Full Authority Digital Electronic Control and its associated Hydromechanical Unit which uses the fuel as a hydraulic fluid to actuate the slide valve.
    Type: Grant
    Filed: October 24, 1990
    Date of Patent: May 5, 1992
    Assignee: General Electric Company
    Inventor: James A. Fallon
  • Patent number: 5085187
    Abstract: A combination gear type oil pump and pressure regulator is disclosed, particularly for a lubricating system of an internal combustion engine. Elements of a gear type pump are housed within an internal recess in the engine crankcase. An end cover is positioned between an enlarged portion of the crankshaft and gear elements and is biased thereagainst by a carefully selected spring which is positioned between the cover member and the enlarged crankshaft portion so that when a predetermined high pressure is formed at the pump outlet, the spring allows the end cover to move away from the pump elements to relieve the pressure by spillage in to the engine crankcase.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: February 4, 1992
    Assignee: Chrysler Corporation
    Inventor: Gregg T. Black
  • Patent number: 5051070
    Abstract: A compressor suitable for use in a vehicle cooling system. The compressor includes a cylinder having a cylindrical inner wall surface, a rotor supported by a crankshaft having an eccentric portion in the cylinder. A pair of vanes are carried at diametrically opposed positions by the rotor to extend in a radial direction, each of the vanes having a radially outward edge which is in sliding contact with the inner wall surface of the cylinder. End plates are secured to the cylinder at the axially opposite ends of the cylinder. A link mechanism is provided between the rotor and at least one of the end plates so that the rotor conducts a reciprocating angular movement in an angular range in response to a rotation of the crankshaft. The inner wall surface of the cylinder, the vanes and the end plates define working chambers of which volumes are variable in response to the angular movement of the rotor.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: September 24, 1991
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Kenichi Kazaoka, Hiroshi Okazaki
  • Patent number: 4993923
    Abstract: A rotary compressor being provided with a capacity regulation valve (16) at the outlet of the compressor. The valve is movable between a first position (18) in sealing cooperation with an end face (19) of the compressor rotor and a second position (20) creating a leakage path between the outlet opening (15) and the inlet opening (14) of the compressor.
    Type: Grant
    Filed: January 12, 1988
    Date of Patent: February 19, 1991
    Assignee: Atlas Copco Aktiebolag
    Inventor: Guido J. E. Daeyaert
  • Patent number: 4944658
    Abstract: A lubrication pump with a stroking action of a delivery piston and with regulatable metering of the amount of lubricant delivered with each stroke of the pump, wherein the delivery piston is actuated by the pump and aspirates the lubricant into a suction space whose volume is adjustable, wherein furthermore the lubrication is fed from the suction space through an intermediate storage space to the lubricant outlet or to the lubrication circulation circuit and wherein a check valve is provided in the above-mentioned delivery path of the lubricant, so that, when viewed in the delivery direction of the lubricant, the check valve is located following the receiving space and upstream of the intermediate storage space.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: July 31, 1990
    Assignee: Baier & Koppel GmbH & Co.
    Inventor: Willibald Buttner
  • Patent number: 4940394
    Abstract: A rotary lobed rotor pump has externally adjustable wearplates in the rotor casing juxtaposed to the parallel ends of rotating lobed rotors. Resilient members such as Belleville springs are adjusted by compression by means external of the rotor casing so that the springs move the wearplate(s) into a design clearance with the parallel rotor ends. No pump disassembly is required to accurately set the clearance. An internal pressure surge by-pass is provided which permits outward movement of either or both wearplates resulting in an increased gap with the rotor ends causing a decrease in the rate of rise in fluid pressure in the internal rotor casing cavities in effect causing rotor slippage.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: July 10, 1990
    Assignee: Baker Hughes, Inc.
    Inventor: Gordon H. Gibbons
  • Patent number: 4834631
    Abstract: In a reciprocating compressor, the separator plate separating the suction and discharge plenums acts as a spring relative to the valve plate assembly. Under liquid slugging conditions the valve plate moves against the biasing force of the separator plate to establish a relief passage between the piston cylinder and the suction plenum.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: May 30, 1989
    Assignee: Carrier Corporation
    Inventors: Douglas A. Schrank, Thomas W. Carter, Joseph P. Vaccaro, William R. Lane
  • Patent number: 4815954
    Abstract: An offset three-gear, two-system pump includes first, second, and third overlapping chambers. First inlet and low-pressure outlet ports communicate with the first and second chambers, and second inlet and high-pressure pressure outlet ports communicate with the first and third chambers. The first chamber has a short wall portion extending from the low-pressure outlet port to the second inlet port, and a long wall portion extending from the high-pressure outlet port to the first inlet port. First, second, and third gears are respectively rotatable in the chambers. The first and second gears form a low-pressure gear set, and the first and third gears form a high-pressure gear set. A small number of first gear teeth are cooperable with the short wall portion and a large number of first gear teeth are cooperable with the long wall portion to effect sealing against leakage from the pressure ports to the inlet ports.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: March 28, 1989
    Assignee: Borg Warner Corporation
    Inventor: Herbert N. Underwood
  • Patent number: 4799865
    Abstract: A screw compressor for intermittent operation, preferably for supplying a pneumatic brake system of an automotive vehicle with compressed air, comprises, in the high pressure end wall (4) of the compressor, a wall plate (14) which seals against the casing wall (2) of the compressor and which can be withdrawn axially of the compressor out of sealing engagement with the casing wall and into a space (16) which is provided in the high pressure end wall, the space (16) communicating with the compressor inlet (12), to thereby fully unload the compressor.
    Type: Grant
    Filed: August 3, 1987
    Date of Patent: January 24, 1989
    Assignee: Svenska Rotor Maskiner AB
    Inventor: Johnny Oscarsson
  • Patent number: 4618018
    Abstract: A power steering device for vehicles having a simple construction, which is capable of minimizing the frictional loss of a hydraulic pump as well as the power consumption of the hydraulic pump and engine.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: October 21, 1986
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yoshihiko Toshimitsu, Tokuro Takaoka, Toshitake Kawai, Takashi Ishida
  • Patent number: 4558993
    Abstract: The compression capacity of a rotary compressor may be changed by a cylinder bypass system. The change of compression capacity is achieved by a slide wall member which composes part of an inside wall of a cylinder containing a compression mechanism and which is movable, thereby bypassing gas being compressed to a suction side of the compressor. The slide wall member is caused to slide forward by gas pressure applied and to slide backward by a spring force. By controlling such gas pressure, the capacity of the compressor may be changed. A relatively large opening is formed in the cylinder when the slide wall member is moved backward, so that the compression capacity can be greatly reduced without a large decrease in efficiency.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: December 17, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Michimasa Hori, Hideo Hirano, Yoshinori Kojima, Jiro Yuda
  • Patent number: 4470762
    Abstract: A hydraulic power steering system has a vane type pump which is operable to supply fluid to a power steering gear at a volumetric rate determined in part by the system pressure or system demand. The flow from the pumping chambers is partially bypassed through a bypass passage formed between the cam ring and the pump thrust plate. The bypass passage is urged to the open position by a bypass spring which urges separation between the cam ring and the thrust plate. The pressure plate of the pump responds to system pressure or demand to urge the cam ring into abutment with the thrust plate thereby reducing the opening and decreasing the bypass flow.
    Type: Grant
    Filed: March 9, 1983
    Date of Patent: September 11, 1984
    Assignee: General Motors Corporation
    Inventor: Paul O. Wendler