Having Additional Chamber Intake Connection From Nonpumping Space Patents (Class 417/439)
  • Patent number: 10273952
    Abstract: A pressure packing for a piston rod of a reciprocating compressor includes a case having a piston rod through bore. A compartment within the case is coincident with the through bore and the compartment has an axial length at least as long as a stroke of the piston rod.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: April 30, 2019
    Assignee: Nuovo Pignone Srl
    Inventors: Carlos Alfredo Trevino, Vinh K. Do, Tomasz Tomaszewski, Jeffrey Allen Raynal
  • Patent number: 10087804
    Abstract: Urea solution pumps having leakage bypass flowpaths and methods of operating the same are disclosed. Certain embodiments are pump apparatuses including an inlet passage in flow communication with a source of urea solution and a pump chamber, an outlet passage in flow communication with the pump chamber and an exhaust after treatment system, a diaphragm facing the pump chamber and coupled with an actuator, a first housing member coupled with a second housing member form a seal around the pumping chamber, a leak collection chamber surrounding the seal, and a return passage in flow communication with the leak collection chamber and the inlet passage. Urea solution that leaks from the pump chamber past the seal is received by the leak collection chamber and flows through the return passage to the pump inlet passage.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: October 2, 2018
    Assignee: Cummins Emission Solutions, Inc.
    Inventors: George Muntean, Nachiket Pawar, Kundana Inala, Steve Holl, Stephanie Apewokin, Cynthia Gosselin, Andrew Myer, Jim F. Burke, John Heichelbech
  • Patent number: 9739130
    Abstract: Fluid end for high pressure reciprocating pump, in particular for hydraulic fracturing pumps, comprising: a body having a first bore (18) for receiving a reciprocating plunger (31), a second bore (19) for accommodating a suction valve (41), and a third bore (21) for accommodating a discharge valve (43), the second bore (19) and the third bore (21) being perpendicular to the first bore (18); at least a tubular sleeve (30) in said first bore (18); at least a tubular cartridge (30) in the second bore and/or third bore; and a fluid tight seal between contacting surfaces of said sleeve (30) and said cartridge (30).
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: August 22, 2017
    Assignee: Acme Industries, Inc.
    Inventor: Fred Young
  • Patent number: 9567985
    Abstract: A high-pressure pump includes a plunger capable of reciprocating, and a housing having a pressurizing chamber in which fuel is pressurized by the plunger, and a fuel chamber through which the fuel flows toward and from the pressurizing chamber. The pump includes a spring that biases the plunger so as to increase the volume of the pressurizing chamber, and a spring seat that is fixed to the housing and is in contact with one end of the spring. A first space that communicates with the fuel chamber via a fuel passage is provided between the bottom of the spring seat and the housing, and a top face of the bottom exposed to the first space is covered with a heatinginsulating member.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: February 14, 2017
    Inventors: Tatsuhiko Akita, Kenichi Saito
  • Patent number: 9541312
    Abstract: A vapor expansion/compression system having an oil sump for lubrication of the turbine/compressor bearings includes an oil and/or vapor vent line leading from a strategic location in the oil sump to the condenser such that the oil level in the sump is limited to the predetermined level, and any excess oil is pumped from the sump to thereby prevent the oil level from reaching a level at which bearings failure could be caused due to a high oil level.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: January 10, 2017
    Assignee: United Technologies Corporation
    Inventors: Lance D. Woolley, Peter S. Matteson
  • Patent number: 9470436
    Abstract: A cryogenic refrigeration apparatus includes a compressor, a plurality of refrigerators, and a gas line configured to connect the plurality of refrigerators to the compressor in parallel so as to circulate a working gas between each of the plurality of refrigerators and the compressor. The gas line may include a flow rate control valve capable of individually controlling a pressure drop of a flow of working gas in a corresponding one of the plurality of refrigerators. The flow rate control valve may be provided in series with the corresponding refrigerator.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: October 18, 2016
    Assignee: Sumitomo Heavy Industries, Ltd.
    Inventors: Kakeru Takahashi, Takaaki Matsui
  • Patent number: 9388801
    Abstract: A positive displacement reciprocating compressor for compression of natural gas. The compressor includes at least one pair of coaxial bulkheads, each bulkhead having a gas cylinder coupled thereto, and one or more a scissor drive assemblies for driving piston rams into and out of the gas cylinders to compress gas. The scissor drive assembly of the compressor includes one or more piston rams having a piston head attached thereto and movable into and out of each gas cylinder via reciprocating movement of a linkage arm assembly, coupling the piston rams to a rotatable drive shaft. The compressor can be used for compressing natural gas for use as a fuel for vehicles, appliances, generators, or the like.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: July 12, 2016
    Inventor: Douglas Rietkerk
  • Patent number: 8985968
    Abstract: A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: March 24, 2015
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Teppei Matsumoto, Masatoshi Kuroyanagi, Osamu Hishinuma
  • Patent number: 8979509
    Abstract: A screw compressor includes a casing and a compression mechanism accommodated in the casing. The compression mechanism has a screw rotor, a gate rotor and a communication mechanism. The gate rotor has a flat plate shape. A rotational axis of gate rotor is orthogonal to a rotational axis of the screw rotor. The communication mechanism is arranged to communicate a high pressure space and a low pressure space in the casing.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: March 17, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Norio Matsumoto, Hiromichi Ueno, Shigeharu Shikano
  • Publication number: 20140127062
    Abstract: A plunger pump includes a housing with a discharge valve in communication with an outlet. The housing includes a bore that slidably accommodates a plunger. The housing also includes an inlet. The plunger has a closed proximal end connected to an actuator and a distal end with an outlet valve. The plunger also includes a sidewall with an opening that is in communication with the inlet of the housing. Fluid flows through the inlet and through the opening and into the plunger. When the plunger is retracted away from the discharge valve, the outlet valve of the plunger opens thereby providing fluid for the housing bore. As the plunger is moved towards the discharge valve, pressure in the housing bore increases thereby opening the discharge valve and permitting the pressurized fluid to exit through the outlet.
    Type: Application
    Filed: November 2, 2012
    Publication date: May 8, 2014
    Applicant: CATERPILLAR INC.
    Inventors: Chris Paul Buckley, Ronald Dean Shinogle, Ryan A. Johnson, Matthew Paul Giacomi
  • Patent number: 8512015
    Abstract: This refrigeration compressor includes a plurality of compression units, each compression unit having a cylinder head including a refrigerant suction chamber and a refrigerant discharge chamber, a refrigerant distribution device having a distribution pipe and bypass pipes putting the distribution and the suction chambers of the compression units in communication, and a refrigerant discharge device having a discharge pipe and bypass pipes putting the discharge pipe and the discharge chambers of the compression units in communication. The compressor also includes a pressure equilibration pipe arranged to put the suction chambers of at least two compression units and/or the discharge chambers of at least two compression units in communication.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: August 20, 2013
    Assignee: Danfoss Commercial Compressors
    Inventors: Philippe Dugast, Patrice Bonnefoi, Jean De Bernardi, Philippe Dewitte
  • Patent number: 8360287
    Abstract: A foam pump for pumping a foamable liquid from a foamable liquid source includes a premix chamber having an interior volume receiving the foamable liquid from the foamable liquid source. The foam pump also include a premix chamber air inlet valve, and a collapsible air chamber surrounds the premix chamber and fluidly communicates with the interior volume of the premix chamber through said premix chamber air inlet valve. The collapsible air chamber has an expanded volume and a compressed volume, and, when the collapsible air chamber is moved from its expanded volume to its compressed volume, air within the collapsible air chamber is forced into the premix chamber through the premix chamber air inlet valve and mixes with the foamable liquid received in the premix chamber. An outlet communicates with the premix chamber and, upon compression of the collapsible air chamber from its expanded volume to its compressed volume, foamable liquid and air are advanced from the premix chamber into the outlet.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: January 29, 2013
    Assignee: GOJO Industries, Inc.
    Inventors: Nick E. Ciavarella, Daniel M. Willis
  • Publication number: 20100272583
    Abstract: Provided is a valve plate of a reciprocating compressor, the reciprocating compressor including a front housing and a rear housing, a cylinder block having a plurality of cylinder bores, a drive shaft rotatably supported by the front housing and the cylinder block, a swash plate connected to the drive shaft to be rotated therewith to vary its inclination angle, pistons reciprocally accommodated in the cylinder bores depending on slide movement of the swash plate, a valve plate installed between one end of the cylinder block and the rear housing and having a suction port and a discharge port, and a suction chamber and a discharge chamber that are formed in the rear housing with the valve plate interposed therebetween, characterized in that an oil suction passage, an oil discharge passage and a coolant supply passage are formed in a surface of the valve plate opposite to the pistons, the oil discharge passage is constituted by at least two branch passages directed from a center part toward an outer periphery of
    Type: Application
    Filed: December 24, 2008
    Publication date: October 28, 2010
    Inventors: Geonho Lee, Haksoo Kim, Kibeom Kim, Ikseo Park, Kijung An, Stefan Kroess
  • Patent number: 7727176
    Abstract: The invention relates to support element (4) comprising a main body (6) having a front wall (25) and a peripheral wall (32) projecting away from the front wall. The front wall and the peripheral wall define a housing compartment (33) designed to receive a fluid distribution circuitry cooperating with a treatment unit for defining an integrated blood treatment module.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: June 1, 2010
    Assignee: Gambro Lundia AB
    Inventors: Claudio Tonelli, Vincenzo Baraldi, Massimo Zaccarelli, Annalisa Delnevo, Francesco Ribolzi, Jacques Chevallet, Jacques Duchamp, Aziz Aberkane, Gabriel Meyssonnier, Dominique Pouchoulin
  • Patent number: 7604462
    Abstract: A high pressure pump draws fluid from a fluid inlet into a compression chamber through an inlet chamber. The high pressure pump has a fluid chamber that communicates with the fluid inlet via the inlet chamber. The high pressure pump includes a plunger and a cylinder. The plunger draws fluid from the inlet chamber into the compression chamber when the plunger moves in a drawing direction. The plunger is capable of pressurizing fluid in the compression chamber when the plunger moves in a pressurizing direction. The cylinder movably supports the plunger therein. When the plunger moves in the drawing direction, fluid in the inlet chamber is drawn into the compression chamber, so that fluid flows from the fluid chamber into the inlet chamber.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: October 20, 2009
    Assignee: Denso Corporation
    Inventor: Hiroshi Inoue
  • Publication number: 20090155105
    Abstract: There is provided a liquid pump in which pulsation can be properly absorbed even if the pump is driven at a high frequency. A pulsation absorbing unit 14 for absorbing pulsation includes a pulsation absorbing housing 44 disposed on a pump housing member, a second diaphragm 48 attached to the pulsation absorbing housing member and defining a pulsation absorbing chamber 46 communicating with a liquid outlet passage 32 of a liquid pump unit, and a disc spring 50 for biasing the second diaphragm toward the pulsation absorbing chamber.
    Type: Application
    Filed: October 19, 2006
    Publication date: June 18, 2009
    Inventors: Kenji Mizuno, Yasumasa Oki
  • Patent number: 7354255
    Abstract: The present invention is an improved vibratory pumping mechanism that increases the efficiency of utilization of the vibratory motion within a mechanism. More specifically, the mechanism includes a central chamber within which a piston is oscillated to draw fluid into the chamber and expel fluid from within the chamber outwardly through a nozzle connected to the chamber. The chamber includes a pressure tube connected to a rearward end of the chamber and to a secondary chamber positioned around and in fluid communication with the chamber. The pressure tube allows the negative pressure generated by the motion of the piston in either direction to be utilized in preventing any fluid from being directed out of the mechanism in a direction other than through the nozzle, thereby increasing the efficiency of the pump.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: April 8, 2008
    Inventors: Grigori Lishanski, Oleg Lishanski
  • Patent number: 6846166
    Abstract: In a reciprocating pump, drive power of a drive-power supply member is transmitted to a diaphragm within a diaphragm drive chamber via operating fluid. An operating-fluid-flow regulation chamber for regulating the flow of operating fluid is located between the drive-power supply member and the diaphragm drive chamber. A first gas discharge member and a second gas discharge member are respectively located in an upper part of the inside of the operating-fluid-flow regulation chamber and an upper part of the inside of the diaphragm drive chamber. The first gas discharge member is held in fluid communication with the second gas discharge member so as to constitute a single gas discharge mechanism. This single gas discharge mechanism is provided with a reverse-flow prevention member for preventing a reverse flow of fluid from the first gas discharge member to the second gas discharge member.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: January 25, 2005
    Assignee: Tacmina Corporation
    Inventor: Shigehisa Kinugawa
  • Publication number: 20040258546
    Abstract: A blower housing may be used with a climate control furnace or with a water heater and provides cooling of the motor that rotates the blower fan and also provides dilution and cooling of exhaust gases drawn from the furnace or water heater. The housing has an interior dilution compartment that communicates with an elongate conduit. The dilution compartment receives dilution air through the conduit, thereby reducing blower operation noise at the blower housing.
    Type: Application
    Filed: April 23, 2004
    Publication date: December 23, 2004
    Inventor: William Stuart Gatley
  • Publication number: 20040109775
    Abstract: A high-pressure fuel pump for internal combustion engines with direct injection includes a housing with a drive chamber in the housing and an eccentric shaft disposed in the drive chamber. A pumping element can be set into a reciprocating motion via the eccentric shaft. To lengthen the service life of the fluid pump the drive chamber in a region located ahead of the pumping element in terms of the direction of rotation of the eccentric shaft or camshaft, communicates with a lubricant relief region.
    Type: Application
    Filed: April 4, 2003
    Publication date: June 10, 2004
    Applicant: Robert Bosch GmbH
    Inventors: Alois Hartsleben, Josef Walkner, Andreas Tasche, Guenther Rabanser
  • Patent number: 6733256
    Abstract: The invention relates to a device for producing consumables, especially filled chocolates that consist of a coated filling. The aim of the invention is to provide a device for feeding substances of the consumables to nozzles in a controlled manner. To this end, the device is provided with pumps that comprise pump pistons in a pump chamber and at least two pump chambers are located in a pump housing one on top of the other.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: May 11, 2004
    Assignee: KMB Produktions AG
    Inventor: Josef Guido Knobel
  • Patent number: 6595758
    Abstract: The invention relates to a process for conveying damp gases by means of a conveyor device (1) and also relates to a conveyor device (1) for carrying out the process. The conveyor device (1) has at least one feed pump (2) with an oscillating reciprocating piston (3) in a delivery chamber (7). In order to dry the conveyor device (1) effectively in the region of the delivery chamber (7), the delivery chamber (7) of at least one feed pump (2) is intermittently ventilated at various intervals in time using an ventilation device (15) while the conveyor device (1) is in operation.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: July 22, 2003
    Assignee: KNF Neuberger GmbH
    Inventors: Erwin Hauser, Heinz Riedlinger
  • Patent number: 6447273
    Abstract: A variable-delivery high-pressure fuel pump having a pump chamber varying in volume as a plunger moves in and out, an inlet port valve forming a part of chamber walls of the pump chamber, the inlet port valve being opened when a low-pressure fuel is admitted into the pump chamber, while being closed when the admitted fuel is delivered out of the pump chamber, a control chamber on an opposing end of the inlet port valve to receive the low-pressure fuel from the fuel inlet passage, and a control valve for intermittently opening and blocking a fluid communication between the control chamber and the fuel inlet passage. The inlet port valve is a poppet valve made with a valve head having a valve face moving off and reseating against a valve seat in the pump chamber, and a valve stem integral with the valve head and extending out of the pump chamber into the control chamber.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: September 10, 2002
    Assignee: Isuzu Motors Limited
    Inventors: Terukazu Nishimura, Shoshi Hidaka
  • Patent number: 6299417
    Abstract: A back pressure structure of a scroll compressor having a fixed scroll forming a plurality of compressive chambers together with an orbiting scroll in its casing; including: a suction pressure space having a predetermined volume formed at one side of the fixed scroll; a suction hole formed for guiding a part of an intermediate gas filled in an intermediate pressure space filled in the rear side of the orbiting scroll to the suction pressure space by passing through the fixed scroll; a vent hole formed at the other side of the suction pressure space for guiding the intermediate pressure gas flown into the suction pressure space through the suction hole to the outermost compressive chamber which has a relatively low pressure; and a back pressure control valve elastically supported by an elastic member in the suction pressure space to open and close the suction hole, and receiving almost the same pressure no matter that it is opened or closed, according to which an intermediate pressure space between a main fram
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: October 9, 2001
    Assignee: LG Electronics, Inc.
    Inventors: Dong Ku Shin, Young Il Chang
  • Patent number: 6004105
    Abstract: A fluid powered diaphragm pump with an adjustable stroke is provided. The stroke of the pump is adjusted by providing an inner diaphragm plate assembly that includes a retractable piston. The piston is biased towards the inner plate by one or more standoffs that attach the piston to the plate. The bias of the piston is overcome by pressurized fluid that is communicated to a chamber defined by the piston and the inner plate. The fluid may be communicated to the chamber through the diaphragm rod. The inner diaphragm plate assemblies of both diaphragm chambers may be connected to different pressurized fluid supplies there enabling the stroke or capacity of the two diaphragm chambers to be controlled independently. As a result, the stroke or capacity of the two diaphragm chambers may differ.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: December 21, 1999
    Assignee: Warren Rupp, Inc.
    Inventor: Steven M. Reynolds
  • Patent number: 5860798
    Abstract: The pump has a sleeve-like bearer. This contains a bush in which a piston is displaceable along an axis. The bearer inner surface and the bush outer surface are adjacent to one another in parts and are separated from one another in parts by an intermediate space. The inlet of the pump is connected through an intake chamber located at least partly inside the bush and through the piston, via a non-return valve, to a pump chamber, which is connected via another non-return valve to a primary outlet of the pump. The intermediate space connects the inlet and the intake chamber to a secondary outlet which is a distance away, along the axis, from the inlet and the intake chamber. During the operation of the pump, fluid flows from the inlet through the intermediate space to the secondary outlet and cools the bush.
    Type: Grant
    Filed: March 1, 1996
    Date of Patent: January 19, 1999
    Assignee: Cryopump AG
    Inventor: Claudio Tschopp
  • Patent number: 5540569
    Abstract: Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities. The invention is particularly useful for ink jet printing applications.
    Type: Grant
    Filed: January 17, 1995
    Date of Patent: July 30, 1996
    Assignee: Micropump, Inc.
    Inventors: Tim J. Altham, Paul A. Johnson
  • Patent number: 5503537
    Abstract: The present invention relates to a gas compressor which prevents noise being produced in the suction conduit during idling. In conventional systems, the noise results from the collision of arriving and returning gas by means of a check valve provided between the suction chamber and the suction conduit. The present invention avoids this noise by providing an additional chamber which is connected via an admixture valve to the compression chamber (20) during the idling operation. This invention is especially applicable to pneumatic systems in automotive technology.
    Type: Grant
    Filed: June 21, 1994
    Date of Patent: April 2, 1996
    Assignee: WABCO Vermogensverwaltungs GmbH
    Inventors: Heinrich Schlossarczyk, Werner Heger
  • Patent number: 5466131
    Abstract: Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: November 14, 1995
    Assignee: Micropump Corporation
    Inventors: Tim J. Altham, Paul A. Johnson
  • Patent number: 5372483
    Abstract: An axial multi-piston type compressor includes: a drive shaft; a cylinder block having cylinder bores surrounding the shaft, a central circular space, and respective radial passages for communicating the bores with the space; pistons slidably received in the respective bores, and a housing associated with the block to define a crank chamber. The pistons are successively reciprocated in the bores by a rotation of the shaft so that a suction stroke and a discharge stroke are alternately executed in each bore. A suction rotary valve is rotationally and slidably received in the space to be cooperated with the passages for successively introducing a fluid into the bores subjected to the suction stroke, through the corresponding passages thereof, and for successively closing the passages of the bores subjected to the compression stroke.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: December 13, 1994
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Kazuya Kimura, Hideki Mizutani, Shigeyuki Hidaka
  • Patent number: 5295807
    Abstract: An auxiliary chamber is connected to the main pumping chamber of a liquid dispensing pump. The auxiliary chamber includes a resilient rolling diaphragm in fluid communication with the fluid in the main pumping chamber and is expandable for receiving liquid from the main pumping chamber during an output stroke with an adjustable stop member being located behind the diaphragm for restricting the displacement of the diaphragm by the volume of fluid entering the secondary chamber from the pumping chamber and thus controlling the output from the pump by controlling the net internal pump chamber volume.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: March 22, 1994
    Assignee: The Coca-Cola Company
    Inventors: Ronald L. Wiley, John H. Bearden
  • Patent number: 5230613
    Abstract: A common rail fuel system, primarily including a high-pressure fuel pump, a rail, fuel injection nozzles, and an electronic control system, is disclosed. A substantially constant fuel pressure is maintained within the rail by the fuel pump under the direction of the electronic control system. The pressurized fuel is communicated to the fuel injection nozzles, which are also under the direction of the electronic control system, thereby providing fuel at injection pressure immediately upon the actuation of the fuel injection nozzles by the electronic control system. The pump incorporates leakage fuel during each stroke without the necessity of rerouting the leakage fuel through a primary supply. This reduces the total amount of fuel pumped and improves metering accuracy.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: July 27, 1993
    Assignee: Diesel Technology Company
    Inventors: Richard L. Hilsbos, Harold L. Wieland, Robert D. Straub, Richard F. Teerman, Robert C. Timmer
  • Patent number: 5222877
    Abstract: A motor compressor unit comprises a hermetically sealed housing, a vibration motor with a rotationally vibrating drive shaft, and a symmetrical twin free-piston compressor comprising two oppositely disposed identical free pistons which can be reciprocated in respective cylinders by the drive shaft. In order to minimize piston drift from the center position, each cylinder is formed with a duct connecting the respective compression space to the space between the housing and the motor-compressor where the suction pressure prevails, which ducts are situated at equal distances from the respective cylinder end walls and can be closed by the respective pistons. As a result of this, the pressure in both cylinders is built up with the same swept volume and piston drift is minimized.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: June 29, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Antonius A. J. Benschop, Johannus C. M. Roelofs
  • Patent number: 5152677
    Abstract: A dry-running reciprocating compressor which has a drive mechanism with a crankcase, in which at least one crankshaft is mounted to rotate in bearings. The drive mechanism is operatively connected with at least one piston-cylinder arrangement of the compressor to compress air to the desired compression pressure. The intake air to be compressed is used for interior cooling of the drive mechanism, and for this purpose, the intake air is conducted through a filter into the interior of the crankcase. For specific cooling of especially critical parts and areas of the components and units in the interior of the crankcase, additional air conducting devices, such as air baffles, fins or the like can be provided. Preferably, the reciprocating compressor has three stages.
    Type: Grant
    Filed: April 18, 1991
    Date of Patent: October 6, 1992
    Assignee: Bauer Kompressoren GmbH
    Inventors: Heinz Bauer, Franz Mayr
  • Patent number: 5145339
    Abstract: A multiple piston cylinder reciprocating pump is provided with a cam drive such that the sum of the velocities during the pumping strokes of all of the cylinders is generally constant. The leak free design is provided by utilizing a diaphragm attached to the piston between the main seal assembly and the cam. A flow through intake design is provided which flows incoming material around the piston between the diaphragm and the main seal to prevent the build-up and hardening of material on the piston and in the seal area. The intake and exhaust passages are arranged such that air pockets cannot be formed and any air bubbles which find their way into the pump will rise upwardly out of the pump without restriction.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: September 8, 1992
    Assignee: Graco Inc.
    Inventors: Kenneth E. Lehrke, Bruce A. McFadden
  • Patent number: 5056991
    Abstract: To improve a cryogas pump, in particular a cryogas pump for cryogenic hydrogen fit for use in vehicles, comprising a cylinder housing and a piston which forms with the cylinder housing a first compression space for the cryogenic gas and which is mounted with a first piston section adjacent to the first compression space by a gas film in the cylinder housing such that owing to its dimensions it can be constructed so as to be fit for use in vehicles, with the shorter piston length requiring less cooling of the piston by the gas film, it is proposed that the cryogas pump comprise a second compression space with which the gas film is in communication and by means of which a flow of gas can be generated in the gas film in the direction of the first compression space.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: October 15, 1991
    Assignee: Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.v.
    Inventors: Walter Peschka, Gottfried Schneider
  • Patent number: 5046929
    Abstract: A piston-type compressor includes a cylinder having a liner sleeve in which is mounted a reciprocating piston driven by a crankshaft through a connecting rod. The piston forms a dynamic seal with the sleeve with the volume above the piston head defining a first, or compression chamber. Connected between the piston and the compressor cylinder is a flexible sealing element such as a bellows which defines a second, isolating chamber between the bellows and the dynamic seal and which further defines a third, or crankcase chamber between the bellows and the region of the compressor which includes the crankcase. The volumes in the second and third chambers are chosen so that the pressures therein are generally equal. A bypass filter assists in eliminating the pressure differential across the bellows during startup by maintaining the pressure within the intermediate and crankcase chambers substantially equal.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: September 10, 1991
    Assignee: Digital Equipment Corporation
    Inventors: Shlomo Novotny, Mark Kushnir, Ran Yaron
  • Patent number: 5017105
    Abstract: A metering pump comprises a diaphragm chamber with a diaphragm, a suction conduit connecting the diaphragm chamber with a metering agent tank, a pump cylinder defining a cylinder space and having an inlet connected to the diaphragm chamber and an outlet connected to a metering point through a metering conduit, and a metering piston in the pump cylinder. The metering piston is formed as a hollow tubular piston which comprises an annular seal disk at the side thereof opposite to the metering conduit. The cylinder space is defined by a stop ring and an actuating tappet movingly passes therethrough. At the beginning of a suction stroke the seal disk sealingly abuts the stop ring but allows the metering agent to pass through during the further movement of the tappet. The metering piston in no position thereof emerges from a compression ring.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: May 21, 1991
    Assignee: Grunbeck Waseraufbereitung GmbH
    Inventor: Franz Rottel
  • Patent number: 4995304
    Abstract: An extendable cylinder of elastically variable length and substantially invariable circular cross section is combined with another such extendable cylinder or a movable separating organ to form an operating unit. One of the extendable cylinders of the operating unit is arranged for two or three dimensional motion of a free one end as it extends. For example, symmetric, concentric elastic cylinders between common plates at opposite ends of the cylinders extend together two dimensionally.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: February 26, 1991
    Assignee: Firma Carl Freudenberg
    Inventor: Berthold Daimler
  • Patent number: 4966755
    Abstract: A method and apparatus for treating a material with gas or vapour, especially a fumigant, comprises a sealable enclosure device, a pump which may have an inlet for the agent and a heat reservoir, and a long flexible hose to allow the enclosure to be evacuated after treatment and the effluent discharged outside the premises where the material is treated.
    Type: Grant
    Filed: June 1, 1988
    Date of Patent: October 30, 1990
    Assignee: Rentokil Limited
    Inventor: Colin P. Smith
  • Patent number: 4923373
    Abstract: A hydraulic single piston pump for manual operation has a piston (3) with a first channel (14, 20) running from piston chamber (7) to the rod chamber (5). The first channel has a check valve (15-19) opening in the return stroke. The piston (3) also has at least one second channel (22, 23, 25) running from the piston chamber (7) to the rod chamber (5). The second channel is configured as a choke bore (23, 25) along at least a part of its length.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: May 8, 1990
    Assignee: Flutec Fluidtechnische Gerate GmbH
    Inventors: Stefan Rothaar, Otfried Stuck
  • Patent number: 4911618
    Abstract: A cryocompressor includes a check valve arranged in a circuit connecting a compression chamber defined by a piston disposed in a cylinder with an annular gap small enough to provide an expected sealing effect to a buffer chamber also defined by the piston in the cylinder, a cross sectional area of the annular gap between the piston and the cylinder being larger on the side of the compression chamber than on the side of the buffer chamber.
    Type: Grant
    Filed: June 16, 1988
    Date of Patent: March 27, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takuya Suganami, Yoshio Kazumoto
  • Patent number: 4911617
    Abstract: An air pressure circuit comprising a compressor cylinder which is divided into two chambers by a slidable piston, a suction port and an exhaust port each, having a valve and mounted on one chamber of the cylinder, inhaling air of a pressure higher than that of atmospheric air form the suction port and exhausting the piston-compressed air from the exhaust port. The air pressure in the side of suction port is introduced from the other chamber of the cylinder.
    Type: Grant
    Filed: May 4, 1989
    Date of Patent: March 27, 1990
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shuuichi Buma, Nobutaka Ohwa, Osamu Takeda, Hajime Kamimae
  • Patent number: 4817390
    Abstract: A cryogenic compressor wherein a compression space and a buffer space which are partitioned off from each other by means of a reciprocating piston are directly connected together through a passage which is provided with a check valve that allows a gas to flow only from the buffer space to the compression space and a purification chamber filled with a purifying substance. Thus, when the pressure within the compression space is about to become lower than the pressure within the buffer space, the gas is led from the buffer space to the compression space via the passage which connects these spaces directly to each other through the check valve, and even if this gas has been contaminated, it is purified by the purifying substance charged in the purification chamber and therefore the contamination of the working gas is prevented.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: April 4, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takuya Suganami, Yoshio Kazumoto
  • Patent number: 4784588
    Abstract: A plunger pump including an inlet chamber for forwarding a fluid drawn by suction to a pump chamber via a suction valve, and an outlet chamber for receiving from the pump chamber a fluid pressurized in the pump chamber via a discharge valve. The inlet chamber and outlet chamber are formed in a main body and located radially outwardly of seal packings in close proximity thereto.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: November 15, 1988
    Assignee: Kioritz Corporation
    Inventors: Susumu Miyashita, Nobuyuki Hotta
  • Patent number: 4739904
    Abstract: A dispenser pump has pump chamber (34) whose volume is variable to draw up or discharge material, by the axial movement of a cup (25) on a stationary hollow stem (12). The seal (16) between them slides on an inner wall of the cup. A collector (30) at the lower end of the cup causes any material leaked past the seal to be guided inwardly to apertures (33) where it may drop to a body part (9) and pass via apertures (11') to a container (1) of the material.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: April 26, 1988
    Assignee: The English Glass Company Limited
    Inventors: Jeffrey W. Spencer, Anthony Wass
  • Patent number: 4681516
    Abstract: A liquid supply pump adapted for coupling to a reciprocable motor, particularly for pumping liquids having thermosetting properties. The pump incorporates a double-acting piston in a pumping cylinder, driven by an elongated drive shaft which projects from the top of the pump for reciprocable motion, the pump having a lower intake valve and an upper exhaust valve, and an intermediate drive shaft seal above the pumping cylinder and a liquid and air drive shaft seal proximate the point of projection of the drive shaft from the pump, wherein said two seals are spaced apart by a distance greater than the pump stroke length, and a liquid drainage path from the intermediate seal back to the pump intake region.
    Type: Grant
    Filed: November 3, 1986
    Date of Patent: July 21, 1987
    Assignee: Graco Inc.
    Inventors: John G. O'Hara, Frederick A. Powers, Steven E. Peter
  • Patent number: 4594059
    Abstract: A diaphragm pump for fluids has a housing, a fluid displacement part including a displacement chamber and a pump diaphragm, and a flow control including a damping chamber arranged to absorb pressure impacts a fluid in aspiration region and having an adjustable fluid admission volume so as to change a fluid supply to the pump diaphragm.
    Type: Grant
    Filed: March 27, 1985
    Date of Patent: June 10, 1986
    Inventor: Erich Becker
  • Patent number: 4538970
    Abstract: A reciprocating electric motor-pump assembly for wells lifts well fluid on downstroke of the motor-pump assembly, and with the motor above the pump the well fluid is conducted from below the motor to above the motor via a flow passage through the motor armature, which is tubular.
    Type: Grant
    Filed: October 17, 1983
    Date of Patent: September 3, 1985
    Inventor: Thomas A. Rabson
  • Patent number: 4492529
    Abstract: The cylinder of a reciprocating compressor is provided with a flanged collar defining an annular recess adjacent the side walls of the cylinder bore disposed for entry of the piston skirt during the downstroke into the recess, compressing gas therein. Communication is provided between the recess and the space above the piston and cylinder head, increasing the initial pressure above the piston and causing greater pressure to be developed during the compression stroke. The result is an increase in the volumetric efficiency of the compressor.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: January 8, 1985
    Inventor: Robert B. Grisbrook