Condition Responsive Control Of Fluid Patents (Class 417/253)
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Patent number: 10578005Abstract: An apparatus includes two pumps and a circuit-changing valve connected to two cooling circuits, with the valve being controlled by a pressure differential created by the pumps. This simplifies controls, reduces components of the pumping system, and also provides a backup pump for each system. The valve's spool is controlled so that when the first pump is started before the second pump (or it generates a higher fluid pressure), the valve causes the two pumps to be connected in a serial arrangement with fluid being pumped through the first circuit and then through the second circuit. But when the second pump is started before the first pump, the valve causes the two pumps to be connected in a parallel arrangement so that the first pump moves fluid only through the first circuit, and the second pump moves fluid only through the second circuit. The valve includes an anti-dithering device.Type: GrantFiled: January 30, 2017Date of Patent: March 3, 2020Assignee: GHSP, Inc.Inventors: David Michael Mitteer, Bradley John Vecellio
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Patent number: 9476502Abstract: A hydraulic pressure supply system of an automatic transmission for a vehicle is disclosed. The hydraulic pressure supply system of an automatic transmission for a vehicle may supply a low hydraulic pressure generated at a low-pressure hydraulic pump to a low pressure portion through a low-pressure regulator valve, may supply a portion of the low hydraulic pressure to a high-pressure hydraulic pump, and may supply a high hydraulic pressure generated at the high-pressure hydraulic pump to a high pressure portion through a high-pressure regulator valve.Type: GrantFiled: November 25, 2013Date of Patent: October 25, 2016Assignee: Hyundai Motor CompanyInventors: Se Hwan Jo, Jin Young Hwang, Taehwan Wi
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Patent number: 9057374Abstract: An oilless screw compressor incorporating water-cooled cooling units for cooling compressed air discharged from compressor bodies having a pair of male and female screw rotors which can be rotated in a contactless and oilless manner, the cooling units comprising a plate type heat-exchanger, and the amount of cooling water for the plate type heat-exchanger being adjustable. With this configuration, a difference between a temperature during load operation and a temperature upon automatic stopping and during unload operation of the compressor can be reduced, so that the cooling unit can be restrained from being damaged or broken within a short period, thereby it is possible to provide a highly reliable oilless screw compressor.Type: GrantFiled: June 20, 2011Date of Patent: June 16, 2015Assignee: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.Inventors: Hideki Fujimoto, Hitoshi Nishimura, Natsuki Kawabata
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Publication number: 20150147193Abstract: In some aspects, a compressor system includes a compressor train including two or more compressors connected in series and a control mechanism. The control mechanism is controlled by a performance controller. The performance controller is operable to identify a process variable of the performance controller; receive, on a recurrent basis from a load sharing controller, a setpoint for the process variable of the performance controller; and control the control mechanism based on the setpoint and the process variable of the performance controller. The setpoint is determined dynamically during operation of the two or more compressors by the load sharing controller based on a load sharing parameter associated with the two or more compressors.Type: ApplicationFiled: November 25, 2013Publication date: May 28, 2015Applicant: Woodward, Inc.Inventors: Walter Grassens, Brian Eldredge
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Publication number: 20150125313Abstract: A fuel system includes a pump unit having at least a fixed displacement pump supplying pressurized flow. A fuel control assembly receives flow from the pump unit and includes at least one metering valve and at least one throttling valve. A control (bypass valve control) for the fixed displacement pump receives first and second pressure signals indicative of a pressure differential across the throttling valve, or across the metering valve/throttling valve combination, for altering output from the fixed displacement pump in response to the pressure differential. In other embodiments, the pump unit includes a centrifugal pump and a fixed displacement pump that can be fully or partially redundant depending on sizing of the pumps, and the system requirements.Type: ApplicationFiled: May 1, 2013Publication date: May 7, 2015Inventors: Robert Nyzen, Martin A. Clements
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Publication number: 20150118065Abstract: According to one embodiment, a pump unit provided for piping which feeds a liquid at a preset unit flow rate includes (n+1) pumps and a constant flow valve. The (n+1) pumps are arranged in series and set to pressurize the liquid so as to achieve the unit flow rate when n pumps are arranged in series. The constant flow valve is installed downstream of the (n+1) pumps. The constant flow valve feeds the fluid at the unit flow rate by giving first resistance to the fluid when the fluid is pressurized by n pumps of the (n+1) pumps. The constant flow valve feeds the fluid at the unit flow rate by giving second resistance larger than the first resistance to the fluid when the fluid is pressurized by the (n+1) pumps.Type: ApplicationFiled: January 9, 2015Publication date: April 30, 2015Inventor: Kensuke Aoki
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Publication number: 20150069757Abstract: The pneumatic roadway energy recovery system generates electrical power from the weight of vehicles, pedestrians and the like traveling on a roadway surface. The pneumatic roadway energy recovery system includes a plurality of pneumatic pumps in fluid communication with one another and that are arrayed beneath a roadway surface. The pneumatic pumps are in fluid communication with a storage tank. The vehicles, pedestrians and the like traveling on the roadway surface compress the plurality of pneumatic pumps as they pass over the pumps, generating pressurized air, which is received by and stored in the storage tank. Preferably, a turbine, such as a Pelton wheel or the like, is in fluid communication with the storage tank. Selective release of the pressurized air in the storage tank drives the turbine, which, in turn, is connected to an electrical generator for generating usable electrical power.Type: ApplicationFiled: September 9, 2013Publication date: March 12, 2015Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALSInventor: ASHRAF MOHAMED SAMIR FARAHAT
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Patent number: 8956128Abstract: A spherical expansion compressor adapted to variable working conditions with a spherical inner chamber, comprises a rolling rotor compressor used as first-stage compression, compression working chambers, expansion working chambers, a gas tank and a pressure control circuit. The pressure control circuit is between the gas tank and a pressure-controlled inlet valve of the rolling rotor compressor, and controls the inlet valve to open/close according to pressure in the gas tank and maintains constant pressure in the tank. A working medium after first-stage compression enters the gas tank, where the pressure control circuit regulates the gas tank pressure. The working medium enters second-stage compression, and expands in the expansion-stage, forming the spherical expansion compressor adapted to variable working conditions.Type: GrantFiled: July 30, 2010Date of Patent: February 17, 2015Assignee: Xi'An Zhengan Environmental Technology Co., Ltd.Inventors: Luyi Wang, Nan Xia
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Publication number: 20150044071Abstract: A pump arrangement comprising at least one first pump and at least one second pump that can be connected or is connected in series behind the first pump. The pump arrangement has a simple construction, lowest possible pump capacity requirements, and quickly establishes a required pressure or vacuum pressure. This is achieved in that a pump capacity of the first pump or a sum of the pump capacities of the first pumps is much greater than a pump capacity of the second pump and that a bypass with a first overflow valve is connected between the first pump and the second pump.Type: ApplicationFiled: July 17, 2014Publication date: February 12, 2015Inventor: Theodor Hüser
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Publication number: 20150010409Abstract: A membrane vacuum pump includes at least one membrane pump stage, at least one inlet valve for a process gas to be conveyed associated with the membrane pump stage, and at least one gas ballast valve for the supply of a ballast gas. The flow path for the ballast gas, leading through the gas ballast valve, opens into the flow path for the process gas behind the inlet valve in the direction of flow of the process gas.Type: ApplicationFiled: July 1, 2014Publication date: January 8, 2015Inventors: Thorsten BURGGRAF, Juergen WISSNER
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Publication number: 20140301871Abstract: A method and apparatus provides a continuous source of medical grade air. A substantially tubular and rigid housing includes a first end, at least one aperture extending through the housing and positioned a predetermined distance from the first end; and a second end, opposite the first end. A valve extends from the first end of the housing for dispensing medical grade air to a patient. A medical grade air compressor provides medical grade air for output by the valve, the medical grade air compressor being positioned within the housing on a side of the at least one aperture opposite the valve. An air flow generator is positioned between the second end of the housing and the medical grade air compressor, the air flow generator draws air into the housing through the at least one aperture. The air passes over and around the medical grade air compressor to reduce a temperature of the medical grade air compressor and to the medical grade air compressor for generating medical grade air.Type: ApplicationFiled: June 20, 2014Publication date: October 9, 2014Inventor: David Duane Rogers, JR.
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Publication number: 20140193276Abstract: A hand operated reciprocating multistage pump has an upstream stage and a downstream stage, each stage having a compression chamber. A regulating valve controls a mass of compressed air passing from the upstream stage to the downstream stage. By controlling the mass of compressed air passing to the downstream stage, the required force to operate the compression chamber of the downstream stage can be controlled. A sorbent cartridge can be located between the upstream stage and the downstream stage, such that the partially compressed air passes through a sorbent such as a desiccant before being compressed in the compression chamber of the downstream stage.Type: ApplicationFiled: January 9, 2013Publication date: July 10, 2014Applicant: CROSMAN CORPORATIONInventor: Jeffrey Hanson
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Publication number: 20140154099Abstract: A liquid pumping system comprises a plurality of liquid pumps and a hydraulic drive unit. Each liquid pump is driven by a separate hydraulic cylinder. The hydraulic cylinders are powered by a shared hydraulic pump through a valve set. A valve set controller is configured to operate the valve set. A liquid pumping process comprises distributing an initial flow of pressurized hydraulic fluid between the hydraulic cylinders. The hydraulic cylinders move through a cycle in a phased relationship to provide a constant sum of flow rates from the liquid pumps. A membrane filtration system combines the liquid pumping system with a membrane unit. In a water treating process, feed water is pumped through the membrane unit. Brine from the membrane unit is returned to each liquid pump while that liquid pump is feeding water to the membrane unit.Type: ApplicationFiled: December 4, 2012Publication date: June 5, 2014Applicant: General Electric CompanyInventors: Shyam SIVARAMAKRISHNAN, Todd Alan ANDERSON, Matthew David D'ARTENAY, Robert Bruce KINGSLEY
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Patent number: 8668468Abstract: A hydraulic pump system for an automatic transmission has the advantages of preventing excessive power loss and durability deterioration. The hydraulic pump system may include a first hydraulic pump that generates a first hydraulic pressure to supply a low pressure portion with the first hydraulic pump, a second hydraulic pump that receives the first hydraulic pressure to generate a second hydraulic pressure higher than the first hydraulic pressure and supplies a high pressure portion with the second hydraulic pressure, and a drive portion that rotates a drive shaft that integrally connects the first hydraulic pump with the second hydraulic pump.Type: GrantFiled: June 28, 2011Date of Patent: March 11, 2014Assignee: Hyundai Motor CompanyInventor: Jin Young Hwang
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Publication number: 20140064990Abstract: A hydraulic pressure supply system may generate low hydraulic pressure and high hydraulic pressure using oil stored in an oil pan and may supply the low hydraulic pressure and the high hydraulic pressure respectively to a low pressure portion and a high pressure portion in which the hydraulic pressure supply system may include: a low-pressure hydraulic pump; a first switch valve; a low-pressure regulator valve controlling the hydraulic pressure supplied from the first switch valve and supplying the hydraulic pressure to the low pressure portion; a high-pressure hydraulic pump discharging the raised hydraulic pressure to a high-pressure line; a second switch valve disposed between the first low-pressure line and the high-pressure line, a high-pressure regulator valve controlling the hydraulic pressure supplied from the high-pressure hydraulic pump and supplying the stable high hydraulic pressure to the high pressure portion; a bypass line bypassing the first switch valve.Type: ApplicationFiled: December 12, 2012Publication date: March 6, 2014Applicant: Hyundai Motor CompanyInventors: Se Hwan JO, Jin Young Hwang, Taehwan Wi
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Patent number: 8596991Abstract: A multiple stage pump for delivering fuel to an engine is disclosed which includes a pump housing, a boost stage operable at engine start to draw fuel into the pump housing at a boost stage pressure, a first pumping stage operable upon engine start for receiving fuel from the boost stage and delivering the fuel from the pump housing to a fuel metering unit, a second pumping stage operable upon engine start and during engine cruise operation for receiving fuel from the boost stage and delivering the fuel from the pump housing to said fuel metering unit, and a switching valve in fluid communication with the first and second pumping stages, and configured to control fuel flow through the first pumping stage in dependence on changes in boost stage conditions such as pressure or shaft speed.Type: GrantFiled: February 11, 2011Date of Patent: December 3, 2013Assignee: Triumph Engine Control Systems, LLCInventor: William H. Dalton
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Patent number: 8366406Abstract: A multi-stage compressor is provided that reliably prevents liquid compression in a higher stage compression mechanism and also prevents compression efficiency degradation resulting from overheating of injection refrigerant and from the lubricating oil being raised up together with the injection refrigerant. An injection circuit is branched into a plurality of circuits. A first circuit thereof is communicatively connected to an inside space of a closed housing that is at the same side as the higher stage compression mechanism with respect to an electric motor, and a second circuit is communicatively connected to an inside space of the closed housing that is opposite from the higher stage compression mechanism with respect to the electric motor. The first circuit and the second circuit are provided with a switching mechanism for switching the injection circuit to the first circuit or the second circuit according to the dryness of the injection refrigerant.Type: GrantFiled: July 24, 2008Date of Patent: February 5, 2013Assignee: Mitsubishi Heavy Industries, Ltd.Inventors: Hajime Sato, Yoshiyuki Kimata
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Publication number: 20120304993Abstract: A pump unit can achieve significant size reduction while maintaining the performance thereof. Micropumps are arranged in a lattice pattern with rows and columns, and a discharge port of at least a micropump arranged in the most downstream row is directly connected to an integrated discharge port. The pump unit further includes: a discharge direct-connection mechanism for connecting respective discharge ports of a plurality of micropumps in a middle row directly to the integrated discharge port; an intake direct-connection mechanism for connecting respective intake ports of the micropumps directly to a fluid to be supplied first; a series-connection mechanism for connecting a discharge port of a micropump in an upstream row directly to an intake port of a micropump in a downstream row; and a controller for controlling the discharge direct-connection mechanism, the intake direct-connection mechanism, and the series-connection mechanism.Type: ApplicationFiled: January 9, 2012Publication date: December 6, 2012Inventors: Kazufuku NITTA, Jun Nitta
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Patent number: 8308439Abstract: A method of operating a multistage gas compressor system including providing a plurality of compressor stages connected in series, receiving a gas flow having contaminants within a gas passage, and supplying solvent to the gas passage at or upstream of a compressor in a compressor stage of the plurality of compressor stages to entrap or dissolve the contaminants in the gas flow. The method includes resisting disabling fouling of the compressor in the compressor stage from any contaminants entrapped or dissolved in the solvent, for example, by controlling a discharge temperature of the compressor, and/or using a type of compressor that is not susceptible to being disabled by fouling in at least the first stage. The discharge temperature can be controlled by providing the compressor with a pressure ratio selected to provide a desired discharge temperature.Type: GrantFiled: July 20, 2007Date of Patent: November 13, 2012Assignee: Lummus Technology Inc.Inventors: Franklin D. Lomax, Jr., Christopher P. Heinrichs, James E. Shaffer
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Patent number: 8277197Abstract: A multi-stage compression installation is formed of a main pipe (2) emerging in a baffle plate (3), where at least two compressors (4, 5) are mounted in series each having its own drive member (9, 10). The installation is equipped with a system for determining the pressure at the output of the main pipe (2), the installation being connected to a control box (8). Typically, the control box (8) is connected to at least two of the drive members (9, 10) of the compressors (4, 5) and ensures monitoring of the compressors such that the latter rotate jointly whether charged or uncharged. Thus, the compressors (4, 5) are jointly charged based on the pressure prevailing in the baffle plate (3), such that the charging of the compressor representing the overpressure stage, the compressor(s) of the lower compression stages are automatically and jointly charged.Type: GrantFiled: September 1, 2006Date of Patent: October 2, 2012Assignee: Atlas Copco Crepelle S.A.S.Inventors: Patrick Marcel Augustin Lelong, Hans Theo Magits
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Publication number: 20120207626Abstract: A multiple stage pump for delivering fuel to an engine is disclosed which includes a pump housing, a boost stage operable at engine start to draw fuel into the pump housing at a boost stage pressure, a first pumping stage operable upon engine start for receiving fuel from the boost stage and delivering the fuel from the pump housing to a fuel metering unit, a second pumping stage operable upon engine start and during engine cruise operation for receiving fuel from the boost stage and delivering the fuel from the pump housing to said fuel metering unit, and a switching valve in fluid communication with the first and second pumping stages, and configured to control fuel flow through the first pumping stage in dependence on changes in boost stage conditions such as pressure or shaft speed.Type: ApplicationFiled: February 11, 2011Publication date: August 16, 2012Applicant: GOODRICH PUMP & ENGINE CONTROL SYSTEMS, INC.Inventor: William H. Dalton
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Publication number: 20120189468Abstract: A multi-stage diaphragm suction pump, comprising at least two pump chambers, each having a fluid inlet having at least one inlet valve, and a fluid outlet having at least one outlet valve, and a suction line, which connects the fluid inlets of the pump chambers. Consecutive pump chambers are connected to each other by at least one connection line such that, when a differential pressure in the suction line is reached/exceeded, the diaphragm pump changes from parallel operation of the pump chambers thereof to an operating mode of the pump chambers that is at least also serial. At least one check valve, which opens to the downstream pump stage, is interposed in each of the inflow and outflow regions of the at least one connection line.Type: ApplicationFiled: August 18, 2010Publication date: July 26, 2012Applicant: KNF NEUBERGER GMBHInventors: Erich Becker, Erwin Hauser
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Publication number: 20120141302Abstract: A hydraulic pump system for an automatic transmission has the advantages of preventing excessive power loss and durability deterioration. The hydraulic pump system may include a first hydraulic pump that generates a first hydraulic pressure to supply a low pressure portion with the first hydraulic pump, a second hydraulic pump that receives the first hydraulic pressure to generate a second hydraulic pressure higher than the first hydraulic pressure and supplies a high pressure portion with the second hydraulic pressure, and a drive portion that rotates a drive shaft that integrally connects the first hydraulic pump with the second hydraulic pump.Type: ApplicationFiled: June 28, 2011Publication date: June 7, 2012Applicant: Hyundai Motor CompanyInventor: Jin Young Hwang
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VEHICLE COMPRISING AN AIR COMPRESSOR SYSTEM AND METHOD FOR OPERATING A VEHICLE AIR COMPRESSOR SYSTEM
Publication number: 20110231047Abstract: A vehicle includes an air compressor system for supplying compressed air to an air consuming circuit, wherein the vehicle includes an arrangement for determining that the vehicle is coasting. The compressor system is controllable to deliver compressed air at a first power rate and at least at a second higher power rate, and it is controlled to deliver compressed air at the second higher power rate when it is determined that the vehicle is coasting. A method for operating an air compressor system for such a vehicle is also provided.Type: ApplicationFiled: November 28, 2008Publication date: September 22, 2011Applicant: RENAULT TRUCKSInventors: Luc Aixala, Christophe Long, Philippe Le Brusq -
Publication number: 20110116939Abstract: A first and a second rotary pumps are provided in a first pump casing of a pump body, which is inserted into a cylindrical recessed portion of a housing 101. A first outlet port is opened at a first space formed between a bottom surface of the cylindrical recessed portion and an axial forward end surface of the first pump casing, so that discharge pressure of working fluid of the first pump is supplied to the first space. A second outlet port is opened at a second space formed between an axial backward end surface of the first pump casing and an axial forward end surface of a second pump casing, so that discharge pressure of working fluid of the second pump is supplied to the second space.Type: ApplicationFiled: November 17, 2010Publication date: May 19, 2011Applicant: ADVICS CO., LTD.Inventors: Tomoaki KAWABATA, Kunihito Ando
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Patent number: 7882832Abstract: Various embodiments of a fluid displacement system are disclosed. The system may include a reservoir containing a fluid in a liquid state and a first chamber hydraulically connected to the reservoir to receive the fluid from the reservoir. The first chamber may be configured to receive solar energy and configured to convert the received solar energy to vaporize the fluid. The system may also include a second chamber hydraulically connected to the first chamber to receive the vaporized fluid from the first chamber. The second chamber may be configured to condense the vaporized fluid, causing depressurization in the second chamber. The system may also include a hydraulic connection between the second chamber and a source of fluid to be displaced. The system may be configured such that the depressurization of the second chamber may cause fluid in the source of fluid to be displaced through the hydraulic connection.Type: GrantFiled: July 20, 2005Date of Patent: February 8, 2011Inventor: Claudio Filippone
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Publication number: 20100258196Abstract: A method and apparatus for delivering process materials in a bulk delivery system includes a plurality of pumps arranged in series along a material supply line, wherein the capacity of each pump is such that less than all of the pumps operating simultaneously can provide a desired level of system performance for a given application. In at least one preferred embodiment, a plurality of pumps include three pumps are arranged in series. Preferred embodiments provide several benefits over a parallel arrangement of two larger pumps including, in the case of a single pump failure, that the remaining pumps are signaled to increase speed to restore system performance to restore supply line pressure with less perturbation than that realized in a two-pump, parallel arranged system. Methods are also provided herein for determining which of the three pumps is a failed pump in such a case.Type: ApplicationFiled: April 14, 2010Publication date: October 14, 2010Applicant: MEGA FLUID SYSTEMS, INC.Inventors: Chris MELCER, Jamie A. GRAVES, Bryan FLETCHER, Koh I. MURAI, David D. KANDIYELI
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Publication number: 20100064707Abstract: A multi-stage compressor is provided that reliably prevents liquid compression in a higher stage compression mechanism and also prevents compression efficiency degradation resulting from overheating of injection refrigerant and from the lubricating oil being raised up together with the injection refrigerant. An injection circuit is branched into a plurality of circuits. A first circuit thereof is communicatively connected to an inside space of a closed housing that is at the same side as the higher stage compression mechanism with respect to an electric motor, and a second circuit is communicatively connected to an inside space of the closed housing that is opposite from the higher stage compression mechanism with respect to the electric motor. The first circuit and the second circuit are provided with a switching mechanism for switching the injection circuit to the first circuit or the second circuit according to the dryness of the injection refrigerant.Type: ApplicationFiled: July 24, 2008Publication date: March 18, 2010Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Hajime Sato, Yoshiyuki Kimata
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Publication number: 20090068024Abstract: A progressing cavity pump heat management system including a progressing cavity pump and a controller. The controller is configured to receive data relating to the temperature of materials exiting the pump and the differential pressure across the pump to determine whether corrective action is required. The controller is configured such that if the controller determines that corrective action is required, the controller institutes corrective action to seek to reduce at least one of the temperature of materials exiting the pump or differential pressure across the pump.Type: ApplicationFiled: August 14, 2008Publication date: March 12, 2009Inventors: Michael Duane Amburgey, Mark E. Bosh, Todd E. Brown
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Patent number: 7481628Abstract: A diaphragm pump for pumping a fluid includes a housing, a pump chamber defined in the housing, a first diaphragm for sealing the pump chamber, a pressure control chamber defined in the housing adjacent to the pump chamber via the first diaphragm, a second diaphragm for sealing the pressure control chamber, a drive mechanism operable to deform the first and second diaphragms, an introduction passage for introducing into the pressure control chamber a part of the fluid that is discharged from the pump chamber, and a pressure regulating valve disposed in the introduction passage for adjusting a pressure in the pressure control chamber to a medium pressure between a suction pressure and a discharge pressure.Type: GrantFiled: February 27, 2006Date of Patent: January 27, 2009Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Shinya Yamamoto, Makoto Yoshikawa, Takao Mishina
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Publication number: 20090022602Abstract: A method of operating a multistage gas compressor system including providing a plurality of compressor stages connected in series, receiving a gas flow having contaminants within a gas passage, and supplying solvent to the gas passage at or upstream of a compressor in a compressor stage of the plurality of compressor stages to entrap or dissolve the contaminants in the gas flow. The method includes resisting disabling fouling of the compressor in the compressor stage from any contaminants entrapped or dissolved in the solvent, for example, by controlling a discharge temperature of the compressor, and/or using a type of compressor that is not susceptible to being disabled by fouling in at least the first stage. The discharge temperature can be controlled by providing the compressor with a pressure ratio selected to provide a desired discharge temperature.Type: ApplicationFiled: July 20, 2007Publication date: January 22, 2009Applicant: H2GEN INNOVATIONS, INC.Inventors: Franklin D. Lomax, JR., Christopher P. Heinrichs, James E. Shaffer
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Patent number: 7401623Abstract: A hydraulic system includes a charge pump which supplies fluid to variable displacement main pump, a fluid reservoir and valve unit. The valve unit includes a hollow housing having a first end communicated with the reservoir and a second end communicated with the charge pump and the main pump. A housing valve land member is located between the first and second ends. A valve member is movably mounted in the housing. The valve member has a valve disk attached to first and second valve stems which project from opposite sides of the valve disk. The valve disk has a central position wherein the valve disk is received by the ring. The valve stems are slidably supported by stem support members at opposite ends of the housing. A hollow sleeve projects from an end of the valve unit. A spring is mounted in the sleeve and is engagable with an end of one of the valve stems and is biased to urge the valve member away from the sleeve.Type: GrantFiled: January 20, 2006Date of Patent: July 22, 2008Assignee: Deere & CompanyInventors: Phillip S. Roe, Robert Clayton Emmert
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Patent number: 7377755Abstract: A multi-stage rotary compressor to reduce a driving load and prevent a malfunction due to an abrupt pressure rising. In the compressor of the type including first and second compressing units mounted in a hermetic casing thereof to compress a gas, the gas being primarily compressed in the first compressing unit and secondarily compressed in the second compressing unit, the interior of the hermetic casing is divided into a plurality of spaces including first and second pressure chambers. The first pressure chamber surrounds the first compressing unit and is kept at a discharge pressure of the first compressing unit, and the second pressure chamber surrounds the second compressing unit and is kept at a discharge pressure of the second compressing unit.Type: GrantFiled: July 25, 2005Date of Patent: May 27, 2008Assignee: Samsung Electronics Co., Ltd.Inventor: Sung Oug Cho
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Patent number: 7048000Abstract: A pressure reducing valve includes a housing having a passage therein, a valve body disposed within the passage, and a piston slideably disposed within the passage. The valve body includes a wall arranged transverse to the passage and dividing the passage into an input side and an output side, the wall having a plurality of openings passing therethrough, a portion of the wall between the openings and facing the output side defining a sealing surface. The piston includes a channel passing longitudinally therethrough with a sealing ledge surrounding the channel on a first end, a flange surrounding the channel on a second end, and an annular shoulder surrounding the sealing ledge. Fluid pressure at the input side acts on the shoulder and biases the piston toward the output side and fluid pressure at the output side acts on the flange and biases the piston toward the input side.Type: GrantFiled: March 3, 2004Date of Patent: May 23, 2006Assignee: Haldex Brake CorporationInventor: Robert L. Koelzer
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Patent number: 6997685Abstract: The invention relates to a hydraulic system (1) comprising a main pump (12) and a precompression pump (5), whereby the outlet (8) of the precompression pump (5) is connected by a connecting line (9) to the inlet (11) of the main pump (12). The outlet (16) of the main pump (12) can be connected by a working line (17) to a consumer (A, B). The volume flow at the inlet (11) of the main pump (12) is changeable. The aim of the invention is to achieve greater efficiency. The precompression pump (5) comprises an adjusting device (6) for adjusting the flow rate.Type: GrantFiled: June 29, 2001Date of Patent: February 14, 2006Assignee: Brueninghaus Hydromatik GmbHInventor: Ralf Lemmen
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Patent number: 6817839Abstract: A multistage device (1) for delivering moist gases is provided. Said device comprises several delivery pumps (2, 3) each of which having a displacer that oscillates inside a delivery space, and being connected in series via a connection channel (6). The inventive device also comprises a ventilation device (7) which has at least one ventilation channel (8), whereby the ventilation channel (8) opens into a connection channel (6) that interconnects series-connected delivery pumps (2, 3). The inventive device (1) is characterized in that a ventilation valve (9), which can be motor-actuated by a control device, is interconnected inside the ventilation channel (8), and said ventilation valve (9) can be actuated as required by means of the control device and independent of the lift position of the displacers.Type: GrantFiled: November 4, 2002Date of Patent: November 16, 2004Assignee: KNF Neuberger GmbHInventor: Erwin Hauser
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Patent number: 6739841Abstract: An oil free screw compressor having a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided in a pipe branching off midway an air pipe connecting between the high-pressure stage compressor body and the low-pressure stage compressor body, and a high-pressure stage blow-off two-way valve is provided in a pipe branching off from a discharge air pipe provided on a discharge side of the high-pressure stage compressor body. During no-load operation, a controller gives a command to the inverter to make the rotational speed of the motor a set lower limit rotational speed, and also gives an open command to the low-pressure stage blow-off two-way valve.Type: GrantFiled: March 18, 2003Date of Patent: May 25, 2004Assignee: Hitachi, Ltd.Inventors: Hitoshi Nishimura, Hiroshi Ohta
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Patent number: 6695591Abstract: A multi-stage compressor comprises a gas compressor, a centrifugal blower having an input connected with a gas source and an output connected with the gas compressor and providing a flow of compressed gas as a first stage of compression to the gas compressor, and a power source mechanically connected with and driving both the centrifugal blower and gas compressor to provide multi-stage compression of said gas.Type: GrantFiled: May 20, 2002Date of Patent: February 24, 2004Assignee: Grimmer Industries, Inc.Inventors: John E. Grimmer, Edward T. Ketcham
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Patent number: 6638029Abstract: A two-stage oil free compressor assembly includes a pressure modulation mechanism, which enhances the ambient temperature and altitude capability of the compressor. A selected amount of pressurized fluid is drawn from an output side of a second stage compressor portion and reintroduced into the lower pressure interstage circuit of the assembly, thus raising the interstage pressure. The fluid that flows through the pressure modulation mechanism can be further cooled using the interstage heat exchanger, depending on the needs of a particular situation. A valve in the pressure modulation mechanism is adjusted to control the amount of fluid utilized for pressure modulation. The inventive arrangement permits modulating the pressure ratio of each stage to achieve reasonably balanced discharge temperatures of the first and second stage.Type: GrantFiled: December 19, 2001Date of Patent: October 28, 2003Assignee: Hamilton Sunstrand CorporationInventor: John Kharsa
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Publication number: 20030180150Abstract: An oil free screw compressor having a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided in a pipe branching off midway an air pipe connecting between the high-pressure stage compressor body and the low-pressure stage compressor body, and a high-pressure stage blow-off two-way valve is provided in a pipe branching off from a discharge air pipe provided on a discharge side of the high-pressure stage compressor body. During no-load operation, a controller gives a command to the inverter to make the rotational speed of the motor a set lower limit rotational speed, and also gives an open command to the low-pressure stage blow-off two-way valve.Type: ApplicationFiled: March 18, 2003Publication date: September 25, 2003Inventors: Hitoshi Nishimura, Hiroshi Ohta
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Publication number: 20030123997Abstract: A multistage device (1) for delivering moist gases is provided. Said device comprises several delivery pumps (2, 3) each of which having a displacer that oscillates inside a delivery space, and being connected in series via a connection channel (6). The inventive device also comprises a ventilation device (7) which has at least one ventilation channel (8), whereby the ventilation channel (8) opens into a connection channel (6) that interconnects series-connected delivery pumps (2, 3). The inventive device (1) is characterized in that a ventilation valve (9), which can be motor-actuated by a control device, is interconnected inside the ventilation channel (8), and said ventilation valve (9) can be actuated as required by means of the control device and independent of the lift position of the displacers.Type: ApplicationFiled: November 4, 2002Publication date: July 3, 2003Inventor: Erwin Hauser
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Patent number: 6572350Abstract: A package-type screw compressor includes a low-pressure stage state compressor and a high-pressure stage compressor. Motive power is transmitted from an electric motor to the two compressors via a speed increaser. The discharge gas, compressed and heated to a high temperature by the low-pressure stage compressor, is cooled by an intercooler. The discharge gas, compressed and heated to a high temperature by the high-pressure stage compressor, is cooled by an aftercooler. A casing of the intercooler and that of the aftercooler are formed integrally with a speed increaser casing, reducing the number of component parts. A cooler portion, formed by the intercooler and the aftercooler, is spaced from the speed increaser casing, thereby preventing heat, produced by the compressed air, from being transmitted to the speed increaser casing.Type: GrantFiled: February 25, 2002Date of Patent: June 3, 2003Assignee: Hitachi, Ltd.Inventors: Kazuki Takahashi, Seiji Tsuru, Minoru Taniyama, Haruo Miura
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Patent number: 6561766Abstract: An oil free screw compressor includes a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided in a pipe branching off midway an air pipe connecting between the high-pressure stage compressor body and the low-pressure stage compressor body, and a high-pressure stage blow-off two-way valve is provided in a pipe branching off from a discharge air pipe provided on a discharge side of the high-pressure stage compressor body. During no-load operation, a controller gives a command to the inverter to make the rotational speed of the motor a set lower limit rotational speed, and also gives an open command to the low-pressure stage blow-off two-way valve.Type: GrantFiled: March 29, 2001Date of Patent: May 13, 2003Assignee: Hitachi, Ltd.Inventors: Hitoshi Nishimura, Hiroshi Ohta
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Patent number: 6129518Abstract: An on-off valve is connected between a high-pressure pump and a low-press pump and is sized to be rapidly activated during the cranking stage of an internal combustion engine. After actuating the on-off valve, surplus fuel is drained into an inner chamber of the high pressure pump. A solenoid valve is further provided between the low-pressure pump and the on-off valve to automatically cut off the supply of fuel to the on-off valve in the event of an engine failure. The apparatus is beneficial to reduce variation in the fuel supply of the low pressure pump during engine start-up and steady-state operation.Type: GrantFiled: December 19, 1997Date of Patent: October 10, 2000Assignee: Elasis Sistema Ricerca Fiat Nel Mezzogiorno Societa Consortile per AzioniInventor: Mario Ricco
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Patent number: 6105829Abstract: A fluid dispensing system is provided which has a first diaphragm pump, a filter connected to receive the discharge of said first pump, and a accumulator/second diaphragm pump connected to receive the discharge of said filter. Hydraulic fluids pumped by cylinder/piston/stepper assemblies independently actuate each of the diaphragm pumps, providing accurate, controllable and repeatable dispense of the subject fluid.Type: GrantFiled: June 29, 1998Date of Patent: August 22, 2000Assignee: Millipore Investment Holdings, Ltd.Inventors: Ocie T. Snodgrass, Michael K. Farney, Gregory M. Gibson
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Patent number: 6089830Abstract: A multiple stage rotary compressor having a housing with a pump cavity and an orbiting ring piston in the cavity. A cylindrical post carried by the housing within the orbiting ring. A pair of vanes engaging the outer surface of the orbiting ring to define first-stage having a pair of primary pumping chambers in the cavity. A second pair of internal vanes contacting the inner surface of the orbiting ring to define a second-stage having a pair of secondary pumping chambers. A capacity control mechanism applied to the first-stage operative to limit the compressor capacity to the second-stage only. A second capacity control mechanism applied to the second-stage operative to variably bypass second-stage discharge to second-stage suction. The plurality of capacity controllers operating to establish varying compressor pump capacity depending upon the operating requirements of the compressor.Type: GrantFiled: February 2, 1998Date of Patent: July 18, 2000Assignee: Ford Global Technologies, Inc.Inventors: Shane Anthony Harte, Lavlesh Sud, Ronald J. Mangiapane, Guntis Viktors Strikis
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Patent number: 6079952Abstract: A control strategy for a multiple stage rotary compressor having compressive capacity output based on the demand of an air conditioning system. The constant variance in capacity to meet demand is obtained by recirculation of the multiple stages. Capacity is reduced to less than full capacity by recirculating the output of each stage back to the input of that particular stage. Capacity is increased up to full capacity by decreasing recirculation of the output of each stage back to the input of that particular stage. Additional stages and or portions operate in the same manner and provide further recirculation variability to provide a recirculation schedule based on demand.Type: GrantFiled: February 2, 1998Date of Patent: June 27, 2000Assignee: Ford Global Technologies, Inc.Inventors: Shane Anthony Harte, Lavlesh Sud, Yong Huang
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Patent number: 6012904Abstract: A main fuel tank in an automotive vehicle contains a reservoir in which is located a two-stage electrically operated pump. The first stage is a rotary side lateral pump which draws fuel from the main tank and delivers it to the reservoir. The second stage is a rotary turbine pump which draws fuel from the reservoir and delivers it to the vehicle engine. The reservoir has overflow restriction means which allows air to vent while the reservoir is filling with fuel but which restricts fuel flow when the reservoir is full. This creates pressure in the reservoir to create back pressure against and shut down fuel flow from the first stage pump and also increase pressure on the fuel inlet of the second stage pump thus increasing the efficiency of the second stage fuel pump.Type: GrantFiled: April 21, 1995Date of Patent: January 11, 2000Assignee: Walbro CorporationInventor: Charles H. Tuckey
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Patent number: 5878790Abstract: A recovery system for recovering hydrocarbon vapor given off by motor vehicle tanks while they are being filled with liquid fuel via at least one dispensing pipe. According to the invention, said recovery system comprises a recovery pipe associated with said dispensing pipe, a power pump placed on said recovery pipe, and a metering pump driven by a motor at an angular velocity that is substantially proportional to the volume flow rate of liquid fuel delivered by the dispensing pipe, said metering pump being mounted in series with said power pump via a differential pressure expander-regulator suitable for maintaining a pressure difference that is small between the outlet and the inlet of the metering pump so as to obtain a vapor volume flow rate that is substantially proportional to the angular velocity imparted by said motor. Application to dispensing liquid fuel.Type: GrantFiled: March 4, 1997Date of Patent: March 9, 1999Assignee: Schlumberger IndustriesInventor: Sylvain Janssen
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Patent number: 5865601Abstract: A safety device for avoiding entrapment at a water reservoir drain by using a vacuum operated switch to interrupt power to the reservoir pump and by using a pressure pump to generate a positive pressure to dislodge the obstruction from the drain should a blockage occur. In addition, a manual reset switch requires human intervention to re-activate the reservoir pump once the blockage condition is removed.Type: GrantFiled: February 6, 1998Date of Patent: February 2, 1999Inventor: Bernard J. Miller