Valved Clearance Chamber Patents (Class 417/275)
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Patent number: 11692535Abstract: An air compressor more reliably protects a battery pack without lowering its operability for attachment to and detachment from a battery mount. The air compressor includes an electric motor driven on power from a battery pack having six faces, an operation unit operable to connect or disconnect power to the electric motor, an compression unit driven by the electric motor to produce compressed air, a tank that stores the compressed air, a battery mount that receives an attachment face of the battery pack, and a guard defining a protective area to contain the battery pack and the compression unit. The battery pack is attachable to the battery mount with at least three of the six faces exposed.Type: GrantFiled: June 22, 2021Date of Patent: July 4, 2023Assignee: MAKITA CORPORATIONInventors: Noriyuki Nishido, Yasuhiro Morioka
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Patent number: 10047740Abstract: A pump unit includes a pump housing having a low-pressure inlet and a high-pressure outlet. A working medium is fed via the low-pressure inlet to a working chamber formed in the pump housing. The working medium is discharged from the working chamber via the high-pressure outlet. The pump unit also includes a pump piston channel formed in the pump housing and having a longitudinal axis. The pump unit has a first pump piston arranged movably along the longitudinal axis in the pump piston channel and coupled hydraulically to the working chamber. The pump unit also has a second pump piston arranged movably along the longitudinal axis in the pump piston channel and coupled hydraulically via a compensation volume to the first pump piston, wherein the compensation volume is coupled hydraulically to a compensation unit configured to adapt the compensation volume based on a pressure in the working chamber.Type: GrantFiled: January 30, 2012Date of Patent: August 14, 2018Assignee: CONTINENTAL AUTOMOTIVE GMBHInventors: Michael Absmeier, Xaver Gebhardt, Anatoliy Lyubar, Danica Stegemann
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Patent number: 9039387Abstract: A supercharged compressor and method of operating the compressor supplies a commercial vehicle with compressed air. The compressor includes a piston chamber, a dead space or clearance volume and a valve unit for switching the clearance volume. The valve element is configured such that the air volume supplied by the supercharged compressor can be reduced to a value that is different from zero by activating the clearance volume.Type: GrantFiled: April 28, 2010Date of Patent: May 26, 2015Assignee: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbHInventor: Joerg Mellar
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Publication number: 20150004013Abstract: A security system for a pneumatic accumulator, the pneumatic accumulator being connectable with a pump and with a pneumatic apparatus by, respectively, a first and second connecting duct is described. The security system has a) a pneumatic bladder for containing high pressure gas, and b) flow distribution means connected with the first and second connecting ducts to the pneumatic accumulator and the pneumatic bladder, the flow distribution means being able to pass from a first operating position to a second operating position, in which the flow distribution means connects the first and second connecting ducts with the pneumatic bladder (40) pneumatic plant is also described.Type: ApplicationFiled: August 31, 2012Publication date: January 1, 2015Inventor: Giacomo Giovangrossi
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Patent number: 8272835Abstract: A gas turbine engine comprising of a turbine blade, an adjustable casing, and a clearance control arrangement. The clearance control arrangement further comprises an actuator operatively connected to a piston within a cylinder wherein the piston divides the cylinder by a sealing engagement with a wall of the cylinder into a first volume and a second volume. The first volume is operatively connected to a first piezo electric pump that increases a pressure in the first volume, and the second volume is operatively connected to a second piezo electric pump that increases a second pressure in the second volume, such that the relative displacement of the piston is determined by a pressure balance between the first and second pressure.Type: GrantFiled: May 28, 2009Date of Patent: September 25, 2012Assignee: Rolls-Royce PLCInventor: Colin D. Smith
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Publication number: 20100003125Abstract: With regard to gas turbine engines it is necessary to maintain clearance between a rotating blade assembly and a casing to maintain efficiency. Thermal expansion and other factors are transients mean it is advantageous to provide active adjustment. By utilisation of piezo electric pumps 51, 52 operable at relatively high predetermined temperatures with a piston 54 and a cylinder 53 to cause displacement of an actuator 58 rapid adjustment is achieved. The cylinder 53 is divided into a first volume 55 and a second volume 56 so that each piezo electric pump 51, 52 can pressurise one volume 55, 56. A pressure balance is created across the piston 54 in order to position the associated actuator 58. A vent valve 67 can be used to effectively suspend the pressure balance across the piston 54 between the volumes 55, 56 for rapid displacement.Type: ApplicationFiled: May 28, 2009Publication date: January 7, 2010Applicant: ROLLS-ROYCE PLCInventor: Colin D. Smith
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Patent number: 6797063Abstract: Described are dispensing apparatuses and methods of their use, the dispensing apparatuses having one or more process chamber inside of a control chamber, and the volume of the process chamber increases or decreases by adding or removing control fluid from the control chamber, with proper valving, to cause fluid to flow into and out of the process chamber, for use in dispensing fluid, especially in precise amounts.Type: GrantFiled: September 26, 2002Date of Patent: September 28, 2004Assignee: FSI International, Inc.Inventor: Kader Mekias
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Patent number: 6257838Abstract: A gas compressor for vehicle braking systems controlled by compressed air can be operated under load or in idle operation. In idle operation, no compressed air is produced. In operation under load, the gas compressor produces compressed air as required by the pressure medium installation. During prolonged operation of the gas compressor at a relatively high operating speed, for example, during travel on super-highways, the power consumption can be decreased and thereby also the production amount of the gas compressor, without having to switch the gas compressor over into idle operation. A clearance volume of less volume than the nominal volume of the gas compressor is provided which can be connected via a valve to the compression chamber of the gas compressor, thereby making it possible to enlarge the compression volume. In addition, a process for the control of the auxiliary valve takes into account different operating magnitudes of the gas compressor and other elements of the vehicle.Type: GrantFiled: October 15, 1999Date of Patent: July 10, 2001Assignee: WABCO GmbHInventors: Heinrich Schlossarczyk, Karl-Heinrich Schõnfeld, Jens Tiedemann
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Patent number: 6095762Abstract: An inflator mechanism has a valve adapted to secure with the device to be inflated. A compressor is fluidly coupled with the valve mechanism. The compressor mechanism generates fluid to inflate the device. The compressor mechanism includes a motor to drive a piston, a piston, a piston cylinder, an outlet coupled between the piston cylinder and the valve, and a housing. A biasing spring is positioned in the housing to exert a force on the cylinder. The biasing force maintains the cylinder in a first position when the fluid in the cylinder is at a low pressure. The cylinder moves in the housing against the force of the biasing spring to a second position when the fluid in the cylinder is at a high pressure. A displacement control valve is associated with the cylinder to control the fluid displacement of the compressor. Thus, at low pressure, fluid displacement is high and as pressure in the cylinder increases, the fluid displacement is reduced. A power source is coupled to drive the motor of the compressor.Type: GrantFiled: August 8, 1997Date of Patent: August 1, 2000Assignee: Black & Decker Inc.Inventor: Thomas J. Wheeler
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Patent number: 6056517Abstract: A compressor for an air-conditioning system of a motor vehicle is proposed, which has a controllable compression medium feed mechanism powered by a drive shaft and which, for example, is powered by the combustion engine of the motor vehicle by a belt driven by a drive shaft, where the belt is coupled with the drive shaft of the compressor. the compressor is characterized by the drive wheel (29) having a belt pully body (31) engaged with the belt (33) and coupled via an elastic coupling element (35) with the drive shaft (7), and by the drive shaft (7) being equipped with a torque limiting mechanism (predetermined fracture point (65)). In the case of another version, it is envisaged that the support mechanism (127) contains a projection (137) protruding from the take-up plate (11) and preferentially forming a single piece with this, as well as a supporting element (139).Type: GrantFiled: March 3, 1998Date of Patent: May 2, 2000Assignee: LuK Fahrzeug-Hydraulik GmbH & Co. KGInventors: Frank Obrist, Jan Hinrichs, Peter Kuhn, Hans-Jurgen Lauth
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Patent number: 5735675Abstract: A combination compressor unloader which has a horizontal cylinder and a double acting piston forming two compression chambers. Each chamber communicates by a passageway with a supplementary chamber with each passageway associated with a reversible actuator having an attached unloader plug capable of sealing the passageway from a remote control. A second means is provided to form a reversible by pass that can deactivate at least one cylinder end of said double ended piston.Type: GrantFiled: July 25, 1995Date of Patent: April 7, 1998Inventors: Richard Claude Peoples, Daniel Lee Umbaugh
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Patent number: 5368451Abstract: An apparatus for pumping fluid at a substantially constant flow rate, is disclosed. The apparatus contains three transducers which couple one hydraulic fluid to another fluid while preventing contact with said other fluid. The apparatus also contains a timing device for continuously and sequentially withdrawing hydraulic fluid from the first fluid transducer while simultaneously pumping hydraulic fluid to the second fluid transducer, thereafter withdrawing hydraulic fluid from the second fluid transducer while simultaneously pumping hydraulic fluid to the third fluid transducer means, and thereafter withdrawing hydraulic fluid from the third fluid transducer. The timing means preferably includes a plurality of hydraulic cylinders and pistons, and a cam assembly.Type: GrantFiled: November 6, 1992Date of Patent: November 29, 1994Inventor: John M. Hammond
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Patent number: 5141413Abstract: The compressor has a straight cylinder wholly confined within which are inlet valves, and reciprocatable discharge valves. One inlet valve is set in place by a centerbolt which can be turned by a wrench (or the like) to move the inlet valve to selected positions relative to its confronting discharge valve, whereby the volume of the clearance pocket is varied. The centerbolt mounted inlet valve, then, comprises an instrument for selectively varying the clearance pocket volume, obviating any need for any special clearance pocket varying devices or components.Type: GrantFiled: September 26, 1991Date of Patent: August 25, 1992Assignee: Dresser-Rand CompanyInventor: Robert A. Bennitt
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Patent number: 5049040Abstract: A variable capacity compressor in which each compression chamber has a reexpansion chamber the volume of which is selectively controlled by pressurized lubricant.Type: GrantFiled: October 12, 1989Date of Patent: September 17, 1991Assignee: Copeland CorporationInventors: Tariq A. R. Diab, Jerry L. Miller, Earl B. Muir
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Patent number: 4737080Abstract: A valve assembly is provided which includes a seat structure and a cage structure. A valve member is movable between open and closed positions and includes an upstream side adapted to engage the seat structure with the valve member in its closed position and a downstream side connected to the cage struture. The cage structure includes a manifold communicating with the valve member downstream side. A pilot valve is provided for selectively venting the manifold to an area of low fluid pressure whereby the valve member is held in its open position.Type: GrantFiled: November 17, 1986Date of Patent: April 12, 1988Assignee: Ball Valve CompanyInventors: Herbert B. Owsley, Lauren D. Sperry, James S. Bunn
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Patent number: 4502844Abstract: A reciprocating piston type refrigerant compressor is disclosed which includes a compressor housing having a cylinder block provided with a plurality of cylinders and a crank chamber adjacent the cylinder block. A piston slides within each cylinder and is reciprocated by a wobble plate driven by a cam rotor. A drive shaft is connected to the cam rotor to drive the cam rotor. A front end plate is disposed on an opening of the crank chamber; the front end plate rotatably supports the drive shaft. A rear end plate is fixed on the opposite end of the compressor housing together with a valve plate which includes a suction chamber and a discharge chamber. The rear end plate is provided with a plurality of dead space chambers, each of which is connected with one of the cylinders through a hole formed through the valve plate. A valve is slidably disposed within the dead space chamber to control the opening and closing of the hole in the valve plate.Type: GrantFiled: October 20, 1982Date of Patent: March 5, 1985Assignee: Sanden CorporationInventors: Shogo Kimura, Haruo Takahashi
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Patent number: 4486148Abstract: A method of controlling a motive power and fluid driving system according to the present invention is disclosed, which generally comprises the steps of sensing a plurality of operating parameters and at least one control parameter defining the energy quotient for the motive power and fluid driving system, and adjusting the control parameter(s) to substantially maximize the energy quotient for the system. The control method may also include the step of substantially maximizing the energy quotient at a predetermined or desired capacity of fluid flow.Type: GrantFiled: May 17, 1982Date of Patent: December 4, 1984Assignee: Michigan Consolidated Gas CompanyInventor: Husam Battah
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Patent number: 4384826Abstract: A compressor unloader system and method is disclosed, comprising a pneumatically controlled one-way valve member for controlling communication between an unloader chamber and a compression chamber of a compressor.The one-way valve member has one surface exposed to the pressure of the unloader chamber. To close it a control mechanism is actuated to present a lower pressure to an opposing second surface, interior of the valve member, creating a pressure differential to urge the one-way valve member toward a closed position.Temporary excesses of compression chamber pressures relative to unloader chamber pressures may bump the valve open to charge the unloader chamber with essentially maximum compression chamber pressure, thereby neutralizing the effect of the unloader chamber and fully loading the compressor.The one-way valve member is biased toward an open position.Type: GrantFiled: May 4, 1981Date of Patent: May 24, 1983Assignee: Tenneco, Inc.Inventor: James E. Gregg
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Patent number: 4330237Abstract: A method and system for controlling natural gas compressor and engine units. Particularly, the control method provides for the adjustment of the engine speed and compressor loading, so as to minimize the compressing energy required while maintaining a desired gas flow through the pipeline. The control of the engine speed and compressor loading is based in part on an energy quotient value for the unit. The control method further provides for efficient operation during multiple-stage compression, by controlling the interstage pressure. The control method is also adapted to predict impending compressor and engine unit failures. The control system is based upon a digital-type controller which generates control signals in response to changes in the energy quotient value for the unit.Type: GrantFiled: October 29, 1979Date of Patent: May 18, 1982Assignee: Michigan Consolidated Gas CompanyInventor: Husam Battah
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Patent number: 4068562Abstract: A cylinder of a piston compressor comprises a piston movable along the axis of the cylinder, a cylindrical admission valve and a cylindrical delivery valve. The admission valve communicates an admission space of the cylinder with a working space thereof. The delivery valve communicates the working space of the cylinder with a delivery space thereof.At least one valve, for instance the admission valve has means providing the control of the capacity of the cylinder, the movable member of said means being coaxially arranged inside the cylindrical admission valve.Type: GrantFiled: December 19, 1973Date of Patent: January 17, 1978Inventor: Mark Isaakovich Frenkel
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Patent number: 3961862Abstract: A positive displacement rotary compressor is in circuit with a closable chamber disposed upstream of the compressor gas inlet and including a conduit operable to be placed in communication with the compressor discharge conduit. A control circuit is operable to sense compressor discharge pressure and at a predetermined pressure condition sequentially operate valves to shut off compressor inlet flow thereby evacuating the chamber and then placing the compressor discharge port in communication with the chamber. The compressor thereby runs unloaded or at idle at a greatly reduced inlet and discharge pressure. The operation of unloading the compressor may be controlled by sensing the chamber vacuum or by the use of time delay devices.Type: GrantFiled: April 24, 1975Date of Patent: June 8, 1976Assignee: Gardner-Denver CompanyInventors: Soren E. H. Edstrom, Richard L. Ertel, Robert A. Litteken
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Patent number: 3951569Abstract: A piston type compressor for use with an automotive air conditioning system with the capabilities of successfully operating over a wide range of ambient temperatures including apparatus to automatically modify the compressor displacement in response to operating conditions. The effective displacement of the compressor is decreased in response to decreasing ambient temperatures to prevent an excess of compressor capacity over the cooling capacity of the evaporator at that temperature. The modulating apparatus includes pressure responsive valving mounted in the piston to monitor inlet pressure which correspond to operation during low ambient temperatures.Type: GrantFiled: May 2, 1975Date of Patent: April 20, 1976Assignee: General Motors CorporationInventor: James W. Jacobs