Pump Chamber In Constant Communication With Inlet Or Discharge Conduit Patents (Class 417/557)
  • Publication number: 20150064036
    Abstract: A piston pump is described for pumping a fluid. The pump includes at least one cylinder having a piston movable inside the cylinder along the longitudinal axis of the cylinder by a drive, each cylinder having at an end face a mounting flange having at least one cylinder opening, and a chamber having a volume that changes when the associated piston is moved in the cylinder. The piston pump has an inlet port for supplying and an outlet port for draining the fluid. A rotatable valve plate is arranged on the other side of the mounting flange. The mounting flange has at least one passage in the region of the inlet port and the outlet port, respectively, through which the fluid can flow between the inlet port and/or the outlet port and the other side of the mounting flange. The valve plate has fluid-transporting means by which, upon rotation of the valve plate at least one cylinder opening can be connected to a passage of the inlet and/or the outlet port.
    Type: Application
    Filed: March 8, 2013
    Publication date: March 5, 2015
    Inventor: Dietmar Eberhard
  • Patent number: 7955061
    Abstract: The invention provides a priming pump comprising a deformable envelope associated with an inlet endpiece and an outlet endpiece each fitted with a moving valve member, the endpieces being arranged in such a manner that when the valve members are in the closed position, the outlet endpiece presents a leakage rate that is greater than the leakage rate of the inlet endpiece.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: June 7, 2011
    Inventor: Nathalie Proust
  • Publication number: 20100270029
    Abstract: Disclosed is an apparatus comprising a hydraulic cylinder assembly, a load connected to the cylinder, a reversible hydraulic pump assembly, a pressurized supply of hydraulic fluid, first and second conduits for hydraulic fluid, and a control system. The hydraulic cylinder assembly comprises a cylinder sealed by an upper head and a lower head and carrying a piston which divides the hydraulic cylinder assembly into an upper chamber and a lower chamber. The load is connected to the piston and urges it toward the lower head. The first conduit for hydraulic fluid connects the reversible hydraulic pump assembly in fluid flow communication with the lower chamber of the hydraulic cylinder assembly. The second conduit for hydraulic fluid connects the reversible hydraulic pump assembly in fluid flow communication with the pressurized supply of hydraulic fluid.
    Type: Application
    Filed: June 28, 2010
    Publication date: October 28, 2010
    Inventors: Michael C. Ramsey, Michael L. Finley
  • Patent number: 7775576
    Abstract: An air pump assembly includes a pump module having an outer surface and a casing at least partially surrounding the pump module. The casing has an inner surface defining a cavity sized to snugly receive the pump module such that the outer surface of the pump module is in substantial engagement with the inner surface of the casing and is substantially prevented from moving with respect to the casing when the pump module is received within the cavity. At least one airflow passageway is defined between the inner surface of the casing and the outer surface of the pump module. The airflow passageway is configured so that air flowing through the passageway changes direction at least one time to reduce the transmission of noise from the air pump assembly.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: August 17, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Daniel R. Der Marderosian, Heinz Bauer, Stephane Laurent, Peter Bolz
  • Publication number: 20100173330
    Abstract: The present invention relates to an improved system for efficiently and accurately performing immunoassays, such as ELISAs. The invention provides an immunoassay assembly which includes a flow-through unit and an aspiration pump. The immunoassay flow-through unit includes an outer seal; at least one bed support; an inner seal; and a packed non-porous bed. The unit is releasably attached to an aspiration pump which enables the controlled flow rate of liquid passing through the packed bed of the flow-through unit. The invention also provides a method of using the immunoassay assembly to identify analytical targets of interest.
    Type: Application
    Filed: August 3, 2009
    Publication date: July 8, 2010
    Inventors: Scott P. Fulton, Robert J. Sakowski, William Bowers
  • Publication number: 20100061870
    Abstract: A microfabricated device (10) includes a structure (12) defining a closed fluid delivery channel (14), the channel (14) having an inlet (16) and an opposed outlet (18). A conducting polymer actuator (20) is arranged within the fluid delivery channel (14). At least a part of the actuator (20) is configured to vary its cross sectional area in a direction transverse to a direction of fluid flow in the channel (14). An actuator control arrangement (22) is carried by the structure (12) for controlling the actuator (20) to cause the actuator (20) to expand and contract cyclically and sequentially along the length of the actuator (20) to vary the cross sectional area of the channel (14) cyclically and sequentially to effect a peristaltic pumping action to deliver fluid from the inlet (16) of the channel (14) to the outlet (18) of the channel (14).
    Type: Application
    Filed: August 1, 2006
    Publication date: March 11, 2010
    Applicant: Auckland UniServices Limited
    Inventors: Mark B. Cannell, Ralph Paul Cooney, Paul Kilmartin, Christian Soeller, Jadranka Travas-Sejdic
  • Publication number: 20090036998
    Abstract: The present invention in one embodiment is a vacuum pump including a compressible elastomeric member with an internal reservoir enclosing a volume of fluid, an outlet port providing fluid communication between the internal reservoir and a fluid sink, and an inlet port providing fluid communication between the internal reservoir and a fluid source. The pump further includes first and second pressure elements coupled to the elastomeric member on opposing sides. At least one of the first and second pressure elements is adapted to apply a longitudinal force along, and a rotational force about, an axis extending through the compressible elastomeric member. Upon the application of a longitudinal compression force to the compressible elastomeric member, fluid flows from the internal reservoir to the fluid sink and upon the application of a longitudinal expansion force, fluid flows from the fluid source to the internal reservoir.
    Type: Application
    Filed: August 1, 2008
    Publication date: February 5, 2009
    Applicant: Otto Bock HealthCare LP
    Inventors: Robert Edward Finlinson, Douglas E. Rush, Luder Mosler
  • Publication number: 20080118382
    Abstract: Disclosed is an apparatus comprising a hydraulic cylinder assembly, a load connected to the cylinder, a reversible hydraulic pump assembly, a pressurized supply of hydraulic fluid, first and second conduits for hydraulic fluid, and a control system. The hydraulic cylinder assembly comprises a cylinder sealed by an upper head and a lower head and carrying a piston which divides the hydraulic cylinder assembly into an upper chamber and a lower chamber. The load is connected to the piston and urges it toward the lower head. The first conduit for hydraulic fluid connects the reversible hydraulic pump assembly in fluid flow communication with the lower chamber of the hydraulic cylinder assembly. The second conduit for hydraulic fluid connects the reversible hydraulic pump assembly in fluid flow communication with the pressurized supply of hydraulic fluid.
    Type: Application
    Filed: November 17, 2007
    Publication date: May 22, 2008
    Inventors: Michael C. Ramsey, Michael L. Finley
  • Patent number: 7261525
    Abstract: A manually operated pump having a pump assembly and a check valve. The pump assembly includes a dome with a fluid inlet. A support plate is sealed to the dome to define a fluid chamber. The support plate includes a fluid outlet. A foam material is positioned in the fluid chamber, the foam material expanding the dome to a rest state upon release of external pressure on the dome. The check valve has a valve inlet in fluid communication with the fluid outlet of the support plate. The check valve is positioned outside of the fluid chamber. The check valve has at least one exhaust channel to provide one way fluid flow from the fluid chamber through the exhaust channel.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: August 28, 2007
    Assignee: Dielectrics Industries, Inc.
    Inventor: Robert W. Pekar
  • Patent number: 7121809
    Abstract: A pump is provided having a pump chamber that is capable of changing a volume thereof by a diaphragm, an inlet passage permitting an operating fluid to flow into the pump chamber; an outlet passage permitting an operating fluid to flow out from the pump chamber; and a check valve provided on the inlet passage. An inertance value of the inlet passage is smaller than the inertance value of the outlet passage. The diaphragm is driven by a frequency f (Hz) satisfying the following formula: f ? 0.26 X ? L ? ? S wherein the inertance value of the outlet passage is L (kg/m4), the displacement from an upper end point to a bottom end point of the diaphragm is X (m), and the cross section area of the pump chamber is S (m2).
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: October 17, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Kunihiko Takagi, Takeshi Seto, Kazuhiro Yoshida
  • Patent number: 7059836
    Abstract: The invention provides a pump which has reduced pressure loss by using fewer mechanical on-off valves, which has increased reliability, which can be used under a high load pressure, which can be driven at a high frequency, and which has good drive efficiency by increasing discharge fluid volume per pumping period. A circular diaphragm, disposed at the bottom portion of a case, has its outer peripheral edge secured to and supported by the case. A piezoelectric device to move the diaphragm is disposed at the bottom surface of the diaphragm. A space between the diaphragm and the top wall of the case is a pump chamber. An inlet flow path, having a check valve serving as a fluid resistor disposed thereat, and an outlet flow path, which opens to the pump chamber during operation of the pump, open towards the pump chamber.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: June 13, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Kunihiko Takagi, Takeshi Seto
  • Patent number: 7056096
    Abstract: The invention provides a pump with high driving efficiency in which the number of mechanical switching valves is decreased to reduce pressure loss and increase reliability, and which is ready for high load pressure and high-frequency driving, and which increases the discharged fluid volume for one cycle of pumping. A circular diaphragm arranged on the bottom of a casing has the outer edge fixed to the casing. The diaphragm includes a piezoelectric element to move the diaphragm on the bottom surface thereof. The space between the diaphragm and the top wall of the casing serves as a pump chamber, wherein a suction channel and a discharge channel are opened to the pump chamber, the suction channel having a check valve serving as a fluid resistive element and the discharge channel being always communicated with the pump chamber, even during the operation of the pump.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: June 6, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Kunihiko Takagi, Takeshi Seto
  • Patent number: 7040875
    Abstract: A refrigerant pump includes a thin-walled hermetic vessel and a thick-walled hermetic vessel having an end inserted into and secured to an end of the thin-walled hermetic vessel. A stator of an electric motor unit is fitted outside the thin-walled hermetic vessel, while a rotor of the electric motor unit is accommodated inside the thin-walled hermetic vessel. A pump mechanism is fitted inside the thick-walled hermetic vessel, and a rotational force of the rotor is transmitted to the pump mechanism by the drive shaft.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: May 9, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masao Nakano, Hiromasa Ashitani
  • Patent number: 7025134
    Abstract: The present invention relates to petroleum recovery operations, and more particularly, to the use of pulse technology to enhance the effectiveness of waterflooding operations. The systems of the present invention generally comprise an injection means for continually injecting a fluid into the subterranean formation, and a pressure pulsing means for periodically applying a pressure pulse having a given amplitude and frequency to the fluid while the fluid is being injected into the subterranean formation.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: April 11, 2006
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Audis C. Byrd, David W. Ritter, Ronald G. Dusterhoft
  • Patent number: 6981854
    Abstract: A small piston pump is disclosed with a housing having a pair of space and connected pistons therein. The housing has a bore with one of the pistons engaging the bore near one end and has a sleeve mounted therein adjacent the other end. The second piston slides in the bore of the sleeve. One end of the sleeve has an inlet covered by a slit valve and in the end of the sleeve adjacent the slit valve it has a radial outwardly extending opening covered by an elastic band to control the flow of fluid thru the radial outward opening. The other end of the sleeve is carried by the housing bore with a passageway therebetween. A pump output opening is disposed in the housing between the sleeve and the one of the pistons.
    Type: Grant
    Filed: June 5, 2003
    Date of Patent: January 3, 2006
    Assignee: Chemilizer Products, Inc.
    Inventor: Jerry K. Chang
  • Patent number: 6948920
    Abstract: A hand held an portable pump has a housing with an inlet on the bottom and an outlet on its side. A central tube extends up from the housing and has a bulb attached at its end. An inlet gate is positioned proximate the inlet to operate between a closed position in which the flow of liquid there through is inhibited and an open position in which liquid may flow through the inlet. The outlet has an outlet gate that is positioned to inhibit the flow of liquid into the housing in its closed position and to permit the flow of liquid out of the housing and into a discharge tube in the open position. The bulb is operated between an at rest position and a deflected or compressed position to urge fluid into and out of the bulb and in turn draw liquid through the inlet into the housing and to urge the liquid out of the outlet and into the discharge tube.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: September 27, 2005
    Assignee: SWS Corporation
    Inventors: Michael A. Stoner, Tyler Merica
  • Publication number: 20040247453
    Abstract: The inflation device comprises a syringe whose piston presents a thread. It further comprises a retaining mechanism for retaining the piston and comprising two half-nuts movable between a position in which they are spaced apart from the thread and a position in which they engage the thread, together with control members mounted to tilt relative to the syringe body. For each half-nut, the retaining mechanism comprises two resilient tabs pressing against the corresponding half-nut and against the syringe body. In addition, each of the control members comprises a finger pressing against the corresponding half-nut and adapted, when the member tilts, to press against one of two bearing surfaces carried by the half-nut and offset relative to each other in a radial direction of the syringe body.
    Type: Application
    Filed: January 27, 2004
    Publication date: December 9, 2004
    Applicant: SEDAT
    Inventor: Pascal Denolly
  • Publication number: 20040220526
    Abstract: A lead screw mounting system for a syringe pump in which a second end of a lead screw is located within a hollow connection tube that connects a drive device engaged with the lead screw to a plunger drive head. A bearing mount is formed at the second end of the lead screw and a split bearing mounted to the bearing mount. The bearing mount has diverging bearing surfaces in an hour glass shape and the bearing has a complementary inner shape. The bearing is larger than the inner diameter of the connection tube and is in constant contact with the tube. During operation, the bearing tends to move up one or the other of the diverging bearing surfaces of the bearing mount depending on which direction the hollow connection tube is moving over the bearing creating a wedge action. The split bearing functions to keep the lead screw concentrically located within the hollow connection tube thereby increasing flow uniformity of the syringe pump.
    Type: Application
    Filed: April 29, 2003
    Publication date: November 4, 2004
    Inventor: David E. Boyne-Aitken
  • Patent number: 6716002
    Abstract: The micro pump 100 comprises a first flow pass 115 for changing the flow pass resistance in accordance with the differential pressure, a second flow pass 117 wherein the percentage change in flow pass resistance relative to the differential pressure is less than that of the first flow pass 115, pressure chamber 109 connected to the first flow pass 115 and the second flow pass 117, and a piezoelectric element 107 for changing the pressure within the pressure chamber 109 so as to transport minute amounts of fluid with high precision using a simple construction. The ratio of the flow pass resistance of the first flow pass 115 and the flow pass resistance of the second flow pass 117 differs by changing the pressure within the pressure chamber 109 via the piezoelectric element 107, such that fluid can be transported in a standard direction and an opposite direction.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: April 6, 2004
    Assignee: Minolta Co., Ltd.
    Inventor: Kusunoki Higashino
  • Patent number: 6623256
    Abstract: Since many valves are used, pressure loss is large, resulting in low reliability of a pump. Even when the period of increasing and decreasing the volume of a pump chamber is long, and a piezoelectric element is used as an actuator that drives a diaphragm, a driving operation cannot be performed at a high frequency, or a proper flow rate cannot be realized under a high load pressure. In accordance with the invention, the combined inertance value of an entrance passage used to make working fluid flow into a pump chamber is smaller than the combined inertance value of an exit passage used to make the working fluid flow out from the pump chamber. A fluid resistance member is provided at the entrance passage in which fluid resistance when the working fluid flows into the pump chamber is smaller than fluid resistance when the working fluid flows out of the pump chamber.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: September 23, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Kunihiko Takagi, Takeshi Seto, Kazuhiro Yoshida
  • Patent number: 6547749
    Abstract: A vest for a human body has an air core coupled to a pulsator operableto subject the vest to pulses of air which applies and releases high frequency pressure forces to the body. The pulsator has two diaphrams connected to an electric de motor with rotary to reciprocating linear motion transmitting mechanisms operable to generate air pulses in an air pulsing chamber. The diaphragms also increase the pressure in a manifold chamber. A check valve connects the manifold chamber with a pulsing chamber to allow pressurized air to flow from the manifold chamber into the pulsing chamber. An air flow control valve in commmunication with the manifold chamber is used to adjust the pressure of the air in the manifold and pulsing chambers.
    Type: Grant
    Filed: July 12, 2001
    Date of Patent: April 15, 2003
    Assignee: Electromed, Inc.
    Inventor: Craig N. Hansen
  • Patent number: 6312411
    Abstract: A fluid supplying apparatus having a rubber elastic film (11) with fluid contained therein, an upstream tube (30), an intermediate station (40) disposed at a distal end of the upstream tube (30) and a downstream tube (27) connected to the intermediate station (40) is provided. The upstream tube (30) has two flow paths (31A and 32A) formed in a predetermined length extending in a longitudinal direction. The intermediate station (40) has a case (41), the case (41) having a fluid outlet (51) to which the downstream tube (27) is connected, a first communicating channel (52) for intercommunicating the fluid outlet (51) and one of the flow paths (31A), a reservoir (53) in communication with the other flow path (32A), a second communicating channel (55) having a check valve (54) at an intermediate portion thereof and intercommunicating the reservoir (53) and the fluid outlet (51), and a pressing member (56) for discharging the fluid stored in the reservoir (53) to the second communicating channel (55).
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: November 6, 2001
    Assignee: Aubex Corporation
    Inventor: Masahiro Kanai
  • Patent number: 6299421
    Abstract: An oil supply apparatus of a linear compressor including an oil feeder frame having an oil cylinder, an oil suction hole communicated with the oil cylinder and an oil discharge hole; an oil cover combined to the oil feeder frame to cover the oil cylinder and having an oil suction opening selectively communicated with the oil suction hole and an oil communication space selectively communicated with the oil cylinder and the oil discharge hole; an oil piston positioned between the oil feeder frame and the oil cover, being inserted in the oil cylinder and performing a slidable reciprocal movement to suck and discharge oil; and a single oil valve positioned between the oil cover and the piston. In the apparatus, only one oil valve is used to reduce the parts in number and facilitate the assembling of the valve, and does not contact other structure during its operation of the opening and closing so that a proper amount of oil can be constantly supplied.
    Type: Grant
    Filed: March 13, 2000
    Date of Patent: October 9, 2001
    Assignee: LG Electronics, Inc.
    Inventors: Won Sik Oh, Hyeong Kook Lee
  • Patent number: 6227824
    Abstract: A fluid pump has a pump body and a displacer which is adapted to be positioned at a first and at a second end position by means of a drive, the displacer and the pump body being implemented such that a pump chamber is defined therebetween, and the pump chamber being adapted to be fluid-connected to an inlet and to an outlet via a first opening and a second opening which are not provided with check valves. An elastic buffer bordering on the pump chamber is provided. The displacer is implemented in the form of a plate which is secured to the pump body, and the pump body is provided with a recess defining the pump chamber. The drive acts on the displacer substantially in the area of the first opening. The displacer closes the first opening when it occupies its first end position and leaves the first opening free when it occupies its second end position.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: May 8, 2001
    Assignee: Han-Schickard-Gesellschaft für angewandte Forschung e.V.
    Inventor: Manfred Stehr
  • Patent number: 6224347
    Abstract: A pump (10) includes a motor (11) which rotates a pumping assembly (52) which includes a face plate (54) and a cylinder (56). A piston (67) reciprocates in the cylinder (56) to draw fluid into the cylinder (56) from an intake groove (78) and an intake port (76) formed in a manifold plate (73) positioned adjacent to the face plate (54), and to thereafter discharge that fluid to a discharge groove (80) and a discharge port (77) formed in the manifold plate (73). The piston (67) rides on a swash plate (49) as the face plate (54) rotates, and the extent of reciprocation of the piston (67) and therefore the amount of fluid to be dispersed on each reciprocation of the piston (67) is controlled by an adjuster wheel (40) which can be moved to allow the swash plate (49) to pivot a predetermined extent. As such, the pump (10) can dispense a known precise amount of fluid on each reciprocation of the piston (67).
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: May 1, 2001
    Assignee: The Gorman-Rupp Company
    Inventors: George A. Clark, Robert J. Hayes
  • Patent number: 5895208
    Abstract: A reciprocating piston machine (1) has an inlet valve (9) on the suction side and an outlet valve (10) on the delivery side, which valves exhibit a valve body having a valve disc (11, 12) comprising of an elastomer, whereby the compression chamber (6) sealed off by the reciprocating piston or similar displacer (2) and by the valves (9, 10) has a pressure relief connection between compression chamber and atmosphere. To be able to bring the compression chamber (6) quickly to atmospheric pressure after the reciprocating piston machine (1) has been put out of operation and to be able to bring about the restart of the reciprocating piston machine (1) so as to be load-free in this respect, the valve disc (11,12) of the valve (9, 10) on the delivery side and/or on the suction side has at least one capillary passage (18, 19) as pressure relief connection.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: April 20, 1999
    Assignee: KNF Neuberger GmbH
    Inventors: Heinz Riedlinger, Erich Becker
  • Patent number: 5846060
    Abstract: A pump which has a piston (30) which is reciprocatingly moved vertically inside a tubular housing (32) to extract fluid from the bottom of a well (29). The piston (30) is attached to a motor (12) for driving it and has a horizontally extending base plate (50) with a central opening (52) provided with a plug (64) functioning as a check valve. As the fluid is pumped, the plug (64) is raised and the fluid flows into a high pressure reservoir (35) above the base plate (50). When the pressure inside the reservoir (35) exceeds a specified level, the base plate (50) is moved downward against an upward biasing force. This opens an annular port (51) exposing bleed ducts (56) and allows some of the fluid in the reservoir (35) to flow back into low pressure chamber (37) located below the base plate (50).
    Type: Grant
    Filed: August 3, 1995
    Date of Patent: December 8, 1998
    Inventors: Ernesto Y. Yoshimoto, Carlos Y. Yoshimoto
  • Patent number: 5650082
    Abstract: An apparatus and method for thermal processing, and more particularly for rapid thermal processing wherein a first thermal radiator generates and projects a first pattern of thermal radiation onto a first surface of a substrate, and wherein a second thermal radiator generates and projects a second pattern of thermal radiation onto a second surface of the substrate. The temperatures on the first and second surfaces are sensed by sensing means. Means for controlling the first and second thermal radiator means in response to the sensing means cause a prescribed temperature profile to be produced within the substrate.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 22, 1997
    Assignee: Applied Materials, Inc.
    Inventor: Roger N. Anderson
  • Patent number: 5647731
    Abstract: An air compressor in which oil loss due to the pressure in the cylinder becoming negative during an unload can be prevented, thereby protecting an outlet-side unloader valve. An air leak hole with a specific ventilating resistance is formed between a valve body and a valve seat of an intake-side unloader valve when the intake-side unloader valve is closed. Also, a valve seat portion is provided, which cuts off a sliding portion of the outlet-side unloader valve from the outlet passage when the outlet-side unloader valve is opened.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: July 15, 1997
    Assignee: Zexel Corporation
    Inventor: Motoyuki Onozawa
  • Patent number: 5509792
    Abstract: A reciprocal type of pump structure wherein a piston has a linear function actuated by a pair of coils energized alternately and includes a plurality of tapered flutes. A check valve in an outlet of the structure which stretches to open said outlet under the impact of expelled fluids and of its own volition retracts to the closed position immediately upon the cessation of fluids being expelled.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: April 23, 1996
    Assignee: Pumpworks, Inc.
    Inventors: Paul J. Sullivan, Vernon R. Scott, Robert Smith
  • Patent number: 5020977
    Abstract: A compressor for compression-evaporation cooling systems, which requires no moving parts. A gaseous refrigerant inside a chamber is acoustically compressed and conveyed by means of a standing acoustic wave which is set up in the gaseous refrigerant. This standing acoustic wave can be driven either by a transducer, or by direct exposure of the gas to microwave and infrared sources, including solar energy. Input and output ports arranged along the chamber provide for the intake and discharge of the gaseous refrigerant. These ports can be provided with optional valve arrangements, so as to increase the compressor's pressure differential. The performance of the compressor in either of its transducer or electromagnetically driven configurations, can be optimized by a controlling circuit. This controlling circuit holds the wavelength of the standing acoustical wave constant, by changing the driving frequency in response to varying operating conditions.
    Type: Grant
    Filed: July 12, 1989
    Date of Patent: June 4, 1991
    Inventor: Timothy S. Lucas
  • Patent number: 4743169
    Abstract: A diaphragm-type vacuum pump device which includes a diaphragm, a pumping chamber the volume of which is changed by reciprocating motion of the diaphragm, a check valve for drawing air into the pumping chamber, a check valve for discharging air from the pumping chamber and an orifice or relief valve disposed in the pumping chamber so that the pumping chamber communicates with atmosphere.
    Type: Grant
    Filed: June 2, 1987
    Date of Patent: May 10, 1988
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Jun Funakawa, Hiroaki Morioka
  • Patent number: 4709304
    Abstract: A light radiator for diffusing and radiating light rays, transmitted through an optical cable or the like, outside of the optical conductor cable, includes a transparent cylinder, an optical conductor for guiding light rays into the cylinder, an optical means movably accommodated in the cylinder for reflecting and radiating the light rays, and a driving device for moving the optical means along the axial direction of the cylinder.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: November 24, 1987
    Inventor: Kei Mori
  • Patent number: 4627798
    Abstract: A single cylinder pump for circulating cleaning fluids through a radiator or like cooling system applies positive and negative pressure to the fluid to create a pulsating agitation of the fluid through the radiator through the use of a thin washer-like plate which is reciprocatively driven within the cylinder. The washer-like plate is slightly smaller than the cylinder and is separated from the inside of the cylinder by a small annular clearance thereby eliminating the need for lubrication and permitting the pump to be self-priming and to release gases generated by the agitation of the fluids.
    Type: Grant
    Filed: April 24, 1986
    Date of Patent: December 9, 1986
    Inventor: Dalton A. Thomas
  • Patent number: 4594058
    Abstract: A single valve diaphragm pump is disclosed which generally includes: a pump housing, a flexible diaphragm reciprocally movable in the pump housing; an inlet filter means; and, an outlet valve. The flexible diaphragm conforms in shape to a portion of the pump housing when the diaphragm is in its actuation or rest position. The pump eliminates an inlet check valve and replaces it with an inlet filter means. The invented pump has a stroke volume which is extremely constant even though ambient pressure and reservoir pressure may vary over a considerable range. Furthermore, the invented pump provides a practical means for preventing gas bubbles from entering into the pump chamber. The invented pump can have application as a medication pump for use external to or implanted within a living body.
    Type: Grant
    Filed: November 26, 1985
    Date of Patent: June 10, 1986
    Assignee: The Johns Hopkins University
    Inventor: Robert E. Fischell
  • Patent number: 4561829
    Abstract: A horizontal compressor including an electric motor and a compressor element mounted in a case serving concurrently as an oil sump. The compressor element includes a cylinder, a shaft having a crank, a roller fitted to the crank for eccentric rotation along inner side surfaces of the cylinder, a vane moving in reciprocatory movement in a bore of the cylinder while abutting against the roller, two side plates located on opposite sides of the cylinder, one of the two side plates being formed with a suction port for a lubricant and the other side plate being formed with a discharge port for the lubricant, and a pump chamber defined by a back of the vane, the bore of the cylinder and the two side plates.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: December 31, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Iwata, Masahiro Takebayashi, Akio Sakazume, Yoshihisa Uneyama, Kazuo Sekigami, Shigetaro Tagawa, Masahiko Sugiyama
  • Patent number: 4557677
    Abstract: A lateral rotary compressor comprises a compressing mechanism including a blade chamber for filling the lubricating oil, and a blade contained in the blade chamber and reciprocatingly movably between the first position where the blade chamber is increased to the maximum volume and the second position where the blade chamber is decreased to the minimum volume, and a supply tube for communicating the blade chamber with bearings and having an opening formed at the position located in a lubricating oil reservoir.
    Type: Grant
    Filed: December 10, 1984
    Date of Patent: December 10, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Masumi Hasegawa
  • Patent number: 4544338
    Abstract: A horizontal type rotary compressor including a compression element having a cylinder, a shaft having a crank thereon, a pair of side plates concurrently serving both as bearings of the shaft and as side walls of the cylinder, a roller fitted onto the crank, and a vane so arranged as to slide in a groove of the cylinder and have a tip end thereof contacted with the roller rotating in accordance with the rotation of the crank and an appropriate end thereof urged by a spring to make a reciprocating movement along the groove are provided within a case. A pumping chamber is defined by a rear face of the vane, the groove of the cylinder and the side plates. One of the side plates is formed with a suction port capable of sucking thereinto the oil within the case while the other of the side plate is formed with a discharge port for transmitting the oil in the pumping chamber to an oil feeding passage.
    Type: Grant
    Filed: May 15, 1984
    Date of Patent: October 1, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Takebayashi, Akio Sakazume, Hiroshi Iwata, Masahiko Sugiyama, Mitsuru Murata, Shigetaro Tagawa
  • Patent number: 4543046
    Abstract: A horizontal type rotary compressor includes a lubricant distribution system which does not require a check valve for preventing the return of lubricant from the frictional bearing surfaces to the blade chamber. An eccentric blade within a blade chamber pumps lubricant out of the blade chamber through an aperture in one wall thereof. A dispensing pipe communicates the aperture of the blade chamber with the frictional bearing surfaces and includes an opening in the pipe adjacent the blade chamber. Reciprocal movement of the blade causes lubricant to be sucked through the aperture of the blade chamber and discharged from the blade chamber into the dispensing pipe. The opening in the pipe permits a larger amount of lubricant to pass into the pipe than out of the pipe, thereby effectively acting as a check valve and negating the need for a separate check valve in the lubricant distribution system.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: September 24, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Masumi Hasegawa
  • Patent number: 4543047
    Abstract: A horizontal type rotary compressor includes a lubricant distribution system which does not require a check valve for preventing the return of lubricant from the frictional bearing surfaces to the blade chamber. An eccentric blade within a blade chamber pumps lubricant out of the blade chamber through an aperture in one wall thereof. A dispensing pipe communicates the aperture of the blade chamber with the frictional bearing surfaces and includes an opening in the pipe adjacent the blade chamber. Reciprocal movement of the blade causes lubricant to be sucked through the aperture of the blade chamber and discharged from the blade chamber into the dispensing pipe. The opening in the pipe permits a larger amount of lubricant to pass into the pipe than out of the pipe, thereby effectively acting as a check valve and negating the need for a separate check valve in the lubricant distribution system.
    Type: Grant
    Filed: April 6, 1982
    Date of Patent: September 24, 1985
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventor: Masumi Hasegawa
  • 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: 4087214
    Abstract: An air supply system for supplying air to a periodically opened valve comprising a conduit for connecting the valve in continuous communication with a source of air and an expandable air storage chamber connected to the source of air and to the valve.
    Type: Grant
    Filed: December 24, 1975
    Date of Patent: May 2, 1978
    Assignee: Delta Scientific Corporation
    Inventors: Jack Kushner, Henry G. Zwirblis
  • Patent number: 4070133
    Abstract: An air supply unit provides high pressure moisture-free air in the dispensing of beverages. Components are housed in a portable cabinet and include a compressor and an automatic air pressure switch to switch on the compressor and begin air flow when system pressure falls below a pre-set level. A check valve is located in the high pressure line adjacent the compressor to maintain line pressure when the compressor is off. A small air bleed opening is located between the check valve and the compressor to allow compressed air to move through the air line yet bleed residual pressurized air to prevent stalling of the compressor which could occur if high pressure air was present in the compressor when it is restarted. The high pressure air discharge line includes a dump-check valve to permit high pressure air to be manually bled from the system before the air lines are disconnected and to prevent back flow of fluid into the air supply unit.
    Type: Grant
    Filed: February 9, 1976
    Date of Patent: January 24, 1978
    Inventor: Homer McCormick