Position Of One Working Member Controls Motive Fluid Valve For Another Patents (Class 417/344)
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Patent number: 10533704Abstract: A pneumatic immersion lubricant pump, including a primary piston sliding in a sealed manner in contrast to at least one spring inside a cylindrical body together with which the primary piston defines a chamber provided on an opposite side of the primary piston with respect to that where the at least one spring is positioned, a body of the pump including at least one channel in which an element projecting from the primary piston is slidably housed in a sealed manner. The body of the pump including a plurality of cylinders each equipped with a loading port open on the outside of the pump body. Each cylinder housing a secondary piston axially constrained to the primary piston. The projecting element and the channel defining a pressurization duct of the chamber.Type: GrantFiled: October 23, 2017Date of Patent: January 14, 2020Assignee: DROPSA S.P.A.Inventor: Walter Divisi
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Patent number: 10375778Abstract: A single-segment linear constant-power LED driving circuit and method. The circuit comprises: a voltage input module, an LED load, a power switch tube, a sampling resistor, an over-voltage control module for detecting the voltage at a drain terminal of the power switch tube, a current control module for limiting a peak current of the LED load, and a comparison module. When an input voltage is greater than a turn-on voltage of the LED load, the current control module limits the peak current so that the current average value in different input voltage periods is constant. When the input voltage is greater than a set value, current flowing through the LED load is turned off, thereby reducing power consumption. When the input voltage is less than the turn-on voltage of the LED load, the LED load is turned off.Type: GrantFiled: December 30, 2016Date of Patent: August 6, 2019Assignee: CHINA RESOURCES POWTECH (SHANGHAI) CO., LTD.Inventors: Jun Liu, Quanqing Wu, Guocheng Li
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Patent number: 10077763Abstract: An air-driven pump includes a source of compressed air, a vacuum source including a venturi and two pump units with structurally independent pumping elements dividing pump chambers from air chambers. A directional control valve is in communication with the source of compressed air, the vacuum source, the pump unit air chambers. The directional control valve includes two valve positions alternating communication of the source of compressed air and the vacuum source with the air chambers. A pilot valve system shifts the directional control valve between the two valve positions at end of stroke positions of the pump and includes actuators extending into the air chambers to engage the pumping elements with the air chambers contracted.Type: GrantFiled: March 24, 2016Date of Patent: September 18, 2018Assignee: WILDEN PUMP AND ENGINEERING LLCInventor: Carl Glauber
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Patent number: 9897080Abstract: A liquid pumping system includes at least two water cylinders that are each controlled by a hydraulic piston. A rotary valve controls the hydraulic pistons. The rotary valve has an inner unit that rotates within an outer unit. Slots provided between the inner and outer units control the duration, rate and direction of hydraulic fluid supply to the hydraulic piston. 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. 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: GrantFiled: December 4, 2012Date of Patent: February 20, 2018Assignee: GENERAL ELECTRIC COMPANYInventor: Dean David Marschke
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Patent number: 9638179Abstract: 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: GrantFiled: December 4, 2012Date of Patent: May 2, 2017Assignee: General Electric CompanyInventors: Shyam Sivaramakrishnan, Todd Alan Anderson, Matthew David D'Artenay, Robert Bruce Kingsley
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Patent number: 8229609Abstract: A marine vessel control apparatus is arranged to start and stop engines that are respectively provided in multiple propulsion devices. The marine vessel control apparatus includes multiple individual start/stop switches arranged to correspond to the respective multiple propulsion devices and arranged to be operated by an operator to individually start and stop the engines in the respective multiple propulsion devices, an all-device start/stop switch arranged to be operated by the operator to collectively start and stop the engines in the multiple propulsion devices, an operating state acquiring unit arranged to acquire operating states of the engines in the respective multiple propulsion devices, and a control unit. The control unit includes multiple input ports corresponding to the respective multiple individual start/stop switches. Each of the input ports is connected with the corresponding individual start/stop switch. All of the input ports are connected commonly with the all-device start/stop switch.Type: GrantFiled: March 25, 2010Date of Patent: July 24, 2012Assignee: Yamaha Hatsudoki Kabushiki KaishaInventors: Takaaki Bamba, Makoto Ito
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Patent number: 6929454Abstract: In a thick matter pump, especially for delivering concrete, comprising two delivery cylinders, it is known to provide two position sensors in one of the two cylinders for control of the pistons. However, leakage of hydraulic fluid can lead to an imbalance of the two cylinders. In the invention two position sensors (52?, 52?) are provided, which are arranged at a defined distance from one of the ends of the drive cylinders and which respond to a drive piston (30?, 30?) that is passing by. To prevent the formation of concrete clots inside the delivery cylinders (10) and to prevent the occurrence of a slamming when the drive pistons (30?, 30?) reach their end of travel, the invention provides that both position sensors (52?, 52?) are arranged at a distance from the piston rod-side ends of both drive cylinders (24?, 24?) and, in addition, a correcting sensor (54) is arranged at a defined distance from the piston head-side end of one of the drive cylinders (24?).Type: GrantFiled: June 28, 2001Date of Patent: August 16, 2005Assignee: Putzmeister AktiengesellschaftInventors: Werner Münzenmaier, Wolf-Michael Petzold
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Publication number: 20030170127Abstract: The invention relates to a thick matter pump, especially for delivering concrete. The thick matter pump comprises two delivery cylinders (10), which open into a material feed basin (14) via openings (12) situated on the face. The thick matter pump also comprises two hydraulic drive cylinders (24′, 24″) whose pistons (26, 30′, 30″) are rigidly interconnected in pairs via a shared piston rod (28). The drive cylinders (24′, 24″) are connected to a hydraulic reversing pump (42) via piston rod-side and piston head-side pump connections (34′, 34″; 36′, 36″). In addition, they communicate with one another on their ends opposite the pump connections via a swing oil line (44). The drive cylinders and, with them, the delivery cylinders are driven in a push-pull manner via the reversing pump (42).Type: ApplicationFiled: January 24, 2003Publication date: September 11, 2003Inventors: Werner Muenzenmaier, Wolf-Michael Petzold
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Patent number: 6592334Abstract: The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulically controlled and actuated to work in alternate directions during a cycle using a closed loop hydraulic system. Each cycle is automatically re-indexed to assure volumetric balance in the circuits. An indexing circuit ensures that each plunger reaches its full extended position prior to the other plunger reaching its preset retracted position. A bias member and an acceleration valve are used to prime the indexing circuit for use in low or variable inlet pressure situations. A power saving circuit is used to transfer energy from the extending plunger to the retracting plunger.Type: GrantFiled: December 21, 2001Date of Patent: July 15, 2003Assignee: Weatherford/Lamb, Inc.Inventor: Bryan Virge Butler
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Patent number: 6171075Abstract: The invention relates to a sequential control system for two-cylinder thick medium pumps whose delivery cylinders (1, 1′) are actuated hydraulically by two drive cylinders (5, 5′) in opposing cycles. A pipe shunt (3) is provided inside a material feed container and is connected at the inlet side alternatively to the apertures (2, 2′) of the delivery cylinders (1, 1′) and at the outlet side to a pump line (4). The drive cylinders (5, 5′) are each connected at one end to a different connection pint of a reversing pump (6) to form a closed hydraulic circuit (11, 11′) and at their outer ends via an oscillating oil line (12) hydraulically to one another. To effect switching of the pipe shunt (3), pressure oil is taken off directly from the hydraulic lines (11, 11′) leading from the reversing pump (6) to the drive cylinders (5, 5′).Type: GrantFiled: September 25, 1998Date of Patent: January 9, 2001Assignee: Putzmeister AGInventors: Werner M{umlaut over (u)}nzenmaier, Christof Schnitzler
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Patent number: 5711658Abstract: A diaphragm pump including a pump housing having a first housing side and a second housing side; a first unitary manifold flow connected to the first housing side; a second unitary manifold flow connected to the second housing side. The first and second unitary manifolds are adapted to be flow connected to either the first or second housing sides. The diaphragm pump also includes a pump inlet manifold and a pump discharge manifold. The pump inlet and discharge manifolds each have a first end, a second end, a first flow port at one of the ends and a second flow port located along the manifold between the two manifold ends. Both of said manifolds are adapted to be flow connected to the first and second unitary manifolds.Type: GrantFiled: December 4, 1996Date of Patent: January 27, 1998Assignee: Ingersoll-Rand CompanyInventors: Michael Conti, Gerald M. Distel
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Patent number: 5639218Abstract: A superhigh pressure generator system is provided which comprises first, second and reserve boosters 1, 2, 3 which are respectively provided with a plunger chambers 4a, 4b, 4c within single rod-type oil hydraulic cylinders 7a, 7b, 7c on the plunger side and are operative to pressurize water sucked into the respective plunger chambers to superhigh pressure, the boosters being connected in parallel each other to a water discharge line 9 via check valves 6a, 6b, 6c respectively. First, second and reserve 3-position directional control valves 13, 14, 15 are interposed between the oil hydraulic cylinders 7a, 7b, 7c of the respective boosters on one hand and first and second oil hydraulic pumps 11, 12 on the other hand so as to permit a reciprocating motion of the oil hydraulic cylinders. On-off valves 20, 21, 23, 22 are respectively provided on discharge lines 17, 18, 19, 16 which connect the three-position directional control valves 13, 14, 15 to the first and second oil hydraulic pumps 11, 12.Type: GrantFiled: April 5, 1995Date of Patent: June 17, 1997Assignee: Daikin Industries, Ltd.Inventors: Yoshio Tanino, Takuichi Habiro, Takaaki Noda, Kouichi Hayashi
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Patent number: 5634779Abstract: A hydraulic fluid-driven, multicylinder, modular, reciprocating piston pumping machine of non pulsating flow and independently variable forward and return stroke speeds comprises several pumping modules (A, B . . . E) each having one primary cylinder (A1, B1 . . . E1) and one secondary cylinder (A2, B2 . . . E2) coaxially joined by an angularly and radially oscillating bushing (100) through which slides a piston rod (A3, B3 . . . E3) with an angularly oscillating piston (A4, B4 . . . E4; A5, B5 . . . E5) at each of its ends. Each primary cylinder (A1, B1 . . . E1) has the end opposed to the bushing closed by valve monifolds (A11, B11 . . . E11) interconnected through a pressurized hydraulic fluid distritubor conduit (5) through which pressurized hydraulic fluid is supplied to the primary cylinder of each module by at least one hydraulic pump (1, 2). A hydraulic fluid chamber (A18, B18 . . .Type: GrantFiled: January 5, 1996Date of Patent: June 3, 1997Assignee: FDP Engineering SAInventor: Jan L. Eysymontt
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Patent number: 5427507Abstract: A pair of control valve assemblies for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve assembly is switched by a pressure signal depending on the state of its counterpart's piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow. Each of the valve assemblies uses an intake-exhaust valve and a signal valve with the signal valve of one pump being connected to be pressure responsive to the piston of the opposite cylinder or pump.Type: GrantFiled: June 25, 1993Date of Patent: June 27, 1995Assignee: Regents of the University of CaliforniaInventor: John C. Whitehead
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Patent number: 5344290Abstract: A method and device for controlling a thick matter pump having two feed cylinders, each coupled to a material feed tank and including a drive piston for pumping thick matter through the respective feed cylinder. Each drive piston is driven within a respective drive cylinder coupled to a hydraulic reversing pump, which drives each drive piston through a compression stroke by pumping pressurized fluid to the respective drive cylinder. A hydraulically operable tube switch is alternately coupled to the feed cylinders to receive the thick matter being pumped, and is coupled to a delivery pipe to direct the flow of thick matter from each feed cylinder into the delivery pipe. Hydraulic tube-switch cylinders actuate the tube switch and are coupled between the reversing pump and the feed cylinders for receiving pressurized fluid flowing between the reversing pump and the drive cylinders to decouple the tube switch from one feed cylinder and couple the tube switch to the other.Type: GrantFiled: May 28, 1991Date of Patent: September 6, 1994Assignee: Putzmeister-Werk Maschinenfabrik GmbHInventor: Hartmut Benckert
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Patent number: 5252037Abstract: A piston pump for conveying fragile particulate food products without damaging the product. The pump includes a filler and a discharge conduit containing piston valves actuated by hydraulic cylinders. The pumping chamber in which the product is compressed is equipped with a linear displacement transducer/magnet sensor which senses not only the position, but the speed of the piston. In response to the sensor, a proportioning valve releases hydraulic fluid at increasing pressure to a desired maximum, to the hydraulic cylinder actuating the piston in the pumping chamber of a second pump operating in tandem with the first pump. The product is expelled alternatively from the two pumps at the maximum desired pressure appropriate for the character of the product. The pump also includes means for flushing the pump without dismantling.Type: GrantFiled: July 30, 1992Date of Patent: October 12, 1993Assignee: Aseptic Technology Engineering Co.Inventor: V. R. Carlson
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Patent number: 5222872Abstract: A double piston pump mechanism includes two pistons operated out-of-phase by respective fluid-actuated cylinders. The pistons suck-in fluid through suction valves and discharge pressurized fluid through pressure valves. The actuation of the cylinders is regulated by two change-over valves which are mechanically connected to respective cylinders. Each change-over valve is actuated when its respective cylinder reaches a fully extended position or a fully retracted position. The change-over valves are connected to a control mechanism which operates to reverse the direction of actuating fluid supplied to the cylinders, the suction valves, and the pressure valves only in response to actuation of both of the change-over valves.Type: GrantFiled: September 19, 1991Date of Patent: June 29, 1993Assignee: Paul Pleiger Maschinenfabrik GmbH & Co. KGInventors: F. Marian, H. J. Poting, R. Schwittek
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Patent number: 5222873Abstract: A control valve assembly for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve is switched by a pressure signal depending on the state of its counterpart's piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow.Type: GrantFiled: June 19, 1992Date of Patent: June 29, 1993Assignee: The United States of America as represented by the United States Department of EnergyInventors: John C. Whitehead, Hans G. Toews
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Patent number: 5213478Abstract: A slurry pumping method and an apparatus to deliver slurry waste from factories to a filter press for solid-liquid separation. In this apparatus, a pair of laterally or vertically arranged diaphragm type pumping devices are activated by hydraulic cylinders, each consisting of a main cylinder and a subcylinder directly connected to the main cylinder, to introduce slurry from the slurry tank and deliver it under pressure by a resilient diaphragm of each pumping device to the filter press where it is processed for solid-liquid separation. One of the diaphragm type pumping devices is first started, followed by the other, thus alternately and repetitively activating the two pumping devices to achieve continuous operation of the slurry pumping process. When the processing is completed, the two hydraulic cylinders of both diaphragm type pumping devices are stopped by controlling the sleeve valves. In this way, an effective slurry pumping can be achieved.Type: GrantFiled: December 23, 1991Date of Patent: May 25, 1993Inventor: Takeshi Hoya
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Patent number: 5209649Abstract: A two cylinder thick matter pump has two hydraulic drive cylinders, two pistons supported and driven within each respective drive cylinder, and two feed cylinders. Each feed cylinder is adapted to receive a respective piston therein to pump the matter therethrough. A hydro-pump is coupled to the drive cylinders to supply hydraulic fluid thereto. A reversing valve is coupled to the hydro-pump to reverse the direction thereof. Two pressure switching valves are coupled to one of the drive cylinders and to the reversing valve to actuate the reversing valve upon a change in cylinder pressure. Two electronic proximity switches are supported adjacent to the pistons and coupled to the reversing valve. The proximity switches actuate the reversing valve in parallel with the switching valves.Type: GrantFiled: November 27, 1990Date of Patent: May 11, 1993Assignee: Putzmeister-Week Maschinenfabrik GmbHInventors: Rolf Dose, Hartmut Benckert
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Patent number: 5114319Abstract: Concrete-pumping device comprising a frame, a number of pump cylinders mounted on the frame which comprise a pump opening close to one end, sealed pump pistons which are guided slidably in the pump cylinders toward and away from the pumping device and which are each coupled to reciprocal driving to the plunger of a coaxially arranged hydraulic jack, hydraulic switching means for cyclically feeding to and discharging from the jack hydraulic oil under pressure such that the plunger causes the reciprocating movement of the pump piston and concrete switching means for alternately placing the pump opening in communication with a feed funnel and a pressure conduit for concrete synchronously with the movement of the pump piston in order to pump concrete out of the feed funnel into the pressure conduit.Type: GrantFiled: October 10, 1990Date of Patent: May 19, 1992Inventor: Pieter Faber
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Patent number: 4490096Abstract: A pump system, particularly suitable for pumping wet mixes and slurries, achieves an output of pumped material substantially free from pulsations or fluctuations by control movement of power pistons (12A,12B) within power cylinders (10A, 10B). The power pistons (12A,12B) are connected by piston rods (14A,14B) to pumping pistons (16A,16B) which suck material to be pumped in through valves (20A,20B) and out through valves (22A,22B) into a delivery pipe (26). A closed loop (32) connects annular chambers (13A,13B) of the power cylinders (10A,10B), and a continuously operating pump (P2) feeds the closed loop (32). The power pistons (12A,12B) on their suction strokes move faster than on the delivery strokes, whereby one or other or both pistons (12A,12B) are always moving forwards.Type: GrantFiled: July 22, 1983Date of Patent: December 25, 1984Assignee: Hands-England Drilling LimitedInventor: Frederick J. Box
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Patent number: 4416593Abstract: Double acting, gas operated pumps for lifting formation fluids from a well are disclosed as comprising a housing connectible to the lower end of a production string suspended within a well, and a pump assembly which may be lowered into and raised from a landed position within the housing. Upper and lower pump chambers are formed in the pump assembly and a piston is reciprocable in each chamber in response to the alternate supply and exhaust of a pressurized gas to one side thereto for alternately admitting formation fluid to the other side of one piston while pumping it from the other. The spool of a reversing valve for controlling the flow of gas to and from the chambers is connected to one of the pistons in such a manner that it is shifted into its alternate positions with a snap action.Type: GrantFiled: August 22, 1980Date of Patent: November 22, 1983Inventor: Leslie L. Cummings
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Patent number: 4105373Abstract: A concrete pumping unit comprising a pair of parallel piston pumps, alternately placed in communication with a concrete supply conduit and with a concrete delivery pipe, through a single baffle blade valve and respectively driven by coaxial fluid pressure piston cylinders is disclosed. The cylinders are interlocked with each other by a pipe which places in communication the chambers of said fluid pressure cylinders, opposite to the chambers in which the pressurized fluid is supplied and discharged through orifices near the ends of said cylinders. A hydraulic circuit is provided for placing a fluid supply pump, in communication with the fluid pressure piston cylinder performing the suction phase, while the orifice of the other fluid pressure piston cylinder is placed in communication through another circuit including, a four-way changeover electro-valve and an actuator distributor device with a discharge reservoir.Type: GrantFiled: November 23, 1976Date of Patent: August 8, 1978Assignee: Fogt Industriemaschinenvertretung A.G.Inventor: Sergio Calzolari
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Patent number: 4036564Abstract: A concrete hopper has a plurality of arcuate channels in its bottom portion, preferably lined with a resilient material, such as rubber. The hopper includes a discharge end with discharge outlets formed therein in communication with the channels. A sliding sleeve-piston combination is associated with each channel for segregating and discharging a portion of the concrete through its associated discharge outlet. In other words, the sleeves are alternately filled by moving them through the hopper, and the pistons are operated to force the concrete out of the sleeves. A slide valve assembly including a discharge nozzle for connecting to a discharge hose and a pair of wear plates controls the discharge of pumped concrete from the discharge outlets. Hydraulic control means are included which automatically program the sequential operation of the sliding sleeve-piston combinations and the sliding valve.Type: GrantFiled: August 2, 1971Date of Patent: July 19, 1977Inventor: John A. Richards
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Patent number: 3994627Abstract: A pumping apparatus for wet concrete and the like comprising a pair of piston pumps having parallel axes, interlocked to one another and operating in phase opposition, the orifices of which are alternatively put in communication one with the conduit feeding the wet concrete and the other with the delivery conduit and vice versa by means of a reciprocally movable baffle blade valve having two operative limit positions, characterized by the fact that the pump pistons are each actuated by a single-acting jack, being provided means to at first move the baffle valve into either of its operative positions by means of a hydraulic control device, and then to actuate the jack which is about to begin its intake stroke only when the baffle blade valve has reached one of the limit positions, and to reverse the position of said baffle valve into its second limit position before the beginning of the compression stroke of the pump actuated by said jack and vice versa, and means for interlocking the movements of the jacks, aType: GrantFiled: November 12, 1974Date of Patent: November 30, 1976Assignee: Fogt Industriemaschinenvertretung A.G.Inventor: Sergio Calzolari
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Patent number: 3981622Abstract: An intensifier unit includes a pair of sequentially operated reciprocating ram assemblies, each powered by a cylinder motor. Extension of the cylinder rods is accomplished by application of pressurized hydraulic fluid to the pistons. The pistons are returned quicker than they are extended by means of continuous application of pressurized air to the back side of the pistons. The cylinder motors are precompressed prior to their respective forward strokes by means of an accumulator which continuously bleeds from the main hydraulic fluid supply line. Circuitry is provided to insure that precompression continues even if the ram and its driving piston move from their retracted position. Also disclosed is a safety interlock to shut down the intensifier if both cylinder rods become accidentally simultaneously extended.Type: GrantFiled: November 20, 1974Date of Patent: September 21, 1976Assignee: Kelsey-Hayes CompanyInventors: Richard W. Hall, Sven Sonnenberg