| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 221 | Multistage gear pump | US10762842 | 2004-01-22 | US20040213680A1 | 2004-10-28 | Shigeru Suzuki; Toshiro Fujii |
| A multistage gear pump for pressurizing fluid includes a housing, a drive shaft and a gear assembly. The drive shaft is rotatably supported in the housing. The gear assembly is disposed in the housing. The gear assembly includes at least first and second gear trains. Each train has a pair of drive and driven gears that are engaged with each other. The drive gear is provided on the drive shaft and followed by the driven gear. The first gear train and the second gear train are arranged so that fluid sequentially passes therethrough as the drive shaft rotates. A theoretical discharge capacity of the first gear train is larger than that of the second gear train. | ||||||
| 222 | Tandem fixed displacement pump with torque control | US09566676 | 2000-05-08 | US06293765B1 | 2001-09-25 | Mark A. Peterson |
| A tandem fixed displacement pump circuit with torque control includes first and second pumps that draw fluid from a reservoir to supply respective load circuits, pressure relief valves for each of the load circuits, and a pilot operated sequence valve that monitors the pressure for each of the circuits and reduces the pressure of one of the circuits as the pressure in the other circuit rises. The sequence valve modulates to control the pressure in the secondary priority circuit so that a predetermined input torque value is not exceeded. | ||||||
| 223 | Guided vanes hydraulic power system | US231315 | 1994-04-22 | US5573035A | 1996-11-12 | Norbert J. Kunta |
| A selector valve having a valve chamber, first and second ports and a diversion passageway linking two sections of the valve chamber. A valve member is movable such that fluid flow is unchanged to a tank while the flow between three positions, first port, second port and diversion passageway may be infinitely varied. | ||||||
| 224 | Fixed geometry variable displacement pump system | US47532 | 1993-04-19 | US5299920A | 1994-04-05 | Charles F. Stearns |
| A fluid pumping system that maintains the temperature rise at a minimum value of the fluid being recirculated in the pumps during a given operating condition in the pumping system's operating envelope be disclosed. A pair of positive displacement pumps judiciously sized at different capacities are driven by a differential pumping or gearing system that is driven by a single source and cooperates with a fluid circuit delivering flow to a receiver so that the relationship of the pressure in the fluid circuit bears a given relationship to the flow capacity produced by each pump at given operating points in the operating envelope. The circuit includes a resistance in one line leading to and from one of the pumps that exhibit different resistance to the flow when flowing in one direction as opposed to the flow in the reverse direction and a valve, responding to a control for attaining the demands placed on said receiver, in another flow line in the circuit controls the capacity of each of the pumps and hence the flow being delivered to the receiver. The system is particularly efficacious for controlling fuel flow to the combustor of a gas turbine engine used in aircraft or industrial applications. | ||||||
| 225 | Gas turbine fuel pumping apparatus | US602821 | 1990-10-24 | US5110269A | 1992-05-05 | James A. Fallon |
| A fuel pumping apparatus, particularly useful for gas turbine engines, includes a dual element positive displacement fuel pump having a centrifugal type boost stage and, downstream, at least two parallel gear type elements. A controllable means for unlocking at least one of the elements includes a bypass line which provides a flow path to the inlet of the fuel pump from the pressurizing chamber of the gear elements which is used to urge end bearings of the gear elements into contact with the revolving gears thereby enabling the gears to pump fluid. Disposed in the bypass line is slide valve to open up the bypass line and unload and render the unloadable gear element inoperative. Control is provided by a Full Authority Digital Electronic Control and its associated Hydromechanical Unit which uses the fuel as a hydraulic fluid to actuate the slide valve. | ||||||
| 226 | Dual capacity fluid pump | US589045 | 1990-09-27 | US5087177A | 1992-02-11 | William J. Haley; Glenn E. Swanson |
| A dual capacity pump having at least two gear pump stages with a common fluid inlet passage, each pump stage having a discharge port, the discharge port for one stage communicating with a fluid pressure load through a flow delivery passage and the discharge port for the other stage communicating with the flow delivery passage through a one-way flow valve, and flow control valve means responsive to an operating variable for connecting the discharge side of the other stage to the common fluid inlet passage during operation in a first operating range of low driving speeds for the pump and to said flow delivery passage through the one-way flow valve during operation in a calibrated range of values for the operating variable. | ||||||
| 227 | Oil pump | US445383 | 1989-12-04 | US5040951A | 1991-08-20 | Masaya Nikaido |
| An oil pump includes a pair of pump cartridges, one of which can be unloaded. Oil which is discharged from one of the pump cartridges is supplied to an accumulator through a supply passage in which an orifice is provided. The orifice is opened and closed in response to a pressure which prevails in the accumulator. A spool is operated upon by a pressure differential across the orifice to return the discharged oil to the suction side of the pump. A clearance is formed between the outer surface of the spool and the inner surface of the valve opening in which the spool is fitted, permitting the oil in a chamber into which a pressure prevailing downstream of the orifice is introduced to be returned to the return path. | ||||||
| 228 | Power transmission | US318553 | 1989-03-03 | US5017098A | 1991-05-21 | Lowell D. Hansen; J. Richard Hurley; Jean J. Schweitzer; Walter J. Zoya |
| A split-discharge balanced dual-lobe vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radially inwardly directed surface forming a track for sliding engagement with the vane. Opposed symmetrical pressure cavities are formed between the cam ring surface and the rotor, and fluid inlet and outlet passages in the housing are coupled to the fluid pressure cavities. The fluid inlet and outlet passages include a fluid inlet port opening into each cavity adjacent to one circumferential edge thereof, a first fluid outlet port opening into each cavity adjacent to the opposing circumferential edge thereof, and a second fluid outlet port opening into each cavity at a position circumferentially between the inlet and first outlet ports. | ||||||
| 229 | Dual pump controls | US486387 | 1983-04-19 | US4591317A | 1986-05-27 | Albert L. Markunas |
| Controls for a dual element pump having first and second pumps with separate outputs wherein a modulating valve is positionable to control the amount of fuel delivered by a first pump to a fuel control and additionally to selectively control the utilization of flow delivered by the second pump. The flow from the second pump is bypassed when not needed through a pressure regulating valve having a minimal setting and with the setting of the pressure regulating valve being increased by operation of the modulating valve prior to the flow from the second pump being added to the flow from the first pump. The control of the modulating valve is by means of a flow control valve operating through dynamic compensator structure. The flow control valve is positioned by a head sensor including a jet pipe shiftable from a null position by a pressure differential signal delivered by two pressure sensing lines sensing a pressure differential across a variable area opening in a valve forming part of the fuel control. The foregoing structure operates to maintain a constant pressure differential at the fuel control by adjusting the rate of fuel delivery to the fuel control with a stepless transition between the utilization of one or two pumps. | ||||||
| 230 | Pump assembly and operating method | US422596 | 1982-09-24 | US4493616A | 1985-01-15 | Thomas F. Bergin |
| An improved pump assembly is used to supply fuel to an aircraft engine and includes a positive displacement pump which supplies fuel during low speed operation of the pump assembly and a centrifugal pump which supplies fuel during relatively high speed operation of the pump assembly. The positive displacement pump has a plurality of vanes connected with an impeller of the centrifugal pump. The vanes are forced radially inwardly against a stationary cam surface by fluid pressure. The fluid pressure is conducted from an outlet of the positive displacement pump through a passage in the impeller of the centrifugal pump to pressure chambers disposed at outer ends of the vanes. By providing the fluid pressure passage in the impeller of the centrifugal pump, the axial length of the pump assembly tends to be minimized. The positive displacement pump is rendered ineffective to pump fluid when the output pressure from the centrifugal pump equals the output pressure from the positive displacement pump. When the positive displacement pump is ineffective, the components of the positive displacement pump are lubricated by fluid which flows from the positive displacement pump to the centrifugal pump through a common drive shaft for the two pumps. | ||||||
| 231 | Variable displacement vane pump with vanes contacting relatively rotatable rings | US202502 | 1980-10-31 | US4406599A | 1983-09-27 | Robert W. Stephan |
| A variable displacement vane pump is provided in which a pair of rings having oval-shaped inner contours are rotatably mounted in side-by-side relationship. The rings are adapted for relative rotation to each other from a first position wherein the inner contours are in register with each other and a moved position wherein the inner contours are out-of-register, and means are provided for effecting the relative rotation, which include a gear system operatively connected to the rings. A rotor member is mounted for rotation within the rings and is formed with a plurality of circumferentially spaced recesses which extend the entire axial length of the rotor. Each of the recesses carries a pair of vanes in abutting relationship. The vanes are mounted for radial movement in the recesses and are adapted for slidable contact with the inner contours of the rings. The vanes form two side-by-side rows of vanes with each row in tracking relationship with the inner contours of the rings. With the inner contours rotated to the first position, rotation of the vanes will pump a maximum volume of fluid through the pump and with the inner contours rotated to the moved position, the vanes will pump a reduced volume of fluid through the pump. | ||||||
| 232 | Positive displacement pump systems | US101791 | 1979-12-10 | US4391569A | 1983-07-05 | Ian T. Bristow; Alec Thornelow |
| To minimize the power absorbed by a positive displacement pump system used where the requirement for pressure fluid varies inversely with the pump speed, notably in automobiles, the system provides two separate delivery passages 61, 62 for the pumped fluid and a discharge passage 66 into which the fluid from the delivery passage is passed under the control of a valve means 70, 71, the valve means commencing to operate on one (62) of the two delivered flows at lower speeds to by-pass a proportion of said one flow to an overspill 79, while the fluid not bypassed is added to the flow from the other delivery passage being passed to the discharge passage. The said proportion is increased in a manner to maintain the pressure drop across a discharge orifice in the discharge passage 66 at a constant value, and as the pump speed increases further the valve means commences to by-pass also an increasing proportion of the flow from said other delivery passage 61 to the overspill to maintain the said pressure drop constant. The increase in area of communication between the second delivery passage and overspill is greater than the increase in area of communication between the first delivery passage and overspill. In this way, the final regulation is carried out on a smaller quantity of fluid and less fluid is pumped to the highest pressure in the system. | ||||||
| 233 | Hydraulic power pack | US177527 | 1980-08-12 | US4381904A | 1983-05-03 | Louis D. Kyte; Malcolm N. Council |
| A hydraulic power pack for supplying hydraulic fluid under pressure for operating apparatus such as hydraulic workover units used in servicing oil and gas wells. The power pack provides substantially constant hydraulic power input to the driven apparatus over a wide range of pressures and flow rates. The power pack includes a constant speed engine, a gear box driven by the engine, a bank of positive fixed displacement pumps of varying sizes driven by the gear box and having discharge ports connected with a common discharge manifold, a hydraulic fluid reservoir, an intake manifold between the reservoir and the pumps, a return line to the reservoir, a recirculating line connected between the discharge from each of the pumps and the return line, and an unloading valve in each of the recirculating lines operable responsive to the pressure in the discharge manifold for recirculating each of the pumps to the reservoir at a predetermined pressure value. Each of the unloading valves is set to open at a different pressure ranging from a minimum at which all of the pumps discharge to the discharge manifold to a maximum above which all of the pumps recirculate to the reservoir. The unloading valves are set to operate in graduated sequence with all the pumps discharging to the manifold below a first minimum pressure with one pump automatically recirculating to the reservoir as each predetermined pressure increase increment is reached until at the last operating stage only a single pump is discharging to the manifold and above that stage all pumps recirculate to the reservoir. The power pack permits operating a hydraulic workover unit automatically providing maximum lifting force at a minimum speed to minimum lifting force at a maximum speed. | ||||||
| 234 | Positive displacement pump systems | US101788 | 1979-12-10 | US4360322A | 1982-11-23 | Ian T. Bristow; Nigel J. Petts |
| A positive displacement pump system has two delivery passages communicating under the control of a valve with a main discharge passage and/or an overspill duct. The valve is constituted by a valve member slidably mounted in a valve bore and the valve member has lands and intermediate recesses controlling communication between the delivery passages and the overspill duct. The pressures upstream and downstream of a discharge orifice in the discharge passage are applied to the valve member in opposition to each other, increase of the pressure drop tending to move the valve member to increase the amount of fluid passed to the overspill duct. To overcome the known tendency for a valve member to be subjected by the hydraulic forces to a large closing force when the valve is open to only a small extent, the valve is designed to provide for a relatively large opening force at least when the valve is commencing to open. In one construction this is achieved by passing the flow from the second to the main discharge duct through the valve member in a manner producing a jet reaction on the valve member to assist the normal regulating force on the member. In alternative arrangements the additional force is derived from an additional pressure drop induced in the flow from the delivery passage, the higher pressure being applied to valve member in a sense to increase the amount of fluid passed to overspill. | ||||||
| 235 | Rotary hydraulic device | US79770 | 1979-09-28 | US4289454A | 1981-09-15 | Hiroto Iwata |
| A rotary hydraulic device in which a pair of delivery ports of a vane pump communicate with independently separated delivery chambers, respectively, and the communication between one of the delivery chamber and a hydraulic machine is shut off after the flow rate of delivery fluid from the delivery port exceeds a certain level with the increase in the speed of rotation of the pump. The excess fluid from the delivery port is returned to the tank side which causes the decrease of the supply flow rate in the zone of high speed rotation of the pump and also the reduction of power consumption so that the rotary hydraulic device of the invention is especially suitable for the power steering devices of vehicles. | ||||||
| 236 | Pump assembly incorporating vane pump and impeller | US747501 | 1976-12-06 | US4247263A | 1981-01-27 | Karl H. Pech; George W. Jahrstorfer |
| A fuel pump assembly for supplying fuel to a gas turbine engine has a centrifugal pump, including an impeller, that furnishes the necessary pressure for engine operation at high engine speeds. A vane pump, attached to the back side of the impeller of the centrifugal pump, supplies fuel to the engine for starting and acceleration to idle. The vane pump is of the type having a stationary centrally disposed cam and an annular rotor with radially inwardly directed vanes which ride over the surface of the cam. Before idle speed is attained, the vanes which are substantially hydraulically balanced and made of a light plastic material are adapted to lift off the surface of the cam without the need of pressure relief behind the vanes. | ||||||
| 237 | Efficiency fluid pumping system including sequential unloading of a plurality of pumps by a single pressure responsive control valve | US959036 | 1978-11-08 | US4245964A | 1981-01-20 | George C. Rannenberg |
| In a fluid pumping system in which a fluid is pumped from a fluid supply to a load, two continuously driven fixed displacement pumps are operated in parallel to provide the pumping action. The two pumps are arranged with a common inlet, and with a common outlet, the flow delivered to the load from one of the two pumps passing through a check valve upstream of the common outlet. The fluid flow is regulated to provide a constant pressure by sequentially bypassing fluid around each pump through separate pump bypass ducts. This sequential fluid bypassing or pump unloading is effected by a single control responsive to the flow requirements of the load necessary to maintain that constant pressure. The pump whose delivered flow outlet contains the check valve is the pump whose flow is bypassed initially when less than full pumping capacity is desired. During maximum flow demand operation, both pumps are delivering against full delivery pressure. During low flow demand operation only the pump without the check valve delivers against full pressure, the other pump being operated with essentially no pressure load. In a preferred embodiment the pump which contains the check valve is of considerably larger displacement than the other pump. The result is a pumping system with significantly reduced pump input power during periods of low flow demand. | ||||||
| 238 | Multiple displacement pump system with bypass controlled by inlet pressure | US878010 | 1978-02-15 | US4222712A | 1980-09-16 | Melvin F. Huber; Lowell D. Hansen |
| A multiple displacement pump system and method utilizing a single fixed displacement pump having pumping elements providing both first and second sets of pumping chambers. Circuit means having a fluid utilization conduit provides for delivery of fluid to said fluid utilization conduit which is either the sum of fluid delivered from both sets of pumping chambers or from only one set of pumping chambers. Additionally, the circuit means includes various alternate forms of control dependent upon pressure in a part of the system or on speed of a mechanism utilizing the pumped fluid to establish conditions wherein fluid delivered by the system is at either a desired flow rate or within a range of flow rates at different pressures. | ||||||
| 239 | Fluid pumping system | US826090 | 1977-08-19 | US4204811A | 1980-05-27 | William L. Carter; Jack F. Greathouse; Philip T. Zeilinger |
| A fluid pumping system comprises a fluid pump having multiple fluid outlet flows coupled to relatively low and high pressure loads. A control valve system controls the pressure levels of the low and high pressure flows, and relieves excess fluid from the high pressure flow to the low pressure flow to augment the low pressure flow. | ||||||
| 240 | Multiple displacement pump system and method | US470988 | 1974-05-17 | US3953153A | 1976-04-27 | Melvin F. Huber; Lowell D. Hansen |
| A multiple displacement pump system and method utilizing a single fixed displacement pump having pumping elements providing both first and second sets of pumping chambers. Circuit means having a fluid utilization conduit provides for delivery of fluid to said fluid utilization conduit which is either the sum of fluid delivered from both sets of pumping chambers or from only one set of pumping chambers. Additionally, the circuit means includes various alternate forms of control dependent upon pressure in a part of the system or on speed of a mechanism utilizing the pumped fluid to establish conditions wherein fluid delivered by the system is at either a desired flow rate or within a range of flow rates at different pressures. | ||||||
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