US3695783A - Means for regulating power for pumps - Google Patents

Means for regulating power for pumps Download PDF

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Publication number
US3695783A
US3695783A US86412A US3695783DA US3695783A US 3695783 A US3695783 A US 3695783A US 86412 A US86412 A US 86412A US 3695783D A US3695783D A US 3695783DA US 3695783 A US3695783 A US 3695783A
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Prior art keywords
pump
conduit
pumps
pressure
regulating
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Expired - Lifetime
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US86412A
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English (en)
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Ingebret Soyland
Kristian Soyland
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel

Definitions

  • variable volume-flow pumps the power take-off can be regulated by decreasing the volume-flow by degrees as the pressure requirement-increases. In this manner it is possible, when idling or when the power requirement is slight, to achieve rapid movement without thereby requiring a relatively large prime mover. This'has not previously been possible when using constant volume-flow pumps for power transmission.
  • the object of the present invention is to provide a means which, in'a simple manner, permits use of constant volume-flow at low pressure and less volume-flow at higher pressure.
  • the advantage of power regulated pumps in for example, digging machines, loading machines and the like, is the improved utilization of the effect of the prime mover. It is possible to achieve greater velocities when idling, and with small loads, with a relatively small power motor. Without power regulation, the power motor must be dimensioned such as to' have sufficient power to operate the pump (or pumps) at maximum volume-flow and maximum pressure. This entails utilization of the power motor only in cases where the working members require maximum pressure. When the working members require low. pressure, the motor is only partially loaded and thus, in effect, over dimenv sioned.
  • FIG. 1 is a diagrammatic view illustrating one embodiment of the invention.
  • FIG. 2 is a similar view of a second embodiment.
  • FIG. 1 shows a system having two constant volumeflow pumps which supply a pressure medium to two separate connections.
  • the pumps are operated by a common motor M with a determined effect-E.
  • pumps of different sizes are selected, in which pump PF] is larger than pump PF2. As will be apparent from the further description, this is necessary if both service circuits are to receive pressure medium after the regulation is carried out.
  • the main circuits as shown in Fig. l, are constructed in the well-known mannerin whichthe pumps PFl AND PF2 supply medium from atank 3 through suction conduits 4, 7.'The pressure medium flows further through pressure conduits 5, 9 to distribution'valves l and 2.
  • the distribution valves When the distribution valves are not being operated, and are thusin neutral position, the medium flows to the tankvia-a returnconduit '6.
  • the distribution valves-are operated to one or other end position the pressure medium flows to consumers A and B, and, from the consumers, returns to the tank 3.
  • the valve which, in an inoperative state, closes the communication between the conduits l0 and 12.
  • the valve has a hydraulic operation unit 17 which, on supply of pressure medium, opens the valve againsta spring 18.
  • the spring force may be adjusted by means of an adjusting screw-19,'so that the valve opens-at a determined'pressure In the system shown in'Fig. 1, pressure will arise in conduits 5 and -9 when the valves are operated so that the consumers carry out the work. If the conduits 5 and 9 contain unequalpressure, a pressure'medium flow through control conduit 13 and the throttles l4 and 15 -will takeplacei-Pressuredrop thus occurs overthese throttles.
  • the relation between these throttles 14 and 15 is determined so that the pressure arising in conduit 16 represents the common effect of the pumps Pfl and H2. If the volume-flow of the pumps PF 1 and PF2 is signified by Q1 and Q2 respectively, and the pressure P1 and P2 respectively, the following equation is achieved where Ps is the pressure arising in the conduit 16.
  • the switching over of the valve 11 allows communication between the conduits 10 and 12 so that pressure medium from conduit 5 flows over to suction conduit 7.
  • the one-way valve 8 prevents the pressure medium from flowing back to the tank 3.
  • the pump PF2 has thereby a feed pressure (suction pressure) equal to the pressure in theconduit 5.
  • the power requirementof pump PF 2 is thereby reduced to The total power requirement for both pumps after regulation beingthereby
  • the flow of pressure medium to the valve 1 is now reduced to (Q1 Q2) while the flow of medium to valve 2 remains the same as before.
  • the working pressure may now be increased further until maximum motor effect is achieved.
  • the volume-flow in the control conduit 13 is relatively small since the through-flow areas in the throttles l4 and 15 may be very small, usually less than 1 m/m in diameter. it will normally be possible to maintain the through-flow at below 3 percent. A loss of this size will be within the tolerance of the volume-flow of the pump.
  • the one-way valve 8 is dimensioned so as to cause the least possible pressure drop between tank and pump.
  • the regulation may also be used to advantage for regulating variable volume-flow pumps as illustrated in Fig. 2.
  • the figure shows a two-circuit system with two variable pumps PVl and Pv2.
  • the progress of the pressure medium flow is, in general features, as previously described for Fig. 1.
  • the volume-flow from a variable pump may, as is known, be varied by altering the angle of the oblique plate (thrust plate) so that the length of the piston stroke is increased or decreased.
  • the regulating member consists of a single-acting cylinder 20 and 21 for pumps PV] and PV2, respectively.
  • a spring 22, 23 holds piston 24, 25 in a neutral position.
  • the piston is in direct communication with the oblique plate of the pump via arm 26, 27.
  • the regulating cylinder is in a neutral position, the pump is adjusted to supply maximum volume-flow.
  • pressure arises in control conduit 28, 29, the force on pressure side 30, 31 of the piston 24, 25 will increase.
  • this force exceeds the spring force, the piston will move until there is balance between the spring force and pressure force. This movementis transmitted via arm 26, 27 to the oblique plate of the pump and adjusts the angle thereof;
  • the regulating pressure is produced in the same manner as described for Fig. 1.
  • pressure occurs in main conduits 32, 33 in accordance with the power requirement of the consumers A, B. This pressure is transmitted via the throttles 14' and to the control conduit 13.
  • the regulating cylinders 20 and 21 are not directly included in the invention since they are of a type known per se.
  • a hydraulic system for earth moving equipment for controlling at least two movable components thereof, including a separate circuit for each movable component, each circuit comprising a pump, a suction conduit between a source of hydraulic medium and the pump inlet, a pressure conduit between the pump outlet and the movable component, a return conduit between the movable component and the source, motor means for driving the pump, a regulating means for the pumps, said regulating means including a cross conduit providing communication between the pressure conduits downstream of the pump outlets, throttles for the cross conduit, a regulating component, and a control conduit providing communication between the cross conduit intermediate the throttles and the regulating component for operating the regulating component.
  • each pump is a constant volume-flow pump and the regulating member is a hydraulically operated valve controlling conduits leading from the valve to the pressure conduit of one pump down-stream of the pump outlet and a second conduit leadingfrom the valve to the suction conduit of the other pump upstream of the pump inlet and a one-way valve in the suction conduit of the other pump to prevent the hydraulic medium flowing back to the source.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US86412A 1969-12-03 1970-11-03 Means for regulating power for pumps Expired - Lifetime US3695783A (en)

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NO477769 1969-12-03

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US86412A Expired - Lifetime US3695783A (en) 1969-12-03 1970-11-03 Means for regulating power for pumps

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US (1) US3695783A (enrdf_load_stackoverflow)
DE (1) DE2054197A1 (enrdf_load_stackoverflow)
GB (1) GB1335536A (enrdf_load_stackoverflow)
SE (1) SE369948B (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873241A (en) * 1972-07-10 1975-03-25 Komatsu Mfg Co Ltd Variable output gear pump and motor
US3891354A (en) * 1973-06-22 1975-06-24 Bosch Gmbh Robert Regulating system for pumps
US3910044A (en) * 1973-08-24 1975-10-07 Case Co J I Hydraulic summating system
US3924971A (en) * 1974-01-30 1975-12-09 Poclain Sa Device for regulating the supply of pressurized fluid of two circuit systems having at least two pumps of constant cubic capacity
US3985472A (en) * 1975-04-23 1976-10-12 International Harvester Company Combined fixed and variable displacement pump system
US4008004A (en) * 1975-12-22 1977-02-15 Abex Corporation Control system for variable displacement pumps
US4029439A (en) * 1975-12-22 1977-06-14 Abex Corporation Control system for variable displacement pumps
US4089170A (en) * 1977-05-09 1978-05-16 Caterpillar Tractor Co. Power conservation means for variable displacement pump fluid supply system
US4545202A (en) * 1983-10-24 1985-10-08 Sundstrand Corporation Pressure-regulating system
US5228289A (en) * 1983-06-29 1993-07-20 Peter Norton Plural hydraulic pump system with unloading valve
US6109030A (en) * 1998-02-13 2000-08-29 Sauer Inc. Apparatus and method for ganging multiple open circuit pumps
US20050180855A1 (en) * 2002-06-11 2005-08-18 Daikin Industries, Ltd. Pump unit
US20080260545A1 (en) * 2004-03-12 2008-10-23 Poul Spaerhage Frokjaer Variable Capacity Oil Pump
US20100018505A1 (en) * 2008-07-24 2010-01-28 Gm Global Technology Operations, Inc. Method and apparatus for supporting stop-and-go engine functionality
CN101280845B (zh) * 2007-04-03 2013-01-02 通用汽车公司 用于多速变速器的分压复式泵液压流体供应系统及方法
US20220060235A1 (en) * 2020-08-18 2022-02-24 Qualcomm Incorporated Federated learning for client-specific neural network parameter generation for wireless communication

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215700A (en) * 1988-03-16 1989-09-27 Massey Ferguson Mfg Hydraulic circuits
AT506905B1 (de) * 2008-05-28 2011-03-15 Leobersdorfer Maschf Verfahren und vorrichtung zum fördern von gas

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599701A (en) * 1945-10-25 1952-06-10 Eaton Mfg Co Pumping system
US2655109A (en) * 1944-05-03 1953-10-13 Power Jets Res & Dev Ltd Pressure fluid supply system
US2823518A (en) * 1953-11-19 1958-02-18 Thompson Prod Inc Aircraft fuel pumping system
US2870776A (en) * 1954-06-21 1959-01-27 Sun Oil Co Liquid proportioning system
US2965036A (en) * 1957-07-08 1960-12-20 Louis S Wood Automatic dual pump single-multiple stage low-high pressure fluid supply means
US3093081A (en) * 1959-01-29 1963-06-11 New York Air Brake Co Pumping device
US3431856A (en) * 1967-02-06 1969-03-11 Continental Machines Two-stage pumping apparatus
US3526468A (en) * 1968-11-13 1970-09-01 Deere & Co Multiple pump power on demand hydraulic system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655109A (en) * 1944-05-03 1953-10-13 Power Jets Res & Dev Ltd Pressure fluid supply system
US2599701A (en) * 1945-10-25 1952-06-10 Eaton Mfg Co Pumping system
US2823518A (en) * 1953-11-19 1958-02-18 Thompson Prod Inc Aircraft fuel pumping system
US2870776A (en) * 1954-06-21 1959-01-27 Sun Oil Co Liquid proportioning system
US2965036A (en) * 1957-07-08 1960-12-20 Louis S Wood Automatic dual pump single-multiple stage low-high pressure fluid supply means
US3093081A (en) * 1959-01-29 1963-06-11 New York Air Brake Co Pumping device
US3431856A (en) * 1967-02-06 1969-03-11 Continental Machines Two-stage pumping apparatus
US3526468A (en) * 1968-11-13 1970-09-01 Deere & Co Multiple pump power on demand hydraulic system

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873241A (en) * 1972-07-10 1975-03-25 Komatsu Mfg Co Ltd Variable output gear pump and motor
US3891354A (en) * 1973-06-22 1975-06-24 Bosch Gmbh Robert Regulating system for pumps
US3910044A (en) * 1973-08-24 1975-10-07 Case Co J I Hydraulic summating system
US3924971A (en) * 1974-01-30 1975-12-09 Poclain Sa Device for regulating the supply of pressurized fluid of two circuit systems having at least two pumps of constant cubic capacity
US3985472A (en) * 1975-04-23 1976-10-12 International Harvester Company Combined fixed and variable displacement pump system
US4008004A (en) * 1975-12-22 1977-02-15 Abex Corporation Control system for variable displacement pumps
US4029439A (en) * 1975-12-22 1977-06-14 Abex Corporation Control system for variable displacement pumps
US4089170A (en) * 1977-05-09 1978-05-16 Caterpillar Tractor Co. Power conservation means for variable displacement pump fluid supply system
US5228289A (en) * 1983-06-29 1993-07-20 Peter Norton Plural hydraulic pump system with unloading valve
US4545202A (en) * 1983-10-24 1985-10-08 Sundstrand Corporation Pressure-regulating system
US6109030A (en) * 1998-02-13 2000-08-29 Sauer Inc. Apparatus and method for ganging multiple open circuit pumps
US20050180855A1 (en) * 2002-06-11 2005-08-18 Daikin Industries, Ltd. Pump unit
EP1533525A4 (en) * 2002-06-11 2005-09-14 Daikin Ind Ltd PUMP UNIT
US7399165B2 (en) 2002-06-11 2008-07-15 Daikin Industries, Ltd. Pump unit with multiple operation modes
US20080260545A1 (en) * 2004-03-12 2008-10-23 Poul Spaerhage Frokjaer Variable Capacity Oil Pump
CN101280845B (zh) * 2007-04-03 2013-01-02 通用汽车公司 用于多速变速器的分压复式泵液压流体供应系统及方法
US20100018505A1 (en) * 2008-07-24 2010-01-28 Gm Global Technology Operations, Inc. Method and apparatus for supporting stop-and-go engine functionality
US7690344B2 (en) * 2008-07-24 2010-04-06 Gm Global Technology Operations, Inc. Method and apparatus for supporting stop-and-go engine functionality
US20100100301A1 (en) * 2008-07-24 2010-04-22 Qi Ma Method and apparatus for supporting stop-and-go engine functionality
US7784441B2 (en) 2008-07-24 2010-08-31 Gm Global Technology Operations, Inc. Method and apparatus for supporting stop-and-go engine functionality
US20220060235A1 (en) * 2020-08-18 2022-02-24 Qualcomm Incorporated Federated learning for client-specific neural network parameter generation for wireless communication
US11909482B2 (en) * 2020-08-18 2024-02-20 Qualcomm Incorporated Federated learning for client-specific neural network parameter generation for wireless communication

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Publication number Publication date
SE369948B (enrdf_load_stackoverflow) 1974-09-23
GB1335536A (en) 1973-10-31
DE2054197A1 (de) 1971-06-09

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