EP0032300A1 - Druckflüssigkeits-Regelsystem - Google Patents

Druckflüssigkeits-Regelsystem Download PDF

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Publication number
EP0032300A1
EP0032300A1 EP80304547A EP80304547A EP0032300A1 EP 0032300 A1 EP0032300 A1 EP 0032300A1 EP 80304547 A EP80304547 A EP 80304547A EP 80304547 A EP80304547 A EP 80304547A EP 0032300 A1 EP0032300 A1 EP 0032300A1
Authority
EP
European Patent Office
Prior art keywords
fluid
check valve
pump
cylinder
fluid conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP80304547A
Other languages
English (en)
French (fr)
Inventor
Jeremy Joseph Fry
Christopher Warnett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rotork Controls Ltd
Original Assignee
Rotork Controls Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rotork Controls Ltd filed Critical Rotork Controls Ltd
Publication of EP0032300A1 publication Critical patent/EP0032300A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/005—With rotary or crank input
    • F15B7/006—Rotary pump input
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible

Definitions

  • This invention relates to a fluid system for controlling the operating functions of a motor device, such as an actuator.
  • a motor device such as an actuator.
  • the invention is concerned with the provision of an improved hydraulic system for controlling the operating functions of the movable member of an actuator, for example, the piston of a double acting cylinder and piston unit.
  • An object of the invention is to provide a fluid control system which includes a bi-rotational pump connected with the opposite ends of the cylinder of an actuator device so as to move the piston therein in one or the other direction in the cylinder depending on the selected direction of rotation of the pump..
  • a further more specific object of the invention is to provide valving in the fluid control circuits so as to prevent back pressure from the cylinder driving the pump in the event of the application of an outside force to the piston rod.
  • a still further object of the invention is to provide means for avoiding a hydraulic lock situation in the event that the output pressure from the pump drops below the back pressure from the cylinder of the actuator device.
  • the invention provides a fluid system for controlling the operation of an actuator consisting of a cylinder containing a piston movable therein, the opposite ends of said cylinder being connected each with an opposite output of a bi-directional pump through a one-way pressure check valve preventing return flow of fluid from said one cylinder end to said pump, said system being further characterised in that each end of said cylinder is furthermore connected to a fluid reservoir through a check valve which is normally open to permit flow of fluid from said cylinder end to said reservoir but which is adapted to close in response to a predetermined increase in pressure between the corresponding pump output and its one-way pressure check valve.
  • piston rod R is slidably movable in a double acting cylinder B, the ends of which are provided with ports B 1 , B 2 for the connection thereto of the hydraulic control system of the invention.
  • the piston rod R extends from one end of the cylinder B and is connected to a device to be actuated such as a valve.
  • the hydraulic control system comprises a pump C which is a bi-directional rotary gear pump with a high leakage rate across the gears.
  • the pump is preferably rotated manually, but may be motor driven.
  • the port B 1 at one end of the cylinder B is connected with one output C 1 of the pump C by a hydraulic line which includes a normally closed one-way pressure check valve D 1 .
  • the valve D 1 is a relatively high crack pressure check valve operable, for example, at a pressure of about 401bs. per square inch.
  • the hydraulic line between the port B 1 and check valve D 1 may further include a flow control valve A 1 which is adjustable to vary
  • the actuator is a double acting, hydraulically operated cylinder and piston unit and flow control valves may be located in the circuit lines to the cylinder so as to provide a speed control for the movement of the piston.
  • a piston P having a draws fluid from the reservoir G through one-way check valve F 2 which now opens and pressure fluid is then pumped at the output C of the pump.
  • the outlet pressure of the fluid from the pump C closes check valve F 1 to the reservoir G and when the pressure reaches approximately one half the crack pressure of the check valve D 1 , the pressure also communicated to valve E 1 closes the valve E 1 so isolating the corresponding end of cylinder B from the reservoir G.
  • the valve D 1 opens at its rated pressure and the pressure then builds up in the corresponding right hand end of cylinder B. At this time fluid in the left hand end of cylinder B is able to travel freely from the cylinder via port B 2 to the reservoir G through the open check valve-E 2 so that the piston P will move to the left and retract the piston rod R.
  • the system works in a similar manner to extend the piston rod R from the cylinder the speed of operation of the system, and the line is additionally connected to the reservoir G through a normally open pilot operated check valve E 1 .
  • the hydraulic line between the pressure check valve D 1 and pump output C 1 is connected firstly, with the reservoir G through a one-way check valve F 1 ; and secondly, with the check valve B 1 on that side of the check valve remote from the reservoir.
  • the hydraulic control system of the invention is completed by similar hydraulic connections and valves between the port B 2 at the other end of the cylinder B and the other outlet C 2 of the pump, the various valves being given the corresponding reference letters with the suscript 2.
  • the hydraulic system as shown in Figure '1 is in an inoperative position.
  • the pump has been manually operated to energize the pump C so that it rotates clockwise in the direction of the arrow.
  • the pump C when the pump C is operated in the opposite anti-clockwise direction.
  • Speed control of the system may be obtained by adjustment of the flow control valves A 1 and A 2 .
  • the check valves D 1 , D 2 prevent the fluid from reaching the pump C and thereby driving it as a motor.
  • Manual operation of the pump C in this situation could produce enough pressure in the pilot valve line to keep the pilot operated normally open check valves E 11 E 2 in a closed position thus causing a hydraulic lock.
  • the control system of the invention avoids this problem due to the fact that upon cessation of manual operation of the pump handle, the pressure drop due to leakage across the pump is sufficiently high to cause an instantaneous opening of the pilot operated check valves E 1' E 2 so that a hydraulic lock is avoided.
  • the one-way check valves D 1 and D 2 may be each combined as a single, unitary valve structure with its corresponding check valve E 1 and E 2 .
  • the single valve structure may comprise a ported valve having a valve member which is slidably movable in response to the pump pressure firstly to isolate the reservoir drain line and secondly to open the line between the pump and the corresponding end of the cylinder.
  • the actuator may be of the rotary vane type, the movable piston member in such an arrangement comprising a vane angularly movable in a quadrant-shaped cylinder through an arc of approximately 90°

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP80304547A 1980-01-14 1980-12-17 Druckflüssigkeits-Regelsystem Withdrawn EP0032300A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8001193 1980-01-14
GB8001193 1980-01-14

Publications (1)

Publication Number Publication Date
EP0032300A1 true EP0032300A1 (de) 1981-07-22

Family

ID=10510622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80304547A Withdrawn EP0032300A1 (de) 1980-01-14 1980-12-17 Druckflüssigkeits-Regelsystem

Country Status (4)

Country Link
EP (1) EP0032300A1 (de)
JP (1) JPS56101405A (de)
AU (1) AU6596181A (de)
ZA (1) ZA808017B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291654A1 (de) * 1987-05-21 1988-11-23 Ribaudo Vertical Systems Co. Hydraulisches Tür-Öffnungs/Schliess-System
US5107677A (en) * 1987-05-21 1992-04-28 Vertran Manufacturing Company Hydraulic door actuator
US5161957A (en) * 1987-05-21 1992-11-10 Vertran Manufacturing Company Hydraulic door actuator
FR2687206A1 (fr) * 1992-02-12 1993-08-13 Berruyer Jean Jacques Dispositif de commande pour vannes.
WO1996012108A1 (en) * 1994-10-13 1996-04-25 Applied Power Inc. Hydraulic operating device and gearbox provided with such an operating device
EP0893605A1 (de) * 1997-07-23 1999-01-27 HOERBIGER GmbH "Hydraulische Betätigungsanordnung"
GB2422862A (en) * 2005-02-03 2006-08-09 Schlumberger Holdings Apparatus for actuating downhole tools
WO2008037307A1 (de) * 2006-09-25 2008-04-03 Robert Bosch Gmbh Hydrostatisches getriebe
CN105545839A (zh) * 2016-01-29 2016-05-04 贵阳海之力液压有限公司 一种油缸换向及容积调速液压系统
US9500206B2 (en) 2013-11-18 2016-11-22 Warner Electric Technology Llc Fluid pump for a linear actuator
EP2346467B1 (de) * 2008-09-24 2019-07-17 Ekso Bionics, Inc. Hüft- und kniebetätigungssysteme für orthesevorrichtungen der unteren gliedmassen
US10724553B2 (en) 2018-12-06 2020-07-28 Warner Electric Technology Llc Three position metering valve for a self-contained electro-hydraulic actuator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101301A (ja) * 1983-11-07 1985-06-05 Mitsubishi Heavy Ind Ltd シリンダの制動エネルギの再生装置
JP6247573B2 (ja) * 2014-03-19 2017-12-13 株式会社ショーワ 液圧アクチュエータ

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877347A (en) * 1973-03-13 1975-04-15 Res Engineering Company Hydraulic control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877347A (en) * 1973-03-13 1975-04-15 Res Engineering Company Hydraulic control

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0291654A1 (de) * 1987-05-21 1988-11-23 Ribaudo Vertical Systems Co. Hydraulisches Tür-Öffnungs/Schliess-System
US5107677A (en) * 1987-05-21 1992-04-28 Vertran Manufacturing Company Hydraulic door actuator
US5161957A (en) * 1987-05-21 1992-11-10 Vertran Manufacturing Company Hydraulic door actuator
FR2687206A1 (fr) * 1992-02-12 1993-08-13 Berruyer Jean Jacques Dispositif de commande pour vannes.
US5857381A (en) * 1994-10-13 1999-01-12 Applied Power Inc. Hydraulic operating device and gearbox provided with such an operating device
NL9401692A (nl) * 1994-10-13 1996-05-01 Applied Power Inc Hydraulische bedieningsinrichting en versnellingsbak voorzien van een dergelijke bedieningsinrichting.
WO1996012108A1 (en) * 1994-10-13 1996-04-25 Applied Power Inc. Hydraulic operating device and gearbox provided with such an operating device
EP0893605A1 (de) * 1997-07-23 1999-01-27 HOERBIGER GmbH "Hydraulische Betätigungsanordnung"
GB2422862A (en) * 2005-02-03 2006-08-09 Schlumberger Holdings Apparatus for actuating downhole tools
WO2008037307A1 (de) * 2006-09-25 2008-04-03 Robert Bosch Gmbh Hydrostatisches getriebe
EP2346467B1 (de) * 2008-09-24 2019-07-17 Ekso Bionics, Inc. Hüft- und kniebetätigungssysteme für orthesevorrichtungen der unteren gliedmassen
US9500206B2 (en) 2013-11-18 2016-11-22 Warner Electric Technology Llc Fluid pump for a linear actuator
US10288064B2 (en) 2013-11-18 2019-05-14 Warner Electric Technology Llc Fluid pump for a linear actuator
CN105545839A (zh) * 2016-01-29 2016-05-04 贵阳海之力液压有限公司 一种油缸换向及容积调速液压系统
US10724553B2 (en) 2018-12-06 2020-07-28 Warner Electric Technology Llc Three position metering valve for a self-contained electro-hydraulic actuator

Also Published As

Publication number Publication date
JPS56101405A (en) 1981-08-14
ZA808017B (en) 1982-02-24
AU6596181A (en) 1981-07-23

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19820627

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Inventor name: FRY, JEREMY JOSEPH

Inventor name: WARNETT, CHRISTOPHER