EP0086196A1 - Dispositif de commande electro-fluide - Google Patents

Dispositif de commande electro-fluide

Info

Publication number
EP0086196A1
EP0086196A1 EP19820900819 EP82900819A EP0086196A1 EP 0086196 A1 EP0086196 A1 EP 0086196A1 EP 19820900819 EP19820900819 EP 19820900819 EP 82900819 A EP82900819 A EP 82900819A EP 0086196 A1 EP0086196 A1 EP 0086196A1
Authority
EP
European Patent Office
Prior art keywords
valve
fluid pressure
chamber
conduit
disc
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Withdrawn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
EP19820900819
Other languages
German (de)
English (en)
Inventor
Graham Alexander Parker
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.)
University of Surrey
Original Assignee
University of Surrey
National Research Development Corp UK
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 University of Surrey, National Research Development Corp UK filed Critical University of Surrey
Publication of EP0086196A1 publication Critical patent/EP0086196A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves
    • F16K31/0624—Lift valves
    • F16K31/0634—Lift valves with fixed seats positioned between movable valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves
    • F16K31/0624—Lift valves
    • F16K31/0627—Lift valves with movable valve member positioned between seats

Definitions

  • ELECTRO-FLUID CONTROL DEVICE This invention relates to a control device responsive to an electrical input to control pressure or flow of fluid.
  • the fluid may be a liquid or a gas.
  • the device is an electro-hydraulic valve electrically energisable to control flow of a liquid under pressure from a supply for selective application to individual outputs.
  • Control devices are known in which a fluid pressure from a supply can be selectively applied to one or other of two distinct outlets by the operation of a valve element e.g. by an electric field acting on a magnetically susceptible body on or forming the valve element.
  • a valve element e.g. by an electric field acting on a magnetically susceptible body on or forming the valve element.
  • devices available hitherto have been expensive to make in view of the close tolerances for long-term reliable action. Despite care in manufacture contamination or wear can occur shortening service life and causing breakdowns with further increase in costs.
  • the electrical power that has to be applied in the region of the valve element creates problems in terms of heating and insulation.
  • an electricallyoperable fluid pressure control device including in a housing a valve chamber and fluid pressure conduits between said chamber and fluid pressure connections of the housing, the valve chamber having fluid flow ports of said conduits and in the chamber a magnetically susceptible valve arrangement movable by electromagnetic force to cooperate with one or more of said ports to selectively control fluid flow through the chamber, means to selectively apply an electromagnetic force to move the valve arrangement, the valve arrangement having two spaced-apart, magnetically susceptible, individually movable portions and a link member to transmit movement of each valve portion to the other over a section only of the range of movement of each valve portion and not transmit movement over another section of said range of movement.
  • the link member is a rigid thrust rod too short to be in movement-transmitting contact with both valve portions throughout all their ranges of movement.
  • each valve portion is a disc positioned between respective opposed fluid flow ports with a range of movement to seal one or other of the respective ports by the action of a respective face of the disc.
  • Tne link member may be in a fluid pressure conduit joining a port for one valve member with a port for the other.
  • the valve chamber has two parts spaced along a fluid pressure conduit with a disc valve portion in each chamber part positioned transversely of the conduit, and dividing it into a central part and outer parts, a central part of the conduit joining the valve chamber parts and housing a link member free of the valve discs, pdrts being formed where the central and outer parts of the conduit emerge into each chamber part, the outer parts of the conduit forming individual supply conduits from supply connections and the central part a common conduit to a drain outlet connection, the chambers also having respective fluid pressure load connections for fluid pressure flow to and from the control device in dependence on the valve portion positions, the electromagnetic means being positioned around each outer conduit for action on the adjacent valve disc.
  • valve housing is indicated at 10. This can be of any suitable shape and constructional form. Conveniently it is of three parts to ease assembly of the components. O-ring seals are used as appropriate.
  • a conduit 2 extends through the housing from end to end between fluid pressure supply connections 21, 22.
  • Two valve chamber parts 31, 32 are formed in the housing and the line of conduit 2 extends through both, a central part 25 of the conduit connects the valve chamber parts and outer conduit parts 23, 24 extend from chamber parts 31, 32 respectivley to the supply connections 21, 22.
  • a common drain conduit 26 extends from central conduit part 25 to a drain outlet connection 29. Load connections 27, 28 are provided for each valve chamber part.
  • the conduit 2 forms ports where it emerges into each valve chamber part. Conveniently each port projects into the chamber as a nozzle.
  • valve portions are provided in each valve chamber part, 51 in part 31 and 52 in part 32.
  • the valve portions are discs, conveniently circular in plan, formed partly or wholly of magnetically susceptible material, such as Swedish (soft) iron annealed after fabrication to produce the magnetic properties appropriate to the duty.
  • Each disc face may have a non-magnetic layer such as plastic film of MYLAR(RTM), to improve release from a port on removal of an applied magnetic field.
  • the discs are free to "float" in the valve chamber in the axial sense but .are conventiently a loose fit in the radial sense to provide some location of the disc.
  • a clearance of 0.001 inch to 0.002 inch is suitable. There must be a clearance for fluid flow around or through the disc, apart from the central port-closing portion.
  • valve portions 51, 52 are circular in plan with a number of small projections free each circular face spaced around the edge of the face.
  • the projections are conveniently three or four in number and form stops arranged to limit the approach of the valve element to the end walls of the valve chamber. When a valve element about 0.15 inch (4 mm) thick is used the stops are some 0.003 inch to 0.005 inch (0.1mm:) thick.
  • Electromagnetic means 61, 62 are provided for each valve portion at the outer side of each valve chamber.
  • the c ⁇ ans 61, 62 are each coils 63, 64 wound on iron cores 65, 66. For the above reasons these also may be of annealed Swedish (soft) iron.
  • the cores may have central bores to form some of the conduit 2. These central bores may be provided with brass or other non-nagnetic liners to define the outer conduits 23, 24.
  • the liners may also provide the nozzles 41 and 44. These nozzles may be arranged to deform slightly in contact with the valve portions to provide a fluid-tight contact.
  • the nozzle may be of rubber or like flexible material to achieve a similar result.
  • nozzles 41, 44 The projection of nozzles 41, 44 is some 0.003 inch to 0.005 inch while that of nozzles 42, 43 is greater to reduce hydrostatic effects between the valve poriton face and the adjacent wall around the nozzle.
  • the valve discs and electro-magnetic means are arranged so that when a coil is energised the discs are attracted to the respective nozzle and port to close the port against fluid flow, as is shown for disc 52.
  • a link member in the form of rigid rod 7 is provided in conduit portion 25. This member permits fluid flow in the conduit.
  • the member is made to be long enough to project from both of nozzles 42 and 43 but not so long as to be able to touch both discs when one is on a nozzle of the central conduit portion and the other on an outer conduit portion.
  • the clearance that exists, 71, is very important for the effective operation of the valve and is some 0.002 inch (0.05 mm) in measurement.
  • the link member is not joined to either disc in this embodiment.
  • the link member must be free to move easily in conduit portion 22.
  • Other forms of rigid link member may be used, for example a tube, while the rigid link member may be replaced by a link member able to collapse by a small amount under axial loading so that the clearance can be reduced or omitted.
  • Other possible forms include a tube able to deform slightly by central expansion with length reduction under axial load.
  • a row of ball-bearings if necessary with a cage to allow fluid flow, may also be used or a spring loaded telescopic tube arrangement.
  • Hydraulic fluid pressure is supplied to connections 21 and 22 from a suitable source, not shown.
  • Load connections 27 and 28 are connected to utilisation means (not shown) such as a hydraulic power amplifier coupled to an actuator. Drain connection 29 may be arranged to return hydraulic fluid to the source.
  • Electrical supplies are made available to the coils 63, 64 of the electromagnetic means 61, 62.
  • Switches, not shown, are provided to permit one or other or both of the coils 63, 64 to be energised. As shown in the figure coil 63 is energised and coil 64 de-energised.
  • the disc 51 is attracted by coil 63 to close off the port in nozzle 41 against the pressure of the hydraulic fluid from conduit 23.
  • Disc 52 is free to move in the absence of any electromagnetic field from coil 64 so the disc is pushed away from nozzle 44 by the fluid pressure in conduit 24 to seat on nozzle 43 and close it. Rod 7 is pushed along conduit 25 by the disc movement but does not reach to disc 51. Fluid from conduit 24 flows to connection 28 for use. Connection 27 communicates with nozzle 42 past the disc 51 seated on nozzle 41 so fluid returning from the utilisation means can flow through connection 27, chamber port 31, nozzle 42 and conduit portion 25 to drain connection 26.
  • the valve arrangement can be designed to "centre" under the fluid pressures from the fluid supply.
  • the coils can be energised with an intermittent current rather than a steady value or a shaped current waveform. It is also possible to energise the coils at different fixed or varying steady levels. Using these techniques a chosen set-point or a graduable action may be achieved.
  • the current applied to the coils may be shaped, on a time basis, to provide a high initial value, to produce "pull-in” of the valve, followed by a lower value to "hold” the valve in place. Suitable electronic current control means can readily be devised to achieve this and associated with the valve if required.
  • the energised coil also attracts the nearer disc towards it completing the movement of the disc after the further disc has sealed off the conduit portion 25 and ceased to push on rod 7.
  • the thrust from the initial radial flow on the released disc transmitted through the link member followed by the action of the electromagnetic field produces a rapid reliable switching action.
  • the design of the nozzles and their spacing and the disc-rod clearance clearly affect this action and the design of a device for any specific use must take account of these.
  • the nozzles are arranged to project into the valve chamber. Firstly this allows for as much pressure balancing as possible between the disc face areas during the steady-state condition of the device and secondly limits the adherence of the disc to the coil face on de-energisation of the coil.
  • the nozzle seat areas are therefore also significant for any design.
  • the illustrated embodiment has valve discs above 1 inch (25 mm) in diameter and 0.15 inch (4 mm) thick, excluding the projections.
  • the conduit parts 23, 24 are about 0.06 inch (1.5 mm) diameter and the central part 25 is sized to produce an equivalent cross-section around link member 7.
  • the coil power is some 30 to 40 watts, typically 20 to 30 volts at 1 to 11 ⁇ 2 amps in a 20 ohm coil. This produces a pull of some 20 to 50 lbs on the valve disc.
  • the device can operate with fluid pressures of 100 bar (1500 psi) at flow rates of 25 litres per minute.
  • Embodiments of the invention as described above have been successfully operated at switching rates of 100 Hz using air as the fluid and 50 Hz using hydraulic oil. This fast action is obtained without resort to a complex construction with many close tolerances and therefore high cost.
  • the essentially OK/OFF nature of the control signals required makes the valve most suitable for use with the electronic, two-condition signals used by modern digital electronic equipment and simplifies the interface with such equipment.
  • the switching action may be of pulse width modulated form, that is the ON and OFF energisation conditions can be of adjustable duration to achieve a particular flow balance between the load connections 27 and 28.
  • the high rate, or frequency, of switching possible is also useful in avoiding the excitation of mechanical resonances in the valve.
  • the device does not have any small orifices and this is an advantage for hydraulic systems as the device is thereby relatively insensitive to contamination.
  • the working fluids need not be lubricants, e.g. water/hydraulic oil mixtures are usable.
  • the device described has 4 ports (supply, drain, two load) and two positions and is a 4-way, 2-position valve in fluid control technology terms. More complex or different valve actions can be obtained from modifications of the illustrated device and by other electrical control actions.
  • a 4-way, 3-position valve can be provided, for example, as the two valve discs are not rigidly linked.
  • the device described is thus capable of high-speed reliable operation, without being subject to high construction costs and close tolerance, and can cope with a wide range of working fluids, gas or liquid. It is also possible to produce compound valves using the above techniques. For example a pair of devices as described above but each with valve elements of two sizes could be arranged with the supply connections for the smaller valve elements connected together and to a common supply. The load connections from the valve chamber parts for these adjacent elements then provide the load connections for the arrangement while both the existing drain connections are used.
  • This provides a valve arrangement which has a remotely operable centre section. This section can be selected to form a closed centre, a fully open centre or a centre open on one side or the other.
  • a single device with valve elements of different sizes if required, can be arranged as an on/off 3-way valve by closing one load connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

Un dispositif de commande de la pression d'un fluide fonctionnant electriquement (10) comprend des elements de vanne qui sont des disques sensibles magnetiquement (51, 52) actionnes par des electro-aimants a bobine en forme de pot (63, 64) pour fermer ou ne pas fermer simultanement ou pas, des orifices respectifs (41, 44). Lorsqu'ils ne ferment pas ces orifices, les disques peuvent fermer d'autres orifices (42, 43) mais pas tous a la fois, en raison de l'opposition d'un organe de liaison (7) qui est egalement effectif pour aider la mise hors siege d'un disque de l'orifice respectif (42 et 43) lorsque l'autre disque s'approche. La vitesse et la fiabilite du fonctionnement sont obtenues avec cette construction a l'aide d'une fabrication relativement simple et non critique. Le fluide peut etre du gaz ou du liquide p.ex. de l'eau/de l'huile hydraulique etant donne qu'il n'y a pas de surface de coulissement ayant des tolerances serrees.
EP19820900819 1981-03-25 1982-03-23 Dispositif de commande electro-fluide Withdrawn EP0086196A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8109363 1981-03-25
GB8109363 1981-03-25

Publications (1)

Publication Number Publication Date
EP0086196A1 true EP0086196A1 (fr) 1983-08-24

Family

ID=10520648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820900819 Withdrawn EP0086196A1 (fr) 1981-03-25 1982-03-23 Dispositif de commande electro-fluide

Country Status (2)

Country Link
EP (1) EP0086196A1 (fr)
WO (1) WO1982003431A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29822959U1 (de) 1998-12-23 1999-05-12 Buerkert Werke Gmbh & Co Steuerelement für Fluid

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498330A (en) * 1967-03-27 1970-03-03 Burroughs Corp High-speed pneumatic valve
NL6914601A (fr) * 1968-10-01 1970-04-03
GB1307820A (en) * 1969-04-19 1973-02-21 Zadow H Fluid flow control valves
DE2209206A1 (de) * 1972-02-26 1973-08-30 Mainz Gmbh Feinmech Werke Hydraulisches wegeventil mit elektromagnetisch betaetigtem steuerschieber
CH575076A5 (fr) * 1974-03-06 1976-04-30 Voelki Walter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8203431A1 *

Also Published As

Publication number Publication date
WO1982003431A1 (fr) 1982-10-14

Similar Documents

Publication Publication Date Title
KR101116347B1 (ko) 차동 보조 복귀 장치를 구비한 직접 작동식 공압 밸브
JP3703147B2 (ja) ディジタル二方、三方、及び四方ソレノイド制御弁
US3443585A (en) Magnetically operated multi-valve assembly
JP3837672B2 (ja) 電気油圧比例減圧−リリーフ弁
CA2551987C (fr) Soupape a commande pneumatique
US5474107A (en) Fail-open solenoid actuated valve
US5022629A (en) Valve construction
JP4294776B2 (ja) 統合電気油圧アクチュエーター
US5520217A (en) Directional valve
US4848725A (en) Valve construction
US6786236B2 (en) Electrohydraulic servo valve
WO1995006835A1 (fr) Soupape actionnee par electroaimant a position ouverte en cas de panne
GB2096283A (en) Electro-fluid control device
EP0086196A1 (fr) Dispositif de commande electro-fluide
JPH0222275B2 (fr)
US2918042A (en) Solenoid controlled fluid actuated holding device
JPS6376975A (ja) 流体圧作動装置および流体圧作動方法
US2996078A (en) Jet assisted sleeve valve
US3774642A (en) Push-pull linear motor
US7255132B2 (en) Control valve for controlling flow of hydraulic fluid
US4475441A (en) Electrohydraulic set device
WO1985003556A1 (fr) Servo-soupape pneumatique (soupape de reglage)
CN220646874U (zh) 两位三通阀
US4385642A (en) Bi-stable electrically operated valve
JPH04506697A (ja) 流体システムにおいて使用するための改良されたサーボ弁装置

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

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

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830506

AK Designated contracting states

Designated state(s): DE FR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: UNIVERSITY OF SURREY

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870103

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PARKER, GRAHAM ALEXANDER