WO2001077555A1 - Vanne basse pression - Google Patents

Vanne basse pression Download PDF

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Publication number
WO2001077555A1
WO2001077555A1 PCT/GB2001/001660 GB0101660W WO0177555A1 WO 2001077555 A1 WO2001077555 A1 WO 2001077555A1 GB 0101660 W GB0101660 W GB 0101660W WO 0177555 A1 WO0177555 A1 WO 0177555A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve apparatus
conduit
actuator
directions
apertures
Prior art date
Application number
PCT/GB2001/001660
Other languages
English (en)
Inventor
Simon Powell
Original Assignee
Pbt (Ip) Limited
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 Pbt (Ip) Limited filed Critical Pbt (Ip) Limited
Priority to AU46725/01A priority Critical patent/AU4672501A/en
Publication of WO2001077555A1 publication Critical patent/WO2001077555A1/fr

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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
    • F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
    • F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0218—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with only one sealing face

Definitions

  • the present invention relates to a fluid flow regulator, and in particular to a fluid flow regulator which must be responsive to at least two conditional states as inputs.
  • Gas ovens differ from boilers because the system works by adjusting the rate of heat input, rather than setting a fixed temperature. This process is traditionally achieved through the mechanical adjustment of the preload on the spring system and the opposition of that spring by an expanding member such as a hydraulically operated diaphragm.
  • the balanced system such as is used in gas ovens has disadvantages in that it restricts the choice for the layout of systems such as gas cookers and ovens because the user input control has to have direct interaction with the heat sensitive means so that the spring force on the opening side can be manually adjusted. It is known that these problems can be alleviated by the use of servo motors and similar electrical devices, but the cost of such devices is prohibitive compared to the mechanical solutions. Similarly, the use of electronic means for sensing the temperature to replace the hydraulically operated mechanical system currently common in such applications presents cost challenges due to the need to
  • PZT actuators have the characteristic of relatively good proportionality, being substantially responsive to the voltage applied across them. However devices exhibiting large force generate very small movements, typically a few microns. Devices with relatively large movements for active materials are only capable of displacements of approximately 2mm, and then the force output is small. A typical bender with 2mm deflection will only have a force output of 0.2- 0.5N. There is a also need for a configuration of gas control which can be powered by piezo ceramic or similar active material actuators that is also responsive to the temperature conditions within the oven. Such a device must also be capable of failing to the off condition irrespective of the temperature within the oven and be able to turn on and off independently of those temperature conditions.
  • the present invention improves upon the above and addresses the above problems by providing a valve apparatus comprising: at least one conduit, and a conduit closure means moveable between a first position when the conduit is open and at least one further position where the conduit is at least partially closed; characterized in that said conduit closure means is further arranged to be independently moveable back and forth in at least two different directions.
  • the apparatus comprises a base member having a first major surface and at least one aperture formed therethrough to provide the conduit; and the conduit closure means comprises: a slide member arranged to slidably engage the first major surface of the base member, and further provided with one or more apertures extending therethrough; wherein in the first position the apertures of the base member and the slide member are aligned, and in the at least one further position the apertures are not aligned.
  • the major surface of the slide member is arranged to slidably engage with the major surface of the base member such that the slide member may slide over the base surface in at least two directions.
  • these directions are linear, and preferably orthogonal.
  • one direction may be a rotational movement, and the other direction a linear movement, in which case one or other or both of the base member or slide member is preferably of annular or partially annular cross-section.
  • the apertures need not all be of the same shape, and may vary in shape in the direction(s) of slidable movement of the slide member over the base member.
  • a sliding face valve assembly comprising a quantity of rectangular slots whose combined surface area is equivalent to the surface area of the pipe entering the assembly. In a standard domestic oven this pipe would be
  • each rectangular slot is determined by the available motion from the actuators to be used within the system for example the Y dimension shall be approximately
  • the X dimension shall be set by the motion available from a thermally responsive mechanism, such as an hydraulically operated diaphragm or a bi-metallic actuator.
  • the second motion can also be from a second piezo ceramic actuator whose displacement is determined by the application of a thermal input, via some form of simple comparator.
  • Figure 1 illustrates a first embodiment of the present invention
  • Figure 2 shows the alignment of the apertures in a first mode of operation of the first embodiment of the present invention
  • Figure 3 shows the alignment of the apertures in a second mode of operation of the first embodiment of the present invention
  • Figure 4 shows the alignment of the apertures in a third mode of operation of the first embodiment of the present invention
  • Figure 5 shows the alignment of the apertures in a fourth mode of operation of the first embodiment of the present invention
  • Figure 6 shows a variation of the arrangement of the apertures of the present invention
  • Figure 7 shows an alternative embodiment of the present invention
  • Figure 8 shows an exploded perspective view of a practical arrangement of the first embodiment of the present invention.
  • a base plate (10) having appropriately dimensioned apertures (20) spaced in a suitable pattern with sufficient material between them to accommodate a further identical aperture, plus a border.
  • a 1.5mm square aperture will have approximately 3mm between itself and neighbouring apertures in all directions.
  • the top surface of the base plate (10) is flat and is made so by any suitable process such as lapping or precision grinding.
  • a moving plate (30) is further provided, which has the same pattern of slots as the apertures provided in the base plate (10). The moving plate (30) is assembled with respect to the base plate (10) such that the (30) lower major surface of the moving plates (30) is in sliding engagement with the upper major surface of the base plate (10).
  • the moving plate when assembled with the base plate the moving plate is positioned such that when the two parts are in a rest position referenced by two stops (40) and a resetting spring (50) the slots on the plate align in the X direction but not in the Y direction as shown in Fig 1(a). Furthermore, again as shown in Fig 1(a), the moving plate is provided with spring bearing surface 32 against which the resetting spring (50) bears, the base plate (10) being provided with a corresponding spring bearing surface (12).
  • the resetting spring (50) is disposed in compression between the spring bearing surface (12) on the base plate and the spring bearing surface (32) on the moving plate, and acts to keep the moving plate pressed against the reference stops (40) in the rest position.
  • the valve apparatus of the first embodiment further includes a first actuator arranged to act on the moving plate to move the plate against the spring force from the resetting spring in the x-direction. Furthermore, a second actuator is also provided arranged to act on the moving plate to move the plate against the spring force from the resetting spring in the y-direction.
  • the first actuator is preferably a thermally responsive mechanism such as an hydraulically operated diaphragm, or a bi-metallic actuator, both of which are in themselves known in the art, or could also be a piezo-ceramic actuator where displacement is determined by the application of a thermal input, via, for example, a simple comparator circuit.
  • Suitable piezo-ceramic actuators are also known per se in the art, such as, for example, our own earlier actuator as previously described in WO99/62088.
  • the first actuator is referred to hereafter as the "thermal" actuator.
  • the second actuator to provide movement in the y- direction is preferably a piezo-ceramic actuator, and is referred to hereafter as such.
  • the dimensions of each slot are determined by the available motion from the chosen actuators.
  • the available motion from such actuators is commonly of the order of 2mm.
  • the dimensions of the slots are chosen to be 75% of the obtainable movement, ie 1.5mm.
  • the slots in the base plate and moving plate can have the same dimension in each direction.
  • the slots are preferably dimensioned in each direction to correspond to approximately 75% of the movement available in each direction from each respective actuator.
  • the number of slots provided in the base plate and moving plate is determined by the combined area of the slots, with respect to the cross- sectional area of any input conduit to the apparatus. Preferably, the number of slots is chosen such that the sum of their areas approximately equals that of the cross-sectional area of the input pipe. In the preferred embodiment four such slots are provided in both the base plate and moving plate. It will be understood that both of the base plate and moving plate should have the same number of slots, in corresponding positions to each other.
  • the thermal actuator becomes excited by the temperature within the oven or water so it undergoes its designed shape change and exerts a force which is orthogonal to the force exerted by the piezo ceramic actuator.
  • This force causes the moving plate (30) to move in the X plane as well as the Y plane. This motion will have the effect of reducing the size of the apertures, as shown in Figure 4, so that only a partial quantity of the available area is now exposed.
  • the actuators have been described here as a piezo ceramic and an hydraulic system, but it should be understood that either the first or second actuator can be any convenient form of actuator such as a voice coil, bimetallic actuator, "wax stat", shape memory alloy, phase change chemical or pressure sensitive device.
  • the input points may also be used to control the flow of low pressure gas through such a system in response to any two inputs not just a user control and a thermal sensor.
  • the same construction may be used to alter the ratio of two gases passing through a system, by providing an arrangement of apertures that work in only one of the two planes, as in Figure 6.
  • the X slot may be used to alter the ratio of two gases passing through a system, by providing an arrangement of apertures that work in only one of the two planes, as in Figure 6.
  • the Y slot (70) behaves in the opposite manner.
  • Figures 1 to 6 show a system based upon two planar surfaces as the interaction.
  • the two motions can be created via the use of a cylindrical assembly (75) in which one motion (80) is axial and the second motion (90) is rotary, shown as Figure 7.
  • a key issue in the embodiments is the amount of force required to overcome seals and other challenges such as leakage.
  • Any convenient system for sealing an interface may be used that offers low friction. It is a preferred embodiment to make use of magnetic couplings through a gas tight non magnetic surface such as plastic or non ferrous metal.
  • the actuator has a magnet suitably constructed as does the plate or rotating part such that movement of the actuator forces corresponding movement of the part within the valve.
  • the bearings for such a device may be conveniently sealed using ferrofluidics to reduce the frictional forces.
  • the moving plate may conveniently be formed from a smooth flexible material such as PTFE tape or an injection moulding in which the material is sufficiently thin to form a deformable film. If the film is deformable and the gas pressure comes from above, the pressure differential will improve the seal thus reducing the requirement for highly machined surfaces.
  • the material used to form the film can be any sufficiently smooth and flexible material which will provide a gas-seal, but fl ⁇ ropolymers such as polytetrafluoroethylene (PTFE) or polytetrafluorochlore ethylene (PTFCE) are preferred for their durability and low frictional co-efficients.
  • the piezo actuator may assume a rest position that does not permit full sealing, or one or more apertures may be shaped to maintain the pilot flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

L'invention concerne un régulateur de débit de fluide, qui est sensible à au moins deux états conditionnels se présentant sous la forme d'entrées.
PCT/GB2001/001660 2000-04-11 2001-04-11 Vanne basse pression WO2001077555A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46725/01A AU4672501A (en) 2000-04-11 2001-04-11 Low pressure valve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0008935.9 2000-04-11
GB0008935A GB0008935D0 (en) 2000-04-11 2000-04-11 Low pressure fluid regulator

Publications (1)

Publication Number Publication Date
WO2001077555A1 true WO2001077555A1 (fr) 2001-10-18

Family

ID=9889711

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/001660 WO2001077555A1 (fr) 2000-04-11 2001-04-11 Vanne basse pression

Country Status (3)

Country Link
AU (1) AU4672501A (fr)
GB (1) GB0008935D0 (fr)
WO (1) WO2001077555A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1625317A2 (fr) * 2003-04-28 2006-02-15 Alfmeier Präzision Ag Baugruppen und Systemlösungen Ensemble de regulation d'ecoulement comprenant des actionneurs en alliage formes a memoire de forme
EP1970607A1 (fr) * 2007-03-16 2008-09-17 Rolls-Royce plc Agencement de refroidissement
EP2065778A1 (fr) * 2007-11-05 2009-06-03 Sundsvall Energi AB Procédé pour concevoir une soupape de contrôle de flux et soupape de contrôle de flux
EP2462367A4 (fr) * 2009-08-07 2017-09-20 Autoliv ASP, Inc. Soupape de décharge

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140484A1 (de) * 1971-08-12 1973-02-22 Langen & Co Wegeventil
US3957081A (en) * 1974-01-16 1976-05-18 Etablissements P. Piel Societe Anonyme Modifier
US4284103A (en) * 1978-05-08 1981-08-18 Pemberton J C Random access valve
US5275195A (en) * 1991-12-09 1994-01-04 Silvano Breda Valve cartridge and seal therefor
EP0810398A2 (fr) * 1996-05-30 1997-12-03 Nass Magnet GmbH Robinets-vannes électriques
US5895028A (en) * 1997-09-23 1999-04-20 Uop Llc Single disc slide valve with center biased flow
WO1999035428A1 (fr) * 1998-01-08 1999-07-15 Fondse Valves B.V. Clapet multidirectionnel
WO1999062088A1 (fr) 1998-05-27 1999-12-02 Pbt (Ip) Limited Dispositifs piezoelectriques
WO1999061827A1 (fr) 1998-05-27 1999-12-02 Pbt (Ip) Limited Vanne a commande electrique

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140484A1 (de) * 1971-08-12 1973-02-22 Langen & Co Wegeventil
US3957081A (en) * 1974-01-16 1976-05-18 Etablissements P. Piel Societe Anonyme Modifier
US4284103A (en) * 1978-05-08 1981-08-18 Pemberton J C Random access valve
US5275195A (en) * 1991-12-09 1994-01-04 Silvano Breda Valve cartridge and seal therefor
EP0810398A2 (fr) * 1996-05-30 1997-12-03 Nass Magnet GmbH Robinets-vannes électriques
US5895028A (en) * 1997-09-23 1999-04-20 Uop Llc Single disc slide valve with center biased flow
WO1999035428A1 (fr) * 1998-01-08 1999-07-15 Fondse Valves B.V. Clapet multidirectionnel
WO1999062088A1 (fr) 1998-05-27 1999-12-02 Pbt (Ip) Limited Dispositifs piezoelectriques
WO1999061827A1 (fr) 1998-05-27 1999-12-02 Pbt (Ip) Limited Vanne a commande electrique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1625317A2 (fr) * 2003-04-28 2006-02-15 Alfmeier Präzision Ag Baugruppen und Systemlösungen Ensemble de regulation d'ecoulement comprenant des actionneurs en alliage formes a memoire de forme
EP1625317A4 (fr) * 2003-04-28 2006-08-02 Alfmeier Praez Ag Ensemble de regulation d'ecoulement comprenant des actionneurs en alliage formes a memoire de forme
EP1970607A1 (fr) * 2007-03-16 2008-09-17 Rolls-Royce plc Agencement de refroidissement
US8561924B2 (en) 2007-03-16 2013-10-22 Rolls-Royce Plc Cooling arrangement
EP2065778A1 (fr) * 2007-11-05 2009-06-03 Sundsvall Energi AB Procédé pour concevoir une soupape de contrôle de flux et soupape de contrôle de flux
EP2462367A4 (fr) * 2009-08-07 2017-09-20 Autoliv ASP, Inc. Soupape de décharge

Also Published As

Publication number Publication date
GB0008935D0 (en) 2000-05-31
AU4672501A (en) 2001-10-23

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