EP0061469B1 - Isolationsschieber - Google Patents

Isolationsschieber Download PDF

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Publication number
EP0061469B1
EP0061469B1 EP81902621A EP81902621A EP0061469B1 EP 0061469 B1 EP0061469 B1 EP 0061469B1 EP 81902621 A EP81902621 A EP 81902621A EP 81902621 A EP81902621 A EP 81902621A EP 0061469 B1 EP0061469 B1 EP 0061469B1
Authority
EP
European Patent Office
Prior art keywords
damper
blade
damper blade
duct
isolation
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.)
Expired
Application number
EP81902621A
Other languages
English (en)
French (fr)
Other versions
EP0061469A1 (de
EP0061469A4 (de
Inventor
Robert George Stephenson
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.)
James Howden Australia Pty Ltd
Original Assignee
James Howden Australia Pty 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 James Howden Australia Pty Ltd filed Critical James Howden Australia Pty Ltd
Priority to AT81902621T priority Critical patent/ATE19682T1/de
Publication of EP0061469A1 publication Critical patent/EP0061469A1/de
Publication of EP0061469A4 publication Critical patent/EP0061469A4/de
Application granted granted Critical
Publication of EP0061469B1 publication Critical patent/EP0061469B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/06—Construction of valves or dampers for controlling air supply or draught slidable only

Definitions

  • the present invention relates to an isolation damper for gas ducts and more particularly to an isolation damper of the slide type.
  • Isolation dampers are used to close off a gas duct.
  • a valve member of some type in the damper is brought into sealing engagement with the seat of the damper, or some other sealing element, to form a gas tight seal preventing gas leakage past the damper.
  • Conventional dampers are of three types viz., the poppet type wherein a flexible sheet of steel is deformed onto the seat of the damper under system pressure or negative pressure; the slide type in which an inflexible steel plate is slid across the duct and into sealing engagement with sealing means on the damper seat and the butterfly type in which two pivotably connected inflexible plates are folded into or out of sealing engagement with the sealing means on the damper seat.
  • the poppet type valve cannot be conveniently used as an isolation damper intermediate the ends of a gas duct.
  • the slide type suffers from the disadvantages that, firstly, a secondary seal system, which is susceptible to wear, is required to make sealing contact with the slide and, secondly, a housing is required to hold the plate when it has been withdrawn from the duct which is both unsightly and expensive to build.
  • the damper comprises a frame, a gas-impermeable curtain, means for mounting the curtain to one side of the frame, means for drawing the curtain across the frame to a closed position, and means for effecting a seal between the margins of the curtain extending in the direction of movement and the frame in the closed position comprising strips of sheet material extending along the margins, flexible along their length and resiliently flexible across their width, and arranged to be resiliently flexed across their width in the closed position of the curtain to effect the seal.
  • a flexible curtain valve for large gas ducts is described in U.S. Patent Specification 3410311 it comprises a flexible curtain valve for large gas ducts comprising a fixed upper drive roller, a vertically movable lower idle roller, and a downwardly looped flexible curtain running therebetween.
  • the idle roller divides the curtain into a downstream panel portion and an upstream panel portion.
  • the upper edge of the downstream panel is fixed, the downstream panel contacting and being supported by a lateral grid.
  • the curtain passes under and around the idle roller, the upstream panel portion of the curtain extending from the upstream tangential edge of the idle roller to the downstream tangential edge of the drive roller.
  • This "reverse looping" arrangement assures continuous urging both of the idle roller and the downstream curtain panel into a tight seal with the grid.
  • the present invention in contradistinction to the above is directed to a slide type isolation damper which does not have the disadvantages of known slide type dampers while having the advantage of the poppet type valve.
  • an isolation damper for a gas duct comprising a damper blade, a pair of guide members arranged to the guide the damper blade along a path transverse to the gas duct, and means to move the damper blade along the said path between a first position in which the damper blade extends across the duct and a second position in which it is substantially withdrawn from the duct, the damper blade being relatively thin and flexible such that when in the first position under an applied gas pressure, it can elastically deform to enter into sealing engagement with the guide members and in that a plurality of first and second support elements are disposed intermediate the guide members in close juxtaposition with opposite sides respectively of the path of the damper blade, so that the damper blade is supported by said first and second support elements respectively when pressure is applied to the face of the damper blade distal to said first and second support elements respectively, characterised in that the means to move the damper blade are operable to bend it substantially 90° and move it along a planar path outside the gas duct when the blade travels between said first
  • the use of a thin, flexible damper blade allows the blade to be elastically deformed onto the guide members, which constitute the damper seat, without the need for a secondary sealing system.
  • the flexibility of the blade also allows the blade to follow a non-linear path as it is introduced into, and drawn out of, the duct.
  • the blade could, for instance lie in a plane parallel to and slightly above the gas duct and be turned through 90° just before entering the duct. In this way the isolation damper could be made more cheaply and would be less unsightly.
  • the damper blade is preferably formed of a material such as stainless steel and preferably has a thickness of no more than 5 mm., preferably no more than 3 mm. The use of such a thin damper blade facilitates the movement of the blade into and out of the duct as the thin blade can cut through any duct accumulation which occurs in the guide means.
  • the support elements preferably comprise an array of parallel bars or rods, however a grid of such bars or a perforate plate could also be used provided that the flow of gas through the duct is not unduly impeded.
  • the support elements are preferably provided on each side of the damper blade path such that the damper blade will be supported against undue deformation upon the application of a positive pressure to either of its faces.
  • the isolation damper 10 is mounted in a gas duct 11, the gas moving through the duct in the direction of the arrow B of Figure 1.
  • the damper comprises a damper blade 12, a frame 13 surrounding the duct 11 which frame includes a pair of channel shaped side members 14 constituting guide members for the damper blade 12, and drive means 15 to move the damper blade 12 into and out of the duct 11 that is to say into a first position in which the damper blade 12 extends across the duct 11 and a second position in which the damper blade 12 is substantially withdrawn from the duct 11.
  • the damper blade 12 comprises a sheet of stainless steel 3 mm thick which is connected at its end remote from the duct to the drive means 15 as hereinafter described.
  • the blade extends horizontally at the point of its connection to the drive means 15, it then turns through 90° before entering the guide slots 16 defined by the side members 14.
  • the base member 17 includes a longitudinally extending slot 19 in alignment with slots 16 in the side members 14, and into which the lower end of the damper blade 12 slides when the damper is fully closed.
  • a flap 20 is hingedly connected to the underside of the base member 17 and can be opened to release dust which has lodged in the frame.
  • a plurality of first and second support elements or bars 21 extends between the base member 17 and the top member 18 on either side of the path traversed by the damper blade 12.
  • the bars 21 are formed of mild steel or erosion resistant steel and may have an aerodynamically efficient cross sectional shape if desired.
  • the top member 18 may be formed with a removable top cover 22 such that the slot 23 in the top member 18 through which the damper blade 12 is introduced into the frame 13 may be closed when the damper blade 12 is completely removed from the frame 13.
  • the drive means 15 comprises a reversible motor 24 which drives a pair of endless chains 25 about drums 26.
  • the chains are connected to the free end of the damper blade 12. Upon actuation of the motor 24 the damper blade 12 can be moved into or out of the duct 11.
  • damper blade 12 If the damper blade 12 is introduced fully into the duct 11 and a force applied to one side of the blade 12 it will be elastically deformed against the edges of the slots 16, 19 and 23 of the frame 13 and will sealingly engage therewith in view of the relatively thin, flexible, nature of the damper blade 12. As the blade 12 is forced against the edges of the slots it will similarly be forced against the support bars 21 on the side of the slots opposite the direction from which the force is applied to the blade 12. The support bars 21 give to the damper blade 12 the structural integrity lacking due to its flexible nature.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)

Claims (5)

1. Absperrschieber (10) für einen Gaskanal (11), mit einem Schieberblatt (12), einem Paar Führungsteile (14), die des Schieberblatt (12) entlang einer Bahn quer den Gaskanal (11) führen, und einer Einrichtung (15) zum Bewegen des Schieberblattes (12) entlanq dieser Bahn zwischen einer ersten Stellung, in welcher das Schieberblatt (12) quer durch den Kanal (11) verläuft, und einer zweiten Stellung in welcher as im wesentlichen aus dem Kanal (11) zurückgezogen ist, wobei das Schieberblatt (12) relativ dünn und derart biegsam ist, daß es sich in der ersten Stellung unter einem angelegten Gasdruck elastisch verformen kann, um in Dichteingriff mit den Führungsteilen (14) zu treten, und wobei eine Vielzahl von ersten und zweiten Stützelementen (21) zwischen den Führungsteilen (14) in enger Nebeneinanderlage mit den jeweils entgegengesetzten Seiten der Bahn des Schieberblattes (12) angeordnet ist, so daß das Schieberblatt (12) von den ersten und zweiten Stützelementen (21) jeweils abgestützt wird, wenn ein Druck auf die Seite des Schieberblattes (12) angelegt wird, die von den ersten und zweiten Stützelementen (21) jeweils entfernt ist, dadurch gekennzeichnet, daß die Einrichtung (15, 25, 26) zum Bewegen des Schieberblattes (12) betätigbar ist, um es im wesentlichen um 90° abzubiegen und entlang einer ebenen Bahn außerhalb des Gaskanales (11) zu bewegen, wenn sich das Blatt zwischen der ersten und zweiten Stellung bewegt.
2. Absperrschieber nach Anspruch 1, dadurch gekennzeichnet, daß das Schieberblatt (12) aus rostfreiem Stahl hergestellt ist, der eine Dicke von nicht mehr als 5 mm hat.
3. Absperrschieber nach Anspruch 2, dadurch gekennzeichnet, daß das Schieberblatt (12) eine Dicke von nicht mehr als 3 mm hat.
4. Absperrschieber nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stützelemente (21) eine Anordnung von parallelen Stäben oder Stangen aufweisen.
5. Absperrschieber nach Anspruch 4, dadurch gekennzeichnet, daß jeder Stab oder jede Stange eine aerodynamisch wirksame Querschnittsneigung hat.
EP81902621A 1980-09-30 1981-09-29 Isolationsschieber Expired EP0061469B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81902621T ATE19682T1 (de) 1980-09-30 1981-09-29 Isolationsschieber.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU5826/80 1980-09-30
AUPE582680 1980-09-30

Publications (3)

Publication Number Publication Date
EP0061469A1 EP0061469A1 (de) 1982-10-06
EP0061469A4 EP0061469A4 (de) 1983-01-14
EP0061469B1 true EP0061469B1 (de) 1986-05-07

Family

ID=3768739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902621A Expired EP0061469B1 (de) 1980-09-30 1981-09-29 Isolationsschieber

Country Status (5)

Country Link
EP (1) EP0061469B1 (de)
JP (1) JPS57501592A (de)
CA (1) CA1155823A (de)
WO (1) WO1982001234A1 (de)
ZA (1) ZA816395B (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410311A (en) * 1966-04-22 1968-11-12 Universal Oil Prod Co Flexible curtain valve unit
US4204662A (en) * 1979-03-23 1980-05-27 Reynolds Anthony C Valve for controlling the flow of fluids in conduits and the like

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU419187B2 (en) * 1967-08-23 1971-11-25 Thermo-Technical Development Limited Improvements in or relating to isolators forthe gas-tight sectionalisation of flues and ducts
JPS5348225A (en) * 1976-10-14 1978-05-01 Osaka Shinku Kiki Seisakusho Vacuum gate valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410311A (en) * 1966-04-22 1968-11-12 Universal Oil Prod Co Flexible curtain valve unit
US4204662A (en) * 1979-03-23 1980-05-27 Reynolds Anthony C Valve for controlling the flow of fluids in conduits and the like

Also Published As

Publication number Publication date
JPS57501592A (de) 1982-09-02
EP0061469A1 (de) 1982-10-06
ZA816395B (en) 1982-10-27
CA1155823A (en) 1983-10-25
WO1982001234A1 (en) 1982-04-15
EP0061469A4 (de) 1983-01-14

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