EP0430720A2 - Clapet d'aération - Google Patents

Clapet d'aération Download PDF

Info

Publication number
EP0430720A2
EP0430720A2 EP90313118A EP90313118A EP0430720A2 EP 0430720 A2 EP0430720 A2 EP 0430720A2 EP 90313118 A EP90313118 A EP 90313118A EP 90313118 A EP90313118 A EP 90313118A EP 0430720 A2 EP0430720 A2 EP 0430720A2
Authority
EP
European Patent Office
Prior art keywords
flap
springs
ventilator
opening
open
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.)
Granted
Application number
EP90313118A
Other languages
German (de)
English (en)
Other versions
EP0430720B1 (fr
EP0430720A3 (en
Inventor
David Richard Pothecary
Trevor Leonard Cawte
David Hinks
Terrence Raymond Warnes
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.)
Colt International Ltd
Original Assignee
Colt International 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 Colt International Ltd filed Critical Colt International Ltd
Publication of EP0430720A2 publication Critical patent/EP0430720A2/fr
Publication of EP0430720A3 publication Critical patent/EP0430720A3/en
Application granted granted Critical
Publication of EP0430720B1 publication Critical patent/EP0430720B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/146—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with springs

Definitions

  • the present invention comprises improvements relating to ventilators and concerns controllable ventilators comprising an outwardly opening hinged flap which when closed covers over and closes or assists in closing a ventilation opening of the ventilator.
  • Such ventilators are often used as fire ventilators and, to ensure a failsafe operation, are provided with a flap opening spring or springs.
  • a flap opening spring or springs For normal day-to-day ventilation the flap is opened by its spring and closed against the action of its opening spring by means of a fluid pressure operable piston and cylinder unit or an electric motor, for example.
  • the opening spring is required to open the flap in all circumstances it is usual to make proper allowance for the weight of the flap, any snow load on the flap and the frictional forces of the mechanism which need to be overcome when moving the flap from its closed, e.g. horizontal, position to its open, e.g. vertical, position, when choosing the power of the opening spring.
  • the horizontal closed and vertical open position of the flap are chosen to represent the worst example concerning the opening force requirements for the flap and that the ventilator might well be mounted at some inclined angle or even vertically in practice instead of horizontal.
  • an equal and opposite power is, in general, required to be exerted on the flap to move the flap from its, e.g. vertical open position to its horizontal closed position ignoring the self weight of the flap.
  • the closing force determines the stress regime to which the ventilator frame is subjected during the closing of the flap and any reduction of this stress is of benefit to the design and functioning of the ventilator as a whole.
  • the opening torque characteristic due to the force exerted by the opening spring must start above this curve e. If the opening spring is to be in the form of a linearly extendable strut housed generally within the depth of the ventilator frame, however, then as may be seen from Fig. 2 the effective radius of action about the flap hinge axis at which the spring operates on the flap increases from b to e as the flap is moved from its closed to its open position.
  • the opening torque characteristic thus rises with the opening angle ⁇ , generally as indicated at g in Fig. 3 and the torque required to close the flap, taking into account the assistance of the flap self weight, is indicated at f in Fig. 3.
  • the present invention aims to reduce the maximum closing torque requirement in a sprung-to-open hinged flap ventilator having an opening spring in the form of a linearly extendible strut the effective radius of action of which increases as the flap is moved from its closed to its fully open position.
  • the present invention provides that the strut is composed of a series of springs of different linear spring rates.
  • the ventilator comprises a frame 10 defining a ventilation opening 11 and a single, glazed ventilation flap 13 hinged to the frame and angularly movable about its hinge axis 15 to open and close the ventilator.
  • Mechanism generally indicated at 20 is provided for opening and closing the ventilator and one such menchanism is housed in each longitudinally extending internal side channel 21 of the frame.
  • the mechanisms 20 are identical and one only of them will be described.
  • the mechanism 20 comprises a pneumatic piston and cylinder unit 22 having its cylinder 25 mounted to the frame 10 with its cylinder inner end positioned in the side channel 22 adjacent the flap hinge axis 15 and its cylinder axis 26 extending longitudinally of the side channel 21.
  • Rotatably mounted towards the opposite end of the side channel 21 is an integral pair of drums 30, 31 of different diameter.
  • the smaller diameter drum 31 receives a wound-on end portion of a flat high tensile flexible steel strip 34 connected at its other end to the piston rod 23 of the piston of the piston and cylinder unit 22.
  • the larger diameter drum winds on one end of a wire rope or a further flexible steel strip 36, the other end of which is connected to the flap 13 as at 38.
  • a pair of linearly operable gas springs 40 are fixed together in parallel, side-by-side, so as to overlap their linearly operable extents.
  • the gas springs 40 have their piston rods 42 extending in opposite directions and hingeably connected at their outer ends respectively to the flap 13, as at 43, and the frame 10, as at 44, in this case by means of ball joints 45.
  • a pair of telescoping gas springs one housed within the other, could be used.
  • cylinder guided, coiled wire torsion springs could be substituted.
  • linearly operable gas springs are preferred.
  • the gas springs 40 operate as linearly extendible struts to open the ventilator and the ventilator is closed by fluid pressure supplied to the piston and cylinder units 22.
  • the overall length of the cylinders 25 is dependent upon their stroke length and a fixed dimension for internal seals, piston and end mountings.
  • the overall outstroked length of the piston and cylinder units 22 is at least twice their stroke length.
  • the stroke length of the units 22 is magnified to an extent sufficient to close the ventilator flap whilst positioning the connection points 38 of the flexible connection members 36 at a location close to the connection points 43 of the gas springs 40 and close to the free transverse edge of the flap 13.
  • the gas springs 40 of each pair are pressurised with gas to provide the springs of each pair with different spring rates.
  • the lowest force of the higher pressure spring of the pair is selected to be above the highest force of the lower pressure spring of the pair.
  • the higher pressure spring of the pair outstrokes first to move the flap 13 from its closed to a partly open position indicated at ⁇ 1 in Fig. 4 and then the lower pressure spring of the pair outstrokes to move the flap 13 from is ⁇ 1 position to its ⁇ 2 position is indicated in Fig. 4.
  • the struts formed by the pairs of springs 40 are arranged to extend symmetrically, the springs 40 anchored to the frame 10 being the higher pressure springs and extending first.
  • the torque required to overcome the weight of the flap 13 and open the flap 13 is W cos ⁇ H 2 where W is the weight of the flap 13, H is the length of the flap 13 and ⁇ is the opening angle of the flap 13.
  • W is the weight of the flap 13
  • H is the length of the flap 13
  • ⁇ is the opening angle of the flap 13.
  • ⁇ 2 55°.
  • the curve g in Fig. 4 would commence as shown in Fig. 3 and drop down vertically at the ⁇ 1 angle of opening.
  • the curve g would step down in more than one step but would still remain always above the curve e.
  • connection point at 38 of the other end of the wire rope or steel strip 36 is shifted to a point close to the mid point of the free edge of the flap 13.
  • the wire rope is then led from the larger diameter drum 30 over a pulley on the frame, the axis of rotation of the drums 30, 31 extending at right angles and the drums being drivingly interconnected by means of a pair of bevel gears.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Catching Or Destruction (AREA)
EP90313118A 1989-12-01 1990-12-03 Clapet d'aération Expired - Lifetime EP0430720B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898927216A GB8927216D0 (en) 1989-12-01 1989-12-01 Improvements relating to ventilators
GB8927216 1989-12-01

Publications (3)

Publication Number Publication Date
EP0430720A2 true EP0430720A2 (fr) 1991-06-05
EP0430720A3 EP0430720A3 (en) 1992-09-02
EP0430720B1 EP0430720B1 (fr) 1995-03-22

Family

ID=10667279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90313118A Expired - Lifetime EP0430720B1 (fr) 1989-12-01 1990-12-03 Clapet d'aération

Country Status (4)

Country Link
EP (1) EP0430720B1 (fr)
AT (1) ATE120270T1 (fr)
DE (1) DE69018033D1 (fr)
GB (1) GB8927216D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL422844A1 (pl) * 2017-09-14 2019-03-25 Fakro Pp Spółka Z Ograniczoną Odpowiedzialnością Okno z elementem wspomagającym unoszenie skrzydła

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1423832A (en) * 1972-04-11 1976-02-04 Bloxvich Lock Stamping Telescopic stays
DE2633123A1 (de) * 1976-07-23 1978-02-02 Colt Int Ltd Belueftungsvorrichtung
FR2542360A1 (fr) * 1983-03-11 1984-09-14 Alcaud Sa Dispositif de trappe mobile notamment pour le desenfumage
FR2578017A1 (fr) * 1985-02-27 1986-08-29 Fichtel & Sachs Ind Inc Systeme d'equilibrage a ressort a gaz
EP0314201A2 (fr) * 1986-11-25 1989-05-03 Colt International Limited Clapet d'aération

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1423832A (en) * 1972-04-11 1976-02-04 Bloxvich Lock Stamping Telescopic stays
DE2633123A1 (de) * 1976-07-23 1978-02-02 Colt Int Ltd Belueftungsvorrichtung
FR2542360A1 (fr) * 1983-03-11 1984-09-14 Alcaud Sa Dispositif de trappe mobile notamment pour le desenfumage
FR2578017A1 (fr) * 1985-02-27 1986-08-29 Fichtel & Sachs Ind Inc Systeme d'equilibrage a ressort a gaz
EP0314201A2 (fr) * 1986-11-25 1989-05-03 Colt International Limited Clapet d'aération

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL422844A1 (pl) * 2017-09-14 2019-03-25 Fakro Pp Spółka Z Ograniczoną Odpowiedzialnością Okno z elementem wspomagającym unoszenie skrzydła

Also Published As

Publication number Publication date
DE69018033D1 (de) 1995-04-27
EP0430720B1 (fr) 1995-03-22
EP0430720A3 (en) 1992-09-02
GB8927216D0 (en) 1990-01-31
ATE120270T1 (de) 1995-04-15

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