WO2010061216A1 - A pressure relief vent - Google Patents

A pressure relief vent Download PDF

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Publication number
WO2010061216A1
WO2010061216A1 PCT/GB2009/051592 GB2009051592W WO2010061216A1 WO 2010061216 A1 WO2010061216 A1 WO 2010061216A1 GB 2009051592 W GB2009051592 W GB 2009051592W WO 2010061216 A1 WO2010061216 A1 WO 2010061216A1
Authority
WO
WIPO (PCT)
Prior art keywords
vent
blades
pressure relief
blade
positions
Prior art date
Application number
PCT/GB2009/051592
Other languages
French (fr)
Inventor
Christopher Coxon
Original Assignee
Christopher Coxon
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 Christopher Coxon filed Critical Christopher Coxon
Publication of WO2010061216A1 publication Critical patent/WO2010061216A1/en

Links

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
    • F24F13/15—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre with parallel simultaneously tiltable lamellae
    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/12—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side weight-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/745—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity the air flow rate increasing with an increase of air-current or wind pressure
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/12—Hinged dampers
    • A62C2/14—Hinged dampers with two or more blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • 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

Definitions

  • One approach to extinguishing a fire in the room of a building is to inject a cooling fire extinguishing gas into the room to cool the seat of the fire and to deprive the source of the fire of oxygen.
  • Such pressure relief vents have the advantage that they can be opened to a position that allows gas flow in both directions through the vent when in its open position.
  • pressure relief vents rely on a control system to cause the motor to open the vent at the appropriate time which not only requires appropriate sensors and back up power supplies in case of mains power cuts but being an active system also has a number of potential failure points.
  • the present invention seeks to provide a pressure relief vent without these drawbacks.
  • the present invention provides a pressure relief vent comprising a vent housing defining an aperture, one or more pairs of vent blades pivotally mounted in the vent housing, the vent blades being interconnected so that they pivot together, the vent blades being pivotable in both rotational senses by a respective differential air pressure across the vent aperture from respective first positions at which positions the vent blades co-operate to close the vent aperture to second respective positions at which positions the vent aperture is open.
  • the present invention provides an entirely passive pressure relief vent able to allow pressure relief in two directions (i.e. to allow gas flow into and out of a room) which, after allowing relief of pressure, will automatically return to a closed position with the vent closed, as required by fire regulations in certain applications of such vents.
  • the vent does not generally have to be hermetically sealed when closed to meet fire regulations.
  • the adjacent vent blades interlink when the vent blades are in the first positions to form a continuous barrier, conveniently by means of a male/female inter-coupling arrangements.
  • the vent housing may include a pair of parallel walls, each vent blade being mounted to the walls by shaft stubs which extend through each wall. Conveniently, adjacent vent blades of two different adjacent pairs of vent blades are interconnected by a pair of interlinked gear wheels to provide co-ordinated movement of the vent blades.
  • biasing arrangement for urging each vent blade towards the first position to provide that the vent blades return to the closed position when there is no differential pressure across the vent.
  • Other passive means may be employed, for example suitably weighted vent blades.
  • a closing means When a closing means is employed it is preferable that it applies a torque acting to urge the vent blade towards the first position which is greater the nearer the vent blade is to the first position.
  • Figure 1 is a schematic isometric view of a pressure relief vent according to the present invention.
  • Figure 2 is a schematic isometric view of the vent of Figure 1 with the end cover plate removed showing the biasing arrangement
  • Figure 3 is a schematic isometric view of the vent of Figures 1 and 2 with the biasing weight removed;
  • Figures 4, 5 and 6 are schematic part cut-away end views of the vent of Figure 1 in the closed position, viewed from the opposite end, with the vent closed and after the vent is opened by airflow from the left and right side, respectively;
  • Figure 7 is an end view of the vent of Figure 1 showing the biasing arrangement acting to restore the blades to the closed position
  • Figure 8 is a schematic end view of a further embodiment of the present invention with a rack/gearwheel interlock
  • Figure 9 is a schematic end view of the top of the vent of Figure 8.
  • Figure 10 is a perspective end view of part of the vent of Figure 8.
  • Figure 1 1 is a schematic end view of the bottom of the vent of Figure 8 showing the arrangement of various components of the vent of Figure 8;
  • Figure 1 2 is a part perspective view of the bottom of the vent of Figure 8.
  • a pressure relief vent 2 has an aperture 4 defined by a vent housing 6 having a pair of opposed vent side walls, 8, 10 a top wall 12 and a bottom wall 14. Pivotally mounted to the side walls 8, 10 are two pairs of vent blades 16A, 16B and 18A, 18B which in Figure 1 are shown in the closed position at which they co-operate to close the vent aperture 4. This need not be an hermetic seal but sufficiently closed to meet applicable fire regulations.
  • vent blades 16A, 16B, 18A, 18B have male/female ends which interlink when the blades are in the closed position of Figure 1 and which are configured to permit rotation of the vent blades in both rotational senses to the open positions as shown in Figures 5 and 6.
  • Vent blades 1 6B and 18A are rotationally interlinked by gearwheels 20 and 22 fixed to vent blades 16B and 18A.
  • Vent blades 1 6A, 16B, 18A and 18B have lever arms 17A, 17B, 19A, 19B, respectively, lever arms 17A and 19A being connected by a linkage 24 and levers arms 17B and 19B being interconnected by linkage 26. This arrangement is replicated at the other side of the vent and in which the same components have the same reference numerals in the drawings.
  • vent blades 16A, 16B, 18A, 1 8B When there is a differential pressure across the vent, lower pressure on the right, the ends of vent blades 16A, 16B, 18A, 1 8B all move to the right in unison due to the interlinkages to allow air flow to the right as shown in Figure 5. If the lower pressure is to the left, the vent blades rotate in the other direction as shown in Figure 6. The amount of rotation will depend on the airflow rate at any given time. As the pressures at either side of the vent equalise, the vent blades 16A, 16B, 18A, 18B will return to the closed position of Figure 4 by virtue of a biasing arrangement that will be described below.
  • vent blades 16A, 16B, 18A and 18B may be provided to ensure coordinated rotation of the vent blades 16A, 16B, 18A and 18B.
  • lever arms 1 7A, 17B, 19A and 19B are connected to the vent blades 16A, 16B, 18A and 18B by means of stubs 21 A, 21 B, 23A and 23B which pass through side plates 25 and 27 of the vent.
  • FIG. 2 and 7 there is shown the biasing arrangement of the vent blades of Figure 1 and which is present at each side of the vent 2.
  • Crossbars 30 and 32 are attached to vent blades 18A and 18B, respectively, each having a pair of pins 36, 38, respectively, which support a weight plate 40 at horizontal edges 42 and 44.
  • the plate 40 is constrained to move vertically to retain the illustrated orientation on the edges 42 and 44.
  • vent blades 16A, 16B, 18A, 18B move away from the closed position, one or other of each of the pairs of pins 36 and 38 will lift the weight plate upwards so providing a downward biasing force urging the vent blades 18A and 18B, and also vents blades 16A and 16B which are interlinked with them, back to the closed position.
  • the dimensions and pivot positions of the vent blades and the biasing arrangements provide that the vent will open when subject to a differential overpressure of about 100Pa.
  • a further embodiment 59 of the present invention which has, at each side of the vent, an alternative arrangement interlinking two pairs of vents blades 5OA, 5OB, 52A and 52B.
  • a gear wheel 54 is fixed to the end of the vent blade 5OB so as to be rotatable with it
  • a gear wheel 56 is fixed to the end of the vent blade 52B so as to be rotatable with it.
  • Further gear wheels 58 and 60 are also fixed to vent blades 5OB and 52B coaxial with the gearwheels 54 and 56.
  • Gearwheels 62 and 64 are attached to vent blades 5OA and 52A, respectively, and which engage gearwheels 58 and 60 so the vent blades pairs 5OA, 5OB, and 52A, 52B are constrained to rotate in opposite senses.
  • the gearwheels 54 and 56 are interconnected by a pair of toothed racks 70 and 72 mounted on a support 74 and held meshed with the gear wheels 54 and 56 by a pair of rollers 76 mounted on a side plate 77 of the vent.
  • the racks 70 and 72 and gear wheels 54 and 56 constrain the two pairs of vent blades 5OA, 5OB and 52 A, 52B to rotate together to move from the illustrated closed position to one in which the vents are pushed to the left or right due to a differential overpressure across the vent.
  • the vent blades 5OA, 5OB, 52A and 52B are biased to their closed positions as in the embodiment of Figures 1 to 7.
  • top and bottom vent blades 5OA and 52B are pivoted at their ends which are inward of the vent's top and bottom sides which has the advantage that a fire barrier can be readily effected at the top and bottom of the vent 59 by means of blades 80 and 82, respectively, and planar strips 84 and 86 and the ends of vent blades 5OA and 52B as will now be described in more detail with reference to Figures 9 to 1 1 .
  • blade 80 is pivotally mounted to the top casing 90 of the vent 59 by a rod 92.
  • a counterweight 94 which acts to urge the blade 80 into the vertical position so that it is urged into contact with the blade 80 of the upper vent blade 50A when the vent is closed.
  • the blade 82 is pivotally mounted to the bottom casing 96 of the vent 59 by a rod 98 which sits in a channel 100 in the bottom casing 82.
  • the blade 82 is urged to adopt a vertical position by virtue of a counterweight 102 in the form of a metal bar attached to the lower end of the blade 82.
  • the weight of the counterweights 94 and 102 are chosen to allow all the vent blades to move to their open positions in either direction when subjected to a pre-designed differential overpressure across the vent 59.
  • the same vent blade biasing arrangement is used as in the first embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Air-Flow Control Members (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)

Abstract

A pressure relief vent (2) comprising a vent housing (6) defining an aperture (4), one or more pairs of vent blades (16, 18) pivotally mounted in the vent housing (6), the vent blades (16, 18) being interconnected so that they pivot together and in which each vent blade (16, 18) is pivotable in both rotation senses by a respective differential air pressure across the vent aperture (4) from a first position at which position the vent blades (16, 18) co-operate to close the vent aperture (4) to a second position at which position the vent aperture (4) is open.

Description

A Pressure Relief Vent
One approach to extinguishing a fire in the room of a building is to inject a cooling fire extinguishing gas into the room to cool the seat of the fire and to deprive the source of the fire of oxygen.
When the gas is first injected into a room, the air contracts due to the cooling effect resulting in a drop in pressure of the room relative to the exterior of the room. It is known to provide a motorized pressure relief vent in a wall or ceiling of a room which is automatically opened to allow equalisation of the pressure in the room with the surroundings. As the gas subsequently heats up any overpressure that may be caused by the gas expansion is avoided by virtue of the open pressure relief vent, which is kept open by the motor that initially opened the vent.
Such pressure relief vents have the advantage that they can be opened to a position that allows gas flow in both directions through the vent when in its open position. However, such pressure relief vents rely on a control system to cause the motor to open the vent at the appropriate time which not only requires appropriate sensors and back up power supplies in case of mains power cuts but being an active system also has a number of potential failure points. The present invention seeks to provide a pressure relief vent without these drawbacks.
Accordingly, the present invention provides a pressure relief vent comprising a vent housing defining an aperture, one or more pairs of vent blades pivotally mounted in the vent housing, the vent blades being interconnected so that they pivot together, the vent blades being pivotable in both rotational senses by a respective differential air pressure across the vent aperture from respective first positions at which positions the vent blades co-operate to close the vent aperture to second respective positions at which positions the vent aperture is open. The present invention provides an entirely passive pressure relief vent able to allow pressure relief in two directions (i.e. to allow gas flow into and out of a room) which, after allowing relief of pressure, will automatically return to a closed position with the vent closed, as required by fire regulations in certain applications of such vents. The vent does not generally have to be hermetically sealed when closed to meet fire regulations.
Preferably the adjacent vent blades interlink when the vent blades are in the first positions to form a continuous barrier, conveniently by means of a male/female inter-coupling arrangements.
The vent housing may include a pair of parallel walls, each vent blade being mounted to the walls by shaft stubs which extend through each wall. Conveniently, adjacent vent blades of two different adjacent pairs of vent blades are interconnected by a pair of interlinked gear wheels to provide co-ordinated movement of the vent blades.
There may be included biasing arrangement for urging each vent blade towards the first position to provide that the vent blades return to the closed position when there is no differential pressure across the vent. Other passive means may be employed, for example suitably weighted vent blades.
When a closing means is employed it is preferable that it applies a torque acting to urge the vent blade towards the first position which is greater the nearer the vent blade is to the first position.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, of which:
Figure 1 is a schematic isometric view of a pressure relief vent according to the present invention;
Figure 2 is a schematic isometric view of the vent of Figure 1 with the end cover plate removed showing the biasing arrangement; Figure 3 is a schematic isometric view of the vent of Figures 1 and 2 with the biasing weight removed;
Figures 4, 5 and 6 are schematic part cut-away end views of the vent of Figure 1 in the closed position, viewed from the opposite end, with the vent closed and after the vent is opened by airflow from the left and right side, respectively;
Figure 7 is an end view of the vent of Figure 1 showing the biasing arrangement acting to restore the blades to the closed position;
Figure 8 is a schematic end view of a further embodiment of the present invention with a rack/gearwheel interlock;
Figure 9 is a schematic end view of the top of the vent of Figure 8;
Figure 10 is a perspective end view of part of the vent of Figure 8;
Figure 1 1 is a schematic end view of the bottom of the vent of Figure 8 showing the arrangement of various components of the vent of Figure 8; and
Figure 1 2 is a part perspective view of the bottom of the vent of Figure 8.
Referring to Figure 1 a pressure relief vent 2 has an aperture 4 defined by a vent housing 6 having a pair of opposed vent side walls, 8, 10 a top wall 12 and a bottom wall 14. Pivotally mounted to the side walls 8, 10 are two pairs of vent blades 16A, 16B and 18A, 18B which in Figure 1 are shown in the closed position at which they co-operate to close the vent aperture 4. This need not be an hermetic seal but sufficiently closed to meet applicable fire regulations.
Referring now to Figure 4, it can be seen that adjacent the vent blades 16A, 16B, 18A, 18B have male/female ends which interlink when the blades are in the closed position of Figure 1 and which are configured to permit rotation of the vent blades in both rotational senses to the open positions as shown in Figures 5 and 6. Vent blades 1 6B and 18A are rotationally interlinked by gearwheels 20 and 22 fixed to vent blades 16B and 18A. Vent blades 1 6A, 16B, 18A and 18B have lever arms 17A, 17B, 19A, 19B, respectively, lever arms 17A and 19A being connected by a linkage 24 and levers arms 17B and 19B being interconnected by linkage 26. This arrangement is replicated at the other side of the vent and in which the same components have the same reference numerals in the drawings.
When there is a differential pressure across the vent, lower pressure on the right, the ends of vent blades 16A, 16B, 18A, 1 8B all move to the right in unison due to the interlinkages to allow air flow to the right as shown in Figure 5. If the lower pressure is to the left, the vent blades rotate in the other direction as shown in Figure 6. The amount of rotation will depend on the airflow rate at any given time. As the pressures at either side of the vent equalise, the vent blades 16A, 16B, 18A, 18B will return to the closed position of Figure 4 by virtue of a biasing arrangement that will be described below.
It will be appreciated different arrangements may be provided to ensure coordinated rotation of the vent blades 16A, 16B, 18A and 18B.
Referring now to Figure 3, there is shown how the lever arms 1 7A, 17B, 19A and 19B are connected to the vent blades 16A, 16B, 18A and 18B by means of stubs 21 A, 21 B, 23A and 23B which pass through side plates 25 and 27 of the vent.
Referring now to Figures 2 and 7, there is shown the biasing arrangement of the vent blades of Figure 1 and which is present at each side of the vent 2. Crossbars 30 and 32 are attached to vent blades 18A and 18B, respectively, each having a pair of pins 36, 38, respectively, which support a weight plate 40 at horizontal edges 42 and 44. The plate 40 is constrained to move vertically to retain the illustrated orientation on the edges 42 and 44. Consequently, as the vent blades 16A, 16B, 18A, 18B move away from the closed position, one or other of each of the pairs of pins 36 and 38 will lift the weight plate upwards so providing a downward biasing force urging the vent blades 18A and 18B, and also vents blades 16A and 16B which are interlinked with them, back to the closed position. In this particular embodiment the dimensions and pivot positions of the vent blades and the biasing arrangements provide that the vent will open when subject to a differential overpressure of about 100Pa.
Referring to Figure 8, a further embodiment 59 of the present invention is shown which has, at each side of the vent, an alternative arrangement interlinking two pairs of vents blades 5OA, 5OB, 52A and 52B. A gear wheel 54 is fixed to the end of the vent blade 5OB so as to be rotatable with it, and a gear wheel 56 is fixed to the end of the vent blade 52B so as to be rotatable with it. Further gear wheels 58 and 60 are also fixed to vent blades 5OB and 52B coaxial with the gearwheels 54 and 56. Gearwheels 62 and 64 are attached to vent blades 5OA and 52A, respectively, and which engage gearwheels 58 and 60 so the vent blades pairs 5OA, 5OB, and 52A, 52B are constrained to rotate in opposite senses.
The gearwheels 54 and 56 are interconnected by a pair of toothed racks 70 and 72 mounted on a support 74 and held meshed with the gear wheels 54 and 56 by a pair of rollers 76 mounted on a side plate 77 of the vent. The racks 70 and 72 and gear wheels 54 and 56 constrain the two pairs of vent blades 5OA, 5OB and 52 A, 52B to rotate together to move from the illustrated closed position to one in which the vents are pushed to the left or right due to a differential overpressure across the vent. The vent blades 5OA, 5OB, 52A and 52B are biased to their closed positions as in the embodiment of Figures 1 to 7.
In the embodiment of Figure 8 the top and bottom vent blades 5OA and 52B are pivoted at their ends which are inward of the vent's top and bottom sides which has the advantage that a fire barrier can be readily effected at the top and bottom of the vent 59 by means of blades 80 and 82, respectively, and planar strips 84 and 86 and the ends of vent blades 5OA and 52B as will now be described in more detail with reference to Figures 9 to 1 1 .
Referring to Figures 9 and 10, blade 80 is pivotally mounted to the top casing 90 of the vent 59 by a rod 92. At each end of the rod 92 and fixed to it is a counterweight 94 which acts to urge the blade 80 into the vertical position so that it is urged into contact with the blade 80 of the upper vent blade 50A when the vent is closed.
Referring to Figures 1 1 and 1 2, the blade 82 is pivotally mounted to the bottom casing 96 of the vent 59 by a rod 98 which sits in a channel 100 in the bottom casing 82. The blade 82 is urged to adopt a vertical position by virtue of a counterweight 102 in the form of a metal bar attached to the lower end of the blade 82. The weight of the counterweights 94 and 102 are chosen to allow all the vent blades to move to their open positions in either direction when subjected to a pre-designed differential overpressure across the vent 59. The same vent blade biasing arrangement is used as in the first embodiment.

Claims

1 . A pressure relief vent comprising; a vent housing defining an aperture; one or more pairs of vent blades pivotally mounted in the vent housing, the vent blades being interconnected so that they pivot together; the vent blades being pivotable in both rotation senses by a respective differential air pressure across the vent aperture from respective first positions at which positions the vent blades co-operate to close the vent aperture to respective second positions at which positions the vent aperture is open.
2. A pressure relief vent as claimed in claim 1 in which adjacent vent blades interlink when in the first position to close the vent aperture.
3. A pressure relief vent as claimed in claim 2 in which the vent housing includes a pair of parallel side walls, each vent blade being mounted to the side walls by shaft stubs which extend through each side wall.
4. A pressure relief vent as claimed in claim 3 in which the adjacent vent blades of two different adjacent pairs of vent blades are interconnected by a pair of interlinked gear wheels so as to rotate together in opposite senses of direction.
5. A pressure relief vent as claimed in claim 4 in which a vent blade of each pair of vent blades are interconnected by a toothed rack which is engaged with a pair of gearwheels fixed to a respective said vent blade of each pair of vent blades so as to be rotatable together
6. A pressure relief vent as claimed in any preceding claim including a biasing arrangement arranged to urge each vent blade towards the first position.
7. A pressure relief vent as claimed in claim 6 in which the biasing arrangement applies a torque acting to urge the vent blades towards the first positions which is greater the nearer the vent blades are to the first positions.
8. A pressure relief vent as claimed in claim 6 or 7 in which the biasing arrangement comprises a crossbeam fixed substantially perpendicularly to the plane of the vent blade from each end of which extends a pin, the pins being arranged in relation to a weight such that a different one of the pins lifts the weight as the vane blade rotates from the first position with a respective sense of rotation.
9. A pressure relief vent as claimed in any preceding claim including a pair of blades pivotably attached to opposite sides of the vent and biased so as to be urged into sealing contact with the movable ends of the adjacent vent blades when the vent blades are in the closed position
PCT/GB2009/051592 2008-11-25 2009-11-24 A pressure relief vent WO2010061216A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0821447.0A GB0821447D0 (en) 2008-11-25 2008-11-25 A pressure relief vent
GB0821447.0 2008-11-25

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Publication Number Publication Date
WO2010061216A1 true WO2010061216A1 (en) 2010-06-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2478581A (en) * 2010-03-11 2011-09-14 Christopher Coxon Pressure relief vent
EP2772700A1 (en) * 2013-03-01 2014-09-03 TROX GmbH Ventilation air guidance grille for arrangement in an air intake and/or in an air outlet of an air conditioning and ventilation system
EP3378538A1 (en) * 2017-03-21 2018-09-26 Hagab Industri AB A pressure regulating unit for regulating pressure resulted from a fire in a room

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543439A (en) * 1968-10-07 1970-12-01 Frederick William Pantland Fire dampers
US3826179A (en) * 1972-10-20 1974-07-30 American Warming Ventilation Differential pressure responsive damper
EP0583156A1 (en) * 1992-08-12 1994-02-16 Kvaerner Masa-Yards Oy Fire closure element
GB2408793A (en) * 2003-12-04 2005-06-08 Richard Gatley Gas vent with linked control members contra-rotating at a predetermined pressure differential
GB2443841A (en) * 2006-11-17 2008-05-21 Chis Coxon Pressure relief vent

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543439A (en) * 1968-10-07 1970-12-01 Frederick William Pantland Fire dampers
US3826179A (en) * 1972-10-20 1974-07-30 American Warming Ventilation Differential pressure responsive damper
EP0583156A1 (en) * 1992-08-12 1994-02-16 Kvaerner Masa-Yards Oy Fire closure element
GB2408793A (en) * 2003-12-04 2005-06-08 Richard Gatley Gas vent with linked control members contra-rotating at a predetermined pressure differential
GB2443841A (en) * 2006-11-17 2008-05-21 Chis Coxon Pressure relief vent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2478581A (en) * 2010-03-11 2011-09-14 Christopher Coxon Pressure relief vent
EP2772700A1 (en) * 2013-03-01 2014-09-03 TROX GmbH Ventilation air guidance grille for arrangement in an air intake and/or in an air outlet of an air conditioning and ventilation system
EP3378538A1 (en) * 2017-03-21 2018-09-26 Hagab Industri AB A pressure regulating unit for regulating pressure resulted from a fire in a room

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Publication number Publication date
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