GB2540356A - Two way pressure relief vent - Google Patents
Two way pressure relief vent Download PDFInfo
- Publication number
- GB2540356A GB2540356A GB1512188.2A GB201512188A GB2540356A GB 2540356 A GB2540356 A GB 2540356A GB 201512188 A GB201512188 A GB 201512188A GB 2540356 A GB2540356 A GB 2540356A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vent
- blade
- pressure relief
- blades
- pivot
- 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- Withdrawn
Links
Classifications
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- 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/70—Drying or keeping dry, e.g. by air vents
- E04B1/7069—Drying or keeping dry, e.g. by air vents by ventilating
- E04B1/7076—Air vents for walls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/94—Protection against other undesired influences or dangers against fire
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2007—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member specially adapted operating means therefor
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- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2021—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member with a plurality of valve members
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- 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
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- 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
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
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- 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
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
- F16K17/19—Equalising valves predominantly for tanks
- F16K17/196—Equalising valves predominantly for tanks spring-loaded
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- 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
- F24F13/1486—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 bearings, pivots or hinges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide
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- 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
- F24F11/0001—Control or safety arrangements for ventilation
-
- 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
- F24F11/35—Responding to malfunctions or emergencies to fire, excessive heat or smoke by closing air passages
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Architecture (AREA)
- Health & Medical Sciences (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Public Health (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Electromagnetism (AREA)
- Air-Flow Control Members (AREA)
Abstract
A pressure relief vent 2 comprising at least one vent blade 6 rotatably mounted in a vent housing 4 about first and second spaced apart pivot axes 8, 14 located on a pivot mechanism 10, the vent including a spring 18 attached to the pivot mechanism to urge the blade towards a first position in which the blade cooperates with the housing and any adjacent blades to close the vent (see Figs. 1, 4), the blade rotatable in the same rotational direction about each respective pivot axis to second and third positions in which the vent is open (see Figs. 2, 3, 5), in response to a negative or positive differential air pressure across the vent. Each blade may have a weight in the form of solid steel bar (39, Fig. 4) located at the top edge (when closed) to aid rotation against the spring. A pivot pin 8 mounted on each blade may be moveable along an accurate guide slot in the housing as the blade pivots about the other pivot axis 14. Blades may overlap to prevent flame propagation when closed.
Description
Two Wav 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 which results in a drop in pressure of the room relative to the exterior of the room. It is known to provide a double action two way pressure relief vent in a wail or ceiling of a room which automatically opens from the differential pressure acting on its louver blades to allow equalisation of the pressure in the room with the surroundings. The gas subsequently heats up any overpressure that may be caused by the gas expansion is avoided by virtue of the double action vents louver blades opening from the differential pressure from the opposite direction.
Such pressure relief vents have the advantage that they can open to a position that allows gas flow in both directions. However, such pressure relief vents rely on a counter weight system to return the blades to the closed position for the blade rotation about the bottom pivot point for typically positive pressure relief and this restricts the free vent area typically to 30% to 60%. This also increases the weight of the unit so much so that it becomes impractical to make vents larger than a duct size of 500 x 500mm. However, there is a requirement for vents with a duct size up to 1000mm x 1000mm. This type of vent also typically requires a pressure acting on it of 140 to 190 Pascals to be fully open in both directions where there is a requirement for it to be fully open in both directions with a pressure of at least 100 Pascals acting on it. Also this arrangement does not allow for a top counterweight to be fixed to the top of the blade to lower the opening pressure of the blades when rotating about the top pivot point. There is also a requirement for the blades to be able to produce 100% of the potential free vent area in both directions. However, this is impractical with the current counterweight system. The counterweight system in this type of pressure relief vent also requires the blades to be mechanically linked together. This can cause the blades to bounce when pressure is applied to them and they are in the open position, This blade linking also means that in order for pressure relief to occur there needs to be enough pressure and flow acting on all of the blades to overcome the opening pressure required to open them whereas if the blades open independently pressure relief can occur when the pressure is substantial enough to open only one blade.
Accordingly, the present invention seeks to provide a pressure relief vent which can provide pressure relief to an enclosure in both positive and negative pressure relief at substantially 100% of its potential free vent area at pressure of about 100 Pa or below. A pressure relief vent without these drawbacks comprises a vent housing with one or more pairs of vent blades pivotally mounted in the vent housing. Each vent blade is pivotable in both rotational senses on a pivot by a respective differential air pressure across the vent aperture from a first position at which position the vent blades cooperate to close the vent aperture to a second position at which position the vent aperture is open. For the blade action about the lower pivot a spring is used to return the blade to the closed position after the pressure differential has subsided.
This provides a pressure relief vent able to allow pressure relief in two directions (i.e. to allow gas flow into and out of a room) which can provide maximises available free vent area at pressure of 100 Pa in both directions.
Accordingly, in its broadest sense, the present invention provides a pressure relief vent comprising a vent housing defining an aperture, at least one vent blade mounted in the vent housing so as to be pivotable in the same rotational sense about each of a first and a second, spaced-apart pivot axes, by a respective differential air pressure across the vent aperture, from a first position, at which position the vent blade cooperates with the vent housing and/or any adjacent vent blade to close the vent aperture, towards a second and a third position, respectively, at which positions the vent aperture is open and in which each vent blade returns to the first position when there is no differential air pressure across the vent aperture.
The vent of the present invention is characterised in that it includes a closing means for urging each vent blade towards the first position when rotating about the lower pivot point by the attachment of a spring to the pivot mechanism so as to provide that the vent blades return to the closed position when there is no differential pressure across the vent.
There is preferably included a top weight on the vent blades in order aid the low pressure opening of the blades when rotating about the top pivot point.
Because each vent blade rotates to open the pressure relief vent in the same rotational sense whatever side of the vent is exposed to the higher pressure, the seals between each vent blade and the adjacent vent blade or vent housing can be designed with fewer constraints as the seal is, in each case, broken by the same relative movement. This is in contrast to the prior known arrangements where the seals must be designed to be broken in two oppositely directed relative movements.
In a preferred embodiment, a first end of each vent blade has a pivot means mounted in, and movable along, an arcuate guide means an end of which acts a stop when the vent blade is in the first position and an opposite second end which rests against a stop means when the vent blade is in the first position. When a differential air pressure applied to the vent urges the vent blade in a direction which pushes the second end of the vent blade against the stop, the first end of the vent blade moves as the pivot means moves along the arcuate guide so opening the vent, the vent blade rotating about the stop which defines a pivot axis. When a differential pressure is applied to the vent in the opposite direction, the first end of the vent blade is maintained in place as the pivot means is at the end of the arcuate guide while the second end is pushed away from the stop so, again, opening the vent.
Considering a vent with a pair of such vent blades, the ends of the adjacent blades can be fully interlinked, in an overlapping manner, as the overlap is broken by the same relative movement whatever the differential pressure: either the upper end of the lower vent blade rotates away from the lower end of the upper vent blade or the lower upper end of the lower vent blade end of the upper vent blade rotates away from the upper end of the lower vent blade.
The pivot means may be rotatably mounted in a carrier plate which, in turn, is pivotably mounted on the stop.
Generally, embodiments of pressure relief vent according to the present invention will have at least one vent blades and adjacent vent blades interlink when in the first position.
The vent blades are not needed to be interconnected so that they are constrained to pivot together.
Preferably the adjacent vent blades interlink when in the first position to form a continuous barrier, conveniently by means of a male/female arrangement. A particular application of a two-way vent is for the pressure relief of an enclosure where a halocarbon gas suppression system has been installed. Studies and directives indicate that the negative pressure to be relieved for such an enclosure is greater; by a factor of about four in some cases, than the positive pressure to be relieved. However in order to protect against incorrect installation if the vent is put in the wrong way round it is preferable to provide a vent that can produce substantially the same free vent area in both directions.
The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a schematic isometric view of an embodiment of a pressure relief vent according to the present invention;
Figures 2 is a side view and Figures 3,4 and 5 are schematic cross-sectional end views of the vent of Figure 1 in the closed position and after the vent is opened by airflow from the left and right side, respectively.
Referring to Figures 1 and 3, a pressure relief vent 2 has a 1.5mm steel housing 4 into which fit a series of 1.0mm double sheet steel vent blades 6 which are fixed to a pair of 10mm diameter steel pivot pins 8 and which are free to rotate inside the top of a carrier bracket 10 which is made from 2.0mm steel with a series of holes onto which springs 18 can be attached. The carrier brackets 10 are each attached to a bearing via an MIO cap head bolt 12 and can rotate about a respective pivot 14.
The shouldered bearing about which each carrier arm 10 rotates sits in a sheet metal plate which is attached to the vent housing 4 by 3 x M5 Clynch studs 16. The head of each MIO cap head bolt 12 extends into the housing aperture and acts as a stop for the bottom of each vent blade 6 about which they rotate where there is a positive on to the right hand hole as shown in Figure 3. A 10mm diameter spring 18 made of 1.0mm steel wire acts to balance the weight of the vent blade assembly 6 and carrier bracket 10 so as to keep this assembly upright when no air pressure is acting on it and no pressure relief is required in direction N of Figure 3. Different strength springs 18 can be fitted and attached at various points on carrier arm 10 to adjust the pressure at which the vent will open in the "positive" direction of Figure 3. Slots 20 allow pivot pins 8 free movement along the slots 20 whilst the vent blades 6 are moved open for the "positive" pressure relief up to the extent of the slot. In this embodiment the slot is of a length which allows the "positive" pressure relief to approximately 100% free vent area. These slots 20 also stop the vent blades 6 from falling forwards.
Referring now to Figure 4, the vent unit 2 is shown in cross section with the vent blades 6 in the closed position. The double skinned blade design of the vent blades can be seen. A top skin 30 is of 1.0mm sheet steel is attached to central chassis bar 32 which is a "IT section of 1.5mm steel which holds it apart from a top skin 34 by 10mm. The top blade skin 30 has a 15mm radius curve at one end. Bottom blade skin 34 has a 90° fold at the top and bottom. The top fold of bottom blade skin 34 has a 10mm x 10mm solid steel bar 39 attached to it which acts to help the rotation of the blade assembly 6 as it is rotated about pivot point 8 when negative pressure N is acting on it. 15mm radius curve on the bottom of top blade skin 30 cross over weight bar 39 on blade bottom blade skin 34 in a fully overlapping manner when the vent blades are in the closed position of Figure 2 to stop flames from passing through the vent in the event of a fire. 'L' sections 36 act as a fire stop at the top and bottom of the casing when engaged with the adjacent vent blade 6. A 10mm diameter steel pivot pin 38 which has half of its diameter machined away to form a flat which sits on the blade section and which is riveted to each vent blade 6. This offsets the weight of each blade assembly from carrier arm pivot point 12 and helps to keep the carrier arm upright when in 'Negative' pressure relief mode as shown in Figure 3 and the blade in the upright, closed position. This offset pivot also helps to keep more mass of each vent blade 6 over pivot point 12 when in 'Positive' pressure relief mode so as reducing the amount of counter weight required to return the blades to the upright position when the 'positive' pressure has subsided. See Figure 3.
Referring now to Figure 5, vent blades 6 are shown rotated about pivots 38 from pressure of air in first, negative direction from direction M. In this direction each blade 6 is free to open to 90° from upright giving the vents maximum free vent area which taking the 15mm profile of each blade into account will equate to 85% free vent area. The spring 18 and air pressure keep the carrier arm 10 upright. The air flow acting on the curve on the lower {right hand end as shown) of the blade 6 makes most efficient use of its force by being at the furthest point from pivot point 38 and therefore helps to effect the free vent area provided at low air flow and pressure. The weight bar 39 acts about pivot 38 to help lift the larger proportion of blade assembly 6 so as to allow the blade assembly 6 to reach a position 90° from upright allowing full pressure relief at lower air pressures. In the closed position the curved end of the top blade skin 30 interlink and cross over weight bar 39 to act as a flame barrier in the event of a fire.
Referring now to Figure 3 louver blades 6 and carrier arm 10 are shown rotated about pivot point 12 under pressure from air movement in a second direction P. In this example the vent blades 6 are limited to 90° angle of rotation by the arcuate guide 20 which by forming a gap of approximately 85mm at points G gives a 85% free vent .......area.
Referring to Figure 2, the vent blades 6 are being acted on by air flow in the direction N and spring 18 acts upon carrier arm 10 which is fixed to pivot points 14. The tension produced by spring 18 about the pivot 14 acts to close the vent blades 6 when the pressure acting on them subsides.
The illustrated configuration is intended to allow 85% venting relative to the duct size in one direction and up to 85% in the opposite direction. This design is far simpler than a two way vent where the blades need to be interlinked and counter weights are used for the negative blade return action and performance testing also confirms that this new invention performs far better with low pressures. It is common to have to keep a room pressure under 250 Pascals during a gas suppression discharge and the blade design that is used in this invention has been proven to perform to 100% of its available free vent area at pressures as low as 100 Pascals. This is due to the ability to counter weight the blades for the negative pressure relief action and that the spring and its orientation is far better suited to allow the blade to fully open for the negative pressure relief at low pressure whilst firmly returning the blades to the upright closed position when the pressure subsides. Previous counter weight systems for the positive pressure relief required a series of weights that acted on the blades in stages and in practice were found to not allow the blades to fully open at 100 Pa requiring more like 189 Pa to do this whilst guaranteeing the blades to shut once the pressure subsided. The addition of any weight bars to help improve the performance of the negative pressure relief were not suitable because they required even more weight to be added to the mechanism that operated the positive pressure relief making that perform even worse. This unique double pivoting spring assisted design allows for the ideal combination of mechanical combination of a counter weight and spring action that best utilize the maximum effect of the air flow over the blades to achieve higher free vent areas at low pressures.
Claims (8)
1. A pressure relief vent comprising; a vent housing defining an aperture; at least one vent blade mounted in the vent housing so as to be rotatable in the same rotational sense about each of a first and a second, spaced-apart pivot axes, by a respective differential air pressure across the vent aperture, from a first position, at which position the vent blade co-operates with the vent housing and/or any adjacent vent blade to close the vent aperture, towards a second and a third position, respectively, at which positions the vent aperture is open; and in which each vent blade is arranged to return to the first position when there is no differential air pressure across the vent aperture; wherein the vent includes a closing means for urging each vent blade towards the first position when rotating about the lower pivot point wherein the closing means comprises a spring attached to the pivot mechanism so as to return the vent blades to the closed position when there is no differential pressure across the vent.
2 A pressure relief vent as claimed in claim 1 further comprising a weight formed on or mounted to each vent blade in order aid the low pressure opening of the blades when rotating about the top pivot point.
3 A pressure relief vent as claimed in claim 2 wherein the top weight is an elongate element associated with an operatively upper edge of the vent blade.
4. A pressure relief vent as claimed in any one of claims 1 to 3 wherein a first end of each vent blade has a pivot means mounted in, and movable along, an arcuate guide means an end of which acts a stop when the vent blade is in the first position and an opposite second end which rests against a stop means when the vent blade is in the first position.
5. A pressure relief vent as claimed in any preceding claim, in which there are at least two vent blades and adjacent vent blades interlink when in the first position.
6. A pressure relief vent as claimed in any preceding claim, and including closing means for urging each vent blade towards the first position from the second and third positions.
7. A pressure relief vent as claimed in any preceding claim, in which the vent blades are interconnected so that they pivot together.
8. A pressure relief vent substantially as hereinbefore described with reference to, and/or as show in, the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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GB1512188.2A GB2540356A (en) | 2015-07-13 | 2015-07-13 | Two way pressure relief vent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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GB1512188.2A GB2540356A (en) | 2015-07-13 | 2015-07-13 | Two way pressure relief vent |
Publications (2)
Publication Number | Publication Date |
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GB201512188D0 GB201512188D0 (en) | 2015-08-19 |
GB2540356A true GB2540356A (en) | 2017-01-18 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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GB1512188.2A Withdrawn GB2540356A (en) | 2015-07-13 | 2015-07-13 | Two way pressure relief vent |
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GB (1) | GB2540356A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108374520A (en) * | 2018-05-11 | 2018-08-07 | 桐城市永锦建筑工程有限公司 | A kind of fire preventing steel structure column |
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 |
TWI678470B (en) * | 2018-10-10 | 2019-12-01 | 緯創資通股份有限公司 | Fan device and electronic apparatus with anti-backflow function |
EP3726156A1 (en) * | 2019-04-18 | 2020-10-21 | Titon Hardware Limited | Ventilation device |
CN113757393A (en) * | 2020-06-03 | 2021-12-07 | 约克广州空调冷冻设备有限公司 | Protective valve |
EP4071423A1 (en) * | 2021-04-07 | 2022-10-12 | VG Innovations S.à r.l. | Blast damper |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109334403A (en) * | 2018-11-22 | 2019-02-15 | 合肥长安汽车有限公司 | A kind of band hides the air outlet structure of blade |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000204858A (en) * | 1999-01-12 | 2000-07-25 | Takenaka Komuten Co Ltd | Entrance unit with ventilating function |
GB2424061A (en) * | 2005-03-07 | 2006-09-13 | John Richard Coxon | A ventilation device |
GB2443841A (en) * | 2006-11-17 | 2008-05-21 | Chis Coxon | Pressure relief vent |
GB2478581A (en) * | 2010-03-11 | 2011-09-14 | Christopher Coxon | Pressure relief vent |
-
2015
- 2015-07-13 GB GB1512188.2A patent/GB2540356A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000204858A (en) * | 1999-01-12 | 2000-07-25 | Takenaka Komuten Co Ltd | Entrance unit with ventilating function |
GB2424061A (en) * | 2005-03-07 | 2006-09-13 | John Richard Coxon | A ventilation device |
GB2443841A (en) * | 2006-11-17 | 2008-05-21 | Chis Coxon | Pressure relief vent |
GB2478581A (en) * | 2010-03-11 | 2011-09-14 | Christopher Coxon | Pressure relief vent |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
CN108374520A (en) * | 2018-05-11 | 2018-08-07 | 桐城市永锦建筑工程有限公司 | A kind of fire preventing steel structure column |
CN108374520B (en) * | 2018-05-11 | 2020-09-04 | 桐城市永锦建筑工程有限公司 | Fireproof steel structure column |
TWI678470B (en) * | 2018-10-10 | 2019-12-01 | 緯創資通股份有限公司 | Fan device and electronic apparatus with anti-backflow function |
US10852029B2 (en) | 2018-10-10 | 2020-12-01 | Wistron Corporation | Window-shades mechanism with an anti-backflow function, related fan device and electronic apparatus |
EP3726156A1 (en) * | 2019-04-18 | 2020-10-21 | Titon Hardware Limited | Ventilation device |
CN113757393A (en) * | 2020-06-03 | 2021-12-07 | 约克广州空调冷冻设备有限公司 | Protective valve |
CN113757393B (en) * | 2020-06-03 | 2023-10-10 | 约克广州空调冷冻设备有限公司 | Protective valve |
EP4071423A1 (en) * | 2021-04-07 | 2022-10-12 | VG Innovations S.à r.l. | Blast damper |
Also Published As
Publication number | Publication date |
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GB201512188D0 (en) | 2015-08-19 |
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Legal Events
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WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |