GB2378233A - A blade for an air flow duct - Google Patents

A blade for an air flow duct Download PDF

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Publication number
GB2378233A
GB2378233A GB0123678A GB0123678A GB2378233A GB 2378233 A GB2378233 A GB 2378233A GB 0123678 A GB0123678 A GB 0123678A GB 0123678 A GB0123678 A GB 0123678A GB 2378233 A GB2378233 A GB 2378233A
Authority
GB
United Kingdom
Prior art keywords
blade
axle
duct
combination
lugs
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Withdrawn
Application number
GB0123678A
Other versions
GB0123678D0 (en
Inventor
Richard Perrin
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.)
Tri Air Innovations Ltd
Original Assignee
Tri Air Innovations 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 Tri Air Innovations Ltd filed Critical Tri Air Innovations Ltd
Publication of GB0123678D0 publication Critical patent/GB0123678D0/en
Publication of GB2378233A publication Critical patent/GB2378233A/en
Withdrawn legal-status Critical Current

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
    • F24F13/1486—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
    • 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
    • F16K1/22—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 crossing the valve member, e.g. butterfly valves
    • F16K1/222—Shaping of the valve member
    • 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
    • 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)
  • Air-Flow Control Members (AREA)

Abstract

A blade 30 comprises a first layer 32 attached to a second layer 34 which has mounting lugs 40 with apertures 44 for mounting the blade 30 to an axle 38. Axle 38 may be free to rotate in the lugs 40 or secured to the blade 30 and extend outside the duct and end in an arm to rotate the blade 30. In this last embodiment, two further lugs 46 are stamped from layer 34 and a pin (50, fig 7) extends through apertures in the lugs 46 and through an aperture in the axle 38 to lock the blade 30 on the axle 38. Axle 38 may be a solid rod or tubular and lugs 40 and 46 may be separate items attached to layer 32. Lugs 46 may be replaced by a pin member (52, fig 8) extending through the axle 38 and into the blade 30.

Description

<Desc/Clms Page number 1>
Air Flow Controller and Fire Damper in an Air Flow Duct The present invention relates to an air flow controller and fire damper in an air flow duct.
Fire dampers in air flow ducts are well known. A commonly used form of damper consists of a flap or blade inside the duct. which is held in an open position, extending along the duct axis. A heavy spring biases the blade to a closed position where it is transverse to the duct axis to block off the duct. A temperature sensitive trigger holds the blade in the open position and releases the blade in the event of a temperature rise caused by fire, such as a flame front moving through the duct.
The seal between the duct wall and the blade relies on the blade edge abutting the duct wall, and so smoke and flame can move past the blade, although soot and other debris eventually help to form a seal. Distortion of the duct wall is a common occurrence and this impairs the seal.
In one commonly used system, the blade is welded to an axle which protrudes through the duct wall to form a handle. Brackets are welded to the blade, and then in turn to the axle. This allows the blade to be rotated by the handle. The welding operation is expensive.
Our co-pending application No. 01100561.9 describes an improved arrangement in which a rim is provided on the duct wall, and the blade closes against the rim. The blade is carried by stub axles which rotate in sockets on the duct inner wall.
<Desc/Clms Page number 2>
Although the stepped shape and dished rim of the blade described in our application No. 01100561. 9 has inherent strength, it could still be subject to some deformation over prolonged use. Also, welding of the stub axles to the blade is time consuming and expensive.
The present invention provides a blade for closing an air flow duct, the blade having an ear or lug for mounting the blade on an axle.
The axle may pass through an aperture provided in a first lug.
In another embodiment, a second lug extends alongside the axle and is attached to the axle.
Very preferably the axle passes through a first lug, and is secured to a second by a pin or bolt.
Preferably two first lugs and/or two second lugs are provided.
Preferably the blade comprises two layers.
By providing a second layer on the blade, one layer can be worked, as to provide the lugs, while the second layer seals any apertures left by the lugs.
One layer may extend outwards to seal the duct, the other layer forming the lugs and laying within the periphery of the former. The use of two layers serves to reinforce the resistance of the blade to deformation, and, unexpectedly, it has also been found to provide an improved thermal break in the duct when under fire test.
<Desc/Clms Page number 3>
Preferably one layer is continuous, extending across the duct width to form the blade proper, and the other layer forms the lugs etc. for attachment to the axle.
Thus another aspect of the invention provides a blade for closing an air flow duct, the blade being formed of two layers of material.
In yet another aspect of the invention, a blade is secured to an axle, so as to rotate with the axle, by a pin member which extends generally diametrically through the axle and then through the blade. The pin member may be a rivet or a bolt, for example. This provides a very quick and cost effective solution for fixing the blade on the axle.
The invention will be further described by way of example with reference to the accompanying drawings, in which: Figure 1 shows schematically in cross-section an arrangement described in our co-pending application No. 0110561.9 ; Figure 2 is a view on arrow A of Figure 1; Figure 3 shows in cross-section a second embodiment of a blade which is particularly suitable for larger size ducts; Figure 4 is a plan view of the blade of Figure 3; Figure 5 is a perspective view of a blade forming an embodiment of the invention; Figure 6 is a cross-section along line VI-VI of Figure 5, and
<Desc/Clms Page number 4>
Figure 7 is a cross-section along line VII-VII of Figure 5.
Figure 8 shows a modification of the embodiment of Figure 5.
Figures 1 and 2 show a duct wall 2 which is circular in cross-section. A continuous circular rim 4 having an inwardly extending flange 6 is riveted to the duct wall 2 at several positions around the rim by sealed rivets (not shown). The rim 4 has a step 8, to form a wall portion 10 which is spaced from the duct wall 2. The rim serves to provide a mounting and a stable mating surface for a blade 12, and also strengthens the duct to maintain the duct shape in the region of the blade 12 to provide improved operation.
The blade 12 is pivotably mounted on the rim 4 and is shown in full outline in its closed position, and in dotted outline in the open position.
As seen in Figure 1, the blade is stepped or joggled at a diameter region 12a so that the halves of the blade 12b, 12c occupy planes to either side of and parallel to the plane of the flange 6, when the blade is in the closed position.
Referring to Figure 2 the blade 12 is mounted on two stub axles 14 which rotate in sockets 16 formed on the rim 4. The stub axles 14 are a good fit in the sockets 16 to reduce any tendency of the blade to wobble, and also to provide a degree of sealing against the passage of smoke when the blade is closed. A single axle extending across the diameter of the blade may be used. The ends of the axle (s) may be sealed.
Heavy duty, i. e. strong, coil springs 18 surround the axles 14, and have one leg 20 bearing on the flange 6, and the other leg 22 bearing on the blade 12 to bias the blade into the closed position, against the flange 6.
<Desc/Clms Page number 5>
The blade 12 is cut away at the edge 12e of the diameter region 12a, near the stub axles 14, to just clear the flange 6.
A cable 24 is attached at one end 26 to the blade region 12b and extends diagonally of the duct to exit through the duct wall 2, for holding the blade in the open position.
The blade 12 is overturned at its outer perimeter to form an axially extending flange 12d and a corner 12f to embrace the rim at the corner 11 formed at the radially outer edge of the flange 6 in portion 12c, and sit snugly at the corner 11 formed between the flange 6 and wall 10 at blade portion 12b. The flange 12d serves to strengthen the blade 12 to retain the shape of the blade during repeated operation and also provides an improved seal, as will be described hereinafter.
In operation, the cable 24 is pulled to rotate the blade 12 into the open position, shown in dotted outline, against the force of the springs 18, and the cable locked. In the event of a fire, the cable 24 is released by a temperature sensitive fuse arrangement, allowing the blade to rotate to the closed position under the force of the springs 18. The overlap of the perimeters of the blade portions 12b, 12c adjacent flange 12d with the flange 6 and particularly the overlap at the corners 11,12f ensure a good seal. The regions 12e, where the blade 12 is cut away may allow a small mount of air or smoke to pass but this will be rapidly blocked by soot etc. , in the event of a fire.
By means of the cable 24, the blade 12 can be held in an intermediate position, thus serving to control the flow of air through the duct during normal operation. Typically, the degree of opening of the blade 12 would be set on installation of the system to balance air flow through the system, and then left.
<Desc/Clms Page number 6>
In the duct 2 the normal air flow is in the flow direction of arrow A. Thus the fixings, such as the rivets holding rim 4 in place and the exit for cable 24, are closed or sealed. This reduces the risk of smoke escaping through the fixings once the blade 12 is closed. It will be appreciated the arrangement could be reversed, with air flowing in the direction of arrow B.
Figures 3 and 4 shows a blade 26 which is a modified form of the blade 12.
The centre portion 26a of the blade is flat. The outer perimeter of the blade is stepped to mate with the flange 6 of Figure 1. At portion 26c the edge of the blade is dished, ending in a circumferential rim 26d forming a corner 26e and the blade 26 is stepped at portion 26b, with circumferential rim 26d forming a corner 26e.
Although a circular cross section duct 2 is shown, other shapes such as square or rectangular are possible, with the blade 12,26 being shaped appropriately.
Figure 5 is a perspective view showing a modification of the blades and stub axle arrangement of Figures 1 to 4, forming an embodiment of the invention.
In Figure 5, the blade or blade 30 is of generally flat shape, similar to that of Figures 3 and 4, but a joggled shape as in Figures 1 and 2 should be used.
The blade 30 comprises a first layer 32 which is substantially continuous and shaped as for the blade of Figures 3 and 4. A second layer 34 is rivetted to the central area 32a of the blade 30 by closed rivets 36. The layers 32,34 are galvanised.
Layer 34 could be attached by welding or gluing, but rivetting provides a particularly cost effective and reliable attachment. Layer 34 serves to
<Desc/Clms Page number 7>
mount the blade on an axle 38 which replaces the stub axles 14 of Figure 1 and 2. Layer 34 is generally square or rectangular, but other shapes could be used. It has up-turned lugs 40 at opposed corners 42, and axle 38 passes through apertures 44 in the lugs 40 to mechanically attached lugs 40 to the axle 38. In one embodiment, axle 38 is free to rotate in the lugs 40.
In another embodiment, it is desired to secure the blade to the axle for rotation therewith. For example, the axle may extend outside of the duct and end in an arm so that the axle can be rotated to rotate the flap. Thus, in this embodiment, in the central region 34a, two further lugs 46 are stamped from the layer 34, (leaving apertures 48, which are covered, by layer 32). A pin 50 extends through apertures 52 in the lugs 46 and an aperture in the axle 38 to mechanically lock the blade 30 on the axle 38. Pin 50 can be in the form of a nut and bolt, a split pin, or the like.
It will be appreciated that in the first embodiment, the blade 30 could rotate freely about the axle 38 (subject to the force of spring 18 (Figure 2) ) and side ways movement of the blade 30 along the axle 36 is limited by the duct wall.
Axle 38 is a solid rod, but a tubular axle could be used, depending on the size and strength required.
Thus layer 34 provides a particularly effective way of mounting the blade 30 on an axle, and at the same time serves to reinforce the layer 32 which serves as the duct closure. The additional layer also provides an enhanced thermal break. Preferably the layer 34 extends over more than about 50% of the area of layer 32, and preferably more than about 70%.
It will be appreciated that lugs 40,46 could be provided as discrete items on the layer 32, attached by rivetting or welding for example. Or they could be stamped from layer 32, any apertures formed by the lugs being covered with a cover plate.
<Desc/Clms Page number 8>
In another modification (not shown), the central lugs 46 are provided by a bracket which is rivetted to the layer 34.
In place of the central lugs 46, for securing the blade 30 to rotate with the axle 38, a pin member 52 may extend through the axle 38 and into the blade 30, as shown in Figure 8. It is preferred to retain the outer lugs 40 for securing the blade 30 on the axle 38, but it will be appreciated that the blade 30 could be pinned to the axle 38 at two or more positions along its length. The pin may be a rivet for example, or more preferably a bolt. A spacer 54 surrounds the pin between the axle 38 and the blade 30. The axle may have a threaded hole to receive the bolt but it is simple to pass the bolt through a smooth bore in the axle.

Claims (18)

  1. CLAIMS: 1. In combination, a blade for an air flow duct and an axle bolt for pivotably mounting the blade in the duct, the blade having a lug which is mechanically attached to the axle for mounting the blade in the duct.
  2. 2. The combination of claim 1, in which the axle passes through an aperture in a first said lug to mount the blade on the axle.
  3. 3. The combination as claimed in claim 2, in which two first lugs are provided.
  4. 4. The combination of claim 1,2 or 3, in which a pin member extends through the axle and the blade to secure the blade for rotation with the axle.
  5. 5. The combination of claim 4, in which the pin member is a bolt.
  6. 6. The combination of claim 1,2 or 3, in which the axle is mechanically fixed to a second said lug so that the blade rotates with the axle.
  7. 7. The combination of claim 6, in which the axle is joined to the second lug by a pin which passes through the second lug and the axle.
  8. 8. The combination of claim 7, in which two second lugs are provided, the pin passing through both second lugs and the axle.
  9. 9. The combination of any one of claims 1 to 8, wherein the blade comprises two layers, one of said layers being worked to provide one or more of the lugs.
    <Desc/Clms Page number 10>
  10. 10. The combination of claim 9, wherein the other of said layers extends, in use, across the duct opening to close the duct.
  11. 11. A blade for an air flow duct, wherein a substantial portion of the blade is formed of two layers of material.
  12. 12. A blade as claimed in claim 11, wherein one of said layers forms a lug for mounting the blade on an axle.
  13. 13. A blade as claimed in claim 11 or 12, wherein a first layer extends across the duct, in use, to close the duct, and the second layer extends over at least 50% of the area of the first layer.
  14. 14. A blade as claimed in claim 13, wherein the second layer extends over at least 70% of the first layer.
  15. 15. In combination, a blade for an air flow duct and an axle for pivotably mounting the blade in a duct, wherein the blade is secured to the axle by a pin member which extends through the axle and the blade.
  16. 16. The combination of claim 15, in which the pin member is a rivet.
  17. 17. The combination of claim 15, in which the pin member is a stud or bolt.
  18. 18. A blade for an air flow duct, substantially as hereinbefore described with reference to Figures 5,6 and 7 of the accompanying drawings.
GB0123678A 2001-07-31 2001-10-02 A blade for an air flow duct Withdrawn GB2378233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0118631.1A GB0118631D0 (en) 2001-07-31 2001-07-31 Air flow controller and fire damper in an air flow duct

Publications (2)

Publication Number Publication Date
GB0123678D0 GB0123678D0 (en) 2001-11-21
GB2378233A true GB2378233A (en) 2003-02-05

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB0118631.1A Ceased GB0118631D0 (en) 2001-07-31 2001-07-31 Air flow controller and fire damper in an air flow duct
GB0123678A Withdrawn GB2378233A (en) 2001-07-31 2001-10-02 A blade for an air flow duct

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB0118631.1A Ceased GB0118631D0 (en) 2001-07-31 2001-07-31 Air flow controller and fire damper in an air flow duct

Country Status (1)

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GB (2) GB0118631D0 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2118536A1 (en) * 2007-02-16 2009-11-18 Woodward Governor Company Tube-end butterfly metering and shutoff valve
EP2715196A1 (en) * 2011-05-27 2014-04-09 Woodward, Inc. Low torque, high flow and tight sealing tube butterfly valve
DE202013100885U1 (en) * 2013-03-01 2014-06-04 Werner Wildeboer Volume flow controller
EP2588781B1 (en) * 2010-06-30 2016-10-19 Valeo Systèmes de Contrôle Moteur Fluid valve
EP2954239A4 (en) * 2013-02-06 2016-10-26 Sitek As Butterfly valve comprising removable coupling part

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343805A (en) * 1963-09-30 1967-09-26 Loewy Eng Co Ltd Disc or butterfly valves
US3669405A (en) * 1970-02-23 1972-06-13 Jansen Gmbh Th Flap valve
GB1289859A (en) * 1969-01-10 1972-09-20
US3963213A (en) * 1973-10-15 1976-06-15 Saab-Scania Aktiebolag Butterfly valve
EP0017583A1 (en) * 1979-04-10 1980-10-15 Omnibrev Holding Ag Precision butterfly valve
GB2103775A (en) * 1981-08-10 1983-02-23 Merchants Warehousing Company Construction of flue damper
US4436281A (en) * 1979-05-23 1984-03-13 Applications Mecaniques Et Robinetterie Industrielle Butterfly valve with an improved obturation device
US5531248A (en) * 1995-01-19 1996-07-02 Eaton Corporation Butterfly valve

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3343805A (en) * 1963-09-30 1967-09-26 Loewy Eng Co Ltd Disc or butterfly valves
GB1289859A (en) * 1969-01-10 1972-09-20
US3669405A (en) * 1970-02-23 1972-06-13 Jansen Gmbh Th Flap valve
US3963213A (en) * 1973-10-15 1976-06-15 Saab-Scania Aktiebolag Butterfly valve
EP0017583A1 (en) * 1979-04-10 1980-10-15 Omnibrev Holding Ag Precision butterfly valve
US4436281A (en) * 1979-05-23 1984-03-13 Applications Mecaniques Et Robinetterie Industrielle Butterfly valve with an improved obturation device
GB2103775A (en) * 1981-08-10 1983-02-23 Merchants Warehousing Company Construction of flue damper
US5531248A (en) * 1995-01-19 1996-07-02 Eaton Corporation Butterfly valve

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2118536A1 (en) * 2007-02-16 2009-11-18 Woodward Governor Company Tube-end butterfly metering and shutoff valve
EP2118536A4 (en) * 2007-02-16 2011-03-30 Woodward Governor Co Tube-end butterfly metering and shutoff valve
EP2588781B1 (en) * 2010-06-30 2016-10-19 Valeo Systèmes de Contrôle Moteur Fluid valve
EP2715196A1 (en) * 2011-05-27 2014-04-09 Woodward, Inc. Low torque, high flow and tight sealing tube butterfly valve
EP2715196A4 (en) * 2011-05-27 2015-03-11 Woodward Inc Low torque, high flow and tight sealing tube butterfly valve
US9027907B2 (en) 2011-05-27 2015-05-12 Woodward, Inc. Low torque, high flow and tight sealing tube butterfly valve
EP2954239A4 (en) * 2013-02-06 2016-10-26 Sitek As Butterfly valve comprising removable coupling part
DE202013100885U1 (en) * 2013-03-01 2014-06-04 Werner Wildeboer Volume flow controller
EP2784406B1 (en) * 2013-03-01 2020-09-30 Wildeboer, Werner Volume flow regulator

Also Published As

Publication number Publication date
GB0123678D0 (en) 2001-11-21
GB0118631D0 (en) 2001-09-19

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