EP1460352A1 - Air flow controller and fire damper in an air flow duct - Google Patents
Air flow controller and fire damper in an air flow duct Download PDFInfo
- Publication number
- EP1460352A1 EP1460352A1 EP04251469A EP04251469A EP1460352A1 EP 1460352 A1 EP1460352 A1 EP 1460352A1 EP 04251469 A EP04251469 A EP 04251469A EP 04251469 A EP04251469 A EP 04251469A EP 1460352 A1 EP1460352 A1 EP 1460352A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- flap
- axle
- fire damper
- duct
- 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
Links
- 238000009423 ventilation Methods 0.000 claims abstract description 3
- 239000000779 smoke Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- 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
Abstract
Description
- The present invention relates to a fire damper for use in an air flow duct, and to a damper which can be used to regulate the flow of air in the duct.
- Dampers in air flow ducts are well known. A commonly used form of damper consists of a flap inside the duct, which is held in an open position, extending along the duct axis. A heavy spring biases the flap to a closed position where it is transverse to the duct axis to block off the duct. A temperature sensitive trigger holds the flap in the open position and releases the flap in the event of a temperature rise caused by fire, such as a flame front moving through the duct. Typically, the flap is mounted on an axle extending across the duct, and a handle may be provided on the axle end outside the duct to enable an operator to return the flap to the open duct position.
- As well as or instead of manual operation, such flaps may be fitted with a motorised control. One leading supplier of such motors is Belimo (www.bellimo.com/pdf/FireAndSmoke.pdf). A DC motor is fitted on the duct housing, over an exposed end of the flap axle. Usually the operation is 'normally closed', so that the motor is actuated to open the flap, and loss of power allows the flap to close under the force of the return spring. Other arrangements are possible, for example for smoke extraction in the event of a fire a flap may be closed by the motor and power removed to open the flap.
- A problem arises with the mounting of the electric motor on the shaft end. Usually the shaft is of round cross-section, whereas a square section shaft is wanted for connection to the motor via a socket driven by the motor.
- A first aspect of the present invention provides a fire damper in a ventilation duct, the damper comprising a flap which is pivotably mounted in the duct for movement from an open position, allowing air flow along the duct, to a closed position to inhibit air flow or the passage of flame along the duct, the flap is pivotally mounted on a round cross section axle which extends through the duct wall and a motor is mounted on the end of the axle for rotation of the flap, the motor having a polygonal socket for receiving the shaft end, wherein a protuberance is provided on the shaft surface for engagement with the socket wall to cause the axle to rotate with the socket.
- The protuberance may extend into an angle or corner formed between two sides to the socket.
- Preferably, protuberances are provided substantially diametrically opposite one another on the shaft.
- A protuberance may be formed by a pin which is positioned in a bore in the shaft. The end of the pin distal of the shaft may be tapered.
- The pin may extend through the shaft, forming protuberances on opposite sides of the shaft. Preferably the pin is angled where it leaves the shaft, and directed lengthways of the shaft. The pin may pivot relative to the shaft.
- It has been found that with this arrangement the alignment between to socket and pin is less crucial, the protuberance providing something of a universal joint to take up misalignment of the shaft and socket, particularly where the protuberance is pivotable relative to the shaft.
- Other aspects and preferred features of the invention will be apparent from the following description and the accompanying claims.
- The invention will now be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows schematically in cross-section a flap in an air flow duct;
- Figure 2 is a view on arrow A of Figure 1;
- Figure 3 is schematic view of a motor unit;
- Figure 4 is an end view of a drive socket of the motor unit of Figure 3 and illustrating one embodiment of the invention;
- Figure 5 is a perspective view of another embodiment of the invention, and
- Figure 6 shows the embodiment of Figure 5 in a socket.
- Figures 1 and 2
show duct wall 2 which is circular in cross-section. A continuouscircular rim 4 having an inwardly extendingflange 6 is riveted to theduct wall 2 at several positions around the rim by sealed rivets (not shown). Therim 4 has astep 8, to form awall portion 10 which is spaced from theduct wall 2. The rim serves to provide a mounting and a stable mating surface for a flap orblade 12, and also strengthens the duct to maintain the duct shape in the region of theflap 12 to provide improved operation. - The flap or
blade 12 is pivotably mounted on therim 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 theflap flange 6, when the flap is in the closed position. - Referring to Figure 2 the
flap 12 is mounted on anaxle 14 which rotate in ablind socket 16a formed on therim 4 at oneend 14a and extends through asleeve 16b in the duct wall at theother end 14b. Theaxle 14 is a good fit in thesocket 16a andsleeve 16b to reduce any tendency of the flap to wobble, and also to provide a degree of sealing against the passage of smoke when the flap is closed. - Heavy duty, i.e. strong,
coil springs 18 surround theaxle 14, and have oneleg 20 bearing on theflange 6, and theother leg 22 bearing on theflap 12 to bias the flap into the closed position, against theflange 6. - The
flap 12 is cut away at theedge 12e of thediameter region 12a, near theaxle 14, to just clear theflange 6. - The
flap 12 is overturned at its outer perimeter to form an axially extendingflange 12d and acorner 12f to embrace the rim at thecorner 11 formed at the radially outer edge of theflange 6 inportion 12c, and sit snugly at thecorner 11 formed between theflange 6 andwall 10 atflap portion 12b. Theflange 12d serves to strengthen theflap 12 to retain the shape of the flap during repeated operation and also provides an improved seal, as will be described hereinafter. - The construction thus far described is generally as seen in W002/043810. Other constructions of flap are well known in the art, and examples can be seen in EP-A-300992, which shows a square or rectangular flap, and EP-A-829689.
- In operation, the motor is driven to rotate the
flap 12 into the open position and hold it there, shown in dotted outline, against the force of thesprings 18. In the event of a fire, the motor power is cut off, allowing the flap to rotate to the closed position under the force of thesprings 18. The overlap of the perimeters of theflap portions adjacent flange 12d with theflange 6, and particularly the overlap at thecorners regions 12e, where theflap 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 motor 24, the
flap 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 theflap 12 would be set on installation of the system to balance air flow through the system, and then left. - In the
duct 2 the normal air flow is in the flow direction of arrow A. Thus the fixings, such as therivets holding rim 4 are closed or sealed. This reduces the risk of smoke escaping through the fixings once theflap 12 is closed. It will be appreciated the arrangement could be reversed, with air flowing in the direction of arrow B. - Referring to Figure 3 this shows schematically a motor unit 25 comprising a
socket 26 which is coupled to theshaft 28 of a motor 30, by gearing 32, housed in ahousing 34. Such motors are supplied by Belimo Automation AG of Switzerland. Typically,socket 26 may have aninternal bore 27 ofdiameter - As seen in Figure 4, the
wall 36 ofsocket bore 27 is a sixteen sided convex-concave polygon, having 8 apices orcorners 38. Thussocket bore 27 will receive a square section shaft in a number of orientations to allow for easy fitting of the motor unit over the shaft end and onto the duct wall. Bore 27 could be a simple concave shape such as a square or hexagonal cross section, for example, or have more apices. The present invention is concerned with fitting a round cross section shaft, typically a circular cross section shaft, intosocket 26 for rotation with the socket. - Shown in Figure 4 is a
steel shaft 14 with asteel pin 40 which extends through adiametral bore 42 in theshaft 14 to form two protuberances orprojections 44 extending from the shaftouter surface 14c so as to project between the adjacent walls of anapex 38. Theends 40a of thepin 40 are chamfered to sit more comfortably in theapices 38. It can be seen thatpin 40 allows for some play in the connection between theshaft 14 andsocket 26, which will serve to accommodate a small amount of misalignment between theshaft 14 andsocket 26.Pin 40 could be floating inbore 42 or fixed in position, for example by spot welding. - Referring to Figure 5, this shows in perspective view a
shaft 14 with apin 46 which extends through adiametral bore 42 in theshaft 14.Pin 46 is bent where it exits theshaft 14 to form protuberances in the form of twolegs shaft 14. Thepin 46 is free to rotate in thebore 42, as signified by the dotted outline. - As seen in Figure 6, the
legs 46 engage in theapices 38 of the socket bore 27. - Typically
shaft 14 may be 9mm diameter, and pin 46 may be 3mm diameter, but the chosen dimension will depend on the required strength forshaft 14, and the size of the socket - Various modifications will be apparent to those in the art. Although the invention has been described with particular reference to circular cross-section ducts, it can be used with rectangular or other cross-section ducts.
Claims (12)
- A fire damper in a ventilation duct, the damper comprising a flap which is pivotably mounted in the duct for movement from an open position, allowing air flow along the duct, to a closed position to inhibit air flow or the passage of flame along the duct, the flap is pivotally mounted on a round cross section axle which extends through the duct wall and a motor is mounted on the end of the axle for rotation of the flap, the motor having a polygonal socket for receiving the shaft end, wherein a protuberance is provided on the shaft surface for engagement with the socket wall to cause the axle to rotate with the socket.
- A fire damper as claimed in claim 1, wherein the protuberance extends into an apex formed between two sides of the socket wall.
- A fire damper as claimed in claim 1 or 2, wherein two protuberances are provided, substantially diametrically opposite one another on the shaft.
- A fire damper as claimed in any one of claims 1 to 4, wherein the protuberance is formed by a pin which is positioned in a bore in the shaft.
- A fire damper as claimed in claim 4, wherein the end of the pin distal of the shaft is tapered.
- A fire damper as claimed in claim 3, wherein the pin extends through the shaft, forming protuberances on opposite sides of the shaft.
- A fire damper as claimed in claim 6, wherein the pin is angled where it leaves the shaft, and directed lengthways of the shaft.
- A fire damper as claimed in claim 7, wherein the pin is pivotable relative to the shaft.
- A flap for a fire damper according to any one of claims 1 to 8, having an axle and a protuberance on the axle.
- A fire damper comprising a flap mounted on a rotatable axle, and a socket receiving an end of the axle, the socket having a polygonal inner surface, wherein a protuberance is provided on the shaft outer surface, the protuberance engaging with the socket wall to transfer rotational movement between the socket and the axle.
- A fire damper as claimed in claim 10, wherein the protuberance extends in the axial direction of the axle.
- A fire damper as claimed in claim 11, wherein the protuberance is pivotable relative to the shaft to extend at an angle to the axial direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0306178A GB2399498B (en) | 2003-03-18 | 2003-03-18 | Air flow controller and fire damper in an air flow duct |
GB0306178 | 2003-03-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1460352A1 true EP1460352A1 (en) | 2004-09-22 |
EP1460352B1 EP1460352B1 (en) | 2006-11-15 |
Family
ID=9954991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04251469A Expired - Lifetime EP1460352B1 (en) | 2003-03-18 | 2004-03-15 | Air flow controller and fire damper in an air flow duct |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1460352B1 (en) |
AT (1) | ATE345474T1 (en) |
DE (1) | DE602004003157D1 (en) |
GB (1) | GB2399498B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004058144B3 (en) * | 2004-11-30 | 2006-08-24 | Frank Wiedenfeld | Self regulating flow mixing limiter for building ventilation duct has flow regulating flap with propeller to vary effective flow |
WO2007006162A1 (en) * | 2005-07-14 | 2007-01-18 | Belimo Holding Ag | Actuator |
WO2012021724A2 (en) * | 2010-08-11 | 2012-02-16 | Board Of Regents, The University Of Texas System | Fabrication method of composite carbon nanotube fibers/yarns |
WO2015042636A1 (en) * | 2013-09-30 | 2015-04-02 | Framelock Structures Pty Ltd | Venting system |
JP6195326B1 (en) * | 2017-01-16 | 2017-09-13 | 株式会社野木製作所 | Damper unit |
CN114251466A (en) * | 2022-01-06 | 2022-03-29 | 春意环境科技有限公司 | Fireproof device for smoke prevention and exhaust air pipe and installation method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112546516B (en) * | 2021-01-13 | 2021-12-31 | 徐州市沂芯微电子有限公司 | Automatic accurate dolly of putting out a fire based on temperature scanner |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2869907A (en) * | 1956-07-20 | 1959-01-20 | Deliso John | Socket and rod coupling |
US4193541A (en) * | 1978-03-27 | 1980-03-18 | Energy Vent, Inc. | Damper latch |
US5169121A (en) * | 1990-12-24 | 1992-12-08 | Mitsubishi Electronics America, Inc. | Damper control mechanism |
EP0924475A1 (en) * | 1997-12-15 | 1999-06-23 | Kyoritsu Air Tech Inc. | Airflow-adjusting damper |
US6097123A (en) * | 1999-06-03 | 2000-08-01 | Johnson Controls Technology Company | Brake and stall detector for a motorized actuator |
US6198243B1 (en) * | 1999-02-23 | 2001-03-06 | Johnson Controls Technology Co. | Method for automatically determining range of movement of an electromechanical actuator |
US6431203B1 (en) * | 1999-02-01 | 2002-08-13 | Honeywell International Inc. | Actuator mounting assembly |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI89676C (en) * | 1992-10-01 | 1993-11-10 | Halton Oy | DRIVANORDNING FOER BRANDSPJAELL OCH FOERFARANDE VID DRIFTEN AV ETT BRANDSPJAELL |
US5533929A (en) * | 1993-12-29 | 1996-07-09 | Attridge, Jr.; Russell G. | Remotely trippable and resettable damper |
US5501542A (en) * | 1994-09-23 | 1996-03-26 | Farmatic Research, Inc. | Rapid coupling for a supported, driven shaft |
AU2002220847A1 (en) * | 2000-12-01 | 2002-06-11 | Tri-Air Innovations Limited | Air flow controller and fire damper in an air flow duct |
-
2003
- 2003-03-18 GB GB0306178A patent/GB2399498B/en not_active Expired - Fee Related
-
2004
- 2004-03-15 EP EP04251469A patent/EP1460352B1/en not_active Expired - Lifetime
- 2004-03-15 DE DE602004003157T patent/DE602004003157D1/en not_active Expired - Lifetime
- 2004-03-15 AT AT04251469T patent/ATE345474T1/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2869907A (en) * | 1956-07-20 | 1959-01-20 | Deliso John | Socket and rod coupling |
US4193541A (en) * | 1978-03-27 | 1980-03-18 | Energy Vent, Inc. | Damper latch |
US5169121A (en) * | 1990-12-24 | 1992-12-08 | Mitsubishi Electronics America, Inc. | Damper control mechanism |
EP0924475A1 (en) * | 1997-12-15 | 1999-06-23 | Kyoritsu Air Tech Inc. | Airflow-adjusting damper |
US6431203B1 (en) * | 1999-02-01 | 2002-08-13 | Honeywell International Inc. | Actuator mounting assembly |
US6198243B1 (en) * | 1999-02-23 | 2001-03-06 | Johnson Controls Technology Co. | Method for automatically determining range of movement of an electromechanical actuator |
US6097123A (en) * | 1999-06-03 | 2000-08-01 | Johnson Controls Technology Company | Brake and stall detector for a motorized actuator |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004058144B3 (en) * | 2004-11-30 | 2006-08-24 | Frank Wiedenfeld | Self regulating flow mixing limiter for building ventilation duct has flow regulating flap with propeller to vary effective flow |
WO2007006162A1 (en) * | 2005-07-14 | 2007-01-18 | Belimo Holding Ag | Actuator |
CN101263345B (en) * | 2005-07-14 | 2012-04-25 | 贝利莫控股公司 | Actuator |
WO2012021724A2 (en) * | 2010-08-11 | 2012-02-16 | Board Of Regents, The University Of Texas System | Fabrication method of composite carbon nanotube fibers/yarns |
WO2012021724A3 (en) * | 2010-08-11 | 2012-06-07 | Board Of Regents, The University Of Texas System | Fabrication method of composite carbon nanotube fibers/yarns |
WO2015042636A1 (en) * | 2013-09-30 | 2015-04-02 | Framelock Structures Pty Ltd | Venting system |
JP6195326B1 (en) * | 2017-01-16 | 2017-09-13 | 株式会社野木製作所 | Damper unit |
CN114251466A (en) * | 2022-01-06 | 2022-03-29 | 春意环境科技有限公司 | Fireproof device for smoke prevention and exhaust air pipe and installation method thereof |
Also Published As
Publication number | Publication date |
---|---|
GB2399498A (en) | 2004-09-22 |
GB0306178D0 (en) | 2003-04-23 |
GB2399498B (en) | 2005-08-17 |
EP1460352B1 (en) | 2006-11-15 |
ATE345474T1 (en) | 2006-12-15 |
DE602004003157D1 (en) | 2006-12-28 |
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