EP0753703A2 - Schornsteinkopf - Google Patents

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Publication number
EP0753703A2
EP0753703A2 EP96305152A EP96305152A EP0753703A2 EP 0753703 A2 EP0753703 A2 EP 0753703A2 EP 96305152 A EP96305152 A EP 96305152A EP 96305152 A EP96305152 A EP 96305152A EP 0753703 A2 EP0753703 A2 EP 0753703A2
Authority
EP
European Patent Office
Prior art keywords
cowl
chimney
flue
disc
further characterized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96305152A
Other languages
English (en)
French (fr)
Other versions
EP0753703A3 (de
EP0753703B1 (de
Inventor
Robert Hodgson
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.)
Individual
Original Assignee
Individual
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
Priority claimed from GBGB9514174.3A external-priority patent/GB9514174D0/en
Application filed by Individual filed Critical Individual
Publication of EP0753703A2 publication Critical patent/EP0753703A2/de
Publication of EP0753703A3 publication Critical patent/EP0753703A3/de
Application granted granted Critical
Publication of EP0753703B1 publication Critical patent/EP0753703B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/08—Tops for chimneys or ventilating shafts; Terminals for flues with coaxial cones or louvres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/02—Tops for chimneys or ventilating shafts; Terminals for flues
    • F23L17/12—Devices for fastening the top or terminal to chimney, shaft, or flue

Definitions

  • This invention relates to cowls, namely constructions for fitting to the distal end of a chimney pot or a flue pipe for exhaust gases, usually from a domestic fire, boiler or burner.
  • cowls namely constructions for fitting to the distal end of a chimney pot or a flue pipe for exhaust gases, usually from a domestic fire, boiler or burner.
  • Such constructions are generally designed to at least mitigate the effect of wind, rain or other inclement atmospheric conditions.
  • cowls which achieve a venturi effect of sorts are that sold under the Trade Marks MINITROMB, STATITROMB and BATITROMB from the French manufacturers Ventilation Tirage Innovation.
  • These models of cowl consist of a body of stainless steel formed as a stepped cone, each circumextending step of the cone being narrower than the preceding one in the direction of the distal extremity of the cowl.
  • Aerocowl flue stabilizer an example of which is illustrated in cross-section in Fig. 1 of the drawings which follow.
  • the Aerocowl system includes a number of generally dish-shaped discs open in the centre and held together by a number of vertical posts. Across the centre of the cowl between the top two discs is an element described as an aerofoil in Aerocowl's literature. Though their literature refers to the space between the lower two discs providing a venturi effect, this will largely be exacerbated by the space between the lower disc and the chimney which appears to achieve an opposite effect and also by the space between the upper two discs which again appears to achieve an opposite effect.
  • the Aerocowl system which in a complete arrangement also has a circumextending bird guard within the central space is complicated to manufacture and uncertain in its aerodynamic effect.
  • the Aerocowl design is less than ideal for one further reason, namely that the cowl has a substantial vertical extent of the order at least of the diameter of the chimney flue with which it is intended to cooperate.
  • cowl design such as the successful Colt Top cowl and the Eurocowl cowl a relatively flat or shallow design in which the vertical height of the cowl is significantly less than the diameter of the chimney opening with which the cowl is designed to cooperate is preferred.
  • the present invention has arisen from my work seeking to improve upon the design of cowls generally and to provide a true venturi design which operates efficiently and effectively both to exclude rain and other precipitation and effectively remove smoke and other exhaust flue gases while at the same time being relatively shallow in configuration and easy to fabricate.
  • a cowl comprising: a first generally disc-shaped member adapted to extend across the opening of a chimney or other flue at a vertical spacing above the distal end of the chimney or flue which is substantially less than the diameter of the disc-shaped member; a second disc-shaped member open at its centre and dished to form a shallow cone; first fixing means for mounting the first member above the second member above the distal end of the chimney or flue, so that the vertical separation between the first and second members is least at the periphery of the centre opening of the second member and increases monotonically outwardly from such periphery, whereby the space between the first and second members provides a venturi effect, airflow caused by wind from any quarter resulting in relatively reduced air pressure in the space above the centre opening in the second member whereby to encourage smoke or flue gases to pass up the chimney or flue to be entrained in air passing across the said centre opening between the two members; and second fixing means cooperating with the second member for firmly mounting the cowl to
  • the cowl Because the spacing of the first member above the distal end of the chimney or flue is relatively small, the cowl has a generally shallow compact appearance. Nevertheless, by having the spacing between the two disc shaped members at its least at the periphery of the centre opening of the second member, a strong venturi effect is created above the centre opening in the second member. Since the construction is effectively open through 360° apart from such obstruction as may be caused by the first fixing means, the venturi effect is both strong and nondirectional. In other words, from whichever quarter the wind blows and whether the wind direction should change or not, the effect of the wind is that smoke and other exhaust gases tend to be drawn vertically up the chimney to be entrained in air blowing across the top of the chimney. The venturi effect is enhanced the faster the wind speed.
  • the first fixing means may conveniently comprise vertical posts mounted between and connecting the two discs.
  • the first disc may be completely flat but in one arrangement described below is slightly dished by the creation of shallow generally radial flutes in the disc which also serve a stiffening function as well as slightly dishing the disc.
  • the second member is dished to a substantially greater extent than the first member. Again this is preferably achieved by means of fluting.
  • the same tool can be made to form the flutes both in the first and in the second member, the flutes in the second member being substantially greater than in the first member.
  • the flutes can be formed by pressing and may form a housing for hook bolts which serve as the second fixing means for attaching the second member and thus the unit as a whole to the chimney pot or flue pipe.
  • a circumextending bird guard mesh is preferably mounted between the first and second members radially inwardly of the vertical posts.
  • first and second members are disc shaped and as having a diameter, it will be readily understood that it is not necessary that the disc be truly circular in configuration, although this will usually be the most convenient arrangement.
  • the disc may have a square or other straight edge profile and "diameter" is to be interpreted appropriately depending upon the external profile of the disc.
  • the second and third members are spaced by a distance which may be greater than the distance between the first and second members and in the most preferred arrangement are identical fluted shallow dished discs, apart from the size of the central opening in the second and third members, the third member having an opening which may be of the order of or slightly less than the inner diameter of the flue or chimney.
  • the disc cut from the third member to provide its central opening may be used to form the first member.
  • the second and third members may be dished to the same extent or the second member may be dished less than the third member so there is also a venturi effect between the second and third members, the second member should not be dished to a greater extent than the third member because this would have the effect of counteracting the venturi effect between the first and second members.
  • an Aerocowl flue stabilizer generally indicated 10 which comprises 3 annular members 11, 12 and 13 mounted on a plurality of posts 14 and with an obstruction, described in their literature by Aerocowl as an aerofoil, is mounted across the central through opening in the cowl between the upper 11 and middle 12 discs.
  • the profile of discs or vanes 12 and 13 results in a venturi effect being produced where these two vanes open at 16 into the central region of the cowl but this will be negated by the opposing geometry of the passages 17 and 18 between the lowermost vane and the chimney pot and between the upper 11 and middle 12 vanes.
  • Capper 20 comprises a disc shaped member 21 best shown in Fig. 3 which is dished by the formation of shallow flutes 22 which are widest at the periphery of the disc and narrow towards the centre. These flutes provide housings for hook bolts 23, small plates being mounted across the underside of the flutings to hold the hook bolts in position. The hook bolts are threaded at 24 for wing nuts 25.
  • the fluting can be formed by pressing with simple tools and so is easy to fabricate. The whole arrangement can readily be fitted to a redundant chimney pot or flue.
  • Cowl 30 of Figs. 4 to 7 makes use of the technology developed for the Hodgson capper 20.
  • Cowl 30 comprises two disc shaped members of which the upper 31 is only slightly dished by shallow fluting 32 in the manner of capper 20 while the lower 33 is dished to a greater extent by more pronounced fluting 34, again in the manner of capper 20.
  • the two discs are best shown in perspective in Fig. 5 and the lower disc is shown in Fig. 6.
  • the lower disc 33 has an open centre 35 and the two discs are fitted together by a plurality of posts 36 fitted to holes 37 drilled or punched in the two discs. A circumextending wire mesh 38 around the inside of the posts 36 serves to prevent entry of birds into the interior of the cowl and down the chimney pot. Housings for hook bolts 39 are created in the flutings 34 by fixing small plates 40 across the underside of the respective flutings to the lower disc 33. It will thus be seen that the lower disc 33 is substantially similar to the capper 20 of Figs. 2 and 3 save for its centre opening 35.
  • the vertical space between the first 31 and second 33 discs is least at the periphery 41 of centre opening 35 and progressively increases towards the outer edges of the disc.
  • a classic venturi is created in the centre of the cowl.
  • the narrowing cross-section results in an increased air flow velocity and thus a lowered pressure.
  • the lower pressure in centre opening 35 results in smoke and fumes in the chimney being sucked up into the natural air flow to be carried away from the chimney cowl. Should the wind change to a different direction, the effect will remain because the cowl is essentially symmetrical (apart from the respective fixing means) over 360°.
  • cowl of the basic construction illustrated namely with the two disc members and the venturi created in the centre by having the least spacing between the two discs at the periphery of the centre opening and the spacing increasing monotonically outwards, could be created in various ways.
  • the modified arrangement illustrated in Fig. 8 has a second member 33 which is essentially the same as the second member of the embodiment of Figs. 4, 5 and 6.
  • a first member 42 is mounted by posts 43 above the centre opening defined by the inner peripheral edge 41 of member 33.
  • the spacing, however, between the first 42 and second 33 members is less in the arrangement of Fig. 8 than in the previously described embodiment.
  • the spacing between the first and second members is desirably 16 mm or less.
  • the second member does not rest on the chimney cowl itself as in the arrangement of Figs. 4, 5 and 6 but is itself supported by further posts 44 above a third member 45. Desirably, as shown in Fig.
  • the third member 45 is generally similar to the second member 33, being formed as a shallow fluted dish carrying the hook bolts 39 as in the previously described embodiment for fixing the cowl to the chimney top.
  • the difference between the two shallow dishes 33 and 45 is that the opening defined by inner peripheral edge 46 of third member 45 is substantially greater than the opening defined in the member.
  • the material cut from the centre of member 45 before it is dished using the same tool as for member 33 is used to provide the first member 42.
  • the diameter of the opening in the third member is identical in size to the diameter of the first member 42 in this embodiment.
  • a bird guard 47 is mounted between the second and third members.
  • the spacing between the second and third members which is significantly greater than the spacing between the first and second members is such that the natural updraught of smoke and flue gases can still readily escape without significant obstruction.
  • the overall height of the cowl is greater than in the arrangement of Figs. 4, 5 and 6, it will be seen that the overall height of the cowl is still less than the diameter of the chimney opening and significantly less than the overall diameter of the cowl. In other words, even with three members rather than two, the cowl of Fig. 8 still presents a relatively shallow profile.
  • the geometry of the second and third members should be such that there is not a counteracting effect between those two members.
  • the members may have essentially the same inclination or the inclination of the second member may be less than the third member, the reverse situation where the inclination of the third member is less than that of the second member should be avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Chimneys And Flues (AREA)
  • Ventilation (AREA)
EP19960305152 1995-07-12 1996-07-12 Schornsteinkopf Expired - Lifetime EP0753703B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9514174 1995-07-12
GBGB9514174.3A GB9514174D0 (en) 1995-07-12 1995-07-12 Cowl
GB9523483 1995-11-16
GB9523483A GB2303202B (en) 1995-07-12 1995-11-16 Cowl

Publications (3)

Publication Number Publication Date
EP0753703A2 true EP0753703A2 (de) 1997-01-15
EP0753703A3 EP0753703A3 (de) 1998-06-17
EP0753703B1 EP0753703B1 (de) 2003-05-14

Family

ID=26307375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960305152 Expired - Lifetime EP0753703B1 (de) 1995-07-12 1996-07-12 Schornsteinkopf

Country Status (2)

Country Link
EP (1) EP0753703B1 (de)
DE (1) DE69628094T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2796451A1 (fr) * 1999-07-12 2001-01-19 T A Soc D Expl As Extracteur statique extensible
FR2846073A1 (fr) 2002-10-21 2004-04-23 Michel Zaniewski Extracteur statique antireflueur pour fumees
CN102401442A (zh) * 2011-11-25 2012-04-04 无锡市工业设备安装有限公司 内伞形节能通风风帽
CN103485518A (zh) * 2012-06-13 2014-01-01 张琦 拔气排风帽

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9869095B2 (en) 2014-08-21 2018-01-16 Solarcity Corporation Exhaust gas panel vent assembly for roof-mounted photovoltaic systems
US10323418B2 (en) 2014-10-10 2019-06-18 Solarcity Corporation Vent cover assembly for use with roof-mounted photovoltaic systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB885106A (en) * 1959-10-21 1961-12-20 Gas Council Improvements relating to flue terminals
FR2435672A1 (fr) * 1978-09-06 1980-04-04 Grp Interet Eco Maison Appareil pour la ventilation naturelle de locaux
GB8427993D0 (en) * 1984-11-06 1984-12-12 Colt London Ltd W H Chimney cowls
BE901401A (nl) * 1984-12-27 1985-04-16 Neefs Anthony Inrichting voor het bevorderen van de trek in gasafvoerkanalen.
ATE39020T1 (de) * 1985-08-09 1988-12-15 Roweco Kaminhaube zur ueberwachung des zuges in einem kaminrohr.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2796451A1 (fr) * 1999-07-12 2001-01-19 T A Soc D Expl As Extracteur statique extensible
FR2846073A1 (fr) 2002-10-21 2004-04-23 Michel Zaniewski Extracteur statique antireflueur pour fumees
CN102401442A (zh) * 2011-11-25 2012-04-04 无锡市工业设备安装有限公司 内伞形节能通风风帽
CN103485518A (zh) * 2012-06-13 2014-01-01 张琦 拔气排风帽
CN103485518B (zh) * 2012-06-13 2016-06-08 张琦 拔气排风帽

Also Published As

Publication number Publication date
DE69628094D1 (de) 2003-06-18
EP0753703A3 (de) 1998-06-17
EP0753703B1 (de) 2003-05-14
DE69628094T2 (de) 2004-04-01

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