EP0762054B1 - Fluid-carrying duct element and a sleeve section for placing around said element - Google Patents
Fluid-carrying duct element and a sleeve section for placing around said element Download PDFInfo
- Publication number
- EP0762054B1 EP0762054B1 EP96202391A EP96202391A EP0762054B1 EP 0762054 B1 EP0762054 B1 EP 0762054B1 EP 96202391 A EP96202391 A EP 96202391A EP 96202391 A EP96202391 A EP 96202391A EP 0762054 B1 EP0762054 B1 EP 0762054B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- duct element
- duct
- fluid carrying
- fluid
- flange
- 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.)
- Expired - Lifetime
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/02—Linings; Jackets; Casings
- F23J13/025—Linings; Jackets; Casings composed of concentric elements, e.g. double walled
-
- 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
- F23L17/04—Balanced-flue arrangements, i.e. devices which combine air inlet to combustion unit with smoke outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2211/00—Flue gas duct systems
- F23J2211/10—Balanced flues (combining air supply and flue gas exhaust)
- F23J2211/101—Balanced flues (combining air supply and flue gas exhaust) with coaxial duct arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Pipe Accessories (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Liquid Developers In Electrophotography (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Ventilation (AREA)
Abstract
Description
- The invention relates to conducting a fluid flow along the outside of a fluid-carrying duct element, for example the combustion air supply of a flue gas discharge of a combustion chamber. In particular, but not exclusively, the invention relates to flues projecting beyond a building, which flues may be directed vertically, horizontally or at any angle in between. A specific example of such flues are the combustion air supply pipes and flue gas discharge pipes which, with a space in between, run essentially concentrically and whose orifices opening into the environment (the air intake orifice and the combustion gas discharge orifice, respectively) open into the environment at a considerable distance from one another.
- A fluid carrying duct element according to the preamble of claim 1 is disclosed in EP-A-0.654.638. This publication shows a supply hood arranged over the mouth of the combustion air supply pipe. This hood defines a supply channel to said mouth, which supply channel has a downwardly facing inlet opening. On the outside of the supply pipe there are provided two head up rings, one of which is arranged at a distance below the inlet opening of the hood. Inside the hood there is provided a number of radial plate-like spacers distributed in circumferential direction. These spacers carry the hood, and will probably have a guiding effect on air supply to the supply pipe via the hood.
- Further, FR-A-2.546.612 discloses a fluid-carrying duct element carrying a supply hood arranged over the mouth of the combustion air supply pipe which hood defines a supply channel to said mouth. The inlet opening of the supply channel is defined between the underside of the hood and a flange slanting in downward direction from the mouth of the combustion air supply pipe. In the hood are arranged vertical partitions, extending from inside the hood up to the slanting flange.
- The object of the invention is to improve the control of a fluid flow along the outside of the duct element, in particular with an eye to improved control of the flow conditions within the duct element, such as the uniformity of the fluid flow velocity or the level of the fluid pressure.
- To this end, the present invention presents a fluid-carrying duct element in accordance with the combination of measures summarized in the appended Claim 1 as well as a sleeve section according to
claim - It was found that the greatest control effect by means of the invention is achieved if the delimiting members and resistance elements are used in conjunction with a shell section having an end baffle being arranged loosely around the duct element and around the mouth for connection to the inside of the duct element, so that the shell section with end baffle, preferably positioned essentially concentrically around the duct element, forms a preferably annular feeder duct towards said mouth (i.e. the inflow mouth of the duct element), and which opens in the direction of, and at a distance from, the resistance elements. Such a shell section with end baffle is, in the context of flues, sometimes referred to as ventilation bowl, which in that context cooperates with the duct for supplying combustion air to a furnace.
- Preferably, the resistance elements and delimiting members, at least one of the delimiting members, are designed as components which are separate from the fluid-carrying duct element, so that they can be kept in stock as separate components and it is also possible for their position with respect to the mouth for inward connection in the duct element to be adjustable.
- A cowl is positioned around and over the mouth of the duct element so as to form a feeder duct towards said mouth, the inlet of the feeder duct being delimited by the cowl and the duct element and opening towards the delimiting member which is situated outside the cowl, preferably at a distance from the inlet, and the resistance elements being positioned around the duct element, outside the cowl, at that side of the delimiting member which faces the inlet, and at a distance from the inlet. As a result of the resistance elements outside the cowl, which may be a cowl known per se, an additional thrust effect inside the cowl and the duct element is accomplished, the throughput of fluid through the duct element consequently being improved. Surprisingly it proved possible thus to improve the throughput delivery of known, relatively ineffective cowls. It is therefore possible, by fitting a relat vely simple and inexpensive additional component on the duct element, at a lower position than the cowl fitted thereon, to improve the supply of combustion air to a furnace without having to make fundamental changes to the system as a whole.
- The invention is hereinafter explained in more detail on the basis of an illustrative embodiment with reference to the accompanying drawing, in which:
- Figure 1 schematically shows a side view of a flue having concentric tubes, constructed according to the invention;
- Figure 2 shows a perspective side view of the topmost section of the flue shown in Figure 1; and
- Figure 3 shows a view corresponding to Figure 2 of a section of an alternative embodiment.
-
- Figure 1 shows a flue 1 according to the invention. This comprises two
tubes 2, 3, fitted concentrically inside one another and at a distance from one another. Theinner tube 2 is designed to be connected to the flue gas discharge of an otherwise essentially closed combustion chamber, for example of a hot-water supply or a central heating facility for domestic application, said combustion chamber optionally being situated inside a building. The tube 3 is suitable for connection to the combustion air supply of such a furnace. To this end, the lower end, in the drawing, of the tube 3 may be connected in a conventional manner, via a branchpipe part of known design, to the air supply orifice of said furnace. As indicated at 4, the flue 1 is provided with a circumferential recess, running all the way round, in a pipe 3 section thickened for insulation purposes, to achieve an essentially airtight penetration through the roof 5 of a building. The tube 3 ends within a ventilation cowl 6 (sometimes referred to as ventilation bowl), whereas thetube 2 continues past said ventilation cowl 6, so that the respective mouths of thetubes 2 and 3 open into the environment, outside the building, at a distance from one another, seen in the longitudinal direction of the flue 1. As can be seen more clearly from Figure 2, the ventilation bowl 6 comprises a loosely fitting shell 7 which surrounds the tube 3 at a distance and essentially concentrically and, at its end facing away from themouth 9 of the tube 3, carries anend baffle 8 via which the ventilation bowl 6 is fastened to thetube 2. The cowl 6 forms a feeder duct towards the (inflow)mouth 9 of the tube 3. The latter'sinlet 20 situated on the underside of the cowl 6 is delimited by the cowl 6 and the tube 3. As depicted, the shell section 7 is of conical shape. Other suitable shapes are also conceivable, however. Theend baffle 8 can further be formed by a continuation of the preferably conical design of the shell section or may exhibit a different shape, tapering towards thetube 2. The shell section 7 and/or theend baffle 8 may carry further ventilation facilities such as orifices, so that a gas flow from the environment towards the mouth 9 (saidmouth 9 forming the inflow mouth of the so-called duct element, in this case the tube 3) is not exclusively restricted to the area at the end of the shell section 7, facing away from theend baffle 8. Thatend 10 of thetube 2 which opens into the environment carries acowl 11, provided with a condensate drain, a leakage ring 12 and acondensate collecting bowl 13 by means of which condensate is passed back into thetube 2. As it happens, the design of theend 10 is not essential for the invention; other designs are likewise conceivable. - At a distance below the ventilation bowl 6 there are, at the outside of the pipe 3, features 14 for the purpose of directing the fluid flow along the outside of the tube 3. What is shown is a
flange 15, which projects essentially radially from the tube 3 and, at the side of said flange which faces themouth 9 of the tube 3, a series oflips 16 which have spaces in between and which project in a ring-shaped pattern from the circumference of the tube 3. The principal surface of thelips 16 is directed essentially perpendicularly to the principal surface of theflange 15. Other angles between the principal surfaces of thelips 16 and theflange 15 are, however, likewise conceivable. It will be obvious to those skilled in the art how theflange 15 and thelips 16 should be designed to achieve a flow resistance in the longitudinal direction and the circumferential direction, respectively, of the tube 3. As shown, thelips 16 are punched from a ring 17 which is designed, integrally with theflange 15, as aseparate component 14. Instead of being rectangular, the shape of the lips may also take any other conceivable form, such as rounded or, for example, tapering to a point. The principal surfaces of thelips 16 and theflange 15 may be planar, but may also, for example, be corrugated, fluted or nonplanar in some other way, for example so as to exert an additional flow resistance on the fluid flow. Thefeatures 14 may be made of any suitable material such as metal or plastic. - The
elements 14 have a beneficial effect on the flow behaviour along the outside of the tube 3. The ventilation bowl 6, especially itsbaffle 8, forms also a delimiting member, so that there are two delimiting members with the resistance elements and the mouth in between them. - Figure 3 shows a variation on the
elements 14 giving rise to a flow resistance. Thelips 16 have now been replaced by dish elements which have arisen from a pleated collar which is fitted around thetube 13. - Both the
flange 15 and the baffle elements orlips 16 may be provided with, for example, further profiling or alternatively orifices for further control of the fluid flow. By means of, for example, orifices in theflange 15 and/or thebaffle elements 16 it is possible to allow a portion of a fluid flow to pass saidelements 15 and/or 16. - The invention is based on the insight that by means of the cooperation of elements, which cause a flow resistance or an obstacle to a flow in the longitudinal direction of the duct element respectively in the circumferential direction, the fluid flow outside the duct element can be controlled in the direction to the mouth. This is advantageous, in particular, in the case of, for example, flues which are subject to varying wind directions, so that the prevailing wind direction and wind speed has a verifiable effect on, for example the behaviour of the fluid flow and, for example, the pressure within the duct element. The abovementioned effect can be achieved very simply by positioning, below the air inlet cowl at some distance from its inflow orifice situated underneath, a ring which fits around the duct element, extends transversely to the duct element and, at its top side facing the inflow orifice, is provided with baffles which essentially extend vertically. The invention therefore also relates to an annular disc for fitting on/around a duct element, the annular disc at one of its sides being provided with baffles which essentially extend transversely with respect to the disc.
Claims (17)
- Fluid-carrying duct element (3) having:at a mouth (9) at its outside a ventilation bowl (6), which is arranged concentrically loosely around the duct element (3) and over the mouth (9) of the duct element (3) so as to form a feeder duct towards said mouth (9) of the duct element (3), said feeder duct having a downwardly opening inlet (20);one or more resistance elements (16) for generating a flow resistance or obstacle to the flow in a circumferential direction around the duct element (3) transverse to the longitudinal direction of the duct element (3), said resistance elements being arranged outside the duct element (3) interspaced from one another around the circumference of the duct element; andon the outside of the duct element (3), at least one delimiting member (15) for generating a flow resistance or obstacle to the flow in a longitudinal direction of the duct element (3), said delimiting member being arranged outside the ventilation bowl (6) at a distance from the downwardly opening inlet (20) of the feeder duct;
- Fluid carrying duct element according to claim 1, characterized in that the resistance elements comprise protrusions (16), such as lips, projecting from the circumference of the duct element (3) and having principal planes which are at an angle with respect to a transverse plane perpendicular to the longitudinal direction of the duct element (3).
- Fluid carrying duct element according to claim 2, characterized in that the vertical axes of the principal planes of the protrusions (16) are directed essentially parallel to the longitudinal direction of the duct element (3).
- Fluid carrying duct element according to one of the preceding claims, characterized in that the at least one delimiting member comprises a flange (15), discontinuous or continuous, which essentially runs around the fluid-carrying duct element and projects from its circumference, preferable essentially radially.
- Fluid carrying duct element according to one of the preceding claims, characterized in that the delimiting member comprises a flange (15), which essentially runs around the fluid carrying duct element and which is designed integrally with a ring (17) contiguous to the inner contour of the flange, and that the resistance elements comprise lips punched from the ring and bent outwardly.
- Fluid carrying duct element according to one of the claims 1-4, characterized in that the resistance element comprises a pleated collar, which is fitted around the duct element and has a plurality of baffle elements (16) generating a flow resistance in the circumferential direction.
- Fluid carrying duct element according to one of the preceding claims, characterized in that the resistance elements (16) are arranged in cooperation, so as to control the fluid flow, with the ventilation bowl.
- Fluid carrying duct element according to one of the preceding claims, characterized in that the feeder duct is annular.
- Fluid carrying duct element according to one of the preceding claims, characterized in that the fluid carrying duct element is a combustion air supply duct to a, preferably otherwise essentially closed, combustion chamber.
- Fluid carrying duct element according to one of the preceding claims, characterized in that the duct element is one of two duct elements essentially concentrically surrounding one another with a space in between; the one, preferably the outermost one, forming a combustion air supply to a, preferably otherwise essentially closed, combustion chamber, and the other forming a flue gas discharge of the combustion chamber.
- Fluid carrying duct element according to one of the preceding claims, characterized in that one of the delimiting members and the adjoining resistance element cooperating therewith are designed as a separate component, which is separate from the duct element, and in which the delimiting member and the adjoining resistance member preferably form part of a separate sleeve section (14) which surrounds the duct element.
- Fluid carrying duct element according claim 11, characterized in that the separate component (14) is a separate sleeve section surrounding the duct element (3) in which the sleeve section comprises:a ring (17) having an internal profile essentially matching the outer periphery of the fluid carrying duct element (3),a, continuous or discontinuous, flange (15) defining the delimiting member, and running essentially in circumferential direction of the ring (17),protrusions (16) defining the resistance elements, which protrusions are lip-shaped or have some other shape,
- Fluid carrying duct element according to claim 11 or 12, characterized in that the position of said delimiting member and said adjoining resistance element is adjustable with respect to the mouth (9).
- Sleeve section (14) suitable for being placed around a fluid carrying duct element (3), at a distance from the downwardly opening inlet (20) of a ventilation bowl (6), which is arranged concentrically around the duct element (3) and over a mouth (9) of the duct element (3) so as to form a feeder duct towards said mouth (9) of the duct element, characterized in that the sleeve section (14) comprises:a ring (17) having an internal profile essentially matching the outer periphery of the fluid carrying duct element (3),a, continuous or discontinuous, flange (15) running essentially in circumferential direction of the ring (17) for generating a flow resistance or obstacle to the flow in a longitudinal direction of the duct element,protrusions (16) for generating a flow resistance or obstacle to the flow in a circumferential direction around the duct element (3) transverse to the longitudinal direction of the duct element (3)
- Sleeve section according to claim 14, characterized in that the principal plane of the protrusions (16) is at an angle perpendicular to the plane of the flange.
- Sleeve section according to claim 14 or 15, characterized in that the protrusions (16) are lips punched from the ring (17) and bent outwardly.
- Sleeve section suitable for being placed around a fluid carrying duct element at a distance from the downwardly opening inlet (20) of a ventilation bowl (6), which is arranged concentrically around the duct element (3) and over a mouth (9) of the duct element (3) so as to form a feeder duct towards said mouth (9) of the duct element (3), characterized in that the sleeve section comprises a collar pleated around an inner profile, such that the pleats form a plurality of baffle elements for generating a flow resistance or obstacle to the flow in a circumferential direction around the duct element (3) transverse to the longitudinal direction of the duct element (3), in which the inner profile of the collar essentially matches the outer periphery of the fluid carrying duct element, and that the sleeve section is provided with an annular disc (15) projecting transversely from the inner profile to the outer periphery of the collar for generating a flow resistance or obstacle to the flow in a longitudinal direction of the duct element, in which the baffle elements and disc can in cooperation direct the fluid flow along the outside of the duct element (3) in the direction to the inlet (20) of the bowl (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL1001077A NL1001077C2 (en) | 1995-08-28 | 1995-08-28 | Fluid-carrying channel element provided with resistance members as well as sleeve part provided with resistance members for application to such a channel element. |
NL1001077 | 1995-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0762054A1 EP0762054A1 (en) | 1997-03-12 |
EP0762054B1 true EP0762054B1 (en) | 1999-05-06 |
Family
ID=19761503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96202391A Expired - Lifetime EP0762054B1 (en) | 1995-08-28 | 1996-08-28 | Fluid-carrying duct element and a sleeve section for placing around said element |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0762054B1 (en) |
AT (1) | ATE179791T1 (en) |
DE (1) | DE69602326T2 (en) |
NL (1) | NL1001077C2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140209087A1 (en) * | 2013-01-25 | 2014-07-31 | M&G DuraVent, Inc. | Dual category venting system |
CN105863181B (en) * | 2016-04-07 | 2018-07-17 | 中国十七冶集团有限公司 | A kind of roof structure layer new structure steam exhausting way |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2546612B3 (en) * | 1983-05-24 | 1986-06-20 | Zaniewski Michel | ARRANGEMENT OF DEVICES TO FACILITATE THE CONSTRUCTION OF APARTMENT FIREPLACES AND IMPROVE THEIR PERFORMANCE |
NL8700395A (en) * | 1987-02-17 | 1988-09-16 | Cox Geelen Bv | Flat cowl for double-walled chimney - has inner and outer tube, inner one carrying cover plate and top annular plate with skirt towards which outer tube widens |
NL9002786A (en) * | 1990-12-17 | 1992-07-16 | Burgerhout Bv | COMBINED BURNER AIR SUPPLY AND COMBUSTION GAS OUTLET. |
NL9301246A (en) * | 1993-07-15 | 1995-02-01 | Muelink & Grol Bv | Combined burner air supply and combustion gas discharge. |
NL9302032A (en) * | 1993-11-24 | 1995-06-16 | Ubbink Nederland Bv | Outlet construction for closed gas appliances. |
-
1995
- 1995-08-28 NL NL1001077A patent/NL1001077C2/en not_active IP Right Cessation
-
1996
- 1996-08-28 DE DE69602326T patent/DE69602326T2/en not_active Expired - Fee Related
- 1996-08-28 AT AT96202391T patent/ATE179791T1/en not_active IP Right Cessation
- 1996-08-28 EP EP96202391A patent/EP0762054B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
NL1001077C2 (en) | 1997-03-03 |
DE69602326T2 (en) | 1999-12-30 |
EP0762054A1 (en) | 1997-03-12 |
DE69602326D1 (en) | 1999-06-10 |
ATE179791T1 (en) | 1999-05-15 |
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