EP0293332B1 - Chimney cowl - Google Patents

Chimney cowl Download PDF

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Publication number
EP0293332B1
EP0293332B1 EP88810350A EP88810350A EP0293332B1 EP 0293332 B1 EP0293332 B1 EP 0293332B1 EP 88810350 A EP88810350 A EP 88810350A EP 88810350 A EP88810350 A EP 88810350A EP 0293332 B1 EP0293332 B1 EP 0293332B1
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EP
European Patent Office
Prior art keywords
outer jacket
chimney
jacket
outlet opening
pipe socket
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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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EP88810350A
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German (de)
French (fr)
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EP0293332A3 (en
EP0293332A2 (en
Inventor
Gert Basten
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Basten Maria Sibylle
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Basten Maria Sibylle
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Priority to AT88810350T priority Critical patent/ATE66061T1/en
Publication of EP0293332A2 publication Critical patent/EP0293332A2/en
Publication of EP0293332A3 publication Critical patent/EP0293332A3/en
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Publication of EP0293332B1 publication Critical patent/EP0293332B1/en
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    • 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

Definitions

  • the invention relates to a chimney cap with a pipe socket, an inner jacket arranged coaxially to the latter, at least approximately pyramid-frustum-shaped, which projects above the pipe socket, and an outer jacket arranged coaxially to the latter, projecting upwards from the inner jacket and distanced from it to form an annular chamber , whose upper outlet opening is covered by a cover part arranged at a distance above it.
  • the object of the present invention is to create a chimney cap by means of which raining or snowing into the chimney can be avoided in a simple and safe manner even in extreme wind conditions.
  • the flow guide part has a cylindrical shape, the cross section of the cylindrical part being at least approximately the same area as the cross section of the pipe socket and its lower inlet part being widened to the outside.
  • the lower extended entry part forces because of its larger Entry surface of the exhaust gases rising from the pipe socket into the subsequent cylindrical or polygonal flow guide part.
  • the lower extension ensures that rain falling from above does not get into the chimney interior and evaporate there, thereby generating cold, but is diverted to the outside.
  • the upper outlet opening of the inner jacket is at least approximately the same area as the cross section of the pipe socket.
  • the lower edge of the outer jacket is higher than the lower edge of the inner jacket and the height of the outer jacket is greater than the height of the inner jacket. It has proven to be expedient if the outer casing has at least approximately the shape of the casing of a truncated pyramid or a regular prism, preferably with eight side faces.
  • the inner casing also has at least approximately the shape of the casing of a truncated pyramid with eight side faces, and it is expedient if the angle of inclination of the side faces of the inner and outer casing are at least approximately the same size, the side edges of the inner and the outer shell preferably lie on the corresponding diameter planes.
  • the chimney cap shown therein is provided with a pipe socket 1 to be inserted into the chimney outlet opening, a truncated pyramid-shaped inner jacket 2 which projects above the pipe socket 1, and an inner jacket 2 arranged coaxially with the latter protruding upward and provided by this to form a bottom and top open annular chamber 3 outer jacket 4.
  • the upper outlet opening 5 of the outer jacket 4 is covered by a cover part 14, which is arranged at a distance above this opening 5 and is normally arranged in a hinged manner.
  • the outlet opening 6 of the inner casing 2 approximately the same area as the flow cross-section of the pipe socket 1.
  • the lower edge 7 of the outer casing 4 is higher than the lower edge 8 of the inner casing 2, and the height H A of the outer casing 4 is greater than the height H I of the inner casing 4.
  • the inner and outer sheaths 2 and 4 have 4 the shape of the shell of a truncated pyramid with eight flat side surfaces.
  • the inner and outer sheaths 2 and 4 are provided with inner beads 9, which run about 5 mm wide and run along the corner edges formed between its side faces 4 s , and which at the same time lead into the interior of the interior. respectively outer shell 2 or 4 form directed flow guide ribs 10, the height h of which increases towards the top.
  • angles of inclination ⁇ 1 and ⁇ 2 of the side surfaces of the inner and outer shells 2 and 4 are approximately the same size, the side edges of the inner and outer shells lying on corresponding diameter planes d.
  • the pipe socket 1 with a to rest on the Chimney crown certain cover and support plate 11 connected, which extends in a plane perpendicular to the longitudinal axis 12 of the top.
  • the lower edge 8 of the inner shell 2 extends down to just above the top of the cover and support plate 11.
  • the pipe socket 1 and the cover and support plate 11 are preferably made of a copper alloy and are connected to one another with good thermal conductivity. Furthermore, the pipe socket 1 is provided with thermal insulation 13 on its outside over its length extending above the cover and support plate 11.
  • the cover and support plate 11 is indirectly heated by the flue gas flowing through the pipe socket 1, so that any condensate dripping down from the inner jacket 2 onto the cover support plate 11 is evaporated there.
  • a cylindrical one that projects upwards, is arranged coaxially to the longitudinal axis 12 and extends along the latter
  • Flow guiding part 15 is provided, the lower inlet opening 16 of which is flanged or widened outwards and seen in the axial direction of the attachment, projects above the upper outlet opening 6 of the inner casing 2, so that liquid on the outside of the flow guiding part 15 drips onto the outside of the inner casing 2 and this prevents it from getting into the interior of the fireplace.
  • the size of the upper outlet opening 5 of the outer casing 4 is dimensioned such that the flow cross-section this outlet opening 5 is approximately 64% larger than the flow cross-section of the flow guide part 15 located in the same plane.
  • the flow guide tube 15 could also have the shape of a truncated cone shell which widens downward or some other suitable shape.
  • the radius of the inner circle of the base surface 17 or 18 of the inner and outer shell 2 or 4 should preferably be 1.45 to 1.55 times as large as the radius of the inner circle of the top surface 6 or 5 of the inner or outer shell.
  • the diameter of the inner circle of the base surface 17 of the inner jacket 2 is, for example, 27 cm and the diameter of the inner circle of the top surface 6 of the inner jacket 2 is, for example, 19.5 cm, that is to say the same as the diameter of the pipe socket 1, which is also 19.5 cm is.
  • the height H I of the inner jacket 2 is 17 cm.
  • the diameter of the cylindrical part of the flow guiding part 15 is also 19.5 cm, which means that this diameter is also identical to that of the pipe socket 1.
  • Figure 3 is a second embodiment with a Outer jacket 4 'shown, the horizontal cross section of which has the shape of a regular prism.
  • inner and / or outer jacket 2 or 4 or 4 ' can also be provided with openings.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chimneys And Flues (AREA)
  • Exhaust Silencers (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Ventilation (AREA)

Abstract

The chimney cowl is provided with a pipe connection piece (1), a truncated pyramid-shaped inner jacket (2) which projects upwards above the pipe connection piece (1), and a truncated pyramid-shaped outer jacket (4) which projects upwards above the inner jacket (2). The upper outlet opening (5) of the outer jacket is covered by a cover part (14) arranged above it. In order, even in the most extreme wind strengths and wind incidence directions, to prevent rain entering the chimney with pressure fluctuations in the outlet opening region of the chimney which are as small as possible and to improve the separation of the waste gas plume from the chimney cowl, there is arranged inside the upper part of the outer jacket (4) a cylindrical flow guide part (15) which projects upwards above the latter and is widened at the bottom. The lower inlet opening (16) of this part, which is widened downwards and outwards, projects beyond, seen in the axial direction of the cowl, the upper outlet opening (6) of the inner jacket (2) so that liquid condensing on this flow guide part (15) does not drip down into the chimney but onto the outside of the inner jacket (2) and evaporates there or on the cover and support plate (11) which is likewise heated. <IMAGE>

Description

Die Erfindung betrifft einen Schornsteinaufsatz mit einem Rohrstutzen, einem koaxial zu letzterem angeordneten, mindestens annähernd pyramiden-stumpfförmigen Innenmantel, der den Rohrstutzen nach oben überragt, sowie einem koaxial zu letzterem angeordneten, den Innenmantel nach oben überragenden und von diesem unter Bildung einer Ringkammer distanzierten Aussenmantel, dessen obere Austrittsöffnung von einem oberhalb dieser distanziert angeordneten Abdeckteil überdeckt ist.The invention relates to a chimney cap with a pipe socket, an inner jacket arranged coaxially to the latter, at least approximately pyramid-frustum-shaped, which projects above the pipe socket, and an outer jacket arranged coaxially to the latter, projecting upwards from the inner jacket and distanced from it to form an annular chamber , whose upper outlet opening is covered by a cover part arranged at a distance above it.

Es ist bekannt, zur Vermeidung des Hineinschneiens oder -regnens in einen Kamin diesen an seiner Austrittsmündung mit einem drehbaren Schornsteinaufsatz zu versehen. Solche Aufsätze weisen jedoch den grossen Nachteil auf, dass deren drehbarer Teil infolge Verschmutzung und/oder Festfrieren des an dieser Stelle entstehenden Kondensat bezüglich seiner Drehbarkeit blockiert oder zumindest stark gehemmt wird, und die Wirkung eines solchen Schornsteinaufsatzes damit sogar kontraproduktiv werden kann.It is known, in order to avoid snowing or raining into a chimney, to provide it with a rotatable chimney cap at its outlet mouth. However, such attachments have the major disadvantage that their rotatable part is blocked or at least strongly inhibited in terms of their rotatability due to soiling and / or freezing of the condensate formed at this point, and the effect of such a chimney attachment can thus even be counterproductive.

Es ist ferner auch bekannt, oberhalb der Austrittsmündung eines Kamins einen feststehenden Abdeckteil anzuordnen. Um den Zug im Kamin möglichst nicht negativ zu beeinflussen, muss ein solcher Abdeckteil genügend weit oberhalb der Kaminmündung angeordnet sein, was den Nachteil zur Folge hat, dass es bei extremen Windverhältnissen doch noch in den Kamin hineinregnen oder -schneien kann.It is also known to arrange a fixed cover part above the outlet mouth of a fireplace. In order not to negatively influence the draft in the chimney, such a cover part must be arranged sufficiently far above the chimney mouth, which has the disadvantage that it can still rain or snow into the chimney in extreme wind conditions.

Aufgabe der vorliegenden Erfindung ist die Schaffung eines Schornsteinaufsatzes mittels dem auch bei extremen Windverhältnissen auf einfache und sichere Weise ein Hineinregnen oder -schneien in den Kamin vermieden werden kann.The object of the present invention is to create a chimney cap by means of which raining or snowing into the chimney can be avoided in a simple and safe manner even in extreme wind conditions.

Diese Aufgabe wird bei einem Schornsteinaufsatz der eingangs genannten Art erfindungsgemäss dadurch gelöst, dass im Innern des Oberteils des Aussenmantels ein diesen nach oben überragender koaxial zur Aufsatzlängsachse angeordneter und längs dieser sich erstreckender rohrförmiger Strömungsführungsteil angeordnet ist, dessen untere Eintrittsöffnung in achsialer Richtung des Aufsatzes gesehen die obere Austrittsöffnung des Innenmantels in seitlicher Richtung überragt, und dessen obere Austrittsöffnung von der Unterseite des Abdeckteiles distanziert ist.This object is achieved according to the invention in a chimney cap of the type mentioned at the outset by the fact that in the interior of the upper part of the outer shell there is arranged a tubular flow guide part which projects upwards and extends coaxially with the longitudinal axis of the cap and whose lower inlet opening is seen in the axial direction of the cap The upper outlet opening of the inner jacket projects in the lateral direction, and the upper outlet opening is distanced from the underside of the cover part.

Dabei ist es zweckmässig, wenn der Strömungsführungsteil eine zylindrische Form aufweist, wobei der Querschnitt des zylindrischen Teiles mindestens annähernd flächengleich mit dem Querschnitt des Rohrstutzens und dessen unterer Eintrittsteil nach aussen erweitert ist.It is expedient if the flow guide part has a cylindrical shape, the cross section of the cylindrical part being at least approximately the same area as the cross section of the pipe socket and its lower inlet part being widened to the outside.

Der untere erweiterte Eintrittsteil zwingt wegen seiner grösseren Eintrittsfläche die aus dem Rohrstutzen aufsteigenden Abgase in den nachfolgenden zylindrischen oder im Querschnitt vieleckigen Strömungsführungsteil. Die untere Erweiterung bewirkt anderseits, dass von oben einschlagender Regen mit Sicherheit nicht in das Schornsteininnere gelangen und dort verdunsten und dadurch Kälte erzeugen kann, sondern nach aussen abgeleitet wird.The lower extended entry part forces because of its larger Entry surface of the exhaust gases rising from the pipe socket into the subsequent cylindrical or polygonal flow guide part. On the other hand, the lower extension ensures that rain falling from above does not get into the chimney interior and evaporate there, thereby generating cold, but is diverted to the outside.

Mit dieser Ausbildung wird durch die dadurch bewirkte leichte Zuganfachung die Bremswirkung des Abdeckteiles wieder aufgehoben, so dass trotz Umlenkung der Abgasströmung eine Verbesserung der Ablösung der Abgasfahne vom Schornsteinkopf aus Gründen des Umwelschutzes erreicht wird.With this design, the braking effect of the cover part is canceled again by the resulting slight train simplification, so that, despite deflection of the exhaust gas flow, an improvement in the detachment of the exhaust plume from the chimney head is achieved for reasons of environmental protection.

Um den Zug im Kamin nicht negativ zu beeinflussen, ist es zweckmässig, wenn die obere Austrittsöffnung des Innenmantels mindestens annähernd flächengleich mit dem Querschnitt des Rohrstutzens ist.In order not to negatively influence the draft in the chimney, it is expedient if the upper outlet opening of the inner jacket is at least approximately the same area as the cross section of the pipe socket.

Zur Erzielung möglichst stabiler Druckverhältnisse an der Schornsteinmündung selbst bei unterschiedlichsten Windanströmverhältnissen ist es vorteilhaft, wenn die Unterkante des Aussenmantels höher liegt als die Unterkante des Innenmantels und die Höhe des Aussenmantels grösser ist als die Höhe des Innenmantels. Dabei hat es sich als zweckmässig erwiesen, wenn der Aussenmantel mindestens annähernd die Form des Mantels eines Pyramidenstumpfes oder eines regulären Prismas, vorzugsweise mit acht Seitenflächen, aufweist. Dabei ist es vorteilhaft, wenn auch der Innenmantel mindestens annähernd die Form des Mantels eines Pyramidenstumpfes mit acht Seitenflächen aufweist, und es ist zweckmässig, wenn der Neigungswinkel der Seitenflächen des Innen-und des Aussenmantels mindestens annähernd gleich gross sind, wobei die Seitenkanten des Innen- sowie des Aussenmantels vorzugsweise auf jeweils korrespondierenden Durchmesserebenen liegen.In order to achieve the most stable possible pressure conditions at the chimney mouth, even with a wide variety of wind flow conditions, it is advantageous if the lower edge of the outer jacket is higher than the lower edge of the inner jacket and the height of the outer jacket is greater than the height of the inner jacket. It has proven to be expedient if the outer casing has at least approximately the shape of the casing of a truncated pyramid or a regular prism, preferably with eight side faces. It is advantageous if the inner casing also has at least approximately the shape of the casing of a truncated pyramid with eight side faces, and it is expedient if the angle of inclination of the side faces of the inner and outer casing are at least approximately the same size, the side edges of the inner and the outer shell preferably lie on the corresponding diameter planes.

Vorteilhafte Weiterausgestaltungen der Erfindung sind Gegenstand der Ansprüche 8 bis 15.Advantageous further developments of the invention are the subject of claims 8 to 15.

Nachstehend wird die Erfindung anhand der Zeichnung beispielsweise erläutert. Es zeigt:

Fig. 1
einen Längsschnitt durch eine erste beispielsweise Ausführungsform eines erfindungsgemässen Schornsteinaufsatzes;
Fig. 2
einen Schnitt längs der Linie II-II in Figur 1; und
Fig. 3
in kleinerem Massstab einen Längsschnitt durch eine zweite beispielsweise Ausführungsform eines erfindungsgemässen Schornsteinaufsatzes.

The invention is explained below using the drawing, for example. It shows:
Fig. 1
a longitudinal section through a first example embodiment of a chimney cap according to the invention;
Fig. 2
a section along the line II-II in Figure 1; and
Fig. 3
on a smaller scale, a longitudinal section through a second example embodiment of a chimney cap according to the invention.

Wie aus den Figuren 1 und 2 ersichtlich, ist der darin dargestellte Schornsteinaufsatz mit einem in die Kaminaustrittsmündung einzuführenden Rohrstutzen 1, einem koaxial zu diesem angeordneten pyramidenstumpfförmigen Innenmantel 2, der den Rohrstutzen 1 nach oben überragt, sowie einem koaxial zu letzterem angeordneten, den Innenmantel 2 nach oben überragenden und von diesem unter Bildung einer unten und oben offenen Ringkammer 3 distanzierten Aussenmantel 4 versehen.As can be seen from FIGS. 1 and 2, the chimney cap shown therein is provided with a pipe socket 1 to be inserted into the chimney outlet opening, a truncated pyramid-shaped inner jacket 2 which projects above the pipe socket 1, and an inner jacket 2 arranged coaxially with the latter protruding upward and provided by this to form a bottom and top open annular chamber 3 outer jacket 4.

Die obere Austrittsöffnung 5 des Aussenmantels 4 ist von einem oberhalb dieser Öffnung 5 distanziert angeordneten, normalerweise aufklappbar angeordneten Abdeckteil 14 überdeckt.The upper outlet opening 5 of the outer jacket 4 is covered by a cover part 14, which is arranged at a distance above this opening 5 and is normally arranged in a hinged manner.

Zur Vermeidung eines negativen Einflusses auf den Zug im Schornstein ist die Austrittsöffnung 6 des Innenmantels 2 etwa flächengleich mit dem Durchströmquerschnitt des Rohrstutzens 1.In order to avoid a negative influence on the draft in the chimney, the outlet opening 6 of the inner casing 2 approximately the same area as the flow cross-section of the pipe socket 1.

Zur Erzielung möglichst stabiler Druckverhältnisse im Mündungsbereich des Schornsteines liegt die Unterkante 7 des Aussenmantels 4 höher als die Unterkante 8 des Innenmantels 2, und die Höhe HA des Aussenmantels 4 ist grösser als die Höhe HI des Innenmantels 4.In order to achieve the most stable possible pressure conditions in the mouth area of the chimney, the lower edge 7 of the outer casing 4 is higher than the lower edge 8 of the inner casing 2, and the height H A of the outer casing 4 is greater than the height H I of the inner casing 4.

Um zu vermeiden, dass bei einer seitlichen Anströmung des Innen- und des Aussenmantels 2 bzw. 4 durch Wind die derart erzeugte Strömung sich um diese beiden Mäntel anlegt und über deren Umfang betrachtet recht unterschiedliche Druckverhältnisse bewirkt, weisen der Innen- und der Aussenmantel 2 bzw. 4 die Form des Mantels eines Pyramidenstumpfes mit acht ebenen Seitenflächen auf.In order to prevent the flow generated in this way from settling around these two sheaths and causing quite different pressure ratios over their circumference when the air flows in from the side of the inner and outer sheaths 2 and 4, the inner and outer sheaths 2 and 4 have 4 the shape of the shell of a truncated pyramid with eight flat side surfaces.

Zur Bildung weiterer die Erzeugung von Turbulenz und Strömungsabrissen fördernder Elemente ist der Innen- und der Aussenmantel 2 bzw. 4 mit längs der zwischen seinen Seitenflächen 4s gebildeten Eckkanten verlaufenden, etwa 5 mm breiten Innensicken 9 versehen, die gleichzeitig in das Innere des Innen- respektive Aussenmantels 2 respektive 4 gerichtete Strömungsführungsrippen 10 bilden, deren Höhe h gegen oben zunimmt.In order to form further elements which promote the generation of turbulence and stall, the inner and outer sheaths 2 and 4 are provided with inner beads 9, which run about 5 mm wide and run along the corner edges formed between its side faces 4 s , and which at the same time lead into the interior of the interior. respectively outer shell 2 or 4 form directed flow guide ribs 10, the height h of which increases towards the top.

Die Neigungswinkel α₁ respektive α₂ der Seitenflächen des Innen- und des Aussenmantels 2 respektive 4 sind etwa gleich gross, wobei die Seitenkanten des Innen- und des Aussenmantels auf jeweils korrespondierenden Durchmesserebenen d liegen.The angles of inclination α₁ and α₂ of the side surfaces of the inner and outer shells 2 and 4 are approximately the same size, the side edges of the inner and outer shells lying on corresponding diameter planes d.

Ferner ist der Rohrstutzen 1 mit einer zur Auflage auf der Schornsteinkrone bestimmten Abdeck- und Tragplatte 11 verbunden, welche sich in einer senkrecht zur Aufsatzlängsachse 12 verlaufenden Ebene erstreckt. Die Unterkante 8 des Innenmantels 2 erstreckt sich bis unmittelbar oberhalb der Oberseite der Abdeck- und Tragplatte 11 hinunter.Furthermore, the pipe socket 1 with a to rest on the Chimney crown certain cover and support plate 11 connected, which extends in a plane perpendicular to the longitudinal axis 12 of the top. The lower edge 8 of the inner shell 2 extends down to just above the top of the cover and support plate 11.

Der Rohrstutzen 1 sowie die Abdeck- und Tragplatte 11 bestehen vorzugsweise aus einer Kupferlegierung und sind gut wärmeleitend miteinander verbunden. Ferner ist der Rohrstutzen 1 über seine oberhalb der Abdeck- und Tragplatte 11 sich erstreckende Länge auf seiner Aussenseite mit einer Wärmeisolierung 13 versehen.The pipe socket 1 and the cover and support plate 11 are preferably made of a copper alloy and are connected to one another with good thermal conductivity. Furthermore, the pipe socket 1 is provided with thermal insulation 13 on its outside over its length extending above the cover and support plate 11.

Auf diese Weise wird die Abdeck- und Tragplatte 11 indirekt durch das durch den Rohrstutzen 1 hindurchströmende Rauchgas beheizt, so dass allfälliges vom Innenmantel 2 auf die Abdeck- Tragplatte 11 hinuntertropfendes Kondensat dort zum Verdunsten gebracht wird.In this way, the cover and support plate 11 is indirectly heated by the flue gas flowing through the pipe socket 1, so that any condensate dripping down from the inner jacket 2 onto the cover support plate 11 is evaporated there.

Um nun absolut sicher zu vermeiden, dass selbst bei extremsten Windverhältnissen kein Regen in das Kamin gelangt, wird nun auf Grund von eingehenden Strömungsuntersuchungen im Innern des Oberteiles des Aussenmantels 4 ein diesen nach oben überragender, koaxial zur Aufsatzlängsachse 12 angeordneter und längs dieser sich erstreckender zylindrischer Strömungsführungsteil 15 vorgesehen, dessen untere Eintrittsöffnung 16 nach aussen umgebördelt bzw. erweitert ist und in achsialer Richtung des Aufsatzes gesehen die obere Austrittsöffnung 6 des Innenmantels 2 überragt, so dass auf der Aussenseite des Strömungsführungsteiles 15 sich niederschlagende Flüssigkeit auf die Aussenseite des Innenmantels 2 abtropft und dadurch nicht in das Kamininnere gelangt.In order to absolutely absolutely avoid that no rain gets into the chimney, even in the most extreme wind conditions, due to detailed flow investigations inside the upper part of the outer casing 4, a cylindrical one that projects upwards, is arranged coaxially to the longitudinal axis 12 and extends along the latter Flow guiding part 15 is provided, the lower inlet opening 16 of which is flanged or widened outwards and seen in the axial direction of the attachment, projects above the upper outlet opening 6 of the inner casing 2, so that liquid on the outside of the flow guiding part 15 drips onto the outside of the inner casing 2 and this prevents it from getting into the interior of the fireplace.

Die Grösse der oberen Austrittsöffnung 5 des Aussenmantels 4 ist dabei derart bemessen, dass der Durchströmquerschnitt dieser Austrittsöffnung 5 etwa 64% grösser ist als der in der gleichen Ebene sich befindende Durchströmquerschnitt des Strömungsführungsteiles 15.The size of the upper outlet opening 5 of the outer casing 4 is dimensioned such that the flow cross-section this outlet opening 5 is approximately 64% larger than the flow cross-section of the flow guide part 15 located in the same plane.

Selbstverständlich könnte das Strömungsführungsrohr 15 auch die Form eines nach unten sich erweiternden Kegelstumpfmantels oder eine andere geeignete Form aufweisen.Of course, the flow guide tube 15 could also have the shape of a truncated cone shell which widens downward or some other suitable shape.

Eingehende Strömungsuntersuchungen haben ergeben, dass zur Erzielung möglichst optimaler konstanter Druckverhältnisse im Kamin folgende Bemessungsverhältnisse eingehalten werden sollten:In-depth flow studies have shown that the following design ratios should be adhered to in order to achieve the best possible constant pressure conditions in the chimney:

Der Radius des Innenkreises der Grundfläche 17 respektive 18 des Innen- und des Aussenmantels 2 respektive 4 sollte vorzugsweise 1,45 bis 1,55 mal so gross sein wie der Radius des Innenkreises der Deckfläche 6 respektive 5 des Innen- respektive Aussenmantels. Im dargestellten Ausführungsbeispiel beträgt der Durchmesser des Innenkreises der Grundfläche 17 des Innenmantels 2 beispielsweise 27 cm und der Durchmesser des Innenkreises der Deckfläche 6 des Innenmantels 2 beispielsweise 19,5 cm, das heisst gleichviel wie der Durchmesser des Rohrstutzens 1, der ebenfalls 19,5 cm beträgt. Die Höhe HI des Innenmantels 2 beträgt 17 cm.The radius of the inner circle of the base surface 17 or 18 of the inner and outer shell 2 or 4 should preferably be 1.45 to 1.55 times as large as the radius of the inner circle of the top surface 6 or 5 of the inner or outer shell. In the illustrated embodiment, the diameter of the inner circle of the base surface 17 of the inner jacket 2 is, for example, 27 cm and the diameter of the inner circle of the top surface 6 of the inner jacket 2 is, for example, 19.5 cm, that is to say the same as the diameter of the pipe socket 1, which is also 19.5 cm is. The height H I of the inner jacket 2 is 17 cm.

Der Durchmesser des zylindrischen Teiles des Strömungsführungsteiles 15 beträgt ebenfalls 19,5 cm, das heisst dieser Durchmesser ist ebenfalls identisch mit demjenigen des Rohrstutzens 1.The diameter of the cylindrical part of the flow guiding part 15 is also 19.5 cm, which means that this diameter is also identical to that of the pipe socket 1.

Die übrigen Bemessungskriterien können den Ansprüchen 10 bis 14 entnommen werden.The other design criteria can be found in claims 10 to 14.

In Figur 3 ist ein zweites Ausführungsbeispiel mit einem Aussenmantel 4′ dargestellt, dessen horizontaler Querschnitt die Form eines regulären Prismas aufweist.In Figure 3 is a second embodiment with a Outer jacket 4 'shown, the horizontal cross section of which has the shape of a regular prism.

Zu dem in den Figuren 1 und 2 dargestellten ersten Ausführungsbeispiel analoge Teile sind mit den gleichen Überweisungszeichen versehen, so dass sich eine nochmalige Beschreibung dieser analogen Teile erübrigt.Parts analogous to the first exemplary embodiment shown in FIGS. 1 and 2 are provided with the same reference symbols, so that a repeated description of these analog parts is unnecessary.

Selbstverständlich kann der Innen- und/oder der Aussenmantel 2 respektive 4 beziehungsweise 4′ zusätzlich mit Öffnungen versehen sein.Of course, the inner and / or outer jacket 2 or 4 or 4 'can also be provided with openings.

Claims (15)

1. Chimney cowl having a pipe socket, an at least approximately truncated pyramid-shaped inner jacket (2) which is arranged coaxially with respect to the pipe socket (1) and projects upwards beyond it, and an outer jacket (4) arranged coaxially with respect to the inner jacket (2) and spaced therefrom to form an annular chamber (3), the upper outlet opening (5) of the outer jacket (4) being covered by a cover part (14) arranged spaced above it, characterized in that there is arranged in the interior of the upper part of the outer jacket (4) a tubular flow-guiding part (15) extending through the upper outlet opening (5) of the outer jacket (4), projecting upwards beyond the outer jacket (4), arranged coaxially with respect to the longitudinal axis (12) of the cowl and extending along this longitudinal axis (12), the lower inlet opening (16) of this flow-guiding part (15) projecting, as seen in the axial direction of the cowl, beyond the upper outlet opening (6) of the inner jacket (2) in the lateral direction, and the upper outlet opening (17) of this flow-guiding part (15) being spaced from the underside of the cover part (14), and the cross-section of throughflow (DA) of the upper outlet opening (5) of the outer jacket (4) being, as seen in the plane of the upper outlet opening (5) of the outer jacket (4), at least 40% larger than the cross-section of throughflow (Ds) of the flow-guiding part (15), located in the same plane.
2. Chimney cowl according to Claim 1, characterized in that the flow-guiding part (15) has a cylindrical shape, the cross-section of the cylindrical part (15′) having at least approximately the same area as the cross-section of the pipe socket (1) and its lower inlet part (15˝) being widened outwards.
3. Chimney cowl according to Claim 1 or 2, characterized in that the upper outlet opening (6) of the inner jacket (2) has at least approximately the same area as the cross-section of the pipe socket (1).
4. Chimney cowl according to one of Claims 1 to 3, characterised in that the underside (7) of the outer jacket (4) is higher up than the underside (8) of the inner jacket (2), and the height (HA) of the outer jacket (4) is greater than the height (HI) of the inner jacket (4).
5. Chimney cowl according to one of Claims 1 to 4, characterized in that the outer jacket (4) has at least approximately the shape of the surface of a truncated pyramid or of a regular prism preferably having eight side faces.
6. Chimney cowl according to one of Claims 1 to 5, characterized in that the inner jacket (2) has at least approximately the shape of the surface of a truncated pyramid having eight side faces.
7. Chimney cowl according to Claims 5 and 6, characterized in that angles of inclination of the side faces of the inner and the outer jackets (2, 4) are at least approximately the same size, the side edges of the inner and of the outer jackets preferably lying along respectively corresponding diametral planes (d).
8. Chimney cowl according to one of Claims 1 to 7, characterized in that the pipe socket (1) is connected to a cover and carrying plate (11) intended for the chimney cap to bear upon and extending in a plane running perpendicular to the longitudinal axis (12) of the cowl, and in that the underside (8) of the inner jacket (2) extends at least approximately down as far as the upper side of the cover and carrying plate (11).
9. Chimney cowl according to Claim 8, characterized in that the pipe socket (1) and the cover and carrying plate (11) comprise metal, preferably a copper alloy, and are connected to one another in a manner which conducts heat well, and in that the pipe socket (1) is provided with a heat insulation (13) on its outside over its length extending above the cover and carrying plate (11).
10. Chimney cowl according to one of Claims 1 to 9, characterized in that the radius of the inner circle of the base surface of the inner and/or outer jacket (2 and 4 respectively) is 1.35 to 1.65 times, preferably 1.45 to 1.55 times, as large as the radius of the inner circle of the cover face of the inner or outer jacket respectively (2, 4).
11. Chimney cowl according to one of Claims 1 to 10, characterized in that the cross-section of throughflow of the upper outlet opening (5) of the outer jacket (4) is 1.5 to 1.8; preferably 1.6 to 1.7, times as large as the smallest cross-section of throughflow of the flow-guiding part (15) or the cross-section of throughflow of the pipe socket (1).
12. Chimney cowl accoridng to one of Claims 1 to 11, characterized in that the internal diameter of the flow-guiding part (15) corresponds to 1.0 to 1.3 times, preferably 1.0 to 1.1 times, the internal diameter of the pipe socket (1).
13. Chimney cowl according to one of Claims 1 to 12, characterized in that the height (Hs) of the flow-guiding part (15) corresponds to 0.2 to 0.4 times, preferably 0.25 to 0.29 times, the height (HA) of the outer jacket (4), in that the outlet side (17) of the flow-guiding part (15) projects above the outlet opening (5) of the outer jacket (4) in the axial direction by a distance (a) which corresponds to 0.06 to 0.1 times, preferably 0.07 to 0.09 times, the internal diameter of the pipe socket (1), the cover part (14) is arranged above the outlet opening (5) of the outer jacket (4) in the axial direction by a spacing (b) which corresponds to 0.22 to 0.5 times, preferably 0.35 to 0.42 times, the internal diameter of the pipe socket (1), and the cover part (14), as seen in outline, projects over the outlet opening (5) of the outer jacket (4).
14. Chimney cowl according to one of Claims 1 to 13, characterized in that the spacing (c) between the lower inlet opening (16) of the flow-guiding part (15) and the upper outlet opening (6) of the inner jacket (2) is in a range from 0.25 to 0.5 times, preferably in a range from 0.3 to 0.4 times, the smallest internal diameter of the flow-guiding part (15).
15. Chimney cowl according to one of Claims 1 to 14, characterized in that the inner and/or the outer jacket (2 and 4 respectively) is provided with internal beading (9) running along the corner edges formed between its side faces (4s) and preferably at least 4 mm wide, and which at the same time form ribs (10) directed towards the interior of the inner or outer jacket respectively, the height (h) of these ribs preferably increasing towards the top.
EP88810350A 1987-05-27 1988-05-27 Chimney cowl Expired - Lifetime EP0293332B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810350T ATE66061T1 (en) 1987-05-27 1988-05-27 CHIMNEY TOP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2047/87A CH676018A5 (en) 1987-05-27 1987-05-27
CH2047/87 1987-05-27

Publications (3)

Publication Number Publication Date
EP0293332A2 EP0293332A2 (en) 1988-11-30
EP0293332A3 EP0293332A3 (en) 1989-03-29
EP0293332B1 true EP0293332B1 (en) 1991-08-07

Family

ID=4224695

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810350A Expired - Lifetime EP0293332B1 (en) 1987-05-27 1988-05-27 Chimney cowl

Country Status (4)

Country Link
EP (1) EP0293332B1 (en)
AT (1) ATE66061T1 (en)
CH (1) CH676018A5 (en)
DE (1) DE3864081D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100460759C (en) * 2004-03-10 2009-02-11 沈阳戴维环保节能设备有限公司 Wind-proof, rain-proof and environmental protection cowl
CN102817461B (en) * 2012-06-06 2015-04-29 王东明 Self-changing pressure exhaust channel of branching air channel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191312719A (en) * 1913-05-31 1914-03-26 William Cairns Improvements in or relating to Chimney and Ventilating Shaft Tops.
US1406321A (en) * 1914-09-14 1922-02-14 Harmon J Yeldham Ventilator
US1346633A (en) * 1919-09-29 1920-07-13 Oscar E Cloud Ventilator
US2188564A (en) * 1939-02-08 1940-01-30 Floyd F Schultz Draft regulator for chimneys
CH615495A5 (en) * 1977-08-05 1980-01-31 Paul Henriod Chimney cowl
DE3237216C2 (en) * 1982-10-07 1986-09-25 Inventina AG, Landquart Chimney top for central heating systems with atomizing burners
DE8511683U1 (en) * 1985-04-19 1985-07-04 Live GmbH, 5401 St Goar Chimney top

Also Published As

Publication number Publication date
ATE66061T1 (en) 1991-08-15
EP0293332A3 (en) 1989-03-29
DE3864081D1 (en) 1991-09-12
EP0293332A2 (en) 1988-11-30
CH676018A5 (en) 1990-11-30

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