EP1450101A1 - Terminal duct for balanced flue - Google Patents

Abstract

The device has an internal tube (2) extending upwards to form an exit unit (3), and an external tube (4) surrounding the tube (2). An entrance unit (5) of combustion air is found below and at a distance from the exit unit. The unit (5) is on the periphery of tube (4) such that an upper part of an annular space forms an insulating compartment when a lower part forms a pipe transporting the combustion air towards a heating device.

Description

The present invention relates to a termination device for double wall smoke.

A double-walled flue is intended to evacuate the combustion gases, on the one hand, and to supply combustion air, on the other hand, one or more heating said to be sealed combustion, with liquid or gaseous fuel.

A so-called sealed combustion heater does not draw air from its direct environment but at a distance from where it is installed. The air is generally taken near the place, for example the exterior of a building, where the fumes produced by combustion can be exhausted. That’s why he has been proposed, in the case of heaters with remote combustion air source to use a double walled pipe with concentric pipes in which a pipe inside conveys the smoke to be evacuated and an outside pipe conveys the combustion air to the heater using the annular space between the walls of the pipe inside and outside pipe.

Today's double-walled flues are designed to so that a termination part is, for example, on the roof of a building extends vertically, the inner pipe leading upwards to allow the evacuation of combustion gases. The outer pipe also opens upwards, but its opening is below the opening of the pipe outside, so that the annular space forming the air intake opening is in below the opening of the inner pipe forming a gas exhaust port combustion. The flue generally includes a protective cap installed above the opening of the inner pipe, so as to protect this opening while allowing the evacuation of combustion gases. The smoke flue may also include a bell attached above the pipe opening outside so that the air sucked in through the annular opening between the inner pipe and the outside pipe enters from below the bell.

A first problem posed by known double-walled flues comes from the fact that the combustion gas discharged upwards through the opening of the pipe interior can nevertheless mix with the aspirated oxidant gas. This mixture can occur even if the oxidant gas is sucked under a bell.

A second problem with known double-walled flues comes from the fact that the humidity present in the relatively hot gases evacuated by the inner pipe can condense and freeze when these gases are suddenly cooled when arriving outside. When the temperature is low, a heap of ice can form on the duct. On the one hand, such a mass of ice can hinder the operation of the duct, for example by preventing air from entering the duct, and, on the other hand, create other problems like falling ice.

The present invention particularly relates to a double flue wall to solve the problems that have just been mentioned.

The present invention relates to a flue termination device double-walled heater, said flue comprising a inner pipe conveying the smoke to be evacuated and an outer pipe conveying air oxidizer to the heater using the annular space between the walls inner pipe and outer pipe, characterized in that said device termination includes an inner pipe and an outer concentric pipe, respectively extending said inner pipe and said outer pipe of said conduit, in that said inner pipe opens upwards so that its end upper form of smoke outlet, in that said outer pipe surrounds said inner pipe over substantially the entire height of the latter, and in that a combustion air inlet means is provided on the periphery of said external pipe to a height such that said air inlet means is below and at a distance of said smoke outlet means.

The distance between the air intake and smoke outlet means being the most significant possible, the risks of mixing between the gas flows are greatly limited combustion and combustion air. Since, on the other hand, the outer pipe continues to surround the inner pipe above the air inlet means until smoke outlet means, the annular space between the walls of these pipes can serve as an insulating compartment allowing thermal insulation of the internal duct outside air.

Advantageously, a crown obstructs the annular space between said inner and outer pipes above said combustion air inlet means.

This crown or obturation ring allows the air flow to be directed downwards and to avoid air rises.

Advantageously, a first bell element obstructs the space annular between said inner and outer pipes at the upper end of said outer pipe.

Advantageously, said first bell element is fixed by interlocking with said inner pipe.

Advantageously, said first bell element is fixed by crimping simultaneous of its wall and the wall of said inner pipe.

Advantageously, the annular space between said interior and exterior pipes is filled with thermal insulation in an area starting above said means combustion air inlet and going to its upper end.

Advantageously, said air inlet means consists of a plurality of holes made on the periphery of said outer pipe.

Advantageously, a second bell element is fixed by its upper part at the periphery of said outer pipe, just above said air inlet means, so that said second bell member extends around the outer pipe in look of said air inlet means.

Thus, the air inlet means is protected, the air sucked in by the inlet means of air entering from below the bell.

Advantageously, said second bell element is fitted onto said pipe outside.

Advantageously, said second bell element is fixed by crimping simultaneous of its wall and the wall of said outer pipe.

According to another aspect of the present invention, said smoke outlet means is surmounted by a means forming an anti-refoulement cap comprising a ferrule surrounding said smoke outlet means and a helmet disposed above said ferrule so that smoke escapes between the upper end of said ferrule and the periphery of said helmet.

Advantageously, said helmet comprises a lower wall of shape tapered tapering towards the bottom which is opposite said outlet means fumes.

Advantageously, a frustoconical wall narrowing upwards is formed around the upper part of said inner tube, the angle of inclination of this wall being opposite the angle of inclination of said lower shaped wall frustoconical of said helmet.

The arrangement of these two frustoconical walls which intervene on both sides and on the other side of the shell, makes it possible to form an aerodynamic assembly facilitating the exit fumes while preventing them from going down into the flue discharge chimney.

Advantageously, said helmet consists of an upper wall and a lower wall, an empty compartment or filled with thermal insulation being provided between these two walls.

This insulating compartment helps prevent condensation from forming under the hat helmet.

Advantageously, said helmet is of a size such that the periphery of said helmet constitutes the part of said termination device furthest from the axis of said termination device.

Thus, the condensation droplets that can eventually form at the level of the periphery of the helmet or drops of water from rainwater falling on the top of the helmet are far enough away from the areas that should be protect from possible ice formation.

la Fig. 1 représente une vue en perspective avec arrachement en demi-coupe longitudinale d'un dispositif de terminaison selon l'invention ;

la Fig. 2 représente une vue partielle à plus grande échelle du dispositif de terminaison de la Fig. 1, montrant une partie supérieure de ce dispositif de terminaison avant fixation d'une cloche supérieure par expansion du tuyau intérieur ;

la Fig. 2 bis représente une vue similaire à celle de la Fig. 2 montrant la partie supérieure du dispositif de terminaison après fixation d'une cloche supérieure par expansion du tuyau intérieur ;

la Fig. 3 représente une vue partielle à plus grande échelle du dispositif de terminaison de la Fig. 1, montrant un ensemble d'éléments formant chapeau anti-refouleur de ce dispositif de terminaison ;

la Fig. 4 représente une vue globale des dispositifs des Figs. 2bis et 3 montés l'un sur l' autre ; et

la Fig. 5 représente une vue en élévation de côté du dispositif de terminaison de la Fig. 1 monté sur le toit d'un bâtiment.

The characteristics of the invention mentioned above as well as others will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the accompanying drawings, among which:

Fig. 1 shows a perspective view with cutaway in longitudinal half-section of a termination device according to the invention;

Fig. 2 shows a partial view on a larger scale of the termination device of FIG. 1, showing an upper part of this termination device before fixing an upper bell by expansion of the inner pipe;

Fig. 2 bis represents a view similar to that of FIG. 2 showing the upper part of the termination device after fixing an upper bell by expansion of the inner pipe;

Fig. 3 shows a partial view on a larger scale of the termination device of FIG. 1, showing a set of elements forming a backflow preventer cap of this termination device;

Fig. 4 shows an overall view of the devices of FIGS. 2bis and 3 mounted one on the other; and

Fig. 5 shows a side elevation view of the termination device of FIG. 1 mounted on the roof of a building.

In the embodiment shown in Figs. 1 to 5, the present invention applies to a double-walled flue for a space heater distant combustion air source combustion. Such a conduit includes a hose interior conveying smoke to the exterior of a building, the air intended to supply the heater circulating from the outside of the building to the heater heating, in the annular space created between the inner pipe and the outer pipe. Generally, such a conduit is made up of several conduit elements placed end to end. end. The present invention relates to the terminal duct element, a part of which provided with smoke outlet and combustion air inlet means is located outside the building.

With reference to FIG. 1, a terminal duct element 1 comprises overall an inner pipe 2 open at its upper end forming means of smoke outlet 3, an outer coaxial pipe 4 provided with an air inlet means 5 located in an air intake area located some distance below the smoke outlet zone, a bell 6 fixed to the periphery of the outer pipe 4 at the level of the air intake zone, a bell 16 fixed to the periphery of the inner pipe to close the gap between the interior and exterior pipes from above, and a set 8 covering the smoke outlet zone forming an anti-repression cap consisting of a ferrule 33 surmounted by a helmet 35.

The inner 2 and outer 4 pipes are each of generally cylindrical shape circular. The outer pipe 4 has a diameter greater than the diameter of the pipe interior 2 so as to leave an annular space 9 between the interior pipe 2 and the external pipe 4 sufficient to allow the supply of combustion air to the heater.

As can be seen in FIG. 1, the inner pipe 2 is longer than the outer pipe 4 and exceeds the latter in the lower part of the terminal duct element 1 which facilitates the nesting of the latter on the flue. This pipe interior 2 includes at its lower end a re-entrant edge 21. The end upper of the inner pipe 2 opening upwards forms the exit zone of the smoke 3.

The outer pipe 4 has a tuck-in edge 10 at its lower end. above which is a rod 11 projecting outwards. This rod 11 is intended to serve as a support on which comes the upper end of the outer pipe of the flue, the part located between the rod 11 and the inside edge 10 being adapted to come and fit into this outside pipe of the flue. Two ways to fixing with nuts 7 crimped at the same height, diametrically opposite, on the pipe 4 allow the terminal duct element 1 to be fixed to a roof flashing 45, as can be seen in FIG. 5.

A combustion air inlet means 5 consists of a plurality of holes formed around the outer pipe 4. This set of peripheral holes defines an air intake means or air intake 5 which is at a certain distance from the upper end of the terminal duct element 1. This distance is provided so that the air inlet zone 5 is as far as possible from the air outlet zone fumes 3. As can be seen in FIG. 5, when the terminal duct element 1 is mounted on the roof of a building, passing through a frustoconical skirt 48 of a flashing of roof 45, the air inlet zone 5 is located near the upper end of the frustoconical skirt 48, in the lowest possible position allowing a outside air intake.

Above the combustion air inlet means 5 is formed a rod in indentation inwards 12. This rod 12 has two functions. First of all, it is used for crimping the bell 6 on the outer pipe 4 as will be seen later. Then, it serves as a support for a crown 19 allowing the obturation of the space annular 9 above the combustion air inlet means 5.

On the upper part of the pipe 4 is formed a rod projecting outwards serving as a support for the bell 16 adapted to obstruct the annular space 9 between the interior and exterior pipes above the exterior pipe.

Advantageously, the annular space 9 between the interior and exterior pipes is filled with thermal insulation in the area between the ring 19 and the end top of the outer pipe 4 covered by the bell 16.

The bell 6 comprises at its top a first cylindrical part of diameter slightly greater than the diameter of the outer pipe 4 so as to allow a nesting of the bell on the latter then, downwards, a flare of frustoconical shape 14 then a second cylindrical part 15 on which is formed a recessed inward rush to prevent the intrusion of volatile in the air intake means and stiffen the bell at its low end. The upper cylindrical part allows, as described below, fixing the bell to the periphery of the outer pipe, just above the air intake zone, so that the second cylindrical part 15 extends around the outer pipe opposite the air inlet holes 5, at a sufficient distance to allow the passage of air under the bell.

The fixing of the bell 6 on the outer pipe is done by fitting the pipe outside 4 in the bell 6 so that the outside wall of the pipe is pressed against the inner surface of the upper cylindrical part of the bell, then by crimping of this cylindrical part in the rod 12. The crimping is carried out at the by means of a tube crimping device adapted to surround the pipe.

As can be seen in FIG. 2, the bell 16 includes at its top a first cylindrical part 20 of diameter slightly greater than the diameter of the pipe interior 2 so as to allow the bell to fit on the latter, then, downwards, a tapered flare 18 then a second cylindrical part 17 which rests on the rod 13 of the outer pipe. The upward tilt of the wall 18 contributes to improving the aerodynamic performance of the anti-repressor cap.

The fixing of the bell 16 on the inner pipe is done by fitting the inner pipe 2 in the bell 16 so that the outer wall of the pipe is pressed against the inner surface of the cylindrical part 20, then by expansion of the pipe inside. The expansion is carried out by means of a tube expansion device that we introduce into the pipe. Fig. 2 shows the assembly of the inner pipe and the bell before expansion and FIG. 2bis shows this assembly after expansion. So as seen in Fig. 2bis, after expansion, the inner pipe 2 comprises from above at the bottom a first flared edge 25 towards the outside then a cylindrical part 26 more large diameter as this same part before expansion then a part projecting towards the outside internally forming a trapezoidal groove 27. The deformation of the pipe interior 2 causes a corresponding deformation of the cylindrical part 20 of the bell 16, so that a mechanical key is formed between the inner pipe 2 and the bell 16 for fixing the latter.

The assembly covering the smoke outlet zone forms an anti-repression cap. With reference to FIG. 3, this hat generally comprises a cylinder of attachment 28, a ferrule 33 surrounding the smoke outlet zone and a helmet cap 35 disposed above said ferrule so that the smoke escapes between the upper end of said shell and the periphery of said helmet, the assembly being kept coherent by means of connecting lugs 32 welded to these different elements.

The cylinder 28 has a diameter substantially smaller than the diameter of the part upper inner pipe 2 after expansion which allows the nesting of the cylinder in this pipe. It is of course open, in practice extending the pipe interior 2 so as to let out the fumes at its end higher. The lower end of the cylinder 28 is provided with an edge returning towards the interior 29 while at the level of the upper end of this cylinder is formed an outwardly projecting rod 30 intended to bear on the flared edge 25 of the upper end of the inner pipe 2. In addition, a fixing lug by clipping 24 is provided on this cylinder 28, this tab being intended to come into engagement with the trapezoidal groove 27 of the inner pipe 2. The rod 30 resting on the edge flared 25 and the tab 24 in engagement with the trapezoidal groove 27 constitute a key mechanical immobilizing the backflow preventer cap on the inner pipe. For dismantle the backflow preventer cap, you must push back the tab 24 which is possible at using an elongated object such as a screwdriver inserted through a hole 23 provided for this purpose on the upper part of the bell 16, at the level of the groove trapezoidal 27, as can be seen in FIG. 2a.

On the inner walls of the cylinder 28, at the upper end of the latter, are welded the connecting lugs 32 previously formed so as to serve as a spacer between the cylinder 28 and the ferrule 33.

The ferrule 33 is cylindrical in shape and extends along the axis of the assembly of the terminal duct element 1. It has a diameter slightly greater than the outer diameter of the bell 16 and therefore the diameter of the outer pipe 4. Rods 42 are formed at a lower part and an upper part of ferrule 33. These rods project outward. The ferrule 33 surrounds the orifice of smoke outlet, the upper end of the cylinder 28 lying between the two rods 42, slightly closer to the lower rod. The connecting lugs 32, coming from the cylinder 28, go up along the inner wall of the shell to which they are welded. This ferrule forms the body of the anti-refoulement hat. She is notably intended to protect the exit of fumes from gusts of wind and rain entries in the inner pipe 2.

The helmet 35 is composed of a lower part and an upper part assembled by spot welding. The lower part 34 comprises, from the center towards the periphery, a horizontal flat 39, a frustoconical part 38 inclined upwards then, at the periphery, a flat edge 37 slightly inclined downward forming a drop of water. The upper part 36 is a disc whose periphery follows the falling edge of the lower part 34.

The frustoconical part 38 describes an angle identical to that described by the part frustoconical 18 of the bell 16 in the opposite direction. These two frustoconical parts opposite associated with the shell 33 form an aerodynamic assembly facilitating the smoke outlet while preventing the latter from descending into the flue discharge chimney.

Between the two parts 34 and 36 is provided an empty or filled compartment 40 thermal insulation. This insulating compartment helps prevent the formation of condensation under the helmet of the hat.

The helmet 35 is held above the shell 33 by means of the tabs 32 welded to the periphery of the frustoconical part 38. The diameter of this helmet is greater than the diameter of the bell 6 so as to move the assembly away from the leads the rainwater falling on the upper part of this helmet.

For a better understanding, the devices described in Figs. 2bis and Fig. 3 are shown assembled in FIG. 4. In this Fig., We notice that the flared edge 25 comes into contact with the rod 30 and the tab 24 snaps into the trapezoidal groove 27. Thus, the ferrule 33 is securely linked to the bell 16.

Fig. 5 shows the installation of the terminal duct element 1 associated with a sealing device on the roof of a building. A waterproof crossing system of roof 44 comprises a roof flashing 45 formed by a base plate 46 fitted a flexible or malleable flap 47 at its lower part then a frustoconical skirt 48 welded to the base plate 46, a rod 52 inwardly recessed and two legs 49 located opposite one another on either side of the part upper part of the frustoconical skirt, these tabs each being pierced with an orifice 50.

The orifices 50 allow the duct element to be fixed by screwing terminal 1 by means of the nuts 7 of this element 1. This fixing system allows an angular adjustment according to the different slopes of the roof, the final blocking of the conduit element being ensured during the nesting of the conduit elements lower. The angular adjustment of the flashing 45 is carried out by pivoting the skirt frustoconical 48 around the axis of the orifice 50 which is located in a plane parallel to that of the roof and in a direction perpendicular to the direction of greatest slope of the roof. Thus, the flashing 45 takes place on the roof in an adjusted manner.

Above the flashing 45, a drip 51 forming a discharge of water is clamped on the body of the terminal duct element between the flashing 45 and the air intake bell 6. This drip 51 prevents the entry of water or volatiles inside the flashing 45.

Claims (18)

Double-walled flue termination device for a heating appliance, comprising an inner pipe (2) and an outer pipe (4) concentric forming between them an annular space (9), said inner pipe opening upwards so that its upper end forms a smoke outlet means (3), said external pipe of said termination device surrounding said internal pipe over substantially the entire height of the latter, a combustion air inlet means (5) being provided on the periphery said outside pipe at a height such that said air inlet means is located below and at a distance from said smoke outlet means, characterized in that the annular space (9) between said inside (2) and outside pipes (4) is filled with a thermal insulator in an area starting above said combustion air inlet means (5) and going to its upper end. Device according to claim 1, characterized in that a ring (19) obstructs the annular space (9) between said interior (2) and exterior (4) pipes above said combustion air inlet means (5 ). Device according to claim 1 or 2, characterized in that a first bell-shaped element (16) obstructs the annular space (9) between said interior (2) and exterior (4) pipes at the top end of said outside pipe. Device according to claim 3, characterized in that said first bell element (16) is fixed by interlocking with said inner pipe (2). Device according to claim 4, characterized in that said first bell element (16) is fixed by simultaneous crimping of its wall (20) and the wall (2) of said inner pipe. Device according to any one of the preceding claims, characterized in that said air inlet means (5) consists of a plurality of holes formed on the periphery of said outer pipe (4). Device according to any one of the preceding claims, characterized in that a second bell-shaped element (6) is fixed by its upper part to the periphery of said external pipe (4), just above said air inlet means (5), so that the body (15) of said second bell-shaped element (6) extends around the external pipe opposite said air inlet means. Device according to claim 7, characterized in that said second bell-shaped element (6) is fitted on said external pipe (4). Device according to claim 8, characterized in that said second bell-shaped element (6) is fixed by simultaneous crimping of its wall and of the wall of said external pipe (4). Device according to any one of the preceding claims, characterized in that the said smoke outlet means (3) is surmounted by a means forming an anti-draft head (8) comprising a ferrule (33) surrounding the said smoke outlet means and a helmet (35) disposed above said ferrule so that smoke escapes between the upper end of said ferrule and the periphery of said helmet. Device according to claim 10, characterized in that said helmet (35) comprises a bottom wall (38) of frustoconical shape narrowing downwards which is opposite said smoke outlet means (3). Device according to Claim 11, characterized in that a wall (18) of frustoconical shape narrowing upwards is formed around the upper end of the said inner tube (2), the angle of inclination of this wall being opposite at the angle of inclination of said lower wall (38) of frustoconical shape of said helmet (35). Device according to any one of claims 10 to 12, characterized in that said helmet (35) consists of an upper wall (36) and a lower wall (38), a compartment (40) empty or filled with 'a thermal insulator being formed between these two walls. Device according to any one of Claims 10 to 13, characterized in that said helmet (35) is of a size such that the periphery of said helmet constitutes the part of said termination device (1) furthest from the axis of said termination device. Device according to any one of the preceding claims, characterized in that the said inner pipe (2) has, at the upper end of the said bell element (16), a groove (27) capable of receiving a clip 24 by means of a clip a cylinder 28 placed at the same end, said clip-on fastening tab (24) being able to be removed from said groove (27) by exerting pressure there through a hole (23) provided for this purpose in said groove (27). Device according to any one of the preceding claims, characterized in that it comprises a sealed roof crossing system comprising a roof flashing (45) and a drip pan (51). Device according to claim 16, characterized in that said roof flashing (45) has an axis placed in a plane parallel to that of the roof and in a direction perpendicular to the direction of greatest slope of the roof. Device according to one of claims 16 or 17, characterized in that said roof flashing (45) comprises a frustoconical skirt (48) fixed on the one hand to a base plate (46) provided with a flap (47 ) and on the other hand, on a rod (52) provided with a fixing system formed by lugs (49) each comprising an orifice (50) surrounding said axis and designed to allow the angle of the frustoconical skirt to be adjusted (48) according to the slope of the roof.

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