ES2699437A1 - Heat exchanger device (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Heat exchanger device. The invention refers to a heat exchanger device (1) for a heating installation provided with a stove or boiler (2) and a gas outlet pipe (3), which also comprises at least one tubular element (4), with an upper end (4a) and a lower end (4b), and configured to fit around at least a part of the exhaust tube (3), and a fan (5) attached to the upper end of the tubular element (4 ) to provide a flow of outdoor air (6) from the upper end (4a) to the lower end (4b) of the tubular element (4), where said tubular element (4) is mounted to provide a circulation of the outdoor air flow ( 6) of the helical type to allow heat exchange between said external air flow (6) and the gases that circulate inside the gas outlet tube (3).

Description

DESCRIPTION

Heat exchanger device.

Object of the invention

The present invention relates to a heat exchanger device for a heating installation of the type that incorporates a stove or boiler connected to a gas outlet pipe (fumes), which is able to take advantage of the heat released by the pipe exit of gases in its exit to the outside of the house, improving the distribution of heat in the room, providing clean air and continuously oxygenate the stay.

BACKGROUND OF THE INVENTION

The operation of the primary part of any heat exchanger that uses fuels is based on the triangle of fire that is composed of fuel, comburent and ignition.

It does not matter what fuel is used. Oxygen is the necessary comburent for any combustion. Depending on the fuel, its PCI (lower calorific value) of its unburned and other multiple variables, this will be the optimal fuel / comburent mixture.

In conventional installations, the stoves extract air from the room that is heating up, which is burned and goes through the chimney. A depression is being created in the room that causes outside air to enter through the windows, the door or any other crack in the room. In figure 1 we can see schematically the air flow (33) that would be in a room heated in a conventional manner. If we sealed the room, we would not get cold air from the outside but we would consume the oxygen in the room, and the chimney would not be thrown away, getting to smoke the house.

In this situation, it is desirable to provide the oxidizer (oxygen) to the flame in a more effective and safer manner.

The sector of the manufacture and distribution of fireplaces and wood stoves, reaches a level of global turnover of more than 100 million euros, employing more than 3,000 people in Spain.

According to the Spanish Association of Energy Valorization of Biomass (AVEBIOM) the consumption of biomass for thermal use in Spain is shooting up. The consumption of pellets in Spain multiplied by 2.7 since 2012. The Spaniards went from consuming 100,000 tons of pellets in 2010 to consuming 380,000 tons in 2013. This figure is especially relevant if one takes into account that in 2014 and 2015 the The price of diesel was low and the winters were not particularly hard either. Both circumstances were not ideal to favor the growth of pellets, however, consumption continued to increase.

The forecasts published by different organizations speak of a consumption that in the horizon 2020, will exceed the 1,100,000 tons of pellets. The majority is used to produce heat, and the residential sector consumes more than 50% of total consumption.

According to data provided by the National Observatory of Biomass Boilers (ONCB), in 2013 there were 80,000 installations in operation in Spain and an accumulated capacity of 5,000 thermal MW. Forecasts indicate that by 2020, 12,000 MW of power will be operational for thermal use.

Taking into account the figures and forecasts, a conclusive conclusion can be drawn: in Spain it is cheaper to heat with pellets than with gas or diesel, and in the current economic scenario, optimizing resources is essential to maintain the strong demand for thermal energy in the industrial sphere and in the welfare of households.

In relation to the above, in Spain, Royal Decree 1027/2007: Regulation of Thermal Installations in Buildings (RITE), is mandatory. It establishes the obligation to evacuate all the gases and fumes from combustion from new buildings in the roof, as well as the reduction of emissions of nitrogen oxides and other pollutants, as well as the improvement in energy efficiency of the buildings. thermal installations.

Description of the invention

The invention consists of a heat exchanger device for a heating installation provided with a stove or boiler and a mobile gas outlet pipe which is presented as an improvement over what is known in the state of the art, since it manages to reach satisfactorily the objectives previously indicated as suitable for the technique.

The heat exchanger device proposed by the present invention comprises at least one tubular element, with an upper end and a lower end, where said tubular element is configured to couple around at least a part of the exhaust pipe, and a fan coupled to the upper end of the tubular element to provide an external air flow from the upper end to the lower end of the tubular element. The tubular element is mounted to provide a flow of helical-type external air flow, to allow heat exchange between said outside air flow and the gases circulating inside the gas outlet tube.

The heat exchanger consists of a tubular element adapted to be mounted around the gas outlet pipe, to provide comburent from the outside and also to recover the heat of the smoke that is usually wasted. The invention makes it possible to supply an excess of air above that required as combustion combustion, which serves to inflate the house with hot air, so that the heat is distributed everywhere without the need for pipelines.

The invention provides a sensation of heat radically different from that of a conventional stove, furthermore, it decreases the combustion temperature and the temperature in the iron of the hearth of the stove. The distribution of heat is more homogeneous, the transmission of heat by radiation decreases and the sensation is very pleasant. A possible example of this would be to imagine the lighting of a living room from a single 1000-watt projector projecting dazzling light and shadow areas, or having those 1000 watts distributed by panels paneled with indirect light and without shadows.

In addition, the invention allows to provide clean air in a constant manner and at a very pleasant temperature, continuously oxygenating the room. Household smells are not concentrated around the stove, but away from it.

By providing a helical-type external airflow circulation, the invention allows increasing the path of incoming air. With a length of tubular element of 1m and a step of 0.25m, the air travels 2.25m which is more than 200% more travel.

Likewise, when mounting the fan at the upper end of the tubular element, the pressure in the tubular element (comburent) is higher than that of the exhaust pipe, so, in case of leakage, deterioration or any crack in the gas outlet pipe, there would never be a risk of monoxide.

With the present invention, the regulation of the draft of the stove is no longer made in the flue pipe. It is necessarily done in the air inlets while the flue remains completely open. This is because the pressure in the house forces the combustion of the stove and it is necessary to restrict the comburent.

According to a preferred embodiment, the tubular element consists of a flexible hose provided with flat ends to facilitate the entry and exit of the external air flow.

Preferably, the hose incorporates nestable profiles to facilitate the assembly of said hose around the gas outlet pipe.

Preferably, the hose incorporates anchors located to be arranged along a same axis when the hose is coupled around the gas outlet pipe. The device may further comprise a trim configured to cover at least a part of the hose, wherein said trim is attached to the hose by the anchors.

The flexible hose type tubular element offers an economical and easy installation solution.

According to another preferred embodiment, the tubular element is formed by a plurality of annular elements internally configured to provide a helical path to the external air flow.

Preferably, the annular elements are formed by an inner cylinder and an outer cylinder arranged concentrically, and joined by a profile defining a helical ramp for the passage of the external air flow, where the inner cylinder is sized to receive the gas outlet pipe.

The inner and outer cylinders can form annular elements with open or closed bases.

Alternatively, and equally preferably, the annular elements are formed by a cylinder attached to a profile defining a helical ramp for the passage of the external air flow, where the width of the profile is such that it allows to receive the gas outlet pipe .

Preferably, the device further comprises an annular cover, dimensioned to fit between the inner and outer cylinder, and provided with a mouth configured to continue the helical ramp defined by the profile and allow entry or exit of the external air flow.

The tubular element formed by annular elements offers a modular and versatile solution, easily adaptable to a specific installation.

According to a first preferred embodiment, the annular elements have bases with corresponding profiles to fit between them.

Alternatively, the annular elements have bases with flat lips to receive clips and / or bolts and allow fixing therebetween.

Alternatively, the annular elements have at least partially threaded ends to allow attachment therebetween.

Preferably, the tubular element incorporates a recess or nozzle at each of its ends to allow entry and exit of the external air flow.

Preferably, the tubular element incorporates a recess or nozzle at each of its ends to allow entry and exit of the external air flow.

Preferably, the recess of the upper end is disposed substantially perpendicular to the axial axis of the tubular element, and the recess of the lower end substantially parallel to said axial axis.

Preferably, the upper and lower end nozzles are disposed substantially parallel to the axial axis of the tubular element.

Preferably, the device further comprises a filter disposed at the lower end of the tubular element. If the device includes a recess or nozzle at the lower end of the tubular element, the filter will be there housed. In this way, they can be coupled from anti-pollen filters to anti-dust filters, as well as air fresheners capable of invading the whole room of clean and perfumed air.

According to a preferred embodiment, the tubular element comprises a channel in its side wall to accommodate wiring and allow electronic control of the fan.

The outside air intake is forced through the fan that can be installed outside or inside the room, with the air intake always on the outside.

The external fan can be accompanied by a small solar panel and an energy accumulator so that it can operate 24 hours continuously. In the interior of the house the operating controls of the fan would be installed. In order to avoid inclement weather, its design and installation should contemplate some type of outdoor protection. The main advantage is that you only have to make a hole to put the chimney. In installations already made, it would be enough to extend the hole.

The internal fan has the advantage that it is more protected from inclement weather weather. It can be easily added to existing installations, it allows to have several exchanger lengths. The main drawback is that it requires a new hole. The fan motor power can be by solar panel with accumulator.

A last preferred embodiment of the invention consists in carrying out an external concentric conduction with the flue pipe of the stove or boiler, and even wrapping the stove or boiler where the fuel is burned, in whose interior space, defined between the tubular element and the exhaust pipe and the contour of the stove or boiler, there is a partition in the form of a helix, causing the air flow to circulate from the top of the flue pipe to the location of the stove or boiler, by action of the fan that drives said air, is more time in contact and during a longer journey, with the heat of the stove or boiler and the smoke outlet, taking advantage of the heat that is transmitted through the walls of the whole. The hot air outlet would be finished either with an envelope casing on the stove or boiler, or the propeller would be finished with a design integrated in the stove itself, where even this structure is expected to be integrated in the door (s) design, in a way that does not impede its opening and at the same time fulfills its function of allowing the passage of air hermetically to make the exchange at the hottest point. This installation will allow the installation of the filters for the scented system of the room, as well as of any other purifying or treating element of that air.

Description of the drawings

To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, according to a preferred example of practical realization thereof, accompanying as an integral part of said description, drawings wherein in character illustrative and not limiting, the following has been represented:

Figure 1 shows a schematic view of a conventional heating installation, equipped with a stove or boiler and gas outlet pipe.

Figure 2 shows a schematic view of a heat exchanger device for a heating installation of the type shown in Figure 1, according to a preferred embodiment of the invention.

Figure 3 shows a flexible hose, according to a preferred embodiment of the invention. Figure 3a shows the hose mounted around the gas outlet pipe. Figure 3b shows the extended hose.

Figure 4 shows a schematic view of a heat exchanger device with tubular element of hose type.

Figure 5 shows a perspective view of a section of a hose provided with a nestable profile for mounting said hose around the exhaust pipe.

Figure 6 shows a first configuration of an annular element, according to a preferred embodiment of the invention. Figure 6a shows the design of the annular element. Figure 6b shows a perspective view of the annular element.

Figure 7 shows a detail of a sealing gasket capable of preventing air leaks in the junction of the annular elements.

Figure 8 shows a second configuration of the annular element, according to a preferred embodiment of the invention. Figure 8a shows the design of the annular element. Figure 8b shows a perspective view of the annular element.

Figure 9 shows a perspective view of an annular cover provided with a mouth to allow the entry or exit of the external air flow.

Figure 10 shows a third configuration of the annular element, according to a preferred embodiment of the invention.

Figure 11 shows a first configuration of the bases of the annular elements, according to a preferred embodiment of the invention. Figure 11a shows a perspective view of the stacking of some annular elements. Figure 11b shows the detail of said stack.

Figure 12 shows a second configuration of the bases of the annular elements, according to a preferred embodiment of the invention. Figure 12a shows a perspective view of the stacking of some annular elements. Figure 12b shows the detail of said stack.

Figure 13 shows a clip arranged between the bases of two annular elements to join them.

Figure 14.- Shows a bolt disposed between the bases of two annular elements to join them.

Figure 15.- Shows a third configuration of the bases of the annular elements, according to a preferred embodiment of the invention.

Figure 16 shows a fourth configuration of the bases of the annular elements, according to a preferred embodiment of the invention. Figure 16a shows the design of the annular element. Figure 16b shows a detailed view of the annular element of Figure 16a.

Figure 17.- Shows a plurality of annular elements, where the elements provided at the ends incorporate recesses to facilitate the entry and exit of the external air flow.

Figure 18 shows a plurality of annular elements, where the elements provided at the ends incorporate vertical nozzles to facilitate the entry and exit of the external air flow.

Figure 19 shows an annular element provided with a lateral channel to accommodate cabling. Figure 19a shows a perspective view of the annular element. Figure 19b shows a cross section of a part of the annular element in which the channeling is seen.

Figure 20.- Shows a schematic and partial view of a trim provided around an annular element, according to a preferred embodiment of the invention.

Figure 21.- Shows a schematic view of the heat exchanging device according to a preferred embodiment of the invention.

Figure 22 shows a preferred embodiment of the heat exchanger device of the invention.

PREFERRED EMBODIMENT OF THE INVENTION

Figure 2 shows a heat exchanger device (1) for a heating installation provided with an oven or boiler (2) and a gas outlet pipe (3).

The device comprises at least one tubular element (4), with an upper end (4a) and a lower end (4b), and a fan (5) coupled to the upper end (4a) of said tubular element (4) to provide a outside air flow (6).

The tubular element (4) is adapted to fit around the gas outlet pipe (3) and provide a flow of the external air flow (6) of helical type to allow the exchange of heat between said outside air flow (6) and the gases that circulate inside the gas outlet pipe (3).

In this way, a flow of hot outside air (6) is provided, which in addition to heating the room, feeds the stove (2) with oxygen (oxidizer).

Figure 3 shows a first preferred embodiment of the tubular element (4), which consists of a flexible hose. As seen in Figure 3a, the hose, mounted around the gas outlet pipe (3), provides a flow of the outside air flow (6) helical type. Figure 3b shows the extended hose, and equipped with ends with flat faces, substantially perpendicular to the longitudinal axis of the hose, to facilitate the entry and exit of outside air flow (6).

Figure 4 shows schematically, the heat exchanger device (1) with a tubular element (4) of hose type.

As shown in Figure 5, the hose can incorporate nestable profiles (7) (configured to fit between them), in order to facilitate the assembly of the hose around the gas outlet pipe (3).

Figures 6, 8 and 10 show variations of a second preferred embodiment of the tubular element (4), which consists of a plurality of annular elements (10), internally configured to provide a helical path to the external air flow (6).

Figures 6a and 6b show a straight annular element (10), with access ramp and closed in its bases.

The annular elements (10) of the type shown in Figure 6 can have a gasket (21) to prevent air leaks in their junction. Figure 7 shows a detailed view of a gasket (21).

Figures 8a and 8b show an annular element (10) with helicoid. It has no covers since the propeller itself creates a closed circuit when stacked on top of each other using a support fold. The propeller maintains the structure firm and acts as a link between the annular elements (10).

Thus, the annular elements (10) of figures 8a and 8b are formed by an inner cylinder (11) and an outer cylinder (12) arranged concentrically, and joined by a profile (13) defining a helical ramp for the passage of the external air flow (6), and where the inner cylinder (11) is sized to receive the gas outlet pipe (3).

In this case, the inner cylinder (11) and the outer cylinder (12) would carry the joints of sealing at its ends to provide a hermetic seal between the various annular elements (10).

The annular elements (10) of the type shown in figure 8 can have a cover with air inlet or outlet. Figure 9 shows a perspective view of this annular cover (15) sized to fit between the inner cylinder (11) and the outside (12) and provided with a mouth (16) configured to continue the helical ramp defined by the profile ( 13) and allow the entry or exit of the outside air flow (6).

Figure 10 shows an annular element (10) with helicoid, similar to that shown in figures 8a and 8b, but without inner cylinder.

Thus, the annular element (10) of Figure 10 is formed by a cylinder (20) attached to a profile (13) defining a helical ramp for the passage of the external air flow (6), where the profile width ( 13) is such that it allows receiving the gas outlet pipe (3).

Figure 11 shows a first configuration of the bases (14) of the annular elements (10), which have corresponding profiles to fit between them, and facilitate their stacking.

Figure 12 shows a second configuration of the bases (14) of the annular elements (10), which have flat lips (22) to receive clips (23) and / or bolts (24) and allow fixing therebetween.

Figure 13 shows a clip (23), and Figure 14 a pin (24), both arranged between the bases (14) of two ring elements (10) to join them.

Figure 15 shows a third configuration of the bases (14) of the annular elements (10), which have ends (entirely) threaded to allow attachment between them.

Figures 16a and 16b shows a fourth configuration of the bases (14) of the annular elements (10), which have partially threaded ends, or bayonet type (34), to allow attachment between them.

According to a preferred embodiment, the tubular element (4) can incorporate a recess (17) or nozzle (18) at each of its ends (4a, 4b) to allow entry and exit of the outside air flow (6).

Figure 17 shows a tubular element (4) with a recess (17) is disposed substantially perpendicular to the axial axis (19) of the tubular element (4) at its upper end (4a), and a recess (17) disposed substantially parallel to said axial axis (19) at its lower end (4b).

Figure 18 shows a tubular element (4) with nozzles (18) arranged substantially parallel to the axial axis (19) of the tubular element (4) at its upper (4a) and lower (4b) ends.

According to a preferred embodiment, the heat exchanging device (1) further comprises an exchangeable filter (26) coupled to the lower end (4b) of the tubular element (4). They can be attached from anti-pollen filters to anti-dust filters, as well as air fresheners to invade the entire stay of clean and perfumed air.

According to another preferred embodiment, the tubular element (4) comprises a channel (8) in its side wall to accommodate wiring (9) and allow electronic control of the fan (5). Figure 19 shows an annular element (10) with lateral channel (8) to accommodate wiring (9) and allow electronic control of the fan (5). The fan (5) can be controlled by integrated home automation in a mobile device or Smartphone.

Figure 20 shows a partial schematic view of an annular element (10) of the type formed by a cylinder (20) internally joined to a profile (13) sized to receive the gas outlet pipe (3), and where a Embellisher (25) is provided around the annular element (10).

Figure 21 shows a schematic view of the heat exchanger device (1) mounted in a heating installation with stove (2) and gas outlet pipe (3), in which the stacking of tubular elements (10) for forming tubular element (4), and the fan (5) coupled to the upper end of said tubular element (4) to supply a external air flow (6) inside the tubular elements (10), and finally to the stove (2) to heat the room. At the lower end of the tubular element (4) there is provided a recess for receiving the filter (26). The fan (5) forces the entry of fresh air, and can be installed outside or inside the room, but the air intake (27) is on the outside.

As shown in Figure 21, the heat exchanging device (1) can further comprise a controller (28) configured to manage the activation / deactivation of the fan (5) from the information received from a user and / or the stove (two). The controller (28) is connected to a power source (29), which also supplies the fan (5) and the sensors or other devices next to the stove (2).

Figure 22 shows a last preferred embodiment of the invention consists in making an external tubular element (4) with the flue pipe (3) from the stove or boiler (2) and even getting to wrap said tubular element ( 4) to the stove or boiler (2) where the fuel is burned, said duct (4) adapting to the external shape of the stove or boiler (2), as shown in the aforementioned drawing. Inside the tubular element (4) there is a helical-shaped partition (30), which makes contact between the walls of the tubular element (4) and the flue pipe (3) and the stove or boiler (4). 2), causing the air flow (31) to circulate from the top of the flue pipe, driven by the fan (5) to the location of the stove or boiler, is longer and during a longer travel in contact with the heat of the stove or boiler and the smoke outlet taking advantage of the heat that is transmitted through the walls of the whole. The hot air outlet (32) would be finished off either with a wraparound casing on the stove or boiler, or said propeller (30) would be finished with a design integrated in the stove itself, where even this structure is expected to be integrated in the door (s) of the design, so that it does not impede its opening and at the same time fulfills its function of allowing the passage of air in a hermetic manner to make the exchange at the hottest point. This installation will allow the installation of the filters for the scented system of the room, as well as of any other purifying or treating element of that air.

Finally, in view of this description and figures, the person skilled in the art will be able to understand that the invention has been described according to some preferred embodiments thereof, but that multiple variations can be introduced in said preferred embodiments, without leaving the object of the invention. invention as it has been claimed.

Claims (18)

1. - Heat exchanger device (1) for a heating installation provided with a stove or boiler (2) and a gas outlet pipe (3), characterized in that it comprises at least one tubular element (4), with a upper end (4a) and a lower end (4b), and configured to couple around at least a part of the gas outlet pipe (3), and a fan (5) coupled to the upper end of the tubular element (4) for providing an outside air flow (6) from the upper end (4a) to the lower end (4b) of the tubular element (4), wherein said tubular element (4) is mounted to provide a flow of the outside air flow (6) of helical type to allow heat exchange between said external air flow (6) and the gases circulating inside the gas outlet pipe (3). 2. - Heat exchanger device (1) for a heating installation, according to claim 1, characterized in that the tubular element (4) consists of a flexible hose provided with ends with flat faces substantially perpendicular to the longitudinal axis of the hose for facilitate the entry and exit of the outside air flow (6). 3. - Heat exchanger device (1) for a heating installation, according to claim 2, characterized in that the hose incorporates nestable profiles (7) to facilitate the assembly of said hose around the gas outlet pipe (3). 4. - Heat exchanger device (1) for a heating installation, according to any of claims 2-3, characterized in that the hose incorporates anchors located to be arranged along a same axis when the hose is coupled around the gas outlet pipe (3). 5. - heat exchange device (1) for a heating installation, according to claim 4, characterized in that it also comprises a trim configured to cover the hose, where said trim is attached to the hose by the anchors. 6. - Heat exchanger device (1) for a heating installation, according to the claim 1, characterized in that the tubular element (4) is formed by a plurality of annular elements (10) internally configured to provide a helical path to the external air flow (6). 7. - Heat exchanger device (1) for a heating installation, according to claim 6, characterized in that the annular elements (10) are formed by an inner cylinder (11) and an outer cylinder (12) arranged concentrically , and joined by a profile (13) defining a helical ramp for the passage of the external air flow (6), and where the inner cylinder (11) is sized to receive the gas outlet pipe (3). 8. - Heat exchanger device (1) for a heating installation, according to claim 6, characterized in that the annular elements (10) are formed by a cylinder (20) attached to a profile (13) defining a helical ramp for the passage of the external air flow (6), where the width of the profile (13) is such that it allows to receive the gas outlet pipe (3). 9. - Heat exchanger device (1) for a heating installation, according to any of claims 6-8, characterized in that the annular elements (10) have bases (14) with corresponding profiles to fit between them. 10. - Heat exchanger device (1) for a heating installation according to any of claims 6-8, characterized in that the annular elements (10) have bases (14) with flat lips (22) to receive loops (23) ) and / or bolts (24) and allow fixing between them. 11. - Heat exchanger device (1) for a heating installation, according to any of claims 6-8, characterized in that the annular elements (10) have ends at least partially threaded to allow attachment between them. 12. - Heat exchanger device (1) for a heating installation according to any of claims 7-11, characterized in that it also comprises an annular cover (15) sized to fit between the inner cylinder (11) and the outside ( 12 and provided with an embouchure (16) configured to continue the helical ramp defined by the profile (13) and allow the entry or exit of the outside air flow (6). 13. - Heat exchanger device (1) for a heating installation, according to any of the preceding claims, characterized in that the tubular element (4) incorporates a recess (17) or nozzle (18) at each of its ends ( 4a, 4b) to allow entry and exit of the outside air flow (6). 14. - Heat exchanger device (1) for a heating installation, according to claim 13 and 6-12, characterized in that the recess (17) of the upper end (4a) is arranged substantially perpendicular to the axial axis (19) of the tubular element (4), and the recess (17) of the lower end (4b) substantially parallel to said axial axis (19). 15. - Heat exchanger device (1) for a heating installation, according to claim 13 and 6-12, characterized in that the nozzles (18) of the upper end (4a) and lower (4b) are arranged substantially parallel to the axis axial (19) of the tubular element (4). 16. - Heat exchanger device (1) for a heating installation, according to any of the preceding claims, characterized in that it further comprises a filter (26) arranged on the lower end (4b) of the tubular element (4). 17. - Heat exchanger device (1) for a heating installation, according to any of the preceding claims, characterized in that the tubular element (4) comprises a channel (8) in its side wall to accommodate wiring (9) and allow the electronic control of the fan (5). 18. - Heat exchanger device (1) for a heating installation according to claim 1 characterized by having an external tubular element (4) with the flue pipe (3) of the stove or boiler (2) and even wrapping said tubular element (4) to the stove or boiler (2) where the fuel is burned, said duct (4) adapting to the external shape of the stove or boiler (2) and arranging inside the tubular element ( 4) of a helix-shaped partition (30), which makes contact between the walls of the tubular element (4) and the flue pipe (3) and the stove or boiler (2), so that the air flow (31) circulates from the top of the flue pipe, driven by the fan (5) to the location of the stove or boiler, where the exit of said air to the room to be heated will be available.