EP2923152A1 - Device for improving combustion in a fireplace - Google Patents

Device for improving combustion in a fireplace

Info

Publication number
EP2923152A1
EP2923152A1 EP13808098.1A EP13808098A EP2923152A1 EP 2923152 A1 EP2923152 A1 EP 2923152A1 EP 13808098 A EP13808098 A EP 13808098A EP 2923152 A1 EP2923152 A1 EP 2923152A1
Authority
EP
European Patent Office
Prior art keywords
tubes
tube
section
openings
revendi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13808098.1A
Other languages
German (de)
French (fr)
Other versions
EP2923152B1 (en
Inventor
Jean-François BOUJUT
Thierry HENOCQUE
David LEPINEY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finoptim
Institut Polytechnique de Grenoble
Original Assignee
Finoptim
Institut Polytechnique de Grenoble
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Finoptim, Institut Polytechnique de Grenoble filed Critical Finoptim
Publication of EP2923152A1 publication Critical patent/EP2923152A1/en
Application granted granted Critical
Publication of EP2923152B1 publication Critical patent/EP2923152B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/189—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by air-handling means, i.e. of combustion-air, heated-air, or flue-gases, e.g. draught control dampers 
    • F24B1/19—Supplying combustion-air
    • F24B1/1902—Supplying combustion-air in combination with provisions for heating air only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/188—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas  
    • F24B1/1885—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas   the heat exchange medium being air only
    • F24B1/1886—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by use of heat exchange means , e.g. using a particular heat exchange medium, e.g. oil, gas   the heat exchange medium being air only the heat exchanger comprising only tubular air ducts within the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/191—Component parts; Accessories
    • F24B1/193—Grates; Irons

Definitions

  • the present application relates to a device that can be integrated into a chimney. More particularly, the present application relates to such a device for improving combustion within a chimney.
  • chimneys are known. Two main types of chimneys can be distinguished: closed fireplaces in which the fireplace is confined in a closed enclosure, and open fireplaces in which at least one wall of the fireplace is in contact with the open air.
  • the high temperature in the home can limit these toxic emissions.
  • the Combustion temperature is generally greater than 573 ° C, and more complete combustion occurs than in the case of an open fire, during which volatile elements harmful to the environment and health are burned.
  • An object of an embodiment is to provide a device that can be integrated within a chimney and ensuring the realization of a double combustion.
  • an embodiment provides a device defining approximately a shape of L and having, in the foot of the L, at least two first nested tubes and, in the branch of the L, at least a second tube provided with at least one opening , the first tubes being arranged to define a conduit between an end of a first central tube and the at least one opening through defined passages at the ends of the first tubes.
  • the second tube comprises a plurality of lateral openings.
  • the conduit travels the entire volume of the first and second tubes.
  • the first and second tubes are circular in section.
  • the first and second tubes are made of refractory steel, stainless steel, cast iron, or a metal such as copper.
  • the first tubes define stages of the duct, the stages having an increasing section with their distance to the center of the first tubes.
  • the section of a second tube is smaller than the section of an external stage.
  • the axes of the first tubes are parallel to each other and coplanar in a plane passing through the second tube, the axis of a first tube of a first section being located above the axis of a first tube of a second section if the first section is greater than the second section.
  • the device further comprises a third tube provided with at least one additional opening, the third tube being parallel to the second tube, being located at the end of the first tubes opposite to the second tube, and extending from a first tube inter ⁇ statisticire to form a second conduit.
  • the device comprises three first tubes.
  • An embodiment further provides an insertable block in a chimney comprising at least one device as proposed above.
  • the block comprises at least two devices as proposed above defining independent conduits, the devices being held in position by means of a frame comprising four side walls.
  • the block further comprises a removable plate capable of being positioned on the surface of the frame to close the top of the frame.
  • a wall of the frame comprises discharge openings associated with a discharge duct.
  • the exhaust duct is defined along the armature, on the side of the second tubes.
  • Figure 1 is a schematic perspective view of an example of an open fireplace
  • Figures 2 and 3 are respectively a perspective view and a sectional view of a block according to one embodiment
  • Figure 4 is an enlarged sectional view illustrating an elementary structure of a block according to one embodiment
  • FIGS. 5A and 5B illustrate elements for maintaining an elementary structure according to one embodiment
  • Figures 6, 7 and 8 are, respectively, two perspective views and a sectional view of a variant of a device according to one embodiment.
  • Figures 9A and 9B respectively show a top view and a front view of a variant of a device according to one embodiment, Figure 9A being a sectional view along the plane A-A of Figure 9B.
  • FIG. 1 illustrates an example of a chimney in which a block according to one embodiment can be inserted.
  • the chimney shown in Figure 1 is an open fireplace, that is to say that the fireplace is not partitioned by a closed chamber but is created in an enclosure open at least on one of its sides.
  • combustion improving block proposed here is also adapted to be integrated into a closed fireplace or stove, to further improve the combustion of harmful volatile elements that would still be present within such a device.
  • the chimney comprises a hearth 10, also called hearth, closed by a bottom 12, the side walls 14, and a horizontal floor 16.
  • the top of the chimney is partitioned by a throat 18 whose section is reduced to reach a conduit 20 for evacuation of fumes.
  • the floor 16 may be covered with andirons, not shown, on which are arranged fire logs.
  • a system of recovery of ash, not shown, is generally provided at the floor level of the chimney.
  • the combustion temperature of the wood is limited by the supply of fresh air from the side of the opening of the chimney.
  • the temperature above the flames can be less than 573 ° C, which allows only partial combustion: harmful volatile elements released during the main combustion of wood (also called first combustion) are not burned.
  • a device capable of being integrated into a chimney of the type of Figure 1, but also in a closed fireplace, allowing the realization of a double combustion in the home, this dual combustion for the combustion of at least a part of the harmful elements from the first combustion.
  • double combustion or after-combustion or second combustion, is meant here a combustion which is created by an intake of fresh air, the secondary air, at the level of the fumes, at a temperature sufficient for the combustion of harmful gases takes place. In practice, this temperature is greater than or equal to 573 ° C.
  • Figure 2 is a perspective view of such an insertable device within the fireplace of a fireplace.
  • the device of Figure 2 comprises a tray 30 defining a volume in which the fire logs will be placed.
  • This tray 30 comprises for example four side walls.
  • the bottom of the tank 30 is delimited by a set of horizontal elements 32 acting as andirons.
  • the andirons 32 extend between the front and rear of the tank 30, that is to say they will be placed between the front and the back of the fireplace fireplace in use.
  • the andirons are constituted, as we shall see later, several tubes, for example cylindrical, nested and communicating with each other.
  • Openings 34 are defined on the front face of the receptacle 30, these openings corresponding to the end of the central tubes of each of the andirons 32.
  • Each element of greater section of each of the andirons 32 is connected to the rear of the device, that is to say in the part which will be arranged at the bottom of the hearth of the chimney, to a vertical tube 36.
  • the vertical tubes 36 comprise a set of openings 38 preferably defined laterally and on the side of the hearth.
  • the insertable block proposed here comprises a set of independent elementary structures each consisting of a chenet 32 and a vertical tube 36 held in position relative to each other.
  • the chenet 32 plays the role of a counter-current exchanger air-ember so that air, inserted through the opening
  • the secondary air heated within the andirons 32 and tubes 36 is returned to the top of the flames, through the openings 38, at a temperature sufficient for the mixture between this air and the gases from the flames fire present at the openings 38 at a temperature above 573 ° C.
  • the injection of secondary air via the duct formed between the openings 34 and 38 makes it possible to perform a double combustion at the openings 38, and thus to burn off the harmful gases which are released from the first combustion and who were not burned at the flames.
  • the inventors have found that it is necessary to provide at least a double passage, and preferably a triple passage, of the secondary air along the length of the andirons, a simple passage not allowing sufficient preheating of the secondary air to reduce pollution.
  • the andirons 32 are preferably arranged so that a space separates them so that ashes formed during the burning of the wood fall into an ash collection receptacle placed beneath the device (not shown).
  • the space between the andirons 32 may be between 5 and 20 mm, preferably 10 mm. Such a gap keeps hot embers above the fender 32, while allowing the evacuation of ash down.
  • each system comprising a asso ciation ⁇ a grate 32 and a vertical tube 36 functions independently and defines a conduit for supplying air independent.
  • the secondary air heated at the level of the andirons is distributed on each of the vertical tubes 36, which ensures the realization of a double combustion on a large surface of the bottom of the chimney.
  • Figure 3 is a sectional front-to-back view of the device of Figure 2.
  • Figure 4 shows, in isolation and enlarged, only this association.
  • each chenet 32 consists of a set of nested tubes. In the example shown, three nested tubes are shown, but it will be noted that less than or more than three tubes may be used, preferably an odd number of tubes to facilitate the entry of air.
  • the chenet 32 comprises a first central tube 40, a second intermediate tube 42, and an outer tube 44.
  • the central tube 40 has an end located at the front of the device which corresponds with the opening 34 of the container 30.
  • lateral openings 46 are provided which allow the air from the central tube 40 to the intermediate tube 42.
  • the bottom of the central tube 40 is in this case closed.
  • the lateral openings 46 are located at the bottom of the tube 40, that is to say opposite the opening 34, so that the air circulates all along the central tube 40 before passing into the intermediate tube 42.
  • the intermediate tube 42 comprises lateral openings 48 which allow air to flow from the intermediate tube 42 to the outer tube 44. The front end of the tube 42 is in this case closed.
  • the vertical tube 36 is provided to nest in the outer tube 44 at the bottom thereof (side openings 46) so as to form a hermetic assembly.
  • openings 49 may be provided alternately either in the tube 44 or in the tube 36 to allow air to flow between these two tubes.
  • the device defines a hermetic conduit between the air inlet point 34 and the lateral openings 38 formed in the vertical tube 36.
  • the axes of the tubes 40, 42 and 44 are provided as being parallel and coplanar in a plane passing through the vertical tube 36, the axis of an outer tube being located above the axis of a tube inside. This ensures heat exchange with the brazier of good quality.
  • tubes 40, 42 and 44 are only one example, and that other assemblies allowing the realization of the same function, that is to say to define a conduit between one end of a chenet 32 and openings defined in the vertical tubes by snaking in the different tubes, may be provided.
  • tubes 40 and 42 slightly shorter than the length of the andirons 32 and held by one of their ends, so that the air flows between the tubes via the free ends of the tubes 40 and 42 (on the opposite side to the tube holding system).
  • logs are placed on the surface of the andirons 32.
  • this arrangement makes it possible to form a very hot zone on the surface of the andirons 32, which heats the air circulating in the duct formed between the inlet 34 and the outlets 38 , and first of all the air in the stage defined between the outer tube 44 and the intermediate tube 42.
  • the tubes 40, 42 and 44 define in the fluggers 32 counter-current heat exchangers.
  • it operates in the andirons 32 a natural convection of air due to these heat exchanges.
  • the section of the central tube 40 (first stage) is smaller than that of the second stage (inner section of the tube 42 minus outer section of the tube 40), and that the latter is smaller than the section of the third stage (inner section of tube 44 minus outer section of tube 42).
  • This allows a relaxation between each stage, which causes a slowing of the air flow between the different tubes and allows to store a greater amount of heat energy in the heat exchange with the brazier.
  • Air compression also occurs at the inlet of the duct at the opening 34.
  • the cross section of the vertical tube will preferably be smaller than the section of the third stage so that it is created at the inlet of the tube 36 a compression and therefore a new acceleration of the air flow before coming into contact with the unburnt combustible gases to cause double combustion at the openings 38.
  • This configuration advantageously helps to improve the natural convection of air between the inlet 34 and the outlet openings 38.
  • the central tube 40 may have an internal diameter equal to 9.5 mm and a thickness of 2 mm (section of the first stage equal to 70.9 mm 2 ), the intermediate tube may have an internal diameter equal to 17.3 mm and a thickness equal to 2 mm (section of the second stage equal to 92 mm 2 ), the outer tube 44 may have an internal diameter equal to 36 mm and a thickness of 2 mm (section of the third stage equal to 661.6 mm 2 ), and the vertical tube 36 may have an internal diameter equal to 9.5 mm and a thickness of 2 mm, that is to say a section of this tube of the order 70, 9 mm 2 .
  • the openings 46 defined between the first stage and the second stage may have a section equal to 84.8 mm 2
  • the openings 48 between the second stage and the third stage may have a section equal to 115.5 mm 2
  • the openings 49 between the third stage and the vertical tube may have a section equal to 70, 9 mm 2
  • the lateral openings 38 defined on the height of the tube 36 may be made by drilling, and have a diameter of between 3 and 6 mm. It will be noted that the opening 34 will advantageously be provided with the same diameter as the internal diameter of the central tube 40.
  • the outer tube 44 and the vertical tube 36 may be, to be compatible with the direct contact with the brazier, refractory steel or stainless steel.
  • the tubes 40 and 42 can also be made of steel refractory, or stainless steel.
  • the tubes mainly those in contact with the brazier, will be of a material with high temperatures and high thermal conductivity, for example cast iron or a metal such as copper.
  • the walls of the receptacle 30 are preferably made of an insulating material, for example vermiculite.
  • FIGS. 5A and 5B illustrate a practical embodiment of sleeves intended to be positioned at the front and at the rear of the andirons 32 so as to hold the different tubes 40, 42, 44 in position.
  • tubes 40, 42 and 44 of circular section are considered.
  • a front sleeve 50 (FIG. 5A) is provided on the front part of the chenet 32, for example integral with the receptacle 30, and a rear sleeve 52 (FIG. 5B) is provided on the rear part of the receptacle 30 so as to maintain the tubes 40, 42 and 44 in position.
  • the front sleeve 50 has an opening of the same diameter as the opening 34, intended to be positioned opposite the opening 34.
  • the sleeve 52 is hermetically sealed. Opposite the opening 34, the rear sleeve has a circular portion 53 in extra thickness.
  • the sleeve holding elements ensure correct positioning of these, and therefore tubes 40, 42 and 44 (so as to ensure significant heat exchange with the brazier).
  • Other structures for holding the tubes 40, 42 and 44 (which are not necessarily circular in section) within the andirons 32 may be provided.
  • FIG. 6 illustrates an alternative embodiment of the insertable block in a chimney of FIG. 2.
  • openings 60 are formed in the rear part of the receptacle 30, above the andirons 32.
  • a rear piece 62 is placed at the back of the openings 60 to form a duct 64 between these openings 60 and the upper part of the chimney.
  • the structure of the openings 60 and of the part 62 allows evacuation of the fumes from the fire via the duct 64.
  • This variant is particularly advantageous in a case where it is desired to close the device of FIG.
  • FIGS. 6 and 7 the front sleeves 50 are visible on the front of the receptacle 30.
  • FIGS 7 and 8 illustrate this state, respectively in perspective and in sectional view.
  • a removable plate 70 is placed above the brazier so as to seal the receptacle 30.
  • the smoke from the combustion are then discharged through the openings 60 to the conduit 64, and are redirected by this conduit to the duct 18 of the chimney.
  • the closing of the receptacle 30 by the plate 70 can be performed at the end of combustion, when the fire is being extinguished. This makes it possible to concentrate the heat inside a stove which would be, at that moment, with a focus almost closed by the plate 70. Other applications can then be envisaged for the chimney, for example using the plate 70 as a cooking medium for food.
  • the tubes 36 may be of non-circular section.
  • the number of structures comprising a chenet 32 associated with a tube 36 may vary. Indeed, we can adapt this system to fires more or less important, and more or less large areas. In the same way, it will be possible to place structures allowing the double combustion only in the center of the brazier. It will also be possible to integrate only one structure comprising an association of a chenet 32 and a vertical tube 36 in a chimney.
  • the structure of the receptacle 30 is not limiting, and the use of this structure itself is not mandatory. Indeed, the elementary structures consisting of a chenet 32 and a tube 36 may be held together by any means other than the structure of the receptacle 30 proposed here.
  • each chenet 32 comprises three nested tubes
  • the secondary air inlet in the chenet may be provided at the rear of the device. It will also be possible, in this case, to provide an additional portion of duct for this supply of air at the back of the device.
  • the sections of the various stages formed by the tubes in the andirons 32 will be provided more and more important from the center outwards, to cause the phenomena of expansion and compression of air mentioned above.
  • additional vertical tubes for example shorter than the tubes 36 to avoid impeding the loading of the wood, may be provided at the front of the device, the air flowing in these additional tubes being from a tube intermediate formed in the andirons.
  • the vertical tubes may also provide structures in which the vertical tubes are provided to be arranged not at the bottom of the hearth but on one or the walls thereof.
  • the elementary structure proposed here may be equipped with transfer ducts of the secondary air inlets to 1 'front of the chimney.
  • the tubes 36 have been presented here as consisting of independent cylinders. It will be noted that other structures may be provided for the tubes 36, and in particular to integrate these tubes in a block placed at the rear of the device. For example, it is possible to provide such a block in which vertical ducts are defined, openings for communication with the outer tube of each chenet and openings for extracting hot air at the level of the brazier being provided in this block.
  • FIGS. 9A and 9B respectively represent a view from above and a front view of a variant of an example of a device in which the tubes 36 are integrated with a bottom plate of the chimney, FIG. 9A being a sectional view according to the plan AA of Figure 9B.
  • a bottom plate of the chimney, shown partially, is designated 80.
  • the tubes 36 are defined by the cooperation between a fixed (eg brazed) plate at the rear of the chimney plate and this chimney plate.
  • a continuous sheet 82 is used.
  • a continuous sheet 82 is used.
  • the plate comprises slits 85 or aligned openings 86. Holes 88 in the plate 80 allow the assembly of the plate and tubular andirons.
  • tubes 36 having outlet openings 38 over their entire height it may be provided to form tubes 36 with openings 38 defined only at desired locations.
  • provision may be made not to define openings 38 in the tubes 36 facing the openings 60. It will also be possible not to define lateral openings in the tubes. 36, but simply to leave the upper end of each of the tubes 36 open, the extraction of air being then through this opening. A slight curvature of this end on the side of the brazier can then be provided.

Abstract

The invention relates to a device approximately defining an L shape and comprising at least two first nested pipes in the foot of the L (32), and at least one second pipe (36) provided with at least one opening (38), in the leg of the L, the first pipes being arranged in such a way as to define a duct between one end (34) of a first central pipe and said at least one opening (38) by means of passages defined at the ends of the first pipes.

Description

DISPOSITIF POUR AMELIORER LA COMBUSTION DANS UNE CHEMINEE  DEVICE FOR ENHANCING COMBUSTION IN A CHIMNEY
Domaine Field
La présente demande concerne un dispositif susceptible d'être intégré au sein d'une cheminée. Plus particulièrement, la présente demande concerne un tel dispositif permettant d'améliorer la combustion au sein d'une cheminée.  The present application relates to a device that can be integrated into a chimney. More particularly, the present application relates to such a device for improving combustion within a chimney.
Exposé de l'art antérieur Presentation of the prior art
De nombreux types de cheminées sont connus . Deux types principaux de cheminées peuvent être distingués : les cheminées à foyer fermé dans lesquelles le foyer est confiné dans une enceinte close, et les cheminées à foyer ouvert dans lesquelles au moins une paroi du foyer est en contact avec l'air libre.  Many types of chimneys are known. Two main types of chimneys can be distinguished: closed fireplaces in which the fireplace is confined in a closed enclosure, and open fireplaces in which at least one wall of the fireplace is in contact with the open air.
Des études ont montré que la combustion du bois produit une quantité significative d'émission de pollution, par exemple du monoxyde de carbone ou de particules fines qui peuvent être nocives pour la santé et pour l'environnement. Dans une cheminée à foyer ouvert, la température au sein du foyer de la cheminée n'est pas suffisante pour que l'ensemble de ces gaz volatils soient brûlés. Il se produit donc des combustions incomplètes .  Studies have shown that burning wood produces a significant amount of pollution, for example carbon monoxide or fine particles that can be harmful to health and the environment. In an open fireplace, the temperature in the fireplace is not sufficient for all of these volatile gases to be burned. Incomplete combustion occurs.
Dans le cas d'une cheminée à foyer fermé, la température élevée au sein du foyer permet de limiter ces émissions toxiques. En effet, au sein d'un foyer fermé, la température de combustion est généralement supérieure à 573°C, et il se produit une combustion plus complète que dans le cas d'un foyer ouvert, au cours de laquelle des éléments volatils nocifs pour l'environnement et pour la santé sont brûlés. In the case of a closed fireplace, the high temperature in the home can limit these toxic emissions. Indeed, in a closed home, the Combustion temperature is generally greater than 573 ° C, and more complete combustion occurs than in the case of an open fire, during which volatile elements harmful to the environment and health are burned.
Résumé summary
Un objet d'un mode de réalisation est de prévoir un dispositif susceptible d'être intégré au sein d'une cheminée et assurant la réalisation d'une double combustion.  An object of an embodiment is to provide a device that can be integrated within a chimney and ensuring the realization of a double combustion.
Ainsi, un mode de réalisation prévoit un dispositif définissant approximativement une forme de L et comportant, dans le pied du L, au moins deux premiers tubes imbriqués et, dans la branche du L, au moins un deuxième tube pourvu d'au moins une ouverture, les premiers tubes étant agencés pour définir un conduit entre une extrémité d'un premier tube central et la au moins une ouverture par l'intermédiaire de passages définis aux extrémités des premiers tubes.  Thus, an embodiment provides a device defining approximately a shape of L and having, in the foot of the L, at least two first nested tubes and, in the branch of the L, at least a second tube provided with at least one opening , the first tubes being arranged to define a conduit between an end of a first central tube and the at least one opening through defined passages at the ends of the first tubes.
Selon un mode de réalisation, le deuxième tube comprend plusieurs ouvertures latérales.  According to one embodiment, the second tube comprises a plurality of lateral openings.
Selon un mode de réalisation, le conduit parcourt l'ensemble du volume des premiers et deuxième tubes.  According to one embodiment, the conduit travels the entire volume of the first and second tubes.
Selon un mode de réalisation, les premiers et deuxième tubes sont à section circulaire.  According to one embodiment, the first and second tubes are circular in section.
Selon un mode de réalisation, les premiers et deuxième tubes sont en acier réfractaire, en acier inoxydable, en fonte, ou en un métal tel que le cuivre.  According to one embodiment, the first and second tubes are made of refractory steel, stainless steel, cast iron, or a metal such as copper.
Selon un mode de réalisation, les premiers tubes définissent des étages du conduit, les étages présentant une section croissante avec leur éloignement au centre des premiers tubes .  According to one embodiment, the first tubes define stages of the duct, the stages having an increasing section with their distance to the center of the first tubes.
Selon un mode de réalisation, la section d'un deuxième tube est inférieure à la section d'un étage extérieur.  According to one embodiment, the section of a second tube is smaller than the section of an external stage.
Selon un mode de réalisation, les axes des premiers tubes sont parallèles entre eux et coplanaires dans un plan passant par le deuxième tube, l'axe d'un premier tube d'une première section étant situé au-dessus de l'axe d'un premier tube d'une deuxième section si la première section est supérieure à la deuxième section. According to one embodiment, the axes of the first tubes are parallel to each other and coplanar in a plane passing through the second tube, the axis of a first tube of a first section being located above the axis of a first tube of a second section if the first section is greater than the second section.
Selon un mode de réalisation, le dispositif comprend en outre un troisième tube pourvu d'au moins une ouverture supplémentaire, le troisième tube étant parallèle au deuxième tube, étant situé à l'extrémité des premiers tubes opposée au deuxième tube, et s 'étendant depuis un premier tube inter¬ médiaire pour former un deuxième conduit. According to one embodiment, the device further comprises a third tube provided with at least one additional opening, the third tube being parallel to the second tube, being located at the end of the first tubes opposite to the second tube, and extending from a first tube inter ¬ médiaire to form a second conduit.
Selon un mode de réalisation, le dispositif comprend trois premiers tubes.  According to one embodiment, the device comprises three first tubes.
Un mode de réalisation prévoit en outre un bloc insérable dans une cheminée comprenant au moins un dispositif tel que proposé ci-dessus.  An embodiment further provides an insertable block in a chimney comprising at least one device as proposed above.
Selon un mode de réalisation, le bloc comprend au moins deux dispositifs tels que proposés ci-dessus définissant des conduits indépendants, les dispositifs étant maintenus en position à l'aide d'une armature comprenant quatre parois latérales .  According to one embodiment, the block comprises at least two devices as proposed above defining independent conduits, the devices being held in position by means of a frame comprising four side walls.
Selon un mode de réalisation, le bloc comprend en outre une plaque amovible susceptible d'être positionnée en surface de l'armature pour fermer le dessus de l'armature.  According to one embodiment, the block further comprises a removable plate capable of being positioned on the surface of the frame to close the top of the frame.
Selon un mode de réalisation, une paroi de l'armature comprend des ouvertures d'évacuation associées à un conduit d' évacuation .  According to one embodiment, a wall of the frame comprises discharge openings associated with a discharge duct.
Selon un mode de réalisation, le conduit d'évacuation est défini le long de l'armature, du côté des deuxièmes tubes. Brève description des dessins  According to one embodiment, the exhaust duct is defined along the armature, on the side of the second tubes. Brief description of the drawings
Ces caractéristiques et avantages, ainsi que d'autres, seront exposés en détail dans la description suivante de modes de réalisation particuliers faite à titre non limitatif en relation avec les figures jointes parmi lesquelles :  These and other features and advantages will be set forth in detail in the following description of particular embodiments in a non-limiting manner with reference to the accompanying drawings in which:
la figure 1 est une vue en perspective schématique d'un exemple de cheminée à foyer ouvert ;  Figure 1 is a schematic perspective view of an example of an open fireplace;
les figures 2 et 3 sont, respectivement, une vue en perspective et une vue en coupe d'un bloc selon un mode de réalisation ; la figure 4 est une vue en coupe agrandie illustrant une structure élémentaire d'un bloc selon un mode de réalisation ; Figures 2 and 3 are respectively a perspective view and a sectional view of a block according to one embodiment; Figure 4 is an enlarged sectional view illustrating an elementary structure of a block according to one embodiment;
les figures 5A et 5B illustrent des éléments de maintien d'une structure élémentaire selon un mode de réalisation ;  FIGS. 5A and 5B illustrate elements for maintaining an elementary structure according to one embodiment;
les figures 6, 7 et 8 sont, respectivement, deux vues en perspective et une vue en coupe d'une variante d'un dispositif selon un mode de réalisation ; et  Figures 6, 7 and 8 are, respectively, two perspective views and a sectional view of a variant of a device according to one embodiment; and
les figures 9A et 9B représentent respectivement une vue de dessus et une vue de face d'une variante d'un dispositif selon un mode de réalisation, la figure 9A étant une vue en coupe selon le plan A-A de la figure 9B.  Figures 9A and 9B respectively show a top view and a front view of a variant of a device according to one embodiment, Figure 9A being a sectional view along the plane A-A of Figure 9B.
Par souci de clarté, de mêmes éléments ont été désignés par de mêmes références aux différentes figures.  For the sake of clarity, the same elements have been designated with the same references in the various figures.
Description détaillée detailed description
La figure 1 illustre un exemple de cheminée dans laquelle est susceptible d'être inséré un bloc selon un mode de réalisation. La cheminée représentée en figure 1 est une cheminée à foyer ouvert, c'est-à-dire que le foyer n'est pas cloisonné par une enceinte fermée mais est créé dans une enceinte ouverte au moins sur un de ses côtés .  FIG. 1 illustrates an example of a chimney in which a block according to one embodiment can be inserted. The chimney shown in Figure 1 is an open fireplace, that is to say that the fireplace is not partitioned by a closed chamber but is created in an enclosure open at least on one of its sides.
On notera que le bloc améliorant la combustion proposé ici est également adapté à être intégré dans une cheminée à foyer fermé ou dans un poêle, pour améliorer encore la combustion d'éléments volatils nocifs qui seraient toujours présents au sein d'un tel dispositif.  Note that the combustion improving block proposed here is also adapted to be integrated into a closed fireplace or stove, to further improve the combustion of harmful volatile elements that would still be present within such a device.
En figure 1, la cheminée comprend un foyer 10, encore appelé âtre, fermé par un fond 12, des parois latérales 14, et un sol horizontal 16. Le haut de la cheminée est cloisonné par un avaloir 18 dont la section se réduit pour atteindre un conduit 20 d'évacuation des fumées.  In Figure 1, the chimney comprises a hearth 10, also called hearth, closed by a bottom 12, the side walls 14, and a horizontal floor 16. The top of the chimney is partitioned by a throat 18 whose section is reduced to reach a conduit 20 for evacuation of fumes.
Dans une cheminée classique, le sol 16 peut être recouvert de chenets, non représentés, sur lesquels sont disposées les bûches à brûler. Un système de récupération de cendres, non représenté, est généralement prévu au niveau du sol de la cheminée. In a conventional chimney, the floor 16 may be covered with andirons, not shown, on which are arranged fire logs. A system of recovery of ash, not shown, is generally provided at the floor level of the chimney.
Comme nous l'avons vu précédemment, dans une cheminée du type de celle de la figure 1, c'est-à-dire une cheminée à foyer ouvert, la température de combustion du bois est limitée par l'apport d'air frais du côté de l'ouverture de la cheminée. Notamment, dans une cheminée à foyer ouvert, la température au- dessus des flammes peut être inférieure à 573°C, ce qui permet seulement une combustion partielle : les éléments volatils nocifs dégagés lors de la combustion principale du bois (encore appelé combustion première) ne sont pas brûlés.  As we have seen previously, in a chimney of the type of that of Figure 1, that is to say an open fireplace, the combustion temperature of the wood is limited by the supply of fresh air from the side of the opening of the chimney. Notably, in an open fire, the temperature above the flames can be less than 573 ° C, which allows only partial combustion: harmful volatile elements released during the main combustion of wood (also called first combustion) are not burned.
On prévoit ici un dispositif susceptible d'être intégré dans une cheminée du type de la figure 1, mais également dans une cheminée à foyer fermé, permettant la réalisation d'une double combustion au sein du foyer, cette double combustion permettant la combustion d'au moins une partie des éléments nocifs issus de la première combustion. Par double combustion, ou encore post-combustion ou deuxième combustion, on entend ici une combustion qui est créée par une arrivée d'air neuf, l'air secondaire, au niveau des fumées, à une température suffisante pour que la combustion des gaz nocifs s'opère. En pratique, cette température est supérieure ou égale à 573 °C.  Here is provided a device capable of being integrated into a chimney of the type of Figure 1, but also in a closed fireplace, allowing the realization of a double combustion in the home, this dual combustion for the combustion of at least a part of the harmful elements from the first combustion. By double combustion, or after-combustion or second combustion, is meant here a combustion which is created by an intake of fresh air, the secondary air, at the level of the fumes, at a temperature sufficient for the combustion of harmful gases takes place. In practice, this temperature is greater than or equal to 573 ° C.
La figure 2 est une vue en perspective d'un tel dispositif insérable au sein du foyer d'une cheminée.  Figure 2 is a perspective view of such an insertable device within the fireplace of a fireplace.
Le dispositif de la figure 2 comprend un bac 30 délimitant un volume dans lequel les bûches à brûler seront posées. Ce bac 30 comprend par exemple quatre parois latérales. Le fond du bac 30 est délimité par un ensemble d'éléments horizontaux 32 jouant le rôle de chenets. Les chenets 32 s'étendent entre l'avant et l'arrière du bac 30, c'est-à-dire qu'ils seront placés entre l'avant et l'arrière du foyer de la cheminée en utilisation. Les chenets sont constitués, comme nous le verrons par la suite, de plusieurs tubes, par exemple cylindriques, imbriqués et communiquant entre eux.  The device of Figure 2 comprises a tray 30 defining a volume in which the fire logs will be placed. This tray 30 comprises for example four side walls. The bottom of the tank 30 is delimited by a set of horizontal elements 32 acting as andirons. The andirons 32 extend between the front and rear of the tank 30, that is to say they will be placed between the front and the back of the fireplace fireplace in use. The andirons are constituted, as we shall see later, several tubes, for example cylindrical, nested and communicating with each other.
Des ouvertures 34 sont définies sur la face avant du réceptacle 30, ces ouvertures correspondant à l'extrémité des tubes centraux de chacun des chenets 32. Chaque élément de plus forte section de chacun des chenets 32 est connecté, à l'arrière du dispositif, c'est-à-dire dans la partie qui sera disposée au fond du foyer de la cheminée, à un tube vertical 36. Les tubes verticaux 36 comprennent un ensemble d'ouvertures 38 définies de préférence latéralement et du côté du foyer. Openings 34 are defined on the front face of the receptacle 30, these openings corresponding to the end of the central tubes of each of the andirons 32. Each element of greater section of each of the andirons 32 is connected to the rear of the device, that is to say in the part which will be arranged at the bottom of the hearth of the chimney, to a vertical tube 36. The vertical tubes 36 comprise a set of openings 38 preferably defined laterally and on the side of the hearth.
Dans l'ensemble de cette description, on parlera de chenets 32 horizontaux et de tubes 36 verticaux. On notera que ces directions horizontales et verticales doivent être inter- prêtées comme étant en réalité sensiblement horizontale et sensiblement verticale, à savoir avec une tolérance de 10° par rapport à l'axe horizontal et par rapport à l'axe vertical. Ainsi, l'angle formé entre la génératrice de chaque chenet 32 et la génératrice du tube 36 pourra varier entre 70° et 110°. En outre, la forme générale, dans leurs longueurs, des chenets 32 et des tubes 36 pourra varier légèrement par rapport à une forme rectiligne. Enfin, lorsque des applications numériques seront proposées dans la suite de la description, chacune des valeurs indiquées devra être considérée comme étant donnée à 10 ~6 pres .  Throughout this description, we will speak of andirons 32 horizontal and vertical tubes 36. It should be noted that these horizontal and vertical directions must be interpreted as actually being substantially horizontal and substantially vertical, ie with a tolerance of 10 ° with respect to the horizontal axis and with respect to the vertical axis. Thus, the angle formed between the generator of each chenet 32 and the generatrix of the tube 36 may vary between 70 ° and 110 °. In addition, the overall shape, in their lengths, andirons 32 and tubes 36 may vary slightly compared to a rectilinear shape. Finally, when digital applications will be proposed in the following description, each of the values indicated should be considered as being given to 10 ~ 6 pres.
Le bloc insérable proposé ici comprend un ensemble de structures élémentaires indépendantes constituées chacune d'un chenet 32 et d'un tube vertical 36 maintenus en position l'un par rapport à l'autre. Dans chacune de ces structures élémentaires, le chenet 32 joue le rôle d'un échangeur à contre courant air-braise de façon que de l'air, inséré par l'ouverture The insertable block proposed here comprises a set of independent elementary structures each consisting of a chenet 32 and a vertical tube 36 held in position relative to each other. In each of these elementary structures, the chenet 32 plays the role of a counter-current exchanger air-ember so that air, inserted through the opening
34, soit réchauffé à l'aide des braises formées par les bûches posées sur les chenets 32. L'air réchauffé passe ensuite au travers d'un moyen de communication entre chacun des chenets 32 et chacun des tubes verticaux 36, jusqu'à atteindre les ouvertures 38 et être réinjecté au niveau du feu formé dans le foyer. 34, is heated with the embers formed by the logs placed on the andirons 32. The heated air then passes through a means of communication between each of the andirons 32 and each of the vertical tubes 36, until reaching the openings 38 and be reinjected at the level of the fire formed in the fireplace.
Avantageusement, l'air secondaire réchauffé au sein des chenets 32 et des tubes 36 est renvoyé au niveau du haut des flammes, par l'intermédiaire des ouvertures 38, à une température suffisante pour que le mélange entre cet air et les gaz issus des flammes du feu présents au niveau des ouvertures 38 soit à une température supérieure à 573°C. Ainsi, l'injection d'un air secondaire par l'intermédiaire du conduit formé entre les ouvertures 34 et 38 permet de réaliser une double combustion au niveau des ouvertures 38, et ainsi de brûler les gaz nocifs qui se dégagent de la première combustion et qui n'ont pas été brûlés au niveau des flammes. Pour pouvoir atteindre une température suffisante, les inventeurs ont constaté qu'il fallait prévoir au moins un double passage, et de préférence un triple passage, de l'air secondaire sur la longueur des chenets, un simple passage ne permettant pas de préchauffer suffisamment l'air secondaire pour réduire la pollution. Advantageously, the secondary air heated within the andirons 32 and tubes 36 is returned to the top of the flames, through the openings 38, at a temperature sufficient for the mixture between this air and the gases from the flames fire present at the openings 38 at a temperature above 573 ° C. Thus, the injection of secondary air via the duct formed between the openings 34 and 38 makes it possible to perform a double combustion at the openings 38, and thus to burn off the harmful gases which are released from the first combustion and who were not burned at the flames. To be able to reach a sufficient temperature, the inventors have found that it is necessary to provide at least a double passage, and preferably a triple passage, of the secondary air along the length of the andirons, a simple passage not allowing sufficient preheating of the secondary air to reduce pollution.
Les chenets 32 sont de préférence agencés de façon qu'un espace les sépare pour que des cendres formées pendant la combustion du bois tombent dans un réceptacle de récupération de cendres placé en-dessous du dispositif (non représenté) . A titre d'exemple, pour assurer cette fonction, l'espace entre les chenets 32 peut être compris entre 5 et 20 mm, de préférence de 10 mm. Un tel écart permet de maintenir les braises chaudes au- dessus des chenets 32, tout en permettant l'évacuation des cendres vers le bas.  The andirons 32 are preferably arranged so that a space separates them so that ashes formed during the burning of the wood fall into an ash collection receptacle placed beneath the device (not shown). For example, to ensure this function, the space between the andirons 32 may be between 5 and 20 mm, preferably 10 mm. Such a gap keeps hot embers above the fender 32, while allowing the evacuation of ash down.
On notera que chaque système comprenant une asso¬ ciation d'un chenet 32 et d'un tube vertical 36 fonctionne de façon indépendante et définit un conduit d'amenée d'air indépendant. Ainsi, l'air secondaire chauffé au niveau des chenets est réparti sur chacun des tubes verticaux 36, ce qui assure la réalisation d'une double combustion sur une surface importante du fond de la cheminée. Note that each system comprising a asso ciation ¬ a grate 32 and a vertical tube 36 functions independently and defines a conduit for supplying air independent. Thus, the secondary air heated at the level of the andirons is distributed on each of the vertical tubes 36, which ensures the realization of a double combustion on a large surface of the bottom of the chimney.
La figure 3 est une vue en coupe d'avant en arrière du dispositif de la figure 2. Dans cette figure, la structure des chenets 32 et leur association avec les tubes verticaux 36 sont représentées plus en détail . La figure 4 reprend, de façon isolée et agrandie, uniquement cette association.  Figure 3 is a sectional front-to-back view of the device of Figure 2. In this figure, the structure of the andirons 32 and their association with the vertical tubes 36 are shown in more detail. Figure 4 shows, in isolation and enlarged, only this association.
Comme on peut le voir en figures 3 et 4, chaque chenet 32 est constitué d'un ensemble de tubes imbriqués. Dans l'exemple représenté, trois tubes imbriqués sont représentés, mais on notera que moins ou plus que trois tubes pourront être utilisés, de préférence un nombre impair de tubes pour faciliter l'entrée d'air. Dans cet exemple, le chenet 32 comprend un premier tube central 40, un deuxième tube intermédiaire 42, et un tube extérieur 44. As can be seen in Figures 3 and 4, each chenet 32 consists of a set of nested tubes. In the example shown, three nested tubes are shown, but it will be noted that less than or more than three tubes may be used, preferably an odd number of tubes to facilitate the entry of air. In this example, the chenet 32 comprises a first central tube 40, a second intermediate tube 42, and an outer tube 44.
Le tube central 40 a une extrémité située à l'avant du dispositif qui correspond avec l'ouverture 34 du bac 30. A l'autre extrémité du tube central 40, au fond du dispositif, sont prévues des ouvertures latérales 46 qui permettent à l'air de circuler depuis le tube central 40 vers le tube intermédiaire 42. Le fond du tube central 40 est dans ce cas fermé. De préférence, les ouvertures latérales 46 sont situées au fond du tube 40, c'est-à-dire à l'opposé de l'ouverture 34, pour que l'air circule tout le long du tube central 40 avant de passer dans le tube intermédiaire 42. A l'avant du dispositif, c'est-à- dire du côté des ouvertures 40, le tube intermédiaire 42 comprend des ouvertures latérales 48 qui permettent à l'air de circuler depuis le tube intermédiaire 42 vers le tube extérieur 44. L'extrémité avant du tube 42 est dans ce cas fermée.  The central tube 40 has an end located at the front of the device which corresponds with the opening 34 of the container 30. At the other end of the central tube 40, at the bottom of the device, lateral openings 46 are provided which allow the air from the central tube 40 to the intermediate tube 42. The bottom of the central tube 40 is in this case closed. Preferably, the lateral openings 46 are located at the bottom of the tube 40, that is to say opposite the opening 34, so that the air circulates all along the central tube 40 before passing into the intermediate tube 42. At the front of the device, that is to say on the side of the openings 40, the intermediate tube 42 comprises lateral openings 48 which allow air to flow from the intermediate tube 42 to the outer tube 44. The front end of the tube 42 is in this case closed.
Le tube vertical 36 est prévu pour s'imbriquer dans le tube extérieur 44, au fond de celui-ci (côté ouvertures 46) de façon à former un assemblage hermétique. En fonction de l'assemblage des tubes 44 et 36, des ouvertures 49 peuvent être prévues alternativement soit dans le tube 44 soit dans le tube 36 pour permettre à l'air de circuler entre ces deux tubes.  The vertical tube 36 is provided to nest in the outer tube 44 at the bottom thereof (side openings 46) so as to form a hermetic assembly. Depending on the assembly of the tubes 44 and 36, openings 49 may be provided alternately either in the tube 44 or in the tube 36 to allow air to flow between these two tubes.
Ainsi, le dispositif définit un conduit hermétique entre le point d'entrée d'air 34 et les ouvertures latérales 38 formées dans le tube vertical 36.  Thus, the device defines a hermetic conduit between the air inlet point 34 and the lateral openings 38 formed in the vertical tube 36.
De préférence, les axes des tubes 40, 42 et 44 sont prévus comme étant parallèles et coplanaires dans un plan passant par le tube vertical 36, l'axe d'un tube extérieur étant situé au-dessus de l'axe d'un tube intérieur. Cela assure des échanges thermiques avec le brasier de bonne qualité.  Preferably, the axes of the tubes 40, 42 and 44 are provided as being parallel and coplanar in a plane passing through the vertical tube 36, the axis of an outer tube being located above the axis of a tube inside. This ensures heat exchange with the brazier of good quality.
On notera que l'assemblage proposé ici pour les tubes 40, 42 et 44 n'est qu'un exemple, et que d'autres assemblages permettant la réalisation de la même fonction, c'est-à-dire de définir un conduit entre une extrémité d'un chenet 32 et des ouvertures définies dans les tubes verticaux en serpentant dans les différents tubes, pourront être prévus. Notamment, on pourra prévoir des tubes 40 et 42 légèrement moins longs que la longueur des chenets 32 et maintenus par l'une de leurs extrémités, de façon que l'air circule entre les tubes par l'intermédiaire des extrémités libres des tubes 40 et 42 (du côté opposé au système de maintien des tubes) . Note that the assembly proposed here for the tubes 40, 42 and 44 is only one example, and that other assemblies allowing the realization of the same function, that is to say to define a conduit between one end of a chenet 32 and openings defined in the vertical tubes by snaking in the different tubes, may be provided. In particular, may be provided tubes 40 and 42 slightly shorter than the length of the andirons 32 and held by one of their ends, so that the air flows between the tubes via the free ends of the tubes 40 and 42 (on the opposite side to the tube holding system).
En utilisation, des bûches sont placées en surface des chenets 32. Avantageusement, cette disposition permet de former une zone très chaude en surface des chenets 32, ce qui réchauffe l'air circulant dans le conduit formé entre l'entrée 34 et les sorties 38, et tout d'abord l'air dans l'étage défini entre le tube extérieur 44 et le tube intermédiaire 42. Les tubes 40, 42 et 44 définissent dans les chenets 32 des échangeurs à contre- courant. Avantageusement, il s'opère dans les chenets 32 une convection naturelle de l'air du fait de ces échanges thermiques .  In use, logs are placed on the surface of the andirons 32. Advantageously, this arrangement makes it possible to form a very hot zone on the surface of the andirons 32, which heats the air circulating in the duct formed between the inlet 34 and the outlets 38 , and first of all the air in the stage defined between the outer tube 44 and the intermediate tube 42. The tubes 40, 42 and 44 define in the fluggers 32 counter-current heat exchangers. Advantageously, it operates in the andirons 32 a natural convection of air due to these heat exchanges.
En outre, pour améliorer les échanges thermiques dans l'échangeur à contre-courant 32, on prévoit d'imbriquer les tubes 40, 42 et 44 de façon que leurs axes centraux ne soient pas confondus, le centre du tube central 40 étant situé plus bas que le centre du tube intermédiaire 42, et le centre du tube intermédiaire 42 étant situé plus bas que le centre du tube extérieur 44.  In addition, to improve the heat exchange in the countercurrent exchanger 32, it is expected to nest the tubes 40, 42 and 44 so that their central axes are not merged, the center of the central tube 40 being located more lower than the center of the intermediate tube 42, and the center of the intermediate tube 42 being located lower than the center of the outer tube 44.
De plus, on prévoit de préférence que la section du tube central 40 (premier étage) soit inférieure à celle du deuxième étage (section interne du tube 42 moins section externe du tube 40), et que cette dernière soit inférieure à la section du troisième étage (section interne du tube 44 moins section externe du tube 42) . Cela permet de réaliser une détente entre chaque étage, ce qui provoque un ralentissement du flux d'air entre les différents tubes et permet d'emmagasiner une plus grande quantité d'énergie calorifique dans les échanges thermiques avec le brasier. Une compression de l'air se produit en outre en entrée du conduit, au niveau de l'ouverture 34. En outre, la section du tube vertical sera de préférence inférieure à la section du troisième étage de façon qu'il se crée, en entrée du tube 36 une compression et donc une nouvelle accélération du flux d'air avant de rentrer en contact avec les gaz combustibles imbrûlés pour provoquer la double combustion au niveau des ouvertures 38. Cette configuration aide avantageusement à améliorer la convection naturelle de l'air entre l'entrée 34 et les ouvertures de sortie 38. In addition, it is preferably provided that the section of the central tube 40 (first stage) is smaller than that of the second stage (inner section of the tube 42 minus outer section of the tube 40), and that the latter is smaller than the section of the third stage (inner section of tube 44 minus outer section of tube 42). This allows a relaxation between each stage, which causes a slowing of the air flow between the different tubes and allows to store a greater amount of heat energy in the heat exchange with the brazier. Air compression also occurs at the inlet of the duct at the opening 34. In addition, the cross section of the vertical tube will preferably be smaller than the section of the third stage so that it is created at the inlet of the tube 36 a compression and therefore a new acceleration of the air flow before coming into contact with the unburnt combustible gases to cause double combustion at the openings 38. This configuration advantageously helps to improve the natural convection of air between the inlet 34 and the outlet openings 38.
A titre d'exemple d'application numérique, le tube central 40 pourra avoir un diamètre interne égal à 9,5 mm et une épaisseur de 2 mm (section du premier étage égale à 70,9 mm2), le tube intermédiaire pourra avoir un diamètre interne égal à 17,3 mm et une épaisseur égale à 2 mm (section du deuxième étage égale à 92 mm2), le tube extérieur 44 pourra avoir un diamètre interne égal à 36 mm et une épaisseur de 2 mm (section du troisième étage égale à 661,6 mm2), et le tube vertical 36 pourra avoir un diamètre interne égal à 9, 5 mm et une épaisseur de 2 mm, c'est-à-dire une section de ce tube de l'ordre de 70, 9 mm2. As an example of digital application, the central tube 40 may have an internal diameter equal to 9.5 mm and a thickness of 2 mm (section of the first stage equal to 70.9 mm 2 ), the intermediate tube may have an internal diameter equal to 17.3 mm and a thickness equal to 2 mm (section of the second stage equal to 92 mm 2 ), the outer tube 44 may have an internal diameter equal to 36 mm and a thickness of 2 mm (section of the third stage equal to 661.6 mm 2 ), and the vertical tube 36 may have an internal diameter equal to 9.5 mm and a thickness of 2 mm, that is to say a section of this tube of the order 70, 9 mm 2 .
Les ouvertures 46 définies entre le premier étage et le deuxième étage (définies dans le tube 40) pourront avoir une section égale à 84,8 mm2, les ouvertures 48 entre le deuxième étage et le troisième étage (définies dans le tube 42) pourront avoir une section égale à 115,5 mm2, et les ouvertures 49 entre le troisième étage et le tube vertical (définies par exemple dans la portion du tube vertical 36 qui pénètre dans le tube extérieur 44) pourront avoir une section égale à 70,9 mm2. Les ouvertures latérales 38 définies sur la hauteur du tube 36 pourront être réalisées par perçage, et présenter un diamètre compris entre 3 et 6 mm. On notera que l'ouverture 34 sera avantageusement prévue du même diamètre que le diamètre interne du tube central 40. The openings 46 defined between the first stage and the second stage (defined in the tube 40) may have a section equal to 84.8 mm 2 , the openings 48 between the second stage and the third stage (defined in the tube 42) may have a section equal to 115.5 mm 2 , and the openings 49 between the third stage and the vertical tube (defined for example in the portion of the vertical tube 36 which enters the outer tube 44) may have a section equal to 70, 9 mm 2 . The lateral openings 38 defined on the height of the tube 36 may be made by drilling, and have a diameter of between 3 and 6 mm. It will be noted that the opening 34 will advantageously be provided with the same diameter as the internal diameter of the central tube 40.
A titre d'exemple de matériau, le tube extérieur 44 et le tube vertical 36 pourront être, pour être compatibles avec le contact direct avec le brasier, en acier réfractaire ou inoxydable. Les tubes 40 et 42 pourront également être en acier réfractaire, ou encore en acier inoxydable. Dans tous les cas, les tubes, principalement ceux en contact avec le brasier, seront en un matériau supportant des températures importantes et présentant une conductivité thermique élevée, par exemple en fonte ou en un métal tel que du cuivre. As an example of material, the outer tube 44 and the vertical tube 36 may be, to be compatible with the direct contact with the brazier, refractory steel or stainless steel. The tubes 40 and 42 can also be made of steel refractory, or stainless steel. In all cases, the tubes, mainly those in contact with the brazier, will be of a material with high temperatures and high thermal conductivity, for example cast iron or a metal such as copper.
Les parois du réceptacle 30 sont de préférence réalisées en un matériau isolant, par exemple en vermiculite.  The walls of the receptacle 30 are preferably made of an insulating material, for example vermiculite.
Les figures 5A et 5B illustrent une réalisation pratique de manchons destinés à être positionnés à l'avant et à l'arrière des chenets 32 de façon à maintenir les différents tubes 40, 42, 44 en position. Dans cet exemple, on considère des tubes 40, 42 et 44 de section circulaire.  FIGS. 5A and 5B illustrate a practical embodiment of sleeves intended to be positioned at the front and at the rear of the andirons 32 so as to hold the different tubes 40, 42, 44 in position. In this example, tubes 40, 42 and 44 of circular section are considered.
En figures 5A et 5B, un manchon avant 50 (figure 5A) est prévu sur la partie avant du chenet 32, par exemple de façon solidaire avec le réceptacle 30, et un manchon arrière 52 (figure 5B) est prévu sur la partie arrière du réceptacle 30 de façon à maintenir les tubes 40, 42 et 44 en position. Le manchon avant 50 présente une ouverture de même diamètre que l'ouverture 34, destinée à être positionnée en regard de l'ouverture 34. Le manchon 52 est quant à lui hermétique. En regard de l'ouverture 34, le manchon arrière présente une portion circulaire 53 en surépaisseur. Des portions en surépaisseur en forme de croissant de lune 54 et 55, de plus en plus grosses, sont formées sur les surfaces en regard des manchons 50 et 52. Le tube central 40 est maintenu en position entre les surépaisseurs 53 et 54, le tube intermédiaire 42 est maintenu en position entre les surépaisseurs 54 et 55, et le tube extérieur est maintenu en position autour des surépaisseurs 55.  In FIGS. 5A and 5B, a front sleeve 50 (FIG. 5A) is provided on the front part of the chenet 32, for example integral with the receptacle 30, and a rear sleeve 52 (FIG. 5B) is provided on the rear part of the receptacle 30 so as to maintain the tubes 40, 42 and 44 in position. The front sleeve 50 has an opening of the same diameter as the opening 34, intended to be positioned opposite the opening 34. The sleeve 52 is hermetically sealed. Opposite the opening 34, the rear sleeve has a circular portion 53 in extra thickness. Larger portions in the form of a crescent moon 54 and 55, larger and larger, are formed on the facing surfaces of the sleeves 50 and 52. The central tube 40 is held in position between the extra thicknesses 53 and 54, the tube intermediate 42 is held in position between the extra thicknesses 54 and 55, and the outer tube is held in position around the extra thicknesses 55.
On pourra prévoir, du côté de l'extérieur des manchons 50 et 52, une surépaisseur ou une sous-épaisseur pour assurer le maintien des manchons dans le réceptacle 30. Notamment, on pourra prévoir que les éléments de maintien des manchons assurent un positionnement correct de ceux-ci, et donc des tubes 40, 42 et 44 (de façon à assurer des échanges thermiques importants avec le brasier) . D'autres structures de maintien des tubes 40, 42 et 44 (qui ne sont pas forcément à section circulaire) au sein des chenets 32 pourront être prévues. May be provided, on the outside of the sleeves 50 and 52, an extra thickness or a sub-thickness to ensure the maintenance of the sleeves in the receptacle 30. In particular, it can be provided that the sleeve holding elements ensure correct positioning of these, and therefore tubes 40, 42 and 44 (so as to ensure significant heat exchange with the brazier). Other structures for holding the tubes 40, 42 and 44 (which are not necessarily circular in section) within the andirons 32 may be provided.
La figure 6 illustre une variante de réalisation du bloc insérable dans une cheminée de la figure 2. Dans cette variante, des ouvertures 60 sont formées dans la partie arrière du réceptacle 30, au-dessus des chenets 32. Une pièce arrière 62 est placée à l'arrière des ouvertures 60 pour former un conduit 64 entre ces ouvertures 60 et la partie haute de la cheminée. La structure des ouvertures 60 et de la pièce 62 permet une évacuation des fumées issues du feu par le conduit 64. Cette variante est tout particulièrement avantageuse dans un cas où l'on souhaite fermer le dispositif de la figure 2.  FIG. 6 illustrates an alternative embodiment of the insertable block in a chimney of FIG. 2. In this variant, openings 60 are formed in the rear part of the receptacle 30, above the andirons 32. A rear piece 62 is placed at the back of the openings 60 to form a duct 64 between these openings 60 and the upper part of the chimney. The structure of the openings 60 and of the part 62 allows evacuation of the fumes from the fire via the duct 64. This variant is particularly advantageous in a case where it is desired to close the device of FIG.
En figures 6 et 7, les manchons avant 50 sont visibles sur l'avant du réceptacle 30.  In FIGS. 6 and 7, the front sleeves 50 are visible on the front of the receptacle 30.
Les figures 7 et 8 illustrent cet état, respectivement en perspective et en vue en coupe. Dans cet état, une plaque amovible 70 est placée au-dessus du brasier de façon à fermer hermétiquement le réceptacle 30. Les fumées issues de la combustion sont alors évacuées par les ouvertures 60 vers le conduit 64, et sont redirigées par ce conduit vers l'avaloir 18 de la cheminée.  Figures 7 and 8 illustrate this state, respectively in perspective and in sectional view. In this state, a removable plate 70 is placed above the brazier so as to seal the receptacle 30. The smoke from the combustion are then discharged through the openings 60 to the conduit 64, and are redirected by this conduit to the duct 18 of the chimney.
Avantageusement, la fermeture du réceptacle 30 par la plaque 70 peut être réalisée en fin de combustion, lorsque le feu est en cours d'extinction. Ceci permet de concentrer la chaleur à l'intérieur d'un poêle qui serait, à ce moment-là, à foyer quasi fermé par la plaque 70. On peut alors en outre prévoir d'autres applications à la cheminée, par exemple utiliser la plaque 70 comme moyen de cuisson pour des aliments.  Advantageously, the closing of the receptacle 30 by the plate 70 can be performed at the end of combustion, when the fire is being extinguished. This makes it possible to concentrate the heat inside a stove which would be, at that moment, with a focus almost closed by the plate 70. Other applications can then be envisaged for the chimney, for example using the plate 70 as a cooking medium for food.
Dans le cas d'une utilisation telle que celle proposée en figures 6, 7 et 8, on pourra prévoir, dans l'avaloir 20 de la cheminée, un système de trappe permettant d'éviter que des fumées sortant par le conduit 64 ne soient ramenées dans la pièce de vie. Pour cela, des systèmes classiques de trappe intégrés dans la cheminée pourront être utilisés. Des modes de réalisation particuliers ont été décrits. Diverses variantes et modifications apparaîtront à l'homme de l'art. En particulier, on notera que la forme cylindrique des chenets 32 et des tubes 40, 42, et 44 n'est pas limitative. En effet, ces éléments pourront avoir d'autres sections, par exemple rectangulaire, triangulaire, hexagonale ou autre, et pas forcément de même forme de section entre eux. En effet, seul le rapport entre les sections des différents éléments, et le positionnement relatif de ceux-ci, a une influence sur l'efficacité du dispositif. In the case of a use such as that proposed in FIGS. 6, 7 and 8, it will be possible to provide, in the duct 20 of the chimney, a trap system making it possible to prevent fumes exiting via line 64 from being brought back to the living room. For this, conventional trap systems integrated in the chimney can be used. Particular embodiments have been described. Various variations and modifications will be apparent to those skilled in the art. In particular, it will be noted that the cylindrical form of the andirons 32 and tubes 40, 42 and 44 is not limiting. Indeed, these elements may have other sections, for example rectangular, triangular, hexagonal or other, and not necessarily the same form of section between them. Indeed, only the ratio between the sections of the different elements, and the relative positioning thereof, has an influence on the effectiveness of the device.
De la même façon, les tubes 36 pourront être de section non circulaire. En outre, le nombre de structures comprenant un chenet 32 associé à un tube 36 pourra varier. En effet, on pourra adapter ce système à des feux plus ou moins importants, et de plus ou moins grandes surfaces. De la même façon, on pourra prévoir de placer des structures permettant la double combustion seulement au centre du brasier. On pourra également prévoir de n'intégrer qu'une seule structure comprenant une association d'un chenet 32 et d'un tube vertical 36 dans une cheminée.  In the same way, the tubes 36 may be of non-circular section. In addition, the number of structures comprising a chenet 32 associated with a tube 36 may vary. Indeed, we can adapt this system to fires more or less important, and more or less large areas. In the same way, it will be possible to place structures allowing the double combustion only in the center of the brazier. It will also be possible to integrate only one structure comprising an association of a chenet 32 and a vertical tube 36 in a chimney.
En outre, la structure du réceptacle 30 n'est pas limitative, et l'utilisation même de cette structure n'est pas obligatoire. En effet, les structures élémentaires constituées d'un chenet 32 et d'un tube 36 pourront être maintenues entre elles par tout autre moyen que par la structure du réceptacle 30 proposée ici.  In addition, the structure of the receptacle 30 is not limiting, and the use of this structure itself is not mandatory. Indeed, the elementary structures consisting of a chenet 32 and a tube 36 may be held together by any means other than the structure of the receptacle 30 proposed here.
Enfin, bien que 1 ' on ait présenté ici un système dans lequel chaque chenet 32 comprend trois tubes imbriqués, on pourra prévoir plus de trois tubes, voire même deux tubes. En effet, on pourra prévoir une structure de chenet comprenant deux tubes imbriqués si celle-ci suffit à chauffer l'air secondaire à une température propre à impliquer la seconde combustion. Dans le cas d'une structure à deux tubes imbriqués, l'entrée d'air secondaire dans le chenet pourra être prévue à 1 ' arrière du dispositif. On pourra également, dans ce cas, prévoir une portion de conduit supplémentaire permettant cette amenée d'air à l'arrière du dispositif. Dans tous les cas, les sections des différents étages formés par les tubes dans les chenets 32 seront prévues de plus en plus importantes du centre vers l'extérieur, pour provoquer les phénomènes de détente et de compression de l'air mentionnés ci-dessus. Finally, although there has been presented here a system in which each chenet 32 comprises three nested tubes, it will be possible to provide more than three tubes, or even two tubes. Indeed, we can provide a structure of chenet comprising two nested tubes if it is sufficient to heat the secondary air at a temperature to involve the second combustion. In the case of a structure with two nested tubes, the secondary air inlet in the chenet may be provided at the rear of the device. It will also be possible, in this case, to provide an additional portion of duct for this supply of air at the back of the device. In all cases, the sections of the various stages formed by the tubes in the andirons 32 will be provided more and more important from the center outwards, to cause the phenomena of expansion and compression of air mentioned above.
On pourra également prévoir des sorties d'air secondaire chaud supplémentaires à l'avant du dispositif. Dans ce cas, des tubes verticaux supplémentaires, par exemple moins long que les tubes 36 pour ne pas gêner le chargement du bois, pourront être prévus à l'avant du dispositif, l'air circulant dans ces tubes supplémentaires étant issus d'un tube intermédiaire formé dans les chenets.  It will also be possible to provide additional hot secondary air outlets at the front of the device. In this case, additional vertical tubes, for example shorter than the tubes 36 to avoid impeding the loading of the wood, may be provided at the front of the device, the air flowing in these additional tubes being from a tube intermediate formed in the andirons.
On pourra également prévoir des structures dans lesquelles les tubes verticaux sont prévus pour être disposés non pas au fond de l'âtre mais sur une ou les parois de celui- ci. Dans ce cas, la structure élémentaire proposée ici pourra être équipée de conduits de report des entrées d'air secondaire vers 1 ' avant de la cheminée .  It may also provide structures in which the vertical tubes are provided to be arranged not at the bottom of the hearth but on one or the walls thereof. In this case, the elementary structure proposed here may be equipped with transfer ducts of the secondary air inlets to 1 'front of the chimney.
De plus, les tubes 36 ont été présentés ici comme étant constitués de cylindres indépendants. On notera que l'on pourra prévoir d'autres structures pour les tubes 36, et notamment d'intégrer ces tubes dans un bloc placé à l'arrière du dispositif. On pourra par exemple prévoir un tel bloc dans lequel des conduits verticaux sont définis, des ouvertures de communication avec le tube externe de chaque chenet et des ouvertures pour l'extraction d'air chaud au niveau du brasier étant prévues dans ce bloc.  In addition, the tubes 36 have been presented here as consisting of independent cylinders. It will be noted that other structures may be provided for the tubes 36, and in particular to integrate these tubes in a block placed at the rear of the device. For example, it is possible to provide such a block in which vertical ducts are defined, openings for communication with the outer tube of each chenet and openings for extracting hot air at the level of the brazier being provided in this block.
Les figures 9A et 9B représentent respectivement une vue de dessus et une vue de face d'une variante d'un exemple de dispositif dans lequel les tubes 36 sont intégrés à une plaque de fond de cheminée, la figure 9A étant une vue en coupe selon le plan A-A de la figure 9B. Une plaque de fond de cheminée, représentée partiellement, est désignée par la référence 80. Les tubes 36 sont définis par la coopération entre une tôle fixée (par exemple brasée) à l'arrière de la plaque de cheminée et cette plaque de cheminée. Selon une première variante, illustrée a gauche de la figure 9A, on utilise une tole continue 82. Selon une première variante, illustrée à gauche de la figure 9A, on utilise une tôle continue 82. Selon une deuxième variante, illustrée à droite de la figure 9A, on utilise une série de tôles pliées 83. Pour définir les ouvertures 38, la plaque comprend des fentes 85 ou des ouvertures alignées 86. Des orifices 88 dans la plaque 80 permettent l'assemblage de la plaque et des chenets tubulaires. FIGS. 9A and 9B respectively represent a view from above and a front view of a variant of an example of a device in which the tubes 36 are integrated with a bottom plate of the chimney, FIG. 9A being a sectional view according to the plan AA of Figure 9B. A bottom plate of the chimney, shown partially, is designated 80. The tubes 36 are defined by the cooperation between a fixed (eg brazed) plate at the rear of the chimney plate and this chimney plate. According to a first variant, illustrated On the left of FIG. 9A, a continuous sheet 82 is used. According to a first variant, illustrated on the left of FIG. 9A, a continuous sheet 82 is used. According to a second variant, illustrated on the right of FIG. In order to define the openings 38, the plate comprises slits 85 or aligned openings 86. Holes 88 in the plate 80 allow the assembly of the plate and tubular andirons.
Enfin, bien que l'on ait représenté des tubes 36 présentant des ouvertures de sortie 38 sur toute leur hauteur, on pourra prévoir de former des tubes 36 avec des ouvertures 38 définies seulement en des emplacements désirés. Notamment, dans le cas de la variante des figures 6 à 8, on pourra prévoir de ne pas définir d'ouvertures 38 dans les tubes 36 en regard des ouvertures 60. On pourra également prévoir de ne pas définir d'ouvertures latérales dans les tubes 36, mais simplement de laisser l'extrémité haute de chacun des tubes 36 ouverte, l'extraction de l'air se faisant alors par cette ouverture. Une légère courbure de cette extrémité du côté du brasier pourra alors être prévue.  Finally, although there are shown tubes 36 having outlet openings 38 over their entire height, it may be provided to form tubes 36 with openings 38 defined only at desired locations. In particular, in the case of the variant of FIGS. 6 to 8, provision may be made not to define openings 38 in the tubes 36 facing the openings 60. It will also be possible not to define lateral openings in the tubes. 36, but simply to leave the upper end of each of the tubes 36 open, the extraction of air being then through this opening. A slight curvature of this end on the side of the brazier can then be provided.
Divers modes de réalisation avec diverses variantes ont été décrits ci-dessus. On notera que l'homme de l'art pourra combiner divers éléments de ces divers modes de réalisation et variantes sans faire preuve d'activité inventive.  Various embodiments with various variants have been described above. It will be appreciated that those skilled in the art may combine various elements of these various embodiments and variants without demonstrating inventive step.

Claims

REVENDICATIONS
1. Dispositif adapté à être inséré dans un foyer d'une cheminée, comprenant : 1. Device adapted to be inserted into a fireplace hearth, comprising:
une première partie approximativement horizontale jouant le rôle de chenets (32) comportant au moins deux premiers tubes disposés les uns à l'intérieur des autres (40, 42, 44), et une deuxième partie approximativement verticale com¬ portant au moins un deuxième tube (36) relié au plus externe des premiers tubes et pourvu d'au moins une ouverture (38) adaptée à déboucher en fonctionnement dans une partie haute du foyer, an approximately horizontal first portion playing the role of andirons (32) comprising at least two first tubes arranged one inside the other (40, 42, 44), and a second portion approximately vertical com ¬ carrying at least a second tube (36) connected to the outermost of the first tubes and provided with at least one opening (38) adapted to open in operation in an upper part of the hearth,
les premiers tubes (40, 42, 44) et le deuxième tube the first tubes (40, 42, 44) and the second tube
(36) étant agencés pour définir un conduit d'air serpentant entre une extrémité (34) d'un premier tube central (40) et ladite au moins une ouverture (38) par l'intermédiaire de passages (46, 48) définis aux extrémités des premiers tubes (40, 42, 44) . (36) being arranged to define an air duct snaking between one end (34) of a first central tube (40) and said at least one opening (38) through passages (46, 48) defined in ends of the first tubes (40, 42, 44).
2. Dispositif selon la revendication 1, dans lequel le deuxième tube (36) comprend plusieurs ouvertures (38) latérales.  2. Device according to claim 1, wherein the second tube (36) comprises a plurality of openings (38) side.
3. Dispositif selon la revendication 1 ou 2, dans lequel le conduit parcourt l'ensemble du volume des premiers et deuxième tubes (40, 42, 44, 36).  3. Device according to claim 1 or 2, wherein the duct travels the entire volume of the first and second tubes (40, 42, 44, 36).
4. Dispositif selon l'une quelconque des revendi¬ cations 1 à 3, dans lequel les premiers et deuxième tubes sont à section circulaire (40, 42, 44, 36) . 4. Device according to any one of revendi ¬ cations 1 to 3, wherein the first and second tubes are circular section (40, 42, 44, 36).
5. Dispositif selon l'une quelconque des revendi- cations 1 à 4, dans lequel les premiers et deuxième tubes (40, 5. Device according to any one of claims 1 to 4, wherein the first and second tubes (40,
42, 44, 36) sont en acier réfractaire, en acier inoxydable, en fonte, ou en un métal tel que le cuivre. 42, 44, 36) are made of refractory steel, stainless steel, cast iron, or a metal such as copper.
6. Dispositif selon l'une quelconque des revendi¬ cations 1 à 5, dans lequel les premiers tubes (40, 42, 44) définissent des étages du conduit, lesdits étages ayant une section croissante avec leur éloignement au centre des premiers tubes . 6. Device according to any one of revendi ¬ cation 1 to 5, wherein the first tubes (40, 42, 44) define stages of the conduit, said stages having an increasing section with their distance to the center of the first tubes.
7. Dispositif selon la revendication 6, dans lequel la section d'un deuxième tube (36) est inférieure à la section d'un étage extérieur. The device of claim 6, wherein the section of a second tube (36) is smaller than the section of an exterior stage.
8. Dispositif selon l'une quelconque des revendi- cations 1 à 7, dans lequel les axes des premiers tubes (40, 42, 8. Device according to any one of claims 1 to 7, wherein the axes of the first tubes (40, 42,
44) sont parallèles entre eux et coplanaires dans un plan passant par le deuxième tube (36), l'axe d'un premier tube d'une première section étant situé au-dessus de l'axe d'un premier tube d'une deuxième section, la première section étant supérieure à la deuxième section. 44) are parallel to each other and coplanar in a plane passing through the second tube (36), the axis of a first tube of a first section being located above the axis of a first tube of a second section, the first section being greater than the second section.
9. Dispositif selon l'une quelconque des revendi¬ cations 1 à 8, comprenant en outre un troisième tube pourvu d'au moins une ouverture supplémentaire, le troisième tube étant parallèle au deuxième tube (36), étant situé à l'extrémité des premiers tubes (40, 42, 44) opposée audit deuxième tube (36) , et s 'étendant depuis un premier tube intermédiaire pour former un deuxième conduit . 9. Device according to any one of revendi ¬ cations 1 to 8, further comprising a third tube provided with at least one additional opening, the third tube being parallel to the second tube (36), being located at the end of first tubes (40, 42, 44) opposed to said second tube (36), and extending from a first intermediate tube to form a second conduit.
10. Dispositif selon l'une quelconque des revendi¬ cations 1 à 9, comprenant trois premiers tubes (40, 42, 44) . 10. Device according to any one of revendi ¬ cations 1 to 9, comprising three first tubes (40, 42, 44).
11. Dispositif selon l'une quelconque des revendi¬ cations 1 à 10, comportant une pluralité de deuxièmes tubes (36), dans lequel les deuxièmes tubes sont solidaires d'une plaque de fond de cheminée (80) comportant des ouvertures (38) adaptées à déboucher en fonctionnement dans une partie haute du foyer. 11. Device according to any one of revendi ¬ cations 1 to 10, comprising a plurality of second tubes (36), wherein the second tubes are integral with a bottom plate (80) having openings (38). adapted to open in operation in an upper part of the hearth.
12. Dispositif selon la revendication 11, dans lequel chaque deuxième tube (36) est constitué de l'assemblage d'une tôle pliée (82, 83) et d'une partie correspondante de la plaque de fond de cheminée (80) .  12. Device according to claim 11, wherein each second tube (36) consists of the assembly of a folded sheet (82, 83) and a corresponding portion of the bottom plate (80).
13. Assemblage d'au moins deux dispositifs selon l'une quelconque des revendications 1 à 8 définissant des conduits indépendants, lesdits dispositifs étant maintenus en position à l'aide d'une armature (30) comprenant quatre parois latérales.  13. Assembly of at least two devices according to any one of claims 1 to 8 defining independent conduits, said devices being held in position by means of a frame (30) comprising four side walls.
14. Assemblage selon la revendication 13, comprenant en outre une plaque (70) amovible susceptible d'être positionnée en surface de ladite armature (30) pour fermer le dessus de ladite armature (30) . The assembly of claim 13, further comprising a removable plate (70) capable of being positioned in surface of said frame (30) for closing the top of said frame (30).
15. Assemblage selon la revendication 13 ou 14, dans lequel une paroi de ladite armature (30) comprend des ouvertures d'évacuation (60) associées à un conduit d'évacuation (64).  15. The assembly of claim 13 or 14, wherein a wall of said frame (30) comprises discharge openings (60) associated with a discharge conduit (64).
EP13808098.1A 2012-11-23 2013-11-22 Device for improving combustion in a fireplace Active EP2923152B1 (en)

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FR1261158A FR2998649A1 (en) 2012-11-23 2012-11-23 DEVICE FOR ENHANCING COMBUSTION IN A CHIMNEY
PCT/FR2013/052833 WO2014080142A1 (en) 2012-11-23 2013-11-22 Device for improving combustion in a fireplace

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CN108444223A (en) * 2018-03-15 2018-08-24 杨支钢 A kind of betel nut fumigation producer
WO2019224145A1 (en) 2018-05-19 2019-11-28 Yvan Pesenti Method for treating fumes generated by combustion of wood and device for implementing said method
WO2022219026A1 (en) 2021-04-16 2022-10-20 Atelier Dominique Imbert Wood heating device
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FR2998649A1 (en) 2014-05-30
US20150308691A1 (en) 2015-10-29
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EP2923152B1 (en) 2017-06-21
US9841193B2 (en) 2017-12-12

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