A STOVE WITH SOLID FUEL, WORKING AS A BOILER FOR A HEATING SYSTEM

Description

[0001] The present invention concerns a stove with solid fuel, working as a boiler for a heating system.

[0002] As it is already well known, the stove is an apparatus for the conversion of energy into thermic and usually is different from other devices for heating, like boilers, war air generators and similar, because it is conceived for releasing heat through its shell.

[0003] Even if it has the same function of local heating, the stove is different from the fireside, where the furnace or mouth and the flue and the cowl are usually obtained in the thickness of the wall of the room to be heated.

[0004] The art already known fireplaces working as a boiler: Italian patents nos. 1067126 and 1060348, in the name of Giuseppe GABELLINI, relate to fireplace-boilers. Each boiler of this kind consists of an assembly of one or more metal walls, provided with a hollow space for the water circulation and with a plurality of copper coils with a spiral performance which are in communication with the wall(s) and are suspended on a water circulation grating and on a metal bottom, also provided with a hollow space. Such boiler is placed in a wall or angle fireplace. At the top of the coils a tubular boiler is provided for the production of warm water for sanitary use and similar, which also is touched by the flames produced by the solid fuel burning on the grating, inside the fireplace. Besides a small front cowl, the boiler has no other closing means.

[0005] Even if its working is rather satisfactory, above mentioned stove may not be used separately from a fireplace as moreover it is not provided with a limited furnace and with its own flue.

[0006] Document EP-A-0 072 530 discloses a stove working as a boiler for a heating system comprising a housing inside which a heat exchanger is provided above the combustion chamber for the exploitation of the heat of the smokes.

[0007] Stoves are also already known as mentioned in US-A-204 518 showing, above the furnace, a hollow space for the water circulation, crossed by vertical flues. This solution has a reduced thermic yield as well as problems deriving from the frequent obstructions of the flues due to soot and to the difficulty of cleaning them.

[0008] The stove according to the present invention aims to solving above mentioned inconveniences, realizing an apparatus for the local heating that combines the pleasure of a furnace, even where no corresponding fireplace has not been provided, to the advantages of a central heating. The present invention makes possible, on one side, the use of the heat with controlled combustion for the local heating as well as for the central heating with high thermic power, and on the other side an easy maintenance and cleaning of the heating device.

[0009] The stove with solid fuel working as a boiler for a heating system according to the present invention consists of a stove according to claim 1.

[0010] The present invention will be described more in detail hereinbelow relating to the enclosed drawings in which some embodiments are shown.

[0011] Figure 1 shows a front view of a stove with solid fuel functioning as a boiler for a heating system, according to one embodiment of the present invention.

[0012] Figure 2 shows an axonometric exploded view of the stove of figure 1, comprising a first heat exchanger provided inside the same.

[0013] Figure 3 shows an axonometric view of a sheaf of pipes of a second heat exchanger of the stove according to the embodiment of the present invention.

[0014] Figure 4 shows a longitudinal section of the sheaf of pipes of figure 3.

[0015] Relating to the drawings, figure 1 shows the stove working as a boiler for a heating system according to the present invention, without all those details and accessories concerning the heating system as they are conventional.

[0016] In the figures, 1 shows the shell of a stove with solid fuel, usually firewood; in the embodiment described, said shell has the shape of a parallelepiped, comprises a single room and comprises a furnace 2 at the bottom. The stove, preferably out of metal, is of the so-called all-over structure, which means that in use, the furnace is filled with fuel and the combustion takes place progressively in the whole mass.

[0017] Said shell 1 shown in front has in correspodence with said furnace 2 a wing 3 for introducing firewood, coal or any other solid fuel. Said wing 3, which has a transparent panel 30, preferably out of thermic glass, is mounted in a frame 10 showing slits 12 for the air inlet from the room into the furnace 2 according to the arrows in figure 2. Said shell 1 ends up at the top in a tapered connection 11, preferably in the shape of a truncated pyramid, to a flue (not shown) with means 13 for the adjusting of the draught provided thereinbetween.

[0018] According to one embodiment of the present invention, a first heat exchanger 5 is provided in a portion 4 of the internal space of the shell 1, between the furnace 2 and the portion limited by said connection 11.

[0019] The heat exchanger 5 consists of a sheaf of pipes with horizontal development (figure 2) which, in said portion 4 of said shell 1 into which it is housed, is touched by the flames and by the fumes produced in said furnace 2. Said portion 4 is closed in front with a panel 6 that can be removed from said shell 1.

[0020] The heat exchanger 5 has headers 5e and 5u, respectively for the inlet and the outlet of the circulating water, which are being connected with connections 7e and 7u of a central heating, which is not shown.

[0021] The headers 5e and 5u also work as supporting means for the whole sheaf of tubes on corresponding sliding and resting guides 8, which are linked inside said shell 1 along its circumference. The heat exchanger 5 has a stiffening frame 5i, the lower sides whereof are resting onto corresponding supporting rods 9.

[0022] Furthermore, and still according to the embodiment of the present invention, the first heat exchanger 5 is linked to a second sheaf of pipes 50 with horizontal development (figures 3 and 4), placed inside a parallelepiped box 51 (figure 2) at the bottom of said shell 1 of the stove and in contact with the same. The assembly of the second sheaf of pipes 50 and of the box 51 forms a second heat exchanger 55 for the warm water production for sanitary use. The second exchanger 55 receives warmth also due to the air convection and due to the conduction from the shell 1 of the stove.

[0023] The advantages of the stove-boiler according to the present invention, with respect to the known fireplace-boiler, are considerable. As the combustion may take place in a closed room - by closing the wing - it may take place slowlier and in a controlled manner according to the kind of fuel used, to the temperature locally required, i.e. near the stove and in the other rooms that are to be heated by the central heating to which the first heat exchanger 5 belongs. In an embodiment according to the present invention, the measure taken by two thermocouples connected to digital thermometer, respectivel upstream and downstream of a sheaf of pipes of 22 cm length of the heat exchanger 5, showed a temperature gradient of about 700°C and supplies an evaluation - even if only qualitatively - of the heat exchange that takes place in said exchanger and therefore of the power of the stove-boiler according to the present invention. The quantity of heat transmitted to the heating system is so high that the temperature in the expansion container causes the boiling of the water contained therein, thus suggesting to limit the combustion mass.

[0024] With respect to the fireplace-boiler, the presence of a completely closed space inside the stove supplies, besides economy in combustion, a complete safety against casual sprinkling of sparks onto curtains, carpets and other inflammable furniture. Furthermore, fumes and soot are not dispersed in any room of the house.

[0025] It will always be possible to maintain the heat exchange efficient, because the sheaf of pipes of the heat exchanger 5 may be cleaned easily and whenever required. Infact, after having unscrewed the connection between the links 7e and 7u and the respective headers 5e and 5u, closed for preventing the outlet of the water contained in said sheaf of pipes, the latter may slide horizontally once an angular 100 has been removed (figure 2).

[0026] Opposite to the sheaf of pipes with vertical development in the known embodimens mentioned above, the yield of the stove-boiler according to the present invention is so high because the flames themself touch the sheaf of pipes of the exchanger 5 in any pipe.

[0027] With respect to the boiler of the fireplace-boiler, the main advantage of the stove according to the present invention consists in the better yield of the second heat exchanger 55 which allows a greater carriage of warm water as it has a greater surface for the thermic exchange.

[0028] Furthermore, and according to above specification, the inlet of combustion air into the stove according to the embodiment of the present invention may sometimes not be able to feed all firewood: as it must pass close to the inside of the metal bottom onto which said firewood is placed, it may oxygenate only the passages obtained in the arrangement of the pieces.

[0029] Therefore, a possible variant according to the present invention provides the use of three supports placed below the structure of the stove, for the realization inside the same of two solid drawers resistant to high temperatures, with the purpose of favouring the collection of the ash and at the same time for adjusting the combustion so that the whole of the firewood rests onto two strong cast iron gratings embedded in correspondence with the small drawers below, thus obtaining the automatic collection of the ash and the exact adjusting of the combustion speed, operating on the opening or on the closing.

Claims

1. A stove with solid fuel working as a boiler for a heating system, of the so-called all-over metal kind, comprising a shell (1) ending up at the top in a connection tapered in a flue, having inside said shell a wing (3), a furnace (2) and above said furnace and in free communication with the same, a first heat exchanger (5) with a sheaf of pipes with horizontal development, supported at the ends thereof by guides (8) for facilitating its removal, said guides being linked to the shell, inside the same and along its circumference, whereby said first heat exchanger (5) is provided in a portion (4) of the internal space of said shell (1) and that said portion (4) is closed in front by a panel (6) and said first heat exchanger (5) is linked to a second heat exchanger (55) at the outlet of the stove, and in said second heat exchanger a sheaf of pipes with vertical development for the production of warm water is placed inside a box placed behind and in contact with the stove's shell (1), characterized in that said first heat exchanger (5) has a stiffening frame (5i), the lower sides thereof resting on supporting rods (9) for the periodical removal and cleaning of said first heat exchanger (5).

2. A stove according to claim 1, characterized in that the whole of the firewood is resting onto two solid cast iron gratings embedded in correspondence with the small drawers below, thus obtaining the automatic collection of the ash and the exact adjusting of the burning speed, operating on the opening or on the closing.

Ansprüche

1. Ofen für Festbrennstoff, der als Kessel für Heizanlagen ausgebildet ist, aus sogenanntem vollschichtigem Metall, bestehend aus einem Ofenmantel (1), der sich nach oben hin in ein Verbindungsstuck mit dem Rauchkanal verjüngt, und der im inneren eine Ofentür (3), einen Feuerraum (2) und über dem Feuerraum und in freier Verbindung damit, einen ersten rohrbündelartigen, sich horizontal ausbreitenden Warmaustauscher (5) enthalt, der an seinem ausseren Ende auf Gleitbahnen (8) aufliegt um seine Entfernung zu erleichtern, wobei besagte Gleitbahnen fest mit dem Mantel verbunden sind und zwar innerhalb desselben und entlang seines Umfanges in besagtem ersten Warmaustauscher (5) in einem Teil (4) des inneren Raumes besagten Mantels (1) vorgesehen sind und besagter Teil (4) ruckseitig durch eine Platte (6) verschlossen wird und besagter erster Warmaustauscher (5) beim Austritt aus dem Ofen mit einem zweiten Warmaustauscher (55) verbunden ist, wobei ein Rohrbündel, das sich vertikal ausdehnt zur Bildung von Warmwasser, sich im Inneren eines Gehäuses befindet, das ruckseitig in Verbindung mit dem Ofenmantel (1) angeordnet ist, gekennzeichnet dadurch, dass besagter erster Warmaustauscher (5) einen Verstärkungsrahmen (5i) aufweist, dessen untere Seiten auf Stutzstangen (9) abgestutzt sind zur regulären Entfernung und Säuberung besagten ersten Warmaustauschers (5).

2. Ofen nach Anspruch 1, dadurch gekennzeichnet, dass die zu verbrennende Holzmenge auf zwei festen Gusseisengittern aufliegt, die den sich darunter befindlichen Schubladen entsprechend angebracht sind, wodurch das automatische Auffangen der Asche und die genaue, Regulierung der Verbrennungsgeschwindigkeit durch Offenen oder Schliessen gewährleistet wird.

Revendications

1. Radiateur à combustible solide qui fonctionne comme chaudière pour installations à radiateur de chauffage, du type en métal, soi-disant à couche entière, qui comprenne un enveloppe (1) qui termine supérieurement avec un raccordement, qui présente bile contracture auprès du conduit de fumée et intérieurement une porte (3), une foyer (2) et, supérieurement au foyer et en communication libre avec dit foyer, un première échangeur de chaleur (5) à faisceau à tuyau avec développement horizontal, soutenu à sa périphérie par des guides (8) pour faciliter son déplacement, dites guides étant solidaires avec l'enveloppe intérieurement à dit enveloppe et le long de son périmètre, dans lequel le dit première échangeur de chaleur (5) est prévu en mie partie (4) de l'espace intérieur de dit enveloppe (1) et dite partie (4) est fermée antérieurement par un tourteau (6) et dit première échangeur de chaleur (5), à la sortie du radiateur, est raccordé à un deuxième échangeur de chaleur (55), dans lequel un faisceau de tuyau à développement vertical, pour la production d'eau chaude, est situé à lintt5rieur d'une boite, disposée postérieurement à contact avec l'enveloppe (1) du radiateur, caractérisé du fait qui dit première échangeur de chaleur (5) est prévu d'un châssis de durcissement (5i) dans lequel les cotes inférieures posent sur des barres de soutènement (9) pour le déplacement et le nettoyage périodique de dit première échangeur de chaleur (5).

2. Radiateur selon la revendication 1, caractérisé du fait que l'ensemble de bois à brûler est appuyé sur deux fortes grilles de fonte, encastrées en correspondance de caissettes qui si trouvent en-dessous, de façon à créer la récolte automatique des cendres et la régulation précise, agissant en ouverture et fermeture, de la vitesse de combustion.

Drawing