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

Abstract: A stove with solid fuel, working as a boiler for a heating system, comprising a shell (1) ending up at the top in a connection (11) tapered in the flue and showing, inside said shell (1) provided with a wing (3), a furnace (2) and above said furnace (2) and in free communication with the latter a first heat exchanger (5) with a sheaf of pipes with horizontal development, whereby the heat exchanger (5) is closed in front by a removable wing (6) and supported at its ends by sliding and resting guides (8), which are linked inside said shell (1) along its circumference.

Description: "A STOVE WITH SOLID FUEL, WORKING AS A BOILER FOR A HEATING SYSTEM" The present invention concerns a stove with solid fuel, working as a boiler for a heating system. 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. 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 t he thickness of the wall of the room to be heated. 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 t h e 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. 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. Stoves are also already known showing, above the furnace, a hollow space for the water circulation, crossed b y 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. The stove according to the present invention aims to solving above mentioned inconveniences, realizing a n 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 ther- mic power, and on the other side an easy maintenance and cleaning of the heating device. The stove with solid fuel working as a boiler for a heating system according to the present invention consists of a all-over metal structure, comprising a shell ending up at the top in a connection tapered in a flue and shows, inside said shell provided with a wing, a furnace and at the top of the furnace and in free communication with the same, a first heat exchanger with a sheaf of pipe wit horizontal development, closed in front by a removable panel and supported, at the end thereof, by sliging and resting guides being linked inside said shell along the circumference of the same. The present invention will be described more in detail hereinbelow relating to the enclosed drawings in which some embodiments are shown. Figure 1 shows a front view of a stove with solid fuel functioning as a boiler for a heating system, according to the present invention. Figure 2 shows an axonometric exploded view of the stove of figure 1 , comprising a first heat exchanger provided inside the same. Figure 3 shows an axonometric view of a sheaf of pipes of a second heat exchanger of the stove according to the present invention. Figure 4 shows a longitudinal section of the sheaf of pipes of figure 3. 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 acessories concerning the heating system as they are conventional. 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. Said shell 1 shown in front ad in correspodence with said furnace 2 a wing 3 for introducing firewood, coal or any other solid fuel. Said iwng 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 1 1 , preferably in the shape of a truncated pyramid, to a flue (not shown) with means 1 3 for the adjusting of the draught provided thereinbetween. Acording to 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 1 1. 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 fron with a panel 6 that can be removed from said shell 1 . 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. The headers 5e and 5u also work as supporting means for the whole sheaf of tubes on corresponding sliding a nd 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. Furthermore, and still according to 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. 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 placed 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. 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. It will be possible to always 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). 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. 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. Furthermore, and according to above specification, the inlet of combustion air into the stove according to 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. 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 h i g h 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: 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 ending up at the top in a connection tapered in a flue, characterized in that is has, inside said shell provided with a wing, a furnace and above said furnace and in free communication with the same, a first heat exchanger with a sheaf of pipes with horizontal development, closed in front with a removable panel and supported at the ends thereof by sliding and resting guides, which are linked to the shell, inside of the same and along its circumference. 2. A stove according to claim 1 , characterized in that the first heat exchanger is linked to a second heat exchanger at the outlet of the stove, and in said second het 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. 3. A stove according to claim 1 , characterized in that the wing is provided with a transparent panel. 4. 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.

Inventors: CROCETTI PAOLO, CROCETTI, PAOLO
Applicants: CROCETTI PAOLO, CROCETTI, PAOLO
Application year: 1998
Main classification: F24B1
IPC codes: F24B1, F24B9