Technical field Object of the present invention is a compact heat generator for domestic environments with a boiler that burns as fuel the pellet and that uses a particular inside run of the gases warm actions to heat water for the plant to heaters and contemporarily to directly introduce warm air in the environment.

State of the technique As is known in the last years gone spreading particular stoves with high- performance and little pollutants, denominate pellet stoves. The diffusion of these particular stoves is due to a series of advantages in comparison to the traditional wood stoves, particularly: to the use of an ecological fuel constituted from small woody trunks, denominated pellet, realized for compression of the sawdust or the discards of the workmanship of the wood deprive of varnishes and other polluting substances; to the use of rooms watertight boilers so that to get the perfect balancing of the necessary quantity of air to the combustion of the pellet; to the possibility to be able to dose the liking fuel and to allow a precise control of the temperatures; the lighting, the regulation of the feeding, the quantity of air and warm water are automatically managed by a microprocessor; but especially the elimination of the incombustibles proper of the solid fuels, with an irrelevant pollution from flue gases, and accordingly the elimination of the traditional chimney top, facilitating the installation and his use in the apartments joint ownership type with autonomous system of distribution, and the use in the cities historical centre.

Purposes and advantages of the invention Principal purpose of present invention is that to realize an heat generator structured as a pellet stove that introduces a body for thermal exchange within which water as thermo vector fluid circulate and prepared so that to suitably intercept the gases warm second such a preferred run to produce a tall efficiency with a good thermal output to its inside. Other purpose of the present invention in accord with that precedent is that to predispose a further circuit of thermal exchange, in this case to flow of air, prepared so that can use some residual heat produced by the warm gases on the walls around the boiler room. Other purpose of the present invention is that to realize a brazier conformed so that to be able of auto-distributes the pellet onto its surface, so that to realize an effective and complete combustion. Other purpose of the present invention is that to realize a fuel tank of the pellet to whose inside is positioned the body complete of the Archimedean screw and motor. Other purpose of the present Invention in accord with those precedents is that -to reduce and to contain .notably the dimensions of encumbrance of the whole generator of heat, making it compact and pleasant, with an important function of furnishing for the environment in which it is installed.

Description of the drawings and way of realizing the invention Further characteristics and advantages of the invention one will mostly result from the description of a form of preferred and illustrated execution to indicative title and not limitative from the drawings. The fig. 1 show an external frontal sight The fig. 2 show an external side sight The fig. 3 show an external superior sight The fig. 4 show the external back sight. The fig. 5 show an inside side sight with all the component principals The fig. 6 show a inside frontal sight in which the circuit of flow of the air is illustrated mainly. The fig. 7 show an inside side sight in which some component are underlined The fig. 8 show an inside side sight in which other components are underlined The figs. 9, 10 and 11 respectively show a side sight in section, a frontal sight in section and a sight from the tall one of the conformation of the brazier . With reference to the drawings with (1) the fuel tank is pointed out (1) with an inspection and loading hatch (2), as well as to tapered bottom (3). Inside this there is the mechanism for feeding the pellet (4), which consists of to motor (5) and cylinder (6) with an Archimedean screw (7), which fishes the pellet from the bottom of the tank (1) and transfers it to the feed pipes (8) where it silently falls and automatically reaches the brazier (10). The pellet, which comes out of the feed pipes (8), is deposited on the surface of the grid (9) of the brazier (10). The possession conferred to double inclination to surface of grid (9), in particular, said surface having been given to negative inclination in an anterior-posterior direction, and from the transversal middle towards the left and right sides, is such that it auto-distributes the pellet onto its surface, so that to avoid accumulations in the certain zones and therefore favouring the complete combustion. The combustion is baited by an lighter (11) and is regulated by a centrifugal aspirator (12) with the double function of suction the smokes of the combustion along the predisposed run and to make to come doses quantity of combustive air, withdrawn by the external environment, through the duct (13) in the room of distribution (14) below the grate. Continually the solid residues of the combustion fall from the grid in the ash room post below (15) and sideways (16) to the body of the grid. The feed pipes (8) is made up of two pipes, which are inserted coaxially inside each other for most of their length, whose free end crosses to hole made In the surface of the heat exchanger (17) and is fixed to it by the plate (18). The heat exchanger is constituted by a body with flat plate surfaces, which is provided with an inter-space of to varying height for the whole of their length, inside which water thermo-vector fluid normally circulates. The heat exchanger is constituted by two present portions on opposite sides of the boiler room, the first body portion (171) for thermal exchange extends from the level of fire, next to one side of the boiler room, along to path with vertical oblique and stretches and various inclinations, to the top of the boiler room, where there is the opening (19), whilst the second body portion (172) for thermal exchange goes back down on the other, opposite side, again with an irregular course and with various inclinations in its surface, until about the middle of the boiler room, realizing in this way a sort of tortuous channel (20) for the warm smokes that are originated from the combustion of the pellet and that crossing they surrender part of their heat to the metallic surfaces of the heat exchanger. This conformation and disposition of the heat exchanger it realizes to the meantime a greater surface of thermal exchange and a best trial fluid thermo dynamic of thermal exchange. In fact crossing the channel (20) the fumes tend accumulated to, alongside their caloric energy, which may be absorbed by the walls of the plates that are touched, in optimal way, by an ongoing effect of turbulence and pressure that is created by the geometric course; the desired sucking force of the aspirator (12) also contributes in part. On wall (22) are present protruding fins (23) that serve to slow -down -the flow of the. smokes and to. provoke turbulences so that to favor the thermal exchanges. On reaching the top of the boiler room, the fumes escape through the opening (19) and invert the direction of the flow, passing into the canalisation (21), which is made up of the wall (22) of the vain boiler and the back surface of the body for exchange (171) of the heat exchanger (17); the fumes are drawn by the aspirator (12). The flue gas to the outer evacuation area happens through the channel (24) of the aspirator (12), whilst the chamber below (25) serves as to filter for the solid particles crossing the whole of the fume circuit and are deposited there. It is notable the fact that the heat exchanger with geometric shape in section to irregular breaks and turns of multiple smokes with inversion of the flow and conditioned aspiration, object of the present invention, allows to vary the power disbursed in operation only of the quantity of burnt fuel unlike the traditional heat exchangers to turns of smoke whether to vary the potentiality made further to the water to increase the quantity of fuel is owed to also increase in proportion the useful surface of thermal exchange. The heat remaining on the plates around the combustion chamber and along the hot fume path is recovered before the smokes definitely escape through the chimney top by the action of the ventilator (26), passing cold air drawn by the air intakes (27) from the outside area and circulating it directly into the area across the grid (28) in the form of hot air. The boiler is built with steel plate to strong thickness while the room of combustion is in thermal steel inox, but can also be built with material of other type compatible with the environment in which is installed. The front hatch (29) has double-glazing with an inter-space, knows that the heat acting on the glass in contact with the furnace is dispelled through the convective channel (30) keeping the second glass cold, that is to direct contact with the environment, making the everything sure against possible scorching for direct contact. The boiler, object of the present invention, has been conceived for the operation in automatic, all the mechanisms are checked by an electronic card fitted with a microprocessor regulating the flow of fuel according to various internal feelers and sensors, and air for feeding to optimise combustion; it complete is of the circulator (31) for circulating water to the central heating plant, closed surge tank (32), flow switch (33), safety valve (34), outlet pipes (35), purge valve (36), inspection hatch (37) fuel tank, extra - kit for the secondary exchanger for making hot water for the sanitary fixtures. Always in reference to the drawings, is pointed out the false upper grid (38), the thermo-hydrometer (39) indicating the temperatures and pressure inside the boiler, the cold water feeding mouth (40), hot water delivery mouth (41), the radiator water return entrance (42), the furnace feeding cold air entrance opening (43), the exhaust fume outlet opening (44) and the ignition switch and electric socket (45). Structured as a stoves fed to pellet, whose dimensions are variable second of the potentiality of the firebox, it notices notable the fact that all the components needed for operation are concentrated inside the structure, safety and feeding, means that the overall size is contained thus making the whole heat generator extremely compact .