Abstract: A combustion head for a burner is provided with an outer sleeve, which houses, on the inside, a first feeding device to feed a gaseous fuel into an oxidizing air flow fed along the outer sleeve by means of a pneumatic ventilation device, at least one swirl device, which is configured to cause a primary flow F1 of gaseous fuel and oxidizing air flowing out of the outer sleeve to make a helical movement, and at least one feeding channel with an annular shape, which is obtained between the outer sleeve and the swirl device in order to feed a secondary flow F2 of oxidizing air around the primary flow F1; a second feeding device being mounted on the outside of the outer sleeve and being connected to a gaseous fuel source.

Abstract: A profile of piping, particularly for making a heat exchanger for a condensation boiler. The cross-section of the profile has a trapezoidal portion with two bases and two sides, and a triangular portion with a base and two sides. A first side of the trapezoidal portion coincides with the base of the triangular portion. The second side and the bases of the trapezoidal portion and the sides of the triangular portion form the inner walls of the profile. A first angle between the first base of the trapezoidal portion and the first side of the triangular portion adjacent thereto is 45°-135°, preferably 90°. A second angle between the second base of the trapezoidal portion and the second side of the triangular portion adjacent thereto is 180°-270°, preferably 225°. A coiled heat exchanger for condensation boilers providing said profile and a condensation boiler providing said heat exchanger are provided.

Abstract: A condensation exchanger for heating of water and for production of sanitary water, providing a first inner coil with plain surface, and a second outer coil, said second coil being externally spirally wound with respect to said first coil, within said coils circulating a thermal carrier fluid, said first coil exchanging heat with combustion fumes by radiation and convection, and said second coil exchanging heat with the combustion fumes by condensation, wherein said second coil has a plain surface, and in that an insulating septum is provided, said septum dividing said exchanger in a first upper or combustion zone, and a second lower zone, said insulating septum dividing said exchanger in said two areas with a ratio of: 45%?H1L?60%.

Abstract: A premix burner which comprises a combustion head comprising, in turn, a perforated covering element provided with a plurality of openings. The premix burner is characterised in that it is provided with a device for generating and delivering a minimum granted thermal power completely arranged inside the combustion head. Moreover, the device comprises a concave element, whose concavity faces the internal wall of the perforated covering element.

Abstract: A combustion head for a burner provided with a nozzle for atomizing a liquid fuel; the head has a first body adapted to receive a primary comburent flow and having a frontal wall arranged to produce a swirl in the primary comburent flow; and a second body adapted to receive a secondary comburent flow, to convey it towards a combustion chamber and to produce a swirl therein; a duct and an intermediate body which define a channel, adapted to feed a tertiary comburent flow into the combustion chamber and having a tapered end profile which converges towards the first body and the second body; and a frontal surface of the intermediate body substantially lies on the plane defined by the frontal wall of the first body.

Abstract: A premix burner which comprises a combustion head comprising, in turn, a perforated covering element provided with a plurality of openings. The premix burner is characterised in that it is provided with a device for generating and delivering a minimum granted thermal power completely arranged inside the combustion head. Moreover, the device comprises a concave element, whose concavity faces the internal wall of the perforated covering element.

Abstract: An air-gas premixing device to be inserted into a low-NOx gas burner. The device comprises a ring nut adapted to rotate about a symmetry axis passing through its geometric center. The rotation of the ring nut causes: the rotation of a shutter for closing/opening an air-passage section for a fraction of the air from a ventilation group; and the rotation of a premixing pipe provided with an eyelet for the passage of a combustible gas; so that the air and the combustible gas are mixed in said premixing pipe to obtain a decrease of NOx emissions.

Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube forming a plurality of turns along which water flows arranged inside the casing so as to form gaps between adjacent turns; a disk for guiding said fumes trough the gaps; and teeth integrally made with the tube for spacing adjacent turns apart and forming said gaps.

Abstract: A combustion head comprising: a pipe, having a central axis of symmetry, suitable for conveying a flow of comburent air in a combustion chamber, and a plurality of gas tubes spaced out along a circumference. Each gas tube has a first portion, having an axis of symmetry parallel to the axis, and a second portion, placed in series with respect to the first portion. The second portion in inclined at an angle with respect to the axis.

Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube along which water flows, and which is housed inside casing, and coils about the first axis to form a helix having a succession of turns; and deflecting means for directing the fumes between successive turns of a first helix portion in a first direction and between successive turns of a second helix portion in a second direction opposite to first direction; the tube forming the turns of the first helix portion has a first cross section and the tube forming the turns of the second helix portion has a second cross section different from the first cross section.

Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube along which water flows, and which is housed inside the casing and coils about the first axis to form a helix made of a succession of turns; and deflecting means for directing the fumes between successive turns; the tube being provided with a first and a second fins, which extend along the length of the tube, face one another, and are tangent to the tube.

Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube forming a plurality of turns along which water flows arranged inside the casing so as to form gaps between adjacent turns; a disk for guiding said fumes trough the gaps; and teeth integrally made with the tube for spacing adjacent turns apart and forming said gaps.

Abstract: A heat exchanger for a gas boiler for producing hot water is provided with a casing extending along a first axis and through which combustion fumes flow; a tube along which water flows, and which is housed inside casing, and coils about the first axis to form a helix having a succession of turns; and deflecting means for directing the fumes between successive turns of a first helix portion in a first direction and between successive turns of a second helix portion in a second direction opposite to first direction; the tube forming the turns of the first helix portion has a first cross section and the tube forming the turns of the second helix portion has a second cross section different from the first cross section.

Abstract: A method of controlling operation of a liquid-fuel combustion appliance. The method is characterized by including an “antiseize operating mode” in which an electric motor and a fuel pump, powered by the electric motor, are started periodically to prevent oxidation and/or polymerization of the liquid fuel in the fuel pump when the fuel pump is idle. More specifically, the fuel pump is a gear pump.

Abstract: A combustion head comprising: a pipe, having a central axis of symmetry, suitable for conveying a flow of comburent air in a combustion chamber, and a plurality of gas tubes spaced out along a circumference. Each gas tube has a first portion, having an axis of symmetry parallel to the axis, and a second portion, placed in series with respect to the first portion. The second portion in inclined at an angle with respect to the axis.

Abstract: A cover member for gas combustion heads. The cover member has at least one tubular base structure. And the tubular base structure is formed by knitting at least one metal wire.