FR2744521A1 - Boiler for low temperature heating - Google Patents

Abstract

The boiler has a combustion chamber (1) with a flue (2), in order to heat a secondary circuit water jacket (3), and has forward (5) and return (4) flow connections. The primary circuit is arranged in an annular space (6) around the perimeter of the combustion chamber, and is connected to the jacket.The annular space is much smaller than the jacket, and the wall (7) between them has two apertures (8,9). One of the apertures (9) is always open. The second aperture (8) is also always open, and in order to prevent returning cold water from flowing directly into the annular space, the return flow runs into the jacket in a region which is distant from the second aperture

Description

Heating boiler for low temperature heating. The current

  The subject of the invention is a heating boiler intended for heating at low temperature, of the type comprising a gas exhaust pipe, a boiler water jacket (secondary circuit) associated with a combustion chamber of a combustion boiler, which is equipped with supply and return pipes, and an annular water space (primary circuit) which is adapted to the circumference of the combustion chamber and which communicates with the water jacket, said annular water space being provided between the water jacket and the combustion chamber, the dimension of the annular water space being substantially smaller than that of the water jacket, the wall which delimits the annular water space with respect to the water jacket having two openings, one of which is always open, and the gas exhaust pipe being

  arranged inside the annular water space.

  Document DE C 34 12 331 describes a heating boiler providing heating at low temperature, in which an annular space is provided which achieves an insulating effect in order to guarantee that it always prevails inside the annular space of the temperatures to prevent the formation of condensate in the rib tube, that is, water temperatures above the dew point of combustion gases. In this annular water space, which is considered to be the primary circuit, the temperature is at least 500, while lower temperatures, which can reach for example 20, prevail in the secondary circuit, which is constituted by the

water shirt.

  Connections must be established between the primary circuit and the secondary circuit which, in the prior art, are formed by two openings, one of which is always open.

  and the other is regulated by a thermostatic valve.

  There is also known a way of bringing the gas exhaust pipe through the boiler itself, namely inside the primary circuit, passing through a long path, so that this gas exhaust pipe is always surrounded by a jacket of water which has a temperature of at least 50. This measure largely prevents the formation of condensate, and the heat still present in the gases.

  exhaust is mostly used.

  The object of the present invention is to improve the heating boiler device of the aforementioned type by the fact that the complex construction hitherto existing for closing the second opening can be omitted. This object of the present invention is achieved by the fact that the second opening is also always open and that the return pipe opens into the

  water jacket in an area distant from the opening.

  According to an advantageous design, the gas exhaust manifold is disposed in the upper part of the annular water space, in a housing projecting into the water jacket, the opening being arranged on the side of the opposite housing. at the mouth of the return line. In other words, it is proposed that the second opening also be open continuously, but that the return pipe opens into an area of the water jacket located at a distance from the connection between the water jacket and the annular water space, so that the returning cold water does not directly enter the annular water space but is forced to travel a relatively long distance through the water jacket before

  be able to enter the annular water space.

  According to the present invention, it is further provided that the gas exhaust pipe itself is located inside a box-like structure in the water jacket and that the connection opening between the inside the water jacket and the annular water space is now on one side of this housing, while the return line in the water jacket opens on the opposite side of the housing, so that the water returning is at least forced to go around the housing for the

gas exhaust manifold.

  An exemplary embodiment of the present invention is described below with reference to the drawings in which: Figure 1 is a longitudinal sectional view of a boiler according to the present invention, and Figure 2 is a sectional view along a plane

  perpendicular to the plane of Figure 1.

  In the figures, 1 denotes the actual combustion chamber of a heating boiler. This combustion chamber is closed by a door 12, which carries a fixing 14 for a burner not shown. The flame and the combustion gases from the burner open into the combustion chamber 1 and are then entrained towards the outside by a burnt gas exhaust pipe 2. Inside an enclosure 15 surrounding the whole of the boiler, a boiler water jacket 3 is disposed above the combustion chamber 1. The latter is surrounded by an annular water space 6 which is connected to the water jacket 3 by a

opening 8.

  The gas exhaust pipe 2 is also surrounded by a housing 10 which is connected in leaktight manner to the annular water space 6 at one end, but which forms at the other end, with the outer casing of the annular water space 6, the opening 8. The supply lines 5 and 5a open into the upper part of the water jacket 3, while the return line 4, now distant from the opening 8, that is to say the connection between the water jacket 3 and the annular water space 6, opens in the lower part, on the right in FIG. 1, near the housing 10. It is provided in the upper part of the housing 10 an opening 9 which provides a connection between the interior of the housing 10, therefore between the interior of the annular water space 6, and the interior of the jacket

of water 3.

  The cold water returning through the return line 4 can therefore no longer immediately enter the annular water space 6, but it is forced to pass around the housing to then reach the opening 8 through which it

  can enter the annular water space 6.

  This arrangement allows to omit the thermostatic valve which was considered until now as necessary.

Claims (2)

  1. Heating boiler for low temperature heating comprising a gas exhaust pipe (2), a boiler water jacket (3) (secondary circuit) associated with a combustion chamber (1) of a combustion, which is equipped with supply (5) and return (4) pipes, and an annular water space (6) (primary circuit) which is adapted to the circumference of the combustion chamber and which communicates with the water jacket (3), said annular water space being provided between the water jacket (3) and the combustion chamber (1), the dimension of the annular water space (6) being substantially smaller to that of the water jacket (3), the wall (7) which delimits the annular water space (6) relative to the water jacket (3) comprising two openings (8, 9) of which l 'one (9) is always open, and the gas exhaust pipe (2) being disposed inside the annular water space (6), characterized in that the second opening rture (8) is also always open and in that the return pipe (4) opens into the water jacket (3) in an area distant from the opening (8).   2. Heating boiler according to claim 1, wherein the gas exhaust pipe (2) is arranged in the upper part of the annular water space (6), in a housing (10) projecting in the water jacket (3), characterized in that the opening (8) is arranged on the side of the housing (10) opposite the mouth of the pipe back (4).