FR2518715A1 - HEATING BOILER - Google Patents

Abstract

THE BOILER ACCORDING TO THE INVENTION INCLUDES A ENCLOSURE 1 PRESENTING A COMBUSTION CHAMBER 3 EQUIPPED WITH A BURNER 8 AND WITH AN EXCHANGER 14 WITH MULTIPLE PIPES 10 CONTAINING THE FLUID TO BE HEATED. COMBUSTION CHAMBER 3 HAS AN OPENING FOR AIR INLET 21 AND A PASSAGE OF THE COMBUSTION GASES IN LABYRINTH. FINNED PIPES 16 ARE ARRANGED IN A FIRST PART 13, 14 OF THE LABYRINTH PASSAGE 4, WHILE SMOOTH PIPES 17 ARE PROVIDED IN A SECOND PART OF THIS PASSAGE. THE INVENTION ALLOWS THE EFFICIENCY OF THE BOILER TO BE INCREASED.

Description

1 -

Heating boiler.

  The invention relates to a heating boiler comprising an enclosure having a combustion chamber, a burner disposed in the combustion chamber, a heat exchanger disposed in the combustion chamber and comprising a plurality of smooth pipes adapted to contain a fluid to be heated, the combustion chamber having an air supply opening and the wall of the combustion chamber, opposite the burner, having a flue gas passage, a flue pipe connected to the flue gas passage and therethrough the labyrinth envelope, and heat exchanger pipes mounted in the pipe

chimney.

  A similar heating boiler is described in GB 1 167 002 and a description of the invention

  is to improve the efficiency of such a boiler.

  For this purpose, according to the invention, the heating boiler is characterized in that, if looking downstream, finned pipes are arranged in a first part of the chimney pipe.

  labyrinth and smooth pipes in a second part.

  Thanks to these features, the condensation heat can be used to an optimal extent so that

a maximum yield is obtained.

  According to one embodiment, the casing has an adjustable opening of air inlet close to the combustion gas outlet opening. The use of this adjustable air inlet opening makes it possible, even below the full load, to maintain constant the total flow of flue gas, so that the yield is at least equal to that obtained under full load. In this arrangement, for example, the air inlet opening can be adjusted automatically, by means of a servomotor and depending on the load, to a variable size.

  such that the yield remains at least equal.

  To minimize corrosion, the pipes can be provided with a coating made by anodizing treatment. An embodiment of the invention will be described hereinafter, by way of non-limiting example> with reference to the accompanying drawings in which: FIG. 1 is a longitudinal section of a heating boiler according to the invention, and Figure 2 is a section along line II-II

of Figure 1.

  These drawings show a heating boiler comprising an envelope 1 provided at the bottom with supports or feet 2 diagrammatically represented. The envelope 1 is subdivided into an oven or combustion chamber 3 and a labyrinth chimney pipe 4, a collector

water 5 being further provided.

  In the combustion chamber, several walls of which are provided with an insulating layer 6, penetrates, through an opening 7, a bream 8 (the flames generated by it are indicated by 9) inside the chamber of multiple heat exchanger tubes are arranged smooth pipes can be arranged close to the flames for transfer

maximum heat.

  Through one or more passages 11 of the wall 12 located opposite the burner 8, the combustion chamber 3 is connected to the labyrinth chimney pipe 4 In the embodiment shown, the labyrinth chimney pipe 4 is formed of three parts, namely a first part 13, a second part 14 and a third part 15 In parts 13 and 14 are mounted multiple finned heat exchanger tubes 16 and in the third part 15, multiple 3-pipes This third part is equipped with an outlet opening 18 to which is connected an outlet 19 (shown diagrammatically). If desired, a fan may be mounted in the outlet 19. As also shown in the drawings, the third part 15, through which flows the combustion gas which becomes colder (relatively), is

equipped with a condensate outlet 20.

  Furthermore, an air inlet opening 21, adjustable by means of a disc 22, is provided in this third part near the combustion gas outlet opening 18 This opening can be adjusted when the boiler is installed The adjustment depends, among other parameters, on the length of the outlet 19, its diameter, the number of elbows it has, etc. As the drawings show, the water box 5, divided into three compartments by partitions, extends exclusively to the side walls of the casing 1 The top of the heating boiler

is provided with an insulating layer 23.

  It is obvious that a large number of modifications

  are possible without departing from the scope of the invention.

  Thus, for example, the insulating material may be a fairly homogeneous and resistant material to dispense with support and may serve as a structural part, which allows the unit to be assembled by means of screws, so that it is possible to disassemble for cleaning, 4-

Claims (4)

  1. Heating boiler comprising a casing 1 having a combustion chamber, a burner arranged   in the combustion chamber 3, a heat exchanger 14   disposed in the combustion chamber and comprising multiple smooth pipes adapted to contain a fluid to be heated, the combustion chamber 3 having an air supply opening 21 and the wall of the combustion chamber, on the opposite side to the burner 8 , having a flue gas passage, a flue pipe connected to the flue gas passage and passing through the labyrinth envelope 4, and heat exchanger pipes mounted in the flue, boiler characterized in that, if looking downstream, finned pipes 16 are arranged in a first part-13 of the labyrinth chimney pipe 4 and smooth pipes 17 in a second part 15.   2. Boiler according to claim 1, characterized in that the casing has an adjustable opening of air inlet 21 near the opening of exhaust gas outlet 18.   3. Boiler according to claim 2, characterized in that the air inlet opening 21 is automatically adjustable, depending on the load, to a magnitude   such that the yield remains at least equal.   4. Boiler according to one of claims 1 to 3,   in which the pipes are provided with a protective layer, characterized in that this protective layer is   a coating made by anodizing treatment.