DE2325497A1 - BOILERS, IN PARTICULAR GAS HEATED CENTRAL HEATING BOILERS - Google Patents

Description

Wuppertal, May 18, 1973 11 / w

P atent registration

Attorney File No. 5198

BEOMDU A. G. »Vaduz (Liechtenstein)

Boilers, in particular gas-fired central heating boilers

The invention relates to a boiler, in particular a gas-fired central heating boiler *

Such a boiler, which is particularly intended to be arranged in residential units, i.e. also in existing apartments * to become should meet a number of requirements.

First of all, it is important that the boiler is' supplied inexpensively can be. Furthermore, its maintenance should be easy, its weight be small and its design compact and as symmetrical as possible; this especially with regard to the diverse Installation options in residential construction where the available Space, both in terms of dimensions and shape, varies greatly. The easy and quick maintenance is In addition, it is also an important point when arranging such a boiler in private homes.

The invention now creates one. Boiler, which was previously

ORlSlNAL INSPECTED

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the ten conditions. The boiler according to the invention is marked by one or more flame tubes, each of which is connected on both sides by tubes connected in parallel for a circulating, heat transfer medium, e.g. B. water, are limited, the partitions between the flame tube and water pipes through an aluminum alloy integrally cast elements are formed, one side of which is a constituent part of the

- ■ -. '■ ·. ■. ■ -. - - · '■ ■ I flame tube and the other side of which forms a composing part of the water pipe.

In the case of a draw-in version, the boiler is therefore provided with a single central flame tube and two tubes for one heat-circulating medium.

In the boilers known so far, the boiler elements or members are made of cast iron or steel, with cores being used during casting to form the tube cavities. Apart from the fact that you are thereby limited in the shape of the various tubes, because you have to take into account that the cores used can be loosened again, it is possible. borrowed that sand solids of the core casting process remain in the water pipes and can no longer be removed later. By designing the parts of the boiler that are considered to be assembled according to the invention in such a way that one side of these parts forms a component part of a flame tube and the other side forms a component part of a water pipe, the water pipes and flame tubes can be _:

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with a minimum of casting costs largely in each point adjust the desired heat transfer. The elements produced in this way can later be welded to form Flame pipes and water pipes are connected to one another. Before welding, however, all surfaces are accessible in such a way that any post-processing, e.g. B. to achieve a the degree of roughness aimed at the desired heat exchange can be carried out. The casting process without cores is suitable particularly suitable for the production of boiler elements made of light metal, z. B. an aluminum alloy, which ensure a greater heat exchange than one made of cast iron or steel Partition between a flame pipe and a water pipe.

According to a more detailed embodiment of the invention, therefore, can each element delimiting the flame tube on the flame tube side projections may be provided, the shape and arrangement of which on the maximum heat transfer in a flame zone directly above a burner bed or in one above the flame zone Combustion gas zone are directed.

Thus, according to the invention, each flame tube wall can be in the flame zone be completely occupied with pyramid-shaped projections and in the gas zone with finger-shaped projections, which latter according to are arranged in a pattern of laterally offset horizontal rows and extend to the center of the flame tube. because these fingers touch each other in the middle of the flame tube

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and are arranged offset transversely to the gas flow direction the combustion gases are forced to form a labyrinth, with turbulence occurring, which allows good heat transfer promotes.

It turns out that in the boiler according to the invention, for. B. is possible -at a flame temperature of about 1200 C a Gas temperature in the chimney of less than 200 C too reach..

In the case of the boiler according to the invention, the fingers can in cross section Be diamond-shaped, the ratio of the diagonals being between 1: 2 and 1: 4 and preferably 1: 3. The finger can continue to stand with the long diagonal in the direction of flow and in each horizontal row with a mutual distance or a division which is approximately equal to the length of the short diagonal, the fingers being more consecutive Rows are each offset over about the pitch.

In order to ensure a good release of the cast bodies from the casting mold, the fingers can also taper slightly from the flame tube wall towards the center, for example in a ratio of 102/100, the length of the large diagonal at the narrower end being approximately ^{λ is} 1/10 of the finger length.

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According to the invention, each flame tube wall on the water tube side can be provided with a system of substantially horizontally extending walls of the same height, which are connected to it attachable boiler walls a labyrinth-shaped, over practically limit the entire flame tube wall extending water channel.

According to the invention, water pipes connected in parallel can be used according to the invention the water inlet should be at half height and the water path should be chosen so that the inflowing water first downwards and then up ^ on a Ziekzackbahn.

The boiler according to the invention is structurally extremely simple: namely consists of a small number, e.g. 1, made up of four elements; it has a small width and an umpteen row of burners is sufficient, which are extremely easily accessible for maintenance purposes are. Nevertheless, the efficiency is very high thanks to the use of a high heat transfer existing light metal and through one through the specific too The casting process followed enabled the optimal cast of the Flame tube and water tube walls with ge on high heat exchange aligned elements, the closed channels are formed by äuße re welding operations.

Due to the completely symmetrical design of the boiler the space available for him during assembly adjust.

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With a draw-in version of the boiler according to the invention Boiler dimensions of 60 χ 30 χ 22 cm can have a capacity of 30000kcal / hour can be achieved. >

To clarify the invention, reference is made to the drawing an embodiment of the boiler described.

Show it:

Fig. 1 is a side view of the boiler (partially broken away and with the upper Part shown inclined to the viewer) and - - '

FIG. 2 shows a section along the line II-II in FIG. 1, ■

According to the drawing (in particular according to FIG. 2), the boiler is essentially composed of four elements, each are set up mirror-inverted to each other in twos. These elements are outer cover plates 1 and 2, between which symmetrically positioned elements 3 and 4 are arranged.

The elements made of light metal 3: and 4, form Partition walls between a central tube 3 and two water pipes, pipes 6 and 7.

The lower half of the flame tube β forms a flame zone and Above this is a combustion gas zone 9. In the flame zone 8, the walls of the flame tube are completely pyramid-shaped Projections 10, 10 'occupied, while in the combustion

tion gas zone of each element 6, 7 finger-shaped ν projections 11, 11 * extend towards each other.

The finger-shaped projections 11, 11 'are on the relevant Flame tube walls according to a pattern transverse to the combustion gas movement arranged extending rows, the fingers in two successive rows each approximately corresponding to the The spacing in each row is offset from one another. As can be seen in particular from the perspective view (Fig. 1 above), the fingers are diamond-shaped in cross-section, with the long diagonal of the diamond vertical, i.e. in the direction of the combustion gas flow extends. The mutual distance between the fingers 11 and 11 'in each row, i.e. the division, is roughly equal to the length of the short diagonal and the fingers 11 of the top row shown are horizontally offset over this pitch with respect to the fingers 11 in FIG underlying horizontal row.

The fingers 11 and 11 'touch each other in the middle of the Flame tube.

In the water pipes 6 and 7 walls 12 extend which the Elements 3 and 4 are firmly formed. Together with the cover plates 1 and 2 enclose the walls of a labyrinth or zigzag running water channel in which the water in the is essentially jammed from bottom to top. In the embodiment shown, the water is supplied via

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Inlets 13 »approximately halfway up the boiler, so that it is first guided downwards and then follows the winding path upwards, as illustrated by the arrows ¥ in FIG. _N

The water can be supplied via a T-piece. A burner 14 extends under the boiler.

It goes without saying that in the case of boilers not heated by gas, the. Floor can be run water-cooled.

Claims; - 9 -

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Claims (9)

- 9 claims; Boilers, in particular gas-fired central heating boilers, characterized by one or more Flame tubes, each on both sides of tubes connected in parallel for a circulating * heat-transferring medium, | z. B * water, to be limited, the partitions between; Flame tube and water tubes are formed by elements cast in one piece from an aluminum alloy -j ■. i one side a composing part of the flame tube and- j the other side of which forms an integral part of the water pipe. 2. Boiler according to claim 1, characterized in that that projections are provided on each element delimiting the flame tube on the flame tube side, their shape and arrangement for maximum heat transfer in a flame zone directly above a burner bed or are directed in a combustion gas zone above the flame zone. 3. Boiler according to claim 2, characterized in that that every flame tube wall in the flame zone completely with. pyramidal projections is occupied. - 10 309849/0505 4. Boiler according to claim 2 or 3, characterized in that g e - ke η η ζ ei ch η et that each flame tube wall in the combustion gas zone is set with finger-shaped projections Ms extending towards the center of the flame tube and arranged according to a pattern laterally offset horizontal rows. _> . ■■■ "· ' 5. Boiler according to one of claims 2 to 4, characterized in that the fingers in cross section are diamond-shaped and that the ratio of the diagonals is between 1: 2 and 1: 4 and preferably 1: 3. 6 * boiler according to claim 5, characterized in that the fingers with the long diagonal stand in the direction of flow and arranged in each horizontal row with a mutual distance or a division which is approximately equal to the length of the short diagonal, with the fingers of successive rows in each case are offset over about the pitch. 7. Boiler according to one of claims 4 to 6, characterized in that the fingers of the Flame tube wall towards the center, e.g. B. taper slightly in a ratio of 102/100, the length of the large diagonal am the narrower end is about 1/10 of the finger length. - 11 -3098A9 / 0B05 7325497 8.! Shackle according to one of the preceding claims, characterized in that each Flame tube wall on the water tube side with a system substantially horizontally extending walls of the same height is provided with the boiler walls fastened thereon delimit a labyrinth-shaped water channel that extends over practically the entire flame tube wall, 9. Boiler according to claim 8, characterized in that in the parallel connected water pipes the water inlet is halfway up and that the incoming water first descends and then is guided hocfck_ on a zigzag track. 0-9 849/0505