DE2354773A1 - SINGLE BURNER WATER HEATER FOR GAS OR LIQUID FUELS - Google Patents

Description

Junkers 699 PLI 1-IWVo October 31 1973

JÜHEES

Single burner water heater for gaseous or liquid fuels

The invention relates to a water heater with a Burners for gaseous or liquid fuels and with an uncooled combustion chamber, on the upper edge of which is a Lamellenbldck trained heat exchanger is attached.

In water heaters of this type, a low overall height of the uncooled combustion chamber must be maintained to the To keep temperature pollution and heat loss within limits. However, the water heaters with an uncooled combustion chamber of low overall height are unstable in operation because the Secondary-side intake of the combustion air because of the low Buoyancy depends greatly on the arrangement and dimensions of other components of the device below the burner and above the lamellar block is affected and in the worst case is not sufficient for perfect combustion. aside from that is the static pressure for fluidic reasons

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under the lamellar block of the heat exchanger is greater than the ambient pressure, which is why between the walls of the combustion • chamber and the flame area of the burner in the particularly low-buoyancy Heating gases can flow back at the edge area. These backflowing exhaust gases not only cause an imperfect Combustion with CO formation, but can even be at the lower edge leak from the water heater and put people in danger. Furthermore, the uncooled combustion comb causes it an additional heat radiation on the combustion zone area of the burner due to higher wall temperatures of the combustion chamber.

In a known water heater with a cylindrical, uncooled combustion chamber, the heat exchanger is arranged concentrically in the combustion chamber and has the 'shape of a truncated cone turned upside down. The heat exchanger is formed by a downwardly conical spiral formed by the water-carrying pipe coil. The inner wall of the combustion chamber is lined with refractory Provided material that widens conically from a constriction in the area of the burner upwards along the heat exchanger. This lining is heated up by the rising exhaust gases and is used to heat it up through heat radiation to accelerate the water in the heat exchanger.

The invention is based on the problem of eliminating the shortcomings of the known uncooled combustion chambers by simple means to fix the low overall height and to ensure proper operation of the water heater.

According to the invention, this object is achieved by the features cited in the characterizing part of claim 1.

This ensures that an uncooled combustion chamber with a low overall height is more temperature-stable than. so far is and at

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the use of different types of gas can always achieve perfect dissemination without CO formation. "By the design and the arrangement of the insert is a fluidic one optimal buoyancy of the combustion gases achieved by ensures a vortex-free guidance of the exhaust gases and the Backflow effect is avoided. The constriction of the insert at the lower edge of the combustion chamber up to the vicinity of the base of the flame ensures a current lying against the inner wall of the exhaust gases, reduces the resulting high wall temperature of the combustion chamber and prevents inadmissible leakage of exhaust gases at the lower edge of the combustion chamber. No exhaust gases reach the base of the flame, which makes it hygienic Behavior of the device ■ is guaranteed. The one on the focal zone area directed heat radiation component is lower, whereby the temperature load on the combustion zone material is reduced and in this way the * lifespan is extended. The one on the Lower parts of the lamellar block directed radiation component is due to the upward tapering walls of the insert enlarged, resulting in an improvement in efficiency contributes. The funnel-like shape of the insert also has a strong noise-dampening effect, since no resonance noises occur.

According to the features of claims 2 to 5, the training and the installation of the insert easy and for mass production suitable.

When assembling the device, the one from the burner is opposite the position to be taken by the combustion chamber. Deviations affect the mode of operation and the service life of the device. An embodiment according to claim 6 to 8 enables dimensional and positional tolerances to be compensated for on the device. It there is no need for readjustment during production and also during subsequent maintenance.

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The required corrosion, heat and scaling resistance of the outer jacket and the use of the combustion chamber are achieved by the features of claims 9 to 16.

Three exemplary embodiments of the invention are shown schematically in the drawing.

Show it:

Pig. 1 with a section of the combustion chamber suspended insert;

Pig. 2 shows a section of the combustion chamber with as Burner attachment designed insert;

Fig. 5 is a section of the combustion chamber with the hinged Insert and a tolerance-compensating attachment on the burner.

On a rear wall, not shown, of the gas-heated water heater is a burner 10 and above an uncooled combustion chamber 11 of rectangular cross-section and of less Fixed height. At the upper end of the combustion chamber 11 there is arranged a V / heat exchanger 12, which consists of a lamellar block consists, through which a coil (not shown) for the water to be heated is passed, which connections for the cold water supply and for the hot water drainage. ·

In the embodiment of FIG. 1, an insert 13 is provided upwardly diverging walls are provided, which at the level of the lower edge 14 of the combustion chamber 11 into the Close to the flame foot contour of the burner 10 and narrowed

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on top of the outline of the upper edge 15 of the combustion chamber 11 is expanded. The insert 13 is made of sheet metal and With a usually rectangular cross section of the combustion chamber 11 has the shape of an upside down Truncated pyramid. The insert 13 is in the combustion chamber 11 hung from above. To fix the insert 13 in his suspended layer are at its upper edge 16 at least two slots 17 on each of the two opposite longitudinal sides provided for engaging inwardly bent tabs 18 of the shell of the combustion chamber 11 and its lower edge 19 is to be placed on the inwardly angled lower one Edge 14- of the combustion chamber 11 angled outwards. To the Centering the insert 13 is in its suspended position also the lower angled edge 19 of the insert 13 with Slits 20 are provided, in which tabs 21 of the lower edge 14 of the combustion chamber 11 engage. The form of use 13 gives the combustion gases aerodynamically optimum buoyancy and prevents exhaust gases from flowing back into the blind spot between the burner 10 and the lower edge 14 of the combustion comb Br 11.

In the second exemplary embodiment according to FIG. 2, a burner attachment 22 is provided as an insert I3 with a lower edge 23 on the burner 10 attached, which when installing the burner 10 in the water heater from below! inserted into the combustion chamber 11 will. This is how the insert is installed in the combustion chamber simplified and there is no need for any Adjustment work. '

3 shows an embodiment for avoiding adjustment work when assembling the water heater, the combustion chamber 11 of which is provided with an insert I3 of the configuration shown in FIG. A burner 10 is required for this purpose Extensive and up to the lower edge 19 of the insert 13 suspended in the combustion chamber 11 diverging attachment

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attached to the burner 10. This version offers the possibility in a trained according to FIG. 1, existing sclion Device by the subsequent attachment of a burner attachment according to Fig. 3 Adjustment work, especially in later Maintenance work is important to avoid. The essay 24 can, if necessary, be provided with cutouts for the secondary air to pass through.

The outer shell 11 and the insert 1J of the combustion chamber are made of sheet steel and provided with a corrosion, heat and scale resistant coating, which is also a good Temperature distribution provides.

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ORfGlNAL INSPECTED

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Claims (16)

Junkers 699 - 7 - claims: 1.) Water heater with a burner for gaseous or "" "" liquid fuels and an uncooled combustion chamber, at its upper edge a lamellar block Heat exchanger is attached, thereby g e "k e η η ζ ei c h η e t that in the combustion • chamber (11) an insert (13) with upwardly diverging Walls is provided, which is at the level of the lower edge (14) of the combustion chamber (11) to the vicinity of the Flame area outline of the burner (10), preferably narrowed at the base of the flame and on top of the outline of the upper one Edge (15) cLe-r combustion chamber (11) is widened. 2. Water heater according to claim 1, d a you r c h g e know I show that the insert (13) is made of sheet metal is made and depending on the cross-section of the combustion chamber (11) the shape of an upside-down pyramid or Has a truncated cone. 3. Water heater according to claim 1 or 2, ■ d a d u r c h ο marked that the insert (13) i & the combustion chamber (11) can be suspended from above. 4-, water heater according to claim 3 »& a du rc h g e k e η "η ζ eic h η e" t that for fixing the insert (13) in its suspended position on its upper edge (16) Slots (I7) for locking inwardly bent slots Tabs (18) of the shell of the combustion chamber (11) are provided, and that its lower edge (19) for placement on the inwardly angled lower edge (14) - 5 0 9820/0061 Junkers 699 . - 8 - ■ the combustion chamber (11) is angled outwards. 5. Water heater according to claim 4, characterized that the lower angled edge (19 or 14) of the insert (13) and the combustion chamber (11) are provided with slots (20) and tabs (21) which are assigned to one another and engage one another. 6. water heater, in particular according to claim 1 and 2, characterized in that a Burner attachment (22) with one to attach to the burner (10) formed lower band (23) into the combustion chamber (11) is provided protruding, which when installing the burner (10) in the water heater from below in "the combustion chamber (11) can be pushed in (Fig. 2). 7 · Water heater according to claim 6, characterized that the burner attachment (22) has the insert provided with upwardly diverging walls (13) of the heat exchanger forms. 8. Water heater according to one of claims 1 to 5> characterized in that a den Burner (10) more comprehensive and up to the lower edge (19) of the insert suspended in the combustion chamber (11) (13) & in diverging attachment (24) on the burner (10) is attached (Pig. 3). 9. Water heater according to one of the preceding claims, characterized in that the insert (13) has a coating of aluminum on the inner wall or an aluminum alloy. 509820/0061 Junkers 699 10. Water heater according to claim 9 »-.el a du r c hg e k en η ze i c h η et that the 'insert (13) from aluminum-clad steel sheet is made. · 11. Water heater according to claim 9 or 10, d a d u r c h g e k e η η ze i e h η e ty that the aluminum through an annealing process is at least partially diffused into the base metal of the insert (13). 12. Water heater according to claim 9 * cL a d u r c h g e - k e η η ζ e i c h η e t that the insert (13) aiis a carbon steel sheet and preferably the coating after the final shaping by dipping the insert (13) in an Al-Mf fusion lacquer and then Diffusion annealing is formed. 13. Water heater according to claim 9> dadurchgeke η η ζ eich η et _v that the Al coating is formed by hot-dip aluminizing and subsequent diffusion annealing of the insert (13). ' 14-. Water heater according to one of Claims 9 to 13i dad ure h g e mark ic h η e t that the Outer jacket (11) of the combustion chamber at least on: ' its inner wall a cover made of aluminum or a Al alloy with smooth surface and good thermal Has eflectivity. 15. Water heater according to claim 14, d a d u r c h g e - - k e η η ζ e i c h η e t that the outer jacket (11) of the Combustion chamber is made of Al-plated sheet steel. - 10 - 509820/0061 Junkers 699 - 10 - 16. Water heater according to claim 14, characterized in that that the outer casing (11) of the combustion chamber is made of sheet steel and the coating is formed by hot-dip aluminizing of the outer jacket. 509820/0061