DE3212349C2 - Low temperature heating boiler - Google Patents

Abstract

The low-temperature heating boiler is intended for liquid or gaseous fuels and consists of a tubular insert arranged in a water-bearing housing to accommodate the combustion chamber and the flue gas ducts, behind which a flue gas collecting chamber with a flue gas outlet nozzle is arranged. An exhaust duct (2) is arranged in the flue gas collecting chamber (1). The flue gas outlet nozzle (4) opens into the upper, inner end area (3) of the flue duct (2). The lower inflow opening (5) of the channel (2) lies in the area of the heating gas flues (6) opening out into the flue gas collecting chamber at the bottom. The outer surface of the channel (2) and the wall of the flue gas collecting chamber (1) form an inflow channel to the inflow opening.

Description

50

The invention relates to a low-temperature heating boiler according to the preamble of the main claim.

Boilers of the type mentioned are well known and in use, but not readily suitable to be operated as a so-called low-temperature heating boiler, which also for a Boiler according to DE-GM 78 32 480 applies, in which there is an additional exhaust duct in the flue gas collection chamber is provided that shields the flue gas outlet from direct inflow,

Low-temperature heating boilers are those boilers in which the heat is applied by the burner in the event that heat is not required, it is simply switched off, d. H. the boiler can reach almost normal temperature cooling down. When the burner is switched on again or when the boiler is operated in the low temperature range this leads to the relatively cold surfaces, but especially in the lower area of the flue gas collection chamber, unavoidable to condensation, which must be avoided in any case, as this corrosive condensate would significantly reduce the boiler service life.

The lower area of the flue gas collection chamber is particularly endangered in this regard, since there only the walls warming up much more slowly, because those flowing out of the heating gas flues Flue gases have a tendency to orient themselves in terms of flow directly to the smoke outlet located above, d. h, even orientate the flue gases flowing out of the heating gas flues located in the lower area immediately upwards, which means that practically the entire lower gusset of the Rauchgassammeikammer is unstressed remains and only heats up slowly to temperatures that are no longer critical for condensation are.

The invention is accordingly based on the object of providing a heating boiler of the type mentioned at the beginning to improve with simple means to the effect that in the lower area of the condensate critical per se Flue gas collection chamber no condensation can occur.

This task is with a heating boiler! the entrance mentioned type according to the invention solved by what is covered in the characterizing part of the main claim. Beneficial Further developments result from the subclaims.

In the boiler according to DE-GM 78 32 480, the lower opening is approximately at the level of the longitudinal center axis, see above that the lower area of the Rauchgassammeikammer flows through only a small part of the smoke gases that are not able to cover the entire lower condensate-critical gusset area of the flue gas collecting chamber to paint, d. H. when arranging shielding panels of this type, the aspect of condensate safety is important neither recognized nor taken into account.

Due to the projection according to the invention that is conceivable is easy to implement, it is achieved that all flue gases flowing out of all heating gas flues these critical area that heats up accordingly quickly and in which as a result, no condensation can form.

In addition, such a design is associated with the advantageous side effect that the lower Heating gas flues arranged in the area of use are better acted upon, as the arrangement of the Channel in the Rauchgassammeikammer with only lower inflow possibility of the resistance for the above existing hot gas flues is enlarged.

For the sake of completeness, reference is made to a boiler according to DE-GM 69 16 984 Although the flue gas outlet is provided below, this boiler is, apart from his Completely different design in the draft and extraction area, even more critical with regard to possible condensation, because the lower gusset of the flue gas collector is shielded by a cooled projection is, which encloses a Bypaßkanaj with explosion flap.

The low-temperature heating boiler according to the invention is illustrated below with reference to the drawings Representation of exemplary embodiments explained in more detail. It shows schematically

F i g. 1 shows a section through an embodiment of the heating boiler;

F i g. 2 shows a cross section through the flue gas collecting chamber of the heating boiler according to FIG. 1;

F i g. 3 shows a partial section through a heating boiler in another embodiment;

F i g. 4 shows a view in the direction of arrow A according to FIG. 3;

F i g. 5 shows a section through another embodiment of the heating boiler and

F i g. 6 shows a part of a further embodiment of the heating boiler.

As can be seen from FIGS. 1, 3, 5 and 6, the Rauchgassammeikammer 1 formed from the rear end of the tubular insert 13, which is in the water-bearing Sheet steel housing 15 is used in a liquid-tight manner, with the flue gas collection chamber 1 to the rear is closed by an end wall 12.

The boilers according to FIGS. 1, 5 and 6 are around boilers in which the combustion chamber 11 is formed by a pot-like or sleeve-like insert. the Heating gas flues 6 are arranged in the resulting annular space and open into the flue gas collecting chamber 1.

In the case of the boiler according to FIG. 3, 4 are between the combustion chamber formed by the insert 13 itself (, if necessary under Interposition of a laterally flow-around screen) and the flue gas collecting chamber, secondary heating surfaces For example. Arranged in the form of a block consisting of lamellas, which are also in the Flue gas collection chamber 1 limit heating gas flues 6 opening out.

The critical areas due to the possible accumulation of condensate in the collecting chambers 1 are denoted by 16 throughout.

It is now essential that the duct 2 is arranged in the flue gas collecting chamber 1, in its upper, inner end region 3 of the flue gas outlet 4 opens, this channel 2 up in the area of the Outlets of the lower heating gas flues 6 is pulled down, so that all the flue gases are extreme Far below lying inflow opening 5 and thus the condensate critical area 16 must pass in order to to be able to get to the smoke outlet nozzle 4.

This basic principle is now in the embodiments according to FIG. 1 - 6 realized as follows:

In the boiler according to FIGS. 1, 2, the channel 2 is in cross section is circular and has the inlet flow opening 5 at the bottom. Together with the wall 9 of the Flue gas collection chamber 1, the channel 2 with its annular side wall 7 delimits an annular, to the inlet opening 5 leading inlet channels! 10. The resulting flue gas flows are indicated by arrows indicated.

In the event that the boiler is operated with a gas burner, channel 2 is as shown in FIG. 2 recognizable, Provided with a small safety outflow opening 8 at the top.

A seal between channel 2 and the end of the combustion chamber is not absolutely necessary, since channel 2 is also delimited by an end wall T. but still recommended.

In the case of FIG. 5, the channel 2 is formed by that the combustion chamber 11 is just a little longer makes and is provided with a cutout 5 'forming the inflow opening 5. The seal then takes place as recognizable, and in a suitable manner on the end wall 12.

In the embodiment according to FIG. 6 is; the channel 2 with its annular side wall 7 gas-tight and firmly connected to the Abschlusswa.id 12 (e.g. welded) and protrudes as if open sleeve into the protruding end 14 of the combustion chamber 11, namely below Inclusion of a packing, as shown, but depending on the fit of the nested Sleeve parts is not absolutely necessary

In the embodiment according to FIG. 3, 4, in which the flue gases flow out practically over the entire cross-section of the insert due to the design of the secondary heating surface, i.e. not in a ring shape, the channel 2 is box-shaped, the channel wall T of course having to have some distance from the outlets of the heating gas flues 6. In principle, however, the entire flow guidance is the same as described and shown. The safety outflow opening 8 is arranged in the duct wall T here.

If for the boilers according to Figs. 1,5,6 the trigger nozzle 4 should go upwards, the one there is Channel 2 designed accordingly and in the sense of FIG. 3 brought into connection with the trigger nozzle 4.

1 sheet of drawings

Claims (6)

Patent claims: 1. Low temperature heating boiler for liquid or gaseous fuels, consisting of in one Tubular insert arranged in the water-bearing housing for receiving the combustion chamber and the flue gas ducts, behind which a flue gas alarm chamber is arranged with a flue gas outlet, in which a flue is arranged, in the upper, inner end area of which the flue gas outlet nozzle opens, characterized in that that the lower inflow opening (5) of the exhaust duct (2) in the area of the bottom into the flue gas collecting chamber discharging heating gas flues (6) lies, the outer surface of the channel (2) with the Wall of the flue gas collection chamber (1) forms an inflow channel (10) to the inflow opening (5). 2. Heating boiler according to claim 1, characterized in that a safety outflow opening (8) is arranged in the upper region of the wall (7, T) of the channel (2). 3. Heating boiler according to claim 1 and / or 2, characterized in that the channel (2) in the vertical to the boiler axis running vertical section is circular and the side wall (7) of the channel (2) with the wall (*}) of the collecting chamber (1) the annular inflow channel (10) to the inflow opening (5) limited. 4. Heating boiler according to claim 1 and / or 2, characterized in that the channel (2) is box-shaped is trained. 5. Heating boiler according to claim 3, characterized in that that the circular side wall (7) of the channel (2) as an extension of the Combustion chamber wall (11) formed in the lower area provided with a cutout (5 ') forming the inflow opening (5) and with the end wall (12) of the insert (13) or the smoke gas collecting chamber (1) is designed to be sealed. 6. Heating boiler according to claim 3, characterized in that the side wall (7) of the channel (2) connected to the end wall (12) of the insert (13) or the flue gas collection chamber (1) in a gas-tight manner and is formed sealed with the end (14) of the combustion chamber wall (11).