DE3212349A1 - Low-temperature heating boiler - Google Patents

Abstract

The low-temperature heating boiler is intended for liquid or gaseous fuels and consists of, arranged in a water-bearing housing, a tubular insert for receiving the combustion chamber and the smoke gas flues, behind which a smoke gas collecting chamber with smoke gas offtake pipe is arranged. An offtake duct (2) is arranged in the smoke gas collecting chamber (1). The smoke gas offtake pipe (4) opens into the upper, inner end region (3) of the offtake duct (2). The lower inflow opening (5) of the duct (2) lies in the region of the heating gas flues (6) which empty at the bottom into the smoke gas collecting chamber. The external surface of the duct (2) forms with the wall of the smoke gas collecting chamber (1) an inflow duct to the inflow opening. <IMAGE>

Description

Low temperature heating boiler

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

Heating boilers of the type mentioned are well known and in use, but not readily suitable, operated as a so-called low-temperature heating boiler to be able to.

Low-temperature heating boilers are those boilers in which the Heat application by the burner in the event that heat is not required, easy switched off, i.e. the boiler can cool down to normal temperature. At the Switching on the burner again leads to this on the relatively cold surfaces, in particular but in the lower area of the flue gas collecting chamber, inevitable condensate formation, which must be avoided in any case, as the corrosive condensate the Would significantly reduce boiler life.

The lower area of the flue gas collection chamber is in this regard particularly at risk, as there is only a very delayed warming up of the walls, because the flue gases flowing out of the hot gas flues have a tendency to flow direct to be oriented towards the flue gas vent at the top, i.e. even those from the one below Flue gases flowing out of the area in the vicinity of the hot gas flues orientate themselves immediately upwards, which means that practically the entire lower gusset of the flue gas collection chamber is not exposed remains and only heats up slowly to temperatures that are no longer critical for are condensation.

The invention is accordingly based on the object; a heating boiler of the type mentioned with simple means to improve that in the lower area of the flue gas collecting chamber, which is critical for condensate, no condensate precipitate can be done.

This task is with a heating boiler of the aforementioned Type solved according to the invention by what is covered in the characterizing part of the main claim. Advantageous further developments result from the subclaims.

With this training according to the invention, which is extremely easy to implement is, it is achieved that all flue gases flowing out of all heating gas flues this have to pass through a critical area, which heats up accordingly quickly and in which no condensation can form as a result.

In addition, such a training with the advantageous Side effect connected that the heating gas flues arranged in the lower region of the insert are better be acted upon, as by the arrangement of the channel in the flue gas collection chamber with only a lower inflow possibility of resistance for those above Heating gas flues is enlarged.

It is known to have such boilers in front of the mouth of the smoke outlet nozzle a screen to improve the resistance distribution to be arranged with respect to the heating gas flues, however, such shielding panels are sufficient down only to about the middle height of the flue gas collection chamber, so that too the critical lower gusset of the flue gas collecting chamber remains unaffected, i.e. when arranging shielding panels of this type, the aspect of condensate safety is important neither recognized nor taken into account.

Completely independently of this, the task at hand can be practically solve even simpler means within the meaning of independent claim 7, which will be explained in more detail will.

The low-temperature heating boiler according to the invention is shown below explained in more detail with reference to the graphic representation of exemplary embodiments.

It shows schematically Fig. 1 a section through an embodiment the heating boiler; Fig. 2 shows a cross section through the flue gas collecting chamber of the Heating boiler according to Fig. 1; 3 shows a partial section through a heating boiler in another embodiment; FIG. 4 shows a view in the direction of arrow A according to FIG. 3; FIG. 5 shows a section through another embodiment of the heating boiler; Fig. 6 shows a partial section through a further embodiment of the heating boiler and FIG. 7 the independent embodiment according to claim 7.

As can be seen from FIGS. 1, 3, 5 and 6, the flue gas collecting chamber is 1 from the rear end of the sheet steel housing 15 leading into the water, liquid-tight used, tubular insert 13 is formed, wherein the smoke gas collecting chamber 1 is closed to the rear by an end wall 12.

The boilers according to Fig. 1,5 and 6 are boilers at 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 boiler according to Fig. 3, 4 are between the insert 13 itself formed combustion chamber (if necessary with the interposition of a laterally flow around Screen) and the flue gas collecting chamber, secondary heating surfaces, for example in the form of a Lamellas existing block arranged, which is also in the Rauchgassaamelkammer 1 limit the discharging heating gas flues 6.

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

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

This basic principle is now in the embodiments according to FIGS. 1-6 realized as follows: In the boiler of Fig. 1, 2 is the channel 2 is circular in cross section and has the inflow opening 5 at the bottom.

Together with the wall 9 of the flue gas collecting chamber 1, the channel delimits 2 with its annular side wall 7 an annular, towards the inflow opening 5 leading inflow channel lo. The resulting flue gas flows are indicated by arrows indicated.

In the event that the boiler is operated with a gas burner, the channel 2, as can be seen in FIG. 2, has a small safety outflow opening at the top 8 provided.

There is a seal between channel 2 and the end of the combustion chamber although not absolutely necessary, since the channel 2 is also delimited by an end wall 7 ′ is, but still recommendable.

In the case of FIG. 5, the channel 2 is achieved by the frennkammer 11 simply makes it a little longer and with a cutout that forms the inflow opening 5 5 provides. The sealing is then carried out as can be seen and in a suitable manner the end wall 12.

In the embodiment according to FIG. 6, the channel 2 is annular with its Side wall 7 gas-tight and firmly connected to the end wall 12 (e.g. welded) and protrudes as gf. open sleeve into the protruding end 14 of the combustion chamber 11, namely under Inclusion of a sealing pack as shown However, depending on the fit of the sleeve parts pushed into one another, not necessarily is required.

In the embodiment according to Figs. 3, 4, in which the smoke gases due to the After-heating surface design flow out practically over the entire insert cross-section, so not ring-shaped, the channel 2 is box-shaped, the channel wall 7 ', of course, must have a little distance to the outlets of the heating gas flues 6. Basically but here the entire flow guidance is the same as described and shown. The safety outflow opening 8 is arranged in the channel wall 7 ′.

If in the boilers according to Fig.l, 5, -6, the discharge nozzle 4 after should go off at the top, the local channel 2 is designed accordingly and in the sense 3 brought into connection with the trigger nozzle 4.

With the embodiment of FIG. 7, the problem discussed is with still much simpler means solved, namely simply by having the The flue gas outlet 4 is simply laid down and directly on the condensate-critical Area 16 arranges. However, there is inevitably a dead space for smoke gases results, with this solution it is imperative to have a Safety exhaust line 17 to be arranged, but compared to the trigger nozzle 4 a significantly reduced The line 17 is led directly to the chimney with a slight incline. Of course, the line 17 could also be at the very top of the flue gas collecting chamber 2 go off. If the flue pipe arranged on the flue gas outlet nozzle, as shown in dashed lines indicated, is led to the chimney, the line 17 can of course also directly in this drain pipe are introduced.

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Claims (7)

Claims: 9 low-temperature heating boilers for liquid or gaseous fuels, consisting of arranged in a water-bearing housing, tubular insert to accommodate the combustion chamber and the flue gas ducts behind which a flue gas sauna with flue gas outlet nozzle is arranged, d a d u r c h e k e n n n n e i n e t that there is an exhaust duct in the flue gas collecting chamber (1) (2) is arranged, in the upper, inner end region (3) of the smoke outlet nozzle (4) opens and its lower inflow opening (5) in the area of the bottom into the flue gas collecting chamber outflowing heating gas flues (6), the outer surface of the channel (2) with the Wall of the flue gas collecting chamber (1) an inflow channel (lo) to the inflow opening (5) forms. 2. Heating boiler according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that in the upper area of the wall (7,7)) of the channel (2) a safety outflow opening (8) is arranged. 3. Heating boiler according to claim 1 and / or 2, d a d u r c h g e k It is noted that the channel (2) runs perpendicular to the longitudinal axis of the boiler Vertical section circular is formed and the side wall (7) of the channel (2) with the wall (9) of the collecting chamber (1) the annular Zusträmkanal (lo) limited to the inflow opening (5). 4. Heating boiler according to claim 1 and / or 2, d a d u r c h g e k It is noted that the channel (2) is box-shaped. 5. Heating boiler according to claim 3, d a d u r c h g e k e n n -z e i c h n e t that the circular side wall (7) of the channel (2) as Extension of the combustion chamber wall (11) formed, in the lower area with a the inflow opening (5) forming the cutout (5 ') provided and with the end wall (12) of the insert (13) or the flue gas collecting chamber (1) is designed to be sealed. 6. Heating boiler according to claim 3, d a d u r c h g e k e n n -z e i c h n e t that the side wall (7) of the channel (2) with the end wall (12) of the Insert (13) or the flue gas collection chamber (1) connected gas-tight and connected to the End (14) of the combustion chamber wall (11) is designed to be sealed. 7. low-temperature heating boilers for liquid or gaseous fuels, consisting of in a water-bearing housing arranged, tubular Use to accommodate the combustion chamber and the flue gas ducts, behind which a flue gas collecting chamber is arranged with a flue gas outlet, d u r c h e k e n n n -z e i c h n e t that the flue gas outlet nozzle (4) in the lower area of the flue gas collecting chamber (2) and at its upper area a safety exhaust line with reduced cross-section (17) is arranged.