DE3205121C2 - Heating boiler - Google Patents

Abstract

The tubular part of the heating boiler carrying the flame and hot gas is designed as a cylindrical insert (1) which is formed from a double sheet metal layer. The two layers (2, 3) are connected to one another in partial areas in a thermally conductive manner via contact points (4). As a result, in certain operating phases of the heating boiler, which can be operated at a sliding temperature, a targeted heat transfer is achieved at the contact points to the heating medium (water) located in the housing (17).

Description

bead or provided with an inwardly directed small longitudinal wave, which then after the introduction of the inner layer is flattened or pressed into the outer layer with suitable tools, whereby a corresponding layer contact results

In any case, contact areas are achieved through unavoidable unevenness in the metal sheets, and such Areas where there is no direct contact To avoid such irregularities with regard to the contact points, however, the inner and / or the outer layer is preferred and advantageously provided with very slight raised knockouts so that selected contact areas result, which will be explained in more detail.

For large-volume applications with a large diameter, which overall do not heat up evenly let or required disproportionately large heating devices, the inventive The principle or the inventive training can be achieved by the fact that the insert forming the Layers dimensioned from the outset in such a way that they can be pushed into one another, which of course is initially a A correspondingly large play of the layers with respect to one another is required, which means, however, that no contact points are reached can. These contact points are required, specifically in a targeted arrangement of widths and distances but then simply achieved by inserting the arrow-like insert into a correspondingly large desiccation or corrugation device introduces and surrounding corrugations or corrugations in the sheet metal between two corresponding Rolling tools produce something that can easily be done with relatively thick metal sheets (e.g. 1 cm thick) for large boilers

Regardless of how the double-layer insert is now produced, a cylindrical, tubular one results Body that can "breathe" in itself, d. i.e., when the temperature is shut down Boilers only have limited heat transfer options at the specified contact points when they are renewed Heat application, but this means that the inner layer can warm up faster than the Outer layer cooled by the relatively cold heating medium. After the warm-up phase has passed, the but again the contact surfaces of the two layers completely or almost completely in total contact and are then effective for full heat transfer. This principle also applies to the boilers according to the DE-AS 22 21 801 and DE-PS 3 37 324 are based, but as explained, is achieved there in a different way.

The boiler according to the invention is illustrated below with the aid of the drawings of exemplary embodiments explained in more detail It shows schematically

F i g. 1 shows the double-layer insert in a water-bearing housing in section;

F i g. 2 shows a section through the double-layer wall of the insert in a preferred embodiment;

F i g. 3 is a perspective view of the double-layer insert in a special embodiment; and

F i g. 4 a section through the double-layer wall of the Use in a further embodiment.

In Fig. 1 is a basic construction of the boiler made clear, from which it can be seen that in the liquid-tight the front and rear walls 18, 19 of the water-bearing Housing 17 penetrating insert 1 one behind the other, the combustion chamber 7, the rear wall of the combustion chamber 10 (the heating gases can flow around the side), the secondary heating surfaces 11 and the flue gas collecting chamber f2 with a flue gas vent 13 are arranged.

However, this arrangement is not mandatory; That is, the basic construction can also consist in the fact that the combustion chamber sits as a pot in the free space between radial ribs between which the heating gas flues run. A secondary heating surface ti in the form of pipe registers, as shown, can, but does not have to be present.
As can be seen, the insert 1 consists of a sheet metal double layer with the layers 2, 3. At least in the area of the combustion chamber 7, care is now taken that the two layers 2, 3 only touch one another at certain contact points 4 in the mentioned operating state of the heating boiler, such as this in FIG. 2 is clarified. Here, the inner layer 3 is provided with slightly raised (in the order of magnitude of fractions of a millimeter up to approximately 1 mm) knockouts 9, which lead to specifically arranged contact points 4.

A similar design results according to Figure 4, however, the two layers 2, 3 together, as indicated, provided with circumferential beads 6 or corrugations are. In the event of a corresponding deformation, this inevitably occurs in the intermediate areas less contact-intensive and therefore less heat-conducting areas.

The knockouts 9 or the beads 6 are preferably arranged in this way with regard to the application of heat and designed that these are on the one hand narrower in the flow direction from front to back and on the other hand, their distance from one another increases.

However, this takes into account the operating conditions in the boiler, i.e. H. in the higher range Heat application is on the one hand the heat in the larger and closer contact points dissipated to a sufficient extent and to a lesser extent in less heavily used areas. Through this on the one hand, the inner layer is not overloaded and, on the other hand, it can be in the start-up phase heat up sufficiently quickly so that any condensate formed, if at all due to the rapid Heating takes place, can evaporate again immediately. As far as one has large-volume operations with regard to the external Do not heat layer 2 due to the lack of appropriately large heating facilities and thus for an insertion the inner layer 3 can and wants to expand, the inner layer 3 is shown in FIG. 3 with a longitudinal bead 5 or longitudinal shaft, whereby their outer diameter is reduced. After sliding the two layers 2, 3 is then pressurized in the direction of the arrows in FIG. 3 the inner layer 3 stretched and lies close to the outer layer 2.

Of course, beads 6 in the sense of FIG. Attach 4 Unless this is too great thick metal sheets are present, the contact points 4 can also be made by rolling seam welds running all around achieve what would be possible anyway for smaller inserts in which the outer layer 2 is shrunk is. In this case, knockouts 9 would be in the sense of FIG. 2 not absolutely necessary.

As shown in FIG. 1 recognizable, the entire insert is closed at the front and back with sealing caps 14, 14 ', the front cover accommodating the burner 16.

1 sheet of drawings

Claims (6)

1 2 ne asbestos situation to be arranged. This spacing arrangement claims: the reinforcement, if it is supposed to work, is apparently only practicable if the combustion chamber is veitical 1. Heating boiler, consisting of a water-standing or, in the case of a horizontal arrangement, only under use housing, with one of its front and 5 dung of the asbestos intermediate layer. This problem is with the Liquid heating according to DE-PS 3 37 324 non-regenerated cylindrical, with a reinforcement layer, since this tubular insert, the combustion chamber, has a reinforcement wall at a distance, even in front of the actual water sight, Nachschaltheizflächen and Rauchgassammelkam- but contains from the outset by Weaning or Stegausmer, characterized in that io formations as thermal bridges to the water chamber wall Use and reinforcement system are provided from a sheet metal dop, which in this respect also has a load-bearing function Pellage formed and the layers (2,3) take over in some areas. to each other via contact points (4) with each other As has been shown, have within the meaning of DE-PS connected in a thermally conductive manner and this with a heating boiler formed from the front 29 06 362 to the top clear performance limit, ie the pipe pull or the det and are arranged. Pressed-in cast inserts can be with justifiable 2. Lifting boiler according to claim 1, characterized in that expenditure up to a certain maximum indicates that the contact points (4) realize their diameter, and when this over-width becomes narrower from front to back, there is also a Disproportion are formed. 20th between the train heating surfaces (secondary heating surfaces) 3. Heating boiler according to claim 1 and / or 2, and the combustion chamber volume. These limits are there characterized in that the inner layer (2) with on the order of between about 40-60 cm des one running in the longitudinal direction, through total diameter and with regard to the power at about pressing against the outer layer deformed 25,000-40,000 kcaL Corrugation (5) or shaft held tensioned 25 The invention is accordingly based on the Heiist tion boiler according to DE-PS 29 06 362, the task to- 4. Boiler according to one of claims 1 to reason, such a boiler from-3, characterized in that the two layers (2, zubilden, taking into account the known Be-3) together with several encircling, the control mode with sliding temperatures (so-called tact points (4) forming beads (6) or corrugations 30 low-temperature boiler) also meet the requirements are provided. after preventing susceptibility to condensation, in particular 5. Boiler according to one of claims 1 to 4, especially in the areas critical to condensate is sufficient, characterized in that the inner layer (2) does this without the aid of cast parts and the and / or the outer layer (3) can therefore be produced differently in terms of its design, even for larger Leicher contact systems to the respective other layer 35 with contact points (4) forming knockouts (9) This task is with a boiler of the one provided is initially mentioned type according to the invention by the im 6. Heating boiler according to one of claims 1 to the characterizing part of the main claim Detected solved. Vor-3, characterized in that the contact points result in partial developments after the sub- (4) in the form of circumferential roll seam welds 40 approaches. seams are formed. The following is achieved by the formation according to the invention: on the one hand, the inner gas-filled Do not heat the beaten sheet metal layer excessively, as a Part of the heat via the targeted and prepared 45 given contact bridges drains on the other hand must The invention relates to a heating boiler according to which the inner layer can quickly heat up to such an extent that the preamble of the main claim. that at a low boiler water temperature, yes According to DE, heating boilers of the type mentioned are temperature-wise, especially in transitional periods PS 29 06 362 known shutdown boiler often results in a condensation This previously known heating boiler consists of an ionization of the fuel gases does not enter, but this is nem water-bearing housing with a cylindrical ensured that the inner wall of the boiler Sheet steel pipe train in which an internally ribbed, a pot water is not cooled directly, d. h, the heating phase shaped combustion chamber receiving, corresponding to the inner layer is relatively short, adapted cast body is pressed in and represents the basic principle of the invention, namely training Via heating boilers with corrosion-resistant coating 55 formation of the insert and the reinforcement wall as the walls exposed to combustion and flue gas, practically gapless sheet metal double layer can be a better solution that has proven itself in different ways, ultimately also depending on the has been well established in the market. Diameter and the total size of the insert practically Realize another well-known boiler after the DE-AS table. 21 801 consists of a radiant heating surface and a 60 In principle, the two layers are initially made of large sheet metal blanks that are spaced apart from the reinforcement ends wall, in order to bring condensate accumulation with its disadvantageous cylindrical shape and to prevent its two end ranks consequences. A direct heat conduction condenser connected by a longitudinal weld. In the case of kleitakt, the outer layer can then be heated due to the neren inserts provided in advance Distance is only reached when the reinforcement is 65 and due to the associated enlargement has expanded sufficiently. In consideration of the unavoidable inner layer postponed and manufacturing accuracies that are increased by cooling, it is even intended to be shrunk, so to speak, between the water wall and the reinforcement wall, but you can also use a longitudinal