EP1979696A2 - Heating device - Google Patents

Abstract

The invention relates to a heating device comprising at least one heat exchanger that spirals helically around a spiral axis, is traversed by a heating medium and is configured as a flat tube comprising ends of the spiral on the feed flow and return flow sides and heating medium connections, said heat exchanger defining a corresponding spiral-shaped flow opening. A cap-type sealing housing is attached in a fluid-tight manner to at least one end of the spiral and the heating medium connection is situated on the housing. At least one end of the spiral is obliquely truncated in relation to the spiral axis and the end of the sealing housing on the spiral side has a corresponding inverse oblique configuration. Preferably, the heating medium connection on the cap-type sealing housing runs in the direction of the spiral axis.

Description

 heater

The invention relates to a heater according to the preamble of patent claim 1.

A heater of the type mentioned is known from DE 38 15 647 Al. This consists of at least one spirally wound about a helical axis, by a heating medium (in this case, a refrigerant) can flow through the heat exchanger as a flat tube forward and return end coil ends and heating medium connections and which is formed a correspondingly coiled Durchströmspalt defining, wherein at least a Wendelende a cap-like terminal housing connected liquid-tight and is arranged at this the heating medium connection. FIG. 1 of DE 38 15 647 A1 shows a solution with a single and FIG. 2 a solution with a double helix twisted into one another.

Another heater is known from DE 102 11 489 C1, wherein such equipped with double or multiple helices as heat exchangers heaters are intended especially for larger power ranges. The integration of the two coiled, formed from flat tubes heat exchanger is carried out in the said heater by welding with end walls on both sides (so-called boards), are embossed in accordance with the slope of the two coiled flat tubes or the heat exchanger corresponding recesses, the open ends of there slope-fitting and obliquely cut flat tubes are connected to inlet and outlet openings in the boards (the oblique gate is production technology required because the boards are produced by deep drawing, thus no 90 ° angle is possible). These boards must also be designed as hollow boards in order to supply and return chambers with front and back for connecting to the mains.

For the sake of completeness, reference is also made to a heater according to DE 10 2004 005 048 Al.

To simplify these relatively complex constructions, in particular to avoid over the entire Heisgerätequerschnitt covering hollow boards and possibly to ensure the most uniform possible application of parallel heat exchanger or flat tubes, the invention is based on the object, and indeed with the proviso, while a total to create more favorable conditions for production.

This object is achieved with a heater of the type mentioned by the features cited in the characterizing part of claim 1.

According to the invention, it is thus provided that at least one end of the coil is cut off obliquely with respect to the helical axis and the end housing is likewise inclined in the opposite direction, preferably with the heating medium connection oriented in the helical axis direction in the cap-like closure housing.

In other words, the inflow and outflow openings are arranged at the helical ends in a direction inclined with respect to the flow direction plane to which the corresponding but opposite cut end or distribution housing are attached, ie between the helical end and the end housing is according to the invention an obliquely oriented plane (connection plane) is provided. In particular, from a production point of view, this oblique gate facilitates the connection of the terminal housing to the coil end, since all connection edges are accessible to a welding process without further spreading of the coil, which is not the case with coils in the sense of DE 102 11 489 C1 or DE 10 2004 005 048 A1 would be possible because the Durchströmspalt (hot gas Durchströmspalt) in contrast to DE 38 15 647 Al is relatively narrow.

On this basis, the termination or distributor housing in side view are preferably designed substantially as right-angled triangles whose hypotenuse forms the connection side for the coil ends and the heating medium connection is arranged on their larger catheters.

Although the solution according to the invention is in particular intended for heaters whose heat exchangers consist of at least two coiled tubing, in which it is therefore necessary to hydraulically connect the flat tube coils involved, to close them at their ends and to provide common heating medium connections. However, it has been shown that the solution according to the invention is advantageously also suitable for heaters, which, for example, due to lower power requirements with only one coiled flat tube (ie a heat exchanger) get along.

In heaters, however, in which at least two helically coiled coiled, parallel to each other and each other guided heat exchangers are provided and in which the final housing is designed as a distributor housing and liquid keitsdicht attached to the coil ends, according to the invention further preferably provided that the coil ends of the Heat exchangers are arranged in pairs flush with each other, each edge of their adjacently extending walls are liquid-tightly interconnected.

In contrast to DE 38 15 647 Al, the heater according to the invention has in particular the function of a boiler (see again DE 102 11 489 C1 and DE 10 2004 005 048 Al). Accordingly, it is preferably provided that the at least one heat exchanger surrounds a combustion chamber which, viewed in the direction of the helix, is delimited at both ends by a respective end wall, wherein a housing, which consists of a man-made part and the exhaust part. is formed end walls, enclosing the heat exchanger to form an exhaust gas space.

Apart from the fact that the cap-like closure or distribution housing with their Heizmediumsanschlüssen can be made independently of the heat exchanger coils and on the coils themselves, apart from the liquid-tight connection of their adjacent walls, no overflow openings or other special manufacturing interventions are required to meet the invention Forming the two heat exchanger coils as an essential element of the heater a dual function, namely on the one hand, the hydraulic connection of the two coils is made by the distributor housing, which also represent a convenient approach for preferably oriented in Wendelachsriehtung forward and return ports, and on the other hand, the heating medium return directly and concentrated supplied to the two coil ends or the supply side of the heating medium flow accordingly concentrated dissipated. In addition, since the previous hollow boards as in DE 10 2004 005 048 Al can be omitted, to take into account the end walls for the combustion chamber no pitch adaptive terminal deformations for the coil ends, but only simple through openings for the heating medium connections, which, as mentioned, parallel to the axis leave the combustion chamber on the heater.

The cap-like terminal or distributor housing are formed in cross-section to the flow direction of the heating medium substantially corresponding to the opening cross-section of both spiral ends, d. h., The two cap-like distributor housing take up virtually no additional space and represent so far only a Außenkonturseitige continuation of the coil ends.

Furthermore, the distributor housings are arranged starting from the lower flat tube or the lower flat tube helix with increasing hypotenuse with respect to the return feed and also the outflowing feed. In order to optimize the flow distribution with respect to the helixes also in the interior of the distributor housing, the terminal walls of the distributor housing opposite the attached helical ends can advantageously have a concave or profiled concave on the inside.

The termination or distributor housing can be designed in the form of deep-drawn parts or in such a way that the distributor housing are each formed from one of their formndform corresponding and aufzufaltendem sheet metal blank. It is particularly preferably provided that the end housing in the form of a casting, in particular a precision casting, is formed.

Other advantageous developments emerge from the dependent claims.

The heater according to the invention including its advantageous developments according to the dependent claims will be explained in more detail with reference to the drawing of exemplary embodiments.

It shows (partially schematic)

Figure 1 shows a simplified section through the actual heat exchanger of the heater;

FIG. 2 shows a corresponding section according to FIG. 1 in an embodiment according to the invention;

Figure 2A shows a sheet metal blank for the formation of distributor housings;

Figure 3 in perspective one end of the double helix;

FIG. 4 shows the end of the double helix according to FIG. 3 with attached distributor housing (not yet welded on);

FIG. 5 shows an illustration corresponding to the view according to FIG. 4 of a helical end in a contour-matched embodiment of the horseshoe housing (precision casting);

FIG. 6 shows an oblique section along line AA in FIG. 5; Figure 7 in perspective the heat exchanger of the heater in an overall view;

Figure 8 also in perspective and simplifies the entire heater without external accessories;

Figure 9 in perspective one end of a heat exchanger formed only from a coil with attached end housing; and

FIG. 10 shows an embodiment of the closure housing made of fine cast iron.

The heater of the invention consists according to embodiment still and with reference to Figures 1 to 8 from two helically coiled, flowed through by a heating medium and a correspondingly coiled Durchströmspalt S for hot gases defining heat exchangers 1, 2, which are flat tubes F parallel to each other and into each other or, as it were, screwed together.

These heat exchangers 1, 2, which thus form a double helix, have two helical ends 3, 4, respectively, on the return and the flow side. 3 ', 4' (see FIGS. 1, 2), wherein the two heat exchangers 1, 2, which are hydraulically connected to one another with respect to heating medium connections 5, enclose a cylindrical combustion chamber BR, which, viewed axially (ie in the direction of the helical axis), ends at both ends each of a Abεchlußwand 6, 7 is limited, one of which serves as a connection wall 6 for a burner B. A housing 8, which is formed from a jacket part 9 and the walls 6, 7 (indicated only schematically in FIG. 1), surrounds the two heat exchangers 1, 2 to form an exhaust gas chamber 11 provided with exhaust gas connection 10 (see FIG. 8) is indicated schematically in Figure 1.

For such a heater with two coils is now essential that the coil ends 3, 4, 3 ', 4' of the two heat exchangers 1, 2 forming flat tubes F arranged in pairs flush side by side and the edges R (see Figure 3) of their adjacent extending walls W liquid-tight with each other connected, preferably welded, are (the thick black line represents a weld).

The forward and backward side coil ends 3, 4, 3 ', 4' are for the purpose of hydraulic connection of the two flat tubes F together in each case a cap-like, open to the flat tubes F open as distributor housing end housing 12 liquid-tight, each distributor housing with one of the Heating medium connections 5 is provided.

As can be seen in particular from FIGS. 2 to 5, the cap-like distributor housings in the cross section seen in the flow direction of the heating medium are designed essentially corresponding to the opening cross-section of both spiral ends 3, 4, 3 ', 4', in order to occupy as little space as possible.

With reference also to FIGS. 4 to 6, the inflow and outflow openings 14 at the coil ends 3, 4, 3 ', 4' according to the invention are arranged in a plane E oriented obliquely with respect to the flow direction (see FIG. 2), to which the according opposite obliquely cut distributor housing attached, d. H. preferably welded.

Thus, the end casings 12 in side view essentially represent rectangular triangles whose hypotenuses H form the connection side for the coil ends 3, 4, 3 ', 4 ¹ , on whose larger cathodes K the associated heating medium connection 5 is arranged ,

In order to optimize the inflow and outflow conditions for the heating medium, the end housing 12 is preferably arranged with respect to the return flow guide and FIG. 2 from the lower flat tube F or from the heat exchanger 2 with rising hyphenhen H.

For the same reason, ie for the purpose of optimization, the coil ends 3, 4, 3 ', 4' opposite end walls 13 of the manifold housing 12 may concave or inside be profiled profiled, as illustrated in the oblique sectional view according to Figure 6 and 10 with.

Due to their simplicity, the previously described terminating housings 12 can also readily be produced as deep-drawn parts, but they can also be formed from a sheet blank corresponding to their final shape and one of which is shown in FIG. 2A for a side view of a triangular end housing 12, which form is preferred As a result, with reference to FIG. 2, an optimized distribution of the return inflow and the outflow of the heating medium to the two coiled heat exchangers 1, 2 results. However, it is also possible, as mentioned above, to manufacture or design the distributor caps from, for example, investment casting, wherein advantageously the respective heating medium connection 5 is formed in one piece with it (see FIG. 10).

The same applies to heaters whose heat exchanger consists only of a single flat tube coil 1, which is the completeness illustrated in Figure 9, wherein this representation is the embodiment according to the invention, in which the return and feed side coil ends 3, 4 of the flat tube F obliquely cut off and the attached end housing 12 opposite obliquely, forming a flat triangle in side view, are cut off. FIG. 10 shows, with the inclusion of the heating medium connection 5, a preferred embodiment of the closure housing 12 as a precision casting.

(19,883)

Besugszeichenliste

1 heat exchanger

2 heat exchangers

3 spiral end

3 'coil end

4 Wendelende

4 'spiral end

5 heating medium connection

6 end wall

7 end wall

8 housing

9 shell part

10 exhaust connection

11 exhaust gas space

12 termination housing

13 end wall

14 inflow and outflow opening

B burner

BR combustion chamber

E level

F flat tube

H hypothenus

K catheter

R edge

RL return

S flow-through gap

VL flow

W wall

Claims

(19,883) claims 1. Heater, comprising at least one schroufoenliniense coiled around a Wendelach.se coiled by a heating medium heat exchanger (1, 2), the flat tube upstream and downstream end coil ends (3, 4) and Heizme- diumsanεchlüsse (5) and the one is formed corresponding to coiled Durchströmspalt, wherein on at least one coil end (3, 4) a cap-like terminal housing (12) connected flüsεigkeitsdicht and at this the heating medium connection (5), characterized in that at least one coil end (3, 4) in relation cut obliquely on the helix axis and the end housing (12) Wendelendseitig also according to the reverse formed obliquely. 2. Heater according to claim 1, wherein at least two helical benlinienförmig coiled, parallel to each other and each other guided heat exchanger (1, 2) are provided, wherein the end housing (12) formed as a distributor housing and liquid-tight to the coil ends (3, 4, 3 ' , 4 '), characterized gekennzei chnet that the coil ends (3, 4, 3', 4 ') of the heat exchanger (1, 2) are arranged in pairs flush with each other, each edge (R) of their adjacent extending walls (W) are liquid-tightly interconnected. 3. Heater according to claim 2, characterized in that the edges (R) are materially connected to each other, preferably welded. 4. Heater according to one of claims 1 to 3, d a du c h e c henn e e c e that the heating medium connection (5) on the cap-like end housing (12) oriented in helical axis direction is aligned. 5. Heater according to one of claims 1 to 4, since you ek e nn zeic hn et that the end housing (12) in side view and thus perpendicular to the helical axis substantially as a right triangle, wherein the hypotenuse of the triangle liquid-tight with the Spiral end (3, 4) is connected. 6. A heater according to claim 5, da ch ek enn e e c hne t that the heating medium connection (5) is arranged on the larger side of the triangle. 7. A heater according to any one of claims 1 to 6, da c h e c e n e c e s that the closure housing (12) incorporating the heating medium connection (5) in the form of a casting, preferably a precision casting, is formed. 8. Heater according to one of claims 1 to 6, d a du c h e c e e c e s e s that the end housing (12) of sheet metal parts and the heating medium connection (5) is designed as a piece attached to the sheet metal parts. 9. Heater according to one of claims 1 to 6, since you rhgekennzeic hn et, that the end housing (12) in the form of a deep-drawn part is formed. 10. Heater according to one of claims 1 to 9, a c h e c e s e s in that the cap-like end housing (12) in cross-section to the flow direction of the heating medium seen cut substantially one or a multiple Wendelendeöff- opening cross section is designed accordingly. 11. A heater according to any one of claims 1 to 10, since c h e c henn e e c e. t that the spiral ends (3, 4) opposite end walls (13) in the end housing (12) are formed concave at least Heizungsdiumzusitig. 12. Heater according to one of claims 1 to 11, since you ek e nn zeic hn et that the at least one heat exchanger (1, 2) encloses a combustion chamber, seen in Wendelachsrichtung bounded at both ends of each end wall (6, 7) is, wherein a housing (8), which is formed from a Manteilteil (9) and the end walls (6, 7) surrounds the heat exchanger (1) to form an exhaust gas space (11).