DE10000288C1 - Spiral heat exchanger; has spiral elements for at least two media, each with central tube and spiralled multichannel profile sealingly connected to slots in central tube and having tapered sealed end - Google Patents

Abstract

The heat exchanger (1) has spiral elements (3) for at least two media (A,B). Each spiral element is formed with a partly slotted central tube (4) with an end-facing entry chamber and an exit chamber with an end-facing exit. A multichannel profile (5) is sealingly connected to the slot in the central tube and curves around the central tube in a spiral. The multichannel profile has a wedge-shaped sealed end section at a deflector area. The width of the multichannel profile is a multiple of its height.

Description

Spiral heat exchangers are technical devices that are relatively small a high effective heat exchange between allow the same or different media.

The vast majority of the known spiral heat exchangers are liable the disadvantage of (e.g. the spiral heat exchanger of EP 0 380 419 B1), that with relatively complex procedures for complicated Ar manufacturing processes and multi-dimensionally welded or soldered Need to become.

In the scope of EP 0 529 819 B1, however, it is already known to extrude Multi-channel profiles by spiral winding to a spiral heat train exchangers. In this proposal, the connections to the curved multi-channel profiles once inside and once on the outside catch the spiral heat exchanger. This design does not allow a compact Design of a spiral heat exchanger and is therefore in use  limited width. In addition, the external connections the rotational symmetry and thus the pressure stability impaired.

Another peculiarity of the known spiral heat exchangers are their relative high pressure drops. If these are to be reduced, however, the Compactness restricted. There is also a formation of this spiral heat Exchangers as so-called safety spiral heat exchangers with only one exceptionally high effort possible.

Furthermore, it is difficult in the known cases to take several bring different material flows into a heat-exchanging contact can.

DE 199 13 459 C1 deals with a spiral heat exchanger, which in contains a spiral body in a cylindrical housing. This includes two provided in the central area semi-cylindrical hollow body and from the Hollow bodies outgoing spiral guide rods and a the spiral body in two turns spirally pulling one-piece partition. To this Spiral channels are formed in this way. The ends of the spiral channels are through in Connecting rods running in the longitudinal direction of the housing are closed. Between the radially outer turn sections of the partition The endsticks and the inner surface of the housing are crescent-shaped Internals provided. Connections are made to the end walls of the hollow body Inlet and outlet of the heat exchange fluids welded. The end guide rods are welded to the edges of the divider.

Starting from the prior art, the invention is based on the object to create a spiral heat exchanger that while avoiding the disadvantages mentioned above is simple and, in particular in the Large series production for integration in automobiles with fuel cells, can be manufactured efficiently and inexpensively.

This object is achieved according to the invention in the features of Claim 1.

The spiral heat exchanger then comprises at least two different ones Media-leading spiral elements. Each spiral element consists of one partially longitudinally slotted central tube and a spiral around the Central tube curved multi-channel profile together, the width of one Multiple times the height. In the central tube is an entry chamber for a medium and a separate outlet chamber for the medium educated. The multichannel profile is placed across the central tube in such a way that a channel line with individual channels is medium-conducting with the inlet chamber and the other channel strand with individual channels with the outlet chamber are connected. At the end of the  Multi-channel profile, a wedge-shaped end section is provided, one inner deflection area for the medium between the two channel lines encloses. Such a wedge-shaped end section secures a quasi-cylindrical outer contour of the spiral heat exchanger.

A medium in heat exchange occurs on one end of the Central tube into the inlet chamber and out of the inlet chamber in the sewer line connected to it. In the end section occurs the me dium into the duct line connected to the outlet chamber from here into the outlet chamber and leaves the outlet chamber at the the end face of the central tube.

In this way, with at least two media-carrying spiral elements, which surround each other intimately, guarantee perfect heat exchange performs, with the supply and discharge of the media only via the in the core area of the spiral heat exchanger located central tubes. Due to the Special design of each spiral element can be multiple spiral elements closely nested and depending on the application, more than two meters serve. The spiral heat exchanger is therefore extremely compact and can be comparatively small in volume with high exchange performance be. This makes it used in automobiles with fuel cells particularly advantageous.

The invention allows only the spiral elements to carry media or also the areas between two spiral elements with at least one Medium are applied. The areas between the spiral elements are then via a possibly multi-channel central Feed pipe and a multi-channel, which may also be possible central discharge nozzle connected to inlets and outlets.  

Furthermore, the invention allows the radial width of the spiral elements is designed differently, so that the throughput gen can vary.

By dividing a single media stream into a larger number of spiral elements with a reduced radial width per Media flow can also help reduce pressure drop simultaneous thermodynamic efficiency improvement.

Since the multi-channel profiles are closed on the side, the Spiral heat exchanger no complicated, especially spiral, To be welded. The connections of the multi-channel profiles the central tubes are only over longitudinal seams, in particular through Welding ensured. Due to multichannel flow short distances. This results in lower temperature tensions.

The invention also allows two or more spiral heat to connect exchangers in series. In this way, a lei adjustment during operation. So it can Entire facility z. B. when starting with a lower power and smaller exchanger areas are operated. Only after reaching the All exchanger surfaces are switched on at full load. Depending on the The current facility can then use the optimal efficiency can be operated.

If necessary, the spiral elements according to claim 2 in a zy linden-shaped housing can be embedded. The gap between the radial outer flat sides of the spiral elements and the inner wall of the housing is then expediently filled with a sealing material. Depending on Use of the spiral heat exchanger can be a high one act temperature-resistant sealing material.  

It when the features of claim 3 to An is particularly advantageous turn. Here, the spiral elements are axially one inside the other pushed. The central tubes are then on a common pitch circle. Such a design allows the spiral elements to axially to each other move so that it is possible to get a dynamic spiral heat to operate exchanger. Depending on the relative displacement of the spiral elements the heat transfer is then deteriorated or improved.

According to the features of claim 4, the front edge of the wedge shaped end portion of each spiral element on the radially outer Flat side of the with respect to the central tube in the curvature direction beard spiral element fixed, especially welded. This type can be used regardless of whether the spiral heat exchanger is integrated in a housing or not.

A simple design of the inlet chamber and the outlet chamber in each central tube is achieved with the features of claim 5. To a transverse wall is fixed in each central tube. The transverse wall separates then the entry chamber from the exit chamber.

According to claim 6, each transverse wall has a nose-like projection between two the flat sides of the multi-channel profiles of the spiral elements Spacer ribs that maintain spacing and form individual channels, in particular when setting, preferably welding, a multi-channel profile a central tube, the projection a centering welding gauge. About the free selectable height of the spacer ribs can also be spiral elements with under different volume throughput can be provided.

The existing in the wedge-shaped end sections of the multi-channel profiles Deflection areas for the media are formed according to claim 7, that the spacer ribs only extend from the central tubes to the end  stretch sections. Then there are none in the wedge-shaped end sections Spacer ribs more available.

The contact of the flat sides of two adjacent multi-channel profiles is still with wire inserts according to the features of claim 8 further improved. These wire inserts are used in the curvature of the more channel profiles inserted. They are in the range between two Spacer ribs, i.e. in the channel area, so that due to the resilient preload created between two spiral elements zones be, especially in the case of so-called safety spiral heat build-up perform their safety function.

Another possibility, between two circumferentially adjacent Beard spiral elements to create security zones, which are particularly useful in Safety spiral heat exchangers will be beneficial seen in the features of claim 9. After that are on the radial outer flat sides of the multi-channel profiles differ from the central tube ren from up to the wedge-shaped end sections, on both Ends wedge-shaped circumferential ribs tapering towards the flat sides intended. These circumferential ribs are therefore also limited in Channels extending winding direction and at the same time practice a distance function to the neighboring spiral element. If necessary, the Safety zones between two spiral elements with at least one neutral medium. The wedge-shaped end sections facilitate the creation of a cylindrical outer contour of the Spiral heat exchanger.

The security zones between two spiral elements can also be designed according to claim 10. After that are the edges radially inner flat sides of the multi-channel profiles differ from the Central tubes from up to the front edges of the wedge-shaped end sections extending Ab tapering in the region of the end portions  final ribs are provided and in the central longitudinal plane of the multi-channel profiles central ribs run from the central tubes to the end sections. However, further longitudinal ribs between the end are also conceivable ribs and the midribs. All ribs then work with the circumferential rib pen of the neighboring spiral elements together. Besides, it is when using this embodiment conceivable that two be each other neighboring spiral elements with respect to the longitudinal axis of the spiral heat tauschers are offset from each other, so that the peripheral ribs, conclusion ribs, central ribs and, if necessary, the longitudinal ribs of a spiral element between the ribs of the adjacent spiral elements on their flat sides get to the system and the spiral elements to a spiral heat exchangers are clamped together.

An insert sheet according to claim 11 prevents sliding into one another of the various ribs. In addition, one should in this embodiment Center chicane can be integrated. Because of the middle chicane is also guaranteed with regard to the safety zones between two spiral elements, that a medium introduced here first from the inside out and then flows from the outside in again. The supply and discharge of the Me diums takes place via end connectors.

According to claim 12, the multi-channel profiles can be divided from length extruded aluminum profiles. In the area of the later wedge then the still stretched multi-channel profiles are shaped end sections freed from the spacer ribs, for example, by means of appropriate cutters. Then the flat sides are brought together until their front edges lie together. These front edges are then tightly connected, especially welded. The long edges of the flat sides are also in the end sections tightly connected, preferably welded.

The multi-channel profiles with circumferential ribs, end ribs, middle ribs and if necessary, longitudinal ribs can correspond to the characteristics of the An  Proverb 13 also made of extruded aluminum pro divided to length filen be formed. In this case, first the circumferential ribs as well the center ribs are removed in the area of the wedge-shaped end sections. Except the circumferential ribs adjacent to the end sections become wedge-shaped beveled. The length of these areas corresponds approximately to the length of the end sections. The side ribs are up to the front edges guided, but tapered wedge-shaped in the area of the end sections. The freestyle tongues and bevels can be created by milling.

Within the scope of claim 14 is a high temperature resistant steel Sheet metal welded construction claimed. Here, the spacer ribs welded vertically on a sheet steel strip. This is then bent in the transverse direction to form a multi-channel profile Longitudinal edges are then welded together.

The spacer ribs have already before welding on the Sheet steel strips a length equal to the length of the wedge-shaped end is shorter. The same situation applies to the embodiment with circumferential ribs, end ribs, middle ribs and if necessary Longitudinal ribs that are configured accordingly before welding can. Laser welding can preferably be used as the welding method be set.

To bend in the steel sheet welded construction according to claim 14 to ensure the spacer ribs over the vertical axis, it is according to An Say 15 appropriately, the spacer ribs, especially on the radially inside lying longitudinal edges, preferably with wedge-shaped incisions Mistake. These then close when winding. In this way the spacer ribs do not become a spiral curvature Subjected to constraints. The radially outer longitudinal edges only need to be slit.

The invention is illustrated below with reference to the drawings Exemplary embodiments explained in more detail. Show it:

Fig. 1 in the schematic in vertical cross section a spiral heat exchanger shear;

Fig. 2 in the schematic front view of a single spiral element of the spiral heat exchanger of Fig. 1;

Fig. 3 in a schematic perspective view, partly in section, the spiral element of Figure 2 in the extended position.

Fig. 4 is a schematic perspective view, partially in section, of a central tube of the spiral member of Figures 2 and 3; Fig.

Figure 5 is a schematic perspective view, partially in section, of another embodiment of a spiral member in the extended position.

Fig. 6 is seen a vertical cross section through the view of Figure 3 along the line VI-VI in the direction of arrows VIa.

Fig seen 7 is a vertical cross section through the view of FIG 5 along the line VII-VII in the direction of arrows VIIa..;

Figure 8 is a partial cross section through two adjacent spiral elements according to the embodiment of Figures 5 and 7.

Fig. 9 is a partial cross section through two adjacent coil elements of the embodiment according to Figure 3 chen with zusätzli wire inlays.

Fig. 10 is a schematic perspective view, partially in section, of a length shown in the extended position of a scroll member according to another embodiment and

Fig. 11 is a schematic vertical partial cross-sectional view of a spiral heat exchanger according to another embodiment.

In Fig. 1, 1 denotes a spiral heat exchanger, as z. B. ge in automotive engineering in connection with fuel cells.

The spiral heat exchanger 1 comprises eight spiral elements 3 which can be seen in more detail in FIG. 2 in a cylindrical housing 2 . The spiral elements 3 are arranged offset to one another in the circumferential direction and pushed axially into one another.

Each spiral element 3 consists of a reference to FIGS. 3 and 4 explained in more detail the central tube 4 and a spirally ge around the central tube 4 curved multi-channel profile 5, which will be explained below in more detail also with reference to FIG. 3 (Fig. 2). The central tubes 4 of the spiral elements 3 are all on the same pitch circle 6 ( FIG. 1).

The transverse edges 7 of the spiral elements 3 facing away from the central tubes 4 are each fixed on the surface 8 of the radially outer flat side 21 of the spiral element 3 which is adjacent in the direction of curvature with respect to the central tube 4 by welding.

Characterized in that the end portions 9 of the spiral elements are wedge-shaped 3, 1 1, the spiral heat exchanger in the front view according to Fig. A substantially cylindrical contour. The gap 10 between the radially outer surfaces 8 of the spiral elements 3 and the inner wall 11 of the housing 2 is filled with a sealing material 12 .

As shown in FIG. 1 by dots and crosses, four central pipes 4 are acted upon by the medium A and the other four central tubes 4 with the medium B, respectively. Media A and B are at different temperature levels. The dots and crosses are also intended to illustrate the countercurrent principle.

Evidence of FIGS. 3 and 4, an inlet chamber 13 is formed for a medium A or B and an outlet chamber 14 in each central tube coaxial to 4 in order. The inlet chamber 13 and the outlet chamber 14 are separated from one another by a transverse wall 15 with a nose-like projection 16 . The inlet chamber 13 is on the end face 17 with z. B. acted on the medium A. The medium A leaves the outlet chamber 14 via the opposite end face 18 .

It can also be seen from FIGS. 3 and 4 that the central tube 4 is provided in the area of the inlet chamber 13 and the outlet chamber 14 with a longitudinal slot 19 which does not extend over the entire length of the central tube 4 .

A multi-channel profile 5 is welded transversely to the peripheral region 20 of the central tube 4 provided with the longitudinal slot 19 . Such a multi-channel profile 5 can, according to the embodiment in FIG. 6, be formed from an extruded aluminum profile divided into lengths. Its width B1 corresponds to a multiple of the height H. The two flat sides 21 , 22 of the multi-channel profile 5 are laterally connected by longitudinal walls 23 and between the longitudinal walls 23 by spacing ribs 24 . In this way, 5 individual channels 25 are formed in the multi-channel profile.

The individual channels 25 in the channel line 45 are via the longitudinal slot 19 in the central tube 4 with the inlet chamber 13 and in the channel line 46 with the exit chamber 14 in medium-conducting connection ( Fig. 3).

The nose-like projection 16 formed on the transverse wall 15 serves as a centering (welding gauge) when welding the multi-channel profile 5 to the central tube 4 by reaching into a single channel 25 .

The end section 9 of the multi-channel profile 5 facing away from the central tube 4 is wedge-shaped. For this purpose, the longitudinal sections of the spacer ribs 24 are milled away in this end section 9 . The ends of the flat sides 21 , 22 and wedge-shaped side wall regions 26 remain. Then the end of the flat side 21 is bent according to the arrow PF in FIG. 3 in the direction of the end of the other flat side 22 . Then the end edges 27 of the flat sides 21 , 22 to the transverse edge 7 and the side edges 28 are welded to the side wall regions 26 .

Thereafter, the multi-channel profile 5 is curved spirally according to FIGS. 1 and 2.

The flow through a spiral element 3 is illustrated by way of example with reference to FIG. 3 and a current filament STF of the medium A. It is assumed here that the stretched spiral element 3 of FIG. 3 is spirally curved in accordance with FIG. 2. The medium A enters the inlet chamber 13 via the end face 17 and from there passes via the longitudinal slot 19 into the channel strand 45 in the multi-channel profile 5 , which is connected to the inlet chamber 13 . The medium A flows through the channel strand 45 and passes over the deflection area UB formed in the end section 9 into the channel strand 46 , which is connected to the outlet chamber 14 . The medium A then leaves the spiral element 3 via the end face 18 of the outlet chamber 14 .

FIG. 5 shows a spiral element 3 a in a stretched position, in which the multi-channel profile 5 a has a cross section as shown in FIG. 7. This means that it is also an aluminum profile that is first extruded and then divided into lengths, which ribs 30 on the flat sides lying radially outside 21 circumferential ribs 29 as well as on the radially inner flat sides 22 have lateral ends 30 , a central rib 31 in the central longitudinal plane and possibly between the terminating ribs 30 and the central rib 31 further longitudinal ribs 32 .

A multi-channel profile 5 a extruded in this way and divided into length is processed with respect to the inner spacing ribs 24 in exactly the same way as explained with reference to FIG. 3. Further, the circumferential ribs 29, formed in the region of the end section 9 completely removed and in an adjacent region 33, whose length corresponds approximately to the length of the end portion 9 at 34 wedge-shaped. The lying in the region of the end section 9 Län gene sections 35 of the lateral end ribs 30 are designed wedge-shaped here. The central rib 31 is also removed in the region of the end section 9 . The ends 47 of the circumferential ribs 29 bordering the central tube 4 are beveled.

After the flat sides 21, 22 guided with their end edges 27 to each other, the end edges 27 are welded to the lateral edges 7 and the side edge 28 with the side wall portions 26th Subsequently, the multi-channel profile 5 a with the central tube 4 to the spiral element 3 a welded ver and then curved spirally.

Lying z. As shown in FIG. 11, two spiral elements 3 a radially side by side, they will be not a To formed guiding areas UB for the respective media, but by the Rip pen only in the end portions 9 of the multi-channel profiles 5 29, 30, 31 and optionally 32 and spiral channels in the area 36 between two multi-channel profiles 5 a. These areas 36 then act as safety zones, for example in a safety spiral heat exchanger. The areas 36 can optionally be acted upon by a, in particular neutral, medium.

Otherwise, the embodiment of FIG. 5 corresponds to that of FIG. 3, so that there is no further explanation.

The spiral elements 3 a can according to FIGS. 5 and 7 thus become arranged that the peripheral ribs 29 of a spiral member 3a with the statements ribs 30, the central rib 31, and optionally the longitudinal ribs to each other 32 of a radially adjacent spiral element 3 a in each case in the same transverse planes run. However, it is also conceivable according to FIG. 8 that the multi-channel profiles 5 a of two adjacent spiral elements 3 a are offset from one another in the axial direction of the spiral heat exchanger 1 such that the circumferential ribs 29 on the one multi-channel profile 5 a are the radially inner lying flat side 22 of the adjacent one contact multi-channel profile 5 a, while the completion of ribs 30, the central rib 31 and, optionally, the longitudinal ribs 32 of the radially outer multi-channel profile 5 a the radially outer flat side 21 of the inner multi-channel profile 5 contact a.

Instead of the rib construction according to FIGS. 5 and 7, a design can also be used which consists of a combination of the design according to FIGS. 3 and 9. It can be seen with reference to FIG. 9 that the multi-channel profiles 5, provided by the central pipes 4 through extending to the end portions 9 wire inserts 37 between two radially adjacent spiral elements 3 in the areas of the individual channels 25. When assembling the spiral elements 3 , the wire inserts 37 are consequently tensioned such that the radially inner and radially outer flat sides 22 , 21 are deformed in a wave-shaped manner, so as to bring about an intimate metallic contact (heat conduction) under prestress.

The embodiment of a spiral element 3 schematically illustrated in the extended position in FIG. 3 can also be produced according to the embodiment of FIG. 10.

The central tube 4 remains unchanged. The welded to the central tube 4 multi-channel profile 5 b of the spiral element 3 b consists of a high-temperature resistant steel sheet welded construction.

First, spacing ribs 24 a are welded upright in the longitudinal direction onto a sheet steel strip 38 . Thereafter, this steel sheet strip 38 provided with the spacing ribs 24 a is bent transversely to the multi-channel profile 5 b and its longitudinal edges 39 are then welded together.

So that this multi-channel profile 5 b can be curved helically around a central tube 4 , the radially inner longitudinal edges 40 of the spacing ribs 24 a are preferably provided with wedge-shaped incisions 41 . The outer longitudinal edges 40 can also be provided with such incisions 41 .

In the embodiment of FIG. 10, at the end of the multi-channel profile 5 b facing away from the central tube 4, which is not shown, the inner surfaces lying in the region of the wedge-shaped end section 9 , not shown here, are free of spacer ribs 24 a. This means that the spacer ribs 24 a can be fixed exactly to length before welding.

The same applies if the embodiment according to FIG. 10 is supplemented by peripheral ribs 29 , end ribs 30 , a central rib 31 and optionally longitudinal ribs 32 , as has been described with reference to FIGS. 5 and 7. These ribs 29-32 can then be fixed directly when welding the embodiment of FIG. 10. They are configured in length in advance. The welding is preferably carried out using laser beams.

Fig. 11 shows in partial vertical cross section of the embodiment of a Spiralwärmeaustauschers 1 a total of four coil elements 3 a according to the embodiment of FIGS. 5 and 7.

In addition, an insert 42 is integrated between the circumferential ribs 29 of a spiral element 3 a on the one hand and the end ribs 30 and the central rib 31 and, if appropriate, also the further longitudinal ribs 32 of the radially adjacent spiral elements 3 a. This insert plate 42 extends from the common longitudinal axis 43 of the Spiralele elements 3 a to approximately the tapered length portions 34 of the circumferential ribs 29 (see also Fig. 5).

The areas 44 between two insert sheets 42 are thus also partitioned off.

Also, as shown in FIG. 11, the spiral heat exchanger 1 a can be traversed by at least one central baffle 48 in the form of a plate, which ensures a spiral flow of a medium flowing up and down in each area 44 . The regions 44 are then connected to supply and discharge lines via front-side connecting pieces 49 which can be seen in FIG. 1.

List of reference symbols

1

Spiral heat exchanger

1

a Spiral heat exchanger

2

Housing f.

1

3rd

Spiral element v.

1

3rd

a spiral element v.

1

a

3rd

b spiral element v.

1

,

1

a

4

Central tubes v.

3rd

,

3rd

a,

3rd

b

5

Multi-channel profiles from

3rd

5

a multi-channel profile v.

3rd

a

5

b multichannel profile v.

3rd

b

6

Pitch circle v.

4

7

Transverse edges v.

3rd

,

3rd

a,

3rd

b

8th

Surfaces v.

21

9

End sections v.

3rd

,

3rd

a,

3rd

b

10th

Gap between

8th

u.

11

11

Interior wall v.

2

12th

Sealing material

13

Entry chamber v.

4

14

Outlet chamber v.

4

15

Transverse wall between

13

u.

14

16

Head start

15

17th

Front of v.

13

18th

Front of v.

14

19th

Longitudinal slot in

4

20th

Circumferential area v.

4

21

Flat side v.

5

,

5

a,

5

b

22

Flat side v.

5

,

5

a,

5

b

23

Longitudinal walls v.

5

,

5

a,

5

b

24th

Spacer ribs from

5

24th

a spacer ribs v.

5

b

25th

Single channels from

45

u.

46

26

wedge-shaped side wall areas v.

23

27

Front edges

21

,

22

28

Side edges v.

9

29

Circumferential ribs on

21

30th

Finishing ribs

22

31

Midrib on

22

32

Longitudinal ribs on

22

33

Area v.

5

a

34

wedge-shaped sections v.

29

35

Length sections .v

30th

36

Areas between

5

a

37

Wire inserts

38

Sheet steel strips

39

Longitudinal edges from

38

40

Longitudinal edges from

24th

a

41

Incisions in

40

42

Insert sheets

43

common longitudinal axis v.

3rd

,

3rd

a

44

Areas between

42

45

Sewer line

46

Sewer line

47

Ends of

29

48

Center chicane

49

Support
A medium
B medium
B1 width from

5

H height of

5

PF arrow
STF streamline
UB deflection area

Claims (15)

1. Spiral heat exchanger with at least two media-carrying spiral elements ( 3 , 3 a, 3 b), in which each spiral element ( 3 , 3 a, 3 b) through a partially longitudinally slotted central tube ( 4 ) with an end face acting inlet chamber ( 13 ) and an outlet chamber (14) with frontal outlet (18) and a slot in the region of the longitudinal (19) transversely to the central tube (4) densely translated to be facing away from nem the central tube (4), a deflecting region (UB) surrounding end portion (9 ) wedge-shaped and here tightly closed, spiral-shaped around the central tube ( 4 ) curved multi-channel profile ( 5 , 5 a, 5 b) is formed, the width (B1) of which corresponds to a multiple of the height (H). 2. Spiral heat exchanger according to claim 1, wherein the Spiralele elements ( 3 , 3 a, 3 b) are encased by a cylindrical housing ( 2 ) and the gap ( 10 ) between the radially outer flat sides ( 21 ) of the spiral elements ( 3 , 3rd a, 3 b) and the inner wall ( 11 ) of the housing ( 2 ) is filled with sealing material ( 12 ). 3. Spiral heat exchanger according to claim 1 or 2, in which the spiral elements ( 3 , 3 a, 3 b) are pushed axially into one another in the longitudinal direction of the central tubes ( 4 ) and the central tubes ( 4 ) lie on a pitch circle ( 6 ). 4. Spiral heat exchanger according to one of claims 1 to 3, in which the transverse edge ( 7 ) of the wedge-shaped end portion ( 9 ) of a spiral element ( 3 , 3 a, 3 b) on the radially outer flat side ( 21 ) of the central tube ( 4 ) in the curvature direction neigh disclosed spiral element ( 3 , 3 a, 3 b) is fixed. 5. Spiral heat exchanger according to one of claims 1 to 4, in which the inlet chambers ( 13 ) and the outlet chambers ( 14 ) of the central tubes ( 4 ) of the spiral elements ( 3 , 3 a, 3 b) by tightly inserted into the central tubes ( 4 ) Cross walls ( 15 ) are separated from each other. 6. Spiral heat exchanger according to claim 5, wherein the transverse walls ( 15 ) with a nose-like projection ( 16 ) between two the flat sides ( 21 , 22 ) of the multi-channel profiles ( 5 , 5 a, 5 b) of the Spiralele elements ( 3 , 3 a , 3 b) Hold spacing ribs ( 24 , 24 a) which keep individual channels ( 25 ) at a distance. 7. Spiral heat exchanger according to one of claims 1 to 6, in which the spacer ribs ( 24 , 24 a) from the central tubes ( 4 ) extend to the wedge-shaped end sections ( 9 ). 8. Spiral heat exchanger according to one of claims 1 to 7, in which between two radially adjacent spiral elements ( 3 ) in the areas of the individual channels ( 25 ) from the central tubes ( 4 ) to the end sections ( 9 ) extending wire inserts ( 37 ) are provided. 9. Spiral heat exchanger according to one of claims 1 to 7, in which on the radially outer flat sides ( 21 ) of the multi-channel profiles ( 5 a) extending from the central tubes ( 4 ) to the end sections ( 9 ), extending at both ends the flat sides ( 21 ) tapering circumferential ribs ( 29 ) are provided. 10. Spiral heat exchanger according to one of claims 1 to 7 or 9, in which the edge of the radially inner flat sides ( 22 ) of the multi-channel profiles ( 5 a) from the central tubes ( 4 ) to the transverse edges ( 7 ) of the end sections ( 9 ) extending, in the region of the end portions ( 9 ) wedge-shaped tapering end ribs ( 30 ) are provided, and in the central longitudinal plane of the multi-channel profiles ( 5 a) central ribs ( 31 ) from the central tubes ( 4 ) to the Endab sections ( 9 ). 11. Spiral heat exchanger according to claim 10, in which between the peripheral ribs ( 29 ) of the multi-channel profile ( 5 a) of a spiral element ( 3 a) on the one hand and the end ribs ( 30 ) and the central rib ( 31 ) of the multi-channel profile ( 5 a) of the radially adjacent spiral element elements ( 3 a), on the other hand, an insert plate ( 42 ) is integrated, which extends from the common longitudinal axis ( 43 ) of the spiral elements ( 3 a) up to approximately the tapered longitudinal sections ( 34 ) of the circumferential ribs ( 29 ). 12. Spiral heat exchanger according to one of claims 1 to 8, in which the multi-channel profiles ( 5 ) of the spiral elements ( 3 ) are formed from extruded aluminum profiles divided to length, which are freed from the spacing ribs ( 24 ) in the region of the wedge-shaped end sections ( 9 ) , The flat sides ( 21 , 22 ) of the end sections ( 9 ) being connected to one another via their end edges ( 27 ) and being sealed at the side edges ( 28 ). 13. Spiral heat exchanger according to one of claims 1 to 12, wherein the multi-channel profiles ( 5 a) of the spiral elements ( 3 a), the circumferential ribs ( 29 ), the end ribs ( 30 ) and the central ribs ( 31 ) are formed from extruded aluminum profiles divided into lengths the peripheral ribs ( 29 ) and the central ribs ( 31 ) in the region of the wedge-shaped end sections ( 9 ) are removed and the peripheral ribs ( 29 ) adjacent to these end sections ( 9 ) are tapered in a wedge shape, while the lateral end ribs ( 30 ) are in the region of the end sections ( 9 ) are tapered in a wedge shape. 14. Spiral heat exchanger according to one of claims 1 to 11, in which the multi-channel profiles ( 5 b) of the spiral elements ( 3 b) and, if appropriate, the circumferential ribs ( 29 ), the end ribs ( 30 ) and the central ribs ( 31 ) made of high-temperature-resistant sheet steel Welded constructions are formed, the spacer ribs ( 24 a) being welded upright in the longitudinal direction onto a steel sheet strip ( 38 ), which is then bent transversely to a multi-channel profile ( 5 b) and its longitudinal edges ( 39 ) are then welded together. 15. Spiral heat exchanger according to claim 14, in which the spacer ribs ( 24 a), in particular on the radially inner longitudinal edges ( 40 ), are preferably provided with wedge-shaped incisions ( 41 ).