EP3346219B1 - Heat exchanger housing - Google Patents

Description

The present invention relates to a heat exchanger housing, in particular for a fuel-operated vehicle heater for heating air, comprising a circumferential wall region which is elongated radially in the direction of a housing longitudinal axis, surrounds a housing interior radially outwardly, adjoins the circumferential wall region in a first axial end region of the peripheral wall region and the housing interior in the axial direction final bottom wall portion and a subsequent in a second axial end portion of the peripheral wall portion of the peripheral wall region combustion module carrier area.

From the DE 197 34 814 C1 is an in Fig. 7 shown fuel-powered vehicle heater 10 for heating air to be introduced into a vehicle interior known. This vehicle heater 10 comprises a heat exchanger housing 12 with a peripheral wall region 14 elongated in the direction of a housing longitudinal axis L. A housing interior 16 surrounded by the circumferential wall region 14 is axially closed in the direction of the housing longitudinal axis L by a bottom wall region 18 adjoining the peripheral wall region 14. On an inner side 20 of the circumferential wall region 14 facing the interior of the housing 16, first heat transfer ribs 22 extending further into the bottom wall region 18 are provided. At a side remote from the housing interior 16 outside 24 of the peripheral wall portion 14 are also extending into the bottom wall portion 18 continuing second heat transfer ribs 26 are provided.

A combustion chamber subassembly 30 with a combustion chamber housing 32 and a flame tube 34 is carried on a combustion subrack carrier region 28, which is likewise axially adjacent to the circumferential wall region 14. In a provided at a bottom portion of the combustion chamber housing 32 porous Evaporating medium 36 is fed via a fuel supply line 38 liquid fuel. The air required for combustion is conveyed by a combustion air blower 40, designed here as a side channel blower, in the direction of the combustion chamber housing 32. The combustion air blower 40 is also supported on the combustion rack support portion 28 of the heat exchanger housing 12. The combustion air blower 40 includes an electric motor 42 which drives both a conveying wheel 43 serving to convey the combustion air and a conveying gear 44 serving to convey the air to be heated. An outer casing 46 delimits the volume region to be flowed through by the air to be heated and has a heating air inlet opening 48 near the feed wheel 44. The air conveyed by the conveying wheel 44 flows along the outer housing 46 in the direction of the heat exchanger housing 12 and flows around the second heat transfer ribs 26 before it exits the outer housing 46 at a hot air outlet opening 50 lying near the bottom wall area 18.

The combustion air conveyed by the combustion air blower 40 into the combustion chamber housing 32 is burnt there with fuel evaporated from the porous evaporator medium 36. The combustion exhaust gases flow along the flame tube 34 and enter the inner space 16. There, the combustion exhaust gases flow back along the first heat transfer ribs 16 in the direction of an exhaust gas outlet opening 54 formed in an exhaust nozzle 52.

In this known vehicle heater, the heat exchanger housing 12 is provided with its peripheral wall portion 14, its bottom wall portion 18 and its combustion subrack support portion 28 as a single component integrally comprising these portions. This component, constructed of a complex structure of metal material, is manufactured in a casting process to provide all structural features.

A heat exchanger housing according to the preamble of claim 1 is known from DE 36 39 222 C1 known.

It is the object of the present invention to provide a heat exchanger housing, in particular for a fuel-operated vehicle heater for heating air, which can be produced with complex structure in a simple manner.

• einen in Richtung einer Gehäuselängsachse langgestreckten, einen Gehäuseinnenraum radial außen umgebenden Umfangswandungsbereich,
• einen in einem ersten axialen Endbereich des Umfangswandungsbereichs an den Umfangswandungsbereich anschließenden und den Gehäuseinnenraum in axialer Richtung abschließenden Bodenwandungsbereich, und
• einen in einem zweiten axialen Endbereich des Umfangswandungsbereichs an den Umfangswandungsbereich anschließenden Verbrennungsbaugruppenträgerbereich.

According to the invention this object is achieved by a heat exchanger housing, in particular for a fuel-operated vehicle heater for heating air, according to claim 1. This comprises

• an elongate circumferential wall area which is elongated in the direction of a housing longitudinal axis and which surrounds a housing interior radially on the outside;
• a bottom wall region adjoining the circumferential wall region in a first axial end region of the circumferential wall region and closing the housing interior in the axial direction, and
• a combustion subrack carrier region adjoining the peripheral wall region in a second axial end region of the peripheral wall region.

The heat exchanger housing according to the invention comprises at least three housing parts, wherein a first housing part substantially provides the peripheral wall area, a second housing part substantially provides the bottom wall area, and a third housing part substantially provides the combustion subrack area.

The inventively constructed heat exchanger housing is not formed with its three essential components circumferential wall area, bottom wall area and combustion module carrier area as a one-piece, integral component, but is divided into several separate housing parts. This makes it possible to provide each of these separate housing parts with the comparatively complex structure to be provided for this, without having to pay attention in the manufacturing process to structural features of the other housing parts.

In order to be able to achieve efficient transfer of heat from combustion exhaust gases flowing in the interior of the housing to a heat transfer medium, in particular air, flowing around the heat exchanger housing on its outside, first heat transfer ribs extending in the direction of the housing longitudinal axis are provided on an inner side of the circumferential wall region facing the housing interior. Furthermore, second heat transfer ribs extending in the direction of the housing longitudinal axis may be provided on an outer side of the peripheral wall region facing away from the housing interior, wherein at least a part of, preferably all first heat transfer ribs and / or at least a part of, preferably all second heat transfer ribs in the direction of the housing longitudinal axis in the Substantially constant cross-sectional geometry, in particular rib height or rib thickness, have.

For an improved heat transfer with nevertheless compact design, it can further be provided according to the invention that the circumferential wall region has a substantially constant radial dimension and / or wall thickness at least in the longitudinal extension region of the heat transfer ribs provided thereon in the direction of the housing longitudinal axis.

For connection to at least one of the other housing parts, at least in the axial end region to be connected to the third housing part, the circumferential wall region has a connection surface which is oriented radially inwards or radially outwards and runs around the longitudinal axis of the housing without interruption.

In order nevertheless to provide the greatest possible surface area for heat transfer, it is further proposed that second heat transfer ribs be provided on the outside of the circumferential wall area in the radially outward oriented connection surface in the axial extension region of the connection surface, or that in the radially outward oriented connection surface in the axial extension region of the connection surface the inside of the Umfangswandungsbereichs first heat transfer ribs are provided.

The first housing part is preferably an extrusion component. By the

Production in an extrusion process, it is possible, the first housing part, that is substantially the peripheral wall area, with the structural features to be provided thereto, that is, e.g. the heat transfer ribs on the inside or on the outside and the above-given dimensioning specifications provide. The structure as an extruded component also leads to a higher component quality, since fewer pores or voids are formed in the building material compared to a cast component, which is particularly important in view of the gas tightness required in a heat exchanger housing is essential. Furthermore, the disadvantageous in casting components due to the manufacturing process required, with respect to the flow control and the heat transfer capacity disadvantageous Entformungsschräge omitted.

In an embodiment which is advantageous on account of the particularly simple structure, it can be provided that the second housing part comprises a preferably substantially flat plate providing the bottom wall area.

Since, in the structure according to the invention, the circumferential wall area with the heat transfer ribs provided thereon can be used particularly efficiently for heat transfer, in order to further simplify the overall construction it can be provided that on one of the inside of the housing facing the housing interior and / or on an outside of the plate facing away from the housing interior no heat transfer ribs are provided.

The plate may be connected in a radially outer edge region of the interior of the housing facing the inside with a substantially oriented in the direction of the housing longitudinal axis end face of the peripheral wall region.

In an alternative embodiment providing a further enlarged surface for heat transfer, the second housing part may comprise a substantially dome-like wall providing the bottom wall area.

In order to further improve the heat transfer capacity, it is proposed that heat transfer ribs be provided on an inner side of the wall facing the housing interior, and / or heat transfer ribs be provided on an outer side of the wall facing away from the housing interior.

In order to avoid as far as possible in the transition between the first housing part and the second housing part impairment of the flow of the combustion gases or the heat transfer medium to be heated, it is proposed that provided on the inside of the wall heat transfer fins provided on the inside of the peripheral wall first heat transfer ribs in the direction continue the housing longitudinal axis, or / and that provided on the outside of the wall heat transfer ribs on the outside of the Umfangswandungsbereichs provided second heat transfer ribs continue in the direction of the housing longitudinal axis.

For the connection of the second housing part constructed with a dome-like wall to the first housing part, it is provided that in a radially outer edge region of the wall there is provided a connection surface which is oriented radially outward or radially inward, preferably substantially uninterrupted around the longitudinal axis of the housing.

Since the second housing part generally has no geometry that can be realized in an extrusion process, it is proposed that this is a punching or cutting component or a cast component.

The third housing part has for connection to the first housing part in a connecting region to be connected to the first housing part to a radially outside or radially inward oriented, uninterrupted around the housing longitudinal axis circumferential connection surface.

In the transition between the first housing part and the third housing part, flow impairments are avoided in that the third housing part has in its connection region a substantially circumferential wall axially extending peripheral wall, and that are provided on an inner side of the peripheral wall of the connecting portion heat transfer ribs, wherein on the inside of the Circumferential wall of the connecting portion provided heat transfer ribs on the inside of the Umfangswandungsbereichs provided first heat transfer ribs continue in the direction of the housing longitudinal axis.

For discharging the combustion exhaust gases flowing in the housing interior, an exhaust gas outlet opening penetrating the peripheral wall can be provided in the connection region. By providing the Abgasauslassöffnung on the third housing part, the provision of such an opening on the first housing part is avoided, which favors its manufacturability in an extrusion process.

Furthermore, the third housing part may comprise a mounting area adjoining the connecting area in a radial widening area with a circumferential wall offset at least in regions radially outward relative to the peripheral wall of the connecting area.

Since the third housing part has a structure which can generally not be produced in an extrusion process, it is further proposed that this is a cast component.

In order to realize a stable, but nevertheless gas-tight connection between the various housing parts, it is proposed that the first housing part is connected to the second housing part and / or the third housing part by beam welding, preferably electron beam welding. Also other methods of making a material bond, such as laser welding or soldering, may be used.

The invention further relates to a vehicle heater comprising a heat exchanger housing constructed according to the invention, wherein on the
Combustion board carrier area a combustion air blower and / or a combustion chamber assembly is supported.

Fig. 1

eine perspektivische Explosionsansicht eines mit drei Gehäuseteilen aufgebauten Wärmetauschergehäuses;

Fig. 2

eine Längsschnittdarstellung des Wärmetauschergehäuses der Fig. 1, geschnitten längs einer Linie II-II in Fig. 3;

Fig. 3

eine Axialansicht des Wärmetauschergehäuses der Fig.2 in Blickrichtung III in Fig. 2;

Fig. 4

eine Querschnittdarstellung des Wärmetauschergehäuses der Fig. 1, geschnitten längs einer Linie IV-IV in Fig. 2;

Fig. 5

eine der Fig. 1 entsprechende perspektivische Explosionsansicht einer alternativen Ausgestaltungsart eines Wärmetauschergehäuses mit drei Gehäuseteilen;

Fig. 6

eine der Fig. 2 entsprechende Längsschnittdarstellung des Wärmetauschergehäuses der Fig. 5;

Fig. 7

ein aus dem Stand der Technik bekanntes Fahrzeugheizgerät.

The invention will be described in detail below with reference to the accompanying figures. It shows:

Fig. 1

an exploded perspective view of a constructed with three housing parts heat exchanger housing;

Fig. 2

a longitudinal sectional view of the heat exchanger housing the Fig. 1 , cut along a line II-II in Fig. 3 ;

Fig. 3

an axial view of the heat exchanger housing the Fig.2 in the direction III in Fig. 2 ;

Fig. 4

a cross-sectional view of the heat exchanger housing the Fig. 1 , cut along a line IV-IV in Fig. 2 ;

Fig. 5

one of the Fig. 1 corresponding perspective exploded view of an alternative embodiment of a heat exchanger housing with three housing parts;

Fig. 6

one of the Fig. 2 corresponding longitudinal sectional view of the heat exchanger housing the Fig. 5 ;

Fig. 7

a known from the prior art vehicle heater.

Before below with reference to the Fig. 1 to 6 Be described various embodiments of a heat exchanger housing, it should be noted that such a heat exchanger housing can be used in a vehicle heater for heating air, such as in Fig. 7 is shown. In the following description of a heat exchanger housing constructed according to the invention, components or regions which correspond to components or regions already described above with respect to the prior art are designated by the same reference numeral.

The Fig. 1 to 4 show a first embodiment of a heat exchanger housing 12. This heat exchanger housing 12 is constructed with three housing parts 56, 58, 60. These three housing parts 56, 58, 60 are components manufactured separately from one another, which are connected to one another to construct the heat exchanger housing 12.

The first housing part 56 essentially comprises the circumferential wall region 14 elongated in the direction of the housing longitudinal axis L, which generally has a substantially cylindrical structure, ie has substantially the same radial dimensioning and the same wall thickness in all longitudinal regions with respect to the housing longitudinal axis L. Preferably, the first housing part 56 is produced in an extrusion process as an extruded component, so that in particular its extension length in the direction of the housing longitudinal axis L in a simple manner to different sizes of a heat exchanger housing 12 to be built can be adjusted.

Elongated first heat transfer ribs 22 are provided in the direction of the housing longitudinal axis L on an inner side 20 of the inner space 16, which can be traversed by combustion exhaust gases, and terminate radially outwardly. On an outer side facing away from the housing interior 16 outside 24 are also in the direction of the housing longitudinal axis L. elongated second heat transfer ribs 26 are provided. Both the first heat transfer ribs 22, and the second heat transfer ribs 26 have in the direction of the housing longitudinal axis L a substantially constant rib height H, which, especially the Fig. 4 illustrated, provided in various circumferential areas ribs 22 and 26 may have mutually different rib heights and different rib structures. Since the ribs 22, 26 in the housing longitudinal direction L each have a substantially constant cross-sectional profile, these ribs 22, 26 can be provided in a simple manner in an extrusion process.

In a first axial end region 62 of the first housing part 56 or the circumferential wall region 14, the housing interior 16 is closed off by the second housing part 58 provided with a substantially flat plate 64 in this exemplary embodiment. The second housing part 58, which is provided, for example, as a punched component made of sheet metal material, can rest in a radially outer edge region 66 of its inner side 68 facing the housing interior 16 against an annular end face 70 of the peripheral wall region 14 oriented substantially in the direction of the housing longitudinal axis L and in this region with the circumferential wall region 14 material fit, preferably by beam welding, such. B. electron beam welding, be connected.

As provided with the plate 64, the bottom wall portion 18 forming the second housing part 58 in this embodiment, no complex structural features, such as. B. provided thereon heat transfer ribs, has, it can be produced in a particularly simple and cost-effective manner. Further, the maximum overall length of the heat exchanger housing 10 is kept compact at the maximum possible axial length of the peripheral wall portion 14, so the first housing part 56.

In its second axial end region 72, the first housing part 56 is connected to the third housing part 60 forming the combustion subrack region 28. For this purpose, the third housing part 60 has a connecting region 74 with a circumferential wall 76, which is dimensioned and substantially so is designed so that it continues the peripheral wall portion 14 axially. The circumferential wall region 14 has, in this second axial end region 72, a connection surface 78 which is oriented radially outwards and which surrounds the housing longitudinal axis L without interruption. This can be provided, for example, by removing a length section of the second heat transfer ribs 26 and also the radially outer region of the circumferential wall region 14 in this longitudinal region of the first housing part 56 by material-removing machining. Provided on the circumferential wall 76 of the connecting region 74 of the third housing part 60 is a connection surface 80 that revolves circumferentially around the housing longitudinal axis L and which radially adjoins the connecting surface 78 at the second axial end region 72 of the circumferential wall 14. In the region of these two radially opposite connecting surfaces 78, 80, the two housing parts 56, 60 material fit, preferably by beam welding, such. B. electron beam welding, connected. As well as at the first axial end region 62, a gas-tight connection, which is continuous around the housing longitudinal axis L, of two mutually adjoining housing parts can thus be realized.

In the connection region 74 of the third housing part 60, heat transfer ribs 84 are provided on an inner side 82 of the circumferential wall 76 facing the housing interior 16. Preferably, the number of these heat transfer fins 84 corresponds to the number of the first heat transfer fins 72 on the inner side 20 of the peripheral wall 14, and the or at least part of the heat transfer fins 84 on the peripheral wall 76 is positioned such that these heat transfer fins 84 have heat transfer fins 22 on the inner side 20 of the peripheral wall region 14 continue in the direction of the housing longitudinal axis L. Since preferably the heat transfer fins 84 and the first heat transfer fins 22 have substantially identical cross-sectional profiles to one another, at least in their adjoining end regions, thus a substantially step-free transition between the first housing part 56 and the third Housing part 60 ensures, so that no impairment of the exhaust gas flow is formed in this adjoining area.

The third housing part 60 further has a mounting region 86 with a circumferential wall 88, which is offset radially outward with respect to the circumferential wall 76 of the connection region 74 and adjoins it in a step-like radial expansion region 90.

On the third housing part 60, a radially outwardly leading exhaust nozzle 52 is further provided in the region of the connecting region 74 and the peripheral wall 76 with an exhaust outlet opening 54 formed therein and open in the direction of the housing interior 16. Since the third housing part 60 has a comparatively complex structure, in particular with the exhaust nozzle 52 to be provided, which can not be produced with all its structural features in an extrusion process, this third housing part 60 is preferably provided as a cast component in a casting process. wherein, for example, for the third housing part 60, the same building material, as can be used for the first housing part 56, for example, aluminum or an aluminum-containing alloy. Also, the second housing part 58 may be constructed with the same construction material as the first housing part 56, and the third housing part 58th

The in the Fig. 5 and 6 illustrated embodiment of a heat exchanger housing 10 differs from the above with reference to the Fig. 1 to 4 described embodiment is substantially in the construction of the second housing part 58. This is constructed with a substantially dome-like and with respect to the housing interior 16 outwardly curved wall 92. In a radially outer edge region 94, this wall 92 has a radially inwardly oriented and around the housing longitudinal axis L interruption-free circumferential connection surface 96. In the first axial end region 62 of the first housing part 56, a radially outwardly oriented connection surface 98 is provided in association with this radially inwardly oriented connection surface 96, similar to the second axial end region 72. This can, much like in the second axial end region, provided by the fact that the second heat transfer ribs 26 or the radially outer region of the circumferential wall region 14 provided on the outer side 24 are removed in this longitudinal region. In the region of this with close fit opposite or abutting connecting surfaces 96, 98, the two housing parts 56, 58 material fit, preferably by beam welding, such. B. electron beam welding, gas-tight connected over the entire circumference.

On an inner side 100 of the wall 92 facing the housing interior 16 heat transfer ribs 102 are provided in association with the first heat transfer ribs 22 on the inner side 20 of the peripheral wall region 14. At least a portion of these, preferably all heat transfer fins 102 are positioned and / or dimensioned such that these first heat transfer fins 22 continue substantially continuously on the inner side 20 of the peripheral wall region 14. Thus, even in this area, in which the two housing parts 56, 58 adjoin one another, the exhaust gas flow in the housing interior 16 at the transition from the heat transfer ribs 102 to the first heat transfer ribs 22 is substantially not affected.

On a side facing away from the housing interior 16 outside 104 of the wall 92 of the second housing part 58 heat transfer ribs 106 are provided. These are preferably arranged or dimensioned such that at least a part of, preferably all heat transfer ribs 106 continue second heat transfer ribs 26 on the outer side 24 of the peripheral wall region 14 substantially continuously. Thus, the air flow on the outside of the heat exchanger housing 10 in the adjoining region of the two housing parts 56, 58 to each other is not substantially affected. One recognizes thereby in Fig. 6 in that, in the transition from the second heat transfer ribs 26 to the heat transfer ribs 106 on the wall 92, a gap-like gap may be present, which is essentially formed by the length region in which the two connection surfaces 96, 98 overlap one another. To avoid this gap-like gap, For example, the heat transfer ribs 106 provided on the outside 104 of the wall 92 could be guided in the direction of the housing longitudinal axis L into that region of the wall 92 in which the radially inwardly oriented connection surface 96 is provided.

Since that too in the Fig. 5 and 6 shown second housing part 58 has a comparatively complex, not in an extrusion process geometry, this is also preferably produced as a cast component in a casting process, in which case the same construction material as for the first housing part 56 and the third housing part 60 can be used.

With the above-described, multi-part construction of a heat exchanger housing, it becomes possible to produce each of the housing parts with the optimum geometry and structure for this in an independent manufacturing process. In particular, since the first housing part is such that it has a substantially constant over its entire axial length cross-sectional geometry, this first housing part can be made in an extrusion process, which leads to a better material quality and avoids the introduction of a Entformungsschräge. Only in those axial end regions, where, due to the structure of a respectively adjacent housing part, a radially oriented connection surface is to be provided, is a mechanical or machining post-processing of such an extrusion component necessary in order to produce the area required for the production of the welded connection. Since the first housing part can be provided as an extruded component, this can be adapted in a simple manner to different dimensions of a heat exchanger housing to be constructed by appropriately sized lengths are separated from a strand produced by the extrusion process. Since a Entformungsschräge does not exist, has the peripheral wall area in all axial regions at the same radial distance from the flame tube, which favors the exhaust gas flow and improves the heat transfer capacity.

The other housing parts to be connected with such a first housing part, which, if required by the complex geometry of these components, for example as die-cast components, can be adapted to the structure of a respective heat exchanger housing to be fitted, so that ultimately a modular housing System can be provided, in which for different heater types, for example, different third housing parts can be combined with correspondingly shaped combustion subrack carrier areas with different sized first housing parts or differently designed second housing parts.

Claims (13)

1. Heat exchanger housing, in particular for a fuel operated vehicle heating device for heating air, comprising:

   - a circumferential wall area (14) elongated in the direction of a housing longitudinal axis (L) radially outwards surrounding a housing interior (16),

   - a bottom wall area (18) joining the circumferential wall area (14) in a first axial end region (62) of the circumferential wall area (14) and closing the housing interior (16) in an axial direction,

   - a combustion module support area (28) joining the circumferential wall area (14) in a second axial end region (72) of the circumferential wall area of (14),

   wherein the heat exchanger housing (12) comprises at least three housing parts (56, 58, 60), wherein a first housing part (56) substantially provides the circumferential wall area (14), a second housing part (58) substantially provides the bottom wall area (18) and a third housing part (60) substantially provides the combustion module support area (28), wherein the third housing part (60) comprises a circumferential wall (76) substantially axially continuing the circumferential area (14) in a connection area (74) to be connected to the first housing part (56), wherein first heat transfer ribs (22) extending in the direction of the housing longitudinal axis (L) are provided at an inner side (20) of the circumferential wall area (14) facing the housing interior (16), wherein the third housing part (60) comprises in its connection area (74) a connection surface (80) oriented radially outwards or radially inwards and peripheral about the housing longitudinal axis (L) without interruption, and comprises in an axial end region (72) of the circumferential wall area (14) to be connected to the third housing part (68), a connection surface (78) oriented radially outwards or radially inwards and peripheral about the housing longitudinal axis(L) without interruption, characterized in that
   heat transfer ribs (84) are provided at an inner side (82) of the circumferential wall (76) of the connection area (74), wherein heat transfer ribs (84) provided at the inner side (82) of the circumferential wall (76) of the connection area (74) continue first heat transfer ribs (22) provided at the inner side (20) of the circumferential wall (14) in the direction of the housing longitudinal axis (L).
2. Heat exchanger housing according to claim 1, characterized in that at an outside (24) of the circumferential wall area (14), facing away from the housing interior (16), second heat transfer ribs (26) extending in the direction of the housing longitudinal axis (L) are provided, wherein at least part of, preferably all first heat transfer ribs (22) or/and at least part of, preferably all second heat transfer ribs (26) have a substantially constant cross-section geometry in the direction of the housing longitudinal axis (L), wherein preferably the circumferential wall area (14) comprises at least in the length extension area of the provided heat transfer ribs (22, 26) in the direction of the housing longitudinal axis (L) a substantially constant radial dimension or/and wall thickness.
3. Heat exchanger housing according to one of the preceding claims, characterized in that in each axial end region (62, 72) the circumferential wall area (14) comprises a connection surface (78, 98) oriented radially inwards or radially outwards, peripheral about the housing longitudinal axis (L) without interruption.
4. Heat exchanger housing according to claim 2 and claim 3, characterized in that in the case of a connection surface oriented radially inwards in the axial extension area of the connection surface at the outside of the circumferential wall area, second heat transfer ribs are provided, or that in the case of a connection surface (78, 98) oriented radially outwards in the axial extension area of the connection surface (78, 98) at the inside (20) of the circumferential wall area (14), first heat transfer ribs (22) are provided.
5. Heat exchanger housing according to one of the preceding claims, characterized in that the first housing part (56) is an extruded component or/and in that the second housing part (58) comprises a preferably substantially flat plate (64) providing the bottom wall area (18).
6. Heat exchanger housing according to claim 5, characterized in that no heat transfer ribs are provided at an inside (68) of the plate (64) facing towards the housing interior (16) or/and at an outside of the plate (64) facing away from the housing interior (16), or/and that in a radially outer border region (66) of an inside (68) facing towards the housing interior (16) the plate (64) is connected to a front surface (70) of the circumferential wall area (14) oriented substantially in the direction of the housing longitudinal axis (L).
7. Heat exchanger housing according to one of claims 1-5, characterized in that the second housing part (58) comprises a substantially dome-shaped wall (92) providing the bottom wall area (18), preferably wherein heat transfer ribs (102) are provided at an inside (100) of the wall (92) facing towards the housing interior (16) or/and wherein the transmission ribs (106) are provided at an outside (104) of the wall (92) facing away from the housing interior (16).
8. Heat exchanger housing according to claim 2 and claim 7, characterized in that heat transfer ribs (102) provided at the inside (100) of the wall (92) continue first heat transfer ribs (22) provided at the inside (20) of the circumferential wall area (14) in the direction of the housing longitudinal axis L, or/and that heat transfer ribs (106) provided at the outside (104) of the wall (92) continue second heat transfer ribs (26) provided at the outside (24) of the circumferential wall area (14) in the direction of the housing longitudinal axis (L).
9. Heat exchanger housing according to one of claims 6-8, characterized in that in a radially outer border region (94) of the wall (92) a connection surface (96) is provided oriented radially outwards or radially inwards, peripheral about the housing longitudinal axis (L) preferably substantially without interruption.
10. Heat exchanger housing according to one of the preceding claims, characterized in that the second housing part (58) is a stamped or cut component or a cast com ponent.
11. Heat exchanger housing according to one of the preceding claims, characterized in that in the connection area (74) an exhaust gas outlet opening (54) passing through the circumferential wall (76) is provided, or/and in that the third housing part (60) comprises a mounting area (86) joining the connection area (74) in a radial expansion area (90) with a circumferential wall (88) at least partly offset radially outwards in relation to the circumferential wall (76) of the connection area (74).
12. Heat exchanger housing according to one of the preceding claims, characterized in that the third housing part (60) is a cast component or/and in that the first housing part (56) is connected to the second housing part (58) or/and the third housing part (60) by beam welding, preferably by electron beam welding.
13. Vehicle heating device, comprising a heat exchanger housing (10) according to one of the preceding claims, wherein a combustion air blower or/and a combustion chamber module are supported in the combustion module support area (28).

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