Gas cooler

Abstract

Gas cooler, in particular for a motor vehicle, comprising a plurality of parallel stacked, gas-flowing tubes, at least one tube sheet (2), and at least one housing part (3, 4, 11, 12) for forming a jacket of the tubes through which cooling fluid flows, wherein the ends of the tubes are received in openings (2b) of the tube sheet (2), and wherein a termination edge (5) of the housing part (3, 4, 11, 12) is received flush in a guide (2a) of the tube sheet (2), characterized in that at least one locking element (8) connected to the termination edge (5) is provided, wherein the locking element (8) extends at least completely through the tube sheet (2) in the area of ​​an outer tube in the direction of the tube.

Description

[0001] The invention relates to a gas cooler, in particular for a motor vehicle, according to the preamble of claim 1.

[0002] Increasingly, charge air coolers and / or exhaust gas coolers, collectively referred to here as gas coolers, are operated as indirect coolers. In a common design, a cooling fluid, such as engine coolant, flows around a bundle of heat exchanger tubes through which the gas to be cooled is conveyed.

[0003] DE 10 2006 043 526 A1 describes such an intercooler or exhaust gas cooler, wherein a water jacket carrying the cooling fluid is formed by several housing parts that at least partially enclose a bundle of rectangular-section heat exchanger tubes. Such coolers are regularly manufactured in such a way that the heat exchanger tubes, the housing parts, and tube sheets arranged at the ends of the heat exchanger tubes are mechanically pre-assembled as a heat exchanger network and then soldered together fluid-tight in a soldering furnace.

[0004] The object of the invention is to provide a gas cooler that can be soldered in a particularly process-reliable and fluid-tight manner using simple means.

[0005] This problem is solved according to the invention for a gas cooler mentioned above, with the characterizing features of claim 1. By providing the locking element, which at least completely penetrates the guide on the tube sheet, a positive locking mechanism is easily achieved to close any gap that may remain due to the flush arrangement of the housing part on the tube sheet, so that a fluid-tight and reliable soldering can take place at the point of locking by the locking element. Depending on the requirements, a particularly large quantity of solder can also be delivered to the soldering joint by shaping and designing the locking element.

[0006] In a generally preferred embodiment of the invention, the housing part is soldered, at least partially, to preferably one of the outer tubes over a flat surface. This partial, flat soldering allows the housing part to provide a seal for the fluid-filled space or water jacket with respect to the outer tube. The arrangement of the locking element at this point sealing the water jacket is particularly advantageous for achieving a seal between the water jacket and the outside environment.

[0007] In a preferred embodiment of the invention, the locking element engages in a recess in the tube head that is flush with the end edge. This allows not only complete penetration of the guide but also a projection of the locking element beyond the guide, resulting in a particularly good seal. Furthermore, the engagement of the locking element in the recess can have other positive effects, such as adjustment and / or retention during the mechanical pre-assembly of the components before placement in the soldering furnace.

[0008] In an alternative or supplementary embodiment, the recess opens into the passage of, in particular, an outer heat exchanger tube. This allows for a simple and effective, flat connection of the locking element, located in the recess, to the outside of the heat exchanger tube during the soldering process. Depending on the requirements, the recess can be provided on either a narrow or wide side of the outer heat exchanger tube.

[0009] It is generally advantageous for the locking element to be soldered to the surface of the tube over a flat area. This ensures that a large quantity of solder is transported to the solder joint and, due to the guide's penetration, simultaneously creates a seal between the gap, the locking element, and the tube surface. In a particularly preferred design, the locking element can have a cross-sectional shape adapted to the tube's surface. For example, in the case of a rectangular tube with flat wide and narrow sides, the locking element can be shaped as a tab with a flat surface. Conversely, in the case of a rectangular tube with curved narrow sides, bending the locking element to conform to the shape of the narrow side can improve the soldering. Furthermore, this prevents undesirable deformation of the tube inserted into the through-hole during the assembly of the housing part with the locking element.

[0010] In one possible embodiment of the invention, the housing part has lateral bends that are soldered flat to a side wall of the outer tubes. Particularly in such an embodiment, depending on requirements, alternative or supplementary locking elements can be provided in the area of ​​the side wall of the outer tubes or the bends of the housing part. Frequently, the side walls of the outer tubes are designed as the broad sides of the tubes. However, the locking element can also be arranged outside the lateral bends on the housing part, in which case it usually rests against the narrow sides of the outer tubes.

[0011] In an alternative embodiment of the invention, the housing part covers a plurality of the stacked tubes on their narrow sides, without encompassing the outer tubes of the stack. For example, the housing part can be designed as a flat plate in which, optionally, collector channels and / or connections for the cooling fluid are formed by deep drawing or other means. Because the housing part does not encompass the outer tubes, dimensional tolerances in the height of the tube stack are less critical. Furthermore, the assembly or clamping of the components before placement in the brazing furnace can be simplified, since any mechanical tension of the housing part on the tube stack within the range of dimensional variations is independent of the stack height.

[0012] In a preferred embodiment, the casing consists of at least two housing parts, each bearing only on the narrow sides of the tubes. Preferably, but not necessarily, at least two further housing parts are provided, which form an overlap of the broad sides of the outer tubes. Depending on the specific embodiment, the two housing parts bearing on the narrow sides have locking elements according to the invention for improved and fluid-tight soldering. The side parts can also have locking elements to ensure, for example, a reliable and tight soldering connection in the area of ​​the gap between the consecutive rows of heat exchanger tubes in multi-row coolers.

[0013] In a preferred embodiment of the invention, at least one lock member is designed as a projecting tab on the end edge of the housing part. This makes the lock member particularly easy and reliable to manufacture.

[0014] In an alternative or supplementary design, at least one lock link can be configured as a T-nut soldered to the base and the housing part. Due to its nature as a separate component, such a T-nut may require more effort during mechanical assembly, but offers advantages in soldering. For example, it can be designed with a particularly thick solder plating to ensure a secure and sufficient solder joint at the critical point of the lock link.

[0015] In a further alternative or supplementary embodiment, at least one locking element can be designed as a lug projecting from the base over at least the height of the guide, with a corresponding recess in the housing part formed in the end edge. This can offer the advantage, for example, that any soldering defects during the production process are later more easily visible from the outside. Another advantage lies in the large quantity of solder available. It is understood that the aforementioned three alternatives for shaping the locking element on the same heat exchanger can be used in combination with one another.

[0016] Depending on the requirements, the tubes of a gas cooler according to the invention can be arranged in a single-row or multi-row bundle of flat tubes. Particularly when configured as a double-row bundle of flat tubes, the cooler can be designed as a U-flow heat exchanger in a known manner, for example by means of a deflection section arranged on one of the ends.

[0017] It is generally understood that the inventive design relates to the heat exchanger network consisting of tube sheets, tubes, and housing components for forming the water jacket. Diffusers can be arranged on the outside of the tube sheets and, depending on requirements, can also be soldered to the heat exchanger network in the same soldering process. However, the heat exchanger network can also be used without diffusers, and in particular without further components, for example, as an indirect charge air cooler in an intake manifold module, preferably with a plastic housing.

[0018] Further advantages and features of the invention will become apparent from the exemplary embodiments described below and from the dependent claims.

[0019] Several preferred embodiments of the invention are described below and explained in more detail with reference to the accompanying drawings.

[0020] Fig. Figure 1 shows an exploded view of a state-of-the-art gas cooler.

[0021] Fig. 1a shows a partial sectional view of the gas cooler made of Fig. 1 in the area of ​​a tube sheet.

[0022] Fig. Figure 2 shows the heat exchanger network of a gas cooler according to the invention in a first embodiment.

[0023] Fig. Figure 3 shows a close-up of the gas cooler. Fig. 2.

[0024] Fig. Figure 4 shows a spatial view of an upper housing part of the gas cooler. Fig. 2.

[0025] Fig. Figure 4a shows a spatial view of a modification of the housing part made of Fig. 4.

[0026] Fig. Figure 5 shows a top view of a tube sheet of the gas cooler. Fig. 2.

[0027] Fig. Figure 6 shows a top view of the gas cooler. Fig. 2.

[0028] Fig. Figure 7 shows a detail of a cross-sectional view of the gas cooler. Fig. 6 along line CC.

[0029] Fig. 8a to Fig. Figure 8c shows different variations of a locking element of the gas cooler. Fig. 2 regarding the depth of penetration.

[0030] Fig. 8d to Fig. Figures 8f show various modifications of the tube sheet of the exemplary embodiment from Fig. 2 regarding the width of a recess.

[0031] Fig. 9a and Fig. Figure 9b shows two variations in the shape of lock links adapted to the shape of narrow sides of exchanger tubes.

[0032] Fig. Figure 10 shows a partial sectional view of another embodiment of the invention, in which the lock member is designed as a separate T-nut.

[0033] Fig. Figure 11 shows a side view of a further embodiment of the invention, in which the lock members are arranged on a broad side of the outer heat exchanger tubes.

[0034] Fig. Figure 12 shows an upper housing part of the exemplary embodiment. Fig. 11.

[0035] Fig. Figure 13 shows a front-view top view of a base of the exemplary embodiment. Fig. 11.

[0036] Fig. Figure 14 shows a spatial exploded view of a further embodiment of the invention, in which two upper housing parts and two side housing parts are provided.

[0037] Fig. 15 a spatial view of a further embodiment of the invention with two rows of heat exchanger tubes.

[0038] Fig. 16 shows the example from Fig. 15 omitting housing parts.

[0039] Fig. Figure 17 shows a top view of a side housing part of the embodiment from Fig. 15.

[0040] Fig. Figure 18 shows a top view of a tube sheet of the exemplary embodiment from Fig. 15.

[0041] Fig. Figure 18a shows a detailed magnification of area A from Fig. 18.

[0042] Fig. Figure 19 shows another embodiment of a two-row gas cooler.

[0043] The in Fig. 1 and Fig. The gas cooler shown in 1a, according to the state of the art, consists of a stack of rectangular tubes. 1 constructed, between which spacers (not shown) and flow-modifying devices are arranged. The flat tubes have a rectangular cross-section. 1 are in end-face tube sheets 2 in the passages provided therein 2b plugged in.

[0044] This stack of heat exchanger tubes 1 is from an upper housing part 3 and a lower housing part 4 surrounded each of the housing parts 3 , 4 is a sheet metal part with laterally bent folds 3a , 4a formed so that each one has a U-shaped cross-section. The bends 3a , 4a encompass the outer rectangular tubes 1 and lie on the broad sides of the outer rectangular tubes 1 spread over a large area.

[0045] By means of deep drawing or other suitable measures, bulges are created in at least one of the housing parts. 15 provided, which also have connections 15a They have openings for the supply and discharge of liquid coolant. These openings are located via the two recesses. 15 of the upper part of the housing 3 according to Fig. 2. Coolant is distributed over the entire height of the pipe stack in the manner of collectors, flowing through the spaces between the stacked pipes. 1 and appears after collection in the opposite form 15 off again.

[0046] The housing parts formed from sheet metal 3 , 4 have the tube sheets 2 opposite end edges 5 , with which they butt-jointly against the pipe heads 2 issue.

[0047] Fig. 1a shows that the tube sheets are used for this purpose. 2 a lead in the form of a continuous advantage 2aexhibit, so that the finishing edges 5 between the lead 2a and the surfaces of the narrow sides of the heat exchanger tubes 1 are inserted. Fig. Figure 1a shows the sectional view at the level of a heat exchanger pipe. 1 The end edges are located in the free area between the heat exchanger tubes. 5 only the lead 2a on. In the area of ​​the bends 3a , 4a The butt joint is installed in the same way, with one broad side of one of the outer flat tubes abutting against it on one side.

[0048] Due to unavoidable dimensional tolerances and deformations of the components, an air gap remains at least in some sections. 6 between the ground 2 , the lead 2a , the finishing edge 5 and the surfaces of the heat exchanger tubes 1 Another part of the air gap 6 is achieved through the normally provided insertion ramps.7 the passages 2b the soils 2 contributed.

[0049] This air gap is caused by the flush butt joint. 6 This also applies to the area of ​​bends. 3a on.

[0050] Due to dimensional tolerances, variations, and fluctuating solder distribution during the soldering process, coolant leakage into the surrounding area can occur in extreme cases. Areas prone to such leakage include, for example, the butt joints of bent sections. 3a , 4a the upper and lower housing parts 3 , 4 .

[0051] A first embodiment according to the invention is described in Fig. 2 shown. For controlled closure of the air gap. 6 The upper and lower housing parts exhibit this 3 , 4 in the area of ​​the plant on the narrow sides of the outer pipes 1protruding tabs of the stack of exchanger tubes 8 on, which guides the soils 2 , which are located between the projecting ledges 2a and the narrow sides of the flat tubes 1 is trained to take full action.

[0052] This is found in the soils 2 at the edge of the passages 2b the outer pipes 1 Each exception 9 on the narrow sides of the passages 2b provided into which the tabs 8 the housing parts 3 , 4 intervene. Thus, the tabs 8 lock links according to the invention are formed, which provide guidance 2a in the area of ​​an outer pipe, at least completely penetrate in the direction of the pipe.

[0053] In the section view Fig. 7 shows that the tabs 8 according to the first embodiment of the invention, the air gap 6completely form-fitting, covering the area and extending far into the cross-section of the floor. 2 reach in. The recess 9 in the area of ​​the passage through the outer pipes 1 This penetrates the ground 2 across its entire thickness. The flap 8 protrudes (see Fig. 7) only almost completely over the entire thickness of the soil 2 into the recess 9 inside.

[0054] Through this intervention of the tabs 8 into the recesses 9 the soils 2 , where the tabs 8 each area on the narrow sides of the outer heat exchanger tubes 1 By placing them on top and soldering them accordingly, a reliable seal against any remaining air gap will be achieved. 6 at least over the narrow sides of the outer heat exchanger tubes 1 guaranteed.

[0055] Regarding the design of the heat exchanger according to Fig. 2 to Fig. 7 will be a respective upper and lower housing part. 3 , 4 with each of the narrow sides of the stack of rectangular flat tubes 1 The surface is soldered. Furthermore, the lateral bends are also soldered over a surface. 3a , 4a with the respective broad sides of the outer flat tubes of the stack 1 Instead, a reliable closure of the air gap. 6 , without prejudice to any dimensional tolerances, is achieved primarily through the tabs 8 over the narrow sides of the outer flat tubes.

[0056] In an alternative embodiment not shown, the tabs 8 in the area of ​​the bends 3a , 4a be arranged so that the air gap is reliably closed 6 in the area of ​​the broad sides of the outer flat tubes 1 This has been done.

[0057] Another modification of the invention is in Fig. 4a shown, with the tabs 8 In the area of ​​the outer flat tubes, there are also additional tabs arranged in the area of ​​the middle flat tubes. 8' over the finishing edges 5 the housing parts 3 , 4 These additional flaps protrude. 8' can be placed in corresponding recesses (not shown) in the floors 2 intervene, whereby these recesses are made in the same way, preferably in the same operation as the side recesses. 9 are manufactured. In general, such interlocking of the additional tabs serves a purpose. 8' into corresponding recesses in the floors 2 not primarily a sealing of the air gap 6 , but rather a mechanical aid during the pre-assembly and positioning of the components. In particular, it can be necessary due to bulges and bends in the finishing edges. 5 the housing parts 3 , 4This leads to simplifications in mechanical assembly if such additional tabs are used. 8' are planned.

[0058] Regarding the intended width of the tabs 8 and their length or depth of penetration through the soils 2 Several variations are conceivable:

[0059] Fig. 8a shows a tab 8 , which, according to their dimensions, form the recess 9 in the ground 2 exactly and completely.

[0060] In the variant according to Fig. 8b the partial extension or tab is urgent 8 the housing parts 3 , 4 the pipes during cassetteting, so that the bottom through the tabs 8 is positioned. This simplifies the cartridge assembly process of the gas cooler.

[0061] In the variant according to Fig. 8c is the length of the tab 8 smaller than the thickness of the soil 2, which improves solderability, as more solder from the heat exchanger tubes is available to fill the solder gap between the tabs. 8 and is available to the ground. It should be taken into account that the housing parts 3 , 4 preferably only plated on one side or not at all with solder, so that, depending on the requirements, the entire solder is supplied from the heat exchanger pipes and / or the ground.

[0062] Regardless of the length of the tabs 8 In a further preferred embodiment, these can be combined with the recess 9 They must be crimped to ensure a mechanically secure connection and positioning of the housing parts. 3 , 4 opposite the ground 2 to ensure this during the soldering process in the soldering oven. Such caulking can be achieved, for example, by targeted deformation of the material in the recesses. 9 inserted tabs 8This can be done. With suitable gas cooler designs, such caulking can even completely eliminate the need for mechanical clamping of the heat exchanger mesh before insertion into the soldering furnace.

[0063] Fig. 8d to Fig. Figures 8f show three variations of the width of the recess. 9 or the tabs 8 relative to the width of the passages 2b . This shows Fig. 8d a variant in which the recess 9 narrower than the width of the passage 2b or the narrow side of the heat exchanger tube 1 In this variant, the recess can be... 9 in the ground, it is particularly easy to produce, for example by simply punching out a rectangular groove with an undersized dimension from the opening. 2b .

[0064] In the variant according to Fig. 8e is the exception 9 exactly as wide as the narrow side of the heat exchanger tube 1or the width of the passage 2b In the variant according to Fig. 8f is the exception 9 wider than the narrow side of the exchanger tube 1 or the width of the passage 2b Such exceptions 9 as in Fig. 8e and Fig. 8f may be more complex to manufacture, but result in a particularly secure soldering and sealing of the air gap. 6 .

[0065] In Fig. 9a and Fig. 9b are two variations of the shape of the pipes 1 and the lock links 8 schematically represented as a cross-sectional view. In the case of the Fig. 9a the pipes are rectangular tubes with flat narrow sides 1a shaped so that the tabs 8 for the most even and stress-free installation possible on the narrow sides 1a have a flat contact surface. In the case of the modification of the Fig. 9b are the narrow sides 1aThe pipes, on the other hand, are convexly curved, with the tabs 8 For better coverage, they have a cross-section adapted to this, which is rounded in sections.

[0066] Fig. Figure 10 shows a partial sectional view through another embodiment of the invention. Here, the lock member is 8 as to the housing part 3 as well as the ground 2 An additional, separate component is designed in the form of a T-nut. This component has a recess. 9 in the ground 2 formed in the manner already described. In addition, there is a recess. 10 in the area of ​​the finishing edge 5 of the housing part 3 provided into which the nut stone 8 also intervenes. Alternatively or additionally, the T-nut can be used. 8 it may also be provided with a profile into which the finishing edge 5 intervenes.

[0067] One advantage of designing the lock element as a T-nut. 8 Depending on the requirements, the advantage lies in the fact that the T-nut can be provided with a thicker solder plating. This allows it to supply a particularly large amount of solder in the area of ​​critical soldering and sealing of the air gap. 6 ready.

[0068] At the in Fig. In the embodiment of the invention shown in 11, the lock links differ from those in the embodiments described above. 8 not on the narrow sides of the outer pipes 1 arranged, but on their broad sides. Another difference from the first embodiment and from the embodiment according to Fig. The lock links comprise 10 8 here, made of a single, uniform material, attached to the floor. 2 well-developed, protruding noses that fit into corresponding recesses 9 intervene, which are located at the finishing edges 5the lateral bends 3a , 4a the housing parts 3 , 4 are planned. These noses too. 8 protrude beyond the entire height of the maximum expected air gap 6 between the ground 2 and the finishing edge 5 the housing parts 3 , 4 before.

[0069] It goes without saying that the formation of the lock links as from the ground 2 Projecting noses, analogous to the first embodiment, can also be additionally or alternatively located on the narrow sides of the pipes. 1 It may be provided for. Conversely, it may be provided that the formation of the lock links 8 as from the housing parts 3 , 4 projecting tabs according to the first embodiment also on the broad sides of the outer heat exchanger tubes 1 or at the bends 3a , 4a the housing parts 3 , 4This is provided for. Combinations of different lock link configurations are also possible in the same embodiment. 8 These basic designs include projecting tabs on the housing parts, projecting lugs on the bases, or separately formed T-nuts (see Fig. 10).

[0070] At the in Fig. The embodiment shown in 14 is the lock links. 8 as in the first embodiment as from the upper and lower housing parts 3 , 4 Projecting tabs are formed that are flush with the narrow sides of the outer tubes. 1 soldered. In contrast to the first embodiment, the upper and lower housing parts 3 , 4 They have no lateral bends, but only lie on the narrow sides of the pipes. 1 to.

[0071] An overlap of the broad sides of the outer exchanger tubes 1is formed by two additional side panels, essentially rectangular in shape 11 , 12 carried out. In this embodiment, the housing of the heat exchanger network thus consists of four housing parts. In the single-row design according to Fig. 14. It is understood that a basic function of the gas cooler is already possible without the outer side panels. 11 , 12 This is given because the broad sides of the exchanger tubes 11 Regarding the fluid flows, the water jacket already forms a boundary. The side panels 11 , 12 are nevertheless advantageous in order to protect the thin-walled exchanger tubes against damage and to facilitate the manufacture of the heat exchanger block.

[0072] In the exemplary embodiment according to Fig. 15 to Fig. 18a is located, as in the example, after Fig. 14. The housing consists of a total of four housing parts, namely an upper and a lower housing part. 3 , 4 as well as two side housing parts 11 , 12 In contrast to the previous embodiments, here the gas cooler is designed as a double-row heat exchanger, so that it is perpendicular to the stacking direction of the flat tubes. 1 Two rows of flat tubes are arranged one after the other. A gap remains between these two rows of flat tubes. 12 , which, in contrast to the embodiment according to Fig. 14 through the side panels 11 , 12 It must be sealed to be fluid-tight.

[0073] For this purpose, it is expedient that the side panels 11 , 12 also lock components, in this case in the form of projecting tabs 8 , exhibiting features by which a reliable closure of any remaining air gap can be achieved6 in the area of ​​the finishing edges 5 the side housing parts 11 , 12 effect. A side view of one of the side panels. 11 , 12 with the appropriately shaped tabs or lock links 8 is in Fig. 17 shown.

[0074] Fig. Figure 18 shows a top view of the ground. 2 of the exemplary embodiment Fig. 15, which makes it clear (see also detailed enlargement) Fig. 18a), that not only exceptions 9 are provided in the area of ​​the narrow sides of the outer heat exchanger tubes to protect against the upper and lower housing parts 3 , 4 sealing work carried out with regard to the air gap 6 to ensure this. Rather, the gap remaining between the rows of heat exchanger tubes is also present. 13 corresponding exceptions 9 in the broad sides of the outer passages 2aplanned, such as the detailed magnification Fig. 18a shows.

[0075] It goes without saying that a two- or multi-row design of the gas cooler can alternatively also be achieved with housing parts featuring bends. 3a , 4a This is possible. This shows Fig. 19 A side view of such a gas cooler. For reliable sealing of the gap 13 between the rows of heat exchanger tubes 1 This includes an additional housing part. 14 provided for, which the gap 13 covered and between the bends 3a , 3 , 4 This additional housing part runs 14 can be similar to the side housing parts 11 , 12 of the exemplary embodiment Fig. 15 be provided with lock elements according to the invention.

[0076] It is generally understood that the specific features of the individual embodiments can be combined with each other depending on the requirements. QUOTES INCLUDED IN THE DESCRIPTION

[0077] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0078] DE 102006043526 A1

[0003]

Claims

[1] Gas cooler, in particular for a motor vehicle, comprising a plurality of parallel stacked tubes through which gas flows ( 1 ), at least one tube sheet ( 2 ), and at least one housing part ( 3 , 4 , 11 , 12 ) to form a jacket of the pipes ( 1 ), where the ends of the tubes ( 1 ) in drafts ( 2b ) of the tube sheet ( 2 ) are included, and where a closing edge ( 5 ) of the housing part ( 3 , 4 , 11 , 12 ) in a guided tour ( 2a ) of the tube sheet ( 2 ) is mounted flush, characterized , that at least one with the terminal edge ( 5 ) connected lock link ( 8 ) is provided, wherein the lock member ( 8 ) the soil in the area of ​​an outer tube in the direction of the tube ( 1 ) at least fully prevails. [2] Gas cooler according to claim 1, characterized in that the housing part ( 3 , 4 , 11 , 12 ) at least partially flat with in particular an outer one of the tubes ( 1 ) is soldered. [3] Gas cooler according to claim 1 or 2, characterized in that the lock member ( 8 ) into a recess ( 9 ) of the tube sheet ( 2 ) intervenes. [4] Gas cooler according to one of claims 1 to 3, characterized in that the recess ( 9 ) into the ground ( 2 ) in particular an outer exchanger tube ( 1 ) opens. [5] Gas cooler according to one of the preceding claims, characterized in that the lock member ( 8 ) with a surface ( 1a ) of the pipe ( 1 ) is soldered flat. [6] Gas cooler according to claim 5, characterized in that the lock member ( 8 ) one of the surface of the tube ( 1 ) has an adapted cross-sectional shape. [7] Gas cooler according to one of the preceding claims, characterized in that the housing part ( 3 , 4 ) lateral bends ( 3a , 4a ) which is flat with a side wall of outer tubes ( 1 ) are soldered. [8] Gas cooler according to one of claims 1 to 6, characterized in that the housing part ( 3 , 4 ) a plurality of the stacked tubes ( 1 ) on narrow sides ( 1a ) of the pipes covered, whereby the housing part ( 3 , 4 ) the outer tubes ( 1 ) of the stack does not encompass. [9] Gas cooler according to claim 8, characterized in that the jacket consists of at least two housing parts ( 3 , 4 ), which only exist on the narrow sides ( 1a ) of the pipes rest, in particular at least two further housing parts ( 11 , 12 ) an overlap of broadsides of the outer tubes ( 1 ) train. [10] Gas cooler according to one of the preceding claims, characterized in that at least one lock member ( 8 ) as a protruding tab at the end edge ( 5 ) of the housing part ( 3 , 4 , 11 , 12 ) is trained. [11] Gas cooler according to one of the preceding claims, characterized in that at least one lock member ( 8 ) than with the ground ( 2 ) and the housing part ( 3 , 4 ) soldered sliding block is formed. [12] Gas cooler according to one of the preceding claims, characterized in that at least one lock member ( 8 ) than from the ground ( 2 ) over at least the amount of leadership ( 2a ) protruding nose is formed, in which the end edge ( 5 ) one to the nose ( 8 ) corresponding recess ( 9 ) is trained. [13] Gas cooler according to one of the preceding claims, characterized in that the tubes ( 1 ) are arranged to form a single-row or multi-row bundle of flat tubes.

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