JPS58114827A - Manufacture of hollow flow section form - Google Patents

Abstract

In order to simplify the manufacture of flow sections, e.g. for use in the matrix of a heat exchanger or as vanes or blades in turbomachines the following steps are performed during manufacture: a) thickenings (2', 3) are formed at preselected points over the circumference of a tube (1) having a substantially circular, square or polygonal cross-section; b) the tube is deformed so that the thickenings (3) are situated adjacent leading and trailing edges of the flow section (8) and other thickenings (2') form opposed separating webs; c) the opposed webs are then joined, e.g. by welding or brazing, to form at least two separate air ducts (9, 10) in the flow section. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hollow, aerodynamically optimally formed nine-flow cross-section, the outer thorax of which is designed to contain the working medium of the body during operation. This article relates to a method for manufacturing a one-sided flow system in which a second operating medium (pressurized air) flows straight through a pipe line existing in a flow cross-sectional shape.

A hollow flow cross-section of the type described above is provided in the case of a heat exchanger as is known from DE 29 07 810 A1. In the case of this known heat exchanger, a collecting pipe is provided, which collects into two mutually separated nine-pressure air guide sections. The compressed air supplied through one of the compressed air guides is guided into the spatula-shaped flow section I11, where it is heated by hot gas, and in its preheated state, the other The preheated air passes through the other compressed air guide and is then sent to the consumer, i.e. combustion, for example in a gas turbine drive. , a heat exchanger formed by a spatula-shaped flow cross-section-ff)'J box has a horizontal KU-shape projecting from the collecting pipe.

Also, the flow cross-sectional shape as described above is used for example in a turbo machine, such as a gas turbine drive device. During operation of a machine, for example, in the case of a turbine, the rotor blade, in which hot gas flows through one of the blades, is cooled by the high-pressure air exiting the compressor by means of cooling pipes located inside it.

Created a method suitable for manufacturing the above-mentioned flow cross-section that can create a flow cross-section that has high thermal stability and has the necessary strength and static strength to withstand high-level use. There are still considerable difficulties in doing so. Second, the flow profile described above requires a smooth outer wax that does not cause aerodynamic interference.

Experimentally, such flow cross-sections have already been produced from so-called half-sections. The backs of the half-sections are aligned with each other and are joined by longitudinal joints, either by overlap or by means of joints.5 In this case, the difficulties arising in terms of manufacturing technology are considerable.

That is, the half-spatula-like cross-sectional shape is asymmetric and therefore extremely difficult to create with a pull-out bladder.

Also, there is a gap in the spine-to-spine connection of the semi-spiral cross-section, insofar as there are seams or corners in the outer profile that pose a non-negligible aerodynamic disturbance.

Moreover, the longitudinal joints, ie bath welding or soldering joints, which are made in the above-mentioned manner and are met in a nine-section joint, are exposed to the corrosive action of the constantly acting hot gases.

Furthermore, the ends of the double cross-sectional shape made as described above are formed into a desired circular connection part as required, for example, in the case of the heat exchanger, the IthI] shape is connected to the central collecting pipe IIC. This is not possible with the experimentally created flow cross-sections as described above.

The problem of the present invention is to address the following nine problems in a relatively simple way, considering the necessary strength requirements and, in some cases, how best to cope with varying pressure and thermal stresses. The objective is to create a nine-flow cross-section, ie a hollow cross-section, which is aerodynamically advantageous in its ability to withstand.

Furthermore, the hollow sections produced must be able to guarantee a fairly long service life under conditions of low corrosion susceptibility.

Furthermore, the manufacturing method according to the invention makes it possible to locally deform, in particular the ends of the flow profile, for example to round off the desired connections, without damaging the already completed basic structure of the flow profile. It has to be something.

The wiring problem is essentially a pipe with a circular cross section, a pipe with a square cross section, or a pipe with a polygonal cross section. Then, by pulling or rolling the pipe, one of the material accumulation parts is poured into the end corner areas of the inflow and outflow sides of the flow cross section and the wall reinforcement on the outflow side. , and the other material accumulation part is welded,
This is particularly achieved by the fact that it can be fixed together at the meridian (3) by brazing or the like.

The upper part of the present invention is hollow, and according to its use, has a flow #T (3) shape that is aerodynamically formed,
During operation, the first working medium (hot gas) flows through the outside part, and the first working medium (hot gas) flows through the outside part during operation. In the manufacturing method of the flow cross-sectional shape in which the second manufacturing medium (pressurized air) is passed through the pipe existing inside the f1-plane shape, (IL) the process south of the circular cross-section, the square- forming in a tube with a cross-section or a tube with a polygonal cross-section by means of an exaggerated method a predetermined position, in particular at a uniformly distributed position around the tube, (b) ) Then, by pulling or pressing the pipe, one of the material accumulation parts cuts the wall reinforcement part of the inflow side and the outflow side (3) into the end corner area of the inflow side and the outflow -j. At least two mutually separated compressed air guide channels, each of which has a volume of 1 ml, can be formed and formed, and the other material accumulation part can be defined by bath contact, mounting, etc. Another advantageous formation of the subject matter of the invention, which is a method for manufacturing a hollow flow cross-section, characterized in that it is deformed to form a branch line projection for the purpose of the present invention, is defined in claims TS2 to 11. That's exactly what I did.

The essential advantages of the method of the invention are that the requirements for flow profile 1%, aerodynamics 2 strength, and requirements for thermal stability are already at the starting point of the method of the invention (%W!fii
(a)) in the range of 1N, and in principle, the finished product does not require any additional processing, and the flow base cross section formed in this way is The shape is used, for example, as a stationary vane or a moving pallet of a turbine, in which case it is possible to carry out the necessary true precision shaping, in particular the necessary twist of the blade, or the above-mentioned known heat exchanger. For example, the guide connections necessary for use in containers can be formed at the ends of the cross-section.

Another essential advantage of the invention is that due to the distribution and formation of the material accumulation, the tube (section (&) in claim 1) is carried out at the starting point of the method according to the invention, and Finally, through another deformation process the finish is shaped with respect to its inner structure (as a hollow cross-section) as a principle finished product - and compressed air (in the case of a heat exchanger) is heated in a heat exchange process. ) or to have corresponding mutually separated duct guides for guiding the cooling air (in the case of the Seimata II #JJ wing) through it more slowly.

Starting from a circular or hook-shaped wire, according to the method of the present invention, protruding material accumulations are formed in predetermined positions by a suitable deformation method (pulling, rolling, rolling, etc.). is formed. With suitable materials, cross-sections shaped in this way can also be obtained by hot pressing or extrusion. The protrusions may be formed on the outside or on the inside of the tube or on both sides, depending on the appropriate needs of the process to be carried out before or after.

The deformation of the ablation to the flow profile is then carried out by drawing or rolling. At that time, several methods are carried out along the way according to the needs. The protrusions thus formed in the sense mentioned above are the necessary material accumulation areas 1 at two or three positions of the cross-section, for example, the material accumulation areas at the front and rear wheel corners and intermediate protrusions of the hollow cross-section. It can be used as Finish forming is also carried out in some steps, optionally using internal processing tools. The final shaping of the cross-section is carried out by co-compression and welding of the inner projections, for example, by the rolling action of a so-called pipe welder; the cross-section thus formed can be made to any desired length. Said protrusions which partially provide or separate the conduits located inside the cross-section serve a static function of removing forces from the pressure of the medium flowing inside and a function of improving heat transfer.

Pass a turbulence-exciting contoured sheet metal strip longitudinally inside the cross-section and weld or braze it before welding or brazing the protrusions as necessary to improve heat transfer. It is fixed as a structure between the protrusions.

For example, to produce torsable flow profiles for turbine vanes and rotor blades, the individual profile pieces can be forged with a corresponding die after cutting to a corresponding length.

Regarding the concept of "several processes" in the introduction method, these are necessary when the degree of deformation is limited due to material properties (strength) and, for example, intermediate annealing is introduced. Additionally, the fluidity of the material during molding, for example, must be taken into account. It requires several intermediate forming steps to obtain the finished shape. In the case of finished shapes that sometimes deviate from circular, locally increased forces on one side (e.g. forces at radii and corners of small shapes) are limited and the finished shape is obtained through several intermediate O-forming steps. This is necessary to minimize tool wear.

To connect flow profiles to other structural components,
For example, circular ends with a flow cross-section are desirable, for example for connecting tubes of heat exchangers to the bases of connecting pipes and distribution pipes. In the case of the method described above, such a rounded connection end is formed through the following intermediate steps.

Before contacting the central protrusion of the cross-section, the end section of the cross-section tube is transformed in an intermediate step into a circular cross-section, for example by 9 mm. If desired, for example, the cylindrical surface of the circular tube section formed in this way can be provided with ring-shaped or spifle-shaped grooves, for example in order to increase the flexibility of this connection. Instead of this circular connection, the cylindrical surface of the connection end can be circumferentially shaped by suitable deformation methods, for example into a nine-shape that is individually suited to the connection to the structure to be connected. This circumferential shape is, for example, a square or a rectangle.

It can be provided in trapezoidal or hexagonal and octagonal shapes.

After the machining process to form the final forged cross-sectional shape, the protrusions of the cross-sectional shape are joined or brazed using the above method, but in this case, it is a process in which the end portions are not deformed.
It is sufficient that the process is performed only partially in the area of the planar shape.

Examples of the present invention will be described in detail with reference to the drawings.

In the drawings, FIGS. 1, 2, and 3 are cross-sectional views of an I#1 square, and two essentially circular tubes; FIGS. 4 and 5 are cross-sectional views of two essentially circular tubes; 6 is a cross-sectional view of an essentially circular tube in which the material accumulation is shaped like a protrusion; FIG. iI/ of an essentially square tube
Figures 'll1I, Figures 7 and 9 are derived from the lightning basic break (3) shape shown in Figure 5. The flow cross-section formed from this pipe basic cross-section, however, the cross-sectional view of the flow cut (8) shape at the intermediate stage when the forming process is interrupted, Figures 8 and 10 are at the terminal deformation. No. 7 shown along with the necessary fress processing
It is a sectional view of the finished molded tomomakura grate of the flow cross-sectional shape of Fig. 9 and Fig. 9. Incidentally, FIG. 9 and FIG. 1O show the state in which the thin plate γ for active flow is attached.

Figures 11 and 13 are shown in relation to the cross-sectional view taken along the line A-A (Figure 11) and the cross-sectional view taken along the line B-B (Figure 13) (Figures 12 and 14). FIG. 3 is a cross-sectional view of the same flow Wr field shape at different positions. A circular connection formed in the flow cross-section is particularly visible in FIGS. 12 and 14.

Figure 15 is a perspective view of the finished cross section of Figure 12;
Figure 1 is a perspective view of a heat exchanger that utilizes nine flow profiles obtained by the method of the present invention; Figures 17, 18, 19, and the additional figures show the process of finishing deformation of the turbine blade profile. Chapter I
The final state shown! Finished with IK twist.

It may also be formed from a basic profile produced by the method of the present invention as shown in FIG.

The method of the present invention will be explained in detail by giving examples.

The method of the invention can be applied, for example, to the square tube 1 shown in the first figure or to the square tube 1 shown in the first
Starting from the essentially circular tube 2 shown.

Thus, in the method of the invention, the tube 1 shown in the first figure is provided with material accumulations 2', 3, which are arranged in particular at the corners, by means of a processing method which will be explained in more detail hereinafter. On the other hand, in the case of the example shown in the second figure, it is possible to start from one having a cylindrical pipe bell; in that case, the material accumulation parts 4, 5
are uniformly distributed along the saw edges, so that the tubes 2 are arranged at the outer periphery uniformly mutually offset from time to time and form a square shape with rounded corners. It is formed to have the shape of

In FIG. 3, the tube 3 is formed into a cylindrical shape on the outside.
On the other hand, in FIG. 5, which shows an embodiment in which the inside of the tube 3 is formed into a composite shape of a square and circular inner wall structure, one of the mutually opposing material accumulation parts 6 is dense and shown in loss hatching. The other mutually opposing material accumulations are illustrated with diagonal hatching.

As shown in the first figure, there is a material accumulation part 2' in the square tube
3, the primary part 3 of the material is deformed by stretching and specific gravity as shown in Figure 6 of the pipe IFi. It is formed in the region of the side unfinished corner, while the other material accumulation 2' is deformed to form a separating projection between the conduits 9, 10 of the flow cross-section to be completed later. As mentioned in the introduction, the arrangement and formation of this separation protrusion is firstly designed to be strong, and rounded to forge important heat transfer properties.As shown in Figure 6, the flow cross-sectional shape 8 is basically deformed in the finish. , a gap is left between the ends of the separating protrusions 2 facing each other, and the gap is compressed, for example, in the shape of a flow plane, and then the gaps between the ends of the separating protrusions 2 are compressed into 11! This completes the bond.

4 and 5 show essentially cylindrical tube sections 11 and 12.
, the round material accumulation part 1 is already formed in a protrusion shape in advance.
It indicates the presence of numbers 3 to 14. In this case, as shown in FIG.
It protrudes not only from the surface but also from the surface of the outer wall Ii. The embodiment shown in the fifth figure differs from the embodiment shown in the fourth figure in that the protruding material accumulation parts 14 and 15 protrude only from the inner wall 18 of the tube section 12. The material accumulation can be formed, for example, by drawing, round hammering, piezoelectric, hot pressing, or extrusion, as well as the tube section with the material accumulation.

The illustrations in FIGS. 4 and 5 can also be used as a basis for other methods for the production of hollow bodies or flow profiles from time to time.

The illustrations in FIGS. 4 and 5g are to be interpreted as showing two successive process steps. That is, the relatively large amount of material required, for example for the later required inner protrusions, i.e. separation protrusions, must first be transformed into material accumulations 13 (FIG. 4) projecting from the outer and inner walls of the tube profile 11. provided by. In a subsequent processing step, this material accumulation 13 is formed into the contour Is (tube cross-section 11 shown in FIG. 5). This is followed by another or final cross-sectional shaping process.

The embodiment shown in FIGS. 7 to 10 starts from a tube-shaped basic body 12 shown in FIG. 5, which has material accumulations 14 and 15 that project only from the inner wall surface.

As shown in Figure 7, is transformed into the Y-completed state. However, the mutually adjacent excitation ends of the material accumulation section 15 do not yet come into contact with each other. For example, in the manufacturing process between the structure shown in S and the structure shown in FIG. By interrupting to insert . After the insertion of the inner working tool, the next deformation process for the production of the cross-section 16 (FIG. 7) takes place. 1 [Thereafter, the inner processing tool is first removed and then a transverse deformation of the cross-section 16 to the final cross-section is carried out by means of taps 19, 20, as shown in FIG.

In that case, the short projecting ends are welded or soldered together before the process of bringing their central ends into contact.

FIG. 9 shows the flow profile 16 obtained from the one shown in FIG. 5 at an intermediate stage of deformation as shown in FIG. In that case, before the final compression process, a turbulent thin film [21] is inserted between the ends of the nine protrusions formed by the material accumulation parts 15 in the intermediate space of the pipe and mutually adjacent ones, as shown in FIG. 1O. The turbulent flow plate simultaneously forms the inner structural part of the flow profile 16' in the final deformation exit shown in Figure 10, and this DC flow plate then finally forms the flow profile between the protrusion contact surfaces! ll! Connected or soldered.

The final finishing deformation of the flow profile is carried out by co-compacting the pipe joint f#i by rolling with a welder and by welding the inner protrusion.

11, 12, 13, and 14 similarly show a flow cross-section 1 made from the tube base 12 shown in FIG. 5, for example.
6 is shown. It can be seen from FIGS. 11 and 13 that the central projecting ends are arranged at a desired distance from each other. That is, as in FIGS. 7 and 9, this cross-sectional shape 16 is not completely deformed. In the case of the embodiments shown in FIGS. 11 to 14, the flow profile 16 before complete deformation and welding or soldering along the protrusion ends.
First, a circular connecting portion 21 is provided using a round hammer. Via this circular connection, the cross section is connected in a suitable manner to the base of the heat exchanger. This connection can of course be secured by other suitable methods (pulling, compression or rolling), in which case it is of course also possible to form this part II@ polygonally. Here, polygon means, among other things, square and rectangle.

It includes a trapezoidal or six or eight-sided pipe connection cross section.

Furthermore, a groove may be further provided in the connecting portion 21' as shown in M15. In that case, after welding or soldering along the remaining protrusion ends, the groove n is connected to the connecting part 2.
1'. As shown in Figure 15, groove n
The grooves can be carved continuously at regular intervals in the shape of a diagonal on the outer wall of the connection s21'. Alternatively, it may be carved in a spiral shape in one direction of the connection part.

FIG. 16 illustrates a heat exchanger suitable for use with a flow profile made by the present invention. This figure shows a cross-countercurrent IJ system. A hollow cross-sectional body 2 forming this matrix, for example, a cross-sectional shape 1 shown in FIG.
6 is connected to the first fixed pipe guide part 5 for supplying compressed air of the box 17, and is connected to the inside of the second fixed pipe guide part 5. M) Heat gas (arrow H) through the IJ gas
) The compressed air U heated by K is sent from the tube guide 6 to a suitable consumer 2, for example a combustion chamber of a gas turbine drive.

As shown in FIG. 16, two mutually separate pipe guides S and 5 are also integrated into a common collecting station. The heat exchanger matrix runs from time to time in a U-shaped projection on one side of the collecting pipe j.

The travel of the corresponding compressed air through the matrix is indicated by arrows. Instead of a common collecting pipe for both pipe guides S and δ, it has two mutually separate, essentially parallel pipes, and one pipe is for the compressed air supply to the matrix, the other The pressure from the IJ to the heat exchanger is m9! The structure of the heat exchanger for air exhaust may be considered.

FIG. 17 shows mutually separated inner conduits 28, 29, made of polygonal tubes. Flow foundation cross section shape 2 with and (capital)
7 is shown. Since the basic cross-sectional shape shown in Figure 17 is used, for example, as a turbine stationary blade or moving blade, this basic cross-sectional shape can be adjusted according to aerodynamic or thermodynamic conditions depending on the desired length of each individual blade. It is then cut to the desired exact shape. Next, as shown in Figure 18 below, the cross-sectional shape
is essentially bent backwards and then the contour 2 shown in FIG. 19
Like the seven forces, it is stretched out to its completed state, mainly in the direction of the hands. S
, the desired true twist is finally formed, as shown in Figure I, with a corresponding cross-sectional contour progression n'''. In that case, forging is carried out as required. As shown, a sheet of corresponding cross-section is forged by a forging die of corresponding shape into the final shape as shown in Figure I.

In order to utilize the flow profile produced by the method of the invention, it is not absolutely necessary to form circular connections in the flow profile in the case of the known heat exchanger example. Rather, it is also conceivable to connect the spatula-shaped nine-flow cross-section directly to the bottom of the heat exchanger and then to fix it there.

[Brief explanation of drawings]

Figures 1, 2, and 3 are square tubes. and sectional views of two essentially circular tubes; FIGS. 4 and 5 are cross-sectional views of essentially circular tubes with protruding material accumulations; FIG. 6 is a cross-sectional view of two essentially circular tubes; FIGS. 7 and 9 are flow cross-sections obtained from the cross-section shown in FIG. Figures 8 and 10 are cross-sectional views of the flow cross-sectional shapes shown in Figures 7 and 9, shown together with the press tools necessary for final deformation, in a finished state, and Figures 11 and 13 are the same at different positions. FIG. 12 is a sectional view taken along the line A-A shown in FIG. 11, and FIG.
The figure is a sectional view taken along the line B-B shown in Fig. 13, and Fig. 15 is a cross-sectional view of the
FIG. 16 is a perspective view of a heat exchanger, and FIGS. 17, 18, 19, and 19 are cross-sectional views showing the process of forming the turbine blade cross-section. 1.2......tube, 2', 3, 4.5...
・・・・・・Material accumulation department, 9, 10・・・・・・・・・
Compressed air guide line, 13, 14° 15...
・Material accumulation section, 17, 18, 17', 18'・
...... Compressed air pipe internal structure, 16...
...Flow cross section, 21...Thin plate,
21′・・・・・・Connection part, n・・・・・・・・・
Groove. Agent Patent Attorney Ishito Former Procedural Amendment Island (Voluntary) 1977 58 XH: l Month 121
11, 'J1 large and small Showa 41i1 ``l 49 ff Ii+'J4
No. 212074 ri2, Title of invention Method for manufacturing hollow flow cross-sectional shape
Patent Attorney Ishi)-j Gen 5 An elephant drawing of Sodeichi's λ. 6. Contents of amendment

Claims (1)

[Scope of Claims] (1) It is hollow and has a flow cross-sectional shape that is aerodynamically optimally formed according to its use, and the first working medium (hot gas) is kept in the outer part during operation. A second working medium (compressed air) is introduced into the flow and the pipe line that exists inside the flow cross section.
In the method of fabricating a flow cross-section through which a) a) a tube having an essentially circular cross-section; Tube with square cross section1. or forming material accumulations 2', 3 or 4, 5 in a tube with a polygonal cross-section at predetermined positions, in particular at uniformly distributed positions around the tube, by a suitable processing method, b ) Then, by pulling or rolling the tube (for example l), one of the material accumulations 3 forms wall reinforcements on the inflow and outflow sides in the end corner areas of the inflow and outflow sides of the flow profile, and Material accumulation part 2' is welded, brazed, etc.)
A method of fabricating a hollow flow profile, characterized in that it is deformed to form a separating projection for at least two mutually separated compressed air guide conduits 9° which can be fixed together in the meridional plane. (2) uniform material accumulations 13 facing each other in at least two tube turns before the forming process to give the cross-sectional shape;
14 or 14 and 15 are carved into protrusions, and the material accumulation parts 14 and 15 are formed in the inner tube wall structure part, and the material accumulation part 13 is formed in the inner tube M structure part and/or the outer tube wall structure part. A method of manufacturing a hollow flow cross-sectional shape as described in item 1 of the scope of the special request, characterized in that the hollow flow cross-sectional shape is formed to protrude more. (3) Pulling the material accumulation part or the pipe cross section that has it,
A method for manufacturing a hollow flow cross-sectional shape according to claims 1 and 2, characterized in that the hollow flow cross-sectional shape is formed by round hammering, rolling, hot pressing, or extrusion. (4) The desired compressed air pipe internal structure 17, 18 or the final compressed air pipe internal structure 1 through the molding process that gives the cross-sectional shape.
Claim 1fj is characterized in that the processing is carried out using a Kunai-Yu machining tool that is compatible with γ, 18'. 2nd Jjj, and a method for manufacturing a hollow flow cross-sectional shape as described in 3rd item. (5) The final molding of the nine flow cross-section shapes 160 is fixed at the opposing central starting end portions, and finally the KR v! Claim 1, characterized in that the forming process is interrupted to give a cross-sectional shape to the rounding into which the turbulently formed sheet or sheet strip 4, which is welded or soldered to the ITWI type, is inserted; A method for manufacturing a hollow flow cross-sectional shape according to items 2 and 3. (6) Final finishing molding to pipe joint #! The rolling action of the welding machine compresses the inner protrusions together and welds them together.
A method for manufacturing a hollow flow cross-section according to one or more of claims 1 to 5, characterized in that the method is carried out. (7) Especially for gas turbine drive equipment.
In a method of manufacturing a stator blade or rotor blade that is cooled from the inside of a machine, the running cross-sectional base body formed by the above method is compressed to a predetermined #IjI shape, and then attached to f11 contact or solder. 1. After completing the stone cutting process, the blade is cut into individual blade cross-section thin plates, and then forged to twist the blade into the shape of the blade, and the JilWfr surface-shaped thin plate is formed into the final shape using a forging die. 1. Claim No. 1
A method of manufacturing a hollow 1-fold cross-sectional shape of 1" or 1" in sections 1 to 6. ' to round Huff q- etc. to make a circle or (% to square, rectangle 2 trapezoids, hexagons or 8
A hollow flow cross-sectional OH construction according to one or more of claims 1 to 6, wherein the polygonal shape (including a square) is shaped like a lock. (9) Before or after bath melting or soldering at least the connecting portion 21' along the remaining protruding end, Iij!
A method for producing a hollow flow cross-section according to claim 8fj, characterized in that the inner wall and/or the outer wall is provided with coaxial grooves or grooves running in a spiral or thread-like manner. (7) In the next processing step, a protrusion-shaped material accumulation s15 protruding from the inner tube wall is formed from the material accumulation portion 13 protruding from the outer and inner walls of the tube 11 located in close proximity to each other. A method for manufacturing a hollow flow cross-sectional shape according to one of claims 1 to 9 or multiple volumes. α-wheel The spatula-shaped hollow cross-section 16 on the one hand is connected to the first (
6) two separate tubes, connected on the one hand to the tube guide 24 and on the other hand to a second fixed tube guide δ which passes the heated and compressed air through the matrix to the consumer; The guides are integrated in a common collecting pipe or are formed by a single pipe running essentially in parallel; Claims 1 to 1 for the production of a single spatula-shaped hollow section for a cross-counterflow matrix of a heat exchanger, running in a U*W direction projecting transversely to a single tube. Use of the manufacturing method described in Section 6 and Section 9 of 8゜.