Plate heat exchanger and method
Patent Information
- Application Number
- EP2023757515
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-08-19
- Filing Date
- 2023-08-11
- Publication Date
- 2025-06-25
AI Technical Summary
The existing plate heat exchanger designs are prone to cracking due to dramatic process changes and resulting temperature fluctuations, which can lead to weld seam cracking under mechanical stress.
A plate heat exchanger design that connects heat exchanger block modules using a positive connection and a weld seam, where the weld seam covers the positive connection, allowing force transmission only through the positive connection to prevent mechanical stress on the weld seam, thereby preventing cracks.
This design enhances the stability of the weld seam by ensuring it is free from mechanical stress, preventing cracks and ensuring reliable operation under varying conditions.
Smart Images
Figure 1.1
Abstract
Description
[0001] Description
[0002] Plate heat exchangers and processes
[0003] The invention relates to a plate heat exchanger and a method for producing such a plate heat exchanger.
[0004] A plate heat exchanger comprises a heat exchanger block constructed from alternating heat exchange elements, particularly so-called fins or heat transfer fins, and separator plates. The heat exchange elements are made of corrugated or ribbed aluminum sheets, whereas the separator plates can be made of smooth aluminum sheets. With the help of the heat exchange elements and the separator plates, the plate heat exchanger forms a multitude of parallel heat transfer passages through which process media can flow and indirectly transfer heat to process media conveyed in adjacent heat transfer passages.
[0005] A heat exchanger block as mentioned above can be composed of several heat exchanger block modules. According to internal experience, these heat exchanger block modules can be connected to each other using a welded joint. This welded joint is unproblematic in terms of cracking during a stable and continuous process. In contrast, the welded joint poses a risk of cracking during a highly variable process and the resulting large temperature fluctuations and temperature gradients. This needs to be improved.
[0006] Against this background, one object of the present invention is to provide an improved plate heat exchanger.
[0007] Accordingly, a plate heat exchanger having a first heat exchanger block module and a second heat exchanger block module is proposed, wherein the first heat exchanger block module and the second heat exchanger block module are connected to one another by means of a positive connection, wherein the first heat exchanger block module and the second heat exchanger block module are connected to one another by means of a weld seam and wherein the weld seam covers the positive connection at least in sections.The first heat exchanger block module has a first cover plate, wherein the second heat exchanger block module has a second cover plate, wherein the first cover plate and the second cover plate are connected to one another by means of the positive connection, wherein the first cover plate and the second cover plate are positively connected to one another by means of a connecting element, wherein the first cover plate has a recess in which the connecting element is received, and wherein the second cover plate has a recess in which the connecting element is received.
[0008] Because the first heat exchanger block module and the second heat exchanger block module are connected to each other both by means of the positive connection and by means of the weld seam, it is possible to design the positive connection in such a way that force transmission between the first heat exchanger block module and the second heat exchanger block module, or vice versa, is transmitted exclusively or almost exclusively by means of the positive connection, so that the weld seam is preferably not subjected to mechanical stress. This reliably prevents cracking in the weld seam.
[0009] The plate heat exchanger is, in particular, a so-called plate fin heat exchanger (PFHE), or can be referred to as such. The plate heat exchanger is constructed from a plurality of alternating heat exchange elements and separating plates. A separating plate is arranged between two heat exchange elements, and a heat exchange element is arranged between two separating plates. The heat exchange elements and the separating plates are thus stacked on top of one another and form a heat exchanger block of the plate heat exchanger. The heat exchange elements are so-called fins, in particular so-called heat transfer fins, or can be referred to as fins.
[0010] The heat exchange elements can be formed as corrugated or ribbed sheets, for example, aluminum sheets. The separating plates are separating plates or can be referred to as separating plates. The separating plates can also be made of aluminum. The heat exchanger block is divided into the first heat exchanger block module and the second heat exchanger block module. Each heat exchanger block module comprises any number of heat exchange elements and separating plates. In principle, the heat exchanger block can have any number of heat exchanger block modules. The number of heat exchange elements and the number of separating plates per heat exchanger block module is arbitrary.
[0011] The plate heat exchanger or the aforementioned heat exchanger block preferably has a cuboid geometry with a width direction or x-direction, a height direction or y-direction, and a depth direction or z-direction. In the height direction, the heat exchanger block preferably has a larger dimension than in the width direction and the depth direction, resulting in an elongated cuboid geometry of the heat exchanger block.
[0012] Heat exchanger block modules also have a similarly elongated, cuboidal geometry. The heat exchange elements and the separating plates can be arranged side by side in the depth direction or stacked vertically. The plate heat exchanger differs from the heat exchanger block in that, in addition to the heat exchanger block, the plate heat exchanger has a plurality of connection devices for supplying and discharging fluids to and from the plate heat exchanger.
[0013] The heat exchange elements are preferably enclosed by edge strips, in particular aluminum edge strips, which are also part of the heat exchanger block. The edge strips are soldered to the separating plates and / or the heat exchange elements. The edge strips can form a frame surrounding the respective heat exchange element. The heat exchanger block can have cover plates that close off the heat exchanger block vertically, both upwards and downwards. The cover plates can be external separating plates. The cover plates can be soldered to the outermost heat exchange elements. Alternatively, separating plates can also be provided between the cover plates and the outermost heat exchange elements. The cover plates preferably differ from the separating plates only in their wall thickness.
[0014] The plate heat exchanger can be part of a process plant. The process plant can be, for example, a plant for air separation, for the production of liquefied natural gas (LNG), a plant used in the petrochemical industry, or the like. The process plant can comprise a plurality of such plate heat exchangers. Accordingly, a process plant with such a plate heat exchanger is also proposed.
[0015] A positive connection is created by the interlocking or engaging of two connecting components, in this case the first heat exchanger block module and the second heat exchanger block module. Accordingly, the first heat exchanger block module engages with the second heat exchanger block module in a positive fit, or vice versa. In particular, two facing cover plates of the heat exchanger block modules are connected to each other in a positive fit. A positive connection can, in principle, be established and released as often as desired.
[0016] The first heat exchanger block module and the second heat exchanger block module can be connected to one another directly or indirectly in a form-fitting manner. In the case of a direct form-fitting connection between the first heat exchanger block module and the second heat exchanger block module, the first heat exchanger block module and the second heat exchanger block module directly engage one another in a form-fitting manner. In the case of an indirect form-fitting connection between the first heat exchanger block module and the second heat exchanger block module, a connecting element is provided, by means of which the first heat exchanger block module is connected to the second heat exchanger block module in a form-fitting manner.
[0017] The weld seam is preferably applied to the positive connection. The weld seam can be completely covered by the weld seam. The weld seam is preferably load-free or force-free. In this case, "covering" or "concealing" the positive connection means, in particular, that the weld seam is routed over the positive connection. When viewed from the direction of the positive connection, the weld seam can cover or conceal the positive connection, so that the positive connection is not directly visible.
[0018] The first heat exchanger block module has a first cover plate, wherein the second heat exchanger block module has a second cover plate, and wherein the first cover plate and the second cover plate are connected to one another by means of the positive connection.
[0019] As previously mentioned, each heat exchanger block module has two cover plates, between which an active area comprising a plurality of alternately arranged heat exchange elements and separating plates is provided. The first cover plate of the first heat exchanger block module and the second cover plate of the second heat exchanger block module can directly engage with each other in a form-fitting manner. Alternatively, the first cover plate of the first heat exchanger block module and the second cover plate of the second heat exchanger block module can be connected to each other in a form-fitting manner using an additional connecting element or a plurality of such connecting elements.
[0020] According to one embodiment, the first cover plate and / or the second cover plate each have a thickness of 8 to 18 mm, preferably of 10 to 16 mm, more preferably of 12 to 14 mm.
[0021] In particular, the cover plates have a thickness of at least 12 mm. The cover plates can be multi-layered. "Multi-layered" in this context means, in particular, that the cover plates can have several layers. These layers can, for example, be soldered and / or welded together.
[0022] According to a further embodiment, the first cover plate and the second cover plate are connected to each other by means of the weld seam.
[0023] In particular, the first heat exchanger block module rests with its first cover plate on the second cover plate of the second heat exchanger block module, or vice versa. Preferably, the weld seam extends completely around the first cover plate and the second cover plate.
[0024] The first cover plate and the second cover plate are positively connected to each other by means of a connecting element.
[0025] In this case, the first cover plate and the second cover plate are indirectly or indirectly connected to one another with the aid of the connecting element. This means, in particular, that the first cover plate is positively connected to the connecting element and that the connecting element is positively connected to the second cover plate. The number of connecting elements is fundamentally arbitrary. Preferably, at least in areas of the heat exchanger block or the heat exchanger block modules where maximum stresses can occur, such connecting elements are provided. With the aid of the connecting element or connecting elements, force can be transmitted from the first cover plate to the second cover plate or vice versa. The connecting element can, for example, be plate-shaped. The connecting element can also have a double-T-shaped or a bone-shaped cross-section.
[0026] According to a further embodiment, the recess in the first cover plate extends into the first cover plate, starting from a surface of the first cover plate facing the second cover plate. Alternatively or additionally, the recess in the second cover plate extends into the second cover plate, starting from a surface of the second cover plate facing the first cover plate.
[0027] The surface of the first cover plate can be referred to as the first surface. The surface of the second cover plate can be referred to as the second surface. The recesses of the first cover plate are machined into the first surface. This means in particular that the recesses of the first cover plate are located below the first surface. The recesses of the first cover plate extend from the first surface into the first cover plate. The recesses of the first cover plate are thus arranged within the first cover plate. The first surface and the second surface in particular face one another. In particular, the first cover plate and the second cover plate abut one another at their two surfaces. The recesses of the second cover plate are machined into the second surface. This means in particular that the recesses of the second cover plate are located below the second surface.The recesses of the second cover plate extend from the second surface into the second cover plate. The recesses of the second cover plate are thus arranged within the second cover plate. The first cover plate has a recess in which the connecting element is received, and the second cover plate has a recess in which the connecting element is received.
[0028] The recesses can be milled recesses, for example. Preferably, several recesses are provided on the first cover plate. Accordingly, several recesses are also provided on the second cover plate. To connect the two heat exchanger block modules, the first cover plate and the second cover plate are aligned such that the recess in the first cover plate and the recess in the second cover plate are positioned one above the other.
[0029] According to a further embodiment, a plurality of connecting elements are provided, wherein the connecting elements have different thicknesses.
[0030] Alternatively, the connecting elements can also have identical thicknesses. The number of connecting elements is optional.
[0031] According to a further embodiment, the connecting element is pinned to the first cover plate and to the second cover plate by means of pins.
[0032] For this purpose, holes are drilled into the first cover plate, the second cover plate, and the connecting element, into which the pins can be pressed or driven. The holes can have a conical or tapered geometry. Accordingly, the pins can also have a conical or tapered geometry. The pins can be made of stainless steel, for example.
[0033] According to a further embodiment, the weld covers the pins.
[0034] In particular, the holes in which the pins are housed are welded or welded over using the weld seam. This reliably prevents moisture from penetrating the holes in the cover plates.
[0035] According to a further embodiment, the pins are conical. Accordingly, the holes in which the pins are received can also be conical. For this purpose, the holes can be drilled into the cover plates of the two heat exchanger block modules using a conical or tapered drill. The pins can, for example, have a taper of 1°.
[0036] According to a further embodiment, the recess of the first cover plate is machined into the first cover plate using a separating manufacturing process and / or a forming manufacturing process. Alternatively or additionally, the recess of the second cover plate is machined into the second cover plate using a separating manufacturing process and / or a forming manufacturing process.
[0037] In separating manufacturing processes, material is removed. In forming manufacturing processes, material is deformed. Separating manufacturing processes primarily involve removing manufacturing processes, such as milling or eroding. Forming manufacturing processes, for example, include indentation, rolling, or forging.
[0038] According to a further embodiment, the first cover plate has hook sections, wherein the second cover plate has hooking sections corresponding to the hook sections, and wherein the hook sections engage positively in the hooking sections.
[0039] The hook sections preferably extend from the first cover plate toward the second cover plate. The hook sections can be inserted laterally into the hook sections or hooked into the hook sections from above. To firmly connect the first heat exchanger block module to the second heat exchanger block module, wedge elements can be pressed or driven into the hook sections, which wedge the hook sections into the hook sections. The wedge elements are strip-shaped. The wedge elements have a wedge shape.
[0040] According to a further embodiment, the first cover plate has a
[0041] engagement portion in which the connecting element engages in a form-fitting manner, wherein the second cover plate has an engagement portion in which the connecting element engages in a form-fitting manner.
[0042] The engagement portion of the first cover plate and the engagement portion of the second cover plate can, for example, be milled recesses that are introduced into the respective cover plate. The engagement portion of the first cover plate and the engagement portion of the second cover plate each have a T-shaped geometry. Accordingly, the connecting element has a double-T-shaped cross-section or a bone-shaped cross-section. To connect the two heat exchanger block modules to one another, the engagement portion of the first cover plate and the engagement portion of the second cover plate are aligned with one another such that they are placed on top of one another. The connecting element is then simultaneously pressed or hammered into the two engagement portions of the two cover plates.
[0043] According to a further embodiment, the connecting element is conical.
[0044] This means, in particular, that the connecting element tapers from a first end section toward a second end section. At the same time, however, the connecting element has the aforementioned double-T-shaped or bone-shaped cross-sectional geometry.
[0045] Furthermore, a method for producing such a plate heat exchanger is proposed. The method comprises the following steps: a) providing a first heat exchanger block module and a second heat exchanger block module, b) connecting the first heat exchanger block module and the second heat exchanger block module to one another using a positive connection, and c) connecting the first heat exchanger block module and the second heat exchanger block module to one another using a weld seam, such that the positive connection is at least partially covered by the weld seam.In step a), a first cover plate of the first heat exchanger block module and a second cover plate of the second heat exchanger block module are positively connected to one another by means of a connecting element, wherein in step a) a recess in which the connecting element is received is provided on the first cover plate, and wherein a recess in which the connecting element is received is provided on the second cover plate.
[0046] Providing the first heat exchanger block module and the second heat exchanger block module in step a) may comprise manufacturing the first heat exchanger block module and / or the second heat exchanger block module, in particular soldering heat exchange elements, separating plates, and cover plates. Furthermore, providing the heat exchanger block modules may also include introducing engagement portions and / or recesses into the cover plates. Preferably, the weld seam is applied after the first heat exchanger block module and the second heat exchanger block module have been positively connected to one another. In particular, the weld seam may be routed over the positive connection. The weld seam is preferably stress-free or stress-free.
[0047] In step b), a first cover plate of the first heat exchanger block module and a second cover plate of the second heat exchanger block module are positively connected to one another by means of a connecting element.
[0048] In particular, the connecting element is first positively connected to the first cover plate of the first heat exchanger block module. The connecting element is then positively connected to the second cover plate of the second heat exchanger block module. This means that the positive connection between the first heat exchanger block module and the second heat exchanger block module is achieved with the aid of the connecting element.
[0049] In step a), a recess in which the connecting element is received is provided on the first cover plate, wherein a recess in which the connecting element is received is provided on the second cover plate.
[0050] The recesses can be provided as milled recesses on the first cover plate and the second cover plate. Alternatively, the recesses can also be created by an eroding process or the like. According to a further embodiment, in step b), bores are made in the first cover plate, the second cover plate, and the connecting element, wherein the first cover plate, the second cover plate, and the connecting element are pinned together by means of pins inserted into the bores.
[0051] Preferably, the connecting element is first inserted into one of the recesses in the first cover plate, and the holes are drilled into the first cover plate and the connecting element. A conical drill can be used for this purpose. The pins are then pressed or driven in to connect the connecting element to the first cover plate. The second heat exchanger block module with the second cover plate is then lowered onto the first cover plate so that the connecting element is received in one of the recesses in the second cover plate. The second cover plate and the connecting element are then provided with holes into which pins are also inserted. The pins are then welded shut using the weld seam.
[0052] According to a further embodiment, the recess of the first cover plate is machined into the first cover plate using a separating manufacturing process and / or a forming manufacturing process. Alternatively or additionally, the recess of the second cover plate is machined into the second cover plate using a separating manufacturing process and / or a forming manufacturing process.
[0053] The embodiments and explanations explained for the plate heat exchanger apply accordingly to the process and vice versa.
[0054] "One" in this case is not necessarily to be understood as limiting the number to exactly one element. Rather, multiple elements, such as two, three, or more, can also be provided. Any other numbering term used here should also not be understood as implying a limitation to the exact number of elements stated. Rather, numerical deviations upwards and downwards are possible, unless otherwise stated. Further possible implementations of the plate heat exchanger and / or the method also include combinations of features or embodiments described previously or below with regard to the exemplary embodiments that were not explicitly mentioned. In this case, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the plate heat exchanger and / or the method.
[0055] Further advantageous embodiments and aspects of the plate heat exchanger and / or the method are the subject of the dependent claims and the exemplary embodiments of the plate heat exchanger and / or the method described below. The plate heat exchanger and / or the method are explained in more detail below using preferred embodiments with reference to the accompanying figures.
[0056] Fig. 1 shows a schematic perspective view of an embodiment of a plate heat exchanger;
[0057] Fig. 2 shows a schematic perspective view of an embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1;
[0058] Fig. 3 shows a schematic side view of another embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1;
[0059] Fig. 4 shows a schematic sectional view of the heat exchanger block according to the section line IV-IV of Fig. 3;
[0060] Fig. 5 shows the detailed view V according to Fig. 3;
[0061] Fig. 6 shows a schematic perspective view of the plate heat exchanger according to Fig. 3;
[0062] Fig. 7 shows a further schematic perspective view of the plate heat exchanger according to Fig. 3; Fig. 8 shows a schematic perspective view of another embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1;
[0063] Fig. 9 shows a further schematic perspective view of the plate heat exchanger according to Fig. 8;
[0064] Fig. 10 shows a schematic perspective view of another embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1;
[0065] Fig. 11 shows a further schematic perspective view of the heat exchanger block according to Fig. 10;
[0066] Fig. 12 shows a schematic detailed view of another embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1;
[0067] Fig. 13 shows a schematic plan view of an embodiment of a cover plate for the heat exchanger block according to Fig. 12;
[0068] Fig. 14 shows a schematic plan view of another embodiment of a cover plate for the heat exchanger block according to Fig. 12;
[0069] Fig. 15 shows a further schematic detailed view of the heat exchanger block according to Fig. 12;
[0070] Fig. 16 shows a schematic exploded view of the heat exchanger block according to Fig. 12;
[0071] Fig. 17 shows a schematic exploded detailed view of another embodiment of a heat exchanger block for the plate heat exchanger according to Fig. 1; and
[0072] Fig. 18 shows a schematic block diagram of an embodiment of a method for manufacturing the plate heat exchanger according to Fig. 1. In the figures, identical or functionally identical elements have been provided with the same reference numerals unless otherwise stated.
[0073] Fig. 1 shows a schematic perspective view of an embodiment of a plate heat exchanger or plate heat exchanger 1. Fig. 2 shows a schematic perspective view of an embodiment of a heat exchanger block 2 for the plate heat exchanger 1 according to Fig. 1. In the following, reference is made simultaneously to Figs. 1 and 2.
[0074] With the help of the plate heat exchanger 1 shown in Fig. 1, heat exchange between several different fluids A to E can be realized. The fluids A to E can also be referred to as process media or media. The plate heat exchanger 1 is, in particular, a plate fin heat exchanger (PFHE) or can be referred to as such. The plate heat exchanger 1 is preferably constructed from components made of aluminum that are soldered, in particular brazed, to one another. The plate heat exchanger 1 can therefore also be referred to as a brazed aluminum plate fin heat exchanger.
[0075] The heat exchanger block 2 is cuboid-shaped or block-shaped and comprises a plurality of passages or heat exchange elements 3 as well as a plurality of separating plates 4. The heat exchange elements 3 are so-called fins, in particular so-called heat transfer fins, or can be referred to as fins. The heat exchange elements 3 can be designed as corrugated or ribbed sheets, for example, as aluminum sheets. The separating plates 4 are separating plates or can be referred to as separating plates. The separating plates 4 can also be made of aluminum. The number of heat exchange elements 3 and the number of separating plates 4 is arbitrary.
[0076] The heat exchanger block 2 is assigned a coordinate system with a first spatial direction or width direction x, a second spatial direction or height direction y, and a third spatial direction or depth direction z. The directions x, y, and z are oriented perpendicular to each other. The width direction x can also be referred to as the x-direction of the heat exchanger block 2. The height direction y can also be referred to as the y-direction of the heat exchanger block 2. The depth direction z can also be referred to as the z-direction of the heat exchanger block 2.
[0077] The heat exchange elements 3 and the separating plates 4 are arranged alternately. This means that a separating plate 4 is positioned between each two heat exchange elements 3, and a heat exchange element 3 is positioned between each two separating plates 4. The heat exchange elements 3 and the separating plates 4 can be connected to one another by a material bond. In material bonded connections, the connecting partners are held together by atomic or molecular forces. Material bonded connections are non-detachable connections that can only be separated from one another by destroying the connecting means and / or the connecting partners. In particular, the heat exchange elements 3 and the separating plates 4 can be soldered to one another, in particular brazed.
[0078] The heat exchanger block 2 further comprises cover plates 5, 6, between which the plurality of heat exchange elements 3 and the plurality of separating plates 4 are arranged. In particular, a first cover plate 5 and a second cover plate 6 are provided. The cover plates 5, 6 can be constructed identically to the separating plates 4. The cover plates 5, 6 can have a thickness of, for example, 5 mm. Preferably, the cover plates 5, 6 do not have any solder plating. The separating plates 4 preferably have a thickness of 1 to 2 mm. In particular, the cover plates 5, 6 have solder plating on both sides. The cover plates 5, 6 are positioned on the outside on a respective outermost heat exchange element 3 and close off the heat exchanger block 2 to the front and rear in the orientation of Figs. 1 and 2.
[0079] Furthermore, the heat exchanger block 2 comprises so-called sidebars or edge strips 7, 8, which laterally delimit the heat exchange elements 3. The edge strips 7, 8 can be integrally connected to the separating plates 4 and / or the heat exchange elements 3, for example, by soldering, in particular by brazing. The aforementioned components of the heat exchanger block 2 are made, for example, of the material 3003 (AIMnICu).
[0080] With the help of the heat exchange elements 3 and the separating plates 4, the
[0081] Plate heat exchanger 1 comprises a plurality of parallel heat transfer passages in which the fluids A to E can flow and indirectly transfer heat to fluids A to E conducted in adjacent heat transfer passages.
[0082] The individual heat transfer passages can be supplied with a respective fluid A to E using connection devices 9 to 18, or the respective fluid A to E can be led away from the plate heat exchanger 1 using such a connection device 9 to 18. The connection devices 9 to 18 are so-called headers or can be referred to as such. Depending on their function, the connection devices 9 to 18 can also be referred to as distributors or collectors.
[0083] For example, the connection devices 11, 13, 15 are suitable for supplying the fluids A, B, D to the plate heat exchanger 1, and the connection devices 9, 10, 12, 14 are suitable for removing the fluids A, C, D, E from the plate heat exchanger 1. Each connection device 9 to 18 is assigned a connection piece 19 to 25, with the aid of which the respective connection device 9 to 18 can be supplied with the corresponding fluid A to E or the corresponding fluid A to E can be removed from the connection device 9 to 18.
[0084] The connecting devices 9 to 18 are integrally connected to the heat exchanger block 2. In particular, the connecting devices 9 to 18 are welded to the heat exchanger block 2. The connecting devices 9 to 18 can also be soldered, in particular brazed, to the heat exchanger block 2.
[0085] The heat exchanger block 2 comprises several, in particular six, surfaces or outer surfaces 26, of which only one is provided with a reference symbol in Fig. 2. For example, the connection devices 9 to 18 are each welded to one of the outer surfaces 26. For example, the connection devices 9 to 11 can be provided on the outer surface 26 provided with a reference symbol in Fig. 2.
[0086] The plate heat exchanger 1 can be part of a process plant 27.
[0087] The process plant 27 can be, for example, a plant for air separation, for the production of liquefied natural gas (LNG), a plant used in the petrochemical industry, or the like. The process plant 27 can comprise a plurality of such plate heat exchangers 1.
[0088] Fig. 3 shows a schematic side view of an embodiment of a heat exchanger block 2A. Fig. 4 shows a schematic sectional view of the heat exchanger block 2A according to the section line IV-IV of Fig. 3. In the following, reference is made simultaneously to Figs. 3 and 4.
[0089] The heat exchanger block 2A comprises a plurality of heat exchanger block modules 28, 29. The number of heat exchanger block modules 28, 29 is fundamentally arbitrary. In particular, however, a first heat exchanger block module 28 and a second heat exchanger block module 29 are provided. For example, the heat exchanger block modules 28, 29 are stacked one above the other, viewed along the depth direction z.
[0090] Each heat exchanger block module 28, 29 comprises two cover plates 5, 6 as previously mentioned, between which an active region S is arranged with several alternately arranged heat exchange elements 3 and separating plates 4. "Active" in this context means in particular that the active region S can be flowed through by the fluids A to E for heat exchange during operation of the plate heat exchanger 1.
[0091] The heat exchanger block modules 28, 29 are connected to each other at facing cover plates 5, 6. For this purpose, a positive connection is provided, which will be explained in more detail below. A positive connection is created by the interlocking or engaging of two connecting partners. Positive connections can generally be released and restored as often as required. The positive connection between the heat exchanger block modules 28, 29 serves to transmit force from the first heat exchanger block module 28 to the second heat exchanger block module 29 and vice versa.
[0092] In addition, the cover plates 5, 6 of the two heat exchanger block modules 28, 29 are also welded together. For this purpose, a weld seam 30 extending along the second spatial direction y is provided. The weld seam 30 can completely surround the heat exchanger block 2A. However, the weld seam 30 preferably does not serve to transmit force between the two heat exchanger block modules 28, 29, but rather merely to provide a fluid-tight seal between the heat exchanger block modules 28, 29. "Fluid-tight" can mean both gas-tight and liquid-tight. The weld seam 30 is covered at least in sections by one of the connection devices 9 to 18. The fluid-tight seal using the weld seam 30 is particularly necessary in the area of the connection devices 9 to 18.
[0093] Fig. 5 shows the detailed view V according to Fig. 3. Fig. 6 shows a further schematic perspective view of the heat exchanger block 2A. Fig. 7 shows a further schematic perspective view of the heat exchanger block 2A. Reference is made below to Figs. 5 to 7 simultaneously.
[0094] In particular, only the two facing cover plates 5, 6 of the two heat exchanger block modules 28, 29 are shown in Fig. 5. The cover plates 5, 6 abut one another and are positively connected to one another. Thus, the heat exchanger block modules 28, 29 are positively connected to one another via their cover plates 5, 6.
[0095] For the form-fitting connection of the two cover plates 5, 6, the first cover plate 5 of the first heat exchanger block module 28 has hook sections 31, 32. The number of hook sections 31, 32 is fundamentally arbitrary. Preferably, a plurality of such hook sections 31, 32 are provided, which are placed at equal distances from one another along the second spatial direction y. The hook sections 31, 32 extend, viewed along the first spatial direction x, over the entire width of the first heat exchanger block module 28. The hook sections 31, 32 are conical, viewed along the width of the first heat exchanger block module 28.
[0096] The second cover plate 6 of the second heat exchanger block module 29 has hooking sections 33, 34 corresponding to the hook sections 31, 32, into which the hook sections 31, 32 can engage in order to positively connect the heat exchanger block modules 28, 29 to one another. The hooking sections 33, 34 are designed as milled recesses or grooves introduced into the second cover plate 6 of the second heat exchanger block module 29. The hook sections 31, 32 can be inserted laterally into the hooking sections 33, 34 along the first spatial direction x. Alternatively, the hook sections 31, 32 can also be threaded into the hooking sections 33, 34 from the front along the third spatial direction z. The hooking sections 33, 34 are conical when viewed along a width of the second heat exchanger block module 29.
[0097] A strip-shaped wedge element 35, 36 (hatched) is provided between each hook section 31, 32 and each hook section 33, 34. Each pair of hook sections 31, 32 and each hook section 33, 34 is assigned a pair of such wedge elements 35, 36. The wedge elements 35, 36 are received in the hook sections 33, 34. The wedge elements 35, 36 wedge or clamp the hook sections 31, 32 in the hook sections 33, 34 with the aid of the wedge elements 35, 36.
[0098] The wedge elements 35, 36 are wedge-shaped and taper from the outer surfaces 26 toward a center of the heat exchanger block 2A. Two wedge elements 35, 36 are accommodated in each hooking section 33, 34, which are driven into the hooking sections 33, 34 from opposite sides of the heat exchanger block 2A.
[0099] The heat exchanger block modules 28, 29 are connected as follows. First, the two cover plates 5, 6 of the heat exchanger block modules 28, 29 are positioned relative to one another. The heat exchanger block modules 28, 29 are hooked into one another. For this purpose, the hook sections 31, 32 are hooked or threaded into the hooking sections 33, 34. The heat exchanger block modules 28, 29 are locked together with the aid of the wedge elements 35, 36, which are driven into the hooking sections 33, 34 from two sides of the heat exchanger block 2A along the first spatial direction x and counter to the first spatial direction x. The weld seam 30 is then produced, which covers the hook sections 31, 32, the hooking sections 33, 34, and the wedge elements 35, 36.
[0100] Fig. 8 shows a schematic perspective view of a further embodiment of a heat exchanger block 2B. Fig. 9 shows a further schematic perspective view of the heat exchanger block 2B. Reference is made to Figs. 8 and 9 simultaneously below. In this embodiment of the heat exchanger block 2B, two heat exchanger block modules 28, 29 with cover plates 5, 6 on both sides are also provided. On the first cover plate 5 of the first heat exchanger block module 28, strip-shaped engagement sections 37, 38 are provided, of which only two are provided with a reference numeral in Fig. 8. On the second cover plate 6 of the second heat exchanger block module 29, strip-shaped counter-engagement sections 39, 40 corresponding to the engagement sections 37, 38 are provided.The engagement sections 37, 38 and the counter-engagement sections 39, 40 engage with each other in such a way that a counter-engagement section 39, 40 is arranged between two engagement sections 37, 38 and vice versa.
[0101] The engagement sections 37, 38 and the counter-engagement sections 39, 40 each have a plurality of bores 41, 42, only two of which are provided with a reference numeral. The bores 41, 42 accommodate bolts or pins 43, 44, which are inserted into the bores 41, 42 from two sides of the heat exchanger block 2B. The heat exchanger block modules 28, 29 are thus positively connected to one another by means of the pins 43, 44.
[0102] To connect the heat exchanger block modules 28, 29, the engagement sections 37, 38 and the counter-engagement sections 39, 40 are first formed onto their cover plates 5, 6. This can be done, for example, using a milling process. The cover plates 5, 6 are aligned with each other so that the holes 41, 42 are aligned. The cover plates 5, 6 are then locked together using pins 43, 44. A press fit can be achieved by prior cooling of the pins 43, 44. Subsequently, a weld seam 30, as previously mentioned, can be welded over the pins 43, 44.
[0103] Fig. 10 shows a schematic perspective view of another embodiment of a heat exchanger block 2C. Fig. 11 shows another schematic perspective view of the heat exchanger block 2C. Reference is made to Figs. 10 and 11 simultaneously.
[0104] The heat exchanger block 20 comprises, as previously mentioned, heat exchanger block modules
[0105] 28, 29, of which only the first cover plate 5 of the first heat exchanger block module 28 and the second cover plate 6 of the second heat exchanger block module 29 are shown in Figs. 9 and 10. Each cover plate 5, 6 has an engagement portion 45, 46. In particular, a first engagement portion 45 is provided on the first cover plate 5 of the first heat exchanger block module 28, and a second engagement portion 46 is provided on the second cover plate 6 of the second heat exchanger block module 29.
[0106] The first engagement section 45 has a T-shaped geometry. Accordingly, the second engagement section 46 also has a T-shaped geometry. The two engagement sections 45, 46 together form a double-T shape. The engagement sections 45, 46 can be grooves milled into the cover plates 5, 6. The engagement sections 45, 46 extend through the entire heat exchanger block 2. The engagement sections 45, 46 can be machined to a depth of 80 mm using a suitable milling tool. The engagement sections 45, 46 can taper in a wedge shape. The engagement sections 45, 46 can also extend only partially into the heat exchanger block 2 in the manner of a blind hole. Any number of engagement sections 45, 46 can be provided, arranged at equal distances from one another.
[0107] A connecting element 47 is received in the engagement sections 45, 46. The connecting element 47 has a double-T-shaped or bone-shaped cross-section. The connecting element 47 simultaneously engages the engagement sections 45, 46 to positively connect the cover plates 5, 6 of the heat exchanger block modules 28, 29. The number of connecting elements 47 is arbitrary. The connecting element 47 can be conical or tapered, at least in sections.
[0108] To connect the heat exchanger block modules 28, 29 to one another, engagement sections 45, 46 are first introduced into the cover plates 5, 6 of the heat exchanger block modules 28, 29. This can be done using a milling process. The engagement sections 45, 46 can also be manufactured using an erosion process or using a diamond-coated shaped file. Subsequently, the cover plates 5, 6 are aligned with one another and the connecting elements 47 are hammered or pressed into the engagement sections 45, 46. The connecting elements 47 are then welded over and thus covered by the weld seam 30 (not shown). A plurality of such engagement sections 45, 46 are provided within the heat exchanger block 20. Therefore, it is also possible to place the heat exchanger block modules 28, 29 on top of one another and then
[0109] To manufacture engagement sections 45, 46.
[0110] Fig. 12 shows a schematic view of another embodiment of a heat exchanger block 2D. Fig. 13 shows a schematic plan view of an embodiment of a first cover plate 5 as mentioned above. Fig. 14 shows a schematic plan view of an embodiment of a second cover plate 6 as mentioned above. Fig. 15 shows another schematic view of the heat exchanger block 2D. Fig. 16 shows a schematic exploded view of the heat exchanger block 2D. In the following, reference is made simultaneously to Figs. 12 to 16.
[0111] The heat exchanger block 2D comprises, as previously mentioned, heat exchanger block modules 28, 29 with mutually facing cover plates 5, 6. In Figs. 12 to 16, only the two cover plates 5, 6 are shown. The cover plates 5, 6 can have a thickness d5, d6 of, for example, 5 mm. Preferably, however, the first cover plate 5 and / or the second cover plate 6 each have a thickness d5, d6 of 8 to 18 mm, preferably of 10 to 16 mm, more preferably of 12 to 14 mm. In particular, the cover plates 5, 6 have a thickness d5, d6 of at least 12 mm.
[0112] Each cover plate 5, 6 comprises several grooves or recesses 48 to 53. Recesses 48 to 50 are assigned to the first cover plate 5, and recesses 51 to 53 are assigned to the second cover plate 6. Recesses 48 to 53 can be rectangular grooves milled into the respective cover plate 5, 6. The number of recesses 48 to 53 is arbitrary. In particular, the cover plates 5, 6 are aligned such that recesses 48 to 50 and recesses 51 to 53 are aligned.
[0113] The recesses 48 to 50 of the first cover plate 5 are connected to one another by means of bores 54 to 56 oriented perpendicular to the recesses 48 to 50. The number of bores 54 to 56 is arbitrary. The bores 54 to 56 are arranged at equal distances from one another. The bores 54 to 56 are conical. The recesses 51 to 53 of the second cover plate 6 are connected to one another by means of bores 57 to 59 oriented perpendicular to the recesses 51 to 53. The number of bores 57 to 59 is arbitrary. The bores 57 to 59 are arranged at equal distances from one another. The bores 57 to 59 are also conical.
[0114] Connecting elements 60 are accommodated in the recesses 48 to 53. The connecting elements 60 extend from the recesses 48 to 50 of the first cover plate 5 into the recesses 51 to 53 of the second cover plate 6. The number of connecting elements 60 is arbitrary. Each connecting element 60 comprises openings or bores 61 to 63. The bores 61 to 63 and the bores 57 to 59 are aligned. Bolts or pins 64 to 66 are accommodated in the bores 57 to 59 and 61 to 63. The pins 64 to 66 are conical.
[0115] Each connecting element 60 has a thickness d60. The connecting elements 60 can all have the same thickness d60. Alternatively, the connecting elements 60 can also have different thicknesses d60.
[0116] The two heat exchanger block modules 28, 29 are connected by first milling recesses 48 to 53 into the opposing cover plates 5, 6 of the heat exchanger block modules 28, 29 in the area of the weld seam 30 using a template or a CNC machine (Computerized Numerical Control, CNC). The connecting elements 60 are then received in the recesses 48 to 50 of the first cover plate 5 of the first heat exchanger block module 28.
[0117] The second heat exchanger block module 29 is aligned with its second cover plate 6 to the first heat exchanger block module 28 in such a way that the connecting elements 60 are received in the recesses 51 to 53 of the second cover plate 6 of the second heat exchanger block module 29 when the second heat exchanger block module 29 is lowered.
[0118] After stacking the heat exchanger block modules 28, 29, with the connecting elements 60 accommodated in the recesses 51 to 53, the holes 54 to 59, 61 to 63 are drilled through the cover plates 5, 6 and the connecting elements 60 using a conical drill (1:50 or 1:100). The conical pins 64 to 66 are driven into the holes 54 to 59, 61 to 63, respectively. The holes 54 to 59 are welded shut, and then the weld seam 30 is created between the heat exchanger block modules 28, 29.
[0119] Fig. 17 shows a schematic exploded detailed view of another embodiment of a heat exchanger block 2E.
[0120] The heat exchanger block 2E is essentially structurally identical to that of the heat exchanger block 2D. The heat exchanger block 2E comprises two heat exchanger block modules 28, 29. The first cover plate 5 of the first heat exchanger block module 28 comprises a plurality of recesses 48 to 50, as previously explained with reference to Figs. 12 to 16. Accordingly, the second heat exchanger block module 29 has corresponding recesses 51 to 53 on its second cover plate 6.
[0121] Perpendicular to the recesses 48 to 50, a bore 67, 68 is made in the respective cover plate 5, 6, which connects all recesses 48 to 50 or the recesses 51 to 53 with each other. A rotatable shaft 69 (hatched) is passed through the bore 67. The shaft 69 is rotatable in the bore 67. A connecting element 70 is connected to the shaft 69 in a rotationally fixed manner. The connecting element 70 has two bores 71, 72. The shaft 69 is received in the bore 71 in a rotationally fixed manner. For example, the connecting element 70 is pinned to the shaft 69.
[0122] The connecting element 70 is rotatable together with the shaft 69 and can be moved from an extended state (solid lines) to a folded state (dashed lines). In the folded state, the connecting element 70 is provided with the reference symbol 70'. The same applies to the bore 72, which in the folded state is provided with the reference symbol 72'. In the unfolded state, the connecting element 70 protrudes beyond the first cover plate 5. In the folded state, the connecting element 70 is completely received within the respective recess 48 to 50. The movement of the connecting element 70 from the unfolded state to the folded state and vice versa is indicated by a double arrow 73. The assembly of the heat exchanger block 2E is carried out as explained below. First, the recesses 48 to 53 are made in the cover plates 5, 6.
[0123] Subsequently, holes 67, 68 are provided on both cover plates 5, 6. The connecting elements 70 and the shafts 69 are then mounted on the first cover plate 5 of the first heat exchanger block module 28. All connecting elements 70 are folded into the retracted position.
[0124] The second heat exchanger block module 29 is placed on the first heat exchanger block module 28 such that the recesses 48 to 50 of the first cover plate 5 and the recesses 51 to 53 of the second cover plate 6 lie one above the other. By rotating the respective shaft 69, the connecting elements 70 are moved from the folded state to the unfolded state. The connecting elements 70 fold into the recesses 51 to 53 of the second cover plate 6 of the second heat exchanger block module 29. A further shaft 69 is pushed through the bores 68, 72, thus connecting the first heat exchanger block module 28 to the second heat exchanger block module 29. The bores 67, 68 are then welded tight, and the weld seam 30 is applied.
[0125] Returning now to Figs. 12 to 16, the first cover plate 5 has a first surface 74. The recesses 48 to 50 are machined into the first surface 74. This means, in particular, that the recesses 48 to 50 are located below the first surface 74. The recesses 48 to 50 extend from the first surface 74 into the first cover plate 5.
[0126] The second cover plate 6 has a second surface 75. The first surface 74 and the second surface 75 face each other. In particular, the first cover plate 5 and the second cover plate 6 abut each other at their two surfaces 74, 75. The recesses 51 to 53 are machined into the second surface 75. This means, in particular, that the recesses 51 to 53 are located below the second surface 75. The recesses 51 to 53 extend from the second surface 75 into the second cover plate 6. The same applies to the heat exchanger block 2E according to Fig. 17.
[0127] The recesses 48 to 50 are introduced or machined into the first cover plate 5, in particular into the first surface 74, using a separating manufacturing process and / or a forming manufacturing process. Accordingly, the recesses 51 to 53 are also introduced or machined into the second cover plate 6, in particular into the second surface 75, using a separating manufacturing process and / or a forming manufacturing process. Material is removed during separating manufacturing processes. Material is deformed during forming manufacturing processes. Separating manufacturing processes particularly include removing manufacturing processes, such as milling or eroding. Forming manufacturing processes, for example, include pressing, rolling, or forging. The same applies to the heat exchanger block 2E according to Fig. 17.
[0128] Fig. 18 shows a schematic block diagram of an embodiment of a method for manufacturing the plate heat exchanger 1.
[0129] The method is particularly suitable for producing the heat exchanger block 2A, 2B, 2C, 2D, 2E. In the method, the first heat exchanger block module 28 and the second heat exchanger block module 29 are provided in a step S1. Providing may include producing the heat exchanger block modules 28, 29, in particular soldering the heat exchange elements 3 and the separating plates 4.
[0130] In a step S2, the first heat exchanger block module 28 and the second heat exchanger block module 29 are connected to one another by means of a positive connection. A step S3 of the method comprises connecting the first heat exchanger block module 28 and the second heat exchanger block module 29 to one another by means of the weld seam 30, so that the positive connection is at least partially covered by the weld seam 30.
[0131] During step S2, the first cover plate 5 of the first heat exchanger block module 28 and the second cover plate 6 of the second heat exchanger block module 29 are positively connected to one another by means of the respective connecting element 47, 60, 70.
[0132] In particular, during step S1, a plurality of recesses 48 to 50 are provided on the first cover plate 5, in each of which a connecting element 60, 70 is received, wherein recesses 51 to 53 are also provided on the second cover plate 6, in which the respective connecting element 60, 70 is also received. During step S2, bores 54 to 59, 61 to 63 are made in the first cover plate 5, in the second cover plate 6 and in the respective connecting element 60, wherein the first cover plate 5, the second cover plate 6 and the connecting element 60 are pinned to one another with the aid of pins 64 to 66. As a result, the cover plates 5, 6 and the connecting element 60 or the connecting elements 60 are integrally connected to one another.
[0133] Although the present invention has been described using exemplary embodiments, it can be modified in many ways.
[0134] Reference symbols used
[0135] 1 plate heat exchanger
[0136] 2 heat exchanger block
[0137] 2A heat exchanger block
[0138] 2B Heat exchanger block
[0139] 2C heat exchanger block
[0140] 2D heat exchanger block
[0141] 2E heat exchanger block
[0142] 3 Heat exchange element
[0143] 4 dividing plate
[0144] 5 Cover plate
[0145] 6 Cover plate
[0146] 7 Sidebar
[0147] 8 Sidebar
[0148] 9 Connection device
[0149] 10 Connection device
[0150] 11 Connection device
[0151] 12 Connection device
[0152] 13 Connection device
[0153] 14 Connection device
[0154] 15 Connection device
[0155] 16 Connection device
[0156] 17 Connection device
[0157] 18 Connection device
[0158] 19 connecting pieces
[0159] 20 connecting pieces
[0160] 21 connecting pieces
[0161] 22 connecting pieces
[0162] 23 connecting pieces
[0163] 24 connecting pieces
[0164] 25 connecting pieces
[0165] 26 Exterior area
[0166] 27 process plant
[0167] 28 Heat exchanger block module 29 Heat exchanger block module
[0168] 30 Weld seam
[0169] 31 Hook section
[0170] 32 hook section
[0171] 33 Hooking section
[0172] 34 Hooking section
[0173] 35 wedge element
[0174] 36 wedge element
[0175] 37 intervention section
[0176] 38 intervention section
[0177] 39 Counter-intervention section
[0178] 40 Counter-intervention section
[0179] 41 bore
[0180] 42 bore
[0181] 43 pen
[0182] 44 pin
[0183] 45 intervention section
[0184] 46 intervention section
[0185] 47 Connecting element
[0186] 48 recess
[0187] 49 Recess
[0188] 50 recess
[0189] 51 recess
[0190] 52 recess
[0191] 53 Recess
[0192] 54 bore
[0193] 55 bore
[0194] 56 bore
[0195] 57 bore
[0196] 58 bore
[0197] 59 Hole
[0198] 60 connecting element
[0199] 61 bore
[0200] 62 bore
[0201] 63 Hole 64 Pin
[0202] 65 pen
[0203] 66 pen
[0204] 67 bore
[0205] 68 bore
[0206] 69 Wave
[0207] 70 connecting element
[0208] 70' connecting element
[0209] 71 bore
[0210] 72 bore
[0211] 72' bore
[0212] 73 Double arrow
[0213] 74 Surface
[0214] 75 Surface
[0215] A Fluid
[0216] B Fluid
[0217] C Fluid
[0218] D Fluid d5 Thickness d6 Thickness d60 Thickness
[0219] E-Fluid
[0220] S area
[0221] 51 steps
[0222] 52 steps
[0223] 53 Step x Width direction y Height direction z Depth direction
Claims
Patent claims Plate heat exchanger (1) with a first heat exchanger block module (28) and a second heat exchanger block module (29), wherein the first heat exchanger block module (28) and the second heat exchanger block module (29) are connected to one another by means of a positive connection, wherein the first heat exchanger block module (28) and the second heat exchanger block module (29) are connected to one another by means of a weld seam (30), wherein the weld seam (30) covers the positive connection at least in sections, wherein the first heat exchanger block module (28) has a first cover plate (5), wherein the second heat exchanger block module (29) has a second cover plate (6), wherein the first cover plate (5) and the second cover plate (6) are connected to one another by means of the positive connection, wherein the first cover plate (5) and the second cover plate (6) are connected to one another in a positive connection by means of a connecting element (60, 70),wherein the first cover plate (5) has a recess (48-50) in which the connecting element (60, 70) is received, and wherein the second cover plate (6) has a recess (51-53) in which the connecting element (60, 70) is received. Plate heat exchanger according to claim 1, wherein the first cover plate (5) and / or the second cover plate (6) each have a thickness (d5, d6) of 8 to 18 mm, preferably of 10 to 16 mm, more preferably of 12 to 14 mm. Plate heat exchanger according to claim 1 or 2, wherein the first cover plate (5) and the second cover plate (6) are connected to one another by means of the weld seam (30). Plate heat exchanger according to one of claims 1 - 3, wherein the recess (48 - 50) of the first cover plate (5) extends into the first cover plate (5) starting from a surface (74) of the first cover plate (5) facing the second cover plate (6),and / or wherein the recess (51 - 53) of the second cover plate (6) extends from a surface (75) of the second cover plate (6) facing the first cover plate (5) into the second cover plate (6).
5. Plate heat exchanger according to one of claims 1 - 4, wherein a plurality of connecting elements (60, 70) are provided, and wherein the connecting elements (60, 70) have different thicknesses (d60).
6. Plate heat exchanger according to one of claims 1 - 5, wherein the connecting element (60) is pinned to the first cover plate (5) and to the second cover plate (6) by means of pins (64 - 66).
7. Plate heat exchanger according to claim 6, wherein the weld seam (30) covers the pins (64 - 66).
8. Plate heat exchanger according to claim 6 or 7, wherein the pins (64 - 66) are conical.
9. Plate heat exchanger according to one of claims 1 - 9, wherein the recess (48 - 50) of the first cover plate (5) is machined into the first cover plate (5) by means of a separating manufacturing process and / or a forming manufacturing process, and / or wherein the recess (51 - 53) of the second cover plate (6) is machined into the second cover plate (6) by means of a separating manufacturing process and / or a forming manufacturing process.
10. A method for producing a plate heat exchanger (1), comprising the following steps: a) providing (S1) a first heat exchanger block module (28) and a second heat exchanger block module (29), b) connecting (S2) the first heat exchanger block module (28) and the second heat exchanger block module (29) to one another by means of a positive connection, wherein a first cover plate (5) of the first heat exchanger block module (28) and a second cover plate (6) of the second heat exchanger block module (29) are positively connected to one another by means of a connecting element (47, 60, 70), wherein in step a) a recess (48 - 50) in which the connecting element (60, 70) is received is provided on the first cover plate (5), and wherein a recess (51-53) in which the connecting element (60, 70) is received is made in the second cover plate (6), and c) connecting (S3) the first heat exchanger block module (28) and the second heat exchanger block module (29) to one another by means of a weld seam (30), such that the positive connection is at least partially covered by the weld seam (30). Method according to claim 10, wherein in step b) bores (54-59, 61-63) are introduced into the first cover plate (5), into the second cover plate (6), and into the connecting element (60), and wherein the first cover plate (5), the second cover plate (6), and the connecting element (60) are pinned to one another by means of pins (64-66) inserted into the bores (54-59, 61-63).Method according to claim 10 or 11, wherein the recess (48 - 50) of the first cover plate (5) is machined into the first cover plate (5) by means of a separating manufacturing process and / or a forming manufacturing process, and / or wherein the recess (51 - 53) of the second cover plate (6) is machined into the second cover plate (6) by means of a separating manufacturing process and / or a forming manufacturing process.