CONNECTION AND JOINT ARRANGEMENT OF PLATE HEAT EXCHANGERS

Description

[0001] Connection arrangement and connection arrangement for plate heat exchangers, especially for scaling plate heat exchangers and coupling different heat sources and heat sinks.

[0002] Various couplings of plate heat exchangers are already known. For example, DE 10 2005 043 731 A1 describes a heat exchanger with at least two plate-shaped flow channels arranged parallel and spaced from each other, which are connected by at least one connecting channel bridging the gap. In this case, the at least one connecting channel is formed by two interlocking, self-centering pipe sockets.

[0003] Furthermore, DE 40 41 968 A1 discloses a latent heat storage system which enables the arrangement in a modular design by arranging spacers and spacer tubes in plate heat exchangers of any size that are well insulated from the outside to create storage cascades connected in series, the partition walls of which simultaneously fulfil the function of the heat exchangers.

[0004] It is also known from WO 2015 / 040065 A1 that a mounting sleeve with an internal thread is provided on an end plate of a plate heat exchanger between two connection openings. The end plate is reinforced in the area of ​​the mounting sleeve and between the connection openings by a special structuring and embossing of the end plate. Using the mounting sleeve, a so-called hydro-block with seals is placed over the connection openings and pressed against the end plate. The hydro-block has various connection options.

[0005] DE 691 06 354 T2 discloses a plate heat exchanger in which connecting pieces can be placed on the surface at connection openings, wherein the connecting pieces are clamped to the heat exchanger by a clamping device, wherein the clamping device is guided in the form of threaded rods through the outer plate and the connecting channels and is screwed to or with the respective connecting piece.

[0006] DE 10 2010 012 869 A1 discloses a plate heat exchanger in which a connection block is arranged on the end plate via two connection openings.

[0007] DE 10 2015 208 988 A1 discloses a plate heat exchanger in which connecting pieces are held on or in connection openings of the plate heat exchanger and the plate heat exchanger itself is held on a base by means of a retaining bracket.

[0008] CA 2,164,432 A1 discloses an arrangement of two plate heat exchangers which are clamped together by means of threaded rods guided through the connecting channels within the plate heat exchangers as a clamping device, wherein the threaded rods are screwed to the connecting pieces and to blind plugs on the opposite side of the plate heat exchangers.

[0009] Document IT PD 20100054 A1 discloses the features of the closest prior art and the features of the preamble of claim 1.

[0010] A disadvantage of the current state of the art is that plate heat exchangers currently only have one-sided connection options via connection nozzles soldered onto a closure or end plate. This precludes any space- and pipe-saving installation. Arranging the connections in any desired space-saving manner is therefore not possible. Mounting the connection options on the closure or end plate and simultaneously fastening them to this closure or end plate is an arrangement that can only be used to a very limited extent, as the compressive strength is limited and, in addition, the type of fastening causes excessive forces to act on the plate heat exchanger, resulting in stresses that cannot guarantee long-term reliability and therefore tightness.

[0011] Furthermore, the connection blocks known from the prior art have the disadvantage that they are designed as a single connection component for each of two adjacent connections and are very complex to manufacture. Furthermore, these connection components can only be used within a specified range. Furthermore, these connection components are fixed in their position and cannot be individually changed or adjusted, nor can they be rotated around a connection opening. Furthermore, the connection openings and the connection blocks are only designed to be located on one side or one of the external plates of the heat exchanger.The disadvantage of these connection blocks is that they are only clamped by means of a clamping sleeve that is arranged on the surface of this external plate, which means that a combined arrangement of several heat exchangers is not possible or only possible with great difficulty. In addition, the requirements for the stability of the clamping sleeve are very high and the respective sizes for suitable heat exchangers are very limited.

[0012] The object of the invention is to create a connection arrangement and connecting arrangement for plate heat exchangers as a single arrangement and as a multiple arrangement, whereby a flexible configuration of scalable heat exchanger expansion stages and individual heat exchanger types as well as interconnections for different heat sources and heat sinks as well as different temperature profiles and different media flows is to be achieved, which is also reliable and space- and pipe-saving.

[0013] The invention is defined by the features of claim 1 .

[0014] In the specified application, the invention achieves the creation of a simple connection arrangement and joining arrangement as a connection arrangement for connecting at least one plate heat exchanger to a respective peripheral piping. However, the plate heat exchanger does not have any welded or soldered connecting pieces or connecting projections with or without threads at its connection openings. A connecting piece is arranged on the surface around the respective connection opening of the respective outer plate, for example the outer heat exchanger plate, the closure plate or the end plate in the respective alignment of at least one of the connecting channels or the connection opening, wherein the connecting piece is clamped to and / or against the plate heat exchanger.The connectors, which can range from simple pipes to functional elements, create a flexible connection and connection option that enables direction- and function-independent connections and joints with a plate heat exchanger that is easy to manufacture. Complex and space-consuming piping and the constant adaptation of the piping to, for example, welded or soldered connection pieces or connection attachments are eliminated. The invention achieves a very high degree of flexibility in the wiring and connection of the plate heat exchangers, with the connectors also being part of the peripheral piping, simplifying the circuits and connections of the plate heat exchangers and reducing space requirements.The effort required to manufacture the connections to the plate heat exchanger can be reduced to a minimum with the use of connecting pieces, which also simplifies their insulation. Furthermore, components that are inexpensive to manufacture in large quantities can be used for the connections. The use of plate heat exchangers that do not have, for example, welded or soldered connection nozzles or connection bosses on their connection openings also enables a cost-effective assembly, as these heat exchangers without welded or soldered connection nozzles or connection bosses are significantly less expensive than plate heat exchangers with, for example, welded or soldered connection nozzles or connection bosses.

[0015] The connection arrangement and joint assembly according to the invention can be used for varying pressure levels, such as those encountered in district heating systems. This ensures uniform and flat support and pressure against tilting, thus clamping the connecting pieces against or with the plate heat exchanger and against the surface around the respective connection opening of the plate heat exchanger, and achieving the required tightness.

[0016] According to the invention, two, three, or more plate heat exchangers are connected via the connection arrangement and connecting arrangement. For this purpose, at least one connecting piece is arranged between the plate heat exchangers to connect at least two plate heat exchangers, in alignment with at least one of the connecting channels or at least one of the connection openings. An extension of existing individual or multiple plate heat exchangers connected or connected according to the invention is also possible. The additional plate heat exchanger(s) can be connected to the existing connecting pieces or, if necessary, to be replaced according to the desired flow pattern.The respective connecting piece is placed on the surface around the connection opening of the respective outer plate of the respective plate heat exchanger and clamped with or against at least one of the respective plate heat exchangers by means of a clamping device. However, according to the invention, the clamping can also be carried out across multiple plate heat exchangers, for example, the respective outer plate heat exchangers, without each connecting piece being clamped individually or individually or as a group with one or the respective plate heat exchanger, but rather across the entire arrangement of plate heat exchangers.

[0017] This means that the respective plate heat exchangers are connected mechanically and / or hydraulically.

[0018] The invention thus achieves the creation of a connection arrangement and connecting arrangement of at least two plate heat exchangers for interconnecting them and for connecting at least one of the plate heat exchangers to a respective peripheral piping. The plate heat exchangers are arranged, for example, as a parallel and / or serial cascade, and the plate heat exchangers consist of brazed heat exchanger plates and have connecting channels and connection openings arranged transversely to the heat exchanger plates in an outer plate. This outer plate can, for example, be an outer heat exchanger plate or a closure plate or end plate. The plate heat exchangers are mechanically and / or hydraulically connected.A connecting piece is arranged between the plate heat exchangers in alignment with at least one of the connecting channels or connection openings, wherein the at least one connecting piece is placed on the surface around the connection opening of the respective outer plate, which can be an external heat exchanger plate, a closure plate, or an end plate, and is clamped to or against at least one of the respective plate heat exchangers. This makes it possible to connect two, three, or more plate heat exchangers, for example in a cascade, and also to connect them to the peripheral piping so that they are individually scalable in their resulting size, have special heat exchanger designs, such as a U- or Z-shaped heat exchanger, and also enable different functions and flow patterns for different heat sources or heat sinks.Simple plate heat exchangers can also be used for this purpose, which do not have the factory-fitted, for example, welded or soldered connection pieces or connection bosses on the connection openings, i.e., external plates without, for example, welded or soldered connection pieces or connection bosses on the connection openings. The connecting pieces with a seal or the connecting pieces directly as a seal are placed or arranged on the surface of the respective external plates on or around the respective connection openings of the respective connecting channels in the outer heat exchanger plates, end plates, or end plates, and are clamped to and with at least one of the plate heat exchangers by at least one clamping device.This also ensures that any forces caused by tensions and loads on the heat exchanger and its connecting pipes are absorbed by the connecting pieces firmly clamped to the plate heat exchanger. Direct loads on individual areas or plates of the plate heat exchanger, as occurs with conventional plate heat exchangers equipped with connecting pieces or clamping sleeves, are thus eliminated. This also prevents leverage effects that would lead to leaks.

[0019] Depending on the design and requirements, the connection between the plate heat exchangers formed by the connecting pieces also enables a direct flow connection of the heat exchange media between the opposite connection openings. However, the flow connection can also be indirect or blocked.

[0020] It is possible to provide virtually any scaling of transfer capacities, since any combination of heat exchangers' standard capacities can lead to a desired output. This makes it possible to provide dynamic performance adjustment. Furthermore, this connection and connection arrangement allows for different designs of plate heat exchangers, for example, as Z-shaped heat exchangers, as U-shaped heat exchangers, or even asymmetrical heat exchanger arrangements. In each case, simplified designs of standardized heat exchangers can be used, eliminating the need for expensive and complexly manufactured heat exchangers with special shapes. Plate heat exchangers of different designs can be combined with one another according to requirements, depending on the embossing of the heat exchanger plates.This means that even mirrored heat exchanger arrangements can be implemented easily and with little material expenditure. Furthermore, flexibility increases, as such an arrangement can be adapted to actual requirements at any time without completely rebuilding or replacing the heat exchanger. This also applies in the event of a breakdown. Furthermore, different heat exchanger media and heat exchanger groups can be coupled together in such a way that the greatest possible efficiency is achieved in terms of heat transfer. Connectors with a cylindrical cross-section are preferred. However, connectors with a square cross-section can also be used. The key factor is the accuracy of fit to the respective connection opening orto the respective surface of the heat exchanger plate or end plate to ensure tightness, although a gasket or the connector is used directly as a seal between the connector and the surface. The shape and size of the internal cross-section depends on the requirements of the respective circuit configuration. In the simplest case, the internal cross-section of the connector corresponds at least to the shape and size of the respective connection opening.

[0021] The connecting piece is also understood as both a connection piece and an end piece, since the connecting piece can be used, for example, in addition to mechanical and hydraulic connections, to create corresponding connections and branches with or without further additional functions, as well as blind plugs or, for example, locks to close connection openings not used hydraulically or to prevent hydraulic connections. For the sake of simplicity, the term connecting piece is used, whereby both the connection piece and the end piece are included. The connecting piece as such or as a connecting piece conceptually and functionally comprises the respective connections and connections from at least one heat exchanger to the peripheral piping and the respective connections and connections from at least one heat exchanger to at least one other heat exchanger connected to it.

[0022] For simplicity, the plate heat exchanger is also called a heat exchanger.

[0023] Peripheral piping is also referred to simply as the periphery. Periphery also includes other components that are mechanically, hydraulically, or functionally connected to the heat exchanger(s).

[0024] The distinction between connection arrangement and connection arrangement serves to conceptually separate the connection of a heat exchanger to a peripheral device or the connection and interconnection of multiple heat exchangers. Technically, the connection arrangement and connection arrangement represent both mechanical and hydraulic connections. The respective requirements for stability and tightness are the same in each case. Furthermore, it is important to keep mechanical stresses in the arrangement as low as possible.

[0025] The mechanical and hydraulic connections are understood as the connections between the plate heat exchangers made by the connecting pieces, the intermediate pieces and / or the peripheral piping, regardless of whether these allow or prevent a flow connection.

[0026] The connector is advantageously designed as a single-piece or multi-piece. This allows for the production of various advantageous designs and variants. In addition to the production of simple connectors, connectors can also be assembled to suit the specific heat exchanger.

[0027] By providing at least one intermediate piece between two connecting pieces or two connecting piece parts, any distance or any function or component can be implemented between adjacent plate heat exchangers, for example, with standardized connecting pieces. This ensures that the connecting pieces are uniform, for example, with respect to the plate heat exchanger and, for example, with respect to length, and simple intermediate pieces, for example in the form of simple tubes, are used for different distances.

[0028] In a further development, the connecting piece and / or the intermediate piece are impervious or at least partially permeable to flow. This allows for the implementation of circuit separations or static flow reducers, as well as blind plugs. This allows connecting pieces to be arranged at the connection openings of the plate heat exchangers, which, depending on the circuit configuration, allow or prevent flow or a flow connection. The formation of complex serial or parallel cascades of plate heat exchangers is facilitated. This allows the connecting pieces to be used universally between plate heat exchangers or peripherally outside.

[0029] Advantageously, the connecting pieces and / or the intermediate pieces are at least partially permeable to flow, thereby forming sub-areas through which a connection can be established with other sub-areas or sub-circuits. These sub-areas can be serial or parallel cascades of plate heat exchangers. Sensors or other components can also be arranged in the connecting pieces.

[0030] In a further development of the invention, the connecting piece protrudes into the connection opening or can be centered in the connection opening. This independently achieves positional stability and reliable positioning at the connection opening.

[0031] Advantageously, the connector has an oversize over the connection opening. This ensures that the connector fits more securely against or around the connection opening, even if lateral displacement of the connector is necessary for adjustment. This promotes a secure fit of the connector or seal.

[0032] Because the connecting piece and / or the intermediate piece has at least one branch, connections to other connecting pieces, heating circuits, consumer circuits, or other heat sources can be created directly at the respective connection and plate heat exchanger, as well as between the heat exchangers. In conjunction with the flow-through sub-areas, such branches can be created in a connecting piece and / or with an intermediate piece for different sub-circuits or connections. These connections can also be arranged multiple times around the outer circumference of the respective connecting pieces and / or intermediate pieces, if necessary, for example, for various outlets and transitions to other plate heat exchangers or to create a specific heat exchanger shape and configuration. This also facilitates the formation of complex serial or parallel cascades of plate heat exchangers.Branches are understood to mean both branches and merging or feeding of media streams.

[0033] In a further development of the arrangement, the connecting piece and / or the intermediate piece has a barrier wall and / or partition wall transversely and / or longitudinally to the alignment of the connecting channels. This also makes it possible for no direct flow connection between the opposite connection openings to be possible via the connecting pieces due to the partition wall or barrier wall, but for other connections to other partial circuits or heat exchangers or other connection openings to be created by means of the branches. For example, two different flow connections can be created via a connecting piece and / or an intermediate piece by each flow connection being led via a connecting piece and / or intermediate piece provided with a partition wall into two opposite connection openings, without the respective media being connected or mixed in the connecting piece and / or intermediate piece. In addition, the formation of serial orparallel cascades of plate heat exchangers.

[0034] Advantageously, the connecting piece and / or the intermediate piece can be arranged in any direction around the alignment of the connecting channels or around the connection opening, enabling direct and short routing of the piping of the plate heat exchangers and their peripherals. This allows branches to be rotated directly in the desired direction and laid optimally or efficiently, eliminating the need for costly and complex angles or other fittings, or at least significantly reducing their number. Furthermore, depending on whether branches or other arrangements that hinder rotation are present, the connecting pieces and / or the intermediate pieces can be rotated into a desired or stress-free position until the final clamping.Since the connecting pieces are sealed against the surface of the outer plate, which is an external heat exchanger plate, end plate, or intermediate piece, either by means of a self-sealing gasket or, for example, a zero-ring seal, they can be easily rotated into their final position. Depending on the required compressive strength of the overall assembly, rotating the connecting pieces and / or intermediate pieces may not be possible or may only be possible to a limited extent, as the contact pressure must be selected to be sufficiently high to prevent instability of the overall assembly and tilting of the connecting pieces relative to the surface of the outer plate, as this would lead to leaks.

[0035] Since the connecting piece and / or the intermediate piece and / or the branch advantageously has at least one valve, filter, a pump and / or a thread, it is possible to implement the connection, control or disconnection of flow connections as well as various circuits through plate heat exchangers, the connecting pieces, the intermediate pieces and / or the branch.

[0036] This makes it possible to create or suppress partial flows, or to shut down entire arrays of serial or parallel cascades of plate heat exchangers or to additionally control them. This also makes it possible to prepare an array for later expansion without having to completely dismantle it at some point in the future.

[0037] In a further development of the invention, the connecting piece is designed as an end piece or as a blind plug. An end piece or a blind plug is arranged, for example, at the respective external connection openings of the plate heat exchangers. This results in particular in a structural simplification, as the number of necessary parts can be minimized. In addition to fewer parts, a space-saving and material-saving design is also achieved. Furthermore, with the connecting pieces as end pieces or blind plugs, an individual heat exchanger is already prepared in such a way that it can be supplemented by another heat exchanger by exchanging or modifying the end pieces or blind plugs for or with other, for example continuous connecting pieces, if there is a need for more power, for example.

[0038] On the other hand, blind plugs or other components or pipes can be conveniently mounted directly onto the connectors or the connectors can form these directly.

[0039] Advantageously, the connecting piece comprises at least one seal, which facilitates simple and reliable assembly.

[0040] By designing the connecting piece as a gasket or sealing disc, a structural simplification is achieved, which is also advantageous for arrangements upstream of heat exchangers that are arranged directly next to one another without the need for branches between the heat exchangers. For example, several plate heat exchangers can be arranged close together with minimal space requirements. In this way, different performance levels can be achieved in a small space using individual plate heat exchangers by arranging them and combining the corresponding individual outputs. By designing the connecting pieces as gaskets or sealing discs, a structurally simple and efficient design is achieved as a combination of different functions.

[0041] Advantageously, two or more connectors are designed as a connection block or as a connection assembly for two or more connection openings. This allows for structural simplifications and increased stability of the arrangement of connectors and plate heat exchangers, or of connectors and plate heat exchangers. Furthermore, the clamping of the connectors designed as a connection block or connection assembly is simplified.

[0042] By locating the clamping device outside the plate heat exchanger, the connecting pieces can be clamped more easily to the plate heat exchanger(s), depending on the design and requirements. This also makes it easier to create customized connections between plate heat exchangers, each other, and their peripherals.

[0043] In a further development of the arrangement, at least one connecting piece is clamped to the plate heat exchanger(s) as a package, creating a secure, stable and media-tight assembly which meets the high requirements of pressure tightness and also places no or only minimal mechanical stress on the plate heat exchanger in such a way that the internal structure is not endangered and the outer plate in particular is not subjected to tensile stress.

[0044] By clamping the at least one connecting piece to or against the at least one plate heat exchanger with at least one clamping device that engages around and / or behind the at least one plate heat exchanger and / or the at least one connecting piece, a secure and stable connection is created, which significantly improves the stability of the overall arrangement and particularly meets the high requirements for pressure tightness or freedom from stress within the plate heat exchangers and their arrangement. At the same time, assembly is simplified because the connecting pieces are better guided and held.This also includes clamping devices which, for example, are made of flat material and are pushed onto the connecting pieces and rest against a rim, a flange or a snap ring on the heat exchanger-side end of the connecting piece. Outside the plate heat exchanger, they are pulled around it using, for example, a threaded bolt and nut and against, for example, another flat material with or without connecting pieces, thus clamping the connecting piece(s) to the plate heat exchanger. Other clamping variants include, for example, clamping at the edges of the plate heat exchanger by gripping behind them. Other combinations or other arrangements and orientations of clamping elements are also possible, each of which clamps the connecting pieces against the plate heat exchanger.

[0045] According to the invention, the at least one connecting piece and / or the plate heat exchanger(s) is / are clamped with a clamping device guided through the connection opening and the connecting channel and the connecting piece. This eliminates the need for complex structures for implementing the clamping device outside the plate heat exchanger and allows the clamping device to be arranged simply within the plate heat exchanger and guided through the standard or customary openings. Additional openings or individual adaptations of the plate heat exchanger are not required. This results in a more efficient connection arrangement and connection configuration. Furthermore, greater stability is achieved.

[0046] According to the invention, the clamping device is not screwed or clamped to the at least one connecting piece and / or guided through the connecting piece. This achieves a concealed or hidden installation within the connecting pieces and the heat exchanger(s). At the same time, the connecting pieces are simplified, since, depending on the design, openings and additional seals can be omitted. In each case, stability is additionally increased independently of one another.

[0047] As the clamping device is not guided through the connecting piece according to the invention, concealed clamping is also facilitated.

[0048] In this case, for example, the clamping device is screwed and / or guided in or with the connecting piece or through the connecting piece and clamps the connecting piece against the plate heat exchanger.

[0049] In a further development of the invention, the clamping device comprises at least sheets or plates and / or screws or threaded rods with nuts, which promotes reliable clamping that absorbs the forces that occur and also improves the necessary tightness.

[0050] If necessary, holes are provided in the sheets or panels for the insertion or screwing of screws or threaded rods. If the screws or threaded rods are to be screwed directly to the sheets or panels, threads are preferred in the holes.

[0051] Depending on the requirements and necessity, the panels or sheets have at least one opening into and through which the connecting piece can be inserted or pushed. If no connecting pieces need to be pushed through the panels or sheets, the openings can be omitted.

[0052] Preferably, the at least one connecting piece on the outer wall in the circumferential direction comprises at least one radial projection, for example in the form of a rim, a flange, a flange-like projection and / or a snap ring, guided in a groove.

[0053] Alternatively or additionally, at least one tensioning bar is provided within the connecting piece. This promotes tensioning within the connecting pieces and also enables the flow of media.

[0054] In the case of one-sided installation, the connecting piece on the outer wall can, for example, have a conical cross-section that widens towards the respective outer panel, on which the respective opening of the panel rests and the displacement of the panel for tensioning is inhibited.

[0055] The respective independent design variants on the external wall, in the cross-section, or within the connecting piece facilitate clamping, as the clamping device presses evenly and evenly against the connecting pieces, thus ensuring minimal tension in the clamping of the connecting pieces against or with the plate heat exchanger or against or with the surface around the respective connection opening of the plate heat exchanger. Tilting and the associated leaks can be reduced or avoided.

[0056] Regardless of the specific clamping device and its components as well as regardless of the specific suitable design of the connecting pieces, the connecting pieces are preferably clamped vertically against or with the plate heat exchanger as well as against the surface around the respective connection opening of the plate heat exchanger.

[0057] Increased stability of the resulting arrangement and improved sealing effect are achieved.

[0058] Different designs are possible, each fulfilling the described effect and function.

[0059] Several embodiments of the invention are illustrated in the drawings and described in more detail below. They show: Fig. 1 a non-inventive representation with a plate heat exchanger with clamped connecting pieces at the connection openings and prepared clamping device for another plate heat exchanger, Fig. 2 a non-inventive representation with two plate heat exchangers with connecting pieces at the connection openings with a clamping device clamping the two plate heat exchangers with the connecting pieces as a package, Fig. 3two plate heat exchangers with clamped connecting pieces at the connection openings, using different variants of a clamping device, Fig. 4 a non-inventive representation with a plate heat exchanger with clamped connecting pieces at the connection openings and prepared clamping device for another plate heat exchanger, Fig. 5 Non-inventive design of four plate heat exchangers as a branched cascade with connecting pieces as sealing discs at the connection openings and with clamping devices guided inside the plate heat exchanger, through this, Fig. 6 Non-inventive embodiment of two connected plate heat exchangers with connecting pieces and end pieces at the connection openings and with clamping devices guided inside the plate heat exchanger, through this, Fig. 7the sectional view of the non-inventive embodiment of a plate heat exchanger with connecting pieces with branches at the connection openings and with clamping devices guided and arranged within the plate heat exchanger and the connecting pieces, Fig. 8 three plate heat exchangers as a branched cascade with connecting pieces at the connection openings, whereby the clamping device is not shown for simplification, Fig. 9 three plate heat exchangers, each of the same size and therefore performance, arranged as a cascade with connecting pieces at the connection openings, whereby the clamping device is not shown for simplification, Fig. 10 three plate heat exchangers as a cascade, each of different sizes with connecting pieces at the connection openings, whereby the clamping device is not shown for simplification, Fig. 11two plate heat exchangers with connecting pieces at the connection openings as U-heat exchangers with central connection and with flow path, whereby the clamping device is not shown for simplification, Fig. 12 two plate heat exchangers with connecting pieces at the connection openings and with a complex piping, whereby the clamping device is not shown for the sake of simplicity, Fig. 13 two plate heat exchangers with connecting pieces at the connection openings in a mirrored arrangement with flow path, Fig. 14a to Fig. 14e schematic representations of different circuits of plate heat exchangers with connecting pieces at the connection openings and with flow pattern, whereby the clamping device is not shown for simplification, Fig. 15 five plate heat exchangers as a branched cascade, whereby the clamping device is not shown for simplification, Fig. 16a and 16eSectional views as a detail of the non-inventive design of connecting pieces with clamping device each at a connection opening of an external plate, Fig. 16b to 16d Sectional views of connecting pieces with clamping device at a connection opening of an external plate and Fig. 17 schematic representations of a plate or sheet as part of a clamping device and of connecting pieces with bayonet.

[0060] In the connection arrangement according to the invention for connecting a plate heat exchanger 1 to a respective peripheral piping, the plate heat exchanger 1 consists of brazed heat exchanger plates 2 which have connecting channels 3 running transversely to the heat exchanger plates 2 and connection openings 4 in an outer plate 5. A connecting piece 6 is arranged on the surface around the connection opening 4 of the respective outer plate 5 in alignment with at least one of the connecting channels 3 or at least one of the connection openings 4, wherein the connecting piece 6 is clamped to or against the plate heat exchanger 1. The outer plate 5 can be the respective outer heat exchanger plate 2 or end plate 5, or end plate 5. This depends on the specific plate heat exchanger 1 used.

[0061] In Figure 7As an embodiment not according to the invention, a single, known plate heat exchanger 1 is shown in side section. Connecting pieces 6 are arranged on the surface of the outer plate 5 around the connection opening 4 of the respective outer plate 5 in alignment with the connecting channels 3, each having radially arranged branches 11 for connection to further peripherals and installation. The clamping of the connecting pieces 6 is achieved by means of a clamping device 9 comprising a threaded rod 13 or a rod 13 with partially threaded areas at the respective ends as well as nuts 16 or cap nuts 17. The first end is screwed within a connecting piece 6 into a blind hole with an internal thread 12 in the closed front end of the connecting piece 6, which is arranged on or around one of the connection openings 4 on the right-hand side of the plate heat exchanger 1 shown.The threaded rod 13 or rod 13 is guided through connection openings 4 and the connecting channel 3. On the opposite, i.e., left-hand side of the illustrated plate heat exchanger 1, the threaded rod 13 or rod 13, or its second end, is guided through a second connecting piece 6 and a through-bore 14 at the front end of the second connecting piece 6.

[0062] Seals 15, for example O-rings, are arranged between the outer plate 5 and the connecting pieces 6.

[0063] Depending on the circumstances and requirements, as in Figure 7As shown in a non-inventive embodiment on the upper connecting pieces 6, a nut 16 is first screwed onto the second end, by means of which the two connecting pieces 6 are clamped against the surface of the outer plate 5 around the connection opening 4 and the plate heat exchanger 1 with the necessary force for stability and tightness. The tightness of the screw connection of the nut 16 is additionally achieved by a further screwed-on cap nut 17 with a seal 15. This ensures that, on the one hand, the contact pressure of the connecting pieces 6 and, on the other hand, the tightness of various components are achieved, which are specifically designed for the respective task.

[0064] Instead of the threaded rod 13 or rod 13, a screw 13 of appropriate length and with a suitable screw head can be used, which on the one hand ensures the strength and on the other hand the tightness without overloading or destroying the seal.

[0065] Another possible implementation is as in Figure 7 as a non-inventive embodiment on the lower connecting pieces 6, the pressing and sealing is realized with only one cap nut 17 with seal 15.

[0066] The connection arrangement and connecting arrangement according to the invention of at least two plate heat exchangers 1, for example as a parallel and / or serial cascade, wherein the plate heat exchangers 1 consist of soldered heat exchanger plates 2 and have connecting channels 3 arranged transversely to the heat exchanger plates 2 and connection openings 4 in an outer plate 5, wherein the plate heat exchangers 1 are mechanically and / or hydraulically connected, comprises a connecting piece 6 between the plate heat exchangers 1 in alignment with at least one of the connecting channels 3 or at least one of the connection openings 4, wherein the at least one connecting piece 6 is placed on the surface around the connection opening 4 of the respective outer plate 5 and is clamped with or against at least one of the respective plate heat exchangers 1.

[0067] This connection arrangement and connection arrangement is in the Figures 3 , 8 to 15 shown.

[0068] Figure 1 shows a heat exchanger with connecting pieces 6 in the form of pipe sections at each of the connection openings 4, which are arranged with a seal 15 (partially not shown) on the surface of the outer plate 5 around the connection opening 4 of the respective outer plate 5 in alignment with the connecting channels 3.

[0069] For example, a sheet 18 or a plate 18, preferably made of metal, is pushed onto two adjacent connecting pieces 6, wherein openings 34 are provided in the sheet 18 or plate 18 corresponding to the shape and size of the cross-section of the connecting pieces 6. The connecting pieces 6 are guided through these openings 34 in the respective sheets 18 or plates 18.

[0070] At the respective end of the connecting pieces 6 facing the connection opening 4, there are radially projecting snap rings 20 inserted into grooves 19. As an alternative to one of the snap rings 20, a flange-like projection is provided at one end, as shown in the Figures 16b and 16c shown, present.

[0071] However, the openings 34 in the sheets 18 or plates 18 are smaller than the snap rings 20 or the flange-like projection 30, so that the snap rings 20 or the flange-like projection 30 provide the necessary support surface for the sheets 18 or plates 18 and the connecting pieces 6 can be clamped to the plate heat exchanger 1 via the sheets 18 or plates 18.

[0072] The sheets 18 or plates 18 project beyond the plate heat exchanger 1 at two opposite outer edges. In the projecting areas of the sheets 18 or plates 18, bores are provided through which a screw 13 or a threaded rod 13 is passed. By means of said screw and at least one nut 16, the two adjacent sheets 18 or plates 18 arranged on the connecting pieces 6 on two opposite sides of the plate heat exchanger 1 are clamped together and against the plate heat exchanger 1. At least the sheets 18 or the plates 18 and the screw 13 or the threaded rod 13 with the nuts 16 form the clamping device 9.

[0073] In this specific embodiment of a connection arrangement and connecting arrangement, two connecting pieces 6 from each of two adjacent connection openings 6 are clamped to the plate heat exchanger 1 and to each other opposite one another. The clamping device 9 thus encompasses the plate heat exchanger 1. This connection arrangement and connecting arrangement can also be easily implemented with only one plate heat exchanger 1, since the respective conditions are easily transferable.

[0074] In Figure 2 are different from Figure 1 two plate heat exchangers 1 not clamped according to the invention as a package via clamping devices 9, wherein the Figure 2 The plate heat exchanger 1 shown on the right has connection openings 4 only on one side and between the plate heat exchangers 1, the four connection openings 4 are connected via four connecting pieces 6 in the form of pipe sections. Figure 2The plate heat exchanger 1 shown on the left has corresponding connecting pieces 6 on the outside left, which, as shown Figure 1 described, have snap rings 20 or a flange-like projection 30 and correspondingly designed sheets 18 or plates 18 at the plate heat exchanger end. Figure 2 The sheets 18 or plates 18 shown on the right have no openings. The respective sheets 18 or plates 18 project beyond the plate heat exchanger 1 at opposite outer edges. The two plate heat exchangers 1 as well as the intermediate and outer connecting pieces 6 are as shown in Figure 1As described, they are clamped via screws 13 or threaded rods 13 with nuts 16. Seals 15, some of which are not shown, are provided at the respective connection openings 4 between the outer surface of the plates 5 and the connecting pieces 6. At least the sheets 18 or the plates 18 and the screw 13 or the threaded rod 13 with the nuts 16 form the clamping device 9. The clamping device 9 encompasses the plate heat exchanger 1.

[0075] In Figure 3 are different from Figure 2 the connecting pieces 6 in the form of pipe sections are clamped at their ends to the respective plate heat exchanger 1 at their end via clamping devices 9, which in the specific embodiment comprises plates 18 or sheets 18 and screws 13 or threaded rods 13 and nuts 16, wherein the Figure 3The plate heat exchanger 1 shown on the right has connection openings 4 only on one side and the clamping device 9 on this plate heat exchanger 1 additionally comprises fastening means 21.

[0076] Between the plate heat exchangers 1, the four connection openings 4 are connected via four connecting pieces 6, whereby the connecting pieces 6 are connected with snap ring 20 or flange 30 with the Figure 3 plate heat exchanger 1 shown on the right are clamped by means of the above-described plates 18 or sheets 18 projecting beyond the plate heat exchanger 1 at opposite outer edges and by means of screws 13 or threaded rods 13 and nuts 16, wherein suitable fastening means 21 or correspondingly suitable screw heads or correspondingly suitable nuts 16 form the edges of the unopened outer plate 22 as the back of the plate heat exchanger shown in the Figure 3engage behind the plate heat exchanger 1 shown on the right, in order to provide the necessary contact pressure for the stability and tightness of the transitions of the connecting pieces 6 to the connection openings 4. Due to the design of the plate heat exchanger 1, the edge on the unopened outer plate 22 of the rear side is designed as a web-like structure all the way around and thus provides the necessary hold for the other suitable fastening means 21 or the correspondingly suitable screw head or the correspondingly suitable nut 16.

[0077] The one in the Figure 3 The plate heat exchanger 1 shown on the left has corresponding connecting pieces 6 on the left and right, which, as shown Figure 1described, have snap rings 20 or a flange-like projection 30 and correspondingly designed sheets 18 or plates 18 at the plate heat exchanger end. The respective sheets 18 or plates 18 project beyond the plate heat exchanger 1 at opposite outer edges. The connecting pieces 6 and the plate heat exchanger 1 located therebetween are as in Figure 1 described above, clamped by screws 13 or threaded rods 13 with nuts 16. Seals 15 (some not shown) are provided at the respective connection openings 4 between the outer surface of the plates 5 and the connecting pieces 6.

[0078] In Figure 4 are different from the Figures 13Transverse to the alignment of the sheets 18 or plates 18, clamping plates 23 are provided, wherein the clamping plates 23 are each arranged between two connecting pieces 6 and project beyond the plate heat exchanger 1 at two opposite outer edges. The projection of the sheets 18 or plates 18 is no longer necessary here, since the clamping takes place via the clamping plates 23. The clamping takes place, as described above, by means of screws 13 or threaded rods 13 and nuts 16. The clamping device 9, formed at least from sheets 18 or plates 18, clamping plates 23, screws 13 or threaded rods 13 and nuts 16, encompasses the plate heat exchanger 1.

[0079] However, the clamping plate 23 can also be designed as an edgewise strip iron, since this reduces or avoids bending moments (not shown).

[0080] In Figure 5The connecting pieces 6 between the respective plate heat exchangers 1 are designed as sealing discs 6. This achieves a very space-saving arrangement that nevertheless offers a high degree of flexibility. The sealing discs 6 are suitable both as a continuous connecting piece and as an end piece 25 or blind plug 25.

[0081] The respective plate heat exchangers 1 are each clamped as an embodiment not according to the invention by means of a clamping device 9 guided through the respective connecting pieces 6 as sealing discs 6, through the respective connection openings 4 and the respective connecting channel 3.

[0082] The clamping device 9 comprises a threaded rod 13 or a rod 13 with partial threaded areas at the respective ends for screwing on nuts 16 or cap nuts 17. Depending on the circumstances and requirements, either a nut 16, possibly with a washer, is screwed on at the respective ends first and then a cap nut 17, which extends up to the sealing washer 6.

[0083] On the other hand, a sufficiently large cap nut 17 can also be screwed directly onto the sealing washer 6, since in this case the contact pressure and tightness are achieved equally, depending on the requirements, particularly with regard to pressure and stability.

[0084] On the other hand, it is sufficient to use a screw 13 of appropriate length and with a suitable screw head instead of the threaded rod 13 or rod 13, which ensures both strength and tightness with respect to the stability and sealing washer 6. The cap nut 17 can then be screwed onto the screw 13 accordingly.

[0085] Due to the simple design of the connecting pieces 6 as sealing discs 6 or as a pipe section, a position correction of the arrangement can be carried out until shortly before the final tightening of the clamping device 9.

[0086] In Figure 6 a further embodiment of a clamping device 9 not according to the invention is shown, in which a threaded rod 13 or a screw 13 is guided through the connection opening 4, the connecting channel 3 and into or through the connecting piece 6.

[0087] Between the Figure 6The plate heat exchangers 1 shown have simple connecting pieces 6 in the form of pipe sections, some with branches 11. Outside each of the plate heat exchangers 1 shown, connecting pieces 6 are provided in the form of pipe sections, which have clamping webs 24 inside them, transverse to the flow direction. The clamping webs 24 can each be flowed around laterally and are connected to the inner wall of the connecting pieces 6 or clamped to them.

[0088] The threaded rod 13 or the screw 13 is guided through a bore 14 in the tensioning web 24 in the respective connecting piece 6, through the respective connection openings 4, the respective connecting channels 3 and through the connecting pieces 6 in between, and again through a bore 14 in the tensioning web 24 in the other, opposite connecting piece 6, where it is screwed with a nut 16 or screwed directly into an internal thread 12 in the bore 14. Access to the threaded rod 13 or to the screw 13 and nuts 16 is therefore only possible axially through the pipe openings of the connecting pieces 6. Advantageously, only the seals 15 are present between the connecting piece 6 and the respective outer plate 5.

[0089] The at least one tensioning web 24 can also be designed in a correspondingly multiple embodiment to form two parallel, spaced-apart tensioning webs 24 or as a web cross, through which the threaded stand 13 or the screw 13 is guided (not shown).

[0090] Other designs are also possible, which are arranged within the connecting pieces 6 and allow passage or screwing and clamping with a screw 13 or a threaded rod 13 with, if necessary, a nut 16.

[0091] In each individual case and depending on the need, it must be taken into account that the resulting reduction in cross-section must be kept small or, if necessary, can be compensated by a larger cross-section of the respective connecting piece 6.

[0092] In the case of connecting pieces 6 as blind closure 25 or end piece 25, as already explained above, there are blind holes with internal thread 12 into which the screws 13 or threaded rods 13 guided through the arrangement can be screwed and are clamped via the clamping web 24 of the opposite connecting piece 6 by tightening the screw 13 or the nut 16.

[0093] Furthermore, the variant is provided that one connecting piece 6 as a blind closure 25 or end piece 25 is a blind hole with an internal thread 12 and the other connecting piece 6 is a sealing washer 6. The threaded rod 13 or the screw is guided through the sealing washer 6, through the respective connection openings 4, the respective connecting channels 3 and through the connecting pieces 6 located therebetween and is screwed to the connecting piece 6 as a blind closure 25 or end piece 25. The tightening or locking then takes place on the connecting piece 6 as a sealing washer 6 as described above.

[0094] In the Figures 8 to 12 , 14a to 14e and 15 For the sake of simplicity, the components of the clamping device 9 are not shown.

[0095] The Figure 8shows a possible arrangement as a serial cascade. Any number of circuits can be configured, which are operated or tapped according to energy requirements. This is further supported by valves and pumps in the connecting pieces 6 (not shown). The connecting pieces 6 can have branches 11, as shown, for example, in the Figures 6 , 7 and 12 shown in Figure 9 A parallel connection of three plate heat exchangers 1, each with the same power, is shown. This parallel cascade allows for scaling of the power by adding and blocking individual plate heat exchangers 1.

[0096] Different power levels can be mapped here, which can be switched as needed. For example, valves 7 and pumps (not shown) are used in the connecting pieces 6. The connecting pieces 6 can also have branches and feeds (not shown).

[0097] The Figure 10 shows a parallel connection of three plate heat exchangers 1, each with different outputs. This parallel cascade demonstrates the scaling of output through standardized plate heat exchangers 1, which are combined as required. Complex custom-made or expensive plate heat exchangers 1 with a specific output can be distributed among simple yet inexpensive plate heat exchangers 1, each with different outputs, and their combination to achieve the desired output. This also allows different output requirements to be mapped, which are switched as needed. Valves and pumps, for example, are also used in the connecting pieces 6 (not shown). The connecting pieces 6 can also have branches and feeders (not shown).

[0098] The Figure 11shows a heat exchanger arrangement consisting of two plate heat exchangers 1 of equal size in the specific exemplary embodiment, designed as U-shaped heat exchangers with exemplary flow directions 27. The connections between the individual plate heat exchangers 1 and also the pipe sections for connecting the periphery are formed by connecting pieces 6. The two connecting pieces 6 between the plate heat exchangers 1 in the upper area comprise a barrier wall 26, which prevents the flow through and thus ensures flow as a U-shaped heat exchanger. In the lower area of ​​the plate heat exchangers 1, two of the connecting pieces 6 are designed as blind plugs on the outside. The two central connections are also located on the outside in the lower area.

[0099] In Figure 12A connection arrangement and connection arrangement of two plate heat exchangers 1 is shown, between which, in addition to single-piece connecting pieces 6, there are also multi-piece connecting pieces 6 and two connecting pieces 6 with an intermediate piece 10 arranged therebetween. A branch 11 with a valve 7 is provided on each of the intermediate piece 10 and the multi-piece connecting pieces 6.

[0100] On the right side of the Figure 12 In the plate heat exchanger 1 shown on the right, connecting pieces 6 are provided as pipe sections in order to connect, for example, further peripherals or other components or plate heat exchanger 1.

[0101] The multi-part connecting pieces 6 between the two plate heat exchangers 1 each have a partition wall 26 in the boundary area of ​​the two parts of the connecting pieces 6.

[0102] On the left side of the Figure 12The plate heat exchanger 1 shown on the left features connecting pieces 6 as pipe sections to which branches 11 for the primary and secondary circuits are connected. The branches 11 are arranged parallel to one another to save space.

[0103] On the left side of the Figure 12 shown on the left and on the right side of the Figure 12 In the plate heat exchanger 1 shown on the right, there are connecting pieces 6 as pipe sections for connecting the further circuit structure, i.e. the periphery, as well as connecting pieces 6 as blind plugs 25.

[0104] The connection arrangement and connection arrangement of two plate heat exchangers 1 according to Figure 13shows a mirrored arrangement of the two plate heat exchangers 1 with an exemplary flow path 27. Between the two plate heat exchangers 1 are connecting pieces 6, each of which, depending on the circuit, has two barrier walls 26 or a branch 11. The branches 11 lead, for example, to the energy source, such as a boiler, or to the district heating connection.

[0105] The two connecting pieces 6 located in alignment with the connecting pieces 6 with branch 11, the connection openings 4 and the connecting channels 3 as blind closures 25 on the outside of the two plate heat exchangers 1 according to Figure 13 are not clamped according to the invention by means of threaded rods 13 with nuts 16 as clamping device 9 guided through the connecting pieces 6 with branch 11, the connection openings 4 and the connecting channels 3 as well as through the connecting pieces 6 as blind closures 25.

[0106] The other four connecting pieces 6 on the outer sides of the plate heat exchanger 1 and the connecting pieces 6 arranged between the plate heat exchangers 1 with the two barrier walls 26 are clamped together by means of plates 18 and screws 13 with nuts 16. The connecting pieces 6 have corresponding snap rings 20 or flanges 30 or rims 30 (not shown) on the outer sides. This exemplary embodiment shows that different clamping variants can also be combined with one another.

[0107] The schematically illustrated connection arrangement and connection arrangement of plate heat exchangers 1 shows according to Figure 14a a parallel connection of two and according to Figure 14b a serial connection of three plate heat exchangers 1 with exemplary flow pattern 27.

[0108] Between the two plate heat exchangers 1 are connecting pieces 6, some of which have barrier walls 26, particularly for serial connection according to the desired flow pattern. Likewise, connecting pieces 6 are provided outside each plate heat exchanger 1, which, depending on the flow pattern and requirements, have barrier walls 26 or are designed as end pieces 25. The connecting pieces 6 between the plate heat exchangers 1 can also be reduced to a very short length or designed directly as a sealing disc 6, provided branches 11 are not required. This creates a very compact arrangement with minimal space and piping requirements.

[0109] The Figure 14cshows, by way of example, the schematic connection arrangement and connection layout of three plate heat exchangers 1 with an exemplary flow pattern 27, depicting three circuits. A primary volume flow 31 supplies a heating circuit 33 via one plate heat exchanger 1 and a two-stage DHW heating system with circulation via two further plate heat exchangers 1, each as a secondary circuit 32. The primary volume flow 31 is directed from the heating circuit 33 to the DHW heating system to utilize the residual heat.

[0110] Between the two plate heat exchangers 1, connecting pieces 6 are arranged, some of which have barrier walls 26 according to the desired flow pattern. Branches 11 are provided in the connecting pieces for supplying and tapping the respective volume flows.

[0111] In Figure 14dis an example of the schematic connection arrangement and connection arrangement of two plate heat exchangers 1 with an example flow pattern 27, wherein for one circuit the plate heat exchangers 1 are connected in parallel and for the other circuit the plate heat exchangers 1 are connected in series.

[0112] Connecting pieces 6 are arranged between the two plate heat exchangers 1, some of which have barrier walls 26 according to the desired flow pattern. The connecting pieces 6 between the plate heat exchangers 1 can also be reduced to a very short length and designed directly as a sealing disc 6 or partition wall 26. This creates a very compact arrangement with minimal space and piping requirements.

[0113] The Figure 14eshows the schematic connection arrangement and connection arrangement of four plate heat exchangers 1 with an exemplary flow path 27, wherein the four plate heat exchangers 1 are connected in parallel, for example, on the primary side and are flowed through by a primary volume flow 31. The respective secondary circuits 32 of the four plate heat exchangers 1 each form their own circuits, which are tapped or connected via branches 11 in the connecting pieces 6. The valves 7 in the branches 11 control the media flow individually for each secondary circuit 32 as required. The valves 7 can also be provided directly in the connecting pieces 6, as shown, and likewise control the media flow as required.

[0114] The connecting pieces 6 arranged between the two plate heat exchangers 1 have barrier walls 26 according to the desired flow pattern. In this example, this is the case for the formation of the independent secondary circuits 32.

[0115] In Figure 15 A connection arrangement of five plate heat exchangers 1 is shown, which are arranged in alignment via connecting channels 3 and connection openings 4. This allows different flow paths to be realized through the plate heat exchangers 1. Connecting pieces 6 are present between the connection openings 4 but are not shown. The diversity of the circuit arrangements and the variety of peripheral connection options, which result from the connection arrangement and connection arrangement according to the invention, can be seen.

[0116] The connectors 6 can be designed in such a way that they are adapted to different connection systems on the connection side for the respective peripherals. Thus, the connectors 6 can be provided adapted to the connection systems of different manufacturers.

[0117] For static flow adjustment, the connecting piece 6 or the intermediate piece 10 can be partially or partially flowed through (not shown).

[0118] The connecting pieces 6 can be designed so that they extend into the connection opening 4. This prevents them from being displaced in a way that would cause leaks. For this purpose, the connecting pieces 6 have, for example, a concentric shoulder along their axial length (not shown).

[0119] Especially in the Figures 16a to 16eDifferent exemplary designs of connecting pieces 6 and clamping devices 9 are shown in detail in section. These designs can be used and combined as desired, independently of the previously described and shown embodiments. The combination of a specific connecting piece 6 in relation to the connection opening 4 and in relation to the clamping devices 9 shown thereon and their components, such as sheets 18 or plates 18, 23, screws 13 or threaded rods 13 with nuts 16 or cap nuts 17, are exemplary and in no way limited to the respective design shown. Rather, the clamping devices 9 and their components shown also represent examples. Other clamping devices 9 and their components that fulfill the function and purpose are also included.

[0120] Figure 16ashows, as an embodiment not according to the invention, an example of a sectional view of a connecting piece 6 in which the clamping device 9, comprising a threaded rod 13 and a nut 16, is arranged, wherein the threaded rod 13 is guided through a clamping web 24 with a bore 14.

[0121] The threaded rod 13 is guided through the, i.e. within the respective or another plate heat exchanger 1 to the opposite connecting piece 6 and can there also be guided through a clamping web 24 within a connecting piece 6 or directly through the connecting piece 6 and provided with a nut 16 or screwed and clamped to the clamping web 24 or the connecting piece 6, as shown in the Figures 6 , 7 and 13 is shown.

[0122] The connecting piece 6 includes a seal 15 at the end facing the outer plate 5 and rests on the surface of the outer plate 5 as a closure plate 5 or end plate 5. A branch 11 is also provided.

[0123] Figure 16b shows, by way of example, a sectional view of a connecting piece 6, in which the clamping device 9, comprising a plate 18, two threaded rods 13, and two nuts 16, is arranged, wherein the threaded rod 13 is guided through a bore 14 in the plate 18. The threaded rod 13, as a component of the clamping device 9, is guided around, i.e. outside, the respective or another plate heat exchanger 1.

[0124] The threaded rod 13 is guided through the opposite plate 18 or to the edge of an unopened outer plate 22 and is provided there with a nut 16 or with a fastening means 21, for example a suitable nut 16 and thus screws and clamps the connecting pieces 6, as shown in the Figures 1 to 4 and 13 shown, against the plate heat exchanger 1.

[0125] In this example, the plate 18 has an opening 34 through which the connecting piece 6 is inserted. At the plate heat exchanger-side end of the connecting piece 6 is a circumferentially extending flange-like projection 30, which is located between the plate 18 and the outer plate 5 when the connecting piece 6 is inserted or pushed through the opening 34, and against which the plate 18 presses during clamping.

[0126] The connecting piece 6 shown has on the front side, at the end facing the plate heat exchanger, a shoulder 28 which is reduced in the radial direction and projects into the connection opening 4.

[0127] In Figure 16c A connecting piece 6 is shown in a sectional view, which is arranged between two plate heat exchangers 1 and onto which two plates 18 are pushed as part of the clamping device 9. At one end on the plate heat exchanger side there is a flange 30, and at the other end on the plate heat exchanger side there is a snap ring 20 guided in a groove 19, which was inserted after both plates 18 were pushed onto the connecting piece 6. The clamping takes place as described above.

[0128] Alternatively, the opening 34 and the flange-like projection 30 have the complementary shape, for example, of a bayonet 35. As a result, the flange-like projections 30 are present on both ends of the respective connecting piece 6. The passage of the connecting piece 6 through the opening 34 is made possible by rotating the connecting piece 6. A corresponding plate 18 or a sheet 18 and corresponding connecting pieces are Figure 17 shown in plan view.

[0129] The Figure 16c The connecting piece 6 shown as a sectional view has on both end faces, at the respective plate heat exchanger end in the axial direction, a stepped cone 29 which projects into the respective connection opening 4 in the outer plate 5.

[0130] The connecting pieces 6 can be centered in the connection opening 4 with the shoulder 28 or the cone 29 projecting into the connection opening 4 or can be arranged in such a way that they can be moved with little play and yet lie tightly against or around the connection opening 4.

[0131] The connecting pieces 6 have, as in Figure 16d shown as a sectional view, for example an oversize compared to the connection opening 4, which is so large that a displacement of the connecting piece(s) 6 on the surface around the connection opening 4 to correct the position or to avoid stresses does not lead to leakage at the connection opening 4 and the seal 15 acts reliably.

[0132] As in Figure 16dAs shown, for example, a plate 18 as part of the clamping device 9 is pushed through the opening 34 onto the connecting piece 6. On the connecting piece 6, in the region of the plate heat exchanger-side end, a snap ring 20 is guided in a groove 19 against which the plate 18 rests.

[0133] The Figure 16e shows, as an embodiment not according to the invention, an example of a sectional view of a connecting piece 6 through which a threaded rod 13 is guided as part of the clamping device 9, wherein the threaded rod 13 is guided through a bore 14 at the essentially closed end opposite the plate heat exchanger end and is screwed to a cap nut 17 with a seal 15.

[0134] The connecting piece 6 can be clamped to or against the plate heat exchanger 1 as described above. For this purpose, the threaded rod 13 is guided through, i.e., within, the respective or other plate heat exchanger 1 to the opposite connecting piece 6, as described above.

[0135] The connecting piece 6 comprises a seal 15 at the end facing the outer plate 5 and rests on the surface of the outer plate 5 as a closure plate 5 or end plate 5. The end facing the plate heat exchanger has an axially projecting, reduced-diameter cylindrical shoulder 28, which merges into a cone 29.

[0136] Regardless of whether it has been shown or not, the connecting pieces 6 can have one or more branches 11. For simplicity, however, this has only been partially shown and depends on the required wiring of the plate heat exchangers 1 and their peripherals.

[0137] The connecting piece 6 and / or the intermediate piece 10 can also be arranged in any orientation around the alignment of the connecting channels 3 or the connection opening 4, i.e., around the flow direction axis, in order to achieve the best possible and simplest connection options for short connections with few components. The adaptation to the concentric connection opening 4 facilitates this.

[0138] In addition to the valves 7, as shown in the Figures 9, 10 and 12 shown, and the thread 8, as shown in the Figures 11 , 12 and 14As shown, the connecting piece 6 and / or the intermediate piece 10 may comprise a filter and / or a pump (not shown).

[0139] For simplification, two or more connectors 6 are designed as a connecting block or as a connecting assembly for two or more connection openings 4. This simplifies installation and allows for the integration of functions. The connecting block and the connecting assembly can be manufactured from injection molding, for example, from plastic or metal (not shown). Summary of reference symbols

[0140] 1 - Plate heat exchanger 2 - Heat exchanger plate 3 - Connecting channel 4 - Connection opening 5 - Outer plate, end plate, end plate 6 - Connecting piece, sealing disc 7 - Valve 8 - Thread 9 - Clamping device 10 - Intermediate piece 11 - Branch 12 - Internal thread 13 - Threaded rod, rod, screw 14 - Through hole, bore 15 - Seal 16 - Nut 17 - Cap nut 18 - Sheet, plate 19 - Groove 20 - Snap ring 21 - Fastening means 22 - Unopened outer plate 23 - Clamping plate 24 - Clamping web 25 - Blind plug, end piece 26 - Barrier wall, partition wall 27 - Flow direction 28 - Shoulder 29 - Cone 30 - Flange, rim, flange-like projection 31 -Primary volume flow 32 -Secondary circuit 33 -Heating circuit 34 -Opening 35 -Bayonet

Claims

1. Connection arrangement and linking arrangement with at least two plate heat exchangers (1), which are interconnected and that at least one of the plate heat exchangers (1) can be connected to at least one respective peripheral piping, whereby the plate heat exchangers (1) consist of soldered heat exchanger plates (2), which have connecting channels (3) running transversely to the heat exchanger plates (2) and in at least one outer plate (5) there are connection openings (4), that the plate heat exchangers are arranged as parallel and / or serial cascades, whereby on the surface around the respective connection opening (4) of at least one outer plate (5) at least one connector (6) is placed in alignment with at least one of the connection channels (3) or at least one of the connection openings (4), whereby at least one connector (6) is tensioned with or against at least one of the respective plate heat exchangers (1) by means of a clamping device (9) and that for connecting at least two plate heat exchangers (1) between the first and second or further plate heat exchanger (1) at least one additional connector (6) is arranged so that between the plate heat exchangers (1) in alignment with at least one of the connection channels (3) or at least one of the connection openings (4) of the plate heat exchangers (1) at least one additional connector (6) is arranged, whereby at least one additional connector (6) is placed on the surface around the connection opening (4) of the respective outer plate (5) of the plate heat exchangers (1) and is tensioned with or against at least one of the respective plate heat exchangers (1) by means of the clamping device (9) or an additional clamping device (9), whereby the clamping device (9) is arranged outside the respective plate heat exchanger (1), characterised in that the respective connector (6) is individually or as a group tensioned with or against one of the plate heat exchangers (1) with at least one clamping device (9) that encircles and / or engages behind the one of the plate heat exchangers (1) and / or at least one connector (6).

2. Arrangement according to claim 1, characterised in that at least one connector (6) is made in one piece or in multiple parts and / or that there is at least one spacer (10) between two connectors (6) or two connector parts (6).

3. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) or at least one spacer (10) is not or only partially or partially permeable.

4. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) protrudes into the connection opening (4) or is centred in the connection opening (4) and / or has an oversize relative to the connection opening (4).

5. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) and / or at least one spacer (10) has at least one branch (11).

6. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) and / or at least one spacer (10) has a barrier wall (26) and / or partition (26) transversely and / or longitudinally to the alignment of the connection channels.

7. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) and / or at least one spacer (10) can be arbitrarily rotated around the alignment of the connection channels (3) or around the connection opening (4).

8. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) and / or at least one spacer (10) and / or the branch (11) comprises a valve (7), a filter, a thread (8) and / or a pump.

9. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) is designed as an end piece (25) or as a blind closure piece (25).

10. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) and / or at least one spacer piece comprises at least one seal (15) and / or that the connector (6) is designed as a sealing washer (6).

11. Arrangement according to one of the preceding claims, characterised in that two or more connectors (6) are designed as a connection block or as a connection assembly for two or more connection openings (4).

12. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) is tensioned with the plate heat exchangers (1) as a package.

13. Arrangement according to one of the preceding claims, characterised in that the clamping device (9) is screwed or tensioned with at least one connector (6) and / or led through at least one connector (6).

14. Arrangement according to one of the preceding claims, characterised in that the clamping device (9) comprises at least sheets or plates (18, 23) and / or screws (13) or threaded rods (13) with nuts (16, 17).

15. Arrangement according to one of the preceding claims, characterised in that at least one connector (6) on the outer wall in the circumferential direction comprises at least partially at least one radial protrusion, for example in the form of a flange (30), a flanged protrusion (30), a bayonet (35), and / or a snap ring (20), led in a groove (19).