Heat exchanger unit and drainage channel body

Abstract

A heat exchanger unit (10) for heating fresh water with heat from drain water from a shower. The drainage flowing through the heat exchanger (2) flows through the drainage channel body (1). The flow distribution piece (3) forms the outer wall of the siphon and distributes drained water to the heat exchanger (2). The drainage channel body (1) has a long and thin shape. At least the drainage channel body (1) and / or the flow distribution piece (3) are / is made of plastic.

Description

Technical Field

[0001] This invention relates to the field of heat exchangers that heat fresh water by means of heat from drainage, particularly to showers or bathtubs, and also to a drain trough body for receiving elongated heat exchangers. Background Technology

[0002] WO2025 / 106362A1, also disclosed in US10,072,897B1, illustrates a heat exchanger unit for installation in a drainage system, such as the drainage system of a shower tray. This heat exchanger unit has an elongated heat exchanger along its length. This also requires the entire heat exchanger unit to have an elongated design. This, in turn, places special requirements on the sealing of the heat exchanger unit relative to adjacent elements of the shower tray, compared to common circular drain outlets or drain fittings.

[0003] KR20210020288A describes a heat recovery system. Wastewater is conveyed through a funnel-shaped container located above it to a pipe heat exchanger, which is made of plastic or synthetic resin.

[0004] EP2273223A1 describes a heat recovery system based on a plate heat exchanger. Warm wastewater from heating fresh water is delivered to the heat exchanger via a distribution device.

[0005] FR2986020A1 discloses a heat recovery system based on a tubular heat exchanger. Warm water flows through horizontally placed elements of the heat exchanger and transfers heat to fresh water.

[0006] NL1032458C1 describes a shower tray with heat recovery function, in which fresh water is guided through a metal pipe into a wash water drain tray and heated thereon. Summary of the Invention

[0007] According to a first aspect, one possible object of the present invention is to provide a heat exchanger unit that offers an alternative to conventional solutions, particularly being more economical and / or having improved efficiency and / or being easier to clean. The heat exchanger unit according to the first aspect of the invention achieves at least one of the above-mentioned objects.

[0008] According to a second aspect, one possible object of the present invention is to provide a drainage channel body that improves the connection with adjacent elements and / or provides new possibilities for installing heat exchanger units in buildings. The drainage channel body according to the second aspect of the present invention achieves at least one of the above-mentioned objects.

[0009] The first and second aspects of the present invention can be implemented independently of each other or in combination with each other.

[0010] According to the first aspect, there exists a heat exchanger unit with the following characteristics:

[0011] This heat exchanger unit specifically uses the heat from the drain water of a shower or bathtub to heat fresh water. It includes a drain tank body through which the drain water flows, at least one heat exchanger disposed within the drain tank body for connection to a fresh water supply mechanism, and a distribution element arranged for distributing the discharged drain water to the at least one heat exchanger, wherein the drain tank body is elongated. Here, the drain tank body and / or the distribution element are made of plastic.

[0012] This distribution element can form the outer wall of the siphon.

[0013] In an embodiment, the length of the distribution element is at least three times its width, particularly at least five times, and especially at least seven times.

[0014] "Elongated shape" should be understood as the shape of a heat exchanger unit, in which the maximum extension in the first direction (also called the longitudinal direction) of the heat exchanger (especially the cover frame) in its projection onto a horizontal plane is at least twice the extension perpendicular to the longitudinal direction (also called the transverse direction). The extension in the longitudinal direction is also called the length, and the extension in the transverse direction is called the width.

[0015] Here, and elsewhere in the text, the terms “horizontal” and “vertical” refer to the operating or installation status of the heat exchanger unit.

[0016] In this embodiment, the length of the drainage trough body is between 30 and 90 centimeters, and the width is between 5 and 15 centimeters.

[0017] Because the distribution components are made of plastic, low-cost manufacturing is possible. They also offer further advantages compared to metal components, such as corrosion resistance and a less environmentally conscious manufacturing process.

[0018] Because the distribution components are made of plastic, their geometry can be easily shaped compared to sheet metal components, resulting in a compact overall design.

[0019] In one embodiment, the distribution element includes an overflow portion for distributing discharged drainage to the at least one heat exchanger, wherein the overflow portion extends longitudinally along the distribution element and includes alternating grooves and protrusions located between the grooves along the longitudinal direction.

[0020] In particular, at least one of the following applies:

[0021] • The center-to-center distance between these grooves is 1 cm to 3 cm;

[0022] • In each case, at least ten grooves are arranged continuously along the overflow section at the same spacing.

[0023] Here, a water flow that is uniformly distributed along the longitudinal direction of the heat exchanger can be achieved.

[0024] In this embodiment, during heat exchanger unit operation, the drain water flows through the groove in a direction perpendicular to the longitudinal direction, hereinafter referred to as the flow direction. Viewed along the flow direction, the groove has a rounded cross-section.

[0025] In particular, at least one of the following applies:

[0026] • The groove has a depth of 1.5 mm to 5 mm, relative to the protrusion;

[0027] • Each groove includes a bottom that extends in a straight line along the flow direction at the deepest part of the groove, with a length of extension between 1 mm and 12 mm, especially between 2 mm and 8 mm, and even more especially between 2 mm and 5 mm;

[0028] • In particular, the bottom is inclined along the flow direction;

[0029] • In particular, the angle of inclination relative to the horizontal plane is between 10 and 30 degrees, especially between 15 and 25 degrees, and even more especially at least about 20 degrees.

[0030] This allows for uniform flow on both sides of the heat exchanger, regardless of whether the flow rate is low or high. The two sides of the heat exchanger correspond, for example, to the two sides of heat exchange tubes arranged vertically and extending longitudinally.

[0031] Because the distribution components are made of plastic, the shape of the grooves can be designed in virtually any style, with the goal of achieving optimal drainage flow characteristics. Drainage flows downstream along the flow direction at the bottom of the groove.

[0032] In one embodiment, the wall section connected to the overflow section is in a vertical state during the operation of the heat exchanger unit, and the drainage flows from the groove through the wall section and then to the operating heat exchanger.

[0033] After flowing through this wall section, the drain water passes through a set of horizontally arranged heat exchange tubes parallel to the overflow section and the longitudinal direction. This further helps to distribute the water flow to both sides of the heat exchanger. The lower edge of the wall section from which the water supply and drainage exit can be serrated.

[0034] In one embodiment, the distribution element includes support elements distributed along the longitudinal direction, and the distribution element is supported or suspended to the heat exchanger by the support elements.

[0035] In particular, the overflow area is achieved by supporting or suspending the pipes at the top of the heat exchanger with support elements.

[0036] In this way, the position of the overflow section relative to the heat exchanger is determined by the support element. The support element can resist deformation caused by water pressure inside the distribution section or by displacement of the heat exchanger. Such deformation or displacement disrupts the position of the overflow section above the heat exchanger, at least in the horizontal direction, and causes water to flow across one side of the heat exchanger.

[0037] In one embodiment, the heat exchanger unit includes: a reinforcing element, particularly a reinforcing profile, especially a reinforcing bracket, the reinforcing element being connected to the drain body to increase the strength of the drain body, wherein the reinforcing element is particularly made of metal.

[0038] Therefore, although the drain channel body can be made of plastic, it can still meet the shape accuracy requirements according to relevant standards under mechanical and thermal loads. In particular, this involves loads generated by vertical forces acting on the drain cover, and horizontal forces that could cause the drain channel body to widen and damage the seal. Such horizontal widening of the drain channel body can be prevented by reinforcing the support.

[0039] In this way, known heat exchanger units, which have so far been made of sheet metal, can be replaced because only sheet metal can achieve mechanical stability, which is essential for sealing between different components due to this slender design.

[0040] In the embodiments, the reinforcing element is formed as a profile element, such as a tubular profile, an L-shaped profile, an H-shaped profile, or a T-shaped profile, especially a profile with a vertical extension to withstand vertical forces.

[0041] In this embodiment, reinforcing elements are also provided, particularly reinforcing plates or reinforcing supports with vertically extending legs extending longitudinally along one or both sides of the drainage channel body. This enables high bending stiffness relative to moments about a horizontal axis in the transverse direction of the drainage channel body. Such displacement may occur when the drainage channel body is subjected to a vertical load in the middle.

[0042] In one embodiment, the additional reinforcing element extends below the drain body, for example by bending a reinforcing plate or reinforcing bracket at the lower end or extending it directly below the drain body.

[0043] In this embodiment, the reinforcing bracket is connected to the drainage trough body in a shape-fitting manner, which allows for relative displacement between the reinforcing bracket and the drainage trough body along the longitudinal direction of the drainage trough body.

[0044] In particular, the reinforcing bracket is connected to the drainage trough body via a snap-fit ​​connection.

[0045] Here, the reinforcing bracket can be integrated directly during the injection molding of the drain tank body, or installed immediately after injection molding. During this process, the reinforcing bracket helps the drain tank body maintain its shape during cooling. This relative displacement allows the drain tank body to shrink during cooling without creating stress between the drain tank body and the reinforcing bracket. Furthermore, this displacement also compensates for different amounts of expansion caused by temperature fluctuations during heat exchanger unit operation.

[0046] In one embodiment, the reinforcing bracket at least partially has an L-shaped profile.

[0047] In particular, it has horizontal support legs that extend continuously along the longitudinal direction of the drainage channel body, and

[0048] In particular, it has one or more vertical legs that are inserted into the corresponding recesses of the drain body.

[0049] Here, the vertical force acting on the drain cover or cover frame can be transmitted through the drain channel body to the horizontal support legs, which serve as reinforcement to resist horizontal offset movement. The vertical support legs are responsible for transmitting the force from the edge of the drain channel body to the reinforcing bracket.

[0050] In one embodiment, the heat exchanger unit includes at least one support element arranged within the joint area of ​​the heat exchanger and located outside the drain tank body, forming a support surface for receiving vertically downward forces.

[0051] In particular, at least one of the support elements forms part of the reinforcing bracket.

[0052] Therefore, the at least one support element is integrally formed with the reinforcing bracket. Here, the support element may include force dissipation sections extending vertically downward from the support surface. In particular, these sections are integrally formed with the support surface.

[0053] In one embodiment, the heat exchanger unit forms a funnel extending from above into the distribution element. This funnel is elongated and shaft-shaped, forming a siphon with the distribution element.

[0054] In particular, the funnel is made of plastic, and

[0055] In particular, at least one sidewall of the funnel includes ribs or is corrugated.

[0056] This allows for the reinforcement of the sidewall, preventing it from being sucked onto the distribution element by the drainage flow. Furthermore, if the sidewall faces the overflow section, its corrugated shape ensures that spheres of a specific diameter can pass through the siphon within the funnel itself and in the section between the funnel and the overflow section—a requirement of certain standards—while simultaneously requiring less space in the lateral direction.

[0057] In one embodiment, the inlet area of ​​the funnel is provided with a retaining element for intercepting contaminants, wherein the retaining element reinforces the funnel to resist external forces acting on the funnel in the horizontal direction.

[0058] In particular, the retaining element is a perforated metal plate or a perforated plate.

[0059] In particular, the inner side of the funnel includes a protruding engaging element to engage the retaining element into the funnel.

[0060] This stabilizes the shape of the funnel, thereby maintaining pressure on the seal. Furthermore, it traps contaminants, especially hair. This prevents contaminants from accumulating in the overflow section or heat exchanger, thus avoiding disruption of the uniform water flow through the heat exchanger.

[0061] In one embodiment, the retaining element includes, on its upper side, a perforated region having a through hole for water to pass through and for intercepting residue, and at least one collection region at a lower position for collecting the intercepted residue, wherein, in particular, at least one collection region is substantially non-perforated, except optionally with a small drain hole.

[0062] Here, dirt can be effectively intercepted and collected within the collection area, preventing clogging of the through holes. The drain holes do not participate in the total drainage flow; they are only used to dry the collection area. Their diameter is, for example, 2 to 5 millimeters.

[0063] In one embodiment, the retaining element is inserted into a groove or channel extending along the inner side of the funnel and in the longitudinal direction of the funnel. This allows for stable positioning of the retaining element within the funnel and / or supports the funnel against widening caused by internal water pressure.

[0064] In an embodiment, the heat exchanger unit includes a circumferential funnel seal disposed between the funnel and the drain tank body for sealing the drain area of ​​the heat exchanger unit, wherein the funnel seal is compressed in the horizontal direction, and wherein, in particular, at least one of the following applies:

[0065] • The funnel is inserted into the drain tank body via a snap-fit ​​connection, wherein the funnel seal deforms upon insertion and, in this embodiment, engages with a protrusion on the drain tank body, thereby forming part of the snap-fit ​​connection;

[0066] • The funnel is inserted into the drain trough body via a snap-fit ​​connection. The funnel deforms upon insertion and, in this embodiment, engages with a protrusion on the drain trough body, thus forming part of the snap-fit ​​connection.

[0067] Funnel seals are typically located in the upper region of the funnel.

[0068] Here, a compact structural design for the heat exchanger unit can be achieved: the horizontal compression of the funnel seal means that it is arranged between the essentially vertical section inside the drain trough body and the outer periphery of the funnel. Therefore, there is no need to set a horizontal section between these two elements, which would result in horizontal space requirements.

[0069] In one embodiment, the heat exchanger unit includes a top cover frame having a vertical frame wall extending along the longitudinal direction of the heat exchanger unit, wherein a snap-fit ​​connection for securing the cover frame to the drain tank body is formed between the inner side of the frame wall and the outer side of the drain tank body.

[0070] In particular, a circumferential frame seal is arranged between the cover frame and the drainage channel body.

[0071] This allows for a space-saving design of the heat exchanger unit, especially in the lateral direction. The frame seals prevent drainage from the heat exchanger unit from flowing into the adjacent building structure.

[0072] In one embodiment, the heat exchanger unit includes a piping connector for connecting a new water pipe to the heat exchanger. This piping connector has, in particular, metal-supported fittings, wherein each fitting is connected to a drain tank body via form-fitting teeth that prevent rotation of the fitting relative to the drain tank body.

[0073] In particular, the shape of the connector and the drainage channel body means that the connector can only be assembled in one rotational position relative to the drainage channel body.

[0074] This is achieved, in particular, through the asymmetrical shape of the teeth.

[0075] Here, the force generated when the pipe is screwed into the fitting can be transmitted to the drain tank body. Restricting to a single rotational position ensures proper assembly of the fitting within the drain tank body. Correct orientation is crucial so that the heat exchanger's asymmetrical connecting elements align with the fitting when the heat exchanger is inserted into the drain tank body.

[0076] The toothed part can be formed by an internal spline or internal multi-tooth structure on the drainage channel body, and an external spline or external multi-tooth structure with a corresponding shape on the connector.

[0077] According to the second aspect, a drainage channel body with the following characteristics is provided:

[0078] In particular, the drain trough body is adapted to the aforementioned heat exchanger unit. The drain trough body is used for supplying and draining water, and for receiving an elongated heat exchanger for connection to a fresh water supply; wherein the drain trough body is elongated in shape.

[0079] The drainage trough body is used for a watertight connection to the base plate. To this end, the drainage trough body includes a connecting frame. In the working state of the drainage trough body, the connecting frame is pressed against the drainage trough body by at least one clamping mechanism, and in the process, an external seal is formed between the drainage trough body and its surrounding environment.

[0080] Here, despite the elongated shape of the drainage channel body, a reliable seal between the drainage channel body and its surrounding environment can still be achieved in the assembled state. The external seal can seal the drainage channel body relative to the surrounding environment, regardless of the specific shape of the base plate. The combination of the connecting frame and the external seal can compensate for irregularities in the shape of the base plate or shape changes of the base plate during operation, ensuring that these factors do not compromise the seal.

[0081] Because the drain tank body has a long and narrow opening, the long and narrow heat exchanger can be inserted after the drain tank body is assembled, and the heat exchanger can be removed for inspection or replacement in the future.

[0082] Here, a method for assembling a heat exchanger unit is provided, which includes the following steps in sequence: first, placing a drain tank body containing the heat exchanger; then, assembling a new water pipe and a drain pipe on the drain tank body and checking the sealing as much as possible; next, completing the installation of the drain tank body, for example by building a wall; and then placing a base plate and achieving a seal between the base plate and the drain tank body.

[0083] In an embodiment, during operation, the external seal forms a seal between the drain trough body and the base plate.

[0084] Here, the clamping mechanism can pull the base plate toward the external seal, thereby ensuring a tight seal.

[0085] In an embodiment, during operation, the external seal forms a seal between the drainage trough body and the connecting frame, wherein there is a watertight coupling connection between the connecting frame and the base plate.

[0086] In this embodiment, the connecting frame is fixedly connected to the base plate, particularly by adhesive bonding. Here, the connecting frame stabilizes the shape of the base plate.

[0087] In one embodiment, at least one clamping mechanism pulls the connecting frame toward the drain body, particularly toward the drain body flange surrounding the frame, and especially along the direction of the reinforcing support of the drain body.

[0088] In one embodiment, this is achieved by screws passing through the connecting frame and screwed into the bushing, which in turn is fixed to the reinforcing bracket.

[0089] In one embodiment, one, two or more clamping mechanisms are arranged along each longitudinal side of the drainage channel body.

[0090] In this embodiment, the clamping mechanism is arranged only on the end face of the drainage trough body, and not on its longitudinal side.

[0091] This allows for a slim design of the drainage channel body. The rigidity of both the drainage channel body and the connecting frame is high enough to ensure a tight seal between them.

[0092] In an embodiment, the drain body includes reinforcing elements, particularly reinforcing profiles, especially reinforcing supports, which are connected to the drain body to enhance its rigidity, wherein the reinforcing elements are particularly made of metal.

[0093] These reinforcing elements can be designed according to the heat exchanger unit described in the first aspect. Alternatively, the reinforcing elements described above, particularly reinforcing supports, can also be provided.

[0094] In one embodiment, the connecting frame includes reinforcing elements or reinforcing segments for increasing stiffness in the vertical direction.

[0095] The vertical stiffness relates to the rotational stiffness of the drainage channel body when rotating about a horizontal transverse axis, which is perpendicular to the longitudinal axis.

[0096] For example, the connecting frame can be constructed from profile elements with vertical extensions for reinforcement. The profile elements can be formed into profile shapes by reshaping or extruding sheet metal.

[0097] In this embodiment, the connecting frame is made of stainless steel.

[0098] In one embodiment, the drain tank body includes a connector for connecting a new water pipe and a heat exchanger arranged within the drain tank body for introducing and drawing new water through the side wall of the drain tank body.

[0099] As a manifestation of the second aspect, a connecting frame with the following characteristics can be provided: a connecting frame, particularly suitable for the aforementioned drainage trough body,

[0100] • Includes profiles extending along the outer perimeter of a slender rectangle,

[0101] • The profile includes, on its upper side, a channel for receiving the edge of the base plate and a sealant for sealing the base plate relative to the connecting frame.

[0102] • The profile includes reinforcing elements or reinforcing sections that extend along the longitudinal side of the connecting frame to increase vertical stiffness.

[0103] Other preferred embodiments can be found in the dependent patent claims. Attached Figure Description

[0104] The subject matter of the invention is explained in more detail below with reference to the preferred embodiments shown in the accompanying drawings. The schematic diagrams include:

[0105] Figures 1-2 These are exploded and cross-sectional views of the heat exchanger unit;

[0106] Figures 3-4 It is a variant that seals the gap between the drain body and the funnel;

[0107] Figure 5 , Figure 6a and Figure 6b Details of the overflow section embodiment and flow distribution components;

[0108] Figure 7 This is a cross-sectional view of the drainage trough body in the joint area;

[0109] Figure 8 This is an exploded view of the connector;

[0110] Figure 9 It is a variant of the reinforced stent;

[0111] Figures 10-11 These are different embodiments of the support element;

[0112] Figures 12a-12b It is the connection between the cover frame and the drainage ditch body;

[0113] Figures 13a-13c Details of the perforated plate and its connection to the funnel;

[0114] Figure 14 Connection between the drain trough body and the thick base plate of the shower basin;

[0115] Figure 15 Connection between the drain trough body and the thin base plate of the shower basin;

[0116] Figure 16 yes Figure 15 Longitudinal cross-sectional view of the end region of the design; and

[0117] Figure 17 yes Figure 16 Exploded view of each component.

[0118] The reference numerals used in the accompanying drawings and their meanings are listed in the reference numeral list. Basically, the same reference numerals are used for the same parts in all drawings. Detailed Implementation

[0119] Figures 1-2 An exploded view and a cross-sectional view of the heat exchanger unit 10 are shown. The heat exchanger unit 10 includes the following components:

[0120] The drain tank body 1 guides water from the inlet area 11 through the heat exchanger unit 10 to the drain area 12, and then into the drain pipe 13 before flowing into a water pipe (not shown). The drain tank body 1 houses or supports other components and positions them relative to each other. Here, the positioning must remain stable despite being subjected to mechanical and thermal alternating loads, especially to ensure a tight seal against drainage and sewer gas.

[0121] Heat exchanger 2, through which fresh water flows and warm wastewater flows from heat exchanger 2 during operation of heat exchanger unit 10.

[0122] The distribution element 3 forms the outer wall of the siphon tube on one hand and evenly distributes the drainage along the heat exchanger 2 on the other. Here, the drainage flows through the overflow section 31 to the uppermost pipe and then flows through the other pipes of the heat exchanger 2. In embodiments not shown, the distribution element 3 is only used to distribute the drainage and does not form the outer wall of the siphon tube. In such embodiments, the funnel 4 described below may also be omitted.

[0123] The funnel 4 forms the internal portion of the siphon, guiding drainage from the inlet area 11 to the distribution element 3. The funnel 4 is sealed relative to the inner wall of the drainage tank body 1 by a funnel seal 45, preventing sewer gas from escaping from the drainage area 12 into the inlet area 11 and subsequently into the surrounding environment. The funnel 4 includes a circumferential flange 43, with the funnel seal 45 disposed in the region of its flange edge 44.

[0124] The perforated plate 5 provides mechanical reinforcement to the funnel 4, particularly enabling the establishment of clamping pressure at the funnel seal 45 between the funnel 4 and the drain body 1, especially in the horizontal direction. On the other hand, the perforated plate 5 acts as a filter to block contaminants, especially hair, in the drain.

[0125] The cover frame 6 and the drain cover 7 form the visible portion of the heat exchanger unit 10. For example, they are made of stainless steel. The cover frame 6 is sealed relative to the upper edge 14 of the drain body by a frame seal 65. The drain cover 7 includes a through-hole through which drainage flows into the inlet area 11 while blocking contaminants. For example, the drain cover 7 may be designed as a flat plate with a circular hole or groove.

[0126] A reinforcing bracket 8, made of metal, particularly steel, reinforces the drainage body 1 along its longitudinal direction, enhancing its resistance to vertical and / or horizontal forces. This, in particular, stabilizes the shape of the upper edge 14 of the drainage body under mechanical and thermal loads. In this way, the sealing function of the funnel seal 45 and / or the frame seal 65 is ensured. The reinforcing bracket 8 can be pushed into the drainage body 1 from below and secured. Upon insertion, the vertically extending reinforcing section 82 of the reinforcing bracket 8 is pushed into a corresponding downward-opening groove in the edge 14 of the drainage body. The horizontally extending longitudinal section 81 of the reinforcing bracket 8 extends along the length of the drainage body 1. The longitudinal section 81 bears the vertically downward force acting on the edge 14 of the drainage body, and at least part of the force is transmitted horizontally through the drainage body flange 15 located on the longitudinal section 81, thereby supporting the entire drainage body 1. The reinforcing bracket 8 includes a fastening groove 83 that engages with the snap-fit ​​connector 18 of the drainage body flange 15, but allows for displacement relative to each other in the longitudinal direction.

[0127] The connector 9, for example made of copper-zinc alloy, forms a channel for fresh water to enter and exit the heat exchanger 2 and forms a corresponding connection on the outside of the drain tank body 1 and the inside of the heat exchanger 2.

[0128] In summary, considering the functions of the aforementioned components, the drainage tank body must necessarily include an inlet area 11, a siphon pipe, and a drainage area 12. During heat exchanger 2 operation, drainage flows through these areas in this order. Here, the inlet area 11 exchanges air with the surrounding environment above the heat exchanger unit 10, and the drainage area 12 exchanges air with the drain pipe 13 used to connect to the sewage system. The siphon pipe area prevents air exchange between the inlet and drainage areas while allowing fluid to flow from the inlet area to the drainage area. The bottom of the siphon pipe area is defined by a distribution member 3, which forms an overflow section 31. The outflowing drainage is blocked by the overflow section 31 and distributed to at least one heat exchanger 2.

[0129] Figures 3-4 A variation of the seal between the drain body and the funnel is shown. In both cases, the funnel seal 45 is arranged between the drain body 1 and the funnel 4, and is generally compressed in the horizontal direction. The funnel seal 45 may completely surround the inside of the edge 14 of the funnel 4 or the drain body. Here, the heat exchanger unit 10 can achieve a space-saving design in the width direction. Figure 3 The funnel seal 45 is designed in a contour shape, and its specific shape allows it to snap into the notch inside the edge 14 of the drainage trough body, thus forming a snap-fit ​​connection with the edge 14 of the drainage trough body. According to Figure 4The flange edge 44 on the circumferential flange 43 of the funnel is designed at least in certain locations to form a snap-fit ​​element 46, which engages with a correspondingly shaped element inside the edge 14 of the drain body. For example, the snap-fit ​​element 46 is a notch on the funnel, while the element is a corresponding protrusion on the edge 14 of the drain body, or vice versa. This design clearly indicates to the user that the funnel 4 is engaged with the drain body 1 through the engagement of the snap-fit ​​element 46.

[0130] Figure 5 Figure 6 and Figure 6a The diagram shows a distribution member 3 with an overflow portion 31 and details of the overflow portion 31. The distribution member 3 can be made of metal or plastic. If plastic is chosen, the shape of the overflow portion 31 can be freely designed. This allows for optimized distribution of drainage across the heat exchanger 2 at different flow rates. In an embodiment, the overflow portion 31 includes a row of grooves 32 with protrusions between them. Because the grooves 32 have a rounded cross-section (in projection parallel to the flow direction of the drainage through the overflow portion 31) and a certain length d along the flow direction, uniform distribution of drainage along the heat exchanger 2 can be achieved regardless of whether the flow rate is low or high. The length d is preferably between 1 mm and 12 mm, particularly between 2 mm and 8 mm, and especially between 2 mm and 5 mm.

[0131] exist Figure 5 and Figure 6a In this embodiment, the groove 32, viewed along the flow direction, extends only in the overflow portion 31 region. Figure 6b In one embodiment, the groove located after the overflow section 31 extends further along a section of the distribution member 3—preferably extending substantially vertically downwards in the operating state of the distribution member.

[0132] In one embodiment, the flow distribution element 3 is made of a metal plate. The overflow portion 31 may include cutouts distributed along the longitudinal direction of the overflow portion 31. Alternatively, the overflow portion 31 may include a horizontal section where drainage is blocked and the horizontal section includes a row of holes arranged longitudinally above the heat exchanger 2.

[0133] In this embodiment, the distribution element 3 is injection molded from plastic, such as polypropylene. In this embodiment, 30 to 50 grooves 32, particularly 35 to 45, and especially at least about 40, are provided along a length of 50 to 70 centimeters. The minimum distance between the grooves 32 is particularly 10 or 15 millimeters. These grooves distribute a corresponding number of fine water flows to the uppermost pipe of the heat exchanger 2, thereby reliably achieving good start-up performance and high efficiency.

[0134] The distribution element 3 includes support elements 33 distributed at intervals of 10 to 20 cm along the longitudinal direction of the heat exchanger 2. The support elements 33 support the overflow portion 31 on the heat exchanger 2, thereby defining the position of the overflow portion 31 relative to the uppermost pipe of the heat exchanger 2. One or more support elements 33 can form a suspension structure of the distribution element 3 on the heat exchanger 2, especially on the uppermost pipe of the heat exchanger 2. Thus, even if the heat exchanger 2 moves, for example, due to thermal expansion, the position of the overflow portion 31 relative to the heat exchanger 2 remains unchanged. For a solid distribution element 3, the support elements 33 prevent deformation of the overflow portion 31, especially if the distribution element 3 is made of plastic.

[0135] Figure 7 The cross-section of the drainage channel body in the joint area is shown. Figure 8 An exploded view of the fitting area is shown. Fitting 9 guides cold, fresh water through the drain body 1 to the heat exchanger 2 and then discharges it. Fitting 9 is pushed inward through a hole in the drain body 1 and secured by a nut and retaining plate 93. An O-ring 91 seals between the heat exchanger 2 and fitting 9. Fitting 9 can always only be assembled in one position because the connection of the heat exchanger 2 is not rotationally symmetrical, for example, due to its inclusion of an opening for receiving a retaining element that passes through the connection of the heat exchanger and through fitting 9. The rotational locking assembly of fitting 9 is achieved through an irregular external polygonal socket between fitting 9 and the drain body 1, also referred to herein as teeth 92. In this way, fitting 9 can be assembled in only one position, rotating relative to its longitudinal axis. Another function of this external polygonal socket or teeth 92 is that it allows for the transmission of greater torque when a strong installer tightens the threads between the pipe and fitting 9 for connecting the cold water pipe. The fixed plate 93 may include a protrusion 94 that bends upward after the nut 95 is tightened, and forms a rotation lock on the outer hexagon of the nut 95.

[0136] Figure 9 A variation of the heat exchanger unit 10, including the reinforcing support 8, is shown from below. Only its longitudinal section 81 is visible here. This section reinforces the heat exchanger unit 10 in the horizontal plane. In addition to the aforementioned components, a sealing felt 89 is also shown, which forms a watertight transition with the surrounding masonry and / or floor covering / subfloor when the heat exchanger unit 10 is assembled.

[0137] Figures 10-11 Different embodiments of the support element 85 are shown. If the mortar cover on the cold water pipe at the joint 9 or even on the drain pipe at the edge 14 of the drain body is too thin, the mortar may crack, which could cause the sealing felt 89 on the mortar layer to crack. The support elements 85 can exist as a protective measure, and these support elements can be separate components or integrally formed on one or two reinforcing supports 8. Figure 10 In one embodiment, the support element 85 protrudes far beyond the joint member 9, thereby being supported on the mortar (not shown, located below the sealing felt 89), thus protecting the sealing felt 89 from loads and / or movements that could cause it to tear. Figure 11 In one embodiment, a support element 85 is integrally formed on the longitudinal section 81 of the reinforcing bracket 8, and optionally, a support foot for supporting a portion of the building is also integrally formed.

[0138] Figure 12a and Figure 12b The connection between the cover frame 6 and the drain body 1 is shown. The drain body edge 14 includes snap-fit ​​elements that form snap-fit ​​connections with corresponding frame snap-fit ​​elements 66 of the cover frame 6, distributed along the periphery of the drain body edge 14. For example, there is one snap-fit ​​connection every 8 to 30 centimeters on average along the periphery. For example, there are 4 to 10 such snap-fit ​​connections along the entire periphery. Optionally, frame guide elements 67 are also provided, arranged along the periphery between the visible snap-fit ​​connections. The frame guide elements 67 center the cover frame when it is placed and snapped into the drain body 1. Subsequently, they reinforce the mutual fixation of the drain body edge 14 and the cover frame 6 in the horizontal direction. Since the frame guide elements 67 are located between the snap-fit ​​connections with the frame snap-fit ​​elements 66, they allow a certain degree of offset movement between the snap-fit ​​elements of the drain body edge 14 and the cover frame 6.

[0139] Figures 13a to 13c Details of the perforated plate 5 and its connection to the funnel 4 are shown in different embodiments. The perforated plate 5 enhances the funnel 4's resistance to lateral compression, especially if the funnel 4 is made of plastic. This allows pressure to be established on the funnel seal 45 in the horizontal direction. The perforated plate 5 includes a through-hole 52 through which drainage flows while contaminants are trapped internally. Contaminants can be collected in at least one low-lying collection area 53 without the through-hole 52, without clogging the through-hole 52. Figure 13a The collection area 53 may include a drain hole 54, which has no significant effect on the flow of drainage, but empties the collection area 53 when there is no drainage flow.

[0140] The typical diameter of the through hole 52 is, for example, 3 to 15 mm, especially 5 to 10 mm. The typical diameter of the drain hole 54 is, for example, 2 to 5 mm.

[0141] The perforated plate 5 and the funnel 4 may be provided with corresponding elements forming a snap-fit ​​connection. In particular, the funnel 4 may include recessed channels or grooves in the longitudinal direction into which the edge of the perforated plate 5 can be inserted. For example, the funnel 4 is provided with a horizontal retaining groove 48 extending in the longitudinal direction, into which the horizontally extending legs of the perforated plate 5 are inserted, wherein the vertically extending legs on opposite sides of the perforated plate 5 are pressed against the opposing inner walls of the funnel 4. Figure 13b The legs, extending roughly horizontally and slightly at an angle, are located on a similarly angled section of the funnel 4 leading into its interior, while the vertically extending legs have a minimum length to prevent the perforated plate 5 from rotating and sliding into the funnel 4. Alternatively, the funnel 4 has longitudinally extending vertical retaining grooves 49 on its opposite inner sides, into which the downward-pointing vertical legs of the perforated plate 5 are inserted. Figure 13c Thus, the perforated plate 5 holds the sidewalls of the funnel 4 together and prevents it from widening. Horizontal or vertical grooves can be formed on the funnel 4. Figure 13b and Figure 13c Different variations of the retaining groove can be used with... Figure 13a , Figure 13b or Figure 13c Five combinations of different forms of perforated plates.

[0142] Figures 14 to 16 Different embodiments of the connection between the drain body 1 and the base plate 100 are shown. The base plate 100 can be the base of a shower basin, bathtub, shower, or other surface requiring drainage. Different advantageous designs can be derived depending on the type and thickness of the base plate 100. A common feature of these designs is that a reliable seal can still be achieved between the drain body 1 and the base plate 100 despite the elongated shape of the heat exchanger unit 10. Optionally, the heat exchanger unit 10 stabilizes the shape of the base plate 100. Thus, the heat exchanger unit 10 supports the base plate 100. Here, the base plate 100 can be clamped onto the heat exchanger unit 10. The connection between the heat exchanger unit 10 and the base plate 100 can be reversible.

[0143] Figure 14 The connection between the drainage trough body 1 and the relatively thick base plate 100 is shown. For example, the base plate 100 is made of mineral material. The connection is achieved through a connecting frame 101.

[0144] After assembly onto the drain body 1, the connecting frame 101, located above the drain body flange 15, is clamped to the drain body 1 by a clamping mechanism 103, particularly to the reinforcing bracket 8. This is achieved, for example, by a screw 1032 passing through the connecting frame 101 and screwed onto a bushing 1031, which in turn is fixed to the reinforcing bracket 8. The clamping mechanism 103 clamps the base plate 100 onto an external seal 102, which forms a seal between the base plate 100 and the drain body 1, particularly between the drain body edge 14 and / or the drain body flange 15. The external seal 102 prevents drainage from entering the structure above the base plate 100. The connecting frame 101 may press against a circumferential frame seal 65 on the upper side of the drain body edge 14 to prevent drainage from flowing out between these components.

[0145] Sealing rings 1033 are provided around the bushing 1031 between the drain body flange 15 and the longitudinal section 81. They prevent drainage from passing through the bushing 1031 between the drain body flange 15 and the longitudinal section 81. The drain cover 7 covers the connecting frame 101 and the screws 1031.

[0146] The clamping mechanisms 103 can be arranged at regular intervals along the two longitudinal sides of the heat exchanger unit 10. For example, one clamping mechanism 103 can be provided every 5 to 30 centimeters.

[0147] Through this clamping along the longitudinal side, the base plate 100 is reliably pressed against the reinforcing bracket 8 and sealed along the longitudinal side. The sealing of the transverse side is not critical due to its shorter length.

[0148] Figure 15 The connection between the drain body and the relatively thin base plate of the shower basin is shown. For example, the base plate 100 is made of enamel steel or a composite material, such as a combination of plastic and / or mineral materials and / or glass fiber. The plastic may be, for example, acrylic or thermoplastic.

[0149] A self-reinforcing connecting frame 101 extends along the upper periphery of the heat exchanger unit 10 and forms a connection with the base plate 100. The base plate 100 is sealed relative to the connecting frame 101 along its inner edge facing the heat exchanger unit 10 by sealant 1034. In particular, the sealant 1034 also acts as an adhesive. Here, the edge can be inserted into a circumferential channel of the connecting frame 101. To reinforce the connecting frame 101 in the vertical direction, if it is made of remolded sheet metal, it may also include one or more vertical extensions. The connecting frame 101 can be attached or joined to the base plate 100 after factory manufacturing. The connecting frame 101 then helps to reinforce the base plate 100. A reinforcing bracket 8 can be placed on the structural body, such as a plate or beam.

[0150] After assembly onto the drain body 1, the connecting frame 101, located above the flange 15 of the drain body, is clamped onto the drain body 1 by a clamping mechanism 103, particularly onto the reinforcing bracket 8. This is achieved, for example, by screwing a screw 1032 through the connecting frame 101 and into a bushing 1031, which in turn is secured to the reinforcing bracket 8. The clamping mechanism 103 clamps the connecting frame 101 onto the drain body 1, particularly onto the drain body edge 14 and / or the drain body flange 15. Here, an external seal 102 forms a seal between the connecting frame 101 and the drain body 1, particularly between the drain body edge 14 and / or the drain body flange 15. Here, a watertight connection exists between the connecting frame 101 and the base plate 100. The external seal 102 prevents drainage from entering the structure below the base plate 100. The connecting frame 101 can press against the circumferential frame seal 65 on the upper side of the drain body edge 14 to prevent drainage from flowing out between these elements.

[0151] The drain cover 7 covers the connecting frame 101 and screws 1032. It may include reinforcing ribs and / or be laterally located in a specific position.

[0152] Here, by reinforcing the reinforcing brackets 8 with additional reinforcing brackets 86, particularly those with vertically extending legs, they achieve higher bending stiffness against vertical forces. The reinforcing brackets 86 include horizontal and vertical legs, with the horizontal legs of the corresponding reinforcing bracket 8 resting on these legs, and the vertical legs extending downwards along the sidewall of the drain tank body 1. In one or both reinforcing brackets 86, the vertical legs may optionally be bent at their lower ends and extend horizontally below the drain tank body 1. This allows for the application of forces between the connecting frame 101 and the drain tank body 1, particularly between the connecting frame 101 and the drain tank body flange 15, along the entire length of the heat exchanger unit 10. These forces are crucial for sealing. Therefore, the clamping mechanism 103 can be arranged only on the lateral sides of the heat exchanger unit 10, while still ensuring that the external seal 102 is reliably clamped between the connecting frame 10 and the connecting frame 101 or the drain tank body flange 15 along the entire length of the heat exchanger unit 10. Therefore, the heat exchanger unit 10 can be designed to be particularly slender.

[0153] Figure 16 It shows Figure 15 The longitudinal section of the designed end region, Figure 17An exploded view of the components is shown. A clamping mechanism 103 is provided at each end of the heat exchanger unit 10. This clamping mechanism 103 pulls the connecting frame 101 toward the drain body 1 or the drain body flange 15, thereby compressing the external seal 102 along the entire length of the heat exchanger unit 10. Only in the end region does the clamping mechanism 103 protrude below the connecting frame 101 and the base plate 100. For example, the clamping mechanism 103 connects the connecting frame 101 to a bushing 1031 fixed to the longitudinal section 81 via screws 1032. The drain cover 7 can be placed on the screws of the clamping mechanism 103.

[0154] The common feature of the above embodiments is that the drain trough body 1 can be assembled in the building first, new water pipes can be connected, and the sealing performance can be tested after the heat exchanger 2 is inserted, before installing, for example, a shower surface with a base plate 10. Afterwards, while the heat exchanger unit 10 is in operation, the heat exchanger 2 can be removed from the heat exchanger unit 10 for maintenance or replacement. For this purpose, the drain trough body 1 can be opened and closed reversibly, i.e., it can be operated without damage.

[0155] The heat exchanger units disclosed in the above embodiments all have a heat exchanger with a row of vertically arranged heat exchange tubes. In principle, the present invention can also be implemented with other heat exchangers, such as heat exchangers with two or more rows of vertically arranged heat exchange tubes, or heat exchangers with heat exchange tubes arranged in a staggered manner. In particular, the heat exchanger can be as described in WO2015 / 106362A1 or US10,072,897B1 mentioned above. Multiple heat exchangers can also be arranged sequentially in the same drain tank body along the transverse and / or longitudinal directions.

Claims

1. A heat exchanger unit (10) for heating fresh water, particularly using the heat from the drain of a shower or bathtub, comprising: A drainage trough body (1) for draining water; at least one heat exchanger (2) disposed within the drainage trough body (1) and for connection to a fresh water supply mechanism; a distribution element (3) for distributing the outflowing drainage to the at least one heat exchanger (2), wherein the drainage trough body (1) has an elongated shape, and in particular wherein the distribution element (3) forms the outer wall of a siphon, characterized in that, The drainage trough body (1) is made of plastic. And / or the distribution element (3) is made of plastic.

2. The heat exchanger unit (10) according to claim 1, wherein, The length of the distributor (3) is at least three times, particularly at least five times, and especially at least seven times its width.

3. The heat exchanger unit (10) according to any one of the preceding claims, wherein, The distribution element (3) includes an overflow portion (31) for dispersing the outflowing drainage to the at least one heat exchanger (2), wherein the overflow portion (31) extends longitudinally along the distribution element (3) and includes a plurality of alternately arranged grooves (32) and protrusions located between these grooves (32) in the longitudinal direction. In particular, at least one of the following applies: • The center-to-center spacing of these grooves (32) is 1 cm to 3 cm; • At least ten of the grooves (32) are arranged continuously at the same spacing along the overflow portion (31).

4. The heat exchanger unit (10) according to claim 3, wherein, When the heat exchanger unit (10) is in operation, drainage flows through the groove (32) in a direction perpendicular to the longitudinal direction, referred to as the flow direction, and the groove (32) has a rounded cross-section when viewed along the flow direction. In particular, at least one of the following applies: • The groove (32) has a depth of 1.5 mm to 5 mm relative to the protrusion; • Each of the grooves (32) includes a bottom that extends in a straight line along the flow direction at the deepest point of the groove, particularly in a length between 1 mm and 12 mm, especially between 2 mm and 8 mm, and even more particularly between 2 mm and 5 mm; • In particular, the bottom is inclined toward the flow direction; • In particular, the angle of inclination relative to the horizontal plane is between 10 and 30 degrees, especially between 15 and 25 degrees, and even more especially at least about 20 degrees.

5. The heat exchanger unit (10) according to claim 3 or 4, wherein, It also includes a wall section connected to the overflow section and through which drainage flows from the groove (32) to the operating heat exchanger (2), wherein the wall section extends vertically during the operation of the heat exchanger unit (2).

6. The heat exchanger unit (10) according to claim 3, 4 or 5, wherein, The distribution element (3) includes support elements (33) distributed along the longitudinal direction, and the distribution element (3) is supported or suspended to the heat exchanger (2) by the support elements (33). In particular, in the area of ​​the overflow section (31), the pipe at the top of the heat exchanger (2) is supported or suspended by the support element (33).

7. The heat exchanger unit (10) according to any one of the preceding claims, comprising reinforcing elements, particularly reinforcing profiles, especially reinforcing supports (8), the reinforcing elements being connected to the drain tank body (1) to reinforce the drain tank body (1), wherein, The reinforcing element is specifically made of metal.

8. The heat exchanger unit (10) according to claim 7, wherein, The reinforcing bracket (8) is shaped to fit the drainage trough body (1) and allows for relative displacement between the reinforcing bracket (8) and the drainage trough body (1) along the longitudinal direction of the drainage trough body (1). In particular, the reinforcing bracket (8) is connected to the drainage trough body (1) by a snap-fit ​​connection.

9. The heat exchanger unit (10) according to claim 7 or 8, wherein, The reinforcing bracket (8) has at least a partial L-shaped profile. In particular, it has horizontal support legs that extend continuously along the longitudinal direction of the drainage channel body (1), and In particular, it has one or more vertical support legs that are inserted into the corresponding recesses of the drainage trough body (1).

10. The heat exchanger unit (10) according to any one of the preceding claims, comprising at least one support element (85), said support element (85) being disposed outside the drain tank body (1) in the region of the connector (9) of the heat exchanger (2) and forming a support surface for receiving vertically downward forces. In particular, the at least one support element (85) forms part of the reinforcing bracket (8).

11. The heat exchanger unit (10) according to any one of the preceding claims, comprising a funnel (4) extending from above into the distribution member (3), the funnel (4) being elongated and forming a siphon with the distribution member (3), In particular, the funnel (4) is made of plastic, and In particular, at least one sidewall of the funnel includes a rib (42) or is corrugated.

12. The heat exchanger unit (10) according to claim 11, wherein, A retaining element (5) for intercepting contaminants is provided in the water inlet area of ​​the funnel (4), wherein the retaining element (5) forms a reinforcement of the funnel (4) to counteract the force acting on the funnel (4) from the outside in the horizontal direction. In particular, the retaining element (5) is a perforated metal sheet or a perforated plate. In particular, the funnel (4) includes a locking element protruding on its inner side to lock the retaining element (5) into the funnel.

13. The heat exchanger unit (10) according to claim 12, wherein, The retaining element (5) includes, on its upper side, a perforated area with a through hole (52) for water to pass through and for intercepting residue, and at least one collection area (53) with a lower position for collecting the blocked residue, wherein, in particular, the at least one collection area (53) is substantially unperforated, optionally except for a small drain hole (54).

14. The heat exchanger unit (10) according to any one of the preceding claims, comprising a circumferential funnel seal (45) disposed between the funnel (4) and the drain tank body (1) for sealing the drain area (12) of the heat exchanger unit (10), wherein the funnel seal (45) is compressed in a horizontal direction, wherein at least one of the following is particularly applicable: • The funnel (4) is inserted into the drain tank body (1) by a snap-fit ​​connection, wherein the funnel seal (45) deforms and engages with the protrusion of the drain tank body (1) when inserted, thereby forming part of the snap-fit ​​connection; • The funnel (4) is inserted into the drain trough body (1) by a snap-fit ​​connection, wherein the funnel (4) deforms and snaps onto the protrusion of the drain trough body (1) when inserted, thereby forming part of the snap-fit ​​connection.

15. The heat exchanger unit (10) according to any one of the preceding claims, comprising a cover frame (6) disposed on top, the cover frame having a vertical frame wall (61) extending longitudinally along the heat exchanger unit (10), wherein a snap-fit ​​connection for securing the cover frame (6) to the drain tank body (1) is formed between the inner side of the frame wall (61) and the outer side of the drain tank body (1). In particular, a circumferential frame seal (65) is arranged between the cover frame (6) and the drainage trough body (1).

16. The heat exchanger unit (10) according to any one of the preceding claims, comprising a piping fitting for connecting a new water pipe to the heat exchanger (2), the piping fitting having a fitting element (9) made particularly of metal; wherein, Each connector (9) is connected to the drain channel body (1) by form-fitting teeth, wherein the teeth prevent the connector (9) from rotating relative to the drain channel body (1). In particular, the shapes of the connector (9) and the drainage channel body (1) are designed such that the connector (9) can only be assembled in one rotational position relative to the drainage channel body (1). This is achieved, in particular, through the asymmetrical shape of the teeth.

17. A drain trough body (1), particularly for a heat exchanger unit (10) according to any one of the preceding claims, wherein the drain trough body (1) is for supplying and draining water through which it flows, and wherein the drain trough body (1) is for receiving an elongated heat exchanger (2) for connection to a fresh water supply mechanism, wherein the drain trough body (1) is elongated in shape. in, The drainage trough body (1) is used for a watertight connection to the base plate (100). For this purpose, the drainage trough body (1) includes a connecting frame (101). In the working state of the drainage trough body (1), the connecting frame (101) is pressed against the drainage trough body (1) by at least one clamping mechanism (103), and in the process, it is compressed to form an external seal (102) that seals the drainage trough body (1) with its surrounding environment.

18. The drainage trough body (1) according to claim 17, wherein, In the working state, the external seal (102) forms a seal between the drainage tank body (1) and the bottom plate (100).

19. The drainage trough body (1) according to claim 17, wherein, In the working state, the external seal (102) forms a seal between the drainage tank body (1) and the connecting frame (101), wherein there is a watertight connection between the connecting frame (101) and the base plate (100).

20. The drainage trough body (1) according to any one of claims 17 to 19, wherein, The at least one clamping mechanism (103) pulls the connecting frame (101) to the drain body (1), especially to the drain body flange (15) surrounding the drain body (1), especially along the direction of the reinforcing bracket (8) of the drain body (1).

21. The drainage trough body (1) according to any one of claims 17 to 20, wherein, One, two or more clamping mechanisms (103) are arranged along each longitudinal side of the drainage trough body (1).

22. The drainage trough body (1) according to any one of claims 17 to 20, wherein, The clamping mechanism (103) is arranged only on the end face of the drainage trough body (1) and not on the longitudinal side of the drainage trough body (1).

23. The drainage trough body (1) according to any one of claims 17 to 22, wherein, The drainage channel body (1) includes reinforcing elements, particularly reinforcing profiles, and especially reinforcing supports (8), which are connected to the drainage channel body (1) to strengthen the drainage channel body (1), wherein the reinforcing elements are particularly made of metal.

24. The drainage trough body (1) according to any one of claims 17 to 23, wherein, The connecting frame (101) includes reinforcing elements or reinforcing sections for increasing strength in the vertical direction.

25. The drainage trough body (1) according to any one of claims 17 to 24, wherein, The connecting frame (101) is made of stainless steel.

26. The drainage trough body (1) according to any one of claims 17 to 25, wherein, The drainage trough body (1) includes a connector (9) for connecting a new water pipe and for introducing and drawing new water through the side wall of the drainage trough body (1) to a heat exchanger (2) arranged inside the drainage trough body (1).

27. A connecting frame (101), particularly for a drainage trough body (1) according to any one of claims 17 to 26, • Includes profiles extending along the outer perimeter of a slender rectangle, ·in, The profile includes, on its upper side, a channel for receiving the edge of the base plate (100) and a sealant for sealing the base plate (100) relative to the connecting frame (101). • The profile includes a reinforcing element or reinforcing segment extending along the longitudinal side of the connecting frame (101) for increasing strength in the vertical direction.

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