Fixing structure and heat exchange equipment

Abstract

The utility model discloses a fixing structure and heat exchange equipment, the fixing structure comprises a first fixing piece, a second fixing piece and a plurality of fastening pieces, and the first fixing piece and the second fixing piece are oppositely spliced to form a mounting cavity capable of containing a plate heat exchanger; the multiple fasteners are arranged on the first fixing piece and the second fixing piece correspondingly and used for being connected with and fixing a plate heat exchanger, and a first locking part connected with a base of heat exchange equipment is formed at the bottom of the first fixing piece. And / or a second locking part connected with a base of the heat exchange equipment is formed at the bottom of the second fixing piece. The structure can effectively fix the plate heat exchanger and prevent the reliability problems of copper pipe leakage, water inlet and outlet pipe leakage and the like.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and in particular to a fixing structure and a heat exchange device. Background Art

[0002] In heat exchange equipment using plate heat exchangers, the fixation of the plate heat exchanger affects the welding of copper pipes and the installation of inlet and outlet water pipes. Because the fixation of the plate heat exchanger is slightly loose, the copper pipes welded to it may break during transportation, and the inlet and outlet water pipes connected to it may leak, which greatly affects the reliability of the equipment. As a heat exchanger component, the plate heat exchanger needs to be wrapped with insulation sponge on the outside, which causes certain problems for reliable fixation. The traditional fixing solution is to make a fastener and fix the wrapped sponge together with the fastener to the base of the equipment. However, since the sponge has a certain degree of resilience and shrinkage, this fixing solution does not actually achieve reliable fixation of the plate heat exchanger and the base. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a fixing structure and a heat exchange device to effectively fix the plate heat exchanger and prevent reliability problems such as copper tube leakage and water inlet and outlet pipe leakage.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] On the one hand, a fixing structure is provided, comprising: a first fixing member, a second fixing member and a plurality of fasteners, wherein the first fixing member and the second fixing member are relatively spliced ​​to form an installation cavity capable of accommodating a plate heat exchanger, the plurality of fasteners are respectively arranged on the first fixing member and the second fixing member, and the fasteners are used to connect and fix the plate heat exchanger, a first locking portion connected to a base of the heat exchange device is formed at the bottom of the first fixing member, and / or a second locking portion connected to the base of the heat exchange device is formed at the bottom of the second fixing member.

[0006] Furthermore, the plate heat exchanger is fixed to the installation cavity by means of a plurality of the fasteners, and a fixed gap is formed between the plate heat exchanger and the inner wall of the first fixing member, and a fixed gap is also formed between the plate heat exchanger and the inner wall of the second fixing member by means of the fasteners.

[0007] Furthermore, the fastener includes a first stud, a nut and a steel sleeve, and the first fixing member and the second fixing member are both provided with a fixing hole for the first stud to pass through. The first stud includes a first end and a second end, the first end is fixedly connected to the plate heat exchanger, and the second end passes through the fixing hole and is locked with the nut. The steel sleeve is sleeved on the first stud and abuts between the plate heat exchanger and the inner wall of the first fixing member, and between the plate heat exchanger and the inner wall of the second fixing member.

[0008] Furthermore, a spacer is provided between the steel casing and the inner walls of the first fixing member and the second fixing member, and / or a spacer is provided between the nut and the first fixing member and the second fixing member.

[0009] Further, the fastener includes a second stud and a nut, the second stud includes a first shaft portion and a second shaft portion, one end of the first shaft portion is connected to the plate heat exchanger, and the other end is connected to the second shaft portion, and a shoulder is formed at the connection between the first shaft portion and the second shaft portion, and the first fixing member and the second fixing member are both provided with fixing holes, the second shaft portion passes through the fixing hole and is locked with the nut, the shoulder abuts against the inner wall of the first fixing member, and / or the shoulder abuts against the inner wall of the second fixing member.

[0010] Further, the first fixing member includes a first plate body and two first side plates extending from both ends of the first plate body toward the second fixing member, and the second fixing member includes a second plate body and two second side plates extending from the second plate body toward the first fixing member.

[0011] Furthermore, the first side plate extends in a direction away from the installation cavity to form a first folded edge, and the second side plate is convexly provided with a second folded edge that cooperates with the first folded edge.

[0012] Furthermore, a third folded edge which can be connected to a panel of a heat exchange device is protruded from an end of the first folded edge which is away from the installation cavity.

[0013] Furthermore, the first fixing member is provided with a first through hole, and / or the second fixing member is provided with a second through hole.

[0014] On the other hand, a heat exchange device is also provided, comprising a base, a plate heat exchanger, and a fixing structure as described in any one of the above items, wherein the first locking portion and / or the second locking portion is installed on the base, and the plate heat exchanger is fixed to the installation cavity.

[0015] Furthermore, it also includes a buffer component, which is coated on the plate heat exchanger.

[0016] Furthermore, a gap is left between the bottom of the plate heat exchanger and the base, and the top of the plate heat exchanger extends out of the installation cavity.

[0017] Furthermore, the heat exchange equipment is an air conditioner or an air source heat pump.

[0018] The beneficial effects of the present application are as follows: an installation cavity is formed by splicing the first fixing member and the second fixing member, the plate heat exchanger is placed in the installation cavity, and then the fixed connection is completed by fasteners, and multiple fasteners are arranged on the first fixing member and the second fixing member respectively, so as to complete the fixation of the plate heat exchanger from the horizontal direction, and then the plate heat exchanger is fixed to the base of the heat exchange equipment by the first locking part and the second locking part, so as to complete the fixation of the plate heat exchanger from the vertical direction. The fixing structure realizes the effective fixation of the plate heat exchanger in at least two directions, prevents accidents such as copper pipe breakage and water pipe leakage during transportation, ensures the safety and stability of the transportation process, and at the same time ensures the reliability of the plate heat exchanger and the heat exchange equipment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described in detail below based on the drawings and embodiments.

[0020] Figure 1 A three-dimensional diagram of the fixing structure described in the embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the assembly of the fixed structure and the plate heat exchanger described in the embodiment of the present application;

[0022] Figure 3 This is an exploded schematic diagram of the fixing structure described in the embodiment of the present application;

[0023] Figure 4 This is a three-dimensional diagram of the first fixing member according to an embodiment of the present application;

[0024] Figure 5 A three-dimensional diagram of the second fixing member according to an embodiment of the present application;

[0025] Figure 6 A top view of the fixing structure described in the embodiment of the present application;

[0026] Figure 7 For this application Figure 6 Schematic diagram of the cross section at AA in the middle;

[0027] Figure 8 For this application Figure 7 A magnified schematic diagram at point B;

[0028] Fig. 9 This is a three-dimensional diagram of the second stud in the embodiment of the present application.

[0029] In the figure: 1. first fixing member; 101. first locking portion; 102. first plate body; 103. first side plate; 104. first folded edge; 105. third folded edge; 106. first through hole; 2. second fixing member; 201. second locking portion; 202. second plate body; 203. second side plate; 204. second folded edge; 205. second through hole; 3. fastener; 301. first stud; 302. nut; 303. spacer; 304. steel casing; 305. second stud; 3051. first shaft portion; 3052. second shaft portion; 3053. shaft shoulder; 4. fixing hole; 5. plate heat exchanger; 6. buffer. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0031] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] like Figure 1-Figure 8As shown, this embodiment provides a fixing structure, including: a first fixing member 1, a second fixing member 2 and a plurality of fasteners 3, the first fixing member 1 and the second fixing member 2 are relatively spliced ​​to form an installation cavity capable of accommodating a plate heat exchanger 5, the plurality of fasteners 3 are respectively arranged on the first fixing member 1 and the second fixing member 2, and the fasteners 3 are used to connect and fix the plate heat exchanger 5, the bottom of the first fixing member 1 is formed with a first locking portion 101 connected to the base of the heat exchange device, and / or the bottom of the second fixing member 2 is formed with a second locking portion 201 connected to the base of the heat exchange device.

[0034] Based on the above scheme, the first fixing member 1 and the second fixing member 2 are spliced ​​to form an installation cavity, the plate heat exchanger 5 is placed in the installation cavity, and then the fixed connection is completed by the fastener 3. A plurality of fasteners 3 are arranged on the first fixing member 1 and the second fixing member 2 respectively, so as to complete the fixation of the plate heat exchanger 5 from the horizontal direction, and then the plate heat exchanger 5 is fixed to the base of the heat exchange equipment by the first locking portion 101 and the second locking portion 201, so as to complete the fixation of the plate heat exchanger 5 from the vertical direction. The fixing structure realizes the effective fixation of the plate heat exchanger 5 in at least two directions, prevents accidents such as copper pipe breakage and water pipe leakage during transportation, ensures the safety and stability of the transportation process, and at the same time ensures the reliability of the plate heat exchanger 5 and the heat exchange equipment during use. In this solution, it is preferred that a first locking portion 101 is formed at the bottom of the first fixing member 1, and a second locking portion 201 is also formed at the bottom of the second fixing member 2. The plate heat exchanger 5 is stably installed on the base through the cooperation of the first locking portion 101 and the second locking portion 201. In addition, it can also be adjusted according to actual installation requirements.

[0035] In addition, in the existing fixing scheme of the plate heat exchanger 5, the plate heat exchanger 5 is usually fixed to the base of the equipment together with the thermal insulation sponge. However, the resilience and long-term stability of the sponge make this fixing method have hidden dangers. The sponge may lose its elasticity after long-term use or moisture, causing the fastener 3 originally used to fix the sponge to fail, thereby loosening the plate heat exchanger 5 and increasing the risk of equipment failure. Moreover, traditional fixing schemes often ignore the importance of sponge materials and do not fully consider their impact on the fixing effect.

[0036] In view of the above problems, in the fixing structure described in this embodiment, the plate heat exchanger 5 is fixed to the installation cavity by a plurality of the fasteners 3, and a fixed gap is formed between the plate heat exchanger 5 and the inner wall of the first fixing member 1, and a fixed gap is also formed between the plate heat exchanger 5 and the inner wall of the second fixing member 2 by the fasteners 3. The fasteners 3 can form fixed gaps between the plate heat exchanger 5 and the first fixing member 1 and the second fixing member 2, thereby preventing the plate heat exchanger 5 from moving in the horizontal direction and causing unstable installation.

[0037] Optionally, the fastener 3 includes a first stud 301, a nut 302 and a steel sleeve 304. The first fixing member 1 and the second fixing member 2 are both provided with a fixing hole 4 for the first stud 301 to pass through. The first stud 301 includes a first end and a second end. The first end is fixedly connected to the plate heat exchanger 5, and the second end passes through the fixing hole 4 and is locked with the nut 302. The steel sleeve 304 is sleeved on the first stud 301 and abuts between the plate heat exchanger 5 and the inner wall of the first fixing member 1, and between the plate heat exchanger 5 and the inner wall of the second fixing member 2. The first end of the first stud 301 is directly fixed on the plate heat exchanger 5, and then the second end extends out in the direction of the fixing hole 4. After the second end of the first stud 301 is fixed, it is tightened with the nut 302 located outside the installation cavity to complete the fixation. The tightness of the first stud 301 and the nut 302 is adjustable, that is, it can be adjusted according to the specific situation of the installation to ensure that the installation position of the plate heat exchanger 5 is appropriate and stable; in addition, since the steel sleeve 304 cannot pass through the fixing hole 4, the steel sleeve 304 is sleeved on the first stud 301, so that there is always a gap between the plate heat exchanger 5 and the first fixing member 1 and the second fixing member 2. In this solution, the first stud 301 and the plate heat exchanger 5 are an integrated structure.

[0038] As an optional specific implementation scheme, Fig. 9 As shown, the fastener 3 includes a second stud 305 and a nut 302, the second stud 305 includes a first shaft portion 3051 and a second shaft portion 3052, one end of the first shaft portion 3051 is connected to the plate heat exchanger 5, and the other end is connected to the second shaft portion 3052, and a shoulder 3053 is formed at the connection between the first shaft portion 3051 and the second shaft portion 3052, the first fixing member 1 and the second fixing member 2 are both provided with a fixing hole 4, the second shaft portion 3052 passes through the fixing hole 4 and is locked with the nut 302, the shoulder 3053 abuts against the inner wall of the first fixing member 1, and / or the shoulder 3053 abuts against the inner wall of the second fixing member 2. In this solution, the second shaft portion 3052 can pass through the fixing hole 4 and be tightened and locked with the nut 302, while the first shaft portion 3051 cannot pass through the fixing hole 4 and will rest against the inner walls of the first fixing member 1 and the second fixing member 2, so that a fixed gap always exists between the plate heat exchanger 5 and the inner walls of the first fixing member 1 and the second fixing member 2.

[0039] Furthermore, the first fixing member 1 and the second fixing member 2 are both in a "J" shape, the first fixing member 1 includes a first plate body 102 and two first side panels 103 extending from both ends of the first plate body 102 toward the second fixing member 2, the second fixing member 2 includes a second plate body 202 and two second side panels 203 extending from the second plate body 202 toward the first fixing member 1, the first side panel 103 extends away from the installation cavity to form a first folded edge 104, and the second side panel 203 is protrudingly provided with a second folded edge 204 that cooperates with the first folded edge 104. In this solution, the first fixing member 1 and the second fixing member 2 can be regarded as a structure symmetrical along the center line. The first folded edge 104 and the second folded edge 204 are abutted against each other, and the first folded edge 104 and the second folded edge 204 are locked by structural members such as screws, thereby ensuring that the first fixing member 1 and the second fixing member 2 form a stable installation cavity around the plate heat exchanger 5, and can fix the plate heat exchanger 5 around it, ensuring that the installation position of the plate heat exchanger 5 is stable; and the first fixing member 1 and the second fixing member 2 are detachable, so when the plate heat exchanger 5 needs to be replaced or repaired, the operation is more convenient.

[0040] Furthermore, a third folded edge 105 that can be connected to the panel of the heat exchange device is protruded from one end of the first folded edge 104 away from the installation cavity. On the basis that the bottoms of the first fixing member 1 and the second fixing member 2 are fixed to the base of the heat exchange device, in order to further improve the reliability of the installation of the fixed structure, the third folded edge 105 is locked and connected to the panel of the heat exchange device, so as to further stabilize the first fixing member 1 and the second fixing member 2 in the horizontal direction.

[0041] Further, an isolating piece 303 is provided between the steel sleeve 304 and the inner wall of the first fixing piece 1 and the second fixing piece 2, and / or an isolating piece 303 is provided between the nut 302 and the first fixing piece 1 and the second fixing piece 2. At the same time, an isolating piece 303 is provided between the nut 302 and the first fixing piece 1 or the second fixing piece 2, and the isolating piece 303 is abutted between the nut 302 and the first plate body 102, or between the nut 302 and the second plate body 202, so as to prevent the torsion force generated when the nut 302 is tightened from damaging the plate body, and plays a role of buffer protection and isolation. In addition, an isolating piece 303 is also provided between the steel sleeve 304 and the first fixing piece 1 or the second fixing piece 2, and the isolating piece 303 abuts against the inner wall of the first plate body 102 or the second plate body 202, and can also play a role of buffer protection and isolation.

[0042] It is worth mentioning that the steel casing 304 and the isolation piece 303 can be a split structure or an integrally formed piece, which can be adjusted according to actual design requirements; similarly, the second stud 305 can also be an integrally formed piece.

[0043] In addition, the fixing holes 4 are specifically opened on the first plate body 102 and the second plate body 202. The first plate body 102 and the second plate body 202 are arranged relatively to each other. There are eight openings, four on the first plate body 102 and four on the second plate body 202. The positions of the fixing holes 4 opened on the first plate body 102 and the second plate body 202 are corresponding, two each on the top and the bottom, respectively. This ensures that the plate heat exchanger 5 can be stably installed along the length direction of the plate heat exchanger 5.

[0044] Preferably, a first through hole 106 is provided on the first fixing member 1, and a second through hole 205 is provided on the second fixing member 2. The plate heat exchanger 5 is provided with a water inlet pipe, a water outlet pipe, a refrigerant inlet pipe, and a refrigerant outlet pipe. Therefore, when the plate heat exchanger 5 is fixed by the first fixing member 1 and the second fixing member 2, it is necessary to reasonably avoid these pipes. Therefore, a first through hole 106 is provided on the first fixing member 1, and a second through hole 205 is provided on the second fixing member 2. The specific position where the first through hole 106 is provided can be the first plate body 102 or the first side plate 103. Similarly, the specific position where the second through hole is provided can be the second plate body 202 or the second side plate 203. It can be adjusted according to the direction of the pipes of the plate heat exchanger 5 to avoid interference or collision between the fixing structure and the connecting pipes of the plate heat exchanger 5.

[0045] It is worth mentioning that, according to the pipeline arrangement of the plate heat exchanger 5 , the first through hole 106 can be selectively opened on the first fixing member 1 , or the second through hole 205 can be selectively opened on the second fixing member 2 .

[0046] On the other hand, a heat exchange device is also provided, including a base, a plate heat exchanger 5, and a fixing structure as described in any of the above items, wherein the first locking portion 101 and / or the second locking portion 201 is installed on the base, and the plate heat exchanger 5 is fixed to the installation cavity.

[0047] Furthermore, it also includes a buffer member 6, which is coated on the plate heat exchanger 5, wherein the buffer member 6 is specifically a thermal insulation sponge, which can play a role of buffering and heat preservation, prevent heat loss in the plate heat exchanger 5, and ensure the heat exchange efficiency of the plate heat exchanger 5.

[0048] Furthermore, by coordinating the positions of the fixing holes 4 and the fasteners 3, a gap is left between the bottom of the plate heat exchanger 5 and the base, and the top of the plate heat exchanger 5 extends out of the installation cavity. The bottom of the plate heat exchanger 5 does not contact the base of the heat exchange device, so that the vibration of the base will not be directly transmitted to the plate heat exchanger 5, and more installation space can be reserved for the pipeline setting of the plate heat exchanger 5. Similarly, exposing the top of the plate heat exchanger 5 can facilitate the connection of other pipelines.

[0049] Optionally, the heat exchange equipment is an air conditioner or an air source heat pump.

[0050] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of this application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0052] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0053] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. A fixing structure, characterized in that: include: A first fixing member (1), a second fixing member (2) and a plurality of fasteners (3), wherein the first fixing member (1) and the second fixing member (2) are spliced ​​to form an installation cavity capable of accommodating a plate heat exchanger (5), the plurality of fasteners (3) are respectively arranged on the first fixing member (1) and the second fixing member (2), and the fasteners (3) are used to connect and fix the plate heat exchanger (5), the bottom of the first fixing member (1) is formed with a first locking portion (101) connected to the base of the heat exchange device, and / or the bottom of the second fixing member (2) is formed with a second locking portion (201) connected to the base of the heat exchange device.

2. The fixing structure according to claim 1, characterized in that: The plate heat exchanger (5) is fixed to the installation cavity by means of a plurality of the fasteners (3), and the fasteners (3) form a fixed gap between the plate heat exchanger (5) and the inner wall of the first fixing member (1), and also form a fixed gap between the plate heat exchanger (5) and the inner wall of the second fixing member (2).

3. The fixing structure according to claim 2, characterized in that: The fastener (3) comprises a first stud (301), a nut (302) and a steel sleeve (304); the first fixing member (1) and the second fixing member (2) are both provided with a fixing hole (4) for the first stud (301) to pass through; the first stud (301) comprises a first end and a second end; the first end is fixedly connected to the plate heat exchanger (5); the second end passes through the fixing hole (4) and is locked with the nut (302); the steel sleeve (304) is sleeved on the first stud (301) and abuts between the plate heat exchanger (5) and the inner wall of the first fixing member (1), and between the plate heat exchanger (5) and the inner wall of the second fixing member (2).

4. The fixing structure according to claim 3, characterized in that: An isolation piece (303) is provided between the steel casing (304) and the inner walls of the first fixing piece (1) and the second fixing piece (2), and / or an isolation piece (303) is provided between the nut (302) and the first fixing piece (1) and the second fixing piece (2).

5. The fixing structure according to claim 2, characterized in that: The fastener (3) comprises a second stud (305) and a nut (302); the second stud (305) comprises a first shaft portion (3051) and a second shaft portion (3052); one end of the first shaft portion (3051) is connected to the plate heat exchanger (5), and the other end is connected to the second shaft portion (3052); a shaft shoulder (3053) is formed at the connection between the first shaft portion (3051) and the second shaft portion (3052); a fixing hole (4) is provided on the first fixing member (1) and the second fixing member (2); the second shaft portion (3052) passes through the fixing hole (4) and is locked with the nut (302); the shaft shoulder (3053) abuts against the inner wall of the first fixing member (1), and / or the shaft shoulder (3053) abuts against the inner wall of the second fixing member (2).

6. The fixing structure according to any one of claims 1 to 5, characterized in that: The first fixing member (1) comprises a first plate body (102) and two first side plates (103) extending from two ends of the first plate body (102) toward the second fixing member (2); the second fixing member (2) comprises a second plate body (202) and two second side plates (203) extending from the second plate body (202) toward the first fixing member (1).

7. The fixing structure according to claim 6, characterized in that: The first side panel (103) extends in a direction away from the installation cavity to form a first folded edge (104); the second side panel (203) is provided with a second folded edge (204) that cooperates with the first folded edge (104); and the first folded edge (104) is provided with a third folded edge (105) that can be connected to a panel of a heat exchange device at one end away from the installation cavity.

8. The fixing structure according to any one of claims 1 to 5, characterized in that: The first fixing member (1) is provided with a first through hole (106), and / or the second fixing member (2) is provided with a second through hole (205).

9. A heat exchange device, characterized in that: It comprises a base, a plate heat exchanger (5), and a fixing structure according to any one of claims 1 to 8, wherein the first locking portion (101) and / or the second locking portion (201) are mounted on the base, and the plate heat exchanger (5) is fixed to the mounting cavity.

10. The heat exchange device according to claim 9, characterized in that: It also comprises a buffer component (6), wherein the buffer component (6) is coated on the plate heat exchanger (5).

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