Plate heat exchanger

Abstract

The utility model discloses a plate heat exchanger, relates to the technical field of heat exchange, and aims at solving the problem that a traditional heat exchanger is large in mold opening number. According to the heat exchanger, a first core plate is provided with a first medium through hole and a closed boss; wherein the third surface of one second core plate is opposite to the second surface of the first core plate, the second core plate and the third core plate are respectively provided with a first medium through hole and a second medium through hole, and a first annular table protruding away from the first core plate is arranged around the first medium through hole of the second core plate. A second annular table protruding towards the closed boss is arranged on the periphery of the second medium through hole of the second core plate, and the second annular table on the second core plate adjacent to the first core plate is matched with the closed boss in an abutting mode. A third annular table protruding towards the first core plate is arranged around the first medium through hole of the third core plate, a fourth annular table protruding away from the closed boss is arranged around the second medium through hole of the third core plate, the third core plate and the second core plate are alternately arranged in a stacked mode, and the second annular table is matched with the fourth annular table of the adjacent third core plate in an abutting mode.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, specifically to a plate heat exchanger. Background Technology

[0002] Currently, existing heat exchangers require multiple chips to be welded at the top. To meet the requirements of installation strength and weldability, four different chip structures are usually used to connect them. Each chip structure requires a separate mold, resulting in a large number of molds, which reduces the production efficiency of plate heat exchangers and increases manufacturing costs. Utility Model Content

[0003] The purpose of this invention is to provide a plate heat exchanger that reduces the number of molds required while ensuring structural strength and weldability, thereby reducing the production cost of the plate heat exchanger.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] In a first aspect, this utility model provides a plate heat exchanger, comprising:

[0006] The first core board has a first side and a second side facing each other. The first core board has a first medium through hole and a closed boss protruding towards the first side of the first core board.

[0007] Multiple second core plates, each having a corresponding third and fourth surface, wherein the third surface of one second core plate is opposite to the second surface of the first core plate, the second core plate has a first medium through hole and a second medium through hole, a first annular platform protruding away from the first core plate is provided around the first medium through hole of the second core plate, and a second annular platform protruding towards the closing boss is provided around the second medium through hole of the second core plate, and the second annular platform on one of the second core plates adjacent to the first core plate abuts against the closing boss;

[0008] Multiple third core boards, each having a corresponding fifth and sixth surface, are provided with a first medium through hole and a second medium through hole. A third annular platform protruding towards the first core board is provided around the first medium through hole of the third core board, and a fourth annular platform protruding away from the closed boss is provided around the second medium through hole of the third core board. The third core boards and the second core boards are alternately stacked, and the second annular platform of the second core board abuts against the fourth annular platform of the adjacent third core board.

[0009] Optionally, the plate heat exchanger also includes a connecting pipe, and a first insertion ring protruding towards the first surface of the first core plate is provided around the first medium through hole of the first core plate, and one end of the connecting pipe is sealed and inserted into the first insertion ring.

[0010] Optionally, in the above-mentioned plate heat exchanger, the connection between the closed boss and the first surface has a first rounded corner, the connection between the first insertion ring and the first surface has a second rounded corner, and the connection between the second ring platform and the third surface has a third rounded corner. The radius of the first rounded corner is equal to the radius of the second rounded corner.

[0011] Optionally, in the above-mentioned plate heat exchanger, the radius of the first rounded corner is greater than or equal to the radius of the third rounded corner.

[0012] Optionally, in the above-mentioned plate heat exchanger, the second side of the first core plate is welded to the third side of the adjacent second core plate near the periphery of the second ring platform, and the outer wall of the connecting pipe is welded to the inner wall of the first insertion ring at the contact point.

[0013] And / or, the protrusion height of the second ring platform relative to the third surface of the second core plate is 0.5mm to 2.5mm;

[0014] And / or, the length of the connector extending into the first plug ring is 2mm to 4mm, and the protrusion height of the end of the first plug ring relative to the second surface of the first core plate is greater than or equal to the sum of the length of the connector extending into the first plug ring and the protrusion height of the second ring platform relative to the fourth surface;

[0015] And / or, the thickness of the first core board is 1mm to 3mm;

[0016] And / or, the thickness of the second core board is 0.3mm to 0.5mm.

[0017] Compared with the prior art, when adopting the above technical solution, the second ring platform on the second core plate adjacent to the first core plate abuts against the closed boss of the first core plate. The third core plate and the second core plate are stacked alternately, and the second ring platform of the second core plate abuts against the fourth ring platform of the adjacent third core plate. This ensures that there is an abutting area between each pair of adjacent core plates for support. Compared with the traditional plate heat exchanger which requires separate molding of four different chip structures, this application only requires molding of the first chip, the second chip, and the third chip. This reduces the number of parts and the number of molding operations while ensuring the same strength and weldability, thus speeding up the production cycle and reducing the manufacturing cost of the plate heat exchanger.

[0018] Secondly, this utility model also provides a plate heat exchanger, comprising:

[0019] The first core board has a first side and a second side, and the first core board has a first medium through hole;

[0020] Multiple second core boards, each having a corresponding third and fourth surface, wherein the third surface of one second core board is opposite to the second surface of the first core board, the second core board has a first medium through hole and a second medium through hole, a fifth annular platform protruding towards the first core board is provided around the first medium through hole of the second core board, and a sixth annular platform protruding away from the first core board is provided around the second medium through hole of the second core board;

[0021] Multiple third core boards, each having a fifth and a sixth face, each third core board having a first medium through hole and a second medium through hole, a seventh ring platform facing away from the first core board is arranged around the first medium through hole of the third core board, and an eighth ring platform facing towards the first core board is arranged around the second medium through hole of the third core board. The second and third core boards are stacked alternately, and the sixth ring of the second core board abuts against the eighth ring platform of the adjacent third core board.

[0022] The connector has one end inserted into the first medium through hole on the first core plate, and the end of the connector abuts against the fifth ring platform of the second core plate, and the connector is connected to the first medium through hole.

[0023] Optionally, in the above-mentioned plate heat exchanger, a second insertion ring protruding towards the first surface of the first core plate is provided around the first medium through hole of the first core plate, and one end of the pipe is sealed and inserted into the second insertion ring.

[0024] Optionally, in the above-mentioned plate heat exchanger, the connection between the second insertion ring and the first surface of the first core plate has a fourth rounded corner, the connection between the fifth ring platform and the third surface of the second core plate and the connection between the eighth ring platform and the fifth surface of the third core plate both have a fifth rounded corner, the connection between the sixth ring platform and the fourth surface of the second core plate and the connection between the seventh ring platform and the sixth surface of the third core plate both have a sixth rounded corner, and the radius of the fifth rounded corner is equal to the radius of the sixth rounded corner.

[0025] Optionally, in the above-mentioned plate heat exchanger, the radius of the fourth fillet is greater than or equal to the radius of the fifth fillet.

[0026] Optionally, in the above-mentioned plate heat exchanger, the second side of the first core plate is welded to the third side of the adjacent second core plate near the area surrounding the fifth ring platform, and the outer wall of the connecting pipe is welded to the inner wall of the second insertion ring at the point of contact.

[0027] And / or, the end of the nozzle is welded to the top surface of the fifth ring platform.

[0028] Compared with the prior art, when adopting the above technical solution, the fifth ring platform on the second core plate adjacent to the first core plate abuts against the end of the connecting pipe. The third core plate and the second core plate are stacked alternately, and the sixth ring platform of the second core plate abuts against the eighth ring platform of the adjacent third core plate. This ensures that there is an abutting area between each pair of adjacent core plates for support. Compared with the traditional plate heat exchanger which requires separate molding of four different chip structures, this application only requires molding of the first chip, the second chip, and the third chip. This reduces the number of parts and the number of molding operations while ensuring the same strength and weldability, thus speeding up the production cycle and reducing the manufacturing cost of the plate heat exchanger. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0030] Figure 1 A schematic diagram of the overall structure of the first type of plate heat exchanger provided in the embodiment of this utility model;

[0031] Figure 2 for Figure 1 Cross-sectional view;

[0032] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0033] Figure 4 for Figure 1 A diagram illustrating the stacking process during installation;

[0034] Figure 5 This is a schematic diagram of the overall structure of the second type of plate heat exchanger provided in this embodiment of the utility model;

[0035] Figure 6 for Figure 5 Cross-sectional view;

[0036] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0037] Figure 8 for Figure 5 A diagram illustrating the stacking process during installation;

[0038] Figure 9 A partial structural schematic diagram of the third type of plate heat exchanger provided in this embodiment of the present utility model.

[0039] Figure label:

[0040] 1-First core board; 11-Closed boss; 2-Second core board; 21-First ring platform; 22-Second ring platform; 23-Fifth ring platform; 24-Sixth ring platform; 3-Third core board; 31-Third ring platform; 32-Fourth ring platform; 33-Seventh ring platform; 34-Eighth ring platform; 4-First medium through hole; 5-Second medium through hole; 6-Connecting pipe; 7-First insertion ring; 8-Second insertion ring. Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0044] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] like Figures 1-4 As shown in the figure, an embodiment of the present invention provides a plate heat exchanger, comprising: a first core plate 1, a plurality of second core plates 2, and a plurality of third core plates 3.

[0047] The first core plate 1 has a first and a second opposing surface, and a first medium through hole 4 is formed in the first core plate 1. The first core plate 1 also has a closed boss 11 protruding towards the first surface of the first core plate 1. Each second core plate 2 has a third and a fourth opposing surface, with the third surface of one of the second core plates 2 being opposite to the second surface of the first core plate 1. The second core plate 2 has a first medium through hole 4 and a second medium through hole 5. A first annular platform 21, which is opposite to the protrusion of the first core plate 1, is provided around the first medium through hole 4 of the second core plate 2. A second annular platform 21, which protrudes towards the closed boss 11, is provided around the second medium through hole 5 of the second core plate 2. Platform 22, a second annular platform 22 on a second core plate 2 adjacent to the first core plate 1 abuts against the closed boss 11; each third core plate 3 has a fifth and a sixth opposite side, the third core plate 3 is provided with a first medium through hole 4 and a second medium through hole 5, a third annular platform 31 protruding towards the first core plate 1 is provided around the first medium through hole 4 of the third core plate 3, a fourth annular platform 32 protruding away from the closed boss 11 is provided around the second medium through hole 5 of the third core plate 3, the third core plate 3 and the second core plate 2 are alternately stacked, and the second annular platform 22 of the second core plate 2 abuts against the fourth annular platform 32 of the adjacent third core plate 3.

[0048] In specific implementation, such as Figure 4 As shown, the second annular platform 22 on a second core plate 2 adjacent to the first core plate 1 abuts against the closed boss 11 of the first core plate 1. The third core plate 3 and the second core plate 2 are stacked alternately. The second annular platform 22 of the second core plate 2 abuts against the fourth annular platform 32 of the adjacent third core plate 3, so that there is an abutting area between each pair of adjacent core plates for support. Compared with the traditional plate heat exchanger, which requires four different chip structures to be molded separately, this application only needs to mold the first chip, the second chip and the third chip. This can reduce the types of parts, reduce the number of mold openings, speed up the production cycle and reduce the manufacturing cost of the plate heat exchanger while ensuring the same strength and weldability.

[0049] like Figures 1-4 As shown, specifically in this embodiment, the plate heat exchanger further includes a connecting pipe 6. A first insertion ring 7 protruding towards the first surface of the first core plate 1 is provided around the first medium through hole 4 of the first core plate 1. One end of the connecting pipe 6 is sealed and inserted into the first insertion ring 7. This arrangement ensures the connection strength and sealing performance between the connecting pipe 6 and the first core plate 1.

[0050] Specifically, in this embodiment, the connection between the closed boss 11 and the first surface has a first rounded corner, the connection between the first insertion ring 7 and the first surface has a second rounded corner, and the connection between the second ring platform 22 and the third surface has a third rounded corner. The radius of the first rounded corner is equal to the radius of the second rounded corner. This arrangement ensures that the machining dimensions of the first and second rounded corners are the same, reducing the difficulty of mold making and further reducing the manufacturing cost of the plate heat exchanger.

[0051] like Figure 3 As shown, specifically in this embodiment, the radius of the first rounded corner is greater than or equal to the radius of the third rounded corner. This arrangement facilitates installation and positioning when the second annular platform 22 on a second core plate 2 adjacent to the first core plate 1 abuts against the closed boss 11.

[0052] Specifically, in this embodiment, the second surface of the first core plate 1 is welded to the third surface of the adjacent second core plate 2 near the periphery of the second ring platform 22, and the outer wall of the connecting pipe 6 is welded to the inner wall of the first insertion ring 7 at the point of contact. This arrangement ensures the connection strength between the various structures of the plate heat exchanger and the stability of the structure.

[0053] like Figure 3 and Figure 7 As shown, specifically, in this embodiment, the protrusion height of the second ring platform 22 relative to the third surface of the second core plate 2 is 0.5mm to 2.5mm; and / or, the length of the pipe 6 extending into the first insertion ring 7 is 2mm to 4mm, and the protrusion height of the end of the first insertion ring 7 relative to the second surface of the first core plate 1 is greater than or equal to the sum of the length of the pipe 6 extending into the first insertion ring 7 and the protrusion height of the second ring platform 22 relative to the fourth surface; and / or, the thickness of the first core plate 1 is 1mm to 3mm; and / or, the thickness of the second core plate 2 is 0.3mm to 0.5mm. For example, the protrusion height h1 of the second ring platform 22 relative to the third surface of the second core plate 2 can be 0.5mm, 1mm, 2mm or 2.5mm, etc., the length h2 of the pipe 6 extending into the first insertion ring 7 can be 2mm, 2.5mm, 3mm or 4mm, etc., the thickness h3 of the first core plate 1 can be 1mm, 1.5mm, 2mm or 3mm, etc., and the thickness h4 of the second core plate 2 can be 0.3mm, 0.4mm or 0.5mm, etc. Here, the protrusion height h1 of the second ring platform 22 relative to the fourth surface, the length h2 of the pipe 6 extending into the first insertion ring 7, the thickness h3 of the first core plate 1 and the thickness h4 of the second core plate 2 are not limited to the cases listed in this embodiment, as long as the structural strength and weldability of the plate heat exchanger are guaranteed.

[0054] like Figures 5-8 As shown, this embodiment of the invention also provides a plate heat exchanger, comprising: a first core plate 1, multiple second core plates 2, multiple third core plates 3, and connecting pipes 6.

[0055] The first core plate 1 has a first and a second opposing surface, and a first dielectric through-hole 4 is formed in the first core plate 1. Each second core plate 2 has a third and a fourth opposing surface, wherein the third surface of one second core plate 2 is opposite to the second surface of the first core plate 1. The second core plate 2 has a first dielectric through-hole 4 and a second dielectric through-hole 5. A fifth annular platform 23 protruding towards the first core plate 1 is arranged around the first dielectric through-hole 4 of the second core plate 2, and a sixth annular platform 24 protruding away from the first core plate 1 is arranged around the second dielectric through-hole 5 of the second core plate 2. Each third core plate 3 has a fifth and a sixth opposing surface. The three-core board 3 has a first medium through hole 4 and a second medium through hole 5. The first medium through hole 4 of the third core board 3 is surrounded by a seventh ring platform 33 that protrudes away from the first core board 1. The second medium through hole 5 of the third core board 3 is surrounded by an eighth ring platform 34 that protrudes towards the first core board 1. The second core board 2 and the third core board 3 are stacked alternately. The sixth ring of the second core board 2 abuts against the eighth ring platform 34 of the adjacent third core board 3. One end of the connector 6 is inserted into the first medium through hole 4 on the first core board 1. The end of the connector 6 abuts against the fifth ring platform 23 of the second core board 2, and the connector 6 is connected to the first medium through hole 4.

[0056] In specific implementation, such as Figure 8 As shown, the fifth ring platform 23 on a second core plate 2 adjacent to the first core plate 1 abuts against the end of the connecting pipe 6. The third core plate 3 and the second core plate 2 are stacked alternately. The sixth ring platform 24 of the second core plate 2 abuts against the eighth ring platform 34 of the adjacent third core plate 3, so that there is an abutting area between each pair of adjacent core plates for support. Compared with the traditional plate heat exchanger, which requires four different chip structures to be molded separately, this application only needs to mold the first chip, the second chip and the third chip. This can reduce the types of parts, reduce the number of mold openings, speed up the production cycle and reduce the manufacturing cost of the plate heat exchanger while ensuring the same strength and weldability.

[0057] Specifically, in this embodiment, a second insertion ring 8 protruding towards the first surface of the first core plate 1 is provided around the first medium through hole 4 of the first core plate 1, and one end of the connecting pipe 6 is sealed and inserted into the second insertion ring 8. This facilitates the installation of the connecting pipe 6 into the second insertion ring 8, realizing the connection and fixation between the connecting pipe 6 and the first core plate 1, and ensuring the connection strength and sealing performance between the connecting pipe 6 and the first core plate 1.

[0058] Specifically, in this embodiment, the connection between the second insertion ring 8 and the first surface of the first core plate 1 has a fourth rounded corner; the connection between the fifth ring platform 23 and the third surface of the second core plate 2, and the connection between the eighth ring platform 34 and the fifth surface of the third core plate 3, both have fifth rounded corners; and the connection between the sixth ring platform 24 and the fourth surface of the second core plate 2, and the connection between the seventh ring platform 33 and the sixth surface of the third core plate 3, both have sixth rounded corners. The radius of the fifth rounded corner is equal to the radius of the sixth rounded corner. This arrangement ensures that the processing dimensions of the fifth and sixth rounded corners are the same, reducing the difficulty of mold making for the second core plate 2 and the third core plate 3, and further reducing the manufacturing cost of the plate heat exchanger.

[0059] Specifically, in this embodiment, the radius of the fourth rounded corner is greater than or equal to the radius of the fifth rounded corner. This arrangement facilitates installation and positioning when the fifth annular platform 23 on a second core plate 2 adjacent to the first core plate 1 abuts against the end of the connecting pipe 6.

[0060] Specifically, in this embodiment, the second surface of the first core plate 1 is welded to the third surface of the adjacent second core plate 2 near the periphery of the fifth ring platform 23, and the outer wall of the connecting pipe 6 is welded to the inner wall of the second insertion ring 8 at the contact point; and / or, the end of the connecting pipe 6 is welded to the top surface of the fifth ring platform 23. This facilitates the structural connection between the first core plate 1 and the second core plate 2, between the connecting pipe 6 and the first core plate 1, and between the connecting pipe 6 and the second core plate 2, ensuring the connection strength and structural stability of the plate heat exchanger.

[0061] Specifically, in this embodiment, the protrusion height of the fifth ring platform 23 relative to the third surface of the second core plate 2 and the protrusion height of the eighth ring platform 34 relative to the fifth surface of the third core plate 3 are both equal to the protrusion height h1 of the second ring platform 22 relative to the third surface of the second core plate 2, as long as the structural strength and weldability of the plate heat exchanger are guaranteed.

[0062] like Figure 9As shown, as one possible implementation, the first core plate 1 can also adopt a flat plate structure at the location of the closed boss 11. In this case, the second core plate 2 does not need to have a clearance structure relative to the closed boss 11. The first medium through hole 4 and the second medium through hole 5 are opened on the second core plate 2. Only a fifth ring platform 23 protruding towards the first core plate 1 is set around the first medium through hole 4. The fifth ring platform 23 of the second core plate 2 abuts and cooperates with the end of the pipe 6. That is, the first core plate 1 and the second core plate 2 adjacent to the first core plate 1 have planar contact support. The fourth surface of the second core plate 2 adjacent to the first core plate 1 and the fifth surface of the third core plate 3 abuts and cooperates with the eighth ring platform 34. The second core plate 2 and the third core plate 3 are stacked alternately. The fifth ring of the second core plate 2 abuts and cooperates with the sixth surface of the adjacent third core plate 3. This reduces the number of ring platform structures set on the first core plate 1, the second core plate 2 and the third core plate 3. The flat plate structure is used in some areas, which reduces the difficulty of mold opening and reduces the production and manufacturing cost of plate heat exchangers.

[0063] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A plate heat exchanger, characterized in that, include: The first core board has a first side and a second side facing each other. The first core board has a first medium through hole and a closed boss protruding towards the first side of the first core board. Multiple second core plates, each having a third and a fourth face, wherein the third face of one second core plate is opposite to the second face of the first core plate, the second core plate has a first medium through hole and a second medium through hole, a first annular platform is provided around the first medium through hole of the second core plate facing away from the first core plate, and a second annular platform is provided around the second medium through hole of the second core plate facing towards the closing boss, and the second annular platform on one of the second core plates adjacent to the first core plate abuts against the closing boss; Multiple third core boards, each having a fifth and a sixth opposing surface, each third core board having a first medium through hole and a second medium through hole, a third annular platform protruding towards the first core board surrounding the first medium through hole, and a fourth annular platform protruding away from the closed boss surrounding the second medium through hole of the third core board, the third core boards and the second core boards being alternately stacked, the second annular platform of the second core board abutting against the fourth annular platform of the adjacent third core board.

2. The plate heat exchanger according to claim 1, characterized in that, It also includes a connector, and a first insertion ring protruding towards the first surface of the first core plate is provided around the first medium through hole of the first core plate, and one end of the connector is sealed and inserted into the first insertion ring.

3. The plate heat exchanger according to claim 2, characterized in that, The connection between the closed boss and the first surface has a first rounded corner, the connection between the first insertion ring and the first surface has a second rounded corner, and the connection between the second ring platform and the third surface has a third rounded corner. The radius of the first rounded corner is equal to the radius of the second rounded corner.

4. The plate heat exchanger according to claim 3, characterized in that, The radius of the first rounded corner is greater than or equal to the radius of the third rounded corner.

5. The plate heat exchanger according to claim 2, characterized in that, The second side of the first core plate is welded to the third side of the adjacent second core plate near the periphery of the second ring platform, and the outer wall of the connecting pipe is welded to the inner wall of the first insertion ring at the contact point. And / or, the protrusion height of the second ring platform relative to the third surface of the second core plate is 0.5mm to 2.5mm; And / or, the length of the connecting pipe extending into the first plug ring is 2mm to 4mm, and the protrusion height of the end of the first plug ring relative to the second surface of the first core plate is greater than or equal to the sum of the length of the connecting pipe extending into the first plug ring and the protrusion height of the second ring platform relative to the fourth surface; And / or, the thickness of the first core board is 1mm to 3mm; And / or, the thickness of the second core board is 0.3mm to 0.5mm.

6. A plate heat exchanger, characterized in that, include: The first core board has a first side and a second side facing each other, and the first core board has a first medium through hole; Multiple second core boards, each second core board having a third and a fourth face, wherein the third face of one second core board is disposed opposite to the second face of the first core board, the second core board having a first medium through hole and a second medium through hole, a fifth ring platform protruding toward the first core board is disposed around the first medium through hole of the second core board, and a sixth ring platform protruding away from the first core board is disposed around the second medium through hole of the second core board; Multiple third core boards, each having a fifth and a sixth face, each third core board having a first medium through hole and a second medium through hole, a seventh ring platform facing away from the first core board is provided around the first medium through hole of the third core board, and an eighth ring platform facing towards the first core board is provided around the second medium through hole of the third core board. The second core board and the third core board are stacked alternately, and the sixth ring of the second core board abuts against the eighth ring platform of the adjacent third core board. A connector is inserted into the first medium through hole on the first core plate at one end, and the end of the connector abuts against the fifth ring platform of the second core plate, and the connector communicates with the first medium through hole.

7. The plate heat exchanger according to claim 6, characterized in that, A second insertion ring protruding towards the first surface of the first core plate is provided around the first medium through hole of the first core plate, and one end of the connecting pipe is sealed and inserted into the second insertion ring.

8. The plate heat exchanger according to claim 7, characterized in that, The second insertion ring has a fourth rounded corner at the connection point with the first surface of the first core board. The fifth ring platform has a fifth rounded corner at the connection point with the third surface of the second core board and the eighth ring platform has a fifth rounded corner at the connection point with the fifth surface of the third core board. The sixth ring platform has a sixth rounded corner at the connection point with the fourth surface of the second core board and the seventh ring platform has a sixth rounded corner at the connection point with the sixth surface of the third core board. The radius of the fifth rounded corner is equal to the radius of the sixth rounded corner.

9. The plate heat exchanger according to claim 8, characterized in that, The radius of the fourth fillet is greater than or equal to the radius of the fifth fillet.

10. The plate heat exchanger according to claim 7, characterized in that, The second side of the first core plate is welded to the third side of the adjacent second core plate near the area surrounding the fifth ring platform, and the outer wall of the connecting pipe is welded to the inner wall of the second insertion ring at the point of contact. And / or, the end of the connecting pipe is welded to the top surface of the fifth ring platform.

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