Plate heat exchanger and heat exchange system

Abstract

The utility model provides a kind of plate heat exchanger and heat exchange system, every group passage structure of plate heat exchanger includes two heat exchange sheets, and heat exchange sheet is provided with opening, and the outer periphery of opening is formed with welding ring area, every group passage structure further includes a distribution ring, the inner ring area of welding ring area is provided with reinforcing protrusion, distribution ring is set on the outer periphery of reinforcing protrusion and located on the outer ring area of welding ring area, and distribution ring is radially penetrated and is provided with multiple distribution holes, multiple distribution holes are arranged in the circumferential direction of distribution ring;In every group passage structure, the heat exchange protrusion of adjacent two heat exchange sheets is contacted to form fluid passage, and distribution ring is located between the welding ring area of adjacent two heat exchange sheets in height direction, and distribution hole is communicated between distribution hole and fluid passage.The utility model plate heat exchanger can effectively enhance structural strength and compression strength, and drainage distribution fluid medium, improve the distribution uniformity of fluid medium and heat exchange performance.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a plate heat exchanger and a heat exchange system having the plate heat exchanger. Background Technology

[0002] A plate heat exchanger is a high-efficiency heat exchanger composed of multiple metal heat exchange plates with a specific point-wave heat exchange structure. The point-wave heat exchange structures of adjacent heat exchange plates form staggered fluid channels, allowing cold and hot fluids to flow within these channels respectively, thus exchanging heat. Plate heat exchangers are characterized by high heat exchange efficiency, light weight, small footprint, compact structure, and long service life, and are widely used in fields including refrigeration and heating, waste heat recovery, chemical industry, aerospace, power, shipbuilding, and automotive batteries, demonstrating a large market and promising development prospects.

[0003] Heat exchange plates are the core components of plate heat exchangers. The fluid medium is usually in a state of high and low pressure fluctuation, with the maximum working pressure reaching more than 4MPa. Therefore, the compressive strength requirements of the heat exchange plates are high. In addition, the fluid medium flows alternately in the various fluid channels of the plate heat exchanger. If leakage occurs, it will directly lead to serious consequences.

[0004] Existing heat exchanger plates have four through-holes to allow corresponding fluid media to enter and exit the interior of the plate heat exchanger. To weld and fix adjacent heat exchanger plates, a welding ring is formed around the outer perimeter of each through-hole. Since a larger welding sealing area results in a better sealing effect, existing heat exchanger plates typically improve welding sealing by increasing the area of ​​the welding ring around the through-hole, i.e., increasing the width of the welding ring in the radial direction of the through-hole. However, when the width of the welding ring in the radial direction of the through-hole is large, the welding ring is prone to corrugated deformation under external forces, and the stress distribution in the through-hole becomes too concentrated, making it more susceptible to deformation, cracking, and other damage, leading to fluid media leakage.

[0005] To improve structural strength, existing methods involve welding a ring around the opening and installing multiple protrusions arranged circumferentially around the opening. However, these protrusions obstruct the flow of fluid medium entering and exiting the opening, significantly increasing flow resistance at the opening and thus affecting heat transfer performance. Summary of the Invention

[0006] To achieve the primary objective of this invention, a plate heat exchanger is provided that can effectively enhance the structural strength and compressive strength of the welded ring area around the opening, thereby preventing deformation and cracking of the opening and effectively eliminating the risk of fluid leakage. At the same time, it can guide and distribute the fluid medium at the opening to improve the uniformity of fluid distribution and thus improve heat exchange performance.

[0007] To achieve the second objective of this utility model, this utility model provides a heat exchange system having the above-mentioned plate heat exchanger.

[0008] To achieve the primary objective of this invention, a plate heat exchanger is provided, comprising multiple sets of channel structures arranged along the height direction of the plate heat exchanger. Each set of channel structures includes two heat exchange plates with through-holes. A welded ring area is formed around the outer periphery of the through-holes, and the heat exchange area of ​​the heat exchange plates is provided with multiple heat exchange protrusions arranged along the length and width directions of the plate heat exchanger. Each set of channel structures also includes a distribution ring, and the inner ring area of ​​the welded ring area near the through-hole is provided with reinforcing elements. The distribution ring is fitted around the outer periphery of the reinforcing protrusion and located in the outer ring area of ​​the welded ring region, away from the hole. The distribution ring has multiple distribution holes radially through it, which are arranged in the circumferential direction. The reinforcing protrusion and the heat exchange protrusion have the same protrusion direction, and the protrusion height of the reinforcing protrusion is less than that of the heat exchange protrusion. In each set of channel structures, the heat exchange protrusions of two adjacent heat exchange plates contact each other to form a fluid channel. The distribution ring is located between the welded ring regions of two adjacent heat exchange plates in the height direction, and the distribution holes connect the distribution holes and the fluid channel.

[0009] As can be seen from the above scheme, the outer periphery of the opening of the heat exchange plate of this utility model plate heat exchanger is surrounded by a welded ring area. A reinforcing protrusion is provided in the inner ring area of ​​this welded ring area near the opening, which effectively enhances the structural strength and compressive strength of the welded ring area around the opening, preventing deformation and cracking of the opening and thus effectively eliminating the risk of fluid leakage. Furthermore, the distribution ring of this utility model plate heat exchanger is sleeved on the outer periphery of the reinforcing protrusion and located in the outer ring area of ​​the welded ring area away from the opening. In each channel structure, the distribution ring is located in the height direction between the welded ring areas of two adjacent heat exchange plates, and the distribution holes of the distribution ring connect the distribution holes to the fluid channels. Thus, the multiple distribution holes arranged circumferentially on the distribution ring can guide and distribute the fluid medium at the opening, improving the uniformity of fluid distribution and thereby enhancing heat exchange performance. Furthermore, the outer peripheral welding ring area of ​​the opening in this utility model includes an inner ring area with reinforcing protrusions and an outer ring area with supporting distribution rings, which increases the area of ​​the outer peripheral welding ring area of ​​the opening to improve the welding sealing performance and effectively eliminate the risk of leakage of fluid media.

[0010] Therefore, the plate heat exchanger of this utility model can effectively enhance the structural strength and compressive strength of the outer welded ring area of ​​the opening, so as to avoid deformation and cracking of the opening, improve the pressure resistance of the plate heat exchanger, thereby effectively eliminating the risk of fluid leakage. At the same time, it can guide and distribute the fluid medium at the opening to improve the uniformity of fluid medium distribution, thereby improving the heat exchange performance.

[0011] A further option is to provide multiple reinforcing protrusions in the inner ring area, which are arranged in the circumferential direction of the opening. A positioning groove is formed between two adjacent reinforcing protrusions in the circumferential direction of the opening. The inner ring hole of the distribution ring is provided with a positioning part, which is located in the positioning groove.

[0012] A further option is that the reinforcing protrusion extends in a long strip shape in the radial direction of the opening; or, the reinforcing protrusion extends in a fan shape in the circumferential direction of the opening; or, the cross-section of the reinforcing protrusion in the radial direction of the opening is hexagonal.

[0013] A further option is to set a limiting protrusion in the outer ring area, with the protrusion direction and height of the limiting protrusion and the reinforcing protrusion being consistent, and a limiting groove being opened in the inner ring hole of the distribution ring, with the limiting protrusion located in the limiting groove.

[0014] A further solution is to reinforce the protrusions in a closed loop around the opening, and to connect the limiting protrusions with the reinforcing protrusions.

[0015] A further option is to have two reinforcing protrusions, which are arranged in concentric circles with the center of the opening. The end of the limiting protrusion closest to the center of the opening extends outward from the center of the opening in the radial direction of the opening.

[0016] A further option is to have multiple limiting protrusions and multiple limiting grooves, with the multiple limiting protrusions evenly arranged in the circumferential direction of the opening, and one limiting protrusion located in one limiting groove.

[0017] A further option is that the cross-section of the reinforcing protrusion in the axial direction of the opening is trapezoidal, the wide part of the reinforcing protrusion is connected to the heat exchange plate, and the narrow part of the reinforcing protrusion is away from the plate; and / or, the protrusion height of the reinforcing protrusion is between 0.1 and 0.9 times the protrusion height of the heat exchange protrusion.

[0018] A further option is to strengthen the base angle of the raised trapezoidal cross-section to between 10° and 80°.

[0019] To achieve the second objective of this utility model, this utility model provides a heat exchange system, including a plate heat exchanger, wherein the plate heat exchanger is the aforementioned plate heat exchanger. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the first embodiment of the plate heat exchanger of this utility model.

[0021] Figure 2 This is a partial structural cross-sectional view of the first embodiment of the plate heat exchanger of this utility model.

[0022] Figure 3 This is a partial structural schematic diagram of the first embodiment of the plate heat exchanger of this utility model.

[0023] Figure 4 This is a partial exploded view of the first embodiment of the plate heat exchanger of this utility model.

[0024] Figure 5 This is a front view of the heat exchange plates in the first embodiment of the plate heat exchanger of this utility model.

[0025] Figure 6 This is a partial structural diagram of the heat exchange plates in the first embodiment of the plate heat exchanger of this utility model.

[0026] Figure 7 This is a structural diagram of the distribution ring in the first embodiment of the plate heat exchanger of this utility model.

[0027] Figure 8 This is a partial structural diagram of the heat exchange plates in the second embodiment of the plate heat exchanger of this utility model.

[0028] Figure 9 This is a partial structural diagram of the heat exchange plates in the third embodiment of the plate heat exchanger of this utility model.

[0029] Figure 10 This is a partial structural diagram of the heat exchange plates in the fourth embodiment of the plate heat exchanger of this utility model.

[0030] Figure 11 This is a structural diagram of the distribution ring in the fourth embodiment of the plate heat exchanger of this utility model.

[0031] Figure 12 This is a partial structural diagram of the heat exchange plates in the fifth embodiment of the plate heat exchanger of this utility model.

[0032] Figure 13 This is a partial structural diagram of the heat exchange plates in the sixth embodiment of the plate heat exchanger of this utility model.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0034] First embodiment of plate heat exchanger:

[0035] See Figures 1 to 7 This embodiment discloses a plate heat exchanger 10, including multiple sets of channel structures 13. The multiple sets of channel structures 13 are arranged in the height direction Z of the plate heat exchanger 10. Each set of channel structures 13 includes two heat exchange plates 131. The heat exchange plates 131 are provided with through holes 1313. A welding ring area 1314 is formed around the outer periphery of the holes 1313. The heat exchange area of ​​the heat exchange plates 131 is provided with multiple heat exchange protrusions 1311. The multiple heat exchange protrusions 1311 are arranged in the length direction Y and the width direction X of the plate heat exchanger 10.

[0036] Furthermore, each channel structure 13 in this embodiment also includes a distribution ring 132. The inner ring region 13141 of the welding ring area 1314 near the opening 1313 is provided with a reinforcing protrusion 1312. The distribution ring 132 is sleeved on the outer periphery of the reinforcing protrusion 1312 and is located on the outer ring region 13142 of the welding ring area 1314 far away from the opening 1313. The distribution ring 132 is radially perforated with a plurality of distribution holes 1321, and the plurality of distribution holes 1321 are arranged in the circumferential direction of the distribution ring 132.

[0037] Furthermore, in this embodiment, the reinforcing protrusion 1312 and the heat exchange protrusion 1311 have the same protrusion direction, and the protrusion height H2 of the reinforcing protrusion 1312 is less than the protrusion height H1 of the heat exchange protrusion 1311. In each set of channel structures 13, the heat exchange protrusions 1311 of two adjacent heat exchange plates 131 contact each other to form a fluid channel, and the distribution ring 132 is located between the welding ring areas 1314 of two adjacent heat exchange plates 131 in the height direction Z. The distribution hole 1321 is connected between the distribution hole 1321 and the fluid channel.

[0038] Thus, in each set of channel structures 13 of the plate heat exchanger 10 of this embodiment, the heat exchange protrusions 1311 of two adjacent heat exchange plates 131 contact each other to form a first fluid channel 133, and the distribution ring 132 is located between the welding ring areas 1314 of two adjacent heat exchange plates 131 in the height direction Z of the plate heat exchanger 10. The distribution hole 1321 of the distribution ring 132 communicates between the distribution hole 1321 of the heat exchange plate 131 and the first fluid channel 133. At the same time, in two adjacent sets of channel structures 13 of this embodiment, the plates of the heat exchange plates 131 of the two adjacent sets of channel structures 13 contact each other, and the welding ring areas 1314 of the heat exchange plates 131 of the two adjacent sets of channel structures 13 contact each other to form a second fluid channel 134.

[0039] Specifically, the plate heat exchanger 10 in this embodiment further includes a connector 11, an upper end plate 12, and a lower end plate 14. Copper foil solder is placed at the contact position between the connector 11 and the upper end plate 12, copper foil solder is placed at the contact position between the upper end plate 12 and the heat exchange plates 131 of the adjacent channel structure 13, and copper foil solder is placed at the contact position between the lower end plate 14 and the heat exchange plates 131 of the adjacent channel structure 13. The contact position of the heat exchange protrusions 1311 of two adjacent heat exchange plates 131 is... Copper foil solder is placed at the contact positions of the two ends of the distribution ring 132 and the welding ring areas 1314 of the two adjacent heat exchange plates 131, and at the contact positions of the plates of the heat exchange plates 131 of the two adjacent sets of channel structures 13. Copper foil solder is also placed at the contact positions of the welding ring areas 1314 of the heat exchange plates 131 of the two adjacent sets of channel structures 13. Thus, the copper foil solder is melted at high temperature through vacuum brazing to form an integrated plate heat exchanger 10.

[0040] In this embodiment, a welded ring area 1314 is formed around the outer periphery of the opening 1313 of the heat exchange plate 131 of the plate heat exchanger 10. The welded ring area 1314 is provided with a reinforcing protrusion 1312 near the inner ring area 13141 of the opening 1313, which can effectively enhance the structural strength and compressive strength of the welded ring area 1314 around the opening 1313, so as to avoid deformation and cracking of the opening 1313, thereby effectively eliminating the risk of leakage of fluid medium. Furthermore, in this embodiment, the distribution ring 132 of the plate heat exchanger 10 is sleeved on the outer periphery of the reinforcing protrusion 1312 and located on the outer ring region 13142 of the welded ring region 1314, which is far away from the hole 1313. In each set of channel structures 13, the distribution ring 132 is located between the welded ring regions 1314 of two adjacent heat exchange plates 131 in the height direction Z, and the distribution hole 1321 of the distribution ring 132 is connected between the distribution hole 1321 and the fluid channel. Thus, the multiple distribution holes 1321 arranged in the circumferential direction of the distribution ring 132 can guide and distribute the fluid medium at the opening 1313 to improve the distribution uniformity of the fluid medium and thus improve the heat exchange performance. Furthermore, in this embodiment, the outer peripheral welding ring area 1314 of the opening 1313 includes an inner ring area 13141 with a reinforcing protrusion 1312 and an outer ring area 13142 with a supporting distribution ring 132, thereby increasing the area of ​​the outer peripheral welding ring area 1314 of the opening 1313 to improve the welding sealing performance and effectively eliminate the risk of leakage of fluid medium.

[0041] Therefore, the plate heat exchanger 10 in this embodiment can effectively enhance the structural strength and compressive strength of the outer welded ring area 1314 of the opening 1313, so as to avoid deformation and cracking of the opening 1313, improve the pressure resistance characteristics of the plate heat exchanger 10, thereby effectively eliminating the risk of fluid medium leakage, and at the same time, it can guide and distribute the fluid medium at the opening 1313 to improve the uniformity of fluid medium distribution, thereby improving the heat exchange performance.

[0042] To further improve the structural strength and compressive strength of the outer peripheral welding ring area 1314 of the opening 1313, in this embodiment, the inner ring area 13141 of the outer peripheral welding ring area 1314 of the opening 1313 is provided with a plurality of reinforcing protrusions 1312. The plurality of reinforcing protrusions 1312 are arranged in the circumferential direction of the opening 1313, wherein a positioning groove 1315 is formed between two adjacent reinforcing protrusions 1312 in the circumferential direction of the opening 1313. The inner ring hole of the distribution ring 132 is provided with a positioning part 1322 protruding out. The positioning part 1322 is located in the positioning groove 1315, thereby positioning and limiting the distribution ring 132 to improve the installation accuracy of the distribution ring 132 and thus improve the uniformity of fluid medium distribution. Specifically, in this embodiment, there are two positioning parts 1322 and two positioning grooves 1315. The two positioning parts 1322 are arranged in the circumferential direction of the distribution ring 132, and one positioning part 1322 is adapted to be located in one positioning groove 1315, which further improves the installation accuracy of the distribution ring 132.

[0043] To further improve the structural strength and compressive strength of the outer welded ring area 1314 of the opening 1313, in this embodiment, the reinforcing protrusion 1312 extends in a long strip shape in the radial direction of the opening 1313. Specifically, in this embodiment, the cross-section of the reinforcing protrusion 1312 in the axial direction of the opening 1313 is trapezoidal, with the wide portion of the reinforcing protrusion 1312 connecting to the heat exchange plate 131 and the narrow portion of the reinforcing protrusion 1312 moving away from the heat exchange plate 131. Further, in this embodiment, the base angle of the trapezoidal cross-section of the reinforcing protrusion 1312 is between 10° and 80°, preferably 30°, 35°, 40°, and 45°.

[0044] In order to reduce the resistance effect of the reinforcing protrusion 1312 on the fluid medium, the protrusion height H2 of the reinforcing protrusion 1312 in this embodiment is between 0.1 and 0.9 times the protrusion height H1 of the heat exchange protrusion 1311. Specifically, in this embodiment, the multiple reinforcing protrusions 1312 are arranged in a radial and irregular pattern.

[0045] Second embodiment of plate heat exchanger:

[0046] As an explanation of the second embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the first embodiment of the plate heat exchanger.

[0047] See Figure 8In this embodiment, the reinforcing protrusions 1312' on the outer periphery of the welded ring area 1314 of the opening 1313 of the heat exchange plate 131 extend in a fan shape in the circumferential direction of the opening 1313, and a positioning groove 1315' is formed between two adjacent fan-shaped reinforcing protrusions 1312'. The positioning part 1322 of the distribution ring 132 is located in the positioning groove 1315', thereby positioning and limiting the distribution ring 132 to improve the installation accuracy of the distribution ring 132 and thus improve the uniformity of fluid medium distribution. Furthermore, in this embodiment, the reinforcing protrusions 1312' extend in a fan shape in the circumferential direction of the opening 1313, thereby increasing the area of ​​the reinforcing protrusions 1312' in the circumferential direction of the opening 1313, further enhancing the structural strength and compressive strength of the outer periphery of the welded ring area 1314 of the opening 1313.

[0048] Third embodiment of plate heat exchanger:

[0049] As an explanation of the third embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the first embodiment of the plate heat exchanger.

[0050] See Figure 9 In this embodiment, the reinforcing protrusions 1312" on the outer periphery of the welded ring area 1314 of the opening 1313 of the heat exchange plate 131 have a hexagonal cross-section in the radial direction of the opening 1313. Multiple hexagonal reinforcing protrusions 1312" are arranged circumferentially around the opening 1313, thereby enhancing the structural strength and compressive strength of the outer periphery of the welded ring area 1314 of the opening 1313. Furthermore, a positioning groove 1315" is formed between two adjacent hexagonal reinforcing protrusions 1312" and the positioning part 1322 of the distribution ring 132 is located in the positioning groove 1315" to position and limit the distribution ring 132, thereby improving the installation accuracy of the distribution ring 132 and thus improving the uniformity of fluid medium distribution.

[0051] Fourth embodiment of plate heat exchanger:

[0052] As an explanation of the fourth embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the first embodiment of the plate heat exchanger.

[0053] See Figure 10 and Figure 11 In this embodiment, the outer ring area 13142 of the outer ring area 1314 of the outer periphery of the opening 1313 of the heat exchange plate 131 is provided with a limiting protrusion 1317. The protrusion direction and protrusion height of the limiting protrusion 1317 and the reinforcing protrusion 1316 are the same. The inner ring hole of the distribution ring 132 is provided with a limiting groove 1323. The limiting protrusion 1317 is located in the limiting groove 1323, thereby positioning and limiting the distribution ring 132 to improve the installation accuracy of the distribution ring 132 and thus improve the uniformity of fluid medium distribution.

[0054] Specifically, in this embodiment, the reinforcing protrusion 1316 is arranged in a closed loop around the opening 1313 in the circumferential direction, and the limiting protrusion 1317 is connected to the reinforcing protrusion 1316, so that the circumferential structural strength and compressive strength of the outer peripheral welding ring area 1314 of the opening 1313 are more uniformly distributed, further improving the reinforcement effect.

[0055] Fifth embodiment of plate heat exchanger:

[0056] As an explanation of the fifth embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the fourth embodiment of the plate heat exchanger.

[0057] See Figure 12 In this embodiment, the reinforcing protrusions 1316' on the outer periphery of the welded ring area 1314 of the opening 1313 of the heat exchange plate 131 have a hexagonal cross-section in the radial direction of the opening 1313. Multiple hexagonal reinforcing protrusions 1316' are evenly arranged in the circumferential direction of the opening 1313, making the reinforcement distribution of the circumferential structural strength and compressive strength of the outer periphery of the welded ring area 1314 of the opening 1313 more uniform, and further improving the reinforcement effect.

[0058] Specifically, in this embodiment, the limiting protrusion 1317' on the outer ring area 13142 of the outer ring area 1314 of the outer periphery of the opening 1313 of the heat exchange plate 131 has a hexagonal cross-section in the radial direction of the opening 1313. Multiple hexagonal limiting protrusions 1317' are evenly arranged in the circumferential direction of the opening 1313. One or more hexagonal limiting protrusions 1317' are adapted to the hexagonal limiting groove 1323 of the distribution ring 132, thereby positioning and limiting the distribution ring 132 to improve the installation accuracy of the distribution ring 132 and thus improve the uniformity of fluid medium distribution.

[0059] Sixth embodiment of plate heat exchanger:

[0060] As an explanation of the sixth embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the fourth embodiment of the plate heat exchanger.

[0061] See Figure 13 In this embodiment, there are two closed-loop reinforcing protrusions 1316". The two closed-loop reinforcing protrusions 1316" are arranged in concentric circles with the center of the opening 1313. The end of the limiting protrusion 1317" near the center of the opening 1313 extends radially toward the center of the opening 1313 and protrudes beyond the reinforcing protrusion 1316". This makes the circumferential structural strength and compressive strength of the outer peripheral welding ring area 1314 of the opening 1313 more uniformly distributed, further improving the reinforcement effect.

[0062] Specifically, in this embodiment, there are multiple limiting protrusions 1317" on the outer ring area 13142 of the outer ring area 1314 of the outer periphery of the opening 1313 of the heat exchange plate 131 and multiple limiting grooves 1323 on the distribution ring 132. The multiple limiting protrusions 1317" are evenly arranged in the circumferential direction of the opening 1313, and one limiting protrusion 1317" is located in one limiting groove 1323 for adaptation, which further enhances the circumferential reinforcement effect and further improves the installation accuracy of the distribution ring 132, thereby improving the uniformity of fluid medium distribution.

[0063] The above embodiments are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles of this utility model patent application should be included within the scope of this utility model patent application.

Claims

1. A plate heat exchanger, comprising multiple sets of channel structures arranged in the height direction of the plate heat exchanger, each set of channel structures comprising two heat exchange plates, each heat exchange plate having a through-hole, a welding ring area forming around the outer periphery of the through-hole, and the heat exchange area of ​​the heat exchange plate having multiple heat exchange protrusions arranged in the length and width directions of the plate heat exchanger, characterized in that: Each set of the channel structures further includes a distribution ring. The inner ring area of ​​the welding ring region near the opening is provided with a reinforcing protrusion. The distribution ring is sleeved on the outer periphery of the reinforcing protrusion and located on the outer ring area of ​​the welding ring region away from the opening. The distribution ring is radially perforated with multiple distribution holes, and the multiple distribution holes are arranged in the circumferential direction of the distribution ring. The reinforcing protrusion is aligned with the protrusion direction of the heat exchange protrusion, and the protrusion height of the reinforcing protrusion is less than that of the heat exchange protrusion; in each set of the channel structures, the heat exchange protrusions of two adjacent heat exchange plates contact each other to form a fluid channel, and the distribution ring is located between the welding ring areas of two adjacent heat exchange plates in the height direction, and the distribution hole connects the distribution hole and the fluid channel.

2. The plate heat exchanger according to claim 1, characterized in that: The inner ring region is provided with a plurality of reinforcing protrusions, which are arranged in the circumferential direction of the opening. A positioning groove is formed between two adjacent reinforcing protrusions in the circumferential direction of the opening. The inner ring hole of the distribution ring is provided with a positioning part protruding out, and the positioning part is located in the positioning groove.

3. The plate heat exchanger according to claim 2, characterized in that: The reinforcing protrusion extends in a long strip shape in the radial direction of the opening; Alternatively, the reinforcing protrusion extends in a fan shape in the circumferential direction of the opening; Alternatively, the reinforcing protrusion has a hexagonal cross-section in the radial direction of the opening.

4. The plate heat exchanger according to claim 1, characterized in that: The outer ring area is provided with a limiting protrusion. The protrusion and the reinforcing protrusion have the same protrusion direction and height. The inner ring hole of the distribution ring is provided with a limiting groove, and the limiting protrusion is located in the limiting groove.

5. The plate heat exchanger according to claim 4, characterized in that: The reinforcing protrusion is arranged in a closed loop around the opening in the circumferential direction, and the limiting protrusion is connected to the reinforcing protrusion.

6. The plate heat exchanger according to claim 5, characterized in that: The number of reinforcing protrusions is two, and the two reinforcing protrusions are arranged in a concentric circle with the center of the opening. The end of the limiting protrusion near the center of the opening extends radially toward the center of the opening and protrudes beyond the reinforcing protrusion.

7. The plate heat exchanger according to claim 6, characterized in that: The number of the limiting protrusions and the limiting grooves are both multiple. The multiple limiting protrusions are evenly arranged in the circumferential direction of the opening, and one limiting protrusion is located in one limiting groove.

8. The plate heat exchanger according to any one of claims 1 to 7, characterized in that: The reinforcing protrusion has a trapezoidal cross-section in the axial direction of the opening, the wide part of the reinforcing protrusion is connected to the plate body of the heat exchange plate, and the narrow part of the reinforcing protrusion is away from the plate body; And / or, the height of the reinforcing protrusion is between 0.1 and 0.9 times the height of the heat exchange protrusion.

9. The plate heat exchanger according to claim 8, characterized in that: The base angle of the trapezoidal cross-section of the reinforcing protrusion is between 10° and 80°.

10. A heat exchange system, including a plate heat exchanger, characterized in that: The plate heat exchanger is any one of claims 1 to 9.

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