Heat exchange plate, heat exchanger and manufacturing method of heat exchange plate

Abstract

The embodiment of the invention discloses a heat exchange plate, a heat exchanger and a manufacturing method of the heat exchange plate, the edge portion of the heat exchange plate comprises a concave portion, when the adjacent heat exchange plates are welded and fixed, the concave portion and the adjacent heat exchange plates are welded to form a cavity isolated from the outside, equivalently, a relatively closed space is formed, and for welding of the heat exchange plates, the heat exchange plate is not prone to deformation. A better welding environment can be provided, the problem of insufficient welding can be reduced, and the welding quality of the heat exchanger is improved.

Description

Technical Field

[0001] This application relates to the technical field of heat exchange, and particularly relates to a heat exchange plate, a heat exchanger and a manufacturing method thereof. Background Art

[0002] In the heat exchanger in the related art, the tunnel furnace gas protection brazing technology is the main production method of the heat exchanger at present. Its technological process mainly includes: stamping - degreasing - spraying flux - assembling - brazing. The main function of spraying flux is to remove the aluminum alloy surface oxide film, improve the fluidity of the filler metal, and then achieve brazing. After brazing the plates after spraying flux, there is a problem of false soldering. How to reduce false soldering between the plates of the heat exchanger is an urgent problem to be solved. Summary of the Invention

[0003] The purpose of this application is to provide a heat exchange plate, a heat exchanger and a manufacturing method thereof, which are beneficial to reducing the problem of false soldering and improving the welding quality of the heat exchanger.

[0004] To achieve the above purpose, an embodiment of this application adopts the following technical solution: A heat exchanger includes two or more heat exchange plates stacked. The heat exchange plate includes a base and a side portion. The side portion is bent relative to the base. At least one of the side portions of two adjacent heat exchange plates includes a recess. The inner side wall and / or the outer side wall of the side portion includes a first wall. The recess is recessed relative to the first wall. The heat exchanger has a cavity. The cavity is located between adjacent heat exchange plates. The wall defining the cavity includes the wall of the recess. The cavity is isolated from the outside.

[0005] The embodiment of this application discloses a heat exchanger. By providing a recess in the heat exchange plate, a cavity isolated from the outside is formed between adjacent heat exchange plates. The wall of the cavity includes the wall of the recess. At this time, a relatively closed space is formed between adjacent heat exchange plates. Through the above setting, during the welding process of the heat exchange plates, a better welding environment can be provided, which is beneficial to reducing the problem of false soldering and improving the welding quality of the heat exchanger.

[0006] Another embodiment of this application also adopts the following technical solution: A heat exchange plate includes a base and a side portion. The side portion is bent relative to the base. The side portion includes a recess. The inner side wall and / or the outer side wall of the side portion includes a first wall. The recess is recessed relative to the first wall.

[0007] Embodiments of the present application disclose a heat exchange plate. By providing a recessed portion on the heat exchange plate, a cavity isolated from the outside is formed between the assembled heat exchange plates. The wall of this cavity includes the wall of the recessed portion. At this time, a relatively enclosed space is formed between adjacent heat exchange plates. Through the above arrangement, during the welding process of the heat exchange plates, a better welding atmosphere can be provided, which is beneficial to reducing the problem of false soldering and improving the welding quality of the heat exchanger.

[0008] One embodiment of the present application also adopts the following technical solution: A manufacturing method of a heat exchanger, providing heat exchange plates, the edges of the heat exchange plates having recessed portions; assembling the heat exchange plates to form a heat exchange structure, the heat exchange structure having a cavity located between adjacent heat exchange plates, and the wall defining the cavity including the wall of the recessed portion; brazing the heat exchange structure to isolate the cavity from the outside and fix adjacent heat exchange plates.

[0009] Embodiments of the present application disclose a manufacturing method of a heat exchanger. The edges of the heat exchange plates include recessed portions. When adjacent heat exchange plates are welded and fixed, the recessed portions are welded to adjacent heat exchange plates to form a cavity isolated from the outside, which is equivalent to forming a relatively enclosed space. For the welding of heat exchange plates, a better welding environment can be provided, which is beneficial to reducing the problem of false soldering and improving the welding quality of the heat exchanger. Brief Description of the Drawings

[0010] Figure 1 is a partial cross-sectional schematic view of the heat exchanger in the background art;

[0011] Figure 2 is a three-dimensional structural schematic view of the heat exchange plate in this embodiment;

[0012] Figure 3 is a three-dimensional structural schematic view of one embodiment of the heat exchange plate;

[0013] Figure 4 is a three-dimensional structural schematic view of another embodiment of the heat exchange plate;

[0014] Figure 5 is a partial cross-sectional schematic view of the heat exchange plate in this embodiment;

[0015] Figure 6 is a partial cross-sectional schematic view of the heat exchange plate in another embodiment;

[0016] Figure 7 is Figure 5 a partial enlarged schematic view at A;

[0017] Figure 8 is a partial cross-sectional schematic view of the heat exchange plate in yet another embodiment;

[0018] Figure 9It is a partial sectional view schematic diagram of a heat exchange plate in another embodiment;

[0019] Figure 10 It is a partial sectional view schematic diagram of a heat exchanger in this embodiment;

[0020] Figure 11 It is Figure 10 A partial enlarged view schematic diagram at B;

[0021] Figure 12 It is a partial sectional view schematic diagram of a heat exchanger in another embodiment;

[0022] Figure 13 It is a partial sectional view schematic diagram of a heat exchanger in yet another embodiment;

[0023] Figure 14 It is Figure 13 A partial enlarged view schematic diagram at C;

[0024] Figure 15 It is a partial sectional view schematic diagram of a heat exchanger in another embodiment;

[0025] Figure 16 It is a partial sectional view schematic diagram of a heat exchanger in yet another embodiment.

[0026] 1. Heat exchange plate; 1a. Opening; 11. Base; 12. Side; 121a. First wall; 122a. Second wall; 122b. Third wall; 123. Inner wall; 124. Outer wall; 125. Depression; 126. Cavity; 131. Contact portion; 132. Matching portion; 2. Heat exchanger; 21. First plate; 211. First depression; 22. Second plate; 221. Second depression. Specific embodiments

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] In the heat exchanger disclosed in the related art, referring to Figure 1 , the heat exchanger includes a plurality of heat exchange plates 1', the heat exchange plates 1' include a base 11' and a side 12', the side 12' is bent relative to the base 11', and the side 12' is an outer peripheral cone inclined outward relative to the base 11'. When the heat exchange plates 1' are assembled, the heat exchange plates 1' are stacked, and the heat exchange structure pre-coated with a brazing agent is placed in a welding device, and adjacent heat exchange plates 1' are welded and fixed. There is a gap between the sides 12' of adjacent heat exchange plates 1', and the solder in the weld is in contact with the external environment, and there is an easy problem of virtual welding between adjacent heat exchange plates 1'.

[0029] Referring to Figures 2 - 11, an embodiment of the present application discloses a heat exchange plate 1, which includes a base 11 and a side portion 12. The side portion 12 is bent relative to the base 11, and the side portion 12 forms an outwardly inclined outer peripheral cone relative to the base 11, with an opening 1a formed on one side, and the opening 1a is a flared opening. The side portion 12 includes a recessed portion 125, and the inner side wall 123 and / or the outer side wall 124 of the side portion 12 includes a first wall 121a. The recessed portion 125 is recessed relative to the first wall 121a, and the recessed portion 125 is used to form a cavity 126 with an adjacent external heat exchange plate, and the cavity 126 is isolated from the outside.

[0030] Referring to Figures 5 - 8 , the inner side wall 123 and / or the outer side wall 124 of the side portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the wall where the base 11 is located. Define the extending direction of the first wall 121a in the height direction as the first direction. Along the first direction, the second wall 122a is located between the first wall 121a and the third wall 122b. One end of the second wall 122a is connected to the first wall 121a, and the other end of the second wall 122a is connected to the third wall 122b. Define the angle between the first direction and the horizontal plane as α, define the angle between the second wall 122a or the tangent direction of the arc surface where the second wall 122a is located and the horizontal plane as β, and define the angle between the third wall 122b or the tangent direction of the arc surface where the third wall 122b is located and the horizontal plane as ε. It should be noted that both β and ε are the angles of the recessed portion facing the center of the arc surface. There is α < β and α > ε, where 0° < β < 180° and 0° < ε < 180°.

[0031] That is, the angle between the height extending direction of the first wall 121a and the horizontal plane is greater than the angle between the second wall 122a or the tangent direction of the arc surface where the second wall 122a is located and the horizontal plane. The second wall 122a forms a recess relative to the first wall 121a. Since the second wall 122a can be a plane or an arc surface, when the second wall 122a is a plane, β is the angle between the second wall 122a and the horizontal plane. When the second wall 122a is an arc surface, β is the angle between the tangent direction of any point on the second wall 122a and the horizontal plane. When the second wall 122a is an arc surface, ε is the angle between the tangent direction of any point on the third wall 122b and the horizontal plane.

[0032] Specifically, there are at least three embodiments included here:

[0033] Referring to Figure 5 and Figure 7 , in one embodiment, the recessed portion 125 is recessed relative to the inner side wall 123, and the inner side wall 123 of the side portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the inner bottom wall of the base 11;

[0034] Referring to Figure 6 ,Figure 13 and Figure 14 , in another embodiment, the recessed portion 125 is recessed relative to the outer side wall 124. The outer side wall 124 of the edge portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the outer bottom wall of the base portion 11;

[0035] Referring to Figure 9 , in other embodiments, the first wall 121a may be located on both the inner side wall 123 and the outer side wall 124, that is, there is at least one recessed portion 125 located inside the edge portion 12, forming a recess relative to the first wall 121a, and there is at least one recessed portion 125 located outside the edge portion 12, forming a recess relative to the first wall 121a.

[0036] Optionally, when the recessed portion 125 is recessed relative to the inner side wall 123 of the edge portion 12, β>90° and ε>90°. That is, the angle between the first wall 121a and the horizontal plane is greater than 90°, and the angle between the second wall 122a and the horizontal plane is also greater than 90°. In some embodiments, the heat exchange plate 1 is usually formed by a mold, such as stamping. An opening 1a is formed by bending one side of the edge portion 12 of the heat exchange plate 1. Therefore, during the processing, demolding is usually performed from the opposite direction of the opening 1a side. The angles between the first wall 121a and the second wall 122a and the horizontal plane are greater than 90°, which is beneficial to the rapid demolding of the heat exchange plate 1, reduces deformation during demolding, and is beneficial to improving product quality. In other embodiments, the heat exchange plate 1 may also be formed by other methods. It should be noted that the horizontal plane here is referenced by the extension direction of the base portion 11 and does not change with the shape or placement position of the heat exchange plate 1. β and ε here can be fixed values, and when the second wall 122a and the third wall 122b are arc surfaces, β and ε can also be variable values. Optionally, α is 110° and ε is 95°.

[0037] Define the direction perpendicular to the first wall 121a as the second direction, which also represents the thickness direction of the edge portion 12. It should be noted that the second wall 122a and the third wall 122b are recessed relative to the first wall 121a with reference to the second direction and the highest height of the first wall 121a, that is, the second wall 122a and the third wall 122b are recessed at least relative to the highest point of the first wall 121a in the second direction. After stacking the heat exchange plates 1, at least a part of another heat exchange plate 1 is located in the opening 1a of one heat exchange plate 1. A cavity 126 is formed between the recessed portion 125 of the heat exchange plate 1 and the adjacent heat exchange plate 1. The cavity 126 is isolated from the outside. Under the brazing process, a suitable atmosphere for brazing is formed in the cavity 126, which can reduce the occurrence of false soldering and improve the welding quality.

[0038] Referring to Figure 10 and Figure 13, the heat exchange plate 1 includes an abutting portion 131 and a mating portion 132. The abutting portion 131 and the mating portion 132 are located on both sides of the edge portion 12 in the thickness direction. The abutting portion 131 is located on the circumferential side of the recessed portion 125. The heat exchange plate 1 and the adjacent external plates are stacked, and the mating portion 132 can abut against the abutting portion 131 of the adjacent heat exchange plate and be welded and fixed.

[0039] Referring to Figure 3 , in some embodiments, the recessed portion 125 surrounds the entire circumference along the circumferential direction of the edge portion 12. In this embodiment, the four edges of the edge portion 12 are bent relative to the base portion 11, the edge portion 12 surrounds the base portion 11, and the extending direction of the length of the edge portion 12 is its circumferential direction. In other embodiments, it includes but is not limited to this structure. Along the extending direction of the height of the edge portion 12, the abutting portion 131 is located on both sides of the recessed portion 125. The abutting portion 131 can be welded and fixed to the external heat exchange plate 1 to enclose the recessed portion 125 and form a cavity 126 isolated from the outside. It should be noted that here the recessed portion 125 surrounds the entire circumference along the circumferential direction of the edge portion 12. Here, the recessed portion 125 can partially surround the circumferential direction of the edge portion 12 or completely surround the circumferential direction of the edge portion 12, and the recessed portion 125 can be connected end to end after surrounding.

[0040] Referring to Figure 4 , in some other embodiments, there are two or more recessed portions 125 arranged at intervals. The recessed portions 125 are not arranged in a surrounding manner in the circumferential direction of the edge 12, or in other words, the surrounding ends of the recessed portions 125 are not connected. At this time, the abutting portion 131 surrounds the recessed portion 125 to enclose the recessed portion 125 and form a cavity 126 isolated from the outside.

[0041] During the welding process, a welding structure is formed on the side of the abutting portion 131 close to the recessed portion 125. Since the cavity 126 is isolated from the outside, a better welding environment is provided, which is beneficial to reducing virtual welding and further improving the welding quality.

[0042] When assembling the heat exchanger 2, it is necessary to stack the heat exchange plates 1. The edge of the recessed portion 125 can be attached to the adjacent heat exchange plate 1, and the recessed portion 125 and the wall of the adjacent heat exchange plate 1 form a cavity 126.

[0043] One embodiment of the present application also discloses a heat exchanger 2. Referring to Figures 10 - 16, the heat exchanger 2 includes two or more heat exchange plates 1 stacked to form a heat exchange fluid passage. The heat exchange plate 1 includes a base 11 and a side portion 12. The side portion 12 is bent relative to the base 11. At least one of the side portions 12 of two adjacent heat exchange plates 1 includes a recess 125. The inner side wall 123 and / or the inner side wall 124 of the side portion 12 includes a first wall 121a, and the recess 125 is recessed relative to the first wall 121a. The heat exchanger 2 has a cavity 126 located between adjacent heat exchange plates 1. The wall defining the cavity 126 includes the wall of the recess 125 and the outer side wall 124 of the adjacent heat exchange plate 1, or the wall of the recess 125 and the inner side wall 123 of the adjacent heat exchange plate 1, or the recesses 125 of two adjacent heat exchange plates 1 enclose.

[0044] The abutting portion 131 can be one or more. The recess surrounds the entire circumference along the circumferential direction of the side portion. Along the extending direction of the height of the side portion, the abutting portion is located on both sides of the recess; or, two or more recesses are arranged at intervals, and the abutting portion surrounds the recess. The abutting portion 131 of the heat exchange plate 1 abuts against the mating portion 132 of the adjacent heat exchange plate 1 to form a cavity 126 isolated from the outside. Under the brazing process, an atmosphere suitable for brazing is formed in the cavity 126, which can reduce the situation of false soldering and improve the welding quality.

[0045] Refer to Figures 5 - 8 , the inner side wall 123 and / or the outer side wall 124 of the side portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the wall where the base 11 is located. Define the extending direction of the first wall 121a in the height direction as the first direction. Along the first direction, the second wall 122a is located between the first wall 121a and the third wall 122b. One end of the second wall 122a is connected to the first wall 121a, and the other end of the second wall 122a is connected to the third wall 122b. Define the angle between the first direction and the horizontal plane as α, the angle between the tangent direction of the second wall 122a or the arc surface where the second wall 122a is located and the horizontal plane as β, and the angle between the tangent direction of the third wall 122b or the arc surface where the third wall 122b is located and the horizontal plane as ε. It should be noted that both β and ε are the angles of the recess facing the center of the arc surface. There is α < β, α > ε, where 0° < β < 180°, 0° < ε < 180°.

[0046] That is, the angle between the height extension direction of the first wall 121a and the horizontal plane is greater than the angle between the tangent direction of the second wall 122a or the arc surface where the second wall 122a is located and the horizontal plane. The second wall 122a forms a recess relative to the first wall 121a. Since the second wall 122a can be a plane or an arc surface, when the second wall 122a is a plane, β is the angle between the second wall 122a and the horizontal plane. When the second wall 122a is an arc surface, β is the angle between the tangent direction of any point of the second wall 122a and the horizontal plane.

[0047] Specifically, at least three implementation manners are included here:

[0048] Referring to Figure 5 and Figure 7 , in one implementation manner, the recessed portion 125 is recessed relative to the inner side wall 123. The inner side wall 123 of the side portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the inner bottom wall of the base portion 11;

[0049] Referring to Figure 6 , Figure 13 and Figure 14 , in another implementation manner, the recessed portion 125 is recessed relative to the outer side wall 124. The outer side wall 124 of the side portion 12 includes a first wall 121a, a second wall 122a, and a third wall 122b. The first wall 121a is connected to the outer bottom wall of the base portion 11;

[0050] Referring to Figure 9 , in other implementation manners, the first wall 121a can be located on both the inner side wall 123 and the outer side wall 124. That is, there is at least one recessed portion 125 located inside the side portion 12, forming a recess relative to the first wall 121a, and there is also at least one recessed portion 125 located outside the side portion 12, forming a recess relative to the first wall 121a.

[0051] Optionally, when the recessed portion 125 is recessed relative to the inner side wall 123 of the side portion 12, β>90° and ε>90°. That is, the included angle between the first wall 121a and the horizontal plane is greater than 90°, and the included angle between the second wall 122a and the horizontal plane is also greater than 90°. In some implementation manners, the heat exchange plate 1 is usually formed by a mold, such as stamping. An opening 1a is formed by bending one side of the side portion 12 of the heat exchange plate 1. Therefore, during the processing, demolding is usually performed from the opposite direction of the opening 1a side. The included angles between the first wall 121a and the second wall 122a and the horizontal plane are greater than 90°, which is beneficial to the rapid demolding of the heat exchange plate 1, reduces deformation during the demolding process, and is beneficial to improving product quality. In other implementation manners, the heat exchange plate 1 can also be formed by other methods. It should be noted that the horizontal plane here is referenced by the extending direction of the base portion 11 and does not change with the shape or placement position of the heat exchange plate 1. Here, β and ε can be fixed values. When the second wall 122a and the third wall 122b are arc surfaces, β and ε can also be variable values. Optionally, α is 110° and ε is 95°.

[0052] Define the direction perpendicular to the first wall 121a as the second direction, which also refers to the thickness direction of the edge portion 12. It should be noted that the second wall 122a and the third wall 122b are recessed relative to the first wall 121a. Taking the second direction as a reference, the highest height of the first wall 121a is used, that is, the second wall 122a and the third wall 122b are recessed at least relative to the highest point of the first wall 121a in the second direction. After the heat exchange plates 1 are stacked, at least a part of another heat exchange plate 1 is located in the opening 1a of one heat exchange plate 1. A cavity 126 is formed between the recessed portion 125 of the heat exchange plate 1 and the adjacent heat exchange plate 1. The cavity 126 is isolated from the outside. Under the brazing process, an atmosphere suitable for brazing is formed in the cavity 126, which can reduce the situation of false soldering and improve the welding quality.

[0053] Refer to Figure 10 and Figure 14 , the heat exchange plate 1 includes a contact portion 131 and a mating portion 132. The contact portion 131 of the heat exchange plate 1 can be in contact with the mating portion of the adjacent heat exchange plate 1 and be welded and fixed.

[0054] Refer to Figure 8 , Figure 9 and Figure 16 , in some embodiments, the recessed portion 125 surrounds the entire circumference along the circumferential direction of the edge portion 12. In this embodiment, the four edges of the edge portion 12 are bent relative to the base portion 11, and the edge portion 12 surrounds the base portion 11. The extending direction of the length of the edge portion 12 is its circumferential direction. In other embodiments, it includes but is not limited to this structure. Along the extending direction of the height of the edge portion 12, the contact portions 131 are located on both sides of the recessed portion 125. The contact portions 131 are welded and fixed to the external heat exchange plate 1 to enclose the recessed portion 125 and form a cavity 126 isolated from the outside. It should be noted that here it surrounds the entire circumference along the circumferential direction of the edge portion 12. Here, the recessed portion 125 can partially surround the circumferential direction of the edge portion 12 or completely surround the circumferential direction of the edge portion 12, as long as the recessed portion 125 is connected at the end after surrounding.

[0055] Refer to Figure 4 , Figure 8 , Figure 9 and Figure 16 , in some other embodiments, there are two or more recessed portions 125 arranged at intervals. The recessed portions 125 are not arranged in a circumferential manner along the edge 12, or in other words, the circumferential ends of the recessed portions 125 are not connected. At this time, the contact portions 131 surround the recessed portions 125 to enclose the recessed portions 125 and form a cavity 126 isolated from the outside.

[0056] During the welding process, a welding structure is formed on the side of the contact portion 131 close to the recessed portion 125. Since the cavity 126 is isolated from the outside, a better welding environment is provided, which is beneficial to reducing false soldering and further improving the welding quality.

[0057] When assembling the heat exchanger 2, the heat exchange plates 1 need to be stacked, and the edge of the recess 125 can be attached to the adjacent heat exchange plate 1, and the recess 125 and the wall of the adjacent heat exchange plate 1 form a cavity 126.

[0058] Specifically, several embodiments may be included as follows:

[0059] Referring to Figure 10 and Figure 11 In one embodiment, the inner side wall 123 of the side portion 12 includes a first wall 121a, the recess 125 is recessed relative to the first wall 121a, and several substantially identical heat exchange plates 1 are stacked to form a heat exchange fluid channel. At least a part of the side portions of the adjacent heat exchange plates 1 are attached to each other, and the opposite sides of the adjacent heat exchange plates 1 respectively have an abutting portion 131 and a mating portion 132, and at least a part of the abutting portion 131 is located at the end of the side portion 12 of the heat exchange plate 1. The mating portion 132 of the heat exchange plate 1 is welded and fixed to the abutting portion 131 of the adjacent heat exchange plate 1 below. A cavity 126 is formed between the adjacent heat exchange plates 1, and the cavity 126 is isolated from the outside. It should be noted that the substantially identical heat exchange plates 1 here refer to the heat exchange plates 1 with at least the same recess 125. Using the same heat exchange plates 1 here is beneficial to simplifying the processing steps and improving the processing efficiency.

[0060] Referring to Figure 12 In other embodiments, the heat exchange plate 1 includes a first plate 21 and a second plate 22, the second plate 22 includes a recess 125, the inner side wall 123 of the side portion 12 of the second plate 22 includes a first wall 121a, the recess 125 is recessed relative to the first wall 121a, and along the thickness direction of the heat exchange plate 1, the first plate 21 and the second plate 22 are alternately stacked to form a heat exchange fluid channel. The opening 1a formed by the recess 125 faces the first plate 21, and the edge of the recess 125 abuts against the first plate 21. Here, the first plate 21 may not have a recess 125, that is, the mating portion 132 of the first plate 21 and the abutting portion 131 of the second plate 22 are welded and fixed, and the plane where the outer side wall 124 of the first plate 21 and the recess 125 of the second plate 22 enclose a cavity 126, and the cavity 126 is isolated from the outside. The structure of the first plate 21 here is simple, and the processing steps are simplified compared with the second plate 22.

[0061] Referring to Figure 13 and Figure 14, in other embodiments, the heat exchange plate 1 includes a first plate 21 and a second plate 22. The first plate 21 includes a recess 125. The outer wall 124 of the edge portion 12 of the first plate 21 includes a first wall 121a. The recess 125 is recessed relative to the first wall 121a. Along the thickness direction of the heat exchange plate 1, the first plate 21 and the second plate 22 are alternately stacked to form a heat exchange fluid channel. Different from the previous embodiment, in this embodiment, the first wall 121a is located on the outer wall 124 of the edge portion 12 where the first plate 21 is located, and the recess 125 is recessed relative to the first wall 121a. The second plate 22 here may not have a recess 125, that is, the abutting portion 131 of the first plate 21 and the mating portion 132 of the second plate 22 are welded and fixed. The plane where the outer wall 124 of the first plate 21 is located and the recess 125 of the second plate 22 enclose a cavity 126, and the cavity 126 is isolated from the outside.

[0062] Referring to Figure 15 , in other embodiments, the heat exchange plate 1 includes a first plate 21 and a second plate 22. The first plate 21 includes a first recess 211, and the second plate 22 includes a second recess 221. The first recess 211 and the second recess 221 are oppositely arranged. Stacking the first plate 21 and the second plate 22, the first recess 211 and the second recess 221 enclose a cavity 126, and the cavity 126 is isolated from the outside. In other embodiments, along the first direction, the first recess 211 and the second recess 221 may also be arranged in a staggered manner. The first recess 211 and the second plate 22 enclose a first cavity 126, and the second recess 221 and the first plate 21 enclose a second cavity 126. There can be multiple embodiments here and will not be elaborated further.

[0063] Referring to Figure 16 , some other embodiments may further include that the abutting portion 131 is closer to the recess 125 than the end of the edge portion 12. Along the first direction, the end of the edge portion 12 is farther from the recess 125 than the base portion 11. In this embodiment, the outer edge of the recess 125 protrudes toward the opening 1a side relative to the end of the edge portion 12, and this protruding portion is used to abut against an adjacent heat exchange plate 1 to form a relatively closed chamber. No specific structure is limited here.

[0064] It should be noted that the thickness direction of the edge portion 12 of the heat exchange plate 1 mentioned above refers to the stacking direction of the heat exchange plates 1, and no specific structure of the heat exchange plate 1 is limited.

[0065] An embodiment of the present application also discloses a manufacturing method of a heat exchanger 2:

[0066] Provide a heat exchange plate 1, and the edge portion 12 of the heat exchange plate 1 has a recess 125;

[0067] Assemble the heat exchange plate 1 to form a heat exchange structure. The heat exchange structure has a cavity 126, and the cavity 126 is located between adjacent heat exchange plates 1. The wall defining the cavity 126 includes the wall of the recess 125;

[0068] Brazeweld the heat exchange structure to isolate the cavity 126 from the outside world and fix the adjacent heat exchange plates 1.

[0069] In other embodiments, the manufacturing method of the heat exchanger 2 further includes:

[0070] Before or after assembling the heat exchange plate 1, cover a brazing flux on the surface of the heat exchange plate 1.

[0071] Covering a brazing flux on the surface of the heat exchange plate 1 can remove the oxide film on the metal surface, improve the fluidity of the brazing filler metal, and thus improve the brazing quality. In other embodiments, the brazing flux can also be used as an embedded material, etc., which is not limited here.

[0072] Specifically, when assembling the heat exchange plate 1, a cavity 126 is formed between adjacent heat exchange plates 1. In some embodiments, a brazing flux can be pre-covered on the surface of the heat exchange plate 1. When the heat exchange structure is placed in a welding device for heating, the brazing flux on the surface of the heat exchange plate 1 melts, and the contact between the recess 125 of the heat exchange plate 1 and the adjacent heat exchange plate 1 is welded and fixed. A cavity 126 isolated from the outside world is formed between the recess 125 and the adjacent heat exchange plate 1 to provide a better welding environment, which is beneficial to reducing the problem of false soldering and improving the welding quality of the heat exchanger 2.

[0073] The welding device here can be a brazing furnace or other devices capable of heating and welding the heat exchange plate 1, which is not limited here. In other embodiments,

[0074] It should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent replacements. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered within the scope of the claims of the present invention.

Claims

1. A heat exchanger (2), characterized in that: It includes two or more heat exchange plates (1) arranged in a stacked manner. The heat exchange plate (1) includes a base (11) and a side portion (12). The side portion (12) is bent relative to the base (11). At least one of the side portions (12) of two adjacent heat exchange plates (1) includes a recess (125). The inner wall (123) and / or the outer wall (124) of the side portion (12) includes a first wall (121a). The recess (125) is recessed relative to the first wall (121a). The heat exchanger (2) has a cavity (126). The cavity (126) is located between adjacent heat exchange plates (1). The wall defining the cavity (126) includes the wall of the recess (125). The cavity (126) is isolated from the outside.

2. The heat exchanger (2) according to claim 1, characterized in that: The heat exchange plate (1) includes a contact portion (131) and a mating portion (132). The contact portion (131) and the mating portion (132) are located on both sides in the thickness direction of the side portion (12). The contact portion (131) is located on the circumferential side of the recess (125). The mating portion (132) is fixedly welded to the contact portion (131) of the adjacent heat exchange plate (1).

3. The heat exchanger (2) according to claim 2, characterized in that: The recess (125) surrounds the entire circumference along the circumferential direction of the side portion (12). Along the extending direction of the height of the side portion (12), the contact portion (131) is located on both sides of the recess (125); or, two or more recesses (125) are arranged at intervals, and the contact portion (131) surrounds the recess (125).

4. The heat exchanger (2) according to any one of claims 1-3, characterized in that: The recess (125) includes a second wall (122a). The second wall (122a) connects the first wall (121a). Define the included angle between the height extending direction of the first wall (121a) and the horizontal plane as α, and define the included angle between the tangent direction of the second wall (122a) or the arc surface where the second wall (122a) is located and the horizontal plane as β; wherein, α < β.

5. The heat exchanger (2) according to claim 4, characterized in that: The recess (125) includes a third wall (122b). Along the extending direction of the height of the side portion (12), one end of the second wall (122a) is connected to the first wall (121a), and the other end of the second wall (122a) is connected to the third wall (122b). Define the included angle between the tangent direction of the arc surface where the third wall (122b) is located and the horizontal plane as ε; wherein, α > ε.

6. The heat exchanger (2) according to claim 5, characterized in that: When the recess (125) is recessed relative to the inner wall (123) of the side portion (12), β > 90°, ε > 90°.

7. A heat exchange plate (1), characterized in that: It includes a base (11) and a side portion (12). The side portion (12) is bent relative to the base (11). The side portion (12) includes a recess (125). The inner wall (123) and / or the outer wall (124) of the side portion (12) includes a first wall (121a). The recess (125) is recessed relative to the first wall (121a).

8. The heat exchange plate (1) according to claim 7, characterized in that: The heat exchange plate (1) includes a contact portion (131) and a mating portion (132). The contact portion (131) and the mating portion (132) are located on both sides of the edge portion (12) in the thickness direction. The contact portion (131) is located on the circumferential side of the recessed portion (125). The mating portion (132) is welded and fixed to the contact portion (131) of the adjacent heat exchange plate (1).

9. A manufacturing method of a heat exchanger (2), characterized in that: providing a heat exchange plate (1), the edge portion (12) of the heat exchange plate (1) having a recessed portion (125); assembling the heat exchange plates (1) to form a heat exchange structure having a cavity (126) located between adjacent heat exchange plates (1), and the wall defining the cavity (126) includes the wall of the recessed portion (125); brazing the heat exchange structure to isolate the cavity (126) from the outside and fix adjacent heat exchange plates (1).

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