Diffusion-welded heat exchanger and design method therefor

Abstract

Disclosed in the present application are a diffusion-welded heat exchanger and a design method therefor, the diffusion-welded heat exchanger comprising several stacked heat exchange plates, wherein a heat exchange flow channel is provided in each heat exchange plate; an engagement cavity is further provided in each heat exchange plate, engagement cavities in every two adjacent heat exchange plates mutually fit to form an engagement groove; an engagement plate is provided in each engagement groove; and the inner walls of the engagement grooves are attached to and abut against the outer walls of the engagement plates in a stacking direction of the heat exchange plates. Further disclosed in the present application is the corresponding design method, which comprises: firstly, calculating the inherent welding area between every two adjacent heat exchange plates on the basis of the dimensional parameters of the heat exchange flow channels; then determining a total welding area ratio and a total welding area, calculating an extended welding area on the basis of the total welding area and the inherent welding area; and finally designing the shape and dimensional parameters of the engagement plates on the basis of the extended welding area. In the present application, the contact area between the heat exchange plates is increased by means of the engagement grooves, thereby increasing the welding area during diffusion welding, improving the welding strength, and facilitating the reduction in a spacing between the adjacent heat exchange flow channels, and thus the compactness of the whole heat exchanger is improved.

Description

A diffusion bonding heat exchanger and its design method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 15, 2023, with application number 2023115222850 and application name “A Diffusion Bonding Heat Exchanger and Its Design Method”, the entire contents of which are incorporated by reference into the application. Technical Field

[0002] The present application relates to the field of forging processing technology, and in particular to a diffusion welding heat exchanger and a design method thereof. Background Art

[0003] The heat exchangers currently used in conventional industrial fields mainly include shell and tube heat exchangers, double-tube heat exchangers, plate heat exchangers, and plate-fin heat exchangers. These cannot simultaneously meet the requirements of large heat transfer surface area, high welding strength, and small size. In recent years, with the improvement of industrial manufacturing levels, microchannel heat exchangers, which use high-precision chemical etching and vacuum diffusion welding as their core processes, have gradually entered the application stage. Their microchannels are small in size and highly compact, and the welding method is slag-free, and the joint strength is close to that of the parent material, which has obvious advantages.

[0004] However, during the welding process of such heat exchangers, in order to ensure welding quality and heat exchanger strength, the contact area between the heat exchange plates cannot be too small, which limits the compactness of the flow channels on the heat exchange plates and the compactness of the heat exchanger cannot be further improved.

[0005] Application Contents

[0006] The main purpose of this application is to provide a diffusion bonding heat exchanger and a design method thereof, aiming to solve the defect of low compactness in the prior art.

[0007] This application achieves the above objectives through the following technical solutions:

[0008] A diffusion welding heat exchanger comprises a plurality of heat exchange plates, each of which is provided with a heat exchange channel, and the heat exchange plates are stacked on each other;

[0009] A bite groove, the bite groove comprising two mutually connected bite cavities, the two bite cavities being respectively arranged on two adjacent heat exchange plates;

[0010] The bite plate is inserted into the bite groove, and along the stacking direction of each heat exchange plate, the inner wall of the bite groove and the outer wall of the bite plate are in contact with each other.

[0011] Optionally, the two engaging cavities are simultaneously arranged on the top surface or the bottom surface of the heat exchange plate.

[0012] Optionally, the two engaging cavities are respectively arranged on the top surface and the bottom surface of the heat exchange plate.

[0013] Optionally, the bite groove has a U-shaped, S-shaped or Z-shaped structure.

[0014] Optionally, the heat exchange flow channel includes a plurality of first heat exchange flow channels and / or a plurality of second heat exchange flow channels, and the flow areas of the first heat exchange flow channels are different from those of the second heat exchange flow channels.

[0015] Optionally, a temperature measuring hole is provided on the bite plate along the length direction of the bite plate, and a temperature sensor is provided in the temperature measuring hole.

[0016] Accordingly, the present application also discloses a design method for the above-mentioned diffusion bonding heat exchanger, comprising the following steps:

[0017] Determining the size parameters of each heat exchange channel, and calculating the inherent welding area between two adjacent heat exchange plates based on the size parameters;

[0018] determining a total weld area ratio, and calculating a total weld area based on the total weld area ratio;

[0019] Calculating an extended welding area based on the total welding area and the inherent welding area;

[0020] Acquiring a set of shape structure and size parameters of the bite plate according to the extended welding area;

[0021] One of the size parameter sets is selected as the size parameter of the bite plate.

[0022] Optionally, the inherent welding area satisfies the following calculation formula: S0=A-amL; wherein A represents the surface area of ​​the heat exchange plate; a represents the cross-sectional width of the heat exchange channel; L represents the length of the heat exchange channel, and m represents the number of the heat exchange channels.

[0023] Optionally, the total welding area ratio satisfies the relationship n>n0, and the calculation formula of the total welding area is S=n*A; wherein n represents the total welding area ratio, and n0 represents the safety threshold of the total welding area ratio; the calculation formula of the extended welding area is ΔS=S-S0.

[0024] Optionally, obtaining a set of shape structure and size parameters of the bite plate according to the extended welding area includes the following steps:

[0025] Determining the outer shape of the bite plate;

[0026] Determining a first constraint condition based on the extended welding area and the external structure;

[0027] Determining a second constraint condition based on the shape, structure and strength requirements of the bite plate;

[0028] Determining a third constraint condition according to the size parameters of the heat exchange plate and the heat exchange channel;

[0029] The size parameter set is determined according to the first constraint condition, the second constraint condition, and the third constraint condition.

[0030] Compared with the prior art, this application has the following beneficial effects:

[0031] The present application includes a plurality of heat exchange plates, each of which is provided with a heat exchange flow channel, and the heat exchange plates are stacked together; the heat exchange plates are also provided with bite cavities, and the bite cavities on two adjacent heat exchange plates are spliced ​​together to form a bite groove; the heat exchanger also includes a bite plate, which is inserted into the bite groove, and at the same time, along the stacking direction of the heat exchange plates, the inner wall of the bite groove and the outer wall of the bite plate are in contact with each other;

[0032] Correspondingly, the present application also discloses a design method for the above-mentioned heat exchanger, which includes first determining the size parameters of each heat exchange channel, calculating the inherent welding area between two adjacent heat exchange plates based on the size parameters, then determining the total welding area ratio, and calculating the total welding area based on the total welding area ratio; then calculating the extended welding area based on the total welding area and the inherent welding area, and finally designing the shape and size parameters of the bite plate based on the extended welding area;

[0033] Compared with the existing technology, the setting of the bite groove and the bite plate can effectively improve the connection tightness between the two adjacent heat exchange plates, thereby improving the connection strength;

[0034] Secondly, through the cooperation between the bite groove and the bite plate, the contact area between the two adjacent heat exchange plates in the stacking direction is effectively increased. Therefore, during the diffusion welding process, the contact area between the two adjacent heat exchange plates is larger, thereby improving the welding strength between the adjacent heat exchange plates under the premise of limited size and structure of the heat exchange plates;

[0035] The improvement in welding strength ensures that the interval between any two adjacent heat exchange channels on the same heat exchange plate can be further reduced, thereby improving the compactness of the entire heat exchange plate.

[0036] Due to the improved compactness of the heat exchange channels on the heat exchange plate, the number of heat exchange channels is increased, so the contact area of ​​the heat exchange medium is effectively increased, which is conducive to further improving the heat exchange efficiency of the entire heat exchanger.

[0037] Finally, compared with the existing technology, the present application can achieve the above purpose through the bite plate. The structure of the entire equipment is simple. At the same time, after the diffusion welding is completed, the bite plate will form an integral structure with the two adjacent heat exchange plates, effectively ensuring the stability and reliability of the entire heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic structural diagram of a diffusion bonding heat exchanger provided in Embodiment 1 of the present application;

[0039] FIG2 is a side view of a diffusion bonding heat exchanger provided in Embodiment 1 of the present application;

[0040] FIG3 is a schematic structural diagram of another optional embodiment of the diffusion bonding heat exchanger provided by the present application;

[0041] FIG4 is a schematic structural diagram of another optional embodiment of the diffusion bonding heat exchanger provided by the present application;

[0042] Figure 5 is a schematic diagram of the assembly of the diffusion welding heat exchanger and the welding tooling;

[0043] FIG6 is a flow chart of a method for designing a diffusion bonding heat exchanger provided in Embodiment 2 of the present application;

[0044] FIG7 is a diagram showing the areas of the U-shaped bite plate design in the design method;

[0045] Figure 8 is a schematic diagram showing the principle of calculating the extended welding area;

[0046] FIG9 is a diagram showing the areas of the Z-shaped bite plate design in the design method;

[0047] Figure markings: 1-heat exchange plate, 2-heat exchange channel, 3-bite groove, 4-bite plate, 5-temperature measuring hole, 6-temperature sensor, 7-pressing plate, 8-pressing screw, 9-pressing hole, 10-pressing nut, 201-first heat exchange channel, 202-second heat exchange channel, 301-bite cavity.

[0048] The purpose, features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0053] Implementation Method 1

[0054] 1 to 2 , this embodiment, as an optional embodiment of the present application, discloses a diffusion bonding heat exchanger, comprising a plurality of heat exchange plates 1 , wherein the heat exchange plates 1 are stacked on each other in the height direction;

[0055] A heat exchange channel 2 is provided on the bite plate 4, wherein the heat exchange channel 2 includes a plurality of first heat exchange channels 201 and / or a plurality of second heat exchange channels 202. The flow area of ​​the first heat exchange channels 201 may be larger than or smaller than the flow area of ​​the second heat exchange channels 202. The ratio of the flow area of ​​the first heat exchange channels 201 to the flow area of ​​the second heat exchange channels 202 is determined according to actual conditions.

[0056] If there are two types of heat exchange channels 2, the two different heat exchange channels 2 can be set on two heat exchange plates 1, or can be set on the upper and lower sides of the same heat exchange plate 1. During the stacking process, the different heat exchange channels 2 are stacked alternately.

[0057] If there is only one type of heat exchange channel 2, a complete heat exchange channel 2 can be provided on one heat exchange plate 1, or the heat exchange channel 2 can be divided into two halves and placed on two adjacent heat exchange plates 1, which are then joined together during the stacking process to form a complete heat exchange channel 2; this is specifically shown in Figures 3-5;

[0058] It should be noted that there are many different configurations of the heat exchange channel 2, and all of them fall within the scope of protection of this application.

[0059] The diffusion bonding heat exchanger further includes a bite groove 3, which includes two bite cavities 301. After the heat exchange plates 1 are stacked, the bite cavities 301 on two adjacent heat exchange plates 1 are spliced ​​and connected to each other.

[0060] In order to achieve symmetrical fixation of the heat exchange plate 1, a bite cavity 301 is provided on both sides of the heat exchange plate 1, and the area between the two bite cavities 301 is the layout area of ​​the heat exchange channel 2;

[0061] As shown in FIG1 , the engaging cavities 301 on both sides of the heat exchange plate 1 can be provided on either the top or bottom surface of the heat exchange plate 1. In this case, after the heat exchange plates 1 are stacked, the two engaging grooves 3 joined together will be located in the same plane.

[0062] As shown in FIG3 , the engaging cavities 301 on both sides of the heat exchange plate 1 can also be provided on the top and bottom surfaces of the heat exchange plate 1, respectively. In this case, after the heat exchange plates 1 are stacked, the two engaging grooves 3 connected to each other will be located on the upper and lower sides of the heat exchange plate 1, respectively. The engaging grooves 3 will be distributed along an S-shaped trajectory throughout the heat exchanger.

[0063] The diffusion bonding heat exchanger further includes a bite plate 4, which is inserted into the bite groove 3. The pressing plate and the bite groove 3 are interference fit, thereby ensuring that after the bite plate 4 is inserted into the bite groove 3, along the stacking direction of each heat exchange plate 1, the inner wall of the bite groove 3 and the outer wall of the bite plate 4 are in contact with each other, thereby ensuring that in the stacking direction, the bite plate 4 is tightly connected to the two heat exchange plates 1;

[0064] As needed, the cross section of the bite groove 3 is a U-shaped, S-shaped or Z-shaped structure. It should be pointed out that the cross section of the bite groove 3 can also be any other structure that can increase the contact area between the bite plate 4 and the bite groove 3.

[0065] It should also be noted that, as shown in Figures 3 and 4 , the angle between the bite plates 4 of adjacent layers can be 0°, that is, all the bite plates 4 are arranged in one direction, or the angle can be 90°, that is, they are arranged crosswise;

[0066] A temperature measuring hole 5 is also provided on the bite plate 4. The temperature measuring hole 5 is arranged along the length direction of the bite plate 4. A thermocouple or other temperature sensor 6 is inserted into the temperature measuring hole 5. The temperature sensor 6 can detect the temperature between the two heat exchange plates 1 in real time, thereby improving the control over the temperature during the diffusion welding process, which is beneficial to improving the welding quality.

[0067] The present application also discloses a welding tool for the above-mentioned diffusion welding heat exchanger, comprising two pressing plates 7 and a plurality of pressing screws 8. The two pressing plates 7 are provided with a plurality of pressing holes 9. As shown in FIG5 , when in use, the two pressing plates 7 are respectively placed on the front and rear sides of the bite plate 4. Each of the pressing screws 8 passes through the pressing holes 9 to connect the pressing plates 7 on both sides in series. At the same time, a pressing nut 10 is threadedly connected to each end of the pressing screw 8. The clamping force between the pressing plates 7 is adjusted by the pressing nut 10.

[0068] The above-mentioned welding tooling can not only quickly realize the alignment of each heat exchange plate 1 and improve the stacking efficiency of the heat exchange plate 1; it can also assist in realizing the one-time plug-in of all the bite plates 4, thereby improving the assembly efficiency of the entire heat exchanger as much as possible; at the same time, the clamping force of the two clamping plates 7 can also make each heat exchange plate 1 fit more closely, which is conducive to improving the welding quality of diffusion welding.

[0069] Compared with the prior art, the present application provides a bite groove and a bite plate between the two heat exchange plates. On the one hand, this can effectively improve the connection tightness between the two adjacent heat exchange plates, thereby improving the connection strength. On the other hand, through the cooperation between the bite groove and the bite plate, the contact area between the two adjacent heat exchange plates in the stacking direction is effectively increased. Therefore, during the diffusion welding process, the contact area between the two adjacent heat exchange plates is larger, thereby improving the welding strength between the adjacent heat exchange plates under the premise of limited size and structure of the heat exchange plates.

[0070] The improvement in welding strength enables those skilled in the art to further reduce the interval between any two adjacent heat exchange channels on the same heat exchange plate, thereby improving the compactness of the entire heat exchange plate.

[0071] At the same time, due to the improved compactness of the heat exchange channels on the heat exchange plate, the number of heat exchange channels is increased, so the contact area of ​​the heat exchange medium is effectively increased, which is conducive to further improving the heat exchange efficiency of the entire heat exchanger.

[0072] Finally, compared with the existing technology, the present application can achieve the above purpose through the bite plate. The structure of the entire equipment is simple. At the same time, after the diffusion welding is completed, the bite plate will form an integral structure with the two adjacent heat exchange plates, effectively ensuring the stability and reliability of the entire heat exchanger.

[0073] Implementation Method 2

[0074] 6 to 9 , this embodiment, as another optional embodiment of the present application, discloses a method for designing a diffusion bonding heat exchanger, comprising the following steps:

[0075] S1. Determine the size parameters of each heat exchange channel, and calculate the inherent welding area between two adjacent heat exchange plates based on the size parameters;

[0076] First, determine the size parameters of the heat exchange channel according to the heat exchange fluid of the heat exchanger, including the type and quantity of the heat exchange channel, the cross-sectional shape and the cross-sectional width a of the heat exchange channel. If the cross-section of the heat exchange channel is semicircular or circular, the cross-sectional width is the diameter; if the cross-section is square, the cross-sectional width is the cross-sectional width;

[0077] Then, two areas for setting the bite cavity are reserved on both sides of the heat exchange plate, and the heat exchange flow channel is arranged between the two areas;

[0078] Determine the distance between two adjacent heat exchange channels based on the welding tightness and the heat exchange fluid pressure, and then determine the number m of heat exchange channels that can be arranged on the heat exchange plate;

[0079] Then, the shape of the heat exchange channel along the flow direction of the heat exchange fluid is designed as needed, such as S-shaped, straight or other arbitrary shapes, and the length L of the heat exchange channel is calculated;

[0080] After obtaining the above parameters, the inherent welding area can be calculated according to the formula S0 = A-amL, where A represents the surface area of ​​the heat exchange plate;

[0081] S2. Determine a total welding area ratio, and calculate a total welding area according to the total welding area ratio;

[0082] The total welding area ratio of diffusion welding has a certain safety threshold n0; the total welding area ratio n should satisfy n>n0;

[0083] Determine the total welding area ratio based on the actual conditions such as the pressure on the heat exchanger, and then calculate the total welding area according to the calculation formula S=n*A;

[0084] S3. Calculating an extended welding area according to the total welding area and the inherent welding area;

[0085] Obtain the inherent welding area S0 calculated in step S1 and the total welding area obtained in step S2, and calculate the extended welding area according to the formula ΔS=S-S0;

[0086] S4. Obtaining a set of shape, structure, and dimension parameters of the bite plate according to the expanded welding area;

[0087] S41, determining the outer shape and structure of the occlusal plate;

[0088] It should be noted that this step will provide detailed analysis and explanation of the U-shaped and Z-shaped bite plates;

[0089] S42, determining a first constraint condition according to the expanded welding area and the external structure;

[0090] If the selected bite plate is in U shape, it can be seen from Figure 7 that it should be pointed out that diffusion welding only needs to consider the increased contact area in the vertical direction. As shown in Figure 8, after a bite plate is set, the a, b, c and d areas shown in the figure are all newly added contact areas. The area of ​​the newly added contact area of ​​the two adjacent heat exchange plates due to the insertion of the bite plate is 2*(S3+S2), where S2 represents the inner side area of ​​the overhanging end of the bite plate, and S3 represents the outer surface area of ​​the overhanging end of the bite plate as shown in Figure 7; however, after the bite cavity is set, the bite cavity will form a notch on the surface of the heat exchange plate. The area of ​​the above-mentioned notch needs to be deducted. The area of ​​the notch area is S1, so After placing a bite plate, the area of ​​the newly added contact area in the vertical direction is 2*(S3+S2)-S1, that is, as shown in Figure 8, since the overhanging end on the upper side of the bite plate is inserted into the upper heat exchange plate, and the overhanging end on the lower side of the bite plate is inserted into the lower heat exchange plate, the inner side and outer surface of the two overhanging ends will be in contact with the inner wall of the bite cavity in the stacking direction. However, in the technical solution without setting a bite plate, the joint notch of the upper and lower bite cavities is included in the welding area (that is, S1 in the figure). Therefore, compared with the technical solution without setting a bite plate, the above area needs to be deducted, and the area of ​​the newly added contact area is 2*(S3+S2)-S1;

[0091] At the same time, since two bite plates are set, the extended welding area between two adjacent heat exchange plates is: ΔS = 2*2*(S3+S2)-2*S1; at the same time, from the structure of the bite plate, the following relationship also exists: S3 = S2+S1;

[0092] Combined with n>n0, the expression of the first constraint can be obtained as follows:

[0093] According to step S3, we can get:

[0094] ΔS=SS 0＝ n*A-(A-amL)=n*A-A+amL

[0095] At the same time, since n>n0, ΔS>n0*A-A+amL;

[0096] Since ΔS=2*2*(S3+S2)-2*S1, S3=S2+S1;

[0097] Therefore 2*2*(S3+S2)-2*S1>n0*A-A+amL;

[0098] The expression of the first constraint condition can be obtained by sorting out: 8S2+2S1>(n0-1)A+amL;

[0099] If a occlusal plate with a Z-shaped cross section is selected, its expanded welding area satisfies the same calculation relationship;

[0100] S43, determining a second constraint condition according to the shape structure and strength requirements of the bite plate;

[0101] Since the bite plate includes a vertically arranged connecting member, the structural strength of the above-mentioned area is relatively weak. Therefore, in order to meet the strength requirements of the overall structure of the bite plate, combined with the material of the bite plate, the second constraint condition is determined to be: S1 ≥ S2 / 3;

[0102] The selection of a Z-shaped bite plate also needs to meet the above constraints;

[0103] S44, determining a third constraint condition according to the size parameters of the heat exchange plate and the heat exchange channel;

[0104] According to step S1, areas for accommodating bite cavities are provided on both sides of the heat exchange plate. The width of the bite cavity cannot be greater than the width of the area. Since the length of the area is the same as the length of the bite cavity, the expression of the third constraint condition is: S4 ≥ S2 + S1;

[0105] If a Z-shaped occlusal splint is selected, based on the same principle, the expression of the third constraint condition is: S4≥2S2+S1;

[0106] S45. Determine the size parameter set according to the first constraint condition, the second constraint condition, and the third constraint condition.

[0107] Combining the first constraint, the second constraint, and the third constraint, all (s1, s2) that satisfy the above constraints are size parameters that meet the requirements, and the above parameters are aggregated to obtain a size parameter set;

[0108] S5. Select one from the size parameter set as the size parameter of the bite plate.

[0109] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A diffusion bonding heat exchanger, wherein: It comprises a plurality of heat exchange plates (1), each of the heat exchange plates (1) being provided with a heat exchange channel (2), and the heat exchange plates (1) being stacked on each other; A bite groove (3), the bite groove (3) comprising two mutually connected bite cavities (301), the two bite cavities (301) being respectively arranged on two adjacent heat exchange plates (1); A bite plate (4), wherein the bite plate (4) is inserted into the bite groove (3), and along the stacking direction of each of the heat exchange plates (1), the inner wall of the bite groove (3) and the outer wall of the bite plate (4) are in contact with each other.

2. A diffusion bonding heat exchanger according to claim 1, wherein: The two engaging cavities (301) are simultaneously arranged on the top surface or the bottom surface of the heat exchange plate (1).

3. A diffusion bonding heat exchanger according to claim 1, wherein: The two engaging cavities (301) are respectively arranged on the top surface and the bottom surface of the heat exchange plate (1).

4. A diffusion bonding heat exchanger according to claim 2, wherein: The engagement groove (3) is in a U-shaped, S-shaped or Z-shaped structure.

5. The diffusion bonding heat exchanger according to claim 1, wherein: The heat exchange flow channel (2) comprises a plurality of first heat exchange flow channels (201) and / or a plurality of second heat exchange flow channels (202), and the flow areas of the first heat exchange flow channels (201) and the second heat exchange flow channels (202) are different.

6. The diffusion bonding heat exchanger according to claim 1, wherein: A temperature measuring hole (5) is also provided on the bite plate (4) along the length direction of the bite plate (4), and a temperature sensor (6) is provided in the temperature measuring hole (5).

7. A method for designing a diffusion bonding heat exchanger according to any one of claims 1 to 6, wherein: The following steps are involved: Determining the size parameters of each of the heat exchange channels, and calculating the inherent welding area between two adjacent heat exchange plates according to the size parameters; determining a total welding area ratio, and calculating a total welding area according to the total welding area ratio; Calculating an extended welding area according to the total welding area and the inherent welding area; Acquire a set of shape structure and size parameters of the bite plate according to the extended welding area; One of the size parameter sets is selected as the size parameter of the bite plate.

8. The design method according to claim 7, wherein: The inherent welding area satisfies the following calculation formula: S0=A-amL; wherein A represents the surface area of ​​the heat exchange plate; a represents the cross-sectional width of the heat exchange channel; L represents the length of the heat exchange channel, and m represents the number of the heat exchange channels.

9. The design method according to claim 7, wherein: The total welding area ratio satisfies the relationship n>n0, and the calculation formula of the total welding area is S=n*A; Wherein n represents the total welding area ratio, A represents the surface area of ​​the heat exchange plate, S0 represents the inherent welding area, and n0 represents the safety threshold of the total welding area ratio; the calculation formula of the extended welding area is: ΔS=S-S0.

10. The design method according to claim 7, wherein: The step of obtaining the shape structure and size parameter set of the bite plate according to the extended welding area comprises the following steps: Determining the outer shape structure of the bite plate; Determining a first constraint condition according to the extended welding area and the outer shape structure; Determining a second constraint condition according to the shape structure and strength requirements of the bite plate; Determining a third constraint condition according to the size parameters of the heat exchange plate and the heat exchange channel; The size parameter set is determined according to the first constraint condition, the second constraint condition and the third constraint condition.

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