Microchannel heat exchanger plate structure and microchannel heat exchanger
By setting the design that the intermediate channel width is greater than the edge channel width in the microchannel heat exchanger plate structure, the gap and leakage problems at the channels after welding are solved, and a firmer connection and higher welding qualification rate are achieved.
Patent Information
- Application Number
- CN202420801205.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The existing microchannel heat exchanger plate structure is prone to gaps and leakage at the channels after welding, mainly due to channel extrusion and distortion caused by thermal expansion.
A microchannel heat exchanger plate structure is designed, wherein the width of the intermediate channel is greater than the width of the edge channel. By this structure, the extrusion deformation of the edge channel is reduced during welding, and the gap is made up by diffusion welding deformation.
It effectively reduces the gap at the channels after welding, improves the connection firmness of the microchannel heat exchanger and the diffusion welding pass rate, and avoids leakage problems.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a microchannel heat exchanger plate structure and a microchannel heat exchanger. Background Art
[0002] Microchannel heat exchanger mainly refers to a multi-channel microstructured small heat exchanger manufactured by micromachining and precision technology with surface science and micro-manufacturing technology as the core. It has the advantages of low heat transfer resistance, high heat transfer efficiency, and small size. It shows good heat transfer performance in the field of active heat dissipation of electronic devices with integrated high heat flux density. Microchannel heat exchangers are widely used in energy, power, military, electronics, aerospace, hydrogen energy and other fields, playing a key role in medium heat exchange.
[0003] Microchannel heat exchangers usually connect multiple plate structures to form a heat exchanger by diffusion welding. For the diffusion welding process of microchannel heat exchangers, the larger the channel width of the welded plate, the worse the force transmission performance during diffusion welding, and thus the probability of welding at the channel of the plate structure will be lower.
[0004] In the prior art, at the junction of the channel and the solid part on the plate structure of the microchannel heat exchanger, due to the influence of thermal expansion, the expansion of the solid part will be much greater than the expansion of the channel position, resulting in extrusion and distortion at the channel, so that there is a gap after the adjacent plate structures are welded, which can easily cause leakage at the junction. Utility Model Content
[0005] In view of this, the utility model provides a microchannel heat exchanger plate structure and a microchannel heat exchanger to solve the problem in the prior art that the junction between the channel and the solid part of the microchannel heat exchanger plate structure is large in thermal deformation, and leakage is easily caused at the junction after welding.
[0006] In the first aspect, the utility model provides a microchannel heat exchanger plate structure, including a main body, on which are provided a plurality of parallel channels, and partitions are provided between adjacent channels. The channels include side channels close to the solid parts on both sides of the main body and middle channels located between the side channels, and the width of the middle channels is greater than the width of the side channels.
[0007] Beneficial effect: The utility model sets the width of the middle channel to be larger than the width of the side channel. When two adjacent microchannel heat exchanger plate structures are welded, since the width of the side channel is relatively small, the warping deformation caused by the expansion and extrusion of the groove bottom of the side channel after the solid part is heated will also be correspondingly reduced. The gap caused by the extrusion can be effectively compensated by the diffusion welding deformation of the plate structure, so that the connection between the two adjacent microchannel heat exchanger plate structures is more firm, ensuring that the product will not leak during the diffusion welding process, and can greatly increase the diffusion welding qualification rate of the product.
[0008] In an optional embodiment, there are multiple side channels, and the widths of the multiple side channels gradually increase from the two ends of the main body to the middle position.
[0009] Beneficial effect: In the utility model, since the solid part expands larger than other partition parts at the same temperature, the extrusion deformation of the channel groove bottom of the solid part close to the two ends of the main body is large, while the extrusion deformation of the channel groove bottom in the middle position of the main body is relatively small. By gradually increasing the width of multiple side channels from the two ends of the main body to the middle position, the warping deformation of the channel groove bottom can be reduced, thereby reducing the gap caused by extrusion.
[0010] In an optional embodiment, the width of the side channel is not greater than four times the thickness of the groove bottom of the side channel.
[0011] In an optional embodiment, the side channel includes a first channel, a second channel and a third channel, the first channel is adjacent to the solid portion, the second channel is adjacent to a side of the first channel away from the solid portion, and the third channel is adjacent to a side of the second channel away from the first channel.
[0012] Beneficial effect: The utility model can reduce the warping deformation of the groove bottom of the channel by setting the side channel as three adjacent channels, and the width of the three channels gradually increases from the solid part to the middle position of the main body, thereby reducing the gap caused by extrusion.
[0013] In an optional embodiment, the first channel, the second channel, and the third channel follow at least one of the following relationships:
[0014] The width of the first channel is not greater than four times the thickness of the groove bottom of the first channel;
[0015] The width of the second channel is not greater than five times the thickness of the groove bottom of the second channel;
[0016] The width of the third channel is not greater than six times the thickness of the groove bottom of the third channel.
[0017] In an optional embodiment, the width of the middle channel is not greater than seven times the thickness of the groove bottom of the middle channel.
[0018] In an optional embodiment, the bottom of the channel is arc-shaped.
[0019] Beneficial effects: The utility model sets the bottom of the channel to an arc shape, which is beneficial to the release of stress during diffusion welding and can make the deformation process of the bottom of the channel more uniform and stable, thereby effectively avoiding the problems of stress concentration and cross-sectional shape deformation.
[0020] In a second aspect, the utility model further provides a microchannel heat exchanger, comprising the above-mentioned microchannel heat exchanger plate structure, wherein a plurality of microchannel heat exchanger plate structures are stacked.
[0021] Since the microchannel heat exchanger adopts the microchannel heat exchanger plate structure of the present invention, it has the same beneficial effects as the microchannel heat exchanger plate structure, which will not be described in detail here.
[0022] In an optional embodiment, the channels on adjacent microchannel heat exchanger plate structures are arranged in a staggered manner.
[0023] Beneficial effects: The utility model can realize multi-layer heat exchange by staggered arrangement of channels on adjacent microchannel heat exchanger plate structures, thereby improving heat exchange efficiency.
[0024] In an optional embodiment, the channels on adjacent microchannel heat exchanger plate structures are perpendicular to each other. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0026] Figure 1 A schematic diagram of a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0027] Figure 2 A cross-sectional view of a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0028] Figure 3 This is a schematic diagram of expansion and extrusion of a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0029] Figure 4 A schematic diagram of a gap generated by expansion and extrusion of a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0030] Figure 5Another schematic diagram of a gap generated by expansion and extrusion of a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0031] Figure 6 It is a schematic diagram of a channel structure in a microchannel heat exchanger plate structure according to an embodiment of the utility model;
[0032] Figure 7 This is a schematic diagram of another channel structure in a microchannel heat exchanger plate structure according to an embodiment of the utility model.
[0033] Description of reference numerals:
[0034] 1. main body; 101. solid part; 102. partition part; 103. groove bottom;
[0035] 2, channel; 21, side channel; 22, middle channel; 211, first channel; 212, second channel; 213, third channel;
[0036] 3. Gap. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0038] Diffusion welding is a solid-state joining process that can obtain an integral welded joint. It is a precise joining method that uses local plastic deformation between materials in contact at high temperatures to form atomic diffusion between the contact surfaces of the two workpieces, thereby achieving bonding. Diffusion welding is usually used in situations where it is difficult or impossible to form a joint, such as parts with complex internal structures. Microchannel heat exchangers are a common application of diffusion welding.
[0039] In diffusion welding, the bonding area is increased due to the micro-roughness deformation of the bonding surface. At the beginning of bonding, atomic diffusion is used, and then the grains grow on the bonding surface, and the bonding interface becomes indistinguishable. The room temperature tensile strength of a diffusion welded joint with good welding conditions is as strong as that of the base material.
[0040] In the related art, in order to avoid the problem of leakage of diffusion-welded microchannel heat exchangers after diffusion welding, the usual practice is to reduce the overall size of the channel structure of the plate. However, this greatly increases the flow resistance of the heat exchanger and cannot meet the heat exchange between media with high requirements for flow resistance. Moreover, after the overall size of the channel structure is reduced, the channel size becomes smaller, thereby causing the non-channel size to increase, which will also greatly reduce the heat exchange performance of the heat exchanger. In order to meet the heat exchange performance, it is usually necessary to increase the overall size of the heat exchanger. Such a setting greatly increases the cost of production and manufacturing.
[0041] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.
[0042] According to an embodiment of the present utility model, on the one hand, as Figures 1 to 7 As shown, a microchannel heat exchanger plate structure is provided, including a main body 1, on which a plurality of channels 2 arranged in parallel are provided, and partition portions 102 are provided between adjacent channels 2, and the channels 2 include side channels 21 close to the solid portions 101 on both sides of the main body 1 and middle channels 22 located between the side channels 21, and the width of the middle channel 22 is greater than that of the side channel 21.
[0043] Specifically, Figure 1 and Figure 2 As shown, in this embodiment, there is no specific limitation on the shape of the main body 1. To conform to the actual situation, in this embodiment, the main body 1 adopts a rectangular plate structure, and multiple channels 2 are arranged in parallel on the main body 1. Both sides of the main body 1 are solid parts 101, and multiple channels 2 are located between two solid parts 101. There is a partition part 102 between adjacent channels 2, and the bottom of the channel 2 of the main body 1 is a groove bottom 103.
[0044] In this embodiment, the material of the main body 1 is not specifically limited. The main body 1 can be made of metal materials such as 316, 316L, 304 stainless steel and TA10, TA1 titanium alloy, etc. The main body 1 can use chemical etching technology to etch the heat exchange unit channel 2 of the micron to millimeter level on the metal plate, thereby manufacturing a microchannel heat exchanger plate.
[0045] In this embodiment, Figure 2 As shown, the side channel 21 is arranged near the solid portion 101 , the middle channel 22 is arranged between the side channels 21 on both sides, and the width of the middle channel 22 is set to be greater than the width of the side channel 21 .
[0046] In this embodiment, Figure 2 As shown, the groove bottom 103 at the bottom of each channel 2 has the same thickness.
[0047] In this embodiment, the shape of the channel 2 is not specifically limited. To conform to the actual situation, the cross-section of the channel 2 in this embodiment is rectangular.
[0048] Microchannel heat exchangers are usually made of stacked layers of microchannel heat exchanger plates. Diffusion welding equipment is used to continuously apply a certain amount of pressure to the heat exchange plates in the vertical direction, and to continuously heat them, so that the atoms on the contact surfaces between the heat exchange plates of the microchannel heat exchanger diffuse with each other and are welded into a whole.
[0049] During the diffusion welding process, since the product needs to be continuously heated, the microchannel heat exchanger plate will produce thermal expansion due to the increase in temperature. Since the expansion size of the solid part 101 is larger than that of the partition part 102 at the same temperature, and the thickness of the groove bottom 103 at the corresponding position of the channel 2 is thinner, the thermal expansion deformation of the solid part 101 will cause extrusion deformation of the channel 2 and the groove bottom 103 under the channel 2. However, when the width of the channel 2 is too large, the extrusion deformation gap 3 generated by the groove bottom 103 will be larger than the diffusion welding deformation of the heat exchanger plate, making it difficult to make up for the gap 3 by diffusion welding.
[0050] The utility model sets the width of the middle channel 22 to be larger than the width of the side channel 21. When two adjacent microchannel heat exchanger plate structures are welded, since the width of the side channel 21 is smaller than the width of the middle channel 22, after the solid portion 101 is deformed by heat, the warping deformation caused by the groove bottom 103 of the side channel 21 being squeezed will also be correspondingly reduced. The gap 3 produced by the extrusion can be effectively compensated by the diffusion welding deformation of the plate structure, so that the connection between the two adjacent microchannel heat exchanger plate structures is more firmly established, ensuring that the product will not leak during the diffusion welding process, and greatly increasing the diffusion welding qualification rate of the product.
[0051] In one embodiment, Figure 2 As shown, there are multiple side channels 21, and the widths of the multiple side channels 21 gradually increase from the two ends of the main body 1 to the middle position.
[0052] Specifically, Figure 3 and Figure 4 As shown, during the diffusion welding process, after the solid part 101 is deformed by heat, it will squeeze the groove bottom 103 of the channel 2 near the solid part 101, causing the groove bottom 103 to warp and deform. Affected by heat conduction, the channel 2 close to the solid part 101 has a large extrusion deformation. When the channel 2 gradually moves away from the solid part, the extrusion deformation of the channel 2 gradually decreases, and the gap 3 generated by the extrusion of the groove bottom 103 also decreases accordingly.
[0053] In the present invention, since the solid part 101 expands larger than the partition part 102 at the same temperature, the extrusion deformation of the groove bottom 103 of the channel 2 of the solid part 101 close to the two ends of the main body 1 is large, while the extrusion deformation of the groove bottom 103 of the channel 2 in the middle position of the main body 1 is relatively small. By gradually increasing the width of the plurality of side channels 21 from the two ends of the main body 1 to the middle position, the warping deformation of the groove bottom 103 of the channel 2 can be reduced, thereby reducing the gap 3 caused by extrusion.
[0054] In one embodiment, the width of the side channel 21 is no greater than four times the thickness of the groove bottom 103 of the side channel 21 .
[0055] Specifically, in this embodiment, the width of the side channel 21 near the solid part 101 is set to be less than 4 times the thickness of the groove bottom 103. For example, when the groove bottom 103 of the side channel 21 is 0.2 mm thick, the width of the side channel 21 is less than 0.8 mm.
[0056] The utility model sets the width of the middle channel 22 to be slightly larger than the width of the side channel 21, which can ensure that the product will not leak during the diffusion welding process and can greatly increase the diffusion welding qualification rate of the product.
[0057] In one embodiment, Figure 2 As shown, the side channel 21 includes a first channel 211, a second channel 212 and a third channel 213. The first channel 211 is adjacent to the solid portion 101, the second channel 212 is adjacent to a side of the first channel 211 away from the solid portion 101, and the third channel 213 is adjacent to a side of the second channel 212 away from the first channel 211.
[0058] Specifically, in this embodiment, the channel 2 is set to be a plurality of channels 2 of unequal widths, wherein the width of the first channel 211 is the smallest, the width of the second channel 212 is greater than the width of the first channel 211, the width of the third channel 213 is greater than the width of the second channel 212, and the width of the middle channel 22 is greater than the width of the third channel 213.
[0059] The utility model sets the side channel 21 as three adjacent channels 2, and the width of the three channels 2 gradually increases from the solid part 101 to the middle position of the main body 1, which can reduce the warping deformation of the groove bottom 103 of the channel 2, thereby reducing the gap 3 caused by extrusion.
[0060] In one embodiment, the first channel 211, the second channel 212, and the third channel 213 follow at least one of the following relationships:
[0061] The width of the first channel 211 is not greater than four times the thickness of the groove bottom 103 of the first channel 211;
[0062] The width of the second channel 212 is not greater than five times the thickness of the groove bottom 103 of the second channel 212;
[0063] The width of the third channel 213 is not greater than six times the thickness of the groove bottom 103 of the third channel 213 .
[0064] Specifically, in this embodiment, due to the vertical pressure applied to the plate during diffusion welding, the plate will be slightly deformed during the entire diffusion welding process, and the deformation is usually 0.01mm to 0.03mm. When the width of the first channel 211 is designed to be small, it is designed to be no greater than four times the thickness of its groove bottom 103. In this way, the warping deformation caused by the solid part 101 squeezing the groove bottom 103 of the first channel 211 will be correspondingly smaller, and the gap 3 generated by the squeezing can be effectively compensated by the diffusion welding deformation of the heat exchange plate.
[0065] In this embodiment, Figure 5 As shown, since the second channel 212 is far from the solid part 101, the influence of the thermal expansion deformation generated by the solid part 101 on the second channel 212 will be smaller than that on the first channel 211. Therefore, the width of the second channel 212 can be appropriately increased, and can be designed to be no greater than five times the thickness of its groove bottom 103. During diffusion welding, the gap 3 generated by the thermal expansion of the groove bottom 103 of the second channel 212 and the lower plate can be effectively compensated by the diffusion welding deformation of the heat exchange plate.
[0066] Since the third channel 213 is farthest from the solid part 101, the influence of the thermal expansion deformation generated by the solid part 101 on the third channel 213 is smaller than that on the second channel 212. Therefore, the width of the third channel 213 can be further appropriately increased, and can be designed to be no greater than six times the thickness of its groove bottom 103. During diffusion welding, the gap 3 generated by the thermal expansion of the groove bottom 103 of the third channel 213 and the lower plate can be effectively compensated by the diffusion welding deformation of the heat exchange plate.
[0067] In this embodiment, in order to ensure that the product does not leak during the diffusion welding process and increase the diffusion welding qualification rate of the product, the width of the first channel 211 is set to be less than four times the thickness of its groove bottom 103, the width of the second channel 212 is set to be less than five times the thickness of its groove bottom 103, and the width of the third channel 213 is set to be less than six times the thickness of its groove bottom 103, and the remaining intermediate channels 22 can be channels 2 with widths that meet the requirements of heat exchange and resistance design. For example, when the groove bottom 103 thickness of the first channel 211 is 0.2mm, the width of the first channel 211 is less than 0.8mm, when the groove bottom 103 thickness of the second channel 212 is 0.2mm, the width of the second channel 212 is less than 1mm, and when the groove bottom 103 thickness of the third channel 213 is 0.2mm, the width of the third channel 213 is less than 1.2mm.
[0068] In some other embodiments, only the width of the first channel 211 may be set to be less than four times the thickness of the groove bottom 103, and the width of the second channel 212 and the width of the third channel 213 may be set to multiples of the thickness of the groove bottom 103 using other ratios; or only the width of the second channel 212 may be set to be less than five times the thickness of the groove bottom 103, and the width of the first channel 211 and the width of the third channel 213 may be set to multiples of the thickness of the groove bottom 103 using other ratios; or only the width of the third channel 213 may be set to be less than six times the thickness of the groove bottom 103, and the width of the first channel 211 and the width of the second channel 212 may be set to multiples of the thickness of the groove bottom 103 using other ratios; or the width of the first channel 211 may be set to be less than four times the thickness of the groove bottom 103, and the width of the second channel 212 may be set to be less than six times the thickness of the groove bottom 103, and the width of the first channel 211 and the width of the second channel 212 may be set to multiples of the thickness of the groove bottom 103 using other ratios; The width of the second channel 212 is set to be less than five times the thickness of the groove bottom 103, and the width of the third channel 213 is set to be a multiple of the thickness of the groove bottom 103 using other ratios; or the width of the second channel 212 is set to be less than five times the thickness of the groove bottom 103, the width of the third channel 213 is set to be less than six times the thickness of the groove bottom 103, and the width of the first channel 211 is set to be a multiple of the thickness of the groove bottom 103 using other ratios; or the width of the first channel 211 is set to be less than four times the thickness of the groove bottom 103, the width of the third channel 213 is set to be less than six times the thickness of the groove bottom 103, and the width of the second channel 212 is set to be a multiple of the thickness of the groove bottom 103 using other ratios. In the above embodiments, the width of each channel 2 gradually increases from the two ends of the main body 1 to the middle position.
[0069] In one embodiment, the width of the middle channel 22 is no greater than seven times the thickness of the groove bottom 103 of the middle channel 22 .
[0070] Specifically, practice has shown that the channels 2 affected by the thermal expansion deformation of the solid portion 101 will not exceed three channels 2. When it comes to the fourth channel 2 far away from the solid portion 101, the channel 2 width can be designed to be wider. In this embodiment, the width of the middle channel 22 is set to be less than seven times the thickness of its groove bottom 103.
[0071] In this embodiment, the width of the middle channel 22 is no greater than 3.5 mm.
[0072] In one embodiment, Figure 6 and Figure 7 As shown, the bottom of channel 2 is arc-shaped.
[0073] Specifically, in this embodiment, the bottom of the channel 2 can be set to a smoothly transitioned arc-shaped chamfered structure, or the bottom of the channel 2 can be set to a semicircular structure.
[0074] The utility model sets the bottom of the channel 2 to an arc shape, which is beneficial to the release of stress during diffusion welding, and can make the deformation process of the bottom of the channel 2 more uniform and stable, thereby effectively avoiding the problems of stress concentration and cross-sectional shape deformation.
[0075] According to an embodiment of the present utility model, on the other hand, a microchannel heat exchanger is provided, comprising the above-mentioned microchannel heat exchanger plate structure, wherein a plurality of microchannel heat exchanger plate structures are stacked.
[0076] The microchannel heat exchanger provided by the utility model adopts heat exchanger plates with channels 2 of unequal widths. The width of the channel 2 in the area close to the entity part 101 in the plate structure is small, and the width of the channel 2 in the area far from the entity part 101 is large, which can effectively avoid the problem of large deformation of the groove bottom 103 of the channel 2 close to the entity part 101 due to the extrusion deformation caused by the high-temperature thermal expansion of the entity part 101, resulting in leakage.
[0077] The microchannel heat exchanger plate structure provided by the utility model adopts a structure of unequal width channels 2. Since there are only three channels 2 affected by the size, the heat exchange performance and flow resistance performance of the overall heat exchanger will not be affected. Compared with the traditional heat exchanger with equal width channels 2, the microchannel heat exchanger in the utility model with the same outer volume has better heat exchange performance because the width of its internal channel 2 can be set larger, and the flow resistance of the heat exchange medium in the channel 2 is smaller, which can meet the needs of more working conditions and greatly reduce the production cost of the factory.
[0078] In one embodiment, the channels 2 on adjacent microchannel heat exchanger plate structures are arranged in a staggered manner.
[0079] The utility model arranges the channels 2 on the adjacent microchannel heat exchanger plate structures in a staggered manner to realize multi-layer heat exchange and improve the heat exchange efficiency.
[0080] In one embodiment, the channels 2 on adjacent microchannel heat exchanger plate structures are perpendicular to each other, which can better disperse the heat generated on the microchannel heat exchanger plate structures and improve the heat dissipation efficiency.
[0081] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A microchannel heat exchanger plate structure, characterized in that: include: A main body (1), wherein a plurality of channels (2) arranged in parallel are provided on the main body (1), a partition portion (102) is provided between adjacent channels (2), and the channels (2) include side channels (21) close to the solid portions (101) on both sides of the main body (1) and a middle channel (22) located between the side channels (21), wherein the width of the middle channel (22) is greater than the width of the side channels (21).
2. The microchannel heat exchanger plate structure according to claim 1, characterized in that: There are a plurality of side channels (21), and the widths of the plurality of side channels (21) gradually increase from the two ends of the main body (1) toward the middle.
3. The microchannel heat exchanger plate structure according to claim 2, characterized in that: The width of the side channel (21) is not greater than four times the thickness of the groove bottom (103) of the side channel (21).
4. The microchannel heat exchanger plate structure according to claim 2, characterized in that: The side channel (21) comprises: A first channel (211), the first channel (211) being adjacent to the solid portion (101); a second channel (212), the second channel (212) being adjacent to a side of the first channel (211) away from the solid portion (101); A third channel (213), wherein the third channel (213) is adjacent to a side of the second channel (212) away from the first channel (211).
5. The microchannel heat exchanger plate structure according to claim 4, characterized in that: The first channel (211), the second channel (212), and the third channel (213) comply with at least one of the following relationships: The width of the first channel (211) is no greater than four times the thickness of the groove bottom (103) of the first channel (211); The width of the second channel (212) is no greater than five times the thickness of the groove bottom (103) of the second channel (212); The width of the third channel (213) is no greater than six times the thickness of the groove bottom (103) of the third channel (213).
6. The microchannel heat exchanger plate structure according to any one of claims 1 to 5, characterized in that: The width of the middle channel (22) is no greater than seven times the thickness of the groove bottom (103) of the middle channel (22).
7. The microchannel heat exchanger plate structure according to any one of claims 1 to 5, characterized in that: The bottom of the channel (2) is arc-shaped.
8. A microchannel heat exchanger, characterized in that: include: The microchannel heat exchanger plate structure according to any one of claims 1 to 7, wherein a plurality of the microchannel heat exchanger plate structures are stacked.
9. The microchannel heat exchanger according to claim 8, characterized in that: The channels (2) on adjacent microchannel heat exchanger plate structures are arranged in a staggered manner.
10. The microchannel heat exchanger according to claim 9, characterized in that: The channels (2) on adjacent microchannel heat exchanger plate structures are perpendicular to each other.