A heat exchange micro-element, a heat exchange plate, and a plate heat exchanger

Abstract

This invention provides a heat exchange micro-element, a heat exchange plate, and a plate heat exchanger. The heat exchange micro-element includes a protrusion and multiple sub-recesses surrounding the protrusion. The protrusion and each sub-recess are connected by a curved surface, which is a multi-segment structure including a first curved surface segment and a second curved surface segment arranged sequentially. The curvature directions of the first and second curved surface segments are different. The curved surface structure is optimized, resulting in a compact structure and a smooth transition between the protrusion and each sub-recess. The heat exchange plate includes a main plate forming a main heat exchange zone, which is composed of multiple heat exchange micro-elements. Adjacent heat exchange micro-elements are spliced ​​together to form a recessed area. This ensures uniform thickness throughout the heat exchange plate, reduces the risk of cracking, simplifies the processing of the heat exchange plate, improves the processing quality of the heat exchange plate, and solves the problems of high processing difficulty, uneven thickness, high cracking risk, and low reliability of heat exchange plates.

Description

Technical Field

[0001] This invention belongs to the field of heat exchange technology, and particularly relates to a heat exchange micro-element, a heat exchange plate, and a plate heat exchanger. Background Technology

[0002] The heat exchange plate is the core component of a plate heat exchanger, and its structure significantly affects the overall performance. In existing technologies, the heat exchange zone of the heat exchange plate has multiple raised points and multiple recessed points. Adjacent raised points are transitioned by concave curved surfaces, and adjacent recessed points are transitioned by convex curved surfaces. Two adjacent heat exchange plates are stacked to achieve contact between the recessed points and the raised points. However, both the raised points and the recessed points are planar, and the curvature changes greatly at the transition between the planar and curved surfaces. The complex structure of the concave and convex curved surfaces leads to uneven thickness of the heat exchange plate and an increased risk of cracking, which in turn affects the performance of the heat exchange plate. Summary of the Invention

[0003] In view of this, the present invention provides a heat exchange micro-element, a heat exchange plate, and a plate heat exchanger to solve the problems in the prior art, such as uneven thickness, high risk of cracking, and low reliability caused by the complex transition surface structure of the heat exchange micro-element.

[0004] The present invention provides a heat exchange micro-element for a heat exchange plate; the heat exchange micro-element includes a protrusion and a plurality of sub-recesses surrounding the protrusion; the protrusion and each sub-recess are connected by a curved surface, the curved surface having a multi-segment structure and including a first curved surface segment and a second curved surface segment;

[0005] The first curved surface segment is connected to the protrusion, and the second curved surface segment is connected to the sub-recessed portion, and the curvature direction of the first curved surface segment is different from that of the second curved surface segment.

[0006] Optionally, the surface further includes a transition surface segment located between the first surface segment and the second surface segment.

[0007] Further optionally, both the protrusion and the recess are planar; the first curved surface segment is a convex surface, the first curved surface segment protrudes towards one side of the protrusion, and one end of the first curved surface segment is tangent to the protrusion, and the other end of the first curved surface segment is tangent to the transition surface segment;

[0008] The second curved surface segment is a concave surface, which is concave to one side of the sub-recessed portion, and one end of the second curved surface segment is tangent to the sub-recessed portion, while the other end of the second curved surface segment is tangent to the transition surface segment.

[0009] Further optionally, the point of tangency between the protrusion and the first curved surface segment is A, and the point of tangency between the sub-recessed portion and the second curved surface segment is B; satisfying: θ < 0.05°;

[0010] Wherein, θ is the angle between line a and line b, line a is a line passing through point A and tangent to both the protrusion and the first curved surface segment, and line b is a line passing through point B and tangent to both the sub-concave portion and the second curved surface segment.

[0011] Further optionally, the heat exchange micro-element is a three-dimensional polygonal surface, with a sub-recessed portion provided at each corner of the polygonal surface and a protrusion provided at the center point of the polygonal surface; the edges of the polygonal surface are all arc lines, and the protrusion direction of the arc lines is consistent with the protrusion direction of the protrusion.

[0012] Further optionally, two adjacent surfaces form a transition curve, the transition curve connecting the center point of the polygonal surface and the midpoint of the arc line, and the transition curve includes a first curve and a second curve connected to the first curve;

[0013] The first curve is close to the center point of the polygonal surface, and the second curve is close to the midpoint of the arc line; the radius of curvature of the first curve and the radius of curvature of the second curve are equal, and the length of the first curve and the length of the second curve are equal.

[0014] The present invention also provides a heat exchange plate, including a main plate, wherein the main plate forms a main heat exchange zone; the main heat exchange zone is composed of a plurality of heat exchange micro-elements as described in any one of the above claims, and the plurality of adjacent heat exchange micro-elements are spliced ​​together to form a plurality of sub-recesses.

[0015] Optionally, the main body plate further includes a first plane, a second plane, and a central plane; the first plane and the second plane are disposed opposite to each other, and the central plane is located between the first plane and the second plane; the protrusion of each heat exchange micro-element is located on the first plane and protrudes from the central plane toward the first plane; the sub-recess of each heat exchange micro-element is located on the second plane and concave from the central plane toward the second plane; the area of ​​the protrusion is larger than the area of ​​the recess.

[0016] The central plane is a plane passing through the center point of the main body plate.

[0017] Alternatively, the following condition can be met: 0.4 < s0 / s < 0.6;

[0018] Wherein, s0 is the distance between the midpoint of the arc line of the heat exchange micro-element and the first plane, and s is the distance between the protrusion and the recess.

[0019] Further optionally, among the multiple heat exchange micro-elements arranged sequentially around the same point, the lines connecting the projections of the center points of the multiple recesses onto the central plane form a regular polygon, and the projection of the center point of the protrusion onto the central plane is the center point of the regular polygon.

[0020] Further optionally, the heat exchange plate also includes a side plate, which is connected to the edge of the main plate; satisfying: cosα=h / (h+s);

[0021] Wherein, α is the angle between the side plate surface and the center plane, s is the distance between the protrusion and the recess, and h is the thickness of the main plate.

[0022] The present invention also provides a plate heat exchanger, including a front end plate, a rear end plate and any of the heat exchange plates described above, wherein multiple heat exchange plates are provided and the multiple heat exchange plates are stacked sequentially between the front end plate and the rear end plate; a cavity is formed between two adjacent heat exchange plates.

[0023] Compared with the prior art, the main advantages of the present invention are as follows:

[0024] A protrusion is designed to connect with multiple surrounding sub-recesses via a curved surface. The curved surface has a multi-segment structure, including a first curved surface segment and a second curved surface segment. The first curved surface segment connects to the protrusion, and the second curved surface segment connects to the sub-recesses. The curvature directions of the first and second curved surface segments are different. The surface structure is optimized to ensure a smooth transition between the protrusion and each sub-recess, guaranteeing uniform thickness throughout the heat exchange plate, reducing the risk of cracking, simplifying the heat exchange plate manufacturing process, improving the manufacturing quality of the heat exchange plate, and solving the problems of high manufacturing difficulty, uneven thickness, high cracking risk, and low reliability of heat exchange plates. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0026] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the heat exchange micro-element provided by the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of an embodiment of the heat exchange plate provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the overall structure of the heat exchange plate embodiment provided by the present invention;

[0030] Figure 4 This is a schematic diagram of an embodiment of the plate heat exchanger provided by the present invention;

[0031] In the picture:

[0032] 1-Heat exchange plate; 11-Main plate; 111-Main heat exchange zone; 112-Heat exchange micro-element; 113-Protrusion; 114-Sub-recessed part; 115-First curved surface segment; 116-Second curved surface segment; 117-Transition surface segment; 118-First curve; 119-Second curve; 1110-Arc line; 1111-Corner A hole; 1112-Corner B hole; 1113-Corner C hole; 1114-Corner D hole; 12-Side plate;

[0033] 2-Plate heat exchanger; 21-Front end plate; 211-First connector; 212-Second connector; 213-Third connector; 214-Fourth connector; 22-Rear end plate. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0036] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0037] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0038] In the prior art, the heat exchange zone of the heat exchange plate has multiple convex points and multiple concave points. Adjacent convex points are transitioned by concave curved surfaces, and adjacent concave points are transitioned by convex curved surfaces. Two adjacent heat exchange plates are stacked to achieve contact between the concave points and the convex points. However, both the convex points and the concave points are planar. The curvature changes greatly at the transition between the planar and curved surfaces. The complex structure of the concave and convex curved surfaces leads to uneven thickness of the heat exchange plate and an increased risk of cracking, which in turn affects the performance of the heat exchange plate.

[0039] This invention creatively provides a heat exchange micro-element for a heat exchange plate; the heat exchange micro-element includes a protrusion and multiple sub-recesses, the protrusion and each sub-recess are connected by a curved surface, the curved surface is a multi-segment structure and includes a first curved surface segment and a second curved surface segment arranged sequentially; the curvature direction of the first curved surface segment and the curvature direction of the second curved surface segment are different.

[0040] The optimized curved surface structure is compact, allowing for a smooth transition between the protrusions and the various sub-recesses. This ensures uniform thickness throughout the heat exchange plate, reduces the risk of cracking, simplifies the heat exchange plate manufacturing process, improves the manufacturing quality of the heat exchange plate, and solves the problems of high manufacturing difficulty, uneven thickness, high risk of cracking, and low reliability of heat exchange plates.

[0041] <Heat Exchange Micro-Element>

[0042] like Figure 1 As shown, this embodiment provides a heat exchange micro-element 112, including a protrusion 113 and a plurality of sub-recesses 114 surrounding the protrusion 113; the protrusion 113 and each sub-recess 114 are connected by a curved surface, the curved surface having a multi-segment structure and including a first curved surface segment 115, a second curved surface segment 116, and a transition surface segment 117; the first curved surface segment 115 is connected to the protrusion 113, the second curved surface segment 116 is connected to the sub-recesses 114, and the curvature direction of the first curved surface segment 115 is different from that of the second curved surface segment 116, the curvature direction of each part of the first curved surface segment 115 is consistent, and the curvature direction of each part of the second curved surface segment 116 is consistent, ensuring the quality of the curved surface; the transition surface segment 117 is located at the connection between the first curved surface segment 115 and the second curved surface segment 116, optimizing the structure of the curved surface and reducing the processing difficulty of the curved surface;

[0043] In this embodiment, a heat exchange micro-element 112 includes four sub-recesses 114; the four heat exchange micro-element 112 are arranged sequentially around the same point, the four sub-recesses 114 are spliced ​​together to form a recess, and the lines connecting the projections of the center points of the four protrusions 113 on the same plane form a regular quadrilateral.

[0044] To address the problem of uneven thickness and easy cracking of heat exchange plate 1 caused by the complex structure of curved surfaces, this embodiment proposes that both the protrusion 113 and the sub-recess are planar, and the sub-recess is evenly distributed around the protrusion 113; the first curved surface segment 115 is a convex curved surface, protruding towards one side of the protrusion 113; the second curved surface segment 116 is a concave curved surface, concave towards one side of the sub-recess 114.

[0045] The protrusion 113 is tangent to the first curved surface segment 115, and the recessed portion 114 is tangent to the second curved surface segment 116. The two ends of the transition surface segment 117 are tangent to the first curved surface segment 115 and the second curved surface segment 116, respectively. The first curved surface and the second curved surface transition smoothly, ensuring the continuity of the curved surface and avoiding large curvature changes at the connection between the first curved surface segment 115 and the transition surface segment 117 and the second curved surface segment 116 and the transition surface segment 117, which can significantly reduce the risk of cracking of the heat exchange plate 1.

[0046] Furthermore, the point of tangency between the protrusion 113 and the first curved surface segment 115 is A, and the point of tangency between the sub-recessed portion 114 and the second curved surface segment 116 is B; satisfying: θ < 0.05°;

[0047] Wherein, θ is the angle between line a and line b, line a is a line passing through point A and tangent to both the protrusion 113 and the first curved surface segment 115, and line b is a line passing through point B and tangent to both the sub-recessed portion 114 and the second curved surface segment 116.

[0048] To address the problem of poor heat exchange performance caused by unreasonable structural design of heat exchange plate 1, this embodiment proposes that the main plate 11 further includes a first plane, a second plane, and a central plane; the first plane and the second plane are arranged opposite to each other, and the central plane is located between the first plane and the second plane; the protrusions 113 of each heat exchange micro-element 112 are all located on the first plane and all protrude from the central plane toward the first plane; the sub-recesses 114 of each heat exchange micro-element 112 are all located on the second plane and all protrude from the central plane toward the second plane; the area of ​​the protrusions 113 is larger than the area of ​​the recesses; preferably, the area of ​​the protrusions 113 is four times the area of ​​the recesses;

[0049] The central plane is the plane passing through the center point of the main body plate 11.

[0050] To address the problem of low heat exchange efficiency of the heat exchange plate due to unreasonable structural design of the heat exchange micro-element 112, this embodiment proposes that the heat exchange micro-element 112 is a three-dimensional polygonal surface, with a sub-recess 114 at each corner of each polygonal surface and a protrusion 113 at the center point of the polygonal surface; the edges of the polygonal surface are all arc lines 1110, and the protrusion direction of the arc lines 1110 is consistent with the protrusion direction of the protrusion 113; preferably, the polygonal surface is a square surface, and the four corners of the square surface are rounded.

[0051] To address the problem of low heat exchange efficiency caused by an unreasonable transition curve structure design between two adjacent curved surfaces, this embodiment proposes that two adjacent curved surfaces form a transition curve. The transition curve connects the center point of the polygonal surface and the midpoint of the arc line 1110, and the transition curve includes a first curve 118 and a second curve 119 connected to the first curve 118. The first curve 118 is close to the center point of the polygonal surface, and the second curve 119 is close to the midpoint of the arc line 1110. The radius of curvature of the first curve 118 and the radius of curvature of the second curve 119 are equal, and the length of the first curve 118 and the length of the second curve 119 are equal. This avoids large curvature changes at the connection between the first curve 118 and the second curve 119, significantly reducing the risk of cracking of the heat exchange plate 1.

[0052] Preferably, the heat exchange micro-element 112 is symmetrical in front, back, left, and right.

[0053] <Heat exchange plate>

[0054] like Figure 2 and Figure 3 As shown, this embodiment provides a heat exchange plate 1, including a main plate 11, the main plate 11 forming a main heat exchange region 111; the main heat exchange region 111 is composed of a plurality of heat exchange micro-elements 112 as described above, the main heat exchange region 111 is mirror-symmetrical about the length direction of the heat exchange plate 1; adjacent heat exchange micro-elements 112 are spliced ​​together to form a plurality of sub-recesses 114 forming a recess; specifically, the plurality of heat exchange micro-elements 112 are arranged in a regular array to form the main heat exchange region 111, and adjacent heat exchange micro-elements 112 are spliced ​​together to form a plurality of sub-recesses 114 forming a recess; the protrusions 113 form a high welding point plane, and the recesses form a low welding point plane. When two adjacent heat exchange plates 1 are connected, the recesses of one heat exchange plate 1 are correspondingly arranged with the protrusions 113 of the other heat exchange plate 1, so that the two heat exchange plates 1 are in contact and the welding strength is improved.

[0055] The protrusions 113 are evenly distributed in the main heat exchange zone 111, and the recesses are evenly distributed in the main heat exchange zone 111, with the protrusions 113 and the recesses spaced apart.

[0056] To address the problem of poor heat exchange performance caused by unreasonable structural design of heat exchange plate 1, this embodiment proposes that the main plate 11 further includes a first plane, a second plane, and a central plane; the first plane and the second plane are arranged opposite to each other, and the central plane is located between the first plane and the second plane; the protrusion 113 of each heat exchange micro-element 112 is located on the first plane, and the protrusion of each heat exchange micro-element 112 protrudes from the central plane toward the first plane; the sub-recesses 114 of each heat exchange micro-element 112 are located on the second plane, and the sub-recesses 114 of each heat exchange micro-element 112 are concave from the central plane toward the second plane; the area of ​​the protrusion 113 is larger than the area of ​​the recess; preferably, the area of ​​the protrusion 113 is four times the area of ​​the recess.

[0057] The central plane is the plane passing through the center point of the main body plate 11.

[0058] Furthermore, the following condition must be met: 0.4 < s0 / s < 0.6;

[0059] Wherein, s0 is the distance between the midpoint of the arc 1110 and the first plane, and s is the distance between the protrusion 113 and the recess.

[0060] Preferably, among the multiple heat exchange micro-elements 112 arranged sequentially around the same point, the lines connecting the projections of the center points of the multiple recesses onto the central plane form a regular polygon, and the projection of the center point of the protrusion 113 onto the central plane is the center point of the regular polygon.

[0061] To address the problem of unreliable connections between multiple heat exchange plates due to unreasonable side plate structure design, this embodiment proposes that the heat exchange plate 1 also includes a side plate 12. When multiple heat exchange plates 1 are stacked, two adjacent side plates 12 are completely fitted together to ensure the welding strength of two adjacent heat exchange plates 1. The side plate 12 is connected to the edge of the main plate 11, satisfying: cosα=h / (h+s).

[0062] Where α is the angle between the surface of the side plate 12 and the central plane, s is the distance between the protrusion 113 and the recess, and h is the thickness of the main plate 11.

[0063] The main heat exchange zone 111 is the central area of ​​the heat exchange plate 1, and corner holes are formed around the main heat exchange zone 111. In this embodiment, the heat exchange plate 1 has a quadrilateral structure, and corner holes A1111, B1112, C1113, and D1114 are formed at the four corners of the quadrilateral structure. Corner holes A1111 and B1112 are arranged opposite to each other along the length of the heat exchange plate 1, corner holes C1113 and D1114 are arranged opposite to each other along the length of the heat exchange plate 1, corner holes A1111 and C1113 are arranged opposite to each other along the length and width of the heat exchange plate 1, and corner holes B1112 and D1114 are arranged opposite to each other along the length and width of the heat exchange plate 1. Corner hole A1111 is connected to the first liquid inlet connector, corner hole B1112 is connected to the first liquid outlet connector, corner hole C1113 is connected to the second liquid inlet connector, and corner hole D1114 is connected to the second liquid outlet connector.

[0064] When multiple heat exchange plates 1 are stacked, a cavity is formed between two adjacent heat exchange plates 1. Corner holes A1111, B1112, C1113 and D1114 are all in communication with the cavity. Fluid can enter the cavity through the first liquid inlet and exit through the first liquid outlet; or, fluid can enter the cavity through the second liquid inlet and exit through the second liquid outlet.

[0065] In this embodiment, the heat exchange plate 1, while ensuring a compact structure and heat exchange performance, uses a new curved surface design method to ensure the forming effect of the heat exchange plate 1, making the thickness uniform in all places, effectively solving the problems of difficult processing and easy cracking during stamping caused by the complex curved surface of the plate heat exchanger.

[0066] Plate heat exchanger

[0067] like Figure 4 As shown, this embodiment proposes a plate heat exchanger 2, including a front plate 21, a rear plate 22, and heat exchange plates 1 as described above. Multiple heat exchange plates 1 are provided, and these plates are stacked sequentially between the front plate 21 and the rear plate 22. A cavity is formed between two adjacent heat exchange plates 1, and when fluid flows through this cavity, heat exchange is achieved through the heat exchange plates 1. Specifically, the plate heat exchanger 2 is mainly formed by stacking multiple heat exchange plates 1 and brazing filler material and then welding them at high temperature.

[0068] Both the front end plate 21 and the rear end plate 22 are quadrilateral structures. A front corner hole is formed at each of the four corners of the front end plate 21. These front corner holes include a, b, c, and d. The a front corner hole corresponds to corner hole A1111, the b front corner hole corresponds to corner hole B1112, the c front corner hole corresponds to corner hole C1113, and the d front corner hole corresponds to corner hole D1114. A connector is provided at each of the a, b, c, and d front corner holes, connecting to an outer tube. Specifically, the connectors include a first connector 211, a second connector 212, a third connector 213, and a fourth connector 214. The first connector 211 is located at the a front corner hole, the second connector 212 at the b front corner hole, the third connector 213 at the c front corner hole, and the fourth connector 214 at the d front corner hole. Each connector connects to a tube, and the flow area of ​​the first connector 211 is larger than that of the fourth connector 211. The flow area of ​​the second connector 212 is greater than that of the third connector 213. The heat exchange plate 1 includes a first heat exchange plate, a second heat exchange plate, and a third heat exchange plate arranged sequentially. The cavity includes a first cavity and a second cavity. The first cavity is formed between the first heat exchange plate and the second heat exchange plate, and the second cavity is formed between the second heat exchange plate and the third heat exchange plate. The first connector 211 and the fourth connector 214 are both connected to the first cavity, and the second connector 212 and the third connector 213 are both connected to the second cavity. The first fluid from the outside can enter the first cavity through the first connector 211 and then exit through the fourth connector 214. The second fluid from the outside can enter the second cavity through the second connector 212 and then exit through the third connector 213. When the first fluid flows through the first cavity, it exchanges heat with the second fluid flowing through the second cavity. The first fluid and the second fluid are fluids of the same type or different types of fluids with different temperatures.

[0069] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A heat exchange micro-element for a heat exchange plate; characterized in that, The heat exchange micro-element includes a protrusion and a plurality of sub-recesses surrounding the protrusion; the protrusion and each sub-recess are connected by a curved surface, the curved surface being a multi-segment structure including a first curved surface segment, a second curved surface segment, and a transition surface segment located between the first curved surface segment and the second curved surface segment. The first curved surface segment is connected to the protrusion, and the second curved surface segment is connected to the sub-recessed portion, and the curvature direction of the first curved surface segment is different from that of the second curved surface segment; The heat exchange micro-element is a three-dimensional polygonal surface. Each corner of the polygonal surface is provided with a sub-recessed portion, and the center point of the polygonal surface is provided with a protrusion. The edges of the polygonal surface are all arc lines, and the protrusion direction of the arc lines is consistent with the protrusion direction of the protrusion. Two adjacent curved surfaces form a transition curve that connects the center point of the polygonal surface and the midpoint of the arc line, and the transition curve includes a first curve and a second curve connected to the first curve; the first curve is close to the center point of the polygonal surface, and the second curve is close to the midpoint of the arc line; The curvature directions of the first curve and the second curve are different, the curvature radii of the first curve and the second curve are equal, and the lengths of the first curve and the second curve are equal.

2. The heat exchange micro-element according to claim 1, characterized in that, Both the protrusion and the recess are planar; the first curved surface segment is a convex curved surface, the first curved surface segment protrudes towards one side of the protrusion, and one end of the first curved surface segment is tangent to the protrusion, and the other end of the first curved surface segment is tangent to the transition surface segment; The second curved surface segment is a concave surface, which is concave to one side of the sub-recessed portion, and one end of the second curved surface segment is tangent to the sub-recessed portion, while the other end of the second curved surface segment is tangent to the transition surface segment.

3. The heat exchange micro-element according to claim 2, characterized in that, The point of tangency between the protrusion and the first curved surface segment is A, and the point of tangency between the sub-recessed portion and the second curved surface segment is B; satisfying: θ < 0.05°; Wherein, θ is the angle between line a and line b, line a is a line passing through point A and tangent to both the protrusion and the first curved surface segment, and line b is a line passing through point B and tangent to both the sub-concave portion and the second curved surface segment.

4. A heat exchange plate, characterized in that, The device includes a main plate, which forms a main heat exchange zone; the main heat exchange zone is composed of a plurality of heat exchange micro-elements as described in any one of claims 1 to 3, and the plurality of adjacent heat exchange micro-elements are spliced ​​together to form a plurality of sub-recesses.

5. The heat exchange plate according to claim 4, characterized in that, The main plate further includes a first plane, a second plane, and a central plane; the first plane and the second plane are arranged opposite to each other, and the central plane is located between the first plane and the second plane; the protrusion of each heat exchange micro-element is located on the first plane and protrudes from the central plane toward the first plane; the sub-recess of each heat exchange micro-element is located on the second plane and concave from the central plane toward the second plane; the area of ​​the protrusion is larger than the area of ​​the recess; The central plane is a plane passing through the center point of the main body plate.

6. The heat exchange plate according to claim 5, characterized in that, Satisfies: 0.4 < s0 / s < 0.6; Wherein, s0 is the distance between the midpoint of the arc line of the heat exchange micro-element and the first plane, and s is the distance between the protrusion and the recess.

7. The heat exchange plate according to claim 5, characterized in that, In the multiple heat exchange micro-elements arranged sequentially around the same point, the lines connecting the projections of the center points of the multiple recesses onto the central plane form a regular polygon, and the projection of the center point of the protrusion onto the central plane is the center point of the regular polygon.

8. The heat exchange plate according to claim 5, characterized in that, The heat exchange plate also includes a side plate, which is connected to the edge of the main plate; satisfying: cosα=h / (h+s); Wherein, α is the angle between the side plate surface and the center plane, s is the distance between the protrusion and the recess, and h is the thickness of the main plate.

9. A plate heat exchanger, characterized in that, It includes a front end plate, a rear end plate, and a heat exchange plate as described in any one of claims 4 to 8, wherein multiple heat exchange plates are provided, and the multiple heat exchange plates are stacked sequentially between the front end plate and the rear end plate; a cavity is formed between two adjacent heat exchange plates.

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