Heat exchanger and method for manufacturing a heat exchanger

Abstract

The application provides a heat exchanger and a preparation method thereof. The heat exchanger comprises a plurality of working fluid channel sheets stacked along an O-Z direction. The working fluid channel sheet comprises an inlet, an outlet, and a heat exchange zone between the inlet and the outlet. The heat exchange zone is provided with a plurality of microstructures formed by stamping. The center points of the microstructures on adjacent working fluid channel sheets are aligned along the O-Z direction, and the shapes of the microstructures on adjacent working fluid channel sheets are different. According to the application, the center points of the microstructures on adjacent working fluid channel sheets are aligned along the O-Z direction but the shapes are different. Each microstructure has a part of the area not corresponding to the cavity of the adjacent working fluid channel sheet, and the part of the area is combined with the area around the cavity to realize atomic diffusion combination.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and more specifically to a heat exchanger and its manufacturing method. Background Technology

[0002] A heat exchanger is a system used to transfer heat between two or more fluids. Based on the property that heat is transferred from a high temperature to a low temperature, it transfers heat from a hot fluid to a cold fluid to heat or cool an object.

[0003] Microchannel heat exchangers are a novel type of heat exchanger, formed by alternately stacking working fluid channel plates with refrigerant channels and working fluid channels. However, both the refrigerant channels and working fluid channels are formed through physical or chemical etching, which consumes a lot of materials, has high manufacturing costs, low production efficiency, and causes some environmental pollution.

[0004] In view of this, it is necessary to provide a new heat exchanger and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to provide a heat exchanger and its preparation method.

[0006] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A heat exchanger includes a plurality of working fluid channel plates stacked along the OZ direction. Each working fluid channel plate includes an inlet, an outlet, and a heat exchange zone located between the inlet and the outlet. The heat exchange zone has a plurality of stamped microstructures. The center points of the microstructures on adjacent working fluid channel plates are aligned along the OZ direction, and the shapes of the microstructures on adjacent working fluid channel plates are different. The stacked working fluid channel plates include a plurality of alternately stacked first working fluid channel plates and a plurality of second working fluid channel plates. The microstructures include a first microstructure disposed on the first working fluid channel plates and a second microstructure disposed on the second working fluid channel plates. The first microstructure includes at least one first edge portion extending beyond the second microstructure along the OY direction, and the second microstructure includes at least one second edge portion extending beyond the first microstructure along the OX direction. Alternatively, the length of the first microstructure along the OY direction is greater than its length along the OX direction, the length of the second microstructure along the OY direction is less than its length along the OX direction, and the length of the first microstructure along the OY direction is greater than its length along the OY direction, and the length of the first microstructure along the OX direction is less than its length along the OX direction.

[0008] Furthermore, the first edge portion is fitted around the second cavity corresponding to the other side of the second microstructure, and the second edge portion is fitted around the first cavity corresponding to the other side of the first microstructure.

[0009] Furthermore, the projections of the first edge portion and the second edge portion along the OZ direction in the O-XY plane do not overlap.

[0010] Furthermore, the projection of the center point of the first microstructure along the OZ direction into the O-XY plane is denoted as the center of a circle, and the projections of the first edge portion and the second edge portion are spaced apart along the circumferential direction of this center.

[0011] Furthermore, the first microstructure is elliptical or gourd-shaped, and the second microstructure is rhomboid, or spindle-shaped with included angles at both ends along its longitudinal direction, or circular.

[0012] Furthermore, both ends of the first microstructure along the OY direction extend beyond the second microstructure, and both ends of the second microstructure along the OX direction extend beyond the first microstructure.

[0013] A method for preparing a heat exchanger includes the following steps: A first working fluid channel plate is formed, the first working fluid channel plate includes a first inlet, a first outlet, and a first heat exchange zone located between the first inlet and the second inlet, the first heat exchange zone having a plurality of first microstructures formed by stamping; A second working fluid channel plate is formed, the second working fluid channel plate includes a second inlet, a second outlet, and a second heat exchange zone located between the second inlet and the second outlet. The second heat exchange zone has a plurality of second microstructures formed by stamping, and the first microstructures and the second microstructures have different shapes. The first working fluid channel plate and the second working fluid channel plate are stacked alternately along the OZ direction, the center points of the first microstructure and the second microstructure are aligned along the OZ direction, a number of first inlets are aligned along the OZ direction, a number of second inlets are aligned along the OZ direction, and a number of first inlets, a number of first outlets, a number of second inlets and a number of second outlets are staggered along the O-XY direction. The stacked first working fluid channel sheet and the second working fluid channel sheet are bonded together by atomic diffusion; The projections of the first edge portion and the second edge portion along the OZ direction in the O-XY plane do not overlap; Alternatively, in the O-XY plane, at least one first edge of the first microstructure along the OY direction extends beyond the second microstructure, and at least one second edge of the second microstructure along the OX direction extends beyond the first microstructure; Alternatively, the projection of the center point of the first microstructure along the OZ direction into the O-XY plane can be denoted as the center of a circle, and the projections of the first edge portion and the second edge portion can be offset along the circumferential direction of the center of the circle. Alternatively, the length of the first microstructure along the OY direction is greater than the length along the OX direction, the length of the second microstructure along the OY direction is less than or equal to the length along the OX direction, and the length of the first microstructure along the OY direction is greater than the length of the second microstructure along the OY direction, and the length of the first microstructure along the OX direction is less than the length of the second microstructure along the OX direction. Alternatively, the first microstructure may be elliptical or gourd-shaped, and the second microstructure may be rhomboid, spindle-shaped with included angles at both ends along its longitudinal direction, or circular. Both ends of the first microstructure along the OY direction may extend beyond the second microstructure, and both ends of the second microstructure along the OX direction may extend beyond the first microstructure.

[0014] The beneficial effects of this invention are: by aligning the center points of the microstructures on adjacent working fluid channel plates along the OZ direction but with different shapes, each microstructure has a portion of its area that does not correspond to the cavity of the adjacent working fluid channel plate, and overlaps with the area around the cavity to achieve atomic diffusion bonding. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the heat exchanger in one embodiment of the present invention; Figure 2 yes Figure 1 A partial exploded view from another angle; Figure 3 yes Figure 1 A schematic diagram of several microstructure plates and gaskets stacked in the heat exchanger shown, with the stacked situation displayed in perspective view; Figure 4 yes Figure 3 A magnified view of a portion of the image; Figure 5 yes Figure 1 A schematic diagram of the first microstructure sheet and the spacer of the first microstructure sheet stacked together; Figure 6 yes Figure 5 A schematic diagram of the structure of the first microstructure piece in the middle; Figure 7 yes Figure 5 A schematic diagram of the structure of the gasket in the first microstructure sheet; Figure 8 yes Figure 1 A schematic diagram of the second microstructure sheet and the spacer of the second microstructure sheet after being stacked; Figure 9 yes Figure 8 A schematic diagram of the structure of the second microstructure piece in the middle; Figure 10 yes Figure 8 A schematic diagram of the structure of the gasket in the second microstructure sheet; Figure 11 This is a schematic diagram of the structure of the first sheet in a preferred embodiment; Figure 12 This is a schematic diagram of several microstructure sheets and gaskets stacked together in another embodiment of the present invention, showing the stacked situation in perspective view form; Figure 13 yes Figure 12 A magnified view of a portion of the image; Figure 14 yes Figure 12 A schematic diagram of the structure of the first microstructure piece in the middle; Figure 15 yes Figure 12 A schematic diagram of the structure of the gasket in the first microstructure sheet; Figure 16 yes Figure 12 A schematic diagram of the structure of the second microstructure piece in the middle; Figure 17 yes Figure 12 A schematic diagram of the structure of the gasket in the second microstructure sheet. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0017] In the various illustrations of this invention, for ease of illustration, certain dimensions of structures or parts may be exaggerated relative to other structures or parts; therefore, only the basic structure of the subject matter of this invention is used to illustrate the invention.

[0018] This invention, based on the "thermal resistance balance theory," stamping process, and atomic diffusion combined process, aims to design a heat exchanger 100 with low manufacturing cost, suitable for mass production, compact structure, and good heat exchange performance, as well as its preparation method. However, some parts of the design can also be used for heat exchangers 100 manufactured by other processes.

[0019] Figures 1-11 This is a first type of embodiment of the present invention. Figures 12-17 This is a second type of embodiment of the present invention. For ease of description, a coordinate system O-XYZ is defined.

[0020] The heat exchanger 100 includes a plurality of working fluid channel plates 1, which generally extend along the O-XY direction. The plurality of working fluid channel plates 1 are stacked along the OZ direction, and a working fluid channel for the flow of working fluid is formed between two adjacent working fluid channel plates 1. The edge of the working fluid channel plate 1 has an inlet 2 and an outlet 3 communicating with the working fluid channel, and the inlet 2 and outlet 3 of two adjacent working fluid channel plates 1 are staggered along the O-XY direction.

[0021] Two adjacent working fluid channels are used to circulate a first working fluid and a second working fluid, respectively, and heat transfer occurs when there is a temperature difference between them. The first working fluid and the second working fluid refer to two working fluids that exchange heat according to a set configuration. They can be made of the same material but have different temperatures, or they can be made of different materials and have different temperatures.

[0022] The following describes the common features of the two types of embodiments.

[0023] Please see Figures 1-17 The working fluid channel plate 1 includes an inlet 2, an outlet 3, and a heat exchange zone 4 located between the inlet 2 and the outlet 3. The heat exchange zone 4 is provided with several microstructures 5, which divide the working fluid channel into several parallel or cross-connected microchannels to improve the heat exchange performance of the heat exchanger 100.

[0024] The size and spacing of the microstructures 5 affect the heat transfer performance and pressure loss. In a preferred embodiment, the equivalent diameter of the microstructure 5 is no greater than 0.7 mm, preferably no less than 0.5 mm; the spacing between two adjacent microstructures 5 is between 0.5 mm and 2.5 mm, preferably between 1 mm and 1.5 mm.

[0025] Specifically, the working fluid channel plate 1 further includes a dam 6 surrounding the heat exchange zone 4. The dam 6 is located on the side where the microstructure 5 is located, preventing the working fluid from flowing outward. The inlet 2 and the outlet 3 are located on the dam 6 or on the inner side of the dam facing the heat exchange zone 4.

[0026] The microstructures 5 are arranged at intervals along several sinusoidal lines, with these sinusoidal lines extending from the side where the inlet 2 is located to the side where the outlet 3 is located. The arrangement of the microstructures 5 along sinusoidal lines allows them to function as sinusoidal flow-guiding structures, simplifying the production of the microstructures 5 and simultaneously ensuring that the working fluid tends to flow along a sinusoidal line, resulting in good flow turbulence and guaranteeing heat exchange performance.

[0027] In a preferred embodiment, the inlet 2 and the outlet 3 are respectively located on both sides of the heat exchange zone 4 along the OY direction. The sine lines extend along the OX direction, and several sine lines are arranged at intervals along the OY direction. After the working fluid enters the working fluid channel from the inlet 2, it is disturbed by several microstructures 5, like waves on the beach, with the later waves pushing the earlier waves to gradually move downstream to the outlet 3. The several microstructures 5 induce the fluid to form a phenomenon of successive flows, resulting in large disturbance to the fluid and good heat exchange performance.

[0028] Preferably, the spacing between the plurality of microstructures 5 arranged along the sinusoidal line in the OX direction is the same, that is, the plurality of microstructures 5 distributed along the sinusoidal line are projected onto the same straight line in the OY direction, and these projections are uniformly distributed in the OX direction. Therefore, when adjacent working fluid channel plates 1 are superimposed on each other, the support / connection points of two adjacent working fluid channel plates 1 are uniform.

[0029] Furthermore, the microstructures 5 distributed along two adjacent sinusoidal lines are staggered along the OX direction, meaning that the projection of each microstructure 5 along the OY direction onto an adjacent sinusoidal line is located in the middle of two adjacent microstructures 5 on that projected sinusoidal line. This further improves the uniformity of the support / connection points throughout the region, while also increasing the disturbance to the working fluid and improving heat transfer performance.

[0030] Furthermore, in the direction from the side where inlet 2 is located to the side where outlet 3 is located, the heat exchange zone 4 includes a turbulent zone 43 and transition zones 44 located on both sides of the turbulent zone 43. The arrangement density of microstructures 5 in the turbulent zone 43 is greater than the arrangement density of microstructures 5 in the transition zone 44. Specifically, the number of microstructures 5 on any sine line in the transition zone 44 is less than the number of microstructures 5 on any sine line in the turbulent zone 43; and / or, the distance between two adjacent sine lines in the transition zone 44 is greater than the distance between two adjacent sine lines in the turbulent zone 43.

[0031] like Figure 3 , Figures 5-6 , Figures 8-9 , Figures 11-12 , Figure 14 and Figure 16 As shown, the number of microstructures 5 on any sinusoidal line in the transition zone 44 is less than the number of microstructures 5 on any sinusoidal line in the turbulent zone 43; the spacing between two adjacent sinusoidal lines in the turbulent zone 43 and the transition zone 44 is the same, preferably the minimum value that can be achieved by the current process, which ensures heat exchange performance while shortening the size of the heat exchanger 100 along the OY direction.

[0032] Setting the turbulent region 43 can improve the heat transfer performance of the heat transfer region 4 of the same area by 30%, and the wider the turbulent region 43 is along the OY direction, the better the heat transfer performance. The width of the turbulent region 43 is set as follows: 1) the width of the turbulent region 43 is ≤3mm, preferably 2mm~3mm; or 2) the width of the turbulent region 43 can accommodate ≤3 of the above-mentioned sine lines, preferably 2~3 of the sine lines.

[0033] Both of the above width settings take into account factors such as the heat transfer performance of the turbulent region 43, the size of the heat exchanger 100, the manufacturing process, and pressure loss. Under the premise of ensuring heat transfer performance, the length of the heat exchanger 100 along the OY direction is minimized, saving materials and occupying less space. If the turbulent region 43 is further widened, the improvement in heat transfer performance will not be significant, but the pressure loss and flow loss will be greatly increased.

[0034] Furthermore, during the stamping process to form the microstructure 5, a corresponding cavity is formed on its other side. If the microstructures 5 and their arrangement are identical on two adjacent working fluid channel sheets 1, during stacking, the microstructure 5 of one working fluid channel sheet 1 is directly opposite the corresponding cavity on the other working fluid channel sheet 1, making it impossible to achieve atomic diffusion bonding under force. To solve this technical problem, such as... Figures 3-4 , Figures 12-13 As shown, the center points of the microstructures 5 of two adjacent working fluid channel plates 1 are aligned along the OZ direction, that is, the line connecting the two center points is parallel to the OZ direction. The support / bonding points of two adjacent working fluid channel plates 1 are aligned to avoid the problem of the bonding point breaking due to the different pressures of the two working fluids. At the same time, the shapes of the microstructures 5 of two adjacent working fluid channel plates 1 are different. Therefore, a part of each microstructure 5 does not correspond to the cavity of the adjacent microstructure plate 13, and overlaps with the area around the cavity to achieve atomic diffusion bonding.

[0035] When the microstructure 5 is a symmetrical figure, its central symmetrical point is the center point; when the microstructure 5 is an asymmetrical figure, the center point is the center point of the equivalent circle with equal area after its edges are normalized.

[0036] For the first working fluid and the second working fluid, the working fluid channel plate 1 is divided into two types. The heat exchanger 100 includes a first working fluid channel plate 11 and a second working fluid channel plate 12 alternately stacked along the OZ direction. The first working fluid channel plate 11 includes a first microstructure 51 formed by stamping and a first cavity; the second working fluid channel plate 12 includes a second microstructure 52 formed by stamping and a second cavity. The first microstructure 51 and the second microstructure 52 are different. The first working fluid channel plate 11, the first microstructure 51 and the second working fluid channel plate 12 define a first working fluid channel, and the second working fluid channel plate 12, the second microstructure 52 and the first working fluid channel plate 11 define and form a second working fluid channel.

[0037] See Figures 3-4 , Figures 12-13 The diagram illustrates the superposition of the first microstructure 51 and the second microstructure 52. In the O-XY direction, a portion of the first edge 511 of the first microstructure 51 extends beyond the second microstructure 52, that is, the projection of a portion of the first edge 511 along the OZ direction onto the second working fluid channel piece 12 extends beyond the second microstructure 52. This extended portion fits against the periphery of the second cavity, serving as a support / bonding point when adjacent working fluid channel pieces 1 are superimposed; and / or, a portion of the second edge 521 of the second microstructure 52 extends beyond the first microstructure 51, that is, the projection of this portion of the second edge 521 along the OZ direction onto the first working fluid channel piece 11 extends beyond the first microstructure 51. This extended portion fits against the periphery of the first cavity, serving as a support / bonding point when adjacent working fluid channel pieces 1 are superimposed.

[0038] Preferably, to ensure effective atomic diffusion bonding, the area of ​​each excess portion is not less than 0.04 mm. 2 Preferred size: 0.04 mm 2 ~0.06mm 2， For example, 0.05 mm 2 Considering the chamfering issue of the protruding edges during processing, the length of the first edge portion 511 extending beyond the second microstructure 52 in the OY direction is not less than 0.15mm; the length of the second edge portion 521 extending beyond the first microstructure 51 in the OY direction is not less than 0.15mm. The two extension lengths can be the same or different.

[0039] The first microstructure 51 and the second microstructure 52 are projected along the OZ direction onto the same O-XY plane. The first edge portion 511 and the second edge portion 521 do not overlap, and the support / bonding points are distributed in different areas. Preferably, the projection of the center point of the first microstructure 51 is taken as the center of a circle, and the projections of the first edge portion 511 and the second edge portion 521 are uniformly arranged along the circumferential direction of this center, resulting in more uniform support / bonding force. More preferably, the projections of the first edge portion 511 and the second edge portion 521 are at different distances from the center of the circle, and are arranged in multiple layers, inner and outer, for a better support / bonding effect.

[0040] In one embodiment, at least one, preferably two, first edge portions 511 of the first microstructure 51 extend beyond the second microstructure 52 along the OY direction; at least one, preferably two, second edge portions 521 of the second microstructure 52 extend beyond the first microstructure 51 along the OX direction, forming a four-corner support for stronger bonding.

[0041] In another embodiment, the length of the first microstructure 51 along the OY direction is greater than the length along the OX direction, the length of the second microstructure 52 along the OY direction is less than or equal to the length along the OX direction, and the length of the first microstructure 51 in the OY direction is greater than the length of the second microstructure 52, while the length of the first microstructure 51 in the OX direction is less than the length of the second microstructure 52.

[0042] For example, the first microstructure 51 is elliptical or gourd-shaped, and the second microstructure 52 is rhomboid, or spindle-shaped with the two ends of the longitudinal direction being at an angle, or circular. Furthermore, both ends of the first microstructure 51 along the OY direction extend beyond the second microstructure 52, and both ends of the second microstructure 52 along the OX direction extend beyond the first microstructure 51.

[0043] When the heat exchanger 100 is formed by stacking, the first working fluid channel plate 11 and the second working fluid channel plate 12 are stacked alternately along the OZ direction, and the center points of the first microstructure 51 and the second microstructure 52 are aligned along the OZ direction, which can ensure that adjacent working fluid channel plates 1 can support and connect with each other.

[0044] Furthermore, the heat exchanger 100 has diverse applications. For example, when used as a condenser or evaporator in a refrigeration system, the first working fluid is a high-pressure, two-phase refrigerant, and the second working fluid is low-pressure, single-phase water. To accommodate working fluids of different temperatures and / or phases and / or pressures, the first working fluid channel plate 11 includes a first heat exchange zone 41 with a first microstructure 51, a first inlet 21 communicating with the first heat exchange zone 41, and a first outlet 31. The second working fluid channel plate 12 includes a second heat exchange zone 42 with a second microstructure 52, a second inlet 22 communicating with the second heat exchange zone 42, and a second outlet 32. The side of the first microstructure 51 facing the first inlet 21 has a different shape than the side of the second microstructure 52 facing the second inlet 22, and the parts that first contact the first and second working fluids are different. This design is tailored to different working fluids, balancing heat exchange performance and pressure loss.

[0045] In one embodiment, the first microstructure 51 is arc-shaped on the side facing the first inlet 21, which makes the stamping die design easy and the production yield high. For example, the first microstructure 51 is elliptical or gourd-shaped.

[0046] The second microstructure 52 has a pointed angle on the side facing the inlet 2, with an included angle of no more than 90°, resulting in low flow loss and good heat exchange performance between the second working fluid and the second microstructure 52 based on the frontal effect; for example, the second microstructure is rhomboid or spindle-shaped with included angles at both ends in the longitudinal direction.

[0047] The structure of dam 6 is described in detail below.

[0048] The inner edge 143 of the dam 6 facing the heat exchange zone 4 is in contact with the working fluid and has a certain influence on its flow. In this invention, the shape of part of the inner edge 143 is the same as the arrangement shape of the row of microstructures 5 closest to the inner edge 143, and the turbulence tendency of the edge 143 on the working fluid is the same as that of the adjacent microstructures 5.

[0049] Specifically, the shape of the inner edge 143 extending along the flow direction of the working fluid is the same as the arrangement of the row of microstructures 5 near the inner edge 143. Therefore, the flow trend of the working fluid at the edge is substantially the same as that of the working fluid in the middle region. Here, the flow direction of the working fluid is not the actual flow direction, but refers to the flow from the side where the inlet 2 is located to the side where the outlet 3 is located. Preferably, the distance between the inner edge 143 extending along the flow direction of the working fluid and the row of microstructures 5 near the inner edge is the same; the turbulence tendency of different regions on the working fluid is the same.

[0050] The inlet 2 and the outlet 3 are respectively located on opposite sides of the dam 6. The shape of the inner edge 143 on the side where the inlet 2 is located is consistent with the arrangement shape of the row of microstructures 5 closest to this inner edge. This inner edge is equivalent to the row of microstructures 5 upstream of the nearest row of microstructures 5. The thrust and resistance to the working fluid in the direction of the working fluid's movement are similar, avoiding a large rebound of the working fluid at the edge of the heat exchange zone 4, which would cause greater flow loss. Preferably, the distance between the inner edge 143 on the side where the inlet 2 is located and the row of microstructures 5 closest to this inner edge 143 is equal, and the turbulence trend of the working fluid is the same in different areas.

[0051] And / or, the shape of the inner edge 143 on the side where the outlet 3 is located is consistent with the arrangement shape of the row of microstructures 5 closest to the inner edge 143, and the inner edge is equivalent to the row of microstructures 5 downstream of the nearest row of microstructures 5; the thrust and resistance to the working fluid in the direction of the working fluid's advance are similar, avoiding a large rebound of the working fluid at the edge of the heat exchange zone 4, which would cause greater flow loss. Preferably, the shape of the inner edge 143 on the side where the outlet 3 is located is equal to the distance between the row of microstructures 5 closest to the inner edge 143, and the turbulence trend of different regions to the working fluid is the same.

[0052] In one specific embodiment, the inlet 2 and the outlet 3 are respectively located on both sides of the dam 6 along the OY direction. A plurality of microstructures 5 are distributed along the OX direction in a plurality of sinusoidal lines, and the microstructures 5 on adjacent sinusoidal lines are staggered along the extension direction of the sinusoidal lines. A row of microstructures 5 located at the edge along the flow direction of the working fluid is wavy. The inner edges 143 on both sides of the dam 6 along the OY direction are also sinusoidal, and the inner edges 143 extending along the flow direction of the working fluid are wavy.

[0053] Furthermore, the gap between each inner edge 143 and the microstructure 5 is the same as the gap between adjacent microstructures 5 in the same direction, thus having the same turbulence effect on the working fluid.

[0054] The following describes the distribution of inlet 2 and outlet 3 on the two working fluid channel plates.

[0055] On the same working fluid channel plate 1, the inlet 2 and the outlet 3 are located on opposite sides in the OY direction and are staggered along the OX direction, that is, the inlet 2 and the outlet 3 are arranged diagonally. The long flow distance of the working fluid improves the heat exchange performance.

[0056] Preferably, the first inlet 21 and the second outlet 32 ​​are located on one side of the heat exchanger 100, and the first outlet 31 and the second inlet 22 are located on the other side of the heat exchanger 100; therefore, all inlets 2 and outlets 3 are arranged on opposite sides of the heat exchanger 100, which facilitates subsequent processes such as connecting external inlet and outlet pipes, and the structure is more compact and occupies less space.

[0057] Preferably, the first inlet 21 and the second outlet 32 ​​are arranged side by side along the OX direction; the second inlet 22 and the first outlet 31 are arranged side by side along the OX direction; therefore, the first inlet 21 and the first outlet 31 are diagonally arranged, and the second inlet 22 and the second outlet 32 ​​are diagonally arranged, so that the first working fluid and the second working fluid are generally in opposite directions, resulting in good heat exchange effect.

[0058] When the heat exchanger 100 is used as a condenser, the first working fluid is a two-phase, high-pressure refrigerant with a large temperature difference between it and the working fluid channel plate 1, and the second working fluid is low-pressure water. In one embodiment, along the OX direction, the width of the second outlet 32 ​​is greater than the width of the first inlet 21, and the width of the second inlet 22 is greater than the width of the first outlet 31, ensuring the water flow rate and the temperature after heat exchange. In another embodiment, the widths of the first inlet 21 and the first outlet 32 ​​are different. The gaseous refrigerant, with higher pressure, enters from the wider first inlet 21, and then the liquid refrigerant flows out from the narrower first outlet 32, maintaining pressure balance throughout the flow process. The widths of the second inlet 22 and the second outlet 32 ​​are the same, ensuring smooth water flow. When the heat exchanger 100 is used as an evaporator, the first inlet and the first outlet are reversed.

[0059] The working fluid channel piece 1 will be further described in detail below in conjunction with the manufacturing process.

[0060] When the working fluid channel sheet 1 is integral, it is only suitable for forming the microstructure 5 and the dam 6 on a thicker sheet through physical / chemical etching processes, and is not suitable for stamping processes.

[0061] Please refer to Figures 1-17 This invention designs the working fluid channel plate 1 as a split type, which includes microstructure plates 13 stacked along the OZ direction and gaskets 14 of the microstructure plates (hereinafter referred to as gaskets). Specifically, the first working fluid channel plate 11 includes a first microstructure plate 131 and a gasket 141 of the first microstructure plate (hereinafter referred to as the first gasket 141); the second working fluid channel plate 12 includes a second microstructure plate 132 and a gasket 142 of the second microstructure plate (hereinafter referred to as the second gasket 142). The first microstructure plate 131 and the second microstructure plate 132 are collectively referred to as microstructure plate 13, and the first gasket 141 and the second gasket 142 are collectively referred to as gasket 14.

[0062] Viewed from the OZ direction, the microstructure piece 13 has the same shape as the working fluid channel piece 1, and the microstructure piece 13 includes the heat exchange zone 4 and an edge zone surrounding the heat exchange zone 4. The gasket 14 has the same shape as the edge zone, and the gasket 14 is disposed on the side where the microstructure 5 is located in the edge zone, forming the dam 6 around the heat exchange zone 4; all the above descriptions of the dam 6 apply to the gasket 14.

[0063] This invention divides the working fluid channel plate 1 into two parts along the OZ direction and sets the microstructure 5 on the microstructure plate 13. The microstructure plate 13 and the gasket 14 can be formed by stamping, and then the plates are stacked together to form the dam 6 through the gasket 14. Therefore, there is no cavity on the other side corresponding to the dam 6, and the two can be further bonded together by atomic diffusion. Compared with the traditional photolithography process, the production cost is low, it is suitable for mass production, and the environmental pollution is small.

[0064] The smaller the thickness of the microstructure sheet 13 and the gasket 14, the lighter the weight, the lower the thermal resistance, and the better the heat exchange performance of the final heat exchanger 100. Due to limitations in current sheet metal properties and stamping processes, the thickness of the microstructure sheet 13 and the gasket 14 is between 0.07 mm and 0.1 mm, for example, 0.1 mm, 0.09 mm, 0.08 mm, 0.075 mm, and 0.07 mm. This invention preferably uses a thickness below 0.1 mm for lower thermal resistance, but this presents a significant challenge to the manufacturing process.

[0065] The microstructure 5 formed by stamping the heat exchange zone 4 of the microstructure sheet 13 is a hollow protrusion. The gaps between several microstructures are connected to form the microchannel, which divides the fluid into several small streams for heat exchange, thereby improving the heat exchange performance.

[0066] The greater the thickness of the microstructure sheet 13, the larger the diameter and strength of the microstructure 5, and the smaller the spacing between adjacent microstructures 5. This results in stronger pressure resistance of the microstructure sheet 13 to the first and second working fluids located on either side of it; conversely, the pressure resistance is lower. The thickness of the microstructure sheet 13 is determined by the thickness of the sheet material. The height of the microstructure 5 is not less than the thickness of the gasket 14, preferably both are the same height. During superimposed pressurization, the slightly taller microstructure 5 can undergo slight deformation, ensuring effective contact between the microstructure 5 and adjacent microstructure sheets 13, a necessary condition for atomic diffusion bonding. Specifically, the thickness of the gasket 14 is less than or equal to the thickness of the microstructure sheet 13, and the height of the microstructure is adaptively adjusted according to the thickness of the gasket 14. In this invention, the gasket 14 and the microstructure sheet 13 have the same thickness and are formed from the same sheet material.

[0067] Taking into account the performance of both the stamping die and the microstructure sheet, the equivalent diameter of the microstructure 5 is no greater than 0.7 mm, preferably no less than 0.5 mm, and the spacing between two adjacent microstructures 5 is between 0.5 mm and 2.5 mm, preferably between 1 mm and 1.5 mm.

[0068] The gasket 14 surrounds the heat exchange zone 4 to form a dam 6 for the working fluid channel. The width of the gasket 14 is designed according to the pressure resistance of the heat exchanger 100 and the atomic diffusion bonding process, for example, between 2.5 mm and 5 mm, preferably 3 mm.

[0069] The outer contour of the gasket 14 is the same as that of the heat exchanger 100, and the inner edge 143 of the heat exchange zone 4 is in contact with the working fluid, specifically referring to the inner edge 143 of the dam 6.

[0070] Furthermore, regardless of whether it is a split or integrated structure, the area around the inlet 2 and outlet 3 on the working fluid channel plate 1 has a guiding surface 10 for guiding the working fluid. The guiding surface 10 is inclined or stepped, so that when fluids such as refrigerant and water enter the heat exchange zone 4, they do not face a "wall," but rather several inlets with guiding surfaces 10. In the split structure, the guiding surface 10 is formed by the microstructure plate and the gasket of the microstructure plate. For example, uneven edges and uneven inner and outer layers constitute a stepped guiding surface 10.

[0071] Preferably, the drainage surface 10 is located between the inlet 2 and the heat exchange zone 4, or between the outlet 3 and the heat exchange zone 4.

[0072] Alternatively, preferably, the arc angle of the inlet 2 and the outlet 3 on the side facing the heat exchange zone 4 is smaller than the arc angle on the side away from the heat exchange zone 4, so as to facilitate the formation of the drainage surface 10.

[0073] The following will be referenced Figures 1-11 The design of this invention will be described in detail below: Both the first working fluid channel plate 11 and the first working fluid channel plate 12 include a heat exchange zone 4, two sets of inlets 2 and outlets 3 disposed around the heat exchange zone 4, and a surrounding frame 15. The inlets and outlets both extend along the thickness direction of the microstructure plate 13.

[0074] The heat exchange zone 4 is provided with a plurality of microstructures 5, the structure and arrangement of which are as described above and will not be repeated here. One set of inlets 2 and outlets 3 are connected to the heat exchange zone 4; the other set of inlets 2 and outlets 3 are isolated from the heat exchange zone 4 by a barrier 16, so that the working fluid entering from this inlet 2 cannot enter the heat exchange zone 4.

[0075] Taking the first working fluid channel plate 11 as an example, the first inlet 21 and the first outlet 31 are connected to the heat exchange zone 4, and the second inlet 22 and the second outlet 32 ​​are isolated from the heat exchange zone 4 by the enclosure 16. The two sets of inlets 2 and outlets 3 are explained using this example.

[0076] The distance between the first inlet 21 and the first outlet 31, which are connected to the heat exchange zone 4, and the nearest row of microstructures 5 is very small, and the distance between them and the adjacent microstructures 5 in that direction is comparable. Microstructures 5 are set in the area close to the first inlet 21 and the first outlet 31, which uniformly support the adjacent microstructure pieces 13 and form sufficient bonding strength after atomic diffusion bonding, while also ensuring the smooth passage of the first working fluid.

[0077] The second inlet 22 and the second outlet 32, which are isolated from the heat exchange zone 4, are separated from the heat exchange zone 4 by the enclosure 16. In order to ensure the isolation effect, the second inlet 22 and the second outlet 32 ​​are far apart from the nearest row of microstructures 5, which is greater than the distance between adjacent microstructures 5 in that direction.

[0078] Specifically, the distance between the first inlet 21 and the first outlet 31 and the nearest row of microstructures 5 is L1, and the distance between the second inlet 22 and the second outlet 32 ​​and the nearest row of microstructures 5 is L2, where L1 < L2. The width of the enclosure 16 is ≤ L2.

[0079] In one embodiment, in the arrangement direction of the first inlet 21 and the first outlet 31 with the nearest row of microstructures 5, L1 ≤ the distance between adjacent microstructures 5, resulting in high support / bonding strength at the inlet and outlet; and / or, in the arrangement direction of the second inlet 22 and the second outlet 32 ​​with the nearest row of microstructures 5, L2 > the distance between adjacent microstructures 5, ensuring effective isolation.

[0080] Furthermore, L2 is 1.5 to 4 times the distance between two adjacent rows of microstructures 5, for example, 2 times or 3 times.

[0081] In another embodiment, the first inlet 21 and the first outlet 31 are respectively located on both sides of the heat exchange zone 4 along the OY direction, the second inlet 22 and the second outlet 32 ​​are respectively located on both sides of the heat exchange zone 4 along the OY direction, and a plurality of microstructures 5 are distributed with a plurality of sinusoidal lines extending along the OX direction, and the plurality of sinusoidal lines are spaced apart along the OY direction.

[0082] Preferably, L1 ≤ the distance between two adjacent sine lines; and / or, L2 ≥ 1.5 to 4 times, for example 2 times or 3 times, the distance between two adjacent sine lines, and this width can accommodate 1, 2 or 3 sine lines.

[0083] In addition, the sizes of inlet 2 and outlet 3 are usually set according to the pressure and flow rate of the working fluid. In this invention, the first inlet 21 and the first outlet 31 are respectively located on both sides of the heat exchange zone 4 along the OY direction, and the second inlet 22 and the second outlet 32 ​​are also respectively located on both sides of the heat exchange zone 4 along the OY direction. In the OX direction, the width of the first inlet 21 and the first outlet 31 is smaller than the width of the second inlet 22 and the second outlet 32. When the first working fluid is a refrigerant and the second working fluid is water, the heat exchange performance and pressure loss are both optimal.

[0084] Specifically, in the OX direction, the width of the second inlet 22 and the second outlet 32 ​​is greater than 1 / 2 of the width of the heat exchange zone 4; the lateral distance between the second working fluid inlet and outlet 3 is large, and the larger the width, the more the second working fluid tends to pass through the heat exchange zone 4 in a straight line, and the smaller the pressure loss.

[0085] Preferably, the widths of the second inlet 22 and the second outlet 32 ​​are between 1 / 2 and 4 / 5 of the width of the heat exchange zone 4, for example, 2 / 3 or 3 / 4; the second working fluid channel has a simulated centerline straight-through structure, resulting in low flow loss.

[0086] In one specific embodiment, the first inlet 21 and the second outlet 32 ​​are located on one side of the heat exchange zone 4 along the OY direction, and are arranged along the OX direction; the first outlet 31 and the second inlet 22 are located on the other side of the heat exchange zone 4 along the OY direction, and are arranged along the OX direction. Preferably, in the OX direction, the first inlet 21 and the first outlet 31 are staggered, and the second inlet 22 and the second outlet 32 ​​are staggered, so that the first working fluid and the second working fluid flow in opposite directions, thereby improving the heat exchange performance.

[0087] In another embodiment, the width of the first inlet 21 is greater than the width of the first outlet 31, and the width of the second outlet 32 ​​is less than the width of the first outlet 31, which is suitable for a condenser in which the first inlet 21 is connected to a compressor.

[0088] Preferably, the width of the enclosure 16 and the frame 15 is the same to ensure a high degree of bonding at all points and to ensure that the pressure resistance of the working fluid is the same, thus avoiding leakage of the working fluid; the remaining area is allocated to the inlet 2 and outlet 3 located on the same side.

[0089] Furthermore, in order to enable the use of a stamping process, the working fluid channel sheet 1 includes microstructure sheets 13 stacked along the OZ direction and gaskets 14 of the microstructure sheets.

[0090] The microstructure sheet 13 includes the heat exchange zone 4, a first inlet through hole 21', a first outlet through hole 31', a second inlet through hole 22', a second outlet through hole 32', and a first frame corresponding to the frame 15. The first inlet through hole 21', the first outlet through hole 31', the second inlet through hole 22', and the second outlet through hole 32' all penetrate the microstructure sheet 13 along the thickness direction.

[0091] To adapt to different working fluids, the microstructure sheet 13 includes a first microstructure sheet 131 and a second microstructure sheet 132. The outer contours of the microstructure sheet 13 and the gasket 14 are the same, for example, both are square, which minimizes the use of sheet material.

[0092] The first microstructure sheet 131 includes a first heat exchange zone 41, a first inlet through hole 21' and a second outlet through hole 32' disposed on one side of the first heat exchange zone 41 along the OY direction and arranged along the OX direction, a first outlet through hole 31' and a second inlet through hole 22' disposed on the other side of the first heat exchange zone 41 along the OY direction and arranged along the OX direction, and a first enclosure frame. The first inlet through hole 21', the second outlet through hole 32', the first outlet through hole 31', the second inlet through hole 22', and the first enclosure frame are located in the edge area; and the first inlet through hole 21' and the first outlet through hole 31' communicate with the first heat exchange zone 41, while the second inlet through hole 22' and the second outlet through hole 32' are isolated from the first heat exchange zone 41 by the enclosure 16.

[0093] The second microstructure sheet 132 includes a second heat exchange zone 42, a first inlet through-hole 21' and a second outlet through-hole 32' disposed on one side of the second heat exchange zone 42 along the OY direction and arranged along the OX direction, a first outlet through-hole 31' and a second inlet through-hole 22' disposed on the other side of the second heat exchange zone 42 along the OY direction and arranged along the OX direction, and a first frame. The first inlet through-hole 21', the second outlet through-hole 32', the first outlet through-hole 31', the second inlet through-hole 22', and the first frame are disposed in the edge area. The difference from the first microstructure sheet 131 is that the first inlet through-hole 21' and the first outlet through-hole 31' are isolated from the first heat exchange zone 41 by a barrier 16, while the second inlet through-hole 22' and the second outlet through-hole 32' are connected to the first heat exchange zone 41.

[0094] Specifically, the distance between the first inlet through-hole 21' and the first outlet through-hole 31', which are isolated from the second heat exchange zone 42, and the nearest row of microstructures 5 is L1; the distance between the second inlet through-hole 22' and the second outlet through-hole 32', which are connected to the second heat exchange zone 42, and the nearest row of microstructures 5 is L2, where L1 > L2. Further, L1 > the distance between adjacent microstructures 5 in this direction; and / or, L2 ≤ the distance between adjacent microstructures 5 in this direction. Preferably, L1 is 1.5 to 4 times the distance between two adjacent rows of microstructures 5 in this direction, for example, 2 times or 3 times. Or, L1 ≥ 1.5 to 4 times the distance between two adjacent sine lines, and one or two sine lines can be accommodated within the width range of L2; and / or, L2 ≤ the distance between two adjacent sine lines.

[0095] The gasket 14 includes: a heat exchange perforated area 144 corresponding to the heat exchange zone 4, the inlet through hole 2' and the outlet through hole 3' communicating with the heat exchange zone 4, an inlet perforated area 145 corresponding to the inlet through hole 2' which is isolated from the heat exchange zone 4, an outlet perforated area 146 corresponding to the outlet through hole 3' which is isolated from the heat exchange zone 4, the enclosure 16, and a second enclosure corresponding to the enclosure frame 15.

[0096] The portion of the heat exchange perforated zone 144 corresponding to the inlet through hole 2' is called inlet 2, and the portion corresponding to the outlet through hole 3' is called outlet 3. For simplicity, the inlet through hole 2' can also be referred to as the inlet, and the outlet through hole 3' as the outlet.

[0097] The heat exchange perforated area 144, the inlet perforated area 145, and the outlet perforated area 146 extend along the thickness direction of the gasket 14. The enclosure 16 is located between the inlet perforated area 145 and the heat exchange perforated area 144, and between the outlet perforated area 146 and the heat exchange perforated area 144. The second frame encloses the perforated areas together, forming a single piece. After stacking, the first frame and the second frame constitute the enclosure 15.

[0098] The arrangement of the gasket 14 surrounding the inner edge 143 of the heat exchange perforated area 144 is the same as described above. Its shape is the same as the arrangement shape of the nearest row of microstructures 5, preferably the same as the distance between the nearest row of microstructures 5, and more preferably the same as the distance between adjacent rows of microstructures 5 in the same direction.

[0099] Specifically, the gasket 14 includes a first gasket 141 that mates with the first microstructure sheet 131 and a second gasket 142 that mates with the second microstructure sheet 132.

[0100] The first gasket 141 includes a first heat exchange perforated area corresponding to the first heat exchange zone 41, the first inlet through hole 21' and the first outlet through hole 31', a second inlet perforated area corresponding to the second inlet through hole 22', a second outlet perforated area corresponding to the second outlet through hole 32', and a second frame corresponding to the frame 15.

[0101] The second gasket 142 includes a second heat exchange perforated area corresponding to the second heat exchange zone 42, the second inlet through hole 22' and the second outlet through hole 32', a first inlet perforated area corresponding to the first inlet through hole 21', a first outlet perforated area corresponding to the first outlet through hole 31', and a second frame corresponding to the frame 15.

[0102] The present invention also uses an outer substrate 71 as a substrate and an outer working fluid inlet / outlet plate 72 as a cover. The thickness of both is between 2 and 3 mm, with strong pressure resistance, to protect the internal working fluid channel plate 1.

[0103] The fabrication methods for heat exchangers can be broadly divided into two steps: lamination and atomic diffusion.

[0104] The method for preparing the heat exchanger includes: forming a plurality of first working fluid channel plates 11; forming a plurality of second working fluid channel plates 12; after cleaning, alternately stacking the first working fluid channel plates 11 and the second working fluid channel plates 12 along the OZ direction between the outer substrate 71 and the outer working fluid inlet / outlet plates 72; and performing atomic diffusion bonding by applying pressure through a tooling fixture.

[0105] Specifically, the method for manufacturing the heat exchanger includes the following steps: stamping to form the first microstructure plate 131, the first gasket 141, the second microstructure plate 132, and the second gasket 142; after cleaning, at least one repeating unit is stacked on the outer substrate 71 in the order of the first microstructure plate 131, the first gasket 141, the second microstructure plate 132, and the second gasket 142 to a set height, and then the outer working fluid inlet / outlet plate 72 is sealed on top, and pressurized by a tooling fixture. The repeating unit can be an integer, or it can be an integer plus 1 / 4, 2 / 4, or 3 / 4 more.

[0106] All atomic diffusion bonding in the embodiments described herein was performed in a vacuum furnace at a vacuum pressure of 4 × 10⁻⁶. -3 Pa, with an applied surface pressure of 5 MPa and a temperature around 1100℃. After atomic diffusion bonding, the main body of heat exchanger 100 is completed.

[0107] After being superimposed, a plurality of first inlet through holes 21', a plurality of first heat exchange hollow areas 144, and a plurality of first inlet hollow areas constitute a first inflow cavity 81, and a plurality of second outlet through holes 32', a plurality of first heat exchange hollow areas 144, and a plurality of first outlet hollow areas constitute a first outflow cavity 83; then, a first inflow pipe 82 or a first inflow pipe connector communicating with the first inflow cavity 81 and a first outflow pipe 84 or a first outflow pipe connector communicating with the first outflow cavity 83 are connected to the external working fluid inlet / outlet plate 72. The first working fluid enters the first inflow cavity 81, is buffered and mixed, and then enters the first flow channel through a plurality of first inlets 21, and then flows out into the first outflow cavity 83.

[0108] The extension direction of the first inlet pipe 82 or the first inlet pipe connector is preferably perpendicular to the arrangement direction of the first inlet 21 and the first heat exchange zone 41. That is, the direction in which the first working fluid flows from the first inlet pipe 82 or the first inlet pipe connector into the first inlet cavity 81 is preferably perpendicular to the direction in which it flows into the first heat exchange zone 41 through the first inlet 21. This is suitable for high-pressure, two-phase first working fluids, such as refrigerants. After the first working fluid enters the first inlet cavity 81, it is bent before entering the first channel. Under the impact force, the mixing is more uniform and gas-liquid separation is avoided. Some first working fluid channels only contain gaseous working fluid, resulting in poor heat exchange performance.

[0109] A plurality of second inlet through holes 22', a plurality of second heat exchange perforated areas 144, and a plurality of second inlet perforated areas constitute a second inflow cavity 85. A plurality of second outlet through holes 32', a plurality of second heat exchange perforated areas 144, and a plurality of second outlet perforated areas constitute a second outflow cavity 87. The first frame and the second frame constitute a wall. Then, a second inflow pipe or second inflow pipe connector 86 communicating with the second inflow cavity 85 and a second outflow pipe or second outflow pipe connector 88 communicating with the second outflow cavity 87 are connected to the wall. The second working fluid enters the second inflow cavity 85, is buffered and mixed here, and then enters the second working fluid channel through a plurality of second inlets 22, and then flows out into the second outflow cavity 87.

[0110] Preferably, the extension direction of the second inlet pipe or the second inlet pipe connector 86 is consistent with the arrangement direction of the second inlet 22 and the second heat exchange zone 42. This is suitable for low-pressure, single-phase second working fluids, such as water. The second working fluid enters the second inlet chamber 85, is buffered, and then distributed into several second working fluid channels. Due to the consistent flow direction, the pressure loss is small.

[0111] Specifically, a through connection port communicating with the second inflow cavity 85 is formed by CNC machine tool cutting on the wall, and then the second inflow pipe or the second inflow pipe connector 86 is welded to the connection port. Compared with the first embodiment, the external welding of the first inflow cover plate, the first outflow cover plate, the second inflow cover plate, and the second outflow cover plate is omitted, which improves reliability. Figure 17 The diagram illustrates area A, which is the entry or exit point for machine tool cutting.

[0112] The first inlet pipe 82 or the first inlet pipe connector, the first outlet pipe 84 or the first outlet pipe connector, the second inlet pipe or the second inlet pipe connector 86, and the second outlet pipe or the second outlet pipe connector 88 are atomically diffused and then welded to the main body of the heat exchanger 100, and their order can be adjusted.

[0113] The method for preparing the heat exchanger further includes: stamping a first microstructure 51 in the first heat exchange zone 41; stamping a second microstructure 52 in the second heat exchange zone 42, wherein the first microstructure 51 and the second microstructure 52 have different shapes as described above; when stacking the sheets along the OZ direction, aligning the center points of the first microstructure 51 and the second microstructure 52 along the OZ direction can ensure that adjacent working fluid channel sheets 1 can support and combine with each other; other details are the same as described above and will not be repeated.

[0114] Furthermore, based on the identical outer contours of the microstructure sheet 13 and the gasket 14, the present invention employs the following method: at least two stamped sheets are formed on several first sheets, several second sheets, several third sheets, and several fourth sheets in the same arrangement. The stamped sheets on the first sheets include at least one of the first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132, and the second gasket 142; and the stamped sheets at corresponding positions on the first, second, third, and fourth sheets are arranged in a cyclical sequence of the first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132, the second microstructure sheet 132, and the first microstructure sheet 131; at least one repeating unit is superimposed between the outer substrate 71 and the outer working fluid inlet / outlet sheet 72 in the order of the first sheet, the second sheet, the third sheet, and the fourth sheet; then atomic diffusion bonding is performed, and after bonding, cutting is performed between adjacent stamped sheets to form several heat exchangers 100.

[0115] This method can simultaneously form multiple compact heat exchangers 4, improving production efficiency; and only requires forming positioning structures or foolproof structures or positioning and foolproof structures in the edge or middle area of ​​the first sheet, second sheet, third sheet, and fourth sheet, without the need to form positioning structures on each stamped sheet, thus saving stamped sheet material.

[0116] Preferably, such as Figure 11 As shown, the stamped sheets on the first sheet are of the same type, forming several identical micro heat exchangers 100. Furthermore, the stamped sheets on the same sheet have the same shape, facilitating production and inspection. For example, several first microstructure sheets 131 are stamped on the first sheet; the same number and consistent arrangement of first microstructure sheets 131 are stamped on the second sheet; the same number and consistent arrangement of second microstructure sheets 132 are stamped on the third sheet; and the same number and consistent arrangement of second gaskets 142 are formed on the fourth sheet.

[0117] Of course, the stamping sheets on the first sheet may also include at least two types of stamping sheets, making the stress of the entire sheet more coordinated.

[0118] Depending on the size of the sheet, the number of stamping sheets formed on the first sheet can be 2, 4, 6, or 8.

[0119] Furthermore, based on the above preparation method, the same type of gasket 14 is used adjacent to the outer substrate 71 and the outer working fluid inlet / outlet plate 72, so that the fluid on both sides of the heat exchanger 100 along the stacking direction is the same fluid. When the heat exchanger 100 is put into use, the working fluid that actively provides cooling or heating passes through the working fluid channel adjacent to the outer substrate 71 and the outer working fluid inlet / outlet plate 72, and the other passively energy-acquiring fluid is surrounded by the actively energy-acquiring fluid. That is, both sides of the passively energy-acquiring working fluid can obtain energy from the actively energy-acquiring fluid, resulting in better heat exchange performance.

[0120] For example, when the heat exchanger 100 is used as a condenser or evaporator, the first working fluid is a refrigerant and the second working fluid is water. The first gasket 141 is adjacent to the outer substrate 71 and the outer working fluid inlet / outlet plate 72. The refrigerant surrounds the water, and both sides of any water flow layer exchange heat with the refrigerant, resulting in good heat exchange performance.

[0121] Please refer to Figures 12-17 As shown, the second type of embodiment of the present invention differs from the first type of embodiment only in that: The shapes of the first inlet 21, the first outlet 31, the second inlet 22, and the second outlet 32 ​​are slightly different. The side facing the heat exchange zone 4 is designed to be more gently sloping than the other sides, which facilitates the formation of the flow-guiding surface 10.

[0122] The first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132, and the second gasket 142 are each provided with corresponding positioning holes 9. Preferably, the positioning holes are set at the four corners, which facilitates the stacking of sheets and does not affect the main structure of the heat exchange zone.

[0123] The present invention also provides a heat exchanger 100, which is formed by stacking any of the above-mentioned working fluid channel plates 1, or prepared by any of the above-mentioned heat exchanger preparation methods. The heat exchanger 100 includes a plurality of the above-mentioned working fluid channel plates 1, which are stacked along the OZ direction. A working fluid channel for the flow of working fluid is formed between two adjacent working fluid channel plates 1, and one of the adjacent working fluid channels is connected only to the first inlet 21 and the first outlet 31, and the other is connected only to the second inlet 22 and the second outlet 32.

[0124] In this embodiment, the shape and arrangement of the microstructures 5 on adjacent working fluid channel plates 1 are the same as in the first type of embodiment. The center points of the microstructures 5 on adjacent working fluid channel plates 1 are aligned along the OZ direction, and the shapes of the microstructures 5 on adjacent working fluid channel plates 1 are different; other details will not be elaborated further.

[0125] It should be noted that: in this invention, all features on the first working fluid channel plate 11 are prefixed with "first," and all features on the second working fluid channel plate 12 are prefixed with "second." "First" and "second" are used only for distinction and do not limit their structure or function. For example, the description of the heat exchange zone 4 applies to the first heat exchange zone 41 and the second heat exchange zone 42; the description of the structure and distribution of the microstructure 5 also applies to the first microstructure 51 and the second microstructure 52; others will not be listed individually.

[0126] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0127] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat exchanger, characterized in that, The device includes several working fluid channel plates stacked along the OZ direction. Each working fluid channel plate includes an inlet, an outlet, and a heat exchange zone located between the inlet and the outlet. The heat exchange zone is provided with several microstructures formed by stamping. The center points of the microstructures on adjacent working fluid channel plates are aligned along the OZ direction, and the shapes of the microstructures on adjacent working fluid channel plates are different. The stacked working fluid channel sheets include a plurality of first working fluid channel sheets and a plurality of second working fluid channel sheets stacked alternately, and the microstructure includes a first microstructure disposed on the first working fluid channel sheet and a second microstructure disposed on the second working fluid channel sheet; The first microstructure includes at least one first edge portion extending beyond the second microstructure along the OY direction, and the second microstructure includes at least one second edge portion extending beyond the first microstructure along the OX direction; Alternatively, the length of the first microstructure along the OY direction is greater than the length along the OX direction, the length of the second microstructure along the OY direction is less than or equal to the length along the OX direction, and the length of the first microstructure along the OY direction is greater than the length of the second microstructure along the OY direction, and the length of the first microstructure along the OX direction is less than the length of the second microstructure along the OX direction.

2. The heat exchanger according to claim 1, characterized in that, The first edge portion is fitted around the second cavity corresponding to the other side of the second microstructure, and the second edge portion is fitted around the first cavity corresponding to the other side of the first microstructure.

3. The heat exchanger according to claim 2, characterized in that, The projections of the first edge portion and the second edge portion along the OZ direction in the O-XY plane do not overlap.

4. The heat exchanger according to claim 3, characterized in that: The projection of the center point of the first microstructure along the OZ direction into the O-XY plane is denoted as the center of the circle, and the projections of the first edge portion and the second edge portion are spaced apart along the circumferential direction of the center of the circle.

5. The heat exchanger according to claim 1, characterized in that, The first microstructure is elliptical or gourd-shaped, and the second microstructure is rhomboid, or spindle-shaped with the two ends of its longitudinal direction forming an angle, or circular.

6. The heat exchanger according to claim 5, characterized in that, Both ends of the first microstructure extend beyond the second microstructure along the OY direction, and both ends of the second microstructure extend beyond the first microstructure along the OX direction.

7. A method for preparing a heat exchanger, characterized in that: Includes the following steps: A first working fluid channel plate is formed, the first working fluid channel plate includes a first inlet, a first outlet, and a first heat exchange zone located between the first inlet and the first outlet, the first heat exchange zone having a plurality of first microstructures formed by stamping; A second working fluid channel plate is formed, the second working fluid channel plate includes a second inlet, a second outlet, and a second heat exchange zone located between the second inlet and the second outlet. The second heat exchange zone has a plurality of second microstructures formed by stamping, and the first microstructures and the second microstructures have different shapes. The first working fluid channel plate and the second working fluid channel plate are stacked alternately along the OZ direction, the center points of the first microstructure and the second microstructure are aligned along the OZ direction, a number of first inlets are aligned along the OZ direction, a number of second inlets are aligned along the OZ direction, and a number of first inlets, a number of first outlets, a number of second inlets and a number of second outlets are staggered along the O-XY direction. The stacked first working fluid channel sheet and the second working fluid channel sheet are bonded together by atomic diffusion; The first microstructure includes at least one first edge portion extending beyond the second microstructure along the OY direction, and the second microstructure includes at least one second edge portion extending beyond the first microstructure along the OX direction; The projections of the first edge portion and the second edge portion along the OZ direction in the O-XY plane do not overlap; Alternatively, in the O-XY plane, at least one first edge of the first microstructure along the OY direction extends beyond the second microstructure, and at least one second edge of the second microstructure along the OX direction extends beyond the first microstructure; Alternatively, the projection of the center point of the first microstructure along the OZ direction into the O-XY plane can be denoted as the center of a circle, and the projections of the first edge portion and the second edge portion can be offset along the circumferential direction of the center of the circle. Alternatively, the length of the first microstructure along the OY direction is greater than the length along the OX direction, the length of the second microstructure along the OY direction is less than or equal to the length along the OX direction, and the length of the first microstructure along the OY direction is greater than the length of the second microstructure along the OY direction, and the length of the first microstructure along the OX direction is less than the length of the second microstructure along the OX direction. Alternatively, the first microstructure may be elliptical or gourd-shaped, and the second microstructure may be rhomboid, spindle-shaped with included angles at both ends along its longitudinal direction, or circular. Both ends of the first microstructure along the OY direction may extend beyond the second microstructure, and both ends of the second microstructure along the OX direction may extend beyond the first microstructure.

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