Heat exchange plate and heat exchanger thereof
By designing an asymmetrical dotted heat exchange plate, the fluid generates secondary flow and vortices within the channel, improving heat transfer efficiency and thinning the boundary layer. This solves the problem of the existing dotted heat exchange plates having poor heat transfer performance and flow resistance performance, achieving a balance between high heat transfer and pressure drop.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG FORWON PLATE HEAT EXCHANGER
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-19
AI Technical Summary
Existing polka dot heat exchange plates do not perform well in terms of heat transfer and flow resistance, and are particularly difficult to adapt to low flow resistance and high heat transfer scenarios.
A heat exchange plate is designed with an array of first and second wave points arranged in opposite directions. The concave arc surfaces are distributed on both sides to form asymmetrical first and second flow channels. The fluid generates secondary flow and vortices in the channels, which improves heat transfer efficiency and reduces the boundary layer through high shear force.
It achieves high heat transfer efficiency and pressure drop balance, making it suitable for scenarios with high heat transfer requirements and high resistance pressure drop limitations.
Smart Images
Figure CN224262326U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of plate heat exchangers, and in particular to a heat exchange plate and the heat exchanger thereof. Background Technology
[0002] Brazed plate heat exchangers are high-efficiency heat exchange devices made by brazing multiple layers of heat exchange plates. Channels for fluid flow are formed between adjacent plates, allowing different fluid media on either side of the heat exchange plate to exchange heat. Due to their high heat transfer efficiency, compact structure, and high pressure resistance, brazed plate heat exchangers are widely used in heat pump air conditioning and other fields.
[0003] In existing technologies, heat exchange plates with dimple-shaped concave and convex surfaces form staggered flow channels due to the different distributions of the dimples, which can enhance turbulence. However, existing dimple-shaped heat exchange plates are generally symmetrical or have low symmetry, resulting in unsatisfactory heat transfer and resistance performance, making them particularly unsuitable for applications requiring low flow resistance and high heat transfer. Therefore, there is still room for improvement in the heat transfer and resistance performance of dimple heat exchangers in existing technologies. Summary of the Invention
[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a heat exchange plate and its heat exchanger, which features high heat transfer and balanced pressure drop.
[0005] The objective of this utility model can be achieved through the following technical solutions:
[0006] A heat exchange plate includes a plate body, the plate body having a heat exchange unit, the heat exchange unit including a plurality of first wave points arranged in an array and a plurality of second wave points arranged in an array, the first wave points and the second wave points having opposite convex directions; the first wave points have two or four concave arc surfaces, the concave arc surfaces being distributed on both sides of the first wave points; each concave arc surface corresponds to a second wave point, and each concave arc surface is adjacent to a side plane portion on both sides; the ratio of the top surface area of the first wave point (3) to the top surface area of the second wave point (4) is greater than 3, and the volume of the first wave point is greater than that of the second wave point; wherein, a first flow channel is formed between adjacent first wave points, the first flow channel including a first flow cavity between two adjacent side plane portions and a second flow cavity between adjacent concave arc surfaces, the first flow cavity and the second flow cavity being connected, the volume of the second flow cavity being greater than that of the first flow cavity, and a second flow channel is formed between adjacent second wave points.
[0007] In the aforementioned heat exchange plate, the side plane portion and the plate body define the boundary of the first flow cavity.
[0008] In the heat exchange plate described above, the concave arc surface and the first wave point define the boundary of the second flow cavity.
[0009] In the heat exchange plate described above, the two ends of the first wave point have corresponding second wave points.
[0010] In the heat exchange plate described above, when there are two concave arc surfaces, the two sides of the first wave point have an axisymmetric structure, wherein one side of the first wave point includes a concave arc surface and two side planes.
[0011] In the heat exchange plate described above, when there are four concave arc surfaces, the two sides of the first wave point have a centrally symmetrical structure. Specifically, each side of the first wave point includes two concave arc surfaces and four side planes arranged alternately.
[0012] In the heat exchange plate described above, the concave arc surface is arranged around the second wave dot structure.
[0013] In the heat exchange plate described above, the crest size of the top plane of the second wave point is φ0.8-2.0 mm.
[0014] In the heat exchange plate described above, the thickness of the plate is 0.2-0.5 mm.
[0015] In the above-mentioned heat exchange plate, the heat exchange plate is integrally stamped.
[0016] In the heat exchange plate described above, the asymmetry between the first flow channel and the second flow channel is greater than 0.3.
[0017] A heat exchanger comprising the aforementioned heat exchange plate.
[0018] Compared with the prior art, this application has the following advantages:
[0019] The fluid in the first flow channel flows through the first and second flow chambers, forcing the fluid to generate secondary flows and local vortices. Several arrays of first and second wave points form a regularly staggered flow path, with flow occurring in multiple directions different from the mainstream fluid direction, thereby improving heat transfer efficiency. Because the fluid flows from the first flow chamber to the second flow chamber and then into the next first flow chamber, the cross-sectional area continuously expands and contracts, easily forming a velocity gradient, which is beneficial for inducing longitudinal vortices and accelerating fluid mixing. The fluid velocity continuously changes between the first and second flow chambers; in the high-velocity region, the liquid film can be peeled off through high shear force, thinning the boundary layer. Attached Figure Description
[0020] Figure 1 This is a structural diagram of the first embodiment in this application;
[0021] Figure 2 yes Figure 1 A magnified view of a portion of the image;
[0022] Figure 3 This is a perspective structural diagram of the first embodiment in this application;
[0023] Figure 4 This is a three-dimensional structural diagram of the first embodiment assembled in this application;
[0024] Figure 5 This is a structural diagram of the second embodiment in this application;
[0025] Figure 6 yes Figure 5 A magnified view of a portion of the image;
[0026] Figure 7 This is a perspective structural diagram of the second embodiment in this application;
[0027] Figure 8 This is a three-dimensional structural diagram of the assembled second embodiment in this application;
[0028] Figure 9 This is the three-dimensional structure of the heat exchanger in this application;
[0029] In the picture,
[0030] 2. Plate body; 21. First flow channel; 211. First flow cavity; 212. Second flow cavity; 22. Second flow channel;
[0031] 3. First wave point; 31. Concave arc surface; 32. Side plane;
[0032] 4. The second wave point. Detailed Implementation
[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0034] like Figures 1-8As shown, a heat exchange plate includes a plate body 2, the plate body 2 having a heat exchange unit, the heat exchange unit including a plurality of first wave points 3 arranged in an array and a plurality of second wave points 4 arranged in an array, the protrusion directions of the first wave points 3 and the second wave points 4 being opposite; the first wave point 3 has two or four concave arc surfaces 31, the concave arc surfaces 31 being distributed on both sides of the first wave point 3; each concave arc surface 31 corresponds to a second wave point 4, and the two sides of each concave arc surface 31 are adjacent to side planes 32; the ratio of the top surface area of the first wave point (3) to the top surface area of the second wave point (4) is greater than 3, and the volume of the first wave point 3 is greater than that of the second wave point 4; wherein, a first flow channel 21 is formed between adjacent first wave points 3, and a second flow channel 22 is formed between adjacent second wave points 4, the first flow channel 21 includes a first flow cavity 211 corresponding to the two adjacent side planes 32 and a second flow cavity 212 corresponding to the two adjacent concave arc surfaces 31, the first flow cavity 211 and the second flow cavity 212 are connected, and the volume of the second flow cavity 212 is greater than that of the first flow cavity 211.
[0035] In this application, the side of the first wave point 3 protruding in the direction of the main side is the main side, and the side of the second wave point 4 protruding in the direction of the auxiliary side is the auxiliary side. The medium on the main side is usually a refrigerant, and the medium on the auxiliary side is usually a heat transfer fluid.
[0036] The fluid within the first flow channel 21 flows through the first flow cavity 211 and the second flow cavity 212, forcing the fluid to generate secondary flow and local vortices. Several arrayed first wave points 3 and several arrayed second wave points 4 form a regularly staggered flow channel, with flow occurring in multiple directions different from the mainstream fluid direction, thereby improving heat transfer efficiency. As the fluid flows from the first flow cavity 211 to the second flow cavity 212 and then into the next first flow cavity, the cross-sectional area continuously expands and contracts, easily forming a velocity gradient, which is beneficial for inducing longitudinal vortices and accelerating fluid mixing. The fluid velocity continuously changes between the first and second flow cavities, and the high-velocity region can peel away the liquid film through high shear force, thinning the boundary layer. Therefore, the heat exchanger composed of heat exchange plates has the characteristics of high heat transfer and pressure drop balance, making it particularly suitable for scenarios with high heat transfer requirements and high resistance pressure drop limitations.
[0037] Furthermore, the top plane of the first wave point 3 and the top plane of the second wave point 4 are the locations for brazing connections.
[0038] Specifically, the side plane 32 and the plate 2 define the boundary of the first flow cavity 211.
[0039] Specifically, the concave arc surface 31 and the first wave point 3 define the boundary of the second flow cavity 212.
[0040] In practical use, it is necessary to braze the two heat exchange plates together symmetrically to form a heat exchange plate bundle. The first wave point 3 or the second wave point 4 of the two heat exchange plates are brazed together. The specific details are not described in detail here, as this is existing technology.
[0041] After the first wave point 3 is brazed, a complete main side channel is formed, that is, the first flow channels 21 on the two heat exchange plates are combined to form a main side channel. After the second wave point 4 is brazed, a complete auxiliary side channel is formed, that is, the second flow channels 22 on the two heat exchange plates are combined to form an auxiliary side channel.
[0042] Specifically, such as Figures 1-8 As shown, the first wave point 3 has corresponding second wave points 4 at both ends.
[0043] Specifically, such as Figures 1-4 As shown, when there are two concave arc surfaces 31, the two sides of the first wave point 3 are axisymmetric structures, wherein one side of the first wave point 3 includes a concave arc surface 31 and two side planes 32.
[0044] In this embodiment, the first wave point 3 is in an axisymmetric structural state. The first wave point 3 has four side planes 32 and two concave arc surfaces 31. The four side planes 32 are respectively connected to the two concave arc surfaces 31, and they converge in pairs to form a pointed structure. The structure gradually expands towards both ends along the central axis of the two concave arc surfaces 31, and then gradually converges after expanding to a preset size. Specifically, as follows... Figure 1-4 As shown.
[0045] Each second flow cavity 212 is connected to four first flow cavities 211.
[0046] Specifically, such as Figures 5-8 As shown, when there are four concave arc surfaces 31, the two sides of the first wave point 3 are centrally symmetrical structures. The first wave point 3 has two concave arc surfaces 31 and four side planes 32 arranged alternately on one side.
[0047] In this embodiment, an improvement is made based on the previous embodiment, by connecting two adjacent first wave points 3 together, thereby reducing the number of first flow cavities 211.
[0048] In this case, two situations arise: one part of the second flow cavity 212 connects to two first flow cavities 211, and the other part of the second flow cavity 212 connects to four first flow cavities 211 simultaneously.
[0049] Specifically, such as Figures 1-8 As shown, the concave arc surface 31 is set around the second wave point 4.
[0050] Specifically, the crest size of the top plane of the second wave point 4 is φ0.8-2.0 mm.
[0051] Specifically, the thickness of the plate is 0.2-0.5mm.
[0052] Specifically, the heat exchange plate is formed by one-piece stamping.
[0053] Specifically, the asymmetry between the first flow channel 21 and the second flow channel 22 is greater than 0.3. Asymmetry = Volume of the second flow channel / Volume of the first flow channel - 1.
[0054] like Figure 9 As shown, a heat exchanger includes the aforementioned heat exchange plate.
[0055] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture, as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.
[0056] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Meanwhile, the word "and / or" throughout the text means including three solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0057] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.
[0058] The specific embodiments described herein are merely illustrative examples of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from this utility model or exceeding the scope defined by the appended claims.
Claims
1. A heat exchange plate, characterized in that, The plate (2) includes a heat exchange unit, which includes an array of first wave points (3) and an array of second wave points (4). The first wave points (3) and the second wave points (4) have opposite convex directions. The first wave points (3) have two or four concave arc surfaces (31), which are distributed on both sides of the first wave points (3). Each concave arc surface (31) corresponds to a second wave point (4), and each concave arc surface (31) is adjacent to a side plane (32). The top surface area of the first wave point (3) is equal to that of the second wave point (4). 4) The ratio of the top surface area is greater than 3, and the volume of the first wave point (3) is greater than that of the second wave point (4); wherein, a first flow channel (21) is formed between adjacent first wave points (3), and a second flow channel (22) is formed between adjacent second wave points (4). The first flow channel (21) includes a first flow cavity (211) between two adjacent side planes (32) and a second flow cavity (212) between adjacent concave arc surfaces (31). The first flow cavity (211) and the second flow cavity (212) are connected, and the volume of the second flow cavity (212) is greater than that of the first flow cavity (211).
2. The heat exchange plate according to claim 1, characterized in that, The first wave point (3) has corresponding second wave points (4) at both ends.
3. The heat exchange plate according to claim 1, characterized in that, When there are two concave arc surfaces (31), the two sides of the first wave point (3) are axially symmetric structures, wherein one side of the first wave point (3) includes a concave arc surface (31) and two side planes (32).
4. The heat exchange plate according to claim 1, characterized in that, When there are four concave arc surfaces (31), the two sides of the first wave point (3) are centrally symmetrical structures, wherein one side of the first wave point (3) includes two concave arc surfaces (31) and four side planes (32) arranged alternately in sequence.
5. The heat exchange plate according to claim 3 or 4, characterized in that, The concave arc surface (31) is set around the second wave point (4).
6. The heat exchange plate according to claim 1, characterized in that, The crest size of the top plane of the second wave point (4) is φ0.8-2.0 mm.
7. The heat exchange plate according to claim 1, characterized in that, The thickness of the plate is 0.2-0.5 mm.
8. The heat exchange plate according to claim 1, characterized in that, The heat exchange plate is integrally stamped.
9. The heat exchange plate according to claim 1, characterized in that, The asymmetry between the first flow channel (21) and the second flow channel (22) is greater than 0.
3.
10. A heat exchanger, characterized in that, Includes the heat exchange plate according to any one of claims 1-9.