Liquid cooling plate with flow guide structure and preparation method thereof

Abstract

The application belongs to the technical field of liquid cooling heat dissipation, and particularly relates to a liquid cooling plate with a flow guide structure and a preparation method thereof. The liquid cooling plate comprises an upper shell plate and a lower shell plate, the upper shell plate and the lower shell plate are connected to each other to form a flow channel for a cooling fluid, and at least one side of a side wall surface of the flow channel is provided with a plurality of first flow guide structures integrally formed by a wall surface material. The first flow guide structure has a flow guide surface pointing to a heat exchange surface, so that the cooling fluid is guided by the first flow guide structure when flowing in the flow channel, and a deflection and impact effect is generated to effectively destroy a thermal boundary layer near the wall surface and significantly improve the efficiency of convective heat exchange. The top wall surface and / or the bottom wall surface of the flow channel can also be provided with second flow guide structures to form a multi-azimuth three-dimensional flow guide flushing area with the first flow guide structures, and the heat exchange effect is further improved. The application has stable structure, simple process, and can effectively improve the heat dissipation conditions and temperature uniformity of the heat source surface.

Description

Technical Field

[0001] This invention belongs to the field of liquid cooling technology, specifically relating to a liquid cooling plate with a flow guiding structure and its preparation method. Background Technology

[0002] Liquid cooling technology has been widely used in the thermal management of various high heat flux density heat sources due to its advantages such as high heat dissipation efficiency, compact structure, and ease of integration. Existing liquid cooling plates typically include an upper shell plate, a lower shell plate, and a closed flow channel formed between them for the flow of cooling fluid. The heat source is in contact with one side surface of the liquid cooling plate, and the cooling fluid carries away the heat as it flows within the flow channel.

[0003] However, the internal flow channels of existing liquid cooling plates are mostly straight channels or only have simple turbulence protrusions. During flow, a stable thermal boundary layer easily forms near the wall. As the flow distance increases, the boundary layer thickens, and the convective heat transfer capacity near the wall gradually weakens, limiting further improvement in the overall heat transfer performance of the liquid cooling plate. When the flow channel height is small, wall constraint intensifies, the flow tends towards laminar flow, and the heat exchange efficiency between the wall and the fluid center further decreases. Furthermore, some existing turbulence structures only act near one side of the wall, limiting the flow field's influence and making it difficult to create synergistic guiding and impact effects in multiple directions of the flow channel cross-section. Simultaneously, if the height and arrangement of the turbulence structure are unreasonable, it can easily lead to excessive reduction of the local cross-section of the flow channel and a sharp increase in flow resistance, affecting the operational reliability of the liquid cooling plate. In addition, existing turbulence structures are mostly independent components that need to be fixed to the flow channel wall by welding or bonding, which not only increases assembly processes and manufacturing costs but also poses risks of contact thermal resistance at the connection interface and long-term detachment.

[0004] Therefore, how to effectively disrupt the thermal boundary layer near the wall and enhance near-wall fluid renewal under the condition of limited flow channel space, while avoiding excessive increase in flow resistance and simplifying manufacturing process and assembly difficulty, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] Based on this, the present invention provides a liquid cooling plate with a flow guiding structure and its preparation method. The present invention utilizes a flow guiding structure integrally formed on the flow channel wall to deflect and impact the cooling fluid during flow, effectively disrupting the thermal boundary layer on the wall, enhancing convective heat transfer, and significantly improving the heat dissipation capacity of the liquid cooling plate and the uniformity of the heat source surface temperature.

[0006] To achieve the above objectives, the present invention includes the following technical solutions: A liquid cooling plate with a flow guiding structure includes an upper shell plate and a lower shell plate. The upper shell plate and the lower shell plate are connected to each other to form a flow channel for cooling fluid to flow. The side of the upper shell plate or the lower shell plate that is in contact with a heat source is a heat exchange side, and the inner surface of the heat exchange side facing the flow channel is a heat exchange surface. At least one side of the sidewall of the flow channel is provided with a plurality of first flow guiding structures integrally formed by the wall material. The first flow guiding structure includes a root connected to the wall surface and an outwardly extending extension. The extension has a flow guiding surface facing the side of the cooling fluid flow. The first flow guiding structure extends from the sidewall surface in a downstream direction of the cooling fluid. The flow guiding surface forms a first included angle α with the sidewall surface. The connection between the flow guiding surface and the sidewall surface forms a first rotation angle β with a first vertical plane, such that the flow guiding surface points to the opposite wall surface of the heat exchange surface. The first vertical plane is a plane that is perpendicular to both the sidewall surface and the flow direction of the cooling liquid.

[0007] The first flow-guiding structure is located on the sidewall of the flow channel, with the guiding surface pointing towards the opposite wall of the heat exchange surface. This causes the cooling fluid flowing along the sidewall to deflect under the guidance of the guiding surface, forming a reflected flow that redirects from the sidewall direction to impact the heat exchange surface in contact with the heat source. Multiple flow-guiding structures on the sidewall cause the cooling fluid to undergo multiple deflections and impacts, continuously disrupting the near-wall thermal boundary layer and significantly improving the convective heat transfer coefficient. The sidewall of the flow channel can be arranged on one side or both sides depending on the actual heat source layout. A single-side arrangement is suitable for operating conditions where the heat source is biased to one side or is sensitive to pressure drop, while a double-side arrangement is suitable for operating conditions requiring double-sided counter-impact to enhance disturbance. When both sides are simultaneously arranged, the fluid is guided from both sides of the flow channel to impact the middle of the heat exchange surface, forming a converging impact that further enhances local heat transfer and flexibly adapts to different heat dissipation requirements. The first flow-guiding structure is integrally formed from the wall material, using the same material and as a single unit, avoiding the risk of the flow-guiding structure detaching due to welding or assembly failures, and ensuring the structural reliability for long-term operation. Compared to setting an independent flow-disrupting element or sintering a porous structure in the flow channel, the first flow-guiding structure of this application only needs to be formed in one process on the side wall surface, without the need for additional processes such as welding, sintering or assembly. The process is simplified, production efficiency is improved, and the impact on the flow channel sealing is avoided, thus ensuring the yield rate.

[0008] Furthermore, the height of the highest and lowest points of the first flow guide structure in the vertical direction is less than 70% of the lowest height of the flow channel. This height range ensures that the flow guide structure can effectively guide and deflect the cooling fluid without significantly increasing the pressure drop, avoiding the excessive reduction of the local cross-sectional area of ​​the flow channel, which would lead to a sharp increase in flow resistance. This allows the internal environment of the flow channel to maintain smooth flow while possessing good impact heat transfer capability, which is beneficial for the liquid cooling plate to achieve efficient thermal management while taking into account both pump power consumption and heat transfer performance.

[0009] Furthermore, the first included angle α is greater than 0° and less than 90°; the first rotation angle β is greater than 0° and less than 90°. The first included angle and the first rotation angle together determine the exit direction of the cooling fluid when it leaves the guide surface. When both the first included angle and the first rotation angle are greater than 0° and less than 90°, the guide structure can effectively intercept and deflect the main flow in the flow channel, allowing the cooling fluid to obtain sufficient velocity components to impact the heat exchange surface. At the same time, it can avoid flow separation and local pressure drop caused by excessive interception or deflection by the guide surface. The two work together to achieve a balance between the heat transfer enhancement effect and the increase in flow resistance.

[0010] Furthermore, the upper shell plate includes an upper shell plate body and multiple ribs connected to the inner surface of the upper shell plate. The lower shell plate is in the shape of an open box, with the upper shell plate body covering the opening of the lower shell plate. The ribs contact the inner bottom surface of the lower shell plate, and the gaps between adjacent ribs, together with the inner surfaces of the upper and lower shell plates, form flow channels. The first flow guiding structure is disposed on the side surface of the ribs. As a protruding structure on the inner surface of the upper shell plate, the ribs not only form flow channels between adjacent ribs but also act as support columns between the upper and lower shell plates, significantly improving the overall compressive strength of the liquid cooling plate in the thickness direction.

[0011] Furthermore, the lower shell plate has a recessed surface on one side facing the upper shell plate to form a channel, and the upper shell plate covers the channel to form a flow channel.

[0012] Furthermore, at least one of the top and bottom walls of the flow channel is provided with a second flow-guiding structure at intervals. The second flow-guiding structures, spaced apart on the top and / or bottom walls, complement the first flow-guiding structure spatially, forming a multi-directional, three-dimensional flow-guiding and scouring zone. This ensures that the cooling fluid is guided and disturbed in all directions of the flow channel cross-section. Simultaneously, the second flow-guiding structures, arranged at intervals, create intermittent flow-guiding and impact zones along the flow path, maintaining good flow capacity within the flow channel while providing sufficient disturbance and impact heat transfer effects.

[0013] Furthermore, the second flow-guiding structure has a frontal surface and a backal surface facing the incoming cooling fluid. The intersection of the backal surface of the second flow-guiding structure and the second vertical surface forms a second angle with the top / bottom wall surface. The second angle σ is greater than 3° and less than 90°, wherein the second vertical surface is a vertical surface parallel to the direction of cooling fluid flow. When the angle is small, the flow-guiding structure provides less resistance to the cooling fluid flow, making it suitable for inlet sections or areas sensitive to pressure drop. When the angle is large, the flow-guiding structure enhances its interception and redirection effects on the incoming cooling fluid, generating stronger backflow disturbance and boundary layer disruption effects, making it suitable for high heat flux density areas or local hot spots.

[0014] Furthermore, the shape of the second flow guiding structure is selected from one or more of the following: boat-shaped, barbed, or semi-conical shell. The boat-shaped flow guiding structure has a smooth transition in shape and low flow resistance, making it suitable for areas that require reduced pressure drop and smooth flow guidance; the barbed flow guiding structure has a sharp backflow surface, which can effectively disrupt the wall boundary layer and generate backflow disturbances, making it suitable for areas that require increased fluid mixing intensity and enhanced heat transfer; the semi-conical shell flow guiding structure has a simple structure and clear guidance, making it suitable for areas with limited space or where localized directional impacts are required.

[0015] Furthermore, the length of the second flow guiding structure along the liquid flow direction is 5% to 50% of the channel width and not less than 0.05 mm, and its height protruding from the wall is 0.05 mm to 2 mm.

[0016] Furthermore, a method for preparing the liquid-cooled plate as described above includes the following steps: S1: Provide flat sheet metal for forming the upper and lower shell plates, cut to the required rectangular size; S2: The lower shell plate is processed to form a cavity or channel structure for containing cooling fluid; the cavity or channel structure is used to enclose the upper shell plate to form a flow channel; S3: Process the upper shell plate to form a rib structure or planar structure on its inner surface; S4: A flow guiding structure is formed on the inner wall of the flow channel between the upper shell plate and the lower shell plate by processing. The flow guiding structure is integrally formed from a local material of the inner wall surface. S5: Align and fit the upper shell plate and the lower shell plate together, and seal them together as one unit by one of the following connection methods: laser welding, diffusion welding, or high-temperature brazing.

[0017] Beneficial Effects: This invention, by integrally forming a flow-guiding structure on the flow channel wall, causes the cooling fluid to deflect and impact during flow, effectively disrupting the wall's thermal boundary layer, enhancing convective heat transfer, and significantly improving the heat dissipation capacity of the liquid cooling plate and the temperature uniformity of the heat source surface. The flow-guiding structure can be disposed on the side wall, top wall, or bottom wall, forming single-sided or multi-sided flow-guiding and scouring areas. In one embodiment, the flow-guiding structure is disposed on the side surface of the ribs, with the gaps between the ribs naturally forming flow channels, simultaneously enhancing the compressive strength of the liquid cooling plate. In another embodiment, the flow-guiding structure is disposed on the wall of the recessed channel in the lower shell plate, facilitating flexible design and processing of the flow channel direction. All embodiments achieve enhanced heat transfer without significantly increasing flow resistance and possess advantages such as structural stability, simple process, and ease of mass production. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the liquid cooling plate in Example 1.

[0019] Figure 2 This is a schematic diagram of the transverse cross-sectional structure of the liquid cooling plate of Example 1, taken perpendicular to the direction of cooling fluid flow.

[0020] Figure 3 This is a schematic diagram of the upper shell structure of the liquid cooling plate in Example 1.

[0021] Figure 4 This is a schematic diagram of the rib column structure in Example 1.

[0022] Figure 5 This is a top view of the flow channel of the liquid cooling plate in Example 1.

[0023] Figure 6 This is a side view of the upper shell of the liquid cooling plate in Example 1.

[0024] Figure 7 The diagram shows different arrangements of the first flow guiding structure in Example 1. Among them, 7-a is a symmetrical distribution of the first flow guiding structure of the same size on both sides, 7-b is a staggered distribution of the first flow guiding structure of the same size on both sides, 7-c is a unilateral distribution of the first flow guiding structure of different sizes on one side, 7-d is a symmetrical distribution of the first flow guiding structure of different sizes on both sides, and 7-e is a staggered distribution of the first flow guiding structure of different sizes on both sides.

[0025] Figure 8 This is a schematic diagram of the overall structure of the liquid cooling plate in Example 2.

[0026] Figure 9 This is a schematic diagram of the transverse cross-sectional structure of the liquid cooling plate of Example 2, taken perpendicular to the direction of cooling fluid flow.

[0027] Figure 10 This is a schematic diagram of the lower shell channel structure of the liquid cooling plate in Example 2.

[0028] Figure 11 This is a top view of the lower shell of the liquid cooling plate in Example 2.

[0029] Figure 12 This is a schematic diagram of the top wall surface of the liquid cooling plate in Example 2.

[0030] Figure 13 This is a schematic diagram showing the angle between the backflow surface of the second flow guiding structure and the wall surface it is located in Example 2.

[0031] Figure 14 This is a schematic diagram of the shape of the second flow guiding structure in Example 2. 12-a is a boat-shaped flow guiding structure, 12-b is a barbed flow guiding structure, and 12-c is a semi-conical shell flow guiding structure.

[0032] In the figure: 1-1, upper shell plate; 1-2, lower shell plate; 1-3, flow channel; 2, first flow guiding structure; 2-1, root; 2-2, flow guiding part; 2-3, flow guiding surface; 3, rib; 4, channel; 4-1, side wall surface; 4-2, bottom wall surface; 4-3, top wall surface; 5, second flow guiding structure; 5-1, frontal surface; 5-2, backal surface. Detailed Implementation

[0033] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0034] In the description of the embodiments in this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] The terms "first," "second," "third," "fourth," etc., as used in this application (if applicable), are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The sequence numbers of the processes below do not imply a specific order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0036] References to “some embodiments” and the like in this specification mean that one or more embodiments of this application include a particular feature, structure, or characteristic described in connection with that embodiment. Therefore, phrases such as “some embodiments” appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean “one or more, but not all, embodiments”, unless otherwise specifically emphasized. The terms “comprising,” “including,” “having,” and variations thereof mean “including, but not limited to,” unless otherwise specifically emphasized.

[0037] Unless otherwise defined, the technical terms or scientific data used in this application shall have the ordinary meaning as understood by a person with ordinary skill in the art to which this application pertains.

[0038] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0039] It should also be understood that the various implementation methods described in this specification can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0040] In this embodiment, the same reference numeral denotes the same component or part. In this embodiment, for multiple identical parts, the reference numeral may only be used to label one of the parts as an example. The reference numerals also apply to other identical parts or components. Furthermore, the dimensions and sizes of the parts shown in the drawings are merely exemplary.

[0041] Example 1 like Figures 1-3 As shown, this embodiment provides a liquid cooling plate with a flow guiding structure, including an upper shell plate 1-1 and a lower shell plate 1-2. The upper shell plate 1-1 and the lower shell plate 1-2 are connected to each other to form a flow channel 1-3 for the flow of cooling fluid.

[0042] The upper shell plate 1-1 includes an upper shell body and multiple ribs 3 connected to the inner surface of the upper shell. The ribs 3 are arranged at intervals along the upper shell plate 1-1. The lower shell plate 1-2 is an open box shape, with the upper shell body covering the opening of the lower shell plate. The gap between two adjacent ribs 3, together with the inner surfaces of the upper shell plate 1-1 and the lower shell plate 1-2, encloses a flow channel 1-3. The ribs 3 extend from the inner surface of the upper shell plate 1-1 towards the lower shell plate 1-2, with their top ends contacting the inner bottom surface of the lower shell plate 1-2, thereby forming a support structure in the thickness direction of the flow channel 1-3. This significantly improves the overall compressive strength of the liquid cooling plate in the thickness direction and prevents the flow channel 1-3 from deforming under pressure.

[0043] Multiple first flow guiding structures 2 are provided on the side wall surface of the flow channel 1-3. In this embodiment, the first flow guiding structures 2 are disposed on the side surface of the rib 3, that is, on both sides of the flow channel 1-3 in the width direction. The first flow guiding structures 2 are integrally formed from the wall material of the side surface of the rib 3.

[0044] like Figure 4 As shown, the first flow guiding structure 2 includes a root portion 2-1 connected to the side surface of the rib 3 and an outwardly extending extension portion 2-2, the extension portion 2-2 having a flow guiding surface 2-3 facing the side of the cooling fluid flow.

[0045] In this embodiment, multiple first flow guiding structures 2 are spaced apart along the extension direction of the flow channel 1-3. The spacing between two adjacent first flow guiding structures 2 can be adjusted according to the heat dissipation requirements at different locations of the flow channel 1-3. In areas where heat exchange needs to be enhanced, the spacing between the flow guiding structures is appropriately reduced to increase the disturbance frequency; in the inlet section or pressure drop sensitive area, the spacing is appropriately increased to reduce flow resistance.

[0046] like Figures 5-6 As shown, the first flow guiding structure 2 extends from the side surface of the rib 3 towards the downstream direction of the cooling fluid. The tangential plane at the location of the root 2-1 of the first flow guiding structure on the side wall of the rib 3 forms a first angle α with the flow guiding surface 2-3. The connection between the flow guiding surface 2-3 and the rib forms a first rotation angle β with the first vertical plane, such that the flow guiding surface 2-3 points to the opposite wall of the heat exchange surface (in this embodiment, the upper shell plate that is attached to the heat source is taken as the heat exchange surface). The first vertical plane is a plane that is perpendicular to both the tangential plane at the location of the root 2-1 and the flow direction of the cooling liquid.

[0047] In this embodiment, the first included angle α is preferably 0° < α < 90°, and the first rotation angle β is preferably 0° < β < 90°. The height between the highest and lowest points of the first flow guiding structure 2 in the vertical direction is less than 70% of the lowest height of the flow channel 1-3, to ensure that there is enough space inside the flow channel 1-3 for the cooling fluid to pass through, and to avoid excessive reduction of the local cross-section and a sharp increase in flow resistance due to the excessive height of the flow guiding structure.

[0048] When the cooling fluid flows within flow channels 1-3, a boundary layer with a large velocity gradient is formed near the sidewall due to the wall viscosity. Within this boundary layer, the fluid primarily undergoes heat conduction, with weak convective heat transfer. When the cooling fluid encounters the first guide structure 2 located on the side surface of the rib 3, the guide surface 2-3 forcibly deflects the incoming flow, forming a reflected flow that causes the fluid to obliquely impact the heat exchange surface. After the impact, the fluid diffuses outwards along the heat exchange surface, carrying away the high-temperature fluid near the heat exchange surface and simultaneously disrupting the thermal boundary layer near the heat exchange surface. Subsequently, the fluid continues to flow downstream under the propulsion of the main flow, entering the effective range of the next first guide structure 2. The cooling fluid undergoes deflection and impact once each time it passes through a first guide structure 2. Multiple first guide structures 2 are arranged at intervals along the extension direction of flow channels 1-3, allowing the cooling fluid to sequentially experience multiple cycles of deflection and impact along the flow path, thereby creating a continuous multi-stage enhanced heat transfer effect throughout the entire flow channel 1-3.

[0049] Meanwhile, since the first flow guiding structure 2 is integrally formed from the wall material of the side surface of the rib column 3, contact thermal resistance and the risk of falling off are avoided, ensuring the structural reliability for long-term use.

[0050] like Figure 7As shown, the first flow guiding structure 2 can be arranged in different ways on the side surface of the rib 3, and the first flow guiding structure 2 on the same rib can have different sizes. Specifically, 7-a shows a symmetrical distribution of the same size first flow guiding structure on both sides; 7-b shows a staggered distribution of the same size first flow guiding structure on both sides; 7-c shows a single-sided distribution of different sizes first flow guiding structures; 7-d shows a symmetrical distribution of different sizes first flow guiding structures on both sides; and 7-e shows a staggered distribution of different sizes first flow guiding structures on both sides. Preferably, a staggered distribution is used in high heat flux density regions to enhance fluid mixing intensity and heat transfer effect; a symmetrical and uniform distribution is used in the inlet section or pressure drop sensitive region to obtain more uniform flow resistance and heat transfer effect.

[0051] In this embodiment, the spacing between two adjacent first flow guiding structures 2 is preferably not less than 5 mm. Optionally, the spacing between adjacent flow guiding structures increases or decreases along the flow direction of the cooling fluid to adapt to the heat dissipation requirements at different locations in the flow channel.

[0052] The liquid cooling plate with a flow guiding structure provided in this embodiment is prepared by the following steps: S1: Provide a flat plate for forming the upper shell plate 1-1 and the lower shell plate 1-2. The plate material is any one of aluminum, copper or stainless steel. Cut the flat plate into rectangular plates of the required shape and size according to the design dimensions of the liquid cooling plate. The cutting method can be any one of laser cutting, wire cutting or mechanical punching to ensure that the plate edges are flat and the dimensions are consistent. S2: Take the cut lower shell plate and process its surface. In this embodiment, the lower shell plate 1-2 is in the shape of an open box; optionally, the inner surface of the lower shell plate 1-2 can be ground or trimmed as necessary to remove processing burrs and ensure surface flatness; S3: Take the cut upper shell plate and process multiple ribs 3 on its inner surface by milling, die casting or scraping. During processing, mark the position of the ribs 3 on the plate according to the design drawings, and remove the excess material between the ribs 3 by milling to form a gap between adjacent ribs 3 to accommodate the cooling fluid. The shape, size and arrangement of each rib 3 must match the corresponding position of the lower shell plate 1-2 to ensure that the ribs 3 can abut against or maintain the set gap with the inner surface of the lower shell plate 1-2 during subsequent assembly. S4: After the rib 3 is processed, a local material is cut and turned up on the side surface of the rib 3 by plowing, punching or laser processing to form the first flow guiding structure 2; the edges of the rib 3 and the first flow guiding structure 2 of the upper shell plate 1-1 are trimmed and deburred as necessary to ensure the fitting accuracy and connection reliability during subsequent bonding.

[0053] S5: Align and bond the upper shell plate 1-1 and the lower shell plate 1-2 according to the preset position, so that the ribs 3 of the upper shell plate 1-1 abut against the inner surface of the lower shell plate 1-2. Seal and connect the bonded upper shell plate 1-1 and lower shell plate 1-2 into a whole by laser welding, diffusion welding or high temperature brazing to form a liquid cooling plate with internal flow channels 1-3, ribs 3 and first flow guiding structure 2.

[0054] Example 2 like Figures 8-10 As shown, this embodiment provides a liquid cooling plate with a flow guiding structure, including an upper shell plate 1-1 and a lower shell plate 1-2. The upper shell plate 1-1 and the lower shell plate 1-2 are connected to each other to form a flow channel 1-3 for the flow of cooling fluid.

[0055] A channel 4 is formed by a recess on the surface of the lower shell plate 1-2 facing the upper shell plate 1-1. The channel 4 is formed by a downward recess from the upper surface of the lower shell plate 1-2, creating a groove structure for accommodating cooling fluid. The upper shell plate 1-1 covers the lower shell plate 1-2 and closes the opening of the channel 4, thus forming a flow channel 1-3 together with the channel 4. One end of the channel 4 has an inlet for cooling fluid to enter, and the other end has an outlet for cooling fluid to flow out. The inlet and outlet are respectively connected to an external cooling fluid circulation system.

[0056] like Figure 11 As shown, multiple first flow guiding structures 2 are provided on the sidewalls of the flow channel 1-3. In this embodiment, the first flow guiding structure 2 is structurally the same as the first flow guiding structure 2 in embodiment 1, except that the first flow guiding structure 2 in this embodiment is disposed on the sidewall 4-1 of the channel 4, that is, on both sides of the width direction of the flow channel 1-3. The first flow guiding structure 2 is integrally formed from the wall material of the sidewall 4-1 of the channel 4.

[0057] like Figure 11 and Figure 12 As shown, the top and / or bottom walls of the flow channel 1-3 are also provided with a plurality of second flow guiding structures 5. In this embodiment, the second flow guiding structures 5 are disposed on the bottom wall 4-2 (i.e., the inner surface of the lower shell plate 1-2) and / or the top wall 4-3 (i.e., the inner surface of the upper shell plate 1-1) of the channel 4.

[0058] The second flow guiding structure 5 is integrally formed from the wall material of the bottom wall surface 4-2 or the top wall surface 4-3 of the channel 4. For example... Figure 13As shown, the second flow guiding structure 5 has a frontal surface 5-1 facing the incoming cooling fluid and a backal surface 5-2. The frontal surface 5-1 faces the incoming direction of the cooling fluid and is used to receive the incoming flow and initially deflect the fluid. The backal surface 5-2 faces away from the incoming direction of the cooling fluid. The intersection of the backal surface 5-2 and the second vertical surface forms a second angle σ with the top / bottom wall surface. The second angle σ is preferably 3° < σ < 90°, where the second vertical surface is a vertical surface parallel to the flow direction of the cooling fluid. When the backal surface is a plane, the second angle is the angle between the backal surface and the bottom / top wall surface.

[0059] like Figure 14 As shown, the second flow guiding structure 5 can be boat-shaped, barbed, or conical, where 14-a is a boat-shaped flow guiding structure, 14-b is a barbed flow guiding structure, and 14-c is a semi-conical shell flow guiding structure. In this embodiment, the second flow guiding structure 5 is a semi-conical shell; in other embodiments, it can also be boat-shaped or barbed.

[0060] Multiple second flow guiding structures 5 are spaced apart along the extension direction of flow channels 1-3. The length of the second flow guiding structure 5 along the cooling fluid flow direction is not less than 0.05 mm, and the height protruding from its corresponding wall surface is 0.05 mm to 2 mm. The spacing between two adjacent second flow guiding structures 5 can be adjusted according to the heat dissipation requirements at different locations in the flow channel.

[0061] The second flow guiding structure 5 can be positioned correspondingly, staggeredly, or alternately with the first flow guiding structure 2 on the side wall 4-1, depending on whether it is positioned on the bottom wall 4-2 and / or the top wall 4-3. When positioned correspondingly, the second flow guiding structure 5 and the first flow guiding structure 2 are at the same transverse cross-sectional position on the opposite wall of the flow channel 1-3, allowing the cooling fluid to be simultaneously guided by the side wall, bottom wall, and / or top wall, enhancing the synergistic scouring effect on adjacent walls. When positioned staggered, the second flow guiding structure 5 is located between two adjacent first flow guiding structures 2, causing the cooling fluid to be deflected after flowing through the first flow guiding structure 2 and then guided by the second flow guiding structure 5, which is beneficial for forming a continuous, alternating, multi-stage flow guiding impact zone in the extension direction of the flow channel 1-3. When staggered, the second flow guiding structure 5 is spatially staggered with the first flow guiding structure 2 on the side wall 4-1 on the bottom wall 4-2 and / or top wall 4-3, so that the force direction of the cooling fluid on the flow channel cross section continues to change, forming a more complex flow field structure, improving the mixing intensity and heat exchange effect of the fluid.

[0062] When the cooling fluid flows along the length of the channel 1-3, it is deflected by the first guide structure 2 on the side wall 4-1, forming a reflected flow that impacts the heat exchange surface. At the same time, the incoming flow is received by the front surface 5-1 of the second guide structure 5 on the bottom wall 4-2 and / or the top wall 4-3, which deflects the fluid. This causes the cooling fluid to be subjected to alternating guide action from different directions within the channel cross-section, effectively breaking the thermal boundary layer near the wall and significantly improving the convective heat transfer coefficient.

[0063] In this embodiment, the cross-sectional shape of channel 4 can be designed into various forms such as rectangle, trapezoid, arc, or U-shape according to actual needs. The extension path of channel 4 can be any one or a combination of straight, curved, serpentine, ring, branching, or converging types to flexibly adapt to the shape, size, and heat flux density distribution of the heat source surface.

[0064] When the second flow guiding structure 5 is simultaneously disposed on both the bottom wall surface 4-2 and the top wall surface 4-3, the second flow guiding structures on the bottom and top walls can be arranged correspondingly or staggered. When arranged correspondingly, the second flow guiding structures 5 on the bottom and top walls are located at the same transverse cross-sectional position, so that the cooling fluid is simultaneously subjected to the guiding effect from the bottom and top walls in the direction of flow channel height, forming a synchronous impact on the heat exchange surface; when arranged staggered, the second flow guiding structures 5 on the bottom and top walls are alternately distributed in the direction of flow channel extension, so that the cooling fluid alternately impacts the bottom and top walls during the flow process, forming a periodic impact path, further enhancing the mixing and heat exchange effect of the fluid.

[0065] The liquid cooling plate with a flow guiding structure provided in this embodiment is prepared by the following steps: S1: Provide a flat plate for forming the upper shell plate 1-1 and the lower shell plate 1-2. The plate material is any one of aluminum, copper or stainless steel. Cut the flat plate into rectangular plates of the required shape and size according to the design dimensions of the liquid cooling plate. The cutting method can be any one of laser cutting, wire cutting or mechanical punching to ensure that the plate edges are flat and the dimensions are consistent. S2: Take the cut lower shell plate and process it by stamping, milling or chemical etching to form a recessed channel 4 on its upper surface. At the same time, process it to form an inlet for cooling fluid to enter and an outlet for cooling fluid to flow out. The cross-sectional shape of the channel 4 can be designed as rectangular, trapezoidal, arc or U-shaped according to actual needs. The extension path of the channel 4 can be any one or a combination of straight, curved, serpentine, ring, branch or confluence type. S3: Take the cut upper shell plate. In this embodiment, the upper shell plate 1-1 adopts a flat plate structure, and its surface facing the flow channel 1-3 is flat, requiring no additional structural processing. Optionally, the edges and inner surfaces of the upper shell plate 1-1 are ground or trimmed as necessary to remove processing burrs and ensure surface flatness.

[0066] S4: Using methods such as plowing, stamping, micromachining, or laser processing, a portion of the material is cut and raised on the side wall 4-1 of channel 4 to form a first flow guide structure 2 with a certain angle and height without detaching from the base material. If a second flow guide structure 5 needs to be set on the bottom wall 4-2 of channel 4, after channel 4 is formed, a portion of the material is cut and raised on the bottom wall 4-2 of channel 4 using methods such as plowing, stamping, micromachining, or laser processing to form the second flow guide structure 5. If a second flow guide structure 5 needs to be set on the top wall 4-3, the second flow guide structure 5 is formed on the top wall 4-3 using the same method as the bottom wall 4-2. The first flow guide structure 2 and the second flow guide structure 5 can be processed sequentially in the same process or in steps. The edges of channel 4, the first flow guide structure 2, and the second flow guide structure 5 of the lower shell plate 1-2 are trimmed and deburred as necessary to ensure the fitting accuracy and connection reliability during subsequent bonding. S5: Align and bond the upper shell plate 1-1 and the lower shell plate 1-2 according to the preset position, so that the inner surface of the upper shell plate 1-1 covers the opening of the channel 4 and the channel 4 is closed. Seal and connect the bonded upper shell plate 1-1 and the lower shell plate 1-2 into one piece by laser welding, diffusion welding or high temperature brazing to form a liquid cooling plate with internal flow channels 1-3, first flow guiding structure 2 and second flow guiding structure 5.

[0067] The above description is merely a preferred embodiment of the present invention and is only used to illustrate the technical solution of the present invention. It is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the scope of the present invention.

Claims

1. A liquid cooling plate with a flow guiding structure, characterized in that, The device includes an upper shell plate and a lower shell plate, which are connected to each other to form a flow channel for cooling fluid. The side of the upper shell plate or the lower shell plate that is in contact with the heat source is a heat exchange side, and the inner surface of the heat exchange side facing the flow channel is a heat exchange surface. At least one side of the sidewall of the flow channel is provided with a plurality of first flow guiding structures integrally formed from the wall material. The first flow guiding structure includes a root connected to the wall surface and an outwardly extending extension, the extension having a flow guiding surface facing the side from which the cooling fluid flows. The first flow guiding structure extends from the sidewall surface in the downstream direction of the cooling fluid, the flow guiding surface and the sidewall surface form a first included angle α, and the connection between the flow guiding surface and the sidewall surface forms a first rotation angle β with a first vertical plane, such that the flow guiding surface points to the opposite wall surface of the heat exchange surface, wherein the first vertical plane is a plane perpendicular to both the sidewall surface and the direction of cooling liquid flow.

2. The liquid cooling plate with a flow guiding structure according to claim 1, characterized in that, The height of the highest and lowest points of the first flow guide structure in the vertical direction is less than 70% of the lowest height of the flow channel.

3. The liquid cooling plate with a flow guiding structure according to claim 1, characterized in that, The first included angle α is greater than 0° and less than 90°; the first rotation angle β is greater than 0° and less than 90°.

4. The liquid cooling plate with a flow guiding structure according to claim 1, characterized in that, The upper shell plate includes an upper shell plate body and a plurality of ribs connected to the inner surface of the upper shell plate. The lower shell plate is in the shape of an open box. The upper shell plate body covers the opening of the lower shell plate. The ribs are in contact with the inner bottom surface of the lower shell plate. The gap between adjacent ribs, together with the inner surfaces of the upper and lower shell plates, forms a flow channel. The first flow guiding structure is disposed on the side surface of the ribs.

5. The liquid cooling plate with a flow guiding structure according to claim 1, characterized in that, The lower shell plate is recessed on one side of the surface facing the upper shell plate to form a channel, and the upper shell plate covers the channel to form a flow channel.

6. The liquid cooling plate with a flow guiding structure according to claim 5, characterized in that, At least one of the top and bottom walls of the flow channel is provided with a second flow guiding structure at intervals.

7. The liquid cooling plate with a flow guiding structure according to claim 6, characterized in that, The second flow guiding structure has a frontal surface and a backal surface facing the incoming side of the cooling fluid. The intersection of the backal surface of the second flow guiding structure and the second vertical surface forms a second included angle with the top / bottom wall surface. The second included angle σ is greater than 3° and less than 90°. The second vertical surface is a vertical surface parallel to the flow direction of the cooling fluid.

8. The liquid cooling plate with a flow guiding structure according to claim 6, characterized in that, The shape of the second flow guiding structure is selected from one or more of the following: boat-shaped, barbed, or semi-conical shell.

9. The liquid cooling plate with a flow guiding structure according to claim 6, characterized in that, The length of the second flow guiding structure along the liquid flow direction is 5% to 50% of the channel width and not less than 0.05 mm, and its height protruding from the wall is 0.05 mm to 2 mm.

10. A method for preparing a liquid-cooled plate with a flow-guiding structure as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1: Provide flat sheet metal for forming the upper and lower shell plates, cut to the required rectangular size; S2: The lower shell plate is processed to form a cavity or channel structure for containing cooling fluid; the cavity or channel structure is used to enclose the upper shell plate to form a flow channel; S3: Process the upper shell plate to form a rib structure or planar structure on its inner surface; S4: A flow guiding structure is formed on the inner wall of the flow channel between the upper shell plate and the lower shell plate by processing. The flow guiding structure is integrally formed from a local material of the inner wall surface. S5: Align and fit the upper shell plate and the lower shell plate together, and seal them together as one unit by one of the following connection methods: laser welding, diffusion welding, or high-temperature brazing.

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