Fish scale-like fin type micro-channel cold plate with secondary channel

Abstract

The invention relates to the technical field of electronic information, and discloses a scale-like fin type micro-channel cold plate with a secondary channel. A first flowing channel is formed in the cold plate body; the fin plates are sequentially laid in the first flowing channel in the first direction, a plurality of fish scale-shaped protrusions are sequentially arranged on the two side faces of each fin plate in the flowing direction of the cooling liquid in a staggered mode, and the section of each fish scale-shaped protrusion is of a semi-oval structure; fish scale-shaped grooves are formed in the other side surfaces, corresponding to the fish scale-shaped bulges, of the fin plates; and each second flow channel is formed between every two adjacent fin plates. According to the fish scale-like fin type micro-channel cold plate containing the secondary channels, the flowing pressure of cooling liquid in the micro-channels is reduced, a boundary layer is broken, the heat dissipation temperature of the cold plate is uniform, and meanwhile the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of electronic information technology, and in particular to a fish scale fin-like microchannel cold plate containing a secondary channel. Background Art

[0002] As electronic systems develop towards high integration, high power and miniaturization, the performance of electronic products will be improved, but the heat flux density will also increase significantly. If appropriate heat dissipation measures are not taken, the temperature of the electronic products will be too high. If there are multiple heat sources inside the chip, there will also be uneven temperature distribution. These problems have posed new challenges to the existing heat dissipation system. Microfluidic heat dissipation technology, as one of the new heat dissipation technologies, has the advantages of miniaturization, high heat dissipation efficiency, and low thermal resistance. In practical applications, it can meet the heat dissipation and temperature uniformity requirements of miniaturized electronic products.

[0003] As the heat flux density of power chips increases sharply, the demand for heat dissipation rises sharply. Most of the current microchannel cold plates use rectangular fins. Multiple rectangular fins are arranged in sequence along the width of the microchannel cold plate, and rectangular channels are formed between adjacent rectangular fins. During the flow of the fluid in the rectangular channel, due to the gradual thickening of the boundary layer, the temperature of the fluid near the outlet will be much higher than the temperature at the inlet. The heat exchange performance of the microchannel cold plate gradually deteriorates, reducing the overall heat dissipation uniformity of the microchannel cold plate, resulting in poor temperature uniformity of the chip. At the same time, due to the gradual thickening of the boundary layer, the flow pressure of the coolant in the microchannel is relatively large. Therefore, when the microchannel cold plate is running for a long time, the long and straight rectangular channel is easily blocked, resulting in poor heat dissipation efficiency and uneven heat dissipation temperature. Summary of the invention

[0004] The purpose of the present invention is to provide a fish scale fin type microchannel cold plate with secondary channels, which reduces the flow pressure of the coolant in the microchannel, breaks the boundary layer, makes the heat dissipation temperature of the cold plate uniform and improves the heat dissipation efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: Design a fish scale fin type microchannel cold plate with secondary channels, including: A cold plate body, wherein a first flow channel is opened inside; A plurality of fin plates are sequentially laid in the first flow channel along a first direction, and a plurality of fish scale-like protrusions are sequentially staggeredly arranged on both sides of the fin plates along the flow direction of the coolant, and the cross section of the fish scale-like protrusions is a semi-elliptical structure; The other side of the fin plate corresponding to the fish-scale-shaped protrusion is provided with a fish-scale-shaped groove; The second flow channel is formed between two adjacent fin plates.

[0006] Optionally, the plurality of fish-scale protrusions on one side of the fin plate are staggered along the second direction relative to the plurality of fish-scale protrusions on the other side.

[0007] Optionally, the fish scale-like protrusions include first fish scales and second fish scales, the first fish scales are arranged on the surface of the fin plate, and the second fish scales are arranged on the surface of the first fish scales away from the fin plate.

[0008] Optionally, the fish-scale groove includes a first groove and a second groove, wherein the first groove is opened on the surface of the fin plate, and the second groove is opened at the bottom of the first groove.

[0009] Optionally, the cold plate body further includes an upper cover plate and a lower cover plate, the lower surface of the upper cover plate is fixedly connected to the lower cover plate via a groove, and the first flow channel is located between the upper cover plate and the lower cover plate.

[0010] Optionally, the first flow channel includes a water distribution area, an installation area and a collection area which are arranged in sequence along the flow direction of the coolant, the water distribution area, the installation area and the collection area are interconnected, and the plurality of fin plates are laid in sequence in the installation area along the first direction.

[0011] Optionally, the cross-sections of the water distribution area and the collection area are both arranged in a trapezoidal shape, and the water distribution area and the collection area are both connected to the installation area through a larger opening.

[0012] Optionally, a water inlet joint and a water outlet joint are provided on the upper cover plate, the outlet of the water inlet joint is connected to the water distribution area, and the inlet of the water outlet joint is connected to the collection area.

[0013] Optionally, the upper cover plate includes an upper cover block and a bottom plate, the upper cover block is fixedly connected to the upper surface of the bottom plate, the first flow channel is opened on the lower surface of the upper cover block, and the lower surface of the bottom plate is fixedly connected to the lower cover plate via a groove opened in communication with the first flow channel.

[0014] Optionally, the lower surface of the upper cover plate is located outside the lower cover plate and has two slide grooves along the flow direction of the coolant, and the two slide grooves are symmetrically arranged on the lower surface of the upper cover plate.

[0015] The present invention provides a fish scale fin type microchannel cold plate with secondary channels, which has the following beneficial effects: The fish-scale fin-like microchannel cold plate with secondary channels allows the coolant to flow into the first flow channel, and the coolant entering the first flow channel flows into the second flow channel formed between the fin plates, and then flows out of the second flow channel after passing through the fish-scale-like protrusions and the fish-scale-like grooves. The fin plates and the second flow channels are arranged to make the structure compact and improve the space utilization rate. The fish-scale-like protrusions form eddies (or turbulence) when the coolant flows, and the eddies can make the coolant more mixed during the flow process. After the high-temperature fluid and the low-temperature fluid are mixed, the heat can be quickly transferred from the high-temperature area to the low-temperature area, thereby enhancing the disturbance and heat transfer of the coolant and allowing the coolant to form sufficient disturbance in the channel. , breaking the boundary layer, cooperating with the fish-scale protrusions on the opposite surfaces of two adjacent fin plates arranged in sequence, and the fish-scale grooves on the opposite surfaces of two adjacent fin plates corresponding to the fish-scale protrusions, further enhancing the fluid disturbance, promoting the formation of more delicate vortices, thereby further improving the heat exchange efficiency, and then improving the heat dissipation efficiency, and also avoiding the situation where the local flow rate is too fast or too slow, ensuring the overall heat dissipation uniformity of the cold plate, and making the coolant flow more smoothly in the microchannel through the fish-scale protrusions, reducing pressure loss, making the pump power required to drive the coolant lower, saving energy, thereby achieving the purpose of improving the heat exchange and heat dissipation efficiency, but also saving energy use and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the exploded structure of the fish scale fin-like microchannel cold plate containing secondary channels in the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the fish scale fin-like microchannel cold plate containing secondary channels in the present invention; Figure 3 It is a schematic diagram of the top cross-sectional structure of the cooling plate body in the present invention; Figure 4 It is a schematic diagram of the side cross-sectional structure of the cold plate body in the present invention; Figure 5 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle; Figure 6 For the present invention Figure 1 Schematic diagram of the local enlarged structure at point B in the middle.

[0017] In the figure: 100, cold plate body; 110, first flow channel; 111, water distribution area; 112, installation area; 113, collection area; 120, upper cover plate; 121, upper cover block; 122, bottom plate; 130, lower cover plate; 140, water inlet joint; 150, water outlet joint; 160, chute; 200, fin plate; 300, fish scale-like protrusion; 310, first fish scale; 320, second fish scale; 400, fish scale-like groove; 410, first groove; 420, second groove; 500, second flow channel. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0019] See also Figures 1 to 6 , The present invention provides a technical solution: a fish scale fin type microchannel cold plate with secondary channels, comprising; The cold plate body 100 has a first flow channel 110 formed therein; A plurality of fin plates 200 are sequentially laid in the first flow channel 110 along a first direction, and a plurality of fish scale-like protrusions 300 are sequentially staggeredly arranged on both sides of the fin plates 200 along the flow direction of the coolant, and the cross section of the fish scale-like protrusions 300 is a semi-elliptical structure; The other side of the fin plate 200 corresponding to the fish-scale protrusion 300 is provided with a fish-scale groove 400; A second flow channel 500 is formed between two adjacent fin plates 200; The first flow channel 110 is the main flow path of the coolant, which is used to guide the coolant to the inside of the cold plate body 100 and evenly distribute the coolant to multiple fin plates 200, ensuring that each fin plate 200 can contact the coolant, thereby improving the overall heat dissipation efficiency. The fin plates 200 are laid in sequence along the first direction to ensure that the coolant can smoothly flow through the entire cold plate, avoid local flow speed being too fast or too slow, and perform effective heat exchange. The other side of the fin plate 200 corresponding to the fish scale-like protrusion 300 is provided with a fish scale-like groove 400. This design can increase the contact area of ​​the coolant, thereby improving the heat transfer effect. The cross-section of the fish scale-like protrusion 300 is a semi-elliptical structure that gradually increases along the flow direction curve of the coolant, which can effectively guide the fluid flow , reducing fluid separation and forming a stable turbulence effect. The fish-scale protrusions 300 can form eddies and turbulences during fluid flow, break the boundary layer of the fluid, and enhance heat transfer efficiency. The fish-scale protrusions 300 are staggered along the two sides of the fin plate 200, and the fish-scale protrusions 300 on the opposite surfaces of the fin plate 200 cooperate with each other, so that the fluid is disturbed multiple times when flowing through, further improving the heat exchange efficiency. The fish-scale grooves 400 also play a role in guiding the flow of the fluid, so that the fluid can be evenly distributed when flowing through the fin plate 200, and cooperate with the fish-scale protrusions 300 to further disturb the coolant. The second flow channel 500 is used for the coolant to flow evenly throughout the cold plate, avoiding the formation of local hot spots and ensuring uniform temperature distribution. The cross section of the fish scale-shaped protrusion 300 is perpendicular to the first direction; The fish-scale protrusion 300 has a smooth curved surface, which can guide the fluid flow more effectively, and can maintain a low flow resistance (low resistance coefficient) while disturbing the fluid, thereby reducing the energy consumption of the pump. When the fluid flows through the surface, uniform disturbances and eddies are formed, making heat transfer more uniform and efficient. The fish-scale curved surface can effectively destroy the boundary layer of the fluid.

[0020] In this embodiment, as a preferred solution, the plurality of fish scale-shaped protrusions 300 on one side of the fin plate 200 are staggered along the second direction relative to the plurality of fish scale-shaped protrusions 300 on the other side. The fish scale-shaped protrusions 300 staggered along the second direction further disturb the flow of the coolant during its flow, thereby increasing the vortex generated when the coolant flows. That is, the side of the fin plate 200 includes a first side and a second side, a first number of fish-scale protrusions 300 are arranged at intervals on the first side along the flow direction of the coolant, and a second number of fish-scale protrusions 300 are arranged at intervals on the second side along the flow direction of the coolant, and the first number is equal to the second number; on the first side, the fin plate 200 is formed with a corresponding number of fish-scale grooves 400 corresponding to the fish-scale protrusions 300 on the second side, and at this time, the fish-scale protrusions 300 and the fish-scale grooves 400 are staggered; that is to say, on the second side, the fin plate 200 is also formed with a corresponding number of fish-scale grooves 400 corresponding to the fish-scale protrusions 300 on the first side, and the fish-scale protrusions 300 and the fish-scale grooves 400 are staggered.

[0021] On the basis of this preferred solution, on any side surface, along the second direction, the fish-scale protrusions 300 and the fish-scale grooves 400 are arranged in a staggered manner.

[0022] As another optional solution, the side of the fin plate 200 includes a first side and a second side, and a first number of fish scale-shaped protrusions 300 are sequentially arranged at intervals along the flow direction of the coolant on the first side, and a second number of fish scale-shaped protrusions 300 are sequentially arranged at intervals along the flow direction of the coolant on the second side; at this time, on the first side, the fin plate 200 is formed with a corresponding number of fish scale-shaped grooves 400 corresponding to the fish scale-shaped protrusions 300 on the second side, and at this time, the fish scale-shaped protrusions 300 and the fish scale-shaped grooves 400 can be arranged in a staggered manner: a fish scale-shaped groove 400 is arranged in the middle of four fish scale-shaped protrusions 300, and at this time, the first number is not equal to the second number, and the specific ratio of the first number to the second number is determined according to the above arrangement form; As another optional scheme, the side of the fin plate 200 includes a first side and a second side, and a first number of fish-scale protrusions 300 are arranged at intervals on the first side along the flow direction of the coolant, and a second number of fish-scale protrusions 300 are arranged at intervals on the second side along the flow direction of the coolant; at this time, on the first side, the fin plate 200 is formed with a corresponding number of fish-scale grooves 400 corresponding to the fish-scale protrusions 300 on the second side, and at this time, the fish-scale protrusions 300 and the fish-scale grooves 400 can be: two fish-scale grooves 400 are arranged in the middle of four fish-scale protrusions 300 in a staggered arrangement form, and at this time, the first number is not equal to the second number, and the specific ratio of the first number to the second number is determined according to the above arrangement form.

[0023] In this embodiment, as a preferred solution, the fish scale-like protrusion 300 includes a first fish scale 310 and a second fish scale 320. The first fish scale 310 is arranged on the surface of the fin plate 200, and the second fish scale 320 is arranged on the surface of the first fish scale 310 away from the fin plate 200. The larger fish scale-like protrusion 300 fits the surface of the fin body to form a stable base layer to ensure the mechanical stability of the entire protrusion structure. The smaller fish scale-like protrusion 300 further refines the surface structure, increases the contact area and the degree of fluid disturbance. That is, the first fish scales 310 and the second fish scales 320 are sequentially stacked on the surface of the fin plate 200 along the second direction.

[0024] Boundary layer is an important concept in fluid mechanics. It refers to the layer of fluid area close to the solid surface during the flow of fluid. In this area, the velocity of the fluid gradually increases from zero velocity on the solid surface (due to viscosity and no-slip conditions) to a velocity close to that of the free fluid. When a fluid (such as air, water, etc.) flows over a solid surface (such as a pipe wall, an aircraft wing, a cold plate, etc.), due to the viscosity of the fluid, the fluid molecules close to the solid surface will be subject to resistance from the solid surface, causing the velocity of these molecules to decrease to almost zero (no-slip condition). As the distance from the solid surface increases, the velocity of the fluid molecules gradually increases until it reaches the velocity of the free fluid. During the heat transfer process, the existence of the boundary layer will affect the heat transfer efficiency. A thicker boundary layer will increase thermal resistance and reduce heat transfer efficiency; while a thinner boundary layer will help improve heat transfer efficiency.

[0025] In this embodiment, as a preferred solution, the fish-scale groove 400 includes a first groove 410 and a second groove 420 . The first groove 410 is formed on the surface of the fin plate 200 , and the second groove 420 is formed at the bottom of the first groove 410 .

[0026] In this embodiment, as a preferred solution, the cold plate body 100 also includes an upper cover plate 120 and a lower cover plate 130. The lower surface of the upper cover plate 120 is fixedly connected to the lower cover plate 130 through an opened groove. The first flow channel 110 is located between the upper cover plate 120 and the lower cover plate 130. The connection between the upper cover plate 120 and the lower cover plate 130 can be sealed by welding or by fixing with a sealing ring and bolts.

[0027] In this embodiment, as a preferred solution, the first flow channel 110 includes a water distribution area 111, an installation area 112 and a collection area 113 which are sequentially arranged along the flow direction of the coolant, the water distribution area 111, the installation area 112 and the collection area 113 are interconnected, and a plurality of fin plates 200 are sequentially laid in the installation area 112 along the first direction; The cross-sections of the water distribution area 111 and the collection area 113 are both arranged in a trapezoidal shape, and the water distribution area 111 and the collection area 113 are both connected to the installation area 112 through a relatively large opening; The water distribution area 111 is provided for the entry of coolant. Meanwhile, the trapezoidal setting of the water distribution area 111 allows the coolant entering the water distribution area 111 to be evenly distributed, and then enters the installation area 112 to flow through the fin plate 200. This can control the flow rate and flow velocity of the coolant, and avoid local over-flow or uneven flow velocity when the fluid enters the installation area 112. The coolant has a uniform flow velocity and pressure when entering the installation area 112. The setting of the collection area 113 ensures that the pressure of the coolant is uniform before it flows out, and then the coolant is discharged.

[0028] In this embodiment, as a preferred solution, a water inlet joint 140 and a water outlet joint 150 are provided on the upper cover plate 120. The outlet of the water inlet joint 140 is connected to the water distribution area 111, and the inlet of the water outlet joint 150 is connected to the collection area 113. Through the setting of the water inlet joint 140, one end is connected to the coolant source to transport the coolant into the water distribution area 111, and through the setting of the water outlet joint 150, the coolant in the collection area 113 is discharged.

[0029] In this embodiment, as a preferred solution, the upper cover plate 120 includes an upper cover block 121 and a bottom plate 122, the upper cover block 121 is fixedly connected to the upper surface of the bottom plate 122, the first flow channel 110 is opened on the lower surface of the upper cover block 121, and the lower surface of the bottom plate 122 is fixedly connected to the lower cover plate 130 through a groove opened to communicate with the first flow channel 110; The upper cover block 121 is fixedly connected to the bottom plate 122, and the bottom plate 122 provides an installation position for the device, such as a mounting hole for screwing bolts, and the upper cover block 121 supports the first flow channel 110. At the same time, the thickness from the outside of the upper cover block 121 to the first flow channel 110 is reduced, which plays a role in auxiliary heat dissipation and improves the heat dissipation efficiency compared to a flat plate.

[0030] In this embodiment, as a preferred solution, the lower surface of the upper cover plate 120 is located outside the lower cover plate 130 and has two slide grooves 160 along the flow direction of the coolant. The two slide grooves 160 are symmetrically arranged on the lower surface of the upper cover plate 120. The arrangement of the slide grooves 160 facilitates the installation of the upper cover plate 120 and facilitates adjustment after installation in the cooling position. Pre-positioning can be achieved through the slide grooves 160.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fish scale fin type microchannel cold plate with secondary channels, characterized in that: include; A cold plate body (100) having a first flow channel (110) formed therein; A plurality of fin plates (200) are sequentially laid in the first flow channel (110) along a first direction, and a plurality of fish-scale-like protrusions (300) are sequentially and alternately arranged on two side surfaces of the fin plates (200) along the flow direction of the coolant, wherein the cross-section of the fish-scale-like protrusions (300) is a semi-elliptical structure; The other side surface of the fin plate (200) corresponding to the fish-scale-shaped protrusion (300) is provided with a fish-scale-shaped groove (400); A second flow channel (500) is formed between two adjacent fin plates (200).

2. The fish scale fin type microchannel cold plate with secondary channels according to claim 1, characterized in that: The plurality of fish-scale protrusions (300) on one side of the fin plate (200) are arranged in a staggered manner along the second direction relative to the plurality of fish-scale protrusions (300) on the other side.

3. The fish scale fin type microchannel cold plate with secondary channels according to claim 1, characterized in that: The fish scale-shaped protrusion (300) comprises a first fish scale (310) and a second fish scale (320), wherein the first fish scale (310) is arranged on the surface of the fin plate (200), and the second fish scale (320) is arranged on the surface of the first fish scale (310) away from the fin plate (200).

4. The fish scale fin type microchannel cold plate with secondary channels according to claim 1, characterized in that: The fish-scale groove (400) comprises a first groove (410) and a second groove (420), wherein the first groove (410) is provided on the surface of the fin plate (200), and the second groove (420) is provided at the bottom of the first groove (410).

5. The fish scale fin type microchannel cold plate with secondary channels according to claim 1, characterized in that: The cold plate body (100) further comprises an upper cover plate (120) and a lower cover plate (130); the lower surface of the upper cover plate (120) is fixedly connected to the lower cover plate (130) via a groove; and the first flow channel (110) is located between the upper cover plate (120) and the lower cover plate (130).

6. The fish scale fin type microchannel cold plate with secondary channels according to claim 5, characterized in that: The first flow channel (110) comprises a water distribution area (111), a mounting area (112) and a collection area (113) which are arranged in sequence along the flow direction of the coolant; the water distribution area (111), the mounting area (112) and the collection area (113) are interconnected; and a plurality of fin plates (200) are laid in sequence in the mounting area (112) along the first direction.

7. The fish scale fin type microchannel cold plate with secondary channels according to claim 6, characterized in that: The cross-sections of the water distribution area (111) and the collection area (113) are both arranged in a trapezoidal shape, and the water distribution area (111) and the collection area (113) are both connected to the installation area (112) via a relatively large opening.

8. The fish scale fin type microchannel cold plate with secondary channels according to claim 6, characterized in that: A water inlet joint (140) and a water outlet joint (150) are provided on the upper cover plate (120); the outlet of the water inlet joint (140) is in communication with the water distribution area (111), and the inlet of the water outlet joint (150) is in communication with the collection area (113).

9. The fish scale fin type microchannel cold plate with secondary channels according to claim 8, characterized in that: The upper cover plate (120) comprises an upper cover block (121) and a bottom block (122); the upper cover block (121) is fixedly connected to the upper surface of the bottom block (122); the first flow channel (110) is opened on the lower surface of the upper cover block (121); and the lower surface of the bottom block (122) is fixedly connected to the lower cover plate (130) via a groove opened therein and communicating with the first flow channel (110).

10. The fish scale fin type microchannel cold plate with secondary channels according to claim 5, characterized in that: The lower surface of the upper cover plate (120) is located outside the lower cover plate (130) and has two slide grooves (160) along the flow direction of the coolant. The two slide grooves (160) are symmetrically arranged on the lower surface of the upper cover plate (120).

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