Micro-channel cold plate for pump-driven two-phase cooling system

Abstract

The invention provides a micro-channel cold plate for a pump-driven two-phase cooling system. The micro-channel cold plate for the pump-driven two-phase cooling system comprises a bottom plate, a plurality of micro-channels and a plurality of micro-channels, the cover body is connected to the bottom plate in a sealing mode, a sealing cavity is formed between the cover body and the bottom plate, and a water inlet and a water outlet are formed in the two opposite ends of the sealing cavity respectively; the fins are arrayed in the middle section of the sealing cavity so that a micro-channel communicated with the water inlet and the water outlet can be formed in the middle section of the sealing cavity, and the micro-channel at least comprises two branch channels which are partially staggered in the horizontal direction and / or the vertical direction; the cross sectional areas of the branch channels are the same or different; the reinforcing unit comprises a first reinforcing piece attached to the inner side wall of the sealing cavity and a second reinforcing piece arranged at the two ends of the micro-channel and / or between every two adjacent branch channels. The micro-channel cold plate for the pump-driven two-phase cooling system is high in overall strength and better in heat exchange effect.

Description

Technical Field

[0001] This invention belongs to the field of heat exchange technology for electronic devices, and particularly relates to a microchannel cold plate for a pump-driven two-phase cooling system. Background Technology

[0002] In recent years, the integration and thermal load of electronic devices have increased exponentially. Due to limitations in device size, temperature uniformity, and flow resistance, devices for cooling these devices must have characteristics such as small size, good temperature uniformity, and low flow resistance.

[0003] The emerging microchannel heat dissipation technology boasts a small size and effectively addresses the heat dissipation needs of high heat flux densities. Microchannels refer to channels with hydraulic diameters ranging from a few micrometers to hundreds of micrometers, and their heat dissipation fin thickness also ranges from a few micrometers to hundreds of micrometers. This allows for a significant increase in the number of fins within the same flow channel space, resulting in a substantial increase in heat dissipation area. Consequently, microchannel heat sinks can achieve heat dissipation capacities ranging from 10W / cm² to 1000W / cm². Since highly integrated electronic devices often contain numerous and densely arranged heat sources, heat exchange requires designing a corresponding microchannel heat sink at the bottom of each heat source. Connecting all the microchannel heat sinks together forms a microchannel cold plate.

[0004] However, existing microchannel cold plates only have heat dissipation fins inside their cavities, and these fins are not arranged around the inlet and outlet ports, resulting in insufficient strength around the ports. Furthermore, all the heat dissipation fins are formed on the base plate, leading to insufficient strength of the top plate opposite the fins. Therefore, the overall strength of the microchannel cold plate is insufficient. To increase strength, the top plate is typically thickened, but this inevitably increases its volume and weight. In addition, existing microchannel cold plates all use a direct-flow channel structure, where the coolant flows through each microchannel radiator along the direct-flow channel before exiting. However, the heat generated by each microchannel radiator is not uniform, resulting in low heat exchange efficiency and uneven heat exchange. Summary of the Invention

[0005] In view of the problems existing in the prior art, the main objective of the present invention is to provide a microchannel cold plate for a pump-driven two-phase cooling system. The provided microchannel cold plate for a pump-driven two-phase cooling system has high overall strength and better heat exchange effect.

[0006] The objective of this invention is achieved through the following technical solution: This invention provides a microchannel cold plate for a pump-driven two-phase cooling system, comprising: Base plate; A cover body is sealed to the base plate, and a sealed cavity is formed between the cover body and the base plate. An inlet and an outlet are respectively provided at opposite ends of the sealed cavity. Fins, a plurality of said fins are arrayed in the middle section of said sealing cavity to form a microchannel in the middle section of said sealing cavity that communicates with said inlet and outlet, said microchannel including at least two branch channels that are partially offset in the horizontal direction and / or vertical direction; said branch channels have the same / different cross-sectional area; The reinforcing unit includes a first reinforcing member attached to the inner wall of the sealing cavity, and a second reinforcing member disposed at both ends of the microchannel and / or between two adjacent branch channels.

[0007] As a further description of the above technical solution, in the flow direction of the coolant, the sealing cavity further includes an inlet section located upstream of the microchannel and an outlet section located downstream of the microchannel; wherein, The water inlet is located in the water inlet section, and the water outlet is located in the water outlet section, so as to be connected to the microchannel respectively.

[0008] As a further description of the above technical solution, the base plate is a flat plate structure, and the cover includes a main body part parallel to the base plate; The cross-sectional height of the microchannel is smaller than the cross-sectional height of the inlet / outlet water section.

[0009] As a further description of the above technical solution, the second reinforcing member includes a plurality of first protrusions formed by the inward projection of the main body portion toward the base plate, and a plurality of second protrusions formed by the inward projection of the main body portion toward the base plate; wherein, The first protrusion is located in the water inlet section and the water outlet section, respectively; The second protrusion is located in the middle section of the sealed cavity and is offset from any branch channel in the microchannel; The ends of the first and second protrusions facing the base plate both abut against the base plate.

[0010] As a further description of the above technical solution, in the direction perpendicular to the flow of the coolant, a plurality of first protrusions are distributed at equal intervals, and a plurality of second protrusions are distributed at equal intervals.

[0011] As a further description of the above technical solution, the length direction of any of the second protrusions is consistent with the flow direction of the coolant.

[0012] As a further description of the above technical solution, the cross-sectional width of any of the branch channels is equal to the cross-sectional width of the fin.

[0013] As a further description of the above technical solution, it also includes multiple weight-reducing grooves, each of which is formed by an inward recess of the side of the main body facing away from the bottom plate.

[0014] As a further description of the above technical solution, the periphery of the cover facing the bottom plate and the side of the first reinforcing member facing the bottom plate are both welded to the bottom plate.

[0015] As a further description of the above technical solution, the base plate and the fins are an integral structure.

[0016] By employing the above technical solutions, the outstanding effects of this invention are as follows: The microchannel cold plate for a pump-driven two-phase cooling system provided by this invention includes a cover that is sealed to a base plate to form a sealed cavity. Inlet and outlet water outlets are respectively provided at opposite ends of the sealed cavity. Multiple fins are arranged in an array in the middle section of the sealed cavity to form a microchannel communicating with the inlet and outlet water outlets. Simultaneously, the microchannel includes at least two partially staggered branch channels in the horizontal and / or vertical directions, with each branch channel having the same / different cross-sectional area. Therefore, after the coolant flows into the sealed cavity through the inlet, it undergoes three-dimensional spatial diversion through the branch channels included in the microchannel to continuously exchange heat with the fins, and to a greater extent ensures a more uniform residual heat after heat exchange. Furthermore, the reinforcing unit includes a first reinforcing member attached to the inner wall of the sealed cavity, and a second reinforcing member located at both ends of the microchannel and / or between two adjacent branch channels, increasing the overall strength of the microchannel cold plate and effectively extending its heat exchange life. Attached Figure Description

[0017] Figure 1 This is an exploded view of the microchannel cold plate used in the pump-driven two-phase cooling system in the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure in the first embodiment of the present invention, showing the reinforcing unit disposed within the cover body; Figure 3 This is a schematic diagram of the external structure of the cover in the first embodiment of the present invention; Figure 4 This is a partial structural diagram of the fins and base plate combined in the first embodiment of the present invention; Figure 5 This is a front view of the fins and base plate combined in the first embodiment of the present invention; Figure 6 This is a side view of the fins and the base plate combined in the first embodiment of the present invention; Figure 7 This is a top view of the fins and the base plate combined in the first embodiment of the present invention; Figure 8 This is a front view of the fins and base plate combined in the second embodiment of the present invention; Figure 9 This is a front view of the fins and base plate combined in the third embodiment of the present invention; Figure 10This is a side view of the fins and the base plate combined in the third embodiment of the present invention; Figure 11 This is a top view of the fins and base plate combined in the third embodiment of the present invention; Figure 12 This is a front view of the fins and the base plate combined in the fourth embodiment of the present invention.

[0018] Explanation of icon numbers: 1. Base plate; 2. Cover; 3. Inlet; 4. Outlet; 5. Fins; 6. Branch channel; 7. First reinforcing member; 8. Second reinforcing member; 9. First protrusion; 10. Second protrusion; 11. Weight reduction groove; 12. Inlet connector; 13. Outlet connector. Detailed Implementation

[0019] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The embodiments of this invention will now be described according to its overall structure.

[0021] Please see Figures 1 to 12 This invention discloses a microchannel cold plate for a pump-driven two-phase cooling system, the disclosed microchannel cold plate for a pump-driven two-phase cooling system comprising: Base plate 1; Cover 2 is sealed to the base plate 1, and a sealed cavity is formed between the cover 2 and the base plate 1. Water inlet 3 and water outlet 4 are respectively opened at opposite ends of the sealed cavity. Fins 5, a plurality of fins 5 are arrayed in the middle section of the sealing cavity to form a microchannel in the middle section of the sealing cavity that communicates with the inlet 3 and the outlet 4. The microchannel includes at least two branch channels 6 that are partially offset in the horizontal and / or vertical directions; the cross-sectional areas of each branch channel 6 are the same or different. The reinforcing unit includes a first reinforcing member 7 attached to the inner sidewall of the sealing cavity, and a second reinforcing member 8 disposed at both ends of the microchannel and / or between two adjacent branch channels 6.

[0022] In the above configuration, the cover 2 of the microchannel cold plate for the pump-driven two-phase cooling system is sealed to the base plate 1 to form a sealed cavity with the base plate 1. The two opposite ends of the sealed cavity are respectively provided with an inlet 3 and an outlet 4. The middle section of the sealed cavity is arrayed with multiple fins 5 so that the middle section of the sealed cavity forms a microchannel that communicates with the inlet 3 and the outlet 4. At the same time, the microchannel includes at least two branch channels 6 that are partially staggered in the horizontal and / or vertical directions, and the cross-sectional areas of each branch channel 6 are the same or different. Therefore, after the coolant flows into the sealed cavity through the inlet 3, it will be split in three-dimensional space through each branch channel 6 included in the microchannel to continuously exchange heat with the fins 5, and to a greater extent ensure that the residual heat of the fins 5 after heat exchange is more uniform. Meanwhile, the first reinforcing member 7 of the reinforcing unit is attached to the inner side wall of the sealing cavity, and the second reinforcing member 8 is disposed at both ends of the microchannel and / or between two adjacent branch channels 6, thereby increasing the overall strength of the microchannel cold plate and effectively extending its heat exchange life.

[0023] Please see Figures 1 to 7Specifically, in this embodiment, the flow direction of the coolant is defined as from right to left. The inlet 3 at the upper right end of the cover 2 and the outlet at its upper left end are respectively connected to an inlet connector 12 and an outlet connector 13. Therefore, after the coolant flows from the inlet connector 12 into the inlet 3, it flows into the sealed cavity formed by the base plate 1 and the cover 2, then flows to the left into the branch channels 6 of the microchannel, and then flows to the outlet 4, and is discharged through the outlet connector 13 to carry away the heat conducted to the fins 5. More specifically, the sealed cavity also includes an inlet section located at the right end (upstream) of the microchannel and an outlet section located at the left end (downstream) of the microchannel; wherein, the inlet 3 is opened in the inlet section and the outlet 4 is opened in the outlet section, so as to be connected to both ends of the microchannel respectively. The microchannel comprises four horizontally staggered but interconnected branch channels 6 from right to left. Each branch channel 6 includes multiple branch channels 6, and each branch channel 6 has the same cross-sectional area. The cross-sectional width of the staggered sections between two interconnected branch channels 6 can be set according to heat dissipation requirements, for example, by half the width of each other. Of course, in other embodiments, such as... Figures 8 to 12 As shown, the microchannel can also be configured with more or fewer segments of branch channels 6 along the flow direction of the coolant, and the upstream and downstream branch channels 6 are horizontally staggered and interconnected. Furthermore, in another embodiment, the microchannel can be configured with multiple vertically staggered and interconnected segments of branch channels 6, depending on actual heat dissipation requirements. Each segment of branch channel 6 can also contain multiple horizontally arranged branch channels 6, and the length ratio of each segment of branch channel 6 can be set according to actual needs.

[0024] Please continue reading. Figures 1 to 7 Specifically, in this embodiment, the base plate 1 is a flat plate structure, and the cover 2 includes a main body part parallel to the base plate 1; the cross-sectional height of the microchannel is smaller than the cross-sectional height of the inlet / outlet water section.

[0025] Specifically, in this embodiment, the second reinforcing member 8 includes eight first protrusions 9 formed by the inward protrusion of the main body portion facing the bottom plate 1, and two second protrusions 10 formed by the inward protrusion of the main body portion facing the bottom plate 1; wherein, the first protrusions 9 are columnar and are divided into two groups respectively disposed in the water inlet section and the water outlet section; the second protrusions 10 are strips extending left and right and are disposed in the middle section of the sealing cavity and are offset from any branch channel 6 in the microchannel without affecting the flow of coolant; the ends of the first protrusions 9 and the second protrusions 10 facing the bottom plate 1 abut against the bottom plate 1, so as to improve the strength of the cavity wall of the sealing cavity.

[0026] Specifically, in this embodiment, in the direction perpendicular to the flow of the coolant, each group of the first protrusions 9 are distributed at equal intervals in the water inlet section and the water outlet section, and two second protrusions 10 are distributed at equal intervals in the middle section of the sealing cavity to uniformly strengthen the cavity wall strength of the sealing cavity.

[0027] Specifically, in this embodiment, the cross-sectional width of any of the branch channels 6 is equal to the cross-sectional width of the fins 5.

[0028] Specifically, in this embodiment, seven weight-reducing grooves 11 are also included. Each of the weight-reducing grooves 11 is recessed inward from the side of the main body facing away from the bottom plate 1. One weight-reducing groove 11 is located in the middle of the main body, and the other six weight-reducing grooves 11 are located on the periphery of the main body and are connected to the edge of the main body. The weight-reducing grooves 11 effectively reduce the weight of the cover 2. In addition, since the cover 2 also needs to be connected to other components of the two-phase cooling system using fasteners, the specific position of the weight-reducing grooves 11 on the periphery of the main body can be set according to the locking position of the fastener (e.g., positioning hole), so that the locking position of the fastener is located in the weight-reducing groove 11 on the periphery of the main body, which also facilitates the installation of the fastener.

[0029] Specifically, in this embodiment, the periphery of the cover 2 facing the bottom plate 1 and the side of the first reinforcing member 7 facing the bottom plate 1 are both welded to the bottom plate 1.

[0030] Specifically, in this embodiment, the base plate 1 and the fins 5 are an integral structure.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any changes, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A microchannel cold plate for a pump-driven two-phase cooling system, characterized in that, include: Base plate; A cover body is sealed to the base plate, and a sealed cavity is formed between the cover body and the base plate. An inlet and an outlet are respectively provided at opposite ends of the sealed cavity. Fins, a plurality of said fins are arrayed in the middle section of said sealing cavity to form a microchannel in the middle section of said sealing cavity that communicates with said inlet and outlet, said microchannel including at least two branch channels that are partially offset in the horizontal direction and / or vertical direction; said branch channels have the same / different cross-sectional area; The reinforcing unit includes a first reinforcing member attached to the inner wall of the sealing cavity, and a second reinforcing member disposed at both ends of the microchannel and / or between two adjacent branch channels.

2. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 1, characterized in that, In the direction of coolant flow, the sealing cavity further includes an inlet section located upstream of the microchannel and an outlet section located downstream of the microchannel; wherein, The water inlet is located in the water inlet section, and the water outlet is located in the water outlet section, so as to be connected to the microchannel respectively.

3. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 2, characterized in that, The base plate is a flat plate structure, and the cover includes a main body part parallel to the base plate; The cross-sectional height of the microchannel is smaller than the cross-sectional height of the inlet / outlet water section.

4. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 3, characterized in that, The second reinforcing member includes a plurality of first protrusions formed by the inward projection of the main body portion toward the base plate, and a plurality of second protrusions formed by the inward projection of the main body portion toward the base plate; wherein, The first protrusion is located in the water inlet section and the water outlet section, respectively; The second protrusion is located in the middle section of the sealed cavity and is offset from any branch channel in the microchannel; The ends of the first and second protrusions facing the base plate both abut against the base plate.

5. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 4, characterized in that, In the direction perpendicular to the flow of the coolant, a plurality of first protrusions are distributed at equal intervals, and a plurality of second protrusions are distributed at equal intervals.

6. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 5, characterized in that, The length direction of any of the second protrusions is consistent with the flow direction of the coolant.

7. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 3, characterized in that, The cross-sectional width of any of the branch channels is equal to the cross-sectional width of the fin.

8. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 3, characterized in that, It also includes multiple weight-reducing grooves, each of which is formed by an inward recess from the side of the main body facing away from the bottom plate.

9. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 1, characterized in that, The periphery of the cover facing the base plate and the side of the first reinforcing member facing the base plate are both welded to the base plate.

10. The microchannel cold plate for a pump-driven two-phase cooling system according to claim 1, characterized in that, The base plate and the fins are an integral structure.

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