Two-phase liquid cooling heat dissipation device

Abstract

This invention discloses a two-phase liquid-cooled heat dissipation device, comprising a heat absorption module, a heat dissipation module, a delivery pipe section, and a return pipe section. The heat absorption module, delivery pipe section, heat dissipation module, and return pipe section are sequentially connected end-to-end to form a closed-loop cavity. A cooling chamber is provided outside the closed-loop cavity within the heat dissipation module, and the heat dissipation module is provided with a cooling connector. A capillary column is provided inside the closed-loop cavity within the heat absorption module. One end face of the capillary column has a first channel recessed therein, and the other end face of the capillary column has a second channel recessed therein. The opening of the first channel faces the return pipe section, and the opening of the second channel faces the delivery pipe section. The distance between the first channel and the inner wall of the closed-loop cavity is greater than the distance between the second channel and the inner wall of the closed-loop cavity. Liquid returns into the capillary column, and through the unidirectional vapor-liquid action of the capillary column, the working fluid flows unidirectionally within the closed-loop cavity, avoiding mutual disturbance between the vapor and the return liquid, improving the flow efficiency of the working fluid, and enhancing the heat dissipation capacity of the device.

Description

Technical Field

[0001] This invention relates to the field of equipment heat dissipation technology, and particularly to heat dissipation devices. Background Technology

[0002] With the development of AI technology, more and more hardware devices are being used to assist in AI model calculations. Since these devices generate a lot of heat during operation, they are usually equipped with phase change cooling devices to dissipate the heat generated by the AI ​​hardware devices.

[0003] The main working principle of a phase change heat dissipation device is to transfer heat by utilizing the latent heat of the vapor-liquid two-phase change of the working fluid. Specifically, the heat pipe of the phase change heat dissipation device contains a working fluid. The liquid phase of the working fluid absorbs heat from the AI ​​hardware device to generate steam. The steam flows rapidly through the pipe cavity to the heat release end to release heat, and then condenses back into liquid for return. However, this type of structure usually has some problems: the heat pipe is usually bent into a U-shape or L-shape, utilizing the middle or end to absorb heat. During the working process, the steam and the return liquid flow in opposite directions within the same pipe cavity. The flow of the two will disturb each other, and the flow of both steam and liquid will be hindered, reducing the flow efficiency of the working fluid and limiting its heat dissipation capacity.

[0004] Furthermore, under normal heat dissipation conditions, the heat generated by AI hardware devices is balanced, and the liquid return flow rate driven by the pressure inside the pipe matches the liquid flow rate required for heat absorption phase change. However, under very high and very low heat dissipation conditions, the liquid return flow rate driven by the pressure inside the pipe will be lower than the liquid flow rate required for heat absorption phase change, gradually causing insufficient heat absorption by AI hardware devices and affecting the heat dissipation of the devices. Summary of the Invention

[0005] The purpose of this invention is to provide a two-phase liquid cooling heat dissipation device that can separate steam and return liquid, avoid disturbance between the two, and improve heat dissipation capacity.

[0006] To achieve the above objectives, a two-phase liquid cooling heat dissipation device is provided, comprising a heat absorption module, a heat dissipation module, a delivery pipe section, and a return pipe section. The heat absorption module, delivery pipe section, heat dissipation module, and return pipe section are sequentially connected end to end to form a closed loop cavity for the flow of working fluid. A cooling chamber is provided outside the closed loop cavity within the heat dissipation module, and the heat dissipation module is provided with a cooling connector communicating with the cooling chamber. A capillary column is provided inside the closed loop cavity within the heat absorption module. A first channel is recessed on one end face of the capillary column, and a second channel is recessed on the other end face of the capillary column. The opening of the first channel faces the return pipe section, and the opening of the second channel faces the delivery pipe section. The distance between the first channel and the inner wall of the closed loop cavity is greater than the distance between the second channel and the inner wall of the closed loop cavity.

[0007] According to the two-phase liquid cooling heat dissipation device, the second channel is configured as a plurality of channels arranged around the first channel.

[0008] According to the two-phase liquid cooling heat dissipation device, a capillary structure capable of absorbing liquid is provided inside the reflux pipe section on the inner side of the closed loop cavity, and one end of the capillary structure extends to the capillary column.

[0009] According to the two-phase liquid cooling heat dissipation device, both the capillary column and the capillary structure are configured as powder sintering structure or metal wire sintering structure.

[0010] According to the two-phase liquid cooling heat dissipation device, the capillary structure is configured as a capillary strip, and one end of the capillary strip extends into the first channel.

[0011] According to the two-phase liquid cooling heat dissipation device, the capillary structure is configured as a capillary tube, the outer wall of the capillary tube is in contact with the inner wall of the closed loop cavity, one end of the capillary tube extends to the other end face of the capillary column, and the other end of the capillary column extends along the closed loop cavity to pass through the heat dissipation module.

[0012] According to the two-phase liquid cooling heat dissipation device, the heat absorption module includes a first heat absorption seat, a second heat absorption seat, and a heat absorption tube section. The heat absorption tube section is sandwiched between the first heat absorption seat and the second heat absorption seat. Both ends of the heat absorption tube section are connected to the delivery tube section and the return tube section, respectively. The capillary column is located inside the heat absorption tube section.

[0013] According to the two-phase liquid cooling heat dissipation device, the heat dissipation module includes a first heat dissipation base, a second heat dissipation base, and a heat dissipation pipe section. The first heat dissipation base and the second heat dissipation base are connected and surround to form the cooling cavity. The heat dissipation pipe section passes through the cooling cavity between the first heat dissipation base and the second heat dissipation base, and both ends of the heat dissipation pipe section are respectively connected to the delivery pipe section and the return pipe section.

[0014] According to the two-phase liquid cooling heat dissipation device, the delivery pipe section, return pipe section, heat absorption pipe section and heat dissipation pipe section are integrally formed.

[0015] According to the two-phase liquid cooling heat dissipation device, an installation sleeve is provided on the outer side of the heat dissipation pipe section, and a protruding strip is provided on the outer side of the installation sleeve.

[0016] Beneficial effects: During operation, the working fluid in the closed-loop cavity absorbs heat through the heat-absorbing module, transforming into steam. The steam flows along the delivery pipe to the heat dissipation module, where it releases heat and liquefies. The liquefied working fluid then flows back along the return pipe under the impetus of subsequent fluid flow. The liquid returns into the capillary column, where the unidirectional vapor-liquid action ensures unidirectional flow of the working fluid within the closed-loop cavity, preventing disturbance between the steam and the return liquid, thus improving the flow efficiency of the working fluid and enhancing the device's heat dissipation capacity. The capillary structure located in the return pipe section can absorb the return liquid and quickly draw the liquid into the heat absorption module, which accelerates the return speed of the liquid and ensures that the heat absorption phase change has sufficient liquid flow, ensuring sufficient heat absorption for the AI ​​hardware device and ensuring normal heat dissipation of the device.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a structural diagram of the first embodiment of the two-phase liquid cooling heat dissipation device; Figure 2 This is an exploded view of the first embodiment of the two-phase liquid cooling heat dissipation device; Figure 3 This is a cross-sectional view of the first embodiment of the two-phase liquid cooling heat dissipation device; Figure 4 This is a structural diagram of a second embodiment of a two-phase liquid cooling heat dissipation device; Figure 5 This is a cross-sectional view of the capillary column in the second embodiment of the two-phase liquid cooling heat dissipation device; Figure 6 This is a structural diagram of the third embodiment of the two-phase liquid cooling heat dissipation device; Figure 7 This is a cross-sectional view of the capillary column in the third embodiment of the two-phase liquid cooling heat dissipation device; Figure 8 This is an exploded view of the fourth embodiment of the two-phase liquid cooling heat dissipation device; Figure 9 This is a cross-sectional view of the fourth embodiment of the two-phase liquid cooling heat dissipation device.

[0019] Figure 10 This is a structural diagram of the fifth embodiment of the two-phase liquid cooling heat dissipation device; Figure 11 This is a cross-sectional view of the fifth embodiment of the two-phase liquid cooling heat dissipation device; Figure 12 This is an exploded view of the fifth embodiment of the two-phase liquid cooling heat dissipation device; Figure 13 for Figure 11 The structural diagram of the capillary column and capillary strip shown; Figure 14 This is a structural diagram of the sixth embodiment of the two-phase liquid cooling heat dissipation device; Figure 15 This is a cross-sectional view of the sixth embodiment of the two-phase liquid cooling heat dissipation device. Detailed Implementation

[0020] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] Reference Figures 1 to 3 In a first embodiment of a two-phase liquid cooling heat dissipation device, the loop-type phase change heat dissipation device includes a heat absorption module 10, a heat dissipation module 20, a delivery pipe section 31, and a return pipe section 32. The heat absorption module 10, the delivery pipe section 31, the heat dissipation module 20, and the return pipe section 32 are connected end to end to form a closed loop cavity in which the working fluid can continuously circulate in one direction. The closed loop cavity is filled with the working fluid. A cooling chamber 21 is provided outside the closed loop cavity. The cooling chamber 21 is located inside the heat dissipation module 20, and the heat dissipation module 20 is provided with two cooling joints 22 communicating with the cooling chamber 21. A capillary column 40 is provided inside the closed loop cavity. A first channel 41 is recessed on one end face of the capillary column 40, and a second channel 42 is recessed on the other end face of the capillary column 40. The opening of the first channel 41 faces the return pipe section 32, and the opening of the second channel 42 faces the delivery pipe section 31. The first channel 41 and the second channel 42 are both arranged along the axial direction of the capillary column 40, and the distance between the first channel 41 and the inner sidewall of the closed loop cavity is greater than the distance between the second channel 42 and the inner sidewall of the closed loop cavity.

[0025] During operation, the working fluid within the closed-loop cavity absorbs heat through the heat-absorbing module 10, transforming into steam. The steam flows along the delivery pipe section 31 to the heat dissipation module 20, where it releases heat and liquefies (and cooling fluid is introduced into the cooling chamber 21 through the cooling connector 22, improving the efficiency of steam heat release and liquefaction, thus enhancing heat dissipation efficiency). The liquefied working fluid, propelled by subsequent fluid flow, flows back along the return pipe section 32. The liquid returns into the first channel 41 of the capillary column 40, which functions as a unidirectional vapor-liquid system. Along the direction of the working fluid flow, steam can flow out and leave the capillary column 40, while restricting the liquid from leaving the capillary column 40. Steam and liquid separate at the capillary column 40, allowing steam to flow out from the second channel 42 into the delivery pipe section 31, while confining the liquid within the return pipe section 32. Thus, through the unidirectional vapor-liquid action of the capillary column 40, the working fluid flows unidirectionally within the closed loop cavity, avoiding mutual disturbance between the vapor and the return liquid, improving the flow efficiency of the working fluid, and thereby enhancing the heat dissipation capacity of the device.

[0026] In this embodiment, the capillary column 40 has a capillary pore structure that can draw in liquid. Specifically, it can be configured as a powder sintering structure, a metal wire sintering structure, or other composite materials that can generate capillary action. By forming a capillary pore structure, the capillary column 40 can draw in liquid from the first channel 41, guiding the liquid to flow from the first channel 41 to the second channel 42. The capillary column 40 absorbs heat and conducts it to the working fluid, causing the working fluid to absorb heat and vaporize (the capillary column 40 can draw in liquid using capillary action, but can avoid liquid overflow). Combined with the flow of the working fluid, the steam flows out from the second channel 42 and then flows into the delivery pipe section 31.

[0027] In this embodiment, multiple second channels 42 are arranged around the first channel 41 to improve the heat absorption effect. The second channels 42 are located outside the first channel 41 so that the distance between the first channel 41 and the inner wall of the closed loop cavity is greater than the distance between the second channel 42 and the inner wall of the closed loop cavity, thereby reducing the conversion of liquid heat absorption in the first channel 41 into steam disturbance liquid flow.

[0028] In this embodiment, the heat absorption module 10 includes a first heat absorption seat 11, a second heat absorption seat 12, and a heat absorption tube section 13. The first heat absorption seat 11 and the second heat absorption seat 12 are connected by screws. The heat absorption tube section 13 is sandwiched between the first heat absorption seat 11 and the second heat absorption seat 12. Both ends of the heat absorption tube section 13 are connected to the delivery tube section 31 and the return tube section 32, respectively. The capillary column 40 is located inside the heat absorption tube section 13.

[0029] In this embodiment, the heat dissipation module 20 includes a first heat sink 23, a second heat sink 24, and a heat dissipation pipe section 25. The first heat sink 23 and the second heat sink 24 are connected by screws and together form the cooling cavity 21. The heat dissipation pipe section 25 is located between the first heat sink 23 and the second heat sink 24 and passes through the cooling cavity 21. Both ends of the heat dissipation pipe section 25 are connected to the delivery pipe section 31 and the return pipe section 32, respectively.

[0030] In this embodiment, the conveying pipe section 31, the return pipe section 32, the heat absorption pipe section 13, and the heat dissipation pipe section 25 are integrally formed structures, and together they form the closed loop cavity.

[0031] In this embodiment, two sealing gaskets 26 are stacked between the first heat sink 23 and the second heat sink 24. One sealing gasket 26 extends between the heat dissipation pipe section 25 and the first heat sink 23, and the other sealing gasket 26 extends between the heat dissipation pipe section 25 and the second heat sink 24. The sealing gaskets 26 can prevent the leakage of cooling fluid.

[0032] In this embodiment, two of each of the following pipe sections are provided: delivery pipe section 31, return pipe section 32, heat absorption pipe section 13, and heat dissipation pipe section 25, to form two closed loop cavities and improve heat dissipation capacity.

[0033] In this embodiment, the conveying pipe section 31, the return pipe section 32, the heat absorption pipe section 13, and the heat dissipation pipe section 25 are all circular pipes with an outer diameter of 8-12mm (usually 10mm). By using a larger pipe diameter, the heat conduction power can be increased, and heat conduction over a longer distance can be achieved, which facilitates the flexible arrangement of the heat dissipation device in some equipment.

[0034] Reference Figure 4 and Figure 5 The second embodiment of the two-phase liquid cooling heat dissipation device: in this embodiment, the delivery pipe section 31, the return pipe section 32, the heat absorption pipe section 13 and the heat dissipation pipe section 25 are all square pipes, the cross section of the closed loop cavity is square, and the corresponding capillary column 40 is also a square column.

[0035] Reference Figure 6 and Figure 7 The third embodiment of the two-phase liquid cooling heat dissipation device: In this embodiment, the cross-sections of the delivery pipe section 31, the return pipe section 32, the heat absorption pipe section 13 and the heat dissipation pipe section 25 are all racetrack-shaped, the cross-section of the closed loop cavity is racetrack-shaped, and the corresponding capillary column 40 cross-section is also racetrack-shaped.

[0036] Reference Figure 9 and Figure 10In the fourth embodiment of the two-phase liquid cooling heat dissipation device, a mounting sleeve 27 is fitted on the outer side of the heat dissipation pipe section 25, and a protrusion 271 is provided on the outer side of the mounting sleeve 27. The mounting sleeve 27 is located inside the cooling chamber 21, which can increase the heat exchange area, improve the heat release efficiency of the working fluid, and enhance the heat dissipation capacity of the heat dissipation device.

[0037] Reference Figures 10 to 13 The fifth embodiment of the two-phase liquid cooling heat dissipation device includes a capillary structure capable of absorbing liquid within the return pipe section 32 on the inner side of the closed loop cavity. One end of the capillary structure extends to the capillary column 40. The capillary structure is configured as a powder sintered structure or a metal wire sintered structure. The capillary structure located within the return pipe section 32 absorbs the returning liquid and rapidly draws it to the heat-absorbing module 10, accelerating the liquid return speed. This ensures sufficient liquid flow for the heat-absorbing phase change, guaranteeing adequate heat absorption for the AI ​​hardware device and ensuring normal operation of the device's heat dissipation.

[0038] Specifically, in this embodiment, the capillary structure is configured as capillary strips 51, which are spaced apart from the inner wall of the reflux pipe section 32. One end of the capillary column 40 extends into the first channel 41 to improve the efficiency of liquid capillary reflux.

[0039] Reference Figure 14 and Figure 15 In the first embodiment of the two-phase liquid cooling heat dissipation device, the capillary structure is configured as a capillary tube 52, with the outer wall of the capillary tube 52 in contact with the inner wall of the closed-loop cavity. Specifically, the capillary tube 52 can be sintered and fixed to the inner wall of the closed-loop cavity during sintering.

[0040] In this embodiment, the other end of the capillary structure extends along the closed loop cavity to pass through the heat dissipation module 20. This structure can improve the absorption capacity of liquid, quickly drawing the liquid back to the heat absorption module 10; and since the capillary structure passes through the heat dissipation module 20, a portion of it extends into the delivery pipe section 31, which can prevent the working fluid from liquefying in the heat dissipation module 20 and flowing back into the delivery pipe section 31.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A two-phase liquid cooling heat dissipation device, characterized in that, It includes a heat absorption module (10), a heat dissipation module (20), a delivery pipe section (31), and a return pipe section (32), wherein the heat absorption module (10), the delivery pipe section (31), the heat dissipation module (20), and the return pipe section (32) are connected end to end to form a closed loop cavity for the flow of working fluid; A cooling chamber (21) is provided on the outside of the closed loop cavity inside the heat dissipation module (20), and the heat dissipation module (20) is provided with a cooling connector (22) that communicates with the cooling chamber (21). A capillary column (40) is provided inside the heat absorption module (10) on the inner side of the closed loop cavity. A first channel (41) is recessed on one end face of the capillary column (40), and a second channel (42) is recessed on the other end face of the capillary column (40). The opening of the first channel (41) faces the return pipe section (32), and the opening of the second channel (42) faces the delivery pipe section (31). The distance between the first channel (41) and the inner wall of the closed loop cavity is greater than the distance between the second channel (42) and the inner wall of the closed loop cavity.

2. The two-phase liquid cooling heat dissipation device according to claim 1, characterized in that, The second channel (42) is configured as multiple channels arranged around the first channel (41).

3. The two-phase liquid cooling heat dissipation device according to claim 1, characterized in that, The closed loop cavity is provided with a liquid-absorbing capillary structure in the return pipe section (32) on the inner side, and one end of the capillary structure extends to the capillary column (40).

4. The two-phase liquid cooling heat dissipation device according to claim 3, characterized in that, Both the capillary column (40) and the capillary structure are configured as powder sintering structure or metal wire sintering structure.

5. The two-phase liquid cooling heat dissipation device according to claim 3, characterized in that, The capillary structure is configured as a capillary strip (51), and one end of the capillary strip (51) extends into the first channel (41).

6. The two-phase liquid cooling heat dissipation device according to claim 3, characterized in that, The capillary structure is configured as a capillary tube (52), the outer wall of the capillary tube (52) is in contact with the inner wall of the closed loop cavity, one end of the capillary tube (52) extends to the other end face of the capillary column (40), and the other end of the capillary column (40) extends along the closed loop cavity to pass through the heat dissipation module (20).

7. The two-phase liquid cooling heat dissipation device according to claim 1, characterized in that, The heat absorption module (10) includes a first heat absorption seat (11), a second heat absorption seat (12), and a heat absorption tube section (13). The heat absorption tube section (13) is sandwiched between the first heat absorption seat (11) and the second heat absorption seat (12). The two ends of the heat absorption tube section (13) are connected to the delivery tube section (31) and the return tube section (32) respectively. The capillary column (40) is located inside the heat absorption tube section (13).

8. The two-phase liquid cooling heat dissipation device according to claim 7, characterized in that, The heat dissipation module (20) includes a first heat dissipation base (23), a second heat dissipation base (24), and a heat dissipation pipe section (25). The first heat dissipation base (23) and the second heat dissipation base (24) are connected and surround to form the cooling cavity (21). The heat dissipation pipe section (25) passes through the cooling cavity (21) between the first heat dissipation base (23) and the second heat dissipation base (24), and the two ends of the heat dissipation pipe section (25) are respectively connected to the delivery pipe section (31) and the return pipe section (32).

9. The two-phase liquid cooling heat dissipation device according to claim 8, characterized in that, The conveying pipe section (31), return pipe section (32), heat absorption pipe section (13) and heat dissipation pipe section (25) are integrally formed structures.

10. The two-phase liquid cooling heat dissipation device according to claim 8, characterized in that, The heat dissipation pipe section (25) is fitted with an installation sleeve (27) on the outside, and the installation sleeve (27) is provided with a protrusion (271) on the outside.

Images