A cold head and liquid cooling heat sink

Abstract

The utility model discloses a cold head and liquid cooling radiator, including contact board and cover, the back of contact board is provided with multiple sets of radiating group, and each radiating group includes the fin of multiple pieces of array setting, the cover includes the cylinder and sets up the bottom cover on one side opening of cylinder, and the cavity is formed between cylinder and bottom cover, in the cavity, the surface of bottom cover extends upward and forms the flow baffle, and the cavity is divided into the flow cavity and the radiating cavity by flow baffle, and the liquid inlet hole of communication with flow cavity is arranged on the cylinder, and the liquid outlet hole of communication with radiating cavity is arranged on the bottom cover, the cover is installed on the back of contact board, and the clearance between the end face of flow baffle and the back of contact board is communicated between flow cavity and radiating cavity, in each radiating group, the micro radiating flow channel is formed between the fin of two adjacent pieces, and the entrance of micro radiating flow channel is towards flow baffle. The cold head has good radiating efficiency through the improvement of contact board and cover structure.

Description

Technical Field

[0001] This utility model relates to the field of heat sinks, specifically to a cold head and liquid cooling heat sink. Background Technology

[0002] As semiconductor devices evolve towards higher integration and higher power density, traditional air cooling and aluminum extrusion heat dissipation solutions are struggling to keep junction temperatures within safe ranges. Liquid cooling technology has become mainstream due to its advantages such as high heat transfer coefficient, small temperature gradient, and low noise. In existing cold head designs, the control of the water channels is generally achieved through a water circuit board. Miniature water channels are CNC machined into the water circuit board to guide the refrigerant flow. During the CNC machining of the water channels, the wall structures on both sides of the water channels can be understood as heat dissipation fin structures.

[0003] Currently, the main focus of water circuit board design is to increase the area coverage of the micro water circuit board, while neglecting the design of the fin structure. In conventional CNC machining, the fin height is limited by the length-to-diameter ratio of the machining tool. When the height-to-width ratio is greater than 8, the tool is prone to breakage, making it difficult to further reduce the hydraulic diameter of the channel, thus limiting the improvement of the fin's heat dissipation capacity. Utility Model Content

[0004] This utility model provides a cold head and a liquid cooling radiator. The cold head improves the heat dissipation efficiency by modifying the structure of the contact plate and the cover to increase the contact area between the coolant and the fins.

[0005] Accordingly, this utility model provides a cold head, including a contact plate and a cover; The front of the contact plate is a heat dissipation contact surface, and multiple heat dissipation groups are provided on the back of the contact plate. Each heat dissipation group includes multiple heat dissipation fins arranged in an array. The cover includes a cylindrical body and a bottom cover disposed on an opening on one side of the cylindrical body, and a cavity is formed between the cylindrical body and the bottom cover; In the cavity, a flow guide baffle extends upward from the surface of the bottom cover to form a flow guide baffle. The side edge of the flow guide baffle contacts the inner wall of the cylinder, and the height of the end face of the flow guide baffle is lower than the height of the cylinder. The flow guide baffle divides the cavity into a flow guide cavity and a heat dissipation cavity. The cylinder is provided with a liquid inlet hole communicating with the flow guide cavity, and the bottom cover is provided with a liquid outlet hole communicating with the heat dissipation cavity. The cover is installed on the back of the contact plate, and the multiple heat dissipation groups are located in the heat dissipation cavity; the flow guiding cavity and the heat dissipation cavity are connected based on the gap between the end face of the flow guiding baffle and the back of the contact plate, and with the back of the contact plate as a reference, the height of the heat dissipation fins is higher than the gap; In each of the heat dissipation groups, a micro heat dissipation channel is formed between two adjacent heat dissipation fins, and the inlet of the micro heat dissipation channel faces the flow guide baffle.

[0006] In an optional embodiment, an outer edge positioning groove is provided on the back side of the contact plate along a closed path, and the heat dissipation fins are surrounded within the outer edge positioning groove; When the cover is installed on the back of the contact plate, the cylinder falls into the outer edge positioning groove.

[0007] In an optional embodiment, a positioning groove is provided on the back side of the contact plate in the heat dissipation cavity, and a positioning protrusion is provided on the bottom cover in the heat dissipation cavity. When the cover is installed on the back of the contact plate, the positioning protrusion engages in the positioning groove.

[0008] In an optional embodiment, the surface of the flow guide baffle that contacts the flow guide cavity is a flow guide surface, the root thickness of the flow guide baffle is greater than the end thickness of the flow guide baffle, and the flow guide surface is inclined to the bottom cover.

[0009] In an optional implementation, the guide surface and the inner wall of the cylinder are connected by an arc transition.

[0010] An optional implementation may also include an auxiliary heat sink; The auxiliary heat dissipation plate includes a plate body, which is fixed to the end face of the heat dissipation fins.

[0011] In an optional embodiment, the auxiliary heat dissipation plate is provided with insert fins, and when the plate is fixed to the end face of the heat dissipation fins, each insert fin extends into the corresponding micro heat dissipation channel.

[0012] In an optional implementation, when each of the inserted fins extends into the corresponding micro heat dissipation channel, the inserted fin contacts the two heat dissipation fins corresponding to the micro heat dissipation channel.

[0013] In an optional embodiment, the contact plate is provided with an external locking mechanism outside the covering area of ​​the cover; The contact plate is fixed to a preset external object by the external locking mechanism.

[0014] Accordingly, this utility model provides a liquid-cooled radiator, including a radiator, a circulation pump, a cooling fan, and the aforementioned cold block; The radiator has an inlet port and an outlet port. The inlet port and the outlet port are connected by a first pipe, and the outlet port and the inlet port are connected by a second pipe. The cold head, the first pipe, the radiator and the second pipe form a coolant circulation loop. The circulation pump is installed in the coolant circulation loop according to a preset method, and the cooling fan is fixed on the radiator.

[0015] In summary, this utility model embodiment provides a cold head and liquid-cooled radiator. Through the controllable gap between the guide baffle and the back of the contact plate, a jet effect is formed, allowing the coolant to enter the micro heat dissipation channel at a high speed and uniformly. This fully utilizes the heat transfer enhancement mechanism of the cooling inlet section to improve the heat dissipation effect of the cold head. The heat dissipation fins are obtained by planing with shovel teeth, which can obtain heat dissipation fins with a large aspect ratio and a small pitch, providing sufficient surface area for the contact of the coolant and enhancing the heat dissipation effect of the cold head. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the cold head according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the cold head structure according to an embodiment of the present invention.

[0019] Figure 3 This is a three-dimensional structural diagram of the cover body according to an embodiment of the present utility model.

[0020] Figure 4 This is a schematic diagram of the back structure of the contact plate in an embodiment of the present invention.

[0021] Figure 5 This is a schematic cross-sectional view of a cold head with an auxiliary heat dissipation plate according to an embodiment of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the liquid-cooled radiator according to an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Figure 1 This is a three-dimensional structural diagram of the cold head according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the cross-sectional structure of the cold head according to an embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of the cover body according to an embodiment of the present utility model. Figure 4 This is a schematic diagram of the back structure of the contact plate in an embodiment of the present invention.

[0025] This utility model embodiment provides a cold head, including a contact plate 2 and a cover 1; The front of the contact plate 2 is a heat dissipation contact surface, and multiple heat dissipation groups are provided on the back of the contact plate 2. Each heat dissipation group includes multiple heat dissipation fins 22 arranged in an array. The cover 1 includes a cylindrical body 13 and a bottom cover 14 disposed on an opening on one side of the cylindrical body 13, and a cavity is formed between the cylindrical body 13 and the bottom cover 14. In the cavity, a flow guide baffle 13 extends upward from the surface of the bottom cover 14. The side edge of the flow guide baffle 13 contacts the inner wall of the cylinder 13, and the height of the end face of the flow guide baffle 13 is lower than the height of the cylinder 13. The flow guide baffle 13 divides the cavity into a flow guide cavity and a heat dissipation cavity. The cylinder 13 is provided with a liquid inlet hole 11 communicating with the flow guide cavity, and the bottom cover 14 is provided with a liquid outlet hole 12 communicating with the heat dissipation cavity. The cover 1 is installed on the back of the contact plate 2, and the multiple heat dissipation groups are located in the heat dissipation cavity; the flow guiding cavity and the heat dissipation cavity are connected based on the gap 15 between the end face of the flow guiding baffle 13 and the back of the contact plate 2, and with the back of the contact plate 2 as a reference, the height of the heat dissipation fins 22 is higher than the gap 15. In each of the heat dissipation groups, a micro heat dissipation channel 25 is formed between two adjacent heat dissipation fins 22, and the inlet of the micro heat dissipation channel 25 faces the flow guide baffle 13.

[0026] The following provides a further description of the structure of each component involved in the cold head of this utility model embodiment.

[0027] Contact plate 2 Specifically, in this embodiment of the invention, the front of the contact plate 2 is a heat dissipation contact surface, used for direct contact with the surface of the heat source. In practical applications, the process design is based on the condition of the heat source surface. For example, mirror polishing can be used to improve the surface roughness of the heat dissipation contact surface and ensure the adhesion performance to the heat source surface; multiple contact points can also be added locally (as shown in the diagram), and thermal conductive agent can be used to fill the gaps, ensuring both heat dissipation performance and the adhesion of the contact surface.

[0028] The back of the contact plate 2 is machined with multiple heat dissipation groups in a planing-like manner using precision chisels. Each heat dissipation group consists of multiple parallel heat dissipation fins 22 with a thickness between 0.15 and 0.35 mm, a height between 3 and 10 mm, a pitch between 0.3 and 0.8 mm, and a height-to-thickness ratio exceeding 10. Micro heat dissipation channels 25 are naturally formed between adjacent fins with a hydraulic diameter of 0.2 and 0.6 mm. This level of precision is difficult to achieve with traditional CNC machining or aluminum extrusion.

[0029] In actual processing, in order to position the cover 1 and ensure sealing, an outer edge positioning groove 23 is machined on the outer edge of the back side of the contact plate 2, which is recessed by 0.5 to 1.2 mm along a closed path (rectangular, circular or chamfered rectangular). The groove width and the wall thickness of the cylinder 13 form a gap 15 of 0.05–0.1 mm to fit together.

[0030] In addition, in order to ensure the support of the central area and prevent the cover 1 from being deformed under external force, a conical or square positioning groove 24 is machined in the heat dissipation cavity area to precisely match the positioning protrusion 15 on the cover 1, thus realizing both the positioning function and the support function.

[0031] In addition, the contact plate 2 is provided with an external locking mechanism 21 outside the covering area of ​​the cover 1; The contact plate 2 is fixed to a preset external object by the external locking mechanism 21.

[0032] The external locking mechanism 21 used in this embodiment of the utility model is a locking screw with a spring.

[0033] Cover 1 The cover 1 of this utility model embodiment is composed of a cylindrical body 13 and a bottom cover 14. In practical applications, it can be integrally processed or vacuum brazed from copper, aluminum alloy or stainless steel.

[0034] Specifically, one side of the cylinder 13 has an opening for guiding the outer edge positioning groove 23; The outer side of the bottom cover 14 is provided with a drain hole 12 of M42×1.5 size or G1 / 4 standard thread, and the inner side (facing the contact plate 2) is provided with a flow guide baffle 13.

[0035] The flow guide baffle 13 extends integrally from the surface of the bottom cover 14, and its height is lower than that of the cylinder 13. In actual design, it can be 70% to 85% of the height of the cylinder 13. The end face of the flow guide baffle 13 is machined by flying cutting to a surface roughness Rz of less than or equal to 1.6μm, so as to form a uniform and controllable gap 15 with the back of the contact plate 2. This gap 15 constitutes a throttling orifice, which increases the flow rate of the coolant.

[0036] The flow guide baffle 13 divides the cavity into a flow guide cavity (connected to the liquid inlet 11) and a heat dissipation cavity (connected to the liquid outlet 12). The two cavities are connected only through the aforementioned gap 15 to minimize the generation of short-circuit flow.

[0037] Specifically, in order to reduce the flow resistance of the coolant, the guide baffle 13 faces the side of the guide cavity as the guide surface 14. The guide surface 14 has an inclined design structure. Correspondingly, the thickness at the root of the guide baffle 13 is greater than the thickness at the end, and the guide surface 14 has an inclination angle of 5° to 15°. In addition, the guide baffle 13 and the cylinder 13 are connected by an arc surface transition, which reduces the local resistance coefficient by more than 10%.

[0038] Matching the contact plate 2, the bottom cover 14 has a positioning protrusion 15 on the heat dissipation cavity side that corresponds to the positioning groove 24 of the contact plate 2.

[0039] In actual use, considering the heat dissipation effect of the water circuit, the liquid inlet hole 11 and the liquid outlet hole 12 adopt an orthogonal design structure, and the liquid outlet hole 12 needs to be as close as possible to the flow guide baffle 13.

[0040] In practical applications, the cold head of this utility model embodiment, in conjunction with the accompanying drawings, demonstrates its practical application. Figure 2 The schematic diagram of the first water path s1 shows that when the coolant enters the guide cavity from the inlet hole 11, it moves to the gap 15 under the guidance of the guide baffle. The gap 15 throttles the inlet hole 11, increasing the flow rate of the coolant. The high-speed coolant is sprayed out from the gap 15 into the heat dissipation cavity, first dissipating heat at the root of the heat dissipation fins 22 (the root is generally the position with the highest temperature of the heat dissipation fins 22, and dissipating heat at the root first is beneficial to improving heat exchange efficiency). As the high-speed coolant enters the heat dissipation cavity, with the consumption of kinetic energy, the coolant, which loses horizontal kinetic energy, will move upward towards the drain hole 12 under pressure. During this movement, the coolant will gradually come into contact with other positions of the heat dissipation fins 22 except for the root, carrying away the heat on the heat dissipation fins 22.

[0041] It should be noted that the attached diagram... Figure 2 The schematic first water path trajectory s1 is only a schematic diagram of the trajectory of a portion of the coolant. In actual applications, the spray distance (horizontal movement distance) of some coolant is much greater, reaching the rear end of the heat dissipation fins 22.

[0042] Figure 5 A schematic cross-sectional view of a cold head with an auxiliary heat dissipation plate according to an embodiment of the present invention is shown.

[0043] Furthermore, in practical applications, the heat dissipation dead zone of the aforementioned cold head structure is located in Figure 2In the T1 region of the structure shown, on the one hand, the amount of coolant that can reach the very end of the heat dissipation fins 22 is relatively small, and on the other hand, the coolant at the very end of the heat dissipation fins hardly passes through the T1 region when it flows back, which leads to the formation of a heat dissipation dead zone.

[0044] Therefore, in actual design, in order to change the heat dissipation dead zone, the cold head also includes an auxiliary heat dissipation plate based on the aforementioned cold head; the auxiliary heat dissipation plate includes a plate body 31, which is fixed to the end face of the heat dissipation fins 22; the first end face of the plate body 31 is attached to the flow guide baffle 13, the two sides of the plate body 31 are attached to the inner wall of the cylinder 13, and the end of the plate body 31 forms a flow guide channel between the end of the plate body 31 and the inner wall of the cylinder 13.

[0045] Refer to the attached diagram. Figure 5 The schematic second water path s2, under the constraint of plate 31, allows the coolant to flow only through the fins, reach the flow channel, and then through the interlayer space between plate 31 and the base plate to the drain hole 12. The structure of plate 31 ensures that the coolant can flow to the rear end of the heat dissipation fins 22, avoiding the formation of a heat dissipation dead zone T1.

[0046] Refer to the attached diagram. Figure 5 The heat dissipation dead zone T2 is shown in the diagram. Correspondingly, after the plate 31 is installed, the heat dissipation dead zone changes from T1 to T2. In practical applications, since the heat dissipation dead zone T2 is located on the side of the inlet of the coolant entering the heat dissipation cavity, the high-speed and low-temperature coolant can quickly remove the heat from the fin roots in the T2 area. Therefore, the heat dissipation dead zone T2 has less heat retention and accumulation compared to T1. It can be seen that the auxiliary heat dissipation plate can change the heat dissipation dead zone and improve the overall heat dissipation efficiency of the cold head.

[0047] Furthermore, in addition to controlling the flow trajectory of the coolant, the auxiliary heat sink also has insert fins. Since the coolant flows through both the front and back of the plate 31, the auxiliary heat sink is equipped with insert fins. When the plate 31 is fixed to the end face of the heat sink fins 22, each insert fin extends into the corresponding micro heat dissipation channel 25, which can increase the contact area between the auxiliary heat sink and the coolant.

[0048] Based on this, when each of the inserted fins extends into the corresponding micro-heat dissipation channel 25, the inserted fin contacts the two heat dissipation fins 22 corresponding to the micro-heat dissipation channel 25. On one hand, the inserted fin can contact the upper end of the heat dissipation fin 22, conducting the heat of the heat dissipation fin 22 to the inserted fin, and finally transferring it to the plate 31. When the coolant flows through the interlayer space between the plate 31 and the bottom plate to the drain hole 12, it can dissipate heat on the top surface of the plate 31 in the illustrated direction.

[0049] Specifically, the processing method for inserting fins on plate 31 is the same as that for heat dissipation fins 22. In actual processing, the thickness and pitch of heat dissipation fins 22 can be set to the same value, and the thickness and pitch of the inserted fins can also be set to the same value. Through this implementation method, when the inserted fins are inserted into the micro heat dissipation channel 25, they can be guaranteed to fit with the corresponding heat dissipation fins 22.

[0050] In addition, considering the fixation of the plate 31, the positioning protrusion 15 on the cover 1 can be set as a two-section structure (step structure). The end of the positioning protrusion 15 is used to cooperate with the contact plate 2 for positioning. The transition step of the two-section structure of the positioning protrusion 15 is used to press the plate 31 onto the heat dissipation fins 22.

[0051] Furthermore, auxiliary fins 32 can be added to the side of the plate 31 facing the base plate to increase the contact surface area between the coolant and the plate 31 during the recirculation process, thereby improving the heat dissipation capacity of the cold head.

[0052] Figure 6 This is a three-dimensional structural diagram of the liquid-cooled radiator according to an embodiment of the present invention.

[0053] Accordingly, this utility model also provides a liquid-cooled radiator, including a radiator, a circulation pump, a cooling fan, and the aforementioned cold block; The radiator has an inlet port and an outlet port. The inlet port and the drain port 12 are connected by a first pipe, and the outlet port and the inlet port 11 are connected by a second pipe. The cold head, the first pipe, the radiator and the second pipe form a coolant circulation loop, and the circulation pump is set in the coolant circulation loop according to a preset method; specifically, the circulation pump can be set as an AIO integrated structure with the cold head, or it can be set as an independent physical structure in the coolant circulation loop. Its specific structure is not shown in this embodiment of the utility model. The cooling fan is fixed to the radiator.

[0054] In summary, this utility model embodiment provides a cold head and liquid cooling radiator. Through the controllable gap 15 between the flow guide baffle 13 and the back of the contact plate 2, a jet effect is formed, allowing the coolant to enter the micro heat dissipation channel 25 at a high speed and uniformly. This fully utilizes the heat exchange enhancement mechanism of the cooling inlet section to improve the heat dissipation effect of the cold head. The heat dissipation fins 22 are obtained by planing with shaving teeth, which can obtain heat dissipation fins 22 with a large aspect ratio and a small pitch, which can provide sufficient surface area for the contact of the coolant and enhance the heat dissipation effect of the cold head.

[0055] The above provides a detailed description of a cold head and liquid cooling radiator provided by the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cold head, characterized in that, Including the contact plate and cover; The front of the contact plate is a heat dissipation contact surface, and multiple heat dissipation groups are provided on the back of the contact plate. Each heat dissipation group includes multiple heat dissipation fins arranged in an array. The cover includes a cylindrical body and a bottom cover disposed on an opening on one side of the cylindrical body, and a cavity is formed between the cylindrical body and the bottom cover; In the cavity, a flow guide baffle extends upward from the surface of the bottom cover to form a flow guide baffle. The side edge of the flow guide baffle contacts the inner wall of the cylinder, and the height of the end face of the flow guide baffle is lower than the height of the cylinder. The flow guide baffle divides the cavity into a flow guide cavity and a heat dissipation cavity. The cylinder is provided with a liquid inlet hole communicating with the flow guide cavity, and the bottom cover is provided with a liquid outlet hole communicating with the heat dissipation cavity. The cover is installed on the back of the contact plate, and the multiple heat dissipation groups are located in the heat dissipation cavity; The flow guiding cavity and the heat dissipation cavity are connected by the gap between the end face of the flow guiding baffle and the back side of the contact plate. With the back side of the contact plate as a reference, the height of the heat dissipation fins is higher than the gap. In each of the heat dissipation groups, a micro heat dissipation channel is formed between two adjacent heat dissipation fins, and the inlet of the micro heat dissipation channel faces the flow guide baffle.

2. The cold head as described in claim 1, characterized in that, The back of the contact plate is provided with an outer edge positioning groove arranged along a closed path, and the heat dissipation fins are surrounded in the outer edge positioning groove. When the cover is installed on the back of the contact plate, the cylinder falls into the outer edge positioning groove.

3. The cold head as described in claim 1, characterized in that, In the heat dissipation cavity, a positioning groove is provided on the back of the contact plate, and a positioning protrusion is provided on the bottom cover inside the heat dissipation cavity; When the cover is installed on the back of the contact plate, the positioning protrusion engages in the positioning groove.

4. The cold head as described in claim 1, characterized in that, The surface of the flow guide baffle that contacts the flow guide cavity is the flow guide surface. The thickness of the root of the flow guide baffle is greater than the thickness of the end of the flow guide baffle. The flow guide surface is inclined to the bottom cover.

5. The cold head as described in claim 4, characterized in that, The flow guide surface is connected to the inner wall of the cylinder through an arc transition.

6. The cold head as described in claim 1, characterized in that, It also includes an auxiliary heat sink; The auxiliary heat dissipation plate includes a plate body, which is fixed to the end face of the heat dissipation fins; the first end face of the plate body is attached to the flow guide baffle, the two sides of the plate body are attached to the inner wall of the cylinder, and the end of the plate body forms a flow guide channel with the inner wall of the cylinder.

7. The cold head as described in claim 6, characterized in that, The auxiliary heat dissipation plate is provided with insert fins. When the plate is fixed to the end face of the heat dissipation fins, each insert fin extends into the corresponding micro heat dissipation channel.

8. The cold head as described in claim 7, characterized in that, When each of the inserted fins extends into the corresponding micro heat dissipation channel, the inserted fin contacts the two heat dissipation fins corresponding to the micro heat dissipation channel.

9. The cold head as described in claim 1, characterized in that, The contact plate is provided with an external locking mechanism outside the covering area of ​​the cover; The contact plate is fixed to a preset external object by the external locking mechanism.

10. A liquid-cooled heat sink, characterized in that, Includes a radiator, a circulation pump, a cooling fan, and a cold block as described in any one of claims 1 to 9; The radiator has an inlet port and an outlet port. The inlet port and the outlet port are connected by a first pipe, and the outlet port and the inlet port are connected by a second pipe. The cold head, the first pipe, the radiator and the second pipe form a coolant circulation loop. The circulation pump is installed in the coolant circulation loop according to a preset method, and the cooling fan is fixed on the radiator.

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