TWI817698B - Two-phase immersion-cooling heat-dissipation structure having acute angle notch - Google Patents

Abstract

A two-phase immersion-cooling heat-dissipation structure having an acute angle notch is provided. The structure includes a substrate and a plurality of fins. The substrate has opposite fin and non-fin surfaces. The non-fin surface is used for contacting the heat source immersed in the two-phase coolant, and the fin surface is connected with the fins. At least half of the fins are functional fins. At least one side of the functional fin defines a first surface and a second surface. The included angle between the first surface and the fin surface is between 80 and 100 degrees, and the included angle between the second surface and the fin surface is less than 75 degrees, so that an acute angle notch is formed between the second surface and the fin surface to generate a thermal hotspot for bubble generation.

Description

Two-phase immersed heat dissipation structure with acute-angle notch structure

The present invention relates to a heat dissipation structure, specifically to a two-phase immersed heat dissipation structure with an acute-angle notch structure.

Immersion cooling technology directly immerses heating components (such as servers, disk arrays, etc.) in non-conductive cooling liquid, so that the cooling liquid absorbs heat and vaporizes to take away the heat energy generated by the operation of the heating components. However, how to dissipate heat more effectively through immersion cooling technology has always been a problem that the industry needs to solve.

In view of this, the inventor has been engaged in the development and design of related products for many years. He felt that the above deficiencies could be improved, so he devoted himself to research and applied academic theories, and finally proposed an invention that is reasonably designed and effectively improves the above deficiencies.

The technical problem to be solved by the present invention is to provide a two-phase immersed heat dissipation structure with an acute-angle notch structure in view of the shortcomings of the existing technology.

An embodiment of the present invention discloses a two-phase immersed heat dissipation structure with an acute-angle notch structure, which includes a heat dissipation base and a plurality of fins. The heat dissipation base has opposite fin surfaces and non-fin surfaces. The non-fin surfaces The fin surface is used to form contact with the heat source immersed in the two-phase cooling liquid. The fin surface is connected with the plurality of fins, and at least half of the plurality of fins are functional fins. The functional fins At least one side of the fin defines a connected first surface and a second surface. The angle between the first surface and the fin surface is between 80 degrees and 100 degrees. The angle between the second surface and the fin surface is is less than 75 degrees, so that an acute-angled notch structure is formed between the second surface and the fin surface to generate a hot spot that is conducive to bubble generation.

In a preferred embodiment, the angle between the second surface and the fin surface is further less than 60 degrees.

In a preferred embodiment, the functional fins are made of one of copper, copper alloy, and aluminum alloy.

In a preferred embodiment, the functional fins are either pin-shaped fins or plate-shaped fins.

In a preferred embodiment, the acute-angle notch structure formed between the second surface and the fin surface is formed by chemically etching the bottom of the functional fin.

In a preferred embodiment, the acute-angle notch structure formed between the second surface and the fin surface is formed by forging, extruding or bending the bottom of the functional fin through local processing. formed.

In a preferred embodiment, the projected width of the second surface onto the top surface of the functional fin is at least one sixth of the width of the top surface of the functional fin.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and illustration and are not used to limit the present invention.

The following is a description of the relevant implementation modes disclosed in the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as is stated in advance. In addition, the same or similar parts in the drawings are labeled with the same reference numerals. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of the present invention. In addition, the term "or" used in this article shall include any one or combination of more of the associated listed items depending on the actual situation.

[First Embodiment]

Please refer to FIG. 1 to FIG. 2 , which is a first embodiment of the present invention. The embodiment of the present invention provides a two-phase immersed heat dissipation structure with an acute-angle notch structure for contacting a device immersed in a two-phase cooling liquid. heat source. As shown in FIG. 1 , a two-phase immersed heat dissipation structure with an acute-angle notch structure provided according to an embodiment of the present invention includes a heat dissipation base 10 and a plurality of fins 20 .

In this embodiment, the heat dissipation substrate 10 can be made of a material with high thermal conductivity, such as aluminum, copper or alloys thereof. The heat dissipation substrate 10 may be a non-porous heat dissipation plate or a porous heat dissipation plate. Preferably, the heat dissipation substrate 10 can be a porous heat dissipation plate immersed in the two-phase cooling liquid 900 (such as electronic fluoride liquid) with a porosity greater than 8%, which is used to increase the generation of bubbles and enhance the immersion heat dissipation effect. .

In this embodiment, the heat dissipation substrate 10 has opposite fin surfaces 101 and non-fin surfaces 102 . The non-fin surface 102 of the heat dissipation substrate 10 is used to form contact with the heat source 800 immersed in the two-phase cooling liquid 900. This contact may be a direct contact or an indirect contact through an interlayer. A plurality of fins 20 are connected to the fin surface 101 of the heat dissipation base 10, and the heat dissipation base 10 and the fins 20 can be integrated by metal injection molding (MIM) or skiving process. Ground connection or welding connection. Furthermore, the fins 20 may be pin fins or plate fins, and may be made of copper, copper alloy or aluminum alloy.

In this embodiment, at least half of the plurality of fins 20 are functional fins 20a, and they can be located directly above the heat source 800 or at a position corresponding to the heat source 800. Moreover, one side of the functional fin 20a defines a connected first surface 201 and a second surface 202. The angle between the first surface 201 and the fin surface 101 is between 80 degrees and 100 degrees. The surface 101 is substantially vertical, and the angle between the second surface 202 and the fin surface 101 is less than 75 degrees, preferably less than 60 degrees, so that an acute-angled notch structure C is formed between the second surface 202 and the fin surface 101 to create Hot spots that are conducive to bubble generation. Therefore, compared with vertical fins whose side surfaces are perpendicular to the fin surface, an acute-angled notch structure C is formed between the second surface 202 of the side surface and the fin surface 101 in this embodiment, thereby making the heat source 800 The heat transfer path (indicated by the arrow in Figure 2) is restricted, thereby generating local high temperature at the sharp corner (indicated by the hot spot t in Figure 2). Therefore, this embodiment is not only beneficial to bubbles because of the local high temperature Generation, also because the sharp-angled notch structure can increase the contact area and facilitate bubble generation.

In this embodiment, the opposite side of the functional fin 20a also defines a connected first surface 201 and a second surface 202. The angle between the first surface 201 and the fin surface 101 is between 80 degrees and 100 degrees. The angle between the two surfaces 202 and the fin surface 101 is less than 75 degrees, so that the second surface 202 on the opposite side of the functional fin 20a and the fin surface 101 jointly form an acute-angle notch structure C.

Therefore, in this embodiment, an acute-angled notch structure C is formed between the second surface 202 of the two opposite sides of the functional fin 20a and the fin surface 101 respectively, which further increases the generation and contact area of local high-temperature spots and is more conducive to bubble generation.

Furthermore, the acute-angled notch structure C formed between the second surface 202 of the side surface and the fin surface 101 in this embodiment may be formed by chemical etching. Furthermore, the acute-angle notch structure C may be formed by chemically etching the bottom of the functional fin 20a with chemicals, and may be chemically etched by a phosphoric acid-based microetchant, a sulfuric acid-based microetchant or a ferric chloride etchant. formed to increase roughness and facilitate bubble generation.

[Second Embodiment]

Please refer to Figure 3, which is a second embodiment of the present invention. This embodiment is substantially the same as the first embodiment, and the differences are explained as follows.

In this embodiment, the acute-angled notch structure C formed between the second surface 202 and the fin surface 101 of the side surface of the functional fin 20b in the plurality of fins 20 may be due to incomplete chemical corrosion, causing the second The surface 202 and the fin surface 101 are incompletely connected. It can also be said that the acute-angled notch structure C formed between the second surface 202 and the fin surface 101 has an incomplete sharp angle. Although the incomplete sharp angle may cause a slight decrease in the effect, But it also has the effect of creating local high temperature spots. Furthermore, the projection width W1 of the second surface 202 projected onto the top surface of the functional fin 20b needs to be at least one-sixth of the width W of the top surface of the functional fin 20b, in order to make the effect more significant.

[Third Embodiment]

Please refer to Figure 4, which is a third embodiment of the present invention. This embodiment is substantially the same as the first embodiment, and the differences are explained as follows.

In this embodiment, the functional fin 20c among the plurality of fins 20 only has an acute-angled notch structure C formed between the second surface 202 and the fin surface 101 on one side. Furthermore, the acute-angled notch structure C formed between the second surface 202 and the fin surface 101 of one side of this embodiment may be formed by local processing. Furthermore, the acute-angle notch structure C may be formed by forging, extruding or bending the bottom of the functional fin 20c.

Based on the above, the two-phase immersed heat dissipation structure with an acute-angle notch structure provided by the present invention can at least pass through the "heat dissipation base", "multiple fins", and "the heat dissipation base has opposite fin surfaces and non-fin surfaces. , the non-fin surface is used to make contact with the heat source immersed in the two-phase coolant, and the fin surface is connected with the plurality of fins. "At least half of the plurality of fins are functional fins, and the functional fins At least one side of the fin defines a connected first surface and a second surface. The angle between the first surface and the fin surface is between 80 degrees and 100 degrees. The angle between the second surface and the fin surface is less than 75 degrees, so that the angle between the second surface and the fin surface is less than 75 degrees. The technical solution of "a sharp-angled notch structure formed between the surfaces to create hot spots that are conducive to bubble generation" can effectively enhance the overall immersion heat dissipation effect.

The contents disclosed above are only preferred and feasible embodiments of the present invention, and do not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

10:Heat dissipation base 101: Fin surface 102:Non-fin side 20:fins 20a, 20b, 20c: Functional fins 201: First side 202:Second side W: Top width W1: projection width C: Acute-angled notch structure t: hot spot 800:Heat source 900: Two-phase coolant

Figure 1 is a schematic side view of the structure of the first embodiment of the present invention.

FIG. 2 is a schematic diagram of the heat transfer path of the heat source according to the first embodiment of the present invention.

Figure 3 is a schematic side view of the structure of the second embodiment of the present invention.

Figure 4 is a schematic side view of the structure of the third embodiment of the present invention.

10:Heat dissipation base

101: Fin surface

102:Non-fin side

20:fins

20a: Functional fins

201: First side

202:Second side

C: Acute-angled notch structure

800:Heat source

900: Two-phase coolant

Claims (6)

A two-phase immersed heat dissipation structure with an acute-angle notch structure, which includes a heat dissipation base and a plurality of fins. The heat dissipation base has opposite fin surfaces and non-fin surfaces, and the non-fin surfaces are used to be immersed in the The heat source of the two-phase coolant is in contact, the fin surface is connected to the plurality of fins, and at least half of the plurality of fins are functional fins, and at least one side of the functional fins Define a connected first surface and a second surface, the angle between the first surface and the fin surface is between 80 degrees and 100 degrees, and the angle between the second surface and the fin surface is less than 75 degrees, so that An acute-angled notch structure is formed between the second surface and the fin surface to create a hot spot that is conducive to bubble generation; wherein the projected width of the second surface onto the top surface of the functional fin is at least One-sixth the width of the top surface of the functional fin. The two-phase immersed heat dissipation structure with an acute-angle notch structure as claimed in claim 1, wherein the angle between the second surface and the fin surface is further less than 60 degrees. The two-phase immersed heat dissipation structure with an acute-angle notch structure as claimed in claim 1, wherein the functional fins are made of one of copper, copper alloy, and aluminum alloy. The two-phase immersed heat dissipation structure with an acute-angle notch structure as claimed in claim 1, wherein the functional fins are either pin-cylindrical fins or plate-shaped fins. The two-phase immersed heat dissipation structure with an acute-angle notch structure as claimed in claim 1, wherein the acute-angle notch structure jointly formed between the second surface and the fin surface is formed by chemical etching. The functional fins are formed by chemical etching at the bottom. The two-phase immersed heat dissipation structure with an acute-angle notch structure as claimed in claim 1, wherein the acute-angle notch structure jointly formed between the second surface and the fin surface is made by local processing. The bottom of the functional fins is formed by forging, extruding or bending.

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