Folding fin phase change radiator based on porous structure

Abstract

The utility model relates to the technical field of radiators, in particular to a folding fin phase change radiator based on a porous structure, which comprises a substrate, folding fins are welded on the outer surface of the substrate, the porous structure is arranged in the substrate, and liquid refrigerant is filled in the porous structure. The porous structure comprises a plurality of flow channels which are distributed at equal intervals, porous holes which are vertically distributed at equal intervals are formed in the flow channels, the head ends and the tail ends of the flow channels are communicated through flow dividing channels, one ends of the flow dividing channels are sealed in the base plate, and the other ends of the flow dividing channels are communicated with the outside along the side wall of the base plate; according to the folding fin phase change radiator based on the porous structure, the porous structure makes contact with a liquid refrigerant, the surface heat transfer coefficient can be increased by multiple times, bubble state boiling can be achieved under the small boiling temperature difference, meanwhile, film state boiling can be avoided, and the problem that the heat transfer capacity of the phase change radiator can be reduced due to the film state boiling is solved; and stability and high efficiency can be kept in long-term operation.

Description

Technical Field

[0001] The utility model relates to the technical field of radiators, in particular to a folded fin phase change radiator based on a porous structure. Background Art

[0002] With the rapid development of server computing power, such as artificial intelligence, phase change heat sinks are widely used. Compared with traditional air-cooled heat sinks, they have higher heat transfer capabilities due to direct contact with the heated component. Existing phase change heat sinks generally rely on the phase change of the phase change medium to achieve cooling and heat dissipation. However, due to the limited contact area between the phase change medium and the thermally conductive material, the surface heat transfer coefficient is low, and higher temperatures are required to achieve phase changes, such as from liquid to gas. Film boiling is also prone to occur, which reduces the heat transfer capacity of the phase change heat sink. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the present invention provides a folded fin phase change heat sink based on a porous structure, which solves the technical problems that the existing phase change heat sink needs to achieve phase change at a higher temperature and is prone to film boiling.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a folded fin phase change heat sink based on a porous structure, comprising a substrate, the outer surface of which is welded with folded fins, and an interior of the substrate is provided with a porous structure filled with liquid refrigerant;

[0005] The porous structure includes multiple equidistantly distributed flow channels, each of which is provided with vertically equidistantly arranged porous holes. The head and tail ends of the multiple flow channels are connected through a diversion channel, one end of which is enclosed in the substrate and the other end is connected to the outside along the side wall of the substrate.

[0006] Preferably, a pipe head welded to the other end of the diversion channel is provided on the side wall of the substrate close to the diversion channel, and a pipe plug is threadedly connected to the pipe head.

[0007] Preferably, mounting holes are provided on the surface of the base plate near the four corners.

[0008] Preferably, the inner wall of the flow channel is provided with a capillary layer.

[0009] Preferably, the porous holes are located on a side of the flow channel close to the folded fin.

[0010] Preferably, the porous structure has a thickness of 0.2 mm to 0.5 mm, a porosity of 45% to 55%, and a pore size of 0.01 mm to 0.1 mm.

[0011] By means of the above technical solution, the present invention provides a folded fin phase change heat sink based on a porous structure, which has at least the following beneficial effects:

[0012] 1. The folded fin phase change radiator based on the porous structure can increase the surface heat transfer coefficient many times by contacting the porous structure with the liquid refrigerant, and can realize bubble boiling under a very small boiling temperature difference. It has good anti-scaling performance and can avoid the occurrence of film boiling. It avoids the problem that film boiling will reduce the heat transfer capacity of the phase change radiator, and can maintain stability and high efficiency in long-term operation.

[0013] 2. The folded fin phase change radiator based on the porous structure can enhance the heat exchange intensity and efficiency of the liquid refrigerant by setting a capillary layer.

[0014] 3. The folded fin phase change radiator based on the porous structure is provided with a tube head and a tube plug. After removing the tube plug, liquefied refrigerant can be injected into the tube head, thereby avoiding the problem of reduced thermal conductivity due to reduced evaporation of the liquefied refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0017] Figure 2 This is a schematic structural diagram of a partial cross-section of the substrate of the utility model;

[0018] Figure 3 This is a schematic structural diagram of the substrate of the utility model from the front;

[0019] Reference numerals:

[0020] 1. Substrate; 101. Mounting hole; 102. Porous structure; 1021. Flow channel; 1022. Porous holes; 1023. Diversion channel; 1024. Capillary layer; 2. Folded fin; 3. Tube head; 4. Tube plug. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Phase change heat sinks (PCSs) are heat dissipation devices that utilize phase change materials for thermal management. Phase change materials can absorb or release large amounts of heat when changing their phase (e.g., from solid to liquid or vice versa), making them very effective in controlling and managing heat.

[0023] Example 1:

[0024] Based on the technical defects of the existing technology that phase change can only be achieved at a higher temperature and film boiling is prone to occur, please refer to Figure 1-Figure 3 The utility model provides a folded fin phase change radiator based on a porous structure. By contacting the porous structure 102 with the liquid refrigerant, the surface heat transfer coefficient can be increased many times, and bubble boiling can be achieved under a very small boiling temperature difference, with good anti-scaling performance. At the same time, the occurrence of film boiling can be avoided, and the problem that film boiling will reduce the heat transfer capacity of the phase change radiator can be avoided. It can maintain stability and high efficiency during long-term operation. The radiator includes a substrate 1, the outer surface of the substrate 1 is welded with folded fin fins 2, the interior of the substrate 1 is provided with a porous structure 102, and the porous structure 102 is filled with liquid refrigerant; the substrate 1 contacts the heating element and conducts heat to the liquid refrigerant in the porous structure 102. Due to the large contact area between the porous structure 102 and the liquid refrigerant, the liquid refrigerant can be quickly heated and evaporated, and then the folded fin fins 2 take away the heat on the liquid refrigerant, causing it to liquefy and turn back into liquid again, and this process is repeated to achieve efficient heat dissipation.

[0025] To improve heat transfer efficiency, please refer to Figure 2 The porous structure 102 includes a plurality of equally spaced flow channels 1021, and the flow channels 1021 are provided with vertically equidistantly arranged porous holes 1022, and the head ends and the tail ends of the plurality of flow channels 1021 are connected through a diversion channel 1023, one end of the diversion channel 1023 is enclosed in the substrate 1, and the other end is connected to the outside along the side wall of the substrate 1; the liquid refrigerant is connected with each other under the action of the flow channel 1021 and the diversion channel 1023, so the liquid refrigerant can fill the entire porous structure 102, and under the action of the porous holes 1022, the contact area between the inner wall of the substrate 1 and the liquid refrigerant can be increased, thereby achieving the purpose of improving the heat conduction efficiency.

[0026] To facilitate the addition of liquid refrigerant, a pipe head 3 welded to the other end of the diversion channel 1023 is provided on the side wall of the substrate 1 near the diversion channel 1023, and a pipe plug 4 is threadedly connected to the pipe head 3; after removing the pipe plug 4, liquefied refrigerant can be injected into the pipe head 3, thereby avoiding the problem of decreased thermal conductivity due to reduced evaporation of the liquefied refrigerant.

[0027] To facilitate installation of the radiator, mounting holes 101 are provided on the surface of the substrate 1 near the four corners; the substrate 1 can be mounted to the position of the heating element by screws, etc., so as to achieve heat dissipation for the heating element.

[0028] In order to improve the uniformity of the distribution of the liquid refrigerant, a capillary layer 1024 is provided on the inner wall of the flow channel 1021; through the capillary action of the capillary layer 1024, on the one hand, the liquefied liquid can be quickly returned to the heat conduction section, and at the same time, the liquid refrigerant can be distributed more evenly.

[0029] In order to quickly dissipate heat through the folded fin 2, the porous holes 1022 are located on the side of the flow channel 1021 close to the folded fin 2; the evaporated gaseous heat is higher, and the side of the folded fin 2 can better transfer heat.

[0030] In order to improve the heat exchange efficiency of the substrate 1 , the thickness of the porous structure 102 is set to 0.2 mm to 0.5 mm, the porosity is set to 45% to 55%, and the pore diameter is set to 0.01 mm to 0.1 mm.

[0031] It can be seen from the above embodiments that: the substrate 1 contacts the heating element and conducts heat to the liquid refrigerant in the porous structure 102, and the liquid refrigerant is interconnected under the action of the flow channel 1021 and the diversion channel 1023, so the liquid refrigerant can fill the entire porous structure 102. Since the contact area between the porous structure 102 and the liquid refrigerant is large, the liquid refrigerant can be quickly heated and evaporated, and then the folded fin 2 takes away the heat from the liquid refrigerant, causing it to liquefy and return to liquid again. This process is repeated to achieve efficient heat dissipation.

[0032] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0033] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A folded fin phase change heat sink based on a porous structure, comprising a substrate (1), characterized in that: The outer surface of the base plate (1) is welded with folded fins (2), the interior of the base plate (1) is provided with a porous structure (102), and the porous structure (102) is filled with liquid refrigerant; The porous structure (102) comprises a plurality of equally spaced flow channels (1021), each of which is provided with vertically equally spaced porous holes (1022), and the head ends and tail ends of the plurality of flow channels (1021) are connected via a diversion channel (1023), one end of the diversion channel (1023) being enclosed within the substrate (1) and the other end being connected to the outside along the side wall of the substrate (1).

2. The folded fin phase change heat sink based on a porous structure according to claim 1, characterized in that: A pipe head (3) welded to the other end of the diversion channel (1023) is provided on the side wall of the base plate (1) close to the diversion channel (1023), and a pipe plug (4) is threadedly connected to the pipe head (3).

3. The folded fin phase change heat sink based on a porous structure according to claim 1, characterized in that: The surfaces of the base plate (1) near the four corners are each provided with mounting holes (101).

4. The folded fin phase change heat sink based on a porous structure according to claim 1, characterized in that: The inner wall of the flow channel (1021) is provided with a capillary layer (1024).

5. The folded fin phase change heat sink based on a porous structure according to claim 1, characterized in that: The porous hole (1022) is located on a side of the flow channel (1021) close to the folded fin (2).

6. The folded fin phase change heat sink based on a porous structure according to claim 1, characterized in that: The porous structure (102) has a thickness of 0.2 mm to 0.5 mm, a porosity of 45% to 55%, and a pore size of 0.01 mm to 0.1 mm.

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