Radiator and radiating fins thereof

Abstract

The present invention discloses a heat dissipation fin, comprising a longitudinal beam connected to the surface of a heat dissipation substrate and used to absorb the heat thereof, at least two heat dissipation vertical plates arranged on the longitudinal beam and interlocked with each other to form a closed cavity, and a plurality of condensation plates distributed along the vertical layers on the inner wall surface of at least one of the heat dissipation vertical plates, the closed cavity is filled with a phase change refrigerant, and each of the condensation plates is at a preset angle to the horizontal plane, so that the phase change refrigerant moves along the surface of the condensation plate to the longitudinal beam under the action of gravity after condensation. In this way, since the condensation plates are densely distributed along the height direction of the heat dissipation vertical plates, the phase change refrigerant can, after filling the closed cavity, simultaneously exchange heat with the heat dissipation substrate at different positions in the height direction of the heat dissipation vertical plates, thereby greatly improving the heat dissipation performance and reducing the heat dissipation cost. The present invention also discloses a radiator, and its beneficial effects are as described above.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation technology, and in particular to a heat dissipation fin. The present invention also relates to a radiator. Background Art

[0002] As the power of electronic devices continues to increase, electronic cooling technology has gradually become a bottleneck problem restricting the development of electronic technology. Especially for passive cooling, since there is no forced convection of external fans or pumps to enhance the heat exchange capacity, the heat dissipation capacity can usually only be improved by improving the radiator structure and the efficiency of the heat dissipation fins. Therefore, how to optimize the structure and develop high thermal conductivity and high efficiency heat dissipation fins has become an urgent problem to be solved in current engineering.

[0003] Effective ways to improve the efficiency of the radiator include: optimizing the spacing and structure of the fins to optimize the natural convection heat transfer effect; optimizing the fin material to enhance the thermal conductivity, making the temperature of the fins more uniform and improving the fin efficiency. The size of the radiator is often affected by many factors, so improving the thermal conductivity of the fins and increasing the fin efficiency have become the main directions of improvement.

[0004] In the prior art, a two-phase circulation is generally formed by relying on gravity reflux through a blowing plate. Since this solution adopts the form of gravity reflux, the thermal conductivity of the fins varies greatly along the vertical direction. The condensed refrigerant flows downward under the action of gravity, which results in the upper part of the fins not being wetted by the condensed refrigerant reflux, and phase change heat transfer cannot occur, and the heat dissipation capacity is greatly reduced.

[0005] Therefore, how to ensure that the heat dissipation fins can perform phase change heat dissipation at different positions in the height direction, improve the heat dissipation performance, and reduce the heat dissipation cost is a technical problem faced by those skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a heat dissipation fin that can perform phase change heat dissipation at different positions in the height direction, thereby improving heat dissipation performance and reducing heat dissipation costs. Another object of the present invention is to provide a heat sink.

[0007] In order to solve the above technical problems, the present invention provides a heat dissipation fin, comprising a longitudinal beam connected to the surface of a heat dissipation substrate and used to absorb its heat, at least two heat dissipation vertical plates arranged on the longitudinal beam and interlocked with each other to form a closed cavity, and a plurality of condensation plates distributed along the vertical layers on the inner wall surface of at least one of the heat dissipation vertical plates, the closed cavity is filled with phase change refrigerant, and each of the condensation plates has a preset angle with the horizontal plane, so that after the phase change refrigerant is condensed, it moves along the surface of the condensation plate to the longitudinal beam under the action of gravity.

[0008] Preferably, two heat dissipation vertical plates are provided, and the inner ends thereof are respectively connected to the two sides of the longitudinal beam; the top ends, the bottom ends and the outer ends of the two heat dissipation vertical plates are integrally formed and connected.

[0009] Preferably, the condensation plates are arranged on the inner wall surfaces of the two heat dissipation vertical plates.

[0010] Preferably, the distribution positions of the condensing plates on the two heat dissipation vertical plates are staggered with each other in the vertical direction.

[0011] Preferably, each of the condensing plates forms a preset angle with the inner wall surface of the heat dissipating vertical plate, so that a reflux channel for accumulating a certain amount of the phase-change refrigerant is formed between the top surface of each of the condensing plates and the inner wall surface of the heat dissipating vertical plate.

[0012] Preferably, the dihedral angle of the reflux channel is 60° to 90°.

[0013] Preferably, each of the condensation plates is a wedge-shaped plate, and the bottom surface of the wedge-shaped plate is a condensation slope surface for causing the phase-change refrigerant to undergo a phase change upon cooling and slide down under the action of gravity.

[0014] Preferably, it also includes a plurality of supporting connecting rods connected between the inner wall surfaces of each of the heat dissipation vertical plates for improving the structural strength.

[0015] Preferably, each of the supporting connecting rods is respectively connected between the condensation slope surfaces of each of the condensation plates on two adjacent heat dissipation vertical plates.

[0016] The present invention further provides a heat sink, comprising a heat sink substrate and a plurality of heat sink fins arranged on the surface of the heat sink substrate, wherein the heat sink fins are specifically any of the heat sink fins described above.

[0017] The heat dissipation fins provided by the present invention mainly include longitudinal beams, heat dissipation vertical plates and condensation plates. Among them, the longitudinal beams are connected to the surface (generally the side) of the heat dissipation substrate and are distributed in the vertical direction (height direction). They are mainly used to absorb the heat transferred from the electronic components on the heat dissipation substrate and serve as the installation basis for the subsequent heat dissipation vertical plates. The heat dissipation vertical plates are arranged on the longitudinal beams, and at least two heat dissipation vertical plates are arranged at the same time. Each heat dissipation vertical plate is interlocked with each other on the longitudinal beam to form a closed cavity. The closed cavity is filled with a phase change refrigerant to use the closed cavity as a place for phase change heat transfer by the phase change refrigerant. The condensation plate is arranged on the inner wall surface of the heat dissipation vertical plate. Generally, there are multiple pieces distributed in layers along the vertical direction on the inner surface of the heat dissipation vertical plate. They are mainly used to make the phase change refrigerant change phase when it encounters cold and re-condense. Importantly, each condensation plate is at a preset angle to the horizontal plane, that is, it is tilted and distributed on the inner wall surface of the heat dissipation vertical plate. In this way, when the phase change refrigerant is cold and phase-changed and condensed, it will flow (or slide) along the surface of each condensation plate under the action of gravity until it flows to the longitudinal beam. Since the longitudinal beam is connected to the surface of the heat dissipation substrate, the phase change refrigerant can smoothly re-exchange heat with the heat dissipation substrate. Therefore, in the heat dissipation fins provided by the present invention, after the phase change refrigerant absorbs heat from the heat dissipation substrate at the bottom of the closed cavity, it undergoes a phase change and gradually rises to the top of the closed cavity. After encountering each condensation plate on the way, it encounters cold and condenses at the condensation plate, and flows back to the surface of the heat dissipation substrate along the tilted condensation plate under the action of gravity, and re-exchanges heat with the heat dissipation substrate. During this period, since each condensation plate is densely distributed along the height direction of the heat dissipation vertical plate, the phase change refrigerant can fill the closed cavity and simultaneously exchange heat with the heat dissipation substrate at different positions in the height direction of the heat dissipation vertical plate, thereby greatly improving the heat dissipation performance and reducing the heat dissipation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 The present invention provides a schematic diagram of the overall structure of a specific implementation method.

[0020] Figure 2 for Figure 1 Schematic diagram of the surface structure of the heat dissipation vertical plate shown in FIG.

[0021] Figure 3 Schematic diagram of the working principle of the heat sink fin.

[0022] in, Figure 1 — Figure 3 middle:

[0023] Horizontal inclination angle – α, vertical inclination angle – β;

[0024] Longitudinal beam—1, heat dissipation vertical plate—2, condensation plate—3, return channel—4, supporting connecting rod—5;

[0025] Inner end—21, outer end—22, top end—23, bottom end—24, top surface—31, condensation slope surface—32. DETAILED DESCRIPTION

[0026] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0027] Please refer to Figure 1 , Figure 1 The present invention provides a schematic diagram of the overall structure of a specific implementation method.

[0028] In a specific implementation manner provided by the present invention, the heat dissipation fins mainly include a longitudinal beam 1 , a heat dissipation vertical plate 2 and a condensation plate 3 .

[0029] Among them, the longitudinal beam 1 is connected to the surface (generally the side) of the heat dissipation substrate and is distributed vertically (in the height direction). It is mainly used to absorb the heat transferred from the electronic components on the heat dissipation substrate and serves as the installation basis for the subsequent heat dissipation vertical plate 2.

[0030] The heat dissipation vertical plate 2 is arranged on the longitudinal beam 1, and at least two heat dissipation vertical plates 2 are arranged at the same time. Each heat dissipation vertical plate 2 is buckled together on the longitudinal beam 1 to form a closed cavity, and the closed cavity is filled with a phase change refrigerant, so that the closed cavity is used as a place for phase change heat transfer by the phase change refrigerant. At the same time, the outer surface of the heat dissipation vertical plate 2 is used to dissipate heat into the air. Generally, the phase change refrigerant is a gas-liquid refrigerant.

[0031] The condensation plate 3 is arranged on the inner wall surface of the heat dissipation vertical plate 2. Generally, there are multiple plates distributed in layers along the vertical direction on the inner surface of the heat dissipation vertical plate 2, which are mainly used to make the phase change refrigerant recondense when it encounters cold phase change. It is important that each condensation plate 3 is at a preset angle with the horizontal plane (the horizontal inclination angle α shown in the figure is generally 15° to 30°), that is, it is obliquely distributed on the inner wall surface of the heat dissipation vertical plate 2. In this way, when the phase change refrigerant condenses when it encounters cold phase change, it will flow (or slide) along the surface of each condensation plate 3 under the action of gravity until it flows to the longitudinal beam 1. Since the longitudinal beam 1 is connected to the surface of the heat dissipation substrate, the phase change refrigerant can smoothly re-exchange heat with the heat dissipation substrate.

[0032] Therefore, in the heat dissipation fins provided in the present embodiment, after the phase change refrigerant absorbs heat from the heat dissipation substrate at the bottom of the closed cavity, a phase change occurs and gradually rises to the top of the closed cavity. On the way, it hits each condensation plate 3 and condenses at the condensation plate 3. Under the action of gravity, it flows back to the surface of the heat dissipation substrate along the inclined condensation plate 3 to exchange heat with the heat dissipation substrate again. During this period, since the condensation plates 3 are densely distributed along the height direction of the heat dissipation vertical plate 2, the phase change refrigerant can fill the closed cavity and, at the same time, exchange heat with the heat dissipation substrate at different positions in the height direction of the heat dissipation vertical plate 2, thereby greatly improving the heat dissipation performance and reducing the heat dissipation cost.

[0033] In a preferred embodiment of the heat dissipation vertical plate 2, two heat dissipation vertical plates 2 can be arranged on the longitudinal beam 1 at the same time. Specifically, in order to increase the contact area between the longitudinal beam 1 and the heat dissipation substrate, the longitudinal beam 1 can be a long rectangular plate structure. The two heat dissipation vertical plates 2 can be respectively arranged on both sides of the longitudinal beam 1, and the inner ends 21 of the two heat dissipation vertical plates 2 can be respectively connected to the two sides of the longitudinal beam 1. At the same time, in order to facilitate the formation of a closed cavity and improve the sealing performance of the closed cavity, in this embodiment, the top ends 23 of the two heat dissipation vertical plates 2 are integrally connected to the top ends 23, and the bottom ends 24 of the two heat dissipation vertical plates 2 are integrally connected to the bottom ends 24 and the outer ends 22 are integrally connected to the outer ends 22. Overall, the heat dissipation fins are in the shape of a rectangular thin plate with a hollow interior.

[0034] For the condensation plate 3, the condensation plate 3 can be distributed only on the inner wall surface of one of the heat dissipation vertical plates 2, or can be distributed on the inner wall surfaces of two heat dissipation vertical plates 2 at the same time. In order to improve the heat dissipation efficiency, the latter embodiment is generally selected. Such a setting can increase the physical state change rate of the phase change refrigerant and accelerate the heat exchange efficiency.

[0035] Furthermore, considering that the phase-change refrigerant changes from liquid to gas after absorbing heat at the bottom of the closed cavity, and gradually rises to the top of the closed cavity along the height direction, in order to ensure the smooth rising movement of the phase-change refrigerant, in this embodiment, two adjacent rows of condensation plates 3 are staggered in the vertical direction. That is, each condensation plate 3 on one of the heat dissipation vertical plates 2 is at a different height position from each condensation plate 3 on the other half of the heat dissipation vertical plates 2. With such a configuration, when the phase-change refrigerant changes to a gas state and gradually rises, there will be no obvious volume expansion and contraction in the closed cavity, and the flow rate of the phase-change refrigerant is relatively stable and the distribution is relatively uniform. Of course, if the height positions of the two adjacent rows of condensation plates 3 are the same, a regular expansion-contraction gas channel will be formed in the closed cavity, which has a certain influence on the heat dissipation performance.

[0036] In addition, since each heat dissipation vertical plate 2 forms a closed cavity connected up and down, the steam formed by the phase change refrigerant absorbing heat can always rise to the closed cavity along the height direction, and the flow efficiency is relatively high. When injecting liquid, only one injection port needs to be designed. The structure is simpler and the processing is more convenient. Compared with the steam channel form of the blowing plate, the closed cavity structure of this embodiment has less resistance to the diffusion of the gaseous phase change refrigerant and a larger condensation area, so it has a better heat exchange effect.

[0037] like Figure 2 , Figure 3 As shown, Figure 2 for Figure 1 The schematic diagram of the surface structure of the heat dissipation vertical plate 2 is shown in FIG. Figure 3 Schematic diagram of the working principle of the heat sink fin.

[0038] In a preferred embodiment of the condensing plate 3, considering that the gas phase-change refrigerant flows along the surface of the condensing plate 3 to the longitudinal beam 1 after being cooled and condensed, in order to improve the adhesion of the condensing plate 3 to the phase-change refrigerant and prevent the phase-change refrigerant from falling from the current height position after being cooled and condensed, in this embodiment, the orientation of each condensing plate 3 forms a preset angle (vertical inclination angle β shown in the figure) with the inner wall surface of the heat dissipation vertical plate 2 where it is located, which is equivalent to each condensing plate 3 being obliquely inserted on the inner wall surface of the heat dissipation vertical plate 2. In this way, a certain inclination space is formed between the top surface 31 of each condensing plate 3 and the inner wall surface of the heat dissipation vertical plate 2, which can be used to store a certain amount of liquid phase-change refrigerant, and at the same time, the liquid phase-change refrigerant can flow back to the longitudinal beam 1 along the inclination space, so the inclination space is the reflux channel 4 of the liquid phase-change refrigerant. Specifically, the dihedral angle (i.e., the vertical inclination angle β) of the reflux channel 4 is generally 60° to 90°, that is, the condensation plate 3 is inclined upward on the inner wall surface of the heat dissipation vertical plate 2. If the angle is too small, the reflux amount is insufficient; if the angle is too large, the reflux liquid is easy to overflow.

[0039] Of course, in order to reduce the complexity of processing, the two-face angle of the reflux channel 4 can also be between 90° and 180°. In this way, the condensation plate 3 will be tilted downward on the inner wall surface of the heat dissipation vertical plate 2, which can enhance the ability of the liquid phase change refrigerant to reflux to different substrate heights.

[0040] Furthermore, in order to facilitate the condensation of the gas phase change refrigerant on the condensation plate 3 when it is cold, in this embodiment, each condensation plate 3 is a wedge-shaped plate, and its overall structure is in the shape of a long wedge, and its cross-section is in the shape of an oblique triangle. In this way, each condensation plate 3 has two exposed surfaces, which are divided into an upper top surface 31 and a lower bottom surface according to the vertical direction. Among them, the top surface 31 and the bottom surface are both inclined surfaces, and the surface area of ​​the bottom surface is generally larger, which is mainly used to contact with the gas phase change refrigerant, so that the gas phase change refrigerant condenses on the bottom surface when it is cold to form a liquid phase change refrigerant. Therefore, the bottom surface is a condensation slope 32. At the same time, for the two vertically adjacent condensation plates 3, the liquid phase change refrigerant flows down from the bottom surface of the upper condensation plate 3 until it reaches the top surface 31 of the lower condensation plate 3, that is, it is accumulated in the reflux channel 4 of the lower condensation plate 3, and at the same time refluxes to the longitudinal beam 1.

[0041] In addition, considering that the heat dissipation fins are hollow structures as a whole, in order to improve the structural strength, this embodiment adds a number of supporting connecting rods 5 between each heat dissipation vertical plate 2 to connect each heat dissipation vertical plate 2 to each other. Specifically, each supporting connecting rod 5 can be connected between the inner wall surfaces of each heat dissipation vertical plate 2. At the same time, in order to avoid blocking the reflux channel 4 of each condensation plate 3, in this embodiment, each supporting connecting rod 5 is specifically connected between the condensation slope 32 (bottom surface) of two adjacent rows of condensation plates 3. Such a setting only changes the flow path of the liquid phase change refrigerant along the condensation slope 32, and completely avoids the reflux channel 4.

[0042] This embodiment also provides a heat sink, which mainly includes a heat dissipation substrate and a plurality of heat dissipation fins arranged on the surface of the heat dissipation substrate, wherein the specific content of the heat dissipation fins is the same as the above-mentioned related content and will not be repeated here.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation fin, characterized in that: The heat dissipation device comprises a longitudinal beam (1) connected to the surface of a heat dissipation substrate and used to absorb the heat thereof, at least two heat dissipation vertical plates (2) arranged on the longitudinal beam (1) and interlocked to form a closed cavity, and a plurality of condensation plates (3) distributed along the vertical layer on the inner wall surface of at least one of the heat dissipation vertical plates (2), wherein the closed cavity is filled with a phase change refrigerant, and each of the condensation plates (3) forms a preset angle with the horizontal plane, so that the phase change refrigerant moves along the surface of the condensation plate (3) to the longitudinal beam (1) under the action of gravity after condensation. ; Each of the condensing plates (3) forms a preset angle with the inner wall surface of the heat dissipating vertical plate (2) where it is located, so that a reflux channel (4) for accumulating a certain amount of the phase-change refrigerant is formed between the top surface (31) of each of the condensing plates (3) and the inner wall surface of the heat dissipating vertical plate (2) where it is located; the two-sided angle of the reflux channel (4) is 60°~90°; each of the condensing plates (3) is a wedge-shaped plate, and the bottom surface of the wedge-shaped plate is a condensation slope (32) for causing the phase-change refrigerant to undergo a phase change upon cooling and slide down under the action of gravity.

2. The heat dissipation fin according to claim 1, characterized in that: Two heat dissipation vertical plates (2) are provided, and their inner ends (21) are respectively connected to the two sides of the longitudinal beam (1); the top ends (23), bottom ends (24) and outer ends (22) of the two heat dissipation vertical plates (2) are integrally formed and connected.

3. The heat dissipation fin according to claim 2, characterized in that: The condensation plates (3) are arranged on the inner wall surfaces of the two heat dissipation vertical plates (2).

4. The heat dissipation fin according to claim 3, characterized in that: The distribution positions of the condensation plates (3) on the two heat dissipation vertical plates (2) in the vertical direction are staggered with each other.

5. The heat dissipation fin according to any one of claims 1 to 4, characterized in that: It also includes a plurality of supporting connecting rods (5) connected between the inner wall surfaces of each of the heat dissipation vertical plates (2) and used to improve the structural strength.

6. The heat dissipation fin according to claim 5, characterized in that: Each of the supporting connecting rods (5) is respectively connected between the condensation slope surfaces (32) of each of the condensation plates (3) on two adjacent heat dissipation vertical plates (2).

7. A heat sink, comprising a heat sink substrate and a plurality of heat sink fins arranged on the surface of the heat sink substrate, characterized in that: The heat dissipation fin is specifically the heat dissipation fin according to any one of claims 1-6.

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