High-heat-flux aluminum-based flat plate heat pipe radiator

Abstract

The utility model relates to the technical field of heat pipe radiators, in particular to a high-heat-flux aluminum-based flat plate heat pipe radiator. In the utility model, relay phase change heat transfer is carried out through the first heat transfer layer consisting of the two first aluminum-based flat heat pipes arranged in the V shape and the second heat transfer layer consisting of the plurality of second aluminum-based flat heat pipes, and heat is dissipated into air through the heat dissipation layer consisting of the plurality of aluminum-based heat dissipation fins, so that the effective heat dissipation area is greatly increased; the heat dissipation effect is improved, and meanwhile the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pipe radiators, in particular to a high heat flux density aluminum-based flat heat pipe radiator. Background Technique

[0002] A radiator is an indispensable component to ensure the normal operation of power devices; currently, there are two common types of radiators. The first is to conduct heat transfer through aluminum alloy and then dissipate heat through aluminum alloy fins; the second is to transfer heat through copper heat pipes and then dissipate heat through aluminum alloy fins.

[0003] Currently, when using the first heat dissipation method, when dissipating heat from a heat source with a high heat flux density, it is necessary to increase the thickness of the aluminum alloy heat sink to enhance the heat conduction ability. This not only increases the material consumption but also, due to the heat transfer ability of the aluminum alloy, the heat dissipation ability of the radiator cannot meet the application requirements; for the second heat dissipation method, compared with the first heat dissipation method, the heat dissipation ability is greatly improved, but due to the high price of copper and the high processing cost of copper heat pipes, its application range is limited. Summary of the Invention

[0004] In order to overcome the above deficiencies, the purpose of the utility model is to provide a high heat flux density aluminum-based flat heat pipe radiator, which conducts relay phase change heat transfer through a first heat transfer layer composed of two first aluminum-based flat heat pipes arranged in a V shape and a second heat transfer layer composed of several second aluminum-based flat heat pipes, and then dissipates heat into the air through a heat dissipation layer composed of several aluminum-based heat dissipation fins, greatly increasing the effective heat dissipation area, improving the heat dissipation effect, and having a low cost at the same time.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A high heat flux aluminum-based flat heat pipe radiator, characterized in that it includes a first heat transfer layer, a second heat transfer layer and a heat dissipation layer connected in sequence; the first heat transfer layer includes two first aluminum-based flat heat pipes, both of the two first aluminum-based flat heat pipes are in direct or indirect contact with the heat source, the highest point of the end thereof not in contact with the heat source is higher than the highest point of the heat source, and the included angle between the axial direction of its heat pipe and the Y direction is θ1, where 45° ≤ θ1 ≤ 85°; the second heat transfer layer includes several second aluminum-based flat heat pipes, one surface of each second aluminum-based flat heat pipe is in direct or indirect contact with the surface of the first heat transfer layer, and the other surface is in direct or indirect contact with the surface of the heat dissipation layer, and the included angle between the axial direction of the heat pipe in the second aluminum-based flat heat pipe and the Y direction is θ2, where 0 ≤ θ2 < 45°; grooves are provided on the inner surfaces of the heat pipes in the first aluminum-based flat heat pipes and the second aluminum-based flat heat pipes, the cavities of the first aluminum-based flat heat pipes and the second aluminum-based flat heat pipes are formed by aluminum alloy extrusion, and both ends thereof are sealed to form a cavity, and the cavity is evacuated and then filled with a phase change heat transfer working fluid.

[0007] As an improvement of the present invention, the second aluminum-based flat heat pipe is bonded to the heat dissipation layer through a thermally conductive structural adhesive.

[0008] As a further improvement of the present invention, it further includes a second first heat transfer layer, and two surfaces thereof are respectively connected to a second heat source and a second heat conduction layer.

[0009] In the present invention, through the first heat transfer layer composed of two first aluminum-based flat heat pipes arranged in a V shape and the second heat transfer layer composed of several second aluminum-based flat heat pipes, relay phase change heat transfer is carried out, and then heat dissipation is carried out to the air through the heat dissipation layer composed of several aluminum-based heat dissipation fins, greatly increasing the effective heat dissipation area, improving the heat dissipation effect, and at the same time having a low cost. Description of the Drawings

[0010] For ease of explanation, the present invention is described in detail by the following preferred embodiments and accompanying drawings.

[0011] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention;

[0012] Figure 2 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0013] Figure 3 It is a structural schematic diagram of the first aluminum-based flat heat pipe;

[0014] Reference Signs:

[0015] 1 - First heat source, 11 - First heat transfer layer of heat source 1, 111 - First aluminum-based flat heat pipe of heat transfer layer 11, 112 - Second aluminum-based flat heat pipe of heat transfer layer 11, 12 - Second heat transfer layer and aluminum-based flat heat pipe of heat source 1, 3 - Heat dissipation layer;

[0016] Z 111 - Axial direction of the heat pipe in the aluminum-based flat heat pipe 111;

[0017] Z 112 - Axial direction of the heat pipe in the aluminum-based flat heat pipe 112;

[0018] θ1 - Angle between the heat pipe in the first heat conduction layer and the Y direction;

[0019] θ 111 - Z 111 Angle with the Y direction;

[0020] θ 112 - Z 112 Angle with the Y direction;

[0021] H1 - Highest point of heat source 1;

[0022] H 111 - Highest point of the aluminum-based flat heat pipe 111;

[0023] H 112 - Highest point of the aluminum-based flat heat pipe 112;

[0024] 2 - Second heat source, 21 - First heat transfer layer of heat source 2, 211 - First aluminum-based flat heat pipe of heat transfer layer 21, 212 - Second aluminum-based flat heat pipe of heat transfer layer 21;

[0025] Z 12 - Axial direction of the heat pipe in the aluminum-based flat heat pipe 12;

[0026] 4 - Aluminum-based flat heat pipe, 41 - Heat pipe in the aluminum-based flat heat pipe, Z 41 - Axial direction of the heat pipe 41. Detailed implementation mode

[0027] In order to make the purpose, technical solution and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] Embodiment 1 of the present utility model is as Figure 1As shown in the figure, Embodiment 1 includes a first heat source 1, and further includes a first heat transfer layer 11, a second heat transfer layer 12, and a heat dissipation layer 3 that are connected in sequence; the first heat source 1 is directly or indirectly attached to the first heat transfer layer 11; the first heat transfer layer 11 includes a first aluminum-based flat heat pipe 111 and a second aluminum-based flat heat pipe 112, both the aluminum-based flat heat pipe 111 and the second aluminum-based flat heat pipe 112 are directly or indirectly in contact with the first heat source 1, and the highest points H 111 and H 112 of the ends of the aluminum-based flat heat pipes 111 and 112 that are not in contact with the first heat source 1 are both higher than the highest point H1 of the heat source 1, and the angles θ 111 and θ 112 between the axial directions of the heat pipes in the aluminum-based flat heat pipes 111 and 112 and the Y direction both satisfy 45° ≤ θ1 ≤ 85°. In this Embodiment 1, θ 111 = θ 112 = 75°. It should be noted that θ 111 and θ 112 are not necessarily equal and are determined according to actual needs; the second heat transfer layer 12 includes several second aluminum-based flat heat pipes 121, one surface of each second aluminum-based flat heat pipe 121 is directly or indirectly in contact with the surface of the first heat transfer layer 11, and the other surface is directly or indirectly in contact with the surface of the heat dissipation layer 3. The angle θ2 between the axial direction of the heat pipes in the second aluminum-based flat heat pipes 121 and the Y direction satisfies 0 ≤ θ2 < 45°. In this embodiment, θ2 = 0, that is, it is consistent with the Y direction; the first aluminum-based flat heat pipes 111 and 112, and the second aluminum-based flat heat pipes 121 all contain several heat pipes 41. Grooves are provided on the inner surface of the heat pipes. The cavities and grooves of the aluminum-based flat heat pipes are formed by aluminum alloy extrusion, and both ends are sealed to form cavities. After the cavities are evacuated, a phase change heat transfer working fluid is filled; the heat dissipation layer 3 includes several aluminum-based heat dissipation fins, and folded fins or offset fins can be used. In this Embodiment 1, offset fins are used.

[0029] In this Embodiment 1, the phase change heat transfer working fluid in the aluminum-based flat heat pipe can be acetone, fluorinated liquid, or liquid ammonia. In this embodiment, acetone is selected. The second heat transfer layer 12 and the heat dissipation layer 3 are bonded with a thermal conductive structural adhesive. In this embodiment, an epoxy thermal conductive structural adhesive is used.

[0030] The working principle of heat transfer and dissipation in this Embodiment 1 is that heat is first transferred from the heat source 1 to a part of the heat transfer layer 11. The phase change heat transfer working fluid in the heat pipes of the aluminum-based flat heat pipes 111 and 112 absorbs heat and vaporizes, and quickly brings the heat to the entire outer shell of the heat transfer layer 11, and then transfers it to a part of the outer shell of the heat transfer layer 12, and also transfers the heat to the entire heat transfer layer 12 through phase change heat transfer, and then dissipates it into the air through the heat dissipation layer 3. After the gaseous phase change heat transfer working fluid in the heat pipe releases heat, it becomes a liquid, and under the action of gravity, it flows back to the heat source part and starts the next round of heat transfer cycle.

[0031] Embodiment 2 of the present utility model can be used for dual heat source heat dissipation, and includes two independent first heat transfer layers, which are respectively in contact with heat source 1 and heat source 2 to dissipate heat for heat source 1 and heat source 2. Each first heat transfer layer includes two first aluminum-based flat heat pipes; the two independent first heat transfer layers share the second heat transfer layer 12 and the heat dissipation layer 3. In Embodiment 2, the relative positions of the two groups of first aluminum-based flat heat pipes and the heat sources are the same as those in Embodiment 1.

[0032] In this patent document, unless otherwise specified, the Y direction refers to the direction in which the normal line of the horizontal plane points to space.

[0033] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A high heat flux aluminum-based flat heat pipe radiator, characterized in that It includes a first heat transfer layer, a second heat transfer layer and a heat dissipation layer connected in sequence; The first heat transfer layer includes two first aluminum-based flat heat pipes. Both of the two first aluminum-based flat heat pipes are in direct or indirect contact with the heat source. The highest point of the end not in contact with the heat source is higher than the highest point of the heat source, and the included angle between the axial direction of the heat pipe and the Y direction is θ1, where 45° ≤ θ1 ≤ 85°; The second heat transfer layer includes several second aluminum-based flat heat pipes. One surface of each second aluminum-based flat heat pipe is in direct or indirect contact with the surface of the first heat transfer layer, and the other surface is in direct or indirect contact with the surface of the heat dissipation layer. The included angle between the axial direction of the heat pipe in the second aluminum-based flat heat pipe and the Y direction is θ2, where 0 ≤ θ2 < 45°; Grooves are provided on the inner surfaces of the heat pipes in both the first aluminum-based flat heat pipe and the second aluminum-based flat heat pipe. The cavities of the first aluminum-based flat heat pipe and the second aluminum-based flat heat pipe are formed by aluminum alloy extrusion, and their two ends are sealed to form cavities. After the cavities are evacuated, a phase change heat transfer working fluid is injected; The heat dissipation layer includes several aluminum-based heat dissipation fins.

2. The high heat flux aluminum-based flat heat pipe radiator according to claim 1, wherein The second heat transfer layer is bonded to the heat dissipation layer through a thermally conductive structural adhesive.

3. The aluminum-based flat heat pipe radiator with a high heat flux density according to claim 1 or 2, characterized in that, It further includes a second first heat transfer layer, and its two surfaces are respectively connected to a second heat source and a second heat conduction layer.

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