Tiltable high-power efficient heat dissipation device

Abstract

The invention relates to an inclinable high-power efficient heat dissipation device. A heat dissipation main body of the device comprises a heat dissipation cavity and heat dissipation fins which are integrated; the heat dissipation cavity is of a flat barrel-shaped structure, and a phase change working medium is poured into the heat dissipation cavity. Vertical heat dissipation fins which are parallel to one another are distributed on the side wall of the top of the heat dissipation cavity; the backflow body assembly is of a combined structure formed by stacking materials with capillary force capacity, the inner surface of the side wall of the bottom of the heat dissipation cavity serves as a backflow body connecting face, and the backflow body assembly is pressed and fixed to the backflow body connecting face through the backflow body fixing plate. The middle of the outer surface of the bottom side wall of the heat dissipation cavity is a heat source fixing area. The efficiency of the heat dissipation device of high-power heating devices and equipment is improved, meanwhile, the heat dissipation capacity of the device in an angle inclination use scene can be guaranteed, and the heat dissipation device can be applied to energy-saving heat management of LED lamps, high-performance computers, high-power lasers and high-power power electronic equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation devices and relates to a tiltable high-power and high-efficiency heat dissipation device. Background Art

[0002] LED light sources have the advantages of high efficiency, small size, light weight and long life. COB LED light sources also have the technical characteristics of accurate light distribution and high integration. They are currently widely used in various fields such as sports, roads, tunnels, bridges and railways. At the same time, COB light sources have strict requirements on temperature and high requirements on matching heat sinks. When LED is working, only part of the electrical energy is converted into light energy, and the rest of the electrical energy is dissipated in the form of heat energy. According to statistics, if the heat generated by the LED chip cannot be dissipated in time, the chip temperature will increase. In general, for every 10°C increase in the junction temperature of the LED chip, its luminous flux will decrease by about 3-5%, and it will also accelerate the aging of the chip and shorten the service life of the LED.

[0003] Low-power LED light sources usually use profile heat sinks. However, in the field of high-power LED lighting, due to the sharp increase in heat flux density, the heat sink of the light source usually uses profile heat sinks with phase change cavities and heat pipe heat sinks. Profile heat sinks are more sensitive to tilt angles. Figure 1 As shown in the figure, the existing heat sink has a cylindrical phase change cavity, and the fins radiate around the phase change cavity. When it is not tilted (0°), the lower heat source generates heat, and the working fluid in the phase change cavity absorbs the heat transferred from the heating surface, and the liquid is transformed into gas, and the heat is quickly transferred to each fin around. At this time, the air can flow upward in the direction of the arrows between the fins and take away the heat. The heat dissipation fins can make full use of the rising principle of hot air, and the heat dissipation effect is better. When tilted at a certain angle (such as 90°), Figure 2 As shown, the working fluid sinks to the bottom, away from the heating surface, and cannot undergo phase change. At the same time, the upward flow channel of air between the fins below disappears, and the air flow between the fins is blocked, which greatly reduces the heat dissipation capacity of the radiator.

[0004] Heat pipe radiators use heat pipes to transfer heat, and the radiator fins can be arranged to facilitate air flow, but the heat pipes and cooling fins are usually connected by fin-through means. There is a large contact thermal resistance between the two sides of the connection position of the structure, which reduces the efficiency of the radiator. Especially in high-power heat dissipation, the thermal resistance effect is more obvious. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a tiltable high-power and high-efficiency heat dissipation device, which can be tilted at any angle within 0-90 degrees and has high heat dissipation efficiency.

[0006] In order to solve the above technical problems, the tiltable high-power and high-efficiency heat dissipation device of the present invention includes a heat dissipation body, a return fluid component, and a return fluid fixing plate; the heat dissipation body includes an integrated heat dissipation cavity and heat dissipation fins; the heat dissipation cavity is a flat cylindrical structure, and a phase change working medium is poured into its interior; parallel and vertical heat dissipation fins are distributed on the top side walls of the heat dissipation cavity; the return fluid component adopts a combined structure formed by stacking materials with capillary force capabilities, the inner surface of the bottom side wall of the heat dissipation cavity is used as the return fluid connection surface, and the return fluid component is pressed and fixed on the return fluid connection surface by the return fluid fixing plate; the middle part of the outer surface of the bottom side wall of the heat dissipation cavity is the heat source fixing area.

[0007] The heat dissipation cavity is a trapezoidal flat cylinder structure or a rectangular flat cylinder structure with one side open, and the open side is blocked by a cover plate.

[0008] A support platform is processed on one side of the opening of the heat dissipation cavity, and the cover plate is fixedly connected to the inner wall of the support platform.

[0009] Furthermore, inside the heat dissipation cavity, a positioning column is provided on a side opposite to the cover plate and is integrated with the inner wall of the heat dissipation cavity, and the notch of the return fluid component clamps the positioning column.

[0010] The return fluid assembly and the return fluid fixing plate have the same edge shape; inside the heat dissipation cavity, both sides of the positioning column also have a first clamping structure that is integrated with the inner wall of the heat dissipation cavity; there is a wedge-shaped gap between the bottom surface of the first clamping structure and the return fluid connection surface; the inner surface of the cover plate is fixed with a second clamping structure corresponding to the position of the first clamping structure, and there is a wedge-shaped gap between the bottom surface of the second clamping structure and the return fluid connection surface; the inner edges of the return fluid assembly and the return fluid fixing plate located on both sides of the notch are embedded in the wedge-shaped gap between the bottom surface of the first clamping structure and the return fluid connection surface; the outer edges of the return fluid assembly and the return fluid fixing plate are embedded in the wedge-shaped gap between the bottom surface of the second clamping structure and the return fluid connection surface.

[0011] A sealing opening is processed in the middle of the top of the heat dissipation cavity; a sealing screw is threadedly connected to the sealing opening and sealed by a rubber ring; parallel and vertical heat dissipation fins are distributed on the left and right parts of the top side walls of the heat dissipation cavity.

[0012] The return fluid connection surface is nickel-plated; the return fluid component is connected to the return fluid connection surface through a welding piece.

[0013] The return fluid component is made of mesh material with a mesh size of 100-500 meshes.

[0014] The return fluid component adopts a mesh structure made of 2 to 10 layers of copper meshes tightly stacked and spot-welded together.

[0015] The return fluid fixing plate adopts a frame structure.

[0016] Beneficial effects:

[0017] 1. The present invention adopts an integrated design, making the heat dissipation cavity and heat dissipation fins used for heat conduction into an integral structure, avoiding the contact thermal resistance caused by the separate design of the heat conduction and heat dissipation structures, and improving the heat dissipation efficiency of the device.

[0018] 2. By setting up the return fluid component structure, the working fluid return of the device under the condition of tilt angle is strengthened, ensuring that the heat dissipation capacity of the device is not affected by the angle. The vertical design of the heat dissipation fins solves the problem of air flow obstruction when the heat dissipation device is tilted at a certain angle, especially at 90°, greatly improving the convection heat transfer coefficient and optimizing the heat dissipation capacity of the device.

[0019] The present invention improves the efficiency of the heat dissipation device of high-power heating components and equipment, while ensuring the heat dissipation capacity of the device in an angle-tilted usage scenario, and can be applied to energy-saving thermal management of LED lamps, high-performance computers, high-power lasers, and high-power power electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the principle of hot air rising when the heat dissipation device of the prior art is used vertically.

[0021] Figure 2 It is a schematic diagram of the principle of hot air rising when the heat dissipation device of the prior art is used at an angle of 90 degrees.

[0022] Figure 3 It is a three-dimensional view of the present invention when the cover plate is removed.

[0023] Figure 4 It is a cutaway perspective view of the present invention.

[0024] Figure 5 It is a three-dimensional diagram of the cover.

[0025] Figure 6 It is a perspective view of the return fluid component.

[0026] Figure 7 It is a schematic diagram of the principle of hot air rising when the present invention is used vertically.

[0027] Figure 8 It is a schematic diagram of the principle of hot air rising when the present invention is used at an angle of 90 degrees.

[0028] Fig. 9 Schematic diagram of a heat dissipation device in the prior art according to a comparative example.

[0029] In the figure: 1. heat dissipation body; 11. heat dissipation cavity; 111. support platform; 112. positioning column; 1121. wire hole; 113. first clamping structure; 114. sealing port; 115. sealing screw; 116. heat source fixing area; 12. heat dissipation fins; 13. cover plate; 131. second clamping structure; 2. return fluid assembly; 21. notch; 3. return fluid fixing plate; 4. fixing plate screw. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below 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 invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" or "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] like Figure 3 , 4As shown, the tiltable high-power and high-efficiency heat dissipation device of the present invention comprises a heat dissipation body 1 , a return fluid component 2 , and a return fluid fixing plate 3 .

[0035] The heat dissipation body 1 includes an integrated heat dissipation cavity 11 and heat dissipation fins 12; the heat dissipation cavity 11 is a trapezoidal flat cylinder structure or a flat rectangular flat cylinder structure with one side open, and the phase change working medium is poured inside; the open side of the heat dissipation cavity 11 is blocked by a cover plate 13; the open side of the heat dissipation cavity 11 can be processed with a base 111, and the cover plate 13 and the inner wall of the base 111 are fixed together by interference fit, welding or bonding; the cover plate 13 can also be directly fixed to the inner wall of the end of the heat dissipation cavity 11 by interference fit, welding or bonding; the inner surface of the bottom side wall of the heat dissipation cavity is used as a return fluid connection surface for fixing the return fluid component 2; the return fluid connection surface is nickel-plated.

[0036] Inside the heat dissipation cavity 11, a positioning column 112 and a first clamping structure 113 which are integrated with the inner wall of the heat dissipation cavity 11 are arranged on the side opposite to the cover plate 13, and the first clamping structure 113 is located on both sides of the positioning column 112; a wire hole 1121 for the power cord of the heating element to pass through is processed at the positioning column 112; and a wedge-shaped gap is provided between the bottom surface of the first clamping structure 113 and the return fluid connection surface.

[0037] like Figure 5 As shown, a second pressing structure 131 corresponding to the position of the first pressing structure 113 is fixed on the inner surface of the cover plate 13, and a wedge-shaped gap is provided between the bottom surface of the second pressing structure 131 and the return fluid connection surface.

[0038] A sealing opening 114 is processed in the middle of the top of the heat dissipation cavity 11; a sealing screw 115 is threadedly connected to the sealing opening 114 and sealed by a rubber ring; parallel and vertical heat dissipation fins 12 are distributed on the left and right parts of the top side walls of the heat dissipation cavity 11; the middle part of the outer surface of the bottom side wall of the heat dissipation cavity 11 is a heat source fixing area 116 for fixing the heating element, and the heating element can be fixed according to the requirements of use, such as screw connection, bonding, crimping, etc.

[0039] The heat dissipation body 1 is made of die-cast aluminum alloy material or metal copper, aluminum, silver, gold and other materials with good thermal conductivity.

[0040] The return fluid component 2 adopts a combined structure formed by stacking materials with capillary force capabilities. The material with capillary force can be a single material or a composite of multiple materials selected from mesh materials, porous materials, foam materials, and fiber cluster materials. When the return fluid component is a mesh material, the mesh size should be 100-500 mesh.

[0041] Specifically, the return fluid component 2 can adopt a mesh structure made of 2 to 10 layers of copper mesh tightly stacked and spot-welded together, and its inner edge has a notch 21 corresponding to the shape of the positioning column 112; the mesh size of the copper mesh is 500 mesh. The return fluid component 2 is connected to the return fluid connection surface through a welding piece, and the notch 21 clamps the positioning column 112; the shape and size of the welding piece are the same as those of the return fluid component 2, and its function is to achieve a higher heat transfer capacity between the return fluid component 2 and the bottom of the heat dissipation cavity 11, while ensuring a reliable connection between the two. The return fluid component 2 can also be connected to the return fluid connection surface by bonding or any other method that is conducive to heat transfer.

[0042] The return fluid fixing plate 3 adopts a frame structure, and its edge shape is the same as that of the return fluid component 2, and is pressed on the return fluid component 2; the return fluid component 2 and the return fluid fixing plate 3 are fixedly connected to the bottom of the heat dissipation cavity 11 through the fixing plate screws 4, and the inner edges of the return fluid component 2 and the return fluid fixing plate 3 located on both sides of the notch 21 are embedded in the wedge-shaped gap between the bottom surface of the first clamping structure 113 and the return fluid connection surface; the outer edges of the return fluid component 2 and the return fluid fixing plate 3 are embedded in the wedge-shaped gap between the bottom surface of the second clamping structure 131 and the return fluid connection surface.

[0043] The first clamping structure 113 and the second clamping structure 131 are used to clamp and fix the edge area of ​​the return fluid component 2 and the return fluid fixing plate 3 to ensure good contact between the various layers of the return fluid component 2 and good contact between the lower surface of the return fluid component 2 and the return fluid connecting surface.

[0044] When the heat dissipation device (size 300mm×70mm×60mm) of the present invention is used, when the tilt angle is 0°, the temperature of the monitoring point of the heating element is 77.8°C after 4 hours of continuous use; when the tilt angle is 45°, the temperature of the monitoring point of the heating element is 78.1°C after 4 hours of continuous use; when the tilt angle is 90°, the temperature of the monitoring point of the heating element is 79.1°C after 4 hours of continuous use.

[0045] Use Fig. 9 The prior art heat dissipation device (300mm×74mm×59mm) shown is used as a comparative example. When its tilt angle is 0°, the temperature of the monitoring point of the heating element is 80.2°C after 4 hours of continuous use; when the tilt angle is 45°, the temperature of the monitoring point of the heating element is 82.5°C after 4 hours of continuous use; when the tilt angle is 90°, the temperature of the monitoring point of the heating element is 109.8°C after 4 hours of continuous use.

Claims

1. A tiltable high-power and high-efficiency heat dissipation device, comprising a heat dissipation body (1), wherein the heat dissipation body comprises an integrated heat dissipation cavity (11) and heat dissipation fins (12); characterized in that It also includes a return fluid component (2) and a return fluid fixing plate (3); the heat dissipation cavity is a flat cylindrical structure, and a phase change medium is poured into the interior thereof; parallel and vertical heat dissipation fins are distributed on the top side wall of the heat dissipation cavity; the return fluid component adopts a combined structure formed by stacking materials with capillary force capabilities, and the inner surface of the bottom side wall of the heat dissipation cavity serves as the return fluid connection surface, and the return fluid component is pressed and fixed on the return fluid connection surface by the return fluid fixing plate; the middle part of the outer surface of the bottom side wall of the heat dissipation cavity is a heat source fixing area (116).

2. The tiltable high-power and high-efficiency heat dissipation device according to claim 1 is characterized in that The heat dissipation cavity is a trapezoidal flat cylinder structure or a rectangular flat cylinder structure with one side open, and the open side is blocked by a cover plate (13).

3. The tiltable high-power and high-efficiency heat dissipation device according to claim 2 is characterized in that A support platform (111) is processed on one side of the opening of the heat dissipation cavity, and the cover plate is fixedly connected to the inner wall of the support platform.

4. The tiltable high-power and high-efficiency heat dissipation device according to claim 2 is characterized in that Inside the heat dissipation cavity, a positioning column (112) is arranged on a side opposite to the cover plate and is integrated with the inner wall of the heat dissipation cavity, and the notch (21) of the return fluid component clamps the positioning column.

5. The tiltable high-power and high-efficiency heat dissipation device according to claim 4, characterized in that The return fluid assembly and the return fluid fixing plate have the same edge shape; inside the heat dissipation cavity, both sides of the positioning column also have a first clamping structure (113) that is integrated with the inner wall of the heat dissipation cavity; a wedge-shaped gap is provided between the bottom surface of the first clamping structure and the return fluid connection surface; a second clamping structure corresponding to the position of the first clamping structure is fixed on the inner surface of the cover plate, and a wedge-shaped gap is provided between the bottom surface of the second clamping structure and the return fluid connection surface; the inner edges of the return fluid assembly and the return fluid fixing plate located on both sides of the notch are embedded in the wedge-shaped gap between the bottom surface of the first clamping structure and the return fluid connection surface; the outer edges of the return fluid assembly and the return fluid fixing plate are embedded in the wedge-shaped gap between the bottom surface of the second clamping structure and the return fluid connection surface.

6. The tiltable high-power and high-efficiency heat dissipation device according to claim 1, characterized in that A sealing opening (114) is processed in the middle of the top of the heat dissipation cavity; a sealing screw (115) is threadedly connected to the sealing opening and sealed by a rubber ring; and parallel and vertical heat dissipation fins are distributed on the left and right parts of the top side walls of the heat dissipation cavity.

7. The tiltable high-power and high-efficiency heat dissipation device according to claim 1, characterized in that The return fluid connection surface is nickel-plated; the return fluid component is connected to the return fluid connection surface through a welding piece.

8. The tiltable high-power and high-efficiency heat dissipation device according to claim 1, characterized in that The return fluid component is made of mesh material with a mesh size of 100-500 meshes.

9. The tiltable high-power and high-efficiency heat dissipation device according to claim 8, characterized in that The return fluid component adopts a mesh structure made of 2 to 10 layers of copper meshes tightly stacked and spot-welded together.

10. The tiltable high-power and high-efficiency heat dissipation device according to claim 1, characterized in that The return fluid fixing plate adopts a frame structure.

Images