An air-cooled heat dissipation unit and an air-cooled heat dissipation plate

Abstract

The application provides a forced air cooling heat dissipation unit and a forced air cooling heat dissipation plate. The forced air cooling heat dissipation unit comprises a heat dissipation groove in the form of an open groove structure with a circular cross section, fixed horizontal bars arranged at two ends of the heat dissipation groove, and a vane wheel rotatably arranged in the heat dissipation groove and rotatably connected to the fixed horizontal bars at two ends. The embodiment of the application has the beneficial effect that the vane wheel can destroy the boundary layer on the surface of the fin, thereby improving the forced air cooling heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat dissipation technology for electronic devices, specifically to an air-cooled heat dissipation unit and an air-cooled heat dissipation plate. Background Technology

[0002] With the rapid development of microelectronics technology, electronic systems are constantly evolving towards miniaturization, integration, and high density. This increasing functional density and shrinking size lead to ever-increasing heat flux density in electronic devices. During operation, the internal electronic components convert power into heat, which must be dissipated promptly to prevent overheating. Since component reliability is directly related to temperature, excessively high temperatures cause a rapid decline in reliability. Therefore, it is essential to control the temperature of electronic components within a suitable range.

[0003] Currently, the most widely used heat dissipation technologies for electronic devices include natural heat dissipation, forced air cooling, and liquid cooling. Forced air cooling uses air as the cooling medium, which is readily available and has good heat dissipation capabilities, thus it is widely used in electronic devices. Electronic components are soldered onto printed circuit boards (PCBs) to form electronic modules and assemblies with various functions. Since PCBs have a flat structure, electronic modules are generally also flat. Therefore, the heat sink of an electronic module is typically designed with fins on one side that exchange heat with the air, and a heat sink on the other side that contacts the electronic components for heat transfer. Due to the viscosity of air, a boundary layer forms on the surface of the fins. The airflow within this boundary layer is slow or even stagnant, hindering heat exchange between the fins and the air. Summary of the Invention

[0004] In view of this, the embodiments of this specification provide an air-cooled heat dissipation unit and an air-cooled heat dissipation plate to improve heat dissipation efficiency.

[0005] The embodiments of this specification provide the following technical solution: an air-cooled heat dissipation unit, comprising: a heat dissipation groove having an open groove structure with a circular cross-section; a fixed crossbar disposed at both ends of the heat dissipation groove; and an impeller rotatably disposed in the heat dissipation groove, wherein both ends of the impeller are rotatably connected to the fixed crossbar.

[0006] Furthermore, the impeller includes: a rotating main shaft, both ends of which are rotatably connected to a fixed crossbar; and a helical blade, which is disposed on the rotating main shaft and located in a heat dissipation groove, and the helical blade can drive the rotating main shaft to rotate in the heat dissipation groove.

[0007] Furthermore, the impeller also includes: an upper curved arm and a lower curved arm, which are disposed on the rotating main shaft and spaced apart from the helical blades, and the upper curved arm and the lower curved arm are spaced apart from each other; a steel wire, which is connected to the upper curved arm and the lower curved arm; and a roller, which is rotatably sleeved on the steel wire and can contact the inner wall of the heat dissipation groove.

[0008] Furthermore, the upper curved arm, lower curved arm, steel wire, and roller form a stirring unit, and the impeller includes multiple stirring units, which are evenly distributed circumferentially along the main rotating shaft.

[0009] Furthermore, the rotation axis of the impeller coincides with the central axis of the heat dissipation duct.

[0010] Furthermore, the fixed crossbar includes an inlet crossbar and an outlet crossbar, both of which are provided with mounting protrusions, and the two ends of the rotating spindle are provided with mounting holes that mate with the mounting protrusions.

[0011] Furthermore, along the gas flow direction, the helical blades are located downstream of the agitation unit.

[0012] Furthermore, the agitation unit and the inlet of the heat dissipation tank are spaced apart along the gas flow direction.

[0013] The present invention also provides an air-cooled heat sink, including multiple air-cooled heat sink units, and the multiple air-cooled heat sink units are arranged in an array along a set direction.

[0014] Compared with the prior art, the beneficial effects that can be achieved by the above-mentioned at least one technical solution adopted in the embodiments of this specification include at least the following: by setting the impeller, the boundary layer on the surface of the fins can be destroyed, thereby improving the air-cooling heat dissipation efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the air-cooled heat dissipation unit according to an embodiment of the present invention;

[0017] Figure 2 yes Figure 1 An explosion diagram;

[0018] Figure 3 This is an exploded structural diagram of the impeller in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the overall structure of the blade in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the internal geometry of the flow channel in an embodiment of the present invention;

[0021] Figure 6A schematic diagram of the air-cooled heat sink according to an embodiment of the present invention.

[0022] The attached diagram is labeled as follows: 1. Heat dissipation groove; 2. Impeller; 3. Outlet bar; 4. Inlet bar; 203. Spiral blade; 204. Upper curved arm; 205. Lower curved arm; 206. Steel wire; 207. Drum; 208. Rotating spindle. Detailed Implementation

[0023] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 6 As shown, this embodiment of the invention provides an air-cooled heat dissipation unit, including a heat dissipation groove 1, a fixed crossbar, and an impeller 2. The heat dissipation groove 1 has an open groove structure with a circular cross-section; the fixed crossbar is disposed at both ends of the heat dissipation groove 1; the impeller 2 is rotatably disposed in the heat dissipation groove 1, and both ends of the impeller 2 are rotatably connected to the fixed crossbar.

[0026] By setting impeller 2, the boundary layer on the fin surface can be broken, thereby improving the air-cooled heat dissipation efficiency.

[0027] like Figure 3 As shown, the impeller 2 in this embodiment of the invention includes:

[0028] The rotating spindle 208 is rotatably connected to the fixed crossbar at both ends.

[0029] The spiral blade 203 is mounted on the rotating main shaft 208 and is located in the heat dissipation groove 1. The spiral blade 203 can drive the rotating main shaft 208 to rotate in the heat dissipation groove 1.

[0030] The upper curved arm 204 and the lower curved arm 205 are mounted on the rotating main shaft 208 and spaced apart from the spiral blade 203, with the upper curved arm 204 and the lower curved arm 205 spaced apart from each other.

[0031] Steel wire 206 connects the upper curved arm 204 and the lower curved arm 205.

[0032] The roller 207 is rotatably mounted on the steel wire 206 and can contact the inner wall of the heat dissipation groove 1.

[0033] By setting the spiral blades 203, the upper curved arm 204 and the lower curved arm 205 can be driven to rotate, which in turn drives the roller 207 to roll against the inner wall of the heat dissipation groove 1, thereby breaking the boundary layer on the fin surface and improving the air cooling efficiency.

[0034] Preferably, the upper curved arm 204, the lower curved arm 205, the steel wire 206 and the drum 207 form a stirring unit, and the impeller 2 includes multiple stirring units, which are evenly distributed circumferentially along the rotating main shaft 208.

[0035] Setting up multiple agitation units can achieve the goal of agitation multiple times a week, thereby improving agitation efficiency and heat dissipation.

[0036] The rotation axis of impeller 2 coincides with the central axis of heat dissipation tank 1. Aligning the central axes avoids excessive friction and compression caused by eccentricity, while ensuring consistent agitation efficiency.

[0037] Preferably, the fixed crossbar includes an inlet crossbar 4 and an outlet crossbar 3, both of which are provided with mounting protrusions, and the two ends of the rotating spindle 208 are provided with mounting holes that cooperate with the mounting protrusions.

[0038] In this embodiment of the invention, the spiral blade 203 is located downstream of the agitation unit along the gas flow direction. Furthermore, the agitation unit is spaced apart from the inlet of the heat dissipation tank 1.

[0039] A type of air-cooled heat sink includes multiple air-cooled heat sink units, and the multiple air-cooled heat sink units are arranged in an array along a set direction.

[0040] It should be noted that:

[0041] The outer diameter of the roller is Φ1, the inner diameter is Φ2, and its wall thickness is L. g = (Φ1-Φ2) / 2, the roller is made of lightweight plastic material. The finned plate has multiple circular flow channels, the diameter of which is Φ a The impeller has helical blades at the tail end in the direction of airflow, with an outer diameter of Φ. y The length along the central axis of the impeller is L. y Its spiral has n turns. y The diameter of the steel wire is Φ s The steel wires are evenly arranged in a circle with the impeller shaft as the center, and the diameter of the circle is Φ. D The steel wire can be stainless steel wire or made of carbon fiber.

[0042] Φ a The value satisfies the following conditions

[0043] Φ amin <Φ a <Φ amax ;

[0044] in:

[0045] Φ amin =Φ D +2×L g +Φs ;

[0046] Φ amax =Φ D +Φ s +2×(Φ2-Φ s )+2×L g ;

[0047] 2. The value of Φ1 satisfies the following conditions

[0048] Since the roller is used to disrupt the boundary layer on the fin surface, and the thickness of the boundary layer is δ, if the roller diameter Φ1 is too large, the boundary layer air cannot pass over the roller and flow efficiently to the mainstream area when the roller rolls, which will reduce the heat dissipation effect. If the roller diameter Φ1 is too small, the disruption and disturbance effect on the boundary layer is weak, and the heat dissipation effect is not optimal.

[0049] Therefore, Φ1 should satisfy:

[0050] δ / 2 < Φ1 < 2δ;

[0051] The value of δ is calculated using the following formula:

[0052]

[0053] Where, Φ a Let be the diameter of the circular channel, and Re be the Reynolds number.

[0054] Re is calculated according to the following formula:

[0055]

[0056] In the formula: ρ is the density of air; U is the air velocity; Φ a denoted as the diameter of the circular channel; μ is the dynamic viscosity of air.

[0057] 3. The impeller parameters should meet the following conditions.

[0058] 0.2 <n y <1.

[0059] 4. Other conditions

[0060] To ensure proper operation and ease of manufacturing, the following requirements must be met:

[0061] Φ2 / 2<Φ s <3Φ2 / 4.

[0062] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this invention can be freely combined and used.

Claims

1. A wind-cooled heat dissipation unit, characterized in that, include: The heat dissipation groove (1) has an open groove structure with a circular cross-section; Fixed horizontal bars are installed at both ends of the heat dissipation groove (1); The impeller (2) is rotatably disposed in the heat dissipation groove (1), and both ends of the impeller (2) are rotatably connected to the fixed crossbar; The impeller (2) includes: The rotating spindle (208) is rotatably connected to the fixed crossbar at both ends; The spiral blade (203) is set on the rotating main shaft (208) and the spiral blade (203) is located in the heat dissipation groove (1). The spiral blade (203) can drive the rotating main shaft (208) to rotate in the heat dissipation groove (1). The upper curved arm (204) and the lower curved arm (205) are arranged on the rotating main shaft (208) and spaced apart from the helical blade (203), and the upper curved arm (204) and the lower curved arm (205) are spaced apart from each other; Steel wire (206) is connected to the upper curved arm (204) and the lower curved arm (205); The roller (207) is rotatably mounted on the steel wire (206) and the roller (207) can contact the inner wall of the heat dissipation groove (1); The upper curved arm (204), the lower curved arm (205), the steel wire (206) and the drum (207) form a stirring unit. The impeller (2) includes a plurality of the stirring units, and the plurality of the stirring units are evenly distributed circumferentially along the main rotating shaft (208).

2. The air-cooled heat dissipation unit according to claim 1, characterized in that, The rotation axis of the impeller (2) coincides with the central axis of the heat sink (1).

3. The air-cooled heat dissipation unit according to claim 1, characterized in that, The fixed crossbar includes an inlet crossbar (4) and an outlet crossbar (3). Both the inlet crossbar (4) and the outlet crossbar (3) are provided with mounting protrusions. The two ends of the rotating spindle (208) are provided with mounting holes that cooperate with the mounting protrusions.

4. The air-cooled heat dissipation unit according to claim 1, characterized in that, Along the gas flow direction, the helical blade (203) is located downstream of the agitation unit.

5. The air-cooled heat dissipation unit according to claim 1, characterized in that, Along the gas flow direction, the agitation unit is spaced apart from the inlet of the heat dissipation tank (1).

6. A wind-cooled heat sink, comprising multiple wind-cooled heat dissipation units, characterized in that, The air-cooled heat dissipation unit is the air-cooled heat dissipation unit according to any one of claims 1 to 5, and a plurality of the air-cooled heat dissipation units are arranged in an array along a set direction.

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