Radiator

Abstract

Provided is a heat sink which exhibits excellent cooling characteristics even for a high-calorific-value heat-generating body by reducing thermal resistance when heat is transferred from the heat-generating body to a heat-receiving part of a heat pipe. A heat sink is provided with: a heat pipe having a heat receiving part thermally connected to a heat generating body; and a heat exchange unit thermally connected to the heat dissipation unit of the heat pipe, the heat pipe having an internal space that communicates from the heat receiving unit to the heat dissipation unit and in which a working fluid is sealed, the portion of the heat receiving unit facing the heat generating body being a flat portion that is flat in the direction in which the heat generating body extends, and the heat exchange unit being configured so that the working fluid flows into the flat portion. And the flat part is in direct contact with the heating body.

Description

Technical Field

[0001] This utility model relates to a heat sink that uses the heat transfer function of a heat pipe to transfer heat from a heat-generating element to a heat exchange section, thereby cooling the heat-generating element. Background Technology

[0002] With the increasing functionality of electronic devices in recent years, many components, including heat-generating elements such as electronic parts, are being packed into these devices at increasingly higher densities. Furthermore, as electronic devices become more functional, the heat generated by these heat-generating elements is also increasing. Heat sinks are sometimes used to cool these heat-generating elements. Additionally, to reliably cool high-heat-generating elements even when placed in confined spaces, heat pipes are sometimes used to connect to the heat-generating element, utilizing the heat transfer function of the heat pipes to cool the heat sink.

[0003] As a heat sink in which multiple heat pipes are thermally connected to a heat-generating element, for example, a heat sink has been proposed in which multiple heat sinks are arranged parallel to each other at a predetermined interval at one end of the heat pipes and are orthogonal to the axial direction of the heat pipes. The gaps between the heat sinks are vented in a certain direction to dissipate heat from the heat sinks. A flat plate portion is provided at the upper end in a direction orthogonal to the airflow direction of the heat sinks, and ventilation holes are provided in the flat plate portion (Patent Document 1).

[0004] In Patent Document 1, by providing ventilation holes in the flat portion of the heat sink, the heat exchange rate using air between the heat sinks is improved, thereby increasing the heat dissipation efficiency of the radiator. Furthermore, in Patent Document 1, the other end of the heat pipe is fitted into a recess formed on the surface of a flat heated block, thereby contacting and fixing it to the heated block. The heating element, which is to be cooled, is connected to the back of the heated block. In Patent Document 1, by using the heated block, the stability of the thermal connection between the other end of the heat pipe and the heating element is obtained. Therefore, in Patent Document 1, the other end of the heat pipe is thermally connected to the heating element, which is to be cooled, via the heated block. According to the above, the heat generated from the heating element is first transferred to the heated block, and then transferred from the heated block to the other end of the heat pipe.

[0005] However, in Patent Document 1, the heated portion of the heat pipe is thermally connected to the heating element via a heated block, thus increasing the thermal resistance when transferring heat from the heating element to the heated portion of the heat pipe. Furthermore, to stably fix the other end of the heat pipe to the heated block, it is welded to a recess in the heated block; therefore, due to the presence of a solder layer, the thermal resistance when transferring heat from the heated block to the other end of the heat pipe increases. Therefore, in Patent Document 1, there is a need to improve the cooling characteristics of the radiator.

[0006] In addition, Patent Document 1 requires the preparation of a separate heating block, which increases the number of components.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Publication No. 2003-229523 Utility Model Content

[0010] Problems to be solved by the utility model

[0011] In view of the above, the purpose of this utility model is to provide a heat sink that can exert excellent cooling characteristics for heat-generating elements with high heat output by reducing the thermal resistance when transferring heat from the heat-generating element to the heated part of the heat pipe.

[0012] Technical solutions to the problem

[0013] The structural essence of this utility model is as follows.

[0014] [1] A radiator comprising: a heat pipe having a heated portion thermally connected to a heat-generating element; and a heat exchange portion thermally connected to the heat dissipation portion of the heat pipe.

[0015] The heat pipe has an internal space that connects the heated part to the heat dissipated part and is sealed with a working fluid.

[0016] The portion of the heated part opposite the heating element is a flat portion that extends along the extension direction of the heating element.

[0017] The flat portion is in direct contact with the heating element.

[0018] [2] According to the radiator described in [1], wherein,

[0019] The flat portion extends along the heat transport direction of the heat pipe and the heat pipe extends radially.

[0020] [3] According to the radiator described in [1] or [2], wherein,

[0021] The flat portion has a cutting portion that is being machined.

[0022] [4] According to the radiator described in [3], wherein,

[0023] The cutting portion extends to a corner in the radial direction of the heat pipe, thereby cutting off at least a portion of the R portion formed at the corner.

[0024] [5] According to the radiator described in [1] or [2], wherein,

[0025] The heated part has a flat portion.

[0026] The flat portion has a flat cross-sectional shape in the direction orthogonal to the heat transport direction of the heat pipe, and the flat portion has a height direction and a thickness direction, with the portion in the thickness direction of the flat portion having the flat portion.

[0027] [6] According to the radiator described in [5], wherein,

[0028] The flat portion in the thickness direction of the flat portion has a cutting portion that has been machined.

[0029] [7] According to the radiator described in [1] or [2], wherein,

[0030] A plurality of heat pipes are provided, the plurality of heat pipes are arranged radially along the heated portion, and the flat portions of the plurality of heat pipes are arranged on the same plane.

[0031] [8] The radiator according to [1] or [2], wherein,

[0032] A plurality of heat pipes are provided, and the plurality of heat pipes are arranged radially along the heat-receiving section, with adjacent heat pipes in direct contact with each other in the heat-receiving section.

[0033] [9] According to the radiator described in [7], wherein,

[0034] The flat portions of all of the plurality of heat pipes are in direct contact with the heating element.

[0035]

[10] According to the radiator described in [1] or [2], wherein,

[0036] The plurality of heat pipes are provided, the plurality of heat pipes including: a first heat pipe having a first shape in the radial cross-sectional shape of the heated portion; and a second heat pipe having a second shape in the radial cross-sectional shape of the heated portion that is different from the first shape.

[0037]

[11] According to the radiator described in

[10] , wherein,

[0038] The heat transfer characteristics of the first heat pipe are higher than those of the second heat pipe.

[0039]

[12] According to the radiator described in

[10] , wherein,

[0040] The heated portions of the first heat pipe and the heated portions of the second heat pipe are arranged radially along the heat pipe, with the heated portion of the first heat pipe being arranged in a direction further outward than the heated portion of the second heat pipe.

[0041]

[13] According to the radiator described in [1] or [2], wherein,

[0042] The heat pipe has a curved portion that bends away from the flat portion in a direction extending from the heated portion along the length of the heat pipe.

[0043] Utility model effect

[0044] In the heat sink of this invention, the portion of the heat pipe's heated section opposite the heating element is a flat portion that extends along the direction of the heating element. This flat portion directly contacts the heating element, thus stably connecting the heating element to the flat portion of the heated section. Therefore, even without a heating block, the thermal connection between the heated section of the heat pipe and the heating element is stable. Consequently, according to the heat sink of this invention, the thermal resistance during heat transfer from the heating element to the heated section of the heat pipe can be reduced, thus providing excellent cooling characteristics even for high-heat-generating elements.

[0045] According to the radiator of this utility model, the flat portion extends along the heat transport direction of the heat pipe and the heat pipe extends radially, thus enabling more reliable and stable thermal connection between the heated portion of the heat pipe and the heat-generating element.

[0046] According to the heat sink of this invention, the flat portion has a machined cutting portion, thereby further improving the flatness of the flat portion and reducing the thermal resistance during heat transfer from the heat-generating element to the heat-receiving portion of the heat pipe. Furthermore, when the flat portion of the heat pipe is machined, cutting marks are formed on the flat portion, making it possible to visually determine the presence or absence of the cutting portion.

[0047] During the flattening process of forming the flat portion, an R-shaped portion is formed at the corner of the flat portion in the radial direction of the heat pipe. According to the radiator of this invention, the cutting portion of the flat portion extends to the corner in the radial direction of the heat pipe, and at least a portion of the R-shaped portion formed at the corner is cut off. As a result, the area ratio of the flat portion increases at the location of the heated portion opposite to the heat-generating element, thereby further reducing the thermal resistance when transferring heat from the heat-generating element to the heated portion of the heat pipe.

[0048] According to the radiator of this utility model, the heat-receiving part has a flat part, the cross-sectional shape of the flat part in the direction orthogonal to the heat transport direction of the heat pipe is flat, and the flat part has a height direction and a thickness direction. The part in the thickness direction of the flat part has a flat part, so that multiple heat pipes can be thermally connected to the heat-generating element that is to be cooled without increasing the installation space of the heat-receiving part of the radiator.

[0049] According to the radiator of this invention, a plurality of heat pipes are provided, arranged radially along the heated portion, with the flat portions of the heat pipes arranged on the same plane. This ensures stable thermal connection between the heated portions of the heat pipes and the heating element, even with a plurality of heat pipes. Therefore, the thermal resistance during heat transfer from the heating element to the heated portions of the heat pipes can be reduced.

[0050] According to the radiator of this utility model, a plurality of heat pipes are provided, and the plurality of heat pipes are arranged radially along the heat-receiving part. Adjacent heat pipes are in direct contact with each other in the heat-receiving part, so that the heat-receiving parts of the plurality of heat pipes can transfer heat to each other, thereby making the heat load of the plurality of heat pipes uniform.

[0051] According to the heat sink of this utility model, the flat portions of all the plurality of heat pipes are in direct contact with the heating element, which can further reduce the thermal resistance when transferring heat from the heating element to the heated portion of the heat pipes.

[0052] According to the heat sink of this invention, a plurality of heat pipes include: a first heat pipe having a first cross-sectional shape in the radial direction of the heated portion; and a second heat pipe having a second cross-sectional shape in the radial direction of the heated portion that is different from the first shape, thereby enabling adjustment of the difference in heat transfer characteristics between the first and second heat pipes. Therefore, according to the heat sink of this invention, even if the heating element experiences temperature unevenness such as hot spots, it can still exhibit excellent cooling characteristics.

[0053] According to the heat sink of this invention, the heat pipe has a curved portion extending away from the flat portion in the direction beyond the heated portion along its length. This allows the heat pipe to avoid confined spaces and extend beyond the heated portion, even when the heating element is placed in a small space. Therefore, according to the heat sink of this invention, excellent cooling characteristics can be achieved even for heating elements placed in confined spaces. Attached Figure Description

[0054] Figure 1 This is a perspective view of the radiator of the first embodiment of this utility model.

[0055] Figure 2 This is a top view of the radiator of the first embodiment of this utility model.

[0056] Figure 3 This is a front view taken from one end of the radiator in the first embodiment of the present invention.

[0057] Figure 4This is an explanatory diagram showing a schematic view of the bottom surface of one end of the radiator according to the first embodiment of the present invention.

[0058] Figure 5 This is an explanatory diagram showing the radial cross-sectional shape of the heat pipes provided in the radiator of the first embodiment of the present invention.

[0059] Figure 6 This is an explanatory diagram showing a general outline of one end of the radiator of the second embodiment of the present invention from the front view.

[0060] Figure 7 This is an explanatory diagram showing a general outline of one end of the radiator of the third embodiment of the present invention from the front view.

[0061] Figure 8 This is an explanatory diagram showing a general outline of the bottom surface of one end of the radiator according to the fourth embodiment of the present invention.

[0062] Figure 9 This is an explanatory diagram showing the extended state of the heat pipes in the radiator of the fourth embodiment of the present invention.

[0063] Figure 10 This is an explanatory diagram showing the state of the heat pipes in the radiator before the heated portion forms a flat section.

[0064] Figure 11 This is an explanatory diagram of the heat sink of this utility model, showing the state after the heated portion of the heat pipe in the heat sink has been flattened. Detailed Implementation

[0065] Hereinafter, the heat sink of the first embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of the radiator of the first embodiment of this utility model. Figure 2 This is a top view of the radiator of the first embodiment of this utility model. Figure 3 This is a front view taken from one end of the radiator in the first embodiment of the present invention. Figure 4 This is an explanatory diagram showing a schematic view of the bottom surface of one end of the radiator according to the first embodiment of the present invention. Figure 5 This is an explanatory diagram showing the radial cross-sectional shape of the heat pipes provided in the radiator of the first embodiment of the present invention.

[0066] like Figure 1 , 2As shown, the radiator 1 of the first embodiment includes: a heat pipe 11 having a heated portion (evaporation portion) 22 thermally connected to a heat-generating element 101 that is the object to be cooled by the radiator 1; and a heat exchange portion 40 thermally connected to a heat dissipation portion (condensation portion) 23 of the heat pipe 11. The number of heat pipes can be one or multiple, but the radiator 1 has multiple (eight) heat pipes 11, 11, 11... Furthermore, the heat exchange portion 40 is formed by multiple heat sinks 41 arranged side-by-side.

[0067] The heat pipe 11 is a heat transfer component whose internal space is sealed and depressurized. The internal space of the heat pipe 11 connects the heated part 22 to the heat dissipated part 23 and is sealed with a working fluid (not shown).

[0068] A plurality of heat pipes 11, 11, 11… are each thermally connected to the heating element 101 at one end 12 and thermally connected to the heat exchange section 40 at the other end 13. Therefore, one end 12 of each of the plurality of heat pipes 11, 11, 11… functions as a heated section 22, and the other end 13 functions as a heat dissipation section 23. The length direction connecting one end 12 and the other end 13 of the plurality of heat pipes 11, 11, 11… forms the heat transport direction of the heat pipe 11. In the radiator 1, a heat pipe group 10 is formed by the plurality of heat pipes 11, 11, 11… In the heat pipe group 10, each heat pipe 11 is arranged side-by-side along its radial direction. In the radiator 1, each heat pipe 11 is arranged side-by-side in a row.

[0069] Furthermore, the heated portions 22, 22, 22... of a plurality of heat pipes 11, 11, 11... are arranged side-by-side in a row along the extending direction of the heating element 101. As described above, one end 12 of the heat pipe 11 is arranged side-by-side in a row along the extending direction of the heating element 101. Additionally, one end 12, 12, 12... of the plurality of heat pipes 11, 11, 11... is arranged side-by-side in a row on approximately the same plane. Furthermore, a cover member 110 is installed in the radiator 1 to cover the upper surface of one end 12, 12, 12... of the plurality of heat pipes 11, 11, 11...

[0070] like Figure 2 As shown, in heat pipe 11, the top view of one end 12 is approximately straight, and the top view of the central portion (insulation portion) 14 located between one end 12 and the other end 13 is also approximately straight. The central portion 14 of heat pipe 11 is a part where there is no active heat flow. Therefore, in heat pipe assembly 10, the approximately straight portions from one end 12 to the central portion 14 of heat pipe 11 are arranged laterally.

[0071] In the radiator 1, for the heat pipe 11, a bend 15 is formed at the other end 13 that is thermally connected to the heat exchange section 40, in the length direction of the heat pipe 11. Therefore, the plurality of heat pipes 11, 11, 11... are all roughly L-shaped when viewed from above. In addition, the bend 15 of the heat pipe 11 on the right side bends to the right, while the bend 15 of the heat pipe 11 on the left side bends to the left. That is, the bending directions of the bend 15 are opposite for the heat pipe 11 on the left side and the heat pipe 11 on the right side.

[0072] A plurality of heat pipes 11, 11, 11… are all bent at the bend 15 such that their other ends 13 extend in a direction substantially parallel to the length direction of the heat exchange section 40. The heat exchange section 40 has a plurality of heat sinks 41, 41, 41… arranged side-by-side with the main surface (flat portion) of the heat sink 41 arranged in a direction substantially parallel to the extension direction of one end 12 of the heat pipe 11. The heat sink 41 is a thin, flat plate-shaped component. In the radiator 1, the other end 13 of the heat pipe 11, extending in a direction parallel to the length direction of the heat exchange section 40, reaches the end of the heat exchange section 40 in the length direction.

[0073] like Figure 1 , 2 As shown, the heat exchange section 40 has a generally rectangular shape. The heat exchange section 40 is a structure consisting of a first heat sink group 42 with a generally rectangular shape and a second heat sink group 43 adjacent to the first heat sink group 42 and also with a generally rectangular shape. Both the first heat sink group 42 and the second heat sink group 43 are structures in which a plurality of heat sinks 41, 41, 41… are mounted on a flat support 45 and arranged side-by-side in a direction generally parallel to the length direction of the heat exchange section 40.

[0074] The other end 13 of the heat pipe 11 is inserted between the first heat sink assembly 42 and the second heat sink assembly 43. By arranging the other end 13 between the first heat sink assembly 42 and the second heat sink assembly 43, the heat exchange section 40 is thermally connected to the heat pipe 11.

[0075] like Figure 3 , 4 As shown, in the radiator 1, the portion of the heat-receiving section 22 of the heat pipe 11 that faces the heating element 101 is a flat portion 25 that is flat along the extending direction of the heating element 101. The flat portion 25 extends in a planar shape along the heat transport direction of the heat pipe 11 and in the radial direction of the heat pipe 11. Furthermore, in the radiator 1, the flat portion 25 is a flat surface, so it can directly contact the heating element 101. In the radiator 1, the flat portion 25 of the heat pipe 11 is in direct contact with the heating element 101.

[0076] In the heat sink 1, for the heat pipe assembly 10 formed by a plurality of heat pipes 11, 11, 11..., the plurality of heat pipes 11, 11, 11... are arranged side by side along the radial direction of the heat pipe 11 in the heated portion 22 of the heat pipe 11. Furthermore, the flat portions 25, 25, 25... of the plurality of heat pipes 11, 11, 11... are arranged on the same plane. Therefore, the heat pipe assembly 10 has a flat region 26, which is formed by the plurality of flat portions 25, 25, 25... extending and connecting on the same plane.

[0077] Furthermore, in the radiator 1, adjacent heat pipes 11 are in direct contact with each other in the heated portion 22. That is, in the heated portion 22, the side of the heat pipe 11 along its length is in direct contact with the side of the adjacent heat pipe 11 along its length. Additionally, in the radiator 1, the flat portions 25 of adjacent heat pipes 11 are in direct contact with each other at the corners of their flat portions 25. Based on the above, a plurality of flat portions 25, 25, 25… of the flat region 26 of the heat pipe assembly 10 are continuous on the same plane, forming a continuous flat surface.

[0078] like Figure 3 , 4 As shown, in the radiator 1, the cross-sectional shape of the heat-receiving portion 22 of the heat pipe 11 in the direction orthogonal to the heat transport direction of the heat pipe 11 is a flat shape. That is, the heat-receiving portion 22 of the heat pipe 11 has a flat portion 30, which is a flat shape having a height direction H and a thickness direction T with a size smaller than the height direction H. The portion of the flat portion 30 in the thickness direction T is called a flat portion 25. In addition, the side of the heat pipe 11 in the length direction is the portion in the height direction H of the flat portion 30, and the portion in the height direction H of the flat portion 30 of the heat pipe 11 is in direct contact with the portion in the height direction H of the flat portion 30 of the adjacent heat pipe 11. Furthermore, the radial cross-sectional shapes of the heat-receiving portions 22, 22, 22... of the plurality of heat pipes 11, 11, 11... are all approximately the same.

[0079] like Figure 4 As shown, after the heat pipe 11 used to form the flat portion 25 is flattened, the flat portion 25 can be further machined by cutting to form a cutting portion 31 as needed. The flatness of the flat portion 25 is further improved by having the cutting portion 31, the area where the flat portion 25 has been machined. In the radiator 1, the flat portion 25 is machined, therefore, the flat portion 25 has a cutting portion 31. Furthermore, in the radiator 1, after forming the heat pipe group 10 consisting of a plurality of heat pipes 11, 11, 11… arranged side by side, the flat portion 25 is machined. The cutting portion 31 has cutting marks and also has characteristics such as a glossy finish compared to the uncut portion 32.

[0080] In the heat sink 1, the portion of the flat portion 30 in the thickness direction T has a flat portion 25, and therefore the portion of the flat portion 30 in the thickness direction T has a cut portion 31 after machining. The cut portion 31 can be formed entirely in the flat portion 25, or it can be formed only in a part of the flat portion 25, such as the portion of the flat portion 25 that is thermally connected to the heat source 101 and its vicinity (the portion that is in direct contact with the heat source 101 and its vicinity). From the viewpoint of improving the thermal connection between the flat portion 25 and the heat source 101, the lower the flatness of the cut portion 31, the better. Furthermore, the flatness is a value obtained by contact three-dimensional measurement.

[0081] exist Figure 4 For ease of explanation, the cutting portion 31 is assumed to be formed only in and around the portion of the flat portion 25 that is thermally connected to the heating element. Alternatively, the cutting portion 31 may or may not be formed on the bottom surface of the cover member 110. Figure 4 For ease of explanation, the cutting portion 31 located on the bottom surface of the cover member 110, which is on the same plane as the flat portion 25, is designed to extend continuously from the cutting portion 31 of the heat pipe 11 to a portion of the bottom surface of the cover member 110. Therefore, even if the heating element thermally connected to the flat portion 25 of the heat pipe 11 is a large-sized element extending to the cover member 110, the thermal connection between the flat portion 25 of the heat pipe 11 and the heating element is excellent.

[0082] like Figure 5 As shown, during the flattening process used to form the flat portion 25 in the heat pipe 11, an R-shaped portion is formed at the corner 16 of the flat portion 25 in the radial direction of the heat pipe 11. However, in the radiator 1, the cutting portion 31 extends to the corner 16 in the radial direction of the heat pipe 11, thereby cutting off at least a portion of the R-shaped portion formed at the corner 16. Therefore, at least a portion of the R-shaped portion formed at the corner 16 of the heat pipe 11, close to the flat portion 25, is flattened. According to the above, in the heat pipe 11, the flat portion 25 is widened by forming the cutting portion 31.

[0083] The wall thickness of the container of heat pipe 11 can be appropriately selected according to the usage conditions of heat sink 1. Since a cutting portion 31 is formed in the flat portion 25 of heat pipe 11, the cutting portion 31 of the flat portion 25 is slightly thinner than the non-cutting portion 32 of heat pipe 11.

[0084] The heating element 101 only needs to be thermally connected to the flat portion 25 of the heat pipe 11. In the heat sink 1, the heating element 101 is thermally connected to the flat portion 25 of the heat pipe 11 in such a way that the flat portions 25, 25, 25... of a plurality of heat pipes 11, 11, 11... are all in direct contact with the heating element 101.

[0085] The material of the container used in the heat pipe 11 is not particularly limited; for example, copper, copper alloy, aluminum, aluminum alloy, stainless steel, etc., are acceptable. Furthermore, the working fluid sealed in the container of the heat pipe 11 can be appropriately selected based on its compatibility with the container material; for example, water, fluorocarbons, cyclopentane, ethylene glycol, and mixtures thereof are acceptable. Additionally, the material of the heat sink 41 is not particularly limited; for example, metals such as copper and copper alloys are acceptable.

[0086] Next, an example of how to use the radiator 1 according to the first embodiment will be described. A heat pipe assembly 10 of the radiator 1 is arranged directly above and near the heating element 101, such that the flat portions 25, 25, 25... of a plurality of heat pipes 11, 11, 11... are all in direct contact with the heating element 101. Heat released from the heating element 101 is directly transferred to the flat portion 25 formed at one end 12 of the heat pipe 11. At this time, the flat portion 25 functions as the heat receiving portion 22 of the heat pipe 11. The heat transferred to one end 12 of the heat pipe 11 is transferred from one end 12 to the other end 13 of the heat pipe 11 through the heat transport function of the heat pipe 11. The heat transferred to the other end 13 of the heat pipe 11 is transferred from the other end 13 of the heat pipe 11 to the heat exchange portion 40 having a plurality of heat sinks 41. At this time, the other end 13 of the heat pipe 11 functions as a heat dissipation portion. The heat transferred to the heat exchange section 40 is released from the heat exchange section 40 to the external environment of the radiator 1 through the heat exchange function (heat dissipation function) of the heat exchange section 40, thereby cooling the heat-generating element 101.

[0087] As described above, the portion of the heat-receiving section 22 of the heat pipe 11 opposite the heating element 101 is a flat portion 25 that is flat along the extending direction of the heating element 101. This allows the heating element 101 to be stably connected to the flat portion 25 of the heat-receiving section 22. Therefore, even without a heating block, the thermal connection between the heat-receiving section 22 of the heat pipe 11 and the heating element 101 can be stable. Thus, in the radiator 1, the thermal resistance during heat transfer from the heating element 101 to the heat-receiving section 22 of the heat pipe 11 can be reduced, resulting in excellent cooling characteristics even for the high-heat-generating heating element 101. Furthermore, in the radiator 1, there is no need to prepare additional connecting / fixing components for the heat pipe 11, such as a heating block, thus reducing the number of components and lowering the manufacturing cost of the radiator 1.

[0088] In particular, in the radiator 1, since the flat portion 25 extends along the heat transport direction of the heat pipe 11 and the heat pipe 11 extends radially, the stability of the thermal connection between the heated portion 22 of the heat pipe 11 and the heat-generating element 101 can be obtained more reliably.

[0089] Furthermore, in the heat sink 1, the flat portion 25 of the heated portion 22 is in direct contact with the heating element 101. Therefore, the stability of the thermal connection between the heated portion 22 and the heating element 101 can be obtained, and the thermal resistance when transferring heat from the heating element 101 to the heated portion 22 can be reduced. As a result, the heating element 101 can exhibit excellent cooling characteristics.

[0090] Furthermore, in the radiator 1, the flat portion 25 has a cut portion 31 with further improved flatness, thereby further improving the thermal connection between the heating element 101 and the heated portion 22 of the heat pipe 11. Therefore, the thermal resistance during heat transfer from the heating element 101 to the heated portion 22 of the heat pipe 11 can be further reduced. In addition, in the radiator 1, the cut portion 31 of the flat portion 25 extends to the corner 16 in the radial direction of the heat pipe 11, and at least a portion of the R portion formed at the corner 16 is cut and flattened. Therefore, in the heated portion 22, at the part opposite to the heating element 101, the area ratio of the flat portion 25 is increased, and the thermal resistance during heat transfer from the heating element 101 to the heated portion 22 can be reduced more reliably.

[0091] Furthermore, in the radiator 1, the heated portion 22 of the heat pipe 11 has a flat portion 30 with a flat cross-sectional shape in a direction orthogonal to the heat transport direction of the heat pipe 11. The portion of the flat portion 30 in the thickness direction T has a flat portion 25. Therefore, multiple heat pipes 11 can be thermally connected to the heat-generating element 101 to be cooled without increasing the installation space of the radiator 1. Therefore, even if the heat-generating element 101 is installed in a small space, the radiator 1 can exhibit excellent cooling characteristics.

[0092] Furthermore, in the radiator 1, the flat portions 25, 25, 25... of a plurality of heat pipes 11, 11, 11... are arranged on the same plane. Therefore, even with a plurality of heat pipes 11, 11, 11..., the stability of the thermal connection between the heated portions 22, 22, 22... of the plurality of heat pipes 11, 11, 11... and the heating element 101 can be obtained. Thus, the thermal resistance when transferring heat from the heating element 101 to the heated portions 22, 22, 22... of the plurality of heat pipes 11, 11, 11... can be reduced, and the heat load of the plurality of heat pipes 11, 11, 11... can be made more uniform.

[0093] Furthermore, in the radiator 1, the heated portions 22, 22, 22... of a plurality of heat pipes 11, 11, 11... are arranged side by side along their radial direction, and adjacent heat pipes 11 are in direct contact with each other through the heated portions 22. Therefore, the heated portions 22, 22, 22... of the plurality of heat pipes 11, 11, 11... can transfer heat to each other, thereby making the heat load of the plurality of heat pipes 11, 11, 11... more uniform.

[0094] In addition, in the heat sink 1, the flat portions 25, 25, 25... of the plurality of heat pipes 11, 11, 11... can all be in direct contact with the heating element 101. Therefore, for all of the plurality of heat pipes 11, 11, 11..., the thermal resistance when transferring heat from the heating element 101 to the heated portion 22 of the heat pipe 11 can be further reduced.

[0095] Next, the radiator of the second embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, since the main structure of the radiator of the second embodiment is the same as that of the radiator of the first embodiment, the same reference numerals will be used to describe the same constituent elements as those of the radiator of the first embodiment. Figure 6 This is an explanatory diagram showing a general outline of one end of the radiator of the second embodiment of the present invention from the front view.

[0096] In the first embodiment, the heat sink 1 is formed by eight heat pipes 11 forming a heat pipe assembly 10, but instead, as shown below... Figure 6 As shown, in the radiator 2 of the second embodiment, a heat pipe group 10 is formed by six heat pipes 11.

[0097] In the radiator of this invention, the number of heat pipes 11 can be appropriately selected based on the heat output, size, and other factors of the heat-generating element 101 to be cooled, as well as the operating conditions of the radiator. For example, compared to the radiator 1 of the first embodiment, the radiator 2 has a reduced number of heat pipes 11 based on operating conditions such as the lower heat output and smaller size of the heat-generating element 101 to be cooled.

[0098] In radiator 2, similar to radiator 1, the cross-sectional shape of heat pipe 11 in the direction orthogonal to its heat transport direction is flat. That is, the heat-receiving part 22 of heat pipe 11 has a flat part 30, which is a flat shape having a height direction and a thickness direction with a size smaller than the height direction. The portion of the flat part 30 in the thickness direction is called a flat part 25.

[0099] In the radiator 2, which reduces the number of heat pipes 11 compared to the radiator 1, the portion of the heated section 22 opposite the heating element 101 is also a flat portion 25 that extends along the direction of the heating element 101. This allows the heating element 101 to be stably connected to the flat portion 25 of the heated section 22. Therefore, even without connecting / fixing components for the heat pipes 11 such as heating blocks, the stability of the thermal connection between the heated section 22 of the heat pipe 11 and the heating element 101 can be achieved. Furthermore, in the radiator 2, the heated section 22 of the heat pipe 11 is in direct contact with the heating element 101. Therefore, in the radiator 2, the thermal resistance during heat transfer from the heating element 101 to the heated section 22 of the heat pipe 11 can also be reduced.

[0100] Next, the radiator of the third embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, since the radiator of the third embodiment has the same main structure as the radiators of the first and second embodiments, the same reference numerals will be used to describe the same constituent elements as those of the radiators of the first and second embodiments. Figure 7 This is an explanatory diagram showing a general outline of one end of the radiator of the third embodiment of the present invention from the front view.

[0101] In the first embodiment of the radiator 1, the radial cross-sectional shapes of the heated portions 22, 22, 22... of the plurality of heat pipes 11, 11, 11... are all approximately the same, but instead, as... Figure 7 As shown, in the heat sink 3 of the third embodiment, the radial cross-sectional shape of the heated portion 22, 22, 22... which becomes a plurality of heat pipes 11, 11, 11... varies among the plurality of heat pipes 11, 11, 11...

[0102] In the radiator 3, a plurality of heat pipes 11, 11, 11… are formed by a first heat pipe 11-1 and a second heat pipe 11-2, wherein the heat transfer characteristics of the first heat pipe and the second heat pipe are different. Specifically, in the radiator 3, the plurality of heat pipes 11, 11, 11… include: a first heat pipe 11-1, whose radial cross-sectional shape in the heated portion 22 is a first shape; and a second heat pipe 11-2, whose radial cross-sectional shape in the heated portion 22 is a second shape different from the first shape. Based on the above, in the radiator 3, the radial cross-sectional shape of the heat pipes 11 in the heated portion 22 can be multiple (two types). In the radiator 3, for ease of explanation, the first heat pipe 11-1 in the six heat pipes 11, 11, 11… is two, and the second heat pipe 11-2 is four.

[0103] In the radiator 3, the heated portion 22 of the first heat pipe 11-1 and the heated portion 22 of the second heat pipe 11-2 are arranged side by side along the radial direction of the heat pipe 11, with the heated portion 22 of the first heat pipe 11-1 positioned further outward than the heated portion 22 of the second heat pipe 11-2. As described above, the heated portion 22 of the second heat pipe 11-2 is inserted between the heated portions 22 of the first heat pipe 11-1.

[0104] In the radiator 3, the radial cross-sectional area of ​​the first heat pipe 11-1 is larger than that of the second heat pipe 11-2. Therefore, the heat transfer characteristics of the first heat pipe 11-1 are higher than those of the second heat pipe 11-2. In addition, the radial cross-sectional shape of the heated portion 22 of the first heat pipe 11-1 is wider and lower than that of the heated portion 22 of the second heat pipe 11-2.

[0105] In radiator 3, similarly to radiators 1 and 2, the cross-sectional shape of the first heat pipe 11-1 in the direction orthogonal to its heat transport direction is flat. That is, the heated portion 22 of the first heat pipe 11-1 has a flat portion 30, which has a height direction and a thickness direction whose size is smaller than the height direction dimension. The portion of the flat portion 30 in the thickness direction is called a flat portion 25. Similarly, the cross-sectional shape of the second heat pipe 11-2 in the direction orthogonal to its heat transport direction is flat. That is, the heated portion 22 of the second heat pipe 11-2 has a flat portion 30, which is a flat shape in the height direction and a thickness direction whose size is smaller than the height direction dimension. The portion of the flat portion 30 in the thickness direction is called a flat portion 25.

[0106] In the radiator 3, the difference in heat transfer characteristics between the first heat pipe 11-1 and the second heat pipe 11-2 can be adjusted. Therefore, even if temperature unevenness such as hot spots occurs on the heating element 101, by thermally connecting the first heat pipe 11-1 with relatively high heat transfer characteristics to the hot spot and the second heat pipe 11-2 with relatively low heat transfer characteristics to the non-hot spot, the heated part 22 can be miniaturized, and excellent cooling characteristics can be achieved for the heating element 101 that generates temperature unevenness.

[0107] In the radiator 3, where the heat pipes 11 with different radial cross-sectional shapes having heated portions 22 are connected to the heat pipes 11, the heated portion 22, which is opposite to the heat-generating element 101, is also flat along the extending direction of the heat-generating element 101. Therefore, even without connecting / fixing components such as heated blocks, the thermal connection between the heated portion 22 of the heat pipe 11 and the heat-generating element 101 can be stable. Furthermore, in the radiator 3, the heated portion 22 of the heat pipe 11 is in direct contact with the heat-generating element 101. Therefore, in the radiator 3, the thermal resistance during heat transfer from the heat-generating element 101 to the heated portion 22 of the heat pipe 11 can be reduced.

[0108] Next, the radiator of the fourth embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, since the main structure of the radiator of the fourth embodiment is the same as that of the radiators of the first to third embodiments, the same reference numerals will be used to describe the same constituent elements as those of the radiators of the first to third embodiments. Figure 8 This is an explanatory diagram showing a general outline of the bottom surface of one end of the radiator according to the fourth embodiment of the present invention. Figure 9 This is an explanatory diagram showing the extended state of the heat pipes in the radiator of the fourth embodiment of the present invention.

[0109] like Figure 8 , 9As shown, in the radiator 4 of the fourth embodiment, the heat pipe 11 has a curved portion 50 in the portion 51 extending from the heated portion 22 along the length direction of the heat pipe 11, other than the heated portion 22. The curved portion 50 is provided near the boundary between the heated portion 22 and the heat insulation portion 14 in the radiator 4. The curved portion 50 is stepped, forming a stepped portion. The stepped curved portion 50 bends along the height direction H of the heated portion 22 of the heat pipe 11.

[0110] As described above, in the radiator 4, the heat insulation portion 14 of the heat pipe 11 extends towards a position higher than the heat-receiving portion 22 of the heat pipe 11, and the heat dissipation portion (not shown) of the heat pipe 11 is positioned higher than the heat-receiving portion 22 of the heat pipe 11. Furthermore, in the radiator 4, a curved portion 50 is provided near the tip 52 of one end 12 of the heat pipe 11, curving away from the flat portion 25. The curved portion 50 near the tip 52 of one end 12 is also stepped, forming a stepped portion. The stepped curved portion 50 near the tip 52 of one end 12 also curves along the height direction H of the heat-receiving portion 22 of the heat pipe 11. Therefore, the tip 52 of one end 12 is positioned higher than the heat-receiving portion 22 of the heat pipe 11.

[0111] In the heat sink 4, the portion of the flat portion 25 in the heat pipe 11 that faces the heat-generating element 101 protrudes toward the heat-generating element 101. On the other hand, the top end 52 of the end 12 that does not face the heat-generating element 101, the heat insulation portion 14, and the heat dissipation portion are positioned at a position that moves away from the flat portion 25 facing the heat-generating element 101 in the height direction H.

[0112] In the radiator 4, the flat portion 25 is also machined, so the flat portion 25 has a cutting portion 31. In addition, the cutting portion 31 located on the bottom surface of the cover member 110, which is on the same plane as the flat portion 25, extends continuously with the cutting portion 31 of the heat pipe 11 to a part of the bottom surface of the cover member 110.

[0113] In the radiator 4, the heat pipe 11 has a curved portion 50 at its portion 51 extending from the heated portion 22 along its length direction, outside the heated portion 22. Furthermore, by having a curved portion 50 near the tip 52 of one end 12 that bends away from the flat portion 25, the heat pipe 11 can avoid confined spaces and extend beyond the heated portion 22 even when the heat-generating element 101 is placed in a narrow space. Therefore, in the radiator 4, even when the heat-generating element 101 is placed in a narrow space, it can exhibit excellent cooling characteristics.

[0114] Furthermore, even in the heat sink 4 where a stepped bend 50 is formed on the heat pipe 11, the portion of the heated portion 22 opposite the heating element 101 is a flat portion 25 that runs along the extending direction of the heating element 101. This allows the heating element 101 to be stably connected to the flat portion 25 of the heated portion 22. Therefore, even without connecting / fixing components such as a heating block, the thermal connection between the heated portion 22 of the heat pipe 11 and the heating element 101 can be stable. Additionally, in the heat sink 4, the heated portion 22 of the heat pipe 11 is in direct contact with the heating element 101. Therefore, in the heat sink 4, since the thermal resistance during heat transfer from the heating element 101 to the heated portion 22 of the heat pipe 11 can be reduced, excellent cooling characteristics can be achieved for the heating element 101.

[0115] Next, the method for forming a flat portion 25 on the heated portion 22 of the heat pipe 11 will be described. Here, the method for forming the flat portion 25 using the radiator 1 of the first embodiment will be described. Furthermore, Figure 10 This is an explanatory diagram showing the state before a flat portion is formed on the heated part of the heat pipes in the radiator. Figure 11 This is an explanatory diagram of the heat sink of this invention, showing the state after a flat portion is formed on the heat-receiving part of the heat pipes.

[0116] First, a heat pipe with a radial cross-sectional shape of a circle is prepared, and at least the portion corresponding to the heated part is flattened to create a heat pipe 211 with a flattened portion 30. Next, as... Figure 10 As shown, a heat pipe 211 with a flat portion 30 is inserted into a cover member 110, forming a plurality of (in) Figure 10 The heat pipe assembly 210 consists of eight heat pipes 211, 211, 211... At this time, the portion of the heat pipe 211 opposite the heating element has a protrusion 212 that is part of the flat portion 30 protruding from the bottom surface of the cover member 110.

[0117] Next, as Figure 11 As shown, the protrusion 212 of the heat pipe 11 is planarized to form a flat portion 25. For example, a planarization process can be performed by plastic deformation, which plastically deforms the protrusion 212 toward the cover member 110. Through the planarization process, the flat portion 25 and the bottom surface of the cover member 110 are located on approximately the same plane. By performing the above steps, a radiator 1 with the flat portion 25 formed on the heated portion 22 of the heat pipe 11 can be manufactured.

[0118] Next, other embodiments of the radiator of this utility model will be described.

[0119] In the above embodiments, the portion of the heat-receiving part of the heat pipe that faces the heating element is a flat portion. However, the flat portion may be formed only in the portion of the heat-receiving part of the heat pipe that faces the heating element, or the flat portion may be formed only in the entire heat-receiving part of the heat pipe, or the flat portion may be formed not only in the heat-receiving part of the heat pipe but also in other parts of the heat pipe.

[0120] Furthermore, in the above embodiments, the portion of the heat pipe that is heated in the thickness direction is a flattened portion with a flat shape. However, it is possible that only the heated portion of the heat pipe has the flattened portion, or that the flattened portion is present not only in the heated portion of the heat pipe but also in other portions of the heat pipe. Additionally, in the above embodiments, the portion of the heat pipe that is heated in the thickness direction is a flattened portion. However, if a flattened portion is formed in the portion of the heated portion of the heat pipe opposite the heating element, the radial shape of the heat pipe is not particularly limited; instead, it may have a shape without a flattened portion.

[0121] Industrial availability

[0122] The heat sink of this invention can be used in a wide range of fields, but it can also provide excellent cooling performance for high-heat-generating heat sources installed in confined spaces. Therefore, it can be used, for example, in the field of high-performance electronic components such as servers used in data centers.

[0123] Explanation of reference numerals in the attached figures

[0124] Radiators 1, 2, 3, and 4

[0125] 11 heat pipes

[0126] 12 One end

[0127] 13 The other end

[0128] 22 Heating section

[0129] 23 Heat dissipation section

[0130] 25 flat section

[0131] 30 Flat section

[0132] 31 Cutting section

[0133] 40 Heat Exchange Section

Claims

1. A radiator, wherein, have: A heat pipe having a heated portion thermally connected to a heating element; and The heat exchange section is thermally connected to the heat dissipation section of the heat pipe. The heat pipe has an internal space that connects the heated part to the heat dissipated part and is sealed with a working fluid. The portion of the heated part opposite the heating element is a flat portion that extends along the extension direction of the heating element. The flat portion is in direct contact with the heating element. The system is provided with a plurality of heat pipes, wherein the heat transport characteristics of the first heat pipe are different from those of the second heat pipe.

2. The radiator according to claim 1, wherein, The plurality of heat pipes are provided, the plurality of heat pipes including: a first heat pipe having a first shape in the radial cross-sectional shape of the heated portion; and a second heat pipe having a second shape in the radial cross-sectional shape of the heated portion that is different from the first shape.

3. The radiator according to claim 1 or 2, wherein, The flat portion extends along the heat transport direction of the heat pipe and the heat pipe extends radially.

4. The radiator according to claim 1 or 2, wherein, The flat portion has a cutting portion that is being machined.

5. The radiator according to claim 4, wherein, The cutting portion extends to a corner in the radial direction of the heat pipe, thereby cutting off at least a portion of the R portion formed at the corner.

6. The radiator according to claim 1 or 2, wherein, The heated portion has a flat portion. The flat portion has a flat cross-sectional shape in the direction orthogonal to the heat transport direction of the heat pipe, and the flat portion has a height direction and a thickness direction, with the portion in the thickness direction of the flat portion having the flat portion.

7. The radiator according to claim 6, wherein, The flat portion in the thickness direction of the flat portion has a cutting portion that has been machined.

8. The radiator according to claim 1 or 2, wherein, A plurality of heat pipes are provided, the plurality of heat pipes are arranged radially along the heated portion, and the flat portions of the plurality of heat pipes are arranged on the same plane.

9. The radiator according to claim 1 or 2, wherein, A plurality of heat pipes are provided, and the plurality of heat pipes are arranged radially along the heat-receiving section, with adjacent heat pipes in direct contact with each other in the heat-receiving section.

10. The radiator according to claim 8, wherein, The flat portions of all of the plurality of heat pipes are in direct contact with the heating element.

11. The radiator according to claim 1 or 2, wherein, The heat transfer characteristics of the first heat pipe are higher than those of the second heat pipe.

12. The radiator according to claim 1 or 2, wherein, The heated portions of the first heat pipe and the heated portions of the second heat pipe are arranged radially along the heat pipe, with the heated portion of the first heat pipe being arranged in a direction further outward than the heated portion of the second heat pipe.

13. The radiator according to claim 1 or 2, wherein, The heat pipe has a curved portion that bends away from the flat portion at a location other than the heated portion extending along the length of the heat pipe.

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