Flexible capillary structure and heat dissipation unit with elastic deformation

Abstract

The present invention provides a flexible capillary structure and a heat dissipation unit with elastic deformation. The heat dissipation unit includes a heat dissipation body and a flexible capillary structure. The heat dissipation body has an upper plate, a chamber, and a lower plate. The flexible capillary structure is disposed in the chamber and includes a capillary main body and a plurality of extendable portions that can be elastically deformed under pressure and extend outward from one side of the capillary main body to support the capillary main body. The plurality of extendable portions and the capillary main body jointly define an axial displacement space. One of the capillary main body and the plurality of extendable portions contacts the inner side of the upper plate or the lower plate.

Description

Technical Field

[0001] The present invention relates to a flexible capillary structure and a heat dissipation unit with elastic deformation, and particularly to a flexible capillary structure with a function of being compressed and deformed and a heat dissipation unit with elastic deformation. Background Art

[0002] The existing heat pipe is directly welded (combined) by two upper and lower metal plate members to form a vacuum cavity. The inner wall of the cavity (i.e., the chamber) is provided with a capillary structure (such as a sintered powder body, a grid body, a fiber body or a groove, etc.) and a working fluid, etc., so that the heat pipe can quickly conduct the heat of the heat source to a large area for cooling, making the heat pipe become a high-performance heat dissipation device.

[0003] However, the overall structure of the existing heat pipe is fixed and cannot be changed according to requirements. For example, the height in the chamber of the heat pipe is fixed and cannot be axially displaced and changed, and the capillary structure is also directly formed horizontally and fixed on the inner wall of the chamber, unable to generate axial displacement deformation. When the heat pipe is fixedly attached to a heat generating element (such as a processor or a graphics processor) on a circuit board (such as a motherboard) in an electronic device (such as a computer, a notebook computer, 3C electronic products or a communication device), because a plurality of other electronic components (including passive electronic components) are also arranged around the heat generating element of the circuit board, the size of the installation space range where the heat pipe is assembled and attached to the heat generating element will be limited, and there is a certain height difference between the heat generating element and other surrounding electronic components. Therefore, during assembly, it often occurs that the overall volume of the heat pipe is larger than the installation space of the heat generating element and cannot be assembled and used, or the heat pipe cannot be assembled and used due to obstruction by other surrounding electronic components, and a heat pipe with an elastic height difference cannot be provided to meet various requirements. Summary of the Invention

[0004] An object of the present invention is to provide a flexible capillary structure with a function of being compressed and deformed.

[0005] Another object of the present invention is to provide a flexible capillary structure that can increase the structural elasticity.

[0006] Another object of the present invention is to provide a heat dissipation unit with elastic deformation having a function of being compressed and deformed.

[0007] Another object of the present invention is to provide a heat dissipation unit with elastic deformation that can increase the structural elasticity.

[0008] To achieve the above object, the present invention provides a flexible capillary structure applied to a heat dissipation unit. The flexible capillary structure includes a capillary main body and a plurality of extendable parts that can be elastically deformed under pressure. The plurality of extendable parts extend outward from one side of the capillary main body to support the capillary main body, and the plurality of extendable parts and the capillary main body jointly define an axial displacement space.

[0009] For the flexible capillary structure described above, wherein: the plurality of extendable parts are formed in a ring shape on a bottom side of the capillary main body, and each of the plurality of extendable parts has a fixed end and a free end. The fixed end of the plurality of extendable parts is connected to the corresponding bottom side of the capillary main body, and the free end extends horizontally outward with an abutting part.

[0010] For the flexible capillary structure described above, wherein: the flexible capillary structure is formed by braiding a plurality of metal or non-metal or plastic filaments to form a porous liquid-absorbing capillary structure.

[0011] For the flexible capillary structure described above, wherein: the metal filaments are copper filaments, stainless steel filaments, aluminum filaments, nickel filaments, titanium filaments, alloy wires or combinations thereof.

[0012] For the flexible capillary structure described above, wherein: the shape of the flexible capillary structure is a flower-like body, a claw-like body or an arch-like body.

[0013] The present invention further provides a heat dissipation unit with elastic deformation, including a heat dissipation body and a flexible capillary structure body. The heat dissipation body has an upper plate, a chamber and a lower plate covering the upper plate. A working fluid is filled in the chamber. The flexible capillary structure is arranged in the chamber. The flexible capillary structure includes a capillary main body and a plurality of extendable parts that can be elastically deformed under pressure. The plurality of extendable parts extend outward from one side of the capillary main body to support the capillary main body, and the plurality of extendable parts and the capillary main body jointly define an axial displacement space. One of the capillary main body and the plurality of extendable parts contacts the inner side of the upper plate or the lower plate.

[0014] For the heat dissipation unit with elastic deformation described above, wherein: the upper plate is provided with a base part and a side part that can be elastically deformed under pressure. The side part extends outward from one side of the base part.

[0015] For the heat dissipation unit with elastic deformation described above, wherein: the plurality of extendable parts are formed in a ring shape on a bottom side of the capillary main body, and each of the plurality of extendable parts has a fixed end and a free end. The fixed end of the plurality of extendable parts is connected to the corresponding bottom side of the capillary main body, and a horizontally outward extending abutting part is provided at the free end. The free end and the abutting part contact the inner side of the upper plate or the lower plate, and the capillary main body relatively contacts the inner side of the lower plate or the upper plate.

[0016] The heat dissipation unit with elastic deformation, wherein: it further includes another flexible capillary structure, and the another flexible capillary structure is arranged mutually or alternately or correspondingly or at intervals with the flexible capillary structure, and the another flexible capillary structure and the flexible capillary structure jointly define and utilize the axial displacement space.

[0017] The heat dissipation unit with elastic deformation, wherein: it further includes an elastic support member, the elastic support member is arranged in the axial displacement space, and the elastic support member is provided with a support top and a support bottom, the support top is in contact with the inner side of the base, and the support bottom abuts against a bottom side of the capillary main body.

[0018] The heat dissipation unit with elastic deformation, wherein: the flexible capillary structure is formed by braiding a plurality of metal or non-metal or plastic filaments into a porous liquid-absorbing capillary structure, and the metal filaments are copper filaments, stainless steel filaments, aluminum filaments, nickel filaments, titanium filaments, alloy wires or combinations thereof.

[0019] The heat dissipation unit with elastic deformation, wherein: the heat dissipation body is a heat pipe or a heat plate.

[0020] The heat dissipation unit with elastic deformation, wherein: a capillary structure is arranged in the chamber, and the capillary structure is arranged on one inner side of the upper plate or the lower plate of the chamber or is arranged on the entire inner side of the chamber.

[0021] Therefore, through the design of the present invention above, it can achieve the functions of being compressible and deformable and having capillary force, and effectively achieve the effect of increasing the structural elasticity. Brief Description of the Drawings

[0022] Figure 1A It is a three-dimensional schematic diagram of the flexible capillary structure of the first embodiment of the present invention.

[0023] Figure 1B It is of the present invention Figure 1A Top view schematic diagram of the flexible capillary structure.

[0024] Figure 2 It is an exploded three-dimensional schematic diagram of the heat dissipation unit of the second embodiment of the present invention.

[0025] Figure 3 It is an assembled three-dimensional schematic diagram of the heat dissipation unit with elastic deformation of the second embodiment of the present invention.

[0026] Figure 4A It is a schematic diagram of the heat dissipation unit of the second embodiment of the present invention in the restored original (undeformed under pressure) state.

[0027] Figure 4B It is a schematic diagram of the heat dissipation unit of the second embodiment of the present invention in the deformed under pressure state.

[0028] Figure 4C It is a schematic cross-sectional view of the heat dissipation unit combination in another alternative embodiment of the second embodiment of the present invention.

[0029] Figure 5A It is a schematic cross-sectional view of the heat dissipation unit combination in another alternative embodiment of the second embodiment of the present invention.

[0030] Figure 5B is of the present invention Figure 5A exploded perspective view of the heat dissipation unit.

[0031] Figure 6A It is an exploded perspective view of the heat dissipation unit in another alternative embodiment of the second embodiment of the present invention.

[0032] Figure 6B It is a schematic view of the heat dissipation unit in another alternative embodiment of the second embodiment of the present invention in a restored original (undeformed under pressure) state.

[0033] Figure 6C It is a schematic view of the heat dissipation unit in another alternative embodiment of the second embodiment of the present invention in a deformed under pressure state.

[0034] Figure 7 It is an exploded perspective view of the heat dissipation unit of the third embodiment of the present invention.

[0035] Figure 8 It is a schematic cross-sectional view of the heat dissipation unit of the third embodiment of the present invention.

[0036] Explanation of reference numerals: Flexible capillary structures 11, 13; Capillary main bodies 111, 131; Extension parts 112, 132; Fixed ends 1121, 1321; Free ends 1123, 1323; Contact parts 11231, 13231; Axial displacement space 114; First and second heights H1, H2; Heat dissipation unit 2; Heat dissipation body 20; Evaporation part 201; Condensation part 202; Upper plate 21; Base part 211; Side part 212; Lower plate 22; Chamber 23; Capillary structure 24; Elastic support 25; Support top 251; Support bottom 252. Detailed Description of the Invention

[0037] The above objects, structures and functional characteristics of the present invention will be described with reference to the preferred embodiments shown in the accompanying drawings.

[0038] The present invention provides a flexible capillary structure. Please refer to Figure 1A It is a three-dimensional schematic view of the flexible capillary structure of the first embodiment of the present invention; Figure 1BIt is a top view schematic diagram of the flexible capillary structure in FIG. 1 of the present invention. The flexible capillary structure 11 is applied in a heat dissipation unit (such as a heat pipe or a heat plate, not shown in the figure). The flexible capillary structure 11 can be a sintered powder or a grid body or a woven body or a fibrous body, and its material can be a metal, a non-metal or a plastic material. In this embodiment, a woven body is selected for illustration. It is formed by weaving a plurality of metal wires into a porous liquid-absorbing capillary structure. The metal wires are copper wires, stainless steel wires, aluminum wires, nickel wires, titanium wires, alloy wires or a combination thereof; or a porous capillary structure formed by plastic molding. And the appearance shape of the flexible capillary structure 11 in this embodiment is in the shape of a flower-like body, and from Figure 1A a top view, it can be seen that it is like a chrysanthemum-like shape, but it is not limited to this. In specific implementation, the shape of the flexible capillary structure 11 can also be a claw-like body or an arch-like body or other shapes. And the flexible capillary structure 11 has a capillary main body 111 and a plurality of extendable parts 112 that can be elastically deformed under pressure. The capillary main body 111 and the extendable parts 112 in this embodiment are respectively shown as a circular flower center disk shape (such as the flower center of a chrysanthemum) and a petal shape (such as the petals of a chrysanthemum). Wherein the capillary main body 111 and the plurality of extendable parts 112 are integrally formed. Of course, in other embodiments, the capillary main body 111 and the extendable parts 112 can be two independent components, and the capillary main body 111 and the extendable parts 112 are combined into one body through a connection method (such as adhesion, welding or embedding) to form the aforementioned flexible capillary structure 11. In addition, since the capillary main body 111 and the plurality of extendable parts 112 are not integrally formed, their materials (metal, non-metal, plastic) and capillary types (sintered powder or grid body or woven body or fibrous body) can be selected to be the same or different in any combination.

[0039] In another embodiment, the capillary main body 111 and the extendable parts 112 are respectively in a polygonal shape (such as a triangle, a pentagon or a rectangle or an irregular shape).

[0040] The plurality of extension parts 112 are formed by extending outward and downward from one side of the capillary main body 111, that is, the plurality of extension parts 112 are arranged in an equidistant or non-equidistant interval around the bottom side of the capillary main body 111 to support the capillary main body 111. And the plurality of extension parts 112 are provided with a fixed end 1121 and a free end 1123. The fixed end 1121 of the plurality of extension parts 112 is connected to the bottom side of the corresponding capillary main body 111, and a contact part 11231 extends horizontally outward from the free end 1123. The contact part 11231 has the effects of increasing the contact area (including the increase of capillary force) and increasing the stability. And the plurality of extension parts 112 and the capillary main body 111 jointly define an axial displacement space (height) 114, and the axial displacement space 114 is used for the capillary main body 111 and the part of the plurality of extension parts 112 connected to the capillary main body 111 to axially displace (such as upward displacement, downward displacement or reciprocating displacement) within the axial displacement space 114.

[0041] Therefore, when an axial external force (such as a downward external force) is applied to the top side of the capillary main body 111 of the flexible capillary structure 11, the capillary main body 111 is subjected to the downward external force (such as collision or the tight force of being assembled with a radiator) and displaces downward within the axial displacement space 114. At the same time, the plurality of extension parts 112 will also receive the axial external force transmitted from the capillary main body 111, causing the free end 1123 of the plurality of extension parts 112 to elastically deform under pressure and displace outward (that is, displace in the direction away from the axial displacement space 114). At this time, the flexible capillary structure 11 is in a compressed deformation state. When there is no axial external force applied to the top side of the capillary main body 111, the plurality of extension parts 112 displace inward in the direction of the axial displacement space 114 by virtue of their own elastic restoring force. At the same time, the plurality of extension parts 112 drive the capillary main body 111 thereon to displace upward in the axial displacement space 114, so that the flexible capillary structure 11 returns to its original state (that is, the flexible capillary structure 11 is in an uncompressed deformation state). Therefore, through the flexible capillary structure 11 of the present invention, it has the function of being compressible and deformable, and can quickly return the working liquid condensed in a condensation part (not shown in the figure) of the heat dissipation unit to an evaporation part (not shown in the figure) of the heat dissipation unit by virtue of the capillary force of the capillary main body 111 and the extension parts 112 of the flexible capillary structure 11 when being compressed and deformed or not being compressed and deformed.

[0042] Therefore, through the design of the flexible capillary structure 11 of the present invention, it can achieve the functions of being compressible and deformable and having capillary force, and effectively achieve the effect of increasing the structural elasticity.

[0043] Please refer to Figure 2 is an exploded perspective view of a heat dissipation unit according to a second embodiment of the present invention; Figure 3 is an assembled perspective view of a heat dissipation unit according to a second embodiment of the present invention;Figure 4A Schematic diagram of the heat dissipation unit of the second embodiment of the present invention in a restored original (undeformed under pressure) state; Figure 4B Schematic diagram of the heat dissipation unit of the second embodiment of the present invention in a deformed under pressure state; Figure 4C Combined cross-sectional schematic diagram of the heat dissipation unit of the second embodiment of the present invention in another alternative embodiment; Figure 5A Combined cross-sectional schematic diagram of the heat dissipation unit of the second embodiment of the present invention in another alternative embodiment; Figure 5B is of the present invention Figure 5A exploded three-dimensional schematic diagram of the heat dissipation unit; Figure 6A Exploded three-dimensional schematic diagram of the heat dissipation unit of the second embodiment of the present invention in another alternative embodiment; Figure 6B Schematic diagram of the heat dissipation unit of the second embodiment of the present invention in another alternative embodiment in a restored original (undeformed under pressure) state; Figure 6C Schematic diagram of the heat dissipation unit of the second embodiment of the present invention in another alternative embodiment in a deformed under pressure state. As Figure 2 , Figure 3 , Figure 4A , Figure 4B shown, and with reference to Figure 1A , Figure 1B , in this embodiment, the flexible capillary structure 11 of the above embodiments is mainly disposed in a heat dissipation unit 2 with elastic deformation. The heat dissipation unit 2 is represented as a heat pipe that can be deformed under pressure in this embodiment, but is not limited thereto. In specific implementation, the heat dissipation unit 2 is a heat plate that can be deformed under pressure. And the heat dissipation unit 2 includes a heat dissipation body 20 and a flexible capillary structure 11. The structure and function of the flexible capillary structure 11 in this embodiment are the same as those of the flexible capillary structure 11 in the above first embodiment, so they will not be repeated here.

[0044] The heat dissipation body 20 has an upper plate 21, a chamber 23, a lower plate 22 covering the upper plate 21, an evaporation part 201 and a condensation part 202. The upper plate 21 and the lower plate 22 are made of either a metal material or a ceramic. The metal material is gold, silver, copper, iron, aluminum, stainless steel, titanium or an alloy. The evaporation part 201 and the condensation part 202 of the heat dissipation body 20 are respectively located on the lower plate 22 and the upper plate 21. The evaporation part 201 (i.e., the lower plate 22) is attached to a heat generating element (such as a central processing unit, a graphics processing unit, a north-south bridge chip or other heat sources; not shown in the figure), and the heat generating element is in contact and attached to the outside of the evaporation part 201 of the capillary body 111 corresponding to the flexible capillary structure 11. The upper plate 21 is provided with a base part 211 and a laterally compressible and elastically deformable side part 212. The elastic side part 212 extends outward from one side of the base part 211 and is used to be axially compressed or elastically restored. In this embodiment, the side part 212 extends outward and downward from the outer peripheral side of the base part 211. The bottom end of the side part 212 is attached and closely fitted to an inner side corresponding to the lower plate 22, so that the chamber 23 of the heat dissipation body 20 forms a vacuum state.

[0045] The chamber 23 is filled with a working fluid (such as pure water, methanol, or refrigerant). In this embodiment, the inner walls of the chamber 23 located at the evaporation part 201 and the condensation part 202 (i.e., the inner sides of the upper and lower plates 22) are not provided with a capillary structure (such as a sintered metal powder body or a woven mesh). The flexible capillary structure 11 is disposed in the chamber 23. One of the capillary main body 111 and the plurality of extension parts 112 of the flexible capillary structure 11 contacts the inner side of the upper plate 21 or the lower plate 22. In this embodiment, a top side of the capillary main body 111 directly contacts and connects to the inner side of the lower plate 22. The free ends 1123 of the plurality of extension parts 112 and the abutting parts 11231 directly contact the inner side of the base part 211 of the upper plate 21. By contacting the inner side of the upper plate 21 through the abutting parts 11231 with a large contact surface, the contact area between the two can be effectively increased, thereby increasing the capillary force and the stability of the contact between the two. Therefore, by using the capillary main body 111 of the flexible capillary structure 11 as the capillary structure in the evaporation part 201 of the heat dissipation body 20, after the working liquid on the capillary main body 111 in the evaporation part 201 absorbs the heat on the heating element and turns into an evaporated working liquid (or a gaseous working liquid), until the condensed working liquid (or a liquid working liquid) on the condensation part 202 returns quickly to the capillary main body 111 in the lower evaporation part 201 by the capillary force of the plurality of extension parts 112 and the abutting parts 11231 thereon, and a little part of the working liquid on the condensation part 202 can drip back to the evaporation part 201 by gravity. Therefore, by virtue of multiple reflux paths, the condensed working liquid can quickly reflux, effectively avoiding dry burning of the evaporation part 201 and achieving the effect of improving the heat dissipation cycle. In addition, in the present invention, by not providing a capillary structure on the inner sides of the upper and lower plates 22, the vapor space in the chamber can be effectively increased, so as to effectively improve the effect of vapor-liquid circulation. In an embodiment, the top side of the capillary main body 111 of the flexible capillary structure 11 directly contacts and connects to the inner side of the upper plate 22, and the free ends 1123 of the plurality of extension parts 112 directly connect and contact the inner side of the lower plate 22.

[0046] When an axial external force (such as a downward external force) is applied to the outer surface of the base 211 of the upper plate 21 of the heat dissipation body 20, the base 211 of the upper plate 21 is subjected to a downward external force (such as collision or the tight force of assembling with the radiator), and thus downwardly displaces in the chamber 23 towards the lower plate 22. At this time, the elastic side portion 212 will also receive the axial external force transmitted from the base 211, causing the side portion 212 to elastically deform and displace downward in the chamber 23 along with the base 211. Meanwhile, the free ends 1123 of the plurality of extension portions 112 in the chamber 23 will receive the downward external force transmitted from the base 211, causing the free ends 1123 of the plurality of extension portions 112 and the abutting portions 11231 to elastically deform under pressure and displace from the inner side of the base 211 towards the side portion 212. Moreover, the free ends 1123 of the plurality of extension portions 112 and the abutting portions 11231 contact the inner side of the side portion 212. At this time, the heat dissipation body 20 descends from a first height H1 of the axial displacement space 114 to a second height H2 and assumes a compressed deformation state (such as Figure 4B ). When the base 211 of the upper plate 21 is no longer subjected to the axial external force, the heat dissipation body 20 is restored to its original state by the elastic restoring force of the side portion 212 (that is, the upper plate 21 of the heat dissipation body 20 is in an uncompressed deformation state (such as Figure 4A ), and the flexible capillary structure 11 in the chamber 23 returns to the uncompressed deformation state through the plurality of extension portions 112 (such as Figure 4A ), that is, the heat dissipation body 20 rises from the second height H2 of the axial displacement space 114 and is restored to the first height H1.

[0047] In an alternative embodiment, a horizontally extending capillary portion (not shown in the figure) is provided on the peripheral side of the capillary main body 111 of the flexible capillary structure 11. The horizontally extending capillary portion horizontally extends outward from the peripheral side of the capillary main body 11 adjacent to the fixed end 1121 to the inner side of the evaporation portion 201 (that is, the inner side of the lower plate 22). The capillary main body 111 and the horizontally extending capillary portion fill the entire inner side of the evaporation portion 201 of the chamber 23, so that the capillary force of the horizontally extending capillary portion can quickly return the condensed working liquid to the evaporation portion 201.

[0048] In another alternative embodiment, a capillary structure 24 is provided inside the chamber 23. The capillary structure 24 is a sintered metal powder body, a woven mesh, a fibrous body, a groove, or any combination of the foregoing. The capillary structure 24 is disposed on the inner side of the upper plate 21 or the lower plate 22 of the chamber 23 or on the inner sides of both the upper and lower plates 21 and 22 (i.e., the entire inner side of the chamber 23). The capillary structure 24 is in contact connection with the plurality of extension portions 112 or the capillary main body 111. For example, the capillary structure 24 is disposed on the inner side of the upper plate 21 of the chamber 23, and the free ends 1123 of the plurality of extension portions 112 and the abutting portions 11231 thereon are in contact connection with the capillary structure 24 of the upper plate 21. Or the capillary structure 24 is disposed on the inner sides of both the upper and lower plates 21 and 22 of the chamber 23 (as shown in Figure 4C ), the top side of the capillary main body 111 is directly in contact connection with the capillary structure 24 of the lower plate 22, and the free ends 1123 of the plurality of extension portions 112 and the abutting portions 11231 thereon are directly in contact connection with the capillary structure 24 of the upper plate 21, so as to effectively supply the condensed working liquid to quickly flow back, so as to avoid dry burning of the evaporation part 201 and achieve the effect of rapid heat dissipation cycle.

[0049] In another alternative embodiment, referring to Figure 5A 、 Figure 5B , the heat dissipation unit 2 further includes another flexible capillary structure 13. The another flexible capillary structure 13 is arranged mutually or alternately or correspondingly or at intervals with the flexible capillary structure 11. The structure of the another flexible capillary structure 13 (including another capillary main body 131, and the fixed ends 1321, free ends 1323 and abutting portions 13231 of the plurality of another extension portions 132), the appearance shape and the function are the same as the structure (i.e., including the capillary main body 111 and the extension portion 132), the appearance shape and the function of the foregoing flexible capillary structure 11, which will not be repeated here. The main thing is that the another capillary main body 131 contacts the inner side of the condensation part (i.e., the inner side of the upper plate 22), the plurality of another extension portions 132 contact the inner side of the evaporation part 201 (i.e., the inner side of the lower plate 22), and the another flexible capillary structure 13 and the flexible capillary structure 11 jointly define and use the axial displacement space 114. Therefore, the two flexible capillary structures 11 and 13 are used as the capillary structures in the evaporation part 201 and the condensation part 202 of the heat dissipation body 20, so that the condensed working liquid can quickly flow back to effectively achieve the effect of improving the heat dissipation cycle.

[0050] In another alternative embodiment, referring to Figure 6A 、 Figure 6B 、 Figure 6C, the elastically deformable heat dissipation unit 2 further includes an elastic support member 25 disposed within the axial displacement space 114 for supporting the flexible capillary structure 11 and the base 211. The elastic support member 25 is provided with a support top 251 and a support bottom 252. The support top 251 is in contact with the inner side of the base 211 facing it, and the support bottom 252 abuts against the bottom side of the capillary main body 111. Through the elastic support member 25, the structural elasticity and buffering effect of the heat dissipation body 20 can be increased, and the elastic restoring force of the elastic support member 25 can also assist the flexible capillary structure 11 and the base 211 of the upper plate 21 to displace upward and quickly return to the original state (that is, the upper plate 21 of the heat dissipation body 20 and the flexible capillary structure 11 are both in an undeformed state under pressure, such as Figure 6B ).

[0051] Therefore, through the design of the flexible capillary structure 11 provided in the elastically deformable heat dissipation unit 2 of the present invention, the functions of being compressible and having capillary force can be achieved simultaneously. In addition to effectively increasing the overall structural elasticity of the heat dissipation body 20, the heat dissipation unit 2 can be used as long as it is within the height difference range between the first and second heights H1 and H2 during assembly to meet various requirements. In addition, the heat dissipation unit 2 can be applied to an electronic device (such as a smart phone or a computer), a server, a communication device, or an industrial device. When the base 211 of the upper plate 21 of the heat dissipation unit 2 is assembled with a radiator having a plurality of fins, it will be fastened to the radiator (not shown in the figure) by a fastener (not shown in the figure) to apply a downward pressing force on the radiator. At this time, the heat dissipation unit 2 will receive the aforementioned downward pressing force through the base 211 and be displaced downward under pressure within the chamber 23, and the side portion 212 will also receive the downward pressing force transmitted from the base 211 and be elastically deformed and displaced downward within the chamber 23 until the fastener is fixed on the radiator, so that the bottom surface of the radiator is closely and flatly attached to the outer surface of the base 211 of the upper plate 21 of the heat dissipation unit 2. Therefore, the elastically deformable heat dissipation unit 2 of the present invention can achieve the effects of bearing pressure and resisting compression.

[0052] Please refer to Figure 7 is an exploded perspective view of the heat dissipation unit according to the third embodiment of the present invention; Figure 8 is a cross-sectional view of the heat dissipation unit according to the third embodiment of the present invention, and with reference to FIG. 1, Figure 2。The structure, connection relationship, non-compressed deformation (or compressed deformation) state, and its functions of the heat dissipation unit 2 (including the heat dissipation body 20 and the flexible capillary structure 11) of this embodiment are generally the same as those of the heat dissipation unit 2 (including the heat dissipation body 20 and the flexible capillary structure 11) with elastic deformation in the foregoing second embodiment, and will not be repeated here. This embodiment mainly changes the setting direction of the flexible capillary structure 11 in the foregoing second embodiment Figure 2 such that the capillary main body 111 of the flexible capillary structure 11 contacts the inner side of the condensation part 202 (i.e., the inner side of the upper plate 22), and the plurality of extension parts 112 contact the capillary structure 24 on the inner side of the evaporation part 201 (i.e., the inner side of the lower plate 22) as shown in Figure 7 . Therefore, through the capillary force of the capillary main body 111, the plurality of extension parts 112, and the abutting part 11231 extending horizontally thereon, the condensed working liquid is quickly returned to the capillary structure 24 in the lower evaporation part 201, and continuous vapor-liquid circulation heat dissipation is carried out.

[0053] Therefore, through the design of the flexible capillary structure 11 provided in the heat dissipation unit 2 with elastic deformation of the present invention, the functions of being compressible and having capillary force can be achieved, and the structural elasticity of the entire heat dissipation body 20 can be effectively increased.

Claims

1. A flexible capillary structure is applied to a heat dissipation unit. It is characterized in that: The flexible capillary structure includes a capillary main body and a plurality of extending parts capable of being elastically deformed under pressure. The plurality of extending parts extend outward from one side of the capillary main body to support the capillary main body, and the plurality of extending parts and the capillary main body jointly define an axial displacement space for the capillary main body and the parts where the plurality of extending parts are connected to the capillary main body to displace axially.

2. The flexible capillary structure according to claim 1, It is characterized in that: The plurality of extending parts are formed in a ring shape on a bottom side of the capillary main body, and each of the plurality of extending parts has a fixed end and a free end. The fixed end of the plurality of extending parts is connected to the corresponding bottom side of the capillary main body, and a contact part extends horizontally outward from the free end.

3. The flexible capillary structure according to claim 1, It is characterized in that: The flexible capillary structure is woven by a plurality of metal or non-metal or plastic filaments to form a porous liquid-absorbing capillary structure.

4. The flexible capillary structure according to claim 3, It is characterized in that: The metal filaments are copper filaments, stainless steel filaments, aluminum filaments, nickel filaments, titanium filaments, alloy wires or combinations thereof.

5. The flexible capillary structure according to claim 1, It is characterized in that: The shape of the flexible capillary structure is a flower-like body, a claw-like body or an arch-like body.

6. An elastically deformable heat dissipation unit, It is characterized in that, including: A heat dissipation body having an upper plate, a chamber and a lower plate covering the upper plate, and a working fluid is filled in the chamber; and A flexible capillary structure is disposed in the chamber. The flexible capillary structure includes a capillary main body and a plurality of extending parts capable of being elastically deformed under pressure. The plurality of extending parts extend outward from one side of the capillary main body to support the capillary main body, and the plurality of extending parts and the capillary main body jointly define an axial displacement space for the capillary main body and the parts where the plurality of extending parts are connected to the capillary main body to displace axially. One of the capillary main body and the plurality of extending parts contacts the inner side of the upper plate or the lower plate.

7. The elastically deformable heat dissipation unit according to claim 6, It is characterized in that: The upper plate is provided with a base part and a side part capable of being elastically deformed under pressure. The side part extends outward from one side of the base part.

8. The elastically deformable heat dissipation unit according to claim 6, It is characterized in that: The plurality of extending parts are formed in a ring shape on a bottom side of the capillary main body, and each of the plurality of extending parts has a fixed end and a free end. The fixed end of the plurality of extending parts is connected to the corresponding bottom side of the capillary main body, and a contact part extends horizontally outward from the free end. The free end and the contact part contact the inner side of the upper plate or the lower plate, and the capillary main body contacts the inner side of the lower plate or the upper plate relatively.

9. The elastically deformable heat dissipation unit according to claim 6, It is characterized in that: It further includes another flexible capillary structure. The another flexible capillary structure is arranged mutually, or alternately, or correspondingly, or at intervals with the flexible capillary structure. The another flexible capillary structure and the flexible capillary structure jointly define and use the axial displacement space.

10. The heat dissipation unit with elastic deformation according to claim 6, characterized in that: it further includes an elastic support member disposed within the axial displacement space, and the elastic support member is provided with a support top and a support bottom. The support top is in contact with the inner side of the base, and the support bottom abuts against a bottom side of the capillary body.

11. The heat dissipation unit with elastic deformation according to claim 6, characterized in that: the flexible capillary structure is woven by a plurality of metal or non-metal or plastic filaments to form a porous liquid-absorbing capillary structure, wherein the metal filaments are copper filaments, stainless steel filaments, aluminum filaments, nickel filaments, titanium filaments, alloy wires or combinations thereof.

12. The heat dissipation unit with elastic deformation according to claim 6, characterized in that: the heat dissipation body is a heat pipe or a heat plate.

13. The heat dissipation unit with elastic deformation according to claim 6, characterized in that: a capillary structure is provided in the chamber, and the capillary structure is disposed on one inner side of the upper plate or the lower plate of the chamber or arranged on the entire inner side of the chamber.

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