Vapor Chambers and Electronic Devices

Abstract

The present application provides a heat spreader and an electronic device, wherein the heat spreader includes: a first shell and a second shell, wherein the first shell is sealed and connected to the second shell and a receiving cavity is formed therebetween; a support column, wherein the support column is fixed between the first shell and the second shell, wherein the position of the first shell close to the heat source is the evaporation end, and the position of the first shell away from the heat source is the condensation end; the length of the cross section of at least part of the support column along the first direction is greater than the length along the second direction, wherein the first direction is the direction from the evaporation end to the condensation end, and the second direction is perpendicular to the first direction. By setting the cross section of at least part of the support column to be a shape that is longer along the direction from the evaporation end to the condensation end, the gaseous working medium flowing from the evaporation end to the condensation end can be guided, which is beneficial to reducing the flow resistance of the support column to the flowing gaseous working medium, ensuring the efficiency of gas-liquid circulation, and further ensuring the heat dissipation effect.

Description

[0001] This application is a divisional application with application number 202310478530.6, application date April 27, 2023, and invention name “Heat spreader and electronic device”. Technical Field

[0002] The present application relates to the field of electronic equipment, and in particular to a vapor chamber and electronic equipment. Background Art

[0003] Vapor chamber (VC), also commonly called temperature chamber, super heat conducting plate or thermal conductive plate, is widely used in integrated devices as an efficient heat dissipation component.

[0004] The heat spreader includes a first shell, a second shell and a capillary structure. The first shell is sealed and connected to the second shell, the capillary structure is located on the second shell, and a support column for supporting the first shell and the capillary structure is provided on one side of the first shell close to the second shell, and a steam channel for the gaseous working medium to flow is formed between adjacent support columns.

[0005] When the distance between the first shell and the second shell is determined, the height of the support column is determined. In order to improve the strength of the heat spreader, the cross-sectional area of ​​the support column can be increased. However, the increase in the cross-sectional area of ​​the support column will increase the resistance of the gaseous working medium during circulation, affecting the efficiency of the gas-liquid circulation and further affecting the heat dissipation effect.

[0006] Therefore, how to reduce the resistance of the support column to the flow of the gaseous working medium to ensure the efficiency of the gas-liquid circulation and further ensure the heat dissipation effect is a technical problem that needs to be solved urgently by technical personnel in this field.

[0007] Application Contents

[0008] The present application provides a vapor chamber to ensure the efficiency of gas-liquid circulation and thus the heat dissipation effect. In addition, the present application also provides an electronic device having the vapor chamber.

[0009] To achieve the above objectives, this application provides the following technical solutions:

[0010] In a first aspect, the present application provides a heat spreader, comprising a first shell and a second shell, the first shell being sealed and connected to the second shell to form a receiving cavity therebetween; a support column, the support column being fixed between the first shell and the second shell, the position of the first shell close to the heat source being the evaporation end, and the position of the first shell far from the heat source being the condensation end; the cross-section of at least part of the support column having a length along a first direction greater than the length along a second direction, wherein the first direction is from the evaporation end to the condensation end, and the second direction is perpendicular to the first direction.

[0011] From the above content, it can be seen that by setting the cross-section of at least part of the support column to be a longer shape in the direction from the evaporation end to the condensation end, the gaseous working medium flowing from the evaporation end to the condensation end can be guided, which is beneficial to reduce the flow resistance of the support column to the flowing gaseous working medium, ensure the efficiency of the gas-liquid circulation, and then ensure the heat dissipation effect.

[0012] In a possible implementation manner, a support column whose cross section has a length along a first direction greater than a length along a second direction satisfies: along the first direction, a width of the support column first increases and then decreases.

[0013] It can be seen from the above content that: setting the cross-section of the support column so that the width first increases and then decreases along the first direction can make the support column streamlined, which is beneficial for the support column to guide the gaseous working medium, further reducing the flow resistance of the support column to the flowing gaseous working medium, ensuring the efficiency of gas-liquid circulation, and then ensuring the heat dissipation effect.

[0014] In one possible embodiment, the support column includes: a first support column, the first support column is located at the evaporation end of the first shell; a second support column, the second support column is located in the middle section between the evaporation end and the condensation end, and the cross-section of the second support column has a length along the first direction greater than the length along the second direction; a third support column, the third support column is located at the condensation end of the first shell.

[0015] In a possible implementation, the first support columns and the second support columns are arranged side by side along the first direction, and the third support columns are arranged alternately along the first direction and / or the second direction.

[0016] It can be seen from the above content that the first support column and the second support column are arranged side by side, which is beneficial to reducing the resistance to the gaseous working medium; the staggered arrangement of the third support column can improve the heat exchange efficiency of the condensation end, thereby ensuring the heat dissipation effect.

[0017] In a possible implementation, a length of a cross section of the first support column and / or a cross section of the third support column along the first direction is greater than a length along the second direction.

[0018] From the above content, it can be seen that increasing the number of guide support columns can further improve the heat exchange efficiency of the condensation end, thereby ensuring the heat dissipation effect.

[0019] In a possible implementation manner, at least one of the first support column, the second support column, and the third support column satisfies: along the first direction, the width first increases and then decreases.

[0020] In one possible embodiment, at least one of the first support column, the second support column and the third support column is an airfoil support column, and the cross-section of the airfoil support column includes: a leading edge and a trailing edge, and the leading edge and the trailing edge are both curved surfaces, and the opening angle of the leading edge is greater than the opening angle of the trailing edge, and the leading edge faces the heat source; a first side edge and a second side edge, and the first side edge and the second side edge are respectively located on both sides of the leading edge and the trailing edge, and connect the leading edge and the trailing edge.

[0021] It can be seen from the above content that the use of wing-shaped support columns is conducive to reducing the resistance of the support columns to the gaseous working medium, ensuring the efficiency of gas-liquid circulation, and further ensuring the heat dissipation effect.

[0022] In a possible implementation manner, the chord length H of the cross section of the airfoil support column and the maximum thickness D of the airfoil support column satisfy: D / H=0.05-0.95.

[0023] In one possible embodiment, at least one of the first support column, the second support column and the third support column is a conical support column, and the cross-section of the conical support column includes: a first guide section, a first connecting section and a second guide section connected in sequence, wherein, along the direction from the first guide section to the second guide section, the width of the first guide section gradually increases, the width of the second guide section gradually decreases, the width of the first connecting section is equal, and the first guide section faces the heat source.

[0024] It can be seen from the above content that the use of conical support columns is conducive to reducing the resistance of the support columns to the gaseous working medium, ensuring the efficiency of gas-liquid circulation, and further ensuring the heat dissipation effect.

[0025] In a possible implementation manner, the first guide segment is triangular, and the third guide segment is semi-elliptical or triangular.

[0026] In a possible implementation manner, the cone angle of the first guide segment ranges from 20° to 80°.

[0027] In a possible implementation, the length of the steam channel formed by adjacent second support columns in the first direction gradually increases from the middle to both sides of the first shell in the second direction.

[0028] It can be seen from the above content that by changing the length of the steam channel formed by the second support column in the first direction, the resistance at both ends of the condensation end and the evaporation end is different, which is conducive to the diffusion of the gaseous working medium, making the distribution of the gaseous working medium more uniform, and effectively improving the heat exchange efficiency.

[0029] In a possible implementation manner, the length of the second support column gradually increases from the middle to both sides of the first shell in the second direction.

[0030] It can be seen from the above content that the length of the steam channel can be changed by changing the length of the second support column in the first direction.

[0031] In a possible implementation, ends of the plurality of second support columns close to the first support column are flush with each other, or a line connecting ends of the plurality of second support columns close to the first support column is V-shaped.

[0032] It can be seen from the above content that by changing the arrangement position of the second support column in the first direction, it is beneficial for the gaseous working medium to diffuse in the second direction, making the distribution of the gaseous working medium more uniform, and effectively improving the heat exchange efficiency.

[0033] In a possible implementation, the first support columns are evenly distributed along the first direction, and the third support columns are staggered at the condensation end.

[0034] In a possible implementation, the density of the support pillars gradually decreases from the heat source to a direction away from the heat source.

[0035] From the above content, it can be seen that by changing the seal of the support column, the resistance at the evaporation end is large and the resistance at the condensation end is small, which is conducive to the diffusion of the gaseous working medium from the evaporation end to the condensation end, making the distribution of the gaseous working medium more uniform and effectively improving the heat exchange efficiency.

[0036] In a possible implementation, the size of the support column gradually decreases from the heat source to a direction away from the heat source.

[0037] From the above content, it can be seen that by changing the seal of the support column, the resistance at the evaporation end is large and the resistance at the condensation end is small, which is conducive to the diffusion of the gaseous working medium from the evaporation end to the condensation end, making the distribution of the gaseous working medium more uniform and effectively improving the heat exchange efficiency.

[0038] In a possible implementation manner, a capillary structure is further included, and the capillary structure is located in the accommodating cavity.

[0039] In a second aspect, the present application provides an electronic device, including a heat spreader, wherein the heat spreader is the heat spreader described above.

[0040] It can be seen from the above content that: since the electronic device includes the above-disclosed heat spreader, it also has all the above-mentioned technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A disassembled side view of a mobile phone provided by the prior art;

[0042] Figure 2 The disassembled front view of the middle frame and the heat spreader of the mobile phone provided by the prior art;

[0043] Figure 3 A front cross-sectional view of a heat spreader provided in the prior art;

[0044] Figure 4 The present invention is a structural schematic diagram of a first shell provided by the prior art.

[0045] Figure 5 A front view of a first structure of a first shell provided in an embodiment of the present application;

[0046] Figure 6 A front view of a second structure of the first housing provided in an embodiment of the present application;

[0047] Figure 7 A front view of a third structure of the first shell provided in an embodiment of the present application;

[0048] Figure 8 A schematic diagram of the structure of a wing-shaped support column provided in an embodiment of the present application;

[0049] Fig. 9 A fourth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0050] Fig.10 A schematic diagram of the structure of the shuttle-shaped support column provided in an embodiment of the present application;

[0051] Fig.11 A fifth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0052] Fig.12 A schematic diagram of the structure of a double-conical support column provided in an embodiment of the present application;

[0053] Fig.13 A simulation diagram of velocity vectors and pressure gradients corresponding to support columns of different shapes provided in an embodiment of the present application;

[0054] Fig.14 A sixth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0055] Fig.15 A seventh structural schematic diagram of the first shell provided in an embodiment of the present application;

[0056] Fig.16 An eighth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0057] Fig.17 A ninth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0058] Fig.18 A tenth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0059] Fig.19 This is an eleventh structural schematic diagram of the first shell provided in an embodiment of the present application;

[0060] Fig. 20 A twelfth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0061] Fig.21 This is a thirteenth structural schematic diagram of the first shell provided in an embodiment of the present application;

[0062] Fig. 22 This is the fourteenth structural schematic diagram of the first shell provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the embodiments of the present application, "one or more" refers to one, two or more; "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0064] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0065] The multiple involved in the embodiments of the present application means greater than or equal to two. It should be noted that in the description of the embodiments of the present application, the words "first", "second", etc. are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0066] With the development of device integration, the heat of the equipment will accumulate, causing a sharp increase in the heat flux density of the integrated equipment. The high heat flux density will affect the reliability of the integrated equipment and cause a poor thermal experience for users. Therefore, effective thermal management methods have become a hot topic in recent years.

[0067] Vapor chamber (VC), also commonly called temperature chamber, super heat conducting plate or thermal conductive plate. Vapor chamber is a highly efficient heat dissipation component widely used in integrated devices. The following content will refer to integrated devices as electronic devices, such as mobile phones, tablet computers and laptops.

[0068] The following combination Figure 1 and Figure 2 Taking mobile phones as an example, the application of heat spreaders in electronic devices is explained in detail. Figure 1 This is a disassembled side view of the phone. Figure 2 This is the main view of the disassembled middle frame and heat spreader of the mobile phone.

[0069] like Figure 1 As shown, the mobile phone includes a display screen 300 , a heat sink 100 , a middle frame 200 , a circuit board 500 , a battery 600 and a rear cover 400 .

[0070] The display screen 300 and the rear shell 400 are respectively fixed on the two sides of the middle frame 200, the heat spreader 100 is fixed on the middle frame 200, and the circuit board 500 and the battery 600 are installed between the middle frame 200 and the rear shell 400. Optionally, the heat spreader 100 can be installed on the side of the middle frame 200 close to the display screen 300, or on the side of the middle frame 200 close to the rear shell 400.

[0071] like Figure 2 As shown, the middle frame 200 has a mounting hole 201, and the heat spreader 100 is installed in the mounting hole 201 by means of a connection method such as a snap connection, a bonding connection or a welding connection, and is connected to the heat spreader 100 by means of a snap connection, a bonding connection or a welding connection. Figure 1 The circuit board 500 is bonded to the mobile phone, and the heat spreader 100 dissipates heat from the heat source components on the circuit board 500 to ensure the stability of the mobile phone performance.

[0072] Specifically, the heat source devices on the circuit board 500 include, but are not limited to, SOC (System on Chip), CPU (Central Processing Unit), GPU (graphics processing unit), inductors, fast charging devices and other devices.

[0073] It should be noted that the heat source device on the circuit board 500 can be considered as the heat source 1000 below.

[0074] The following combination Figure 3 and Figure 4 The specific structure of the heat spreader 100 is shown to illustrate the heat dissipation principle of the heat spreader 100. Figure 3 This is a front cross-sectional view of a heat spreader in the prior art. Figure 4 It is a schematic structural diagram of the first shell 01 of an embodiment of the prior art.

[0075] like Figure 3 As shown, the vapor chamber 100 includes a first shell 01, a second shell 02 and a capillary structure 03. The first shell 01 has a support column 011 and a steam channel 012 on one side thereof close to the second shell 02.

[0076] The first shell 01 is sealed and connected to the second shell 02, for example, by welding. After the first shell 01 and the second shell 02 are connected, a vacuum containing cavity is formed between the two, and the capillary structure 03 is located in the containing cavity. Optionally, the capillary structure 03 is obtained by etching or screen spot welding on the second shell 02. The containing cavity is a flow space for gaseous working fluid, and the capillary structure 03 is a flow space for liquid working fluid.

[0077] The support column 011 is located in the accommodating cavity and abuts against the capillary structure 03, and a steam channel 012 is formed between adjacent support columns 011. The steam channel 012 is connected to the capillary structure 03 to form a circulation channel for the phase change medium. The support column 011 can be obtained on the inner side of the first shell 01 by etching or stamping.

[0078] It should be noted that the phase change working fluid in this article becomes a gaseous working fluid after absorbing heat and becomes a liquid working fluid after dissipating heat. Optionally, the phase change working fluid is water.

[0079] When the heat spreader 100 is assembled with the mobile phone, the side of the second housing 02 away from the first housing 01 contacts the heat source 1000. The part of the accommodating cavity facing the heat source 1000 is the evaporation end, and the part of the accommodating cavity away from the heat source 1000 is the condensation end.

[0080] When the heat spreader 100 is working: the phase change working medium at the evaporation end of the heat spreader 100 absorbs the heat generated by the heat source 1000 and changes into a gaseous working medium. The gaseous working medium flows along the steam channel 012 to the condensation end, and dissipates heat at the condensation end by external forced convection or under the pressure difference between the evaporation end and the condensation end. After the heat is condensed, the phase changes into a liquid working medium, and the liquid working medium flows back to the capillary structure 03; the liquid working medium in the capillary structure 03 flows to the evaporation end under the action of the capillary pressure, undergoes the next phase change, and realizes cyclic cooling. The cyclic cooling process of the heat spreader 100 completes the continuous and rapid heat dissipation of the heat source 1000.

[0081] It should be noted that the support column 011 is provided between the first shell 01 and the capillary structure 03 to support the first shell 01 and the second shell 02 , thereby preventing the vapor chamber 100 from shrinking and blocking the steam channel 012 during vacuuming.

[0082] When the distance between the first shell 01 and the second shell 02 is determined, the height of the support column 011 is determined. In order to improve the strength of the heat spreader 100, the cross-sectional area of ​​the support column 011 can be increased, but the increase in the cross-sectional area of ​​the support column 011 will increase the resistance of the gaseous medium when flowing.

[0083] It should be noted that the cross-sectional area in this article refers to the area of ​​the section of the support column 011 along the radial direction, which can also be understood as the supporting area of ​​the support column 011.

[0084] Combine the following Figure 4 The structure of the first shell 01 shown in the figure 1 is simplified as a rectangular piece. The resistance of the support column 011 is explained by taking one end of the first shell 01 close to the heat source 1000 as the evaporation end and the other end as the condensation end as an example:

[0085] Figure 4 The support columns 011 on the first shell 01 are cylindrical and are evenly distributed on the first shell 01 . Therefore, the resistance of the support columns 011 at various locations on the first shell 01 to the gaseous working medium is the same, and there are steam channels 012 between adjacent support columns 011 .

[0086] It should be noted that the cross section of the support column 011 can also be a square. When the cross section of the support column involved in this article is a rectangular, square, or triangular shape with sharp corners, in the processing process, the preferred solution is to perform rounding. In some embodiments, along the height direction of the support column 011, the size of the support column 011 is variable, but the cross-sectional shape of the support column 011 remains unchanged.

[0087] When the gaseous working medium flows in the steam channel 012, it will constantly collide with the support column 011, causing the support column 011 to generate resistance to the flow of the gaseous working medium. Under the resistance of the support column 011, the flow rate of the gaseous working medium gradually decreases, increasing the time it takes for the gaseous working medium to travel from the evaporation end to the condensation end, which affects the efficiency of the gas-liquid cycle and further affects the heat dissipation effect.

[0088] In order to reduce the resistance of the support column 011 to the gaseous working medium and ensure the efficiency of the gas-liquid circulation, an embodiment of the present application provides a support column for a heat spreader. By changing the shape of the cross-section of the support column and / or the arrangement of the support column on the first shell, the resistance of the support column to the gaseous working medium is reduced, and the uniformity of the distribution of steam in the accommodating chamber is improved, thereby improving the efficiency of the gas-liquid circulation and ensuring the heat dissipation effect.

[0089] In order to make those skilled in the art clearly understand the present application scheme, the following will be combined with the attached examples of the present application. Figures 5 to 7 , clearly and completely describe the technical solutions in the embodiments of the present application.

[0090] in, Figure 5 This is a front view of the first structure of the first shell in the embodiment of the present application. Figure 6 This is a front view of the second structure of the first shell in the embodiment of the present application. Figure 7 This is a front view of the third structure of the first shell in the embodiment of the present application.

[0091] like Figures 5 to 7 As shown, one end of the first shell 1 close to the heat source 1000 is the evaporation end, and the other end is the condensation end, and the middle section is between the evaporation end and the condensation end of the first shell 1. All embodiments herein refer to this description.

[0092] The support column 11 includes a first support column 111, a second support column 112 and a third support column 113. The first support column 111 is located at the evaporation end, the third support column 113 is located at the condensation end, and the second support column 112 is located in the middle section. The space between adjacent support columns 11 is a steam channel 12.

[0093] like Figure 5 As shown, the first support column 111 is a cylindrical support column, and is evenly distributed in a rectangular array at the evaporation end of the first shell 1. The second support column 112 is an airfoil support column, and is evenly distributed in a rectangular array at the middle section of the first shell 1. The third support column 113 is a cylindrical support column, and is evenly distributed in a rectangular array at the condensation end of the first shell 1. The first support column 111, the second support column 112 and the third support column 113 are arranged opposite to each other along the first direction.

[0094] The first direction in this article is the connecting direction of the evaporation end and the condensation end of the first shell 1, and the second direction and the first direction are two perpendicular directions on the first shell of the heat spreader. All embodiments in this article refer to this description.

[0095] Since the shape of the wing-shaped support column has a flow-guiding effect, setting the second support column 112 as an wing-shaped support column can reduce the flow resistance of the second support column 112 to the gaseous working medium, increase the flow speed of the gaseous working medium, improve the efficiency of the gas-liquid circulation, and ensure the heat dissipation effect.

[0096] like Figure 6 As shown, the first support column 111 is a cylindrical support column and is evenly distributed in a rectangular array at the evaporation end of the first shell 1. The second support column 112 is an airfoil support column and is evenly distributed in a rectangular array at the middle section of the first shell 1. The third support column 113 is an airfoil support column and is evenly distributed in a rectangular array at the condensation end of the first shell 1. The first support column 111, the second support column 112 and the third support column 113 are arranged opposite to each other along the first direction.

[0097] In this embodiment, the second support column 112 and the third support column 113 are both set as wing-shaped support columns. Under the guiding effect of the wing-shaped support columns, the flow resistance of the support column 11 to the gaseous working medium can be further reduced, the flow speed of the gaseous working medium can be increased, the efficiency of the gas-liquid circulation can be improved, and the heat dissipation effect can be ensured.

[0098] In summary, Figure 5 and Figure 6 The embodiments shown all reduce the resistance of the support column 11 to the gaseous working medium by changing the shape of the support column 11. In some embodiments, the arrangement of the support column 11 can be further changed to achieve the purpose of reducing the resistance of the support column 11 to the gaseous working medium.

[0099] like Figure 7 As shown, the first support column 111 is a cylindrical support column and is evenly distributed in a rectangular array at the evaporation end of the first shell 1. The second support column 112 is an airfoil support column and is evenly distributed in a rectangular array at the middle section of the first shell 1. The third support column 113 is a cylindrical support column and is staggered at the condensation end of the first shell 1. The first support column 111 and the second support column 112 are arranged side by side along the first direction.

[0100] It should be noted that the staggered arrangement is such that the gaps between the third support pillars 113 in the next row are opposite to the gaps between the third support pillars 113 in the previous row. Of course, the staggered arrangement can also be such that the gaps between the third support pillars 113 in one of two adjacent columns are opposite to the gaps between the third support pillars 113 in the other column. That is, the third support pillars 113 are staggered along the first direction and / or the second direction.

[0101] Since the third support column 113 is located in the condensation section, the gaseous working medium is about to condense into liquid. Therefore, the flow rate of the gaseous working medium flowing to the condensation end is already very low, and further reducing the resistance will not significantly improve the performance of the heat sink.

[0102] Based on the above phenomenon, the staggered arrangement of the third support columns 113 will cause the gaseous working medium to generate disturbance flow at the condensation end, also known as turbulence. Based on the principle that when the fluid flows in turbulent flow, its particles move irregularly, and various quantities in the flow field change disorderly with time and space coordinates, resulting in a small temperature difference between the center of the tube and the wall of the tube, and high heat exchange efficiency, the staggered arrangement of the third support columns 113 can improve the heat exchange efficiency of the condensation end, thereby ensuring the heat dissipation effect.

[0103] The second support column 112 is an airfoil support column, and the flow guiding effect of the airfoil support column can be utilized to reduce the flow resistance of the second support column 112 to the gaseous working medium, improve the efficiency of gas-liquid circulation, and ensure the heat dissipation effect.

[0104] It should be noted that the shape of the support column 11 will directly affect the flow resistance of the gaseous working medium in the containing chamber of the heat spreader, thereby causing a difference in the pressure drop from the evaporation end to the condensation section. The greater the resistance of the support column, the higher the pressure drop in the containing chamber.

[0105] The following will combine the simulation analysis data results to explain Figures 4 to 6 The technical effect of the solution corresponding to the embodiment shown.

[0106] Simulation condition settings: The size of the heat spreader is 100mm*30mm*0.35mm, where the distance between the first shell and the second shell is 0.1mm, which assumes the size of the heat spreader's accommodating cavity; the entry velocity of the gaseous working medium into the accommodating cavity is 5m / s, which assumes the initial velocity of the liquid working medium in the heat spreader turning into the gaseous working medium and flowing into the accommodating cavity; the cross-sectional areas of the support columns with different cross-sectional shapes are all 0.50265mm 2 (The diameter of the cylindrical support column is 0.8 mm); the pressure drop results obtained by simulation are as follows:

[0107] Figure 4 The support columns 011 in the illustrated embodiment are all cylindrical support columns. Figure 4 The average pressure drop inside the heat sink corresponding to the middle support column 011 is 1183 Pa;

[0108] Figure 5 In the embodiment shown, the first support column 111 and the third support column 113 are both cylindrical support columns, and the second support column 112 is an airfoil support column. Figure 5 The average pressure drop inside the heat sink corresponding to the middle support column 11 is 1174pa, which is Figure 4 The corresponding heat sink has a pressure drop benefit of (1174Pa-1183Pa) / 1183Pa*100%=7.6%.

[0109] Figure 6 In the embodiment shown, the first support column 111 is a cylindrical support column, and the second support column 112 and the third support column 113 are both wing-shaped support columns. Figure 6 The average pressure drop inside the heat sink corresponding to the middle support column 11 is 1168pa, which is Figure 4 The corresponding heat sink has a pressure drop benefit of (1183Pa-1168Pa) / 1183Pa*100%=12.67%.

[0110] because Figure 7 The support column 11 in the embodiment shown is Figure 5 On the basis of the support columns 11 in the embodiment shown, the third support columns 113 are arranged in a staggered manner. Figure 5The arrangement of the support columns 11 in the embodiment shown is as follows: Figure 7 The pressure drop gain of the heat sink corresponding to the support column 11 in the embodiment shown does not change much. However, the staggered arrangement of the third support columns 113 can enhance the turbulence of the gaseous medium in the condensation section and improve the heat exchange efficiency of the condensation section.

[0111] From the pressure drop data obtained through simulation, it can be seen that the use of airfoil support columns can effectively reduce the pressure drop and reduce the resistance to the gaseous working fluid, thereby ensuring the heat dissipation effect.

[0112] The above content explains the effect of using wing-shaped support columns. Figure 8 The second support column 112 shown is used as an example to illustrate the shape and size of the wing-shaped support column involved in the embodiment of the present application. Figure 8 It is a front view of the second support column 112.

[0113] like Figure 8 As shown, when the second support column 112 is an airfoil support column, the cross section of the airfoil support column includes a leading edge 1121 , a trailing edge 1122 , a first side edge 1123 and a second side edge 1124 .

[0114] Among them, the leading edge 1121 and the trailing edge 1122 are both arc surfaces, and the opening angle a of the leading edge 1121 is greater than the opening angle b of the trailing edge 1122. The first side edge 1123 and the second side edge 1124 may be arc surfaces symmetrical about the line connecting the leading edge 1121 and the trailing edge 1122. In some embodiments, the first side edge 1123 and the second side edge 1124 may also be arc surfaces with different curvatures, and one of the first side edge 1123 and the second side edge 1124 is closer to a straight line.

[0115] It should be noted that when the first side 1123 and the second side 1124 are arc-shaped surfaces symmetrical about the line connecting the leading edge 1121 and the trailing edge 1122, the second support column 112 is a first airfoil support; when the first side 1123 and the second side 1124 are not arc-shaped surfaces symmetrical about the line connecting the leading edge 1121 and the trailing edge 1122, the second support column 112 is a second airfoil support. The user can select the shape of the second support column 112 according to the flow direction of the gaseous working medium, and the closer the flow direction of the gaseous working medium and the shape of the side of the second support column 112 are to parallelism, the smaller the resistance of the second support column 112.

[0116] Combination Figure 7As shown, when the second support column 112 is processed on the first shell 1, the leading edge 1121 of the second support column 112 faces the evaporation end of the first shell 1, and the trailing edge 1122 of the second support column 112 faces the condensation end of the first shell 1. It can also be understood that: the center line of the second support column 112 is parallel to the first direction. When the gaseous working medium flows to the second support column 112, under the guiding effect of the leading edge 1121, the gaseous working medium is guided to both sides of the second support column 112, and flows to the trailing edge 1122 along the first side edge 1123 and the second side edge 1124 respectively.

[0117] In order to reduce the resistance of the leading edge 1121 to the gaseous working medium, the opening angle a of the leading edge 1121 can be reduced. Optionally, the leading edge 1121 is an elliptical surface, which can reduce the contact area between the leading edge 1121 and the gaseous working medium compared to the arc surface, thereby reducing the resistance of the second support column 112 to the gaseous working medium.

[0118] It should be noted that the smaller the opening angle of the leading edge 1121 and the trailing edge 1122, the smaller the resistance to the gaseous working fluid. Therefore, on the premise of meeting the requirements of the processing technology and the supporting force of the second support column 112, the opening angle a of the leading edge 1121 and the opening angle b of the trailing edge 1122 can be set to as small an angle as possible.

[0119] The angular size of the leading edge 1121 and the trailing edge 1122 is related to the chord length H and the maximum thickness D of the second support column 112, that is, the chord length H and the maximum thickness D of the second support column 112 can be considered as the major axis and the minor axis of the ellipse, and the relationship between the angular size of the leading edge 1121 and the trailing edge 1122 can be determined by the chord length H and the maximum thickness D of the second support column 112.

[0120] The relationship between the chord length H and the maximum thickness D of the cross section of the second support column 112 herein is: D / H=0.05-0.95.

[0121] In some embodiments, the second support column 112 mentioned above may also be in other shapes, for example, the second support column 112 may also be a shuttle support column, a double cone support column or an elliptical support column. Figures 9 to 12 The guiding functions of the second support column 112 being a shuttle-shaped support column and the second support column 112 being a double-conical support column are respectively described.

[0122] in, Fig. 9 is a fourth structural schematic diagram of the first shell, Fig.10 FIG. 1 is a schematic structural diagram of the second support column 112 being a shuttle-shaped support column.

[0123] Fig. 9 The structure of the first housing 1 shown is similar to Figure 7 The structure of the first housing 1 shown is the same, the only difference is the shape of the second support column 112, therefore, Fig. 9The structure of the first housing 1 shown is shown in FIG. Figure 7 The structure of the first shell 1 shown is sufficient and will not be described in detail here.

[0124] like Fig.10 As shown, when the second support column 112 is a shuttle-shaped support column, the cross section of the shuttle-shaped support column includes: a first guide segment 1125 , a first connecting segment 1126 and a second guide segment 1127 .

[0125] The first guide section 1125, the first connecting section 1126 and the second guide section 1127 are sequentially connected as a whole, and optionally, the second support column 112 is integrally formed to ensure the strength of the second support column 112. The first guide section 1125 includes but is not limited to a triangle, and can also be a trapezoid, the first connecting section 1126 is a rectangle, the second guide section 1127 is a semi-ellipse, and along the direction from the first guide section 1125 to the second guide section 1127, the width of the cross section of the second support column 112 first increases and then decreases.

[0126] Combination Fig. 9 As shown, when processing the second support column 112 on the first housing 1, the vertex of the first guide section 1125 faces the first support column 111, and the second guide section 1127 faces the third support column 113. It can also be understood that the center line of the second support column 112 is parallel to the first direction.

[0127] Optionally, the cone angle α of the first guide section 1125 ranges from 20° to 80°. When the gaseous medium flowing from the evaporation end to the second support column 112 contacts the first guide section 1125, the contact area between the gaseous medium and the second support column 112 can be reduced compared to contacting the arc surface of the cylindrical support column.

[0128] It should be noted that in order to reduce the resistance of the second support column 112 to the gaseous working medium, the cone angle α of the first guide section 1125 should be as small as possible; the length L1 of the first connecting section 1126 has little effect on the pressure drop, so its length is not specifically limited; when the horizontal axis length L2 of the second guide section 1127 is less than the thickness H of the second support column 112, the larger the better.

[0129] Fig.11 is a fifth structural schematic diagram of the first shell 1, Fig.12 It is a front view when the second support column 112 is a double-conical support column.

[0130] Fig.11 The structure of the first housing 1 shown is similar to Figure 7 The structure of the first housing 1 shown is the same, the only difference is the shape of the second support column 112, therefore, Fig.11 The structure of the heat sink shown is referenced Figure 7 The structure of the heat spreader shown is sufficient and will not be described in detail here.

[0131] like Fig.12 As shown, when the second support column 112 is a double-conical support column, the cross section of the double-conical support column includes: a third guide segment 1128 , a second connecting segment 1129 and a fourth guide segment 1120 .

[0132] The third guide segment 1128, the second connecting segment 1129 and the fourth guide segment 1120 are sequentially connected as a whole, and optionally, the second support column 112 is integrally formed to ensure the strength of the second support column 112. The third guide segment 1128 is triangular, the second connecting segment 1129 is rectangular, and the fourth guide segment 1120 is triangular, and the thickness of the second support column 112 increases first and then decreases along the direction from the third guide segment 1128 to the fourth guide segment 1120.

[0133] Combination Fig.11 As shown, when processing the second support column 112 on the first housing 1, the vertex of the third guide segment 1128 faces the first support column 111, and the fourth guide segment 1120 faces the third support column 113. It can also be understood that the center line of the second support column 112 is parallel to the first direction.

[0134] Optionally, the cone angle β of the third guide segment 1128 and the cone angle γ of the fourth guide segment 1120 are both in the range of 20°-80°. Optionally, the cone angle β of the third guide segment 1128 is greater than the cone angle γ of the fourth guide segment 1120 .

[0135] When the gaseous medium flowing from the evaporation end to the second support column 112 contacts the third guide section 1128 , the contact area between the gaseous medium and the second support column 112 can be reduced compared to contacting the arc surface of the cylindrical support column.

[0136] It should be noted that, in order to reduce the resistance of the second support column 112 to the gaseous working medium, the smaller the cone angle β of the third guide segment 1128 and the cone angle γ of the fourth guide segment 1120 , the better.

[0137] pass Fig.10 and Fig.12 It can be seen that the first guide section 1125 of the shuttle support column and the third guide section 1128 of the double-conical support column have the same shape; the first connecting section 1126 of the shuttle support column and the second connecting section 1129 of the double-conical support column have the same shape; the only difference is that the second guide section 1127 and the fourth guide section 1120 have different shapes. Therefore, the shuttle support column and the double-conical support column can be summarized as conical support columns.

[0138] It is understandable that the above-mentioned wing-shaped support column, double-conical support column and shuttle-shaped support column are all improved on the basis of the elliptical support column, so the elliptical support column can also reduce the resistance to the flow of gaseous working medium compared with the cylindrical support column. Further, the rectangular support column can also reduce the resistance to the flow of gaseous working medium.

[0139] In summary, as long as the second support column 112 meets the following conditions: the length of the second support column 112 is the largest along the direction from the end close to the evaporation end to the end close to the condensation end, that is, the length of the second support column 112 along the first direction is greater than the length of the support column in any other direction, the resistance to the flow of the gaseous working medium can be reduced.

[0140] Combine the following Fig.13 The simulation results of different shapes of the second support column 112 illustrate the technical effect of the solution in this application. Fig.13 Simulation diagram of velocity vector and pressure gradient corresponding to single support pillars of different shapes.

[0141] The cross-sectional areas of the second support column 112 when they are respectively an elliptical support column, a first wing-shaped support column, a second wing-shaped support column, a shuttle-shaped support column and a cylindrical support column are the same.

[0142] Fig.13 Region A indicates that the angle between the velocity vector of the gaseous working medium and the pressure gradient of the gaseous working medium during flow is close to or equal to 90°, and region B indicates that the angle between the velocity vector of the gaseous working medium and the pressure gradient is close to or equal to 0°.

[0143] It should be noted that the darker the color in area A, the closer the angle between the velocity vector of the flow of the gaseous working fluid and the pressure gradient of the gaseous working fluid during the flow is to 90°, and the darker the color in area B, the closer the angle between the velocity vector of the gaseous working fluid and the pressure gradient is to 0°.

[0144] By comparing the size of the area of ​​area B and the area of ​​area A in the same area near the second support column 112, the angle deviation of the velocity vector and the pressure gradient in this area can be determined. The smaller the area of ​​area B, the larger the angle of the velocity vector and the pressure gradient in the corresponding area.

[0145] By comparison, it can be seen that when the second support column 112 is a cylindrical support column, the angle between the velocity vector and the pressure gradient of the gaseous working medium near the cylindrical support column is smaller. In the same area near the second support column 112, the angle between the velocity vector and the pressure gradient of the gaseous working medium near the circular support column is smaller than the angle between the velocity vector and the pressure gradient of the biconical support column, the angle between the velocity vector and the pressure gradient of the first airfoil support column, and the angle between the velocity vector and the pressure gradient of the second airfoil support column.

[0146] According to the field synergy principle and the synergy formula of velocity field and pressure field, the larger the angle between the velocity vector and the pressure gradient, the smaller the pressure drop and the corresponding flow resistance.

[0147] Among them, the coordinated formula of velocity field and pressure field is:

[0148]

[0149] Among them, N p is the pressure drop;

[0150] is the pressure gradient of the flow of the gaseous working medium;

[0151] is the velocity vector of the flow of the gaseous working medium;

[0152] u is the flow velocity of the gaseous working medium;

[0153] φ is the angle between the velocity vector of the flow of the gaseous working medium and the pressure drop gradient.

[0154] Combination Fig.13 It can be seen that in the simulation effect diagram, most of the area near the first airfoil support column and the second airfoil support column is area A, so the pressure drop of the airfoil support column is the smallest.

[0155] In order to more clearly express the pressure drop results of the second support pillars 112 with different shapes, the pressure drop results are described below in combination with specific pressure drop data obtained by simulation.

[0156] Simulation condition settings: The flow space size of the gaseous working medium is 5mm*5mm*0.1mm, which assumes the size of the accommodating cavity of the heat spreader; the entry speed of the gaseous working medium into the space is 3m / s, which assumes the initial speed of the liquid working medium in the heat spreader turning into the gaseous working medium and flowing into the accommodating cavity; the cross-sectional area of ​​a single second support column 112 of different shapes is set to 0.50265mm 2 (Radius of cylindrical support column = 0.8 mm) A simulation analysis is performed on the second support column 112 with the same cross-sectional area but different shape. The simulation analysis results are as follows:

[0157] Wherein, the pressure drop loss when the second support column 112 is a cylindrical support column is: 4Pa;

[0158] The pressure drop loss when the second support column 112 is an elliptical support column: 2Pa;

[0159] The pressure drop loss when the second support column 112 is a double-conical support column: 1.8 Pa;

[0160] The pressure drop loss when the second support column 112 is a first airfoil support column: 1.5 Pa;

[0161] The pressure drop loss when the second support column 112 is a second airfoil support column is: 1.55Pa.

[0162] In summary, under the premise of the same cross-sectional area, compared with the circular support column, the elliptical support column, the airfoil support column and the shuttle support column all have the effect of significantly reducing the flow resistance of the gaseous working fluid. Therefore, the heat spreaders corresponding to these support columns can ensure the circulation efficiency and thus ensure the heat dissipation effect.

[0163] From the above content, it can be known that the way to ensure the heat dissipation effect in the above embodiment is: reduce the resistance of a single support column, increase the flow speed of the gaseous working medium, thereby improving the efficiency of the gas-liquid circulation, and then ensure the heat dissipation effect. It can be understood that in other embodiments, the second support column 112 can be set as an airfoil support column to reduce the resistance to the flow of the gaseous working medium. The following embodiments are based on the change of the shape of the second support column 112, and further adopt other methods to ensure the heat dissipation effect.

[0164] In some embodiments, the heat exchange performance can be improved by improving the uniformity of the distribution of the gaseous working medium in the accommodating chamber, thereby ensuring the heat dissipation effect.

[0165] Below Fig.14 The above embodiment is used as an example to illustrate how to improve the uniformity of the distribution of the gaseous working medium in the accommodating chamber, thereby improving the heat exchange performance and ensuring the heat dissipation effect. Fig.14 It is a sixth structural schematic diagram of the first shell.

[0166] like Fig.14 As shown, the structure of the first shell 1 is Figure 7 The structure of the first housing 1 shown is the same, except that in the second direction, the spacing between the support columns 11 increases with the distance from the heat source 1000. Optionally, in the first direction, the spacing between the support columns 11 increases with the distance from the heat source 1000.

[0167] The heat source 1000 is close to the middle position of the evaporation end of the first shell 1. Along the first direction and the second direction, the first support column 111, the second support column 112 and the third support column 113 all meet the following conditions: the density close to the heat source 1000 is greater than the density far from the heat source 1000.

[0168] The density of the support column 11 near the heat source 1000 is relatively large, and the greater the density, the greater the resistance to the flow of the gaseous working medium; the density of the support column 11 far from the heat source 1000 is relatively small, and the smaller the density, the smaller the resistance to the flow of the gaseous working medium. Based on the principle that gas will diffuse to a position with less resistance, it can be known that the gaseous working medium will quickly diffuse from a position close to the heat source 1000 to a direction away from the heat source 1000, ensuring that the gaseous working medium can quickly fill the accommodating cavity of the heat spreader. Therefore, by adopting a distribution method with different densities of the support column 11, the diffusion of the gaseous working medium from the evaporation end to the condensation end can be more uniform, and the gaseous working medium can be evenly distributed over a wider range. The wider the distribution range of the gaseous working medium, the larger the heat exchange area, thereby ensuring the heat dissipation effect.

[0169] In the above embodiments, the heat source 1000 is located at the end of the vapor chamber. In some embodiments, the heat source 1000 may also be located in the middle of the vapor chamber. Figures 15 to 17 The arrangement of the support column 11 when the heat source 1000 is located in the middle of the heat sink is described. Fig.15 is a seventh structural schematic diagram of the first shell, Fig.16 is a schematic diagram of the eighth structure of the first shell, Fig.17 This is a ninth structural schematic diagram of the first shell.

[0170] See also Figures 15 to 17 As shown, the heat source 1000 is close to the middle position of the first shell 1. At this time, the middle position of the first shell 1 is the evaporation end, and the circumferential outer edge position of the first shell 1 is the condensation end, and the section between the evaporation end and the condensation end is the middle section.

[0171] The evaporation end is provided with a first support column 111, the middle section is provided with a second support column 112, and the condensation end is provided with a third support column 113. The first support column 111 and the third support column 113 are both cylindrical support columns, and the second support column 112 is an airfoil support column.

[0172] like Fig.15 As shown, in order to reduce the resistance of the gaseous working medium in the process of flowing from the evaporation end to the condensation end, the center line of the second support column 112 is arranged along the direction of gas flow. By reducing the resistance of the support column 11 to the flow of the gaseous working medium, the flow speed of the gaseous working medium can be increased, the efficiency of the gas-liquid cycle can be improved, and the heat dissipation effect can be ensured.

[0173] It should be noted that the direction of gas flow in this article is the connection direction between the evaporation end and the condensation end, that is, Fig.15 The first direction is the outward divergent direction with the heat source 1000 as the center.

[0174] like Fig.16As shown, the center line of the second support column 112 is arranged along the direction of gas flow, and the density of the first support column 111 and the second support column 112 both satisfy: with the heat source 1000 as the center, the density gradually decreases from the evaporation end to the condensation end. Fig.16 The first shell 1 in the illustrated embodiment improves the uniformity of distribution of the gaseous working medium in the evaporation chamber and the efficiency of gas-liquid circulation, thereby ensuring the heat dissipation effect, based on reducing the resistance of a single support column to the flow of the gaseous working medium.

[0175] It should be noted that no matter where the heat source 1000 is located relative to the heat spreader and no matter the shape of the heat spreader, the purpose of improving the efficiency of the gas-liquid circulation can be achieved by reducing the resistance of the support column 11 to the flow of the gaseous working medium and improving the uniformity of the distribution of the gaseous working medium in the evaporation chamber.

[0176] All the above embodiments ensure the heat dissipation effect by changing the shape and / or layout of the support pillars 11. In some embodiments, the heat dissipation effect can also be ensured by changing the cross-sectional area of ​​the support pillars.

[0177] See below Fig.17 The first housing shown illustrates a method of changing the cross-sectional area of ​​the support column to ensure the heat dissipation effect.

[0178] like Fig.17 As shown, the cross-sectional area of ​​the support column 11 gradually decreases from the evaporation end to the condensation end.

[0179] It should be noted that the specific dimensions of the cross-sectional areas of the first support column 111, the second support column 112 and the third support column 113 can be set according to heat dissipation requirements and processing technology. Optionally, the cross-sectional areas of the first support column 111, the second support column 112 and the third support column 113 range from 0.05 mm to 1 mm.

[0180] Those skilled in the art can understand that no matter where the heat source 1000 is located relative to the heat sink, and no matter the shape of the first shell 1, the cross-sectional area of ​​the support column 11 gradually decreases from the evaporation end to the condensation end.

[0181] By gradually reducing the cross-sectional area of ​​the support column 11 from the evaporation end to the condensation end, the resistance at the evaporation end can be increased and the resistance at the condensation end can be reduced. When the resistance at both ends of the accommodating cavity is different, the gaseous working medium at the evaporation end can quickly diffuse to the condensation end with smaller resistance, thereby improving the uniformity of the distribution of the gaseous working medium in the evaporation cavity and the gaseous working medium is evenly distributed over a wider range, so the heat exchange area is larger, thereby ensuring the heat dissipation effect.

[0182] The first housings 1 involved in the above embodiments are all rectangular pieces with regular shapes, and the shape of the first housing 1 is the shape of a heat spreader. Therefore, the above embodiments show the layout of the support columns 11 in a rectangular heat spreader with regular shapes. In some embodiments, heat spreaders of different shapes may appear, that is, first housings 1 of different shapes may appear, depending on the installation space of the electronic device.

[0183] Combine the following Figures 18 to 22 The layout of the support column 11 in the shape of the vapor chamber that may be involved is described below. The layout principle of the support column 11 in this article can be referred to for vapor chambers of other shapes. Fig.18 is a tenth structural schematic diagram of the first shell, Fig.19 is an eleventh structural schematic diagram of the first shell, Fig. 20 is a twelfth structural schematic diagram of the first shell, Fig.21 is a thirteenth structural schematic diagram of the first shell, Fig. 22 This is the fourteenth structural schematic diagram of the first shell.

[0184] like Figures 18 to 21 As shown, the heat spreader corresponding to the first shell 1 is a narrow heat spreader, which is mainly used in scenarios where the width of the heat spreader is comparable to or slightly larger than the heat source 1000. Optionally, the length-to-width ratio of the narrow heat spreader is 5:1.

[0185] The middle position of the first shell 1 is close to the heat source 1000, so the middle position of the first shell 1 is the evaporation end, the two ends of the first shell 1 are the condensation ends, and the middle section is between the condensation end and the evaporation end. Since the evaporation end is located in the middle, there are two condensation ends and two middle sections, and the gaseous working medium reaches the corresponding condensation end in two ways from the evaporation end.

[0186] The first support column 111 is a cylindrical support column and is evenly distributed at the evaporation end; the second support column 112 is an airfoil support column parallel to the first direction and is distributed in the middle section; the third support column 113 is a cylindrical support column and is staggered at the condensation end.

[0187] Combination Figures 18 to 21 as well as Figure 8 The shape of the airfoil support column shown is known. Figure 8 When the first side surface 1123 and the second side surface 1124 are both arc surfaces, Figures 18 to 21 The airfoil support strut shown, therefore, Figures 18 to 21 The airfoil support column in also satisfies: the relationship between the chord length H and the maximum thickness D of the second support column 112 is D / H=0.05-0.95.

[0188] In order to ensure the heat dissipation requirements of the narrow heat spreader, the layout of the support column 11 or the shape of the support column 11 mentioned in all the above embodiments can be changed, which will not be repeated here. In this embodiment, the support column 11 is further used to guide the flow of the gaseous working medium, so that the gaseous working medium is distributed more evenly to ensure the heat dissipation requirements.

[0189] like Fig.18 As shown, the evaporation end of the first shell 1 is located in the middle position, and the structure of the first shell 1 is described by taking one side of the first shell 1 as an example, and the other side can refer to the description below.

[0190] The second support columns 112 are arranged in only one row along the second direction and are symmetrically arranged about the first direction. The lengths of the second support columns 112 are different, and the lengths of the second support columns 112 gradually increase from the middle of the first housing 1 to both sides in the second direction. The second support columns 112 are flush at one end close to the evaporation end, and have different lengths at the other end close to the condensation end.

[0191] That is, along the second direction, the length of the steam channel 12 in the middle section close to the middle position of the first shell 1 is smaller than the length of the steam channel 12 at both ends of the first shell 1 in the middle section.

[0192] Since the third support columns 113 are arranged in a staggered manner, the resistance of the steam channel 12 between the third support columns 113 is greater than the resistance of the steam channel 12 between the second support columns 112 under the effect of turbulence. By shortening the length of the steam channel 12 near the middle position in the middle section, the gaseous working medium passing through the steam channel 12 located in the middle position in the middle section can reach the condensation end first, and after the gaseous working medium reaches the bottom of the condensation section, the resistance of the steam channel 12 located in the middle position of the condensation end will increase; thus, part of the gaseous working medium will enter the condensation end area from the steam channels 12 at both ends of the middle section, making the gaseous working medium in the entire accommodating cavity more evenly distributed, effectively improving the heat exchange efficiency.

[0193] It can be seen from the above-mentioned guiding effect on the second support column 112 that the above-mentioned arrangement can avoid the problem of local concentration of gaseous working medium in the heat spreader and the occurrence of local hot spots.

[0194] like Fig.19 As shown, the evaporation end of the first shell 1 is located in the middle position, and the structure of the first shell 1 is described by taking one side of the first shell 1 as an example, and the other side can refer to the description below.

[0195] The second support columns 112 are arranged in only one row along the second direction and are symmetrically arranged with respect to the first direction. The lengths of the second support columns 112 are different, and the lengths of the second support columns 112 gradually increase from the middle of the first housing 1 to both sides in the second direction. Among them, the end of the second support column 112 close to the evaporation end and the end close to the condensation end are not flush, and the connecting line of the end of the second support column 112 close to the first support column 111 and the connecting line of the end close to the third support column 113 are both V-shaped, and the second support columns 112 are arranged symmetrically with respect to the second direction.

[0196] It should be noted that the second support column 112 near the evaporation end is at the same distance from the adjacent first support column 111. Therefore, along the second direction, the number of first support columns 111 near the middle position of the evaporation end is greater than the number of first support columns 111 at both ends of the evaporation end.

[0197] That is, along the second direction, the length of the steam channel 12 near the middle position in the middle section will be smaller than the length of the steam channel 12 at both ends of the middle section, and the length of the steam channel 12 near the middle position in the evaporation end will be larger than the length of the steam channel 12 at both ends of the evaporation end.

[0198] By increasing the length of the steam channel 12 near the middle position of the evaporation end, compared with the middle section, the gaseous working fluid in the middle position of the evaporation end can be diffused to the two sides of the evaporation end with smaller resistance, which is beneficial to the diffusion of the gaseous working fluid, thereby avoiding the problem of local concentration of gaseous working fluid in the heat spreader and the occurrence of local hot spots.

[0199] for Fig.19 The arrangement and effect of the second support column 112 near the condensation end are shown in FIG. Fig.18 The content of the second support column 112 is sufficient and will not be repeated here.

[0200] Combining the distribution of the first support columns 111 and the distribution and guiding function of the second support columns 112 , it can be seen that the problem of local concentration of gaseous working fluid in the heat spreader and the occurrence of local hot spots can be further avoided.

[0201] In the above embodiments, the first support column 111 and the third support column 113 are both cylindrical support columns. In some embodiments, the cross-sectional shapes of the first support column 111 and the third support column 113 can also be changed to reduce the resistance of the first support column 111 and the third support column 113 to the gaseous working medium.

[0202] by Fig. 20 and Fig.21 The narrow heat spreader corresponding to the first housing 1 is used as an example for explanation:

[0203] like Fig. 20 and Fig.21As shown, the first shell 1 is processed with support columns 11, and the support columns 11 include a first support column 111, a second support column 112 and a third support column 113. The middle position of the first shell 1 is close to the heat source 1000, and the position close to the heat source 1000 is the evaporation end, the position away from the heat source 1000 is the condensation end, and the middle section is between the condensation end and the evaporation end.

[0204] The first support column 111 is located at the evaporation end, the second support column 112 is located at the middle section, and the third support column 113 is located at the condensation end. The cross-sectional shape and arrangement of the second support column 112 can be referred to Fig.19 The above is not repeated here.

[0205] Fig. 20 The first support column 111 is a rectangular support column extending along the length direction of the first shell 1. Since the rectangular support column can further reduce resistance compared with the circular support column, setting the first support column 111 to a rectangle can improve the efficiency of gas-liquid circulation and ensure the heat dissipation effect.

[0206] The cross-sectional shape of the first support column 111 includes, but is not limited to, a rectangle, and may also be an ellipse or an airfoil, etc., so as to reduce the resistance of the first support column 111 .

[0207] Based on the above embodiments, Fig.21 The cross-sectional shape of the third support column 113 includes but is not limited to a rectangular, elliptical or wing-shaped shape. Taking the third support column 113 as a rectangular support column as an example, since the rectangular support column can further reduce the resistance compared with the circular support column, therefore, setting the third support column 113 as a rectangle can improve the efficiency of gas-liquid circulation and ensure the heat dissipation effect.

[0208] It should be noted that the cross-sectional shapes of the first support column 111 and the third support column 113 mentioned herein may adopt all the shapes mentioned in the second support column 112 of this embodiment.

[0209] The following combination Fig. 22 The support column 11 provided on the irregular-shaped first housing 1 will be described.

[0210] like Fig. 22 As shown, the first shell 1 is in the shape of an L-shaped member, one end of the L-shaped member is close to the heat source 1000, and this end is the evaporation end, and the other end is the condensation end. The evaporation end is provided with a first support column 111, and the first support column 111 is a cylindrical support column; the middle section is provided with a second support column 112, and the second support column 112 is an airfoil support column; the condensation end is provided with a third support column 113, and the third support column 113 is a staggered cylindrical support column.

[0211] The center line of the second support column 112 is smoothly arranged along the L-shaped part, so that the gaseous working medium flows along the trend of the second support column 112 during the flow from the evaporation end to the condensation end, which can reduce the resistance of the second support column 112 to the gaseous working medium.

[0212] The shape of the second support column 112 can be adaptively adjusted according to the flow of the gaseous working medium from the evaporation end to the condensation end.

[0213] It should be noted that the first shell 1 of different shapes and the heat source 1000 located at different positions of the first shell 1 can adopt all the shapes of the support columns involved in this article, such as the wing-shaped support columns, and all the arrangement methods involved. For example, the density of the support columns close to the heat source 1000 is greater than the density of the support columns far away from the heat source 1000 and / or the size of the support columns close to the heat source 1000 is greater than the size of the support columns far away from the heat source 1000, etc., to ensure the heat dissipation effect.

[0214] The shapes of the first support column 111 , the second support column 112 , and the third support column 113 herein may be arbitrarily combined.

[0215] The present application also discloses an electronic device, including a heat spreader, and the heat spreader is the heat spreader disclosed in the above embodiment. Therefore, the electronic device with the heat spreader also has all the above technical effects, which will not be described one by one here.

Claims

1. A heat sink, characterized in that: include: A first shell, a second shell and a support column; the position of the first shell close to the heat source is the evaporation end, the position away from the heat source is the condensation end, and the middle section is between the evaporation end and the condensation end; The support column is fixed between the first shell and the second shell, and the support column includes a first support column, a second support column and a third support column, the first support column is located at the evaporation end of the first shell, the second support column is located at the middle section of the first shell, and the third support column is located at the condensation end of the first shell; the first shell is sealed and connected to the second shell and a containing cavity is formed between the two; The first support columns are cylindrical support columns, and the first support columns are evenly distributed in a rectangular array at the evaporation end of the first shell; The length of the cross-section of the second support column and the cross-section of the third support column along the first direction is greater than the length along the second direction, and along the first direction, the width of the second support column and the width of the third support column first increase and then decrease, wherein the first direction is from the evaporation end to the condensation end, and the second direction is perpendicular to the first direction; the second support columns are evenly distributed in a rectangular array in the middle section of the first shell, and the third support columns are evenly distributed in a rectangular array at the condensation end, and the second support columns and the third support columns are arranged opposite each other along the first direction.

2. The heat spreader according to claim 1, wherein: It includes multiple columns of the second support columns arranged along the first direction and multiple columns of the third support columns arranged along the first direction; the multiple columns of the second support columns and the multiple columns of the third support columns correspond one to one, and the one-to-one corresponding single column of the second support columns and the single column of the third support columns are arranged in the same straight line along the first direction.

3. The heat spreader according to claim 1, wherein: The second support column and the third support column are both wing-shaped support columns, and the cross-section of the wing-shaped support column includes: a leading edge and a trailing edge, wherein the leading edge has an angle greater than that of the trailing edge, and the leading edge faces the heat source; A first side edge and a second side edge, wherein the first side edge and the second side edge are respectively located at both sides of the leading edge and the trailing edge and connect the leading edge and the trailing edge.

4. The heat spreader according to claim 3, wherein: The first side or the second side is a straight line.

5. The heat spreader according to claim 3, wherein: The first side edge and the second side edge are arc-shaped and symmetrical about a line connecting the leading edge and the trailing edge.

6. The heat sink as claimed in claim 3, characterized in that: The front edge is elliptical or arc-shaped.

7. The vapor chamber according to claim 3, characterized in that: The chord length H of the cross section of the airfoil support column and the maximum thickness D of the airfoil support column satisfy: D / H=0.05-0.

95.

8. The vapor chamber according to claim 1, wherein: The second support column and the third support column are both shuttle-shaped support columns, and the cross-section of the shuttle-shaped support column includes: a first guide segment, a first connecting segment and a second guide segment connected in sequence, the top angle of the first guide segment faces the first support column, and along the direction from the first guide segment to the second guide segment, the width of the first guide segment gradually increases, and the width of the second guide segment gradually decreases.

9. The vapor chamber according to claim 8, wherein: The first guide section is triangular, and the second guide section is semi-elliptical.

10. The vapor chamber according to claim 8, characterized in that: The cone angle of the first guide section ranges from 20° to 80°.

11. The vapor chamber according to any one of claims 1 to 10, characterized in that: It also includes a capillary structure, which is located in the accommodating cavity. 12 . An electronic device comprising a vapor chamber, wherein the vapor chamber is the vapor chamber according to claim 1 .

13. The electronic device according to claim 12, characterized in that: It also includes a display screen, a rear shell and a middle frame. The display screen and the rear shell are respectively fixed to two sides of the middle frame, and the heat spreader is installed on a side of the middle frame close to the display screen.

14. The electronic device according to claim 13, characterized in that: It also includes a circuit board, which is installed between the middle frame and the rear shell, and the heat sink is used to dissipate heat from the heat source on the circuit board.

15. The electronic device according to claim 13 or 14, characterized in that: A battery is also included, and the battery is installed between the middle frame and the rear shell.

16. The electronic device according to claim 14, characterized in that: The heat source includes at least one of a system-on-chip, a central processing unit, or an image processor.

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