Vapor chamber and electronic equipment

Abstract

The invention provides a vapor chamber and electronic equipment, and the vapor chamber comprises a first housing and a second housing, the first housing and the second housing are in sealed connection, and an accommodation cavity is formed between the first housing and the second housing; the supporting column is fixed between the first shell and the second shell, the position, close to a heat source, of the first shell is an evaporation end, and the position, away from the heat source, of the first shell is a condensation end; the length of the cross section of at least part of the supporting columns in the first direction is larger than the length of the cross section of at least part of the supporting columns in the second direction, the first direction is the direction from the evaporation end to the condensation end, and the second direction is perpendicular to the first direction. The cross sections of at least part of the supporting columns are arranged to be long 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, the flowing resistance of the supporting columns to the flowing gaseous working medium can be reduced, the gas-liquid circulation efficiency is guaranteed, and then the heat dissipation effect is guaranteed.

Description

Vapor chambers and electronic devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on April 27, 2023, with application number 202310478530.6 and invention name “Heat spreader and electronic device”, the entire contents of which are incorporated by reference into this application. 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 chambers (VCs), also commonly called temperature vapor chambers, superheat conducting plates, or thermally conductive plates, are widely used in integrated devices as efficient heat dissipation components.

[0004] The vapor chamber includes a first shell, a second shell, and a capillary structure. The first shell is sealed to the second shell, and the capillary structure is located on the second shell. The first shell has support columns on the side closest to the second shell for supporting the first shell and the capillary structure. Adjacent support columns form steam channels for the flow of gaseous working fluid.

[0005] When the distance between the first and second shells is determined, the height of the support columns is also determined. To improve the strength of the vapor chamber, the cross-sectional area of ​​the support columns can be increased. However, increasing the cross-sectional area of ​​the support columns increases the resistance to the flow of the gaseous working medium, affecting the efficiency of the gas-liquid circulation and, in turn, 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 those skilled in the art.

[0007] Summary of the Invention

[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 above-mentioned vapor chamber.

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

[0010] In the first aspect, the present application provides a heat spreader, comprising a first shell and a second shell, the first shell and the second shell being sealed and connected 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 away from the heat source being 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 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 a shape that is longer 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 reducing the flow resistance of the support column to the flowing gaseous working medium, ensuring the efficiency of the gas-liquid circulation, and thus ensuring the heat dissipation effect.

[0012] In a possible implementation, a support column having a cross-section with 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] From the above content, it can be seen 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 the gas-liquid circulation, and thus 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 is longer in the first direction than in the second direction; and a third support column, the third support column is located at the condensation end of the first shell.

[0015] In a possible embodiment, 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] From the above content, it can be seen that the side-by-side arrangement of the first and second support columns is beneficial to reducing the resistance to the gaseous working medium; the staggered arrangement of the third support columns can improve the heat exchange efficiency of the condensation end, thereby ensuring the heat dissipation effect.

[0017] In one 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 diversion 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 the following condition: 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-shaped support column, and the cross-section of the airfoil-shaped 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] From the above content, it can be seen that the use of wing-shaped support columns is beneficial to reducing the resistance of the support columns to the gaseous working medium, ensuring the efficiency of gas-liquid circulation, and thus ensuring the heat dissipation effect.

[0022] In one possible embodiment, the chord length H of the cross section of the airfoil-shaped support column and the maximum thickness D of the airfoil-shaped 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] From the above, it can be seen that the use of tapered support columns is beneficial 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 embodiment, the lengths of the steam channels formed by adjacent second support columns in the first direction gradually increase from the middle to both sides of the first shell in the second direction.

[0028] From the above content, it can be seen 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 embodiment, the lengths of the second support columns gradually increase 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 embodiment, ends of the plurality of second support pillars close to the first support pillar are flush with each other, or a line connecting ends of the plurality of second support pillars close to the first support pillar 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, the gaseous working medium is facilitated 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 embodiment, the first support columns are evenly distributed along the first direction, and the third support columns are staggered at the condensation end.

[0034] In one possible embodiment, 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 sealing 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 one possible embodiment, the size of the support pillars 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 sealing 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, 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 vapor chamber, wherein the vapor chamber is the vapor chamber described above.

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

[0041] FIG1 is a disassembled side view of a mobile phone provided by the prior art;

[0042] FIG2 is a disassembled front view of the middle frame and the heat spreader of a mobile phone provided by the prior art;

[0043] FIG3 is a front cross-sectional view of a vapor chamber provided by the prior art;

[0044] FIG4 is a schematic structural diagram of a first shell provided by the prior art.

[0045] FIG5 is a front view of a first structure of a first housing provided in an embodiment of the present application;

[0046] FIG6 is a front view of a second structure of the first housing provided in an embodiment of the present application;

[0047] FIG7 is a front view of a third structure of the first housing provided in an embodiment of the present application;

[0048] FIG8 is a schematic structural diagram of an airfoil support column provided in an embodiment of the present application;

[0049] FIG9 is a schematic diagram of a fourth structure of the first housing provided in an embodiment of the present application;

[0050] FIG10 is a schematic structural diagram of a spindle-shaped support column provided in an embodiment of the present application;

[0051] FIG11 is a schematic diagram of a fifth structure of the first housing provided in an embodiment of the present application;

[0052] FIG12 is a schematic structural diagram of a double-conical support column provided in an embodiment of the present application;

[0053] FIG13 is 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] FIG14 is a sixth structural schematic diagram of the first housing provided in an embodiment of the present application;

[0055] FIG15 is a seventh structural schematic diagram of the first housing provided in an embodiment of the present application;

[0056] FIG16 is a schematic diagram of an eighth structure of the first housing provided in an embodiment of the present application;

[0057] FIG17 is a ninth structural schematic diagram of the first housing provided in an embodiment of the present application;

[0058] FIG18 is a schematic diagram of a tenth structure of the first housing provided in an embodiment of the present application;

[0059] FIG19 is a schematic diagram of an eleventh structure of the first housing provided in an embodiment of the present application;

[0060] FIG20 is a schematic diagram of a twelfth structure of the first housing provided in an embodiment of the present application;

[0061] FIG21 is a schematic diagram of the thirteenth structure of the first housing provided in an embodiment of the present application;

[0062] FIG22 is a schematic diagram of the fourteenth structure 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 of the present application and the appended claims, the singular expressions "a", "an", "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 related objects before and after are in an "or" relationship.

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

[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" and "second" are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance or order.

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

[0067] A vapor chamber (VC), also commonly called a temperature vapor chamber, superconducting plate, or thermally conductive plate, is a highly efficient heat dissipation component widely used in integrated devices. In the following text, integrated devices are referred to as electronic devices. These devices include mobile phones, tablets, and laptops.

[0068] The following describes the application of vapor chambers in electronic devices using a mobile phone as an example, with reference to Figures 1 and 2. Figure 1 is a disassembled side view of the mobile phone, and Figure 2 is a disassembled front view of the mobile phone's middle frame and vapor chamber.

[0069] As shown in FIG1 , 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 case 400 are respectively fixed to the two sides of the middle frame 200, the heat spreader 100 is fixed to the middle frame 200, and the circuit board 500 and the battery 600 are installed between the middle frame 200 and the rear case 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 case 400.

[0071] As shown in Figure 2, the middle frame 200 has a mounting hole 201. The heat spreader 100 is installed in the mounting hole 201 by means of snapping, bonding or welding, and is attached to the circuit board 500 in Figure 1. The heat spreader 100 dissipates heat from the heat source devices 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), inductor and fast charging device.

[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 heat dissipation principle of the vapor chamber 100 is described below with reference to the specific structure of the vapor chamber 100 shown in Figures 3 and 4. Figure 3 is a front cross-sectional view of a vapor chamber in the prior art, and Figure 4 is a schematic structural diagram of the first housing 01 in the prior art embodiment.

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

[0076] The first shell 01 and the second shell 02 are sealed together, for example, by welding. A vacuum chamber is formed between the first shell 01 and the second shell 02. The capillary structure 03 is located within the chamber. Optionally, the capillary structure 03 is formed by etching or screen spot welding on the second shell 02. The chamber is a flow space for the gaseous working medium, while the capillary structure 03 is a flow space for the liquid working medium.

[0077] Support columns 011 are located within the accommodating cavity and abut against capillary structures 03. Steam channels 012 are formed between adjacent support columns 011. Steam channels 012 communicate with capillary structures 03 to form a circulation channel for the phase-change medium. Support columns 011 can be formed by etching or stamping the inner side of the first housing 01.

[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 vapor chamber 100 is operating, the phase-change working fluid at the evaporation end of vapor chamber 100 absorbs heat generated by heat source 1000 and changes phase to a gaseous working fluid. The gaseous working fluid flows along steam channel 012 to the condensation end, where it dissipates heat through external forced convection or due to the pressure difference between the evaporation and condensation ends. After condensation, the phase-change working fluid changes to a liquid working fluid, which then flows back to capillary structure 03. Under the action of capillary pressure, the liquid working fluid within capillary structure 03 flows toward the evaporation end for the next phase change, achieving cyclic cooling. The cyclic cooling process of vapor chamber 100 achieves continuous and rapid heat dissipation of 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 collapsing 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. To improve the strength of the heat sink 100, the cross-sectional area of ​​the support column 011 can be increased. However, increasing the cross-sectional area of ​​the support column 011 will increase the resistance to the flow of the gaseous working medium.

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

[0084] In the following, the resistance of the support column 011 is described by simplifying the first shell 01 into a rectangular member with reference to the structure of the first shell 01 shown in FIG4 , taking the 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] In FIG4 , the support columns 011 on the first shell 01 are cylindrical and are evenly distributed on the first shell 01 . Therefore, the support columns 011 at various locations on the first shell 01 have the same resistance to the gaseous working medium, and steam channels 012 are located between adjacent support columns 011 .

[0086] It should be noted that the cross-section of the support column 011 can also be square. When the cross-section of the support column referred to herein is a rectangular, square, or triangular shape with sharp corners, it is preferred that the corners be rounded during processing. In some embodiments, the size of the support column 011 can be variable along the height direction of the support column 011, but the cross-sectional shape of the support column 011 remains unchanged.

[0087] As the gaseous working medium flows through steam channel 012, it constantly collides with support columns 011, causing support columns 011 to create resistance to the flow of the gaseous working medium. This resistance from support columns 011 gradually reduces the flow rate of the gaseous working medium, increasing the time it takes to travel from the evaporation end to the condensation end. This, in turn, affects the efficiency of the gas-liquid circulation and, consequently, 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 cavity is improved, thereby improving the efficiency of the gas-liquid circulation and ensuring the heat dissipation effect.

[0089] In order to enable those skilled in the art to clearly understand the solution of the present application, the technical solution in the embodiment of the present application will be clearly and completely described below in conjunction with Figures 5 to 7 in the embodiment of the present application.

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

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

[0092] The support columns 11 include 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] As shown in Figure 5, first support columns 111 are cylindrical support columns and are evenly distributed in a rectangular array at the evaporation end of first housing 1. Second support columns 112 are wing-shaped support columns and are evenly distributed in a rectangular array in the middle section of first housing 1. Third support columns 113 are cylindrical support columns and are evenly distributed in a rectangular array at the condensation end of first housing 1. First support columns 111, second support columns 112, and third support columns 113 are arranged in a first direction facing each other.

[0094] The first direction herein is the direction of the line connecting 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 vapor chamber. All embodiments herein 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] As shown in Figure 6, first support columns 111 are cylindrical support columns and are evenly distributed in a rectangular array at the evaporation end of first housing 1. Second support columns 112 are wing-shaped support columns and are evenly distributed in a rectangular array in the middle section of first housing 1. Third support columns 113 are wing-shaped support columns and are evenly distributed in a rectangular array at the condensation end of first housing 1. First support columns 111, second support columns 112, and third support columns 113 are arranged opposite each other along a 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, the embodiments shown in Figures 5 and 6 both reduce the resistance of the support columns 11 to the gaseous working medium by changing the shape of the support columns 11. In some embodiments, the arrangement of the support columns 11 can be further changed to achieve the purpose of reducing the resistance of the support columns 11 to the gaseous working medium.

[0099] As shown in Figure 7, first support columns 111 are cylindrical support columns and are evenly distributed in a rectangular array at the evaporation end of first housing 1. Second support columns 112 are airfoil-shaped support columns and are evenly distributed in a rectangular array in the middle section of first housing 1. Third support columns 113 are cylindrical support columns and are staggered at the condensation end of first housing 1. First support columns 111 and second support columns 112 are arranged side by side along a first direction.

[0100] It should be noted that the staggered arrangement means 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 mean 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 third support columns 113 causes the gaseous working medium to generate disturbed flow at the condensing end, also known as turbulent flow. This is based on the principle that turbulent flow, due to the irregular motion of fluid particles, causes various quantities in the flow field to undergo chaotic changes over time and space, resulting in a smaller temperature difference between the center of the tube and the tube wall, leading to higher heat exchange efficiency. Therefore, the staggered arrangement of third support columns 113 improves heat exchange efficiency at the condensing end, thereby ensuring effective heat dissipation.

[0103] The second support column 112 is an airfoil support column, which can utilize the flow-guiding effect of the airfoil support column to reduce the flow resistance of the second support column 112 to the gaseous working medium, improve the efficiency of the 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 accommodating 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 accommodating chamber.

[0105] The following will illustrate the technical effects of the solutions corresponding to the embodiments shown in Figures 4 to 6 in combination with simulation analysis data results.

[0106] Simulation conditions are set as follows: the size of the vapor chamber 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 vapor chamber; the entry velocity of the gaseous working medium into the chamber is 5m / s, which assumes the initial velocity of the liquid working medium in the vapor chamber turning into the gaseous working medium and flowing into the chamber; the cross-sectional area of ​​the support columns with different cross-sectional shapes is 0.50265mm 2 (The diameter of the cylindrical support column is 0.8 mm); the pressure drop results obtained from the simulation are as follows:

[0107] The support columns 01 in the embodiment shown in FIG4 are all cylindrical support columns. Through simulation analysis, it is found that the average pressure drop inside the heat sink corresponding to the support columns 01 in FIG4 is 1183 Pa.

[0108] In the embodiment shown in Figure 5, the first support column 111 and the third support column 112 are both cylindrical support columns, and the second support column 112 is an airfoil-shaped support column. After simulation analysis, it is found that the average pressure drop inside the heat spreader corresponding to the support column 11 in Figure 5 is 1174 Pa. Compared with the heat spreader corresponding to Figure 4, the pressure drop gain is (1174 Pa-1183 Pa) / 1183 Pa*100%=7.6%.

[0109] In the embodiment shown in Figure 6, 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. After simulation analysis, it is found that the average pressure drop inside the heat sink corresponding to the support column 11 in Figure 6 is 1168 Pa. Compared with the heat sink corresponding to Figure 4, the pressure drop gain is (1183 Pa-1168 Pa) / 1183 Pa*100%=12.67%.

[0110] Because the support columns 11 in the embodiment shown in FIG7 are based on the support columns 11 in the embodiment shown in FIG5 , with the addition of third support columns 113 arranged in a staggered manner, the pressure drop gain of the vapor chamber corresponding to the support columns 11 in the embodiment shown in FIG5 does not change much compared to the arrangement of support columns 11 in the embodiment shown in FIG5 . However, the staggered arrangement of third support columns 113 can enhance the turbulence of the gaseous working medium in the condensing section, thereby improving the heat exchange efficiency of the condensing 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 medium, thereby ensuring the heat dissipation effect.

[0112] The above description explains the effect of using the wing-shaped support column. The following description uses the second support column 112 shown in FIG8 as an example to explain the shape and size of the wing-shaped support column involved in the embodiment of the present application.

[0113] As shown in FIG8 , when the second support column 112 is an airfoil-shaped support column, the cross section of the airfoil-shaped support column includes a leading edge 1121 , a trailing edge 1122 , a first side 1123 and a second side 1124 .

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

[0115] It should be noted that when the first side 1123 and the second side 1124 are symmetrically curved about the line connecting the leading edge 1121 and the trailing edge 1122, the second support column 112 is a first airfoil-shaped support column. When the first side 1123 and the second side 1124 are not symmetrically curved about the line connecting the leading edge 1121 and the trailing edge 1122, the second support column 112 is a second airfoil-shaped support column. The user can select the shape of the second support column 112 based on the flow direction of the gaseous working medium. 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 lower the resistance of the second support column 112.

[0116] As shown in Figure 7 , when the second support column 112 is fabricated 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. This can also be understood as: the centerline of the second support column 112 is parallel to the first direction. When the gaseous working medium flows toward the second support column 112, the leading edge 1121 guides the gaseous working medium to both sides of the second support column 112, and flows along the first side edge 1123 and the second side edge 1124 to the trailing edge 1122.

[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 circular 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 medium. 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. 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] Herein, the relationship between the chord length H and the maximum thickness D of the cross section of the second support column 112 is: D / H=0.05-0.95.

[0121] In some embodiments, the second support column 112 mentioned above can also have other shapes, for example, the second support column 112 can also be a spindle-shaped support column, a biconical support column, or an elliptical support column, etc. The following describes the guiding effects of the second support column 112 being a spindle-shaped support column and the second support column 112 being a biconical support column, respectively, with reference to Figures 9 to 12.

[0122] 9 is a schematic diagram of the fourth structure of the first shell, and FIG. 10 is a schematic diagram of the structure in which the second support column 112 is a shuttle-shaped support column.

[0123] The structure of the first shell 1 shown in Figure 9 is the same as the structure of the first shell 1 shown in Figure 7, and the only difference is the shape of the second support column 112. Therefore, the structure of the first shell 1 shown in Figure 9 can refer to the structure of the first shell 1 shown in Figure 7, and will not be repeated here.

[0124] As shown in FIG. 10 , 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 section 1125 , a first connecting section 1126 and a second guide section 1127 .

[0125] The first guide section 1125, the first connecting section 1126, and the second guide section 1127 are sequentially connected to form a whole. 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 may also be a trapezoid. The first connecting section 1126 is a rectangle. The second guide section 1127 is a semi-ellipse. The width of the cross section of the second support column 112 increases first and then decreases along the direction from the first guide section 1125 to the second guide section 1127.

[0126] 9 , when the second support column 112 is machined on the first housing 1, the top angle of the first guide section 1125 faces the first support column 111, and the second guide section 1127 faces the third support column 113. This can also be understood as follows: 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 working medium flowing from the evaporation end toward the second support column 112 contacts the first guide section 1125, the contact area between the gaseous working medium and the second support column 112 is reduced compared to contact with 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] FIG11 is a schematic diagram of a fifth structure of the first shell 1 , and FIG12 is a front view when the second support column 112 is a double-cone support column.

[0130] The structure of the first shell 1 shown in Figure 11 is the same as the structure of the first shell 1 shown in Figure 7, and the only difference is the shape of the second support column 112. Therefore, the structure of the heat spreader shown in Figure 11 can refer to the structure of the heat spreader shown in Figure 7, and will not be repeated here.

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

[0132] The third guide segment 1128, the second connecting segment 1129, and the fourth guide segment 1120 are sequentially connected to form a whole. 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. The thickness of the second support column 112 increases first and then decreases from the third guide segment 1128 to the fourth guide segment 1120.

[0133] 11 , when machining the second support column 112 on the first housing 1, the top angle of the third guide section 1128 faces the first support column 111, and the fourth guide section 1120 faces the third support column 113. This can also be understood as follows: the centerline 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] It can be seen from Figures 10 and 12 that the first guide section 1125 of the shuttle-shaped 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-shaped 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-shaped support column and the double-conical support column can be summarized as conical support columns.

[0138] It is understood that the aforementioned wing-shaped support columns, bi-conical support columns, and shuttle-shaped support columns are all improvements based on elliptical support columns. Therefore, elliptical support columns can also reduce the resistance to the flow of gaseous working fluids compared to cylindrical support columns. Furthermore, rectangular support columns can also reduce the resistance to the flow of gaseous working fluids.

[0139] In summary, as long as the second support column 112 meets the following requirements: 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] The following describes the technical effect of the solution of the present application with reference to FIG13 for simulation results of different shapes of the second support column 112. FIG13 is a simulation diagram of velocity vectors and pressure gradients corresponding to single support columns 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] In FIG13 , area 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 area 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 region 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 region 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 area of ​​Region B and Region A within the same area near the second support column 112, the angle between the velocity vector and the pressure gradient within that area can be determined. The smaller the area of ​​Region B, the larger the angle between the velocity vector and the pressure gradient within that area.

[0145] A comparison shows 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 relatively small. Within 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 angles between the velocity vector and the pressure gradient of the bi-conical support column, the first airfoil support column, and 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 synergistic formula of velocity field and pressure field is:

[0148] Where Np is the pressure drop;

[0149] is the pressure gradient of the flow of gaseous working medium;

[0150] is the velocity vector of the flow of gaseous working medium;

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

[0152] φ is the angle between the velocity vector of the flow of the gaseous working medium and the pressure drop gradient.

[0153] As can be seen from FIG13 , in the simulation effect diagram, most of the area near the first wing-shaped support column and the second wing-shaped support column is area A, so the pressure drop of the wing-shaped support column is the smallest.

[0154] 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.

[0155] Simulation conditions are set as follows: the flow space size of the gaseous working medium is 5mm*5mm*0.1mm, which assumes the size of the heat sink cavity; the entry velocity of the gaseous working medium into the space is 3m / s, which assumes the initial velocity of the liquid working medium in the heat sink to transform into the gaseous working medium and flow into the cavity; the cross-sectional area of ​​each second support column 112 of different shapes is set to 0.50265mm 2 (Radius of cylindrical support column = 0.8 mm) A simulation analysis was conducted on the second support column 112 with the same cross-sectional area but different shape. The simulation analysis results are as follows:

[0156] Wherein, the pressure drop loss when the second support column 112 is a cylindrical support column is: 4Pa;

[0157] The pressure drop loss when the second support column 112 is an elliptical support column is 2 Pa;

[0158] The pressure drop loss when the second support column 112 is a double-conical support column is 1.8 Pa;

[0159] The pressure drop loss when the second support column 112 is a first airfoil support column is 1.5 Pa;

[0160] The pressure drop loss when the second support column 112 is a second airfoil-shaped support column is 1.55 Pa.

[0161] 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-shaped support column all have the effect of significantly reducing the flow resistance of the gaseous working medium. Therefore, the heat spreaders corresponding to these support columns can ensure the circulation efficiency and thus ensure the heat dissipation effect.

[0162] As can be seen from the above description, the method for ensuring heat dissipation in the above embodiment is to reduce the resistance of a single support column, increase the flow velocity of the gaseous working medium, thereby improving the efficiency of the gas-liquid circulation and ensuring heat dissipation. It is understood that in other embodiments, the second support column 112 can be configured as an airfoil-shaped support column to reduce the resistance to the flow of the gaseous working medium. The following embodiments all further utilize other methods to ensure heat dissipation based on the changes in the shape of the second support column 112.

[0163] 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 cavity, thereby ensuring the heat dissipation effect.

[0164] The following describes how to improve the uniformity of the distribution of the gaseous working medium in the accommodating cavity, thereby improving the heat exchange performance and ensuring the heat dissipation effect, using the embodiment shown in FIG14 as an example.

[0165] As shown in FIG14 , the structure of the first housing 1 is the same as that of the first housing 1 shown in FIG7 , except that, in the second direction, the spacing between the support columns 11 increases as the distance from the heat source 1000 increases. Alternatively, in the first direction, the spacing between the support columns 11 increases as the distance from the heat source 1000 increases.

[0166] 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.

[0167] The density of the support column 11 near the heat source 1000 is relatively high, 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 low, 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 seen 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 columns 11, the diffusion of the gaseous working medium from the evaporation end to the condensation end can be made more uniform, and the gaseous working medium can be 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.

[0168] 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. The following describes the arrangement of the support columns 11 when the heat source 1000 is located in the middle of the vapor chamber, in conjunction with Figures 15 to 17 . Figure 15 is a schematic diagram of the seventh configuration of the first housing, Figure 16 is a schematic diagram of the eighth configuration of the first housing, and Figure 17 is a schematic diagram of the ninth configuration of the first housing.

[0169] 15 to 17 , 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.

[0170] 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.

[0171] As shown in Figure 15, to reduce resistance to the flow of the gaseous working medium from the evaporation end to the condensation end, the centerline 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 velocity 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 guaranteed.

[0172] 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, the first direction in Figure 15 is the outward divergent direction with the heat source 1000 as the center.

[0173] As shown in FIG16 , the centerline of the second support column 112 is arranged along the direction of gas flow, and the density of both the first support column 111 and the second support column 112 satisfies the requirement of gradually decreasing from the evaporation end toward the condensation end, centered on the heat source 1000. Specifically, the first housing 1 in the embodiment shown in FIG16 improves the uniformity of the distribution of the gaseous working medium within the evaporation chamber, thereby increasing the efficiency of the gas-liquid circulation and ensuring effective heat dissipation, while reducing the resistance of a single support column to the flow of the gaseous working medium.

[0174] 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.

[0175] 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.

[0176] The following describes a method of changing the cross-sectional area of ​​the support column to ensure the heat dissipation effect with reference to the first housing shown in FIG. 17 .

[0177] As shown in FIG17 , the cross-sectional area of ​​the support column 11 gradually decreases from the evaporation end to the condensation end.

[0178] 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.

[0179] Those skilled in the art will understand that no matter where the heat source 1000 is located relative to the heat spreader, 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.

[0180] By gradually reducing the cross-sectional area of ​​the support column 11 from the evaporation end toward the condensation end, the resistance at the evaporation end can be increased while the resistance at the condensation end can be reduced. When the resistance at both ends of the accommodating chamber is different, the gaseous working medium at the evaporation end can quickly diffuse toward the condensation end, where the resistance is lower. This improves the uniformity of the gaseous working medium distribution within the evaporation chamber and allows for a wider distribution range. Consequently, the heat exchange area is increased, thereby ensuring effective heat dissipation.

[0181] The first housing 1 mentioned in the above embodiments is a regularly shaped rectangular member, simulating the shape of a vapor chamber. Therefore, the above embodiments illustrate the layout of support columns 11 within a regularly shaped rectangular vapor chamber. In some embodiments, vapor chambers of different shapes, and therefore first housings 1 of different shapes, may be used depending on the installation space of the electronic device.

[0182] The following describes the layout of support columns 11 for various possible vapor chamber shapes, using Figures 18 to 22. Vapor chambers of other shapes can refer to the layout principles for support columns 11 described herein. Figure 18 is a schematic diagram of the tenth configuration of the first housing, Figure 19 is a schematic diagram of the eleventh configuration of the first housing, Figure 20 is a schematic diagram of the twelfth configuration of the first housing, Figure 21 is a schematic diagram of the thirteenth configuration of the first housing, and Figure 22 is a schematic diagram of the fourteenth configuration of the first housing.

[0183] As shown in Figures 18 to 21, 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.

[0184] The middle of the first shell 1 is close to the heat source 1000. Therefore, the middle 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. Because the evaporation end is located in the middle, there are two condensation ends and two middle sections. The gaseous working fluid is divided into two paths from the evaporation end to the corresponding condensation end.

[0185] 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.

[0186] Combining the shapes of the wing-shaped support columns shown in Figures 18 to 21 and Figure 8 , it can be seen that when the first side surface 1123 and the second side surface 1124 in Figure 8 are both arc surfaces, they are the wing-shaped support columns shown in Figures 18 to 21 . Therefore, the wing-shaped support columns in Figures 18 to 21 also satisfy the following: 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.

[0187] To ensure the heat dissipation requirements of a narrow vapor chamber, the layout or shape of support columns 11, as described in all the above embodiments, can be modified, and will not be detailed here. This embodiment further utilizes support columns 11 to guide the flow of the gaseous working medium, ensuring a more uniform distribution of the gaseous working medium and ensuring heat dissipation requirements.

[0188] As shown in FIG18 , 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. The other side can refer to the description below.

[0189] The second support columns 112 are arranged in a single row along the second direction and are symmetrically arranged about the first direction. The second support columns 112 have varying lengths, gradually increasing in length from the center of the first housing 1 toward the sides in the second direction. The second support columns 112 are flush with each other at the ends near the evaporation end, while they are of varying length at the ends near the condensation end.

[0190] That is, along the second direction, the length of the steam channel 12 in the middle section near 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.

[0191] Because the third support columns 113 are arranged in a staggered manner, the turbulent flow causes the resistance of the steam channels 12 between the third support columns 113 to be greater than the resistance of the steam channels 12 between the second support columns 112. By shortening the length of the steam channels 12 near the middle position in the middle section, the gaseous working medium passing through the steam channels 12 located in the middle position of the middle section can reach the condensing end first. After the gaseous working medium reaches the bottom of the condensing section, the resistance of the steam channels 12 located in the middle position of the condensing end will increase; as a result, some gaseous working medium will enter the condensing end area from the steam channels 12 at both ends of the middle section, making the distribution of gaseous working medium in the entire accommodating cavity more uniform, effectively improving heat exchange efficiency.

[0192] It can be seen from the above-mentioned guiding effect of 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.

[0193] As shown in FIG19 , 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. The other side can refer to the description below.

[0194] The second support columns 112 are arranged in a single row along the second direction and are symmetrically arranged about the first direction. The second support columns 112 have varying lengths, gradually increasing in length from the center of the first housing 1 toward the sides in the second direction. The ends of the second support columns 112 near the evaporation end and the ends near the condensation end are not flush. A line connecting the ends of the second support columns 112 near the first support column 111 and the ends near the third support column 113 form a V-shape. The second support columns 112 are arranged symmetrically about the second direction.

[0195] 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 will be greater than the number of first support columns 111 at both ends of the evaporation end.

[0196] 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.

[0197] 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 medium in the middle position of the evaporation end can be diffused to the two sides of the evaporation end where the resistance is smaller, which is conducive to the diffusion of the gaseous working medium, thereby avoiding the problem of local concentration of gaseous working medium in the heat spreader and the occurrence of local hot spots.

[0198] For the arrangement of the second support column 112 near the condensing end in FIG19 and the effects produced, please refer to the contents of the second support column 112 described in FIG18 , which will not be repeated here.

[0199] 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 medium in the vapor chamber and the occurrence of local hot spots can be further avoided.

[0200] 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.

[0201] Take the narrow heat sink corresponding to the first housing 1 shown in FIG. 20 and FIG. 21 as an example for explanation:

[0202] As shown in Figures 20 and 21, support columns 11 are machined on the first shell 1. 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. The position close to the heat source 1000 is the evaporation end, and the position away from the heat source 1000 is the condensation end. The middle section is between the condensation end and the evaporation end.

[0203] The first support column 111 is located at the evaporation end, the second support column 112 is located in 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 described with reference to FIG19 and will not be repeated here.

[0204] The first support column 111 in Figure 20 is a rectangular support column extending along the length direction of the first shell 1. Since the rectangular support column can further reduce the 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.

[0205] 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 .

[0206] Based on the above embodiment, the cross-sectional shape of the third support column 113 in FIG21 includes, but is not limited to, a rectangle, an ellipse, or an airfoil. Taking a rectangular third support column 113 as an example, since a rectangular support column can further reduce resistance compared to a circular support column, configuring the third support column 113 in a rectangular shape can improve the efficiency of gas-liquid circulation and ensure effective heat dissipation.

[0207] 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 in this embodiment.

[0208] The support column 11 provided on the irregular-shaped first shell 1 is described below with reference to FIG. 22 .

[0209] As shown in Figure 22, the first housing 1 is L-shaped. One end of the L-shaped member, located near the heat source 1000, is the evaporation end, while the other end is the condensation end. The evaporation end is provided with a first cylindrical support column 111; a second wing-shaped support column 112 is provided in the middle section; and the condensation end is provided with a third cylindrical support column 113 arranged in a staggered pattern.

[0210] 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 direction 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.

[0211] 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.

[0212] 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.

[0213] The shapes of the first support column 111 , the second support column 112 , and the third support column 113 herein can be arbitrarily combined.

[0214] 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 repeated here.

Claims

1. A heat sink, It is characterized in that include: A first shell and a second shell, wherein the first shell is sealedly connected to the second shell and a containing cavity is formed therebetween; A support column, wherein the support column is fixed between the first shell and the second shell, wherein a position of the first shell close to a heat source is an evaporation end, and a position of the first shell far from the heat source is a condensation end; The cross section of at least part of the support column has a length in a first direction greater than a length in 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.

2. The heat sink according to claim 1, It is characterized in that The support column, whose cross-section has a length along the first direction greater than a length along the second direction, satisfies: along the first direction, the width of the support column increases first and then decreases.

3. The heat sink according to claim 1, It is characterized in that The support column comprises: a first support column, the first support column being located at an evaporation end of the first shell; a second support column, the second support column being located in a middle section between the evaporation end and the condensation end, and a length of a cross section of the second support column along the first direction being greater than a length along the second direction; A third supporting column is located at the condensing end of the first shell.

4. The heat sink according to claim 3, It is characterized in that 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.

5. The heat sink according to claim 3 or 4, It is characterized in that 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.

6. The vapor chamber according to any one of claims 4 to 5, It is characterized in that At least one of the first supporting column, the second supporting column and the third supporting column satisfies: along the first direction, the width first increases and then decreases.

7. The vapor chamber according to any one of claims 3 to 6, It is characterized in that At least one of the first support column, the second support column and the third support column is an airfoil support column, and a cross section of the airfoil support column includes: A leading edge and a trailing edge, wherein both the leading edge and the trailing edge are cambered surfaces, and an opening angle of the leading edge is greater than an opening angle 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.

8. The heat sink according to claim 7, It is 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.

9. The vapor chamber according to any one of claims 3 to 6, It is characterized in that At least one of the first support column, the second support column and the third support column is a conical support column, and a cross section of the conical support column includes: A first guide segment, a first connecting segment, and a second guide segment are connected in sequence, wherein along the direction from the first guide segment to the second guide segment, the width of the first guide segment gradually increases, the width of the second guide segment gradually decreases, the width of the first connecting segment is equal, and the first guide segment faces the heat source.

10. The vapor chamber according to claim 9, It is characterized in that The first guide segment is triangular, and the third guide segment is semi-elliptical or triangular.

11. The vapor chamber according to claim 9 or 10, It is characterized in that The cone angle of the first guide section ranges from 20° to 80°.

12. The vapor chamber according to any one of claims 3 to 11, It is characterized in that From the middle of the first shell in the second direction to both sides, the length of the steam channel formed by adjacent second support columns in the first direction gradually increases.

13. The vapor chamber according to claim 12, It is characterized in that The length of the second supporting column gradually increases from the middle of the first shell in the second direction to both sides.

14. The vapor chamber according to claim 13, It is characterized in that One end of the plurality of second support columns close to the first support column is flush, or a line connecting one end of the plurality of second support columns close to the first support column is in a V shape.

15. The vapor chamber according to claim 14, It is characterized in that The first support columns are evenly distributed along the first direction, and the third support columns are staggered at the condensation end.

16. The vapor chamber according to any one of claims 1 to 14, It is characterized in that The density of the support pillars gradually decreases in a direction away from the heat source.

17. The vapor chamber according to any one of claims 1 to 16, It is characterized in that The size of the support column gradually decreases from the heat source to the direction away from the heat source.

18. The vapor chamber according to any one of claims 1 to 17, It is characterized in that It also includes a capillary structure, which is located in the accommodating cavity.

19. An electronic device, comprising a vapor chamber, wherein the vapor chamber is the vapor chamber according to any one of claims 1 to 18.

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