Heat pipe

Abstract

The present application discloses a heat pipe, comprising: a body, which is filled with a working fluid inside, and the interior of the body is partitioned to form a first region and a second region. A plurality of channels are formed in the second region, and two ends of the channels are an inlet end and an outlet end, and the inlet end and the outlet end are respectively communicated with the first region; a position on the outer side wall of the body corresponding to the first region is used for abutting against a heat source; a wick, which is arranged on the bottom side of the first region and is used for guiding the working fluid, and the guiding direction is from a position of the wick close to the inlet end to a position of the wick close to the outlet end; support columns, which are arranged on the upper side of the first region; there are a plurality of support columns, and the distance between the support columns at the position corresponding to the inlet end is greater than the distance between the support columns at the position corresponding to the outlet end. In the use environment against gravity of the heat pipe of the present application, the liquid working fluid can also normally flow back to the wick under the thrust of the steam.

Description

Technical Field

[0001] The present application relates to the technical field of heat dissipation devices, and particularly relates to a vapor chamber. Background Art

[0002] A vapor chamber is a structural component that uses the phase change of a liquid working medium to rapidly evaporate the heat near a heat source and transfer it to a two-dimensional area for condensation heat dissipation, and has been widely used in fields such as intelligent electronic devices, new energy vehicles, and household appliances.

[0003] In related technologies, most conventional ordinary vapor chamber structures include an upper cover and a lower cover. The upper cover forms support columns through etching, and the lower cover lays a wick through etching. The upper cover and the lower cover are combined to form a vacuum cavity. The wick has a capillary pumping force function, which can realize the reflux of the liquid working medium to the heat source to facilitate the smooth progress of the next evaporation-condensation cycle.

[0004] Among them, the capillary pumping force function is an inherent property of the wick. When the vapor chamber is used in an anti-gravity environment, the capillary pumping force function of the wick has a certain limit range. Therefore, in an anti-gravity environment, the heat dissipation effect of the vapor chamber is greatly reduced.

[0005] In addition, the spacing and size of the support columns directly affect the condensation and evaporation of the working medium. The larger the spacing of the support columns, although the steam flow resistance decreases, the cavity is prone to depression; the smaller the diameter and spacing of the support columns, the greater the steam flow resistance, and the heat transfer performance of the vapor chamber decreases. And when the steam flows through the cylindrical support columns, the von Kármán vortex street phenomenon may occur, resulting in insufficient steam to push the liquid film hanging on the wall forward, that is, the thrust force of the steam on the liquid film is less than the adhesion force between the liquid film and the cavity wall, resulting in slow reflux of the liquid working medium. Summary of the Invention

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. For this reason, the present application proposes a vapor chamber that can have a good heat dissipation effect.

[0007] The vapor chamber according to the first aspect embodiment of the present application includes:

[0008] A body filled with a working medium inside, and the interior of the body is partitioned into a first region and a second region. A plurality of channels are formed in the second region, and both ends of the channels are an inlet end and an outlet end, and the inlet end and the outlet end are respectively communicated with the first region; the outer side wall of the body at a position corresponding to the first region is used to abut against a heat source;

[0009] A wick is arranged at the bottom side of the first region for guiding the working medium, and the guiding direction is from a position of the wick close to the outlet end to a position of the wick close to the inlet end;

[0010] Support columns are provided on the upper side of the first region; there are several support columns, and the distance between the support columns corresponding to the position of the inlet end is greater than the distance between the support columns corresponding to the position of the outlet end.

[0011] The heat pipe according to the first aspect of the present application has at least the following beneficial effects: The outer wall of the first region of the body is attached to the heat source, and part of the heat of the heat source is transferred to the wick in the first region. It should be understood that the working fluid in the wick is in a liquid state. After the liquid working fluid absorbs a certain amount of heat, it will evaporate into a gaseous working fluid, that is, it becomes steam. Since the distance between the support columns corresponding to the position of the inlet end is greater than the distance between the support columns corresponding to the position of the outlet end, and the guiding direction of the wick is from the position close to the outlet end to the position close to the inlet end, therefore, most of the gaseous working fluid will enter the channel from the inlet end. After the gaseous working fluid enters the channel, since the second region is far from the heat source, it will gradually condense into a liquid working fluid and dissipate heat at the second region. The uncondensed gaseous working fluid will push the liquid working fluid to continue to move forward along the channel and flow back to the wick in the first region from the outlet end. It can be understood that since the channel is relatively narrow, the thrust of the gaseous working fluid on the liquid working fluid is relatively concentrated and the thrust on the liquid working fluid is large, which can accelerate the reflux of the liquid working fluid. Moreover, in the use environment against gravity of the heat pipe of the present application, the liquid working fluid can also normally flow back to the wick under the thrust of the steam.

[0012] According to some embodiments of the present application, the size of the support column corresponding to the position of the inlet end is smaller than the size of the support column corresponding to the position of the outlet end.

[0013] According to some embodiments of the present application, the distribution number of the support columns corresponding to the position of the inlet end is smaller than the distribution number of the support columns corresponding to the position of the outlet end.

[0014] According to some embodiments of the present application, a gap is formed between the support column corresponding to the position of the inlet end and the wick, and the support column corresponding to the position of the outlet end abuts against the wick.

[0015] According to some embodiments of the present application, the caliber of the inlet end is larger than the caliber of the outlet end.

[0016] According to some embodiments of the present application, the first region is formed at one end of the body, and the channel partially extends to the other end of the body.

[0017] According to some embodiments of the present application, the channel has a U-shaped structure, and the closed end of the U-shaped structure extends to the other end of the body.

[0018] According to some embodiments of the present application, the body is formed with a hollowed-out region corresponding to the second region.

[0019] According to some embodiments of the present application, the body includes an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged to cover each other, the support column is arranged at a position of the upper cover plate corresponding to the first region, and the liquid absorption core is arranged at a position of the lower cover plate corresponding to the first region; grooves are formed in both the upper cover plate and the lower cover plate corresponding to the second region, and the grooves of the upper cover plate and the grooves of the lower cover plate are arranged corresponding to each other and constitute the channel.

[0020] According to some embodiments of the present application, a groove is formed at a position of the liquid absorption core corresponding to the inlet end.

[0021] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. Description of the Drawings

[0022] The following further describes the present application with reference to the drawings and embodiments, where:

[0023] Figure 1 is a cross-sectional view of the heat pipe of the embodiment of the present application, where the arrangement form of the support column is the second type;

[0024] Figure 2 is a cross-sectional view of the heat pipe of the embodiment of the present application, where the arrangement form of the support column is the first type;

[0025] Figure 3 is a cross-sectional view of the heat pipe of the embodiment of the present application in another direction;

[0026] Figure 4 is a cross-sectional view of the heat pipe of the embodiment of the present application, where the channel is in the first branch form;

[0027] Figure 5 is a cross-sectional view of the heat pipe of the embodiment of the present application, where the channel is in the second branch form;

[0028] Figure 6 is an exploded view of the heat pipe of the embodiment of the present application;

[0029] Figure 7 is Figure 6 another perspective.

[0030] Reference Signs:

[0031] Body 100, groove 101, upper cover plate 110, lower cover plate 120;

[0032] First region 200; liquid absorption core 210, groove 211, interval 212; support column 220;

[0033] The second region 300; channels 310, inlet end 311, outlet end 312, main channel 313, branch channel 314, partition 315; hollowed-out region 320. Detailed implementation manners

[0034] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation of the present application.

[0035] In the description of the present application, it should be understood that with regard to the orientation description, such as the upper, lower, front, rear, left, right, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0036] In the description of the present application, the meaning of "several" is more than one, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, and understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0037] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0038] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0039] Refer to Figures 1 to 7 According to the heat pipe of the embodiment of the first aspect of the present application, it includes: a body 100, a wick 210, and a support column 220.

[0040] The interior of the body 100 is filled with a working fluid, and the interior of the body 100 is partitioned to form a first region 200 and a second region 300. A number of channels 310 are formed in the second region 300. The two ends of the channel 310 are an inlet end 311 and an outlet end 312, and the inlet end 311 and the outlet end 312 are respectively communicated with the first region 200. The outer sidewall of the body 100 at the position corresponding to the first region 200 is used to abut against a heat source, so that the first region 200 is heated.

[0041] The wick 210 is arranged on the bottom side of the first region 200. Specifically, the bottom side corresponds to the outer sidewall where the heat source is placed, so that the heat source can better transfer heat to the wick 210, thereby enabling the liquid working fluid in the wick 210 to evaporate into a gaseous working fluid. The wick 210 is used to guide the working fluid, and the guiding direction is from the position of the wick 210 close to the outlet end 312 to the position of the wick 210 close to the inlet end 311. Specifically, the wick 210 guides the working fluid through capillary action.

[0042] The support columns 220 are arranged on the upper side of the first region 200. There are a number of support columns 220. The distance between the support columns 220 at the position corresponding to the inlet end 311 is greater than the distance between the support columns 220 at the position corresponding to the outlet end 312. It can be understood that the distance between the support columns 220 near the inlet end 311 is larger, which is conducive to the passage of the gaseous working fluid, and the distance between the support columns 220 near the outlet end 312 is smaller, which is not conducive to the passage of the gaseous working fluid.

[0043] It can be understood that the outer sidewall of the first region 200 of the body 100 is attached to the heat source, and the heat source includes electronic components such as a CPU, a PCB board, etc. Part of the heat of the heat source is transferred to the wick 210 in the first region 200. It should be understood that the working fluid in the wick 210 is in a liquid state. After the liquid working fluid absorbs a certain amount of heat, it will evaporate into a gaseous working fluid, that is, it becomes steam. Since the distance between the support columns 220 at the position corresponding to the inlet end 311 is greater than the distance between the support columns 220 at the position corresponding to the outlet end 312, and the guiding direction of the wick 210 is from the position close to the outlet end 312 to the position close to the inlet end 311, therefore, most of the gaseous working fluid will enter the channel 310 from the inlet end 311.

[0044] After the gaseous working medium enters the channel 310, since the second region 300 is far from the heat source, it will gradually condense into a liquid working medium and dissipate heat at the second region 300. The uncondensed gaseous working medium will push the liquid working medium to continue moving forward along the channel 310 and flow back to the wick 210 of the first region 200 from the outlet end 312. It can be understood that due to the relatively narrow channel 310, the thrust of the gaseous working medium on the liquid working medium is relatively concentrated, with a large thrust on the liquid working medium, which can accelerate the reflux of the liquid working medium. Moreover, in the use environment against gravity of the heat pipe of the present application, the liquid working medium can also normally flow back to the wick 210 under the thrust of the steam.

[0045] There are two forms of setting for the distance between the support columns 220 at the position corresponding to the inlet end 311 being greater than the distance between the support columns 220 at the position corresponding to the outlet end 312: Refer to Figure 2 , First, the size of the support columns 220 at the position corresponding to the inlet end 311 is smaller than the distance between the support columns 220 at the position corresponding to the outlet end 312, and the specific implementation form of the distance between the support columns 220 at the position corresponding to the outlet end 312 being greater than the distance between the support columns 220 at the position corresponding to the outlet end 312 is at least the size of the support columns 220 at the position 312; Refer to Figure 1 , Second, the distribution quantity of the support columns 220 at the position corresponding to the inlet end 311 is less than the distribution quantity of the support columns 220 at the position corresponding to the outlet end 312, that is, the number of the support columns 220 at the position corresponding to the inlet end 311 is less, the distribution distance between the support columns 220 is larger, the number of the support columns 220 at the position corresponding to the outlet end 312 is more, and the distribution distance between the support columns 220 is smaller and denser. It should be noted that other implementation forms can also be adopted, or a combination of the above two implementation forms can be used, which is not limited here.

[0046] In addition to controlling the distance between the support columns 220 at the positions of the inlet end 311 and the outlet end 312 as described above, the present application can also set the following three schemes to further improve the smoothness of the gaseous working medium entering from the inlet end 311 and reduce the possibility of the gaseous working medium entering from the outlet end 312, where:

[0047] The first setting scheme is: Refer to Figure 3 , an interval 212 is formed between the support columns 220 at the position corresponding to the inlet end 311 and the wick 210, and the support columns 220 at the position corresponding to the outlet end 312 are in contact with the wick 210.

[0048] It can be understood that the support columns 220 at the position near the inlet end 311 are shorter than the support columns 220 at the position near the outlet end 312, and an interval 212 is formed between the support columns 220 near the inlet end 311 and the wick 210, which is more conducive to the inflow of the gaseous working medium from the inlet end 311. In addition, the support columns 220 near the outlet end 312 are in contact with the wick 210, and the support columns 220 act on the gaseous working medium, making it more difficult for the gaseous working medium to flow in from the outlet end 312.

[0049] In addition, in order to further increase the interval 212 between the support columns 220 near the inlet end 311 and the wick 210, grooves 211 are formed at the position of the wick 210 corresponding to the inlet end 311, that is, a plurality of grooves 211 are formed on the side of the wick 210 near the inlet end 311 to increase the interval 212, so that the gaseous working medium can more easily enter the inlet end 311.

[0050] In some embodiments, a long strip-shaped support column 220 can be arranged near the outlet end 312 to block the upper part of the outlet end 312 in a large area or completely. It can be understood that the upper part of the outlet end 312 corresponds to the support column 220, and the lower part of the outlet end 312 corresponds to the wick 210. By blocking the upper part of the outlet end 312 in a large area or completely, the liquid working medium can only flow back to the wick 210 through the lower part of the outlet end 312, resulting in that the gaseous working medium in the first region 200 cannot enter the channel 310 through the upper part of the outlet end 312.

[0051] The second setting scheme is as follows: Refer to Figure 3 , the caliber of the inlet end 311 is larger than that of the outlet end 312. It should be noted that the caliber refers to the width dimension of the inlet end 311 or the outlet end 312 of the channel 310. It can be understood that the larger caliber of the inlet end 311 than that of the outlet end 312 makes it easier for the gaseous working medium to enter from the inlet end 311 and more difficult to enter from the outlet end 312.

[0052] In this embodiment, the channel 310 is wider near the inlet end 311 and narrower near the outlet end 312. It should be noted that due to the change in the width of the channel 310, the spacing between the channels 310 in the second region 300 near the inlet end 311 may be relatively large, and the usable area of the second region 300 cannot be effectively utilized. To increase the usable area of the second region 300, the channel 310 forms branches near the outlet end 312, that is, the number of channels 310 changes, from a small number of channels 310 to a large number of channels 310. Thus, the number of inlet ends 311 will also be less than the number of outlet ends 312. Specifically, a section of the channel 310 that forms the inlet end 311 is defined as the main channel 313, and a section of the channel 310 that forms the outlet end 312 is the branch channel 314. The width of the main channel 313 is wider than that of the branch channel 314. Due to the change in the number of channels 310 and the relatively large number of branch channels 314, even when the width of the branch channel 314 is small, the branch channel 314 can be laid over a large area in the second region 300, increasing the usable area of the second region 300. Also, it avoids the problem of a relatively low return flow velocity of the working fluid caused by the small width of the branch channel 314, that is, multiple branch channels 310 ensure the return flow velocity of the working fluid. Moreover, it avoids the problem that it is difficult for the uncondensed gaseous working fluid to condense after entering the branch channel 314 due to the small size of the branch channel 314, that is, multiple branch channels 310 ensure that the gaseous working fluid in the branch channel 314 has sufficient heat dissipation space to ensure its condensation speed.

[0053] Regarding the branching form of the channel 310, refer to Figure 4 , the first branching form is that the channel 310 is directly divided into two channels 310, that is, one main channel 313 is divided into at least two branch channels 314. For example, the number of inlet ends 311 is three, corresponding to three main channels 313, and the number of outlet ends 312 is four, corresponding to four branch channels 314. That is, when the channel 310 extends from the inlet end 311 to a certain position, one main channel 313 branches into two branch channels 314; refer to Figure 5 , the second branching form is that a partition 315 is formed at the position where the channel 310 branches, that is, a partition 315 is formed between the main channel 313 and the branch channel 314, so that after the working fluid flows to the position of the partition 315, it can arbitrarily select a branch channel 314.

[0054] In other embodiments, the channel 310 only has dimensional differences at the inlet end 311 and the outlet end 312, and the dimensions at other positions do not change.

[0055] It can be understood that through the above solution, most of the gaseous working fluid in the first region 200 will enter the channel 310 from the inlet end 311, and only a small part of the gaseous working fluid may flow towards the outlet end 312. It should be noted that after a large amount of gaseous working fluid enters from the inlet end 311, even the small part of the gaseous working fluid that enters the channel 310 from the outlet end 312 will be pushed back by the gaseous working fluid that enters the channel 310 from the inlet end 311.

[0056] In order to effectively utilize the usage space of the body 100 of the heat pipe of the present application, referring to Figure 1 、 Figure 6 、 Figure 7 The first region 200 is formed at one end of the body 100, and the channel 310 partially extends to the other end of the body 100. It can be understood that the first region 200 and the second region 300 cover a large area of the body 100. In addition, the part of the channel 310 can extend to the end of the body 100 far from the first region 200, which can improve the condensation speed of the gaseous working fluid in the channel 310.

[0057] Specifically, the channel 310 has a U-shaped structure, and the closed end of the U-shaped structure extends to the other end of the body 100. That is, the channel 310 is designed as a semi-circular channel.

[0058] In order to improve the condensation speed of the gaseous working fluid in the channel 310, referring to Figure 1 、 Figure 6 、 Figure 7 The body 100 is formed with a hollowed-out area 320 corresponding to the second region 300. It can be understood that the contact area between the outer wall of the body 100 corresponding to the second region 300 and the air is increased through the hollowed-out area to improve the condensation speed of the gaseous working fluid.

[0059] Specifically, the hollowed-out area 320 is formed in the middle of the second region 300, that is, it is arranged in the middle of the U-shaped channel 310, so as to improve the condensation speed of the gaseous working fluid in the channel 310 near the center of the second region 300 and improve the heat dissipation effect.

[0060] Regarding the specific structure of the body 100, referring to Figure 6 、 Figure 7 The body 100 includes an upper cover plate 110 and a lower cover plate 120. The upper cover plate 110 and the lower cover plate 120 are arranged to cover each other. The support columns 220 are arranged at the position of the upper cover plate 110 corresponding to the first region 200, and the wick 210 is arranged at the position of the lower cover plate 120 corresponding to the first region 200; grooves 101 are formed on the upper cover plate 110 and the lower cover plate 120 corresponding to the second region 300, and the grooves 101 on the upper cover plate 110 and the grooves 101 on the lower cover plate 120 are arranged correspondingly and constitute the channel 310.

[0061] It can be understood that the main body is formed by covering the upper cover plate 110 and the lower cover plate 120. The support columns 220 and the liquid absorption cores 210 are respectively laid at the positions of the upper cover plate 110 and the lower cover plate 120 corresponding to the first region 200, and the grooves 101 are respectively formed by etching corresponding to the second region 300. When the upper cover plate 110 and the lower cover plate 120 are covered, the grooves 101 on the upper cover plate 110 are butted against the grooves 101 on the lower cover plate 120 to form the channel 310.

[0062] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments, and various changes can be made without departing from the gist of the present application within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. Heat pipe, characterized in that, Comprising: A body filled with a working fluid inside, and the interior of the body is partitioned to form a first region and a second region. A number of channels are formed in the second region, and both ends of the channels are an inlet end and an outlet end, and the inlet end and the outlet end are respectively communicated with the first region; the outer side wall of the body at the position corresponding to the first region is used to abut against a heat source; A wick is arranged at the bottom side of the first region for guiding the working fluid, and the guiding direction is from the position of the wick close to the outlet end to the position of the wick close to the inlet end; Support columns are arranged at the upper side of the first region; there are a number of the support columns, and the distance between the support columns at the position corresponding to the inlet end is greater than the distance between the support columns at the position corresponding to the outlet end.

2. The heat pipe according to claim 1, wherein The size of the support columns at the position corresponding to the inlet end is smaller than the size of the support columns at the position corresponding to the outlet end.

3. The heat pipe according to claim 1, characterized in that The distribution quantity of the support columns at the position corresponding to the inlet end is less than the distribution quantity of the support columns at the position corresponding to the outlet end.

4. The heat pipe according to claim 1, wherein, An interval is formed between the support columns at the position corresponding to the inlet end and the wick, and the support columns at the position corresponding to the outlet end abut against the wick.

5. The heat sink according to claim 1, characterized in that The caliber of the inlet end is larger than the caliber of the outlet end.

6. The heat pipe according to claim 1, characterized in that, The first region is formed at one end of the body, and part of the channels extends to the other end of the body.

7. The heat sink according to claim 6, wherein The channels are in a U-shaped structure, and the closed end of the U-shaped structure extends to the other end of the body.

8. The heat sink according to claim 1, wherein The body is formed with a hollowed-out region corresponding to the second region.

9. The heat pipe according to claim 1, wherein, The body includes an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate are arranged in a covering manner, the support columns are arranged at the position of the upper cover plate corresponding to the first region, and the wick is arranged at the position of the lower cover plate corresponding to the first region; grooves are formed in the upper cover plate and the lower cover plate corresponding to the second region, and the grooves of the upper cover plate and the grooves of the lower cover plate are correspondingly arranged and constitute the channels.

10. The heat sink according to claim 1, characterized in that, A groove is formed at the position of the wick corresponding to the inlet end.

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