CN113008061B - Soaking plate condensation end of ultrathin bionic vein gradient liquid absorption core structure - Google Patents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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Abstract
Description
技术领域technical field
本申请涉及均热板技术领域,尤其涉及一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端。The present application relates to the technical field of vapor chambers, and in particular, to a condensation end of a vapor chamber with an ultra-thin bionic leaf vein gradient liquid-absorbing core structure.
背景技术Background technique
在热交换领域,换热管技术能够利用工质相变过程的潜热把高密度热流及时转移,从而成为解决散热问题的有效方法。而平板热管是一种根据热管工作原理而设计的新型散热介质,工作原理与热管相似,但是与热管一维线性的传热方式相比,平板热管的传热方式为二维面上传热,因此具有更好的传热性能与均温性。平板热管主要结构有外壳、吸液芯、工质等,工作原理为当热量由热源通过平板热管的蒸发区时,在低真空度的腔体内,工质液体沸腾气化,在压力差的作用下,气体流向冷凝区,遇冷凝结放热,并在毛细力的作用下沿吸液芯回流回蒸发区,而冷凝面的热量由平板热管外部其他散热方式带走。虽然工作原理相似,但是与热管一维线性的传热方式相比,平板热管的传热方式为二维面上传热,因此具有更好的传热性能与均温性。In the field of heat exchange, heat exchange tube technology can use the latent heat of the phase change process of the working medium to transfer high-density heat flow in time, thus becoming an effective method to solve the problem of heat dissipation. The plate heat pipe is a new type of heat dissipation medium designed according to the working principle of the heat pipe. The working principle is similar to that of the heat pipe. Has better heat transfer performance and temperature uniformity. The main structure of the flat heat pipe includes shell, liquid absorption core, working medium, etc. The working principle is that when the heat passes through the evaporation area of the flat heat pipe from the heat source, in the cavity of low vacuum degree, the working medium liquid boils and vaporizes, and the effect of the pressure difference Under the action of capillary force, the gas flows to the condensation area, and when it encounters condensation, it releases heat and flows back to the evaporation area along the wick under the action of capillary force, and the heat on the condensation surface is taken away by other heat dissipation methods outside the flat heat pipe. Although the working principle is similar, compared with the one-dimensional linear heat transfer method of the heat pipe, the heat transfer method of the plate heat pipe is two-dimensional surface heat transfer, so it has better heat transfer performance and temperature uniformity.
随着科技的发展,热管的种类越来越丰富。目前,按结构形式区分可分为普通热管、分离式热管、毛纫泵回路热管、微型热管、平板热管、径向热管等;其中平板热管由于其具有较大的热扩散面积而被广泛使用。而现有的平板热管往往回流功能不够完善,不利于传热介质的循环。With the development of science and technology, the types of heat pipes are becoming more and more abundant. At present, according to the structure, it can be divided into ordinary heat pipes, separate heat pipes, wool pump loop heat pipes, micro heat pipes, flat heat pipes, radial heat pipes, etc. Among them, flat heat pipes are widely used because of their large heat diffusion area. However, the existing flat-plate heat pipes often have insufficient reflow function, which is not conducive to the circulation of the heat transfer medium.
发明内容SUMMARY OF THE INVENTION
有鉴于此,本申请的目的是提供一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,用于解决现有的均热板回流不够完善,不利于传热介质的循环的问题。In view of this, the purpose of this application is to provide an ultra-thin bionic leaf vein gradient liquid absorbing core structure of the cooling end of the soaking plate, which is used to solve the problem that the existing soaking plate reflux is not perfect, which is not conducive to the circulation of the heat transfer medium. question.
为达到上述技术目的,本申请提供一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,其特征在于,包括:冷凝端主体与中心吸液芯;In order to achieve the above-mentioned technical purpose, the present application provides an ultra-thin cooling end of a soaking plate with a bionic leaf vein gradient liquid-absorbing core structure, which is characterized in that it includes: a main body of the condensation end and a central liquid-absorbing core;
所述冷凝端主体的第一端面上设置有冷凝中心以及仿生叶脉槽道;A condensation center and a bionic leaf vein channel are arranged on the first end surface of the condensation end main body;
所述中心吸液芯设置于所述冷凝中心;The central liquid-absorbing wick is arranged in the condensation center;
所述仿生叶脉槽道沿所述冷凝中心往外周发散且与所述中心吸液芯相连通。The bionic leaf vein channel diverges to the outer periphery along the condensation center and communicates with the central liquid absorbent core.
优选地,还包括周向吸液芯;Preferably, it also includes a circumferential absorbent core;
所述周向吸液芯设置于所述冷凝端主体上,连通所述仿生叶脉槽道,且绕所述中心吸液芯呈圆周均布。The circumferential liquid-absorbing core is arranged on the condensation end main body, communicates with the bionic leaf vein channel, and is evenly distributed around the central liquid-absorbing core.
优选地,所述仿生叶脉槽道具体包括一级叶脉槽道、二级叶脉槽道与间隔槽道;Preferably, the bionic vein channel specifically includes a first-level vein channel, a second-level vein channel and an interval channel;
所述一级叶脉槽道连通所述中心吸液芯且绕所述冷凝中心发散性圆周均布;The first-level vein channels are connected to the central liquid absorbing core and are evenly distributed around the condensing center divergent circumference;
所述间隔槽道设置于相邻所述一级叶脉槽道之间,且连通所述中心吸液芯;The interval channel is arranged between the adjacent first-level vein channels and communicates with the central liquid absorbing core;
所述二级叶脉槽道连通所述间隔槽道与一级叶脉槽道。The secondary vein channel communicates with the interval channel and the primary vein channel.
优选地,所述一级叶脉槽道的槽宽由末端往所述冷凝中心方向渐缩。Preferably, the groove width of the first-stage vein channel is tapered from the end toward the condensation center.
优选地,所述二级叶脉槽道的槽宽由所述间隔槽道往所述一级叶脉槽道方向渐缩。Preferably, the groove width of the secondary vein channel is tapered from the interval channel to the direction of the primary vein channel.
优选地,所述周向吸液芯设置于所述冷凝端主体的外周与所述中心吸液芯之间的二等分位置。Preferably, the circumferential liquid-absorbent core is disposed at a bisected position between the outer circumference of the condensation end main body and the central liquid-absorbent core.
优选地,所述中心吸液芯与周向吸液芯具体均为金属丝网烧结成型的多孔结构或泡沫金属烧结成型的多孔结构。Preferably, the central liquid-absorbent core and the circumferential liquid-absorbent core are each a porous structure formed by sintering a metal wire mesh or a porous structure formed by sintering a metal foam.
优选地,所述冷凝端主体往所述第一端面方向凸起,且厚度沿所述冷凝中心往外周逐渐减小。Preferably, the condensation end main body is convex toward the first end face, and the thickness gradually decreases along the condensation center toward the outer periphery.
优选地,所述仿生叶脉槽道沿槽道的末端往所述冷凝中心疏水性递减。Preferably, the hydrophobicity of the bionic leaf vein channel decreases toward the condensation center along the end of the channel.
优选地,所述槽道表面的递增疏水性为通过化学刻蚀结合浸涂处理得到。Preferably, the increasing hydrophobicity of the surface of the channel is obtained by chemical etching combined with dip coating treatment.
从以上技术方案可以看出,本申请提供一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,包括:冷凝端主体与中心吸液芯;所述冷凝端主体的第一端面上设置有冷凝中心以及仿生叶脉槽道;所述中心吸液芯设置于所述冷凝中心;所述仿生叶脉槽道沿所述冷凝中心往外周发散且与所述中心吸液芯相连通。通过在冷凝端主体上设置仿生叶脉槽道与中心吸液芯,中心吸液芯作为吸液中心,用于将均热板冷凝工质输向蒸发端;气体工质在冷凝端主体表面冷凝为液态,液态工质通过仿生叶脉槽道流动汇聚流向中心吸液芯,因此加快了工质回流速率,改善平板热管的冷凝回流性能,有利于传热工质的循环,提高了传热效率,使温度更快达到平衡,均温性更好。有效的解决现有的均热板回流不够完善,不利于传热介质的循环的问题。It can be seen from the above technical solutions that the present application provides an ultra-thin bionic leaf vein gradient liquid absorbing core structure with a cooling end of a vapor chamber, including: a condensation end main body and a central liquid absorbing core; a first end face of the condensation end main body A condensation center and a bionic leaf vein channel are arranged on the top; the central liquid absorbing core is arranged on the condensation center; the bionic leaf vein channel diverges to the outer periphery along the condensation center and communicates with the central liquid suction core. By arranging the bionic leaf vein channel and the central liquid-absorbing core on the main body of the condensation end, the central liquid-absorbing core is used as the liquid absorption center to transport the condensed working medium of the soaking plate to the evaporation end; the gas working medium is condensed on the surface of the main body of the condensation end as In liquid state, the liquid working medium flows and converges to the central liquid absorbing core through the bionic vein channel, so the reflux rate of the working medium is accelerated, the condensation and reflux performance of the flat heat pipe is improved, the circulation of the heat transfer working medium is facilitated, the heat transfer efficiency is improved, and the heat transfer efficiency is improved. The temperature reaches equilibrium faster and the temperature uniformity is better. It effectively solves the problem that the existing soaking plate reflow is not perfect and is not conducive to the circulation of the heat transfer medium.
附图说明Description of drawings
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其它的附图。In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.
图1为本申请实施例提供的一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端的正视图图;1 is a front view of a condensation end of a vapor chamber of an ultra-thin bionic leaf vein gradient liquid absorbing core structure provided by an embodiment of the application;
图2为本申请实施例提供的一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端的立体图;2 is a perspective view of a condensation end of a vapor chamber of an ultra-thin bionic leaf vein gradient liquid-absorbing core structure provided by an embodiment of the application;
图中:1、冷凝端主体;2、中心吸液芯;3、仿生叶脉槽道;4、周向吸液芯;31、一级叶脉槽道;32、二级叶脉槽道;33、间隔槽道。In the figure: 1. The main body of the condensation end; 2. The central suction core; 3. The bionic vein channel; 4. The circumferential suction core; 31. The first-level vein channel; 32. The second-level vein channel; 33. Interval channel.
具体实施方式Detailed ways
下面将结合附图对本申请实施例的技术方案进行清楚、完整地描述,显然,所描述的实施例是本申请的一部分实施例,而不是全部的实施例。基于本申请实施例中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本申请所请求保护的范围。The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by persons of ordinary skill in the art without creative work fall within the scope of the claimed protection of the present application.
在本申请实施例的描述中,需要说明的是,术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请实施例和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请实施例的限制。此外,术语“第一”、“第二”、“第三”仅用于描述目的,而不能理解为指示或暗示相对重要性。In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by "" etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, It is constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.
在本申请实施例的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”应做广义理解,例如,可以是固定连接,也可以是可更换连接,或一体地连接,可以是机械连接,也可以是电连接,可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以具体情况理解上述术语在本申请实施例中的具体含义。In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a The interchangeable connection, or the integral connection, can be a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application in specific situations.
本申请实施例公开了一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端。The embodiment of the present application discloses an ultra-thin bionic leaf vein gradient liquid absorbing core structure with a cooling end of a vapor chamber.
请参阅图1,本申请实施例中提供的一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,包括:冷凝端主体1与中心吸液芯2;冷凝端主体1的第一端面上设置有冷凝中心以及仿生叶脉槽道3;中心吸液芯2设置于冷凝中心;仿生叶脉槽道3沿冷凝中心往外周发散且与中心吸液芯2相连通。Referring to FIG. 1 , the cooling end of the vaporizing plate of an ultra-thin bionic leaf vein gradient liquid absorbing core structure provided in the embodiment of the present application includes: a condensation end
具体来说,气体工质在冷凝端主体1表面冷凝为液态后分布于仿生叶脉槽道3上,而仿生叶脉槽道3连通冷凝中心的中心吸液芯2;中心吸液芯2可以采用利用毛细作用的结构,借助毛细作用也即毛细作用力实现吸液,使液态工质由仿生叶脉槽道3汇聚到中心吸液芯2上,促进槽道液体工质的流动,之后传给蒸发端,促进均热板内工质构成循环回路,实现相变工质的相变与传热。Specifically, the gas working medium is condensed into a liquid state on the surface of the
以上为本申请实施例提供的实施例一,以下为本申请提供的实施例二,具体请参阅图1与图2。The above is the first embodiment provided by the embodiments of the present application, and the following is the second embodiment provided by the present application. For details, please refer to FIG. 1 and FIG. 2 .
一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,包括:冷凝端主体1与中心吸液芯2;冷凝端主体1的第一端面上设置有冷凝中心以及仿生叶脉槽道3;中心吸液芯2设置于冷凝中心;仿生叶脉槽道3沿冷凝中心往外周发散且与中心吸液芯2相连通。An ultra-thin bionic leaf vein gradient liquid absorbing core structure with a cooling end of a soaking plate, comprising: a condensation end
进一步地,还包括周向吸液芯4;周向吸液芯4绕中心吸液芯2圆周均布设置于冷凝端主体1上,且与仿生叶脉槽道连通,通过仿生叶脉槽道3连通中心吸液芯2。Further, it also includes a circumferential liquid-absorbing
具体来说,周向吸液芯4作为辅助吸液中枢,连通仿生叶脉槽道3,能吸收周围液态工质并直接传递给蒸发端,同时还起到支撑冷凝端主体1的作用。Specifically, the circumferential liquid-absorbing
进一步地,仿生叶脉槽道3具体包括一级叶脉槽道31、二级叶脉槽道32与间隔槽道33;一级叶脉槽道31连通中心吸液芯2且绕冷凝中心发散性圆周均布;间隔槽道33设置于相邻的一级叶脉槽道31之间,且连通中心吸液芯2;二级叶脉槽道32连通间隔槽道33与一级叶脉槽道31。Further, the
具体来说,在本实施例中,间隔槽道33与一级叶脉槽道31均连通中心吸液芯2,且绕中心吸液芯2呈圆周发散性间隔分布;二级叶脉槽道32作为一级叶脉槽道31的分支,分别连通间隔槽道33与一级叶脉槽道31;间隔槽道33收集的液态工质经一级叶脉槽道31汇聚至中心吸液芯2,使得冷凝端主体1表面温度更加均匀。Specifically, in this embodiment, the
进一步地,一级叶脉槽道31的槽宽由末端往冷凝中心方向渐缩;二级叶脉槽道32的槽宽由间隔槽道33往一级叶脉槽道31方向渐缩;仿生叶脉槽道3的沿槽道的末端往冷凝中心疏水性递减。Further, the groove width of the
具体来说,气体工质在冷凝端主体1表面冷凝为液态,液态工质通过槽道流动,槽宽渐缩的槽道利用叶脉尖端不断增大的毛细力,使得宽槽道处的液态工质自发流向窄槽道,即工质通过间隔槽道经二级叶脉槽道32流向一级叶脉槽道31,进而汇聚至中心吸液芯2。Specifically, the gas working medium is condensed into a liquid state on the surface of the
同时,槽道表面覆有疏水性涂层,且疏水性由末端往冷凝中心方向递减;具体来说,二级叶脉槽道32上的疏水性由连接间隔槽道33端往连接一级叶脉槽道31端递减;一级叶脉槽道31上的疏水性由末端往冷凝中心方向上递减。At the same time, the surface of the channel is covered with a hydrophobic coating, and the hydrophobicity decreases from the end to the center of condensation; specifically, the hydrophobicity on the
在本实施例中,槽道表面的递增疏水性为通过化学刻蚀结合浸涂处理得到,具体采用过氧化氢溶液进行刻蚀,再以硝酸银水溶液处理,最后以含乙醇、盐酸和全氟十二烷基三乙氧基硅烷(PFDTES)的混合溶液进行处理。In this embodiment, the increasing hydrophobicity of the surface of the channel is obtained by chemical etching combined with dip coating treatment, specifically using hydrogen peroxide solution for etching, then treatment with silver nitrate aqueous solution, and finally with ethanol, hydrochloric acid and perfluorinated water. The mixed solution of dodecyltriethoxysilane (PFDTES) was treated.
进一步地,周向吸液芯4设置于冷凝端主体1的外周与中心吸液芯2之间的二等分位置。具体来说,在本实施例中,冷凝端主体1为圆形,周向吸液芯4绕冷凝中心圆周等角度均匀分布,且设置在距中心二分之一半径处。Further, the circumferential liquid-
进一步地,中心吸液芯2与周向吸液芯4具体均为金属丝网烧结成型的多孔结构或泡沫金属烧结成型的多孔结构。Further, the central liquid-
需要说明的是,吸液芯是多孔结构,空隙远小于槽道,因此毛细力比槽道大,会吸收周围的液体储存起来,并直接传递给蒸发端,快速补充蒸发掉的液体工质。It should be noted that the wick is a porous structure, and the gap is much smaller than the channel, so the capillary force is larger than that of the channel, which will absorb the surrounding liquid and store it, and transfer it directly to the evaporation end to quickly replenish the evaporated liquid working medium.
具体来说,中心吸液芯2与周向吸液芯4利用毛细作用的结构,借助毛细作用也即毛细作用力实现吸液,促进槽道液体工质的流动,所吸液体工质流向蒸发端,促进均热板内工质构成循环回路,实现相变工质的相变与传热。吸液芯结构为铜金属丝网烧结成型的多孔结构,也即吸液芯为铜丝网制成。Specifically, the central liquid-absorbing
本实施例中,冷凝端主体1上预留有供中心吸液芯与轴向吸液芯烧结用的凹槽;周向吸液芯4支撑柱结构直径为4mm,吸液芯结构的厚度为1mm,烧结于冷凝端主体1表面预留的凹槽上。冷凝端主体边缘厚度为0.3-0.4mm。铜吸液芯结构烧结温度为900℃。In this embodiment, a groove for sintering the central liquid-absorbing core and the axial liquid-absorbing core is reserved on the
进一步的,一级叶脉槽道31远心端宽度为0.8-1.0mm,近心端宽度为0.1-0.3mm;二级叶脉槽道32宽度最大为0.8mm,最小为0.2-0.3mm,槽道深度为0.2-0.6mm。Further, the width of the distal end of the
进一步地,冷凝端主体1的第一端面凸起设置,且厚度沿冷凝中心往外周逐渐减小。Further, the first end face of the condensation end
具体来说,实际使用中,冷凝端主体1可以是采用将第一端面朝下的安装方式;第一端面凸起,使得液态工质在仿生叶脉槽道3内流动过程中,可以在重力作用下由厚度薄的位置流向厚度大的冷凝中心,使得液态工质由二级叶脉槽道32流向一级叶脉槽道31,由一级叶脉槽道31汇聚流向中心吸液芯2。Specifically, in actual use, the condensing end
本申请实施例提供一种超薄的仿生叶脉梯度吸液芯结构的均热板冷凝端,采用仿叶脉梯度吸液芯结构,包括具有仿生叶脉槽道3的均热板本体1以及吸液芯,仿生叶脉槽道3汇聚至中心吸液芯以供冷凝工质回流;吸液芯分布在冷凝中心以及四周,中心吸液芯2作为吸液中心,用于将均热板冷凝工质输向蒸发端,周向吸液芯4作为辅助吸液中枢以及均热板本体1的支撑点。气体工质在冷凝端主体表面冷凝为液态,在重力作用下由厚度薄的流向厚度大的部分,同时由于槽道疏水性梯度与槽宽渐缩的作用,渐缩的疏水性槽道利用叶脉尖端不断增大的毛细力,使得宽槽道处的液态工质自发流向窄槽道,即工质通过间隔槽道的远中心端流向近中心端,通过二级叶脉槽道32流向一级叶脉槽道31,进而汇聚至中心吸液芯2。由于周向吸液芯4与中心吸液芯均为多孔结构;周向吸液芯4作为吸液中枢能吸收周围槽道吸收的工质,空隙远小于槽道,因此毛细力比槽道大,会吸收周围的液体储存起来,并直接传递给蒸发端,快速补充蒸发掉的液体工质,同时还起到支撑冷凝端和蒸发端的作用。吸液芯汇聚的液态工质输送给均热板的蒸发端。因此加快了工质回流速率,改善平板热管的冷凝回流性能,有利于传热工质的循环,提高了传热效率,使温度更快达到平衡,均温性更好。The embodiment of the present application provides an ultra-thin cooling end of a soaking plate with a bionic leaf vein gradient liquid absorbing core structure, which adopts a leaf vein gradient liquid absorbing core structure, and includes a soaking
以上为本申请的优选实施例而已,并不用于限制本发明,尽管参照实例对本申请进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述实例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换,但是凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。The above are only preferred embodiments of the application, and are not intended to limit the present invention. Although the application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples. , or equivalently replace some of its technical features, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.
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