WO2023160109A1

WO2023160109A1 - Heat dissipation device and electronic apparatus

Info

Publication number: WO2023160109A1
Application number: PCT/CN2022/136558
Authority: WO
Inventors: 骆洋; 刘用鹿; 陈丘; 靳林芳
Original assignee: 华为技术有限公司
Priority date: 2022-02-23
Filing date: 2022-12-05
Publication date: 2023-08-31
Also published as: CN114727546B; CN114727546A

Abstract

Provided in the embodiments of the present application are a heat dissipation device and an electronic apparatus. The heat dissipation device comprises a housing and a fluid working medium, wherein the housing internally comprises evaporation areas and condensation areas, the evaporation areas being arranged at heating devices, so that the fluid working medium in the evaporation areas forms a vapor and flows toward the condensation areas; and wick structures, which are arranged in the housing, form vapor flow channels in the housing, and comprise first flow guide wicks, second flow guide wicks and backflow wicks, wherein the first flow guide wicks are located in the evaporation areas; first ends of the second flow guide wicks are suspended and located in the condensation areas or extend to the evaporation areas, and second ends of the second flow guide wicks are located in the condensation areas; the backflow wicks are connected to the second ends of the second flow guide wicks and the first flow guide wicks; and along the vapor flow channels, the first ends of the second flow guide wicks are closer to the evaporation areas than the second ends of the second flow guide wicks. According to the present application, the vapor and a liquid flow in the same direction, so that the situation where the liquid is retained in a condensation area due to the reversely flowing vapor carrying the liquid is avoided, thereby being beneficial for liquid returning to an evaporation area, preventing boiling dry and improving the reliability.

Description

A cooling device and electronic equipment

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China on February 23, 2022, with the application number 202210170970.0 and the application title "A heat dissipation device and electronic equipment", the entire contents of which are incorporated herein by reference Applying.

technical field

The present application relates to the technical field of terminals, in particular to a heat dissipation device and electronic equipment.

Background technique

In terminal equipment such as mobile phones, tablets, notebooks, PCs, large screens, etc., the heating power of electronic devices gradually increases with product iterations, but the overall size and thickness of the equipment are developing in a compact and small direction, resulting in heat accumulation in the equipment The interior cannot be dissipated in time, causing the temperature to rise, which not only affects the user experience, but may also cause high temperature damage to the device. Therefore, the industry urgently needs various efficient heat dissipation solutions to solve the heat dissipation problem of terminal equipment.

The vapor chamber (VC) is a vacuum chamber with a micro-nano liquid-absorbing core structure inside and injected with a fluid working medium, and is widely used in electronic products for heat dissipation. Specifically, the fluid working medium in the vapor chamber can absorb heat at a small-area heat source to form steam, which can be quickly transmitted to a large-area heat dissipation surface to achieve efficient heat dissipation. After the steam is condensed into a liquid, the liquid-absorbing core structure can be used The capillary force returns to the heat source, and evaporates and absorbs heat again.

In the existing vapor chamber, the steam flow direction is opposite to the liquid flow direction in the liquid-absorbing core structure, and the steam flowing in the opposite direction may carry condensed liquid droplets, so that the condensed liquid droplets stay in the condensation area, which is not conducive to the return of liquid to the evaporation area For rehydration, it is prone to dry out and cannot form a reliable heat transfer cycle.

Contents of the invention

The embodiment of the present application provides a heat dissipation device and electronic equipment to realize the flow of steam and liquid in the same direction, avoiding the reverse flow of steam carrying the liquid and causing the liquid to stay in the condensation area, which helps the liquid return to the evaporation area and prevents dry-out , Improve product reliability.

For this reason, the embodiment of the application adopts following technical scheme:

In the first aspect, the embodiment of the present application provides a heat dissipation device, the heat dissipation device includes: a housing and a fluid working medium accommodated in the housing, and the inner space of the housing includes at least one A set of evaporation area and condensation area, the first direction is perpendicular to the thickness direction of the shell, the evaporation area is used to be arranged at the heat generating device, so that the fluid working medium in the evaporation area forms steam and flows toward the The condensation area flows; the liquid-absorbing core structure is arranged in the housing and forms a steam flow channel in the housing, and the liquid-absorbing core structure includes a first flow-guiding liquid-absorbing core, a second flow-guiding liquid-absorbing core and At least one return liquid-absorbing core, the first flow-guiding liquid-absorbing core is located in the evaporation area, the first end of the second flow-guiding liquid-absorbing core is suspended, and the second The first end of the return wick is connected to the first diversion wick, and the second end of the return wick is connected to the second end of the second wick. The second end is connected; wherein, the steam flow channel includes a first portion adjacent to the second flow-guiding wick, and the first end of the second flow-guiding wick is connected to the second flow-guiding wick The direction in which the second end of the liquid wick extends is consistent with the direction in which the first part of the steam flow channel extends, and along the direction in which the steam flow channel extends, the first end of the second flow-guiding liquid-absorbing wick is opposite to the first part. The second ends of the two flow-guiding liquid-absorbing wicks are close to the evaporation area.

In the heat dissipation device of the embodiment of the present application, the first end of the second flow-guiding liquid-absorbing core first contacts the steam, so that the flow direction of a part of the steam in the space of the condensation zone is from the first end of the second flow-guiding liquid-absorbing core. end to the second end of the second flow-guiding liquid-absorbent core, another part of the steam in the steam condenses into liquid in the condensation zone, and passes through the first end of the second flow-guiding liquid-absorbing core, the second end of the second flow-guiding liquid-absorbing core The second end, the second end of the backflow wick and the first end of the backflow wick return to the evaporation area, so that the steam and the liquid flow in the same direction, and avoid the reverse flow of steam carrying the liquid and causing the liquid to stay in the condensation area, which helps From liquid return to evaporation area, it can effectively prevent dry-out and improve product reliability.

In a possible implementation manner, the first end of the second flow-guiding liquid-absorbing wick extends to the evaporation area, one end of the first part of the steam flow channel communicates with the evaporation area, and the first end of the steam flow channel The other end of a part extends to the second end of the return wick; or, the first end of the second flow-guiding wick is located in the condensation area, and the steam flow channel also includes a second part, so One end of the second part of the steam flow channel communicates with the evaporation area, and the other end of the second part of the steam flow channel communicates with one end of the first part of the steam flow channel and the second guide liquid wick The first end, the other end of the first portion of the vapor flow channel extends to the second end of the return wick. That is to say, in this implementation, the first end of the second flow-guiding liquid-absorbent core extends to the evaporation area, and the steam flow channel may only include the first part; the first end of the second flow-guiding liquid-absorbent core is located in the condensation area, The steam flow channel may include a first portion and a second portion.

In a possible implementation manner, the first part of the steam flow channel includes a first space between the return wick and the second diversion wick, and a space between the housing and the first wick. At least one of the second spacing spaces between the two flow-guiding wicks; and/or, the second portion of the vapor flow path includes a space between the first flow-guiding wick and the housing At least one of a first spaced area and a second spaced area at the vapor facing side of the return wick.

In a possible implementation manner, the second flow-guiding liquid-absorbent core includes a plurality of sub-liquid-absorbent cores arranged at intervals, and the respective second ends of the plurality of sub-liquid-absorbent cores are connected to the return liquid-absorbent core, so The respective first ends of the plurality of sub-liquid-absorbent cores are suspended, and the first part of the steam flow channel includes a third space between adjacent sub-liquid-absorbent cores. That is to say, in this implementation mode, one solution of the second flow-guiding liquid-absorbent core is to include a plurality of sub-absorbent cores arranged at intervals, and the plurality of sub-absorbent cores can be arranged side by side, or extend in different directions .

In a possible implementation manner, both sides of each sub-liquid-absorbent core along the thickness direction are respectively in contact with the side wall of the housing; or, one side of each of the sub-liquid-absorbent cores along the thickness direction In contact with the side wall of the housing, the other side of each sub-wick along the thickness direction is spaced apart from the side wall of the housing to form a second space for the steam flow channel . That is to say, in this implementation mode, multiple sub-liquid-absorbent cores can adopt a parallel structure, that is, both sides of each sub-liquid-absorbent core along the thickness direction are respectively in contact with the side wall of the housing; or, multiple sub-liquid-absorbent cores can also be A serial structure is adopted, that is, one side of each sub-liquid-absorbing core in the thickness direction is in contact with the side wall of the housing, and the other side is spaced apart from the side wall of the housing.

In a possible implementation manner, the second flow-guiding liquid-absorbent core is a plate-shaped structure, one side of the second flow-guiding liquid-absorbent core is in contact with the side wall of the casing along the thickness direction, and the second The other side of the flow-guiding liquid-absorbent core along the thickness direction is spaced apart from the side wall of the housing to form a second space between the steam flow channels. That is to say, in this implementation manner, another solution of the second flow-guiding liquid-absorbent core is to adopt a plate-like structure. Since the plate structure generally occupies a large space in the condensation area, in order to ensure that the steam can flow to the end of the condensation area away from the evaporation area, so as to condense into liquid as soon as possible, the second flow guide liquid suction core can choose a serial structure, that is The other side of the second flow-guiding liquid-absorbent core along the thickness direction is spaced apart from the side wall of the casing, so that a space for steam flow can be reserved.

In a possible implementation manner, the liquid-absorbing core structure further includes: a third flow-guiding liquid-absorbing core, located in the condensation area, and connected to the second end of the second flow-guiding liquid-absorbing core and the The return-flow absorbent core is connected, and the third flow-guiding liquid-absorbing core is used to guide the liquid in the second flow-guiding liquid-absorbing core into the return-flow liquid-absorbing core. That is to say, in this implementation, in order to facilitate the connection of the second flow-guiding wick and the return wick, a third flow-guiding wick can be arranged between the second flow-guiding wick and the return wick The third flow-guiding liquid-absorbent core can play the role of converging the liquid in the second flow-guiding liquid-absorbent core, so as to guide the liquid in the second flow-guiding liquid-absorbent core into the return flow absorbent core.

In a possible implementation manner, in a group of evaporating regions and condensing regions arranged along the first direction, the third flow-guiding wick extends along a second direction, and the second direction is perpendicular to the The thickness direction of the shell is set at an angle to the first direction, the second guide liquid-absorbent core extends from the third guide liquid-absorbent core toward the evaporation area, the second guide liquid-absorbent core The first end of the flow wick is closer to the evaporation zone than the second end of the second flow wick. That is to say, in this implementation, the extension direction of the third flow-guiding liquid-absorbing core can be selected in cooperation with the extending direction of the second flow-guiding liquid-absorbing core, and the third flow-guiding liquid-absorbing core is along the second direction such as the housing The second flow-guiding liquid wick can extend along the first direction, such as the length direction of the shell. Compared with the design of the parallel structure of the liquid wick in which the gas and liquid flow in the opposite direction, the gas flow path of the steam channel can be changed. Short, the flow resistance is reduced, and the temperature uniformity performance is better.

In a possible implementation manner, the at least one return absorbent core includes one or more than two first return absorbent cores, and the first return absorbent core is located in the housing along the second direction. The middle part, the two sides of the first return absorbent core are respectively provided with the second diversion absorbent core; the second end of the first return absorbent core and the third diversion absorbent core The middle connection; and/or, the at least one return wick includes a second return wick, the second return wick is located on one side of the housing along the second direction, and the return wick The side of the side away from the housing is provided with the second flow-guiding liquid-absorbent core; the second end of the second return-flow liquid-absorbent core is connected to one end of the third flow-guiding liquid-absorbent core. That is to say, in this implementation manner, the number of the reflux liquid absorbent core may be one, or two, or more, which may be specifically selected according to the amount of liquid reflux. In addition, the return absorbent core may be located in the middle of the housing along the second direction, and at this time may be connected to the middle of the third diversion absorbent core; or, the return absorbent core may also be located in the middle of the housing along the second direction. One side can be connected with the end of the third flow-guiding liquid-absorbent core at this moment.

In a possible implementation manner, the at least one return liquid absorbent core includes a third return liquid absorbent core and a fourth return liquid absorbent core respectively located on both sides of the housing along the second direction; The second flow-guiding liquid-absorbent core is located between the third return-flow liquid-absorbent core and the fourth return-flow liquid-absorbent core; the first end of the second flow-guiding liquid-absorbent core is There is an interval space between the liquid cores along the first direction; the two ends of the first flow-guiding liquid-absorbing core along the second direction are respectively connected to the third return-flow absorbing core and the fourth return-flow absorbing core. The respective first ends of the liquid cores are connected; the two ends of the third flow-guiding liquid-absorbent core along the second direction are respectively connected to the respective second ends of the third return liquid-absorbent core and the fourth return liquid-absorbent core. end connection. That is to say, in this implementation, the number of return wicks can be two, and they are respectively located on both sides of the housing along the second direction, and the steam flows from the evaporation area to the condensation area between the two return wicks. area flow, and because the suspended first end of the second flow-guiding liquid-absorbent core contacts the steam first, the liquid after the steam condenses moves from the first end to the second end in the second flow-guiding liquid-absorbing core, and the flow of steam same direction.

In a possible implementation manner, the inner space of the housing includes a first evaporation zone and a first condensation zone arranged along a first direction, and a second evaporation zone and a second condensation zone arranged along the first direction , the first evaporating area and the second condensing area are arranged side by side and located at the first end of the housing along the first direction; the first condensing area and the second evaporating area are arranged side by side and located at the first end of the housing The second end of the housing along the first direction; the second flow-guiding liquid-absorbing wick in the first condensation area and the first flow-guiding liquid-absorbing wick in the second evaporation area and the first evaporation area A space is provided between the first flow-guiding wick and the first flow-wicking wick in the second condensation zone; the at least one return wick includes a fifth return wick and a sixth return wick wick, the fifth return wick is located on the first side of the housing along the second direction, and the sixth return wick is located on the second side of the housing along the second direction. side, the fifth return wick is connected to the first flow guide wick in the first evaporation zone and the third flow guide wick in the first condensation zone, and the sixth return wick is connected to the The first flow-guiding liquid-absorbing wick in the second evaporation zone and the third flow-guiding liquid-absorbing wick in the second condensation zone. That is to say, in this implementation, the inner space of the housing can be provided with a first set of evaporation zones and condensation zones, that is, a first evaporation zone and a first condensation zone, and a second set of evaporation zones and condensation zones, that is, For the second evaporation area and the second condensation area, the first evaporation area can correspond to the first heat generating device, and the second evaporation area can correspond to the second heat generating device, which is applicable to the scene of multiple heat generating devices.

In a possible implementation manner, in the first condensation area, the length of the second flow-guiding liquid-absorbing wick decreases along the direction from the first evaporation area to the second evaporation area; In the second condensation area, the length of the second flow-guiding liquid-absorbing wick increases along the direction from the first evaporation area to the second evaporation area. That is to say, in this implementation mode, the first end of the second flow-guiding liquid-absorbing wick in the first condensation area forms an inclined structure, and the first end of the second flow-guiding liquid-absorbing wick in the second condensation area forms an inclined structure, The two inclined structures can be arranged in parallel and at intervals to form an interval space.

In a possible implementation manner, the at least one return wick includes more than two return wicks located in the middle of the housing along a second direction, the second direction being perpendicular to the Thickness direction, and set at an angle to the first direction, the second end of each of the return wicks is provided with the third diversion wick, and the second end of the reflux wick is different from the second end of the wick. The third flow-guiding liquid-absorbent cores are arranged at intervals, the width of the third flow-guiding liquid-absorbing cores is larger than the width of the return flow-absorbing cores, and each third flow-guiding liquid-absorbing cores are connected to at least part of the second flow-guiding liquid-absorbing cores. liquid core. That is to say, in this implementation mode, a plurality of return wicks can be arranged in the middle of the housing along the second direction, and a third flow-guiding wick can be arranged at the second end of the return wick, and different return wicks can be provided. The third flow-guiding liquid-absorbent core at the second end of the liquid-absorbent core can be arranged at intervals, so as to connect the second flow-guiding liquid-absorbent core at different positions, so that the liquid in the second flow-guiding liquid-absorbent core at different positions can be Respectively through the connected third diversion wick into the corresponding return wick.

In a possible implementation manner, the condensation area extends outward along a direction from being close to the evaporation area to being away from the evaporation area, and the return wick extends along the first direction and is located in the evaporation area One side along the second direction, the second direction is perpendicular to the thickness direction of the shell, and is set at an angle to the first direction, one end of the third flow-guiding liquid-absorbing core is connected to the return flow The second end of the liquid-absorbing core is connected to the part close to the evaporation area, the other end of the third guide liquid-absorbing core extends in a direction away from the evaporation area and the return liquid-absorbing core, and the second guide The flow wick extends from the third flow-guiding wick in a direction away from the evaporation zone and bends toward the return wick, and the second end of the second flow-guiding wick is opposite to the first The first ends of the two flow-guiding wicks are close to the evaporation area. That is to say, in this implementation, if the width of the condensation zone is larger than that of the evaporation zone, the shape of the third flow-guiding wick can be deformed according to the shape of the condensation zone, for example, the return wick extends along the first direction, and the second The three diversion wicks extend in a direction away from the evaporation zone and the return wick, at this time the shape of the second diversion wick can also be deformed according to the shape of the condensation zone, such as the shape of the second diversion wick Can be curved.

In a possible implementation manner, the first flow-guiding liquid-absorbent core includes a plate-shaped main body, and one side of the first flow-guiding liquid-absorbent core along the thickness direction is in contact with the side wall of the housing The other side of the first flow-guiding liquid-absorbing core along the thickness direction is spaced apart from the side wall of the housing. That is to say, in this implementation mode, one solution of the first flow-guiding liquid-absorbing core is to include a plate-shaped body. Since the area of the plate-shaped body is generally large, the first flow-guiding liquid-absorbing core can adopt a serial structure, That is, one side of the first flow-guiding liquid-absorbing wick in the thickness direction is in contact with the side wall of the housing, and the other side is spaced apart from the side wall of the housing, so as to form a space for the steam in the evaporation area to flow.

In a possible implementation manner, the first flow-guiding liquid-absorbent core further includes a plurality of branch parts arranged at intervals, and the two sides of each branch part along the thickness direction are respectively connected to the plate-shaped main body and the The side walls of the housing are connected, and the return wick is connected to at least one of the plate-shaped main body and the plurality of branch parts. That is to say, in this implementation mode, the first flow-guiding liquid-absorbing core includes a plate-shaped main body and a plurality of branch parts, and a combination of serial and parallel solutions can be adopted, which can increase the capacity of the first flow-guiding liquid-absorbing core. The area is conducive to making the liquid inside absorb heat as soon as possible to form steam.

In a possible implementation manner, the first flow-guiding liquid-absorbing core includes a rod-shaped flow-guiding part, and the end of the rod-shaped flow-guiding part close to the condensation zone along the first direction is connected to the back flow The first end of the wick is connected. That is to say, in this implementation manner, another solution of the first flow-guiding liquid-absorbent core is to include a rod-shaped flow-guiding part. Moreover, the shape of the rod-shaped air guide can be flexibly selected according to the extension direction of the return wick and the spatial shape of the evaporation area, such as linear, L-shaped or U-shaped.

In a possible implementation manner, both sides of the rod-shaped air guide part along the thickness direction are respectively in contact with the side walls of the housing; or, the rod-shaped air guide part along the thickness direction One side is in contact with the side wall of the housing, and the other side of the rod-shaped air guide along the thickness direction is spaced apart from the side wall of the housing. That is to say, in this implementation manner, the rod-shaped air guides may be of a parallel structure or a serial structure.

In a possible implementation manner, the first flow-guiding liquid-absorbing core further includes a plurality of branch flow-guiding parts arranged side by side and at intervals, and each branch flow-guiding part extends in a direction away from the rod-shaped flow-guiding part , wherein: the rod-shaped guide part is linear and extends along the first direction, and the plurality of branch guide parts are arranged on the side of the rod-shaped guide part facing the steam along the extending direction; Or, the rod-shaped guide part is L-shaped, the first side of the L-shaped is connected to the return absorbent core, and the plurality of branch guide parts are arranged on the first side of the L-shaped or on the second side and towards the inside of the L-shape. That is to say, in this implementation, another solution of the first flow-guiding liquid-absorbing core is to include a rod-shaped flow-guiding part and a plurality of branch-shaped flow-guiding parts, and the branch-shaped flow-guiding parts can and positions are set on one side or both sides of the rod-shaped flow guide.

In a possible implementation manner, both sides of each of the branch air guides along the thickness direction are in contact with the side walls of the housing respectively; or, each of the branch air guides along the thickness direction One side in the thickness direction is in contact with the side wall of the housing, and the other side of each branch guide part in the thickness direction is spaced apart from the side wall of the housing. That is to say, in this implementation manner, the branch diverter can be a parallel structure or a serial structure.

In a possible implementation manner, the housing is provided with an air suction port, and the air suction port corresponds to one of the evaporation area and the condensation area, wherein: the air extraction port is connected to the evaporation area and the condensation area One of the condensation areas is directly connected; or, the structure of the liquid-absorbing wick at one of the evaporation area and the condensation area is provided with a through opening, and the air suction port is connected to the through opening through the through opening. The evaporation zone communicates with one of the condensation zones. That is to say, in this implementation manner, the heat dissipation device is a vacuum cavity, and an air extraction port may be provided on the housing to extract air from the evaporation area and the condensation area. Moreover, if the liquid-absorbing core structure forms a closed structure in the housing, and the closed structure adopts a parallel structure, at this time, a through opening can be provided on the closed structure so as to communicate with the air suction port on the housing, thereby realizing the evaporation through the air suction port. area and condensation area for extraction. It can be understood that if the closed structure adopts a serial structure, no through openings can be provided at this time, and the air suction port on the casing can directly communicate with one of the evaporation area and the condensation area.

In a possible implementation manner, both sides of the return wick along the thickness direction are respectively in contact with the side walls of the housing; or, the return wick along the thickness direction One side is in contact with the side wall of the housing, and the other side of the backflow absorbent core along the thickness direction is spaced apart from the side wall of the housing. That is to say, in this implementation manner, the backflow wicks can be of a parallel architecture or a serial architecture.

In a possible implementation manner, the heat dissipation device further includes a spacer, the spacer is arranged on the side of each return wick facing the steam, and the spacer is located along both sides of the thickness direction. are in contact with the side walls of the housing respectively; wherein: the return suction core is located in the middle of the housing, and the two sides of the return suction core are respectively provided with the spacers; or, the return suction The liquid core is located on one side of the casing, and the side of the backflow liquid-absorbing core away from the casing is provided with the spacer. That is to say, in this implementation, since the flow direction of the liquid in the backflow wick is opposite to the flow direction of the steam in the inner space/cavity of the housing, in order to avoid the reverse flow of steam carrying the liquid in the backflow wick The liquid stays in the condensing area, which is not conducive to returning the liquid to the evaporation area for replenishment. A spacer can be set on the side of the return wick facing the steam.

In a possible implementation manner, the spacer is integrally formed or separately formed with the side wall of the housing on one side along the thickness direction; and/or, the spacer is integrally structured or The spacer includes a plurality of segments arranged at intervals along the extending direction of the return wick. That is to say, in this implementation, in order to simplify the installation procedure, the spacer is integrally formed with the side wall of the shell on one side along the thickness direction, such as the upper cover or the lower cover of the shell, and the spacer can be Integral structure; in order to reduce the difficulty of installation, the spacer can be formed separately from the housing, and the spacer can include multiple segments.

In a possible implementation manner, the structure of the liquid-absorbing core adopts a capillary structure; the formation of the capillary structure includes at least one of the following: weaving, sintering, etching and electroplating. That is to say, in this implementation manner, the material of the capillary structure may include at least one of braided material, sintered material, etching material and electroplating material; in addition, the specific structure of the capillary structure may include multiple groove structures and multiple A protruding structure, a plurality of groove structures and a plurality of protruding structures can be formed by etching, for example.

In the second aspect, the embodiment of the present application provides an electronic device, which includes: the heat sink provided in the first aspect above; a heat generating device, which is arranged corresponding to the evaporation area of the heat sink in contact with the housing of the heat sink .

Other features and advantages of the present invention will be described in detail in the following specific examples.

Description of drawings

The following briefly introduces the drawings used in the embodiments or the description of the prior art.

Fig. 1A is a structural schematic diagram of a vapor chamber with a liquid-absorbing core structure adopting a serial structure;

Fig. 1B is a schematic diagram of an exemplary specific structure of the vapor chamber shown in Fig. 1A;

Fig. 2A is a structural schematic diagram of a vapor chamber with a liquid-absorbing core structure adopting a parallel structure;

Fig. 2B is a schematic diagram of an exemplary specific structure of the vapor chamber shown in Fig. 2A;

FIG. 3A is a schematic top view of the heat sink provided by the first embodiment of the present application after the upper cover is removed;

3B is a schematic cross-sectional structural view of the heat sink shown in FIG. 3A at the line A-A;

FIG. 4A is a schematic top view of the heat sink provided by the second embodiment of the present application after the upper cover is removed;

FIG. 4B is a schematic cross-sectional structural view of the heat sink shown in FIG. 4A at the A-A line, the B-B line and the C-C line;

FIG. 5A is a schematic top view of a modification of the heat sink shown in FIG. 4A;

FIG. 5B is a schematic cross-sectional structural view of the heat sink shown in FIG. 5A at the lines A-A and B-B;

FIG. 6A is a top structural schematic diagram of a modification of the heat dissipation device shown in FIG. 5A;

FIG. 6B is a schematic cross-sectional structural view of the heat sink shown in FIG. 6A at line A-A;

Fig. 7 is a top structural schematic diagram of a modification of the heat dissipation device shown in Fig. 6A;

FIG. 8A is a schematic top view of the heat sink provided by the third embodiment of the present application after the upper cover is removed;

FIG. 8B is a schematic cross-sectional structural view of the heat sink shown in FIG. 8A at the lines A-A, B-B and C-C;

FIG. 9A is a schematic top view of the heat sink provided by the fourth embodiment of the present application after the upper cover is removed;

FIG. 9B is a schematic cross-sectional structural view of the heat sink shown in FIG. 9A at the lines A-A and B-B;

FIG. 10 is a schematic top view of the heat sink provided by the fifth embodiment of the present application after the upper cover is removed;

FIG. 11 is a schematic top view of the heat sink provided by the sixth embodiment of the present application after the upper cover is removed;

FIG. 12 is a top structural schematic diagram of a heat sink with the upper cover plate removed.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the description of this application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", " The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or Elements must have certain orientations, be constructed and operate in certain orientations, and thus should not be construed as limiting the application.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , can also be a conflicting connection or an integral connection; it can be a direct connection or an indirect connection, and the indirect connection of two components can mean that the two components are connected through a third component; for those of ordinary skill in the art , the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

The vapor chamber quickly conducts heat from a small-area heat source to a large-area heat dissipation surface, thereby achieving the purpose of efficient heat dissipation. Its working mechanism is to take advantage of the characteristics of fluid working medium boiling heat absorption and condensation heat release, so as to realize the effect of quickly transporting heat from the hot end to the cold end through steam flow.

Vapor chamber mainly includes shell, liquid-absorbing core such as capillary structure and fluid working fluid, etc. The liquid in the liquid-absorbing core absorbs heat, evaporates and boils to generate steam into the cavity; the gas flows in the cavity to the condensation area with a lower temperature to release heat, condenses into liquid droplets, and the liquid is reabsorbed by the liquid-absorbing core and evaporates in the capillary Under the action of force, it flows to the evaporation area. That is to say, the evaporation area is the area where heat sinks such as vapor chambers are attached to the heat source. The evaporation area absorbs the heat from the heat source, causing the internal liquid working fluid to evaporate into gas and enter the cavity channel. The condensation area is the large heat dissipation area of the heat dissipation device such as a vapor chamber. The gas in the cavity in the condensation area condenses and releases heat, and the condensed liquid is absorbed by the liquid-absorbing core structure such as a capillary structure.

Wherein, the shell may include an upper cover and a lower cover. According to whether the structure of the liquid-absorbing core in the vapor chamber directly abuts against the respective inner surfaces of the upper cover and the lower cover, the structure of the liquid-absorbing core can be divided into a serial structure and a parallel structure.

FIG. 1A is a structural schematic diagram of a vapor chamber with a liquid-absorbing core structure adopting a serial structure. As shown in Figure 1A, in the serial structure, the liquid-absorbing core, namely the capillary, is not attached to the respective inner surfaces of the upper cover and the lower cover at the same time, and there is still a cavity through which steam passes between the capillary and the cover.

FIG. 1B is a schematic diagram of an exemplary specific structure of the temperature chamber shown in FIG. 1A . As shown in Figure 1B, the fluid working medium (not shown in the figure) at the hot end absorbs heat, forms a gas, and moves in the upper cavity toward the cold end, where the gas condenses and releases heat to form a liquid that enters the capillary , and move toward the hot end under the action of capillary force, so as to absorb heat again by evaporation. It can be seen that the gas flow direction in the cavity is from the hot end to the cold end; the liquid flow direction in the capillary is from the cold end to the hot end, that is, the flow direction of gas and liquid is opposite.

FIG. 2A is a schematic structural view of a vapor chamber with a liquid-absorbing core structure that adopts a parallel structure. As shown in Figure 2A, in a parallel structure, multiple liquid-absorbing cores, namely capillaries, can be included, which are directly supported by the inner surfaces of the upper cover and the lower cover, and the liquid and gas in the capillary can only enter and exit through the side. . At this time, the capillary can play the role of supporting the upper cover and the lower cover.

Fig. 2B is a schematic diagram of an exemplary specific structure of the temperature chamber shown in Fig. 2A. In FIG. 2B , the left side view is a top view of the vapor chamber after removing the top cover; the right side view is a cross-sectional view of the left side view at lines A-A and B-B. As shown in Figure 2B, one end of the plurality of capillaries arranged at intervals is located at the hot end and connected together, and the other end is located at the cold end. architecture. The fluid working medium (not shown in the figure) at the hot end absorbs heat and moves toward the cold end in the space between adjacent capillaries. After the cold end is condensed into a liquid, it enters the other end of the capillary and undergoes capillary force. Moves towards the hot end under action.

Due to the structure of the liquid-absorbing core, that is, the two sides of the capillary abut against the inner surfaces of the upper cover and the lower cover respectively, the fluid working medium in the capillary can only evaporate from the side of the capillary, resulting in a small evaporation area. When the power consumption increases, the thermal resistance of evaporation and the pressure drop of vapor circulation are large, resulting in poor temperature uniformity performance of the vapor chamber. Moreover, the flow direction of the liquid in the capillary (refer to the cross-sectional view A-A) is opposite to the flow direction of the vapor/gas in the space between adjacent capillaries (refer to the cross-sectional view B-B).

With the development of ultra-thin terminal electronic equipment, the thickness of the chamber design is getting smaller and smaller. The conventional serial wick structure design will compress the thickness of the wick and the vapor cavity at the same time when reducing the thickness, so that the gas and liquid flow resistance of the vapor chamber will be significantly increased. Although the parallel structure produces a larger space for the thickness of the liquid wick and the steam cavity compared with the serial structure, the smaller cross-sectional area of the liquid wick structure results in less liquid return and a larger steam cavity channel The width makes it difficult for steam or condensed liquid to contact the wick, which in turn is not conducive to the liquid return of the wick, resulting in easy dry-out. In addition, the large pressure difference in the steam chamber will also lead to an increase in the theoretical maximum temperature difference of the vapor chamber. Specifically, the pressure drop of the steam flow in the steam chamber is proportional to the length of the channel and inversely proportional to the cross-sectional area of the channel. The conventional design of liquid wicks with parallel structure tends to cause the length of the steam chamber channel to be too long and the pressure drop to be too high, which will increase the saturation temperature difference of the steam and reduce the uniform temperature performance of the vapor chamber.

In addition, in the conventional serial and parallel wick structure design, the steam in the internal cavity is in contact with the liquid in the wick, and the gas flow direction in the cavity is opposite to the liquid backflow direction in the wick structure, and the reverse flow may cause Carrying liquid droplets, that is, the high-speed flowing gas will carry the liquid on the surface of the liquid-absorbing core structure, causing the condensed droplets to stay in the condensation area, which is not conducive to returning the liquid to the evaporation area for rehydration, which will easily lead to the untimely liquid return in the evaporation area, thus Burnout occurs, rendering the vapor chamber ineffective. Therefore, it is necessary to design a special liquid-absorbing core and steam cavity channel structure to promote the phase change transport of gas and liquid and form a reliable heat and mass transfer cycle.

In view of this, embodiments of the present application provide a heat dissipation device and electronic equipment. Among them, electronic equipment includes heating devices and cooling devices. The heating element is arranged in contact with the shell of the heat sink corresponding to the evaporation area of the heat sink. Wherein, in the embodiment of the present application, "contact" may be direct contact or indirect contact. For example, other components such as an adhesive layer may be provided between the heat generating device and the housing of the heat sink to achieve indirect contact.

In addition, the heat generating device can be a chip, a battery or a battery circuit board. The heat dissipation device can be passive heat dissipation devices such as heat pipes and vapor chambers, and can be applied to terminal electronic equipment such as mobile phones. The main application scenario is to efficiently dissipate heat from high-temperature components.

The heat dissipation device in the embodiment of the present application solves the problem of liquid droplet carrying caused by the reverse flow of gas and liquid in the vapor chamber, improves the structure of the internal liquid-absorbing core and the layout of the cavity, and can realize the flow of steam and liquid in the same direction and avoid reverse flow The steam carries the liquid, so that the liquid stays in the condensation area, which helps to return the liquid to the evaporation area, improves the reliability of the capillary liquid return, and effectively prevents dry-out.

FIG. 3A is a schematic top view of the heat sink provided by the first embodiment of the present application after removing the upper cover plate. FIG. 3B is a schematic cross-sectional structural diagram of the heat dissipation device shown in FIG. 3A at line A-A. As shown in FIG. 3A and FIG. 3B , the heat dissipation device includes a housing 1 , a fluid working medium (not shown in the figure) contained in the housing 1 and a liquid-absorbing core structure 2 . The housing 1 may include an upper cover 11 , a lower cover 12 and an annular support structure 13 between the upper cover 11 and the lower cover 12 . The annular support structure 13 can be integrally formed with one of the upper cover plate 11 and the lower cover plate 12 , or the annular support structure 13 can be separately formed with the upper cover plate 11 and the lower cover plate 12 . The upper cover plate 11 , the lower cover plate 12 and the annular support structure 13 can form a closed inner space/cavity for the flow of gas and liquid.

Among them, the liquid-absorbing core structure can use a porous liquid-absorbing core structure. For the flow in the pores, the surface tension of the fluid occupies a dominant position. The capillary force generated by the liquid-absorbing core can absorb the liquid droplets formed by condensation in the cavity and drive the liquid in the air. Seepage inside the wick. The structure of the liquid-absorbing core can adopt a capillary structure; the formation of the capillary structure includes at least one of the following: weaving, sintering, etching and electroplating. That is, the material of the capillary structure may include at least one of braided material, sintered material, etched material and plated material. In addition, the specific structure of the capillary structure may include a plurality of groove structures and a plurality of protrusion structures, and the plurality of groove structures and the plurality of protrusion structures may be formed by etching, for example.

As shown in FIG. 3A , the inner space of the housing 1 includes at least one set of evaporation regions a and condensation regions b arranged along the first direction. The substance forms steam and flows towards the condensation zone b. The first direction is perpendicular to the thickness direction of the housing 1 , for example, the first direction may be the length direction or the width direction of the housing 1 . It can be understood that the first direction can also be other directions of the casing 1 except the length direction and the width direction. The following mainly takes the first direction as the length direction of the housing 1 as an example for description. Moreover, the evaporation zone a and the condensation zone b can be directly connected, or a transition zone can also be set between the evaporation zone a and the condensation zone b, and the transition zone can be the region between the evaporation zone a and the condensation zone b shown in FIG. 3A . The liquid-absorbing core structure 2 is arranged in the housing 1 and includes a first flow-guiding liquid-absorbing core 21 , a second flow-guiding liquid-absorbing core 22 and at least one return liquid-absorbing core 23 . The first flow-guiding liquid-absorbing core 21 is located in the evaporation area a, the first end D1 of the second flow-guiding liquid-absorbing core 22 is suspended and located in the condensation area b or extends to the evaporation area a, and the first end D1 of the second flow-guiding liquid-absorbing core 22 The two ends D2 are located in the condensation zone b, the first end of the return wick 23 is connected to the first flow wick 21, the second end of the reflux wick 23 is connected to the second end of the second wick 22 D2 connection.

It should be noted that the "suspension arrangement" here means that the first end D1 of the second flow-guiding liquid-absorbent core 22 is the cavity of the casing, and no other components are arranged. In other words, "suspension setting" refers to the first end D1 of the second flow-guiding liquid-absorbing core 22 and other components in the housing 1, such as the first flow-guiding liquid-absorbing core 21, the return liquid-absorbing core 23 and the spacer 3, etc. Arranged at intervals, there is an interval space between the first end D1 of the second flow-guiding liquid-absorbing core 22 and other components. In one example, the "suspension setting" can be that the end face of the first end D1 of the second flow-guiding liquid-absorbing core 22 is located in the cavity or communicated with the cavity; in another example, the "suspension setting" can be Both the end surface and the side surface of the first end D1 of the second flow-guiding liquid-absorbing core 22 are provided with cavities, or in other words, are in contact with the cavities.

In FIG. 3A , the inner space of the housing 1 includes a set of evaporation zones a and condensation zones b arranged along a first direction. The first flow-guiding liquid-absorbing core 21 includes a rod-shaped air-guiding portion 213 , and the end of the rod-shaped air-guiding portion 213 along the first direction close to the condensation zone b is connected to the first end of the return-flow liquid-absorbing core 23 . Moreover, in one example, the two sides of the rod-shaped air guide part 213 are respectively in contact with the side wall of the housing 1 along the thickness direction, that is, the rod-shaped air guide part 213 has a parallel structure; or, in another example, the rod-shaped air guide part One side of the flow guiding part 213 along the thickness direction is in contact with the side wall of the casing 1 , and the other side of the rod-shaped flow guiding part 213 along the thickness direction is spaced apart from the side wall of the casing 1 . Wherein, wherein, the side walls of the housing 1 that are in contact with both sides of the liquid-absorbing core structure 2 such as the rod-shaped flow guide 213 along the thickness direction refer to the inner surface of the upper cover plate 11 and the inner surface of the lower cover plate 12; The side wall of the body 1 that is in contact with one side of the liquid-absorbing core structure 2 such as the rod-shaped flow guide 213 along the thickness direction refers to the inner surface of the upper cover 11 or the inner surface of the lower cover 12 .

Moreover, the steam flow channel can have but not limited to the following two schemes:

Scheme 1—as shown in FIG. 3A , the first end D1 of the second flow-guiding liquid-absorbent core 22 is located in the condensation zone b, and the steam flow channel includes the second part P2 and the first end D1 adjacent to the second flow-guiding liquid-absorbent core 22 Part of P1. One end of the second part P2 of the steam flow channel communicates with the evaporation zone a, and the other end of the second part P2 of the steam flow channel communicates with one end of the first part P1 of the steam flow channel and the first end D1 of the second flow-guiding wick 22 , the other end of the first portion P1 of the vapor flow channel extends to the second end of the return wick 23 .

Solution 2—the first end D1 of the second flow-guiding liquid-absorbent wick 22 extends to the evaporation zone a, and the vapor flow channel includes a first part P1 adjacent to the second flow-guiding liquid-absorbent wick 22 . One end of the first part P1 of the steam flow channel communicates with the evaporation zone a, and the other end of the first part P1 of the steam flow channel extends to the second end of the return wick 23 .

That is to say, the suspended first end D1 of the second flow-guiding liquid-absorbing core 22 can be located in the condensation zone b, as shown in FIG. 22 adjacent to the first part of P1. And when necessary, the suspended first end of the second flow-guiding liquid-absorbing core 22 can also extend to the evaporation zone a. The first part of P1.

Continuing to refer to FIG. 3A , the second flow-guiding wick 22 may include a plurality of sub-wicks 221 arranged at intervals, the respective second ends of the plurality of sub-wicks 221 are connected to the return wick 23, and the plurality of sub-wicks 221 The respective first ends are suspended, and the first part P1 of the vapor flow channel includes a third space between adjacent sub-wicks 221 . Moreover, both sides of each sub-sucking core 221 along the thickness direction can respectively contact the side wall of the housing 1, that is, at this time, the second flow-guiding liquid-sucking core 22 is a parallel structure; One side of the direction is in contact with the side wall of the housing 1, and the other side of each sub-liquid-absorbent core 221 is spaced apart from the side wall of the housing 1 along the thickness direction to form a second space for the steam flow channel. The two flow-guiding liquid-absorbing cores 22 are in a serial structure.

In addition, the first portion P1 of the vapor flow path may include a first space between the return wick 23 and the second flow-guiding wick 22 and a second space between the housing 1 and the second flow-guiding wick 22 . at least one of the interspaces. As shown in FIG. 3A, in the area where a plurality of sub-sucking cores 221 are arranged, the innermost sub-sucking core 221 and the return-flowing liquid-sucking core 23 (or the spacer 3 to be introduced below) are spaced apart to form a first space; The outermost sub-liquid-absorbent core 221 is spaced apart from the annular support structure 13 of the housing 1 to form a second space.

Also, the second portion P2 of the vapor flow path may include a first spacer region between the first flow-guiding wick 21 and the housing 1 and a return wick 23 (not adjacent to the second flow-guiding wick 22 ). At least one of the second spacing regions at the steam-facing side of the position). As shown in FIG. 3A, the first guide liquid-absorbing core 21, such as the rod-shaped guide part 213, is spaced apart from the annular support structure 13 of the housing 1 to form a first interval area; it is located in the evaporation zone a and the first part P1 of the steam flow channel. In the region between them, the steam-facing side of the return wick 23 is spaced apart from the annular support structure 13 of the housing 1 to form a second separation region.

Further, the direction extending from the first end D1 of the second flow-guiding liquid-absorbent core 22 to the second end D2 of the second flow-guiding liquid-absorbent core 22 is consistent with the extending direction of the first part of the steam flow channel, and along the steam flow channel The first end D1 of the second flow-guiding liquid-absorbent wick 22 is closer to the evaporation zone a than the second end D2 of the second flow-guiding liquid-absorbent wick 22 in the extending direction. Here, "extending in the same direction" means that the extending direction of the second flow-guiding liquid-absorbing core 22 is basically the same as the extending direction of the first part P1 of the steam flow channel, and the second flow-guiding liquid-absorbing core 22 is roughly along the first part of the steam flow channel. The extension direction of P1 extends.

In this way, the extension direction of the second flow-guiding liquid-absorbing core 22 can be set to: make in the second flow-guiding liquid-absorbing core 22, along the extending direction of the second flow-guiding liquid-absorbing core 22, the The part of the first end D1 that is relatively far away from the first end D1 of the second flow-guiding liquid-absorbent core 22 contacts the steam first. That is to say, the extension direction of the second flow-guiding liquid-absorbent core 22 is set so that the flow direction of a part of the steam in the space of the condensation zone b is from the first end D1 of the second flow-guiding liquid-absorbent core 22 to the first end D1. The second end D2 of the second flow-guiding liquid-absorbing core 22, and another part of the steam in the steam is condensed into a liquid in the condensation zone b, and can pass through the first end D1 of the second flow-guiding liquid-absorbing core 22, the second flow-guiding The second end D2 of the liquid wick 22 , the second end of the return wick 23 and the first end of the return wick 23 return to the evaporation zone a.

Since the suspended first end of the second flow-guiding liquid-absorbing core 22 first contacts the steam, the liquid after steam condensation enters the suspended first end D1 of the second flow-guiding liquid-absorbing core 22 first, and then under the action of capillary force Move to the second end D2 of the second flow-guiding liquid-absorbent core 22, that is, the flow direction of the condensed liquid in the second flow-guiding liquid-absorbing core 22 is so that the suspended first end of the second flow-guiding liquid-absorbing core 22 D1 to the second end D2 of the second flow-guiding liquid-absorbent core 22, and the flow direction of steam (from the suspended first end D1 of the second flow-guiding liquid-absorbent core 22 to the second end D1 of the second flow-guiding liquid-absorbent core 22 D2) is the same, that is, the steam and the liquid flow in the same direction, which can avoid the reverse flow of the steam carrying the liquid, so that the liquid stays in the condensation zone b, which helps to return the liquid to the evaporation zone a, effectively prevents the dry-out situation, and improves the product quality. reliability.

Then, the liquid at the second end D2 of the second diversion liquid-absorbing core 22 enters the second end of the return-flow liquid-absorbent core 23, and continues to move to the first end of the return-flow liquid-absorbent core 23 under the action of capillary force, That is, the flow direction of the condensed liquid in the backflow liquid-absorbent core 23 is from the second end of the return-flow liquid-absorbent core 23 to the first end of the return-flow liquid-absorbent core 23, which is different from the flow direction of the steam (from the second flow-guided liquid-absorbent The suspended first end D1 of the core 22 is opposite to the second end D2 of the second flow-guiding liquid-absorbent core 22), and then, the liquid at the first end of the backflow liquid-absorbent core 23 enters the first flow-guiding liquid-absorbent core 21, The first flow-guiding liquid-absorbent wick 21 is located in the evaporation zone, where the liquid can be converted into vapor again for the next round of circulation.

Since the flow direction of the liquid in the return wick 23 (from the condensation area to the evaporation area) is opposite to the flow direction of the vapor in the inner space of the housing 1 (from the evaporation area to the condensation area), the reverse flow may carry liquid droplets, Make the condensate drop stay in the condensation area, which is not conducive to the return of the liquid to the evaporation area for replenishment. In order to isolate the steam from the liquid in the return wick 23 , the heat dissipation device may further include a spacer 3 , and the spacer 3 is arranged on the side of each return wick 23 facing the steam. In FIG. 3A , the backflow liquid-absorbing core 23 is located in the middle of the housing 1 , and spacers 3 are provided on both sides of the return-flow liquid-absorbent core 23 .

Wherein, both sides of the spacer 3 along the thickness direction are respectively in contact with the side walls of the casing 1 , so that the spacer 3 and the casing 1 can form a relatively closed space for accommodating the return wick 23 . The spacer 3 is used to isolate the gas flowing in the cavity from the liquid in the reflux wick 23, preventing the steam in the inner space of the housing 1 from carrying the liquid in the reflux wick 23, so that the condensed droplets stay in the condensation zone b , while the spacer 3 can play a role in supporting the shell 1, which helps to improve the structural strength.

Further, for the convenience of installation, the spacer 3 can be integrally formed with a side wall of the casing 1 along the thickness direction, such as the upper cover plate 11 or the lower cover plate 12 . If necessary, the spacer 3 and the side wall of the shell 1 along the thickness direction, that is, the upper cover plate 11 and the lower cover plate 12 can also be formed separately, and can be connected with the upper cover plate 1 by bonding/welding. The cover plate 11 and the lower cover plate 12 are connected.

As shown in FIG. 3A , the backflow liquid absorbing core 23 is linear, and the spacer 3 can be an integral structure. In addition, each sub-capillary 231 of the second flow-guiding liquid-absorbent core 22 is a curved structure; or, the second flow-guiding liquid-absorbent core 22 can also be in other shapes, such as a straight line (see Figure 4A that will be described below) or an arc. shape (see Figure 9A described below).

FIG. 4A is a schematic top view of the heat sink provided by the second embodiment of the present application after the upper cover plate is removed. As shown in FIG. 4A , the liquid-absorbent core structure 2 may further include a third flow-guiding liquid-absorbent core 24 . The third flow-guiding liquid-absorbing core 24 is located in the condensation area b, and is connected with the second end D2 of the second flow-guiding liquid-absorbing core 22 and the return liquid-absorbing core 23, and the third flow-guiding liquid-absorbing core 24 is used to connect the second flow-guiding liquid-absorbing core 24 The liquid in the flow-absorbing core 22 is guided into the return-flow absorbing core 23 , that is, the third flow-guiding liquid-absorbing core 24 is used to collect the condensate in the second flow-guiding liquid-absorbing core 22 . And, because the steam at one end of the condensation zone b away from the evaporation zone b is easy to condense into liquid, or in other words, there is more liquid formed here, so the third flow-guiding liquid-absorbing core 24 can be arranged here, so that the The liquid is guided to the return wick 23.

Wherein, the extension direction of the third flow-guiding liquid-absorbing core 24 and the extending direction of the second flow-guiding liquid-absorbing core 22 can be designed according to specific work requirements. In FIG. 4A, in a group of evaporation zones a and condensation zones b arranged along the first direction, the third flow-guiding liquid-absorbing core 24 extends along the second direction, the second direction is perpendicular to the thickness direction of the shell 1, and Set at an angle to the first direction. For example, the second direction is the width direction or the length direction of the casing 1 . It can be understood that the second direction can also be other directions of the casing 1 except the length direction and the width direction. In the embodiment of the present application, the first direction is the length direction of the housing 1 and the second direction is the width direction of the housing 1 as an example. At this time, the angle between the first direction and the second direction is 90 degrees, that is, two or set vertically. The second flow-guiding wick 22 extends from the third flow-guiding wick 24 toward the evaporation zone a, and the first end D1 of the second flow-guiding wick 22 is opposite to the second end of the second flow-guiding wick 22 D2 is close to evaporation zone a. At this time, the second flow-guiding liquid-absorbent core 22 can extend along the first direction. And, among the plurality of sub-wicks 221 of the second flow-guiding wick 22 on one side of the return wick 23, the first ends of the sub-wicks 221 positioned in the middle may extend beyond the sub-wicks 221 positioned at both sides. The first end of the liquid-absorbent core 221 .

Continuing to refer to FIG. 4A , the first flow-guiding liquid-absorbing core 21 includes a rod-shaped flow-guiding portion 213 and a plurality of branch flow-guiding portions 214 arranged side by side and at intervals, and each branch flow-guiding portion 214 is away from the rod-shaped flow-guiding portion 213 along the The rod-shaped air guide part 213 is linear and extends along the first direction, and a plurality of branch air guide parts 214 are disposed on the side of the rod-shaped air guide part 213 facing the steam along the second direction. In FIG. 4A , the rod-shaped air guide part 213 is located in the middle of the housing along the second direction, and a plurality of branch air guide parts 214 are respectively provided on both sides of the rod-shaped air guide part 213 along the second direction. Moreover, in one example, both sides of each branch guide part 214 along the thickness direction are respectively in contact with the side wall of the casing 1, that is, the branch guide parts 214 are in a parallel structure; or, in another example, each One side of the branch guide part 214 along the thickness direction is in contact with the side wall of the housing 1, and the other side of each branch guide part 214 along the thickness direction is spaced apart from the side wall of the housing 1, that is, the branch guide part 214 for serial architecture.

Further, at least one return wick 23 may include one or more than two first return wicks 231 . In FIG. 4A , the return wick 23 includes only one first return wick 231 . The first return liquid-absorbing core 231 is located in the middle of the housing 1 along the second direction, and the two sides of the first return-flow liquid-absorbing core 231 are respectively provided with the second flow-guiding liquid-absorbing core 22; The end is connected with the middle part of the third flow-guiding liquid-absorbing core 24. In addition, spacers 3 are provided on both sides of the backflow absorbent core 23 along the second direction. The return wick 23 includes a bent multi-segment structure, and each spacer 3 may include a plurality of segments arranged at intervals along the extending direction of the return wick 23 .

In addition, in FIG. 4A , the first part P1 of the steam flow channel includes the first space between the return wick 23 and the second flow-guiding wick 22 , that is, the innermost sub-wick 221 , the shell 1 and the innermost sub-wick 221 . The second flow-guiding liquid-absorbent core 22 is the second interval space between the outermost sub-absorbent cores 221 and the third interval space between adjacent sub-absorbent cores 221 . The second part P2 of the vapor flow path comprises a first spacer region between the first flow-guiding wick 21 and the annular support structure 13 of the housing 1 and a return wick 23 (not connected to the second flow-guiding wick 22 ). Adjacent location) towards the second spaced area on the steam side.

FIG. 4B is a schematic cross-sectional structural view of the heat sink shown in FIG. 4A at the lines A-A, B-B and C-C. In Fig. 4B, it can be seen from the cross-sectional view of A-A that the first flow-guiding liquid-absorbing core 21 (including the rod-shaped guiding part 213 and a plurality of branched guiding parts 214) in the evaporation area a adopts a parallel structure; The liquid core 23 adopts a parallel structure; it can be seen from the C-C sectional view that the second diversion liquid core 22 in the condensation area b adopts a parallel structure; that is, the liquid core structure 2 can all adopt a parallel structure design. It can be understood that the first diversion wick 21, the second diversion wick 22 and the return wick 23 can also adopt a serial structure or a part of the three adopts a serial structure, and the other part adopts a serial structure. parallel architecture.

In the heat dissipation device of the second embodiment of the present application, the suspended first end D1 of the second flow-guiding liquid-absorbing core 22 first contacts the steam, so that the flow direction of the liquid in the second flow-guiding liquid-absorbing core in the condensation area b is consistent with the space. The flow direction of the gas in the cavity is the same, thereby eliminating the hindrance effect of the droplet carrying on the backflow, making the pressure drop of the steam flow in the cavity smaller, and improving the temperature uniformity.

FIG. 5A is a top structural schematic diagram of a modification of the heat dissipation device shown in FIG. 4A . The difference from the heat sink shown in FIG. 4A is that, in FIG. 5A , the second flow-guiding liquid-absorbing core 22 is a plate-shaped structure, and one side of the second flow-guiding liquid-absorbing core 22 along the thickness direction is connected to the housing 1 The side wall of the second guide liquid wick 22 is spaced apart from the side wall of the housing 1 along the other side of the thickness direction to form a second space for the steam flow channel. At this time, the second guide liquid wick 22 is a serial structure. Since the second flow-guiding liquid-absorbing core 22 is a plate-shaped structure, it generally occupies a relatively large space in the condensation area. In order to ensure that the steam can flow to the end of the condensation area b away from the evaporation area a, so as to condense into liquid as soon as possible, this At this time, the second flow-guiding liquid-absorbent core 22 can choose a serial structure, so that the other side of the second flow-guiding liquid-absorbent core 22 along the thickness direction is spaced apart from the side wall of the housing 1, and a space for steam flow can be formed. In addition, the spacers 3 provided on both sides of the backflow absorbent core 23 may be of an integral structure.

In addition, in FIG. 5A , the second flow-guiding wick 22 is a plate-shaped structure, and the first part P1 of the steam flow channel may include a first space between the return-flow wick 23 and the second flow-guiding wick 22 1. The second space between the annular support structure 13 of the casing 1 and the second flow-guiding liquid-absorbing core 22 and the side wall of the casing 1 that is the upper cover between the side wall of the second flow-guiding liquid-absorbing core 22 in the thickness direction The second space between the board 11 or the lower cover board 12 . The second part P2 of the vapor flow channel includes the first spacer area between the first flow-guiding wick 21 and the annular support structure 13 of the housing 1 and the return wick 23 (the second flow-guiding wick 22 is not provided. The position) towards the second spacer area at the steam side.

FIG. 5B is a schematic cross-sectional structure diagram of the heat dissipation device shown in FIG. 5A at the line A-A and line B-B. As shown in FIG. 5B , the second diversion wick 22 in the condensation zone b adopts a serial structure, and the return wick 23 adopts a parallel structure, that is, the liquid wick structure 2 adopts a combination of series and parallel. The flow direction of the reflux condensate in the second flow-guiding liquid-absorbing core 22 in the condensation zone b is the same as the flow direction of the steam in the cavity, which is the direction from the evaporation zone a to the condensation zone b.

FIG. 6A is a schematic top view of a modification of the heat dissipation device shown in FIG. 5A . The difference from the heat sink shown in FIG. 5A is that, in FIG. 6A, the first flow-guiding liquid-absorbent core 21 includes a plate-shaped main body 211, and one side of the first flow-guiding liquid-absorbent core 21 along the thickness direction is connected to the shell. The side wall of the body 1 is in contact, and the other side of the first flow-guiding liquid-absorbing core 21 is spaced apart from the side wall of the housing 1 along the thickness direction, that is, the first flow-guiding liquid-absorbing core 21 is a serial structure.

In addition, in FIG. 6A, the first portion P1 of the steam flow path is the same as that in FIG. 5A. The second part P2 of the steam flow channel includes the first space between the first guide liquid-absorbing core 21 and the upper cover plate 11 or the lower cover plate 12 of the housing 1 and the return liquid-absorbent core 23 (the second guide liquid absorbing core 23 is not provided. The part where the wick 22 flows) faces the second spacer area on the steam side.

FIG. 6B is a schematic cross-sectional structural diagram of the heat dissipation device shown in FIG. 6A at line A-A. As shown in Figure 6B, the first flow-guiding liquid-absorbing core 21 and the second flow-guiding liquid-absorbing core 22 adopt a serial structure, and the third flow-guiding liquid-absorbing core 24 adopts a parallel structure, that is, the liquid-absorbing core structure 2 adopts a series-parallel combination The way.

FIG. 7 is a top structural schematic diagram of a modification of the heat dissipation device shown in FIG. 6A . The difference from the heat sink shown in FIG. 6A is that, in FIG. 7 , the first flow-guiding liquid-absorbing core 21 also includes a plurality of branch parts 212 arranged at intervals, and each branch part 212 is respectively arranged on both sides along the thickness direction. It is connected with the plate-shaped main body 211 and the side wall of the housing 1, and the return wick 23 is connected with at least one of the plate-shaped main body 211 and the plurality of branch parts 212, that is, the first flow-guiding wick 21 is combined in series and parallel. The way. In addition, at least one return liquid-absorbing core 23 includes more than two return-flow liquid-absorbing cores 23 located in the middle of the housing 1 along the second direction, and the second end of each return-flow liquid-absorbing core 23 is provided with a third flow-guiding liquid-absorbing core 24, and the third flow-guiding liquid-absorbing core 24 at the second end of different return-flow liquid-absorbing core 23 is arranged at intervals, the width of the third flow-guiding liquid-absorbing core 24 is greater than the width of the returning liquid-absorbing core 23, and each third guide The flow wick 24 is connected to at least part of the second flow wick 22 . Spacers 3 are provided on both sides of each return wick 23 along the second direction.

That is to say, the liquid-absorbing core structure 2 adopts a series-parallel combination, specifically, the first flow-guiding liquid-absorbing core 21 in the evaporation area a adopts a series-parallel combination, and the second flow-guiding liquid-absorbing core 22 in the condensation area b Using a serial structure, the backflow liquid-absorbing core 23 can use a parallel structure, and there can be multiple. The liquid-absorbent core structure 2 of this embodiment can also realize that the flow direction of the return condensate in the second flow-guiding liquid-absorbent core 22 in the condensation zone b is the same as the flow direction of the steam in the cavity. In addition, the third flow-guiding liquid-absorbing core 24 at the second end of different return-flow liquid-absorbing cores 23 can be arranged at intervals to connect different positions of the second flow-guiding liquid-absorbing core 22, so that in the second flow-guiding liquid-absorbing core 22 Liquids at different locations can enter the corresponding return wicks 23 through the connected third flow-guiding wicks 24 .

Further, in FIG. 7 , the second flow-guiding liquid-absorbent core 22 is a plate-shaped structure, and the first part P1 of the steam flow channel may include one side of the second flow-guiding liquid-absorbent core 22 along the thickness direction and the upper surface of the casing 1. In the space between the cover plate 11 or the lower cover plate 12, there is no area where the backflow liquid-absorbing core 23 and the third flow-guiding liquid-absorbing core 24 are provided. The first part P1 of the vapor flow channel may also include a second space between the annular support structure 13 of the housing 1 and the second flow-guiding wick 22 . The second part P2 of the vapor flow path includes a first spacer area between the first flow-guiding wick 21 and the housing 1 (such as one of the upper cover plate 11 and the lower cover plate 12 and/or the annular support structure 13) And the return liquid absorbent core 23 (the part where the second flow guide liquid absorbent core 22 is not provided) is facing the second interval area at the side of the steam.

FIG. 8A is a schematic top view of the heat sink provided by the third embodiment of the present application after the upper cover is removed. The difference from the heat sink shown in FIG. 4A is that in FIG. 8A , at least one return wick 23 includes a second return wick 232 , and the second return wick 232 is located on the casing 1 along the second direction. On one side of the return wick 23, the side of the side away from the housing 1 is provided with a second flow-guiding wick 22; the second end D2 of the second reflux wick 232 is connected to the third flow-guiding wick 24 is connected at one end. A spacer 3 is provided on the side of the return wick 23 away from the housing 1 . The spacer 3 can be a segmented structure and only includes one segment. The first flow-guiding liquid-absorbent core 21 includes a rod-shaped flow-guiding portion 213, one side of the rod-shaped flow-guiding portion 213 is arranged in contact with the side wall of the housing 1 along the second direction, and the side wall of the rod-shaped flow-guiding portion 213 is arranged along the second direction. A plurality of branch guides 214 are provided on the other side. The second flow-guiding wick 22 can extend along a first direction, and the third flow-guiding wick 24 can extend along a second direction.

In addition, in FIG. 8A , the first part P1 of the steam flow channel includes the first space between the return wick 23 and the second flow-guiding wick 22 , that is, the innermost sub-wick 221 , the shell 1 and the innermost sub-wick 221 . The second flow-guiding liquid-absorbent core 22 is the second interval space between the outermost sub-absorbent cores 221 and the third interval space between adjacent sub-absorbent cores 221 . The second part P2 of the vapor flow channel includes the first spacer area between the first flow-guiding wick 21 and the annular support structure 13 of the housing 1 and the return wick 23 (the second flow-guiding wick 22 is not provided. The position) towards the second spacer area at the steam side.

FIG. 8B is a schematic cross-sectional structural view of the heat dissipation device shown in FIG. 8A at the lines A-A, B-B and C-C. In Fig. 8B, it can be seen from the cross-sectional view of A-A that the return wick 23 adopts a parallel structure; it can be seen from the sectional view of B-B that the second diversion liquid-absorbing core 22 in the condensation zone b adopts a parallel structure; The three diversion liquid-absorbing cores 24 adopt a parallel structure.

In addition, in the cooling device shown in FIG. 3A , FIG. 4A , FIG. 5A , and FIG. 6A , the return liquid-absorbing core 23 includes a first return-flow liquid-absorbing core 231 , and the first return liquid-absorbing core 231 is located in the housing 1 along the second direction. , in the heat sink shown in FIG. 8A , the return wick 23 includes a second return wick 232 , and the second return wick 232 is located on one side of the housing 1 along the second direction. In other embodiments, the backflow wick 23 can include the first backflow wick 231 and the second backflow wick 232, and at this time, the second backflow wick 232 can be a serial structure, or can be parallel architecture.

FIG. 9A is a schematic top view of the heat sink provided by the fourth embodiment of the present application after removing the upper cover plate. As shown in FIG. 9A, the condensation zone b expands outward along the direction from close to the evaporation zone a to away from the evaporation zone a, and the return wick 23 extends along the first direction and is located on one side of the evaporation zone a along the second direction. The side of the side of the liquid-absorbing core 23 away from the housing 1, that is, the side facing the steam, is provided with a spacer 3, and one end of the third flow-guiding liquid-absorbing core 24 is connected to the second end of the return-flow liquid-absorbing core 23 near the evaporation zone a. The other end of the third flow-guiding liquid-absorbing core 24 extends along the direction away from the evaporation zone a and the return liquid-absorbing core 23, and the second flow-guiding liquid-absorbing core 22 extends away from the third flow-guiding liquid-absorbing core 24 along the direction away from the evaporation zone The direction a extends and bends toward the return wick 23 , and the second end D2 of the second flow-guiding wick 22 is closer to the evaporation zone a than the first end D1 of the second flow-guiding wick 22 .

The first flow-guiding liquid-absorbent core 21 includes a rod-shaped flow-guiding portion 213, one side of the rod-shaped flow-guiding portion 213 is arranged in contact with the side wall of the housing 1 along the second direction, and the side wall of the rod-shaped flow-guiding portion 213 is arranged along the second direction. A plurality of branch guides 214 are provided on the other side. The second flow-guiding liquid-absorbing core 22 is arc-shaped. The second flow-guiding liquid-absorbent core 22 includes multiple sub-liquid-absorbent cores 221 arranged at intervals, and the multiple sub-liquid-absorbent cores 221 can be configured in parallel or in series. Alternatively, the second flow-guiding liquid-absorbing core 22 is also a plate-shaped structure, and adopts a serial structure.

In addition, in FIG. 9A , the first part P1 of the vapor flow channel includes the first space between the return wick 23 and the second flow-guiding wick 22 , that is, the adjacent sub-wick 221 , the shell 1 and the second wick 221 . The second flow-guiding liquid-absorbent core 22 is the second interval space between adjacent sub-absorbent cores 221 and the third interval space between adjacent sub-absorbent cores 221 . The second part P2 of the vapor flow channel includes the first spacer area between the first flow-guiding wick 21 and the annular support structure 13 of the housing 1 and the return wick 23 (the second flow-guiding wick 22 is not provided. The position) towards the second spacer area at the steam side.

FIG. 9B is a schematic cross-sectional structural view of the heat dissipation device shown in FIG. 9A at lines A-A and B-B. In FIG. 9B , it can be seen from the cross-sectional view of A-A that the return wick 23 adopts a parallel structure; it can be seen from the sectional view of B-B that the second diversion wick 22 and the third diversion wick 24 in the condensation zone b adopt a parallel structure.

In this embodiment, the shape of the liquid-absorbent core structure 2 is adjusted, but it is still ensured that the first end D1 of the second flow-guiding liquid-absorbent core 22 in the condensation zone b, that is, the top, first contacts the steam generated in the evaporation zone a, The steam in the cavity travels in the same direction as the return liquid in the second flow-guiding liquid-absorbing core 22, which is beneficial to the return flow of the condensate.

In addition, in the heat dissipation device of the example of the present application, the shape of the housing 1 can be designed according to needs. In one example, as shown in FIG. 9A , the casing 1 sequentially includes a first area (with an evaporation area a), a second area, and a third area (with a condensation area b) along a first direction. The width is smaller than that of the third area, the second area is an expanded structure, and the small end of the expanded structure is connected to the first area, and the large end of the expanded structure is connected to the third area. It can be understood that the housing 1 can also be in other shapes, such as a rectangular shape, which will be described below with reference to FIG. 10 and FIG. 11 .

FIG. 10 is a schematic top view of the heat sink provided by the fifth embodiment of the present application after removing the upper cover plate. As shown in FIG. 10 , at least one return wick 23 includes a third return wick 233 and a fourth reflux wick 234 respectively located on both sides of the casing 1 along the second direction; The core 22 is located between the third return absorbent core 233 and the fourth return absorbent core 234, and can extend along the first direction; 21 along the first direction is provided with an interval space; the first end D1 of the second flow-guiding liquid-absorbent core 22 can be arranged flush, the second flow-guiding liquid-absorbent core 22 can include a plurality of liquid-absorbent cores 221, and a plurality of sub-absorbent cores 221 The heights of the first ends of the liquid-absorbing cores 221 are basically the same. The third flow-guiding wick 24 can extend along the second direction.

The two ends of the first flow-guiding liquid-absorbing core 21 along the second direction are respectively connected with the respective first ends of the third return-flow liquid-absorbing core 233 and the fourth return-flow liquid-absorbing core 234; The two ends of the direction are respectively connected to the second ends of the third return liquid wick 233 and the fourth return liquid wick 234 .

The first flow-guiding liquid-absorbent core 21 includes a rod-shaped flow-guiding portion 213 and a plurality of branch flow-guiding portions 214 arranged side by side and at intervals. The rod-shaped flow-guiding portion 213 is U-shaped, or in other words, the rod-shaped flow-guiding portion 213 includes two An L-shaped structure, the first side of the L-shaped is connected to the return liquid absorbent core 23, and a plurality of branch guides 214 are arranged on the first or second side of the L-shaped side and towards the inner side of the L-shaped. In Fig. 10, a plurality of branch air guides 214 are arranged on the second side of the L shape, and are located on the side of the rod-shaped air guide 213 facing the steam along the extension direction, and each branch air guide 214 is away from the rod-shaped The direction of the guide part 213 extends.

In this embodiment, the housing 1 is a rectangular body, the width of the evaporation zone a and the condensation zone b are the same, and the evaporation zone a has a relatively large area, and corresponding to the evaporation zone a, multiple heat sources or large-area heat-generating devices can be arranged to dissipate heat. It can be applied to the scene of dissipating heat from multiple heat sources, that is, large-area heat-generating devices.

In addition, in FIG. 10, the first part P1 of the vapor flow channel includes the first space between the return wick 23 or the spacer 3 and the second flow-guiding wick 22, that is, the adjacent sub-wick 221, and The third space between adjacent sub-wicks 221 . The second part P2 of the steam flow channel includes the second spacer area at the steam side of the return wick 23 (the part not adjacent to the second flow-guiding wick 22 ), that is, at the side of the first flow-guiding wick 22 . 21 and the first end D1 of the second flow-guiding liquid-absorbent core 22 , the space formed by the third return-flow liquid-absorbent core 233 and the fourth return-flow liquid-absorbent core 234 .

FIG. 11 is a schematic top view of the heat sink provided by the sixth embodiment of the present application after removing the upper cover plate. As shown in FIG. 11 , the inner space of the casing 1 includes a first evaporation zone a1 and a first condensation zone b1 arranged along the first direction, and a second evaporation zone a2 and a second condensation zone b2 arranged along the first direction. An evaporation zone a1 and a second condensation zone b2 are arranged side by side along the second direction, and are located at the first end of the shell 1 along the first direction; the first condensation zone b1 and the second evaporation zone a2 are side by side along the second direction set, and located at the second end of the housing 1 along the first direction; the second flow-guiding liquid-absorbing core 22 of the first condensation area b1 and the first air-guiding liquid-absorbing core 21 of the second evaporation area a2 and the first evaporation A space is provided between the first flow-guiding liquid-absorbent core 21 in the area a1 and the first flow-guiding liquid-absorbent core 21 in the second condensation area b2.

The return wick 23 includes a fifth return wick 235 and a sixth return wick 236, the fifth return wick 235 is located on the first side of the housing 1 along the second direction, and the sixth return wick 236 Located on the second side of the housing 1 along the second direction, the fifth return wick 235 connects the first flow-guiding wick 21 in the first evaporation zone a1 and the third flow-guiding wick 235 in the first condensation zone b1 24 at their respective first ends along the second direction, the sixth return wick 236 connects the first flow-guiding wick 21 of the second evaporation zone a2 and the third flow-guiding wick 24 of the second condensation zone b2 respectively the second end of in the second direction. In addition, a spacer 3 may be provided on the side of the return wick 23 facing the steam, so as to isolate the steam flowing in the opposite direction from the reflux liquid in the return wick 23 .

The first flow-guiding liquid-absorbent core 21 includes a rod-shaped flow-guiding portion 213 and a plurality of branch flow-guiding portions 214 arranged side by side and at intervals. The cores 23 are connected, and a plurality of branch flow guiding parts 214 are arranged on the second side of the L-shape and face to the inner side of the L-shape. Moreover, a plurality of branch air guides 214 are disposed on the side of the rod-shaped air guide 213 facing the steam along the second direction, and each branch air guide 214 extends in a direction away from the rod-shaped air guide 213 .

Further, the two ends of the rod-shaped guide part 213 in the first evaporation zone a1 are respectively connected with the fifth return wick 235 and the third flow guide wick 24 in the second condensation zone b2; the second evaporator zone Both ends of the rod-shaped guide part 213 in a2 are respectively connected to the sixth return wick 236 and the third flow guide wick 24 in the first condensation zone b1, so that the wick structure 2 can form a closed ring. In addition, the diversion wicks in each evaporation zone and condensation zone can be designed in parallel or in series.

The second flow-guiding wick 22 can extend along the first direction. The third flow-guiding wick 24 can extend along the second direction. In order to make the second flow-guiding wick 22 of the first condensation zone b1 and the first flow-guiding wick 21 of the second evaporation zone a2 and the first flow-guiding wick 21 and the second condensate of the first evaporation zone a1 Spaces are formed between the first flow-guiding wicks 21 in the zone b2, and in the first condensation zone b1, the second flow-guiding wicks 22, such as a plurality of sub-wicks 221, extend along the first evaporation zone a1 to the second evaporation zone a1. The direction length of the zone a2 decreases; in the second condensation zone b2, the length of the second flow-guiding wick 22 such as a plurality of sub-wicks 221 increases along the direction from the first evaporating zone a1 to the second evaporating zone a2. That is to say, in this implementation, the first end D1 of the second flow-guiding wick 22 in the first condensation area b1 forms an inclined structure, and the first end D1 of the second flow-guiding wick 22 in the second condensation area b2 The end D1 forms an inclined structure, and two inclined structures can be arranged in parallel and spaced apart to form a space between them.

In addition, in FIG. 11 , the first part P1 of the vapor flow channel includes the first space between the return wick 23 or the spacer 3 and the second flow-guiding wick 22 , that is, the adjacent sub-wick 221 and The third space between adjacent sub-wicks 221 . The second part P2 of the steam flow channel includes a second spacer area on the steam side of the return wick 23 (the part not adjacent to the second flow guide wick 22 ), specifically, the second spacer area can be The space between the first flow-guiding liquid-absorbent core 21 and the second flow-guiding liquid-absorbent core 22 , that is, the first ends D1 of the plurality of sub-liquid-absorbent cores 221 .

In this embodiment, two evaporation areas are provided, that is, the first evaporation area a1 and the second evaporation area a2, and a heat generating device can be provided corresponding to each evaporation area, so it is applicable to the scenario of multiple heat sources. The cooling device satisfies the characteristic that the steam generated in the evaporation area first contacts the top of the second flow-guiding liquid-absorbing core 22 in the condensation area, that is, the first end D1, and can also realize the same flow of gas and liquid in the condensation area. It should be noted that this embodiment is only an example of the application scenario of two heat sources, and corresponding changes can also be made according to specific work needs, such as setting more evaporation zones, or setting more condensation zones, or adjusting evaporation The location and shape of the zone and condensation zone, etc.

In addition, the manufacturing process of heat dissipation devices such as vapor chambers includes air extraction to achieve internal vacuum, and it is necessary to design air extraction ports on the edge of the vapor chamber. Since the condensation area has higher requirements on the flatness of the vapor chamber, the air extraction port is generally arranged in the evaporation area.

FIG. 12 is a top structural schematic diagram of a heat sink with the upper cover plate removed. As shown in FIG. 12 , the heat dissipation device includes an evaporation area and a condensation area, and a liquid-absorbing core such as a capillary structure is located in the cavity inside the supporting structure of the housing. In the solution shown in Figure 12, since the opening of the inner chamber formed by the liquid-absorbing core is facing away from the suction port, the cavity between the liquid-absorbing cores in the condensation area is prone to gas residue during the vacuuming process, which will form an uneven structure , that is, there is a problem that the gas in the inner cavity cannot be extracted cleanly.

However, in the multiple embodiments described above in the present application, the path of the cavity flow channel is simple, and the opening of the inner chamber formed by the liquid-absorbing core structure 2 faces the air inlet, and the air inlet H of the evaporation area a can transfer the air in the inner cavity. The gas is extracted quickly and cleanly, and the cavity at the second flow-guiding liquid-absorbing core 22 in the condensation zone b is not easy to have gas residue during the vacuuming process, avoiding the formation of uneven structures. Wherein, the suction port H is exemplarily shown in FIG. 4A and FIG. 10 .

Specifically, for the convenience of vacuuming, the embodiment of the present application may have but not limited to the following two solutions:

Scheme 1—as shown in Figure 4A, the liquid-absorbing core structure 2 does not form a closed structure in the casing 1, and the casing 1 is provided with an air suction port H, and the air suction port H corresponds to one of the evaporation area a and the condensation area b , the suction port H communicates directly with one of the evaporation zone a and the condensation zone b. In Fig. 4, the air extraction port H corresponds to the evaporation area a, and the evaporation area a communicates with the condensation area b, so the evaporation area a and the condensation area b can be pumped through the air extraction port H.

Scheme 2—as shown in Figure 10, the liquid-absorbing core structure 2 forms a closed structure in the casing 1, and the casing 1 is provided with an air suction port H, and the air suction port H corresponds to one of the evaporation area a and the condensation area b, The liquid-absorbing wick structure 2 at one of the evaporation area a and the condensation area b is provided with a through opening K, and the air suction port H communicates with one of the evaporation area a and the condensation area b through the through opening K. In FIG. 10, the suction port H corresponds to the evaporation zone a. The liquid-absorbing core structure 2 at the evaporation area a is provided with a through opening K, and the air suction port H communicates with the evaporation area a through the through opening K, and the evaporation area a communicates with the condensation area b, so it can pass through the air suction port H and the through opening K Evaporation zone a and condensation zone b are pumped.

It should be noted that, if the liquid-absorbing core structure 2 forms a closed structure in the housing 1, and the closed structure adopts a parallel structure, at this time, a through opening K can be provided on the closed structure so as to be connected with the air suction port H on the housing 1. Connected, and then realize the extraction of the evaporation zone a and the condensation zone b through the suction port H and the through opening K. It can be understood that if the closed structure adopts a serial structure, the through opening K may not be provided at this time, and the air suction port H on the shell 1 may directly communicate with one of the evaporation area a and the condensation area b.

In the heat dissipation device of the embodiment of the present application, the first flow-guiding liquid-absorbing core 21, the second flow-guiding liquid-absorbing core 22, the backflow liquid-absorbing core 23 and the spacer 3 mainly include the following contents:

1. The first flow-guiding liquid-absorbing core 21 can expand the contact area between the liquid-absorbing core structure and the cavity in the evaporation area, increase the evaporation rate, and guide the flow direction of the airflow. The first flow-guiding liquid-absorbing core 21 can have but not limited to the following four schemes:

Scheme 1—the first flow-guiding liquid-absorbing core 21 includes a rod-shaped flow-guiding portion 213, and the rod-shaped flow-guiding portion 213 can be a serial structure or a parallel structure, as shown in Figure 3A;

Solution 2—Based on solution 1, the first flow-guiding liquid-absorbing core 21 further includes a plurality of branch flow-guiding parts 214, and the plurality of branch flow-guiding parts 214 may be in a serial structure or in a parallel structure. Wherein, the rod-shaped flow guide part 213 can be linear, as shown in Figure 4A, Figure 5A, Figure 8A, and Figure 9A; or, the rod-shaped flow guide part 213 can be L-shaped, as shown in Figure 10 and Figure 11, The rod-shaped guide part 213 in FIG. 10 can be regarded as a U-shape formed by splicing two L-shape;

Scheme 3——the first flow-guiding liquid-absorbing core 21 includes a plate-shaped main body 211, and the plate-shaped main body 211 is a serial structure, as shown in FIG. 6A;

Solution 4—On the basis of solution 1, the first flow-guiding liquid-absorbing core 21 further includes a plurality of branch parts 212, and the two sides of each branch part 212 along the thickness direction are connected to the sides of the plate-shaped main body 211 and the housing 1 respectively. Wall connection, the branch part 212 can be a serial structure or a parallel structure, as shown in FIG. 7 .

2. Compared with the side of the second flow-guiding liquid-absorbing core 22 in the condensation zone b (that is, the suspended first end D1), the top of the second flow-guiding liquid-absorbing core 22 in the condensation zone b first contacts Evaporate the gas flowing out of zone a. The flow direction of the condensate in each second flow-guiding liquid-absorbing core 22 is consistent with the flow direction of the gas in the cavity. The second flow-guiding liquid-absorbing wick 22 extending from the condensation area is not connected to the first flow-guiding liquid-absorbing wick 21 extending from the evaporation area a, that is, the first end D1 of the second flow-guiding liquid-absorbing wick 22 is suspended. The second flow-guiding liquid-absorbent core 22 can have but not limited to the following two options:

Scheme 1—the second flow-guiding liquid-absorbent core 22 includes a plurality of sub-absorbent cores 221 arranged at intervals, and the sub-liquid-absorbent cores 221 can be of a serial structure or a parallel structure, and can be curved, as shown in FIG. 3A It can be linear, as shown in Figure 4A, Figure 8A, Figure 10 and Figure 11; it can be arc-shaped, as shown in Figure 9A.

Scheme 2—the second flow-guiding liquid-absorbing core 22 is a plate-shaped structure and a serial structure, as shown in FIG. 5A , FIG. 6A and FIG. 7 .

In addition, the second flow-guiding liquid-absorbing core 22 can also be in other shapes, or can also be a combination of a serial structure and a parallel structure.

3. The return wick 23 extends from the evaporating zone a to the condensing zone b, and can absorb and transport the liquid in the condensing zone b to the evaporating zone a. Backflow liquid absorbent core 23 can have but not limited to the following four schemes:

Scheme 1——the backflow wick 23 includes a first backflow wick 231 located in the middle of the housing 1, as shown in Fig. 3A, Fig. 4A, Fig. 5A and Fig. 6A;

Solution 2—the return wick 23 includes more than two return wicks 23 located in the middle of the housing 1, and the second end of each return wick 23 is provided with a third flow-guiding wick 24, and different The third flow-guiding liquid-absorbing core 24 at the second end of the return-flow liquid-absorbing core 23 is arranged at intervals, as shown in FIG. 7 ;

Solution 3—the return wick 23 includes a second return wick 232 located on one side of the housing 1, as shown in FIG. 8A ;

Scheme 4——The return wick 23 extends along the first direction and is located on one side of the evaporation zone a, and one end of the third diversion wick 24 is connected to the second end of the return wick 23 near the evaporation zone a , the other end of the third flow-guiding liquid-absorbent core 24 extends in a direction away from the evaporation zone a and the return liquid-absorbent core 23, as shown in FIG. 9A;

Solution 5—the return wick 23 includes a third return wick 233 and a fourth return wick 234 respectively located on both sides of the housing 1 , the third return wick 233 and the fourth return wick 234 is located in the same condensation zone b, as shown in Figure 10;

Solution 6—the return wick 23 includes the fifth return wick 235 and the sixth return wick 236 respectively located on both sides of the housing 1, the fifth return wick 235 and the sixth return wick 236 are located in different condensation areas, as shown in FIG. 11 .

In addition, the backflow wick 23 can also be other schemes, such as a combination of scheme 1 and scheme 2, that is, the backflow wick 23 includes a first backflow wick 231 located in the middle of the housing 1 and a first backflow wick 231 located on one side of the housing 1. Second return wick 232 .

Further, the two sides of the return liquid absorbing core 23 along the thickness direction may be in contact with the side walls of the housing 1 respectively, that is, the return liquid absorbing core 23 is a parallel structure. Alternatively, one side of the backflow absorbent core 23 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the backflow absorbent core 23 in the thickness direction is spaced apart from the side wall of the housing 1, that is, the backflow absorbent The core 23 has a serial structure, and the side along the thickness direction of the return liquid wick 23 in contact with the side wall of the housing 1 can be the side close to the heat generating device or the side away from the heat generating device. In one example, if the heating element is in contact with the lower cover plate 12 of the housing 1, the return wick 23 of the serial structure can be arranged on the inner surface of the lower cover plate 12, that is, in contact with the inner surface of the lower cover plate 12 , and spaced apart from the inner surface of the upper cover plate 11 to form a space for steam to flow.

Preferably, the return wicks 23 are of a parallel structure. The rest of the flow-guiding liquid-absorbing cores can be in parallel or in series. Also, a single material may be used, or multiple materials may be used, and only one structure may be included, or multiple structures may be included.

4. The spacer 3 is arranged on the side of each return wick 23 facing the steam along the extending direction, wherein:

When the return absorbent core 23 is located in the middle of the housing 1, spacers 3 are respectively provided on both sides of the return absorbent core 23 along the extension direction, as shown in Fig. 3A, Fig. 4A, Fig. 5A, Fig. 6A and Fig. 7;

When the return wick 23 is located on one side of the shell 1, the side of the reflux wick 23 along the extending direction away from the side of the shell 1 faces the steam, so a spacer 3 needs to be provided, as shown in Fig. 8A, Fig. 9A, Figure 10 and Figure 11.

In addition, the spacer 3 provided on one side of the backflow absorbent core 23 can be an integral structure, as shown in Figure 3A, Figure 5A, Figure 6A, Figure 7, Figure 9A, Figure 10 and Figure 11; The spacer 3 provided on one side of the wick 23 may include a plurality of segments arranged at intervals along the extension direction of the return wick 23, as shown in FIG. 4A, each spacer 3 includes two segments; as shown in FIG. 8A , the spacer 3 includes a segment.

Further, the spacer 3 can be integrally formed or separately formed with the side wall of one side of the housing 1 along the thickness direction.

To sum up, the serial architecture and parallel architecture cooling devices, such as the cold end of the vapor chamber, that is, the reverse flow of steam in the condensation area will carry the liquid and make the liquid stagnate in the condensation area, which is not conducive to the return of the condensed liquid to the evaporation area. The scheme of the embodiment of the present application makes the first end of the second flow-guiding liquid-absorbent wick in the condensation zone, that is, the top, preferentially contact the gas flowing out of the evaporation zone, so that the gas and liquid near the second flow-guiding liquid-absorbent wick in the condensation zone are simultaneously Direct flow eliminates the carrying effect of the gas-liquid reverse flow on the liquid, which is conducive to the return of the condensed liquid to the evaporation area, which is not easy to dry out, and improves the uniform temperature performance. , can still meet the requirements of use.

Among them, the return wick extending from the hot end (evaporation area) to the cold end (condensation area) can adopt a parallel architecture and a serial architecture. Further, since the flow direction of the liquid in the return wick is opposite to the flow direction of the steam , so a spacer can be installed on the side of the return wick facing the steam along the extension direction to isolate the steam from the liquid in the reflux wick and prevent the reverse flow of steam from carrying liquid droplets and causing the condensate droplets to stay in the condensate At the same time, the spacer can also play a supporting role, which improves the structural strength.

In addition, in the heat dissipation device of the embodiment of the present application, the path of the flow channel in the cavity is simple, and the opening of the inner chamber formed by the liquid-absorbing core structure faces the air suction port, and the gas in the cavity can be quickly extracted through the air suction port in the evaporation area. , the cavity at the second diversion liquid-absorbent core in the condensation area is not prone to gas residues during the vacuuming process, avoiding the formation of uneven structures.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present application, and limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be used for the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the application.

Claims

A cooling device, characterized in that it comprises:

A housing (1) and a fluid working medium accommodated in the housing (1), the inner space of the housing (1) includes at least one group of evaporation zones (a) and condensation zones (a) arranged along a first direction b), the first direction is perpendicular to the thickness direction of the casing (1), and the evaporation area (a) is used to be arranged at the heating device, so that the fluid working medium in the evaporation area (a) forming steam and flowing towards said condensation zone (b);

A liquid-absorbing core structure (2), arranged in the housing (1) and forming a steam flow channel in the housing (1), the liquid-absorbing core structure (2) comprising a first flow-guiding liquid-absorbing core (21), a second flow-guiding liquid-absorbent core (22) and at least one return liquid-absorbent core (23), the first flow-guiding liquid-absorbent core (21) is located in the evaporation zone (a), and the second The first end (D1) of the diversion liquid-absorbent core (22) is suspended, the second end (D2) of the second diversion liquid-absorbent core (22) is located in the condensation area (b), and the return suction The first end of the liquid core (23) is connected to the first flow-guiding liquid-absorbing core (21), and the second end of the return-flow liquid-absorbing core (23) is connected to the second flow-guiding liquid-absorbing core (22) The second end (D2) of the connection;

Wherein, the steam flow channel includes a first part (P1) adjacent to the second flow-guiding liquid-absorbent core (22), and the first end (D1) of the second flow-guiding liquid-absorbent core (22) to The extending direction of the second end (D2) of the second flow-guiding liquid-absorbing core (22) is consistent with the extending direction of the first part (P1) of the steam flow channel, and along the extending direction of the steam flow channel The first end (D1) of the second flow-guiding liquid-absorbent core (22) is closer to the evaporation zone (a) than the second end (D2) of the second flow-guiding liquid-absorbent core (22).
The cooling device according to claim 1, characterized in that:

The first end (D1) of the second flow-guiding liquid-absorbing core (22) extends to the evaporation zone (a), and one end of the first part (P1) of the steam flow channel communicates with the evaporation zone (a), so The other end of the first part (P1) of the vapor flow channel extends to the second end of the return wick (23); or,

The first end (D1) of the second flow-guiding liquid-absorbing core (22) is located in the condensation area (b), and the steam flow channel also includes a second part (P2), and the second part (P2) of the steam flow channel One end of the part (P2) communicates with the evaporation zone (a), and the other end of the second part (P2) of the steam flow channel communicates with one end of the first part (P1) of the steam flow channel and the second guide The first end (D1) of the flow wick (22), the other end of the first portion (P1) of the vapor flow channel extends to the second end of the return wick (23).
The cooling device according to claim 1 or 2, characterized in that:

The first part (P1) of the steam flow channel includes a first space between the return wick (23) and the second diversion wick (22) and the housing (1) and At least one of the second interval spaces between the second flow-guiding liquid-absorbent cores (22); and/or,

The second part (P2) of the vapor flow path includes a first spacer area between the first flow-guiding wick (21) and the housing (1) and the return wick (23) At least one of the second spacing regions at the side facing the steam.
The heat dissipation device according to any one of claims 1-3, characterized in that, the second guide liquid-absorbent core (22) comprises a plurality of sub-absorbent cores (221) arranged at intervals, and the plurality of sub-absorbent cores (221) The respective second ends of the liquid cores (221) are connected to the return liquid-absorbent core (23), the respective first ends of the plurality of sub-liquid-absorbent cores (221) are suspended, and the first part (P1 ) includes a third space between adjacent sub-absorbent cores (221).
The cooling device according to claim 4, characterized in that:

Both sides of each sub-liquid-absorbent core (221) along the thickness direction are respectively in contact with the side wall of the housing (1); or,

One side of each sub-liquid-absorbent core (221) is in contact with the side wall of the housing (1) along the thickness direction, and the other side of each of the sub-liquid-absorbent cores (221) is along the thickness direction It is spaced apart from the side wall of the housing (1) to form a second space for the steam flow channel.
The heat dissipation device according to any one of claims 1-3, characterized in that, the second flow-guiding liquid-absorbing core (22) is a plate-shaped structure, and the second flow-guiding liquid-absorbing core (22) is One side in the thickness direction is in contact with the side wall of the housing (1), and the second flow-guiding liquid-absorbent core (22) is spaced apart from the side wall of the housing (1) along the other side in the thickness direction , so as to form the second interval space of the steam flow channel.
The heat dissipation device according to any one of claims 1-6, characterized in that, the liquid-absorbing core structure (2) further comprises:

The third flow-guiding liquid-absorbent core (24), located in the condensation area (b), and connected to the second end (D2) of the second flow-guiding liquid-absorbing core (22) and the return liquid-absorbing core (23 ) connection, the third flow-guiding liquid-absorbent core (24) is used to guide the liquid in the second flow-guiding liquid-absorbent core (22) into the return flow-absorbent core (23).
The heat dissipation device according to claim 7, characterized in that, in a group of evaporation regions (a) and condensation regions (b) arranged along the first direction, the third flow-guiding liquid-absorbing core (24) Extending along a second direction, the second direction is perpendicular to the thickness direction of the casing (1) and is set at an angle to the first direction, the second flow-guiding liquid-absorbent core (22) extends from the The third flow-guiding liquid-absorbent core (24) extends toward the evaporation area (a), and the first end (D1) of the second flow-guiding liquid-absorbent core (22) is opposite to the second flow-guiding liquid-absorbent core The second end (D2) of (22) is close to said evaporation zone (a).
The cooling device according to claim 8, characterized in that:

The at least one backflow wick (23) includes one or more first backflow wicks (231), and the first backflow wicks (231) are located along the housing (1) along the In the middle part of the second direction, the two sides of the first return liquid-absorbent core (231) are respectively provided with the second guide liquid-absorbent core (22); the second of the first return liquid-absorbent core (231) The end is connected with the middle part of the third flow-guiding liquid-absorbent core (24); and/or,

The at least one return wick (23) includes a second return wick (232), and the second return wick (232) is located on one side of the casing (1) along the second direction, so The side of the backflow liquid-absorbent core (23) away from the side of the housing (1) is provided with the second flow-guiding liquid-absorbent core (22); the second return-flow liquid-absorbent core (232) The two ends are connected with one end of the third flow-guiding liquid-absorbing core (24).
The heat dissipation device according to claim 8, characterized in that, the at least one return wick (23) comprises third return wicks respectively located on both sides of the casing (1) along the second direction. Liquid core (233) and the 4th backflow liquid suction core (234); The second flow guide liquid suction core (22) is positioned at the 3rd return flow suction core (233) and the 4th return flow suction core ( 234); between the first end (D1) of the second flow-guiding liquid-absorbing core (22) and the first flow-guiding liquid-absorbing core (21), there is a space along the first direction;

The two ends of the first flow-guiding liquid-absorbing core (21) along the second direction are respectively connected to the respective first ends of the third returning liquid-absorbing core (233) and the fourth returning liquid-absorbing core (234). end connection; the two ends of the third flow-guiding liquid-absorbent core (24) along the second direction are respectively connected with the third return liquid-absorbent core (233) and the fourth return-flow liquid-absorbent core (234) The second end connection.
The heat dissipation device according to claim 8, characterized in that, the inner space of the housing (1) includes a first evaporation zone (a1) and a first condensation zone (b1) arranged along a first direction and along the The second evaporation area (a2) and the second condensation area (b2) arranged in the first direction, the first evaporation area (a1) and the second condensation area (b2) are arranged side by side and located in the housing (1 ) of the first end along the first direction; the first condensation area (b1) and the second evaporation area (a2) are arranged side by side and located at the second end of the housing (1) along the first direction ; the second guide liquid-absorbent core (22) of the first condensation zone (b1) and the first guide liquid-absorbent core (21) of the second evaporation zone (a2) and the first evaporation zone ( A space is provided between the first flow-guiding liquid-absorbing core (21) of a1) and the first flow-guiding liquid-absorbing core (21) of the second condensation zone (b2);

The at least one return wick (23) includes a fifth return wick (235) and a sixth return wick (236), and the fifth return wick (235) is located in the casing (1 ), the sixth return wick (236) is located on the second side of the housing (1) along the second direction, the fifth return wick The liquid wick (235) connects the first flow-guiding liquid-absorbent wick (21) of the first evaporation zone (a1) and the third flow-guiding liquid-absorbent wick (24) of the first condensation zone (b1), and the sixth The return-flow absorbent core (236) connects the first flow-guiding liquid-absorbent core (21) in the second evaporation zone (a2) and the third flow-guiding liquid-wick (24) in the second condensation zone (b2).
The heat dissipation device according to claim 11, characterized in that:

In the first condensation zone (b1), the length of the second flow-guiding liquid-absorbing core (22) decreases along the direction from the first evaporation zone (a1) to the second evaporation zone (a2);

In the second condensation zone (b2), the length of the second flow-guiding liquid-absorbing wick (22) increases along the direction from the first evaporation zone (a1) to the second evaporation zone (a2).
The heat dissipation device according to claim 7, characterized in that, the at least one return liquid absorbing core (23) comprises more than two return liquid absorbing cores (23) located in the middle of the casing (1) along the second direction ), the second direction is perpendicular to the thickness direction of the housing (1) and is set at an angle to the first direction, and the second end of each of the return wicks (23) is provided with the The third flow-guiding liquid-absorbing core (24), and the third flow-guiding liquid-absorbing core (24) at the second end of the different backflow liquid-absorbing core (23) is arranged at intervals, and the third flow-guiding liquid-absorbing core (24) ) width is greater than the width of the return liquid-absorbent core (23), and each third flow-guiding liquid-absorbing core (24) is connected to at least part of the second flow-guiding liquid-absorbing core (22).
The heat dissipation device according to claim 7, characterized in that, the condensation area (b) expands outward along the direction from close to the evaporation area (a) to away from the evaporation area (a), and the backflow suction liquid The core (23) extends along the first direction and is located on one side of the evaporation zone (a) along the second direction, the second direction is perpendicular to the thickness direction of the shell (1), and is in line with the The first direction is set at an angle, and one end of the third flow-guiding liquid-absorbent core (24) is connected to the second end of the return liquid-absorbent core (23) near the evaporation area (a), and the The other end of the third flow-guiding liquid-absorbent wick (24) extends along a direction away from the evaporation zone (a) and the return flow-absorbent core (23), and the second flow-guiding liquid-absorbent core (22) extends from the The third flow-guiding liquid-absorbing core (24) extends along the direction away from the evaporation area (a) and bends toward the return-flow liquid-absorbing core (23), and the first flow-guiding liquid-absorbing core (22) The two ends (D2) are closer to the evaporation zone (a) relative to the first end (D1) of the second flow-guiding liquid-absorbing core (22).
The heat dissipation device according to any one of claims 1-14, characterized in that, the first flow-guiding liquid-absorbing core (21) comprises a plate-shaped main body (211), and the first flow-guiding liquid-absorbing core (21) One side along the thickness direction is in contact with the side wall of the housing (1), and the first guide fluid-absorbing core (21) is in contact with the housing on the other side along the thickness direction (1) The side walls are set at intervals.
The heat dissipation device according to claim 15, characterized in that, the first flow-guiding liquid-absorbent core (21) further comprises a plurality of branch parts (212) arranged at intervals, each of the branch parts (212) along the Both sides in the thickness direction are respectively connected with the plate-shaped main body (211) and the side wall of the housing (1), and the return liquid absorbent core (23) is connected with the plate-shaped main body (211) and the multiple At least one of the branch portions (212) is connected.
The heat dissipation device according to any one of claims 1-14, characterized in that, the first flow-guiding liquid-absorbing core (21) comprises a rod-shaped flow-guiding portion (213), and the rod-shaped flow-guiding portion ( 213) The end close to the condensation zone (b) along the first direction is connected to the first end of the return wick (23).
The heat dissipation device according to claim 17, characterized in that:

Both sides of the rod-shaped air guide part (213) along the thickness direction are respectively in contact with the side walls of the housing (1); or,

One side of the rod-shaped flow guide part (213) along the thickness direction is in contact with the side wall of the housing (1), and the other side of the rod-shaped flow guide part (213) along the thickness direction is in contact with the side wall of the housing (1). The side walls of the casing (1) are arranged at intervals.
The heat dissipation device according to claim 17 or 18, characterized in that, the first flow-guiding liquid-absorbing core (21) further comprises a plurality of branch flow-guiding parts (214) arranged side by side and at intervals, and each branch flow-guiding part (214) The part (214) extends along the direction away from the rod-shaped guide part (213), wherein:

The rod-shaped flow guide part (213) is linear and extends along the first direction, and the plurality of branch flow guide parts (214) are arranged on the rod-shaped flow guide part (213) facing along the extending direction. the sides of said steam; or,

The rod-shaped deflector (213) is L-shaped, the first side of the L-shaped is connected to the return absorbent core (23), and the plurality of branch deflectors (214) are arranged on the On the first side or the second side of the L-shape and facing the inner side of the L-shape.
The heat sink according to claim 19, wherein:

Both sides of each branch guide portion (214) along the thickness direction are respectively in contact with the side wall of the housing (1); or,

One side of each branch guide part (214) is in contact with the side wall of the housing (1) along the thickness direction, and the other side of each branch guide part (214) is along the thickness direction It is spaced apart from the side wall of the casing (1).
The heat dissipation device according to any one of claims 1-20, characterized in that, the casing (1) is provided with an air suction port (H), and the air suction port (H) corresponds to the evaporation area (a ) and one of said condensation zone (b), wherein:

The suction port (H) is in direct communication with one of the evaporation zone (a) and the condensation zone (b); or,

The liquid-absorbent wick structure (2) at one of the evaporation area (a) and the condensation area (b) is provided with a through opening (K), and the air suction port (H) passes through the through opening (K). An opening (K) communicates with one of said evaporation zone (a) and said condensation zone (b).
The heat dissipation device according to any one of claims 1-21, characterized in that:

Both sides of the backflow absorbent core (23) along the thickness direction are respectively in contact with the side walls of the housing (1); or,

One side of the return liquid-absorbent core (23) along the thickness direction is in contact with the side wall of the housing (1), and the other side of the return liquid-absorbent core (23) along the thickness direction It is spaced apart from the side wall of the casing (1).
The heat dissipation device according to any one of claims 1-22, characterized in that, the heat dissipation device further comprises a spacer (3), and the spacer (3) is arranged on each return wick (23) The side facing the steam, the two sides of the spacer (3) along the thickness direction are respectively in contact with the side wall of the housing (1); wherein:

The backflow liquid-absorbing core (23) is located in the middle of the housing (1), and the spacers (3) are respectively provided on both sides of the return-flow liquid-absorbing core (23); or,

The backflow liquid-absorbing core (23) is located on one side of the casing (1), and the side of the backflow liquid-absorbing core (23) away from the side of the casing (1) is provided with the spacer (3 ).
The heat dissipation device according to claim 23, characterized in that:

The spacer (3) is integrally formed or separately formed with the side wall of the casing (1) on one side along the thickness direction; and/or,

The spacer (3) is an integral structure or the spacer (3) includes a plurality of segments arranged at intervals along the extending direction of the backflow absorbent core (23).
The heat dissipation device according to any one of claims 1-24, characterized in that, the liquid-absorbing core structure (2) adopts a capillary structure; the formation method of the capillary structure includes at least one of the following: weaving, sintering, Etching and plating.
An electronic device, characterized in that it comprises:

The heat dissipation device according to any one of claims 1-25;

The heating device is arranged in contact with the shell (1) of the heat sink corresponding to the evaporation area (a) of the heat sink.