CN114727546B

CN114727546B - Heat abstractor and electronic equipment

Info

Publication number: CN114727546B
Application number: CN202210170970.0A
Authority: CN
Inventors: 骆洋; 刘用鹿; 陈丘; 靳林芳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2023-04-28
Anticipated expiration: 2042-02-23
Also published as: WO2023160109A1; CN114727546A

Abstract

The embodiment of the application provides a heat dissipation device and electronic equipment. The heat dissipation device comprises a shell and a fluid working medium, wherein the shell comprises an evaporation area and a condensation area, and the evaporation area is arranged at the heating device so that the fluid working medium forms steam and flows to the condensation area; the liquid suction core structure is arranged in the shell, forms a steam flow channel in the shell, comprises a first guide liquid suction core, a second guide liquid suction core and a backflow liquid suction core, and is positioned in the evaporation area; the first end of the second diversion liquid suction core is suspended in the air and is positioned in the condensation area or extends to the evaporation area, and the second end of the second diversion liquid suction core is positioned in the condensation area; the reflux liquid suction core is connected with the second end of the second diversion liquid suction core and the first diversion liquid suction core; the first end of the second flow-directing wick is adjacent the evaporation zone along the vapor flow path relative to the second end of the second flow-directing wick. This application realizes that steam and liquid syntropy flow, avoids reverse flow's steam to carry liquid and makes liquid be detained the condensation zone, helps returning liquid to evaporation zone, prevents to appear burning out, has improved the reliability.

Description

Heat abstractor and electronic equipment

Technical Field

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

Background

In terminal equipment such as mobile phones, flat plates, notebooks, PCs, large screens and the like, the heating power of electronic devices is gradually increased along with iteration of products, however, the overall size and thickness of the equipment are developed towards compact and small directions, so that heat is accumulated in the equipment and cannot be timely dissipated, the temperature of the equipment is increased, the user experience is affected, and the devices are possibly damaged at high temperature. Therefore, various efficient heat dissipation schemes are needed to solve the problem of heat dissipation of the terminal device.

A Vapor Chamber (VC) is a vacuum cavity with a micro-nano wick structure inside and injected with a fluid working medium, and is widely used for heat dissipation of electronic products. Specifically, the fluid working medium in the temperature equalization plate can absorb heat at the small-area heat source to form steam, so that the steam is quickly conducted to the large-area heat dissipation surface to achieve the purpose of efficient heat dissipation, and the steam can flow back to the heat source by utilizing the capillary force of the liquid absorption core structure after being condensed into liquid, and evaporation and heat absorption are performed again.

In the existing temperature equalization plate, the flow direction of steam is opposite to the flow direction of liquid in the liquid suction core structure, and the reversely flowing steam possibly carries condensation liquid drops, so that the condensation liquid drops are retained in a condensation area, liquid return to an evaporation area is not facilitated to be supplemented, the condition of drying easily occurs, and reliable heat transfer circulation cannot be formed.

Disclosure of Invention

The embodiment of the application provides a heat abstractor and electronic equipment, realizes that steam and liquid co-current flow, avoids reverse flow's steam to carry liquid and makes liquid be detained the condensation zone, helps returning liquid to evaporation zone, can prevent to appear burning-out the condition, has improved product reliability.

For this purpose, the following technical solutions are adopted in the embodiments of the present application:

in a first aspect, embodiments of the present application provide a heat dissipating device, including: the device comprises a shell and a fluid working medium accommodated in the shell, wherein the inner space of the shell comprises at least one group of evaporation areas and condensation areas which are arranged along a first direction, the first direction is perpendicular to the thickness direction of the shell, and the evaporation areas are used for being arranged at a heating device so that the fluid working medium at the evaporation areas forms steam and flows towards the condensation areas; the liquid suction core structure is arranged in the shell and forms a steam flow channel in the shell, and comprises a first diversion liquid suction core, a second diversion liquid suction core and at least one backflow liquid suction core, wherein the first diversion liquid suction core is positioned in the evaporation area, the first end of the second diversion liquid suction core is arranged in a suspending mode, the second end of the second diversion liquid suction core is positioned in the condensation area, the first end of the backflow liquid suction core is connected with the first diversion liquid suction core, and the second end of the backflow liquid suction core is connected with the second end of the second diversion liquid suction core; the steam flow channel comprises a first part adjacent to the second diversion liquid suction core, the extending direction from the first end of the second diversion liquid suction core to the second end of the second diversion liquid suction core is consistent with the extending direction of the first part of the steam flow channel, and the first end of the second diversion liquid suction core is close to the evaporation area relative to the second end of the second diversion liquid suction core along the extending direction of the steam flow channel.

According to the heat dissipation device, the first end of the second diversion liquid suction core is contacted with steam firstly, so that the flowing direction of part of steam in the space of the condensation area is from the first end of the second diversion liquid suction core to the second end of the second diversion liquid suction core, the other part of steam in the steam is condensed into liquid in the condensation area, and flows back to the evaporation area through the first end of the second diversion liquid suction core, the second end of the backflow liquid suction core and the first end of the backflow liquid suction core in sequence, the same-direction flowing of the steam and the liquid is realized, the phenomenon that the reversely flowing steam carries the liquid to enable the liquid to stay in the condensation area is avoided, the backflow liquid is facilitated to the evaporation area, the burning-out condition is effectively prevented, and the reliability of products is improved.

In one possible implementation, the first end of the second flow-directing wick extends to the evaporation zone, one end of the first portion of the vapor flow channel communicates with the evaporation zone, and the other end of the first portion of the vapor flow channel extends to the second end of the return wick; or, the first end of the second diversion liquid suction core is located in the condensation area, the steam flow channel further comprises a second part, one end of the second part of the steam flow channel is communicated with the evaporation area, the other end of the second part of the steam flow channel is communicated with one end of the first part of the steam flow channel and the first end of the second diversion liquid suction core, and the other end of the first part of the steam flow channel extends to the second end of the backflow liquid suction core. That is, in this implementation, the first end of the second flow-directing wick extends to the evaporation zone, and the vapor flow channel may include only the first portion; the first end of the second flow-directing wick is positioned in the condensation zone and the vapor flow passage can include a first portion and a second portion.

In one possible implementation, the first portion of the vapor flow channel includes at least one of a first spacing space between the backflow wick and the second flow-directing wick and a second spacing space between the housing and the second flow-directing wick; and/or the second portion of the vapor flow channel comprises at least one of a first spaced region between the first flow-directing wick and the housing and a second spaced region at a side of the backflow wick facing the vapor.

In one possible implementation manner, the second diversion liquid suction core comprises a plurality of sub liquid suction cores which are arranged at intervals, the second ends of the sub liquid suction cores are connected with the backflow liquid suction cores respectively, the first ends of the sub liquid suction cores are arranged in a suspending mode, and the first part of the steam flow channel comprises a third interval space between the adjacent sub liquid suction cores. That is, in this implementation, one solution of the second flow-guiding wick includes a plurality of sub-wicks disposed at intervals, and the plurality of sub-wicks may be disposed side by side or may extend in different directions, respectively.

In one possible implementation, each of the sub-wicks is in contact with a sidewall of the housing on both sides in the thickness direction; or, one side of each sub-wick in the thickness direction is in contact with the side wall of the housing, and the other side of each sub-wick in the thickness direction is arranged at intervals from the side wall of the housing so as to form a second interval space of the steam flow channel. That is, in this implementation, a plurality of sub-wicks may be in a parallel architecture, i.e., each sub-wick is in contact with the side wall of the housing on both sides in the thickness direction, respectively; alternatively, the plurality of sub-wicks may be configured in a serial manner, that is, each sub-wick is in contact with the side wall of the housing on one side in the thickness direction, and is disposed at a distance from the side wall of the housing on the other side.

In one possible implementation manner, the second diversion liquid suction core is of a plate-shaped structure, one side of the second diversion liquid suction core along the thickness direction is in contact with the side wall of the shell, and the other side of the second diversion liquid suction core along the thickness direction is arranged at intervals with the side wall of the shell so as to form a second interval space of the steam flow channel. That is, in this implementation, another approach to the second flow-directing wick is to employ a plate-like structure. Because the plate-shaped structure generally occupies a larger space of the condensation area, in order to ensure that steam can flow to the end part of the condensation area far away from the evaporation area so as to be condensed into liquid as soon as possible, the second diversion liquid suction core can be selected to be in a serial structure, namely, the other side of the second diversion liquid suction core along the thickness direction is arranged at intervals with the side wall of the shell, so that the space for steam to flow can be reserved.

In one possible implementation, the wick structure further comprises: the third diversion liquid suction core is positioned in the condensation area and connected with the second end of the second diversion liquid suction core and the backflow liquid suction core, and the third diversion liquid suction core is used for guiding liquid in the second diversion liquid suction core into the backflow liquid suction core. That is, in this implementation, to facilitate connection of the second flow-directing wick with the return wick, a third flow-directing wick may be disposed between the second flow-directing wick and the return wick, and the third flow-directing wick may function to pool liquid in the second flow-directing wick so as to direct liquid in the second flow-directing wick into the return wick.

In one possible implementation, in a set of evaporation and condensation zones arranged along the first direction, the third flow-directing wick extends along a second direction that is perpendicular to the thickness direction of the housing and is disposed at an angle to the first direction, the second flow-directing wick extends from the third flow-directing wick toward the evaporation zone, and a first end of the second flow-directing wick is proximate to the evaporation zone relative to a second end of the second flow-directing wick. That is, in this implementation manner, the extension direction of the third flow-guiding wick may be selected in cooperation with the extension direction of the second flow-guiding wick, where the third flow-guiding wick extends in the second direction, such as the width direction of the housing, and the second flow-guiding wick may extend in the first direction, such as the length direction of the housing, so that, compared to the parallel-structure wick design scheme in which the gas and liquid flow reversely, the gas flow path of the steam channel may be shortened, the flow resistance may be reduced, and the temperature uniformity may be better.

In a possible implementation manner, the at least one backflow liquid suction core comprises one or more than two first backflow liquid suction cores, the first backflow liquid suction cores are located in the middle of the shell along the second direction, and the second diversion liquid suction cores are respectively arranged on two sides of the first backflow liquid suction cores; the second end of the first backflow liquid suction core is connected with the middle part of the third diversion liquid suction core; and/or the at least one backflow wick comprises a second backflow wick, the second backflow wick is located on one side of the shell along the second direction, and the second diversion wick is arranged on the side surface of the backflow wick, which is far away from the shell; and the second end of the second backflow liquid suction core is connected with one end of the third diversion liquid suction core. That is, in this implementation, the number of backflow wicks may be one, or two, or more, and may be selected based on the amount of liquid backflow. The backflow liquid suction core can be positioned in the middle of the shell along the second direction and can be connected with the middle of the third diversion liquid suction core at the moment; alternatively, the return wick may be located on a side of the housing in the second direction, and may be connected to an end of the third flow-directing wick.

In one possible implementation, the at least one backflow wick comprises a third backflow wick and a fourth backflow wick, respectively, located on both sides of the housing in the second direction; the second diversion liquid suction core is positioned between the third backflow liquid suction core and the fourth backflow liquid suction core; a spacing space is arranged between the first end of the second diversion liquid suction core and the first diversion liquid suction core along the first direction; the two ends of the first diversion liquid suction core along the second direction are respectively connected with the first ends of the third backflow liquid suction core and the fourth backflow liquid suction core; and two ends of the third diversion liquid suction core along the second direction are respectively connected with respective second ends of the third backflow liquid suction core and the fourth backflow liquid suction core. That is, in this implementation, the number of the backflow wicks may be two, and the backflow wicks are respectively located at two sides of the housing along the second direction, the vapor flows from the evaporation area to the condensation area between the two backflow wicks, and since the first end suspended by the second diversion wick contacts the vapor first, the liquid after vapor condensation moves from the first end to the second end in the second diversion wick, and the flow direction of the liquid is the same as that of the vapor.

In one possible implementation, the interior space of the housing includes a first evaporation zone and a first condensation zone aligned along a first direction and a second evaporation zone and a second condensation zone aligned along the first direction, the first evaporation zone and the second condensation zone being disposed side-by-side and at a first end of the housing along the first direction; the first condensation zone and the second evaporation zone are arranged side by side and are positioned at the second end of the shell along the first direction; a spacing space is arranged between the second diversion liquid suction core of the first condensation area and the first diversion liquid suction core of the second evaporation area and the first diversion liquid suction core of the first evaporation area and the first diversion liquid suction core of the second condensation area; the at least one backflow liquid suction core comprises a fifth backflow liquid suction core and a sixth backflow liquid suction core, the fifth backflow liquid suction core is located on a first side of the shell along the second direction, the sixth backflow liquid suction core is located on a second side of the shell along the second direction, the fifth backflow liquid suction core is connected with the first diversion liquid suction core of the first evaporation zone and the third diversion liquid suction core of the first condensation zone, and the sixth backflow liquid suction core is connected with the first diversion liquid suction core of the second evaporation zone and the third diversion liquid suction core of the second condensation zone. That is, in this implementation, the inner space of the case may be provided with a first set of evaporation and condensation regions, i.e., a first evaporation region and a first condensation region, and may be further provided with a second set of evaporation and condensation regions, i.e., a second evaporation region and a second condensation region, the first evaporation region may correspond to the first heat generating device, and the second evaporation region may correspond to the second heat generating device, which may be suitable for a scenario of a plurality of heat generating devices.

In one possible implementation, in the first condensation zone, the second flow-directing wick decreases in length in a direction from the first evaporation zone to the second evaporation zone; in the second condensation region, the second diversion wick increases in length along the direction from the first evaporation region to the second evaporation region. That is, in this implementation, the first end of the second flow-directing wick of the first condensation zone forms an inclined structure, and the first end of the second flow-directing wick of the second condensation zone forms an inclined structure, which may be disposed in parallel and spaced apart to form a spacing space.

In one possible implementation, the at least one backflow wick includes two or more backflow wicks located in the middle of the casing along a second direction, the second direction being perpendicular to the thickness direction of the casing and being set at an angle to the first direction, the second end of each backflow wick being provided with a third flow-guiding wick, and third flow-guiding wicks at the second ends of different backflow wicks being set at intervals, the width of the third flow-guiding wick being greater than the width of the backflow wick, each third flow-guiding wick being connected to at least part of the second flow-guiding wick. That is, in this implementation, a plurality of backflow wicks may be disposed at a middle portion of the housing in the second direction, one third flow-guiding wick may be disposed at the second end of the backflow wick, and the third flow-guiding wicks at the second ends of the different backflow wicks may be disposed at intervals so as to connect the second flow-guiding wicks at the different positions, so that the liquid in the second flow-guiding wicks at the different positions may enter the corresponding backflow wicks through the connected third flow-guiding wicks, respectively.

In one possible implementation manner, the condensation zone extends in a direction from the evaporation zone to a direction away from the evaporation zone, the backflow wick extends in the first direction and is located at one side of the evaporation zone in a 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 diversion wick is connected with a portion, close to the evaporation zone, of the second end of the backflow wick, the other end of the third diversion wick extends in a direction away from the evaporation zone and the backflow wick, the second diversion wick extends from the third diversion wick in a direction away from the evaporation zone and is bent towards the backflow wick, and the second end of the second diversion wick is close to the evaporation zone relative to the first end of the second diversion wick. That is, in this implementation, if the width of the condensation zone is greater than the evaporation zone, the shape of the third flow-directing wick may be deformed according to the shape of the condensation zone, e.g., the return wick extends in the first direction, the third flow-directing wick extends in a direction away from the evaporation zone and the return wick, and the shape of the second flow-directing wick may also be deformed according to the shape of the condensation zone, e.g., the shape of the second flow-directing wick may be arcuate.

In one possible implementation manner, the first diversion liquid suction core comprises a plate-shaped main body, one side of the first diversion liquid suction core along the thickness direction is in contact with the side wall of the shell, and the other side of the first diversion liquid suction core along the thickness direction is arranged at intervals with the side wall of the shell. That is, in this implementation, one solution of the first flow-guiding wick includes a plate-shaped body, and since the area of the plate-shaped body is generally large, the first flow-guiding wick may adopt a serial structure, that is, one side of the first flow-guiding wick in the thickness direction contacts the side wall of the housing, and the other side is spaced from the side wall of the housing, so as to form a space for the vapor in the evaporation zone to flow.

In one possible implementation manner, the first diversion liquid suction core further comprises a plurality of branch parts which are arranged at intervals, two sides of each branch part along the thickness direction are respectively connected with the plate-shaped main body and the side wall of the shell, and the backflow liquid suction core is connected with at least one of the plate-shaped main body and the plurality of branch parts. That is, in this implementation, the first diversion liquid absorption core includes a plate-shaped main body and a plurality of branch parts, and a scheme of combining serial and parallel can be adopted, so that the area of the first diversion liquid absorption core can be increased, and the liquid in the first diversion liquid absorption core can absorb heat as soon as possible to form steam.

In one possible implementation, the first flow-directing wick comprises a rod-shaped flow-directing portion connected to the first end of the return wick along the first direction near the end of the condensation zone. That is, in this implementation, another approach to the first flow-directing wick is to include a rod-shaped flow-directing portion. The shape of the rod-shaped flow guide part can be flexibly selected according to the extending direction of the backflow liquid suction core and the space shape of the evaporation area, and is for example linear, L-shaped or U-shaped.

In one possible implementation manner, two sides of the rod-shaped flow guiding part along the thickness direction are respectively contacted with the side wall of the shell; or, one side of the rod-shaped flow guiding part along the thickness direction is contacted with the side wall of the shell, and the other side of the rod-shaped flow guiding part along the thickness direction is arranged at intervals with the side wall of the shell. That is, in this implementation, the rod-shaped flow guiding portion may be a parallel architecture or a serial architecture.

In one possible implementation, the first diversion wick further includes a plurality of branch diversion portions arranged side by side and at intervals, each branch diversion portion extending in a direction away from the rod-shaped diversion portion, wherein: the rod-shaped flow guide part is linear and extends along the first direction, and the plurality of branch flow guide parts are arranged on the side surface of the rod-shaped flow guide part, which faces the steam along the extending direction; or, the rod-shaped flow guide part is L-shaped, a first edge of the L-shaped flow guide part is connected with the backflow liquid suction core, and the plurality of branch flow guide parts are arranged on the first edge or the second edge of the L-shaped flow guide part and face to the inner side of the L-shaped flow guide part. That is, in this implementation, still another solution of the first guiding wick includes a rod-shaped guiding portion and a plurality of branched guiding portions, which may be disposed at one side or both sides of the rod-shaped guiding portion according to the shape and position of the rod-shaped guiding portion.

In one possible implementation manner, two sides of each branch flow guiding part along the thickness direction are respectively contacted with the side wall of the shell; or, each branch flow guiding part contacts with the side wall of the shell along one side of the thickness direction, and the other side of each branch flow guiding part is arranged at intervals with the side wall of the shell along the thickness direction. That is, in this implementation, the branch guide may be a parallel architecture or a serial architecture.

In one possible implementation, an extraction opening is provided on the housing, the extraction opening corresponding to one of the evaporation zone and the condensation zone, wherein: the extraction opening is directly communicated with one of the evaporation zone and the condensation zone; or, a through opening is arranged on the liquid suction core structure at one of the evaporation area and the condensation area, and the air extraction opening is communicated with one of the evaporation area and the condensation area through the through opening. That is, in this implementation, the heat sink is a vacuum chamber, and an extraction port may be provided in the housing to extract air from the evaporation zone and the condensation zone. And if the liquid suction core structure forms a closed structure in the shell, and the closed structure adopts a parallel framework, a through opening can be arranged on the closed structure at the moment so as to be communicated with the air extraction opening on the shell, and then the evaporation area and the condensation area are extracted through the air extraction opening. It will be appreciated that if the enclosure structure is a serial structure, the through opening may not be provided any more, and the air extraction opening on the housing may be directly connected to one of the evaporation area and the condensation area.

In one possible implementation, two sides of the reflow wick in the thickness direction are respectively in contact with the side walls of the housing; or, one side of the reflow liquid suction core along the thickness direction is in contact with the side wall of the shell, and the other side of the reflow liquid suction core along the thickness direction is arranged at intervals with the side wall of the shell. That is, in this implementation, the reflow wick may be a parallel architecture or a serial architecture.

In one possible implementation, the heat dissipation device further includes a spacer disposed on a side of each of the backflow wicks facing the vapor, and both sides of the spacer in the thickness direction are respectively in contact with the side walls of the case; wherein: the backflow liquid suction core is positioned in the middle of the shell, and the isolating pieces are respectively arranged on two sides of the backflow liquid suction core; or, the backflow wick is located at one side of the shell, and the side surface of the backflow wick, which is far away from the side of the shell, is provided with the separator. That is, in this implementation, since the flow direction of the liquid in the backflow wick is opposite to the flow direction of the vapor in the internal space/cavity of the housing, in order to avoid that the liquid stays in the condensation area due to the vapor flowing reversely carrying the liquid in the backflow wick, the liquid is not beneficial to the liquid returning to the evaporation area for supplementing, and a spacer may be disposed on the side surface of the backflow wick facing the vapor.

In one possible implementation, the spacer is integrally formed or separately formed with a side wall of one side of the housing in the thickness direction; and/or the separator is a unitary structure or comprises a plurality of segments spaced apart along the extension of the return wick. That is, in this embodiment, in order to simplify the installation process, the spacer is integrally formed with a side wall of one side of the housing in the thickness direction, such as an upper cover plate or a lower cover plate of the housing, and the spacer is of an integral structure; in order to reduce the installation difficulty, the spacer may be formed separately from the housing, and the spacer may include a plurality of segments.

In one possible implementation, the wick structure employs a capillary structure; the capillary structure is formed in at least one of the following ways: braiding, sintering, etching and electroplating. That is, in this implementation, the material of the capillary structure may include at least one of a woven material, a sintered material, an etched material, and an electroplated material; in addition, the specific structure of the capillary structure may include a plurality of groove structures and a plurality of protrusion structures, which may be formed by etching, for example.

In a second aspect, an embodiment of the present application provides an electronic device, including: the heat dissipating device provided in the first aspect; and the heating device is arranged in contact with the shell of the heat dissipation device corresponding to the evaporation area of the heat dissipation device.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The drawings that accompany the detailed description can be briefly described as follows.

Fig. 1A is a schematic structural diagram of a wick structure employing a temperature equalization plate of a serial architecture;

FIG. 1B is a schematic illustration of an exemplary specific configuration of the isopipe of FIG. 1A;

fig. 2A is a schematic structural diagram of a temperature equalization plate with a wick structure employing a parallel architecture;

FIG. 2B is a schematic illustration of an exemplary embodiment of the isopipe of FIG. 2A;

fig. 3A is a schematic top view of a heat dissipating device according to a first embodiment of the present disclosure with an upper cover removed;

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

fig. 4A is a schematic top view of a heat dissipating device according to a second embodiment of the present disclosure after an upper cover is removed;

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

FIG. 5A is a schematic top view of a variation of the heat dissipating device shown in FIG. 4A;

FIG. 5B is a schematic cross-sectional view of the heat dissipating device shown in FIG. 5A at line A-A and line B-B;

FIG. 6A is a schematic top view of a variation of the heat dissipating device shown in FIG. 5A;

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

FIG. 7 is a schematic top view of a variation of the heat dissipating device shown in FIG. 6A;

fig. 8A is a schematic top view of a heat dissipating device according to a third embodiment of the present disclosure with an upper cover removed;

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

fig. 9A is a schematic top view of a heat dissipating device according to a fourth embodiment of the present disclosure with an upper cover removed;

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

fig. 10 is a schematic top view of a heat dissipating device according to a fifth embodiment of the present disclosure with an upper cover removed;

fig. 11 is a schematic top view of a heat dissipating device according to a sixth embodiment of the present disclosure with an upper cover removed;

fig. 12 is a schematic top view of a heat dissipating device with an upper cover removed.

Detailed Description

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 the present application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or an contradictory or integral connection; the two components can be connected indirectly through a third component; the specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

The heat of the small-area heat source is quickly conducted to the large-area heat radiating surface by the temperature equalizing plate, so that the purpose of high-efficiency heat radiation is achieved. The working mechanism is characterized in that the characteristics of boiling heat absorption and condensation heat release of the fluid working medium are utilized, and the effect of rapidly conveying heat of a hot end to a cold end through steam flow is realized.

The temperature equalizing plate mainly comprises a shell, a liquid suction core such as a capillary structure, a fluid working medium and the like. The liquid in the liquid suction core absorbs heat, and vapor generated by evaporation and boiling enters the cavity; the gas flows in the cavity to a cooler condensation zone to give off heat, condenses into droplets, and the liquid is reabsorbed by the wick and flows to the evaporation zone under the action of capillary forces. That is, the evaporation zone is the area where the heat source is attached to the heat dissipating device, such as a temperature equalizing plate, and absorbs heat from the heat source, causing the internal liquid working medium to evaporate into a gas and enter the cavity channel. The condensing area is a large heat-dissipating area of a heat-dissipating device such as a temperature-equalizing plate, gas in a cavity in the condensing area condenses to release heat, and condensed liquid is absorbed by a liquid absorption core structure such as a capillary structure.

Wherein the housing may include an upper cover plate and a lower cover plate. The wick structure in the temperature equalization plate may be classified into a serial structure and a parallel structure according to whether the wick structure such as a capillary directly abuts against the inner surfaces of the upper and lower cover plates, respectively.

Fig. 1A is a schematic structural diagram of a wick structure employing a temperature equalization plate of a serial architecture. As shown in fig. 1A, in the serial architecture, the wick, i.e., the capillary, is not simultaneously attached to the inner surfaces of the respective upper and lower cover plates, and a cavity is left between the capillary and the cover plates through which vapor passes.

Fig. 1B is a schematic illustration of an exemplary specific structure of the temperature uniformity plate shown in fig. 1A. As shown in fig. 1B, the fluid working medium (not shown) at the hot end absorbs heat, forms a gas, and moves in the upper cavity toward the cold end, where the gas condenses to release heat, forms a liquid into a capillary, and moves toward the hot end under the force of the capillary to re-evaporate and absorb heat. It can be seen that the direction of gas flow in the cavity is from the hot end to the cold end; the flow direction of the liquid in the capillary is from cold end to hot end, namely the flow directions of the gas and the liquid are opposite.

Fig. 2A is a schematic structural diagram of a temperature equalization plate with a wick structure employing a parallel architecture. As shown in fig. 2A, in a parallel architecture, multiple wicks, i.e., capillaries, may be included that are directly supported in close proximity to the respective inner surfaces of the upper and lower cover plates, with liquids and gases within the capillaries being accessible only through the sides. At this time, the capillary may play a role in supporting the upper and lower cover plates.

Fig. 2B is a schematic illustration of an exemplary specific structure of the temperature uniformity plate shown in fig. 2A. In fig. 2B, the left side view is a top view of the temperature equalization plate with the upper cover plate removed; the right side view is a cross-sectional view of the left side view at line A-A and line B-B. As shown in fig. 2B, one end of each 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, and each of the capillaries contacts with the upper cover plate and the lower cover plate along two sides of the thickness direction, namely, a parallel structure. The fluid working medium (not shown) at the hot end moves towards the cold end in the space between adjacent capillaries after absorbing heat, enters the other end of the capillary after condensing into liquid at the cold end, and moves towards the hot end under the action of capillary force.

Because the wick structure, i.e. the two sides of the capillary are respectively abutted against the inner surfaces of the upper cover plate and the lower cover plate, the fluid working medium in the capillary can only evaporate from the side surface of the capillary, so that the evaporation area is smaller. When the power consumption is increased, the evaporation thermal resistance and the vapor circulation pressure drop are larger, so that the temperature uniformity of the temperature uniformity plate is poorer. And, the flow direction of the liquid in the capillaries (see section A-A) is opposite to the flow direction of the vapor/gas in the space between adjacent capillaries (see section B-B).

With the development of ultrathin terminal electronic equipment, the thickness of the design of the temperature equalization plate is smaller and smaller. Conventional serial wick structure designs will simultaneously compress the thicknesses of the wick and vapor cavity as the thickness is reduced, resulting in a significant increase in gas and liquid flow resistance of the vapor plate. Although the parallel structure produces bigger wick and vapor cavity thickness space than the serial structure, the smaller cross-sectional area of the wick structure makes the liquid return amount less, and the bigger vapor cavity channel width makes the vapor or condensed liquid difficult to contact the wick, thereby being unfavorable for the liquid return of the wick, and leading to easy occurrence of burn-out. In addition, the larger pressure difference in the steam cavity can also cause the theoretical maximum temperature difference value of the temperature equalizing plate to be increased. Specifically, the pressure drop of the vapor flow within the vapor chamber is proportional to the length of the channel and inversely proportional to the cross-sectional area of the channel. The conventional wick design with parallel structure easily causes the long length of the steam cavity channel and the excessively high pressure drop, so that the saturation temperature difference of steam is increased, and the temperature uniformity of the temperature uniformity plate is reduced.

In addition, the conventional serial and parallel liquid suction core structure design, the steam in the internal cavity is contacted with the liquid in the liquid suction core, the flow direction of the gas in the cavity is opposite to the flow direction of the liquid in the liquid suction core structure, the liquid drops can be carried by the reverse flow, namely, the liquid on the surface of the liquid suction core structure can be carried by the gas flowing at high speed, so that the condensed liquid drops are retained in the condensation area, the liquid return to the evaporation area is not facilitated, the liquid return in the evaporation area is not timely, the burning dry is easy to occur, and the temperature equalization plate is invalid. Therefore, special wick and steam cavity channel structures are required to be designed, so that phase change transportation of gas and liquid is promoted, and reliable heat and mass transfer circulation is formed.

In view of this, the embodiment of the application provides a heat dissipating device and an electronic device. The electronic equipment comprises a heating device and a heat dissipation device. The heating device is arranged in contact with the shell of the heat dissipation device corresponding to the evaporation area of the heat dissipation device. In this embodiment of the present application, the "contact" may be a direct contact or an indirect contact, for example, other components, such as an adhesive layer, may be disposed between the heating device and the housing of the heat dissipation device, so as to implement the indirect contact.

In addition, the heat generating device may be a chip, a battery, or a battery circuit board. The heat dissipation device can be a passive heat dissipation device such as a heat pipe and a temperature equalization plate, and can be applied to terminal electronic equipment such as a mobile phone, and the main application field is to efficiently dissipate heat of a high-temperature component.

The heat abstractor of embodiment of this application has solved the liquid drop that the reverse flow of vapor-liquid caused in the samming board and has carried the problem, has improved the overall arrangement of inside wick structure and cavity, can realize steam and liquid homodromous flow, avoids reverse flow's steam to carry liquid, makes liquid be detained the condensation zone, helps returning liquid to the evaporation zone, promotes the reliability that the capillary returns the liquid, effectively prevents to appear the condition of drying out.

Fig. 3A is a schematic top view of the heat dissipating device according to the first embodiment of the present application after the upper cover is removed. FIG. 3B is a schematic cross-sectional view of the heat dissipating device shown in FIG. 3A at line A-A. As shown in fig. 3A and 3B, the heat dissipating device includes a housing 1, a fluid working substance (not shown) contained in the housing 1, and a wick structure 2. The housing 1 may include an upper cover plate 11, a lower cover plate 12, and an annular support structure 13 between the upper cover plate 11 and the lower cover plate 12. The annular support structure 13 may be integrally formed with one of the upper and

lower cover plates

11 and 12, or the annular support structure 13 may be separately formed from the upper and

lower cover plates

11 and 12, respectively. The upper cover plate 11, the lower cover plate 12 and the annular support structure 13 may form a closed interior space/cavity for the flow of gas, liquid.

The wick structure can be a porous wick structure, the surface tension of the fluid is dominant for the flow in the pores, and capillary force generated by the wick can absorb liquid drops formed by condensation in the cavity and drive seepage of the liquid in the wick. The wick structure may be a capillary structure; the capillary structure is formed in at least one of the following ways: braiding, sintering, etching and electroplating. I.e. the material of the capillary structure may comprise at least one of a woven material, a sintered material, an etched material and an electroplated material. In addition, the specific structure of the capillary structure may include a plurality of groove structures and a plurality of protrusion structures, which 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 in a first direction, the evaporation regions a being for being disposed at the heat generating device such that the fluid working medium at the evaporation regions a forms vapor and flows toward the condensation regions b. The first direction is perpendicular to the thickness direction of the housing 1, and may be, for example, a length direction or a width direction of the housing 1. It is understood that the first direction may be other directions than the longitudinal direction and the width direction of the housing 1. The following description will mainly take an example in which the first direction is the longitudinal direction of the housing 1. Furthermore, the evaporation zone a and the condensation zone b may be directly connected, or a transition region may be provided between the evaporation zone a and the condensation zone b, and the transition region may be a region between the evaporation zone a and the condensation zone b shown in fig. 3A. The wick structure 2 is disposed within the housing 1 and includes a first flow-directing wick 21, a second flow-directing wick 22, and at least one return wick 23. The first diversion liquid suction core 21 is located in the evaporation area a, the first end D1 of the second diversion liquid suction core 22 is arranged in a hanging mode and located in the condensation area b or extends to the evaporation area a, the second end D2 of the second diversion liquid suction core 22 is located in the condensation area b, the first end of the backflow liquid suction core 23 is connected with the first diversion liquid suction core 21, and the second end of the backflow liquid suction core 23 is connected with the second end D2 of the second diversion liquid suction core 22.

It should be noted that, the "suspended arrangement" herein refers to that the first end D1 of the second guiding wick 22 is a cavity of the housing, and no other component is disposed. Alternatively, the "suspended arrangement" means that the first end D1 of the second guiding wick 22 is disposed at equal intervals with other components in the housing 1, such as the first guiding wick 21, the backflow wick 23 and the spacer 3, and an interval space is provided between the first end D1 of the second guiding wick 22 and the other components. In one example, the "floating arrangement" may be such that the end surface of the first end D1 of the second flow-directing wick 22 is positioned within or in contact with the cavity; in another example, the "hanging arrangement" may be that the end surface and the side surface of the first end D1 of the second guiding wick 22 are both provided with a cavity, or are in contact communication with the cavity.

In fig. 3A, the inner space of the housing 1 includes a set of evaporation regions a and condensation regions b arranged in the first direction. The first guiding wick 21 includes a rod-shaped guiding portion 213, and an end portion of the rod-shaped guiding portion 213 near the condensation zone b in the first direction is connected to the first end of the backflow wick 23. In addition, in one example, two sides of the rod-shaped diversion part 213 along the thickness direction are respectively contacted with the side wall of the shell 1, namely, the rod-shaped diversion part 213 is in a parallel structure; alternatively, in another example, one side of the rod-shaped guide 213 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the rod-shaped guide 213 in the thickness direction is spaced apart from the side wall of the housing 1. Wherein, the side walls of the housing 1 contacting with both sides of the wick structure 2 such as the rod-shaped flow guide portion 213 in 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 housing 1 that is in contact with one side of the wick structure 2, such as the rod-shaped flow guide 213, in the thickness direction refers to the inner surface of the upper cover plate 11 or the inner surface of the lower cover plate 12.

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

scheme 1-as shown in fig. 3A, the first end D1 of the second flow-directing wick 22 is located in the condensation zone b and the vapor flow path includes a second portion P2 and a first portion P1 adjacent to the second flow-directing wick 22. One end of the second part P2 of the vapor flow channel is communicated with the evaporation zone a, the other end of the second part P2 of the vapor flow channel is communicated with one end of the first part P1 of the vapor flow channel and the first end D1 of the second guiding wick 22, and the other end of the first part P1 of the vapor flow channel extends to the second end of the backflow wick 23.

Scheme 2-the first end D1 of the second flow-directing wick 22 extends to the evaporation zone a, the vapor flow path comprising a first portion P1 adjacent to the second flow-directing wick 22. One end of the first portion P1 of the vapor flow path communicates with the evaporation zone a, and the other end of the first portion P1 of the vapor flow path extends to the second end of the return wick 23.

That is, the first end D1 of the second guiding wick 22 disposed in the air may be located in the condensation zone b, as shown in fig. 3A, where the vapor flow channel includes a second portion P2 and a first portion P1 adjacent to the second guiding wick 22. The first end of the second flow-directing wick 22 that is suspended may extend to the evaporation zone a, if desired, where the vapor flow path may include only the first portion P1 adjacent to the second flow-directing wick 22.

With continued reference to fig. 3A, the second flow-guiding wick 22 may include a plurality of sub-wicks 221 disposed at intervals, a second end of each of the plurality of sub-wicks 221 being connected to the return wick 23, a first end of each of the plurality of sub-wicks 221 being disposed in suspension, and the first portion P1 of the vapor flow channel including a third interval space between adjacent sub-wicks 221. Moreover, both sides of each sub-wick 221 along the thickness direction can be respectively contacted with the side wall of the shell 1, namely, the second diversion wick 22 is in a parallel structure at this time; alternatively, one side of each sub-wick 221 in the thickness direction contacts with the side wall of the housing 1, and the other side of each sub-wick 221 in the thickness direction is spaced from the side wall of the housing 1 to form a second spacing space of the vapor flow channel, and the second guiding wicks 22 are in a serial structure.

In addition, the first portion P1 of the vapor flow channel may include at least one of a first spacing space between the backflow-wick 23 and the second flow-guide-wick 22 and a second spacing space between the casing 1 and the second flow-guide-wick 22. As shown in fig. 3A, in the region where the plurality of sub-wicks 221 are provided, the sub-wick 221 located at the innermost side is spaced apart from the return wick 23 (or a spacer 3 to be described later) to form a first spacing space; the secondary wick 221 located at the outermost side is spaced apart from the annular support structure 13 of the housing 1 to form a second spacing space.

Also, the second portion P2 of the vapor flow channel may include at least one of a first spaced region between the first guide wick 21 and the case 1 and a second spaced region at the vapor-facing side of the return wick 23 (a portion not adjacent to the second guide wick 22). As shown in fig. 3A, the first guiding wick 21, such as the rod-shaped guiding portion 213, is disposed at a distance from the annular supporting structure 13 of the housing 1 to form a first interval region; the vapor-facing side of the return wick 23 is spaced from the annular support structure 13 of the housing 1 in a region between the evaporation zone a and the first portion P1 of the vapor flow path to form a second spaced region.

Further, the extending direction of the first end D1 of the second guiding wick 22 to the second end D2 of the second guiding wick 22 coincides with the extending direction of the first portion of the steam flow channel, and the first end D1 of the second guiding wick 22 is close to the evaporation area a relative to the second end D2 of the second guiding wick 22 along the extending direction of the steam flow channel. By "extending in the same direction" is meant that the second flow-directing wick 22 extends in a direction substantially the same as the direction in which the first portion P1 of the vapor flow channel extends, the second flow-directing wick 22 extending generally along the direction in which the first portion P1 of the vapor flow channel extends.

The extension direction of the second flow-guiding wick 22 may thus be set as: such that in the second guiding wick 22, a portion of the second guiding wick 22 that is close to the first end D1 of the second guiding wick 22 in the extending direction of the second guiding wick 22 is relatively far from the first end D1 of the second guiding wick 22 is contacted with the vapor. That is, the extending direction of the second guide wick 22 is set such that the flow direction of a part of the vapor in the space of the condensing zone b is from the first end D1 of the second guide wick 22 to the second end D2 of the second guide wick 22, and another part of the vapor in the vapor is condensed into liquid in the condensing zone b and may be returned to the evaporation zone a through the first end D1 of the second guide wick 22, the second end D2 of the second guide wick 22, the second end of the return wick 23, and the first end of the return wick 23 in this order.

Because the first suspended end of the second diversion liquid suction core 22 contacts steam first, the liquid after steam condensation firstly enters the first suspended end D1 of the second diversion liquid suction core 22, then moves to the second end D2 of the second diversion liquid suction core 22 under the action of capillary force, namely, the flowing direction of the condensed liquid in the second diversion liquid suction core 22 is the same as the flowing direction of steam (from the first suspended end D1 of the second diversion liquid suction core 22 to the second end D2 of the second diversion liquid suction core 22) from the first suspended end D1 of the second diversion liquid suction core 22 to the second suspended end D2 of the second diversion liquid suction core 22, so that the same-direction flowing of steam and liquid is realized, the backward flowing of the steam carrying liquid can be avoided, the liquid is retained in the condensing area b, the liquid is helped to the evaporating area a, the burning condition is effectively prevented, and the reliability of the product is improved.

Then, the liquid at the second end D2 of the second guiding wick 22 enters the second end of the backflow wick 23 and continues to move to the first end of the backflow wick 23 under the action of capillary force, that is, the flow direction of the condensed liquid in the backflow wick 23 is from the second end of the backflow wick 23 to the first end of the backflow wick 23, opposite to the flow direction of the vapor (from the suspended first end D1 of the second guiding wick 22 to the second end D2 of the second guiding wick 22), and then the liquid at the first end of the backflow wick 23 enters the first guiding wick 21, where the first guiding wick 21 is located in the evaporation zone, where the liquid can be converted into vapor again for the next cycle.

Since the flow direction of the liquid in the backflow wick 23 (from the condensation region to the evaporation region) is opposite to the flow direction of the vapor in the inner space of the casing 1 (from the evaporation region to the condensation region), the reverse flow may carry droplets, so that the condensed droplets are retained in the condensation region, and the liquid is not beneficial to the liquid backflow to the evaporation region for liquid supplementation. To isolate the vapor from the liquid in the reflow wicks 23, the heat sink may further comprise a spacer 3, the spacer 3 being provided on the vapor-facing side of each reflow wick 23. In fig. 3A, the reflow wick 23 is located in the middle of the housing 1, and both sides of the reflow wick 23 are provided with the spacers 3, respectively.

Wherein both sides of the spacer 3 in the thickness direction are respectively in contact with the side walls of the housing 1, so that the spacer 3 and the housing 1 can form a relatively closed space accommodating the reflux wick 23. The spacer 3 is used for isolating the flowing gas in the cavity from the liquid in the backflow wick 23, so that the vapor in the inner space of the shell 1 is prevented from carrying the liquid in the backflow wick 23, the condensed liquid drops are retained in the condensation area b, and meanwhile, the spacer 3 can play a role in supporting the shell 1, and the structural strength is improved.

Further, for convenience of installation, the spacer 3 may be integrally formed with the side wall of one side of the housing 1 in the thickness direction, such as the upper cover plate 11 or the lower cover plate 12. The spacer 3 and the upper cover plate 11 and the lower cover plate 12, which are side walls of one side in the thickness direction of the case 1, may also be formed separately, if necessary, and may be connected to the upper cover plate 11 and the lower cover plate 12 by bonding/welding.

As shown in fig. 3A, the backflow wick 23 is linear, and the separator 3 may be of unitary construction. In addition, each sub-capillary 231 of the second flow-directing wick 22 is of curvilinear configuration; alternatively, the secondary flow-directing wick 22 may be of other shapes, such as linear (see fig. 4A described below) or arcuate (see fig. 9A described below).

Fig. 4A is a schematic top view of a heat dissipating device according to a second embodiment of the present disclosure after the upper cover is removed. As shown in fig. 4A, the wick structure 2 may further comprise a third flow-directing wick 24. The third diversion liquid suction core 24 is located in the condensation area b and is connected with the second end D2 of the second diversion liquid suction core 22 and the backflow liquid suction core 23, and the third diversion liquid suction core 24 is used for guiding the liquid in the second diversion liquid suction core 22 into the backflow liquid suction core 23, namely, the third diversion liquid suction core 24 is used for collecting condensate in the second diversion liquid suction core 22. Also, since the vapor at the end of the condensing zone b away from the evaporating zone b is easily condensed into a liquid, or more liquid is formed there, a third guiding wick 24 may be provided there so as to guide the liquid there to the return wick 23.

The extending direction of the third guiding wick 24 and the extending direction of the second guiding wick 22 may be designed according to specific working requirements. In fig. 4A, in a set of evaporation zone a and condensation zone b arranged in a first direction, the third flow-guiding wick 24 extends in a second direction that is perpendicular to the thickness direction of the housing 1 and is disposed at an angle to the first direction. For example, the second direction is the width direction or the length direction of the housing 1. It is understood that the second direction may be other directions than the longitudinal direction and the width direction of the housing 1. In this embodiment, the first direction is mainly taken as the length direction of the housing 1 and the second direction is taken as the width direction of the housing 1 as an example for explanation, and at this time, the first direction and the second direction are 90 degrees, that is, are perpendicular to each other. The second flow-directing wick 22 extends from the third flow-directing wick 24 toward the evaporation zone a, with the first end D1 of the second flow-directing wick 22 being proximate the evaporation zone a relative to the second end D2 of the second flow-directing wick 22. At this point, the second flow-directing wick 22 may extend in the first direction. Also, among the plurality of sub-wicks 221 of the second guide wick 22 on the side of the return wick 23, the first ends of the sub-wicks 221 located at the intermediate position may extend beyond the first ends of the sub-wicks 221 located at both sides.

With continued reference to fig. 4A, the first diversion wick 21 includes a rod-shaped diversion portion 213 and a plurality of branch diversion portions 214 arranged side by side and at intervals, each branch diversion portion 214 extends in a direction away from the rod-shaped diversion portion 213, the rod-shaped diversion portion 213 is linear and extends in a first direction, and the plurality of branch diversion portions 214 are disposed on a side face of the rod-shaped diversion portion 213 facing the steam in a second direction. In fig. 4A, the rod-shaped flow guiding portion 213 is located at a middle portion of the housing along the second direction, and a plurality of branch flow guiding portions 214 are respectively disposed at two sides of the rod-shaped flow guiding portion 213 along the second direction. In addition, in one example, two sides of each branch flow guiding portion 214 along the thickness direction are respectively contacted with the side wall of the shell 1, that is, the branch flow guiding portions 214 are in parallel structure; alternatively, in another example, one side of each of the branch flow guiding portions 214 in the thickness direction contacts with the side wall of the housing 1, and the other side of each of the branch flow guiding portions 214 in the thickness direction is spaced from the side wall of the housing 1, that is, the branch flow guiding portions 214 are in a serial structure.

Further, the at least one backflow-wick 23 may comprise one or more first backflow-wicks 231. In fig. 4A, the reflow wick 23 includes only one first reflow wick 231. The first backflow liquid suction core 231 is positioned in the middle of the shell 1 along the second direction, and second diversion liquid suction cores 22 are respectively arranged on two sides of the first backflow liquid suction core 231; the second end of the first return wick 231 is connected to the middle of the third flow-guiding wick 24. And, both sides of the return wick 23 in the second direction are provided with spacers 3, respectively. The return wick 23 comprises a folded multi-segment structure and each spacer 3 may comprise a plurality of segments spaced apart along the extension of the return wick 23.

In fig. 4A, the first portion P1 of the vapor flow channel includes a first space between the backflow wick 23 and the second guide wick 22, i.e., the innermost sub-wick 221, a second space between the case 1 and the second guide wick 22, i.e., the outermost sub-wick 221, and a third space between adjacent sub-wicks 221. The second part P2 of the vapor flow channel comprises a first spaced area between the first guiding wick 21 and the annular support structure 13 of the housing 1 and a second spaced area at the vapor-facing side of the return wick 23 (where it is not adjacent to the second guiding wick 22).

FIG. 4B is a schematic cross-sectional view of the heat sink shown in FIG. 4A at line A-A, line B-B and line C-C. In fig. 4B, as can be seen from the sectional view A-A, the first diversion wick 21 (including the rod-shaped diversion portion 213 and the plurality of branch diversion portions 214) of the evaporation zone a adopts a parallel architecture; as seen in section B-B, the reflow wick 23 adopts a parallel architecture; as can be seen from the C-C cross-sectional view, the second guiding wick 22 of the condensation zone b adopts a parallel architecture; i.e. the wick structure 2 may all be designed with a parallel architecture. It is understood that the first guiding wick 21, the second guiding wick 22 and the backflow wick 23 may also adopt a serial architecture or a serial architecture for one part of the three and a parallel architecture for the other part.

According to the heat dissipation device of the second embodiment, the suspended first end D1 of the second diversion liquid suction core 22 is firstly contacted with steam, and the flowing direction of liquid in the second diversion liquid suction core of the condensation area b is the same as the flowing direction of gas in the cavity, so that the blocking effect of liquid drop carrying on backflow is eliminated, the steam flowing pressure drop in the cavity is smaller, and the temperature uniformity is improved.

Fig. 5A is a schematic top view of a modification of the heat dissipating device shown in fig. 4A. The difference from the heat dissipating device shown in fig. 4A is that in fig. 5A, the second guiding wick 22 has a plate-like structure, one side of the second guiding wick 22 in the thickness direction contacts the side wall of the housing 1, and the other side of the second guiding wick 22 in the thickness direction is spaced from the side wall of the housing 1 to form a second spacing space of the steam flow channel, and at this time, the second guiding wick 22 has a serial structure. Because the second diversion liquid suction core 22 is in a plate structure, a larger space of the condensation area is generally occupied, in order to ensure that steam can flow to the end part of the condensation area b far away from the evaporation area a so as to be condensed into liquid as soon as possible, the second diversion liquid suction core 22 can be in a serial structure, and the other side of the second diversion liquid suction core 22 along the thickness direction is arranged at intervals with the side wall of the shell 1, so that a space for steam to flow can be formed. In addition, the spacers 3 provided on both sides of the return wick 23 may be of an integral structure.

In addition, in fig. 5A, the second guide wick 22 is of a plate-like structure, and the first portion P1 of the vapor flow channel may include a first spacing space between the backflow wick 23 and the second guide wick 22, a second spacing space between the annular support structure 13 of the case 1 and the second guide wick 22, and a second spacing space between one side of the second guide wick 22 in the thickness direction and the side wall of the case 1, i.e., the upper cover plate 11 or the lower cover plate 12. The second part P2 of the vapor flow channel comprises a first spaced area between the first guiding wick 21 and the annular support structure 13 of the housing 1 and a second spaced area at the vapor-facing side of the return wick 23 (where the second guiding wick 22 is not provided).

FIG. 5B is a schematic cross-sectional view of the heat dissipating device shown in FIG. 5A at 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 architecture, and the backflow wick 23 adopts a parallel architecture, that is, the wick structure 2 adopts a serial-parallel combination mode. The flow direction of the reflux condensate in the second diversion wick 22 of the condensation zone b is the same as the flow direction of the steam in the cavity, and 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 dissipating device shown in fig. 5A. The difference from the heat dissipating device shown in fig. 5A is that in fig. 6A, the first guiding wick 21 includes a plate-shaped main body 211, and one side of the first guiding wick 21 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the first guiding wick 21 in the thickness direction is spaced from the side wall of the housing 1, that is, the first guiding wick 21 is of a serial structure.

In addition, in fig. 6A, the first portion P1 of the steam flow path is the same as the structure in fig. 5A. The second portion P2 of the vapor flow channel includes a first spaced region between the first guide wick 21 and the upper or

lower cover plate

11 or 12 of the housing 1 and a second spaced region at the vapor-facing side of the return wick 23 (where the second guide wick 22 is not provided).

FIG. 6B is a schematic cross-sectional view of the heat dissipating device shown in FIG. 6A at line A-A. As shown in fig. 6B, the first flow-guiding wick 21 and the second flow-guiding wick 22 adopt a serial architecture, and the third flow-guiding wick 24 adopts a parallel architecture, that is, the wick structure 2 adopts a serial-parallel combination manner.

Fig. 7 is a schematic top view of a modification of the heat dissipating device shown in fig. 6A. The difference from the heat dissipating device shown in fig. 6A is that in fig. 7, the first guide wick 21 further includes a plurality of branch portions 212 arranged at intervals, each of the branch portions 212 is connected to the plate-shaped body 211 and the side wall of the case 1 on both sides in the thickness direction, respectively, and the return wick 23 is connected to at least one of the plate-shaped body 211 and the plurality of branch portions 212, that is, the first guide wick 21 is combined in series-parallel. In addition, the at least one backflow wick 23 comprises more than two backflow wicks 23 located in the middle of the casing 1 along the second direction, a third diversion wick 24 is arranged at the second end of each backflow wick 23, third diversion wicks 24 at the second ends of different backflow wicks 23 are arranged at intervals, the width of each third diversion wick 24 is larger than that of each backflow wick 23, and each third diversion wick 24 is connected with at least part of the second diversion wick 22. The two sides of each return wick 23 in the second direction are provided with a separator 3, respectively.

That is, the wick structure 2 uses a serial-parallel combination manner, specifically, the first diversion wick 21 of the evaporation area a adopts a serial-parallel combination manner, the second diversion wick 22 of the condensation area b adopts a serial architecture, and the reflow wick 23 can use a parallel architecture and can be multiple. The wick structure 2 of this embodiment also enables the flow of the reflux condensate in the second flow-guiding wick 22 of the condensation zone b to be in the same direction as the flow of the vapor in the cavity. In addition, third flow-guiding wicks 24 at the second ends of the different flow-back wicks 23 may be arranged at intervals to connect different positions of the second flow-guiding wicks 22, so that liquid at different positions in the second flow-guiding wicks 22 may enter the corresponding flow-back wicks 23 through the connected third flow-guiding wicks 24, respectively.

Further, in fig. 7, the second guide wick 22 has a plate-like structure, and the first portion P1 of the vapor flow channel may include a region in which the return wick 23 and the third guide wick 24 are not disposed in the space between one side of the second guide wick 22 in the thickness direction and the upper or

lower cover plate

11 or 12 of the case 1. The first portion P1 of the vapor flow channel may also include a second spacing space between the annular support structure 13 of the housing 1 and the second flow-directing wick 22. The second part P2 of the vapor flow channel comprises a first spaced-apart region between the first guiding wick 21 and the housing 1 (e.g. one of the upper and

lower cover plates

11, 12 and/or the annular support structure 13) and a second spaced-apart region at the vapor-facing side of the reflow wick 23 (where the second guiding wick 22 is not provided).

Fig. 8A is a schematic top view of a heat dissipating device according to a third embodiment of the present disclosure after the upper cover is removed. The difference from the heat dissipating device shown in fig. 4A is that in fig. 8A, at least one reflow wick 23 includes a second reflow wick 232, the second reflow wick 232 is located on one side of the housing 1 in the second direction, and a side of the reflow wick 23, which is remote from the side of the housing 1, is provided with a second flow guiding wick 22; the second end D2 of the second return wick 232 is connected to one end of the third flow-directing wick 24. The side of the return wick 23 remote from the housing 1 is provided with a spacer 3. The spacer 3 may be of a segmented construction and comprise only one segment. The first diversion wick 21 includes a rod-shaped diversion portion 213, one side of the rod-shaped diversion portion 213 along the second direction is disposed in contact with the side wall of the housing 1, and a plurality of branch diversion portions 214 are disposed on the other side of the rod-shaped diversion portion 213 along the second direction. The second flow-directing wick 22 may extend in a first direction and the third flow-directing wick 24 may extend in a second direction.

In fig. 8A, the first portion P1 of the vapor flow channel includes a first space between the backflow wick 23 and the second guide wick 22, i.e., the innermost sub-wick 221, a second space between the case 1 and the second guide wick 22, i.e., the outermost sub-wick 221, and a third space between adjacent sub-wicks 221. The second part P2 of the vapor flow channel comprises a first spaced area between the first guiding wick 21 and the annular support structure 13 of the housing 1 and a second spaced area at the vapor-facing side of the return wick 23 (where the second guiding wick 22 is not provided).

FIG. 8B is a schematic cross-sectional view of the heat sink shown in FIG. 8A at line A-A, line B-B and line C-C. In fig. 8B, as seen in section A-A, the reflow wick 23 adopts a parallel architecture; as can be seen from the cross-sectional view B-B, the second guiding wick 22 of the condensation zone B adopts a parallel architecture; as can be seen from the C-C cross-sectional view, the third guiding wick 24 of the condensation zone b adopts a parallel architecture.

In addition, in the heat dissipating device shown in fig. 3A, 4A, 5A, and 6A, the reflow wick 23 includes a first reflow wick 231, the first reflow wick 231 is located at a middle portion of the case 1 in the second direction, and in the heat dissipating device shown in fig. 8A, the reflow wick 23 includes a second reflow wick 232, and the second reflow wick 232 is located at one side of the case 1 in the second direction. In other embodiments, the reflow-wick 23 may include both the first reflow-wick 231 and the second reflow-wick 232, and in this case, the second reflow-wick 232 may be in a serial architecture or a parallel architecture.

Fig. 9A is a schematic top view of a heat dissipating device according to a fourth embodiment of the present disclosure after an upper cover is removed. As shown in fig. 9A, the condensation zone b extends outward in a direction from near the evaporation zone a to far from the evaporation zone a, the backflow wick 23 extends in the first direction and is located on one side of the evaporation zone a in the second direction, the side of the backflow wick 23, which is the side facing the vapor, away from the housing 1 is provided with the spacer 3, one end of the third flow-guiding wick 24 is connected to a portion of the second end of the backflow wick 23, which is near the evaporation zone a, the other end of the third flow-guiding wick 24 extends in a direction from the evaporation zone a and the backflow wick 23, the second flow-guiding wick 22 extends from the third flow-guiding wick 24 in a direction from the evaporation zone a and is bent toward the backflow wick 23, and the second end D2 of the second flow-guiding wick 22 is near the evaporation zone a with respect to the first end D1 of the second flow-guiding wick 22.

The first diversion wick 21 includes a rod-shaped diversion portion 213, one side of the rod-shaped diversion portion 213 along the second direction is disposed in contact with the side wall of the housing 1, and a plurality of branch diversion portions 214 are disposed on the other side of the rod-shaped diversion portion 213 along the second direction. The second flow-directing wick 22 is arcuate. The second guiding wick 22 includes a plurality of sub-wicks 221 arranged at intervals, and the plurality of sub-wicks 221 may be in a parallel architecture or a serial architecture. Alternatively, the second guiding wick 22 is also plate-like in structure and adopts a serial architecture.

In addition, in fig. 9A, the first portion P1 of the vapor flow channel includes a first spacing space between the backflow-wick 23 and the second flow-guiding wick 22, i.e., the adjacent sub-wick 221, a second spacing space between the case 1 and the second flow-guiding wick 22, i.e., the adjacent sub-wick 221, and a third spacing space between the adjacent sub-wicks 221. The second part P2 of the vapor flow channel comprises a first spaced area between the first guiding wick 21 and the annular support structure 13 of the housing 1 and a second spaced area at the vapor-facing side of the return wick 23 (where the second guiding wick 22 is not provided).

FIG. 9B is a schematic cross-sectional view of the heat sink shown in FIG. 9A at line A-A and line B-B. In fig. 9B, as seen in section A-A, the reflow wick 23 adopts a parallel architecture; as can be seen from the cross-sectional view B-B, the second 22 and third 24 diversion wicks of the condensation zone B are in a parallel architecture.

In this embodiment, the shape of the wick structure 2 is adjusted, but it is still ensured that the first end D1, i.e. the top, of the second guiding wick 22 of the condensation zone b is first contacted with the vapor generated in the evaporation zone a, and the vapor in the cavity runs in the same direction as the return liquid in the second guiding wick 22, facilitating the return of the condensate.

In addition, in the heat dissipating device of the present example, the shape of the case 1 may be designed as needed. In one example, as shown in fig. 9A, the housing 1 sequentially includes a first region (provided with an evaporation region a), a second region, and a third region (provided with a condensation region b) along a first direction, the first region has a smaller width than the third region, the second region is a flaring structure, a small end of the flaring structure is connected with the first region, and a large end of the flaring structure is connected with the third region. It will be appreciated that the housing 1 may also have other shapes, such as a rectangular body, as described below in connection with fig. 10 and 11.

Fig. 10 is a schematic top view of a heat dissipating device according to a fifth embodiment of the present disclosure after the upper cover is removed. As shown in fig. 10, at least one of the return wicks 23 includes a third return wick 233 and a fourth return wick 234, which are respectively located on both sides of the casing 1 in the second direction; second flow-directing wick 22 is positioned between third return wick 233 and fourth return wick 234 and may extend in a first direction; a space is arranged between the first end D1 of the second guiding wick 22 and the first guiding wick 21 along the first direction; the first ends D1 of the second flow-directing wicks 22 may be disposed flush, the second flow-directing wicks 22 may comprise a plurality of wicks 221, and the heights of the first ends of the plurality of sub-wicks 221 may be substantially uniform. The third flow-directing wick 24 may extend in a second direction.

Both ends of the first guide wick 21 in the second direction are connected to respective first ends of the third return wick 233 and the fourth return wick 234; both ends of the third guide wick 24 in the second direction are connected to respective second ends of the third return wick 233 and the fourth return wick 234, respectively.

The first diversion wick 21 includes a rod-shaped diversion portion 213 and a plurality of branch diversion portions 214 arranged side by side and at intervals, the rod-shaped diversion portion 213 is U-shaped, or the rod-shaped diversion portion 213 includes two L-shaped structures, a first side of the L-shape is connected with the backflow wick 23, the plurality of branch diversion portions 214 are arranged on the first side or the second side of the L-shape and face the inner side of the L-shape, in fig. 10, the plurality of branch diversion portions 214 are arranged on the second side of the L-shape and are located on the side face of the rod-shaped diversion portion 213 facing the steam along the extending direction, and each branch diversion portion 214 extends along the direction away from the rod-shaped diversion portion 213.

In this embodiment, the casing 1 is rectangular, the width of the evaporation area a is consistent with that of the condensation area b, the area of the evaporation area a is larger, and a plurality of heat sources or large-area heat generating devices can be arranged corresponding to the evaporation area a to dissipate heat, so that the heat dissipation device can be suitable for a scene of dissipating heat of a plurality of heat sources, namely, large-area heat generating devices of the heat generating devices.

In addition, in fig. 10, the first portion P1 of the vapor flow channel includes a first spacing space between the backflow wick 23 or the partition 3 and the second guide wick 22, i.e., the adjacent sub-wick 221, and a third spacing space between the adjacent sub-wicks 221. The second portion P2 of the vapor flow channel includes a second spaced region at the vapor-facing side of the return wick 23 (a location not adjacent to the second flow-directing wick 22), i.e., a spaced space formed by the third return wick 233 and the fourth return wick 234, between the first end D1 of the first flow-directing wick 21 and the second flow-directing wick 22.

Fig. 11 is a schematic top view of a heat dissipating device according to a sixth embodiment of the present disclosure after an upper cover is removed. As shown in fig. 11, the inner space of the case 1 includes a first evaporation area a1 and a first condensation area b1 arranged along a first direction, and a second evaporation area a2 and a second condensation area b2 arranged along the first direction, the first evaporation area a1 and the second condensation area b2 being arranged side by side as along a second direction and being located at a first end of the case 1 along the first direction; the first condensation zone b1 and the second evaporation zone a2 are arranged side by side along the second direction, and are positioned at the second end of the shell 1 along the first direction; a space is provided between the second guide wick 22 of the first condensation zone b1 and the first guide wick 21 of the second evaporation zone a2 and the first guide wick 21 of the first evaporation zone a1 and the first guide wick 21 of the second condensation zone b 2.

The backflow wick 23 includes a fifth backflow wick 235 and a sixth backflow wick 236, the fifth backflow wick 235 being located at a first side of the case 1 in the second direction, the sixth backflow wick 236 being located at a second side of the case 1 in the second direction, the fifth backflow wick 235 being connected to a first end of each of the first diversion wick 21 of the first evaporation zone a1 and the third diversion wick 24 of the first condensation zone b1 in the second direction, and the sixth backflow wick 236 being connected to a second end of each of the first diversion wick 21 of the second evaporation zone a2 and the third diversion wick 24 of the second condensation zone b2 in the second direction. Also, a separator 3 may be provided on the side of the backflow wick 23 facing the vapor so as to separate the vapor flowing in the opposite direction from the backflow liquid in the backflow wick 23.

The first diversion liquid suction core 21 comprises a rod-shaped diversion part 213 and a plurality of branch diversion parts 214 which are arranged side by side at intervals, the rod-shaped diversion part 213 is of an L shape, a first edge of the L shape is connected with the backflow liquid suction core 23, and the plurality of branch diversion parts 214 are arranged on a second edge of the L shape and face to the inner side of the L shape. And, a plurality of branch guide portions 214 are provided at a side of the rod-shaped guide portion 213 facing the steam in the second direction, each branch guide portion 214 extending in a direction away from the rod-shaped guide portion 213.

Further, both ends of the rod-shaped guide part 213 in the first evaporation zone a1 are connected to the fifth reflux wick 235 and the third guide wick 24 in the second condensation zone b2, respectively; both ends of the rod-shaped guide 213 in the second evaporation zone a2 are connected to the sixth return wick 236 and the third guide wick 24 in the first condensation zone b1, respectively, so that the wick structure 2 can form a closed loop shape. In addition, the diversion liquid absorption cores of each evaporation area and the condensation area can adopt a parallel architecture, and can also adopt a serial architecture design.

The second flow-directing wick 22 may extend in a first direction. The third flow-directing wick 24 may extend in a second direction. In order to form a space between the second guide wick 22 of the first condensation zone b1 and the first guide wick 21 of the second evaporation zone a2 and the first guide wick 21 of the first evaporation zone a1 and the first guide wick 21 of the second condensation zone b2, in the first condensation zone b1, the second guide wick 22 such as the plurality of sub-wicks 221 is reduced in length in the direction from the first evaporation zone a1 to the second evaporation zone a 2; in the second condensation zone b2, the second guide wick 22, such as the plurality of sub-wicks 221, increases in length in the direction from the first evaporation zone a1 to the second evaporation zone a 2. That is, in this implementation, the first end D1 of the second guide wick 22 of the first condensation region b1 forms an inclined structure, and the first end D1 of the second guide wick 22 of the second condensation region b2 forms an inclined structure, and the two inclined structures may be disposed in parallel and at a distance to form a space.

In addition, in fig. 11, the first portion P1 of the vapor flow channel includes a first spacing space between the backflow wick 23 or the partition 3 and the second guide wick 22, i.e., the adjacent sub-wick 221, and a third spacing space between the adjacent sub-wicks 221. The second portion P2 of the vapor flow channel includes a second spaced region at the vapor-facing side of the backflow-wick 23 (a location not adjacent to the second flow-guiding wick 22), and in particular, the second spaced region may be a spaced space between the first flow-guiding wick 21 and the first ends D1 of the second flow-guiding wick 22, i.e., the plurality of sub-wicks 221.

In this embodiment, two evaporation areas, namely, the first evaporation area a1 and the second evaporation area a2 are provided, and a heat generating device may be provided corresponding to each evaporation area, so that it is applicable to a scene of a plurality of heat generating sources. The heat dissipating device satisfies the feature that the vapor generated in the evaporation area first contacts the top, i.e., the first end D1, of the second diversion wick 22 in the condensation area, and can also realize the co-current flow of the gas and the liquid in the condensation area. It should be noted that this embodiment is only an example of an application scenario of two heat sources, and may be changed accordingly according to specific working requirements, for example, setting more evaporation areas, setting more condensation areas, or adjusting positions, shapes, etc. of the evaporation areas and the condensation areas.

In addition, the heat dissipating device, such as the manufacturing and processing flow of the temperature equalization plate, comprises a link for exhausting air to realize internal vacuum, and an exhaust opening is required to be designed at the edge of the temperature equalization plate. Because the condensing zone has a high requirement on the flatness of the temperature equalization plate, the extraction opening is generally arranged in the evaporation zone.

Fig. 12 is a schematic top view of a heat dissipating device with an upper cover removed. As shown in fig. 12, the heat sink includes an evaporation zone and a condensation zone, with a wick, such as a capillary structure, located in a cavity inside the support structure of the housing. In the scheme shown in fig. 12, since the opening of the internal cavity formed by the liquid suction cores is opposite to the pumping port, the cavity between the liquid suction cores in the condensation area is easy to have gas residue in the vacuumizing process, and an uneven structure can be formed, that is, the problem that the gas in the internal cavity cannot be pumped cleanly exists.

In the embodiments described above, the cavity flow path is simple, the opening of the inner cavity formed by the wick structure 2 faces the extraction opening, the gas in the inner cavity can be rapidly extracted through the extraction opening H of the evaporation area a, and the gas residue is not easy to occur in the vacuum extraction process in the cavity at the second diversion wick 22 of the condensation area b, so that the uneven structure is avoided. Therein, the extraction opening H is exemplarily shown in fig. 4A and 10.

Specifically, for convenience in evacuation, the embodiments of the present application may have, but are not limited to, the following two schemes:

scheme 1-as shown in fig. 4A, the wick structure 2 does not form a closed structure in the casing 1, and an air extraction opening H is provided on the casing 1, where the air extraction opening H corresponds to one of the evaporation zone a and the condensation zone b, and the air extraction opening H is directly communicated with one of the evaporation zone a and the condensation zone b. In fig. 4, the air extraction opening H corresponds to the evaporation area a, and the evaporation area a is communicated with the condensation area b, so that the evaporation area a and the condensation area b can be extracted through the air extraction opening H.

Scheme 2-as shown in fig. 10, the wick structure 2 forms a closed structure in the casing 1, the casing 1 is provided with an air extraction opening H, the air extraction opening H corresponds to one of the evaporation zone a and the condensation zone b, the wick structure 2 at one of the evaporation zone a and the condensation zone b is provided with a through opening K, and the air extraction opening H is communicated with one of the evaporation zone a and the condensation zone b through the through opening K. In fig. 10, the suction opening H corresponds to the evaporation area a. The wick structure 2 at the evaporation area a is provided with a through opening K, the air extraction opening H is communicated with the evaporation area a through the through opening K, and the evaporation area a is communicated with the condensation area b, so that air can be extracted from the evaporation area a and the condensation area b through the air extraction opening H and the through opening K.

It should be noted that, if the wick structure 2 forms a closed structure in the housing 1, and the closed structure adopts a parallel structure, the closed structure may be provided with a through opening K at this time so as to be communicated with the air extraction opening H on the housing 1, so as to implement air extraction to the evaporation area a and the condensation area b through the air extraction opening H and the through opening K. It will be appreciated that if the closed structure is a serial structure, the through opening K may not be provided any more, and the air extraction opening H on the housing 1 may be directly connected to one of the evaporation area a and the condensation area b.

In the heat dissipating device of the embodiment of the present application, the first diversion wick 21, the second diversion wick 22, the reflow wick 23 and the spacer 3 mainly include the following:

1. the first diversion liquid suction core 21 can enlarge the contact area between the liquid suction core structure of the evaporation area and the cavity, improve the evaporation rate and guide the flow direction of the airflow. The first guiding wick 21 may have, but is not limited to, the following four schemes:

scheme 1-the first guiding wick 21 includes a rod-shaped guiding portion 213, where the rod-shaped guiding portion 213 may be a serial structure or a parallel structure, as shown in fig. 3A;

scheme 2-based on scheme 1, the first guiding wick 21 further includes a plurality of branch guiding portions 214, and the plurality of branch guiding portions 214 may be a serial architecture or a parallel architecture. The rod-shaped flow guiding portion 213 may be linear, as shown in fig. 4A, 5A, 8A, and 9A; alternatively, the rod-shaped flow guiding part 213 may be L-shaped, as shown in fig. 10 and 11, and the rod-shaped flow guiding part 213 in fig. 10 may be regarded as a U-shape formed by splicing two L-shapes;

Scheme 3-first guiding wick 21 comprises a plate-like body 211, plate-like body 211 being of a serial architecture, as shown in fig. 6A;

solution 4-on the basis of solution 1, the first guiding wick 21 further includes a plurality of branch portions 212, each branch portion 212 is connected to the plate-shaped body 211 and the side wall of the housing 1 on both sides in the thickness direction, and the branch portions 212 may be a serial structure or a parallel structure, as shown in fig. 7.

2. The top of the second flow-directing wick 22 in the condensing zone b (i.e., the suspended first end D1) contacts the gas flowing from the evaporation zone a in the cavity first as compared to the side of the second flow-directing wick 22 in the condensing zone b. The condensate flow direction in each secondary flow-directing wick 22 is coincident with the flow direction of the gas in the cavity. The second guiding wick 22 extending from the condensation area is not connected with the first guiding wick 21 extending from the evaporation area a, i.e. the first end D1 of the second guiding wick 22 is suspended. The second flow-directing wick 22 may have, but is not limited to, the following two schemes:

scheme 1-the second guiding wick 22 comprises a plurality of sub-wicks 221 arranged at intervals, wherein the sub-wicks 221 can be in a serial architecture or a parallel architecture, and can be in a curve type as shown in fig. 3A; may be rectilinear as shown in fig. 4A, 8A, 10 and 11; may be arcuate as shown in fig. 9A.

Scheme 2-the second flow-directing wick 22 is a plate-like structure and is a serial architecture, as shown in fig. 5A, 6A, and 7.

In addition, the second flow-directing wick 22 may be other shapes, or may be a combination of a serial structure and a parallel architecture.

3. The reflux wick 23 extends from the evaporation zone a to the condensation zone b and can absorb and transport the liquid in the condensation zone b to the evaporation zone a. The reflux wick 23 may have, but is not limited to, the following four schemes:

scheme 1-the backflow-wick 23 comprises a first backflow-wick 231 located in the middle of the casing 1, as shown in fig. 3A, 4A, 5A and 6A;

scheme 2-the backflow wick 23 comprises more than two backflow wicks 23 located in the middle of the casing 1, a third diversion wick 24 is arranged at the second end of each backflow wick 23, and the third diversion wicks 24 at the second ends of different backflow wicks 23 are arranged at intervals, as shown in fig. 7;

scheme 3-the return wick 23 comprises a second return wick 232 located on one side of the housing 1, as shown in fig. 8A;

scheme 4-the backflow wick 23 extends along the first direction and is located at one side of the evaporation zone a, one end of the third diversion wick 24 is connected with a portion of the second end of the backflow wick 23, which is close to the evaporation zone a, and the other end of the third diversion wick 24 extends along a direction away from the evaporation zone a and the backflow wick 23, as shown in fig. 9A;

Scheme 5-reflux wick 23 includes third reflux wick 233 and fourth reflux wick 234 on opposite sides of housing 1, respectively, third reflux wick 233 and fourth reflux wick 234 being located in the same condensation zone b, as shown in fig. 10;

scheme 6-reflux wick 23 includes a fifth reflux wick 235 and a sixth reflux wick 236 on opposite sides of the housing 1, respectively, the fifth reflux wick 235 and the sixth reflux wick 236 being located in different condensation zones, as shown in fig. 11.

In addition, the backflow-wick 23 may be other schemes, such as a combination of scheme 1 and scheme 2, in which the backflow-wick 23 includes a first backflow-wick 231 located in the middle of the casing 1 and a second backflow-wick 232 located on one side of the casing 1.

Further, both sides of the reflow wick 23 in the thickness direction may be respectively in contact with the side walls of the case 1, that is, the reflow wick 23 is of a parallel structure. Alternatively, one side of the reflow wick 23 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the reflow wick 23 in the thickness direction is spaced from the side wall of the housing 1, that is, the reflow wick 23 is in a serial structure, and the side of the reflow wick 23 in the thickness direction in contact with the side wall of the housing 1 may be the side close to the heat generating device or the side far from the heat generating device. In one example, if the heat-generating device is in contact with the lower cover plate 12 of the housing 1, the reflow wick 23 of the serial architecture may be disposed on the inner surface of the lower cover plate 12, i.e., 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 the vapor to flow.

Preferably, the reflow wick 23 is a parallel architecture. The rest diversion liquid absorption cores can be in a parallel structure or a serial structure. In addition, a single material may be used, a plurality of materials may be used, and only one structure may be included, or a plurality of structures may be included.

4. A spacer 3 is provided at the side of each return wick 23 facing the vapor in the direction of extension, wherein:

when the reflux wick 23 is located in the middle of the casing 1, both sides of the reflux wick 23 in the extending direction are provided with the spacers 3, respectively, as shown in fig. 3A, 4A, 5A, 6A, and 7;

when the return wick 23 is located on one side of the housing 1, the side of the return wick 23 on the side away from the housing 1 in the extending direction faces the vapor, so that it is necessary to provide the spacer 3, as shown in fig. 8A, 9A, 10 and 11.

In addition, the separator 3 provided at one side of the return wick 23 may be of an integral structure, as shown in fig. 3A, 5A, 6A, 7, 9A, 10 and 11; alternatively, the spacers 3 provided on one side of the return wick 23 may include a plurality of segments spaced apart in the extending direction of the return wick 23, as shown in fig. 4A, each spacer 3 including two segments; as shown in fig. 8A, the spacer 3 includes one segment.

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

In summary, the heat dissipation devices with serial and parallel structures, such as the cold end of the temperature equalization plate, i.e. the vapor flowing reversely in the condensation area, can carry the liquid to retain the liquid in the condensation area, which is unfavorable for condensing the liquid back to the evaporation area. According to the scheme, the first end of the second diversion liquid suction core of the condensation area, namely the top, can be preferentially contacted with gas flowing out of the evaporation area, so that the gas and liquid nearby the second diversion liquid suction core of the condensation area flow in the same direction, the carrying effect of the reverse flow of the gas and the liquid on the liquid is eliminated, the liquid return of the condensed liquid to the evaporation area is facilitated, the phenomenon of dry burning is not easy to occur, the temperature uniformity performance is improved, and the use requirement can be met under the condition that the volume of the heat dissipating device is smaller, such as the thickness is reduced.

The reflux liquid suction core with the hot end (evaporation area) extending to the cold end (condensation area) can adopt a parallel architecture and a serial architecture, and further, as the flowing direction of liquid in the reflux liquid suction core is opposite to the flowing direction of steam, a separation piece can be arranged on the side face of the reflux liquid suction core, which faces the steam along the extending direction, so that the effect of separating the steam from the liquid in the reflux liquid suction core is achieved, the phenomenon that the condensed liquid drops are detained in the condensation area due to the fact that the liquid drops are carried by the reversely flowing steam is avoided, meanwhile, the separation piece can also play a supporting role, and the structural strength is improved.

In addition, in the heat dissipating device of the embodiment of the application, the inner flow path of the cavity is simple, the opening of the inner cavity formed by the liquid suction core structure faces the extraction opening, the gas in the cavity can be rapidly extracted cleanly through the extraction opening of the evaporation area, and the gas residue is not easy to occur in the cavity of the second flow guide liquid suction core of the condensation area in the vacuumizing process, so that the uneven structure is avoided.

The last explanation is: the above embodiments are only for illustrating the technical solution of the present application, but are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat sink, comprising:

a housing (1) and a fluid working medium contained in the housing (1), wherein an inner space of the housing (1) comprises at least one group of evaporation areas (a) and condensation areas (b) which are arranged along a first direction, the first direction is perpendicular to a thickness direction of the housing (1), and the evaporation areas (a) are used for being arranged at a heating device so that the fluid working medium at the evaporation areas (a) forms steam and flows towards the condensation areas (b);

The liquid suction core structure (2) is arranged in the shell (1) and forms a steam flow channel in the shell (1), the liquid suction core structure (2) comprises a first flow guide liquid suction core (21), a second flow guide liquid suction core (22) and at least one backflow liquid suction core (23), the first flow guide liquid suction core (21) is positioned in the evaporation area (a), a first end (D1) of the second flow guide liquid suction core (22) is arranged in a suspended mode, a second end (D2) of the second flow guide liquid suction core (22) is positioned in the condensation area (b), the first end of the backflow liquid suction core (23) is connected with the first flow guide liquid suction core (21), the second end of the backflow liquid suction core (23) is connected with a second end (D2) of the second flow guide liquid suction core (22), and two sides of the backflow liquid suction core (23) in the thickness direction are respectively contacted with the side walls of the shell (1);

wherein the steam flow channel comprises a first part (P1) adjacent to the second diversion liquid suction core (22), the second diversion liquid suction core (22) comprises a plurality of sub liquid suction cores (221) which are arranged at intervals, and two sides of each sub liquid suction core (221) along the thickness direction are respectively contacted with the side wall of the shell (1); the second ends of the plurality of sub-liquid suction cores (221) are connected with the backflow liquid suction cores (23), the first ends of the plurality of sub-liquid suction cores (221) are arranged in a suspending mode, and the first part (P1) of the steam flow channel comprises a third interval space between the adjacent sub-liquid suction cores (221); the extending direction from the first end (D1) of the second diversion liquid suction core (22) to the second end (D2) of the second diversion liquid suction core (22) is consistent with the extending direction of the first part (P1) of the steam flow channel, and the first end (D1) of the second diversion liquid suction core (22) is close to the evaporation zone (a) relative to the second end (D2) of the second diversion liquid suction core (22) along the extending direction of the steam flow channel.

2. The heat sink as recited in claim 1, wherein:

a first end (D1) of the second diversion liquid suction core (22) extends to the evaporation zone (a), one end of a first part (P1) of the steam flow channel is communicated with the evaporation zone (a), and the other end of the first part (P1) of the steam flow channel extends to a second end of the backflow liquid suction core (23); or alternatively, the first and second heat exchangers may be,

the first end (D1) of the second diversion liquid suction core (22) is located in the condensation area (b), the steam flow channel further comprises a second part (P2), one end of the second part (P2) of the steam flow channel is communicated with the evaporation area (a), the other end of the second part (P2) of the steam flow channel is communicated with one end of the first part (P1) of the steam flow channel and the first end (D1) of the second diversion liquid suction core (22), and the other end of the first part (P1) of the steam flow channel extends to the second end of the backflow liquid suction core (23).

3. The heat sink according to claim 2, wherein:

the first portion (P1) of the vapor flow channel comprises at least one of a first spacing space between the backflow wick (23) and the second flow-directing wick (22) and a second spacing space between the housing (1) and the second flow-directing wick (22); and/or the number of the groups of groups,

The second portion (P2) of the vapor flow channel comprises at least one of a first spaced area between the first guiding wick (21) and the housing (1) and a second spaced area of the return wick (23) at a side facing the vapor.

4. A heat sink according to any one of claims 1-3, characterized in that the wick structure (2) further comprises:

and a third diversion liquid suction core (24) is positioned in the condensation area (b) and is connected with the second end (D2) of the second diversion liquid suction core (22) and the backflow liquid suction core (23), and the third diversion liquid suction core (24) is used for guiding the liquid in the second diversion liquid suction core (22) into the backflow liquid suction core (23).

5. The heat sink according to claim 4, characterized in that in a set of evaporation (a) and condensation (b) zones arranged in the first direction, the third guiding wick (24) extends in a second direction perpendicular to the thickness direction of the housing (1) and arranged at an angle to the first direction, the second guiding wick (22) extends from the third guiding wick (24) towards the evaporation zone (a), the first end (D1) of the second guiding wick (22) being close to the evaporation zone (a) with respect to the second end (D2) of the second guiding wick (22).

6. The heat sink as recited in claim 5, wherein:

the at least one backflow liquid suction core (23) comprises one or more than two first backflow liquid suction cores (231), the first backflow liquid suction cores (231) are located in the middle of the shell (1) along the second direction, and the second diversion liquid suction cores (22) are respectively arranged on two sides of the first backflow liquid suction cores (231); the second end of the first backflow liquid suction core (231) is connected with the middle part of the third diversion liquid suction core (24); and/or the number of the groups of groups,

the at least one backflow wick (23) comprises a second backflow wick (232), the second backflow wick (232) is located on one side of the shell (1) along the second direction, and the second diversion wick (22) is arranged on the side surface of the backflow wick (23) away from one side of the shell (1); a second end of the second backflow wick (232) is connected to one end of the third flow-directing wick (24).

7. The heat dissipation device according to claim 5, wherein the at least one reflow wick (23) comprises a third reflow wick (233) and a fourth reflow wick (234) located on both sides of the housing (1) in the second direction, respectively; the second flow-directing wick (22) is located between the third return wick (233) and the fourth return wick (234); a spacing space is arranged between the first end (D1) of the second diversion liquid suction core (22) and the first diversion liquid suction core (21) along the first direction;

Both ends of the first diversion liquid suction core (21) along the second direction are respectively connected with the first ends of the third backflow liquid suction core (233) and the fourth backflow liquid suction core (234); and two ends of the third diversion liquid suction core (24) along the second direction are respectively connected with the second ends of the third backflow liquid suction core (233) and the fourth backflow liquid suction core (234).

8. The heat sink according to claim 5, wherein the inner space of the housing (1) comprises a first evaporation zone (a 1) and a first condensation zone (b 1) arranged in a first direction and a second evaporation zone (a 2) and a second condensation zone (b 2) arranged in the first direction, the first evaporation zone (a 1) and the second condensation zone (b 2) being arranged side by side and being located at a first end of the housing (1) in the first direction; the first condensation zone (b 1) and the second evaporation zone (a 2) are arranged side by side and are located at a second end of the shell (1) along a first direction; a space is arranged between the second diversion liquid suction core (22) of the first condensation area (b 1) and the first diversion liquid suction core (21) of the second evaporation area (a 2) and the first diversion liquid suction core (21) of the first evaporation area (a 1) and the first diversion liquid suction core (21) of the second condensation area (b 2);

The at least one backflow wick (23) comprises a fifth backflow wick (235) and a sixth backflow wick (236), the fifth backflow wick (235) is located on a first side of the shell (1) along the second direction, the sixth backflow wick (236) is located on a second side of the shell (1) along the second direction, the fifth backflow wick (235) is connected with the first diversion wick (21) of the first evaporation zone (a 1) and the third diversion wick (24) of the first condensation zone (b 1), and the sixth backflow wick (236) is connected with the first diversion wick (21) of the second evaporation zone (a 2) and the third diversion wick (24) of the second condensation zone (b 2).

9. The heat sink as recited in claim 8, wherein:

-within the first condensation zone (b 1), the second guiding wick (22) decreases in length in the direction from the first evaporation zone (a 1) to the second evaporation zone (a 2);

in the second condensation zone (b 2), the second guiding wick (22) increases in length in the direction from the first evaporation zone (a 1) to the second evaporation zone (a 2).

10. The heat dissipating device according to claim 4, wherein the at least one reflow wick (23) comprises more than two reflow wicks (23) located in the middle of the housing (1) along a second direction, which is perpendicular to the thickness direction of the housing (1) and is arranged at an angle to the first direction, the second end of each reflow wick (23) is provided with the third flow guiding wick (24), and the third flow guiding wicks (24) at the second end of different reflow wicks (23) are arranged at intervals, the width of the third flow guiding wick (24) is larger than the width of the reflow wick (23), each third flow guiding wick (24) is connected to at least part of the second flow guiding wick (22).

11. The heat sink according to claim 4, wherein the condensation zone (b) extends in a direction approaching the evaporation zone (a) to a direction away from the evaporation zone (a), the backflow wick (23) extends in the first direction and is located at one side of the evaporation zone (a) in a second direction perpendicular to the thickness direction of the housing (1) and arranged at an angle to the first direction, one end of the third diversion wick (24) is connected to a portion of the second end of the backflow wick (23) approaching the evaporation zone (a), the other end of the third diversion wick (24) extends in a direction away from the evaporation zone (a) and the backflow wick (23), the second diversion wick (22) extends from the third diversion wick (24) in a direction away from the evaporation zone (a) and is curved towards the backflow wick (23), the second end (22) of the second diversion wick (22) is approaching the first end (D2) of the evaporation zone (1).

12. The heat dissipating device according to claim 1, wherein the first flow guiding wick (21) comprises a plate-like body (211), and one side of the first flow guiding wick (21) in the thickness direction is in contact with a side wall of the housing (1), and the other side of the first flow guiding wick (21) in the thickness direction is disposed at a spacing from the side wall of the housing (1).

13. The heat dissipating device according to claim 12, wherein the first flow guiding wick (21) further comprises a plurality of branch portions (212) arranged at intervals, each of the branch portions (212) being connected to the plate-like body (211) and the side wall of the case (1) on both sides in the thickness direction, respectively, and the reflow wick (23) being connected to at least one of the plate-like body (211) and the plurality of branch portions (212).

14. A heat sink according to claim 1, characterised in that the first guiding wick (21) comprises a rod-shaped guiding portion (213), the end of the rod-shaped guiding portion (213) adjacent to the condensation zone (b) in the first direction being connected to the first end of the return wick (23).

15. The heat sink as recited in claim 14 wherein:

the two sides of the rod-shaped flow guide part (213) along the thickness direction are respectively contacted with the side wall of the shell (1); or alternatively, the first and second heat exchangers may be,

one side of the rod-shaped flow guide part (213) along the thickness direction is in contact with the side wall of the shell (1), and the other side of the rod-shaped flow guide part (213) along the thickness direction is arranged at intervals with the side wall of the shell (1).

16. The heat dissipating device according to claim 14, wherein the first guiding wick (21) further comprises a plurality of branched guiding portions (214) arranged side by side and at intervals, each branched guiding portion (214) extending in a direction away from the rod-shaped guiding portion (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 side surface of the rod-shaped flow guide part (213) facing the steam along the extending direction; or alternatively, the first and second heat exchangers may be,

the rod-shaped flow guide part (213) is L-shaped, a first side of the L-shaped is connected with the backflow liquid suction core (23), and the plurality of branch flow guide parts (214) are arranged on the first side or the second side of the L-shaped and face to the inner side of the L-shaped.

17. The heat sink of claim 16 wherein the heat sink is configured to dissipate heat from the heat sink,

both sides of each branch flow guiding part (214) along the thickness direction are respectively contacted with the side wall of the shell (1); or alternatively, the first and second heat exchangers may be,

each of the branched flow guiding parts (214) is in contact with the side wall of the shell (1) along one side of the thickness direction, and the other side of each of the branched flow guiding parts (214) is arranged at intervals with the side wall of the shell (1) along the thickness direction.

18. The heat dissipating device according to claim 1, wherein the housing (1) is provided with an extraction opening (H) corresponding to one of the evaporation zone (a) and the condensation zone (b), wherein:

the extraction opening (H) is in direct communication with one of the evaporation zone (a) and the condensation zone (b); or alternatively, the first and second heat exchangers may be,

-a through opening (K) is provided on the wick structure (2) at one of the evaporation zone (a) and the condensation zone (b), through which through opening (K) the extraction opening (H) communicates with one of the evaporation zone (a) and the condensation zone (b).

19. The heat sink according to claim 1, further comprising a spacer (3), the spacer (3) being provided on a side of each of the reflow wicks (23) facing the vapor, both sides of the spacer (3) in the thickness direction being in contact with the side walls of the housing (1), respectively; wherein:

the backflow liquid suction core (23) is positioned in the middle of the shell (1), and the isolating pieces (3) are respectively arranged on two sides of the backflow liquid suction core (23); or alternatively, the first and second heat exchangers may be,

the backflow liquid suction core (23) is located on one side of the shell (1), and the isolation piece (3) is arranged on the side face, away from the shell (1), of the backflow liquid suction core (23).

20. The heat sink as recited in claim 19 wherein:

the separator (3) is integrally formed or separately formed with a side wall of one side of the housing (1) in the thickness direction; and/or the number of the groups of groups,

the separator (3) is of a unitary structure or the separator (3) comprises a plurality of segments arranged at intervals along the extension direction of the reflow wick (23).

21. A heat sink according to claim 1, characterised in that the wick structure (2) is of capillary structure; the capillary structure is formed in at least one of the following ways: braiding, sintering, etching and electroplating.

22. An electronic device, comprising:

the heat dissipation device according to any one of claims 1-21;

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