CN114727546A

CN114727546A - Heat dissipation device and electronic equipment

Info

Publication number: CN114727546A
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: 2022-07-08
Anticipated expiration: 2042-02-23
Also published as: CN114727546B; WO2023160109A1

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 position of the heating device to enable the fluid working medium to form steam and flow to the condensation area; the liquid absorption core structure is arranged in the shell, forms a steam flow channel in the shell, and comprises a first diversion liquid absorption core, a second diversion liquid absorption core and a backflow liquid absorption core, wherein the first diversion liquid absorption core is positioned in the evaporation area; the first end of the second diversion liquid absorption core is suspended and positioned in the condensation area or extends to the evaporation area, and the second end of the second diversion liquid absorption core is positioned in the condensation area; the backflow liquid suction core is connected with the second end of the second flow guide liquid suction core and the first flow guide liquid suction core; a first end of the second fluid directing wick is adjacent the evaporation zone relative to a second end of the second fluid directing wick along the vapor flow path. This application realizes steam and liquid syntropy flow, avoids the steam of reverse flow to carry liquid and makes liquid detain the condensation zone, helps returning liquid to evaporation zone, prevents to appear burning dry, has improved the reliability.

Description

Heat dissipation device 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 cell-phone, flat panel, notebook, PC, big screen etc. the electron device heating power promotes gradually along with product iteration, but the whole size of equipment, thickness are towards compact, small and exquisite orientation development, lead to the heat to gather and can't in time dispel in the equipment, make its temperature rise, not only influenced user experience, probably lead to the device high temperature to damage moreover. Therefore, various efficient heat dissipation solutions are needed to solve the problem of heat dissipation of the terminal device.

The Vapor Chamber (VC) is a vacuum chamber with a micro-nano wick structure inside and filled with fluid working medium, and is widely used for heat dissipation of electronic products. Specifically, the fluid working medium in the temperature-equalizing plate can absorb heat at a small-area heating source to form steam, so that the steam is quickly conducted to a large-area radiating surface, the purpose of efficient heat radiation is achieved, the steam can flow back to the heating source by utilizing the capillary force of the liquid absorbing core structure after being condensed into liquid, and evaporation and heat absorption are carried out again.

In the existing vapor chamber, the flow direction of vapor is opposite to the flow direction of liquid in a liquid absorption core structure, and the vapor flowing reversely may carry condensed liquid drops, so that the condensed liquid drops are retained in a condensation area, liquid return to an evaporation area for liquid supplement is not facilitated, the condition of dry burning is easy to occur, and reliable heat transfer circulation cannot be formed.

Disclosure of Invention

The embodiment of the application provides a heat abstractor and electronic equipment realizes steam and liquid cocurrent flow, avoids reverse flow's steam to carry liquid and makes liquid detain the condensation zone, helps returning liquid to the evaporation zone, can prevent to burn the dry condition, has improved product reliability.

Therefore, the embodiment of the application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a heat dissipation device, including: the internal space of the shell comprises at least one group of evaporation area and condensation area which are arranged along a first direction, the first direction is perpendicular to the thickness direction of the shell, and the evaporation area is used for being arranged at a heat generating device so that the fluid working medium at the evaporation area forms steam and flows towards the condensation area; the liquid absorption core structure is arranged in the shell and forms a steam flow channel in the shell, the liquid absorption core structure comprises a first diversion liquid absorption core, a second diversion liquid absorption core and at least one backflow liquid absorption core, the first diversion liquid absorption core is positioned in the evaporation area, the first end of the second diversion liquid absorption core is arranged in a suspended mode, the second end of the second diversion liquid absorption core is positioned in the condensation area, the first end of the backflow liquid absorption core is connected with the first diversion liquid absorption core, and the second end of the backflow liquid absorption core is connected with the second end of the second diversion liquid absorption core; the vapor flow passage comprises a first part adjacent to the second diversion liquid absorption core, the first end of the second diversion liquid absorption core extends to the direction in which the second end of the second diversion liquid absorption core extends is consistent with the extending direction of the first part of the vapor flow passage, and the first end of the second diversion liquid absorption core is opposite to the second end of the second diversion liquid absorption core and is close to the evaporation area along the extending direction of the vapor flow passage.

The heat abstractor of the embodiment of the application, the first end of second water conservancy diversion wick contacts steam earlier, make the flow direction of some steam in the space of condensation zone be from the first end of second water conservancy diversion wick to the second end of second water conservancy diversion wick, another part steam in the steam is the liquid in the condensation zone condensation, and loop through the first end of second water conservancy diversion wick, the second end of backward flow wick and the first end backward flow to the evaporation zone of backward flow wick, realize steam and liquid syntropy flow, avoid reverse flowing steam to carry liquid and make liquid detention condensation zone, help returning liquid to the evaporation zone, effectively prevent the condition of dryout, the product reliability has been improved.

In one possible implementation, the first end of the second diversion wick extends to the evaporation region, one end of the first portion of the vapor flow channel communicates with the evaporation region, 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 second water conservancy diversion wick is located the condensation zone, vapor flow path still includes the second part, the one end intercommunication of vapor flow path's second part the evaporation zone, the other end intercommunication of vapor flow path's second part the one end of vapor flow path's first part with the first end of second water conservancy diversion wick, the other end of vapor flow path's first part extends to the second end of backward flow wick. That is, in this implementation, where the first end of the second flow directing wick extends to the evaporation zone, the vapor flow passage may include only the first portion; the first end of the second flow-directing wick is located in the condensation zone and the vapor flow passage may include a first portion and a second portion.

In one possible implementation, the first portion of the vapor flow passage includes at least one of a first spacing space between the return 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 passage comprises at least one of a first spaced area between the first deflector wick and the housing and a second spaced area at a side of the return wick facing the vapor.

In one possible implementation, the second diversion wick includes a plurality of sub-wicks that the interval set up, the respective second end of a plurality of sub-wicks with the backward flow wick is connected, the respective first end of a plurality of sub-wicks is unsettled to be set up, the first part of steam flow channel includes the third interval space between the adjacent sub-wicks. That is, in this implementation, one solution of the second diversion wick includes a plurality of sub-wicks arranged at intervals, and the plurality of sub-wicks may be arranged side by side or extend in different directions respectively.

In one possible implementation, two sides of each sub-wick in the thickness direction are respectively in contact with the side walls of the shell; or, one side of each sub-wick along the thickness direction is in contact with the side wall of the housing, and the other side of each sub-wick along the thickness direction is spaced from the side wall of the housing to form a second spaced space of the vapor flow channel. That is, in this implementation, the plurality of sub-wicks may adopt a parallel architecture, that is, both sides of each sub-wick in the thickness direction are respectively in contact with the side walls of the housing; alternatively, the plurality of sub-wicks may be in a serial configuration, i.e., one side of each sub-wick in the thickness direction is in contact with the side wall of the housing, and the other side is spaced from the side wall of the housing.

In one possible implementation manner, the second flow guiding liquid absorbing core is of a plate-shaped structure, one side of the second flow guiding liquid absorbing core in the thickness direction is in contact with the side wall of the shell, and the other side of the second flow guiding liquid absorbing core in the thickness direction is arranged at intervals with the side wall of the shell to form a second interval space of the steam flow channel. That is, in this implementation, another approach to the second fluid directing wick is to use a plate-like structure. Because the plate-shaped structure generally occupies a larger space of the condensation area, in order to ensure that the 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 flow-guiding liquid suction core can be in a serial structure, namely, the other side of the second flow-guiding liquid suction core in the thickness direction is arranged at intervals with the side wall of the shell, so that the space for the steam to flow can be reserved.

In one possible implementation, the wick structure further includes: and the third flow guide liquid suction core is positioned in the condensation area, is connected with the second end of the second flow guide liquid suction core and the backflow liquid suction core, and is used for guiding the liquid in the second flow guide liquid suction core to the backflow liquid suction core. That is, in this implementation, in order to facilitate the connection of the second flow guide wick and the return wick, a third flow guide wick may be provided between the second flow guide wick and the return wick, and the third flow guide wick may function to collect the liquid in the second flow guide wick so as to guide the liquid in the second flow guide wick to the return wick.

In one possible implementation, in a set of evaporation area and condensation area that follow the first direction is arranged, third water conservancy diversion wick extends along the second direction, the second direction perpendicular to the thickness direction of casing, and with first direction angulation sets up, second water conservancy diversion wick follows third water conservancy diversion wick department towards the evaporation area extends, the first end of second water conservancy diversion wick is relative the second end of second water conservancy diversion wick is close to the evaporation area. That is to say, in this implementation, the extending direction of third water conservancy diversion wick can select with the extending direction cooperation of second water conservancy diversion wick, and third water conservancy diversion wick extends like the width direction of casing along the second direction, and second water conservancy diversion wick can extend like the length direction of casing along the first direction, compares in the parallel framework wick design scheme of gas-liquid reverse flow, can make vapor channel's gas flow path shorten, and flow resistance reduces, and the samming performance is better.

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

In one possible implementation, the at least one return wick includes a third return wick and a fourth return wick that are respectively located on both sides of the housing along the second direction; the second diversion wick is located between the third return wick and the fourth return wick; a spacing space is arranged between the first end of the second flow guide liquid suction core and the first flow guide liquid suction core along the first direction; 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 the second ends of the third backflow liquid suction core and the fourth backflow liquid suction core. That is to say, in this implementation, the quantity of backward flow wick can be two, and be located the both sides along the second direction of casing respectively, and steam flows to the condensation zone by the evaporation zone between two backward flow wicks to because the unsettled first end of second water conservancy diversion wick contacts steam earlier, liquid after the steam condensation like this moves to the second end by first end in second water conservancy diversion wick, and the flow direction is the same with steam.

In a possible implementation manner, the inner space of the casing includes a first evaporation area and a first condensation area which are arranged along a first direction, and a second evaporation area and a second condensation area which are arranged along the first direction, and the first evaporation area and the second condensation area are arranged side by side and are located at a first end of the casing along the first direction; the first condensation zone and the second evaporation zone are arranged side by side and are positioned at a second end of the shell along a first direction; a spacing space is arranged between the second diversion liquid absorption core of the first condensation area and the first diversion liquid absorption core of the second evaporation area and between the first diversion liquid absorption core of the first evaporation area and the first diversion liquid absorption core of the second condensation area; at least one backward flow wick includes fifth backward flow wick and sixth backward flow wick, fifth backward flow wick is located the edge of casing the first side of second direction, sixth backward flow wick is located the edge of casing the second side of second direction, fifth backward flow wick is connected the first water conservancy diversion wick in first evaporation zone and the third water conservancy diversion wick in first condensation zone, sixth backward flow wick is connected the first water conservancy diversion wick in second evaporation zone and the third water conservancy diversion wick in second condensation zone. That is to say, in this implementation, the internal space of the housing may be provided with a first group of evaporation area and condensation area, that is, a first evaporation area and a first condensation area, and may also be provided with a second group of evaporation area and condensation area, that is, a second evaporation area and a second condensation area, where the first evaporation area may correspond to the first heat generating device, and the second evaporation area may correspond to the second heat generating device, so that the heat generating device is applicable to a scenario with a plurality of heat generating devices.

In one possible implementation, in the first condensation zone, the length of the second guide wick decreases in the direction from the first evaporation zone to the second evaporation zone; in the second condensation zone, the second fluid directing wick increases in length in a direction from the first evaporation zone to the second evaporation zone. That is, in this implementation, the first end of the second flow guide wick of the first condensation area forms an inclined structure, the first end of the second flow guide wick of the second condensation area forms an inclined structure, and the two inclined structures may be arranged in parallel and at an interval to form an interval space.

In a possible implementation, at least one backward flow wick includes and is located along the second direction backward flow wick more than two at the middle part of the casing, the second direction perpendicular to the thickness direction of casing, and with the first direction angle sets up, every the second end of backward flow wick is provided with third water conservancy diversion wick, and the third water conservancy diversion wick interval of the second end department of different backward flow wicks sets up, the width of third water conservancy diversion wick is greater than the width of backward flow wick, every third water conservancy diversion wick is connected to a small part the second water conservancy diversion wick. That is to say, in this implementation, can set up a plurality of backward flow imbibitions cores in the middle part of the edge second direction of casing, the second end of backward flow imbibition core can set up a third water conservancy diversion imbibition core, but the third water conservancy diversion imbibition core of the second end department of different backward flow imbibition cores interval sets up to connect the second water conservancy diversion imbibition core of different positions department, make the liquid in the second water conservancy diversion imbibition core of different positions department can get into corresponding backward flow imbibition core through the third water conservancy diversion imbibition core of connection respectively.

In one possible embodiment, the condensation zone extends outwardly in a direction from close to the evaporation zone to far away from the evaporation zone, the return wick extends in the first direction and is located on one side of the evaporation region in a second direction perpendicular to the thickness direction of the housing, and is arranged at an angle with the first direction, one end of the third diversion liquid absorption core is connected with the part of the second end of the backflow liquid absorption core close to the evaporation area, the other end of the third diversion liquid absorption core extends along the direction far away from the evaporation area and the backflow liquid absorption core, the second fluid directing wick extends from the third fluid directing wick in a direction away from the evaporation region and curves toward the return wick, the second end of the second flow guiding liquid absorption core is close to the evaporation area relative to the first end of the second flow guiding liquid absorption core. That is, in this implementation, if the width of the condensation area is greater than that of the evaporation area, the shape of the third flow-guiding wick may be deformed according to the shape of the condensation area, for example, the return wick extends in the first direction, and the third flow-guiding wick extends in a direction away from the evaporation area and the return wick, at this time, the shape of the second flow-guiding wick may also be deformed according to the shape of the condensation area, for example, the shape of the second flow-guiding wick may be an arc.

In one possible implementation manner, the first flow guiding wick includes a plate-shaped main body, and the first flow guiding wick is along one side of the thickness direction and in contact with the side wall of the housing, and the first flow guiding wick is along the other side of the thickness direction and at an interval with the side wall of the housing. That is, in this implementation, one solution of the first flow-guiding wick is to include a plate-shaped main body, and since the area of the plate-shaped main body is generally large, the first flow-guiding wick may adopt a serial architecture, that is, one side of the first flow-guiding wick in the thickness direction contacts with 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 area to flow.

In a possible implementation manner, the first guide wick further includes a plurality of branch portions arranged at intervals, two sides of each branch portion in the thickness direction are respectively connected to the plate-shaped main body and the side wall of the housing, and the return wick is connected to at least one of the plate-shaped main body and the plurality of branch portions. That is to say, in this implementation, the first fluid guiding wick includes a plate-shaped main body and a plurality of branch portions, and a scheme combining serial and parallel connection may be adopted, so that the area of the first fluid guiding wick may be increased, which is beneficial to enabling the liquid inside the first fluid guiding wick to absorb heat as soon as possible to form vapor.

In one possible implementation, the first diversion wick includes a rod-shaped diversion portion, and an end portion of the rod-shaped diversion portion, which is close to the condensation area along the first direction, is connected to the first end of the backflow wick. That is, in this implementation, another version of the first fluid-directing wick is to include a rod-shaped fluid-directing portion. The shape of the rod-shaped flow guide part can be flexibly selected according to the extending direction of the reflux liquid absorption core and the space shape of the evaporation area, and the shape of the rod-shaped flow guide part can be a straight line shape, an L shape or a U shape.

In a possible implementation manner, two sides of the rod-shaped flow guide part along the thickness direction are respectively in contact with the side wall of the shell; or, the rod-shaped flow guide part is contacted with the side wall of the shell along one side of the thickness direction, and the other side of the rod-shaped flow guide 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 in a parallel configuration or in a serial configuration.

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

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

In a possible implementation manner, a pumping port is provided on the housing, and the pumping port corresponds to one of the evaporation area and the condensation area, wherein: the pumping port is directly communicated with one of the evaporation zone and the condensation zone; or a through opening is arranged on the wick structure at one of the evaporation area and the condensation area, and the pumping 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 air pumping port may be disposed on the housing to pump air from the evaporation region and the condensation region. And if the wick 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 suction opening on the shell, and then the evaporation area and the condensation area are sucked through the air suction opening. It will be appreciated that if the enclosure is of a serial configuration, the through opening may no longer be provided and the extraction opening in the housing may be in direct communication with one of the evaporation and condensation zones.

In one possible implementation, two sides of the reflux wick in the thickness direction are respectively in contact with the side walls of the shell; or, the edge of backward flow wick one side of thickness direction with the lateral wall contact of casing, the edge of backward flow wick the opposite side of thickness direction with the lateral wall interval of casing sets up. That is, in this implementation, the return wick may be in a parallel architecture or in a serial architecture.

In a possible implementation manner, the heat dissipation device further includes a spacer, the spacer is disposed on a side surface of each return wick facing the vapor, and two sides of the spacer in the thickness direction are respectively in contact with the side walls of the housing; wherein: the backflow liquid absorbing core is positioned in the middle of the shell, and the isolating parts are respectively arranged on two sides of the backflow liquid absorbing core; or, the backflow liquid absorbing core is positioned on one side of the shell, and the side face, far away from one side of the shell, of the backflow liquid absorbing core is provided with the isolating piece. That is, in this implementation, since the liquid in the return wick flows in a direction opposite to the direction of the vapor in the internal space/cavity of the housing, in order to avoid the vapor flowing in the reverse direction from carrying the liquid in the return wick and causing the liquid to stagnate in the condensation area, which is detrimental to the liquid return to the evaporation area for liquid replenishment, a spacer may be provided on the side of the return wick facing the vapor.

In one possible implementation, the spacer is integrally or separately formed with a side wall of one side of the housing in the thickness direction; and/or the separator is of an integral structure or comprises a plurality of segments which are arranged at intervals along the extending direction of the reflux liquid suction core. That is, in this implementation, in order to simplify the mounting procedure, 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 may be of an integral structure; in order to reduce the installation difficulty, the isolating piece can be formed by being separated from the shell, and the isolating piece can comprise a plurality of sections.

In one possible implementation, the wick structure is a capillary structure; the capillary structure is formed in a manner including at least one of: weaving, 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 a plated 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 by the first aspect; and the heating device is arranged corresponding to the evaporation area of the heat dissipation device and in contact with the shell 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 diagram of a wick structure employing a vapor chamber of a serial architecture;

FIG. 1B is a schematic diagram of an exemplary embodiment of the vapor chamber shown in FIG. 1A;

FIG. 2A is a schematic diagram of a wick structure employing a vapor chamber of a parallel architecture;

FIG. 2B is a schematic diagram of an exemplary embodiment of the vapor chamber shown in FIG. 2A;

fig. 3A is a schematic top view illustrating the heat dissipation device according to the first embodiment of the present application with the upper cover plate removed;

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

fig. 4A is a schematic top view illustrating a heat dissipation device according to a second embodiment of the present application with an upper cover plate removed;

FIG. 4B is a schematic cross-sectional view of the heat dissipation device 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 dissipation device shown in FIG. 4A;

FIG. 5B is a schematic cross-sectional view of the heat sink shown in FIG. 5A taken along line A-A and line B-B;

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

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

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

fig. 8A is a schematic top view illustrating a heat dissipation device provided in a third embodiment of the present application with an upper cover plate removed;

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

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

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

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

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

fig. 12 is a schematic top view of a heat dissipation device with an upper cover plate 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 orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, an interference connection, or an integral connection; the two components can be directly connected or indirectly connected, and the indirect connection between the two components can mean that the two components are connected through a third component; the specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The temperature equalizing plate can quickly conduct the heat of a small-area heating source to a large-area radiating surface, so that the purpose of efficient radiating is achieved. The working mechanism of the heat pump type heat pump device is that the characteristics of heat absorption and heat release by condensation of fluid working media in boiling are utilized, and the effect of quickly conveying the heat at the hot end to the cold end through steam flow is realized.

The temperature equalizing plate mainly comprises a shell and a liquid absorbing core such as a capillary structure, a fluid working medium and the like. The liquid in the liquid absorption core absorbs heat, and steam generated by evaporation and boiling enters the cavity; the gas flows to a condensation area with lower temperature in the cavity to release heat, the gas is condensed into liquid drops, and the liquid is absorbed by the liquid absorption core again and flows to the evaporation area under the action of capillary force. That is, the evaporation area is the area where the heat dissipation device such as the vapor chamber is attached to the heat source, and the evaporation area absorbs the heat of the heat source, so that the internal liquid working medium is evaporated into gas and enters the cavity channel. The condensation zone is a large heat dissipation area of a heat dissipation device such as a temperature equalization plate, gas in a cavity in the condensation zone is condensed to release heat, and condensed liquid is absorbed by a wick structure such as a capillary structure.

Wherein the housing may include an upper cover plate and a lower cover plate. Wick structures in the vapor chamber can be divided into serial and parallel architectures depending on whether the wick structure, e.g., capillary, is in direct contact with the respective inner surfaces of the upper and lower cover plates.

Fig. 1A is a schematic structural diagram of a wick structure employing a vapor chamber of a serial architecture. In the serial architecture, as shown in fig. 1A, the wick, i.e., the wick, does not simultaneously engage the respective inner surfaces of the upper and lower cover plates, leaving a vapor-permeable cavity between the wick and the cover plates.

Fig. 1B is a schematic diagram of an exemplary specific structure of the vapor chamber shown in fig. 1A. As shown in fig. 1B, the fluid working medium (not shown) at the hot end absorbs heat to form gas, and moves towards the cold end in the cavity above, the gas condenses at the cold end to release heat, and the formed liquid enters the capillary and moves towards the hot end under the action of the capillary force so as to evaporate and absorb heat again. It can be seen that the direction of gas flow in the cavity is from hot end to cold end; the liquid flow direction in the capillary is from cold end to hot end, i.e. the flow direction of gas and liquid is opposite.

Fig. 2A is a schematic structural diagram of a temperature equalization plate with a parallel wick structure. As shown in fig. 2A, in a side-by-side configuration, multiple wicks, or capillaries, may be included, supported in direct abutment with the respective inner surfaces of the upper and lower cover plates, with the liquid and gas within the capillaries entering and exiting only through the sides. At this time, the capillaries may function to support the upper and lower cover plates.

Fig. 2B is a schematic diagram of an exemplary specific structure of the vapor chamber shown in fig. 2A. In fig. 2B, the left side view is a top view of the vapor chamber 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, the other end is located at the cold end, and both sides of each capillary in the thickness direction are in contact with the upper cover plate and the lower cover plate, that is, the parallel framework is obtained. The fluid working medium (not shown in the figure) at the hot end absorbs heat, moves towards the cold end in the space between the adjacent capillaries, enters the other end of the capillary after the cold end is condensed into liquid, and moves towards the hot end under the action of capillary force.

Because the wick structure, namely 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 be evaporated from the side surface of the capillary, and the evaporation area is smaller. When the power consumption is increased, the evaporation thermal resistance and the pressure drop of vapor circulation are large, so that the temperature equalizing performance of the temperature equalizing plate is poor. And, the flow direction of the liquid in the capillaries (see cross-sectional view a-a) is opposite to the flow direction of the vapor/gas in the spaces between adjacent capillaries (see cross-sectional view B-B).

With the ultra-thin development of terminal electronic equipment, the thickness of the temperature-uniforming plate is designed to be smaller and smaller. Conventional serial wick structure designs, while reducing thickness, will simultaneously compress the thickness of the wick and vapor cavity, resulting in a significant increase in gas and liquid flow resistance of the vapor chamber. Although the parallel structure generates a larger thickness space of the liquid absorbing core and the vapor cavity compared with the serial structure, the liquid returning amount of the liquid absorbing core structure is small due to the small cross section area of the liquid absorbing core structure, and the liquid absorbing core is not easy to contact with the vapor or the condensed liquid due to the large width of the vapor cavity channel, so that the liquid returning of the liquid absorbing core is not facilitated, and the liquid is easy to burn out. In addition, the theoretical maximum temperature difference value of the temperature-equalizing plate is increased due to the large pressure difference in the steam cavity. 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 parallel-framework wick design easily causes the overlong length of a steam cavity channel and the overhigh pressure drop, so that the saturation temperature difference of steam is increased, and the temperature equalizing performance of a temperature equalizing plate is reduced.

In addition, the conventional serial and parallel wick structure design, the steam in the inside cavity contacts with the liquid in the wick, the gas flowing direction in the cavity is opposite to the liquid backflow direction in the wick structure, the liquid drops can be carried by the reverse flowing, namely, the liquid on the surface of the entrainment wick structure can be carried by the high-speed flowing gas, so that the condensed liquid drops are retained in a condensation area, the liquid is not beneficial to returning the liquid to an evaporation area for liquid supplement, the liquid return in the evaporation area is not timely, thereby the drying is realized, and the uniform temperature plate is made to lose efficacy. Therefore, a special wick and vapor cavity channel structure needs to be designed to promote the phase change transportation of gas and liquid and form reliable heat and mass transfer circulation.

In view of this, the present application provides a heat dissipation device and an electronic apparatus. The electronic equipment comprises a heating device and a heat dissipation device. The heating device is arranged corresponding to the evaporation area of the heat dissipation device and in contact with the shell of the heat dissipation device. In the embodiment of the present application, the "contact" may be a direct contact or an indirect contact, for example, other components such as a glue layer may be disposed between the heat generating device and the housing of the heat dissipating device to achieve 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, can be applied to terminal electronic equipment such as a mobile phone, and is mainly used for efficiently dissipating heat of high-temperature components.

The liquid drop that causes has solved the interior gas-liquid reverse flow of vapor chamber at the heat abstractor of this application embodiment carries the problem, has improved the overall arrangement of inside wick structure and cavity, can realize that steam and liquid syntropy flow, avoids the steam of reverse flow to carry liquid, makes liquid be detained the condensation zone, helps returning liquid to the evaporation zone, promotes the reliability of capillary liquid return, effectively prevents to appear burning dry the condition.

Fig. 3A is a schematic top view of the heat dissipation device provided in the first embodiment of the present application with the upper cover plate removed. Fig. 3B is a schematic cross-sectional view of the heat dissipation device shown in fig. 3A at a line a-a. As shown in fig. 3A and 3B, the heat dissipation device includes a housing 1, a fluid working medium (not shown in the drawings) accommodated 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 located 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, 12, or the annular support structure 13 may be separately formed from the upper and

lower cover plates

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

The liquid absorbing core structure can be a porous liquid absorbing core structure, the surface tension of fluid is dominant for the flow in pores, and the capillary force generated by the liquid absorbing core can absorb liquid drops formed by condensation in the cavity and drive the seepage of the liquid in the liquid absorbing core. The wick structure may be a capillary structure; the capillary structure is formed in a manner including at least one of: weaving, 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 a plated material. In addition, the specific structure of the capillary structure may include a plurality of groove structures and a plurality of protrusion structures, and the plurality of groove structures and the plurality of protrusion structures may be formed by etching, for example.

As shown in fig. 3A, the inner space of the housing 1 includes at least one set of an evaporation area a and a condensation area b arranged along a first direction, the evaporation area a is used for being arranged at the heat generating device, so that the fluid working medium at the evaporation area a forms steam and flows towards the condensation area b. The first direction is perpendicular to the thickness direction of the housing 1, and the first direction may be, for example, a length direction or a width direction of the housing 1. It is understood that the first direction may also be other directions of the housing 1 than the length direction and the width direction. The following description will be given mainly taking 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 communicated, 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 fluid directing wick 21, a second fluid directing wick 22, and at least one return wick 23. First water conservancy diversion wick 21 is located evaporation zone a, and the unsettled setting of first end D1 of second water conservancy diversion wick 22 is located condensation zone b or extends to evaporation zone a, and the second end D2 of second water conservancy diversion wick 22 is located condensation zone b, and the first end and the first water conservancy diversion wick 21 of backward flow wick 23 are connected, and the second end D2 of second water conservancy diversion wick 22 of backward flow wick 23 are connected.

It should be noted that "suspended" herein means that the first end D1 of second fluid directing wick 22 is a hollow cavity of the housing, and no other components are provided. Or, the "suspended arrangement" means that the first end D1 of the second diversion wick 22 is arranged at equal intervals with other components in the housing 1, such as the first diversion wick 21, the return wick 23, and the partition 3, and an interval space is arranged between the first end D1 of the second diversion wick 22 and other components. In one example, a "floating arrangement" may be where the end surface of first end D1 of second fluid directing wick 22 is within or in contact communication with the cavity; in another example, a "suspended arrangement" may be one in which the first end D1 of second fluid directing wick 22 has a cavity on both its end and sides, or is in contact communication with a cavity.

In fig. 3A, the inner space of the casing 1 includes a set of evaporation areas a and condensation areas b arranged in a first direction. The first guide wick 21 includes a rod-shaped guide portion 213, and an end portion of the rod-shaped guide portion 213 close to the condensation area b in the first direction is connected to the first end of the return wick 23. In one example, two sides of the rod-shaped flow guide portion 213 in the thickness direction are respectively in contact with the side wall of the housing 1, that is, the rod-shaped flow guide portion 213 is parallel; or, in another example, one side of the rod-shaped flow guide portion 213 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the rod-shaped flow guide portion 213 in the thickness direction is spaced apart from the side wall of the housing 1. Among them, the side walls of the case 1 that contact both sides of the wick structure 2 such as the rod-like flow guide 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 case 1 that contacts one side of wick structure 2 such as rod-shaped flow guide 213 in the thickness direction refers to the inner surface of upper cover plate 11 or the inner surface of lower cover plate 12.

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

scheme 1-as shown in fig. 3A, the first end D1 of the second fluid-conducting 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 the second fluid-conducting wick 22. One end of the second portion P2 of the vapor flow path communicates with the evaporation area a, the other end of the second portion P2 of the vapor flow path communicates with one end of the first portion P1 of the vapor flow path and the first end D1 of the second guide wick 22, and the other end of the first portion P1 of the vapor flow path extends to the second end of the return wick 23.

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

That is, the first end D1 of the second fluid directing wick 22 that is suspended may be located in the condensation area b, as shown in fig. 3A, when the vapor flow path includes the second portion P2 and the first portion P1 adjacent to the second fluid directing wick 22. If desired, the first suspended end of second fluid-directing wick 22 may also extend to evaporation area a, in which case the vapor flow path may include only first portion P1 adjacent to second fluid-directing wick 22.

With continued reference to fig. 3A, second diverting wick 22 may include a plurality of sub-wicks 221 spaced apart from one another, with second ends of each of the plurality of sub-wicks 221 coupled to return-flow wick 23, first ends of each of the plurality of sub-wicks 221 suspended in air, and first portion P1 of the vapor flow path including third spaced-apart spaces between adjacent sub-wicks 221. Moreover, two sides of each sub-wick 221 along the thickness direction can be respectively contacted with the side wall of the shell 1, that is, the second diversion wick 22 is a parallel framework at this time; alternatively, one side of each sub-wick 221 in the thickness direction is in contact with the sidewall of the housing 1, and the other side of each sub-wick 221 in the thickness direction is spaced from the sidewall of the housing 1 to form a second spaced space of the vapor flow channel, where the second guide wick 22 is a serial structure.

Additionally, the first portion of vapor flow passage P1 may include at least one of a first spacing between return wick 23 and second flow directing wick 22 and a second spacing between housing 1 and second flow directing 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 provided at a distance from the return wick 23 (or a spacer 3 to be described later) to form a first space; the outermost sub-wick 221 is spaced from the annular support structure 13 of the housing 1 to form a second spaced-apart space.

Also, second portion P2 of the vapor flow path may include at least one of a first spaced area between first fluid directing wick 21 and housing 1 and a second spaced area at the vapor facing side of return wick 23 (where it is not adjacent to second fluid directing wick 22). As shown in fig. 3A, the first fluid guiding wick 21 is spaced from the annular support structure 13 of the housing 1 by a rod-shaped fluid guiding portion 213 to form a first spaced area; the region between evaporation zone a and first portion P1 of the vapor flow path, the vapor-facing side of return wick 23 is spaced from annular support structure 13 of housing 1 to form a second spaced region.

Further, the direction in which the first end D1 of the second fluid-directing wick 22 extends to the second end D2 of the second fluid-directing wick 22 coincides with the direction in which the first portion of the vapor flow path extends, and the first end D1 of the second fluid-directing wick 22 is located closer to the evaporation area a than the second end D2 of the second fluid-directing wick 22 along the direction in which the vapor flow path extends. By "extending in a consistent direction" it is meant that the second fluid directing wick 22 extends in a direction substantially the same as the direction of extension of the first portion of the vapor flow passageway P1, with the second fluid directing wick 22 extending generally in the direction of extension of the first portion of the vapor flow passageway P1.

The direction of extension of the second fluid directing wick 22 may thus be arranged: such that in the second fluid-directing wick 22, a portion of the second fluid-directing wick 22 that is closer to the first end D1 of the second fluid-directing wick 22 in the direction of extension of the second fluid-directing wick 22 contacts the vapor first, relative to a portion of the second fluid-directing wick 22 that is farther from the first end D1. That is, the extending direction of the second flow-guiding wick 22 is set such that a part of the vapor flows in the space of the condensation area b from the first end D1 of the second flow-guiding wick 22 to the second end D2 of the second flow-guiding wick 22, and another part of the vapor condenses into a liquid in the condensation area b and may flow back to the evaporation area a through the first end D1 of the second flow-guiding wick 22, the second end D2 of the second flow-guiding wick 22, the second end of the return wick 23, and the first end of the return wick 23 in this order.

Because the suspended first end of the second diversion liquid absorption core 22 contacts with the steam first, the liquid after the steam condensation enters the suspended first end D1 of the second diversion liquid absorption core 22 first, and then moves to the second end D2 of the second diversion liquid absorption core 22 under the action of the capillary force, namely the flow direction of the condensed liquid in the second diversion liquid absorption core 22 is from the suspended first end D1 of the second diversion liquid absorption core 22 to the second end D2 of the second diversion liquid absorption core 22, and is the same as the flow direction of the steam (from the suspended first end D1 of the second diversion liquid absorption core 22 to the second end D2 of the second diversion liquid absorption core 22), namely the steam and the liquid flow in the same direction are realized, the liquid can be prevented from being carried by the steam flowing reversely, the liquid is retained in the condensation area b, the liquid is returned to the evaporation area a, the dry-out condition is prevented effectively, and the reliability of the product is improved.

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

Since the flow direction of the liquid in the reflux wick 23 (from the condensation area to the evaporation area) is opposite to the flow direction of the vapor in the inner space of the housing 1 (from the evaporation area to the condensation area), the liquid droplets may be carried by the reverse flow, and the condensed liquid droplets are retained in the condensation area, which is not favorable for returning the liquid to the evaporation area for liquid replenishment. In order to isolate the vapour from the liquid in return wick 23, the heat sink may further comprise spacers 3, spacers 3 being arranged on the side of each return wick 23 facing the vapour. In fig. 3A, reflux liquid suction core 23 is located in the middle of housing 1, and spacers 3 are respectively disposed on both sides of reflux liquid suction core 23.

Wherein, two sides of the separator 3 along the thickness direction are respectively contacted with the side walls of the shell 1, so that the separator 3 and the shell 1 can form a relatively closed space for accommodating the reflux wick 23. The separator 3 is used for isolating the liquid in flowing gas and the backward flow wick 23 in the cavity, prevents that the liquid in the backward flow wick 23 is carried to the steam in the inner space of the casing 1, makes the condensation liquid drop be detained in the condensation zone b, and the separator 3 can play the effect of supporting the casing 1 simultaneously, helps promoting structural strength.

Further, for convenience of mounting, the spacer 3 may be integrally formed with a 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. If necessary, the spacer 3 may be formed separately from the side walls of the case 1 on one side in the thickness direction, i.e., the upper cover plate 11 and the lower cover plate 12, and may be connected to the upper cover plate 11 and the lower cover plate 12 by bonding/welding.

As shown in fig. 3A, return wick 23 is a straight line, and spacer 3 may be a unitary structure. In addition, each sub-capillary 231 of second fluid directing wick 22 is a curvilinear structure; alternatively, second fluid-directing wick 22 may have other shapes, such as a straight shape (see fig. 4A, discussed below) or an arcuate shape (see fig. 9A, discussed below).

Fig. 4A is a schematic top view of the heat dissipation device provided in the second embodiment of the present application with the upper cover plate removed. As shown in fig. 4A, wick structure 2 may also include a third fluid directing wick 24. The third diversion wick 24 is located in the condensation area b, and is connected to the second end D2 of the second diversion wick 22 and the return wick 23, and the third diversion wick 24 is used to guide the liquid in the second diversion wick 22 into the return wick 23, that is, the third diversion wick 24 is used to collect the condensate in the second diversion wick 22. Furthermore, since the vapor at the end of the condensation area b far from the evaporation area b is easily condensed into liquid, or more liquid is formed at this point, the third guide wick 24 may be disposed at this point so as to guide the liquid at this point to the return wick 23.

The extending direction of the third fluid guiding wick 24 and the extending direction of the second fluid guiding wick 22 can be designed according to specific work requirements. In fig. 4A, third flow-directing wick 24 extends in a second direction, perpendicular to the thickness direction of housing 1, and at an angle to the first direction, in a set of evaporation area a and condensation area b aligned in the first direction. For example, the second direction is a width direction or a length direction of the housing 1. It is understood that the second direction may also be other directions of the housing 1 than the length direction and the width direction. In the embodiment of the present application, 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, in this case, the first direction and the second direction form an angle of 90 degrees, that is, the first direction and the second direction are perpendicular to each other. The second fluid directing wick 22 extends from the third fluid directing wick 24 toward the evaporation area a, and the first end D1 of the second fluid directing wick 22 is proximate the evaporation area a relative to the second end D2 of the second fluid directing wick 22. At this point, second fluid directing wick 22 may extend in a first direction. Also, among the plurality of sub-wicks 221 of the second guide wick 22 on the return wick 23 side, the first end of the sub-wick 221 located at the middle position may extend beyond the first ends of the sub-wicks 221 located at both sides.

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

Further, the at least one reflux wick 23 can include one or more than two first reflux wicks 231. In fig. 4A, return wick 23 includes only one first return wick 231. The first reflux liquid absorption core 231 is located in the middle of the shell 1 along the second direction, and the two sides of the first reflux liquid absorption core 231 are respectively provided with a second diversion liquid absorption core 22; the second end of first return wick 231 is connected to the middle of third guide wick 24. The return liquid suction core 23 is provided with separators 3 on both sides in the second direction. The return wick 23 includes a bent multi-stage structure, and each of the separators 3 may include a plurality of stages arranged at intervals in the extending direction of the return wick 23.

In addition, in fig. 4A, the first portion P1 of the vapor flow passage includes a first spacing space between the return wick 23 and the second diversion wick 22, that is, the innermost sub-wick 221, a second spacing space between the housing 1 and the second diversion wick 22, that is, the outermost sub-wick 221, and a third spacing space between adjacent sub-wicks 221. The second part P2 of the vapour flow path comprises a first spaced-apart region between the first guide wick 21 and the annular support structure 13 of the casing 1 and a second spaced-apart region at the vapour-facing side of the return wick 23 (the part not adjacent to the second guide wick 22).

Fig. 4B is a schematic cross-sectional view of the heat dissipation device shown in fig. 4A at a line a-a, a line B-B, and a line C-C. In fig. 4B, as can be seen from the sectional view a-a, the first flow-guiding wick 21 (including the rod-shaped flow-guiding portion 213 and the plurality of branch flow-guiding portions 214) of the evaporation area a adopts a parallel structure; as can be seen from the sectional view B-B, the return wick 23 adopts a parallel architecture; as can be seen from the C-C sectional view, the second diversion wick 22 of the condensation area b adopts a parallel structure; i.e. the wick structure 2 may all be designed in a parallel architecture. It is understood that the first fluid directing wick 21, the second fluid directing wick 22 and the return wick 23 may be in a serial configuration or one of them may be in a serial configuration and the other in a parallel configuration.

The heat dissipation device of the second embodiment of the present application, the unsettled first end D1 of second water conservancy diversion wick 22 contacts steam earlier, and the flow direction of liquid is the same with the flow direction of gas in the cavity in the second water conservancy diversion wick of condensation zone b also can be realized to it carries the hindrance effect to the backward flow to have eliminated the liquid droplet, and it is littleer to make the steam flow pressure drop in the cavity, has promoted the temperature uniformity.

Fig. 5A is a schematic top view of a variation of the heat dissipation device shown in fig. 4A. The difference from the heat dissipation device shown in fig. 4A is that, in fig. 5A, the second guide wick 22 is a plate-shaped structure, one side of the second guide wick 22 in the thickness direction contacts with the sidewall of the housing 1, and the other side of the second guide wick 22 in the thickness direction is spaced from the sidewall of the housing 1 to form a second spaced space of the vapor flow channel, where the second guide wick 22 is a serial architecture. Because the second guide liquid absorbing core 22 generally occupies a larger space of the condensation area when being in a plate-shaped structure, in order to ensure that the vapor 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 guide liquid absorbing core 22 can select a serial framework, so that the other side of the second guide liquid absorbing core 22 in the thickness direction is arranged at intervals with the side wall of the shell 1, and a space for the vapor 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 diversion wick 22 has a plate-shaped structure, and the first portion P1 of the vapor flow passage may include a first spacing space between the return wick 23 and the second diversion wick 22, a second spacing space between the annular support structure 13 of the housing 1 and the second diversion wick 22, and a second spacing space between one side of the second diversion wick 22 in the thickness direction and the side wall of the housing 1, that is, the upper cover plate 11 or the lower cover plate 12. The second part P2 of the vapour flow path comprises a first spaced-apart region between the first guide wick 21 and the annular support structure 13 of the casing 1 and a second spaced-apart region at the vapour-facing side of the return wick 23 (where the second guide wick 22 is not provided).

Fig. 5B is a schematic cross-sectional view of the heat dissipation device shown in fig. 5A at a line a-a and a line B-B. As shown in fig. 5B, the second diversion wick 22 in the condensation area B is in a serial architecture, and the return wick 23 is in a parallel architecture, that is, the wick structures 2 are in a serial-parallel combination. The flow direction of the reflux condensate in the second diversion wick 22 of the condensation area b is the same as the flow direction of the vapor in the cavity, and the reflux condensate flows from the evaporation area a to the condensation area b.

Fig. 6A is a schematic top view of a variation of the heat dissipation device shown in fig. 5A. The difference from the heat dissipation device shown in fig. 5A is that, in fig. 6A, the first flow-guiding wick 21 includes a plate-shaped main body 211, one side of the first flow-guiding wick 21 in the thickness direction contacts with a sidewall of the housing 1, and the other side of the first flow-guiding wick 21 in the thickness direction is spaced from the sidewall of the housing 1, that is, the first flow-guiding wick 21 is a serial architecture.

In addition, in fig. 6A, the first portion P1 of the steam flow path has the same structure as in fig. 5A. The second part P2 of the vapour flow path comprises a first spaced area between the first flow-directing wick 21 and the upper or

lower cover plate

11, 12 of the casing 1 and a second spaced area at the side of the return wick 23 (where the second flow-directing wick 22 is not located) facing the vapour.

Fig. 6B is a schematic cross-sectional view of the heat dissipation device shown in fig. 6A at a line a-a. As shown in fig. 6B, the first guide liquid-guiding wick 21 and the second guide liquid-guiding wick 22 are in a serial architecture, and the third guide liquid-guiding wick 24 is in a parallel architecture, that is, the wick structures 2 are in a serial-parallel combination manner.

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

That is, the wick structure 2 is combined in series-parallel, specifically, the first guide wick 21 of the evaporation area a is combined in series-parallel, the second guide wick 22 of the condensation area b is combined in series, and the return wick 23 may be combined in parallel, or may be multiple. The wick structure 2 of this embodiment also enables the return condensate in the second flow-directing wick 22 of the condensation zone b to flow in the same direction as the vapor in the cavity. In addition, the third diversion wicks 24 at the second ends of different reflux wicks 23 can be arranged at intervals to connect different positions of the second diversion wick 22, so that the liquid at different positions in the second diversion wick 22 can enter the corresponding reflux wicks 23 through the connected third diversion 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 path may include a region where the return wick 23 and the third guide wick 24 are not provided in the space between one side of the second guide wick 22 in the thickness direction and the upper cover plate 11 or the lower cover plate 12 of the housing 1. First portion of vapor flow path P1 may also include a second spaced-apart space between annular support structure 13 of housing 1 and second fluid-directing wick 22. Second portion P2 of the vapor flow path includes a first spaced area between first fluid directing wick 21 and housing 1 (e.g., one of upper and

lower cover plates

11, 12 and/or annular support structure 13) and a second spaced area at the side of return wick 23 (where second fluid directing wick 22 is not located) facing the vapor.

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

In addition, in fig. 8A, the first portion P1 of the vapor flow passage includes a first spacing space between return wick 23 and second flow-directing wick 22, i.e., innermost sub-wick 221, a second spacing space between housing 1 and second flow-directing wick 22, i.e., outermost sub-wick 221, and a third spacing space between adjacent sub-wicks 221. The second part P2 of the vapour flow path comprises a first spaced-apart region between the first guide wick 21 and the annular support structure 13 of the casing 1 and a second spaced-apart region at the vapour-facing side of the return wick 23 (where the second guide wick 22 is not provided).

Fig. 8B is a schematic cross-sectional view of the heat dissipation device shown in fig. 8A at line a-a, line B-B, and line C-C. In fig. 8B, as seen in the sectional view a-a, return wick 23 is constructed in a parallel configuration; as can be seen from the sectional view B-B, the second diversion wick 22 of the condensation area B adopts a parallel structure; as can be seen from the C-C sectional view, the third flow-guiding wick 24 of the condensation area b adopts a parallel structure.

In the heat dissipation device shown in fig. 3A, 4A, 5A, and 6A, the return wick 23 includes the first return wick 231, and the first return wick 231 is located in the middle of the housing 1 in the second direction, and in the heat dissipation device shown in fig. 8A, the return wick 23 includes the second return wick 232, and the second return wick 232 is located on one side of the housing 1 in the second direction. In other embodiments, the reflux wick 23 may include both the first reflux wick 231 and the second reflux wick 232, and the second reflux wick 232 may be in a serial configuration or in a parallel configuration.

Fig. 9A is a schematic top view illustrating a heat dissipation device provided in a fourth embodiment of the present application with an upper cover plate removed. As shown in fig. 9A, the condensation region b extends outward in a direction from close to the evaporation region a to far from the evaporation region a, the return wick 23 extends in the first direction and is located on one side of the evaporation region a in the second direction, a side surface of the return wick 23 far from the housing 1, that is, a side surface facing the vapor, is provided with a partition 3, one end of a third guide wick 24 is connected to a portion of the second end of the return wick 23 close to the evaporation region a, the other end of the third guide wick 24 extends in a direction from the evaporation region a and the return wick 23, the second guide wick 22 extends from the third guide wick 24 in a direction from far from the evaporation region a and is bent toward the return wick 23, and the second end D2 of the second guide wick 22 is close to the evaporation region a relative to the first end D1 of the second guide wick 22.

The first guide wick 21 includes a rod-shaped guide portion 213, one side of the rod-shaped guide portion 213 in the second direction is in contact with the side wall of the housing 1, and the other side of the rod-shaped guide portion 213 in the second direction is provided with a plurality of branch guide portions 214. The second fluid directing wick 22 is arcuate in shape. The second diversion wick 22 comprises a plurality of sub-wicks 221 arranged at intervals, and the sub-wicks 221 can be in a parallel structure or a serial structure. Alternatively, second fluid directing wick 22 is also a plate-like structure and is in a serial configuration.

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

Fig. 9B is a schematic cross-sectional view of the heat dissipation device shown in fig. 9A at a-a line and B-B line. In fig. 9B, as seen in the sectional view a-a, return wick 23 is constructed in a parallel configuration; as can be seen from the sectional view B-B, the second guide wick 22 and the third guide wick 24 in the condensation area B adopt a parallel structure.

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 diversion wick 22 in the condensation area b first contacts the vapor generated in the evaporation area a, and the vapor in the cavity and the return liquid in the second diversion wick 22 are in the same direction, which is favorable for the return flow of the condensate.

In addition, in the heat dissipating device of the example of the present application, the shape of the case 1 may be designed as needed. In one example, as shown in fig. 9A, the housing 1 includes a first region (provided with an evaporation region a), a second region and a third region (provided with a condensation region b) in sequence along the first direction, the width of the first region is smaller than that of the third region, the second region is an outward expansion structure, a small end of the outward expansion structure is connected with the first region, and a large end of the outward expansion 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 dissipation device provided in a fifth embodiment of the present application with an upper cover plate removed. As shown in fig. 10, the at least one return wick 23 includes a third return wick 233 and a fourth return wick 234 that are respectively located on both sides of the housing 1 in the second direction; the second diversion wick 22 is located between the third return wick 233 and the fourth return wick 234, and may extend in a first direction; a spacing space is arranged between the first end D1 of the second flow guide liquid suction core 22 and the first flow guide liquid suction core 21 along the first direction; the first end D1 of the second fluid-permeable wick 22 may be flush, and the second fluid-permeable wick 22 may include a plurality of wicks 221, with the first ends of the plurality of sub-wicks 221 being substantially uniform in height. Third fluid directing wick 24 may extend in a second direction.

Two ends of the first diversion wick 21 in the second direction are respectively connected with 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 flow guiding wick 21 includes a rod-shaped flow guiding portion 213 and a plurality of branch flow guiding portions 214 arranged side by side and at intervals, the rod-shaped flow guiding portion 213 is U-shaped, or the rod-shaped flow guiding portion 213 includes two L-shaped structures, a first side of the L-shaped structure is connected to the return flow wick 23, the plurality of branch flow guiding portions 214 are arranged on the first side or the second side of the L-shaped structure and face the inside of the L-shaped structure, in fig. 10, the plurality of branch flow guiding portions 214 are arranged on the second side of the L-shaped structure and are located on the side face of the rod-shaped flow guiding portion 213 facing the steam along the extending direction, and each branch flow guiding portion 214 extends in the direction away from the rod-shaped flow guiding portion 213.

In this embodiment, the casing 1 is a rectangular body, the width of the evaporation area a is the same as that of the condensation area b, the area of the evaporation area a is large, and a plurality of heat sources or large-area heating devices can be arranged corresponding to the evaporation area a for heat dissipation, that is, the casing can be applied to a scene of heat dissipation for a plurality of heat sources, that is, large-area heating devices of heating devices.

Additionally, in fig. 10, first portion P1 of the vapor flow path includes a first spacing space between return wick 23 or separator 3 and second flow directing wick 22, i.e., adjacent sub-wicks 221, and a third spacing space between adjacent sub-wicks 221. The second portion P2 of the vapor flow path includes a second spaced area at the side of the return wick 23 (the portion not adjacent to the second fluid directing wick 22) facing the vapor, i.e., the space between the first end D1 of the first and second

fluid directing wicks

21 and 22, and the third and

fourth return wicks

233 and 234.

Fig. 11 is a schematic top view illustrating a heat dissipation device according to a sixth embodiment of the present application with an upper cover plate removed. As shown in fig. 11, the inner space of the casing 1 includes a first evaporation zone a1 and a first condensation zone b1 arranged in a first direction and a second evaporation zone a2 and a second condensation zone b2 arranged in the first direction, the first evaporation zone a1 and the second condensation zone b2 being arranged side by side as in a second direction and being located at a first end of the casing 1 in the first direction; the first condensation zone b1 and the second evaporation zone a2 are disposed side by side as in the second direction and are located at the second end of the case 1 in the first direction; a spacing space is provided between the second fluid guiding wick 22 of the first condensation area b1 and the first fluid guiding wick 21 of the second evaporation area a2 and the first fluid guiding wick 21 of the first evaporation area a1 and the first fluid guiding wick 21 of the second condensation area b 2.

The reflux-wick 23 includes a fifth reflux-wick 235 and a sixth reflux-wick 236, the fifth reflux-wick 235 is located on a first side of the enclosure 1 along the second direction, the sixth reflux-wick 236 is located on a second side of the enclosure 1 along the second direction, the fifth reflux-wick 235 connects first ends of the first fluid-guiding wick 21 of the first evaporation area a1 and the third fluid-guiding wick 24 of the first condensation area b1 along the second direction, respectively, and the sixth reflux-wick 236 connects second ends of the first fluid-guiding wick 21 of the second evaporation area a2 and the third fluid-guiding wick 24 of the second condensation area b2 along the second direction, respectively. Furthermore, a separator 3 may be provided on the side of the return wick 23 facing the vapor so as to separate the vapor having the opposite flow direction from the return liquid in the return wick 23.

The first flow guiding wick 21 includes a rod-shaped flow guiding portion 213 and a plurality of branch flow guiding portions 214 arranged side by side and at intervals, the rod-shaped flow guiding portion 213 is L-shaped, a first side of the L-shape is connected to the return wick 23, and the plurality of branch flow guiding portions 214 are arranged on a second side of the L-shape and face the inner side of the L-shape. And, a plurality of branch guide parts 214 are provided at a side of the rod-shaped guide part 213 facing the steam in the second direction, each branch guide part 214 extending in a direction away from the rod-shaped guide part 213.

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

Second fluid directing wick 22 may extend in a first direction. Third fluid directing wick 24 may extend in a second direction. In order to form a spacing space between the second flow-guiding wick 22 of the first condensation area b1 and the first flow-guiding wick 21 of the second evaporation area a2 and the first flow-guiding wick 21 of the first evaporation area a1 and the first flow-guiding wick 21 of the second condensation area b2, in the first condensation area b1, the length of the second flow-guiding wick 22, e.g., a plurality of sub-wicks 221, decreases in the direction from the first evaporation area a1 to the second evaporation area a 2; within second condensation zone b2, second fluid directing wick 22, such as plurality of sub-wicks 221, increases in length along the direction from first evaporation zone a1 to second evaporation zone a 2. That is, in this implementation, the first end D1 of the second flow-guiding wick 22 of the first condensation area b1 forms an inclined structure, and the first end D1 of the second flow-guiding wick 22 of the second condensation area b2 forms an inclined structure, and the two inclined structures may be arranged in parallel and at an interval, so as to form an interval space.

Additionally, in fig. 11, first portion P1 of the vapor flow path includes a first spacing-up space between return wick 23 or separator 3 and second fluid-directing wick 22, i.e., adjacent sub-wicks 221, and a third spacing-up space between adjacent sub-wicks 221. The second portion P2 of the vapor flow path includes a second spaced area at the side of the return wick 23 (the portion not adjacent to the second guide wick 22) facing the vapor, specifically, the second spaced area may be the space between the first guide wick 21 and the second guide wick 22, i.e., the first ends D1 of the plurality of sub-wicks 221.

In this embodiment, two evaporation zones, i.e., the first evaporation zone a1 and the second evaporation zone a2, are provided, and a heat generating device may be provided corresponding to each evaporation zone, and thus, it is applicable to a scenario of a plurality of heat generating sources. The heat dissipation device meets the characteristic that vapor generated in the evaporation region firstly contacts the top part of the second diversion wick 22 in the condensation region, namely the first end D1, and can also realize the cocurrent flow of gas and liquid in the condensation region. It should be noted that this embodiment is only an example of an application scenario of two heat generating sources, and may also be changed accordingly according to specific work requirements, for example, more evaporation areas are provided, or more condensation areas are provided, or the positions, shapes, and the like of the evaporation areas and the condensation areas are adjusted.

In addition, the manufacturing process of the heat dissipation device such as the vapor chamber includes a step of exhausting air to realize internal vacuum, and an exhaust opening needs to be designed at the edge of the vapor chamber. Since the condensing zone has a high requirement on the flatness of the vapor chamber, the suction opening is typically disposed in the evaporation zone.

Fig. 12 is a schematic top view of a heat dissipation device with an upper cover plate removed. As shown in fig. 12, the heat sink includes an evaporation zone and a condensation zone, and a wick, such as a capillary structure, is located in a cavity inside a support structure of the housing. In the scheme shown in fig. 12, because the opening of the internal cavity formed by the wicks faces away from the pumping hole, the cavity between the wicks in the condensation area is easy to have gas residue in the process of vacuumizing, and an uneven structure can be formed, namely, the problem that the gas in the internal cavity cannot be pumped out completely exists.

In the embodiments introduced above, the cavity flow path is simple, the opening of the internal cavity formed by the wick structure 2 faces the pumping port, the gas in the internal cavity can be rapidly pumped out through the pumping port H in the evaporation area a, and the cavity at the second diversion wick 22 in the condensation area b is not prone to gas residue in the vacuum pumping process, so that an uneven structure is avoided. The suction opening H is shown in fig. 4A and 10 by way of example.

Specifically, in order to facilitate the 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 housing 1, and the housing 1 is provided with an air extraction opening H, the air extraction opening H corresponds to one of the evaporation area a and the condensation area b, and the air extraction opening H is directly communicated with one of the evaporation area a and the condensation area b. In fig. 4, the pumping hole 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 pumped through the pumping hole H.

Scheme 2 — as shown in fig. 10, the wick structure 2 forms a closed structure in the housing 1, the housing 1 is provided with an air extraction opening H, the air extraction opening H corresponds to one of the evaporation area a and the condensation area b, the wick structure 2 at one of the evaporation area a and the condensation area b is provided with a through opening K, and the air extraction opening H is communicated with one of the evaporation area a and the condensation area b through the through opening K. In fig. 10, the suction opening H corresponds to the evaporation area a. The liquid absorption core structure 2 at the evaporation area a is provided with a through opening K, the air pumping hole 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 the evaporation area a and the condensation area b can be pumped through the air pumping hole 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 architecture, at this time, a through opening K may be provided on the closed structure so as to communicate with the air pumping opening H on the housing 1, thereby realizing air pumping of the evaporation area a and the condensation area b through the air pumping opening H and the through opening K. It will be appreciated that if the closed structure is of a serial configuration, the through opening K can be eliminated and the suction opening H in the housing 1 can be in direct communication with one of the evaporation zone a and the condensation zone b.

In the heat dissipation device of the embodiment of the present application, the first diversion wick 21, the second diversion wick 22, the return wick 23, and the partition 3 mainly include the following:

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

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

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

scheme 3 — the first guide wick 21 includes a plate-shaped body 211, and the plate-shaped body 211 is in a serial structure, as shown in fig. 6A;

scheme 4 — on the basis of scheme 1, the first guide liquid wick 21 further includes a plurality of branch portions 212, and both sides of each branch portion 212 in the thickness direction are respectively connected to the plate-shaped main body 211 and the side wall of the housing 1, and the branch portions 212 may be in a serial configuration or a parallel configuration, as shown in fig. 7.

2. The top of second fluid-conducting wick 22 in condensation area b (i.e., suspended first end D1) first contacts the gas exiting from evaporation area a in the cavity than the side of second fluid-conducting wick 22 in condensation area b. The direction of flow of the condensate in each second fluid-conducting wick 22 is the same as the direction of flow of the gas in the cavity. The second diversion wick 22 extending from the condensation area is not connected with the first diversion wick 21 extending from the evaporation area a, namely, the first end D1 of the second diversion wick 22 is arranged in a suspended manner. The second diversion wick 22 can have, but is not limited to, the following two schemes:

scheme 1 — the second diversion wick 22 includes a plurality of sub-wicks 221 arranged at intervals, and the sub-wicks 221 may be in a serial architecture or a parallel architecture, and may be in a curved shape, as shown in fig. 3A; may be linear, as shown in fig. 4A, 8A, 10 and 11; may be arcuate as shown in fig. 9A.

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

In addition, the second fluid directing wick 22 may have other shapes, or a combination of serial and parallel configurations.

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

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

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

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

scheme 4 — the return liquid suction core 23 extends along the first direction and is located at one side of the evaporation area a, one end of the third flow-guiding liquid suction core 24 is connected to a portion, close to the evaporation area a, of the second end of the return liquid suction core 23, and the other end of the third flow-guiding liquid suction core 24 extends along a direction away from the evaporation area a and the return liquid suction core 23, as shown in fig. 9A;

scheme 5 — the return fluid wick 23 includes a third return fluid wick 233 and a fourth return fluid wick 234 respectively located on both sides of the housing 1, and the third return fluid wick 233 and the fourth return fluid wick 234 are located in the same condensation area b, as shown in fig. 10;

scheme 6 — return wick 23 includes fifth return wick 235 and sixth return wick 236, respectively, on either side of housing 1, with fifth return wick 235 and sixth return wick 236 being located in different condensation zones, as shown in fig. 11.

In addition, the return wick 23 may be in other schemes, for example, a combination of scheme 1 and scheme 2, that is, the return wick 23 includes a first return wick 231 located in the middle of the housing 1 and a second return wick 232 located on one side of the housing 1.

Further, both sides of return wick 23 in the thickness direction may be in contact with the side walls of housing 1, respectively, i.e., return wick 23 is a parallel structure. Alternatively, one side of the reflux liquid absorption core 23 in the thickness direction is in contact with the side wall of the housing 1, and the other side of the reflux liquid absorption core 23 in the thickness direction is spaced from the side wall of the housing 1, that is, the reflux liquid absorption core 23 is in a serial architecture, and the side of the reflux liquid absorption core 23 in the thickness direction in contact with the side wall of the housing 1 may be a side close to the heat generating device or a side far from the heat generating device. In one example, if the heat generating device is in contact with the lower cover 12 of the housing 1, the reflux wick 23 of the serial architecture may be disposed on the inner surface of the lower cover 12, i.e., in contact with the inner surface of the lower cover 12, and spaced apart from the inner surface of the upper cover 11 to form a space for the flow of vapor.

Preferably, reflux wick 23 is a parallel architecture. The other diversion liquid absorption cores can be in a parallel structure or a serial structure. Further, a single material may be used, a plurality of materials may be used, only one structure may be included, or a plurality of structures may be included.

4. A spacer 3 is provided on the side of each reflux-wick 23 facing the vapour in the direction of extension, wherein:

when the return wick 23 is located at the middle of the housing 1, the separators 3 are provided on both sides of the return wick 23 in the extending direction, as shown in fig. 3A, 4A, 5A, 6A, and 7;

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

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

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

In summary, the vapor flowing in the cold end of the heat dissipation device with the serial architecture and the parallel architecture, i.e. the condensing area, in the reverse direction carries the liquid to make the liquid stay in the condensing area, which is not favorable for the condensed liquid to return to the evaporating area. The scheme of this application embodiment makes the first end of the second water conservancy diversion wick in condensation zone the gas that the evaporation zone flowed out can be contacted preferentially at the top promptly, thereby realize near gas and the liquid syntropy flow of condensation zone second water conservancy diversion wick, eliminated the carrying effect of gas-liquid reverse flow to liquid, be favorable to the condensate liquid to return liquid to the evaporation zone, the phenomenon of drying out is difficult to appear, the samming performance has been promoted, under the less condition like attenuate thickness of heat abstractor volume, still can satisfy the operation requirement.

Wherein, thereby the backward flow imbibition core that hot junction (evaporating zone) extended to cold junction (condensing zone) can adopt parallel framework and serial framework, furthermore, because the flow direction of liquid is opposite with the flow direction of steam in the backward flow imbibition core, so can set up the separator along the side of extending direction orientation steam at the backward flow imbibition core, play the effect of keeping apart steam and the liquid in the backward flow imbibition core, avoid the vapor of reverse flow to carry the liquid droplet and make the condensate droplet stay in the condensing zone, the separator can also play the supporting role simultaneously, structural strength is improved.

In addition, among the heat abstractor of this application embodiment, runner route is simple in the cavity, and the opening of the inside cavity that wick structure formed is towards the extraction opening, can extract totally fast the gas in the cavity through the extraction opening of evaporating zone, and the cavity of the second water conservancy diversion wick department in condensing zone is difficult to appear gaseous residue in the evacuation process, has avoided forming unevenness's structure.

Finally, the following is explained: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat dissipating device, comprising:

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

the liquid absorption core structure (2) is arranged in the shell (1) and forms a steam flow channel in the shell (1), the liquid absorption core structure (2) comprises a first flow-guide liquid absorption core (21), a second flow-guide liquid absorption core (22) and at least one backflow liquid absorption core (23), the first flow-guide liquid absorption core (21) is located in the evaporation area (a), a first end (D1) of the second flow-guide liquid absorption core (22) is arranged in a suspended mode, a second end (D2) of the second flow-guide liquid absorption core (22) is located in the condensation area (b), a first end of the backflow liquid absorption core (23) is connected with the first flow-guide liquid absorption core (21), and a second end of the backflow liquid absorption core (23) is connected with a second end (D2) of the second flow-guide liquid absorption core (22);

wherein the vapor flow channel comprises a first portion (P1) adjacent to the second flow directing wick (22), the direction in which the first end (D1) of the second flow directing wick (22) extends to the second end (D2) of the second flow directing wick (22) coincides with the direction in which the first portion (P1) of the vapor flow channel extends, and the first end (D1) of the second flow directing wick (22) is adjacent to the evaporation area (a) relative to the second end (D2) of the second flow directing wick (22) along the direction in which the vapor flow channel extends.

2. The heat dissipating device of claim 1, wherein:

the first end (D1) of the second diversion wick (22) extends to the evaporation area (a), one end of the first part (P1) of the vapor flow channel is communicated with the evaporation area (a), and the other end of the first part (P1) of the vapor flow channel extends to the second end of the return wick (23); or the like, or, alternatively,

the first end (D1) of second water conservancy diversion wick (22) is located condensation zone (b), the steam flow passageway still includes second part (P2), the one end intercommunication of the second part (P2) of steam flow passageway evaporation zone (a), the other end intercommunication of the second part (P2) of steam flow passageway the one end of the first part (P1) of steam flow passageway and the first end (D1) of second water conservancy diversion wick (22), the other end of the first part (P1) of steam flow passageway extends to the second end of backward flow wick (23).

3. The heat dissipating device according to claim 1 or 2, wherein:

the first portion of vapor flow passage (P1) comprises at least one of a first spaced-apart space between the reflux wick (23) and the second fluid-conducting wick (22) and a second spaced-apart space between the housing (1) and the second fluid-conducting wick (22); and/or the presence of a gas in the gas,

the second portion (P2) of the vapour flow path comprises at least one of a first spaced area between the first guide wick (21) and the housing (1) and a second spaced area at the vapour facing side of the return wick (23).

4. The heat dissipation device according to any one of claims 1-3, wherein the second fluid-directing wick (22) comprises a plurality of sub-wicks (221) arranged at intervals, wherein second ends of the plurality of sub-wicks (221) are connected to the return-flow wick (23), wherein first ends of the plurality of sub-wicks (221) are arranged in a floating manner, and wherein the first portion (P1) of the vapor flow channel comprises a third interval space between adjacent sub-wicks (221).

5. The heat dissipating device of claim 4, wherein:

two sides of each sub-wick (221) in the thickness direction are respectively contacted with the side wall of the shell (1); or the like, or a combination thereof,

each sub-wick (221) is in contact with a sidewall of the housing (1) along one side in the thickness direction, and each sub-wick (221) is spaced from the sidewall of the housing (1) along the other side in the thickness direction to form a second spaced space of the vapor flow channel.

6. The heat sink according to any one of claims 1 to 3, wherein the second fluid guiding wick (22) has a plate-like structure, one side of the second fluid guiding wick (22) in the thickness direction is in contact with a sidewall of the housing (1), and the other side of the second fluid guiding wick (22) in the thickness direction is spaced apart from the sidewall of the housing (1) to form a second spaced-apart space of the vapor flow channel.

7. The heat dissipating device according to any of claims 1-6, wherein the wick structure (2) further comprises:

third water conservancy diversion wick (24), be located condensation zone (b), and with the second end (D2) of second water conservancy diversion wick (22) with backward flow wick (23) are connected, third water conservancy diversion wick (24) are used for with liquid in second water conservancy diversion wick (22) leads to in backward flow wick (23).

8. The heat sink according to claim 7, wherein, in a set of the evaporation region (a) and the condensation region (b) aligned along the first direction, the third guide wick (24) extends along a second direction perpendicular to the thickness direction of the housing (1) and arranged at an angle to the first direction, the second guide wick (22) extends from the third guide wick (24) toward the evaporation region (a), and the first end (D1) of the second guide wick (22) is close to the evaporation region (a) with respect to the second end (D2) of the second guide wick (22).

9. The heat dissipating device of claim 8, wherein:

the at least one backflow liquid absorbing core (23) comprises one or more than two first backflow liquid absorbing cores (231), the first backflow liquid absorbing cores (231) are located in the middle of the shell (1) along the second direction, and the two sides of each first backflow liquid absorbing core (231) are respectively provided with a second flow guiding liquid absorbing core (22); the second end of the first reflux liquid absorbing core (231) is connected with the middle part of the third diversion liquid absorbing core (24); and/or the presence of a gas in the gas,

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

10. The heat dissipation device according to claim 8, characterized in that the at least one return wick (23) comprises a third return wick (233) and a fourth return wick (234) respectively located on either side of the housing (1) in the second direction; the second fluid-directing wick (22) is positioned 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;

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

11. The heat dissipating device according to claim 8, wherein the inner space of the case (1) comprises a first evaporation zone (a1) and a first condensation zone (b1) arranged in a first direction and a second evaporation zone (a2) and a second condensation zone (b2) arranged in the first direction, the first evaporation zone (a1) and the second condensation zone (b2) being arranged side by side and located at a first end of the case (1) in the first direction; the first condensation zone (b1) and the second evaporation zone (a2) are arranged side by side and at a second end of the housing (1) in a first direction; a spacing space is arranged between the second flow-guiding liquid suction core (22) of the first condensation area (b1) and the first flow-guiding liquid suction core (21) of the second evaporation area (a2) and the first flow-guiding liquid suction core (21) of the first evaporation area (a1) and the first flow-guiding liquid suction core (21) of the second condensation area (b 2);

at least one backflow wick (23) includes fifth backflow wick (235) and sixth backflow wick (236), fifth backflow wick (235) is located the edge of casing (1) the first side of second direction, sixth backflow wick (236) is located the edge of casing (1) the second side of second direction, fifth backflow wick (235) is connected first water conservancy diversion wick (21) of first evaporation area (a1) and third water conservancy diversion wick (24) of first condensation area (b1), sixth backflow wick (236) is connected first water conservancy diversion wick (21) of second evaporation area (a2) and third water conservancy diversion wick (24) of second condensation area (b 2).

12. The heat dissipating device of claim 11, wherein:

within the first condensation zone (b1), the second flow-directing wick (22) decreases in length in a direction from the first evaporation zone (a1) to the second evaporation zone (a 2);

within the second condensation zone (b2), the second flow-directing wick (22) increases in length in a direction from the first evaporation zone (a1) to the second evaporation zone (a 2).

13. The heat dissipation device according to claim 7, wherein the at least one return wick (23) includes more than two return wicks (23) located at a middle portion of the housing (1) along a second direction, the second direction is perpendicular to a thickness direction of the housing (1) and is disposed at an angle to the first direction, the third guide wick (24) is disposed at a second end of each return wick (23), third guide wicks (24) at second ends of different return wicks (23) are spaced apart, a width of each third guide wick (24) is greater than a width of the return wick (23), and each third guide wick (24) is connected to at least a portion of the second guide wick (22).

14. The heat dissipation device according to claim 7, wherein the condensation region (b) extends outward in a direction from the evaporation region (a) to a position away from the evaporation region (a), the return wick (23) extends in the first direction and is located on one side of the evaporation region (a) in a second direction, which is perpendicular to the thickness direction of the housing (1) and is disposed at an angle to the first direction, one end of the third guide wick (24) is connected to a portion of the second end of the return wick (23) close to the evaporation region (a), the other end of the third guide wick (24) extends in a direction away from the evaporation region (a) and the return wick (23), the second guide wick (22) extends from the third guide wick (24) in a direction away from the evaporation region (a) and is bent toward the return wick (23), the second end (D2) of the second fluid directing wick (22) is proximate the evaporation zone (a) relative to the first end (D1) of the second fluid directing wick (22).

15. The heat dissipating device according to any one of claims 1 to 14, wherein the first flow-guiding wick (21) includes a plate-shaped main 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 spaced apart from the side wall of the housing (1).

16. The heat dissipating device according to claim 15, wherein 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 main body (211) and the side wall of the housing (1) at both sides in the thickness direction, and the return wick (23) is connected to at least one of the plate-shaped main body (211) and the branch portions (212).

17. The heat sink according to any one of claims 1 to 14, wherein the first flow-guiding wick (21) comprises a rod-shaped flow-guiding portion (213), and wherein an end of the rod-shaped flow-guiding portion (213) near the condensation region (b) in the first direction is connected to a first end of the return-flow wick (23).

18. The heat dissipating device of claim 17, 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 the like, or, alternatively,

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

19. The heat sink according to claim 17 or 18, wherein the first fluid-guiding wick (21) further comprises a plurality of branched fluid-guides (214) arranged side-by-side and spaced apart, each branched fluid-guide (214) extending in a direction away from the rod-shaped fluid-guide (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 the like, or, alternatively,

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

20. The heat dissipating device of claim 19,

two sides of each branch flow guide part (214) along the thickness direction are respectively contacted with the side wall of the shell (1); or the like, or, alternatively,

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

21. The heat sink according to any one of claims 1-20, wherein an air suction port (H) is provided on the housing (1), the air suction port (H) corresponding to one of the evaporation zone (a) and the condensation zone (b), wherein:

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

a through opening (K) is arranged on the wick structure (2) at one of the evaporation area (a) and the condensation area (b), and the pumping opening (H) is communicated with one of the evaporation area (a) and the condensation area (b) through the through opening (K).

22. The heat dissipating device of any of claims 1-21, wherein:

two sides of the backflow liquid absorbing core (23) along the thickness direction are respectively contacted with the side wall of the shell (1); or the like, or, alternatively,

the edge of backward flow wick (23) one side of thickness direction with the lateral wall contact of casing (1), the edge of backward flow wick (23) the opposite side of thickness direction with the lateral wall interval of casing (1) sets up.

23. The heat sink according to any one of claims 1 to 22, further comprising a spacer (3), wherein the spacer (3) is provided on a side of each return wick (23) facing the vapor, and wherein both sides of the spacer (3) in the thickness direction are in contact with the side walls of the housing (1); wherein:

the backflow liquid absorbing 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 absorbing core (23); or the like, or, alternatively,

backflow liquid suction cores (23) are located on one side of the shell (1), and the side face, far away from one side of the shell (1), of the backflow liquid suction cores (23) is provided with the isolating piece (3).

24. The heat dissipating device of claim 23, wherein:

the isolating piece (3) and the side wall of one side of the shell (1) along the thickness direction are integrally formed or separately formed; and/or the presence of a gas in the gas,

the isolating piece (3) is of an integral structure or the isolating piece (3) comprises a plurality of segments which are arranged at intervals along the extending direction of the backflow liquid absorbing core (23).

25. The heat dissipating device according to any of claims 1 to 24, wherein the wick structure (2) is a capillary structure; the capillary structure is formed in a manner including at least one of: weaving, sintering, etching and electroplating.

26. An electronic device, comprising:

the heat dissipation device of any of claims 1-25;

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