CN215345634U

CN215345634U - Heat dissipation device for folding screen and mobile terminal

Info

Publication number: CN215345634U
Application number: CN202121467546.XU
Authority: CN
Inventors: 陶建云
Original assignee: Wuxi Wentai Information Technology Co ltd
Current assignee: Wuxi Wentai Information Technology Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-12-28
Anticipated expiration: 2031-06-29

Abstract

The present disclosure relates to a heat dissipation device for a foldable screen and a mobile terminal, wherein the heat dissipation device comprises a first heat pipe, a second heat pipe, at least one fixed shaft and at least one rotating assembly; the first heat pipe is internally provided with a first heat transfer channel, the fixed shaft is internally provided with a second heat transfer channel, the rotating assembly is internally provided with a third heat transfer channel, and the second heat pipe is internally provided with a fourth heat transfer channel; and rotatable coupling is realized through the cooperation of rotating assembly and fixed axle between first heat pipe and the second heat pipe, thereby can be applicable to the folding function of folding screen, first heat pipe and second heat pipe can be followed the different fold condition realization relative rotation of folding screen promptly, make the folding screen no matter fold to be in the coplanar or be in and stride planar state, all can realize striding the plane heat transfer between first heat pipe and the second heat pipe through first heat transfer passageway, the second heat transfer passageway, third heat transfer passageway and fourth heat transfer passageway communicate formation heat transfer route in proper order, so that heat abstractor's heat transfer effect is better.

Description

Heat dissipation device for folding screen and mobile terminal

Technical Field

The present disclosure relates to the field of heat dissipation technologies, and in particular, to a heat dissipation device for a foldable screen and a mobile terminal.

Background

Mobile terminal, for example cell-phone etc. is a highly integrated smart machine, and along with the user constantly promotes to mobile terminal's performance demand, mobile terminal's heat dissipation problem also constantly stands out. In recent years, mobile terminals with folding screens have come up, but the traditional heat dissipation technology is difficult to deal with the cross-region heat transfer of the folding screens.

Currently, trans-regional heat transfer of mobile terminals with folded screens is mainly achieved by flexible heat dissipating materials, such as flexible graphite. However, as the foldable screen is continuously bent, the heat transfer effect of the flexible heat dissipation material disposed at the foldable screen is gradually reduced, so that the heat uniformity of the mobile terminal is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a heat dissipation device for a foldable screen and a mobile terminal.

In one aspect, the present disclosure provides a heat dissipation device for a foldable screen, where the foldable screen has at least two foldable main bodies, and two adjacent foldable main bodies are rotatably connected, and the heat dissipation device includes a first heat pipe, a second heat pipe, a fixed shaft, and a rotating assembly;

the first heat pipe is arranged on one of the two adjacent folding main bodies, the second heat pipe is arranged on the other of the two adjacent folding main bodies, the rotating assembly and the fixing shaft are coaxially arranged between the two adjacent folding main bodies and are rotationally connected, the first heat pipe is connected with one side of the fixing shaft and is relatively fixed, and the second heat pipe is connected with one side of the rotating assembly, which is far away from the first heat pipe, and is relatively fixed;

the first heat pipe is internally provided with a first heat transfer channel, the fixed shaft is internally provided with a second heat transfer channel, the rotating assembly is internally provided with a third heat transfer channel, the second heat pipe is internally provided with a fourth heat transfer channel, and the first heat transfer channel, the second heat transfer channel, the third heat transfer channel and the fourth heat transfer channel are sequentially communicated to form a heat transfer path so as to transfer heat between the first heat pipe and the second heat pipe in a cross-plane manner.

According to an embodiment of the present disclosure, the first heat transfer channel extends along a length extension direction of the first heat pipe, the fourth heat transfer channel extends along a length extension direction of the second heat pipe, and the second heat transfer channel and the third heat transfer channel both extend along an axial direction of the rotating assembly; the first heat transfer channel is parallel to the fourth heat transfer channel, and the second heat transfer channel is perpendicular to the first heat transfer channel.

According to an embodiment of the present disclosure, the folding screen has at least three folding main bodies which are sequentially and rotatably connected, and among the three adjacent folding main bodies, the second heat pipes corresponding to two adjacent folding main bodies are communicated with the first heat pipes corresponding to the other two adjacent folding main bodies.

According to an embodiment of the present disclosure, a backflow structure is disposed in the heat transfer path, and is configured to allow a heat transfer working medium in the heat transfer path to flow back between the first heat pipe and the second heat pipe.

According to an embodiment of the present disclosure, the fixing shaft includes a fixing shaft body and a connecting shaft extending out of two ends of the fixing shaft body, the second heat transfer channel is formed in the fixing shaft body, the rotating assembly is sleeved on the connecting shaft, and a connecting hole is formed in the connecting shaft and used for connecting an external mobile terminal.

According to an embodiment of the present disclosure, a magnetic flow sealing member is disposed between the rotating assembly and the fixed shaft, the magnetic flow sealing member includes a magnetizer and a permanent magnet, a magnetic groove is disposed on one side of the magnetizer, which is close to the fixed shaft, a magnetic fluid is filled in the magnetic groove, and the magnetic fluid is adsorbed in the magnetic groove under the magnetic field effect of the permanent magnet to form a sealing ring, so as to seal the fixed shaft and the rotating assembly.

According to an embodiment of the present disclosure, the rotating assembly includes a rotating cylinder and a rotating member disposed in the rotating cylinder, the rotating member is sleeved on the fixed shaft so that the rotating cylinder is rotatably connected with the fixed shaft, and the second heat pipe is connected with the fixed shaft through the outer wall of the rotating cylinder and the second heat pipe.

On the other hand, the embodiment of the present disclosure provides a mobile terminal, which includes a foldable screen and the above heat dissipation device for a foldable screen, where the foldable screen includes at least two foldable main bodies, and one heat dissipation device is disposed between two adjacent foldable main bodies.

According to an embodiment of the present disclosure, two adjacent folding main bodies are connected to each other through a main shaft (rotatably connected, the fixed shaft is connected to the main shaft), or two adjacent folding main bodies are rotatably connected through the corresponding heat dissipation device.

According to an embodiment of the present disclosure, the first heat pipe and the second heat pipe are soldered on the respective folding main;

and one of the two adjacent folding main bodies is provided with a heating element, and the first heat pipe is arranged at the position corresponding to the heating element.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the utility model provides a heat abstractor and mobile terminal for folding screen, folding screen has two at least folding main parts, and two adjacent folding main parts rotate to be connected, and heat abstractor includes first heat pipe, second heat pipe, fixed axle and rotating assembly; the first heat pipe is internally provided with a first heat transfer channel, the fixed shaft is internally provided with a second heat transfer channel, the rotating assembly is internally provided with a third heat transfer channel, and the second heat pipe is internally provided with a fourth heat transfer channel; and rotatable coupling is realized through the cooperation of rotating assembly and fixed axle between first heat pipe and the second heat pipe, thereby can be applicable to the folding function of folding screen, first heat pipe and second heat pipe can be followed the different fold condition realization relative rotation of folding screen promptly, make no matter folding screen fold to be in the coplanar or be in the state of striding the plane, all can realize striding the plane heat transfer between first heat pipe and the second heat pipe and realize the samming through first heat transfer passageway, second heat transfer passageway, third heat transfer passageway and fourth heat transfer passageway intercommunication formation heat transfer route in proper order, so that heat abstractor's heat transfer effect is better.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic perspective view illustrating a first heat dissipation device for a foldable screen according to an embodiment of the disclosure;

fig. 2 is a schematic internal structural diagram of a first heat dissipation device for a foldable screen according to an embodiment of the present disclosure;

FIG. 3 is an enlarged partial schematic view of FIG. 2 at A;

fig. 4 is a schematic perspective view illustrating a second heat dissipation device for a foldable screen according to an embodiment of the disclosure;

FIG. 5 is a schematic view of the internal structure of the heat sink shown in FIG. 4 at the location of the rotating assembly;

fig. 6 is a schematic structural diagram of a first mobile terminal according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a second mobile terminal according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a third mobile terminal according to the embodiment of the present disclosure.

Wherein, 1, a first heat pipe; 11. a first heat transfer channel; 2. a second heat pipe; 21. a fourth heat transfer passage; 3. a fixed shaft; 31. a second heat transfer passage; 32. a fixed shaft body; 33. a connecting shaft; 34. connecting holes; 4. a rotating assembly; 41. a third heat transfer passage; 42. a rotary drum; 43. a rotating member; 6. a reflow structure; 5. a magnetic flow seal; 51. a magnetizer; 52. a permanent magnet; 53. a magnetic slot; 54. a magnetic fluid; 55. a magnetic induction line; 100. folding the screen; 101. folding the main body; 102. a main shaft; 103. a heating element; 104. and fixing the hinge.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1 to 4, the present disclosure provides a heat dissipation device for a folding screen, the folding screen having at least two folding main bodies, adjacent two folding main bodies being rotatably connected, wherein the heat dissipation device includes a first heat pipe 1, a second heat pipe 2, a fixed shaft 3, and a rotating assembly 4; the first heat pipe 1 is used for being arranged on one of two adjacent folding main bodies, the second heat pipe is used for being arranged on the other of the two adjacent folding main bodies, the rotating component 4 and the fixing shaft 3 are coaxially arranged between the two adjacent folding main bodies and are in rotating connection, the first heat pipe 1 is connected with one side of the fixing shaft 3 and is relatively fixed, and the second heat pipe 2 and one side of the rotating component 4, far away from the first heat pipe 1, are connected and are relatively fixed. The first heat pipe 1 is internally provided with a first heat transfer channel 11, the fixed shaft 3 is internally provided with a second heat transfer channel 31, the rotating component 4 is internally provided with a third heat transfer channel 41, and the second heat pipe 2 is internally provided with a fourth heat transfer channel 21; and rotatable coupling is realized through the cooperation of rotating assembly 4 and fixed axle 3 between first heat pipe 1 and the second heat pipe 2, thereby can be applicable to the folding function of folding screen, first heat pipe 1 and second heat pipe 2 can realize relative rotation along with the different fold condition of folding screen, make the folding screen no matter fold to be in the coplanar or be in the state of striding the plane, all can realize crossing the plane heat transfer between first heat pipe 1 and the second heat pipe 2 and realize the samming through first heat transfer passageway 11, second heat transfer passageway 31, third heat transfer passageway 41 and fourth heat transfer passageway 21 intercommunication formation heat transfer route in proper order, the heat transfer route can specifically refer to the arrow in fig. 1 and fig. 4 and show, so that heat abstractor's heat transfer effect is better, avoid the local high temperature of folding screen.

As shown in fig. 1 and 4, the first heat transfer passage 11 extends along the length extension direction of the first heat pipe 1, i.e., along the x direction shown in fig. 1, the fourth heat transfer passage 21 extends along the length extension direction of the second heat pipe 2, i.e., along the x direction shown in fig. 1, and the second heat transfer passage 31 and the third heat transfer passage 41 both extend along the axial direction of the rotating assembly 4, i.e., along the y direction shown in fig. 1; the first heat transfer channel 11 is parallel to the fourth heat transfer channel 21, the second heat transfer channel 31 is perpendicular to the first heat transfer channel 11, and the third heat transfer channel 41 is also perpendicular to the first heat transfer channel 11. Or in other embodiments, the second heat transfer channel 31 may be disposed at an acute or obtuse angle to the first heat transfer channel 11.

Specifically, as shown in fig. 1, when the foldable screen has two foldable main bodies, the heat dissipation device of the first embodiment includes a fixing shaft 3, a rotating component 4, a first heat pipe 1 and a second heat pipe 2, the rotating component 4 and the fixing shaft 3 are rotatably connected, for example, can be sleeved, the rotating component 4 is sleeved on the fixing shaft 3 and can rotate with the fixing shaft 3 as an axis, one side of the rotating component 4 is connected with the second heat pipe 2, one side of the fixing shaft 3 away from the rotating component 4 is connected with the first heat pipe 1, for example, referring to the drawing direction shown in fig. 1, the left side of the fixing shaft 3 is connected with the first heat pipe 1, the right side of the rotating component 4 is connected with the second heat pipe 2, the fixing shaft 3 and the first heat pipe 1 can be welded or integrally formed, the rotating component 4 and the second heat pipe 2 can be welded or integrally formed, the fixing shaft 3 and the first heat pipe 1 are fixedly connected relatively, the second heat pipe 2 and the rotating component 4 are fixedly connected relatively, the fixing shaft 3 and the rotating component 4 are rotatably connected, and therefore the first heat pipe 1 and the second heat pipe 2 can rotate relatively, and can be coplanar or not coplanar to adapt to the folding function of the folding screen. And the first heat pipe 1, the fixed shaft 3, the rotating component 4 and the second heat pipe 2 are communicated in sequence to form a heat transfer path, and the heat transfer path specifically refers to the arrow direction shown in fig. 1, so that cross-plane heat transfer can be realized between the first heat pipe 1 and the second heat pipe 2.

In this embodiment, the rotating assembly 4 may be a water hinge or other rotating connection structure, such as a rotating structure composed of a rotating drum.

For a scenario where the mobile terminal has a plurality of folding screens or the first and

second heat pipes

1 and 2 need to maintain the same horizontal position, a plurality of rotating assemblies 4 and fixed shafts 3 need to be provided to accommodate folding between the plurality of folding screens. For example, the present embodiment is described by taking three folding screens as an example, and other numbers of folding screens may be referred to the example similarly.

Specifically, as shown in fig. 4, the present embodiment provides a second heat dissipation device, when the folding screen includes three folding main bodies, the second heat pipes 2 corresponding to two adjacent folding main bodies are communicated with the first heat pipes 1 corresponding to the other two adjacent folding main bodies in the three adjacent folding main bodies. Referring to fig. 4, a first heat pipe 1 is disposed on the leftmost folding main body, a second heat pipe 2 communicated with the first heat pipe 1 is disposed on the middle folding main body, and the second heat pipe 2 serves as the first heat pipe 1 communicated with the second heat pipe 2 disposed on the rightmost folding main body.

In addition, in this embodiment, the first heat pipe 1 and the second heat pipe 2 may be both straight pipes or both bent pipes, or the first heat pipe 1 may be a straight pipe and the second heat pipe 2 may be a bent pipe, or the first heat pipe 1 may be a bent pipe and the second heat pipe 2 may be a straight pipe, so as to adapt to the distribution of the heat source, and the specific shapes and sizes of the first heat pipe 1 and the second heat pipe 2 are set according to actual needs.

As shown in fig. 2, 3, and 5, a backflow structure 6 is disposed in the heat transfer path for causing the heat transfer working medium in the heat transfer path to flow back between the first heat pipe 1 and the second heat pipe 2, when the heat source gas is transmitted in the heat transfer path indicated by the arrow shown in fig. 1 or 4, the heat source gas may condense to form a liquid working medium, and the liquid working medium may flow back and be transmitted through the backflow structure 6. In addition, the liquid working medium in the first heat pipe 1 and the second heat pipe 2 may be ultrapure water, methanol, propanol, or the like, or may not be limited to the liquid working medium example of the present embodiment.

Further, the reflow structure 6 may be specifically a sintered capillary wick, and the sintered capillary wick may enhance the suction capability of the capillary wick to weaken the influence on the heat transfer performance when the first heat pipe 1 and the second heat pipe 2 are folded relatively.

The principle of heat transfer for the first heat pipe 1 and the second heat pipe 2 is explained as follows: a typical heat pipe consists of a pipe shell, a wick, and end caps. The interior of the heat pipe is pumped into a negative pressure state and filled with proper heat transfer working medium, and the heat transfer working medium has low boiling point and is easy to volatilize. The heat pipe is internally provided with a sintered capillary core which is made of capillary porous materials. When one end of the heat pipe is heated, the heat transfer working medium in the capillary core is rapidly evaporated, the steam flows to the other end under a small pressure difference and releases heat to be condensed into liquid heat transfer working medium again, the liquid flows back to the evaporation section along the porous material under the action of capillary force, and the heat is transferred from one end of the heat pipe to the other end after the circulation is stopped. This cycle is rapid and heat can be conducted away from the heat source. The heat pipe has the advantages of high heat transfer efficiency, compact structure, small fluid resistance loss and the like.

In addition, in this embodiment, the first heat pipe 1 and the second heat pipe 2 are both metal seamless steel pipes, and specifically, different materials, such as copper, aluminum, carbon steel, stainless steel, alloy steel, and the like, may be adopted according to different requirements. The first heat pipe 1 and the second heat pipe 2 may be standard circles, or may be irregular, such as oval, square, rectangular, flat, bellows, etc.

As shown in fig. 1, 2 and 4, the fixing shaft 3 includes a fixing shaft body 32 and a connecting shaft 33 extending out of two ends of the fixing shaft body 32, a second heat transfer channel 31 is formed in the fixing shaft body 32, the rotating component 4 is sleeved on the connecting shaft 33, a connecting hole 34 is formed on the connecting shaft 33 for connecting a mobile terminal, the connecting shaft 33 and the mobile terminal can be connected through the matching of the connecting hole 34 and a fastening member, and the fastening member can be a fixing hinge, a bolt, a screw, or the like.

As shown in fig. 2 and 3, in order to ensure the sealing performance between the rotating assembly 4 and the connecting shaft 33, in this embodiment, a magnetic flow sealing member 5 is disposed between the rotating assembly 4 and the connecting shaft 33, the magnetic flow sealing member 5 includes a magnetizer 51 and a permanent magnet 52, a magnetic groove 53 is disposed on one side of the magnetizer 51 close to the connecting shaft 33, a magnetic fluid 54 is filled in the magnetic groove 53, the magnetizer 51 is used for changing the magnetic field direction, the permanent magnet 52 is used for providing power for attracting the magnetic fluid 54, the magnetic fluid 54 is attracted in the magnetic groove 53 under the magnetic field action of the permanent magnet 52 to form a sealing ring, and a magnetic induction line 55 formed under the magnetic field action can be referred to fig. 3 to seal the connecting shaft 33 and the rotating assembly 4.

In addition, in order to further improve the sealing performance between the rotating assembly 4 and the connecting shaft 33, a plurality of magnetic grooves 53 may be provided, and the plurality of magnetic grooves 53 are spaced along the axial direction (i.e., the x direction shown in fig. 1) of the connecting shaft 33, so that the magnetic fluid 54 filled in the plurality of magnetic grooves 53 is adsorbed in the magnetic grooves 53 under the magnetic field of the permanent magnet 52 to form a plurality of sealing rings, thereby blocking gas exchange to seal the connecting shaft 33 and the rotating assembly 4. Namely, the magnetic fluid 52 can be filled in the magnetic groove 53 under the action of the uniform stable magnetic field, and a multi-stage O-shaped sealing ring is established, so that the sealing effect is achieved; each stage of sealing ring can bear the pressure difference of more than 0.15-0.2 atmospheric pressure generally, and the total pressure resistance is increased along with the increase of the stage number of the liquid O-shaped rings.

The number of the magnetic grooves 53 is set according to actual needs, and the sealing performance is better when the number of the corresponding magnetic grooves 53 is larger. In addition, a plurality of groups of permanent magnets 52 and magnetizers 51 may be provided, which are arranged at intervals along the axial direction of the connecting shaft 33 to form a plurality of groups of sealing structures, so that the sealing performance is better.

In addition, because the magnetic fluid 54 has extremely low saturated vapor pressure and is an oil-based fluid, the sealing structure formed by the magnetic fluid 54 under the action of the magnetic field has the characteristics of no leakage, no loss, high stability and long service life, so as to meet the sealing requirement of the heat dissipation device.

As shown in fig. 2, 3 and 5, the specific structure of the rotating assembly 4 is as follows: the rotating assembly 4 includes a rotating cylinder 42 and a rotating member 43 disposed in the rotating cylinder 42, the rotating member 43 is sleeved on the connecting shaft 33 so that the rotating cylinder 42 is rotatably connected to the connecting shaft 33, and the rotating member 43 may be, for example, a bearing as shown in fig. 2, or may be a rotating sleeve, and is specifically set according to actual requirements.

In addition, when the heat sink is provided with only one rotating assembly 4 as shown in fig. 1, the outer wall of the rotating cylinder 42 is connected with the first heat pipe 1 or the second heat pipe 2, and the stationary shaft 3 is connected with the second heat pipe 2 or the first heat pipe 1, and when the heat sink has two rotating assemblies 4 and two stationary shafts 3 as shown in fig. 4, the first heat pipe 1 and the second heat pipe 2 are both connected with different stationary shafts 3.

As shown in fig. 6, 7 and 8, the present disclosure provides a mobile terminal including a foldable screen 100 and the heat dissipation device for a foldable screen, where the heat dissipation device has the same structure and the same effect or function as the heat dissipation device. The mobile terminal can be a mobile phone, a computer, and the like.

Specifically, for the first mobile terminal structure, as shown in fig. 6, the foldable screen 101 includes two foldable main bodies 101, and the two foldable main bodies 101 can be folded to implement a function of adjusting the screen size, so as to meet the user requirement.

As shown in fig. 6, for the first mobile terminal, since it has only two folding bodies 101, the heat dissipation device thereof may adopt the heat dissipation structure as shown in fig. 1, with particular reference to the above description.

As shown in fig. 7, regarding the structure of the second mobile terminal, the mobile terminal includes three folding main bodies 101, and the heat dissipation device thereof may adopt the heat dissipation structure shown in fig. 4, and specifically refer to the above description.

As shown in fig. 6 and 7, two adjacent folding main bodies 101 are rotatably connected by a main shaft 102, the folding main bodies 101 are connected with the main shaft 102 by a fixed hinge 104, and the fixed shaft 3 and the main shaft 102 can be connected by a fastener, such as a screw or a bolt, cooperating with the connecting hole 34; or, as shown in fig. 8, two adjacent folding main bodies 101 are rotatably connected by corresponding heat dissipation devices, so that the thickness of the body of the mobile terminal is reduced, and the mobile terminal is light and thin.

As shown in fig. 6, in the mobile terminal including two folding bodies 101, the first heat pipe 1 is bonded or soldered to the left folding body 101 and is in contact with the heating element 103 located on the back plate of the left folding body 101, and the second heat pipe 2 is bonded or soldered to the right folding body 101, so that a heat source generated by the operation of the heating element 103 is quickly and effectively conducted to the first heat pipe 1, and heat is transferred to the second heat pipe 2 through the first heat pipe 1, thereby achieving the purpose of temperature equalization. The heating element 103 may be a chip or a control board of the mobile terminal.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation device for a folding screen, wherein the folding screen (100) is provided with at least two folding main bodies (101), and two adjacent folding main bodies (101) are rotatably connected, and the heat dissipation device is characterized by comprising a first heat pipe (1), a second heat pipe (2), a fixed shaft (3) and a rotating component (4);

the first heat pipe (1) is used for being arranged on one of two adjacent folding main bodies (101), the second heat pipe (2) is used for being arranged on the other one of the two adjacent folding main bodies (101), the rotating component (4) and the fixed shaft (3) are coaxially arranged between the two adjacent folding main bodies (101) and are in rotating connection, the first heat pipe (1) is connected with one side of the fixed shaft (3) and is relatively fixed, and the second heat pipe (2) is connected with one side, away from the first heat pipe (1), of the rotating component (4) and is relatively fixed;

the heat pipe is characterized in that a first heat transfer channel (11) is arranged in the first heat pipe (1), a second heat transfer channel (31) is arranged in the fixed shaft (3), a third heat transfer channel (41) is arranged in the rotating component (4), a fourth heat transfer channel (21) is arranged in the second heat pipe (2), and the first heat transfer channel (11), the second heat transfer channel (31), the third heat transfer channel (41) and the fourth heat transfer channel (21) are sequentially communicated to form a heat transfer path, so that cross-plane heat transfer is performed between the first heat pipe (1) and the second heat pipe (2).

2. The heat sink for a folded screen according to claim 1, wherein the first heat transfer channel (11) extends along a length extension direction of the first heat pipe (1), the fourth heat transfer channel (21) extends along a length extension direction of the second heat pipe (2), and the second heat transfer channel (31) and the third heat transfer channel (41) each extend along an axial direction of the rotating assembly (4); the first heat transfer channel (11) is parallel to the fourth heat transfer channel (21), and the second heat transfer channel (31) is perpendicular to the first heat transfer channel (11).

3. The heat dissipation device for a folded screen according to claim 1, wherein the folded screen (100) has at least three folded main bodies (101) rotatably connected in sequence, and of the three adjacent folded main bodies (101), the second heat pipe (2) corresponding to two adjacent folded main bodies (101) is communicated with the first heat pipe (1) corresponding to the other two adjacent folded main bodies (101).

4. A heat sink for a folding screen according to claim 1, wherein a return structure (6) is arranged in the heat transfer path for returning heat transfer medium in the heat transfer path between the first heat pipe (1) and the second heat pipe (2).

5. The heat dissipating device for the foldable screen as claimed in any one of claims 1 to 4, wherein the fixed shaft (3) comprises a fixed shaft body (32) and a connecting shaft (33) extending out of both ends of the fixed shaft body (32), the second heat transfer channel (31) is formed in the fixed shaft body (32), the rotating member (4) is sleeved on the connecting shaft (33), and a connecting hole (34) is formed in the connecting shaft (33) for connecting an external mobile terminal.

6. The heat dissipation device for the foldable screen according to claim 1, wherein a magnetic flow sealing member (5) is disposed between the rotating assembly (4) and the fixed shaft (3), the magnetic flow sealing member (5) comprises a magnetizer (51) and a permanent magnet (52), a magnetic groove (53) is disposed on one side of the magnetizer (51) close to the fixed shaft (3), a magnetic fluid (54) is filled in the magnetic groove (53), and the magnetic fluid (54) is absorbed in the magnetic groove (53) under the magnetic field effect of the permanent magnet (52) to form a sealing ring, so as to seal the fixed shaft (3) and the rotating assembly (4).

7. The heat dissipation device for the foldable screen according to any one of claims 1 to 4, wherein the rotating assembly (4) comprises a rotating cylinder (42) and a rotating member (43) disposed in the rotating cylinder (42), the rotating member (43) is sleeved on the fixed shaft (3) so that the rotating cylinder (42) is rotatably connected with the fixed shaft (3), and when the second heat pipe (2) is connected with the fixed shaft (3), the second heat pipe (2) is connected with the second heat pipe (2) through an outer wall of the rotating cylinder (42).

8. A mobile terminal, characterized in that it comprises a folding screen (100) and a heat sink for a folding screen according to any one of claims 1 to 7, said folding screen (100) comprising at least two folding bodies (101), one said heat sink being provided between two adjacent said folding bodies (101).

9. The mobile terminal according to claim 8, wherein two adjacent folding bodies (101) are rotatably connected by a main shaft (102), and the fixed shaft (3) is connected with the main shaft (102); or, two adjacent folding main bodies (101) are rotatably connected through the corresponding heat dissipation device.

10. The mobile terminal according to claim 8, characterized in that the first heat pipe (1) and the second heat pipe (2) are soldered on the respective folded body (101);

the folding main body (101) is provided with a heating element (103) on one of the two adjacent folding main bodies (101), and the first heat pipe (1) is arranged at the position corresponding to the heating element (103).