Digital network set top box with good heat dissipation

Abstract

The invention discloses a digital network set top box with good heat dissipation, which relates to the technical field of set top boxes, and comprises a shell, a cover body, a circuit board, a heat dissipation sheet and a heat dissipation device, the interior of the housing is provided with an installation space for the installation of the circuit board, and the installation space is provided with an opening at one side of the housing. The cover body is detachably connected with the shell, and the cover body can cover the opening of the mounting space; the cooling fins are arranged on the circuit board, and after the circuit board is installed in the installation space, the cooling fins are located above the circuit board; the heat dissipation device comprises a heat conduction piece; the heat conduction piece is arranged on the cover body, and when the cover body and the circuit board are installed, the heat conduction piece is located below the cover body, and the heat conduction piece abuts against the cooling fins in a contact mode. According to the invention, the heat dissipation effect of the set top box can be effectively improved without introducing an active heat dissipation mechanism.

Description

Technical Field

[0001] The present application relates to the technical field of set-top boxes, and in particular to a digital network set-top box with good heat dissipation. Background Art

[0002] With the development of digital network technology, set-top boxes are becoming more and more powerful, integrating more multimedia processing capabilities and Internet functions. However, these advanced functions lead to higher power consumption, which in turn generates more heat. If effective heat dissipation measures are not taken, it may cause the device to overheat, resulting in performance degradation or even hardware damage, seriously affecting the user experience.

[0003] Most set-top boxes on the market today still rely on traditional passive cooling methods, such as metal casings and natural air cooling, which is adequate for early low-power models but inadequate for modern high-power devices.

[0004] Existing set-top box heat dissipation solutions mainly include: 1. Increasing the volume of the chassis to expand the heat dissipation area, but this limits the portability and aesthetics of the product; 2. Introducing active heat dissipation mechanisms, such as built-in fans, which can significantly improve heat dissipation efficiency, but due to the increase of additional noise sources and maintenance costs, this method has not been widely popularized.

[0005] Both of the above solutions have their limitations and cannot fully meet the needs of modern high-power set-top boxes. Traditional heat dissipation methods cannot meet the requirements of high integration and high performance of current digital network set-top boxes, especially in a limited space, where efficient heat dissipation has become a major challenge. Increasing the size of the chassis will affect the market competitiveness of the product, while the introduction of fans will bring new noise pollution problems and increase the failure rate. Summary of the invention

[0006] The present application provides a digital network set-top box with good heat dissipation, which can effectively improve the heat dissipation effect of the set-top box without introducing an active heat dissipation mechanism.

[0007] The present application provides a digital network set-top box with good heat dissipation, which adopts the following technical solution: A digital network set-top box with good heat dissipation, comprising a shell, a cover, a circuit board, a heat sink and a heat dissipation device; The housing has an installation space inside for installing the circuit board, and the installation space forms an opening on one side of the housing; The cover body is detachably connected to the housing, and the cover body can cover the opening of the installation space; The heat sink is arranged on the circuit board, and after the circuit board is installed in the installation space, the heat sink is located above the circuit board; The heat dissipation device comprises a heat conductive member; the heat conductive member is arranged on the cover body, and when the cover body and the circuit board are installed, the heat conductive member is located below the cover body, and the heat conductive member contacts and abuts against the heat sink.

[0008] By adopting the above technical solution, when the set-top box is in use, the heat generated by the circuit board can be transferred to the heat conductor through the heat sink, and then transferred to the cover and the shell through the heat conductor, thereby effectively improving the heat dissipation effect of the set-top box without introducing an active heat dissipation mechanism.

[0009] Optionally, a plurality of heat dissipation openings are formed through the cover body, and the heat conducting member covers the openings of the plurality of heat dissipation openings simultaneously.

[0010] By adopting the above technical solution, the heat-conducting component can conveniently dissipate heat to the outside air through the heat dissipation port, thereby further improving the heat dissipation effect of the set-top box.

[0011] Optionally, the heat dissipation device includes a plurality of heat dissipation elements and expansion and contraction components; The heat conducting member has a cavity inside, and the cavity is communicated with the plurality of heat dissipation openings at the same time; The expansion and contraction component is arranged at a position of the cavity away from the heat dissipation port, and the expansion and contraction component comprises a fixed part, a movable part and a filler; the fixed part is fixedly connected to the heat conducting part, the movable part is movably connected to the fixed part, an expansion and contraction space is formed between the movable part and the fixed part, and the filler has the performance of thermal expansion and contraction and can fill the expansion and contraction space; The plurality of heat sinks correspond one-to-one to the plurality of heat dissipation openings, the heat sinks are movable relative to the heat conducting element, and the movement direction of the heat sinks is parallel to the movement direction of the movable element; one end of the heat sink is connected to the movable element, and the other end of the heat sink is movable through the corresponding heat dissipation opening.

[0012] By adopting the above technical solution, more parts of the multiple heat sinks pass through the heat dissipation ports as the circuit board generates more heat, thereby improving the heat dissipation effect of the heat dissipation device. At the same time, the expansion and contraction components can absorb the heat transferred to the heat conductive member, so that the heat dissipation effect of the set-top box can be changed according to the amount of heat generated, thereby facilitating timely and effective heat dissipation of the set-top box.

[0013] Optionally, a plurality of the heat sinks are interconnected, and both the fixed member and the movable member are thermally conductive.

[0014] By adopting the above technical solution, it is convenient for the filler in the expansion and contraction space to absorb heat, and it is convenient for the set-top box to dissipate heat through the heat sink.

[0015] Optionally, a plurality of heat dissipation holes are formed through the heat dissipation element; when the heat dissipation element moves to an extreme position in a direction away from the fixing element, the heat dissipation holes are located on a side of the cover body away from the heat conducting element.

[0016] By adopting the above technical solution, the contact area between the heat sink and the outside air can be expanded, thereby improving the heat dissipation effect of the heat sink, and at the same time facilitating the outside air to flow through the heat dissipation holes to take away the heat of the heat sink.

[0017] Optionally, the plurality of heat dissipation holes on adjacent heat dissipation elements are staggered.

[0018] By adopting the above technical solution, after the outside air flows through the heat dissipation holes, it will contact the adjacent heat dissipation element and then pass through the heat dissipation holes, thereby extending the time that the outside air flows through the mirror tube heat dissipation element, thereby improving the heat dissipation effect of the heat dissipation element in this process.

[0019] Optionally, the heat sink extends along a wave trajectory, and the movement direction of the heat sink is perpendicular to its own wave trajectory.

[0020] By adopting the above technical solution, the contact area between the heat sink and the outside air can be further expanded, thereby further improving the heat dissipation effect of the heat sink.

[0021] Optionally, the filler is mercury.

[0022] Optionally, a visible portion is extended outwardly from one end of the fixing member, the visible portion passes through the heat sink, and the housing is provided with a clearance groove matched with the visible portion; The visible portion is provided with a visible window for conveniently observing the expansion and contraction space, and a scale for displaying temperature is marked on one side of the visible window on the visible portion.

[0023] By adopting the above technical solution, the user can conveniently judge the heating condition of the set-top box by observing the scale displayed by mercury on the visual window through the visual part, so that the user can conveniently take cooling measures for the overheated set-top box in time.

[0024] Optionally, a plurality of air holes communicating with the installation space are formed on the peripheral side of the shell.

[0025] By adopting the above technical solution, the heat of the circuit board can be dissipated to the outside through the ventilation holes, thereby further improving the heat dissipation effect of the set-top box.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. It can effectively improve the heat dissipation effect of the set-top box without introducing an active heat dissipation mechanism; 2. The heat dissipation effect of the set-top box can change according to the heating of the set-top box, so that the heat can be dissipated in time and effectively; 3. It is convenient for users to know the heating condition of the set-top box, so that users can cool down the set-top box in time when the set-top box is overheated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a digital network set-top box with good heat dissipation when the temperature is low in an embodiment of the present application; Figure 2 This is a structural schematic diagram of a digital network set-top box with good heat dissipation when the temperature is high in an embodiment of the present application; Figure 3 This is a cross-sectional view of a digital network set-top box with good heat dissipation along the length direction of the shell when the temperature is low in the embodiment of the present application; Figure 4 This is a cross-sectional view of a digital network set-top box with good heat dissipation along the length direction of the shell when the temperature is high in the embodiment of the present application; Figure 5 is a cross-sectional view of a digital network set-top box with good heat dissipation along the width direction of the shell when the temperature is low in the embodiment of the present application; Figure 6 This is a cross-sectional view along the width direction of the shell of a digital network set-top box with good heat dissipation when the temperature is high in an embodiment of the present application.

[0028] Explanation of the reference numerals: 1. Shell; 11. Installation space; 12. Air vent; 13. Give way groove; 2. Circuit board; 3. Cover; 31. Heat dissipation port; 4. Heat sink; 5. Heat dissipation device; 51. Heat conducting member; 511. Cavity; 512. Through groove; 52. Expansion and contraction assembly; 521. Fixing member; 5211. Visible portion; 5212. Visible window; 5213. Scale; 522. Movable member; 523. Filler; 524. Expansion and contraction space; 53. Heat dissipating member; 531. Heat dissipating hole. DETAILED DESCRIPTION

[0029] The following combination Figure 1-Figure 6 This application is described in further detail.

[0030] Reference Figure 1 and Figure 2 The embodiment of the present application discloses a digital network set-top box with good heat dissipation, which has good heat dissipation effect and can perform heat dissipation to different degrees according to its own temperature.

[0031] Reference Figure 1 and Figure 3The set-top box includes a housing 1, a circuit board 2, a cover 3, a heat sink 4 and a heat dissipation device 5. The circuit board 2 is used to realize the functions of the set-top box and will generate heat during operation; the housing 1 and the cover 3 jointly protect the circuit board 2; the heat sink 4 and the heat dissipation device 5 jointly dissipate heat for the set-top box.

[0032] The shell 1 is a rectangular parallelepiped structure as a whole. The inside of the shell 1 has an installation space 11 for installing the circuit board 2, and the installation space 11 penetrates one side of the shell 1 in the thickness direction to form an opening; the peripheral side of the shell 1 is provided with a plurality of air holes 12 that communicate with the installation space 11. During the use of the set-top box, the heat generated by the circuit board 2 can be dissipated in the installation space 11 first, and then dissipated to the air outside the set-top box through the plurality of air holes 12. In this embodiment, the shell 1 is preferably made of a plastic with high thermal conductivity, and the surface of the shell 1 preferably has a metal heat dissipation layer; since the above-mentioned shell 1 is a common prior art, and the plastic with the above-mentioned function is also a common material in the art, the shell 1 will not be described in detail here, and the shell 1 is only briefly indicated in the drawings, and the material of the plastic with the above-mentioned function is not further limited.

[0033] The circuit board 2 is a rectangular plate-shaped structure as a whole, and can be fixed relative to the housing 1 after being installed in the installation space 11. In this embodiment, since the circuit board 2 is a prior art in the art, it is not described here in detail, and is only briefly shown in the drawings.

[0034] The cover body 3 is a rectangular plate-shaped structure as a whole. The cover body 3 is detachably connected to the side of the housing 1 near the opening of the installation space 11, and the cover body 3 can cover the opening of the installation space 11 after being connected to the housing 1. In this embodiment, the cover body 3 is preferably detachably connected to the housing 1 by a plurality of screws; since the above-mentioned detachable connection method is a common prior art, it will not be described in detail here, and it is omitted in the drawings.

[0035] The heat sink 4 is fixedly mounted on the circuit board 2. The heat generated during the operation of the circuit board 2 will be mainly dissipated through the heat sink 4. When the circuit board 2 is installed and fixed in the installation space 11, the heat sink 4 will be located above the circuit board 2. In this embodiment, the heat sink 4 is preferably centered on the circuit board 2, and the heat sink 4 is preferably made of aluminum alloy; since the heat sink 4 with the above-mentioned function is a prior art in the art, it will not be described in detail here, and it is only briefly shown in the drawings.

[0036] The heat dissipation device 5 is installed on the cover 3. When the cover 3 is connected to the housing 1, the heat dissipation device 5 will be located above the heat sink 4. The heat dissipation device 5 includes a heat conducting member 51, a plurality of heat dissipating members 53 and an expansion and contraction assembly 52. ​​The heat conducting member 51 facilitates the heat transferred from the circuit board 2 to the heat sink 4 to be transferred outwards; the heat dissipating member 53 facilitates the heat transferred from the heat conducting member 51 to be dissipated to the outside air; the expansion and contraction assembly 52 can change the heat dissipation effect of the heat dissipation device 5 according to the heat generated by the circuit board 2, so that the heat dissipation device 5 can timely and effectively dissipate the heat generated by the operation of the circuit board 2 to the outside.

[0037] The heat conducting member 51 is a rectangular plate-shaped structure as a whole. The heat conducting member 51 is fixedly mounted on the cover 3. After the cover 3 is connected to the housing 1, the heat conducting member 51 will be located below the cover 3. In this embodiment, the heat conducting member 51 is preferably centered on the cover 3, and the heat conducting member 51 is preferably made of a metal material with high thermal conductivity; since the above metal material is a prior art in the art, it is not further limited here.

[0038] The interior of the heat conducting member 51 has a cavity 511 for installing multiple heat sinks 53 and expansion / contraction components 52, and the cavity 511 passes through the heat conducting member 51 to form an opening on the side close to the cover body 3; the cover body 3 is penetrated by multiple heat dissipation ports 31 for the heat sink 53 to pass through, and at this time, the opening of the cavity 511 can communicate with the external space on the side of the cover body 3 away from the heat conducting member 51 through the multiple heat dissipation ports 31.

[0039] When the cover 3 is connected to the housing 1, the heat conducting member 51 and the heat sink 4 can contact and abut each other, so that the heat generated by the circuit board 2 can be transferred to the heat conducting member 51 through the heat sink 4, and then the heat on the heat conducting member 51 can be dissipated outward through the cover 3 and other structures. In practical applications, it is preferred that a layer of heat conducting foam is fixedly installed on the side of the heat conducting member 51 away from the cover 3, so as to reduce the wear of the heat conducting member 51 and the heat sink 53 caused by contact between the two, and effectively ensure the effect of the heat sink 4 transferring heat to the heat conducting member 51.

[0040] Reference Figure 3 and Figure 4 The expansion and contraction assembly 52 is mounted on the heat-conducting member 51 and is located in the cavity 511 away from the heat dissipation port 31. The expansion and contraction assembly 52 includes a fixing member 521, a movable member 522 and a filler 523. The fixing member 521 is used to fix the expansion and contraction assembly 52 on the heat-conducting member 51; the movable member 522 can move relative to the fixing member 521; and the filler 523 has the property of thermal expansion and contraction, so that it can expand and contract with temperature changes to drive the movable member 522 to move.

[0041] The fixing member 521 is fixedly installed on the heat-conducting member 51 and is located at a position of the cavity 511 away from the heat dissipation port 31. The movable member 522 is movably connected to the fixing member 521, and the movement direction of the movable member 522 is parallel to the thickness direction of the heat-conducting member 51 and the opening direction of the heat dissipation port 31. An expansion and contraction space 524 for filling with a filler 523 is formed between the movable member 522 and the fixing member 521. During the movement of the movable member 522 relative to the fixing member 521, the expansion and contraction space 524 will remain closed, and a distance is maintained between the movable member 522 and the inner wall of the cavity 511 on the side close to the heat dissipation port 31.

[0042] The filler 523 is mercury, the fixed part 521 is in contact with the heat conducting part 51 and against it, and the movable part 522 also keeps in contact with the heat conducting part 51 and against it during the movement. After the heat conducting part 51 absorbs the heat of the heat sink 4, the heat can be transferred to the filler 523 located in the expansion and contraction space 524 through the fixed part 521 and the movable part 522. After the filler 523 absorbs the heat, it expands due to the heat and can drive the movable part 522 to move in the direction close to the heat dissipation port 31. After the filler 523 dissipates the heat, it contracts due to heat release and can drive the movable part 522 to move in the direction away from the heat dissipation port 31.

[0043] Reference Figure 1 and Figure 5 A visible portion 5211 extends outward from one side of the fixing member 521, a through groove 512 is correspondingly provided on one side of the heat-conducting member 51 for the visible portion 5211 to pass through, and a clearance groove 13 adapted to the visible portion 5211 is correspondingly provided on one side of the shell 1; at this time, the end of the visible portion 5211 is snap-fitted with the clearance groove 13, and at this time, the outer surface of the end of the visible portion 5211 is respectively fitted against the groove wall of the clearance groove 13 and the surface of the cover body 3, and its end face is flush with the outer surface of the shell 1.

[0044] Reference Figure 5 and Figure 6 The visible portion 5211 is internally provided with a light-transmissive visible window 5212 through which the user can observe. The user can observe the expansion and contraction of the filler 523 in the expansion and contraction space 524 through the visible window 5212, and a scale 5213 for indicating the temperature is marked on the surface of the end portion of the visible portion 5211 on one side of the visible window 5212; when the user observes through the visible window 5212 that the liquid level of the filler 523 in the expansion and contraction space 524 changes with the temperature, the user can know the temperature of the set-top box at this time according to the scale 5213, thereby facilitating the user to judge whether the set-top box is allowed to be used and whether it needs to be cooled, so as to improve the safety of the set-top box during use, and at the same time can effectively extend the service life of the set-top box.

[0045] In practical applications, in order to facilitate users to prevent overheating of the set-top box, it is preferred that a temperature alarm is installed on the set-top box. By setting a safe temperature range, when the temperature of the set-top box exceeds a certain value, the temperature alarm can sound an alarm to remind the user. In this embodiment, since the above method is a common prior art, it is not described in detail here, and the temperature alarm is omitted in the drawings.

[0046] Reference Figure 2 and Figure 4 , multiple heat sinks 53 correspond to multiple heat dissipation ports 31 one by one, the heat sink 53 is a sheet-like structure as a whole, one end of the heat sink 53 is fixedly connected to the movable part 522, and the other end of the heat sink 53 can pass through the corresponding heat dissipation port 31 as the movable part 522 moves and enters and exits the set-top box; the heat sink 53 can absorb the heat on the heat conductive part 51 and the heat on the movable part 522, thereby further facilitating the heat dissipation to the outside.

[0047] Reference Figure 3 and Figure 4 When the movable member 522 moves to the extreme position in the direction close to the fixed member 521, the plurality of heat sinks 53 will be located in the cavity 511. At this time, the cavity 511 can be directly connected to the external space through the plurality of heat dissipation openings 31, and the heat on the heat sink 53 can be firstly dissipated to the air in the cavity 511, and then dissipated to the external air through the plurality of heat dissipation openings 31; When the movable part 522 moves to the extreme position in the direction away from the fixed part 521, the portion of the heat sink 53 located in the external space after passing through the corresponding heat dissipation openings 31 is the largest. At this time, the cavity 511 can still communicate with the external space through multiple heat dissipation openings 31, but the heat on the heat sink 53 will be mainly dissipated directly into the external air.

[0048] Reference Figure 2 and Figure 4 Furthermore, in order to improve the heat dissipation effect of the heat sink 53, it is preferred that the heat sink 53 has a sheet structure with a wavy trajectory, and the direction in which the heat sink 53 moves with the movement of the movable part 522 is perpendicular to its own wavy trajectory, and the shape of the corresponding heat dissipation port 31 is adapted to the wavy shape of the heat sink 53.

[0049] At this time, the surface areas of both sides of the heat sink 53 are increased, which can effectively expand its contact area with the air, thereby effectively improving the effect of the heat sink 53 dissipating heat into the air, and further effectively improving the heat dissipation effect of the heat sink 53.

[0050] At the same time, when the movable part 522 moves to the extreme position in the direction away from the fixed part 521, the external air flows into the channel formed between the adjacent heat sinks 53. In the process of passing through the heat sink 53, the air can fully contact the wave trajectory side of the heat sink 53 and can extend the time for the air to flow through, thereby effectively improving the effect of the heat sink 53 in radiating heat to the outside.

[0051] Furthermore, in order to improve the heat dissipation effect of the heat sink 53 when the movable part 522 moves to the extreme position in the direction away from the fixed part 521, it is preferred that a plurality of heat dissipation holes 531 are opened through the heat sink 53, and the plurality of heat dissipation holes 531 are evenly spaced on the heat sink 53 along the wave trajectory of the heat sink 53.

[0052] At this time, when the external air flow contacts one side surface of the heat sink 53, the air will flow along the wave trajectory surface of the heat sink 53 and then pass through the heat sink 53 through multiple heat dissipation holes 531. The process of air passing through the heat dissipation holes 531 can also promote the external heat dissipation of the heat sink 53.

[0053] Furthermore, in order to further improve the heat dissipation effect of the heat sink 53 when the movable part 522 moves to the extreme position in the direction away from the fixed part 521, the positions of the multiple heat dissipation holes 531 on adjacent heat sinks 53 are preferably relatively staggered along their own wave trajectory.

[0054] At this time, when the outside air flows and contacts one side surface of the heat sink 53, the air will flow along the wavy trajectory surface of the heat sink 53, and then pass through the heat dissipation holes 531 on the heat sink 53 and contact one side surface of the next heat sink 53, and then flow along the wavy trajectory surface of the new heat sink 53, so as to circulate through multiple heat sinks 53 in sequence, thereby further effectively improving the effect of the heat sink 53 in radiating heat to the outside.

[0055] The implementation principle of a digital network set-top box with good heat dissipation in the embodiment of the present application is as follows: During the use of the set-top box, as the circuit board 2 runs, heat is generated. On the one hand, the heat can be dissipated into the air in the installation space 11 and then dissipated outward through the plurality of air holes 12; on the other hand, the heat can be transferred to the heat conducting member 51 through the heat sink. On the one hand, the heat on the heat-conducting member 51 can be transferred to the shell 1 and then dissipated outward through the shell 1; on the other hand, the heat can be transferred to the expansion and contraction component 52. The filler 523 in the expansion and contraction space 524 can absorb heat and expand due to the heat, thereby driving the movable member 522 to move so that the multiple heat sinks 53 are exposed through the multiple heat dissipation ports 31. This makes it convenient for the heat sink 53 to dissipate the heat to the outside, and it is also convenient for the user to judge the temperature of the set-top box at this time through the visual window 5212 and the scale 5213, so that the user can cool down the set-top box in time when it is overheated.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A digital network set-top box with good heat dissipation, characterized in that: It comprises a housing (1), a cover (3), a circuit board (2), a heat sink (4) and a heat dissipation device (5); The housing (1) has an installation space (11) inside for installing the circuit board (2), and the installation space (11) forms an opening on one side of the housing (1); The cover body (3) is detachably connected to the housing (1), and the cover body (3) is capable of covering the opening of the installation space (11); The heat sink (4) is arranged on the circuit board (2); after the circuit board (2) is installed in the installation space (11), the heat sink (4) is located above the circuit board (2); The heat dissipation device (5) comprises a heat conducting member (51); the heat conducting member (51) is arranged on the cover body (3); when the cover body (3) and the circuit board (2) are both installed, the heat conducting member (51) is located below the cover body (3), and the heat conducting member (51) contacts and abuts against the heat sink (4).

2. A digital network set-top box with good heat dissipation according to claim 1, characterized in that: The cover body (3) is provided with a plurality of heat dissipation openings (31) extending therethrough, and the heat conducting member (51) simultaneously covers the openings of the plurality of heat dissipation openings (31).

3. A digital network set-top box with good heat dissipation according to claim 2, characterized in that: The heat dissipation device (5) comprises a plurality of heat dissipation elements (53) and an expansion and contraction assembly (52); The heat conducting member (51) has a cavity (511) inside, and the cavity (511) is simultaneously in communication with the plurality of heat dissipation openings (31); The expansion and contraction component (52) is arranged at a position of the cavity (511) away from the heat dissipation port (31), and the expansion and contraction component (52) comprises a fixed component (521), a movable component (522) and a filler (523); the fixed component (521) is fixedly connected to the heat conducting component (51), the movable component (522) is movably connected to the fixed component (521), an expansion and contraction space (524) is formed between the movable component (522) and the fixed component (521), and the filler (523) has the property of thermal expansion and thermal contraction and can fill the expansion and contraction space (524); The plurality of heat sinks (53) correspond one-to-one to the plurality of heat dissipation openings (31); the heat sinks (53) are movable relative to the heat-conducting element (51), and the movable direction of the heat sink (53) is parallel to the movable direction of the movable element (522); one end of the heat sink (53) is connected to the movable element (522), and the other end of the heat sink (53) is movable through the corresponding heat dissipation opening (31).

4. A digital network set-top box with good heat dissipation according to claim 3, characterized in that: The plurality of heat sinks (53) are connected to each other, and both the fixed component (521) and the movable component (522) are thermally conductive.

5. A digital network set-top box with good heat dissipation according to claim 4, characterized in that: The heat sink (53) is provided with a plurality of heat dissipation holes (531); when the heat sink (53) moves to an extreme position in a direction away from the fixing member (521), the heat dissipation holes (531) are located on a side of the cover body (3) away from the heat conducting member (51).

6. A digital network set-top box with good heat dissipation according to claim 5, characterized in that: The plurality of heat dissipation holes (531) on adjacent heat dissipation elements (53) are distributed in a staggered manner.

7. A digital network set-top box with good heat dissipation according to claim 5, characterized in that: The heat sink (53) extends along a wave trajectory, and the movement direction of the heat sink (53) is perpendicular to its own wave trajectory.

8. A digital network set-top box with good heat dissipation according to claim 3, characterized in that: The filler (523) is mercury.

9. A digital network set-top box with good heat dissipation according to claim 8, characterized in that: A visible portion (5211) is extended outwardly from one end of the fixing member (521), the visible portion (5211) passes through the heat sink (53), and a clearance groove (13) adapted to the visible portion (5211) is provided on the housing (1); The visible portion (5211) is provided with a visible window (5212) for facilitating observation of the expansion and contraction space (524), and a scale (5213) for displaying temperature is marked on one side of the visible window (5212) on the visible portion (5211).

10. A digital network set-top box with good heat dissipation according to claim 1, characterized in that: A plurality of air holes (12) communicating with the installation space (11) are provided on the peripheral side of the shell (1).

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