Heat pipe for rear housing and mobile device having the heat pipe

Abstract

The invention discloses a heat pipe for a rear housing, including: an outer wall of the heat pipe, an edge of which is provided with a snap-on extending inward; an inner wall of the heat pipe, the size of which is smaller than the size of the outer wall of the heat pipe; a sealing edge strip, the outer wall of the heat pipe is sealed and connected to the inner wall of the heat pipe through the sealing edge strip, so that a sealed heat pipe cavity is formed between the outer wall of the heat pipe, the sealing edge strip and the inner wall of the heat pipe; a liquid wick, which is arranged on the inner wall of the heat pipe cavity; a liquid medium, which is arranged in the heat pipe cavity in a vacuum state; a processing hole, which is opened on the outer wall of the heat pipe, and the processing hole is connected to the heat pipe cavity; a plug, which is used to close the processing hole. Since the heat pipe created by the invention can be directly used as the rear housing of a mobile device, the heat inside the mobile device can be transferred to the outer wall of the heat pipe through the inner wall of the heat pipe without hindrance, so that the heat can be better diffused to the outside of the outer wall of the heat pipe.

Description

Technical Field

[0001] The invention relates to the technical field of heat pipes, and in particular to a heat pipe for a rear housing and a mobile device having the heat pipe. Background Art

[0002] With the popularity of mobile devices, such as mobile phones or tablets, their performance is gradually improving, but the heat dissipation capacity of mobile devices has gradually become a key factor restricting their performance. If a mobile device has poor heat dissipation capacity, the temperature of its internal chip cannot be effectively controlled. In order to avoid chip overheating, the chip will automatically reduce the frequency to reduce power consumption, and the performance of the mobile device will be limited.

[0003] In recent years, there have been many research topics on the heat dissipation of mobile devices, such as chip manufacturing process, application of heat dissipation materials, and improvement of heat dissipation of rear housings. Among them, regarding the research topic of improving the heat dissipation of the rear housing, the existing technology mainly improves it by bonding or burying heat pipes on the heated surface of the rear housing, such as the "Mobile electronic device housing" with publication number CN205681514.U, the "A heat pipe cooling and heat dissipation protective shell" with publication number CN206149684U, and the "Housing and electronic device with the housing" with publication number CN2017070513U. Although the rear housing with a heat pipe can transfer the heat in the chip area to other positions of the rear housing, the heat cannot be better diffused outside the rear housing due to the obstruction of the rear housing. Summary of the invention

[0004] The invention aims to solve at least one of the technical problems existing in the prior art. To this end, the invention proposes a heat pipe which can be directly used as a rear housing of a mobile device so that heat can be better diffused outside the rear housing.

[0005] The invention also provides a mobile device having the heat pipe for the rear housing.

[0006] A heat pipe for a rear housing according to a first embodiment of the present invention includes:

[0007] The outer wall of the heat pipe has a snap-fit ​​piece extending inwardly on its edge;

[0008] The inner wall of the heat pipe has a size smaller than the outer wall of the heat pipe;

[0009] A sealing edge strip, wherein the outer wall of the heat pipe is sealed with the inner wall of the heat pipe by the sealing edge strip, so that a sealed heat pipe cavity is formed between the outer wall of the heat pipe, the sealing edge strip and the inner wall of the heat pipe;

[0010] A liquid wick, which is arranged on the inner wall of the heat pipe cavity;

[0011] A liquid medium is disposed in the heat pipe cavity which is in a vacuum state;

[0012] a processing hole, which is opened on the outer wall of the heat pipe or the inner wall of the heat pipe, and the processing hole is connected to the inner cavity of the heat pipe;

[0013] A plug is used to close the processed hole.

[0014] The heat pipe for the rear housing according to the embodiment of the invention has at least the following beneficial effects: since the heat pipe created by the invention can be directly used as the rear housing of the mobile device, the heat inside the mobile device can be transferred to the outer wall of the heat pipe through the inner wall of the heat pipe without hindrance, so that the heat can be better diffused to the outside of the outer wall of the heat pipe. Compared with the prior art, the heat dissipation capacity created by the invention is better and the structure is more compact and simple.

[0015] According to some embodiments of the present invention, the absorbent core includes a first absorbent portion and a second absorbent portion.

[0016] According to some embodiments of the present invention, the inner wall of the heat pipe and the sealing edge strip are integrally formed.

[0017] According to some embodiments of the present invention, the outer wall of the heat pipe and the sealing edge strip are integrally formed.

[0018] According to some embodiments of the present invention, the first liquid absorption portion is fixedly arranged on the inner side surface of the outer wall of the heat pipe.

[0019] According to some embodiments of the present invention, the second liquid absorption portion is fixedly arranged on the inner side surface of the inner wall of the heat pipe.

[0020] According to some embodiments of the present invention, the outer wall of the heat pipe and the inner wall of the heat pipe are both made of plastic or metal.

[0021] According to some embodiments of the present invention, the inner wall of the heat pipe is a heating surface, and the outer wall of the heat pipe is a heat dissipation surface.

[0022] A mobile device according to a second aspect of an embodiment of the present invention comprises a screen assembly, a chip assembly, a battery, a frame, and the above-mentioned heat pipe for a rear housing, wherein the screen assembly and the heat pipe are respectively connected to two sides of the frame, so that a receiving cavity is formed between the screen assembly, the frame, and the heat pipe, and the chip assembly and the battery are both arranged in the receiving cavity.

[0023] According to some embodiments of the present invention, the chip assembly and the battery are both in contact with the inner wall of the heat pipe.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a front view of a heat pipe according to an embodiment of the invention;

[0027] Figure 2 yes Figure 1 A cross-sectional view of the heat pipe shown along section line AA;

[0028] Figure 3 yes Figure 1 The heat pipe shown is a cross-sectional view along the BB section line.

[0029] In the attached drawings: 100 - outer wall of heat pipe, 200 - inner wall of heat pipe, 210 - sealing edge strip, 110 - fastener, 300 - inner cavity of heat pipe, 120 - boss, 310 - liquid absorption core, 320 - liquid medium, 311 - first liquid absorption part, 312 - second liquid absorption part, 400 - plug, 121 - installation groove, 500 - sealing strip. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the descriptions involving orientation, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0034] As Figures 1 to 3 As shown, the heat pipe for the rear housing according to the first aspect embodiment of the present invention includes a heat pipe outer wall 100, a heat pipe inner wall 200, and a sealing strip 210. The heat pipe outer wall 100, the heat pipe inner wall 200, and the sealing strip 210 are all substantially rectangular. A buckle 110 extending inward is provided on the edge of the heat pipe outer wall 100. The buckle 110 can be a continuously arranged buckle strip or a plurality of spaced card feet. The buckle 110 is mainly used to buckle the heat pipe outer wall 100 on the rear side of the mobile device. Since the heat pipe outer wall 100 is the outermost side of the rear housing and the heat pipe inner wall 200 is the innermost side of the rear housing, that is, the heat pipe inner wall 200 is the heat receiving surface and the heat pipe outer wall 100 is the heat dissipation surface, the size of the heat pipe inner wall 200 is smaller than the size of the heat pipe outer wall 100, and the heat pipe outer wall 100 covers the heat pipe inner wall 200.

[0035] The heat pipe outer wall 100 and the heat pipe inner wall 200 are hermetically connected through the sealing strip 210, so that a sealed heat pipe inner cavity 300 is formed among the heat pipe outer wall 100, the sealing strip 210, and the heat pipe inner wall 200. Specifically, the heat pipe inner wall 200 and the sealing strip 210 are integrally formed, that is, the cross-sectional shape of the heat pipe inner wall 200 is in an inverted "U" shape. A convex platform 120 is provided on the inner side surface of the heat pipe outer wall 100, and a concave plane matching the heat pipe inner wall 200 is provided on the convex platform 120. The heat pipe inner wall 200 is hermetically connected in the concave plane through connection methods such as welding or bonding, or after using a sealing strip 500, the heat pipe inner wall 200 is hermetically connected in the concave plane through connection methods such as welding, bonding, or interference fit. The latter is preferred in this embodiment. It can be understood that even if the sealing strip 210 is integrally formed with the heat pipe outer wall 100 instead, or the sealing strip 210 is separately arranged with the heat pipe outer wall 100 and the heat pipe inner wall 200, the above two implementation manners are within the protection scope of the present invention. In addition, the present invention does not limit the existence of the convex platform 120, and manufacturers can make adaptive configurations according to the structures of different mobile devices.

[0036] Since the heat pipe created by the present invention is not a gravity heat pipe, a liquid wick 310 is provided on the inner wall of the heat pipe inner cavity 300, and an appropriate amount of liquid medium 320 is provided inside the heat pipe inner cavity 300. The liquid wick 310 can provide sufficient liquid capillary force and has a high permeability, so that the liquid in the heat pipe inner cavity 300 can flow back smoothly; in order to reduce the boiling point of the liquid medium 320, it is necessary to perform vacuum treatment on the heat pipe inner cavity 300 so that the liquid medium 320 can be set in the heat pipe inner cavity 300 in a vacuum state. At present, there are two processes for vacuum treatment of the heat pipe inner cavity 300, one is a vacuuming process, and the other is an evaporation exhaust process. Specifically, the liquid absorption core 310 includes a first liquid absorption part 311 and a second liquid absorption part 312. The first liquid absorption part 311 is fixed on the inner side surface of the heat pipe outer wall 100, and the second liquid absorption part 312 is fixed on the inner side surface of the heat pipe inner wall 200. Although the inner side surface of the heat pipe inner wall 200 includes the inner side surface of the sealing edge strip 210, the second liquid absorption part 312 may not be fixed on the inner side surface of the sealing edge strip 210, that is, the second liquid absorption part 312 may be fixedly provided on the inner side surface of the sealing edge strip 210 or not, and the manufacturer may choose according to actual usage. The liquid medium 320 includes but is not limited to water, ethanol, ammonia or acetone. In order to be able to inject the liquid medium 320 into the heat pipe cavity 300, a processing hole is opened on the heat pipe outer wall 100 or the heat pipe inner wall 200, and the processing hole is connected to the heat pipe cavity 300. When the vacuum process is adopted, the processing hole can also be used for vacuuming, and when the evaporation exhaust process is adopted, the processing hole can also be used for exhaust. After the heat pipe processing is completed, the processing hole needs to be closed with a plug 400 to prevent the heat pipe cavity 300 from communicating with the outside world. In order to prevent the liquid medium 320 from flowing out to the mobile device when the heat pipe fails, the processing hole is preferably opened on the heat pipe outer wall 100.

[0037] In some embodiments of the invention, the heat pipe outer wall 100 and the heat pipe inner wall 200 are both made of plastic or metal. Since metal has good thermal conductivity, the outer shell of a general heat pipe is usually made of copper, aluminum or stainless steel. However, since the heat pipe created by the invention is mainly used as the rear shell of a mobile device, and the temperature inside the mobile device generally does not exceed 90°C, even if the heat pipe outer wall 100 and the heat pipe inner wall 200 are both made of plastic, it will not have a significant impact on the heat dissipation effect. In addition, since the rear shell made of metal may have a certain impact on the signal reception and transmission of the mobile device, the heat pipe outer wall 100 and the heat pipe inner wall 200 in this embodiment are preferably made of plastic, specifically including nylon, polycarbonate, PVC, ABS and other plastics. Since polycarbonate has better impact performance and surface quality, polycarbonate is preferably used in this embodiment. It should be further explained that the inventor is currently studying the topic of plastic modification, and the thermal conductivity of the modified plastic is more excellent than that of ordinary plastic. Since the heat pipe outer wall 100 and the heat pipe inner wall 200 are both made of plastic, the liquid medium 320 is preferably water, and the liquid wick should be selected with a structure and material that are compatible with water.

[0038] In some embodiments of the invention, the boss 120 is spaced apart from the fastener 110 of the heat pipe outer wall 100 to form an annular mounting groove 121, and the mounting groove 121 is used to install application modules such as a camera module, a charging module, and a microphone module of a mobile device. The invention does not limit the shape of the mounting groove 121, and the mounting groove 121 can also be divided into two grooves distributed up and down or two grooves distributed left and right, and the manufacturer can make adaptive modifications according to the structure of different mobile devices.

[0039] A mobile device according to a second aspect embodiment of the invention comprises a heat pipe for a rear housing according to the first aspect embodiment of the invention, and also comprises a screen assembly, a chip assembly, a battery and a frame, wherein the screen assembly and the heat pipe are respectively connected to two sides of the frame, so that a receiving cavity is formed between the screen assembly, the frame and the heat pipe, and the chip assembly and the battery are both arranged in the receiving cavity, and the chip assembly and the battery are both in contact with the inner wall 200 of the heat pipe, so that the heat generated by the chip assembly and the battery can be transferred to the outer wall 100 of the heat pipe through the inner wall 200 of the heat pipe.

[0040] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A heat pipe for a rear housing, characterized in that: include: The outer wall (100) of the heat pipe has a snap-fitting piece (110) extending inwardly on its edge, and a boss (120) is provided on the inner side surface of the outer wall (100) of the heat pipe, and the bosses (120) are respectively arranged at intervals with the snap-fitting piece (110) of the outer wall (100) of the heat pipe to form an annular mounting groove (121); The inner wall (200) of the heat pipe has a size smaller than the outer wall (100) of the heat pipe, and the boss (120) is provided with a concave plane matching the inner wall (200) of the heat pipe; A sealing edge strip (210), wherein the heat pipe outer wall (100) and the heat pipe inner wall (200) are sealed and connected via the sealing edge strip (210), so that a sealed heat pipe inner cavity (300) is formed between the heat pipe outer wall (100), the sealing edge strip (210) and the heat pipe inner wall (200), and at this time, the heat pipe inner wall (200) is sealed and connected within the concave plane; A liquid wick (310) disposed on the inner wall of the heat pipe inner cavity (300); A liquid medium (320) is disposed in the heat pipe cavity (300) which is in a vacuum state; a processing hole, which is opened on the outer wall (100) of the heat pipe or the inner wall (200) of the heat pipe, and the processing hole is connected to the inner cavity (300) of the heat pipe; A plug (400) is used to close the processed hole.

2. The heat pipe for the rear housing according to claim 1, characterized in that: The liquid absorbent core (310) comprises a first liquid absorbent portion (311) and a second liquid absorbent portion (312).

3. The heat pipe for the rear housing according to claim 2, characterized in that: The heat pipe inner wall (200) and the sealing edge strip (210) are integrally formed.

4. The heat pipe for the rear housing according to claim 2, characterized in that: The heat pipe outer wall (100) and the sealing edge strip (210) are integrally formed.

5. The heat pipe for the rear housing according to claim 3 or 4, characterized in that: The first liquid absorption portion (311) is fixedly arranged on the inner side surface of the outer wall (100) of the heat pipe.

6. The heat pipe for the rear housing according to claim 3 or 4, characterized in that: The second liquid absorption portion (312) is fixedly arranged on the inner side surface of the inner wall (200) of the heat pipe.

7. The heat pipe for the rear housing according to claim 1, characterized in that: The heat pipe outer wall (100) and the heat pipe inner wall (200) are both made of plastic or metal.

8. The heat pipe for the rear housing according to claim 1, characterized in that: The inner wall (200) of the heat pipe is a heating surface, and the outer wall (100) of the heat pipe is a heat dissipation surface.

9. A mobile device, characterized in that The heat pipe for the rear housing comprises the heat pipe as described in any one of claims 1 to 8, and further comprises: a screen assembly, a chip assembly, a battery and a frame, wherein the screen assembly and the heat pipe are respectively connected to two sides of the frame, so that a receiving cavity is formed between the screen assembly, the frame and the heat pipe, and the chip assembly and the battery are both arranged in the receiving cavity.

10. The mobile device according to claim 9, characterized in that: The chip assembly and the battery are both in contact with the inner wall (200) of the heat pipe.

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