A heat dissipation module, a mobile terminal and an electronic device

Abstract

The application relates to the wireless communication technical field, discloses a heat dissipation module, an electronic device and a mobile terminal. The heat dissipation module of the application is applied to the mobile terminal, and comprises a mounting part, a rotating part and a first jet flow piezoelectric fan. The mounting part is used for being mounted on the mobile terminal, the rotating part is rotationally connected with the mounting part, and the first jet flow piezoelectric fan is arranged on the rotating part. The jet flow piezoelectric fan comprises a jet flow port, the jet flow port is used for being directed to a heating surface of the mobile terminal, and the jet flow port is used for flowing in / out of fluid. The heat dissipation module of the application can be externally arranged on the mobile terminal without occupying the internal space of the mobile terminal, is simple to maintain and clean, is beneficial to the light and thin production of the mobile terminal, has a better heat dissipation effect, and can selectively dissipate heat according to different positions of the mobile terminal.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a heat dissipation module, a mobile terminal, and an electronic device. Background Technology

[0002] With the miniaturization of electronic components, changes in user needs and mainstream aesthetics, the design of smart terminal devices is increasingly trending towards thinner and lighter designs. However, traditional heat dissipation methods conflict with this trend. At the same time, as the performance of smart terminal devices continues to improve, their heat generation also increases. To ensure they maintain a suitable operating temperature during operation, researching thermal design that can simultaneously meet the requirements of thinner and lighter designs while maintaining high heat dissipation performance has become an important issue for smart terminal devices.

[0003] Taking mobile phones as an example of smart terminal devices, mobile phone heat dissipation products can be divided into two types based on different heat dissipation principles: active heat dissipation and passive heat dissipation.

[0004] Active cooling products utilize the principle of thermal convection to forcibly dissipate heat from a hot phone, such as fans, water pumps in liquid cooling systems, and compressors in phase-change refrigeration. Active cooling products are characterized by high efficiency, but require auxiliary energy sources. Furthermore, this cooling method necessitates the installation of air inlets and outlets on the phone's surface, along with corresponding dust filters. Dust and unusual noises during use can affect the phone's reliability and performance, while repairs require disassembly, impacting the appearance and overall waterproofing and dustproofing. This limits its application and conflicts with the requirements of a slim, lightweight design and high reliability.

[0005] In addition, some mobile phones use heat dissipation back clips for heat dissipation. These back clips are installed on the back cover of the phone and are equipped with mechanical fans (such as mechanical axial fans or centrifugal fans) to blow air onto the back cover of the phone to dissipate heat. However, the heat dissipation effect of such mechanical fans is relatively average. They often require components such as metal fins, heat pipes, and thermal interface materials to enhance air convection and improve the heat dissipation effect. Although this does not affect the ultra-thin and ultra-lightweight design of the phone itself, it cannot achieve a compact size and light weight, and it is noisy, which is not accepted by consumers. Its application scenarios are relatively limited, and it is only used by a small number of gaming enthusiasts.

[0006] Passive cooling products utilize the principle of heat conduction, relying solely on a heat-generating element or heat sink to cool heat-generating components. Thin and light mobile terminals such as smartphones and tablets, limited by their internal space, often employ passive cooling solutions. Passive cooling heat sinks include graphite heat dissipation films, graphene, heat pipes (HP), and vapor chambers (VC). Because the micro-surfaces of the heat-generating element and the heat sink are uneven, the effective contact area between them is blocked by air, hindering effective heat dissipation. Passive cooling systems for mobile phones need to fill the gaps between the heat-generating element and the heat sink with thermally conductive interface materials to improve heat dissipation efficiency. However, due to the limited size and thickness of mobile phones, the internal space is limited, reducing the cooling capacity of passive cooling. Constrained by limited volume and external surface area, passive cooling has an upper limit, especially for mobile terminal products like smartphones and smartwatches that are in close contact with the human body, and it can no longer meet future demands.

[0007] Therefore, existing traditional heat dissipation methods (active and passive heat dissipation) are difficult to reconcile with thin and light mobile phone designs and high heat dissipation and high reliability, and cannot better meet the power consumption requirements of applications such as artificial intelligence (AI), gaming, video calls, and satellite communications. Summary of the Invention

[0008] To address the aforementioned technical problems, embodiments of this application provide a heat dissipation module, a mobile terminal, and an electronic device. The heat dissipation module of this application can be externally mounted on the mobile terminal without occupying internal space, is easy to maintain, has high reliability, and is beneficial for the production of thinner and lighter mobile terminals. Furthermore, the heat dissipation module has excellent heat dissipation capabilities and can selectively dissipate heat for different locations on the mobile terminal.

[0009] The present application is described below from multiple aspects, and the implementation methods and beneficial effects of these aspects can be referred to each other.

[0010] The first aspect of this application provides a heat dissipation module for use in a mobile terminal. The heat dissipation module includes: a mounting part for mounting on the mobile terminal; a rotating part rotatably connected to the mounting part; and a first jet piezoelectric fan disposed on the rotating part. The first jet piezoelectric fan includes a jet port for facing the heat-generating surface of the mobile terminal and for fluid to enter / exit.

[0011] By adopting the above technical solution, on the one hand, the heat dissipation module provided in this application embodiment can be externally placed on the heat-generating surface of a mobile terminal (this article takes a mobile phone as an example, but it can be extended to mobile terminal products such as smartwatches) through the mounting part (also known as a heat dissipation back clip). It can also be understood that the heat dissipation module can be used as an external accessory for the mobile phone. In other words, the heat dissipation module in this application embodiment is not set inside the mobile phone and does not occupy the internal space of the mobile phone. At the same time, it does not conflict with the design of the mobile phone body and does not affect the internal design of the mobile phone, such as the industrial design (ID), board area, waterproof and dustproof design, etc.

[0012] On the other hand, users can selectively dissipate heat from the phone's heat-generating surfaces (such as the heat-generating surface of the phone's back cover) through the mounting and rotating parts.

[0013] Specifically, the mounting unit can be detachably mounted on the phone, meaning users can choose and adjust its installation position to selectively dissipate heat from the heated surface. For example, the heated surface of the back cover may be locally hot; if a user feels that a certain area of ​​the heated surface is the hottest while using the phone, the mounting unit can be installed closer to that area.

[0014] Meanwhile, the rotating part is rotatably connected to the aforementioned mounting part, and a first jet piezoelectric fan is provided on the rotating part. The jet outlet of the first jet piezoelectric fan faces the heat-generating surface of the back cover. The first jet piezoelectric fan can change the orientation of the jet outlet as the rotating part rotates, thereby changing the airflow position of the first jet piezoelectric fan relative to the mobile phone (i.e., the direct airflow position of the heat-generating surface of the back cover, i.e., the heat dissipation position). Thus, the user can rotate the rotating part to further achieve selective heat dissipation of the heat-generating surface of the back cover.

[0015] Alternatively, the mounting unit can be externally mounted on the phone in a non-removable manner, such as on the back cover of the phone battery. In this case, the user can still adjust the airflow position of the first jet piezoelectric fan by operating the rotating part, thereby achieving selective heat dissipation.

[0016] On the other hand, the first jet piezoelectric fan in the heat dissipation module has a jet port for fluid (e.g., airflow) to enter and exit at the same time. That is to say, in the embodiments of this application, the jet port of the first jet piezoelectric fan can be used as both an air inlet (i.e., a jet port when air is entering) and an air outlet (i.e., a jet port when air is exiting). In other words, the air inlet and air outlet of the first jet piezoelectric fan are located on the same side, thereby effectively improving the heat dissipation capacity.

[0017] Specifically, the jet nozzle is used for both air intake and exhaust, without causing separation between the air intake and exhaust ports. Therefore, firstly, the structural design of the first jet piezoelectric fan can be made more compact, reducing its thickness and facilitating a thinner and lighter design. For example, the thickness of the first jet piezoelectric fan in this embodiment is less than or equal to 2mm, making it lightweight and not affecting the grip of the mobile phone.

[0018] Secondly, the airflow does not travel a long distance or undergo multiple turns within the first jet piezoelectric fan, resulting in minimal airflow loss, a large air volume, and low impedance. This effectively removes heat from the phone, improving heat dissipation efficiency. The principle behind this effect achieved by the first jet piezoelectric fan will be explained in detail later with reference to the accompanying drawings.

[0019] On the other hand, compared with traditional fan cooling, the cooling module provided in this application combines the mounting part and the first jet piezoelectric fan. The mounting part achieves the effect of placing the entire cooling module on the outside of the mobile phone without occupying internal space, while the use of the first jet piezoelectric fan further improves the cooling capacity of the cooling module. Therefore, the cooling module in this application achieves the effect of "1+1>2".

[0020] Furthermore, the heat dissipation module of this application embodiment can also be applied to foldable phones. The screen of a foldable phone occupies a larger space, which, compared to a candybar phone, further restricts its heat dissipation design. Secondly, the screen of a foldable phone has superior lighting effects (such as brightness, contrast, and color saturation), which generate more heat. The heat dissipation module of this application embodiment can be externally mounted on the foldable phone, thereby decoupling the foldable phone's heat dissipation solution from screen reliability and lighting, resulting in a significant improvement in the visible appearance of the foldable screen, such as creases and uneven lighting.

[0021] In summary, the heat dissipation module provided in this application embodiment can be externally mounted on the mobile phone without occupying the internal space of the phone, effectively avoiding conflicts with the thin and light design of the phone. Furthermore, the heat dissipation module has excellent heat dissipation capabilities, for example, it can reduce the temperature by 2℃ to 10℃, and the heat dissipation capacity is increased to, for example, 70mA / ℃ to 200mA / ℃, and it can selectively dissipate heat from the mobile phone.

[0022] In some possible implementations of the first aspect mentioned above, the heat dissipation module further includes an operating component. The rotating part includes a first end and a second end. The first end is rotatably connected to the mounting part, and the second end is rotatably connected to the operating component. The operating component is used for user operation to switch the rotating part between an open state and a folded state. In the folded state, the rotating part and the mounting part are fitted together or spaced apart. In the open state, the rotating part and the mounting part are angled together.

[0023] In some possible implementations of the first aspect described above, the rotating part includes a first recess, the operating member includes a second recess, and in the folded state, the first recess and the second recess are in contact.

[0024] By adopting the above technical solution, the first recess of the rotating part and the second recess of the operating part can fit together in the folded state, making the structure of the heat dissipation module compact in the folded state, which is conducive to the lightweight and thin design of the heat dissipation module.

[0025] In some possible implementations of the first aspect described above, the operating element includes an arcuate segment that, in a folded state, surrounds the first jet piezoelectric fan.

[0026] In some possible implementations of the first aspect mentioned above, the mounting part has a magnetic element for attaching to the back cover of the mobile terminal.

[0027] In some possible implementations of the first aspect mentioned above, the mounting part includes a connector, the connector is provided with a leg for attaching a mobile terminal, and the connector is rotatably connected to the rotating part.

[0028] In some possible implementations of the first aspect described above, the mounting portion includes a through-hole for exposing the back cover of the mobile terminal to form a flow channel.

[0029] Using the above technical solution, after the mounting part is installed on the mobile phone, the through hole of the mounting part can define a flow channel with the heating surface of the mobile phone. When the first jet pneumatic fan runs, the high-speed jet blown out can be directly sprayed onto the heating surface of the mobile phone. During the flow through the flow channel, it directly exchanges heat with the heating surface of the mobile phone, and the flow channel can guide the high-speed jet, improving the heat dissipation efficiency. At the same time, the flow channel's guidance of airflow can also make the heat dissipation of the heating surface more uniform.

[0030] In some possible implementations of the first aspect described above, the first jet piezoelectric fan is rotatably connected to the rotating part.

[0031] In some possible implementations of the first aspect described above, the first jet piezoelectric fan includes a plurality of first jet piezoelectric fans, which are spaced apart on the rotating part.

[0032] In some possible implementations of the first aspect mentioned above, the thickness of the first jet piezoelectric fan is less than or equal to 2 mm.

[0033] Using the above technical solution, the first jet piezoelectric fan provided in this application embodiment is thinner and lighter, and does not affect the grip feel of the mobile phone.

[0034] In some possible implementations of the first aspect mentioned above, the heat dissipation module further includes an additional heat dissipation unit, on which a second jet piezoelectric fan is provided. The additional heat dissipation unit and the rotating part are located on opposite sides of the mounting part, and the second jet piezoelectric fan is used to face the screen of the mobile terminal.

[0035] By adopting the above technical solution, an additional heat dissipation part with a second jet piezoelectric fan installed on the opposite side of the rotating part (i.e., the side of the mobile phone screen) can effectively dissipate heat from the screen.

[0036] The second aspect of this application provides an electronic device, including: a mobile terminal and any one of the heat dissipation modules of the first aspect and its possible implementations, wherein the mobile terminal has a heat-generating surface, and the jet port of the first jet piezoelectric fan of the heat dissipation module is directed toward the heat-generating surface of the mobile terminal, thereby dissipating heat from the heat-generating surface of the mobile terminal.

[0037] By adopting the above technical solution, the electronic device of this application embodiment can provide users with a better user experience. On the one hand, since an external heat dissipation module is used to dissipate heat from the mobile terminal (e.g., a mobile phone), the mobile phone can achieve a thin and light design and production, providing users with a comfortable grip experience, easy portability, and a slim and exquisite aesthetic. On the other hand, the heat dissipation module has excellent heat dissipation capabilities, so the mobile phone will not generate serious heat, and will not affect the user's grip, further improving the user's grip experience. Furthermore, users can selectively install the heat dissipation module in the desired installation position, or they can selectively adjust the airflow position of the first jet piezoelectric fan in the heat dissipation module relative to the mobile phone, thus the heat dissipation solution is quite flexible.

[0038] In some possible implementations of the second aspect mentioned above, the mobile terminal includes a heat-generating surface, and in the open state of the heat dissipation module, the distance between the jet outlet of the first jet piezoelectric fan and the heat-generating surface is greater than or equal to 2 mm.

[0039] By adopting the above technical solution, the jet outlet of the first jet piezoelectric fan can be adjusted to a position greater than or equal to 2mm from the heat-generating surface of the mobile phone via the rotating part. For example, the distance can be 2mm, 2.5mm, 3mm, 5mm, 8mm, 10mm, 15mm, etc. Within this distance range, the airflow is less obstructed and is more conducive to the free diffusion and flow of the airflow generated by the first jet piezoelectric fan. The working environment of the first jet piezoelectric fan is closer to a low-resistance free field, which is conducive to improving the heat dissipation efficiency of the first jet piezoelectric fan and enabling it to perform its heat dissipation capacity at a high performance.

[0040] In some possible implementations of the second aspect above, the mobile terminal includes a mobile phone, the mobile phone includes a back cover, the back cover includes a heat-generating surface, and a heat dissipation module is mounted on the heat-generating surface of the back cover.

[0041] In some possible implementations of the second aspect above, the mobile terminal includes a mobile phone, the mobile phone includes a screen and a mid-frame, the screen includes a heat-generating surface, and an additional heat dissipation part of the heat dissipation module is mounted on the mid-frame and faces the screen.

[0042] In some possible implementations of the second aspect mentioned above, the mobile terminal includes a smartwatch, which includes a dial and a connection part. One end of the dial is rotatably connected to the connection part. The dial includes a heating surface, and a heat dissipation module is mounted on the connection part.

[0043] A third aspect of this application provides a mobile terminal, comprising: a back cover having a heating surface; a rotating part rotatably connected to the back cover; and a jet piezoelectric fan disposed on the rotating part, the jet piezoelectric fan including a jet port disposed toward the heating surface of the back cover, the jet port being used for fluid inlet / outlet.

[0044] Using the above technical solution, when a user needs heat dissipation while using a mobile terminal (such as a mobile phone), they can rotate the rotating part to direct the jet piezoelectric fan located on the rotating part towards the back cover, thereby achieving effective heat dissipation. Furthermore, the jet outlet of this jet piezoelectric fan serves as both an air inlet and an air outlet. This design, where the air inlet and outlet are not separated, reduces airflow loss and improves the heat dissipation capacity of the jet piezoelectric fan.

[0045] In some possible implementations of the third aspect mentioned above, the back cover includes a heating surface, and when the rotating part is in the open state, the distance between the jet nozzle of the jet piezoelectric fan and the heating surface is greater than or equal to 2 mm.

[0046] A fourth aspect of this application provides a mobile terminal, comprising: a watch strap with a connecting portion; a watch face with a heating surface, one end of which is rotatably connected to the connecting portion; a rotating portion rotatably connected to the connecting portion; and a jet piezoelectric fan mounted on the rotating portion, the jet piezoelectric fan including a jet port facing the heating surface of the watch face, the jet port being used for fluid inlet / outlet.

[0047] Using the above technical solution, the watch face of the mobile terminal provided in the fourth aspect of this application is similar to that of a mobile phone, having a heating surface. The connecting part on the watch strap is equivalent to the heat dissipation back clip (i.e., mounting part) of a mobile phone. In other words, a rotating part equipped with a jet piezoelectric fan can be directly mounted on the connecting part, and the rotating part can rotate relative to the watch face. The jet piezoelectric fan on the rotating part can blow air towards the heating surface of the watch face. From a positional perspective, the watch strap and connecting part, the rotating part, and the jet piezoelectric fan are relatively independent of the watch face.

[0048] The fifth aspect of this application provides a mobile terminal, including: a watch strap with a connecting portion; a watch face with a heating surface, one end of which is rotatably connected to the connecting portion; and a jet piezoelectric fan mounted on the connecting portion, the jet piezoelectric fan including a jet port facing the heating surface of the watch face, the jet port being used for fluid inlet / outlet.

[0049] Using the above technical solution, the watch face of the mobile terminal provided in the fifth aspect of this application is similar to that of a mobile phone, having a heating surface. The connecting part on the watch strap is equivalent to the heat dissipation back clip (i.e., mounting part) of a mobile phone. In other words, a jet piezoelectric fan can be directly mounted on the connecting part, and the jet piezoelectric fan can blow air towards the heating surface of the watch face. In the application of the mobile terminal provided in the fifth aspect of this application, although a rotating part is not provided, the connecting part and the jet piezoelectric fan can rotate relative to the watch face. From a positional perspective, the watch strap, connecting part, and jet piezoelectric fan are relatively independent of the watch face. Attached Figure Description

[0050] Figure 1A A schematic diagram of the application of the heat dissipation module provided in this application embodiment is shown;

[0051] Figure 1B A second schematic diagram illustrating the application of the heat dissipation module provided in this application embodiment is shown.

[0052] Figure 2A This paper illustrates the application of the heat dissipation module provided in an embodiment of this application in diagram three.

[0053] Figure 2B A schematic diagram of the installation position of the heat dissipation module provided in an embodiment of this application is shown;

[0054] Figure 2C A second schematic diagram showing the installation position of the heat dissipation module provided in an embodiment of this application is shown.

[0055] Figure 2D This paper shows a schematic diagram of the installation position of the heat dissipation module provided in an embodiment of this application;

[0056] Figure 2E This application shows a schematic diagram of the installation position of the heat dissipation module provided in an embodiment. Figure 4 ;

[0057] Figure 3A A schematic diagram of the first jet piezoelectric fan in an embodiment of this application is shown;

[0058] Figure 3B A schematic diagram of a synthetic jet piezoelectric fan in some embodiments of this application is shown;

[0059] Figure 4A thermal performance curve of the heat dissipation module provided in an embodiment of this application is shown in Figure 1.

[0060] Figure 5 A perspective view of the heat dissipation module provided in an embodiment of this application is shown;

[0061] Figure 6 A second perspective view of the heat dissipation module provided in an embodiment of this application is shown;

[0062] Figure 7 A perspective view of the heat dissipation module provided in an embodiment of this application is shown in Figure 3.

[0063] Figure 8 A schematic diagram of the heat dissipation module provided in an embodiment of this application is shown;

[0064] Figure 9 A partially enlarged view of the heat dissipation module provided in an embodiment of this application is shown;

[0065] Figure 10 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 4 ;

[0066] Figure 11 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 5 ;

[0067] Figure 12 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 6 ;

[0068] Figure 13 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 7 ;

[0069] Figure 14 A three-dimensional view of the heat dissipation module provided in the embodiment of this application is shown. Figure 4 ;

[0070] Figure 15 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 8 ;

[0071] Figure 16 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 9 ;

[0072] Figure 17 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 ;

[0073] Figure 18 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 one;

[0074] Figure 19 Figure 2 shows the thermal performance curve of the heat dissipation module provided in the embodiment of this application;

[0075] Figure 20 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 two;

[0076] Figure 21 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 three;

[0077] Figure 22 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 Four;

[0078] Figure 23 This illustration shows a schematic diagram of the principle of power supply for the heat dissipation module provided in an embodiment of this application;

[0079] Figure 24 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 five;

[0080] Figure 25 This application illustrates the application of the heat dissipation module provided in the embodiments of this application. Figure 10 six. Detailed Implementation

[0081] refer to Figure 1A and Figure 1B This application provides an electronic device 100 with an external heat dissipation system. The electronic device 100 includes a heat dissipation module 200 and a mobile terminal (e.g., a mobile phone 300 as described below). The heat dissipation module 200 is externally mounted on the mobile phone 300 as an independent accessory, making it very convenient for independent cleaning, replacement, and repair. It can be understood that the heat dissipation module 200 provided in this application is a component or system with heat dissipation function. Meanwhile, as... Figure 1A and Figure 1B As shown, the heat dissipation module 200 of this application embodiment can be applied to mobile terminals of different types, models and sizes.

[0082] Specifically, the mobile terminals in this application include, but are not limited to, mobile phones, foldable phones, tablet personal computers, e-book readers, laptop computers, personal computers (PCs), personal digital assistants (PDAs), notebooks, in-vehicle devices, wearable devices (such as smartwatches), boxes, and other electronic devices that require heat dissipation.

[0083] For ease of explanation, the following explanation uses the mobile terminal, the 300 mobile phone, as an example.

[0084] With the development of technology, the various functions of mobile phones have been significantly expanded and improved. At the same time, mobile phones are also becoming thinner and lighter, and heat dissipation design has gradually become a bottleneck for the performance of mobile phones.

[0085] For example, due to the development of artificial intelligence (AI), some mobile phones (such as the mobile phone 300 provided in the embodiments of this application) have introduced large-scale AI models to generate various image and photography optimization processing, voice assistant execution or conversion, user interface interaction experience and other functions. During the operation of these functions, a lot of computing resources are required, which will generate a lot of heat.

[0086] For example, with the widespread adoption of satellite communication technology, some mobile phones (such as the mobile phone 300 provided in this embodiment) can directly send and receive signals via satellite networks without relying on terrestrial cellular networks. This allows them to maintain communication capabilities even during periods without network coverage (e.g., natural disasters, emergencies) and in areas (e.g., remote areas, deep mountains, jungles, oceans). Compared to traditional terrestrial cellular network communication, satellite communication requires covering greater distances and stronger signal penetration. Therefore, when using satellite communication with mobile phone 300, power consumption increases, generating more heat.

[0087] However, with the trend of making mobile phones thinner and lighter, they cannot provide enough space for traditional heat dissipation methods from the initial design stage, which greatly affects the heat dissipation capacity of traditional heat dissipation methods. Traditional heat dissipation methods are also not well adapted to intelligent and high-performance mobile phones with functions such as artificial intelligence and satellite communication.

[0088] Specifically, traditional heat dissipation methods for mobile phones typically include: phase change heat dissipation, heat dissipation materials, and forced heat dissipation.

[0089] Given the limited internal space of a mobile phone, the heat dissipation capacity of phase change heat dissipation and heat dissipation materials is reduced. For example, the size and length of the heat pipe in phase change heat dissipation are reduced, and the capillary structure inside the heat pipe to promote liquid circulation is simplified. The thickness of the vapor chamber (VC) in phase change heat dissipation is reduced. Furthermore, the thickness of graphite sheets and thermal interface materials (TIM) in heat dissipation materials is reduced, resulting in a decrease in the amount of material used.

[0090] Similarly, although forced cooling fan cooling uses active air cooling, its equivalent heat transfer coefficient can be several times that of the aforementioned phase change cooling and heat dissipation materials, improving heat dissipation capacity by more than 50%. However, this type of fan still occupies internal space in the phone, and additional air inlets and outlets and dust filters need to be installed on the phone's casing.

[0091] Furthermore, the phone 300 is prone to drops, squeezing, or collisions during use and carrying, making the fan susceptible to significant localized impact and deformation. Over time, dust and fibrous grime accumulate in the fan, affecting its performance and causing noise and other issues. Moreover, the fan module is costly to maintain and repair. If a problem occurs, the phone 300 needs to be disassembled. For phones with high sealing ratings, disassembling and repairing the internal fan is difficult and carries a high risk of damage (e.g., scratching the side buttons, display, battery, internal components, etc. during disassembly). Therefore, the effectiveness of this type of fan-based heat dissipation is limited by both fan reliability and the phone's overall safety.

[0092] To solve the above technical problems, refer to Figure 1A and Figure 1B The heat dissipation module 200 provided in this application embodiment can be externally placed on the mobile phone 300 without occupying the internal space of the mobile phone 300. At the same time, the heat dissipation module 200 adopts jet piezoelectric fans (such as the first jet piezoelectric fan and the second jet piezoelectric fan described below) to effectively dissipate heat from the mobile phone 300, and has better heat dissipation capacity, and is easy to maintain and highly reliable.

[0093] Furthermore, the heat dissipation module 200 of this application embodiment can also be applied to foldable phones (not shown in the figure). Since the screen of a foldable phone occupies a larger space, it further restricts its heat dissipation design compared to a regular phone 300. On the other hand, the screen of a foldable phone has superior lighting effects (such as brightness, contrast, and color saturation), which generate more heat. The heat dissipation module 200 of this application embodiment can be externally mounted on the foldable phone, thereby decoupling the foldable phone's heat dissipation solution from screen reliability and lighting conditions. This significantly improves the visible appearance of the foldable screen, such as creases and uneven lighting.

[0094] For ease of subsequent description, before describing the specific structures of the heat dissipation module 200 and the mobile phone 300, this application embodiment first exemplarily defines the X direction, Y direction, Z direction, and T direction. For example... Figure 1A and Figure 1B As shown, the X direction is the width direction of the phone 300 when it is normally placed, which can also be understood as the width direction of the heat dissipation module 200, and also as the direction perpendicular to the user's grip direction. The Y direction is the length direction (i.e., horizontal) of the phone 300 when it is normally placed, which can also be understood as the length direction of the heat dissipation module 200, and also as the user's grip direction when using the phone 300. The Z direction is the thickness direction of the phone 300 when it is normally placed, which can also be understood as the thickness direction of the heat dissipation module 200. The T direction is the direction through which the heat dissipation module 200 passes via a hinge (such as the first hinge or the second hinge 2112 described later, as shown below). Figure 5 or Figure 10 (As shown) In relation to the rotation direction of the mobile phone 300, the extension direction of the axis of the rotating shaft is parallel to or intersects the X direction, or the extension direction of the axis of the rotating shaft is parallel to or intersects the Y direction.

[0095] In this embodiment, the X, Y, and Z directions intersect each other. The following explanation will use the example of the X, Y, and Z directions being mutually perpendicular to each other. It should be noted that the perpendicularity in this embodiment is not absolute; approximate perpendicularity due to manufacturing and assembly errors (e.g., an angle of 89.9° between two structural features) is also within the scope of perpendicularity in this embodiment. The limitations on perpendicularity will not be repeated later.

[0096] Continue to refer to Figure 1A and Figure 1B , Figure 1A This paper shows an application diagram of the heat dissipation module 200 according to an embodiment of this application. Figure 1B The second illustration shows an application diagram of the heat dissipation module 200 according to an embodiment of this application.

[0097] In this embodiment of the application, the mobile phone 300 includes a mid-frame, a back cover 310, and a screen. The mid-frame is the basic skeleton of the mobile phone 300, and the back cover 310 and the screen are respectively disposed on opposite sides of the mid-frame.

[0098] The back cover 310 is used to protect the internal components inside the phone 300, and the internal components are adjacent to the back cover 310. For example, when the phone 300 uses functions such as satellite communication, camera function, image processing or scene recognition through artificial intelligence (AI), or playing games, the internal components will generate a lot of heat. Since the thermal conductivity of the back cover 310 is usually higher than that of the screen, the heat generated by the internal components will be transferred to the back cover 310. Therefore, the back cover 310 is a heat-generating surface of the phone 300. In other words, by heat dissipation treatment of the back cover 310, the temperature of the internal components inside the back cover 310 can be effectively reduced.

[0099] Specifically, the internal components include, but are not limited to: motherboard, battery, antenna, vibration motor, etc. The motherboard integrates chips such as processor, memory, storage, satellite communication module, fingerprint recognition module (e.g., short-focus fingerprint sensor), etc. The battery can be a high-capacity battery (e.g., 5300mAh), and the vibration motor is connected to the interface on the motherboard via wires.

[0100] For example, when using the satellite communication function of mobile phone 300, at least some components within the internal system work together, generating significant heat. For instance, the satellite communication module allows mobile phone 300 to communicate with satellite signals, the antenna receives and transmits satellite signals, the processor processes satellite signal data and runs satellite communication algorithms, and the memory chip stores data related to satellite communication. During this collaborative operation, the internal components consume a lot of power, causing the back cover 310 to overheat and affecting the user's grip experience.

[0101] It can also be seen that the back cover 310 also includes a lens module 320. For example, when using the camera function for a long time or using artificial intelligence (AI) functions for operations such as scene recognition and image processing, the lens module 320 in the back cover 310 will also generate high heat.

[0102] Therefore, continue to refer to Figure 1A and Figure 1B In this embodiment of the application, the heat dissipation module 200 is disposed on the rear cover 310 for effectively cooling the rear cover 310.

[0103] Furthermore, it should be noted that since heat transfer is multidirectional, when the aforementioned functions of the mobile phone 300 are running, some heat is also transferred to the mid-frame (including the bezel) and the screen. For example, when the mid-frame is a metal mid-frame, some of the heat generated by the internal components may be transferred to the screen through the metal mid-frame. Therefore, the screen is also a heat-generating surface of the mobile phone 300. Additionally, for example, when the screen uses an OLED (Organic Light-Emitting Diode) screen, its own light emission generates a certain amount of heat. Therefore, the heat dissipation module 200 of this application embodiment can also effectively dissipate heat from the screen and the mid-frame (including the bezel), which will be described in detail in the embodiments below.

[0104] The heat dissipation module 200 of this application is described below with reference to the accompanying drawings and specific embodiments.

[0105] Example 1

[0106] refer to Figure 2A and combined Figure 1A and Figure 1B , Figure 2A A schematic diagram (3) illustrating the application of the heat dissipation module 200 according to an embodiment of this application is shown. Wherein, Figure 1A and Figure 1B The heat dissipation module 200 on the mobile phone 300 is shown in a folded state, as an example. Figure 2A An example is shown where the heat dissipation module 200 on the mobile phone 300 is in the open state.

[0107] As can be seen, the heat dissipation module 200 in this embodiment includes: a mounting part 210, a rotating part 220, and a first jet piezoelectric fan 230.

[0108] First, it should be noted that this section will focus on the structure and arrangement of the mounting part 210, the rotating part 220, and the first jet piezoelectric fan 230. The basic principle and power supply method of the first jet piezoelectric fan 230 will be explained later.

[0109] like Figure 2A As shown, the mounting part 210 is mounted on the back cover 310 of the mobile phone 300. The mounting part 210 can also be referred to as a heat dissipation back clip. Alternatively, it can be understood that the mounting part 210 is mounted to the heat-generating surface of the back cover 310. In this embodiment, the mounting part 210 is magnetically connected to the back cover 310, allowing the user to easily remove and install the mounting part 210 for cleaning, maintenance, or replacement of the heat dissipation module (e.g., for cleaning, maintenance, or replacement of the aforementioned first jet piezoelectric fan 230).

[0110] However, this application embodiment does not impose specific limitations on the connection method between the mounting part 210 and the mobile phone 300. For example, detachable connection methods such as snap-fit, bracket, and detachable adhesive (using adhesive products with reusable bonding functions such as Velcro, gel adhesive, and removable double-sided tape) can be used. For example, non-detachable connection methods such as adhesive products can also be used.

[0111] For example, the mounting part 210 can also be part of the back cover 310. In this case, the rotating part 220 is rotatably connected to the back cover 310. This can be understood as directly setting the rotating part 220 on the back cover 310, rotatably connecting the rotating part 220 to the back cover 310, and then setting a jet piezoelectric fan on the rotating part 220. It should be noted that the structure of this jet piezoelectric fan, its distance from the heating surface of the back cover 310, and its operating principle are the same as the first jet piezoelectric fan 230 (which will be explained in detail later). In other words, the jet piezoelectric fan is set on the rotating part 220, omitting the aforementioned mounting part 210. It can also be understood that the back cover 310 comes with the rotating part 220 and the jet piezoelectric fan when the mobile terminal leaves the factory.

[0112] Furthermore, this application embodiment does not impose specific restrictions on the material of the mounting part 210; for example, insulating materials can be used.

[0113] Therefore, the mounting part 210 can be installed on the mobile phone 300 by the user. Thus, the heat dissipation module 200, as an external accessory of the mobile phone 300, does not occupy the internal space of the mobile phone 300 and will not conflict with the slim design and production of the mobile phone 300. In addition, by way of example, when the mounting part 210 is installed by a detachable connection method (e.g., magnetic or detachable adhesive), the user can adjust the installation position of the mounting part 210 himself.

[0114] For example, such as Figures 2B to 2E As shown, Figures 2B to 2E The diagrams illustrating different mounting positions of the heat dissipation module 200 are shown respectively, demonstrating that... Figure 2B In the middle, the mounting part of the heat dissipation module 200 is installed at the bottom end of the rear cover 310 (i.e., Figure 2B (the end pointed to in the Y2 direction), in Figure 2C In the middle, the mounting part of the heat dissipation module 200 is installed on the side of the rear cover 310 (e.g., Figure 2C The left side shown is... Figure 2C (the end pointed to in the X1 direction), in Figure 2D In the middle, the mounting part of the heat dissipation module 200 is installed on the other side of the rear cover 310 (e.g., Figure 2D The right side shown is... Figure 2D (the end pointed to in the X2 direction), in Figure 2EIn the middle, the mounting part of the heat dissipation module 200 is installed on the end of the rear cover 310 near the lens module 320 (i.e., Figure 2E (The end pointed to by the Y1 direction).

[0115] In other words, in this embodiment of the application, the user can install the mounting part 210 at any position on the back cover 310, as long as it can dissipate heat from the back cover 310, it is considered a mounting position of the mounting part 210.

[0116] refer to Figure 2A and combined Figure 1A and Figure 1B Furthermore, the rotating part 220 is rotatably connected to the mounting part 210, and a first jet piezoelectric fan 230 is mounted on the rotating part 220. The first jet piezoelectric fan 230 includes three jet ports 231.

[0117] For ease of description, the following text will... Figure 2A The area indicated by the dashed box is designated as the first heat-generating surface 311 of the back cover 310 (i.e., the heat-generating surface of the back cover 310 located between the heat dissipation module 200 and the lens module 320 is the first heat-generating surface 311), and the area of ​​the lens module 320 within the back cover 310 is designated as the second heat-generating surface 312 of the back cover 310. It is understood that the back cover 310 may also include other heat-generating surfaces; this definition is provided for ease of description only and is not intended to be restrictive.

[0118] like Figure 1A and Figure 1B As shown, the heat dissipation module 200 is in a folded state at this time, that is, the rotating part 220 and the mounting part 210 are either in contact or spaced apart. In this folded state, along the second direction (e.g. Figure 1A and Figure 1B (shown in the Z direction), the three jet ports 231 of the first jet piezoelectric fan 230 (as shown in the figure) Figure 2A As shown) Oriented toward the mounting part 210 (i.e. Figure 1A and Figure 1B (The side indicated by the Z2 direction). It can also be understood that, in the folded state, the three jet ports 231 are positioned toward the heating surface (e.g., the first heating surface 311) of the rear cover 310.

[0119] like Figure 1B and Figure 2A As shown, when heat dissipation is needed for the back cover 310 (e.g., the first heat-generating surface 311), the user can rotate the rotating part 220 so that the rotating part 220 is relative to the mobile phone 300 along a first direction (e.g., Figure 1B (as shown in the T direction) and away from the first heating surface 311 (e.g., the direction of T shown in the diagram) and the direction away from the first heating surface 311. Figure 1B Rotate in the direction of T2 (as shown in the diagram), thereby rotating to the position shown in the diagram. Figure 2AThe diagram shows the open state, in which the three jet ports 231 of the first jet piezoelectric fan 230 face the first heating surface 311. Alternatively, the rotating part 220 can be rotated to the open state so that the three jet ports 231 of the first jet piezoelectric fan 230 face the second heating surface 312.

[0120] In other words, the rotating part 220 can rotate relative to the rear cover 310 to adjust the angle between the rotating part 220 and the heating surface of the rear cover 310 (which can also be understood as the angle between the first jet piezoelectric fan 230 and the heating surface of the rear cover 310), that is, to adjust the orientation of the jet port 231, so as to selectively dissipate heat from the heating surface of the rear cover 310 (e.g., the first heating surface 311, the second heating surface 312), thereby effectively cooling the internal components (e.g., the motherboard integrating various chips, the satellite communication module, etc.) corresponding to the heating surface.

[0121] like Figure 2A As shown, it can be seen that in Figure 2A In the open state shown, the rotating part 220 and the heating surface of the rear cover 310 are set at an angle α. This application embodiment does not limit the value of angle α; as long as the included angle α is taken from any angle within the range of (0°, 90°), it falls within the protection scope of this application embodiment. For example, the included angle α is 15°, 17.8°, 45°, 89°, 89.9°, 90°, etc.

[0122] It should be noted that the aforementioned angle α can also be understood as the angle between the surface where the jet port 231 is located and the heating surface of the rear cover 310. This application embodiment does not limit this.

[0123] It should be further noted that the number of the first jet piezoelectric fans 230 described above is not limited in the embodiments of this application. For example, one, two, three or other numbers of first jet piezoelectric fans 230 can be set.

[0124] Meanwhile, this application does not limit the type of the first jet piezoelectric fan 230. For example, the first jet piezoelectric fan 230 can be a type of jet piezoelectric fan such as a synthetic jet piezoelectric fan. A synthetic jet is characterized by outputting only momentum with zero mass, hence it is also called a zero-mass jet. Compared with traditional continuous blowing or suction flow control technologies, synthetic jets have many advantages such as simple and compact structure, light weight, low cost, convenient maintenance, and no need for an additional air source.

[0125] Furthermore, this application embodiment does not impose specific limitations on the number or shape of the jet ports 231 of the first jet piezoelectric fan 230. For example, the first jet piezoelectric fan 230 may be provided with one, two, four, six, or other jet ports 231. For another example, the jet ports 231 may be circular, elliptical, triangular, rectangular, trapezoidal, or other shapes. As long as the jet ports 231 can enable the flow of fluid, they are all within the protection scope of this application embodiment.

[0126] Continue to refer to Figure 2A and combined Figure 1A and Figure 1B Furthermore, in this embodiment of the application, each jet port 231 of the first jet piezoelectric fan 230 is used to allow external fluid (e.g., airflow) to enter, and simultaneously, each jet port 231 is also used to allow airflow inside the first jet piezoelectric fan 230 to exit. That is, the jet port 231 of the first jet piezoelectric fan 230 used in this embodiment of the application is used for both airflow inlet and outlet; in other words, the air inlet and outlet positions of the first jet piezoelectric fan 230 are located on the same side (both air inlet and outlet positions are achieved by the same jet port 231).

[0127] Specifically, refer to Figure 3A , Figure 3A An exemplary schematic diagram of the jet principle of the first jet piezoelectric fan 230 according to an embodiment of this application is shown, wherein, Figure 3A Only one jet port 231 is shown, but it is not limited to this.

[0128] The first jet piezoelectric fan 230 of this application embodiment is a synthetic jet fan that generates airflow using the principle of a synthetic jet exciter 2300. The synthetic jet exciter 2300 is a device capable of generating a synthetic jet. Figure 3A The example shown is a schematic diagram of the synthetic jet exciter 2300 in the first jet piezoelectric fan 230.

[0129] like Figure 3A As shown, the synthetic jet exciter 2300 of the first jet piezoelectric fan 230 includes: a piezoelectric vibrator 232 and a cavity 233. It can be seen that the cavity 233 has a jet port 231, which is used to allow external airflow to enter (e.g., ...). Figure 3A(As indicated by the arrows on both sides of the jet port 231), and is used to blow out the internal airflow. Specifically, during operation, the piezoelectric vibrator 232 generates high-frequency vibration, which changes the volume of the cavity 233. During the intake process, the volume of the cavity 233 increases, and a large amount of air enters from the jet port 231; during the pumping process, the volume of the cavity 233 decreases, and a large amount of air is ejected from the cavity 233 through the jet port 231. This causes the cavity 233 connected to the piezoelectric vibrator 232 to alternately blow and suck the airflow at the jet port 231. The airflow blown out from the jet port 231 forms a vortex ring due to shearing action and is discharged from the jet port 231 in the form of a high-speed jet. Compared with traditional continuous blowing or intake fluid control technology, synthetic jet has many advantages such as simple and compact structure, low cost, convenient maintenance, light weight, no need for additional metal heat sink fins for heat dissipation, and no need for an additional air source.

[0130] In other words, the structure of the synthetic jet exciter mainly consists of two parts: an exciter cavity (i.e., cavity 233) with an opening (or slit) (i.e., jet port 231) and a driving component (i.e., a piezoelectric vibrator 232, an energy or vibration component, which includes a piezoelectric oscillator 2322 and a piezoelectric ceramic plate 2321). The driving component is the core component of the exciter, which converts the input electrical energy or other forms of energy into the energy of the driving component, and then into the kinetic energy of the synthetic jet through the exciter cavity. The synthetic jet exciter only requires electrical energy to operate, and it is easy to control electrical parameters (voltage amplitude, frequency, phase); its structure is extremely simple, with a thickness ≤1mm and a weight ≤1g, meeting the ultra-thin and lightweight requirements of mobile terminal products; it can operate in the ultrasonic frequency band (≥20KHz) that is inaudible to the human ear, meeting the low noise requirement.

[0131] Continue to refer to Figure 3A It is understood that the first jet piezoelectric fan 230 used in the embodiments of this application is a zero-mass "synthetic" jet piezoelectric pump. The structure blown out from the jet port 231 is a series of unsteady vortex rings 234 (or vortex pairs) that continuously expand outward. This series of unsteady vortex rings 234 (or vortex pairs) is generated by the periodic vibration of the diaphragm of the synthetic jet exciter 2300, which causes the ambient fluid to be periodically sheared and separated at the outlet orifice of the exciter and ejected outward.

[0132] When the synthetic jet exciter 2300 starts working, the piezoelectric ceramic plate 2321 in the piezoelectric vibrator 232 undergoes the inverse piezoelectric effect under the action of a periodically changing voltage signal. The piezoelectric oscillator 2322 on the bottom surface of the cavity 233 then generates periodic vibration. When the piezoelectric oscillator 2322 moves along... Figure 3A The O direction (i.e., along the thickness direction of the synthetic jet exciter 2300 and towards the piezoelectric vibrator 2322) vibrates downwards (or is called negative vibration, such as...). Figure 3AWhen the direction of O2 is shown in the figure, the gas pressure inside the cavity 233 decreases, and the gas near the external jet port 231 (or jet slit) enters the cavity 233 through the jet port 231 (or jet slit).

[0133] When the piezoelectric vibrator 2322 along Figure 3A The upward vibration (or positive vibration, such as) occurs in the O direction (i.e., along the thickness direction of the synthetic jet exciter 2300 and towards the piezoelectric vibrator 2322). Figure 3A When the direction shown is O1, the gas inside the cavity 233 is compressed and will be discharged from the cavity 233 through the jet port 231 (or jet slit).

[0134] During the alternating blowing and suction process of the gas, the airflow near the jet port 231 (or jet slit) is subjected to strong shearing, resulting in flow separation at the outlet edge of the jet port 231 (the flow direction changes from entering the cavity 233 from the body to flowing towards the environment), and then the discharged fluid rolls up to form a vortex ring 234 (or vortex pair).

[0135] When the next intake process begins, the vortex rings 234 (or vortex pairs) formed by the previous blowing process and moving downstream have moved away from the vicinity of the jet port 231 and are not affected by the intake. In this continuous blowing / inhalation alternation process, the gas forms a series of vortex rings 234 (or vortex pairs) that migrate downstream.

[0136] This series of vortex rings 234 (or vortex pairs) will undergo instability and breakup processes as they move downstream, eventually forming a stable turbulent or laminar jet downstream of the outlet.

[0137] It should be further explained that the piezoelectric effect described above reflects the coupling relationship between the elastic and dielectric properties of a crystal. When certain dielectric crystals deform under external force, opposite polarized charges appear on some of their surfaces. This phenomenon of polarization within the crystal, caused solely by strain or stress without the influence of an electric field, is called the direct piezoelectric effect or piezoelectric effect. In other words, when pressure (or strain) is applied to a piezoelectric material to induce mechanical deformation, the piezoelectric material will generate induced charges or voltages on the polarized surfaces. This property of the crystal is called piezoelectricity. When a voltage is applied to a piezoelectric material, mechanical force or strain is generated, i.e., the inverse piezoelectric effect. Applying an alternating electric field to a piezoelectric crystal can excite elastic waves of various vibration modes within the piezoelectric crystal through the inverse piezoelectric effect. When the frequency of the external electric field matches the natural frequency of the elastic wave propagating within the piezoelectric body, the piezoelectric body enters a mechanical resonance state, called a mechanically resonant piezoelectric vibrator.

[0138] Therefore, the embodiments of this application do not cause the air inlet and air outlet to separate. The airflow goes straight in and out through the jet port 231 and does not experience a long distance and turns inside the first jet piezoelectric fan 230. The airflow loss is small, the air volume is large, and the impedance is low, thereby effectively removing heat from the mobile phone and improving heat dissipation efficiency.

[0139] Accordingly, the above-mentioned design, with air intake and exhaust through the same jet port 231, allows for a more compact structure of the first jet piezoelectric fan 230, reducing its thickness and facilitating a thinner and lighter design. For example, the thickness of the first jet piezoelectric fan 230 in this embodiment is less than or equal to 2mm, making it lightweight and not affecting the grip feel of the mobile phone 300.

[0140] Compared to traditional fans, such as conventional mechanical centrifugal fans, which are constrained by moving parts like bearings, stators, and rotors, and whose performance deteriorates drastically when used with mobile phones due to the variable direction of gravity, leading to increased transient stress, dust accumulation, and noise, the first jet piezoelectric fan 230 of this application does not require such moving parts, is unaffected by gravity, has no bearings, and does not require a lubrication system. Users can clean and replace the fan themselves, and there is no need to add thermal interface materials or metal structures such as heat sink fins to ensure heat dissipation.

[0141] On the other hand, compared to traditional piezoelectric fans, taking the vibrating plate piezoelectric fan as an example, this type of fan uses the piezoelectric effect to drive an excited vibrating plate to generate airflow. Although it is thin, it produces a smaller air volume and lower wind speed, limiting its application range to niche areas such as gaming phones. Therefore, to adapt to a wider range of applications, improved heat dissipation is needed. This requires the simultaneous use of copper or aluminum heat sinks, liquid cooling systems, or thermoelectric coolers (TECs) to collect heat and ensure effective heat dissipation. This makes it impossible to achieve a thin and light design for the heat dissipation module. When applied to mobile phones, this increases the phone's weight and affects the user's grip experience.

[0142] Furthermore, taking the traditional jet piezoelectric fan as an example, the air inlet and outlet of the traditional jet piezoelectric fan are generally located on different sides, that is, the air inlet and outlet are separated, which will cause a certain airflow loss and affect the heat dissipation efficiency of the jet piezoelectric fan.

[0143] For example, refer to Figure 3B , Figure 3B An exemplary schematic diagram of a conventional synthetic jet piezoelectric fan 400 is shown, wherein the air inlet 431 and the air outlet 441 of the synthetic jet piezoelectric fan 400 are located on different sides.

[0144] Firstly, the synthetic jet piezoelectric fan 400 possesses outstanding characteristics such as simple structure, wide operating bandwidth, rapid response, good repeatability, and ease of miniaturization, making it one of the most researched and widely applicable synthetic jet exciters. Its main drawback is the low energy level or relatively low airflow of the synthetic jet. Especially in the region near the jet inlet, the vortex rings are not fully developed, resulting in low airflow; however, at locations further away from the jet inlet, typically ≥5mm, the vortex rings are fully developed, entraining surrounding air into the vortex, resulting in high airflow and good heat dissipation.

[0145] But more importantly, Figure 3B The air inlet 431 and air outlet 441 of the synthetic jet piezoelectric fan 400 shown are located on different sides. Compared with the first jet piezoelectric fan 230 used in the embodiments of this application, this feature of the synthetic jet piezoelectric fan 400 will cause airflow loss as described above, affecting the heat dissipation efficiency of the jet piezoelectric fan.

[0146] Specifically, the synthetic jet piezoelectric fan 400 includes: a piezoelectric vibrator 401, a cavity 420, an air inlet channel 430, and an air outlet channel 440. The cavity 420 has a first jet port 421, the air inlet channel 430 has a second jet port (i.e., air inlet 431), and the air outlet channel 440 has a third jet port (i.e., air outlet 441).

[0147] like Figure 3B As shown, the piezoelectric vibrator 401 is located outside the cavity 420. The cavity 420 is connected to the air inlet channel 430 through the first jet port 421. The air inlet channel 430 is connected to the air outlet channel 440. The air outlet channel 440 is connected to the external airflow.

[0148] When the conventional synthetic jet piezoelectric fan 400 is running, the airflow first flows into the air intake channel 430 from the air inlets 431 on both sides (i.e., the two sides indicated by direction F in Figure 3). At the same time, the piezoelectric vibrator 401 generates high-frequency vibration. The working process is divided into two processes: air intake and air pumping. During the air intake process, the volume of the cavity 420 increases, and a large amount of air enters from the air inlet 431, while a small amount of air enters from the air outlet. During the air pumping process, the volume of the pump chamber decreases, and a large amount of air is jetted out from the cavity 420. This causes the cavity 420 to alternately blow and suck airflow in the air intake channel 430 through the first jet port 421. The airflow blown out from the first jet port 421 forms a vortex ring due to shearing action and flows directionally towards the air outlet channel 440, and is finally discharged from the air outlet 441 in the form of a high-speed jet.

[0149] However, the air inlet channel 430 and the air outlet channel 440 are set at an angle (for example, perpendicular to each other as shown in Figure 3). In other words, the air inlet 431 and the air outlet 441 are located on different sides. Therefore, after the outside airflow enters the air inlet 431, it will flow a certain distance within the air inlet channel 430, resulting in high flow resistance and airflow loss, leading to a reduction in air volume. For example, at a pressure of 1 kPa, only less than 2 L of gas can flow through per minute. Moreover, the first jet port 421 of the cavity 420 used to excite the vibration of air particles can only act on the airflow within the air inlet channel 430, but is isolated from the air surrounding the synthetic jet piezoelectric fan 400, and cannot effectively sweep the surrounding airflow, resulting in reduced airflow efficiency and increased energy loss. At the same time, after the jet is formed at the first jet port 421, the airflow needs to enter the air outlet channel 440, which is perpendicular to the air inlet channel 430, and further airflow loss will occur during this process.

[0150] Therefore, since the air inlet 431 and air outlet 441 of the traditional synthetic jet piezoelectric fan 400 are separated (i.e. located on different sides), the heat dissipation efficiency is low. If its heat dissipation capacity is to be improved, the thickness of the synthetic jet piezoelectric fan 400 needs to be increased (for example, when the length is 24mm, the width is 41mm, and the thickness is 2.5mm, the flow rate can only reach: 5.9L of gas per minute at a pressure of 1750Kpa). This makes it impossible to achieve a thin and light design of the heat dissipation module. When it is applied to mobile phones, it will increase the weight of the phone and affect the user's grip experience.

[0151] Based on this, refer to Figure 3A and Figure 3B As can be seen from the preceding text, the first jet piezoelectric fan 230 in this embodiment of the application has a better heat dissipation effect because both the air inlet and outlet are achieved through the same jet port 231.

[0152] refer to Figure 4 and combined Figure 2A In this embodiment, a thermal gain test was conducted on a mobile phone 300 equipped with a heat dissipation module 200 to evaluate the heat generation and heat dissipation efficiency of the mobile phone 300 during operation.

[0153] like Figure 4 As shown, Figure 4 The graph shows the thermal gain curves of the same heat dissipation module 200 at different test positions of the mobile phone 300 under the same tilt angle.

[0154] Specifically, first, the mobile phone 300 with the heat dissipation module 200 installed is placed in a windless temperature chamber, and the ambient temperature is maintained at 23°C. The rotating part is adjusted to an angle α of 45° between itself and the heat-generating surface of the back cover 310. The jet nozzle of the first jet piezoelectric fan 230 on the rotating part 220 faces the back cover 310. Then, the mobile phone 300 is put into a game spectator mode with high frame rate and high-definition image quality.

[0155] Secondly, the first jet piezoelectric fan 230 is not turned on, and the mobile phone 300 is allowed to run continuously for a certain period of time under the above test conditions. For example, with the first jet piezoelectric fan 230 off, the mobile phone 300 is run continuously for 8 minutes. It can be seen that the temperature curves of the four test locations of the back cover 310 (test point 1, such as the first heating surface 311), the back cover 310 (test point 2, such as the second heating surface 312), the mid-frame, and the screen increase relatively stably from 0 minutes to 8 minutes.

[0156] Then, when the first jet piezoelectric fan 230 is turned on, it can be seen that the temperature curves of the four test positions of the back cover 310, namely test point 1 (e.g., the first heating surface 311, hereinafter referred to as test point 1), test point 2 of the back cover 310 (e.g., the second heating surface 312, hereinafter referred to as test point 2), the middle frame, and the screen, drop sharply.

[0157] refer to Figure 4 And in conjunction with Table 1 and Figure 2A Table 1 lists the temperature data at the four test locations when the first jet piezoelectric fan 230 is turned off and on.

[0158] Table 1: Temperature test data of mobile phone at different test points with the first jet piezoelectric fan off and on.

[0159]

[0160] Under the above test conditions, when the first jet piezoelectric fan 230 is off, the test temperature at test point 1 is 39.0℃. After the first jet piezoelectric fan 230 is turned on, the test temperature at test point 1 is 31.7℃. That is to say, the first jet piezoelectric fan 230 cools test point 1 by 7.3℃.

[0161] Similarly, when the first jet piezoelectric fan 230 is off, the test temperature at test point 2 is 37.7℃. After the first jet piezoelectric fan 230 is turned on, the test temperature at test point 2 is 30.5℃. That is to say, the first jet piezoelectric fan 230 cools test point 1 by 7.2℃.

[0162] Similarly, when the first jet piezoelectric fan 230 is off, the test temperature of the middle frame is 39.4℃. After the first jet piezoelectric fan 230 is turned on, the test temperature of the middle frame is 36.3℃. That is to say, the first jet piezoelectric fan 230 cools the middle frame by 3.1℃.

[0163] Similarly, when the first jet piezoelectric fan 230 is off, the screen's test temperature is 39.6℃. After the first jet piezoelectric fan 230 is turned on, the screen's test temperature is 37.2℃. That is to say, the first jet piezoelectric fan 230 cools the screen by 2.4℃.

[0164] In summary, the heat dissipation module 200 provided in this application embodiment can be externally mounted on the mobile phone 300 without occupying the internal space of the mobile phone 300, effectively avoiding conflicts with the thin and light design of the mobile phone 300. Furthermore, the heat dissipation module 200 has excellent heat dissipation capabilities, reducing the temperature by 2℃ to 10℃, increasing the heat dissipation capacity to 70mA / ℃ to 200mA / ℃, and can selectively dissipate heat from the mobile phone 300. It does not require conductive materials such as thermal interface materials, nor does it require heavy metal structural components such as heat sinks (e.g., heat dissipation fins).

[0165] The specific structure of the heat dissipation module 200 of the present application embodiment will be further described below with reference to the accompanying drawings.

[0166] refer to Figures 5 to 7 , Figure 5 A perspective view of a heat dissipation module 200 according to an embodiment of this application is shown; Figure 6 A second perspective view of the heat dissipation module 200 according to an embodiment of this application is shown; Figure 7 A perspective view of the heat dissipation module 200 according to an embodiment of this application is shown in Figure 3.

[0167] In this first embodiment, the mounting part 210 has a rectangular plate structure, and the mounting part 210 has a second direction (e.g., Figure 5 The first surface 2101 and the second surface 2102, which are arranged relative to each other in the Z direction (as shown in the figure), are further combined. Figure 2A The second surface 2102 of the mounting part 210 is connected to the back cover 310 of the mobile phone 300, and the rotating part 220 is connected to the first surface 2101 of the mounting part 210.

[0168] Continue to refer to Figures 5 to 7 In this first embodiment, the rotating part 220 is an incomplete rectangular structure, that is, the rotating part 220 has a first opening 2200 (e.g., Figure 7 As shown, the rotating part 220 includes a first end 2201 and a second end 2202 disposed opposite to each other, and the second end 2202 is located at the first opening 2200.

[0169] It should be noted that the shape of the mounting part 210 is not specifically limited in the embodiments of this application. As long as the mounting part 210 can be installed on the mobile phone 300, it falls within the protection scope of the embodiments of this application. At the same time, the shape of the rotating part 220 is not specifically limited in the embodiments of this application. As long as it can rotate relative to the mounting part 210 and is used for mounting the first jet piezoelectric fan 230, it falls within the protection scope of the embodiments of this application.

[0170] Exemplarily, the mounting portion 210 further includes a mounting member 211, which is fixed to the first surface 2101 of the mounting portion 210 and is used for rotatable connection with the rotating portion 220. Specifically, the mounting member 211 includes two components along a third direction (e.g., Figure 5 The hinge seats 2111 are arranged opposite each other in the X direction shown in the figure, and each hinge seat 2111 is provided with a first connection hole 21110.

[0171] The first end 2201 of the rotating part 220 is provided with a second connecting hole (not shown in the figure), and the second connecting hole corresponds to the first connecting hole 21110. For example, a hinge shaft (not shown in the figure) is passed through both the first connecting hole 21110 and the second connecting hole, so that the second connecting hole of the first end 2201 in the rotating part 220 and the first connecting hole 21110 of the hinge seat 2111 in the mounting part 210 are kept connected, and the first end 2201 and the hinge seat 2111 can rotate relative to each other. That is to say, in this embodiment, the first end 2201 of the rotating part 220 can serve as a first rotating shaft, thereby realizing the rotational connection between the rotating part 220 and the mounting part 210.

[0172] Continue to refer to Figures 5 to 7 The first jet piezoelectric fan 230 is mounted on the rotating part 220 and located between the first end 2201 and the second end 2202. Exemplarily, the first jet piezoelectric fan 230 can be mounted on the rotating part 220 by a detachable method such as pasting, or it can be mounted on the rotating part 220 by a fixing method such as welding. This application embodiment does not limit this.

[0173] In some possible implementations, the heat dissipation module 200 further includes an operating element 240 for user operation. Exemplarily, the operating element 240 may serve as such as... Figure 6 The finger clip shown allows users to thread their fingers through it, making the grip more stable and reducing the risk of dropping the phone.

[0174] For example, the operating element 240 can also be used as... Figure 8 The bracket shown, when open, allows the phone to contact the outside; that is, the operating element 240 can be used as... Figure 8The bracket shown allows the phone to be supported on, for example, a desktop 500. Exemplarily, the heat dissipation module 200 may also omit the operating element 240; this embodiment of the application does not impose any limitations on this.

[0175] In this embodiment, the operating member 240 is an incomplete ring, that is, the operating member 240 has a second opening 2400 (e.g., Figure 7 As shown), the second opening 2400 corresponds to the first opening 2200 of the rotating part 220.

[0176] like Figure 7 As shown, the operating component 240 includes a connected arc segment 241 and a connecting segment 242. Exemplarily, the arc segment 241 is a superior arc, but it can also be a inferior arc. The embodiments of this application do not limit the shape of the arc segment 241 and the connecting segment 242.

[0177] Among them, further integration Figure 6 The connecting section 242 is provided with a third connecting hole 2420; the second end 2202 of the rotating part 220 is provided with a fourth connecting hole (not shown in the figure), and the third connecting hole 2420 and the fourth connecting hole (not shown in the figure) correspond to each other. For example, a hinge shaft (not shown in the figure) is simultaneously inserted through the third connecting hole 2420 and the fourth connecting hole, so that the fourth connecting hole of the second end 1201 in the rotating part 220 and the third connecting hole 2420 in the connecting section 242 in the operating member 240 remain connected, and the second end 2202 and the operating member 240 can rotate relative to each other. Thus, the rotating part 220 and the operating member 240 are rotated together.

[0178] Continue to refer to Figures 5 to 7 The heat dissipation module 200 in this embodiment of the application has the following characteristics: Figure 5 The folding state shown is as follows: Figure 6 The transition states shown and as Figure 7 The open state is shown.

[0179] Specifically, such as Figure 5 As shown, when the heat dissipation module 200 is in the folded state, the rotating part 220 and the mounting part 210 are either in contact or spaced apart. That is, the extension surface of the rotating part 220 and the first surface 2101 of the mounting part 210 coincide or are parallel to each other. Moreover, the arc-shaped segment 241 of the operating member 240 surrounds the first jet piezoelectric fan 230. At the same time, the three jet outlets of the first jet piezoelectric fan 230 face each other in the second direction and are directed toward the mounting part 210.

[0180] It should be noted that the first jet piezoelectric fan 230 can still operate in the folded state. That is to say, external airflow can flow into the jet port through the gap (not shown in the figure) between the mounting part 210 and the first jet piezoelectric fan 230. Correspondingly, the high-speed jet flowing out of the jet port can flow through this gap over the heat-generating surface of the phone's back cover (e.g., Figure 2A (The first heating surface 311 or the second heating surface 312 shown). Exemplarily, in this folded state, the three jet outlets of the first jet piezoelectric fan 230 are at a distance from the heating surface of the rear cover (e.g., ...). Figure 2A The first heating surface 311 or the second heating surface 312 shown is less than 2mm, and the air volume reaches 2L / min to 4L / min at this time.

[0181] For example, the first jet piezoelectric fan 230 may not operate in the folded state. This application embodiment does not impose specific restrictions on whether the first jet piezoelectric fan 230 operates in the folded state, and users can choose according to the actual application situation.

[0182] like Figure 5 and Figure 6 As shown, when the user needs to use the heat dissipation module 200, they can grasp and manipulate the arc-shaped segment 241 of the operating member 240, and move it in a direction along the first direction toward the first heat-generating surface (e.g., Figure 5 The operating member 240 is pulled in the T1 direction shown in the figure, thereby moving the operating member 240 away from the first surface 2101 of the mounting portion 210, so that the heat dissipation module 200 is in a position as shown in the figure. Figure 6 The transition state shown.

[0183] like Figure 6 and Figure 7 As shown, further, the user needs to, for example, move upwards (such as...). Figure 6 The operating member 240 is pulled up in the Z1 direction shown in the figure, and then continues in the direction away from the first heating surface along the first direction (e.g., Figure 6 The operating member 240 is pulled in the T2 direction shown in the figure to cause the rotating part 220, which is rotatably connected to the operating member 240, to rotate away from the first heating surface in the first direction.

[0184] Finally, switch the operating unit 240 to the position shown. Figure 7 The open state shown is such that the jet outlet of the first jet piezoelectric fan 230 provided on the rotating part 220 faces the first heating surface or the second heating surface of the back cover of the mobile phone.

[0185] In some possible implementations, the jet outlet 231 of the first jet piezoelectric fan 230 can be adjusted by the rotating part 220 to a position greater than or equal to 2 mm from the first heating surface (or the second heating surface), for example, a distance of 2 mm, 2.5 mm, 3 mm, 5 mm, etc. Within this distance range, the airflow can reach as high as 6 L / min to 8 L / min, the airflow is less obstructed, and it is more conducive to the free diffusion and flow of the airflow generated by the first jet piezoelectric fan 230. The working environment of the first jet piezoelectric fan 230 is closer to a low-resistance free field, which is beneficial to improving the heat dissipation efficiency of the first jet piezoelectric fan 230.

[0186] refer to Figure 9 and combined Figure 6 In some possible implementations, such as Figure 6 As shown, the rotating part 220 includes a first recess 221, and the operating member 240 includes a second recess 243, as... Figure 9 As shown, in the folded state, the first recess 221 and the second recess 243 are in contact. Using this technical solution, the first recess 221 of the rotating part 220 and the second recess 243 of the operating member 240 can be in contact in the folded state, making the structure of the heat dissipation module 200 compact in the folded state, which is beneficial for the lightweight and thin design of the heat dissipation module 200.

[0187] In some possible implementations, the rotating part 220 may also be equipped with an automatic pop-out device (not shown in the figure), which may be powered by, for example, a button battery in the back clip or a battery inside the mobile phone. The first jet piezoelectric fan 230 is then connected to the automatic pop-out device. When the first jet piezoelectric fan 230 overheats, its internal temperature sensor detects the temperature increase and a temperature threshold can be preset. When the temperature exceeds this threshold, the first jet piezoelectric fan 230, which is wired-powered by the battery inside the mobile phone, can automatically pop out. In other possible implementations, the automatic pop-out of the first jet piezoelectric fan 230 can also be controlled by software commands.

[0188]

Example 2

[0189] Figure 10 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 4 .

[0190] Refer to this second embodiment. Figure 10 , Figure 11 , Figure 12 and the above-described embodiment one Figure 5 , Figure 6 , Figure 7As can be seen, the differences between this embodiment 2 and the heat dissipation module 200 in embodiment 1 are: the structure of the mounting part 210 is different; the connection method between the mounting part 210 and the mobile phone 300 is different; the setting method between the rotating part 220 and the mounting part 210 is different; and the rotating part 220 serves as the operating member 240. The identical structural parts of each embodiment will not be described again in the following text.

[0191] refer to Figure 10 In this second embodiment, the mounting part 210 is a phone case adapted to the mobile phone 300 (it can also be a tablet battery back cover or tablet back clip, etc., mobile terminal products), along the second direction (e.g. Figure 5 (As shown in the Z direction), the first surface 2101 and the second surface 2102 of the mounting portion 210 are connected by a fastening portion 2103, which is the periphery of the mounting portion 210. Figure 10 As shown, the mounting part 210 can be fastened to the back cover 310 of the mobile phone 300, and the second surface 2102 of the mounting part 210 is in contact with the back cover 310, and the fastening part 2103 is attached to the middle frame of the mobile phone 300.

[0192] Continue to refer to Figure 10 In this second embodiment, the rotating part 220 is a complete annular structure. The mounting member 211 of the mounting part 210 is disposed on the first surface 2101. In this second embodiment, the mounting member 211 includes a second rotating shaft 2112, and the first end 2201 of the rotating part 220 is rotatably connected to this rotating shaft 2112. In this second embodiment, the first end 2201 of the rotating part 220 may not serve as a rotating shaft, but may instead be rotatably connected to the second rotating shaft 2112. Simultaneously, the mounting part 210 also includes a receiving part 2104 for accommodating the rotating part 220.

[0193] For example, the aforementioned receiving portion 2104 may also be configured as a rotating bracket capable of circumferentially rotating relative to the mounting portion 210, which can also be received by the mounting portion 210.

[0194] For example, embodiments of this application may employ a second rotating shaft 2112 with a locking function, that is, the second rotating shaft 2112 can stop and lock at any position during the rotation process.

[0195] The first jet piezoelectric fan 230 is mounted on the rotating part 220 and located between the first end 2201 and the second end 2202. Exemplarily, the first jet piezoelectric fan 230 can be mounted on the rotating part 220 by means of pasting, welding or other methods, and this application embodiment does not limit this.

[0196] Furthermore, unlike the operating member 240 in Embodiment 1, in this Embodiment 2, the rotating part 220 is the operating member 240.

[0197] When the heat dissipation module 200 is in the folded state, the rotating part 220 is accommodated in the aforementioned accommodating part 2104 of the mounting part 210, and the extension surface of the rotating part 220 and the first surface 2101 of the mounting part 210 are on the same plane. For example, the arcuate segment 241 of the rotating part 220, which serves as the operating member 240, surrounds the first jet piezoelectric fan 230.

[0198] When the user needs to use the heat dissipation module 200, they can grasp and manipulate the arc-shaped segment 241 of the rotating part 220, which serves as the operating member 240, and move it away from the mounting part 210 in a direction along the first direction (e.g., Figure 10 The rotating part 220 is pulled in the T2 direction shown in the figure, thereby moving the rotating part 220 away from the first surface 2101 of the mounting part 210.

[0199] For example, the rotating part 220, which is operated as the operating element 240, is stopped at such a position. Figure 10 At the position shown, the rotating part 220 is switched to the open state, and the rotating part 220 (in this embodiment 2, that is, the operating member 240) and the first surface of the mounting part 210 are also at an angle α (e.g., Figure 2A (As shown in the image) settings.

[0200] refer to Figure 11 and Figure 12 , Figure 11 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 5 . Figure 12 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 6 .

[0201] In this second embodiment, the jet outlet of the first jet piezoelectric fan 230 is at an angle θ. Specifically, the high-speed jet blown out by the jet outlet of the first jet piezoelectric fan 230 can flow along the dashed line segment a→b→c→d, where dashed line segment a→b represents the high-speed jet blown out by the jet outlet, dashed line segment b→c can cover the first heating surface of the rear cover 310 (the first heating surface exemplarily corresponds to the internal component 330), and dashed line segment c→d represents the airflow diffusing to the outside.

[0202] Meanwhile, the dashed line segment a→b forms an angle θ with the surface of the first jet piezoelectric fan 230. For example, 0<θ≤45°. That is to say, the airflow direction of the jet outlet is set at an angle θ with the first jet piezoelectric fan 230, so that the high-speed jet blown out of the jet outlet can cover more areas. Moreover, the non-vertical air outlet can break the laminar flow state of the air, increase the degree of air turbulence, adapt to different working conditions, and improve the heat dissipation effect.

[0203] refer to Figure 12In some possible implementations, the first jet piezoelectric fan 230 of this application embodiment can also be configured as two, with the two first jet piezoelectric fans 230 spaced apart on the rotating part 220. However, this application embodiment does not limit the number of first jet piezoelectric fans 230, for example, it can also be configured as three, four, five or more first jet piezoelectric fans 230.

[0204]

Example 3

[0205] Figure 13 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 7 . Figure 14 A three-dimensional view of the heat dissipation module 200 according to an embodiment of this application is shown. Figure 6 .

[0206] Refer to this embodiment three. Figure 13 and Figure 14 and Example 2 Figure 10 , Figure 11 , Figure 12 It can be seen that the difference between the heat dissipation module 200 in Embodiment 3 and Embodiment 2 is that the structure of the mounting part 210 is different.

[0207] refer to Figure 13 and Figure 14 In this third embodiment, the mounting part 210 has a frame structure.

[0208] Specifically, the mounting part 210 includes a connector 212, which includes four legs 2121, such as... Figure 13 As shown, the four legs 2121 are respectively attached to the four corners of the mobile phone 300, and the four legs 2121 define four through holes 213, which expose the back cover 310.

[0209] For example, the number of legs 2121 is not specifically limited in the embodiments of this application. For example, one, three, six, seven or other numbers of legs 2121 can be set. As long as the mounting part 210 can be snapped onto the mobile phone 300, they are all within the protection scope of the embodiments of this application.

[0210] It should be noted that, in this third embodiment, although Figure 14 The mounting component of the mounting part 210 is not shown in the figure, but it can be understood that the mounting part 210 in both Embodiment 3 and Embodiment 2 is provided with a mounting component for rotatably connecting the rotating part 220. That is, in Embodiment 3, the first surface 2101 is still provided with a rotating shaft 2112. Figure 14 The exemplary location of the rotating shaft 2112 is shown, and will not be described in detail here.

[0211]

Example 4

[0212] Figure 15 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 8 .

[0213] Refer to the fourth embodiment of this example. Figure 15 and Example 2 Figure 10 , Figure 11 , Figure 12 It can be seen that the difference between the heat dissipation module 200 in Embodiment 4 and Embodiment 2 is that the first jet piezoelectric fan 230 is rotatably connected to the rotating part 220, that is, the first jet piezoelectric fan 230 can further rotate relative to the rotating part 220.

[0214] refer to Figure 15 In this fourth embodiment, the first jet piezoelectric fan 230 can rotate relative to the rotating part 220, such as... Figure 15 As shown, the first jet piezoelectric fan 230 can rotate relative to the rotating part in the P direction. Therefore, in this fourth embodiment, the angle of the first jet piezoelectric fan 230 can be further adjusted so that it faces different heat-generating parts (such as different internal components 330 in the rear cover 310 mentioned above, or even the lens module) for selective heat dissipation, so as to adapt to different working conditions and achieve the best heat dissipation effect.

[0215] At the same time, such as Figure 15 As shown, in this fourth embodiment, the high-speed jet blown out by the jet outlet of the first jet piezoelectric fan 230 can flow along the dashed line segment e→f→g→h, where the dashed line segment e→f represents the high-speed jet blown out by the jet outlet, the dashed line segment f→g covers the first heating surface (which exemplarily corresponds to the internal component 330), and the dashed line segment g→h represents the airflow diffusing to the outside. Moreover, in this fourth embodiment, the dashed line segment e→f is perpendicular to the surface of the first jet piezoelectric fan 230, that is, the jet outlet of the first jet piezoelectric fan 230 discharges air vertically.

[0216] Furthermore, in this fourth embodiment, as... Figure 15 In the open state shown, the rotating part 220 and the mounting part 210 are set at an acute angle. However, the present application embodiment does not limit the angle between the rotating part 220 and the mounting part 210. For example, the rotating part 220 and the mounting part 210 may also be perpendicular to each other or set at an obtuse angle.

[0217] Example 5

[0218] Figure 16 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 9 .

[0219] Refer to Example 5 Figure 16 and Example 2 Figure 10 , Figure 11 , Figure 12 As can be seen, the difference between the heat dissipation module 200 in Embodiment 5 and Embodiment 2 is that the heat dissipation module 200 in this embodiment is additionally provided with an auxiliary heat dissipation part 250, on which a second jet piezoelectric fan 260 is provided. The second jet piezoelectric fan 260 is used to dissipate heat from the screen 340 of the mobile phone 300, and the structure and principle of the second jet piezoelectric fan 260 are the same as those of the first jet piezoelectric fan 240 in Embodiments 1 to 4.

[0220] refer to Figure 16 As can be seen, along the second direction (such as...) Figure 16 (As shown in the Z direction), the additional heat dissipation part 250 and the rotating part 220 are located on opposite sides of the mounting part 210. The second jet piezoelectric fan 260 provided in the additional heat dissipation part 250 is directed toward the screen 340 of the mobile phone 300. It can be understood that the jet outlet of the second jet piezoelectric fan 260 is directed toward the heat-generating surface of the screen 340.

[0221] Furthermore, in this sixth embodiment, Figure 16 The rotating part 220 and the mounting part 210 shown are perpendicular to each other, but the angle between the rotating part 220 and the mounting part 210 is not limited in this embodiment. For example, the rotating part 220 and the mounting part 210 may also be set at an acute angle or an obtuse angle.

[0222] In this sixth embodiment, in addition to the first jet piezoelectric fan 230 dissipating heat from the back cover 310, an additional heat dissipation unit 250 with a second jet piezoelectric fan 260 can be provided on the side of the screen 340 of the mobile phone 300, thereby achieving effective heat dissipation of the screen 340. As a result, the temperature can be reduced by, for example, 2°C to 10°C, and the heat dissipation capacity can be increased to, for example, 70mA / °C to 200mA / °C. Furthermore, selective heat dissipation of the mobile phone can be achieved.

[0223] Example 6

[0224] Figure 17 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 . Figure 18 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 one.

[0225] Refer to this embodiment six. Figure 17 , Figure 18 and Example 4 Figure 15As can be seen, the difference between the heat dissipation module 200 of Embodiment Six and Embodiment Four is that the mounting part 210 includes a through hole 213 for exposing the back cover 310 of the mobile phone 300. When the mounting part 210 is installed on the back cover 310, the through hole 213 causes the mounting part 210 and the back cover 310 to define a flow channel 2130.

[0226] refer to Figure 17 The mounting portion 210 has a through hole 213, thereby exposing the rear cover 310. The sidewall of the through hole 213 (not shown in the figure) and the rear cover 310 define a... Figure 17 The irregularly shaped flow channel 2130 shown is such that the jet outlet of the first jet piezoelectric fan 230 is positioned facing the flow channel 2130. This embodiment does not limit the shape of the flow channel 2130; for example, it can be rectangular, trapezoidal, or other shapes, and can be selected according to actual heat dissipation requirements.

[0227] refer to Figure 18 and combined Figure 17 It can be understood that in this sixth embodiment, when the first jet piezoelectric fan 230 is running, the high-speed jet blown out (such as...) Figure 18 The dashed line segment a→b' shown can be directly sprayed onto the heating surface of the back cover 310, and flows through the flow channel 2130 (such as...). Figure 18 During the process from the dashed line segment b' to c', heat exchange occurs directly with the rear cover 310, and the flow channel 2130 guides the high-speed jet, improving heat dissipation efficiency. Simultaneously, the flow channel 2130's guidance of airflow also ensures more uniform heat dissipation from the rear cover 310. Therefore, in this sixth embodiment, there is no need to install metal structural components such as heat dissipation fins.

[0228] Further, refer to Figure 19 and combined Figure 17 In this sixth embodiment, a thermal performance test was conducted on the mobile phone 300 equipped with a heat dissipation module 200 in this sixth embodiment to evaluate the heat generation and heat dissipation efficiency of the mobile phone 300 during operation.

[0229] like Figure 17 As shown, along the length direction of the phone 300 (e.g.) Figure 17 (as shown in the Y direction), the first jet piezoelectric fan 230 is positioned at the bottom end of the rear cover 310 (i.e., the Y direction). Figure 17 (the end pointed to in the Y2 direction), and along the width direction of the phone 300 (such as...). Figure 17 (shown in the X direction), the first jet piezoelectric fan 230 is located at the middle of the bottom end of the rear cover 310.

[0230] like Figure 19 As shown, Figure 19Figure 2 shows the thermal gain curves of the same heat dissipation module 200 at different test positions on the mobile phone under the same tilt angle. A total of 9 test points were selected for this thermal gain test, of which 8 test points were selected from a portion of the heat-generating surface of the back cover 310 exposed to the above-mentioned through hole 213 in Embodiment 6, and 1 test point was the surrounding environment of the mobile phone 300.

[0231] As can be seen, when the phone 300 is run for a certain period of time, the temperature curves at all nine test points rise relatively steadily during that time. Then, when the first jet piezoelectric fan 230 is turned on, the temperature curves at all nine test points drop sharply.

[0232] refer to Figure 17 and Figure 19 In conjunction with Table 2, which lists the temperature data of the above 9 test locations when the first jet piezoelectric fan 230 is turned off and on.

[0233] Table 2: Temperature test data of mobile phone at different test points with the first jet piezoelectric fan off and on.

[0234]

[0235] Refer to Table 2 and combine with Figure 17 The eight test points in Table 2 are all located within the flow channel 2130 defined by the through hole 213 of the mounting part 210 and the rear cover 310, and at an ambient temperature.

[0236] As can be seen, along the fourth direction (e.g.) Figure 17 As shown in the Y direction), test points 1, 2, and 4 are all close to the first jet piezoelectric fan 230 (that is, close to the bottom of the mobile phone 300, i.e., the end indicated by the Y2 direction), along the third direction (such as... Figure 17 (As shown in the X direction), test point 2 is located in the middle, and test point 1 is located to the left of test point 2 (i.e., ...). Figure 17 Test point 4 is located to the right of test point 2 (i.e., the side indicated by X1 in the middle). Figure 17 (The side indicated by the X2 direction).

[0237] Under the same test conditions, after turning on the first jet piezoelectric fan 230, test point 1 can achieve a temperature drop of 5.5℃, test point 2 can achieve a temperature drop of 7.9℃, and test point 4 can achieve a temperature drop of 5.3℃, but there is no effective cooling effect on the surrounding environment.

[0238] Continue to refer to Table 2 and combine with Figure 17 The positions of test points 5 and 6 are relatively close to the back cover 310 along the fourth direction (e.g. Figure 17 The test point 6 is located at the midpoint of the Y-direction shown in the diagram, and along the fourth direction, it is closer to the lens module 320. Further, along the third direction (e.g., ... Figure 17 (As shown in the X direction), test point 5 is near the right side of the back cover 310 (i.e., Figure 17 (The side indicated by X2 in the middle), test point 6 is near the left side of the back cover 310 (i.e. Figure 17 (The side indicated by the X1 direction).

[0239] Under the same test conditions, after turning on the first jet piezoelectric fan 230, test point 5 can achieve a temperature drop of 6.1℃, and test point 6 can achieve a temperature drop of 5.5℃.

[0240] Continue to refer to Table 2 and combine with Figure 17 Along the fourth direction (e.g.) Figure 17 (As shown in the Y direction), test points 7, 8, and 9 are closer to the top of the phone 300 (that is, further away from the first jet piezoelectric fan 230, as shown in the Y direction). Figure 17 (as indicated by Y1 direction), among which, in the fourth direction, test point 7 is closer to the first jet piezoelectric fan 230, followed by test point 8, while test point 9 is farthest from the first jet piezoelectric fan 230; in the third direction (such as... Figure 17 (As shown in the X direction), test point 8 is closer to lens module 320.

[0241] Under the same test conditions, after turning on the first jet piezoelectric fan 230, test point 7 can achieve a temperature drop of 4.7℃, test point 8 can achieve a temperature drop of 6.0℃, and test point 9 can achieve a temperature drop of 4.6℃.

[0242]

Example 7

[0243] Figure 20 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 two. Figure 21 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 three. Figure 22 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 Four; among them, Figures 20 to 22 Another mobile terminal provided in the embodiments of this application is shown, namely, a smartwatch 600. Figure 23 This diagram illustrates the principle of power supply to the heat dissipation module 200 according to an embodiment of this application.

[0244] Refer to this embodiment seven. Figures 20 to 22 and Example 1 Figure 1A , Figure 1B , Figure 2AIt can be seen that the difference between the heat dissipation module 200 in Embodiment 7 and that in Embodiment 1 is that: firstly, the heat dissipation module 200 is applied to another mobile terminal, that is, in Embodiment 7, the heat dissipation module 200 is applied to the smartwatch 600; secondly, the dial 610 can be flipped relative to the mounting part 210 or the connecting part 630 to change the relative position and angle.

[0245] refer to Figures 20 to 22 , Figure 20 and Figure 21 The diagrams illustrate different perspectives of the smartwatch 600 in an open state. Figure 22 An illustrative diagram of a smartwatch 600 in a stowed state is shown.

[0246] As can be seen, the smartwatch 600 includes a watch face 610, a watch band 620, and a connecting part 630. The watch band 620 includes a first watch band 621 and a second watch band 622. The connecting part 630 connects the first watch band 621 and the second watch band 622. One end of the watch face 610 is rotatably connected to the connecting part 630, and the other end of the watch face 610 can be fastened to the connecting part 630. Based on this, the watch face 610 can... Figure 20 The open state shown and as Figure 22 The smartwatch 600 switches between the displayed collapsed states. Figure 22 When the watch is in the retracted state as shown, it can be seen that the other end of the dial 610 is engaged with the connector 630. When the smartwatch 600 switches to the retracted state... Figure 20 When in the open state shown, the other end of the dial 610 is separated from the connecting part 630.

[0247] In practical applications of the smartwatch 600, when performing operations such as charging, prolonged video calls, or system updates, the watch face 610 of the smartwatch 600 will generate a certain amount of heat. In this embodiment seven, the back of the watch face 610 (also known as the back cover) can serve as a third heat-generating surface 611 (e.g., Figure 21 (as shown), but the dial 610 may also have other heating surfaces. This application embodiment does not limit this. The following description takes the back of the dial 610 as the third heating surface 611 as an example.

[0248] Therefore, in this seventh embodiment, a heat dissipation module 200 is installed on the connecting part 630. The heat dissipation module 200 can dissipate heat from the dial 610, for example, it can perform air cooling on the third heating surface 611.

[0249] In addition, such as Figure 20 and Figure 21As shown, in this embodiment seven, the mounting portion 210 of the heat dissipation module 200 is mounted on the third surface 631 of the connecting portion 630. When the heat dissipation module 200 is in the open state described above (refer to embodiment one), Figure 2A When the first jet piezoelectric fan 230 is in operation, the jet outlet (not shown in the figure) of the first jet piezoelectric fan 230 is directed toward the third heating surface 611 to dissipate heat from the third heating surface 611.

[0250] like Figure 22 As shown, when the smartwatch 600 is in the folded state, the heat dissipation module 200 can also dissipate heat on the third heat-generating surface 611 of the dial 610. That is, the heat dissipation module 200 can be switched to the folded state described above so that the rotating part 220 and the mounting part 210 of the heat dissipation module 200 are either in contact or spaced apart. At this time, the jet outlet of the first jet piezoelectric fan 230 (not shown in the figure) faces the third surface 631 of the connecting part 630, but not the third heat-generating surface 611. However, it is not in a free field with low wind resistance, so the air intake and exhaust are restricted, and the heat dissipation capacity decreases.

[0251] However, similar to Embodiment 1, when the first jet piezoelectric fan 230 is in the folded state, the high-speed jet flowing out of the jet port can also flow through the gap between the mounting part 210 and the first jet piezoelectric fan 230 through the third surface 631 and the third heating surface 611, thereby achieving a certain amount of heat dissipation for the third heating surface 611.

[0252] In some other possible implementations, in this seventh embodiment, the jet outlet of the first jet piezoelectric fan 230 can also be positioned directly toward the third heating surface 611 of the dial 610. For example, when the smartwatch 600 is switched to an on state (e.g., ... Figure 20 As shown), switch the heat dissipation module 200 to the open state (refer to Embodiment 1). Figure 2A At this time, the jet outlet of the first jet piezoelectric fan 230 is facing the third heating surface 611.

[0253] For example, the jet outlet of the first jet piezoelectric fan 230 in the folded state is directly facing away from the third surface 631 of the connecting part 630. That is to say, the mounting direction of the first jet piezoelectric fan 230 on the rotating part 220 in this embodiment 7 is opposite to the mounting direction of the first jet piezoelectric fan 230 on the rotating part 220 in embodiment 1. Thus, whether the smartwatch 600 is in the open state or the folded state, the first jet piezoelectric fan 230 of the heat dissipation module 200 in the folded or open state can face the third heat-generating surface 611.

[0254] refer to Figure 23 and combined Figure 21In some possible implementations, the heat dissipation module 200 of this embodiment seven can be powered by the smartwatch 600. For example... Figure 23 As shown, a pogo pin spring pin 604 can be installed on the connector 630 of the smartwatch 600. Figure 21 For illustrative purposes only, the structure of the pogo pin 604 can be referenced. Figure 23 Furthermore, the pogopin 604 is electrically connected to the first jet piezoelectric fan 230 of the heat dissipation module 200.

[0255] On the other hand, the third heating surface 611 of the dial 610 of the smartwatch 600 is provided with at least one contact 605. When the first jet piezoelectric fan 230 in the heat dissipation module is running, the contact 605 of the dial 610 can be electrically connected to the pogo pin 604, for example, when the smartwatch 600 is in a state such as... Figure 21 In the open state shown, contact 605 contacts the pogo pin spring pin 604 to achieve electrical connection.

[0256] It should be noted that the power supply method described in Embodiment 7 is also applicable to the power supply of Embodiments 1 to 6, as well as Embodiment 8 below.

[0257] In some possible implementations, the smartwatch 600 and the first jet piezoelectric fan 230 of the heat dissipation module 200 can also be powered by a flexible wire, and this application embodiment does not impose specific limitations on this.

[0258] Example 8

[0259] Figure 24 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 5. Among them, Figure 24 The mobile terminal provided in this application embodiment is shown: smartwatch 600.

[0260] Refer to Example 8 Figure 24 and Example 7 Figure 20 , Figure 21 , Figure 22 It can be seen that the difference between the heat dissipation module 200 of Embodiment 8 and Embodiment 7 is that the connection part 630 of the smartwatch 600 can be used as the mounting part 210 of the heat dissipation module 200.

[0261] refer to Figure 24 In other words, at this time, the rotating part 220 of the heat dissipation module 200 is rotatably connected to the connecting part 630. This can be understood as the rotating part 220 with the first jet piezoelectric fan 230 being directly provided on the connecting part 630 of the smartwatch 600.

[0262] Additionally, in this eighth embodiment, the jet outlet of the first jet piezoelectric fan 230 can also be positioned towards the third heating surface 611 of the dial 610. For example, when the smartwatch 600 is switched to an open state (e.g., ... Figure 24 As shown), switch the heat dissipation module 200 to the open state (refer to Embodiment 1). Figure 2A At this time, the jet outlet of the first jet piezoelectric fan 230 is facing the third heating surface 611.

[0263] For example, the jet outlet of the first jet piezoelectric fan 230 in the folded state is directly facing away from the third surface 631 of the connecting part 630. That is to say, the mounting direction of the first jet piezoelectric fan 230 on the rotating part 220 in this embodiment eight is opposite to the mounting direction of the first jet piezoelectric fan 230 on the rotating part 220 in embodiment one. Thus, whether the smartwatch 600 is in the open state or the folded state, the first jet piezoelectric fan 230 of the heat dissipation module 200 in the folded or open state can face the third heat-generating surface 611.

[0264] Example 9

[0265] Figure 25 This application illustrates the application of the heat dissipation module 200 according to an embodiment of this application. Figure 10 6. Among them, Figure 25 The mobile terminal provided in this application embodiment is shown: smartwatch 600.

[0266] Refer to Example 9 Figure 25 and Example 8 Figure 24 It can be seen that the heat dissipation module 200 of this embodiment 9 differs from that of embodiment 8 in the following ways: First, the heat dissipation module 200 of this embodiment 9 does not include the rotating part 220; second, the first jet piezoelectric fan 230 is directly installed in the mounting part 210 (connecting part 630); third, the first jet piezoelectric fan 230 does not have a folded state and an open state.

[0267] As can be seen from the foregoing, the watch face 610 of the smartwatch 600 in this embodiment of the application is rotatably connected to the first watch strap 621.

[0268] refer to Figure 25 In this embodiment nine, the first jet piezoelectric fan 230 is directly mounted on the connecting part 630, and the jet port of the first jet piezoelectric fan 230 is disposed away from the third surface 631 of the connecting part 630, that is, the jet port can face the third heating surface 611 of the dial 610.

[0269] Therefore, in this embodiment nine, when it is necessary to dissipate heat from the dial 610, the heat dissipation module 200 can be used to dissipate heat in either the retracted state or the open state of the smartwatch 600.

[0270] Specifically, in this ninth embodiment, the dial 610 can rotate relative to the connecting portion 630 via the third rotating shaft 604, so that the third heating surface 611 of the dial 610 faces the jet port (not shown in the figure) of the first jet piezoelectric fan 230. Therefore, when the dial 610 rotates relative to the connecting portion 630 to switch to... Figure 25 In the open state shown, the first jet piezoelectric fan 230 provided on the connecting part 630 can dissipate heat to the third heating surface 611 (e.g., Figure 25 (The dashed arrow is shown). When the dial 610 is rotated to the retracted state relative to the connecting part 630, the jet outlet of the first jet piezoelectric fan 230 is directly facing the third heating surface 611 of the dial 610.

[0271] In summary, the heat dissipation module provided in this application embodiment can be externally mounted on mobile terminals such as mobile phones (e.g., ordinary candybar phones, or foldable phones) and watches (e.g., smartwatches), without occupying the internal space of the mobile terminal, effectively avoiding conflicts with the thin and light design of mobile terminals such as mobile phones and watches. Furthermore, the heat dissipation module has excellent heat dissipation capabilities, for example, it can reduce the temperature by, for example, 2℃ to 10℃, and the heat dissipation capacity is increased to, for example, 70mA / ℃ to 200mA / ℃, and it can selectively dissipate heat from the mobile terminal.

[0272] Furthermore, the mobile terminal products such as mobile phones and smartwatches provided in this application, which use external jet piezoelectric fans for heat dissipation, do not preclude the use of micro-fans for internal air cooling within the mobile terminal. On the contrary, the external jet piezoelectric fan has a higher priority for activating air cooling, which helps reduce the probability of the micro-fans inside the mobile terminal starting up. This reduces the likelihood of dust, fibers, and dirt accumulating on the micro-fans affecting the performance and reliability of the mobile terminal, significantly increasing the actual lifespan of the micro-fans—a vulnerable component—and achieving a better and stronger heat dissipation effect.

Claims

1. A heat dissipation module, applied in a mobile terminal, characterized in that, include: Mounting part, the mounting part being used for mounting on the mobile terminal; A rotating part, which is rotatably connected to the mounting part; A first jet piezoelectric fan is disposed on the rotating part. The first jet piezoelectric fan includes a jet port, which is directed toward the heating surface of the mobile terminal and is used for fluid inlet / outlet.

2. The heat dissipation module as described in claim 1, characterized in that, The heat dissipation module further includes an operating component. The rotating part includes a first end and a second end. The first end is rotatably connected to the mounting part, and the second end is rotatably connected to the operating component. The operating component is used for user operation to switch the rotating part between an open state and a folded state. In the folded state, the rotating part and the mounting part are either fitted together or spaced apart. In the open state, the rotating part and the mounting part are set at an angle.

3. The heat dissipation module as described in claim 2, characterized in that, The rotating part includes a first recess, and the operating member includes a second recess. In the folded state, the first recess and the second recess are in contact.

4. The heat dissipation module as described in claim 3, characterized in that, The operating element includes an arc-shaped segment, which, in the folded state, surrounds the first jet piezoelectric fan.

5. The heat dissipation module as described in any one of claims 1 to 4, characterized in that, The mounting part has a magnetic suction element, which is used to attach to the back cover of the mobile terminal.

6. The heat dissipation module as described in any one of claims 1 to 5, characterized in that, The mounting part includes a connector, the connector is provided with a support leg, the support leg is used to snap the mobile terminal, and the connector is rotatably connected to the rotating part.

7. The heat dissipation module as described in any one of claims 1 to 6, characterized in that, The mounting portion includes a through hole for exposing the back cover of the mobile terminal to form a flow channel, and the jet outlet is disposed toward the flow channel.

8. The heat dissipation module as described in any one of claims 1 to 7, characterized in that, The first jet piezoelectric fan is rotatably connected to the rotating part.

9. The heat dissipation module as described in any one of claims 1 to 8, characterized in that, The first jet piezoelectric fan includes a plurality of first jet piezoelectric fans, which are spaced apart on the rotating part.

10. The heat dissipation module as described in any one of claims 1 to 9, characterized in that, The thickness of the first jet piezoelectric fan is less than or equal to 2 mm.

11. The heat dissipation module as described in any one of claims 1 to 10, characterized in that, The heat dissipation module also includes an additional heat dissipation section, on which a second jet piezoelectric fan is provided. The additional heat dissipation section and the rotating section are located on opposite sides of the mounting section. The second jet piezoelectric fan is used to face the screen of the mobile terminal.

12. An electronic device, characterized in that, include: A mobile terminal having a heating surface; The heat dissipation module as described in any one of claims 1-11, wherein the jet outlet of the heat dissipation module is directed toward the heat-generating surface of the mobile terminal.

13. The electronic device as claimed in claim 12, characterized in that, When the heat dissipation module is in the open state, the distance between the jet outlet of the first jet piezoelectric fan and the heat-generating surface is greater than or equal to 2 mm.

14. The electronic device as claimed in claim 12, characterized in that, The mobile terminal includes a mobile phone, the mobile phone includes a back cover, the back cover includes the heat-generating surface, and the heat dissipation module is mounted on the heat-generating surface of the back cover.

15. The electronic device as claimed in claim 12, characterized in that, The mobile terminal includes a mobile phone, the mobile phone includes a screen and a mid-frame, the screen includes the heat-generating surface, and the additional heat dissipation part of the heat dissipation module is mounted on the mid-frame and faces the screen.

16. The electronic device as claimed in claim 12, characterized in that, The mobile terminal includes a watch, which includes a dial and a connecting part. One end of the dial is rotatably connected to the connecting part. The dial includes the heating surface, and the heat dissipation module is installed on the connecting part.

17. A mobile terminal, characterized in that, include: Rear cover, the rear cover having a heating surface; A rotating part, which is rotatably connected to the rear cover; A jet piezoelectric fan is provided on the rotating part. The jet piezoelectric fan includes a jet port, which is disposed facing the heating surface of the rear cover. The jet port is used for fluid inlet / outlet.

18. The mobile terminal as described in claim 17, characterized in that, When the rotating part is in the open state, the distance between the jet outlet of the jet piezoelectric fan and the heating surface is greater than or equal to 2mm.

19. A mobile terminal, characterized in that, include: The watch strap has a connecting part; The dial has a heating surface, and one end of the dial is rotatably connected to the connecting part; A rotating part, which is rotatably connected to the connecting part; A jet piezoelectric fan is mounted on the rotating part. The jet piezoelectric fan includes a jet port, which is disposed facing the heating surface of the dial. The jet port is used for fluid inlet / outlet.

20. A mobile terminal, characterized in that, include: The watch strap has a connecting part; The dial has a heating surface, and one end of the dial is rotatably connected to the connecting part; A jet piezoelectric fan is mounted on the connecting part. The jet piezoelectric fan includes a jet port, which is disposed facing the heating surface of the dial. The jet port is used for fluid inlet / outlet.

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