TWI848726B - Foldable electronic device - Google Patents

Abstract

A foldable electronic device including a first body, a second body having an air outlet, a heat source, a heat conducting member, a heat dissipating fin, a fan disposed in the first body, and a flexible member is provided. The second body is pivoted to the first body to form a channel. The heat source, the heat conducting member, and the heat dissipating fin are respectively disposed in the second body, wherein heat generated by the heat source is transferred to the heat dissipating fin through the heat conducting member. The fan generates an air flow, and the air flow sequentially passes the channel, the heat dissipating fin, and the air outlet to be discharged out of the foldable electronic device. The flexible member is connected between the first body and the second body to form a portion of the channel. The second body is folded and stacked on the first body to fold the flexible member. The second body is unfolded relative to the first body to expand the flexible member.

Description

Folding electronic devices

The present invention relates to a foldable electronic device.

Existing laptops are small and easy to carry, so they are widely used in daily life, work or education. Compared with desktop computers, the internal space of laptops is small, so the heat generated by various electronic components is easily accumulated inside and difficult to dissipate. The high temperature will cause the operating performance of the laptop to decrease, and even cause damage to the central processing unit and graphics chip.

Generally speaking, in order to dissipate heat smoothly, a fan built into the body usually draws in cold air and then makes it contact the heat sink fins for cooling, thereby achieving the purpose of heat dissipation. However, due to the thin structure of laptops, the number and size of air outlets and the area size of heat sink fins are often limited, resulting in a lack of heat convection space inside the body, which is not conducive to the intake of cold air and the discharge of hot air. Therefore, overheating problems will still occur during long-term use or high-intensity operation.

The present invention provides a foldable electronic device, which is pivotally connected to different bodies through a second body, and is equipped with correspondingly arranged heat sources, heat dissipation components and fans, so that the device can provide an effective heat dissipation path and heat dissipation space whether the body is folded or unfolded.

The foldable electronic device of the present invention includes a first body, a second body, a heat source, a heat conductive element, a heat sink fin, a fan and a flexible element. The second body is hinged to the first body to form a channel. The second body has an air outlet. The heat source, the heat conductive element and the heat sink fin are respectively arranged in the second body. The heat generated by the heat source is transferred to the heat sink fin via the heat conductive element. The fan is arranged in the first body. The fan generates airflow and passes through the channel, the heat sink fin and the air outlet in sequence to be discharged from the foldable electronic device. The flexible element connects the second body and the first body and forms a part of the channel. The second body is closed and overlapped on the first body to fold the flexible element, and the second body is unfolded relative to the first body to unfold the flexible element.

Based on the above, the foldable electronic device is a second body pivotally connected to the first body to form a channel. Furthermore, the heat source, the heat conducting element and the heat dissipating fin are arranged in the second body, and the fan is arranged in the first body and corresponds to the aforementioned channel.

In this way, the fan and the heat source are actually two separate components (the first body and the second body), so the fan can effectively absorb cold air without worrying about the heat source affecting the airflow or ambient temperature. Furthermore, after the heat source in the second body transfers heat to the heat sink fins through the heat conductive element, no matter whether the device is in a folded state or an unfolded state, the airflow generated by the fan can be transferred into the second body through the channel, and after heat conversion (heat dissipation) on the heat sink fins, the airflow is further discharged from the foldable electronic device through the air outlet of the second body.

Accordingly, the cold air drawn by the fan from the first body can continuously provide a heat dissipation effect to the second body where the heat source is located, thereby improving the heat dissipation capacity of the foldable electronic device.

FIG. 1 is a schematic diagram of a foldable electronic device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the foldable electronic device of FIG. 1 in another state. FIG. 3 is an exploded view of some components of the foldable electronic device of FIG. 2. Please refer to FIG. 1 to FIG. 3 simultaneously. In this embodiment, the foldable electronic device 100, such as a notebook computer, includes a first body 110, a second body 130, a heat source 150, a heat conductor 160, a heat sink fin 170, and a third body 120. The second body 130 is connected to the first body 110 and the third body 120 to form a foldable/expandable three-component body, and can be switched between at least a folded state as shown in FIG. 1 and an unfolded state as shown in FIG. 2. Furthermore, the second body 130 has an air outlet 132a. The heat source 150 (including the CPU and GPU), the heat conductor 160 (such as a heat pipe) and the heat sink 170 are respectively disposed in the second body 130, and one end of the heat conductor 160 is in thermal contact with the heat source 150, and the other end is in thermal contact with the heat sink 170. The heat generated by the heat source 150 is transferred to the heat sink 170 via the heat conductor 160. In this embodiment, the foldable electronic device 100 further includes a keyboard module KB and a display module MO, wherein the keyboard module KB is disposed in the first body 110, and the display module MO is disposed in the third body 120.

FIG. 4 is a partial cross-sectional view of the foldable electronic device of FIG. 1 . FIG. 5 is a partial cross-sectional view of the foldable electronic device of FIG. 2 . Please refer to FIG. 2 , FIG. 4 and FIG. 5 simultaneously. In this embodiment, the second body 130 and the first body 110 form a channel CH, and the foldable electronic device 100 further includes a fan 140, which is disposed in the first body 110 and corresponds to the channel CH. Accordingly, the fan 140 generates airflow and passes through the channel CH, the heat dissipation fins 170 and the air outlet 132a in sequence and is discharged from the foldable electronic device 100. Here, in terms of the direction of the airflow, the channel CH starts at the air outlet of the fan 140 and ends at the air outlet 132a of the second body 130.

In addition, please refer to FIG. 2 and FIG. 3 again. The second body 130 of the present embodiment includes a front plate 131, a rear plate 132 and a grille structure 133. The front plate 131 and the rear plate 132 are combined together to accommodate the heat source 150, the heat conducting element 160, the heat sink fin 170 and the grille structure 133. The grille structure 133 is further adjacent to the air outlet 132a of the rear plate 132 to provide protection for the components inside the second body 130. In other words, the main system components of the foldable electronic device 100 are arranged in the second body 130. Therefore, the second body 130 of the present embodiment can be regarded as a system host of a laptop computer.

In another embodiment not shown, the grille structure 133 may be omitted from the second body 130 , so that the heat dissipation fins 170 are exposed through the air outlet 132 a of the second body 130 , so as to improve the heat dissipation efficiency.

FIG6 shows a part of the foldable electronic device of FIG2 from another perspective. FIG7 is a schematic diagram of the combination of some components of FIG6. Please refer to FIG6 and FIG7 at the same time. In this embodiment, the foldable electronic device 100 further includes a flexible component B7 and a plurality of geometric plates B1-B6, wherein the flexible component B7 connects the second body 130 and the first body 110 and forms the inner wall of the channel CH. When the second body 130 is closed and overlapped on the first body 110, as shown in FIG4, the flexible component B7 can be folded, and when the second body 130 is unfolded relative to the first body 110, as shown in FIG5, the flexible component B7 can be unfolded. In this embodiment, as shown in FIG. 7 , the flexible component B7 and the geometric panels B1 to B6 can be made of flexible materials such as cloth, glass fiber, rubber, resin, etc., respectively, wherein the geometric panels B1 to B6 are used to increase the thickness of the overall structure, so that after the geometric panels B1 to B6 are arranged on the flexible component B7, a retractable and foldable scaffold and scaffolding cloth like origami is formed to form a folding plate structure, which is folded or unfolded according to the corresponding state of the second body 130 relative to the first body 110. In other embodiments, the geometric plates B1-B6 may also be other thin sheets with higher hardness (such as plastic) attached to the flexible member B7 to enhance the structural strength of the flexible member B7 to meet the needs of opening (folding/expanding). In this embodiment, the hardness or thickness of the geometric plates B1-B6 is greater than the hardness or thickness of the flexible member B7. In addition, as shown in FIG. 7 , among the geometric panels B1 to B6, the geometric panels B1 and B2 are trapezoidal panels, wherein the geometric panel B1 is adjacent to the second body 130, and the geometric panel B2 is adjacent to the first body 110, while the geometric panels B3 to B6 are triangular panels, and the geometric panels B3 and B4 are adjacent to and surrounded by the geometric panels B1, B2 and the third body 120 and the first body 110, and the geometric panels B5 and B6 are adjacent to and surrounded by the geometric panels B1, B2 and the third body 120 and the first body 110.

Please refer to FIG. 4 again. When the foldable electronic device 100 is in the folded state, the flexible member B7 and the geometric plates B1-B6 are folded between the second body 130 and the first body 110, and thus form the inner wall of the channel CH. Furthermore, the foldable electronic device 100 further includes a heat conductive sheet G1, which is flexible and extends from the first body 110 to the second body 130. The material of the heat conductive sheet G1 has both flexibility and good thermal conductivity, such as a copper sheet or a graphite sheet.

Specifically, the heat conducting sheet G1 is disposed in the channel CH and forms another inner wall of the channel CH to be opposite to the aforementioned flexible component B7 and the geometrical plates B1 to B6. Here, one side of the heat conducting sheet G1 is connected to the fan 140, and the other end of the heat conducting sheet G1 is connected to the heat sink 170. In the channel CH shown in FIG. 4 , the aforementioned flexible component B7, the geometrical plates B1 to B6 and the heat conducting sheet G1 form a pair of inner protrusions T2 and T1 opposite to each other, wherein the inner protrusion T2 is substantially located at the folded portion of the geometrical plates B1 and B2 (and at the connection between the first body 110 and the second body 130), and the inner protrusion T1 is substantially located at the connection between the heat conducting sheet G1 passing through the first body 110 and the second body 130.

Thus, for the channel CH, the airflow blown out from the fan 140 will flow along the surfaces of the inner protrusions T1 and T2, that is, a "Coandă Effect" is generated. This is beneficial to provide a guiding effect for the airflow, so that the airflow can smoothly move through the channel CH and be transmitted from the first body 110 to the second body 130.

When the second body 130 is unfolded relative to the first body 110, as shown in FIG5 , the flexible member B7 and the geometric plates B1 to B6 are also unfolded, but the inner convex portions T1 and T2 facing each other in the channel CH still exist, so the airflow still flows along the surface of the inner convex portions T1 and T2, and can be smoothly transferred from the first body 110 to the second body 130 until the heat dissipation fins 170 are dissipated and then discharged from the foldable electronic device 100 through the air outlet 132a. Here, the unfolded flexible member B7 and the geometric plates B1 to B6 are like the flap structure of an airplane, allowing the airflow to flow smoothly along the unfolded inner surface.

Here, the rectangular coordinates X-Y-Z are provided as a reference, and by comparing FIG. 4 and FIG. 5 , it can be seen that when the second body 130 is closed in the first body 110, the channel CH has a first cross-sectional area A1 at the inner convex parts T1 and T2, and the first cross-sectional area A1 is smaller than the third cross-sectional area A3 of the heat sink fin 170 and smaller than the fourth cross-sectional area A4 of the air outlet 132a. In contrast, when the second body 130 is unfolded relative to the first body 110 as shown in FIG. 5 , the channel CH has a second cross-sectional area A2 at the inner convex parts T1 and T2, and the aforementioned first cross-sectional area A1 is smaller than the second cross-sectional area A2. In other words, even if the flexible member B7 and the geometric plates B1 to B6 are unfolded along with the body, they can still drive the airflow to be stably transmitted toward the second body 130, and because the cross-sectional area increases (from the first cross-sectional area A1 in FIG. 4 to the second cross-sectional area A2 in FIG. 5), the air volume in the channel CH is increased to increase the heat dissipation effect on the heat dissipation fin 170. In addition, regardless of FIG. 4 or FIG. 5, the upper inner wall and the lower inner wall of the channel CH form inner convex portions T1 and T2 respectively, and the inner convex portions T1 and T2 are opposite to each other to form a necking structure to provide a pressurization effect on the airflow. Here, the airflow direction is used as a reference. As shown in Figure 4 or 5, the airflow blown out from the fan 140 flows in the channel CH in the first body 110, the upper side of the airflow is regarded as the upper inner wall of the channel CH, and the lower side of the airflow is regarded as the lower inner wall of the channel CH, and thus extends to the second body 130.

In another embodiment not shown, the upper inner wall of the channel CH may only use the flexible member B7 without the geometric plates B1 to B6, which can also achieve the folding and unfolding effects shown in Figures 4 and 5, and also form an inner convex portion to guide the airflow. In addition, in the closed state shown in Figure 4, the first cross-sectional area A1, the third cross-sectional area A3, and the fourth cross-sectional area A4 are substantially parallel to the X-Y plane of the rectangular coordinate X-Y-Z.

FIG8A and FIG8B are partial cross-sectional views of foldable electronic devices of different embodiments of the present invention. Please refer to FIG8A first. The difference from the aforementioned embodiment is that the end of the heat conductive element 160A in thermal contact with the heat sink fin 170A in this embodiment is substantially embedded in the center of the heat sink fin 170A. In addition, please refer to FIG8B. The difference from the aforementioned embodiment is that the end of the heat conductive element 160B in thermal contact with the heat sink fin 170B in this embodiment is located between the heat sink fin 170B (the side edge) and the heat conductive sheet G1, that is, the other end of the heat conductive sheet G1 is connected to the heat conductive element 160B, so that the end of the heat conductive element 160B in contact with the heat sink fin 170B is close to the other inner wall of the channel CH. In addition, other components that are the same as those in the above-mentioned embodiment will not be described in detail.

FIG. 9A to FIG. 13B are partial cross-sectional views of the foldable electronic device of different embodiments of the present invention. It should be noted that in these embodiments, if the related components have been mentioned before, they will not be described in detail. Please refer to FIG. 9A and FIG. 9B first. In this embodiment, the heat conductive sheet G1 is the same as the embodiments of FIG. 4 and FIG. 5 mentioned above. It is used to form the lower wall surface of the channel CH1, and similarly forms an inner convex portion T1 at the junction of the first body 110 and the support member 130 to produce a Coanda effect to guide the airflow. In addition, for the channel CH1, its upper inner wall is formed by combining the local structure of the first body 110 and the local structure of the second body 130, so most of the airflow at this time will follow the inner convex portion T1 as its flow. In this embodiment, the heat conductive sheet G1 can be regarded as the flexible component B7 of the aforementioned embodiment.

Please refer to FIG. 10A and FIG. 10B . The flexible member B7 and the geometric plates B1 to B6 (and the inner convex portion T2 formed thereon) are the same as those in the aforementioned embodiments, but the difference is that the lower inner wall of the channel CH2 is formed by combining the local structure of the first body 110 and the local structure of the second body 130. Since the inner convex portion T3 can still be formed at the junction of the first body 110 and the second body 130, the Coanda effect can also be generated so that part of the airflow can flow along the surface of the inner convex portion T3.

Please refer to FIG. 11A and FIG. 11B . In this embodiment, a pair of heat conducting sheets G1 and G2 are used to form the lower inner wall and the upper inner wall of the channel CH3 respectively. The heat conducting sheet G1 is as described above and will not be described in detail. The heat conducting sheet G2 is similar to the flexible component B7 and the geometrical plates B1 to B6. It can be folded or unfolded along with the first body 110 and the second body 130, so it can also form the inner convex portion T4 of the channel CH3, so that the airflow can flow along the surface of the inner convex portion T4. Here, the heat conducting sheets G1 and G2 can be made of the same material.

Please refer to Figures 12A and 12B. The upper inner wall of the channel CH4 is formed by the heat conductive sheet G2, so the inner convex portion T2 is formed as shown in Figures 11A and 11B above, and the lower inner wall of the channel CH4 is formed as the inner convex portion T3 as shown in Figures 10A and 10B. It is formed by combining the local structure of the first body 110 and the local structure of the second body 130. Therefore, the relevant description and effects of this embodiment are as described above.

Please refer to FIG. 13A and FIG. 13B , the lower inner wall of the channel CH5 shown in FIG. 12A , FIG. 12B or FIG. 10A , FIG. 10B is formed by combining the partial structure of the first body 110 and the partial structure of the second body 130. The difference between this embodiment and the above-mentioned embodiment is that the upper inner wall of the channel CH5 is formed by the flexible component B7 , the geometric plates B1 to B6 and the heat conductive sheet G2 , and the heat conductive sheet G2 can be folded or unfolded with the flexible component B7 and the geometric plates B1 to B6 in response to the relative movement of the first body 110 and the second body 130 , and can also form the inner convex portion T5 . Accordingly, the airflow of the channel CH5 of this embodiment can smoothly flow along the surface of the inner convex portion T3 and the inner convex portion T5 .

In summary, in the above-mentioned embodiment of the present invention, the foldable electronic device is a three-component hinged folding structure formed by the second body being hinged between the first body and the third body, wherein the second body and the first body also form a channel. Furthermore, the heat source, the heat conducting element and the heat dissipating fin are disposed in the second body, and the fan is disposed in the first body and corresponds to the aforementioned channel.

In this way, the fan and the heat source are actually two separate components (the first body and the second body), so the fan can effectively absorb cold air without worrying about the heat source affecting the airflow or ambient temperature. Furthermore, after the heat source in the second body transfers heat to the heat sink fins through the heat conductive element, no matter whether the device is in a folded state or an unfolded state, the airflow generated by the fan can be transferred into the second body through the channel, and after heat conversion (heat dissipation) on the heat sink fins, the airflow is further discharged from the foldable electronic device through the air outlet of the second body.

In the above embodiments of the present invention, the channel can be formed by using, in addition to the local structure of the first body and the local structure of the second body, a foldable/expandable flexible member, a folding plate structure formed by a flexible member and a geometric plate, a thermal conductive sheet with good flexibility and heat conductivity, or a combination of the above components.

Accordingly, the cold air drawn by the fan from the first body can continuously provide a heat dissipation effect to the second body where the heat source is located, thereby improving the heat dissipation capacity of the foldable electronic device.

100: Foldable electronic device 110: First body 120: Third body 130: Second body 131: Front panel 132: Back panel 132a: Air outlet 133: Grid structure 140: Fan 150: Heat source 160, 160A, 160B: Heat conducting element 170, 170A, 170B: Heat dissipating fin A1: First cross-sectional area A2: Second cross-sectional area A3: Third cross-sectional area A4: Fourth cross-sectional area B1, B2, B3, B4, B5, B6: Geometric plate B7: Flexible element CH, CH1, CH2, CH3, CH4, CH5: Channel G1, G2: Heat conducting sheet KB: keyboard module MO: display module T1, T2, T3, T4, T5: inner convex part X-Y-Z: rectangular coordinates

FIG. 1 is a schematic diagram of a foldable electronic device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the foldable electronic device of FIG. 1 in another state. FIG. 3 is an exploded view of some components of the foldable electronic device of FIG. 2. FIG. 4 is a partial cross-sectional view of the foldable electronic device of FIG. 1. FIG. 5 is a partial cross-sectional view of the foldable electronic device of FIG. 2. FIG. 6 shows a part of the foldable electronic device of FIG. 2 from another perspective. FIG. 7 is a schematic diagram of the combination of some components of FIG. 6. FIG. 8A and FIG. 8B are partial cross-sectional views of foldable electronic devices of different embodiments of the present invention, respectively. FIG. 9A to FIG. 13B are partial cross-sectional views of foldable electronic devices of different embodiments of the present invention.

100: Foldable electronic devices

110: First Body

120: The third body

130: Second body

132a: Air outlet

133: Grid structure

150: Heat source

160: Heat conducting parts

170: Heat sink fins

KB: Keyboard module

MO: Display module

Claims (21)

A foldable electronic device includes: a first body; a second body, which is connected to the first body to form a channel, and the second body has an air outlet; a heat source, a heat conductor and a heat sink fin, which are respectively arranged in the second body, and the heat source generates heat and transmits it to the heat sink fin through the heat conductor; a fan, which is arranged in the first body, and the fan generates airflow and passes through the channel, the heat sink fin and the air outlet in sequence to discharge the foldable electronic device; and a flexible part, which connects the second body and the first body and forms a part of the inner wall of the channel, the second body is closed and overlapped on the first body to fold the flexible part, and the second body is unfolded relative to the first body to unfold the flexible part. A foldable electronic device as described in claim 1, wherein a portion of the heat sink fin is exposed by the air outlet of the second body. A foldable electronic device as described in claim 1, wherein the heat conductive element is a heat pipe, one end of the heat pipe is connected to the heat source, and the other end of the heat pipe is connected to the heat sink. A foldable electronic device as described in claim 3, wherein the other end of the heat pipe is connected to the side edge of the heat sink fin and is close to the inner wall. A foldable electronic device as described in claim 3, wherein the other end of the heat pipe is embedded in the center of the heat sink fin. The foldable electronic device as described in claim 1 further includes a plurality of geometric plates attached to the flexible member to form a foldable plate structure with the flexible member. A foldable electronic device as described in claim 6, wherein the adjacent parts of the geometric plates form an inner convex part of the channel to produce a Coandă Effect and guide the airflow generated by the fan to the second body. The foldable electronic device as described in claim 6 also includes a heat conductive sheet attached to the surface of the flexible member facing away from the geometric plates to form an inner wall of the channel. In the foldable electronic device as described in claim 1, the flexible component is a heat conductive sheet extending from the first body to the second body and forming an inner wall of the channel. A foldable electronic device as described in claim 9, wherein one side of the heat conductive sheet is connected to the fan, and the other end of the heat conductive sheet is connected to the heat sink or the heat conductive element. A foldable electronic device as described in claim 9, wherein the heat conductive sheet forms an inner convex portion of the channel between the first body and the second body to generate a Coandă Effect and guide the airflow generated by the fan to the second body. A foldable electronic device as described in claim 1, wherein a local structure of the first body is combined with a local structure of the second body to form at least one inner wall of the channel. A foldable electronic device as described in claim 1, wherein the channel has an upper inner wall and a lower inner wall opposite to each other, the upper inner wall is selected from the flexible member, a folding plate structure, a partial structure of the first body and a partial structure of the second body, a heat conductive sheet, and a combination of the folding plate structure and the heat conductive sheet, and the lower inner wall is selected from the heat conductive sheet and another partial structure of the first body and another partial structure of the second body. A foldable electronic device as described in claim 13, wherein the upper inner wall and the lower inner wall each have an inner convex portion to produce a Coandă Effect and guide the airflow generated by the fan to the second body. A foldable electronic device as described in claim 14, wherein when the second body is closed in the first body, the channel has a first cross-sectional area at the pair of inner protrusions, and when the second body is unfolded in the first body, the channel has a second cross-sectional area at the pair of inner protrusions, and the second cross-sectional area is larger than the first cross-sectional area. As described in claim 14, in the foldable electronic device, when the second body is closed in the first body, the channel has a first cross-sectional area at the inner convex portion, and the first cross-sectional area is smaller than a third cross-sectional area of the heat sink fin and also smaller than a fourth cross-sectional area of the air outlet. The foldable electronic device as described in claim 1 also includes a third body pivotally connected to the second body. The foldable electronic device as described in claim 17 further includes a keyboard module and a display module, wherein the keyboard module is configured on the first body and the display module is configured on the third body. A foldable electronic device includes: a first body; a second body, connected to the first body to form a channel, the second body having an air outlet; a heat source, a heat conductive element and a heat sink, respectively arranged in the second body, the heat source generates heat which is transferred to the heat sink via the heat conductive element; a fan, arranged in the first body, the fan generates airflow and passes through the channel in sequence , the heat dissipation fin and the air outlet to discharge the foldable electronic device; and a flexible part, connecting the second body and the first body and forming a part of the channel, the second body is closed and overlapped on the first body to fold the flexible part, the second body is unfolded relative to the first body to unfold the flexible part, wherein the flexible part forms an inner convex part in the channel to generate a Coandă Effect and guide the airflow generated by the fan to the second body. A foldable electronic device comprises: a first body; a second body, connected to the first body to form a channel, the second body having an air outlet; a heat source, a heat conductive element and a heat sink fin, respectively arranged in the second body, the heat source generates heat which is transferred to the heat sink fin via the heat conductive element; a fan, arranged in the first body, the fan generates airflow and passes through the channel, the heat sink fin and the air outlet in sequence to The foldable electronic device is discharged; and a flexible part is connected to the second body and the first body and forms a part of the channel. The second body is closed and overlapped on the first body to fold the flexible part. The second body is unfolded relative to the first body to unfold the flexible part. The local structure of the first body is combined with the local structure of the second body to form at least one inner convex part of the channel to generate a Coandă Effect and guide the airflow generated by the fan to the second body. A foldable electronic device includes: a first body; a second body, which is connected to the first body to form a channel, and the second body has an air outlet; a heat source, a heat conductor and a heat sink fin, which are respectively arranged in the second body, and the heat source generates heat and transmits it to the heat sink fin through the heat conductor; a fan, which is arranged in the first body, and the fan generates airflow and passes through the channel, the heat sink fin and the air outlet in sequence to discharge the foldable electronic device; and a flexible part, which connects the second body and the first body and forms a part of the channel, the second body is closed and overlapped on the first body to fold the flexible part, and the second body is unfolded relative to the first body to unfold the flexible part, wherein the air outlet has a grid structure.