Heat dissipation module and electronic equipment

Abstract

The invention discloses a heat dissipation module and electronic equipment, the heat dissipation module comprises a module shell and a heat dissipation fan, an air passing channel is defined by the module shell, the heat dissipation fan comprises fan blades and an electromagnetic driving device, and the fan blades comprise permanent magnet parts. In order to prevent water from intruding into the air passing channel to damage the cooling fan, fan blades of the cooling fan can be arranged in the air passing channel, the fan blades are rotationally connected with the module shell, the electromagnetic driving device is arranged outside the air passing channel, and when the electromagnetic driving device is in a power-on state, the electromagnetic driving device is magnetically matched with the permanent magnet piece to drive the fan blades to rotate, so that the cooling fan is driven to rotate. And the air flow is driven to flow in the air passing channel, so that rapid heat dissipation can be realized. Due to the fact that a power source for rotation of the fan blades comes from the electromagnetic driving device outside the air passing channel, the fan blades do not need to be powered on, even if water enters the air passing channel to enable the fan blades to be in a wading environment, normal operation of the cooling fan cannot be affected, and the service life of the cooling module and the service life of the electronic equipment are prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of communication equipment, and in particular to a heat dissipation module and electronic equipment. Background Art

[0002] With the rapid development of electronic devices, people's performance requirements for electronic devices are also increasing. The heat dissipation performance of electronic devices directly affects important parameters such as the operating speed and stability of electronic devices. In related technologies, in order to improve the heat dissipation performance of electronic devices, active heat dissipation is set on the electronic devices, such as a heat dissipation fan. The heat dissipation fan can quickly transfer the heat generated by the electronic devices to the external environment through the heat dissipation duct.

[0003] For the above solution, when the electronic device is used in a water-related environment, water can easily penetrate into the heat dissipation duct and damage the heat dissipation fan in the heat dissipation duct, thereby having a significant impact on the service life of the entire device. Summary of the invention

[0004] The present application discloses a heat dissipation module and an electronic device to solve the problem in the related art that water easily intrudes into a heat dissipation air duct and causes damage to a heat dissipation fan in the heat dissipation air duct.

[0005] In order to solve the above technical problems, this application is implemented as follows: In a first aspect, an embodiment of the present application discloses a heat dissipation module, the heat dissipation module disclosed comprises a module housing and a heat dissipation fan, the heat dissipation fan comprises a fan blade and an electromagnetic drive device, the fan blade comprises a permanent magnet, the module housing encloses an air passage, the fan blade is located in the air passage, and is rotatably connected to the module housing; The electromagnetic driving device is arranged outside the air passage. When the electromagnetic driving device is in a powered-on state, the electromagnetic driving device magnetically cooperates with the permanent magnet component to drive the fan blades to rotate.

[0006] In a second aspect, an embodiment of the present application discloses an electronic device, the disclosed electronic device includes a device housing, the electronic device includes the above-mentioned heat dissipation module, wherein: The module housing is installed in the device housing and forms a device inner cavity with the device housing. The device inner cavity is sealed and isolated from the air passage. The electromagnetic drive device is arranged in the device inner cavity; or, The device housing includes the module housing, the device housing has a device inner cavity, and the electromagnetic driving device is arranged in the device inner cavity.

[0007] The technical solution adopted in this application can achieve the following technical effects: The heat dissipation module disclosed in the embodiment of the present application improves the related art. The disclosed heat dissipation module includes a module housing and a heat dissipation fan. The module housing forms an air passage. The heat dissipation fan includes a fan blade and an electromagnetic drive device. The fan blade includes a permanent magnet. In order to prevent water from invading the air passage and damaging the heat dissipation fan, the fan blade of the heat dissipation fan can be arranged in the air passage, and the fan blade is rotatably connected to the module housing. The electromagnetic drive device is arranged outside the air passage. When the electromagnetic drive device is in a powered-on state, the electromagnetic drive device and the permanent magnet magnetically cooperate to drive the fan blade to rotate, so as to drive the air flow to flow in the air passage, thereby realizing rapid heat dissipation. Since the power source for the rotation of the fan blade comes from the electromagnetic drive device outside the air passage, the fan blade itself does not need to be powered on. Even if the air passage is flooded and the fan blade is in a wading environment, it will not affect the normal operation of the heat dissipation fan, thereby improving the service life of the heat dissipation module and the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is one of the exploded views of the heat dissipation fan disclosed in the embodiment of the present application; Figure 2 This is the second exploded view of the heat dissipation fan disclosed in the embodiment of the present application; Figure 3 A schematic cross-sectional structure diagram of a heat dissipation fan disclosed in an embodiment of the present application; Figure 4 This is the third exploded view of the heat dissipation fan disclosed in the embodiment of the present application.

[0009] Description of reference numerals: 110-module shell, 111-wind passage, 112-blind hole, 113-first subshell, 114-second subshell, 115-air inlet, 116-air outlet, 120-fan blade, 121-permanent magnet, 122-fan blade body, 123-rotating shaft, 130-electromagnetic drive device, 131-circuit board, 132-electromagnetic coil, 140-mounting bracket, 141-peripheral support part, 142-sleeve. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0011] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or a sequential order. It should be understood that the data used in this way can be interchangeable in appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally a class, and the number of objects is not limited, for example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the front and back associated objects are a kind of "or" relationship.

[0012] The technical solutions disclosed in various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0013] Please refer to Figures 1 to 4 The embodiment of the present application discloses a heat dissipation module. The disclosed heat dissipation module may include a module shell 110 and a heat dissipation fan. The module shell 110 is the installation base of the entire heat dissipation module. The module shell 110 surrounds an air passage 111. The air passage 111 can be arranged close to the heat-generating component. The air passage 111 is provided with an air inlet 115 and an air outlet 116 connected to the outside world. The external gas can enter the air passage 111 through the air inlet 115, and after heat exchange in the air passage 111, it is discharged through the air outlet 116. The power required for the gas to flow in the air passage 111 can be provided by the heat dissipation fan.

[0014] Considering that the air passage 111 is connected to the outside, water will inevitably intrude into the air passage 111 in a water-crossing environment. To prevent the cooling fan in the air passage 111 from being short-circuited or damaged due to water-crossing, the cooling fan may be designed as follows: The cooling fan may include a fan blade 120 and an electromagnetic drive device 130. The fan blade 120 includes a permanent magnet 121. The permanent magnet 121 may be a neodymium iron boron magnet, a cobalt magnet, etc. The electromagnetic drive device 130 may be connected to a power supply device. When the electromagnetic drive device 130 is powered on, the electromagnetic drive device 130 and the permanent magnet 121 are magnetically matched to drive the fan blade 120 to rotate. Based on the above-mentioned driving method, since the electromagnetic drive device 130 and the permanent magnet 121 can be in a non-contact transmission matching relationship during the magnetic matching process, the fan blade 120 can be set in the air passage 111, and the electromagnetic drive device 130 can be set outside the air passage 111. The fan blade 120 and the electromagnetic drive device 130 are separated by the module housing 110.

[0015] like Figure 3As shown in the dotted area, this area is the wading area of ​​the air passage 111, and the fan blades 120 can be arranged in this area. Since the fan blades 120 do not need to be powered on, even if water enters the air passage 111 and the fan blades 120 are in a wading environment, it will not cause the problem of short circuit and damage to the cooling fan. In order to allow the fan blades 120 to rotate stably in the air passage 111, the fan blades 120 can be rotatably connected to the module housing 110, and the fan blades 120 can be connected to the inner wall of the module housing 110 through a rotating shaft 123. The fan blades 120 as a whole can be made of permanent magnetic material. Considering factors such as the production cost and the weight of the fan blades 120, the permanent magnets 121 can be set only on parts of the fan blades 120, and the other parts of the fan blades 120 can be made of non-magnetic materials such as plastic.

[0016] Regarding the waterproofing problem of the electromagnetic drive device 130, combined with the specific usage scenario, the heat dissipation module can be set in the device cavity of the electronic device and close to the heat-generating components of the electronic device. The electromagnetic drive device 130 can be set in the device cavity of the electronic device. In order to protect various components in the device cavity, the electronic device itself will adopt a higher level of waterproofing design, so setting the electromagnetic drive device 130 in the device cavity can also achieve a higher level of waterproofing; alternatively, a special waterproof cover can be designed for the electromagnetic drive device 130 to improve the waterproofing level of the electromagnetic drive device 130.

[0017] As described above, it can be known that the heat dissipation module disclosed in the embodiment of the present application improves the related art. The disclosed heat dissipation module includes a module housing 110 and a heat dissipation fan. The module housing 110 forms an air passage 111. The heat dissipation fan includes a fan blade 120 and an electromagnetic drive device 130. The fan blade 120 includes a permanent magnet 121. In order to prevent water from invading the air passage 111 and causing damage to the heat dissipation fan, the fan blade 120 of the heat dissipation fan can be arranged in the air passage 111. The fan blade 120 is rotatably connected to the module housing 110. The electromagnetic drive device 130 is arranged outside the air passage 111. When the electromagnetic drive device 130 is in a powered-on state, the electromagnetic drive device 130 and the permanent magnet 121 are magnetically matched to drive the fan blade 120 to rotate, so as to drive the airflow to flow in the air passage 111, thereby achieving rapid heat dissipation. Since the power source for the rotation of the fan blades 120 comes from the electromagnetic drive device 130 outside the air passage 111, the fan blades 120 themselves do not need to be powered. Even if water enters the air passage 111 and the fan blades 120 are in a water environment, it will not affect the normal operation of the cooling fan, thereby improving the service life of the cooling module and the electronic equipment.

[0018] like Figure 1 and Figure 3As shown, the heat dissipation module may further include a mounting bracket 140, which may support and fix the module housing 110 and the heat dissipation fan. Specifically, the mounting bracket 140 may include a sleeve 142, which includes a first end and a second end opposite to each other, the first end of the sleeve 142 being a closed end, and the second end of the sleeve 142 being an open end. The module housing 110 is provided with a through hole, the open end of the sleeve 142 may pass through the through hole and extend into the air passage 111, the fan blade 120 may include a rotating shaft 123 and blades, the blades are arranged around the circumference of the rotating shaft 123, the rotating shaft 123 of the fan blade 120 may extend into the sleeve 142 through the open end of the sleeve 142, and rotate in cooperation with the sleeve 142. Under the limiting action of the sleeve 142, the fan blade 120 may stably rotate in the air passage 111.

[0019] In order to prevent the water in the air passage 111 from flowing out through the gap between the shaft sleeve 142 and the through hole, the shaft sleeve 142 and the through hole can be sealed during the actual assembly. Specifically, the sealing can be achieved by bonding with a sealant or by hot melting. The first end of the shaft sleeve 142 adopts a closed design, which can also prevent the water in the air passage 111 from flowing out through the shaft sleeve 142, thereby preventing the water from further invading the electromagnetic drive device 130, thereby protecting the electromagnetic drive device 130. In addition, in order to reduce the friction between the rotating shaft 123 and the shaft sleeve 142, a bearing can be provided between the rotating shaft 123 and the shaft sleeve 142.

[0020] In the usage scenario where the heat dissipation module is used to dissipate heat for electronic equipment, the heat dissipation module can be integrated on the device housing of the electronic equipment, that is, the module housing 110 of the heat dissipation module is actually a part of the device housing, and the above-mentioned module housing 110 and air passage 111 can be formed on the device housing by injection molding; alternatively, the heat dissipation module and the device housing of the electronic equipment are independent of each other, and the module housing 110 of the heat dissipation module needs to be connected to the device housing by bonding, welding, etc.

[0021] Taking the latter as an example, Figure 1 and Figure 3 As shown, the first end of the sleeve 142 can be used to connect with the device housing of the electronic device. In addition, the mounting bracket 140 can also include a peripheral support portion 141. The peripheral support portion 141 can be an annular structure and is arranged around the sleeve 142. The peripheral support portion 141 is connected to the sleeve 142. The specific connection method can be bonding, hot-melt connection, etc., or the peripheral support portion 141 and the sleeve 142 can also be made in an integral molding manner. The peripheral support portion 141 is also used to connect with the device housing of the electronic device. With the above-mentioned sleeve 142, the combination of the two can increase the contact support area between the module housing 110 and the device housing, thereby improving the stability of the heat dissipation module assembly.

[0022] In the use scenario where the heat dissipation module is used to dissipate heat for electronic equipment, the electromagnetic drive device 130 can be arranged on the device housing of the electronic equipment. Of course, in order to improve the modularity of the heat dissipation module, the electromagnetic drive device 130 can be fixed by using the peripheral support part 141 and the module housing 110. Specifically, an installation gap is formed between the peripheral support part 141 and the module housing 110, and the electromagnetic drive device 130 is at least partially arranged in the installation gap. The electromagnetic drive device 130 can be clamped and fixed by using the module housing 110 and the peripheral support part 141. In this case, the peripheral support part 141 can play multiple functions.

[0023] like Figures 1 to 3 As shown, the electromagnetic drive device 130 may include a circuit board 131 and at least two electromagnetic coils 132. The circuit board 131 may be a PCB (Printed Circuit Board), an FPC (Flexible Printed Circuit board), etc. At least two electromagnetic coils 132 are respectively connected to the circuit board 131. The circuit board 131 can control the current state of the electromagnetic coil 132, such as the current size and current direction, thereby changing the magnetic field of the electromagnetic coil 132 to drive the fan blade 120 to rotate.

[0024] The circuit board 131 is provided with an avoidance hole for the sleeve 142 to pass through, at least two electromagnetic coils 132 are located between the circuit board 131 and the module housing 110, at least two electromagnetic coils 132 are in contact with the module housing 110, and the circuit board 131 is in contact with the peripheral support portion 141, so that the peripheral support portion 141 can be used to clamp and fix the circuit board 131 and the electromagnetic coil 132 to the module housing 110.

[0025] In order to improve the structural strength of the mounting bracket 140, the outer support portion 141 and the shaft sleeve 142 can be connected through an integral molding process, such as an injection molding process, a hot melt process, etc.; at the same time, the outer support portion 141 and the shaft sleeve 142 adopt an integrated design, which is also easy to install and can avoid the cumbersome assembly problem caused by too fragmented parts.

[0026] The shaft sleeve 142 and the through hole need to be sealed, and the shaft sleeve 142 and the hole wall of the through hole can be fixed and sealed by glue, which can improve the connection strength between the shaft sleeve 142 and the through hole and ensure the sealing. In addition, a sealing gasket can be set between the shaft sleeve 142 and the through hole, and the assembly is achieved by interference fit, or the shaft sleeve 142 and the through hole can be assembled by hot melting.

[0027] In an optional embodiment of the present application, Figure 4As shown, a blind hole 112 can be provided on the inner wall of the module housing 110, and the rotating shaft 123 of the fan blade 120 can extend into the blind hole 112 and rotate in cooperation with the blind hole 112. Under the limiting effect of the blind hole 112, the stability of the rotation of the fan blade 120 can be improved. Since the opening of the blind hole 112 will not destroy the sealing of the shell wall of the module housing 110, there is no need to provide a sealing structure on the module housing 110, which can effectively prevent water in the air passage 111 from invading the interior of the electromagnetic drive device 130. In addition, in order to reduce the friction between the rotating shaft 123 and the blind hole 112, a bearing can be provided between the rotating shaft 123 and the blind hole 112.

[0028] like Figures 1 to 4 As shown, the fan blade 120 may also include a fan blade body 122, the permanent magnet 121 is a disc-shaped structural member, the permanent magnet 121 is opposite to the electromagnetic drive device 130, the rotating shaft 123 is connected to the side of the permanent magnet 121 facing the electromagnetic drive device 130, the fan blade body 122 is arranged on the side of the permanent magnet 121 facing away from the rotating shaft 123, the fan blade body 122 is arranged around the circumference of the permanent magnet 121, the rotating shaft 123 and the permanent magnet 121 can be connected by bolt connection, bonding, etc., and the fan blade body 122 and the permanent magnet 121 can be connected by bonding, clamping, etc. The rotating shaft 123 is rotatably matched with the module housing 110, and when the electromagnetic drive device 130 is in the power-on state, the electromagnetic drive device 130 can drive the permanent magnet 121 to drive the fan blade body 122 to rotate.

[0029] like Figures 1 to 4 As shown, to facilitate the installation of the cooling fan, the module shell 110 may include a first sub-shell 113 and a second sub-shell 114. The second sub-shell 114 is covered on the first sub-shell 113. The first sub-shell 113 and the second sub-shell 114 form an air passage 111. The first sub-shell 113 and the second sub-shell 114 can be assembled by bonding, clamping, bolting, etc.

[0030] The first sub-shell 113 is provided with an air inlet 115, and the second sub-shell 114 is provided with an air outlet 116, and the air inlet 115 and the air outlet 116 are connected through the air passage 111. Since the area of ​​the air passage 111 other than the air inlet 115 and the air outlet 116 needs to have good sealing properties to prevent water from invading the electromagnetic drive device 130 from the air passage 111, a sealing gasket can be provided between the first sub-shell 113 and the second sub-shell 114 when the first sub-shell 113 and the second sub-shell 114 are assembled.

[0031] Please refer to Figures 1 to 4, the embodiment of the present application also discloses an electronic device, the disclosed electronic device may be a mobile phone, a tablet computer, an e-book reader, a game console, a wearable device, etc., and the embodiment of the present application does not limit the specific type of the electronic device. The electronic device may specifically include a device housing, which is the main frame of the electronic device. The device housing may be a middle frame, a back cover, etc. of the electronic device. The device housing is provided with a device cavity, and various components are provided in the device cavity. The electronic device may also include the above-mentioned heat dissipation module. The relationship between the module housing 110 of the heat dissipation module and the device housing of the electronic device is as described below: The module housing 110 and the device housing can be independent of each other, and the module housing 110 can be installed in the device housing. The module housing 110 and the device housing can be connected by bonding, welding, etc. The module housing 110 and the device housing enclose an inner cavity of the device, and the inner cavity of the device and the air passage are independent of each other and sealed and isolated. The electromagnetic drive device can be arranged in the inner cavity of the device. Since the inner cavity of the device itself has a high waterproof grade, the waterproof performance of the electromagnetic drive device can be guaranteed.

[0032] Alternatively, the device housing includes a module housing 110, that is, the module housing 110 is actually a part of the device housing, and the module housing 110 and the air passage 111 can be formed on the device housing by integral molding. The device housing also has a device inner cavity, which actually refers to other areas of the device housing except the air passage 111, and the electromagnetic drive device can be arranged in the device inner cavity. Similarly, since the device inner cavity itself has a high waterproof grade, the waterproof performance of the electromagnetic drive device can be guaranteed.

[0033] In addition, the device housing of the electronic device also has a heat-generating component, which may be a main board, a sub-board, a battery, etc. of the electronic device, and the heat dissipation module is disposed close to the heat-generating component of the electronic device.

[0034] When the device housing includes a module housing, the air inlet 115 and the air outlet 116 of the air passage 111 can be formed on the device housing; when the module housing and the device housing are independent of each other, a first ventilation hole and a second ventilation hole can be respectively provided on the device housing, and the air inlet 115 and the air outlet 116 on the module housing 110 can be respectively connected to the first ventilation hole and the second ventilation hole.

[0035] It should be added that a heat-conducting medium may be provided between the heat-dissipating module and the heat-generating components of the electronic device, and the heat-conducting medium may be a heat-conducting adhesive, a heat-conducting metal sheet, etc. In the actual heat-dissipating process, the heat generated by the heat-generating components of the electronic device may be quickly transferred to the module housing 110 through the heat-conducting medium. When the temperature of the module housing 110 rises, the air in the air passage 111 may exchange heat with the module housing 110 and take away the heat. The electromagnetic driving device 130 may drive the fan blades 120 to rotate to realize the air circulation in the air passage 111. The external gas may continuously enter the air passage 111 and be discharged after heat exchange with the module housing 110, thereby realizing the rapid heat dissipation of the electronic device.

[0036] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. Considering the simplicity of the text, they will not be repeated here.

[0037] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A heat dissipation module, characterized in that: It includes a module housing and a cooling fan, wherein the cooling fan includes a fan blade and an electromagnetic drive device, wherein the fan blade includes a permanent magnet, and the module housing encloses an air passage, wherein the fan blade is located in the air passage and is rotatably connected to the module housing; The electromagnetic driving device is arranged outside the air passage. When the electromagnetic driving device is in a powered-on state, the electromagnetic driving device magnetically cooperates with the permanent magnet component to drive the fan blades to rotate.

2. The heat dissipation module according to claim 1, characterized in that: The heat dissipation module also includes a mounting bracket, which includes a shaft sleeve, wherein the first end of the shaft sleeve is a closed end, and the second end of the shaft sleeve is an open end. The module shell is provided with a through hole, and the open end of the shaft sleeve passes through the through hole and extends into the air passage. The rotating shaft of the fan blade extends into the shaft sleeve through the open end and rotates with the shaft sleeve, and the shaft sleeve is sealed with the through hole.

3. The heat dissipation module according to claim 2, characterized in that: The mounting bracket also includes a peripheral support portion, which is disposed around the shaft sleeve and connected to the shaft sleeve.

4. The heat dissipation module according to claim 3, characterized in that: An installation gap is formed between the peripheral support portion and the module shell, and the electromagnetic drive device is at least partially disposed in the installation gap and is clamped and fixed by the module shell and the peripheral support portion.

5. The heat dissipation module according to claim 4, characterized in that: The electromagnetic drive device includes a circuit board and at least two electromagnetic coils, the at least two electromagnetic coils are connected to the circuit board, the circuit board is provided with an avoidance hole for the sleeve to pass through, the at least two electromagnetic coils are located between the circuit board and the module shell, the at least two electromagnetic coils are in contact with the module shell, and the circuit board is in contact with the peripheral support portion.

6. The heat dissipation module according to claim 3, characterized in that: The peripheral support portion is connected to the shaft sleeve through an integral molding process.

7. The heat dissipation module according to claim 2, characterized in that: The shaft sleeve and the hole wall of the through hole are fixed and sealed by glue.

8. The heat dissipation module according to claim 1, characterized in that: The inner wall of the module shell is provided with a blind hole, and the rotating shaft of the fan blade extends into the blind hole and rotates in cooperation with the blind hole.

9. The heat dissipation module according to claim 1, characterized in that: The fan blade also includes a fan blade body, the permanent magnet is a disc-shaped structural part, and is opposite to the electromagnetic drive device, the rotating shaft is connected to the side of the permanent magnet facing the electromagnetic drive device, and the fan blade body is arranged on the side of the permanent magnet facing away from the rotating shaft, the rotating shaft is rotatably matched with the module housing, and when the electromagnetic drive device is in a power-on state, the electromagnetic drive device drives the permanent magnet to drive the fan blade body to rotate.

10. The heat dissipation module according to claim 1, characterized in that: The module housing comprises a first sub-shell and a second sub-shell, wherein the second sub-shell is covered on the first sub-shell and forms the air passage with the first sub-shell; The first subshell is provided with an air inlet, and the second subshell is provided with an air outlet, and the air inlet and the air outlet are communicated with each other through the air passage.

11. An electronic device, characterized in that: The electronic device comprises a device housing, wherein the electronic device comprises a heat dissipation module according to any one of claims 1 to 10, wherein: The module housing is installed in the device housing and forms a device inner cavity with the device housing. The device inner cavity is sealed and isolated from the air passage. The electromagnetic drive device is arranged in the device inner cavity; or, The device housing includes the module housing, the device housing has a device inner cavity, and the electromagnetic driving device is arranged in the device inner cavity.

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