Miniature fan and electronic device

Abstract

The utility model discloses a kind of micro fan and electronic equipment, it is related to fan technical field, micro fan includes shell assembly, vibration plate assembly, driving device and rear cavity check valve component. Vibration plate assembly is connected with shell, and form rear cavity located in vibration plate assembly side, vibration plate assembly includes one end fixed one end overhanging vibration plate, shell includes the air inlet and air outlet of intercommunication rear cavity and outside;Driving device is located in rear cavity, driving device includes permanent magnet magnetic circuit component, coil and armature, permanent magnet magnetic circuit component and coil are relatively fixed with shell assembly, armature includes the movement sheet of being passed in coil and permanent magnet magnetic circuit component and the connecting rod connected between movement sheet and vibration plate, coil is used to drive movement sheet vibration;Rear cavity check valve component, connected with shell, for controlling airflow from air inlet to air outlet one-way flow. The structure of micro fan is compact, small in size, and driving efficiency is high, can play good heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a miniature fan and electronic device. Background Technology

[0002] Electronic devices continuously generate heat during operation, requiring timely heat dissipation to ensure reliable operation. When electronic devices are large and have sufficient space, large fans can be installed for cooling, just as computer cases can be equipped with case fans. However, for some small electronic devices (such as mobile phones, tablets, or portable electronic products like chargers), their small size makes it impossible to install traditional fans for cooling.

[0003] Therefore, the heat dissipation problem of small electronic devices urgently needs to be solved.

[0004] Traditional cooling methods use a motor to drive a fan to generate airflow. However, this type of fan is difficult to miniaturize and is not suitable for use in small spaces. Therefore, it cannot be installed inside small electronic devices to cool the electronic components inside.

[0005] Currently, some small electronic devices incorporate piezoelectric fans for heat dissipation, utilizing the piezoelectric effect to generate airflow. For example, by energizing a piezoelectric ceramic plate, the resulting deformation fans air, creating airflow and thus cooling the internal components of small electronic devices. However, generating a large airflow requires a very high driving voltage for piezoelectric fans, which is detrimental to controlling the power consumption and battery life of small electronic devices.

[0006] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0007] The purpose of this invention is to provide a miniature fan to solve the heat dissipation problem in small spaces.

[0008] To achieve the aforementioned objectives, this utility model proposes a miniature fan, comprising:

[0009] Housing assembly, including housing;

[0010] A vibrating plate assembly is connected to the housing and forms a rear cavity located on one side of the vibrating plate assembly. The vibrating plate assembly includes a vibrating plate, and the housing includes an air inlet and an air outlet communicating with the rear cavity and the outside.

[0011] A driving device, disposed in the rear cavity, includes a permanent magnet circuit assembly, a coil, and an armature. The permanent magnet circuit assembly and the coil are both fixed relative to the outer casing assembly. The armature includes a moving plate passing through the coil and the permanent magnet circuit assembly. The moving plate and the vibrating plate are connected by a connecting rod. The coil drives the moving plate to vibrate.

[0012] The rear cavity check valve assembly, connected to the housing, is used to control the airflow to flow unidirectionally from the air inlet to the air outlet.

[0013] On the other hand, this invention proposes an electronic device including the miniature fan described above.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] According to some embodiments of this utility model, a miniature fan includes a housing assembly, a vibrating plate assembly, a driving device, and a rear cavity check valve assembly. The driving device includes a permanent magnet circuit assembly, a coil, and an armature. The permanent magnet circuit assembly and the coil are both fixed relative to the housing assembly. The armature includes a moving plate passing through the coil and the permanent magnet circuit assembly. The moving plate and the vibrating plate are connected by a connecting rod. The coil drives the moving plate to vibrate, and the moving plate drives the vibrating plate to vibrate via the connecting rod. Since the rear cavity check valve assembly can control the airflow to flow unidirectionally from the air inlet to the air outlet, the miniature fan can draw in air from the air inlet and expel air from the air outlet, achieving a unidirectional airflow effect. The miniature fan has a compact structure and small size, making it suitable for applications in confined spaces. In addition, the driving device has high driving efficiency, providing a large driving force with a small current, resulting in good heat dissipation and helping to reduce the power consumption of electronic devices. Attached Figure Description

[0016] Figure 1a This is a three-dimensional schematic diagram of a miniature fan according to some embodiments of the present invention. In the figure, the miniature fan is provided with an air inlet check and an air outlet check.

[0017] Figure 1b yes Figure 1a The exploded view of the miniature fan shown.

[0018] Figure 2 yes Figure 1a The diagram shows a cross-sectional view of a miniature fan.

[0019] Figure 3 This is a schematic diagram of the structure in some embodiments of the present invention, showing the connection between the vibrating plate and the annular frame.

[0020] Figure 4a This is a structural schematic diagram of the vibrating plate assembly in some embodiments of this utility model.

[0021] Figure 4b yes Figure 4a The exploded view of the vibrating plate assembly is shown.

[0022] Figure 5 This is a cross-sectional schematic diagram of a miniature fan according to some embodiments of the present invention. In the figure, the miniature fan is only provided with an air inlet check element.

[0023] Figure 6 This is a three-dimensional schematic diagram of the air inlet check valve and the air outlet check valve in some embodiments of this utility model.

[0024] Figure 7a yes Figure 5 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0025] Figure 7b yes Figure 5 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0026] Figure 8 This is a cross-sectional schematic diagram of a miniature fan according to some embodiments of the present invention. In the figure, the miniature fan is only provided with an air outlet check valve.

[0027] Figure 9a yes Figure 8 The illustrated embodiment shows a schematic diagram of the airflow when the vibrating plate moves downwards.

[0028] Figure 9b yes Figure 8 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0029] Figure 10a yes Figure 2 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0030] Figure 10b yes Figure 2 The illustrated embodiment shows a schematic diagram of the airflow when the vibrating plate moves downwards.

[0031] Figure 11 yes Figure 2 The diagram shows a miniature fan with filler material inside its rear cavity.

[0032] Figure 12 This is a schematic diagram showing the positions of the miniature fan and heat source in some embodiments of this utility model.

[0033] Figure 13 This is a top-view schematic diagram showing the positions of the miniature fan and the heat source in some embodiments of this utility model. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0035] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] like Figures 1a to 2 As shown, Figures 1a to 2 A miniature fan of some embodiments is shown, which includes a housing assembly 1, a vibrating plate assembly 2, a drive unit 3, and a rear cavity check assembly 5.

[0038] The outer casing assembly 1 may be formed by connecting one or more components, and has a receiving space therein. Figures 1a to 2 In the illustrated embodiment, the housing assembly 1 includes a housing 11 and a cover plate 12. The housing 11 has an open end 110, and the cover plate 12 covers the open end 110 and cooperates with the housing 11 to form an internal cavity for accommodating other components.

[0039] The vibrating plate assembly 2 is connected to the outer shell assembly 1, dividing the internal cavity of the outer shell assembly 1 into a front cavity 14 and a rear cavity 15. Specifically, the front cavity 14 is located on the side of the vibrating plate assembly 2 near the cover plate 12, and the rear cavity 15 is located on the side of the vibrating plate assembly 2 near the housing 11. The outer shell assembly 1 includes an air inlet 102 and an air outlet 103 that connect the rear cavity 15 to the outside, and a rear cavity air duct is formed between the air inlet 102 and the air outlet 103.

[0040] like Figure 2 and Figure 3As shown, the vibrating plate assembly 2 includes a vibrating plate 20 with one end fixed and the other end suspended. The fixed end of the vibrating plate 20 is called the fixed end 20a, and the suspended end of the vibrating plate 20 is called the suspended end 20b. Figure 2 In the illustrated embodiment, the fixed end 20a is disposed adjacent to the air inlet 102, and the fixed end 20a is closer to the air inlet 102 than the suspended end 20b. The suspended end 20b is disposed adjacent to the air outlet 103, and the suspended end 20b is closer to the air outlet 103 than the fixed end 20a. The suspended end 20b of the vibrating plate 20 can vibrate relative to the fixed end 20a. The vibrating plate 20 is connected to the driving device 3 and can vibrate relative to the outer casing assembly 1 under the drive of the driving device 3.

[0041] In some embodiments, the vibrating plate assembly 2 includes an annular frame 21 connected to the housing assembly 1, and the vibrating plate 20 is located inside the annular frame 21, with one end connected to the annular frame 21. Optionally, the vibrating plate 20 and the annular frame 21 are integrally formed, with the connection portion 200 between the vibrating plate 20 and the annular frame 21 serving as a hinge, and the vibrating plate 20 vibrating with the hinge as a base point. The width of the connection portion 200 is smaller than the width of the vibrating plate 20, reducing the resistance experienced by the vibrating plate 20 during vibration.

[0042] In this embodiment, the vibrating plate assembly 2 is located inside the housing 11, and the annular frame 21 is connected to the inner side surface 111 of the outer shell assembly 1. It can be understood that the outer shell assembly 1 includes an inner top surface 120 on the cover plate 12 (the inner top surface 120 can also be understood as the inner top surface 120 of the front cavity 14), an inner bottom surface 1130 on the bottom plate 113 of the housing 11, an inner side surface 111 between the inner top surface 120 and the inner bottom surface 1130, and an outer side surface 112 corresponding to the inner side surface 111 and located outside the outer shell assembly 1.

[0043] Optional, such as Figure 2 and Figure 4a , Figure 4b As shown, the vibrating plate assembly 2 also includes an annular bracket 23 connected to the annular frame 21. The annular bracket 23 can increase the structural strength of the vibrating plate assembly 2 and can be connected to the outer shell assembly 1 through the annular bracket 23.

[0044] In some embodiments, such as Figure 4a and Figure 4b As shown, the vibrating plate assembly 2 includes a diaphragm 22 that at least covers the gap 24 between the vibrating plate 20 and the annular frame 21. The diaphragm 22 reduces gas exchange between the front chamber 14 and the rear chamber 15, thereby increasing the volume of gas driven by the vibrating plate 20 during vibration, which is beneficial for increasing wind power. In other embodiments, such as... Figure 3As shown, the vibrating plate assembly 2 does not include the diaphragm 22, and its gap 24 is exposed. The efficiency of the vibrating plate 20 in driving the gas is ensured by controlling the width of the gap 24. Optionally, the width W1 of the gap 24 is 0.01mm~0.06mm to ensure the efficiency of the vibrating plate 20 in driving the gas while keeping the processing cost reasonable.

[0045] like Figure 2 As shown, the driving device 3 is located in the rear cavity 15 and is connected to the outer shell assembly 1, used to drive the vibrating plate 20 to vibrate. In some embodiments, the driving device 3 includes a permanent magnet circuit assembly 30, a coil 31, and an armature 32. The permanent magnet circuit assembly 30 and the coil 31 are both fixed relative to the outer shell assembly 1. The armature 32 includes a moving plate 321 that passes through the coil 31 and the permanent magnet circuit assembly 30. The moving plate 321 and the vibrating plate 20 are connected by a connecting rod 322. The coil 31 is used to drive the moving plate 321 to reciprocate along the thickness direction of the moving plate 321. When the coil 31 is energized, it will polarize the moving plate 321. When the direction of the current flowing into the coil 31 is changed, the polarity of the moving plate 321 will be changed, causing it to vibrate under the interaction with the magnetic field of the permanent magnet circuit assembly 30, and then drive the vibrating plate 20 to vibrate through the connecting rod 322.

[0046] In some embodiments, the armature 32 is U-shaped and includes a fixed plate 320 fixedly connected to the permanent magnet circuit assembly 30. The permanent magnet circuit assembly 30 includes a magnet assembly comprising two magnets 301 with opposite poles, and a moving plate 321 passing between the two magnets 301. When alternating current is applied to the coil 31, the polarity of the moving plate 321 between the two magnets 301 changes (switching between N and S), thereby generating vibration. Optionally, the permanent magnet circuit assembly 30 further includes an edge armature assembly 300, which has a through hole 3000. The magnet assembly is disposed within the through hole 3000 and connected to the edge armature assembly 300. The edge armature assembly 300 can guide the magnetic field lines of the magnet assembly to form a magnetic circuit, thereby improving the magnetic field utilization efficiency and increasing the driving force.

[0047] Optionally, the drive device 3 can be connected to the housing 11 by connecting the edge iron assembly 300 of the permanent magnet circuit assembly 30 to the housing 11 or by connecting the coil 31 to the housing 11. Figure 2 In the illustrated embodiment, coil 31 is connected to edge assembly 300, and both edge assembly 300 and coil 31 are connected to the inner bottom surface 1130 of housing assembly 1.

[0048] In this embodiment, coil 31 and permanent magnet circuit assembly 30 are connected. Both permanent magnet circuit assembly 30 and coil 31 are connected to the inner bottom surface 1130. Moving plate 321 extends to the side of permanent magnet circuit assembly 30 away from coil 31. Connecting rod 322 is connected to the end of moving plate 321, located on the side of permanent magnet circuit assembly 30 away from coil 31, and connected to the end of vibrating plate 20 away from hinge (suspended end 20b). That is, connecting rod 322 and hinge are located at opposite ends of the length of vibrating plate 20. Of course, in other embodiments, coil 31 and magnet assembly can be spaced apart, with connecting rod 322 located between coil 31 and magnet assembly, passing through edge assembly 300 and fixing plate 320, and connected to the area approximately in the middle of vibrating plate 20.

[0049] The rear cavity check valve assembly 5 is connected to the housing 11 and is used to control the unidirectional flow of air from the air inlet 102 to the air outlet 103, thereby achieving unidirectional airflow from the micro fan and heat dissipation in a small space. When the vibrating plate 20 vibrates, it changes the size of the space inside the rear cavity 15, causing the volume of the rear cavity 15 to cycle between increasing and decreasing. When the volume of the rear cavity 15 decreases, gas is discharged from the air outlet 103; when the volume of the rear cavity 15 increases, gas is drawn in from the air inlet 102. This allows for a continuous flow of gas from the air inlet 102 to the air outlet 103, achieving unidirectional airflow and thus serving as a fan for heat dissipation. It is understood that controlling the unidirectional flow of airflow does not necessarily mean that all the gas can only flow in one direction; it is sufficient that most of the gas can flow in one direction.

[0050] Understandably, by providing airflow through the vibrating plate 20 and restricting the airflow direction through the rear cavity check assembly 5 to achieve unidirectional airflow, compared to the traditional structure of a motor driving a fan, it is beneficial for the miniaturization of micro fans, improving operational reliability, reducing costs, and ensuring airflow.

[0051] Furthermore, compared to piezoelectric fans, the drive device 3 has higher driving efficiency, providing greater driving force with a smaller current, resulting in better heat dissipation and reducing the power consumption of electronic devices. Additionally, the drive device 3 can be made very small, thus the overall size of the micro fan is small, making it suitable for use in confined spaces, such as for heat dissipation inside portable electronic devices like mobile phones, tablets, smart glasses, or chargers. (The charger is an example of a charger for portable electronic devices like mobile phones, tablets, and smart glasses.)

[0052] In this embodiment, the outer shell assembly 1 is generally rectangular, having a length direction, a width direction, and a thickness direction (or height direction). Components such as the front cavity 14, rear cavity 15, vibrating plate assembly 2, and moving plate 321 are aligned with the length, width, and thickness directions of the outer shell assembly 1. The extending direction of the moving plate 321 and the vibrating plate 20 is aligned with the length direction of the outer shell assembly 1. The vibration direction of the moving plate 321 is aligned with the thickness direction of the outer shell assembly 1 and the moving plate 321.

[0053] The airflow direction at the air inlet 102 and / or the airflow direction at the air outlet 103 can be controlled to enable unidirectional airflow. An embodiment of controlling the airflow direction at the air inlet 102 will be described below.

[0054] In some embodiments, such as Figure 5 and Figure 6 As shown, the rear cavity check assembly 5 includes an air inlet check member 50 corresponding to the air inlet 102. The air inlet check member 50 includes a fixed part 400 connected to the housing 11 and a movable blade 401 connected to the fixed part 400, as shown. Figure 7a As shown, the movable blade 401 of the inlet check valve 50 swings towards the closed (closer) inlet 102 under the action of airflow when the vibrating plate 20 moves towards the rear cavity 15, thereby hindering the airflow from exiting the inlet 102. Simultaneously, the airflow can exit from the outlet 103. Figure 7b As shown, the movable blade 401 of the inlet check valve 50 swings in the direction of opening (moving away from) the inlet 102 under the action of airflow when the vibrating plate 20 moves away from the rear cavity 15, so that the airflow can smoothly enter from the inlet 102. In the attached figure, the direction of airflow is indicated by a solid line with an arrow, and the direction of movement of the vibrating plate 20 is indicated by a dashed line with an arrow.

[0055] Understandably, the movable blade 401 oscillates under the influence of airflow. This oscillation can be rigid or non-rigid. Rigid oscillation refers to the movable blade 401 oscillating as a whole, with minimal deformation during oscillation. Non-rigid oscillation refers to the movable blade 401 bending and deforming; for example, it can bend and deform only itself, or it can bend and deform while deflecting as a whole. Optionally, the fixed part 400, like the movable blade 401, is plate-shaped.

[0056] Understandably, due to the small size of the micro fan, the thickness of the air inlet check valve 50 is also very thin. When the vibrating plate 20 vibrates, it drives the gas flow in the rear cavity 15. The airflow will naturally drive the movable blade 401 to swing. That is, the movable blade 401 automatically opens and closes the rear cavity air duct under the action of the airflow, making the structure simpler.

[0057] In some embodiments, the fixing part 400 of the air inlet check member 50 is connected to the inner side surface 111, and the movable blade 401 of the air inlet check member 50 is disposed opposite to the air inlet 102 so that it can quickly open or close the air inlet 102. When the vibrating plate 20 compresses the space of the rear cavity 15, the airflow can push the movable blade 401 to adhere to the inner side surface 111, sealing the air inlet 102, and more reliably realizing the unidirectional flow of airflow.

[0058] Optionally, in some embodiments, in its natural state, the movable blade 401 of the inlet check member 50 can seal the corresponding inlet 102 to close the inlet 102 more quickly. In other embodiments, in its natural state, there is a gap between the movable blade 401 and its corresponding inlet 102. For example, the movable blade 401 of the inlet check member 50 extends from the fixed portion 400 in a direction away from the inner surface 111. The movable blade 401 can be flat or curved.

[0059] In some embodiments, the movable blade 401 is flat. Optionally, in its natural state, the movable blade 401 of the inlet check member 50 has an angle of less than or equal to 20° with the mounting surface of the fixed part 400, so that when the vibrating plate 20 vibrates, the movable blade 401 can reliably respond to the movement of the vibrating plate 20 and swing. Further optionally, the angle is less than or equal to 15°. Even more optionally, in its natural state, the movable blade 401 of the inlet check member 50 seals the air inlet 102, that is, the movable blade 401 is in contact with the inner surface 111 (angle is 0°), which can more quickly close the air inlet 102.

[0060] It is understandable that the air inlet 102 and the air inlet check 50 can be located on the first inner end face 1110 or on the side inner end face.

[0061] The following is an example of controlling the airflow direction of the air outlet 103.

[0062] In some embodiments, such as Figure 8 and Figure 6 As shown, the rear cavity check assembly 5 includes an air outlet check member 51 corresponding to the air outlet 103. The air outlet check member 51 has a similar structure to the air inlet check member 50, including a fixing part 400 connected to the housing 11 and a movable blade 401 connected to the fixing part 400. Figure 9a As shown, the movable blade 401 of the air outlet check valve 51 swings in the direction of opening (moving away from) the air outlet 103 under the action of airflow when the vibrating plate 20 moves towards the rear cavity 15, thereby allowing airflow to be discharged from the air outlet 103. Figure 9bAs shown, when the vibrating plate 20 moves away from the rear cavity 15, the movable blade 401 of the air outlet check piece 51 swings towards the direction of closing (approaching) the air outlet 103 under the action of the airflow, so as to prevent the airflow from entering from the air outlet 103. At the same time, the airflow can enter from the air inlet 102.

[0063] In some embodiments, the fixing part 400 of the air outlet check member 51 is connected to the outer side 112, and the movable blade 401 of the air outlet check member 51 is disposed opposite to the air outlet 103 so that it can quickly open or close the air outlet 103. When the vibrating plate 20 moves away from the rear cavity 15, the airflow can push the movable blade 401 to adhere to the inner side 112, sealing the air outlet 103, and more reliably realizing the one-way flow of airflow.

[0064] Optionally, in some embodiments, in its natural state, the movable blade 401 of the outlet check member 51 can seal the corresponding outlet 103 to close the outlet 103 more quickly. In other embodiments, in its natural state, there is a gap between the movable blade 401 and its corresponding outlet 103. For example, the movable blade 401 of the outlet check member 51 extends from the fixed portion 400 in a direction away from the outer surface 112. The movable blade 401 can be flat or curved.

[0065] In some embodiments, the movable blade 401 is flat. Optionally, in its natural state (meaning without airflow disturbance), the movable blade 401 of the outlet check member 51 has an angle of less than 20° with the mounting surface of the fixed part 400, so that when the vibrating plate 20 vibrates, the movable blade 401 can reliably respond to the movement of the vibrating plate 20 and swing. Further optionally, the angle is less than or equal to 15°. Even more optionally, in its natural state, the movable blade 401 of the outlet check member 51 seals the air inlet 102, and the movable blade 401 also fits against the outer surface 112, which can more quickly close the air outlet 103.

[0066] It is understandable that the air outlet 103 and the air outlet check piece 51 can be set on the first outer end face 1120 or on the side outer end face.

[0067] The following is an embodiment of simultaneously controlling the airflow direction of the air inlet 102 and the air outlet 103.

[0068] like Figure 2 As shown, the rear cavity check assembly 5 includes an inlet check 50 corresponding to the air inlet 102 and an outlet check 51 corresponding to the air outlet 103. The structure and installation position of the inlet check 50 and the outlet check 51 can be referred to the above.

[0069] like Figure 10a As shown, when the vibrating plate 20 moves away from the rear cavity 15, the volume of the rear cavity 15 increases, generating negative pressure. Airflow enters through the air inlet 102 and pushes the movable blade 401 of the air inlet check 50 to swing away from the air inlet 102, thus opening the air inlet 102 and allowing smooth airflow. Simultaneously, external airflow moves towards the air outlet 103, pushing the movable blade 401 of the air outlet check 51 to swing towards the air outlet 103, thus closing the air outlet 103. Conversely, as... Figure 10b As shown, when the vibrating plate 20 moves toward the rear cavity 15, the rear cavity 15 is compressed, and the airflow pushes the movable blade 401 of the air inlet check 50 to swing toward the air inlet 102, thereby closing the air inlet 102. At the same time, the airflow pushes the movable blade 401 of the air outlet check 51 to swing away from the air outlet 103, thereby opening the air outlet 103, so that the airflow flows out from the air outlet 103, realizing the function of automatically alternating the opening and closing of the air inlet 102 and the air outlet 103.

[0070] Thus, during the vibration of the vibrating plate 20, the rear cavity check valve assembly 5 can simultaneously control the opening and closing of the air inlet 102 and the air outlet 103, which can effectively improve the air outlet efficiency, increase the air force, and improve the heat dissipation effect.

[0071] Understandably, the movable blade 401 does not have to be planar; for example, it can also be curved.

[0072] like Figure 2 As shown, the housing assembly 1 has a mid-surface 1a perpendicular to its length direction. The mid-surface 1a is a plane perpendicular to the length direction and passing through the midpoint of the length direction of the housing assembly 1. Figure 2 In the middle, the middle surface 1a and the first outer end surface 1120 and the second outer end surface 1121 are equidistant. It can be understood that the inner surface 111 of the housing assembly 1 has two inner end surfaces (the first inner end surface 1110 and the second inner end surface 1111, respectively) located at both ends of the length direction of the housing assembly 1, and the outer surface 112 of the housing assembly 1 has two outer end surfaces (the first outer end surface 1120 and the second outer end surface 1121, respectively) located at both ends of the length direction of the housing assembly 1. The first outer end surface 1120 corresponds to the first inner end surface 1110, and the second outer end surface 1121 corresponds to the second inner end surface 1111. The surface of the inner surface 111 connecting the first inner end surface 1110 and the second inner end surface 1111 is called the side inner end surface, and the surface of the outer surface 112 connecting the first outer end surface 1120 and the second outer end surface 1121 is called the side outer end surface.

[0073] Optionally, the movable blades 401 of the inlet check 40 and the outlet check 41 are located on opposite sides of the middle surface 1a to dissipate the absorbed heat from the heat source to a more distant location, thereby improving heat dissipation. It is understood that the inlet 102, the fixed end 20a of the vibrating plate 20, and the movable blades 401 of the inlet check 50 are located on the same side of the middle surface 1a, while the outlet 103, the suspended end 20b of the vibrating plate 20, and the movable blades 401 of the outlet check 51 are located on the other side of the middle surface 1a.

[0074] Optionally, the air inlet 102 and the fixed end 20a of the vibrating plate 20 are arranged adjacent to each other, and the air outlet 103 is arranged adjacent to the suspended end 20b of the vibrating plate 20. For example, the air inlet 102 and the air outlet 103 are respectively located on the first outer end face 1120 and the second outer end face 1121 of the outer shell assembly 1, located at both ends of the airflow channel of the rear cavity 15, so that the airflow is smoother and it is beneficial to further improve the wind force.

[0075] Optionally, the miniature fan also includes a filler 16 located inside the rear cavity 15. The filler 16 is positioned in a location that does not affect the movement of the drive device 3, the vibrating plate assembly 2, and the rear cavity check assembly 5. It occupies space inside the rear cavity 15, so that the amount of gas contained inside the rear cavity 15 is smaller, and the rear cavity check assembly 5 can respond more quickly when the vibrating plate 20 vibrates. Figure 11 In the diagram, the filler 16 is shown at the lower left and lower right corners of the housing 11.

[0076] In this embodiment, the inlet check valve 40 and the outlet check valve 41 are two independent parts. The inlet check valve 40 and the outlet check valve 41 are each integrally formed. For example, the movable blade 401 and the fixing part 400 can be punched out from the sheet material, and creases can be pre-created by bending so that the movable blade 401 can bend and swing at the crease.

[0077] In some embodiments, such as Figure 6 As shown, the movable blade 401 and the fixed part 400 are connected by at least two connecting ribs 402. Since the width of the connecting ribs 402 is much smaller than the width of the movable blade 401, a smaller airflow is needed to drive the movable blade 401 to swing, resulting in higher sensitivity. It is understood that the connecting ribs 402 can be formed in one step during punching. In other embodiments, the connecting portion 403 between the movable blade 401 and the fixed part 400 can be continuous without any openwork; for example, a continuous crease or a continuous arc-shaped portion can be formed between them.

[0078] Optionally, the inlet check valve 50 and the outlet check valve 51 are made of elastic materials, which can open and close the air duct through elastic deformation. The elastic materials can be metallic or non-metallic materials, such as spring steel sheets, beryllium copper, plastics, carbon fiber, etc. The elastic materials can be non-magnetic materials to avoid being affected by magnetic fields.

[0079] It is understood that the housing assembly 1 may or may not include the cover plate 12. When the housing assembly 1 does not include the cover plate 12, the thickness of the micro fan can be further reduced. When the housing assembly 1 has the cover plate 12, the internal structure can be better protected.

[0080] It should be noted that when the airflow in the rear cavity passes through the drive device 3, it can carry away the heat generated by the drive device 3, thereby dissipating heat from the drive device 3 and further improving the reliability of the drive device 3.

[0081] In addition, by setting the fixed end 20a of the vibrating plate 20 relatively close to the air outlet 103 and the suspended end 20b relatively close to the air inlet 102, unidirectional air outlet can also be achieved.

[0082] This invention also proposes an electronic device that includes the miniature fan 92 described in any of the above embodiments.

[0083] Electronic devices can be portable electronic devices such as mobile phones, tablets, or chargers.

[0084] like Figure 12 and Figure 13 As shown, the electronic device includes a heat source 90, which may be, for example, a chip or other electronic components that generate heat during operation. When installed, the miniature fan 92 can have its air inlet 102 and / or air outlet 103 facing the heat source 90 to quickly conduct away the heat, thus achieving heat dissipation. Alternatively, its air outlet 103 and / or air outlet 103 can be facing the heat source 90 to blow air onto it and remove its heat, thus achieving heat dissipation.

[0085] Optionally, the electronic device includes a circuit board 91, a heat source 90 is mounted on the circuit board 91, and a miniature fan 92 is also mounted on the circuit board 91 and electrically connected to the circuit board 91. In this way, the miniature fan 92 can be directly powered and controlled through the circuit board 91, making installation more convenient.

[0086] In some embodiments, the electronic device includes a plurality of miniature fans 92, which dissipate heat from the heat source 90, thereby improving the heat dissipation effect. Even if one or more miniature fans 92 fail, the remaining miniature fans 92 can still continue to work, ensuring the reliability of heat dissipation.

[0087] In some embodiments, such as Figure 12 and Figure 13 As shown, at least one miniature fan 92 is arranged on each of the opposite sides of the heat source 90. The air inlet 102 and / or air outlet 102 of the miniature fan 92 located on one side of the heat source 90 (right side in the figure) is set towards the heat source 90, drawing air into the heat source 90. The air outlet 103 and / or air outlet 103 of the miniature fan 92 located on the other side of the heat source 90 (left side in the figure) is set towards the heat source 90, blowing air into the heat source 90. In this way, the left miniature fan 92 blows air into the heat source 90, while the right miniature fan 92 draws away the heat from the heat source 90, providing a stronger airflow and better heat dissipation. It can be understood that if the heat dissipation area of ​​the heat source 90 is large, more miniature fans 92 can be arranged on both sides of it.

[0088] In some embodiments, the electronic device includes a plurality of miniature fans 92, which are arranged in series, i.e., in two adjacent miniature fans 92, the air inlet 102 and / or air inlet 102 of one miniature fan 92 faces the air outlet 103 and / or air outlet 103 of the other miniature fan 92 (the two can be connected, for example, through a duct). Heat is carried away in a relay manner, enabling heat to be carried to a farther location more quickly. In cases where the cooling system duct is long, this ensures that the airflow does not decrease due to the excessive length of the duct. It is understood that the miniature fans 92 may include air inlet pipes, which simultaneously cover all air inlets 102 and air outlets 102 (if any). When multiple miniature fans 92 are connected in series, it is more convenient to simply connect the air outlet 80 to the air inlet pipe.

[0089] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0090] It should be noted that the miniature fan of this invention can also be applied to larger electronic devices to dissipate heat from heat sources on their circuit boards. For example, although traditional large fans can be installed in a computer case, a miniature fan can still be installed on the circuit board to specifically dissipate heat from electronic components that generate significant heat, thereby further improving the heat dissipation effect.

[0091] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A miniature fan, characterized in that, include: The housing assembly (1) includes a housing (11); The vibrating plate assembly (2) is connected to the housing (11) and forms a rear cavity (15) located on one side of the vibrating plate assembly (2). The vibrating plate assembly (2) includes a vibrating plate (20). The housing (11) includes an air inlet (102) and an air outlet (103) that connect the rear cavity (15) to the outside. A driving device (3) is provided in the rear cavity (15). The driving device (3) includes a permanent magnet circuit assembly (30), a coil (31) and an armature (32). The permanent magnet circuit assembly (30) and the coil (31) are fixed relative to the outer shell assembly (1). The armature (32) includes a moving plate (321) that passes through the coil (31) and the permanent magnet circuit assembly (30). The moving plate (321) and the vibrating plate (20) are connected by a connecting rod (322). The coil (31) is used to drive the moving plate (321) to vibrate. as well as, The rear cavity check assembly (5) is connected to the housing (11) and is used to control the airflow to flow unidirectionally from the air inlet (102) to the air outlet (103).

2. The miniature fan as described in claim 1, characterized in that, The rear cavity check assembly (5) includes an air inlet check member (50) corresponding to the air inlet (102). The air inlet check member (50) includes a fixed part (400) connected to the housing (11) and a movable blade (401) connected to the fixed part (400). When the vibrating plate (20) moves toward the rear cavity (15), the movable blade (401) of the air inlet check member (50) swings toward closing the air inlet (102) under the action of the airflow. When the vibrating plate (20) moves away from the rear cavity (15), it swings toward opening the air inlet (102) under the action of the airflow.

3. The miniature fan as described in claim 2, characterized in that, The outer casing assembly (1) has an inner side (111), the fixing part (400) of the air inlet check member (50) is connected to the inner side (111), and the movable blade (401) of the air inlet check member (50) is arranged opposite to the air inlet (102).

4. The miniature fan as described in claim 3, characterized in that, The movable blade (401) of the air inlet check member (50) seals the air inlet (102) in its natural state; or, the movable blade (401) of the air inlet check member (50) has a gap with the air inlet (102) in its natural state.

5. The miniature fan as described in claim 1, characterized in that, The rear cavity check assembly (5) includes an air outlet check member (51) corresponding to the air outlet (103). The air outlet check member (51) includes a fixed part (400) connected to the housing (11) and a movable blade (401) connected to the fixed part (400). When the vibrating plate (20) moves toward the rear cavity (15), the movable blade (401) of the air outlet check member (51) swings toward opening the air outlet (103) under the action of the airflow. When the vibrating plate (20) moves toward the side away from the rear cavity (15), it swings toward closing the air outlet (103) under the action of the airflow.

6. The miniature fan as described in claim 5, characterized in that, The outer casing assembly (1) has an outer side (112), the fixing part (400) of the air outlet check member (51) is connected to the outer side (112), and the movable blade (401) of the air outlet check member (51) is arranged opposite to the air outlet (103).

7. The miniature fan as described in claim 6, characterized in that, The movable blade (401) of the air outlet check piece (51) seals the air outlet (103) in its natural state; or, the movable blade (401) of the air outlet check piece (51) has a gap with the air outlet (103) in its natural state.

8. The miniature fan as described in claim 1, characterized in that, The rear cavity check assembly (5) includes an air inlet check member (50) corresponding to the air inlet (102) and an air outlet check member (51) corresponding to the air outlet (103). The air inlet check member (50) and the air outlet check member (51) each include a fixed part (400) connected to the outer shell assembly (1) and a movable blade (401) connected to the fixed part (400). The outer shell assembly (1) has a middle surface (1a) perpendicular to its length direction. The movable blade (401) of the air inlet check member (50) and the movable blade (401) of the air outlet check member (51) are located on both sides of the middle surface (1a).

9. The miniature fan as described in claim 8, characterized in that, The vibrating plate (20) has a fixed end (20a) and a suspended end (20b) located at its two ends respectively. The air inlet (102), the movable blade (401) of the air inlet check member (50) and the fixed end (20a) are located on the same side of the middle surface (1a), and the air outlet (103), the movable blade (401) of the air outlet check member (51) and the suspended end (20b) are located on the other side of the middle surface (1a).

10. The miniature fan as described in claim 8, characterized in that, The connection between the movable blade (401) and the fixed part (400) is continuous; or, The movable blade (401) and the fixed part (400) are connected by at least two connecting ribs (402).

11. The miniature fan as claimed in claim 1, characterized in that, The armature (32) is U-shaped and includes a fixed plate (320) fixedly connected to the permanent magnet circuit assembly (30). The permanent magnet circuit assembly (30) includes an iron edge assembly (300) with a through hole (3000) and a magnet assembly disposed in the through hole (3000). The magnet assembly includes two magnets (301) spaced apart along the thickness direction of the moving plate (321). The two magnets (301) are arranged with opposite poles facing each other. The fixed plate (320) is connected to the iron edge assembly (300), and the moving plate (321) is located between the two magnets (301).

12. The miniature fan as described in any one of claims 1 to 11, characterized in that, The housing assembly (1) includes a cover plate (12), and the housing (11) has an open end (110). The vibrating plate assembly (2) is disposed inside the outer shell assembly (1), the cover plate (12) seals the opening end (110), a front cavity (14) is formed between the vibrating plate assembly (2) and the cover plate (12), and the front cavity (14) and the rear cavity (15) are respectively located on both sides of the vibrating plate assembly (2).

13. The miniature fan as described in any one of claims 1 to 11, characterized in that, The vibrating plate assembly (2) includes an annular frame (21) connected to the housing (11), and the vibrating plate (20) is disposed inside the annular frame (21) with one end of its length direction hinged to the annular frame (21); The vibrating plate assembly (2) includes a diaphragm (22) that at least covers the gap between the vibrating plate (20) and the annular frame (21); or, the vibrating plate (20) and the annular frame (21) have an exposed gap with a width of 0.01 mm to 0.06 mm.

14. The miniature fan as described in any one of claims 1 to 11, characterized in that, It includes a filler (16) disposed in the rear cavity (15).

15. An electronic device, characterized in that, Including the miniature fan as described in any one of claims 1 to 14.

16. The electronic device as claimed in claim 15, characterized in that, The electronic device includes a heat source (90); The miniature fan is arranged on the same side of the heat source (90), and the miniature fan draws in or blows air onto the heat source (90); or, At least one miniature fan is arranged on each side of the heat source (90). The miniature fan on one side of the heat source (90) draws air into the heat source (90), and the miniature fan on the other side of the heat source (90) blows air into the heat source (90).

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