Miniature fan and electronic device

Abstract

The application discloses a micro fan and electronic equipment, and relates to the fan technical field, the micro fan includes a shell assembly, a vibration plate assembly and a driving device. The vibration plate assembly divides the shell assembly into a front cavity and a rear cavity, the vibration plate assembly includes a vibrating plate with one end fixed and one end suspended, the shell assembly includes an air inlet and an air outlet which are communicated with the front cavity and the outside, and the air inlet and the air outlet form a front cavity air duct; the driving device is arranged in the rear cavity and includes a permanent magnet magnetic circuit assembly, a coil and an armature, the permanent magnet magnetic circuit assembly and the coil are fixed relative to the shell assembly, the armature includes a moving piece arranged in the coil and the permanent magnet magnetic circuit assembly, the moving piece and the vibrating plate are connected through a connecting rod, and the coil is used for driving the moving piece to vibrate; the micro fan is compact in structure, small in size, high in driving efficiency, and capable of achieving good heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of fan technology, and more particularly 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. Summary of the Invention

[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 above-mentioned objectives, the present invention provides a miniature fan, comprising:

[0009] Housing components;

[0010] A vibrating plate assembly, connected to the outer shell assembly, divides the internal cavity of the outer shell assembly into a front cavity and a rear cavity. The vibrating plate assembly includes a vibrating plate fixed at one end and suspended at the other. The outer shell assembly is provided with an air inlet and an air outlet communicating with the front cavity and the outside, forming a front cavity air duct between the air inlet and the air outlet; and...

[0011] A driving device is disposed in the rear cavity. The driving device includes a permanent magnet circuit assembly, a coil, and an armature. The permanent magnet circuit assembly and the coil are fixed relative to the outer shell assembly. The armature includes a moving plate that passes through the coil and the permanent magnet circuit assembly. The moving plate and the vibrating plate are connected by a connecting rod. The coil is used to drive the moving plate to vibrate.

[0012] Furthermore, the miniature fan also includes a front cavity check valve assembly, which is connected to the housing assembly and is used to control the airflow to flow unidirectionally from the air inlet to the air outlet.

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

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

[0015] According to some embodiments of the present invention, a miniature fan includes a housing assembly, a vibrating plate assembly, and a driving device. 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 fixed plate fixedly connected to the permanent magnet circuit assembly and 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. The suspended end of the vibrating plate has a relatively larger displacement, allowing gas to be quickly discharged from the outlet and drawn in from the inlet under the fanning motion of the suspended end, achieving a heat dissipation effect. Simultaneously, the miniature fan has a compact structure and small size, enabling its application in confined spaces. Furthermore, 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 the miniature fan in Embodiment 1 of the present invention.

[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 schematic diagram of the structure of the vibrating plate assembly in some embodiments of the present invention.

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

[0022] Figure 5 This is an exploded view of the miniature fan in Embodiment 2 of the present invention.

[0023] Figure 6 This is a cross-sectional schematic diagram of the miniature fan in Embodiment 2 of the present invention.

[0024] Figure 7a This is a cross-sectional schematic diagram of the miniature fan in Embodiment 2 of the present invention. In the figure, the miniature fan is only provided with an air inlet check valve.

[0025] Figure 7b yes Figure 7a Enlarged view of section I in the middle.

[0026] Figure 8a yes Figure 7a The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0027] Figure 8b yes Figure 7a The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0028] Figure 9 This is a cross-sectional schematic diagram of the miniature fan in Embodiment 2 of the present invention. In the figure, the miniature fan is only provided with an air outlet check valve.

[0029] Figure 10 yes Figure 9 Enlarged view of Part II.

[0030] Figure 11a yes Figure 9 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0031] Figure 11b yes Figure 9 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0032] Figure 12a yes Figure 6 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0033] Figure 12b yes Figure 6 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0034] Figure 13a This is a schematic diagram of the structure of the front cavity check assembly in some embodiments of the present invention.

[0035] Figure 13bThis is a schematic diagram of the structure of the front cavity check assembly in some embodiments of the present invention. In the figure, the front cavity check assembly is integrally formed.

[0036] Figure 14 This is a schematic diagram of the structure of the inlet check valve and the outlet check valve in some embodiments of the present invention. In the figure, the connection between the fixed part and the movable blade is continuous in the width direction.

[0037] Figure 15 This is a schematic diagram of the structure of the inlet check valve and the outlet check valve in some embodiments of the present invention. In the figure, the movable blade is curved.

[0038] Figure 16 This is a cross-sectional schematic diagram of the miniature fan in Embodiment 3 of the present invention.

[0039] Figure 17a yes Figure 16 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0040] Figure 17b yes Figure 16 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0041] Figure 18a This is a three-dimensional schematic diagram of the miniature fan in Embodiment 4 of the present invention.

[0042] Figure 18b yes Figure 18a The diagram shows a cross-sectional view of a miniature fan.

[0043] Figure 18c yes Figure 18a A cross-sectional view of the miniature fan shown from another perspective.

[0044] Figure 19a This is a schematic diagram of the assembled cover plate, front cavity check valve assembly, and side frame assembly in Embodiment 4 of the present invention.

[0045] Figure 19b yes Figure 19a Exploded view of the structure shown.

[0046] Figure 20 This is a three-dimensional schematic diagram of the miniature fan in Embodiment 5 of the present invention.

[0047] Figure 21 yes Figure 20 The exploded view of the miniature fan shown.

[0048] Figure 22 yes Figure 20 The diagram shows a three-dimensional cross-sectional view of a miniature fan.

[0049] Figure 23 yes Figure 20 The diagram shows a cross-sectional view of a miniature fan.

[0050] Figure 24a yes Figure 23 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves upward.

[0051] Figure 24b yes Figure 23 The illustrated embodiment is a schematic diagram of the airflow when the vibrating plate moves downwards.

[0052] Figure 25 This is a three-dimensional schematic diagram of the air inlet check valve and the air outlet check valve in Embodiment 5 of the present invention.

[0053] Figure 26 yes Figure 23 The diagram shows a miniature fan with filler material inside its rear cavity.

[0054] Figure 27 This is a schematic diagram showing the positions of the miniature fan and heat source in some embodiments of the present invention.

[0055] Figure 28 This is a top-view diagram showing the positions of the miniature fan and the heat source in some embodiments of the present invention. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Example 1

[0060] 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, and a drive unit 3.

[0061] 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.

[0062] 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 100 and an air outlet 101 that connect the front cavity 14 to the outside, and a front cavity air duct is formed between the air inlet 100 and the air outlet 101.

[0063] like Figure 2 and Figure 3 As 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 100, and the fixed end 20a is closer to the air inlet 100 than the suspended end 20b. The suspended end 20b is disposed adjacent to the air outlet 101, and the suspended end 20b is closer to the air outlet 101 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 shell assembly 1 under the drive of the driving device 3.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] It is understandable that the vibration plate 20 will generate airflow when it vibrates. Since one end is fixed and the other end is suspended, the suspended end 20b of the vibration plate 20 has a relatively larger displacement. The gas can be quickly discharged from the outlet 101 and enter from the inlet 100 under the fanning action of the suspended end 20b, achieving a heat dissipation effect. At the same time, the air outlet through the flat front cavity is conducive to the miniaturization of the micro fan, improving the reliability of operation and reducing costs.

[0071] 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.)

[0072] 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.

[0073] In some embodiments, such as Figure 4a , Figure 4b and Figure 7b 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 3 As 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.

[0074] 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.

[0075] Example 2

[0076] This embodiment is a variation of Embodiment 1. In this embodiment, as... Figure 5 and Figure 6 As shown, the miniature fan also includes a front cavity check assembly 4.

[0077] The front chamber check valve assembly 4 is connected to the outer shell assembly 1 and is used to control the unidirectional flow of air from the air inlet 100 to the air outlet 101. When the vibrating plate 20 vibrates, it changes the size of the space inside the front chamber 14, causing the volume of the front chamber 14 to cycle between increasing and decreasing. When the volume of the front chamber 14 decreases, gas is discharged from the air outlet 101, and when the volume of the front chamber 14 increases, gas is drawn in from the air inlet 100. In this way, gas can be continuously drawn in from the air inlet 100 and discharged from the air outlet 101, realizing the unidirectional flow of gas and playing the role of fan cooling.

[0078] It is understandable that by providing airflow through the vibrating plate 20 and restricting the airflow direction through the front cavity check assembly 4 to achieve unidirectional airflow, air can be reliably drawn in from the air inlet 100 and exhausted from the air outlet 101, which is beneficial to and ensures the wind force, and allows the airflow to flow better in one direction, thereby improving the heat dissipation effect.

[0079] It is understandable that controlling the unidirectional flow of air 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.

[0080] Gas can be allowed to flow in one direction by controlling the airflow direction of the air inlet 100 and / or the airflow direction of the outlet 101. An embodiment of controlling the airflow direction of the air inlet 100 will be described below.

[0081] In some embodiments, such as Figure 7a and Figure 7b As shown, the front cavity check assembly 4 includes an inlet check member 40 corresponding to the inlet 100. The inlet check member 40 includes a fixed part 400 connected to the outer shell assembly 1 and a movable blade 401 connected to the fixed part 400. When the vibrating plate 20 moves towards the front cavity 14, the movable blade 401 of the inlet check member 40 swings in the direction of closing the front cavity air passage (closer to the inlet 100) to prevent airflow from flowing in from the inlet 100, while not affecting the airflow from discharging from the outlet 101. When the vibrating plate 20 moves towards the rear cavity 15, the movable blade 401 of the inlet check member 40 swings in the direction of opening the front cavity air passage (away from the inlet 100) to promote airflow from flowing in from the inlet 100.

[0082] 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.

[0083] Understandably, due to the small size of the micro fan, the thickness of the air inlet check valve 40 is also very thin. When the vibrating plate 20 vibrates, it drives the gas flow in the front cavity 14. The airflow will naturally drive the movable blade 401 to swing. That is, the movable blade 401 automatically opens and closes the front cavity air duct under the action of the airflow, making the structure simpler.

[0084] In some embodiments, the fixing part 400 is connected to the inner surface of the front cavity 14, and the movable blade 401 of the air inlet check member 40 extends toward the side away from the air inlet 100 and the mounting surface of the fixing part 400. The mounting surface of the fixing part 400 refers to the plane on the micro fan where the surface used to connect with the fixing part 400 is located, or the plane where the surface 400a of the fixing part 400 is used to connect with other components. Figure 7a and Figure 7b In the illustrated embodiment, the fixing part 400 is connected to the inner top surface 120, and the movable blade 401 of the air inlet check member 40 extends toward the vibrating plate 20. When the vibrating plate 20 moves toward the front cavity 14 and compresses the front cavity 14, reference... Figure 8a The airflow will move towards the inlet 100 and the outlet 101. The airflow moving towards the inlet 100 will push the movable blade 401 to swing towards the inlet 100, thereby hindering the airflow from moving towards the inlet 100. Conversely, refer to... Figure 8b When the vibrating plate 20 moves towards the rear chamber 15, the volume of the front chamber 14 increases, generating negative pressure. The external airflow can push the movable blade 401 to swing away from the air inlet 100, thereby opening the air inlet and realizing the function of automatically opening and closing the air inlet 100. 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.

[0085] It is understood that the fixing part 400 does not necessarily have to be connected to the inner top surface 120; for example, it can also be connected to the inner side surface 111 of the front cavity 14. When the fixing part 400 is connected to the inner side surface 111, the movable blade 401 can be parallel to the thickness direction of the housing assembly 1.

[0086] The following is an example of controlling the airflow direction of the air outlet 101.

[0087] In some embodiments, such as Figure 9 and Figure 10 As shown, the front cavity check assembly 4 includes an outlet check member 41 corresponding to the outlet 101. The structure of the outlet check member 41 is the same as that of the inlet check member 40. It includes a fixed part 400 connected to the outer shell assembly 1 and a movable blade 401 connected to the fixed part 400. When the vibrating plate 20 moves toward the front cavity 14, the movable blade 401 of the outlet check member 41 swings toward the direction of opening the front cavity air duct (towards the outlet 101), so that the airflow flows out smoothly from the outlet 101. When the vibrating plate 20 moves toward the rear cavity 15, it swings toward the direction of closing the front cavity air duct (away from the outlet 101) to prevent the airflow from flowing in from the outlet 101.

[0088] Understandably, due to the small size of the micro fan, the thickness of the air outlet check valve 41 is also very thin. When the vibrating plate 20 vibrates, it drives the gas flow in the front cavity 14. The airflow will naturally drive the movable blade 401 to swing. That is, the movable blade 401 automatically opens and closes the front cavity air duct under the action of the airflow, making the structure simpler.

[0089] In some embodiments, the fixing part 400 is connected to the inner surface of the front cavity 14, and the movable blade 401 of the air outlet check member 41 extends toward the mounting surface of the air outlet 101 and away from the fixing part 400. Figure 9 and Figure 10 In the illustrated embodiment, the fixing part 400 is connected to the inner top surface 120, and the movable blade 401 of the air outlet check valve 41 extends toward the vibrating plate 20. When the vibrating plate 20 moves toward the front cavity 14 and compresses the front cavity 14, reference... Figure 11a The airflow will move towards the inlet 100 and the outlet 101. The airflow moving towards the outlet 101 will push the movable blade 401 to swing towards the outlet 101, thereby causing the airflow to be discharged from the outlet 101. Conversely, refer to... Figure 11b When the vibrating plate 20 moves toward the rear chamber 15, the volume of the front chamber 14 increases, generating negative pressure. The external airflow can push the movable blade 401 to swing away from the air outlet 101, thereby hindering the airflow from entering through the air outlet 101, thus realizing the function of automatically opening and closing the air outlet 101.

[0090] It is understood that the fixing part 400 does not necessarily have to be connected to the inner top surface 120; for example, it can also be connected to the inner side surface 111 of the front cavity 14. When the fixing part 400 is connected to the inner side surface 111, the movable blade 401 can be parallel to the thickness direction of the housing assembly 1.

[0091] The following describes an embodiment of simultaneously controlling the airflow direction of the air inlet 100 and the outlet 101.

[0092] like Figure 6 As shown, the front cavity check assembly 4 includes an inlet check 40 corresponding to the inlet 100 and an outlet check 41 corresponding to the outlet 101. The structure and installation position of the inlet check 40 and the outlet check 41 can be referred to the above.

[0093] like Figure 12aAs shown, when the vibrating plate 20 moves towards the front chamber 14 and compresses the front chamber 14, the airflow will move towards the inlet 100 and the outlet 101. The airflow moving towards the inlet 100 will push the movable blade 401 of the inlet check member 40 to swing towards the inlet 100, thereby hindering the airflow from moving towards the inlet 100. The airflow moving towards the outlet 101 will push the movable blade 401 of the outlet check member 41 to swing towards the outlet 101, thereby causing the airflow to be discharged from the outlet 101. Conversely, referring to... Figure 12b When the vibrating plate 20 moves toward the rear cavity 15, the volume of the front cavity 14 increases, generating negative pressure. The external airflow can push the movable blade 401 of the inlet check member 40 to swing away from the inlet 100, thereby opening the inlet 100. The external airflow can also push the movable blade 401 of the outlet check member 41 to swing away from the outlet 101, thereby preventing the airflow from entering from the outlet 101. This achieves the function of automatically alternating between opening and closing the inlet 100 and the outlet 101.

[0094] Thus, during the vibration of the vibrating plate 20, the front cavity check assembly 4 can simultaneously control the opening and closing of the air inlet 100 and the air outlet 101, which can effectively improve the air outlet efficiency, increase the air force, and thus improve the heat dissipation effect.

[0095] It is understandable that the movable blade 401 can be flat or curved, see... Figure 15 .

[0096] Optionally, when the movable blade 401 is flat, in a natural state (meaning without airflow disturbance), the included angle α1 between the movable blade 401 and the mounting surface of the fixed part 400 is not less than 2°, so that the airflow can reliably drive the movable blade 401 to swing.

[0097] Optionally, the airflow can drive the movable blade 401 to rotate until it contacts the vibrating plate assembly 2. For example... Figure 6 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 6In the middle, the middle surface 1a is equidistant from the first outer end surface 1120 and the second outer end surface 1121. 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.

[0098] The movable blades 401 of the inlet check valve 40 and the outlet check valve 41 are located on opposite sides of the mid-surface 1a to reliably ensure the correct swing direction of the movable blades 401. Simultaneously, due to the large distance between the inlet 100 and the outlet 101, the area for gas intake is farther than the area for gas exhaust, which is beneficial for improving heat dissipation. It can be understood that the inlet 100, the fixed end 20a of the vibrating plate 20, and the movable blades 401 of the inlet check valve 40 are located on the same side of the mid-surface 1a, while the outlet 101, the suspended end 20b of the vibrating plate 20, and the movable blades 401 of the outlet check valve 41 are located on the other side of the mid-surface 1a.

[0099] Optionally, the air inlet 100 and the air outlet 101 are respectively located on the first outer end face 1120 and the second outer end face 1121 of the housing assembly 1 (see reference numerals). Figure 7b and Figure 10 Located at both ends of the airflow channel in the front cavity 14, the airflow moves more smoothly, which is conducive to further increasing the wind power.

[0100] Alternatively, the air inlet 100 and the air outlet 101 are both located on the housing 11 and communicate with the end face 1100 of the opening end 110 of the housing 11, and the upper ends of the air inlet 100 and the air outlet 101 are covered by the cover plate 12.

[0101] Understandably, the front cavity check valve assembly 4 of the above structure occupies very little space in the thickness direction, resulting in a very compact overall structure for the micro fan, allowing it to have a small size. Theoretically, Figure 6 The miniature fan with the structure shown can be as small as 2mm in length, 2mm in width, and 1mm in thickness. Generally, the size of miniature fans can range from 2mm in length, 2mm in width, and 1mm in thickness to 10mm in length, 10mm in width, and 5mm in thickness, and larger sizes are also possible.

[0102] In some embodiments, such as Figure 13a As shown, the inlet check valve 40 and the outlet check valve 41 are two independent parts. Both the inlet check valve 40 and the outlet check valve 41 are integrally formed, for example, by punching out the movable blade 401 and the fixing part 400 from a sheet of material. Optionally, creases can be pre-formed by bending, facilitating the movable blade 401 to bend and swing around the creases. Of course, an angle can also be pre-formed between the movable blade 401 and the fixing part 400 by bending.

[0103] In some embodiments, such as Figure 13b As shown, the inlet check valve 40 and the outlet check valve 41 are integrally formed, sharing a single fixing part 400. The fixing part 400 and two movable blades 401 can be punched out from a sheet material, and an angle can be created between the movable blades 401 and the fixing part 400 by bending. This allows the front cavity check valve assembly 4 to be installed as a whole, making installation more convenient. For example, the fixing part 400 of the front cavity check valve assembly 4 can be attached to the cover plate 12, and then the cover plate 12 can be installed at the open end of the outer casing assembly 1 to complete the installation. Optionally, the outer edge of the fixing part 400 is flush with the outer edge of the cover plate 12 for easier positioning.

[0104] In some embodiments, such as Figure 14 As shown, the connecting portion 403 between the movable blade 401 and the fixing portion 400 is continuous and does not have any openwork. For example, a continuous crease or a continuous arc-shaped portion can be formed between them. In some embodiments, such as Figure 13a and Figure 13b As shown, the connection portion 403 between the movable blade 401 and the fixed portion 400 is discontinuous. For example, the two 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.

[0105] Optionally, the inlet check valve 40 and the outlet check valve 41 are made of elastic material, which can open and close the air duct through elastic deformation. The elastic material can be a metal or a non-metal, such as spring steel sheet, beryllium copper, plastic, carbon fiber, etc. In addition, the elastic material can be a non-magnetic material to avoid being affected by magnetic fields.

[0106] It is understandable that, due to the presence of the front cavity check assembly 4, setting the fixed end 20a of the vibrating plate 20 relatively close to the air outlet 101 and the suspended end 20b relatively close to the air inlet 100 can also achieve unidirectional airflow.

[0107] Example 3

[0108] Compared to Embodiment 2, the installation position of the front cavity check assembly 4 has changed in this embodiment. In this embodiment, when the vibrating plate 20 moves towards the front cavity 14, the movable blade 401 of the inlet check assembly 40 swings towards closing the inlet 100 under the action of the airflow, thus preventing the airflow from entering from the inlet 100. When the vibrating plate 20 moves towards the rear cavity 15, it swings towards opening the inlet 100 under the action of the airflow, allowing the airflow to enter the front cavity 14 from the inlet 100. When the vibrating plate 20 moves towards the front cavity 14, the movable blade 401 of the outlet check assembly 41 swings towards opening the outlet 101 under the action of the airflow, allowing the airflow to exit from the outlet 101. When the vibrating plate 20 moves towards the rear cavity 15, it swings towards closing the outlet 101 under the action of the airflow, preventing the airflow from being drawn in from the outlet 101, thereby achieving unidirectional airflow.

[0109] In some embodiments, such as Figures 16 to 17b As shown, the fixing part 400 of the inlet check member 40 is connected to the inner side 111, and the movable blade 401 of the inlet check member 40 is disposed opposite to the inlet 100. The fixing part 400 of the outlet check member 41 is connected to the outer side 112, and the movable blade 401 of the outlet check member 41 is disposed opposite to the outlet 101.

[0110] refer to Figure 17a When the vibrating plate 20 swings towards the front cavity 14, the space inside the front cavity 14 is compressed, and the airflow moves towards the inlet check valve 40 and the outlet check valve 41. This causes the movable blade 401 of the inlet check valve 40 to seal the inlet 100 under the push of the airflow, while the airflow simultaneously pushes open the movable blade 401 of the outlet check valve 41 to enter the outside. (Reference) Figure 17b When the vibrating plate 20 swings toward the rear cavity 15, a negative pressure is generated in the front cavity 14. The external airflow pushes open the movable blade 401 of the air inlet check piece 40 and enters the front cavity 14. At the same time, the external airflow pushes the movable blade 401 of the air outlet check piece 41 to seal the air outlet 101, thus realizing the function of automatically opening and closing the air inlet 100 and the air outlet 101.

[0111] Understandably, because the air inlet 100 and air outlet 101 can be closed more reliably, a better one-way airflow effect can be achieved.

[0112] It is understandable that, although the fixing part 400 of the inlet check member 40 in the figure is connected to the first inner end face 1110 and the fixing part 400 of the outlet check member 41 is connected to the second outer end face 1121, in other embodiments, the fixing parts 400 of the inlet check member 40 and the outlet check member 41 may also be connected to other surfaces.

[0113] Optionally, in some embodiments, in its natural state, the movable blade 401 can seal the corresponding air inlet 100 or air outlet 101 to more quickly close the air inlet 100 or air outlet 101. In other embodiments, in its natural state, there is a gap between the movable blade 401 and its corresponding air inlet 100 or air outlet 101. This gap can be understood as the movable blade not completely sealing the corresponding air inlet 100 or air outlet 101 in its natural state, but under the action of airflow, the movable blade 401 swings to close or open the corresponding air inlet 100 or air outlet 101, thereby achieving unidirectional airflow. For example, the movable blade 401 of the air inlet check member 40 extends from the fixed part 400 in a direction away from the inner surface 111 to form a gap. The movable blade 401 can be flat or curved.

[0114] In some embodiments, the movable blade 401 is flat. Optionally, in its natural state, the movable blade 401 of the inlet check member 40 and the outlet check member 41 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 action 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 angle between the movable blade 401 and the fixed part 400 is 0°, and both are on the same plane. At this time, the movable blade 401 of the inlet check member 40 seals the inlet 100, that is, the movable blade 401 is in contact with the inner surface 111, which can close the inlet 100 more quickly; the movable blade 401 of the outlet check member 41 seals the outlet 101, that is, the movable blade 401 is in contact with the outer surface 112, which can close the outlet 101 more quickly. Optionally, the fixing part 400 of the air inlet check member 40 is located in the rear cavity 15 to increase the contact area with the inner side 111 and ensure the connection strength. At the same time, it is not necessary to increase the thickness of the front cavity 14, which is beneficial for miniaturization.

[0115] Understandably, although Figure 16 The micro-fan is equipped with both an inlet check valve 40 and an outlet check valve 41. However, it is also possible to provide only an inlet check valve 40 or only an outlet check valve 41.

[0116] Example 4

[0117] It is understood that the vibrating plate assembly 2 does not necessarily have to be embedded inside the housing 11. This embodiment proposes another installation method for the vibrating plate assembly 2.

[0118] like Figures 18a to 19bAs shown, the vibrating plate assembly 2 is installed at the open end 110 of the housing 11, specifically connected to the end face 1100 of the open end 110. The housing assembly 1 also includes a side frame assembly 13 connected to the cover plate 12, with the vibrating plate assembly 2 connected between the open end 110 of the housing 11 and the side frame assembly 13. The side frame assembly 13 includes two side baffles 130 extending along the length direction of the housing assembly 1 and connected to the cover plate 12. The two side baffles 130 are spaced apart along the width direction of the housing assembly 1 and connected to the vibrating plate assembly 2.

[0119] A front cavity 14, an air inlet 100, and an air outlet 101 are formed between the two side baffles 130, the vibrating plate assembly 2, and the cover plate 12.

[0120] By placing the vibrating plate assembly 2 at the open end 110 of the housing 11, the area of ​​the vibrating plate 20 can be increased, thereby improving wind power. At the same time, the positional accuracy of the vibrating plate assembly 2 can be guaranteed, improving the ease of assembly.

[0121] Example 5

[0122] It is understandable that, in addition to providing an air inlet 100, an air outlet 101 and a front cavity check assembly 4 in the front cavity 14, air can also be discharged through the rear cavity 15. This embodiment describes this air discharge method.

[0123] like Figures 20 to 23 As shown, in this embodiment, the housing 11 has an air inlet and an air outlet connecting the rear cavity 15 to the outside. For ease of distinction, the air inlet connected to the rear cavity 15 is called the air inlet 102, and the air outlet connected to the rear cavity 15 is called the air outlet 103. The air inlet 102 and the air outlet 103 form a rear cavity air duct. The miniature fan also includes a rear cavity check valve assembly 5, which is connected to the housing 11 and is used to control the airflow from the air inlet 102 to the air outlet 103 in a unidirectional manner, thereby realizing the unidirectional airflow of the miniature fan and achieving heat dissipation in a small space.

[0124] Air inlet 100 and air inlet 102 are located on the same side of the middle surface 1a, while air outlet 101 and air outlet 103 are located on the other side of the middle surface 1a. Air inlet 100 and air outlet 101 are located on opposite sides of the middle surface 1a. Optionally, air inlet 100 and air inlet 102 are located at the same end of the housing assembly 1, and air outlet 101 and air outlet 103 are located at the same end of the housing assembly 1. Further optionally, air inlet 100 and air inlet 102 are located on the first outer end face 1120 of the housing assembly 1, and air outlet 101 and air outlet 103 are located on the second outer end face 1121 of the housing assembly 1.

[0125] like Figure 20 , Figure 22 and Figure 25As shown, the rear cavity check assembly 5 includes an air inlet check 50 corresponding to the air inlet 102 and an air outlet check 51 corresponding to the air outlet 103. Both the air inlet check 50 and the air outlet check 51 include a fixing part 400 connected to the housing 11 and a movable blade 401 connected to the fixing part 400.

[0126] like Figure 24a 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 24b 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.

[0127] 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, effectively improving airflow efficiency, increasing airflow force, and enhancing heat dissipation. Furthermore, the movable blades 401 all operate under the influence of airflow, eliminating the need for additional drive devices and simplifying the structure.

[0128] Obviously, during the vibration of the vibrating plate 20, the front cavity 14 can also achieve air intake and exhaust. For example... Figure 24a As shown, when the vibrating plate 20 moves towards the front chamber 14 and compresses the front chamber 14, airflow can be discharged from the air outlet 101 and drawn in from the air inlet 102. At the same time, the front chamber check valve 4 prevents airflow from being discharged from the air inlet 100, and the rear chamber check valve 5 prevents airflow from being drawn in from the air outlet 103. Figure 24b As shown, when the vibrating plate 20 moves toward the rear cavity 15 and compresses the rear cavity 15, the airflow can be drawn in from the air inlet 100 and discharged from the air outlet 103. At the same time, the front cavity check assembly 4 prevents the airflow from being drawn in from the air outlet 101, and the rear cavity check assembly 5 prevents the airflow from being discharged from the air inlet 102.

[0129] In this way, no matter which direction the vibrating plate 20 moves, either the air inlet 100 or the air inlet 102 will always be able to draw in gas, and either the air outlet 101 or the air outlet 103 will always be able to expel air. This improves the continuity of airflow and helps to further enhance heat dissipation efficiency.

[0130] 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.

[0131] Optionally, in some embodiments, in its natural state, the movable blade 401 of the air inlet check member 50 can seal the corresponding air inlet 102 to close the air inlet 102 more quickly. In other embodiments, in its natural state, there is a gap between the movable blade 401 of the air inlet check member 50 and its corresponding air inlet 102. For example, the movable blade 401 of the air inlet check member 50 extends from the fixed portion 400 in a direction away from the inner surface 111. As described above, the movable blade 401 can be flat or curved.

[0132] In some embodiments, the movable blade 401 of the air inlet check member 50 is flat. Optionally, in its natural state, the movable blade 401 of the air 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 air 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.

[0133] It is understandable that the air inlet 102 and the air inlet check 50 can be set on the first inner end face 1110 or on the side inner end face.

[0134] 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.

[0135] 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 of the outlet check member 51 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. As described above, the movable blade 401 can be flat or curved.

[0136] In some embodiments, the movable blade 401 of the outlet check member 51 is flat. Optionally, in a 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 a 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.

[0137] 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.

[0138] Understandably, the movable blade 401 does not have to be planar; for example, it can also be curved.

[0139] 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.

[0140] 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.

[0141] 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 26 In the diagram, the filler 16 is shown at the lower left and lower right corners of the housing 11.

[0142] The inlet check 40 and outlet check 41 of the rear cavity check assembly 5 are two independent parts. The inlet check 40 and outlet check 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.

[0143] In some embodiments, such as Figure 25 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.

[0144] 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.

[0145] Example 6

[0146] This embodiment proposes an electronic device that includes the miniature fan 92 described in any of the embodiments above.

[0147] Electronic devices can be portable electronic devices such as mobile phones, tablets, or chargers.

[0148] like Figure 27 and Figure 28As 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 100 and / or air outlet 102 facing the heat source 90 to quickly conduct away the heat, thus achieving heat dissipation. Alternatively, its air outlet 101 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.

[0149] 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.

[0150] 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.

[0151] In some embodiments, such as Figure 27 and Figure 28 As shown, at least one miniature fan 92 is arranged on each of the opposite sides of the heat source 90. The air inlet 100 and / or air intake 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 101 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 absorbs 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.

[0152] In some embodiments, the electronic device includes a plurality of miniature fans 92, which are connected in series. That is, in two adjacent miniature fans 92, the air inlet 100 and / or air intake 102 of one miniature fan 92 faces the air outlet 101 and / or air outlet 103 of the other miniature fan 92 (the two can be connected, for example, by a pipe). This relay-style heat dissipation allows heat to be carried away more quickly and to a greater distance. In cases where the cooling system duct is long, this ensures that the airflow does not decrease due to the length of the duct. It is understood that the miniature fans 92 may include an air inlet duct that covers all air inlets 100 and air intake 102 (if any). When multiple miniature fans 92 are connected in series, it is more convenient to simply connect the air outlet duct 80 to the air inlet duct.

[0153] 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.

[0154] 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-sized fans can be installed in a computer case, miniature fans 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.

[0155] The above are merely specific embodiments of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A miniature fan, characterized in that, include: Housing assembly (1); The vibrating plate assembly (2) is connected to the outer shell assembly (1) and divides the internal cavity of the outer shell assembly (1) into a front cavity (14) and a rear cavity (15). The vibrating plate assembly (2) includes a vibrating plate (20) with one end fixed and the other end suspended. The outer shell assembly (1) is provided with an air inlet (100) and an air outlet (101) that connect the front cavity (14) and the outside. A front cavity air duct is formed between the air inlet (100) and the air outlet (101). as well as, A drive device (3) is located in the rear cavity (15). The drive 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. The micro fan also includes a front cavity check assembly (4), which is connected to the outer shell assembly (1) and is used to control the airflow to flow unidirectionally from the air inlet (100) to the air outlet (101).

2. The miniature fan as described in claim 1, characterized in that, The front cavity check assembly (4) includes an air inlet check member (40) corresponding to the air inlet (100). The air inlet check member (40) includes a fixed part (400) connected to the outer shell assembly (1) and a movable blade (401) connected to the fixed part (400). When the vibrating plate (20) moves toward the front cavity (14), the movable blade (401) of the air inlet check member (40) swings toward closing the front cavity air passage under the action of the airflow. When the vibrating plate (20) moves toward the rear cavity (15), it swings toward opening the front cavity air passage under the action of the airflow.

3. The miniature fan as described in claim 2, characterized in that, The fixing part (400) of the air inlet check member (40) is connected to the inner surface of the front cavity (14), and the movable blade (401) of the air inlet check member (40) extends toward the side away from the mounting surface of the air inlet (100) and the fixing part (400).

4. The miniature fan as described in claim 3, characterized in that, The front cavity (14) has an inner top surface (120) that is opposite to the vibrating plate (20). The fixing part (400) of the air inlet check member (40) is connected to the inner top surface (120), and the movable blade (401) of the air inlet check member (40) extends toward the vibrating plate (20).

5. The miniature fan as described in claim 3, characterized in that, The movable blade (401) of the air inlet check valve (40) is flat, and the included angle α1 between it and the mounting surface of the fixed part (400) is not less than 2°; or, The movable blade (401) of the air inlet check valve (40) is curved.

6. The miniature fan as described in claim 1, characterized in that, The front cavity check assembly (4) includes an outlet check member (41) corresponding to the outlet (101). The outlet check member (41) includes a fixed part (400) connected to the outer shell assembly (1) and a movable blade (401) connected to the fixed part (400). When the vibrating plate (20) moves toward the front cavity (14), the movable blade (401) of the outlet check member (41) swings in the direction of opening the front cavity air passage under the action of the airflow. When the vibrating plate (20) moves toward the rear cavity (15), it swings in the direction of closing the front cavity air passage.

7. The miniature fan as described in claim 6, characterized in that, The fixing part (400) of the outlet check member (41) is connected to the inner surface of the front cavity (14), and the movable blade (401) of the outlet check member (41) extends toward the mounting surface that is close to the outlet (101) and away from the fixing part (400).

8. The miniature fan as described in claim 7, characterized in that, The outer shell assembly (1) has an inner top surface (120) exposed to the front cavity (14) and disposed opposite to the vibrating plate (20), the fixing part (400) of the outlet check member (41) is connected to the inner top surface (120), and the movable blade (401) of the outlet check member (41) extends toward the vibrating plate (20).

9. The miniature fan as described in claim 7, characterized in that, The movable blade (401) of the outlet check valve (41) is flat, and the included angle α1 between it and the mounting surface of the fixed part (400) is not less than 2°; or, The movable blade (401) of the air outlet check valve (41) is curved.

10. The miniature fan according to any one of claims 1 to 9, characterized in that, The front cavity check assembly (4) is integrally formed.

11. The miniature fan as claimed in claim 1, characterized in that, The front cavity check assembly (4) includes an inlet check member (40) corresponding to the inlet (100) and an outlet check member (41) corresponding to the outlet (101). Both the inlet check member (40) and the outlet check member (41) include a fixing part (400) connected to the outer shell assembly (1) and a movable blade (401) connected to the fixing part (400).

12. The miniature fan as described in claim 11, characterized in that, The movable blade (401) of the air inlet check valve (40) swings in the direction of closing the air inlet (100) under the action of airflow when the vibrating plate (20) moves toward the front cavity (14), and swings in the direction of opening the air inlet (100) under the action of airflow when the vibrating plate (20) moves toward the rear cavity (15). The movable blade (401) of the air outlet check piece (41) swings in the direction of opening the air outlet (101) under the action of airflow when the vibrating plate (20) moves toward the front cavity (14), and swings in the direction of closing the air outlet (101) under the action of airflow when the vibrating plate (20) moves toward the rear cavity (15).

13. The miniature fan as described in claim 12, characterized in that, The housing assembly (1) has an inner side (111) and an outer side (112). The fixing part (400) of the air inlet check member (40) is connected to the inner side (111), and the movable blade (401) of the air inlet check member (40) is arranged opposite to the air inlet (100); The fixing part (400) of the air outlet check member (41) is connected to the outer side (112), and the movable blade (401) of the air outlet check member (41) is arranged opposite to the air outlet (101).

14. The miniature fan as described in claim 13, characterized in that, The movable blade (401) of the air inlet check member (40) seals the air inlet (100) in its natural state; or, the movable blade (401) of the air inlet check member (40) has a gap with the air inlet (100) in its natural state. The movable blade (401) of the outlet check piece (41) seals the outlet (101) in its natural state; or, the movable blade (401) of the outlet check piece (41) has a gap with the outlet (101) in its natural state.

15. The miniature fan as described in claim 11, characterized in that, The outer casing assembly (1) has a mid-surface (1a) perpendicular to its length direction, and the movable blades (401) of the inlet check valve (40) and the movable blades (401) of the outlet check valve (41) are located on both sides of the mid-surface (1a).

16. The miniature fan as described in claim 15, characterized in that, The air inlet (100), the movable blade (401) of the air inlet check member (40), and the fixed end (20a) of the vibrating plate (20) are located on the same side of the middle surface (1a), while the air outlet (101), the movable blade (401) of the air outlet check member (41), and the suspended end (20b) of the vibrating plate (20) are located on the other side of the middle surface (1a).

17. The miniature fan as claimed in claim 11, characterized in that, The outer casing assembly (1) has a first outer end face (1220) and a second outer end face (1221) located at both ends in the length direction, the air inlet (100) is located on the first outer end face (1220), and the air outlet (101) is located on the second outer end face (1221).

18. The miniature fan as claimed in claim 11, 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).

19. The miniature fan as claimed in claim 1, characterized in that, The housing assembly (1) includes a housing (11) and a cover plate (12), the housing (11) having an open end (110). The vibrating plate assembly (2) is disposed inside the outer shell assembly (1), and the cover plate (12) seals the opening end (110); or, The housing assembly (1) further includes a side frame assembly (13) connected to the cover plate (12). The vibrating plate assembly (2) is connected between the opening end (110) of the housing assembly (1) and the side frame assembly (13). The side frame assembly (13) includes two side bars (130) connected to the cover plate (12) and extending along the length direction of the housing assembly (1). The two side bars (130) are spaced apart along the width direction of the housing assembly (1) and connected to the vibrating plate assembly (2).

20. The miniature fan as described in claim 19, characterized in that, The front cavity check assembly (4) is integrally formed and is attached to the cover plate (12).

21. The miniature fan as claimed in claim 1, characterized in that, The fixed end (20a) of the vibrating plate (20) is closer to the air inlet (100) than its suspended end (20b), and the suspended end (20b) of the vibrating plate (20) is closer to the air outlet (101) than its fixed end (20a).

22. The miniature fan as described in claim 1, characterized in that, The vibrating plate assembly (2) includes an annular frame (21) connected to the outer shell assembly (1), and the vibrating plate (20) is disposed inside the annular frame (21) with one end of its length direction connected 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.

23. The miniature fan as described 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).

24. The miniature fan as described in any one of claims 1 to 9, 11 to 23, characterized in that, The outer casing assembly (1) includes an air inlet (102) and an air outlet (103) that connect the rear cavity (15) and the outside. The air inlet (102) and the air inlet (100) are located at the same end of the outer casing assembly (1), and the air outlet (103) and the air outlet (101) are located at the same end of the outer casing assembly (1). The micro fan also includes a rear cavity check valve assembly (5) connected to the outer casing assembly (1) for controlling the airflow to flow unidirectionally from the air inlet (102) to the air outlet (103).

25. The miniature fan as described in claim 24, 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).

26. The miniature fan as described in claim 25, characterized in that, The outer casing assembly (1) has an inner side surface (111), 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 arranged opposite to the air inlet (102); 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).

27. The miniature fan as described in claim 26, characterized in that, The movable blade (401) of the air inlet check valve (50) covers the air inlet (102) in its natural state. The movable blade (401) of the air outlet check valve (51) covers the air outlet (103) in its natural state.

28. An electronic device, characterized in that, Including the miniature fan as described in any one of claims 1 to 27.

29. The electronic device as claimed in claim 28, 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).

Images