A micro flexoelectric fan and method of use

Abstract

The application relates to the technical field of micro fans and micro electro mechanical systems, and discloses a micro flexoelectric fan and a use method, wherein a first soft rubber ring is arranged on a first shell, a second soft rubber ring is arranged on a second shell, and a flexoelectric ceramic sheet is clamped between the first soft rubber ring and the second soft rubber ring; a first cavity is formed between the flexoelectric ceramic sheet and the first shell, and a second cavity is formed between the flexoelectric ceramic sheet and the second shell; a group of wires is clamped between the flexoelectric ceramic sheet and the first soft rubber ring through the first shell, and another group of wires is clamped between the flexoelectric ceramic sheet and the second soft rubber ring through the second shell; the first shell and the second shell are respectively provided with air inlet units and air outlet units, and are used for realizing one-way ventilation. The application is more favorable for realizing low-voltage driving and low-power consumption operation under the condition of sub-millimeter ultra-thin size, and lays a structural foundation for improving air volume and heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to the field of micro fans and microelectromechanical systems (MEMS), specifically to a micro flexural electric fan and its usage method. Background Technology

[0002] As electronic devices continue to evolve towards higher performance and miniaturization, the integration and power density of devices are constantly increasing. This has led to increasingly prominent localized hotspot issues, which have become key factors restricting the performance, reliability, and lifespan of electronic devices. In the confined installation spaces of power amplifiers, microprocessors, and other devices, the need for efficient heat dissipation structures is becoming increasingly urgent.

[0003] Traditional axial fans, as the mainstream active cooling device, are limited by motor size, blade structure and assembly space, making it difficult to achieve further miniaturization and ultrathinning. Their practical application is constrained by three factors: power density, miniaturization degree and operating noise, and cannot meet the high-efficiency heat dissipation requirements of micro-nano scale electronic devices.

[0004] Existing micro fans mostly employ piezoelectric effect-based driving schemes. For example, the invention patent CN117927504A (a constant amplitude piezoelectric fan) and the utility model patent CN223781627U (a pump structure for a piezoelectric fan) both utilize piezoelectric materials to excite and oscillate the fan blades, achieving airflow disturbance and heat dissipation. However, in the process of miniaturization and ultra-thinning, the driving capability of piezoelectric materials is positively correlated with device size: when the device thickness is reduced to the sub-millimeter level, the deformation capability of the piezoelectric material decreases significantly. Higher driving voltages are typically required to achieve the structural deformation necessary for heat dissipation, leading to increased power consumption and reduced driving efficiency, making it difficult to effectively balance ultra-thin size and low-power driving. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention aims to provide a miniature flexible electric fan and a method of using it, so as to solve the technical problems of how to achieve an ultra-thin structure, low driving voltage and low power consumption of a miniature cooling fan.

[0006] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a miniature flexible electric fan, comprising a first housing, a first soft rubber ring, a flexible electric ceramic sheet, a second soft rubber ring, a second housing, and two sets of wires; The first soft rubber ring is disposed on the first housing, the second soft rubber ring is disposed on the second housing, and the flexoelectric ceramic sheet is sandwiched between the first soft rubber ring and the second soft rubber ring; wherein the flexoelectric ceramic sheet and the first housing form a first cavity, and the flexoelectric ceramic sheet and the second housing form a second cavity; One set of wires is clamped between the flexoelectric ceramic sheet and the first soft rubber ring through the first housing, and another set of wires is clamped between the flexoelectric ceramic sheet and the second soft rubber ring through the second housing. This is used to apply an AC voltage to the flexoelectric ceramic sheet, causing the flexoelectric ceramic sheet to bend and deform within the first and second cavities. The first housing and the second housing are respectively provided with an air inlet unit and an air outlet unit, wherein the position of the air inlet unit of the first housing corresponds to the position of the air outlet unit of the second housing; the position of the air outlet unit of the first housing corresponds to the position of the air inlet unit of the second housing, for the purpose of realizing unidirectional ventilation.

[0007] Preferably, the air inlet unit of the first housing includes a first air inlet disposed on the first housing and a first air inlet valve cover disposed on the surface of the first housing near the flexible electric ceramic sheet corresponding to the position of the first air inlet. One end of the first air inlet valve cover is fixed to the first housing, and the other end is a free end, which is used to guide the gas into the housing after passing through the first air inlet. The air outlet unit of the first housing includes a first air outlet disposed on the first housing and a first air outlet valve cover disposed on the surface of the first housing opposite to the flexible electric ceramic sheet, corresponding to the position of the first air outlet. One end of the first air outlet valve cover is fixed to the first housing, and the other end is a free end, which is used to guide the gas to be discharged after passing through the first air outlet.

[0008] Furthermore, the first housing has a first air inlet groove on the surface near the flexible ceramic sheet, the first air inlet is disposed in the first air inlet groove, one end of the first air inlet groove has a first fixing groove, and one end of the first air inlet valve cover is fixedly bonded to the first fixing groove, wherein the size of the first air inlet groove corresponds to the size of the first air inlet valve cover. The first housing has a first air outlet groove on the surface away from the flexible ceramic sheet. The first air outlet is located in the first air outlet groove. A third fixing groove is provided at one end of the first air outlet groove. One end of the first air outlet valve cover is fixedly bonded to the third fixing groove. The size of the first air outlet groove corresponds to the size of the first air outlet valve cover.

[0009] Preferably, the first housing has a first annular groove along the circumferential direction on the surface near the flexural ceramic sheet side, and the first soft rubber ring is sleeved on the first annular groove, wherein the outer diameter of the first housing corresponds to the outer diameter of the first soft rubber ring.

[0010] Preferably, a first through hole is provided on one side of the first housing, and a third through hole is provided on the first soft rubber ring at the position corresponding to the first through hole; one end of a set of wires is clamped between the flexural ceramic sheet and the first soft rubber ring through the first through hole and the third through hole in sequence.

[0011] Preferably, the air inlet unit of the second housing includes a second air inlet disposed on the second housing and a second air inlet valve cover disposed on the surface of the second housing near the flexible electric ceramic sheet corresponding to the position of the second air inlet. One end of the second air inlet valve cover is fixed to the second housing, and the other end is a free end, which is used to guide the gas into the housing after passing through the second air inlet. The air outlet unit of the second housing includes a second air outlet disposed on the second housing and a second air outlet valve cover disposed on the surface of the second housing opposite to the flexural ceramic sheet, corresponding to the position of the second air outlet; one end of the second air outlet valve cover is fixed on the second housing, and the other end is a free end, which is used to guide the gas to be discharged after passing through the second air outlet.

[0012] Furthermore, a second air inlet groove is provided on the surface of the second housing near the flexible electric ceramic sheet. The second air inlet is located in the second air inlet groove. A second fixing groove is provided at one end of the second air inlet groove. One end of the second air inlet valve cover is fixedly bonded to the second fixing groove. The size of the second air inlet groove corresponds to the size of the second air inlet valve cover. The second housing has a second air outlet groove on the surface away from the flexural ceramic sheet. The second air outlet is located in the second air outlet groove. One end of the second air outlet groove has a fourth fixing groove. One end of the second air outlet valve cover is fixedly bonded to the fourth fixing groove. The size of the second air outlet groove corresponds to the size of the second air outlet valve cover.

[0013] Preferably, the second housing has a second annular groove along the circumferential direction on the surface near the flexural ceramic sheet side, and the second soft rubber ring is sleeved on the second annular groove, wherein the outer diameter of the second housing corresponds to the outer diameter of the second soft rubber ring.

[0014] Preferably, a second through hole is provided on one side of the second housing, and a fourth through hole is provided on the second soft rubber ring at the position corresponding to the second through hole. One end of a set of wires is clamped between the flexural ceramic sheet and the second soft rubber ring through the second through hole and the fourth through hole in sequence.

[0015] Secondly, the present invention also provides a method of using a miniature flexible electric fan, based on the miniature flexible electric fan described above, comprising the following process: When an AC voltage is applied to the flexoelectric ceramic sheet through two sets of wires, the flexoelectric ceramic sheet undergoes bending deformation under the action of the reverse flexoelectric effect. When the flexoelectric ceramic sheet bends upward, the volume of the first cavity decreases and the pressure increases, and the air outlet unit of the first shell opens to exhaust air. At the same time, the volume of the second cavity increases and the pressure decreases, and the air inlet unit of the second shell opens to draw air in. When the flexoelectric ceramic sheet bends downward, the volume of the first cavity increases and the pressure decreases, and the air inlet unit of the first shell opens to draw air in. At the same time, the volume of the second cavity decreases and the pressure increases, and the air outlet unit of the second shell opens to exhaust air, thereby realizing the alternating air outlet of the first and second cavities.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a miniature flexural electric fan, which consists of a first housing, a first soft rubber ring, a flexural ceramic sheet, a second soft rubber ring, a second housing, and two sets of wires forming an overall structure. The flexural ceramic sheet is sandwiched between the first and second soft rubber rings to form a first cavity and a second cavity. It is combined with an air inlet unit and an air outlet unit that are staggered between the upper and lower housings. Using flexural material as the core driving component, it achieves an ultra-thin and miniaturized design. It can drive airflow by generating bending deformation through the inverse flexural effect in a small size. Compared with the traditional piezoelectric driving method, it is more conducive to achieving low-voltage driving and low-power operation in a sub-millimeter-thin size. At the same time, the dual-cavity and unidirectional ventilation structure lays the structural foundation for improving air volume and heat dissipation efficiency.

[0017] Furthermore, by setting an air inlet unit and an air outlet unit with a valve cover on the first housing respectively, the valve cover adopts a structure with one end fixed and the other end free, which can automatically open and close when the cavity pressure changes, forming a reliable unidirectional airflow channel, avoiding airflow backflow, ensuring stable and orderly air intake and exhaust processes, further improving ventilation efficiency and air volume, and enabling the fan to achieve continuous and stable directional airflow output under the reciprocating bending deformation of the flexural ceramic plate.

[0018] Furthermore, by setting an air inlet groove and an air outlet groove on the corresponding side surface of the first housing, and setting a fixing groove in the groove for bonding and fixing the valve cover, the valve cover can be installed flat and snugly, ensuring the flexibility and sealing of the valve cover opening and closing. At the same time, the groove structure can provide reasonable space for the valve cover to swing, avoid interference with the movement of the valve cover, improve the working reliability of the valve plate, and thus ensure smooth and stable air intake and exhaust processes, improving the overall working performance of the fan.

[0019] Furthermore, an annular groove is provided on the surface of the first housing near the flexural ceramic sheet. The first soft rubber ring is fitted into the annular groove to achieve rapid assembly and circumferential positioning of the first soft rubber ring, ensuring assembly accuracy and structural stability. At the same time, the soft rubber ring forms flexible support and sealing, reducing energy loss of the flexural ceramic sheet during vibration, increasing deformation amplitude, enhancing driving efficiency, and increasing air volume output under the same driving conditions.

[0020] Furthermore, by providing through holes on the first housing and the first soft rubber ring respectively, a group of wires can pass through the through holes in sequence and be clamped between the flexible ceramic sheet and the first soft rubber ring, so as to achieve neat wiring and reliable electrical connection of the wires, avoid wires from loosening or poor contact, ensure stable application of driving voltage, and at the same time, the wiring structure is compact and does not occupy extra space, which is conducive to maintaining the overall miniaturization and ultra-thin structure of the fan.

[0021] Furthermore, by setting an air inlet unit and an air outlet unit on the second housing that cooperate with the first housing, both the air inlet and the air outlet are equipped with a valve cover structure that is fixed at one end and free at the other end. Working in conjunction with the valve cover structure of the first housing, synchronous and reverse air intake and exhaust actions are achieved when the pressure of the upper and lower cavities changes alternately, thereby enhancing the unidirectional ventilation effect, avoiding airflow turbulence and backflow, and enabling the fan to achieve continuous air output within one vibration cycle, significantly improving the overall ventilation volume and heat dissipation efficiency.

[0022] Furthermore, by setting an air inlet groove and an air outlet groove on the corresponding side surface of the second housing, and setting a fixing groove in the groove for bonding and fixing the valve cover, the valve cover is installed flat and moves smoothly, ensuring good conductivity and sealing effect, reducing gas leakage, improving the response speed of cavity pressure changes, thereby improving the working efficiency of the fan under low driving voltage and enhancing the air volume output capability under miniaturized structure.

[0023] Furthermore, by setting an annular groove along the circumferential direction on the surface of the second housing near the flexure ceramic sheet, the second soft rubber ring is fitted into the annular groove, achieving precise assembly and circumferential positioning of the second soft rubber ring. Together with the first soft rubber ring, they form a flexible hinge structure, reducing vibration damping and energy loss, improving the vibration efficiency of the flexure ceramic sheet, and enabling the fan to achieve greater deformation and higher airflow even under low power consumption.

[0024] Furthermore, by providing through holes on the second housing and the second soft rubber ring respectively, another set of wires can pass smoothly through and be clamped between the flexible ceramic sheet and the second soft rubber ring, so as to achieve stable lead-out of the double-sided electrodes, ensure reliable application of AC voltage, and make the wiring simple and compact, which is conducive to improving the overall structure and assembly convenience, while not increasing the overall thickness of the fan and maintaining the advantages of ultra-thin structure.

[0025] This invention also provides a method for using a miniature flexural electric fan. By applying an AC voltage to the flexural ceramic sheet, it causes the sheet to bend and deform upwards and downwards under the reverse flexural effect. This causes the first and second cavities to alternately change in volume and pressure. Combined with the unidirectional opening and closing of the air inlet and outlet units of the upper and lower shells, the upper and lower cavities alternately draw in and exhaust air, completing continuous airflow within one vibration cycle. This fully utilizes the size dependence of the flexural effect, achieving low voltage and low power consumption drive in an ultra-thin size, while effectively avoiding airflow backflow, improving ventilation efficiency and air volume output. From the working principle level, this invention solves the technical problem that traditional miniature fans cannot simultaneously achieve ultra-thin size, low drive voltage, and low power consumption. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the flexural fan in an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view along the AA direction; Figure 3 This is a schematic diagram of the exploded disintegration structure of the flexural fan in an embodiment of the present invention; Figure 4 This is a schematic diagram of the shell structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the housing with valve cover in an embodiment of the present invention; Figure 6 This is a schematic diagram of the soft adhesive layer assembly in an embodiment of the present invention; Figure 7 This is a schematic diagram of the assembly of the flexural ceramic sheet in an embodiment of the present invention; Figure 8 This is a top view of the housing in an embodiment of the present invention; Figure 9 This is a bottom view of the housing in an embodiment of the present invention; Figure 10 This is a schematic diagram illustrating the working principle of the first air outlet of the flexural electric fan in an embodiment of the present invention. Figure 11 This is a schematic diagram illustrating the working principle of the second air outlet of the flexural fan in an embodiment of the present invention. In the diagram: 1. First housing; 2. First soft rubber ring; 3. Flexible electroceramic sheet; 4. Second soft rubber ring; 5. Second housing; 6. Wire; 7. First air inlet; 8. First air outlet valve cover; 9. First air inlet valve cover; 10. Second air inlet valve cover; 11. Second air outlet valve cover; 12. First annular groove; 13. First air outlet; 14. First air inlet groove; 15. Second annular groove; 16. Second air outlet; 17. Second air inlet groove; 18. First through hole; 19. First fixing groove; 20. Second air inlet; 21. Second through hole; 22. Second fixing groove; 23. Third through hole; 24. Fourth through hole; 25. Third fixing groove; 26. First air outlet groove; 27. Fourth fixing groove; 28. Second air outlet groove; 29. ​​First cavity; 30. Second cavity. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] The purpose of this invention is to provide a miniature flexible electric fan and a method of using it, so as to solve the technical problems of how to achieve an ultra-thin structure, low driving voltage, and low power consumption of a miniature cooling fan.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 as well as Figure 9 In one embodiment of the present invention, a miniature flexible electric fan is provided, including a first housing 1, a first soft rubber ring 2, a flexible electric ceramic sheet 3, a second soft rubber ring 4, a second housing 5, and two sets of wires 6. The components are assembled together to form a complete fan body, realizing an ultra-thin, low-power active heat dissipation function.

[0030] The first soft rubber ring 2 is disposed on the first housing 1. Specifically, the surface of the first housing 1 near the flexible ceramic sheet 3 is provided with a first annular groove 12 along the circumferential direction. The first soft rubber ring 2 is sleeved on the first annular groove 12, and the outer diameter of the first housing 1 corresponds to the outer diameter of the first soft rubber ring 2. The first annular groove 12 enables the quick assembly and circumferential positioning of the first soft rubber ring 2, while ensuring the structural integrity after assembly and preventing the soft rubber ring from shifting circumferentially.

[0031] The second soft rubber ring 4 is disposed on the second housing 5, and its assembly method is the same as that of the first soft rubber ring 2: The second housing 5 has a second annular groove 15 along the circumferential direction on the surface near the flexural ceramic sheet 3. The second soft rubber ring 4 is sleeved on the second annular groove 15, and the outer diameter of the second housing 5 corresponds to the outer diameter of the second soft rubber ring 4. Together with the first soft rubber ring 2, they form a flexible clamping and hinged fixing structure for the flexural ceramic sheet 3, which effectively reduces vibration energy loss.

[0032] The flexural ceramic sheet 3 is sandwiched between the first soft rubber ring 2 and the second soft rubber ring 4. The flexural ceramic sheet 3 is prepared from niobium-doped barium titanate ceramic powder material with high dielectric constant and high impedance characteristics, wherein the niobium doping ratio is 1%. The overall shape of the element is a circular thin sheet with a thickness of 100 micrometers, belonging to the sub-millimeter-level ultra-thin structure, which can fully utilize the size dependence of the flexural effect to achieve low-voltage, low-power drive. Metal electrodes made of silver are coated on the surface of the flexural ceramic sheet 3 using a screen printing process. The electrodes completely cover the upper and lower surfaces of the flexural ceramic sheet 3, and are used to receive the driving voltage and generate the reverse flexural effect. A first cavity 29 is formed between the flexural ceramic sheet 3 and the first housing 1, and a second cavity 30 is formed between the flexural ceramic sheet 3 and the second housing 5. The two cavities provide space for airflow intake and exhaust, realizing alternating ventilation.

[0033] Two sets of wires 6 are used to apply AC voltage to the flexible ceramic sheet 3, and their assembly method is as follows: A set of wires 6 is clamped between the flexible ceramic sheet 3 and the first soft rubber ring 2 through the first housing 1. Specifically, a first through hole 18 is provided on one side of the first housing 1, and a third through hole 23 is provided on the first soft rubber ring 2 at the position corresponding to the first through hole 18. One end of the set of wires 6 passes through the first through hole 18 and the third through hole 23 in sequence, and is finally clamped between the flexible ceramic sheet 3 and the first soft rubber ring 2, so as to achieve a stable electrical connection with the electrode on the upper surface of the flexible ceramic sheet 3. Another set of wires 6 is clamped between the flexural ceramic plate 3 and the second soft rubber ring 4 through the second housing 5. Specifically, a second through hole 21 is provided on one side of the second housing 5, and a fourth through hole 24 is provided on the second soft rubber ring 4 at the position corresponding to the second through hole 21. One end of this set of wires 6 passes through the second through hole 21 and the fourth through hole 24 in sequence, clamping between the flexural ceramic plate 3 and the second soft rubber ring 4, and achieving a stable electrical connection with the electrode on the lower surface of the flexural ceramic plate 3. The other ends of the two sets of wires 6 extend to the outside of the fan for connecting to an external AC signal source to achieve a stable input of the driving voltage.

[0034] The first through hole 18, the third through hole 23, the second through hole 21, and the fourth through hole 24 are positioned vertically to form a through channel for the wire 6 to pass through, ensuring neat wiring, not occupying extra space, and maintaining the miniaturized and ultra-thin structure of the fan.

[0035] The first housing 1 and the second housing 5 are respectively provided with an air inlet unit and an air outlet unit, wherein the position of the air inlet unit of the first housing 1 corresponds to the position of the air outlet unit of the second housing 5, and the position of the air outlet unit of the first housing 1 corresponds to the position of the air inlet unit of the second housing 5, so as to realize unidirectional ventilation, avoid airflow backflow, and improve ventilation efficiency.

[0036] Specifically, the air inlet unit of the first housing 1 includes a first air inlet 7 disposed on the first housing 1 and a first air inlet valve cover 9 disposed on the surface of the first housing 1 near the flexible electro-ceramic sheet 3, corresponding to the position of the first air inlet 7. One end of the first air inlet valve cover 9 is fixed to the first housing 1, and the other end is a free end, used to guide gas in after passing through the first air inlet 7. To ensure the assembly stability and movement flexibility of the first air inlet valve cover 9, a first air inlet groove 14 is provided on the surface of the first housing 1 near the flexible electro-ceramic sheet 3. The first air inlet 7 is disposed in the first air inlet groove 14. One end of the first air inlet groove 14 is provided with a first fixing groove 19. One end of the first air inlet valve cover 9 is fixedly bonded to the first fixing groove 19. The size of the first air inlet groove 14 corresponds to the size of the first air inlet valve cover 9, which can achieve a flat and close fit of the first air inlet valve cover 9 and provide sufficient space for its free end to swing, avoiding movement interference.

[0037] The air outlet unit of the first housing 1 includes a first air outlet 13 disposed on the first housing 1 and a first air outlet valve cover 8 disposed on the surface of the first housing 1 opposite to the flexible electric ceramic sheet 3, corresponding to the position of the first air outlet 13. One end of the first air outlet valve cover 8 is fixed to the first housing 1, and the other end is a free end, used to guide the gas to be discharged after passing through the first air outlet 13. Its assembly structure corresponds to the air inlet unit: a first air outlet groove 26 is provided on the surface of the first housing 1 opposite to the flexible electric ceramic sheet 3, the first air outlet 13 is disposed in the first air outlet groove 26, a third fixing groove 25 is provided at one end of the first air outlet groove 26, and one end of the first air outlet valve cover 8 is fixedly bonded to the third fixing groove 25. The size of the first air outlet groove 26 corresponds to the size of the first air outlet valve cover 8, ensuring that the first air outlet valve cover 8 can be opened and closed flexibly and is reliably sealed.

[0038] The air inlet unit of the second housing 5 has the same structure and works in conjunction with the air inlet unit of the first housing 1. It includes a second air inlet 20 disposed on the second housing 5 and a second air inlet valve cover 10 disposed on the surface of the second housing 5 near the flexible electric ceramic sheet 3, corresponding to the position of the second air inlet 20. One end of the second air inlet valve cover 10 is fixed to the second housing 5, and the other end is a free end, used to guide gas into the housing after it passes through the second air inlet 20. The corresponding assembly structure is as follows: The second housing 5 has a second air inlet groove 17 on the surface near the flexural ceramic sheet 3. The second air inlet 20 is located in the second air inlet groove 17. One end of the second air inlet groove 17 has a second fixing groove 22. One end of the second air inlet valve cover 10 is fixedly bonded to the second fixing groove 22. The size of the second air inlet groove 17 corresponds to the size of the second air inlet valve cover 10.

[0039] The air outlet unit of the second housing 5 has the same structure and works in conjunction with the air outlet unit of the first housing 1. It includes a second air outlet 16 disposed on the second housing 5 and a second air outlet valve cover 11 disposed on the surface of the second housing 5 opposite to the flexible ceramic sheet 3, corresponding to the position of the second air outlet 16. One end of the second air outlet valve cover 11 is fixed to the second housing 5, and the other end is a free end, used to guide and discharge gas after it passes through the second air outlet 16. The corresponding assembly structure is as follows: The second housing 5 has a second air outlet groove 28 on the surface away from the flexural ceramic sheet 3. The second air outlet 16 is located in the second air outlet groove 28. One end of the second air outlet groove 28 has a fourth fixing groove 27. One end of the second air outlet valve cover 11 is fixedly bonded to the fourth fixing groove 27. The size of the second air outlet groove 28 corresponds to the size of the second air outlet valve cover 11.

[0040] In this embodiment, the first soft rubber ring 2 and the second soft rubber ring 4 are made of fatigue-resistant silicone rubber. The outer diameters of the first soft rubber ring 2 and the second soft rubber ring 4 correspond to the outer diameter of the flexural ceramic sheet 3. The first soft rubber ring 2 and the second soft rubber ring 4 work together to form an elastic hinged fixing structure, which can effectively reduce the energy loss of the flexural ceramic sheet 3 during vibration, increase its amplitude, and improve the air volume output per unit power consumption.

[0041] In this embodiment, the first air inlet valve cover 9, the first air outlet valve cover 8, the second air inlet valve cover 10, and the second air outlet valve cover 11 are made of stainless steel, which has high fatigue life and high temperature and humidity resistance. They open when the airflow is flowing in the forward direction and close when the airflow is flowing in the reverse direction, effectively preventing airflow backflow and further improving ventilation efficiency.

[0042] In this embodiment, the flexural ceramic sheet 3 is prepared from hard ferroelectric ceramic powder materials such as niobium- or tantalum-doped barium titanate and barium strontium titanate, which have high dielectric constant and high impedance characteristics. The overall shape of the element is a circular thin sheet, wherein the doping ratio of niobium or tantalum is 0% to 5%, and the overall shape of the element is a circular thin sheet with a thickness of 1 micrometer to 200 micrometers. The flexural ceramic sheet 3 can undergo forced vibration based on the inverse flexural effect through the AC signal applied by the wire 6.

[0043] Furthermore, by adjusting the diameter of the flexural ceramic plate 3, the resonant frequency of the flexural ceramic plate 3 can be changed, thereby adjusting the operating frequency and airflow of the miniature flexural fan to suit the heat dissipation needs of different microelectronic devices.

[0044] Example 2 This embodiment also provides a method for using a miniature flexible electric fan, based on the miniature flexible electric fan described above, including the following process: The first step is to connect the free ends of the two sets of wires 6 to an external AC signal source. The external AC signal source should include a sine wave signal generation circuit, a power amplifier circuit, a frequency adjustment circuit, etc., to provide a stable sine wave AC voltage for the flexural ceramic sheet 3. The AC voltage can be expressed in the form of V(t) = V0sin(ωt), where V0 is the voltage amplitude and ω is the angular frequency, which can be adjusted by the external circuit according to the actual heat dissipation requirements.

[0045] The second step involves applying the aforementioned alternating voltage to the upper and lower surface electrodes of the flexoelectric ceramic sheet 3 via two sets of wires 6. Under the influence of the inverse flexoelectric effect, the flexoelectric ceramic sheet 3 generates non-uniform strain, i.e., a strain gradient along the thickness direction. According to the inverse flexoelectric constitutive relation, the strain gradient and the electric field strength satisfy the following: ε / x = μ·E, where μ is the inverse flexural coefficient and E is the electric field strength. Since the hinged fixing method formed by the first soft rubber ring 2 and the second soft rubber ring 4 allows the edge of the flexural ceramic sheet 3 to produce a certain angular displacement, the flexural ceramic sheet 3 will produce periodic bending deformation under the periodic drive of the alternating electric field. Its amplitude is proportional to the driving voltage amplitude V0 and the inverse flexural coefficient μ.

[0046] Thirdly, the periodic bending deformation of the flexural ceramic sheet 3 causes alternating changes in volume and pressure in the first cavity 29 and the second cavity 30, which in turn drives the valve covers of each air inlet unit and air outlet unit to open and close alternately, achieving unidirectional ventilation and alternating air outlet: according to Figure 10 As shown, when the flexoelectric ceramic plate 3 bends upward, it moves closer to the first housing 1, causing the volume of the first cavity 29 to decrease and the internal pressure to increase. At this time, the first air outlet 13 and the first air outlet valve cover 8 of the first housing 1 open under the pressure, and the gas in the first cavity 29 is guided to be discharged through the first air outlet 13. At the same time, the flexoelectric ceramic plate 3 moves away from the second housing 5, causing the volume of the second cavity 30 to increase and the internal pressure to decrease. At this time, the second air inlet 20 and the second air inlet valve cover 10 of the second housing 5 open under the pressure difference, and the external gas is guided into the second cavity 30 through the second air inlet 20.

[0047] according to Figure 11 As shown, when the flexoelectric ceramic plate 3 bends downward, it moves closer to the second housing 5, causing the volume of the second cavity 30 to decrease and the internal pressure to increase. At this time, the second air outlet 16 and the second air outlet valve cover 11 of the second housing 5 open under the action of pressure, and the gas in the second cavity 30 is guided to be discharged through the second air outlet 16. At the same time, the flexoelectric ceramic plate 3 moves away from the first housing 1, causing the volume of the first cavity 29 to increase and the internal pressure to decrease. At this time, the first air inlet 7 and the first air inlet valve cover 9 of the first housing 1 open under the action of pressure difference, and the external gas is guided into the first cavity 29 through the first air inlet 7.

[0048] In the fourth step, as the AC voltage is continuously applied, the flexural ceramic sheet 3 undergoes continuous up-and-down periodic bending deformation. The first cavity 29 and the second cavity 30 alternately complete the intake and exhaust actions, realizing alternating airflow. Within a complete vibration cycle, a continuous and stable directional airflow is generated, thereby providing efficient active heat dissipation for microelectronic devices.

[0049] The method of use in this embodiment makes full use of the size dependence of the flexoelectric effect, enabling the sub-millimeter-thin flexoelectric ceramic sheet 3 to generate sufficient bending deformation under low voltage drive, thereby achieving low power consumption operation. At the same time, through the design of alternating air outlet of dual chamber and one-way valve cover, airflow backflow is effectively avoided, significantly improving ventilation efficiency and air volume output, and perfectly solving the technical problem that traditional micro fans cannot take into account the difficulty of achieving ultra-thin structure, low drive voltage and low power consumption.

[0050] In summary, the miniature flexible electric fan and its usage method provided by this invention utilize the size dependence of the flexoelectric effect, employing a flexoelectric ceramic circular sheet with a thickness controlled within 200 micrometers as the core driving element. This achieves a balance between miniaturization, low power consumption, and high driving capability, resolving the contradiction between ultra-thin size and driving performance inherent in traditional fans. This invention uses a hinged fixing method formed by a soft adhesive layer instead of traditional rigid fixing, effectively reducing vibration energy loss and increasing the amplitude of the flexoelectric ceramic sheet, thereby significantly improving airflow output per unit power consumption. The invention employs an upper and lower dual-cavity structure and a one-way valve cover design, allowing alternating air intake and exhaust within one vibration cycle, effectively preventing airflow backflow and significantly improving ventilation efficiency and working airflow. This invention achieves rapid assembly and circumferential positioning of the vibrating component through an annular groove and neat wiring through corresponding through holes, resulting in a compact structure, simple assembly, and good manufacturability and maintainability.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A miniature flexible electric fan, characterized in that, It includes a first housing (1), a first soft rubber ring (2), a flexible ceramic sheet (3), a second soft rubber ring (4), a second housing (5), and two sets of wires (6); The first soft rubber ring (2) is disposed on the first housing (1), the second soft rubber ring (4) is disposed on the second housing (5), and the flexible electric ceramic sheet (3) is sandwiched between the first soft rubber ring (2) and the second soft rubber ring (4); wherein the flexible electric ceramic sheet (3) and the first housing (1) form a first cavity (29), and the flexible electric ceramic sheet (3) and the second housing (5) form a second cavity (30); One set of wires (6) is clamped between the flexural ceramic sheet (3) and the first soft rubber ring (2) through the first housing (1), and another set of wires (6) is clamped between the flexural ceramic sheet (3) and the second soft rubber ring (4) through the second housing (5). This is used to apply an AC voltage to the flexural ceramic sheet (3) so that the flexural ceramic sheet (3) bends and deforms within the first cavity (29) and the second cavity (30). The first housing (1) and the second housing (5) are respectively provided with an air inlet unit and an air outlet unit, wherein the position of the air inlet unit of the first housing (1) corresponds to the position of the air outlet unit of the second housing (5); the position of the air outlet unit of the first housing (1) corresponds to the position of the air inlet unit of the second housing (5), which is used to realize unidirectional ventilation.

2. A miniature flexible electric fan according to claim 1, characterized in that, The air inlet unit of the first housing (1) includes a first air inlet (7) disposed on the first housing (1) and a first air inlet valve cover (9) disposed on the surface of the first housing (1) near the flexible electric ceramic sheet (3) corresponding to the position of the first air inlet (7). One end of the first air inlet valve cover (9) is fixed on the first housing (1), and the other end is a free end, which is used to guide the gas into the first air inlet (7) after it passes through the first air inlet (7). The air outlet unit of the first housing (1) includes a first air outlet (13) disposed on the first housing (1) and a first air outlet valve cover (8) disposed on the surface of the first housing (1) away from the flexible electric ceramic sheet (3) corresponding to the position of the first air outlet (13). One end of the first air outlet valve cover (8) is fixed on the first housing (1), and the other end is a free end, which is used to guide the gas to be discharged after passing through the first air outlet (13).

3. A miniature flexible electric fan according to claim 2, characterized in that, The first housing (1) has a first air inlet groove (14) on the surface near the flexible electric ceramic sheet (3), the first air inlet (7) is located in the first air inlet groove (14), one end of the first air inlet groove (14) has a first fixing groove (19), and one end of the first air inlet valve cover (9) is fixedly bonded to the first fixing groove (19), wherein the size of the first air inlet groove (14) corresponds to the size of the first air inlet valve cover (9); The first housing (1) has a first air outlet groove (26) on the surface away from the flexible ceramic sheet (3). The first air outlet (13) is located in the first air outlet groove (26). A third fixing groove (25) is provided at one end of the first air outlet groove (26). One end of the first air outlet valve cover (8) is fixedly bonded to the third fixing groove (25). The size of the first air outlet groove (26) corresponds to the size of the first air outlet valve cover (8).

4. A miniature flexible electric fan according to claim 1, characterized in that, The first housing (1) has a first annular groove (12) along the circumferential direction on the surface near the flexural ceramic sheet (3), and the first soft rubber ring (2) is fitted on the first annular groove (12), wherein the outer diameter of the first housing (1) corresponds to the outer diameter of the first soft rubber ring (2).

5. A miniature flexible electric fan according to claim 1, characterized in that, The first housing (1) has a first through hole (18) on one side, and the first soft rubber ring (2) has a third through hole (23) at the position corresponding to the first through hole (18); one end of a set of wires (6) is held between the flexible ceramic sheet (3) and the first soft rubber ring (2) through the first through hole (18) and the third through hole (23) in sequence.

6. A miniature flexible electric fan according to claim 1, characterized in that, The air inlet unit of the second housing (5) includes a second air inlet (20) disposed on the second housing (5) and a second air inlet valve cover (10) disposed on the surface of the second housing (5) near the flexible electric ceramic sheet (3) corresponding to the position of the second air inlet (20). One end of the second air inlet valve cover (10) is fixed on the second housing (5), and the other end is a free end, which is used to guide the gas into the second air inlet (20) after it passes through the second air inlet (20). The air outlet unit of the second housing (5) includes a second air outlet (16) disposed on the second housing (5) and a second air outlet valve cover (11) disposed on the surface of the second housing (5) away from the flexural ceramic sheet (3) corresponding to the position of the second air outlet (16); one end of the second air outlet valve cover (11) is fixed on the second housing (5), and the other end is a free end, which is used to guide the gas to be discharged after passing through the second air outlet (16).

7. A miniature flexible electric fan according to claim 6, characterized in that, The second housing (5) has a second air inlet groove (17) on the surface near the flexible ceramic sheet (3), the second air inlet (20) is located in the second air inlet groove (17), one end of the second air inlet groove (17) has a second fixing groove (22), and one end of the second air inlet valve cover (10) is fixedly bonded to the second fixing groove (22), wherein the size of the second air inlet groove (17) corresponds to the size of the second air inlet valve cover (10); The second housing (5) has a second air outlet groove (28) on the surface away from the flexural ceramic sheet (3), and the second air outlet (16) is located in the second air outlet groove (28). One end of the second air outlet groove (28) has a fourth fixing groove (27). One end of the second air outlet valve cover (11) is fixedly bonded to the fourth fixing groove (27). The size of the second air outlet groove (28) corresponds to the size of the second air outlet valve cover (11).

8. A miniature flexible electric fan according to claim 1, characterized in that, The second housing (5) has a second annular groove (15) along the circumferential direction on the surface near the flexural ceramic sheet (3), and the second soft rubber ring (4) is fitted on the second annular groove (15), wherein the outer diameter of the second housing (5) corresponds to the outer diameter of the second soft rubber ring (4).

9. A miniature flexible electric fan according to claim 1, characterized in that, The second housing (5) has a second through hole (21) on one side, and a fourth through hole (24) is provided on the second soft rubber ring at the position corresponding to the second through hole (21). One end of a set of wires (6) is clamped between the flexural ceramic sheet (3) and the second soft rubber ring (4) through the second through hole (21) and the fourth through hole (24) in sequence.

10. A method of using a miniature flexible electric fan, characterized in that, A miniature flexible electric fan according to any one of claims 1-9 includes the following process: After applying an AC voltage to the flexoelectric ceramic sheet (3) through two sets of wires (6), the flexoelectric ceramic sheet (3) undergoes bending deformation under the action of the reverse flexoelectric effect. When the flexoelectric ceramic sheet (3) bends upward, the volume of the first cavity (29) decreases and the pressure increases, the air outlet unit of the first shell (1) opens to exhaust, and at the same time, the volume of the second cavity (30) increases and the pressure decreases, and the air inlet unit of the second shell (5) opens to draw in air. When the flexoelectric ceramic sheet (3) bends downward, the volume of the first cavity (29) increases and the pressure decreases, the air inlet unit of the first shell (1) opens to draw in air, and at the same time, the volume of the second cavity (30) decreases and the pressure increases, and the air outlet unit of the second shell (5) opens to exhaust air, thereby realizing the alternating air outlet of the first cavity (29) and the second cavity (30).

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