A miniature bimorph flexoelectric fan and method of use

Abstract

The application relates to the technical field of flexoelectric fan, and discloses a micro dual-element flexoelectric fan and a use method, a shell of the device comprises an upper air outlet cover and a lower air inlet plate, the two are coveringly arranged, and are respectively provided with an air outlet and an air inlet; a clamping unit is arranged between the upper air outlet cover and the lower air inlet plate, two groups of ceramic fan elements are clamped between the two through the clamping unit, and upper and lower air chambers are formed. A first wire is electrically connected with the upper surfaces of the ceramic fan elements through the clamping unit of the upper air outlet cover, a second wire is electrically connected with the lower surfaces of the ceramic fan elements through the clamping unit of the lower air inlet plate, and the other ends of the wires are electrically connected with the outside. The application realizes bending vibration air supply by applying a sinusoidal alternating voltage to the two groups of ceramic fan elements, breaks away from the material and temperature limitations of a traditional piezoelectric fan, and can stably work in a high-temperature environment.

Description

Technical Field

[0001] This invention relates to the field of flexible electric fan technology, specifically to a miniature dual-element flexible electric fan and its usage method. Background Technology

[0002] As electronic devices continue to miniaturize and improve in performance, traditional heat dissipation methods are increasingly unable to meet the growing heat dissipation demands. Traditional passive heat dissipation methods (such as heat sinks) are limited by heat conduction efficiency, resulting in low heat dissipation efficiency; traditional active heat dissipation methods (such as liquid cooling) suffer from large size and high energy consumption. These traditional methods can no longer meet the application requirements of "space-constrained and high heat flux density".

[0003] Current technologies primarily utilize the piezoelectric effect to fabricate piezoelectric fans. The core principle of a piezoelectric fan is to drive a piezoelectric ceramic to deform using an alternating electric field, then amplify the vibration amplitude with the help of a diaphragm bonded to the ceramic surface, thereby driving airflow for heat dissipation. However, piezoelectric fans still face several technical bottlenecks. For example, the bonding process between the piezoelectric ceramic and the diaphragm significantly impacts fan performance, and the use of high-modulus adhesives increases process complexity, contradicting the development trend of "high integration" in micro-devices. Furthermore, the intrinsic deformation of piezoelectric ceramics is positively correlated with size, and performance degrades significantly after miniaturization. In addition, the operating temperature of piezoelectric ceramics is limited by the Curie temperature, making them unsuitable for high-temperature environments and limiting their application scenarios. The flexoelectric effect, a mechanoelectric coupling effect present in all dielectric materials, is not limited by the Curie temperature and exhibits size dependence—under the same driving voltage, smaller sizes result in greater deformation. Therefore, designing a micro-fan based on the flexoelectric effect that requires no additional bonding process and can operate stably in high-temperature environments is particularly important. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the present invention aims to provide a miniature dual-element flexural fan and a method of using it, so as to solve the technical problems of the complex manufacturing process, difficulty in miniaturization, and inability to adapt to high-temperature environments in the prior art.

[0005] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a miniature dual-element flexible electric fan, comprising two sets of ceramic fan elements, a housing, a first wire, and a second wire; The outer casing includes an upper air outlet cover and a lower air inlet plate, wherein the upper air outlet cover is located above the lower air inlet plate, the upper air outlet cover is provided with a plurality of air outlets, and the lower air inlet plate is provided with a plurality of air inlets; Clamping units are provided between the upper air outlet cover and the lower air inlet plate. The upper and lower surfaces of the two sets of ceramic fan elements are clamped between the upper air outlet cover and the lower air inlet plate by the clamping units. The upper surface of the two sets of ceramic fan elements forms an upper air cavity with the upper air outlet cover, and the lower surface of the two sets of ceramic fan elements forms a lower air cavity with the lower air inlet plate. One end of the first wire is electrically connected to the upper surface of the two sets of ceramic fan elements through the clamping unit of the upper air outlet cover, and the other end is electrically connected to the outside. One end of the second wire is electrically connected to the lower surface of the two sets of ceramic fan elements through the clamping unit of the lower air inlet plate, and the other end is electrically connected to the outside. It is used to transmit a sinusoidal AC voltage to make the two sets of ceramic fan elements bend and vibrate up and down.

[0006] Preferably, the upper air outlet cover has a circumferential mounting groove on the outer periphery of the side near the lower air inlet plate, and the lower air inlet plate has a mounting protrusion on the outer side of the side near the upper air outlet cover corresponding to the mounting groove. The lower air inlet plate is embedded in the mounting groove of the upper air outlet cover through the mounting protrusion for circumferential positioning and end face sealing.

[0007] Preferably, the clamping unit of the upper air outlet cover includes two sets of first clamping beams; the two sets of first clamping beams are respectively fixed parallel to the clamping unit of the lower air inlet plate at both ends of the upper air outlet cover, and are used to clamp the two sets of ceramic fan elements respectively. There is a gap between the two sets of first clamping beams and the inner top of the upper air outlet cover. The two sets of first clamping beams are provided with first clamping grooves along the long side direction. The middle position of the upper surface of the two sets of ceramic fan elements is in contact with the two sets of first clamping beams respectively, and the upper surface of the two sets of ceramic fan elements is embedded in the first clamping groove. One end of the first conductor is electrically connected to the upper surface of the two sets of ceramic fan elements via the upper air outlet cover and the first clamping slots of the two sets of first clamping beams.

[0008] Furthermore, the length of the first clamping groove corresponds to the width of the ceramic fan element, and the depth of the first clamping groove is half the thickness of the ceramic fan element.

[0009] Furthermore, a first connecting groove is provided between one end of the two sets of first clamping beams at the edge of the upper air outlet cover, and a first T-shaped lead wire groove is provided at the edge of the upper air outlet cover through the first connecting groove. The first T-shaped lead wire groove, the first connecting groove, and the two sets of first clamping grooves are all coated with conductive silver paste. One end of the first wire extends into the first T-shaped lead wire groove and is electrically connected to the upper surface of the two sets of ceramic fan elements through the conductive silver paste of the first connecting groove and the two sets of first clamping grooves, respectively, and the other end is electrically connected to the outside.

[0010] Preferably, the clamping unit of the lower air intake plate includes two sets of second clamping beams; the two sets of second clamping beams are respectively fixed parallel to the clamping unit of the upper air outlet cover at both ends of the lower air intake plate, and are used to clamp the two sets of ceramic fan elements respectively; a second clamping groove is provided on each of the two sets of second clamping beams along the long side direction, and the lower surface of the two sets of ceramic fan elements is in contact with the two sets of second clamping beams at the middle position, and the lower surface of the two sets of ceramic fan elements is embedded in the second clamping groove; One end of the second conductor is electrically connected to the lower surface of the two sets of ceramic fan elements via the lower air intake plate and the second clamping slots of the two sets of second clamping beams.

[0011] Furthermore, the length of the second clamping groove corresponds to the width of the ceramic fan element, and the depth of the second clamping groove is half the thickness of the ceramic fan element.

[0012] Furthermore, a second connecting groove is provided between one end of the two sets of second clamping beams at the edge of the lower air intake plate, and a second T-shaped lead wire groove is provided at the edge of the lower air intake plate through the second connecting groove. The second T-shaped lead wire groove, the second connecting groove, and the two sets of second clamping grooves are all coated with conductive silver paste. One end of the second wire extends into the second T-shaped lead wire groove and is electrically connected to the lower surface of the two sets of ceramic fan elements through the conductive silver paste of the second connecting groove and the two sets of second clamping grooves, respectively, and the other end is electrically connected to the outside.

[0013] Preferably, the air outlets of the upper air outlet cover are arranged side by side in the middle of the upper air outlet cover and located between the two sets of ceramic fan elements. The lower air intake plate has several air inlets symmetrically arranged at both ends of the lower air intake plate, and correspondingly distributed below the two sets of ceramic fan elements.

[0014] Secondly, the present invention also provides a method of using a miniature dual-element flexural fan, which, based on the aforementioned miniature dual-element flexural fan, includes the following process: A sinusoidal AC voltage is applied to two sets of ceramic fan elements that are centrally constrained and free at both ends through the first and second wires, causing the two sets of ceramic fan elements to bend and vibrate up and down. When the two sets of ceramic fan elements bend and approach the lower air chamber, they obstruct the airflow and restrict the gas from flowing back to the air inlet. When the two sets of ceramic fan elements bend and approach the upper air chamber, they allow the airflow to pass smoothly. External air enters the lower air chamber through the air inlet of the lower air inlet plate. After being efficiently disturbed by the vibrating two sets of ceramic fan elements, it forms a directional airflow that enters the upper air chamber and is discharged through the air outlet of the upper air outlet cover, thereby realizing the continuous air supply function.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a miniature dual-element flexural fan, which adopts an overall layout of two sets of ceramic fan elements, a housing, upper and lower cavities, and dual-wire power supply. Structurally, it uses flexural electric drive, eliminating the need for traditional motors and bearings, thus eliminating complex transmission components such as motors, shafts, and fan blades. This provides core structural support for fan miniaturization, simplified manufacturing, and adaptability to high-temperature environments. The parallel arrangement of the two elements also provides a structural basis for improving air delivery efficiency and fault tolerance. By applying a sinusoidal AC voltage to the two sets of ceramic fan elements, bending vibration air delivery is achieved. In principle, it breaks away from the material and temperature limitations of traditional piezoelectric fans and can operate stably in high-temperature environments.

[0016] Furthermore, by using mounting protrusions and mounting grooves, the upper air outlet cover and the lower air inlet plate are circumferentially positioned and their end faces are sealed. This ensures easy assembly while improving the sealing performance of the housing, allowing the airflow in the upper and lower air chambers to flow in a directional manner, avoiding air leakage that could lead to a decrease in efficiency. Reliable assembly can be achieved without complex fastening structures, simplifying the processing and assembly process, reducing integration difficulty, improving the overall structural reliability, and facilitating the stable realization of miniaturized structures.

[0017] Furthermore, the ceramic fan element is clamped in the middle by the first clamping beam and the first clamping groove, realizing a cantilever beam vibration mode with central constraint and free ends. The ceramic fan element can be fixed without bonding, eliminating the reliability risks caused by the adhesive layer. The clamping structure is integrated with the shell, simplifying the manufacturing and assembly process, reducing manufacturing costs, and ensuring stable electrical connection. This provides a reliable clamping and conductive foundation for high-efficiency flexible electric drive and miniaturized ultra-thin structure.

[0018] Furthermore, the length of the first clamping groove is matched with the width of the ceramic fan component, and the depth is set to half the thickness of the component. This ensures precise clamping and uniform force distribution, guaranteeing reliable clamping without affecting the bending deformation of the component. It fully leverages the size advantage of the flexural electrical effect, and can still stably constrain and increase the amplitude when the component thickness is reduced, thereby improving air output efficiency and enhancing the miniaturization and high-efficiency air delivery effect.

[0019] Furthermore, by using the first connecting groove and the first T-shaped lead groove in conjunction with conductive silver paste, an integrated conductive connection is achieved between the first conductor and the upper surface of the two sets of ceramic fan components. This eliminates the need for additional welding or bonding of conductive parts, simplifies the electrical connection process, improves connection reliability, and is suitable for miniaturized mass production. At the same time, it ensures that the two sets of components are powered synchronously and stably, maintains the consistency of the parallel drive of the two components, and improves the overall working stability and service life.

[0020] Furthermore, the lower surface of the ceramic fan component is clamped by the second clamping beam and the second clamping groove, which, together with the upper clamping structure, achieves precise center constraint of the upper and lower parts of the component, ensuring stable vibration mode. The non-adhesive clamping method is also adopted to reduce process complexity and reliability risks, and provides stable support for the electrical connection of the lower surface. This enables the two components to stably achieve up and down bending vibration in the micro structure, and improves the working stability in high temperature environment.

[0021] Furthermore, the size of the second clamping slot is matched with that of the ceramic fan component, so that the lower clamp also has the characteristics of precise positioning and uniform force distribution, ensuring that the ceramic fan component does not shift or fall off during high-frequency bending vibration, giving full play to the high amplitude and high air output efficiency brought about by the thinness, and strengthening the advantages of miniaturization, high efficiency and high reliability.

[0022] Furthermore, the lower side is electrically integrated through the second connecting groove, the second T-shaped lead groove, and conductive silver paste, which symmetrically matches the upper conductive structure to ensure stable and reliable power supply. The process is simple and suitable for miniaturized structure implementation, further reducing integration difficulty and improving conductivity stability under high temperature and long-term operation, providing electrical protection for parallel drive of dual components and improving fault tolerance.

[0023] Furthermore, the air outlet is positioned between the two sets of ceramic fan elements, and the air inlet is symmetrically positioned below the elements, so that the airflow enters from both ends and is concentrated and discharged in the middle. The flow path is reasonable and the resistance is small. Combined with the vibration of the two elements, it can achieve efficient directional air delivery and improve the air delivery efficiency. This airflow layout structure is simple and does not require complex flow channel design, which is conducive to miniaturization. At the same time, it can make the airflow disturbed by the two elements more complete, which enhances the effect of high air delivery efficiency and structural simplification.

[0024] This invention also provides a method for using a miniature dual-element flexural fan. By applying a sinusoidal AC voltage to two ceramic fan elements that are constrained at the center and free at both ends, the fan achieves up-and-down bending vibration. The vibration of the elements enables unidirectional airflow and continuous air delivery. Utilizing the size dependence of the flexural effect, the elements still possess large amplitude and high air output efficiency even with a thin and miniaturized design. The parallel drive of the two elements can maintain basic air delivery even if a single element fails, improving fault tolerance and service life. This drive method has no mechanical wear and no adhesive structure, and can work stably in high-temperature environments. From the perspective of usage method, it fully realizes the technical effects of simplified process, miniaturization, high temperature resistance, high reliability, and long life. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the explosion and disassembly of a miniature dual-element flexural fan in an embodiment of the present invention; Figure 2 This is a schematic diagram of the outer shell structure in an embodiment of the present invention; Figure 3This is a bottom view of the upper air outlet cover in an embodiment of the present invention; Figure 4 This is a top view of the lower air intake plate in an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly of the ceramic fan component in an embodiment of the present invention; Figure 6 This is a schematic diagram of the overall structure of the miniature dual-element flexural fan in an embodiment of the present invention; Figure 7 This is a sectional view along line AA of a miniature dual-element flexural fan in an embodiment of the present invention; Figure 8 This is a BB-direction cross-sectional view of a miniature dual-element flexural fan in an embodiment of the present invention; Figure 9 This is a schematic diagram illustrating the working principle of a miniature dual-element flexural fan in an embodiment of the present invention. In the diagram: 1. Ceramic fan element; 2. Housing; 3. Upper air outlet cover; 4. Lower air inlet plate; 5. Assembly groove; 6. Air outlet; 7. First clamping beam; 8. First clamping groove; 9. First connecting groove; 10. First T-shaped lead wire groove; 11. Assembly protrusion; 12. Air inlet; 13. Second clamping beam; 14. Second clamping groove; 15. Second connecting groove; 16. Second T-shaped lead wire groove; 17. First conductor; 18. Conductive silver paste; 19. Second conductor; 20. Upper air chamber; 21. Lower air chamber. Detailed Implementation

[0026] 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.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] The purpose of this invention is to provide a miniature dual-element flexural fan and its usage method, so as to solve the technical problems of complex fan manufacturing processes, difficulty in miniaturization, and inability to adapt to high-temperature environments in the prior art.

[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 and Figure 8 In one embodiment of the present invention, a miniature dual-element flexible electric fan is provided, comprising two sets of ceramic fan elements 1, a housing 2, a first conductor 17, and a second conductor 19. The ceramic fan elements 1 are two square flexible ceramic sheets with electrode structures. The electrodes are gold electrodes, which have high stability and conductivity. The dimensions of both ceramic fan elements 1 are 8×8×0.1 mm. 3 .

[0030] The outer shell 2 is made of engineering light-cured resin with high mechanical strength and heat resistance. It consists of two parts: an upper air outlet cover 3 and a lower air inlet plate 4. The upper air outlet cover 3 is placed on top of the lower air inlet plate 4. After the two are fastened together, they form a complete outer shell structure. After assembly, epoxy resin is used to seal the gaps on the sides of the outer shell 2 to extend its service life.

[0031] The overall dimensions of the upper air vent cover 3 are 20.5 × 11.2 × 2.5 mm. 3 The rectangular plate structure has a frame-shaped mounting groove 5 with a width of 1 mm and a depth of 0.5 mm, having an opening of 0.2 mm, on the outer periphery of the side near the lower air intake plate 4. This mounting groove 5 is 1.5 mm away from the outer periphery of the upper air outlet cover 3. Three circular air outlets 6 with a diameter of 1 mm are evenly arranged along the short side of the middle position of the upper air outlet cover 3. The air outlets 6 are arranged side by side in the middle of the upper air outlet cover 3 and are located between the two sets of ceramic fan elements 1.

[0032] A clamping unit is provided on the side of the upper air outlet cover 3 near the lower air intake plate 4. The clamping unit includes two sets of first clamping beams 7. The two sets of first clamping beams 7 are fixed parallel to the clamping unit of the lower air intake plate 4 at both ends of the upper air outlet cover 3. They are symmetrically arranged at a distance of 4.35 mm from the center of the plate along the long side of the upper air outlet cover 3. The dimensions of the first clamping beam 7 are 0.2 mm in width, 8.2 mm in length, and 0.5 mm in height. It is suspended and fixed on the inner wall of the upper air outlet cover 3. There is a gap between the two sets of first clamping beams 7 and the inner top of the upper air outlet cover 3, which is reserved space for the vibration of the ceramic fan element 1.

[0033] Both sets of first clamping beams 7 have first clamping grooves 8 along their long sides. The dimensions of the first clamping groove 8 are 0.2 mm wide, 8 mm long, and 0.05 mm deep. Its length corresponds to the width of the ceramic fan element 1, and its depth is half the thickness of the ceramic fan element 1. The upper surface of the two sets of ceramic fan elements 1 contacts the two sets of first clamping beams 7 at the middle position, and the upper surface of the two sets of ceramic fan elements 1 is embedded in the first clamping groove 8, thereby achieving stable clamping of the upper surface of the ceramic fan element 1.

[0034] A first connecting groove 9 is provided at the edge of the upper air outlet cover 3 between one end of the two sets of first clamping beams 7. The first connecting groove 9 has a width of 0.1 mm and a depth of 0.05 mm. A first T-shaped lead wire groove 10 is provided at the edge of the upper air outlet cover 3 through the first connecting groove 9. The first T-shaped lead wire groove 10 has a width of 0.2 mm and a depth of 0.05 mm. Its longitudinal section extends to the outer periphery of the upper air outlet cover 3. The first connecting groove 9 and the transverse section of the first T-shaped lead wire groove 10 are connected. Conductive silver paste 18 is uniformly coated in the first T-shaped lead wire groove 10, the first connecting groove 9, and the two sets of first clamping grooves 8 to achieve electrical connection.

[0035] The lower air intake plate 4 is a rectangular plate structure with dimensions of 20.5×11.2×1.5 mm³. On the outer periphery of the side near the upper air outlet cover 3, there is a frame-shaped mounting protrusion 11 with an opening of 0.2 mm, a width of 1 mm, and a height of 0.5 mm. The mounting protrusion 11 is 1.5 mm away from the outer periphery of the lower air intake plate 4. The lower air intake plate 4 is completely embedded in the mounting groove 5 of the upper air outlet cover 3 through the mounting protrusion 11, which is used for circumferential positioning and end face sealing to ensure the sealing of the outer shell 2.

[0036] Two rectangular air inlets 12, each 1.2 mm wide and 5 mm long, are symmetrically arranged on both sides of the lower air intake plate 4 along the long side. Several air inlets 12 are symmetrically arranged at both ends of the lower air intake plate 4 and are distributed below the two sets of ceramic fan elements 1 to facilitate the entry of external air.

[0037] A clamping unit is provided on the side of the lower air intake plate 4 near the upper air outlet cover 3. The clamping unit includes two sets of second clamping beams 13. The two sets of second clamping beams 13 are fixed parallel to the first clamping beams 7 of the upper air outlet cover 3 at both ends of the lower air intake plate 4. They are symmetrically arranged at a distance of 4.35 mm from the center of the lower air intake plate 4 along the long side. The dimensions of the second clamping beam 13 are 0.2 mm in width, 8.2 mm in length, and 0.5 mm in height. Its two ends along the length direction and its lower side along the height direction are connected to the inner wall of the lower air intake plate 4.

[0038] Each of the two sets of second clamping beams 13 has a second clamping groove 14 along its long side. The dimensions of the second clamping groove 14 are 0.2 mm wide, 8 mm long, and 0.05 mm deep. Its length corresponds to the width of the ceramic fan element 1, and its depth is half the thickness of the ceramic fan element 1. The lower surface of each of the two sets of ceramic fan elements 1 contacts the middle of the two sets of second clamping beams 13, and the lower surface of each set of ceramic fan elements 1 is embedded in the second clamping groove 14.

[0039] The depth of the clamping cavity formed by the engagement of the first clamping groove 8 and the second clamping groove 14 is strictly consistent with the thickness of the ceramic fan element 1, which firmly clamps and fixes the middle of the two ceramic fan elements 1, forming two cantilever beam structures with central constraint and free ends. The free overhang lengths of the ceramic fan elements 1 at both ends are consistent and do not interfere with the inner sidewall of the outer shell 2, ensuring the degree of freedom of vibration.

[0040] A second connecting groove 15 is provided at the edge of the lower air intake plate 4 between one end of the two sets of second clamping beams 13. The second connecting groove 15 has a width of 0.1 mm and a depth of 0.05 mm. A second T-shaped lead wire groove 16 is provided at the edge of the lower air intake plate 4 through the second connecting groove 15. The second T-shaped lead wire groove 16 has a width of 0.2 mm and a depth of 0.05 mm. Its longitudinal section extends to the outer periphery of the lower air intake plate 4. The second connecting groove 15 and the transverse section of the second T-shaped lead wire groove 16 are connected. The second T-shaped lead wire groove 16, the second connecting groove 15 and the two sets of second clamping grooves 14 are all uniformly coated with conductive silver paste 18, which cooperates with the conductive silver paste 18 on the upper air outlet cover 3 to form a complete electrical circuit.

[0041] After the upper air outlet cover 3 and the lower air inlet plate 4 are fastened together, an upper air cavity 20 is formed between the upper air outlet cover 3 and the upper surface of the ceramic fan element 1, and a lower air cavity 21 is formed between the lower air inlet plate 4 and the lower surface of the ceramic fan element 1. The depth of the upper air cavity 20 is greater than the depth of the lower air cavity 21, providing reasonable space for airflow and vibration of the ceramic fan element 1.

[0042] One end of the first wire 17 extends into the first T-shaped lead groove 10, and is tightly connected to the upper surface electrodes of the two sets of ceramic fan elements 1 through the first connecting groove 9 and the conductive silver paste 18 of the two sets of first clamping grooves 8, respectively, so as to electrically connect the two ceramic fan elements 1 in parallel, and the other end is led out to the outside; one end of the second wire 19 extends into the second T-shaped lead groove 16, and is tightly connected to the lower surface electrodes of the two sets of ceramic fan elements 1 through the second connecting groove 15 and the conductive silver paste 18 of the two sets of second clamping grooves 14, respectively, forming a complete drive electrical circuit with the first wire 17 and the ceramic fan elements 1, and the other end is led out to the outside, used to transmit sinusoidal AC voltage to make the two sets of ceramic fan elements 1 bend and vibrate up and down.

[0043] The final molded size of the miniature dual-element flexural fan in this embodiment is 20.5 × 11.2 × 4 mm. 3 It has a compact structure and achieves miniaturization design.

[0044] Example 2 See Figure 9 This embodiment also provides a method for using a miniature dual-element flexural fan. Based on the miniature dual-element flexural fan described in Embodiment 1, the specific usage process is as follows: First, ensure that the miniature dual-element flexural fan is fully assembled, the conductive silver paste 18 has been completely cured, the gaps on the sides of the outer casing 2 have been sealed with epoxy resin, and the other ends of the first wire 17 and the second wire 19 are connected to the external power supply equipment to form a stable power supply circuit.

[0045] Through an external power supply device, a sinusoidal AC voltage is applied to two sets of ceramic fan elements 1 that are centrally constrained and free at both ends via the first conductor 17 and the second conductor 19. Under the action of the sinusoidal AC voltage, the two sets of ceramic fan elements 1 undergo up-and-down bending vibration along the thickness direction.

[0046] Since the depth of the upper air chamber 20 is greater than the depth of the lower air chamber 21, during the vibration of the cantilever beam of the ceramic fan element 1, when the two sets of ceramic fan elements 1 bend closer to the shallower lower air chamber 21, they obstruct the airflow and restrict the gas from flowing back to the air inlet 12; when the two sets of ceramic fan elements 1 bend closer to the deeper upper air chamber 20, the airflow is allowed to pass smoothly.

[0047] Under the influence of air pressure difference, external air enters the lower air chamber 21 through the air inlet 12 of the lower air inlet plate 4. After being efficiently disturbed by the two sets of vibrating ceramic fan elements 1, it forms a directional airflow that enters the upper air chamber 20. Subsequently, the airflow is discharged through the air outlet 6 in the middle of the upper air outlet cover 3, thereby realizing the continuous air supply function.

[0048] In this method of use, the two sets of ceramic fan elements 1 are driven in parallel. Even if one element fails due to accidental damage or fatigue, the other element can still maintain the basic air delivery function, which improves the fault tolerance and service life of the fan. At the same time, the flexural ceramic fan element 1 does not require additional bonding process and can work stably in high-temperature environments, breaking through the temperature limit of traditional piezoelectric fans.

[0049] Example 3 This embodiment provides a method for manufacturing a miniature dual-element flexural fan, used to manufacture the miniature dual-element flexural fan described in Embodiment 1. The specific steps are as follows: Step 1: Manufacturing and Electrode Forming of Ceramic Fan Component 1 Using an STX-202A diamond wire cutter, the flexoelectric ceramic blank is cut into two square flexoelectric ceramic sheets with dimensions of 8×8×0.1 mm³. Through magnetron sputtering, gold electrode layers are sputtered and deposited on the upper and lower surfaces of the two square flexoelectric ceramic sheets to obtain a ceramic fan element 1 with an electrode structure. The gold electrode has the advantages of stability and high conductivity, ensuring the reliability of the electrical connection.

[0050] Step 2: Integrated additive manufacturing of the outer casing 2 of the flexural fan The outer shell 2 of the flexible electric fan is manufactured in one piece using photopolymer 3D printing technology. The outer shell 2 is made of engineering photopolymer resin, which possesses high mechanical strength and heat resistance, making it suitable for the use of miniature fans. The outer shell 2 consists of two parts: an upper air outlet cover 3 and a lower air inlet plate 4, as detailed below: Upper air outlet cover 3: The overall structure is a rectangular plate with dimensions of 20.5 × 11.2 × 2.5 mm³. A frame-shaped mounting groove 5, 1 mm wide and 0.5 mm deep, with a 0.2 mm opening, is formed circumferentially 1.5 mm from the outer perimeter of the upper air outlet cover 3. Two first clamping beams 7, each 0.2 mm wide, 8.2 mm long, and 0.5 mm high, are symmetrically arranged 4.35 mm from the center of the plate along the long side of the upper air outlet cover 3. These first clamping beams 7 are suspended and fixed to the inner wall of the upper air outlet cover 3. First clamping grooves 8, each 0.2 mm wide, 8 mm long, and 0.05 mm deep, are formed in the upper middle area of ​​the two first clamping beams 7. A first T-shaped lead wire groove 10, 0.2 mm wide and 0.05 mm deep, is formed at the front end of each first clamping beam 7. The first clamping groove 8 passes through a lead wire groove 10 with a width of 0.1 mm and a depth of 0.05 mm. The first connecting groove 9 of mm is connected to the transverse section of the first T-shaped lead groove 10, and the longitudinal section of the first T-shaped lead groove 10 extends to the outer periphery of the upper air outlet cover 3; three circular air outlets 6 with a diameter of 1 mm are evenly arranged in the middle position of the upper air outlet cover 3 along the short side direction.

[0051] Lower air intake plate 4: The overall structure is a rectangular plate with dimensions of 20.5 × 11.2 × 1.5 mm³. A frame-shaped mounting protrusion 11, 1 mm wide and 0.5 mm high, with a 0.2 mm opening, is formed circumferentially 1.5 mm from the outer periphery of the lower air intake plate 4. Two second clamping beams 13, each 0.2 mm wide, 8.2 mm long, and 0.5 mm high, are symmetrically arranged 4.35 mm from the center of the plate along its long side. The two ends of the second clamping beams 13 along their length and the lower side along their height are connected to the inner wall of the lower air intake plate 4. Second clamping grooves 14, each 0.2 mm wide, 8 mm long, and 0.05 mm deep, are formed in the upper middle area of ​​the two second clamping beams 13. A second T-shaped lead wire groove 16, 0.2 mm wide and 0.05 mm deep, is formed at the front end of the second clamping beams 13. The second clamping grooves 14 have a width of 0.1 mm and a depth of [missing information]. The second connecting groove 15, which is 0.05 mm deep, is connected to the transverse section of the second T-shaped lead wire groove 16. The longitudinal section of the second T-shaped lead wire groove 16 extends to the outer periphery of the lower air intake plate 4. Two rectangular air inlets 12, each 1.2 mm wide and 5 mm long, are symmetrically arranged 6.5 mm away from the center of the lower air intake plate 4 along its long side.

[0052] Step 3: Pre-coating with conductive silver paste 18 and pre-arranging wires Conductive silver paste 18 is evenly applied to the first T-shaped lead groove 10, the first connecting groove 9, and the first clamping groove 8 of the upper air outlet cover 3, and the second T-shaped lead groove 16, the second connecting groove 15, and the second clamping groove 14 of the lower air inlet plate 4. Utilizing the adhesiveness of the conductive silver paste 18, the first wire 17 and the second wire 19 are pre-placed in the longitudinal sections of the first T-shaped lead groove 10 of the upper air outlet cover 3 and the second T-shaped lead groove 16 of the lower air inlet plate 4, respectively. One end of the first wire 17 and the second wire 19 are bonded to the conductive silver paste 18, and the other end is led out to the outside, preparing for subsequent electrical connections.

[0053] Step 4: Positioning and assembling ceramic fan component 1 The middle regions of the two ceramic fan elements 1 are respectively placed in the second clamping grooves 14 of the two second clamping beams 13 of the lower air intake plate 4. The length of the second clamping groove 14 is consistent with the side length of the ceramic fan element 1 to ensure accurate positioning. The upper air outlet cover 3 is placed on top of the lower air intake plate 4, so that the outer peripheral mounting protrusion 11 of the lower air intake plate 4 is completely embedded in the outer peripheral mounting groove 5 of the upper air outlet cover 3 to achieve circumferential positioning and end face sealing. At this time, the first clamping beam 7 of the upper air outlet cover 3 and the second clamping beam 13 of the lower air intake plate 4 are respectively fixed in the clamping cavity formed by the first clamping groove 8 and the second clamping groove 14, forming two cantilever beam structures with central constraint and free ends. After the upper air outlet cover 3 and the lower air intake plate 4 are fastened, an upper air cavity 20 is formed between the upper air outlet cover 3 and the upper surface of the ceramic fan element 1, and a lower air cavity 21 is formed between the lower air intake plate 4 and the lower surface of the ceramic fan element 1, and the depth of the upper air cavity 20 is greater than the depth of the lower air cavity 21.

[0054] Step 5: Electrical connection curing and micro dual-component flexural fan molding After the upper air outlet cover 3 and the lower air inlet plate 4 are fastened together, the conductive silver paste 18 in the first clamping groove 8 is tightly bonded to the upper surface electrodes of the two ceramic fan elements 1 and connected to one end of the first wire 17, thus electrically connecting the two ceramic fan elements 1 in parallel; the conductive silver paste 18 in the second clamping groove 14 is tightly bonded to the lower surface electrodes of the two ceramic fan elements 1 and connected to one end of the second wire 19, forming a complete drive electrical circuit.

[0055] The assembled flexible electric fan was placed in a constant temperature environment of 50 ℃ for 30 minutes to allow the conductive silver paste 18 to fully cure and form a stable mechanical connection and electrical conductivity interface. Subsequently, epoxy resin was used to seal the gaps on both sides of the outer casing to extend its service life, resulting in a final size of 20.5×11.2×4 mm. 3 Miniature dual-element flexural fan.

[0056] In summary, this invention provides a miniature dual-element flexural fan and its usage method. Utilizing the flexural effect and parallel driving of two ceramic fan elements, it significantly reduces integration difficulty, overcomes the temperature limitations of traditional fans, improves the fan's fault tolerance and lifespan, and enables miniaturization. Specifically, the use of flexural ceramic fan elements eliminates the need for additional bonding processes, employing an integrated molding structure that eliminates the reliability risks associated with adhesive layers and significantly reduces integration difficulty and manufacturing costs. This invention can operate stably in high-temperature environments, overcoming the temperature limitations of traditional piezoelectric fans. The flexural effect employed in this invention is size-dependent; as the thickness of the ceramic fan element decreases, the amplitude of the cantilever beam structure of the ceramic fan element significantly increases under the same driving voltage, thereby improving airflow efficiency and enabling fan miniaturization. The parallel driving method of the two ceramic fan elements ensures that even if one element fails due to accidental damage or fatigue, the other element can still maintain basic airflow function, improving the fan's fault tolerance and lifespan.

[0057] 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 dual-element flexural electric fan, characterized in that, It includes two sets of ceramic fan components (1), a housing (2), a first wire (17), and a second wire (19); The outer casing (2) includes an upper air outlet cover (3) and a lower air inlet plate (4), wherein the upper air outlet cover (3) is located above the lower air inlet plate (4), the upper air outlet cover (3) is provided with a plurality of air outlets (6), and the lower air inlet plate (4) is provided with a plurality of air inlets (12). Clamping units are provided between the upper air outlet cover (3) and the lower air inlet plate (4). The upper and lower surfaces of the two sets of ceramic fan elements (1) are clamped between the upper air outlet cover (3) and the lower air inlet plate (4) through the clamping units. The upper surface of the two sets of ceramic fan elements (1) forms an upper air cavity (20) with the upper air outlet cover (3), and the lower surface of the two sets of ceramic fan elements (1) forms a lower air cavity (21) with the lower air inlet plate (4). One end of the first wire (17) is electrically connected to the upper surface of the two sets of ceramic fan elements (1) through the clamping unit of the upper air outlet cover (3), and the other end is electrically connected to the outside. One end of the second wire (19) is electrically connected to the lower surface of the two sets of ceramic fan elements (1) through the clamping unit of the lower air inlet plate (4), and the other end is electrically connected to the outside. It is used to transmit sinusoidal AC voltage so that the two sets of ceramic fan elements (1) can bend and vibrate up and down.

2. A miniature dual-element flexural fan according to claim 1, characterized in that, The upper air outlet cover (3) has a circumferential mounting groove (5) on the outer periphery of the side near the lower air inlet plate (4). The lower air inlet plate (4) has a mounting protrusion (11) on the side near the upper air outlet cover (3) corresponding to the mounting groove (5). The lower air inlet plate (4) is embedded in the mounting groove (5) of the upper air outlet cover (3) through the mounting protrusion (11) for circumferential positioning and end face sealing.

3. A miniature dual-element flexural fan according to claim 1, characterized in that, The clamping unit of the upper air outlet cover (3) includes two sets of first clamping beams (7); the two sets of first clamping beams (7) are respectively fixed parallel to the clamping unit of the lower air inlet plate (4) at both ends of the upper air outlet cover (3) for clamping the two sets of ceramic fan elements (1) respectively, and there is a gap between the two sets of first clamping beams (7) and the inner top of the upper air outlet cover (3). The two sets of first clamping beams (7) are provided with first clamping grooves (8) along the long side direction. The middle position of the upper surface of the two sets of ceramic fan elements (1) is in contact with the two sets of first clamping beams (7) respectively, and the upper surface of the two sets of ceramic fan elements (1) is embedded in the first clamping grooves (8). One end of the first conductor (17) is electrically connected to the upper surface of the two sets of ceramic fan elements (1) via the upper air outlet cover (3) and the first clamping groove (8) of the two sets of first clamping beams (7).

4. A miniature dual-element flexural fan according to claim 3, characterized in that, The length of the first clamping groove (8) corresponds to the width of the ceramic fan element (1), and the depth of the first clamping groove (8) is half the thickness of the ceramic fan element (1).

5. A miniature dual-element flexural fan according to claim 3, characterized in that, A first connecting groove (9) is provided between one end of the two sets of first clamping beams (7) at the edge of the upper air outlet cover (3), and a first T-shaped lead wire groove (10) is provided at the edge of the upper air outlet cover (3) through the first connecting groove (9). The first T-shaped lead wire groove (10), the first connecting groove (9) and the two sets of first clamping grooves (8) are all coated with conductive silver paste (18). One end of the first wire (17) extends into the first T-shaped lead wire groove (10), and is electrically connected to the upper surface of the two sets of ceramic fan elements (1) through the conductive silver paste (18) of the first connecting groove (9) and the two sets of first clamping grooves (8), respectively, and the other end is electrically connected to the outside.

6. A miniature dual-element flexural fan according to claim 1, characterized in that, The clamping unit of the lower air intake plate (4) includes two sets of second clamping beams (13); the two sets of second clamping beams (13) are respectively fixed parallel to the clamping unit of the upper air outlet cover (3) at both ends of the lower air intake plate (4) for clamping the two sets of ceramic fan elements (1) respectively; the two sets of second clamping beams (13) are provided with second clamping grooves (14) along the long side direction, the middle position of the lower surface of the two sets of ceramic fan elements (1) respectively contacts the two sets of second clamping beams (13), and the lower surface of the two sets of ceramic fan elements (1) is embedded in the second clamping grooves (14); One end of the second conductor (19) is electrically connected to the lower surface of the two sets of ceramic fan elements (1) via the lower air intake plate (4) and the second clamping groove (14) of the two sets of second clamping beams (13).

7. A miniature dual-element flexural fan according to claim 6, characterized in that, The length of the second clamping groove (14) corresponds to the width of the ceramic fan element (1), and the depth of the second clamping groove (14) is half the thickness of the ceramic fan element (1).

8. A miniature dual-element flexural fan according to claim 6, characterized in that, A second connecting groove (15) is provided at the edge of the lower air intake plate (4) between one end of the two sets of second clamping beams (13), and a second T-shaped lead wire groove (16) is provided at the edge of the lower air intake plate (4) through the second connecting groove (15). The second T-shaped lead wire groove (16), the second connecting groove (15) and the two sets of second clamping grooves (14) are all coated with conductive silver paste (18). One end of the second wire (19) extends into the second T-shaped lead wire groove (16), and is electrically connected to the lower surface of the two sets of ceramic fan elements (1) through the conductive silver paste (18) of the second connecting groove (15) and the two sets of second clamping grooves (14), respectively. The other end is electrically connected to the outside.

9. A miniature dual-element flexural fan according to claim 1, characterized in that, The air outlets (6) of the upper air outlet cover (3) are arranged side by side in the middle of the upper air outlet cover (3) and located between the two sets of ceramic fan elements (1); The lower air intake plate (4) has several air inlets (12) symmetrically arranged at both ends of the lower air intake plate (4) and correspondingly distributed below the two sets of ceramic fan elements (1).

10. A method of using a miniature dual-element flexural electric fan, characterized in that, A miniature dual-element flexural fan according to any one of claims 1-9 includes the following process: A sinusoidal AC voltage is applied to the two sets of ceramic fan elements (1) that are centrally constrained and free at both ends through the first wire (17) and the second wire (19), causing the two sets of ceramic fan elements (1) to bend and vibrate up and down. When the two sets of ceramic fan elements (1) bend close to the lower air chamber (21), they block the airflow and restrict the gas from flowing back to the air inlet. When the two sets of ceramic fan elements (1) bend close to the upper air chamber (20), the airflow is allowed to pass smoothly. The external air enters the lower air chamber (21) through the air inlet (12) of the lower air inlet plate (4). After being efficiently disturbed by the two sets of vibrating ceramic fan elements (1), a directional airflow is formed and enters the upper air chamber (20) and is discharged through the air outlet (6) of the upper air outlet cover (3), thereby realizing the continuous air supply function.

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