Pump body structure of piezoelectric fan and piezoelectric fan

Abstract

The utility model provides a pump body structure of a piezoelectric fan and the piezoelectric fan. The pump body structure of the piezoelectric fan comprises a piezoelectric vibrator, a pump body and a pump body, a vibrating diaphragm is arranged on one side of the piezoelectric vibrator; the vibrating membrane is provided with a first vent hole communicated with the interior of the piezoelectric vibrator; the piezoelectric vibrator is provided with a vibration node; a cavity; a first opening is formed in one side of the cavity; the side, close to the first vent hole, of the piezoelectric vibrator is located in the cavity, and the wall face of the first opening is connected with a vibration node through a flexible connecting piece so that the piezoelectric vibrator can be suspended in the first opening. A ventilation channel is formed in a space between the piezoelectric vibrator and the cavity; the cavity is provided with a second vent hole; the first ventilation hole, the ventilation channel, the second ventilation hole and the interior of the piezoelectric vibrator are communicated, and the second ventilation hole is formed below the vibrating membrane. According to the embodiment of the invention, vibration noise and airflow noise generated by the cavity due to vibration of the pump body of the piezoelectric fan can be reduced.

Description

Technical Field

[0001] This application belongs to the field of piezoelectric fan technology, and more specifically, relates to a pump body structure of a piezoelectric fan and a piezoelectric fan. Background Technology

[0002] Piezoelectric fans utilize the inverse effect of piezoelectric materials to drive a vibrating diaphragm to generate airflow, making them suitable for heat dissipation in consumer electronics products that are sensitive to space and noise. As a precision fluid drive device, the pump body of a piezoelectric fan generates high-frequency vibrations that can easily be transmitted outwards through the cavity, causing vibrations in other components and generating noise. Simultaneously, the airflow generated by this high-frequency vibration can easily collide with each other within the cavity, producing significant airflow noise. Utility Model Content

[0003] To improve or solve the technical problems of excessive vibration noise and airflow noise generated by the pump body of piezoelectric fans in related technologies, this application provides a pump body structure for a piezoelectric fan and a piezoelectric fan.

[0004] In a first aspect, embodiments of this application provide a pump body structure for a piezoelectric fan, comprising:

[0005] A piezoelectric vibrator; a vibrating diaphragm is provided on one side of the piezoelectric vibrator; the vibrating diaphragm is provided with a first vent hole communicating with the interior of the piezoelectric vibrator; the piezoelectric vibrator has a vibration node;

[0006] A cavity; one side of the cavity has a first opening; the side of the piezoelectric vibrator near the first vent is located inside the cavity, and the wall of the first opening is connected to the vibration node through a flexible connector so that the piezoelectric vibrator is suspended in the first opening; the space between the piezoelectric vibrator and the cavity forms a ventilation channel; the cavity is provided with a second vent.

[0007] The first vent, the venting channel, the second vent, and the piezoelectric vibrator are internally connected; the second vent is located below the vibrating diaphragm.

[0008] Furthermore, the second vent is located within the vibration projection position; the vibration projection position refers to the position where the projection formed by light projecting onto the cavity from the vibrating part of the vibrating diaphragm; the vibrating part includes a first vibrating part and a second vibrating part; the amplitude of the first vibrating part is a first amplitude; the amplitude of the second vibrating part is a second amplitude; the first amplitude is greater than the second amplitude; there are multiple first vents; the number density of the first vents in the first vibrating part is greater than the number density of the first vents in the second vibrating part.

[0009] Furthermore, the vibration projection position includes a first vibration projection position and a second vibration projection position; the first vibration projection position corresponds to the first vibration part; the second vibration projection position corresponds to the second vibration part; the number of second vents is multiple, and the number density of second vents in the first vibration projection position is greater than the number density of second vents in the second vibration projection position.

[0010] Furthermore, the piezoelectric vibrator includes: a piezoelectric drive element and a first frame; the piezoelectric drive element, the first frame, and the vibrating diaphragm form a vibration chamber; the piezoelectric drive element is located on the opposite side of the vibrating diaphragm; the piezoelectric drive element is connected to the wall of the first opening of the chamber via a flexible connector.

[0011] Furthermore, the central axis of the piezoelectric vibrator coincides with the central axis of the cavity, and the piezoelectric vibrator includes two vibration nodes; the line connecting the two vibration nodes intersects the central axis of the cavity, and the two vibration nodes are respectively connected to the wall of the first opening of the cavity through the flexible connector so that the piezoelectric vibrator is suspended in the first opening.

[0012] Furthermore, the flexible connector includes a bending hinge; the vibration node of the piezoelectric vibrator is connected to the cavity via the bending hinge.

[0013] Furthermore, the flexible connector includes an elastic connector; the vibration node of the piezoelectric vibrator is connected to the cavity through the elastic connector.

[0014] Furthermore, the cavity includes a shell and a second frame; the shell has a second opening; the second frame is snap-fitted to the second opening; the first opening is located inside the second frame; the second frame is connected to the vibration node via the flexible connector.

[0015] Furthermore, the pump body structure of the piezoelectric fan includes at least one of the following:

[0016] a. The cavity is made of plastic;

[0017] b. The cavity is made of plastic and integrally molded using injection molding;

[0018] c. The cavity is made of polyphenylene sulfide, polyetheretherketone, nylon, or liquid crystal polymer;

[0019] d. The flexible connector is a corrugated elastic connector or a cantilever beam with a sheet-like structure; the cantilever beam is made of metal or plastic;

[0020] e. The cavity is provided with reinforcing ribs at the vibration nodes, and the cavity wall is a thin-walled structure;

[0021] f. The number density of the first vent holes decreases gradually from the center of the vibrating diaphragm;

[0022] g. The cavity is made of a non-damping material;

[0023] h. The piezoelectric vibrator has a rectangular structure;

[0024] i. The number density of the first vents near the vibration node is less than the number density of the first vents far from the vibration node; the position of each second vent corresponds to the position of each first vent.

[0025] j. The inlet area of ​​the second vent is greater than or less than the outlet area of ​​the second vent, and the inner diameter of the second vent is greater than the inlet diameter and the outlet diameter of the second vent.

[0026] Secondly, embodiments of this application provide a piezoelectric fan, including the pump body structure of the piezoelectric fan.

[0027] This application provides a pump body structure for a piezoelectric fan and a piezoelectric fan in an embodiment. It employs a piezoelectric vibrator and a cavity. The wall of the first opening of the cavity is connected to the vibration node of the piezoelectric vibrator via a flexible connector, reducing the transmission of vibration from the piezoelectric vibrator to the cavity and thus reducing vibration noise. A second vent is located within the projection of the vibrating part of the piezoelectric vibrator onto the cavity. The first vent, the venting channel, the second vent, and the interior of the piezoelectric vibrator are interconnected, reducing airflow noise generated when gas enters and exits the piezoelectric vibrator. Therefore, this application embodiment can reduce vibration noise and airflow noise generated in the cavity due to pump body vibration of the piezoelectric fan. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of a piezoelectric fan.

[0030] Figure 2 This is an exploded view of a piezoelectric fan.

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of a piezoelectric fan.

[0032] Figure 4This is a schematic diagram of the cross-sectional structure of a compressor fan in the intake state.

[0033] Figure 5 This is a schematic diagram of the cross-sectional structure of a compressor fan in jet mode.

[0034] Figure 6 This is a schematic diagram of the overall structure of a piezoelectric fan with a protective mesh.

[0035] Figure 7 This is a schematic diagram of the distribution structure of the first vent hole of the vibrating diaphragm in one embodiment.

[0036] Figure 8 This is a schematic diagram of the distribution structure of the first vent hole of the vibrating diaphragm in another embodiment.

[0037] Figure 9 This is a schematic diagram of the distribution structure of the first vent hole of the vibrating diaphragm in another embodiment.

[0038] Figure 10 This is a schematic diagram of the distribution structure of the first vent hole of the vibrating diaphragm in another embodiment.

[0039] Figure 11 This is a schematic diagram of the cavity structure in one embodiment.

[0040] Figure 12 This is a schematic diagram of the cavity structure in yet another embodiment.

[0041] Figure 13 This is a schematic diagram of the cavity structure in another embodiment.

[0042] The attached figures are labeled as follows:

[0043] 1. Piezoelectric fan; 2. Flexible connector; 3. Second frame; 4. Piezoelectric vibrator; 5. First frame; 6. First vent; 7. Vibrating diaphragm; 8. Second vent; 9. Cavity; 10. Vibration chamber; 11. Ventilation channel; 12. Inside of piezoelectric vibrator; 13. First vent a; 14. First vent b; 15. First vent c; 16. First vent d; 17. Second vent a; 18. Second vent b; 19. Second vent c; 20. Protective net; 21. Pump body structure; 22. Piezoelectric drive; 23. First opening; 24. Vibration node; 25. Housing; 26. Second opening; 27. First vibration part; 28. Second vibration part; 29. ​​End face; 30. Side wall. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0046] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] Quantity density refers to the quantity per unit area.

[0049] To improve or solve the technical problems of excessive vibration and airflow noise generated by the pump body of piezoelectric fans in related technologies, in a first aspect, embodiments of this application provide a pump body structure 21 for a piezoelectric fan 1, see reference. Figures 1-13 As shown, it includes: a piezoelectric vibrator 4 and a cavity 9; a vibrating diaphragm 7 is provided on one side of the piezoelectric vibrator 4; the vibrating diaphragm 7 is provided with a first vent 6 communicating with the interior of the piezoelectric vibrator; the piezoelectric vibrator has a vibrating node 24; a first opening 23 is provided on one side of the cavity 9; the side of the piezoelectric vibrator 4 near the first vent is located inside the cavity 9, and the wall of the first opening 23 is connected to the vibrating node through a flexible connector 2 so that the piezoelectric vibrator is suspended in the first opening 23; the space between the piezoelectric vibrator 4 and the cavity 9 forms a ventilation channel 11; the cavity is provided with a second vent 8; the first vent 6, the ventilation channel 11, the second vent 8 and the interior of the piezoelectric vibrator 4 are connected; the second vent 8 is located below the vibrating diaphragm 7; in a first state, gas enters the interior of the piezoelectric vibrator through the ventilation channel and the first vent; in a second state, the gas inside the piezoelectric vibrator is discharged through the ventilation channel and the second vent.

[0050] For example, the first state can be an inhalation state, and the second state can be an exhalation state. The wall of the first opening 23 is connected to the vibration node through the flexible connector 2, wherein the wall of the first opening 23 refers to the wall used to form the first opening 23; such as the wall forming the first opening 23 may include a side wall 30, or it may include an end face 29.

[0051] See Figure 11 As shown, the upper opening of cavity 9 is the first opening 23; see reference. Figures 2-5 As shown, the wall of the first opening 23 is connected to the vibration node 24 through the flexible connector 2, so that the piezoelectric vibrator is suspended in the first opening 23; the vibration diaphragm 7 on the lower side of the piezoelectric vibrator 4 is located in the cavity 9, and there is a space between the four sides of the piezoelectric vibrator 4 and the vibration diaphragm 7 of the piezoelectric vibrator 4 and the bottom of the cavity 9, which forms a ventilation channel 11; the bottom of the cavity is provided with a second ventilation hole 8, and the vibration diaphragm is provided with a first ventilation hole 6.

[0052] In the inhalation state, gas enters the ventilation channel 11 from the first opening of the cavity 9, and then enters the first ventilation hole 6 from the bottom of the cavity 9; in the exhalation state, gas is ejected from the inside 12 of the piezoelectric vibrator through the first ventilation hole 6, and then discharged from the second ventilation hole 8.

[0053] During the piezoelectric vibrator's intake and exhaust states, the vibrator continuously vibrates, even at high frequencies. Because the vibration displacement at the vibrating nodes is small, and the flexible connector effectively dissipates most of the vibrational energy transmitted from these nodes, the amount of vibrational energy transmitted to the cavity is significantly reduced. The connection between the flexible connector and the vibrating nodes reduces the vibration transmitted to the cavity, minimizing external influences on the piezoelectric fan. It also avoids vibration losses caused by significant energy transfer to the cavity, allowing the piezoelectric vibrator to use its energy more effectively for propelling the gas in and out. This ensures efficient, low-power, and stable operation of the piezoelectric fan, and greatly reduces vibration noise generated in the cavity due to the piezoelectric vibrator's vibration.

[0054] Therefore, by employing a piezoelectric vibrator and a cavity, the wall of the first opening of the cavity is connected to the vibration node of the piezoelectric vibrator through a flexible connector, reducing the transmission of the vibration of the piezoelectric vibrator to the cavity, thereby reducing the vibration noise of the cavity. Furthermore, by using a second vent located within the projection of the vibration part of the piezoelectric vibrator within the cavity, and by connecting the first vent, the venting channel, the second vent, and the interior of the piezoelectric vibrator, the airflow noise generated when gas enters and exits the piezoelectric vibrator is reduced. Thus, this embodiment can reduce the vibration noise and airflow noise generated in the cavity due to the vibration of the piezoelectric fan's pump body.

[0055] See Figure 6 As shown, optionally, the piezoelectric fan is provided with a protective net 20.

[0056] Optionally, the number density of the first vent near the vibration node is less than the number density of the first vent far from the vibration node.

[0057] Optionally, the number density of the first vent holes decreases in a gradient from the center of the vibrating membrane.

[0058] By employing the above method, reducing or eliminating the placement of the first vent at the vibration node can prevent damage to the piezoelectric vibrator's structure. This method, through optimizing the distribution of the first and second vents, increases gas flow, reduces airflow vortices and mutual impacts, resulting in smoother airflow during gas entry and exit from the piezoelectric vibrator and effectively reducing aerodynamic noise.

[0059] Optionally, the vibrating part includes a first vibrating part 27 and a second vibrating part 28; the amplitude of the first vibrating part is a first amplitude; the amplitude of the second vibrating part is a second amplitude; the first amplitude is greater than the second amplitude; the number of the first vent holes is multiple; the number density of the first vent holes in the first vibrating part is greater than the number density of the first vent holes in the second vibrating part.

[0060] Optionally, see Figure 7 As shown, the first vent includes a plurality of first vents a 13, which are arranged in a rectangular pattern of three horizontal and five vertical. The number density of the first vents in the first vibration part 27 is greater than that in the second vibration part 28.

[0061] Optionally, the diameter of the first vent in the first vibration part 27 is larger than the diameter of the first vent in the second vibration part 28.

[0062] The above method allows us to correlate the location and density of the first vent holes with the standing wave nodes and antinode regions during piezoelectric oscillator operation. Arranging denser or larger first vent holes in the antinode regions where vibration displacement amplitude is greatest enhances the pumping effect.

[0063] Optionally, see Figure 8 As shown, the first vent includes a plurality of first vents b 14, which are distributed in a circular pattern; the number density of the first vents in the first vibration part 27 is greater than the number density of the first vents in the second vibration part 28.

[0064] Optionally, see Figure 9As shown, the first vent includes multiple first vents c 15, which are distributed in a rhomboid shape. The upper and lower ends of the rhomboid distribution are close to the two vibration nodes, and the number of first vents c 15 at the upper and lower ends of the rhomboid distribution is the least. The number density of first vents in the first vibration part 27 is greater than that in the second vibration part 28.

[0065] Optionally, see Figure 10 As shown, the first vent includes a plurality of first vents d 16, which are rectangularly distributed with two tips at the top and bottom. The two tips of this distribution are close to the two vibration nodes respectively. The number of first vents d 16 at the two tips of this distribution is the smallest. The number density of first vents in the first vibration part 27 is greater than that in the second vibration part 28.

[0066] The first vent, distributed in the aforementioned manner, allows most of the gas with significant vibrational energy in the piezoelectric vibrator to be expelled more quickly. This reduces vibrational energy loss, ensuring that the majority of the input electrical energy is used to drive airflow, thus lowering overall power consumption and improving the heat dissipation efficiency of the piezoelectric fan. This method also enables the piezoelectric vibrator's mechanical energy to be converted into the kinetic energy of the gas more efficiently, significantly improving pumping efficiency and output air pressure.

[0067] Understandably, the first vent can also be distributed in other ways.

[0068] Optionally, the diameter of the first vent can be set to 0.3-1mm, such as 0.3mm, 0.4mm, 0.8mm, or 1mm, and the diameter of the second vent can be set to 0.1-0.8mm, such as 0.1mm, 0.4mm, 0.6mm, or 0.8mm. The distance between the centers of two adjacent first vents can be set to 0.2-1.5mm, such as 0.2mm, 0.4mm, 0.6mm, 0.9mm, 1.0mm, 1.2mm, or 1.5mm. The appropriate aperture size can be selected according to the parameters of the piezoelectric vibrator to reduce airflow noise and shorten the path of airflow into and out of the piezoelectric vibrator. It is understood that the shapes of the first and second vents can be triangular, rectangular, oblong, polygonal, elliptical, or petal-shaped, etc., as needed, and are not limited here.

[0069] The second vent 8 is located below the vibrating diaphragm 7. Optionally, the second vent 8 is located within the vibration projection position; the vibration projection position refers to the position where the projection formed by light projecting onto the cavity from the vibrating part of the vibrating diaphragm.

[0070] It is understandable that the projection in the vibration projection position can refer to an orthographic projection, parallel projection, central projection, oblique projection, etc., as long as the second vent is located within this vibration projection position. Positioning the second vent within this vibration projection position ensures a shorter distance between the outlet of the first vent on the vibrating diaphragm and the outlet of the second vent. Optionally, this projection is an orthographic projection. This method allows the gas inside the piezoelectric vibrator 12 to have a shorter exhaust path through the first vent to the second vent. This design ensures that the vibration energy is used most effectively for pumping, allowing most of the gas with high vibration energy to exit through the second vent. This largely avoids collisions between the gas entering the cavity 9 and the gas with vibration energy exiting from the piezoelectric vibrator 12 during intake and exhaust states, thereby significantly reducing airflow noise generated when gas enters and exits the piezoelectric vibrator.

[0071] Optionally, the vibration projection position includes a first vibration projection position and a second vibration projection position; the first vibration projection position corresponds to the first vibration part; the second vibration projection position corresponds to the second vibration part; the number of second vents is multiple, and the number density of second vents in the first vibration projection position is greater than the number density of second vents in the second vibration projection position.

[0072] The second vent is provided corresponding to the first and second vibration parts, which allows the gas discharged from the piezoelectric vibrator to enter the second vent through a smaller path and be discharged.

[0073] Optionally, the positions of each second vent correspond to the positions of each first vent.

[0074] The number and location distribution of the second vents correspond to the rectangular, circular, and rectangular distributions with two sharp points at the top and bottom of the first vents. This can form an efficient pumping structure, reduce the flow channel length and flow loss, and enable the airflow pumped from each first vent to exit from the corresponding outlet with the shortest path and least resistance, thus forming several independent and efficient airflow inlet and outlet channels.

[0075] Optionally, the inlet area of ​​the second vent is smaller than the outlet area of ​​the second vent. See also... Figure 11 As shown, the second vent includes multiple second vents a 17. The cross-sectional shape of the second vent a 17 is an isosceles trapezoid. The area of ​​the air inlet above the second vent a 17 is smaller than the area of ​​the air outlet below the second vent a 17.

[0076] Optionally, the inlet area of ​​the second vent is larger than the outlet area of ​​the second vent. See also... Figure 12As shown, the second vent includes multiple second vents b 18. The cross-sectional shape of the second vent b 18 is an isosceles trapezoid. The area of ​​the air inlet above the second vent b 18 is larger than the area of ​​the air outlet below the second vent b 18.

[0077] Optionally, the inner diameter of the second vent is larger than the inlet diameter and outlet diameter of the second vent. See also Figure 13 As shown, the second vent includes multiple second vents c 19. The cross-sectional shape of the second vent c 19 is a channel that is narrow in the middle and wide at both ends. The left and right sides of this cross-sectional shape are arc-shaped structures. The area of ​​the air inlet above the second vent c 19 is equal to the area of ​​the air outlet below the second vent c 19.

[0078] The cross-sectional shape of the second vent is designed in the manner described above to reduce airflow noise and allow the airflow in the piezoelectric vibrator to exit from the second vent through a shorter path and in a shorter time. The specific shape can be adjusted according to the actual situation.

[0079] It is understandable that the cross-sectional shape of the second vent can also be other shapes, and no limitation is made here.

[0080] Furthermore, the piezoelectric vibrator also includes a piezoelectric drive 22 and a first frame 5; the piezoelectric drive 22, the first frame 5, and the vibrating diaphragm form a vibration chamber 10; the piezoelectric drive 22 is located on the upper side of the vibrating diaphragm; the piezoelectric drive is connected to the wall of the first opening of the chamber through a flexible connector.

[0081] It is understood that piezoelectric actuators may include piezoelectric ceramic sheets. Optionally, the core functional layer of the piezoelectric ceramic sheet is made of a material with a piezoelectric effect (such as lead zirconate titanate ceramic). When energized, the ceramic sheet undergoes expansion and contraction deformation in a specific direction (inverse piezoelectric effect); after de-energization, it returns to its original shape, driving overall vibration through high-frequency reciprocating deformation. When an alternating voltage is applied to the piezoelectric ceramic sheet, the diaphragm begins to vibrate significantly, generating airflow. At this time, the vibration energy is confined to the piezoelectric oscillator itself, with a small amount of vibration energy absorbed and isolated by flexible connectors.

[0082] Furthermore, the central axis of the piezoelectric vibrator coincides with the central axis of the cavity, and the piezoelectric vibrator includes two vibration nodes; the line connecting the two vibration nodes intersects the central axis of the cavity, and the two vibration nodes are respectively connected to the wall of the first opening of the cavity through flexible connectors so that the piezoelectric vibrator is suspended in the first opening.

[0083] See Figures 1-3 As shown, the two vibration nodes 24 on the upper and lower sides of the piezoelectric vibrator are positioned opposite each other, and the two vibration nodes are connected to the cavity through the flexible connector 2 respectively.

[0084] Optionally, the piezoelectric vibrator has a rectangular structure; the central axis of the piezoelectric vibrator coincides with the central axis of the cavity, and the line connecting the two vibration nodes 24 is parallel to the two opposite sides of the piezoelectric vibrator and passes through the central axis of the piezoelectric vibrator.

[0085] Optionally, the piezoelectric vibrator is a rectangular thin plate with both ends fixed to the cavity. Its operating mode can be first-order bending vibration, with the central antinodes exhibiting the largest vibration amplitude and the nodes near the fixed ends. Optionally, the distribution of the first vent holes adopts a modal matching distribution, that is, in the central antinode region of the vibrator, the first vent holes are arranged with a higher density; the number density of the first vent holes gradually decreases until it reaches zero as it approaches the vibration nodes on the left and right sides.

[0086] By adopting the above method, unnecessary torsional vibration or higher-order vibration modes of the piezoelectric vibrator can be improved, reducing energy conversion efficiency and increasing noise; and the vibration of certain areas of the piezoelectric vibrator can be avoided from failing to effectively participate in the pumping process, resulting in material waste and performance loss.

[0087] When a piezoelectric fan is operating, its piezoelectric vibrator (a combination of piezoelectric ceramic / film and diaphragm) generates high-frequency mechanical vibrations. This vibrational energy is transmitted to the entire casing through fixed points, causing harmful vibrations in the cavity and even the piezoelectric fan itself, affecting user experience and the normal operation of other precision components. Existing solutions often use soft damping materials (such as silicone or foam) to reduce vibration. While this can isolate some vibrations, it also absorbs and dissipates a large amount of driving energy, leading to decreased fan performance, a significant increase in overall power consumption, and the damping material itself generating heat, which actually exacerbates the thermal load. The embodiments of this application employ flexible connectors and vibration node connections, which can improve or solve the above problems.

[0088] It is understandable that a flexible connector can be a flexible support structure. A flexible support structure is an elastic component with extremely low stiffness in the vibration direction (such as the direction of oscillator vibration), allowing the oscillator to vibrate freely; while it has high stiffness in other directions (such as the lateral movement direction within the diaphragm plane), providing stable support.

[0089] A vibration node is a specific location on a piezoelectric oscillator where its vibration displacement is zero or close to zero at the target operating frequency. This node can be precisely determined in advance through finite element analysis (FEA) and laser vibration measurement experiments. Optionally, modal analysis of the piezoelectric oscillator at the operating frequency (e.g., 10 kHz) can be performed using simulation software to determine two vibration nodes of its first-order bending mode, which can then be used as vibration nodes for connection with flexible connectors.

[0090] In some embodiments, the flexible connector includes a bending hinge; the vibration node of the piezoelectric vibrator is connected to the cavity via the bending hinge. The bending hinge is an elastic structure with specific cuts, manufactured using processes such as wire cutting, which provides precise degrees of freedom of rotation about the axis, facilitating the absorption of vibrational energy transmitted from the piezoelectric vibrator.

[0091] In some embodiments, the flexible connector includes an elastic connector; the vibration node of the piezoelectric vibrator is connected to the cavity through the elastic connector.

[0092] It is understood that the flexible connector can be a corrugated elastic connector or a cantilever beam with a sheet-like structure; the cantilever beam is made of metal or plastic. Optionally, the corrugated elastic connector can be an "S"-shaped or serpentine elastic connector, which can absorb vibration energy through its own deformation.

[0093] Optionally, the natural frequency of the cavity is different from the operating frequency of the piezoelectric vibrator to avoid resonance between the two.

[0094] Furthermore, the cavity includes a housing 25 and a second frame 3; the housing 25 has a second opening 26; the second frame 3 is snapped together with the second opening 26; the first opening is located inside the second frame 3; the second frame is connected to the vibration node through a flexible connector.

[0095] In related technologies, the cavity of piezoelectric fans is mostly made of metal (such as aluminum alloy or stainless steel) or ceramic materials. Metal shells have advantages such as high strength and good thermal conductivity, but they are not conducive to overall device lightweighting. Furthermore, the precision machining process for metal cavities is complex and time-consuming, resulting in high unit costs. In addition, complex three-dimensional flow channels and mounting positions are difficult to integrally mold on a metal cavity, usually requiring assembly of multiple parts, increasing sealing risks and assembly costs.

[0096] Optionally, the cavity is made of plastic; alternatively, the cavity is integrally molded into an insulating plastic shell using a mixture of polyphenylene sulfide and glass fiber materials, with a mass ratio of polyphenylene sulfide to glass fiber materials of 1:0.4.

[0097] The use of plastic for the cavity simplifies the structure, allows for greater design freedom, and achieves lightweighting, noise reduction, heat insulation, low cost, and electrical insulation. Plastic's density is significantly lower than metal, enabling a lightweight pump structure. The insulating properties of the plastic cavity eliminate the risk of high-voltage breakdown, improving the piezoelectric fan's operational safety and long-term reliability in harsh environments such as humidity and dust. The cavity is integrally molded using injection molding, resulting in low airflow noise and vibration damping. Injection molding significantly reduces unit cost and time costs for mass production, facilitating the commercialization of the technology. The cavity material can be polyphenylene sulfide, polyetheretherketone, nylon, or liquid crystal polymers. These materials not only meet mechanical performance requirements but also, due to their inherent high insulation properties, completely eliminate the possibility of short circuits between the high-voltage electrodes of the piezoelectric vibrator and the cavity. Optionally, the cavity material can also be a non-damping material.

[0098] Optionally, the vibration nodes of the cavity are provided with reinforcing ribs, and the walls of the cavity are thin-walled structures.

[0099] The cavity utilizes the high internal damping properties of plastic as a vibration damper. Specific areas of the outer shell (such as the area corresponding to the oscillator fixing point) can be designed with reinforcing ribs to maintain rigidity, while other large areas can maintain a thin-walled design to maximize the absorption and dissipation of vibration energy and reduce noise.

[0100] Secondly, this application provides a piezoelectric fan, see reference. Figures 1-13 As shown, the pump body structure includes a piezoelectric fan.

[0101] The functions and effects of the technical features in this technical solution that are similar to or related to the aforementioned technical solution are similar to those in the aforementioned technical solution, and the inventive concept and beneficial effects of this technical solution are similar to those in the aforementioned technical solution, so they will not be repeated here.

[0102] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pump body structure for a piezoelectric fan, characterized in that, include: piezoelectric vibrator; A vibrating diaphragm is provided on one side of the piezoelectric vibrator; the vibrating diaphragm is provided with a first vent hole communicating with the interior of the piezoelectric vibrator; The piezoelectric vibrator has a vibration node; A cavity; one side of the cavity has a first opening; the side of the piezoelectric vibrator near the first vent is located inside the cavity, and the wall of the first opening is connected to the vibration node through a flexible connector so that the piezoelectric vibrator is suspended in the first opening; the space between the piezoelectric vibrator and the cavity forms a ventilation channel; the cavity is provided with a second vent. The first vent, the venting channel, the second vent, and the internal structure of the piezoelectric vibrator are interconnected; the second vent is located below the vibrating diaphragm.

2. The pump body structure of the piezoelectric fan as described in claim 1, characterized in that, The second vent is located within the vibration projection position; the vibration projection position refers to the position where the projection formed by light projecting onto the cavity from the vibrating part of the vibrating diaphragm; the vibrating part includes a first vibrating part and a second vibrating part; the amplitude of the first vibrating part is a first amplitude; the amplitude of the second vibrating part is a second amplitude; the first amplitude is greater than the second amplitude; there are multiple first vents; the number density of the first vents in the first vibrating part is greater than the number density of the first vents in the second vibrating part.

3. The pump body structure of the piezoelectric fan as described in claim 2, characterized in that, The vibration projection position includes a first vibration projection position and a second vibration projection position; the first vibration projection position corresponds to the first vibration part; the second vibration projection position corresponds to the second vibration part; there are multiple second vents, and the number density of the second vents in the first vibration projection position is greater than the number density of the second vents in the second vibration projection position.

4. The pump body structure of the piezoelectric fan as described in claim 3, characterized in that, The piezoelectric vibrator further includes: a piezoelectric drive element and a first frame; the piezoelectric drive element, the first frame, and the vibrating diaphragm form a vibration chamber; the piezoelectric drive element is located on the opposite side of the vibrating diaphragm; the piezoelectric drive element is connected to the wall of the first opening of the chamber via a flexible connector.

5. The pump body structure of the piezoelectric fan as described in claim 1, characterized in that, The central axis of the piezoelectric vibrator coincides with the central axis of the cavity. The piezoelectric vibrator includes two vibration nodes. The line connecting the two vibration nodes intersects the central axis of the cavity. The two vibration nodes are respectively connected to the wall of the first opening of the cavity through the flexible connector so that the piezoelectric vibrator is suspended in the first opening.

6. The pump body structure of the piezoelectric fan as described in any one of claims 1-5, characterized in that, The flexible connector includes a bending hinge; the vibration node of the piezoelectric vibrator is connected to the cavity through the bending hinge.

7. The pump body structure of the piezoelectric fan as described in any one of claims 1-5, characterized in that, The flexible connector includes an elastic connector; the vibration node of the piezoelectric vibrator is connected to the cavity through the elastic connector.

8. The pump body structure of the piezoelectric fan as described in any one of claims 1-5, characterized in that, The cavity includes a shell and a second frame; the shell has a second opening; the second frame is snap-fitted to the second opening; the first opening is located inside the second frame; the second frame is connected to the vibration node via the flexible connector.

9. The pump body structure of the piezoelectric fan as described in claim 8, characterized in that, It has at least one of the following: a. The cavity is made of plastic; b. The cavity is made of plastic and integrally molded using injection molding; c. The cavity is made of polyphenylene sulfide, polyetheretherketone, nylon, or liquid crystal polymer; d. The flexible connector is a corrugated elastic connector or a cantilever beam with a sheet-like structure; the cantilever beam is made of metal or plastic; e. The cavity is provided with reinforcing ribs at the vibration nodes, and the cavity wall is a thin-walled structure; f. The number density of the first vent holes decreases gradually from the center of the vibrating diaphragm; g. The cavity is made of a non-damping material; h. The piezoelectric vibrator has a rectangular structure; i. The number density of the first vents near the vibration node is less than the number density of the first vents far from the vibration node; the position of each second vent corresponds to the position of each first vent. j. The inlet area of ​​the second vent is greater than or less than the outlet area of ​​the second vent, and the inner diameter of the second vent is greater than the inlet diameter and the outlet diameter of the second vent.

10. A piezoelectric fan, characterized in that, The pump body structure includes the piezoelectric fan as described in any one of claims 1-9.

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