piezoelectric fluid drive device

Abstract

This invention belongs to the field of fluid drive technology, and particularly relates to piezoelectric fluid drive. This invention provides a piezoelectric fluid drive device, comprising: a housing assembly having at least one air inlet and at least one air outlet; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet, an elastomer, and a displacement amplifier stacked sequentially along the axial direction; and an electrical connector electrically connected to the piezoelectric ceramic sheet. This invention, by setting a cymbal-shaped displacement amplifier, efficiently amplifies the minute deformation of the piezoelectric ceramic sheet into a large axial displacement of the central boss, increasing the fluid volume per cycle; furthermore, its smooth arc-shaped structure simultaneously achieves uniform stress distribution, effectively avoiding stress concentration at the connection points.

Description

Technical Field

[0001] This invention belongs to the field of fluid drive technology, specifically relating to piezoelectric fluid drive, and more particularly to a piezoelectric fluid drive device. Background Technology

[0002] Piezoelectric fluid drive devices utilize the inverse piezoelectric effect of piezoelectric materials to directly convert electrical energy into mechanical vibrations, thereby driving fluids. They are widely used in microfluidic control systems, precision medical devices, and heat dissipation for electronic equipment.

[0003] Existing fluid drive devices based on piezoelectric oscillators mostly use flat piezoelectric oscillators or simple displacement transmission structures. This results in a limited amplification factor of the axial displacement when the axial expansion and contraction deformation of the piezoelectric ceramic is transmitted to the fluid drive end face. Consequently, it is difficult to increase the fluid flow rate or pressure output in a single cycle, making it difficult to meet the application requirements for high-performance drives.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one piezoelectric fluid drive device to solve the above-mentioned technical problems.

[0006] In a first aspect, embodiments of this disclosure provide a piezoelectric fluid drive device, comprising: a housing assembly having at least one air inlet and at least one air outlet; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet, an elastomer, and a displacement amplifier stacked sequentially along the axial direction; and an electrical connector electrically connected to the piezoelectric ceramic sheet; the elastomer comprising a fixing portion, a vibrating portion, and a spring wire structure connecting the fixing portion and the vibrating portion; the displacement amplifier comprising an edge fixing region, an arc-shaped transition region, and a central boss, the edge fixing region being fixed to the edge of the vibrating portion, the arc-shaped transition region extending smoothly from the edge fixing region to the central boss, the central boss and / or the arc-shaped transition region having at least one air jet hole, the axis of the air jet hole being parallel to the axial direction of the displacement amplifier; wherein the axis of the air outlet is coaxial with the axis of the air jet hole.

[0007] In one alternative embodiment, the housing assembly includes an upper shell and a base, the base engaging with the upper shell to form a chamber for accommodating a resonator.

[0008] In one optional embodiment, the air inlet is disposed on the side of the base, and the air outlet is disposed on the bottom surface of the base; the air inlet is disposed on the top surface of the upper shell, and the air outlet is disposed on the bottom surface of the base; both the air inlet and the air outlet are disposed on the bottom surface of the base; the air inlet is disposed on the top surface of the upper shell, the air outlet is disposed on the bottom surface of the base, and a nozzle is disposed at the air outlet position, and the number of the air outlet and the jet hole is three; the air inlet is disposed on the top surface of the upper shell, the air outlet is disposed on the bottom surface of the base, and the number of the air outlet and the jet hole is five; the air inlet is disposed on the top surface of the upper shell, the air outlet is disposed on the bottom surface of the base, the number of the air outlet and the jet hole is five, and a bottom shell is disposed below the base, and a spiral channel is disposed inside the bottom shell communicating with the air outlet.

[0009] In one alternative implementation, the displacement amplifier has a cymbal-shaped structure.

[0010] In one alternative embodiment, the base is provided with a clearance groove to provide space for the deformation of the central boss.

[0011] Secondly, this disclosure also provides a piezoelectric fluid drive device, comprising: a housing assembly having at least one air inlet and at least one air outlet; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet, an elastomer, and a displacement amplifier stacked sequentially along the axial direction; an electrical connector electrically connected to the piezoelectric ceramic sheet; and at least one valve assembly disposed on a central boss of the displacement amplifier; the elastomer comprising a fixing portion, a vibrating portion, and a spring wire structure connecting the fixing portion and the vibrating portion; the displacement amplifier comprising an edge fixing region, The arc-shaped transition area and the central boss are provided. The edge fixing area is fixed to the edge of the vibrating part. The arc-shaped transition area extends smoothly from the edge fixing area to the central boss. The central boss is provided with at least one air jet hole. The vibrating part is provided with an air intake hole. The valve assembly includes a valve plate, a gasket, and a protective cover. The valve plate, gasket, and protective cover are stacked sequentially along the axial direction. The valve plate is fixed to the central boss. The valve plate is provided with a first through hole. The protective cover is provided with a second through hole. The projection of the first through hole does not coincide with the projection of the air jet hole. The projection of the second through hole coincides with the projection of the air jet hole.

[0012] In one alternative implementation, the displacement amplifier has a cymbal-shaped structure.

[0013] In one alternative embodiment, the housing assembly includes an upper shell and a base, the base engaging with the upper shell to form a chamber for accommodating the resonator and valve assembly.

[0014] In one optional embodiment, the air inlet is disposed on the top surface of the upper shell, and the air outlet is disposed on the bottom surface of the base; both the air inlet and the air outlet are disposed on both sides of the base, wherein the air inlet communicates with the space between the upper shell and the resonator, and the air outlet communicates with the space between the base and the resonator; the air inlet is disposed on the top surface of the upper shell, and the air outlet is disposed on the bottom surface of the base; and two valve assemblies are disposed on the central boss, one valve assembly is disposed between the central boss and the vibrating part, and the other valve assembly is disposed on the... The central boss is located between the base and the piezoelectric ceramic sheet, and an opening corresponding to the air inlet is provided on the piezoelectric ceramic sheet. The air inlet and the air outlet are both located on both sides of the base. The air inlet communicates with the space between the upper shell and the resonator, and the air outlet communicates with the space between the base and the resonator. Two valve assemblies are provided on the central boss, one valve assembly is located between the central boss and the vibrating part, and the other valve assembly is located between the central boss and the base. The piezoelectric ceramic sheet has an opening corresponding to the air inlet.

[0015] In one alternative embodiment, the base is provided with a clearance groove to provide space for the deformation of the central boss.

[0016] The beneficial effects of the present invention are that it provides a piezoelectric fluid drive device, which, by setting a cymbal-shaped displacement amplifier, realizes the efficient amplification of the small deformation of the piezoelectric ceramic sheet into a large axial displacement of the central boss, thereby increasing the fluid volume in a single cycle; in addition, its smooth arc structure also realizes the uniform distribution of stress, effectively avoiding stress concentration at the connection parts.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A perspective view of a circular piezoelectric fluid drive device provided in an embodiment of this disclosure; Figure 2 A perspective view of a square piezoelectric fluid drive device provided in an embodiment of this disclosure; Figure 3 An exploded view of the piezoelectric fluid drive device provided in Embodiment 1 of this disclosure; Figure 4 This is an exploded view of the piezoelectric fluid drive device provided in Embodiment 2 of this disclosure; Figure 5 An exploded view of the piezoelectric fluid drive device provided in Embodiment 3 of this disclosure; Figure 6 This is an exploded view of the piezoelectric fluid drive device provided in Embodiment 4 of this disclosure; Figure 7 An exploded view of the piezoelectric fluid drive device provided in Embodiment 5 of this disclosure; Figure 8 This is an exploded view of the circular piezoelectric fluid drive device provided in Embodiment Six of this disclosure; Figure 9 This is an exploded view of the square piezoelectric fluid drive device provided in Embodiment Six of this disclosure; Figure 10 An exploded view of the piezoelectric fluid drive device provided in Embodiment 7 of this disclosure; Figure 11 An exploded view of the piezoelectric fluid drive device provided in Embodiment 8 of this disclosure; Figure 12 An exploded view of the piezoelectric fluid drive device provided in Embodiment 9 of this disclosure; Figure 13 An exploded view of the piezoelectric fluid drive device provided in Embodiment 10 of this disclosure; Figure 14 A perspective view of a valve assembly provided in an embodiment of this disclosure.

[0021] In the picture: 1. Top shell; 2. Base; 21. Nozzle; 22. Bottom shell; 23. Spiral channel; 3. Electrical connectors; 4. Piezoelectric ceramic sheet; 41. Opening; 5. Elastomer; 51. Fixing part; 52. Elastic wire structure; 53. Vibrating part; 54. Air intake hole; 6. Displacement amplifier; 61. Edge fixing area; 62. Arc-shaped transition area; 63. Central boss; 64. Air jet hole; 7. Air intake; 8. Air vent; 9. Valve assembly; 91. Valve plate; 92. Gasket; 93. Protective cover; 94. First through hole; 95. Second through hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0024] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0025] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0026] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0027] Research has revealed the shortcomings of existing technologies: piezoelectric fluid drive devices utilize the inverse piezoelectric effect of piezoelectric materials to directly convert electrical energy into mechanical vibration, thereby driving fluids. They are widely used in microfluidic control systems, precision medical devices, and heat dissipation for electronic equipment.

[0028] Existing fluid drive devices based on piezoelectric oscillators mostly use flat piezoelectric oscillators or simple displacement transmission structures. This results in a limited amplification factor of the axial displacement when the axial expansion and contraction deformation of the piezoelectric ceramic is transmitted to the fluid drive end face. Consequently, it is difficult to increase the fluid flow rate or pressure output in a single cycle, making it difficult to meet the application requirements for high-performance drives.

[0029] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] Figures 1 to 8 A valveless fluid drive device is provided.

[0033] Example 1: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a cavity to accommodate a resonator.

[0034] In order to provide sufficient space for the large displacement of the central boss 63 during vibration and to avoid collision with the base 2, the base 2 is provided with a clearance groove to provide space for the deformation of the central boss 63. The depth of this clearance groove is slightly greater than the maximum vibration stroke of the central boss 63, which ensures smooth vibration and reduces noise and energy loss caused by collision.

[0035] The upper shell 1 and the base 2 are connected by a snap-fit ​​to form a sealed or semi-sealed chamber, which is used to house and protect the internal resonators and other precision components.

[0036] The resonator, which is disposed within the housing assembly, includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3, which is electrically connected to the piezoelectric ceramic sheet 4. The electrical connector 3 is electrically connected to the piezoelectric ceramic sheet 4 and is used to input an external AC signal into the piezoelectric ceramic sheet 4. When an alternating voltage is applied to the piezoelectric ceramic sheet 4, due to its inverse piezoelectric effect, the piezoelectric ceramic sheet 4 will undergo periodic expansion and contraction deformation in the thickness direction, thereby exciting the axial bending vibration of the entire resonator 1.

[0037] The elastomer 5 includes a fixed part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixed part 51 and the vibrating part 53; the elastomer 5 is a key energy transmission and conversion component.

[0038] The elastic wire structure 52 is composed of multiple slender elastic beams with specific shapes (such as arc or S-shape) that are evenly distributed circumferentially. It provides the necessary flexibility, allowing the vibrating part 53 to undergo large-amplitude axial vibration relative to the fixed part 51, which is the basis for realizing displacement amplification. In addition, the flexible connection of the elastic wire structure 52 can effectively isolate the vibration of the vibrating part 53 from the transmission to the fixed part 51, reduce the energy dissipation to the shell, and improve the driving efficiency.

[0039] The displacement amplifier 6 has a cymbal-shaped structure. Specifically, the displacement amplifier 6 includes an edge fixing area 61, an arc-shaped transition area 62, and a central boss 63. The edge fixing area 61 is fixed to the edge of the vibration part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. At least one jet hole 64 is provided on the central boss 63 and / or the arc-shaped transition area 62. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64. The coaxial design ensures that the high-speed airflow ejected from the jet hole 64 can directly enter the air outlet 8.

[0040] The edge fixing area 61 is connected to the edge of the vibrating part 53 of the elastic body 5, thereby inheriting the vibration displacement of the vibrating part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. Its cross-section is a continuous arc curve, forming a contour similar to a "cymbal" or "hat". Therefore, the displacement amplifier 6 as a whole can be called a cymbal-shaped structure.

[0041] The central boss 63 is the final part of the displacement output, and it is provided with at least one jet hole 64. When the vibrating part 53 drives the edge fixing area 61 to vibrate axially, due to the thin plate bending effect of the arc transition area 62, the small axial displacement of the edge is amplified and transmitted to the central boss 63, which is transformed into a larger axial displacement of the central boss 63. This achieves efficient mechanical displacement amplification, making the amplitude of the central boss 63 much larger than the expansion and contraction of the piezoelectric ceramic sheet 4 itself, thereby driving more fluid and significantly improving the output flow and pressure of the device.

[0042] Meanwhile, the smooth arc transition zone 62 avoids sharp geometric abrupt changes, making the stress distribution more uniform, effectively alleviating the stress concentration problem in the connection area between the vibration part 53 and the displacement amplifier 6 (i.e., the edge fixing area 61), protecting the piezoelectric ceramic sheet 4 and the connection interface, and greatly improving the reliability and fatigue resistance of the device.

[0043] Specifically, the air inlet 7 is located on the side of the base 2, and the air outlet 8 is located on the bottom surface of the base 2; this facilitates air intake from the side of the device and centralized exhaust from the bottom.

[0044] During operation, the drive circuit applies an alternating voltage of a specific frequency to the piezoelectric ceramic sheet 4 through the electrical connector 3. The piezoelectric ceramic sheet 4 generates periodic expansion and contraction, driving the vibration part 53 of the elastic body 5 to perform axial bending vibration. The vibration of the vibration part 53 is transmitted to the displacement amplifier 6 through the edge fixing area 61. The arc-shaped transition area 62 of the displacement amplifier 6 amplifies the vibration displacement of the edge, driving the central boss 63 to make a large-amplitude axial reciprocating motion. When the central boss 63 moves away from the base 2, the pressure in the cavity below the central boss 63 (connected to the air outlet 8) decreases. When the central boss 63 moves closer to the base 2 (compression stroke), the pressure in the cavity below it increases, causing the gas to be ejected at high speed from the jet hole 64 and discharged through the coaxial air outlet 8, forming a net flow output.

[0045] Example 2: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a chamber to accommodate a resonator; the base 2 is provided with a clearance groove for providing space for the deformation of the central boss 63.

[0046] The resonator is disposed within the housing assembly and includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; the elastic body 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 has a cymbal-shaped structure.

[0047] The displacement amplifier 6 includes an edge fixing region 61, an arc-shaped transition region 62, and a central boss 63. The edge fixing region 61 is fixed to the edge of the vibration part 53. The arc-shaped transition region 62 extends smoothly from the edge fixing region 61 to the central boss 63. The central boss 63 is provided with at least one jet hole 64. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64.

[0048] Specifically, the air inlet 7 is located on the top surface of the upper shell 1, and the air outlet 8 is located on the bottom surface of the base 2.

[0049] Example 3: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a chamber to accommodate a resonator; the base 2 is provided with a clearance groove for providing space for the deformation of the central boss 63.

[0050] The resonator is disposed within the housing assembly and includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; the elastic body 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 has a cymbal-shaped structure.

[0051] The displacement amplifier 6 includes an edge fixing region 61, an arc-shaped transition region 62, and a central boss 63. The edge fixing region 61 is fixed to the edge of the vibration part 53. The arc-shaped transition region 62 extends smoothly from the edge fixing region 61 to the central boss 63. The central boss 63 is provided with at least one jet hole 64. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64.

[0052] Specifically, both the air inlet 7 and the air outlet 8 are located on the bottom surface of the base 2.

[0053] Example 4: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a chamber to accommodate a resonator; the base 2 is provided with a clearance groove for providing space for the deformation of the central boss 63.

[0054] The resonator is disposed within the housing assembly and includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; the elastic body 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 has a cymbal-shaped structure.

[0055] The displacement amplifier 6 includes an edge fixing region 61, an arc-shaped transition region 62, and a central boss 63. The edge fixing region 61 is fixed to the edge of the vibration part 53. The arc-shaped transition region 62 extends smoothly from the edge fixing region 61 to the central boss 63. The central boss 63 is provided with at least one jet hole 64. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64.

[0056] Specifically, the air inlet 7 is located on the top surface of the upper shell 1, the air outlet 8 is located on the bottom surface of the base 2, the air outlet 8 is equipped with a nozzle 21, and the number of air outlets 8 and jet holes 64 is three.

[0057] Example 5: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a chamber to accommodate a resonator; the base 2 is provided with a clearance groove for providing space for the deformation of the central boss 63.

[0058] The resonator is disposed within the housing assembly and includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; the elastic body 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 has a cymbal-shaped structure.

[0059] The displacement amplifier 6 includes an edge fixing region 61, an arc-shaped transition region 62, and a central boss 63. The edge fixing region 61 is fixed to the edge of the vibration part 53. The arc-shaped transition region 62 extends smoothly from the edge fixing region 61 to the central boss 63. The central boss 63 is provided with at least one jet hole 64. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64.

[0060] Specifically, the air inlet 7 is located on the top surface of the upper shell 1, the air outlet 8 is located on the bottom surface of the base 2, and the number of air outlets 8 and jet holes 64 is five.

[0061] Example 6: A piezoelectric fluid drive device is provided, including: a housing assembly, the housing assembly having at least one air inlet 7 and at least one air outlet 8; the housing assembly includes an upper shell 1 and a base 2, the base 2 and the upper shell 1 being fastened together to form a chamber to accommodate a resonator; the base 2 is provided with a clearance groove for providing space for the deformation of the central boss 63.

[0062] The resonator is disposed within the housing assembly and includes a piezoelectric ceramic sheet 4, an elastic body 5, and a displacement amplifier 6 stacked sequentially along the axial direction; and an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; the elastic body 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 has a cymbal-shaped structure.

[0063] The displacement amplifier 6 includes an edge fixing region 61, an arc-shaped transition region 62, and a central boss 63. The edge fixing region 61 is fixed to the edge of the vibration part 53. The arc-shaped transition region 62 extends smoothly from the edge fixing region 61 to the central boss 63. At least one jet hole 64 is provided on the central boss 63 and / or the arc-shaped transition region 62. The axis of the jet hole 64 is parallel to the axis of the displacement amplifier 6. The axis of the air outlet 8 is coaxial with the axis of the jet hole 64.

[0064] Specifically, the air inlet 7 is located on the top surface of the upper shell 1, and the air outlet 8 is located on the bottom surface of the base 2. The number of air outlets 8 and jet holes 64 at the central boss 63 position is five and / or the arc-shaped transition area 62 is also provided with jet holes 64. The bottom shell 22 is provided below the base 2, and a spiral channel 23 is provided inside the bottom shell 22, which is connected to the air outlet 8. The spiral channel 23 can rectify the exhaust airflow, making the pulse airflow smoother, and may also generate a certain swirling effect, enhancing the fluid transport capacity or heat dissipation effect.

[0065] Figures 9 to 14 A valve-equipped fluid drive device is provided.

[0066] Example 7: A piezoelectric fluid drive device is provided, comprising: a housing assembly having at least one air inlet 7 and at least one air outlet 8; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet 4, an elastomer 5, and a displacement amplifier 6 stacked sequentially along the axial direction; an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; and at least one valve assembly 9 disposed on the central boss 63 of the displacement amplifier 6.

[0067] The elastomer 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 includes an edge fixing area 61, an arc-shaped transition area 62, and a central boss 63. The edge fixing area 61 is fixed to the edge of the vibrating part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. The central boss 63 is provided with at least one air jet hole 64; the vibrating part 53 is provided with an air suction hole 54; the valve assembly 9 includes a valve plate 91, a gasket 92, and a protective cover 93. The valve plate 91, the gasket 92, and the protective cover 93 are stacked sequentially along the axial direction.

[0068] The valve plate 91 is fixed to the central boss 63. The valve plate 91 is provided with a first through hole 94, and the protective cover 93 is provided with a second through hole 95. The projection of the first through hole 94 does not coincide with the projection of the jet hole 64, while the projection of the second through hole 95 coincides with the projection of the jet hole 64.

[0069] Specifically, the projection of the first through hole 94 does not coincide with the projection of the jet hole 64 (i.e., they are offset), while the projection of the second through hole 95 coincides with the projection of the jet hole 64. The gasket 92 is placed between the two to provide a suitable gap, ensuring that the valve plate 91 has room to deform under a certain pressure.

[0070] The displacement amplifier 6 has a cymbal-shaped structure.

[0071] The housing assembly includes an upper shell 1 and a base 2, which are fastened together to form a cavity to accommodate the resonator and valve assembly 9.

[0072] The air inlet 7 is located on the top surface of the upper shell 1, and the air outlet 8 is located on the bottom surface of the base 2.

[0073] During the compression stroke (when the central boss 63 moves downward), the pressure inside the pump chamber increases, and the high-pressure fluid acts on the valve plate 91, causing it to press tightly against the protective cover 93. Because the first through hole 94 and the jet hole 64 are misaligned, the high-pressure fluid cannot pass directly through the valve plate 91. Instead, it forces the valve plate 91 to undergo elastic deformation (such as bending). The fluid can only flow through the gap between the edge of the valve plate 91 and the protective cover 93, and finally exits at high speed through the second through hole 95 and the jet hole 64 (on the central boss 63) that are aligned with it. At this time, the valve plate 91 acts as a barrier to close the reverse passage. During the expansion stroke (when the central boss 63 moves upward), the pressure inside the pump chamber... As the pressure decreases, the external fluid pressure (from the inlet 7) causes the valve plate 91 to adhere to the surface of the central boss 63, sealing the jet hole 64 and preventing fluid from flowing back into the pump chamber from the outlet 8. At the same time, due to the negative pressure formed inside the pump chamber, the external fluid can enter from the inlet 7, pushing open the suction hole 54 on the vibrating part 53 (or the corresponding valve plate if a suction hole valve is provided) to enter the pump chamber and complete the suction process. Through this design, the valve assembly 9 allows the fluid to flow almost unidirectionally from the inlet 7 to the outlet 8, significantly improving the output pressure capacity and flow stability of the device, making it a true piezoelectric pump.

[0074] Example 8: A piezoelectric fluid drive device is provided, comprising: a housing assembly having at least one air inlet 7 and at least one air outlet 8; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet 4, an elastomer 5, and a displacement amplifier 6 stacked sequentially along the axial direction; an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; and at least one valve assembly 9 disposed on the central boss 63 of the displacement amplifier 6.

[0075] The elastomer 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 includes an edge fixing area 61, an arc-shaped transition area 62, and a central boss 63. The edge fixing area 61 is fixed to the edge of the vibrating part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. The central boss 63 is provided with at least one air jet hole 64; the vibrating part 53 is provided with an air suction hole 54; the valve assembly 9 includes a valve plate 91, a gasket 92, and a protective cover 93. The valve plate 91, the gasket 92, and the protective cover 93 are stacked sequentially along the axial direction.

[0076] The valve plate 91 is fixed to the central boss 63. The valve plate 91 is provided with a first through hole 94, and the protective cover 93 is provided with a second through hole 95. The projection of the first through hole 94 does not coincide with the projection of the jet hole 64, while the projection of the second through hole 95 coincides with the projection of the jet hole 64.

[0077] The displacement amplifier 6 has a cymbal-shaped structure.

[0078] The housing assembly includes an upper shell 1 and a base 2, which are fastened together to form a cavity to accommodate the resonator and valve assembly 9.

[0079] Both the air inlet 7 and the air outlet 8 are located on both sides of the base 2. The air inlet 7 is connected to the space between the upper shell 1 and the resonator, and the air outlet 8 is connected to the space between the base 2 and the resonator.

[0080] Example 9: A piezoelectric fluid drive device is provided, comprising: a housing assembly having at least one air inlet 7 and at least one air outlet 8; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet 4, an elastomer 5, and a displacement amplifier 6 stacked sequentially along the axial direction; an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; and at least one valve assembly 9 disposed on the central boss 63 of the displacement amplifier 6.

[0081] The elastomer 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 includes an edge fixing area 61, an arc-shaped transition area 62, and a central boss 63. The edge fixing area 61 is fixed to the edge of the vibrating part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. The central boss 63 is provided with at least one air jet hole 64; the vibrating part 53 is provided with an air suction hole 54; the valve assembly 9 includes a valve plate 91, a gasket 92, and a protective cover 93. The valve plate 91, the gasket 92, and the protective cover 93 are stacked sequentially along the axial direction.

[0082] The valve plate 91 is fixed to the central boss 63. The valve plate 91 is provided with a first through hole 94, and the protective cover 93 is provided with a second through hole 95. The projection of the first through hole 94 does not coincide with the projection of the jet hole 64, while the projection of the second through hole 95 coincides with the projection of the jet hole 64.

[0083] The displacement amplifier 6 has a cymbal-shaped structure.

[0084] The housing assembly includes an upper shell 1 and a base 2, which are fastened together to form a cavity to accommodate the resonator and valve assembly 9.

[0085] The air inlet 7 is located on the top surface of the upper shell 1, and the air outlet 8 is located on the bottom surface of the base 2; and two valve assemblies 9 are provided on the central boss 63, one valve assembly 9 is located between the central boss 63 and the vibrating part, and the other valve assembly 9 is located between the central boss 63 and the base 2, and the piezoelectric ceramic sheet 4 is provided with an opening 41 corresponding to the air inlet 7.

[0086] The two valve assemblies 9 enable bidirectional sealing, further improving pump efficiency. Two valve assemblies 9 are mounted on the central boss 63. The first valve assembly 9 is located between the central boss 63 and the vibrating part 53 (i.e., the "inner side" of the pump chamber), controlling the unidirectional entry of fluid into the pump chamber through the suction port 54 on the vibrating part 53. The second valve assembly 9 is located between the central boss 63 and the base 2 (i.e., the "outer side" of the pump chamber), controlling the unidirectional discharge of fluid from the pump chamber to the outlet 8. This "dual-valve" configuration ensures that both the suction and exhaust processes are controlled by valves, more effectively preventing fluid backflow and internal crosstalk, maintaining high volumetric efficiency under both high and low loads. To accommodate the suction path, the piezoelectric ceramic plate 4 can be provided with an opening 41 corresponding to the inlet 7, providing a channel for fluid to enter the upper chamber and reach the suction valve. The base 2 also has a clearance groove, providing sufficient vibration space for the central boss 63 assembly with valve assemblies 9.

[0087] Example 10: A piezoelectric fluid drive device is provided, comprising: a housing assembly having at least one air inlet 7 and at least one air outlet 8; a resonator disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet 4, an elastomer 5, and a displacement amplifier 6 stacked sequentially along the axial direction; an electrical connector 3 electrically connected to the piezoelectric ceramic sheet 4; and at least one valve assembly 9 disposed on the central boss 63 of the displacement amplifier 6.

[0088] The elastomer 5 includes a fixing part 51, a vibrating part 53, and a spring wire structure 52 connecting the fixing part 51 and the vibrating part 53; the displacement amplifier 6 includes an edge fixing area 61, an arc-shaped transition area 62, and a central boss 63. The edge fixing area 61 is fixed to the edge of the vibrating part 53. The arc-shaped transition area 62 extends smoothly from the edge fixing area 61 to the central boss 63. The central boss 63 is provided with at least one air jet hole 64; the vibrating part 53 is provided with an air suction hole 54; the valve assembly 9 includes a valve plate 91, a gasket 92, and a protective cover 93. The valve plate 91, the gasket 92, and the protective cover 93 are stacked sequentially along the axial direction.

[0089] The valve plate 91 is fixed to the central boss 63. The valve plate 91 is provided with a first through hole 94, and the protective cover 93 is provided with a second through hole 95. The projection of the first through hole 94 does not coincide with the projection of the jet hole 64, while the projection of the second through hole 95 coincides with the projection of the jet hole 64.

[0090] The displacement amplifier 6 has a cymbal-shaped structure.

[0091] The housing assembly includes an upper shell 1 and a base 2, which are fastened together to form a cavity to accommodate the resonator and valve assembly 9.

[0092] Both the air inlet 7 and the air outlet 8 are located on both sides of the base 2. The air inlet 7 is connected to the space between the upper shell 1 and the resonator, and the air outlet 8 is connected to the space between the base 2 and the resonator. Two valve assemblies 9 are provided on the central boss 63. One valve assembly 9 is located between the central boss 63 and the vibrating part, and the other valve assembly 9 is located between the central boss 63 and the base 2. The piezoelectric ceramic sheet 4 is provided with an opening 41 corresponding to the air inlet 7.

[0093] The base 2 is provided with a clearance groove to provide space for the deformation of the central boss 63.

[0094] In summary: By setting an elastic body 5 including a fixed part 51, a vibrating part 53 and a spring wire structure 52, a low-stiffness flexible connection between the vibrating part 53 and the fixed part 51 is achieved, which significantly reduces the overall resonant frequency of the resonator, making it suitable for low-frequency high-efficiency driving. At the same time, it reduces the vibration energy transmitted to the housing, improving efficiency and quietness. By setting up a cymbal-shaped displacement amplifier 6 that includes an edge fixing area 61, an arc-shaped transition area 62 and a central boss 63, the small deformation of the piezoelectric ceramic sheet 4 is efficiently amplified into a large axial displacement of the central boss 63, thereby increasing the fluid volume in a single cycle. In addition, its smooth arc-shaped structure also achieves uniform stress distribution, effectively avoiding stress concentration at the connection points. By setting the axis of the air outlet 8 to be coaxial with the axis of the jet hole 64, the outflow airflow and the jet direction are precisely aligned, which minimizes the impact and vortex loss in the flow channel and improves the aerodynamic transmission efficiency. By setting the valve assembly 9 and offsetting the first through hole 94 on its valve plate 91 from the jet hole 64, and aligning the second through hole 95 on the protective cover 93 with the jet hole 64, efficient unidirectional flow control of fluid from the inlet 7 to the outlet 8 is achieved, enabling the device to function as a pump, output a stable flow rate, and provide adaptability. By setting up various layouts of air inlets 7 and outlets 8, as well as multiple jet holes 64 and spiral channels 23, applicability is provided to meet the diverse needs of different installation spaces and application scenarios (such as centralized jetting and uniform air delivery).

[0095] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0096] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0097] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A piezoelectric fluid drive device, characterized in that, include: A housing assembly having at least one air inlet (7) and at least one air outlet (8). A resonator, disposed within the housing assembly, comprises a piezoelectric ceramic sheet (4), an elastomer (5), and a displacement amplifier (6) stacked sequentially along the axial direction; and Electrical connector (3), which is electrically connected to the piezoelectric ceramic sheet (4); The elastic body (5) includes a fixing part (51), a vibrating part (53), and a spring wire structure (52) connecting the fixing part (51) and the vibrating part (53). The displacement amplifier (6) includes an edge fixing area (61), an arc transition area (62), and a central boss (63). The edge fixing area (61) is fixed to the edge of the vibration part (53). The arc transition area (62) extends smoothly from the edge fixing area (61) to the central boss (63). At least one air jet hole (64) is provided on the central boss (63) and / or the arc transition area (62). The axis of the air jet hole (64) is parallel to the axis of the displacement amplifier (6). The axis of the air outlet (8) is coaxial with the axis of the jet hole (64).

2. The piezoelectric fluid drive device as described in claim 1, characterized in that, The housing assembly includes an upper shell (1) and a base (2), wherein the base (2) and the upper shell (1) are fastened together to form a cavity to accommodate the resonator.

3. The piezoelectric fluid drive device as described in claim 2, characterized in that, The air inlet (7) is located on the side of the base (2), and the air outlet (8) is located on the bottom surface of the base (2); The air inlet (7) is located on the top surface of the upper shell (1), and the air outlet (8) is located on the bottom surface of the base (2); Both the air inlet (7) and the air outlet (8) are located on the bottom surface of the base (2); The air inlet (7) is located on the top surface of the upper shell (1), the air outlet (8) is located on the bottom surface of the base (2), and a nozzle (21) is provided at the position of the air outlet (8). The number of the air outlet (8) and the air jet hole (64) is three. The air inlet (7) is located on the top surface of the upper shell (1), the air outlet (8) is located on the bottom surface of the base (2), and the number of the air outlet (8) and the jet hole (64) is five; The air inlet (7) is located on the top surface of the upper shell (1), and the air outlet (8) is located on the bottom surface of the base (2). The number of the air outlet (8) and the jet hole (64) is five. A bottom shell (22) is provided below the base (2). A spiral channel (23) is provided inside the bottom shell (22) and communicates with the air outlet (8).

4. The piezoelectric fluid drive device as described in claim 3, characterized in that, The displacement amplifier (6) has a cymbal-shaped structure.

5. The piezoelectric fluid drive device as described in claim 4, characterized in that, The base (2) is provided with a clearance groove for providing space for the deformation of the central boss (63).

6. A piezoelectric fluid drive device, characterized in that, include: A housing assembly having at least one air inlet (7) and at least one air outlet (8). A resonator is disposed within the housing assembly, the resonator comprising a piezoelectric ceramic sheet (4), an elastomer (5), and a displacement amplifier (6) stacked sequentially along the axial direction. Electrical connector (3), which is electrically connected to the piezoelectric ceramic sheet (4); as well as At least one valve assembly (9) is disposed on the central boss (63) of the displacement amplifier (6); The elastic body (5) includes a fixing part (51), a vibrating part (53), and a spring wire structure (52) connecting the fixing part (51) and the vibrating part (53). The displacement amplifier (6) includes an edge fixing area (61), an arc transition area (62) and a central boss (63). The edge fixing area (61) is fixed to the edge of the vibration part (53). The arc transition area (62) extends smoothly from the edge fixing area (61) to the central boss (63). The central boss (63) is provided with at least one jet hole (64). The vibrating part (53) is provided with an air intake hole (54); The valve assembly (9) includes a valve plate (91), a gasket (92), and a protective cover (93), which are stacked sequentially along the axial direction. The valve plate (91) is fixed to the central boss (63). The valve plate (91) is provided with a first through hole (94), and the protective cover (93) is provided with a second through hole (95). The projection of the first through hole (94) does not coincide with the projection of the jet hole (64), while the projection of the second through hole (95) coincides with the projection of the jet hole (64).

7. The piezoelectric fluid drive device as described in claim 6, characterized in that, The displacement amplifier (6) has a cymbal-shaped structure.

8. The piezoelectric fluid drive device as described in claim 7, characterized in that, The housing assembly includes an upper shell (1) and a base (2), wherein the base (2) and the upper shell (1) are fastened together to form a chamber to accommodate the resonator and the valve assembly (9).

9. The piezoelectric fluid drive device as described in claim 8, characterized in that, The air inlet (7) is located on the top surface of the upper shell (1), and the air outlet (8) is located on the bottom surface of the base (2); The air inlet (7) and the air outlet (8) are both located on both sides of the base (2), wherein the air inlet (7) is connected to the space between the upper shell (1) and the resonator, and the air outlet (8) is connected to the space between the base (2) and the resonator. The air inlet (7) is located on the top surface of the upper shell (1), and the air outlet (8) is located on the bottom surface of the base (2); and two valve assemblies (9) are provided on the central boss (63), one valve assembly (9) is located between the central boss (63) and the vibrating part, and the other valve assembly (9) is located between the central boss (63) and the base (2); and the piezoelectric ceramic sheet (4) is provided with an opening (41) corresponding to the air inlet (7). The air inlet (7) and the air outlet (8) are both located on both sides of the base (2). The air inlet (7) is connected to the space between the upper shell (1) and the resonator, and the air outlet (8) is connected to the space between the base (2) and the resonator. Two valve assemblies (9) are provided on the central boss (63). One valve assembly (9) is located between the central boss (63) and the vibrating part, and the other valve assembly (9) is located between the central boss (63) and the base (2). The piezoelectric ceramic sheet (4) is provided with an opening (41) corresponding to the air inlet (7).

10. The piezoelectric fluid drive device as described in claim 9, characterized in that, The base (2) is provided with a clearance groove for providing space for the deformation of the central boss (63).

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