ACTUATOR
An actuator includes a suspension plate, an outer frame, one or more supporting elements, a piezoelectric sheet, an inlet plate, and a resonance sheet. The suspension plate, the outer frame, the supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated as a modular structure, and the modular structure has a length, a width, and a height.
This non-provisional application claims priority under 35 U.S.C. § 119(a) to Patent Application No. 110121456 filed in Taiwan, R.O.C. on Jun. 11, 2021, the entire contents of which are hereby incorporated by reference.
BACKGROUND Technical FieldThe present disclosure relates to an actuator, in particular, to an actuator which is miniaturized, thin, and quiet.
Related ArtWith the advancement of science and technology, products used in many sectors such as pharmaceutical industries, computer techniques, printing industries, or energy industries are all developed toward elaboration and miniaturization. The actuators are key components that are used in, for example, micro pumps, nebulizers, inkjet heads, or industrial printers. Therefore, how to break through the bottleneck in the technological development of the actuators by a novel structure is the important content of development.
For example, in medical industries, many equipment or apparatuses (such as blood pressure meters or portable or wearable equipment or apparatuses) are driven by pneumatic-power. Such apparatus usually utilizes a motor and a pneumatic valve to achieve the purpose of fluid transmission. However, owing to the bulk volume of the traditional motor and fluid valve, the entire volume of these apparatuses cannot be reduced. As a result, the object of miniaturizing these apparatuses and making them portable cannot be accomplished. Moreover, during operations of the traditional motor and fluid valve, the motor and fluid valves usually generate noise, have poor heat dissipation performances, and make the use of these apparatuses not convenient and comfortable.
Therefore, how to develop a device or an apparatus to improve and address above problem, make traditional device or apparatus driven by pneumatic-power to become smaller, to be miniaturized, to be more quiet, and to dissipate heat more quickly, thereby providing an actuator which is portable and can be used conveniently and comfortably, is an issue of concern recently.
SUMMARYOne object of the present disclosure is to provide an actuator including a piezoelectric sheet in combination with a suspension plate. Through the fluid fluctuation generated by the piezoelectric sheet under a high-frequency vibration, a pressure gradient is generated in the flow path designed in the actuator. As a result, the fluid is transmitted from the intake end to the discharge end through the difference of resistances exist between the intake end and the discharge end of the flow path, so as to overcome the problems occurring in known equipment or apparatus utilizing the pneumatic-power, such as too large in volume, hard to be miniaturized, unable to be portable, and generating loud noises during operation.
Another object of the present disclosure is to provide an actuator wherein the suspension plate, the outer frame, the supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated as a modular structure. The modular structure has a length, a width, and a height which are all of millimeter (mm) scale, micrometer (μm) scale, or nanometer (nm) scale.
To achieve the aforementioned object(s), a general embodiment of the present disclosure provides an actuator including a suspension plate, an outer frame, at least one supporting element, a piezoelectric sheet, an inlet plate, and a resonance sheet. The suspension plate has a first surface and a second surface, and the suspension plate is capable of bending and vibrating. The outer frame is disposed around an outer periphery of the suspension plate. The at least one supporting element is connected between the suspension plate and the outer frame to provide a flexible support for the suspension plate. The piezoelectric sheet is disposed above the first surface of the suspension plate. The inlet plate is disposed on the second surface of the suspension plate. The inlet plate has at least one inlet hole, at least one convergence channel, and a convergence chamber. The at least one inlet hole is configured to introduce a gas flow into the actuator, and the at least one convergence channel is corresponding to the at least one inlet hole for guiding the gas flow introduced from the at least one inlet hole to be converged into the convergence chamber formed by a central recess. The resonance sheet is disposed between the inlet plate and the suspension plate. The resonance sheet has a perforation corresponding to the convergence chamber of the inlet plate, and a movable portion is provided in the periphery of the perforation. The suspension plate, the outer frame, the at least one supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated into a modular structure, and the modular structure has a length, a width, and a height.
To achieve the aforementioned object(s), another general embodiment of the present disclosure provides an actuator including a suspension plate, an outer frame, at least one supporting element, a piezoelectric sheet, an inlet plate, and a resonance sheet. The suspension plate has a first surface and a second surface, and the suspension plate is capable of bending and vibrating. The outer frame is disposed around an outer periphery of the suspension plate. The least one supporting element is connected between the suspension plate and the outer frame to provide a flexible support for the suspension plate. The piezoelectric sheet is disposed above the first surface of the suspension plate. The inlet plate is disposed on the second surface of the suspension plate. The inlet plate has at least one inlet hole, at least one convergence channel, and a convergence chamber. The at least one inlet hole is configured to introduce a gas flow into the actuator, and the at least one convergence channel is corresponding to the at least one inlet hole for guiding the gas flow introduced from the at least one inlet hole to be converged into the convergence chamber formed by a central recess. The resonance sheet is disposed between the inlet plate and the suspension plate. The resonance sheet has a perforation corresponding to the convergence chamber of the inlet plate, and a movable portion is provided in the periphery of the perforation. The suspension plate, the outer frame, the at least one supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated into a modular structure, and the modular structure has a length in a range between 1 nm and 999 nm, a width in a range between 1 nm and 999 nm, and a height in a range between 1 nm and 999 nm.
The disclosure will become more fully understood from the detailed description given herein below, for illustration only and thus not limitative of the disclosure, wherein:
The present disclosure will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of different embodiments of this disclosure are presented herein for the purpose of illustration and description only, and it is not intended to limit the scope of the present disclosure.
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In this embodiment, the suspension plate 11 is a stepped structure. That is, in this embodiment, the second surface 11b of the suspension plate 11 further has a protruding portion 11a. The protruding portion 11a may be, but not limited to, a round protruding structure. The second surface 11b of the suspension plate 11 is coplanar with the second surface 12a of the outer frame 12, and the second surface 11b of the suspension plate 11 is also coplanar with the second surface 13a of the supporting element 13. Moreover, a specific depth is provided between the protruding portion 11a of the suspension plate 11 and the second surface 12a of the outer frame 12, the protruding portion 11a of the suspension plate 11 and the second surface 11b of the suspension plate 11, and the protruding portion 11a of the suspension plate 11 and the second surface 13a of the supporting element 13, respectively. The first surface 11c of the suspension plate 11, the first surface 12b of the outer frame 12, and the first surface 13b of the supporting element 13 form a flat coplanar structure, but not limited thereto.
In this embodiment, the piezoelectric sheet 14 is attached to the first surface 11c of the suspension plate 11. In some other embodiments, the configuration of the suspension plate 11 may be a square plate structure with double flat surfaces, but not limited thereto, and the configuration of the suspension plate 11 may be varied according to practical conditions. In some embodiments, the suspension plate 11, the supporting element 13, and the outer frame 12 may be an integrally-formed structure and may be made from a metal plate, for example, but not limited to, a stainless steel plate. In some other embodiments, the side length of piezoelectric sheet 14 is shorter than the side length of the suspension plate 11. In further embodiments, the side length of piezoelectric sheet 14 is equal to the side length of the suspension plate 11, and the piezoelectric sheet 14 is configured as a square plate structure corresponding to the suspension plate 11, but not limited thereto. It is noted that, in this embodiment, the piezoelectric sheet 14 may also have two electrodes formed by silver-palladium alloy doped with graphene materials. The electrodes are provided for reducing the resistance to increase the mobility of charge and increasing the thermal conductivity to dissipate heat quickly. The surface of one of the electrodes is coated with a coating of the thermal conduction layer, which also can increase the thermal conductivity to dissipate heat quickly. The surface of the other electrode is coated with an adhesive layer made of epoxy resin doped with conductive materials, so that the electrode can be adhered to the first surface 11c of the suspension plate 11 through the adhesive layer for reducing the resistance to increase the charge mobility and increasing the thermal conductivity to dissipate heat quickly. The two electrodes are applied with a voltage to drive the suspension plate 11 to vibrate and bent, but not limited thereto. The configuration of the electrodes of the piezoelectric sheet 14 may be varied according to practical requirements.
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According to one or some embodiments of the present disclosure, through the fluid fluctuation generated by the piezoelectric sheet under a high-frequency vibration, a pressure gradient is generated in the flow path designed in the actuator, so as to allow the fluid to flow rapidly. As a result, the fluid is transmitted from the intake end to the discharge end continuously through the difference of the resistances exist between the intake end and the discharge end of the flow path, so as to allow the fluid to flow rapidly and transmit continuously, thereby the fluid can be transmitted rapidly and quietly. Moreover, the entire volume of the actuator can be reduced, so that the actuator can be miniaturized even to millimeter scale, micrometer scale, or nanometer scale. Furthermore, the present invention can achieve great heat dissipation performance through coating a doped coating material on the surface of the inlet plate and the electrodes of the piezoelectric sheet.
The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure.
Claims
1. An actuator comprising:
- a suspension plate having a first surface and a second surface, wherein the suspension plate is capable of bending and vibrating;
- an outer frame disposed around an outer periphery of the suspension plate;
- at least one supporting element connected between the suspension plate and the outer frame to provide a flexible support for the suspension plate;
- a piezoelectric sheet disposed above the first surface of the suspension plate;
- an inlet plate disposed on the second surface of the suspension plate, wherein the inlet plate has at least one inlet hole, at least one convergence channel, and a convergence chamber; the at least one inlet hole is configured to introduce a gas flow into the actuator, and the at least one convergence channel is corresponding to the at least one inlet hole for guiding the gas flow introduced from the at least one inlet hole to be converged into the convergence chamber; and
- a resonance sheet disposed between the inlet plate and the suspension plate, wherein the resonance sheet has a perforation corresponding to the convergence chamber of the inlet plate, and a movable portion is provided in a periphery of the perforation;
- wherein the suspension plate, the outer frame, the at least one supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated as a modular structure, and the modular structure has a length, a width, and a height.
2. The actuator according to claim 1, wherein a first chamber is provided between the resonance sheet, the suspension plate, the at least one supporting element, and the outer frame, so that the piezoelectric sheet is driven and bent in the first chamber; when the suspension plate vibrates, the gas flow is introduced into the actuator from the at least one inlet hole of the inlet plate, converged into the convergence chamber through the at least one convergence channel, flows through the perforation of the resonance sheet and enters the first chamber, thereby the suspension plate and the movable portion of the resonance sheet generates resonance effect for transmitting the gas flow.
3. The actuator according to claim 1, wherein the modular structure has the length in a range between 1 mm and 999 mm, the width in a range between 1 mm and 999 mm, and the height in a range between 1 mm and 999 mm.
4. The actuator according to claim 1, wherein the modular structure has the length in a range between 1 μm and 999 μm, the width in a range between 1 μm and 999 μm, and the height in a range between 1 μm and 999 μm.
5. The actuator according to claim 1, wherein the modular structure has the length in a range between 1 nm and 999 nm, the width in a range between 1 nm and 999 nm, and the height in a range between 1 nm and 999 nm.
6. The actuator according to claim 1, wherein the suspension plate is square-shaped and has a protruding portion.
7. The actuator according to claim 1, wherein the actuator further comprises a conductive sheet, a first insulation sheet, and a second insulation sheet, and wherein the inlet plate, the resonance sheet, the outer frame, the first insulation sheet, the conductive sheet, and the second insulation sheet are sequentially stacked and assembled.
8. An actuator comprising:
- a suspension plate having a first surface and a second surface, wherein the suspension plate is capable of bending and vibrating;
- an outer frame disposed around an outer periphery of the suspension plate;
- at least one supporting element connected between the suspension plate and the outer frame to provide a flexible support for the suspension plate;
- a piezoelectric sheet disposed above the first surface of the suspension plate;
- an inlet plate disposed on the second surface of the suspension plate, wherein the inlet plate has at least one inlet hole, at least one convergence channel, and a convergence chamber; the at least one inlet hole is configured to introduce a gas flow into the actuator, and the at least one convergence channel is corresponding to the at least one inlet hole for guiding the gas flow introduced from the at least one inlet hole to be converged into the convergence chamber; and
- a resonance sheet disposed between the inlet plate and the suspension plate, wherein the resonance sheet has a perforation corresponding to the convergence chamber of the inlet plate, and a movable portion is provided in a periphery of the perforation;
- wherein the suspension plate, the outer frame, the at least one supporting element, the piezoelectric sheet, the inlet plate, and the resonance sheet are fabricated as a modular structure, and the modular structure has a length in a range between 1 nm and 999 nm, a width in a range between 1 nm and 999 nm, and a height in a range between 1 nm and 999 nm.
Type: Application
Filed: May 24, 2022
Publication Date: Dec 15, 2022
Inventors: Hao-Jan Mou (Hsinchu City), Yung-Lung Han (Hsinchu City), Chi-Feng Huang (Hsinchu City), Chang-Yen Tsai (Hsinchu City), Chin-Wen Hsieh (Hsinchu City)
Application Number: 17/751,882