Ejector piezoelectric fan with flexible array of piezoelectric ceramic low noise diaphragms

Abstract

The application discloses a jet piezoelectric fan of a flexible point array piezoelectric ceramic low-noise vibrating diaphragm, which comprises a structural frame, an air outlet penetrating through one side of the structural frame, two air boxes A arranged in a symmetrical structure on two sides of the structural frame, two air boxes A and the structural frame forming an air box B, a side wall of the air box A away from the air box B being vibrated based on a piezoelectric ceramic sheet, a compression hole being formed on a side wall of the air box A close to the air box B, the volume of a single air box A being greater than the volume of the air box B, and the phase difference of driving power sources of piezoelectric ceramic sheets of the two air boxes A being 0. The high-performance piezoelectric jet fan provided by the application has very wide practical scenarios, can be mass-produced, and has higher economic benefits and social effects.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric fans, and more particularly to a jet piezoelectric fan with a flexible dot array piezoelectric ceramic low-noise vibration diaphragm. Background Art

[0002] Jet piezoelectric fans are primarily designed to exploit the inverse piezoelectric effect of piezoelectric ceramics. When electricity is applied to the piezoelectric ceramic, the inverse piezoelectric effect causes it to continuously expand and contract, driving the attached metal steel sheet to expand and contract continuously, amplifying the expansion. By gluing two expanding and contracting vibrating plates together, leaving a cavity in between, the metal vibrating membranes on either side of the cavity continuously expand and contract, forming a bellows capable of outputting a constant airflow velocity. This bellows is known as a piezoelectric jet fan.

[0003] The piezoelectric jet fan mainly consists of two parts: the jet piezoelectric fan and the driving power supply.

[0004] The current piezoelectric jet fans are divided into two types according to the vibration frequency:

[0005] One is the ultrasonic piezoelectric jet fan, which has a vibration frequency of more than 15KHz. The main consideration is the noise level that the human body can hear. Most people cannot hear a vibration frequency greater than 15KHz, but it currently has disadvantages such as complex processing technology and large production line investment.

[0006] The second type is a low-frequency piezoelectric jet fan, which has a vibration frequency below 15 kHz and is audible to the human body. Low-frequency piezoelectric jet fans typically have a frequency between tens of hertz and 1 kHz. The noise perceived by the human ear increases in pitch and becomes more piercing as the frequency rises. As the frequency of a low-frequency piezoelectric jet fan increases, the fan's wind speed also increases. This raises the question of how to ensure that low-frequency piezoelectric jet fans have both a high wind speed for good heat dissipation and low noise to meet the broad market demand. Summary of the Invention

[0007] The object of the present invention is to provide a jet piezoelectric fan with a flexible dot array piezoelectric ceramic low-noise vibration diaphragm, in order to solve the technical problems in the background technology.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] The jet piezoelectric fan with flexible dot array piezoelectric ceramic low noise vibration diaphragm includes:

[0010] a structural frame, an air outlet penetrating one side of the structural frame;

[0011] Bellows A, two bellows A are arranged on both sides of the structural frame in a symmetrical structure; the two bellows A and the structural frame form a bellows B; the side wall of the bellows A away from the bellows B realizes vibration based on the piezoelectric ceramic piece; a compression hole is opened on the side wall of the bellows A close to the bellows B; the volume of a single bellows A is larger than the volume of the bellows B; and the phase difference of the driving power supply of the piezoelectric ceramic pieces of the bellows A on both sides is 0.

[0012] In some embodiments, the bellows A includes: a vibrating metal diaphragm, an auxiliary electrode and a partition, the vibrating metal diaphragm is provided with a pressure relief hole, and the pressure relief hole is covered with an elastic diaphragm; a plurality of piezoelectric ceramic sheets are provided on the vibrating metal diaphragm around the pressure relief hole; the auxiliary electrode is arranged on the plurality of piezoelectric ceramic sheets, and the auxiliary electrode is provided with an avoidance hole at a position corresponding to the elastic diaphragm, the negative pole of the piezoelectric ceramic sheet is connected to the vibrating metal diaphragm, and the positive pole of the piezoelectric ceramic sheet is connected to the auxiliary electrode; the compression hole is provided on the partition; the vibrating metal diaphragm, partition and structural frame constitute the bellows A.

[0013] In some embodiments, the partitions on both sides and the structural frame form a bellows B.

[0014] In some embodiments, the pressure relief hole is surrounded by dotted wire grooves.

[0015] In some embodiments, the elastic diaphragm is formed by filling elastic glue in the pressure relief hole and the wire groove and curing it.

[0016] In some embodiments, a plurality of piezoelectric ceramic sheets provided on the vibrating metal diaphragm around the pressure relief hole are arranged in a ring array.

[0017] In some embodiments, the piezoelectric ceramic piece has a piezoelectric constant d 33 Piezoelectric ceramics with a PC / N greater than 750, a Curie temperature greater than 210°C, and a size of 1mm×1mm.

[0018] In some embodiments, the pressure relief hole is opened at the center of the vibrating metal diaphragm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The piezoelectric fan provided by the present application has two left and right bellows A composed of flexible point array piezoelectric ceramic low-noise vibrating diaphragms. The left and right bellows A are composed of two left and right flexible, point array piezoelectric ceramics, a vibrating metal diaphragm, a structural frame and the middle compression box B wall. When the flexible point array piezoelectric ceramics and the vibrating metal diaphragm are working, they continuously reciprocate and expand and contract to form a high-speed moving airflow in the bellows A. When the airflow passes through the air outlet on the wall of the middle compression box B, the airflow is compressed again and enters the central compression box B. Since the structural space in the left and right bellows A is much larger than the middle compression box B, the gas in the box is compressed again, so the air outlet of the compression box forms a high-speed airflow far higher than the standard atmospheric pressure. It quickly exchanges heat with the hot air from the external heat source to achieve the purpose of rapid heat dissipation. The market for high-performance piezoelectric jet fans has a very wide range of practical scenarios and can be mass-produced, with high economic benefits and social effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Outline drawing of the jet piezoelectric fan of the present invention

[0022] Figure 2 It is a structural schematic diagram of the jet piezoelectric fan of the present invention.

[0023] Figure 3 It is a schematic structural diagram of the jet piezoelectric fan blower box A and the compression box of the present invention.

[0024] Figure 4 The present invention is a flexible jet piezoelectric fan, a dot array piezoelectric ceramic, and a low-noise vibration diaphragm diagram. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0028] In the description of the application, it is necessary to understand that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0029] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units need not be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0030] The following will be combined with Figures 1-4 The jet piezoelectric fan of the flexible point array piezoelectric ceramic low-noise vibrating diaphragm will be described in detail. It is worth noting that the following embodiments are only used to explain the application and do not constitute a limitation on the application.

[0031] Embodiment 1:

[0032] Referring to Figures 1-4 As shown in the figure, the jet piezoelectric fan of the flexible point array piezoelectric ceramic low-noise vibrating diaphragm comprises:

[0033] The structural frame 4 is a wind box A, and the air outlet 8 penetrates one side of the structural frame; two wind boxes A are arranged symmetrically on both sides of the structural frame; two wind boxes A and the structural frame form a wind box B; the side wall of the wind box A away from the wind box B is vibrated based on the piezoelectric ceramic sheet; the side wall of the wind box A close to the wind box B is provided with a compression hole 7; the volume of a single wind box A is greater than that of the wind box B; and the phase difference of the driving power supply of the piezoelectric ceramic sheets of the two wind boxes A is 0.

[0034] The bellows A includes: a vibrating metal diaphragm 2, an auxiliary electrode 9 and a partition 5. The vibrating metal diaphragm is provided with a pressure relief hole 10, and the pressure relief hole is covered with an elastic diaphragm 3; a plurality of piezoelectric ceramic sheets are provided on the vibrating metal diaphragm around the pressure relief hole; the auxiliary electrode is arranged on the plurality of piezoelectric ceramic sheets, and the auxiliary electrode is provided with an avoidance hole at a position corresponding to the elastic diaphragm, the negative pole of the piezoelectric ceramic sheet is connected to the vibrating metal diaphragm, and the positive pole of the piezoelectric ceramic sheet is connected to the auxiliary electrode; the compression hole is provided on the partition; the vibrating metal diaphragm, the partition and the structural frame constitute the bellows A.

[0035] The left and right bellows A are composed of two flexible point array piezoelectric ceramic sheets 1, a structural frame 4, and a compression box B. The flexible point array piezoelectric ceramic sheet is composed of two parts, one of which is a vibrating metal diaphragm 2, which is made of metal material with good elasticity. In order to increase the deformation of the center of the material, a special design is made on the middle structure of the vibrating metal diaphragm. A pressure relief hole is opened in the center, and a dot-shaped wire groove 11 is designed around the hole to increase the softness of the metal material. Glue with good elasticity is filled in the pressure relief hole and the wire groove, and the pressure relief hole and the wire groove are sealed with elastic glue to prevent air leakage. A composite flexible material of the vibrating metal diaphragm and glue is formed in the center of the vibrating metal diaphragm, which makes the hard metal material soft and increases the deformation; the glue can be organic silicone. The thickness of the elastic diaphragm formed by the glue is the same as the thickness of the vibrating metal diaphragm. The elastic diaphragm is formed by curing the glue in the pressure relief hole and the wire groove. A pressure relief hole is opened in the center of the vibrating metal diaphragm, and dot-shaped wire grooves are designed around the hole. This not only increases the deformation of the vibrating metal diaphragm, but also facilitates the adhesion of glue, making it easier to form a more solid elastic diaphragm with the vibrating metal diaphragm.

[0036] Second, a number of high-performance piezoelectric ceramics are attached to the vibrating metal diaphragm in an array of tiny points, and auxiliary electrodes are used to connect the piezoelectric ceramic electrodes at each point in the array. The array of high-performance tiny piezoelectric ceramics 1 is glued to the vibrating metal diaphragm with glue, and the tiny piezoelectric ceramics are connected using auxiliary electrodes. The negative electrode of the piezoelectric ceramic is connected to the vibrating metal diaphragm, and the positive electrode of the piezoelectric ceramic is connected to the auxiliary electrode. This ensures that each tiny piezoelectric ceramic in the array can be powered, ensuring the performance of the piezoelectric fan.

[0037] Several piezoelectric ceramic plates are arranged in a ring array on the vibrating metal diaphragm surrounding the pressure relief hole. This not only ensures large deformation of the vibrating diaphragm and outputs a large amount of air, but also reduces vibration and noise.

[0038] The compression box B has two left and right partitions, each with a compression hole. When the gas in the left and right bellows A passes through the compression hole of the compression box B, due to the volume difference in the structure, the dense gas evacuated in the bellows passes through the compression hole, the density of the gas is increased, the wind pressure intensity is enhanced, and a high-speed airflow is formed at the air outlet of the compression box. The left and right partitions of the compression box B are respectively connected to the inner wall of the structural frame to form a relatively closed compression box B with a compression hole 7, and an air outlet is opened at the front end of the box.

[0039] The piezoelectric constant of the dot array piezoelectric ceramic piece is d 33 High-performance piezoelectric ceramics with a PC / N ratio greater than 750, a Curie temperature greater than 210°C, and ceramic particles measuring 1mm x 1mm. The current driving the piezoelectric ceramic discs is a sinusoidal drive. The drive power supply utilizes both self-excited oscillation (current drive) and separately excited square wave oscillation (voltage drive) to meet diverse user needs. Self-excited current drive connects two groups of piezoelectric ceramic discs in series; separately excited voltage drive connects two groups of piezoelectric ceramic discs in parallel.

[0040] Dot array piezoelectric ceramics consist of tiny (1mm x 1mm) dot-shaped particles arranged in an array on a metal vibrating plate. This design increases wind speed, reduces vibration, and minimizes noise. The metal vibrating plate is designed to be flexible, with a central pressure relief hole and dotted wire slots surrounding the hole. This enhances the plate's flexibility, increases its elasticity, increases wind speed, and reduces noise. Elastic glue prevents air leakage from the pressure relief hole and dotted wire slots, maintaining the plate's flexibility.

[0041] The structural frame in the middle is the skeleton of the entire piezoelectric jet fan. It supports the air boxes A on the left and right sides, supports the middle compression box B, and is also the outlet of the piezoelectric jet fan.

[0042] The jet piezoelectric fan is constructed by bonding multiple piezoelectric ceramic sheets to a metal vibrating steel plate in a dot array arrangement, which modulates the vibration mode of the piezoelectric ceramic sheets. This ensures that the piezoelectric ceramic sheets can output high energy while also reducing frequency and noise, improving the performance of the jet piezoelectric fan.

[0043] The above description is only a preferred embodiment of the present invention and is used to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Flexible dot array piezoelectric ceramic low noise vibration diaphragm jet piezoelectric fan, characterized by: include: a structural frame, an air outlet penetrating one side of the structural frame; Bellows A, two of which are symmetrically arranged on both sides of the structural frame; the two bellows A and the structural frame form bellows B; a side wall of bellows A away from bellows B vibrates based on a piezoelectric ceramic sheet; a compression hole is opened on a side wall of bellows A close to bellows B; The volume of a single bellows A is larger than that of bellows B; and the phase difference between the driving power supplies of the piezoelectric ceramic plates of the bellows A on both sides is 0; The bellows A comprises: a vibrating metal diaphragm, an auxiliary electrode, and a diaphragm. The vibrating metal diaphragm is provided with a pressure relief hole, which is covered with an elastic diaphragm. A plurality of piezoelectric ceramic sheets are provided on the vibrating metal diaphragm around the pressure relief hole. The auxiliary electrode is provided on the plurality of piezoelectric ceramic sheets, and a avoidance hole is provided on the auxiliary electrode at a position corresponding to the elastic diaphragm. The negative electrode of the piezoelectric ceramic sheet is connected to the vibrating metal diaphragm, and the positive electrode of the piezoelectric ceramic sheet is connected to the auxiliary electrode. The compression hole is provided on the diaphragm. The vibrating metal diaphragm, diaphragm, and structural frame constitute the bellows A. The pressure relief hole is surrounded by dotted wire grooves; A plurality of piezoelectric ceramic sheets are arranged in a ring array on the vibrating metal diaphragm around the pressure relief hole; The elastic diaphragm is formed by filling elastic glue in the pressure relief hole and the wire groove and solidifying it.

2. The jet piezoelectric fan with flexible dot array piezoelectric ceramic low noise vibration diaphragm according to claim 1 is characterized in that: The partitions on both sides and the structural frame form a bellows B.

3. The jet piezoelectric fan with flexible dot array piezoelectric ceramic low noise vibration diaphragm according to claim 1, characterized in that: The piezoelectric ceramic piece has a piezoelectric constant d 33 Piezoelectric ceramics with a PC / N greater than 750, a Curie temperature greater than 210°C, and a size of 1mm×1mm.

4. The jet piezoelectric fan with flexible dot array piezoelectric ceramic low noise vibration diaphragm according to claim 1, characterized in that: The pressure relief hole is opened at the center of the vibrating metal diaphragm.

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