AU2021104830A4 - A micro piezoelectric axial flow fan - Google Patents
A micro piezoelectric axial flow fan Download PDFInfo
- Publication number
- AU2021104830A4 AU2021104830A4 AU2021104830A AU2021104830A AU2021104830A4 AU 2021104830 A4 AU2021104830 A4 AU 2021104830A4 AU 2021104830 A AU2021104830 A AU 2021104830A AU 2021104830 A AU2021104830 A AU 2021104830A AU 2021104830 A4 AU2021104830 A4 AU 2021104830A4
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- Australia
- Prior art keywords
- piezoelectric vibrator
- flow hole
- cavity
- piezoelectric
- hole
- Prior art date
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Links
- 238000009434 installation Methods 0.000 claims abstract description 6
- 241000237519 Bivalvia Species 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 235000020639 clam Nutrition 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 7
- 230000007423 decrease Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Reciprocating Pumps (AREA)
Abstract
A micro piezoelectric axial flow fan has a piezoelectric vibrator (1) and a
base (2). The base (2), a rectangular block with a smaller thickness, has a
piezoelectric vibrator mounting slot (21) arranged on the top surface of
the rectangular block, which can install the piezoelectric vibrator (1); The
piezoelectric vibrator mounting slot (21) has a cavity slot (22) in the
centre of the bottom which can form a sealed cavity (3) with the
piezoelectric vibrator (1) after installation; The cavity slot (22)has a flow
hole (23) at the centre position of the bottom which can connect the
cavity (3) to the external air; The base (2) has the first rectangular hole
(24) and the second rectangular hole (25) in two vertical directions on the
side. The two rectangular holes are interconnected and connected with the
flow hole (23). In this way, the flow hole (23) is divided into two parts:
internal flow hole (231) and external flow hole (232). When working, the
piezoelectric vibrator (1) occurs reciprocating bending vibration, the
volume of the cavity (3) increases and decreases, the fluid flows in and
out through the flow hole (23), and the gas is inhaled from the rectangular
hole (24) (25) and discharged from the external flow hole (232). It has the
characteristics of small volume and simple structure.
11
2
24 232 231
23
Description
2
24 232 231
2021104830
A micro piezoelectric axial flow fan
The present invention relates to a fan and, in particular, to a micro
piezoelectric axial flow fan for use in the fluid transportation fields.
A piezoelectric fan is a fluid drive device driven by a piezoelectric
vibrator. Its function is to provide a specific flow of gas at the axial outlet.
The piezoelectric fan may be used for active cooling, gas conveying,
pneumatic drive in instrumentation, testing equipment, and mechanical
electronics. These fans typically may have the advantages of simple
structure, easy mass production, small size, easy miniaturization, easy
digital control, and long life. The previous piezoelectric fluid drive device,
namely the piezoelectric pump, is mainly used to transport liquid, but the
effect of transporting gas is not ideal. That is mainly due to the
complicated structure of the valving pump in the past piezoelectric pump,
although it may provide a larger output pressure. However, as a fan or
cooling system, the air volume provided is too small, which may limit its
application; and the previous valveless pump structure is mainly designed
for liquid, and gas and liquid have different characteristics in flow resistance and flow characteristics, so in piezoelectric fans need to solve the problem of gas delivery rate.
In order to solve the problems of the current piezoelectric fluid drive
equipment with weak gas driving ability and low fluid delivery rate, a
micro piezoelectric axial flow fan is proposed. The piezoelectric axial
flow fan is composed of a piezoelectric vibrator and a base. This
arrangement has the characteristics of simple structure, convenient for
large-scale production, and is particularly suitable for conveying gas.
In order to achieve the above objectives, the present invention adopts the
following technical solutions:
A micro piezoelectric axial flow fan comprising:
(a) a piezoelectric vibrator
(b) a base, a rectangular block with a smaller thickness, having a
piezoelectric vibrator mounting slot on the top surface of the rectangular
block which can install the piezoelectric vibrator and two rectangular
holes in two vertical directions on the side, and the depth of the
piezoelectric vibrator mounting slot is greater than that of the
piezoelectric vibrator. The sum of the total thickness of the vibrator and
the peak displacement of the centre point of the piezoelectric vibrator to ensure that the movement of the piezoelectric vibrator does not interfere after installation, wherein
(c)The piezoelectric vibrator mounting slot having a cavity slot in the
centre of the bottom, which can form a sealed cavity with the
piezoelectric vibrator after installation and the cavity slot. The depth is
greater than the movement amplitude of the centre point of the
piezoelectric vibrator and less than 2mm, which can reduce the influence
of gas compressibility while ensuring that the displacement of the
piezoelectric vibrator does not interfere, wherein
(d)The cavity slot having a flow hole at the centre position of the bottom,
which can connect the cavity to the external air;
In a preferred form of the present invention, the piezoelectric vibrator is
formed by bonding a piezoelectric wafer and an elastic plate. Under the
action of alternating voltage, the centre of the piezoelectric vibrator may
reciprocate along its axis.
In a preferred form of the present invention, the two rectangular holes are
interconnected and connected with the flow hole, and the flow hole is
divided into two parts: internal flow hole and external flow hole. In a
preferred form of the present invention, the base is a single part without
assembly. It has the characteristics of facilitating large-scale automated
assembly while forming the fluid transport function. Compared with the
previous solution of multi-part assembly to form the base, it has obvious advantages. It only needs to be combined with a piezoelectric vibrator that can form the final micro piezoelectric fan.
During operation, the piezoelectric vibrator may be reciprocating bending
deformation under the action of alternating voltage; and the volume of the
cavity may increase and decrease with the movement of the piezoelectric
vibrator. When the volume of the cavity increases, the pressure inside the
cavity decreases at the same time, the gas flows into the internal flow
hole from the external flow hole and passing through the rectangular hole,
and the fast flow velocity forms a local low-pressure area, then the
external gas may be absorbed into the cavity along the rectangular hole.
When the volume of the cavity decreases, the gas is discharged from the
cavity and flows through the internal flow hole to the external flow hole.
When the gas is passing through the rectangular hole, a local
low-pressure zone appears. The external gas may be absorbed into the
cavity along the rectangular hole. In a working cycle, there is always a
low-pressure area at the intersection of the rectangular hole and the flow
hole; that is, the external gas may be absorbed in both processes (local
low-pressure area and volume of the cavity increasing) , and the finally
absorbed gas may flow out from the external flow hole to the outside. The
amount of gas discharged from the external flow hole is greater than that
absorbed in from the external flow hole, and finally, the gas flowing into the cavity from the rectangular hole and flowing out through the external flow hole to the outside that formed the directional driving capability.
Figure 1 is a schematic diagram of the structure of a micro piezoelectric
axial flow fan of the invention.
Figure 2 is a complete machine diagram of a micro piezoelectric axial
flow fan of the present invention.
Detailed description of the invention
According to Fig. 1 and Fig. 2, the micro piezoelectric axial flow fan of
the present invention is composed of a piezoelectric vibrator (1) and a
base (2), wherein:
The piezoelectric vibrator (1) is composed of a piezoelectric wafer (11)
bonded to an elastic plate (12).
The base (2), a rectangular block with a smaller thickness, has a
piezoelectric vibrator mounting slot (21) arranged on the top surface of
the rectangular block, which can install the piezoelectric vibrator (1); the
depth of the piezoelectric vibrator (1) installation slot (21) is greater than
the total thickness of the piezoelectric vibrator (1) and the piezoelectric
vibrator centre point displacement. The piezoelectric vibrator mounting
slot (21) has a cavity slot (22) in the centre of the bottom, which can form a sealed cavity (3) with the piezoelectric vibrator (1) after installation; the depth of the cavity slot 22 is greater than the motion amplitude of the piezoelectric vibrator (1) centre point and is less than 2mm.The cavity slot (22)has a flow hole (23) at the centre position of the bottom, which can be communicated with the external air cavity (3); The base (2) has the first rectangular hole (24) and the second rectangular hole (25) in two vertical directions on the side. The two rectangular holes are interconnected and connected with the flow hole (23). The flow hole (23) is divided into two parts: internal flow hole (231) and external flow hole
(232).
Claims (3)
1. A micro piezoelectric axial flow fan comprising:
(a) a piezoelectric vibrator
(b) a base, a rectangular block with a smaller thickness, having a
piezoelectric vibrator mounting slot on the top surface of the rectangular
block which can install the piezoelectric vibrator and two rectangular
holes in two vertical directions on the side, wherein
(c)The piezoelectric vibrator mounting slot having a cavity slot in the
centre of the bottom, which can form a sealed cavity with the
piezoelectric vibrator after installation , wherein
(d)The cavity slot having a flow hole at the centre position of the bottom,
which can connect the cavity to the external air cavity;
2. The fan of claim 1, wherein the piezoelectric vibrator
can be a unimorph piezoelectric vibrator, which is formed by pasting a
piece of the piezoelectric wafer on an elastic plate; it also can be used by
two pieces of the piezoelectric wafer on the elastic plate on both sides of
the formation of the bimorph piezoelectric vibrator.
3. The fan of claim 1, wherein the two rectangular holes are
interconnected and connected with the flow hole, and the flow hole is
divided into two parts: internal flow hole and external flow hole.
Figure.2 Figure.1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021104830A AU2021104830A4 (en) | 2021-08-02 | 2021-08-02 | A micro piezoelectric axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021104830A AU2021104830A4 (en) | 2021-08-02 | 2021-08-02 | A micro piezoelectric axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021104830A4 true AU2021104830A4 (en) | 2022-05-26 |
Family
ID=81653867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021104830A Ceased AU2021104830A4 (en) | 2021-08-02 | 2021-08-02 | A micro piezoelectric axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021104830A4 (en) |
-
2021
- 2021-08-02 AU AU2021104830A patent/AU2021104830A4/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| DA3 | Amendments made section 104 |
Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE PRIORITY DETAILS TO REMOVE ZL201420396465.9 18 JUL 2014 CN |
|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |