TWI465647B - Piezoelectric fan - Google Patents

Description

Piezoelectric fan

The present invention relates to a fan, and more particularly to a piezoelectric fan.

According to the principle of piezoelectric effect, the piezoelectric material can generate a voltage when subjected to mechanical strain. The piezoelectric effect can also be reversed so that the piezoelectric material changes shape slightly when subjected to an applied voltage. Piezoelectric materials have been used as components in piezoelectric fans.

Conventional piezoelectric fans generally have a few blades and a small amount of air generated, or the generated wind is relatively dispersed, resulting in less one-way airflow and less significant cooling effect.

In view of the above, it is necessary to provide a piezoelectric fan to increase the unidirectional air volume of the piezoelectric fan.

A piezoelectric fan includes a casing and a fan body mounted in the casing. The casing is provided with an air inlet and an air outlet. The fan body includes a plurality of blades, an annular connecting portion and a plurality of a vibrating piece of the piezoelectric piece, one end of the vane is fixed on the connecting portion and uniformly distributed along a radial direction of the connecting portion, and one end of the vibrating piece is fixed on the connecting portion to drive the connecting portion around the center thereof Swinging back and forth, the piezoelectric fan further includes a wind guiding plate, the wind guiding plate is provided with at least one opening corresponding to the blades, and the wind guiding plate forms a wind channel together with the casing. The air duct guides the wind blown from the opening to the air outlet.

The piezoelectric fan of the present invention drives the plurality of blades to resonate to generate wind through the vibrating piece to which the piezoelectric piece is attached, and uses the wind guide plate to guide the wind generated by each blade to the air outlet, which not only consumes low energy, but also has low noise, and The unidirectional airflow is larger than that of the conventional piezoelectric fan.

Referring to FIG. 1 to FIG. 7 , a preferred embodiment of the piezoelectric fan 1 of the present invention includes a housing 2 , a fan body 3 mounted in the housing 2 , and a wind deflector 4 .

The housing 2 includes an upper cover 24 and a lower cover 26. The upper cover 24 and the lower cover 26 are connected and fixed by a snap fastener or a threaded fastener. The upper cover 24 is further provided with an air inlet 242. In other embodiments, the air inlet 242 may also be disposed on the lower cover 26. After the upper cover 24 and the lower cover 26 are fixed together, one end of the upper cover 24 and the lower cover 26 form a square air outlet 22. In other embodiments, the air outlet 22 may also be circular or other shape. Referring to FIG. 2 and FIG. 3 together, a middle portion of the lower cover 26 is provided with a square fixing portion 262, and a recess is provided. The side wall 2622 of the fixing portion 262 is provided with a through hole 2624. In other embodiments, the fixing portion 262 may be disposed at an intermediate position of the upper cover 24 or at an intermediate position of the upper cover 24 and the lower cover 26. The fixing portion 262 may also be circular.

The fan body 3 includes a plurality of blades 32, an annular connecting portion 34, two vibrating pieces 36, and a mandrel 38. The connecting portion 34 is made of an insulating lightweight material such as polycarbonate (PC) or the like. The blades 32 are sheets made of polyester film, plastic, steel or other metal, and one end thereof is fixed to the connecting portion 34 by a snap or a threaded fastener, and is evenly distributed along the radial direction of the connecting portion 34. . In other embodiments, the vanes 32 can be integrally formed with the connecting portion 34. As shown in FIGS. 4 and 5, each of the vibrating pieces 36 includes a piezoelectric piece 362, a fixing portion 364, and a vibrating portion 366. Each of the piezoelectric sheets 362 is made of piezoelectric ceramic and is disposed on one side of a vibrating piece 36 provided at one end of the vibrating portion 366. The piezoelectric sheets 362 on the two vibrating pieces 36 are arranged in parallel in the same polarity. The fixing portion 364 is provided with two through holes 3642 and two electrodes 3644. The vibrating pieces 36 are fixed to the mandrel 38 by the two screws passing through the through holes 3642 and screwed to the fixing holes (not shown) of the mandrel 38. The electrodes 3644 are used to connect an alternating current. Each of the vibrating portions 366 is a thin piece made of a polyester film or other insulating lightweight material, and one end away from the fixing portion 364 is connected to the connecting portion 34. In the present embodiment, the two vibrating pieces 36 are symmetrically distributed along a diameter direction of the connecting portion 34. In other embodiments, the fan body 3 may be provided with a plurality of vibrating pieces which are distributed at an equal central angle around the center of the connecting portion 34. One end of the mandrel 38 can be inserted into the recess of the fixing portion 262 of the housing 2, and the mandrel 38 can be locked through the through hole 2624 of the fixing portion 262 through a threaded fastener (not shown).

The wind deflector 4 is a partition surrounding the fan body 3 and located in the casing 2, and forms an air passage 44 together with the inner side of the casing 2. The wind deflector 4 is provided with a plurality of openings 42 corresponding to each of the vanes 32. As shown in FIG. 6 and FIG. 7 , in the embodiment, the openings 42 are square, and four edges of each opening 42 are provided with four triangular unidirectional limiting membranes 422 , and the unidirectional limiting membranes 422 . Made of a light-weight material with good toughness, such as polyvinyl chloride (PVC), etc., the one-way limiting film 422 is fixed on the four sides of each opening 42 in a pasting manner, and is arranged in a cross. The micro protrudes outward and its edges just join. When a wind blows toward the openings 42, the one-way restricting membranes 422 are blown open for air to pass, and the one-way restricting membranes 422 are automatically closed to prevent backflow when the wind blows. When the blades 32 vibrate faster, since the wind is always drawn from the air inlet 242 and blown out by the opening 42, the openings 42 are normally open. As shown in FIG. 3, the width of the air duct 44 gradually increases toward the air outlet 22 from the wind guide 22 toward the air guide plate 4 clockwise and counterclockwise.

When the electrodes 3644 of the two vibrating pieces 36 are connected to the alternating current, the piezoelectric sheets 362 are deformed by the alternating current to cause the two vibrating pieces 36 to flex and vibrate. Since the piezoelectric sheets 362 on the two vibrating pieces 36 are arranged in parallel in the same phase polarity, the vibrating pieces 36 simultaneously swing in the same direction around the mandrel 38, thereby driving the connecting portion 34 clockwise around the mandrel 38. Or the counterclockwise direction swings back and forth at the maximum angle, and the connecting portion 6 drives the upper blade 32 to swing together to generate wind, the wind flows in from the air inlet 242 on the casing 2, and then the wind blows the opening corresponding to the wind deflector 4 The one-way restricting diaphragm 422 on the 42 is blown into the air duct 44 and blown out from the air outlet 22 of the casing 2.

Referring to FIG. 8 , in another preferred embodiment, the air duct 44 of the piezoelectric fan 1 is further disposed with a wind block 28 adjacent to the first side of the air outlet 22 , and the air duct 44 is adjacent to the air outlet 44 . The first side is partitioned and the width of the air duct 44 is gradually increased from the wind block 28 counterclockwise around the wind deflector 4 to the second side of the air outlet 22 opposite the first side. In the present embodiment, the wind generated by the blades 32 is guided to the air outlet 22 in the counterclockwise direction along the air passage 44. In other embodiments, the wind block 28 is also disposed on the second side of the air outlet 22, and the width of the air passage 44 is winded from the wind block 28 clockwise around the wind deflector 4 The first side to the air outlet 22 gradually increases, and the wind generated by the blade 32 is guided to the air outlet 22 in the clockwise direction along the air passage 44.

In the piezoelectric fan of the present invention, the vibrating piece 36 to which the piezoelectric piece 362 is attached is used to oscillate a plurality of blades 32 to generate wind, and the wind generated by each blade 32 is guided to the air outlet 22 by the wind deflector 4, which is not only Compared with the conventional fan, it consumes less energy, has less noise, and has a larger unidirectional air output than the conventional piezoelectric fan.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

1‧‧‧Piezoelectric fan
2‧‧‧Shell
3‧‧‧Fan body
4‧‧‧Wind guide board
22‧‧‧air outlet
24‧‧‧Upper cover
242‧‧‧Air inlet
26‧‧‧Under the cover
262, 364‧‧‧ Fixed Department
2622‧‧‧ side wall
2624, 3642‧‧‧through hole
28‧‧‧wind block
32‧‧‧ blades
34‧‧‧Connecting Department
36‧‧‧vibration
362‧‧‧ Piezo Pieces
3644‧‧‧electrode
366‧‧‧Vibration Department
38‧‧‧ mandrel
42‧‧‧ openings
422‧‧‧One-way limiting diaphragm
44‧‧‧ wind tunnel

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of a piezoelectric fan of the present invention.

Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1;

Figure 3 is a plan view of Figure 1 with the upper cover removed.

Fig. 4 is a plan view showing a partial structure of a vibrating piece of a preferred embodiment of the piezoelectric fan of the present invention.

Figure 5 is a left side view of Figure 4.

Fig. 6 is a perspective view showing a partial structure of a wind deflector of a preferred embodiment of the piezoelectric fan of the present invention.

Fig. 7 is a perspective view showing another state of Fig. 6.

Fig. 8 is a plan view showing another preferred embodiment of the piezoelectric fan of the present invention with the upper cover removed.

1‧‧‧Piezoelectric fan

3‧‧‧Fan body

4‧‧‧Wind guide board

22‧‧‧air outlet

26‧‧‧Under the cover

262‧‧‧ Fixed Department

2622‧‧‧ side wall

32‧‧‧ blades

34‧‧‧Connecting Department

36‧‧‧vibration

38‧‧‧ mandrel

42‧‧‧ openings

422‧‧‧One-way limiting diaphragm

44‧‧‧ wind tunnel

Claims (9)

A piezoelectric fan includes a casing and a fan body mounted in the casing. The casing is provided with an air inlet and an air outlet. The fan body includes a plurality of blades, an annular connecting portion and a plurality of a vibrating piece of the piezoelectric piece, one end of the vane is fixed on the connecting portion and uniformly distributed along a radial direction of the connecting portion, and one end of the vibrating piece is fixed on the connecting portion to drive the connecting portion around the center thereof The wind is swung back and forth, and the wind flows in from the air inlet. The improvement is that the piezoelectric fan further includes a wind guide plate, and the wind guide plate is provided with at least one opening corresponding to each blade, and the wind guide plate A duct is formed with the casing, and the duct can guide the wind blown from the fan body to the air outlet through the openings. The piezoelectric fan according to claim 1, wherein the wind deflector is provided with a plurality of unidirectional restriction diaphragms that are openable and closable at a periphery of each opening. A piezoelectric fan according to claim 2, wherein each opening has a square shape, and the periphery of the opening is provided with four triangular unidirectional restriction diaphragms. The piezoelectric fan according to claim 1, wherein the fan body further includes a mandrel that is fixable to the casing, the mandrel is located at a center of the connecting portion, and one end of the vibrating piece is fixed at the On the mandrel, the other end is fixed to the connecting portion. The piezoelectric fan according to claim 4, wherein the vibrating pieces are distributed at an equal central angle around a center of the connecting portion. The piezoelectric fan according to claim 4, wherein each of the vibrating pieces is provided with two electrodes connectable to alternating current, and the piezoelectric sheets of the vibrating pieces are disposed in the same polarity direction. The piezoelectric fan according to claim 1, wherein the width of the air passage gradually increases around the air guiding plate toward the air outlet and toward the air outlet. The piezoelectric fan of claim 1, wherein the piezoelectric fan further comprises a wind block disposed in the air passage. The piezoelectric fan of claim 8, wherein the wind block is disposed on a first side of the air outlet, and the width of the air passage is from the wind shield to the wind guide plate to the first The other side opposite to one side gradually increases.