Piezoelectric Cooling Fan
A piezoelectric cooling fan comprises a support frame and two piezoelectric actuators. Each piezoelectric actuator includes an electrical-conductive plate and a piezoelectric plate attached to the electrical-conductive plate, wherein an edge portion of the electrical-conductive plate is fixedly attached to a base of the support frame and approximately aligned with an edge portion of the piezoelectric plate attached thereto. The two piezoelectric actuators are symmetrically arranged with respect to the base of the support frame to define a cavity therebetween and are electrically connected with an AC power source, so that the piezoelectric actuators can be driven to flex towards and away from each other with respect to the edge portions of the piezoelectric actuators, so that air pulses can be induced from the cavity between the piezoelectric actuators for heat dissipation. The piezoelectric cooling fan is light, compact, low noise, low power, and free of electromagnetic interference.
The present invention relates to a piezoelectric cooling fan and, more particular, to a cooling fan which does not employ a rotary motor and can achieve a design that is light, compact, low noise, low power, and free of electromagnetic interference.
(b) DESCRIPTION OF THE PRIOR ARTBased on long-term experience of related works and constant test and innovation, the applicant has contrived a piezoelectric cooling fan that is light, compact, low noise, low power, and free of electromagnetic interference.
SUMMARY OF THE INVENTIONThe primary object of the present invention is to provide a piezoelectric cooling fan that employs slim piezoelectric actuators and can achieve a design that is light, compact, low noise, low power, and free of electromagnetic interference.
To achieve the above object, the piezoelectric cooling fan may comprise a support frame and two piezoelectric actuators. Each piezoelectric actuator includes an electrical-conductive plate and a piezoelectric plate attached to the electrical-conductive plate, wherein an edge portion of the electrical-conductive plate is fixedly attached to a base of the support frame and approximately aligned with an edge portion of the piezoelectric plate attached thereto. The two piezoelectric actuators are symmetrically arranged with respect to the base of the support frame to define a cavity therebetween and are electrically connected with an AC power source, so that the piezoelectric actuators can be driven to flex towards and away from each other with respect to the edge portions of the electrical-conductive plates and the piezoelectric plates, so that air pulses can be induced from the cavity between the piezoelectric actuators for heat dissipation.
According to one aspect of the present invention, the piezoelectric cooling fan may further comprise two protective covers being respectively placed over the piezoelectric plates and mounted to the support frame.
In operation, when the piezoelectric actuators are energized with an AC power source, the remaining portions other than the edge portions of the electrical-conductive plates and the piezoelectric plate can be driven to flex towards and away from each other with respect to the edge portions of the electrical-conductive plates and the piezoelectric plates, so that air pulses can be induced from the cavity between the piezoelectric actuators for heat dissipation. The piezoelectric cooling fan can achieve a design that is light, compact, low noise, low power, and free of electromagnetic interference.
Other objects, advantages, and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
FIG 1A shows a sectional view of the conventional cooling fan taken along line A-A in
To allow the features and advantages of the present invention to be fully understood, one embodiment of the present invention is illustrated in the following paragraphs with reference to the accompanying drawings.
As shown in
In operation, when the piezoelectric actuators 12 are energized with an AC power source, the remaining portions other than the edge portions of the electrical-conductive plates 121 and the piezoelectric plates 122 will be driven to flex towards and away from each other with respect to the edge portions of the electrical-conductive plates 121 and the piezoelectric plates 122, so that air pulses can be induced from the cavity between the electrical-conductive plates 122 for heat dissipation. As shown in
As a summary, the piezoelectric cooling fan of the present invention can achieve a design that is light, compact, low noise, low power, and free of electromagnetic interference. Therefore, the present invention is a useful creation.
Although the present invention has been described with a certain degree of particularity, it is understood that the present disclosure is made by way of example only and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention hereinafter claimed.
Claims
1. A piezoelectric cooling fan, comprising:
- a support frame, and
- two piezoelectric actuators each including an electrical-conductive plate and a piezoelectric plate attached to the electrical-conductive plate, wherein an edge portion of the electrical-conductive plate is fixedly attached to a base of the support frame and approximately aligned with an edge portion of the piezoelectric plate attached thereto, the two piezoelectric actuators being symmetrically arranged with respect to the base of the support frame to define a cavity therebetween and being electrically connected with an AC power source, so that the piezoelectric actuators can be driven to flex towards and away from each other with respect to the edge portions of the electrical-conductive plates and the piezoelectric plates, so that air pulses can be induced from the cavity between the piezoelectric actuators for heat dissipation.
2. The piezoelectric cooling fan of claim 1, further comprising two protective covers being respectively placed over the piezoelectric plates and mounted to the support frame
3. The piezoelectric cooling fan of claim 2, wherein the protective covers are made of resin, paper, or composite material.
4. The piezoelectric cooling fan of claim 1, wherein each electrical-conductive plate is rectangular and has a length of Lm, an effective length of Lme, and an effective width of Wme; each piezoelectric plate is rectangular and has a length of Lc, an effective length of Lce, and an effective width of Wee; wherein the ratio of Lce to Lme is less than or equal to 1.0 and is greater than or equal to 0.1; the ratio of Wce to Wme is less than or equal to 1.0 and is greater than or equal to 0.5., and wherein all the ratios are further limited such that the ratio of Lee to Lme is less than or equal to 0.6 and is greater than or equal to 0.4; the ratio of Wce to Wme is less than or equal to 1.0 and is greater than or equal to 0.96.
5. The piezoelectric cooling fan of claim 1, wherein the support frame is made of metal, plastic, engineering plastic, ceramic, or composite material.
6. The piezoelectric cooling fan of claim 1, wherein the electrical-conductive plates are made of metal or composite material with electrical conductivity
Type: Application
Filed: Feb 7, 2013
Publication Date: Aug 7, 2014
Applicant: BELLTEC ELECTRONICS CO., LTD. (NEW TAIPEI CITY)
Inventor: CHUAN-CHIN CHIANG (NEW TAIPEI CITY)
Application Number: 13/762,312
International Classification: F04B 35/04 (20060101);