Patent Application
20080245892
1. Field of the invention
The present invention relates to a decay-prevention structure of a heating dissipating board of a humidifier, more particularly one, which can effectively prevent the heat dissipating board from decaying, thus allowing heat produced by a piezoelectric crystal of the humidifier to be effectively dissipated to ensure necessary power of ultrasonic vibration of the humidifier.
2. Brief Description of the Prior Art
In order to prevent people from being subjected to bad effects of very dry room air, which can be caused by use of air conditioners and heaters, humidifiers are developed. A common humidifier comprises a water storage tank, and a heater for heating water so as to produce steam, which will be immediately sent out to increase humidity of the room.
A kind of humidifier includes a water storage tank, a conduit, and a heating unit; in use, water flows from the water storage tank to the heating unit through the conduit, and the heating unit heats the water so as to produce steam, which is blown out to the room through an outlet to increase the humidifier of the room by means of a blower.
Another kind of humidifier exploits the ultrasonic vibration principle, capable of breaking water into molecules and making the molecules dissolve in air by means of using ultrasonic vibration. Ultrasonic wave is a kind of mechanical wave, and needs a medium such as water and other kinds of liquids to help its energy pass on in tissues of living things in the form of longitudinal wave. Such a humidifier includes a piezoelectric crystal, which will change in size and vibrate to produce ultrasonic waves when being subjected to piezoelectric effect. And, the ultrasonic waves are passed on to break water into molecules. A large power will be produced when electric energy is being transformed into ultrasonic waves. Therefore, heat produced by the piezoelectric crystal should be efficiently dissipated, and such a humidifier is usually equipped with a heat dissipating board, which is positioned on an upper side of the piezoelectric crystal. Because the heat dissipating board is constantly in touch with water (medium), it is prone to rust and will have a rust layer forming thereon after it has been used for a long period of time. Consequently, heat dissipation effect is reduced, resulting in poorer performance of the piezoelectric crystal. To overcome the above problems, the medium-touched side of the heat dissipating board is usually covered with metal by means of electroplating or coated with Teflon. However, the metal/Teflon coating is prone to peel off after use. Therefore, these approaches to the above-mentioned problems aren't satisfactory.
It is a main object of the present invention to provide a decay-free heat dissipating board of a humidifier to overcome the above-mentioned problems.
A humidifier according to an embodiment of the present invention includes a water storage tank, a working tank, a piezoelectric crystal, a filtering unit, and a heat dissipating board. The filtering unit is positioned in the water storage tank for filtering water before water is sent into the working tank. The piezoelectric crystal will vibrate so as to produce ultrasonic waves to break water contained in the working tank into molecules, which will dissolve in air immediately. The heat dissipating board is interposed between an upper side of the piezoelectric crystal and water contained in the working tank so as to be in touch with the water. More particularly, the heat dissipating board has a decay-prevention stainless steel layer on an upper side thereof therefore it isn't possible for the heat dissipating board to decay and rust.
The present invention will be better understood by referring to the accompanying drawings, wherein:
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From the above description, it can be seen that the present invention has the following advantages over the prior arts:
1. The humidifier has the decay-free heat dissipating board on the piezoelectric crystal, which can help to dissipate heat produced by the piezoelectric crystal effectively and efficiently.
2. The heat dissipating board of the humidifier has the decay-prevention stainless steel layer on the upper side to be in touch with water. Therefore, water can't cause the heat dissipating board to decay to reduce its heat dissipating capability.
3. The decay-prevention stainless steel layer is fixed to the upper side of the heat dissipating board by means of roller pressing and recessing the decay-prevention stainless steel layer. Therefore, it isn't possible for the decay-prevention layer to fall off of the heat dissipating board.
