Air conditioning apparatus and ion generating device for use therein
An air conditioning apparatus incorporates an ion generating device that generates positive and negative ions by applying an alternating-current voltage between electrodes. The generated positive and negative ions coexist in the air and, when they attach to the surfaces of airborne bacteria, they react chemically with each other and generate radical hydroxyl and hydrogen peroxide, which extract hydrogen atoms from the cells of the bacteria and thereby kill them. This sterilizing effect is combined with the temperature-conditioning, dehumidifying, humidifying, air-purifying, and other functions of the air conditioning apparatus to bring about a comfortable and healthful indoor environment.
1. An ion generating device, comprising:
a dielectric;
a pair of electrodes arranged so as to face each other with the dielectric sandwiched in between;
high alternating-current voltage generating means for applying an alternating-current voltage between the pair of electrode;
first generating means generating positive and negative ions;
second generating means for generating only negative ions; and
switching means for switching between the first and second generating means.
2. An ion generating device as claimed in claim 1 , wherein the switching means for switching between the first and second generating means comprises:
a diode having an anode thereof connected to one of the electrodes to which the voltage is not applied and having a cathode thereof grounded; and
a switching device connected between both ends of the diode.
3. An ion generating device as claimed in claim 2 , wherein positive and negative ions are generated when the switching device is turned on and only negative ions are generated when the switching device is turned off.
4. An ion generating device as claimed in claim 2 , wherein the switching device is a relay.
5. An ion generating device as claimed in claim 3 , wherein the switching device is a relay.
6. An air conditioning apparatus provided with the ion generating device as claimed in claim 1 and capable of selecting between operation that yields positive and negative ions to achieve a sterilizing effect and operation that yields only negative ions to achieve a relaxation effect.