Air ozonator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electronics in medicine
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This device will be useful for cleaning indoor air or killing bacteria in infectious diseases. A low concentration of ozone also makes it possible to improve the long-term storage of products, for example in the cellar.
The operation of the device is based on the property of air, when electric sparks are passed through it, to form a new substance - ozone. Under normal conditions, it is a gas that has a characteristic odor (the ozone molecule consists of three oxygen atoms and, under natural conditions, is located in the upper layers of the atmosphere and is formed as a result of atmospheric discharges).
Rice. 1. Schematic diagram of the air ozonator
As a strong oxidizing agent, ozone kills bacteria and therefore can be used, for example, for water disinfection and air disinfection. But you should know that ozone is poisonous and its maximum content in the air is 0,00001%. At this concentration, its smell is well felt.
In the device diagram (Fig. 6.21), an electric arc is formed on the emitter A1, through which the air flow passes. To form a uniformly distributed arc on the emitter, it is necessary to obtain a high voltage (15...80 kV) of sufficient power. This is done using a converter circuit and transformer T1. In the primary winding T1, the thyristor VS1 generates pulses due to the discharge of capacitors C1 ... C3 through the winding. Controls the operation of the thyristor oscillator transistor VT1. Resistor R2 is chosen so that when the voltage across capacitors C1 ... C3 reaches 300 V (due to the charge from the network), the thyristor VS1 opens.
The device is not critical to details, and resistors may have values close to those indicated in the diagram. Capacitors C1 ... C3 type MBM, K42U-2, for an operating voltage of at least 500 V, C4 - K73-9 for 100 V. Diodes VD1 ... VD4 can be replaced with an assembly KTs405Zh, V.
Rice. 2. Frame for winding a high-voltage transformer T1
The high-voltage transformer T1 is made on transformer iron plates assembled in a package (Fig. 6.22). This design eliminates the magnetization of the core. Winding is performed turn to turn: first, the secondary winding - 2 - 2000 turns with PEL wire with a diameter of 0,08 ... 0,12 mm (in four layers), then the primary - 1 - 20 turns. Interlayer insulation is best done with several layers of thin (0,1 mm) fluoroplastic tape, but capacitor paper is also suitable (it can be obtained from high-voltage non-polar capacitors).
After winding the windings, the transformer must be filled with epoxy glue. It is advisable to add a few drops of condenser oil to the adhesive before pouring and mix well.
For the convenience of pouring, it is possible to make a cardboard frame according to the dimensions of the transformer, where the sealing is performed.
A transformer made in this way provides a voltage amplitude of more than 90000 V in the secondary winding, but it is not recommended to turn it on without a protective arrester F1, since a breakdown inside the coil is possible. The protective arrester is made of two bare wires located at a distance of 20 ... 24 mm (for air, the breakdown voltage is approximately 3 kV per 1 mm of gap).
The design of the emitter A1 is shown in fig. 6.23. Structural elements are mounted on side plates made of plexiglass 5...10 mm thick (not shown in the figure). In the gap between the conductive plates and the glass (1 mm), a uniformly distributed arc is formed. It is clearly visible when darkened - a blue stripe and a characteristic smell.
For greater efficiency of the device, you can use any fan, for example, type VN-2 - it will speed up the air circulation in the working area of the emitter.
The described device creates a low concentration of ozone, and to freshen the air in a residential area, it needs to work for 10...20 minutes.
Rice. 3. The design of the emitter A1
Publication: cxem.net
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Sergei
The transformer is replaced by a car reel. It is safer to use a two-pin ignition coil from the Oka, Volga, half of a three-pin three-wire ignition module from the Zhiguli, you can cut the coil from the four-pin ignition module of the first injection Zhiguli. Instead of R1, it is better to put a choke from a tube TV, or a fluorescent lamp.
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