Humidifier is a useful thing, even if it is customary to think otherwise. Properly placed the case, significantly reduce the incidence of home. The main thing to fit the relative humidity indicators of the desired framework, doctors recommend a value of 45 - 60 percent. Although 65 deaths will not cause. The problem is limited to the purchase of a hygrometer, although not everyone can assemble a piezoelectric steam generator. What will face the started repairing a humidifier with your own hands? We plan to discuss today.
What are the air humidifiers
When the humidity decreases, the mucous membranes of the respiratory tract dry up. Epithelium contaminates bacteria that find favorable conditions for reproduction. The mucus ceases to protect the surface of the cells, the microflora without interference destroys the membranes, causing infectious diseases. A knowledgeable engineer will call three designs, from strength, one differs little from an electric kettle:
- Capacity, supplemented by a fan, is able to raise the relative humidity if you keep the device on for a long time. The process proceeds by forced blowing of the surface, accelerating evaporation.
- If the liquid is heated, the atmosphere is saturated with moisture much faster. The difference from the electric kettle in a lower temperature. It is quite possible to get burned, according to our estimates, the ceiling tile may disappear.
- Advanced is the method used by fireplaces that mimic orange flames. A quartz plate( piezocrystal) is subjected to a current of frequency exceeding the threshold of audibility, oscillations are created in time with the voltage. As a result of the contact of the element with water, the liquid begins to evaporate on the eyes. Steam visible to the naked eye, room temperature. Aggressiveness of the environment with respect to wallpaper, tile glue decreases.
In fireplaces, the flow of water molecules is illuminated by a lamp; it turns out to be such a real imitation of a flame that there is a fear of burning. Cold jet of vaporized liquid. To make the element work, the device is equipped with special mechanical strapping. There is no other word at the sight of miracles. The tank contains a groove with an emitter, located on the side of the float. In order not to make holes in the bottom, the sensor is magnetic. When the water in the humidifier runs out, the float goes down, the field is caught by the sensitive element of the electronic board. As a result, the device stops working.
In the Chinese models, you can find the impeller, through a small increase in the bottom pumps air inside. Let us try to describe the design so that buyers avoid errors:
- A bowl that resembles a kettle is placed on top of a housing containing electronics.
- In the center of the tank there is a vertical vent located above the radiator.
- Side recess, complemented by a float.
- The tank is filled from the bottom, the lid has a valve through which water is gradually etched.
- The tank has the shape of a cylinder with a cut-out in the form of a vent, the liquid slowly seeps into the working chamber.
- For the speedy spread of steam to the piezoelectric element of the air humidifier, a turbine opening emerges. It creates excess pressure, steam rushes out. Air is sucked from under the base through the cracks.
Note: if water is poured into the vent, fluid will flow through the turbine opening to the electronic circuits, causing a temporary or permanent fault. There is no grounding in the devices, making it extremely life-threatening.
Internal device of the air humidifier
The device of the air humidifier includes power supply boards, generating ultrasonic frequency. At the same time, fungi and microbes are killed inside. Readers are familiar with VashTehnik portal reviews regarding water purifiers. Entire pools are disinfected with ultrasonic emitters, microbes have no place inside the generators. The difference in power for a small tank is not necessary.
The power board forms the supply voltage of the active elements of the amplifier with positive feedback. Cascade oscillates. The transistor is mounted on the radiator to remove excess heat. The engine of the impeller is powered by rectified voltage, we do not exclude the presence of models using 230 volts.
First of all, we look at the nature of the malfunction. A working piezoelectric element is easy to determine by water bubbling. If the steam does not go outside, the turbine engine is probably to blame. We ring the windings, if in order, we measure the supply voltage. The tests will help determine the cause. In the absence of movement of the piezoelectric element, the first suspicion of the generator, the quartz crystal is sufficiently durable. It should be started by a power transistor, a remote thermometer is useful here. While working, the generator generates heat. Avoid thrusting your hand while the humidifier is energized, you can aim the remote meter at the desired point. In extreme cases, remove the plug from the outlet, feel the surface of the radiator with your finger. If completely cold, chances are for the generator to break.
Initially, we check the supply voltage, if in order, the transistor is ringing. If bipolar, each transition behaves like a diode, gives a low direct current resistance in one direction. In the field it all depends on the type, you have to look through the directory. Sometimes the oscillation is controlled by a triac, the likelihood of such a scenario seems unlikely. This is not a power unit using a cardinal approach. If this is the case, check the control pulse generator for operability.
Condensers are ringing, checked for swelling. Resistors should not be black( although most continue to work).Board tracks are checked for integrity. What else can break in the humidifier? Power Board!
humidifier power supply unit Typically, modern devices use a switching power supply unit with stabilization of the voltage schottky voltage rectified on Schottky diodes. At the input, after the power cord, there is a block( or a pair of terminals), from which the process of converting 230 volts to the desired nominal frequency begins. If an outdated power supply unit operates on a transformer from which 50 Hz is output, in our case, everything is different.
At the entrance of the humidifier are immediately one or more filters. This includes capacitors, chokes, resistors. Each item is checked for suitability. Separately, a voltage of a high-frequency pulse generator, controlled by a thyristor electrode, transistor, triac or other key element, is formed at the Zener diode. You can find the key on the radiator, a lot of heat is dissipated here.
Varistor protection comes separately. Variable resistances, depending strongly on the applied voltage. If the voltage soars up to the sky, the varistor closes the circuit to ground, the fuses. The protection is triggered, the device is turned off. The varistor stands at the input of the generator, there is no separate power supply unit for the cell, of course, it cannot consume 230 volts.
The fuses of the switching power supplies are replaced by low-impedance resistors. It will burn out from overload, at the same time it will limit the current, saving the elements of the air humidifier circuit from burning. A feature of the switching power supply is that in normal condition the current does not flow through the fuses. Therefore, using the popular method of localization of damage. A light bulb is switched on in the fuse circuit; if it is lit, troubleshooting is continued.
The diode bridge rectifies the voltage, after the key transistor, supplied to the transformer by high-frequency pulses. Can reduce the weight of the windings without loss of power. The transformer turns out compact, losses are reduced. At the output of the cascade are Schottky diodes, smoothing ripple filters.
If 230 volts is used to power the instrument, the high voltage lines are separated from the direct current path. The turbine can turn on the relay, the voltage for which is formed by a transistor key, a zener diode. Viewed according to the scheme.
The story about the repair of a humidifier with his own hands comes to an end. There are differences among models, but all devices are built on the same principle. The best are equipped with humidity sensors, standing at the entrance of the air intake path. Allows the device to shut off when the indicator reaches the set value. Be sure to have a relay interrupting the power of the keys in the power supply. As seen above, the causes of damage to humidifiers often lie in improper operation. That is why we recommend reading the instructions. By the way, the model from Germany is no easier in this respect than the Chinese. Properly operate the device, and the head will not hurt, how to fix the humidifier yourself.
And another thing! It is not recommended to fill the humidifier from the tap in areas with hard water. Although boiling as such does not occur, salts remain on the surface of the piezoelectric element, the bottom of the working chamber, forcing to periodically clean the device. It is better to use bottled water, filtered or distilled.
