Working principle of household hand dryer
The automatic hand dryer works by automatically sensing far infrared rays, and consists of an infrared emitter, a receiver, a monostable delay switch, a solid-state relay and a blower. And form a simple self-excited multivibrator. The infrared emission tube emits modulated infrared light with a frequency of about 40kHz.
When the hand reaches under the automatic hand dryer, a part of the emitted infrared ray is reflected by the hand, received by the phototransistor, converted into an electrical signal with the same frequency, amplified, shaped and band-pass compared by the preamplifier integrated circuit dedicated to infrared ray reception, and then output a low-level pulse signal, further triggering the monostable circuit to enter a transient state, so that it outputs a high level, emits light, and the AC solid-state relay is turned on, so that the hair dryer emits hot air when it is powered on.
When the hand is dry, the infrared pulse signal is lost and returns to high level, and the monostable circuit is quickly reset. Due to the delay, the hair dryer will automatically resume after working for about 10s at most, thus stopping working.
Simply put: infrared detection-relay-hot air blower? When the human hand approaches the infrared probe, the probe detects the human body signal; Logic circuit flip; Providing signals to the driving circuit; The relay works; Turn on the power supply of the hot air blower; Leave by hand; Circuit restoration; The hot air blower stops working; Wait for the next working signal.
Principle of induction hand dryer: induction is convenient and fast, blowing hot air can speed up the evaporation of water on hands and save users time. In other words, in the shortest time, the water on the user's hands will evaporate in a cleaner way. This method of drying hands is cleaner than wiping with a towel, and it is less prone to infection with bacteria. For more industry information, please refer to the market research and analysis report of hand dryer industry.
Analysis of Common Problems in Household Hand Dryer
1. The common problem is that there is no manufacturer's name, model, waterproof grade mark, assembly drawing and manual. Two. The identification of electrical appliances is not standardized, the rated voltage and power are not standardized, and the identification is incomplete.
Solution: Please read the details of the hand dryer carefully before buying. If the information is incomplete or inconsistent, please choose carefully or call for advice. In addition, it is recommended to buy some big brands of hand dryers to ensure after-sales and quality.
2. Exaggerate technical indicators. Deceiving and misleading consumers (mainly focusing on one-sided exaggeration of input power); Unqualified items are mandatory items closely related to users' personal safety and environmental safety.
Solution: There are some hand dryers produced by small manufacturers, and the technical parameters on them are inconsistent with the actual products. In this case, it is recommended to read more and choose more, and make a judgment according to the price of the hand dryer. If the price is very cheap but the hand-drying time is fast, it may not be in line with the actual parameters.
3. Does the infrared hand dryer always start by itself? What is the reason for stopping together? Sometimes it's fine, sometimes it's broken.
Solution: Check whether the position of infrared emitter is loose, or take it apart for cleaning to see if there is poor contact.
4. How to repair the hand dryer with black smoke? Ike's hand dryer seems to blow out smoke that smells of carbon and burning?
Solution: It may be that the wires inside are aging, so it is recommended to open them. If the wire is burnt, please contact the maintenance personnel to replace the burnt wire or parts.
After a brief introduction of the above contents, I believe you should have a more detailed understanding of the household hand dryer. Usually, it is common to use hand dryers in the bathroom. Usually, it has a sensing device, when the hand is close to the hand dryer, it will sense it, so that the hand dryer starts to work and generates hot air. When the hand can't feel it after leaving, the circuit is disconnected and stops working. There are many kinds of hand dryers on the market now, so you should choose them according to your actual needs, hoping to help you.
Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp； Wb, you can get it for free ~