Hand dryer is a sanitary appliance for drying hands or drying hands in bathroom. It is divided into induction automatic hand dryer and manual hand dryer. It is mainly used in hotels, restaurants, scientific research institutions, hospitals, public entertainment places and the bathroom of each family. The hand dryer overcomes the shortcoming that the existing hand dryer cannot discharge air in multiple directions, which easily causes the skin temperature of the hand to be too high, and aims to provide a hand dryer that circulates air in multiple directions. An air guide device is provided at the place, and the air guide device is provided with air guide blades. The technical scheme of circulating and non-directional air out of the hand dryer is caused by the rotation of the air guide device or the swing of the air guide blades.

Introduction

FEEGOO hand dryers are advanced and ideal sanitary cleaning appliances and equipment. After washing your hands, put your hands under the air outlet of the automatic hand dryer, and the automatic hand dryer will automatically send out comfortable warm air, which will quickly dehumidify and dry your hands. When it automatically shuts down the wind and shuts down. It can meet the requirements of not drying hands with a towel and preventing cross infection of diseases. The automatic induction high-speed hand dryer is an advanced and ideal sanitary equipment for food production enterprises, which can bring clean, hygienic, safe and pollution-free hand drying effects. After washing your hands, put your hands under the air outlet of the automatic induction high-speed hand dryer, and the automatic hand dryer will automatically send out high-speed warm air to quickly dry your hands. Hygiene requirements for hands and prevention of bacterial cross-contamination.

working principle

The working principle of the hand dryer is generally that the sensor detects a signal (hand), which is controlled to open the heating circuit relay and the blowing circuit relay, and start heating and blowing. When the signal detected by the sensor disappears, the contact is released, the heating circuit and the blowing circuit relay are disconnected, and the heating and blowing are stopped.

Heating system

Whether the heating device has heating device, PTC, electric heating wire.

1. No heating device, as the name implies, there is no heating device

It is suitable for places with harsh temperature requirements and places where hand dryers are frequently used.

For example: packaging workshop for quick-frozen vegetables and quick-frozen dumplings

2. PTC heating

PTC thermistor heating, because with the change of the ambient temperature, the power of the PTC heating also changes. In winter, the heating power of the PTC increases, and the temperature rise of the warm air from the hand dryer also increases, saving energy and environmental protection.

PTC is characterized by good temperature constancy, but it also has certain disadvantages, that is, the temperature of the heating wire does not rise as fast.

3. Electric heating wire heating

The traditional heating wire heating, the wind temperature rises quickly, but the wind temperature stability is poor, the wind temperature is easy to be high, and the opponent will be burned.

The high-speed hand dryer adopts the method of heating wire plus CPU and temperature sensor control to achieve the effect of fast and constant wind temperature rise. Even when the wind speed is as high as 100 m/s, the hand dryer can blow out constant warm air.

Usually, the noise of hand dryers mainly based on wind heating is relatively large, while the noise of hand dryers with hot air mainly based on heating is relatively small. Enterprises can choose according to their actual conditions.

Motor type

Motors are one of the core components of automatic induction high-speed hand dryers, in the form of capacitor asynchronous motors, shaded-pole motors, series-excited motors, DC motors, and permanent magnet motors. Hand dryers driven by capacitor asynchronous motors, shaded-pole motors, and DC motors have the advantage of low noise, while automatic induction high-speed hand dryers driven by series excitation motors and permanent magnet motors have the advantage of large air volume.

Dry hand mode

Heating-based and high-speed air drying

The heating-based hand dryer usually has a relatively large heating power, above 1000W, while the motor power is very small, only less than 200W. , take away the water on the hand, this method is relatively slow to dry hands, generally more than 30 seconds, its advantage is that the noise is small, so it is favored by office buildings and other spaces that need quiet.

The high-speed air hand dryer is characterized by a very high wind speed, which can reach a maximum of 130 m/s or more, the speed of drying hands within 10 seconds, and the heating power is relatively low, only a few hundred watts, and its heating function is only to maintain comfort. degree, basically does not affect the speed of drying hands. Because of its fast drying speed, it is welcomed by food factories, pharmaceutical factories, electronic factories, high-end office buildings (good sound insulation) and other places. It is also recommended by environmentalists because of its low energy consumption and the same drying speed as toilet paper. .

Common malfunctions

Fault phenomenon 1: Put your hand into the hot air outlet, no hot air is blown out, only cold air is blown out.

Analysis and maintenance: There is cold air blowing out, indicating that the blower motor is powered and working, and the infrared detection and control circuit is normal. There is only cold air, indicating that the heater is open circuit or the wiring is loose. After inspection, the heater wiring is loose. After reconnecting, there is hot air blowing out, and the fault is eliminated.

Fault phenomenon 2: After the power is turned on, the hand has not been placed on the hot air outlet. The hot air blows out of control.

Analysis and maintenance: After investigation, there is no breakdown of the thyristor, and it is suspected that the photosensitive tube inside the photocoupler ③ and ④ is leaked and broken down. After replacing the optocoupler, the work returned to normal, and the fault was eliminated.

Fault phenomenon 3: Put your hand into the hot air outlet, but no hot air is blown out.

Analysis and maintenance: check that the fan and heater are normal, check that the gate of the thyristor has no trigger voltage, and check that the c-pole of the control triode VI has a rectangular wave signal output. , ④ The forward and reverse resistances between the pins are infinite. Normally, the forward resistance should be several m, and the reverse resistance should be infinite. It is judged that the internal photosensitive tube is open circuit, resulting in the gate of the thyristor not getting the trigger voltage. Can’t turn on. After replacing the optocoupler, the problem is solved.

Buying Guide

When buying an automatic induction high-speed hand dryer, don’t just look at the price of the hand dryer itself. Although some hand dryers are very cheap, they are like tigers when used with electricity, and it is difficult to control the power consumption; or the performance is unstable and extremely inconvenient to use. Having the time or energy to get angry might as well buy a good one. Try to make a purchase after trying. Many small hand dryer manufacturers use hand dryers made of inferior materials, and the casing will deform after continuous use for a long time, posing a serious fire hazard. Food production enterprises should decide which type of hand dryer to buy according to their own needs and environmental factors; due to the large number of people in the food processing plant, it is not allowed to wait in line to dry hands before entering the clean workshop, so high-speed hand dryers are the most ideal choice. .

1. Shell: The shell material not only determines the appearance of the hand dryer, but unqualified materials may become a fire hazard. The better shell of the hand dryer is usually made of stainless steel, stainless steel paint, and engineering plastics (ABS).

It is recommended for the food industry to choose the natural color of 304 stainless steel, or the hand dryer of the natural color of ABS engineering plastic.

2. Weight: If it is necessary to consider the installation location and whether the material has enough capacity to bear the weight of the automatic hand dryer, for example, the weight of the cement brick wall can generally not be considered, but if it is a color steel plate, gypsum board and other materials, the load-bearing should be considered For capacity issues, color steel plates usually have to follow the opinions of color steel plate manufacturers, or hand dryer manufacturers provide test data for reference.

3. Color: The color of the hand dryer is relatively rich. Usually white and stainless steel are the best choices for food factories. If environmental factors must be considered, stainless steel baking paint is also a good choice.

4. Starting principle: manual timing switch, infrared induction, light blocking induction mode. The latter two are non-contact induction methods. It is recommended that food factories use hand dryers with the latter two activation methods, which can effectively avoid cross-infection.

5. Installation method: bracket installation, wall-mounted installation, and can be used directly on the desktop

a) There are two ways of bracket installation and wall-mounted installation

Usually the bracket installation method is the second choice when the wall can not meet the installation conditions, and the other is to use it under the unique and strict requirements for the cleanliness of the wall. The bracket installation is flexible and easy to use.

b) In most cases, it is recommended to install it on the wall, which is stable and durable.

c) The hand dryer placed directly on the desktop has such characteristics, it is easy to manage when placed on the desktop, and it can be placed in the place where it is used (DH2630T, HS-8515C and other hand dryers can be used in this way)

6. Working noise: the smaller the better under the condition that the drying speed can be satisfied.

7. Operating power: The lower the better, as long as the drying speed and comfort are met.

8. Hand drying time: the shorter the better, preferably within 10 seconds (basically the same time as using a paper towel).

9. Standby current: the smaller the better.

10. Wind temperature: It is usually more appropriate to choose a hand dryer with a wind temperature between 35 degrees Celsius and 45 degrees Celsius, which will not waste electricity and will not feel uncomfortable.

Precautions

When purchasing a hand dryer, consumers should decide which hand dryer to buy based on their needs and environment. PTC type hand dryers are different from heating wire type hand dryers. Consumers can also choose an air volume type hand dryer that uses wind as the main heat supplemented by the heat, or a hot air type hand dryer that mainly uses heat according to their own needs. When choosing an electromagnetic induction type hand dryer, it should be noted that this type of hand dryer is easily affected by the environment and objects. When choosing an infrared-sensing hand dryer, it should be noted that infrared-sensing hand dryers are also susceptible to light interference. When purchasing a hand dryer, you should also pay attention to which type of motor the hand dryer uses. There are many types of motors used in hand dryers, including capacitor asynchronous motors, shaded-pole motors, series-excited motors, DC motors, and permanent magnet motors. Hand dryers driven by capacitive asynchronous motors, shaded-pole motors, and DC motors have the advantage of low noise, while hand dryers driven by series motors and permanent magnet motors have the advantage of large air volume. Now the latest brushless DC motors combine With the above characteristics, low noise and large air volume, it has become the best choice for hand dryers.

1. The hand dryer with fast drying speed, environmental protection and energy saving is a wind-based, heating-assisted hand dryer. The characteristic of this hand dryer is that the wind speed is high, and the water on the hands is quickly blown away, and the heating function is only to maintain the comfort of the hands. Usually, the wind temperature is between 35-40 degrees. It dries hands quickly without burning.

Second, the main parameters of the hand dryer:

1. Shell and shell material not only determine the appearance of the hand dryer, but unqualified materials may become a fire hazard. Better hand dryer shells usually use ABS flame retardant plastic, metal spray paint, and engineering plastics.

2. Weight, mainly to consider whether the installation location and the material have enough capacity to bear the weight of the hand dryer. For example, the cement brick wall generally does not need to consider the weight problem, as long as the installation method is suitable, this is not a problem, but if it is a color Materials such as steel plates need to consider the load-bearing capacity, but some manufacturers of hand dryers provide brackets to solve such problems.

3. Color, color is mainly a matter of personal preference and the matching of the overall environment, and food factories, pharmaceutical factories, etc. should try to choose hand dryers with the original color, because the spray paint hand dryers may volatilize, which will affect food or medicine. security.

4. The starting method is usually manual and infrared induction. The new starting method is photoelectric type, which is characterized by fast starting speed and is not easily affected by the environment. For example, strong light may cause the infrared hand dryer to keep rotating or start by itself. It starts by blocking the amount of incoming light, thereby preventing the problem of infrared hand dryers, and also does not touch the hand dryer with hands, thereby preventing cross-infection.

5. Induction position, you can choose according to your needs

6. Working method, hanging on the wall or on the bracket, choose according to your own needs, it is recommended to use the bracket type when you move frequently

7. Working noise, usually the smaller the better

8. Hand drying time, the shorter the better

9. Standby current, the smaller the better

10. The air temperature depends on your own needs and the type of hand dryer you choose. Usually, it is advisable to choose one that does not burn for a long time.

Scope of application

It is suitable for star-rated hotels, guesthouses, public places, hospitals, pharmaceutical factories, food factories, airports, railway stations, office buildings, homes, etc. It is an ideal choice for you to pursue a noble and elegant life!