Kinds and principle of operation of flawless fans

Fans have long been affordable and effective devices to help maintain the desired microclimate in an apartment or office. From the pressure, temperature, relative humidity, air velocity of such a device will depend on the health, well-being and performance of people in the room.

The simplest device for forced air circulation in the room is a fan - impeller with blades, mounted on the motor shaft without a gearbox. All fans with open blades have a very unpleasant "side effect" - noise that occurs due to a sharp change in the speed and direction of the air flow on the blades.At low revs, the sound resembles the rumble of a low-flying airplane, at high revolutions - a whistle.

The famous English scientist James Dyson for a long time worked on the creation of a device for convection of indoor air, which works without noise and drafts. He tried the idea of ​​Nikola Tesla to accelerate the air flow using a high-frequency electric field of high voltage. Soon, the scientist abandoned this idea - high voltage required good insulation and created toxic oxides of nitrogen and metals due to the glow discharge between the electrodes.

The second idea that Dyson tried was his own. He wanted to create a fan without a major drawback - increased noise at work, arising from a sudden change in the speed and direction of air flow. The case of the fan, which resembles the wing of a plane in profile, was made by a scientist in the form of a ring with a slit-like slot for air to flow around the circumference. A high-speed air turbine without blades, by design resembling a water mill, is located at the bottom of the hull. It sucks air through the slots and supplies it to the second high-pressure turbine, located at the top near the ring.Compressed air at high speed exits through a narrow slit in a plastic ring.

The pressure drop at the air outlet through the gap, which resembles the wing of an aircraft in a profile, twists the surrounding air. A powerful air spiral like a big bagel moves forward along the axis of the ring, intensively dragging the surrounding air along the law of Bernoulli and creating a zone of turbulence around itself.

Turbine-free fan turbine design protected by patent, therefore, it is not possible to describe in detail the device of the main unit of a fanless fan. According to information from open sources, it is known that the turbine of the fan uses Air Multiplier technology. According to an independent examination, the type of a flapless fan is one of the most quiet and economical. It is ISO certified.

The work of a tableless fanless fan is based on the principle of a centrifugal air turbine. In the process, there is a soft air flow, which comfortably cools the air in the summer heat. The speed and distribution of the flow do not create drafts.Air is sucked into the device through narrow slits using a bladeless impeller mounted on a high-speed motor shaft without a gearbox. By design, the impeller resembles a gas turbine.

To reduce the noise intake air passes through the chamber of Gemholtz, which due to the reverse resonance absorbs noise. Next, air is supplied through a tube to the ring with a slit hole around the perimeter, which in cross section resembles an airplane wing. At the outlet, air forms a laminar flow, which, due to the aerodynamic profile of the slit hole, flows at high speed, causing a pressure drop in the zone of high-speed air flow.

According to Bernoulli's law, the pressure drop in the zone of high-speed flow carries the surrounding air with it, increasing the mass moving with great speed almost fifteen times. The impact of a fanless fan on the microclimate in a room can be multiplied if the tank in the case is filled with water or a simple ultrasonic humidifier is placed in front of the fan in the direction of air movement. The air temperature decreases at the same time by 3-5 ° C. If more intensive cooling is required, the reservoir can be filled instead of water:

• dry ice (t - 78.5 ° C);
• a mixture of ice and salt (23.1% NaCl, 76.9% ice, t —21.2 ° C);
• a mixture of ice with calcium chloride (29.9% CaCl2, 70.1% ice, t - 55 ° C).

The following year, the company Exhale Fans begins production of the ceiling-free model fan developer Nick Heiner. Ceiling fan provides a more correct distribution of cool air along the walls of the downward flow. Compared to the floor model, an innovative fan eliminates the occurrence of turbulent airflows and drafts, and does not take up extra space on the floor.

Bladeless fans, like other models, have a number of advantages and disadvantages. Advantages:

• no open moving parts, this ensures the safety of children and animals;
• do not overdry air;
• do not require maintenance.

Disadvantages:

• noise during operation of about 40 decibels;
• relatively high price;
• fragile housing design.

The table fan allows you to supply fresh air to the workplace, cool powerful computer equipment, hot meals and drinks, and conduct aromatherapy at home.It can be easily transferred from one place to another. Floor fan is designed for installation on the floor. High power and speed of air flow make it possible to provide comfortable conditions in a separate room, office or apartment. A slight increase in noise is eliminated by removing the device from the person. The shape and parameters of the fan allow you to completely replace the air in the room in a few hours.

A portable fan can be used on the beach, on a camping trip., caves, desert, tent, train, car, yacht on the high seas. Most portable models are powered by a built-in battery, a computer's USB port, and more expensive ones are powered by solar batteries. Their main advantages are low weight and size, energy autonomy. A special place among the portable models is occupied by car bezlopastnye fans powered by a car 12V. They are much cheaper than car air conditioners, allow you to quickly ventilate the car, remove odors of gasoline, diesel fuel, car enamel, synthetic glue and primer.

First you need to determine place to install the fan:

• on the desktop;
• on the ceiling;
• on the floor in the room;
• portable or portable;
• inside the car.

In offices, it is best to use desktop or floor models from Dyson. They are designed for rooms where people work, and fully comply with ISO requirements. Inside the fan casing are:

• high-speed centrifugal turbine;
• electrostatic generator of ozone ions O3;
• Peltier element for heating (cooling) air;
• ultrasonic emitter for spraying water.

Bladeless fans are durable, they do not require special care and maintenance. Like all household appliances, they cannot be turned on when moisture enters the enclosure or in rooms with relative humidity above 85%. Before first switching on in a new place, you need to check the voltage in the outlet (220V). Only qualified personnel with an access group of at least IV may repair the product. Filling the inner tank with water can only be done after disconnecting the fan from the network.If the device falls from a great height, a specialist should inspect it before switching it on. This must be done even when the fan after a fall is working and there are no visible cracks and chips on the case.

To assemble the fan with your own hands, you need to have the skills of metalworking and electrical work, as well as acquire all the necessary parts in the store. For a bladeless fan you need to purchase:

• PVC pipes of various diameters;
• hacksaw;
• ruler or roulette construction;
• slate pencil or marker;

• skin "zero";
• plastic food container for food;
• knife with a sharp blade;
• insulating tape;

• perforator and drills in the kit;
• crown for woodwork;
• all-purpose adhesive;
• a piece of fiberglass for warming windows;

• electric jigsaw;
• nitro-enamel in a spray can;
• LED tape;
• 220V electric soldering iron;

• cooler box for the computer 120x120 mm;
• unshrinkable heat shrinking;
• a set of electrical wires;
• universal screwdriver with replaceable blades;

• a set of fasteners;
• locksmith scissors;
• polymer mesh for air ducts;
• heat gun electric;

• Æ3.5 mm audio jack assembly ("male" and "female");
• universal pliers;
• 220V electrical switch;
• gas bottle with a burner;

• blank for printed circuit board from getinaks;
• nichrome wire potentiometer;
• Schottky diode enclosed, chip NE555;
• capacitors, resistors, diodes;

• rubber feet for stand;
• power supply network universal.

Despite the conservatism of thinking, immediately after its appearance, flawless fans began to confidently shape their niche in the market for technology to create a comfortable microclimate in the apartment and office space. Buyers of flawless air conditioners point out as advantages:

• high performance with small dimensions;
• lack of a stream of cold air during the operation of the conditioner;
• no need for periodic maintenance;
• convenience when changing the location of the office - no need to call specialists to install and fill the system with freon;
• there is no vibration of windows and characteristic noise of the compressor during the work;
• simplicity of control - there are no handles of the compressor mode and control of the air damper;
• no need to periodically drain condensate from the pan.

About 0.1% of buyers say increased noise at work. According to experts, the noise from the turbine of a bladedless air conditioner is significantly lower than a regular computer penetrating from the street through windows or from a working system unit.

How to make a fan with your own hands, see the next video.