Fans have long been affordable and effective devices that help maintain the desired microclimate in an apartment or office. The health, well-being and performance of people in the room will depend on the pressure, temperature, relative humidity, and air flow speed of such a device.
Device structure
The most simple device For forced circulation The air in the room is a fan - an impeller with blades mounted on a motor shaft without a gearbox. All fans with open blades have a very unpleasant " side effect» – noise arising due to a sharp change in the speed and direction of the air flow on the blades. At low speeds the sound resembles the hum of a low-flying airplane, at high speeds it sounds like a whistle.
The famous English scientist James Dyson worked for a long time to create a device for indoor air convection that operates without noise and drafts. He tested Nikola Tesla's idea of accelerating air flow using high-frequency electric field 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 Dyson tried was his own. He wanted to create a fan without the main drawback - increased noise during operation, resulting from a sharp change in the speed and direction of air flow. The scientist made the fan housing, reminiscent of an airplane wing in profile, in the shape of a ring with a slit-like slot for air to escape around the circumference. A high-speed air turbine without blades, similar in design to water mill, located at the bottom of the case. It sucks air through the slots and supplies it to the second turbine high pressure, located at the top near the ring. Compressed air comes out at high speed through a narrow slot in the plastic ring.
The pressure drop as air exits through the gap, which resembles an airplane wing in profile, twists the surrounding air into a spiral. A powerful air spiral, similar to a large donut, moves forward along the axis of the ring, intensively entraining the surrounding air according to Bernoulli's law and creating a zone of turbulence around itself.
Turbine design bladeless fan protected by patent, therefore, it is not possible to describe in detail the structure of the main assembly of a bladeless fan. According to information from open sources, it is known that the fan turbine uses Air Multiplier technology. According to independent examination, the type of bladeless fan is one of the quietest and most economical. It is ISO certified.
Operating principle
The operation of the tabletop bladeless fan is based on the principle of a centrifugal air turbine. During operation, a soft air flow occurs, which comfortably cools the air in summer heat. The speed and distribution of the flow do not create drafts. Air is sucked into the device through narrow slots using a bladeless impeller mounted on the shaft of a high-speed motor without a gearbox. The design of the impeller resembles a gas turbine.
To reduce noise, the intake air passes through a Hemholtz chamber, which absorbs noise due to reverse resonance. Next, the air is supplied through a tube to a ring with a slotted hole around the perimeter, which in cross section resembles an airplane wing. At the outlet, the air forms a laminar flow, which, due to the aerodynamic profile of the slot opening, flows out at high speed, causing a pressure drop in the high-speed air flow zone.
According to Bernoulli's law, the pressure drop in the high-speed flow zone carries the surrounding air with it, increasing the mass moving at high speed by almost fifteen times. The impact of a bladeless fan on the indoor microclimate can be greatly enhanced if the reservoir in the housing is filled with water or a simple fan is placed in front of the fan in the direction of air movement. ultrasonic humidifier. The air temperature drops 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 and calcium chloride (29.9% CaCl2, 70.1% ice, t – 55°C).
Next year, Exhale Fans begins production of a ceiling model of a bladeless fan developed by Nick Heiner. The ceiling location of the fan ensures a more correct distribution of cool air along the walls with downward flows. Compared to the floor model, the innovative fan eliminates the occurrence of turbulent air flows and drafts, and also does not take up extra space on the floor.
Advantages and disadvantages
Bladeless fans, like other models, have a number of advantages and disadvantages. Advantages:
- there are no exposed moving parts, this ensures the safety of children and animals;
- do not dry out the air;
- do not require maintenance.
Flaws:
- noise during operation is about 40 decibels;
- relatively high price;
- fragile body design.
Types of bladeless fans
Table fan allows you to serve fresh air on workplace, cool powerful computer equipment, hot meals and drinks, aromatherapy at home. It can be easily carried from one place to another. The floor fan is designed to be installed on the floor. High power and air flow speed make it possible to provide comfortable conditions V separate room, office or apartment. A slight increase in noise can be eliminated by moving the device away from the person. The shape and parameters of the fan allow you to completely replace the air in the room in a few hours.
Portable fan can be used on the beach, on a camping trip, caves, desert, tent, train, car, on a yacht on the open sea. Most portable models are powered by a built-in battery or a computer USB port; more expensive ones are powered by solar panels. Their main advantages are low weight and size, energy autonomy. A special place Among the portable models are automotive bladeless fans powered by a 12V vehicle network. They are much cheaper than car air conditioners, they allow you to quickly ventilate the car interior, remove gasoline odors, diesel fuel, automotive enamel, synthetic glue and primer.
How to choose?
First of all, you need to determine Fan installation location:
- on the desktop;
- on the ceiling;
- on the floor indoors;
- portable or portable;
- inside the car.
In offices it is best to use desktop or floor models Dyson company. They are designed for areas where people work and are fully ISO compliant. Inside the fan housing are:
- high-speed centrifugal turbine;
- electrostatic generator of O3 ozone aeroions;
- Peltier element for heating (cooling) air;
- ultrasonic emitter for spraying water.
Dyson bladeless fans can serve as an adequate replacement for an air conditioner and ionizer in room volumes up to 40 cubic meters. m.
Care and maintenance
Bladeless fans are durable and do not require special care or maintenance. Like all household electrical appliances, they should not be turned on if moisture gets inside the housing or in rooms with relative humidity air above 85%. Before turning it on for the first time in a new place, you need to check the voltage in the outlet (220V). The product can only be repaired by qualified personnel with a clearance group of at least IV. Filling the internal tank with water can only be done after disconnecting the fan from the mains. If the device is dropped from high altitude, it must be inspected by a specialist before turning it on. This must be done even when the fan is working after a fall and there are no visible cracks or chips on the case.
Can I do it myself?
To assemble a fan with your own hands, you need to have plumbing and electrical installation work, and also purchase everything in the store necessary details. For a bladeless fan you need to purchase:
- PVC pipes of various diameters;
- hacksaw;
- ruler or construction tape;
- slate pencil or marker;
- “zero” skin;
- plastic food container for food;
- knife with a sharp blade;
- insulating tape;
- hammer drill and drills included;
- crown for woodworking;
- universal glue;
- a piece of fiberglass for window insulation;
- electric jigsaw;
- nitroenamel in an aerosol can;
- LED strip;
- electric soldering iron 220V;
Just recently, no one could have imagined that achievements in science would reach the limits of perfection so far. This is especially true for new products in the field household appliances. The product range is so large that the consumer does not have to be content with something ordinary. Everyone tries to choose the best modern model equipment, especially if it has an updated design.
The most popular new product on modern market A household appliance can be considered a bladeless fan. This invention not only helps to refresh the room, but is also considered an economical type of technology in terms of energy consumption. What is the operating principle of such a device?
How a bladeless fan was created
This type of device, a bladeless fan, was invented by the famous English scientist James Dyson. His goal was to invent a device that could work without blades and without any vibration. In addition, the scientist managed to develop a technology that could increase the blown air up to 15 times. The creation of a device without blades went through a very difficult path, and the technology could only be perfect after long work engineers led by Dyson. About 4 years were spent on the miracle invention. As a result of developments, innovators still managed to optimize the ventilation ring.
The operation of the fan is driven by a simple electric motor, which has a power of 40 W and is located on the bottom of the device. The motor is equipped with powerful neodymium magnets that prevent the formation of dust. The speed of air flow can be easily adjusted using a rheostat switch, which is impossible to achieve with conventional paddle devices.
Dyson managed to create safe fan without blades, which was able to displace conventional fans. After all, this type of device is very convenient and unpretentious to use.
How does a bladeless fan work?
There are many small holes on the leg of the bladeless device itself. They provide not only cooling of the device, but also filter the air itself. Such a turbine pump is capable of pumping up to 20 cubic meters of air per second, which is almost impossible for a conventional fan.
The air mass passes through the distribution ring and turns into a dense contour with the middle inside. The ring is equipped with an empty cavity and a slot through which air passes under pressure. The speed of the air leaving the ring is 90 km/h. At this speed, one air flow meets another, which creates an element of air flow compensation. This process allows you to increase the outgoing air tens of times with its uniform movement.
Bladeless fans, of course, have many advantages over conventional models fans. Their stylish design can serve as decoration for anyone modern interior both at home and in the office. Having enormous power and high safety, the device without blades It also has a reasonable price compared even to cheap air conditioner models. In addition, such a device refreshes the room well and works almost silently, which makes it simply irreplaceable.
The safety of a bladeless device is amazing. This device completely lacks moving parts in the form of blades, which allows it to be used freely even near small children. In addition, the device has amazing power, thanks to which the air is blown out more intensely and the room is cooled faster. The operation of the bladeless fan is easy to regulate using the control panel, which creates even greater comfort.
The fan without blades rotates comfortably in different sides, so the coolness spreads throughout the free space. Models of such devices have a powerful platform, which ensures their stability. Even The control panel is attached to the body to avoid its loss.
In short, bladeless fans have the following advantages Compared to conventional models of such devices:
In addition to most of the advantages, bladeless devices have some, though not quite significant flaws:
- Presence of noise and vibration. When the turbine operates silently, the release of air flow is accompanied by a strong hum.
- High cost compared to conventional blade fans.
So, bladeless fans are distinguished by their operating efficiency, modern design and practicality. That is why they are many times superior to traditional models and have already begun to enjoy a certain demand in the household appliances market.
The traditional design of a ceiling fan is well known. Usually its blades whistle through the air under the ceiling of the room, directing the air flow downward. Being directly under the fan, you can enjoy the “light breeze” and risk catching
The traditional design of a ceiling fan is well known. Usually its blades whistle through the air under the ceiling of the room, directing the air flow downward. Being directly under the fan, you can enjoy the “light breeze” and risk catching a cold at the same time. But in other places in the room the effect of the flow is practically not felt.
Inventor Nik Hiner, together with like-minded people from the company Exhale Fans, offers a product that does not have these disadvantages and has an unusual innovative design.
IN new design everything is turned upside down. No, the fan is still mounted under the ceiling of the room, but it does not have any blades whistling overhead, and it does not blow out the air flow, but draws it in.
Instead of blades, flat disks rotate, creating laminar (unidirectional) air flows moving along the surface of the ceiling and descending down to the floor along the walls of the room. As a result, air entering the fan from below circulates evenly throughout the room, mixing the temperature layers. Unlike a conventional blade fan, a room completely enveloped by laminar flow eliminates areas where the temperature deviates significantly from the average.
The design does not have rotating blades, which determines a fundamentally lower noise level during operation. In addition, a low-noise electric motor is used to rotate the circles, which practically reduces the overall noise level to a minimum. Engine DC can rotate at six different speeds, and is controlled by a wireless remote control. Of course, the undeniable advantage and difference between the new fan and its bladed counterparts is appearance, fits perfectly into almost any interior.
Hiner came up with the idea for a bladeless ceiling fan while he was studying the design of a Nikola Tesla turbine. Hiner made the first attempt to implement an unusual design in 2005. Next years went into adapting the design and producing a whole series of prototypes before the inventor settled on the current design.
Today the fan is almost ready for production. To launch it, a certain amount is required, which Hiner intends to spend on developing packaging and purchasing raw materials.
In this publication, we will look at a device called Dyson’s Air Multiplier and, despite unusual look, this is a fan that has an obvious feature - it does not have the usual blades, which, when rotating, create a flow of air directly directed at the object. In the video there is a review of it and a demonstration of how it works. This is an invention of Dyson, which specializes in the development and assembly of vacuum cleaners. The company's employees decided to create a bladeless fan, based on the principles on which their favorite creations, the vacuum cleaners mentioned above, operate.
Despite the apparent sensationalism of this useful model, the inventors were unable to completely abandon the blades. They remain in this device, but are hidden in the body, in general, like in a vacuum cleaner. The beautiful ring contains properly directed slits, and at the base of the fan there are blades that force air upward.
The nice utility of this thing is not only the futuristic design, but also the safety of the design, which has no external rotating parts. For owners of apartments and other premises where children are located, this is an important advantage. Additionally, the air flow of a bladeless fan is more uniform than its standard counterpart. The disadvantage is the hum, reminiscent of the noise of a working vacuum cleaner, weaker flow than in the paddle counterpart and high price. Figuratively speaking, the wind costs 450 rubles, and the cost is several times higher.
The main disadvantage is noise.
Discussion
And if you make a super coil in this ring, and a transformer at the bottom, then by accelerating the electrons by 4000 volts and creating a powerful twisting magnetic field, you can create the same effect. Electrons magnetic field will disperse air particles. And there won’t be as much noise if it can be heard at all outside of the flow.
This is called induction. It will only be 15 times more expensive.
It's buzzing, I think the efficiency is several times lower compared to normal fans, problems with maintenance, dust and all that. useless thing. As for safety, it seems that all fans are equipped with mesh protection. Isn't it?
It makes noise. There is a 100% impeller like that of a vacuum cleaner, just for pressure to pump this ring. Dyson or whoever invented it, handsome, hid the valve in a separate housing (he took the housing from a vacuum cleaner) and simply added a more original air duct to it. That's it, the know-how is ready. It was correctly written above, a product for a variety of “on the couch” stores. A cheap Chinese floor fan operates almost silently at speed 1 and moves 50 times more air through it.
Useless thing. Well, you can wash this ring under the tap and the dust inside won’t be sucked in? A regular fan equipped with a mesh is also safe. This fan is quite loud. I don’t see any advantages in it at all.
Damn...4500...7500 rpm is brutal, it will sound like an airplane. But thanks for the video! Otherwise, in the descriptions in online stores, some kind of garbage is written, you won’t understand anything from them, but now at least I looked - I understand.
I'll buy it when they start making silent ones and at a normal price. 1500 rpm should be the maximum. Better - 600. In principle, everything is clear: there must be a thicker column in order to fit a fan that provides the required air flow at low speeds.
So, producers, get to work!
I've seen completely silent specimens. When I came across a stream of air coming from nowhere, I was very impressed. Imagine standing in front of an incomprehensible device that shows no signs active work, but at the same time generating a pleasant air flow. I was immediately delighted. Returning home, I began surfing the Internet to understand what it was and how it worked. I remember then I immediately thought that Mr. Dyson, the practical one, had created a fundamentally new look propulsion system, which is based on the principle of air flow multiplication. And that uniform air flow, without turbulence, is very useful for such types of transport as Hoverbike, etc.
Alas, it is not an ideal fan, as it makes noise; an ideal fan should be absolutely silent. But this is a contradiction, cutting the air with blades creates a beneficial effect (air flow) and at the same time a harmful effect (noise), which means the blades must spin to create air flow and should not spin so as not to create noise. This is a physical contradiction, who will resolve this contradiction , will create the perfect fan.
Well, it’s not easy to wash it, but on the contrary, it’s very difficult. The fan is hidden in the case, and it is not easy to reach it to remove the dust particles. There will be even more dust there than in the computer's system unit. And that's all show-off. Efficiency drops when air has to be pushed through it all before it comes out. It will either be weaker than a regular fan or louder.
Try to sleep with someone working food processor in the room. After all, the fan is a blade fan, the blades are just hidden. Low-speed fans with large blades are more practical, quieter and no less safe.
Quite recently, rather strange devices have begun to appear on the market that have the functions of a regular fan, but do not have the usual blades. A standard device of this type looks like a ring mounted on a special stand. In this case, the air flow comes directly from the middle of such a ring, which seems fantastic and even magical. For many, such a fan causes bewilderment, while others consider its operation to be simply supernatural or a scam.
In fact, a fan without blades has a rather simple device, although the principle of its operation is based on latest developments in Aerodynamics and Engineering. The fact is that the ring installed on the cabinet is hollow inside, and a special hole is made along its inner perimeter. A fan without blades has a turbine inside the cabinet, which supplies air pressure inside the ring, and it exits through an opening that has such aerodynamics that its flow is directed in a certain direction, namely through the circle itself. Thus, directional masses are created, which, in turn, capture air from environment, creating a fairly powerful flow. Therefore, such a device is often called pressure."
It is worth noting that the air flow obtained with the help of such a device flows evenly, and not in portions, as when using a conventional fan, which helps to increase its efficiency and significantly improves efficiency. Therefore, such a device is very good to use as a cooling fan. Its uniform flow will keep the required area under constant air pressure, which will be much more efficient at the same energy costs.
Thanks to its design, a fan without blades allows you to produce an air volume 15 times greater than a regular one. At the same time, its air pump operates almost silently, which is also very big advantage. Many models of such devices can heat the air, allowing the device to be used as a heater, and the absence of blades makes it safe for children.
However, the most important advantage of such a fan is its uniform air flow, which can be compared to a light breeze; it makes you feel like you are on the seashore. It does not bother you with its constant noise, so using such a device is a pleasure. Also, a fan without blades does not collect dust. This has a positive effect on health and will make it possible for people suffering from allergies to use it.
Thus, bladeless fans are the latest home organization devices that are not only very efficient, but economical and safe. Moreover, the price for such air is almost the same as for an electric fan heater. This makes such a device accessible to almost everyone, and the remote control remote control allows you to enjoy a gentle air flow from anywhere in the room.
