How to make a paper cooler with your own hands. USB fan from a computer cooler. Aspects of designing a homemade fan

In the southern regions it is very hot, nothing will prevent you from acquiring such a "super powerful" portable fan.

You can take an 18-volt electric drill motor, an RC airplane propeller, and a laptop battery. 4 volts is the best option, besides it is not too noisy during operation. At 12 volts the device will be heavy duty, loud and will "rattle" (due to vibration) on the table.

Required Components
The motor and batteries are the most expensive parts. You can buy a cheap used drill with a broken battery and just use the motor. Used laptop batteries usually have 6 cells and cannot work if one cell is dead. You can buy these batteries for next to nothing and use working cells to make a powerful battery (http://www.instructables.com/id/Free-lithium-Ion-Battery-Pack).

Required Parts:

• electric drill DC motor;
• laptop battery;
• plastic fan blades;
• 1/8" plywood;
• plywood and 2x1" engine mounts;
• switch (in our case 2P2T switch for 2 speeds); - electric cable.

Checking the engine and batteries
Secure the fan motor to something solid.
You can try applying different voltages to it to adjust the desired wind strength. In our case, for a 4-volt battery, a current of 1.5A turned out to be ideal. An 8-volt battery for good power corresponds to a current of 3A.
Use 4 batteries, 4 in parallel at 4V and 2 sets of 2 batteries in parallel at 8V. So at low power they will last about 5 hours, and at high power for about 1.5 hours.
Connect the 2P2T wires with a switch to switch between series and parallel circuit.

Creating an air duct and mounting the engine
First, glue the 2x1” bars together to form a T. Measure the pieces to give the propeller about half an inch of clearance on each side.
After gluing the bars, round off their edges to give them a streamlined look.
To mount the engine, cut 2 triangles out of wood. Soak a piece of 1/8" plywood in water, then bend it and let it dry. You can cut 3 3.5" strips of wood grain perpendicular to the piece to make it easier to bend. Use the T's for the base and glue 3 pieces of plywood over it, overlapping the seams and leaving one joint. Then glue the 3 ends of the T to the duct plywood. It is important to also try on the motor mount to make sure there is sufficient clearance.
Then cut two pieces of 1/4" plywood about 4.5x1.5 to form the duct support at the top. Glue these supports to the duct and to the "T".

Glue a piece of wood to the "T" to stop the motor from sliding backwards as the motor pushes the air forward and the motor itself then pushes back.
You can use 2 zip ties to secure the motor from below.

Battery layout
Use a 6-cell laptop battery to power the fan. For a bicycle fan in motion, you need a 12V fan. As a desktop fan, 4V or 8V is more than enough.

Wires to the engine
Solder two 14 gauge wires to the motor. Insulate with tape. To prevent the wires from falling into the blades, secure them to the fan support.

Testing
Feed the motor in parallel with 2 sets of 3 combined cells. The voltage should be around 11.8V. Even the multimeter should read 3.38A. The multimeter has some resistance, so the current is actually around 4A. More than 47 watts. This is already a very powerful little fan. At 16V, this fan can already push the bike decently.

Installation of protection
The propeller rotates too fast, so you need to install protection.
Using wire cutters, cut a circle out of the large fan grille so that its radius is about half an inch larger than the duct. Wrap the wire around the duct. Then hot glue the front and back protection.

Switch installation
Install a switch. Now the fan can easily turn on and off. You can apply 2T2P switch, and get two rotation speeds.

The question is trivial. First, we recommend determining the installation location of a homemade fan. Two types of engines dominate in technology: collector (historically the first), asynchronous (invented by Nikola Tesla). The first ones are very noisy, switching sections causes a spark, the brushes rub, causing noise. An asynchronous motor with a squirrel-cage rotor is quieter, generates less interference. You can find the starter relay in the refrigerator. By adding a couple of phrases of humorous phrases, we will return the seriousness of the site. How to make a fan with your own hands, not to scare your family. Let's try to answer.

Aspects of designing a homemade fan

The device of the fan is so simple, it makes no sense to tell, paint the insides. What to consider when designing? Remember the growl of a cyclone vacuum cleaner, the volume is above 70 dB. Inside the commutator motor. More often deprived of the possibility of regulation of revolutions. Decide whether a similar sound pressure level is acceptable at the installation site of a home-made fan? Having chosen the second, we will concentrate on asynchronous motors, simple models do not require a starting winding. The power is low, the secondary EMF is induced by the stator field.

The drum of an asynchronous motor with a squirrel-cage rotor is cut with copper wires along the generatrix, at an angle to the axis. The direction of the slope determines the direction of rotation of the motor rotor. Copper conductors are not isolated from the material of the drum, the conductivity of the Olympic metal exceeds the surrounding material (silumin), the potential difference between adjacent conductors is small. Current flows through copper. There is no contact between the stator and rotor, there is nowhere for the spark to come from (the wire is covered with varnish insulation).

The noise of an induction motor is determined by two factors:

1. Alignment of the stator and rotor.
2. Bearing quality.

By correctly setting up, maintaining an asynchronous motor, you can achieve almost complete noiselessness. We recommend that you consider whether the sound pressure level is important. The case concerns a duct fan - it is allowed to use a collector motor, the requirements will be set by the location of the section.

The duct fan is placed inside the duct section, mounted, breaking the path. For maintenance, the section is removed.

Noise is losing its dominance. The sound wave is attenuated as it passes through the duct. Particularly fast is the part of the spectrum that has inconsistent dimensions relative to the width/length of the tract section. Read more textbooks on acoustic lines. The commutator motor can be used in the basement, garage, devoid of people. The neighbors of the cooperative will hear, rather be too lazy to pay attention.

What is good about a collector engine, what are we fighting for the right to use. Three disadvantages of asynchronous:

At the initial moment, the induction motor does not develop a large torque, a number of special design measures are taken. The fan doesn't matter. Most household models are equipped with asynchronous motors. In production, the number of phases is increased to three.

Search fan motor

One YouTube video suggested using a 3 volt DC motor from a hardware store. Tops the USB cable, works by rotating the blade of the laser disc. Useful invention? If you are tired of an extra port, the heat will help you survive. It's easier to take a processor cooler, power it from the system unit. A yellow wire goes to 12 volts (red to 5). The black pair is the earth. Collect from an old computer. Citizens of the Russian Federation are simply too lazy to invent, we throw curious equipment into a landfill.

Asynchronous fan motors operate without a starting capacitor ... The peculiarity of fan motors is: they go straight with the winding. A couple of tips to help get the engine:

Make a fan impeller

The question of what to make a fan from has not been resolved, the authors keep silent about the impeller. First things first, the fridge! The compressor is blown by an impeller. You will get the motor, remove it. Come in handy. As for the washing machine, put the drum on an aircraft propeller. A plastic tank is suitable to make a case. Heat the bending points with a building hair dryer.

Inspect the blender, supply an unnecessary laser disc, which has received the shape of an impeller. You can make a fan yourself using improvised materials. It does not require much power, there is no point in being too zealous, honing the details. We believe readers know how to make a fan with their own hands.

Eternal fan from the CPU cooler

We decided to please readers by telling how to make a fan. The review is far from the first, I had to dig around, looking for something worthwhile. It looks chic the idea of ​​​​creating an eternal fan that spins forever. A mail.ru user posted a design that looks attractive. Let's take a closer look, thinking along the way how to make a fan that runs forever.

You know, of course, system units work quietly (modern models). The slightest noise means: the cooler's axis has gone astray, or it's time to lubricate the aged fan. They work for hours, days add up to weeks, the system unit will last for years. Made possible by smart technology. Think about it, the noise depends on the magnitude of the friction force. Mechanical energy becomes thermal, acoustic due to the presence of roughness. CPU coolers rotate easily, it's worth blowing.

The author of the video - we apologize for the lack of a name, we justify it: the video is in English - it offers to assemble an eternal fan from an accessory. The accuracy of fitting parts is great, the blade turns easily. Costs are reduced to a minimum. The author of the video posted by the deirones channel noticed: the processor fan is powered by direct current. He climbed inside, found four coils, equally spaced around the circumference, with their axes directed towards the center of the device.

There are no commutators inside, which means a paradoxical fact: the field of the coils is constant.

If the asynchronous motor of a typical fan is powered by 220 volts alternating voltage, which creates a rotating magnetic field, in our case the picture is constant. One could say: inside the rotor sets in motion a commutator that creates the desired distribution. Not true, is confirmed by the further course of thought of the author, the result of experience. A Western innovator decides to replace the coil with a permanent magnet. Indeed, there is no alternating field - why electric current?

Defiantly, the author cuts off the power wire, places neodymium (hard disk) magnets around the perimeter of the frame. Each on the continuation of the axis of the coil. The work is finished, the blades cheerfully began to rotate. We believe that a principle that is hushed up in orthodox literature is simply used. Trade secret of the patent owner.

The initial movement of the blade is obtained by random fluctuations in the air. It resembles a magnetron, the buildup of oscillations is caused by the natural chaotic movement of elementary particles. The question arose as to what determines the direction of rotation. The design is absolutely symmetrical. We decided to figure it out, we express our observations:

Agree, it is more convenient than to stir up USB ports, constantly wasting batteries. The perpetual fan works from an arbitrary position, it is devoid of wires. We believe that the strength of the magnets plays a decisive role. The simple rule stops working: more is better. The golden mean is slipping. When the blades spin from a random flow of air, overcoming a field of neodymium pieces. Weak magnets are surely powerless to keep a steady rotation. The field strength must be exactly as produced by the coils when subjected to a voltage of +5 or +12 volts.

Correctly create an eternal fan

We discussed how to make a fan, we will measure the direction, the strength of the magnetic field of the coils. Use special devices. Magnetometer, teslameter, formed by magnetic induction converter, measuring module. When the fields interact, the resulting picture is obtained, which is called cohesion. The converter generates an EMF. The size determines the measured strength of the magnetic field. Like two fingers! It costs 10,000 rubles.

The magnets will be located at a considerable distance from the axis. The coils are much closer. You need to know how the picture changes with distance. According to Coulomb's law, the force falls in inverse proportion to the square of the distance, which is true for single charges of an arbitrary sign. Separate magnetic poles in nature have not yet been found (it is not possible to create), the cube of distance is introduced into the law. Let's say the distance to the coil from the axis is 1 cm, the diagonal perimeter is 10. This means that neodymium should be 10 x 10 x 10 = 1000 times stronger than a small coil.

No one obliges to place neodymium magnets on the diagonals of the fan perimeter. The poles lie crosswise. Regulate the strength of the impact over a wide range. By placing neodymium magnets in the center of the sides of the fan frame, we significantly increase the field strength. Let's do the calculation. Let's say the hypotenuse of a triangle with a side of 10 cm is a diagonal. The distance to the center of the square will be 10 / √2 = 7 cm. You see, the ratio drops from 1000, reaching 7 x 7 x 7 = 343. It is weighty, desperate to find strong neodymium magnets to create an eternal fan.

Let's measure strength! A compass is suitable (there are custom designs that are assembled by hand, for example, http://polyus.clan.su/index/indikatory_magnitnogo_polja_svoimi_rukami/0-52). One coil should be connected to the power supply. Then find the position, the raised arrow will deviate by about 45 degrees (if you don’t like it, take any other azimuth). Then start experimenting with neodymium. Place the piece at different distances, making sure that the deflection of the arrow matches the one obtained when using the processor fan coil. Surely the distance is not equal to the diagonal, half of the side, neodymium will have to be broken, cut.

Sawing one edge along the length, we carefully break the parts on the nail, getting the desired field strength to create an eternal fan. We assume that the induction is distributed in proportion to the volume. Today they told intelligibly how to make a fan with your own hands!

Source of power

Those who want to make a fan with their own hands see 3 problems: get the engine, power, make a propeller. The parts must fit together. Three problems are solved, you start making a fan with your own hands. Today at home, an abundance of switching power supplies. Think it started in the 90s. Game consoles, mobile phones, other equipment. The equipment breaks down, switching power supplies remain. The voltage is sometimes non-standard, most motors work on any voltage. The RPM will just fluctuate with the voltage. Broken household appliances were lying around at home - immediately make a fan yourself.

Homemade fan power supplies

People are constantly trying to make a special fan with their own hands. One issue is more often left out of the discussion: the power supply. The device of the fan itself is so obvious that it makes no sense to dwell on it in more detail. So, it’s clear that there are an unthinkable amount of batteries today. Can they work for a long time? The answer is no. As a last resort, take the "crown", in Soviet times they were considered a reliable source of energy. The power supply is bad, the power will gradually decrease, the speed will decrease, and the person will be annoyed. Stability without additional effort is important. A small 12 volt battery is missing - get ready: let's start looking for how to make a homemade fan power source.

The first thing that comes to mind is to screw up the computer. It is known that miniature devices are powered by a USB port. Gadgets are recharged. The USB port is a source of inexhaustible energy. The voltage is low, you need a low voltage DC motor. We believe you can find at home, buy in a hardware store. How much will the power of the port: according to the old standards 2-3 watts. Another thing is to find a host device with an updated version of the interface (2014 was recognized as a rarity). The developers promised to give out 50 watts (even more, it's hard to believe). True, there will be more wires, nominal voltages will increase. We remind, according to tradition, power is supplied to the red (+), black (-) wires. White, green - signal.

It is clear that it is difficult to expect high power - even if the port supports it, the motor will not pull. It is recommended to look at the voltage more. The motor must be supplied with a higher voltage. For example, it is recommended to use a CPU cooler. The supply voltage is less than the prescribed 12 volts, the rotation speed will simply decrease. Beware of exceeding - the motor may burn out.

We are looking for energy, the issue is easier to solve than for 3 volts:

12 volt power supply for a do-it-yourself fan

We suggest not to assemble a switching power supply, to make a regular one with your own hands. Recall that the first ones are distinguished by small transformers. Therefore, the power supply will be relatively large in size. It will consist of the following parts:

• A step-down transformer. We will not name the number of turns in advance, the voltage is unknown, having straightened it with diodes, we get 12 volts. Of course, you can experiment, like a YouTube video about homemade radios, capturing the reader, we will look for a ready-made solution.
• The full-wave bridge, adding three to one diode, we increase the efficiency. Radio components are not very expensive.
• The backbone of the power supply is ready for a home-made fan to serve for a long time, we will straighten the network ripple. After the bridge, turn on the low-pass filter, redraw the circuit from the Internet.

The output is a constant voltage with an amplitude of 12 volts. Try not to mix up the terminals. Where the "plus" is, where the "minus" comes out can be understood by examining the diagram. Below is a drawing of the bridge, see, read the explanations. In radio electronics, the direction of the current is indicated opposite to the true one. Charges flow, according to beliefs, in the direction from plus to minus (towards electrons). Reading the circuit, you will see: for a diode, a transistor, the emitter marked with an arrow looks wrong. In the direction of positive charges. Each has marks, on the diagram it is indicated by a huge triangle arrow. Therefore, we always find out, “plus”, guided by the graphic symbols given in the drawing.

The figure shows: the plus will be on the right, it is transmitted according to the arrow of the diode to the lower output terminal. The minus will go up. With an alternating voltage (roughly speaking), plus, minus will alternate from left to right, the name of the rectifier will become clear - full-wave. Works on the positive part of the voltage and the negative. Diodes take power, low-frequency. Solid size, power dissipation is relatively large. You can calculate using a simple formula taken from a physics course. We multiply the resistance of an open p-n junction (leafing through the reference book) by the current consumed by the motor, taking the margin at least 2 times. The body of the motor contains an inscription indicating the power, can be divided by a voltage of 12 volts, simply multiply by 2 - 3, take a diode with equivalent dissipation power (see reference book).

Now let's calculate the transformer ... We went here http://radiolodka.ru/programmy/radiolyubitelskie/kalkulyatory-radiolyubitelya/, we chose the Trans50 program, we will master it. Note that among the software there is one that allows you to calculate the filter parameters. Do you regret that you were going to make a fan with your own hands? They offer to choose one of 5 windings. Steel is everywhere. You can do without, the losses will be great. Steel forms a magnetic circuit, energy goes to the secondary winding. It is better to find an old rusty transformer. The time is bad, in the hungry 90s, landfills are littered with plates of windings handed over for scrap. There were no problems with winding transformers.

It's time to understand how much voltage is required for the correct operation of the circuit. A term borrowed from electronics, effective AC voltage, will help. Voltage, on the active resistance, creating a thermal effect equal to the constant voltage of the effective amplitude. To obtain the required voltage value on the secondary winding, you need to divide 12 volts by 0.707 (one divided by the square root of 2). The authors received 17 volts. Engineering calculation sins with an error of 30%, let's take a small margin (part of the amplitude up to 1 volt will be lost on the diodes).

As for the secondary winding current (required for calculation), type something like “cooler power” in the search engine. Let's do it with the readers. Clever articles write: the current consumption of the cooler is indicated on the case. There will be a necessary parameter, we will substitute in the calculator. The voltage of the secondary winding, the author took 19 volts. The voltage drop across the p-n junctions of powerful silicon diodes is 0.5 - 0.7 volts. Therefore, an appropriate reserve is needed. Smart heads searched, concluded that the processor cooler does not consume more than 5 W, therefore, the current is 5 divided by 12 \u003d 0.417 A. We substitute the numbers for the downloaded calculator, for the tape core we get the design parameters of the transformer:

1. Cross-sections of the magnetic circuit for winding 25 x 32 mm.
2. The window in the magnetic core is 25 x 40 mm.
3. The magnetic circuit is finished with a frame for winding wire 1 mm thick and with a cross section of 27 x 34 mm.
4. The wire is wound along the larger side of the window, leaving a margin of 1 mm from the edges, a total of 38 mm.

The primary winding is formed by 1032 turns with a diameter of 0.43 mm. The approximate length of the wire is 142 meters, the total resistance is 17.15 ohms. The secondary winding consists of 105 turns of a copper conductor with varnish insulation with a diameter of 0.6 mm (length 16.5 meters, resistance 1 ohm). Now readers understand: the question of what to make a fan is starting to be solved with a core ...

How effective are the proposed technical solutions? Fans are known to Ancient Egypt. The video of Michael Jackson, recommending “remember the time” (Remember the time) testifies. The plot was hardly prepared without the advice of archaeologists and historians. We want to report that in Mexico, most ladies use fans. The Spaniards know how to deal with the heat, the country lies on the equator. Think...

The fan is not a complex device. It consists of a motor, blades, various adjustment buttons and a stand-case. There are additional elements, such as backlight, clock, but these are already options that are not so important.

It is not at all necessary to buy a fan, because it is quite possible to make it yourself. Moreover, this does not require special skills of the master.

With the proper skill, a home-made model will turn out not to be a way to get rid of old things, but an opportunity to show imagination and, possibly, hidden talents. Some craftsmen quite simply get both functional and extremely attractive options. They harmoniously complement the interior and become the center of attention no worse than any art object.

How to make a fan from a conventional electric motor

Probably the easiest and fastest way to get your own homemade fan assembly is to find a regular motor, which is most often found in toys.

Standard electric motor from a toy

Ordering such a thing is not difficult. Moreover, today, without stopping for a minute, caravans of various knick-knacks from the Celestial Empire ply. And if not, then it’s enough to buy an inexpensive toy car and remove the motor from it.

But expect the impossible from such a device is definitely not worth it. Rather, it can only slightly drive air. But for a desktop model it will do. He will be able to blow the face of the person sitting at the computer.

For such a fan, you can use absolutely anything. The main parts will be:

• blades;
• motor;
• on/off button;
• stand;
• supply system.

Otherwise, the limit of the idea will be only within the boundaries of fantasy.

After the motor is ready for use, it makes sense to take care of the power. These can be batteries, as in the toy for which the motor was intended. But, of course, such energy will not last long. However, there is a plus - the device will remain compact and mobile.

The second option is mains power. But in this case, don't overdo it. Direct connection through the plug is a sure way to burn out the motor. So do not experiment, trying to spin the engine up to high speeds. On toys, electric motors are usually designed for 3-4.5 Volts, and the desire to give more rotation due to powerful energy sources, firstly, will quickly land the source (if it is a battery), and secondly, it will seriously reduce the life of the fan up to breakage. The motor will start to heat up, the brushes may melt.

But modern chargers convert the voltage in the network, reducing it to the specified parameters. You can find a power supply, including on sale, which is ideal for the motor.

To create the blades, you can already take any material. The main thing is that it should be light. Due to the weakness of the motor, the less the blades weigh, the faster the rotations will be, and, therefore, the efficiency of the work.

• The easiest option is to take a cork from an ordinary plastic bottle, which will serve as a fastener for the blades. Make a hole in the bottle according to the size of the rotating axis of the electric motor.
• Blades can be made from a regular CD. A hole is burned in the center according to the size of the cork from the bottle. The circumference of the disk is divided into 8 sectors. They are cut for some distance, but not to the center. After that, the disk must be heated with fire in order to easily bend the blades. For this, a lighter is suitable.

Creating Blades on CD

• You can attach the disc to the cork with glue. The second option - when a hole is burned in the middle for the cork - immediately connect the structure. The melted plastic will harden and hold firmly.
• After all this, the structure is interconnected. Wire is suitable for the stand. This is perhaps the easiest option. And for such a light device, you can’t imagine better. You can bend the skeleton in such a way as to discreetly hide the batteries there. Or carefully run the power supply wire going to the motor.
• The circuit should not always be closed if batteries are used, so a button must be fixed on the case. She is inexpensive. You can use it from the toy from which the motor was removed.

Another version of the propeller device is the use of paper, only thick. The method is even simpler, but less practical.

Advice! When experimenting, remember that the larger the fan blade area, the more noisy it will be. On the other hand, small blades do not move air as efficiently.

How to make a paper fan

Paper is not the best material for a home fan for the simple reason that it is very impractical. Any ingress of water, even banal humidity - and the device will rapidly begin to lose its rigidity.

But even despite all the disadvantages, craftsmen even make quite nice samples from paper. Of course, we are talking about thick paper or cardboard. Strong material from boxes is good. A regular motor or cooler, an on / off button and wires are also useful.

The simplest table fan using cardboard

An approximate design plan is that the device can be simplified as much as possible. The impeller is easy to cut and can have many or few blades. All at the request of the master. The motor can be mounted on a wooden or cardboard bar. The stand will also go from paper or an old computer disk.

It is only important not to forget that such a fan turns out to be very light, which makes it shaky in operation. Therefore, it is necessary to further strengthen the body. Old batteries, bolts or nuts are good.

How to make a plastic bottle fan

Crazy Hands' favorite raw material - plastic bottles - are almost perfect for creating your own fan. For a propeller, the top of a standard round bottle works well. It is necessary to cut off the part with the cork just above the glued label.

• The part of the bottle with the cork will be the blades. To do this, the plastic before the cork needs to be cut so that several different petals are obtained. After one, the petals are cut off at the base. The rest are the future propeller blades.

Plastic bottle fan blades

• To shape the blades and twist them a little, you can use a candle or a lighter. The main thing is not to overdo it, because the plastic is soft and can catch fire. The task is to warm it up a little, and not set it on fire.
• The cork will be the base of the propeller. A hole is made in it according to the dimensions of the axis of the motor. To keep the connection firmly, you can put it on glue.
• Now is the time to think about the foundation. The rest of the plastic bottle is also suitable for it. A hole is cut in it to firmly place the cork with the blades at a right angle. It is necessary not to forget to weight the base - with nuts, bolts or any other metal objects.
• A hole is made on the base for the button and the chain is assembled. There is also enough space for the power supply.

The field for imagination when working with a plastic bottle is extensive. You can use several bottles at once. One will become a propeller (more precisely, part of it), and the second will become a good base. But then additional materials will be needed. For example, regular drinking straws.

Simple and lightweight bottle fan

How to make a usb fan

But the most convenient and simplest fan is exactly the old cooler, which can also be used. For example, put it on the table, and it will cool, only not the processor or video card, but the person.

The advantages of this design are obvious: the cooler is very reliable, because it is his job to constantly turn the impeller and cool something. Yes, and getting coolers is easy. It is enough to either find an old computer, or order a new fan or buy it in a store.

The cooler device is simple. This is a ready-made fan in a plastic case. Two wires (usually red and black) depart from it.

Regular computer cooler

Making a USB fan is a matter of minutes:

1. The wires on the cooler are stripped by 1-2 centimeters.
2. A regular USB cable is taken, at the end of which you also need to get rid of the insulation. The standard USB cord has four wires inside. Of these, you should choose black and red. Cut off the rest so as not to interfere, and clean up the necessary ones.
3. Connect the red wire of the cord to the red one on the cooler. Black - with black. Carefully insulate areas without winding. Ready.
4. It remains only to think about the holding device. Here the already familiar wire, which takes any shape, can come in handy. Even a cardboard box will do for the fan case, and if you spend a little more time and effort, you can even build a real design object.

Design approach to the design of the fan

It is very convenient when the fan turns on when you start the computer. In addition, modern blocks have several USB outputs at once. It turns out that such a device will not interfere.

Another point - sometimes you want to turn on the fan regardless of the computer's operation (especially since a device with a cooler turns out to be quite powerful, good and useful). Then you can use adapters. For example, phones today make chargers that easily turn into a USB cord when the plug is disconnected. Similar equipment can also be used for a fan, making it universal: powered from the network and from the USB port of any computer. Another plus of this design is the simplest electrical circuit. A cooler-based fan can even do without extra buttons: just a wire and a plug.

DIY bladeless fan

But a slightly uncommon use of a free cooler (but you can get by with an electric motor) is a bladeless fan. Modern, interesting, with due skill - no less effective - a solution that definitely attracts the eye. The thing turns out to be completely non-standard, spectacular.

For example, here is the ideal appearance of a bladeless or ducted fan model:

This is how you can make a bladeless fan with your own hands

The most important thing about bladeless models is, of course, their appearance. Therefore, if you make such a device yourself, then you need to try to think through the frame in great detail. Rough edges, roughness - all this will spoil the impression.

The case of a bladeless fan is almost entirely a working area. Do not think that some space technologies are implemented here.

Air circulation is carried out quite prosaically - with the help of rotating blades. They hide in a tuba base. If you take a cooler from a computer, then you can make a stand according to its shape. Here, as they say, at the discretion of the author.

The differences from the classics are in the location of the cooler - it is placed horizontally in a bladeless fan.

Location of the cooler in a bladeless fan

The upper ring is made hollow inside, two-layer. There, the main redirection of air in the right direction is carried out.

A hollow cavity is visible in the upper ring of the fan, from where air blows

You can make the frame of a bladeless fan out of plastic, wood, thick cardboard. It is better to use a flexible material so that it can be easily shaped into a ring. Alternatively, use a combined structure. For example, rings are made of cardboard or plastic, and the frame is rigid - made of wood.

You need to cut out:

• four faces for the stand;
• Two circles of the same radius;
• Twist two rings of different diameters.

Then everything is connected together, if necessary - painted.

Meals can be organized in different ways. A universal option - a combined cable for a USB connector and a plug-in plug for an outlet.

The device can also be slightly complicated. For example, make a light strip from a diode tape along the edge of the rim. The backlight consumes little energy, but it will add beauty to the fan. And the power supply and wiring, if necessary, can be easily hidden in the stand.

How to make a powerful fan with your own hands

When it comes to powerful fans, you need to understand that they require completely different motors. Starting from the motors of old fans, ending with other household appliances. Well suited:

• unnecessary ceiling chandeliers with a fan;
• old lawn mowers;
• drills;
• hoods.

The only thing you need to get into the voltage corridor, which is required to power the motor. For example, drills most often need 18 volts. But for ventilation purposes, it will be sufficient to supply less than half of this voltage. Even at 12 volts, the fans are very loud and extremely unstable due to the strong inertia of the rotating blades.

Power for powerful electric motors must be done from the network. Therefore, you need to think about installing a power supply or connecting a charger. The wiring diagram can be complicated by adding light bulbs, an electronic clock, a radio, a toggle switch or a board for switching operating modes. But it's easier, of course, to limit yourself to only a fan with a button, if that's enough.

In any case, such homemade variations of homemade fans are sometimes much better than even purchased options. With proper skill, a very good thing can turn out, the real pride of the owner.

Summer has come, which means heat, heat and an eternal lack of coolness. But this problem is fixable, and pretty easy. You only need a few details and some free time to make your life easier with your own hands, fill it with light coolness, which you will certainly get by making a USB fan at home. Of course, you can go and buy a fan in the store, but how nice it will be to sit near the same computer, and a light breeze will blow on you from the USB fan you created. And a thing created by one's own hands always pleases not only the eye, but also develops selfishness.

We offer you to watch a homemade video - usb fan:

Tools for usb fan:
- Regular CD (not necessarily new);
- A tube of silicone glue is empty;
- Wooden block;
- Mini disk;
- USB cable;
- Motor;
- Holder;
- Adapter;
- Silicone glue gun.

Three holes must be made in the tube, one in the lid, and two on the sides. Holes are easy to make using a regular nail, which must first be heated.

It is also necessary to make a slot or recess in a wooden block. This can be done easily with sandpaper.

The mini disk easily turns into a propeller. To do this, it must be drawn into uniform blades, then heated with a clerical knife and cut along pre-drawn lines. And after that, we heat the base of each blade with a lighter and with the help of our hands we bend each blade a little to make a propeller.

We take the motor, holder and adapter from a non-working CD drive.

Now let's start assembling the USB fan.

Heat up the glue gun. Lubricate the holder along the axis with silicone glue from a glue gun. The propeller must be firmly planted on this glue. Press on all sides. Then, on the other side of the holder, we drip a drop of glue and glue the adapter. We are waiting for the glue to dry well. This usually only takes a couple of minutes.

Now we take a tube of silicone glue, remove the lid and grease the inside with silicone glue. And inside we insert the motor so that the part that we will connect sticks out of the hole that we originally made.

Then we put the USB cable into the side hole of the glue tube and connect the ends of the wires to the motor.

It is necessary to pour silicone glue into the recess in the wooden bar, and put the wire from the USB cable tightly there, and glue the tube with the motor inside to the base of the bar. And on the other side of the bar, glue the CD on silicone glue.

Now the propeller must be mounted on the side of the adapter glued to it on the sharp edge of the motor, which sticks out of the hole in the glue tube.

And finally, our USB fan can be plugged in and get that long-awaited coolness.

Creating a high density airflow is possible in several ways. One of the effective ones is a radial fan or "snail". It differs from others not only in form, but also in the principle of operation.

The device and design of the fan

For the movement of air, sometimes the impeller and the power unit are not enough. In conditions of limited space, a special type of design of exhaust equipment should be used. It attaches a spiral body that performs the function of an air channel. You can make it yourself or purchase a ready-made model.

For flow formation, a radial impeller is provided in the design. It is connected to the power unit. The blades of the wheel have a curved shape and create a discharged area when moving. It receives air (or gas) from the inlet pipe. When advancing along the spiral body, the speed at the outlet increases.

Depending on the application, the centrifugal volute fan can be general purpose, heat resistant or corrosion protected. It is also necessary to take into account the magnitude of the generated air flow:

• low pressure. Scope - production shops, household appliances. The air temperature should not exceed +80°С. Mandatory absence of aggressive environments;
• average pressure value. It is part of the extraction equipment for removing or transporting small fraction materials, grain sawdust;
• high pressure. Forms an air flow into the fuel combustion zone. It is installed in boilers of many types.

The direction of movement of the blades is determined by the design, and, in particular, the location of the outlet pipe. If it is located on the left side, the rotor should spin clockwise. The number of blades and their curvature are also taken into account.

For powerful models, you need to make a reliable base with fixing the case with your own hands. The industrial installation will vibrate strongly, which may lead to its gradual destruction.

Self-manufacturing

First of all, you should decide on the functional purpose of the centrifugal fan. If it is necessary to ventilate a certain part of the room or equipment, the case can be made from improvised materials. To complete the boiler, you will need to use heat-resistant steel or make it from stainless steel sheets with your own hands.

First, the power is calculated and a set of components is determined. The best option would be to dismantle the snail from old equipment - a hood or a vacuum cleaner. The advantage of this manufacturing method is the exact match between the power of the power unit and the parameters of the hull. A snail fan is easily made by hand only for some applied purposes in a small home workshop. In other cases, it is recommended to purchase a ready-made model of an industrial type or take an old one from a car.

The procedure for making a centrifugal fan with your own hands.

1. Calculation of overall dimensions. If the device will be mounted in a limited space, special damper pads are provided to compensate for vibration.
2. Case manufacturing. In the absence of a ready-made structure, you can use sheets of plastic, steel or plywood. In the latter case, special attention is paid to sealing the joints.
3. Scheme of installation of the power unit. It rotates the blades, so you should choose the type of drive. For small structures, a shaft is used that connects the motor gearbox to the rotor. In powerful installations, a belt-type drive is used.
4. Fasteners. If the fan is installed on an external case, for example, a boiler, mounting U-shaped plates are made. With significant capacities, it will be necessary to make a reliable and massive base.

This is a general scheme by which you can make an exhaust functional centrifugal unit with your own hands. It may change depending on the availability of accessories. It is important to comply with the requirements for sealing the housing, as well as to ensure reliable protection of the power unit from possible clogging with dust and debris.

The fan will make a lot of noise during operation. It will be problematic to reduce this, since it is almost impossible to compensate for the vibration of the case during the movement of air flows with your own hands. This is especially true for models made of metal and plastic. The tree can partially reduce the sound background, but at the same time it has a short service life.

In the video you can see the process of manufacturing a case from PVC sheets:

Overview and comparison of production ready models

When considering a radial snail fan, it is necessary to take into account the material of manufacture: cast aluminum housing, sheet or stainless steel. A model is selected based on specific needs, let's consider an example of serial models in a molded case.