Throughout the long winter, we look forward to pleasant summer days, and with the onset of hot weather, for some reason we begin to dream of coolness. How delightfully a light breeze created by a small homemade fan. Plus, making it is incredibly fun, right?
We invite you to familiarize yourself with step by step instructions on assembling protozoa efficient devices from literally waste raw materials. The article presented to your attention describes in detail how to make a fan with your own hands and what a home craftsman will need for this.
At your disposal is a detailed description of the manufacture of options, the effects of which have been tested in practice. You can make such devices yourself without having any experience at all. For a complete understanding of the information, attached step by step photos and video instructions.
The simplest fan can be made from CD discs. It can be used, for example, to locally influence a user who for a long time spends time at the computer.
Let's prepare the raw materials to complete the work:
- CD discs – 2 pcs.;
- low-power motor;
- wine bottle cork;
- cable with USB plug;
- a tube or rectangle made of thick cardboard;
- soldering iron;
- candle or lighter, hot glue;
- pencil, ruler, squared paper.
For our purposes, you can use a motor from an old toy, for example, from a toy car. As cardboard tube A toilet paper roll slightly decorated with decorative finishing paper will do.
The main advantage of this model is that almost any do-it-yourselfer will have all the materials needed for its manufacture.
The assembly process of the mini fan is quite simple.
Let's take one of the CDs and use a marker to divide its surface into eight equal sections. The easiest way to do this is to use a sheet of checkered paper.
Draw a cross on it from a horizontal and vertical line. We divide each of the four resulting right angles in half. Using cells, this is not difficult to do.
Using a very simple method using a checkered piece of paper, we can achieve the ideal layout of the disk into eight equal sectors
We place a disk on our drawing so that the intersecting lines are in the very center of its hole. Alternately applying a ruler to the lines diverging from the center, we make markings on the disk. This way the sections will be the same.
To divide the disk into blades, follow the marking lines with a soldering iron from the transparent part to the edge.
You can also use scissors for cutting, but there is a danger that the workpiece will crack during the process. If you don’t have a soldering iron, you need to use a knife preheated on the stove. When working with a soldering iron, deposited plastic is formed along the edges of the cut, which can be easily removed with a knife.
Cutting a disk with a soldering iron is the most effective method, in which the workpiece will not crack or deform, and the remnants of the deposited plastic can be easily removed with a knife
We heat the surface of the disk over the flame of a burning candle so that the blades can be slightly expanded. If you don't have a candle, a lighter or a soldering iron will do.
The central part of the disk should be heated, and all blades should be turned in the same direction. Place in the disc hole wine cork. To fix it better, you need to pre-treat the edges of the hole with hot glue.
The USB cable must be connected to the motor. If we don’t guess the direction of rotation of the propeller, we can swap the reins, that is, change the polarity.
The motor needs to be glued to a cardboard tube, and the tube itself to a second CD, which will act as the base of the stand.
When the plug is installed in the hole, the stand from the second CD and cardboard tube, as well as the connecting device are already assembled, it is very important to correctly fit the propeller onto the motor shaft
Now the propeller needs to be “planted” on the rod of the future fan. We will try to make sure that it is installed strictly in the center. You can secure it in this position using hot glue.
After all work is completed, the fan is ready for use.
Although the construction of this device will not take you much time, the result of the work performed will undoubtedly please you
How to make something similar, but a little more complex design Having included a regulator in the circuit, look at the video posted at the end of this article.
Do you find these homemade instructions complicated? Then you may be interested in information about and rules for choosing them in order to purchase a ready-made device offered by household appliance manufacturers.
Fan based on a plastic bottle
What our craftsmen don’t do from plastic bottles! The time has come to say that they also make a very good fan. It may not ventilate your entire room, but it will definitely help those who have to work at a computer.
We offer two options for creating such a fan model.
Option #1 – hard plastic model
To complete the work we will need:
- plastic bottle with a capacity of 1.5 liters;
- a motor from an old toy;
- small switch;
- Duracell battery;
- marker;
- scissors;
- candle;
- hammer and nail;
- Styrofoam;
- hot glue gun.
So, let's take the ordinary one plastic bottle 1.5 liters with plug. At the level of the label line, cut off its upper part. This is exactly what we need to make the propeller. We divide the surface of the plastic blank into six parts.
We try to mark it out so that we get equal sectors: the quality of operation of the future device depends on this.
We cut the workpiece along the markings almost to the neck. We bend the blades of the future propeller and cut off every second of them. We are left with a blank with three blades equidistant from each other. The edges of each blade must be rounded. We do this carefully.
To remove those parts of the blades that are closer to the neck of the workpiece, it is better to use a utility knife; do not forget to round the edges of the blades
Now we will need a small candle. Let's light it up. We heat each blade at the base on it to turn it in the direction we need. All blades must be turned in the same direction. Remove the lid from the workpiece and punch a hole in the very center using a nail and hammer.
We place the plug on the rod of a small motor. Such motors can remain from old children's toys. As a rule, getting them is not difficult. Secure the cork with glue.
Now you need to make a base on which the motor will rest. For this purpose, we take, for example, a piece of polystyrene foam. We attach a rectangle to it, which can also be cut out of foam packaging.
Our motor, to which the propeller is attached, will be fixed on the upper surface of this rectangle. To do this, you need to make a recess in the foam that corresponds to the parameters of the motor.
Hot melt adhesive is used to secure the elements of the product. If it is unavailable, other adhesives can be used. It is important that the fastening itself is as reliable as possible.
Very often, in the sultry heat, there is not enough air flow in the room. To solve this problem, many people buy table fans; they are convenient and compact, some of them work from USB, that is, they can be connected to any charger, power bank or laptop, so that the coolness is always with you. But why buy something that you can make yourself using available materials? For site readers we have prepared two simple instructions who will clearly explain how to do USB fan at home with your own hands. So, all you need to prepare is a sharp knife, good scissors, electrical tape, an unnecessary USB cord and, in fact, a homemade executive body. As for the latter, it is customary to use one of two options: an old cooler from a computer or a motor from a car or other toy.
Idea No. 1 – Use a cooler
It will take no more than 15 minutes to assemble a USB fan from a cooler. First you need to prepare the cooler. Two wires come out of the device - black and red, and sometimes yellow, even less often - blue. Yellow and blue are of no use to us. We strip the insulation by 10 mm and put the prepared element aside.
Next you need to prepare the USB cable. We cut off one half of it and clean off the insulation at the cut point. sharp knife, stationery is perfect. Under it you will see four wires, of which two are necessary: red and black. We also clean them, but it is better to cut off the other two (usually green and white) and insulate them. 
Now, as you understand, you need to connect the prepared contacts in pairs, according to: red to red, black to black using twisting. After this, you need to carefully insulate the cable connections using electrical tape or heat shrink and make a stand. As for the stand, it’s up to your imagination. Some people successfully use wire, while others cut out a nest in a cardboard box in a very interesting way.
In the end, a homemade mini fan is connected to a computer or charging unit, and you can enjoy the operation of your own electrical appliance.
Cooler idea
Idea No. 2 – Use a motor
In order to make a USB fan from a motor and a CD, it will take a little more time, but you can still easily make such an electrical device with your own hands in an hour. A motor for such a homemade product should be chosen with an operating voltage of approximately 5 Volts, maybe a little more. If you take the motor to a lower voltage, too much current will flow through the circuit and the motor will quickly fail. 
First, we prepare all the elements of the device. In this case, you will need to make an impeller (blades). 
To do this, we recommend using an ordinary CD. We draw it into 8 equal parts and carefully cut it with good scissors, almost reaching the center. Next, we warm up the disk (it’s convenient to do this with a lighter), and when the plastic becomes more elastic, we bend the blades under equal angle(as shown in the photo).
If the impeller is not bent enough, then no air flow will be created during the rotation of the disk. However, if you overdo it, the homemade product will also work poorly and unstable.
When the blades are ready, move on to creating the main mechanism. Inside the disk you need to insert an ordinary one, cut to the right size, a champagne cork that needs to be placed on the motor shaft. Next, we move on to creating a USB fan stand for a laptop. 
Here, as in the previous version, everything depends on your imagination. Of all the available means, the option with wire is the most suitable. When homemade USB the fan is ready, we connect the motor wires to the USB cord wires, as in the previous version, carefully isolate the twist and proceed to testing.
Creating air flow with high density possible in several ways. One of the effective ones is a radial type fan or “snail”. It differs from others not only in shape, but also in its operating principle.
Fan device and design
Sometimes an impeller and a power unit are not enough to move air. In conditions of limited space should be used special kind design of exhaust equipment. It has a spiral-shaped body that acts as an air channel. You can make it yourself or purchase a ready-made model.
To form the flow, the design includes a radial impeller. It connects to the power unit. The wheel blades have a curved shape and create a discharged area when moving. Air (or gas) enters it from the inlet pipe. When moving along the spiral body, the speed at the outlet increases.
Depending on the application, the centrifugal fan volute can be general purpose, heat-resistant or corrosion-resistant. It is also necessary to take into account the amount of air flow created:
- low pressure. Area of application: production workshops, household appliances. The air temperature should not exceed +80°C. Mandatory absence of aggressive environments;
- average pressure value. It is part of exhaust equipment for removing or transporting small fraction materials, sawdust, grain;
- high pressure. Forms an air flow into the fuel combustion zone. Installed in many types of boilers.
The direction of movement of the blades is determined by the design, and, in particular, by the location of the outlet pipe. If it is located on the left side, the rotor should rotate clockwise. The number of blades and their curvature are also taken into account.
For powerful models, you need to make a reliable base with your own hands to secure the body. The industrial installation will vibrate strongly, which may lead to its gradual destruction.
Self-production
First of all, you need to decide functional purpose centrifugal fan. If it is necessary for ventilation of a certain part of the room or equipment, the housing can be made from scrap materials. To complete the boiler, you will need to use heat-resistant steel or make it from stainless steel sheets yourself.
First, the power is calculated and the set of components is determined. The best option The snail will be dismantled from old equipment - an extractor hood or a vacuum cleaner. The advantage of this manufacturing method is the exact match between the power of the power unit and the body parameters. A snail fan can be easily made with your own hands only for some applied purposes in a small home workshop. In other cases, it is recommended to purchase a ready-made industrial-type model or take an old one from a car.
Procedure to make a centrifugal fan with your own hands.
- Calculation overall dimensions. If the device will be mounted in limited space– provide special damper pads to compensate for vibration.
- Manufacturing of the body. If there is no ready-made structure, you can use plastic sheets, steel or plywood. In the latter case Special attention is given to sealing joints.
- Installation diagram of the power unit. It rotates the blades, so you need to choose the type of drive. For small designs, a shaft is used to connect the motor gearbox to the rotor. In powerful installations, a belt type drive is used.
- Fastening elements. If the fan is installed on the outer casing of, for example, a boiler, mounting U-shaped plates are made. With significant power, it will be necessary to make a reliable and massive base.
This general scheme, according to which you can make a functional exhaust centrifugal unit with your own hands. It may change depending on the availability of components. It is important to comply with the housing sealing requirements, as well as ensure reliable protection power unit from possible clogging with dust and debris.
The fan will make a lot of noise during operation. Reducing this will be problematic, since vibration of the housing during the movement of air flows is almost impossible to compensate with your own hands. This is especially true for models made of metal and plastic. Wood can partially reduce background noise, 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:
Review and comparison of production ready models
When considering a radial fan volute, you need to take into account the material of manufacture: cast aluminum housing, sheet or stainless steel. A model is selected based on specific needs; consider an example of serial models in a cast case.
Many suburban buildings need ventilation. Without it, houses and sheds become damp, cellars and basements get wet, and using a closet without a fan is, to put it mildly, uncomfortable.
Of course, it is not difficult to equip a toilet or cellar with an electric supply or exhaust fan, but many country houses are not always electrified. But the fan that I want to tell readers about does not require electricity - it is driven into rotation... by a rotary wind engine.
Anyone can make such a device. Its entire “mechanics” consists of a rotary wind engine and a 12-blade fan. Both are mounted on the axle of a bearing unit, which uses a bushing from the front wheel of a bicycle. The latter is secured with M4 bolts and nuts in the center of a circle cut from a sheet of plywood 8 mm thick.
The rotary wind turbine is assembled from a pair of half-cylinders and two disks made of 6 mm plywood. An old one will serve as a good blank for half-cylinders. aluminum pan or a bucket. A plastic container of appropriate size will also work. The pan is carefully cut along the diametrical plane and secured between a pair of plywood disks as shown in the pictures.
1 – wind fan; 2 – play closet; 3 – ventilation pipe; 4 – sump
1 – rotary wind turbine; 2 – nut securing the wind turbine to the shaft; 3 – bearing unit (hub from the front wheel of the bicycle); 4 – fan impeller (steel or duralumin sheet s2); 5 – self-tapping screw for fastening the wind fan on the ventilation pipe (12 pcs.); 6 – ventilation pipe (box square section, made from boards s20); 7 – nut securing the fan impeller to the shaft; 8 – receiver (plastic basin); 9 – M5 bolts and nuts for fastening the bearing assembly on the receiver cover (3 sets); 10 – receiver cover (s8 plywood)
1,2- end washers (plywood, s8); 3, 4 – rotor semi-cylinders; 5 – corner for joining half-cylinders and washers (6 pcs.); 6 – fastening of half-cylinders and washers (M5 bolt with nuts, 12 sets)
Making a fan impeller
(A – blank, B – finished impeller)
Fan impeller – 12-blade; It can be made from a steel or duralumin sheet about 2 mm thick. After making a flat piece, each impeller blade is bent twice, as shown in the photograph, approximately 90 degrees, and the direction of bending will depend on what kind of fan you need - supply or exhaust.
The wind fan is installed on top of a kind of receiver, which serves as a small plastic basin, in the bottom of which a hole is cut for ventilation pipe(asbestos-cement or made of boards). In the upper part of the receiver (above the fan impeller), holes are cut for the outlet (or intake) of air.
