How to make a solid compressor with your own hands at home? How to make an air compressor with your own hands: design options Do-it-yourself air compressor.

The compressor can be used in a wide variety of applications − for tire inflation, airbrushing, painting spare parts etc. With the necessary tools and certain technical knowledge, it is quite possible to independently manufacture this unit based on a conventional refrigerator. A homemade compressor gives about 7 atmospheres, which is quite enough for an ordinary garage workshop, so many are increasingly thinking about how to make such a compressor? Do-it-yourself refrigerator compressor it will turn out to be quite quiet and, most importantly, cheap at its cost.

On average, the manufacture of this unit will require about one thousand rubles for all accessories.

Before trying to make ours out of an old refrigerator, you need to compare these two options, i.e. , sold in specialized stores, and our homemade version. In total it is possible to distinguish a few major differences between them:

The design of the factory compressor has an electric motor that transmits torque to the working chamber through a belt drive. As for the homemade compressor, it consists of a housing and the engine itself, without belts.
In the factory version, automatic pressure relief systems, inlet and outlet filters, pressure gauges, etc. are already installed. In the compressor from the refrigerator, you will have to install the adjusting equipment yourself, taking into account all the features.
Despite the fact that most factory compressors are equipped with automatic systems, this feature is not implemented in some budget models. In other words, these units will have to be turned off on their own, marking the time by the clock. Homemade compressors are mainly equipped with a protective relay that turns off the engine when there is a risk of overheating.
In some factory models, any lubrication may be completely absent. Of course, they have a small motor resource, but there are no various exhausts. This circumstance is very important, especially if the spray gun behaves rather capriciously, not tolerating various impurities. As for homemade compressors, there is plenty of this oil. By the way, you need to pay attention to which one to fill in - synthetics are very poorly combined with the usual, so you do not need to pour everything that is horrible.
The main feature of a homemade compressor is that it works very quietly, especially if you put all the tubes on it correctly, observing tightness. As for factory compressors, they behave more noisily, so its use is only possible outside the home.
The cost of manufacturing a home-made compressor is very low, because we take the main components from old equipment, and the control equipment will cost us one thousand rubles. As for the factory compressor, the situation is different.
It is not possible to make any technical changes to the factory compressor. In other words, if the unit is not powerful enough, then it can only be used as a pump for, no more. Homemade options are good because you can add some details to them, for example, a large receiver, so you can significantly increase the power of the device.
The factory compressor is a complete technical device, so any improvisation with it is impossible. With a home-made unit, you can do almost everything - take some parts out of the case, or hide everything in one box, and attach a handle on top for easy transportation.
You can install a fan on a homemade compressor so that it cools the device from the outside.

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Most refrigeration compressors have some limitations in terms of their work. There are several modes in total:

Normal - 16 to 32 C.
Subnormal - 10 to 32 C.
Tropical - from 18 to 43 C.
Subtropical - from 18 to 38 C.

However, combined modes are more common, having a different range.

Thus, a homemade compressor can be much more efficient than factory, in terms of working with air.

In the video, a version of a home-made compressor for pumping wheels

Dismantling works

To make a homemade compressor from the refrigerator, you need to make initial preparations. It consists in certain dismantling works, i.e. we just need to remove the compressor from the refrigerator itself. It is located behind the refrigerator, in its lower part. To remove, we need an elementary set of tools: pliers, box wrenches and two screwdrivers (plus and minus).

The compressor is located between the tubes that are connected to the cooling system. These tubes must be cut off with pliers, but in no case should they be sawn off with a hacksaw. The fact is that with this method, small chips are inevitably formed, which can get inside the compensator.

Then we proceed to the removal of the starting relay - this is an ordinary black box, with wires sticking out of it. We unscrew the fasteners, then we bite the wires that lead to the plug. We must not forget to mark the top and bottom of the starting relay - this will come in handy in the future. By the way, we also pick up all the fasteners along with the unit itself.

Health check

After we removed the compressor, it is necessary check its performance.

The fact is that we are removing the device from an old refrigerator, so we need to make sure that our unit is still “alive”. So, we flatten the tubes with pliers - this is necessary in order for air flow to pass through them. Next, we need to put the starting relay in the position in which it stood in the design of the refrigerator. This is very important, because if the position is incorrect, there is a risk of damage to the device, as well as failure of the compressor winding.

There are wires on the relay case to which you need to fasten a piece of wire with a plug. It is better to wrap the junction with electrical tape to eliminate the risk of electric shock. Plug in the device. If you did everything right, then the compressor will work, and air will come out of its tubes. By the way, it is necessary to mark which tube the air flow comes out of, and which one it goes into.

Step-by-step instruction

Before you start making your own, you need to make sure that you have all the necessary materials and tools.

We offer you to watch a video with a detailed description of the process of one of the manufacturing options

Read also: We select oil for the air compressor

In addition to the compressor itself, which we previously removed from the refrigerator, we need:

Receiver. In this case, you can use the body of an old fire extinguisher, or weld the body of sheet metal and pipe.
Various hoses. At the same time, the length of one hose must be at least 600 mm, and the other two - about 100 mm. In this case, you can take the hoses from the car.
Various consumables - gasoline and diesel filters, wire, clamps, pressure gauge and epoxy.
Related tools, i.e. screwdrivers, pliers, drills, etc.
In addition, we need an ordinary wooden board, which will be the basis of the whole structure. We attach the compressor to it using ordinary screws. Fastening should be carried out exactly in the same position that he occupied in the design of the refrigerator.

We take any plastic container of a suitable volume (from 3 liters or more). In the upper part, you need to drill a couple of holes for the size of the outlet tubes. We insert the tubes, after which we fill everything with epoxy. The inlet tube, into which air enters, must be located in such a way that there is about 200 mm from its end to the bottom of the receiver. The outlet tube must be immersed ten centimeters inward.

This is a description of a plastic receiver, but for greater tightness, it is best to make a receiver in an iron case. In this case, there is no need to fill everything with resin, and the hoses are simply welded. In addition, only a pressure gauge can be installed on an iron receiver.

To install it, you need to drill a hole for the nut on the receiver case. We insert it, and then brew it. Only then we screw the pressure gauge into this nut, after which the work is completed. Now we attach the receiver to our base with a wire. The scheme will be something like this:

Our homemade unit is almost ready.

There are quite a lot of photos and videos of its work on the Internet, for example, it is shown how it is used in airbrushing and for painting various spare parts, so the expediency of its manufacture is quite obvious. Finally, we need to add a few extra touches to our device.

It is necessary to take one of the hoses, which is ten centimeters long, and put it on the filter. If this is difficult, you can slightly heat the end of the hose to make it easier to put on the fitting. We put the second end of the hose on the inlet of our device. In this case, the filter will protect against dust entering the case. The second 10 cm hose must be connected to the inlet of the receiver and the outlet of the compressor. In this case, it is better to tighten the joints with clamps. Our third hose must be put on the diesel filter, and the other end must be inserted into the outlet of the receiver. At the same time, the free filter fitting will later be connected to various equipment for airbrushing, a spray gun for painting, etc.

Another video on the topic

Some technical data and service features

It is rather difficult to say unambiguously what kind of pressure this or that compressor will show. Much depends on the specific brand and the operational life of the device itself. By the way, old units show even higher performance than modern ones.

Read also: We repair Resant voltage stabilizers with our own hands

Maintenance of our homemade device is a very important point in operation.

The main work will be to replace diesel and gasoline filters, as well as to change the oil in the device. The design of the compressors is present, as a rule, three copper tubes. We used two of them earlier, and the third remained untouched. It is the shortest and soldered at the end. So, the oil is drained through it. To do this, it is necessary to cut off the soldered part, and then drain the processing. Filling is done through it.

Does the compressor need to be repaired?

As for the repair of the resulting device, then here everyone decides for himself- whether it makes sense to mess with it or not.

The repair will consist of ringing the relay, as well as changing the oil in the device. If the manipulations did not help, then there is absolutely no need to invent something else. It is best to throw out the used device, and then make a new one. Moreover, the issue price is no more than 1000-1500 rubles.

Conclusion

In principle, we figured out how to make a compressor from a refrigerator.

It is difficult to overestimate the expediency of its manufacture, because with the help of this device it is possible to perform various works on airbrushing, tire inflation, painting various components and other works that require pressure force.

An additional advantage is that such a device can be used at home, because it makes little noise. In fact, this is the same refrigerator, only without unnecessary body parts.
Compressors recommended for ordering are listed below:

Description and characteristics

CALIBER KMK-800/9

Compressor type - piston oil

Engine type - electric

Power - 800 W

Max. compressor capacity - 110 l/min

Min. pressure - 0.2 bar

Max. pressure - 8 bar

Receiver volume - 9 l

Drive (type) - direct

The car is a device for the mechanical compression of gases, which generates an air pressure at the outlet that is greater than atmospheric in value. By forcing air into the combustion chambers of the internal combustion engine, the compressor increases engine power by increasing the efficiency of fuel combustion. When the supercharger is running, the fuel mixture contains more air, which makes it easier to ignite and release more energy during combustion. In the course of research, it was found that the engine adds 46% of power and 30% of torque to the latter - this device is so important!

This device is used as a power supply for pneumatic tools

The air compressor is installed not only in cars with internal combustion engines - this equipment is used as a power supply for pneumatic tools, in industry and other industries. The main performance characteristics of an air compressor are operating pressure and capacity in liters of air per minute.

The following types of air compressors are distinguished:

Piston. Device with direct force transmission. During engine operation, the piston moves through the cylinder and compresses the air that enters the system. There are oil and oil-free piston blowers, the latter being widely used to power spray guns in the painting industry. Air two-piston compressors are used in industrial applications due to their high performance.
Rotary. The transmission of power from the engine occurs with the help of a belt. Propellers with rotating blades compress the air inside the device and create. Rotary equipment is characterized by high performance, good efficiency, low noise and vibration during operation. Air type oil is used sparingly and does not enter the compressed air. 380 V received special distribution in production.

The blower can operate independently or with the use of a receiver, which provides a smooth supply of compressed air to the system. An air compressor without a receiver is less expensive and smaller, but more prone to breakage.

Is it possible to do it yourself?

Not everyone can make an air compressor on the engine on their own, moreover, making modifications not provided for by the automobile manufacturer can unpredictably affect the operation. However, it can be assembled for a garage or auto repair shop - using such a device, you can quickly fill tires with air, create excess pressure for a spray gun and other pneumatic tools, and also find other uses for the equipment.

A do-it-yourself compressor with a receiver will last a much longer period than purchased equipment, provided that it is properly assembled from high-quality parts. This is due to the fact that the master, who set out to make an air compressor with a receiver, makes it for himself, and for this reason he cares about quality. What parts are needed and how to assemble?

We collect the compressor with our own hands

The main element of a homemade air blower is the propulsion system. It is recommended to use for the refrigerator. It is notable for the presence of a starting relay, which makes it possible to set and maintain a certain level of air pressure in the receiver. If you don’t have an old and unnecessary refrigerator at hand, you can find the unit at an industrial waste dump or with friends. Preference should be given to a refrigerator made in the USSR, since powerful and reliable compressors were used for the production of Soviet refrigeration equipment.

The refrigeration supercharger has three tubes in the design, one of which is sealed at one end. The rest are air ducts - one lets air in, the other lets out. With further assembly of the unit, it is important to understand in which direction the air flows circulate. To determine, it is necessary to turn on the compressor for a short time in the network and observe in which direction the circulation occurs. It is recommended to mark the "input" and "output" with different colors so as not to be confused during assembly. An air check valve for the compressor will help prevent arbitrary change in air direction.

In addition to the heart of the old refrigerator, to assemble a car compressor you will need:

Air receiver (a good option is a fire extinguisher).
Pressure gauge.
Coarse fuel filter.
Moisture filter.
Air pressure control relay.
A set of adapters, clamps, hoses.
Toggle switch for voltage 220 Volts.

At various stages of assembly, you will need: a base for installing the finished unit, wheels (you can take it from old furniture), paint, engine oil and an anti-corrosion agent.

Receiver Assembly

The compressor receiver is a solid container that contains pressurized air. The role that the car air receiver performs is to eliminate pulsations during the air supply by the compressor, which is carried out by equalizing the pressure in the system. The secondary role of the receiver is the storage of inert gases or condensate.

The receiver capacity is absolutely hermetic, and the required volume depends on the cycling of air consumption by the consumer and the performance of the air compressor. The use of a receiver extends the life is often used in various fields, including painting work, industrial production and other industries.

An automobile air receiver can be manufactured in three ways:

Carbon dioxide fire extinguisher. Well suited for long-term storage of gases under pressure up to 10 atmospheres, it has strong steel walls and is safe to use. A fire extinguisher with a volume of 5-10 liters is sufficient for the receiver. To turn the fire extinguisher into a compressor receiver, it is necessary to remove the shut-off and starting device and put the prepared hose adapter on the hole. The bottle must be emptied and washed thoroughly. Next, a water cross is installed and sealed. After that, you can use the manufactured receiver for work.
Hydraulic accumulator. A more specialized device with a sufficient range of capacities. The disadvantage is the low nominal pressure. Plus - a suitable thread at the exit. To use as a receiver, remove the internal carbon dioxide storage membrane, then connect the hose as in the fire extinguisher example.
Oxygen balloon. Exceptional strength and air pressure of tens of atmospheres, but small capacity, inconvenience of transportation and heaviness. To use, just connect the hose - the homemade receiver is ready to go!

A do-it-yourself air receiver can be made from any cylinder for storing compressed gases, but before using it, you need to make sure that the selected container can withstand the operating pressure of the future compressor.

Final assembly of the compressor unit

The compressor with the receiver should be installed on the same common base for ease of storage and transportation of home-made equipment. The compressor from the refrigerator, found earlier, must be cleaned of rust (if any). Next, the oil in the air compressor is replaced, since the old one has probably become unusable. It is not possible to pour oil into an air compressor - in the absence of a special compressor lubricant, you can use motor, synthetic or semi-synthetic.

Mount the compressor and receiver on the same base for easy storage and transport

The assembly of the compressor is carried out in five consecutive steps, as follows:

Install the supercharger from the refrigerator on the prepared base and secure with threaded studs. The receiver is installed in a vertical position and secured by means of folded plywood sheets in the amount of three pieces with a hole for the balloon. Wheels are attached to the bottom of the base for easy transportation.
Install the compressor and check valve for the air compressor in the air intake port. For convenience, you can use a rubber hose.
Install a water separator through a hose on the outlet pipe of the supercharger - it can be taken from a diesel engine. To prevent the hose from breaking under pressure, it is necessary to strengthen the connection with automobile clamps. A moisture separator must also be installed at the inlet of the gearbox - devices for decoupling pressure in the receiver and compressor. The outlet pressure pipe is connected to one end of the water cross.
Install a relay on the top of the cross for pressure adjustment, and a pressure gauge on the free end for control. All joints must be firmly reinforced with fum-tape and tightened with clamps to prevent breakdown.
Using a 220 volt toggle switch, connect the mains phase to the compressor output. Insulate the contacts with electrical tape or a dielectric casing.

After connecting the equipment to the network, it can be considered that the oil air compressor is assembled. You can connect the device to the network and check its operation.

What problems can await during assembly?

Auto air compressors are simple in terms of design and operation of the device, however, during self-assembly, you may encounter the following problems:

Oil supply to the wrong hole. Due to the presence of several tubes in the supercharger, you can get confused and fill in oil at the wrong hole. To prevent a problem, oil must be poured into any of the two inlet tubes - the outlet is excluded.
Small diameter receiver inlet. If using a standard cylinder thread is not possible, flux the element and attach a collet. The final design is able to withstand a pressure of 5-6 atmospheres.
Incorrect connection of the blower tubes. In order for the circulation in the system to occur without failures and in one direction, it is necessary to install a check valve on the compressor with your own hands. It will prevent possible problems and ensure stable operation of the supercharger.

Try to assemble the oil blower with your own hands in full accordance with the instructions, recommendations and safety rules. In this case, there will be no problems with the operation of the equipment.

Setting the required pressure

An air motor compressor or a car supercharger must be properly prepared for the first use. To get started, you need to set the pressure mode using the relay. Adjustment is carried out by means of two springs - a large one sets the minimum pressure, a small one sets the maximum. The first contact of the relay is connected to zero, the second is attached to the supercharger.

WATCH THE VIDEO INSTRUCTIONS

When using the equipment for the first time, follow the readings of the pressure gauge - the relay should turn on and off the supercharger when the lower and upper limits of the set pressure are reached, respectively. After the final adjustment, you can paint the homemade supercharger and continue to operate.

An air compressor is necessary for every car owner, since it is very expensive to use the services of car services for any problem. For an urban car enthusiast living in a high-rise building, a compact, portable electric tire inflation pump is enough. If you have your own garage, a compressor device is already a mandatory measure. The device is useful for connecting a pneumatic tool, for repairing and painting a car. It is quite possible to make a compressor yourself, which will save up to 50% of the cost of a production plant.

Principle of operation

The homemade compressor works according to an elementary scheme:

An electrically powered or manual type pump is connected.
Air under pressure enters the container with a sealed design (a receiver or a cylinder is used).
The design has an outlet valve that directs air through the hoses to the spray gun, wrench, tire inflation adapter, etc.

As auxiliary elements, a pressure gauge is used to control the pressure and an automatic system for venting excess air. To prevent rapid wear of the device and ensure a high-quality work result, filters are connected to the output line to protect against the ingress of oil and moisture.

An air compressor is essential for every car owner.

Compressor from a fire extinguisher with a motor from a refrigerator

To create a homemade compressor, an OU-10 fire extinguisher or equivalent is suitable.

The procedure is carried out in stages, below are detailed instructions:

Clean the cylinder from the inside and outside of the remnants of the foam solution, dirt, rust and other contaminants.
Insert the adapter into the thread, installation must be carried out tightly.
Fix a quadruple to the adapter, female thread, size ¾ inch.
In the motor from the cooling installation, you should find the tip of the oil fill tube. Bite off the end with side cutters and replace the oil.
Drain the previous grease into a container with measured marks to determine the amount of oil.
Using a syringe, inject new oil into the electric motor, add 10–12% when calculating the amount.
Plug the oil filler tube again, you can squeeze the ends or insert a bolt wrapped with fum tape.
Find a starting relay in the motor, which, together with the cylinder, should be installed on the frame of the future unit. As fasteners, it is better to use bolts, but ties will also work.
Install a gasoline-type filter on the air intake pipe to clean the resulting air. Installing the filter involves installing a rubber adapter.
Fasten the fuel filter from the diesel engine with a device for separating moisture to the outlet line from the supercharger with clamps. Without a filter element, drops of water and oil will get into the paint.
Connect a reducer to the line to maintain pressure inside the cylinder.
Behind the reducer, the hose is attached to the quad.

Compressor from a fire extinguisher with a motor from a refrigerator

The remaining quad inlets are equipped with a pressure gauge and a relay to control the pressure level.
To adjust the minimum and maximum pressure on the cylinder, a spring-type control relay is installed. Connect it with one wire to the engine, and the other side to the negative wire of the network. The wire for connecting to the "plus" is connected to the start button. For a quality connection, soldering and high-quality insulation are used.

Compressor from a gas cylinder with a supercharger from a truck

An alternative way to make a compressor with your own hands is to use a 50 gas cylinder, an asynchronous motor and a compressor from the braking system in the ZIL-130. All elements are mounted on a frame, but you can do without it and make a carrier element from a cylinder to which a pump, filter, electric motor, and work control equipment are attached.

The simplest do-it-yourself compressor block can be made according to a step-by-step guide:

Weld the fitting into the air inlet line from the pump unit to the receiver.
Fix the adapter for the output line from the receiver to the pneumatic tool.
Weld the fitting for mounting the pressure gauge.
Attach an adapter to connect the reset valve, it can be replaced with a relay. When pressure rises to critical levels, pressure will be released.
Insert a ball-type valve to remove condensate from the bottom of the cylinder.
Fasten the pump and motor with a drive belt that is mounted on the shaft pulleys.

Compressor from a gas cylinder with a supercharger from a truck

Create the electrical system of the installation: a button for turning on, off, connect 2 capacitors with a capacity of 30 microfarads and a starting element of 60 microfarads, a time relay and a magnetic type starter.
Install a device for filtering the air flow against the supply line.

The manufacture of a powerful automotive compressor for painting can be carried out according to various schemes. The main advantage of these methods is the availability of materials.

Making an air electric compressor 220 V with your own hands

Making a compressor with your own hands is easier than it seems at first glance. Let's take a step-by-step look at the basic principles of how to make a compressor.

Necessary materials

Properly preparing materials is half of the successfully completed work on assembling a compressor unit. To create a classic device with operation from a 220 V network, you will need:

manometer;
relay for pressure control;
gearbox with built-in oil and moisture protection filter;
cleaning filter from a gasoline engine;
water cross with internal thread;
threaded adapters;
clamps or ties;

Making an air electric compressor with your own hands

engine;
receiver;
motor oil;
switch for operation with voltage 220 V;
brass tubes;
oil-resistant hose;
board;
medical syringe;
substance to eliminate corrosion;
washers, nuts and studs;
means for creating hermetic connections;
car enamel;
file;
small wheels from toy cars or furniture;
diesel engine filter.

Assembling the engine

Let's prepare the motor first. Its role is to build up air pressure. In order not to buy a special engine, you can use the engine from an old refrigerator.

Motor from an old refrigerator for making a compressor

There is a relay in the device of the power unit, it is useful to maintain the selected pressure value in the system. Professionals note that Soviet refrigerators were equipped with more efficient motors, they are suitable for creating a compressor with greater power compared to imported products.

First of all, the motor is removed from the refrigerator. To make it usable, you will have to clean the case. It is important to use a detergent that will prevent oxidation and corrosion. After cleaning the surface, the motor is suitable for painting.

Assembling a homemade compressor:

The motor contains 3 tubes: 1 sealed and 2 open for air circulation. The definition of the output and input channel is required: the easiest way to find out about the role of the tubes is to turn on the motor.
After external treatment, the oil must be changed. A semi-synthetic agent is best suited, which is not inferior in characteristics to a motor one and contains various useful components. For replacement, a plugged tube is used, the end of which is cut off with a file. It is important to prevent sawdust from entering the system, therefore, after making a file, you need to break the tube and inject new oil with a syringe.
It is important to properly seal the oil filling passage to prevent leakage. A screw with an appropriate section is selected, a fum tape is applied to it. In the process, a sealant will come in handy. The bolt is tightly screwed into the pipe.
The motor and relay are fixed on a thick base board. The sensitivity of the relay requires that the angle of the motor location that was present in the refrigerator be observed. Additionally, a marking is installed on the engine with the recommended housing location for stable and full-fledged operation.

Compressed air tank

The air tank is an integral component of the compressor, without which the unit will not work. When choosing a tank, it is important to consider the amount of pressure that the cylinder can withstand (indicated on the body). An alternative option would be to use a receiver, old containers from a 10-liter fire extinguisher, since these tanks are sealed and quite reliable.

The air tank is an integral component of the compressor, without which the unit does not work.

The start valve is replaced by a threaded adapter that is screwed onto the receiver. Creating a tight connection will ensure the use of fum tape.

If there are pockets of corrosion on the receiver, it is pre-cleaned with sandpaper or a grinding machine. To remove rust from the inside, pour a special agent into the container and mix thoroughly. Next, a water-type cross adapter is installed, it is mounted using a sealant.

Assembling the device

The final assembly is carried out in stages:

The prepared receiver and motor are attached to a thick board. For fixing to the base, washers, nuts and studs are used. The location of the tank is strictly vertical. A reliable connection will be provided by 3 sheets of plywood, on one of which a hole is cut to insert the container. The rest of the sheets are attached to the wood and the receiver's plywood retainer. From the side of the floor, furniture wheels are welded to the bottom for ease of movement.
A rubber hose is put on the air capture tube, to which a cleaning filter from a gasoline engine is attached. Separate clamps for attaching the filter are not required, because the inlet pressure is low.
To prevent the ingress of oil and water particles into the working composition, an oil and moisture separating filter from the diesel engine is installed on the outlet tube. Due to the relatively high pressure in the wire, it is recommended to use auxiliary fasteners, screw clamps will do.
A cleaning filter is installed at the inlet of the gearbox; it will be required to create an isolation and direction of air movement. The connection is made with a water pipe type cross on both sides. A pressure switch or pressure gauge is installed on the opposite side to control and adjust the pressure level in the receiver. An adjustment relay is installed on top of the cross. All elements are mounted hermetically.

Materials for assembling a homemade compressor

By means of the adjusting pressure, intermittent operation of the self-made structure is ensured. To set the relay, 2 springs are actuated: one for setting the maximum pressure, and the second for the minimum.
The contact of the electrical circuit is connected to the supercharger, and the second is connected to the "minus" phase. The second wire is connected to the supercharger through a toggle switch and with the mains phase. The toggle switch acts as a start button for activating and deactivating the device without removing the plug. All contacts are connected by soldering and then insulated.
Painting of metal structures.

After creating the compressor, it remains only to check its performance.

Testing and setting up a homemade

Having made a powerful compressor with your own hands, you should connect an airbrush to it.

Check algorithm:

Set the position of the toggle switch to the inactive position, connect the plug to the electrical circuit.
Initially, set the relay to a low value and start the installation. Control the work according to the readings of the manometer. Now the user should make sure that the relay is working, it should open the circuit when the indicators are exceeded.
To check for leaks, a soapy solution is used, which wets all connections.
Now the spray gun is turned on to release the container from air. If the system is in good order, after the pressure drops, the device should turn on.

If the device has passed all the stages of verification, it is recommended to try the device in action by trying to paint the body element. The greatest attention is paid to the quality of the layer and composition, as well as the stability of work.

We test and set up a homemade compressor for painting cars

The tank must be cleaned inside and out, otherwise progressive corrosion will create a hole. Sandblasting is one of the most effective and easiest cleaning methods. created with relative ease.
Before the start of work, body elements are straightened. You can go the standard route and use a hammer, hoods, spotter, and then paint the body, but the developed one helps repair damage without painting.
Be sure to paint with an airbrush after applying the primer. extremely effective, but has features of work and compatibility with other materials.
Before painting, all adjacent elements are either dismantled or pasted over, especially for glass. If paint gets on glass, there is a risk of damage to the material in the process of removing the product. The auto glass repair kit will help restore glass from most damage. Roof rails on the roof of a car are difficult to dismantle, it is better to cover with a film and wrap it with tape.

Conclusion

In the manufacture of an electric type compressor by hand, it is possible to save a considerable amount. Additionally, the design can be retrofitted to create an apparatus suitable for specific purposes. A ready-made installation is often used for painting, connecting a sandblaster, blowing a body after washing and inflating wheels.

Then the author used the unit from a truck, it is driven by a three-phase motor of 3 horsepower. An interesting fact is that the system is equipped with forced lubrication of the compressor under pressure, the car pump from the power steering is responsible for this. If you are interested in the project, I propose to study it in more detail!

Materials and tools used

List of materials:
- an old compressor from a truck;
- 3 hp three-phase motor or similar;
- pulleys, belts, wiring, switches, etc.;
- car gas bottle or other similar container;
- sheet steel, profile pipes, corners;
- wheels for garden carts and axle;
- tubes, hoses, fittings, manometer, filters, etc.;
- car power steering pump (author from Audi 80);
- screws, nuts, fum-tape and more;
- mesh (to make a protective shield);
- dye.

List of tools:
- Miter saw;
- Bulgarian;
- welding;
- screwdriver;
- drill;
- vices, wrenches, etc.

Compressor manufacturing process:

Step one. Install wheels on tank
We will install wheels on the tank so that this weighty car can be transported. To do this, we install reliable steel clamps on the tank and tighten them with bolts and nuts. It is to these clamps that we will then attach all the necessary equipment.

When the clamps are installed, we fasten the axle with wheels. As an axle, we use a rectangular profile pipe, to which round axles for wheels are welded. We choose wheels stronger, with steel disks and bearings, since the weight of the device is quite large.

We also need to weld a leg in the front of the machine, it is made from a piece of pipe, to which a sheet steel nickel is welded.

Step two. Equipment frame manufacturing
The compressor, as well as the engine, will be installed on top of the receiver, they will be attached to the clamps. We make the frame from a corner, as well as sheet steel. We drill holes for the compressor and cut the threads, we will statically fasten it to the frame with screws.

As for the engine, it must be able to ride along the frame so that the belt can be tensioned. We drill holes, and then combine them with a grinder to make slotted holes. As a tensioner, we weld an elongated nut to the frame and wrap the bolt. Now, by tightening the bolt, the engine can be moved back and the belt tensioned.

We weld pieces of steel plates to the frame and then install the frame on top of the receiver. A handle can also be welded to the frame so that there is something to take the compressor for, the author welded it from a profile pipe.

Step three. Adapter
There is a hole in the cylinder with a large diameter, here you need to make an adapter, the author made it from sheet steel. We put a piece of paper to the hole and look for a pencil where to drill holes. Well, then it’s a matter of technology, we cut the workpiece, drill holes and weld the pipe. It is very important that the weld be strong and tight.

Step four. Drain and inlet pipe
We drill a hole in the "belly" of the receiver and weld the nut. As a "crane" will use a regular screw. This part is needed in order to drain the condensate from the receiver, which will certainly form there over time.

Step five. Leak test
To check the tightness of the cylinder, the author poured water into it, and then created a pressure of more than 20 bar. If no leaks are detected at this pressure, then the cylinder is assembled very reliably. It is important to inspect all welds and the drain screw, these places should be dry.

Step six. Connecting equipment
Next, we connect a hose from the compressor to the receiver, and also screw a splitter into the cylinder to connect the selective hose, pressure gauge, valve, and so on. We carefully isolate all threaded connections with fum-tape.

Step seven. Lubrication system
The compressor needs forced lubrication, for this we need a small pump. As a pump, the author decided to use a car pump from a power steering, we also need hoses, a pressure gauge and other spare parts. The lubrication circuit has a 3 bar valve, if the oil pressure rises above this value, the excess oil is sent back to the oil reservoir.

Step eight. Protective shield
For a belt drive, you need to make a protective shield so that clothes or something else does not get pulled in there. To do this, we need a grate made of steel or aluminum. We cut it, rot and cook if necessary. Well, then we fasten the grate with screws to the car.

Or a workshop.

For assembly we need:

1. Compressor from the refrigerator.

If you remove it from the refrigerator, cut off 30 centimeters of copper tube, we will need it later.
2. Receiver.

It is a durable container for compressed air. You can make it from an empty freon cylinder, which is used to fill air conditioners. The easiest way to find it is to contact any car service that provides refueling services for car air conditioners. They throw away empty bottles.

A red, 50 liter propane tank is also suitable as a receiver. You can buy it on Avito for 500 rubles.

Next, we need spare parts from the purchased compressor. You can find them at any major hardware store in the power tool section.

3. Pressure switch.
4. Pressure regulator.
5. Rapid adapter.
6. Safety valve 10 bar.
7. Pressure gauge from 10 to 12 bar.
8. Dehumidifier.
9. Four small wheels.

10. Small things. To facilitate the search for parts, we turn to any plumbing store, we purchase everything according to the list.

All parts will need to be connected according to the diagram.

For the reliability and tightness of threaded connections, it is advisable to use a special adhesive sealant.

An important part of our compressor is the air filter.

A very good solution would be to use a gasoline filter from the classics.

We also buy a vacuum hose from the auto shop.

The platform on which the compressor and receiver will be mounted will be made of plywood or chipboard.

We fix the receiver with a steel tape.

Let's start assembling.

We drill three holes in the receiver with a diameter of 10 mm.

Sandpaper cleaning the place for welding, weld the nipple to the holes.
Attach the purchased wheels to plywood.
We will fix the receiver on the resulting trolley.
The compressor from the refrigerator is fixed with self-tapping screws.
We put our gasoline filter on the intake port of the compressor.
We will make the connection through a piece of vacuum hose.

We put a flexible hose on the retracting end of the compressor.
The hose should be cut off in place. Fastening to the branch pipe is made on a worm clamp.

Now we assemble the automation unit.

We screw the pressure switch, safety valve, pressure gauge, pressure regulator into the hole.
Connect the rapid adapter to the pressure regulator.

The final step is to connect the elements of plumbing.

And we attach to them a pre-assembled automation unit.

A piece of copper tubing. Its function is to relieve pressure.
After the compressor pumps air into the receiver, the pressure switch opens the valve through which the pressure in the discharge system is relieved.

This is done in order to facilitate the start of the compressor, since it will not start under pressure.

We fix the tube at the very end. To do this, you need to expand one end of the tube as in the figure. This can be done with a steel ball and a hammer.

And connect the extended end to the pressure switch.

Connect the other end to the fitting through a vacuum hose.

Our compressor is ready, but in order to have enough for the work performed in the garage, an option was provided to connect an additional receiver through an oxygen hose.

To do this, in addition to the above, you need to buy:
Two 50 liter propane tanks.

15 meters of oxygen hose.

Quick-release hose adapter for connecting pneumatic tools.

Tee for combining cylinders.

Two 1/2 ball valves, 3 1/2 fittings, 1/2 tee, worm-type clamps.

Putting it all together, you get a real, big compressor.

Like any mechanism, such a compressor is endowed with pluses and minuses.

Pros.

First, the assembly cost is 5500 rubles. Approximately 2 times cheaper than a compressor of the same volume.
The second is the noise from work, because it makes no noise louder than a refrigerator.

Third, and perhaps most important, is reliability. Since the reliability of Soviet refrigerators is beyond doubt, which means that it will last a very long time.

As for the automation of the compressor, it all depends on your choice. After all, the price of the same pressure switch starts at 500 and ends at 3000 rubles.

4. High maintainability. After all, in the event of a breakdown, there will be no problems with spare parts.

Now about the cons.