Do-it-yourself electric air compressor. Compressor design at home. Homemade mechanism for pressurizing - components

The compressor can bring a lot of benefits in various areas of life. Perhaps you need a device for quickly inflating car tires, or you decide to do airbrushing, but you don’t have the right equipment, and you don’t want to buy it. You can solve this problem by making a compressor with your own hands. We will talk about how to do this and what is needed for this.

Make or buy

Before you learn how to make a compressor with your own hands, you need to figure out how and what tasks it can solve homemade version, and how to deal with them purchased in the store unit. In this regard, everything depends more and more on the direction for which you need a compressor. If you need it for a simple tire inflation, then you can use a home-made one.

Another thing is if you are drawn to creativity. It doesn't have to be airbrushing to trip over flaws. home version. The thing is that painting requires a uniform and uniform air flow. It should be free of debris and other small particles.

If these conditions are not met, it will be possible to get grainy paint or other types of defects as a result. This is what you should think about first of all when you see photos of homemade compressors.

To all of the above, you can add inhomogeneous spots and streaks, which will be a problem even when painting a bicycle frame, to say nothing about car details.

Despite this, both types of compressors are arranged in much the same way, as far as the basics are concerned. In any case, you need a tank in which the air is under high pressure. It can be generated by manual injection, or it can appear from mechanical impact.

If the first option is cheaper to implement, then it should be borne in mind that it will be much more difficult to work, because you will constantly need to monitor the pressure level inside the compressor.

In case the compressor is equipped with additional automation, all you need to do is add oil from time to time or change it. The result of the operation of such a device will be a constant and uniform supply of air, which can play a very important role for you.

Preparation

Here we come to step by step instructions to assemble the compressor at home. If we talk about its advantages, then first of all it is worth remembering the volume of work, because such a unit will work much quieter than the factory version. To do this, it will be necessary to hermetically connect all the components, but this work is worth the effort.

What can you make a compressor with your own hands?

First you need something that can replace the receiver. A simple car camera works well for this. Next, you will need to find a simple pump on which a pressure gauge is installed. It is needed to increase the air pressure inside the chamber. To this we add a simple awl, a wheel repair kit and a simple camera nipple.

First of all, you need to make sure that the chamber is still tight and does not let air through. If it turns out that she is not coping with her tasks, in the conditions high blood pressure the consequences can be serious.

If during the check you find air leaks, then the chamber must be sealed, and this is best done using vulcanization.

Since our camera will act as a receiver, we will need to make another hole in it, for which we need a simple awl. It will need to paste the nipple, which I spoke about earlier. It will be used to bring air into the chamber.

For correct installation the nipple will work well with the repair kit, which is listed in the list of necessary parts. Then we unscrew the nipple and check how the air moves.

A do-it-yourself mini compressor is made according to the same principle, you just need to take a smaller chamber, for which you need a pump of less power. Such an installation will have lower productivity, but will have a certain compactness.

Peculiarities

After everything that has been done before, you need to install the bleed valve on the nipple that was originally on the camera. It is necessary to ease the pressure if it rises too high. In order to check the performance of the device not only by direct use, it will not be superfluous to install an additional pressure gauge.

Otherwise, if you are painting, you will need to first make a test run, then look at the uniformity of the enamel or plain paint, and only then start working. This is not very convenient, and can be quite expensive, depending on the price of materials.

It is important to know that when checking the pressure level with a pressure gauge, its arrow should not twitch. If this happens, the whole structure should be checked, as this is a signal that the air flow is not uniform.

In fact, the idea of ​​\u200b\u200bhomemade compressors and the manufacture of one does not require any superpowers. Naturally, you will need direct hands, basic skills in working with different tools, and, most importantly, the desire to do all this. If you need a compressor for professional needs, then it is better to turn to ready-made solutions.

There are many reviews that homemade compressors work more reliably and at the same time more durable. It is important to understand that it depends primarily on who made this unit, and no less important are the materials that were used to create it.

If you want to work in your garage or shed as a hobby, then you have enough free time to do it - why not.

DIY compressor photos

This air piston compressor is very easy to manufacture and anyone can repeat it if desired. The compressor can be used to inflate balloons, for some chemical experiments where it is required to create air bubbles in a liquid, like an aquarium fish compressor, etc.

What is required to make a compressor?

• The motor with a 12 V gearbox is the most scarce part, you can buy it here -
• Several bicycle spokes.
• Two valve nipples from a bicycle.
• 12 V power supply, you can buy it here if you suddenly don't have it -

Motor-reducer for 12 volts DC, with a speed of 300 rpm.

Bicycle spoke.

Manufacturing

So, if you have collected all the components, but we can start manufacturing our compressor.
Bend the needle at the end at a right angle.

With wire cutters we bite off the knitting needle on the other side, so that we can make such an L-shaped shape.

We insert the threaded part of the spoke into the hole in the gear motor shaft. The hole was there in the beginning. We fix the second locking nut from the other knitting needle, tightening it with pliers.

Then we take two knitting needles and wind one on the other. We take out the inner knitting needle, bite off a part of the knitting knitting needle. Here's what should happen.

We bite off at a distance of about 10 cm and make a bend.

Next, we put this curl on the part that was made earlier on the gear motor. The limiters were made from lock nuts from the spokes. Fix the nuts with super glue. We have a moving node. This is the piston lever that will push the compressor piston.

Let's take a piece wooden board and attach the motor with gearbox and our crankset using bracket, screws, and wooden block for elevation.

We take out the syringe, separate the needle - it will not be needed.

We take out the syringe plunger and cut off the lower edges into a cone to ensure greater ease of movement of the plunger, removing excess pressure.

With a hot soldering iron, from the side closer to the beginning of the syringe, we will make a hole for the nipple valve.

We insert the nipple, fix it with super glue. This will be the intake valve.

We fill the hole for the needle with hot glue - we do not need it.

We make another hole with a soldering iron and insert the exhaust valve, fix it with super glue as well.

For greater reliability, and so that there are no leaks, fill the valve connections with epoxy.

Take the paste from the gel ballpoint pen. Cut off a small piece about 1 cm. Glue this piece to the end of the piston with super glue.

Insert into it the end from the spokes of our mechanism. And install the modified syringe on a wooden stand. Everything is fixed with hot glue.

The compressor is a multifunctional device that can be used for various daily needs such as pumping car tires, painting and the like. But due to the high cost of factory models, many owners are thinking about assembling such a unit on their own. The most common option for creating a compressor with your own hands is to use a refrigerator.

Advantages of a factory and homemade device

Before independent production air compressor from the refrigerator, you need to compare it with a regular factory sample. This will help you make the right decision.

W factory and homemade devices have the following differences:

Motor restrictions

Not all refrigerator motors can operate under the same conditions. Some of them have their limitations in operation.

There are several modes of operation:

• normal - from 16 to 32 degrees;
• tropical - from 18 to 43 degrees;
• subnormal - from 10 to 32 degrees;
• subtropical - from 18 to 38 degrees.

But despite this, there are combined modes, which include several ranges of operation.

Thus, home-made devices are much simpler and more efficient than factory ones, in particular, for working with air.

Dismantling work with the refrigerator

In order to craft a mini-compressor with your own hands, you need to prepare for work. First you need to remove the compressor directly from the refrigerator. This is the initial stage. It is located at the bottom of the refrigerator at the back. To remove it, you should prepare a set of basic tools: pliers, a set of keys and screwdrivers (curly and regular).

There are two pipes on the compressor itself that connect to the refrigerator's cooling system. They must be cut off with wire cutters or pliers. It is strictly forbidden to saw them with a hacksaw, because when sawing, small parts of the metal can get into the motor, which can lead to disastrous consequences.

After that, you need to remove the starting relay. It looks like an ordinary black box with wires sticking out of it. First you need to unscrew the fasteners, and then bite the wires leading to the plug. Do not forget to mark the top and bottom of the relay so that later there is no error during installation. You also need to pick up all the fastening elements of the unit, they can also be usefully used in the manufacture of a high-pressure compressor with your own hands.

Health check

After disassembling the refrigerator and compressor, it is required to check the performance of all parts. This should be done due to the fact that the part was removed from the old refrigerator, and it may not work for a long time. Therefore, it is imperative to do so. First you need to flatten the tubes with pliers.

This must be done so that air can pass through them. Next, you need to put the previously removed relay back into the same position as it was before. Do not forget about the correct mounting of the relay. Top and bottom should be in place. If it is installed in a different way, the compressor may fail, which will lead to irreparable damage, or even burn out.

There are wires directly on the relay housing. They need to be wired with a plug. The place where the connection will be must be wrapped with at least electrical tape to avoid electric shock. It is advisable to carefully solder the junction of the wires before this.

After that, plug the compressor into the outlet and observe the performance of the unit. If it does not work, it means that the wires are not connected correctly or the compressor is not working. After turning on the compressor, air should flow from the tubes into the outlet. This will be an indicator of the health of the device. It is necessary to mark which tube the air comes out of and which one enters.

Step by step assembly instructions

Before starting work, you should prepare everything necessary tools and materials. Such sets may differ from each other depending on what is expected future owner compressor.

In addition to the compressor itself, which is removed from the refrigerator, need to prepare the following her:

Then you should take a plastic container of any size from three liters. In the upper part of the tank, you need to drill several holes for the compressor tubes. Then insert the tubes into the holes made and fill everything with resin. The inlet tube must be located at a distance of 200 mm from the edge of the receiver. The outlet tube must be placed 10 mm inside the container.

The receiver can be made of plastic and nothing bad will happen here. But for greater reliability, it is recommended to make it from metal box. With this outcome, there is no need to fill everything with resin for a good tightness, and the hoses are closed at the same time. Moreover, a pressure gauge can only be installed on a metal case.

To do this, in the receiver you need to drill a hole for the nut, which must be welded in such a hole. Then it is possible to screw the pressure gauge into the nut. After that, work on the creation of a homemade compressor from the refrigerator ends. Any material can be used for painting., but first you can clean and primed to avoid corrosion. After that, you only need to attach the receiver to the base with a wire.

Some technical features

It is quite difficult to determine initially what the pressure in the compressor will be. This indicator may depend both on the brand of the device and on the period of its declared operation.

By the way, old designs can sometimes show even better results than new and factory ones. The most important thing is not what kind of apparatus can be assembled, but how it will be necessary to take care of its condition.

Such work consists, as a rule, in the replacement of filters (gasoline and diesel), as well as oil in the device. All homemade compressors are equipped with three copper tubes. Two are used during installation. This is the inlet and outlet tube. The third was not touched. It is the shortest of all and soldered at the end. She is responsible for draining the oil in the device. For maintenance, it is necessary to cut off the soldered part, drain the oil, fill in new oil and solder it back.

Is the compressor repairable?

As a rule, the relay during repair must ring. You also need to change the oil in the device. If the compressor does not work after that, then there is no point in doing anything else, further repairs must be stopped. It is better to throw away such an autocompressor and make a new one. In addition, its price will not exceed one and a half thousand rubles.

By the way, the engine can also be used as a starting material for the compressor. internal combustion with blower. Thus, you can get a decent device with great power. Moreover, the piston group is provided with a high power reserve. If you have the opportunity and desire, you can find it for quite low price in great condition. With this option, the ignition, intake and exhaust system must be removed. For its successful operation, it is enough to lubricate the pistons, the cooling system and tightness.

Similar designs can be made from a gas cylinder. There are also diaphragm compressors.

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?

Do air compressor not everyone can do the engine on their own, besides, 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 correct assembly from 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 "input" and "output" different colors so as not to confuse during assembly. To prevent an arbitrary change in air direction, air check valve for the compressor.

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

• Air receiver ( 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 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:

1. 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.
2. 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.
3. 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 must be installed on the same common base for ease of storage and transportation. homemade 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:

1. Install the supercharger from the refrigerator on the prepared base and secure with threaded studs. The receiver is installed in vertical position and is fixed 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.
2. Install the compressor and check valve for the air compressor in the air intake port. For convenience, you can use a rubber hose.
3. 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.
4. 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.
5. 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?

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

1. 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.
2. Small diameter receiver inlet. If the use of a standard cylinder thread is not possible, the element is fluxed and attached. The final design is able to withstand a pressure of 5-6 atmospheres.
3. 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. He 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 desired 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 turn 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.

A portable air compressor, quiet, consuming relatively little electricity - this is probably the dream of every owner of a private house, cottage, garage, small business. Well, it is quite possible to make a mobile compressed air installation on your own, for example, by taking part of the equipment of an old household refrigerator. Each refrigeration unit has a built-in compressor. If you remove this part, add equipment, you get an air compressor from a refrigerator compressor,.

Before deciding to implement an idea, it is advisable to determine exactly: is this idea really worth taking on? Let's consider several important aspects of the topic in order to help future designers make the right decision:

1. not designed for air service.
2. The performance of compressors in household refrigerators is low.
3. To lubricate the mechanism refrigeration compressors special oil is required.

From this follow the corresponding conclusions. When working with air, the device will not be able to function. long time without good cooling.

When the refrigeration compressor works with freon, due to other temperature parameters of the refrigerant, the housing is cooled.

The compression of the air mixture by a refrigeration compressor occurs in completely different temperature conditions, which will lead to an increase in operating temperature by an order of magnitude. Ultimately, without good cooling, the compressor will simply burn out.

A burnt refrigerator compressor as a result of a violation of technological operating modes. The same fate awaits the device, which is supposed to be used in the project, if you do not apply special protective equipment.

The low performance of home refrigeration units is another factor limiting the use of such equipment for producing compressed air.

For example, in order to pump up a 5-liter receiver to a pressure of 5-7 atm., It will take at least 15-20 minutes of operation of the refrigeration unit.

Meanwhile, this volume of air is not enough even to inflate a car wheel in one sitting or paint one wall of a small garage with a spray gun.

Low performance of the refrigerator system is a common thing for such equipment. But for an air compression system, especially with a large flow rate, a high-performance system is already required

Finally, one more important factor- compressor oil. To lubricate the mechanism of refrigeration compressors, a special freon oil is used, the properties of which change dramatically in contact with air.

If you do not change the oil to another type of lubricant that is loyal in structure to air, after a certain time the compressor mechanism will simply “close” due to the rapid wear of parts.

DIY construction

So, if, despite all the noted nuances, a decision is made to assemble from the refrigerator, you can proceed directly to action.

Approximately such a design should be obtained as a result of the implementation of the conceived idea. By appearance no complaints. The device looks more than flawless and quite impressive

The first step is to collect all the necessary details of the project equipment:

1. Air receiver.
2. Oil separator.
3. Differential pressure switch.
4. Copper tube.
5. Inlet air filter.
6. Shut-off control and control valves.

For an air receiver, a compressed air cylinder from a KAMAZ vehicle is optimally suited. The five-liter capacity is acceptable for the household environment dimensions and complies with the requirements for pressure vessels.

A home compressor made from a refrigerator is best equipped with one of the cylinders that are used on KAMAZ truck tractors. These vessels comply with Rostekhnadzor standards
Design option of the oil separator, which is recommended for use as part of the installation. For reliable operation of the system, high-quality separation of oil from air is required.

A differential pressure switch (for example, from the PT series) is used from among those used in industrial refrigeration plants.

A sufficient amount of copper tube is available in the design of the condenser of a domestic refrigerator. In diameter, it fits the outlet pipe of the refrigerator compressor.

The air filter at the compressor inlet is easy to make from any suitable plastic container by placing an ordinary foam rubber sponge inside. Shut-off control and control valves - valves, check valve, pressure gauges - can be bought at the store.

Assembly of the air unit

An air receiver (for example, an air tank from a KAMAZ vehicle) is mounted on a chassis made of metal corner. Additionally, it is recommended to install a pair of wheels on the chassis for ease of movement, a supporting “leg” and a handle.

A platform for installing a refrigerator compressor and a bracket for mounting a differential pressure switch are fixed above the upper area of ​​\u200b\u200bthe cylinder. An oil separator is fixed to the side of the receiver, through a clamp and an outlet fitting.

Hand made oil separator. For fastening, one clamp with a bracket was used on the left side of the separator, and the right side is attached to the fitting of the inlet pipe of the receiver

An air filter must be installed on the inlet pipe of the refrigerator compressor. The presence of an air filter is required to reduce the entry of foreign particles present in the air into the system.

It is easy to make an air filter from any plastic container by attaching it through an angled threaded transition to the inlet pipe.

Air filter at the unit inlet. It is easy to make one with your own hands from a suitable plastic container. Foam sponge inside the filter housing

The outlet pipe of the compressor is connected through a compensatory copper tube-heat exchanger with the inlet fitting of the separator (oil separator). The outlet branch pipe of the separator is connected to the receiver through an angle adapter.

A tee is installed at the outlet of the receiver and (compressed air outlet). Through the branches of the tee, the outlet of the receiver is additionally communicated by copper tubes with a differential relay and a pressure gauge. There is also a safety valve.

Electrical part and principle of operation

The electrical circuit diagram actually remains intact, with the exception of minor changes. That is, the compressor from the refrigerator, as it was powered from the AC mains through the starting relay, so this option is left unchanged.

Another question is that it is possible to modernize the circuit somewhat. For example, supplement it with a switch installed on the body of the assembled unit. Still, this option is more convenient than periodically plugging and unplugging the plug from the outlet each time the device is used in practice.

This design does not have a separate power switch. The compressor is connected to the network with a two-wire cord with a plug through the contact group of the pressure switch

Also, the circuit for supplying voltage to the compressor must be configured taking into account the inclusion of the contact group of the differential pressure switch.

Due to this configuration, the device will turn off immediately after reaching the set air pressure limit. Here, in fact, that's all. The air compressor from the refrigerator can be considered done.

Some notes on the project

A fire extinguisher for a receiver for a home compressed air unit must be selected taking into account a three-fold pressure margin. Powder OT bottle is not the best choice

Often as a receiver for homemade projects fire extinguishers are used. Meanwhile, the containers of powder fire extinguishers have a low limit of the maximum allowable working pressure (8-12 atm.).

In addition, such vessels are subject to mandatory examination after a certain period of time in the relevant authorities. If you still take a fire extinguisher vessel under the receiver, then vessels from under carbon dioxide systems can be considered an acceptable option.

Finally, the most important point. Such structures, in fact, should be registered with the Rostekhnadzor authorities, since the assembly contains a vessel operating at a pressure of more than 0.07 MPa (the operating pressure of the installation is 10 atm.).

Owners of unregistered home-made air compressors may well be held liable (administrative and even criminal), as soon as something extraordinary happens during the operation of the equipment with a threat to human life and health.

So it’s worth thinking a thousand times before trying to assemble an air compressor from a refrigerator compressor with your own hands.

The practice of assembling a compressed air installation

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