Air compressor from refrigeration compressor. How to make a compressor from a refrigerator

A homemade refrigerator compressor is most often used in tandem with an airbrush or spray gun, since it works almost silently, takes up little space and creates sufficient air pressure. It is also suitable for pumping up the wheels of a car. Next, we will tell you how to make a compressor yourself.

Materials and tools for a homemade compressor from the refrigerator

Compressor. The motor from the old refrigerator is called the compressor, it is the central element of our product. How it looks can be seen in the photo: details different models may differ, but are generally similar to each other. The compressor is supplied with a start relay (black box attached to the side), from which a power cable with a plug comes out.

Receiver. The container into which the air will be pumped by the compressor. Here options are possible: any tight-fitting container with a volume of 3 to 10 liters made of iron or plastic is suitable. This can be an empty fire extinguisher, small tanks, various receivers from trucks, cans from construction fluids.

Hoses. You will need three lengths of hose. Two 10 cm long and one 30-70 cm long, depending on the shape of the receiver and the intended mount. It is convenient to use fuel hoses in a car as they will connect to car filters.

You will also need one hose or tube to connect a ready-made homemade compressor from the refrigerator to the air consumer itself. Here the length, the material depends on the specific needs. If you will be using a compressor with an airbrush, any thin PVC hose (or the one that comes with the airbrush) will do. When using the compressor outdoors, look for a thicker hose.

Clamps. 5 pieces, size 16 or 20 mm.
Tubules. Two pieces - copper or iron, 6 mm in diameter or others - the main thing is to fit the hoses.
One is 10 cm long, the second is 20-50, depending on the size of the receiver, more details below.
Automotive fuel filters. One petrol and one diesel.
Pressure gauge (optional).
Epoxy resin if using a plastic receiver.
Piece wooden board(the foundation). The size depends on the size of the receiver and the motor. They should fit on the board next to each other.
Steel tape or wire. It is needed to fix the receiver.
Self-tapping screws for wood.

Tools:

Sharp knife
Screwdriver
Drill
Pliers.
Metal file (optional).

How to make a compressor yourself

Now directly on how to make a compressor with your own hands.

Three tubes come out of the compressor from the refrigerator: two open and one short, sealed. Plug the compressor into a power outlet and slide your finger near the tubing outlets. The one from which the air blows will be the exit, and the one that draws in will be the entrance. Remember which one is and unplug the compressor. Use a metal file to cut two tubes, leaving 10 cm or more to connect the hoses conveniently. You can bite off with pliers, but you need to make sure that the sawdust does not get inside the tubes. Next, we fix the compressor on the base board, screwing the legs with self-tapping screws (you can use bolts, this is more reliable). Important: we fix the compressor in the same position in which it was fixed in the refrigerator. The fact is that the starting relay on the motor works due to the forces of gravity, on the relay case there is an arrow pointing up. Having secured the compressor, go to the receiver.

Making a receiver. Option if you have a plastic container. We drill two holes in the lid for our tubes. We insert them there, as shown in the figure, and fasten with epoxy resin. On top we leave the ends 2-4 cm long. Now about the length of the tubes. Short (10 cm) will be the day off. The second will be the entrance, we make it as large as possible so that it does not reach a few centimeters to the bottom of the receiver. This is done in order to space the inlet and outlet openings inside the receiver as much as possible for greater air mixing.

If you have an iron receiver, we do the same, but do not glue the tubes, but solder or weld on. You can also weld the nuts, and then screw the fittings under the hoses into them.

The pressure gauge can only be installed in a metal receiver. To do this, we drill a hole in any convenient place on the receiver and solder a pressure gauge in it. A more preferable option: weld a nut onto the hole and screw the pressure gauge into the nut. So in case of failure of the pressure gauge, you can easily replace it.

Now we take a piece of hose (10 cm) and put it on the gasoline filter. If you use hoses for gasoline, then there should be no problems, if you use polyvinyl pipes, then you may have to heat it with a match or hold it in boiling water so that it fits on the filter fitting. We put the other end of the hose on the inlet tube of the compressor. This inlet filter is needed to filter out dust. Here, the use of clamps is not necessary on the connections, since there is no pressure here.

We take the second piece of hose and connect it with the outlet tube on the compressor and the inlet tube on the receiver. We put clamps at the joints.

Now we put the third piece of hose (10 cm) on one end of the receiver outlet tube, and put the other end on the diesel filter. We put on the clamps. An arrow is drawn on the filters (diesel and gasoline) indicating the correct direction of travel through the air filter. Connect both filters correctly. A diesel outlet filter is needed to filter water from the air.

On the outgoing fitting of the diesel filter we put on our working hose going directly to the airbrush, spray bottle, etc.

We fasten rubber feet on the underside of the base board or glue felt pads for furniture. If this is not done, the compressor may scratch the floor during operation - it vibrates. Vibration and noise levels depend on the model of the refrigerator compressor you purchased. Motors from imported refrigerators are almost inaudible, Soviet ones are also quiet, but there are exceptions.

The generated pressure also depends on the model. Ancient motors are more powerful. Most Soviet compressors are capable of pumping pressure up to 2-2.5 bar. The compressor in the photo generates a pressure of 3.5 bar.

Servicing a homemade compressor from the refrigerator

Compressor maintenance consists of regularly changing both filters and draining any accumulated oil in the receiver. But the main factor affecting compressor life is the frequency of oil changes. The first time it is better to change it before assembling the compressor. The motor has a third sealed tube. Cut off the sealed end from it and drain the oil from it by turning the motor over. Pour out about a glass of oil. Now fill in fresh with a syringe through the same tube. motor oil, a little more than the amount that was drained.

Then, in order not to seal the drain tube, we screw a bolt of a suitable size into it. At the next oil change, simply unscrew the bolt.

The industry currently offers a selection of compressors it manufactures. True, the assortment is not too big. And there are a lot of disadvantages of such units. Therefore, you might think that a homemade compressor from a refrigerator is completely devoid of such disadvantages. And what - very much can be!

Compressor materials

In order to independently make a compressor for the refrigerator, you will need nothing at all. But the main component of homemade refrigeration compressor a unit from a conventional refrigerator will come out.

In addition, you will need:

Car air filter that can work perfectly under any pressure
A bypass valve, combined with a check, designed for a pressure of 6 atmospheres and usually used by plumbers
Any synthetic hose capable of withstanding a pressure of 6 atmospheres
Copper connecting tubes
Make a storage tank called a receiver. Moreover, the volume of the receiver should be provided so that the larger it is, the less often the equipment will be put into operation.

Remember that the accumulated air pressure in the receiver decreases as it is consumed. If the equipment will be used only for pumping tires, where the maximum allowable pressure should not exceed 3 atmospheres, then this is not very critical. But if the unit is designed to work with a pneumatic tool, then this can be very critical.

Where to begin?

And to start, as they say, must be from the beginning. Namely - to make a tank. Its design should provide for 3 branch pipes:

Day off
Input
Designed for draining condensate

Helpful hints:

When installing the compressor from the refrigerator with your own hands and the tank itself, the drain pipe must be located strictly at the bottom so that the condensate drains off without problems. There may be a slight problem with the unit itself. That is, he sometimes "wants" to get rid of the oil. To prevent this from happening, the outlet pipe must be bent upward at a certain angle.

By the way, the inlet pipe must also be bent up in the same way, putting on a rubber tube, the other end of which is connected to the air filter
The bypass valve is required to prevent air from flowing backwards. In addition, when the pressure reaches the maximum limits (more than 6 atmospheres), it will simply open and poison excess air
As for the reliability of the unit, it is usually capable of producing at least 15 atmospheres, so there is no need to doubt its reliability. For safety reasons, it is recommended to screw in a shut-off valve at the outlet of the receiver, which can be any plumbing valve. While the receiver is filling with air, the tap can be turned off. As a matter of fact, the design of a home-made receiver can be absolutely any and is limited exclusively by the imagination of the most home-grown "designer"

As storage tank(receiver), craftsmen usually use used receivers from the KAMAZ brake system, since it already has all the necessary fittings. If there is no way to find an old "KAMAZ" receiver, you can make it from an old fire extinguisher. But know that in this case you will have to work hard to weld the fittings and pipes correctly
Some people try to avoid using a lot of connecting tubes. However, such work is immediately doomed to failure. Most good operational results showed oxygen hoses used in welding, but their weight is quite large, and a compressor with such nozzles is not very convenient to use
To start the finished assembled compressor into operation, provide a compressor start relay and add a switch

The refrigeration compressor itself is recommended to be made on a frame and only on rubber cushions. If possible, it is advisable to install a pressure gauge in series with the check valve to monitor the pressure. Although, in practice, craftsmen often act differently: they install a pneumatic pressure switch designed to disconnect the unit from the network. If such a valve is correctly adjusted, then the unit will shutdown at the lower and upper thresholds of the pressure value.
It is also a good idea to provide an overheat shutdown relay so that accidental overheating of the equipment does not destroy the fruitful results of your work.

What happens: general view of the compressor

In general, the scheme of a self-assembled and working compressor is planned as follows:

The refrigeration compressor draws in outside air through the air filter and branch pipe.
A bypass valve is installed at the end of the inlet hose
There is also a control valve at the outlet of the tank.
A hose is connected to the control equipment itself, ending with a pneumatic gun

In principle, making a refrigeration compressor yourself is cool. True, such work should be started only after all the necessary structural elements are already at hand.

A portable air compressor, low noise, consuming relatively little electricity, is probably the dream of every owner of a private house, summer house, garage, small business. Well, it is quite permissible 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 the refrigerator compressor,.

Before deciding on the implementation of an idea, it is advisable to decide 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:

not intended for use with air.
The compressor performance of domestic refrigerators is low.
A special oil is required to lubricate the mechanism of refrigeration compressors.

The corresponding conclusions follow from this. When working with an air environment, the device will not be able to function for a long time without good cooling.

When a refrigeration compressor operates with freon, the case is cooled due to other temperature parameters of the refrigerant.

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

Burned-out compressor of the refrigerator as a result of violation of technological modes of operation. The same fate awaits the device that is supposed to be used in the project, if not applied special means protection

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

For example, to pump 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 even enough to pump up a car wheel in one sitting or paint one wall of a small garage with a spray gun.

Poor performance of the refrigerator system is common in this kind of technology. But for an air compression system, especially with a high flow rate, a high-performance system is required

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

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

DIY design

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

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

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

Air receiver.
Oil separator.
Differential pressure switch.
Copper tube.
Input air filter.
Shut-off control and control valves.

A compressed air cylinder from a KAMAZ vehicle is optimally suited for the air receiver. The five-liter container has dimensions that are acceptable for a domestic environment and meets 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 Rostechnadzor standards

A variant of the oil separator design, which is recommended for use in the installation. For reliable operation of the system, high-quality separation of oil from air is required.

Differential pressure switches (for example, from the PT series) are used from those used in industrial refrigeration plants.

A sufficient amount of copper tube is available in the construction of the condenser of a household refrigerator. It fits in diameter to the outlet of the refrigerator compressor.

Compressor inlet air filter is easy to make from any suitable plastic container by placing an ordinary foam sponge inside. Shut-off control and control valves - valves, check valve, pressure gauges - you can buy in the store.

Air unit assembly

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

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

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

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

The air filter can be easily made from any plastic container by attaching it through an angle threaded transition to the inlet.

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

A tee and (compressed air outlet) are installed at the outlet of the receiver. Through the taps of the tee, the receiver outlet is additionally communicated with copper pipes with a differential relay and a pressure gauge. It is also placed there 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 was powered from the alternating current network through the starting relay, so this option is left unchanged.

Another question is that you can slightly upgrade the circuit. For example, it can be supplemented with a switch installed on the body of the assembled unit. Still, this option is more convenient than periodically plugging-unplugging the plug from the socket every time the device is used in business.

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

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

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

Some project notes

A fire extinguisher under the receiver for a home compressed air unit must be selected taking into account a threefold pressure reserve. Powder OT bottle is not the best choice

Often, fire extinguisher cylinders are used as a receiver for self-made projects. Meanwhile, the capacity of powder fire extinguishers has a low limit of the maximum allowable operating pressure (8-12 atm.).

In addition, such vessels are subject to mandatory certification 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 Rostechnadzor authorities, since the assembly includes a vessel operating under a pressure of more than 0.07 MPa (the operating pressure of the installation is 10 atm.).

The owners of unregistered self-made air compressors may well be brought to justice (administrative and even criminal), if something extraordinary happens during the operation of equipment with a threat to human life and health.

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

Practice of assembling a compressed air installation

Tags:

With the help of improvised tools and a standard set of household tools, any householder can assemble a homemade air compressor from the refrigerator. The field of application of such an apparatus is wide enough and justifies the expenditure of manpower and resources for its manufacture:

Air compressor for airbrushing and painting.
Electric pump for inflating car tires.
Power source for pneumatic tools.
Air pump for purging complex mechanisms during their repair.

Homemade air compressor from the refrigerator

The range of possibilities, power, durability and reliability of a home-made compressed air generation system, assembled on the basis of a compressor from an old refrigerator, depends on the correct design and installation of its elements.

Compressor selection problem

Compressor from an old refrigerator

The assembly of a functional and reliable device begins with the selection of its main part - the compressor. It is available in any household refrigerator, serves as a pump for pumping refrigerant and is a single unit in a sealed metal shell, from the outside of which a relay is attached to start it. Any similar motor in good working order is suitable for solving the problem. Further selection and configuration of all additional structural elements is determined by the shape and characteristics of a particular device.

Compressor search

If you do not have an old and unnecessary refrigerator at hand, then there is always the opportunity to purchase a dismantled unit on the market for used tools and spare parts. There you can buy a workable version for 100-150 rubles.

Dismantling the compressor with your own hands from the refrigerator

Removing the device from the refrigerator can be done with the usual wrenches and screwdrivers. It is better to bite the air supply and outlet pipes, and not saw off, so as not to clog the mechanics of the apparatus. The standard start relay is also dismantled.

Features of refrigerators and their compressors

The capabilities and characteristics of the compressor chosen as the basis for the future compressed air supply mechanism should be taken into account. There are the following options:

The simplest solution is linear motors.
Inverter motors.

Both options are suitable for work, but their features should be taken into account. Linear machines are designed for constant working speed. Therefore, they are better suited for creating a compressor apparatus. Converter versions are designed for variable speed, which must be reduced depending on the signal from the temperature sensor.

Functional check

Checking the performance of the compressor from the refrigerator

In order to check the unit's performance, you should first ring it with an electronic resistance meter, and then connect it to the network:

Each input pin is checked. Usually there are 3 of them on the block, configured for a standard relay connector.
Contact with maximum resistance refers to the motor starting mechanism (approximately 20-40 ohms)
Contact with a resistance of 10-15 ohms refers to the winding providing the operating mode (the wire on its winding is thicker).
The third contact is phase contact.

For a test connection, voltage is applied to the working and phase contacts, after which the working and start contacts are briefly closed. The device should create a stable tone of sound when turned on, and an air flow should come out of the output tube.

Compressor station layout development

Preparation of equipment for a homemade compressor station

When developing a compressor station diagram and compiling a list additional equipment the intended area of application should be taken into account. The larger the receiver and the pressure in it, the wider the possibilities for homemade products will be. The standard scheme includes the following parts and mechanisms:

Electronic pressure sensor. It shuts off the engine when it reaches given parameters pressure in the receiver.
Pressure gauge for measuring the degree of air compression.
Safety valve.
Air dryer exiting the receiver.
Air filter for installation on the inlet pipe of the compressor block.
Filter for cleaning the air jet under pressure from oil.
Switch button.
Wires, hoses high pressure and a fitting with the required configuration.
High pressure cylinder for receiver.
A ball valve that cuts off the air supply to the consumer at the outlet from the system.

Equipment acquisition methods

An old refrigerator compressor can be bought inexpensively in the used tool market

Most compressor station parts are easiest to buy at a plumbing store. There are specialized sites where all parts, without exception, can be ordered in a few clicks. Much less expensive equipment can be obtained from the used tool market. It is permissible to use cheap fuel filters, but with the help of a conventional fitting and a metal sponge for washing dishes, you can quickly make a more reliable filter for coarse air purification from oil, which is installed on the outlet pipe of the engine block.

Receiver problem

Homemade welded receiver

Cylinders for homemade compressor equipment cannot be found on sale. For this purpose, cylinders of various purposes and capacities are being converted under the receiver:

Propane and methane cylinders.
Fire extinguishers.
Cylinders for storing compressed air, carbon dioxide, oxygen and others.
Homemade welded structures.

Attention: When using self-made enclosures for the receiver, you must take into account the degree of risk and explosion hazard of such a device.

The simplest option is steel pipe medium diameter with sealed plugs. The receiver housing must contain at least 3 pass-through nodes:

Compressed air inlet from the compressor.
Outlet.
The condensate drain unit from the cylinder, which should be located at the lowest point.

When using steel cylinders, the inlet and outlet pipes are welded by welding. The enclosure must withstand more than 10 atmospheres.

Preparation and connection of the compressor from the refrigerator for use in the compressor installation

When connecting the compressor unit, you can leave the same circuit as it was originally provided - through the start relay. The pressure sensor wires can be connected to this relay, which will interrupt the circuit after reaching the calculated pressure parameters in the receiver. Additional amenities include equipping the entire system with a pushbutton switch and LED operation indicator. Before connecting to the block, you can change the oil. The old oil is designed to work with freon. Special compressor oil for work in air environment protects the electric motor from overheating and premature failure.

Installing the air filter on the air intake

Installing a fuel filter on the compressor inlet pipe from the refrigerator to clean the air flow

For landing on the inlet tube of the air filter, the most simple option which is a plastic fuel filter, both a soft rubber hose and a threaded metal elbow fitting can be used. The connecting soft tube, stretched over the plastic tip of the filter and the copper inlet, is easiest to crimp with a metal tightening clamp.

Installation of oil cleaning device

The air jet from the unit contains a significant amount of oil, which can be filtered out with a homemade cutter. In its housing, a drainage hole with a tap should be provided through which it can be cleaned. It is allowed to install a cooling coil made of a metal tube between the oil cutter and the compressor block.

Line with measuring and control equipment

Preparation for the assembly of the line with instrumentation for the compressor station

All control and measuring instruments the easiest way to place it on the same highway. This will require regular metal tees from a plumbing store. On a single platform, there is a sensor for turning off the system when the operating pressure is reached, a pressure gauge, a device for cleaning air from condensate accumulating in the receiver and a safety valve, with which you can quickly discharge excess air from the cylinder. A control ball valve can be located at the outlet of the line. The main unit is connected to the storage tank either through its standard inlet, or using a homemade inlet on its body.

Instrumentation connection problem

If the diameters of the installation instrumentation do not correspond to the size of the available fitting, then in this case all the devices can be mounted using plugs in which holes of the required size are drilled and the threads are cut with the appropriate pitch. Threaded connections are sealed with fum tape.

High pressure rubber tubing problem

Thick-walled oxygen hoses are one of the most available materials for connecting all parts of the compressor apparatus. But it should be borne in mind that the air stream when leaving the engine compartment will contain a large number of oil that destroys rubber. For this reason, it is preferable to use metal (copper or steel) tubing.

Serving a compressor from a DIY refrigerator

Maintenance of a home-made compressor station should be carried out taking into account the peculiarities of its configuration. The operability and tightness of all components should be periodically checked. Violation of the tightness of the locking devices is easy to detect if a pressure measuring device is installed, which will immediately show its rapid loss. The performance of the pressure sensor can be easily checked using a pressure gauge, the readings of which can be recorded at the time of a regular shutdown of the system after filling the air reservoir. You should also regularly drain condensate and oil from filters and cylinders.

A compressor is a multifunctional device that can be used for a variety of daily needs such as inflating car tires, painting, and the like. But due to the high cost of factory models, many owners think about self-assembly such a unit. The most common option for creating a compressor with your own hands is to use a refrigerator.

The advantages of a factory and homemade device

Before self-production air compressor from the refrigerator, you must compare it with a conventional factory sample. This will help you make the right decision.

Z Avoda and homemade devices have the following differences:

Limitations in the operation of motors

Not all refrigerator motors can operate under the same conditions. Some of them have their own 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 also combined modes, which include several ranges of operation.

Thus, homemade 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 back of the refrigerator. To remove it, you should prepare a set of basic tools: pliers, a set of keys and screwdrivers (curly and regular).

The compressor itself has two tubes that connect to the refrigerator's cooling system. They need to be bitten off with nippers or pliers. It is strictly forbidden to cut them off with a hacksaw for metal, since when sawing, small pieces of metal can get into the motor, which can lead to catastrophic consequences.

After that, you need to remove the start 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 upper and lower parts of the relay, so that later there will be 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.

Functional check

After disassembling the refrigerator and compressor, it is required to check the operability 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 this. First, 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 in the same position as it was before. Do not forget about the correct mounting of the relay. The 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 case. It is necessary to screw the wiring with a plug to them. The place where the connection will be must be wrapped at least with electrical tape in order to avoid electric shock. It is advisable to carefully solder the junction of the wires before doing this.

After that, plug the compressor into a power outlet and observe the unit's performance. 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 apparatus. It is necessary to mark from which tube the air comes out and which one it enters.

Step-by-step assembly instructions

Before starting work, you should prepare all necessary tools and materials. These kits may differ from each other depending on what the future owner of the compressor expects.

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

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

The receiver can be made of plastic, and nothing terrible 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 good tightness, and the hoses are closed at the same time. Moreover, only a manometer can be installed on a metal case.

To do this, a hole must be drilled in the receiver 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 ends on creating a homemade compressor from the refrigerator. Any materials can be used for painting, but first you can clean and prime to avoid corrosion. After that, you just need to attach the receiver to the base with a wire.

Some technical features

It is rather 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 even show top scores than new and factory ones. The most important thing is not how the device can be assembled, but how you need to take care of its condition.

Such work consists, as a rule, in the replacement of filters (gasoline and diesel), as well as the 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 is sealed at the end. She is responsible for draining the oil in the device. For service it is necessary to cut off the sealed part, drain the oil, fill in a new one and solder it back.

Is the compressor serviceable

As a rule, the relay must be ringed during repair. You also need to change the oil in the device. If the compressor still does not work, 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, an internal combustion engine with a supercharger can also be used as a starting material for a compressor. Thus, you can get a decent device with a lot of power. Moreover, the piston group is provided with a high power reserve. If you have the opportunity and desire, you can find it for a fairly low price in excellent condition. With this option, the ignition, intake and exhaust system must be removed. For his successful work sufficient lubrication of the pistons, cooling system and tightness.

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

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