Old, out of order or simply obsolete refrigerator is often sent to a landfill entirely, although a real technical treasure is hidden inside it. Compressor is the heart of the unit, which, even after discarding household appliances, retains its functionality and can serve for years. Many home craftsmen and professionals know that this unit is capable of performing many useful tasks if you correctly approach its removal and adaptation.
Before starting to implement projects, you need to understand that refrigeration compressor is not just an engine, but a complex one sealed mechanism operating under high pressure. Inside the housing there is oil, which cannot simply be poured down the drain, and refrigerant, which requires careful handling. However, if you decide to give the device a second life, a wide range of possibilities for creativity and practical use in the garage or workshop opens up before you.
In this article we will look in detail at how to safely dismantle the unit, what tools will be needed to connect it, and what original homemade products you can create. You will learn about the nuances of working with freon and oil, and also understand why this motor is so valued among DIY enthusiasts.
Assessing the condition and preparing for dismantling
The first step in any recycling or conversion project is diagnostics. Not every motor from refrigerator is suitable for further work. If the unit burns out or jams due to mechanical damage to the piston group, it can only be used as a donor of copper scrap. You can check the functionality by connecting the device to the network for a short time: a working motor should emit a characteristic hum and create a noticeable air flow at the outlet.
When storing the removed motor for a long time, ensure the integrity of the pipes. It is also worth considering that modern inverter models may require complex electronics to start, while older linear compressors start directly through a start relay.
⚠️ Attention: Before starting any disassembly work, make sure that the refrigerator is unplugged for at least 2 hours. This is necessary so that the refrigerant settles in the condenser and you do not get burned when the system depressurizes.
For successful dismantling you will need a minimum set of tools: wire cutters, pliers, a screwdriver and, possibly, a hacksaw. Copper tubescoming from the compressor are usually soldered, so they are often cut or sawed through, leaving a reserve for future strapping. The main thing is not to damage the motor housing itself and the electrical terminals.
Necessary tools and materials for conversion
To turn an old compressor into a functional device, one motor is not enough. You will need to assemble a certain set of components that will ensure safety and ease of use. The main element will be the receiver - a container for storing compressed air, the role of which is often played by an old gas cylinder or fire extinguisher.
In addition, we must not forget about the filtration system. It is necessary to install oil separators fine filters at the air inlet and outlet, especially if you plan to use the device for airbrushing or inflating tires. The presence of moisture and oil in the output stream can damage the painted surface or the mechanism of the pneumatic tool.
☑️ Checklist for compressor assembly
The table below shows the main components, which may be needed to create a full-fledged compressor installation:
| Component | Function | Importance |
|---|---|---|
| Receiver | Air accumulation and pressure stabilization | Critical |
| Pressure switch | Automatic motor on/off | High |
| Check valve | Preventing reverse air flow | High |
| Manometer | Visual control of pressure in the system | Medium |
Connection diagram and electrical part
Connection electric motor from the refrigerator requires an understanding of the operating principle of the start relay. Unlike conventional motors, it uses an asynchronous motor with a starting winding, which turns off immediately after reaching speed. If you connect the windings incorrectly, the motor will hum but will not start, which will quickly lead to overheating.
The terminal box is usually located on the compressor housing. Inside you will find three pins: common, start and working. They can be determined using a multimeter by measuring the resistance between pairs of contacts. The greatest resistance will be between the starting and working terminals, and the least - between the working and common terminals. The connection diagram is often indicated on the relay itself or on a sticker next to it.
The nuances of the starting relay
The starting relay is a device with a coil and a moving contact. When voltage is applied, current flows through the starting winding and the relay coil. The magnetic field pulls in the core, closing the contacts. When the motor picks up speed, the current drops, the magnetic field weakens, and the contacts open, turning off the starting winding. If the relay is faulty, the motor may not start or work with overload.
To automate the process of operation of a homemade compressor, it is necessary to implement pressure switch. It breaks the power circuit when the pressure in the receiver reaches a predetermined maximum, and closes the circuit when the pressure drops to a minimum. This prevents the motor from running idle and protects the system from overloads.
Idea 1: Compressor for airbrushing and painting
One of the most popular uses of a decommissioned motor is to create a quiet compressor for airbrushing. Unlike loud piston compressors, refrigeration unit operates almost silently, which is critical for indoor artistic work. The pressure of 2-4 atmospheres that it produces is quite enough for working with paints and varnishes.
The key point here is the air quality. Airbrushing requires air that is dry and free of oil, so the filtration system must be multi-stage. Silica gel filters and dehumidifiers are often used. It is also important to install reducer to accurately regulate the outlet pressure, since fine work requires a stable and low pressure.
Ready the unit can be mounted on a wooden platform or a metal frame with wheels for mobility. Don’t forget about vibration isolation: place rubber pads under the motor feet so that vibration is not transmitted to the table and the master’s hand does not shake during work.
Idea 2: Inflating tires and pneumatic tools
If you are not interested in creativity, the compressor can be used for more mundane tasks, such as inflating cars or bicycles tires The standard tire pressure for passenger cars is about 2.0-2.5 atmospheres, which is easily achieved with a conventional refrigeration compressor. This eliminates the need to go to a gas station or carry heavy foot pumps.
For working with pneumatic tools (for example, a wrench or a grinder), one motor from a household refrigerator may not be enough due to its low performance (displacement). However, for blowing parts, cleaning a computer from dust, or working with a small paint sprayer, its power is quite enough. The main thing is to let the motor cool down, since it is not designed for continuous operation for hours.
⚠️ Attention: Do not use ordinary plastic hoses to connect to the pressure receiver. Use only specialized fabric-reinforced pneumatic hoses to avoid rupture and injury.
In addition to the system, you can add quick-release connections, which will make working with the tool quick and convenient. Such a mini-station in the garage will become an indispensable assistant for any motorist.
Safety and precautions
Working with pressure and electricity always carries risks. Receiverused in a homemade compressor is a pressure vessel. If you use an old gas cylinder, it must be properly prepared: completely remove the remaining gas, burn it out and, preferably, fill it with water to check for leaks before using it under air.
Temperature conditions also require control. During operation, the compressor housing can heat up to 90-100 degrees Celsius. Therefore, the installation must have good ventilation, and ideally, forced cooling or at least a perforated casing. Do not allow the motor to operate in a confined space without air flow.
When disposing of residues Freon and oil, follow environmental standards. Do not release gas into the atmosphere or discharge industrial oil into the soil or sewer system. Hand over waste materials to special collection points, as they are hazardous waste.
FAQ: Frequently asked questions
How many atmospheres can a compressor from a refrigerator produce maximum?
Theoretically, the piston group can create a pressure of up to 10-15 atmospheres or more, but in practice everything is limited by the strength of the compressor housing and engine power. Standard operating pressure for domestic needs is 2-6 atmospheres. Exceeding this value can lead to rupture of the housing or tearing off the cover.
Is it necessary to change the oil in the compressor during refurbishment?
In hermetic compressors, changing the oil is not provided for by the design and is extremely difficult. Typically, the oil is changed only if it turns black from overheating or burning, which indicates a serious malfunction. For new tasks, they use the same oil that is located there, installing external oil separators.
Can the compressor be used outdoors in winter?
It is not recommended to use it at subzero temperatures. The oil inside thickens, making it difficult to start and lubricate rubbing parts. In addition, moisture may condense in the receiver, which will freeze and block the valves. If work outside is necessary, organize a warm box or canopy.
Why does the compressor hum, but does not start?
Most likely, the problem is in the starting relay or capacitor (if it is in the circuit). The piston could also be jammed due to lack of oil or dirt. Sometimes a careful start with a “kick” (short-term supply of voltage) helps, but this is a temporary measure.