The question of how to cut a compressor from a refrigerator most often arises among those who sell non-ferrous and ferrous scrap. The sealed housing of the unit hides valuable metals inside, such as copper and aluminum, the cost of which at collection points is much higher than that of ordinary steel. However, a seemingly simple procedure requires strict adherence to safety precautions, since there may be technical oil and residual refrigerant pressure inside.
Before starting cutting, it is necessary to completely empty the device of liquids and gases to avoid ignition or the release of toxic substances. The disassembly process requires the use of specialized tools, since the body is made of durable steel that is resistant to corrosion. Ignoring safety rules when working with an angle grinder can lead to serious injuriestherefore, preparation of the workplace is a primary task.
In this article we will analyze in detail all stages of preparation and immediate cutting, paying attention to the nuances that beginners often miss. You will learn how to correctly identify internal components and separate them as efficiently as possible for further delivery. Remember that high-quality sorting of metals increases the final profit from recycling old equipment.
Preparation of the workplace and necessary tools
To perform the work successfully and safely, you will need an equipped space with good ventilation. An ideal option would be a garage or an open area in the fresh air, where the accumulation of oil vapors and metal dust is excluded. The surface must be stable, and you must have a fire extinguisher nearby in case of an unforeseen fire.
The main tool for cutting will be angle grinder (grinder) with metal discs with a thickness of at least 2.5 mm. Thin cutting wheels can quickly wear down or break when working with thick housing walls, creating the risk of flying splinters. You will also need:
- 🛠️ A set of wrenches and pliers for dismantling external pipes.
- 🧤 Thick protective gloves and goggles to protect your eyes from sparks.
- 🗑️ Container for collecting used technical oil.
- 🔨 Hammer and chisel for final disassembly of internal elements.
It is important to make sure that the disk on the grinder is securely fixed and the protective cover is installed in the correct position. Working without safety glasses is strictly prohibited, since it is metal the chips fly at great speed. If you are using an electric tool, check the integrity of the cable and the presence of grounding in the outlet.
☑️ Checking readiness for work
Safety precautions and precautions
A refrigeration compressor is not just a piece metal, but a complex device that could work for years under high pressure. Before starting any manipulations, you must make sure that the unit has been disconnected from the power supply at least 24 hours ago. This will allow the condensation to settle and reduce the risk of a short circuit if the wiring inside the case is accidentally damaged.
⚠️ Attention! There may be residual freon pressure inside the compressor. When the body is heated by the grinder disc, the pressure will increase sharply, which can lead to an explosion. Before cutting, be sure to drill a hole in the upper part of the housing to vent gases.
The industrial oil inside is a toxic petroleum product. If it comes into contact with the skin, it can cause irritation, and when burned, it emits acrid smoke. The flash point of oil vapor is about 200 degrees Celsius, so sparks from an angle grinder can easily ignite the vapor if handled carelessly.
Work in a well-ventilated area or outdoors. If you are performing the operation in a garage, open the gate and create a draft. Smoke from burning oil and paint from the body is harmful to the respiratory tract, so using a respirator would be a reasonable protective measure.
Draining technical oil and relieving pressure
The first stage of preparation for cutting is removing the contents. The compressors are sealed and the oil is located at the bottom of the housing. To drain it, you need to turn the unit over or carefully drill a hole in the bottom. Be prepared for the fact that the oil may have a specific odor and dark color.
The draining process is best done over a wide container to prevent splashing. If the compressor is old, the oil may be thick and viscous, so the procedure should be carried out in a warm room or by preheating the housing (in a safe way, for example, with a fan heater) to improve the fluidity of the liquid.
After draining the oil, you must make sure that there is no pressure left inside. To do this, you can slightly loosen the fastenings of the suction or discharge pipe, if they are accessible, or drill a hole in the upper part of the housing with a thin drill. A characteristic hissing sound will indicate the release of residual refrigerant.
| Compressor type | Approximate oil volume | Refrigerant type (historical) | Recycling features |
|---|---|---|---|
| Low temperature | 250-350 ml | R12, R134a | Requires careful draining of thick oil |
| High temperature | 150-250 ml | R600a (isobutane) | High fire hazard of gas residues |
| Inverter | 200-300 ml | R600a, R134a | Complex electronics, requires separate disposal |
| Piston (old) | 300-400 ml | R12 (Freon) | Refrigerant toxicity to the ozone layer |
Case cutting technology compressor
After the unit is freed from liquids and gases, you can proceed to the main stage. Cutting the housing it is best to do it along the equator, dividing the compressor into two halves. This will allow you to gain access to the internal winding and rotor without unnecessary effort.
Secure the compressor in a vice or ask an assistant to hold it securely with your foot (through thick shoes) to prevent displacement during operation. Start cutting from the top, gradually going deeper. Do not press too hard on the tool, allowing the disc to enter the metal on its own. Excessive pressure can cause the disc to jam and the grinder to jerk.
Move in a circle, taking short breaks to allow the disc to cool. If you smell a burning smell or see smoke, stop working and check to see if any oil has gotten on the disc. Cut line It should be level so that it is convenient to later remove the internal components.
In some models, the housing has reinforced ribs. In such areas, cutting may take longer. Use smooth movements without trying to cut through the metal with a jerk. This will ensure the cleanliness of the cut and the safety of your tool.
What to do if the disc is jammed?
If the disc is jammed in the metal, immediately release the trigger of the grinder. Do not attempt to jerk the tool free while the disc is spinning. Wait until it stops completely, remove the disk and inspect it for cracks before using it again.
Disassembling internal components and sorting metal
After opening the case, you will see the “filling” of the compressor: a stator with copper windings, a rotor and a shaft. The most valuable part here is copper. The stator windings are made of pure copper, which is highly valued at collection points.
To extract copper, it is necessary to free the coils from a set of electrical steel plates. Often they are tightly pressed or filled with varnish. Use a chisel and hammer to cut off one side of the coil and then knock out the copper on the opposite side. In some cases, it is easier to cut the stator into sectors.
- 🔸 Copper is the most expensive component, collect it in a separate container.
- 🔸 Aluminum - found in some modern models (wiring), it is lighter and cheaper than copper.
- 🔸 Steel - the stator housing and plates are sold as black scrap at the lowest price.
Don't forget about the motor shaft. If it is made of stainless or alloy steel, it can also be returned separately, although its weight is light. Plastic elements, if any (terminals, pads), should be separated and disposed of in an appropriate plastic container.
Waste disposal and environmental aspects
The recycling process does not end with the receipt of non-ferrous metal. The remaining oil after draining should not be poured down the drain or onto the ground. One liter of used oil can pollute thousands of liters of water. Collect it in a sealed container and hand it over to special hazardous waste collection points.
Metal shavings generated during the cutting process must also be collected. It can be mixed with oil, so it is better to put it in a separate bag or container for subsequent melting. Burning wire insulation to release copper is prohibited, since this releases dioxins - the strongest poisons.
⚠️ Attention! The legislation of many countries strictly regulates the disposal of freon-containing equipment. Although it is difficult to extract freon in domestic conditions without a vacuum pump, try to minimize its release into the atmosphere by making holes and allowing the gas to escape slowly, rather than evaporating it by heating.
Compliance with environmental standards is not only a legal requirement, but also a contribution to preserving the environment. Correct sorting of waste allows you to return resources to the production cycle, reducing the need to extract new minerals.
Frequently asked questions (FAQ)
Can it be burned insulation on copper to clean it faster?
Strongly not recommended. When insulation (varnish, rubber) is burned, copper oxidizes and loses value, becoming “burnt.” In addition, toxic smoke is released, which is harmful to health and nature. It is better to clean the copper mechanically.
Is it dangerous to open the compressor if the refrigerator was running on R600a gas?
Yes, it is dangerous. R600a (isobutane) is a flammable gas. Even in small quantities it can create an explosive mixture with air. Before cutting such compressors, you need to be especially sure that the gas is completely vented and that there are no sparks near the nozzles before starting work.
Which tool is best suited for disassembling the stator?
For disassembling the stator, a combination of tools is best suited: a grinder for cutting the frontal parts of the winding, a powerful chisel and a heavy hammer for knocking out copper. On an industrial scale, hydraulic presses are used, but at home, hand tools are sufficient.
How much does copper weigh in an average refrigerator compressor?
The weight of copper depends on the power and year of manufacture of the compressor. On average, from one household compressor you can get from 100 to 250 grams of pure copper. In old, heavy models, the output may be higher, in modern compact ones - lower.