Dismantling and dismantling the compressor often becomes necessary when disposing of old equipment or troubleshooting inside the unit. Many owners immediately take to the angle grinder, but this method generates clouds of toxic dust and sparks, which is dangerous at home. There are cleaner and more controlled methods that allow you to carefully open the case, preserving the integrity of the internal parts and avoiding contamination of the apartment.
The main difficulty is that the device case is a sealed welded one steel cylinder, designed for high pressure. Simply unscrewing will not help here, since the bolt heads are often cut off at the factory, and the seam itself is filled with sealant or sealed. However, using the right approach and a set of hand tools, you can overcome this obstacle without unnecessary noise and risk to health.
In this article we will look at proven techniques that will allow you to safely deal with a metal casing. You will learn what tools are really needed, how to prepare the workplace and what precautions should be taken to ensure that the process is successful. The main thing is patience and consistency of actions, and not brute physical force.
Preparation of the workplace and necessary tools
Before starting dismantling, it is necessary to organize the space. The work ahead is dirty, so it is best to do it in the garage, in the yard or on the balcony. If this is not possible, cover the floor with thick film or cardboard to collect metal shavings and residual oil. You will need a stable surface, such as a workbench or a durable table that you don’t mind getting dirty.
For the job you will need a specific set of tools, which many home craftsmen have. The main element will be a hacksaw for metal with a high-quality bimetallic blade that holds an edge for a long time. Also indispensable will be pliers, screwdrivers of different sizes and, possibly, a hammer and chisel for the final separation of the body parts.
Don't forget about personal protective equipment. Even though we're moving away from using an angle grinder, small metal particles and old oil splatters can get into your eyes or skin. Wear thick gloves and safety glasses. Also prepare a container for draining used compressor oil, which can be aggressive and require special disposal.
⚠️ Attention: Before starting any work, make sure that the compressor has been disconnected from the power supply for at least 24 hours. There may be residual pressure inside, which must be released carefully by piercing one of the copper tubes with an awl in a well-ventilated place.
Removing the compressor from the refrigeration unit
The first stage is removing the unit itself from the refrigerator. It is usually located at the bottom rear of the device. You will need to remove the protective cover, if there is one, and disconnect the compressor from the frame. The fasteners may be rusty, so stock up on penetrating lubricant in advance, for example WD-40.
Disconnecting copper tubes requires care. Do not pull them sharply, so as not to damage the capacitor or other elements of the system if you plan to use them in the future. Use side cutters or a pipe cutter to cut the lines at a distance of 10-15 cm from the compressor housing. This will give you a margin for manipulation.
The electrical part also requires attention. Remove the start and protection relays, as well as the terminal block. Often they are simply put on the contacts, but can be secured with clamps. Remember or take a photo of the connection diagram, although this is not critical for cutting metal, it will help you understand the structure of the unit.
After disconnecting all communications, the compressor can be removed from the rubber shock absorbers or metal studs. If the fasteners are stuck, they can be carefully cut off or knocked out. Now you have in your hands a heavy metal cylinder, ready for opening.
Technology for sawing the body with a hacksaw
The most accessible and safest method of opening a sealed case is using a hand hacksaw. This process is labor intensive, but it ensures that there are no sparks and minimal dust. You need to determine the cutting line, which usually runs along the equator of the cylinder, where its two halves are connected.
Start making cuts in a circle, stepping back about 1-2 cm from the weld towards the bottom or lid. Do not try to cut right through the metal at one point. Move around the circle, making shallow cuts every 2-3 cm, gradually going deeper. This will allow you to maintain the geometry of the blade and avoid jamming.
When the cutting depth reaches 2-3 mm around the entire perimeter, you can increase the pressure. Insert the blade into the groove and saw with more confident movements. If the hacksaw gets stuck, use a metal lubricant or simply remove the chips with a brush. It is important not to overheat the metal, although this rarely happens during manual work.
☑️ Preparing for safe cutting
In places where internal partitions or motor mounts are located, the metal may be thicker. This will require more time and effort. Some craftsmen use two hacksaws at the same time to speed up the process, but this requires skill in coordinating movements.
Alternative methods: chisel and file
If a hacksaw is not at hand or the metal is too hard, you can use the knocking out method. To do this you will need a sharp sharpened chisel and a heavy hammer. The essence of the method is to insert a deep groove along the weld line until the metal bursts under pressure.
Install the compressor vertically and begin striking with a chisel at an angle of 45 degrees along the weld joint. Move in a circle, deepening the furrow. This method is noisier and requires good physical training, but it is effective for old Soviet models with thick walls.
Another option is to use a large file. This is a very long way, but it allows you to control the process with high precision. With a sharpened file, you can grind off the weld, turning it into a thin bridge that can be easily pierced with a screwdriver. This method is ideal if you need to keep the insides perfectly clean.
⚠️ Attention: When using a chisel, there is a risk of metal fragments flying off. Be sure to wear safety glasses and thick, long sleeves. Keep the tool under control to avoid slipping and injuring yourself.
Removing Internal Components and Valuable Materials
Once you have gone around and almost separated the body, insert a heavy-duty screwdriver or chisel into the cut and twist it. The body should come apart. Inside you will see a submersible motor and valve system filled with oil. Be prepared for the fact that the oil may have an unpleasant odor.
The main value is the copper stator winding. To remove it, you often have to cut the steel plates of the core. Use an ax or heavy chisel to split the plate pack. After this, the copper wires can be easily pulled out and returned as non-ferrous metal.
There are also valuable metals inside in small quantities. In some models, the rotor may have copper or brass elements. The compressor shaft is made of high-quality steel, which can be used for various homemade products. The piston group is also of interest to radio amateurs and craftsmen.
What to do with used oil?
Used compressor oil should not be poured down the drain or onto the ground. Collect it in a plastic bottle, cap tightly and take it to a hazardous waste or used oil collection point. This will help preserve the environment.
Don't forget to inspect the internal cavity of the case. Sometimes you can find whole copper tubes or other elements that were missed during initial dismantling. Careful sorting will maximize the yield of useful material.
Table: Comparison of methods for opening a compressor
For the convenience of choosing a dismantling method, we will consider the main characteristics of each method. This will help you decide on the tool in advance, based on your capabilities and working conditions.
| Method | Required tool | Noise level | Risk of sparking | Time spent on the process |
|---|---|---|---|---|
| Angle grinder | Bulgarian, metal discs | Very high | High | Low (5-10 min) |
| Hacksaw for metal | Hacksaw, spare blades | Low | Absent | High (30-60 min) |
| Chisel and hammer | Chisel, hammer, mallet | Medium | Low | Medium (20-40 min) |
| File | Large file | Very low | Absent | Very high (60+ min) |
When choosing a method, consider not only the availability of tools, but also the location of the work. In a residential apartment, the noise of an angle grinder or the sound of a hammer can cause a conflict with neighbors, while work with a hacksaw will go almost unnoticed.
Safety measures and waste disposal
The final stage is the correct disposal of generated waste. Metal housing, copper, steel and plastic should be sorted. This is not only correct from an environmental point of view, but can also bring a small financial income when taken to a scrap metal collection point.
Pay special attention to the oil. As already mentioned, this is a chemically active substance that pollutes soil and water. Even a small amount of oil can spoil a significant amount of water. Therefore, collecting and handing over the oil is an obligatory step for the responsible master.
The workplace also needs to be put in order. Wipe off oil from tools and remove shavings. Metal dust caught in shoes can scratch the floor in your home, so be careful when leaving the work area. Wash your hands thoroughly with soap and water, using a brush to clean under your nails.
Following these simple rules will allow you to complete the compressor disassembly process efficiently and safely. You will have access to valuable materials without creating dangerous situations and without violating environmental standards.
Frequently asked questions (FAQ)
Is it possible to restore the compressor after such disassembly?
No, after opening the sealed housing by sawing or knocking out, restore it to factory condition sealing at home is almost impossible. Requires special equipment for welding and vacuuming. Therefore, such methods are used only for disposal or repairs that do not require maintaining tightness (for example, use as a pump).
How much copper can be obtained from one compressor?
The amount of copper depends on the power and model of the unit. On average, from a standard household compressor you can get from 300 to 700 grams of pure winding copper. In some powerful models, the output can reach 1 kg, but most often it is in the 0.5 kg range.
Is the oil inside the compressor dangerous?
Compressor oil itself is not highly toxic upon short-term contact, but it does contain metal wear products and chemical additives. May cause irritation or allergy in case of contact with skin. When heated or burned, it releases harmful substances. Avoid getting oil on your skin and eyes.
Why disassemble the compressor at all if there are collection points?
Reception points often accept the entire equipment at the price of ferrous metal, ignoring the non-ferrous metal content. Self-disassembly allows you to sort copper, aluminum and steel, which can increase profitability by 2-3 times. In addition, this is the only way to check the insides or use parts for homemade projects.