How much copper is in a compressor from a Soviet refrigerator: calculation of metal yield

The question of the content of non-ferrous metals in old household appliances often arises among those who recycle electrical appliances or want to hand over the unit to scrap metal Soviet refrigerators are valued for their build quality and the use of natural materials, unlike modern plastic analogues. However, many mistakenly believe that each compressor contains several kilograms of pure copper, which is not true.

In fact, the process of extracting metal is more complicated, and the yield of useful raw materials depends on the specific model and year of manufacture. Motor-compressors from the time of the USSR, such as KhK, KhKM or later FC, have different winding designs. To understand the real value of the unit, it is necessary to consider its internal structure and the technologies of that time.

In this article we will look in detail at how much copper can be obtained during disassembly, what tools will be needed and whether the gamble is worth the candle. Exact data will help you avoid disappointment when weighing scrap.

Design of motor-compressors during the USSR

Soviet compressors were hermetically sealed units, where the electric motor and piston group were placed in a single steel casing. Inside were stator windingsmade of copper wire and a rotor. It is the copper in the windings that is of interest for delivery, and not the heavy steel casing.

The weight of the unit itself could reach 10-12 kilograms, but the lion's share of this weight accounted for steel and cast iron. Electric motor occupied only part of the internal volume. Designers of that time strived for reliability, so they used thick wire, but its quantity was strictly regulated by the power of the engine.

It is important to understand that it is almost impossible to remove copper without damaging the windings. Usually, during disposal, the housing is simply sawed or punched to get to stator group.

Unlike modern models, where aluminum is often used, in Soviet technology it was used pure electrical copper, which increases the value of scrap.

⚠️ Warning: There is compressor oil inside the compressor, which may be toxic. When sawing the housing, take precautions and do not allow liquid to get on your skin or eyes.

The secret of marking

Soviet compressors often had markings indicating the type of refrigerant and power. For example, the letters "F" stood for freon, and the numbers indicated the volume of the chamber. This helped craftsmen select the correct replacement, but had almost no effect on the amount of copper inside.

Factors affecting the yield of non-ferrous metal

The amount of copper that you will receive at the output is not a constant value. It directly depends on motor power and year of production. Early models, released in the 50s and 60s, were often more massive, but this did not always mean more copper - the strength margin of the steel increased.

The key factor is wire cross-section windings. For powerful refrigerators designed for large chambers or freezers, larger diameter wire was used. However, the number of turns could be less, which would equalize the total weight.

It is also worth considering the condition of the unit. If the compressor was rewound in Soviet or post-Soviet times, it may contain aluminum or a wire of a smaller cross-section, which drastically reduces the cost of scrap.

The dimensions of the refrigerator also play a role: in two-chamber models ZIL or Biryusa often there were more efficient motors than in single-chamber "kriushes".

Average weight of copper in popular models

Let's consider specific figures obtained by an experienced by disassembling various models. The data are averaged, since the manufacturer could make changes to the design in different years.

The most common compressors of the series HC (Refrigeration Compressor) and their modifications contained from 100 to 200 grams of copper in the stator. This quantity was enough for reliable operation, but it is not economically feasible to hand them over one at a time.

More powerful units installed in refrigerators Biryusa or Saratov models could contain up to 250-300 grams of color metal However, the weight of the “pancake” itself (steel body) remained significant.

As can be seen from the table, copper yield is less than 2% of the total mass of the unit. The bulk is made up of ferrous metal, which is also accepted, but costs much less.

Technology for extracting copper from stator

In order to extract copper, it is necessary to destroy the sealed casing. The easiest way to do this is with an angle grinder (“grinder”) or a sledgehammer. The first stage is cutting the dome or punching a hole in the upper part of the case.

After opening it becomes visible stator with a wound wire. To extract copper as cleanly as possible, many burn the insulation, but doing this outdoors is prohibited by environmental regulations and is dangerous to health due to toxic smoke.

A safer, but more labor-intensive method is mechanical cutting. The stator is clamped in a vice, and the wire is cut out with a chisel or cut out with a hacksaw on one side, and then knocked out on the other.

When using thermal method (heating with a burner), you can melt the varnish and quickly release bundles of wire, but the quality of the copper may suffer, and receivers may lower the price for “burner.”

Economic feasibility of disassembly

Is it worth spending time and effort on extracting copper from one compressor? If you recalculate the cost of 200 grams of scrap at current prices, the amount will be insignificant. It is much more profitable to hand over whole compressors as is, if the collection point takes them by weight as a “mix” or electrical equipment.

However, if you have accumulated a whole batch of old equipment, for example, when cleaning a summer house or garage cooperative, then self-cutting can increase your profit by 20-30%. Ferrous metal also has value, and its weight makes up the bulk of the cargo being delivered.

Do not forget to take into account the depreciation of the tool and the cost of electricity or fuel for the generator if the work is carried out in the field.

⚠️ Caution: Burning wire insulation to obtain copper results in the formation of dioxins and severe environmental pollution. Use mechanical extraction methods or specialized ovens with filtration.

Where and how to hand over compressors is profitable

It is best to hand over scrap to specialized collection points that are licensed to work with non-ferrous metals. Avoid dubious “practices” in yards where scales may be set incorrectly.

Check before your trip price list. Often the price of “copper in the engine” and “pure copper” differs significantly. If you are not planning to disassemble, find out the tariff for “electric motors assembled.”

For large volumes, it makes sense to call reception point to the location of the equipment, since transporting heavy cast iron in a passenger car can be inconvenient and costly.

Remember that fair weight and transparent conditions are the key to a successful transaction. Weighing should take place in front of you, on proven scales.

Is it possible to find palladium or platinum in a Soviet compressor?

Ordinary household compressors of ZIL, Biryusa or Saratov refrigerators do not contain precious metals (palladium, platinum, gold) in significant quantities. Relay contacts may contain silver, but the amount is negligible. The main value is the copper of the windings.

Why is copper black in some compressors?

The black color of copper indicates overheating of the windings during operation or that the wire was subjected to heat treatment (burnout) during handicraft disassembly. Such copper is called “zhzhenka” and is valued lower.

How much does an entire Soviet refrigerator weigh?

The weight of a Soviet refrigerator depends on the model. Small “kriushis” (ZIL) weighed about 30-35 kg. Standard two-chamber models (Biryusa, Atlant of the Soviet years) could weigh from 60 to 80 kg. The main mass is the steel body and thermal insulation.