When choosing new household appliances for the kitchen, consumers often pay attention to the design, volume of chambers or the presence of the No Frost function, forgetting about the most important thing - the “heart” of the unit. It is the quality and type of engine that determines how long the refrigerator will last, how much electricity it will consume and how quietly it will operate. Understanding what compressors are used in refrigeratorsallows you not to overpay for unnecessary functions and choose a reliable model.
The modern market offers many options, from classic piston models to the latest linear systems. Each type has its own unique design features, operating principle and production life. In this article, we will analyze in detail the design of various units so that you can take a balanced approach to purchase or repair.
The principle of operation of a compressor in a refrigeration system
The compressor is the main unit that ensures the circulation of refrigerant through a closed circuit of the refrigeration system. Its main task is to compress freon gas, increasing its pressure and temperature, after which the hot gas enters the condenser for cooling. Without this mechanical compression the heat exchange process would be impossible, and the products would not be cooled.
Most household models use an electric motor that drives the compression mechanism. This assembly is usually located at the lower rear of the case and is often covered by a black casing. It is here that the conversion of electrical energy into mechanical work necessary to maintain a low temperature inside the chambers occurs.
It is important to understand that the efficiency of the entire system directly depends on the tightness and performance of this unit. If the power is selected incorrectly or the mechanism is defective, the refrigerator will work with overload or will not be able to reach the set temperature.
⚠️ Attention: Any attempts to independently open the sealed compressor casing or disconnect copper tubes without special equipment will lead to irreversible damage and leakage of freon.Classic piston compressors
The most common type that can be found in old and budget models is a piston unit. Its design resembles a miniature internal combustion engine: a piston moves inside the cylinder, which builds up pressure. Such devices are highly reliable and maintainable, which has made them popular for many decades.
The main advantage of piston systems is their ability to create the high pressure necessary for efficient operation even in hot climates. However, they also have a significant drawback - a high level of vibration and noise due to the reciprocating movements of massive parts. When starting the engine, a characteristic hum is often heard.
Modern manufacturers are trying to minimize the shortcomings by using higher quality bearings and an improved motor suspension system inside the casing. However, in terms of comfort they are inferior to more modern analogues. Crank mechanism requires high-quality lubrication, which in sealed systems does not change for years.
📊 What type of compressor does your current refrigerator have?Ordinary (you can hear the buzzing)Inverter (quiet, no clicks)I don’t know / Didn’t pay attentionLinear (flat, behind)Inverter compressors: technology of the future
Unlike classical models, which operate on the principle of “turned on - cooled - turned off”, inverter compressors operate constantly, but with variable shaft rotation speed. This allows you to maintain the temperature in the chambers with an accuracy of a degree, avoiding sudden jumps characteristic of start-stop systems.
The main advantage of this technology is energy efficiency and low noise level. Since the motor does not have to constantly overcome resting inertia every time it starts, wear on parts is significantly reduced. Many manufacturers provide guarantees for such units for up to 10 years or more, which indicates their high service life.
However, inverter systems also have their own characteristics. They are extremely sensitive to voltage changes in the electrical network. For stable operation of such equipment it is strongly recommended to use a voltage stabilizer, especially in houses with old wiring or in rural areas.
Linear and rotary systems
Linear compressors, which are often confused with inverter compressors, deserve special attention, although the principle of their operation is different. They do not have a crank mechanism, and the piston is driven by electromagnetic forces. This makes the design very compact and almost silent.
Rotary compressors, in turn, use a rotating rotor to compress gas. They are often used in dual-circuit systems, where one motor serves two chambers independently. Such systems allow you to set different temperature conditions in the refrigerator and freezer compartments with high accuracy.
A comparison of various types shows that linear systems benefit in the number of moving parts (there are a minimum number of them), which theoretically reduces the likelihood of breakdown. However, their repair is often impossible - a complete replacement of the unit is required, which can be expensive.
Comparative characteristics of compressor types
To finally make a choice or understand what is installed in your refrigerator, it is convenient to use a comparison table. It will help you quickly assess the pros and cons of each technology.
Characteristics Piston Inverter Linear Noise level High Low Minimum Energy consumption Medium/High Low (class A+) Very low Working life 8-10 years 10-15 years 10-15 years Sensitivity to the network Average High High Repair cost Low High Very high Diagnostics of faults and noise
Understanding how your compressor works helps you notice the signs in time malfunctions. Normal operation is accompanied by a quiet hum and periodic clicks (for conventional models). If you hear a metallic knock, whistle or vibration of the housing, this is a signal of a problem.
A frequent cause of breakdown is the failure of the starting relay or motor windings. In inverter systems, the electronic control board located next to the motor often burns out. Diagnostics of such components requires special instruments, such as a multimeter and a pressure gauge station.
- 🔊 A loud knock during startup, it may indicate wear of the connecting rod bearings or a problem with the engine suspension.
- ❄️ No cold when the engine is running often indicates a loss of compression or a leak frequency The clicking sound and the hum stop - immediately unplug the device. This is a sign of a faulty start relay or jamming of the piston group.
- 🔥 High heat casing (more than 90 degrees) indicates an overload or malfunction of the cooling system of the compressor itself.
⚠️ Attention: If the compressor hums but does not start, and after a few seconds a click is heard and the hum stops, immediately unplug the device. This is a sign of a faulty start relay or a jammed piston group.Tips for extending service life
No matter what type of motor is installed in your refrigerator, following the operating rules will help avoid premature failure. First of all, it is necessary to ensure adequate ventilation of the rear wall, where the condenser and the motor itself are located.
It is not recommended to load too much warm food into the chambers at one time. A sharp increase in internal temperature forces the compressor to work at its limit for a long time, which reduces its life. Let the equipment “rest” after defrosting or long power outages.
☑️ Checking the operating conditions
Completed: 0 / 4Regular cleaning of the rear grille from dust also plays an important role. The dust layer acts as a heat insulator, preventing heat removal, which leads to overheating and increased load on the engine. It is enough to carry out such cleaning once every six months.
Is it possible to replace a conventional compressor with an inverter one?
Theoretically this is possible, but it requires a complete replacement of the control system, wiring and electronics settings. Such a replacement is not economically feasible; it is easier to buy a new refrigerator.
Frequently asked questions (FAQ)
How can I find out which compressor is in my refrigerator?
Look at the sticker with technical information, which is usually located inside the chamber or on the back wall. It indicates the type of refrigerant and sometimes the compressor model. Also, inverter models often have the corresponding “Inverter” marking on the front panel.
Why can an inverter refrigerator hum constantly?
This is normal for inverter systems. They do not turn off completely, but only reduce the speed to a minimum to maintain the temperature. The main thing is that the sound is uniform and quiet, without extraneous knocks.
Is it possible to repair a hermetic compressor?
In the factory, the casing is sealed, and such units are officially considered beyond repair. Specialized services sometimes open the housing to replace the valves, but this is a temporary measure. It is safer to completely replace the unit.
Does the type of compressor affect the freezing speed?
Yes, it does. Inverter and linear models are able to gain power faster during the initial start-up or after loading products, since they can immediately reach high speeds, unlike conventional ones that operate cyclically.