The refrigerator is one of the most important electrical appliances in the house, ensuring the safety of food and stable temperature conditions in the chamber. The heart of this complex system is the compressor, which is often called the engine of the unit, since it is responsible for circulating the refrigerant in a closed circuit. Understanding what types of compressors there are in refrigerators is necessary not only when purchasing new equipment, but also for competent diagnosis of malfunctions during operation.
The modern market of household appliances offers many models that differ in operating principle, number of motors and type of drive. The choice of a specific mechanism determines the noise level, energy consumption and durability of the entire device. In this article, we will analyze in detail the design features of various types of motors so that you can navigate the characteristics and not overpay for unnecessary functions.
The principle of operation of a compressor in a refrigerator
The main task of the compressor is to compress and pump gaseous refrigerant. During operation, it sucks freon vapor from the evaporator, compresses it and pumps it under high pressure into the condenser. It is thanks to this cycle that heat is removed from the inner chamber to the outside, which allows maintaining a low temperature.
In the standard circuit refrigerant circulation occurs continuously or cyclically, depending on the type of control. Piston groups or plates create the necessary pressure, forcing the gas to change its state of aggregation. Without this mechanism, heat exchange would be impossible, and the refrigerator would turn into an ordinary heating cabinet.
It is extremely important to understand that the efficiency of the entire system directly depends on the tightness and serviceability of the compressor unit. Any leak or mechanical failure of the piston group leads to a complete stop of cooling. Modern models are equipped with additional sensors and electronics that monitor engine operating parameters in real time.
⚠️ Attention: Opening the sealed compressor housing on your own is strictly prohibited due to the high pressure inside the system and the presence of toxic substances in the oil and refrigerant.
Many users do not think about how exactly their refrigerator runs until it breaks down. However, knowledge of the basic principles helps to quickly notice deviations in operation, such as an unusual hum or too frequent switching on.
Classification by type of drive and design
All compressors can be divided into several main categories depending on how exactly the gas is compressed. The most common are piston models, which have been proven over decades of operation. In them, the piston movement is carried out due to a crank mechanism driven by an electric motor.
The second popular type is rotary compressors, where compression occurs due to rotation of the rotor. They feature fewer moving parts, which theoretically reduces the risk of mechanical failure. There are also screw units, but in household refrigerators they are used extremely rarely due to their high cost and size.
When choosing equipment, you should pay attention to the number of compressors. Dual compressor systems allow you to independently regulate the temperature in the refrigerator and freezer compartments. This increases energy efficiency, since when one chamber is opened, the second motor continues to operate normally, without wasting resources on re-cooling.
Single-compressor models are cheaper, but in them the refrigerant circulates through a single circuit. This means that if the motor malfunctions, the cold disappears in all compartments at once. However, modern control systems have learned to effectively distribute air flows even with one motor.
Conventional (linear) compressors: pros and cons
Traditional linear compressors work on the principle of “turned on - cooled - turned off”. Electronics monitor the temperature in the chamber, and when it rises above a predetermined threshold, a signal is sent to start the motor. After reaching the desired value, the thermostat opens the circuit and the engine stops.
The main advantage of such a system is its simplicity of design and low maintenance cost. Maintainability Linear models are high: craftsmen are well familiar with their design, and spare parts are available on the market. In addition, the initial starting current in such systems, although large, is short-lived.
However, linear compressors also have significant disadvantages. First of all, this is a high noise level at the time of starting and stopping. Also, cyclic operation leads to temperature changes in the chamber, which can negatively affect some products that are sensitive to changes in storage conditions.
- 🔧 Simple and understandable design, diagnostics.
- 💰 Low cost of replacing or repairing the unit.
- 📉 Sensitivity to voltage changes in network.
- 🔊 Higher noise level when starting the engine.
It is worth noting that the service life of a linear compressor largely depends on the frequency of switching on. The more often the refrigerator is opened or warm food is placed in the chamber, the more start-stop cycles the motor performs, which accelerates the wear of mechanical parts.
Inverter compressors: modern efficiency
Inverter technologies came to household appliances relatively recently and have become the standard for premium models. Unlike linear analogues, such compressors do not turn off completely after reaching the desired temperature. Instead, electronic inverter smoothly reduces the engine rotation speed, maintaining the temperature at minimum speed.
This approach eliminates sudden changes in temperature inside the chamber. Products are stored in more stable conditions, which extends their freshness. In addition, the absence of constant on and off cycles significantly reduces the level of noise and vibration.
How does an inverter work?
The inverter converts alternating current from the network into direct current, and then again into alternating current, but with a variable frequency. This allows you to precisely control the speed of rotation of the motor shaft, ensuring smooth operation without jerking.
Energy consumption of inverter models can be 20-30% lower compared to conventional refrigerators. The engine operates in a gentle mode, which has a positive effect on the durability of the components. Many manufacturers provide an extended warranty for such compressors, sometimes up to 10 years.
⚠️ Attention: Inverter compressors are very sensitive to the quality of the electrical network. Voltage surges can damage the control unit, so it is recommended to use stabilizers.
Despite the obvious advantages, inverter systems also have disadvantages. First of all, this is the high cost of the refrigerators themselves. In addition, repairing the inverter electronics requires special equipment and qualifications, which makes maintenance expensive.
Comparative table of characteristics
In order to finally make a choice, it is convenient to compare the main parameters of different types of compressors in the summary table. This will help you visualize the differences and understand which option is right for your operating conditions.
| Characteristics | Linear (Normal) | Inverter | Linear-inverter |
|---|---|---|---|
| Operating principle | On/Off | Smooth speed change | Smooth piston movement |
| Noise level | Medium/High at Start | Low | Minimum |
| Energy consumption | Standard | Economy | Maximum economical |
| Repair cost | Low | High | High |
| Work resource | Standard | Increased | Increased |
As can be seen from the table, linear inverter compressors (often used by the LG brand) combine the absence of a crank mechanism and smooth control. This makes them one of the quietest and most reliable on the market, although expensive to replace.
Diagnostics of faults and noise
Understanding how your refrigerator works helps you spot a problem early. For example, if a regular compressor starts humming continuously without turning off, this may indicate a freon leak or a loss of system tightness. In this case, the motor tries to compensate for the lack of cold, working to wear out.
Inverter models can signal problems with error codes on the display or a change in the nature of the sound. The appearance of knocking, clanging or metallic grinding is an alarming sign that requires immediate contact with a specialist. Ignoring these symptoms can lead to complete failure of the unit.
☑️ Checking the operation of the compressor
Often users confuse normal operating noise with signs of breakdown. The gurgling of liquid in the pipes is a normal process of refrigerant circulation. However, if strong floor vibration or rattling is added to this, it is worth checking the installation of the refrigerator and the condition of the shock absorbers.
What to choose: final recommendations
The choice between a conventional and inverter compressor depends on your budget and priorities. If maximum silence and temperature stability are important to you, and you are also willing to overpay when purchasing in order to save on electricity in the future, you should definitely look towards inverter models.
If the budget is limited, or the refrigerator is planned to be used in a country house where power outages are possible, then a classic linear compressor will be a more rational choice. It more easily forgives power surges and is cheaper to repair.
In any case, modern technology is becoming more and more reliable, regardless of the type of motor. The main thing is to follow the operating rules, regularly defrost the unit (if required) and not overload the power grid.
Frequently asked questions (FAQ)
Does an inverter refrigerator make a lot of noise?
No, inverter models are much quieter than conventional ones. They are devoid of the sounds of sudden start and stop, and the constant low-frequency hum is barely audible and does not irritate the ear.
Is it possible to replace a linear compressor with an inverter one?
Theoretically it is possible, but technically difficult and economically impractical. It will be necessary to replace the control board, re-solder the pipes and set up the system, which will cost more than the price of a new refrigerator.
How many years does a compressor last in a refrigerator?
The average service life of a high-quality compressor is 10-15 years. Inverter models, under favorable conditions, can operate for up to 20 years or more.
Why does the refrigerator turn on immediately after being turned off?
This may indicate a thermostat malfunction, a refrigerant leak, or compressor wear. In normal mode, there should be a break between operating cycles to equalize the pressure.