What is a car expansion pot
Automobile expansion pot , also known as the expansion tank or auxiliary tank, is an important part of the automobile cooling system. Its main function is to provide an expansion space for the coolant, absorb the excess gas and pressure generated during the operation of the cooling system, and ensure the stable operation of the cooling system.
The basic function of the expansion pot
absorption pressure : When the coolant is circulating in the engine, the coolant will expand due to the principle of thermal expansion and cold contraction. The expansion pot absorbs the expanded coolant and prevents the system pressure from being too high, thus protecting the cooling system from damage .
Separated gas : The coolant generates gases during circulation that, if left in the system, will cause a decrease in heat dissipation efficiency. The expansion pot can separate these gases, ensuring pure coolant and efficient heat dissipation .
Adjust the amount of coolant : the expansion pot can also be used as a coolant supplement container, when the coolant is insufficient, you can supplement the coolant through it to ensure that the engine always has enough coolant for heat .
Structure and type of expansion pot
There are two main types of expansion POTS: atmospheric expansion POTS and high-pressure expansion POTS .
atmospheric expansion pot : This type of expansion pot is not directly connected with the cooling system, and its liquid level cannot fully reflect the total amount of coolant in the cooling system. If the coolant is insufficient, check the entire cooling system before replenishing the coolant in the expansion pot .
high-pressure expansion pot : this type of expansion pot is directly connected with the cooling system, and the liquid level can directly reflect the total amount of coolant in the cooling system, so it is easier to judge whether it is necessary to supplement the coolant .
Expansion pot maintenance and use recommendations
Periodic check : Periodically check the liquid level mark line of the expansion pot to ensure that the liquid level is kept between the highest and lowest level. If the liquid level is too low, the coolant should be added in time .
Avoid opening at high temperature : do not open the expansion lid when the engine is hot, as the internal pressure is higher, which may cause danger .
Check the pressure relief valve : The pressure relief valve is an important part of the expansion pot. If it fails, the pressure cannot be released and may damage the expansion pot or the entire cooling system .
Automotive expansion pot has multiple functions in automotive cooling system, mainly including absorbing pressure, separating gas and preventing coolant from evaporating.
First, the expansion pot can absorb the pressure in the system. When the engine is working, the cooling system will produce a certain pressure, if the cooling system pipeline directly leads to the atmosphere, it will lead to coolant evaporation and chemical property changes, affecting the cooling effect. By closing the operating system, the expansion pot absorbs and contains the pressure generated by the system to ensure stable operation of the system.
Secondly, the expansion pot separates the gas to ensure the heat dissipation efficiency. When the engine is working, gas will be generated in the cooling system. If these gases circulate in the pipeline, gas will be blocked in the heat dissipation pipe, affecting the heat dissipation effect. The expansion pot can separate and contain these gases to prevent gas blockage and ensure heat dissipation efficiency.
In addition, the expansion pot prevents the coolant from evaporating. Since the main component of the coolant is water, the water will evaporate at high temperatures, resulting in a decrease in the coolant. The expansion pot is designed with a closed system to prevent the coolant from evaporating and maintain the stable operation of the system.
Finally, the design features of the expansion pot include water pipe interfaces at its top and bottom. The pipe located in the upper part of the tank is the return port, from which the coolant flows back into the pot; Located at the bottom of the tank is the water outlet, which leads directly to the engine pump, replenishing the pump with antifreeze. There is also a clear sign on the kettle indicating the upper and lower limits of the coolant.
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