What is a car expansion tank
automotive expansion tank is an important component used in automotive cooling system. Its main function is to accommodate the expansion water generated by temperature changes to ensure that the engine can maintain a stable coolant level under various working conditions. The expansion tank is designed to absorb and release water when the pressure changes, thereby maintaining the pressure stability of the system, reducing the frequent operation of the safety valve and the burden of the automatic water refill system .
Structure and material
An expansion tank usually consists of the following parts:
Tank body : Generally durable carbon steel material, the outside is covered with a layer of anti-rust baking paint to protect the internal structure.
air bag : made of environmentally friendly EPDM rubber and pre-filled with nitrogen.
inlet and outlet : used for inlet and outlet of coolant.
air supplement : used to supplement gas .
Working principle
The operation principle of the expansion tank is based on the balance principle of gas and liquid. When the coolant enters the airbag, the nitrogen is compressed and the pressure rises until the water intake stops when it reaches equilibrium with the pressure of the coolant. When the coolant decreases and the pressure drops, the nitrogen in the tank expands to discharge the excess water and maintain the stable pressure of the system .
Application scenarios and importance
The expansion tank plays a vital role in the automotive cooling system, ensuring the stable operation of the cooling system. It can absorb and release the pressure fluctuations of the system, reduce the vibration of pipes, equipment and buildings, and improve the comfort of the vehicle. In addition, expansion tanks can protect other equipment from damage, reduce the energy consumption of the system, and improve energy efficiency .
The main functions of the automobile expansion tank include the following aspects :
Accommodate coolant expansion : When the engine is operating, the coolant will expand due to increased temperature. The expansion tank can contain this part of the expanded coolant, prevent the coolant overflow, and ensure the normal operation of the cooling system.
Stabilizing system pressure : The expansion tank absorbs and releases pressure fluctuations in the system, keeps the pressure in the system stable, reduces vibration of pipes, equipment, and buildings, and protects other equipment from damage.
water refill function : The expansion tank can adjust the water quantity in the system through the compression and expansion of the air bag to ensure that the system can automatically replenish or release water when the pressure changes, reducing the number of pressure relief of the safety valve and the number of water refill of the automatic water refill valve.
Energy-saving function : In the heating system, the expansion tank can avoid excessive heating, thereby saving fuel and improving energy efficiency.
The working principle of the expansion tank : the expansion tank is composed of a tank body, an air bag, a water inlet and an air inlet. When water with external pressure enters the expansion tank air bag, the nitrogen sealed in the tank is compressed until the gas pressure in the expansion tank reaches the same pressure as the water pressure. When the water loss causes the pressure to decrease, the gas pressure in the expansion tank is greater than the water pressure. At this time, the gas expansion extrudes the water in the air bag to the system, thus maintaining the stability of the system pressure.
The composition of the expansion tank : the expansion tank is mainly composed of water inlet and outlet, tank body, air bag and air supplement valve. The tank body is generally carbon steel material, the outside is anti-rust baking paint layer, the air bag is EPDM environmental protection rubber, the pre-filled gas between the air bag and the tank has been filled before the factory, there is no need to fill the gas.
Through these functions and principles, the expansion tank plays an important role in the automotive cooling system, ensuring the stable operation of the system and the protection of the equipment.
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