What is radiator thermostat ?
What is radiator thermostat ?
The radiator thermostat is the valve that controls the coolant flow path. It is an automatic temperature control device that usually contains a temperature-sensing component that opens and closes the flow of air, gas or liquid through thermal expansion or contraction.
The radiator thermostat automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water, and changes the water circulation range to adjust the heat dissipation capacity of the cooling system and ensure that the engine operates within a suitable temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine. If the main valve of the thermostat is opened too late, it will cause the engine to overheat; if the main valve is opened too early, the engine warm-up time will be extended and the engine temperature will be too low.
All in all, the role of the radiator thermostat is to keep the engine from getting too cold. For example, after the engine is running normally, the engine temperature may be too low if there is no thermostat when driving in winter. At this time, the engine needs to temporarily stop water circulation to ensure that the engine temperature does not become too low.
The main radiator thermostat used is a wax thermostat. When the radiator temperature is lower than the specified value, the refined paraffin in the thermostat's temperature sensing body becomes solid, and the thermostat valve closes between the engine and the radiator under the action of the spring. channel, the coolant returns to the engine through the water pump, and performs small circulation within the engine. When the coolant temperature reaches the specified value, the paraffin begins to melt and gradually turns into a liquid. The volume increases and presses the rubber tube to cause it to shrink. When the rubber tube shrinks, it exerts an upward thrust on the push rod, and the push rod exerts a downward reverse thrust on the valve to open the valve. At this time, the coolant passes through the radiator and thermostat valve, and then flows back to the engine through the water pump for a large circulation. Most thermostats are arranged in the water outlet pipe of the cylinder head. The advantage of this is that the structure is simple and it is easy to eliminate air bubbles in the cooling system; the disadvantage is that the thermostat often opens and closes during operation, causing oscillation.
