Thermostat Housing Assembly for QTH578K

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Thermostat is a thermostat device, usually containing a temperature sensing component, by expansion or contraction to open, turn off the cooling fluid flow, based on the temperature of the cooling liquid level automatic adjustment into the radiator water, change coolant circulation scope, to adjust the cooling capacity of the cooling system.

The thermostat is mainly the wax type thermostat, by its internal paraffin by thermal expansion and contraction principle to control the cooling fluid circulation way of. When the cooling temperature is lower than the prescribed value, the thermostat sense temperature in refined paraffin wax is solid, the thermostat valve under the action of the spring off the channel between the engine and radiator, cooling fluid through the pump returns to the engine, within the engine cycle. When the coolant temperature reaches the set value, paraffin began to melt gradually become liquid, the volume increases and pressure rubber tube, so that the contraction, the contraction of the push rod to the upward thrust, push rod, the valve down reverse thrust open the valve in the rubber pipe. When the coolant through the radiator and the thermostat valve after the pump back to the engine, proceed big circulation. Most of the thermostat is arranged in the cylinder head out of the water pipe, such advantages are simple structure, easy to discharge the bubbles in the cooling system, the disadvantage is that the thermostat at work often open and close, resulting in oscillation phenomenon.

Thermostat is in the temperature of the car has not reached the normal temperature before in the closed state, then the engine coolant pump returns to the engine, within the engine cycle to allow the engine to heat quickly. When more than normal temperature can be opened, so that the coolant through the radiator loop of the whole tank to carry out a large cycle, so as to quickly heat.

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