The wax type thermostat is commonly used in most automobiles as it’s the most reliable one with highest efficiency. This type of thermostat is used in JCB machines. Engineering
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What is the purpose of cooling the engine?
The engine is made of metals or alloys, so as the engine temperature rises while working metals or alloys tend to expand beyond a particular limit of temperature (this result in the change in dimension of the engine resulting in failure). To avoid this cooling is required.--Technical Videos--
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| Fig: 1 |
Why a thermostat is used?
There is an optimum temperature at which engine can produce maximum efficiency (ranges between 75-85 degree Celsius). So only after engine reaching this particulate temperature cooling need to occur, to ensure this the thermostat is used. Thermostat allows the coolant to pass through the engine galleries only after the engine has attained the temperature range of (75-85 degree Celsius) which varies for engine to engine.
The major component of wax type thermostat are:
- Plunger.
- Rubber plug.
- Copper loaded wax.
Working of wax loaded thermostat:
As shown in fig: 1 the valve of the thermostat is connected to the plunger and the plunger rests in the rubber plug. The rubbers plug seats on the container with the copper loaded wax.
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| Fig: 2 |
As the temperature rises between 75-85 degree celsius, due to high coefficient of thermal expansion (property of copper loaded wax) of the copper loaded wax, it expands and contracts against the plunger. This results the plunger to move up, which will intern open the valve in contact with the plunger. As the thermostat valve opens the engine cooling galleries get connected to the radiator and the coolant (water) starts to circulate and the cooling occurs.--Technical Videos--
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