The working principle of thermostat
Maybe the thermostat like your car with the water inlet pipe and water outlet pipe may be different, the picture is different, your car Never mind.
The principle is the same
This is the thermostat
After the engine starts, when the water temperature reaches a certain temperature, the rubber valve opens, and the cooling water changes from small cycle to large cycle
The red represents the direction of the rubber valve opening
The blue arrow is the spring after the valve, the direction of extension. When the water temperature does not reach a large degree of circulation, the valve is the big spring of the strong elasticity of the top. So the valve is closed
Green ripples represent cooling water
This is the state of immersion in boiling water, simulating the cooling water temperature of the engine. You can see the rubber valve opens a gap
This is the import and export control part of the engine size cycle, that is, the thermostat is located
This is just a flat picture on the floor. It's just the same place as the engine outlet. The right pipe is a hot water pipe that provides warm air into the cab
The big circle in the picture is the place where the thermostat is placed
As shown below, the thermostat is placed in this way
The diagram below is the diagram of the cooling water of the engine
From the engine out of the water in the water jacket, the first after the above export, in part through the small pipe into the cab to provide warm air heat. The other part is through the above, the arrival of large circulating water outlet, radiator circulating water outlet water passing through the front of the front, and then through the return pipe to the thermostat.
When the vehicle starts, the cooling water has not reached the temperature of the thermostat. The large circulation water inlet cannot be opened because the thermostat valve is not opened
The green line represents the water temperature that has not reached the thermostat's opening temperature. Red represents the large cycle after the opening
The direction of the green line is: the engine jacket water, through the above holes flow into the air conditioning water pipe, and then cycle, and then back to the small cycle of water intake into the engine water jacket, so as to carry out the small cycle in the engine
Red line direction: the engine jacket water, through the upper hole flow into the big loop, and then through the radiator before the car, arrived at the thermostat valve, because at this time, because of high temperature, the valve opens, the large circulation waterway is unobstructed
The structure of the car represents the structure of most cars. The thermostat is opened inward (the intensity of the valve opening, the dynamics of the spring top). At low temperature, the valve is closed under the strong pressure of the spring of the thermostat, and the valve is closed
So, once the thermostat fails, the valve will be held tightly by the spring force and will always be closed
It will appear, not the cooling water cycle, the water temperature is too high, and boil.