What is the working process of the thermostat? What does a thermostat do?

The thermostat, also known as the thermostat, is to automatically adjust the amount of water entering the radiator according to the temperature of the cooling water, change the circulation range of the water, adjust the heat dissipation capacity of the cooling system, and ensure that the engine works within the appropriate 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 prolonged, and the engine temperature will be too low.

At this time, it can be judged whether the working condition of the thermostat is good, when the engine starts to run cold, if there is still cooling water flowing out at the water inlet pipe of the water chamber of the water tank, it means that the main valve of the thermostat can not be closed; When the engine cooling water temperature exceeds 70 degrees Celsius, and there is no cooling water flowing out of the inlet pipe of the water tank upper water chamber, it means that the main valve of the thermostat cannot be opened normally, and it needs to be repaired. The thermostat inspection can be carried out on the car in the following ways:

Check after the engine starts: open the radiator water nozzle cover, if the cooling level in the radiator is quiet, it means that the thermostat is working normally, otherwise, it means that the thermostat is working abnormally. This is because, when the water temperature is lower than 70, the thermostat expansion cylinder is in a contracted state and the main valve is closed; When the water temperature is higher than 80, the expansion cylinder expands, the main valve gradually opens, and the circulating water in the radiator begins to flow.

When the water temperature gauge indicates below 70, if there is water flowing at the radiator inlet pipe and the water temperature is warm, the main valve of the thermostat is not closed tightly, so that the cooling water is prematurely circulated.

Check after the water temperature rises: at the beginning of engine operation, the water temperature is thousands and fast; When the water temperature gauge indicates 80, the heating rate slows down, indicating that the thermostat is working normally. On the contrary, if the water temperature has been rising rapidly, when the internal pressure reaches a certain level, the boiling water suddenly overflows, indicating that the main valve is stuck and suddenly opened.

When the water temperature meter indicates 70 -80, open the radiator cover and the radiator water discharge switch, feel the water temperature with your hand, if it is hot, the thermostat is working normally; If the water temperature at the radiator inlet is low, and there is no water outflow or little water at the inlet pipe of the radiator upper water chamber, it means that the main valve of the thermostat cannot be opened.

Thermostats that are stuck or not tightly closed should be removed for cleaning or repair, and should not be used immediately.

When the engine is just started, because the water temperature has not reached the working temperature of the thermostat, it is in a closed state, and it is a small cycle at this time, and when the temperature is reached, the silicone oil in the thermostat is heated and expands, and the thermostat is opened.

The working principle of the thermostat and the internal structure.

Control engine coolant and intake air temperatures. The function of the thermostat is to adjust the engine to be cooled through the heat dissipation tank. When the outlet water temperature reaches 83 ±3 in the process of vehicle starting, the thermostat valve is completely neutral, it can make the engine temperature rise rapidly, open, bypass closed, and all the water outlet is reduced by the temperature saving to reduce the wear of the cylinder.

The working principle of the valve is discharged or flowed through the heat dissipation water tank: when the cooling water is at a low temperature, the thermostat is cooled.

Thermostat precautions.

It should be noted that the vent hole on the thermostat cannot be glued under normal circumstances. Based on many years of experience, the reliability of the effect of applying glue in our cold winter in the north has been improved to a certain extent. The premise is that the cylinder gasket can not be blocked, the gas will cause air blockage, and the thermostat is not easy to open after high temperature (whether to block this exhaust hole is selected according to your own situation, 99 cars are no problem).

The thermostat is generally installed at the intersection of the engine outlet pipe, and is generally paraffin. When the water temperature is low, the paraffin wax is solid, the thermostat is not opened, and the engine cooling water goes through a small circulation (engine-warm air), so that the engine water temperature rises rapidly and the engine warms up quickly. When the water temperature reaches about 85 degrees, the paraffin wax begins to melt gradually, open the thermostat to make it open slowly, and then start a large circulation (engine - heater - radiator), the water will go to the radiator, so that the water temperature control range is not too high.

What exactly is the function of a thermostat?

Thermostats work by expanding or shrinking to turn the coolant on and off. That is, the amount of water entering the radiator is automatically adjusted according to the temperature of the cooling liquid, and the circulation range of the coolant is changed to adjust the heat dissipation of the cooling system.

The thermostat used before the demolition of the old man was mainly a wax thermostat, which was controlled by the paraffin wax inside the wheel through the principle of thermal expansion and cold contraction. When the cooling temperature is lower than the specified value, the refined paraffin in the thermostat body of the thermostat is solid, the thermostat valve closes the channel between the engine and the radiator under the action of the spring, and the coolant returns to the engine through the water pump for small circulation in the engine.

Most of the thermostats are arranged in the cylinder head outlet pipeline, which has the advantage of simple structure and easy to discharge air bubbles in the cooling system; The disadvantage is that the thermostat often opens and closes when working, resulting in oscillation; When the engine operating temperature is low (below 70°C), the thermostat automatically closes the path to the radiator and opens the path to the water pump, and the cooling water from the jacket enters the pump directly through the hose.

It is a valve that controls the flow path of the coolant. It is an automatic temperature control device, usually containing a temperature sensing component, which turns on and off the flow of air, gas, or liquid by means of thermal expansion or cold contraction.

The thermostat automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water, and changes the circulating range of the water to adjust the heat dissipation capacity of the cooling system and ensure that the engine works within the appropriate temperature range.

How the thermostat works:

1) The main thermostat used is the wax thermostat, when the cooling temperature is lower than the specified value, the delicate paraffin wax in the thermostat thermostat temperature sensing body is solid, the thermostat valve closes the channel between the engine and the radiator under the action of the spring, and the coolant returns to the engine through the water pump to carry out a small circulation in the engine.

2) When the coolant temperature reaches the specified value, the paraffin wax begins to melt and gradually becomes liquid, and the volume increases and compresses the rubber tube to shrink.

3) At the same time as the rubber tube shrinks, the push rod acts on the upward thrust, and the push rod has a downward reverse thrust on the valve to open the valve. At this time, the coolant flows back to the engine through the radiator and thermostat valves, and then through the water pump, where it is circulated.

Location of the thermostat:

The thermostat is located in the outlet pipe of the cylinder head to ensure the normal operation of the engine by automatically adjusting the circulation of the cooling water. Secondly, there is also a hot core in the lower middle of the thermostat, when the internal circulation temperature rises to a critical value, the hot core will begin to expand, so as to separate the inner ring and the outer ring of the thermostat disc, so as to achieve the effect of cooling the engine inside Lu Laoye.

The function of the thermostat is: to save energy, prolong the life of the equipment, improve the efficiency of the system, protect the safety, and facilitate the use.

1. Save energy.

Thermostats can save energy by controlling the temperature. For example, the use of thermostats in the home can regulate the temperature of heating and air conditioning to avoid wasting energy and increasing energy costs. In industrial applications, thermostats can control the temperature status of equipment to avoid overheating and wasting energy.

2. Extend the life of the equipment.

Thermostats can protect the equipment from excessive heating and cooling, thus extending the life of the equipment. For example, the use of thermostats in automotive engines can regulate engine temperatures to avoid overheating and reduce wear, thereby extending engine life.

3. Improve system efficiency.

A thermostat can improve the efficiency of the system because it ensures that the temperature of the system is kept within the proper range. For example, the use of thermostats in chemical reactions can ensure accurate control of the reaction temperature, resulting in increased reaction efficiency and yield.

4. Protect safety.

Thermostats protect systems and equipment. For example, the use of a thermostat in a boiler allows the water temperature to be controlled to avoid overheating and**. The use of thermostats in the home can avoid fires and other safety issues.

5. Easy to use.

The thermostat can be convenient to use as it can control the temperature automatically. For example, the use of a thermostat in the oven can automatically control the oven temperature, making it convenient for the user. The use of a thermostat in the faucet allows the water temperature to be automatically controlled, making it convenient for the user.