Thermostat

Applicable models

The thermostat is a valve that controls the flow path of the coolant. It is an automatic temperature regulating device, usually containing temperature sensing components, which open and close the flow of air, gas or liquid by thermal expansion or contraction.Tarzan auto parts---Our inventory includes all auto parts sold in the world, including Dongfeng, Sinotruk, Howo, FAW Honda, Toyota, Volkswagen, Volvo, etc. Welcome to buy.

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Introduction

The 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 to ensure that the engine works in 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 prolonged and the engine temperature will be too low.
All in all, the function of the thermostat is to keep the engine from overcooling. For example, after the engine is working normally, the temperature of the engine may be too low if there is no thermostat when it is driven in winter. At this time, the engine needs to temporarily stop water non-circulation to ensure that the engine temperature is not too low.

principle

The main thermostat used is a wax type thermostat. When the cooling temperature is lower than the specified value, the fine paraffin in the thermostat body is solid, and the thermostat valve closes the engine and the radiator under the action of a spring. The cooling fluid is returned to the engine through the water pump to carry out a small circulation in the engine. 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 it. When the rubber tube is contracted, an upward thrust is applied to the push rod, and the push rod has a downward reverse thrust on the valve to open the valve. At this time, the coolant flows through the radiator and the thermostat valve, and then flows back to the engine through the water pump for a large cycle.
Most of the thermostats are arranged in the water outlet pipeline 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 is often opened and closed during operation, causing oscillation.

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Engine application scenarios