The main working part of the general car is the engine, and the engine will produce a lot of heat. Sometimes excessive heat will make the car parts too hot, resulting in parts failure. Therefore, a special radiator needs to be equipped in the engine compartment of the car to reduce the temperature in the working compartment. Although the general car radiator can play a role in cooling to a certain extent, the energy consumption is high, the cooling core is easy to damage, and due to the design limitations, its working coverage is also limited.
The working principle of automobile radiator &ndash &ndash radiator structure
Automobile radiator is an indispensable component in automobile water-cooled engine cooling system. Now, it is moving towards being lightweight, efficient and economical. The structure of car radiators may not necessarily adapt to new developments. The most common structural forms of automotive radiators include DC type and cross-flow type.
In general, the structural form of the radiator core can be divided into two categories: tubular and tubular. The core of a tubular radiator consists of a number of thin cooling tubes and fins. Most cooling tubes use oblate cross sections to reduce air resistance and increase heat transfer area. The radiator core should have enough circulation area for the antifreeze to pass through, and there should also be enough circulation area for the air body to take away the heat transferred to the radiator by the antifreeze through the air body.
Radiator plays an irreplaceable important role in auto parts, and maintenance is essential. At the same time, there must be sufficient heat dissipation area to complete the heat exchange between the antifreeze, the air body and the radiator. The tubular radiator is welded by alternating arrangement of corrugated cooling strips and cooling pipes. Compared with the tubular radiator, under the same conditions, the heat dissipation area of the tubular radiator can be increased by about 12%. In addition, the dispersion zone is also provided with holes similar to shutters, which disturbs the air flow, destroys the adhesion layer of the circulating air body on the surface of the dispersion zone, and improves the heat dissipation capacity
The core of the radiator should have a sufficient flow area for the coolant to pass through, and it should also have a sufficient air flow area for a sufficient amount of air to pass through to take away the heat transferred by the coolant to the radiator. [1]
At the same time, it must also have sufficient heat dissipation area to complete the heat exchange between the coolant, air and heat sink.
The tubular belt radiator is composed of corrugated heat distribution and cooling pipe interarranged by welding.
Compared with the tubular radiator, the tubular radiator can increase the heat dissipation area by about 12% under the same conditions, and the heat dissipation belt is opened with a similar window shutter hole with disturbed air flow to destroy the adhesion layer of the flowing air on the surface of the dispersion zone and improve the heat dissipation capacity.
Therefore, no matter what liquid is used to cool the engine, it must have a very low freezing point, a very high boiling point, and can absorb a lot of heat. Water is one of the most efficient liquids for absorbing heat, but its freezing point is too high for use in a car engine. The liquid used in most cars is a mixture of water and ethylene glycol (c2h6o2), also known as antifreeze. By adding ethylene glycol to water, the boiling point can be significantly increased and the freezing point reduced.
Whenever the engine is running, the water pump circulates the liquid. Similar to centrifugal pumps used in cars, the pump operates by centrifugal force to transport the liquid outside and continuously sucks the liquid from the middle. The inlet of the pump is located close to the center, so the liquid returning from the radiator can reach the pump blades. The pump blade sends the liquid to the outside of the pump, where it enters the engine. The fluid from the pump flows first through the engine block and cylinder head, then into the radiator, and finally back to the pump. The engine block and cylinder head have a number of channels that are cast or machined to facilitate liquid flow.
If the flow of liquid in these pipes is smooth, only the liquid in contact with the pipe will be cooled directly. The amount of heat transferred from the liquid flowing through the pipe to the pipe depends on the temperature difference between the pipe and the liquid touching the pipe. Therefore, if the liquid in contact with the pipe is cooled quickly, less heat will be transferred. By creating turbulence in the pipe, mixing all the liquids, keeping the liquids in contact with the pipe high to absorb more heat, so that all the liquids in the pipe can be used efficiently.
The transmission cooler is very similar to the radiator inside the radiator, except that instead of exchanging heat with the air, the oil exchanges heat with the coolant inside the radiator. Pressure tank cover The pressure tank cover can increase the boiling point of the coolant by 25 ° C.
The main function of the thermostat is to heat up the engine quickly and maintain a constant temperature. It is achieved by regulating the amount of water flowing through the radiator. At low temperatures, the outlet of the radiator will be completely blocked, that is, all the coolant will be recirculated through the engine. Once the temperature of the coolant rises to between 82 and 91 ° C, the thermostat opens, allowing the liquid to flow through the radiator. When the temperature of the coolant reaches 93-103 ° C, the thermostat will remain open.
The cooling fan is similar to a thermostat and must be controlled to keep the engine at a constant temperature. Front wheel drive cars are equipped with fans because the engine is usually mounted transversally, that is, the output of the engine faces one side of the car.
Fans can be controlled by thermostatic switches or engine computers, and these fans will turn on when the temperature rises above the set point. When the temperature drops below the set point, these fans will shut down. Rear-wheel drive cars with longitudinal engines are usually equipped with engine-driven cooling fans. These fans have thermostatically controlled viscous clutches. The clutch is located in the center of the fan and is surrounded by the air flow out of the radiator. This particular type of viscous clutch is sometimes more like a viscous coupler for an all-wheel drive car. When the car overheats, open all Windows and run the heater while the fan is running at full speed. This is because the heating system is actually a secondary cooling system, which can reflect the situation of the main cooling system on the car.
The heater duct system located in the dashboard of the car's heating bellows is actually a small radiator. The heater fan allows air to flow through the heating bellows before entering the passenger compartment of the car. The heater bellows are similar to a small radiator. The heater bellows draw hot coolant from the cylinder head and then return it to the pump, so the heater can operate with the thermostat on or off.
The belt type automobile radiator consists of a cooling tube, a dispersing belt, a main plate, a bracket, a left water chamber, a right water chamber, a cooling pipe on the main plate, a cooling pipe on the cooling belt, a left water chamber on the left side of the main plate, a right water chamber on the right side of the main plate, a water inlet pipe in the right water chamber, a water outlet pipe in the left water chamber, and a support for the left water chamber and the right water chamber respectively.
The core of the tubular radiator is composed of many thin cooling tubes and heat sinks, and the cooling tubes mostly adopt flat and circular sections to reduce the air resistance and increase the heat transfer area
The core of the radiator should have a sufficient flow area for the coolant to pass through, and it should also have a sufficient air flow area for a sufficient amount of air to pass through to take away the heat transferred by the coolant to the radiator. At the same time, it must have enough heat dissipation area to complete the heat exchange between the coolant, air and heat sink.
The tubular belt radiator is composed of corrugated heat distribution and cooling pipe interarranged by welding.
Compared with the tubular radiator, the tubular radiator can increase the heat dissipation area by about 12 percent under the same conditions, and the heat dissipation belt is opened with a similar window shutter hole with disturbed air flow to destroy the adhesion layer of the flowing air on the surface of the dispersion zone and improve the heat dissipation capacity.
The function of the car cooling system is to keep the car in the appropriate temperature range under all working conditions. The cooling system of a car is divided into air cooling and water cooling. The air as the cooling medium is called the air cooling system, and the coolant as the cooling medium is called the water cooling system. Usually, the water cooling system consists of a pump, radiator, cooling fan, thermostat, compensation bucket, water jacket in the engine body and cylinder head, and other auxiliary devices. Among them, the radiator is responsible for the cooling of circulating water, its water pipe and heat sink are made of aluminum, aluminum water pipe is made into a flat shape, the heat sink is corrugated, pay attention to the heat dissipation performance, the installation direction is perpendicular to the direction of air flow, as far as possible to achieve small wind resistance and high cooling efficiency. The coolant flows inside the radiator core, and the air passes outside the radiator core. The hot coolant cools because it dissipates heat to the air, and the cold air heats up because it absorbs the heat emitted by the coolant, so the radiator is a heat exchanger.
Radiators are car cooling systems. The radiator in the engine water cooling system is composed of inlet chamber, outlet chamber, main board and radiator core. The antifreeze liquid flows into the radiator core, and the air body flows out from the radiator core. The hot antifreeze becomes cold because it dissipates heat to the air body, and the cold air body becomes warm because it absorbs heat from the antifreeze, so the radiator is a heat exchanger.
The working principle of car radiator &ndash &ndash radiator principle
To prevent the engine from overheating, parts around the combustion chamber (cylinder liner, cylinder head, valve, etc.) Must be properly cooled. In order to ensure the cooling effect, the automotive cooling system is mostly composed of radiator, thermostat, water pump, cylinder water channel, cylinder head water channel, fan and so on. The radiator cools the circulating water. Its pipes and heat sinks are mostly aluminum. The aluminum water pipe is flat and the fins are corrugated. It focuses on heat dissipation. The installation direction is perpendicular to the air flow direction, the wind resistance should be small, and the cooling efficiency should be as high as possible.
The antifreeze liquid flows into the radiator core, and the air body flows out from the radiator core. The hot antifreeze becomes cold because it dissipates heat to the air body, and the cold air body becomes warm because it absorbs heat from the antifreeze, so the radiator is a heat exchanger.