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The engine is powered by the combustion of fuel in the cylinder to generate power
The engine is powered by the combustion of fuel in the cylinder to generate power, the input fuel volume is limited by the amount of air drawn into the cylinder, the power generated will be limited, if the engine's operating performance has been in the best condition, then increase The output power can only increase the amount of fuel by compressing more air into the cylinder, improving the combustion function. turbocharger shaft Under current technology conditions, the turbocharger is the only mechanical device that can increase the output power of the engine without changing the operating efficiency.
The turbocharger is a machine consisting of a turbine chamber and a supercharger. The inlet of the turbine chamber is connected with the exhaust manifold, and the exhaust port is connected with the exhaust pipe; the supercharger air inlet and the air filter pipeline Connected, the exhaust port is connected to the intake manifold. The turbine and the impeller are respectively installed in the turbine chamber and the supercharger, and they are coaxially rigidly coupled.
The turbocharger is actually an air compressor that increases the amount of intake air by compressing the air. It uses the inertial impulse of the exhaust gas emitted by the engine to propel the turbine in the turbine chamber. The turbine also drives the coaxial impeller. The impeller pressures the air sent from the air filter duct to pressurize it into the cylinder. When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase at the same time, the impeller will compress more air into the cylinder, the air pressure and density increase can burn more fuel, increase the fuel amount and adjust the engine's Speed, you can increase the engine's output power.
The turbocharger is installed on the intake and exhaust manifolds of the engine. Under the working conditions of high temperature, high pressure and high-speed operation, the turbocharger has a very harsh working environment and a relatively strict working requirement. Therefore, the turbocharger is required for manufacturing materials and processing technology. Very high. Among them, the most difficult to manufacture is the “floating bearing” that supports the operation of the turbine shaft. Its working speed can reach 100,000 rpm or more, and the ambient temperature can reach six or seven or more Baidu, which is by no means a general bearing. There is oil cooling between the bearing and the inner wall of the machine body, also called "full-floating bearing".
The turbocharger consists of a turbine wheel and a compressor wheel mounted on the same supercharger shaft. The supercharger shaft is supported on a bearing in the supercharger housing. The turbine wheel and the compressor wheel have many blades. Exhaust from the cylinder directly enters the turbine and drives the impeller and booster shafts to rotate, because the compressor wheel is fixed at the other end of the booster shaft, so the compressor wheel also rotates with the shaft.
The impeller of the compressor is installed in the intake duct. When the compressor impeller rotates, air is sucked into the intake duct and sent to the intake duct after being compressed by the compressor. Most supercharged engines are air-duct fuel injection engines. Fuel injected into the intake passage is mixed with compressed air to form a denser air-fuel mixture. As the amount of air-fuel mixture entering the cylinder increases, the engine power increases.
Turbocharged impellers rotate at high speeds in excess of 100 000 r/min, so impeller balance and bearing lubrication are very important. The supercharger shaft must reach a certain speed before the supercharger starts to pressurize the air in the intake pipe. Some turbochargers start to compress air at an engine speed of 1 250 r/min, and at 2 250 r/min. The maximum boost pressure is reached.