Surgical instruments HS code classification

* Automobile engine schematic diagram (automobile engine structure diagram) Automobile engine is Surgical instruments HS code classificationan important part of the automobile and the core of automobile power. And the engine itself is also composed of multiple parts. Next, let's take a look at the diagram of the car engine. The car engine diagram engine includes: cylinder block, cylinder head, crankcase, camshaft, valve, piston, connecting rod and dozens of other parts.The engine cooperates with these parts to form an organic mechanical structure, so that the vehicle is powered and driven to the destination. In terms of the structural geometry of automobile engines, the engines are divided into three structures, such as in-line, V-type and opposite. An in-line engine means that the cylinders are arranged in a row, and the expansion force generated by the gas in the cylinder can be smoothly transmitted to the crankshaft. In the V-type engine, the cylinder block is arranged in two rows. In the opposite engine, the cylinder blocks are arranged side by side in pairs of long strips. According to the nature of large displacement and high pressure of diesel engines, diesel engines often use a V-shaped structure. At the same time, the interior of the engine includes cam cavity, cylinder, crankshaft, connecting rod, piston and other parts. Take the in-line four-cylinder engine as an example. In each cylinder block, there is a piston, and the cylinder and the piston form a piston system.The top of the cylinder is equipped with a cylinder head, which can be used not only to close the cylinder, but also as a base for the intake and exhaust valves. The cylinder head is equipped with suction intake and exhaust channels to fully mix fuel and air and send the combustion exhaust gas out of the cylinder block. The engine also includes air intake system, fuel system, ignition system, cooling system and other systems. These systems are directly related to the work efficiency and performance of the engine. Air intake system: including air intake filter, air intake duct, air intake manifold, throttle valve and other components. The function of the air intake system is to mix air and fuel and send it into the engine combustion chamber so that the engine can operate efficiently. Fuel system: It is composed of a fuel tank, an oil pump, an oil line, a fuel injector, etc. The oil pump is responsible for extracting fuel from the fuel tank, transporting it into the oil line, and finally reaching the fuel injector. The fuel injector willAccording to the control signal of the ECU, the injection time and fuel volume are controlled, and the fuel is sprayed into the intake channel to form a mixture of air, and then supplying the combustion chamber of the engine. Ignition system: It is composed of ignition switch, ignition coil, spark plug and other components. The ignition coil requires the transformer to convert the 12V voltage into a high-voltage current of about 30,000V. The current ignited by the battery ignition coil ignites the mixed gas through the spark formed by the spark plug, and then drives the engine to run. Cooling system: composed of water tank, water pump, water pipe and radiator. The main functions of this system are heat conduction and heat dissipation. The water tank receives hot water imported from other systems. The pump pumps the water from the water tank to the radiator. The hot water is naturally blown by the fan and the enhanced airflow of the air duct in the radiator, and finally flows back to the water tank for repeated circulation. HeddleAs mentioned above, the engine is assembled from multiple parts, and each part cooperates with each other to form an organic mechanical structure, thus providing power and efficiency for automobiles. The engines introduced above are mainly in-line four-cylinder engines. Of course, different types of vehicles also have different structural types of engines. However, its internal structure and component structure are basically the same. Therefore, it is of great significance for users to understand the basic structure, principle and system characteristics, maintenance, maintenance and fault repair of the engine.

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