1、沼氣發電機組的曲柄連桿機構是發動機實際工作周期中完成能量轉換的主要運動部件。 由機體組、活塞連桿組、曲軸飛輪組等組成。 在工作過程中，活塞受到氣體的壓力，在氣缸內進行直線運動，通過連桿轉換為曲軸的旋轉運動，從曲軸向外部輸出動力。 另一方面，在吸氣、壓縮和排氣過程中，飛輪釋放能量，將曲軸的旋轉運動轉換為活塞的直線運動。

1. The crank connecting rod mechanism of a biogas generator set is the main moving component that completes energy conversion during the actual working cycle of the engine. Composed of a body assembly, piston connecting rod assembly, crankshaft flywheel assembly, etc. During the working process, the piston is subjected to gas pressure and moves in a straight line within the cylinder. It is converted into the rotational motion of the crankshaft through the connecting rod, outputting power from the crankshaft to the outside. On the other hand, during the suction, compression, and exhaust processes, the flywheel releases energy, converting the rotational motion of the crankshaft into linear motion of the piston.

2、沼氣發電機組配氣機構配氣機構的作用是根據發動機的工作順序和工作過程，定時開關進氣閥和排氣閥，使可燃混合氣或空氣進入氣缸，廢氣從氣缸內排出，實現通風過程。 配氣機構大多采用頂置閥式配氣機構，一般由閥單元、氣門單元、氣門驅動單元構成。

2. The function of the gas distribution mechanism of the biogas generator set is to regularly open and close the intake and exhaust valves according to the working sequence and process of the engine, allowing combustible mixture or air to enter the cylinder, and exhaust gas to be discharged from the cylinder, achieving the ventilation process. Most valve mechanisms use overhead valve type valve mechanisms, which are generally composed of valve units, valve units, and valve drive units.

3、沼氣發電機組燃油供給系統汽油機燃油供給系統的作用是根據發動機的要求配制一定量和濃度的混合氣，提供給氣缸，燃燒后的廢氣從氣缸內向大氣排放，柴油機燃油供給系統的作用是將柴油和空氣分別提供給氣缸沼氣發電機

3. The fuel supply system of the biogas generator set is used by the gasoline engine to prepare a certain amount and concentration of mixed gas according to the requirements of the engine, which is supplied to the cylinder. After combustion, the exhaust gas is discharged into the atmosphere from the cylinder. The function of the diesel engine fuel supply system is to provide diesel and air to the cylinder biogas generator separately

4、沼氣發電機組潤滑系統潤滑系統的作用是給做相對運動的零件表面輸送定量清潔的潤滑油，實現液體摩擦，減少摩擦阻力，減輕零件磨損，清洗、冷卻零件表面。 潤滑系統通常由潤滑油路、油泵、濾油器和幾個閥門等組成。

4. The function of the lubrication system of the biogas generator set is to deliver a quantitative amount of clean lubricating oil to the surface of the parts in relative motion, achieve liquid friction, reduce friction resistance, reduce part wear, and clean and cool the surface of the parts. The lubrication system usually consists of a lubricating oil circuit, an oil pump, an oil filter, and several valves.

5、沼氣發電機組冷卻系統冷卻系統的作用是將受熱部件吸收的部分熱量及時散熱，保證發動機在適合溫度下工作。 水冷發動機的冷卻系統通常由冷卻水套、水泵、風扇、水箱、恒溫器等組成。

5. The function of the cooling system of the biogas generator set is to timely dissipate the heat absorbed by the heated components, ensuring that the engine operates at a suitable temperature. The cooling system of a water-cooled engine usually consists of a cooling water jacket, water pump, fan, water tank, thermostat, etc.

6、沼氣發電機組點火系統所有能在火花塞電極之間按時產生火花的設備均為點火系統。 在汽油發動機中，氣缸內的可燃混合氣由火花點火。 因此，在汽油發動機的氣缸蓋上安裝了火花塞，火花塞的頭部深入燃燒室內。 點火系統通常由電池、發電機、分電器、點火線圈、火花塞等構成。

6. All devices that can generate sparks on time between the spark plug electrodes in the ignition system of biogas generator sets are ignition systems. In gasoline engines, the combustible mixture in the cylinder is ignited by a spark. Therefore, spark plugs are installed on the cylinder head of gasoline engines, and the head of the spark plug penetrates deep into the combustion chamber. The ignition system usually consists of a battery, generator, distributor, ignition coil, spark plug, etc.

7、沼氣發電機組起動系統發動機從靜止狀態過渡到工作狀態，先須通過外力旋轉發動機曲軸，使活塞往復運動。 氣缸內可燃混合氣燃燒膨脹做功，只有壓下活塞帶動曲軸旋轉，發動機才能自轉，工作循環自動進行。 因此，從曲軸因外力開始旋轉到發動機自動開始怠速運轉的全過程稱為發動機起動。 完成起動過程所需的裝置稱為發動機的起動系統。 汽油機由曲柄連桿機構、配氣機構、燃燒供給系統、潤滑系統、冷卻系統、點火系統、起動系統兩個機構和五個系統構成;柴油發動機由曲柄連桿機構、配氣系統、燃料供給系統、潤滑系統、冷卻系統、起動系統兩個機構和四個系統構成，柴油發動機為壓縮燃燒，不需要點火系統。

7. The starting system of a biogas generator set requires the engine to transition from a stationary state to a working state by first rotating the engine crankshaft through external force, causing the piston to move back and forth. The combustion and expansion of the combustible mixture in the cylinder do work. Only by pressing the piston to drive the crankshaft to rotate can the engine rotate and the working cycle automatically proceed. Therefore, the entire process from the crankshaft rotating due to external force to the engine automatically starting to idle is called engine starting. The device required to complete the starting process is called the engine's starting system. A gasoline engine consists of two mechanisms and five systems: a crank connecting rod mechanism, a valve distribution mechanism, a combustion supply system, a lubrication system, a cooling system, an ignition system, and a starting system; A diesel engine consists of two mechanisms and four systems: a crank connecting rod mechanism, a valve distribution system, a fuel supply system, a lubrication system, a cooling system, and a starting system. The diesel engine is a compression combustion engine and does not require an ignition system.

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