柴油發(fā)電機組油霧保護系統(tǒng)的工作原理：

油霧保護系統(tǒng)的主要保護元件是油霧探測器，它能及時檢測出有否因軸承過熱或活塞環(huán)損傷造成過量漏氣等故障而導(dǎo)致在曲軸箱內(nèi)形成油霧，從而監(jiān)視柴油機的主要運行部件——曲軸和氣缸的工作狀況是否正常。在柴油機運行過程中它通過采樣管系不停地抽出曲軸箱內(nèi)的油氣，并送至一個靈敏且準(zhǔn)確的濃度測量裝置。該濃度測量裝置包括一個紅外線發(fā)射二極管和對側(cè)一個光電接收二級管。光電二級管感受紅外線產(chǎn)生的光強度，并將光強度信號轉(zhuǎn)換為電信號送至電子鑒定裝置。如果曲軸箱氣體含有油霧（使得濃度測量裝置測量通道的不透明度增加），部分紅外線會在測量管內(nèi)被吸收，光強度會減弱，因而電信號減弱。濃度越高電信號減弱越多，當(dāng)電信號降低到一個最低限值時（即油霧濃度超過最大限值時），電子鑒定裝置將發(fā)出“油霧探測器高油霧”警報并停機，同時閥箱指示出是哪一部分故障引起的高油霧，以供檢修人員檢查。

The working principle of the oil mist protection system for diesel generator sets:

The main protective component of the oil mist protection system is the oil mist detector, which can timely detect whether there is excessive air leakage caused by bearing overheating or piston ring damage, resulting in the formation of oil mist in the crankcase, thereby monitoring the working condition of the main operating components of the diesel engine - the crankshaft and cylinder. During the operation of the diesel engine, it continuously extracts oil and gas from the crankcase through a sampling pipe system and sends it to a sensitive and accurate concentration measurement device. The concentration measurement device includes an infrared emitting diode and a photoelectric receiving diode on the opposite side. The photoelectric diode senses the light intensity generated by infrared radiation and converts the light intensity signal into an electrical signal, which is sent to the electronic identification device. If the crankcase gas contains oil mist (which increases the opacity of the measurement channel of the concentration measuring device), some infrared rays will be absorbed inside the measuring tube, and the light intensity will be weakened, resulting in a decrease in the electrical signal. The higher the concentration, the weaker the electrical signal. When the electrical signal drops to a minimum limit (i.e. when the oil mist concentration exceeds the maximum limit), the electronic identification device will issue an "oil mist detector high oil mist" alarm and shut down. At the same time, the valve box will indicate which part of the fault is causing the high oil mist for inspection by maintenance personnel.