关键词: 农用柴油机, 除气机构, 供油道, 莫菲氏管

Abstract: When the agricultural diesel engine runs out of fuel and the fuel tank is refueled again, the fuel supply is interrupted, and it is difficult to start due to the gas entering the fuel circuit. To address this issue, a new simple and reliable degassing mechanism for the fuel supply channel of agricultural diesel engines is proposed based on the principle of the medical Murphy tube. Comparative tests were conducted on emission performance, fuel consumption, and starting performance of diesel engines before and after the installation of the degassing mechanism. The results show that the mean values of opacity (N) before and after the installation of the degassing mechanism were 12.89% and 13.246%, respectively. The mean values of the light absorption coefficient (K) were consistent at 0.35 m-1 before and after the installation. The mean values of fuel consumption (G) per hour before and after the installation were 1.324 L and 1.222 L, with a standard deviation of less than 3%. The measured values of N, K, and G decreased with the use of the degassing mechanism, indicating an improvement in emission performance, fuel economy, and operational stability. The diesel engine equipped with degassing mechanism significantly improved starting performance, enabling normal operation of the engine under all working conditions. The degassing mechanism effectively exhausts the gas from the diesel engines fuel supply system, showing practical significance and broad application prospects.

Key words: agricultural diesel engine, degassing mechanism, oil supply passage, Murphys tube