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四川资中县银山区农机站研制了一种橡皮嘴单向阀节油器,装在单缸四冲程柴油机上,经四川省农机鉴定站测定可比原机节约机油23%,而每只橡皮嘴只要0.14元,改制一台仅需0.4元。目前全省已在一些S195柴油机、工农—12手扶拖拉机上推广应用。橡皮嘴系用耐油橡胶经硫化制成的中空锥形扁管(见图),形似一鸭嘴。它装在齿轮室盖的通气管上,起一单向阀的作用。柴油机工作时,因活塞往复运动,曲轴箱内气体的容积和压力均发生变化。在活塞下行时,容积变小,气压增高,当大于一个大气压时,箱内的气体推开闭合的橡皮嘴进入大气;反之,在活塞上行时,容积变大,气压下降,当低于一个大气压时,橡皮嘴在大气压力和自身弹力的作用下而闭合,防止大气进入曲轴箱,活塞继续上行,曲轴箱容积继续扩大,气体压力继续下降,上述过程随活塞的往复
Sichuan Zizhong Yinshan Agricultural Machinery Station developed a rubber mouth check valve fuel economy, installed in a single cylinder four-stroke diesel engine, the Sichuan Provincial Agricultural Machinery Identification Station Determination of the original machine can save 23% of oil, and each rubber mouth as long as 0.14 yuan, a restructuring of only 0.4 yuan. At present, the province has been promoting some S195 diesel engines, workers and peasants -12 walking tractors. Rubber mouth with oil-resistant rubber tube made of hollow conical flat tube (see photo), shaped like a duck bill. It is mounted on the vent cover of the gear chamber and serves as a one-way valve. Diesel engine work, due to reciprocating piston, the crankcase gas volume and pressure have changed. When the piston goes down, the volume becomes smaller and the pressure increases. When the pressure is higher than 1 atm, the gas in the tank pushes open the closed rubber mouth into the atmosphere. On the contrary, when the piston goes up, the volume increases and the pressure decreases. When the pressure drops below 1 atm , The rubber mouth closes under the action of atmospheric pressure and self-elasticity to prevent the air from entering the crankcase, the piston continues to ascend, the crankcase volume continues to expand, and the gas pressure continues to decrease. The above process follows the reciprocating motion of the piston