二、活塞的原理直升式活塞是一种园筒形的活塞,活塞芯可在严密的园筒中自由上下,一只螺旋式的弹簧使活动的活塞芯保持在开放的位置,芯体上有三条横斜的通道。第一条通道(最下面的一条)接通从号咀的导气管和出口至喇叭口的总管。当活塞开放时,气流仅通过 Second, the piston principle Helicopter piston is a cylindrical piston, the piston core can be freely up and down in a tight cylinder, a spiral spring so that the activities of the piston core in an open position, the core has Three horizontal oblique passage. The first channel (the lowermost one) connects the airway from the nozzle and the manifold to the bell mouth. When the piston is open, the air flow passes only