工作原理：
Working principle：
当线圈通电时，衔铁及托板被铁心吸引而瞬时下移，使瞬时动作触点接通或断开。但是活塞杆和杠杆不能同时跟着衔铁一起下落，因为活塞杆的上端连着气室中的橡皮膜，当活塞杆在释放弹簧的作用下开始向下运动时，橡皮膜随之向下凹，上面空气室的空气变得稀薄而使活塞杆受到阻尼作用而缓慢下降。经过一定时间，活塞杆下降到一定位置，便通过杠杆推动延时触点动作，使动断触点断开，动合触点闭合。从线圈通电到延时触点完成动作，这段时间就是继电器的延时时间。延时时间的长短可以用螺钉调节空气室进气孔的大小来改变。
When the coil is energized, the armature and the support plate are attracted by the iron core and move down instantaneously, so that the instantaneous action contact is connected or disconnected. But the piston rod and the lever can also follow the armature together down, because the upper end of the piston rod is connected with the rubber membrane in the gas chamber, when the piston rod downward movement under the effect of the release spring, rubber membrane along the concave, above the air chamber of the air getting thinner and the piston rod damping effect and slow drop by. After a certain period of time, the piston rod drops to a certain position, then pushes the delay contact action by the lever, causes the dynamic breaking contact to disconnect, and the dynamic contact closes. From the coil to the delay contact to complete the action, this time is the delay time of the relay. The length of the delay time can be adjusted by screw to adjust the size of the air inlet.
