Characteristic
1, air damping type time relay is also known as the airbag type time relay, which is based on the compressed air to produce resistance to delay, which has the advantages of simple structure, cheap price, delay range ( 0.4~180s ), but the delay precision of low. In 2, an electromagnetic type time relay delay time is short ( 0.3~1.6s ), but it has the advantages of simple structure, usually used in the power-off time delay setting and the DC circuit. In 3, motor time relay and the principle of similar clocks, it is composed of internal motor drives the gear to rotate and receive delay. The relay of high precision of time delay, time delay range ( 0.4~72h ), but the structure is more complex, the price is very expensive. In 4, a transistor time relay is also called electronic time relay, it is by the delay circuit to delay. This kind of relay with high precision, small volume. Time relay can be divided into conduction delay and power-off time delay type two types. Air damping type time relay as an example to illustrate the working principle of time relay
Air damping type time relay delay range ( 0.4～ 60s and 0.4 ～ 180s, two ), which has the advantages of simple structure, but lower accuracy. When the coil is energized, the armature and core plate is attracted and instantaneous downward, the instantaneous contacts to connect or disconnect. But the piston rod and lever cannot follow the armature falls down together, because the upper end of a piston rod is connected with a gas chamber in the rubber membrane, when the piston rod in the release under spring action began when moving downwards, rubber membrane with concave down, above the air chamber of the air gets thinner and the piston rod by the damping effect and slow down. After a certain period of time, the piston rod is reduced to a certain position, then through the lever drive time delay contact action, make break contact disconnect, dynamic close contact closure. From the coil is energized to time delay contact to complete the action, this time is the time delay relays. The length of the delay time can use screw air chamber air inlet to change the size of. Attract the coil power, relay relies on the recovery of the action of the spring and the restoration. The air through the vent was excreted rapidly. Time relay: when add or remove the input signals, output to delay or limit to the specified time to close or open the controlled circuit of relay.
参考传奇电器（http://www.315mro.com）
