The time relay is a control device that realizes delay control by using electromagnetic principle or mechanical principle.
There are many types of relays, such as air damping type, electric type and electronic type.
Air-damped time relays are often used in AC circuits, which use the principle of air throttling through small holes to obtain delayed action. It consists of three parts: the electromagnetic system, the delay mechanism and the contacts.
The time relay can be divided into two types: power-on delay type and power-off delay type.
The air damping type time relay has a large delay range (0.4 to 60 s and 0.4 to 180 s), and has a simple structure but low accuracy.
When the coil is energized (voltage specifications are ac380v, ac220v or dc220v, dc24v, etc.), the armature and the pallet are attracted by the core and instantaneously moved down, so that the instantaneous action contact is turned on or off. However, the piston rod and the lever cannot fall together with the armature because the upper end of the piston rod is connected to the rubber film in the air chamber. When the piston rod starts to move downward under the action of the release spring, the rubber film is then concave downward. The air in the air chamber becomes thin and the piston rod is dampened and slowly descends. After a certain period of time, the piston rod is lowered to a certain position, and the delay contact is actuated by the lever, so that the breaking contact is opened and the moving contact is closed. From the energization of the coil to the completion of the delay contact, this time is the delay time of the relay. The length of the delay time can be changed by adjusting the size of the air inlet of the air chamber with a screw.
After the attracting coil is de-energized, the relay is restored by the action of the return spring. Air is quickly expelled through the vent.
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