Before learning about electric door closers, first correct a problem. Many people used to open electric door closers automatically when people approached the door. In fact, this is not correct. The electric door closers mentioned here are more about opening the door without manual closing, and the door can also be closed automatically. After understanding this, we can look at the following explanation of electric door closers. (The following description is from Baidu Encyclopedia.)
Electric door closer, also known as automatic door closer releaser, electric door releaser, etc., is a mechanism that can automatically close the door leaf by means of electric control. The electric door closer is different from the hydraulic fire door closer. It combines the functions of the electromagnetic release and the non positioning door closer. Its interior is a solenoid valve and a strong spring. When the door is pushed, the spring is compressed and locked by the solenoid valve to keep the door normally open. When the power is supplied, the solenoid valve is released and closed by the rebound impact force of the spring, without buffering function.
Application of electric door closer
This kind of door closer was first applied to normally open fire doors. Later, the fire department did not promote its application in the fire door market because it believed that the power transmission door closing did not conform to the fire protection specifications. At present, the hydraulic automatic door closer is still used in the fire door market. But as far as the electric door closer itself is concerned, it doesn't make much sense.
The electric door closer is applicable to the normally open fire door, and its function is to make the fire door normally open. Combined with electromagnetic door stopper and door closer, the price has doubled. When the public selects the normally open fire door, it is better to use the door closer and electromagnetic door stopper for economic effect. The price of the 30 door closer+200 electromagnetic door stopper saves much more than the electric door closer.