The working principle of the door closer is: when the door is opened, the door body drives the connecting rod to move and rotate the transmission gear, driving the rack plunger to move to the right. When the plunger moves to the right, the spring is compressed and the hydraulic oil in the right chamber is also pressurized. The one-way valve ball on the left side of the plunger opens under the action of oil pressure, and the hydraulic oil in the right chamber flows to the left chamber through the one-way valve.
When the door opening process is completed, because the spring is compressed during the opening process, the accumulated elastic potential energy is released, pushing the plunger to the left, driving the transmission gear and the door closer connecting rod to rotate, causing the door closer to open. The door is closed.
Extended information:
Advantages of door closers
1. The closing speed is adjustable
The closing trajectory of the door leaf is a 90-degree In arc shape, the area where the closing speed can be adjusted is generally in the range from 10 degrees to 90 degrees when the door leaf is opened.
2. The locking speed is adjustable
The door closer with adjustable locking speed has a locking speed adjustment valve. By adjusting the valve, it allows you to adjust the closing speed. speed to ensure that any lock tongue can enter the lock plate and complete the locking action.
3. Opening buffer function
Advanced door closers usually have an opening buffering function, so that when the door opening force is too large, it will not hit the adjacent wall due to the excessive opening speed. .
4. Delay function
The delay function prevents the door closer from automatically closing the door immediately. This makes it easier for people to pass through, and the door closer can be adjusted to delay up to two minutes or more compared to the normal closing time of most doors of 5-10 seconds.
Baidu Encyclopedia-Door Closer