The simple working principle of the door closer is that there is a hydraulic device similar to a spring on the door head. When we open the door, the door closer can be compressed and released, and finally the door is automatically closed. The function of a spring is to ensure that after our door is opened, it can return to the closed state in time and accurately.
Invention of the door closer
Now the door closer we are talking about is called hydraulic door closer, which was founded in the early twentieth century in the United States. The core of the design of the hydraulic door closer is to realize the control of the door. The door can be closed by itself, so as to limit the spread of the fire and the ventilation of the fire place.
How door closers work
When the door is opened, the door body drives the connecting rod and uses the rotation of the transmission gear to drive the rack column to move to the right. When the plunger moves to the right, it will be compressed by the spring, and the hydraulic oil in the right chamber will also be compressed at the same time. The one-way valve ball on the left side of the plunger will open under the action of oil pressure, and the hydraulic oil in the right cavity flows into the left cavity through the one-way valve. When the door opening process is completed, since the spring is compressed during the opening process, the accumulated elasticity is bound to be released, and the plunger is pushed to the left to drive the transmission gear and the connecting rod of the door closer to rotate, so that the door is closed.
The working principle of the door closer mentioned above is a bit professional, but it should be able to understand if you look closely. In addition, what accessories are involved in the closure?
Support guides, transmission gears, return springs, check valves, rack plungers, shut-off valves and housings, end caps, sealing rings and connecting rods.