Door closers all have automatic door stopping function. The door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be compressed and released to automatically close the door. It acts like a spring door and can ensure that the door closes to its initial position accurately and promptly after it is opened. .
Modern hydraulic door closers (referred to as door closers) began with a patent registered by Americans in the early twentieth century. It is different from traditional door closers in that it controls the liquid in the door closer. Throttle to achieve buffering effect. The core of the design idea of ??the hydraulic door closer is to control the closing process so that various functional indicators of the closing process can be adjusted according to human needs.
Extended information:
The working principle of the door closer:
When the door is opened, the door body drives the connecting rod to move and rotates the transmission gear. The plunger moves 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, since 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.
During the spring release process, due to the compression of the hydraulic oil in the left chamber of the door closer, the one-way valve is closed, and the hydraulic oil can only flow out through the gap between the housing and the plunger, and pass through the plunger. The small hole on the plug and the two flow channels equipped with the throttle valve core return to the right chamber. Therefore, the hydraulic oil forms a resistance to the spring release, that is, it achieves a buffering effect through throttling, so that the door closing speed is controlled.
The throttle valve on the valve body can be adjusted to control the variable closing speed of different stroke sections. Although the door closers produced by different manufacturers have different structures and sizes, the principle is the same. The types of door closers can be divided into: external and built-in door top door closers, built-in door door closers, door bottom door closers (floor springs), vertical door closers (built-in vertical door closers) door closers) and other types of door closers.
Baidu Encyclopedia - Electric Door Closer
Baidu Encyclopedia - Door Closer