Door closer introduction

The door closer, as the name suggests, controls the closing process. The main function of the door closer is not only to ensure that the door is accurately and timely closed to the initial position after it is opened, but also to protect the door frame and door body. The door closer is a spring-like hydraulic device on the top of the door. When the door is opened, it can be closed automatically by compression, similar to a spring.

Under normal circumstances, door closers are mainly used in commercial places and public buildings. There are fewer home uses and door closers. The use of public places is mainly to make the door close by itself, which can be restricted in the event of a fire. The spread of the fire.


Door closer principle

The working principle of the door closer is: when the door is opened, the door body drives the connecting rod to move, and the transmission gear rotates to drive the rack plunger to move to the right. During the rightward movement of the plunger, the spring is compressed, and the hydraulic oil in the right cavity is also compressed. The check 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 into the left chamber through the check valve. When the door opening process is completed, as the spring is compressed during the opening process, the accumulated elastic potential energy is released, and the plunger is pushed to the left, which drives the transmission gear and the door closer link to rotate to close the door.

During the release of the spring, the hydraulic oil in the left chamber of the door closer is compressed and the check valve is closed. The hydraulic oil can only flow out through the gap between the housing and the plunger, and pass through the small hole on the plunger and 2 The flow channel with the throttle is returned to the right cavity. Therefore, the hydraulic oil constitutes resistance to the release of the spring, that is, the buffering effect is achieved by throttling, and the speed of closing the door is controlled. The throttle valve on the valve body can be adjusted to control the variable closing speed of different stroke sections. Although the structure and size of door closers produced by different manufacturers are different, the principle is the same.


Door closer installation

The installation of the door closer requires reading the manual first, and the installation position is determined according to the direction of opening the door, the strength of the door closing, and the installation dimensions between the door closer body, the connecting seat and the door hinge.

1. According to the position instruction of the installation manual, determine the position of the door closer screw, and then drill the hole;

2. Next, install the door closer body with screws, install the fixed connection seat, and install the drive board.

3. During installation, pay attention to adjust the adjustment lever to 90 ° with the door frame, and then connect the connecting rod with the drive board. Install a plastic cover, which can be used to catch the hydraulic oil leaking from the door closer;

4. After the door closer is installed, check whether the fixing screws are tight and there is no looseness or instability. Open the door to the maximum door opening position, and check whether the hinged swing arm of the door closer touches or rubs against the door or door frame. .

Door closer price

There are many factors to consider when choosing a door closer. The first is the type of door. Doors with different weights, such as wooden doors, aluminum alloy doors, and glass doors, the smaller the mass, the smaller the force the door closer can bear, and the smaller the selected model.


Warm reminder: It is recommended that when purchasing door closers, if the frequency of door opening and closing is used, the quality of door closers is the key. And for the occasions with frequent use, the door closer products should be required to have good sealing performance and long service life.


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