First, the principle of door closer
The working principle of the door closer is that when the door is opened, the door body drives the connecting rod and rotates the transmission gear to drive the rack plunger to move to the right. The spring is compressed during the movement of the plunger to the right 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 effect of oil pressure, and the hydraulic oil in the right cavity flows through the one-way valve to the left cavity. When the door opening process is completed, since the spring is compressed during the opening process, the accumulated elastic potential energy is released, the plunger is pushed to the left, and the transmission gear and the door closer link are rotated to close the door.
During the spring release process, since 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 in the plunger and 2 The flow path with the throttle body is returned to the right chamber. Therefore, the hydraulic oil constitutes a resistance to the release of the spring, that is, through the throttling to achieve the buffering effect, the speed of closing the door is controlled. The throttle valve on the valve body can be adjusted to control the variable door closing speed in different stroke sections. Although there are differences in the structure and size of the door closers produced by different manufacturers, the principle is the same.
Second, the special function of the door closer
With the above knowledge, you can communicate this to your friends, but the secret of the door closer is more than this. In addition to the basic function of automatic door closing, different door closers have different adjustment options and special Features:
1. The speed of closing is adjustable
The trajectory of the door leaf closing is a 90 degree arc, and the area where the door closing speed can be adjusted is generally within the range of 10 degrees to 90 degrees.
2, delay function
The delay feature does not automatically close the door closer. For example, when you push a wheelbarrow or heavy object through the door leaf, the door body can be delayed for a few seconds before returning to the normal closing speed, which is more convenient for people to pass, compared to the normal closing time of most doors of 5-10 seconds. The door closer can be adjusted up to a delay of two minutes or more.
3, adjustable locking speed
The door you see is in the final 0-10 degree zone. The speed at which the door closes in this area is called the lock speed. The door closer with adjustable locking speed has a locking speed regulating valve. By adjusting the valve, it allows you to adjust the closing speed to ensure that any bolt can enter the locking plate and complete the locking action.
4, stop the door function
It seems that there is a contradiction with the door closer requiring automatic closing. However, the use of this feature may be useful in some situations, such as requiring the door to stay open at a certain moment in the loading area. We usually use the door stop block on the door closer arm. When we set the door stop angle, the door leaf will open to a certain angle and it will stop. When the manpower exceeds this angle, the door will return to the automatic closing state. . However, please note that door closers with a door stop function are forbidden on fire doors!
5, open the buffer function
Advanced door closers usually have an open-door cushioning function so that when the door opening force is too large, it will not hit the adjacent wall because the door opening speed is too fast.
Third, the door closer price
1. Ken Lang fireproof door closer B804
Price: 162 yuan
2. Pepsi Hidden Door Hidden Door Closer
Price |: 188 yuan
3ã€vexg/GMT series door closers
Price: 90 yuan
After reading the introduction of Xiao Bian, did everyone understand more about the principle of the door closer? I hope this article can help everyone.
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