Improved normally-closed type door closer

Abstract

The invention relates to the technical field of home, and discloses an improved normally-closed type door closer which comprises a shell, a constant-pressure cavity, a hydraulic cavity, a stroke cavity and a piston rod. A constant-pressure oil way is formed in the inner wall of the shell and makes the constant-pressure cavity communicate with an inner cavity of the hydraulic cavity. The end, located in the stroke cavity, of the piston rod is fixedly connected with a strip-shaped magnet. By arranging the constant-pressure oil way and making the constant-pressure cavity communicate with the inner cavity of the hydraulic cavity through the constant-pressure oil way, in a front half route of rightward movement of a plunger, the hydraulic oil mainly flows through the constant-pressure oil way,the damping effect is quite small, that is, the resistance is low and labor-saving opening is easy when a front half corner section of a door is opened, the constant-pressure oil way completely entersthe constant-pressure cavity when a rear half corner section of the door continues to be opened, a throttling hole has a main throttling and damping effect, the door opening resistance is high, at the moment, the door cannot continue to be pushed open by general behaviors when people go through the door without being affected, and therefore the labor-saving door opening can be realized, and a spring can be protected against large pressure strain.

Description

technical field [0001] The invention relates to the field of household technology, in particular to an improved normally closed door closer. Background technique [0002] 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 has the function of a spring door, which can ensure that the door is closed to the initial position accurately and in time after it is opened. , which is often used on doors that need to be normally closed. [0003] When some normally closed doors are opened more frequently, due to the built-in hydraulic damping effect, the door basically maintains the set speed for opening and closing at a constant speed. For some people who need to open quickly, it needs to consume a large thrust, and frequent use When it is necessary to open the door to a larger angle or even the maximum stroke angle, this will easily cause fatigue strain on the compression sp...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the use of the existing door closers proposed in the background technology, the present invention provides an improved normally closed door closer, which has the advantages of frequent in-and-out door closer internal component protection and convenient daily use , to solve the problems raised in the above background technology

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