An Improved Normally Closed Door Closer

Abstract

The invention relates to the field of home furnishing technology, and discloses an improved normally closed door closer, which includes a housing, a constant pressure chamber, a hydraulic chamber, a stroke chamber, and a piston rod. The inner wall of the housing is provided with a constant pressure oil circuit. The pressure oil circuit connects the inner chamber of the constant pressure chamber and the hydraulic chamber, and one end of the piston rod located in the stroke chamber is fixedly connected with a bar magnet. In the present invention, by setting a constant pressure oil circuit, the constant pressure oil circuit connects the constant pressure chamber and the inner cavity of the hydraulic chamber. Therefore, in the first half of the stroke of the plunger moving to the right, the hydraulic oil is mainly connected by the constant pressure oil circuit, and its damping effect It is very small, that is, the resistance of people in the first half angle of opening the door is small, and it is easy to open with less effort. When the door continues to be opened in the second half angle, the constant pressure oil circuit completely enters the constant pressure chamber, and the orifice plays the main throttling damping The effect is that the door opening resistance is large. At this time, when it does not affect people passing through the door, the general behavior will not continue to push the opening of the door, so as to realize the energy-saving opening of the door and protect the spring from large compressive 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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