Expiratory valve

Abstract

The invention discloses an expiratory valve. The expiratory valve comprises a valve bottom and a valve cover, a ventilation groove is formed in the middle of the upper surface of the valve bottom, struts are arranged surrounding the inner wall of the ventilation groove at equal distance, and an insertion rod is connected to the position among the ends, away from the inner wall of the ventilation groove, of the struts; first clamping blocks are arranged on the outer side of the valve bottom, a first step groove is formed in the upper surface of the valve bottom, and the first step groove is located between the two adjacent first clamping blocks; a valve plate is arranged on the inner side of the valve cover, the area of the valve plate is larger than that of the ventilation groove, a sleevepipe is arranged on the bottom surface of the valve plate, and the inner diameter of the sleeve pipe is equal to the outer diameter of the insertion rod. According to the expiratory valve, during assembly of the valve bottom and the valve cover, the dislocation combination means is adopted, while the interference fit locking means of the valve bottom and the valve cover is not adopted; in the condition of the same mounting area, the cross section area of the ventilation groove is maximized, the exhaust space is ensured, meanwhile the radial area of the whole expiratory valve is reduced, and the loss of the total filter area of a respirator is reduced.

Description

technical field [0001] The invention relates to the technical field of daily protective products, in particular to an exhalation valve. Background technique [0002] A mask is a sanitary product, generally refers to a device worn on the mouth and nose to filter the air entering the mouth and nose to block harmful gases, odors, and droplets from entering and exiting the wearer's mouth and nose, made of gauze or paper. Masks have a certain filtering effect on the air entering the lungs. When respiratory infectious diseases are prevalent, wearing a mask has a very good effect when working in a polluted environment such as dust. Masks are divided into masks with valves and masks without valves. Generally, masks with valves, compared with masks without valves, have lower exhalation resistance and are more comfortable to wear. [0003] The breathing valve is an important part of the mask with a valve. The working principle of the breathing valve is that the positive pressure of t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides an exhalation valve, which solves the problem that the valve bottom and the valve cover of the current respiration valve adopt an interference fit structure, which causes the bottom of the one-way valve to be welded, but the valve cover cannot be welded. or the cover of the valve is welded, but the bottom of the valve cannot be welded, and some parts of the valve are always easy to fall off; and the interference fit of the breathing valve must increase the matching position, and the bottom and cover must be increased. The thickness of the corresponding matching position causes the problem that the radial area of ​​the valve body is large, but the airflow through the hole is small

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