Anti-return exhaust valve structure with isolated valve cavity

By adopting a dual-valve box assembly structure and an inter-valve isolation chamber design in the dust mask, the problems of poor sealing, poor exhaust, and delayed valve closure caused by dust accumulation in the one-way exhaust valve are solved, thereby improving the protective performance and wearing comfort.

CN121243665APending Publication Date: 2026-01-02DONGGUAN PINMING ELECTRONICS CO LTD
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Patent Information

Application Number
CN202511393231.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-27
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Existing dust masks, gas masks, and valved masks suffer from problems such as poor sealing, poor exhaust, and delayed valve closure due to dust accumulation in the one-way exhaust valve during use, affecting user comfort and safety.

Method used

The system adopts a dual-valve box assembly structure, including an outer valve plate and an inner valve plate, forming an inter-valve isolation cavity. Through the Venturi effect and the trapping effect of the low-pressure eddy zone, combined with the principle of micro-condensation and deposition of moisture, the matching method of the outer valve plate and the inner valve plate is designed to ensure the gas flow path and dust blocking effect.

Benefits of technology

It effectively solves the problems of poor sealing, poor ventilation, and delayed valve closure caused by dust blockage, improves the product's protective performance and wearing comfort, and reduces the burden of cleaning and inspection for users.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention discloses a dustproof and anti-poison series labor protection appliance, and particularly relates to a valve cavity isolation anti-return exhaust valve structure. The mask comprises a mask shell, a double-valve-box assembly, an inter-valve isolation cavity, a valve plate positioning nail, an outer valve plate, an outer sealing opening, an inner sealing opening, an inner valve plate, a filter box clamping position and an air filter box. The double-valve-box air exhaust valve is mainly characterized in that a traditional one-way air exhaust valve is replaced with a double-valve-box assembly, an inter-valve isolation cavity is formed between an outer valve plate and an inner valve plate, and dust is blocked through the Venturi effect and the trapping effect of a low-pressure vortex area; even if dust is clamped between the outer valve plate and the outer sealing opening, the dust can be removed during next expiration, and it is guaranteed that no dust is accumulated on the edge of the inner valve plate. The problems that an existing dustproof mask, an existing gas mask and an existing mask with a valve are not tightly closed, exhaust is not smooth, and closing of a valve plate is delayed due to the fact that dust is stuck to a sealing opening are solved, and the protection performance and the wearing comfort are improved.
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