Anti-return exhaust valve structure with isolated valve cavity

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.

Description

Technical Field

[0001] This invention relates to the technical field of labor protection products, and in particular to the structure of a valve cavity isolation anti-backflow exhaust valve. Background Technology

[0002] In the field of occupational safety and health products, dust masks, gas masks, and dust respirators are widely used in mining, metal smelting and processing, construction, chemical industry, machinery manufacturing, and sandstorm protection, serving as essential tools for protecting people from dust and other fine particulate matter. Statistics show that the market size for dust masks and dust respirators exceeded 10 billion RMB in 2024 and continues to grow year by year. However, several technical issues commonly encountered during the use of these products urgently need to be addressed.

[0003] For high-protection dust protective gear, the trade-off between breathability and protective performance is particularly prominent. Higher protective performance often results in poorer breathability; therefore, most high-efficiency dust masks and face shields are equipped with one-way exhaust valves to improve wearing comfort. However, existing one-way exhaust valve designs have several drawbacks. First, because exhaled air contains moisture, the area around the exhaust valve becomes damp after prolonged wear, especially in high-dust environments, where dust easily accumulates on the valve edge. This accumulation not only affects the valve's flexible opening and closing but can also cause the seal to become clogged with dust, preventing the valve from closing completely. This allows external air containing dust or harmful gases to directly enter the mask, posing a threat to the user's health. Second, existing one-way exhaust valve designs struggle to balance the conflict between valve opening and closing speed: too small an opening leads to poor exhaust, while too large an opening may delay closure, increasing the risk of external contaminants entering. Furthermore, to ensure safety, designers typically allow a large safety margin in the valve opening, but this further limits exhaust efficiency and affects wearing comfort.

[0004] From a technical perspective, the root causes of the aforementioned problems mainly involve the intersection of fluid mechanics, particulate dynamics, and materials surface science. Specifically, firstly, there is the Venturi effect: when high-speed flowing gas passes through the valve outlet, a low-pressure zone is formed around the outlet, causing dust from the outside air to concentrate and flow towards this area. Secondly, there is the adsorption and sedimentation effect of the low-pressure vortex zone: the vortex formed by the high-speed airflow at the valve outlet and the low-pressure zone at the outer edge acts like a miniature cyclone, trapping fine particles within the low-pressure zone. Simultaneously, particles with different charges attract each other within the vortex, exacerbating dust accumulation. Thirdly, there are condensation and deposition factors: exhaled air contains trace amounts of water vapor and oils, which create a sticky environment in the low-pressure vortex zone, significantly increasing the adhesion rate of dust particles. These problems collectively lead to frequent issues such as valve jamming, poor sealing, and obstructed exhaust in existing dust masks, gas masks, and valved masks during actual use. This forces users to regularly disassemble and clean the exhaust valve, which is cumbersome and adds psychological burden.

[0005] In summary, existing technologies have significant shortcomings in solving problems such as dust clogging, seal failure, and low exhaust efficiency in one-way exhaust valves. An innovative structure is urgently needed to fundamentally improve these problems and enhance product reliability and user experience. This invention is a solution proposed based on this need. Summary of the Invention

[0006] The purpose of this invention is to provide a valve cavity isolation anti-backflow exhaust valve structure to overcome the shortcomings of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention addresses the technical problems of poor sealing, inadequate exhaust, and delayed valve closure caused by dust accumulation in the one-way exhaust valve of existing dust masks, gas masks, and various types of valved dust masks during use. It proposes a valve cavity isolation anti-backflow exhaust valve structure. This structure solves the aforementioned technical problems by incorporating a dual-valve box assembly and forming an inter-valve isolation cavity within it.

[0008] This invention provides a valve cavity isolation anti-backflow exhaust valve structure, including a mask shell, a dual valve box assembly, an intervalve isolation chamber, valve plate positioning pins, an outer valve plate, an outer sealing port, an inner sealing port, an inner valve plate, a filter box holder, and an air filter box. Specifically: the mask shell, as the main body of the entire dust mask, provides basic protective functions and is designed with snap-fit ​​positions to secure the air filter box; the dual valve box assembly is installed at the exhaust valve position on the mask shell, replacing the traditional one-way exhaust valve; the intervalve isolation chamber is located inside the dual valve box assembly and is formed by the space between the outer and inner valve plates; the valve plate positioning pins are used to fix the positions of the outer and inner valve plates, ensuring their normal opening and closing; the outer valve plate cooperates with the outer sealing port, opening when exhaling exhaust gas and closing when inhaling air; the inner valve plate cooperates with the inner sealing port, opening when exhaling exhaust gas and closing when inhaling air.

[0009] Furthermore, the design of the dual-valve box assembly incorporates multiple adjustable parameters to adapt to different application requirements. The volume and orientation of the inter-valve isolation chamber can be adjusted according to actual needs, thereby optimizing the gas flow path and dust barrier effect. Multiple sealing methods are available between the outer valve plate and the outer sealing port, and between the inner valve plate and the inner sealing port, such as using elastic materials to achieve a tight fit or enhancing sealing performance through mechanical structures. The valve plate positioning pins also offer multiple fixing methods, including threaded connections, snap-fit ​​fixing, or other methods to achieve stable support for the valve plates.

[0010] Specifically, this invention achieves effective dust blocking by utilizing the Venturi effect and the trapping effect of the low-pressure vortex zone, combined with the principle of micro-condensation and deposition of moisture. Specifically, high-speed flowing gas creates a low-pressure zone around the valve outlet, causing dust from the outside air to concentrate and flow towards this zone. During this process, vortex adsorption and sedimentation further intensify dust accumulation in the low-pressure zone. Furthermore, exhaled breath contains trace amounts of water vapor and oils, which become sticky in the low-pressure vortex zone, increasing the adhesion success rate of dust particles. However, by designing an inter-valve isolation chamber, even if dust is trapped between the outer valve plate and the outer sealing port, the next high-speed exhaled exhaust gas will wash away the dust, thus ensuring that no dust accumulates at the edge of the inner valve plate.

[0011] Furthermore, the specific implementation of the present invention is as follows: S1, when the user inhales air, the outer valve plate and the outer sealing port, and the inner valve plate and the inner sealing port are all in a closed and sealed state, allowing only the air filtered by the air filter box to enter the mask shell; S2, when the user exhales waste gas, the outer valve plate and the outer sealing port, and the inner valve plate and the inner sealing port are opened by the pressure of the waste gas, and the waste gas enters the valve isolation chamber; S3, if dust accumulates or gets stuck around the outer sealing port due to the Venturi effect, saliva, and eddies, it will not affect the normal opening and closing of the inner sealing port and the inner valve plate; S4, the dust accumulation or getting stuck around the outer sealing port will be cleared the next time waste gas is exhaled, and in particular, dust or toxic gas will never be able to reach the vicinity of the inner sealing port and the inner valve plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: First, it alleviates the problem of slow closing caused by a large valve opening. In traditional one-way exhaust valves, designers typically allow a safety margin in the valve opening to ensure absolute sealing during inhalation. However, this design sacrifices the smooth flow of exhaled gas. This invention, by placing an outer valve outside the inner valve and forming an inter-valve isolation chamber, ensures that even if the inner valve closes slowly due to a large opening, the returning gas is only the exhaled gas, not unfiltered air directly entering the inner seal. Therefore, the safety margin can be appropriately reduced when designing the valve opening, thereby improving the smoothness of exhaust gas discharge.

[0013] Secondly, it solves the problem of inflexible opening and closing caused by dust blockage. Traditional one-way exhaust valves have only one valve plate, whose edges easily accumulate dust in the vortex zone, causing the valve plate to be inflexible in opening and closing or even unable to close. This invention sets up an outer valve plate and an inner valve plate to form an inter-valve isolation cavity. Even if dust accumulates at the edge of the outer sealing port, the dust cannot enter the inter-valve isolation cavity, and it will not affect the flexible opening and closing of the inner valve plate.

[0014] Secondly, this invention solves the problem of incomplete sealing caused by dust getting stuck in the sealing port. Traditional one-way exhaust valves are prone to dust adhesion, preventing a complete seal and allowing dust or toxic gases to enter the mask's outer shell. This invention, through the design of an inter-valve isolation chamber, ensures that the air inside is always discharged outwards, preventing dust from entering at all. Even if dust occasionally adheres to the outer sealing port, it will be automatically blown away with the next exhaled breath, thus absolutely guaranteeing a tight seal between the inner sealing port and the inner valve plate.

[0015] Finally, it eliminates the burden on users who need to frequently inspect and clean the one-way exhaust valve. In dusty or toxic gas workplaces, traditional one-way exhaust valves easily accumulate dust, requiring frequent inspection and cleaning, which causes psychological stress for users. This invention, through the design of the valve isolation chamber, completely isolates the possibility of dust entering, eliminating users' worries about valve plate jamming or poor sealing, thus relieving their psychological burden.

[0016] In summary, this invention effectively solves various problems caused by dust accumulation in traditional one-way exhaust valves by setting an outer valve plate and an inner valve plate within the dual-valve box assembly to form an inter-valve isolation chamber. This structure not only improves the product's protective performance but also enhances user comfort and safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the valve cavity isolation anti-backflow exhaust valve structure of the present invention used on a dust mask; Figure 2 This is a schematic diagram of the air filter box structure of the present invention.

[0018] The attached figures are labeled as follows: 1—Mask housing, 2—Dual valve box assembly, 3—Valve isolation chamber, 4—Valve plate positioning pin, 5—Outer valve plate, 6—Outer sealing port, 7—Inner sealing port, 8—Inner valve plate, 9—Filter box holder, 10—Air filter box. Detailed Implementation

[0019] A valve cavity isolation anti-backflow exhaust valve structure, its core design lies in the setting of a double valve box assembly and an inter-valve isolation chamber, which effectively solves the technical problems of poor sealing, poor exhaust, and delayed valve plate closing caused by dust accumulation in traditional one-way exhaust valves during use. The following, in conjunction with the appendix... Figure 1 and attached Figure 2 The specific embodiments of the present invention will be described in detail below.

[0020] like Figure 1 As shown, the valve cavity isolation anti-backflow exhaust valve structure of the present invention includes a mask housing 1, a dual valve box assembly 2, an inter-valve isolation chamber 3, a valve plate positioning pin 4, an outer valve plate 5, an outer sealing port 6, an inner sealing port 7, an inner valve plate 8, a filter box locking position 9, and an air filter box 10. These components together constitute a complete dust mask system. The mask housing 1, as the main body, provides basic protective functions and is tightly connected to the air filter box 10 via a locking position provided on one side of the filter box locking position 9. This locking design ensures that the air filter box 10 will not easily fall off after installation and facilitates quick replacement of the filter box by the user. The air filter box 10 contains filter material, which can effectively filter dust and toxic gases in the air entering the mask, thereby protecting the user's respiratory safety.

[0021] The dual-valve box assembly 2 is one of the core components of this invention, located in the traditional one-way exhaust valve mounting area of ​​the mask housing 1. The dual-valve box assembly 2 replaces the traditional one-way exhaust valve, forming a more efficient and reliable gas flow path. The dual-valve box assembly 2 consists of an outer sealing port 6 and an inner sealing port 7, forming an inter-valve isolation chamber 3 between them. The size and orientation of the inter-valve isolation chamber 3 can be adjusted according to actual needs to optimize the gas flow path and dust containment effect. For example, in some applications, the volume of the inter-valve isolation chamber 3 can be designed to be larger to enhance its dust collection capacity; while in other applications, a smaller volume can be selected to reduce the overall volume occupied. Furthermore, the orientation of the inter-valve isolation chamber 3 can also be flexibly adjusted according to specific needs, such as designing it horizontally or at an angle to adapt to the gas flow characteristics under different working environments.

[0022] The valve plate positioning pin 4 is used to fix the position of the outer valve plate 5 and the inner valve plate 8, ensuring their normal opening and closing action. The valve plate positioning pin 4 can be fixed in various ways, such as through threaded connection, snap-fit ​​fixing, or other mechanical structures to achieve stable support for the valve plates. The outer valve plate 5 cooperates with the outer sealing port 6, opening when exhaling exhaust gas and closing when inhaling air; similarly, the inner valve plate 8 cooperates with the inner sealing port 7, opening when exhaling exhaust gas and closing when inhaling air. The sealing methods between the outer valve plate 5 and the outer sealing port 6, and between the inner valve plate 8 and the inner sealing port 7, also have various options, such as using elastic materials to achieve a tight fit or enhancing sealing performance through mechanical structures. These diverse design options allow the present invention to adapt to different application requirements.

[0023] The working principle of this invention is based on the Venturi effect and the trapping effect of the low-pressure vortex zone, combined with the principle of micro-condensation deposition of moisture, to achieve effective dust blocking. When a user wears this dust mask and breathes, the gas flow process is as follows: S1, when the user inhales air, the outer valve plate 5 and the outer sealing port 6, and the inner valve plate 8 and the inner sealing port 7 are all in a closed and sealed state, allowing only the air filtered by the air filter box 10 to enter the mask shell 1. At this time, the filter material in the air filter box 10 efficiently filters the incoming air, ensuring that dust and toxic gases in the air are effectively intercepted. S2, when the user exhales exhaust gas, the outer valve plate 5 and the outer sealing port 6, and the inner valve plate 8 and the inner sealing port 7 are opened by the pressure of the exhaust gas, and the exhaust gas enters the valve isolation chamber 3. Since the exhaust gas contains trace amounts of water vapor and grease, these substances become sticky in the low-pressure vortex zone, increasing the adhesion success rate of dust particles. However, even if there is dust between the outer valve plate 5 and the outer sealing port 6, the exhaust gas exhaled at high speed will wash away the dust, thus ensuring that there is never any dust accumulation on the edge of the inner valve plate 8.

[0024] S3. If dust accumulates or gets stuck around the outer sealing port 6 due to the Venturi effect, saliva, or eddies, it will not affect the normal opening and closing of the inner sealing port 7 and the inner valve plate 8. This is because the existence of the intervalve isolation chamber 3 completely isolates the outer sealing port 6 from the inner sealing port 7. Even if dust accumulates near the outer sealing port 6, this dust cannot enter the intervalve isolation chamber 3, nor will it interfere with the normal operation of the inner valve plate 8. S4. The next time exhaust gas is exhaled, the dust accumulation or blockage around the outer sealing port 6 will be cleared, and in particular, dust or toxic gas will never reach the vicinity of the inner sealing port 7 and the inner valve plate 8. This design not only ensures that the edge of the inner valve plate 8 is always kept clean, but also significantly improves the operational reliability of the entire exhaust valve system.

[0025] The technical advantages of this invention are reflected in several aspects. First, it alleviates the problem of slow closing caused by a large valve plate opening. In traditional one-way exhaust valves, designers usually reserve a safety margin in the valve plate opening range to ensure absolute sealing during inhalation. However, this design sacrifices the smooth flow of exhaled exhaust gas. This invention, by setting an outer valve plate 5 outside the inner valve plate 8 and forming an intervalve isolation chamber 3, ensures that even if the inner valve plate 8 closes slowly due to a large opening range, the returned gas is only the exhaled gas, not unfiltered air directly entering the inner sealing port 7. Therefore, the safety margin can be appropriately reduced when designing the valve plate opening range, thereby improving the smooth flow of exhaust gas.

[0026] Secondly, it solves the problem of inflexible opening and closing caused by dust blockage. Traditional one-way exhaust valves have only one valve plate, whose edges easily accumulate dust in the vortex zone, causing the valve plate to be inflexible in opening and closing or even unable to close. This invention sets up an outer valve plate 5 and an inner valve plate 8 to form an inter-valve isolation chamber 3. Even if dust accumulates at the edge of the outer sealing port 6, the dust cannot enter the inter-valve isolation chamber 3, nor will it affect the flexible opening and closing of the inner valve plate 8. Thirdly, it solves the problem of poor sealing caused by dust stuck in the sealing port. The sealing port of traditional one-way exhaust valves is prone to failure to achieve a complete seal due to dust adhesion, causing dust or toxic gas to enter the mask shell 1. This invention, through the setting of the inter-valve isolation chamber 3, ensures that the air inside is always discharged outward, and dust cannot enter at all. Even if dust occasionally sticks to the outer sealing port 6, it will be automatically blown away when the exhaust gas is exhaled next time, thus absolutely ensuring a tight seal between the inner sealing port 7 and the inner valve plate 8.

[0027] Finally, it eliminates the burden on users who need to frequently inspect and clean the one-way exhaust valve. In dusty or toxic gas workplaces, traditional one-way exhaust valves easily accumulate dust, requiring frequent inspection and cleaning, which causes psychological stress for users. This invention, through the design of the valve isolation chamber 3, completely isolates the possibility of dust entering, eliminating users' worries about valve plate jamming or poor sealing, thus relieving their psychological burden.

[0028] In summary, this invention effectively solves various problems caused by dust accumulation in traditional one-way exhaust valves by setting an outer valve plate 5 and an inner valve plate 8 within the dual valve box assembly 2 to form an inter-valve isolation chamber 3. This structure not only improves the product's protective performance but also enhances user comfort and safety.

Claims

1. A valve cavity isolation anti-backflow exhaust valve structure, characterized in that: The device includes a mask housing (1), a dual valve box assembly (2), an intervalve isolation chamber (3), a valve plate positioning pin (4), an outer valve plate (5), an outer sealing port (6), an inner sealing port (7), an inner valve plate (8), a filter box holder (9), and an air filter box (10). The mask housing (1) provides protection and is connected to the air filter box (10) via the filter box holder (9). The dual valve box assembly (2) is installed at the exhaust valve position of the mask housing (1). The intervalve isolation chamber (3) is formed by the space between the outer valve plate (5) and the inner valve plate (8). The valve plate positioning pin (4) fixes the positions of the outer valve plate (5) and the inner valve plate (8). The outer valve plate (5) is used in conjunction with the outer sealing port (6), and the inner valve plate (8) is used in conjunction with the inner sealing port (7).

2. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 1, characterized in that: The design of the dual valve box assembly (2) includes multiple adjustable parameters to adapt to different application requirements.

3. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 2, characterized in that: The volume and orientation of the valve isolation chamber (3) can be adjusted according to actual needs.

4. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 1, characterized in that: The sealing method between the outer valve plate (5) and the outer sealing port (6) and between the inner valve plate (8) and the inner sealing port (7) is either a tight fit of elastic materials or a mechanical structure to enhance the sealing performance.

5. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 1, characterized in that: The valve plate positioning pin (4) provides stable support for the valve plate through threaded connection, snap-fit ​​fixing or other mechanical structures.

6. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 1, characterized in that: When the user inhales air, the outer valve plate (5) and the outer sealing port (6), and the inner valve plate (8) and the inner sealing port (7) are all in a closed state, allowing only the air filtered by the air filter box (10) to enter the mask shell (1).

7. The valve cavity isolation anti-backflow exhaust valve structure as described in claim 1, characterized in that: When the user exhales exhaust gas, the outer valve plate (5) and the outer sealing port (6), and the inner valve plate (8) and the inner sealing port (7) are opened by the exhaust gas pressure, and the exhaust gas enters the valve isolation chamber (3).

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