A positive pressure air breathing apparatus full face mask with dual mode interface

Abstract

The application discloses a positive pressure air respirator full mask with a dual-mode interface and relates to the field of respiratory protection equipment, which comprises a full mask body, a gas supply interface seat in communication with the full mask body, a chemical oxygen interface seat in communication with the full mask body, a connecting mechanism arranged on the full mask body and used for connecting a chemical oxygen self-rescuer, a lever support fixed in the chemical oxygen interface seat, a sealing assembly arranged on the lever support and used for sealing an exhalation port of the chemical oxygen interface seat and a toggle mechanism arranged in the chemical oxygen interface seat and used for driving the sealing assembly to move. The application realizes the technical effects of the dual-mode interface function, the convenience in connection and disconnection with the chemical oxygen self-rescuer, the guarantee of effective sealing and opening of the exhalation port and the improvement of the reliability and practicality of the respiratory protection.

Description

Technical Field

[0001] This application relates to the field of respiratory protective equipment, and in particular to a positive pressure air respirator full face mask with a dual-mode interface. Background Technology

[0002] Positive pressure breathing apparatus is a "life barrier" for workers in high-risk environments. Its full-face mask, in conjunction with the air supply valve, air cylinder assembly, and pressure reducing assembly, provides clean air to the wearer while relying on internal positive pressure to isolate toxic and harmful gases from the outside.

[0003] When using a positive pressure respirator, the air supply valve of its cylinder assembly needs to be connected to the air supply interface seat. After the high-pressure air is reduced in pressure by the pressure reducer, it enters the air chamber inside the full-face mask body through the air supply valve to maintain a positive pressure state.

[0004] Running out of gas in cylinders is a core safety risk threatening workers. Currently, there is a method to extend breathing time by removing the gas supply valve from the full-face mask and inserting a chemical oxygen self-rescue device, thus switching from cylinder-based gas supply to chemical oxygen supply. The chemical oxygen self-rescue device continuously supplies oxygen through a chemical reaction, buying valuable evacuation time for workers.

[0005] During the emergency switch to chemical oxygen source by removing the gas supply valve and inserting the chemical oxygen self-rescue device, the internal air chamber of the full-face mask may be instantly connected to the toxic atmosphere outside, putting the wearer at risk of inhaling toxic gases, which poses a serious threat to the safety of the workers. Summary of the Invention

[0006] To address the risk of inhaling toxic gases when switching to a chemical oxygen source during an emergency, existing positive pressure breathing apparatus full-face mask provides a dual-mode interface positive pressure air breathing apparatus full-face mask.

[0007] The dual-mode interface positive pressure air respirator full face mask provided in this application adopts the following technical solution: A dual-mode interface positive pressure air respirator full face mask includes a full face mask body and an air supply interface seat connected to the full face mask body. The full face mask body is also connected to a chemical oxygen interface seat. The full face mask body is provided with a connecting mechanism for connecting a chemical oxygen self-rescue device. A lever bracket is fixed inside the chemical oxygen interface seat. A sealing component for sealing the exhalation port of the chemical oxygen interface seat is provided on the lever bracket. A toggle mechanism for driving the sealing component to move is provided inside the chemical oxygen interface seat.

[0008] By adopting the above technical solution, this full-face mask integrates an independent emergency chemical oxygen interface socket while retaining the original positive pressure air supply function. In normal air supply mode, the sealing components inside the chemical oxygen interface socket remain closed, ensuring the mask's airtightness. When switching to chemical oxygen emergency mode is required, the connector of the external chemical oxygen self-rescue device is connected to the chemical oxygen interface socket via a connecting mechanism. During this process, the insertion of the chemical oxygen self-rescue device connector triggers an internal actuating mechanism, which in turn drives the sealing components to move, thereby opening the exhalation port of the chemical oxygen interface socket, allowing oxygen generated by the chemical oxygen self-rescue device to enter the mask's internal air chamber for the wearer to breathe. The entire switching process is completed without disrupting the positive pressure inside the mask or exposing the wearer to external toxic environments, achieving a safe and rapid emergency gas source switching.

[0009] Optionally, the sealing assembly includes an exhalation valve rod passing through the lever bracket and an exhalation valve plate coaxially fixed to the exhalation valve rod. A return spring is provided inside the chemical oxygen interface seat, with both ends of the return spring fixed to the lever bracket and the exhalation valve plate, respectively. The exhalation valve plate is used to seal the exhalation port of the chemical oxygen interface seat.

[0010] By adopting the above technical solution, under normal conditions, the elasticity of the return spring makes the exhalation valve plate fit tightly against the exhalation port of the chemical oxygen interface seat, forming a reliable seal and preventing external toxic gases from entering the mask.

[0011] Optionally, an annular protrusion is fixed at the exhalation port of the chemical oxygen interface seat, and a base exhalation port sealing rib is fixed on the annular protrusion. Multiple connecting rods are evenly fixed on the inner wall of the exhalation port of the chemical oxygen interface seat, and an annular ring is fixed at the end of the multiple connecting rods. The end of the exhalation valve rod passes through the annular ring and is located inside the full-face mask body.

[0012] By adopting the above technical solution, the annular protrusion and the sealing rib of the exhalation port enhance the sealing performance at the exhalation port, effectively preventing the intrusion of toxic gases from the outside. Simultaneously, the combination of multiple connecting rods and annular rings not only provides stable support for the exhalation valve stem but also ensures that the exhalation valve stem maintains a stable movement trajectory when subjected to external forces, thereby improving the reliability and stability of the entire sealing assembly.

[0013] Optionally, the actuating mechanism includes a linkage lever hinged to a lever bracket and a return torsion spring sleeved on the pivot of the linkage lever. The two ends of the return torsion spring are respectively engaged with the lever bracket and the linkage lever. The linkage lever is provided with a limiting mechanism for driving the exhalation valve rod to move. The rotation of the linkage lever drives the exhalation valve plate to disengage from the exhalation port of the chemical oxygen interface seat through the limiting mechanism.

[0014] By adopting the above technical solution, the automatic reset function of the linkage lever is achieved by utilizing the elastic force of the reset torsion spring. Utilizing the lever principle, the linear motion of inserting the chemical oxygen self-rescue device connector is converted into the rotation of the linkage lever. Under the action of the limiting mechanism, the lever moves the exhalation valve away from the exhalation port of the chemical oxygen interface seat, thus enabling the emergency gas supply function of connecting the chemical oxygen self-rescue device to the full-face mask body.

[0015] Optionally, the limiting mechanism includes a sliding groove formed on the linkage lever, a sliding washer coaxially sleeved on the exhalation valve stem, and a retaining ring coaxially sleeved on the exhalation valve stem. The sliding washer is located between the linkage lever and the retaining ring. When the linkage lever rotates, the sliding groove causes the exhalation valve stem to disengage from the exhalation port of the chemical oxygen interface seat.

[0016] By adopting the above technical solution, when the linkage lever rotates under the insertion force of the chemical oxygen self-rescue device connector, the inclined structure of the sliding groove converts the linear motion into an axial thrust on the sliding pad, causing the exhalation valve rod to overcome the return spring force and move away from the exhalation port of the chemical oxygen interface seat. The retaining ring provides preload through elastic deformation, ensuring that the sliding pad always maintains effective contact with the sliding groove. When the chemical oxygen self-rescue device connector is pulled out, the exhalation valve rod automatically returns to its original position under the synergistic action of the return spring and the return torsion spring, and the exhalation valve plate re-seals the exhalation port, restoring the original protective state of the full-face mask body.

[0017] Optionally, the connecting mechanism includes a shell fixed to the full-face mask body, an arc-shaped protrusion fixed to the inner wall of the shell, and a second annular groove on the outer wall of the chemical oxygen self-rescue device connector, wherein the arc-shaped protrusion and the second annular groove form a snap-fit ​​engagement.

[0018] By adopting the above technical solution, the arc-shaped protrusion and the second annular groove on the outer wall of the chemical oxygen self-rescue device connector form a snap-fit, realizing a fast and reliable mechanical connection between the chemical oxygen self-rescue device and the chemical oxygen interface seat.

[0019] Optionally, an interface protective cover is hinged to the housing, and a first annular groove is formed on the outer wall of the interface protective cover, and the arc-shaped protrusion and the first annular groove form a snap-fit ​​engagement.

[0020] By adopting the above technical solution, when the interface protective cover is closed, the arc-shaped protrusion on the shell engages with the first annular groove on the outer wall of the interface protective cover, which can effectively prevent the interface protective cover from being opened accidentally.

[0021] Optionally, a reinforcing block is coaxially fixed on the exhalation valve plate, and the exhalation valve rod passes through the reinforcing block.

[0022] By adopting the above technical solution, during the exhalation process, the exhalation valve plate is subjected to airflow impact force, and the reinforcing block effectively prevents the exhalation valve plate from deforming or being damaged due to excessive force, thus extending the service life of the exhalation valve plate.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Extremely safe switching process: Adopting a progressive structure of "sealing first and then connecting", when the connector of the chemical oxygen self-rescue device is inserted, the interface is first sealed by the sealing ring, and then the exhalation valve is opened by the linkage lever to connect the airway. The internal air chamber of the mask does not come into contact with the external toxic environment throughout the process, thus eliminating the risk of poisoning during the switching process from the structure. 2. Zero-modification structural compatibility: The chemical oxygen interface socket is integrated with the full-face mask body. During normal use, no modification or disassembly of the full-face mask body is required, and the original positive pressure breathing apparatus usage habits and protective performance are fully preserved. In an emergency, only the interface protective cover needs to be opened and the connector of the chemical oxygen self-rescue device needs to be inserted. The operation threshold is extremely low, and both new and experienced operators can quickly master it, solving the pain point of "professional modification required for emergency switching" in existing technologies. 3. Ultra-fast emergency response: The switching operation is simplified to two steps: "open the cover - plug in the connector", with a short total time; the anti-slip design of the interface protective cover and the hinge positioning structure ensure that precise operation can still be performed when wearing protective gloves, buying precious time for escape in high-risk environments; 4. Wide range of scenarios: The normal mode is suitable for all scenarios that require positive pressure breathing apparatus, such as fire fighting, mining, chemical inspection, and tunnel construction; the emergency mode is suitable for emergencies such as gas cylinder depletion and gas supply valve failure. It is especially suitable for extreme environments with obstructed vision, such as dense smoke, darkness, and narrow spaces, covering more than 95% of high-risk respiratory protection scenarios. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram showing that the gas supply valve and chemical oxygen self-rescue device provided in this application embodiment are both installed on the full-face mask; Figure 2 This is a schematic diagram showing the air supply valve provided in this application embodiment installed on a full-face mask with the interface protective cover in the open state; Figure 3 This is a schematic diagram of the actuating mechanism provided in the embodiments of this application; Figure 4This is a partial cross-sectional view of the full-face cover with the interface protective cover provided in this embodiment in the closed state; Figure 5 This is a schematic diagram of the structure of the chemical oxygen interface socket provided in the embodiments of this application; Figure 6 This is a partial structural schematic diagram of the chemical oxygen self-rescue device provided in the embodiments of this application; Figure 7 This is a partial cross-sectional view of a chemical oxygen self-rescue device mounted on a full-face mask, as provided in an embodiment of this application.

[0026] Reference numerals: 1. Full-face mask body; 2. Air supply interface seat; 3. Chemical oxygen interface seat; 4. Connecting mechanism; 5. Lever bracket; 6. Sealing assembly; 7. Actuating mechanism; 8. Exhalation valve rod; 9. Exhalation valve plate; 10. Return spring; 11. Annular protrusion; 12. Base exhalation port sealing rib; 13. Connecting rod; 14. Annular ring; 15. Linkage lever; 16. Return torsion spring; 17. Limiting mechanism; 18. Sliding groove; 19. Sliding pad; 20. Snap ring; 21. Housing; 22. Arc-shaped protrusion; 23. Interface protective cover; 24. First annular groove; 25. Reinforcing block; 26. Air supply valve; 27. Chemical oxygen self-rescue device; 28. Sealing ring; 29. ​​Second annular groove. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 This application will be described in further detail.

[0028] This application discloses a dual-mode interface positive pressure air respirator full face mask.

[0029] Reference Figure 1 and Figure 2 A dual-mode interface positive pressure air respirator full-face mask is disclosed. Its core advantage lies in its dual-mode design—"normal air supply mode" and "emergency chemical oxygen mode"—allowing for seamless switching between different scenarios, balancing conventional protection and emergency preparedness, and significantly improving user safety and adaptability. The full-face mask includes a main body 1 and an air supply interface 2, with the main body 1 and the air supply interface 2 connected to form the first air supply channel. The air supply valve 26 of the positive pressure respirator cylinder assembly is connected to the air supply interface 2. High-pressure air, after being depressurized by a pressure reducer, enters the internal air chamber of the full-face mask through the air supply valve 26.

[0030] Reference Figure 1 and Figure 2The full-face mask also includes a chemical oxygen interface 3, and the full-face mask body 1 is connected to the chemical oxygen interface 3 to form a second gas supply channel. A chemical oxygen self-rescue device 27 is installed in the chemical oxygen interface 3. In an emergency, the chemical oxygen self-rescue device 27 is activated to generate oxygen through a chemical reaction. The oxygen enters the internal air chamber of the full-face mask through the chemical oxygen interface 3 to provide emergency oxygen supply to the wearer.

[0031] Reference Figure 1 , Figure 2 and Figure 3 The chemical oxygen interface 3 is equipped with a lever bracket 5, a sealing component 6, and a toggle mechanism 7. These components work together to achieve dual-mode gas supply and sealing protection. The lever bracket 5 is fixed inside the chemical oxygen interface 3, while the sealing component 6 is responsible for sealing the gas passage between the chemical oxygen self-rescue device 27 and the full-face mask body 1. The toggle mechanism 7 is located inside the chemical oxygen interface 3 and is responsible for driving the sealing component 6 to move, thereby enabling the chemical oxygen self-rescue device 27 to connect with the gas passage between the full-face mask body 1.

[0032] Reference Figure 3 and Figure 4 The sealing assembly 6 includes an exhalation valve stem 8 and an exhalation valve disc 9. The exhalation valve stem 8 passes through the lever bracket 5, and the exhalation valve disc 9 is coaxially fixed to the exhalation valve stem 8. The exhalation valve disc 9 is used to seal the exhalation port of the chemical oxygen interface seat 3. A return spring 10 is provided inside the chemical oxygen interface seat 3, and the two ends of the return spring 10 are fixed to the lever bracket 5 and the exhalation valve disc 9, respectively.

[0033] Reference Figure 3 and Figure 4 A reinforcing block 25 is coaxially fixed to the exhalation valve stem 8, and the reinforcing block 25 is fixed to the exhalation valve plate 9. In this embodiment, the reinforcing block 25 is cylindrical. The reinforcing block 25 is made of high-strength material, which can effectively enhance the connection strength between the exhalation valve stem 8 and the exhalation valve plate 9.

[0034] When the chemical oxygen self-rescue device 27 is not inserted, the return spring 10 always exerts a resistance force on the exhalation valve plate 9, so that the exhalation valve plate 9 tightly covers the exhalation port of the chemical oxygen interface seat 3, effectively preventing external gas from entering the air chamber inside the full-face mask, thus forming a reliable protective barrier for the user.

[0035] Reference Figure 3 and Figure 4 The actuating mechanism 7 includes a linkage lever 15, a return torsion spring 16, and a limiting mechanism 17. The linkage lever 15 is hinged to the lever bracket 5 via a pin, allowing it to rotate freely. The return torsion spring 16 is sleeved on the pivot of the linkage lever 15, with its two ends respectively engaging the lever bracket 5 and the linkage lever 15. The return torsion spring 16 is made of spring steel and possesses excellent torsional elasticity.

[0036] Reference Figure 3and Figure 4 The limiting mechanism 17 includes a sliding groove 18, a sliding washer 19, and a retaining spring 20. The sliding groove 18 is formed on the linkage lever 15. The width of the sliding groove 18 is greater than the diameter of the exhalation valve stem 8, allowing the exhalation valve stem 8 to slide smoothly within the sliding groove 18. The sliding washer 19 is coaxially sleeved on the exhalation valve stem 8. The sliding washer 19 is typically made of wear-resistant plastic to reduce friction with the linkage lever 15. The retaining spring 20 is coaxially sleeved on the exhalation valve stem 8. The retaining spring 20 is used to fix the position of the sliding washer 19 and prevent the sliding washer 19 from disengaging from the exhalation valve stem 8 during movement.

[0037] Reference Figure 5 A fixed annular protrusion 11 is provided at the exhalation port of the chemical oxygen interface seat 3, and a base exhalation port sealing rib 12 is fixed on the annular protrusion 11. The base exhalation port sealing rib 12 is made of rubber or silicone. The annular protrusion 11 and the base exhalation port sealing rib 12 enhance the sealing performance at the exhalation port of the chemical oxygen interface seat 3, effectively preventing the intrusion of external toxic gases.

[0038] Reference Figure 4 and Figure 5 Multiple connecting rods 13 are evenly fixed to the inner wall of the exhalation port of the chemical oxygen interface seat 3. An annular ring 14 is connected to the end of each connecting rod 13. The end of the exhalation valve rod 8 passes through the annular ring 14 and is located inside the full-face mask body 1. By setting multiple connecting rods 13 and annular rings 14, not only is stable support provided for the exhalation valve rod 8, but also guidance is provided for the movement of the exhalation valve rod 8, ensuring that the exhalation valve rod 8 maintains a stable movement trajectory when subjected to external forces.

[0039] Reference Figure 5 and Figure 6 A connecting mechanism 4 is provided on the full-face mask body 1, through which the chemical oxygen self-rescue device 27 is stably connected to the chemical oxygen interface seat 3. The connecting mechanism 4 includes a housing 21 and arc-shaped protrusions 22, with the housing 21 fixed on the full-face mask body 1 and multiple arc-shaped protrusions 22 provided, evenly spaced and fixed on the inner wall of the housing 21.

[0040] Reference Figure 4 and Figure 5 An interface protection cover 23 is hinged to the housing 21. The interface protection cover 23 protects the chemical oxygen interface seat 3, preventing dust and debris from entering. A first annular groove 24 is formed on the outer wall of the interface protection cover 23. An arc-shaped protrusion 22 also forms a snap-fit ​​engagement with the first annular groove 24. When the interface protection cover 23 is closed, the arc-shaped protrusion 22 engages with the first annular groove 24, allowing the interface protection cover 23 to tightly cover the housing 21.

[0041] Reference Figure 5 and Figure 6A second annular groove 29 is provided on the outer wall of the connector of the chemical oxygen self-rescue device 27, and the arc-shaped protrusion 22 can form a snap-fit ​​with the second annular groove 29.

[0042] Reference Figure 6 and Figure 7 A sealing ring 28, shaped like an O, is fitted onto the outer wall of the connector of the chemical oxygen self-rescue device 27. The sealing ring 28 is typically made of rubber, possessing good elasticity and sealing performance. During the insertion of the connector of the chemical oxygen self-rescue device 27 into the chemical oxygen interface seat 3, the sealing ring 28 undergoes elastic deformation due to compression from the inner wall of the chemical oxygen interface seat 3. This allows the sealing ring 28 to seal the interface between the connector 27 and the chemical oxygen interface seat 3, thereby preventing gas leakage.

[0043] Reference Figure 3 , Figure 6 and Figure 7 Align the chemical oxygen self-rescue device 27 connector with the chemical oxygen interface seat 3 and apply axial thrust. During insertion, the connector wall compresses the end of the linkage lever 15, causing the linkage lever 15 to rotate around the pin, while the return torsion spring 16 undergoes torsional deformation. Utilizing the lever principle, the linear motion of the chemical oxygen self-rescue device 27 connector is converted into the rotation of the linkage lever 15.

[0044] Reference Figure 3 , Figure 6 and Figure 7 When the linkage lever 15 rotates, the sliding groove 18 causes the exhalation valve rod 8 to disengage from the exhalation port of the chemical oxygen interface seat 3. Specifically, when the linkage lever 15 rotates, the sliding groove 18 interacts with the sliding pad 19, converting the rotational motion of the linkage lever 15 into the linear motion of the exhalation valve rod 8, thereby causing the exhalation valve plate 9 to disengage from the exhalation port and opening the gas supply channel of the chemical oxygen self-rescue device 27.

[0045] After the air supply channels of the full-face mask and the chemical oxygen self-rescue device 27 are opened, the chemical oxygen self-rescue device 27 enters the standby state. Furthermore, during the entire process of installing the chemical oxygen self-rescue device 27 into the chemical oxygen interface 3, external gases will not enter the full-face mask, ensuring the user's safety during installation. The wearer's exhaled air (rich in carbon dioxide and water vapor) enters the chemical oxygen self-rescue device 27, reacts with its internal substances, and continuously produces oxygen. The produced oxygen enters the full-face mask through the exhalation port of the chemical oxygen interface 3, providing the user with necessary respiratory support.

[0046] The user grips the chemical oxygen self-rescue device 27 and pulls it outward forcefully, causing its connector to detach from the chemical oxygen interface seat 3. The reset action of the reset torsion spring 16 causes the linkage lever 15 to rotate in a reset manner, and under the action of the limiting mechanism 17 and the reset action of the reset spring 10, it jointly drives the exhalation valve 9 towards the exhalation port of the chemical oxygen interface seat 3, ultimately causing the exhalation valve 9 to re-close the exhalation port of the chemical oxygen interface seat 3, cutting off the connection between the connector of the chemical oxygen self-rescue device 27 and the internal air chamber of the full-face mask body 1.

[0047] The full-face mask has three working modes: normal air supply mode, emergency chemical oxygen switching mode, and reset mode.

[0048] In normal gas supply mode, the chemical oxygen interface assembly is in the closed state: the interface protective cover 23 is fastened to the housing 21, and the torque of the reset torsion spring 16 causes the long end of the linkage lever 15 to adhere to the lever bracket 5. Under the pressure of the reset spring 10, the exhalation valve 9 is tightly fitted to the base exhalation port sealing rib 12, preventing external gas from entering the full-face mask from the exhalation port of the chemical oxygen interface seat 3.

[0049] The air supply valve 26 of the positive pressure respirator cylinder assembly is connected to the air supply interface seat 2. After the high-pressure air is reduced in pressure by the pressure reducer, it enters the air chamber inside the mask through the air supply valve 26. During this process, the chemical oxygen interface assembly does not participate in the operation and does not affect the original protective performance of the full-face mask.

[0050] When the gas cylinder is depleted, quickly activate the emergency chemical oxygen switching mode. The entire process requires only three steps, without disassembling any parts, and is relatively quick. Step 1: Open the protective cover: Pinch the quick-release point of the interface protective cover 23 and pull it outwards to expose the chemical oxygen interface seat 3. Step 2: Insert the chemical oxygen self-rescue device 27 into the chemical oxygen interface seat 3: Align the connector of the chemical oxygen self-rescue device 27 with the chemical oxygen interface seat 3 and apply axial thrust. The insertion stroke should be ≤3mm. The O-ring 28 on the outer wall of the connector of the chemical oxygen self-rescue device 27 is compressed by the inner wall of the chemical oxygen interface seat 3, causing elastic deformation of the sealing ring 28 and achieving a complete seal between the interface and the outside. At this time, the gas chamber inside the full-face mask remains isolated from the outside and the chemical oxygen self-rescue device 27. Step 3: Gas circuit... Connect: Continue applying force to insert the connector of the chemical oxygen self-rescue device 27 to a stroke of 3-8mm. The end face of the connector of the chemical oxygen self-rescue device 27 contacts the force-bearing end of the linkage lever 15, pushing the linkage lever 15 to rotate counterclockwise by 20° around the rotation axis. The linkage end of the linkage lever 15 tilts upward, driving the exhalation valve rod 8 to rise through the sliding groove 18 and the sliding pad 19, opening the exhalation valve plate 9, so that the exhalation valve plate 9 and the base body exhalation port sealing rib 12 form a 5mm gap. The air chamber inside the full-face mask is fully connected to the interface of the chemical oxygen self-rescue device 27, and the oxygen generated by the chemical oxygen self-rescue device 27 enters the full-face mask for the wearer to breathe. In addition, switch the O-ring 28 throughout the entire process to maintain a compressed state to ensure effective sealing and prevent the intrusion of toxic gases.

[0051] Once the hazardous environment is removed or the gas supply from the cylinder is restored, the system enters reset mode. Reset is achieved by forcefully pulling out the connector of the chemical oxygen self-rescue device 27: After the connector of the chemical oxygen self-rescue device 27 is removed, the linkage lever 15 rotates under the torque of the reset torsion spring 16, causing the linkage lever 15 to re-press the lever support 5. The exhalation valve 9 closes under the action of the reset spring 10, restoring the full-face mask to a sealed state in normal gas supply mode, allowing for reconnection of the positive pressure respirator supply valve 26 for use.

[0052] The implementation principle of a dual-mode interface positive pressure air respirator full-face mask in this application embodiment is as follows: Under normal conditions, the gas cylinder assembly supplies gas through the gas supply interface 2, and the exhalation valve 9 seals the exhalation port of the chemical oxygen interface 3 to prevent the entry of toxic gases. When the gas cylinder is depleted, the protective cover is opened, and the chemical oxygen self-rescue device 27 connector is inserted into the chemical oxygen interface 3, driving the linkage lever 15 to open the chemical oxygen supply channel. During the switching process, the air chamber inside the mask remains isolated from the outside environment, preventing the wearer from inhaling toxic gases. At the same time, the connecting mechanism 4 achieves a stable connection between the chemical oxygen self-rescue device 27 connector and the full-face mask through a snap-fit ​​engagement. The coordinated operation of all components ensures the convenience, sealing, and safety of dual-mode switching, representing a significant improvement and enhancement compared to existing technologies.

[0053] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-mode interface positive pressure air respirator full face mask, characterized in that: The device includes a full-face mask body (1) and an air supply interface seat (2) connected to the full-face mask body (1). The full-face mask body (1) is also connected to a chemical oxygen interface seat (3). The full-face mask body (1) is provided with a connecting mechanism (4) for connecting a chemical oxygen self-rescue device (27). A lever bracket (5) is fixed inside the chemical oxygen interface seat (3). A sealing component (6) for sealing the exhalation port of the chemical oxygen interface seat (3) is provided on the lever bracket (5). A toggle mechanism (7) for driving the sealing component (6) to move is provided inside the chemical oxygen interface seat (3). The sealing assembly (6) includes an exhalation valve rod (8) passing through the lever bracket (5) and an exhalation valve plate (9) coaxially fixed on the exhalation valve rod (8). A return spring (10) is provided inside the chemical oxygen interface seat (3). The two ends of the return spring (10) are respectively fixed on the lever bracket (5) and the exhalation valve plate (9). The exhalation valve plate (9) is used to seal the exhalation port of the chemical oxygen interface seat (3). The actuation mechanism (7) includes a linkage lever (15) hinged on the lever bracket (5) and a reset torsion spring (16) sleeved on the rotating shaft of the linkage lever (15). The two ends of the reset torsion spring (16) are respectively engaged on the lever bracket (5) and the linkage lever (15). The linkage lever (15) is provided with a limiting mechanism (17) for driving the exhalation valve rod (8) to move. The rotation of the linkage lever (15) drives the exhalation valve plate (9) to disengage from the exhalation port of the chemical oxygen interface seat (3) through the limiting mechanism (17). The limiting mechanism (17) includes a sliding groove (18) opened on the linkage lever (15), a sliding washer (19) coaxially sleeved on the exhalation valve rod (8), and a retaining ring (20) coaxially sleeved on the exhalation valve rod (8). The sliding washer (19) is located between the linkage lever (15) and the retaining ring (20). When the linkage lever (15) rotates, the exhalation valve rod (8) is driven to disengage from the exhalation port of the chemical oxygen interface seat (3) under the action of the sliding groove (18). The chemical oxygen interface seat (3) is used for the insertion of the chemical oxygen self-rescue device (27) connector with a sealing ring (28) on the outer wall. When the chemical oxygen self-rescue device (27) connector is inserted into the chemical oxygen interface seat (3), the sealing ring (28) and the inner wall of the chemical oxygen interface seat (3) are squeezed together to seal the interface between the chemical oxygen self-rescue device (27) and the chemical oxygen interface seat (3) to prevent gas leakage. After the chemical oxygen self-rescue device (27) connector is inserted further, the linkage lever (15) is squeezed to rotate. The linkage lever (15) drives the exhalation valve rod (8) to move through the sliding groove (18) and the sliding pad (19), so that the exhalation valve plate (9) is disengaged from the exhalation port of the chemical oxygen interface seat (3), thereby opening the gas supply channel of the chemical oxygen self-rescue device (27).

2. The dual-mode interface positive pressure air respirator full face mask according to claim 1, characterized in that: An annular protrusion (11) is fixed at the exhalation port of the chemical oxygen interface seat (3). A base exhalation port sealing rib (12) is fixed on the annular protrusion (11). Multiple connecting rods (13) are evenly fixed on the inner wall of the exhalation port of the chemical oxygen interface seat (3). An annular ring (14) is fixed at the end of the multiple connecting rods (13). The end of the exhalation valve rod (8) passes through the annular ring (14) and is located inside the full-face mask body (1).

3. A dual-mode interface positive pressure air respirator full face mask according to claim 1, characterized in that: The connecting mechanism (4) includes a housing (21) fixed on the full-face mask body (1) and an arc-shaped protrusion (22) fixed on the inner wall of the housing (21). A second annular groove (29) is provided on the outer wall of the chemical oxygen self-rescue device (27) connector, and the arc-shaped protrusion (22) and the second annular groove (29) form a snap-fit ​​engagement.

4. A dual-mode interface positive pressure air respirator full face mask according to claim 3, characterized in that: An interface protection cover (23) is hinged to the housing (21). A first annular groove (24) is provided on the outer wall of the interface protection cover (23). The arc-shaped protrusion (22) and the first annular groove (24) are engaged.

5. A dual-mode interface positive pressure air respirator full face mask according to claim 1, characterized in that: A reinforcing block (25) is coaxially fixed on the exhalation valve plate (9), and the exhalation valve rod (8) passes through the reinforcing block (25).

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