Positive pressure protective mask

Abstract

The utility model discloses a positive pressure type protective mask, it includes the eye protection chamber and piston type respirator of mask shell and arrangement on mask shell, piston type respirator includes cylinder and the piston of installation in cylinder, and the inner chamber of cylinder is divided into non -inflatable cavity and inflatable cavity by piston, and the upper portion fixed mounting of cylinder is fixed tooth board and horizontal fixed axle, and the lower movable tooth board is rotatably installed on horizontal fixed axle, and one end of lower movable tooth board extends into non -inflatable cavity and is connected with the top of piston, and the other end is correspondingly arranged with upper fixed tooth board, inflatable cavity is provided with T shape gas supply pipe, double -pipe joint and cylinder exhaust pipe, and piston is provided with piston air inlet and piston exhaust hole, and piston is moved upward, and piston air inlet is communicated with T shape gas supply pipe, and piston exhaust hole is not communicated with cylinder exhaust pipe, and piston is moved downward, and piston exhaust hole is communicated with cylinder exhaust pipe, and piston air inlet is not communicated with T shape gas supply pipe, and double -pipe joint is connected to provide fresh air breathing tube for nasal cavity.

Description

Technical Field

[0001] This utility model relates to respiratory protective equipment, specifically to a positive pressure protective mask. Background Technology

[0002] The existing positive pressure protective masks are actually positive pressure differential protective masks, which are more reliable and more comfortable to use than filter-type protective masks.

[0003] Existing positive pressure differential protective masks include components such as a full-face mask, a high-pressure air tank, and a breathing valve assembly. The full-face mask is connected to the high-pressure air tank via a depressurization device, creating a "positive pressure environment" inside the mask that is higher than the outside pressure, preventing toxic and harmful gases from entering the nostrils and eyes. The main body of the mask conforms to the contours of the face and is secured with an elastic headband to ensure a tight seal against the face, preventing the infiltration of toxic and harmful gases from the outside. At the same time, the front of the mask is designed with a viewing window made of a high-strength transparent material (such as polycarbonate) to provide a certain field of vision, but when in use, exhaled moisture can easily adhere to the inside of the viewing window, causing blurred vision.

[0004] The breathing valve assembly includes an exhalation valve and an inhalation valve. The exhalation valve is a one-way valve located below or to the side of the mask. It opens when the user exhales, venting exhaled air to the outside, and automatically closes after exhalation to prevent outside air from flowing back into the full mask. The inhalation valve connects to a pressure reducing valve and a high-pressure air canister via a supply hose. It opens automatically when the user inhales, allowing depressurized air from the canister to flow into the full mask, and automatically closes after inhalation. The exhalation and inhalation valves rely on changes in air pressure within the mask to control their automatic opening and closing, which presents a reliability issue. Furthermore, it requires the user to inhale and exhale forcefully to open the valve assembly, leading to fatigue after prolonged use. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a positive pressure protective mask that can autonomously control breathing, addressing the shortcomings of existing positive pressure differential protective masks.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A positive pressure protective mask includes a mask shell and an eye protection chamber disposed on the upper part of the mask shell, characterized in that: The lower part of the mask shell is equipped with a piston-type respirator. The piston-type respirator includes a cylinder and a piston installed in the cylinder. The inner cavity of the cylinder is divided into a non-inflated chamber and an inflated chamber by the piston. An upper fixed toothed plate and a horizontal fixed shaft are fixedly installed on the upper part of the cylinder. A lower movable toothed plate is rotatably installed on the horizontal fixed shaft. One end of the lower movable toothed plate extends into the non-inflated chamber and is connected to the top of the piston. The other end is correspondingly set with the upper fixed toothed plate. The inflation chamber is equipped with a T-shaped air supply pipe, a double-pipe connector and a cylinder exhaust pipe. The piston is provided with a piston air inlet and a piston exhaust port. The double-pipe connector is connected to a breathing tube that provides fresh air to the nasal cavity. During inhalation, the lower movable toothed plate moves away from the upper fixed toothed plate, the piston moves upward, the piston air inlet is connected to the T-shaped air supply pipe, and the piston exhaust port is not connected to the cylinder exhaust pipe. Fresh air enters the nasal cavity through the T-shaped air supply pipe, the piston air inlet, the inflation chamber, the double pipe connector, and the breathing tube. During exhalation, the lower movable toothed plate approaches the upper fixed toothed plate and drives the piston to move downward. The piston air inlet is not connected to the T-shaped air supply pipe, and the piston exhaust port is connected to the cylinder exhaust pipe. The user's exhaled air flows sequentially through the breathing tube, the double pipe connector, the inflation chamber, and the cylinder exhaust pipe before being discharged.

[0007] In use, the user holds both the upper fixed toothed plate and the lower movable toothed plate outside the cylinder in their mouth. When the user bites down on the upper fixed toothed plate and the lower movable toothed plate, causing the lower movable toothed plate to fit against the upper fixed toothed plate, the piston moves downward. The piston exhaust port connects to the cylinder exhaust pipe, and carbon dioxide gas in the breathing tube flows sequentially through the double-pipe connector at the bottom of the cylinder into the piston exhaust port, the cylinder exhaust pipe, and the mask exhaust pipe, thus being discharged into the air. When the user releases their teeth, the lower movable toothed plate rotates counterclockwise along the horizontal fixed axis, forming a certain angle with the upper fixed toothed plate, causing the piston to move upward. When the piston moves upward, on the one hand, the piston exhaust port is no longer connected to the cylinder exhaust pipe; on the other hand, the piston air inlet connects to the T-shaped air supply pipe on the cylinder, allowing fresh air to flow into the piston air inlet through the T-shaped air supply pipe, reach the lower part of the cylinder's inflation chamber, and then flow into the cylinder's double-pipe connector and the breathing tube. The two breathing tubes are inserted into the user's two nostrils, allowing the user to breathe fresh air. In this way, by actively controlling the piston's up and down movement, the user can control exhalation and inhalation. This not only eliminates the need for exhalation and inhalation valves installed in existing positive pressure protective masks, resulting in a compact structure, but also avoids relying on pressure changes to control exhalation and inhalation, improving the breathing reliability of the protective mask during use. It is also easy to use and does not cause fatigue even after prolonged use.

[0008] In one specific embodiment, the eye protection chamber includes an eye-sealing soft ring, a nose bridge pad, a transparent window panel, and a positive pressure air supply pipe. The eye-sealing soft ring and the nose bridge pad are connected to form a sealing ring for sealing the eyes. The transparent window panel is installed at the front of the sealing ring. One end of the positive pressure air supply pipe extends into the eye protection chamber, and the other end is connected to the T-shaped air supply pipe. This not only provides an independent sealed space for the eyes but also maintains positive pressure in the eyes, ensuring that toxic and harmful gases from the outside do not enter the eye protection chamber, thus achieving the purpose of protecting the eyes.

[0009] In one specific embodiment, the piston is a bottle cap type piston.

[0010] In one specific embodiment, the inlet of the T-shaped gas supply pipe is sequentially connected to an annular gas supply pipe and a main gas supply pipe for connecting to a high-pressure gas source.

[0011] In one specific embodiment, a mask exhaust pipe is provided on the mask shell, and the cylinder exhaust pipe is connected to the mask exhaust pipe.

[0012] In one specific embodiment, a nose-shaped shield is provided at the outlet of the mask exhaust pipe to prevent the mask exhaust pipe from being blocked.

[0013] In one specific embodiment, a mouthguard is installed on the outer periphery of the upper fixed toothed plate and the lower movable toothed plate to seal the lips and prevent toxic and harmful gases from entering the oral cavity during user oral activities.

[0014] In one specific embodiment, the nozzle guard, upper fixed toothed plate, T-shaped air supply pipe, cylinder exhaust pipe, and double pipe connector are die-cast together with the cylinder as a whole.

[0015] In one specific embodiment, protective panels are respectively installed on both sides of the mask shell, and a fixed elastic band is installed between the two protective panels to provide protection for the user's face and facilitate the wearing of the protective mask.

[0016] In one specific embodiment, a spring is installed between the piston and the base plate of the cylinder to facilitate rapid piston reset.

[0017] In one specific embodiment, a vertical plane is provided on one side of the inner cavity of the cylinder, and the shape of the piston is consistent with the cross-section of the inner cavity of the cylinder, so as to avoid rotation when the piston moves up and down.

[0018] Compared with the prior art, the beneficial effects of this utility model are: 1) This utility model not only allows the user to actively control their breathing through their mouth, ensuring that the user's breathing is autonomous and controllable, but also maintains positive pressure around the eyes, ensuring that toxic and harmful gases from the outside will not enter the eye protection chamber, thus achieving the purpose of protecting the eyes.

[0019] 2) This utility model is particularly suitable for use in emergency rescue and medical protection in air-polluted places where it is necessary to isolate toxic and harmful gases. It is especially suitable for personal use by armed police chemical defense soldiers, firefighters, medical personnel, etc., to ensure their own respiratory safety. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view structural diagram of an embodiment of the present utility model.

[0022] Figure 2 This is a right-side structural view of an embodiment of the present invention.

[0023] Figure 3 This is a bottom view of an embodiment of the present invention.

[0024] Figure 4 for Figure 1 A-A sectional view.

[0025] Figure 5 This is a front view of a piston-type respirator.

[0026] Figure 6 This is a left-side structural view of a piston-type respirator.

[0027] Figure 7 This is a bottom view of the structure of a piston-type respirator.

[0028] Figure 8 for Figure 5 B-B sectional view.

[0029] In the diagram: 1. Eye sealing ring; 2. Transparent window plate; 3. Nose bridge pad; 4. Protective panel; 5. Breathing tube; 6. Mouth guard; 7. Upper fixed toothed plate; 8. Lower movable toothed plate; 9. Lower fixing bolt; 10. Fixed elastic band; 11. Horizontal fixing bolt; 12. Mask shell; 13. Positive pressure air supply pipe; 14. Circular air supply pipe; 15. Cylinder; 16. Lower fixed plate; 17. Mask exhaust pipe; 18. Cylinder exhaust pipe; 19. Nose-shaped shield; 20. T-shaped air supply pipe; 21. Piston; 22. Piston inlet; 23. Piston exhaust port; 24. Top cover; 25. Horizontal fixed shaft; 26. Spring; 27. Main air supply pipe; 28. Main breathing port; 29. ​​Dual-pipe connector. Detailed Implementation

[0030] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct mating or plugging connection, or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Please see Figures 1-8 The main structure of one embodiment of the positive pressure piston-type protective mask of this utility model includes a mask shell 12, an eye protection chamber arranged on the upper part of the mask shell 12, and a piston-type respirator installed on the lower part of the mask shell 12.

[0034] Protective panels 4 are arranged on both sides of the mask shell 12, and a fixed elastic band 10 is installed between the two protective panels 4. A nose-shaped shield 19 is installed on the front of the shell 12.

[0035] The eye protection chamber is an independent, sealed space equipped with a transparent window panel 2, a positive pressure air supply pipe 13, an eye-sealing soft ring 1, and a nose bridge pad 3. The eye-sealing soft ring 1 and the nose bridge pad 3 are connected to form a sealing ring for sealing the eyes. The transparent window panel 2 is installed at the front of the sealing ring. One end of the positive pressure air supply pipe 13 extends into the eye protection chamber, and the other end is connected to a T-shaped air supply pipe. In use, the protective mask is placed on the user's head by fixing the elastic band 10, and the eye-sealing soft ring 1 and nose bridge pad 3 seal tightly against the eyes of the face, ensuring that toxic and harmful gases from the outside cannot enter the eye protection chamber, thus protecting the eyes. At the same time, the positive pressure air supply pipe 13 provides fresh air to the eye protection chamber, ensuring eye comfort. In addition, since the eye protection chamber of this invention is an independent, sealed space, it can prevent the user's exhaled air from blurring the transparent window panel 2.

[0036] The piston-type respirator assembly includes a cylinder 15 mounted on the lower part of the mask housing 12, and a cap-type piston 21 and a top cover 24 mounted inside the cylinder 15. The top cover 24 is mounted on the top of the cylinder 15. The piston 21 divides the inner cavity of the cylinder 15 into a non-inflated chamber and an inflated chamber. An upper fixed toothed plate 7 and a horizontal fixed shaft 25 are fixedly mounted on the upper part of the cylinder 15. A lower movable toothed plate 8 is rotatably mounted on the horizontal fixed shaft 25. One end of the lower movable toothed plate 8 extends into the non-inflated chamber and connects (tangentially) to the top of the piston 21, while the other end corresponds to the upper fixed toothed plate 7. A T-shaped air supply pipe 20, a double-pipe connector 29, and a cylinder exhaust pipe 18 are provided on the inflated chamber of the cylinder 15. The double-pipe connector 29 connects to a breathing tube 5 that provides fresh air to the nasal cavity. To prevent toxic and harmful gases from entering the user's mouth, a mouthguard 6 is installed around the outer periphery of the upper fixed toothed plate 7 and the lower movable toothed plate 8.

[0037] The piston 21 is provided with a piston inlet 22 and a piston exhaust 23. The mask housing 12 is provided with a mask exhaust pipe 17. Moving the piston upward allows the piston inlet to communicate with the T-shaped air supply pipe; moving the piston downward allows the piston exhaust 23 to communicate with the cylinder exhaust pipe. The inlet of the T-shaped air supply pipe 20 of the cylinder 15 is connected to the main air supply pipe 27 via an annular air supply pipe 14. The main air supply pipe 27 is used to connect to a high-pressure air source.

[0038] The cylinder exhaust pipe 18 is connected to the mask exhaust pipe 17. To prevent the outlet of the mask exhaust pipe 17 from being blocked, a nose-shaped shield 19 is provided at the outlet of the mask exhaust pipe 17.

[0039] The piston-type respirator assembly is connected to the cylinder 15 via the lower fixing plate 16 behind the mask housing 12 using the lower fixing bolt 9. At the same time, the cylinder exhaust pipe 18 is connected (plugged in) to the mask exhaust pipe 17 fixedly installed behind the mask housing 12.

[0040] To facilitate piston 21 reset, a spring 26 is installed between piston 21 and the base plate of cylinder 15.

[0041] To prevent the piston 21 from rotating during its up-and-down movement, a vertical plane is provided on one side of the inner cavity of the cylinder 15, and the shape of the piston 21 is consistent with the cross-section of the inner cavity of the cylinder 15.

[0042] In use, this invention uses a fixed elastic band 10 to securely fasten the protective mask to the user's head, ensuring that eye protection and nasal breathing protection are separate: the eye protection chamber is an independent, sealed space, preventing toxic or harmful gases from entering and thus protecting the eyes; since the eye protection chamber is not connected to the piston-type respirator assembly, two positive pressure air supply pipes 13 provide fresh air to the eye protection chamber. The air pressure inside the eye protection chamber is slightly higher than atmospheric pressure to prevent toxic or harmful gases from entering. When the air pressure inside the eye protection chamber is too high, the air inside automatically flows out through the gap between the eye-sealing soft ring 1 and the face, ensuring user eye comfort.

[0043] The cylinder 15, mouthpiece plate 6, upper fixed toothed plate 7, T-shaped air supply pipe 20, cylinder exhaust pipe 18, and double pipe connector 29 are die-cast into a single unit. The cylinder 15 is test tube shaped, with one outer side made into a flat plate to facilitate the installation of the lower movable toothed plate 8 and horizontal fixed shaft 25; the inner side in the same direction is also made into a flat plate to match the shape of the piston 21, preventing the piston 21 from rotating during its up-and-down movement. A bottle cap-type piston 21 is installed inside the cylinder 15, and a spring 26 is installed inside the piston 21. A top cover 24 is installed in the upper outlet of the cylinder 15. A screw hole is opened at the bottom of the cylinder 15. The T-shaped air supply pipe 20 on the cylinder 15 connects to the annular air supply pipe 14, and the double pipe connector 29 on the cylinder 15 connects to two breathing tubes 5 respectively. The vertical screw hole at the bottom of the cylinder 15 is connected to the lower fixing plate 16 of the mask with a lower fixing bolt 9, ensuring that the piston-type respirator is firmly fixed inside the mask.

[0044] The annular air supply tube 14 is looped around the user's neck. The user carries a high-pressure air tank, which is connected to the main air supply tube 27 on the annular air supply tube 14 via a pressure reducing valve, an air supply valve, and a connecting hose.

[0045] The user carries a high-pressure air tank. High-pressure clean air is depressurized by a pressure reducing valve and the air supply valve adjusts the flow rate (this is not the equipment protected by this utility model). It is then delivered to the main air supply pipe 27 through a hose, and then flows into the annular air supply pipe 14 and the T-shaped air supply pipe 20. Then, part of the air flows into the eye protection chamber through the positive pressure air supply pipe 13 to protect the user's eyes; the other part of the air flows into the cylinder 15.

[0046] User's inhalation process: If the user releases their teeth, the lower movable tooth plate 8 and the upper fixed tooth plate 7 form a certain angle. The lower movable tooth plate 8 does not obstruct the upward movement of the piston 21. The piston 21 moves upward under the action of the internal spring 26. The piston air inlet 22 is connected to the T-shaped air supply pipe 20 and the annular air supply pipe 14. Fresh air flows into the piston air inlet 22 through the main air supply pipe 27, the annular air supply pipe 14, and the T-shaped air supply pipe 20, and then flows into the breathing tube 5 through the double pipe connector 29, and finally enters the nasal cavity. The user can then inhale naturally. At the same time, the piston exhaust port 23 is not connected to the cylinder exhaust pipe 18, that is, fresh air will not flow out through the cylinder exhaust pipe 18, and toxic and harmful gases from the outside will not enter the piston respirator.

[0047] User's exhalation process: Gently bite down on the upper fixed toothed plate 7 and the lower movable toothed plate 8. The lower movable toothed plate 8 rotates around the horizontal fixed shaft 25, pushing the piston 21 downward. At the same time, the spring 26 inside the piston 21 is compressed. After the piston 21 moves downward, the piston inlet 22 is no longer connected to the T-shaped air supply pipe 20 on the cylinder 15, and the piston exhaust port 23 is connected to the cylinder exhaust pipe 18. The carbon dioxide gas in the breathing tube 5 can flow into the piston 21 through the double pipe joint 29 at the bottom of the cylinder 15, and then flow into the piston exhaust port 23, the cylinder exhaust pipe 18, and the mask exhaust pipe 17 in sequence, thus flowing into the air, and the user can exhale.

[0048] When using this invention, the up-and-down movement of the teeth is synchronized with the breathing movement: to exhale carbon dioxide, the teeth need to clench the upper fixed tooth plate 7 and the lower movable tooth plate 8; releasing the teeth allows for the inhalation of fresh air. With this invention, there is no need to worry about unreliable inhalation or exhalation valves, and the user will not experience fatigue or chest tightness during use, nor will they worry about the transparent window being blurry.

[0049] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model should fall within the protection scope of the technical solution of this utility model.

Claims

1. A positive pressure protective mask, comprising a mask shell (12) and an eye protection chamber disposed on the upper part of the mask shell, characterized in that: The lower part of the mask shell is equipped with a piston-type respirator, which includes a cylinder (15) and a piston (21) installed in the cylinder. The cylinder cavity is divided into a non-inflated cavity and an inflated cavity by the piston. An upper fixed toothed plate (7) and a horizontal fixed shaft (25) are fixedly installed on the upper part of the cylinder. A lower movable toothed plate (8) is rotatably installed on the horizontal fixed shaft. One end of the lower movable toothed plate (8) extends into the non-inflated cavity and is connected to the top of the piston. The other end is correspondingly set with the upper fixed toothed plate. The inflation chamber is equipped with a T-shaped air supply pipe (20), a double pipe connector (29) and a cylinder exhaust pipe (18). The piston is provided with a piston air inlet (22) and a piston exhaust port (23). The double pipe connector (29) is connected to a breathing tube (5) that provides fresh air to the nasal cavity. During inhalation, the lower movable toothed plate (8) moves away from the upper fixed toothed plate (7), the piston moves upward, the piston air inlet (22) is connected to the T-shaped air supply pipe (20), the piston exhaust port (23) is not connected to the cylinder exhaust pipe (18), and fresh air enters the nasal cavity through the T-shaped air supply pipe (20), the piston air inlet, the inflation chamber, the double pipe connector (29), and the breathing tube (5); When exhaling, the lower movable toothed plate (8) approaches the upper fixed toothed plate (7) and drives the piston to move downward. The piston air inlet (22) is not connected to the T-shaped air supply pipe, and the piston exhaust port (23) is connected to the cylinder exhaust pipe (18). The user's exhaled air flows sequentially through the breathing tube (5), the inflation chamber, the piston exhaust port (23), the cylinder exhaust pipe (18), and the mask exhaust pipe (17) before being discharged.

2. The positive pressure protective mask according to claim 1, characterized in that, The eye protection chamber includes an eye sealing soft ring (1), a nose bridge pad (3), a transparent window plate (2), and a positive pressure air supply pipe (13). The eye sealing soft ring (1) and the nose bridge pad (3) are connected to form a sealing ring for sealing the eyes. The transparent window plate (2) is installed at the front of the sealing ring. One end of the positive pressure air supply pipe (13) extends into the eye protection chamber, and the other end is connected to the T-shaped air supply pipe (20).

3. The positive pressure protective mask according to claim 1, characterized in that, The piston is a bottle cap type piston (21).

4. The positive pressure protective mask according to claim 3, characterized in that, The inlet of the T-shaped gas supply pipe (20) is connected in sequence to the annular gas supply pipe (14) and the main gas supply pipe (27) for connection with the high-pressure gas source.

5. The positive pressure protective mask according to claim 3, characterized in that, The mask shell is provided with a mask exhaust pipe (17), and the cylinder exhaust pipe (18) is connected to the mask exhaust pipe (17).

6. The positive pressure protective mask according to claim 4, characterized in that, A nose-shaped shield (19) is provided at the outlet of the mask exhaust pipe (17).

7. The positive pressure protective mask according to any one of claims 1-6, characterized in that, The outer periphery of the upper fixed toothed plate (7) and the lower movable toothed plate (8) is fitted with a nozzle guard (6).

8. The positive pressure protective mask according to any one of claims 1-6, characterized in that, Protective panels (4) are installed on both sides of the mask shell, and a fixing elastic band (10) is installed between the two protective panels.

9. The positive pressure protective mask according to any one of claims 1-6, characterized in that, A spring (26) is installed between the piston (21) and the base plate of the cylinder (15).

10. The positive pressure protective mask according to any one of claims 1-6, characterized in that, A vertical plane is provided on one side of the inner cavity of the cylinder, and the shape of the piston is consistent with the cross-section of the inner cavity of the cylinder.

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