Airtight positive pressure protective helmet

Abstract

The utility model provides an airtight type positive pressure protective helmet which comprises a shell, a helmet lower apron is fixedly installed at the bottom of the shell, an opening and closing knob is installed on the shell, a face window opening and closing piece is fixed to the opening and closing knob, a transparent face window is fixedly installed on the face window opening and closing piece, and the transparent face window is fixedly installed on the transparent face window. A transparent face window is installed in the shell, a special-shaped sealing rubber ring is installed between the transparent face window and the shell, an automatic exhaust pressure relief valve is fixedly installed in one side of the shell, a lock catch button is installed on the other side of the shell, and the lock catch button is matched with the transparent face window. According to the airtight type positive pressure protective helmet, the two automatic exhaust pressure relief valves with the opening pressure capable of being adjusted are used, the stability and reliability of the internal pressure of the helmet are guaranteed, air is made to flow in one direction, the exhaust valves are opened only when the internal pressure of the helmet reaches a set value, and when no pressure is supplied to the interior of the helmet or the supplied pressure is insufficient, the exhaust valves are closed. And the exhaust valve is in a closed state, so that external toxic and harmful gas is well prevented from invading.

Description

Technical Field

[0001] The utility model relates to the field of helmet equipment, in particular to an airtight positive pressure protective helmet. Background Art

[0002] When treating patients with infectious diseases, medical staff need to wear positive pressure protective helmets. Due to the long wearing time, the human body exhales a large amount of humid gas, which will produce water mist on the inside of the face shield. In order to ensure that the water mist is removed without taking off the protective helmet, the medical staff's vision is guaranteed to be clear.

[0003] According to the existing patent document with publication number CN114847579A, a positive pressure protective helmet with a face screen defogger function is disclosed, which includes a helmet body, an air inlet pipe, a worm, a worm gear, a concave platform, a connecting piece, a face screen, a groove, an elastic apron, an arc-shaped groove, an L-shaped telescopic rod, a knob, a baffle, and a support piece. The helmet body is provided with an air inlet pipe, the elastic apron fits the human face, the knob is bonded to the worm, the support piece and the baffle are a whole, and the baffle and the helmet body are a whole. When this technical solution is in use, the L-shaped telescopic rod structure adopted can be applied to different arc-shaped protective helmets, and it is universal. The worm gear structure has self-locking properties, which makes the overall structure more stable. With respect to the above technical solution, although this solution achieves the stability of the helmet, it cannot cool down and reduce noise inside the helmet during use. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an airtight positive pressure protective helmet to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. When in use, an arc-shaped cavity is opened between the helmet shell and the buffer cover. The noise reduction sponge inside the arc-shaped cavity absorbs and reduces the noise, preventing external noise from affecting the user inside the helmet. At the same time, the air entering the arc-shaped cavity cools the top of the head to ensure the comfort of the user.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: an airtight positive pressure protective helmet, comprising a shell, a helmet lower apron fixedly installed on the bottom of the shell, an opening and closing knob installed on the shell, a face window opening and closing piece fixed on the opening and closing knob, a transparent face window fixedly installed on the face window opening and closing piece, an anisotropic sealing rubber ring installed between the transparent face window and the shell, an automatic exhaust and pressure relief valve fixedly installed inside one side of the shell, a face window opening and closing lock installed on the other side of the shell, and the face window opening and closing lock cooperates with the transparent face window.

[0006] Furthermore, the automatic exhaust and pressure relief valve includes a valve body, a sealing ring is installed on the valve body, a valve core is movably installed inside the valve body, a valve sleeve is movably installed on the valve core, and a spring mechanism is installed between the valve sleeve and the valve core.

[0007] Furthermore, a hole is opened on the valve sleeve, the valve sleeve is installed on the valve core through threads, an O-ring is installed between the valve body and the shell, and a special-shaped groove is opened on the shell.

[0008] Furthermore, the opening and closing knob includes an opening and closing knob snap ring, a spring pressure regulating member is movably installed inside the opening and closing knob snap ring, and a compression spring is installed on the spring pressure regulating member.

[0009] Furthermore, a ball is installed at one end of the compression spring, and the ball is in movably contact with the special-shaped groove.

[0010] Furthermore, the face window opening and closing member includes an opening and closing pin and a cylindrical boss, and the face window opening and closing lock includes a lock button, and a lock pin is movably installed inside the lock button, and the lock pin cooperates with the cylindrical boss.

[0011] Furthermore, the opening and closing latch is movably installed inside the locking button, and a locking card plate is installed inside the locking button.

[0012] Furthermore, a buffer cover is fixed inside the shell, an arc-shaped cavity is opened between the buffer cover and the shell, a noise reduction sponge is fixedly installed inside the arc-shaped cavity, and an opening is opened on the side of the shell.

[0013] Beneficial effects of the utility model:

[0014] 1. This is an airtight positive pressure protective helmet. When in use, an arc-shaped cavity is opened between the helmet shell and the buffer cover. The noise reduction sponge inside the arc-shaped cavity absorbs and reduces noise to prevent external noise from affecting the user inside the helmet. At the same time, the air entering the arc-shaped cavity cools the top of the head to ensure the comfort of the user.

[0015] 2. This airtight positive pressure protective helmet uses two automatic exhaust and pressure relief valves with adjustable opening pressure to ensure the stability and reliability of the pressure inside the helmet and make the gas flow in one direction. The exhaust valve will only open when the pressure inside the helmet reaches the set value. When there is no pressure or insufficient pressure inside the helmet, the exhaust valve is closed, which effectively prevents the intrusion of external toxic and harmful gases.

[0016] 3. This airtight positive pressure protective helmet, through the two face window opening and closing buckles, avoids sudden accidents caused by misoperation, and greatly improves the convenience and safety of opening and closing the face window. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of an airtight positive pressure protective helmet according to the present invention;

[0018] Figure 2 This is a side view of the structure of an automatic exhaust and pressure relief valve of an airtight positive pressure protective helmet according to the present invention;

[0019] Figure 3 This is a schematic structural diagram of a side view of an opening and closing knob of an airtight positive pressure protective helmet according to the present invention;

[0020] Figure 4 This is a schematic cross-sectional structure diagram of an opening and closing knob of an airtight positive pressure protective helmet according to the present invention;

[0021] Figure 5 This is a schematic diagram of the visor opening and closing lock structure of an airtight positive pressure protective helmet of the present invention;

[0022] Figure 6 This is a schematic cross-sectional structure diagram of an arc-shaped cavity of an airtight positive pressure protective helmet according to the present invention;

[0023] In the figure: 1. Automatic exhaust and pressure relief valve; 11. Valve body; 12. Valve core; 13. Valve sleeve; 2. Shell; 21. Helmet lower apron; 22. Special-shaped groove; 3. Opening and closing knob; 31. Opening and closing knob retaining ring; 32. Spring pressure adjustment member; 33. Compression spring; 34. Ball; 4. Face window opening and closing member; 41. Opening and closing pin; 42. Cylindrical boss; 5. Transparent face window; 6. Special-shaped sealing rubber ring; 7. Face window opening and closing lock; 71. Lock button; 72. Lock plate; 73. Lock pin; 8. Buffer cover; 9. Arc-shaped cavity; 10. Noise reduction sponge; 16. Opening. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] See also Figures 1 to 6The utility model provides a technical solution: an airtight positive pressure protective helmet, comprising a shell 2, a helmet lower apron 21 fixedly mounted on the bottom of the shell 2, an opening and closing knob 3 mounted on the shell 2, a face window opening and closing member 4 fixed on the opening and closing knob 3, a transparent face window 5 fixedly mounted on the face window opening and closing member 4, an anisotropic sealing rubber ring 6 mounted between the transparent face window 5 and the shell 2, an automatic exhaust and pressure relief valve 1 fixedly mounted on one side of the shell 2, a face window opening and closing lock 7 mounted on the other side of the shell 2, the face window opening and closing lock 7 is connected to the transparent face window 5 In coordination, the automatic exhaust pressure relief valve 1 includes a valve body 11, a sealing ring is installed on the valve body 11, a valve core 12 is movably installed inside the valve body 11, a valve sleeve 13 is movably installed on the valve core 12, a spring mechanism is installed between the valve sleeve 13 and the valve core 12, and the special-shaped sealing rubber ring 6 is pressed by the transparent face window 5 to achieve an airtight seal between the shell 2 and the face window opening and closing member 4. When the face window opening and closing lock 7 is pressed open, the face window opening and closing member 4 rotates counterclockwise according to the rotation axis of the opening and closing knob 3, and the face window opening and closing member 4 is opened. At this time, a connected atmospheric environment is formed inside and outside the shell 2.

[0026] When the cam 32 is in the closed position, the spring 33 is pressed against the cam 32 and the spring 33 is pressed against the cam 32 to release the pressure.

[0027] When the lock button 71 is pressed down, the locking pin 73 is pressed down and the locking plate 72 is engaged with the locking plate 73.

[0028] When the device is in use, the transparent mask 5 is rotated through the window opening and closing piece 4 to seal the shell 2 as a whole, and the special-shaped sealing rubber ring 6 is pressed by the transparent window 5 to achieve an airtight seal between the shell 2 and the window opening and closing piece 4. When the window opening and closing lock 7 is pressed to open, the window opening and closing piece 4 is rotated counterclockwise according to the rotation axis of the opening and closing knob 3, and the window opening and closing piece 4 is opened. At this time, a connected atmospheric environment is formed inside and outside the shell 2. When the transparent window 5 is in use, the window opening and closing lock 7 is also provided with two sets of compression springs. The lock latch 73 is blocked by the structure of the shell 2. The lock latch 73 is also blocked by the cylindrical boss 42 of the window opening and closing piece 4 to move upward, and the opening and closing pin 41 fixed to the window opening and closing piece 4 by gluing is stuck by the lock clip 72, thereby realizing the closed locking function of the window opening and closing piece 4. When the lock button 71 is pressed until the lock latch 73 and the center of the cylindrical boss 42 are aligned, the lock latch 73 and the cylindrical boss 42 are aligned. If locking sill 75 , has locking sill 75 and is located in the state that stretches out guide pin 74, and latch lock 7 is in the solid state of bolt 71, and latch lock 7 is in the state that stretches out guide pin 74, and latch lock 7 is in the state that stretches out guide pin 74, and is located in the state that stretches out guide pin 74.

[0029] In addition, a plurality of square grooves are provided on the outer circular end of the opening and closing knob snap ring 31, which are embedded and clamped with the square boss on the face window opening and closing piece 4, so that the opening and closing knob snap ring 31 cannot form relative axial rotational movement with the face window opening and closing piece 4. At the same time, the opening and closing knob snap ring 31 is also provided with a spring pressure adjustment part 32, a compression spring 33 and a ball 34. The opening and closing knob snap ring 31 and the shell 2 are clearance-fitted, and the opening and closing knob snap ring 31 can rotate along the rotation center axis. When the opening and closing knob snap ring 31 is in the current position, under the action of the compression spring 33, the ball 34 is pushed out into the spherical groove of the helmet main shell 2, and the action force of the compression spring 33 is partially released. At this time, the compression spring 33 is still in When the opening and closing knob snap ring 31 is in the compressed state, when it is desired to continue to rotate the opening and closing knob snap ring 31, a greater external force is required to squeeze the ball 34 into the through hole of the opening and closing knob snap ring 31, thereby achieving the purpose of rotational resistance. When the opening and closing knob snap ring 31 continues to rotate counterclockwise until the ball 34 is stuck in the special-shaped groove 22 of the shell 2, the ball 34 is stuck deeper in the special-shaped groove 22. At this time, the opening and closing knob snap ring 31 cannot be further rotated counterclockwise by external force, and can only be rotated clockwise, thereby realizing the counterclockwise rotation position limitation of the opening and closing knob snap ring. Since the opening and closing knob snap ring 31 and the face window opening and closing member 4 cannot rotate relative to each other, the opening position limitation of the face window opening and closing member 4 is realized.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An airtight positive pressure protective helmet, comprising a shell (2), characterized in that: The bottom of the shell (2) is fixedly mounted with a lower apron of the helmet (21); an opening and closing knob (3) is mounted on the shell (2); a face window opening and closing member (4) is fixed on the opening and closing knob (3); a transparent face window (5) is fixedly mounted on the face window opening and closing member (4); an anisotropic sealing rubber ring (6) is mounted between the transparent face window (5) and the shell (2); an automatic exhaust and pressure relief valve (1) is fixedly mounted inside one side of the shell (2); a face window opening and closing lock buckle (7) is mounted on the other side of the shell (2); and the face window opening and closing lock buckle (7) cooperates with the transparent face window (5).

2. The airtight positive pressure protective helmet according to claim 1, characterized in that: The automatic exhaust pressure relief valve (1) comprises a valve body (11), a sealing ring is installed on the valve body (11), a valve core (12) is movably installed inside the valve body (11), a valve sleeve (13) is movably installed on the valve core (12), and a spring mechanism is installed between the valve sleeve (13) and the valve core (12).

3. The airtight positive pressure protective helmet according to claim 2, characterized in that: A hole is formed on the valve sleeve (13), and the valve sleeve (13) is installed on the valve core (12) through a thread. An O-type sealing ring is installed between the valve body (11) and the housing (2), and a special-shaped groove (22) is formed on the housing (2).

4. The airtight positive pressure protective helmet according to claim 1, characterized in that: The opening and closing knob (3) comprises an opening and closing knob snap ring (31), a spring pressure regulating member (32) is movably mounted inside the opening and closing knob snap ring (31), and a compression spring (33) is mounted on the spring pressure regulating member (32).

5. The airtight positive pressure protective helmet according to claim 4, characterized in that: A ball (34) is installed at one end of the compression spring (33), and the ball (34) is in movably contact with the special-shaped groove (22).

6. The airtight positive pressure protective helmet according to claim 1, characterized in that: The face window opening and closing member (4) comprises an opening and closing latch (41) and a cylindrical boss (42); the face window opening and closing lock (7) comprises a lock button (71); a lock latch (73) is movably installed inside the lock button (71); and the lock latch (73) cooperates with the cylindrical boss (42).

7. The airtight positive pressure protective helmet according to claim 6, characterized in that: The opening and closing latch (41) is movably mounted inside the locking button (71), and a locking card plate (72) is mounted inside the locking button (71).

8. The airtight positive pressure protective helmet according to claim 1, characterized in that: A buffer cover (8) is fixed inside the shell (2), an arc-shaped cavity (9) is opened between the buffer cover (8) and the shell (2), a noise reduction sponge (10) is fixedly installed inside the arc-shaped cavity (9), and an opening (16) is opened on the side of the shell (2).

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