Pressure release valve mechanism capable of supplementing air

Abstract

The utility model discloses a pressure release valve mechanism capable of supplying air, which comprises a pressure release base assembly, an air reversing circulation assembly capable of assisting in switching air supply and pressure release channels is arranged in the pressure release base assembly, one end of the pressure release base assembly is connected with an air bag sealing cover, and the other end of the pressure release valve base assembly is an air inlet end and can be connected with an external air supply device. The pressure relief base assembly comprises a first connecting base and a second connecting base which are connected through a plurality of grid bars, and the gas reversing circulation assembly can move relative to the pressure relief base assembly under the action of external force to change a gas supply passage and a gas release passage of the pressure relief valve mechanism. Therefore, air can be supplied to the air bag from the outside for breathing of a human body, the problem of suffocation feeling of a user due to initial wearing of the chemical oxygen respirator is solved, air exchange is realized, the oxygen concentration of the chemical oxygen respirator at the initial reaction stage is improved, external complex air can be prevented from entering a closed air circulation path, and safety guarantee is provided for the user.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire-fighting equipment, relates to a pressure relief valve mechanism, and particularly relates to a pressure relief valve mechanism capable of supplementing air. Background Art

[0002] A chemical oxygen respirator is a personal respiratory protection device made based on the principle of generating oxygen by chemical agents. During the entire use process, breathing actions are isolated from the outside world and are not harmed by any toxic, harmful gases or smokes in the outside world. Therefore, it is applicable to various environments with toxic, harmful gases and lack of oxygen. A chemical oxygen respirator generally consists of a face mask, a breathing mask, an oxygen generating canister, and an airbag. As the gas generated by the oxygen generating canister is continuously transmitted into the airbag, the air pressure in the airbag will gradually increase. To ensure the safety of use, a pressure relief valve that can only relieve pressure unidirectionally is installed on the airbag to reduce the air pressure in the airbag.

[0003] Before the chemical oxygen respirator is initially worn, generally the airbag is in a deflated state. If a person wears it directly, a completely enclosed space isolated from the outside world will be formed. The user's inhalation action cannot obtain available gas from the airbag, thus the breathing action cannot be completed, resulting in a feeling of suffocation and the inability to activate the reaction of the chemical agents in the oxygen generating canister, and the inability to achieve gas exchange between human breathing and the oxygen generating canister and the airbag. The gas in the airbag of the existing chemical oxygen respirator can only be generated through the reaction of the chemical agents in the oxygen generating canister and cannot be filled with gas from the outside for the user to breathe. The user can only blow air into the oxygen generating canister three or more times from the sealing cover at the mouth and nose breathing place before wearing. The gas will react with the oxygen generating agent when entering the oxygen generating canister. The gas after the initial reaction enters the airbag for the user to breathe after wearing; generally, the breathing frequency of an average adult at rest is about 12 - 20 times per minute, and the time for blowing three breaths is about ten seconds; in a dangerous and changeable environment, toxic and harmful gases in the environment will be inhaled during the process of blowing air. For each additional second of exposure, there is an additional second of risk, and it is very difficult to execute this step very calmly, and there may be omissions in the steps. Once this step is omitted, the suffocation feeling during the initial wearing cannot be avoided, which will bring great risks. Moreover, at the initial wearing, the oxygen generation efficiency of the oxygen generating agent is slightly low and slightly lagging, and the effective oxygen content available for the user in the airbag will be low, and there may also be a situation of short-term stuffiness (20 - 60 seconds, varying from person to person) in the early stage, causing discomfort to the human body. Summary of the Invention

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a pressure relief valve mechanism capable of supplementing air, which can solve the technical problem that the existing pressure relief valve can only relieve pressure unidirectionally and cannot supplement air.

[0005] To solve the above technical problem, the utility model is realized by adopting the following technical scheme:

[0006] A pressure relief valve mechanism capable of supplementing qi, comprising a pressure relief base assembly, in which a gas commutation and circulation assembly capable of axially moving along the pressure relief base assembly is installed. One end of the pressure relief base assembly is connected with an airbag sealing cover, and the other end of the pressure relief base assembly is an air inlet end;

[0007] The pressure relief base assembly includes a first connection base and a second connection base arranged coaxially. Circular connection bodies are arranged on the outer edges of the opposite ends of the first connection base and the second connection base. A plurality of equally spaced grid bars are arranged along the axial direction on the inner wall of the second connection base. The ends of the plurality of grid bars extend out of one end of the second connection base and are fixedly connected with the connection body of the first connection base;

[0008] A pressure relief base fastening ring is installed on the first connection base. A pressure relief base sealing gasket ring is arranged between the pressure relief base fastening ring and the connection body of the first connection base. The airbag sealing cover is installed on the second connection base, and a sealing cover gasket is arranged between the airbag sealing cover and the connection body of the second connection base;

[0009] The gas commutation and circulation assembly includes a commutation sliding base arranged in the second connection base. The outer circumferential wall of the commutation sliding base is in contact with the grid bars. A conical spring is arranged between one side of the commutation sliding base and the airbag sealing cover. A support ring is coaxially arranged on the other side of the commutation sliding base. The support ring and the commutation sliding base are fixedly connected by a plurality of connecting columns. A one-way pressure relief umbrella piece is installed on the commutation sliding base inside the connecting columns. The commutation sliding base outside the connecting columns is in contact with the connection body of the first connection base. The support ring is arranged in the first connection base;

[0010] The open end of the first connection base is the air inlet end.

[0011] The present utility model further includes the following technical features:

[0012] A fixing hole is axially opened in the middle of the commutation sliding base. A plurality of pressure relief holes are equally spaced along the circumference of the fixing hole on the commutation sliding base; The one-way pressure relief umbrella piece includes a bowl-shaped umbrella piece body and a connecting rod. One end of the connecting rod is fixedly connected to the inner center of the umbrella piece body. The other end of the connecting rod passes through the fixing hole and extends into the conical spring to install the one-way pressure relief umbrella piece on the commutation sliding base. An anti-detachment convex edge is arranged along the circumference on the connecting rod. The anti-detachment convex edge and the umbrella piece body are respectively arranged on both sides of the fixing hole. The umbrella piece body completely covers the plurality of pressure relief holes.

[0013] A sealing gasket ring is arranged between the commutation sliding base and the connection body of the first connection base. The sealing gasket ring is fixedly installed on the commutation sliding base.

[0014] On the end face on the outer side of the support ring, a disc-shaped pressing net cover is covered. The pressing net cover is coaxially arranged with the support ring, and the pressing net cover can be snap-fitted and installed on the support ring.

[0015] The diameter of the pressing net cover is larger than the inner diameter of the support ring. A plurality of axially arranged grooves are equidistantly formed in the circumferential direction on the outer side wall of the pressing net cover. A clamping post is arranged in each groove. One end of the clamping post is fixed in the groove, and a clamping protrusion is integrally arranged on the side wall of the other end of the clamping post facing away from the central axis of the pressing net cover. The other ends of the plurality of clamping posts pass through the support ring, and the pressing net cover is snap-fitted and fixed on the support ring by the clamping protrusion.

[0016] The pressure relief base fastening ring includes a fastening ring body. An outer edge of one end of the fastening ring body facing the connecting body of the first connecting base is integrally provided with a pressing ring. A plurality of operation bosses are circumferentially and equidistantly distributed on the side of the pressing ring facing away from the connecting body of the first connecting base. An installation card hole is machined axially on each operation boss.

[0017] Compared with the prior art, the utility model has the following technical effects: -

[0018] (Ⅰ) The pressure relief valve mechanism of the utility model has a reasonable structure, is easy to assemble, has strong stability, is easy to operate. The driving gas commutation and circulation component can move relative to the pressure relief base component to change the air supplement and air release passages, can realize the traditional pressure relief function, and can also be connected with an external air supplement device. In the initial stage of using a chemical oxygen breathing apparatus, the airbag can be quickly changed from an empty and airless state to an inflated state for the user to perform gas exchange during breathing, providing a precondition for activating the oxygen-generating agent in the oxygen generator canister to release oxygen, avoiding the risk of low oxygen concentration in the initial stage of the reaction, providing safety guarantee for the user, winning time for the user, providing a sufficient and continuous oxygen source for the user, and improving the use safety.

[0019] (Ⅱ) The structural settings of the pressure relief base component and the gas commutation and circulation component in the utility model not only ensure the sealing performance of the pressure relief valve mechanism relative to the airbag, but also enable the whole device to realize the one-way flow of gas in both the air supplement and pressure relief states. Brief Description of the Drawings

[0020] Figure 1 is a cross-sectional schematic view of Embodiment 1 of the utility model.

[0021] Figure 2 is a cross-sectional three-dimensional schematic view of Embodiment 1 of the utility model.

[0022] Figure 3 is a schematic view of the pressure relief base component of Embodiment 1 of the utility model.

[0023] Figure 4It is a schematic cross-sectional view of the pressure relief base assembly of Example 1 of the utility model.

[0024] Figure 5 It is a cross-sectional stereoscopic schematic diagram of the pressure relief base assembly of Example 1 of the present utility model.

[0025] Figure 6 It is a cross-sectional schematic diagram of embodiment 2 of the present utility model.

[0026] Figure 7 It is a cross-sectional stereoscopic schematic diagram of embodiment 2 of the present utility model.

[0027] Figure 8 It is a schematic cross-sectional view of the overall structure of Example 3 of the present utility model.

[0028] Figure 9 It is a three-dimensional diagram of the disassembly, insertion and fixing assembly of Example 3 of the utility model.

[0029] Figure 10 It is an exploded view of the overall structure of Example 3 of the utility model.

[0030] The meaning of each number in the figure is:

[0031] 1. Pressure relief base assembly, 2. Gas reversing circulation assembly, 3. Air bag sealing cover, 4. Gas replenishment cylinder, 5. Gas cylinder base assembly, 6. Quick opening assembly, 7. Removal and insertion fixing assembly;

[0032] 11. first connecting base, 12. second connecting base, 13. connecting body, 14. grid bar, 15. fastening screw ring of pressure relief base, 16. sealing gasket ring of pressure relief base, 17. sealing cover gasket;

[0033] 111, card slot bar hole;

[0034] 151, fastening screw ring body, 152, top pressure ring, 153, operating boss, 154, installation card hole, 155, limit card slot;

[0035] 21. reversing sliding base, 22. conical spring, 23. support ring, 24. connecting column, 25. one-way pressure relief umbrella piece, 26. pressing net cover, 27. sealing gasket ring;

[0036] 211, fixing hole, 212, pressure relief hole;

[0037] 251, umbrella piece body, 252, connecting rod, 253, anti-dropping convex edge;

[0038] 261, groove, 262, clamping column, 263, clamping protrusion;

[0039] 51. Opening chamber, 52. Cylinder installation base, 53. Quick connection base, 54. First through hole, 55. Second through hole, 56. Cylinder sealing ring, 57. Propulsion return spring, 58. Support plate, 59. Support hole;

[0040] 531. Annular clamping groove, 532. Annular placement groove, 533. Plugging and unplugging sealing ring;

[0041] 61. Propulsion body, 62. Opening ejector pin, 63. Lever;

[0042] 611. Annular groove, 612. Propulsion sealing ring;

[0043] 631. Pressing arm, 632. Driving arm, 633. Lever rotating shaft, 634. Pressing head, 635. Lever extension rope, 636. Pull ring;

[0044] 71. Clamping protection cover, 72. Plugging and unplugging snap ring, 73. Plugging and unplugging button, 74. Anti - detachment rod;

[0045] 711. Installation hole, 712. Strip - shaped hole, 713. Limit protrusion;

[0046] 721. Snap ring body, 722. Clamping rod.

[0047] The following further elaborates on the specific content of the present utility model in conjunction with embodiments. Specific embodiments

[0048] Complying with the above - mentioned technical solutions, the following are the specific embodiments of the present utility model. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present utility model.

[0049] In the present utility model, in the absence of contrary explanations, the orientation words such as "upper", "lower", "left", "right", etc. usually refer to those defined based on the drawing plane of the corresponding drawings, and "inner" and "outer" refer to the inside and outside of the contour of the corresponding components.

[0050] Embodiment 1:

[0051] This embodiment provides a pressure - relief valve mechanism capable of refilling air, as Figures 1 to 5 shown, including a pressure - relief base assembly 1. A gas commutation and circulation assembly 2 that can move axially along the pressure - relief base assembly 1 is installed inside the pressure - relief base assembly 1. One end of the pressure - relief base assembly 1 is connected with an airbag sealing cover 3, and the other end of the pressure - relief base assembly 1 is the air inlet end;

[0052] The pressure relief base assembly 1 includes a first connection base 11 and a second connection base 12 arranged coaxially. Circular connection bodies 13 are provided at the outer edges of the opposite ends of the first connection base 11 and the second connection base 12. A plurality of equally spaced grid bars 14 are arranged along the axial direction on the inner wall of the second connection base 12. The ends of the plurality of grid bars 14 extend out of one end of the second connection base 12 and are fixedly connected to the connection body 13 of the first connection base 11;

[0053] A pressure relief base fastening ring 15 is installed on the first connection base 11. A pressure relief base gasket ring 16 is arranged between the pressure relief base fastening ring 15 and the connection body 13 of the first connection base 11. An airbag sealing cover 3 is installed on the second connection base 12. A sealing cover gasket 17 is arranged between the airbag sealing cover 3 and the connection body 13 of the second connection base 12;

[0054] The gas commutation and flow-through assembly 2 includes a commutation sliding base 21 arranged in the second connection base 12. The outer circumferential wall of the commutation sliding base 21 is in contact with the grid bars 14. A conical spring 22 is arranged between one side of the commutation sliding base 21 and the airbag sealing cover 3. A support ring 23 is coaxially arranged on the other side of the commutation sliding base 21. The support ring 23 and the commutation sliding base 21 are fixedly connected by a plurality of connection columns 24. A one-way pressure relief umbrella piece 25 is installed on the commutation sliding base 21 inside the connection columns 24. The commutation sliding base 21 outside the connection columns 24 is in contact with the connection body 13 of the first connection base 11. The support ring 23 is arranged in the first connection base 11;

[0055] The open end of the first connection base 1 is the air inlet end.

[0056] The pressure relief valve mechanism in this embodiment is applicable to a chemical oxygen breathing apparatus equipped with a bag-shaped airbag. The connecting body 13 of the first connecting base 11 and the second connecting base 12 is disposed inside the airbag. The two open ends of the first connecting base 11 and the second connecting base 12 facing away from each other respectively extend outside the airbag. The open end of the second connecting base 12 is threadedly connected to the airbag sealing cover 3. The sealing cover gasket 17 can ensure the airtightness between the connecting body 13 of the second connecting base 12, the airbag sealing cover 3 and the airbag wall. The open end of the first connecting base 11 is threadedly connected to the pressure relief base fastening ring 15. The pressure relief base sealing gasket ring 16 can ensure the airtightness between the connecting body 13 of the first connecting base 11, the pressure relief base fastening ring 15 and the airbag wall. The open end of the first connecting base 11 can be connected to an external air supply device. The internal space surrounded by the first connecting base 11, the second connecting base 13 and multiple grid bars 14 is a gas flow space. Due to the arrangement of the grid bars 14, there is a certain distance between the connecting bodies 13 of the first connecting base 11 and the second connecting base 12. Through holes for gas to flow through are formed between the connecting body 13 and the grid bars 14. In the initial state of the chemical oxygen breathing apparatus, there is no gas available for the user in the airbag. Gas can be filled into the airbag through the open end of the first connecting base 11 for the user to use. Specifically, the end of the external air supply device is inserted into the open end of the first connecting base 11. The end of the external air supply device has a thrust force moving in the direction of the second connecting base 12 on the support ring 23. This thrust force is transmitted to the commutation sliding base 21 through the connecting rod 24. The commutation sliding base 21 compresses the conical spring 22. The edge of the commutation sliding base 21 is separated from the end face of the connecting body 13 of the first connecting base 11. The through hole between the connecting body 13 and the grid bars 14 is connected to the inside of the first connecting base 11 through the space between the support ring 23 and the connecting column 24, forming an air supply path. The gas provided by the external air supply device enters the airbag through the through hole between the connecting body 13 and the grid bars 14 for the user to use. The one-way pressure relief umbrella piece 25 enables the gas to flow only along the air supply path. After sufficient gas is replenished, the external air supply device is removed from the first connecting base 11. After the chemical oxygen breathing apparatus works for a period of time, there is a certain probability that the gas in the airbag reaches saturation, and it is necessary to discharge the excess gas to reduce the air pressure in the airbag. The commutation sliding base 21 moves in the direction of the first connecting base 11 under the elastic force of the conical spring 22 and finally abuts against the end face of the connecting body 13 of the first connecting base 11. The through hole between the connecting body 13 and the grid bars 14 is connected to the inside of the second connecting base 12, forming an air release path. The excess gas in the airbag can enter the inside of the second connecting base 12 through the through hole between the connecting body 13 and the grid bars 14, and then flow to the inside of the first connecting base 11 through the one-way pressure relief umbrella piece 25 on the commutation sliding base 21, and finally be discharged to the outside through the open end of the first connecting base 11 to achieve the purpose of airbag pressure relief. The gas commutation flow component 2 can move relative to the pressure relief base component 1 to change the air supply and air release paths.Provide a sufficient and continuous oxygen source for users to improve the safety of use.

[0057] As a preferred solution of this embodiment, a fixing hole 211 is axially formed in the middle of the commutation sliding base 21 in this embodiment, and a plurality of pressure relief holes 212 are equidistantly arranged along the circumference of the fixing hole 211 on the commutation sliding base 21; the one-way pressure relief umbrella piece 25 includes a bowl-shaped umbrella piece body 251 and a connecting rod 252. One end of the connecting rod 252 is fixedly connected to the inner center of the umbrella piece body 251, and the other end of the connecting rod 252 passes through the fixing hole 211 and extends into the conical spring 22 to install the one-way pressure relief umbrella piece 25 on the commutation sliding base 21. An anti-detachment convex edge 253 is arranged along the circumference on the connecting rod 252. The anti-detachment convex edge 253 and the umbrella piece body 251 are respectively arranged on both sides of the fixing hole 211. The distance between the anti-detachment convex edge 253 and the umbrella piece body 251 is slightly larger than the length of the fixing hole 211, ensuring that the one-way pressure relief umbrella piece 25 can have a small floating displacement relative to the commutation sliding base 21. The umbrella piece body 251 completely covers the plurality of pressure relief holes 252 to prevent external gas from entering the airbag through the air release passage.

[0058] Further, a sealing gasket ring 27 is arranged between the connection body 13 of the commutation sliding base 21 and the first connection base 11. The sealing gasket ring 27 is fixedly installed on the commutation sliding base 21. When the device is in the air replenishment state, the sealing gasket ring 27 is separated from the connection body 13 of the first connection base 11, and the umbrella piece body 251 buckles on the commutation sliding base 21 and can completely cover the plurality of pressure relief holes 252. The gas entering the pressure relief base assembly 1 cannot enter the second connection base 12 through the commutation sliding base 21 and can only enter the airbag through the through hole between the connection body 13 and the grid bars 14. When the device is in the pressure relief state, the sealing gasket ring 27 is in close fit with the connection body 13 of the first connection base 11, circumferentially blocking the direct connection between the through hole between the connection body 13 and the grid bars 14 and the first connection base 11. The gas in the airbag only enters the second connection base 12 through the through hole between the connection body 13 and the grid bars 14. The gas pressure in the second connection base 12 pushes up the umbrella piece body 251, and the gas flows into the first connection base 11 through the plurality of pressure relief holes 252.

[0059] As a preferred solution of this embodiment, a circular pressing mesh cover 26 is covered on the outer end face of the support ring 23 in this embodiment. The pressing mesh cover 26 is coaxially arranged with the support ring 23. The pressing mesh cover 26 can be snap-fitted on the support ring 23. The pressing mesh cover 26 can increase the pressing contact surface, facilitating the effective application of force to the gas commutation and circulation assembly 2 by the end of the external air replenishment device.

[0060] Specifically, the diameter of the pressing mesh cover 26 is larger than the inner diameter of the support ring 23. A plurality of axially arranged grooves 261 are equidistantly formed in the circumferential direction on the outer side wall of the pressing mesh cover 26. A clamping post 262 is arranged in each groove 261. One end of the clamping post 262 is fixed in the groove 261. On the side wall of the other end of the clamping post 262 facing away from the central axis of the pressing mesh cover 26, a clamping protrusion 263 is integrally provided. The other ends of the plurality of clamping posts 262 pass through the support ring 23, and the clamping protrusion 263 clamps and fixes the pressing mesh cover 26 on the support ring 23, ensuring the stability of the pressing mesh cover 26 relative to the support ring 23. In the air supplement state, the gas entering the first connection base 11 from the external air supplement device passes through the mesh holes on the pressing mesh cover 26 into the space between the support ring 23 and the connecting column 24, and then enters the airbag through the through holes between the connecting body 13 and the grid bars 14.

[0061] As a preferred solution of this embodiment, in this embodiment, the pressure relief base fastening ring 15 includes a fastening ring body 151. An outer edge of one end of the fastening ring body 151 facing the connecting body 13 of the first connection base 11 is integrally provided with a pressing ring 152. The pressing ring 152 can increase the contact surface between the pressure relief base fastening ring 15 and the connecting body 13 of the first connection base 11. Combined with the pressure relief base sealing gasket ring 16, the airtightness between the first connection base 11 and the airbag is improved. A plurality of operation bosses 153 are circumferentially and equidistantly distributed on the side surface of the pressing ring 152 facing away from the connecting body 13 of the first connection base 11. During the production and assembly process, the operation bosses 153 can increase the operation contact surface, facilitating the tightening and assembly of the fastening ring body 151 on the first connection base 11. Further, an installation clamping hole 154 is axially processed on each operation boss 153. A claw wrench or other tool is used to be stuck in the installation clamping hole 154 to make the assembly quicker.

[0062] Embodiment 2:

[0063] This embodiment provides a rapid air supplement mechanism, as Figures 6 to 7 shown, including a gas cylinder base assembly 5, on which a gas supplement cylinder 4 and a quick opening assembly 6 are installed;

[0064] The gas cylinder base assembly 5 includes an opening cabin 51 with an open top. The bottom end of the opening cabin 51 is integrally provided with a gas cylinder installation base 52. A quick connection base 53 is integrally provided on the side wall of the opening cabin 51. A first through hole 54 communicating with the gas cylinder installation base 52 is opened at the bottom of the opening cabin 51. A second through hole 55 communicating with the quick connection base 53 is opened on the side wall of the opening cabin 51;

[0065] The mouth of the air supplement gas cylinder 4 is integrally welded and sealed by a metal sealing sheet. The air supplement gas cylinder 4 is installed in the gas cylinder installation base 52. The mouth of the air supplement gas cylinder 4 is coaxially arranged with the first through hole 54. The quick opening assembly 6 includes a propulsion body 61 and a quick opening thimble 62 arranged in the opening cabin 51. The bottom end of the propulsion body 61 is fixedly connected to the top end of the quick opening thimble 62. The top end of the propulsion body 61 is higher than the top end of the opening cabin 51. The quick opening thimble 62 is coaxially arranged with the first through hole 54.

[0066] In this embodiment, the quick connection base 53 in the quick air supplement mechanism is connected to the installation port on the airbag of the chemical oxygen breathing apparatus. The quick air supplement mechanism can quickly fill the airbag with gas. Specifically, the end of the quick opening thimble 62 passes through the first through hole 54 to pierce the metal sealing sheet at the mouth of the air supplement gas cylinder 4 arranged in the gas cylinder installation base 52. The compressed air in the air supplement gas cylinder 4 enters the opening cabin 51 through the first through hole 54 and then enters the quick connection base 53 through the second through hole 55, and finally enters the airbag, providing gas exchange during breathing for the user in the initial stage of wearing the chemical oxygen breathing apparatus, and can further activate the oxygen-generating agent in the oxygen generator to release oxygen.

[0067] As a preferred solution of this embodiment, a propulsion return spring 57 is arranged in the opening cabin 51 in this embodiment. The bottom of the propulsion return spring 57 is in contact with the bottom surface of the opening cabin 51. The top of the propulsion return spring 57 supports the lower end surface of the propulsion body 61. The lower end of the quick opening thimble 62 passes through the propulsion return spring 57 and extends into the first through hole 54. The propulsion return spring 57 can realize the separation between the quick opening thimble 62 and the mouth of the air supplement gas cylinder 4. The second through hole 55 is located on the side of the propulsion return spring 57.

[0068] Furthermore, an annular groove 611 is formed in the circumferential direction on the propulsion body 61. A propulsion sealing ring 612 is arranged in the annular groove 611. The propulsion sealing ring 612 is in contact with the inner wall of the opening cabin 51. The arrangement positions of the propulsion sealing ring 612 and the second through hole 55 ensure that the gas released from the air supplement gas cylinder 4 can only flow through the first through hole 54 and the second through hole 55 and will not overflow from the top of the opening cabin 51.

[0069] As a preferred solution of this embodiment, a gas cylinder sealing ring 56 is arranged between the mouth of the air supplement gas cylinder 4 and the bottom end of the opening cabin 51 in this embodiment to prevent the compressed air in the air supplement gas cylinder 4 from overflowing from the installation end of the gas cylinder installation base 52.

[0070] As a preferred solution of this embodiment, the quick-opening component 6 in this embodiment further includes a lever 63. The lever 63 includes a horizontally arranged pressing arm 631 and a vertically arranged driving arm 632. A pair of support plates 58 symmetrically arranged with respect to the opening cabin 51 are provided on the outer wall of the opening cabin 51. A support hole 59 is opened at the upper part of each of the pair of support plates 58. A lever rotating shaft 633 is installed in the pair of support holes 59. The lever rotating shaft 633 passes through the pressing arm 631 to arrange the pressing arm 631 above the propulsion body 61. One end of the pressing arm 631 is fixedly connected to the top end of the driving arm 632. The other end of the pressing arm 631 is a circular-arc pressing head 634. The bottom end of the pressing head 634 is in contact with the top end of the propulsion body 61. The support plate 58 plays a role in supporting the lever 63. The lever 63 rotates with the lever rotating shaft 633 as a reference. By pulling up the driving arm 632, the pressing head 634 at the other end of the pressing arm 631 applies a downward moving force to the propulsion body 61. By pressing down the driving arm 632, the pressing head 634 is driven to lift. The propulsion body 61 returns to the initial position under the elastic force of the propulsion return spring 57. The end face of the propulsion body 61 is small, and it is not convenient to quickly press in an emergency. The quick pressing can be realized through the lever 63, and then the air supplement gas cylinder 4 can be quickly opened.

[0071] As a preferred solution of this embodiment, an annular placement groove 532 is circumferentially opened on the outer wall of the open end of the quick-connection base 53 in this embodiment. A plugging sealing ring 533 is arranged in the annular placement groove 532. The quick-connection base 53 is installed in the installation opening on the airbag. The plugging sealing ring 533 can improve the airtightness of the connection between the two and avoid gas leakage.

[0072] As a preferred solution of this embodiment, a lever extension rope 635 is installed at the bottom end of the driving arm 632 in this embodiment. A pull ring 636 is arranged at the movable end of the lever extension rope 635. In an emergency, the user can operate the lever 63 only by pulling the lever extension rope 635.

[0073] Embodiment 3:

[0074] This embodiment provides a pressure relief valve with a detachable and quick air supplement mechanism, as Figures 1 to 10 shown, including a pressure relief valve mechanism. The pressure relief valve mechanism includes a pressure relief base assembly 1. A gas commutation and circulation component 2 that can move axially along the pressure relief base assembly 1 is installed in the pressure relief base assembly 1. One end of the pressure relief base assembly 1 is connected with an airbag sealing cover 3, and the other end of the pressure relief base assembly 1 is connected with a quick air supplement mechanism. The pressure relief valve mechanism adopts the pressure relief valve mechanism in Embodiment 1, and the quick air supplement mechanism adopts the quick air supplement mechanism in Embodiment 2;

[0075] Specifically, the quick-connect base 53 is inserted into the open end of the first connection base 11, and the end of the open end of the quick-connect base 53 is in pressing contact with the end of the gas commutation and flow component 2. The outer diameter of the quick-connect base 53 matches the inner diameter of the first connection base 11.

[0076] The pressure relief valve in this embodiment is applicable to a chemical oxygen breathing apparatus equipped with a bag-shaped airbag. The connecting body 13 of the first connecting base 11 and the second connecting base 12 is disposed inside the airbag. The two open ends of the first connecting base 11 and the second connecting base 12 facing away from each other respectively extend outside the airbag. The open end of the second connecting base 12 is threadedly connected to the airbag sealing cover 3. The sealing cover gasket 17 can ensure the airtightness among the connecting body 13 of the second connecting base 12, the airbag sealing cover 3, and the airbag wall. The open end of the first connecting base 11 is threadedly connected to the pressure relief base fastening ring 15. The pressure relief base sealing gasket ring 16 can ensure the airtightness among the connecting body 13 of the first connecting base 11, the pressure relief base fastening ring 15, and the airbag wall. The internal space enclosed by the first connecting base 11, the second connecting base 13, and multiple grid bars 14 is a gas flow space. Due to the arrangement of the grid bars 14, there is a certain distance between the connecting bodies 13 of the first connecting base 11 and the second connecting base 12. Through holes for gas to flow through are formed between the connecting body 13 and the grid bars 14. In the initial state of the chemical oxygen breathing apparatus, there is no gas available for the user in the airbag. The quick air replenishing mechanism installed on the first connecting base 11 can quickly fill the airbag with compressed air in the air replenishing gas cylinder 4 for the user to use. Specifically, the quick connecting base 53 is inserted into the open end of the first connecting base 11. The end of the quick connecting base 53 has a thrust force on the support ring 23 in the direction towards the second connecting base 12. This thrust force is transmitted to the reversing sliding base 21 through the connecting rod 24. The reversing sliding base 21 compresses the conical spring 22. The edge of the reversing sliding base 21 is separated from the end face of the connecting body 13 of the first connecting base 11. The through hole between the connecting body 13 and the grid bars 14 is connected to the inside of the first connecting base 11 through the space between the support ring 23 and the connecting column 24, forming an air replenishing passage. Press the pushing body 61, and the end of the opening thimble 62 passes through the first through hole 54 to pierce the sealing film at the bottle mouth of the air replenishing gas cylinder 4 disposed inside the gas cylinder mounting base 52. The compressed air in the air replenishing gas cylinder 4 enters the opening chamber 51 through the first through hole 54 and then enters the quick connecting base 53 through the second through hole 55, and finally enters the airbag through the through hole between the connecting body 13 and the grid bars 14 for the user to use. The one-way pressure relief umbrella piece 25 causes the gas to flow only along the air replenishing passage. The gas cylinder sealing ring 56 prevents the compressed air in the air replenishing gas cylinder 4 from overflowing from the mounting end of the gas cylinder mounting base 52. After the compressed air in the air replenishing gas cylinder 4 is released completely, the quick air replenishing mechanism is removed from the first connecting base 11. After the chemical oxygen breathing apparatus works for a period of time, there is a certain probability that the gas in the airbag reaches saturation, and the excess gas needs to be discharged. At this time, the first connecting base 11 and the quick connecting base 53 of the quick air replenishing mechanism are in a separated state. The reversing sliding base 21 moves towards the first connecting base 11 under the elastic force of the conical spring 22 and finally abuts against the end face of the connecting body 13 of the first connecting base 11. The through hole between the connecting body 13 and the grid bars 14 is connected to the inside of the second connecting base 12.A deflation passage is formed, and the excess gas in the airbag can enter the interior of the second connection base 12 through the through-hole between the connecting body 13 and the grid bar 14, and then flow through the one-way pressure relief umbrella piece 25 on the commutation sliding base 21 to the interior of the first connection base 11, and finally be discharged from the open end of the first connection base 11, achieving the purpose of deflating the airbag. The plug-in connection method between the quick connection base 53 and the first connection base 11 can realize the quick disassembly and insertion of the quick air replenishment mechanism and the pressure relief valve mechanism, and can also drive the gas commutation flow component 2 to move relative to the pressure relief base component 1, changing the air replenishment and deflation passages, providing a sufficient and continuous oxygen source for the user, and improving the use safety.

[0077] As a preferred solution of this embodiment, in order to improve the connection stability between the quick air replenishment mechanism and the pressure relief valve mechanism and prevent the quick air replenishment mechanism from falling off the pressure relief valve mechanism during the movement of the user, the present embodiment further includes a disassembly and insertion fixing component 7. The disassembly and insertion fixing component 7 includes a clamping protection cover 71 sleeved on the first connection base 11. An insertion and extraction spring 72 is arranged inside the clamping protection cover 71. An installation hole 711 through which the first connection base can pass is axially formed on the clamping protection cover 71. A strip-shaped hole 712 is formed on the side wall of the clamping protection cover 71, and a hollow and open-ended insertion and extraction button 73 is installed in the strip-shaped hole 712;

[0078] The plug-in retaining spring 72 includes a retaining spring body 721 with an isosceles trapezoidal structure having one open end. The two symmetrical sides of the retaining spring body 721 are stepped. A raised positioning rod 722 is integrally connected to each of the two free ends of the retaining spring body 721. In this embodiment, the raised part is trapezoidal. The raised parts of a pair of positioning rods 722 are arranged facing each other, that is, the opening directions of a pair of trapezoids are arranged back to back. The closed end of the retaining spring body 721 passes through the strip-shaped hole 712 and is installed in the plug-in button 73. A pair of symmetrically arranged positioning strip-shaped holes 111 are circumferentially formed on the side wall of the first connection base 11. An annular card slot 531 is circumferentially formed on the outer wall of the quick connection base 53. When the quick connection base 53 is inserted into the first connection base 11, the position of the annular card slot 531 corresponds to the positioning strip-shaped holes 111. The retaining spring body 721 is arranged on one side of the first connection base 11. The distance between the two free ends of the retaining spring body 721 matches the outer diameter of the first connection base 11. A pair of positioning rods 722 respectively correspond to the positioning strip-shaped holes 111 in the corresponding directions. The closed ends of the trapezoidal positioning rods 722 respectively pass through the positioning strip-shaped holes 111 in their corresponding directions and extend into the first connection base 11 to be clamped in the annular card slot 531, fixedly installing the quick connection base 53 in the first connection base 11. When it is necessary to disassemble the quick connection base 53 from the first connection base 11, by pressing the plug-in button 73, the plug-in retaining spring 72 is driven to move towards the first connection base 11. The inclined surface of the free end of the trapezoidal structure of the positioning rod 722 moves upward along the edge of the positioning strip-shaped hole 111. When the closed end of the trapezoid of the positioning rod 722 is retracted into the positioning strip-shaped hole 111, the closed end of the trapezoid of the positioning rod 722 is completely disengaged from the annular card slot 531.

[0079] Furthermore, in this embodiment, an annular placement groove 532 parallel to the annular card slot 531 is formed on the outer wall of the open end of the quick connection base 53. An insertion and removal sealing ring 533 is arranged in the annular placement groove 532. The insertion and removal sealing ring 533 is in contact with the inner wall of the first connection base 11 to ensure the airtightness of the connection between the quick connection base 53 and the first connection base 11.

[0080] Furthermore, a pair of circumferentially arranged limit card slots 155 are machined on the outer edge of the pressing ring 152 facing the pressure relief base fastening ring 15. A pair of limit protrusions 713 are circumferentially arranged on the inner wall of the open end of the positioning protection cover 71. The pair of limit protrusions 713 are respectively installed in the corresponding limit card slots 155 to improve the installation stability of the positioning protection cover 71.

[0081] As a preferred solution of this embodiment, in this embodiment, arc-shaped anti-detachment rods 74 are arranged on the two lateral side walls of the open end of the plug-in button 73. The anti-detachment rods 74 pass through the strip-shaped hole 712 and are in contact with the arc-shaped inner side wall of the positioning protection cover 71 to prevent the plug-in button 73 from falling off from the strip-shaped hole 712.

[0082] During the actual operation of this embodiment:

[0083] Before use, it is necessary to first remove the used air supplement gas cylinder 4, install a new air supplement gas cylinder 4 on the gas cylinder installation base 52, and place it properly for use in case of emergency.

[0084] When it is necessary to use the chemical oxygen respirator in case of emergency, the user holds the air supplement gas cylinder 4, inserts the quick connection base 53 into the first connection base 11, fixes the quick connection base 53 on the first connection base 11, wears the chemical oxygen respirator well, pulls up the lever extension cord 635 to drive the driving arm 632 to move upward, the driving arm 632 drives the pressing head 634 to press down the propulsion body 61, the ejector pin 62 is driven to move downward with the propulsion body 61, pierces the sealing film at the mouth of the air supplement gas cylinder 4 through the first through hole 54, and the compressed air in the air supplement gas cylinder 4 enters the airbag through the air supplement passage to supply oxygen to the user. After the compressed air in the air supplement gas cylinder 4 is delivered, press the disassembly and insertion button 73, the disassembly and insertion snap spring 72 is in an open state and no longer restrains the gas cylinder base assembly 5, and the gas cylinder base assembly 5 falls off from the first connection base 11 under the thrust of the conical spring 22. At the same time, the gas filled in the airbag can be used for people to inhale and exhale, and the human body's inhalation and exhalation actions realize gas exchange, and the passage realizes a closed loop. At this time, the gas generated by the oxygen generating canister of the chemical oxygen respirator will be stored in the airbag. When the oxygen generating agent reaction peak is reached, it is possible that the oxygen generating efficiency is too high and too much gas is generated. When the gas volume in the airbag exceeds the maximum volume of the airbag, the excess gas in the airbag is transmitted to the outside through the pressure relief passage of the pressure relief valve mechanism. During the use of the chemical oxygen respirator, when the user needs to replace a new oxygen generating canister or when the airbag is abnormally stressed and a large amount of gas in the airbag is discharged from the pressure relief valve, a new air supplement gas cylinder 4 can be reinstalled into the gas cylinder installation base 52 to repeat the previous installation process or reinstall the quick air supplement mechanism equipped with a new air supplement gas cylinder 4 to provide continuous oxygen for the user.

Claims

1. A pressure relief valve mechanism capable of replenishing air, characterized in that: The pressure relief base assembly (1) comprises a gas reversing circulation assembly (2) which is movable along the axial direction of the pressure relief base assembly (1) and is installed in the pressure relief base assembly (1); one end of the pressure relief base assembly (1) is connected to an air bag sealing cover (3); and the other end of the pressure relief base assembly (1) is an air inlet end; The pressure relief base assembly (1) comprises a first connecting base (11) and a second connecting base (12) which are coaxially arranged, the outer edges of the first connecting base (11) and the second connecting base (12) facing each other are both provided with an annular connecting body (13), the inner wall of the second connecting base (12) is axially provided with a plurality of gratings (14) distributed at equal intervals, the ends of the plurality of gratings (14) extending out of one end of the second connecting base (12) are fixedly connected to the connecting body (13) of the first connecting base (11); The first connection base (11) is provided with a pressure relief base fastening screw (15), a pressure relief base sealing gasket (16) is provided between the pressure relief base fastening screw (15) and the connecting body (13) of the first connection base (11), the airbag sealing cover (3) is provided on the second connection base (12), a sealing cover gasket (17) is provided between the airbag sealing cover (3) and the connecting body (13) of the second connection base (12); The gas reversing circulation component (2) comprises a reversing sliding base (21) arranged in the second connecting base (12), the circumferential outer wall of the reversing sliding base (21) is in contact with the grid bar (14), a conical spring (22) is arranged between one side of the reversing sliding base (21) and the airbag sealing cover (3), a support ring (23) is coaxially arranged on the other side of the reversing sliding base (21), the support ring (23) and the reversing sliding base (21) are fixedly connected through a plurality of connecting columns (24), a one-way pressure relief umbrella sheet (25) is installed on the reversing sliding base (21) on the inner side of the connecting column (24), the reversing sliding base (21) on the outer side of the connecting column (24) is in contact with the connecting body (13) of the first connecting base (11), and the support ring (23) is arranged in the first connecting base (11); The open end of the first connection base (11) is an air inlet end.

2. The pressure relief valve mechanism capable of replenishing air as claimed in claim 1, characterized in that: A fixing hole (211) is axially provided in the middle of the reversing sliding base (21), and a plurality of pressure relief holes (212) are equidistantly provided on the reversing sliding base (21) along the circumference of the fixing hole (211); the one-way pressure relief umbrella piece (25) comprises a bowl-shaped umbrella piece body (251) and a connecting rod (252), one end of the connecting rod (252) is fixedly connected to the inner center of the umbrella piece body (251), and the other end of the connecting rod (252) passes through the fixing hole (211) and extends into the conical spring (22) to install the one-way pressure relief umbrella piece (25) on the reversing sliding base (21), and an anti-slip convex edge (253) is circumferentially provided on the connecting rod (252), and the anti-slip convex edge (253) and the umbrella piece body (251) are respectively provided on both sides of the fixing hole (211), and the umbrella piece body (251) completely covers the plurality of pressure relief holes (212).

3. The pressure relief valve mechanism capable of replenishing air as claimed in claim 1, characterized in that: A sealing ring (27) is provided between the reversing sliding base (21) and the connecting body (13) of the first connecting base (11), and the sealing ring (27) is fixedly mounted on the reversing sliding base (21).

4. The pressure relief valve mechanism capable of replenishing air according to claim 1, characterized in that: The outer end surface of the support ring (23) is covered with a disc-shaped pressing mesh cover (26). The pressing mesh cover (26) is coaxially arranged with the support ring (23). The pressing mesh cover (26) can be snap-fitted and installed on the support ring (23).

5. The pressure relief valve mechanism capable of replenishing air as claimed in claim 4, characterized in that: The diameter of the pressing mesh cover (26) is larger than the inner diameter of the support ring (23). A plurality of axially arranged grooves (261) are provided on the outer wall of the pressing mesh cover (26) at equal intervals in the circumferential direction. A clamping column (262) is provided in each of the grooves (261). One end of the clamping column (262) is fixed in the groove (261). A clamping protrusion (263) is integrally provided on the side wall of the pressing mesh cover (26) which is away from the central axis of the pressing mesh cover (26). The other ends of the plurality of clamping columns (262) pass through the support ring (23). The clamping protrusion (263) clamps and fixes the pressing mesh cover (26) on the support ring (23).

6. The pressure relief valve mechanism capable of replenishing air as claimed in claim 1, characterized in that: The pressure relief base fastening screw ring (15) comprises a fastening screw ring body (151), and a top pressure ring (152) is integrally provided on the outer edge of one end of the fastening screw ring body (151) facing the connecting body (13) of the first connecting base (11), and a plurality of operating bosses (153) are distributed at equal intervals along the circumferential direction on the side of the top pressure ring (152) facing away from the connecting body (13) of the first connecting base (11), and each operating boss (153) is machined with a mounting card hole (154) along the axial direction.

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