Quick air supply mechanism

Abstract

The utility model discloses a quick air supply mechanism which comprises an air cylinder base assembly, an air supply air cylinder and a quick opening assembly are installed on the air cylinder base assembly, the air cylinder base assembly comprises an opening cabin with the top open, an air cylinder installation base is integrally arranged at the bottom end of the opening cabin, and a quick connection base is integrally arranged on the side wall of the opening cabin. A first through hole communicated with the gas cylinder mounting base is formed in the bottom of the opening cabin, and a second through hole communicated with the quick connecting base is formed in the side wall of the opening cabin; the air supply cylinder is installed in the air cylinder installation base, the quick opening assembly comprises a propelling body and an opening ejector pin which are arranged in the opening cabin and is used for opening the air supply cylinder, and the quick opening assembly is reasonable in structure, easy and convenient to assemble, high in stability, easy to operate and capable of quickly supplying air to the air bag for human respiration; the chemical oxygen respirator achieves suffocation feeling of a user during initial wearing of the chemical oxygen respirator, achieves gas exchange, improves oxygen concentration of the chemical oxygen respirator in the initial reaction stage, and provides safety guarantee for the user.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire-fighting equipment, relates to an air supplement mechanism, and particularly relates to a rapid air supplement mechanism. Background Art

[0002] A chemical oxygen breathing apparatus is a personal respiratory protection device made based on the principle of generating oxygen with chemical agents. During the entire use process, the breathing action is isolated from the outside world and is not harmed by any toxic, harmful gases or smoke in the outside world. Therefore, it is applicable to various environments with toxic, harmful gases and lack of oxygen. A chemical oxygen breathing apparatus generally consists of a face mask, a breathing mask, an oxygen generation canister, and an airbag.

[0003] Before the initial wearing of the chemical oxygen breathing apparatus, 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. In this state, the user's inhalation action cannot obtain usable gas from the airbag, thus unable to complete the breathing action, resulting in breath-holding and unable to activate the reaction of the chemical agents in the oxygen generation canister, and unable to realize the gas exchange between human breathing and the oxygen generation canister and the airbag.

[0004] The reaction of the chemical oxygen generation agent in the oxygen generation canister of the chemical oxygen breathing apparatus has a slight lag. It is necessary to first have gas (water vapor, carbon dioxide) enter and contact with the chemical oxygen generation agent to start the reaction. Therefore, before wearing, the user needs to blow gas into the oxygen generation canister three or more times from the sealing cover at the mouth and nose breathing place. The gas will react with the chemical oxygen generation agent when entering the oxygen generation canister. The gas that has undergone the initial reaction enters the airbag and can be used by the user for breathing after wearing. The gas source of the airbag completely depends on the reaction result of the chemical oxygen generation agent in the oxygen generation canister, and there is no other source method.

[0005] 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 blowing process. 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 steps omitted. Once this step is omitted, the suffocation feeling during the initial wearing cannot be avoided, which will bring great risks. Moreover, during the initial wearing, due to the fact that the reaction activity and oxygen generation efficiency of the oxygen generation agent both show a parabolic shape, the oxygen generation efficiency of the oxygen generation agent is slightly low and slightly lagging, and the effective oxygen content available for the user in the airbag will be relatively low. 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

[0006] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide a rapid air supplement mechanism, which can solve the technical problems that there is no gas available for the user to breathe in the airbag before wearing the existing chemical oxygen breathing apparatus, wasting the user's self-rescue time, affecting gas exchange, and hindering normal breathing.

[0007] To solve the above technical problems, the present utility model is implemented by adopting the following technical solutions:

[0008] A rapid air supplement mechanism, comprising a gas cylinder base assembly, on which a gas supplement cylinder and a rapid opening assembly are installed;

[0009] The gas cylinder base assembly includes an opening cabin with an open top. At the bottom end of the opening cabin, a gas cylinder installation base is integrally provided. On the side wall of the opening cabin, a rapid connection base is integrally provided. A first through hole communicating with the gas cylinder installation base is opened at the bottom of the opening cabin, and a second through hole communicating with the rapid connection base is opened on the side wall of the opening cabin;

[0010] The mouth of the gas supplement cylinder is integrally welded and sealed by a metal sealing sheet. The gas supplement cylinder is installed in the gas cylinder installation base, and the mouth of the gas supplement cylinder is coaxially arranged with the first through hole. The rapid opening assembly includes a propulsion body and an opening thimble arranged in the opening cabin. The bottom end of the propulsion body is fixedly connected to the top end of the opening thimble. The top end of the propulsion body is higher than the top end of the opening cabin, and the opening thimble is coaxially arranged with the first through hole.

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

[0012] A propulsion return spring is arranged in the opening cabin. The bottom of the propulsion return spring is in contact with the bottom surface of the opening cabin, and the top of the propulsion return spring supports on the lower end surface of the propulsion body. The lower end of the opening thimble passes through the propulsion return spring and extends into the first through hole. The second through hole is located on the side of the propulsion return spring.

[0013] An annular groove is formed on the propulsion body in the circumferential direction, and a propulsion sealing ring is arranged in the annular groove. The propulsion sealing ring is in contact with the inner wall of the opening cabin.

[0014] A gas cylinder sealing ring is arranged between the mouth of the gas supplement cylinder and the bottom end of the opening cabin.

[0015] The rapid opening assembly further includes a lever. The lever includes a horizontally arranged pressing arm and a vertically arranged driving arm. On the outer wall of the opening cabin, a pair of support plates symmetrically arranged with respect to the opening cabin are provided. A support hole is opened at the upper part of each of the pair of support plates. A lever rotating shaft is installed in the pair of support holes. The lever rotating shaft passes through the pressing arm and arranges the pressing arm above the propulsion body. One end of the pressing arm is fixedly connected to the top end of the driving arm, and the other end of the pressing arm is a circular arc-shaped pressing head. The bottom end of the pressing head is in contact with the top end of the propulsion body.

[0016] An annular placement groove is formed on the outer wall of the open end of the rapid connection base in the circumferential direction, and a disassembly and insertion sealing ring is arranged in the annular placement groove.

[0017] The bottom end of the driving arm is installed with a lever extension rope, and a pull ring is arranged at the movable end of the lever extension rope.

[0018] Compared with the prior art, the utility model has the following technical effects:-

[0019] (I) The utility model has reasonable structure, simple assembly, strong stability and easy operation. The airbag can be quickly filled with gas, so that it can quickly change from an empty and airless state to an inflated state. The gas filled in the airbag can be used by the user to perform gas exchange during the initial breathing of the chemical oxygen respirator, and provide a precondition for activating the oxygen-generating agent in the oxygen-generating tank to release oxygen. When the oxygen release efficiency of the newly activated agent is low, the air replenishing mechanism inflates the airbag for human breathing, thereby avoiding the risk of low oxygen concentration in the initial reaction period and providing safety protection for the user.

[0020] (II) The assembly method of the gas cylinder base assembly and the quick opening assembly in the utility model can quickly open the gas cylinder and ensure that the gas in the gas cylinder can completely enter the air bag, thereby avoiding the waste of effective gas in a dangerous environment for the user.

[0021] (III) The detachable structural design of the gas cylinder base assembly and the gas supplement cylinder in the utility model allows the user to replace the structure or only replace the gas supplement cylinder according to actual conditions during use, thereby providing the user with more and faster usage methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of embodiment 1 of the present utility model.

[0023] Figure 2 It is a sectional stereoscopic schematic diagram of embodiment 1 of the utility model.

[0024] Figure 3 It is a cross-sectional schematic diagram of embodiment 2 of the present utility model.

[0025] Figure 4 It is a cross-sectional stereoscopic schematic diagram of embodiment 2 of the present utility model.

[0026] Figure 5 It is a schematic diagram of the pressure relief base assembly of Example 2 of the utility model.

[0027] Figure 6 It is a schematic cross-sectional view of the pressure relief base assembly of Example 2 of the utility model.

[0028] Figure 7 It is a cross-sectional stereoscopic schematic diagram of the pressure relief base assembly of Example 2 of the present utility model.

[0029] Figure 8 It is a schematic cross-sectional view of the overall structure of Example 3 of the present utility model.

[0030] Figure 9 It is a stereoscopic diagram of the disassembly, insertion and fixing assembly of Example 3 of the utility model.

[0031] Figure 10 It is an exploded view of the overall structure of Embodiment 3 of the present utility model.

[0032] The meanings of the various reference numerals in the figure are as follows:

[0033] 1. Pressure relief base assembly, 2. Gas commutation and circulation assembly, 3. Airbag sealing cover, 4. Air supplement gas cylinder, 5. Gas cylinder base assembly, 6. Quick opening assembly, 7. Plug-in fixing assembly;

[0034] 11. First connection base, 12. Second connection base, 13. Connecting body, 14. Grid bars, 15. Pressure relief base fastening ring, 16. Pressure relief base sealing gasket ring, 17. Sealing cover gasket;

[0035] 111. Positioning strip-shaped hole;

[0036] 151. Fastening ring body, 152. Pressing ring, 153. Operation boss, 154. Installation card hole, 155. Limit card slot;

[0037] 21. Commutation sliding base, 22. Conical spring, 23. Support ring, 24. Connecting column, 25. One-way pressure relief umbrella piece, 26. Pressing mesh cover, 27. Sealing gasket ring;

[0038] 211. Fixing hole, 212. Pressure relief hole;

[0039] 251. Umbrella piece body, 252. Connecting rod, 253. Anti-detachment convex edge;

[0040] 261. Groove, 262. Clamping column, 263. Clamping protrusion;

[0041] 51. Opening cabin, 52. Gas cylinder installation base, 53. Quick connection base, 54. First through hole, 55. Second through hole, 56. Gas cylinder sealing ring, 57. Propulsion and reset spring, 58. Support plate, 59. Support hole;

[0042] 531. Annular card slot, 532. Annular placement groove, 533. Plug-in sealing ring;

[0043] 61. Propulsion body, 62. Opening ejector pin, 63. Lever;

[0044] 611. Annular groove, 612. Propulsion sealing ring;

[0045] 631. Pressing arm, 632. Driving arm, 633. Lever rotating shaft, 634. Pressing head, 635. Lever extension rope, 636. Pulling ring;

[0046] 71. Positioning protection cover, 72. Plug-in snap spring, 73. Plug-in button, 74. Anti-detachment rod;

[0047] 711. Mounting hole, 712. Strip-shaped hole, 713. Limit protrusion;

[0048] 721. Snap ring body, 722. Positioning rod.

[0049] The following further elaborates on the specific content of the present utility model in conjunction with embodiments. Specific embodiments

[0050] Following the above technical solutions, the specific embodiments of the present utility model are given below. 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.

[0051] In the present utility model, unless otherwise stated, orientation terms such as "upper", "lower", "left", "right", etc. generally refer to those defined based on the drawing plane in the corresponding drawings. "Inner" and "outer" refer to the inside and outside of the contour of the corresponding component, and "longitudinal", "transverse", and "vertical" refer to the directions marked in the drawings.

[0052] Embodiment 1:

[0053] This embodiment provides a rapid air replenishment mechanism, as Figures 1 to 2 shown, which includes a gas cylinder base assembly 5, on which a gas replenishment cylinder 4 and a rapid opening assembly 6 are installed;

[0054] 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 mounting base 52, and the side wall of the opening cabin 51 is integrally provided with a rapid connection base 53. A first through hole 54 communicating with the gas cylinder mounting base 52 is opened at the bottom of the opening cabin 51, and a second through hole 55 communicating with the rapid connection base 53 is opened on the side wall of the opening cabin 51;

[0055] The mouth of the gas replenishment cylinder 4 is integrally welded and sealed by a metal sealing sheet. The gas replenishment cylinder 4 is installed in the gas cylinder mounting base 52, and the mouth of the gas replenishment cylinder 4 is coaxially arranged with the first through hole 54. The rapid opening assembly 6 includes a propulsion body 61 and an 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 opening thimble 62. The top end of the propulsion body 61 is higher than the top end of the opening cabin 51, and the opening thimble 62 is coaxially arranged with the first through hole 54.

[0056] In this embodiment, the quick connection base 53 in the quick air replenishment mechanism is connected to the installation port on the airbag of the chemical oxygen breathing apparatus. The quick air replenishment mechanism can quickly fill the airbag with gas. Specifically, the end of the opening thimble 62 passes through the first through hole 54 to pierce the metal sealing piece at the mouth of the air replenishment gas cylinder 4 arranged in the gas cylinder installation base 52. The compressed air in the air replenishment gas cylinder 4 enters the opening chamber 51 through the first through hole 54, 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 at the initial stage of wearing the chemical oxygen breathing apparatus, and further activating the oxygen-generating agent in the oxygen-generating canister to release oxygen.

[0057] As a preferred solution of this embodiment, a propulsion return spring 57 is arranged in the opening chamber 51 of this embodiment. The bottom of the propulsion return spring 57 is in contact with the bottom surface of the opening chamber 51, and the top of the propulsion return spring 57 supports the lower end surface of the propulsion body 61. The lower end of the opening thimble 62 passes through the propulsion return spring 57 and extends into the first through hole 54. The propulsion return spring 57 can separate the opening thimble 62 from the mouth of the air replenishment gas cylinder 4. The second through hole 55 is located on the side of the propulsion return spring 57.

[0058] Furthermore, a circumferential annular groove 611 is formed on the propulsion body 61, and 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 chamber 51. The arrangement positions of the propulsion sealing ring 612 and the second through hole 55 ensure that the gas released from the air replenishment 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 chamber 51.

[0059] As a preferred solution of this embodiment, a gas cylinder sealing ring 56 is arranged between the mouth of the air replenishment gas cylinder 4 and the bottom end of the opening chamber 51 in this embodiment, preventing the compressed air in the air replenishment gas cylinder 4 from overflowing from the installation end of the gas cylinder installation base 52.

[0060] As a preferred solution of this embodiment, in this embodiment, the quick-opening component 6 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 provided 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 an arc-shaped 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. In an emergency state, it is not convenient to quickly press. The quick pressing can be realized through the lever 63, and then the air supplement gas cylinder 4 can be quickly opened.

[0061] As a preferred solution of this embodiment, in this embodiment, an annular placement groove 532 is circumferentially provided on the outer wall of the open end of the quick-connection base 53. A plugging and unplugging 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 and unplugging sealing ring 533 can improve the airtightness of the connection between the two and avoid gas leakage.

[0062] As a preferred solution of this embodiment, in this embodiment, a lever extension cord 635 is installed at the bottom end of the driving arm 632. A pull ring 636 is arranged at the movable end of the lever extension cord 635. In an emergency state, the user can operate the lever 63 only by pulling the lever extension cord 635.

[0063] Embodiment 2:

[0064] This embodiment provides a pressure relief valve mechanism capable of supplementing air, as Figures 3 to 7 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 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 an air inlet end;

[0065] The pressure relief base assembly 1 includes a first connection base 11 and a second connection base 12 which are coaxially arranged. 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 axially arranged 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;

[0066] 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;

[0067] 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;

[0068] The open end of the first connection base 1 is the air inlet end.

[0069] 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 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 causes the gas to flow only along the air supply path. After filling enough gas, 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 a gas discharge 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 and flow component 2 can move relative to the pressure relief base component 1 to change the air supply and gas discharge paths.Provide a sufficient and continuous oxygen source for users to improve the safety of use.

[0070] 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, preventing external gas from entering the airbag through the air release passage.

[0071] Furthermore, 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 supplement 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 is buckled 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 closely attached to 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.

[0072] 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 and installed 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 supplement device.

[0073] 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 circumferentially and equidistantly formed 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. An integrally formed clamping protrusion 263 is arranged 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. 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 connection column 24, and then enters the airbag through the through holes between the connection body 13 and the grid bars 14.

[0074] As a preferred solution of this embodiment, in this embodiment, the pressure relief base fastening ring 15 includes a fastening ring body 151. An end edge of the fastening ring body 151 facing the connection 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 connection body 13 of the first connection base 11. Combining with the pressure relief base 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 connection 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 card hole 154 is axially processed on each operation boss 153. Using a claw wrench or other tools to be stuck in the installation card hole 154 makes the assembly faster.

[0075] Embodiment 3:

[0076] This embodiment provides a pressure relief valve with a detachable and fast 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 assembly 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 fast air supplement mechanism. The pressure relief valve mechanism adopts the pressure relief valve mechanism in Embodiment 2, and the fast air supplement mechanism adopts the fast air supplement mechanism in Embodiment 1;

[0077] Specifically, the quick connection base 53 is inserted into the open end of the first connection base 11, and the end of the open end of the quick connection base 53 is in pressing contact with the end of the gas commutation and circulation assembly 2. The outer diameter of the quick connection base 53 matches the inner diameter of the first connection base 11.

[0078] 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 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 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. The quick air filling mechanism installed on the first connecting base 11 can quickly fill the airbag with compressed air in the air filling 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 to move in the direction of 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 communicated with the inside of the first connecting base 11 through the space between the support ring 23 and the connecting column 24, forming an air filling passage. Press the pushing body 61, and the end of the opening thimble 62 passes through the first through hole 54 to pierce the metal sealing piece at the bottle mouth of the air filling gas cylinder 4 disposed inside the gas cylinder mounting base 52. The compressed air in the air filling 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. Finally, it 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 filling passage. The gas cylinder sealing ring 56 prevents the compressed air in the air filling gas cylinder 4 from overflowing from the mounting end of the gas cylinder mounting base 52. After the compressed air in the air filling gas cylinder 4 is released completely, the quick air filling 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 filling mechanism are in a separated state. The reversing 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 bar 14 is internally connected to the second connecting base 12 to form a deflation passage. The excess gas in the airbag can enter the interior of the second connecting 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 connecting base 11, and finally be discharged from the open end of the first connecting base 11, achieving the purpose of deflating the airbag. The plug-in connection method between the quick connection base 53 and the first connecting base 11 can not only realize the quick disassembly and insertion of the quick air supply mechanism and the pressure relief valve mechanism, but also drive the gas commutation flow component 2 to move relative to the pressure relief base component 1, changing the air supply and deflation passages, providing a sufficient and continuous oxygen source for the user, and improving the use safety.

[0079] As a preferred solution of this embodiment, in order to improve the connection stability between the quick air supply mechanism and the pressure relief valve mechanism and prevent the quick air supply 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 connecting base 11. An insertion and extraction spring 72 is arranged inside the clamping protection cover 71. An installation hole 711 for the first connecting base to pass through is axially opened on the clamping protection cover 71. A strip-shaped hole 712 is opened 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;

[0080] The plug-in retaining spring 72 includes a retaining spring body 721 with an isosceles trapezoidal structure open at one end. The symmetric 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 hole 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 separated from the annular card slot 531.

[0081] Further, 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. A plug-in sealing ring 533 is arranged in the annular placement groove 532. The plug-in 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.

[0082] Further, 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.

[0083] As a preferred solution of this embodiment, in this embodiment, arc-shaped anti-detachment rods 74 are arranged on the two transverse 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.

[0084] During the actual operation of this embodiment:

[0085] Before use, the used air replenishing gas cylinder 4 needs to be removed first, and a new air replenishing gas cylinder 4 is installed on the gas cylinder installation base 52 and placed properly for use in case of emergency.

[0086] When it is necessary to use the chemical oxygen respirator in case of emergency, the user holds the air replenishing 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 metal sealing piece at the bottle mouth of the air replenishing gas cylinder 4 through the first through hole 54, and the compressed air in the air replenishing gas cylinder 4 enters the airbag through the air replenishing passage to supply oxygen to the user. After the compressed air in the air replenishing 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 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 tank 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 tank 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 replenishing gas cylinder 4 can be reassembled into the gas cylinder installation base 52 to repeat the previous installation process or reinstall the quick air replenishing mechanism equipped with a new air replenishing gas cylinder 4 to provide continuous oxygen for the user.

Claims

1. A rapid air replenishment mechanism, characterized in that: It comprises a gas cylinder base assembly (5), on which a gas replenishing gas cylinder (4) and a quick opening assembly (6) are mounted; The gas cylinder base assembly (5) comprises an opening cabin (51) with an open top, a gas cylinder mounting base (52) is integrally arranged at the bottom end of the opening cabin (51), a quick connection base (53) is integrally arranged on the side wall of the opening cabin (51), a first through hole (54) connected to the gas cylinder mounting base (52) is formed at the bottom of the opening cabin (51), and a second through hole (55) connected to the quick connection base (53) is formed on the side wall of the opening cabin (51); The mouth of the gas replenishing cylinder (4) is sealed by integral welding of a metal sealing sheet. The gas replenishing cylinder (4) is installed in the cylinder mounting base (52). The mouth of the gas replenishing cylinder (4) is coaxially arranged with the first through hole (54). The quick opening component (6) comprises a propulsion body (61) and an opening ejector pin (62) arranged in the opening chamber (51). The bottom end of the propulsion body (61) is fixedly connected with the top end of the opening ejector pin (62). The top end of the propulsion body (61) is higher than the top end of the opening chamber (51). The opening ejector pin (62) is coaxially arranged with the first through hole (54).

2. The rapid air replenishment mechanism according to claim 1, characterized in that: A propulsion return spring (57) is arranged in the opening chamber (51), the bottom of the propulsion return spring (57) contacts the bottom surface of the opening chamber (51), the top of the propulsion return spring (57) is supported on the lower end surface of the propulsion body (61), the lower end of the opening ejector pin (62) passes through the propulsion return spring (57) and extends into the first through hole (54), and the second through hole (55) is located on the side of the propulsion return spring (57).

3. The rapid air replenishment mechanism according to claim 1, characterized in that: An annular groove (611) is provided on the propulsion body (61) along the circumferential direction, and a propulsion sealing ring (612) is provided in the annular groove (611). The propulsion sealing ring (612) contacts the inner wall of the opening chamber (51).

4. The rapid air replenishment mechanism according to claim 1, characterized in that: A gas cylinder sealing ring (56) is provided between the bottle mouth of the gas replenishing cylinder (4) and the bottom end of the opening cabin (51).

5. The rapid air replenishment mechanism according to claim 1, characterized in that: The quick opening assembly (6) further comprises a lever (63), the lever (63) comprising a horizontally arranged pressing arm (631) and a vertically arranged driving arm (632), a pair of support plates (58) symmetrically arranged relative to the opening chamber are arranged on the outer wall of the opening chamber (51), a support hole (59) is provided on the upper part of the pair of support plates (58), a lever shaft (633) is installed in the pair of support holes (59), the lever 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-shaped pressing head (634), the bottom end of the pressing head (634) is in contact with the top end of the propulsion body (61).

6. The rapid air replenishment mechanism according to claim 1, characterized in that: An outer wall of the open end of the quick connection base (53) is provided with an annular placement groove (532) along the circumferential direction, and a removal and insertion sealing ring (533) is arranged in the annular placement groove (532).

7. The rapid air replenishment mechanism according to claim 5, characterized in that: A lever extension rope (635) is installed at the bottom end of the driving arm (632), and a pull ring (636) is arranged at the movable end of the lever extension rope (635).

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