Pressure release valve with detachable and replaceable quick air supply mechanism

Abstract

The pressure release valve comprises a pressure release valve mechanism and the quick air supply mechanism which are connected with each other, the pressure release valve mechanism comprises a pressure release base assembly, and a gas reversing circulation assembly capable of assisting in switching air supply and pressure release channels is installed in the pressure release base assembly. The rapid air supplementing mechanism comprises an air bottle base assembly, an air supplementing air bottle and a rapid opening assembly are installed on the air bottle base assembly, one end of a pressure relief base assembly is connected with an air bag sealing cover, the other end of the pressure relief base assembly is connected with the air bottle base assembly through a dismounting and inserting fixing assembly, and the rapid opening assembly is used for opening the air supplementing air bottle. The chemical oxygen respirator is reasonable in structure, easy and convenient to assemble, high in stability, easy to operate and capable of rapidly supplementing air for the air bag for human body breathing, achieves suffocation feeling of a user due to initial wearing of the chemical oxygen respirator, achieves air exchange, prevents external complex air from entering a closed air circulation channel, improves oxygen concentration of the chemical oxygen respirator in the initial reaction stage, and improves the safety of the user. And a safety guarantee is provided for a user.

Description

Technical Field

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

[0002] A chemical oxygen respirator 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 and smoke 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 generation canister, and an airbag. As the gas generated by the oxygen generation 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 is installed on the airbag to reduce the air pressure.

[0003] Before the chemical oxygen respirator is initially worn, 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 available gas from the airbag, thus unable to complete the breathing action, resulting in breath-holding and the inability to activate the reaction of the chemical agents in the oxygen generation canister, and unable to achieve the gas exchange between human breathing and the oxygen generation canister and the airbag.

[0004] The reaction of the oxygen generation agent in the oxygen generation canister of the chemical oxygen respirator has a slight lag. It is necessary to first have gas (water vapor, carbon dioxide) enter and contact with the oxygen generation agent to start the reaction. 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 oxygen generation agent when entering the oxygen generation canister. The gas that has undergone the initial reaction enters the airbag for the user to breathe after wearing. The gas source of the airbag completely depends on the reaction result of the 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 every 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, during the initial wearing, 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 low. There may also be a short-term stuffy feeling in the early stage (20 - 60 seconds, varying from person to person), causing discomfort to the human body. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technologies, the purpose of the present utility model is to provide a pressure relief valve with a detachable and quickly replenishing air mechanism, which can solve the technical problems that the existing chemical oxygen respirators cannot form a closed-loop gas exchange in the initial stage of wearing and using, it takes time to blow in gas to activate the chemical agent reaction to promote the formation of a closed-loop gas exchange passage, consuming the self-rescue time of users, and due to improper use, the airbag discharges oxygen gas due to external force, affecting gas exchange and hindering normal breathing.

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

[0008] A pressure relief valve with a detachable and quickly replenishing air mechanism, including a pressure relief valve mechanism. The pressure relief valve mechanism includes a pressure relief base assembly. A gas commutation and circulation assembly that can move axially along the pressure relief base assembly is installed in the pressure relief base assembly. 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 connected with a quickly replenishing air mechanism;

[0009] The pressure relief base assembly includes a first connection base and a second connection base arranged coaxially. Circular connecting bodies are provided on the outer edges of the opposite ends of the first connection base and the second connection base. Multiple equally spaced grid bars are arranged along the axial direction on the inner wall of the second connection base. The ends of the multiple grid bars extend out of one end of the second connection base and are fixedly connected with the connecting body of the first connection base;

[0010] 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 connecting body of the first connection base. The airbag sealing cover is installed on the second connection base. A sealing cover gasket is arranged between the airbag sealing cover and the connecting body of the second connection base;

[0011] 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 multiple 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 connecting body of the first connection base. The support ring is arranged in the first connection base;

[0012] The quickly replenishing air mechanism includes a replenishing air cylinder, a cylinder base assembly and a quickly opening assembly. The cylinder base assembly includes an opening cabin with an open top. A cylinder installation base is integrally arranged at the bottom end of the opening cabin. A quickly connecting base is integrally arranged on the side wall of the opening cabin. A first through hole communicating with the cylinder installation base is opened at the bottom of the opening cabin. A second through hole communicating with the quickly connecting base is opened on the side wall of the opening cabin;

[0013] The air supplement gas cylinder is installed inside the gas cylinder installation base. The bottle mouth of the air supplement gas cylinder is coaxially arranged with the first through hole. The bottle mouth of the air supplement gas cylinder is integrally welded and sealed by a metal sealing sheet. A gas cylinder sealing ring is arranged between the bottle mouth of the air supplement gas cylinder and the bottom end of the opening cabin; the quick opening assembly includes a propulsion body and an opening ejector pin arranged inside the opening cabin. The bottom end of the propulsion body is fixedly connected to the top end of the opening ejector pin. The top end of the propulsion body is higher than the top end of the opening cabin. The opening ejector pin is coaxially arranged with the first through hole. The quick connection base is inserted into the first connection base, and the end of the open end of the quick connection base is in pressing contact with the end of the gas commutation and circulation assembly.

[0014] The utility model further includes the following technical features:

[0015] A fixing hole is axially opened in the middle of the commutation sliding base. A plurality of pressure relief holes are equidistantly arranged 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;

[0016] A sealing gasket ring is arranged between the connecting body of the commutation sliding base and the first connection base. The sealing gasket ring is fixedly installed on the commutation sliding base.

[0017] A circular pressing net cover is covered on the support ring. The pressing net cover is coaxially arranged with the support ring and 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 arranged along the circumference 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. 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. The clamping protrusion clamps and fixes the pressing net cover on the support ring. The end of the open end of the quick connection base is in pressing contact with the end face of the pressing net cover.

[0018] A propulsion return spring is arranged inside the opening cabin. The lower end face of the propulsion body is in contact with the top of the propulsion return spring. The lower end of the opening ejector pin passes through the propulsion return spring and extends into the first through hole. The second through hole is located on one side of the propulsion return spring; an annular groove is axially opened on the propulsion body. 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.

[0019] The described quick-opening component further includes a lever. The lever includes a horizontally arranged pressing arm and a vertically arranged driving arm. A pair of support plates symmetrically arranged with respect to the opening compartment are provided on the outer wall of the opening compartment. A support hole is provided 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. The other end of the pressing arm is a circular-arc pressing head, and the bottom end of the pressing head is in contact with the top end of the propulsion body.

[0020] It further includes a plug-and-unplug fixing component. The plug-and-unplug fixing component includes a clamping-position protection cover sleeved on the first connection base. A plug-and-unplug spring is arranged inside the clamping-position protection cover. An installation hole for the first connection base to pass through is axially provided on the clamping-position protection cover. A strip-shaped hole is provided on the side wall of the clamping-position protection cover, and a hollow and open-ended plug-and-unplug button is installed in the strip-shaped hole.

[0021] The described plug-and-unplug spring includes a spring body with an isosceles trapezoid structure with one end open. A protruding clamping-position rod is integrally connected to each of the two free ends of the spring body. The protruding parts of the pair of clamping-position rods face each other. The closed end of the spring body passes through the strip-shaped hole and is installed in the plug-and-unplug button.

[0022] A pair of symmetrically arranged clamping-position strip-shaped holes are circumferentially provided on the side wall of the first connection base. An annular clamping groove is circumferentially provided on the outer wall of the quick connection base. The protruding parts of the pair of clamping-position rods respectively pass through the corresponding clamping-position strip-shaped holes in their corresponding directions and extend into the first connection base to be clamped in the annular clamping groove.

[0023] An annular placement groove parallel to the annular clamping groove is provided on the outer wall of the open end of the quick connection base. An insertion and extraction sealing ring is arranged in the annular placement groove, and the insertion and extraction sealing ring is in contact with the inner wall of the first connection base.

[0024] The described pressure relief base fastening ring includes a fastening ring body. An outer edge of one end of the fastening ring body facing the connection body of the first connection base is integrally provided with a pressing ring. A plurality of operation bosses are circumferentially and equally spaced on the side of the pressing ring facing away from the connection body of the first connection base. An installation hole is axially processed on each operation boss.

[0025] A pair of limit clamping grooves are processed on the outer edge of the pressing ring. A pair of limit protrusions are provided on the inner wall of the open end of the clamping-position protection cover. The pair of limit protrusions are respectively installed in the corresponding limit clamping grooves.

[0026] An anti-disengagement rod is provided on the side wall of the open end of the plug-and-unplug button. The anti-disengagement rod passes through the strip-shaped hole and is in contact with the inner side wall of the clamping-position protection cover.

[0027] A pull rod extension rope is installed at the bottom end of the driving arm, and a pull ring is arranged at the movable end of the pull rod extension rope.

[0028] Compared with the prior art, the utility model has the following technical effects: -

[0029] (Ⅰ) By installing a quick air replenishing mechanism on the pressure relief valve mechanism, the utility model enables the airbag to quickly change from a deflated and airless state to an inflated state. The gas filled into the airbag can be used by the user for gas exchange during the initial stage of wearing a chemical oxygen respirator, providing a prerequisite for activating the oxygen generating agent in the oxygen generating canister to release oxygen. At the same time, the oxygen release efficiency of the just-activated agent is relatively low. The air replenishing mechanism inflates the airbag for human breathing, avoiding the risk of low oxygen concentration at the initial stage of the reaction and providing safety protection for the user. The device has a reasonable structure, is easy to assemble, has strong stability, is easy to operate, and can realize the quick insertion and removal of the quick air replenishing mechanism and the pressure relief valve mechanism through the plug-in connection mode of the quick connection base and the first connection base, winning time for the user. It can also drive the gas commutation and circulation component to move relative to the pressure relief base component, changing the air replenishing and air discharging passages, providing a sufficient and continuous oxygen source for the user and improving the use safety.

[0030] (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 overall device to realize the one-way flow of gas in both the air replenishing and pressure relief states.

[0031] (Ⅲ) The assembly mode of the gas cylinder base component and the quick opening component in the utility model can quickly open the air replenishing gas cylinder and ensure that the gas in the air replenishing gas cylinder can completely enter the airbag, avoiding the waste of effective gas for the user in a dangerous environment.

[0032] (Ⅳ) The plug-in and fixing component in the utility model further improves the connection stability between the quick air replenishing mechanism and the pressure relief valve mechanism, avoiding the occurrence of the situation that the quick air replenishing mechanism falls off from the pressure relief valve mechanism due to the movement of the user during the air replenishing process.

[0033] (Ⅴ) The detachable structural design of the quick air replenishing mechanism in the utility model can replace the quick air replenishing mechanism or only replace the air replenishing gas cylinder according to the actual situation during use, providing more and faster use methods for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic cross-sectional view of the overall structure of the utility model.

[0035] Figure 2 is a schematic cross-sectional view of the pressure relief valve mechanism of the utility model.

[0036] Figure 3It is a sectional perspective schematic diagram of the pressure relief valve mechanism of the present utility model.

[0037] Figure 4 It is a sectional schematic diagram of the rapid air replenishment mechanism of the present utility model.

[0038] Figure 5 It is a sectional perspective schematic diagram of the rapid air replenishment mechanism of the present utility model.

[0039] Figure 6 It is an exploded view of the overall structure of the present utility model.

[0040] Figure 7 It is a schematic diagram of the pressure relief base assembly of the present utility model.

[0041] Figure 8 It is a sectional schematic diagram of the pressure relief base assembly of the present utility model.

[0042] Figure 9 It is a sectional perspective schematic diagram of the pressure relief base assembly of the present utility model.

[0043] Figure 10 It is a perspective view of the plug-in and fixed assembly of the present utility model.

[0044] The meanings of the various labels in the figure are as follows:

[0045] 1. Pressure relief base assembly, 2. Gas commutation and flow-through assembly, 3. Airbag sealing cover, 4. Air replenishment gas cylinder, 5. Gas cylinder base assembly, 6. Quick opening assembly, 7. Plug-in and fixed assembly;

[0046] 11. First connection base, 12. Second connection base, 13. Connection body, 14. Grid bars, 15. Pressure relief base fastening ring, 16. Pressure relief base sealing gasket ring, 17. Sealing cover gasket;

[0047] 111. Positioning strip-shaped hole;

[0048] 151. Fastening ring body, 152. Pressing ring, 153. Operation boss, 154. Installation card hole, 155. Limit card slot;

[0049] 21. Commutation sliding base, 22. Conical spring, 23. Support ring, 24. Connection column, 25. One-way pressure relief umbrella piece, 26. Pressing mesh cover, 27. Sealing gasket ring;

[0050] 211. Fixed hole, 212. Pressure relief hole;

[0051] 251. Umbrella piece body, 252. Connecting rod, 253. Anti-detachment convex edge;

[0052] 261. Groove, 262. Clamping column, 263. Clamping protrusion;

[0053] 51. Opening chamber, 52. Gas cylinder mounting base, 53. Quick connection base, 54. First through hole, 55. Second through hole, 56. Gas cylinder sealing ring, 57. Propulsion return spring, 58. Support plate, 59. Support hole;

[0054] 531. Annular clamping groove, 532. Annular placement groove, 533. Insertion and removal sealing ring;

[0055] 61. Propulsion body, 62. Opening ejector pin, 63. Lever;

[0056] 611. Annular groove, 612. Propulsion sealing ring;

[0057] 631. Pressing arm, 632. Driving arm, 633. Lever rotating shaft, 634. Pressing head, 635. Lever extension rope, 636. Pulling ring;

[0058] 71. Positioning protection cover, 72. Insertion and removal snap spring, 73. Insertion and removal button, 74. Anti - detachment rod;

[0059] 711. Mounting hole, 712. Strip - shaped hole, 713. Limiting protrusion;

[0060] 721. Snap spring body, 722. Positioning rod.

[0061] The following further elaborates on the specific content of the present utility model in conjunction with embodiments. Specific embodiments

[0062] Complying with the above - mentioned technical solutions, the following specific embodiments of the present utility model are given. 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.

[0063] In the present utility model, unless otherwise stated, orientation terms such as "upper", "lower", "left", "right", etc. usually refer to those defined based on the drawing surface of the corresponding drawings, and "inner" and "outer" refer to the inside and outside of the contour of the corresponding components.

[0064] Embodiment:

[0065] This embodiment provides a pressure relief valve with a quick air - replenishing 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, in which a gas commutation and circulation assembly 2 that can move axially along the pressure relief base assembly 1 is installed. 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 - replenishing mechanism;

[0066] 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. Along the axial direction, multiple equally spaced grid bars 14 are provided on the inner wall of the second connection base 12. The ends of the multiple 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;

[0067] A pressure relief base fastening ring 15 is installed on the first connection base 11. A pressure relief base gasket ring 16 is provided 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 provided between the airbag sealing cover 3 and the connection body 13 of the second connection base 12;

[0068] The gas commutation and flow component 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 provided 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 multiple connecting columns 24. A one-way pressure relief umbrella piece 25 is installed on the commutation sliding base 21 inside the connecting columns 24. The commutation sliding base 21 outside the connecting 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;

[0069] The rapid air replenishment mechanism includes an air replenishment gas cylinder 4, a gas cylinder base assembly 5, and a rapid opening assembly 6. The gas cylinder base assembly 5 includes an opening cabin 51 with an open top. A gas cylinder installation base 52 is integrally provided at the bottom end of the opening cabin 51. A rapid 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 rapid connection base 53 is opened on the side wall of the opening cabin 51;

[0070] The air replenishment gas cylinder 4 is installed in the gas cylinder installation base 52. The bottle mouth of the air replenishment gas cylinder 4 is coaxially arranged with the first through hole 54. The bottle mouth of the air replenishment gas cylinder 4 is integrally welded and sealed by a metal sealing sheet. A gas cylinder sealing ring 56 is provided between the bottle mouth of the air replenishment gas cylinder 4 and the bottom end of the opening cabin 51; The rapid opening assembly 6 includes a propulsion body 61 and an opening ejector pin 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 ejector pin 62. The top end of the propulsion body 61 is higher than the top end of the opening cabin 51. The opening ejector pin 62 is coaxially arranged with the first through hole 54. The rapid connection base 53 is inserted into the first connection base 11 and the end of the open end of the rapid connection base 53 is in pressing contact with the end of the gas commutation and flow component 2. The outer diameter of the rapid connection base 53 matches the inner diameter of the first connection base 11.

[0071] 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 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 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 communicated with the inside of the first connecting base 11 through the space between the support ring 23 and the connecting column 24 to form 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 in 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, 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 according to 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, 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 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 bar 14 is internally connected to the second connecting base 12 to form a pressure relief 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 into the interior of the first connecting base 11 through the one-way pressure relief umbrella piece 25 on the reversing sliding base 21, and finally be discharged from the open end of the first connecting base 11 to achieve the purpose of airbag pressure relief. The plug-in connection method between the quick connection base 53 and the first connecting base 11 can realize the quick insertion and removal of the quick air supply mechanism and the pressure relief valve mechanism, and can also drive the gas reversing flow component 2 to move relative to the pressure relief base component 1 to change the air supply and pressure relief passages, providing a sufficient and continuous oxygen source for the user and improving the use safety.

[0072] As a preferred solution of this embodiment, a fixing hole 211 is axially formed in the middle of the reversing 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 reversing 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 reversing 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, and the distance between the anti-detachment convex edge 253 and the umbrella piece body 251 is slightly greater than the length of the fixing hole 211 to ensure that the one-way pressure relief umbrella piece 25 can have a small floating displacement relative to the reversing sliding base 21;

[0073] A sealing gasket ring 27 is arranged between the reversing sliding base 21 and the connecting body 13 of the first connecting base 11. The sealing gasket ring 27 is fixedly installed on the reversing sliding base 21. When the device is in the air supply state, the sealing gasket ring 27 is separated from the connecting body 13 of the first connecting base 11, and the umbrella piece body 251 buckles on the reversing sliding base 21 and can completely cover the plurality of pressure relief holes 252. The gas entering the pressure relief base component 1 cannot enter the second connecting base 12 through the reversing sliding base 21 and can only enter the airbag through the through hole between the connecting body 13 and the grid bar 14. When the device is in the pressure relief state, the sealing gasket ring 27 is closely attached to the connecting body 13 of the first connecting base 11, blocking the direct connection between the through hole between the connecting body 13 and the grid bar 14 and the first connecting base 11 in the circumferential direction. The gas in the airbag only enters the second connecting base 12 through the through hole between the connecting body 13 and the grid bar 14. The gas pressure in the second connecting base 12 pushes up the umbrella piece body 251, and the gas flows into the first connecting base 11 through the plurality of pressure relief holes 252.

[0074] As a preferred solution of this embodiment, in this embodiment, a circular pressing mesh cover 26 is covered on the support ring 23. The pressing mesh cover 26 is coaxially arranged with the support ring 23 and the diameter of the pressing mesh cover 26 is larger than the inner diameter of the support ring 23. The end of the open end of the quick-connection base 53 is in pressing contact with the end face of the pressing mesh cover 26. The pressing mesh cover 26 increases the pressing contact surface. Regardless of the size of the end opening diameter of the quick-connection base 53, it can ensure that the quick-connection base 53 effectively applies force to the gas commutation and flow component 2. A plurality of axially arranged grooves 261 are circumferentially and equally spaced 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 arranged. 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 to ensure the stability of the pressing mesh cover 26 relative to the support ring 23. In the air supplement state, the gas entering from the quick-connection base 53 enters the space between the support ring 23 and the connecting column 24 through the mesh holes on the pressing mesh cover 26, and then enters the airbag through the through holes between the connecting body 13 and the grid bars 14.

[0075] As a preferred solution of this embodiment, in this embodiment, a propulsion return spring 57 is arranged in the opening cabin 51. The lower end face of the propulsion body 61 is in contact with the top of the propulsion return spring 57. 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 realize the separation between the opening thimble 62 and the bottle mouth of the air supplement gas cylinder 4. The second through hole 55 is located on one side of the propulsion return spring 57. An annular groove 611 is circumferentially arranged 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.

[0076] 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 compartment are provided on the outer wall of the opening compartment 51. A support hole 59 is provided in 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 press can be realized through the lever 63, and thus the air supplement gas cylinder 4 can be quickly opened.

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

[0078] The plug-in snap spring 72 includes a snap spring body 721 with an isosceles trapezoidal structure that is open at one end. The symmetric sides of the snap spring body 721 are stepped. A convex positioning rod 722 is integrally connected to each of the two free ends of the snap spring body 721. In this embodiment, the convex part is trapezoidal. The convex 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 snap 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 groove 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 groove 531 corresponds to the positioning strip-shaped hole 111. The snap spring body 721 is arranged on one side of the first connection base 11. The distance between the two free ends of the snap 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 groove 531, fixing 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 snap 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 groove 531.

[0079] Further, in this embodiment, an annular placement groove 532 parallel to the annular groove 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] 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 connecting 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 connecting base 11. Combined with the pressure relief base gasket ring 16, the airtightness between the first connecting 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 connecting base 11. During the production and assembly process, the operation bosses 153 can increase the operation contact surface, facilitating the screwing and assembling of the fastening ring body 151 onto the first connecting base 11. Further, an installation card hole 154 is axially processed on each operation boss 153. A claw wrench or other tool is used to be stuck in the installation card hole 154 to make the assembly faster.

[0081] Further, an outer edge of the pressing ring 152 facing the pressure relief base fastening ring 15 is processed with a pair of circumferentially arranged limiting slots 155. On the inner wall of the open end of the clamping position protection cover 71, a pair of limiting protrusions 713 are circumferentially arranged. The pair of limiting protrusions 713 are respectively installed in the corresponding limiting slots 155 to improve the installation stability of the clamping position protection cover 71.

[0082] As a preferred solution of this embodiment, on the two lateral sidewalls of the open end of the plugging and unplugging button 73 in this embodiment, arc-shaped anti-detachment rods 74 are provided. The anti-detachment rods 74 pass through the strip-shaped holes 712 and are in contact with the arc-shaped inner sidewall of the clamping position protection cover 71 to prevent the plugging and unplugging button 73 from falling off from the strip-shaped holes 712.

[0083] 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 provided at the movable end of the lever extension rope 635. In an emergency state, the user can operate the lever 63 only by pulling the lever extension rope 635.

[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 an emergency.

[0086] When it is necessary to use a chemical oxygen breathing apparatus in an emergency, the user holds the air replenishment gas cylinder 4, inserts the quick connection base 53 into the first connection base 11, fixes and installs the quick connection base 53 on the first connection base 11, wears the chemical oxygen breathing apparatus well, pulls up the lever extension cord 635, drives the driving arm 632 to move upward, the driving arm 632 drives the pressing head 634 to press down on the pushing body 61, the ejector pin 62 is driven to move downward with the pushing body 61, passes through the first through hole 54 to pierce the metal sealing piece at the bottle mouth of the air replenishment gas cylinder 4, and the compressed air in the air replenishment gas cylinder 4 enters the airbag through the air replenishment passage to supply oxygen to the user. After the compressed air in the air replenishment gas cylinder 4 is delivered, press the disassembly and insertion button 73, the disassembly and insertion spring clip 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 the user 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 breathing apparatus will be stored in the airbag. When reaching the reaction peak of the oxygen generating agent, there may be a situation where the oxygen generation 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 breathing apparatus, 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 replenishment gas cylinder 4 can be reassembled into the gas cylinder installation base 52 to repeat the previous installation process or reinstall the quick air replenishment mechanism equipped with a new air replenishment gas cylinder 4 to provide continuous oxygen for the user.

Claims

1. A pressure relief valve with a detachable quick air replenishment mechanism, characterized in that: The pressure relief valve mechanism comprises a pressure relief base assembly (1), a gas reversing circulation assembly (2) which can move axially along the pressure relief base assembly (1) is installed in the pressure relief base assembly (1), an air bag sealing cover (3) is connected to one end of the pressure relief base assembly (1), and a quick air replenishment mechanism is connected to the other end of the pressure relief base assembly (1); 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 rapid gas replenishment mechanism comprises a gas replenishment cylinder (4), a cylinder base assembly (5) and a rapid opening assembly (6), wherein the cylinder base assembly (5) comprises an opening cabin (51) with an open top, a cylinder mounting base (52) is integrally arranged at the bottom of the opening cabin (51), a rapid connection base (53) is integrally arranged on the side wall of the opening cabin (51), a first through hole (54) connected to the cylinder mounting base (52) is formed at the bottom of the opening cabin (51), and a second through hole (55) connected to the rapid connection base (53) is formed on the side wall of the opening cabin (51); The gas replenishing cylinder (4) is installed in the gas cylinder installation base (52), the bottle mouth of the gas replenishing cylinder (4) is coaxially arranged with the first through hole (54), the bottle mouth of the gas replenishing cylinder (4) is welded and sealed by a metal sealing sheet, and a gas cylinder sealing ring (56) is arranged between the bottle mouth of the gas replenishing cylinder (4) and the bottom end of the opening chamber (51); 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), the quick connection base (53) is inserted into the first connection base (11), and the end of the opening end of the quick connection base (53) is pressed and contacted with the end of the gas reversing circulation component (2).

2. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 1, characterized in that: The middle part of the reversing sliding base (21) is provided with a fixing hole (211) in the axial direction, and the reversing sliding base (21) is provided with a plurality of pressure relief holes (212) at equal intervals 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 connecting rod (252) is fixedly connected to the inner center of the umbrella piece body (251). 2) 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-dropping convex edge (253) is arranged on the connecting rod (252) along the circumferential direction, and the anti-dropping convex edge (253) and the umbrella piece body (251) are respectively arranged on both sides of the fixing hole (211), and the umbrella piece body (251) completely covers the plurality of pressure relief holes (212); 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).

3. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 1, characterized in that: 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), and the diameter of the pressing mesh cover (26) is larger than the inner diameter of the support ring (23), and a plurality of axially arranged grooves (261) are provided at equal intervals along the circumferential direction on the outer wall of the pressing mesh cover (26), and a clamping column (262) is provided in each of the grooves (261), and one end of the clamping column (262) is fixed to the groove. In the groove (261), a clamping protrusion (263) is integrally provided on the side wall of the other end of the clamping column (262) facing away from the central axis of the pressing mesh cover (26), and 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), and the end of the opening end of the quick connection base (53) is in pressing contact with the end surface of the pressing mesh cover (26).

4. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 1, characterized in that: The opening chamber (51) is provided with a propulsion return spring (57), the lower end surface of the propulsion body (61) is in contact with the top of the propulsion return spring (57), 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 one side of the propulsion return spring (57); an annular groove (611) is provided on the propulsion body (61) in the circumferential direction, a propulsion sealing ring (612) is provided in the annular groove (611), and the propulsion sealing ring (612) is in contact with the inner wall of the opening chamber (51).

5. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in 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 pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 1, characterized in that: It also includes a plug-in and disassembly fixing assembly (7), the plug-in and disassembly fixing assembly (7) including a locking protective cover (71) mounted on the first connection base (11), a plug-in and disassembly clamping spring (72) being arranged in the locking protective cover (71), a mounting hole (711) being provided in the axial direction on the locking protective cover (71) for the first connection base (11) to pass through, a strip hole (712) being provided on the side wall of the locking protective cover (71), and a hollow plug-in and disassembly button (73) being open at one end being arranged in the strip hole (712); The insertion and removal clamping spring (72) comprises a clamping spring body (721) of an isosceles trapezoidal structure with one end open, the two free ends of the clamping spring body (721) are integrally connected with a raised locking rod (722), the raised parts of a pair of the locking rods (722) are arranged facing each other, and the closed end of the clamping spring body (721) passes through the strip-shaped hole (712) and is installed in the insertion and removal button (73); A pair of symmetrically arranged locking strip holes (111) are provided on the side wall of the first connection base (11) along the circumferential direction, and an annular locking groove (531) is provided on the outer wall of the quick connection base (53) along the circumferential direction. The protrusions of a pair of locking rods (722) respectively pass through the locking strip holes (111) in corresponding directions and extend into the first connection base (11) to be locked in the annular locking groove (531).

7. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 6, characterized in that: The outer wall of the open end of the quick connection base (53) is provided with an annular placement groove (532) arranged parallel to the annular clamping groove (531), and a removal and insertion sealing ring (533) is arranged in the annular placement groove (532), and the removal and insertion sealing ring (533) is in contact with the inner wall of the first connection base (11).

8. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 6, characterized in that: The pressure relief base fastening screw ring (15) comprises a fastening screw ring body (151), an outer edge of one end of the fastening screw ring body (151) facing the connecting body (13) of the first connecting base (11) is integrally provided with a top pressure ring (152), and a side surface of the top pressure ring (152) facing away from the connecting body (13) of the first connecting base (11) is provided with a plurality of operating bosses (153) distributed at equal intervals along the circumferential direction, and each operating boss (153) is processed with an installation card hole (154) along the axial direction; A pair of limiting grooves (155) are processed on the outer edge of the top pressure ring (152), and a pair of limiting protrusions (713) are arranged on the inner wall of the opening end of the positioning protection cover (71), and the pair of limiting protrusions (713) are respectively installed in the corresponding limiting grooves (155).

9. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in claim 6, characterized in that: An anti-drop rod (74) is arranged on the side wall of the open end of the insertion and removal button (73), and the anti-drop rod (74) passes through the strip-shaped hole (712) and contacts the inner side wall of the locking protection cover (71).

10. The pressure relief valve with a detachable quick air replenishment mechanism as claimed in 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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