Chemical oxygen generator and assembly method

Abstract

The application discloses a chemical oxygen generator and an assembling method. The oxygen generator comprises a firing mechanism assembly, a zirconium-containing blanket, an oxygen-producing medicine core assembly, a shell, a purification material assembly, heat insulation material and an air outlet end. The firing mechanism assembly and the air outlet end are respectively sealed and fixed to the upper and lower ends of the shell. The oxygen-producing medicine core is fixed in the shell through the heat insulation material and the zirconium-containing blanket. The purification material assembly is arranged in the cavity between the bottom of the oxygen-producing medicine core and the air outlet end. The firing mechanism of the firing mechanism assembly is in contact with the oxygen-producing medicine core assembly after penetrating through the zirconium-containing blanket. The firing mechanism is started by low voltage and then causes the oxygen-producing medicine core to produce oxygen. The purification material assembly adsorbs impurities in the oxygen gas produced by the oxygen-producing medicine core and provides an air passage. The air outlet end is used for limiting the axial movement of the oxygen-producing medicine core assembly, the heat insulation material and the purification material assembly in the shell and providing an air outlet passage for the purified oxygen. The application has no electromagnetic interference in the oxygen production process, is safe and reliable in starting and low in oxygen production cost.

Description

Technical Field

[0001] This invention relates to the field of chemical reaction equipment technology, specifically to a chemical oxygen generator and its assembly method. Background Technology

[0002] Oxygen is essential for human survival and respiration, and it is also a crucial factor affecting the efficiency of operators. To ensure the safety of drivers and passengers and normal operation, the oxygen concentration in the closed-chamber operation compartment needs to be controlled between 19% and 21%. To maintain this concentration, an oxygen supply system is required. Currently, oxygen supply methods include liquid oxygen supply, molecular sieve oxygen supply, compressed oxygen source oxygen supply, and chemical oxygen supply. Liquid oxygen supply requires vaporization, depressurization, and finally mixing before being released into the vehicle compartment for personnel respiration. Liquid oxygen has high purity, does not cause secondary pollution to the compartment, and is economical and reliable. However, it needs to be stored below -183℃, maintaining a low temperature for extended periods, making it highly susceptible to temperature fluctuations and resulting in high production costs. Molecular sieve oxygen supply equipment is complex in structure and large in size, and produces oxygen concentrations below 40%. The adsorption efficiency of the required adsorbent is easily affected by humidity and temperature. Compressed oxygen source oxygen production is a physical method, requiring significant energy consumption, and the storage containers are pressure vessels, posing safety hazards. Chemical oxygen supply mainly utilizes oxygen-generating propellant columns made of solid oxychlorate. These columns are pressed or cast to form a chemical oxygen generator. When in use, the propellant column is ignited, and the heated column continuously releases oxygen to supply breathing for the personnel in the cabin, thus serving as an oxygen supply device. The oxygen-generating propellant core can be activated by piezoelectric ceramics generating instantaneous high voltage, by a spark plug, or by electrical power.

[0003] Chinese utility model patents CN212503989U and CN2327403Y use piezoelectric ceramics to generate instantaneous high voltage for startup. The instantaneous high voltage process will generate electromagnetic interference, affecting the normal use of instruments and equipment.

[0004] Chinese invention patent CN112960651B describes a chemical oxygen generator with a gas path and a fixed core structure. The firing mechanism of this chemical oxygen generator uses a primer to strike a delay propellant, igniting the oxygen-producing core. This device has a complex structure, is difficult to assemble, and has a high starting temperature. Furthermore, the primer is a pyrotechnic item, and its transportation and use are subject to control. During assembly, the cylinder is encased in a large sheet of copper, resulting in high costs.

[0005] Many chemical oxygen generators utilize DC power for startup. For example, the vehicle-mounted oxygen supply device in Chinese utility model patent CN201923844U includes an oxygen supply unit, a controller, and a gas delivery pipeline. Its oxygen supply unit employs a chemical oxygen supply method, providing a miniaturized vehicle-mounted oxygen supply device with high oxygen concentration. However, the oxygen supply unit in this patent is not described in detail. The handheld oxygen supply device in Chinese utility model patent CN214415391U has a piezoelectric plate inside its casing. The upper part of the piezoelectric plate is connected to a discharge mechanism for initiating a thermochemical reaction, and the lower part of the piezoelectric plate houses a battery powering the discharge mechanism. During the initial initiation of the thermochemical reaction, the temperature reaches 400℃-500℃, posing a significant safety hazard to the installed battery. The portable personal oxygen supply device in Chinese utility model patent CN201643286U does not mention the internal structure or assembly method of the oxygen generator.

[0006] In the existing technology of oxygen supply devices, firstly, chemical oxygen generators that are started by instantaneous high voltage have electromagnetic interference problems; secondly, chemical oxygen generators that are started by impact primer have complex assembly structures and are expensive; and thirdly, no relevant patent documents have been found regarding the internal structure and assembly method of oxygen generators started by DC power supply. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, one objective of this invention is to provide a chemical oxygen generator that is powered on, has no electromagnetic interference, is safe and reliable to start, and is inexpensive. Another objective of this invention is to provide an assembly method based on this chemical oxygen generator, which is reasonably designed, has a simple structure, is easy to assemble, and is convenient for operators to use.

[0008] A chemical oxygen generator includes a firing mechanism assembly, a zirconium-containing blanket, an oxygen-generating core assembly, a housing, a purification material assembly, a heat insulation material, and an outlet end;

[0009] The firing mechanism assembly and the outlet end are respectively sealed and fixed to the upper and lower ends of the housing. The oxygen-generating cartridge is fixed inside the housing by heat insulation material and zirconium-containing blanket. A purification material assembly is installed in the cavity between the bottom of the oxygen-generating cartridge and the outlet end. The firing mechanism of the firing mechanism assembly passes through the zirconium-containing blanket and contacts the oxygen-generating cartridge assembly. The firing mechanism is started by low voltage, which causes the oxygen-generating cartridge to generate oxygen. The purification material assembly adsorbs impurities in the oxygen-generating gas generated by the oxygen-generating cartridge and provides an air passage. The outlet end is used to restrict the axial movement of the oxygen-generating cartridge assembly, heat insulation material and purification material assembly inside the housing and to provide an outlet channel for the purified oxygen.

[0010] Furthermore, the firing mechanism assembly includes an upper end cover and a firing mechanism, the firing mechanism including an ignition head, a ceramic tube, a wire, a bolt, an inner gasket, an inner hole sealing gasket, an outer gasket, and a nut;

[0011] Two through holes are machined on the upper end cover. The diameter of the through holes is the same as the outer diameter of the inner hole sealing gasket. The inner hole sealing gasket is placed horizontally in the through holes, with the direction of the oxygen-generating core defined as the inner side. The inner and outer gaskets are placed on the inner and outer sides of the upper end cover, respectively. The head of the bolt is located on the inner side of the upper end cover. The bolt passes through the inner gasket, the inner hole sealing gasket, and the outer gasket in sequence and is then locked by a nut. One end of each of the two wires is fixed to the head of the two bolts, and the other end of the two wires is connected to the positive and negative terminals of the ignition head installed inside the ceramic tube. The upper end cover is sealed and welded to the upper end of the shell.

[0012] Furthermore, the oxygen-generating core assembly includes a first oxygen-generating core, a last oxygen-generating core, a middle oxygen-generating core, a delay charge, an ignition charge, and a metal cover. The first, middle, and last oxygen-generating cores have the same outer diameter but different shapes at both ends. Both ends of the first oxygen-generating core are grooves, one end for holding the delay charge and the ignition charge, and the other end for engaging with the protrusion of the next oxygen-generating core. The ignition head element of the firing mechanism contacts the ignition charge. The middle oxygen-generating core has a protrusion at one end and a groove at the other end. The last oxygen-generating core has a protrusion at one end and a flat surface at the other end. The first, middle, and last oxygen-generating cores are sequentially connected to form a complete oxygen-generating core. The metal cover is fitted over the first oxygen-generating core. The oxygen-generating core is composed of sodium chlorate (oxygen source), iron powder fuel, cobalt oxide catalyst, and magnesium oxide additive.

[0013] Furthermore, the metal cover is fixed to the oxygen-generating core at the first end by two metal wires. The metal wires pass axially through both sides of the oxygen-generating core and around the top of the metal shell, with the two ends of the metal wires converging at the bottom of the oxygen-generating core at the end. The two metal wires are arranged in a cross shape, and the two sides of the metal wires are bent at a certain angle to secure them.

[0014] Furthermore, the purification material component includes a perforated metal mesh, a granular interlayer material, and the purification material. The perforated metal mesh and the granular interlayer material confine the purification material within the space below the oxygen-generating core component inside the shell. The perforated metal mesh provides the gas path, the purification material adsorbs moisture and gaseous impurities, and the granular interlayer material is made of the same material as the insulation material, serving to isolate and prevent particles from falling off.

[0015] Furthermore, the purification material is composed of soda lime particles and chemical filter particles, wherein the chemical filter particles are one or more of hopalat agent or precious metal particles.

[0016] Furthermore, the thermal insulation material is a combination of one or more of ceramic fiber, glass fiber, aerogel felt, and high-silica needle-punched felt.

[0017] Furthermore, the shell is cylindrical in shape and made of stainless steel or tinplate; the metal cover is made of brass.

[0018] Furthermore, the air outlet includes a lower end cover and an air outlet, the lower end cover is sealed and welded to the lower end of the housing, and the air outlet is welded on the lower end cover.

[0019] A method for assembling a chemical oxygen generator includes the following steps:

[0020] S1: Pass the firing mechanism in the firing mechanism assembly through the zirconium blanket and the metal shell in sequence;

[0021] S2: The oxygen-generating cartridge is installed with grooves and protrusions in the order of the first oxygen-generating cartridge, the middle oxygen-generating cartridge, and the last oxygen-generating cartridge. The delay cartridge is placed in the groove of the first oxygen-generating cartridge.

[0022] S3: Place the ignition head of the firing mechanism assembled according to step S1 into the delay charge, and use the ignition charge to seal the ignition head. At this time, the groove of the oxygen-generating core at the front end is filled.

[0023] S4: Fit the metal shell from step S1 onto the oxygen-generating cartridge at the beginning. Six grooves are evenly arranged around the metal shell to facilitate fixing the oxygen-generating cartridge.

[0024] S5: Two metal wires are used to fix the oxygen-generating core. The two metal wires pass through both sides of the oxygen-generating core axially and wrap around the metal shell. The two ends of the metal wires meet at the bottom of the oxygen-generating core. The two metal wires are arranged in a cross shape, and the two sides of the metal wires are bent at a certain angle to tighten the metal wires.

[0025] S6: Wrap 4-5 layers of heat insulation material around the oxygen-generating core to fit the shell. The width of the heat insulation material shall not be less than the combined length of the zirconium blanket, the metal shell and the oxygen-generating core.

[0026] S7: Invert the assembled oxygen-generating cartridge and shell onto the grooved fixture.

[0027] S8: Place the perforated metal plate mesh, quicklime granules, granular interlayer material, chemical filter granules, granular interlayer material, and the perforated metal plate mesh in sequence at the bottom of the oxygen-generating core; the perforated metal plate mesh provides the gas path; the granular interlayer material is the same material as the heat insulation material, which serves to isolate and prevent granules from falling off.

[0028] S9: Place the gas outlet on the housing, and seal the two ends of the housing with the upper and lower end caps respectively to complete the assembly of the chemical oxygen generator.

[0029] Beneficial effects:

[0030] 1. The firing mechanism component of the present invention starts with low voltage to induce oxygen production in the oxygen-producing cartridge. Since it is started using a low-voltage DC power supply, it does not generate high-energy electromagnetic interference and poses no hidden danger to the operation of instruments and meters in the vehicle.

[0031] 2. In the firing mechanism assembly of the present invention, the firing assembly is designed with an ignition head inserted into a ceramic tube and encapsulated in the ignition charge. The ignition head is not easy to fall off, and at the same time, it prevents the firing mechanism from malfunctioning, making the firing safe and reliable.

[0032] 3. The firing mechanism component of the present invention does not use pyrotechnics, and the raw materials do not use expensive metal materials such as copper sheets, resulting in low cost.

[0033] 4. The oxygen-generating cartridge of this invention adopts a segmented structure, with grooves and protrusions connecting the cartridges. The grooved section of the oxygen-generating cartridge fully preheats the protrusion of the next segment, greatly reducing the probability of combustion interruption. Furthermore, in the pressing of the oxygen-generating cartridge, the segmented pressing method results in more uniform density and shorter pressing time, leading to higher production efficiency.

[0034] 5. In this invention, a metal shell is placed over the oxygen-generating core at the first end. The initial combustion rate of the oxygen-generating core at the first end is relatively fast, which can easily lead to deflagration. The metal shell can suppress deflagration and prevent accidents caused by deflagration of the core. By binding the copper shell and the oxygen-generating core together with metal wire, not only is the oxygen-generating core fixed, but the gap between the copper wire and the heat insulation material forms a channel for oxygen gas, thereby ensuring the safety of oxygen supply.

[0035] 6. The assembly method provided by this invention assembles and fixes the oxygen-generating core assembly and firing mechanism assembly within the housing through a reasonable assembly sequence. The structure is simple and easy to assemble. Simultaneously, an ignition head encapsulation structure is introduced into the firing mechanism assembly, ensuring safe and reliable startup of the chemical oxygen generator. A tightly fitted groove structure is set inside multiple oxygen-generating cores, ensuring continuous and stable oxygen supply. Reliable startup at the starting end is achieved while maintaining continuous oxygen supply. Compared to existing processes, pyrotechnics that do not use a primer do not require the use of copper plates to encase the oxygen-generating core, resulting in a simpler structure, eliminating the need for copper plate processing, and utilizing flexible materials such as heat-insulating materials, facilitating assembly. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the chemical oxygen generator of the present invention;

[0037] Figure 2 A schematic diagram of the firing mechanism components for the invention;

[0038] Figure 3 This is a schematic diagram of the oxygen-generating cartridge fixing method of the present invention.

[0039] Among them, 1-firing mechanism assembly, 1.1-firing mechanism, 1.2-upper end cover, 2-zirconium blanket, 3-ignition charge, 4-metal shell, 5-delay charge, 6-heat insulation material, 7-oxygen-producing core, 7.1-first oxygen-producing core, 7.2-other oxygen-producing cores, 7.3-end oxygen-producing core, 8-shell, 9-metal perforated plate mesh, 10-granular interlayer material, 11-purification material, 11.1-soda lime granules, 11.2-chemical filter granules, 12-exhaust end, 12.1-lower end cover, 12.2-exhaust port, 13-ignition head, 14-ceramic tube, 15-wire, 16-brass bolt, 17-inner gasket, 18-inner hole sealing gasket, 19-outer gasket, 20-nut, 21-screw. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] This invention provides a chemical oxygen generator and its assembly method, as shown in the attached figure. Figure 1 As shown, Figure 1 As shown, it includes a firing mechanism assembly 1, an oxygen-generating cartridge 7, a housing 8, a purification material 11, a heat insulation material 6, and an air outlet 12.

[0042] The firing mechanism assembly 1 is located at the top of the housing 8, such as... Figure 2 As shown, it consists of a firing mechanism 1.1 and an upper cover 1.2. The upper cover 1.2 has two through holes. The firing mechanism 1.1 is fixed to the upper cover 1.2. The firing mechanism 1.1 consists of a conduction mechanism made of brass bolts 16 and an initiation mechanism made of an ignition head element 13, a ceramic tube 14 with two through holes, and two connecting wires 15. With the direction of the oxygen-producing cartridge as the inside, the screw 21 of the brass bolts 16 is located inside the upper cover 1.2. The screw 21 passes through the inner gasket mica sheet 17, the inner hole sealing PTFE gasket 18, the outer gasket mica sheet 19, and the nut 20 in sequence. A hand-cranked power supply or a DC power supply is provided in the vehicle, providing a low voltage of 24V. The power supply is connected to both ends of the screw 21 to start the initiation mechanism, which in turn causes the oxygen-producing cartridge 7 to produce oxygen.

[0043] The ignition head in the ignition head element 13 is covered with a sensitive agent. One end of each of the two connecting wires 15 is connected to one wire of the ignition head, passes through the ceramic tube 14 through the through hole, and the other end is fixed to the screw 21 by winding.

[0044] The oxygen-generating cartridge 7 consists of three separate cartridges: the first oxygen-generating cartridge 7.1, the last oxygen-generating cartridge 7.3, and the middle oxygen-generating cartridge 7.2, which have different shapes. The oxygen-generating cartridge is composed of sodium chlorate (oxygen source), iron powder (fuel), cobalt oxide (catalyst), and magnesium oxide (additive). The first oxygen-generating cartridge 7.1 has the following composition: 93.6% sodium chlorate (all contents are mass fractions), 4% iron powder, 1.4% cobalt oxide, and 1% magnesium oxide; the middle oxygen-generating cartridge 7.2 has the following composition: 95.5% sodium chlorate, 3% iron powder, 0.5% cobalt oxide, and 1% magnesium oxide; and the last oxygen-generating cartridge 7.3 has the following composition: 97.8% sodium chlorate, 1% iron powder, 0.2% cobalt oxide, and 1% magnesium oxide.

[0045] The first oxygen-generating core 7.1 has grooves at both ends; one end is used to hold the ignition charge 3 and the delay charge 5, and the other end connects to the groove of the next oxygen-generating core 7.2. The middle oxygen-generating core 7.2 has a groove at one end and a groove at the other. The last oxygen-generating core 7.3 has a groove at one end and a flat surface at the other. The oxygen-generating core 7 is mainly composed of sodium chlorate.

[0046] The shell 8 is cylindrical and made of stainless steel.

[0047] The purification material 11 is composed of quicklime particles 11.1 and chemical filter particles 11.2.

[0048] The thermal insulation material 6 is made of one or more of the following: ceramic fiber, glass fiber, aerogel felt, and high-silica needle-punched felt. The air outlet 12 consists of a lower end cap 12.1 and an air outlet 12.2. The lower end cap 12.1 and the air outlet 12.2 are fixed together by welding. The upper end cap 1.2 of the firing mechanism assembly 1 and the lower end cap 12.1 of the air outlet 12 are sealed and fixed to both ends of the housing 8 by welding.

[0049] This embodiment also provides an assembly method using the above-described chemical oxygen generator, including the following steps:

[0050] S1: The firing mechanism component 1 passes through the zirconium blanket 2 and the brass shell 4 in sequence.

[0051] S2: Install the oxygen-generating cartridge 7 in the order of the first oxygen-generating cartridge 7.1, the remaining oxygen-generating cartridges 7.2, and the last oxygen-generating cartridge 7.3, and place the delay cartridge 5 in the groove of the first oxygen-generating cartridge 7.1.

[0052] S3: Place the ignition head element 13 of the firing structure assembly 1 assembled according to step S1 into the delay charge 5, and encapsulate the ignition head element 13 with the ignition charge 3, so that the groove of the oxygen-generating core 7.1 at the front end is filled.

[0053] S4: Cover the oxygen-generating core 7.1 at the beginning with the brass shell 4 from step S1. The brass shell 4 has 6 grooves evenly arranged around its perimeter to facilitate fixing the oxygen-generating core.

[0054] S5: Two copper wires 22 are used to fix the oxygen-generating core 7. The two copper wires 22 pass axially through both sides of the oxygen-generating core 7 and around the brass shell 4 in step S1. The two ends of the copper wires 22 meet at the bottom of the end oxygen-generating core 7.3, forming a cross shape. The two sides of the copper wires 22 are bent at a certain angle to tighten the copper wires. The presence of the copper wires 22 provides a metal heat transfer medium, which is conducive to the heat transfer of the oxygen-generating core 7. The gap between the copper wires 22 and the heat insulation material 6 forms a channel for oxygen gas, which promotes the progress of the oxygen generation process. The separate oxygen-generating core 7 has a groove and concave groove inside that fits tightly. The external structure is that the copper wires 22 bind and fix the brass shell 4 and the oxygen-generating core 7, and make a tight fit at a certain angle to achieve the fixation of the oxygen-generating core 7.

[0055] S6: Wrap multiple layers of heat insulation material 6 around the oxygen-generating core 7, with 4-5 layers, to fit the shell 8. The width of the heat insulation material 6 is not less than the combined length of the zirconium blanket 2, the brass shell 4, and the oxygen-generating core 7.

[0056] S7: Invert the assembled oxygen-generating core 7 and shell 8 onto the grooved fixture;

[0057] S8: Place metal perforated plate mesh 9, quicklime granules 11.1, granular interlayer material 10, chemical filter granules 11.2, granular interlayer material 10 and metal perforated plate mesh 9 in sequence at the bottom of oxygen-generating core 7.

[0058] S9: Place the outlet end 12 on the housing 8, weld the upper end cover 1.2 to the housing 8 and the lower end cover 12.1 to the housing 8 to complete the assembly of the chemical oxygen generator.

[0059] Using this assembly method, 53 chemical oxygen generators were assembled. All of them were started using a 24V low-voltage power supply. All chemical oxygen generators started normally, and the start-up was safe and reliable. No pyrotechnics or expensive raw materials were used, resulting in low cost. The copper shell and oxygen-generating core were bound together with metal wires, making the structure simple and easy to assemble.

[0060] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A chemical oxygen generator, characterized in that, Includes firing mechanism components, zirconium-containing blanket, oxygen-generating cartridge components, housing, purification material components, heat insulation materials, and air outlet; The firing mechanism assembly and the outlet end are respectively sealed and fixed to the upper and lower ends of the housing. The oxygen-generating core is fixed inside the housing by heat insulation material and a zirconium-containing blanket. The oxygen-generating core assembly includes a head oxygen-generating core, a tail oxygen-generating core, an intermediate oxygen-generating core, a delay charge, an ignition charge, and a metal cover. The head oxygen-generating core is composed of: 93.6% sodium chlorate, 4% iron powder, 1.4% cobalt oxide, and 1% magnesium oxide; the intermediate oxygen-generating core is composed of: 95.5% sodium chlorate, 3% iron powder, 0.5% cobalt oxide, and 1% magnesium oxide; the tail oxygen-generating core... The core is composed of 97.8% sodium chlorate, 1% iron powder, 0.2% cobalt oxide, and 1% magnesium oxide. A purification material assembly is installed in the cavity between the bottom of the oxygen-generating core and the outlet end. The firing mechanism of the firing mechanism assembly passes through the zirconium-containing blanket and contacts the oxygen-generating core assembly. The firing mechanism is started by low voltage, thereby causing the oxygen-generating core to generate oxygen. The purification material assembly adsorbs impurities in the oxygen-generating gas produced by the oxygen-generating core and provides an air passage. The outlet end is used to restrict the axial movement of the oxygen-generating core assembly, the heat insulation material, and the purification material assembly inside the shell and to provide an outlet channel for the purified oxygen. The firing mechanism assembly includes an upper end cover and a firing mechanism, which includes an ignition head, a ceramic tube, a wire, a bolt, an inner gasket, an inner hole sealing gasket, an outer gasket, and a nut. Two through holes are machined on the upper end cover. The diameter of the through holes is the same as the outer diameter of the inner hole sealing gasket. The inner hole sealing gasket is placed horizontally in the through holes, with the direction of the oxygen-generating core defined as the inner side. The inner and outer gaskets are placed on the inner and outer sides of the upper end cover, respectively. The head of the bolt is located on the inner side of the upper end cover. The bolt passes through the inner gasket, the inner hole sealing gasket, and the outer gasket in sequence and is then locked by a nut. One end of each of the two wires is fixed to the head of the two bolts, and the other end of the two wires is connected to the positive and negative terminals of the ignition head installed inside the ceramic tube. The upper end cover is sealed and welded to the upper end of the shell.

2. The chemical oxygen generator as described in claim 1, characterized in that, The first oxygen-generating core, the middle oxygen-generating core, and the last oxygen-generating core have the same outer diameter but different shapes at both ends. Both ends of the first oxygen-generating core are grooves. One end is used to place the delay charge and the ignition charge, and the other end is connected to the groove of the next oxygen-generating core. The ignition head element of the firing mechanism is in contact with the ignition charge. One end of the oxygen-generating cartridge is provided with a protrusion, and the other end is provided with a groove; One end of the oxygen-generating cartridge is provided with a convex groove, and the other end is a flat surface. The first oxygen-generating cartridge, the middle oxygen-generating cartridge, and the last oxygen-generating cartridge are sequentially connected to form a complete oxygen-generating cartridge. The metal cover is fitted over the outside of the first oxygen-generating cartridge.

3. The chemical oxygen generator as described in claim 1, characterized in that, The metal cover is fixed to the oxygen-generating core at the first end by two metal wires. The metal wires pass axially through both sides of the oxygen-generating core and around the top of the metal shell. The two ends of the metal wires meet at the bottom of the oxygen-generating core at the end. The two metal wires are arranged in a cross shape, and the two sides of the metal wires are bent at a certain angle to secure the metal wires.

4. The chemical oxygen generator as described in claim 1, characterized in that, The purification material assembly includes a perforated metal plate mesh, a granular interlayer material, and a purification material. The perforated metal plate mesh and the granular interlayer material confine the purification material within the space below the oxygen-generating core assembly inside the shell. The perforated metal plate mesh provides the gas path, the purification material adsorbs moisture and gaseous impurities, and the granular interlayer material is made of the same material as the heat insulation material, serving to isolate and prevent particles from falling off.

5. The chemical oxygen generator as described in claim 4, characterized in that, The purification material consists of soda lime particles and chemical filter particles, wherein the chemical filter particles are one or more of hopalat agent or precious metal particles.

6. The chemical oxygen generator as described in claim 1, characterized in that, The thermal insulation material is a combination of one or more of the following: ceramic fiber, glass fiber, aerogel felt, and high-silica needle-punched felt.

7. The chemical oxygen generator as described in claim 1, characterized in that, The outer shell is cylindrical and made of stainless steel or tinplate; the metal cover is made of brass.

8. The chemical oxygen generator as described in claim 6 or 7, characterized in that, The air outlet includes a lower end cover and an air outlet. The lower end cover is sealed and welded to the lower end of the housing, and the air outlet is welded on the lower end cover.

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