A propellant grain and chemical oxygen generator

Abstract

The application provides a medicine column and a chemical oxygen generator, and belongs to the technical field of chemical oxygen generation devices. The medicine column is provided with a star-shaped taper hole, one end of the star-shaped taper hole penetrates the head of the medicine column, the other end of the star-shaped taper hole extends towards the tail of the medicine column and does not penetrate the tail of the medicine column; the surface of the star-shaped taper hole is used for pressing an ignition layer. When the ignition assembly generates a flame and a hot particle flow, the star-shaped taper surface of the medicine column can be instantaneously and comprehensively ignited. During combustion, the burning surface continuously advances outward, and the area of the continuously advancing burning surface is basically equal to the area of the star-shaped taper surface. At the same time, the process of the continuously advancing burning surface from inside to outside can enable heat to remain in the medicine column to provide energy for subsequent combustion, the temperature rise of the shell of the chemical oxygen generator is slowed down, the design requirement of small diameter and large flow is met, and the practical effect is good. The chemical oxygen generator comprising the above medicine column also has the above effects.

Description

Technical Field

[0001] This invention relates to the field of chemical oxygen generator technology, and more specifically, to a propellant column and a chemical oxygen generator. Background Technology

[0002] A chemical oxygen generator is a device that produces oxygen through a chemical reaction. In the present technology, a chemical oxygen generator generally includes a propellant and an ignition assembly. The energy emitted by the ignition assembly ignites one end of the propellant, and once the propellant is ignited, it can continue to burn to the other end, thereby continuously producing oxygen during the combustion process.

[0003] The oxygen production rate of a propellant charge depends on factors such as the burning rate of the formulation and the content of oxygen-producing substances. Typically, the formulation of a propellant charge mainly consists of sodium chlorate, a small amount of metal powder, and metal oxides. However, there is a certain contradiction between the burning rate resulting from the formulation and the content of oxygen-producing substances. When the metal powder content is high, the burning rate is fast, but the oxygen-producing substance content will be relatively low, resulting in less oxygen supply and poorer safety. Conversely, when the metal powder content is low, the burning rate is slow, making it more difficult to achieve high flow rates.

[0004] Currently, there is no technology that can meet the requirements of small diameter and large flow rate.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a propellant column and a chemical oxygen generator that can meet the design requirements of small diameter and large flow rate, and has better practical effect.

[0007] This invention can be implemented as follows:

[0008] In a first aspect, the present invention provides a propellant column having a star-shaped conical hole, one end of which penetrates the head of the propellant column, and the other end of which extends toward the tail of the propellant column but does not penetrate the tail of the propellant column; the surface of the star-shaped conical hole is used to press and ignite the propellant layer.

[0009] In an optional embodiment, the distance between the end of the star-shaped conical orifice near the head of the propellant and the side wall of the propellant is a; the distance between the end of the star-shaped conical orifice near the tail of the propellant and the tail of the propellant is b; where a = b.

[0010] In an optional embodiment, the outer diameter of the star-shaped conical orifice near the head of the propellant is d1; the outer diameter of the star-shaped conical orifice near the tail of the propellant is d2; d1 = 2d2.

[0011] In an optional embodiment, the star-shaped conical orifice is axisymmetric, the propellant is cylindrical, and the star-shaped conical orifice is located at the center of the propellant.

[0012] In an optional embodiment, the thickness of the ignition layer is 0.1 mm to 0.2 mm.

[0013] In an optional embodiment, the star-shaped conical aperture is petal-shaped, and the number of petals in the star-shaped conical aperture is 3-8.

[0014] Secondly, the present invention provides a chemical oxygen generator, which includes an ignition assembly, a support assembly, a thermal insulation assembly, a filter assembly, a housing assembly, and a propellant cartridge according to any of the foregoing embodiments; the ignition assembly is disposed at the head of the propellant cartridge; the support assembly is used to mount and fix the propellant cartridge so that the propellant cartridge is aligned with the ignition assembly; the thermal insulation assembly is disposed around the propellant cartridge; the filter assembly is disposed at the tail of the propellant cartridge; the ignition assembly, the support assembly, the thermal insulation assembly, the filter assembly, and the propellant cartridge are all integrated into the housing assembly.

[0015] In an optional embodiment, the ignition assembly includes a firing pin, an igniter, and a support sleeve. The support sleeve is mounted on the housing assembly, and the igniter is mounted on the support sleeve with the igniter facing the star-shaped conical orifice of the propellant. The firing pin is disposed on the support sleeve and is used to strike the igniter, thereby igniting the ignition layer on the surface of the star-shaped conical orifice.

[0016] In an optional embodiment, the support assembly includes a bell, a resilient claw, and a support claw; the bell is riveted or threaded to the igniter; the resilient claw is disposed between the propellant and the bell to ensure a gap between them, thereby allowing space for gas flow; the bell and the resilient claw jointly support the head of the propellant to restrict radial movement and ensure the propellant is centered; the support claw supports the tail of the propellant, and the bell and the support claw jointly restrict axial movement of the propellant to ensure the propellant is centered.

[0017] In an optional embodiment, the thermal insulation component includes a thermal insulation ring and a thermal insulation sleeve; the thermal insulation ring is disposed between the bell jar and the head of the medicine column; the thermal insulation sleeve is disposed between the support claw and the tail of the medicine column.

[0018] In an optional embodiment, the filter assembly includes a metal woven mesh, aluminum silicate fiber cotton sheets, filter agent, a sintered metal mesh, and a non-woven fabric; the metal woven mesh and aluminum silicate fiber cotton sheets are integrated to form a first filter body and are disposed on the side of the support claw away from the filter cartridge; the sintered metal mesh and the non-woven fabric are integrated to form a second filter body, and the second filter body and the first filter body are disposed at intervals; the filter agent is disposed between the first filter body and the second filter body.

[0019] In an optional embodiment, the housing assembly includes a cylindrical body and a rear end cover; the cylindrical body and the rear end cover are welded together, and the rear end cover is provided with an air outlet; an air outlet space communicating with the air outlet is formed between the second filter body and the rear end cover.

[0020] The beneficial effects of this invention include:

[0021] The propellant grain provided by this invention has a star-shaped conical hole. One end of the star-shaped conical hole penetrates the head of the propellant grain, while the other end extends towards the tail of the propellant grain but does not penetrate it. The surface of the star-shaped conical hole is used to suppress the ignition layer. When the ignition assembly ignites and generates a flame and a stream of hot particles, the star-shaped conical surface of the propellant grain can be instantly and completely ignited. During combustion, the burning surface continuously advances outward, and the area of ​​the advancing burning surface is approximately equal to the area of ​​the star-shaped conical surface. Simultaneously, the process of the burning surface continuously advancing from the inside out allows heat to remain inside the propellant grain, providing energy for subsequent combustion, and slowing down the temperature rise of the outer shell of the chemical oxygen generator. The above solution can meet the design requirements of small diameter and high flow rate, and has excellent practical effects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a chemical oxygen generator provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the drug column from a first-view perspective provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the drug column from a second perspective provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the drug column from a third-person perspective provided in an embodiment of the present invention.

[0027] Icons: 100-Chemical oxygen generator; 10-Ignition assembly; 11-Pull pin; 12-Safety pin; 13-Striking pin; 14-Spring; 15-Pressure cap; 16-O-ring; 17-Igniter; 18-Support sleeve; 20-Support assembly; 21-Bell jar; 22-Elastic claw; 23-Support claw; 30-Thermal insulation assembly; 31-Thermal insulation cotton ring; 32-Thermal insulation cotton sleeve; 40-Filter assembly; 41-Metal woven mesh; 42-Alumina silicate fiber cotton sheet; 43-Filter agent; 44-Metal sintered mesh; 45-Non-woven fabric; 50-Propellant cartridge; 51-Star-shaped conical hole; 60-Shell assembly; 61-Cylinder; 62-Rear end cap. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of terms such as "horizontal" or "vertical" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Example

[0035] Please refer to Figure 1 This embodiment provides a chemical oxygen generator 100, which can meet the design requirements of small diameter and large flow rate, and has good practical effect.

[0036] The chemical oxygen generator 100 includes an ignition assembly 10, a support assembly 20, a thermal insulation assembly 30, a filter assembly 40, a housing assembly 60, and a propellant cartridge 50.

[0037] Ignition assembly 10 is disposed at the head of propellant 50; support assembly 20 is installed and fixed to propellant 50 so that propellant 50 is aligned with ignition assembly 10; thermal insulation assembly 30 is disposed around propellant 50; filter assembly 40 is disposed at the tail of propellant 50; ignition assembly 10, support assembly 20, thermal insulation assembly 30, filter assembly 40 and propellant 50 are all integrated and installed into housing assembly 60.

[0038] The aforementioned support component 20 can ensure that the propellant 50 is aligned with the ignition component 10, thus guaranteeing the ignition effect. In addition, the support component 20 can also ensure the stability of the initial combustion surface of the propellant 50.

[0039] The thermal insulation component 30 is provided to further ensure that the high temperature generated by the combustion of the propellant 50 does not become too high and affect the shell component 60.

[0040] The filter assembly 40 is configured to ensure that the gas produced by the combustion of the propellant column 50 is filtered, thereby obtaining the required clean gas.

[0041] The housing assembly 60 provides support for all components, resulting in a stable and compact structure.

[0042] The ignition assembly 10 can be connected to the housing assembly 60 by welding to ensure the overall pressure resistance and high and low temperature resistance.

[0043] Typically, when a chemical oxygen generator 100 rapidly produces oxygen, it puts a great strain on the structural components, requiring high structural strength. On the other hand, rapid oxygen production can easily lead to incomplete reactions, affecting the purity of the gas components and resulting in a large amount of residue and impurities. To ensure gas purity, filtration is necessary. At the same time, with a large gas flow rate, the filter assembly 40 must not obstruct the gas passage, otherwise it can easily cause pressure buildup, damaging the chemical oxygen generator 100 or even leading to danger.

[0044] In conventional designs, increasing oxygen flow requires increasing combustion rate and expanding the combustion surface. Existing methods for expanding the combustion surface of the propellant grain 50 typically use microporous propellant grains 50 or tablets. Manufacturing microporous propellant grains 50 requires a pore-forming agent, resulting in impure gas composition, which is detrimental to human use and poses certain safety hazards. Furthermore, using tablets results in poor experimental safety. The propellant grain 50 is generally cylindrical or cuboid, and its combustion surface is affected by the flame diameter of the igniter 17 and the diameter of the propellant grain 50. When the diameter of the chemical oxygen generator is small, the combustion surface of the propellant grain 50 is small. To solve this problem, this embodiment features a specially designed propellant grain 50.

[0045] For details, please refer to Figure 2 The propellant 50 has a star-shaped conical hole 51. One end of the star-shaped conical hole 51 penetrates the head of the propellant 50, and the other end of the star-shaped conical hole 51 extends toward the tail of the propellant 50 but does not penetrate the tail of the propellant 50. The surface of the star-shaped conical hole 51 is used to suppress the ignition layer.

[0046] When the ignition assembly 10 ignites to generate a flame and a stream of hot particles, the star-shaped conical surface of the propellant grain 50 can be instantly and completely ignited. During combustion, the burning surface continuously advances outward, and the area of ​​the advancing burning surface is approximately equal to the area of ​​the star-shaped conical surface. Simultaneously, this outward advancement of the burning surface allows heat to remain inside the propellant grain 50, providing energy for subsequent combustion, and slowing down the temperature rise of the outer casing of the chemical oxygen generator 100. This design meets the requirements of a small diameter and high flow rate, and offers excellent practical performance.

[0047] Combination Figure 1 In this embodiment, the ignition assembly 10 includes a firing pin 13, an igniter 17, and a support sleeve 18.

[0048] The support sleeve 18 is installed on the housing assembly 60, and the igniter 17 is installed on the support sleeve 18 with the igniter 17 facing the star-shaped conical hole 51 of the propellant 50. The firing pin 13 is disposed on the support sleeve 18 and is used to strike the igniter 17, thereby igniting the ignition layer on the surface of the star-shaped conical hole 51.

[0049] In addition, the ignition assembly 10 also includes a pull pin 11, a safety catch pin 12, a spring 14, a pressure cap 15, and an O-ring 16. The O-ring 16 can be made of silicone rubber. The pressure cap 15 and the igniter 17 can be connected by threads or riveting. The igniter 17 can be an igniter 17 with a BKN tablet, with a dosage between 20mg and 100mg. The distance between the igniter 17 and the star-shaped conical hole 51 of the propellant 50 can be 10mm to 30mm.

[0050] In this embodiment, the support component 20 includes a bell jar 21, an elastic claw, and a support claw 23.

[0051] The bell jar 21 is riveted or threaded onto the igniter 17; a resilient claw is positioned between the propellant 50 and the bell jar 21 to ensure a gap between them, allowing space for gas flow; the bell jar 21 and the resilient claw jointly support the head of the propellant 50 to restrict radial movement and ensure its centering; the support claw 23 supports the tail of the propellant 50, and the bell jar 21 and the support claw 23 jointly restrict axial movement to ensure its centering. The bell jar 21, the resilient claw, and the support claw 23 can all be made of metal.

[0052] In this embodiment, the thermal insulation component 30 includes a thermal insulation cotton ring 31 and a thermal insulation cotton sleeve 32.

[0053] The heat insulation cotton ring 31 is disposed between the bell jar 21 and the head of the medicine column 50; the heat insulation cotton sleeve 32 is disposed between the support claw 23 and the tail of the medicine column 50.

[0054] The heat insulation component 30 can prevent the heat from being dissipated to the shell component 60 when the propellant 50 is burning, thus preventing the surface temperature of the shell component 60 from rising. It can also store heat to prevent the propellant 50 from burning out. In addition, it can fix the residue produced by the combustion of the propellant 50.

[0055] Typically, the insulation cotton ring 31 can be made of aluminum silicate fiber cotton or glass fiber cotton, preferably low-density, residue-free, and uniform aluminum silicate fiber cotton. The insulation cotton ring 31 is placed at the head of the propellant column 50, and the insulation cotton sleeve 32 covers the tail of the propellant column 50.

[0056] In this embodiment, the filter assembly 40 includes a metal woven mesh 41, an aluminum silicate fiber cotton sheet 42, a filter agent 43, a metal sintered mesh 44, and a non-woven fabric 45.

[0057] A metal woven mesh 41 and an aluminum silicate fiber cotton sheet 42 are integrated to form a first filter body, which is located on the side of the support claw 23 away from the drug column 50; a metal sintered mesh 44 and a non-woven fabric 45 are integrated to form a second filter body, which is spaced apart from the first filter body; a filter agent 43 is disposed between the first filter body and the second filter body.

[0058] The filter agent 43 may comprise a layer of a specially formulated alkali-impregnated hogallat or alkali-impregnated molecular sieve, and a layer of pure hogallat or precious metal alumina spheres. The nonwoven fabric 45 is preferably a high-airflow polyester nonwoven fabric 45, but PET nonwoven fabric 45 can also be selected. Additionally, at least two of the metal woven mesh 41, aluminosilicate fiber cotton sheet 42, metal sintered mesh 44, and nonwoven fabric 45 can be formed into a filter sheet by metal aluminum edging. During assembly, the side of the metal sintered mesh 44 faces the air outlet. Alternatively, ceramic fiber cotton can be added to the filter assembly 40.

[0059] Meanwhile, the support space formed between the sintered metal mesh 44 and the support claw 23 can prevent the gas from being compressed by the gas column 50 and the filter agent 43 due to the high gas pressure, which would cause the filter agent 43 to be compacted without support and block the gas outlet channel.

[0060] In this embodiment, the housing assembly 60 includes a cylindrical body 61 and a rear end cover 62; the cylindrical body 61 and the rear end cover 62 are welded together, and the rear end cover 62 is provided with an air outlet; an air outlet space communicating with the air outlet is formed between the second filter body and the rear end cover 62.

[0061] The air outlet space helps prevent blockage and maintain airflow speed. In this embodiment, the rear cover 62 is an arc-shaped cover of uniform thickness. Alternatively, a flat cover with a recessed groove of 1-4mm at the air outlet can also be selected.

[0062] Please refer to this as well. Figures 2 to 4 The distance between the end of the star-shaped conical hole 51 near the head of the propellant 50 and the side wall of the propellant 50 is 'a'; the distance between the end of the star-shaped conical hole 51 near the tail of the propellant 50 and the tail of the propellant 50 is 'b'; where a = b. In other words, the thickness of the side of the propellant 50 and the thickness of the bottom of the propellant 50 are equal, which makes the outward propulsion process of the propellant 50 uniform and stable during combustion.

[0063] For reference, in this embodiment, the outer diameter of the star-shaped conical orifice 51 near the head of the propellant 50 is d1; the outer diameter of the star-shaped conical orifice 51 near the tail of the propellant 50 is d2; d1 = 2d2. In other words, the head of the star-shaped conical orifice 51 is twice the size of its tail.

[0064] In practice, dimensions “a” and “b” can be equal or similar, and dimension “d1” can be twice, 2.5 times, or three times the size of dimension “d2”.

[0065] In this embodiment, the star-shaped conical hole 51 is axially symmetric, the drug grain 50 is cylindrical, and the star-shaped conical hole 51 is located at the center of the drug grain 50. The above structure has strong stability.

[0066] In this embodiment, the thickness of the ignition layer can be 0.1mm to 0.2mm, such as 0.1mm, 0.15mm or 0.2mm.

[0067] In this embodiment, the star-shaped conical orifice 51 is petal-shaped, and the number of petals in the star-shaped conical orifice 51 is 3-8. It should be noted that the more petals there are, the larger the burning surface, but this brings problems to the processability and strength of the drug delivery column 50. Therefore, the number of petals can be 3, 4, 5, 6, 7, 8 or other parameters.

[0068] In conclusion, the chemical oxygen generator 100 provided by the present invention has at least the following advantages:

[0069] When the igniter 17 is fired, the flame and hot particle stream generate enough heat to instantly and completely ignite the inner surface of the propellant grain 50, i.e., the star-shaped cone. This solves the problem of small-diameter, high-flow-rate chemical oxygen generators 100 by improving the ignition surface of the propellant grain 50, while producing no toxic or harmful gases and ensuring stable oxygen production. Furthermore, since the adjustment is not based on the formulation, safety performance is improved. This product is suitable for applications requiring high initial flow rates, limited space, and rapid oxygen replenishment. It features a small diameter, light weight, and requires no maintenance.

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. 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 by, The application relates to a propellant grain and a propellant grain ignition device, and belongs to the technical field of propellant grain ignition devices. The ignition device is arranged on the head of the propellant grain; the supporting assembly is used for fixing the propellant grain, so that the propellant grain is aligned with the ignition device; the heat insulation assembly is arranged around the propellant grain; the filter assembly is arranged on the tail of the propellant grain; and the ignition device, the supporting assembly, the heat insulation assembly, the filter assembly and the propellant grain are integrally arranged on the shell assembly.

2. The chemical oxygen generator of claim 1, wherein The distance between the end of the star-shaped conical hole near the head of the propellant grain and the side wall of the propellant grain is a; the distance between the end of the star-shaped conical hole near the tail of the propellant grain and the tail of the propellant grain is b; wherein a=b. The outer diameter of the end of the star-shaped conical hole near the head of the propellant grain is d1; the outer diameter of the end of the star-shaped conical hole near the tail of the propellant grain is d2; and d1=2d2.

3. The chemical oxygen generator of claim 1, wherein The star-shaped conical hole is axisymmetric, and the propellant grain is cylindrical; the star-shaped conical hole is located in the center of the propellant grain. Alternatively, the star-shaped conical hole is petal-shaped, and the number of petals of the star-shaped conical hole is 3-8.

4. The chemical oxygen generator of claim 1, wherein The thickness of the ignition layer is 0.1mm-0.2mm.

5. The chemical oxygen generator of claim 1, wherein The ignition device comprises a firing pin, an igniter and a supporting sleeve; the supporting sleeve is arranged on the shell assembly; the igniter is arranged on the supporting sleeve and faces the star-shaped conical hole of the propellant grain; and the firing pin is arranged on the supporting sleeve and is used for impacting the igniter, so that the igniter ignites the ignition layer on the surface of the star-shaped conical hole.

6. The chemical oxygen generator of claim 5, wherein The supporting assembly comprises a bell, an elastic clamping jaw and a supporting claw; the bell is riveted or screwed on the igniter; the elastic clamping jaw is arranged between the propellant grain and the bell and is used for ensuring that there is a gap between the propellant grain and the bell, so as to provide space for gas flow; the bell and the elastic clamping jaw are used for jointly supporting the head of the propellant grain, so as to limit the radial movement of the propellant grain and ensure that the propellant grain is centered; and the supporting claw is used for supporting the tail of the propellant grain, and the bell and the supporting claw are used for jointly limiting the axial movement of the propellant grain, so as to ensure that the propellant grain is centered.

7. The chemical oxygen generator of claim 6, wherein The heat insulation assembly comprises a heat insulation cotton ring and a heat insulation cotton sleeve; the heat insulation cotton ring is arranged between the bell and the head of the propellant grain; and the heat insulation cotton sleeve is arranged between the supporting claw and the tail of the propellant grain.

8. The chemical oxygen generator of claim 7, wherein The filter assembly comprises a metal woven mesh, an aluminum silicate fiber cotton sheet, a filter medicament, a metal sintered mesh and a non-woven fabric; the metal woven mesh and the aluminum silicate fiber cotton sheet are integrated to form a first filter body, and are arranged on a side of the support claw away from the propellant column; the metal sintered mesh and the non-woven fabric are integrated to form a second filter body, and the second filter body and the first filter body are arranged in a spaced manner; the filter medicament is arranged between the first filter body and the second filter body.

9. The chemical oxygen generator of claim 8, wherein, The shell assembly comprises a barrel and a rear end cover; the barrel and the rear end cover are welded together, and the rear end cover is provided with an air outlet; an air outlet space in communication with the air outlet is formed between the second filter body and the rear end cover.

Images