Quick-release four-stage filter airborne oxygen generation system

Abstract

The utility model discloses a quick release type four-stage filter airborne oxygen generation system, which comprises a gas source assembly and an oxygen concentrator, the gas source assembly comprises a gas source shell, a first filter is arranged on the gas source shell, the oxygen concentrator comprises a bottom plate, and a base, a third filter, a fourth filter, a molecular sieve cylinder and an oxygen storage cylinder which are arranged on the bottom plate, a second filter is installed in the molecular sieve cylinder, a guide seat is installed at the position, corresponding to the first filter, of the air source shell, the first filter is installed in an installation groove of the guide seat, the base is installed on the bottom plate, the molecular sieve cylinder, the oxygen storage cylinder and the third filter are installed on the base, and the air compressor is connected with the molecular sieve cylinder through the third filter. The molecular sieve cylinder is connected with the oxygen storage cylinder, and the fourth filter is installed in the oxygen storage cylinder. According to the utility model, a four-stage filtering and purifying function is realized, the cleanliness of oxygen output by the oxygen storage cylinder is improved, the filter element can be quickly disassembled and assembled when the filter element needs to be cleaned or replaced, the time and the labor cost are saved, and the application is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to an airborne oxygen generating system, especially to a quick-release four-stage filter airborne oxygen generating system. BACKGROUND

[0002] Since oxygen has been used on the aircraft, it has been nearly a hundred years of history, from the initial gas oxygen, liquid oxygen, to the present airborne oxygen generating, chemical oxygen, different forms of oxygen source are still applied on various aircrafts, and the airborne oxygen system including oxygen generating machine and other equipment has gradually become mainstream.

[0003] The airborne oxygen system is a special oxygen supply system for aviation equipment such as aircraft, generally including oxygen generating equipment, oxygen regulating equipment, breathing equipment, etc., wherein the oxygen generated by the oxygen generating equipment needs to meet the oxygen use requirements of GB 8982-2009 "Medical and Aviation Respiratory Oxygen": the total pollutants of respiratory oxygen should not be toxic to the user, the effective period of medical oxygen and aviation respiratory oxygen is 1 year, etc. Since oxygen is a very active chemical substance, it can cause combustion or explosion by undergoing violent chemical changes with many substances. The contaminated respiratory oxygen may affect the work efficiency of the crew, and there is a serious flight safety risk. Therefore, it is crucial to effectively and reliably filter the oxygen of the airborne oxygen system.

[0004] The oxygen generating equipment is mainly composed of a gas source assembly and an oxygen concentrator, wherein the gas source assembly mainly includes a shell and an internal air compressor (i.e. air compressor), and the oxygen concentrator mainly includes a bottom plate, a molecular sieve cylinder, an oxygen storage cylinder, a comprehensive oxygen socket, various pipelines, valves and the like installed on the bottom plate; the oxygen generating equipment of the traditional airborne oxygen system has the following defects: first, the filter is generally arranged at the air inlet end of the gas source assembly and in the molecular sieve cylinder in the traditional structure, but no filter is arranged at the air inlet end of the molecular sieve cylinder and in the oxygen storage cylinder, resulting in low filtering level and incomplete filtering, because the pipeline between the air compressor and the molecular sieve cylinder and the oxygen storage cylinder may still be contaminated, so that the oxygen purity of the oxygen output by the oxygen storage cylinder may not be high enough, affecting the safety of oxygen inhalation of the oxygen inhalation personnel; second, the filter may be blocked by impurities inside the filter after long-term use, thereby seriously reducing the filtering efficiency of the filter, and even affecting the physiological safety of the oxygen inhalation personnel during breathing, so that the filter needs to be removed for cleaning or replacement of the filter element, and then reinstalled, the filter in the traditional structure adopts a fixed mounting structure, and the equipment is installed in a small space (such as an aircraft cabin), so the gas source assembly and the oxygen concentrator generally need to be integrally removed from the related equipment (such as an aircraft) first, and then transferred to other sites to remove the filter, which is time-consuming and laborious and inconvenient to use. SUMMARY

[0005] The utility model discloses a quick -detachable four -stage filter oxygen -generating system of aircraft, including gas source subassembly and oxygen concentrator, the gas source subassembly includes gas source casing and is located in the air compressor of gas source casing, the first filter is installed to the position of the air inlet of air compressor on the gas source casing, the oxygen concentrator includes bottom plate and installs molecular sieve cylinder and oxygen storage cylinder on the bottom plate, the air outlet of air compressor is connected with the air inlet of molecular sieve cylinder through air pipe, the oxygen outlet of molecular sieve cylinder is connected with the air inlet of oxygen storage cylinder through oxygen pipe, the second filter is installed in molecular sieve cylinder, the guide seat is installed to the position of the first filter on the gas source casing, the mounting groove of upper end opening is equipped on the guide seat, the first filter includes first filter core and first filter core casing, the first filter core is placed in the filter core groove of first filter core casing, the upper end of first filter core casing is equipped with the filter lug that extends to its one side and forms, first filter core casing is placed in the mounting groove and the filter lug is located the mounting groove is outside, and first mounting screw is connected with the corresponding screw hole on the guide seat after passing through the through -hole on the filter lug.

[0006] The utility model discloses a quick -detachable four -stage filter oxygen -generating system of aircraft, including gas source subassembly and oxygen concentrator, the gas source subassembly includes gas source casing and is located in the air compressor of gas source casing, the first filter is installed to the position of the air inlet of air compressor on the gas source casing, the oxygen concentrator includes bottom plate and installs molecular sieve cylinder and oxygen storage cylinder on the bottom plate, the air outlet of air compressor is connected with the air inlet of molecular sieve cylinder through air pipe, the oxygen outlet of molecular sieve cylinder is connected with the air inlet of oxygen storage cylinder through oxygen pipe, the second filter is installed in molecular sieve cylinder, the guide seat is installed to the position of the first filter on the gas source casing, the mounting groove of upper end opening is equipped on the guide seat, the first filter includes first filter core and first filter core casing, the first filter core is placed in the filter core groove of first filter core casing, the upper end of first filter core casing is equipped with the filter lug that extends to its one side and forms, first filter core casing is placed in the mounting groove and the filter lug is located the mounting groove is outside, and first mounting screw is connected with the corresponding screw hole on the guide seat after passing through the through -hole on the filter lug.

[0007] The utility model discloses a quick -detachable four -stage filter oxygen -generating system of aircraft, including gas source subassembly and oxygen concentrator, the gas source subassembly includes gas source casing and is located in the air compressor of gas source casing, the first filter is installed to the position of the air inlet of air compressor on the gas source casing, the oxygen concentrator includes bottom plate and installs molecular sieve cylinder and oxygen storage cylinder on the bottom plate, the air outlet of air compressor is connected with the air inlet of molecular sieve cylinder through air pipe, the oxygen outlet of molecular sieve cylinder is connected with the air inlet of oxygen storage cylinder through oxygen pipe, the second filter is installed in molecular sieve cylinder, the guide seat is installed to the position of the first filter on the gas source casing, the mounting groove of upper end opening is equipped on the guide seat, the first filter includes first filter core and first filter core casing, the first filter core is placed in the filter core groove of first filter core casing, the upper end of first filter core casing is equipped with the filter lug that extends to its one side and forms, first filter core casing is placed in the mounting groove and the filter lug is located the mounting groove is outside, and first mounting screw is connected with the corresponding screw hole on the guide seat after passing through the through -hole on the filter lug.

[0008] As preferred, in order to further improve the dismounting efficiency of the first filter and the base, a section of the stud of the first mounting screw and the second mounting screw near the suspended end portion is respectively sleeved with a screw sleeve that cannot rotate relatively, an outer thread is arranged on the circumferential outer wall of the screw sleeve, the hole diameter of the through hole on the filter lug for the first mounting screw to pass through is greater than the outer diameter of the stud of the first mounting screw, and an end of the through hole near the nut of the first mounting screw is provided with a first boss for blocking the corresponding screw sleeve from coming out, the hole diameter of the through hole on the base lug for the second mounting screw to pass through is greater than the outer diameter of the stud of the second mounting screw, and an end of the through hole near the nut of the second mounting screw is provided with a second boss for blocking the corresponding screw sleeve from coming out.

[0009] As preferred, in order to further improve the dismounting efficiency of the first filter and the base, a bushing is installed between the nut of the first mounting screw and the filter lug and between the nut of the second mounting screw and the base lug, and a compression spring is installed in the center through hole of the bushing, and the stud of the first mounting screw and the stud of the second mounting screw pass through the center through hole of the corresponding compression spring.

[0010] As preferred, in order to further improve the dismounting efficiency of the first filter, the slot wall surface of the mounting slot is wedge-shaped, and the upper end width of the mounting slot is greater than the lower end width.

[0011] As preferred, in order to further improve the mounting efficiency of the base, a plurality of guide blocks are installed on the base plate at positions outside the base, the side surface of the guide block close to the base is gradually inclined downward to form an inclined surface, and the surface of the guide block close to the base below the inclined surface is a vertical plane.

[0012] As preferred, in order to improve the filtering effect of the third filter, the third filter comprises a filter shell, a third filter element and a third filter element housing, the third filter element is placed in the third filter element housing with a porous structure, the third filter element housing is placed in the filter shell, the upper end of the filter shell is provided with an air inlet as the air inlet of the third filter, the lower end of the filter shell is provided with an air outlet as the air outlet of the third filter, the upper end of the third filter element housing is provided with an upper sealing cover, and the lower end of the third filter element housing is open.

[0013] As preferred, in order to improve the filtering effect of the fourth filter, the fourth filter comprises a fourth filter element and a fourth filter element housing, the fourth filter element is placed in the fourth filter element housing with a porous structure, the upper end of the fourth filter element housing is open, the lower end of the fourth filter element housing is provided with a lower sealing cover, the upper end of the oxygen storage cylinder is provided with an upper end cover, and the lower end of the oxygen storage cylinder is provided with a lower end cover, the upper end cover of the oxygen storage cylinder is provided with an oxygen inlet as the inlet of the oxygen storage cylinder, and the lower end cover of the oxygen storage cylinder is provided with an oxygen outlet as the outlet of the oxygen storage cylinder.

[0014] The beneficial effects of the utility model lie in:

[0015] The utility model discloses a third filter and fourth filter for filtering air into the molecular sieve cylinder and filtering oxygen in the oxygen storage cylinder are added in the oxygen concentrator, four-stage filtering and purifying functions are realized, the cleanliness of the oxygen output by the oxygen storage cylinder is improved obviously, and the oxygen inhalation safety of the oxygen inhalation personnel is better ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the three -dimensional view of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0017] Figure 2 is the partial three -dimensional view of first filter and the associated structure of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0018] Figure 3 is the three -dimensional view of guide block of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0019] Figure 4 is the three -dimensional view of base of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0020] Figure 5 is the partial sectional view of second mounting screw and base and bottom plate connection of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0021] Figure 6 is the main view sectional view of third filter of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0022] Figure 7 is the main view sectional view of molecular sieve cylinder of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system;

[0023] Figure 8 is the main view sectional view of oxygen storage cylinder of quick -release four -stage filter aircraft -borne oxygen -generating system of the utility model discloses a quick -release four -stage filter aircraft -borne oxygen -generating system. DETAILED DESCRIPTION

[0024] The utility model will be further described in connection with the drawings:

[0025] As Figures 1-8The utility model discloses a quick detachable four-stage filter oxygen generation system on aircraft, including gas source subassembly and oxygen concentrator, the gas source subassembly includes gas source casing 1 and is located in the air compressor (in the invisible in drawing) of gas source casing 1, the first filter 4 is installed to the position of the air inlet of air compressor on gas source casing 1, the oxygen concentrator includes bottom plate 13 and installs molecular sieve cylinder 6 and oxygen storage cylinder 11 on bottom plate 13, the air outlet of air compressor is connected with the air inlet of molecular sieve cylinder 6 through air pipe 2, the oxygen outlet of molecular sieve cylinder 6 is connected with the air inlet of oxygen storage cylinder 11 through oxygen pipe 7, and the second filter is installed in molecular sieve cylinder 6, the position corresponding with first filter 4 is installed with guide seat 3 on gas source casing 1, and the mounting groove (in the invisible in drawing) of upper end opening is equipped with on guide seat 3, first filter 4 includes first filter core 18 and first filter core casing 17, and first filter core 18 is placed in the filter core groove of first filter core casing 17, the opposite sides of the filter core groove are both open, do not affect the air from first filter core 18, the upper end of first filter core casing 17 is equipped with the filter lug 15 formed to the side extension thereof, first filter core casing 17 is placed in the mounting groove and the filter lug 15 is located in the mounting groove, and first mounting screw 14 is connected with the corresponding screw hole on guide seat 3 after passing through the through hole on filter lug 15, the upper end of first filter core casing 17 is also equipped with the handle 16 extending upwards, and the through hole for hand holding is equipped with on handle 16, the oxygen concentrator still includes base 10, third filter 5 and fourth filter, base 10 is installed on bottom plate 13, molecular sieve cylinder 6, oxygen storage cylinder 11 and third filter 5 are installed on base 10 respectively, the edge of base 10 is equipped with a plurality of base lugs 9 formed to the extension of the outside, a plurality of second mounting screws 8 are connected with the corresponding screw holes on bottom plate 13 after passing through the through holes on a plurality of base lugs 9 respectively, the air outlet of air compressor is connected with the air inlet of third filter 5 through air pipe 2, and the air outlet of third filter 5 is connected with the air inlet end of molecular sieve cylinder 6, the fourth filter is installed in oxygen storage cylinder 11.

[0026] Explanation: the above-mentioned molecular sieve cylinder 6 is two, also can be one or more, two molecular sieve cylinders 6 circulate oxygen production, nitrogen discharge, can improve oxygen production efficiency, the above-mentioned oxygen pipe is a tee pipe, is used for inputting the oxygen generated by two molecular sieve cylinders 6 into oxygen storage cylinder 11, the above-mentioned bottom plate is integrated bottom plate, is equipped with a plurality of air path channels inside, the above-mentioned base is also equipped with a plurality of channels and respectively with molecular sieve cylinder, oxygen storage cylinder, third filter and bottom plate corresponding docking, this air path structure is the mature structure of prior art, for example, the bottom plate structure in the invention patent application of applicant's application number "202410030135.6" can be referred to, because the air path structure is not the innovative structure of the present application and is not the protection object, so the present application does not carry out the specific description of the air path structure on the bottom plate and base, and the air path structure on the base is the adaptability structure, and there is no problem of being unclear and being unable to implement.

[0027] As Figures 1-8 shown, the utility model discloses the following more optimized specific structure:

[0028] In order to further improve the dismounting efficiency of first filter 4 and base 10, the section of the stud of first mounting screw 14 and second mounting screw 8 close to the overhanging end portion is respectively sleeved with screw sleeve 24 that can not rotate relatively (only need to set the protruding portion on the outer wall of screw sleeve 24 and place in the groove on the corresponding stud to realize this function), the circumferential outer wall of screw sleeve 24 is equipped with external thread, the hole diameter of the through hole (not visible in the drawing) for first mounting screw 14 to pass through on filter lug 15 is greater than the outer diameter of the stud of first mounting screw 14 and the end close to the nut of first mounting screw 14 in the through hole is equipped with first boss (not shown in the drawing) for blocking the corresponding screw sleeve 24 from coming out, the hole diameter of the through hole 21 for second mounting screw 8 to pass through on base lug 9 is greater than the outer diameter of the stud of second mounting screw 8 and the end close to the nut of second mounting screw 8 in the through hole 21 is equipped with second boss (not marked in the drawing) for blocking the corresponding screw sleeve 24 from coming out.

[0029] In order to further improve the dismounting efficiency of first filter 4 and base 10, the nut of first mounting screw 14 and the through hole 21 for second mounting screw 8 to pass through on base lug 9 are respectively equipped with bushing 22 and the center through hole in bushing 22 is installed with compression spring 23, and the stud of first mounting screw 14 and the stud of second mounting screw 8 pass through the center through hole of the corresponding compression spring 23 respectively.

[0030] In order to further improve the dismounting efficiency of first filter 4, the groove wall surface of the mounting groove is wedge-shaped, and the width of the upper end of the mounting groove is greater than the width of the lower end.

[0031] In order to further improve the mounting efficiency of base 10, a plurality of guide blocks 12 are installed on the position of bottom plate 13 outside base 10, the side surface close to base 10 in guide block 12 gradually inclines to form inclined surface 19 towards base 10 from top to bottom, the surface below inclined surface 19 in the side surface close to base 10 in guide block 12 is vertical plane 29, and the transition between inclined surface 19 and vertical plane 29 is smooth.

[0032] In order to improve the filtering effect of the third filter 5, the third filter 5 comprises a filter shell 26, a third filter element 30 and a third filter element shell 29, the third filter element 30 is placed in the third filter element shell 29 with a porous structure, the third filter element shell 29 is placed in the filter shell 26, the upper end of the filter shell 26 is provided with an air inlet 25 which serves as the air inlet of the third filter 5, the lower end of the filter shell 26 is provided with an air outlet 31 which serves as the air outlet of the third filter 5, the upper end of the third filter element shell 29 is provided with an upper sealing cover 27, the lower end of the third filter element shell 29 is open, and the air passage 28 is formed between the outer wall of the third filter element shell 29 and the inner wall of the filter shell 26.

[0033] In order to improve the filtering effect of the fourth filter, the fourth filter comprises a fourth filter element 43 and a fourth filter element shell 42, the fourth filter element 43 is placed in the fourth filter element shell 42 with a porous structure, the upper end of the fourth filter element shell 42 is open, the lower end of the fourth filter element shell 42 is provided with a lower sealing cover 45, the upper end of the oxygen storage cylinder 11 is provided with an upper end cover 41, the lower end of the oxygen storage cylinder 11 is provided with a lower end cover 47, the oxygen inlet 40 is provided on the upper end cover 41 and serves as the air inlet of the oxygen storage cylinder 11, the oxygen outlet 46 is provided on the lower end cover 47 and serves as the air outlet of the oxygen storage cylinder 11, and the oxygen passage 44 is formed between the outer wall of the fourth filter element shell 42 and the inner wall of the oxygen storage cylinder 11.

[0034] Figure 7 The structure of the second filter is also shown in the figure, which comprises a filter cotton 36, a filter screen 35 and a hole plate 34, the lower end of the molecular sieve cylinder 6 is provided with a lower end cover 39, the molecular sieve inlet 38 is provided on the lower end cover 39 and serves as the air inlet of the molecular sieve cylinder 6, the upper end of the molecular sieve cylinder 6 is provided with an upper end cover 33, the molecular sieve outlet 32 is provided on the upper end cover 33 and serves as the air outlet of the molecular sieve cylinder 6, the molecular sieve 37 is filled in the molecular sieve cylinder 6, and the filter cotton 36, the filter screen 35 and the hole plate 34 are sequentially installed between the upper surface of the molecular sieve 37 and the upper end cover 33 and between the lower surface of the molecular sieve 37 and the lower end cover 39, respectively.

[0035] As Figures 1-8As shown, when oxygen is produced, the ambient air first enters the air compressor through the first filter 4, the high-pressure air after being pressurized enters the third filter 5 through the air pipe 2, the filtered high-pressure air enters the molecular sieve cylinder 6, first passes through the lower part of the second filter, then passes through the molecular sieve 37 to produce oxygen after denitrification, the oxygen passes through the upper part of the second filter and then enters the oxygen storage cylinder 11 through the oxygen pipe 7, and the oxygen after being filtered by the fourth filter is output from the gas outlet of the oxygen storage cylinder 11 to the oxygen inhalation equipment or the oxygen concentration adjusting equipment, and the four-stage filtration can significantly improve the cleanliness of the output oxygen. When the filter elements of the four filters need to be cleaned or replaced, the first filter 4 and the base 10 can be quickly removed by dismounting the first mounting screw 14 and the second mounting screw 8, the second filter, the third filter 5 and the fourth filter are integrated on the base 10, so that the four filters can be quickly dismounted; after the filter element cleaning or replacement is completed, the first filter 4 and the base 10 are mounted on the gas source shell 1 and the bottom plate 13 through the first mounting screw 14 and the second mounting screw 8 respectively, so that the installation of the four filters is completed, which is very fast and convenient.

[0036] The above embodiments are only preferred embodiments of the present application, and are not a limitation on the technical solutions of the present application. Any technical solution that can be realized on the basis of the above embodiments without creative labor should be considered to fall within the protection scope of the present application.

Claims

1. A quick-release four-stage filtering on-board oxygen generation system, comprising a gas source assembly and an oxygen concentrator, the gas source assembly comprising a gas source housing and an air compressor arranged in the gas source housing, a first filter being arranged on the gas source housing near an air inlet of the air compressor, the oxygen concentrator comprising a bottom plate and a molecular sieve cartridge and an oxygen storage cartridge arranged on the bottom plate, an air outlet of the air compressor being connected to an air inlet of the molecular sieve cartridge through an air pipe, an oxygen outlet of the molecular sieve cartridge being connected to an air inlet of the oxygen storage cartridge through an oxygen pipe, a second filter being arranged in the molecular sieve cartridge, characterized in that: The air source shell is provided with a guide seat at a position corresponding to the first filter, and the guide seat is provided with an installation slot with an open upper end. The first filter comprises a first filter core and a first filter core shell. The first filter core is arranged in a filter core slot of the first filter core shell. An upper end of the first filter core shell is provided with a filter lug extending to one side thereof. The first filter core shell is arranged in the installation slot, and the filter lug is located outside the installation slot. A first installation screw is connected with a corresponding screw hole of the guide seat after passing through a through hole in the filter lug.

2. The quick-release four-stage on-board oxygen generation system of claim 1, wherein: The oxygen concentrator further comprises a base, a third filter and a fourth filter. The base is arranged on the bottom plate. The molecular sieve cylinder, the oxygen storage cylinder and the third filter are arranged on the base. The edge of the base is provided with a plurality of base lugs extending outward. A plurality of second installation screws are connected with corresponding screw holes of the bottom plate after passing through through holes in the plurality of base lugs.

3. The quick-release four-stage on-board oxygen generation system of claim 2, wherein: A non-rotatable screw sleeve is sleeved on a section of the shank of the first installation screw and the second installation screw close to the suspended end portion. An outer thread is arranged on the circumferential outer wall of the screw sleeve. The diameter of the through hole in the filter lug for the first installation screw to pass through is greater than the outer diameter of the shank of the first installation screw. A first boss is arranged in the through hole close to the nut of the first installation screw to block the corresponding screw sleeve from being pulled out. The diameter of the through hole in the base lug for the second installation screw to pass through is greater than the outer diameter of the shank of the second installation screw. A second boss is arranged in the through hole close to the nut of the second installation screw to block the corresponding screw sleeve from being pulled out.

4. The quick-release four-stage on-board oxygen generation system of claim 1, wherein: A bushing is arranged between the nut of the first installation screw and the filter lug and between the nut of the second installation screw and the base lug. A compression spring is arranged in the central through hole of the bushing.

5. The quick-release four-stage on-board oxygen generation system of claim 1, wherein: The slot wall surface of the installation slot is wedge-shaped, and the upper end of the installation slot is wider than the lower end. A plurality of guide blocks are arranged on the bottom plate outside the base. The side surface of the guide block close to the base gradually inclines downward to the direction close to the base to form an inclined surface. The surface of the side surface of the guide block close to the base below the inclined surface is a vertical plane.

6. The quick-release four-stage on-board oxygen generation system of any of claims 1-5, wherein: The third filter comprises a filter shell, a third filter element and a third filter element shell, the third filter element is placed in the third filter element shell with a porous structure, the third filter element shell is placed in the filter shell, the upper end of the filter shell is provided with an air inlet as the air inlet of the third filter, the lower end of the filter shell is provided with an air outlet as the air outlet of the third filter, the upper end of the third filter element shell is provided with an upper sealing cover, and the lower end of the third filter element shell is open.

7. The quick-release four-stage on-board oxygen generation system of any of claims 1-5, wherein: The fourth filter comprises a fourth filter element and a fourth filter element shell, the fourth filter element is placed in the fourth filter element shell with a porous structure, the upper end of the fourth filter element shell is open, the lower end of the fourth filter element shell is provided with a lower sealing cover, the upper end of the oxygen storage cylinder is provided with an upper end cover, the lower end of the oxygen storage cylinder is provided with a lower end cover, the upper end cover of the oxygen storage cylinder is provided with an oxygen inlet as the air inlet of the oxygen storage cylinder, and the lower end cover of the oxygen storage cylinder is provided with an oxygen outlet as the air outlet of the oxygen storage cylinder.

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