Chemical oxygen generator with double-layer shell structure

Abstract

The utility model discloses a chemical oxygen generator with a double-layer shell structure. The chemical oxygen generator comprises a percussion mechanism, an outer shell, an inner shell, an oxygen production flux core, a heat insulation layer, a filter layer and a metal limiting partition plate, the metal limiting partition plate is installed in the shell and divides an inner cavity of the shell into an upper cavity and a lower cavity. The filter layer is filled in the lower cavity of the shell; the inner shell is mounted in the upper cavity of the outer shell; the outer side face of the inner shell is coated with one or two heat insulation layers, and the outer top face and the outer bottom face of the inner shell are each coated with one heat insulation layer. The oxygen-producing flux core is composed of one or more oxygen-producing flux blocks, the oxygen-producing flux core is installed in the inner shell, and the outer side face of the oxygen-producing flux core is also coated with a heat insulation layer; the firing mechanism penetrates through the outer shell and the inner shell, is in contact with the oxygen production flux core and is used for igniting the oxygen production flux core; according to the chemical oxygen generator, the number of wrapping layers of the heat insulation layer can be reduced, heat transfer of the oxygen production flux core is enhanced, and the temperature of the chemical oxygen generator shell is reduced while no matched device is introduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical reaction equipment, and particularly relates to a chemical oxygen generator with a double-layer shell structure. Background Technique

[0002] A chemical oxygen generator is a chemical oxygen supply device, which is usually composed of multiple components such as an ignition device, a shell, an oxygen-producing medicine core, heat-insulating materials, and purification materials. The oxygen-producing medicine core is the core part of the chemical oxygen generator, which is composed of an oxygen-producing source of chlorate or perchlorate, a metal fuel, a catalyst, a chlorine inhibitor, a binder, etc. During the process of heat release and oxygen production by the oxygen-producing source, the heat drives the continuous reaction of the internal oxygen-producing medicine core, and the reaction temperature is maintained at about 300°C for a long time. Through the heat conduction of the heat-insulating material, the metal shell is also in a continuous high-temperature state, generating a large heat load on the surrounding environment, and the high temperature is likely to cause burns to the operator. The continuous high temperature of the outer shell brings many inconveniences and certain safety hazards to the use of the chemical oxygen generator. In order to make the chemical oxygen generator a commonly used oxygen source, reducing the shell temperature of the chemical oxygen generator has become an urgent problem to be solved.

[0003] At present, the research on reducing the outer shell temperature mainly focuses on three aspects: one is to wrap the oxygen-producing medicine core with heat-insulating materials, and the weak heat conduction performance of the heat-insulating materials makes the heat generated by the oxygen-producing source not easily conducted to the outside of the tank body; one is to design the outer shell of the chemical oxygen generator into a jacket structure and add heat-absorbing materials in the jacket; one is to introduce a new protective device with a heat-insulating function structure and place the chemical oxygen generator in the protective device for use.

[0004] Patent CN109336057A discloses that the outer surface of the oxygen-producing core is alternately wrapped with multiple layers of thermal insulation materials such as silica aerogel felt and glass fiber cloth, with at least 4 layers of thermal insulation materials being wrapped, and the wrapping method of the multiple layers of thermal insulation materials plays a role of thermal insulation protection. Since high temperature will be generated during the reaction process, more layers of thermal insulation materials are firmly adhered to the surface of the oxygen-producing core, there is no gas channel, the oxygen flow resistance becomes larger, and the flow is difficult, which is not conducive to the reaction of the oxygen-producing core. The use of thermal insulation materials will occupy the internal space of the oxygen generator, resulting in a significant reduction in the space for purification materials filled around the oxygen-producing core, affecting the purification effect of the gas quality. Chinese patent CN212403460U has heat insulation materials on the outside of the oxygen-producing core and the inner wall of the shell, and the inner wall of the chemical oxygen generator cylinder is provided with a jacket structure, and the jacket structure is filled with one or more combinations of phase change materials HDPE hot melt adhesive powder, LDPE hot melt adhesive powder and PES copolyester hot melt adhesive powder. The shell can be directly touched by human hands, but the outer dimensions and weight of the chemical oxygen generator with the jacket structure will be significantly greater than that of the chemical oxygen generator with a single-layer structure. CN203807161U sets a heat absorption groove between the shell and the oxygen-producing core, and uses the phase change material filled in the heat absorption groove to absorb the heat of the oxygen-producing core to produce phase change, so as to reduce the temperature of the shell and ensure safety performance. In order to prevent heat from overflowing, heat insulation materials are filled around the heat absorption groove. After being heated, the phase change material changes from solid to liquid, and the volume increases and overflows into the containing tank, which invisibly increases the volume of the chemical oxygen generator. In addition, the increase of phase change material allows the heat released by the core to be transferred in time, which may cause the unreacted core to be driven by insufficient heat, resulting in the phenomenon of combustion interruption of the chemical oxygen generator. Patents CN216273105U, CN219836051U and CN218951013U all design a protective device for an oxygen generator, which is used to reduce the temperature of the contactable outer surface. The use of the protective device requires a separate design and production of a device that matches the oxygen generator, which increases the cost and weight of the product as a whole. Utility Model Content

[0005] In view of this, the utility model provides a chemical oxygen generator with a double-layer shell structure, which can reduce the number of wrapping layers of the heat insulation layer, strengthen the heat transfer of the oxygen-producing core, and reduce the shell temperature of the chemical oxygen generator without introducing supporting devices.

[0006] The utility model is realized by the following technical solutions:

[0007] A chemical oxygen generator with a double-layer shell structure, comprising: a firing mechanism, an outer shell, an inner shell, an oxygen-producing core, a heat insulation layer, a filter layer and a metal limiting partition;

[0008] The top of the housing is provided with a mounting hole A, and the bottom of the housing is provided with an exhaust pipe;

[0009] The metal limiting partition is installed inside the housing and divides the inner cavity of the housing into two parts, namely the upper cavity and the lower cavity; the metal limiting partition is a porous structure;

[0010] The filter layer is filled in the lower cavity of the housing;

[0011] The inner housing is installed in the upper cavity of the housing; an installation hole B that is coaxially communicated with the installation hole A of the housing is machined at the top of the inner housing, a plurality of exhaust holes are machined at the bottom of the inner housing, one or two heat insulation layers are coated on the outer side surface of the inner housing, and one heat insulation layer is coated on each of the outer top surface and the outer bottom surface of the inner housing. The heat insulation layer is filled between the outer surface of the inner housing and the inner surface of the upper cavity of the housing;

[0012] The oxygen - generating medicine core is composed of one or more oxygen - generating medicine blocks. The oxygen - generating medicine core is installed inside the inner housing, and one heat insulation layer is also coated on the outer side surface of the oxygen - generating medicine core. The heat insulation layer is filled between the outer side surface of the oxygen - generating medicine core and the inner side surface of the inner housing;

[0013] One end of the firing mechanism passes through the installation hole A of the housing and the installation hole B of the inner housing, and the other end of the firing mechanism is in contact with the oxygen - generating medicine core for igniting the oxygen - generating medicine core. The gas generated by the combustion of the oxygen - generating medicine core is discharged in sequence through the exhaust holes of the inner housing, the metal limiting partition, the filter layer and the exhaust pipe of the housing.

[0014] Further, the housing includes an upper end cover, a housing shell and a lower end cover; the upper end cover and the lower end cover are respectively welded to both ends of the housing shell; the upper end cover is provided with the installation hole A, and the lower end cover is provided with the exhaust pipe;

[0015] The inner housing includes an inner housing top, an inner housing body and an inner housing bottom; both the inner housing top and the inner housing bottom are cylindrical structures with one end open and one end closed; the inner housing body is a cylindrical structure with both ends open, and the open ends of the inner housing top and the inner housing bottom are respectively butted against both ends of the inner housing body;

[0016] On the inner surface of the inner housing body, there are two or more corrugated structures A evenly distributed along the circumferential direction. The length direction of each corrugated structure A is along the axial direction of the inner housing body, the length of each corrugated structure A is equal to the length of the inner housing body, and the top of each corrugated structure A forms an angle of 30° - 45° with the end face of the inner housing body; the bottom of each corrugated structure A is a plane;

[0017] The closed end of the inner housing top is provided with the installation hole B;

[0018] The closed end of the inner housing bottom is provided with the exhaust holes, and a plurality of exhaust holes are evenly distributed; on the inner surface of the inner housing bottom, there are two or more corrugated structures B evenly distributed along the circumferential direction. The length direction of each corrugated structure B is along the axial direction of the inner housing bottom, the top of each corrugated structure B forms an angle of 30° - 45° with the end face of the inner housing bottom; the bottom of each corrugated structure B extends to the closed end of the inner housing bottom;

[0019] More than two corrugated structures A of the inner shell correspond to more than two corrugated structures B of the inner shell bottom one by one, and two or more guiding grooves evenly distributed in the circumferential direction are provided on the outer surface of the oxygen - generating medicine core. The length direction of each guiding groove is arranged along the axial direction of the oxygen - generating medicine core, and the length of each guiding groove is equal to the length of the oxygen - generating medicine core; and two or more guiding grooves are in sliding fit with more than two corrugated structures A of the inner shell or more than two corrugated structures B of the inner shell bottom one by one.

[0020] Furthermore, the metal limiting partition is made of stainless steel, brass or copper.

[0021] Furthermore, the inner shell is fired from kaolin or aluminosilicate at 800°C - 1200°C.

[0022] Furthermore, the heat - insulating layer adopts one or a combination of more of fiberglass blanket, aerogel blanket, and high - silica needled felt.

[0023] Furthermore, the filter layer is composed of an alkali - lime particle filter layer, a heat - insulating layer, a Hopcalite catalyst filter layer, and a copper mesh stacked in sequence.

[0024] Beneficial effects:

[0025] (1) The utility model is provided with a double - layer shell structure, that is, including an inner shell and an outer shell. The oxygen - generating medicine core is encapsulated in the inner shell, which can prevent the oxygen - generating medicine core from burning violently and burning through the shell, improving the safety performance of the chemical oxygen generator. Moreover, the inner shell can be recycled, achieving the purpose of saving production costs; in addition, one or two heat - insulating layers are coated on the outer side of the inner shell, and one heat - insulating layer is coated on the outer side of the oxygen - generating medicine core. The total number of heat - insulating layers is 2 - 3 layers, reducing the number of layers of the heat - insulating layer; and the utility model realizes continuous oxygen supply without filling phase - change materials and without increasing the volume of the chemical oxygen generator, and the temperature of the shell is not greater than 55°C, and the human hand can touch it briefly.

[0026] (2) The inner shell of the utility model is provided with a corrugated structure, and the oxygen - generating medicine core is provided with guiding grooves. The setting of the guiding grooves and the corrugated structure not only facilitates the oxygen - generating medicine core to enter the inner shell, but also generates a gas - flow space, strengthening the heat transfer of the oxygen - generating medicine core.

[0027] (3) The inner shell of the utility model is made of kaolin or aluminosilicate, which plays a role in heat insulation and heat preservation, is light in weight, and effectively reduces the temperature of the shell of the chemical oxygen generator. Description of the drawings

[0028] Figure 1 It is the overall structure diagram of the chemical oxygen generator;

[0029] Figure 2 It is the structural schematic diagram of the inner shell;

[0030] Figure 3 Schematic diagram of the inner shell top structure;

[0031] Figure 4 Schematic diagram of the inner shell bottom structure;

[0032] Among them, 1 - firing mechanism; 2 - upper end cover; 3 - outer shell housing; 4 - lower end cover; 5 - heat insulation layer; 6 - inner shell top; 7 - oxygen - generating medicine core; 8 - inner shell body; 9 - inner shell bottom; 10 - metal limiting partition board; 11 - filter layer. Detailed implementation mode

[0033] The following combines with the attached drawings and gives examples to describe the present utility model in detail.

[0034] Example 1:

[0035] This example provides a chemical oxygen generator with a double - layer shell structure. Refer to the attached drawings Figure 1 , including: firing mechanism 1, outer shell, inner shell, oxygen - generating medicine core 7, heat insulation layer 5, filter layer 11 and metal limiting partition board 10;

[0036] The top of the outer shell is provided with an installation hole A, and the bottom of the outer shell is provided with an exhaust pipe;

[0037] The metal limiting partition board 10 is installed in the outer shell and divides the inner cavity of the outer shell into two parts, namely the upper cavity and the lower cavity; the metal limiting partition board 10 is a porous structure, and the material of the metal limiting partition board 10 is one of stainless steel, brass and red copper. In this example, it is red copper;

[0038] The filter layer 11 is filled in the lower cavity of the outer shell, and the filter layer 11 is fixed by the metal limiting partition board 10;

[0039] The inner shell is installed in the upper cavity of the outer shell; an installation hole B coaxial with the installation hole A of the outer shell is processed at the top of the inner shell, and a plurality of exhaust holes are processed at the bottom of the inner shell. The outer surface of the inner shell is coated with a heat insulation layer 5 (the outer surface of the inner shell includes the outer side surface, outer top surface and outer bottom surface of the inner shell), and the heat insulation layer 5 is filled between the outer surface of the inner shell and the inner surface of the upper cavity of the outer shell (the inner surface of the upper cavity includes the inner side surface, inner top surface of the outer shell and the upper surface of the metal limiting partition board 10); among them, one or two layers of heat insulation layer 5 are coated on the outer side surface of the inner shell, and one layer of heat insulation layer 5 is coated on each of the outer top surface and outer bottom surface of the inner shell;

[0040] The oxygen - generating medicine core 7 is composed of one or more oxygen - generating medicine blocks. The oxygen - generating medicine core 7 is installed in the inner shell, and a layer of heat insulation layer 5 is also coated on the outer side surface of the oxygen - generating medicine core 7, and the heat insulation layer 5 is filled between the outer side surface of the oxygen - generating medicine core 7 and the inner side surface of the inner shell;

[0041] One end of the firing mechanism 1 passes through the mounting hole A of the outer shell and the mounting hole B of the inner shell, and the other end of the firing mechanism 1 is in contact with the oxygen-producing medicine core 7 for igniting the oxygen-producing medicine core 7. The gas generated by the combustion of the oxygen-producing medicine core 7 is discharged through the exhaust hole of the inner shell, the metal limit partition 10, the filter layer 11 and the exhaust pipe of the outer shell in sequence.

[0042] Among them, the outer shell is a split structure, including an upper end cover 2, an outer shell body 3 and a lower end cover 4; the upper end cover 2 and the lower end cover 4 are respectively welded to both ends of the outer shell body 3; the upper end cover 2 is provided with the mounting hole A, and the lower end cover 4 is provided with the exhaust pipe;

[0043] The inner shell is fired from kaolin or aluminosilicate at 800°C - 1200°C, and includes an inner shell top 6, an inner shell body 8 and an inner shell bottom 9; both the inner shell top 6 and the inner shell bottom 9 are cylindrical structures with one end open and one end closed; the inner shell body 8 is a cylindrical structure with both ends open, and the open ends of the inner shell top 6 and the inner shell bottom 9 are respectively butted against both ends of the inner shell body 8;

[0044] See attached Figure 2 , two or more corrugated structures A are evenly distributed on the inner surface of the inner shell body 8 in the circumferential direction. The length direction of each corrugated structure A is arranged along the axial direction of the inner shell body 8, and the length of each corrugated structure A is equal to the length of the inner shell body 8. The top of each corrugated structure A (the top is the connection part of the inner shell body 8 and the inner shell top 6) forms an angle of 30° - 45° with the end face of the inner shell body 8; the bottom of each corrugated structure A (the bottom is the connection part of the inner shell body 8 and the inner shell bottom 9) is a plane;

[0045] See attached Figure 3 , the closed end of the inner shell top 6 is provided with the mounting hole B;

[0046] See attached Figure 4 , the closed end of the inner shell bottom 9 is provided with the exhaust hole, and a number of exhaust holes are evenly distributed; two or more corrugated structures B are evenly distributed on the inner surface of the inner shell bottom 9 in the circumferential direction. The length direction of each corrugated structure B is arranged along the axial direction of the inner shell bottom 9. The top of each corrugated structure B (the top is the connection part of the inner shell bottom 9 and the inner shell body 8) forms an angle of 30° - 45° with the end face of the inner shell bottom 9; the bottom of each corrugated structure B extends to the closed end of the inner shell bottom 9;

[0047] More than two corrugated structures A of the inner shell 8 correspond to more than two corrugated structures B of the inner shell bottom 9 one by one. The outer surface of the oxygen - generating medicine core 7 is provided with more than two guiding grooves evenly distributed along the circumferential direction. The length direction of each guiding groove is arranged along the axial direction of the oxygen - generating medicine core 7, and the length of each guiding groove is equal to the length of the oxygen - generating medicine core 7. More than two guiding grooves are in sliding fit with more than two corrugated structures A of the inner shell 8 or more than two corrugated structures B of the inner shell bottom 9 one by one. The arrangement of the guiding grooves and the corrugated structures facilitates the entry of the oxygen - generating medicine core 7 into the inner shell. Among them, the guiding groove is a groove with a depth of 2 mm, a width of 1 mm, and a triangular cross - section.

[0048] The outer surface of the firing mechanism 1 is coated with sodium silicate inorganic glue. The firing mechanism 1 is adhesively bonded in the mounting hole A of the upper cover 2 and the mounting hole B of the inner shell top 6.

[0049] The heat - insulating layer 5 adopts one or a combination of glass fiber blanket, aerogel blanket, and high - silica needle felt. In this embodiment, high - silica needle felt is adopted.

[0050] The filter layer 11 is composed of an alkali - lime particle filter layer, a heat - insulating layer, a Hopcalite catalyst filter layer, and a copper mesh stacked in sequence.

[0051] Embodiment 2:

[0052] On the basis of Embodiment 1, the inner shell of this embodiment is fired from kaolin at 800 °C. The corrugated structure A of the inner shell 8 and the corrugated structure B of the inner shell bottom 9 both adopt three. The corresponding guiding grooves of the oxygen - generating medicine core 7 adopt three. The top of each corrugated structure A forms an angle of 30° with the end face of the inner shell 8. The top of each corrugated structure B forms an angle of 30° with the end face of the inner shell bottom 9. The oxygen - generating medicine core 7 adopts 1 oxygen - generating medicine block. The outer side of the inner shell is coated with a heat - insulating layer 5.

[0053] The chemical oxygen generator with a double - layer shell structure is tested for oxygen - generating performance through a gas on - line detection device (publication number: CN109682418A). The temperature of the chemical oxygen generator shell is detected by a JK - 32U multi - channel temperature patrol instrument. Three thermocouples are successively fixed on the surface of the outer shell 3 of the chemical oxygen generator. The positions of the three thermocouples are 4 cm from the top of the outer shell 3, at the middle position of the outer shell 3, and 4 cm from the bottom of the outer shell 3 respectively.

[0054] After the chemical oxygen generator is started, that is, after the firing mechanism 1 ignites the oxygen - generating core 7, the oxygen - generating core 7 does not show the phenomenon of flameout. The heat transfer of the oxygen - generating core 7 is strengthened. And because a heat - insulating layer 5 is coated on the outer side of the inner shell and the outer side of the oxygen - generating core 7 respectively, and the number of layers of the heat - insulating layer is 2 layers, the number of layers of the heat - insulating material in the technology of CN 109336057A is reduced; under the heat - insulating effect of the heat - insulating layer 5, the highest temperatures on the surface of the chemical oxygen generator at 4 cm from the top of the outer shell housing 3, the middle position of the outer shell housing 3, and 4 cm from the bottom of the outer shell housing 3 measured by the thermocouple are 45 °C, 47 °C, and 50 °C respectively.

[0055] Compared with patents CN212403460U, CN203807161U, CN216273105U, CN219836051U, and CN218951013U, without filling phase - change materials and without increasing the volume of the chemical oxygen generator, a chemical oxygen generator with a double - layer shell structure realizes uninterrupted oxygen supply, and the shell temperature does not exceed 50 °C, and a human hand can briefly touch it.

[0056] Example 3:

[0057] Based on Example 1, in this example, the inner shell is fired from kaolin at 1200 °C; both the corrugated structure A of the inner shell body 8 and the corrugated structure B of the inner shell bottom 9 adopt four channels, and the corresponding guiding grooves of the oxygen - generating core 7 adopt four; the top of each corrugated structure A forms a 45° angle with the end face of the inner shell body 8; the top of each corrugated structure B forms a 45° angle with the end face of the inner shell bottom 9; the oxygen - generating core 7 uses 3 oxygen - generating blocks; two layers of heat - insulating layer 5 are coated on the outer side of the inner shell;

[0058] The chemical oxygen generator with a double - layer shell structure is subjected to an oxygen - generation performance test through a gas on - line detection device (publication number: CN109682418A). The temperature of the chemical oxygen generator shell is detected by a JK - 32U multi - channel temperature inspection instrument. Three thermocouples are successively fixed on the surface of the outer shell housing 3 of the chemical oxygen generator. The positions of the three thermocouples are at 4 cm from the top of the outer shell housing 3, the middle position of the outer shell housing 3, and 4 cm from the bottom of the outer shell housing 3 respectively;

[0059] After the chemical oxygen generator is started, that is, after the firing mechanism 1 ignites the oxygen - generating core 7, the oxygen - generating core does not go out, the heat transfer of the oxygen - generating core is strengthened, and since there are two heat - insulating layers 5 covering the outer side of the inner shell and one heat - insulating layer 5 covering the outer side of the oxygen - generating core 7, the number of heat - insulating layers is 3 layers, reducing the number of heat - insulating material layers in the technology of CN 109336057A. Under the heat - insulating effect of the heat - insulating layer 5, the highest temperatures on the surface of the chemical oxygen generator at 4 cm from the top of the outer shell housing 3, the middle position of the outer shell housing 3, and 4 cm from the bottom of the outer shell housing 3 measured by the thermocouple are 51 °C, 52 °C, and 55 °C respectively.

[0060] Compared with patents CN212403460U, CN203807161U, CN216273105U, CN219836051U, and CN218951013U, without filling phase - change materials and without increasing the volume of the chemical oxygen generator, a chemical oxygen generator with a double - layer shell structure realizes uninterrupted oxygen supply, and the shell temperature is not greater than 55 °C, and a person's hand can briefly touch it.

[0061] In summary, the above are only the preferred embodiments of the present utility model and are not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A chemical oxygen generator with a double-layer shell structure, characterized in that: include: Firing mechanism, outer shell, inner shell, oxygen-generating core, heat insulation layer, filter layer and metal limiting partition; The top of the housing is provided with a mounting hole A, and the bottom of the housing is provided with an exhaust pipe; The metal limit partition is installed in the shell and divides the inner cavity of the shell into two parts, namely an upper cavity and a lower cavity; the metal limit partition is a porous structure; The filter layer is filled in the lower cavity of the housing; The inner shell is installed in the upper cavity of the outer shell; the top of the inner shell is processed with a mounting hole B coaxially connected with the mounting hole A of the outer shell, the bottom of the inner shell is processed with a plurality of exhaust holes, the outer side of the inner shell is covered with one or two layers of heat insulation layer, the outer top surface and the outer bottom surface of the inner shell are each covered with a layer of heat insulation layer, and the heat insulation layer is filled between the outer surface of the inner shell and the inner surface of the upper cavity of the outer shell; The oxygen-generating medicine core is composed of one or more oxygen-generating medicine blocks, and the oxygen-generating medicine core is installed in the inner shell. The outer side of the oxygen-generating medicine core is also covered with a heat-insulating layer, and the heat-insulating layer is filled between the outer side of the oxygen-generating medicine core and the inner side of the inner shell; One end of the firing mechanism passes through the mounting hole A of the outer shell and the mounting hole B of the inner shell, and the other end of the firing mechanism contacts the oxygen-producing core to ignite the oxygen-producing core. The gas generated by the combustion of the oxygen-producing core is discharged in sequence through the exhaust hole of the inner shell, the metal limiting baffle, the filter layer and the exhaust pipe of the outer shell.

2. A chemical oxygen generator with a double-layer shell structure as claimed in claim 1, characterized in that: The outer shell comprises an upper end cover, an outer shell body and a lower end cover; the upper end cover and the lower end cover are respectively welded to the two ends of the outer shell body; the upper end cover is provided with the mounting hole A, and the lower end cover is provided with the exhaust pipe; The inner shell comprises an inner shell top, an inner shell and an inner shell bottom; the inner shell top and the inner shell bottom are both cylindrical structures with one end open and the other end closed; the inner shell is a cylindrical structure with two ends open, and the open ends of the inner shell top and the inner shell bottom are respectively connected to the two ends of the inner shell; The inner surface of the inner shell is provided with two or more corrugated structures A evenly distributed along the circumferential direction, the length direction of each corrugated structure A is arranged along the axial direction of the inner shell, the length of each corrugated structure A is equal to the length of the inner shell, the top of each corrugated structure A is 30° to 45° with the end face of the inner shell; the bottom of each corrugated structure A is a plane; The closed end of the inner shell top is provided with the mounting hole B; The closed end of the inner shell bottom is provided with the exhaust holes, and the exhaust holes are evenly distributed; the inner surface of the inner shell bottom is provided with two or more corrugated structures B evenly distributed along the circumferential direction, the length direction of each corrugated structure B is arranged along the axial direction of the inner shell bottom, and the top of each corrugated structure B is 30° to 45° with the end face of the inner shell bottom; the bottom of each corrugated structure B extends to the closed end of the inner shell bottom; The positions of the more than two corrugated structures A of the inner shell body correspond one to one with the positions of the more than two corrugated structures B of the inner shell bottom, and the outer surface of the oxygen-generating core is provided with more than two guide grooves evenly distributed along the circumferential direction, and the length direction of each guide groove is arranged along the axial direction of the oxygen-generating core, and the length of each guide groove is equal to the length of the oxygen-generating core; and the more than two guide grooves are slidably matched with the more than two corrugated structures A of the inner shell body or the more than two corrugated structures B of the inner shell bottom in one-to-one correspondence.

3. A chemical oxygen generator with a double-layer shell structure as claimed in claim 1, characterized in that: The metal limiting partition is made of stainless steel, brass or copper.

4. A chemical oxygen generator with a double-layer shell structure as claimed in claim 1, characterized in that: The inner shell is made of kaolin or alumina silicate by firing at 800°C-1200°C.

5. The chemical oxygen generator with a double-layer shell structure as claimed in claim 1, characterized in that: The heat insulation layer is made of one of glass fiber blanket, aerogel felt and high silica needle felt.

6. A chemical oxygen generator with a double-layer shell structure as claimed in any one of claims 1 to 5, characterized in that: The filter layer is composed of a soda lime particle filter layer, a heat insulation layer, a hopcalite catalyst filter layer and a copper mesh stacked in sequence.

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