Space-saving chemical oxygen generator

Abstract

This utility model relates to the field of oxygen generation technology, specifically disclosing a space-saving chemical oxygen generator, including a cylinder and an integrated end cap at its end. The end cap is also equipped with a starting mechanism, a pressure relief valve, and a gas outlet, significantly reducing the axial height of the device. A bell jar is fixed to the bottom of the starting mechanism and built into the cylinder. An annular filter is coaxially sleeved on the outside of the bell jar, and its annular cavity is filled with filter reagent. An oxygen candle is placed inside the bell jar, and its outer surface is covered by a heat-insulating and breathable layer that is fixed to the inner wall of the bell jar. The axial height of the heat-insulating and breathable layer is greater than the axial height of the bell jar, forming a gas channel. The gas produced after the oxygen candle burns flows downwards from the heat-insulating and breathable layer, naturally forming a gap channel through the height difference between it and the bell jar, penetrating to the bottom of the annular filter, and then flowing upwards through the filter reagent layer to complete the purification reaction.

Description

Technical Field

[0001] This utility model relates to the field of oxygen generation technology, specifically to a space-saving chemical oxygen generator. Background Technology

[0002] Existing chemical oxygen generators such as Figure 1 As shown, it typically consists of an oxygen candle 8, a starting mechanism 3, a heat insulation layer 9, a filter assembly 7, a pressure relief valve 4, an exhaust nozzle 5, and a housing 1. The oxygen candle 8 is mostly cylindrical or cuboid in shape. After its end is ignited by the starting mechanism 3, it can continue to burn to the other end.

[0003] The core function of filter assembly 7 is to remove harmful gases such as carbon monoxide, carbon dioxide, and chlorine produced by the combustion of oxygen candle 8. Traditional designs place filter assembly 10 at the tail end of the propellant column, necessitating the placement of pressure relief valve 4 and outlet nozzle 5 there as well. This not only occupies more space axially but also significantly reduces the filtration efficiency of impurity gases because the catalytic activity of the core filter material, hogalat, is highly temperature-dependent—its efficient carbon monoxide conversion requires temperatures above 80°C, while the internal temperature of the oxygen generator during initial startup is typically below this value. To meet gas concentration limits, compensation can only be achieved by increasing the dosage of filter media, which in turn significantly increases the equipment size.

[0004] How to optimize the structure to efficiently utilize the heat from the oxygen candle to activate the filter material while minimizing space usage, thereby overcoming the contradiction between volume and filtration efficiency, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To achieve the goal of this invention—reducing space occupation while efficiently utilizing the heat of the oxygen candle to activate the filter material—this application provides a space-saving chemical oxygen generator, comprising:

[0006] cylindrical body;

[0007] An integrated end cap is located at one end of the cylinder, and the integrated end cap is equipped with a starting mechanism, a pressure relief valve and an air outlet.

[0008] A bell jar is fixed to the bottom of the starting mechanism, and the bell jar is located inside the cylinder;

[0009] An annular filter coaxially sleeved outside the bell jar, the annular filter being filled with a filter agent;

[0010] An oxygen candle is disposed inside the bell jar, and the outer surface of the oxygen candle is covered with a heat-insulating and breathable layer, which is fixedly connected to the inner wall of the bell jar; the axial height of the heat-insulating and breathable layer is greater than the axial height of the bell jar.

[0011] In some specific embodiments, the annular filter includes:

[0012] An annular cylindrical body is fixedly fitted onto the outside of the bell jar;

[0013] The upper cover plate and the lower cover plate are respectively sealed and fixed to the top and bottom of the annular cylinder;

[0014] Both the upper and lower cover plates are provided with ventilation holes that penetrate their thickness.

[0015] In some specific embodiments, the heat-insulating and breathable layer is composed of a ceramic fiber cotton layer and a ceramic fiber cloth layer covering the outside of it.

[0016] In some specific embodiments, a support structure is provided between the heat-insulating and breathable layer and the inner wall of the bell jar.

[0017] In some specific embodiments, the filtering agent is hogalat.

[0018] In some specific embodiments, the cylinder and the integrated end cap are fixedly connected by welding.

[0019] The beneficial effects of the above technical solution are as follows:

[0020] This invention breaks through the spatial limitations of traditional axial series layouts, achieving a significant reduction in the axial dimensions of the equipment. Utilizing the axial ventilation channel formed by the height difference between the heat-insulating and breathable layer and the bell jar, combined with the enhanced radial heat transfer efficiency unique to the nested structure, a dual-effect thermal activation mechanism is successfully established: on the one hand, high-temperature gas is guided directly to the bottom area of ​​the filter; on the other hand, the heat conduction efficiency of the oxygen candle in the radial dimension is enhanced, enabling the filter agent to reach the critical temperature for catalytic reaction in a very short time, fundamentally overcoming the deficiency of insufficient low-temperature activity in the prior art.

[0021] The radial spatial extension of the filter assembly effectively increases the volume of its chemical chamber, while the revolutionary breakthrough in thermal activation efficiency significantly reduces the amount of reagent required per unit of filtration efficiency, achieving a breakthrough balance between volume compression and filtration efficiency. The coaxial nesting design of the bell and filter, combined with the radial constraint of the inner wall of the cylinder, forms a multi-stage stable structure resistant to mechanical shock, greatly improving the operational reliability of the equipment under extreme conditions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a chemical oxygen generator provided for the prior art;

[0024] Figure 2 This is a schematic diagram of a space-saving chemical oxygen generator provided in one embodiment of the present invention.

[0025] The components include: 1. cylinder; 2. end cap; 3. starting mechanism; 4. pressure relief valve; 5. air outlet; 6. bell jar; 7. annular filter; 8. oxygen candle; 9. heat insulation and breathable layer; and 10. filter assembly. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] This utility model provides a space-saving chemical oxygen generator, comprising a cylinder 1 and an integrated end cap 2 at its end, which are fixedly connected by welding. The end cap 2 is also equipped with a starting mechanism 3, a pressure relief valve 4, and an outlet nozzle 5, significantly reducing the axial height of the device. Its innovative structural layout allows the axial length of the device to be reduced from 200mm in the traditional design to 167mm while maintaining an outer diameter of 70mm. The starting mechanism 3 is compatible with both mechanical triggering and electric ignition modes. A bell jar 6 is fixed to the bottom of the starting mechanism 3 and built into the cylinder 1. An annular filter 7 is coaxially sleeved on the outside of the bell jar 6, and its annular cavity is filled with filter reagent. An oxygen candle 8 is placed inside the bell jar 6, and its outer surface is covered by a heat-insulating and breathable layer 9, which is fixed to the inner wall of the bell jar 6. The axial height of the heat-insulating and breathable layer 9 is greater than the axial height of the bell jar 6, forming a gas channel.

[0029] Furthermore, the gas produced after the oxygen candle 8 combustion flows downward from the heat-insulating and breathable layer 9, naturally forming a gap channel through the height difference between it and the bell jar 6 to penetrate to the bottom of the annular filter 7, and then passes through the filter agent layer from bottom to top to complete the purification reaction. This flow path innovatively constructs a two-dimensional heat conduction system in the axial and radial directions: the nested structure utilizes the radial heat radiation generated by the combustion of the oxygen candle 8 to continuously act on the entire filter, while the high-temperature airflow transported in the axial gap directly preheats the bottom layer of the agent, allowing the filter material to fully absorb heat energy in the initial stage of the reaction. This not only fundamentally overcomes the defect of low-temperature lag in catalytic activity in traditional designs, but also significantly reduces the amount of agent required per unit of purification through thermal efficiency optimization. At the same time, the coaxial sleeve of the annular filter 7 and the bell jar 6, combined with the rigid constraint of the inner wall of the cylinder 1, constitutes a triple spatial anchoring structure that resists mechanical impact, maintaining continuous operational stability under extreme conditions while compressing the axial dimension of the equipment.

[0030] In a specific embodiment of this utility model, the annular cylinder of the annular filter 7 is fixedly fitted onto the outside of the bell jar 6 with an interference fit. Its upper and lower cover plates are integrated into the top and bottom of the cylinder respectively through continuous sealing welds. Each cover plate has an array of vent holes that penetrate its body. The interference fit and continuous welds form a self-stabilizing structure, eliminating the need for auxiliary connecting parts to occupy additional axial space. The evenly distributed array of vent holes, together with the sealing structure, ensures uniform gas penetration and avoids local compaction failure of the filter agent layer.

[0031] In another specific embodiment of this utility model, the heat-insulating and breathable layer 9 is composed of an inner ceramic fiber cotton matrix and an outer ceramic fiber woven fabric composite, with the two layers forming a continuous coating structure through a high-temperature interface binder. The ceramic fiber woven fabric directionally reflects the high-temperature heat radiation generated by the combustion of the oxygen candle 8, simultaneously maintaining the structural integrity of the composite layer; the unique microporous structure of the fiber cotton matrix provides a continuous gas permeability path for the axial gap, achieving synergistic optimization of heat insulation performance and airflow conduction capability.

[0032] In a preferred embodiment of this invention, a mechanical support structure is provided between the outer wall of the heat-insulating and breathable layer 9 and the inner wall of the bell jar 6. This structure includes a circumferentially distributed metal tube support or an annular metal frame supported by an elastic propellant charge. The outer side of the support forms a radial gap channel with the inner wall of the bell jar 6, while its inner side maintains intermittent contact with the outer wall of the heat-insulating and breathable layer 9, together constructing an axially extended gap through which gas flows.

[0033] In one specific embodiment of this utility model, the filter agent mainly includes hogalat, molecular sieve and sodium hydroxide-hogalat, which respectively treat carbon monoxide, carbon dioxide and chlorine.

[0034] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "example," "specific example," "a specific embodiment," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A space saving chemical oxygen generator, characterised in that, include: Cylinder (1); An integrated end cap (2) is provided at one end of the cylinder (1), and the integrated end cap (2) is equipped with a starting mechanism (3), a pressure relief valve (4) and an air outlet (5). A bell jar (6) is fixed to the bottom of the starting mechanism (3), and the bell jar (6) is located inside the cylinder (1); An annular filter (7) is coaxially sleeved outside the bell jar (6), and the annular filter (7) is filled with a filter agent. An oxygen candle (8) is disposed inside the bell jar (6). The outer surface of the oxygen candle (8) is covered with a heat-insulating and breathable layer (9), and the heat-insulating and breathable layer (9) is fixedly connected to the inner wall of the bell jar (6). The axial height of the heat-insulating and breathable layer (9) is greater than the axial height of the bell jar (6).

2. The space-saving chemical oxygen generator according to claim 1, characterized in that, The annular filter (7) includes: The annular cylindrical body is fixedly fitted onto the outside of the bell jar (6); The upper cover plate and the lower cover plate are respectively sealed and fixed to the top and bottom of the annular cylinder; Both the upper and lower cover plates are provided with ventilation holes that penetrate their thickness.

3. The space-saving chemical oxygen generator according to claim 1, characterized in that, The heat-insulating and breathable layer (9) is composed of a ceramic fiber cotton layer and a ceramic fiber cloth layer covering its exterior.

4. The space-saving chemical oxygen generator according to claim 1, characterized in that, A support structure is provided between the heat insulation and breathable layer (9) and the inner wall of the bell jar (6).

5. The space-saving chemical oxygen generator according to claim 1, characterized in that, The filtering agent is hogalat.

6. The space-saving chemical oxygen generator according to claim 1, characterized in that, The cylindrical body (1) and the integrated end cap (2) are fixedly connected by welding.

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