A solid chemical oxygen generator

Abstract

This utility model relates to a solid chemical oxygen generator, including a generator shell, a starting device, and an oxygen candle. The oxygen candle is housed inside the generator shell, with a heat insulation layer between the oxygen candle and the generator shell. A filter device is located on the outside of the oxygen candle, comprising a filter spiral tube coiled around the outside of the oxygen candle. The filter material is filled inside the filter spiral tube and fixed by metal meshes at both ends. The lower end of the filter spiral tube is connected to the bottom of the oxygen candle via a U-shaped conduit. This utility model integrates the spiral tube-shaped filter device inside the oxygen generator, eliminating the need for an additional filter device and facilitating the lightweight development of oxygen generators. The spiral tube structure ensures full contact between the gas and the filter material, and the heat generated by the decomposition of the oxygen candle accelerates the absorption of harmful gases by the filter material, reducing the amount of filter material required and improving filtration efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of life-saving devices, specifically to a solid chemical oxygen generator. Background Technology

[0002] Commonly used solid chemical oxygen generators employ chemical oxygen candles to produce oxygen. The working principle is as follows: oxygen-rich chlorate undergoes a thermal decomposition reaction at high temperatures to release oxygen. During the high-temperature decomposition of chlorate, small amounts of harmful gases such as chlorine, carbon monoxide, and carbon dioxide are produced. Of these harmful gases, chlorine is the most dangerous; even trace amounts of chlorine in the produced oxygen can render it unsuitable for medical use. Therefore, to ensure that the produced oxygen can be used for emergency life-saving oxygen supply, an additional filter is typically installed on the outside of the solid chemical oxygen generator. Current filters are relatively large and contain a significant amount of chemicals, hindering the development of lightweight solid chemical oxygen generators. Utility Model Content

[0003] This invention addresses the problems of low filtration efficiency, large size, and large amount of chemical filling in traditional filtration devices by proposing a new solid chemical oxygen generator.

[0004] This utility model is achieved through the following technical solution:

[0005] A solid chemical oxygen generator includes a generator housing, a starting device, and an oxygen candle. The oxygen candle is housed inside the generator housing, and a heat insulation layer is provided between the oxygen candle and the generator housing. A filter device is provided on the outside of the oxygen candle. The filter device includes a filter spiral tube coiled around the outside of the oxygen candle. The filter spiral tube is filled with filter material, which is fixed by metal meshes at both ends. The lower end of the filter spiral tube is connected to the bottom of the oxygen candle through a U-shaped conduit.

[0006] Furthermore, one-way valves are provided at both ends of the filter spiral tube, which allow gas to flow in only from the lower end of the filter spiral tube and out only from the upper end of the filter spiral tube.

[0007] Furthermore, the oxygen candle includes an oxygen candle housing and an oxygen candle propellant column. The bottom of the oxygen candle housing is provided with a porous support plate, and the oxygen candle propellant column is fixed on the porous support plate.

[0008] Furthermore, a buffer layer is provided between the oxygen candle shell and the oxygen candle propellant column.

[0009] Furthermore, a lower end cap is provided below the porous support plate, and one end of the U-shaped conduit is fixed to the lower end cap and communicates with the interior of the oxygen candle housing.

[0010] Furthermore, the end of the U-shaped conduit that communicates with the oxygen candle housing is lower than the end of the U-shaped conduit that communicates with the filter spiral tube.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] This invention integrates a spiral tubular filter device inside an oxygen generator, eliminating the need for an additional filter device and facilitating the lightweight development of oxygen generators. The spiral tubular structure ensures full contact between the gas and the filter material, and the heat generated by oxygen decomposition accelerates the absorption of harmful gases by the filter material, reducing the amount of filter material required and improving filtration efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the oxygen candle and filtration device in this utility model;

[0015] Figure 3 This is a schematic diagram of the one-way valve in this utility model;

[0016] Explanation of reference numerals in the attached drawings: 1-Generator housing; 2-Starting device; 3-Oxygen candle; 4-Insulation layer; 5-Filter device; 6-Filter spiral tube; 7-Filter material; 8-Metal mesh; 9-U-shaped conduit; 10-One-way valve; 11-Oxygen candle housing; 12-Oxygen candle propellant; 13-Porous support plate; 14-Lower end cap; 15-Buffer layer; 16-Valve core; 17-Spring; 18-Flare mouth. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Example 1:

[0021] See Figure 1 , Figure 2 This embodiment of a solid chemical oxygen generator includes a generator housing 1, a starting device 2, and an oxygen candle 3. The oxygen candle 3 is installed inside the generator housing 1, and a heat insulation layer 4 is provided between the oxygen candle 3 and the generator housing 1. A filter device 5 is provided on the outside of the oxygen candle 3. The filter device 5 includes a filter spiral tube 6 coiled around the outside of the oxygen candle 3. The filter spiral tube 6 is filled with filter material 7, which is fixed by metal mesh 8 at both ends. The lower end of the filter spiral tube 6 is connected to the bottom of the oxygen candle 3 through a U-shaped conduit 9.

[0022] In this embodiment, the generator housing 1 is the outermost packaging shell of the solid chemical oxygen generator, typically a paper tube or iron tube. The heat insulation layer 4 can be one of the heat insulation materials such as ceramic fiber cotton or polyurethane foam. The oxygen candle 3 is installed inside the generator housing 1, with the heat insulation layer 4 between the oxygen candle 3 and the generator housing 1. The starting device 2 is mechanical, igniting the primer by striking it with a striking pin.

[0023] In this embodiment, the oxygen candle 3 includes an oxygen candle shell 11 and an oxygen candle propellant 12. The oxygen candle shell 1 is composed of a stainless steel cylinder, an upper end cap, and a lower end cap 14. The upper end cap is welded and fixed to the stainless steel cylinder. The upper end cap has a small hole in which an impact primer is installed. An impactor is installed on top of the upper end cap. A perforated support plate 13 is provided at the bottom of the oxygen candle shell 11, and the oxygen candle propellant 12 is fixed on the perforated support plate 13. The oxygen candle propellant 12 is usually prepared by pressing igniting powder onto the oxygen-producing propellant of the oxygen candle. The igniting powder plays a connecting role, receiving the energy of the primer for combustion and igniting the oxygen-producing propellant.

[0024] In this embodiment, the oxygen candle propellant column 12 is mainly composed of sodium chlorate, with added fuel titanium powder, iron powder, catalyst cobalt hydroxide, chlorine inhibitor barium peroxide, stabilizer potassium perchlorate, silicon powder, and binder kaolin, and is mixed evenly and pressed together.

[0025] In this embodiment, a buffer layer 15 is provided between the oxygen candle housing 11 and the oxygen candle propellant 12. The buffer layer 15 can be made of materials such as glass fiber cotton or ceramic fiber cotton, which serves to fix the oxygen candle propellant 12 and provide cushioning.

[0026] In this embodiment, the starting device 2 can also be a power-accumulating firing device composed of a spring-loaded firing pin and a locking pin. The firing pin has a set of horizontally and vertically intersecting holes above it. After passing through the spring, the firing pin is assembled inside the pressure cap. The spring is compressed to accumulate power. A locking ball is inserted into each end of the horizontal hole above the firing pin, and a pin is inserted into the vertical hole above. Under the action of the pin, the locking ball is pushed outward and embedded into a groove on the inner wall of the pressure cap, preventing the firing pin from moving downward. When the pin is pulled out, the locking ball moves inward and disengages from the groove. The firing pin, under the force of the spring, fires downward, striking the primer and igniting the oxygen candle propellant. The starting device 2 uses existing technology and will not be described in detail.

[0027] In this embodiment, the filtration device 5 includes a filter spiral tube 6 coiled around the outside of the oxygen candle 3. The filter spiral tube 6 is a rigid tube made of metal (iron, aluminum, copper) tubing or high-temperature resistant plastic tubing. The filter spiral tube 6 is filled with filter material 7, which is typically composed of hogalat and one or more of sodium hydroxide, sodium peroxide, and potassium hydroxide. The filter material 7 absorbs trace impurities such as chlorine and converts carbon monoxide into carbon dioxide, ensuring that the produced oxygen meets medical oxygen standards and can be directly supplied for human respiration. The filter material 7 is fixed at both ends by metal mesh 8, which is a woven metal mesh with a mesh size between 30 and 100 meshes, and can be made of copper or stainless steel. The lower end of the filter spiral tube 6 is connected to the bottom of the oxygen candle 3 via a U-shaped conduit 9.

[0028] See Figure 1 , Figure 3 In this embodiment, one-way valves 10 are provided at both ends of the filter spiral tube 6. The one-way valves 10 allow gas to flow in only from the lower end of the filter spiral tube 6 and out from the upper end. The valve core 16 of the one-way valve is pressed against the flared end 18 by a spring 17. The side of the valve core 16 has a radial through hole that communicates with another hole along the axial direction of the valve core. When the gas pressure in the tube reaches the opening threshold of the one-way valve 10, it opens the valve core 16. Unfiltered gas enters the filter device 5 through the through hole inside the valve core 16 of the one-way valve at the lower end. The filtered oxygen is discharged through the through hole inside the valve core 16 of the one-way valve at the upper end of the filter device 5. The one-way valve at the upper end can be connected to an air bag, which is connected to a nasal cannula or other oxygen inhalation device.

[0029] In this embodiment, a lower end cap 14 is provided below the porous support plate 13, and one end of the U-shaped conduit 9 is fixed on the lower end cap 14 and communicates with the interior of the oxygen candle housing 11.

[0030] The end of the U-shaped conduit 9 that connects to the oxygen candle housing 11 is lower than the end of the U-shaped conduit 9 that connects to the filter spiral tube 6.

[0031] In this embodiment, the starting device 2 is first installed on the upper end cover, the oxygen candle 3 is wrapped with a layer of fiber cotton and inserted into the oxygen candle shell 11 from the lower end, the porous support plate 13 and the lower end cover 14 with U-shaped conduit 9 are installed, the filter device 5 is installed, and finally, together with the heat insulation layer 4, they are installed into the generator shell 1.

[0032] This invention employs a spiral tubular filtration device, extending the airflow path and effectively increasing the contact time between the gas and the filter material, thereby improving absorption efficiency. Simultaneously, the heat generated by oxygen decomposition heats the filtration device, and the high-temperature environment effectively increases the chemical reaction rate of the filter material, accelerating its absorption of harmful gases, reducing the amount of filter material required, lightening weight, and improving filtration efficiency. Since the filtration device is integrated within the oxygen generator, no additional filtration unit is needed, facilitating the miniaturization and lightweight development of oxygen generators. This technology is widely used in aerospace, shipbuilding, mining, and various disaster self-rescue applications.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A solid chemical oxygen generator, comprising a generator housing (1), a starting device (2), and an oxygen candle (3), characterized in that, The oxygen candle (3) is installed inside the generator housing (1). A heat insulation layer (4) is provided between the oxygen candle (3) and the generator housing (1). A filter device (5) is provided on the outside of the oxygen candle (3). The filter device (5) includes a filter spiral tube (6) coiled around the outside of the oxygen candle (3). The filter spiral tube (6) is filled with filter material (7). The filter material (7) is fixed by metal mesh (8) at both ends. The lower end of the filter spiral tube (6) is connected to the bottom of the oxygen candle (3) through a U-shaped conduit (9).

2. The solid chemical oxygen generator according to claim 1, characterized in that, The filter spiral tube (6) is provided with one-way valves (10) at both ends. The one-way valves (10) allow gas to flow in from the lower end of the filter spiral tube (6) and flow out from the upper end of the filter spiral tube (6).

3. The solid chemical oxygen generator according to claim 1, characterized in that, The oxygen candle (3) includes an oxygen candle shell (11) and an oxygen candle propellant (12). The bottom of the oxygen candle shell (11) is provided with a porous support plate (13), and the oxygen candle propellant (12) is fixed on the porous support plate (13).

4. The solid chemical oxygen generator according to claim 3, characterized in that, A buffer layer (15) is provided between the oxygen candle shell (11) and the oxygen candle propellant (12).

5. The solid chemical oxygen generator according to claim 3, characterized in that, The porous support plate (13) is provided with a lower end cap (14) below it, and one end of the U-shaped conduit (9) is fixed on the lower end cap (14) and communicates with the interior of the oxygen candle shell (11).

6. The solid chemical oxygen generator according to claim 5, characterized in that, The end of the U-shaped conduit (9) that communicates with the oxygen candle housing (11) is lower than the end of the U-shaped conduit (9) that communicates with the filter spiral tube (6).

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