Auxiliary device for performance test of oxygen candle ignition system

Abstract

An auxiliary device for performance test of an oxygen candle ignition system comprises a pressure-resistant cylinder with two open ends, a medicine box, a pressure sensor, a gas collecting bag and a controller, an upper end cover and a lower end cover are installed at the upper end and the lower end of the pressure-resistant cylinder respectively, and a connector is installed at the opening of the side wall of the pressure-resistant cylinder; a mounting hole for mounting an igniter is formed in the center of the upper end cover; a gas outlet communicated with the pressure-resistant cylinder is formed in the lower end cover; after the powder box is arranged at the lower end of the upper end cover, the open end of the powder box is communicated with the igniter arranged in the center of the upper end cover, oxygen candle ignition powder is placed in the powder box, and a plurality of air outlet holes are uniformly distributed in the inner cylinder wall of the powder box; the pressure sensor is communicated with the pressure-resistant cylinder through the interface; the air collecting bag is communicated with an air outlet through an air pipe; an electromagnetic valve is arranged on the air outlet; the controller is used for monitoring pressure signals of the pressure sensor and controlling the electromagnetic valve to be opened and closed. Multiple performance parameters of the oxygen candle ignition system can be simultaneously represented in a single test, and the purposes of comprehensive test and comprehensive measurement of the output capability of the oxygen candle ignition system are achieved.

Description

Technical Field

[0001] This utility model relates to the field of oxygen candle technology, specifically to an auxiliary device for testing the performance of an oxygen candle ignition system. Background Technology

[0002] An oxygen candle is an oxygen supply device that generates oxygen through a chemical reaction. It is widely used in confined spaces such as aerospace, aviation, navigation, and mining, and is an important piece of equipment for oxygen deficiency protection and emergency escape.

[0003] An oxygen candle mainly consists of an ignition system, an oxygen production system, a heat insulation system, and a filtration system. The ignition system includes an igniter and a igniter. Igniters for oxygen candles are mainly mechanical or electric. Mechanical igniters require a firing device, while electric igniters require a power source. The igniter is located at the head of the oxygen-producing propellant column. It is ignited by the energy released from the electric igniter or the impact primer. It utilizes the large amount of high-temperature gas or incandescent solid particles generated during combustion to provide sufficient energy and temperature to ignite the oxygen-producing propellant column, thus acting as a relay ignition. The ignition system plays a crucial role in the working performance of the oxygen candle, affecting its reliability and operational safety under various environmental conditions. If the ignition system misfires, it will lead to the failure to ignite the oxygen-producing propellant column, and the entire device will malfunction. If the ignition process involves flow and splashing, causing the casing to burn through, it may cause a fire. Moreover, the high combustion temperature of the igniter makes it easy to generate impurity gases, which is a key factor affecting the overall product's gas composition qualification rate. Therefore, in the development of oxygen candle products, it is essential to conduct independent and focused research on the ignition system, and to accurately detect and evaluate data such as the output pressure, gas composition, gas production rate, and residue rate of the oxygen candle ignition system.

[0004] Currently, there is no dedicated device for comprehensive performance testing of oxygen candle ignition systems in the technical research on oxygen candle performance testing devices. Existing devices, such as patents CN218629729U, CN102192691B, and CN102192689B, test the gas composition, output energy, and ignition temperature of the igniter or primer. However, the oxygen candle ignition system is an integration of the igniter and the ignition propellant, both of which are indispensable. There are also devices that test the gas composition or heat release of the entire oxygen candle, such as patents CN109682418B and CN115343327A. However, research on oxygen candle ignition systems does not require the participation of oxygen-generating propellant columns. Introducing oxygen-generating propellant columns not only causes significant deviations in test results but also wastes resources. Furthermore, the devices disclosed in the aforementioned patents can only test relatively single parameters and cannot simultaneously meet the requirements of measuring the output pressure, gas composition, gas production rate, and residue rate of the oxygen candle ignition system. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an auxiliary device for testing the performance of an oxygen candle ignition system. This device can not only flexibly select between electric and mechanical ignition methods according to the actual use of the oxygen candle, but also monitor the output pressure of the oxygen candle ignition system in real time during a single test. At the same time, it can obtain multiple performance parameters such as gas composition, gas production rate, and residue rate through subsequent detection and calculation, comprehensively measure the compatibility between the igniter and the oxygen candle igniter, as well as the output capacity of the oxygen candle igniter, and assist in optimizing and improving the oxygen candle ignition system.

[0006] This utility model adopts the following technical solution: an auxiliary device for testing the performance of an oxygen candle ignition system, comprising:

[0007] A pressure-resistant cylinder with openings at both ends, wherein an upper end cap and a lower end cap are respectively installed on the upper and lower ends of the pressure-resistant cylinder, and an interface is installed at the opening of the side wall of the pressure-resistant cylinder.

[0008] The upper end cover has a mounting hole for installing an igniter at the center, and the lower end cover has an air outlet that communicates with the pressure-resistant cylinder.

[0009] The medicine box is a double-layered cylindrical structure with one end open and the other end closed. After the medicine box is installed at the lower end of the upper cover, the open end of the medicine box is connected to the igniter installed in the center of the upper cover. The medicine box contains an oxygen candle igniter. The inner wall of the medicine box is evenly distributed with several vent holes.

[0010] A pressure sensor, which is connected to the pressure-resistant cylinder via an interface;

[0011] The gas collection bag is connected to the gas outlet via an air pipe, and a solenoid valve is installed on the gas outlet.

[0012] and a controller, wherein the controller is used to monitor the pressure signal from the pressure sensor and to control the opening and closing of the solenoid valve.

[0013] The igniter is either an electric igniter or a mechanical igniter.

[0014] The medicine box has a double-layered cylindrical structure.

[0015] The outer cylinder wall of the medicine box is lower than the inner cylinder wall, the uppermost vent on the inner cylinder wall is lower than the upper surface of the outer cylinder wall, and the upper end of the inner cylinder wall is fixed to the upper end cap.

[0016] The oxygen candle igniter is a compressed propellant column or tablet.

[0017] The outer walls of the upper and lower end caps are provided with external threads, and both ends of the inner wall of the pressure-resistant cylinder are provided with internal threads. The upper and lower end caps are threadedly connected to both ends of the inner wall of the pressure-resistant cylinder. One end of the upper and lower end caps protrudes outward with an outer ring, the diameter of which is larger than the inner diameter of the pressure-resistant cylinder.

[0018] The upper and lower end caps are fitted with sealing rings, which are pressed between the two end faces of the pressure-resistant cylinder and the outer ring.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] 1. This utility model can conduct comprehensive performance testing on oxygen candle ignition systems, and considering the actual use of oxygen candle products, it allows for flexible selection of electric ignition and mechanical ignition methods.

[0021] 2. This utility model can simultaneously characterize multiple performance parameters of an oxygen candle ignition system, including output pressure, gas composition, gas production rate, and residue rate, in a single test. Moreover, the output pressure data can be acquired in real time, realizing the automation and informatization of the test, improving the monitoring capability of the test process and the traceability capability of the test results, effectively simplifying the test process, improving test efficiency, and reducing test costs.

[0022] 3. This utility model can comprehensively understand the performance parameters of the oxygen candle ignition system, fully measure the compatibility between the igniter and the oxygen candle igniter, as well as the output capacity of the oxygen candle igniter, thereby helping to optimize and improve the oxygen candle ignition system and achieve quality improvement of oxygen candle products. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is an assembly diagram of the mechanical igniter and the upper cover;

[0025] Figure 3 This is an assembly diagram of the electric igniter and the upper cover;

[0026] Figure 4 It is the output pressure-time curve;

[0027] In the diagram: 1. Pressure-resistant cylinder; 2. Igniter; 3. Propellant box; 4. Oxygen candle igniter; 5. Pressure sensor; 6. Data acquisition system; 7. Solenoid valve; 8. Gas collection bag; 9. Upper end cover; 10. Lower end cover; 11. Cylinder; 12. Sensor interface; 13. Gas outlet; 14. Outer wall of the propellant box; 15. Inner wall of the propellant box; 16. Gas outlet hole; 17. Burner cap mounting base; 18. Firing device; 19. Primer. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings.

[0029] See Figure 1 The device of this utility model includes a pressure-resistant cylinder 1, an igniter 2, a medicine box 3, an oxygen candle igniter 4, a pressure sensor 5, a controller 6, a solenoid valve 7, and a gas collection bag 8.

[0030] The pressure-resistant cylinder 1 is a cylindrical structure with openings at both ends. An upper end cover 9 and a lower end cover 10 are respectively mounted on the two open ends of the pressure-resistant cylinder 1. The upper end cover 9 has an axially extending mounting hole at its center for installing an igniter 2. The igniter 2 is fixed to the center of the upper end cover 9 via a threaded connection. A sealing ring (existing technology) is used to seal the threaded connection. The sealing ring is an O-ring or a silicone gasket. The side of the pressure-resistant cylinder 1 has a threaded opening for installing a sensor interface 12, which is threaded into the threaded opening. The interface 12 is threadedly connected to the pressure sensor 5. A sealing ring is used to seal the threaded connection. The controller 6 is connected to the pressure sensor 5 via a signal line to collect data from the pressure sensor 5. The pressure signal is measured; the lower end cover 10 is provided with an air outlet 13 that communicates with the pressure-resistant cylinder 1. The air outlet 13 is connected to the solenoid valve 7 by a thread, and a sealing ring is provided at the thread connection for sealing. The gas collection bag 8 has its own air pipe, and the other end of the air pipe is connected to the solenoid valve 7 through an air pipe connector. There is a valve on the air pipe, and the solenoid valve 7 is controlled to open and close by the controller 6; the medicine box 3 is a double-layered cylindrical structure with one end open and the other end closed. The height of the outer cylinder wall 14 of the medicine box 3 is lower than that of the inner cylinder wall 15. Multiple air outlets 16 are opened on the inner cylinder wall 15. The position of the uppermost air outlet on the inner cylinder wall 15 is lower than the upper end face of the outer cylinder wall 14. The upper end of the inner cylinder wall 15 is fixed to the upper end cover 9 by a flange or thread seal. The double-layered structure of the medicine box prevents the ignition agent from splashing and contaminating the inner wall of the cylinder, and at the same time reduces the error of the gas production rate and residue rate results. After the powder box 3 is installed at the lower end of the upper cover 9, the open end of the powder box 3 is connected to the igniter 2 installed at the center of the upper cover 9, and together with the igniter 2, they define the powder chamber. The oxygen candle igniter 4 is contained in the powder chamber. The oxygen candle igniter 4 is a pressed Ф14mm×15mm powder column. The controller is a PLC, PC or microcontroller. The acquisition of the pressure sensor 5 signal and the control of the solenoid valve opening and closing through the controller are existing technologies, and will not be described in detail in this embodiment.

[0031] The outer walls of the upper end cover 9 and the lower end cover 10 are provided with external threads, and the inner walls of both ends of the pressure-resistant cylinder 1 are provided with internal threads. The outer walls of the upper end cover 9 and the lower end cover 10 are threadedly connected to the inner walls of both ends of the pressure-resistant cylinder 1. One end of the upper end cover 9 and the lower end cover 10 has an outer ring protruding outward. A sealing ring is fitted on the upper end cover 9 and the lower end cover 10, and the sealing ring is pressed between the two end faces of the pressure-resistant cylinder 1 and the outer ring.

[0032] like Figure 2 In this embodiment, the igniter 2 is a mechanical igniter. The external thread of the igniter's cap mounting base 17 is screwed to the mounting hole of the upper end cover 9, and the internal thread of the cap mounting base 17 is screwed to the firing device 18. The cap 19 is fixed to the bottom of the mounting base and communicates with the opening end of the medicine box 3.

[0033] like Figure 3 In this embodiment, igniter 2 is an electric igniter.

[0034] Performance testing process:

[0035] Weigh the powder box 3 and the oxygen candle igniter 4, recording the weight of powder box 3 as 12.7g and the weight of oxygen candle igniter 4 as 6.2g. See the apparatus below. Figure 1 During assembly, solenoid valve 7 is closed, electric igniter 2 is activated, and oxygen candle igniter 4 is ignited. Pressure data output from pressure sensor 5 is recorded and saved in real time, along with the pressure-time curve, as shown below. Figure 4 When the controller detects stable output pressure, it opens solenoid valve 7 to release gas, which is collected in gas collection bag 8. The valve on the gas tubing is closed, disconnecting the tubing from the solenoid valve. Then, the tubing is connected in sequence to the GASTEC gas detection tube and the GASTEC manual gas sampling pump GV-100S. The valve on the tubing is opened, and the GASTEC manual gas sampling pump GV-100S is used to uniformly pass 100ml of gas from the gas bag through the gas detection tube. The gas composition is detected: carbon monoxide concentration 13ppm, carbon dioxide concentration 537ppm, and chlorine concentration 0.2ppm. Next, the upper cap 9 is unscrewed, and the medicine box 3 is disassembled. The medicine box 3 and the combustion residue inside are weighed; the total weight is 15.4g. The ignition residue rate is calculated as (15.4-12.7) / 6.2×100%=43.5%, and the ignition gas production rate is calculated as (12.7+6.2-15.4) / 6.2×100%=56.5%.

Claims

1. An auxiliary device for testing the performance of an oxygen candle ignition system, characterized in that, include: A pressure-resistant cylinder (1) with openings at both ends, wherein an upper end cap (9) and a lower end cap (10) are respectively installed on the upper and lower ends of the pressure-resistant cylinder (1), and an interface (12) is installed at the opening of the side wall of the pressure-resistant cylinder (1). The upper end cover (9) has a mounting hole for installing an igniter (2) at the center, and the lower end cover (10) has an air outlet (13) that communicates with the pressure-resistant cylinder (1). The medicine box (3) is a double-layered cylindrical structure with one end open and the other end closed. After the medicine box (3) is installed at the lower end of the upper cover (9), the open end of the medicine box (3) is connected to the igniter (2) installed in the center of the upper cover (9). The medicine box (3) contains oxygen candle ignition powder (4). The inner wall (15) of the medicine box (3) is evenly distributed with several vent holes (16). Pressure sensor (5), which is connected to pressure-resistant cylinder (1) via interface (12); The gas collection bag (8) is connected to the air outlet (13) via an air pipe. The air outlet (13) is equipped with a solenoid valve (7). and controller (6), the controller (6) is used to monitor the pressure signal of pressure sensor (5) and control the opening and closing of solenoid valve (7).

2. The auxiliary device for performance testing of an oxygen candle ignition system according to claim 1, characterized in that, The igniter (2) is an electric igniter or a mechanical igniter.

3. The auxiliary device for performance testing of an oxygen candle ignition system according to claim 1, characterized in that, The medicine box (3) has a double-layer cylindrical structure.

4. An auxiliary device for performance testing of an oxygen candle ignition system according to claim 1 or 3, characterized in that, The outer cylinder wall (14) of the medicine box (3) is lower than the inner cylinder wall (15). The uppermost air vent on the inner cylinder wall (15) is lower than the upper end face of the outer cylinder wall (14). The upper end of the inner cylinder wall (15) is fixed to the upper end cover (9).

5. The auxiliary device for performance testing of an oxygen candle ignition system according to claim 1, characterized in that, The oxygen candle igniter (4) is a compressed ignition column or tablet.

6. The auxiliary device for performance testing of an oxygen candle ignition system according to claim 1, characterized in that, The upper end cover (9) and lower end cover (10) are provided with external threads on their outer walls, and the pressure-resistant cylinder (1) is provided with internal threads at both ends of its inner wall. The upper end cover (9) and lower end cover (10) are threadedly connected to the two ends of the inner wall of the pressure-resistant cylinder (1). One end of the upper end cover (9) and lower end cover (10) protrudes outward with an outer ring, the diameter of which is larger than the inner diameter of the pressure-resistant cylinder (1).

7. An auxiliary device for performance testing of an oxygen candle ignition system according to claim 1 or 6, characterized in that, The upper end cover (9) and lower end cover (10) are fitted with sealing rings, which are pressed between the two end faces of the pressure-resistant cylinder (1) and the outer ring.

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