A mechanical pull-ignition delay gas generating device

Abstract

The present invention discloses a mechanical pull-fire pyrotechnic delay gas generating device, belonging to the technical field of initiators. The gas generating device includes a three-stage mechanical safety mechanism (primary safety, secondary safety, and service safety), a firing mechanism, an ignition component, a delay component, a main charge package actuating component, etc. The gas generator of the present invention meets the requirements of mechanical pull-fire, mechanical safety, pyrotechnic delay, and stable output at low pressure. Compared with traditional electrically fired gas generators, the present invention has high safety in electromagnetic environments and service transportation, and also has the advantages of low cost, high practicability, and stable work ability in low-pressure environments, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of initiators, and particularly to a mechanical pull - fired pyrotechnic delay gas - generating device. Background Art

[0002] In the fields of civil meteorology, military, etc., inside the deceleration system cabin of a rocket sonde, a gas - generating device needs to be installed to provide the power for ejecting the parachute for the sonde ejection cylinder, push the deceleration parachute out of the ejection cylinder, and complete the high - altitude release action of the deceleration parachute.

[0003] Currently, the gas - generating devices used in this field generally adopt electrically - fired gas - generating devices. Such electrically - fired gas - generating devices have problems such as low accuracy of action delay time, poor electromagnetic compatibility, and low safety when in use. Summary of the Invention

[0004] The purpose of the present invention is to provide a mechanical pull - fired pyrotechnic delay gas - generating device to solve the above problems.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A mechanical pull - fired pyrotechnic delay gas - generating device includes a housing and a housing cover on the housing. Inside the housing, a primary safety mechanism, a secondary safety mechanism, a service safety mechanism, and a sealing plug are respectively arranged in four mutually perpendicular directions. The installation hole of the primary safety mechanism and the installation hole of the service safety mechanism penetrate each other to form a first through - hole, and the installation hole of the secondary safety mechanism and the installation hole of the sealing plug penetrate each other to form a second through - hole; at the position where the secondary safety mechanism and the sealing plug penetrate each other perpendicularly, a delay component is arranged. Below the delay component, an ignition component is arranged, and above the delay component, a main charge package is arranged. A firing mechanism is also provided, and the firing mechanism is composed of a firing pin, a storage spring, and a pressure screw. The firing mechanism is installed in the second through - hole.

[0007] The above gas - generating device of the present invention is a gas - generating device with all - mechanical three - level safety and high - precision pyrotechnic delay. The all - mechanical structure ensures the electromagnetic compatibility requirements of the product, and the three - level safety device greatly improves the safety and controllability of the product during service, assembly, and on the rocket.

[0008] Since the existing general electrically - fired gas - generating device uses the method of combining a bridge wire, a bridge strip with an ignition agent, and the bridge wire and bridge strip generate heat to ignite the ignition agent under the condition of inputting a certain amount of electric energy, its electromagnetic compatibility and safety are mainly related to the sensitivity of the electrically - fired component. The mechanical firing method adopted in this application can fundamentally avoid the safety problems caused by the sensitivity matching problem of the electrically - fired component of the product.

[0009] As a preferred technical solution: The primary safety mechanism includes a primary safety pin, a primary sealing ring, and a primary safety spring. The primary sealing ring is installed in the sealing groove of the primary safety pin, and the primary safety pin with the primary sealing ring installed passes through the inner hole of the primary safety spring installed in the housing to press the primary safety pin.

[0010] As a preferred technical solution: The secondary safety mechanism includes a pressure seat, a nut, a secondary safety spring, a secondary safety pin, and a safety steel ball. Among them, the secondary safety pin is inserted into the inner hole of the firing pin from the direction of the second through hole, and the through hole on the side of its end is aligned with the first through hole. After relaxing part of the primary safety spring, the primary safety pin passes through the side hole of the firing pin, and the service safety pin is tightened. The secondary safety spring is installed above the pressure screw, the pressure seat equipped with a sealing ring is placed above the secondary safety spring, and the nut is installed in the upper groove of the pressure seat and tightened to the secondary safety pin.

[0011] As a further preferred technical solution: The inner hole of the threaded end of the secondary safety pin is equipped with a support spring and a rolling steel ball, and is constrained by the tightened nut. The safety steel ball is installed in two holes on the upper side wall of the firing pin.

[0012] As a preferred technical solution: The service safety includes a service safety pin and a horseshoe-shaped ring buckle.

[0013] As a preferred technical solution: The ignition component, the delay component, the main charge package, and the shell cover respectively form independent components and assemblies, which respectively realize the functions of ignition, delay, and actuation of the product.

[0014] As a further preferred technical solution: The shell cover is an assembly, including a shell cover body, a sealing aluminum foil, and a lateral exhaust hole, and is provided with a shell cover sealing ring. The lateral exhaust hole of the shell cover reduces the impact and ablation on the front sounding device and the parachute pack after the gas generator ignites; the shell cover sealing ring ensures the seal between the gas generator and the sounding device parachute tube.

[0015] As a preferred technical solution: The tip of the firing pin is spherical, the tip diameter is φ0.6 - Φ1.0 mm, more preferably φ0.8 mm, and the height is 1.0 mm - 1.5 mm, more preferably 1.2 mm.

[0016] As a preferred technical solution: The energy storage spring, the primary safety spring, the secondary safety spring, etc. of the mechanical pull-fire working delay gas generator are all made of high-quality carbon spring steel.

[0017] As a preferred technical solution: The delay charge used in the delay component of the mechanical pull-fire and delay gas generator is tungsten-based delay charge, and the delay time can be adjusted according to requirements by adjusting the length of the delay component. The initial ignition charge ignites the delay component, completes the pyrotechnic delay, and ignites the high-energy output ignition charge, generating high-temperature and high-pressure gas and flame, which acts on the main charge.

[0018] As a preferred technical solution: The main charge of the mechanical pull-fire and delay gas generator is a mixture of small-grain (particle size (diameter) 0.63 mm - 1.18 mm) black powder and high-energy ignition charge. After the main charge burns, it can ensure the reliable operation of the gas generator in low-temperature and low-pressure environments, providing the energy for the ejection parachute of the radiosonde released at high altitude to eject from the cabin.

[0019] Compared with the prior art, the advantages of the present invention are as follows: The present invention provides a gas generating device that generates a certain amount of gas within a specified time through mechanical ejection and pulling to complete the actuation. The gas generating device of the present invention meets the requirements of mechanical pulling, mechanical insurance, pyrotechnic delay, and stable output under low pressure. Compared with the traditional electrically initiated gas generator, it has high safety in the electromagnetic environment and service transportation. Because the general electrically initiated gas generator uses the method of bridge wire and bridge tape cooperating with ignition agent, and under the condition of inputting a certain amount of electric energy, the bridge wire and bridge tape heat up to ignite the ignition agent, its electromagnetic compatibility and safety are mainly related to the sensitivity of the electrically initiated component. The mechanical ignition method adopted in this design can fundamentally avoid the safety problems caused by the sensitivity matching problem of the electrically initiated component of the product. At the same time, it has the advantages of low cost, high practicability, and stable work ability in low-pressure environments, and has broad application prospects. Description of the Drawings

[0020] Figure 1 is the structural schematic diagram of the embodiment of the present invention;

[0021] Figure 2 is Figure 1 the A-A cross-sectional view of

[0022] In the figure: 1. Shell cover; 2. Sealing gasket; 3. Main charge package; 4. Secondary sealing ring; 5. Nut; 6. Rolling steel ball; 7. Support spring; 8. Pressure seat; 9. Secondary insurance spring; 10. Secondary insurance pin; 11. Pressure screw; 12. Movable piece; 13. Energy storage spring; 14. Insurance steel ball; 15. Primary insurance pin; 16. Service insurance pin; 17. Firing pin; 18. First ignition component sealing ring; 19. Plug; 20. Ignition component; 21. Second ignition component sealing ring; 22. Shell; 23. Delay component; 24. Shell cover sealing ring; 25. Sealing gasket; 26. Primary insurance spring; 27. Primary sealing ring; 28. Horseshoe-shaped ring buckle. Detailed Embodiments

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Embodiment:

[0025] Refer to Figure 1 and Figure 2 A mechanical pull-fire delay gas generating device, including a housing 22 and a housing cover 1 on the housing 22. In the housing 22, a primary safety mechanism, a secondary safety mechanism, a service safety mechanism, and a sealing plug are respectively arranged in four mutually perpendicular directions. The installation holes of the primary safety mechanism and the service safety mechanism penetrate each other to form a first through hole, and the installation holes of the secondary safety mechanism and the sealing plug penetrate each other to form a second through hole; at the position where the secondary safety mechanism and the sealing plug penetrate each other perpendicularly, a delay assembly 23 is arranged. Below the delay assembly 23, a firing component 20 is arranged, and above the delay assembly 23, a main charge package 3 is arranged. A firing mechanism is also arranged. The firing mechanism is composed of a firing pin 17, a energy storage spring 13, a movable piece 12, and a compression screw 11. The firing pin 17 is installed in the second through hole, and the large hole of the firing pin 17 is aligned with the first through hole in the housing 22. Through the matching design of the compression energy of the energy storage spring 13 and the impact stroke of the firing pin 17, the expected function is achieved; the service safety mechanism includes a service safety pin 16 and a horseshoe-shaped ring buckle; the movable piece 12 is coated with grease and installed in the groove below the compression screw 11 and above the energy storage spring 13 to reduce the friction force above the spring when the compression screw 11 is tightened to compress the energy storage spring 13, so that it does not rotate with the compression screw 11, thereby ensuring that the energy storage spring 13 does not deform during the tightening process; the firing pin 17, as an important part of the firing mechanism, impacts the primer of the firing component to fire by the energy given by the energy storage spring 13;

[0026] The primary safety mechanism includes a primary safety pin 15, a primary sealing ring 27, and a primary safety spring 26. The primary safety spring 26 is installed at the large hole position of the first through hole in the housing 22. The primary sealing ring 27 is installed in the sealing groove of the primary safety pin 15. The primary safety pin 15 installed with the primary sealing ring 27 passes through the inner hole of the primary safety spring 26 installed in the housing 22 to press the primary safety pin 15; after pre-compressing the primary safety spring 26, insert the service safety pin 16 into the threaded hole of the primary safety pin 15 at the relative position of the first through hole, and complete the locking of the primary safety mechanism by the service safety mechanism through thread tightening; one end of the service safety pin 16 is provided with a horseshoe-shaped ring buckle 28;

[0027] The secondary insurance mechanism includes a pressure seat 8, a nut 5, a secondary insurance spring 9, a secondary insurance pin 10, and an insurance steel ball 14. Among them, the secondary insurance pin 10 is inserted into the inner hole of the firing pin 17 from the direction of the large hole of the second through hole, and the through hole on the side of its end is aligned with the first through hole. After relaxing part of the primary insurance spring 26, the primary insurance pin 15 passes through the side hole of the firing pin 17, and the service insurance pin 16 is tightened. The secondary insurance spring 9 is installed above the pressure screw 11, the pressure seat 8 equipped with a sealing ring is placed above the secondary insurance spring 9, and the nut 5 is installed in the upper groove of the pressure seat 8 and tightened to the secondary insurance pin 10;

[0028] The inner hole of the threaded end of the secondary insurance pin 10 is equipped with a support spring 7 and a rolling steel ball 6, and is constrained by the tightened nut 5. Among them, the support spring 7 is installed in the threaded end hole of the secondary insurance pin 10 to support the rolling steel ball 6, so that the rolling steel ball 6 forms a point contact with the side wall of the cabin, changing sliding friction to rolling friction and reducing the friction force when the whole product is ejected from the cabin, which is beneficial to the flight attitude after ejection; The insurance steel ball 14 is installed in the two small holes on the upper side wall of the firing pin 17 to ensure the safety of the product when the primary insurance mechanism and the service insurance mechanism are released and the product is ready to be launched;

[0029] The ignition component 20, the delay component 23, the main charge package 3, and the shell cover 1 respectively form independent components and assemblies, which respectively realize the functions of point-fire transfer, delay, and actuation of the product. The shell cover 1 is an assembly, including a shell cover main body, a sealing aluminum foil, and a lateral exhaust hole, and is provided with a shell cover sealing ring 24;

[0030] A first ignition component sealing ring 18 is also provided to increase the sealing between the ignition component 20 and the shell (the end where the plug is installed), reducing the pressure relief and temperature loss after the combustion of the agent in the ignition component 20; and a second ignition component sealing ring 21 is provided to increase the sealing between the ignition component 20 and the shell (the end where the firing pin impacts), reducing the pressure relief and temperature loss after the combustion of the agent in the ignition component;

[0031] The ignition component 20 mainly includes a primer, a charge seat, and ignition charge. After the primer is impacted and ignited by the firing mechanism, it ignites the ignition charge to complete the expected function;

[0032] The pyrotechnic delay part is realized by the pyrotechnic delay component 23, which mainly includes an initial ignition agent, a delay element, and a high-energy output ignition charge. The expected function of igniting the main charge is completed by the high heat and high flame of the output ignition charge. The main charge is a mixed charge, which is composed of a gas-generating agent and a high-energy ignition charge mixed, and can ensure the stable combustion and reliable action of the gas generator in low-temperature and low-pressure environments such as the stratosphere, providing the energy for the ejection of the deceleration parachute of the radiosonde released at high altitude;

[0033] For the impact mechanism of the mechanical pull-fire and time-delay gas generator, the tip of the firing pin 17 is designed as a spherical surface, with a tip diameter of Φ0.8 mm and a height of 1.2 mm;

[0034] For the energy storage spring, primary safety spring, secondary safety spring, etc. of the mechanical pull-fire and time-delay gas generator, high-quality carbon spring steel is used;

[0035] The delay charge used in the delay component is tungsten-based delay charge, and the delay time can be adjusted according to requirements by adjusting the length of the delay component. The initial ignition charge ignites the delay component, completes the pyrotechnic time delay and ignites the high-energy output ignition charge, generating high-temperature and high-pressure gas and flame, which acts on the main charge;

[0036] The main charge package 3 is a mixture of small-grain black powder and high-energy ignition charge. After the main charge burns, it can ensure the reliable operation of the gas generator in a low-temperature and low-pressure environment, providing the energy for the ejection of the deceleration parachute of the radiosonde released at high altitude to eject from the cabin.

[0037] The working principle of the present invention is:

[0038] This gas generating device is installed in the deceleration system cabin of the radiosonde. After being installed and loaded into the rocket ejection cabin, the service safety pin 16 is unscrewed to release the locking of the primary safety pin 15, the firing pin 17 and the secondary safety pin 10; at this time, the primary safety pin 15 is close to the side wall of the launch cabin. While the rocket launch cabin ejects the radiosonde deceleration system cabin laterally from high altitude, the primary safety spring 26 pushes the primary safety pin 15 out to release the primary safety and release the locking of the firing pin 17; after the radiosonde ejects from the cabin, the compressed secondary safety spring 9 pushes the pressure seat 8, and the nut 5 drives the secondary safety pin 10, etc. to eject from the gas generating device. During the ejection process, the secondary safety pin 10 moves quickly along the ejection direction to release the restraint on the safety steel ball 14. At the same time, the safety steel ball 14 slides into the inner hole of the firing pin 17 to release the restraint of the safety steel ball 14 on the firing pin 17, and the energy storage spring 13 restores its deformation along the direction of the percussion cap of the ignition component 20; during the process of the energy storage spring 13 restoring its deformation, it quickly pushes the firing pin 17 to impact the percussion cap. After the percussion cap is impacted and ignited, the flame ignites the charge below the percussion cap, and ignites the charge of the delay component 23 through the transfer hole below the pyrotechnic delay component 23. After the delay, the output ignition charge of the delay component ignites the main charge package 3. The main charge burns to generate high-temperature and high-pressure gas, which is discharged through the lateral exhaust holes of the shell cover 1 to provide the power for the radiosonde ejection cylinder to eject the deceleration parachute and complete the high-altitude release action of the deceleration parachute.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mechanical pull-initiated delay gas generating device, comprising a housing (22) and a housing cover (1) on the housing (22), characterized in that: Inside the housing (22), a primary safety mechanism, a secondary safety mechanism, a service safety mechanism, and a sealing plug are respectively arranged in four mutually perpendicular directions. The installation holes of the primary safety mechanism and the service safety mechanism penetrate each other to form a first through hole, and the installation holes of the secondary safety mechanism and the sealing plug penetrate each other to form a second through hole. At the position where the secondary safety mechanism and the sealing plug penetrate each other perpendicularly, a delay component (23) is arranged. Below the delay component (23), an ignition component (20) is arranged, and above the delay component (23), a main charge package (3) is arranged. A firing mechanism is also arranged, and the firing mechanism is composed of a firing pin (17), a energy storage spring (13), a movable piece (12), and a compression screw (11). The firing mechanism is installed in the second through hole. The primary safety mechanism includes a primary safety pin (15), a primary sealing ring (27), and a primary safety spring (26). The primary sealing ring (27) is installed in the sealing groove of the primary safety pin (15). The primary safety pin (15) installed with the primary sealing ring (27) passes through the inner hole of the primary safety spring (26) installed in the housing (22) to press the primary safety pin (15). The secondary safety mechanism includes a pressure seat (8), a nut (5), a secondary safety spring (9), a secondary safety pin (10), and a safety steel ball (14). Among them, the secondary safety pin (10) is inserted into the inner hole of the firing pin (17) from the direction of the second through hole, and the through hole on the side of its end is aligned with the first through hole. After relaxing part of the primary safety spring (26), the primary safety pin (15) passes through the side hole of the firing pin (17), and the service safety pin (16) is tightened. The secondary safety spring (9) is installed above the compression screw (11). The pressure seat (8) equipped with a sealing ring is placed above the secondary safety spring (9), and the nut (5) is installed in the upper groove of the pressure seat (8) and tightened to the secondary safety pin (10). The service safety mechanism includes a service safety pin (16) and a horseshoe-shaped ring buckle.

2. The mechanical pull-fire delay gas generating device according to claim 1, characterized in that: The inner hole of the threaded end of the secondary safety pin (10) is assembled with a steel ball support spring (7) and a rolling steel ball (6), and is constrained by the tightened nut (5). The safety steel ball (14) is installed in two holes on the upper side wall of the firing pin (17).

3. The mechanical pull-fire delay gas generating device according to claim 1, characterized in that: The ignition component (20), the delay component (23), the main charge package (3), and the housing cover (1) respectively form independent components and assemblies.

4. A mechanical pull-ignition delay gas generating device according to claim 3, characterized in that: The housing cover (1) is a component, including a housing cover main body, a sealing aluminum foil, and a lateral exhaust hole, and is provided with a housing cover sealing ring (24).

5. A mechanical pull-fire delay gas generating device according to claim 1, characterized in that: The tip of the firing pin (17) is spherical, the tip diameter is φ0.6 - φ1.0mm, and the height is 1.0mm - 1.5mm.

6. The mechanical pull-ignition delay gas generating device according to claim 1, characterized in that: The secondary safety spring (9), the energy storage spring (13), and the primary safety spring (26) are all made of carbon spring steel.

7. A mechanical pull-fire delay gas generating device according to claim 1, characterized in that: The charge of the delay component (23) is tungsten-based delay charge, and the main charge package (3) is a mixture of small-grain black powder and high-energy ignition charge.

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