Two-stage gas generator for ejection and control method thereof

Abstract

A two-stage gas generator for ejection comprises a barrel, a first gas generation assembly and a second gas generation assembly. The first gas generation assembly comprises a first igniter, a first rupture disk and a throttling valve. The second gas generation assembly comprises a second igniter and a second rupture disk. The first igniter comprises an electric detonator I which is used for blasting the first rupture disk to enable high-pressure inert gas in the barrel body to sequentially flow through a third gas guide hole in the throttling valve, the position of the first rupture disk and a first gas guide hole in the first igniter to enter a working chamber in the launching barrel; the second igniter comprises a second electric detonator which is used for blasting the second rupture disk to be matched with the first igniter so that the remaining high-pressure inert gas in the barrel can enter the working cavity in the launching barrel through the position of the second rupture disk and a second gas guide hole in the second igniter. The device can meet the initial low overload requirement of a launched object in the takeoff stage and the cylinder outlet speed requirement in the middle and later periods, is simple in structure and light in weight, and a generated pushing air source is clean and free of residues and cannot expose a launching point.

Description

Technical Field

[0001] The present invention relates to the field of ejection technology, in particular to a gas generator. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] In modern warfare, drones, missiles and other products play an increasingly important role. The ejection launch methods of drones, missiles and other products mainly include high-pressure cold air ejection, rocket ejection, barreled artillery ejection and other methods. The advantage of using high-pressure cold air ejection is that the launch of the product is not affected by temperature, the overload curve has good consistency at high and low temperatures, the cost is low, and the gas is clean and has no residue.

[0004] The inventor has found through research that the current high-pressure cold gas ejection is mainly achieved by directly connecting the high-pressure gas cylinder to the launch tube through a pipeline, and controlling the switch through a solenoid valve. Due to the limitations of the pipeline diameter and the working time of the solenoid valve, the gas pressure in the gas cylinder is lost when it is provided to the ejection product, the working efficiency is low, the device structure is complex, and the weight is large. In addition, the current common ejection device is mainly powered by the combustion of the propellant, which mainly relies on the medicine type and formula to ensure the speed and overload required for the ejection, but it is expensive, and the high-temperature combustion gas generated during the launch easily exposes the launch point, thereby exposing the launch point. Therefore, a new type of high-pressure cold gas ejection device is needed to meet the needs of modern warfare. Summary of the invention

[0005] In order to solve the above problems existing in the background technology, the present invention provides a two-stage gas generator for ejection, which can achieve low ejection cost, light weight, clean gas without residue, and the output performance curve is not affected by the ambient temperature.

[0006] The present invention is realized through the following technical scheme: a two-stage gas generator for ejection, comprising a cylinder, a gas generating assembly 1 for meeting the initial low overload requirement of the ejection object in the take-off stage, and a gas generating assembly 2 for cooperating with the gas generating assembly 1 to meet the ejection object's exit speed requirement in the middle and late stages; the gas generating assembly 1 and the gas generating assembly 2 are respectively connected to the two ends of the cylinder; the gas generating assembly 1 comprises a first igniter, a first bursting disc, and a throttle valve; the first bursting disc is located between the first igniter and the throttle valve, and is connected to the first igniter; the throttle valve is located inside the cylinder, and is connected to the first igniter; the first igniter and the throttle valve are respectively provided with a first air guide hole, a third air guide hole, and a third air guide hole. Gas guide hole; the first igniter includes a base one, an electric squib installed in the base one for blasting the first bursting piece so that the high-pressure inert gas inside the cylinder flows through the third gas guide hole on the throttle valve, the first bursting piece position, the first gas guide hole and finally enters the working chamber in the launch tube; the gas generating assembly two includes a second igniter and a second bursting piece; the second bursting piece is located inside the cylinder and is connected to the second igniter; a second gas guide hole is provided on the second igniter; the second igniter includes a base two, an electric squib installed in the base two for blasting the second bursting piece so as to cooperate with the first igniter to make the remaining high-pressure inert gas inside the cylinder flow through the second bursting piece position and the second gas guide hole into the working chamber in the launch tube.

[0007] The area of ​​the first air guide hole is greater than the area of ​​the third air guide hole.

[0008] The area of ​​the second air guide hole is greater than the area of ​​the third air guide hole.

[0009] The electric squib is assembled in the base, and the assembly and fixation are completed by the flange of the base; the first bursting piece is located at the first step at the lower end of the electric squib; the throttle valve is pressed into the tail end of the base by interference fit and fixed.

[0010] The first bursting piece is fixed to the base by laser welding.

[0011] The second electric squib is assembled in the second base, and the assembly and fixation are completed by the flange of the second base; the second bursting piece is located at the first step at the lower end of the second electric squib.

[0012] The second bursting disc is fixed to the second base by laser welding.

[0013] The distance between the first igniter and the first bursting disc is between 1 mm and 5 mm.

[0014] The distance between the second igniter and the second bursting disc is between 1 mm and 5 mm.

[0015] The cylinder body is provided with an air filling port, and a high-pressure ball plug is installed at the air filling port.

[0016] On the other hand, the present invention also provides a control method for the above-mentioned two-stage gas generator for ejection: an ignition control signal is first sent to the first igniter, and the first igniter is activated after receiving the ignition command. The energy excited by the electric squib directly acts on the first bursting disc. After the first bursting disc is ruptured, the high-pressure inert gas inside the cylinder will flow through the third air guide hole on the throttle valve, the first bursting disc position, and the first air guide hole in sequence, and finally enter the launch tube; the area of ​​the third air guide hole is smaller than that of the first air guide hole, and at this time, the high-pressure gas in the cylinder is slowly released to meet the low overload required by the initial ejection object;

[0017] As the working chamber increases, the area of ​​the single third gas guide hole is not enough to support the speed requirement for the ejection object to leave the tube. The ignition control signal continues to send instructions to the second igniter. After the second igniter receives the ignition instruction, the second electric squib is activated. The energy excited by the second electric squib directly acts on the second bursting piece. After the second bursting piece ruptures, the remaining high-pressure inert gas inside the cylinder will enter the launch tube through the second bursting piece position and the second gas guide hole. At this time, the first gas guide hole and the second gas guide hole release high-pressure gas into the launch tube at the same time. The pressures of the two are in a superimposed state, which can make the high-pressure gas in the tube be quickly released to meet the minimum initial exit speed requirement of the ejection object in the middle and late stages.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the bipolar gas generator provided by the present invention is used for the ejection device, which can meet the initial low overload requirement of the ejection object in the take-off stage and the tube exit speed requirement in the middle and late stages, and has a simple structure, light weight, and does not require a complex piping system; the generated propulsion gas source is clean and free of residue, and will not expose the launch point; compared with propellant-type pyrotechnic agents, the present invention is filled with inert gas inside, and the output thrust performance is basically not affected by the high and low temperatures of the environment, and the performance is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

[0021] Figure 2 is a schematic structural diagram of a first igniter;

[0022] Figure 3 is a schematic diagram of the structure of the second igniter;

[0023] Figure 4The second structural diagram of the first igniter;

[0024] Figure 5 This is the second structural schematic diagram of the second igniter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present invention.

[0026] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0027] like Figure 1 As shown, this embodiment provides a two-stage gas generator for ejection, including a cylinder 110, a gas generating assembly 1 for meeting the initial low overload requirement of the ejection object during the take-off phase, and a gas generating assembly 2 for cooperating with the gas generating assembly 1 to meet the ejection object's exit speed requirement in the middle and late stages. The gas generating assembly 1 and the gas generating assembly 2 are respectively connected to the two ends of the cylinder 110. The gas generating assembly 1 includes a first igniter 120, a first bursting disc 130, and a throttle valve 140, and the gas generating assembly 2 includes a second igniter 150 and a second bursting disc 160.

[0028] The first igniter 120 and the second igniter 150 are connected to the two ends of the cylinder 110 respectively; the first bursting disc 130 is located between the first igniter 120 and the throttle valve 140, and is connected to the first igniter 120; the throttle valve 140 is located inside the cylinder and is connected to the first igniter; the second bursting disc 160 is located inside the cylinder and is connected to the second igniter 150; the first igniter, the second igniter, and the throttle valve are respectively provided with a first gas guide hole 121, a second gas guide hole 151, and a third gas guide hole 141. The first electric igniter 120 and the second electric igniter 150 work independently after receiving the ignition signal, and each opens the bursting disc, so that the high-pressure gas in the cylinder is introduced into the launch cylinder through the gas guide hole, which is used to overload and eject drones, missiles and other products according to regulations.

[0029] like Figure 2As shown, the first igniter 120 includes a base 1, an electric squib 11 installed in the base 1 for blasting the first bursting disc 130 so that the high-pressure inert gas inside the cylinder flows through the third air guide hole 141 on the throttle valve 140, the position of the first bursting disc 130, the first air guide hole 121 and finally enters the working chamber in the launch tube. The electric squib 11 is assembled in the base 10, and the assembly and fixation are completed by the flange of the base 10. The first bursting disc 130 is located at the first step at the lower end of the electric squib 11, and is 1mm-5mm away from the end face of the electric squib. This distance has been verified to ensure the stability of the normal fragmentation of the bursting disc when the electric squib is working. The first bursting disc 130 is fixed to the base by laser welding or other methods, and can maintain good high-pressure sealing to ensure that the gas does not leak in the storage state. A complete gas channel is retained between the first bursting piece 130 and the electric squib 11, so that the high-pressure gas can be discharged smoothly during operation, and finally enter the working chamber through the first air guide hole 121 to complete the ejection of the specific overload.

[0030] The throttle valve 141 is pressed into the tail end of the base 1 by interference fit and fixed by laser welding or other methods. A third air guide hole 141 is opened at the center of the throttle valve 141. The area S of the third air guide hole 141 is 3 Smaller than the area S of the first air guide hole 121 1 .

[0031] like Figure 3 As shown, the second igniter 150 includes a base 2, an electric squib 2 installed in the base 2 for blasting the second bursting disc 160 to cooperate with the first igniter to allow the remaining high-pressure inert gas inside the cylinder to enter the working chamber in the launch tube through the position of the second bursting disc 160 and the second air guide hole 151. The electric squib 2 51 is assembled in the base 2 50, and the assembly and fixation are completed by the flange of the base 2 50. The second bursting disc 160 is located at the first step at the lower end of the electric squib 2 51, and is 1mm-5mm away from the end face of the electric squib 2 51. This distance has been verified by experiments and can ensure the stability of the normal fragmentation of the bursting disc when the electric squib is working. The second bursting disc 160 is fixed to the base by laser welding and other methods, which can maintain good high-pressure sealing to ensure that the gas does not leak in the storage state. A complete gas channel is also retained between the second bursting disc 160 and the electric squib 2, so that the high-pressure gas can be discharged smoothly during operation, and finally enter the working chamber through the second air guide hole 151 to complete the ejection of the specific overload.

[0032] like Figure 4 , Figure 5 As shown, the distance D1 between the first bursting disc and the electric squib 1 is between 1 mm and 5 mm, and the distance D2 between the second bursting disc and the electric squib 2 is between 1 mm and 5 mm.

[0033] After the first igniter 120 and the second igniter 150 are assembled, they are pressed into the left and right ends of the cylinder 110 by interference fit, and finally fixed by laser welding or other methods to ensure sealing under high pressure environment.

[0034] The cylinder 110 is also provided with an inflation port. After all parts are assembled, an inert gas of a certain pressure is filled into the inflation port through an inflator. Finally, a high-pressure ball plug 170 is used to seal the inflation port by resistance welding, thereby completing the assembly of the two-stage gas generator.

[0035] The bipolar gas generator is placed in the launch tube when in use. The launch tube is a prior art, and a piston is provided in the launch tube. The ejection object (unmanned aerial vehicle or missile, etc.) is placed on the upper part of the piston in the launch tube, and the bipolar gas generator is placed in the working chamber under the piston in the launch tube. After the bipolar gas generator is ignited, the gas generated pushes the piston upward, giving the ejection object an upward impulse to launch the ejection object.

[0036] The inventor has found through research that the thrust, speed and other indicators required for ejection missiles, drones, etc. should be small in the early stage and large in the later stage. If the pressure vessel has a fixed volume and only one air guide hole, according to the law of pressure release, the overload index of the ejection object will exceed a in the early stage of ejection. 0 , damaging the internal precision electronic components, and failing to reach the set minimum exit speed V due to insufficient thrust in the later stage of the ejection process 0 Therefore, the present invention chooses to open air guide holes at both ends at the same time. In the early stage of work, only a third air guide hole with a smaller area is opened to provide propulsion. As the internal pressure of the gas cylinder decreases, another second air guide hole with a larger area is opened after a certain interval. In this way, the exhaust of two air guide holes with different areas is superimposed at the same time, which can make up for the problem of insufficient thrust of a single air guide hole in the later stage, and finally achieve a specific ejection object in the whole working process without exceeding the maximum overload a 0 , and the tube exit speed is greater than V 0 requirements.

[0037] The ejection object generally has a slow overload requirement at first and then a fast overload requirement during the take-off phase. The control method of the two-stage gas generator for ejection of the present invention is as follows:

[0038] The ignition control signal is first sent to the first igniter 120. After the first igniter 120 receives the ignition command, the electric squib is activated. The energy excited by the electric squib directly acts on the first bursting disc 130. After the first bursting disc 130 ruptures, the high-pressure inert gas inside the cylinder 110 will flow through the third air guide hole 141 on the throttle valve 140, the position of the first bursting disc 130, and the first air guide hole 121 in sequence, and finally enter the launch tube to push the piston to move upward; because the area of ​​the third air guide hole 141 is smaller than that of the first air guide hole 121, the high-pressure gas in the cylinder 110 is slowly released at this time to meet the low overload required by the initial ejection object;

[0039] As the piston moves upward, the working chamber gradually increases. The area of ​​the single third air guide hole 141 is not enough to support the speed requirement of ejecting the object out of the tube. 1 At this moment, the ignition control signal continues to send instructions to the second igniter 150. After the second igniter 150 receives the ignition instruction, the second electric squib operates, and the energy excited by the second electric squib directly acts on the second bursting disc 160. After the second bursting disc 160 ruptures, the remaining high-pressure inert gas in the cylinder 110 will enter the launch tube through the position of the second bursting disc 160 and the second gas guide hole 151; at this time, the first gas guide hole 121 and the second gas guide hole 151 simultaneously release high-pressure gas into the launch tube, and the pressures of the two are in a superimposed state, so that the high-pressure gas in the tube can be quickly released to meet the minimum initial exit speed V required by the ejection object in the middle and late stages. 0 The requirement is that the pressure superposition of the two lasts for t 2 .

[0040] t 1 ,t 2 , the area S of the second air guide hole 2 , the area of ​​the third air guide hole S 3 The relationship is as follows:

[0041]

[0042]

[0043] In the above formula: S 2 is the effective area of ​​the second air guide hole, m 2 ; S 3 is the effective area of ​​the third air guide hole, m 2 ;P 1 is the initial filling pressure inside the gas generator, MPa; P 2 is the gas pressure inside the gas generator when the second gas guide hole is opened, MPa; P 3 It is the equilibrium pressure inside the working chamber when the piston stroke reaches the maximum, MPa; P a is the pressure in the working chamber of the launch tube, MPa; usually t 1 The internal pressure of the generator is P 1 Down to P 2 Time required, ms; t 2 The internal pressure of the generator is P 2 Down to P 3 The time required, ms; m is the mass of the ejected object, kg; A is the cross-sectional area of ​​the piston, m 2 ; V is the volume of the gas generator, m 3 ; V 0 is the target initial velocity of the ejection object, m / s; T s is the initial temperature of the gas in the gas generator, K; a 0 is the maximum overload required for the ejection object, g; γ-specific heat ratio, monatomic gas is 1.66, diatomic gas is 1.4, and the gas constant of triatomic gas and above is approximately 1.33.

[0044] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage gas generator for ejection, characterized in that: It comprises a barrel (110), a gas generating assembly 1 for meeting the initial low overload requirement of the ejection object in the take-off phase, and a gas generating assembly 2 for cooperating with the gas generating assembly 1 to meet the ejection object's exit speed requirement in the middle and late stages; The gas generating assembly 1 and the gas generating assembly 2 are respectively connected to two ends of the cylinder (110); The gas generating assembly 1 comprises a first igniter (120), a first bursting disc (130), and a throttle valve (140); the first bursting disc (130) is located between the first igniter (120) and the throttle valve (140), and is connected to the first igniter (120); the throttle valve (140) is located inside the cylinder, and is connected to the first igniter (120); the first igniter (120) and the throttle valve (140) are respectively provided with a first gas guide hole (121) and a third gas guide hole (141); The first igniter (120) comprises a base 1, an electric squib 1 (11) mounted in the base 1 and used for bursting the first bursting disc (130) so that the high-pressure inert gas inside the barrel flows sequentially through the third air guide hole (141) on the throttle valve (140), the position of the first bursting disc (130), the first air guide hole (121) and enters the working chamber in the launch tube; The second gas generating assembly comprises a second igniter (150) and a second bursting disc (160); the second bursting disc (130) is located inside the cylinder (110) and connected to the second igniter (150); the second igniter (150) is provided with a second gas guide hole (151); The second igniter (150) comprises a second base, and a second electric squib (51) installed in the second base for blasting a second bursting disc (160) to cooperate with the first igniter to allow the remaining high-pressure inert gas inside the barrel to enter the working chamber in the launch tube through the second bursting disc (160) and the second gas guide hole (151).

2. A two-stage gas generator for ejection according to claim 1, characterized in that: The area of ​​the first air guide hole (121) is greater than the area of ​​the third air guide hole (141).

3. A two-stage gas generator for ejection according to claim 1, characterized in that: The electric squib is assembled in the base and fixed by flanging the base; the first bursting piece (130) is located at the first step at the lower end of the electric squib; the throttle valve (141) is pressed into the rear end of the base by interference fit and fixed.

4. A two-stage gas generator for ejection according to claim 3, characterized in that: The first bursting disc (130) is fixed to the base by laser welding.

5. A two-stage gas generator for ejection according to claim 1, characterized in that: The second electric squib is assembled in the second base and is assembled and fixed by flanging the second base; the second bursting piece (160) is located at the first step at the lower end of the second electric squib.

6. A two-stage gas generator for ejection according to claim 5, characterized in that: The second bursting disc (160) is fixed to the second base by laser welding.

7. A two-stage gas generator for ejection according to claim 1, characterized in that: The distance between the first igniter (120) and the first bursting disc (130) is between 1 mm and 5 mm.

8. A two-stage gas generator for ejection according to claim 1, characterized in that: The distance between the second igniter (150) and the second bursting disc (160) is between 1 mm and 5 mm.

9. A two-stage gas generator for ejection according to claim 1, characterized in that: The cylinder (110) is provided with an air filling port, and a high-pressure ball plug is installed at the air filling port.

10. A control method for a two-stage gas generator for ejection according to any one of claims 1 to 9, characterized in that: An ignition control signal is first sent to the first igniter (120). After the first igniter (120) receives the ignition command, the electric squib is activated. The energy energized by the electric squib directly acts on the first bursting disc (130). After the first bursting disc (130) is ruptured, the high-pressure inert gas inside the cylinder (110) flows sequentially through the third air guide hole (141) on the throttle valve (140), the position of the first bursting disc (130), and the first air guide hole (121), and finally enters the launch tube. The area of ​​the third air guide hole (141) is smaller than that of the first air guide hole (121). At this time, the high-pressure gas in the cylinder (110) is slowly released to meet the low overload initially required by the ejection object. As the working chamber increases in size, the area of ​​the single third air guide hole (141) is insufficient to support the speed requirement for the ejection object to exit the tube. The ignition control signal continues to send instructions to the second igniter (150). After the second igniter (150) receives the ignition instruction, the second electric squib is activated. The energy excited by the second electric squib directly acts on the second bursting disc (160). After the second bursting disc (160) ruptures, the remaining high-pressure inert gas inside the barrel (110) enters the launch tube through the position of the second bursting disc (160) and the second air guide hole (151). At this time, the first air guide hole (121) and the second air guide hole (151) simultaneously release high-pressure gas into the launch tube. The pressures of the two are in a superimposed state, so that the high-pressure gas in the tube can be quickly released to meet the minimum initial exit speed requirement of the ejection object in the middle and late stages.

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