CN116291959A

CN116291959A - Ignition safety mechanism

Info

Publication number: CN116291959A
Application number: CN202310063336.1A
Authority: CN
Inventors: 赵承志; 陈发贵; 钟志文; 吴晓英
Original assignee: Wuhan Yanfeng Technology Co Ltd
Current assignee: Wuhan Yanfeng Technology Co Ltd
Priority date: 2023-01-19
Filing date: 2023-01-19
Publication date: 2023-06-23

Abstract

The application relates to the technical field of rocket engine ignition, in particular to an ignition safety mechanism, which comprises a body, two gas storage hoods, an electric control ignition unit, a safety plug unit, a piston and an electromagnetic action execution unit; the electromagnetic action executing unit and one of the gas storage covers are respectively connected to the two opposite end surfaces of the body in a sealing way, part of the electromagnetic action executing unit is connected with the piston, and the electromagnetic action executing unit is used for driving the piston to slide back and forth between a first position and a second position; a first channel, a second channel and a third channel are arranged in the piston body, and a T-shaped channel and an L-shaped channel are arranged in the piston body. The risk of misfiring can be effectively prevented to this application, and the reliability is very good and safe, adapts to various powerful impact forces after the ignition, and is durable and the operation is more stable.

Description

Ignition safety mechanism

Technical Field

The application relates to the technical field of rocket engine ignition, in particular to an ignition safety mechanism.

Background

Solid rocket motors (Solid propellant rocket engine) use solid propellant chemical rocket motors. Also known as solid propellant rocket engines. The solid propellant is burnt in the combustion chamber after being ignited, and chemical energy is converted into heat energy to produce high-temperature and high-pressure combustion products. The combustion products flow through the nozzle where the expansion accelerates, the thermal energy is converted to kinetic energy, and the kinetic energy is discharged from the nozzle at high velocity to generate thrust.

The solid rocket engine consists of a grain, a combustion chamber, a spray pipe assembly, an ignition device and the like. The cartridge is a hollow cylinder made of propellant and a small amount of additive (the hollow part is a combustion surface, and the cross-sectional shape of the hollow part is circular, star-shaped, etc.). The cartridge is placed in a combustion chamber (typically the engine housing). When the propellant burns, the combustion chamber is required to bear high temperature of 2500-3500 ℃ and high pressure of 102-2X 107bar, so the combustion chamber is required to be made of high-strength alloy steel, titanium alloy or composite material, and a heat insulation lining is arranged between the grain and the combustion inner wall.

The igniter is a starting device for the solid rocket engine, is the most dangerous part and is also the part which is most prone to failure, and generally consists of an electric ignition tube, gunpowder and a connecting seat.

One Chinese patent with the application number of 201911137927.9 discloses an electromagnetic mechanical safety type solid rocket engine igniter, wherein a set of electromagnetic mechanical safety is arranged in a gas fire transmission channel between a firing tube and a ignition cartridge in the igniter, the opening and closing of the gas fire transmission channel are controlled by controlling the electromagnetic mechanical safety through an electric signal, and the electromagnetic mechanical safety mainly comprises an electromagnetic chuck, an electromagnetic chuck power supply cable, a gas fire transmission channel valve and a spring; the electromagnetic mechanical safety is arranged in the connecting seat, the electromagnetic chuck is fixed with the connecting seat, one end of the spring is fixed on the connecting seat, the other end of the spring is fixed on the gas passage valve, the gas passage valve can reciprocate in the connecting seat under the action of the electromagnetic chuck and the spring, and a gas fire transmission passage is arranged in the gas passage valve.

With respect to the related art in the above, the inventors consider that there are the following drawbacks:

the ignition safety mechanism with conventional design is characterized in that the channel converter is only connected by a spring, and cannot resist impact vibration, so that the state is easily changed due to the impact vibration, and the potential safety hazard is high; in a safe state, only the outlet of the igniter is blocked, and if the igniter is ignited by mistake, the high-temperature and high-pressure gas does not exit, and the high-temperature and high-pressure gas can easily burst the whole mechanism.

Disclosure of Invention

The application provides an ignition safety mechanism to improve following technical problem:

The application provides an ignition safety mechanism, adopts following technical scheme:

an ignition safety mechanism comprises a body, two gas storage hoods, an electric control ignition unit, a piston, an electromagnetic action execution unit and a safety plug unit;

the electromagnetic action executing unit and one of the gas storage covers are respectively and hermetically connected to the two opposite end surfaces of the body, a part of the electromagnetic action executing unit is connected with the piston, and the electromagnetic action executing unit is used for driving the piston to slide back and forth between a first position and a second position;

the gas storage cover is arranged at one end of the second channel, which is far away from the sliding chamber, and the safety plug unit is arranged at one end of the third channel, which is far away from the sliding chamber;

a T-shaped channel and an L-shaped channel are arranged in the piston, a first safety hole, a second safety hole and a third safety hole are formed on the outer surface of the piston in the T-shaped channel, and a first working hole and a second working hole are formed on the outer surface of the piston in the L-shaped channel;

when the piston slides to a first position, the first channel, the L-shaped channel and the third channel are communicated in sequence; when the piston slides to the second position, the first channel, the T-shaped channel and the two gas storage covers are sequentially communicated.

Optionally, the insurance end cap unit includes stifled membrane frame, diaphragm, mounting and annular fluorosilicone rubber packing ring, the stifled membrane frame sealing installation is in the ignition passageway that high temperature high pressure gas passed through after the ignition, the one end that the stifled membrane frame is close to high temperature high pressure gas and gets into is provided with the mounting groove, the diaphragm is located the tank bottom of mounting groove, the mounting install in the mounting groove, the diaphragm press from both sides tightly in the tank bottom of mounting groove with between the mounting, stifled membrane frame with all be provided with the perforation that high temperature high pressure gas passed through on the mounting, annular fluorosilicone rubber packing ring presss from both sides to be located stifled membrane frame with between the body.

Optionally, the mounting includes gland and screw, the gland is annular structure, it is tubular structure to block up the membrane frame, be provided with a plurality of confession on the gland the through-hole that the screw passed, the tip that blocks up the membrane frame is provided with the screw hole, the through-hole with the screw hole one-to-one arranges, the screw pass in proper order the through-hole with behind the diaphragm screw thread assembly in the screw hole.

Optionally, the membrane is an aluminum foil, and the aluminum foil is broken when the gas pressure in the ignition channel is higher than 7 Mpa.

Optionally, the electromagnetic action executing unit is a bidirectional holding electromagnet, and a socket interface is arranged on the side part of the bidirectional holding electromagnet.

Optionally, the first passageway is Y shape, the first passageway is kept away from the one end of slip cavity sets up two openings, automatically controlled ignition unit is provided with two install respectively in two openings of first passageway department.

Optionally, a connecting cylinder is disposed on the end surface of the piston adjacent to the electromagnetic action executing unit.

Optionally, the two gas storage hoods, the electromagnetic action executing unit and the connection part of the body are all connected through a flange structure.

Optionally, an O-ring for sealing is arranged in the flange structure.

Optionally, the manufacturing material of the piston is copper alloy, and the manufacturing material of the two gas storage hoods is 2Cr13 which accords with GJB2294-95 standard.

In summary, the present application includes at least one of the following beneficial technical effects:

the electromagnetic action executing unit is started and drives the piston to slide, so that the switching and locking between the safe state and the working state can be realized, the structure is simple, the design is reasonable, fewer parts are needed, the structural strength of parts is high, the reliability is very good, the bidirectional holding type electromagnet is adopted, the state can be switched by only pulse power supply, and meanwhile, the bidirectional holding type electromagnet has very large holding force, can resist strong impact vibration, and is smaller in size and lighter in weight;

when the piston is in a safe state, if the electric control ignition unit fires by mistake, high-temperature high-pressure gas can reach the gas storage cover through the piston inner channel, the pressure of the high-temperature high-pressure gas can not exceed 7MPa because the volume of the gas storage cover is large enough, and the formed pressure is not large enough and can not break the diaphragm, so the ignition channel is still in a closed state and can not fire normally; when the piston is switched to a working state, the internal passage of the piston is directly communicated with the electric control ignition unit to reach the safety plug unit, the high-temperature and high-pressure gas at the moment hardly reaches the gas storage cover in a short time through the gap between the piston and the cavity, the high-temperature and high-pressure gas is mainly concentrated in the passage, the pressure in the passage can far exceed 7MPa, the diaphragm can be quickly broken, the ignition passage is in a communicating state, normal ignition is realized, and therefore the safety plug unit can effectively prevent the risk of false ignition and is safer.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an ignition safety mechanism in an embodiment of the present application.

Fig. 2 is a schematic cross-sectional structural view of an ignition safety mechanism in an embodiment of the present application.

Fig. 3 is a schematic view of the structure of the piston in the embodiment of the present application.

Fig. 4 is a schematic cross-sectional structure of a safety plug unit in an embodiment of the present application.

Reference numerals illustrate:

1. a body; 11. a sliding chamber; 12. a first channel; 13. a second channel; 14. a third channel; 2. a gas storage cover; 3. an electric control ignition unit; 4. a safety plug unit; 41. a membrane blocking frame; 42. a membrane; 43. a gland; 44. a screw; 5. a piston; 51. a T-shaped channel; 511. a first safety hole; 512. a second safety hole; 513. a third safety vent; 52. an L-shaped channel; 521. a first working hole; 522. a second working hole; 53. a connecting cylinder; 6. an electromagnetic action executing unit; 61. a socket interface; 7. a mounting plate; 71. a mounting hole; 8. a flange structure; 81. an O-ring.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

The present application is described in further detail below in conjunction with figures 1-4.

The embodiment of the application discloses an ignition safety mechanism. Referring to fig. 1, 2 and 3, the ignition safety mechanism comprises a body 1, two gas storage covers 2, an electric control ignition unit 3, a safety plug unit 4, a piston 5 and an electromagnetic action executing unit 6;

the inside of the body 1 is provided with a sliding chamber 11, openings at two ends of the sliding chamber 11 are respectively positioned on two opposite end surfaces of the body 1, the piston 5 is assembled in the sliding chamber 11 in a sliding way along the axial direction of the sliding chamber 11, a gap for realizing micro-sealing sliding connection between the piston 5 and the inner wall of the sliding chamber 11 is reserved between the piston 5 and one of the gas storage covers 2, the electromagnetic action execution unit 6 and one of the gas storage covers 2 are respectively connected on the two opposite end surfaces of the body 1 in a sealing way, part of the electromagnetic action execution unit 6 is connected with the piston 5, and the electromagnetic action execution unit 6 is used for driving the piston 5 to slide back and forth between a first position and a second position;

in order to avoid rotation when the piston 5 slides, a guide pin is arranged on the piston 5, a guide groove is arranged in the sliding chamber 11, and the piston 5 slides in the guide groove through the guide pin;

the body 1 is internally provided with a first channel 12, a second channel 13 and a third channel 14, the first channel 12 and the second channel 13 are respectively communicated with two opposite sides of the sliding chamber 11, the electric control ignition unit 3 is arranged at one end of the first channel 12 far away from the sliding chamber 11, the other gas storage cover 2 is arranged at one end of the second channel 13 far away from the sliding chamber 11, and the safety plug unit 4 is arranged at one end of the third channel 14 far away from the sliding chamber 11;

a T-shaped channel 51 and an L-shaped channel 52 are arranged in the piston 5, the T-shaped channel 51 is provided with a first safety hole 511, a second safety hole 512 and a third safety hole 513 on the outer surface of the piston 5, and the L-shaped channel 52 is provided with a first working hole 521 and a second working hole 522 on the outer surface of the piston 5;

when the piston 5 slides to the first position, the first passage 12, the L-shaped passage 52 and the third passage 14 are communicated in order, i.e., an operating state; when the piston 5 slides to the second position, the first passage 12, the T-shaped passage 51 and the two gas housings 2 are communicated in order, i.e., a safe state.

Because the 2 gas storage covers 2 are vertically arranged, the volume of each gas storage cover 2 can be designed to be smaller on the premise of ensuring a larger stored gas volume, and the size of the whole ignition safety mechanism can be made smaller, so that the ignition safety mechanism has very obvious small-volume advantage.

The electromagnetic action executing unit 6 is a bidirectional holding type electromagnet, the side part of the bidirectional holding type electromagnet is provided with a socket interface 61, the bidirectional holding type electromagnet does not need to be electrified for a long time, the state conversion can be completed only by short-time electrifying for less than 0.5 seconds, and the state can be kept unchanged after the power is off. Because the inside of the electromagnet adopts the neodymium-iron-boron permanent magnet with super-strong magnetic force, the holding force after power failure is very large enough to resist strong impact vibration.

The first channel 12 is Y-shaped, one end of the first channel 12 far away from the sliding chamber 11 is provided with two openings, and the electric control ignition unit 3 is provided with two openings which are respectively arranged at the two openings of the first channel 12

Through above-mentioned technical scheme, the structural design of piston 5 and body 1 is compacter, and spatial layout is more reasonable, not only makes things convenient for spare part earlier stage processing, later stage equipment, and two automatically controlled ignition units 3 can each other be reserve moreover, no matter be safe state, still operating condition, all very stable.

The end face of the piston 5, which is close to the electromagnetic action executing unit 6, is provided with a connecting cylinder 53, and the design of the connecting cylinder 53 is beneficial to firmly connecting the piston 5 with the telescopic rod of the electromagnetic action executing unit 6.

One side of the body 1, which is far away from the electric control ignition unit 3, is provided with a mounting plate 7, two sides of the mounting plate 7 are provided with a plurality of mounting holes 71, and the design of the mounting plate 7 is beneficial to the mounting and fixing of the whole ignition safety mechanism.

The two gas storage covers 2, the electromagnetic action execution unit 6 and the connection part of the body 1 are connected through the flange structure 8, and the O-shaped ring 81 used for sealing is arranged in the flange structure 8, so that the gas storage covers 2, the electromagnetic action execution unit 6 and the body 1 are firmly connected, and the gas tightness is very high.

The body 1 is made of titanium alloy, has very high mechanical structural strength and is relatively light in weight.

The material of the piston 5 is copper alloy, and the material of the piston 5 is aluminum bronze alloy in view of the principle that the design requirements are satisfied at the lowest cost. The aluminum bronze alloy has the advantages of good processing performance, high mechanical property, fatigue resistance, wear resistance, corrosion resistance, low temperature resistance, no spark occurrence during impact, and the like.

The gas storage cover 2 is made of 2Cr13 which accords with GJB2294-95 standard, has good processing performance and high mechanical property, is not easy to deform plastically, and is not easy to generate air leakage.

The ignition safety mechanism of the embodiment of the application is divided into two states:

safety state: even if the electric control ignition unit 3 is detonated by mistake at this time, when the piston 5 is in a safe state, if the electric control ignition unit 3 is detonated by mistake, high-temperature high-pressure gas can reach the gas storage cover 2 through the channel in the piston 5, the pressure of the high-temperature high-pressure gas can not exceed 7MPa because the volume of the gas storage cover 2 is large enough, and the membrane 42 (see fig. 4 in detail) can not be broken due to the fact that the formed pressure is not large enough, so that the ignition channel is still in a closed state and can not be ignited normally; but the high-temperature high-pressure gas generated by the electric control ignition unit 3 is closed in the ignition safety mechanism and cannot reach the ignition powder box (connected to the outer end of the third channel 14), so that the powder box cannot be ignited, and the solid rocket engine is ensured not to be ignited by mistake;

when the piston 5 is switched to the working state, the channel in the piston 5 is directly communicated with the electric control ignition unit 3 to reach the safety plug unit 4, the high-temperature and high-pressure gas at the moment is difficult to reach the gas storage cover 2 in a short time through the piston 5 and a cavity gap, the high-temperature and high-pressure gas is mainly concentrated in the channel, the pressure in the channel can be far more than 7MPa, the diaphragm 42 (see figure 4 in detail) can be quickly broken, so that the ignition channel is in a communicating state, normal ignition is realized, the electric control ignition unit 3 is detonated, the gunpowder box is directly ignited, an ignition engine connected with the gunpowder box is ignited, then the main engine is ignited, and the solid rocket engine is successfully ignited.

The ignition safety mechanism has two functions:

safety state: even if the electric control ignition unit 3 is detonated by mistake, the solid rocket engine is ensured not to be ignited;

in the operating state, if the electrically controlled ignition unit 3 is detonated at this time, successful ignition is ensured.

Therefore, through starting electromagnetic action execution unit 6 and driving piston 5 to slide, can realize switching and locking between safe state to the operating condition, simple structure and reasonable in design, required part is less, spare part structural strength is high, and the reliability is very good, can adapt to various powerful impact forces, and is more durable and the operation is more stable.

Referring to fig. 3 and 4, the safety plug unit 4 includes a film blocking frame 41, a diaphragm 42, a fixing member and an annular fluorosilicone rubber gasket 45, the film blocking frame 41 is installed in an ignition channel through which high temperature and high pressure gas passes after ignition in a sealing manner, one end of the film blocking frame 41, which is close to the inlet of the high temperature and high pressure gas, is provided with an installation groove, the diaphragm 42 is arranged at the bottom of the installation groove, the fixing member is installed in the installation groove, the diaphragm 42 is clamped between the bottom of the installation groove and the fixing member, the film blocking frame 41 and the fixing member are provided with through holes through which the high temperature and high pressure gas passes, the annular fluorosilicone rubber gasket 45 is clamped between the film blocking frame 41 and the body 1, and the annular fluorosilicone rubber gasket 45 has a thickness of about 1.5 mm, and when the safety plug unit 4 is installed, the annular fluorosilicone rubber gasket 45 is extruded, thereby increasing the sealing effect.

The mounting includes gland 43 and screw 44, and gland 43 is annular structure, and stifled membrane frame 41 is tubular structure, is provided with a plurality of through-holes that supply screw 44 to pass on the gland 43, and the tip of stifled membrane frame 41 is provided with the screw hole, and through-hole and screw hole one-to-one are arranged, and screw 44 passes through the screw hole in proper order and the screw thread assembly in the screw hole behind diaphragm 42.

The diaphragm 42 is aluminum foil which is broken when the gas pressure in the ignition channel is higher than 7 Mpa.

The safety plug unit 4 is additionally arranged in the ignition channel, when the high-temperature and high-pressure gas is not much, the pressure formed by the safety plug unit is not high enough, and the diaphragm 42 is difficult to break, so that the ignition channel is still in a closed state and cannot normally ignite, when the high-temperature and high-pressure gas is much, the pressure formed by the safety plug unit is very high, and the diaphragm 42 can be rapidly broken, so that the ignition channel is in a communicating state, and normal ignition is realized, and therefore, the safety plug unit 4 can effectively prevent the risk of false ignition and is safer.

Since the piston 5 and the sliding chamber 11 are not completely sealed, but have a certain clearance, this application is called "micro-sealing".

In the safe state, high-temperature and high-pressure gas slightly leaks onto the membrane plugging frame 41 and the membrane 42 (namely the safety plug unit 4), but most of the high-temperature and high-pressure gas reaches the gas storage cover 2 at the moment, the volume of the gas storage cover 2 is designed to be about 103ml, and the pressure of the high-temperature and high-pressure gas cannot exceed 7MPa at the moment, so that the membrane 42 cannot be broken through;

in the working state, at this time, the first channel 12, the third channel 51 and the second channel 13 are sequentially communicated (i.e. ignition channel) and aligned with the membrane 42, and even if part of high-temperature and high-pressure gas passes through the gap between the piston 5 and the sliding chamber 11, the gas can leak to the gas storage cover, but the pressure in the ignition channel is still much higher than 7MPa, the membrane 42 can be broken easily, and thus the gunpowder box is ignited.

In this application, the electric control ignition unit 3 may be a common electric control explosion bolt, the electromagnetic action execution unit 6 is a bidirectional holding electromagnet in this embodiment, and after the electromagnet is powered off, the electromagnet has a great holding force, and even if the device receives impact vibration, the piston state will not be changed, and in other embodiments, the electromagnetic action execution unit 6 may also be a common electric control push rod or a cylinder-like, cylinder-like telescopic member.

Because the application adopts the micro-sealing technology, an O-ring is not needed on the piston 5 to seal (full sealing), and meanwhile, the sliding conversion of the piston 5 is very smooth, and almost no resistance exists. Because the resistance is very little, so this application can only adopt two-way keep formula electro-magnet to stimulate piston 5 and do the state and switch, compare in common electromagnet, need not the long-time power supply can work, can further save the electric quantity, safer to this kind of equipment that rises of rocket engine.

If instead of the "micro-sealing" technique a "full seal" is used (i.e. an O-ring has been applied to the piston 5 to seal), there is no way to drive by an electromagnet, but only by a motor. The driving force of the motor is larger than that of the electromagnet, but the action speed is very slow, the requirement of quick conversion cannot be met, and the motor and the speed reducing mechanism have complex structure, high failure rate, far lower low-temperature performance than that of the electromagnet and very high cost.

The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims

1. The ignition safety mechanism is characterized by comprising a body (1), two gas storage covers (2), an electric control ignition unit (3), a piston (5), an electromagnetic action execution unit (6) and a safety plug unit (4);

the electromagnetic action device comprises a body (1), wherein a sliding cavity (11) is arranged in the body (1), openings at two ends of the sliding cavity (11) are respectively positioned on two opposite end surfaces of the body (1), a piston (5) is assembled in the sliding cavity (11) in a sliding manner along the axial direction of the sliding cavity (11), a gap for realizing micro-sealing sliding connection between the piston (5) and the inner wall of the sliding cavity (11) is reserved between the piston and the inner wall of the sliding cavity, an electromagnetic action executing unit (6) and one of the gas storage covers (2) are respectively connected onto two opposite end surfaces of the body (1) in a sealing manner, part of the electromagnetic action executing unit (6) is connected with the piston (5), and the electromagnetic action executing unit (6) is used for driving the piston (5) to slide back and forth between a first position and a second position;

the gas storage device is characterized in that a first channel (12), a second channel (13) and a third channel (14) are arranged in the body (1), the first channel (12) and the second channel (13) are respectively communicated with two opposite sides of the sliding chamber (11), the electric control ignition unit (3) is arranged at one end, far away from the sliding chamber (11), of the first channel (12), the other gas storage cover (2) is arranged at one end, far away from the sliding chamber (11), of the second channel (13), and the safety plug unit (4) is arranged at one end, far away from the sliding chamber (11), of the third channel (14);

a T-shaped channel (51) and an L-shaped channel (52) are arranged in the piston (5), a first safety hole (511), a second safety hole (512) and a third safety hole (513) are formed on the outer surface of the piston (5) in the T-shaped channel (51), and a first working hole (521) and a second working hole (522) are formed on the outer surface of the piston (5) in the L-shaped channel (52);

when the piston (5) slides to a first position, the first channel (12), the L-shaped channel (52) and the third channel (14) are communicated in sequence; when the piston (5) slides to the second position, the first channel (12), the T-shaped channel (51) and the two gas storage covers (2) are communicated in sequence.

2. The ignition safety mechanism according to claim 1, wherein the safety plug unit (4) comprises a film blocking frame (41), a diaphragm (42), a fixing piece and an annular fluorosilicone rubber gasket (45), the film blocking frame (41) is installed in an ignition channel through which high-temperature and high-pressure gas passes after ignition in a sealing mode, an installation groove is formed in one end, close to the high-temperature and high-pressure gas inlet, of the film blocking frame (41), the diaphragm (42) is arranged at the bottom of the installation groove, the fixing piece is installed in the installation groove, the diaphragm (42) is clamped between the bottom of the installation groove and the fixing piece, high-temperature and high-pressure gas passing through holes are formed in the film blocking frame (41) and the fixing piece, and the annular fluorosilicone rubber gasket (45) is clamped between the film blocking frame (41) and the body (1).

3. The ignition safety mechanism according to claim 2, wherein the fixing member comprises a gland (43) and screws (44), the gland (43) is of an annular structure, the membrane blocking frame (41) is of a cylindrical structure, a plurality of through holes for the screws (44) to pass through are formed in the gland (43), threaded holes are formed in the end portions of the membrane blocking frame (41), the through holes and the threaded holes are arranged in a one-to-one correspondence mode, and the screws (44) sequentially pass through the through holes and the membrane (42) and then are assembled in the threaded holes in a threaded mode.

4. A fire safety mechanism according to claim 3, characterized in that the membrane (42) is aluminium foil, which is broken when the gas pressure in the fire channel is higher than 7 Mpa.

5. Ignition safety mechanism according to claim 1, characterized in that the electromagnetic action execution unit (6) is a bi-directional holding electromagnet, the sides of which are provided with socket interfaces (61).

6. The ignition safety mechanism according to claim 1, wherein the first channel (12) is Y-shaped, two openings are provided at one end of the first channel (12) away from the sliding chamber (11), and two electronically controlled ignition units (3) are provided at two openings respectively mounted at the first channel (12).

7. Ignition safety mechanism according to claim 1, characterized in that the piston (5) is provided with a connecting cylinder (53) adjacent to the end face of the electromagnetic action performing unit (6).

8. Ignition safety mechanism according to claim 1, characterized in that the connection of the two gas reservoirs, the electromagnetic action execution unit (6) and the body (1) is connected by a flange structure (8).

9. Ignition safety mechanism according to claim 8, characterized in that an O-ring (81) for sealing is provided in the flange structure (8).

10. Ignition safety mechanism according to any one of claims 1 to 9, characterized in that the piston (5) is made of copper alloy and the two gas reservoirs (2) are made of 2Cr13 meeting the standard GJB 2294-95.