Gap maintaining type pyrotechnically actuated separation and unlocking device

Abstract

A gap maintaining type pyrotechnically actuated separation and unlocking device. A front load bearing cylinder (2) is connected to a front flange (1), a rear load bearing cylinder (5) is connected to a rear flange (13), a combustion chamber (11) is connected to the rear flange (13), and an igniter (14) is mounted on an end face of the combustion chamber (11); a support tube (6) is in clearance fit with an inner hole of the rear flange (13); a two-way clamping ring (4) and a one-way clamping ring (3) are fitted over the support tube (6) and serve as load bearing members for supporting the front load bearing cylinder (2) and the rear load bearing cylinder (5), and the one-way clamping ring (3) is cooperatively attached to a bevel of the front load bearing cylinder (2); a positioning ring (16) is connected to a connection tube (15), and simultaneously, the one-way clamping ring (3) is pressed, thereby implementing pre-tightening between the one-way clamping ring (3) and the front load bearing cylinder (2) and pre-tightening between the two-way clamping ring (4) and the rear load bearing cylinder (5); a connection base (10) is connected to the combustion chamber (11), an inner wall of the connection tube (15) is in clearance fit with the connection base (10), and the connection tube (15) and the support tube (6) are located on an inner side of the combustion chamber (11) and are in clearance fit with each other; and a piston disc (9) is connected to the support tube (6), and the piston disc (9) is in clearance fit with an outer diameter of a long tube in the combustion chamber (11). A pyrotechnic system, comprising the gap maintaining type pyrotechnically actuated separation and unlocking device. In this way, the device has the characteristics of high bearing capacity, small unlocking impact and having no separation impulse, and thus is suitable for connection and separation of satellite-satellite and satellite-rocket.

Description

A gap-maintaining pyrotechnic separation and unlocking device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 19, 2023, with application number 202311752228.1 and application name “A Gap-Maintaining Pyrotechnic Separation and Unlocking Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of satellite-rocket separation or star separation, and in particular to a gap-maintaining pyrotechnic separation and unlocking device. Background Art

[0003] While in orbit, spacecraft often connect and separate from rockets or satellites. Currently, this separation process primarily involves pyrotechnic and non-pyrotechnic separation. With the advancement of aerospace technology, a requirement has emerged for the release and separation of rockets or satellites: after release, the rocket or satellite must remain in its initial position to minimize interference with the separated equipment. However, to prevent mutual interference, a certain gap must be created at the separation surface.

[0004] This working condition places the following functional requirements on the unlocking device: first, the unlocking device is required to provide three-dimensional load-bearing and stiffness in tension, compression and shear to ensure that the rocket or star can withstand the mechanical environment during turnover and launch; second, the unlocking device is required to form a certain gap on the separation surface when working, rather than driving the connected objects to move to create a gap; third, the working impact is required to be as small as possible, and no debris or other excess objects are flying out to avoid damage to the precision equipment on the satellite; finally, the separation impulse is required to be small to facilitate the rocket or star to maintain its initial position.

[0005] Summary of the Invention

[0006] The present application provides a gap-retaining pyrotechnic separation and unlocking device, the purpose of which is to provide a gap-retaining connection and unlocking mechanism with high bearing capacity, small unlocking impact, and no separation impulse, which is particularly suitable for the connection and separation of stars or star-rocket.

[0007] In a first aspect, a gap-retention type pyrotechnic separation and unlocking device is provided, comprising a front flange, a support tube, a piston disc, a connecting seat, a combustion chamber, a rear flange, and an igniter; the front flange and the rear flange are used to be installed on two parts to be separated of the pyrotechnic system;

[0008] The rear flange includes a rear flange end portion and a rear flange barrel portion, and the rear flange end portion is used to be mounted on the pyrotechnic system;

[0009] The combustion chamber is fixedly connected to the end of the rear flange and is installed in the cylindrical portion of the rear flange; the first end of the combustion chamber is used to install the igniter, and the igniter is used to fill the cavity of the combustion chamber with gas; the second end of the combustion chamber is provided with the connecting seat; the outer wall of the cavity of the combustion chamber is provided with an annular piston disk, and the piston disk can slide relative to the combustion chamber;

[0010] The connecting seat includes a first connecting portion, which is cylindrical and fixedly connected to the combustion chamber. The inner cavity of the first connecting portion is connected to the inner cavity of the combustion chamber. The first connecting portion is provided with a connecting hole on a side away from the igniter. The connecting hole is located outside the combustion chamber. The cavity of the combustion chamber is connected to the space on the left side of the piston disc through the connecting hole.

[0011] The outer wall of the piston disc is fixedly connected to the first end of the support tube with a thread, the outer periphery of the support tube is matched with the inner wall of the rear flange cylinder, and the support tube can slide relative to the rear flange cylinder;

[0012] The front flange includes a front flange end and a front flange barrel; the front flange end is used to be installed on a pyrotechnic system; before the front flange and the rear flange are unlocked, the front flange barrel and the support pipe are cross-overlapped and docked.

[0013] In combination with the first aspect, in certain implementations of the first aspect, during operation, the igniter outputs high-pressure gas, the gas acts on the piston disk, and the piston disk drives the support tube to move along the inner wall of the rear flange toward the igniter.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the apparatus further includes:

[0015] A connecting tube is arranged in the inner cavity of the support tube; the middle part of the support tube has an annular support tube protrusion protruding inward, and the connecting tube has an annular connecting tube protrusion protruding outward on the side of the support tube protrusion close to the igniter, and the outer diameter of the connecting tube protrusion is larger than the inner diameter of the support tube protrusion; on the side of the support tube protrusion close to the igniter, the inner wall of the support tube and the outer peripheral clearance of the connecting tube protrusion are matched; on the side of the connecting tube protrusion away from the igniter, the outer wall of the connecting tube and the inner wall of the support tube protrusion are matched.

[0016] In combination with the first aspect, in certain implementations of the first aspect, during the unlocking process, when the support tube moves toward the igniter, the support tube protrusion slides on the connecting tube until the support tube protrusion contacts the connecting tube protrusion; thereafter, the connecting tube moves along the outer wall of the combustion chamber, driven by the support tube, in a direction away from the front flange.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the connecting seat further includes a second connecting portion, and the second connecting portion is located outside the combustion chamber;

[0018] The inner wall of the connecting pipe and the outer periphery of the second connecting portion are loosely matched, and the connecting pipe can slide relative to the connecting seat.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the connecting pipe has a central through hole at the end close to the igniter, and the inner diameter of the central through hole is smaller than the outer diameter of the second connecting part and larger than the outer diameter of the combustion chamber.

[0020] In combination with the first aspect, in certain implementations of the first aspect, in an unlocked state, the connecting pipe and the piston disc are spaced apart.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the device further includes a front bearing cylinder, a bidirectional clamping ring, and a rear bearing cylinder;

[0022] The front bearing cylinder is fixed to the front flange cylinder portion, and the rear bearing cylinder is fixed to the rear flange cylinder portion. When in an unlocked state, the bidirectional clamping ring is sleeved on the support tube and clamped between the front bearing cylinder and the rear bearing cylinder;

[0023] The free outer diameter of the bidirectional clamping ring is smaller than the inner diameter of the rear bearing cylinder; when the bidirectional clamping ring is installed on the support tube, the outer diameter of the bidirectional clamping ring is larger than the inner diameter of the front bearing cylinder and also larger than the inner diameter of the rear bearing cylinder.

[0024] In combination with the first aspect, in certain implementations of the first aspect, as the support tube moves toward the igniter, the support tube gradually moves into the inner cavity of the rear bearing cylinder, retracts inward after the bidirectional clamping ring is separated from the support tube, and moves with the connecting tube.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the device further comprises a positioning ring and a one-way snap ring; the positioning ring is fixedly connected to the connecting tube, and when unlocked, the positioning ring is located in the inner cavity of the front bearing cylinder; the one-way snap ring is sleeved on the support tube and clamped between the positioning ring and the front bearing cylinder;

[0026] The free outer diameter of the one-way snap ring is smaller than the inner diameter of the front bearing cylinder and also smaller than the inner diameter of the rear bearing cylinder; when the one-way snap ring is mounted on the support tube, the outer diameter of the one-way snap ring is larger than the inner diameter of the front bearing cylinder.

[0027] In combination with the first aspect, in certain implementations of the first aspect, as the support tube moves toward the igniter, the support tube gradually moves out of the inner cavity of the front bearing cylinder, retracts inward after the one-way clamping ring is separated from the support tube, and moves with the positioning ring.

[0028] In combination with the first aspect, in certain implementations of the first aspect, a chamfer is provided on an outer periphery of a side of the combustion chamber facing away from the igniter.

[0029] In combination with the first aspect, in certain implementations of the first aspect, the device further includes a shear pin; in an unlocked state, the shear pin passes through the side wall of the rear flange and is fixedly connected to the threaded hole of the support tube.

[0030] In combination with the first aspect, in certain implementations of the first aspect, the device further includes a wire retaining ring, which is sleeved within the annular groove of the support tube, the annular groove being located at one end of the support tube close to the igniter, and the outer diameter of the wire retaining ring in a free state is larger than the outer diameter of the support tube; a step circle is provided on the inner side of the rear flange close to the end of the igniter for accommodating the wire retaining ring that elastically expands outward, and when the wire retaining ring is located within the step circle, the inner diameter of the wire retaining ring is smaller than the outer diameter of the support tube.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the device further includes a buffer member fixed to a position inside the combustion chamber close to the igniter, for buffering energy after impact with the piston disc.

[0032] In a second aspect, a pyrotechnic system is provided, which includes a gap-retaining pyrotechnic separation and unlocking device as described in any one of the implementations of the first aspect.

[0033] Compared with the existing technology, the solution provided by this application includes at least the following beneficial technical effects:

[0034] (1) The present application adopts a double-ring structure to realize the gap-maintained separation and unlocking, which has no separation impulse and no superfluous objects in the separation gap. Compared with the traditional gapless separation or negative gap separation, the complete separation of the fixed object can be ensured without providing additional displacement, which greatly reduces the interference with the separated object (front flange end).

[0035] (2) The double retaining ring load-bearing structure adopted in this application has a larger envelope circle of the bearing parts compared to the traditional split nut structure, and the bending resistance is greatly improved under the same axial preload; at the same time, the multi-layer tubular structure is used to jointly resist shear, which has a stronger radial bearing capacity than the single screw of the split nut subjected to shear.

[0036] (3) This application utilizes the difference in the effective areas of several pistons between the support tube, the connecting tube, and the combustion chamber to make the effective area of ​​the gas during the unlocking process much larger than the effective area when it is retracted after unlocking. This not only ensures the reliability of unlocking, but also greatly limits the work done by the gas. Assisted by the buffer component to absorb excess kinetic energy, the working impact of the unlocking device is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the applicant organization.

[0038] Figure 2 is a schematic diagram of the one-way clamp structure of this application.

[0039] FIG3 is a schematic diagram of the bidirectional clamping ring structure of the present application.

[0040] FIG4 is a schematic structural diagram of the moment when the retaining ring is unlocked in this application.

[0041] Figure 5 is a schematic diagram of the structure of this application after complete unlocking and separation. DETAILED DESCRIPTION

[0042] The present application is described in further detail below with reference to the accompanying drawings and specific embodiments.

[0043] As shown in Figure 1, the present application discloses a gap-retaining pyrotechnic release and unlocking device, comprising a front flange 1, a support tube 6, a piston plate 9, a connecting seat 10, a combustion chamber 11, a rear flange 13, and an igniter 14. The front flange 1 and rear flange 13 are mounted on the two components of the pyrotechnic system to be separated. This gap-retaining pyrotechnic release and unlocking device is used to release the connection between the front flange 1 and rear flange 13, maintaining relative fixity between the front and rear flanges before and after separation.

[0044] The rear flange 13 may include a rear flange end and a rear flange barrel. The rear flange end may be mounted on a pyrotechnic system. The combustion chamber 11 is connected to the rear flange end of the rear flange 13 via threads and is installed in the rear flange barrel. The igniter 14 is mounted on the first end of the combustion chamber 11 and is used to fill the cavity of the combustion chamber 11 with fuel gas. The second end of the combustion chamber 11 is provided with a connecting seat 10, which is connected to the combustion chamber 11 via threads. The connecting seat 10 may include a first connecting part and a second connecting part. The first connecting part is cylindrical and is threadedly connected to the combustion chamber 11. The inner cavity of the first connecting part is connected to the inner cavity of the combustion chamber 11. Therefore, the fuel gas generated by the igniter 14 can enter the first connecting part of the connecting seat 10. The second connecting part is located outside the combustion chamber 11.

[0045] A piston disc 9 is provided on the outer wall of the combustion chamber 11. The piston disc 9 can be annular, and the inner wall of the piston disc 9 is loosely matched with the outer wall of the combustion chamber 11 so that the piston disc 9 can slide relative to the combustion chamber 11, and a dynamic seal is achieved through the O-ring 19. The outer wall of the piston disc 9 is fixedly connected to the first end of the support tube 6 by threads, and a static seal is achieved at the thread by a sealing ring 20. The outer periphery of the support tube 6 can be matched with the inner wall of the rear flange cylinder of the rear flange 13, and the support tube 6 can slide relative to the rear flange cylinder. The first end of the support tube 6 can be the end of the support tube 6 close to the igniter 14. Before the front flange 1 and the rear flange 13 are unlocked, the second end of the support tube 6 can have a structural connection relationship with the front flange 1.

[0046] The first connecting portion of the connector 10 is provided with a communication hole on the side facing away from the igniter 14. This communication hole is located outside the combustion chamber 11. Therefore, the gas in the combustion chamber 11 can pass through this communication hole and enter the space to the left of the piston disc 9, that is, into the inner cavity of the support tube 6. Therefore, when the pressure in the support tube 6 increases, the piston disc 9 is driven by the pressure to move toward the igniter 14, thereby driving the support tube 6 away from the front flange 1.

[0047] The front flange 1 may include a front flange end and a front flange barrel. The front flange end may be mounted on a pyrotechnic system. Before the front flange 1 and rear flange 13 are unlocked, the front flange barrel may cross-overlap and dock with the support tube 6. During the unlocking process, the support tube 6 may be driven away from the front flange 1, thereby gradually reducing the area of ​​overlap between the front flange barrel and the support tube 6, ultimately releasing the structural connection between the front flange 1 and rear flange 13.

[0048] In some embodiments provided herein, the gap-retention pyrotechnic release mechanism may further include a shear pin 7. When unlocked, the shear pin 7 can penetrate the sidewall of the rear flange 13 and threadedly connect to the support tube 6. The shear pin 7 is positioned in its initial position. To initiate unlocking, the igniter 14 delivers high-pressure gas, which acts on the piston plate 9, which drives the support tube 6 to shear the shear pin 7.

[0049] In some embodiments provided herein, the gap-retaining pyrotechnic release mechanism may further include a wire retaining ring 8, which fits within an annular groove at the end of the support tube 6. The outer diameter of the wire retaining ring 8 in its free state may be larger than the outer diameter of the support tube 6. A stepped circle is provided on the inner side of the rear flange 13 near the igniter 14 end. When the support tube 6 moves to the igniter 14 end, the wire retaining ring 8, due to its own elasticity, expands outward and falls into the stepped circle of the rear flange 13, preventing the support tube 6 from moving in the opposite direction and ensuring that there is no excess material in the release gap.

[0050] In some embodiments provided herein, the gap-retention pyrotechnic release and unlocking device may further include a buffer member 12, which is fixed to the inner side of the combustion chamber 11 near the igniter 14. When the piston disc 9 moves toward the igniter 14 until it contacts the buffer member 12, the buffer member 12 deforms and absorbs the kinetic energy of the piston disc 9, significantly reducing the impact energy generated by the structural impact.

[0051] The above solution can realize the first-level pyrotechnic separation. The following describes the embodiment of the second-level pyrotechnic separation provided by the embodiment of the present application.

[0052] In some embodiments provided in the present application, the gap-maintaining pyrotechnic separation unlocking device may further include a connecting tube 15. The connecting tube 15 is arranged in the inner cavity of the support tube 6. The middle portion of the support tube 6 has an inwardly protruding annular support tube protrusion, and the end of the connecting tube 15 close to the igniter 14 has an outwardly protruding annular connecting tube protrusion. The outer diameter of the connecting tube protrusion is larger than the inner diameter of the support tube protrusion. On the side of the support tube protrusion close to the igniter 14, the inner wall of the support tube 6 and the outer peripheral clearance of the connecting tube protrusion are matched, and the dynamic seal between the support tube 6 and the connecting tube 15 is achieved by the O-ring 17. On the side of the connecting tube protrusion facing away from the igniter 14, the outer wall of the connecting tube 15 and the inner wall of the support tube protrusion are matched. During the unlocking process, when the support tube 6 moves toward the igniter 14 driven by the piston disk 9, the support tube protrusion can slide on the connecting tube 15 until the support tube protrusion contacts the connecting tube protrusion. Thereafter, the connecting pipe 15 can be moved away from the front flange 1 driven by the supporting pipe 6 .

[0053] The inner wall of the connecting tube 15 forms a clearance fit with the outer periphery of the second connecting portion of the connecting base 10, allowing the connecting tube 15 to slide relative to the connecting base 10, with a dynamic seal achieved via the O-ring 18. In the unlocked initial state, to allow the gas to directly act on the piston disc 9, the connecting tube 15 and the piston disc 9 can be spaced apart, and the outer periphery of the combustion chamber 11 facing away from the igniter 14 can be chamfered to facilitate gas flow into the cavity of the support tube 6 and act on the piston disc 9.

[0054] The connecting tube 15 can slide relative to the combustion chamber 11. In some embodiments, the connecting tube 15 has a central through hole at the end near the igniter 14. The inner diameter of the central through hole can be smaller than the outer diameter of the second connecting portion of the connecting base 10. On the one hand, it is used to limit the position of the connecting base 10, and on the other hand, it can cooperate with the outer wall of the combustion chamber 11.

[0055] In some embodiments provided in the present application, the gap-maintaining pyrotechnic separation and unlocking device may further include a front bearing cylinder 2 , a one-way snap ring 3 , a two-way snap ring 4 , a rear bearing cylinder 5 , and a positioning ring 16 .

[0056] The front support tube 2 is threadedly connected to the front flange portion of the front flange 1. The rear support tube 5 is threadedly connected to the rear flange portion of the rear flange 13. When unlocked, the two-way snap ring 4 is placed on the support tube 6 and sandwiched between the front and rear support tubes 2 and 5. The two-way snap ring 4 serves as a load-bearing member supporting the front and rear support tubes 2 and 5. One side of the front support tube 2 rests on the inclined surface of the two-way snap ring 4, while the other side abuts against the inclined surface of the one-way snap ring 3. The one-way snap ring 3 also fits on the support tube 6.

[0057] The locating ring 16 is threadedly connected to the connecting tube 15, simultaneously pressing the one-way snap ring 3 axially against the front bearing cylinder 2, thereby pre-tightening the one-way snap ring 3, the two-way snap ring 4, the front bearing cylinder 2, and the rear bearing cylinder 5. When not in operation, the threaded pair of the pre-tightening connecting tube 15 and the locating ring 16 can apply axial pre-tightening force to the front bearing cylinder 2, the one-way snap ring 3, the two-way snap ring 4, and the rear bearing cylinder 5.

[0058] As shown in Figures 2 and 3, the one-way snap ring 3 and the two-way snap ring 4 are open circular ring structures. The free outer diameters of the one-way snap ring 3 and the two-way snap ring 4 are both smaller than the inner diameters of the front support tube 2 and the rear support tube 5. During installation, they need to be expanded and inserted into the support tube 6. After being installed on the support tube 6, the outer diameters of the one-way snap ring 3 and the two-way snap ring 4 are both larger than the front support tube 2 and the inner diameters of the rear support tube 5. As the support tube 6 moves toward the igniter 14, it gradually moves into the inner cavity of the rear support tube 5, and thus the support tube 6 no longer provides support for the one-way snap ring 3 and the two-way snap ring 4. After losing support, the support tube 6 can retract due to its own elastic force. After retraction, the outer diameters of the one-way snap ring 3 and the two-way snap ring 4 are both smaller than the inner diameters of the front support tube 2 and the rear support tube 5. Therefore, during retraction, they do not interfere with the front support tube 2, achieving impulse-free clearance separation.

[0059] As shown in Figure 4, during operation, the igniter 14 outputs high-pressure gas, which acts on the piston disc 9. The piston disc 9 drives the support tube 6 to shear the shear pin 7, then move along the inner wall of the rear flange 13 toward the igniter 14. As the support tube 6 moves, the one-way snap ring 3 and the two-way snap ring 4 successively lose radial support and retract under the action of elastic force, releasing the initial lock between the front flange 1 and the rear flange 13. After both the one-way snap ring 3 and the two-way snap ring 4 have retracted, or while the two-way snap ring 4 is retracting, the support tube protrusion on the inner wall of the support tube 6 contacts the connecting tube protrusion of the connecting tube 15.

[0060] As shown in Figure 5, after the protrusion of support tube 6 contacts the protrusion of connecting tube 15, positioning ring 16 can be partially located within support tube 6. Support tube 6 can drive connecting tube 15 and positioning ring 16 toward igniter 14. Simultaneously, the outer step of positioning ring 16 pulls one-way snap ring 3 and two-way snap ring 4 into the interior of rear flange 13. Because the outer diameters of one-way snap ring 3 and two-way snap ring 4 are smaller than the inner diameters of front and rear support tubes 5, they do not interfere with front support tube 2 during retraction, achieving zero-impact clearance separation.

[0061] Before the initial unlocking, the gas enters the inner cavity of the support tube 6 through the connecting hole on the connecting seat, and the effective action area of ​​the gas is equal to the annular area composed of the inner diameter of the support tube 6 and the inner diameter of the piston disk 9. After the initial unlocking (after the state of Figure 4), the gas enters the inner cavity of the connecting tube 15 through the connecting hole on the connecting seat, and the effective action area of ​​the gas is the annular area composed of the inner diameter of the connecting tube 15 and the inner diameter of the piston disk 9. This area is much smaller than the gas action area during the initial unlocking process, reducing the kinetic energy generated during the retraction of the component. In addition, the inner diameter of the central through hole of the connecting tube 15 is slightly larger than the outer diameter of the combustion chamber 11, and the gap between the central through hole and the combustion chamber 11 can be used to circulate gas, and the gas can still exert a force on the piston disk 9 to push the piston disk 9 toward the igniter 14. In addition, the gap here can reduce the gas flow rate and further control the gas driving force during retraction.

[0062] The entire structure consisting of the piston disc 9, support tube 6, connecting tube 15, positioning ring 16, one-way snap ring 3, and two-way snap ring 4 moves toward the igniter 14 until the piston disc 9 contacts the buffer 12. The buffer 12 deforms and absorbs the kinetic energy of the former, greatly reducing the impact energy generated by the structural collision.

[0063] A step circle is provided on the inner side of the rear flange 13 near the end of the igniter 14. When the support tube 6 moves to the end of the igniter 14, the wire retaining ring 8 expands outward under its own elastic action and falls into the step circle of the rear flange 13, so that the support tube 6 cannot be displaced in the reverse direction, so that the whole composed of the piston disc 9, support tube 6, connecting tube 15, positioning ring 16, one-way snap ring 3, and two-way snap ring 4 is completely covered in the cavity composed of the rear flange 13 and the rear bearing cylinder 5, ensuring that there is no excess material in the separation gap.

[0064] In some embodiments provided in this application, the front flange 1 and the rear flange 13 are made of aviation aluminum, and the remaining load-bearing structural parts can be made of steel or high-strength titanium alloy. The final mechanism size obtained in a certain application example is Φ52*106 (excluding flange, unit: mm), and the total weight is less than 800g.

[0065] Although the present application is disclosed above with reference to the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A gap-maintaining pyrotechnic separation and unlocking device, characterized in that, It comprises a front flange (1), a support tube (6), a piston disc (9), a connecting seat (10), a combustion chamber (11), a rear flange (13), and an igniter (14); the front flange (1) and the rear flange (13) are used to be installed on two parts to be separated of a pyrotechnic system; The rear flange (13) comprises a rear flange end and a rear flange barrel, and the rear flange end is used for being mounted on the pyrotechnic system; The combustion chamber (11) is fixedly connected to the end of the rear flange and is installed in the cylinder of the rear flange; the first end of the combustion chamber (11) is used to install the igniter (14), and the igniter (14) is used to fill the cavity of the combustion chamber (11) with fuel gas; the second end of the combustion chamber (11) is provided with the connecting seat (10); the outer wall of the cavity of the combustion chamber (11) is provided with an annular piston disk (9), and the piston disk (9) can slide relative to the combustion chamber (11); The connecting seat (10) comprises a first connecting part, which is in a cylindrical shape and fixedly connected to the combustion chamber (11), and the inner cavity of the first connecting part is connected to the inner cavity of the combustion chamber (11); the first connecting part is provided with a connecting hole on the side away from the igniter (14), and the connecting hole is located outside the combustion chamber (11), and the cavity of the combustion chamber (11) is connected to the space on the left side of the piston disc (9) through the connecting hole; The outer wall of the piston plate (9) is threadedly fixedly connected to the first end of the support tube (6), the outer periphery of the support tube (6) is matched with the inner wall of the rear flange cylinder, and the support tube (6) can slide relative to the rear flange cylinder; The front flange (1) comprises a front flange end and a front flange barrel; the front flange end is used to be installed on a pyrotechnic system; before the front flange (1) and the rear flange (13) are unlocked, the front flange barrel and the support pipe (6) are cross-overlapped and butted.

2. The device according to claim 1, characterized in that, When in operation, the igniter (14) outputs high-pressure gas, which acts on the piston plate (9), and the piston plate (9) drives the support tube (6) to move along the inner wall of the rear flange (13) toward the igniter (14).

3. The device according to claim 1 or 2, characterized in that, The device also includes: A connecting tube (15) is arranged in the inner cavity of the support tube (6); the middle part of the support tube (6) has an inwardly protruding annular supporting tube protrusion, and the connecting tube (15) has an outwardly protruding annular connecting tube protrusion on the side of the supporting tube protrusion close to the igniter (14), and the outer diameter of the connecting tube protrusion is greater than the inner diameter of the supporting tube protrusion; on the side of the supporting tube protrusion close to the igniter (14), the inner wall of the supporting tube (6) and the outer peripheral clearance of the connecting tube protrusion are matched; on the side of the connecting tube protrusion away from the igniter (14), the outer wall of the connecting tube (15) and the inner wall of the supporting tube protrusion are matched.

4. The device according to claim 3, characterized in that During the unlocking process, when the support tube (6) moves towards the igniter (14), the support tube protrusion slides on the connecting tube (15) until the support tube protrusion contacts the connecting tube protrusion; then the connecting tube (15) is driven by the support tube (6) to move along the outer wall of the combustion chamber (11) in a direction away from the front flange (1).

5. The device according to claim 3 or 4, characterized in that, The connecting seat (10) further includes a second connecting portion, and the second connecting portion is located outside the combustion chamber (11); There is a clearance fit between the inner wall of the connecting tube (15) and the outer periphery of the second connecting portion, and the connecting tube (15) can slide relative to the connecting seat (10).

6. The device according to claim 5, characterized in that, The connecting tube (15) has a central through hole at the end close to the igniter (14), and the inner diameter of the central through hole is smaller than the outer diameter of the second connecting portion and larger than the outer diameter of the combustion chamber (11).

7. The device according to any one of claims 3 to 6, characterized in that In the unlocked state, the connecting tube (15) and the piston disc (9) are spaced apart.

8. The device according to any one of claims 3 to 7, characterized in that The device further includes a front bearing cylinder (2), a bi-directional snap ring (4), and a rear bearing cylinder (5); The front bearing cylinder (2) is fixed to the front flange cylinder portion, the rear bearing cylinder (5) is fixed to the rear flange cylinder portion. In the unlocked state, the bi-directional snap ring (4) is sleeved on the support tube (6), and is clamped between the front bearing cylinder (2) and the rear bearing cylinder (5); The free outer diameter of the bi-directional snap ring (4) is smaller than the inner diameter of the rear bearing cylinder (5); when the bi-directional snap ring (4) is installed on the support tube (6), the outer diameter of the bi-directional snap ring (4) is larger than the inner diameter of the front bearing cylinder (2) and also larger than the inner diameter of the rear bearing cylinder (5).

9. The device according to claim 8, characterized in that, As the support tube (6) moves towards the igniter (14), the support tube (6) gradually moves into the inner cavity of the rear bearing cylinder (5). After the bi-directional snap ring (4) disengages from the support tube (6), it retracts inward and moves along with the connecting tube (15).

10. The device according to claim 8 or 9, characterized in that The device further includes a positioning ring (16) and a one-way snap ring (3); the positioning ring (16) is fixedly connected to the connecting tube (15). In the unlocked state, the positioning ring (16) is located inside the inner cavity of the front bearing cylinder (2); the one-way snap ring (3) is sleeved on the support tube (6) and is clamped between the positioning ring (16) and the front bearing cylinder (2); The free outer diameter of the one-way snap ring (3) is smaller than the inner diameter of the front bearing cylinder (2) and also smaller than the inner diameter of the rear bearing cylinder (5); when the one-way snap ring (3) is installed on the support tube (6), the outer diameter of the one-way snap ring (3) is larger than the inner diameter of the front bearing cylinder (2).

11. The device according to claim 10, characterized in that, As the support tube (6) moves towards the igniter (14), the support tube (6) gradually moves out of the inner cavity of the front bearing cylinder (2). After the one-way snap ring (3) disengages from the support tube (6), it retracts inward and moves along with the positioning ring (16).

12. The device according to any one of claims 1 to 11, characterized in that, A chamfer is provided on the outer periphery of the side of the combustion chamber (11) facing away from the igniter (14).

13. The device according to any one of claims 1 to 12, characterized in that, The device further includes a shear pin (7); in the unlocked state, the shear pin (7) passes through the side wall of the rear flange (13) and is fixedly connected to the threaded hole of the support tube (6).

14. The device according to any one of claims 1 to 13, characterized in that, The device further includes a wire snap ring (8), the wire snap ring (8) is sleeved in the annular groove of the support tube (6), the annular groove is located at one end of the support tube (6) close to the igniter (14), and the outer diameter of the wire snap ring (8) in the free state is greater than the outer diameter of the support tube (6); a stepped circle is provided at one end of the inner side of the rear flange (13) close to the igniter (14) for accommodating the wire snap ring (8) that elastically expands outwards. When the wire snap ring (8) is located within the stepped circle, the inner diameter of the wire snap ring (8) is smaller than the outer diameter of the support tube (6).

15. The device according to any one of claims 1 to 14, characterized in that, The device further includes a buffer member (12), the buffer member (12) is fixed at a position inside the combustion chamber (11) close to the igniter (14) for buffering the energy after the impact with the piston disc (9).

16. A pyrotechnic system, characterized in that, The pyrotechnic system includes a clearance-maintaining pyrotechnic separation unlocking device as described in any one of claims 1 to 15.

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