阅读说明：本技术 一种适用于水下射弹的电磁开关气体集成阀 (Electromagnetic switch gas integrated valve suitable for underwater projectile ) 是由 黄磊 段磊 张孝石 彭雪明 何春涛 于 2020-06-18 设计创作，主要内容包括：本发明涉及一种适用于水下射弹的电磁开关气体集成阀,属于水下射弹技术领域,解决现有水下射弹的气源难以集成在弹体内的问题。适用于水下射弹的电磁开关气体集成阀包括：开关阀、充气阀、减压阀、气瓶和电磁铁；气瓶为回转体,充气阀设置在气瓶的一端,开关阀设置在气瓶的另一端；减压阀设置在开关阀的出气端；开关阀设有沿气瓶径向设置的活塞,活塞控制开关阀开启或关闭；电磁铁控制活塞沿气瓶的径向移动。本发明采用外置电磁铁时序控制,打开开关阀,小型化集成充气阀、气瓶、开关阀及减压阀,以实现射弹系统气体触发通气时刻及气体通气流量可控的目标。(The invention relates to an electromagnetic switch gas integrated valve suitable for an underwater projectile, belongs to the technical field of underwater projectiles, and solves the problem that a gas source of the existing underwater projectile is difficult to integrate in a projectile body. An electromagnetic switch gas integration valve for underwater projectiles comprising: the device comprises a switch valve, an inflation valve, a pressure reducing valve, a gas cylinder and an electromagnet; the gas cylinder is a revolving body, the charging valve is arranged at one end of the gas cylinder, and the switch valve is arranged at the other end of the gas cylinder; the pressure reducing valve is arranged at the air outlet end of the switch valve; the switch valve is provided with a piston arranged along the radial direction of the gas cylinder, and the piston controls the switch valve to be opened or closed; the electromagnet controls the piston to move along the radial direction of the gas cylinder. The invention adopts external electromagnet time sequence control, opens the switch valve, and integrates the inflation valve, the gas cylinder, the switch valve and the pressure reducing valve in a miniaturized way, so as to realize the purposes of controllable gas ventilation time and controllable gas ventilation flow of the projectile system.)

1. An electromagnetic switch gas integration valve adapted for use with an underwater projectile, comprising: the device comprises a switch valve (1), an inflation valve (2), a pressure reducing valve (3), a gas cylinder (4) and an electromagnet (5);

the gas bottle (4) is a revolving body, the inflation valve (2) is arranged at one end of the gas bottle (4), and the switch valve (1) is arranged at the other end of the gas bottle (4); the pressure reducing valve (3) is arranged at the air outlet end of the switch valve (1); the switch valve (1) is provided with a piston (6) which is arranged along the radial direction of the gas cylinder (4), and the piston (6) controls the switch valve (1) to be opened or closed; the electromagnet (5) controls the piston (6) to move along the radial direction of the gas cylinder (4).

2. The electromagnetic switch gas integration valve for underwater projectiles as claimed in claim 1 wherein said switch valve (1) is provided with a gas flow path communicating the interior of the gas cylinder (4) and the pressure reducing valve (3); the gas flow path is provided with a radial section (102);

the piston (6) is a rotary body and is provided with a first variable diameter part (109), and the first variable diameter part (109) can be inserted into and block the radial section (102);

the switch valve (1) is further provided with a reset structure, and the reset structure can enable the first diameter-changing portion (109) to be in a state of being inserted into the radial section (102).

3. The electromagnetic switch gas integration valve for underwater projectiles as claimed in claim 2, wherein said switch valve (1) is provided with a bush (106) and a bush mounting hole, said bush (106) being fully inserted into the bush mounting hole in a radial direction of the gas cylinder (4), said radial section (102) being provided at a bottom of the bush mounting hole;

the air flow passage is also provided with an air outlet section (107), and the air outlet section (107) penetrates through the side wall of the bushing mounting hole and is communicated with the radial section (102);

the piston (6) is provided with a second variable-diameter part (110), the second variable-diameter part (110) is installed in the lining (106), and the second variable-diameter part (110) can move in the radial direction of the gas cylinder (4) in the lining (106).

4. Electromagnetic switch gas integration valve suitable for underwater projectiles, according to claim 3, characterized by the fact that said return structure is a switch spring (103) in compression, said switch spring (103) bearing on the bush (106) at one end and on the second diameter variation (110) at the other end.

5. The electromagnetic switch gas integration valve for underwater projectiles of claim 4, wherein the side wall of the second variable diameter portion (110) is provided with a locking hole along the radial direction of the piston (6);

the bushing (106) is provided with a locking pin (104), the locking pin (104) being insertable into the locking hole by a locking spring (105);

when the first diameter-changing portion (109) is completely disengaged from the radial section (102), the locking pin (104) is inserted into the locking hole.

6. Electromagnetic switch gas integration valve suitable for underwater projectiles, according to claim 5, characterized by the fact that said bushing (106) is provided with a slide along the radial direction of the gas cylinder (4), said second variable diameter portion (110) of the piston (6) being provided with a sliding portion able to slide inside the slide.

7. The electromagnetic switch gas integration valve for underwater projectiles of claim 6, wherein the first variable diameter portion (109) is provided with a first sealing ring capable of sealing between the first variable diameter portion (109) and the radial segment (102);

the second variable-diameter portion (110) is provided with a second sealing ring, and the second sealing ring can seal between the second variable-diameter portion (110) and the bushing (106).

8. Electromagnetic switch gas integration valve for underwater projectiles according to claims 1 to 7 characterized by the fact that the inflation valve (2) is a one-way valve (202).

9. Electromagnetic switch gas integration valve suitable for underwater projectiles, according to claim 1, characterized by the fact that the gas cylinder (4) is made of carbon fiber material, able to withstand a maximum gas pressure of 15 MPa.

10. Electromagnetic switch gas integration valve adapted for underwater projectiles as in claim 1 characterized by the pressure reducing valve (3) capable of adjusting the gas flow rate of the output.

Technical Field

The invention relates to the technical field of underwater projectiles, in particular to an electromagnetic switch gas integrated valve suitable for an underwater projectile.

Background

The underwater projectile obtains high initial speed by utilizing a gun shooting technology, adopts a gas wrapping technology to reduce resistance, and then realizes underwater high-speed navigation so as to strike and intercept an underwater movement device. Therefore, the underwater projectile needs to be provided with a gas source and a gas control device. However, due to the small diameter of underwater projectiles, typically less than 35mm, it is difficult to arrange gas sources and devices inside the projectile.

The projectile launching mode generally adopts an adapter constrained launching mode, namely the adapter and the projectile limit the axial position through a positioning pin, and simultaneously, the gap between the outer surface of the projectile and the inner surface of a barrel is compensated, so that the functions of guiding, limiting and reducing friction resistance in the projectile launching process are achieved, and the adapter automatically separates under the action of fluid resistance after the projectile exits the barrel.

For an underwater projectile system, a certain time is needed for gas to enter and reach stable flow, and the gas flow has great influence on the resistance reduction characteristic of a projectile body, so that a gas source and a gas control device in the projectile can control the gas triggering and ventilation time and the gas ventilation flow, and no device can meet the technical requirements at present.

Disclosure of Invention

In view of the above analysis, the present invention aims to provide a gas integration valve with an electromagnetic switch suitable for underwater projectiles, so as to solve the problem that the gas source of the existing underwater projectiles is difficult to integrate in the projectile body.

The purpose of the invention is mainly realized by the following technical scheme:

in the technical scheme of the invention, the electromagnetic switch gas integrated valve suitable for the underwater projectile comprises: the device comprises a switch valve, an inflation valve, a pressure reducing valve, a gas cylinder and an electromagnet;

the gas cylinder is a revolving body, the charging valve is arranged at one end of the gas cylinder, and the switch valve is arranged at the other end of the gas cylinder; the pressure reducing valve is arranged at the air outlet end of the switch valve; the switch valve is provided with a piston arranged along the radial direction of the gas cylinder, and the piston controls the switch valve to be opened or closed; the electromagnet controls the piston to move along the radial direction of the gas cylinder.

In the technical scheme of the invention, the switch valve is provided with an airflow passage which is communicated with the interior of the gas cylinder and the pressure reducing valve; the airflow passage is provided with a radial section;

the piston is a revolving body and is provided with a first diameter-changing part, and the first diameter-changing part can be inserted into and block the radial section;

the switch valve is also provided with a reset structure, and the reset structure can enable the first reducing part to be in a state of being inserted into the radial section.

According to the technical scheme, the switch valve is provided with a lining and a lining mounting hole, the lining is completely inserted into the lining mounting hole along the radial direction of the gas cylinder, and the radial section is arranged at the bottom of the lining mounting hole;

the air flow passage is also provided with an air outlet section, and the air outlet section penetrates through the side wall of the bushing mounting hole and is communicated with the radial section;

the piston is provided with a second reducing part, the second reducing part is installed in the bushing, and the second reducing part can move in the bushing along the radial direction of the gas cylinder.

In the technical scheme of the invention, the reset structure is a switch spring in a compressed state, one end of the switch spring is abutted against the bushing, and the other end of the switch spring is abutted against the second diameter-changing part.

In the technical scheme of the invention, the side wall of the second variable diameter part is provided with a locking hole along the radial direction of the piston;

the bush is provided with a locking pin which can be inserted into the locking hole through a locking spring;

when the first diameter-changing portion is completely disengaged from the radial section, the locking pin is inserted into the locking hole.

According to the technical scheme, the bushing is provided with a sliding groove along the radial direction of the gas cylinder, and the second diameter-changing part of the piston is provided with a sliding part capable of sliding in the sliding groove;

in the technical scheme of the invention, the first diameter-changing part is provided with a first sealing ring, and the first sealing ring can seal the first diameter-changing part and the radial section;

the second reducing portion is provided with a second sealing ring, and the second sealing ring can seal the second reducing portion and the bushing.

In the technical scheme of the invention, the inflation valve is a one-way valve.

In the technical scheme of the invention, the gas cylinder is made of carbon fiber materials, and the maximum pressure capable of bearing the gas cylinder is 15 MPa.

In the technical scheme of the invention, the pressure reducing valve can adjust the output gas flow.

The technical scheme of the invention can at least realize one of the following effects:

1. the invention adopts external electromagnet time sequence control, opens the switch valve, and integrates the inflation valve, the gas cylinder, the switch valve and the pressure reducing valve in a miniaturized way, so as to realize the purposes of controllable gas ventilation time and controllable gas ventilation flow of the projectile system.

2. The invention adopts the mode that the electromagnet controls the piston to open the switch valve, so that the switch valve can be opened at the moment of projectile body launching, and the gas integration valve can discharge the gas in the gas cylinder, thereby realizing the gas resistance reduction of the projectile body.

3. According to the invention, through the arrangement of the locking pin and the locking hole, the whole device can still keep gas output after being launched out along with the projectile body, so that gas resistance reduction can still be carried out after the projectile body is launched.

In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is a sectional view of a switching valve according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of an inflation valve in accordance with an embodiment of the present invention.

Reference numerals:

1-switching valve; 101-a base; 102-a radial segment; 103-a switch spring; 104-a locking pin; 105-a locking spring; 106-a bushing; 107-gas outlet section; 108-an air intake section; 109-a first diameter-changing portion; 110-a second variable diameter portion; 2-an inflation valve; 201-inflation connection; 202-a one-way valve; 3-a pressure reducing valve; 4-a gas cylinder; 5-an electromagnet; 6-piston.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.

The embodiment of the invention provides a battery switch gas integrated valve suitable for an underwater projectile, which is a mode of opening a switch valve 1 by external electromagnetic valve time sequence control and simultaneously miniaturizing an integrated inflation valve 2, a gas cylinder 4, the switch valve 1 and a pressure reducing valve 3 so as to realize the target of controllable gas triggering and ventilation time and gas ventilation flow of a projectile system.

Specifically, as shown in fig. 1 to 3, an electromagnetic switch gas integration valve for underwater projectiles includes: the device comprises a switch valve 1, an inflation valve 2, a pressure reducing valve 3, a gas cylinder 4 and an electromagnet 5; the gas bottle 4 is a revolving body, the charging valve 2 is arranged at one end of the gas bottle 4, and the switch valve 1 is arranged at the other end of the gas bottle 4; the pressure reducing valve 3 is arranged at the air outlet end of the switch valve 1; the switch valve 1 is provided with a piston 6 arranged along the radial direction of the gas cylinder 4, and the piston 6 controls the switch valve 1 to be opened or closed; the electromagnet 5 controls the piston 6 to move along the radial direction of the gas cylinder 4. When the bullet shooting device is used, the gas charging valve 2 is used for charging gas to enable high-pressure gas to be stored in the gas cylinder 4, at the moment, the piston 6 enables the switch valve 1 to be in a closed state, when a bullet is shot, the electromagnet 5 is started, the electromagnet controls the piston 6 to move, the switch valve 1 is enabled to be in an open state, the gas in the gas cylinder 4 flows to the pressure reducing valve 3 through the switch valve 1, the pressure reducing valve 3 is adjusted to be proper pressure, and therefore stable gas flow is formed and the gas resistance reduction of the bullet is achieved.

In the embodiment of the invention, the electromagnet 5 is arranged on an adapter for projectile launching or on a gun barrel for projectile launching, the existing product can be used, and the cable of the electromagnet 5 is led out from the barrel wall or the gun barrel pipeline. The electromagnet 5 functions to provide the force required for the movement of the piston 6.

The pressure reducing valve 3 is also a mature product, and the air inlet end of the pressure reducing valve 3 is connected with the air outlet section 107 of the switch valve 1 through threads and is sealed. The pressure reducing valve 3 is used for adjusting the gas outflow side pressure, so that the gas flow is adjusted, and the purpose of stable and controllable gas flow is achieved.

In order to cooperate with the control of the piston 6, in the embodiment of the invention, the switch valve 1 is provided with an air flow passage which is communicated with the interior of the air bottle 4 and the pressure reducing valve 3; the airflow passage comprises an air inlet section 108, a radial section 102 and an air outlet section 107 which are connected in sequence; the air inlet section 108 is in threaded connection with the air outlet section 107 of the air bottle 4 and is arranged in a sealing mode, and the air outlet section 107 is connected with the pressure reducing valve 3. The piston 6 is a rotary body, the axis of the piston 6 is arranged along the radial direction of the gas cylinder 4, the piston 6 is provided with a first variable diameter portion 109, the first variable diameter portion 109 can be inserted into and block the radial section 102, when the first variable diameter portion 109 is inserted into the radial section 102, the gas flow passage is blocked, the switch valve 1 is in a closed state, when the first variable diameter portion 109 is separated from the radial section 102, the gas flow passage is unblocked, and the switch valve 1 is in an open state.

The switch valve 1 is further provided with a reset structure, the reset structure can enable the first diameter-changing part 109 to be in a state of being inserted into the radial section 102, namely the switch valve 1 is closed when the switch valve is not started, when the projectile body is launched, the electromagnet 5 is started to attract the piston 6, and the first diameter-changing part 109 is separated from the radial section 102 under the action of the reset structure.

In the embodiment of the present invention, the switch valve 1 is provided with the sleeve 106 and the sleeve mounting hole, the sleeve 106 is completely inserted into the sleeve mounting hole in the radial direction of the gas cylinder 4, the radial section 102 is provided at the bottom of the sleeve mounting hole, the sleeve 106 is used as a movement restricting structure, specifically, the piston 6 is provided with the second diameter changing portion 110, the second diameter changing portion 110 is mounted in the sleeve 106, and the second diameter changing portion 110 can move in the radial direction of the gas cylinder 4 in the sleeve 106. In addition, to ensure the air flow passage is unobstructed, the air outlet section 107 passes through the sidewall of the bushing mounting hole and communicates with the radial section 102.

In order to simplify the whole device, in the embodiment of the present invention, the reset structure is the switch spring 103 in a compressed state, one end of the switch spring 103 abuts against the bushing 106, and the other end abuts against the second diameter-changing portion 110, and when the electromagnet 5 is not operated, the switch spring 103 pushes the first diameter-changing portion 109 of the piston 6 into the radial section 102.

Because the device is arranged in the projectile body, when the projectile body is separated from the launching device, the electromagnet 5 cannot be launched along with the projectile body, the embodiment of the invention is provided with a locking structure to enable the switch valve 1 to be in an open state, specifically, the locking structure comprises a locking hole and a locking pin 104, and the side wall of the second diameter-changing part 110 is provided with the locking hole along the radial direction of the piston 6; the bush 106 is provided with a locking pin 104, the locking pin 104 being insertable into the locking hole by a locking spring 105; when the electromagnet 5 is activated, the piston 6 moves under the action of magnetic force, the first diameter-variable portion 109 is withdrawn from the radial section 102, and when the two are completely disengaged, the locking pin 104 is inserted into the locking hole, and at this time, even if the electromagnet 5 no longer applies force to the piston 6, the piston 6 is locked at the current position, and the air flow path is in an open state.

It should be noted that, considering that the underwater projectile has a large overload acceleration and deceleration process during launching and underwater navigation, the single locking structure is likely to disengage the locking pin 104 from the locking hole due to the inertia force, so that the piston 6 is under the action of the switch spring 103, and the first diameter-changing part 109 is inserted into the radial section 102 again, blocking the airflow passage, so that airflow resistance reduction cannot be performed any more.

In order to prevent the above situation, the locking structure is provided with at least 2 groups and arranged at different positions along the circumferential direction of the piston 6, preferably, the locking mechanism is provided with 2 groups and arranged between the piston 6 and the bush 106 respectively in the front and back directions along the axial direction of the gas cylinder 4, so as to ensure that the piston 6 is not unlocked, and the device of the invention can still continuously and stably output gas after the projectile body is launched, so as to perform gas resistance reduction.

Since the piston 6 is a rotary body, in order to prevent the locking structure from failing due to circumferential misalignment between the locking hole and the locking pin 104 caused by rotation of the piston 6, in the embodiment of the present invention, the bushing 106 is provided with a sliding groove along the radial direction of the gas cylinder 4, and the second diameter-changing portion 110 of the piston 6 is provided with a sliding portion capable of sliding in the sliding groove.

In view of the use of the apparatus of the present invention for launching underwater projectiles, it is desirable to prevent the ingress of liquids and, in addition, to prevent the escape of gases from other locations. In the embodiment of the present invention, the first diameter-changing portion 109 is provided with a first sealing ring, and the first sealing ring can seal between the first diameter-changing portion 109 and the radial section 102; the second variable diameter portion 110 is provided with a second seal ring that can seal between the second variable diameter portion 110 and the bushing 106.

In addition, the switch valve 1 is also provided with a base 101, the base 101 of the switch valve 1 is of a revolving body structure, one end of the base 101 of the switch valve 1 is connected with the gas cylinder 4 in a sealing mode through threads, the other end of the base 101 of the switch valve 1 is connected with the pressure reducing valve 3 in a sealing mode through threads, and an air outlet pipeline is designed on the base 101 of the switch valve 1. The bush 106 is fixed to the base 101 of the on-off valve 1 by screws or by adhesion. The base 101, the piston 6, the positioning pin and the bush 106 of the on-off valve 1 are made of an aluminum alloy material, preferably a magnesium alloy material, to reduce the weight, and the on-off spring 103 and the lock spring 105 are made of a spring steel material.

In the embodiment of the invention, the inflation valve 2 is composed of an inflation connector 201 and a one-way valve 202, and the inflation connector 201 and the one-way valve 202 are made of aluminum alloy materials, preferably magnesium alloy materials, so as to reduce the weight. The charging connector 201 is connected with the one-way valve 202 in a sealing mode through threads, and one end of the charging connector 201 is connected with one end of the gas bottle 4 in a sealing mode through threads. In the inflation process, the connector of the inflation valve 2 is connected with the inflation pipeline, the one-way valve 202 is used for realizing one-way flow of gas, when the pressure of the interface side of the inflation valve 2 is greater than the pressure of the gas cylinder 4 side, the one-way valve 202 is in an open state, and when the pressure of the interface side of the inflation valve 2 is less than the pressure of the gas cylinder 4 side, the one-way valve 202 is in a closed state.

It should be noted that the gas cylinder 4 is of a revolving structure, and the size of the gas cylinder 4 can be adjusted according to the gas quality requirement. The gas cylinder 4 is made of stainless steel materials, and the preferable gas cylinder 4 is made of carbon fiber composite materials so as to reduce weight. One end of the gas cylinder 4 is hermetically connected with the charging valve 2 through threads, and the other end of the gas cylinder is hermetically connected with the switch valve 1 through threads. The gas bottle 4 is used for storing high-pressure gas, and the maximum pressure of the stored gas is 15 MPa.

In using embodiments of the present invention:

firstly, gas cylinder 4 is inflated, the connector 2 of the inflation valve is connected with the inflation pipeline and then starts to inflate gas cylinder 4, the side pressure of the connector 2 of the inflation valve is larger than the side pressure of the gas cylinder 4 at the moment, the one-way valve 202 is in an opening state, the inflation is stopped after the pressure in the gas cylinder 4 reaches the set pressure, the gas pressure in the inflation pipeline is removed, the side pressure of the gas cylinder 4 is larger than the side pressure of the connector 2 of the inflation valve at the moment, and the one-way valve 202 is in a closing state.

Before underwater launching, the electromagnet 5 is not electrified in the initial state, and the switch spring 103 and the locking spring 105 are both in a compressed state; under the action of the switch spring 103, the first diameter-changing part 109 is inserted into the radial section 102, and the first sealing ring seals between the first diameter-changing part 109 and the radial section 102, so that the air flow passage is sealed; the locking pin 104 is completely confined inside the bush 106 under the constraint of the locking spring 105 and the wall surface of the piston 6 and the locking pin 104 is subjected to pressure and abuts against the side wall of the second diameter-reduced portion 110, the on-off valve 1 being in the closed state.

When underwater launching is carried out, the electromagnet 5 is electrified to generate attraction acting force on the piston 6, the acting force is larger than the spring force of the switch spring 103, the piston 6 moves towards the direction of separating from the radial section 102, the first diameter-changing part 109 separates from the radial section 102, and an air flow passage is reserved; when the piston 6 moves further, when the locking hole of the piston 6 moves to the locking pin 104, the locking pin 104 is pushed into the locking hole under the action of the locking spring 105, so that the piston 6 is locked, and the air passage is completely opened.

When the switch valve 1 is opened, high-pressure gas in the gas cylinder 4 flows to the pressure reducing valve 3 through the gas flow passage, the gas flow pressure of the output of the pressure reducing valve 3 is stable, in addition, the pressure reducing valve 3 further has adjusting capacity, the pressure of an output end can be controlled, the flow of output gas is adjusted, gas can be stably output, the process of launching the projectile body and the process after the projectile body are launched is guaranteed, the effect of gas flow resistance reduction can be kept stable, and the projectile body advancing track can be conveniently judged.

In summary, the embodiment of the invention provides an electromagnetic switch gas integrated valve suitable for an underwater projectile, which adopts external electromagnet time sequence control to open a switch valve and miniaturize an integrated inflation valve, a gas cylinder, a switch valve and a pressure reducing valve so as to realize the target that the gas triggering and ventilation time and the gas ventilation flow of a projectile system are controllable; according to the invention, the switch valve 1 is opened when the electromagnet 5 is used for controlling the piston 6, so that the switch valve 1 can be opened at the moment of projectile body launching, and the gas in the gas cylinder 4 can be discharged by the gas integrated valve, thereby realizing gas resistance reduction of the projectile body; according to the invention, through the arrangement of the locking pin 104 and the locking hole, the whole device can still keep gas output after being launched out along with the projectile body, so that gas resistance reduction can still be carried out after the projectile body is launched.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.