JPH0632297A - Vacuum guide pipe for coil type electromagnetic launcher - Google Patents

Abstract

PURPOSE:To facilitate the shooting in/out of a launcher simultaneously with the vacuum seal of both end portions of a guide pipe to lessen air resistance following the travel of the coil type electromagnetic launcher. CONSTITUTION:A launcher 11 is arranged on the atmosphere side of a guide pipe 12, and thin film partitions 15 that the launcher 11 can break easily are provided in multi-steps respectively at shoot-in and shoot-out end portions 12a, 12b, and it is arranged that while the pressure differences of portions partitioned by means of respective film partitions 15 are being made small, insides come to fall into high vacuum PO states in order. As a result, the compatibility of the securing of the high vacuum state of the guide pipe 12 and the facilitation of the shoot-out of the launcher 11 is realized, and at the same time the connection of a cable 19 or the like on the shoot-in side can also be conducted easily on the atmosphere side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum guide pipe for reducing the air resistance accompanying the running of a coil type electromagnetic launcher in which a launcher such as a projectile coil is pulled forward and accelerated while sequentially exciting external coils. With regard to the above, it is possible to easily insert and eject the launcher at the same time as vacuum sealing of both ends.

[0002]

2. Description of the Related Art As space development progresses, the need to increase the launch weight of equipment into space has increased, and research and development of high-efficiency aircraft that can replace chemical rockets has been conducted. There is a formula electromagnetic launcher. This coil type electromagnetic launcher has a large number of external coils 2 installed at regular intervals along the outside of the guide pipe 1 as shown in FIG. The projectile coil 3 which is a flying body of the type is mounted, and the projectile coil 3 is accelerated at high speed and emitted by sequentially exciting from the external coils 2-1 to 2-n on the incident end side. There is. When such a rocket-type vehicle 3 is attempted to be accelerated at high speed, the air resistance in the guide pipe 1 increases in proportion to the square of the speed, so that the influence gradually increases and it is not possible to accelerate efficiently. Therefore, it is possible to reduce the air resistance by making the inside of the guide pipe 1 a vacuum state, and it is possible to use a vacuum guide pipe.

[0003]

Therefore, both ends of the guide pipe are closed with a sealing material such as a metal film, the internal pressure is maintained at 10 Torr or less, and the projectile coil is accelerated in the guide pipe. Although it is possible to reduce the air resistance, the outside of the guide pipe is at atmospheric pressure, and the thickness of the sealing material must be increased to secure the strength to hold the pressure difference between the inside and outside. . Therefore, at the emission end of the guide pipe, a large force is required when the projectile coil is jumped out of the guide pipe, and the projectile coil may be damaged when the seal material is broken and jumped out. In addition, when a superconducting coil is incorporated as a projectile coil or because a device installed in the projectile coil requires gas or electricity to be connected and cables are connected, the sealing material on the incident side of the guide pipe must be In some cases, it is necessary to start acceleration from the outside atmosphere side. In this case, the velocity is small at the entrance end, and the same problem as at the exit end occurs such that the thick sealant cannot be broken.

The present invention has been made in view of the above problems of the prior art. A coil type electromagnetic launcher which can reduce air resistance in a high vacuum state and can easily emit from a guide pipe of the launcher. It is intended to provide a vacuum guide pipe. Further, the present invention intends to provide a vacuum guide pipe of a coil type electromagnetic launcher which can reduce air resistance in a high vacuum state and can easily enter and exit the guide pipe of the launcher. It is a thing.

[0005]

In order to solve the above problems, the vacuum guide pipe of the coil type electromagnetic launcher of the present invention is a coil type in which the coils arranged along the outside of the guide pipe are sequentially excited to accelerate the launcher inside. In the guide pipe of the electromagnetic launcher, the launcher is installed inside by closing the incident end of the guide pipe, and the exit end is provided with a film partition wall that can be broken by the advance of this launcher and seals while maintaining the pressure difference between the front and rear. It is characterized in that it is provided in multiple stages, and the pressure of the portion partitioned by these film partition walls is maintained so that the inside of the guide pipe becomes a high vacuum. Further, in the vacuum guide pipe of the coil type electromagnetic launcher of the present invention, the launcher can be attached to the atmosphere side of the incident end of the guide pipe, and can be broken at the entrance and exit ends of the guide pipe by the advance of the launcher. Along with it, a film partition wall that seals while maintaining a pressure difference between the front and back is provided in multiple stages, and the pressure of the part partitioned by these film partition walls is maintained such that the inside of the guide pipe becomes a high vacuum. .

[0006]

According to the vacuum guide pipe of the coil type electromagnetic launcher, the launcher is closed by closing the entrance end of the guide pipe, and the launcher is easily broken at the exit end by providing a multi-stage thin film partition wall. The inside of the chamber is sequentially set to a high vacuum while reducing the pressure difference between the portions partitioned by the respective film partition walls, so that the high vacuum state is secured and the launcher is easily emitted. Further, according to the vacuum guide pipe of this coil type electromagnetic launcher, the launcher is arranged on the atmosphere side of the guide pipe,
At the entrance and exit ends, a thin film partition that can be easily broken by each launcher is provided in multiple stages, and the inside of each part is partitioned into a high vacuum while reducing the pressure difference between the parts partitioned by each film partition. While ensuring a vacuum state and facilitating launcher launching, it is possible to easily connect cables on the incident side to the atmosphere side.

[0007]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram according to an embodiment of a vacuum guide pipe of a coil type electromagnetic launcher of the present invention and a schematic configuration diagram of a launcher. The vacuum guide pipe 10 of this coil-type electromagnetic launcher includes a cylindrical guide pipe 12 in which a coil-type electromagnetic launcher (hereinafter, simply referred to as a launcher) 11 is accelerated and traveled. For example, its length is about 200 m. It This guide pipe 1
A large number of external coils 13-1 to 13-n are arranged on the outer side of the guide pipe 12 at regular intervals along the length direction of the guide pipe 12, and the incident end side of the guide pipe 12 is controlled by a power supply and a control device (not shown). The external coil 13-1 can be sequentially excited toward the external coil 13-n on the emitting end side.

A front incident end portion 12a is left from the incident end of the guide pipe 12 by about the mounting length of the launcher 11.
A plurality of flanges 14 are formed at regular intervals on the emitting end 12b, and film partition walls 15 for vacuum sealing are attached to the flanges 14, respectively, and are partitioned by the multi-layer film partition walls 15 in the front and rear thereof. It is designed to form multiple spaces. This film partition 15
A thin film made of plastic, metal, or the like is used as the film for vacuum sealing that constitutes the, and is provided with strength that can be easily broken by the launcher 11 and that can hold the differential pressure applied to the front and back of each film partition wall 15. To

In this way, the film partition wall 15 has a multi-staged end.
A vacuum pump 16 is connected to each space of the guide pipe 12 partitioned by, and a suction pipe 18 is connected in series from the central portion of the guide pipe 12 to both sides via a valve 17. Therefore, when the inside of the guide pipe 12 is brought to the vacuum state P1 by the vacuum pump 16, vacuum suction is started with all the valves 17 open, and the valves 17 are sequentially opened from the ones near the ends 12a, 12b of the guide pipe 12. By closing, each film partition wall 1 against the pressure outside the guide pipe 12, for example, the atmospheric pressure P0.
The pressure in the space partitioned by 5 is P2, ..., P7, and the pressure difference (P0 <P5 <P4 <P3 <P2 <P1, P0 <P7 <
By applying P6), it is possible to reduce the force applied to each of the film partition walls 15 and bring the intermediate majority of the guide pipe 12 to a predetermined high vacuum state P1, for example, 10 Torr or less.

In the vacuum guide pipe 10 of the coil type electromagnetic launcher thus constructed, the inside of the guide pipe 12 is vacuum-sucked by the vacuum pump 16, and the guide pipe 1
The pressure in the space partitioned by the film partition walls 15 is P2, ... P7 with respect to the atmospheric pressure P0 outside the second position, and the respective pressures are P0 <P5 <P4 <P3 <P2 <P1, P0 <P
Make sure that 7 <P6. And the guide pipe 12
The launcher 11 is attached to the atmospheric pressure P0 portion outside the incident end portion 12a of, and the cable 19 is connected if necessary.

After the preparation is completed, the launcher 1
1, the acceleration is started while switching the excitation of the external coil 13, and the cable 19 is disconnected at the same time when the acceleration is started. Then, the film partition walls 15 of the incident end 12a are broken at the tip of the launcher 11 one after another and enter the middle portion of the guide pipe 12 in the high vacuum state P1.

When the film partition wall 15 is broken by the launcher 11, the pressure becomes higher toward the outside, which may cause a pressure increase in the front. However, the gap between the guide pipe 12 and the launcher 11 is small and the gap is small. Since the flow resistance of the flowing air is large, the pressure increase in the space in front is slight, and the problem of vacuum break does not occur. Although the launcher 11 passes through each film partition wall 15 while breaking, the film partition walls 15 are designed to have a small pressure difference between the front and back sides, so a thin film is used, and the launcher 11 can easily pass through the launcher and There is no damage to 11. In this way, the launcher 1 is installed in the high-vacuum state P1 in the guide pipe 12 with a small air resistance.
1 is accelerated and, like the incident end 12a, the emission end 12
Guide pipe 1 at high speed by breaking each film partition wall 15b
It is emitted from 2 to the external space such as the atmospheric pressure P0. Therefore, the inside of the guide pipe 12 is set to a high vacuum state P1 to reduce the air resistance, and at the same time, the launcher 11 can easily enter the guide pipe 12 and exit from the guide pipe 12. Since it can be installed at the atmospheric pressure P0 portion, the cable 19 and the like can be easily connected.

Next, another embodiment of the present invention will be described.
The description will be made with reference to FIG. 2, but the same parts as those in FIG. In this embodiment, when the film partition wall 15 at the incident end 12a of the guide pipe 12 is broken by the launcher 11, the pressure rise in the front portion is prevented as much as possible.
The incident end of No. 2 is closed by the sealing material 20, and the cable 19 connected to the launcher 11 is led out of the guide pipe 12 via the sealing mechanism 21. The portion where the launcher 11 is located is also vacuum-sucked, and the pressure is adjusted by the vacuum pump 16 and the valve 17 so that the pressure becomes P5 '(P5'> P5).

In the vacuum guide pipe 10 of such a coil type electromagnetic launcher, when the launcher 11 is accelerated, the cable 19 is disconnected, and the film partition walls 15 of the incident end 12a are broken and accelerated to be in a high vacuum state P1.
The light passes through a portion having a small air resistance, breaks the film partition wall 15 of the emission end 12b, and is emitted to the external space. Therefore, at the incident end portion 12a, the incident end of the guide pipe 12 is blocked by the sealing material 20, so that even if the film partition wall 15 in front is broken, only a small amount of air is guided.
It is possible to accelerate the launcher 11 by not further passing through the gap between the launcher 11 and the pressure rise in the front portion as compared with the above-described embodiment and reducing the air resistance.

The structure of the launcher 11 is shown in FIG.
As shown in (b), the tip is a cone, the internal space is a payload, the rear is a cylinder, and a control system and a superconducting magnet or a permanent magnet are built in. Aluminum alloy or FRP outer shell
Made.

Further, in the above-mentioned embodiment, the multi-stage film partition wall is provided at the entrance end, but when the entrance end is closed with the sealing material, the film partition wall is omitted.
It suffices if the cable does not break the vacuum. Further, the number of stages of the multi-stage film partition may be appropriately determined depending on the difference between the degree of vacuum inside the guide pipe and the external pressure and the strength of the film used for the film partition, and it is possible to secure a sealed state and to easily break the launcher. Determine by balance. Further, the interval between the film partition walls can be arbitrarily selected, and is determined in terms of production and the total length of the guide pipe. Further, each constituent element may be modified within the scope of the invention.

[0017]

As described above in detail with the embodiments, according to the vacuum guide pipe of the coil type electromagnetic launcher of the present invention, the launcher is put inside by closing the incident end of the guide pipe and emitting end. A thin film partition that can be easily broken by the launcher is provided in multiple stages, and the inside of the guide pipe is continuously evacuated while reducing the differential pressure of the part partitioned by each film partition so that the inside of the guide pipe is highly evacuated. In this state, the air resistance can be reduced, and the launcher can be easily emitted due to the thin film partition wall. Further, according to the vacuum guide pipe of this coil type electromagnetic launcher, the launcher is arranged on the atmosphere side of the guide pipe, and the thin film partition walls at which the launcher can be easily broken are provided at the entrance and exit ends in multi-stages. The inside of the guide pipe is set to a high vacuum in sequence while reducing the differential pressure of the part partitioned by the partition wall, so that the inside of the guide pipe can be in a high vacuum state to reduce the air resistance, and the thin film partition wall enables the launcher. The emission of light can be facilitated, and a cable or the like on the incident side can be easily connected on the atmosphere side.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram and a schematic configuration diagram of a launcher according to an embodiment of a vacuum guide pipe of a coil type electromagnetic launcher of the present invention.

FIG. 2 is a schematic configuration diagram according to another embodiment of the vacuum guide pipe of the coil type electromagnetic launcher of the present invention.

FIG. 3 is a schematic configuration diagram of a guide pipe of a conventional coil type electromagnetic launcher.

[Explanation of symbols]

 10 Vacuum Guide Pipe of Coil Type Electromagnetic Launcher 11 Launcher 12 Guide Pipe 12a Entrance End 12b Emission End 13 External Coil 14 Flange 15 Film Partition 16 Vacuum Pump 17 Valve 18 Suction Pipe 19 Cable 20 Sealing Material 21 Sealing Mechanism P Pressure

Claims (2)

[Claims] 1. A guide pipe of a coil-type electromagnetic launcher that sequentially excites coils arranged along the outside of a guide pipe to accelerate an internal launcher, wherein the launcher is mounted inside by closing an incident end of the guide pipe. , Multi-stage film partitions that can be broken by the advance of this launcher and seal while maintaining the pressure difference between the front and back, and the pressure of the part partitioned by these film partitions is higher in vacuum inside the guide pipe. A vacuum guide pipe for a coil-type electromagnetic launcher, which is held so that 2. A guide pipe of a coil type electromagnetic launcher for accelerating an internal launcher by sequentially exciting coils arranged along the outside of the guide pipe, wherein the launcher is attached to the atmosphere side of an incident end of the guide pipe. , Multi-stage film partition walls that can be broken by the advance of this launcher and seal while maintaining the pressure difference between the front and back are provided at the input and output ends of this guide pipe, and the pressure of the part partitioned by these film partition walls is guided. A vacuum guide pipe for a coil-type electromagnetic launcher, characterized in that the inside of the pipe is maintained so as to have a high vacuum.