JPH0374185A - Electromagnetic accelerator - Google Patents

Abstract

PURPOSE:To prevent leakage of plasma to the front of a flying body by fitting partially separated elastic, insulating and abrasion resistant loop members expandably/shrinkably onto the outer circumference of the flying body so that the loop member is applied tightly onto the inner face of cylindrical body. CONSTITUTION:Elastic, insulating and abrasion resistant loop members 17, 18, 19, separated at separating sections 16, are fitted onto a flying body 10. The loop members 17, 18, 19 are expanded or contracted according to the space 5 in a cylinder 6, then the gap between the flying body 10 and the space 5 in the cylinder 6 is sealed thus preventing leakage of plasma 12 to the front of the flying body 10. Elastic amorphous iron plate having high electric conductivity is punched into a cross type armature 20 which is then secured, as it is, to the rear end of the flying body 10 through a screw 21. Consequently, the branch sections 22 contact, with uniform force, with the inner wall of the flexible space 5 through the elasticity of the armature 20 when the flying body 10 is inserted into the space 5 in the cylinder 6.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to an electromagnetic accelerator.

[Conventional technology] The electromagnetic accelerator will be explained using FIGS. 7 to 10.

A pair of parallel rail electrodes 1.2 and insulating plates 3.4 are alternately combined to form a cylinder 6 having a cylindrical space 5 inside.

A circuit 9 having a switch 7 and a high voltage power supply 8 is constructed between the rail electrodes 1.2.

A flying object lO that is slidable along the inner surface of the cylinder 6 is provided,
At the rear end of the flying object 10, radial cuts are made in the disc-shaped member and the cut portion is bent into an octopus-like shape to attach the rail electrode 1.
．． An armature 11 made of copper or phosphor bronze that can conduct between the two is fixed using a screw.

Note that 12 is plasma generated inside the cylindrical body 6.

Turn on the switch 7 and connect the high voltage power supply 8 to the rail electrode 1.
．． When the flying object 10 is inserted into the space 5 of the cylinder 6 from one end using a pre-accelerator (not shown) using compressed gas or the like, the rail electrode 1.2 inside the cylinder B
is conducted by the armature 11 at the rear end of the flying object lO, and a current i flows through the armature 11.

Then, as the current i flows through the armature 11,
A magnetic field is generated in a direction perpendicular to the paper plane of FIG. 7, and at the same time a Lorentz quadrature is generated in the direction of the arrow in FIG.

Therefore, the flying object 10 is accelerated within the cylinder 6 by the Lorentz quad, and the flying object 10 flies out from the other end of the cylinder 6.

The flying object lO ejected from the cylinder B hits a target (not shown), and the high temperature and high pressure state generated at this time is used for experiments on various physical phenomena.

[Problems to be Solved by the Invention] However, the above conventional electromagnetic accelerator has the following problems.

That is, behind the flying object 10 inside the cylinder B, there is a high-voltage power supply bag W.
The armature 11
is melted and evaporated, and - plasma 12 is generated.

Since the plasma 12 has conductivity, the armature 11
A current i also flows through the plasma 12 near the armature 11, so the plasma 12 near the armature 11 receives the Lorentz quad and is accelerated together with the projectile lO.Moreover, since the plasma 12 is lighter than the projectile lO, a large acceleration can be obtained. Part of the plasma 12 leaks to the front of the flying object IO from between the object IO and the space 5 inside the cylinder 8.

Then, the current i is the plasma 12 emitted in front of the flying object 10.
As a result, only the plasma 12 emitted in front of the flying object IO is accelerated, and the flying object IO is no longer accelerated.

Therefore, conventionally, the fitting between the flying object 10 and the cylindrical body 6 has been tightened to prevent leakage of the plasma 12. Leakage to the front of the flying object 10 could not be completely prevented.

In view of the above-mentioned circumstances, it is an object of the present invention to provide an electromagnetic accelerator that can prevent plasma from leaking forward of a flying object.

[Means for Solving the Problems] The present invention provides a cylindrical body having a pair of rail electrodes in the internal longitudinal direction to which a high voltage current is applied, and a flying object that is inserted into the cylindrical body and can conduct between the rail electrodes. In an electromagnetic accelerator consisting of an electromagnetic accelerator, a loop-shaped member having elasticity, insulation, and abrasion resistance and having a partially divided part is attached to the outer periphery of the projectile so that it can be expanded and contracted so as to be in close contact with the inner surface of the cylinder. This relates to an electromagnetic accelerator characterized by being fitted.

[Function] A loop-shaped member fitted around the outer periphery of the projectile so as to be expandable and contractible,
Since a seal is formed between the inner surface of the cylinder and the inside surface of the cylinder, leakage of plasma to the front of the flying object is prevented.

[Example] Examples of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention.

The structure of the cylindrical body 6 is the same as that shown in FIGS. 7 and 8, so a description thereof will be omitted.

Circumferential grooves 13, 14, 15 are formed on the outer periphery of the flying object IO.

Each groove 13, 14, 15 has an open loop having elasticity, insulation, and abrasion resistance, and having a diameter slightly larger than the space 5 inside the cylinder B, which is partially separated by the dividing part 1B. Ring-shaped loop-shaped members 17, 18, and 19 are fitted on the outside of the dividing portion 16 so as to be expandable and contractible, respectively, with the phases shifted from each other.

The loop-shaped members 17, 18, and 19 may be made of the same material or different materials, but in the present invention, Teflon rings are used in which the insulating material is treated with Teflon to improve wear resistance.

A cross-shaped armature 20 made of iron amorphous, which has elasticity and high conductivity, is attached to the rear end of the flying object 1O by screw 2.
Fixed at 1.

The cross-shaped branch portions 22 of the armature 20 have flat tips, and between each branch portion 22 are formed rounded portions 23 whose curvature becomes gradually gentler from the root to the tip. The bending stress generated in the branch part 22 when bending is made small.

Next, the operation will be explained.

The acceleration of the flying object 1O is performed in the same manner as in FIGS. 7 to 1O.

At this time, the flying object 10 has a loop-shaped member 17. which has elasticity, insulation, and abrasion resistance, and is divided by the dividing portion 16.
18 and 19 are fitted on the outside, so that the loop-shaped member 17
．． 18 and 19 expand and contract according to the space 5 inside the cylinder 6,
A seal is formed between the flying object IO and the space 5 of the cylinder 6 to prevent plasma 12 from leaking to the front of the flying object 10.

At this time, the dividing portion 1 of each loop-shaped member 17, 18, 19
6 are out of phase with each other, so that the plasma 12 is prevented from leaking from the dividing portion 16.

This ensures that the current i flows through the armature 20, and the flying object IO is reliably accelerated.

The armature 20 is made by punching amorphous iron with high elasticity and high conductivity into a cross shape with a rounded part 23 between the branches 22, and attaches it to the rear end of the flying object IO using a screw 21. Since it is fixed, the flying object 1
0 into the space 5 inside the cylindrical body 6, the elasticity of the armature 20 causes the branch portion 22 to contact the inner wall of the flexure space 5 with equal force.

Therefore, as shown in FIG. 9 and FIG. 1O, compared to an octopus-like armature 11 made of copper or phosphor bronze that has almost no elasticity, the effort of making cuts and bending can be saved. Furthermore, there is no possibility that variations in the contact state of the armature 11 with the inner wall of the space 5 inside the cylinder B due to subtle differences in the degree of bending of the octopus leg portions improve the reliability of the acceleration performance of the flying object 10. be able to.

FIG. 4 shows another embodiment of the present invention, in which the groove 1 of the flying object IO
The pin 24 is implanted in the loop member 17 at the divided portion 1B.
This embodiment is the same as the embodiment described above, except that a notch 25 for sandwiching the bottle 24 is provided so that the phase of the dividing portion 16 is kept constant, and the same effects can be obtained.

FIG. 5 shows another embodiment of the present invention, in which a loop-shaped member 17
The structure is the same as each of the embodiments described above except that the cut end of the 16° dividing portion is made oblique, and the same effects can be obtained.

FIG. 6 shows still another embodiment of the present invention, in which a ring-shaped armature 2B is disposed between loop-shaped members 17.19 on the outer periphery of the flying object 10, and the plasma 12 is transferred to the loop-shaped members 17.1.
It has substantially the same structure as each of the above embodiments except that it is confined between 9 and 9, and the same effects can be obtained.

Note that the electromagnetic accelerator of the present invention is not limited to the above-described embodiments, and the cross-sectional shape of the cylindrical space and the loop-shaped member is not limited to circular, but may be rectangular, elliptical, or other shapes. Also, the number of loop-shaped members is 4 even if it is 1 or 2.
Of course, it is possible to use more than one, and various other changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the electromagnetic accelerator of the present invention,
A loop-shaped member having elasticity, insulation, and abrasion resistance and having a partially cut part is fitted around the outer circumference of the projectile to create a seal between the projectile and the cylindrical body, so that the plasma can fly. An excellent effect can be achieved in that it can prevent leakage to the front of the body and impede the acceleration of the flying object.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a flying object used in an embodiment of the present invention, FIG. 2 is a front view of the armature in FIG. 1, and FIG. 3 is a side sectional view showing the accelerated state of the flying object in FIG. 1. , FIG. 4 is a partial view of another embodiment of the present invention seen from the side, FIG. 5 is a partial view of another embodiment of the present invention seen from the side, and FIG. 6 is a partial view of another embodiment of the present invention seen from the side. 7 is a side sectional view showing the acceleration state of the flying object in the embodiment, FIG. 7 is an overall lateral sectional view of the conventional example, FIG. A side view of the flying object used in the figure, FIG. 1O is a rear perspective view of FIG. 9. In the figure, 1.2 is a rail electrode, 5 is a space, 6 is a cylinder, 8 is a high-voltage power supply, 1O is a flying object, 13, 14.15 is a groove, 1
B, 16° is the dividing part, 17.18. L9 indicates a loop-shaped member. Figure 9 Figure 10 Figure 1

Claims (1)

[Claims] 1) An electromagnetic accelerator comprising a cylinder having a pair of rail electrodes in the internal longitudinal direction to which a high-voltage current is applied, and a flying object inserted into the cylinder and capable of conducting between the rail electrodes, An electromagnetic accelerator characterized in that a loop-shaped member having elasticity, insulation, and abrasion resistance and having a partially divided part is fitted around the outer periphery of the projectile so that it can be expanded and contracted so as to be in close contact with the inner surface of the cylinder. .