JPH02275296A - Projectile launcher using liquid propellant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a projectile launcher using liquid propellant.

(B) Prior Art As a conventional projectile launcher using liquid propellant, for example, Japanese Utility Model Application Publication No. 148091/1983;
There are those shown in Japanese Patent Application Laid-open No. 148092, Japanese Patent Application Laid-Open No. 63-34496, and the like. The projectile launcher using liquid propellant described in these publications includes a gun barrel capable of loading a projectile, a chamber formed inside the barrel, and a chamber for igniting the liquid propellant in the chamber. an igniter,
have. The ignition device ignites the liquid propellant in the chamber, and the resulting combustion gas pressure causes the projectile to be launched. The ignition device used is similar to a spark plug used in internal combustion engines.

(c) The problem to be solved by the invention, however, the arc produced by the spark plug is
Depending on the dimensions of the electrodes, how they are attached, etc., they occur, for example, at the part where the distance between the electrodes is the smallest, and moreover, they always occur at approximately the same location. Therefore, only the electrode surface where the arc occurs is significantly damaged. Furthermore, since the arc only occurs in one location, the contact area between the arc and the liquid propellant is very small, and the heat generated by the arc is not effectively transferred to the liquid propellant, resulting in effective ignition. The problem is that this is not done. For this reason, the reproducibility of the combustion state of the liquid propellant is poor and the firing speed varies. The present invention aims to solve such problems.

(d) Means for solving the problem The present invention embeds a permanent bar magnet in the electrode and rotates the arc using the magnetic field obtained by the stiffness.
Solve the above three problems. 1- That is, the projectile launcher using liquid propellant according to the present invention has a gun barrel (10) capable of loading a projectile, and a chamber (10) formed at the rear end side of the projectile of the gun barrel. 16), an electrical insulator (18) fixed to the rear end of the gun barrel and forming at least a part of the bottom wall of the chamber, and an electrode (22) that penetrates the electrical insulator and reaches into the chamber. , a permanent bar magnet (34) provided in the electrode
The f'Erui-shaped chamber, the cylindrical pole and the cylindrical permanent bar magnet are arranged concentrically, and correspond to the axial center position of the permanent bar magnet. A concentric raised part (22a) is provided on the outer diameter of the electrode, and at least the side wall of the chamber located on the outer periphery of the raised part is made of a conductive material, and the side wall of this chamber and An energizing device (26) capable of energizing is provided between the '4L pole and the energizing device (26).

(e) Working permanent bar magnets form magnetic lines of force around the electrodes. At the raised portion formed on the electrode, the lines of magnetic force are parallel to the electrode. When a voltage is applied between the electrode and the gun barrel in this state, an arc is generated between the protrusion of the electrode and the side wall of the chamber.

Since the arc crosses the magnetic field lines, the arc is subjected to a Lorentz force tangential to the electrode, causing it to rotate around the ridge of the electrode. Since the arc rotates around the raised part of the electrode at high speed, the situation is similar to that where the arc is generated all around the raised part, and the contact area between the arc and the liquid propellant is expanded, causing the generation of the arc. heat is effectively transferred to the liquid propellant. This stabilizes the ignition state of the liquid propellant,
The ignition condition is improved. This stabilizes the combustion state of the liquid propellant and reduces the variation in projectile velocity. Additionally, since the arc is generated uniformly around the ridges of the electrode, damage to the electrode is also reduced.

(f) Example An example is shown in FIG. The gun barrel 10 made of conductive material has a gun cavity 14 into which a projectile 12 can be loaded, and a chamber 16 at the rear end of the projectile 12. gun barrel 1
An electrical insulator 18 is attached with bolts 20 so as to close the rear end side of the 0. The cylindrical insert 18a of the electrical insulator 18 fits into the cylindrical portion of the chamber 16 and forms the bottom wall of the chamber 16. An electrode 22 is fixed to the center of the gas insulator 18 concentrically therewith. ' Wiring 28 of an energizing device 26 is connected to the outer end of the city pole 22 via a port 24 . Energizing device 26
The power supply 30 and switch 32 are connected, and the wiring 28
The other end is connected to the gun barrel 10. A permanent bar magnet 34 is embedded in a concentric hole provided inside the electric wire 8i22.

A concentric ring-shaped protuberance 22a is formed on the outer periphery of the electrode 22 corresponding to the axial center position of the permanent bar magnet 34.

Next, the operation of this embodiment will be explained.

First, fill the chamber 16 of the gun barrel 10 with liquid propellant 36.
Next, load the flying body 12 into the gun IF214. When the switch 32 of the energizing device 26 is turned on in this state, an arc 38 is generated between the raised portion 22a of the energizer 8!22 and the side wall of the chamber of the gun barrel 10. At a predetermined point in time, the arc 38 is generated between one location of the raised portion 22a and the chamber side wall of the gun barrel 10 located on the outer peripheral side of the raised portion 22a. This arc 38 crosses the lines of magnetic force generated by the permanent bar magnet 34. The raised portion 22a is a permanent bar magnet Ij34
Since it is arranged at the center position in the axial direction, the lines of magnetic force are in a P-line with the electrode 22 at the outer periphery of the raised portion 22a. Therefore, the arc 38 will be perpendicular to the lines of magnetic force, and therefore, the Lorentz force in the tangential direction of the electrode 22 will act on the arc 38. This force causes the arc 38 to rotate around the raised portion 22a at high speed. Follow”C1
If viewed within a certain period of time, the arc 38 is the bulge 22 of the electrode 22.
It exists in a disk shape around the outer periphery of a.

As a result, the contact area between the arc 38 and the liquid propellant 36 is significantly increased, and the heat of the arc 38 is efficiently transferred to the liquid propellant 36, so that the liquid propellant 36 is ignited. arc 3
Since the generation state of 8 is stable, the reproducibility of the ignition state when repeated firing is performed is very high, and the combustion state of the liquid propellant 36 is also highly reproducible. Follow”C1
Variations in the firing speed of the flying objects 12 are reduced.

Furthermore, since the arc 38 is generated over the entire outer periphery of the raised portion 22a, heat is not concentrated in one place on the electrode 22, and damage to the surface of the electrode 22 can be averaged out.
22 lifespan can be extended.

(G) Effects of the Invention - As explained above, according to the present invention, a permanent bar magnet is embedded in the electrode for igniting liquid propellant, and an arc rotating around the outer circumference of the 7ji pole is obtained. The ignition state of the liquid propellant becomes stable and the reproducibility of the firing rate becomes high.
In addition, wear and tear on the electrodes is reduced, resulting in a longer service life.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Gun barrel, 12... Projectile body, 16... Chamber, 18... Electrical insulator, 22... Electrode, 26...
... Current supply device, 34 ... Permanent bar magnet, 36 ... Liquid propellant, 38 ... Arc, 22a ... Protrusion. Patent applicant Toichi Steel Works Co., Ltd. Agent Patent attorney Toshiyuki Miyauchi

Claims (1)

[Claims] A gun barrel into which a projectile can be loaded, a chamber formed on the rear end side of the projectile of the gun barrel, and an electrical insulator fixed to the rear end of the gun barrel and forming at least a part of the bottom wall of the chamber. It has a cylindrical chamber, a cylindrical electrode, and a cylindrical permanent bar magnet. The bar magnets are arranged concentrically, and a concentric ring-shaped protuberance is provided on the outer diameter of the electrode corresponding to the axial center position of the permanent bar magnet.
The side wall of the chamber located at least on the outer periphery of the raised portion is made of a conductive material, and an energizing device is provided between the side wall of the chamber and the electrode to launch a projectile using a liquid propellant. Device.