JPS63276280A - Destructive apparatus - Google Patents

Abstract

PURPOSE:To obtain a destructive apparatus requiring no consideration from the standpoint of safety management, by supplying charging current to a coil of a superconducting material for an instance for generating stress larger than the strength of the coil material and for explosively breaking the coil. CONSTITUTION:A superconducting coil 11 of an explosively breaking body 25 is wound on an air core 24 disposed at the center of the body so as to make four layers on the air core, and is fixed in the range defined by coil frames 12 and 13. Two electrodes 14 extending from the coil are externally connected with a momentary current supply system 26 and to a cable 15 so that they are remotely controllable. The coil 11 is disposed within a vessel 22 and cooled with liquid nitrogen 23. The instant current supply system 26 charges a high- voltage capacitor 16 through a transformer 21. When a switch 17 is turned ON so that electric energy in the capacitor 16 is injected into the coil momentary, the density of magnetic field of the coil becomes the maximum surpassing a dynamic yield strength of the superconducting material. Thus, the coil is explosively broken in an instance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a demolition device using superconductivity, and particularly to a demolition device that is safe in terms of security since it does not use explosives.

[Conventional technology]

In recent years, development of strong magnetic field generation technology using superconducting phenomena has become active. In particular, research and development of materials that maintain their superconducting state even above liquid nitrogen temperatures is active, and the discovery of superconducting materials at room temperature would have an extremely large impact on industry. In addition, the generation of a strong magnetic field -
As, Magnetic Physics and Its Applications 9, edited by Yoshikazu Ishikawa and Noboru Miura,
There is a method of passing a momentary large current through a coil, as described in Shokabo, published in 1980, pages 45 to 51. In this method, the coil is destroyed when the Maxwell stress of the magnetic field exceeds the mechanical strength of the material forming the coil. By the way, the explosive invented by the chemist Nobel, known as dynamite, has had a huge impact on industry. Its advantage is its high destructive power.

[Problem that the invention seeks to solve]

Due to the large destructive power of the above conventional explosives, their production and
Extreme care must be taken when storing and transporting it, and therefore, sufficient consideration must be given to security control not only when it is used as a destructive device, but also at all times.

An object of the present invention is to provide a destruction device that requires almost no consideration in terms of security management.

[Means for solving problems]

The above purpose is to form a coil using a superconducting material, and to generate a strong magnetic field in which the magswell stress of the magnetic field exceeds the material strength of the coil by instantaneously passing electrical energy charged in a capacitor through the coil. This can be achieved by causing an explosion.

[Effect]

The principle of the present invention will be explained with reference to the schematic diagram shown in FIG.

1 is a coil, 2 is a capacitor, and 3 is a switch. now,
It is assumed that a charge is stored in the capacitor 2, and then when the switch 3 is closed, a current 2 starts instantaneously flowing in the series circuit including the coil 1 in the direction of the arrow. At this time, a magnetic field H is generated in the coil 1 in the direction of the arrow in the figure. In the space where the magnetic field occurs, in the direction parallel and perpendicular to the magnetic field, respectively.

A Maxwell stress with a magnitude of 1 μoH2 acts. μ here. is the magnetic permeability in vacuum. Due to this Maxwell application, in the case of FIG. 1, the coil 1 tends to contract in the direction of the magnetic field H, the diameter of the coil tends to increase, and the coil expands. The magnitude of stress is proportional to the square of the magnitude of the magnetic field, so if the magnetic field H becomes extremely large, the magnitude of stress will exceed the mechanical strength of the material forming the coil, causing the coil to break. The present invention makes use of this destructive energy, and by forming a coil using superconducting material, the coil is made to have a larger current than a coil made of ordinary materials by discharging a large instantaneous current to the coil. Since there is no electrical resistance, a larger current can flow and therefore a larger magnetic field can be obtained. As a result, the Maxwell stress caused by the magnetic field is also large, and therefore the energy associated with destruction is also large. In addition, when using ordinary explosives, they are destroyed and at the same time high temperature.

Although high heat is generated and fires are often involved, according to this method, only mechanical work is performed due to the explosion of the coil, so it is highly safe in terms of fire prevention.

If electrical energy charged in a capacitor is instantaneously passed through a superconducting coil, a strong magnetic field exceeding the material strength of the coil will be generated based on the above principle, causing the coil to explode and break.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. It is composed of an explosive destructor 25 using a superconducting coil and an instantaneous current supply system 26 to the coil.

In the explosion destructor 25, 11 is a coil using a superconducting material, which is wound around an air core 24 in the center in a four-layer structure, and has an inner diameter of 10 mmφ.

The coil frame 12 has an outer diameter of 50-mφ and a length of 60 mm.
and fixed within the range of 13. Two electrodes 14 are provided from the coil, which is connected to an external instantaneous current supply system 26 via a cable 15 to enable remote operation. The coil 11 is connected to the container 2 so that it can generate a magnetic field in a superconducting state.
2 and cooled to 77K with liquid nitrogen 23. To store electrical energy in the instantaneous current supply system 26, a high voltage capacitor (capacity 64
0 microfarad) 16 to 30 kilovolts. At this time, the electrical energy obtained from the electricity storage device 16 is approximately 300 kilojoules.

When the switch 17 is turned on and the electrical energy stored in the W electric appliance 16 is instantaneously injected into the coil 11,
A large current of approximately 70 kiloamperes flowed through the superconducting wires forming the coil, and the density of the magnetic field generated near the center of the coil momentarily reached 90 Tesla. By generating the above maximum magnetic field, the Maxwell stress of the magnetic field is 200 kg/ms + the mechanical yield strength of the superconducting material forming the coil is 100 kg/ms.
+ue'', and the coil instantly exploded and was destroyed. The destructive force generated by this explosion failure event was equivalent to about 5 to 10 durams of TNT made from trinitrotoluene.

In the above embodiment, a coil made of a superconducting material was cooled with liquid nitrogen and used to generate a strong magnetic field, but it goes without saying that such a phenomenon can also be applied at room temperature.

【Effect of the invention〕

As explained in the above embodiments, according to the present invention, a destructive device can be realized which has a large destructive force and does not require special equipment for safety during manufacture, transportation, and storage.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the principle of the present invention, and FIG. 2 is a schematic diagram showing an embodiment of the present invention. 1.11...Coil, 2,16...M electric appliance. 3.17.19... Switch, 4, 25... Explosive destruction body, 12.13... Coil frame, 14... Electrode, 1
5... Cable, 18.20... Diode, 21
...Transformer-122...Container, 23...
・Liquid nitrogen, 24...air core, 26...instantaneous current supply system. 7′°l・),

Claims (1)

[Claims] 1. A destruction device comprising a coil made of a superconducting material and a capacitor connected to the coil by a conductive cable, and which instantaneously flows electrical energy charged in the capacitor to the coil.