JP3428049B2 - Cartridge for electrothermal chemical gun - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell for electrothermal chemical guns, and more particularly to a novel method for controlling the reaction between a powder reactant and water by selecting the impedance, mass and surface area of an electric heating element. Related to improvements.

[0002]

2. Description of the Related Art As an example of a conventional electrothermal chemical bullet, a configuration shown in FIG. 6 has been developed by the present applicant.
That is, the reference numeral 1 in FIG. 6 is a casing having a substantially tubular shape as a whole and made of an electrical insulator, and a screw hole formed at the axial center of the rear wall 1aA of the rear end 1a of the casing 1. 1aB includes an electric heating element 10 described later.
The electrode 2 to which one end of is connected is exposed and screwed. A screw hole 5 is formed on the inner wall of the tip 1b of the casing 1, and the screw 3a of the cup-shaped conductive connector 3 is screwed into the screw hole 5. There is. On the inner wall 3b of the connector 3, a powder container 6 having a cup shape as a whole and made of a conductive metal is closely held. A bullet 4 is placed in the opening 6a of the powder container 6.
Is inserted, and the rear end 4a of the bullet 4 is inserted up to approximately the center position of the inner wall 6b in the longitudinal direction. Further, a reaction chamber 8 in which a powdery reactant 7 made of powdery aluminum or boron is charged in a hermetically sealed state is provided behind the bullet 4.

A water accommodating chamber 9 in which water is enclosed is formed at a rear position of the reaction chamber 8, and the water accommodating chamber 9 is formed by the rear wall 3c of the connector 3, the casing 1 and the electrode 2 walls. It is defined and independent of the reaction chamber 8. Further, in the accommodation chamber 9, a heating wire (a conductive wire such as aluminum or carbon) for heating water to generate high-temperature and high-pressure steam.
An electric heating element 10 constituted by is provided. This electric heating body 1
One end of 0 is connected to the electrode 2, and the other end of the electric heating element 10 is connected to the rear wall 3c of the connector 3. Therefore, the electric heating element 10
The connector 3 and the powder container 6 and the electrode 2 are electrically connected to each other through. Further, the electrode 2 and the powder container 6 are connected in series via a switch 11 and a power supply 12.

Next, the operation of the electrothermal chemical bullet having the above construction will be described. Aluminum powder is used as the powder reactant 7, and an aluminum wire is used as the electric heating element 10. First, when the switch 11 is turned on, a current is applied between the electrode 2 and the connector 3 to heat the electric heating element 10 in water. At this time, high-temperature and high-pressure steam containing hydrogen gas is generated. When the vapor pressure at this time exceeds a certain pressure in the water storage chamber 9, as shown in FIG. 7, the rear wall 3c of the connector 3 and the powder container, which are the most fragile walls defining the water storage chamber 9, are formed. The rear wall 6c of 6 is destroyed by the vapor pressure, and as a result, high-temperature and high-pressure steam is injected into the powder reactant 7.
Then, at the same time that the steam heats the powder reaction product 7, a rapid chemical reaction occurs in the reaction chamber 8, and particles of hydrogen 13 and aluminum oxide 14 of high temperature and high pressure are generated. As a result, the bullet 4 is pressed by the generated pressure of both hydrogen 13 and aluminum oxide 14 that are explosively generated, and the bullet 4 is fired.

[0005]

Since the conventional electrothermal chemical bullet has the above-described structure, it has the following drawbacks. That is, since the fuse, which is an electric heating element, has a linear shape, it is difficult to balance the impedance, surface area, mass, etc. of the electric heating element with each other when trying to obtain an electric heating element having an impedance suitable for reaction. For example, when trying to obtain a predetermined reaction output, first, the mass value of the electric heating element is determined. For this mass value, there is an optimal surface area and impedance for reaction control during reaction,
In order to control the reaction state, it is necessary to simultaneously satisfy these plural boundary conditions. However, when the electric heating body is in the form of a fuse, for example, when the mass value and the surface area are determined, the impedance is unilaterally determined, and the impedance at this time is not always optimal for the reaction, and the plurality of boundary conditions are set. It was difficult to meet.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones, and in particular, has a structure in which metal bodies in which electric heating elements are wound in a spiral shape are laminated, and the number of layers is
An object of the present invention is to provide a cartridge case for an electrothermal chemical gun in which the impedance, mass and heating efficiency of an electric heating element can be easily selected by selecting the thickness, length and shape of a metal plate.

[0007]

A shell for an electrothermal chemical gun according to the present invention is arranged in a casing to generate high-temperature and high-pressure steam by an electric heating element made of aluminum, and the steam is injected into a powder reactant. In a casing for an electrothermal chemical gun, wherein a bullet is driven by the pressure gas generated by inducing a chemical reaction of the water vapor and the powder reactant, the bullet and the powder reactant are contained in the casing. A powder container located at, and an electrode screwed to the rear end portion of the casing, the electric heating element is provided between the powder container and the electrode in a conductive state, and, A plurality of spirally wound metal bodies are stacked along the axial direction and the longitudinal direction of the casing to control the contact pressure between the metal bodies.
By selecting the contact resistance by controlling
This is a configuration that selects the pedestal .

More specifically, the metal body is composed of a metal plate.

More specifically, the metal body is composed of a honeycomb metal plate.

More specifically, the surface area of the electric heating element is selected so that the heating efficiency of the electric heating element is selected.

[0011]

In the case of the electrothermal chemical gun according to the present invention, first, when the switch is turned on, an electric current is applied between the electrode and the connector to heat the electric heating element in the water. At this time,
High-temperature, high-pressure steam containing hydrogen gas is generated. When this vapor pressure exceeds a certain pressure in the water storage chamber, the rear wall of the connector and the rear wall of the powder container, which are the most fragile walls defining the water storage chamber, are destroyed by the vapor pressure, and as a result, High temperature, high pressure steam is injected into the powder reactant. Then, at the same time that the water vapor heats the powder reaction product, a rapid chemical reaction occurs in the reaction chamber, and high temperature and high pressure hydrogen and aluminum oxide particles are generated. As a result, the bullet is pressed by the generated pressure of both hydrogen and aluminum oxide that are explosively generated, and the bullet is fired. The powder reactant 7 is aluminum powder, the metal plates 10a, 10b constituting the electric heating element 10,
As 10c and 10d, the case where an aluminum plate is used is shown.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the cartridge case for electrothermal chemical gun according to the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a cylindrical casing made of an electric insulator, and an electrode 2 is screwed into a screw hole 1aB of a rear end portion 1aA of the casing 1. A tubular and electrically conductive connector 3 is screwed onto the tip portion 1b of the casing 1. A cylindrical conductive powder container 6 is closely attached and fixed to the inner wall 3b of the connector 3, and a bullet 4 is fitted into the tip of the powder container 6. A reaction chamber 8 formed behind the bullet 4 is filled with a powdered reactant 7 such as aluminum or boron in a close contact state.

Water (not shown) is provided behind the reaction chamber 8.
A water storage chamber 9 into which is injected is formed, and an electric heating body 10 for heating and evaporating the water is wound in a spiral shape in the water storage chamber 9 to form metal plates 10a and 10b as metal bodies.
10c and 10d (shown in FIG. 2) are stacked along the axial direction and the longitudinal direction of the casing 1, and the electric heating element 10 is brought into contact with the electrode 2 and the connector 3 to be electrically connected. Conductive, the connector 3 and the powder container 6, and the electrode 2
Are in a conductive state having an electrically suitable impedance. The electric heating element 10 is located between the powder container 6 and the electrode 2, and the electrode 2 and the powder container 6 are connected in series via a switch 11 and a power supply 12.

Next, a description will be given of a case in which the bullet is actually fired by using the above-mentioned construction and the shell for an electrothermal chemical gun. First, when the switch 11 is turned on, a current is applied between the electrode 2 and the connector 3 to heat the electric heating element 10 in water. At this time, high-temperature and high-pressure steam containing hydrogen gas is generated. When the vapor pressure at this time exceeds a certain pressure in the water storage chamber 9, as shown in FIG. 7, the rear wall 3c of the connector 3 and the powder container, which are the most fragile walls defining the water storage chamber 9, are formed. The rear wall 6c of 6 is destroyed by the vapor pressure, and as a result, high-temperature and high-pressure steam is injected into the powder reactant 7. Then, at the same time that the steam heats the powder reactant 7, the reaction chamber 8
A rapid chemical reaction takes place inside the particles of hydrogen 13 and aluminum oxide 14 at high temperature and high pressure. as a result,
The bullet 4 is fired by pressing the bullet 4 with the generated pressure of both hydrogen 13 and aluminum oxide 14 which are explosively generated. The powder reactant 7 is aluminum powder, and the electric heating element 10
Aluminum plates are used as the metal plates 10a to 10d constituting the above.

In the above-described embodiment, the structure of the electric heating element 10 is
Although the metal plates 10a to 10d are shown as four layers,
Other numbers of stacks may be used. Further, the shape of the metal plate may be a honeycomb metal plate structure in which a thin metal plate is bent into a honeycomb shape as shown in FIGS.

Further, since the above-mentioned electric heating element 10 is wound in a spiral shape and the metal plates 10a to 10d are laminated and used, by selecting the number of laminated metal plates 10a to 10d, shape, length and thickness. , Changing the contact resistance between the metal plates,
Since the contact resistance at this time can be easily changed to about 100 times the specific resistance of the metal by controlling the contact pressure, the impedance of the entire electric heating element 10 is arbitrarily selected, and the heating efficiency, The combination of masses can be arbitrarily selected.

[0017]

As described above, according to the present invention, the electric heating element is formed by laminating the spirally wound metal plates, and the number of layers, the thickness, the length, the shape of the metal plates, etc. are set. By making a selection, the combination of heating efficiency, impedance, mass, etc. of the electric heating element is arbitrarily determined, so that the optimum electric heating element for the desired reaction can be easily obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram showing a cartridge case for an electrothermal chemical gun according to the present invention.

FIG. 2 is a plan view of the electric heating element shown in FIG.

FIG. 3 is a side view of the electric heating element shown in FIG.

FIG. 4 is a plan view showing another embodiment of FIG.

5 is a side view of the electric heating element of FIG. 4. FIG.

FIG. 6 is a cross-sectional configuration diagram showing a conventional electrothermal chemical bullet.

7 is a cross-sectional view showing the firing start state of FIG.

[Explanation of symbols]

1 casing 4 bullets 7 Powder reaction product 10 Electric heating element 10a to 10d Metal body (metal plate)

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Claims (4)

(57) [Claims] 1. A high-temperature high-pressure steam is generated by an electric heating element (10) which is arranged in a casing (1) and made of aluminum, and the steam is injected into a powder reactant (7), In the case of an electrothermochemical gun cartridge in which the bullet (4) is driven by the pressure gas generated by inducing the chemical reaction of the powder reactant (7), the bullet (4) and the powder reactant (7 )
With a powder container (6) located in the casing (1),
An electrode (2) screwed to the rear end (1aA) of the casing (1)
The electric heating body (10) is provided between the powder container (6) and the electrode (2) in a conductive state with each other, and a plurality of spirally wound metal bodies (10a). ~ 10d) are laminated along the axial direction and the longitudinal direction of the casing (1), and the contact pressure between the metal bodies (10a to 10d) is controlled to control the contact resistance.
The impedance of the electric heating element (10) is selected by selecting the resistance.
A shell for an electrothermal chemical cannon characterized by being configured to select a space. 2. The cartridge case for an electrothermal chemical gun according to claim 1, wherein the metal body (10a-10d) is made of a metal plate. 3. The cartridge case for an electrothermal chemical gun according to claim 1, wherein the metal bodies (10a to 10d) are made of a honeycomb metal plate. 4. The electric heating according to claim 1, wherein the heating efficiency of the electric heating body is selected by selecting the surface area of the electric heating body. Chemical shell case.