JPH0914900A - Thermal cell igniter - Google Patents

Abstract

PURPOSE: To provide a thermal cell igniter suitable for mass production with a simple mechanism and having excellent safety before shooting. CONSTITUTION: A disc 12 has a hollow eccentric shaft 12a, and is rotatably inserted to the central axis 2 of a slave bullet. The slave bullets discharged from a composite bullet in the target sky are moved down while abruptly decelerating the rotation. However, the rotating speed at the time discharging the slave bullet is retained by the inertia at the disc 12, and there occurs a difference from the rotating speed from the slave bullet. A permanent magnet 14 reciprocates by the difference of the speed, and AC power is generated in a coil 16. The power is stored, but when it exceeds a known value, it is output to the igniter of a thermal cell to ignite the cell.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal battery ignition device for igniting a thermal battery of a target detection fuse attached to a sub-bullet of a compound bullet.

[0002]

2. Description of the Related Art A proximity fuze requires a power source for operating an ignition mechanism section having an electric detonator for igniting an explosive charge and an electronic circuit section for transmitting a radio wave to obtain the position of a target object. Is. The power source is preferably one that satisfies the following requirements. That is, 1) Withstand a long-term storage of 10 years or more under a condition of almost no load. 2) There should be no electromotive force during storage. If possible, there should be no electromotive force before launching. 3) At the same time as the launch, the electromotive force should rise within the shortest possible time. 4) The electromotive force is automatically generated by utilizing the environmental change caused by the launch. 5) Small and robust. Low cost and suitable for mass production. 6) The performance test is not a destructive inspection, but 100% inspection is possible. 7) Being resistant to environmental changes such as temperature and atmospheric pressure. It is.

As a power source which substantially satisfies the above requirements, there are a liquid injection type battery, a thermal battery, a wind turbine generator, etc., but each has its advantages and disadvantages, and it is necessary to select it in accordance with the fuze to be used and the type of ammunition. is there. Of these power supplies, thermal batteries are frequently used and have been used frequently for fuzes such as rockets and missiles in the past, but will be attracting attention as power supplies for target detection fuzes in the future.

FIG. 4 is a sectional view showing the structure of a thermal battery.
In this figure, 101 is a unit cell, which has a structure in which an electrolyte that is solid at room temperature is sandwiched between negative / anode plates having different ionization tendencies, and at high temperature (several hundreds of degrees), the electrolyte melts to form a battery. Reference numeral 102 denotes a heat generating agent, and the unit cell 10
Units 1 and 1 are stacked alternately and ignite when heated,
Melt 01 electrolyte. Reference numeral 103 denotes an igniter, which is provided with a heating wire or the like and converts an ignition signal input from the outside into heat to heat the heat generating agent 102. Reference numeral 104 denotes an ignition tool terminal, which is connected to the ignition tool 103. Reference numeral 105 denotes an output terminal, and the output of the stacked unit cells 101 is output to the outside from this terminal. Reference numeral 106 denotes a heat insulating layer, which holds the high temperature when the heat generating agent 102 has a high temperature. 107 is an exterior case.

Currently, a piezoelectric body is used as one of the thermal battery igniters for outputting an ignition signal to the igniter 103.
This piezoelectric body is composed of a hammer, a spring, a lock pin and a piezoelectric element. Before the firing, the hammer is attached to the spring in a contracted state and fixed by the lock pin. Then, upon detection of firing, the lock pin is released, and the hammer is vigorously released by the accumulated spring energy and strikes the piezoelectric element. The piezoelectric element outputs a high-voltage pulse which is an ignition signal when it is hit.

Another set of thermal battery ignition devices is a setback generator. FIG. 5: is sectional drawing which shows the structure of this setback generator. In this figure, 201 is a core, and permanent magnets 202 are provided at both ends thereof.
Reference numeral 203 denotes a spiral spring, which supports the core 201 movably in the elastic axis direction. A coil 204 is installed around the core 201. Then, the core 201 vibrates due to the firing impact, and the permanent magnet 202 moves in and out to generate AC power. 205 is a diode,
The AC power of the coil 204 is rectified into DC power. 206
Is a capacitor. Reference numeral 207 denotes an outer case that houses the coil 204.

As described above, by using the piezoelectric body or the setback generator as the thermal battery igniter, the thermal battery is not activated before being fired and receives the ignition signal output by the firing detection after being fired. Is activated.

[0008]

By the way, in the piezoelectric body used as the above-mentioned conventional thermal battery ignition device, the piezoelectric element outputs the high-voltage pulse as the ignition signal only once after the firing. Further, in the setback generator, since the vibration of the permanent magnet due to the impact of launch is immediately attenuated, power is generated only for a short time after launch. Therefore, these thermal battery ignition devices have a drawback that it is difficult to supply sufficient power to the ignition device of the thermal battery, and the thermal battery is difficult to be activated. Further, in the piezoelectric body, the lock pin is released by some impact before firing, and the hammer hits the piezoelectric element with the stored energy of the spring and outputs a high-voltage pulse, which may activate the thermal battery. was there.

The present invention has been made under such a background, and supplies sufficient electric power for activating the thermal battery above the target, and has excellent safety before ignition. The purpose is to provide a device.

[0010]

According to a first aspect of the present invention, there is provided a thermal battery igniting device for igniting a thermal battery for a target detection fuse, which is mounted on a sub-munition of a compound bullet and has an eccentric shaft, the eccentric shaft. Is a disk rotatably supported in the central portion of the sub-ball, a bar-shaped magnet whose end is in contact with the outer peripheral surface of the disk, and a biasing of the bar-shaped magnet toward the outer peripheral surface of the disk. And a coil arranged around the rod-shaped magnet, and the thermal battery is ignited based on an electromotive force of the coil.

According to a second aspect of the present invention, storage means for storing the electromotive force of the coil, and ignition means for igniting the thermal battery when the voltage level of the power stored in the storage means exceeds a certain value, It is characterized by having.

[0012]

According to the thermal battery igniter having the above structure, the disk rotates in synchronization with the sub-shot immediately after the sub-shot is ejected from the compound bullet. Then, while the sub-balllet drops its rotation speed abruptly in the descending process, the disk tries to continue to rotate at the rotation speed immediately after the ejection of the sub-balllet due to inertia. Therefore, a difference in rotation speed occurs between the sub-bullet and the disc. By the way, since the circular plate has an eccentric shaft, the rod-shaped magnet reciprocates due to the difference in rotational speed, and electromotive force is generated in the coil. The thermal battery is ignited based on this electromotive force.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 3 (a) shows a sub-balllet equipped with a thermal battery ignition device according to an embodiment of the present invention.
This will be described with reference to FIG. In this figure, 1 is a sub-shot, which is housed in a compound bullet and fired. Then, the compound bullet flies while rotating, reaches the target sky, and ejects the sub-munition 1 at the rotation speed there. After that, the sub-ball 1 opens the parachute attached to the rear part and rapidly decelerates and descends while descending. 2 is the central axis of the sub-shot.

Reference numerals 10 and 20 are an AC generator and an ignition control unit, respectively, which constitute the thermal battery ignition device according to this embodiment. The AC generator 10 is attached near the center inside the slave 1 and generates AC power in the descending process of the slave 1. The ignition control unit 20 rectifies and charges the AC power generated by the AC generator 10, and outputs the power when the voltage level rises to a predetermined value. Reference numeral 100 denotes a thermal battery, which is activated by receiving the output power of the ignition control unit 20 and supplies the power to the ignition mechanism unit and the electronic circuit unit of the fuze.
The configuration and operation of the thermal battery 100 have been described in the related art, and therefore will be omitted here.

1 (a) and 1 (b) respectively show an AC generator 1
It is the top view and front view which show the structure of 0. In this figure, 11 is a pedestal. Reference numeral 12 denotes a disc, which has a hollow eccentric shaft 12a at a position of a distance A from the center thereof, and the eccentric shaft 12a is rotatably inserted into the center shaft 2 of the slave bullet. Further, a hole is provided on the outer circumference of the disc 12, and a lock pin is inserted therein (not shown). Then, when the rotation speed of the sub-bullet 1 is low, the rotation of the circular plate 12 is locked by the lock pin, but when the rotation speed of the sub-bullet 1 becomes sufficiently high, the lock pin is disengaged by the centrifugal force, The lock is released.

Reference numeral 13 is a spiral spring. Reference numeral 14 denotes a permanent magnet, which receives an elastic force from the spiral spring 13 toward the central axis 2 of the slave bullet, and the end surface 14a is in contact with the outer circumference of the disk 12. A bobbin 15 is attached to the pedestal 11. A hole 15a is formed in the center of the hole 15a to slidably support the permanent magnet 14. The bobbin 15 also serves as a spring seat for the spiral spring 13. 16
Is a coil, and is wound around the recess of the bobbin 15. The output line is connected to the ignition control unit 20.

FIG. 2 is a circuit diagram showing a circuit of the ignition control unit 20. In this figure, 21 is a rectifying diode,
Reference numeral 22 is a charging capacitor. Reference numerals 23 and 24 are resistors, which are connected in series between both terminals of the capacitor 22. Reference numeral 25 is a thyristor, the gate terminal of which is connected to the connection point of the resistors 23 and 24. When the gate voltage exceeds V1, it is turned on.

In the above structure, it is assumed that the compound bullet flies while increasing the rotation speed and the rotation speed becomes sufficiently high. At this time, the lock pin is disengaged by centrifugal force and the disc 1
The lock of 2 is released, and the circular plate 12 can be rotated.
Then, when reaching the sky above the target, the compound bullet ejects the sub bullet 1. At this time, the disk 12 is rotating in synchronization with the sub-bullet 1.

Next, the sub-shot 1 emits a parachute, and the parachute opens. Then, the sub-munition 1 descends while floating in the air, but in the descending process, it receives a resistance force from this parachute, and the rotation speed is drastically reduced. On the other hand, the disk 12 is unlocked, so
It is not affected by the decrease in the rotation speed of the ball, and tries to continue rotating at the rotation speed at the time of ejecting the sub-ball 1 due to inertia. Therefore, a difference in rotation speed occurs between the sub-bullet 1 and the disk 12. That is, the disk 12 rotates with respect to the sub-balllet 1.

By the way, the rotation axis of the disk 12 is the same as that of the disk 12.
Since the disk 12 is away from the center of the distance A by a distance A, when the circular plate 12 rotates with respect to the sub-ball 1, the permanent magnet 15 reciprocates with the amplitude A. Then, due to this reciprocating motion, the coil 18
The magnetic flux passing through changes periodically, and AC power is generated in the coil 18.

In FIG. 2, this AC power is half-wave rectified by the diode 21, and its output is smoothed and charged by the capacitor 22. The voltage across the capacitor 22 rises over time, and with it the thyristor 25
Also increases the gate voltage. And this gate voltage is V
When it reaches 1, the thyristor 25 is turned on and the electric power charged in the capacitor 22 is output to the igniter 103. Then, the igniter 103 converts this electric power into heat to heat the heat generating agent 102, and the heat generating agent 102 ignites to ignite the unit cell 101.

By the way, the electric power stored in the capacitor 22 can be made sufficiently large by increasing the capacity of the capacitor 22, and the timing of outputting the electric power is the capacity of the capacitor 22 and the resistance ratio of the resistors 23 and 24. Can be controlled by adjusting.

[0023]

As described above, according to the present invention, the thermal battery ignition device has a simple mechanism and is suitable for mass production, and is excellent in safety before being fired by electromotive force generated after the ejection of submunitions. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view and a front view showing the configuration of an AC generator that constitutes a thermal battery ignition device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit of an ignition control unit that constitutes the thermal battery ignition device according to the embodiment.

FIG. 3 is a cross-sectional view showing an outline of a sub-munition mounted with the thermal battery ignition device according to the embodiment.

FIG. 4 is a cross-sectional view showing the structure of a thermal battery.

FIG. 5 is a cross-sectional view showing a configuration of a setback generator that is an example of a conventional thermal battery ignition device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sub-bullet 2 ... Central axis 10 of sub-bullet 10 ... AC generator 12 ... Disc 12a ... Eccentric shaft 13 ... Spiral spring 14 ... Permanent magnet 16 ... Coil 20 ... Ignition control unit 100 ... Thermal battery

Claims (2)

[Claims] 1. A thermal battery ignition device mounted on a sub-bullet of a compound bullet and igniting a thermal battery for a target detection fuse, comprising an eccentric shaft, wherein the eccentric shaft is rotatable in a central portion of the sub-lens. A supported disk, a bar-shaped magnet whose end portion is in contact with the outer peripheral surface of the disk, an elastic member for urging the bar-shaped magnet toward the outer peripheral surface of the disk, and a periphery of the bar-shaped magnet. A thermal battery igniting device comprising: a coil arranged, and igniting the thermal battery based on an electromotive force of the coil. 2. A storage means for storing the electromotive force of the coil, and an ignition means for igniting the thermal battery when the voltage level of the power stored in the storage means exceeds a certain value. Characteristic thermal battery ignition device.