JPS6039667Y2 - igniter - Google Patents

Description

[Detailed description of the invention] The present invention relates to an ignition device that applies electric current to a filament and detonates a detonator by the heat generated by the filament.In particular, it is important to check whether or not the ignition was carried out normally, that is, whether or not the ignition occurred due to the heat generated by the filament due to the ignition current. To provide an ignition device that can later determine whether the ignition was caused by a cause completely unrelated to the ignition current, such as erroneous ignition due to static electricity, or spontaneous ignition of an explosive such as a detonator due to vibration or ambient temperature. .

An example of a circuit of a conventional ignition device will be explained with reference to FIG.

In FIG. 1, 1 is a filament inside the detonator, 2 is a detonator, and 3 and 4 are voltage application terminals.

Then, when operating the ignition device, a voltage is applied between the terminals 3 and 4 to cause an ignition current to flow through the filament 1.

Then, since the filament 1 usually has a resistance value of several ohms or less, it generates heat, and this heat causes the detonator 2 to ignite.

This conventional ignition device has a drawback in that it cannot determine whether the explosion is due to a normal ignition operation or an erroneous explosion due to static electricity or self-heating of the detonator or main explosive.

The present invention aims to eliminate the above-mentioned conventional drawbacks and provide an ignition device that can determine whether or not an explosion is normal.

An embodiment of the present invention will be described below with reference to FIG.

In Fig. 2, 5 is a filament inside the detonator, 6 is a detonator, 7 is a transformer in which a primary winding is inserted in series with the filament 5, and a fuse 8 is inserted in the secondary side of this transformer 7. ing.

9 and 10 are + side, one side voltage application terminals.

Now, when a voltage is applied between the terminals 9 and 10, an ignition current flows through the filament 5, and the heat generated by the filament 5 causes the detonator 6 to ignite.

With this ignition, a secondary short-circuit current flows through the fuse 8 inserted into the secondary side of the transformer 7.

In this case, by using the fuse 8 whose current rating is extremely smaller than the secondary short-circuit current, the fuse 8 instantly melts when the ignition current flows.

Therefore, in the case of normal ignition, the fuse 8 will melt, so by inspecting the fuse 8 after the explosion, it can be determined whether or not the ignition is normal.

Furthermore, since there is no time delay at all between the application of voltage and ignition, it is effective in cases where instantaneous time lag is a problem in ignition.

The ignition device of the present invention is constructed as described above, and has the advantage of being able to determine after an explosion whether the explosion was due to a normal ignition operation or an erroneous explosion due to static electricity, etc. with a very simple construction. It has the following.

[Brief explanation of the drawing]

Figure 1 is an electrical wiring diagram of the ignition system in the conventional example, Figure 2
The figure is an electrical wiring diagram showing one embodiment of the ignition device according to the present invention. 5...Filament, 6...Detonator,
7--trans, 8... fuse.

Claims (1)

[Scope of utility model registration request] The structure is such that a current is passed through the filament and the detonator is detonated by the heat generated by the filament.The primary winding of the transformer is inserted in series with the filament, and the current rated value is determined from the secondary short circuit current on the secondary side of the transformer. An ignition system in which a small fuse is inserted.