KR20120053595A - Electric detonator having a built in variable resister - Google Patents

Abstract

The present invention relates to an electric primer used in blasting or military bombs.
Conventional electric primers have caused unexpected explosions due to induced currents caused by lightning strikes or leakage currents caused by leakage of electrical facilities.
The present invention is to provide an electrical primer that is not easily exploded from electrical risk by connecting the varistor to the conventional electrical primer.
Unlike the conventional connection method of connecting the varistor to the two wires of the input and output terminals in parallel, the present invention connects the varistor to each wire of the electric primer in series so that the electric circuit is cut off at a current below a specific voltage, so that the electric primer does not explode. Above a certain voltage, electrical circuits are connected to explode the electrical primer.
As described above, the electric primer equipped with a varistor is electrically insensitive compared to the conventional electric primer and does not explode at a current lower than the electric blaster, so a tunnel blasting site using a high voltage electricity or a military bomb installed in a place where there is a risk of lightning strike etc. It will be useful as a primer.

Description

Electric Primer with Varistor {ELECTRIC DETONATOR HAVING A BUILT IN VARIABLE RESISTER}

The present invention relates to an electric primer used for blasting or military bombs, the conventional electric primer caused an unexpected explosion accident due to surge current due to lightning or leakage current due to short circuit.

Accordingly, the present invention is to solve the above problems is to provide an electrical safety electric primer that is exploded only by the electric blaster without explosion at a voltage below the electric blaster by embedding the varistor in the conventional electric primer.

Conventional electric primer can be exploded with only 1.5V batteries commonly used in homes, so it was necessary to pay special attention to leakage current or induction current caused by lightning when blasting work.

In particular, the excavation equipment used in underground excavation works such as tunnels and subways use high voltage electricity to minimize the generation of soot and dust, and the blasting method using the electric primer is inevitably exposed to electrical risks. There was no.

In addition, lightning generated outside the tunnel is absorbed through the ground, and when a small current flows through the electric primer charged at the end of the tunnel, an unexpected explosion occurs, causing a terrible blasting accident that takes away precious lives.

In recent years, non-electric primers have been developed and used to safely blast from such electrical hazards. However, the cost of detonating shock tubes of non-electric primers requires expensive detonation costs. Detonation method using electric primer with low detonation cost is implemented.

However, the conventional electric primer may explode due to leakage current due to high voltage electricity inside the tunnel and surge current due to lightning that may flow outside the tunnel, and thus, an electric primer that is safe from electrical hazards is required.

The present invention is to improve the conventional electric primer to provide a safe electric primer that explodes only in a high-voltage current such as an electric blasting machine without explosion to the electrical current inside the tunnel and the surge current that can be introduced from the outside of the tunnel.

In order to achieve the above object, the present invention connects a varistor to a conventional electric primer so that no current flows at all in the platinum bridge of the electric primer.

The varistor is connected in parallel to the two wires of the input and output terminals of the electric circuit and exists as a non-conductor for normal current, but when an unexpected high voltage is applied, the varistor rapidly turns into a conductor so that the high voltage current falls directly into the output terminal without passing through the electric circuit. A semiconductor device that protects an electric circuit.

The present invention uses the characteristics of the varistor, unlike the conventional connection method connected in parallel to the input and output terminals of the electrical circuit by connecting the varistor to each line of the electric primer in series, the electric circuit is cut off at a current below a specific voltage The primer does not explode, and the electrical circuit is configured to connect the electrical circuit above a certain voltage, so that the electrical primer explodes.

 As described above, the electric primer equipped with a varistor is electrically insensitive to the conventional electric primer and does not explode at a current below the electric blasting machine, so that a tunnel blasting site using high voltage electricity or a military bomb installed in a place where there is a risk of lightning strike It will be useful as a detonator for detonation.

1 is a circuit diagram showing the most common use of varistors
2 is a cross-sectional view of a conventional electric primer and a varistor built-in electric primer
3 is a current flow diagram of the electric primer with a built-in varistor below a specific voltage
4 is a current flow diagram of the electric primer equipped with a varistor above a specific voltage

Conventional electric primers are designed to explode at small currents in order to explode a large amount of primers using an electroblasting machine.

Therefore, the conventional electric primer can explode in very small amount of current such as surge current caused by lightning strike, leakage current caused by leakage of electric facilities, induced current caused by radio waves, static electricity caused by friction, etc. Special care was needed from

Accordingly, the present invention is to provide an electrically insensitive electrical primer that is only exploded by an electric blasting machine by embedding a varistor in a conventional electric primer.

The detailed configuration and role of the varistor built-in electric primer through the accompanying drawings as follows.

1 is a circuit diagram showing the most common use of the varistor.

A varistor is a semiconductor having a characteristic of an insulator having an infinite resistance value at a current below a specific voltage, but having a characteristic of a conductor due to a rapid decrease in resistance value when a current above a specific voltage is applied.

In general, the varistor 30 is connected in parallel to the two lines of the input and output terminals of the electrical circuit as shown in the above circuit diagram, and is normally present as a non-conductor, but when a high voltage is applied due to lightning or an abnormality of the line, the varistor 30 rapidly turns into a conductor. Is an electric circuit protection device that allows an output terminal to immediately exit without going through an electric circuit.

The present invention utilizes this characteristic of the varistor. Unlike the conventional connection method in which the varistor is connected in parallel to two lines of an input / output terminal of an electric circuit, the varistor is connected in series to each line 10 of the electric primer, so The electrical circuit is cut off and the electrical primer is not exploded, the electrical circuit is connected only at a specific voltage or more so that the electrical primer is exploded.

In the present invention, the specific voltage means the output voltage of the electric blast generator, and indicates that the electric primer should not be exploded at a current less than the voltage output from the electric blast generator.

2 is a cross-sectional view of a conventional electric primer and a varistor built-in electric primer.

Looking at the structure of a conventional electric primer as shown in Figure 2 [A] is a primer line 10 within 10M consisting of two lines having an insulation coating line, and connected to each line to generate heat by a short circuit when current flows Explosive power of the platinum bridge 11, the ignition jade 12 easily ignited by the heat of the platinum bridge, the new device 13 for controlling the explosion time, the explosives 14 made of explosive sensitive explosives, And a primer 15 for detonating the main body explosive and a primer 16 made of aluminum or copper.

As shown in the figure, the conventional electric primer has no safety device against electricity, so when a small voltage current such as a home battery flows through the primer line 10, it explodes.

Therefore, the present invention is to insert the varistor which is a safety device in the conventional electric primer so that the electric primer explodes only when intentionally flowing a high-voltage current.

2B is a cross-sectional view of the electric primer with a varistor built-in.

As shown in the figure, the varistor is inserted in series between the tip of the primer line 10 and the platinum bridge 11 to block the circuit until a current of a specific voltage flows.

As shown in the drawing, the connection structure of the varistors is to connect the varistors 30 in series to the two lines of the primer line 10 so that no current of any type can reach the platinum bridge 11 below a specific voltage. Would be preferred.

In addition, the electrical primer with a built-in varistor has a high resistance because the circuit is broken, and a conduction tester that checks for abnormalities of the electrical primer by sending a small current to the electrical primer has no resistance. ) In parallel to the tip of the primer line 10 is connected to the varistor.

The resistance value of the electric resistance should be such that the electric current of the blast generator does not easily escape through the resistance.

3 is a current flow chart of an electric primer equipped with a varistor below a specific voltage.

As shown in the figure, when a current less than the voltage at which the varistor operates flows in the primer line 10, the current does not pass through the varistor and returns through an electrical resistance 20 connected in parallel to the primer line 10.

4 is a current flow chart of an electric primer equipped with a varistor above a specific voltage.

As shown in the figure, when a current above the voltage at which the varistor operates flows in the primer line 10, the varistor becomes a conductor, causing the current to flow through the platinum bridge 11 and exploding the electric primer.

As described through the drawings, the electric primer with a varistor built-in will explode only by a high-pressure electric blaster, so it will be used safely in an electrical hazard place.

An electric primer with a built-in varistor requires high-voltage electricity, so it can be connected in parallel several times under the voltage allowed by the electric blaster, but it is not possible to connect hundreds of feet like a conventional electric primer. It is an electric primer used for the purpose.

Specifically, an electric primer equipped with a varistor is expected to be used for a detonating primer for triggering a signal tube of a non-electrical primer, or a primer such as a military bomb used in a danger zone of a lightning strike.

In addition, a varistor connected in series between the wires of the electric primer and the platinum bridge may be replaced with an electric resistance or a zener diode to construct an electric circuit of a similar method, but this is an application technology having the same purpose and effect as the configuration of the circuit. The changeable circuit is not described one by one.

10: Primer 11: Platinum Bridge
12: ignition jade 13: burning device
14: Detonation Pill 15: Stem Pill
16: primer
20: electrical resistance 30: varistor

Claims (2)

In the electric primer, the varistor 30 is connected in series between the distal end of the primer tube 10 inserted into the primer body 16 and the platinum bridge 11, and the primer line 10 inserted into the primer body 16. Electric primer with a varistor, characterized in that the electrical resistance 20 is connected in parallel to the two lines.
The varistor has a built-in varistor, characterized in that the electrical circuit is cut off at a current of less than a certain voltage to prevent the electrical primer is not exploded, the electrical circuit is connected to the electrical circuit is exploded above a certain voltage. Electric primer.

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