A high-efficiency electrostatic protection component of a disc varistor for a bridge wire type electric detonator

Abstract

The invention relates to a high-effect electrostatic protective component of a disk type voltage dependent resistor for a bridge-wire electric detonator. The high-effect electrostatic protective component comprises a disk type PCB and two voltage dependent resistor electrostatic protective electronic devices, wherein one voltage dependent resistor is connected with a pin-pin ignition loop in parallel via a circuit board, and the other voltage dependent resistor is connected with a pin-shell ignition loop in parallel via a circuit board; two sawtooth-shaped discharge electrodes are configured at the reverse side of the PCB, and form a pin-shell air gap electrostatic discharge channel together with the inner wall of a metal tube shell; the sawtooth-shaped discharge electrodes and the electrostatic protective devices are connected in parallel to form a double-insurance effect with pin-shell electrostatic protection. The pin-shell protection effect of the electrostatic protective component achieves the human body static electricity resistance above 50kV; the pin-pin protection effect achieves the human body static electricity resistance above 30kV, and can withstand multiple times of impact by electrostatic discharge without any capability change.

Description

[0001] Technical field [0002] The patent of the present invention belongs to the electrostatic protection electronic device of electric pyrotechnics, especially the high-efficiency electrostatic protection electronic device suitable for sensitive bridge wire electric detonator. Background technique [0003] The existing bridge-wire industrial electric detonators are susceptible to performance changes or accidental ignition due to the influence of static electricity and stray currents during use. In the process of production, assembly, storage, transportation, use and maintenance of pyrotechnics and weapon systems, the hazards of electrostatic discharge are ubiquitous. Static electricity has the characteristics of high voltage, low energy, and high transient. The coupling of electrostatic discharge energy may It will affect the ignition performance (sensitivity, ignition time, etc.) and safety performance (safety current, etc.) of EPDs, and even lead to blind or accidental ig...

AI Technical Summary

Problems solved by technology

[0005] The anti-static structure disclosed in Chinese patent CN201210540239.9 is to insert a horizontal discharge metal connector at the rear end of the detonator. The size is relatively large, and it is not suitable for long legs or small-sized detonators.

The connection between the metal connector and the leg wire of the detonator is connected by crimping, which may easily cause the electrode to fall off and the protection circuit to be disconnected, making the electrostatic protection circuit invalid

The external plug-in discharge metal connector increases the difficulty of the detonator manufacturing process. If the detonator is inserted after the detonator is formed, it will easily cause accidental ignition and cause danger. However, the external insertion of the detonator before the detonator is formed will bring great inconvenience and trouble to the detonator manufacturing process. At the same time, the external insertion of the horizontal discharge metal connector will limit the use of the detonator. In the case of high overload of the missile, the external large horizontal circuit board is easy to fall off and pose a danger to the system. When there is no extra space for use, the external large horizontal circuit board is inserted. board will bring danger to the entire system

And the patent does not explain the protective effect of static electricity

[0006] The anti-static structure disclosed in Chinese patent CN201220055188.6 is only used in the semiconductor bridge detonator, and only one sharp corner discharge is used to protect the foot-shell static electricity, because the product will pass at least 3 to 5 people during the transportation and assembly process Discharging the product may cause melting and deformation of the sawtooth after one discharge, thus losing the electrostatic protection effect, and danger will occur after multiple discharge impacts; at the same time, the patent does not give a protective effect, nor does it propose anti-static protection for multiple times. Shock, more did not raise the size of the product size

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