RU2105263C1 - Method of ignition of powder charges of pyrotechnic installations and device for its realization - Google Patents

Abstract

FIELD: pyrotechnic installations. SUBSTANCE: the methods consists in employment of an igniter used to impact the necessary heat pulse to the charge and electrical current for initiation of fire. The igniter is made of smoke powder, whose grains a coated with a thin layer of current-conducting compound, for instance, aluminium powder. An electric are is used for initiation of fire. The device realizing the method has body 1 with blast chamber 3, unit 4 used to introduce the charge into the chamber, electric power source and a means for initiation of fire. Chamber 3 accommodates bulk powder charge 7. Dielectric insert 9 with a taper recess for igniter 8 is located in the center of the chamber lower part. Bare leads of electrodes 10 connected to the power source are positioned on the insert bottom. When voltage is applied to the electrodes, a short circuit occurs between the electrode leads due to the current-conducting coating, with a subsequent generation of an electric arc, ignition of the igniter and of the main charge. EFFECT: facilitated procedure. 2 cl, 1 dwg

Description

 The invention relates to means for initiating powder charges, in particular charges of pyrotechnic installations as a part of sources of seismic signals of a mine and mortar-plunger type.

 A known method of ignition of powder charges, based on the use of an igniter to communicate a heat pulse to the main charge and electric current to initiate fire (SU, ed. St. N 792186, class G 01 V 1/04, 1980). The method consists in the fact that a certain amount of a gas mixture is introduced through a special channel into the chamber where the bulk powder charge is placed, then this mixture is ignited using an electric spark device.

 The main disadvantage of this method is the need to use two types of energy carrier (gunpowder and gas mixture), which complicates the design of the pyrotechnic installation and reduces the safety of its maintenance.

 The objective of the invention is to simplify and improve the safety of the method of ignition of bulk powder charges in pyrotechnic installations.

 This problem is solved by the fact that when igniting the powder charges of pyrotechnic installations using an igniter to communicate the required heat pulse to the main charge and the electric current for initiating fire, an additional bulk powder charge, for example from smoke powder, is used as an ignitor, and use as an electric means of initiating fire an electric arc, while the grains of the additional powder charge during manufacture are coated with a thin layer of conductive composition, for example aluminum powder.

 A device is known in which a method of igniting powder charges of pyrotechnic installations is implemented, based on the use of an igniter to communicate the required heat pulse to the main charge and electric current to initiate fire (see auth. St. 792166). The known device comprises a housing with an explosive chamber for a source of seismic signals, nodes for introducing a charge and an igniter into the chamber, an electric current source and an electric spark means for initiating fire.

 A disadvantage of the known device is the complexity of the design and the associated low reliability.

 The objective of the invention is to simplify the design for the operation of the pyrotechnic installation, as well as improving the reliability and safety of its operation.

 This problem is solved by the fact that in the device for implementing the method of ignition of powder charges containing a housing with an explosive chamber for a source of seismic signals, a node for introducing a charge into the chamber, an electric current source and means for initiating fire, bulk powder charge and an igniter are placed in the explosive chamber, grains which is covered with a thin layer of conductive material, and the means of initiating fire is located in the lower part of the explosive chamber and is made in the form of a dielectric insert with a conical angle Blenheim in the center of the igniter and the two electrodes to form an electric arc.

 The invention is illustrated in the drawing, where a partial section shows a variant of the device (source of seismic signals of the mortar type), which implements the proposed method of ignition of a bulk powder charge.

 The device comprises a housing 1 with a support plate 2 and an explosive chamber 3, a charge entry unit 4, a plunger 5 with a gauge shaft 6, a main powder charge 7, an igniter 8, a dielectric insert 9, electrodes 10 and a lead cable 11. The explosion chamber 3 is made coaxially with the caliber part 6, and its diameter is equal to or less than the diameter of the caliber part of the housing 1. The dielectric insert 9 is placed in the lower part of the chamber 3 and has a conical recess on the side of the chamber, at the bottom of which the bare ends of the electrodes 10 are located.

 The device operates as follows.

 The explosive chamber 3 through the input unit 4 serves the bulk charge of the igniter 8, and then the main powder charge 7. The igniter settles at the bottom of the recess of the liner 9 around the exposed ends of the electrodes 10. When applying voltage between the ends of the electrodes, due to the presence of a conductive coating on the grains of the ignitor , a short circuit is formed with the appearance of an electric arc, as a result of which the igniter 8 ignites and from it the main charge 7.

 The proposed method and device provide ignition of bulk powder charges of various capacities in pyrotechnic installations operating automatically or in remote control mode.

Claims (2)

 1. A method of igniting the powder charges of pyrotechnic installations, based on the use of an igniter to communicate the required heat pulse to the main charge and an electric current to initiate fire, characterized in that an additional bulk powder charge, for example, from smoke powder, is used as an ignitor, and as an electric the means of initiating fire use an electric arc, while the grains of the additional powder charge in the manufacture are covered with a thin layer of the current lead present composition, such as aluminum powder.  2. A device for igniting the powder charges of pyrotechnic installations, comprising a housing with an explosive chamber for a source of seismic signals, a node for introducing a charge into the chamber, an electric current source and fire initiating means, characterized in that bulk powder charge and an igniter are placed in the explosive chamber, the grains of which covered with a thin layer of conductive material, and the means for initiating fire is located in the lower part of the explosive chamber and is made in the form of a dielectric insert with a conical recess in the center for ignition and two electrodes for the formation of an electric arc.