Graded propellant powder chamber pre-ignition launching device and method for fire extinguishing bullet launching

Abstract

The invention discloses a graded propellant powder chamber pre-ignition launching device and method for fire extinguishing bullet launching. The device comprises a launching tube, propellant powder, apiston, an ignition device, a fire extinguishing bullet, a primary propellant powder chamber, a fire transferring device, a sealing ring, a support frame and a secondary propellant powder chamber. The method comprises the steps that the propellant powder is loaded in a serial split charging mode, the propellant powder in the front secondary propellant powder chamber is ignited through the ignition device to burn, generated propellant powder gas pushes the fire extinguishing bullet to move forwards, and the piston is kept still under the action of the support frame; when the pressure in the secondary propellant powder chamber reaches a set value, the propellant powder in the primary propellant powder chamber is ignited through the fire transferring device; then the piston moves forwards under the action of pressures in the two propellant powder chambers, the fire extinguishing bullet is pushed to move forwards until the fire extinguishing bullet is separatedfrom a launching tube outlet; and the piston and the fire transferring device are continuously pushed by the propellant powder gas in the primary propellant powder chamber to move forwards until the piston and thefire transferring deviceare separated from the launching tube outlet. A higher initial velocity of the bullet with a lower maximum chamber pressure can be reached under the premise of the same charge amount, and therange of the fire extinguishing bullet is enlarged.

Description

technical field [0001] The invention relates to the technical field of launching fire extinguishing bombs, in particular to a grading chamber pre-ignition launching device and method for launching fire extinguishing bombs. Background technique [0002] Fire extinguishing bomb is a new type of special fire extinguishing tool. Larger caliber fire extinguishing bomb equipment is mainly suitable for extinguishing fire points that cannot be easily reached by ordinary people such as long-distance and high-rise buildings. It has the advantages of convenient use and high power, and can prevent people from directly entering Danger to persons due to fire. The existing fire extinguishing bombs are mainly small fire extinguishing bombs suitable for manual throwing. The disadvantage is that the payload is low due to the limited volume and weight. However, the use of large-caliber fire extinguishing bombs can effectively increase the payload and improve the fire extinguishing efficiency. ...

AI Technical Summary

Problems solved by technology

The existing fire extinguishing bombs are mainly small fire extinguishing bombs suitable for manual throwing. The disadvantage is that the payload is low due to the limited volume and weight. However, the use of large-caliber fire extinguishing bombs can effectively increase the payload and improve the fire extinguishing efficiency

Because the traditional launch method uses a single drug chamber to ignite the gunpowder to push the fire extinguishing bomb forward, and the pressure of the gunpowder gas behind the bomb is linearly distributed due to the expansion of the volume of the fire extinguishing bomb during the movement of the fire extinguishing bomb. The initial velocity of the projectile depends on the pressure at the bottom of the projectile, and the safety of launching depends on the pressure at the bottom of the chamber; due to the large mass of the fire extinguishing projectile, sufficient charge is needed to ensure that the fire extinguishing projectile has a certain initial velocity in order to achieve a longer distance. A larger charge mass will lead to too high pressure at the bottom of the launch tube, which will endanger the safety of launch; while reducing the charge amount will not be able to effectively promote the accelerated movement of the fire extinguishing bomb, which cannot meet the design requirements

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