Solid particle group accelerating device for shock tube-Laval nozzle

Abstract

The invention discloses a shock wave tube-Laval nozzle accelerating device of a solid particle group. A compressed gas source is connected with a high pressure gas chamber of a shock wave tube by a compressed gas check valve, a powder storage chamber is surrounded by tube walls and movable clapboards at the two ends of the powder storage chamber, one of the movable clapboard separates a low pressure air chamber and the powder storage chamber and the other moveable clapboard separates the powder storage chamber and the Laval nozzle; a particle injection hole is cut on the side wall of the powder storage chamber to be connected with a powder supply source; a powder supply switch valve is arranged in the particle injection hole to separate the powder supply source and the powder particle in the powder storage chamber; a control circuit board is respectively connected with a transient switch valve, the powder supply switch valve and the two movable clapboards. As a chemical powder extinguisher, since the shock wave tube and the Laval nozzle function synchronously to accelerate the solid particle group to cause the shooting range of extinguisher to be sufficiently far off and an ejection covering area can be appropriately enlarged by enlarging the expansion angle of the gradual-widening section of the Laval nozzle, the shock wave tube-Laval nozzle accelerating device has high extinguishing efficiency, good effect, long shooting range and energy conservation; as an ultrasonic cool spraying device, the particle adhesive strength and the coating strength are great.

Description

technical field [0001] The invention relates to an accelerated transportation device for solid powder particles, in particular to a shock tube-Laval nozzle solid particle group acceleration device. Background technique [0002] The shock tube is one of the generators of moving shock waves and supersonic airflow. Laval nozzles can also generate supersonic gas phase flow. It is undoubtedly a very effective means to use the high-speed airflow generated by them to entrain and accelerate solid particles. It can also be realized in practical applications in many fields. The method of connecting the shock tube and the Laval nozzle in series to simultaneously exert the function of accelerating the transport of solid particle groups has not been reported in the Chinese patent database. For example, the "shock wave sand and gravel fire extinguishing gun" proposed in Chinese patent 200710016058.5 and the "Laval nozzle for cold spraying" proposed in Chinese patent 200710016442.5 only u...

AI Technical Summary

Problems solved by technology

In the existing technology, the ability to accelerate the solid particle group by using a single shock tube or Laval nozzle is relatively limited, and it is difficult to make the solid particle group reach the required fairly high injection velocity

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