SK283606B6 - Process for increasing the injection of continuous pressurised beam - Google Patents

Abstract

The method for increasing the injection of continuous pressurised beam enables to transport the aerosol in larger distances, particularly in fire fighting and spraying the chemicals in agriculture. The idea of decreasing the friction of exiting micro-drops into the surrounding atmosphere is used, thereby the micro-drops of aerosol are coated by quickly moving driving-carrying stream of gas or gases, the friction of which against the gases in the atmosphere is smaller than the friction of the micro-drop against the atmosphere. The device using method according to the patent, consists of the accelerating chamber (4), which falls into the exit part (1), whilst their axes are identical. The stream of aerosol (6) enters the accelerating chamber (4) radially and it is accelerated by the gas stream (8), which enters axially.

Description

The invention relates to a method for increasing the spray of an aerosol beam used in fire extinguishing equipment and in spraying equipment for chemical spraying in agriculture. The method may also be used in other devices that need to deliver the aerosol over a longer distance.

BACKGROUND OF THE INVENTION

To deliver a continuous aerosol beam to the atmosphere, processes are used to achieve high output velocities of the aerosol stream from the accelerator nozzle by using high liquid pressures. According to these methods, spray nozzles inject liquid droplets axially into an accelerating nozzle with the suction of atmospheric air.

A disadvantage of these processes is that the fluid droplet enters a relatively non-moving atmospheric environment at high speed. The surface of the microdrop is inhibited by a force that is non-linearly dependent on the difference in velocity vectors of the exiting microdrop from the nozzle and the velocity vector of the moving gases of the ambient atmosphere and the adhesion forces of the atmospheric gases against the liquid droplet. This implies the following limitation.

The higher the output microdrop velocity, the higher the liquid pressure. The higher the difference between the micro-droplet velocity vectors and the surrounding atmosphere, the greater the frictional force that brakes the micro-drop. Greater frictional force will shorten the range, and at the same time, the micro-droplet will be supplied with more heat generated by the friction of the droplet surface in the atmosphere, which in the extreme case may cause it to evaporate.

SUMMARY OF THE INVENTION

The drawbacks of the prior art eliminate the method of increasing the spray of the continuous aerosol beam of the invention, using an acceleration chamber and a nozzle to accelerate and shape the output aerosol beam to align the aerosol beam velocity vector with the gas entrainment velocity vector. The essence of this method is based on the fact that the carrier gas stream and the aerosol stream enter the acceleration chamber, wherein the inlet velocity of the entraining gas stream is at least ten times higher than the inlet velocity of the aerosol stream. The aerosol beam emerging from the acceleration chamber is then accelerated and shaped in an outlet portion axially identical to the acceleration chamber. The aerosol stream exiting the acceleration chamber is at the same time the aerosol stream entering the outlet portion.

It is preferred that the aerosol stream is supplied radially and the gas stream axially.

By the method of the invention, the liquid droplets are ejected from the nozzle together with the entrainment gas at high velocity. In this way, the frictional force depends on the difference in the velocity vectors of the exiting entrainment gases that encircle the microdroplets and the velocity vector surrounding the atmosphere and on the frictional forces.

This friction is always less than the friction between the microdrop and the surrounding atmospheric gas. It is advantageous to use gas mixtures and gases with symmetrical and stable molecules as entraining gas. The entraining gas determines the use of the device. Atmospheric air is also suitable for elementary use.

The advantage of this method is the possibility to use low media pressures and a large range of continuous aerosol beam.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained in more detail with reference to the drawings, in which:

FIG. 1 shows a longitudinal section of a device using the method according to the invention, and FIG. 2 is a longitudinal section through the device structurally derived from FIG. 1 by an inverse procedure.

DETAILED DESCRIPTION OF THE INVENTION

The device for increasing the spray of a continuous aerosol beam by the method according to the invention in FIG. 1 consists of an acceleration chamber 4, the outlet of which is an outlet part 1, the axes of which are identical. In the center of the outlet part 1 is a homogenization chamber 7. The aerosol is fed to the acceleration chamber 4 through a set of nozzles 3 which are drilled radially in the housing of the cylindrical chamber for the aerosol inlet 6. The acceleration chamber 4 is connected to the gas inlet channel 8. the gas 8 is conical at the entrance to the acceleration chamber 4, and in this space there is an axially displaceable conical body 5, which regulates the quantity and velocity of the gas entering the acceleration chamber 4. The outer casing 2 of the acceleration chamber 4 is cylindrical and surrounds either the acceleration chamber 4, or in the design of FIG. 2 the aerosol supply chamber 6.

Industrial usability

The process according to the invention can be used wherever the aerosol needs to be transported over a longer distance. This is particularly beneficial in fire extinguishing technology, spraying in agriculture, as well as in military technology.

Claims (2)

A method of increasing the spray of a continuous aerosol beam utilizing accelerating the aerosol beam in an acceleration chamber and subsequently accelerating and shaping the aerosol beam in the nozzle of the outlet portion to achieve or approach the aerosol jet velocity vector with the gas velocity vector exhibiting the gas flow velocity (8) and the aerosol stream (6) is supplied to the acceleration chamber (4), wherein the inlet velocity of the entraining gas stream (8) is at least ten times higher than the inlet velocity of the aerosol stream (6) and the aerosol beam exiting the acceleration chamber (4) is subsequently accelerated and shaped in the outlet portion (1) axially identical to the acceleration chamber (4), wherein the aerosol stream exiting from the acceleration chamber (4) is simultaneously the aerosol stream entering the outlet portion (1). Method of increasing the spray of a continuous aerosol beam according to claim 1, characterized in that the acceleration chamber (4) is supplied with an aerosol stream (6) radially and accelerated by a gas stream (8) supplied axially.