RU2283152C2 - Spraying device adapted to spray liquid in gaseous medium to create gas-drop jet having high kinetic energy - Google Patents

Abstract

FIELD: liquid spraying equipment, particularly adapted to spray desirably quantity of liquid during short time period to create gas-droplet jet having high kinetic energy and used, for instance, in fire-fighting.

SUBSTANCE: spraying device comprises outlet gas-liquid nozzle 1 communicated with mixing chamber, which mixes gas and liquid 2 so that outlet mixing chamber orifice is aligned with inlet orifice of outlet nozzle orifice and mixing chamber is connected with liquid vessel and compressed gas cylinder via pipelines. Outlet end of gas pipeline 4 is made as gas-dynamic nozzle 3. Gas pipeline 3 is coaxially arranged inside liquid pipeline 5. Outlet orifice of liquid pipeline forms inlet orifice of mixing chamber, which is coaxial to outlet orifice of the chamber and to gas-dynamic nozzle. Valve 9 having low dynamic resistance is installed between outlet and outlet orifices of the mixing chamber and provides simultaneous opening and closing of liquid and gas pipelines when pressure is applied to triggering device bail.

EFFECT: increased operational efficiency, simplified structure and improved reliability.

1 dwg

Description

The invention relates to techniques for spraying liquids in a gaseous medium, preferably in air, and can be used to spray a significant amount of liquid in a short period of time with the formation of a gas-droplet jet with high kinetic energy, in particular for fire fighting purposes.

The objective of the invention is to increase the efficiency, simplify the design and increase the reliability of the device for producing a gas-droplet jet according to the patent US 6478240, containing a gas-liquid nozzle connected to the gas-liquid mixing chamber in such a way that the outlet of the mixing chamber coincides with the inlet of the gas-liquid nozzle, and the chamber mixing is connected by highways with tanks for liquid and compressed gas through controlled poppet type valves, which when actuating the device, separate opening of the lines for gas and liquid, the mixing chamber includes a cylindrical nozzle with tangential openings for injecting liquid.

However, the device according to patent US 6478240 has the following disadvantages:

1. The insufficient velocity of the gas stream when it enters the mixing chamber due to the lack of a gas-dynamic nozzle.

2. Insufficient gas-droplet jet velocity due to inhibition of gas and liquid flows by poppet valves and due to injection of liquid into the mixing chamber in a direction tangential to the gas flow.

3. Inadequate spraying efficiency due to a decrease in the liquid content in the gas-droplet stream during separate opening / closing of the gas and liquid flow.

4. The complexity of the design of the device due to the presence of controlled valves, nozzles for injecting liquid and a gas high-pressure gas line.

The objective of the invention is to increase the efficiency, simplify the design and increase the reliability of the device for producing a gas-droplet jet according to the patent US 6478240, as a result of the presence of a gas-dynamic nozzle at the inlet of the gas main into the mixing chamber, the absence of poppet valves, the supply of liquid and gas to the mixing chamber by coaxial flows directed coaxial to the gas-liquid nozzle to its inlet, the location of the gas line coaxially inside the liquid line, simultaneous opening / closing ytiem valve gas and liquid line of the low dynamic resistance, located inside the mixing chamber.

The objective is achieved in that a device for producing a gas-droplet jet containing an outlet gas-liquid nozzle connected to a gas and liquid mixing chamber in such a way that the outlet of the mixing chamber coincides with the inlet of the gas-liquid nozzle and the mixing chamber is connected by lines to liquid and compressed containers gas, according to the invention, the output end of the gas line is made in the form of a gas-dynamic nozzle and the gas line is located coaxially inside the liquid trawl, the outlet of the liquid line forms the inlet of the mixing chamber located coaxially with the outlet of the chamber and the gas-liquid nozzle, and the valve is installed between the inlet and outlet openings of the mixing chamber and provides simultaneous opening / closing of both the liquid and gas lines.

The essence of the claimed device is illustrated in the drawing (see drawing).

The main components of the device: exhaust gas-liquid nozzle (1) to obtain a gas-droplet jet with high kinetic energy; a chamber (2) for mixing gas and liquid; gas-dynamic nozzle (3) for accelerating the gas flow to supersonic speed; gas line (4) for supplying gas under pressure to the gas-dynamic nozzle; a fluid line (5) for supplying liquid to the mixing chamber; handle (6) to hold the device; starting bracket (7) for actuating the device; a spring (8) to return the valve to its original position; valve (9) for simultaneous opening / closing of both the liquid and gas lines.

Description of the operation of the device.

After filling the gas (4) and liquid lines (5) from a source of compressed gas and liquid, the starting bracket (7) is pressed which according to the invention, compressing the spring (8), pushes the valve (9), which simultaneously opens the gas and liquid lines, output the openings of which are the inlet openings of the mixing chamber (2) and are located coaxially with the outlet gas-liquid nozzle (1); compressed gas passing through the gas-dynamic nozzle (3) forms a supersonic flow, which effectively disperses the liquid entering coaxially with it into the mixing chamber. The gas-droplet jet formed as a result of mixing the supersonic gas stream with the liquid stream is additionally accelerated through the gas-liquid nozzle (1), forming a gas-droplet stream with high kinetic energy, which is guided in the right direction by the handle (6), while releasing the trigger guard, the valve is simultaneously closes the liquid and gas lines and the device stops working.

As was shown, the proposed invention provides an increase in the efficiency of the device for spraying liquid in a gaseous medium as a result of: increasing the speed and dispersion of droplets of a sprayed liquid when interacting with it in a supersonic gas stream produced by a gas-dynamic nozzle; increasing the speed of gas and liquid flows due to the lack of poppet valves and due to the supply of liquid and gas to the mixing chamber by coaxial flows directed coaxially with the gas-liquid nozzle to its inlet; simultaneous opening / closing of the gas and liquid lines with a valve with low dynamic resistance located inside the mixing chamber. The proposed invention provides a simplification of the design and an increase in the reliability of the device as a result of the absence of: controlled poppet valves, nozzles for injecting liquid and a high-pressure gas line.

Claims (1)

A device for spraying liquid in a gaseous medium with the formation of a gas-droplet jet with high kinetic energy, comprising a gas-liquid outlet nozzle connected to a gas and liquid mixing chamber such that the outlet of the mixing chamber coincides with the inlet of the gas-liquid outlet and the mixing chamber is connected to containers for liquid and compressed gas, characterized in that the output end of the gas line is made in the form of a gas-dynamic nozzle and a gas line laid coaxially inside the liquid line, the outlet of the liquid line forms the inlet of the mixing chamber located coaxially with the outlet of the chamber and the gas-liquid nozzle, and a valve with low dynamic resistance is installed between the inlet and outlet openings of the mixing chamber and provides simultaneous opening / closing of both the liquid and gas main.