Micro water fog spray nozzle based on bubble atomization

Abstract

The invention discloses a micro water fog spray nozzle based on bubble atomization. The micro water fog spray nozzle is characterized in that an air filling tube in the micro water fog spray nozzle is in threaded connection with a mixing cavity, so that the distance between each air filling hole and each spray hole can be adjusted; 2-3 rows of air filling holes are formed in the side surface of the air filling tube and 4-7 air filling holes are formed in the bottom of the air filling tube; each row of air filling holes in the side surface of the air filling tube are uniformly distributed on the circumference on which the cross section of the air filling tube is arranged and the air filling holes in the bottom of the air filling tube are also uniformly distributed along the circumference; the distances between the rows of air filling holes in the side surface of the air filling tube are the same and each air filling hole is downwardly tilted at an angle of 40-50 degrees; a spray hole is formed in the center of the bottom surface of the spray nozzle. Compared with a conventional fine water fog spray nozzle, the micro water fog spray nozzle has the advantages of small working pressure, less required atomizing air, larger spray-hole diameter, good atomizing effect, applicability to firefighting field, high extinguishing effectiveness and the like.

Description

Technical field [0001] The invention belongs to the technical field of micro-water mist nozzles for fire extinguishing, and particularly relates to a micro-water mist nozzle for fire extinguishing, spray cooling and decontamination based on bubble atomization. Background technique [0002] According to the doctoral dissertation of the University of Science and Technology of China "Pneumatic water mist generation method based on steam-assisted atomization and simulation experiment of fire extinguishing effectiveness" (Xiao Xiukun, 2011), the existing water mist nozzles mainly include single-fluid nozzles and dual-fluid nozzles. Two kinds of fluid nozzles. Single-fluid water mist nozzles are mainly pressure type and impact type atomization nozzles, which are widely used at present. Impact type atomization nozzles generally operate at low and medium pressure, but are affected by the size and shape of the metal impact head. The particle size of the fine water mist is relatively larg...

AI Technical Summary

Problems solved by technology

Single-fluid fine water mist nozzles are mainly pressure type and impact type atomizing nozzles, which are widely used at present. Impact type atomizing nozzles generally operate at low and medium pressures, but are affected by the size and shape of the metal impacting head. The particle size of the fine water mist is relatively large, generally the 2nd and 3rd grade fine water mist; the pressure-type atomizing nozzle pressurizes the liquid to make the water flow out at a high speed from the nozzle with a small aperture, to produce small particle size Mist droplets (first-level fine water mist) require high working pressure, generally greater than 10MPa, which greatly increases the cost of the system, and the diameter of the nozzle hole needs to be small enough, generally less than 1 mm, so it is prone to blockage

The traditional two-fluid fine water mist nozzle uses the shearing effect of compressed gas on water to form fine water mist. The working pressure of water and compressed gas is between 0.3 and 0.7 MPa. Water mist, but because the structure of this type of nozzle is relatively complex, and the liquid must be atomized by the high-speed flow of aerodynamic force, the air consumption is large, so this type of nozzle is rarely used in actual fire protection engineering

[0003] Bubble atomizing nozzle is a new type of two-fluid atomizing nozzle, which has been widely used in spray combustion of internal combustion engines, gas turbines, industrial boilers, waste liquid incinerators, etc., but it is rarely used in the field of fire fighting, such as Chinese Patent Publication No. CN2211543Y A disclosed "bubble atomizing nozzle" uses a ring-shaped outlet to spray out, and the droplets are distributed in a hollow cone shape. At the same time, the liquid and gas inlets enter the nozzle from the same direction. The gas has a small momentum, and the bubbles formed in the liquid are two Insufficient phase flow power, resulting in insufficient spray intensity, not suitable for fire extinguishing and spray cooling fields

There are few existing bubble atomization fine water mist nozzles. For example, a "bubble atomization fine water mist nozzle" disclosed in Chinese Patent Publication No. CN201921369U adopts the form of external air and internal liquid. , a swirl core is added at one end of the porous inner tube, which increases the manufacturing cost and causes a complex structure; since the axis of the gas injection hole on the porous inner tube is perpendicular to the axis of the porous inner tube, the process of gas entering the porous inner tube from the annular cavity To overcome a large liquid pressure, which weakens the quality of the bubble atomization

The micro-water mist nozzles that use the bubble atomization technology alone in the field of fire extinguishing technology have not yet been reported.

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