A high and low pressure internal and external hybrid air atomizing nozzle

Abstract

The invention discloses a high-low pressure internal and external mixed air atomizing nozzle. The water flow enters through the water inlet hole, and the water flow rotates at a high speed after passing through the rotary core, and then enters the atomization chamber through a diameter-changing structure, and the gas sprayed out from the low-pressure through hole When they meet, they are impacted and crushed to form a steam-water mixture, which completes the first atomization; the steam-water mixture entering the nozzle core is sprayed out together with the gas from the low-pressure nozzle channel, and meets air at the outlet to complete the second atomization; the high-pressure nozzle channel The sprayed water mist is subjected to high-pressure impact crushing and atomization, and the third atomization is completed. After three atomizations, the low-pressure air supply of 0.3MPa~0.5MPa is fully utilized to first shear and crush the water flow, and then effectively use 1MPa~1.5MPa The high-pressure air supply further reduces the particle size and increases the atomization angle, and finally forms an ultra-fine water mist with an average particle size of less than 20 μm, an atomization angle of 115°-135°, and an effective range of 7m-10m.

Description

technical field [0001] The invention relates to an atomizing nozzle, in particular to a high-low pressure internal and external mixing air atomizing nozzle capable of generating ultra-fine water mist and suitable for spraying dust in coal mines. Background technique [0002] At present, in the absence of dust-proof measures in the mining face of my country's coal mines, the dust concentration of the fully mechanized excavation face can reach 2500mg / m 3 ~3000mg / m 3 , and the situation of dust in fully mechanized caving work is even more serious. When shearers are working in parallel to cut coal, move racks and put coal in parallel, the instantaneous original total dust concentration of some coal mines is even as high as 8000mg / m 3 ~10000mg / m 3 . In order to reduce the dust concentration on the working face, reduce the harm of dust to workers and equipment, and avoid dust explosion accidents, most coal mines in China have adopted spray dust suppression technology. [0003]...

AI Technical Summary

Problems solved by technology

In fully mechanized mining or fully mechanized excavation working faces, the particle size of coal dust or rock dust below 7.07 μm is the most harmful to the human body, and the particle size of the droplets produced by the commonly used spray nozzles is generally greater than 100 μm. The field concentration is small and the dust cannot be effectively suppressed

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