High-low pressure and internal-external hybrid air atomizing nozzle

Abstract

The invention discloses a high-low pressure and internal-external hybrid air atomizing nozzle. According to the invention, the first atomization process includes the following steps: water flows enter via a water inlet, and begin to rotate at a high speed after passing by a rotation core; the water flows then enter an atomizing chamber via a variable diameter structure, encounter gas which is sprayed from a low pressure through hole, and are impacted and fragmented into a mixture of gas and water, thus completing the first atomization. A second atomization process includes steps that: the mixture of gas and water enters a nozzle core, then is sprayed out together with the gas which is sprayed out from a low pressure nozzle channel, and subsequently encounters air at an outlet, thus completing the second atomization process. A third atomization is achieved when a high pressure nozzle channel impacts the sprayed-out water mist at with a high pressure and has the water mist fragmented and atomized. The three atomization processes make full use of the gas which is supplied at a low pressure ranging from 0.3 MPa to 0.5 MPa in shearing and fragmenting the water flows, and of the gas which is supplied at a high pressure gas ranging from 1MPa to 1.5MPa in further decreasing a particle size and increasing atomizing angles, which results in the super-fine water mist with an average particle size smaller than 20 [mu]m, an atomization angle up to the range from 115 DEG to 135 DEG, and an efficient ejection range of 7-10 m.

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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