Low-frequency ultrasonic atomizing spray nozzle with large atomization amount

Abstract

The invention relates to an ultrasonic atomizer, in particular to a low-frequency ultrasonic atomizing spray nozzle with a large atomization amount for atomizing cultivation in the field of agricultural engineering. Atomizing end surfaces are symmetrically fixed on the two sides of the front end of an amplitude transformer of the low-frequency ultrasonic atomizing spray nozzle with the large atomization amount, wherein the atomizing end surfaces are spherical nick-shaped end surfaces; the thicknesses d of the spherical nick-shaped end surfaces are (1 / 12-1 / 10)R, wherein R is the radius of a front end cover; and the central angles beta of the spherical nick-shaped end surfaces are larger than 90 degrees, but smaller than 120 degrees. The two symmetrically distributed spherical nick-shaped atomizing end surfaces are used and the area S of each atomizing end surface is about 90 / PibetaRd, so that the atomization amount and the efficiency of the atomizer are greatly improved.

Description

technical field [0001] The invention relates to an ultrasonic atomizer, in particular to a low-frequency ultrasonic atomizing nozzle with a large atomization amount for atomization cultivation in the field of agricultural engineering. Background technique [0002] Atomized cultivation is also called atomized cultivation or atomized tillage. It is a new type of cultivation mode that allows the roots of plants to leave the substrate and water and grow and develop completely in an aerosol environment. In atomized cultivation, the roots of crops are suspended in the air and oxygen The supply can be maximized, water and fertilizer are provided through atomization, the absorption of mineral ions and water can be fully guaranteed, and the root system is in the best water, air and fertilizer environment, so that the crops can maximize their growth potential. [0003] Compared with traditional atomizers (such as air-water ejectors, centrifugal sprayers and low-pressure nozzles), ultr...

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Problems solved by technology

[0004] (1) The nozzle structure is a sheet transducer, which is difficult to achieve high power;

[0005] (2) The particle size spectrum of the generated nutrient solution droplets is too narrow to meet the nutrient absorption requirements of different plant roots;

[0006] (3) The atomization performance is greatly affected by the viscosity of the nutrient solution; when the viscosity of the nutrient solution is high, the vibration damping of the sheet transducer increases, which seriously affects its atomization effect;

[0007] (4) Poor reliability; because the structure of the nozzle is a thin metal sheet, and it works in a high-frequency vibration state for a long time, it is easy to cause fatigue fracture

[0008] Compared with high-frequency ultrasonic nebulizers, low-frequency ultrasonic nebulizers (working frequency between 20K and 100K Hz) produce droplets with a wide particle size spectrum, which enables them to produce ultra-fine nutrient droplets suitable for root growth. However, because the atomization method of the longitudinal vibration transducer is single-end atomization, it is impossible to achieve a large amount of atomization

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