Low-frequency ultrasonic atomizing cultivator

Abstract

The invention belongs to cultivation apparatus of the field of agricultural engineering, which comprises an ultrasonic atomizer which is an atomizing spray cap, a power pump, a nutrient solution tank, a solution feeding conduit, a reflux conduit, a glass groove, a planting plate and the like, wherein the atomizing spray cap comprises two couples of piezo-electricity discs which are clamped inside a metallic titanium shell, the four pressed piezo-electricity discs act as one pole of high-frequency electric source input, the metallic shell acts as the other pole, an atomizing face is arranged at the opening of a muzzle, a metallic ball which is used to adjust suspending clearance is arranged on the atomizing face, the structure of the atomizing face is a double curved surface, a flow passage extends to the atomizing face, and the diameter of the metallic ball is 4-79mm. The length of the muzzle of the atomizing spray cap is equal to the wave length of a compression wave, and the vibration amplitude of the outlet of the muzzle is equal to plural micrometers. The invention adjusts the size of nutrient solution droplets by changing the clearance between the ball and the radiating surface of a focusing ultrasonic transducer. The invention is simple in structure, high in reliability, low in production costs and able to realize high power to further realize large atomizing quantity.

Description

Technical field: [0001] The invention belongs to cultivation equipment in the field of agricultural engineering, in particular to a low-frequency ultrasonic atomization cultivation device. Background technique: [0002] Aerosol cultivation is a new mode in soilless cultivation technology. Aeroponics is a cultivation mode in which the roots of plants are completely placed in an aerosol environment formed by nutrient solution for growth and development. It meets the needs of plant roots for water and fertilizer through atomized water vapor, and obtains the most sufficient oxygen. The root system grows in this environment without any mechanical resistance, so the root system can stretch freely. It has the characteristics of faster growth, more convenient management and less labor investment than any other farming method, and it will become an important cultivation method in future agricultural production. [0003] As the core device of aerosol cultivation, the performance of...

AI Technical Summary

Problems solved by technology

Because the transducer structure of this type of atomizer is a sheet, it is difficult to achieve high power, thus limiting its atomization volume

To increase the amount of atomization, the number of atomizers must be increased, and the cost will increase significantly

[0006] 2. The reliability of the ultrasonic transducer is poor

Because the structure of the transducer is a thin metal sheet, and it works in a high-frequency vibration state for a long time, it is very easy to cause fatigue fracture

[0007] 3. The droplet size cannot be adjusted, which is not conducive to the study of the relationship between root growth and nutrient droplet size

[0010] 4. Difficult to produce ultra-fine droplets

According to the theoretical calculation results, to produce droplets with a particle size of 1 micron, the thickness of the transducer is 0.3mm. Obviously, this thickness has a big problem in terms of manufacturing and strength reliability.

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