Piezoelectric precision spraying device

Abstract

The invention discloses a piezoelectric precision spraying device. A driving main body comprises piezoelectric ceramic and a lever amplifying mechanism which are connected with each other; the lever amplifying mechanism amplifies micro-displacement generated by stretching and retracting of the piezoelectric ceramic under the action of an electric field to a specified stroke. The driving main bodyalso comprises a flow channel carrier, and a cavity seat is arranged in the flow channel carrier; a liquid cavity and an air cavity are formed in the cavity seat, and the liquid cavity and the air cavity are respectively communicated with a liquid flow channel and an air flow channel which are formed in the flow channel carrier; the lever amplifying mechanism is connected with a push rod, the pushrod extends into the liquid cavity, and the bottom of the liquid cavity is communicated with a nozzle. The aim of the invention is to provide the piezoelectric precision spraying device which is simple in structure, low in use cost, low in installation and adjustment difficulty and high in spraying precision.

Description

technical field [0001] The present invention relates to a spraying device for spraying liquid or other fluids from two or more sources, such as spraying liquid and air, and more particularly to a piezoelectric precision spraying device. Background technique [0002] Ultrasonic spraying uses the atomization function generated by ultrasonic vibration in the liquid to atomize the liquid flowing through the front end of the ultrasonic transducer to produce micron-sized fine droplets, and then add compressed gas of appropriate pressure to make the mist particles more dense under the action of airflow. Small and uniform, and at the same time guide the direction of the mist particles, increase the power of the atomized particles, so as to achieve the purpose of precise spraying on the surface of the object to be coated. [0003] The existing ultrasonic spraying technology has the following disadvantages: [0004] 1. The liquid needs to be atomized into micron-sized fine droplets, ...

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Problems solved by technology

[0004] 1. The liquid needs to be atomized into micron-sized fine droplets, so it is generally suitable for liquids with low viscosity or liquid-solid mixtures (the liquid is mixed with an appropriate amount of tiny particles), and for liquids with high viscosity or solid-liquid mixtures If the liquid is mixed with an appropriate amount of tiny particles, it cannot be fully atomized, and the applicability of the product is low.

[0005] 2. Generally, the higher the ultrasonic vibration frequency, the smaller the atomized particles, but the lower the electrical power, the smaller the atomized amount correspondingly, and it is impossible to ensure the stability of the atomized amount while atomizing the particles. When the atomized particles are smaller Under the working conditions, the production efficiency is low

[0007] 4. In ultrasonic spraying, the ultrasonic transducer works at the resonant frequency or a certain frequency point near the resonant frequency. For liquids of different viscosities or concentrations to be sprayed, the load characteristics of the ultrasonic transducer will change, resulting in energy conversion The resonant frequency point of the device itself will drift and change, which will have an adverse effect on ultra-precision spraying

[0008] 5. In order to improve the spraying accuracy of ultrasonic transducer spraying, the liquid to be sprayed will first pass through the precision flow pump during use, so that the fluid is distributed with high precision and then enters the working section of the ultrasonic transducer to complete the atomization spraying, further increasing the use The use cost of ultrasonic transducer to realize ultrasonic atomization

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