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Single drop electrostatic spraying system stable work regulation method

An electrostatic spraying and system stabilization technology, which is applied in spraying devices, spray discharge devices, liquid supply devices, etc., can solve problems such as droplet instability, achieve consistent shapes, and meet the effects of high-precision scientific research experiments

Inactive Publication Date: 2018-05-15
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] However, usually in the process of electrostatic droplet generation, the average flow rate of droplet formation and supply flow Q s Mismatch, resulting in an unstable state of droplet generation, with both droplet generation frequency and individual droplet volume changing over time

Method used

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  • Single drop electrostatic spraying system stable work regulation method
  • Single drop electrostatic spraying system stable work regulation method
  • Single drop electrostatic spraying system stable work regulation method

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Embodiment Construction

[0020] Such as figure 2 As shown, the system is mainly composed of drive motor 1, injector 2, nozzle 3, nozzle holder 4, droplet collector 5, laser 6, lens 7, photomultiplier tube 8, linear array CCD 9, analog-to-digital converter ADC 10, Composed of FPGA 11 and high voltage power supply 12. An adjustment and control device is added to the electrostatic droplet spraying device, which consists of six parts: laser 6, lens 7, photomultiplier tube 8, linear array CCD 9, analog-to-digital converter ADC 10 and FPGA 11. The laser beam emitted by the laser 6 is in the same horizontal plane as the lens 7 , the photomultiplier tube 8 and the linear array CCD 9 , and is located 1 cm below the nozzle 3 . Lens 7 and photomultiplier tube 8 are respectively placed at 10cm and 20cm away from the vertical direction of nozzle 3, and form a certain angle (for example, 45 degree angle) with light beam in horizontal direction; An included angular orientation (for example, a 45-degree angle). T...

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Abstract

The invention discloses a single drop electrostatic spraying system stable work regulation method and belongs to the technical field of electrostatic drop generation. A single drop electrostatic spraying system can monitor a moment t and a single drop volume V when a drop enters a laser beam irradiation range in real time and estimates a drop jetting average flow rate which is shown in the following description as a set reference value of an actual liquid supply flow rate Qs. By adopting the method, a photomultiplier is used as a starting circuit of a regulation and control device, when dripping drops enter the laser beam irradiation range, the light scattering phenomenon occurs, the photomultiplier converts a collected optical pulse signal to an electric pulse signal as a starting signalof a system; and through a photoelectric technology, the volume and the drop production time interval of the jet single drop are detected, and the drop jetting average flow rate, which is described inthe following description, is estimated as the set reference value of the actual liquid supply flow rate Qs, so that relative stability of the liquid volume at a nozzle can be realized, and thus thestability of the drop production time interval and the single drop volume is ensured.

Description

technical field [0001] The invention relates to a control system based on an electrostatic droplet generating device, and also relates to a control method for stable operation of a single droplet electrostatic spraying system, belonging to the technical field of electrostatic droplet generation. Background technique [0002] Commonly used droplet generation methods include pneumatic, piezoelectric, thermal bubble and electrostatic. Among them, the pneumatic type, the piezoelectric type and the thermal bubble type all squeeze the liquid droplets out of the nozzle by adjusting the pressure, while the electrostatic type is different from the previous methods. This method uses the electric field force to overcome the surface tension of the liquid droplets to It drips from the nozzle. Compared with the other three methods, this method not only can produce droplets much smaller than the diameter of the nozzle, but also does not clog when spraying liquid containing particles or ce...

Claims

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Application Information

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IPC IPC(8): B05B5/025B05B5/16B05B12/08
Inventor 王志海杨晓桐张海义王一玮
Owner BEIJING UNIV OF TECH
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