Monitoring device and monitoring and judging method for cavitation of venturi fertilizer injector

Abstract

The invention relates to a monitoring device and a monitoring and judging method for cavitation of a venturi fertilizer injector. The monitoring device for the cavitation of the venturi fertilizer injector is characterized by comprising a dynamic strain indicator, a monitor, a strain gauge and a pressure sensor; the strain gauge is attached on the outer surface of the venturi fertilizer injector, the strain gauge is connected with the dynamic strain indicator, the dynamic strain indicator is connected with the monitor, the monitor is further connected with the pressure sensor, and the pressure sensor is arranged at an input-output port of the venturi fertilizer injector; an input module, a storage module, a data processing module, an alarm module and a display module are pre-arranged in the monitor; the input end of the input module is connected with the output ends of the dynamic strain indicator and the pressure sensor, the output end of the input module is connected with the input end of the storage module, the output end of the storage module is connected with the input end of the data processing module, the output end of the data processing module is connected with the alarm module and the display module, and the output end of the alarm module is connected with the display module. The monitoring device and the monitoring and judging method for the cavitation of the venturi fertilizer injector has low requirements on the external environment, and is small in device size, high in sensitivity, low in experimental cost, convenient and rapid to operate, and applicable to monitoring and judging the cavitation in fluid mechanical equipment.

Description

technical field [0001] The invention relates to a monitoring device and a monitoring and judging method for monitoring cavitation of fluid flow inside a machine, in particular to a monitoring device and a monitoring and judging method for cavitation of a Venturi fertilizer applicator. Background technique [0002] Cavitation is the formation, development and collapse process of bubbles inside the fluid or on the solid-liquid interface when the local fluid pressure drops to the saturated vapor pressure of water during the fluid flow process. The mainstream view is that when the fluid pressure is low, the bubbles inside the fluid are born and will gradually develop and expand. At this time, because the bubbles continue to expand, the pressure of the surrounding fluid will increase, and the bubbles will shrink and even partially Collapse, which will generate enormous energy, and the process of expansion and contraction will repeat until the surrounding pressure becomes enough t...

AI Technical Summary

Problems solved by technology

[0005] Considering the complex working environment of the Venturi fertilizer applicator, the noise analysis technology is easily disturbed by external noise; the accelerometer measurement method requires the measured object to have a certain quality, and it is not suitable to use this method to analyze the vibration of the Venturi fertilizer applicator with a small mass; characteristics The acquisition process of the map is cumbersome, which is not conducive to actual operation; the material of the Venturi fertilizer applicator is plastic, not a transparent device, and the camera method and particle image velocimetry technology cannot be directly used

Up to now, there is no economical and effective method for monitoring and judging the cavitation in the flow inside the venturi applicator

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