High-pressure and low-frequency autooscillation pulse gas-liquid jet nozzle

Abstract

The invention discloses a high-pressure and low-frequency autooscillation pulse gas-liquid jet nozzle capable of being applied to the fields of jet cutting, crushing, washing, mixing, pipeline delivery and the like. As an upper nozzle and a lower nozzle in the invention are both in high-precision clearance fit with a cavity body, defects, such as low coaxiality, caused by cavity length adjustment during the spiral transmission of a traditional method are avoided. In work, a connecting base capable of rotating drives the cavity body and the lower nozzle to rotate, thereby realizing continuous cavity length adjustment. When cavity length reaches a preset value, the connecting base can be fixed through tightening a cylindrical screw. At the same time, low-frequency modulation is realized on high-pressure jet through automatic gas inhalation, and accurate control over jet oscillation frequency is further finished in a low-frequency range through the combined action of gas flow and cavity length. The modulation scheme is much better than a traditional mechanical jet modulation method and can greatly improve jet impact and effective acting range.

Description

technical field [0001] The invention relates to multiple fields such as jet cleaning, rust removal, crushing, cutting and pipeline transportation, and is a frequency-adjustable high-pressure and low-frequency self-vibrating pulse gas-liquid jet nozzle. Background technique [0002] The self-oscillating pulse gas-liquid jet nozzle is a derivative structure of the self-oscillating pulse water jet nozzle. Its principle is that when the fluid passes through the upper nozzle and is ejected from the lower nozzle through the oscillation cavity at high speed, on the one hand, the device is opposite to the cavity. The fluid inside has a shearing effect, so that the continuous fluid can be transformed into an intermittent jet with higher instantaneous impact force; Vortex, when the jet impacts the surface of the test piece, it will form a strong shear stress and alternating shear stress, which will greatly enhance the efficiency of cleaning, rust removal, crushing and cutting. Therefo...

AI Technical Summary

Problems solved by technology

[0003] The cavity length has a great influence on the pulsed gas-liquid jet generator (namely, the nozzle). Only when the cavity length is appropriate, the instability of the self-excited pulsed jet shear layer will amplify the disturbance. The impact force will be enhanced, and it will have a significant effect on the cleaning, rust removal, crushing and cutting of the test piece. If the cavity length is too small, the jet flow in the cavity will not form a shear layer that can collide with the downstream wall. Therefore, it is impossible to form a self-excited oscillating pulse jet; if the cavity length is too large, a part of the energy of the self-excited oscillating pulse jet will be directly converted into sound energy, which makes it difficult for the cleaning, rust removal, crushing and cutting of the test piece. Decreased effect

[0004] However, it should be noted that so far there have been very few studies on pulsed gas-liquid jet nozzles, mostly limited to the description of the nozzle's apparent characteristics, and little research on its structure

Corresponding to jet nozzles in different fields, there are differences in the optimal cavity length

However, the cavity lengths of the currently involved nozzles are all fixed values, that is to say, a nozzle can only be used in one field.

If multiple fields such as jet cleaning, rust removal, crushing and cutting are to be realized, there must be multiple nozzles, which will greatly increase the production cost and bring a lot of unnecessary troubles to the constructors.

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