Self-excitation aspiration pulse jet nozzle

Abstract

The invention discloses a self-excitation aspiration pulse jet nozzle, which comprises a self-excitation vibrating cavity body (1), an upper nozzle (2), a collider (3), a lower nozzle (4), an aspiration hole (5), a water inlet segment (6) and a pneumatic valve (7), and is characterized in that: the aspiration hole (5) for automatic air inflow is formed on the self-excitation vibrating cavity body (1); the upper nozzle (2) is fixed at the inlet end of the self-excitation vibrating cavity body (1); and the collider (3) and the lower nozzle (4) are combined and then fixed at the outlet end of the self-excitation vibrating cavity body (1). The self-excitation aspiration pulse jet nozzle is a low-pressure large-flow self-excitation aspiration pulse jet nozzle. By combining different structure parameters, the nozzle can form pulse jet flows at different frequencies and generate different impact forces which change alternatively; compared with the prior art, the impact force is greatly improved. Thus, the nozzle can be applied to desilting of reservoirs of different water depths and particularly projects of lifting, suspending, transporting and delivering mud and sand of large-sized deep-water reservoirs.

Description

technical field [0001] The invention relates to the field of underwater dredging and cleaning, in particular to a self-excited air-breathing pulse jet nozzle for lifting and transporting bottom sediment of a deep-water reservoir. Background technique [0002] Most of the rivers in our country have high sediment content, and the built reservoirs are seriously silted, which reduces the benefits of the reservoirs and flood control, brings many problems and adverse effects, seriously affects the service life of the reservoirs, and brings huge losses to the country. Over the years, my country has made some research achievements in the method of reservoir sediment reduction and reservoir dredging technology, but these methods and technologies are mostly used in smaller reservoir dredging, and the scale of dredging is small, basically 5 million m 3 Below, and for the deposition volume of hundreds of millions m 3 Large-scale reservoirs, especially large deep-water reservoirs, are m...

AI Technical Summary

Problems solved by technology

Self-excited oscillating pulse jet nozzle is a new type of device that generates pulse jet, mainly used in industrial cutting, surface cleaning, drilling and material crushing, etc. It is used for crushing and starting of sediment deposited at the bottom of deep water reservoirs. Compared with other sediment starting technologies The efficiency is high, but due to the low air content at the bottom of the deep-water reservoir, it is difficult to suspend and transport the activated sediment for a long distance, which has a negative impact on the efficient treatment of the sediment in the deep-water reservoir

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