A water-return-proof water cutting nozzle

Abstract

The invention discloses a water cutting nozzle with an anti-water-return function. The water cutting nozzle comprises a cutting head body, an ejection abrasive channel, a water nozzle assembly, an abrasive nozzle, and an abrasive and sand mixing cavity, wherein the abrasive and sand mixing cavity is formed in the inner hole, between the water nozzle assembly and the abrasive nozzle, of the cutting head body; the water nozzle assembly and the abrasive nozzle are respectively fixed at the upper and lower ends of the central line of the cutting head body; the water nozzle assembly is positioned in the vertical high-pressure water inlet of the cutting head body; the abrasive nozzle is in force fit with the cutting head body, and fixed with the cutting head body through a coupling nut; the water nozzle assembly is also in force fit with the cutting head body; the abrasive and mixing cavity is defined by a vertical positioning cylinder of a single diameter, and the vertical positioning cylinder is arranged in the inner hole of the cutting head body; the water nozzle assembly and the abrasive nozzle are respectively mounted through the upper and lower ends of the vertical positioning cylinder which are regarded as an upper positioning hole and a lower positioning hole, so that the central lines of the water nozzle assembly and the abrasive nozzle can coincide with that of the vertical positioning cylinder; and an injection channel is additionally arranged on the opposite side of the ejection abrasive channel where vacuum ejection is formed by supersonic jet flow. The water cutting nozzle provided by the invention is simple in structure, stable in jet flow, reliable in running, and excellent in anti-water-return performance.

Description

technical field [0001] The invention belongs to the technical field of water-jet cutting, and in particular relates to a water-backwater-preventing nozzle for water cutting. Background technique [0002] As a cold cutting process of metal and non-metal sheet, water cutting must meet two basic conditions: ultra-high pressure (pressure is usually 250-500MPa) and abrasive water jet (usually garnet is used as abrasive); and abrasive water jet It is also necessary to ensure that the abrasives are dry, uniform and continuous before mixing. The traditional water cutting nozzle uses the water nozzle to generate 3 times the supersonic water jet to form a vacuum to inject the abrasive, mix it in the mixing chamber and then form the abrasive water jet from the abrasive nozzle, but due to the inertia of the jet opening and closing, it will flow from the mixing chamber to the The sand supply pipe produces backflow (also called return water), because the backwater will wet and block the ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, such as Chinese patent document CN 2759688Y discloses a water jetting machine anti-backwater sand control valve, but the problem still exists, because the action of the valve always lags behind the inertia of the jet, and the work and stability are poor, and the return Water cannot be eliminated; Chinese patent document CN 1413807A discloses a water cutting machine return water control system, but there are many parts, complex shapes and high manufacturing costs

The existence of the above problems has seriously affected the normal performance of the whole machine, and the sand supply failure is often caused by the backwater, resulting in unnecessary shutdown and sand cleaning, resulting in unnecessary losses for users

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