Ultrahigh-pressure abrasive jet generating device based on ejector mechanism

Abstract

The invention discloses an ultrahigh-pressure abrasive jet generating device based on an ejector mechanism. The ultrahigh-pressure abrasive jet generating device comprises an air supplementing type dry sand tank, a front mixed abrasive generating device and a numerical control machine tool, and further comprises an ejector secondary sand mixing tube, the ejector secondary sand mixing tube comprises an ejector tube body and a main output tube body, an ejector cavity is formed in the ejector tube body, a conical end opening is formed in the end of the main output tube body, and the conical end opening is positioned in the ejector cavity; and dry sand suction passages are symmetrically arranged on the periphery of the ejector cavity, a horn-shaped throttling cavity is formed in the right endof the ejector cavity, a wide-opening divergent cavity is formed in the right end of the horn-shaped throttling cavity, a straight tube turbulence cavity is formed in the right end of the wide-openingdivergent cavity, and a turbulence column is arranged in the straight tube turbulence cavity. According to the ultrahigh-pressure abrasive jet generating device based on the ejector mechanism, the negative pressure vacuum state can be formed in the ejector cavity, and entrainment and suction can be achieved on dry sand, so that the abrasive concentration of an original abrasive jet is supplemented, the striking force of the abrasive jet is increased, and the cutting function on a material with the non-uniform longitudinal size is realized.

Description

technical field [0001] The invention relates to the technical field of abrasive water jet mechanical equipment design, in particular to an ultra-high pressure abrasive jet generating device based on an ejection mechanism. Background technique [0002] The water jet is a high-speed water stream of different shapes formed by the nozzle, and the flow rate of the jet depends on the pressure drop before and after the nozzle outlet section. Water jetting is the simplest form of energy transformation and application. Usually, the power-driven pump completes a suction and discharge process of water, pumps a certain amount of water to the high-pressure pipeline, and makes it reach the nozzle with a certain amount of energy. The hole diameter of the nozzle is required to be much smaller than that of the high-pressure pipeline, so this certain amount of water reaching the nozzle must be accelerated if it wants to flow out of the nozzle hole. In this way, the water that accelerates co...

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Problems solved by technology

[0003] However, the existing ultra-high pressure abrasive jet generator based on the ejection mechanism cannot realize the function of compensating cutting of materials with different longitudinal dimensions, and cannot form a negative pressure vacuum state in the ejection cavity to entrain and suck dry sand. Supplementing the abrasive concentration of the original abrasive jet cannot improve the impact force of the abrasive jet, and it is difficult to avoid the "impermeable cutting" of materials with local longitudinal dimensions caused by insufficient jet energy, and the cutting function of materials with different longitudinal dimensions cannot be realized Some ultra-high pressure abrasive jet generators based on the ejection mechanism cannot realize the acceleration of the abrasive jet output by the pre-mixed abrasive jet generator at the conical port to form a jet, and some ultra-high pressure abrasive jet generators based on the ejection mechanism cannot suck dry sand into the The negative pressure vacuum area in the injection cavity cannot accelerate the abrasive mixed liquid after injection, and the ultra-high pressure abrasive jet generator based on the injection mechanism cannot increase the dry sand sucked by the injection and the output of the main output pipe. The secondary mixing effect of the abrasive mixed liquid cannot increase the degree of turbulence of the mixed fluid in the straight pipe turbulent flow chamber, it is difficult to increase the turbulent effect, the uniformity of the concentration of the mixed fluid cannot be improved, and it cannot meet the needs of the actual situation

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