Negative-pressure type orifice dust catcher

Abstract

The invention relates to a negative-pressure type orifice dust catcher. The negative-pressure type orifice dust catcher comprises a negative pressure generator and a dust conveying pipe with a drill rod sleeve, wherein the negative pressure generator comprises a core barrel and an outer barrel coaxially sleeved on the core barrel; one end of the dust conveying pipe is connected to the rear end of the negative pressure generator in a sealed mode; the central line of the other end of the dust conveying pipe is and the axis of the negative pressure generator form a set included angle; the drill rod sleeve passes through the pipe wall on the rear side of the dust conveying pipe; the drill rod sleeve and the negative pressure generator are coaxially arranged; the outer wall surface of the drill rod sleeve is matched with the dust conveying pipe in the sealed mode; an inner turning edge is arranged at the front end of the outer barrel; an air flow channel is arranged between the front end face of the core barrel and the rear side of the inner turning edge and is provided with an air inlet and an air nozzle for spraying air flow backwards to the core barrel; and a drainage surface for leading the air flow sprayed from the air nozzle to a position between the outer wall surface of the drill rod sleeve and the inner wall surface of the dust conveying pipe is arranged on the inner wall surface of the core barrel. The negative-pressure type orifice dust catcher solves the problem of a poor sealing effect of a part, for a drill rod to penetrate, of the conventional orifice dust catcher.

Description

technical field [0001] The invention relates to an auxiliary tool for downhole drilling, in particular to a negative-pressure orifice dust collector. Background technique [0002] When drilling in the coal seam, a lot of dust will be generated on the downwind side of the drilling hole when using wind slag removal, especially when the coal seam is soft and the coal powder particles are very fine, a large amount of dust will be generated, filling the whole The job site will even permeate the entire roadway. It not only threatens and affects the workers on site, but also has a great impact on other workers working in the same roadway. [0003] In order to solve the above problems, the Chinese patent application number 201010601601.3 discloses a dense shallow hole dust collector for coal mines. There are corresponding drill pipe inlets and drill pipe outlets. Dust removal ports and slag discharge ports are provided on the upper and lower sides. A sleeve is provided at the dril...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a negative-pressure orifice dust collector to solve the problem of poor dust-proof and dust-proof effect of the existing orifice dust collector for the part where the drill pipe penetrates.

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