Rushing prevention type pneumatic fast joint

Abstract

The invention relates to a rushing prevention type pneumatic fast joint, which comprises an air inlet connecting sleeve, a sealing baffle ring, an air inlet sealing ring, a valve core, a slide sleeve spring, a valve core anti-contraction bead, a sliding protection sleeve, an inner slide sleeve, an inner slide sleeve anti-contraction bead, an axial position limiting element, an air outlet sealing ring, a middle sealing ring, a valve core inner spring and a valve core outer spring, wherein the valve core is in a closed state before a bleed plug is plugged, the bleed plug pushes the inner slide sleeve and the valve core to simultaneously and leftwards move when the bleed plug is plugged, the valve core is in an open state when an air outlet hole arranged on the valve core exceeds the air inlet sealing ring, the valve core anti-contraction bead is in reliable contact with an opening step when the valve core anti-contraction bead is in contact with the opening step of the valve core, and the valve core is ensured to be in a reliable ventilation state. When the bleed plug needs to be dismounted, the valve core rightwards moves under the effects of the valve core outer spring and the air pressure, the valve core is in the closed state when a closing step is in contact with the valve core anti-contraction bead, the bleed plug only receives the elasticity of the valve core spring when being disconnected, and the reverse rushing force is very small.

Description

Technical field: [0001] The invention relates to a pneumatic quick-change joint widely used for quick connection of gas delivery pipelines. Background technique: [0002] Pneumatic quick-change joints are widely used in various fields as an essential connection part for quick connection of gas pipelines. In Chinese patent CN201152427Y (patent number ZL2008200001837.8), a "safety-type pneumatic quick-change joint is disclosed. The pneumatic quick-change joint of this structure When the ferrule is detached, the change joint can prevent the ferrule from rushing out in the opposite direction and realize the function of preventing rushing out. It is a kind of pneumatic quick-change joint with better anti-rushing performance in the prior art. However, its structure is complicated and the parts The processing technology requirements are very high, and the conventional processing technology is difficult to meet, especially the three parts of the socket, the position control collar a...

AI Technical Summary

Problems solved by technology

However, its structure is complex, and the processing technology of the parts is very high, which is difficult to meet with the conventional processing technology. Especially for the three parts of the socket, the position control collar and the movable seat, the processing technology is not ideal, the processing cost is high, and the user Difficult to accept

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