An air bag type fluid pipeline sealing device

Abstract

The invention discloses an airbag type fluid pipeline plugging device. The device includes an expansion guide pipe, a locking ring, a locking plug, a fluid guide pipe and a medium guide pipe. The expansion guide pipe includes an external bag pipe part, an internal bag pipe part and a medium filling space, wherein the end opening wall of the front end opening of the external bag pipe part is clamped between the locking ring and the locking plug, the internal bag pipe part is formed in a pipe body space of the external bag pipe part and distributed around the fluid guide pipe after the end opening wall of the rear end opening of the external bag pipe part is axially folded and extends, the medium filling space is formed between the external bag pipe part and the internal bag pipe part and communicated with the medium guide pipe, and the end opening wall of the internal bag pipe part is fixedly locked onto the locking plug. When the expansion guide pipe is in expansion and deformation, inclined acting force against the inner wall of the pipe can be generated, a bag body formed by the device thus has a larger contact area with the inner wall of the pipe and can more tightly seal and block the pipe. A larger expansion ratio can be obtained by utilizing the structural deformation characteristic of the guide pipe itself, and the applicability of the device to the pipe shape and diameter is enhanced.

Description

technical field [0001] The invention relates to the technical field of pipeline leak plugging equipment, in particular to an air bag type fluid pipeline plugging device. Background technique [0002] As we all know, the airbag-type pipeline sealing device (abbreviation: pipeline sealing airbag) is a kind of pipeline leakage plugging equipment mainly composed of inflatable airbags. When the airbag is inflated, when the pressure in the airbag reaches the specified requirements, the direct contact relationship between the outer wall of the airbag and the inner wall of the pipe and the friction effect can be used to make the airbag be firmly filled in the entire section of the pipe, so as to control the fluid in the target pipe section. Quickly block and achieve the purpose of sealing and blocking the pipe opening of the target pipe section; using the structural principle, the pipe sealing air bag is widely used in the leakage of the transportation pipeline or storage container ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the unreasonable structural design of the existing pipeline blocking airbags, there are many problems such as relatively complicated structure, cumbersome disassembly and replacement of the airbag, poor sealing and blocking effect, and narrow application range; the patent No. US20150177092A1 is disclosed "A Balloon Catheter Device Used for Leak Detection of Internal Combustion Engine Components and High Pressure Leak Detection" as an example and combined with figure 1 and figure 2 As shown, the balloon structure is mainly composed of a fluid conduit 10, an inner lock nut 11 threadedly fitted at both ends of the fluid conduit 10, placed on the periphery of the fluid conduit 10, and the two ends are respectively locked on the fluid conduit 10 by an outer lock nut 12. The expansion conduit 13 on the inner lock nut 11 on the corresponding side and the inflation conduit 14 that is passed through the expansion conduit 13 by one of the inner lock nuts 11 and is eccentrically distributed relative to the fluid conduit 10 are formed. The part where 13 is located is placed in the pipeline A (or pressure vessel), and the inner peripheral space of the expansion conduit 13 is inflated through the inflation conduit 14, so that the outer wall of the expansion conduit 13 is in contact with the inner wall of the pipeline A due to pressure expansion , so as to realize the plugging of pipeline A; its main defects are as follows:

[0004] 1. The expansion conduit 13 and the fluid conduit 10 adopt a tubular structure similar to a small tube with a large tube sleeve, and the two ends are locked together by locking nuts; thus, it is easy to cause the expansion ratio of the expansion conduit 13 to be greatly affected. Especially when sealing the pipeline A with a relatively large diameter, it is easy to reduce the sealing and sealing effect on the pipeline due to the small or no contact area between the outer wall of the expansion catheter 13 and the inner wall of the pipeline A Or cause the failure of the sealing and plugging operation, thereby putting forward higher requirements for the matching of the pipe diameter and the cross-sectional shape of the pipe body to which it is applicable; at the same time, after the expansion catheter 13 is expanded, the direction of force exerted on the inner wall of the pipe A It is distributed along the radial direction of the expansion catheter 13 or the pipeline A (it can be understood as being distributed perpendicular to the inner wall of the pipeline A), so that the sealing effect of the balloon on the pipeline A cannot be maximized; Most of the structural balloons can only seal to a certain extent for circular straight pipes, but cannot effectively seal and seal special-shaped pipes (such as oval or square pipes), which greatly reduces its applicability

[0005] 2. Since the expansion catheter 13 is a vulnerable part (such as: it is easy to break when it is in a sharp structure in the pipeline or when it is in contact with a sharp object), when the expansion catheter 13 needs to be replaced, it is often necessary for the operator to operate the outer tube repeatedly. The locking nut 12 is used to position and lock the two ends of the expansion catheter 13; in this way, not only the operation is cumbersome and time-consuming, but also the success rate of replacement is not high

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