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Inner expansion connecting structure for screw sleeve type steel and plastic composite pipe

A technology of steel-plastic composite pipe and connection structure, which is applied in the direction of sealing surface connection, pipe/pipe joint/pipe fitting, passing components, etc., which can solve problems such as easy leakage, small deformation, and bad influence of pipe connection sealing, and achieve airtightness Reliable and effective in improving pull-out resistance

Active Publication Date: 2012-01-11
重庆顾地塑胶电器有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of fast sealing connection of steel-plastic composite pipes, various connection structures have been proposed in the prior art. Among them, the structure of expansion connection has the advantages of no diameter reduction, strong resistance to pulling out, reliable sealing, and easy disassembly. The advantages become the most widely used connection structure. The existing expansion connection structure generally uses a threaded ring and a snap ring to imprison two pipes to be connected with expansion protrusions, such as the patent ZL200510113148.7 "steel-plastic composite pressure However, the above-mentioned expansion connection structure still has the following two disadvantages: 1) The pull-out force is limited by the strength of the steel pipe in the steel-plastic composite pipe. When the pull-out force is too large, the expansion The protrusion may still be squeezed and deformed to return to the size of the normal pipe diameter, causing the pipe connection to be disengaged; 2) Even if the expansion protrusion does not fall off under the action of the pull-out force, it is easy to produce small deformation, which will damage the pipe connection. The sealing has adverse effects. When the pipeline is used for hot water, high-pressure medium, etc., it is easy to leak

Method used

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  • Inner expansion connecting structure for screw sleeve type steel and plastic composite pipe
  • Inner expansion connecting structure for screw sleeve type steel and plastic composite pipe

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings, as shown in the figure: the screw sleeve type steel-plastic composite pipe internal expansion connection structure of this embodiment includes a threaded sleeve 1 and a ferrule 2 coaxially arranged side by side, and a threaded sleeve 1 and a ferrule. The sleeve 2 has a screw sleeve 3 that adjusts the distance between the two. An axial support step 2a is arranged on the outer circle of the ferrule 2. The internal thread of the screw sleeve 3 cooperates with the external thread of the threaded sleeve 1. One end is provided with an axial tension step 3a that withstands the axial support step 2a, and the distance between the threaded sleeve 1 and the ferrule 2 can be adjusted by turning the threaded sleeve 3, and the threaded sleeve 1 is far away from the end of the ferrule 2 and the ferrule. The end of the sleeve 2 away from the threaded sleeve 1 is provided with an annula...

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Abstract

The invention discloses an inner expansion connecting structure for a screw sleeve type steel and plastic composite pipe, which comprises a threaded sleeve and a clamp sleeve in coaxial parallel arrangement, wherein a screw sleeve for regulating the distance between the threaded sleeve and the clamp sleeve is sheathed outside the threaded sleeve and the clamp sleeve, the end part of the threaded sleeve far away from the clamp sleeve and the end part of the clamp sleeve far away from the threaded sleeve are respectively provided with inwards projected annular shoulders in the radial direction,two pipelines requiring the butt joint respectively extend into the structure from the annular shoulder parts of the threaded sleeve and the clamp sleeve, annular expansion bulges are respectively and outwards expanded on the extending sections of the two pipelines requiring the butt joint in the radial direction, the two expansion bulges are respectively and tightly butted on the two annular shoulders, an lining sleeve sheathed outside the two pipelines requiring the butt joint is rightly butted and arranged between the two expansion bulges, both sides of the expansion bulges are respectively butted by the end parts of the annular shoulders and the lining sleeve, the expansion bulges can not easily generate and recover the deformation to disconnect the pipeline even when the pipeline receives excessive disconnecting force, and the anti-disconnecting capability of the connecting structure is effectively improved, simultaneously, the expansion bulges can not easily generate the deformation, the position of a pipe opening is relatively fixed, and the sealing is more reliable.

Description

technical field [0001] The invention relates to a pipeline sealing connection structure, in particular to a sealing connection structure of a steel-plastic composite pressure pipe. Background technique [0002] Steel-plastic composite pipe is a new type of composite pipe, which has the advantages of strong pressure bearing capacity, good corrosion resistance, and small linear expansion coefficient. At present, it has been more and more used in oil and gas transportation, industrial and mining pipes, Drinking water pipes, drainage pipes and other fields. [0003] In order to solve the problem of fast sealing connection of steel-plastic composite pipes, various connection structures have been proposed in the prior art. Among them, the structure of expansion connection has the advantages of no diameter reduction, strong resistance to pulling out, reliable sealing, and easy disassembly. The advantages become the most widely used connection structure. The existing expansion con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L19/028F16L19/03
Inventor 冉超付志敏李贤梅邹镇
Owner 重庆顾地塑胶电器有限公司
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