Method for connecting large-diameter composite metal-plastic pipes

A connection method, metal-plastic technology, applied in the direction of pipeline connection arrangement, pipe/pipe joint/pipe fitting, mechanical equipment, etc., can solve the problem of excessive size deviation, etc., to overcome size deviation, facilitate construction, and eliminate insufficient socket depth Effect

Inactive Publication Date: 2002-04-03
罗荣尧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not fundamentally solve the problem that the size deviation of large-diameter pipes and fittings in the manufacturing process exceeds the range allowed by the current hot-melt connection technology, so it cannot effectively solve the problem of the hot-melt surface at the pipe connection. The fundamental problem is that the melted plastic cannot fill the gap and affect the quality of the pipe
Therefore, this method still cannot effectively and reliably connect large-diameter (especially more than 1000 mm in diameter) pipes.

Method used

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  • Method for connecting large-diameter composite metal-plastic pipes
  • Method for connecting large-diameter composite metal-plastic pipes
  • Method for connecting large-diameter composite metal-plastic pipes

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1: as figure 1 , 2 As shown, the pipe connection method in this embodiment is to first bring the ends of the two pipes 1 and 2 to be connected close together and align them, and then bond the outer pipe wall of the two ends of the pipes with a bonding method. Layers of spliced ​​block layer 3, the bonded spliced ​​block layer 3 covers the outer pipe wall of the two ends of the pipe to be connected.

[0040] In this embodiment, there is one split block constituting the split block layer 3 . The splicing block is actually made of a section of plastic pipe, and one side of the plastic pipe is cut along the axis of the pipe body, so that its cross section becomes a ring-shaped structure with a fracture (at the cut position) Form a fracture), when the above-mentioned splicing block is bonded to the two ends of the pipe to be connected, and when the fractures are brought together, the splicing block can be spliced ​​into a tubular structure that covers the two en...

Embodiment 2

[0042] Embodiment 2: as image 3 , 4, the pipeline connection method in this embodiment is similar to that in Embodiment 1, that is, the connection of the pipelines is still implemented in a single-layer spliced ​​block layer. The difference is that in this embodiment, the bonding method used is heat Melt bonding method.

[0043] In addition, the combined block installed in this embodiment is a combined block provided with an observation hole 6 and an exhaust hole 7 . The opening direction of the observation hole 6 is from the outer surface of the splicing block to its inner surface (the observation hole 6 in this example is a blind hole). Vent 7 then runs through the inner and outer surfaces of the splicing block.

[0044] In this embodiment, the inner wall of the split block and the outer pipe wall of the two ends to be connected of the pipes 1 and 2 all have a thermoplastic layer, so the hot melt connection method is used to bond the split block layer 3 to the outer pipe ...

Embodiment 3

[0047] Embodiment 3: as Figure 5 , 6 As shown, the pipeline connection method in this embodiment is similar to that in Embodiment 2, that is, the single-layer spliced ​​block layer 3 is still used and bonded by a hot-melt connection method. The difference is that in this embodiment, the above-mentioned spliced ​​block Layer 3 is formed by splicing three pieces together. Simultaneously, the inner surface (surface to be bonded) of the used splicing block used in the present embodiment is preset with heating wire 8 (such as Figure 7~1 0), therefore no longer lay heating wires between the splicing block and the outer pipe wall at the second end of the pipe to be connected.

[0048] The concrete bonding method of the splicing block layer 3 in this example is: the surface to be bonded of the splicing block that is preset with the heating wire 8 is pasted to the outer pipe wall of the second end of the pipe to be connected, and then to the heating wire 8 on the splicing block Ap...

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Abstract

A method for the connection between two large-diameter composite metal-plastic pipes includes such steps as moving them closely while aligning them for butt connection, and adhering a splicing layer on the external surface of both ends to be connected for cladding them. Its advantages include easily making said splicing block layer composed of splicing units, easy operation and high connection reliability.

Description

technical field [0001] The invention relates to a method for connecting pipes, in particular to a method for connecting large-diameter metal-plastic composite pipes. Background technique [0002] At present, metal-plastic composite pipes have been widely used in many fields, and the accompanying new technology of pipe connection has also emerged. In the specific implementation, the connection of small-diameter pipes uses heating tools to make the pipes and fittings to be connected hot-melt and then implement socket connection. It is feasible, and the melted plastic after heating can fill the gap between pipes and pipe fittings and achieve sealing. In addition, the dimensional deviation between small-diameter pipes and pipe fittings can also be controlled within the range allowed by the hot-melt socket technology. However, when the diameter of the pipe increases, due to the increase in volume and weight of the pipe and pipe fittings, it is not only impossible to implement t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L47/02
Inventor 罗荣尧
Owner 罗荣尧
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