A pipe joint jointing device, jointing method and pipe system

Abstract

The application provides a pipeline joint jointing device, a jointing method and a pipeline system. The pipeline joint jointing device comprises an electrofusion pipe fitting and a hard outer protective pipe sleeved outside the electrofusion pipe fitting. A wiring hole is formed in the hard outer protective pipe, and an electrofusion welding connecting wire for connecting the electrofusion pipe fitting is arranged in the wiring hole. A gap for filling foaming material is formed between the hard outer protective pipe and the electrofusion pipe fitting. The electrofusion pipe fitting, the hard outer protective pipe and two pipelines to be jointed are assembled in advance, then the pipelines are connected through heat fusion, and finally the outermost hard outer protective pipe is connected, so that the hard outer protective pipe cannot be used due to the welding.

Description

Technical Field

[0001] This invention relates to the field of heating pipeline technology, specifically to a pipe joint repair device, a method for repairing pipe joints using the repair device, and a pipeline system using the repair device. Background Technology

[0002] Pre-insulated PE-RT pipes made of polyurethane foam are commonly used for underground pipes. The insulation treatment of the joint between two PE-RT insulated pipes is a very important construction control point. If a leak occurs at the joint, groundwater will seep in, the entire insulation structure will be damaged, heat loss will be large, and the service life of the pipe will be affected.

[0003] The existing insulation technology for buried PE-RT pre-insulated pipe joints involves first welding two PE-RT pipes together using a hot-melt welding machine, then wrapping the joint with PE rubber, and finally using heat-shrink tape or PE pipe welding rods for bonding. The shortcomings of this existing technology are:

[0004] For ease of construction, existing technology uses PE rubber sheets for splicing. However, this rubber is soft and prone to deformation during splicing, welding, and foaming, affecting the quality of the joint. Furthermore, the outer sheath near the joint is not made of a high-density material, making it susceptible to deformation and damage during thermal expansion during operation. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A pipe joint repair device, comprising:

[0007] Electrofusion fittings; and

[0008] A rigid outer protective tube is fitted over the electrofusion fitting, and a wiring hole is provided on the rigid outer protective tube, through which an electrofusion welding connection wire for connecting the electrofusion fitting is passed;

[0009] A gap for filling with foam material is formed between the rigid outer sheath and the electrofusion fitting;

[0010] The electrofusion fitting is used to insert into two pipes to be repaired. The electrofusion fitting, the rigid outer protective tube, and the two pipes to be repaired are pre-assembled into one unit before being heat-fused together. The rigid outer protective tube can cover the electrofusion fitting and the two pipes to be repaired during pre-assembly.

[0011] The present invention also provides a method for repairing pipe joints, comprising the following steps:

[0012] Provide a rigid outer protective tube;

[0013] Insert the electrofusion fitting into the inner cavity of the rigid outer protective tube, and then insert the two pipes to be repaired into the electrofusion fitting;

[0014] The two pipes are joined at the interface by thermofusion.

[0015] Connect the rigid outer sheath to the outer sheath ports of the two pipes; and

[0016] The gap between the rigid outer sheath and the electrofusion fitting is treated with foaming.

[0017] Furthermore, the thermofusion connection of the two pipes at their interface is specifically as follows:

[0018] A wiring hole is made in the rigid outer sheath, and an electrofusion welding connection wire is inserted into the wiring hole;

[0019] The two pipes are joined by thermofusion at their joints, and then the electrofusion welding wire is removed.

[0020] Furthermore, it also includes conducting an airtightness test on the gap between the rigid outer sheath and the electrofusion fitting through the wiring hole before the foaming process.

[0021] Preferably, the rigid outer protective pipe is made of high-density polyethylene material, using the same high-density polyethylene pipe outer protective pipe as the PE-RT pre-insulated pipe, which is more durable than PE material rubber.

[0022] The present invention also provides a piping system comprising a plurality of pipe elements, wherein adjacent pipe elements are connected by the aforementioned pipe joint patching device.

[0023] As can be seen from the above technical solution, the present invention first assembles the electrofusion fitting, the rigid outer protective pipe, and the two pipes to be repaired in advance, then heat-fused the pipes together using thermofusion, and finally connects the outermost rigid outer protective pipe. This avoids the inability to use the rigid outer protective pipe due to pre-welding. In addition, the present invention only requires welding at the two weld joints and two wiring holes that connect to the pipes. This results in fewer weld joints, making construction convenient. The welding position is consistent with the pipe size, preventing stress concentration during thermal expansion and improving the stability of the pipeline during operation. It also eliminates the need for complex large welding equipment, making construction organization convenient and cost-effective. Attached Figure Description

[0024] Figure 1 This is an isometric view of the pipe joint repair device of the present invention;

[0025] Figure 2 This is a radial sectional view of the pipe joint patching device of the present invention;

[0026] Figure 3 This is an assembly diagram of the pipe joint patching method of the present invention. Detailed Implementation

[0027] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] The pipe joint repair device of the present invention is a device for heat-fusion connection of two pipe joints and for achieving heat insulation treatment. In this embodiment, it is used for joint treatment of PE-RT insulated pipes prefabricated with polyurethane foam. The PE-RT insulated pipe is wrapped with a layer of high-density polyethylene outer protective pipe. Before performing heat-fusion connection of the joint, a portion of the high-density polyethylene outer protective pipe at the joint of the PE-RT insulated pipe needs to be removed.

[0029] like Figure 1 and 2 As shown, the pipe joint repair device includes an electrofusion fitting 1 and a rigid outer protective pipe 2 sleeved outside the electrofusion fitting. The electrofusion fitting 2 can be connected to an external thermofusion device to perform thermofusion connection on the joint of the PE-RT insulation pipe 3 inserted into the electrofusion fitting 1.

[0030] In this embodiment, the rigid outer sheath 2 is made of the same high-density polyethylene material as the outer sheath 31 of the PE-RT insulation pipe 3, to prevent deformation caused by subsequent hot-melt, welding, and foaming processes, ensuring the quality of the interface, and facilitating welding together with the outer sheath of the PE-RT insulation pipe. To facilitate the hot-melt treatment of the electrofusion fitting 1, two wiring holes 21 are provided on the rigid outer sheath 2. An electrofusion welding connecting wire 11 for connecting the electrofusion fitting 1 is threaded through the wiring hole 21. The electrofusion welding connecting wire 11 is directly pulled out after the hot-melt treatment, and the two wiring holes 21 are also repaired.

[0031] Since the rigid outer protective tube 2 is sleeved on the electrofusion fitting 1, there will be a gap 4 between them. It is necessary to fill the gap 4 with foaming material through foaming equipment to prevent water seepage.

[0032] By using the pipe joint repair device of the present invention, the three structures of rigid outer protective pipe 2, electrofusion fitting 1 and PE-RT insulation pipe 3 are assembled in advance, which can avoid the situation that the rigid outer protective pipe cannot be installed after the PE-RT insulation pipes at both ends are welded together, thus improving the joint connection effect.

[0033] The present invention also provides a piping system comprising a plurality of pipe components, wherein adjacent pipe components are connected by a pipe joint patching device to ensure welding quality.

[0034] See attached document Figure 3 The present invention also provides a method for repairing pipe joints, comprising the following steps:

[0035] First, a rigid outer protective tube 2 needs to be provided. In this embodiment, the outer protective tube 31 of the PE-RT insulation pipe 3 is made of high-density polyethylene material.

[0036] Then, the electrofusion fitting 1 is inserted into the inner cavity of the rigid outer protective tube 2, and the two PE-RT insulation tubes 3 to be repaired are then inserted into the electrofusion fitting 1.

[0037] Two wiring holes 21 are made on the rigid outer protective tube 2, and an electrofusion welding connection wire 11 is inserted into the wiring holes;

[0038] The two PE-RT insulation pipes 3 are thermofused together at their joints, and then the electrofusion welding connection wire 11 is removed.

[0039] Weld the rigid outer protective tube 2 to the outer protective tube 31 of the two PE-RT insulation tubes 3;

[0040] Finally, the airtightness of the gap 4 between the rigid outer protective tube 2 and the electrofusion fitting 1 is tested through the wiring hole 21. After the airtightness test is qualified, the gap 4 is foamed. After the foaming is completed, the wiring hole 21 is filled.

[0041] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A pipe joint repair device, characterized in that, include: Electrofusion fittings; as well as A rigid outer protective tube is fitted over the electrofusion fitting, and a wiring hole is provided on the rigid outer protective tube, through which an electrofusion welding connection wire for connecting the electrofusion fitting is passed; A gap for filling with foam material is formed between the rigid outer sheath and the electrofusion fitting; The electrofusion fitting is used to insert into two pipes to be repaired. The electrofusion fitting, the rigid outer protective tube, and the two pipes to be repaired are pre-assembled into one unit before being heat-fused together. The rigid outer protective tube can cover the electrofusion fitting and the two pipes to be repaired during pre-assembly.

2. The pipe joint repair device according to claim 1, characterized in that, The rigid outer protective tube is made of high-density polyethylene.

3. The pipe joint repair device according to claim 1 or 2, characterized in that, The pipe is a PE-RT pipe.

4. A method for repairing pipe joints, characterized in that, Includes the following steps: Provide a rigid outer protective tube; Insert the electrofusion fitting into the inner cavity of the rigid outer protective tube, and then insert the two pipes to be repaired into the electrofusion fitting; The two pipes are joined at the interface by thermofusion. Connect the rigid outer sheath to the outer sheath ports of the two pipes; and The gap between the rigid outer sheath and the electrofusion fitting is treated with foaming.

5. The pipe joint repair method according to claim 4, characterized in that, The process of thermo-fusion connecting the two pipes at their interface is specifically as follows: A wiring hole is made in the rigid outer sheath, and an electrofusion welding connection wire is inserted into the wiring hole; The two pipes are joined by thermofusion at their joints, and then the electrofusion welding wire is removed.

6. The pipe joint repair method according to claim 5, characterized in that, The number of wiring holes is two.

7. The pipe joint repair method according to claim 4, characterized in that, It also includes conducting an airtightness test on the gap between the rigid outer sheath and the electrofusion fitting through the wiring hole before the foaming process.

8. The pipe joint repair method according to claim 4, characterized in that, The rigid outer protective tube is made of high-density polyethylene.

9. The pipe joint repair method according to claim 4, characterized in that, The pipe is a PE-RT pipe.

10. A piping system comprising a plurality of piping elements, characterized in that, Adjacent pipe elements are connected by a pipe joint fitting device as described in any one of claims 1-3.

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