CN205669654U - Interior anticorrosion pipeline joint connecting structure - Google Patents

Abstract

The utility model discloses an interface connection structure of an internal anti-corrosion pipeline, which comprises a pipeline body and an anti-corrosion layer on the inner wall of the pipeline body. The end of the pipeline body is fixedly connected with a joint, the anti-corrosion layer is an integrated structure, After the joint is welded, a heat-insulating sealed cavity with an annular space is formed. The welding port is isolated from the anti-corrosion layer through the heat-insulated sealed cavity. The joint is also provided with a hole communicating with the heat-insulated sealed cavity, and a sealing plug is fixed in the hole. , the heat-insulating sealed cavity is provided with fillers filled through holes. The utility model has reasonable structure, can reduce heat conduction, can effectively prevent damage to the anti-corrosion layer, has good sealing and anti-corrosion performance, can effectively prevent pipeline leakage, and prolongs the service life of the pipeline.

Description

Internal anti-corrosion pipeline interface connection structure

technical field

The utility model relates to a connection structure of pipelines, in particular to an interface connection structure of internal anti-corrosion pipelines.

Background technique

At present, the corrosion of gathering and transportation pipelines or underwater pipelines in petroleum and petrochemical industries is extremely serious, which directly affects the service life of pipelines, resulting in additional increases in construction costs and total costs. In order to reduce and prevent the corrosion damage of the pipeline and improve its service life, it is generally used to apply an anti-corrosion coating or lining to the inner wall of the metal pipeline. Nowadays, the common connection methods of anti-corrosion pipelines include flange connection, socket rubber ring sealing connection and welding, etc. Since the flange connection and rubber ring connection require the sealing material to have anti-corrosion performance and high temperature resistance, the cost is increased, and there is a sealing In order to improve the strength and tightness of the pipe joints, economical and reliable welding methods are generally used for joints. However, when the metal pipeline with anti-corrosion layer is welded and installed, the high temperature generated by welding will destroy the anti-corrosion layer at the weld, which not only affects the effect of internal anti-corrosion, makes it lose the function of protecting the pipeline, and reduces its sealing In severe cases, it is easy to corrode locally and cause perforation, which affects the life of the entire pipeline. It is difficult to inspect and repair underwater, causing huge economic losses. In addition, since the anti-corrosion lining is generally made of special plastic material, the high temperature generated during welding is easy to conduct heat to the anti-corrosion layer, causing damage to it and affecting the anti-corrosion effect.

Contents of the invention

The purpose of this utility model is to aim at the defects of the existing technology, to provide a reasonable structure, which can reduce heat conduction, can effectively prevent damage to the anti-corrosion layer, has good sealing and anti-corrosion performance, can effectively prevent pipeline leakage, and prolong the service life of the pipeline. Long-life internal anti-corrosion pipeline interface connection structure.

Its technical solution is: an internal anti-corrosion pipeline interface connection structure, including a pipeline body and an anti-corrosion layer located on the inner wall of the pipeline body, the end of the pipeline body is fixedly connected with a joint, the anti-corrosion layer is an integrated structure, and the two joints are welded Finally, a heat-insulating sealed cavity with an annular space is formed, and the welding joint is isolated from the anti-corrosion layer through the heat-insulated sealed cavity. The joint is also provided with a hole communicating with the heat-insulated sealed cavity. The heat-insulating sealed cavity is provided with fillers filled through the holes.

The joint is fixedly arranged on the outer surface of the end of the pipe body.

The joint includes a connecting portion whose inner diameter is the same as the outer diameter of the pipe body and a heat insulating portion whose diameter is larger than the connecting portion, the heat insulating portion is arranged parallel to the pipe body, and the heat insulating portions of two adjacent joints are welded together.

The anti-corrosion layer is a continuous structure arranged on the inner surface and the end surface of the pipeline.

The joint is fixed at the end of the pipe body.

The joint is composed of an inner cylinder and an outer cylinder coaxial with the inner cylinder, one end of the outer cylinder is connected to the inner cylinder, the outer cylinders of the joints of two adjacent pipes are welded together, and the inner cylinder and the outer cylinder are formed Ring-shaped heat-insulated sealed cavity.

The anti-corrosion layer is a continuous structure arranged on the inner surface and end surface of the inner cylinder and the inner surface of the pipeline.

The axial cross-sections of the inner and outer cylinders are U-shaped or H-shaped.

Compared with the prior art, the utility model has the following advantages: the structure is reasonable, and by setting the heat-insulating sealing cavity on the joint, not only the welding joint is kept away from the anti-corrosion layer, but also the heat-insulating sealing cavity can isolate it from the anti-corrosion layer, so that Non-linear conduction of heat conduction can not only reduce thermal conductivity, but also effectively prevent damage to the anti-corrosion layer caused by high temperature during welding. The anti-corrosion layer is set as an integrated structure, and the inner flanges of the anti-corrosion layer of two adjacent joints are in corresponding contact. This can improve the overall sealing and anti-corrosion performance, effectively prevent pipeline leakage, and prolong the service life of the pipeline.

Description of drawings

Below is a further description of the utility model in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a half sectional view of the utility model embodiment one;

Fig. 2 is a half sectional view of the second embodiment of the utility model;

In the figure: 1. Pipe body; 2. Joint; 21. Inner cylinder; 22. Outer cylinder; 3. Anti-corrosion layer; 4. Heat insulation sealing cavity; 9. Lining flanging; 10. Connection part; 11. Heat insulation part.

detailed description

The internal anti-corrosion pipeline interface connection structure includes a pipeline body 1 and an anti-corrosion layer 3, and a joint 2 is fixedly connected to the end of the pipeline body 1, wherein the anti-corrosion layer 3 is a continuous structure that is integrally arranged on the inner surface and the end surface of the pipeline. The two joints 2 are welded to form a heat-insulating sealed cavity 4 with an annular space. The welding port 5 is isolated from the anti-corrosion layer 3 through the heat-insulated sealed cavity 4. The joint 2 is also provided with a hole 6 communicating with the heat-insulated sealed cavity. A sealing plug 7 is fixedly provided, and a filler 8 filled through the hole 6 is arranged in the heat-insulating sealed cavity 4 . After the welding of the two joints 2 is completed, fill the filler 8 in the heat-insulating sealing cavity 4 through the hole 6, such as glue, etc. for sealing, and then tightly seal it through the sealing plug 7 to prevent leakage.

After welding, the welding port 5 is isolated from the anti-corrosion layer 3 through the heat-insulating sealing cavity 4. This structure can not only keep the solder joint away from the anti-corrosion layer 3, but also isolate it through the heat-insulating sealing cavity 4, which can effectively prevent heat damage during welding Anti-corrosion layer 3, and the non-linear transfer of heat can reduce heat conduction and further prevent damage to the anti-corrosion layer 3, which not only improves the anti-corrosion performance and sealing performance of the pipeline, but also improves the connection strength at the interface of the pipeline to meet the needs of large enough Seals under pressure.

Embodiment one:

The joint 2 is fixedly arranged on the outer surface of the pipe body 1, and the anti-corrosion layer 3 is arranged on the inner walls of two adjacent pipe bodies. Wherein, the joint includes a connecting portion 10 whose inner diameter is the same as the outer diameter of the pipe body 1 and a heat insulating portion 11 larger in diameter than the connecting portion. welded together. In this way, the solder joints can be kept away from the anti-corrosion layer 3 by welding the two heat-insulating parts 11, and the heat-insulating sealing cavity 4 is used to isolate the anti-corrosion layer 3, which can effectively prevent the heat during welding from damaging the anti-corrosion layer 3, and the non-linear transfer of heat can reduce heat conduction. Further prevent damage to the anti-corrosion layer 3, which not only improves the anti-corrosion performance and sealing performance of the pipeline, but also improves the connection strength at the joint of the pipeline to meet the sealing under a sufficient pressure.

The ends of two adjacent pipe bodies 1 are provided with lining flanges 9 extending along the anti-corrosion layer 3, and the lining flanges 9 of two adjacent joints 2 are in corresponding contact, through which the lining flanges 9 are connected to the two joints 2 The heat insulation part 11 and the pipeline body 1 form an annular heat insulation sealed cavity 4. Corresponding contact of the inner lining flange 9 can prevent leakage into the anti-corrosion layer 3 when the filler 8 is filled into the heat-insulating sealed cavity 4, thereby improving the sealing performance.

During specific installation, the pipe body 1 is first welded with the joint 2, so that the inner wall of the joint 2 is fixed to the outer surface of the pipe body 1, and then the anti-corrosion layer 3 is laid on the inner wall of the pipe body 1, and the end of the pipe body 1 faces Flip outward to form the inner lining flanging 9, align the two adjacent joints 2, make the inner lining flanging 9 at the end of the pipe body 1 press into contact, and weld the heat insulation part 11, wherein the welding joint 5 is the opposite Two adjacent heat insulation parts 11 are welded. After the welding is completed, the heat insulation part 11 and the pipe body 1 form a heat insulation sealing cavity 4, and fill the heat insulation sealing cavity 4 with a filler 8 through the hole 6, such as glue, etc. for sealing , and then plug hole 6 by sealing plug 7 to prevent leakage.

Embodiment two:

Referring to Fig. 2, the above-mentioned joint 2 is fixed on the end of the pipe body 1, the inner diameter of the joint 2 is consistent with the inner diameter of the pipe body 1, and the inner walls of the pipe body 1 and the joint 2 are provided with an anti-corrosion layer 3, and the anti-corrosion layer 3 is set The continuous structure of the inner surface and end surface of the inner cylinder and the inner surface of the pipe can weld two adjacent joints 2 to connect the two pipe bodies 1 .

The joint includes an inner cylinder 21 and an outer cylinder 22 coaxial with the inner cylinder 21. One end of the outer cylinder 22 is connected to the inner cylinder 21. The outer cylinders 22 of the joints of two adjacent pipes are welded together. The inner cylinder 21 and the inner cylinder 21 are connected to each other. An annular heat-insulating sealed chamber 4 is formed between the outer cylinders 22 . Since the outer cylinder 22 is far away from the anti-corrosion layer 3, the solder joints can be kept away from the anti-corrosion layer 3 without damaging the anti-corrosion layer 3, thereby ensuring the anti-corrosion effect.

At the same time, when the anti-corrosion layer 3 is laid, it can extend at the inner tubes 21 of the two adjacent joints 2 and form a lining flange 9, that is, the two lining flanges 9 wrap the end faces of the inner tubes 21, and the adjacent The lining flanging 9 of the two joints 2 is in corresponding contact, that is, the inner cylinder 21 of the two joints 2 is shorter than the outer cylinder 22, so that the inner lining between the two inner cylinders 21 can be turned up while welding the outer cylinder 22 9 close contact, to prevent leakage into the anti-corrosion layer 3 when filling the filler 8 into the heat-insulating sealed cavity 4, and improve the sealing performance.

Wherein, the axial cross-sections of the inner cylinder 21 and the outer cylinder 22 are U-shaped or H-shaped. Certainly, other structures capable of realizing the isolation function may also be used as required.

It can be seen from the above that the welding joint 5 of the joint 2 is far away from the anti-corrosion layer 3, and the structure with the isolated sealing cavity 4 is within the scope of protection.

During specific installation, the pipe body 1 is welded with the joint 2 first, and after the inner wall of the joint 2 is fixed flush with the inner wall of the pipe body 1, an anti-corrosion layer 3 is laid on the inner walls of the pipe body 1 and the joint 2, and the inner cylinder 21 The end of the inner cylinder 21 is turned outward to form a lining flanging 9, and the two adjacent joints are aligned so that the lining flanging 9 at the end of the inner cylinder 21 is extruded and contacted, and the outer cylinder 22 is welded, wherein the weld 5 is Two outer cylinders 22 are welded and formed. After the welding is completed, the outer cylinder 22, the inner cylinder 21 and the inner lining flanging 9 squeezed between the two inner cylinders 21 form a heat-insulating sealed cavity 4, which passes through the hole 6 to the heat-insulated sealed cavity. 4 Fill the filling material 8, such as glue, etc. to seal, and then plug the hole 6 by sealing plug 7 to prevent leakage.

The utility model has a reasonable structure, can reduce heat conduction through the annular heat-insulating sealing chamber 4, can effectively prevent damage to the anti-corrosion layer, has good sealing and anti-corrosion performance, can effectively prevent pipeline leakage, prolong the service life of the pipeline, and reduce the Overall outer diameter for ease of construction.

The utility model is not limited to the above-mentioned embodiments, within the scope of knowledge of those skilled in the art, various changes can also be made without departing from the purpose of the utility model, and the changed content still belongs to the utility model scope of protection.

Claims (8)

1. The interface connection structure of the internal anti-corrosion pipeline, including the pipeline body and the anti-corrosion layer located on the inner wall of the pipeline body. It is characterized in that: the end of the pipeline body is fixedly connected with a joint, and the anti-corrosion layer is an integrated structure. A heat-insulating sealed chamber with an annular space is formed, and the welding port is isolated from the anti-corrosion layer through the heat-insulated sealed chamber. A hole communicating with the heat-insulated sealed chamber is also provided on the joint, and a sealing plug is fixed in the hole. The heat-insulating sealed cavity is provided with fillers filled through the holes. 2. The interface connection structure of the internal anti-corrosion pipeline according to claim 1, characterized in that: the joint is fixedly arranged on the outer surface of the end of the pipeline body. 3. The internal anti-corrosion pipeline interface connection structure according to claim 2, characterized in that: the joint includes a connecting part whose inner diameter is the same as the outer diameter of the pipeline body and a heat insulating part whose diameter is larger than the connecting part, and the heat insulating part and the The pipe body is arranged in parallel, and the heat insulation parts of two adjacent joints are welded together. 4. The internal anti-corrosion pipeline interface connection structure according to claim 2 or 3, characterized in that the anti-corrosion layer is a continuous structure arranged on the inner surface and end surface of the pipeline. 5. The internal anti-corrosion pipeline interface connection structure according to claim 1, characterized in that: the joint is fixed at the end of the pipeline body. 6. The interface connection structure of the internal anti-corrosion pipeline according to claim 5, wherein the joint is composed of an inner cylinder and an outer cylinder coaxial with the inner cylinder, one end of the outer cylinder is connected with the inner cylinder, adjacent The outer cylinders of the joints of the two pipes are welded together, and an annular heat-insulating sealed cavity is formed between the inner cylinder and the outer cylinder. 7. The interface connection structure of the internal anti-corrosion pipeline according to claim 6, wherein the anti-corrosion layer is a continuous structure provided on the inner surface and end surface of the inner cylinder and the inner surface of the pipeline. 8. The internal anti-corrosion pipeline interface connection structure according to claim 6 or 7, characterized in that: the axial cross-sections of the inner cylinder and the outer cylinder are U-shaped or H-shaped.