Anti-corrosion steel pipe

Abstract

The utility model discloses an anti-corrosion steel pipe, which belongs to the technical field of anti-corrosion steel pipes and comprises a first steel pipe and a second steel pipe which are mutually welded and fixed, the close ends of the first steel pipe and the second steel pipe are fixedly sleeved with positioning rings, and the inner walls of the two positioning rings are fixedly provided with connecting rings. Air isolation plates are symmetrically fixed between the two connecting rings, protruding parts are arranged at the center positions of the inner walls of the air isolation plates, and sealing plates tightly connected with the first steel pipe and the second steel pipe are fixedly embedded in the inner walls of the protruding parts. According to the anti-corrosion steel pipe, the sealing plates on the protruding parts of the inner wall of the air isolation plate are tightly connected with the welding part, the air isolation plate is kept fixed through the first bolts on the connecting parts, the welding part of the steel pipe can be protected and isolated from air, and therefore the situation that the welding part of the steel pipe is corroded is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of anticorrosive steel pipe, and particularly relates to an anticorrosive steel pipe. BACKGROUND

[0002] At present, the base metal of the anticorrosive steel pipe includes seamless steel pipes, spiral steel pipes and straight seam steel pipes. The anticorrosive coating with a three-layer structure is widely used in the petroleum pipeline industry due to its good corrosion resistance, water vapor permeability resistance and mechanical properties. The anticorrosive layer of the anticorrosive steel pipe is crucial to the service life of the buried pipeline. Some pipelines made of the same material do not corrode for decades after being buried underground, while some pipelines leak after a few years. This is because they use different outer anticorrosive layers.

[0003] Referring to the prior art document CN217234886U, when the steel pipe body needs to be welded and connected, the water storage ring is rotated so that the opening is directed upward, and then water is added into the water storage ring so that the water storage ring is filled with water. When the steel pipe body is welded and connected, the water in the water storage ring can cool the end part of the steel pipe body to prevent the end part of the anticorrosive combined layer from failing and losing the anticorrosive performance after being subjected to high temperature. When the steel pipe body needs to be rotated and welded, the water storage ring can be stabilized so that the water storage ring remains stationary during the rotation and welding of the steel pipe body, thereby preventing the water in the water storage ring from spilling out and ensuring effective cooling of the end part of the steel pipe body.

[0004] In the above technical solution, only the cooling of water can reduce the influence of high temperature on the end part of the anticorrosive layer of the steel pipe during welding, but the welded part of the steel pipe still loses the protection of the anticorrosive layer. After the welded steel pipe is buried, the welded part is more susceptible to corrosion than other parts of the steel pipe, which may cause pipeline leakage and affect the overall service life of the pipeline. UTILITY MODEL CONTENTS

[0005] (1) Technical problem to be solved

[0006] In view of the deficiencies of the prior art, the purpose of the utility model is to provide an anticorrosive steel pipe which aims to solve the technical problem that the welded part of the steel pipe still loses the protection of the anticorrosive layer in the prior art, and after the welded steel pipe is buried, the welded part is more susceptible to corrosion than other parts of the steel pipe, which may cause pipeline leakage and affect the overall service life of the pipeline.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the utility model provides a kind of anticorrosion steel pipe, the anticorrosion steel pipe includes mutually welded fixed first steel pipe and second steel pipe, the first steel pipe and the second steel pipe are close to one end and are fixedly sleeved with positioning ring, the inner wall of two positioning rings is fixed with connecting ring, air insulation plate is fixed symmetrically between two connecting rings, the inner wall center position of air insulation plate is provided with protruding portion, the inner wall of protruding portion is inlayed and fixed with sealing plate that is closely connected with first steel pipe and second steel pipe respectively.

[0009] When the present technical solution is used, air insulation plates are installed on the welding positions of the first steel pipe and the second steel pipe, and after welding, the two air insulation plates are sleeved between the first steel pipe and the second steel pipe. The sealing plates on the protruding portions of the inner walls of the air insulation plates are closely connected with the welding parts, and the air insulation plates are kept fixed by the first bolts on the connecting parts. This facilitates the protection and air isolation of the welding parts of the steel pipe, thereby greatly reducing the corrosion of the welding parts of the steel pipe. The positioning rings are fixed on the first steel pipe and the second steel pipe, the first bolts in the grooves keep the positioning rings fixed, the connecting rings on the side walls of the positioning rings are installed with rubber sealing plates, the two ends of the air insulation plates are closely connected with the rubber sealing plates, which further blocks the air. At the same time, the two ends of the air insulation plates are closely connected with the positioning rings, which avoids the sliding of the air insulation plates after installation and improves the stability of the installation of the air insulation plates.

[0010] Preferably, a plurality of grooves are arranged in an annular array on the outer wall of the positioning ring, and a second bolt is inlayed in each groove.

[0011] Further, a plurality of second bolts are respectively screwed into the screw holes formed on the outer walls of the first steel pipe and the second steel pipe.

[0012] Further, a clamping groove is formed at the center position of the outer wall of the connecting ring, and a rubber sealing ring is inlayed and fixed in the clamping groove.

[0013] Further, the inner wall of the air insulation plate is closely connected with the rubber sealing ring, and the two ends of the two air insulation plates are provided with connecting parts.

[0014] Further, a through hole is formed at each end of the connecting part, and a first bolt is installed between the two through holes on the same side.

[0015] Further, a welding groove is formed on the outer wall of the end of the first steel pipe and the second steel pipe close to each other, and a glass flake paint layer is arranged on the outer wall of the first steel pipe and the second steel pipe. The first steel pipe and the second steel pipe are both provided with an inner epoxy coating.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the utility model has the advantages of

[0018] The utility model discloses a first steel pipe and second steel pipe's welding position are equipped with the air insulation board of installation, after welding, two air insulation boards are equipped between the first steel pipe and second steel pipe, and the sealing plate on the inner wall convex part of air insulation board is closely connected with the welding part, and through the first bolt on the connecting portion, air insulation board keeps fixed, and the welding part of steel pipe is conveniently protected from air isolation, thereby greatly reduce the corrosion condition that steel pipe welding part receives,

[0019] Through being fixed with the positioning ring on the first steel pipe and second steel pipe, the first bolt in the recess makes the positioning ring keep fixed, and the connecting ring on the side wall of positioning ring is equipped with rubber sealing plate, and both ends of air insulation board are closely connected with rubber sealing plate, further block the air, and the both ends of air insulation board are closely connected with the positioning ring, avoid the situation that air insulation board appears the sliding after installation, improve the stability of air insulation board installation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description is only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is the structural schematic diagram of the utility model;

[0022] Figure 2 It is the structural schematic diagram of the utility model Figure 1 It is the enlarged schematic diagram of structure in A place of the utility model;

[0023] Figure 3 It is the structural schematic diagram of air insulation board in the utility model;

[0024] Figure 4 It is the sectional structure schematic diagram of first steel pipe of the utility model.

[0025] The mark in the drawing is: 1, first steel pipe;2, air insulation board;3, second steel pipe;4, positioning ring;5, rubber sealing ring;6, first bolt;7, recess;8, second bolt;9, connecting portion;10, convex part;11, through -hole;12, sealing plate;13, internal epoxy coating;14, glass flake coating layer;15, clamping groove;16, welding groove;17, connecting ring. DETAILED DESCRIPTION

[0026] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts under the premise that no creative efforts are made, belong to the scope of protection of the present application.

[0027] The specific embodiment is a kind of anticorrosive steel pipe, its structural schematic diagram is as shown in Figure 1 And Figure 2 The anticorrosive steel pipe includes the first steel pipe 1 and the second steel pipe 3 fixed by welding each other, the end near the first steel pipe 1 and the second steel pipe 3 is fixedly sleeved with the positioning ring 4, the inner wall of two positioning rings 4 is fixedly provided with the connecting ring 17, the air insulation plate 2 is fixedly arranged between two connecting rings 17, the inner wall center position of the air insulation plate 2 is provided with the protruding part 10, the inner wall of the protruding part 10 is inlaidly fixed with the sealing plate 12 connected with the first steel pipe 1 and the second steel pipe 3 closely.

[0028] The outer wall of the positioning ring 4 is annularly arranged with a plurality of grooves 7, the second bolt 8 is inlaid in the groove 7, a plurality of second bolts 8 are respectively screwed into the screw hole formed in the outer wall of the first steel pipe 1 and the second steel pipe 3, two air insulation plates 2 are sleeved between the first steel pipe 1 and the second steel pipe 3, the sealing plate 12 on the protruding part on the inner wall of the air insulation plate 2 is connected with the welding part closely, and the air insulation plate 2 is kept fixed by the first bolt 6 on the connecting part 9, so as to protect the welding part of the steel pipe from air isolation.

[0029] As shown in Figure 3 And Figure 4 The outer wall center position of the connecting ring 17 is provided with the clamping groove 15, the rubber sealing ring 5 is inlaidly fixed in the clamping groove 15, the inner wall of the air insulation plate 2 is connected with the rubber sealing ring 5 closely, and the two ends of the two air insulation plates 2 are provided with the connecting part 9, the two ends of the connecting part 9 are provided with the through hole 11, the first bolt 6 is installed between the two through holes 11 on the same side, the first bolt 6 in the groove 7 keeps the positioning ring 4 fixed, the rubber sealing plate 12 is installed on the connecting ring 17 of the side wall of the positioning ring 4, the two ends of the air insulation plate 2 are connected with the rubber sealing plate 12 closely, further blocking the air, at the same time, the two ends of the air insulation plate 2 are connected with the positioning ring 4 closely, avoiding the sliding of the air insulation plate 2 after installation, the outer wall of the end near the first steel pipe 1 and the second steel pipe 3 is provided with the welding groove 16, and the outer wall of the first steel pipe 1 and the second steel pipe 3 is provided with the glass flake paint layer 14, wherein the first steel pipe 1 and the second steel pipe 3 are provided with the inner epoxy coating 13, the glass flake paint layer 14 and the inner epoxy coating 13 protect the first steel pipe 1 and the second steel pipe 3, and improve the anticorrosion effect of the first steel pipe 1 and the second steel pipe 3.

[0030] Working principle: when using the device of the technical solution, the first steel pipe 1 and the second steel pipe 3 are welded through the welding groove 16, and after welding, the two air isolation plates 2 are sleeved between the first steel pipe 1 and the second steel pipe 3, the sealing plate 12 on the inner wall convex part of the air isolation plate 2 is closely connected with the welding part, and the air isolation plate 2 is kept fixed through the first bolt 6 on the connecting part 9, the welded part of the steel pipe is protected from air, which greatly reduces the corrosion of the welded part of the steel pipe, the first bolt 6 in the recess 7 is tightened to keep the positioning ring 4 fixed, the connecting ring 17 on the side wall of the positioning ring 4 is provided with the rubber sealing plate 12, and the two ends of the air isolation plate 2 are closely connected with the rubber sealing plate 12, which further blocks the air, and at the same time, the two ends of the air isolation plate 2 are closely connected with the positioning ring 4, which avoids the sliding of the air isolation plate 2 after installation, and improves the stability of the installation of the air isolation plate 2.

[0031] All the technical features in the embodiment can be freely combined according to actual needs.

[0032] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. within the spirit and principles of the utility model, should be contained in the protection scope of the utility model.

Claims

1. A corrosion protected steel pipe comprising a first steel pipe (1) and a second steel pipe (3) fixed to each other by welding, characterized in that The first steel pipe (1) and the second steel pipe (3) are fixed with a positioning ring (4) at one end, the inner wall of the two positioning rings (4) is fixed with a connecting ring (17), the air insulation plate (2) is fixed between the two connecting rings (17), the inner wall of the air insulation plate (2) is provided with a protruding part (10) at the center position, and the inner wall of the protruding part (10) is embedded with a sealing plate (12) connected with the first steel pipe (1) and the second steel pipe (3).

2. A corrosion protected steel pipe according to claim 1, characterized in that The outer wall of the positioning ring (4) is provided with a plurality of grooves (7) in an annular array, and the second bolt (8) is embedded in the groove (7).

3. A corrosion protected steel pipe according to claim 2, characterized in that A plurality of the second bolts (8) are respectively screwed into the screw holes formed in the outer wall of the first steel pipe (1) and the second steel pipe (3).

4. A corrosion protected steel pipe according to claim 3, characterized in that The outer wall of the connecting ring (17) is provided with a clamping groove (15) at the center position, and the rubber sealing ring (5) is embedded in the clamping groove (15).

5. A corrosion protected steel pipe according to claim 4, characterized in that The inner wall of the air insulation plate (2) is tightly connected with the rubber sealing ring (5), and the two ends of the two air insulation plates (2) are provided with a connecting part (9).

6. A corrosion protected steel pipe according to claim 5, characterized in that The connecting part (9) is provided with a through hole (11) at both ends, and the first bolt (6) is installed between the two through holes (11) on the same side.

7. A corrosion protected steel pipe according to claim 1, characterized in that The outer wall of the first steel pipe (1) and the second steel pipe (3) is provided with a welding groove (16) at one end, and the outer wall of the first steel pipe (1) and the second steel pipe (3) is provided with a glass flake coating layer (14), and the first steel pipe (1) and the second steel pipe (3) are provided with an inner epoxy coating (13).

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