Double-sided composite steel plate welded steel pipe

Abstract

The utility model relates to a double-faced composite steel plate welded steel pipe which comprises a first steel plate and a second steel plate which are composited, the left end and the right end of the first steel plate and the left end and the right end of the second steel plate are staggered, and the left end and the right end of the first steel plate are circularly curled and welded to form an inner circular pipe. The left end and the right end of the second steel plate are circularly curled and welded to form an outer circular pipe, the outer circular pipe is located on the outer side of the inner circular pipe, the inner circular pipe is provided with a first welding seam, the outer circular pipe is provided with a second welding seam, and the first welding seam and the second welding seam are staggered. The first steel plate and the second steel plate between the first welding seam and the second welding seam are compounded and fixed, the first welding seam and the second welding seam are staggered, stress concentration points are effectively dispersed, and the risk of leakage of the whole pipe caused by failure of a single welding seam is reduced. And even if the welding seam on the inner circular pipe leaks, the medium cannot be in contact with the welding seam of the outer circular pipe, so that the design greatly prevents the medium from leaking, and the safety and the reliability of the steel pipe are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe technical field, especially a double -faced composite steel sheet welded steel pipe. BACKGROUND

[0002] The double -faced composite steel sheet welded steel pipe has been widely used in the field of high material performance requirement such as petroleum chemical industry, ocean engineering, electric power because it can combine the advantages of different materials, such as the corrosion resistance of the inner layer and the high strength of the outer layer. In the manufacturing process of this kind of steel pipe, first, two or more steel plates are compounded according to the required structure, then the composite plate is curled into a round pipe shape, and the edges are connected by welding, and finally the steel pipe is formed.

[0003] Although the double -faced composite steel sheet welded steel pipe has many advantages, but in practical application, the weld is still a potential weak point of its structural integrity. Most of the existing double -faced composite steel sheet welded steel pipe does not fully consider the optimization layout of the weld and the fine protection of the inner tube wall. In the common design, the inner and outer tube wall welds are often in the same section, which greatly increases the risk of weld defect superposition. Once a small flaw occurs in the weld, under high pressure, corrosion and other working conditions, it is easy to cause a chain reaction, leading to the failure of the entire weld system and the rapid rise of the leakage risk. Therefore, in view of the above technical problems, the present application makes improvements, UTILITY MODEL CONTENTS

[0004] The utility model provides a double -faced composite steel sheet welded steel pipe, solves the above -mentioned problems existing in the using process in the prior art.

[0005] The technical scheme of the utility model is realized as follows: a double -faced composite steel sheet welded steel pipe, including the first steel plate and the second steel plate that are compounded, the left and right ends of the first steel plate and the second steel plate are staggered, the left and right ends of the first steel plate are curled and welded into an inner circular pipe in a circular shape, the left and right ends of the second steel plate are curled and welded into an outer circular pipe in a circular shape, the outer circular pipe is located on the outer side of the inner circular pipe, the inner circular pipe has a first weld, the outer circular pipe has a second weld, the first weld and the second weld are staggered, and the first steel plate and the second steel plate between the first weld and the second weld are compounded and fixed.

[0006] Preferably, the inner side of the inner circular pipe is provided with a protective lining.

[0007] Preferably, the two ends of the protective lining include an extension ring piece extending to cover the end of the inner circular pipe and the outer circular pipe, a clamping groove is formed at the two end positions between the inner circular pipe and the outer circular pipe, and a connecting piece is inserted into the clamping groove in an interference fit on the extension ring piece.

[0008] Preferably, flanges are fixedly connected to the two ends of the outer circular pipe, and a sealing convex ring is integrally formed on the extension ring piece.

[0009] Preferably, the outer side of the outer circular pipe is wrapped with a protective plate.

[0010] Preferably, the left and right ends of the protective plate are circularly curled outside the outer circular pipe, one end of the protective plate is pressed between the other end and the outer circular pipe, and a fixing mechanism for fixing the left and right ends is arranged on the protective plate.

[0011] Preferably, the fixing mechanism comprises an upper connecting column and a lower connecting column, the left and right ends of the protective plate are fixedly connected with ring pipe sleeves, the upper connecting column and the lower connecting column are respectively inserted into the ring pipe sleeves on the left and right ends of the protective plate, and a screw rod is radially and threadedly connected between the upper connecting column and the lower connecting column.

[0012] The beneficial effects of the present application are as follows:

[0013] 1. The first weld and the second weld are staggered, effectively dispersing the stress concentration point and reducing the risk of single weld failure causing the whole pipe to leak. Even if a small defect occurs in one weld, it will not immediately cause the overall structure to be damaged. For example, even if the weld on the inner circular pipe leaks, the medium will not contact the weld on the outer circular pipe. This design greatly prevents medium leakage and improves the safety and reliability of the steel pipe.

[0014] 2. The protective lining is additionally arranged inside the inner circular pipe to provide an additional barrier layer to prevent the conveying medium from directly contacting the weld, significantly reducing the risk of corrosion and wear and tear, and prolonging the service life of the steel pipe.

[0015] 3. The connecting piece on the extension ring is inserted into the clamping groove in interference, which not only reinforces the position of the protective lining, but also forms a sealing structure, further improving the anti-leakage performance, and facilitating installation, disassembly and maintenance. The flanges fixed at both ends of the outer circular pipe facilitate connection with other pipeline components, and the integrally formed sealing convex ring on the extension ring enhances the sealing performance of the interface, ensuring that the connection part is leak-proof and improving the safety of the entire system.

[0016] 4. The protective plate is wrapped outside the outer circular pipe to provide an additional physical protection layer to prevent damage to the surface of the steel pipe caused by the external environment BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a side view of the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross-section structure in the AA direction;

[0021] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure in CC direction;

[0022] Figure 5 This is a schematic diagram of the explosion structure of the utility model.

[0023] In the figure: 10, first steel plate; 11, inner tube; 12, first weld; 20, second steel plate; 21, outer tube; 22, second weld; 3, slot; 4, flange; 5, protective lining; 51, extension ring; 52, connecting plate; 53, sealing convex ring; 61, protective plate; 62, upper connecting column; 63, lower connecting column; 64, annular pipe sleeve; 65, screw. DETAILED DESCRIPTION

[0024] The following is a combination of the appended examples of the present invention Figures 1-5 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Example:

[0026] like Figures 1 to 5 As shown, the utility model discloses a double-sided composite steel plate welded steel pipe, comprising a composite first steel plate 10 and a second steel plate 20, wherein the left and right ends of the first steel plate 10 and the second steel plate 20 are staggered, the left and right ends of the first steel plate 10 are circularly curled and welded to form an inner circular tube 11, and the left and right ends of the second steel plate 20 are circularly curled and welded to form an outer circular tube 21, the outer circular tube 21 is located outside the inner circular tube 11, and has a first weld 12 on the inner circular tube 11, and has a second weld 22 on the outer circular tube 21, the first weld 12 and the second weld 22 are staggered, and the first steel plate 10 and the second steel plate 20 are compositely fixed between the first weld 12 and the second weld 22.

[0027] The manufacturing steps of the utility model are as follows:

[0028] 1. Material preparation: Select the first steel plate 10 (such as corrosion-resistant stainless steel) and the second steel plate 20 (such as high-strength carbon steel or low-alloy steel) suitable for application requirements.

[0029] 2. Compound processing: According to the selected method (such as explosive welding, rolling composite, etc.), the first steel plate 10 and the second steel plate 20 are metallurgically combined or mechanically connected to form a double-sided composite plate, and the left and right ends of the first steel plate 10 and the second steel plate 20 are staggered.

[0030] 3. Cutting and pretreatment: The composite plate is accurately cut according to the design size, and the cutting edge is polished to remove burrs and irregularities to ensure smoothness during curling.

[0031] 4. Curling and preliminary welding: The first steel plate 10 and the second steel plate 20 are curled into a circular tube shape, the left and right ends of the first steel plate 10 are aligned, and the left and right ends of the second steel plate 20 are aligned, and then welded.

[0032] 5. Circular correction: The inner circular tube 11 and the outer circular tube 21 that have been welded are corrected for circularity using special tools to ensure accurate geometry and provide a good foundation for subsequent compounding.

[0033] 6. Final composite fixation: Select the appropriate compounding method for the first steel plate 10 and the second steel plate 20 between the first weld 12 and the second weld 22: Use a hydraulic press or other pressure equipment to apply sufficient pressure under low temperature conditions to make the first steel plate 10 and the second steel plate 20 tightly fit and form a firm mechanical connection. Or use high-performance structural adhesive or epoxy resin to fill the first steel plate 10 and the second steel plate 20 between the first weld 12 and the second weld 22, and then press tightly, and realize compounding after the adhesive is cured.

[0034] 7. Ensure the quality of the composite: After completing the compounding process, ultrasonic testing or X-ray detection can be performed.

[0035] The first weld 12 and the second weld 22 are staggered in the utility model, effectively dispersing the stress concentration point, reducing the risk of single weld failure causing the entire pipe to leak. Even if a small defect occurs in the weld, it will not immediately cause the overall structure to be damaged. For example, even if the weld on the inner circular tube 11 leaks, the medium will not contact the weld on the outer circular tube 21. This design greatly prevents medium leakage and improves the safety and reliability of the steel pipe.

[0036] In the utility model, in order to prevent the conveying medium from directly contacting the weld, the risk of corrosion and wear is significantly reduced, the service life of the steel pipe is prolonged, and the inner side of the inner circular tube 11 is provided with a protective lining 5 made of EPDM rubber.

[0037] Further, the two ends of the protective lining 5 are provided with extension ring plates 51 extending over the ends of the inner pipe 11 and the outer pipe 21, and the inner pipe 11 and the outer pipe 21 are provided with clamping grooves 3 at the two end positions, wherein the extension ring plates 51 are provided with connecting plates 52 inserted into the clamping grooves 3 in an interference fit, and the connecting plates 52 of the extension ring plates 51 are inserted into the clamping grooves 3 in an interference fit, which not only reinforces the position of the protective lining 5, but also forms a sealing structure, further improves the anti-leakage performance, and facilitates installation, disassembly and maintenance.

[0038] Further, the two ends of the outer pipe 21 are fixedly connected with flanges 4, and the extension ring plates 51 are integrally formed with sealing convex rings 53, the flanges 4 fixedly connected with the two ends of the outer pipe 21 facilitate connection with other pipeline components, and the integrally formed sealing convex rings 53 of the extension ring plates 51 enhance the sealing performance of the interface, ensure that the connection part is leak-proof, and improve the safety of the entire system.

[0039] In the utility model, the outer side of the outer pipe 21 is covered and wrapped with a protective plate 61, the protective plate 61 can be made of a galvanized steel plate or a corrosion-resistant coated metal plate, and the protective plate 61 provides an additional physical protection layer to prevent damage to the surface of the steel pipe caused by the external environment.

[0040] The left and right ends of the protective plate 61 are circularly curled and wrapped outside the outer pipe 21, and one end of the protective plate 61 is pressed and held between the other end and the outer pipe 21, which ensures that the protective plate 61 is tightly wrapped around the outer pipe 21, and a fixing mechanism for fixing the left and right ends is arranged on the protective plate 61. The fixing mechanism specifically comprises an upper connecting column 62 and a lower connecting column 63, the left and right ends of the protective plate 61 are fixedly connected with ring pipe sleeves 64, the upper connecting column 62 and the lower connecting column 63 are respectively inserted into the ring pipe sleeves 64 on the left and right ends of the protective plate 61, and the upper connecting column 62 and the lower connecting column 63 are radially screw-connected with a screw rod 65. By radially screw-connecting the upper connecting column 62 and the lower connecting column 63, the left and right ends of the protective plate 61 can be firmly fixed together, which not only ensures the connection strength but also facilitates adjustment and disassembly, thereby providing convenience for subsequent maintenance.

[0041] It should be pointed out that the terms indicated in the utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the utility model.

[0042] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-welded steel pipe of a clad steel plate characterized by: The utility model provides a first steel sheet and second steel sheet are compounded, the left and right ends of first steel sheet and second steel sheet are staggered, the left and right ends of first steel sheet are circularly curled and welded to form an inner circular pipe, the left and right ends of second steel sheet are circularly curled and welded to form an outer circular pipe, the outer circular pipe is located outside the inner circular pipe, the inner circular pipe has a first weld, the outer circular pipe has a second weld, the first weld and the second weld are staggered, and the first steel sheet and the second steel sheet are fixedly combined between the first weld and the second weld.

2. The double-walled composite steel pipe according to claim 1, characterized in that: The inner side of the inner circular pipe is provided with a protective lining.

3. The double-walled composite steel pipe according to claim 2, characterized in that: The two ends of the protective lining include an extension ring piece extending to cover the end of the inner circular pipe and the outer circular pipe, a clamping groove is formed at the two end positions between the inner circular pipe and the outer circular pipe, and a connecting piece is inserted into the clamping groove in an interference fit.

4. The double-walled composite steel pipe according to claim 3, characterized in that: A flange is fixedly connected to the two ends of the outer circular pipe, and a sealing convex ring is integrally formed on the extension ring piece.

5. The double-walled composite steel pipe according to claim 1, characterized in that: The outer side of the outer circular pipe is covered with a protective plate.

6. A double-submerged-arc welded steel pipe according to claim 5, characterized in that: The left and right ends of the protective plate are circularly curled to wrap the outer circular pipe, one end of the protective plate is pressed between the other end and the outer circular pipe, and a fixing mechanism is arranged on the protective plate to fix the left and right ends.

7. A double- welded steel pipe of a clad steel plate according to claim 6, characterized by: The fixing mechanism includes an upper connecting column and a lower connecting column, a ring pipe sleeve is fixedly connected to the left and right ends of the protective plate, the upper connecting column and the lower connecting column are respectively inserted into the ring pipe sleeves on the left and right ends of the protective plate, and a screw rod is radially screwed between the upper connecting column and the lower connecting column.

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