Connection structure for butt joint of copper alloy composite steel pipe

Abstract

This application discloses a connection structure for butt joints of copper alloy-lined composite steel pipes, comprising: two pipe bodies, one of which has a threaded inner liner at its end, and the other pipe body has a first threaded groove on its inner wall. The threaded inner liner is threadedly installed into the inner cavity of the other pipe body through the first threaded groove. Both pipe bodies have annular limiting plates on their outer walls, and fastening and locking cylinders are respectively provided on the opposite sides of the two annular limiting plates. The fastening cylinder slides on the outer wall of the pipe body and is threadedly installed on the outer walls of the two annular limiting plates. The connection structure proposed in this application achieves multiple layers of protection for the steel pipe connection by housing the connection point within the cavities of the fastening and locking cylinders. This prevents the connection point from being exposed to air, thus preventing damage and loosening due to environmental corrosion and collisions with debris, and improving the stability of the copper pipe connection.

Description

Technical Field

[0001] This utility model relates to copper pipe connection structures, specifically to a connection structure for butt joints of copper alloy-lined composite steel pipes. Background Technology

[0002] Copper-lined composite steel pipe is a bimetallic composite pipe made of an outer carbon steel or alloy steel base pipe and an inner copper alloy lining layer tightly bonded together through a special process. Its design makes full use of the advantages of the two materials. The outer steel pipe provides high strength and pressure resistance, ensuring the structural stability of the pipeline under high pressure environment, while the inner copper alloy lining layer provides excellent corrosion resistance, thermal conductivity and wear resistance, making it especially suitable for corrosive fluid transportation, heat exchange systems and high temperature environments.

[0003] However, most existing composite steel pipe butt joint structures are threaded joints, meaning that threads are installed at both ends of the rigid sections, and the pipes are joined by the threads. However, when using threads to connect steel pipes, the joint is exposed to air and is susceptible to environmental corrosion (rain, etc.) and impacts from debris, leading to damage and loosening of the joint. Therefore, there is an urgent need for a robust connection structure for butt joints of copper alloy-lined composite steel pipes. Utility Model Content

[0004] To overcome the aforementioned deficiencies of the prior art, this application provides a connection structure for butt joints of copper alloy-lined composite steel pipes. By setting fastening sleeves and locking sleeves, the steel pipe joints are protected in multiple ways, preventing them from being exposed to the air. This prevents the steel pipe joints from being easily damaged or loosened due to environmental corrosion and collisions with debris, thereby improving the stability of the copper pipe connection and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A connection structure for butt joints of copper alloy-lined composite steel pipes includes: two pipe bodies, one of which has a threaded inner liner at its end, and the other pipe body has a first threaded groove on its inner wall. The threaded inner liner is threaded into the inner cavity of the other pipe body through the first threaded groove. Both pipe bodies have annular limiting plates on their outer walls. A fastening cylinder and a locking cylinder are respectively provided on the opposite sides of the two annular limiting plates. The fastening cylinder slides on the outer wall of the pipe body and is threaded onto the outer wall of the two annular limiting plates. The locking cylinder slides on the outer wall of the pipe body and is threaded onto the outer wall of the fastening cylinder. A first annular end plate and a second annular end plate are respectively provided on the opposite sides of the fastening cylinder and the locking cylinder. Several limiting bolts are evenly distributed on the back of the second annular end plate, and these limiting bolts pass through the second annular end plate and the locking cylinder and are threaded into them.

[0007] Preferably, the inner wall of the fastening cylinder is provided with a second threaded groove, and the fastening cylinder is threaded onto the outer wall of the two annular limiting plates through the second threaded groove and closely attached to the end face of the second annular end plate.

[0008] Preferably, the end face of the first annular end plate is provided with a first through hole that communicates with the inner cavity of the fastening cylinder. The fastening cylinder and the first annular end plate slide on the outer wall of the tube through the first through hole, and the inner diameter of the first through hole is smaller than the diameter of the annular limiting plate.

[0009] Preferably, the inner wall of the locking cylinder is provided with a third threaded groove, and the locking cylinder is threaded onto the outer wall of the fastening cylinder through the third threaded groove and closely attached to the end face of the first annular end plate.

[0010] Preferably, the end face of the second annular end plate is provided with a second through hole that communicates with the inner cavity of the locking cylinder. The locking cylinder and the second annular end plate slide on the outer wall of the tube through the second through hole, and the inner diameter of the second through hole is smaller than the diameter of the annular limiting plate. The internal threads of the second thread groove are opposite in direction to the internal threads of the third thread groove.

[0011] Preferably, a sealing ring is provided on the inner wall of the tube at the end face of the first threaded groove, and the threaded inner liner is tightly attached to the end face of the first threaded groove through the sealing ring.

[0012] Preferably, a nut is provided at one end of the limiting bolt screw located on the back of the first annular end plate, and the nut is threaded onto the outer wall of the limiting bolt screw and tightly attached to the end face of the first annular end plate.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] By installing fastening and locking sleeves on the steel pipes, the joints are protected from exposure to air. This prevents the joints from being damaged or loosened due to environmental corrosion and impacts from debris. Furthermore, the fastening and locking sleeves provide multiple layers of fixation, enhancing the stability of the pipe connections. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a composite steel pipe connection according to an embodiment of the present invention;

[0017] Figure 2 This is a split schematic diagram of a composite steel pipe butt connection structure according to an embodiment of the present invention;

[0018] Figure 3 This is a perspective view of a fastening cylinder according to an embodiment of the present invention;

[0019] Figure 4 This is a perspective view of a locking cylinder according to an embodiment of the present invention.

[0020] In the diagram: 1. Pipe body; 101. First threaded groove; 11. Threaded inner liner; 12. Annular limiting plate; 13. Sealing ring; 2. Fastening cylinder; 201. Second threaded groove; 21. First annular end plate; 211. First through hole; 3. Locking cylinder; 301. Third threaded groove; 31. Second annular end plate; 311. Second through hole; 4. Limiting bolt; 41. Nut. Detailed Implementation

[0021] Combination Figures 1-4 As shown, in this embodiment, the connection structure for butt welding of copper alloy composite steel pipes includes: two pipe bodies 1, one of which is provided with a threaded inner liner 11 at its end, and the inner wall of the other pipe body 1 is provided with a first threaded groove 101. The threaded inner liner 11 is threadedly installed in the inner cavity of the other pipe body 1 through the first threaded groove 101. The threaded inner liner 11 is installed into the inner cavity of the pipe body 1 through the first threaded groove 101, thereby realizing the butt welding of the two steel pipes.

[0022] In this embodiment, annular limiting plates 12 are provided on the outer walls of both pipe bodies 1. Fastening cylinders 2 and locking cylinders 3 are respectively provided on the opposite sides of the two annular limiting plates 12. The fastening cylinder 2 slides on the outer wall of the pipe body 1 and is threaded onto the outer wall of the two annular limiting plates 12. The locking cylinder 3 slides on the outer wall of the pipe body 1 and is threaded onto the outer wall of the fastening cylinder 2. The fastening cylinder 2 and locking cylinder 3 are installed on the pipe body 1 in sequence, and the steel pipe connection is housed in the inner cavity of the fastening cylinder 2 and locking cylinder 3, preventing the steel pipe connection from being exposed to the air. This prevents the steel pipe connection from being easily damaged or loosened due to environmental corrosion and collision with debris when exposed to the air, thus achieving protection of the steel pipe connection.

[0023] In this embodiment, the inner wall of the fastening cylinder 2 is provided with a second threaded groove 201. The fastening cylinder 2 is threaded onto the outer wall of the two annular limiting plates 12 through the second threaded groove 201 and is tightly attached to the end face of the second annular end plate 31. The fastening cylinder 2 is threaded onto the outer wall of the two annular limiting plates 12 through the second threaded groove 201, thereby realizing the storage and protection of the steel pipe connection.

[0024] In this embodiment, the end face of the first annular end plate 21 is provided with a first through hole 211 that communicates with the inner cavity of the fastening cylinder 2. The fastening cylinder 2 and the first annular end plate 21 slide on the outer wall of the tube body 1 through the first through hole 211, and the inner diameter of the first through hole 211 is smaller than the diameter of the annular limiting plate 12. The fastening cylinder 2 slides on the outer wall of the tube body 1 through the first through hole 211, which facilitates the installation and removal of the fastening cylinder 2. At the same time, the position of the fastening cylinder 2 is limited by the annular limiting plate 12, which can prevent the fastening cylinder 2 from falling off the tube body 1.

[0025] In this embodiment, the inner wall of the locking cylinder 3 is provided with a third threaded groove 301. The locking cylinder 3 is threaded onto the outer wall of the fastening cylinder 2 through the third threaded groove 301 and is tightly attached to the end face of the first annular end plate 21. The locking cylinder 3 is threaded onto the outer wall of the fastening cylinder 2 through the third threaded groove 301, thereby achieving double protection for the steel pipe connection.

[0026] In this embodiment, the end face of the second annular end plate 31 is provided with a second through hole 311 that communicates with the inner cavity of the locking cylinder 3. The locking cylinder 3 and the second annular end plate 31 slide on the outer wall of the tube body 1 through the second through hole 311, and the inner diameter of the second through hole 311 is smaller than the diameter of the annular limiting plate 12. The internal thread of the second thread groove 201 is opposite to the internal thread of the third thread groove 301. The locking cylinder 3 slides on the outer wall of the tube body 1 through the second through hole 311, which facilitates the installation and removal of the locking cylinder 3. At the same time, the position of the locking cylinder 3 is limited by the annular limiting plate 12, which can prevent the locking cylinder 3 from falling off the tube body 1. Moreover, by screwing the locking cylinder 3 and the fastening cylinder 2 together outside the two annular limiting plates 12, the locking cylinder 3 and the fastening cylinder 2 are prevented from loosening, which improves the stability of the installation of the locking cylinder 3 and the fastening cylinder 2.

[0027] In this embodiment, a sealing ring 13 is provided on the inner wall of the tube body 1 at the end face of the first threaded groove 101, and the threaded inner liner tube 11 is tightly attached to the end face of the first threaded groove 101 through the sealing ring 13; the sealing ring 13 seals the gap between the threaded inner liner tube 11 and the tube body 1, improves the sealing performance of the tube body 1 connection, and prevents steel pipe leakage.

[0028] In this embodiment, a first annular end plate 21 and a second annular end plate 31 are respectively provided at the ends of the fastening cylinder 2 and the locking cylinder 3 that are far apart from each other. A plurality of limiting bolts 4 are evenly provided on the back of the second annular end plate 31. The limiting bolts 4 pass through the second annular end plate 31 and the locking cylinder 3 and are threaded inside them. A nut 41 is provided at the end of the limiting bolt 4 located on the back of the first annular end plate 21. The nut 41 is threaded on the outer wall of the limiting bolt 4 and is close to the end face of the first annular end plate 21. The first annular end plate 21 and the second annular end plate 31 are connected and fixed by the cooperation of the limiting bolts 4 and the nut 41, thereby realizing the assembly of the fastening cylinder 2 and the locking cylinder 3 and further improving the stability of the connection between the fastening cylinder 2 and the locking cylinder 3.

[0029] The working principle of this utility model is as follows: The connection structure for butt joint of copper alloy composite steel pipe proposed in this application, by setting fastening cylinder 2 and locking cylinder 3, installs fastening cylinder 2 and locking cylinder 3 on the steel pipe in sequence, and houses the steel pipe joint inside the cavity of fastening cylinder 2 and locking cylinder 3, preventing the steel pipe joint from being exposed to the air, thus preventing damage and loosening caused by environmental corrosion and collision with debris when the steel pipe joint is exposed to the air. This achieves protection of the steel pipe joint. At the same time, by screwing locking cylinder 3 and fastening cylinder 2 onto the steel pipe, it can also play a multiple fixing role for the steel pipe, improving the stability of the steel pipe joint.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A connecting structure for butt joining a composite steel pipe lined with a copper alloy, comprising: Two pipe bodies (1), characterized in that one of the pipe bodies (1) is provided with a threaded inner liner (11) at its end, and the inner wall of the other pipe body (1) is provided with a first threaded groove (101). The threaded inner liner (11) is threadedly installed in the inner cavity of the other pipe body (1) through the first threaded groove (101). Furthermore, the outer walls of both pipe bodies (1) are provided with annular limiting plates (12), and fastening cylinders (2) and locking cylinders (3) are respectively provided on the opposite sides of the two annular limiting plates (12). The fastening cylinder (2) slides on the... The outer wall of the tube body (1) is threaded onto the outer wall of the two annular limiting plates (12). The locking cylinder (3) slides on the outer wall of the tube body (1) and is threaded onto the outer wall of the fastening cylinder (2). The fastening cylinder (2) and the locking cylinder (3) are respectively provided with a first annular end plate (21) and a second annular end plate (31) at their ends that are far apart from each other. A number of limiting bolts (4) are evenly provided on the back of the second annular end plate (31). The limiting bolts (4) pass through the second annular end plate (31) and the locking cylinder (3) and are threaded onto their interiors.

2. The connection structure for butt joining of the lined copper alloy composite pipe according to claim 1, characterized by The inner wall of the fastening cylinder (2) is provided with a second threaded groove (201). The fastening cylinder (2) is threaded onto the outer wall of the two annular limiting plates (12) through the second threaded groove (201) and is in close contact with the end face of the second annular end plate (31).

3. The connection structure for butt welding of copper alloy-lined composite steel pipes according to claim 2, characterized in that, The end face of the first annular end plate (21) is provided with a first through hole (211) that communicates with the inner cavity of the fastening cylinder (2). The fastening cylinder (2) and the first annular end plate (21) slide on the outer wall of the tube body (1) through the first through hole (211), and the inner diameter of the first through hole (211) is smaller than the diameter of the annular limiting plate (12).

4. The connection structure for butt welding of copper alloy-lined composite steel pipes according to claim 2, characterized in that, The inner wall of the locking cylinder (3) is provided with a third threaded groove (301). The locking cylinder (3) is threaded onto the outer wall of the fastening cylinder (2) through the third threaded groove (301) and is in close contact with the end face of the first annular end plate (21).

5. The connection structure for butt welding of copper alloy-lined composite steel pipes according to claim 4, characterized in that, The end face of the second annular end plate (31) is provided with a second through hole (311) that communicates with the inner cavity of the locking cylinder (3). The locking cylinder (3) and the second annular end plate (31) slide on the outer wall of the tube body (1) through the second through hole (311). The inner diameter of the second through hole (311) is smaller than the diameter of the annular limiting plate (12). The internal thread of the second thread groove (201) is opposite to the internal thread of the third thread groove (301).

6. The connection structure for butt welding of copper alloy-lined composite steel pipes according to claim 1, characterized in that, The inner wall of the tube body (1) is provided with a sealing ring (13) at the end face of the first threaded groove (101), and the threaded inner liner tube (11) is tightly attached to the end face of the first threaded groove (101) through the sealing ring (13).

7. The connection structure for butt welding of copper alloy-lined composite steel pipes according to claim 1, characterized in that, The limiting bolt (4) has a nut (41) at one end on the back of the first annular end plate (21). The nut (41) is threaded onto the outer wall of the limiting bolt (4) and is in close contact with the end face of the first annular end plate (21).

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