Novel lining oil pipe anti-corrosion coupling

Abstract

The utility model discloses a novel anticorrosion coupling for a lining oil pipe, which belongs to the technical field of oil pipe couplings and comprises a coupling body, a lining ring is arranged in the coupling body, an inner convex surface is arranged on the inner side of the lining ring, a metal block is fixedly connected in the lining ring, a magnet is arranged on one side of the metal block, and a magnet is arranged on the other side of the metal block. The outer surface of the magnet is fixedly connected with the coupling body, and the inner wall of the magnet is fixedly connected with a fixing ring. According to the novel lining oil pipe anti-corrosion coupling, the lining ring is plugged into the tool withdrawal groove in the middle of the coupling body, the metal block in the lining ring is attracted by the magnet on the coupling body, the lining ring can easily enter the tool withdrawal groove, operation is easy, the effect of convenient installation is achieved, and when the lining ring needs to be disassembled, the lining ring can be detached conveniently and rapidly. And the extrusion rod is screwed to extrude the lining ring, so that the lining ring is separated from the tool withdrawal groove and then is taken out, and the effect of being convenient to disassemble is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pipe couplings, in particular to a novel lined oil pipe anti-corrosion coupling. Background Art

[0002] Oil pipes are specially designed for transporting oil during the oil extraction process and have high economic benefits. The oil pipes used in oil fields are generally composed of multiple pipes connected together, each about 9.5 meters long. Each pipe needs to be connected by a coupling to form a pipe column of several hundred to several thousand meters for easy use.

[0003] The existing oil pipe coupling has threads on the inner wall, which are connected to the two oil pipes through the threads. However, a certain space is reserved at the connection point of the two oil pipes, i.e., the roots of the two threads of the coupling, which is easy to retain impurities, thereby causing the threads to contact with corrosive media, resulting in aggravated thread corrosion. In order to solve the above problem, an anti-corrosion oil pipe coupling is often used, in which a raised sealing ring is provided between the connecting threads of the two oil pipes, and the end of the oil pipe is squeezed with the sealing ring to form a seal. Since the width of the sealing ring is difficult to control, it bulges during the tightening process of the oil pipe, resulting in a smaller inner diameter of the pipe, thereby affecting the operation of the tools in the pipe string.

[0004] After searching, a lined oil pipe coupling with announcement number CN203847015U is found, comprising a coupling body, wherein both ends of the coupling body are respectively provided with internal threads for connecting the oil pipe, and the ends corresponding to the two internal threads in the middle of the inner wall of the coupling body are provided with backing grooves, and an inner lining ring is fitted in the backing groove, and the axial middle part of the inner wall of the inner lining ring is provided with an inner convex surface equal to the inner diameter of the oil pipe to be connected, and the two sides of the inner convex surface are respectively provided with a conical surface matching the chamfer of the end face of the oil pipe and a biting surface screwed with the thread of the internal thread extending from the oil pipe, the thread corrosion protection is solved by adopting the bite mode of the thread and the inner lining ring, and the inner convex structure of the inner lining ring is used to fill the reserved space between the two oil pipes, so that an inner lining ring has the dual functions of sealing the thread and filling the reserved space of the coupling body, which simplifies the lining method, saves costs, improves production efficiency, and solves the above-mentioned problems.

[0005] Although the above scheme fills the reserved space between the oil pipes tightly to make the inner diameter of the oil pipe basically consistent with the inner diameter of the lined oil pipe coupling, effectively preventing the medium in the pipe from corroding the exposed oil pipe threads and foreign matter from being retained in the reserved space at the connection between the two oil pipes, the liner ring needs to be installed before use. Since the liner ring is stuck in the inside of the back-cut groove and is located in the middle position of the coupling body, it is not convenient to install. Tools are needed to insert the liner ring. In addition, when the liner ring needs to be replaced and disassembled later, it is not convenient to disassemble. In order to solve this technical problem, the utility model proposes a new type of lined oil pipe anti-corrosion coupling. Utility Model Content

[0006] The main purpose of the utility model is to provide a novel lined oil pipe anti-corrosion coupling, which can effectively solve the problems mentioned in the background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A novel lined oil pipe anti-corrosion coupling comprises a coupling body, an inner lining ring is arranged inside the coupling body, an inner convex surface is arranged on the inner side of the inner lining ring, a metal block is fixedly connected to the inside of the inner lining ring, a magnet is arranged on one side of the metal block, the outer surface of the magnet is fixedly connected to the coupling body, a fixing ring is fixedly connected to the inner wall of the magnet, an extrusion rod is threadedly connected to the inner wall of the fixing ring, and a protective mechanism is arranged on the outer surface of the coupling body.

[0009] Preferably, the protection mechanism comprises a fixing plate, the inner side of the fixing plate is fixedly connected to the coupling body, and the cross-sectional shape of the fixing plate is F-shaped.

[0010] Preferably, the upper portion of the fixed plate is slidably connected to a movable plate, the coupling body is provided with fixing threads around the movable plate, and the lower portion of the movable plate is movably connected to the fixing threads.

[0011] Preferably, a knob is fixedly connected to the end of the extrusion rod, and the extrusion rod and the knob are both located inside the movable plate.

[0012] Preferably, a support frame is installed at the lower part of the coupling body, there are two support frames, and the lower surface of the support frame is lower than the bottom end of the fixing plate.

[0013] Preferably, the outer surface of the inner liner ring is provided with a smooth surface, and the outer surface of the magnet is in contact with the smooth surface.

[0014] Preferably, a first thread is provided at a position of the coupling body located on one side of the inner liner ring, and a second thread is provided at a position of the coupling body located on the other side of the inner liner ring.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] In the utility model, by arranging components such as a metal block and an extrusion rod, when installing the inner liner ring, the inner liner ring is inserted into the back cut groove in the middle part of the coupling body, and the metal block inside the inner liner ring is attracted by the magnet on the coupling body, so that the inner liner ring can easily enter the back cut groove. The operation is relatively simple, and the effect of easy installation is achieved. When the inner liner ring needs to be disassembled, the extrusion rod is twisted to make the extrusion rod squeeze the inner liner ring, thereby separating the inner liner ring from the back cut groove, and then the inner liner ring is taken out, achieving the effect of easy disassembly.

[0017] In the utility model, by providing components such as an inner lining ring and a protective mechanism, the first thread and the second thread are respectively connected to the oil pipe. After the oil pipe is screwed on, the ends of the two oil pipes respectively squeeze the inner convex surface on the inner lining ring to fix it. The inner lining ring and the inner convex surface increase the sealing effect and prevent the thread from being corroded. The movable plate isolates the multiple extrusion rods from the outside world, thereby protecting the multiple extrusion rods to prevent the extrusion rods from accidentally rotating under the influence of the outside world, thereby affecting the use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the new type of lined oil pipe anti-corrosion coupling of the utility model;

[0019] Figure 2 It is a cross-sectional view of the movable plate in the new type of anti-corrosion coupling of the inner-lined oil pipe of the utility model;

[0020] Figure 3 It is a cross-sectional view of the coupling body in the new type of lined oil pipe anti-corrosion coupling of the utility model;

[0021] Figure 4 It is a cross-sectional view of a magnet in a novel anti-corrosion coupling of an inner-lined oil pipe according to the utility model;

[0022] Figure 5 It is a cross-sectional view of the lining ring in the new type of lined oil pipe anti-corrosion coupling of the utility model.

[0023] In the figure: 1. coupling body; 2. inner lining ring; 3. inner convex surface; 4. metal block; 5. magnet; 6. fixing ring; 7. extrusion rod; 8. protection mechanism; 801. fixing plate; 802. movable plate; 803. fixing thread; 9. knob; 10. support frame; 11. smooth surface; 12. first thread; 13. second thread. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] like Figure 1-5 As shown, a new type of lined oil pipe anti-corrosion coupling includes a coupling body 1, an inner lining ring 2 is arranged inside the coupling body 1, the material of the inner lining ring 2 is rubber, and it can be bent. An oblique opening is arranged on the inner lining ring 2, and a first thread 12 is arranged at a position of the coupling body 1 on one side of the inner lining ring 2, and a second thread 13 is arranged at a position of the coupling body 1 on the other side of the inner lining ring 2. The coupling body 1 can be connected to the oil pipe through the first thread 12 and the second thread 13 respectively.

[0026] An inner convex surface 3 is provided on the inner side of the inner lining ring 2, and the inner diameter of the inner convex surface 3 is the same as the inner diameter of the oil pipe. When the oil pipe is fixed on the coupling body 1, the inside of the oil pipe is flush with the inner convex surface 3. A metal block 4 is fixedly connected to the inside of the inner lining ring 2. There are multiple metal blocks 4. Magnets 5 are provided on one side of the metal block 4. The number of magnets 5 is the same as that of the metal blocks 4. A smooth surface 11 is provided on the outer surface of the inner lining ring 2. The outer surface of the magnet 5 is in contact with the smooth surface 11. A toothed locking mouth is provided on the portion of the inner lining ring 2 located outside the smooth surface 11. The outer surface of the magnet 5 is fixedly connected to the coupling body 1. A fixing ring 6 is fixedly connected to the inner wall of the magnet 5. An extrusion rod 7 is threadedly connected to the inner wall of the fixing ring 6. When the extrusion rod 7 rotates, the position of the extrusion rod 7 can be adjusted. The number of the extrusion rod 7, the fixing ring 6 and the magnet 5 is the same as that of the metal block 4.

[0027] A protective mechanism 8 is provided on the outer surface of the coupling body 1, and the protective mechanism 8 includes a fixed plate 801. The inner side of the fixed plate 801 is fixedly connected to the coupling body 1. The cross-sectional shape of the fixed plate 801 is F-shaped. The upper part of the fixed plate 801 is slidably connected with a movable plate 802. The coupling body 1 is provided with a fixed thread 803 around the movable plate 802. The lower part of the movable plate 802 is movably connected with the fixed thread 803. The multiple extrusion rods 7 are isolated from the outside world by the fixed plate 801, thereby protecting the multiple extrusion rods 7 to prevent the extrusion rods 7 from accidentally rotating under the influence of the outside world, thereby affecting the use.

[0028] A knob 9 is fixedly connected to the end of the extrusion rod 7. Each extrusion rod 7 is provided with a knob 9, which is used to facilitate the turning of the extrusion rod 7. The extrusion rod 7 and the knob 9 are both located inside the movable plate 802. A support frame 10 is installed at the lower part of the coupling body 1. There are two support frames 10. The lower surface of the support frame 10 is lower than the bottom end of the fixed plate 801. The support frame 10 is used to support the coupling body 1 and prevent the fixed plate 801 from contacting the ground.

[0029] It should be noted that in actual use, the device is connected to the oil pipe through the first thread 12 and the second thread 13 respectively. After the oil pipe is screwed on, the ends of the two oil pipes respectively squeeze the inner convex surface 3 on the inner liner ring 2 to fix it. The inner liner ring 2 and the inner convex surface 3 increase the sealing effect and prevent the thread from being corroded.

[0030] When installing the inner lining ring 2 before installation, bend the inner lining ring 2 and then insert it into the back-cut groove in the middle of the coupling body 1. The metal block 4 inside the inner lining ring 2 is attracted by the magnet 5 on the coupling body 1, so that the inner lining ring 2 can easily enter the back-cut groove. The operation is relatively simple, and the effect of easy installation is achieved. After long-term use, when the coupling body 1 is to be recovered, the inner lining ring 2 needs to be replaced. First, the movable plate 802 is twisted to move the movable plate 802 away from the fixed plate 801, thereby leaking multiple extrusion rods 7. The extrusion rod 7 is twisted to move the extrusion rod 7 close to the smooth surface 11. The extrusion rod 7 squeezes the smooth surface 11 to move the metal block 4 away from the magnet 5, thereby separating the inner lining ring 2 from the back-cut groove, and then the inner lining ring 2 is taken out, achieving the effect of easy disassembly.

[0031] After use, the movable plate 802 is twisted in the reverse direction to make one side of the movable plate 802 close to the fixed plate 801, thereby isolating the multiple extrusion rods 7 from the outside world, thereby protecting the multiple extrusion rods 7 to prevent the extrusion rods 7 from accidentally rotating under the influence of the outside world, thereby affecting use.

[0032] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A novel anti-corrosion coupling for lined oil pipe, comprising a coupling body (1), characterized in that: An inner lining ring (2) is arranged inside the coupling body (1), an inner convex surface (3) is arranged on the inner side of the inner lining ring (2), a metal block (4) is fixedly connected to the inside of the inner lining ring (2), a magnet (5) is arranged on one side of the metal block (4), the outer surface of the magnet (5) is fixedly connected to the coupling body (1), a fixing ring (6) is fixedly connected to the inner wall of the magnet (5), an extrusion rod (7) is threadedly connected to the inner wall of the fixing ring (6), and a protective mechanism (8) is arranged on the outer surface of the coupling body (1).

2. The novel lined oil pipe anti-corrosion coupling according to claim 1 is characterized in that: The protection mechanism (8) comprises a fixing plate (801), the inner side of which is fixedly connected to the coupling body (1), and the cross-sectional shape of the fixing plate (801) is F-shaped.

3. The novel lined oil pipe anti-corrosion coupling according to claim 2 is characterized in that: The upper part of the fixed plate (801) is slidably connected to a movable plate (802), the coupling body (1) is provided with a fixing thread (803) around the movable plate (802), and the lower part of the movable plate (802) is movably connected to the fixing thread (803).

4. The novel anti-corrosion coupling for lined oil pipe according to claim 3 is characterized by: The end of the squeezing rod (7) is fixedly connected to a knob (9), and the squeezing rod (7) and the knob (9) are both located inside the movable plate (802).

5. The novel lined oil pipe anti-corrosion coupling according to claim 4 is characterized in that: A support frame (10) is installed at the lower part of the coupling body (1), and there are two support frames (10). The lower surface of the support frame (10) is lower than the bottom end of the fixing plate (801).

6. The novel anti-corrosion coupling for lined oil pipe according to claim 5 is characterized by: The outer surface of the inner lining ring (2) is provided with a smooth surface (11), and the outer surface of the magnet (5) is in contact with the smooth surface (11).

7. The novel anti-corrosion coupling for lined oil pipe according to claim 6 is characterized by: The coupling body (1) is provided with a first thread (12) at a position located on one side of the inner liner ring (2), and the coupling body (1) is provided with a second thread (13) at a position located on the other side of the inner liner ring (2).

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