A new type of anti-corrosion coupling for lined oil pipe

Abstract

The present invention relates to the technical field of oil pipe couplings, and specifically to a novel lined oil pipe anti-corrosion coupling, comprising a coupling body, an inner lining ring and an extrusion structure. A back-knife groove is arranged inside the coupling body, and both ends of the coupling body are threadedly connected to the corresponding oil pipe. The inner lining ring is placed in the back-knife groove and is made of rubber. An inner convex surface is arranged on the inner side of the inner lining ring. A plurality of guide cylinders are arranged on the groove wall of the back-knife groove, and an extrusion rod is slidably installed in the guide cylinder. The extrusion structure comprises a fixed cover and a movable cover. A sliding wedge is slidably installed in the fixed cover, and the sliding wedge is used for sliding connection with the inclined surface in the extrusion rod. The sliding wedge is transmission-connected to the end face of the movable cover through a transmission component. When the inner lining ring needs to be disassembled, the extrusion rod is twisted to make the extrusion rod squeeze the inner lining ring, thereby disengaging the inner lining ring from the back-knife groove, which is convenient for disassembly of the inner lining ring.

Description

Technical Field

[0001] The invention 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 trapped in the reserved space at the connection between the two oil pipes, the inner liner ring needs to be installed before use. Since the inner 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 inner liner ring. In addition, when the inner liner ring needs to be replaced and disassembled later, it is not convenient to disassemble it. Summary of the invention

[0006] The purpose of the present invention is to provide a new type of lined oil pipe anti-corrosion coupling, which is used to solve the problem that the existing liner ring is not easy to load and unload because it is stuck inside the back cut groove inside the coupling body and is located in the middle of the coupling body.

[0007] To achieve the above object, the present invention provides a novel lined oil pipe anti-corrosion coupling, comprising:

[0008] A coupling body, wherein a cutter groove is arranged inside the coupling body, and inner walls of the coupling body on both sides of the cutter groove are correspondingly provided with a first thread and a second thread, wherein the first thread and the second thread are used for threaded connection with a corresponding oil pipe;

[0009] The inner liner ring is placed in the knife-back groove and is made of rubber. The inner side of the inner liner ring is provided with an inner convex surface. The inner diameter of the inner convex surface is the same as the inner diameter of the oil pipe. The groove wall of the knife-back groove is provided with multiple sets of guide cylinders. An extrusion rod is slidably installed in the guide cylinder. The outer end of the extrusion rod is elastically connected to the outer wall of the coupling body through an elastic member. A connecting groove is provided in the extrusion rod. A transmission inclined surface is installed in the connecting groove.

[0010] The extrusion structure comprises a fixed cover and a movable cover, wherein the fixed cover is fixedly mounted on the outside of the coupling body, the movable cover is threadedly connected to one side of the coupling cover, one end of the fixed cover is provided with an opening for the movable cover to be rotatably inserted, a sliding wedge is slidably mounted in the fixed cover, the sliding wedge is used to be slidably connected with the inclined surface in the extrusion rod, the sliding wedge is transmission-connected with the end surface of the movable cover through a transmission assembly, and the sliding wedge is driven to move linearly by the threaded rotation of the movable cover;

[0011] When the sliding wedge is linearly inserted into the communicating groove provided in the extrusion rod, the extrusion rod is forced to be inserted into the coupling body.

[0012] As a further solution of the present invention, a limiting arc block abutting against the inner wall of the fixed cover is provided at the top end of the extrusion rod.

[0013] As a further solution of the present invention, a group of support springs are respectively connected to both ends of the limiting arc block, and the two groups of support springs are elastically connected to the outer wall of the coupling body.

[0014] As a further solution of the present invention, the transmission assembly includes a fixing ring, a positioning column and a transmission guide groove;

[0015] Wherein, the fixed ring is coaxially mounted on the outer wall of the movable cover and is located inside the fixed cover;

[0016] The positioning column is fixedly mounted on the inner side of the opening end panel of the fixed cover, and a driving block is slidably mounted on the positioning column;

[0017] The transmission guide groove is fixedly connected to the driving block, and a sliding groove slidably connected to the fixing ring is arranged therein, and the transmission guide groove is fixedly connected to the sliding wedge block through a connecting piece.

[0018] As a further solution of the present invention, the connecting member is a connecting plate bracket.

[0019] As a further solution of the present invention, a plurality of support frames are installed at the lower part of the coupling body, and the coupling body is supported by the support frames.

[0020] As a further solution of the present invention, a handle for a person to hold and rotate is provided on the outer side of the movable cover.

[0021] Compared with the prior art, the present invention provides components such as an inner liner ring and an extrusion structure, and the first thread and the second thread at both ends of the coupling body 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 liner ring to fix it. The inner liner ring and the inner convex surface increase the sealing effect and prevent the thread from being corroded. The movable cover and the fixed cover isolate 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.

[0022] When the liner ring needs to be disassembled, the movable cover is driven, and the extrusion rod is forced to be inserted into the coupling body. The transmission drives the extrusion rod to be inserted into the coupling body, so that the extrusion rod squeezes the liner ring, thereby separating the liner ring from the retreat groove, and then the liner ring is taken out, achieving the effect of easy disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a novel anti-corrosion coupling for lined oil pipe in the present invention.

[0024] Figure 2 It is a structural diagram of the external part of the coupling body in the present invention.

[0025] Figure 3 For the present invention Figure 1 A magnified schematic diagram of center A.

[0026] Figure 4 This is a diagram of the internal structure of the fixed cover in the present invention.

[0027] Figure 5 It is a structural schematic diagram of the transmission component in the present invention.

[0028] Figure 6 For the present invention Figure 4 A magnified schematic diagram of point B in the middle.

[0029] Figure 7 It is a schematic diagram of the structure of the liner ring in the present invention.

[0030] In the accompanying drawings: 1. Coupling body; 101. External thread; 102. Back-off groove; 2. Fixed cover; 3. Movable cover; 4. Support frame; 5. Oil pipe; 6. Handle; 7. Liner ring; 8. Guide cylinder; 9. Extrusion rod; 901. Connecting groove; 10. Limiting arc block; 11. Support spring; 12. Drive block; 13. Transmission guide groove; 131. Sliding groove; 14. Fixed ring; 15. Positioning column; 16. Connecting bracket; 17. Sliding wedge block. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] like Figures 1 to 7 As shown, in an embodiment of the present invention, a novel lined oil pipe anti-corrosion coupling comprises a coupling body 1, in which a backslash groove 102 is arranged, and the inner walls of the coupling body 1 located on both sides of the backslash groove 102 are correspondingly provided with a first thread and a second thread, and the first thread and the second thread are used for threaded connection with the corresponding oil pipe 5; an inner lining ring 7 is placed in the backslash groove 102, which is made of rubber material, and an inner convex surface is arranged on the inner side, and the inner diameter of the inner convex surface is the same as the inner diameter of the oil pipe 5, and a plurality of groups of guide cylinders 8 are arranged on the groove wall of the backslash groove 102, and an extrusion rod 9 is slidably installed in the guide cylinder 8, and the outer end of the extrusion rod 9 is elastically connected to the outer wall of the coupling body 1 through an elastic member, and a connecting groove 901 is arranged in the extrusion rod 9, and the connecting groove 9 01 is installed with a transmission inclined surface; the extrusion structure includes a fixed cover 2 and a movable cover 3, the fixed cover 2 is fixedly installed on the outside of the coupling body 1, the movable cover 3 is threadedly connected to the external thread 101 on one side of the coupling cover, one end of the fixed cover 2 is provided with an opening for the movable cover 3 to be rotated and inserted, a sliding wedge 17 is slidably installed in the fixed cover 2, the sliding wedge 17 is used to be slidably connected with the inclined surface in the extrusion rod 9, the sliding wedge 17 is connected with the end face of the movable cover 3 through the transmission assembly, and the movable cover 3 is threadedly rotated to drive the sliding wedge 17 to move linearly; when the sliding wedge 17 is linearly inserted into the connecting groove 901 set in the extrusion rod 9, the extrusion rod 9 is forced to be inserted into the coupling body 1;

[0033] When installing the inner liner ring 7, the inner liner ring 7 is bent and then inserted into the back cut groove 102 in the middle of the coupling body 1, so that the inner liner ring 7 can easily enter the back cut groove 102, the operation is relatively simple, and the effect of easy installation is achieved;

[0034] After long-term use, when the coupling body 1 is to be recovered, the lining ring 7 needs to be replaced, the operation is released, the movable cover 3 in the extrusion structure is rotated, and the transmission drives the multiple groups of sliding wedges 17 in the fixed cover 2 to move linearly and insert them into the connecting groove 901 set in the corresponding extrusion rod 9. The inclined surface of the sliding wedge 17 slides with the inclined surface of the connecting groove 901 of the extrusion rod 9. Through the guidance of the guide cylinder 8, the extrusion column is forced to be inserted into the coupling body 1, and multiple extrusion rods 9 move synchronously to push the lining ring 7 out of the retreat groove 102, so that personnel can recover and remove the lining ring 7.

[0035] like Figures 5 and 6 As shown, in the embodiment of the present invention, the top end of the extrusion rod 9 is provided with a limit arc block 10 abutting against the inner wall of the movable cover 3. When the sliding wedge block 17 is not in transmission connection with the extrusion rod 9, the limit arc block 10 abuts against the inner wall of the movable cover 3 through elastic support to position the extrusion rod 9.

[0036] Furthermore, a group of supporting springs 11 are respectively connected to both ends of the limiting arc block 10, and the two groups of supporting springs 11 are elastically connected to the outer wall of the coupling body 1. When the sliding wedge 17 is inserted into the connecting groove inside the extrusion rod 9, the extrusion rod 9 is driven to insert into the coupling body 1. At this time, the two groups of supporting springs 11 are in a compressed state. On the contrary, when the movable cover 3 rotates and moves, the sliding wedge 17 resets and slides away from the extrusion rod 9. At this time, the extrusion rod 9 is supported by the elastic force of the two groups of supporting springs 11 to reset and slide toward the outside of the coupling body 1.

[0037] In the present invention, the support spring 11 plays a role of elastic reset. Of course, in actual design, other components with elastic reset driving capabilities can also be selected to replace the support spring 11 used in the present invention.

[0038] like Figure 3 and Figure 5As shown, in the embodiment of the present invention, the transmission assembly includes a fixed ring 14, a positioning column 15 and a transmission guide groove 13, wherein the fixed ring 14 is coaxially mounted on the outer wall of the fixed cover 2, which is inside the movable cover 3, the positioning column 15 is fixedly mounted on the inner side of the open end panel of the fixed cover 2, a driving block 12 is slidably mounted on the positioning column 15, the transmission guide groove 13 is fixedly connected to the driving block 12, and a sliding groove 131 slidably connected to the fixed ring 14 is provided therein, and the transmission guide groove 13 is fixedly connected to the sliding wedge 17 through a connecting piece. When the present invention is performing a transmission operation, when the movable cover 3 is rotated and inserted into the fixed cover 2, the fixed ring 14 on the outer side of the fixed cover 2 slides along the sliding groove 131 in the transmission guide groove 13. Since the transmission guide groove 13 is positioned along the driving block 12 by the sliding of the positioning column 15, it moves linearly along the axial direction of the positioning column 15 after being subjected to force, and pushes the sliding wedge 17 to move linearly.

[0039] Wherein, the connecting member is a connecting plate bracket, and the present invention fixedly connects the transmission guide groove 13 and the sliding line block through the connecting bracket 16.

[0040] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, a plurality of support frames 4 are installed at the lower portion of the coupling body 1, and the coupling body 1 is supported by the support frames 4. A handle 6 for a person to hold and rotate is provided on the outer side of the fixed cover 2, and the lower surface of the support frame 4 is lower than the bottom end of the fixed cover 2, thereby preventing the handle 6 on the outer side of the fixed cover 2 from contacting the ground.

[0041] In summary, the present invention sets components such as an inner liner ring 7 and an extrusion structure, and the first thread and the second thread at both ends of the coupling body 1 are respectively connected to the oil pipe 5. After the oil pipe 5 is screwed on, the ends of the two oil pipes 5 respectively squeeze the inner convex surface on the inner liner ring 7 to fix it. The inner liner ring 7 and the inner convex surface increase the sealing effect and prevent the thread from being corroded. The movable cover 3 and the fixed cover 2 isolate the multiple extrusion rods 9 from the outside world, thereby protecting the multiple extrusion rods 9 to prevent the extrusion rods 9 from accidentally rotating under the influence of the outside world, thereby affecting the use. When the inner liner ring 7 needs to be disassembled, the movable cover 3 is rotated. At this time, the extrusion rod 9 is forced to be inserted into the coupling body 1. The rotation drives the extrusion rod 9 to be inserted into the coupling body 1, so that the extrusion rod 9 squeezes the inner liner ring 7, thereby separating the inner liner ring 7 from the backing groove 102, and then the inner liner ring 7 is taken out, thereby achieving the effect of easy disassembly.

[0042] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A new type of lined oil pipe anti-corrosion coupling, characterized in that: include: A coupling body, wherein a cutter groove is arranged inside the coupling body, and inner walls of the coupling body on both sides of the cutter groove are correspondingly provided with a first thread and a second thread, wherein the first thread and the second thread are used for threaded connection with a corresponding oil pipe; The inner liner ring is placed in the knife-back groove and is made of rubber. The inner side of the inner liner ring is provided with an inner convex surface. The inner diameter of the inner convex surface is the same as the inner diameter of the oil pipe. The groove wall of the knife-back groove is provided with multiple sets of guide cylinders. An extrusion rod is slidably installed in the guide cylinder. The outer end of the extrusion rod is elastically connected to the outer wall of the coupling body through an elastic member. A connecting groove is provided in the extrusion rod. A transmission inclined surface is installed in the connecting groove. The extrusion structure comprises a fixed cover and a movable cover, wherein the fixed cover is fixedly mounted on the outside of the coupling body, the movable cover is threadedly connected to one side of the coupling cover, one end of the fixed cover is provided with an opening for the movable cover to be rotatably inserted, a sliding wedge is slidably mounted in the fixed cover, the sliding wedge is used to be slidably connected with the inclined surface in the extrusion rod, the sliding wedge is transmission-connected with the end surface of the movable cover through a transmission assembly, and the sliding wedge is driven to move linearly by the threaded rotation of the movable cover; When the sliding wedge is linearly inserted into the connecting groove provided in the extrusion rod, the extrusion rod is forced to be inserted into the coupling body; The transmission assembly includes a fixing ring, a positioning column and a transmission guide groove; Wherein, the fixed ring is coaxially mounted on the outer wall of the movable cover and is located inside the fixed cover; The positioning column is fixedly mounted on the inner side of the opening end panel of the fixed cover, and a driving block is slidably mounted on the positioning column; The transmission guide groove is fixedly connected to the driving block, and a sliding groove slidably connected to the fixing ring is arranged therein, and the transmission guide groove is fixedly connected to the sliding wedge block through a connecting piece.

2. The novel anti-corrosion coupling for lined oil pipe according to claim 1 is characterized in that: The top end of the extrusion rod is provided with a limiting arc block abutting against the inner wall of the fixing cover.

3. The novel anti-corrosion coupling for lined oil pipe according to claim 2 is characterized in that: A group of supporting springs are respectively connected to the two ends of the limiting arc block, and the two groups of supporting springs are elastically connected to the outer wall of the coupling body.

4. The novel anti-corrosion coupling for lined oil pipe according to claim 3 is characterized in that: The connecting piece is a connecting plate bracket.

5. The novel anti-corrosion coupling for lined oil pipe according to claim 1 is characterized in that: A plurality of support frames are installed at the lower part of the coupling body, and the coupling body is supported by the support frames.

6. The novel anti-corrosion coupling for lined oil pipe according to claim 1 is characterized in that: A handle for a person to hold and rotate is arranged on the outer side of the movable cover.

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