Coupling special for lining oil pipe

Abstract

The utility model discloses a special coupling for a lining oil pipe, which relates to the technical field of oil pipe couplings and comprises a coupling body and two first anti-corrosion blocks, the two ends of the coupling body are symmetrically arranged, the two first anti-corrosion blocks are symmetrically arranged at the two ends of the coupling body, an annular connecting block is fixedly arranged in the coupling body, and a second anti-corrosion block is sleeved on the inner side of the annular connecting block. According to the anti-corrosion coupling, the first anti-corrosion block and the second anti-corrosion block are arranged at the contact position of an oil pipe and the oil pipe, corrosion of threads between the coupling body and the oil pipe can be effectively prevented, meanwhile, the sleeves are arranged on the outer side of the coupling body in a sleeved mode, and therefore the anti-corrosion coupling is convenient to use. The outside of the contact position of the coupling body and the oil pipe is protected, external sewage is prevented from permeating into the contact position of the coupling body and the oil pipe, and the service life of the coupling body is prolonged.

Description

Technical Field

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

[0002] The pipe body of coupling type oil casing is connected by coupling. Currently, the pipe body and coupling are generally connected by a threaded connection structure.

[0003] To improve the corrosion resistance and service life of oil casing, the threads of the pipe body and couplings need to be coated with anti-corrosion coatings. However, during the threaded connection process, the anti-corrosion coating on the threads often breaks down, seriously affecting the connection strength, sealing and other properties of the oil casing. To address this, we have developed a special coupling for lined oil pipes. Utility Model Content

[0004] The purpose of the utility model is to provide a special coupling for lined oil pipes to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a special coupling for lined oil pipes, comprising a coupling body and a first anti-corrosion block, the two ends of the coupling body are symmetrically arranged, two first anti-corrosion blocks are provided, symmetrically arranged at both ends of the coupling body, an annular coupling block is fixedly provided in the coupling body, a second anti-corrosion block is sleeved on the inner side of the annular coupling block, a sleeve is symmetrically provided on the outer side of the coupling body, and the first anti-corrosion block is embedded on the inner side of the sleeve. The present invention can effectively prevent the corrosion of the threads between the coupling body and the oil pipe by arranging the first anti-corrosion block and the second anti-corrosion block at the contact point between the oil pipe and the coupling body, and at the same time, a sleeve is sleeved on the outer side of the coupling body to protect the outside of the contact point between the coupling body and the oil pipe, thereby preventing external sewage from seeping into the contact point between the coupling body and the oil pipe and improving the service life of the coupling body.

[0006] Preferably, the cross-section of the first anti-corrosion block is I-shaped, one side of the first anti-corrosion block is sealed and engaged with the first embedding groove set at the end of the coupling body, and the other side of the first anti-corrosion block is sealed and engaged with the second embedding groove set on the outside of the external oil pipe, thereby improving the connection strength between the first anti-corrosion block and the coupling body and the oil pipe.

[0007] Preferably, the second anti-corrosion block is U-shaped, the inner groove of the second anti-corrosion block is embedded in the inner side of the annular connecting block, a plurality of first triangular blocks are fixedly provided on the inner side of the second anti-corrosion block, and the plurality of first triangular blocks are respectively provided at the bottom and both sides of the inner groove of the second anti-corrosion block, a first triangular groove embedded in the first triangular block is provided on the inner side of the annular connecting block, second triangular blocks are fixed on both sides of the outside of the second anti-corrosion block, a second triangular groove embedded in the second triangular block is provided at the end of the oil pipe, and the second anti-corrosion block is clamped on the annular connecting block by two oil pipes to prevent the oil in the pipe from seeping into the connection between the oil pipe and the coupling body.

[0008] Preferably, third triangular blocks are fixedly provided on both sides of the annular connecting block and are symmetrically distributed. The end of the oil pipe is provided with a third triangular groove engaged with the third triangular block, thereby improving the sealing performance of the connection.

[0009] Preferably, the inner side of the coupling body is provided with a first internal thread, a second internal thread and a third internal thread that cooperate with the outer side of the oil pipe. The connection between the first internal thread and the second internal thread and the connection between the second internal thread and the third internal thread are both provided with a conical sealing surface and a stepped surface. The inner diameters of the first internal thread, the second internal thread and the third internal thread gradually increase. By setting the stepped thread and the conical sealing surface, the connection sealing performance between the coupling body and the oil pipe can be improved.

[0010] Preferably, a third anti-corrosion block is provided in the stepped surface, one side of the third anti-corrosion block is sealingly engaged with a third embedding groove provided on the outside of the stepped surface, and the other side of the third anti-corrosion block is sealingly engaged with a fourth embedding groove provided on the outside of the external oil pipe. An anti-corrosion block is provided in front of each layer of thread, which can provide multi-layer protection for the threads at the connection between the coupling body and the oil pipe, preventing all threads from being corroded by contact with the corrosive liquid when the second anti-corrosion block or the first anti-corrosion block rots.

[0011] Preferably, an annular groove is provided on the outside of the coupling body, a connecting ring is fixedly provided in the middle of the annular groove, and two symmetrically distributed fourth anti-corrosion blocks are provided on the outside of the connecting ring. One side of the fourth anti-corrosion block is sealed with a fifth embedded groove provided on the outside of the connecting ring, and the other side of the fourth anti-corrosion block is sealed with a sixth embedded groove provided at one end of the sleeve. An auxiliary groove is provided on the end of the sleeve away from the fourth anti-corrosion block, and the inner side of the sleeve is fixed to the outside of the coupling body by a thread. The auxiliary groove and the second embedded groove provided on the outside of the external oil pipe cooperate together and are sealed with the side of the first anti-corrosion block away from the end of the coupling body. The annular groove is sealed by the sleeve, and the air inside can improve the thermal insulation performance of the coupling body and reduce the heat loss of the oil passing through the coupling body.

[0012] Preferably, a conical buffer surface is provided on the outer side of one end of the sleeve away from the fourth anti-corrosion block, so that the connection transition between the sleeve and the outer side of the oil pipe is smoother.

[0013] Compared with traditional technology, the beneficial effects of this utility model are:

[0014] 1. The utility model can effectively prevent the corrosion of the threads between the coupling body and the oil pipe by arranging the first anti-corrosion block and the second anti-corrosion block at the contact point between the oil pipe and the coupling body. At the same time, a sleeve is sleeved on the outside of the coupling body to protect the outside of the contact point between the coupling body and the oil pipe, avoiding external sewage from penetrating into the contact point between the coupling body and the oil pipe, thereby improving the service life of the coupling body.

[0015] 2. By setting multi-level threads and conical sealing surfaces at the connection between the coupling body and the oil pipe, the connection sealing performance between the coupling body and the oil pipe can be improved. At the same time, a third anti-corrosion block is set between the threads at each level. When the first anti-corrosion block or the second anti-corrosion block leaks, the corrosive liquid will not penetrate into all threads at the same time, thereby achieving multi-level protection for the threads and improving the anti-corrosion performance of the coupling body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the coupling body of the utility model;

[0019] Figure 4 This is a structural diagram of the annular connecting block and the second anti-corrosion block of the utility model.

[0020] In the figure: 1-coupling body; 2-first anti-corrosion block; 3-annular connecting block; 4-second anti-corrosion block; 5-sleeve; 6-first triangular block; 7-second triangular block; 8-third triangular block; 9-first internal thread; 10-second internal thread; 11-third internal thread; 12-conical sealing surface; 13-step surface; 14-third anti-corrosion block; 15-annular groove; 16-connecting ring; 17-fourth anti-corrosion block; 18-auxiliary groove; 19-conical buffer surface. DETAILED DESCRIPTION

[0021] The present invention is described in further detail below with reference to the accompanying drawings.

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate directions or positions are based on the directions or positional relationships shown in the accompanying drawings, which are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0024] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0025] Example:

[0026] See also Figures 1-4 , a special coupling for lined oil pipes, including a coupling body 1 and a first anti-corrosion block 2. The two ends of the coupling body 1 are symmetrically arranged. There are two first anti-corrosion blocks 2, which are symmetrically arranged at the two ends of the coupling body 1. An annular coupling block 3 is fixedly provided in the coupling body 1, and a second anti-corrosion block 4 is sleeved on the inner side of the annular coupling block 3. A sleeve 5 is symmetrically provided on the outside of the coupling body 1, and the first anti-corrosion block 2 is embedded on the inner side of the sleeve 5. The utility model can effectively prevent the corrosion of the threads between the coupling body 1 and the oil pipe by arranging the first anti-corrosion block 2 and the second anti-corrosion block 4 at the contact point between the oil pipe and the contact pipe. At the same time, a sleeve 5 is sleeved on the outside of the coupling body 1 to protect the outside of the contact point between the coupling body 1 and the oil pipe, thereby preventing external sewage from seeping into the contact point between the coupling body 1 and the oil pipe, thereby improving the service life of the coupling body 1.

[0027] Among them, the cross-section of the first anti-corrosion block 2 is an I-shape, one side of the first anti-corrosion block 2 is sealed and engaged with the first embedding groove set at the end of the coupling body 1, and the other side of the first anti-corrosion block 2 is sealed and engaged with the second embedding groove set on the outside of the external oil pipe, thereby improving the connection strength between the first anti-corrosion block 2 and the coupling body 1 and the oil pipe.

[0028] At the same time, the second anti-corrosion block 4 is U-shaped, and the inner groove of the second anti-corrosion block 4 is embedded in the inner side of the annular connecting block 3. A plurality of first triangular blocks 6 are fixed on the inner side of the second anti-corrosion block 4. The plurality of first triangular blocks 6 are respectively arranged at the bottom and both sides of the inner groove of the second anti-corrosion block 4. The inner side of the annular connecting block 3 is provided with a first triangular groove embedded with the first triangular block 6. Second triangular blocks 7 are fixed on both sides of the outside of the second anti-corrosion block 4. A second triangular groove embedded with the second triangular block 7 is provided at the end of the oil pipe. The second anti-corrosion block 4 is clamped on the annular connecting block 3 by two oil pipes to prevent the oil in the pipe from seeping into the connection between the oil pipe and the coupling body 1.

[0029] In addition, the inner side of the coupling body 1 is provided with a first internal thread 9, a second internal thread 10 and a third internal thread 11 that cooperate with the outer side of the oil pipe. The connection between the first internal thread 9 and the second internal thread 10 and the connection between the second internal thread 10 and the third internal thread 11 are both provided with a conical sealing surface 12 and a stepped surface 13. The inner diameters of the first internal thread 9, the second internal thread 10 and the third internal thread 11 gradually increase. By setting the stepped thread and the conical sealing surface 12, the connection sealing performance between the coupling body 1 and the oil pipe can be improved.

[0030] Furthermore, a third anti-corrosion block 14 is provided in the stepped surface 13, and one side of the third anti-corrosion block 14 is sealed with a third embedded groove provided on the outside of the stepped surface 13, and the other side of the third anti-corrosion block 14 is sealed with a fourth embedded groove provided on the outside of the external oil pipe. An anti-corrosion block is provided in front of each layer of thread, which can provide multi-layer protection for the threads at the connection between the coupling body 1 and the oil pipe, thereby preventing all threads from coming into contact with the corrosive liquid and being corroded when the second anti-corrosion block 4 or the first anti-corrosion block 2 rots.

[0031] During the implementation process, by arranging the first anti-corrosion block 2 and the second anti-corrosion block 4 at the contact point between the oil pipe and the coupling body 1, the corrosion of the threads between the coupling body 1 and the oil pipe can be effectively prevented. At the same time, a sleeve 5 is sleeved on the outside of the coupling body 1 to protect the outside of the contact point between the coupling body 1 and the oil pipe, thereby preventing external sewage from seeping into the contact point between the coupling body 1 and the oil pipe and improving the service life of the coupling body 1. The inner diameter of the second anti-corrosion block 4 is the same as the inner diameter of the oil pipe, which can reduce the resistance encountered by the oil when flowing through the second anti-corrosion block 4.

[0032] By arranging a multi-stage threaded first internal thread 9, a second internal thread 10 and a third internal thread 11 and a conical sealing surface 12 at the connection between the coupling body 1 and the oil pipe, the connection sealing performance of the coupling body 1 and the oil pipe can be improved. At the same time, a third anti-corrosion block 14 is arranged between the threads at each level. When the first anti-corrosion block 2 or the second anti-corrosion block 4 leaks, the corrosive liquid will not penetrate into all threads at the same time, thereby realizing multi-stage protection of the threads and improving the anti-corrosion performance of the coupling body 1.

[0033] At the same time, an annular groove 15 is provided on the outside of the coupling body 1, a connecting ring 16 is fixedly provided in the middle of the annular groove 15, and two symmetrically distributed fourth anti-corrosion blocks 17 are provided on the outside of the connecting ring 16. One side of the fourth anti-corrosion block 17 is sealed and embedded in the fifth embedded groove provided on the outside of the connecting ring 16, and the other side of the fourth anti-corrosion block 17 is sealed and embedded in the sixth embedded groove provided at one end of the sleeve 5. An auxiliary groove 18 is provided on the end of the sleeve 5 away from the fourth anti-corrosion block 17, and the inner side of the sleeve 5 is fixed to the outer side of the coupling body 1 by a thread, as shown in FIG. Figure 2 As shown, the auxiliary groove 18 and the second embedded groove provided on the outside of the external oil pipe are matched together and sealed with the side of the first anti-corrosion block 2 away from the end of the coupling body 1. The annular groove 15 is sealed by the sleeve 5. The air inside can improve the thermal insulation performance of the coupling body 1 and reduce the heat loss of the oil passing through the coupling body 1. The sleeve 5 is used to isolate the first anti-corrosion block 2 from the external environment, which can prevent external sewage from reaching the first anti-corrosion block 2, and can further improve the anti-corrosion performance and sealing performance of the connection between the coupling body 1 and the outside of the oil pipe.

[0034] like Figure 1 As shown, the connection between the sleeve 5 and the outer side of the oil pipe is transitioned through a conical buffer surface 19, making the transition smoother.

[0035] like Figure 4 As shown, by using the third triangular block 8 and the third triangular groove in combination, when the end of the oil pipe is rigidly pressed against the outside of the annular connecting block 3, the sealing performance of the connection is improved to prevent oil from entering.

[0036] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. Special coupling for lined oil pipe, characterized by: include: A coupling body (1) and a first anti-corrosion block (2), wherein the two ends of the coupling body (1) are symmetrically arranged, two first anti-corrosion blocks (2) are provided, and are symmetrically arranged at the two ends of the coupling body (1), an annular coupling block (3) is fixedly provided inside the coupling body (1), and a second anti-corrosion block (4) is sleeved on the inner side of the annular coupling block (3), and a sleeve (5) is symmetrically provided on the outer side of the coupling body (1), and the first anti-corrosion block (2) is embedded in the inner side of the sleeve (5).

2. The special coupling for lined oil pipe according to claim 1, characterized in that: The cross section of the first anti-corrosion block (2) is an I-shaped block, one side of the first anti-corrosion block (2) is sealed and engaged with a first embedding groove provided at the end of the coupling body (1), and the other side of the first anti-corrosion block (2) is sealed and engaged with a second embedding groove provided on the outside of the external oil pipe.

3. The special coupling for lined oil pipe according to claim 2, characterized in that: The second anti-corrosion block (4) is U-shaped, the inner groove of the second anti-corrosion block (4) is engaged with the inner side of the annular connecting block (3), a plurality of first triangular blocks (6) are fixedly provided on the inner side of the second anti-corrosion block (4), and the plurality of first triangular blocks (6) are respectively arranged at the bottom and both sides of the inner groove of the second anti-corrosion block (4), the inner side of the annular connecting block (3) is provided with a first triangular groove engaged with the first triangular block (6), second triangular blocks (7) are fixedly provided on both sides of the outside of the second anti-corrosion block (4), and a second triangular groove engaged with the second triangular block (7) is provided at the end of the oil pipe.

4. The special coupling for lined oil pipe according to claim 3, characterized in that: Symmetrically distributed third triangular blocks (8) are fixedly provided on both sides of the annular connecting block (3), and a third triangular groove engaged with the third triangular block (8) is provided at the end of the oil pipe.

5. The special coupling for lined oil pipe according to claim 3, characterized in that: The inner side of the coupling body (1) is provided with a first internal thread (9), a second internal thread (10) and a third internal thread (11) that cooperate with the outer side of the oil pipe. The connection between the first internal thread (9) and the second internal thread (10) and the connection between the second internal thread (10) and the third internal thread (11) are both provided with a conical sealing surface (12) and a stepped surface (13). The inner diameters of the first internal thread (9), the second internal thread (10) and the third internal thread (11) gradually increase.

6. The special coupling for lined oil pipe according to claim 5, characterized in that: A third anti-corrosion block (14) is provided in the stepped surface (13), one side of the third anti-corrosion block (14) is sealed and engaged with a third embedding groove provided on the outside of the stepped surface (13), and the other side of the third anti-corrosion block (14) is sealed and engaged with a fourth embedding groove provided on the outside of the external oil pipe.

7. The special coupling for lined oil pipe according to claim 3, characterized in that: An annular groove (15) is provided on the outside of the coupling body (1), a connecting ring (16) is fixedly provided in the middle of the annular groove (15), and two symmetrically distributed fourth anti-corrosion blocks (17) are provided on the outside of the connecting ring (16), one side of the fourth anti-corrosion block (17) is sealed and engaged with the fifth embedded groove provided on the outside of the connecting ring (16), and the other side of the fourth anti-corrosion block (17) is sealed and engaged with the sixth embedded groove provided at one end of the sleeve (5), and an auxiliary groove (18) is provided at the end of the sleeve (5) away from the fourth anti-corrosion block (17), and the inner side of the sleeve (5) is fixed to the outside of the coupling body (1) by a thread, and the auxiliary groove (18) and the second embedded groove provided on the outside of the external oil pipe are matched together and sealed and engaged with the side of the first anti-corrosion block (2) away from the end of the coupling body (1).

8. The special coupling for lined oil pipe according to claim 7, characterized in that: A conical buffer surface (19) is provided on the outer side of one end of the sleeve (5) away from the fourth anti-corrosion block (17).

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