Sealing joint for optical cable splicing

Abstract

The utility model discloses a sealing joint for optical cable splicing, particularly relates to the technical field of petroleum logging, and comprises an optical cable protection tube, a first sealing locking piece, a second sealing locking piece and a third sealing locking piece, and two ends of the optical cable protection tube are connected with the first sealing locking piece and the second sealing locking piece in sequence. One end of the second sealing locking piece, one end of the first sealing locking piece and one end of the optical cable protection tube are respectively sleeved outside the outer-layer rigid tube of one optical cable, so that the splicing part of the two optical cables is arranged in the optical cable protection tube; the first sealing locking piece is used for fixedly connecting the optical cable protection tube with an outer-layer rigid tube of the optical cable in a sealing manner; the second sealing locking piece is used for enabling the first sealing locking piece to be fixedly connected with an outer-layer rigid pipe of the optical cable in a sealing manner; and the third sealing locking piece is sleeved outside the first sealing locking piece and is used for enabling the optical cable protection tube to be fixedly connected with the first sealing locking piece in a sealing manner. The utility model has the advantages of simple structure and convenient operation, and can enhance the sealing performance after optical cable splicing.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum well logging, in particular to a sealing joint for connecting optical cables. Background Art

[0002] The oil and gas development process requires detailed information on the characteristics and state of the fluids within the well during production and water injection. Its reliability and accuracy are crucial. Therefore, oil exploration well logging is an essential component of the process. It primarily involves using various fiber optic logging instruments to survey the downhole geological conditions during and after drilling. This operation often requires extending the cable and splicing two sections of fiber optic cable. However, the sealing technology used in China for splicing fiber optic cables is not yet mature. Utility Model Content

[0003] The purpose of the utility model is to provide a sealing joint for connecting optical cables to solve the problems existing in the above-mentioned prior art. It has a simple structure, is easy to operate, and can enhance the sealing performance of the optical cables after connection.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The utility model provides a sealing joint for connecting optical cables, comprising an optical cable protection tube, a first sealing locking piece, a second sealing locking piece and a third sealing locking piece, both ends of the optical cable protection tube are connected to the first sealing locking piece and the second sealing locking piece in sequence, one second sealing locking piece, one first sealing locking piece and one end of the optical cable protection tube are used to be sleeved outside the outer steel tube of an optical cable, another second sealing locking piece, another first sealing locking piece and the other end of the optical cable protection tube are used to be sleeved outside the outer steel tube of another optical cable, so that the connecting part of the two optical cables is placed in the optical cable protection tube; the first sealing locking piece is used to seal and fix the optical cable protection tube to the outer steel tube of the optical cable; the second sealing locking piece is used to seal and fix the first sealing locking piece to the outer steel tube of the optical cable; the third sealing locking piece is sleeved outside the first sealing locking piece, used to seal and fix the optical cable protection tube to the first sealing locking piece.

[0006] Preferably, the first sealing locking component includes a first ferrule and a first sealing joint, and the first sealing joint and the first ferrule are sequentially sleeved on the outer steel tube of the optical cable, and the outer side wall of the first sealing joint close to one end of the first ferrule is threadedly connected to the inner side wall of the optical cable protection tube, and the first sealing joint can move toward the direction close to the optical cable protection tube, thereby squeezing the first ferrule, so that the optical cable protection tube is sealed and fixedly connected to the outer steel tube of the optical cable.

[0007] Preferably, the end of the first ferrule away from the first sealing joint has a first outer conical surface, and the optical cable protection tube has a first inner conical surface matching the first outer conical surface.

[0008] Preferably, the second sealing locking member includes a second ferrule and a second sealing joint, the second sealing joint and the second ferrule are sequentially sleeved on the outer steel tube of the optical cable, the outer side wall of the second sealing joint close to one end of the second ferrule is threadedly connected to the inner side wall of the first sealing joint away from the first ferrule, and the second sealing joint can move toward the direction close to the first sealing joint, thereby squeezing the second ferrule, so that the first sealing joint is sealed and fixedly connected to the outer steel tube of the optical cable.

[0009] Preferably, the end of the second ferrule away from the second sealing joint has a second outer conical surface, and the first sealing joint has a third inner conical surface matching the second outer conical surface.

[0010] Preferably, a first groove is provided on the outer side wall of the second sealing joint which is in contact with the inner side wall of the first sealing joint, and a sealing ring for sealing the second sealing joint and the first sealing joint is provided in the first groove.

[0011] Preferably, a second groove is provided on the inner side wall where the second sealing joint contacts the outer steel tube of the optical cable, and a sealing ring for sealing the second sealing joint and the outer steel tube of the optical cable is provided in the second groove.

[0012] Preferably, the third sealing locking member includes a third ferrule and a locking nut, and the locking nut and the third ferrule are sequentially sleeved on the outside of the first sealing joint, and the outer wall of the middle part of the first sealing joint is threadedly connected to the inner wall of the locking nut, and the locking nut can move toward the direction close to the optical cable protection tube, thereby squeezing the third ferrule, so that the optical cable protection tube is sealed and fixedly connected to the first sealing locking member.

[0013] Preferably, an annular groove cooperating with the third ferrule is formed at one end of the locking nut close to the third ferrule, and one end of the third ferrule is inserted into the annular groove.

[0014] The end of the third ferrule away from the locking nut has a third outer conical surface, and the end of the optical cable protection tube has a second inner conical surface matching the third outer conical surface.

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

[0016] The utility model provides a sealing joint for connecting optical cables. The exposed optical fibers at the connecting parts of the two optical cables can be placed in an optical fiber protection tube. The optical fiber protection tube can protect the exposed optical fibers after the connection from being damaged. The first sealing locking piece, the second sealing locking piece and the third sealing locking piece connected at both ends of the optical fiber protection tube can perform three-level sealing on the optical cable, and can prevent moisture, dust and the like from entering the connecting part of the optical cable, causing damage to the optical cable, affecting the transmission of optical signals, and even damaging the optical fibers. Thus, it is ensured that the optical cable maintains good signal transmission performance and ensures the reliability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural diagram of a sealed joint used for optical cable splicing;

[0019] Figure 2 A cross-sectional view of a sealing joint for optical cable splicing;

[0020] Figure 3 for Figure 2 Enlarged view of part A.

[0021] In the figure: 1-optical cable protection tube; 11-first inner cone; 12-second inner cone; 2-first sealing and locking piece; 21-first ferrule; 22-first sealing joint; 23-third inner cone; 3-second sealing and locking piece; 31-second ferrule; 32-second sealing joint; 33-first groove; 34-second groove; 4-third sealing and locking piece; 41-third ferrule; 42-locking nut; 5-outer steel tube of optical cable. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The purpose of the utility model is to provide a sealing joint for connecting optical cables to solve the problems existing in the above-mentioned prior art. It has a simple structure, is easy to operate, and can enhance the sealing performance of the optical cables after connection.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The utility model provides a sealing joint for connecting optical cables. Figure 1-3 As shown, it includes an optical cable protection tube 1, a first sealing locking piece 2, a second sealing locking piece 3 and a third sealing locking piece 4. Both ends of the optical cable protection tube 1 are connected to the first sealing locking piece 2 and the second sealing locking piece 3 in sequence. A second sealing locking piece 3, a first sealing locking piece 2 and one end of the optical cable protection tube 1 are used to be sleeved outside the outer steel tube 5 of an optical cable, and another second sealing locking piece 3, another first sealing locking piece 2 and the other end of the optical cable protection tube 1 are used to be sleeved outside the outer steel tube 5 of another optical cable, so that the connection part of the two optical cables is placed in the optical cable protection tube 1; the first sealing locking piece 2 is used to seal and fix the optical cable protection tube 1 with the outer steel tube 5 of the optical cable; the second sealing locking piece 3 is used to seal and fix the first sealing locking piece 2 with the outer steel tube 5 of the optical cable; the third sealing locking piece 4 is sleeved outside the first sealing locking piece 2, for sealing and fixing the optical cable protection tube 1 with the first sealing locking piece 2. Before splicing the optical fibers, insert the second sealing locking piece 3, the first sealing locking piece 2 and the third sealing locking piece 4 into one optical cable in turn, and insert the second sealing locking piece 3, the first sealing locking piece 2, the third sealing locking piece 4 and the optical cable protection tube 1 into another optical cable in turn. After the optical fibers of the two optical cables are welded, move the optical cable protection tube 1 to place the exposed optical fibers in the optical fiber protection tube. The optical fiber protection tube can protect the exposed optical fibers after splicing from damage; the optical cable protection tube 1 is sealed and fixed to the outer steel tube 5 of the optical cable by the first sealing locking piece 2 to achieve the first seal; the first sealing locking piece 2 is sealed and fixed to the outer steel tube 5 of the optical cable by the second sealing locking piece 3 to achieve the second seal; the optical cable protection tube 1 is sealed and connected to the first sealing locking piece 2 by the third sealing locking piece 4 to achieve the third seal; by performing three-level sealing on the optical cable, moisture, dust, etc. can be prevented from entering the optical cable splicing position, causing damage to the optical cable, affecting the transmission of optical signals, and even damaging the optical fiber; thereby ensuring that the optical cable maintains good signal transmission performance and ensures the reliability of the connection.

[0026] It is further preferred in the implementation manner of this embodiment that the first sealing locking component 2 includes a first ferrule 21 and a first sealing joint 22, and the first sealing joint 22 and the first ferrule 21 are sequentially sleeved on the outer layer of the optical cable rigid tube 5, and the outer side wall of the first sealing joint 22 close to the first ferrule 21 is threadedly connected to the inner side wall of the optical cable protection tube 1, that is, the end of the first sealing joint 22 close to the first ferrule 21 has a first external thread, and the inner side walls at both ends of the optical cable protection tube 1 have an internal thread of the protection tube that matches the first external thread, and the first sealing joint 22 can move toward the direction close to the optical cable protection tube 1, thereby squeezing the first ferrule 21, so that the optical cable protection tube 1 is sealed and fixedly connected to the outer layer of the rigid tube 5 of the optical cable, thereby realizing the first seal.

[0027] In this embodiment, the first ferrule 21 preferably has a first outer conical surface at the end distal from the first sealing joint 22, and the cable protection tube 1 has a first inner conical surface 11 matching the first outer conical surface. The first inner conical surface 11 is located within the internal threads of the cable protection tube 1. As internal pressure increases, the conical sealing surface becomes tighter, maintaining a good seal. Furthermore, the conical seal provides a more balanced pressure distribution across the contact surface, reducing seal failures caused by uneven local pressure and extending the service life of the seal.

[0028] It is further preferred in the implementation manner of this embodiment that the second sealing locking member 3 includes a second ferrule 31 and a second sealing joint 32, and the second sealing joint 32 and the second ferrule 31 are sequentially sleeved on the outer layer of the outer steel tube 5 of the optical cable, and the outer side wall of the second sealing joint 32 close to one end of the second ferrule 31 is threadedly connected to the inner side wall of the first sealing joint 22 away from the first ferrule 21, and the second sealing joint 32 can move in the direction close to the first sealing joint 22, thereby squeezing the second ferrule 31, so that the first sealing joint 22 is sealed and fixedly connected to the outer layer of the outer steel tube 5 of the optical cable, thereby realizing the second seal.

[0029] It is further preferred in the implementation manner of this embodiment that the second ferrule 31 has a second outer conical surface at the end away from the second sealing joint 32, and the first sealing joint 22 has a third inner conical surface 23 matching the second outer conical surface, and the third inner conical surface 23 is located inside the internal thread of the first sealing joint 22.

[0030] In the embodiment of this embodiment, a first groove 33 is formed on the outer side wall of the second sealing joint 32 that contacts the inner side wall of the first sealing joint 22. A sealing ring for sealing the second sealing joint 32 and the first sealing joint 22 is disposed in the first groove 33. A second groove 34 is formed on the inner side wall of the second sealing joint 32 that contacts the outer steel tube 5 of the optical cable. A sealing ring for sealing the second sealing joint 32 and the outer steel tube 5 of the optical cable is disposed in the second groove 34. The two layers of sealing rings can further enhance the sealing performance.

[0031] It is further preferred in the implementation manner of this embodiment that the third sealing locking component 4 includes a third ferrule 41 and a locking nut 42, and the locking nut 42 and the third ferrule 41 are sequentially sleeved on the outside of the first sealing joint 22, and the outer wall of the middle part of the first sealing joint 22 is threadedly connected to the inner wall of the locking nut 42, that is, the outer wall of the middle part of the first sealing joint 22 has a second external thread, and the inner wall of the locking nut 42 has a nut internal thread matching the second external thread, and the locking nut 42 can move toward the direction close to the optical cable protection tube 1, thereby squeezing the third ferrule 41, so that the optical cable protection tube 1 is sealed and fixedly connected to the first sealing locking component 2, thereby realizing the third seal.

[0032] It is further preferred in the implementation of this embodiment that an annular groove cooperating with the third ferrule 41 is formed at one end of the locking nut 42 close to the third ferrule 41 , and one end of the third ferrule 41 is inserted into the annular groove.

[0033] In the embodiment of the present invention, the third ferrule 41 has a third outer conical surface at one end away from the locking nut 42, and the end of the cable protection tube 1 has a second inner conical surface 12 that matches the third outer conical surface. The second inner conical surface 12 is located outside the internal thread of the cable protection tube 1.

[0034] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A sealed joint for optical cable splicing, characterized by: It includes an optical cable protection tube, a first sealing locking piece, a second sealing locking piece and a third sealing locking piece. Both ends of the optical cable protection tube are connected to the first sealing locking piece and the second sealing locking piece in sequence. One second sealing locking piece, one first sealing locking piece and one end of the optical cable protection tube are used to be sleeved outside the outer steel tube of an optical cable, and another second sealing locking piece, another first sealing locking piece and the other end of the optical cable protection tube are used to be sleeved outside the outer steel tube of another optical cable, so that the connection part of the two optical cables is placed in the optical cable protection tube; the first sealing locking piece is used to seal and fix the optical cable protection tube to the outer steel tube of the optical cable; the second sealing locking piece is used to seal and fix the first sealing locking piece to the outer steel tube of the optical cable; the third sealing locking piece is sleeved outside the first sealing locking piece to seal and fix the optical cable protection tube to the first sealing locking piece.

2. The sealed joint for optical cable splicing according to claim 1, characterized in that: The first sealing locking component includes a first ferrule and a first sealing joint, which are sequentially sleeved on the outer steel tube of the optical cable. The outer side wall of the first sealing joint close to one end of the first ferrule is threadedly connected to the inner side wall of the optical cable protection tube. The first sealing joint can move toward the direction close to the optical cable protection tube, thereby squeezing the first ferrule so that the optical cable protection tube is sealed and fixedly connected to the outer steel tube of the optical cable.

3. The sealed joint for optical cable splicing according to claim 2, characterized in that: The end of the first ferrule away from the first sealing joint has a first outer conical surface, and the optical cable protection tube has a first inner conical surface matching the first outer conical surface.

4. The sealed joint for optical cable splicing according to claim 2, characterized in that: The second sealing locking component includes a second ferrule and a second sealing joint. The second sealing joint and the second ferrule are sequentially sleeved on the outer steel tube of the optical cable. The outer side wall of the second sealing joint close to one end of the second ferrule is threadedly connected to the inner side wall of the first sealing joint away from the first ferrule. The second sealing joint can move toward the direction close to the first sealing joint, thereby squeezing the second ferrule so that the first sealing joint is sealed and fixedly connected to the outer steel tube of the optical cable.

5. The sealed joint for optical cable splicing according to claim 4, characterized in that: The second ferrule has a second outer conical surface at one end away from the second sealing joint, and the first sealing joint has a third inner conical surface matching the second outer conical surface.

6. The sealed joint for optical cable splicing according to claim 4, characterized in that: A first groove is provided on the outer side wall of the second sealing joint that is in contact with the inner side wall of the first sealing joint. A sealing ring for sealing the second sealing joint and the first sealing joint is provided in the first groove.

7. The sealed joint for optical cable splicing according to claim 6, characterized in that: A second groove is provided on the inner side wall where the second sealing joint contacts the outer steel tube of the optical cable. A sealing ring for sealing the second sealing joint and the outer steel tube of the optical cable is provided in the second groove.

8. The sealed joint for optical cable splicing according to claim 2, characterized in that: The third sealing locking part includes a third ferrule and a locking nut, and the locking nut and the third ferrule are sequentially sleeved on the outside of the first sealing joint, and the outer wall of the middle part of the first sealing joint is threadedly connected to the inner wall of the locking nut. The locking nut can move toward the direction close to the optical cable protection tube, thereby squeezing the third ferrule, so that the optical cable protection tube is sealed and fixedly connected to the first sealing locking part.

9. The sealed joint for optical cable splicing according to claim 8, characterized in that: An annular groove cooperating with the third ferrule is formed on one end of the locking nut close to the third ferrule, and one end of the third ferrule is inserted into the annular groove.

10. The sealed joint for optical cable splicing according to claim 9, characterized in that: The end of the third ferrule away from the locking nut has a third outer conical surface, and the end of the optical cable protection tube has a second inner conical surface matching the third outer conical surface.

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