Steel pipe cable connector

Abstract

The utility model discloses a steel pipe cable connector, and relates to the technical field of cable connection. The steel pipe cable connector comprises two connecting plugs, the two connecting plugs are respectively connected with cable cores of two cut-off cables, and one end, far away from the connecting end of the connecting plugs and the cables, of each connecting plug is provided with a mounting groove; the two plug assemblies are respectively a male plug assembly and a female plug assembly, and the two plug assemblies are respectively used for sealing the two cut-off cables and the connecting plugs connected with the cables; the plug assembly comprises plug bodies, a connector and a pressing cap which are sequentially arranged on a cable in a sleeving mode from the cut-off position of the cable, the plug bodies are arranged on the outer sides of the connecting plug and the cable in a sleeving mode, and the ends, opposite to the connecting plug, of the two plug bodies are sealed and fixed through a connector, a union nut and a pressing nut. The other end of the connector is inserted into the pressing cap, and the other end of the connector is in sealed connection with the pressing cap.

Description

Technical Field

[0001] The utility model relates to the technical field of cable connection, in particular to a steel pipe cable connector. Background Art

[0002] To improve the efficiency and accuracy of injection well monitoring and adjustment, an intelligent injection system has been developed for oil and gas field water injection. This process requires the use of steel pipe cables. The upper computer on the surface uses the steel pipe cables to power and transmit signals to the injection units downhole to control the injection volume. Because each well is multi-layered, the cable must be cut in the middle and then reconnected when passing through the downhole tools. This requires the use of cable connectors, and the cable connection must ensure its sealing, conductivity, and portability. Existing cable connectors use a simpler ferrule connection method, which is relatively simple and prone to poor sealing. Furthermore, they cannot guarantee sealing when the steel pipe cables are damaged. If the seal fails, the entire well construction will fail. Utility Model Content

[0003] To this end, an embodiment of the present invention provides a steel pipe cable connector to solve the problems existing in the above-mentioned technology.

[0004] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0005] A steel pipe cable connector, comprising:

[0006] Two connecting plugs, each connected to the cable cores of the two cut cables, with a mounting groove provided at one end of the connecting plug away from the end connected to the cable; two plug assemblies, each comprising a male plug assembly and a female plug assembly, each used to seal the two cut cables and the connecting plugs connected to the cables;

[0007] The plug assembly includes a plug body, a connector and a pressure cap, which are sequentially sleeved on the cable at the cable cutoff point. The plug body is sleeved on the outside of the connecting plug and the cable. The ends of the two plug bodies opposite to the connecting plugs are sealed and fixed by a connector nut and a pressure nut through a connector. The other end of the plug body is inserted into one end of the connector and the two are sealed. The other end of the connector is inserted into the pressure cap and the two are sealed.

[0008] Optionally, the outer side wall of one end where the two plug bodies are connected is configured as a three-layer stepped structure;

[0009] The lowest step of the stepped structure of the male plug body of the male plug assembly is provided with a first sealing structure, and the middle step is provided with an external thread structure;

[0010] The lowest step of the female plug body replacement structure of the female plug assembly is provided with an external thread for sleeved and threadedly connected to a pressure nut, and the height of the pressure nut is higher than the height of the lowest step, and an insulating sleeve is provided between the pressure nut and the connecting plug. The female connector is sleeved on the outside of the pressure nut and the female plug body, and the position corresponding to the middle step between the female connector and the female plug body protrudes inward to form a step and fits with the middle step of the female plug body. A second sealing structure is also provided on the middle step of the female plug body, and the inner side wall of the end where the female connector is connected to the male plug body is provided with an internal thread that matches it.

[0011] Optionally, both ends of the connector are provided with plug rods that are compatible with the mounting grooves on the connecting plug, and the end of the connector corresponding to the male plug assembly is threadedly connected to the inner wall of the male plug body through a threaded structure, and a third sealing structure is provided between the connector and the inner wall of the male plug body.

[0012] Optionally, a first insulating sleeve is provided between the male plug body and the connecting plug in the male plug assembly, and a second insulating sleeve is provided between the pressing nut and the connecting plug in the female plug assembly.

[0013] Optionally, a fourth sealing structure is provided between the male plug body and the exposed insulating layer of the cut-off cable.

[0014] Optionally, the plug body and the connector are threadedly connected via a threaded structure, and a first locking ring set is provided between the plug body and the connector.

[0015] Optionally, the connector and the pressure cap are threadedly connected via a threaded structure, and a second locking ring set is provided between the connector and the pressure cap.

[0016] The utility model has at least the following beneficial effects:

[0017] This steel pipe cable connector ensures a seal between the outer casing and the cable core diameter even when the steel pipe is damaged. This ensures insulation and sealing after the cable connection. Conventional cable connectors have poor sealing, which can lead to construction failures, increasing workload and costs, and increasing safety risks due to frequent wellhead operations. This steel pipe cable connector avoids this, ensuring leak-free operation even during extended use, maintaining cable connection performance, and significantly improving construction reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other drawings based on the provided drawings without inventive effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented. Any structural modifications, changes in proportions, or adjustments in sizes shall remain within the scope of the technical contents disclosed herein without affecting the efficacy and objectives of the present invention.

[0020] Figure 1 This is a schematic diagram of the internal structure of a male plug assembly according to one embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of a female plug assembly according to one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the steel tube cable structure;

[0023] Figure 4 This is a schematic structural diagram of a lock ring assembly according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection structure of a male plug assembly and a female plug assembly according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Connecting plug; 2. Cable core; 3. Male plug assembly; 31. Male plug body; 4. Female plug assembly; 41. Female plug body; 5. Connector; 6. Pressing cap; 7. Pressing nut; 8. Union nut; 9. Connector; 10. First sealing structure; 11. First insulating sleeve; 12. Second insulating sleeve; 13. Second sealing structure; 14. Third sealing structure; 15. Fourth sealing structure; 16. Locking ring; 17. Sealing ring; 18. Stainless steel layer; 19. Isolation layer; 20. Insulation layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not necessarily need to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0029] In addition, the terms "including", "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization solutions conceived by the present invention.

[0030] like Figure 1-Figure 5 As shown, a steel pipe cable connector disclosed in the present utility model includes:

[0031] Two connecting plugs 1, each connected to a cable core 2 of two cut cables, with a mounting groove provided at one end of the connecting plug 1 away from the end where the connecting plug 1 is connected to the cable; two plug assemblies, a male plug assembly 3 and a female plug assembly 4, respectively, for sealing the two cut cables and the connecting plugs 1 connected to the cables;

[0032] The plug assembly includes a plug body, a connector 5 and a pressure cap 6, which are sequentially sleeved on the cable at the cable cutoff point. The plug body is sleeved on the outside of the connecting plug 1 and the cable. The ends of the two plug bodies opposite to the connecting plug 1 are sealed and fixed by a connector 9, a nut 8 and a pressure cap 7. The other end of the plug body is inserted into one end of the connector 5 and the two are sealed. The other end of the connector 5 is inserted into the pressure cap 6 and the two are sealed.

[0033] The above-mentioned cable is a steel tube cable, which is divided into 4 layers. The first layer is a stainless steel layer 18 (the outermost layer), the second layer is an isolation layer 19, the third layer is an insulating layer 20, and the fourth layer is a cable core 2. The insulation between the outer shell and the cable core 2 must be ensured during use.

[0034] When two cut cables are connected, the cable core 2 and the insulation layer 20 of the steel tube cable extend out of the isolation layer 19 for a certain length to connect to the connecting plug 1. The connecting plug 1 is made of a conductive material, generally a conductive metal. A notch is provided at one end of the connecting plug 1 connected to the cable core 2. The cable core 2 and the connecting plug 1 can be crimped or welded together.

[0035] The plug body is a cylindrical structure, which is placed on the outside of the steel pipe cable, and the end of the insulating layer 20 and the cable core 2 extending out is placed inside the plug body;

[0036] The connector 5 and the pressure cap 6 are also cylindrical structures. The connector 5 is sleeved on the outside of the stainless steel layer 18 of the steel pipe cable and is sealed and fixed to the plug body. A through hole is opened in the middle of the connector 5 for exhaust. The pressure cap 6 is arranged on one side of the connector 5 and is sealed and fixed to the connector 5. A hexagon is provided on the outside of the pressure cap 6 to fix and support the pressure cap 6.

[0037] Furthermore, the outer side wall of one end where the two plug bodies are connected is configured as a three-layer stepped structure;

[0038] The lowest step of the stepped structure of the male plug body 31 of the male plug assembly 3 is provided with a first sealing structure 10, and the middle step is provided with an external thread structure;

[0039] The lowest step of the replacement structure of the female plug body 41 of the female plug assembly 4 is provided with an external thread, which is used to sleeve and threadably connect the pressure nut 7, and the height of the pressure nut 7 is higher than the height of the lowest step. The free nut 8 is sleeved on the outside of the pressure nut 7 and the female plug body 41, and the position corresponding to the middle step of the free nut 8 and the female plug body 41 protrudes inward to form a step and fits with the middle step of the female plug body 41. A second sealing structure 13 is also provided on the middle step of the female plug body 41, and the inner side wall of the end where the free nut 8 is connected to the male plug body 31 is provided with an internal thread adapted thereto.

[0040] The two plug bodies are respectively a male plug body 31 and a female plug body 41, and the two plug bodies have the same structure;

[0041] The front end of the male plug body 31 (the end connected to the female plug body 41) is provided with a three-layer stepped structure that contracts inward, that is, the diameter of the front end of the male plug body 31 has three sizes, and the outer circumference of the middle size is provided with an external thread. The front end is the smallest size, and the circumference of the smallest size is sleeved with a first sealing structure 10. The first sealing structure 10 is three annular grooves provided on the outer circumference of the male plug body 31. O-rings and sealing ring retaining rings are provided in the three annular grooves; the rear end of the male plug body 31 (the end connected to the connector 5) is provided with an inwardly contracting stepped structure, which can be inserted into the interior of the connector 5. Matching internal and external threads are provided on the inner side wall of the connector 5 and the outer side wall of the male plug body 31 for connecting and sealing the connector 5 and the male plug body 31. The end of the connector 5 away from the male plug body 31 is also provided with an inwardly contracting stepped structure for insertion into the interior of the pressure cap 6. Internal and external threads are provided on the interior of the pressure cap 6 and the end of the connector 5 for connecting and sealing the connector 5 and the pressure cap 6.

[0042] Similarly, in the female plug assembly 4 , the connections between the female plug body 41 and the connector 5 , and between the connector 5 and the pressure cap 6 adopt the same connection structure as that in the male plug assembly 3 , which will not be described in detail here.

[0043] In the female plug assembly 4, the female plug body 41 is a cylindrical structure, and the front end of the female plug body 41 (the end connected to the male plug) is also provided with a three-layer stepped structure that contracts inward, and its diameter gradually becomes smaller. The length of its second step is greater than the length of the threaded structure on the second step on the male plug body 31. An external thread is provided on the outer circumferential side of the first step for sleeve-mounting the cylindrical pressing nut 7. The inner side wall of the end of the pressing nut 7 is provided with an internal thread adapted thereto, so that the pressing nut 7 can be threadedly connected to the female plug body 41. At the same time, the diameter of the pressing nut 7 is slightly larger than the diameter of the second step structure at the female plug body 41, so that a groove is formed between the pressing nut 7 and the third step structure of the female plug body 41, and the female nut 8 is sleeved on the outside of the pressing nut 7, and protrudes inward at the position corresponding to the second step structure of the female plug body 41. The second step structure of the head body 41 fits together to form a slider that slides in the groove, so that the female 8 can slide on the second step structure, and at the same time, the two sides are limited by the third step structure and the pressure nut 7. The inner side wall of the other end of the female 8 is provided with an internal thread, which is adapted to the external thread of the second step structure on the male plug body 31, and the two can be threadedly connected and fixed. In the process of threaded connection between the female 8 and the male plug body 31, the female 8 will slide on the pressure nut 7 until the connector 9 is completely connected to the two connecting plugs 1 (at this time, the female 8 no longer slides left and right). At this time, a second sealing structure 13 is provided at the position corresponding to the second step of the female 8 and the female plug body 41. The second sealing structure 13 is three annular grooves provided at the second step structure of the female plug body 41, and O-rings and sealing ring retaining rings are provided in the three annular grooves.

[0044] A second insulating sleeve 12 is provided between the pressure nut 7 and the connecting plug 1 for insulation protection.

[0045] The function of the pressing nut 7 is to press the second insulating sleeve 12 and block the nut 8; the nut 8 can rotate freely in the circumferential direction. When the two plug assemblies are inserted into each other, the two assemblies can be connected together through threads by rotating the nut 8, and the sealing ring is used to prevent the outside pressure from entering the inner cavity.

[0046] Furthermore, the specific connection structure of the connector 9 and the two connecting plugs 1 is as follows: both ends of the connector 9 are provided with plug rods adapted to the mounting grooves on the connecting plugs 1, and the end of the connector 9 corresponding to the male plug assembly 3 is threadedly connected to the inner wall of the male plug body 31 through a threaded structure, and a third sealing structure 14 is provided between the connector 9 and the inner wall of the male plug body 31.

[0047] The third sealing structure 14 is two annular grooves provided on the main body of the connector 9 , and O-rings are provided in both annular grooves for sealing.

[0048] The connector 9 is first fixedly connected to the male plug body 31 by a threaded connection, and then the male plug body 31 is fixed to the female connector 8 on the female plug assembly 4, so that the connector 9 can stably connect the two connecting plugs 1.

[0049] The connector 9 is connected to the main body through a thread. The joint of the connector 9 itself is the middle pin and is insulated from the outer shell of the connector 9. This part is a marked part and will not be described here.

[0050] Furthermore, a fourth sealing structure 15 is provided between the male plug body 31 and the exposed insulating layer 20 of the cut-off cable.

[0051] The fourth sealing structure 15 is composed of three sealing retaining rings arranged at intervals between the male plug body 31 and the insulating layer 20 of the cable extension end, and an O-ring is arranged between the two sealing retaining rings of the necklace. Here, a sealing group is composed of two O-rings and three sealing retaining rings, which ensures the seal between the insulating layer 20 and the shell. Due to the frequent use of the steel pipe, the outer stainless steel pipe may have subtle damage. After the locking ring group is sealed, the pressure will also enter the isolation layer 19 and the insulating layer 20 through the damaged outer steel pipe, which may cause a cable short circuit. Therefore, the purpose here is to prevent the steel pipe from being damaged, ensuring that the pressure cannot enter the cable core 2 through the insulating layer 20, thereby ensuring the insulation between the cable core 2 and the shell.

[0052] In the female plug assembly 4 , the female plug body 41 and the insulating layer 20 at the cable extension end are configured similarly, and are not described in detail here.

[0053] A first locking ring set is provided between the plug body and the connector 5. A second locking ring set is provided between the connector 5 and the pressure cap 6.

[0054] The lock ring assembly is a standard component, and its specific structure and installation method all adopt existing technology, which will not be described in detail here.

[0055] The locking ring assembly consists of two parts: a locking ring 16 and a sealing ring 17. During installation, the compression of the nut 7 causes the locking ring 16 and the sealing ring 17 to simultaneously contract and deform under the force of the inclined surface. The locking ring 16 bites into the outer surface of the stainless steel pipe and secures it. The sealing ring 17 also contacts the outer surface of the stainless steel pipe and forms a seal. The purpose of using the locking ring assembly together is to increase the locking force on the steel pipe and ensure that the quick connector can withstand greater tension after connection.

[0056] The first insulating sleeve 11 provided between the male plug body 31 and the connecting plug 1 in the male plug assembly 3 and the second insulating sleeve 12 provided between the pressure nut 7 and the connecting plug 1 in the female plug assembly 4 function to ensure insulation between the connecting plug 1 and the body.

[0057] The use of double-stage ferrules ensures the load-bearing performance of the steel pipe.

[0058] The overall sealing performance is further improved through secondary sealing of the insulating sleeve.

[0059] The use of the insulating sleeve and the connector 9 ensures the insulation performance between the cable core 2 and the housing.

[0060] After the male plug assembly 3 and the female plug assembly 4 are connected, they can be quickly docked.

[0061] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0062] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0063] The above description of the present invention is relatively specific and detailed through a general explanation and specific embodiments. It should be noted that variations and modifications to these specific embodiments are possible without departing from the spirit of the present invention, and all such variations and modifications fall within the scope of protection of this application. Therefore, the scope of protection of this patent application shall be determined by the appended claims.

Claims

1. A steel pipe cable connector, characterized in that: include: Two connecting plugs, the two connecting plugs are respectively connected to the cable cores of the two cut cables, and an installation groove is formed at one end of the connecting plug away from the connection end with the cable; Two plug assemblies, the two plug assemblies are respectively a male plug assembly and a female plug assembly, and the two plug assemblies are respectively used to seal the two cut cables and the connecting plugs connected to the cables; The plug assembly includes a plug body, a connector and a pressure cap, which are sequentially sleeved on the cable at the cable cutoff point. The plug body is sleeved on the outside of the connecting plug and the cable. The ends of the two plug bodies opposite to the connecting plugs are sealed and fixed by a connector nut and a pressure nut through a connector. The other end of the plug body is inserted into one end of the connector and the two are sealed. The other end of the connector is inserted into the pressure cap and the two are sealed.

2. The steel pipe cable connector according to claim 1, characterized in that: The outer side wall of one end where the two plug bodies are connected is configured as a three-layer stepped structure; The lowest step of the stepped structure of the male plug body of the male plug assembly is provided with a first sealing structure, and the middle step is provided with an external thread structure; The lowest step of the female plug body replacement structure of the female plug assembly is provided with an external thread for sleeved and threadedly connected to a pressure nut, and the height of the pressure nut is higher than the height of the lowest step, and an insulating sleeve is provided between the pressure nut and the connecting plug. The female connector is sleeved on the outside of the pressure nut and the female plug body, and the position corresponding to the middle step between the female connector and the female plug body protrudes inward to form a step and fits with the middle step of the female plug body. A second sealing structure is also provided on the middle step of the female plug body, and the inner side wall of the end where the female connector is connected to the male plug body is provided with an internal thread that matches it.

3. The steel pipe cable connector according to claim 2, characterized in that: Both ends of the connector are provided with plug rods that are compatible with the mounting grooves on the connecting plug. The end of the connector corresponding to the male plug assembly is threadedly connected to the inner wall of the male plug body through a threaded structure, and a third sealing structure is provided between the connector and the inner wall of the male plug body.

4. The steel pipe cable connector according to claim 3, characterized in that: A first insulating sleeve is provided between the male plug body and the connecting plug in the male plug assembly, and a second insulating sleeve is provided between the pressing nut and the connecting plug in the female plug assembly.

5. The steel pipe cable connector according to claim 4, characterized in that: A fourth sealing structure is provided between the male plug body and the exposed insulating layer of the cut-off cable.

6. The steel pipe cable connector according to claim 1, characterized in that: The plug body and the connector are threadedly connected via a threaded structure, and a first locking ring group is provided between the plug body and the connector.

7. The steel pipe cable connector according to claim 1, characterized in that: The connector and the pressure cap are threadedly connected via a threaded structure, and a second locking ring group is provided between the connector and the pressure cap.

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