Field on-site convenient splicing joint for embedded cable composite pipe and connecting method of field on-site convenient splicing joint

Abstract

The invention discloses an embedded cable composite pipe field on-site convenient splicing joint and a connecting method thereof, and belongs to the technical field of embedded cable composite pipes, a combination body formed by a main flange and a core pipe in the splicing joint serves as a main supporting part of the embedded cable composite pipe, and cable penetrating connection grooves distributed in a circumferential array mode are formed in the circumferential direction of the main flange; a leading cable is connected in a penetrating manner; the clamping sleeve supporting body is supported on the end face of the main flange in a mortise joint mode, the clamping sleeve supporting body supports the front clamping sleeve towards the outer side in the axial direction, and the front clamping sleeve and the outer sleeve form a holding self-tightening connecting part. An inner step is arranged on the inner wall of the buckling sleeve and is in lap joint with an outer step arranged on the outer wall of the outer sleeve, the buckling sleeve is connected to the main flange through threads, and the outer sleeve is driven to retract inwards when the buckling sleeve is axially and inwards locked, so that a buckling part is formed. According to the connecting method, on-site repair splicing of the embedded cable composite pipe is completed through the splicing connector by using a pipe wrench tool under the condition that no hydraulic or electric tool exists. The problem of emergency connection of the embedded cable composite pipe when field conditions are limited is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite pipes with embedded cables, and in particular, relates to a convenient field joint for composite pipes with embedded cables and a connection method thereof. Background Art

[0002] The embedded cable composite pipe is currently widely used in the marine and oil and gas fields. Its ability to transport gas and liquid flow and establish power communication connections makes it have significant advantages in field engineering applications. However, in the field with harsh security conditions, especially in working conditions such as low temperature environment, high temperature fluid, lack of power support, and when the embedded cable composite pipe has unexpected local failures such as fracture and leakage, it is impossible to interrupt for a long time to wait for rescue, nor can it refer to the traditional composite pipe joint connection method, and carry a large volume of hydraulic crimping machine to crimp the metal joint. At this time, it is urgent to cut off the failed embedded cable composite pipe and reconnect the embedded cable composite pipe part that still has working ability to restore gas and liquid flow transmission and power communication connection to prevent more serious accidents. For this reason, it is necessary to design a joint for the continuation of embedded cable composite pipes to solve the emergency connection problem of embedded cable composite pipes when the field conditions are limited and the operators and operating equipment are limited. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned background technology, the purpose of the present invention is to provide a convenient field joint for an embedded cable composite pipe, and the designed joint has the ability to connect, carry, establish a fluid flow channel and communication and power connection. Another purpose of the present invention is to provide a method for quickly connecting an embedded cable composite pipe using the joint, which can be assembled by operators using non-powered tools in the field without the assistance of hydraulic or electric machinery and tools, thereby realizing the rapid connection of the embedded cable composite pipe.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a convenient field connecting joint for an embedded cable composite pipe is proposed, wherein the connecting joint is used to connect the embedded cable composite pipes on both sides thereof, and the connecting joint comprises a main flange, a core pipe, a ferrule support body, a front ferrule, an outer sleeve, a crimping sleeve, a connecting cable, a sealing ring and a packing nut.

[0005] A through hole for fluid circulation is provided in the middle of the main flange, and internal and external threads are respectively provided on the inner and outer sides of the main flange to connect with the core tube and the buckling sleeve. A sealing ring groove for installing a sealing ring is preset on the outer side of the main flange, and cable threading grooves distributed in a circular array are opened on the circumference of the main flange. The cable threading grooves are used for connecting the embedded cables of the cable composite tubes on both sides.

[0006] The central channel of the core tube serves as a liquid flow channel for fluid circulation. The outer diameters of the two ends of the core tube are different. The large outer diameter end is provided with an external thread connected to the main flange thread, and the small outer diameter end is provided with a toothed profile facing away from the main flange side. The toothed profile is used to cut into and hold the embedded cable composite tube to establish a connection with the embedded cable composite tube, and at the same time prevent the embedded cable composite tube from escaping from the connecting joint when the embedded cable composite tube is subjected to outward pulling force; the small outer diameter end of the core tube is provided with an introduction section with an outer diameter ranging from small to large, and the overall outer diameter of the small outer diameter end is smaller than the inner diameter of the embedded cable composite tube to ensure that when used in a low temperature environment, the embedded cable composite tube can still be sleeved on the core tube when it is deformed and shrunk due to thermal expansion and contraction; the core tube is preset with two sealing ring grooves for installing sealing rings, and their positions correspond to the position where the front ferrule holds the embedded cable composite tube tightly.

[0007] One end of the ferrule support is connected to the end face of the main flange by a groove and tenon joint, and the other end is connected to the end face of the supporting front ferrule by a groove and tenon joint, thereby limiting the movement of the front ferrule toward the main flange while forming a closed space with the main flange to provide storage space for the connecting cables.

[0008] The inner side of the front ferrule is provided with a toothed profile facing away from the main flange side, which is used to cut into and hold the embedded cable composite tube; the tapered design of the outer side of the front ferrule matches the taper of the inner side of the outer sleeve, and a gap is provided in the circumferential direction of the front ferrule to reserve tightening space.

[0009] A stuffing box groove for installing a sealing ring is preset on the side of the outer sleeve away from the main flange, and the sealing ring in the stuffing box groove is compressed by a stuffing nut; an outer step is provided on the outer wall of the outer sleeve to overlap with the inner step of the buckling sleeve.

[0010] The inner wall of the pressing sleeve close to the main flange is provided with internal threads for butting against the main flange.

[0011] The specific connection method is: Install sealing rings in the preset sealing ring groove of the main flange, the two preset sealing ring grooves of the core tube, and the preset stuffing box groove of the outer sleeve respectively; process the end faces of the embedded cable composite tubes on both sides to be connected to be flat, separate the cable ends of the embedded cable composite tubes, and put stuffing nuts, buckling sleeves, outer sleeves, front ferrules and ferrule supports on the ends of the embedded cable composite tubes on both sides in sequence; the two sides of the main flange are connected to the two core tubes with threads, and the two core tubes are inserted into the ends of the embedded cable composite tubes on both sides respectively; connect the lead wires through the cable threading groove, The cable is connected to the cable ends separated from the embedded cable composite tubes on both sides, and then the two ends of the ferrule support are aligned with the end faces of the main flange and the front ferrule through the groove joint method; the inner step of the inner wall of the buckle sleeve overlaps the outer step set on the outer wall of the outer sleeve; the buckle sleeve is tightened along the main flange thread with a pipe clamp, and the buckle sleeve drives the outer sleeve to tighten toward the main flange; the outer sleeve and the front ferrule are matched with the taper, and under the restriction of the ferrule support, the front ferrule shrinks toward the center, and the toothed contour on the inside of the front ferrule cuts into and holds the embedded cable composite tube to establish a connection. At the same time, the splice also has a self-tightening function. When the embedded cable composite tube has a tendency to fall out, the front ferrule will further shrink under the design of matching the taper of the outer sleeve to enhance the stability of the connection.

[0012] During the tightening process, the crimping sleeve is overlapped with the outer sleeve only through a step, so as to prevent the outer sleeve from rotating and driving the ferrule support body to rotate, thereby shearing the connected connecting cable.

[0013] The convenient field joint for connecting the embedded cable composite tube designed by the present invention takes into account that the embedded cable composite tube to be connected may be used for high-temperature and high-pressure fluid transportation in a low-temperature environment. Due to the large temperature difference and the large internal and external pressure difference, the embedded cable composite tube may be significantly deformed. The buckling position of the front ferrule is aligned with the positions of the two sealing ring grooves of the core tube, so that the embedded cable composite tube will be compressed and deformed inward during the shrinkage and clamping process of the front ferrule, and the sealing area of ​​the sealing ring will be further compressed, so that the inner wall of the embedded cable composite tube in this area is more closely fitted with the toothed contour of the core tube, thereby increasing the sealing contact area and contact pressure of the sealing ring, improving the sealing pressure-bearing effect, and improving the fixed connection effect of the toothed contour; in addition, by adjusting the tightening distance of the buckling sleeve toward the main flange side, the tightening distance of the inner side of the outer sleeve can be controlled, and then the shrinkage distance of the front ferrule toward the center can be controlled, thereby controlling the shrinkage and clamping effect of the front ferrule and the embedded cable composite tube and controlling the sealing effect of the joint connection.

[0014] The field convenient joint for the embedded cable composite pipe designed by the present invention also takes into account the connection and sealing issues of the embedded cables. The embedded cable and the connecting cable of the embedded cable composite pipe are connected in the cable threading groove preset in the main flange, and the packing is sealed to meet the waterproof and insulation requirements. After the built-in cable head of the embedded cable composite pipe is heat-shrink connected with the heat-shrinkable solder sleeve and the connecting cable, it is placed in the cable threading groove preset in the main flange to further ensure the reliability of the cable connection.

[0015] The convenient field joint for embedded cable composite pipes designed by the present invention also takes into account the problem of limited space in the hole in the field of oil and gas engineering. When the embedded cable composite pipe is used in application scenarios such as rodless oil production, the hole diameter is limited, and the passing diameter of the lifting and clamping equipment of the ground embedded cable composite pipe is also limited. Therefore, the designed convenient field joint for embedded cable composite pipes compresses the overall volume and maximum outer diameter of the joint by adjusting the volume of each component, so that the joint meets the passing diameter requirements of the equipment and the diameter requirements for entering the hole.

[0016] The field convenient joint for the embedded cable composite pipe designed by the present invention also takes into account the field installation, and there may be installation difficulties in the process of guiding and sleeve-joining the embedded cable composite pipe to the core pipe. During field installation, the embedded cable composite pipe may be deformed due to the load and ambient temperature during use, and problems such as reduced inner diameter or excessive ovality may occur; when the embedded cable composite pipe is guided and sleeved to the core pipe, the mismatch of inner and outer diameters causes installation difficulties. Therefore, an auxiliary tool is designed for the convenient field joint installation of the embedded cable composite pipe. The auxiliary tool consists of a half joint, a screw rod, a nut and a fastening bolt. The half joint is pre-set with multiple bolt installation holes. The fastening bolts are installed and tightened at the bolt installation holes to achieve the closing of the half joint and hold the outer wall of the embedded cable composite pipe tightly. The half joint is provided with a screw through hole for the screw rod to pass through. The inner side of the half joint is provided with a buckle for holding the outer wall of the embedded cable composite pipe. When used, the embedded cable composite pipe and the core pipe to be connected on both sides are preliminarily sleeved, and then two half joints are installed to the embedded cable composite pipes to be connected on both sides. There are two screw rods, and the two screw rods are arranged parallel to each other. The screw rods are passed through the screw through holes, and then nuts are installed on the outer sides of the two half joints. By tightening the nuts, the half joint is forced to drive the embedded cable composite pipe to move closer to the side of the core pipe near the main flange through the buckle teeth to complete the sleeve connection of the embedded cable composite pipe. After the auxiliary tool is used, it is disassembled by removing the nuts and fastening bolts.

[0017] Through the above design scheme, the present invention can bring the following beneficial effects: The convenient field splicing joint for the embedded cable composite pipe designed by the present invention can be used to complete the field emergency splicing of the embedded cable composite pipe by using a pipe clamp tool without hydraulic or electric tools.

[0018] Secondly, the present invention ensures the fixed connection between the connecting joint and the embedded cable composite tubes on both sides through the conical locking structure of the front ferrule. At the same time, the conical design can realize the self-tightening of the embedded cable composite tube when it is disengaged outward after connection, as well as the tightening under large temperature difference and high pressure conditions, further improving the connection effect.

[0019] Thirdly, the present invention realizes the docking and subsequent operation of the embedded cables in the embedded cable composite pipe by presetting the cable connection space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A full cross-sectional view of the embedded cable composite pipe after the field convenient joint connection is completed; Figure 2 This is a three-quarter cross-sectional view of the field-mounted convenient joint of the embedded cable composite pipe after assembly; Figure 3 This is an exploded view of the convenient field joint connection of the embedded cable composite pipe; Figure 4 A schematic diagram of the structure of the embedded cable composite pipe splicing is provided to use auxiliary tools in conjunction with the embedded cable composite pipe to conveniently splice joints on site.

[0021] The markings in the figure are as follows: 1-main flange; 2-core tube; 3-ferrule support; 4-front ferrule; 5-outer sleeve; 6-pressing sleeve; 7-connecting cable; 8a-sealing ring one; 8b-sealing ring two; 8c-sealing ring three; 8d-sealing ring four; 9-packing nut; 10a-half joint; 10b-screw; 10c-nut; 10d-fastening bolt. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. In order to avoid confusing the essence of the present invention, known methods, processes, processes, components and circuits are not described in detail.

[0023] like Figure 1 , Figure 2 and Figure 3As shown, the field convenient joint for embedded cable composite pipe includes a main flange 1, a core tube 2, a ferrule support 3, a front ferrule 4, an outer sleeve 5, a buckling sleeve 6, a connecting cable 7, a sealing ring and a packing nut 9. The main flange 1, the core tube 2, the ferrule support 3, the front ferrule 4, the outer sleeve 5 and the buckling sleeve 6 are all made of stainless steel. The sealing ring includes a sealing ring 1 8a, a sealing ring 2 8b, a sealing ring 3 8c and a sealing ring 4 8d.

[0024] Figure 1 It shows the full cross-section view of the field convenient joint of the embedded cable composite pipe after assembly. Figure 2 It shows a three-quarter sectional view of the embedded cable composite pipe after the field convenient connection joint is assembled; the concept of the three-quarter sectional view is: imagine using a cutting plane to cut off one-quarter of the machine part to show the internal structure, and the remaining three-quarters retain the external shape, taking into account the expression of both internal and external shapes. Figure 3 The exploded view of the convenient field connection joint of the embedded cable composite pipe is shown.

[0025] The core tube 2, the ferrule support body 3, the front ferrule 4, the outer sleeve 5, the buckling sleeve 6 and the packing nut 9 together constitute an assembly, and the number of the assembly is two sets, and the two sets of assemblies correspond to the embedded cable composite tubes on both sides respectively.

[0026] Liquid flow channels are opened in the center of the main flange 1 and the center of the core tube 2, and the hot water in the embedded cable composite tube flows through the liquid flow channel established by the core tube 2 and the main flange 1. The main flange 1 is circumferentially provided with cable connection grooves distributed in a circumferential array for connecting the connecting cable 7. The combination of the main flange 1 and the core tube 2 serves as the main supporting part of the embedded cable composite tube; the ferrule support body 3 is supported on the end face of the main flange 1 by a groove and tenon joint, and the ferrule support body 3 supports the front ferrule 4 axially outward by a groove and tenon joint, and the front ferrule 4 and the outer sleeve 5 form a holding self-tightening connection part; the inner wall of the buckling sleeve 6 is provided with an inner step, which is overlapped with the outer step set on the outer wall of the outer sleeve 5, and the buckling sleeve 6 is connected to the main flange 1 by a thread, and drives the outer sleeve 5 to retract when it is locked axially inward to form a buckling part.

[0027] When in use, first process the end faces of the embedded cable composite pipes on both sides to be connected into flat surfaces, separate the cable ends of the embedded cable composite pipes, and put the stuffing nut 9, the buckling sleeve 6, the outer sleeve 5, the front ferrule 4, the ferrule support body 3 and the matching sealing ring on the end of the embedded cable composite pipe to prepare for the joint connection.

[0028] like Figure 1 and Figure 2 As shown, the main flange 1 is connected to the two core tubes 2 on both sides thereof by threads, and a welding groove is provided on the outside of the through hole of the main flange 1 so as to perform pressure welding after the threads are tightened into place to ensure the sealing of the liquid flow channel inside the joint.

[0029] likeFigure 1 and Figure 2 As shown, the two sealing ring grooves preset in the core tube 2 are used to install the sealing ring 1 8a and the sealing ring 2 8b respectively. The embedded cable composite tube is sleeved along the outer wall of the core tube 2. Through the cable threading groove, the lead cable 7 is connected to the cable ends separated from the embedded cable composite tubes on both sides. Then, the outer tenon of the ferrule support body 3 is aligned with the docking groove set on the end face of the main flange 1, and the sleeve is connected to the bottom. The docking groove of the front ferrule 4 is aligned with the outer tenon of the ferrule support body 3, and the sleeve is in place.

[0030] like Figure 1 and Figure 2 As shown, the inner step of the inner wall of the buckle sleeve 6 overlaps the outer step set on the outer wall of the outer sleeve 5. The buckle sleeve 6 is connected to the main flange 1 through threads. When it is locked axially inward, it drives the outer sleeve 5 to retract. The taper of the inner wall of the outer sleeve 5 is consistent with the taper of the outer surface of the front ferrule 4. During the retraction process of the outer sleeve 5, the front ferrule 4 is pressed inward to tighten. The toothed profile set in the front ferrule 4 is pressed into the outer surface of the embedded cable composite pipe, thereby establishing a connection. The outer sleeve 5 is inserted into the main flange 1, and the sealing ring 3 8c is installed in the sealing ring groove of the main flange 1. The outer sleeve 5 presses the sealing ring 3 8c during the tightening process, thereby meeting the external sealing here. In addition, when the embedded cable composite tube tends to fall outward, the front ferrule 4 will move outward driven by the embedded cable composite tube. At this time, due to the tapered design of the front ferrule 4 and the outer sleeve 5, the front ferrule 4 will further shrink and hold the embedded cable composite tube tightly, thereby achieving the designed self-tightening effect; the outer sleeve 5 is provided with a stuffing box groove for installing a sealing ring four 8d on the side away from the main flange 1, and the stuffing nut 9 is connected to the inner wall of the outer sleeve 5 through a thread, and compresses the sealing ring four 8d when tightened inward along the axis. The sealing ring four 8d expands radially under axial pressure, thereby realizing the sealing of the outer surface of the embedded cable composite tube to the outside.

[0031] Preferably, in order to adjust the buckling and clamping effect, the front ferrule 4 can adjust the buckling amount and the tooth cutting depth by adjusting the circumferential gap, the tooth profile depth, and the tooth angle, thereby adjusting the buckling and clamping effect.

[0032] When in use, the connection method between the lead cable 7 and the cable end is selected according to the site conditions. When the site has welding conditions, welding connection can be used. When the site does not have welding conditions, terminal connection can be selected, and heat shrink solder sleeve can be used for sealing protection.

[0033] When in use, the cable connection groove may be filled with sealant to isolate the connecting cable 7 from the metal part and the outside world.

[0034] During use, if it is difficult to sleeve the embedded cable composite tube to the core tube 2, an auxiliary tool can be used to sleeve the embedded cable composite tube, such as Figure 4As shown, during use, first preliminarily sleeve the inner-embedded cable composite pipes and the core pipe 2 on both sides. Subsequently, install two split couplings 10a on the inner-embedded cable composite pipes to be connected on both sides. The split couplings 10a are pre-provided with a plurality of bolt mounting holes. At the same time, screw-through holes for screws are provided on the split couplings 10a. Install and tighten the fastening bolts 10d at the bolt mounting holes to achieve the closing of the split couplings 10a and clamp the outer wall of the inner-embedded cable composite pipe. Subsequently, pass the screw 10b through the screw-through hole of the split coupling 10a, and install nuts 10c on the outer sides of the two split couplings 10a. By tightening the nuts 10c, force the split coupling 10a to drive the inner-embedded cable composite pipe to approach the side of the core pipe 2 near the main flange 1 through the engaging teeth, thus completing the sleeving of the inner-embedded cable composite pipe. After the auxiliary tool is used up, unscrew the nuts 10c in sequence, pull out the screw 10b, remove the fastening bolts 10d, and remove the split couplings 10a, thereby removing the auxiliary tool without hindering the next installation and use. In addition, when it is difficult to tighten the outer sleeve 5 during the installation process, the auxiliary tool can adjust the distance between the split couplings 10a and the pre-tightening force of the fastening bolts 10d. Loosen the connection fastening bolts 10d of the split couplings 10a to release the clamping of the outer wall of the inner-embedded cable composite pipe by the split couplings 10a, push the end face of the split coupling 10a near the outer sleeve 5 to the outer end face of the outer sleeve 5, and tighten the nuts 10c to achieve the effect of the auxiliary tool assisting in the tightening and installation of the outer sleeve 5.

[0035] Preferably, the first seal ring 8a, the second seal ring 8b, the third seal ring 8c, and the fourth seal ring 8d can be made of hydrogenated nitrile rubber or polytetrafluoroethylene to meet the requirements of high and low temperature resistance in different environments.

[0036] Preferably, the surface of the swaging sleeve 6 can be subjected to surface knurling treatment or processed into structures such as six-sided or eight-sided according to the requirements of the tools used at the target site to cooperate with the clamping or holding requirements of the corresponding tools.

[0037] Preferably, different materials and structures of packing can be selected at the fourth seal ring 8d according to the needs of different external environments.

[0038] To evaluate the working performance of the convenient field splicing joint of the embedded cable composite pipe, sample processing and testing were carried out. The embedded cable composite pipe for test connection is a fiber-reinforced embedded cable composite pipe, with a designed inner diameter of 40 mm, a designed outer diameter of 68 mm, a designed maximum tensile load of 100 kN, and a designed working pressure of 12 MPa. The inner and outer lining layers are made of nylon material, the fiber-reinforced layer is made of aramid fiber pre-impregnated yarn tape, laid according to the double ply angle system, polyamide PA is selected as the matrix material, and the embedded cable is laid by circumferential winding. The size of the trial-produced joint sample is produced according to the size of the embedded cable composite pipe for test connection, and the material is stainless steel S31603. By connecting the convenient field splicing joint of the embedded cable composite pipe with the embedded cable composite pipe for test, using a tensile testing machine to stretch both ends of the sample pipe for tensile test, and after placing the combination of the embedded cable composite pipe and the splicing joint in a 90 °C water bath for 4 h to simulate the use condition, using a pressure testing machine to pressurize the closed combination of the embedded cable composite pipe and the splicing joint to conduct an internal pressure resistance test to evaluate the connection tensile performance and sealing performance of the convenient field connection splicing joint of the embedded cable composite pipe.

[0039] After testing, when the convenient field splicing joint of the embedded cable composite pipe is connected with the embedded cable composite pipe for test connection, its maximum tensile load is higher than that of the embedded cable composite pipe for test connection; the maximum sealing pressure is higher than the designed working pressure of the embedded cable composite pipe for test connection, meeting the use requirements of the embedded cable composite pipe for test connection.

[0040] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A convenient field joint for an embedded cable composite pipe, which is used to connect the embedded cable composite pipes on both sides, and is characterized in that: The connecting joint comprises: a main flange (1), a core tube (2), a ferrule support body (3), a front ferrule (4), an outer sleeve (5), a buckling sleeve (6), a connecting cable (7), a sealing ring and a packing nut (9); a through hole for fluid circulation is provided in the middle of the main flange (1); an internal thread for threaded connection with the core tube (2) is provided on the inner side of the main flange (1); an external thread for threaded cooperation with the buckling sleeve (6) is provided on the outer side of the main flange (1); a sealing ring groove for installing the sealing ring is preset on the outer side of the main flange (1); and cable threading grooves distributed in a circumferential array are provided on the circumference of the main flange (1). The cable connection groove is used for connecting the cable (7) to the embedded cables of the cable-embedded composite tubes on both sides; the central channel of the core tube (2) serves as a flow channel for the flow of fluid; the two ends of the core tube (2) have different outer diameters; the large outer diameter end is provided with an external thread for threaded connection with the main flange (1); the small outer diameter end is provided with a toothed profile facing away from the main flange (1), and the toothed profile is used to cut into and hold the embedded cable composite tube; two sealing ring grooves for installing sealing rings are preset on the core tube (2), and the positions of the two sealing ring grooves correspond to the positions of the front ferrule (4) buckling and holding the embedded cable composite tube; the ferrule support One end of the body (3) is connected to the end face of the main flange (1) by means of a groove and tenon joint, and the other end is connected to the end face of the supporting front ferrule (4) by means of a groove and tenon joint. The ferrule support body (3) is used to limit the movement of the front ferrule (4) toward the main flange (1). At the same time, the ferrule support body (3) and the main flange (1) cooperate with each other to form a closed space, which is used to store the connecting cable (7); the inner side of the front ferrule (4) is provided with a toothed profile facing away from the main flange (1), and the toothed profile is used to cut into and hold the embedded cable composite tube. The outer side of the front ferrule (4) is conical, and the conical The outer sleeve (5) is tapered to match the inner side of the outer sleeve (5); the front ferrule (4) is provided with a slit in the circumferential direction; the outer sleeve (5) is provided with a stuffing box groove for installing a sealing ring on the side away from the main flange (1), and the outer wall of the outer sleeve (5) is provided with an outer step; the pressing sleeve (6) has an inner step, which is used to overlap with the outer step of the outer sleeve (5), and the inner wall of the pressing sleeve (6) close to the main flange (1) is provided with an internal thread that matches the thread of the main flange (1); the packing nut (9) is threadedly connected to the inner wall of the outer sleeve (5), and the packing nut (9) is tightened inwardly along the axis to compress the sealing ring in the stuffing box groove.

2. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: A welding groove is provided on the outer side of the through hole of the main flange (1).

3. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: The core tube (2) is provided with an introduction section with an outer diameter increasing from small to large at the small outer diameter end, and the overall outer diameter of the small outer diameter end is smaller than the inner diameter of the embedded cable composite tube.

4. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: Both ends of the ferrule support body (3) are provided with outwardly extending tenons, and the outwardly extending tenons at both ends of the ferrule support body (3) are respectively adapted to the docking grooves provided on the end faces of the main flange (1) and the front ferrule (4).

5. The field convenient joint for composite pipe with embedded cable according to claim 4 is characterized by: The cross-sectional shape of the outwardly extending tenon is one of a rectangle, a trapezoid or a circle.

6. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: The surface of the buckling sleeve (6) is formed with knurling.

7. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: The outer contour of the buckling sleeve (6) is a hexahedral structure or an octahedral structure.

8. The field convenient joint for composite pipe with embedded cable according to claim 1 is characterized by: The connecting joint is equipped with an auxiliary tool (10), which comprises a half joint (10a), a screw rod (10b), a nut (10c) and a fastening bolt (10d). The half joint (10a) is provided with a bolt installation hole and a screw rod through hole. The inner side of the half joint (10a) is provided with a buckle for holding the outer wall of the embedded cable composite tube. There are two half joints (10a) and two nuts (10c). The two half joints (10a) are respectively installed on the embedded cable composite tubes on both sides. The fastening bolt (10d) is installed on the half joint (10a) through the bolt installation hole and tightened, so that the half joint (10a) is closed and holds the outer wall of the embedded cable composite tube. There are two screw rods (10b). The two screw rods (10b) are arranged parallel to each other, and the two ends of the screw rod (10b) respectively pass through the screw rod through holes of the two half joints (10a) and are locked by the nuts (10c).

9. A method for connecting an embedded cable composite pipe using the field convenient joint for an embedded cable composite pipe according to any one of claims 1 to 8, characterized in that: include: Sealing rings are respectively installed in a sealing ring groove preset in the main flange (1), two sealing ring grooves preset in the core tube (2), and a stuffing box groove preset in the outer sleeve (5); Process the end faces of the two embedded cable composite pipes to be connected into flat surfaces, separate the cable ends of the embedded cable composite pipes, and sleeve the packing nut (9), the buckling sleeve (6), the outer sleeve (5), the front ferrule (4) and the ferrule support body (3) on the two embedded cable composite pipe ends in sequence; The two sides of the main flange (1) are respectively connected to the two core tubes (2) by using threads, and the two core tubes (2) are respectively inserted into the ends of the embedded cable composite tubes on both sides; the lead cable (7) is connected to the cable ends separated from the embedded cable composite tubes on both sides through the cable threading groove, and then the two ends of the ferrule support body (3) are respectively aligned with the end faces of the main flange (1) and the front ferrule (4) by means of groove and tenon joint; the inner step of the inner wall of the buckling sleeve (6) is overlapped with the outer step provided on the outer wall of the outer sleeve (5); The crimping sleeve (6) is tightened along the thread of the main flange (1) by using a pipe clamp, and the crimping sleeve (6) drives the outer sleeve (5) to be tightened toward one side of the main flange (1); the outer sleeve (5) is matched with the taper of the front ferrule (4), and under the restriction of the ferrule support body (3), the front ferrule (4) shrinks toward the center, and the inner toothed profile of the front ferrule (4) cuts into and holds the embedded cable composite pipe to establish a connection.

Images