Wire core intermediate joint and splicing method

Abstract

The application discloses a wire core intermediate joint and a connecting method thereof, which are used for connecting two wire cores and comprise two arc-shaped flow guide connecting pipes and at least one constant force binding spring. The arc-shaped flow guide connecting pipe is provided with a plurality of longitudinal through grooves, the longitudinal through grooves extend from one end of the arc-shaped flow guide connecting pipe to the other end, the butt joint ends of the two wire cores are welded together, the two arc-shaped flow guide connecting pipes are respectively wrapped from the two sides of the butt joint ends of the two wire cores and are closed together in butt joint, and the constant force binding spring is bound outside the two arc-shaped flow guide connecting pipes. The arc-shaped flow guide connecting pipe is bound and fixed by the constant force binding spring, the plurality of longitudinal through grooves can realize elastic contraction, the flow guide cross section is increased, the resistance at the wire core welding point is reduced, the heating problem is solved, and an auxiliary passage is provided for the conductor current; the persistent holding force provided by the constant force binding spring can make the arc-shaped flow guide connecting pipe and the wire core conductor realize the "same breathing" effect, so that the conductor creep and relaxation problems are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conductor jointing in the power industry, and in particular to a wire core intermediate joint and a jointing method. BACKGROUND

[0002] The failure rate of aluminum core cables and cable accessories during operation is high, especially in wind power projects, which brings great trouble to users. The reasons and mechanisms of the high failure rate of aluminum cables are as follows: the creep and stress relaxation of aluminum conductors are large, especially in the case of large load fluctuation or frequent switching, which can deepen the creep and relaxation, leading to local separation of the contact surface between the conductor and the fitting and thus contact deterioration, increasing connection resistance, and serious heating. The operating load of wind power plants is just fluctuating, so the aluminum core cable accessories in wind power projects will gradually show heating phenomenon and the situation will become more serious with the increase of operation time, eventually leading to accessory failure. The intermediate joint will heat more than the terminal head due to its own structure, poor heat dissipation and environmental factors. Many failures are mainly caused by the performance defects of aluminum core conductors (large creep and stress relaxation), and the fluctuation of wind power load and large current also magnify this defect.

[0003] The existing jointing process of aluminum conductors mainly includes two types: pressure bonding process (surrounding pressure or point pressure) and welding process. The above processes have their own shortcomings and cannot meet the long-term operation requirements of aluminum core cables.

[0004] The disadvantages and failure reasons of the pressure bonding process are as follows: 1. The aluminum core conductor itself has the defects of large creep and stress relaxation, which can deepen the creep and relaxation in the case of long-term operation or large load fluctuation or frequent switching, leading to local separation of the contact surface between the conductor and the fitting and thus contact deterioration, increasing connection resistance, and serious heating. 2. The aluminum connecting pipe is not pressed in place, causing large conductor resistance after pressure bonding and operation heating. The following situations occur: (1) In the case of non-standard production of aluminum cables, the outer diameter of the conductor core is small, which does not match the inner diameter of the national standard connecting pipe, resulting in large gap between the core and the connecting pipe, leading to tight pressure bonding; (2) The pressure die used on site does not match the connecting pipe or the pressure die does not meet the standard, which also leads to tight pressure bonding of the connecting pipe.

[0005] The disadvantages and failure reasons of the welding process are as follows: although the welding process can avoid the influence of the creep and stress relaxation of aluminum conductors, the contact resistance after welding is large, which cannot meet the requirements of long-term operation or short-term fault current, and eventually leads to heating.

[0006] Therefore, it is necessary to improve the conductor connection process of the existing aluminum core cable intermediate joint, and fundamentally solve the problems of conductor creep, relaxation and large welding contact resistance of the aluminum core cable intermediate joint in operation. SUMMARY

[0007] The main purpose of the present application is to provide a wire core intermediate joint which solves the problems of wire core conductor creep, relaxation and large welding contact resistance and improves stability and reliability.

[0008] In order to achieve the above purpose, the present application provides a wire core intermediate joint for connecting two wire cores, comprising two arc-shaped flow guide connecting pipes and at least one constant force binding spring, the arc-shaped flow guide connecting pipe is provided with a plurality of longitudinal through grooves, the longitudinal through grooves extend from one end of the arc-shaped flow guide connecting pipe to the other end to form a closed end and an open end, the two wire core butt joints are welded together, the two arc-shaped flow guide connecting pipes are respectively wrapped from both sides of the two wire core butt joint welding positions and are closed together, and the constant force binding spring is bound outside the two arc-shaped flow guide connecting pipes.

[0009] Preferably, the inner wall of the arc-shaped flow guide connecting pipe is provided with threads, a plurality of longitudinal ribs or a plurality of convex points.

[0010] Preferably, the wire core is an aluminum wire core, and the arc-shaped flow guide connecting pipe is an aluminum arc-shaped flow guide connecting pipe.

[0011] Preferably, the opening end of one of the two adjacent longitudinal through grooves and the opening end of the other adjacent longitudinal through groove are distributed at different ends of the arc-shaped flow guide connecting pipe.

[0012] The present application also provides a connection method of the wire core intermediate joint for connecting two wire cores together, characterized in that it comprises the following steps:

[0013] Firstly, the two wire cores are welded together by welding to complete the connection, which ensures the mechanical strength of the conductor and provides a main path for the conductor current;

[0014] Then, the two arc-shaped flow guide connecting pipes are respectively wrapped from both sides of the two wire core butt joint welding positions and are closed together;

[0015] Finally, the constant force binding spring is bound outside the two arc-shaped flow guide connecting pipes.

[0016] As described above, the two wire core butt ends of the wire core intermediate joint of the present application are welded together to ensure the mechanical tension resistance of the wire core conductor and provide the main passage for the wire core conductor current, the two arc-shaped current guide connecting pipes are respectively wrapped from both sides of the two wire core butt ends and closed together, the arc-shaped current guide connecting pipe is fixed by the constant force restraint spring, the longitudinal through grooves can realize elastic contraction, increase the current guide cross section, reduce the resistance at the wire core welding point, solve the heating problem, and provide an auxiliary passage for the conductor current; the persistent holding force provided by the constant force restraint spring can make the arc-shaped current guide connecting pipe and the wire core conductor realize the "same breathing" effect, thereby solving the conductor creep and relaxation problems that the ordinary surrounding pressure mode cannot solve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the wire core intermediate joint of the present application;

[0018] Figure 2 is Figure 1 a schematic diagram of the structure of the arc-shaped current guide connecting pipe of the wire core intermediate joint shown in the figure.

[0019] Figure 3 is Figure 1 a schematic diagram of the structure of the arc-shaped current guide connecting pipe of the wire core intermediate joint shown in the figure. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Please refer to Figure 1 , Figure 2 and Figure 3 , the wire core intermediate joint of the present application is used for connecting two wire cores and includes two arc-shaped current guide connecting pipes 10 and a plurality of constant force restraint springs 20.

[0023] The arc-shaped current guide connecting pipe 10 is provided with a plurality of longitudinal through grooves 11, and the longitudinal through grooves 11 extend from one end of the arc-shaped current guide connecting pipe 10 to the other end to form a one-end-closed one-end-opened shape.

[0024] The two wire cores 30 are welded together at the butt joint end to form a welding point 31, and the two arc-shaped flow guide connecting pipes 10 are respectively wrapped from both sides of the butt joint welding point 31 of the two wire cores 30 and closed together in abutment, and the constant force binding spring 20 is bound outside the two arc-shaped flow guide connecting pipes 10.

[0025] In the embodiment, the wire core 30 is an aluminum wire core, and the arc-shaped flow guide connecting pipe 30 is an aluminum arc-shaped flow guide connecting pipe.

[0026] As a further improvement of the embodiment, the inner wall of the arc-shaped flow guide connecting pipe 10 is provided with a thread 11. The thread 11 can tightly bite the conductor under the action of the constant force binding spring 20 to form a contact flow guide effect. It can be understood that the conductor biting effect is not limited to the thread 11, and a plurality of longitudinal ribs or a plurality of protrusions can be provided on the inner wall of the arc-shaped flow guide connecting pipe 10 to bite the conductor.

[0027] As a further improvement of the embodiment, the opening end of one of the two adjacent longitudinal through grooves 12 is distributed at a different end of the closable arc-shaped flow guide connecting pipe 10 from the opening end of the other longitudinal through groove 12.

[0028] The application also provides a connecting method of the wire core intermediate joint, which is used for connecting two wire cores together, and includes the following steps:

[0029] First, the two wire cores 30 are welded together by welding to complete the connection, so as to ensure the mechanical tension resistance of the wire core conductor and provide a main passage for the wire core conductor current;

[0030] Then, the two arc-shaped flow guide connecting pipes 10 are respectively wrapped from both sides of the butt joint welding point 31 of the two wire cores and closed together in abutment;

[0031] Finally, the constant force binding spring 20 is bound outside the two arc-shaped flow guide connecting pipes 10.

[0032] As described above, the two wire cores of the wire core intermediate joint are welded together at the butt joint end, so as to ensure the mechanical tension resistance of the wire core conductor and provide a main passage for the wire core conductor current, the arc-shaped flow guide connecting pipe 10 is bound and fixed by the constant force binding spring 20, the plurality of longitudinal through grooves 11 can realize elastic contraction, increase the flow guide cross section, reduce the resistance at the wire core welding point, solve the heating problem, and provide an auxiliary passage for the conductor current; and the constant force binding spring 20 provides a lasting holding force to enable the arc-shaped flow guide connecting pipe 10 and the wire core conductor to realize the "same breathing" effect, so as to solve the conductor creep and relaxation problems which are difficult to solve by the ordinary surrounding pressure method.

[0033] The above merely illustrates the preferred embodiments of the present application, and is not intended to limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in other related technical fields based on the content of the present application should be included in the patent protection scope of the present application.

Claims

1. A wire core intermediate connector for connecting two wire cores, characterized in that, The device includes two arc-shaped flow guiding connecting tubes and at least one constant force restraining spring. Each arc-shaped flow guiding connecting tube has several longitudinal through-slots extending from one end to the other, forming a closed-end and open-end shape. The two wire cores are welded together at their mating ends. The two arc-shaped flow guiding connecting tubes respectively cover and close together from both sides of the mating ends of the two wire cores. The constant force restraining spring is restrained on the outside of the two arc-shaped flow guiding connecting tubes. The inner wall of each arc-shaped flow guiding connecting tube has several longitudinal ribs. In two adjacent longitudinal through-slots, the open end of one longitudinal through-slot and the open end of the adjacent other longitudinal through-slot are located at different ends of the arc-shaped flow guiding connecting tube. The wire core is made of aluminum.

2. The wire core intermediate connector according to claim 1, characterized in that: The arc-shaped flow guide pipe is an aluminum arc-shaped flow guide pipe.

3. A method for splicing the wire core intermediate joint according to any one of claims 1 to 2, used to splice and connect two wire cores together, characterized in that, Includes the following steps: First, the two wire cores are welded together to complete the splicing. Then, the two arc-shaped flow guide connecting tubes are respectively wrapped around both sides of the welding joint of the two wire cores and closed together; Finally, the constant force restraint spring is restrained on the outside of the two arc-shaped flow guide connecting pipes.

Images