Copper-aluminum cable transition joint suitable for high voltage
By designing a transition joint for high voltage copper-aluminum cables, using a combined structure of conductor connection pipe, aluminum core cable, copper core cable and shear bolts, the problems of unstable joint quality and electrochemical corrosion when the aluminum conductor is connected to the copper conductor are solved, and stable connection and high safety performance are achieved.
Patent Information
- Application Number
- CN202421598544.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the prior art, the connection between aluminum conductors and copper conductors has problems such as unstable joint quality, looseness, and fracture, and the welding method has problems such as stress generation, conductive properties and mechanical strength affected.
A high-voltage copper-aluminum cable transition joint is designed, and a combined structure of conductor connection pipe, aluminum core cable, copper core cable and shear bolts is adopted. Through the coordination of partition plate and shear bolts, a stable connection between aluminum core cable and copper core cable is achieved, avoiding direct contact to reduce electrochemical corrosion.
The stable connection between aluminum-aluminum and copper-aluminum cables is achieved, reducing the risk of unstable construction difficulty and joint quality, avoiding electrochemical corrosion, and improving safety performance and connection quality.
Smart Images
Figure CN222775603U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical equipment, in particular to a copper-aluminum cable transition joint suitable for high voltage. Background Art
[0002] The wiring terminals of electrical equipment are usually made of copper, while aluminum has become the most commonly used cable material due to its advantages such as easy availability and light weight. However, since the direct electrode potentials of copper and aluminum are very different, when the aluminum wire is directly connected to the copper connection end, a galvanic reaction is easily generated, causing electrochemical corrosion of the aluminum wire. When the electrical device is running for a long time, overloaded or short-circuited, it is very easy to cause safety accidents. Especially in some application scenarios, it is necessary to connect the aluminum wire to the copper wire. At this time, the wires cannot be connected directly, and a switching structure is required to connect the aluminum wire and the copper wire in series.
[0003] Domestic transfer structures generally use crimping to connect aluminum wires and copper wires. However, the hardness of aluminum conductors is low and they are easily deformed during crimping. Moreover, when crimping in practice, heavy equipment such as hydraulic crimping or welding equipment is required, and the construction environment may affect the welding quality. In addition, during the crimping process, the quality of the crimping is affected by the technical level of the workers, and it is easy to have unstable quality. For example, if the crimping force is insufficient or excessive, it will lead to unstable joint quality, looseness, breakage and other problems.
[0004] In addition, when copper and aluminum conductors are connected by welding, due to the large difference in thermal expansion coefficients between copper and aluminum, stress is easily generated during the welding process, resulting in cracks at the joints, which will seriously affect the conductivity and mechanical strength of the joints. At the same time, copper-aluminum welding requires the use of special welding materials and equipment, which makes the welding cost relatively high. Due to the difficulty of welding, the technical requirements for workers are also high, which further increases the cost. Utility Model Content
[0005] The utility model provides a copper-aluminum cable transition joint suitable for high voltage, which is used to solve the defects in the prior art that when the aluminum wire and the copper wire are connected by crimping, the on-site construction is difficult, the joint quality is unstable, loose, and broken, and when the aluminum wire and the copper wire are connected by welding, the connection quality is poor.
[0006] The utility model provides a copper-aluminum cable transition joint suitable for high voltage, comprising: a conductor connecting pipe, an aluminum core cable, a copper core cable and a plurality of shear bolts, wherein:
[0007] The conductor connecting tube has a tube cavity, a partition plate is provided in the middle of the tube cavity, and the partition plate divides the tube cavity into a first connecting cavity and a second connecting cavity. The tube wall of the conductor connecting tube is provided with a first bolt hole and a second bolt hole, the first bolt hole penetrates into the first connecting cavity, and the second bolt hole penetrates into the second connecting cavity.
[0008] The aluminum core cable is inserted into the first connecting cavity, the copper core cable is inserted into the second connecting cavity, some of the shear bolts are threadedly connected to the first bolt holes and abut against the aluminum core cable, and some of the shear bolts are threadedly connected to the second bolt holes and abut against the copper core cable.
[0009] According to the utility model, a copper-aluminum cable transition joint suitable for high voltage is provided, which also includes a rubber preformed body, which is sleeved on the outer circumference of the conductor connecting tube, and the two ends of the rubber preformed body can at least partially cover the aluminum core cable and the copper core cable.
[0010] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the first bolt hole and the second bolt hole are symmetrically arranged relative to the partition plate.
[0011] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the first bolt holes are arranged at intervals along the circumferential direction of the conductor connection tube and at intervals along the length direction of the conductor connection tube;
[0012] The second bolt holes are arranged at intervals along the circumferential direction of the conductor connection tube and are arranged at intervals along the longitudinal direction of the conductor connection tube.
[0013] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the number of turns of the first bolt hole in the length direction of the conductor connecting tube is two to four, and the number of turns of the second bolt hole in the length direction of the conductor connecting tube is two to four.
[0014] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, in the circumferential direction of the conductor connecting tube, the number of the first bolt holes per circle is three to six, and the number of the second bolt holes per circle is three to six.
[0015] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the conductor connecting tube is made of aluminum alloy, and the surface is tin-plated, and the thickness of the tin is 10 to 15 mm.
[0016] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the thickness of the partition plate in the length direction of the conductor connecting tube is 4 to 8 mm.
[0017] According to a copper-aluminum cable transition joint suitable for high voltage provided by the utility model, the shear bolt is made of brass, and the surface is tin-plated, and the thickness of the tin is 10 to 15 mm.
[0018] The utility model provides a copper-aluminum cable transition joint suitable for high voltage, including: a conductor connection tube, an aluminum core cable, a copper core cable and a plurality of shear bolts. During the connection process, the aluminum core cable and the copper core cable can be fixed to the conductor connection tube with the help of the shear bolts. Only a torque wrench is required for connection, and no heavy equipment such as hydraulic crimping or welding equipment is required. The requirements for personnel are low, product failures due to poor construction can be avoided, and the connection quality can be guaranteed. Moreover, the aluminum core cable and the copper core cable are separated by a partition board, which can avoid electrochemical corrosion of the copper-aluminum transition surface and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.
[0020] Figure 1 It is a schematic structural diagram of a copper-aluminum cable transition joint suitable for high voltage according to one embodiment of the utility model.
[0021] Figure 2 yes Figure 1 The schematic diagram of the structure of the conductor connecting tube in the copper-aluminum cable transition joint suitable for high voltage is shown.
[0022] Reference numerals:
[0023] 1. Conductor connecting tube; 2. Aluminum core cable; 3. Copper core cable; 4. Shear bolt; 5. Partition plate; 6. First bolt hole; 7. Second bolt hole; 8. Rubber prefabricated body. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] In one embodiment of the utility model, a copper-aluminum cable transition joint suitable for high voltage is provided. Compared with the existing crimping or welding methods, the joint can use bolts to connect aluminum core cables and copper core cables, has low manufacturing difficulty, and can effectively overcome the defects of crimping cracks and poor conductor welding caused by crimping or welding. Figure 1 and Figure 2 The figure further describes the copper-aluminum cable transition joint suitable for high voltage in this embodiment.
[0026] Specifically, if Figure 1 and Figure 2 As shown, the copper-aluminum cable transition joint suitable for high voltage in this embodiment includes: a conductor connecting tube 1, an aluminum core cable 2, a copper core cable 3 and a plurality of shear bolts 4.
[0027] Among them, the conductor connecting tube 1 has a tube cavity, and a partition plate 5 is arranged in the middle of the tube cavity, and the partition plate 5 divides the tube cavity into a first connecting cavity and a second connecting cavity. The tube wall of the conductor connecting tube 1 is provided with a first bolt hole 6 and a second bolt hole 7. The first bolt hole 6 penetrates into the first connecting cavity, and the second bolt hole 7 penetrates into the second connecting cavity.
[0028] The aluminum core cable 2 is inserted into the first connecting cavity, the copper core cable 3 is inserted into the second connecting cavity, some shear bolts 4 are threadedly connected to the first bolt holes 6 and abut against the aluminum core cable 2, and some shear bolts 4 are threadedly connected to the second bolt holes 7 and abut against the copper core cable 3.
[0029] For example, Figure 2 As shown, the conductor connection tube 1 can be constructed as a tubular structure with a certain length, with a tube cavity inside, and a partition plate 5 is provided in the middle of the tube cavity. The partition plate 5 can be integrally formed with the tube wall of the conductor connection tube 1, and the partition plate 5 divides the tube cavity into two parts along the length direction of the conductor connection tube 1, namely, a first connection cavity and a second connection cavity. In addition, the conductor connection tube 1 is provided with a first bolt hole 6 penetrating to the first connection cavity along its radial direction, and a second bolt hole 7 penetrating to the second connection cavity.
[0030] Moreover, in order to achieve the transmission of electric energy, the conductor connecting tube 1 is made of metal material, for example, the conductor connecting tube 1 is made of aluminum alloy, and the surface is tin-plated, and the thickness of the tin plating can be 10 to 15 mm. It can be understood that tin has good corrosion resistance, so tin plating can protect the metal surface from oxidation and corrosion, and extend the service life of the material. Moreover, tin has good electrical conductivity, and tin plating can improve the electrical conductivity of the material.
[0031] Optionally, the thickness of the partition plate 5 in the length direction of the conductor connection tube 1 is 4 to 8 mm. That is, the thickness of the partition plate 5 can be selected from 4 to 8 mm according to the overall specifications of the conductor connection tube 1.
[0032] The core layer of the aluminum core cable 2 is an aluminum conductor, and the cladding is an insulating layer. The aluminum conductor in the aluminum core cable 2 can be inserted into the first connecting cavity, and then the shear bolt 4 can be threadedly connected to the first bolt hole 6 and abut against the aluminum conductor, thereby realizing the connection between the aluminum core cable 2 and the conductor connecting tube 1.
[0033] The core layer of the copper core cable 3 is a copper conductor, and the cladding is an insulating layer. The copper conductor in the copper core cable 3 can be inserted into the second connecting cavity. After that, the shear bolt 4 can be threadedly connected to the second bolt hole 7 and abut against the copper conductor, thereby realizing the connection between the copper core cable 3 and the conductor connecting tube 1.
[0034] Aluminum easily oxidizes in air, forming a layer of oxide that increases the contact resistance between aluminum and copper conductors when they are in direct contact. Increased contact resistance can lead to heat accumulation, which may cause excessive temperature rise at the joint and may even cause a fire. In addition, copper and aluminum are prone to electrochemical reactions in humid environments, causing corrosion and damage to the joints. This corrosion further increases contact resistance and deteriorates the quality of the connection. Copper and aluminum also have differences in elastic modulus and thermal expansion coefficient.
[0035] Based on this, in the present embodiment, by arranging a partition plate 5 in the conductor connecting tube 1, on the one hand, the partition plate 5 can prevent the aluminum core cable 2 and the copper core cable 3 from direct contact, thereby reducing potential safety hazards; on the other hand, in the process of inserting the aluminum core cable 2 and the copper core cable 3 into the first connecting cavity and the second connecting cavity respectively, the aluminum core cable 2 and the copper core cable 3 can be abutted against the partition plate 5, and the aluminum core cable 2 and the copper core cable 3 can be positioned with the aid of the partition plate 5, thereby ensuring that the aluminum core cable 2 and the copper core cable 3 are inserted into place in the conductor connecting tube 1, thereby ensuring the subsequent connection effect.
[0036] In actual use, the insulation layers on the aluminum core cable 2 and the copper core cable 3 can be stripped off respectively according to the lengths of the first connecting cavity and the second connecting cavity, and then the aluminum conductor of the aluminum core cable 2 is inserted into the first connecting cavity of the conductor connecting tube 1, and the aluminum conductor is abutted against the partition plate 5, and then the shear bolt 4 is installed in the first bolt hole 6, and the shear bolt 4 is abutted against the aluminum conductor, thereby realizing the connection between the aluminum core cable 2 and the conductor connecting tube 1, and then the copper conductor of the copper core cable 3 can be inserted into the second connecting cavity of the conductor connecting tube 1, and the copper conductor is abutted against the partition plate 5, and then the shear bolt 4 is installed in the second bolt hole 7, and the shear bolt 4 is abutted against the copper conductor, thereby realizing the connection between the copper core cable and the conductor connecting tube.
[0037] For example, before inserting the aluminum wire of the aluminum core cable 2 into the conductor connection tube 1 , conductive paste may be applied on the surface of the aluminum wire and the inner wall of the conductor connection tube 1 .
[0038] Therefore, with the high-voltage copper-aluminum cable transition joint in this embodiment, the aluminum core cable 2 and the copper core cable 3 can be fixed to the conductor connection tube 1 with the help of the shear bolt 4. During the connection process, only a torque wrench is needed for connection, and no heavy equipment such as hydraulic crimping or welding equipment is needed. The requirements for personnel are low, product failures due to poor construction can be avoided, and the connection quality can be guaranteed. Moreover, the aluminum core cable 2 and the copper core cable 3 are separated by the partition plate 5, which can avoid electrochemical corrosion of the copper-aluminum transition surface and reduce safety hazards.
[0039] Furthermore, in order to improve the protection effect, electric field control is achieved, such as Figure 1 As shown, the copper-aluminum cable transition joint also includes a rubber preformed body 8, which is sleeved on the outer circumference of the conductor connecting tube 1, and both ends of the rubber preformed body 8 can at least partially cover the aluminum core cable 2 and the copper core cable 3.
[0040] Exemplarily, the rubber preformed body 8 can be a tubular structure made of rubber material, and the inner diameter of the rubber preformed body 8 is adapted to the outer diameter of the conductor connecting tube 1. When the aluminum core cable 2 and the copper core cable 3 are connected via the conductor connecting tube 1, the rubber preformed body 8 can be tightly fitted on the outer periphery of the conductor connecting tube 1, and the two ends of the rubber preformed body 8 can simultaneously cover the aluminum core cable 2 and the copper core cable 3, so as to avoid exposure of the conductor connecting tube 1, the aluminum wire and the copper wire, thereby preventing leakage.
[0041] In addition, during the actual connection, a conductor connecting tube 1 having an outer diameter similar to that of the aluminum core cable 2 and the copper core cable 3 can be selected. Thus, after the rubber preformed body 8 is installed, there is no need to additionally fill the conductor connecting tube 1 and the rubber preformed body 8 with a semi-conductive tape or hardware for uniformly forming the electric field at the conductor connection.
[0042] In one embodiment, in order to prevent the shear bolts 4 from being concentrated on one side of the conductor connecting tube 1, causing the connected cable to be eccentric to the center of the conductor connecting tube, leaving an air gap between the rubber preformed body 8 and the conductor connecting tube 1, thereby causing product failure, the first bolt hole 6 and the second bolt hole 7 can be symmetrically arranged relative to the partition plate 5.
[0043] That is, the positions and numbers of the first bolt holes 6 and the second bolt holes 7 are symmetrical with respect to the partition plate 5. Therefore, after the shear bolts 4 are installed in the first bolt holes 6 and the second bolt holes 7, the center of gravity of the conductor connection tube 1 can be located at the center of the partition plate 5, thereby preventing an air gap from being generated between the rubber preformed body 8 and the conductor connection tube 1, thereby improving safety performance.
[0044] In one embodiment, in order to ensure that the aluminum core cable 2 and the copper core cable 3 can be stably installed in the conductor connection tube 1, as shown in FIG. Figure 2 As shown, the first bolt holes 6 are arranged at intervals along the circumferential direction of the conductor connecting tube 1 and along the length direction of the conductor connecting tube 1; the second bolt holes 7 are arranged at intervals along the circumferential direction of the conductor connecting tube 1 and along the length direction of the conductor connecting tube 1.
[0045] Specifically, in the length direction of the conductor connecting tube 1, the first bolt holes 6 are arranged in multiple circles, and the number of the first bolt holes 6 in each circle is multiple. At this time, when the aluminum core cable 2 is fixed with the help of the shear bolts 4, the shear bolts 4 can fix the aluminum core cable 2 at multiple positions in the length direction of the conductor connecting tube 1, and can also fix the aluminum core cable 2 at multiple positions in the circumferential direction of the conductor connecting tube 1.
[0046] Similarly, in the length direction of the conductor connecting tube 1, a plurality of second bolt holes 7 are arranged, and the number of the second bolt holes 7 in each circle is multiple. At this time, when the copper core cable 3 is fixed by means of the shear bolt 4, the shear bolt 4 can fix the copper core cable 3 at multiple positions in the length direction of the conductor connecting tube 1, and can also fix the copper core cable 3 at multiple positions in the circumferential direction of the conductor connecting tube 1.
[0047] In a specific embodiment, the number of turns of the first bolt hole 6 in the length direction of the conductor connection tube 1 is two to four, and the number of turns of the second bolt hole 7 in the length direction of the conductor connection tube 1 is two to four.
[0048] For example, in order to avoid eccentricity of the conductor connection tube 1, Figure 2 As shown, in the length direction of the conductor connection tube 1, the number of circles of the first bolt hole 6 and the second bolt hole 7 are both three.
[0049] In one embodiment, in the circumferential direction of the conductor connection tube 1 , the number of the first bolt holes 6 in each circle is three to six, and the number of the second bolt holes 7 in each circle is three to six.
[0050] For example, in order to avoid eccentricity of the conductor connection tube 1, Figure 2 As shown, in the length direction of the conductor connection tube 1, the number of the first bolt holes 6 in each circle and the number of the second bolt holes 7 in each circle are both four.
[0051] In one embodiment, the shear bolt 4 is made of brass, and its surface may be tin-plated, with a thickness of 10 to 15 mm. Optionally, the thread size of the shear bolt 4 may be selected to be M12 to M24.
[0052] During actual installation, the concave portions of the surfaces of the first bolt hole 6 and the second bolt hole 7 can be filled with epoxy repair agent and polished smooth with sandpaper. When the shear bolt 4 is installed in the first bolt hole 6 and the second bolt hole 7, the tightening torque can be 100-200 N·m.
[0053] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.
[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A copper-aluminum cable transition joint suitable for high voltage, characterized in that: include: Conductor connection tube, aluminum core cable, copper core cable and multiple shear bolts, among which, The conductor connecting tube has a tube cavity, a partition plate is provided in the middle of the tube cavity, and the partition plate divides the tube cavity into a first connecting cavity and a second connecting cavity. The tube wall of the conductor connecting tube is provided with a first bolt hole and a second bolt hole, the first bolt hole penetrates into the first connecting cavity, and the second bolt hole penetrates into the second connecting cavity. The aluminum core cable is inserted into the first connecting cavity, the copper core cable is inserted into the second connecting cavity, some of the shear bolts are threadedly connected to the first bolt holes and abut against the aluminum core cable, and some of the shear bolts are threadedly connected to the second bolt holes and abut against the copper core cable.
2. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: It also includes a rubber preformed body, which is sleeved on the outer circumference of the conductor connecting tube, and both ends of the rubber preformed body can at least partially cover the aluminum core cable and the copper core cable.
3. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: The first bolt hole and the second bolt hole are symmetrically arranged relative to the partition plate.
4. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: The first bolt holes are arranged at intervals along the circumferential direction of the conductor connection tube and at intervals along the longitudinal direction of the conductor connection tube; The second bolt holes are arranged at intervals along the circumferential direction of the conductor connection tube and are arranged at intervals along the longitudinal direction of the conductor connection tube.
5. The copper-aluminum cable transition joint suitable for high voltage according to claim 4 is characterized in that: The number of circles of the first bolt hole in the length direction of the conductor connection tube is two to four, and the number of circles of the second bolt hole in the length direction of the conductor connection tube is two to four.
6. The copper-aluminum cable transition joint suitable for high voltage according to claim 4 is characterized in that: In the circumferential direction of the conductor connection tube, the number of the first bolt holes in each circle is three to six, and the number of the second bolt holes in each circle is three to six.
7. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: The conductor connecting tube is made of aluminum alloy, and its surface is tin-plated, and the thickness of the tin-plating is 10 to 15 mm.
8. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: The thickness of the partition plate in the length direction of the conductor connection tube is 4 to 8 mm.
9. The copper-aluminum cable transition joint suitable for high voltage according to claim 1 is characterized in that: The shear bolt is made of brass and has a tin-plated surface with a thickness of 10 to 15 mm.