CN220628255U - Large-section screwing-off type bolt aluminum conductor connecting fitting - Google Patents
Large-section screwing-off type bolt aluminum conductor connecting fitting Download PDFInfo
- Publication number
- CN220628255U CN220628255U CN202322153721.3U CN202322153721U CN220628255U CN 220628255 U CN220628255 U CN 220628255U CN 202322153721 U CN202322153721 U CN 202322153721U CN 220628255 U CN220628255 U CN 220628255U
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- Prior art keywords
- conductor
- connecting pipe
- bolt
- type bolt
- aluminum conductor
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- 239000004020 conductor Substances 0.000 title claims abstract description 49
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 4
- 238000011900 installation process Methods 0.000 abstract description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 7
- 230000002572 peristaltic effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Cable Accessories (AREA)
Abstract
The utility model discloses a large-section screwing-off type bolt aluminum conductor connecting fitting which comprises a connecting pipe for connecting a cable conductor, wherein a plurality of groups of screw holes which are spirally distributed are formed in the side wall of the connecting pipe, and bolts which are broken by more than a preset stress moment are arranged in the screw holes. The utility model adopts a mechanical connection mode, the connecting pipe is made of special aluminum alloy material, has good creep resistance, mechanical strength, good overcurrent and short-time current impact resistance, and is mechanically connected through bolts. The bolt applies strong pressure on the conductor part, so that the compression of the conductor can be realized, the creep deformation of the conductor due to large-area stress can be prevented, and the creep property of the aluminum core conductor is inhibited to the maximum extent. The construction of the mechanical connection mode adopts a torque wrench to ensure the quality of the joint, and when the bolt bears a certain torque, the nut naturally falls off. The installation process on site is greatly simplified.
Description
Technical Field
The utility model relates to the technical field of conductor connecting equipment, in particular to a large-section screwing-off type bolt aluminum conductor connecting fitting.
Background
The aluminum resources in China are relatively rich, and the production technology of aluminum rods reaches the electrical grade level.
For small section aluminum conductor connections, a "crimp" approach is typically used. However, for large-section aluminum conductors, due to the creep property of aluminum, the crimping mode can cause gaps to be generated at contact points to influence contact after multiple cold and hot cycles (power on and power off) are performed in operation, so that the operation temperature is increased, corrosion oxidation is increased at high temperature, the connection quality is deteriorated after vicious cycle, and finally accidents such as overhigh temperature, smoke emission, burning and the like of the contact points are caused.
For the connection of large-section aluminum conductors, international companies adopt a welding mode, high temperature generated during welding is easy to damage cable insulation, corresponding cooling protection measures are complex, smoke generated during welding is harmful to human bodies, X-ray machine flaw detection is needed after welding is finished, welding quality of joints is directly affected by welding level difference of staff, and uncertainty of joint installation quality is increased. Meanwhile, the welding process has long construction time and long power failure time of the client, so that the client evaluation is low.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, one purpose of the utility model is to provide a large-section screwing-off type bolt aluminum conductor connecting fitting, when the bolt is subjected to a certain moment, the nut naturally drops off, and the field installation process is greatly simplified.
The large-section screwing-off type bolt aluminum conductor connecting fitting comprises a connecting pipe for connecting a cable conductor, a plurality of groups of screw holes distributed in a spiral mode are formed in the side wall of the connecting pipe, and bolts which are broken by more than a preset stress moment are installed in the screw holes.
Preferably, the bolt comprises a threaded part, a threaded head and a connecting part with a truncated cone-shaped structure, wherein an external thread matched with the threaded hole is arranged on the outer side of the threaded part, the threaded head is connected with the threaded part through the connecting part, one side with a small diameter of the connecting part is connected with the threaded part, and one side with a large diameter of the connecting part is connected with the threaded head.
Preferably, the inner wall of the connecting pipe is provided with threads.
Preferably, the inner diameter of the connecting tube is equal to the diameter of the cable conductor.
Preferably, the connecting pipe and the bolt are made of A2024 aluminum alloy.
Preferably, the rotation angle of the beginning end and the end of each set of screw holes distributed in a spiral shape is 180 degrees.
The beneficial effects of the utility model are as follows:
(1) The connecting pipe is a hollow cylinder, a cavity for placing a cable conductor is formed in the connecting pipe, and internal threads are formed in the connecting pipe;
(2) Screw holes are spirally distributed on the pipe wall of the connecting pipe, the screw holes are communicated with the outer side of the cylinder and the cavity, screw threads are arranged in the screw holes, a screwing-off type bolt is arranged in the screw holes in a matched manner, the bolt is matched with the screw threads, and strong pressure is applied to part of a conductor by the bolt, so that the compression of the conductor can be realized, the peristaltic deformation of the conductor due to large-area stress can be prevented, the peristaltic property of an aluminum core conductor is inhibited to the maximum extent, two ends of the conductor connecting pipe are connected with conductors of two sections of cables, and the conductor connecting pipe can be tightly fixed on the surface of the conductor when the bolt is screwed down, so that the conductor connecting pipe has good mechanical strength with tensile strength exceeding 100 kN;
(3) When the bolt is under a certain moment, the nut naturally falls off, so that the field installation process is greatly simplified.
Drawings
In the drawings:
fig. 1 is a schematic structural diagram of a large-section screw-off type bolt aluminum conductor connecting fitting provided by the utility model;
fig. 2 is a cross-sectional view of a large-section screw-off type bolt aluminum conductor connecting fitting provided by the utility model;
fig. 3 is a side view of the large-section screw-off type bolt aluminum conductor connecting fitting provided by the utility model.
In the figure: 1-connecting pipe, 2-bolt, 3-screw, 21-screw, 22-screw head, 23-connecting part.
Detailed Description
Referring to fig. 1-3, a large-section screwing-off type bolt aluminum conductor connecting fitting comprises a connecting pipe 1 for connecting a cable conductor, wherein a plurality of groups of screw holes 3 distributed in a spiral manner are formed in the side wall of the connecting pipe 1, and bolts 2 broken by more than a preset stress moment are installed in the screw holes 3; the bolt 2 comprises a threaded part 21, a threaded head 22 and a connecting part 23 with a truncated cone-shaped structure, an external thread matched with the screw hole 3 is arranged on the outer side of the threaded part 21, the threaded head 22 is connected with the threaded part 21 through the connecting part 23, one side with a small diameter of the connecting part 23 is connected with the threaded part 21, and one side with a large diameter of the connecting part 23 is connected with the threaded head 22; the inner wall of the connecting pipe 1 is provided with threads; the inner diameter of the connecting pipe 1 is equal to the diameter of the cable conductor; the connecting pipe 1 and the bolt 2 are made of A2024 aluminum alloy; the rotation angle of the starting end and the tail end of each group of screw holes 3 which are distributed in a spiral shape is 180 degrees.
Working principle: the connecting pipe 1 is a hollow cylinder (the inner wall is provided with threads with the thread pitch of 2mm, so that the contact area between a cable conductor and the connecting pipe is increased, the current is better transmitted, meanwhile, the friction force between the connecting pipe and the conductor is increased, the mechanical strength is improved), a cavity for placing the cable conductor is formed in the connecting pipe, screw holes 3 which are spirally distributed are formed in the pipe wall of the connecting pipe 1, the screw holes 3 are communicated with the outer side of the cylinder and the cavity, threads are formed in the screw holes 3, a screwing-off bolt 2 is installed in the screw holes in a matched mode, and the bolt 2 is matched with the threads 3. When the bolt is screwed, the bolt is broken when the thin section exceeds a specific torsion, and the bolt 2 can be tightly fixed on the surface of the conductor, so that the bolt has good mechanical strength.
Before the connecting pipe 1 is installed, firstly, the surface of the conductor is polished by a steel wire brush, an oxide layer on the surface of the aluminum conductor is removed, then conductive paste is coated, and gaps of the contact surface are filled, so that the whole contact spots are changed into pure metal contact surfaces, the contact area can be increased, various impurities, corrosive gases, water and the like can be prevented from invading into the contact area again, the contact resistance and the temperature rise can be reduced, the conductive performance of a wire and a connecting fitting is improved, and the safe long-term operation of a cable accessory is ensured.
Table-screw-off type aluminum conductor connecting pipe test result comparison table
The screw holes are spirally distributed, so that more bolts can be distributed in a limited space, the interference of each bolt in space is reduced, and the screw holes have better tensile strength.
Claims (6)
1. A large-section twisting-off type bolt aluminum conductor connecting fitting is characterized in that: the cable conductor connecting device comprises a connecting pipe for connecting cable conductors, a plurality of groups of screw holes which are distributed in a spiral mode are formed in the side wall of the connecting pipe, and bolts which are broken by being larger than a preset stress moment are arranged in the screw holes.
2. The large-section twisting-off type bolt aluminum conductor connecting fitting according to claim 1, wherein: the bolt comprises a threaded part, a threaded head and a connecting part with a truncated cone-shaped structure, wherein external threads matched with the threaded holes are formed in the outer side of the threaded part, the threaded head is connected with the threaded part through the connecting part, one side with the small diameter of the connecting part is connected with the threaded part, and one side with the large diameter of the connecting part is connected with the threaded head.
3. The large-section twisting-off type bolt aluminum conductor connecting fitting according to claim 1, wherein: the inner wall of the connecting pipe is provided with threads.
4. The large-section twisting-off type bolt aluminum conductor connecting fitting according to claim 1, wherein: the inner diameter of the connecting tube is equal to the diameter of the cable conductor.
5. The large-section twisting-off type bolt aluminum conductor connecting fitting according to claim 1, wherein: the connecting pipe and the bolt are made of A2024 aluminum alloy.
6. The large-section twisting-off type bolt aluminum conductor connecting fitting according to claim 1, wherein: the rotation angle of the starting end and the tail end of each screw hole which are spirally distributed is 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322153721.3U CN220628255U (en) | 2023-08-11 | 2023-08-11 | Large-section screwing-off type bolt aluminum conductor connecting fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322153721.3U CN220628255U (en) | 2023-08-11 | 2023-08-11 | Large-section screwing-off type bolt aluminum conductor connecting fitting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628255U true CN220628255U (en) | 2024-03-19 |
Family
ID=90228224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322153721.3U Active CN220628255U (en) | 2023-08-11 | 2023-08-11 | Large-section screwing-off type bolt aluminum conductor connecting fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628255U (en) |
-
2023
- 2023-08-11 CN CN202322153721.3U patent/CN220628255U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |