Load type drop-out fuse
Through spherical contact and modular design, the contact unreliable and complex assembly problems of load-type drop fuses are solved, and higher contact reliability and arc extinguishing effects are achieved, the assembly process is simplified, and the overall performance of the equipment is improved. Convenience.
Patent Information
- Application Number
- CN202323281600.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-01
AI Technical Summary
The existing load-type drop fuses have problems such as unreliable contact, complex structure, unreliable performance, unsatisfactory arc extinguishing effect, and inconvenient assembly.
The front end static contact plate and conductive cap are adopted with spherical contact method, combined with the combination of the arc extinguishing knife and the arc extinguishing chamber, adopts the front end contact assembly designed with a modular structure, and is connected through the clamped rear end contact assembly and mounting bracket. Enhance contact reliability and arc extinguishing effect and simplify assembly process.
Reliable contact with a larger contact area and smaller contact resistance is achieved, the arc extinguishing effect is enhanced, the assembly process is simplified, and the structural simplicity, performance stability and assembly convenience of the equipment are improved.
Smart Images
Figure CN222260952U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a drop-out fuse, in particular to a load-type drop-out fuse. Background Art
[0002] The drop-out fuse is the most commonly used short-circuit protection switch for 10kV distribution line branches and distribution transformers. The drop-out fuse is installed on the 10kV distribution line branch line to reduce the scope of power outages. Because it has an obvious disconnection point and has the function of an isolating switch, it creates a safe working environment for the maintenance section line and equipment. Installed on the distribution transformer, it can be used as the main protection of the distribution transformer. The drop-out fuse is widely used in the primary side of 10kV distribution lines and distribution transformers for protection and equipment switching operations, and has been popularized. The front-end moving contact and the front-end static contact of the existing load-type drop-out fuse are in contact with each other in a line contact manner, with a small contact area and a large contact resistance, resulting in the defect of unreliable contact between the front-end moving contact and the front-end static contact. In addition, the load-type drop-out fuse also has the defects of complex structure, unreliable performance, unsatisfactory arc extinguishing effect, and inconvenient assembly. Summary of the invention
[0003] The utility model aims to overcome the defects of the prior art and provide a load-type drop-out fuse with simple structure, stable and reliable performance, good arc extinguishing effect and convenient assembly.
[0004] To achieve the above-mentioned purpose, the utility model adopts a load-type drop-out fuse, including an insulator, a front end conductive plate arranged on one end of the insulator, a rear end conductive plate arranged on the other end of the insulator, a fuse tube, a front end contact assembly arranged between one end of the fuse tube and the front end conductive plate, and a rear end contact assembly arranged between the other end of the fuse tube and the rear end conductive plate. The front end contact assembly includes a conductive plate arranged on the front end conductive plate, a front end static contact piece arranged on the front end conductive plate, an arc extinguishing cover arranged on one side of the front end conductive plate, and an arc extinguishing knife arranged on one side of the fuse tube and matched with the arc extinguishing cover. A conductive cap matched with the front end static contact piece is arranged on one end of the fuse, and a spherical protruding contact portion in contact with the front end static contact piece is provided on the conductive cap. A spherical contact groove fitted on the spherical contact portion is provided on one side of the contact portion of the front end static contact piece. A compression spring is provided between the other side of the contact portion of the front end static contact and the front end conductive plate.
[0005] The beneficial effects of the above structure are: the front static contact piece and the conductive cap of the fuse tube are in contact in a spherical contact manner, the contact area is larger, and the contact resistance is smaller. The compression spring can increase the contact pressure between the front static contact piece and the conductive cap, thereby ensuring that the front static contact piece and the conductive cap of the fuse tube are in more reliable contact. The arc extinguishing knife cooperates with the arc extinguishing chamber to enhance the arc extinguishing effect of the load-type drop-out fuse, and the front contact assembly adopts a modular structure design, thereby realizing the modular assembly of the front contact assembly and the insulator, and the assembly efficiency is higher. Therefore, the load-type drop-out fuse has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, and convenient assembly.
[0006] In particular, a positioning column is provided on one side of the fuse tube, the arc extinguishing knife is linked to the positioning column, a torsion spring is provided on the positioning column, one end of the torsion spring is engaged in the positioning hole of the fuse tube, and the other end of the torsion spring is against the arc extinguishing knife. A torsion spring is provided between the arc extinguishing knife and the fuse tube, and the torsion spring can increase the elastic contact force of the arc extinguishing knife, thereby ensuring reliable contact between the arc extinguishing knife and the arc extinguishing chamber.
[0007] In particular, one end of the front static contact piece has a bending guide portion that matches the conductive cap, and the bending guide portion is respectively provided with two guiding convex ribs that match the conductive cap, and the conductive cap moves with the fuse tube and slides along the bending guide portion into the spherical contact groove. The bending guide portion of the front static contact piece can guide the conductive cap, which can ensure that the conductive cap and the front static contact piece are accurately closed, which is conducive to improving the working reliability of the load-type drop-out fuse.
[0008] In particular, the rear-end contact assembly includes a conductive seat arranged on the rear-end conductive plate, a conductive sleeve arranged on the other end of the fuse tube, and a rear-end conductive member rotatably arranged on the conductive sleeve. Two contact hooks are symmetrically arranged on the conductive seat, and two contact shafts matching with the two contact hooks are provided at both ends of the rear-end conductive member. The two contact shafts are engaged in the two contact hooks and constitute a snap-fitting fit between the conductive seat and the rear-end conductive member. The conductive seat and the rear-end conductive member are assembled in a snap-fitting manner, thereby facilitating the assembly of the conductive seat and the rear-end conductive member and ensuring a more reliable connection between the conductive seat and the rear-end conductive member.
[0009] In particular, a mounting bracket is provided on the middle of the insulator, and waist-shaped mounting holes and circular mounting holes are provided on the mounting bracket, so as to facilitate the on-site installation and debugging of the load-type drop-out fuse. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a stereogram of an embodiment of the utility model.
[0011] Figure 2This is an exploded view of an embodiment of the utility model.
[0012] Figure 3 It is a three-dimensional diagram of the front static contact piece of the embodiment of the utility model. DETAILED DESCRIPTION
[0013] like Figures 1 to 3 As shown, the embodiment of the utility model is a load-type drop-out fuse, comprising an insulator 10, a front end conductive plate 11 arranged on one end of the insulator 10, a rear end conductive plate 12 arranged on the other end of the insulator 10, a fuse tube 13, a front end contact assembly 20 arranged between one end of the fuse tube 13 and the front end conductive plate 11, and a rear end contact assembly 30 arranged between the other end of the fuse tube 13 and the rear end conductive plate 12. The front end contact assembly 20 comprises a conductive plate 21 arranged on the front end conductive plate 11, a front end static contact piece 22 arranged on the front end conductive plate 21, and a front end contact assembly 30 arranged between the front end conductive plate 12 and the rear end conductive plate 13. The arc extinguishing cover 23 on one side of the end conductive plate 21, the arc extinguishing knife 24 arranged on one side of the fuse tube 13 and matched with the arc extinguishing cover 23, the conductive cap 14 matched with the front static contact piece 22 is arranged on one end of the fuse 13, the conductive cap 14 has a spherical convex contact part 141 in contact with the front static contact piece 22, the contact part 221 of the front static contact piece 22 is provided with a spherical contact groove 222 fitted on the spherical convex contact part 132 on one side, and a compression spring 25 is arranged between the contact part 221 of the front static contact 22 and the front conductive plate 21 on the other side. A positioning column 15 is arranged on one side of the fuse tube 13, the arc extinguishing knife 24 is linked to the positioning column 15, and a torsion spring 16 is arranged on the positioning column 15, one end of the torsion spring 16 is engaged in the positioning hole 131 of the fuse tube 13, and the other end of the torsion spring 16 is against the arc extinguishing knife 24. A torsion spring is arranged between the arc extinguishing knife and the fuse tube, and the torsion spring can increase the elastic contact force of the arc extinguishing knife, thereby ensuring reliable contact between the arc extinguishing knife and the arc extinguishing chamber. The front static contact piece 22 has a bending guide part 223 matched with the conductive cap 14 on one end, and the bending guide part 223 is respectively provided with two guide ribs 2231 matched with the conductive cap 14. The conductive cap 14 moves with the fuse tube 13 and slides into the spherical contact groove 222 along the bending guide part 223. The bending guide part of the front static contact piece can guide the conductive cap, which can ensure the accurate closing of the conductive cap and the front static contact piece, which is conducive to improving the working reliability of the load-type drop-out fuse. The middle part of the insulator 10 is provided with a mounting bracket 17, and the mounting bracket 17 is respectively provided with a waist-shaped mounting hole 171 and a circular mounting hole 172. The mounting bracket is respectively provided with a waist-shaped mounting hole and a circular mounting hole, so as to facilitate the on-site installation and debugging of the load-type drop-out fuse.
[0014] like Figures 1-2As shown, the rear end contact assembly 30 includes a conductive seat 31 disposed on the rear end conductive plate 12, a conductive sleeve 32 disposed on the other end of the fuse tube 13, and a rear end conductive member 33 rotatably disposed on the conductive sleeve 32. Two contact hooks 311 are symmetrically disposed on the conductive seat 31, and two ends of the rear end conductive member 33 have two contact shafts 331 matched with the two contact hooks 311. The two contact shafts 331 are engaged in the two contact hooks 311, and constitute a snap fit between the conductive seat 31 and the rear end conductive member 33. The conductive seat and the rear end conductive member are assembled in a snap fit manner, thereby facilitating the assembly of the conductive seat and the rear end conductive member, and ensuring a more reliable connection between the conductive seat and the rear end conductive member.
[0015] The front static contact piece and the conductive cap of the fuse tube are in contact with each other in a spherical contact manner, which has a larger contact area and a smaller contact resistance. The compression spring can increase the contact pressure between the front static contact piece and the conductive cap, thereby ensuring that the front static contact piece and the conductive cap of the fuse tube are in contact more reliably. The arc extinguishing knife cooperates with the arc extinguishing chamber to enhance the arc extinguishing effect of the load-type drop-out fuse, and the front contact assembly adopts a modular structure design, thereby realizing the modular assembly of the front contact assembly and the insulator, and the assembly efficiency is higher. Therefore, the load-type drop-out fuse has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, and convenient assembly.
Claims
1. A load-type drop-out fuse, characterized in that: The invention comprises an insulator, a front end conductive plate arranged on one end of the insulator, a rear end conductive plate arranged on the other end of the insulator, a fuse tube, a front end contact assembly arranged between one end of the fuse tube and the front end conductive plate, and a rear end contact assembly arranged between the other end of the fuse tube and the rear end conductive plate. The front end contact assembly comprises a conductive plate arranged on the front end conductive plate, a front end static contact piece arranged on the front end conductive plate, an arc extinguishing cover arranged on one side of the front end conductive plate, and an arc extinguishing knife arranged on one side of the fuse tube and matched with the arc extinguishing cover. A conductive cap matched with the front end static contact piece is arranged on one end of the fuse, a spherical raised contact portion contacting with the front end static contact piece is provided on the conductive cap, a spherical contact groove fitted on the spherical raised contact portion is provided on one side of the contact portion of the front end static contact piece, and a compression spring is provided between the other side of the contact portion of the front end static contact piece and the front end conductive plate.
2. The load-type drop-out fuse according to claim 1, characterized in that: A positioning column is arranged on one side of the fuse tube, the arc extinguishing knife is linked to the positioning column, a torsion spring is arranged on the positioning column, one end of the torsion spring is engaged in the positioning hole of the fuse tube, and the other end of the torsion spring contacts the arc extinguishing knife.
3. The load-type drop-out fuse according to claim 1 or 2, characterized in that: The front static contact piece has a bending guide portion on one end thereof which matches the conductive cap. The bending guide portion is provided with two guiding ribs which match the conductive cap. The conductive cap moves with the fuse tube and slides along the bending guide portion into the spherical contact groove.
4. The load-type drop-out fuse according to claim 1 or 2, characterized in that: The rear end contact assembly includes a conductive seat arranged on the rear end conductive plate, a conductive sleeve arranged on the other end of the fuse tube, and a rear end conductive member rotatably arranged on the conductive sleeve. Two contact hooks are symmetrically arranged on the conductive seat, and two ends of the rear end conductive member have two contact shafts that cooperate with the two contact hooks. The two contact shafts are engaged in the two contact hooks and constitute a snap-fit between the conductive seat and the rear end conductive member.
5. The load-type drop-out fuse according to claim 1 or 2, characterized in that: A mounting bracket is arranged on the middle part of the insulator, and a waist-shaped mounting hole and a circular mounting hole are respectively arranged on the mounting bracket.