Drop-out fuse moving contact capable of resisting sand and dust
By adding a shovel block to the touches of the falling fuse to remove the accumulation of dust between the tentacles and the static touches, it solves the problem of poor contact caused by dust in the sand and dust. Working life.
Patent Information
- Application Number
- CN202411559347.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-01-24
AI Technical Summary
In sand and dusty weather, the moving and static contacts of the drop fuse are prone to accumulate dust, resulting in poor contact, arc ablation, causing oxidation and rust at the contact area, increasing the contact resistance, and reducing the conductivity of the fuse. This causes the fuse fuse to burn.
Add the first shovel and the second dust block to the dynamic contacts of the falling fuse to ensure that these dust blocks remove the accumulation of dust between the moving contact and the static touches during the melt. The fuse caused by stuck or the melting tube cannot fall in time.
It effectively prevents poor contact between the moving contacts and the static contacts caused by dust accumulation, and improves the reliability and working life of the drop-out fuse in sandy and dusty weather.
Smart Images
Figure CN119361395A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of power systems, and in particular to a moving contact of a drop-out fuse capable of resisting sand and dust. Background Art
[0002] The safe operation of the power system is inseparable from overload protection equipment, among which drop-out fuses play a vital role. The core advantage of this device is that it can quickly cut off the circuit when the current exceeds the preset value, effectively ensuring the safety of equipment and lines. At the same time, because it has an obvious disconnection point, it can create a safe working environment for the maintenance section lines and equipment. Therefore, the reliability of drop-out fuses is of great significance to the transmission safety of the power system.
[0003] In my country's power transmission lines, especially in the sandstorm weather climate in the northwest region, the current structure of the drop-out fuse will collect a lot of dust on the conductive duck tongue of the moving contact and the static contact after long-term use. After the fuse implements the fusing function, when the fuse tube is re-pulled after maintenance, the dust will be rubbed onto the conductive cap of the moving contact pair, resulting in poor contact between the moving contact pair and the conductive duck tongue of the static contact, causing arc erosion of the contact part, resulting in gradual oxidation and rust of the contact part, increasing the contact resistance, reducing the conductive performance of the fuse, and then causing the fuse to burn out. Therefore, it is necessary to design a dust-proof drop-out fuse moving contact to prevent the fuse from burning out due to poor contact between the moving and static contacts caused by dust collection. Summary of the invention
[0004] The present invention provides a sand and dust resistant drop-out fuse moving contact, which overcomes the above-mentioned shortcomings of the prior art.
[0005] In order to solve the problem of fuse wire burning caused by poor contact between moving and static contacts due to dust accumulation, the present invention discloses a moving contact of a drop-type fuse that can resist sandstorms. Its structure is as follows: a first dust shoveling block and a second dust shoveling block are added in the falling direction and the resetting direction of the moving contact of the drop-type fuse. When the fuse tube moves, the accumulated dust between the moving contact and the static contact is removed to prevent the fuse wire from burning or the fuse tube from failing to fall in time due to poor contact or jamming between the moving contact and the static contact caused by dust accumulation.
[0006] After the moving contact is tightened to the melting tube, the first dust scraping block and the second dust scraping block are exactly located in the falling direction and the resetting direction. If there is an error in the direction of the first dust scraping block and the second dust scraping block, use copper washers of different thicknesses between the melting tube and the moving contact to adjust the orientation of the first dust scraping block and the second dust scraping block.
[0007] The first dust shovel block and the second dust shovel block are in the shape of an arc, the chord length of the arc is the diameter of the starting circle of the arc-shaped contact surface at the top of the moving contact, the inner diameter of the dust shovel block and the top is Dtn_13, the outer diameter of the top is Dtw_14, the inner diameter of the bottom is Dbn_15, the outer diameter of the bottom is Dbw_16, and the inner bottom has an arc angle of α.
[0008] The top outer edge height of the first dust scooping block and the arc-shaped contact surface at the top of the moving contact are on the same arc surface, and the top inner edge height of the first dust scooping block is lower than the top outer edge height by (Dtw_14-Dtn_13) / 2.0.
[0009] The top inner edge height of the second dust shoveling block and the arc-shaped contact surface at the top of the moving contact are on the same arc surface, and the top outer edge height of the second dust shoveling block is lower than the top inner edge height by (Dbw_16-Dbn_15) / 2.0.
[0010] The characteristic dimensions of the first dust shovel block, Dtw, Dbn, Dbw, etc. of the second dust shovel block are determined as follows: Dtn=Dtw-3mm, Dtw=1.1-1.2 times the diameter of the top cylinder of the moving contact, Dbn=the diameter of the top cylinder of the moving contact, Dbw=0.90-0.95 times the diameter of the skirt of the moving contact.
[0011] The first dust shoveling block and the second dust shoveling block are made of the same material as the moving contact, and the first dust shoveling block and the second dust shoveling block are machined simultaneously with the moving contact.
[0012] The beneficial effects of the present invention are as follows: it can effectively solve the problem of poor contact between the moving contact and the static contact of the existing fuse caused by the accumulation of sand and dust, which generates arc erosion of the contact parts, causes the contact parts to gradually oxidize and corrode, increases the contact resistance, reduces the conductivity of the fuse, and then causes the fuse wire to burn out, which is a fatal defect. The reliability and service life of the drop-out fuse in dusty weather are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings: Figure 1 The overall structure diagram of the drop-out fuse equipped with a moving contact to protect against sand and dust; Figure 2 To resist sand and dust, the moving contact structure diagram; Figure 3 This is a top view of the structure of the moving contact; Figure 4 This is a cross-sectional view of the moving contact. DETAILED DESCRIPTION
[0014] An embodiment of the present invention relates to a moving contact of a drop-out type fuse that can resist sand and dust. After manufacturing a moving contact 1 according to the moving contact structure described in the present invention, the moving contact 1 and the fuse tube 4 are connected by threads, thereby completing the final installation structure of the moving contact of the drop-out type fuse that can resist sand and dust weather described in the present invention.
[0015] The following is the specific structure: A moving contact of a drop-type fuse that resists sand and dust is provided. A first dust shoveling block 2 and a second dust shoveling block 3 are added to the moving contact 1 of the drop-type fuse in the falling direction and the resetting direction. The first dust shoveling block 2 and the second dust shoveling block 3 remove the dust 6 between the moving contact 1 and the static contact 5 when the fuse tube 4 moves.
[0016] After the moving contact 1 is tightened to the melting tube 4, the first dust scooping block 2 and the second dust scooping block 3 are exactly located in the falling direction and the resetting direction. If there is an error in the direction of the first dust scooping block 2 and the second dust scooping block 3, copper pads 8 of varying thicknesses are used between the melting tube 4 and the moving contact 1 to adjust the orientation of the first dust scooping block 2 and the second dust scooping block 3.
[0017] The first dust shovel block 2 and the second dust shovel block 3 are in the shape of an arc, the chord length 9 of the arc is the diameter 12 of the starting circle 11 of the arc-shaped contact surface 10 at the top of the moving contact 1, the top inner diameter 13 of the first dust shovel block 2 and the second dust shovel block 3 is Dtn_13, the top outer diameter 14 is Dtw_14, the bottom inner diameter 15 is Dbn_15, the bottom outer diameter 16 is Dbw_16, and the inner bottom has an arc angle 17, the angle is α.
[0018] The top outer edge height 18 of the first dust scooping block 2 and the top arc-shaped contact surface 10 of the moving contact 1 are on the same arc surface, and the top inner edge height 19 of the first dust scooping block 2 is lower than the top outer edge height 18 by (Dtw_14-Dtn_13) / 2.0.
[0019] The top inner edge height 20 of the second dust scooping block 3 and the top arc-shaped contact surface 10 of the moving contact 1 are on the same arc surface, and the top outer edge height 21 of the second dust scooping block 3 is lower than the top inner edge height 20 by (Dbw_16-Dbn_15) / 2.0.
[0020] Dtn=Dtw-3mm, Dtw=1.1-1.2 times the top cylindrical diameter of the moving contact 1, Dbn=top cylindrical diameter of the moving contact 1, Dbw=0.90-0.95 times the skirt diameter of the moving contact 1.
[0021] The materials of the first dust scooping block 2 and the second dust scooping block 3 are the same as those of the moving contact 1 , and the first dust scooping block 2 and the second dust scooping block 3 are machined simultaneously with the moving contact 1 .
[0022] The fuse tube 4 moves, and the first dust shovel block 2 and the second dust shovel block 3 can remove the accumulated dust 6 between the moving contact 1 and the stationary contact 5 in time with the movement, so as to avoid the accumulated dust causing poor contact or jamming of the moving contact and the stationary contact, thereby causing the fuse to burn out or the fuse tube to fail to fall in time. The mechanical structure does not require additional power and has high reliability.
Claims
1. A moving contact of a drop-out fuse capable of resisting sand and dust, characterized in that: A first dust scraping block (2) and a second dust scraping block (3) are added in the falling direction and the resetting direction of the moving contact (1) of the drop-type fuse. The first dust scraping block (2) and the second dust scraping block (3) remove dust (6) accumulated between the moving contact (1) and the stationary contact (5) when the fuse tube (4) moves.
2. The movable contact of a drop-out fuse that resists sand and dust according to claim 1, characterized in that: After the moving contact (1) is tightened to the melting tube (4), the first dust scraping block (2) and the second dust scraping block (3) are exactly located in the falling direction and the resetting direction. If there is an error in the direction of the first dust scraping block (2) and the second dust scraping block (3), copper pads (8) of different thicknesses are used to pad between the melting tube (4) and the moving contact (1) to adjust the orientation of the first dust scraping block (2) and the second dust scraping block (3).
3. The movable contact of a drop-out fuse that resists sand and dust according to claim 1, characterized in that: The first dust scraping block (2) and the second dust scraping block (3) are in the shape of an arc, the chord length (9) of the arc is the diameter (12) of the starting circle (11) of the arc-shaped contact surface (10) at the top of the moving contact (1), the inner diameter (13) of the top of the first dust scraping block (2) and the second dust scraping block (3) is Dtn_13, the outer diameter (14) of the top is Dtw_14, the inner diameter (15) of the bottom is Dbn_15, the outer diameter (16) of the bottom is Dbw_16, and the inner bottom has an arc angle (17) of angle α.
4. The movable contact of a drop-out fuse capable of resisting sand and dust according to claim 2, characterized in that: The top outer edge height (18) of the first dust scraping block (2) and the top arc-shaped contact surface (10) of the moving contact (1) are on the same arc surface, and the top inner edge height (19) of the first dust scraping block (2) is lower than the top outer edge height (18) by (Dtw_14-Dtn_13) / 2.
0.
5. The movable contact of a drop-out fuse capable of resisting sand and dust according to claim 2, characterized in that: The top inner edge height (20) of the second dust scraping block (3) and the top arc-shaped contact surface (10) of the moving contact (1) are on the same arc surface, and the top outer edge height (21) of the second dust scraping block (3) is lower than the top inner edge height (20) by (Dbw_16-Dbn_15) / 2.
0.
6. The movable contact of a drop-out fuse capable of resisting sand and dust according to claim 3, characterized in that: Dtn=Dtw-3mm, Dtw=1.1-1.2 times the top cylinder diameter of the moving contact (1), Dbn=the top cylinder diameter of the moving contact (1), Dbw=0.90-0.95 times the skirt diameter of the moving contact (1).
7. The movable contact of a drop-out fuse capable of resisting sand and dust according to claim 2, characterized in that: The material of the first dust scooping block (2) and the second dust scooping block (3) is the same as that of the moving contact (1); the first dust scooping block (2) and the second dust scooping block (3) are machined simultaneously with the moving contact (1).