CN113130274A - Drop-out fuse - Google Patents
Drop-out fuse Download PDFInfo
- Publication number
- CN113130274A CN113130274A CN202110281242.2A CN202110281242A CN113130274A CN 113130274 A CN113130274 A CN 113130274A CN 202110281242 A CN202110281242 A CN 202110281242A CN 113130274 A CN113130274 A CN 113130274A
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- Prior art keywords
- tube
- base
- conductive
- fuse
- conductive cap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
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Abstract
The invention discloses a drop-out fuse, which comprises a base, a high-voltage fuse tube and a contact, wherein a support is arranged on one side of the base, a hanging pin is arranged on the support, the base, the support and the hanging pin are all conductors, an indicating device for indicating the normal and disconnected states of a fuse wire in the high-voltage fuse tube is arranged in the base, and an observation window is arranged on the side wall of the base; the high-voltage fusion tube comprises a high-voltage insulating tube, a partition plate, quartz sand, a conductive rod, an upper conductive cap, a lower conductive cap, a second pressure spring, a firing pin and a fuse wire; the contact comprises a conductive tube, an upper moving contact and an operating ring, wherein the upper moving contact is arranged at the upper end of the conductive tube, and the operating ring is arranged on one side of the conductive tube; a through hole for the striker to pass through is arranged between the top wall in the base and the upper end of the base, the lower end of the high-pressure fusion tube is connected with the upper end of the base through a lower conductive cap, and the upper end of the high-pressure fusion tube is connected with the lower end of the conductive tube through an upper conductive cap. The invention solves the problems that the existing drop-out switch fuse wire is easy to be affected with damp, oxidized and corroded, is inconvenient to overhaul or causes fire, short circuit and the like.
Description
Technical Field
The invention relates to a drop-out fuse, belonging to the technical field of distribution short-circuit protection switches.
Background
The drop-out switch is the most commonly used short-circuit protection switch for the distribution lines and the distribution transformers, has the advantages of economy and convenient operation, and is widely applied to the high-voltage sides of the distribution lines and the distribution transformers. However, the existing drop-out switch has the disadvantages that the fuse wire tube of the existing drop-out switch is not closed, the fuse wire is exposed outdoors all the year round, and after outdoor moisture, rainwater, dust and the like enter the fuse wire tube, the fuse wire is affected with damp and oxidized to corrode, a contact point is oxidized to corrode, the resistance of the fuse wire is increased, the strength is reduced, and the fuse wire is abnormally fused or broken; in addition, after the fuse wire is blown, if the fuse wire does not fall from the fuse wire tube, the fuse wire is not convenient to check whether the fuse wire is blown or not, the fault processing time of a maintainer is prolonged, if the fuse wire falls from the fuse wire tube, the high-temperature fuse wire can ignite weeds on the ground to cause a fire disaster, and when strong wind exists, the falling long fuse wire can be blown to other drop-out switches or circuits by the wind to cause a short circuit and cause tripping.
Disclosure of Invention
The invention provides a drop-out fuse for solving the problems that the existing drop-out switch fuse is easy to be affected with damp, oxidized and corroded, inconvenient to maintain or cause fire, short circuit and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a drop-out fuse comprises a base, a high-voltage fuse tube and a contact, wherein a support is arranged on one side of the base, a hanging pin is arranged on the support, the base, the support and the hanging pin are all conductors, an indicating device used for indicating the normal and disconnected states of a fuse wire in the high-voltage fuse tube is arranged in the base, correspondingly, an observation window is arranged on the side wall of the base, the indicating device comprises an indicating piece and a first pressure spring, the indicating piece is arranged on the first pressure spring, the upper end of the indicating piece is contacted with a top wall in the base under the jacking action of the first pressure spring, and an indicating mark is arranged on one side, facing the observation window, of the indicating piece; the high-voltage fuse tube comprises a high-voltage insulating tube, a partition plate, quartz sand, a conductive rod, an upper conductive cap, a lower conductive cap, a second pressure spring, a firing pin and a fuse wire, wherein the partition plate is arranged at the lower part in the high-voltage insulating tube, the quartz sand is filled in the high-voltage insulating tube from the upper end to the space between the partition plate, the lower end of the conductive rod is inserted into the quartz sand from the upper end of the high-voltage insulating tube, the upper conductive cap is packaged at the upper end of the high-voltage insulating tube and covers the conductive rod inside, the lower conductive cap is arranged at the lower end of the high-voltage insulating tube, a through hole for accommodating the firing pin and allowing the firing pin to pass through is formed in the lower end of the lower conductive cap, the second pressure spring is arranged in a cavity between the firing pin and the partition plate, the firing pin and the conductive rod are connected; the contact comprises a conductive tube, an upper moving contact and an operating ring, wherein the upper moving contact is arranged at the upper end of the conductive tube, and the operating ring is arranged on one side of the conductive tube; a through hole for a firing pin to pass through is formed between the inner top wall of the base and the upper end of the base, the lower end of the high-pressure fusion tube is connected with the upper end of the base through a lower conductive cap, and the upper end of the high-pressure fusion tube is connected with the lower end of the conductive tube through an upper conductive cap.
Preferably, the indicating piece is a shell with an opening at the lower end, the indicating piece is sleeved on the first pressure spring, and a normal indicating mark or/and a disconnection indicating mark is/are arranged on one side of the indicating piece facing the observation window.
Preferably, a positioning boss for positioning the first pressure spring is arranged in the base, and the lower end of the first pressure spring is sleeved on the positioning boss.
Preferably, the conductive rod is a silver melt.
Preferably, the upper conductive cap and the lower conductive cap are both nickel-plated copper caps.
Preferably, the lower end of the lower conductive cap is provided with an external thread, the upper end of the base is internally provided with an internal thread, and the lower end of the high-pressure fusion tube is in threaded connection with the upper end of the base through the lower conductive cap.
Preferably, the upper end of the upper conductive cap is provided with external threads, the lower end of the conductive tube is internally provided with internal threads, and the upper end of the high-voltage fusion tube is in threaded connection with the lower end of the conductive tube through the upper conductive cap.
The fuse wire is arranged in the high-pressure fuse tube with a small gap between the lower end of the lower conductive cap and the firing pin, and the lower end of the high-pressure fuse tube is connected with the upper end of the base through the lower conductive cap, so that the fuse wire is positioned in a closed space isolated from the outside, and further, outside moisture, rainwater, dust and the like are effectively prevented from entering the fuse tube, and the fuse wire is prevented from being affected with damp, oxidized and corroded; after the fuse is normally fused, the pulling force of the fuse on the firing pin disappears, at the moment, the firing pin extends out of the through hole at the lower end of the lower conductive cap under the action of the elastic force of the second pressure spring and enters the through hole in the base for the firing pin to pass through, and then the firing pin presses down the indicating piece of the indicating device in the base and the first pressure spring, so that when a maintenance worker overhauls the fuse, the breaking indicating mark on the indicating piece can be seen through the observation window on the side wall of the base, the fused information of the fuse can be easily known, and the maintenance of the maintenance worker is facilitated; after the fuse wire is fused, the fuse wire can not fall out of the fuse tube, thereby avoiding the problems of fire, short circuit and the like.
Therefore, the invention can effectively protect the internal fuse wire, avoid the fuse wire from being affected with damp and oxidized corrosion, simultaneously can automatically indicate the fusing state of the fuse wire after the fuse wire is normally fused, is convenient for maintenance personnel to maintain, can not fall out of the fusion tube after the fuse wire is fused, thereby avoiding the problems of fire, short circuit and the like, solving the problems that the existing drop-out switch fuse wire is easy to be affected with damp, oxidized and corroded, the resistance of the fuse wire is increased, the strength is reduced, and the fuse wire is abnormally fused or cracked, simultaneously solving the problems of inconvenient maintenance or fire, short circuit and the like, and having the advantages of safety, reliability, convenient use and the like.
Drawings
Fig. 1 is a schematic overall structure diagram of a drop-out fuse according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a point A according to a first embodiment of the present invention;
fig. 3 is an external structural view of a high-voltage fuse tube of the drop-out fuse shown in fig. 1;
FIG. 4 is a schematic semi-sectional view of the high pressure fusion tube shown in FIG. 3;
in the figure: 1. a base; 11. positioning the boss; 12. an observation window; 2. a support; 21. hanging a pin; 3. an indicating device; 31. an indicator; 32. a first pressure spring; 311. a disconnection indication flag; 312. a normal indicator; 4. high-pressure fusion tubes; 41. a high voltage insulating tube; 42. a partition plate; 43. quartz sand; 44. a conductive rod; 45. An upper conductive cap; 46. a lower conductive cap; 47. a second pressure spring; 48. a striker; 49. a fuse; 51. a conductive tube; 52. an upper moving contact; 53. and (6) operating the ring.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 4, the drop-out fuse of this embodiment includes a base 1, a high-voltage fuse tube 4 and a contact, a support 2 is disposed on one side of the base 1, a hanging pin 21 is disposed on the support 2, the base 1, the support 2 and the hanging pin 21 are all conductors, an indicating device 3 for indicating the normal and disconnected states of a fuse in the high-voltage fuse tube 4 is disposed in the base 1, correspondingly, an observation window 12 is disposed on a side wall of the base 1, the indicating device 3 includes an indicating member 31 and a first pressure spring 32, the indicating member 31 is disposed on the first pressure spring 32, and under the pressing action of the first pressure spring 32, the upper end of the indicating member 31 contacts with a top wall in the base 1, and an indicating mark is disposed on one side of the indicating member 31 facing the observation window; the high-voltage fuse tube 4 comprises a high-voltage insulating tube 41, a partition plate 42, quartz sand 43, a conductive rod 44, an upper conductive cap 45, a lower conductive cap 46, a second pressure spring 47, a firing pin 48 and a fuse 49, wherein the partition plate 42 is installed at the lower part in the high-voltage insulating tube 41, the quartz sand 43 is filled in the high-voltage insulating tube 1 from the upper end to the partition plate 42, the lower end of the conductive rod 44 is inserted into the quartz sand 43 from the upper end of the high-voltage insulating tube 41, the upper conductive cap 45 is packaged at the upper end of the high-voltage insulating tube 41 and covers the conductive rod 44 inside, the lower conductive cap 46 is installed at the lower end of the high-voltage insulating tube 41, a through hole for accommodating and passing through the firing pin 48 is formed at the lower end of the lower conductive cap 46, the second pressure spring 47 is arranged in a cavity between the firing pin 48 and the partition plate 42, the firing pin 48 and the conductive rod 44 are connected in a, A partition plate 42 and a second compression spring 47; the contact comprises a conductive tube 51, an upper moving contact 52 and an operating ring 53, wherein the upper moving contact 52 is arranged at the upper end of the conductive tube 51, and the operating ring 53 is arranged at one side of the conductive tube 51; a through hole for a firing pin 48 to pass through is arranged between the inner top wall of the base 1 and the upper end of the base 1, the lower end of the high-voltage fusion tube 4 is connected with the upper end of the base 1 through a lower conductive cap 46, and the upper end of the high-voltage fusion tube 4 is connected with the lower end of a conductive tube 51 through an upper conductive cap 45.
Preferably, the indicator 31 is a housing with an open lower end, the indicator 31 is sleeved on the first compression spring 32, and a normal indicator 312 or/and a disconnection indicator 311 are/is arranged on one side of the indicator 31 facing the observation window 12. The indicator 31 and the first compression spring 32 with the structure can keep a stable position relationship, thereby ensuring the reliability of the indicating device.
In order to relatively fix the position of the first pressure spring 32 and ensure the reliability of the indicating device, it is preferable that a positioning boss 11 for positioning the first pressure spring 32 is arranged in the base 1, and the lower end of the first pressure spring 32 is sleeved on the positioning boss 11.
To demonstrate the good conductivity of the conductive rod 44, the conductive rod 44 is preferably a silver melt.
To prove the good conductivity of the upper conductive cap 45 and the lower conductive cap 46, preferably, the upper conductive cap 45 and the lower conductive cap 46 are both nickel-plated copper caps.
Preferably, the lower end of the lower conductive cap 46 is provided with external threads, the upper end of the base 1 is provided with internal threads, and the lower end of the high-voltage fusion tube 4 is in threaded connection with the upper end of the base 1 through the lower conductive cap 46.
Preferably, the upper end of the upper conductive cap 45 is provided with an external thread, the lower end of the conductive tube 51 is provided with an internal thread, and the upper end of the high-voltage fusion tube 4 is in threaded connection with the lower end of the conductive tube 51 through the upper conductive cap 45.
The hanging pin 21 and the upper moving contact 52 are connection points of the drop-out fuse of the invention and an external circuit.
The operation ring 53 is used to perform an opening and closing operation of the drop-out fuse of the present invention using a brake lever.
After the fuse is fused, only the high-voltage fuse tube needs to be replaced, and a contact and an indicating device do not need to be replaced, so that the fuse is convenient and economical.
The fuse wire is arranged in the high-pressure fuse tube with a small gap between the lower end of the lower conductive cap and the firing pin, and the lower end of the high-pressure fuse tube is connected with the upper end of the base through the lower conductive cap, so that the fuse wire is positioned in a closed space isolated from the outside, and further, outside moisture, rainwater, dust and the like are effectively prevented from entering the fuse tube, and the fuse wire is prevented from being affected with damp, oxidized and corroded; after the fuse is normally fused, the pulling force of the fuse on the firing pin disappears, at the moment, the firing pin extends out of the through hole at the lower end of the lower conductive cap under the action of the elastic force of the second pressure spring and enters the through hole in the base for the firing pin to pass through, and then the firing pin presses down the indicating piece of the indicating device in the base and the first pressure spring, so that when a maintenance worker overhauls the fuse, the breaking indicating mark on the indicating piece can be seen through the observation window on the side wall of the base, the fused information of the fuse can be easily known, and the maintenance of the maintenance worker is facilitated; after the fuse wire is fused, the fuse wire can not fall out of the fuse tube, thereby avoiding the problems of fire, short circuit and the like.
Therefore, the invention can effectively protect the internal fuse wire, avoid the fuse wire from being affected with damp and oxidized corrosion, simultaneously can automatically indicate the fusing state of the fuse wire after the fuse wire is normally fused, is convenient for maintenance personnel to maintain, can not fall out of the fusion tube after the fuse wire is fused, thereby avoiding the problems of fire, short circuit and the like, solving the problems that the existing drop-out switch fuse wire is easy to be affected with damp, oxidized and corroded, the resistance of the fuse wire is increased, the strength is reduced, and the fuse wire is abnormally fused or cracked, simultaneously solving the problems of inconvenient maintenance or fire, short circuit and the like, and having the advantages of safety, reliability, convenient use and the like.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention should be construed as being limited thereto.
Claims (7)
1. The utility model provides a drop out fuse, includes base, high-pressure fusion tube and contact, its characterized in that: a bracket is arranged on one side of the base, a hanging pin is arranged on the bracket, an indicating device used for indicating the normal and disconnected states of a fuse wire in the high-voltage fuse tube is arranged in the base, correspondingly, an observation window is arranged on the side wall of the base, the indicating device comprises an indicating piece and a first pressure spring, the indicating piece is arranged on the first pressure spring, the upper end of the indicating piece is contacted with the top wall in the base under the jacking action of the first pressure spring, and an indicating mark is arranged on one side of the indicating piece facing the observation window; the high-voltage fuse tube comprises a high-voltage insulating tube, a partition plate, quartz sand, a conductive rod, an upper conductive cap, a lower conductive cap, a second pressure spring, a firing pin and a fuse wire, wherein the partition plate is arranged at the lower part in the high-voltage insulating tube, the quartz sand is filled in the high-voltage insulating tube from the upper end to the space between the partition plate, the lower end of the conductive rod is inserted into the quartz sand from the upper end of the high-voltage insulating tube, the upper conductive cap is packaged at the upper end of the high-voltage insulating tube and covers the conductive rod inside, the lower conductive cap is arranged at the lower end of the high-voltage insulating tube, a through hole for accommodating the firing pin and allowing the firing pin to pass through is formed in the lower end of the lower conductive cap, the second pressure spring is arranged in a cavity between the firing pin and the partition plate, the firing pin and the conductive rod are connected; the contact comprises a conductive tube, an upper moving contact and an operating ring, wherein the upper moving contact is arranged at the upper end of the conductive tube, and the operating ring is arranged on one side of the conductive tube; a through hole for a firing pin to pass through is formed between the inner top wall of the base and the upper end of the base, the lower end of the high-pressure fusion tube is connected with the upper end of the base through a lower conductive cap, and the upper end of the high-pressure fusion tube is connected with the lower end of the conductive tube through an upper conductive cap.
2. A drop out fuse as claimed in claim 1, wherein: the indicating piece is a shell with an opening at the lower end, the indicating piece is sleeved on the first pressure spring, and a normal indicating mark or/and a disconnection indicating mark is/are arranged on one side of the indicating piece facing the observation window.
3. A drop out fuse as claimed in claim 1, wherein: the base is internally provided with a positioning boss for positioning the first pressure spring, and the lower end of the first pressure spring is sleeved on the positioning boss.
4. A drop out fuse as claimed in claim 1, wherein: the conductive rod is silver melt.
5. A drop out fuse as claimed in claim 1, wherein: the upper conductive cap and the lower conductive cap are both nickel-plated copper caps.
6. A drop out fuse as claimed in claim 1, wherein: the lower end of the lower conductive cap is provided with external threads, the upper end of the base is internally provided with internal threads, and the lower end of the high-pressure fusion tube is in threaded connection with the upper end of the base through the lower conductive cap.
7. A drop out fuse as claimed in claim 1, wherein: the upper end of the upper conductive cap is provided with external threads, the lower end of the conductive tube is internally provided with internal threads, and the upper end of the high-voltage fusion tube is in threaded connection with the lower end of the conductive tube through the upper conductive cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110281242.2A CN113130274A (en) | 2021-03-16 | 2021-03-16 | Drop-out fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110281242.2A CN113130274A (en) | 2021-03-16 | 2021-03-16 | Drop-out fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113130274A true CN113130274A (en) | 2021-07-16 |
Family
ID=76773175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110281242.2A Pending CN113130274A (en) | 2021-03-16 | 2021-03-16 | Drop-out fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113130274A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114121387A (en) * | 2021-11-29 | 2022-03-01 | 广东电网有限责任公司 | Device capable of automatically displaying insulator insulation breakdown |
-
2021
- 2021-03-16 CN CN202110281242.2A patent/CN113130274A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114121387A (en) * | 2021-11-29 | 2022-03-01 | 广东电网有限责任公司 | Device capable of automatically displaying insulator insulation breakdown |
| CN114121387B (en) * | 2021-11-29 | 2024-04-30 | 广东电网有限责任公司 | Device capable of automatically displaying insulator insulation breakdown |
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