CN218568773U - Fuse-element and fuse-element breaking device that circuit protection device used - Google Patents
Fuse-element and fuse-element breaking device that circuit protection device used Download PDFInfo
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- CN218568773U CN218568773U CN202222768975.1U CN202222768975U CN218568773U CN 218568773 U CN218568773 U CN 218568773U CN 202222768975 U CN202222768975 U CN 202222768975U CN 218568773 U CN218568773 U CN 218568773U
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- 239000000155 melt Substances 0.000 claims abstract description 76
- 238000006073 displacement reaction Methods 0.000 claims abstract description 39
- 210000003739 neck Anatomy 0.000 claims description 25
- 238000010791 quenching Methods 0.000 claims 1
- 238000010891 electric arc Methods 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000002679 ablation Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The invention relates to the field of electric power and new energy, in particular to a melt for a circuit protection device and a melt snapping device, wherein the melt comprises at least one clamping part for the melt snapping device to be arranged, and at least one row of mechanical breaking weak points are respectively arranged on two sides of the clamping part at intervals; the mechanical breaking weakness remains a distance from the edge of the clamping portion; the distance from the mechanical breaking weak part to the edge of the clamping part meets the following requirements: when the snapping device is arranged at the clamping part and the melt is snapped, the formed fracture is positioned at the mechanical breaking weak part, and electric arcs generated by the fracture cannot enter a displacement channel where the snapping device is positioned. The invention can prevent the electric arc generated at the fracture from entering the displacement channel where the breaking device is positioned, prevent the shell from cracking or breaking, and improve the arc extinguishing capability and the breaking capability.
Description
Technical Field
The invention relates to the field of electric power and new energy, in particular to a melt structure capable of being broken and a melt breaking structure used in a circuit protection device.
Background
Conventional fuses rely on the physical properties of the fuse element, which melts in the arc-extinguishing medium and quickly establishes reliable insulation when a short-circuit current occurs, thereby breaking the circuit. The excitation fuse is triggered by an external device, the moving part is driven to cut off the melt to achieve circuit disconnection, arc extinguishing media at the cut-off position are few, a slit structure is adopted, arc extinguishing can be achieved rapidly and reliably through the slit arc extinguishing mode for small current, however, for large current, particularly under the condition of large inductance, a large amount of electric arcs can be generated at the fracture position, the shell can be cracked through instantly generated electric arc energy and high-temperature high-pressure gas generated by arc ablation non-arc extinguishing media, and even the product is cracked due to breaking failure.
For example, chinese patent 2022200325751 discloses a high voltage, small volume actuated fuse, which has a structure of push block and guide block for breaking the fuse element, and the push block and guide block form a device for breaking the fuse element, but the specific structure of the fuse element is not disclosed. The fracture when the melt breaks off may be present in the arc-extinguishing medium and also in the displacement channel in which the push block and the guide block are located. When the fault current is large current, when the fracture is located in the displacement channel or is close to the displacement channel, a large amount of electric arcs generated at the fracture can enter the displacement channel, and the generated electric arc energy and ablation can cause large impact force on the shell, so that the shell is cracked or exploded.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a melt for a circuit protection device and a melt snapping device, which can enable the fracture of the melt to be snapped to be far away from a channel where a pushing block and a guide block are located, enable the fracture to be located in an arc extinguishing medium, and perform arc extinguishing through the arc extinguishing medium, thereby improving the arc extinguishing capability and the breaking capability.
In order to solve the technical problems, the technical scheme provided by the invention is that the melt for the circuit protection device comprises at least one clamping part for the melt snapping device to be arranged, and at least one row of mechanical breaking weak points are respectively arranged on two sides of the clamping part at intervals; the mechanical break weakness is spaced from the edge of the grip portion; the distance from the mechanical breaking weakness to the grip edge satisfies: when the snapping device is arranged at the clamping part and the melt is snapped, the fracture is located at the weak mechanical breaking part, and electric arcs generated by the fracture cannot enter a displacement channel where the snapping device is located.
Preferably, the mechanical break-away weakness is a throat, each row of throats comprising a plurality of throats spaced in parallel across the width of the melt.
Preferably, when the number of the clamping parts is more than two, at least one row of narrow neck parts is arranged between two adjacent clamping parts; when more than two rows of narrow neck parts are arranged between the two clamping parts, the more than two rows of narrow neck parts can be arranged at intervals.
Preferably, the narrow neck portions near both sides of the clamping portion have the same narrow neck width.
Preferably, the variable cross-sectional structures forming the throat may be the same or different.
Preferably, through holes for arranging the melt breaking device are arranged at intervals on the clamping part.
Preferably, the two ends of the melt are connecting ends, and the melt part between the connecting end and the mechanical breaking weak point close to the connecting end is of a porous structure.
Preferably, the porous structure is formed by at least one row of through holes which are arranged at intervals in parallel along the width of the melt.
The invention also provides a melt breaking device which comprises at least one displacement channel, wherein arc extinguishing mediums are arranged on two sides of the displacement channel; the melt penetrates through the arc-extinguishing medium and the displacement channel and is fixed; a clamping part of the melt is positioned in the displacement channel, and a mechanical breaking weak point of the melt is positioned in the arc-extinguishing medium; the snapping device is arranged in the displacement channel and clamps the melt clamping part; when the breaking device breaks the melt, the melt is broken from the mechanical breaking weak point, and the formed fracture is located in the arc extinguishing medium.
Preferably, when the number of the displacement channels is more than two and the displacement channels are arranged at intervals, an arc extinguishing medium is arranged between every two adjacent displacement channels, and a mechanical breaking weak point between two clamping parts of the melt in every two adjacent displacement channels is located in the arc extinguishing medium between every two adjacent displacement channels.
The melt and the melt snapping device can ensure that a fracture formed after the melt is snapped is positioned in the arc extinguishing medium on one side of the snapping device, and the arc is extinguished through the arc extinguishing medium, so that the electric arc generated at the fracture cannot enter a displacement channel where the snapping device is positioned, thereby avoiding the safety accidents of shell cracking or shell explosion and the like possibly caused by the impact of electric arc energy, improving the arc extinguishing capability and the breaking capability, and improving the working safety and the reliability.
Drawings
FIG. 1 is a schematic view of the structure of a melt.
FIG. 2 is a schematic view of the structure of a melt.
FIG. 3 is a schematic view of the melt structure.
FIG. 4 is a schematic view of a melt and stretch-break apparatus configuration.
Fig. 5 is a schematic view of the configuration of the melt in cooperation with the snapping device, displacement channels, arc-extinguishing medium, etc.
Detailed Description
To address the above issues, the present invention will now be described in detail with reference to the drawings.
The melt structure for the circuit protection device of the present invention is schematically illustrated in three structures of the melt shown in fig. 1 to 3, and the melt 10 is made of a conductive material and has a planar structure. The melt 10 comprises a clamping portion 11, a narrow neck portion 12, a porous structure 13 and a connecting end 14.
One or more clamping portions 11 may be provided at intervals. In the present embodiment, the clamping portion 11 is provided at two intervals. The clamping portion 11 is used for arranging a melt breaking device, so that the mechanical strength of the clamping portion 11 is far higher than that of the narrow neck portion 12. A through hole 110 for the snapping device to clamp and fix is opened at the clamping portion 11.
At least one row of narrow neck portions 12 is provided on both sides of each grip portion 11. A row of narrow neck portions 12 can be shared between two adjacent clamping portions 11. The narrow necks 120 of the narrow necks 12 close to the two sides of the clamping part 11 have the same width, so that when the melt breaking device breaks, the narrow necks at the two sides of the clamping part 11 are uniformly stressed and can be broken simultaneously. Each row of narrow neck portions 12 is formed by a plurality of through holes 121 arranged in parallel and spaced apart. The narrow neck 120 is located at the minimum distance between two adjacent through holes. The variable cross-section structures 122 on both sides of the throat 120 may be the same or different, and are designed according to actual needs. The distance between the narrow neck 120 of the narrow neck part 12 close to the two sides of the clamping part 11 and the edge of the clamping part 11 must satisfy the following conditions: when the snapping means provided with the clamping portion 11 snaps the melt 10, the arc generated by the fracture formed at the throat 120 does not enter the displacement channel in which the snapping means is located.
The melt 10 has terminals 14 at both ends, and the terminals 14 may be electrically connected to an external circuit or in parallel with other conductive elements. The connection end 14 has sufficient mechanical strength.
The porous structure 13 is located between the connecting end 14 and the throat 12 proximate the connecting end 14. The porous structure 13 is composed of at least one row of through holes 130 arranged in parallel and at intervals along the width of the melt 10, the distance between two adjacent through holes in each row is the same or different, and the shapes of the through holes can be the same or different. The shape and size of the through holes of the different rows may be the same or different.
The throat 12 of the melt 10 is a mechanical breaking weak point of the melt, and is also a stress concentration point, and when the melt is fractured by pulling, the melt is first broken from the throat 12 to form a fracture.
In addition to the narrow neck of the present embodiment as the mechanical breaking weak point, the mechanical breaking of the melt can be realized by forming a mechanical breaking weak point, such as a V-shape, a U-shape, etc., on the melt, instead of the narrow neck, at a position corresponding to the narrow neck.
The melt breaking device, see fig. 4 to 5, comprises at least one displacement channel 15, in this embodiment, the displacement channel 15 is two spaced apart. Arc extinguishing media 16 are arranged on two sides of each displacement channel 15; the melt 10 passes through the arc-extinguishing medium 16 and the displacement channel 15 and is fixed against displacement when it is snapped off. The connecting end 14 of the melt 10 is located outside the arc-extinguishing medium, facilitating its electrically conductive connection to an external circuit or in parallel with a conductive element a connectable into an external circuit. The throat 12 of the melt 10 is located in an arc-extinguishing medium 16.
A snapping device is arranged in the displacement channel 15. The snapping device comprises a push block 17 and a guide block 18 which are designed in a nested manner, wherein the push block 17 and the guide block 18 penetrate through a through hole on the clamping part 11 of the melt 10 in the displacement channel 15 and clamp the clamping part 11 of the melt 10 between the contact surfaces thereof.
When the melt breaking device acts, the melt breaking device pulls the melt 10 to be displaced along the displacement channel 15 together under the action of the driving force, and the melt 10 is broken from the mechanical breaking weak point, and a fracture is formed at the mechanical breaking weak point. Because the weak position of mechanical disconnection is kept away from the edge of breaking device and clamping part, consequently, can guarantee that melt 10 is broken by the pull back, the fracture that its formed still is located arc extinguishing medium, and the electric arc that produces in fracture department also is located arc extinguishing medium, carries out the arc extinguishing through arc extinguishing medium, and the electric arc that produces in fracture department can not get into the displacement channel that the breaking device was located, has avoided split shell or fried shell. The arc extinguishing capacity and the breaking capacity are improved, and the working safety is improved.
Claims (10)
1. The melt for the circuit protection device is characterized by comprising at least one clamping part for the melt breaking device, wherein at least one row of mechanical breaking weak points are respectively arranged at two sides of the clamping part at intervals; the mechanical break weakness is spaced from the edge of the grip portion; the distance from the mechanical breaking weakness to the grip edge satisfies: when the snapping device is arranged at the clamping part and the melt is snapped, the fracture is located at the weak mechanical breaking part, and electric arcs generated by the fracture cannot enter a displacement channel where the snapping device is located.
2. The melt for a circuit protection device of claim 1 wherein said mechanical discontinuity is a throat, each row of throats including a plurality of throats spaced in parallel across the width of said melt.
3. The fuse element for circuit protection device according to claim 2, wherein when there are more than two clamping portions, at least one row of narrow neck portions is disposed between two adjacent clamping portions; when more than two rows of narrow neck parts are arranged between the two clamping parts, the more than two rows of narrow neck parts can be arranged at intervals.
4. The fuse element of claim 2, wherein the narrow neck portions adjacent to the sides of the clamping portion have the same narrow neck width.
5. The fuse element of claim 4, wherein the cross-sectional configurations of the necks are the same or different.
6. The fuse element of claim 1, wherein said clamping portions are spaced apart to define through holes for the fuse element breaking means.
7. The fuse element of claim 1, wherein the ends of the fuse element are connection ends, and the portion of the fuse element between the connection ends and the mechanical break-away weakness proximate the connection ends is a porous structure.
8. The melt for a circuit protection device of claim 7 wherein said porous structure comprises at least one row of spaced apart through holes extending parallel to the width of the melt.
9. A melt breaking device is characterized by comprising at least one displacement channel, wherein arc extinguishing mediums are arranged on two sides of the displacement channel; the melt of any one of claims 1 to 8 passing through the arc-quenching medium and the displacement channel and being fixed; a clamping part of the melt is positioned in the displacement channel, and a mechanical breaking weak point of the melt is positioned in the arc-extinguishing medium; the snapping device is arranged in the displacement channel and clamps the clamping part of the melt; when the melt is snapped by the snapping device, the melt is broken from the mechanical breaking weak point, and a fracture is formed and positioned in the arc-extinguishing medium.
10. The apparatus of claim 9, wherein when the displacement channels are spaced apart from each other by two or more lengths, an arc-extinguishing medium is disposed between two adjacent displacement channels, and a mechanical breaking weak point between two clamping portions of the melt in two adjacent displacement channels is disposed in the arc-extinguishing medium between two adjacent displacement channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222768975.1U CN218568773U (en) | 2022-10-20 | 2022-10-20 | Fuse-element and fuse-element breaking device that circuit protection device used |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222768975.1U CN218568773U (en) | 2022-10-20 | 2022-10-20 | Fuse-element and fuse-element breaking device that circuit protection device used |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218568773U true CN218568773U (en) | 2023-03-03 |
Family
ID=85317760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222768975.1U Active CN218568773U (en) | 2022-10-20 | 2022-10-20 | Fuse-element and fuse-element breaking device that circuit protection device used |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218568773U (en) |
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2022
- 2022-10-20 CN CN202222768975.1U patent/CN218568773U/en active Active
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