Melt structure of high-speed fuse
By designing the V-shaped groove and tin bar structure of the metal fuse in the fuse, the problem of small multiples of overload current cannot be quickly fused, and effective protection of the circuit is achieved.
Patent Information
- Application Number
- CN202421081528.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-17
AI Technical Summary
Existing fuses cannot be fused quickly when facing small multiples of overload current, resulting in the inability to effectively protect the circuit.
A melt structure of a fast fuse is designed, using metal fuses to be bent along the long side to form a V-shaped groove, and tin strips are filled in the V-shaped groove. The hole diameters of the two sets of holes in the middle are large, and the outer side is equipped with Insulating tapes are used to isolate heat.
Through the combined design of V-shaped grooves and tin bars, the heat transfer efficiency is enhanced, the rapid fuse of the melt is promoted, and the circuit is effectively protected, especially when the circuit is cut off quickly when the overload current is small.
Smart Images
Figure CN222462808U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of fuses, and in particular to a fuse structure of a fast fuse. Background Art
[0002] A fuse is an electrical device that uses the heat generated by itself to melt the fuse and disconnect the circuit when the current exceeds the specified value. The working principle of a fuse is to use a metal conductor as a fuse in series in the circuit. When an overload or short-circuit current passes through the fuse, it melts due to its own heat, thereby disconnecting the circuit. Fuses are widely used in high and low voltage power distribution systems and control systems as well as electrical equipment as short-circuit and overcurrent protectors.
[0003] The fuse is a key part of the fuse and a key element that controls the fusing characteristics. The fuse is filled with high-melting-point metal wire or copper foil. When the current flowing in the circuit exceeds the specified value, the metal wire or copper foil in the fuse melts, thereby quickly disconnecting the circuit to protect the safety of the circuit. The material, size and shape of the fuse determine the fusing characteristics.
[0004] In the related technology, the fuse element structure has a good protective effect for overload current or short-circuit current of more than 4 times. Overload current of more than 4 times can quickly heat up, so that the fuse element melts to disconnect the circuit. However, with the development of new energy and the refined management of equipment lines, it is required that overload current of small multiples (1.35-2 times) also has a good protective effect. However, overload current of small multiples generates less heat, so it is impossible to achieve rapid melting of the fuse element, and thus the fuse cannot stably play its protective role on the circuit. Summary of the invention
[0005] In order to enable the fuse to blow quickly even for a small multiple of the overload current, the present application provides a fuse structure of a fast fuse.
[0006] The present application provides a fast fuse with a fuse structure that adopts the following technical solution:
[0007] A fuse structure of a fast fuse includes a metal fuse piece;
[0008] The metal melting sheet is bent to form a V-shaped groove at the center along the long side direction, and the V-shaped groove of the metal melting sheet is filled with a tin bar;
[0009] The metal melting sheet is provided with a plurality of rows of holes arranged at intervals along its length direction, the V-shaped groove and the tin bar are located between the two middle rows of holes, and a narrow diameter is formed between adjacent holes in each row of holes;
[0010] The apertures of the two groups of holes in the middle are larger than the apertures of the other groups of holes. Two insulating rubber strips are respectively arranged on the outer sides of the two groups of holes in the middle, and the insulating rubber strips are fixedly connected to the metal melting sheet.
[0011] Optionally, the diameters of the two groups of holes in the middle are The diameters of the remaining holes are
[0012] Optionally, the row spacing between the two groups of rows of holes in the middle is L1, and the row spacing between the other two adjacent groups of rows of holes is equal and is L2, L1 = 5.2-7.6 mm, L2 = 8.0-14.0 mm.
[0013] Optionally, the thickness of the metal fusing sheet is 0.10-0.16 mm.
[0014] Optionally, the end distance between the outermost row of holes and the end of the metal melting piece is L3, where L3 = 11.0-16.0 mm.
[0015] Optionally, the metal frit is preferably a silver frit.
[0016] Optionally, the surface of the metal fusing sheet is coated with an insulating adhesive layer.
[0017] The present application also provides a fast fuse, which uses the above-mentioned fuse structure as a fuse.
[0018] In summary, the present application includes at least one of the following beneficial technical effects:
[0019] 1. The present application provides a clear positioning position for the tin bar through the V-shaped groove, ensuring that the tin bar is stably fixed in the metal melting piece. The design of the V-shaped groove increases the contact area between the tin bar and the metal melting piece, thereby enhancing the heat transfer efficiency between them. When a smaller multiple of overload current or short-circuit current appears in the circuit, the geometry of the V-shaped groove helps to guide the current concentration, so that the tin bar can melt faster, thereby cutting off the circuit. In addition, the V-shaped groove can increase the filling amount of the tin bar, which can enhance the "metallurgical effect" between the silver strip and the tin bar, thereby promoting the rapid melting of the metal melting piece.
[0020] 2. The present application uses two sets of large-diameter holes in the middle of the metal fuse to make the current and heat more concentrated through the large-diameter hole area when an overload or short circuit occurs in the circuit. This concentration effect will accelerate the temperature rise in the area, thereby promoting the fuse to melt faster at these locations; since the two sets of holes in the middle have larger apertures, the fuse will be relatively thinner at these locations and therefore easier to melt. In this way, during the melting process, the fuse will first begin to break in these weaker areas, forming an initial melting path. The two outer insulating strips more effectively isolate the transfer of heat to the surrounding area. For overload current, more heat is generated here within a certain period of time and continues to accumulate, and it can be ensured that during the melting process, the broken part of the fuse will not contact other surrounding circuits or components, thereby preventing secondary failures or injuries that may be caused by sparks or arcs generated by melting. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of the overall structure of a fuse structure of a fast fuse in an embodiment of the present application;
[0022] Figure 2 It is a cross-sectional view of the fuse structure of a fast fuse according to an embodiment of the present application.
[0023] Explanation of the reference numerals: 1. metal melting piece; 11. V-shaped groove; 12. row of holes; 2. tin bar; 3. insulating rubber strip. DETAILED DESCRIPTION
[0024] The following is combined with Figure 1-2 This application is described in further detail.
[0025] The present application embodiment discloses a fuse structure of a fast fuse. Figure 1 and Figure 2 A fuse structure of a fast fuse includes a metal fuse 1. In this embodiment, the metal fuse 1 is selected as a silver sheet. In other embodiments, the metal fuse 1 can also be selected as a copper sheet, a gold sheet, etc. Any metal sheet that can meet the specified conductive function can be used. The thickness of the metal fuse 1 is 0.12mm.
[0026] Reference Figure 1 and Figure 2 The metal melt 1 is bent at the center along the long side to form a V-shaped groove 11. The V-shaped groove 11 is filled with a tin bar 2. When the tin bar 2 is filled, the tin bar 2 is melted into tin liquid, and then the tin liquid is dripped into the V-shaped groove 11. After the tin liquid is cooled and solidified, the tin bar 2 is formed, and the top of the tin bar 2 is higher than the surface of the metal melt 1.
[0027] Reference Figure 1 and Figure 2The metal melting sheet 1 is provided with a plurality of rows of holes 12 arranged at intervals along its length direction, the V-shaped groove 11 and the tin bar 2 are located between the two middle groups of the rows of holes 12, and a narrow diameter is formed between adjacent holes of each group of the rows of holes 12.
[0028] Reference Figure 1 and Figure 2 The diameters of the two groups of holes 12 in the middle are The diameters of the remaining array holes 12 are In this embodiment
[0029] Reference Figure 1 and Figure 2 The narrow diameters between adjacent holes in the two groups of holes 12 in the middle are 0.14-0.16 mm, and the narrow diameters between adjacent holes in the remaining groups of holes 12 are 0.18-0.20 mm.
[0030] Reference Figure 1 and Figure 2 The spacing between the two groups of rows of holes 12 in the middle is L1, and the spacing between the other two adjacent groups of rows of holes 12 is equal and L2, L1 = 5.2-7.6 mm, L2 = 8.0-14.0 mm. In this embodiment, L1 = 5.5 mm, L2 = 13 mm.
[0031] Reference Figure 1 and Figure 2 The end distance between the outermost row of holes 12 and the end of the metal melting piece 1 is L3, L3 = 11.0-16.0 mm. In this embodiment, L3 = 15 mm.
[0032] Reference Figure 1 and Figure 2 Two insulating rubber strips 3 are respectively arranged on the outer sides of the two groups of rows of holes 12 in the middle. The insulating rubber strips 3 are arranged along the width direction of the metal melting piece 1, and the insulating rubber strips 3 are fixedly connected to the metal melting piece 1. The surface of the metal melting piece 1 is coated with an insulating rubber layer. The insulating rubber layer reduces the speed at which the heat of the metal melting piece 1 is transferred to the surroundings, and can also isolate the metal melting piece 1 from the external environment to prevent the occurrence of short circuits and electric shock accidents.
[0033] The implementation principle of the fuse structure of a fast fuse in the embodiment of the present application is as follows: when current passes through the metal fuse 1, since the narrow diameter width at the two groups of rows of holes 12 in the middle is smaller than that at other parts, the current density is greater than that at other parts, so the current generates the most heat here. The design of the V-shaped groove 11 shortens the distance between the two narrow diameters, reduces the space for heat transfer to the surroundings, and the insulating rubber strip 3 more effectively isolates the transfer of heat to the surroundings. For overload current, within a certain period of time, more heat is generated here, and it continues to accumulate, and the temperature gradually increases. The tin strip 2 has a "metallurgical effect" with the V-shaped groove 11 of the silver strip at high temperature. Since the current density at the V-shaped groove 11 is higher than that at other places, more heat is generated in the same time. Therefore, the V-shaped groove 11 is melted first, and the current is disconnected, which plays a protective role for both long-term small multiple (1.35 times) overload current and short-term large overload current (2 times); when a short-circuit current occurs, because the current is very large, the narrow and wide narrow diameters of the silver strip are melted almost at the same time, which plays a protective role for the short-circuit fault current. In practical applications, the thickness of the silver strip 1, the size of the holes at the narrow diameter, and the width of the row spacing can be adjusted according to different currents and operating requirements to achieve the desired protection effect.
[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A fuse structure of a fast fuse, characterized in that: It comprises a metal melting piece (1); The metal melting sheet (1) is bent to form a V-shaped groove (11) at the center along the long side direction, and the metal melting sheet (1) is filled with a tin bar (2) in the V-shaped groove (11); The metal melting sheet (1) is provided with a plurality of rows of holes (12) arranged at intervals along its length direction, the V-shaped groove (11) and the tin bar (2) are located between two middle groups of the rows of holes (12), and a narrow diameter is formed between adjacent holes in each group of the rows of holes (12); The apertures of the two groups of holes (12) located in the middle are larger than the apertures of the other groups of holes (12), and two insulating rubber strips (3) are respectively provided on the outer sides of the two groups of holes (12) located in the middle, and the insulating rubber strips (3) are fixedly connected to the metal melting sheet (1).
2. The fuse structure of a fast fuse according to claim 1, characterized in that: The diameters of the two groups of holes (12) in the middle are φ1, and the diameters of the remaining groups of holes (12) are φ2, φ1=2.3-3.0 mm, φ2=1.52-1.84 mm.
3. The fuse structure of a fast fuse according to claim 2, characterized in that: The row spacing between the two groups of rows of holes (12) located in the middle is L1, and the row spacing between the other two adjacent groups of rows of holes (12) is equal and is L2, L1=5.2-7.6mm, L2=8.0-14.0mm.
4. The fuse structure of a fast-acting fuse according to claim 1, characterized in that: The thickness of the metal fusing sheet (1) is 0.10-0.16 mm.
5. The fuse structure of a fast-acting fuse according to claim 1, characterized in that: The end distance between the row of holes (12) at the outermost side and the end of the metal melting sheet (1) is L3, where L3=11.0-16.0 mm.
6. The fuse structure of a fast-acting fuse according to claim 1, characterized in that: The metal frit (1) is a silver sheet.
7. The fuse structure of a fast-acting fuse according to claim 1, characterized in that: The surface of the metal fusing sheet (1) is coated with an insulating adhesive layer.
8. A fast fuse, characterized in that: The melt structure according to any one of claims 1 to 7 is used as the melt.