CN116936314A - Surface-mounted fuse - Google Patents
Surface-mounted fuse Download PDFInfo
- Publication number
- CN116936314A CN116936314A CN202311061025.8A CN202311061025A CN116936314A CN 116936314 A CN116936314 A CN 116936314A CN 202311061025 A CN202311061025 A CN 202311061025A CN 116936314 A CN116936314 A CN 116936314A
- Authority
- CN
- China
- Prior art keywords
- cavity
- cap
- mounted fuse
- metal melt
- fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006004 Quartz sand Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 20
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010891 electric arc Methods 0.000 abstract description 4
- 238000002679 ablation Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 239000000155 melt Substances 0.000 description 9
- 238000004880 explosion Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- PQIJHIWFHSVPMH-UHFFFAOYSA-N [Cu].[Ag].[Sn] Chemical compound [Cu].[Ag].[Sn] PQIJHIWFHSVPMH-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000969 tin-silver-copper Inorganic materials 0.000 description 1
Classifications
-
- 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
- H01H85/38—Means for extinguishing or suppressing arc
-
- 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
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/165—Casings
- H01H85/17—Casings characterised by the casing material
-
- 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
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/165—Casings
- H01H85/175—Casings characterised by the casing shape or form
-
- 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
- H01H85/38—Means for extinguishing or suppressing arc
- H01H85/42—Means for extinguishing or suppressing arc using an arc-extinguishing gas
-
- 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
- H01H85/38—Means for extinguishing or suppressing arc
- H01H2085/388—Means for extinguishing or suppressing arc using special materials
Landscapes
- Fuses (AREA)
Abstract
The invention relates to the technical field of fuses, in particular to a surface-mounted fuse which comprises an insulating shell and a metal melt, wherein a side cavity and an inner table are arranged in the insulating shell, the side cavity is arranged at two ends of the inner table, a narrow cavity is arranged in the inner table and communicated with the side cavity, and the cross section area of the side cavity is larger than that of the narrow cavity; the metal melt penetrates through the narrow cavity, and two ends of the metal melt are arranged in the side cavity; the surface-mounted fuse has the advantages of high breaking capacity, lead-free design, simple production process, low cost and the like. According to the invention, the design of the insulating shell introduces four arc extinguishing mechanisms of rapid cooling effect of quartz sand on electric arc due to high thermal conductivity, increasing of mechanical strength of the wall thickness in the middle of the shell, improving of impact resistance, arc extinguishing effect of arc extinguishing gas generated by high-temperature ablation of the electric arc on the surface of the shell, providing of pressure relief space design due to increase of the sectional area of inner holes at two ends of the shell, and improving of breaking capacity of products.
Description
Technical Field
The invention relates to the technical field of fuses, in particular to a surface-mounted fuse.
Background
The fuse mainly comprises a melt and an insulator for supporting or protecting the melt, and metal wires or sheet electrodes and the like which are made of metal materials or slurry with lower melting points are used as the melt and are connected in series in a protected circuit, when the circuit or equipment in the circuit is overloaded or fails, the melt is instantaneously fused due to heating, so that the circuit is cut off, and the purpose of protecting the circuit or the equipment is achieved. With the development of fuse miniaturization, the breaking safety problem of the melt becomes one of important factors to be considered in the application of products. At the moment of overlarge fault current or short circuit disconnection, an arc with strong energy can be generated on the melt, if no material for extinguishing the arc is arranged near the melt, the fuse can burn and even have the danger of explosion, other noble elements in the circuit are burned out if the fuse is light, and even fire disaster can occur due to the ignition of the arc and the personal safety is endangered.
In addition to the large amount of heat energy generated by the melt during the breaking process, two types of pressure can also occur: the moment of the melt gasification arcing generates an explosion pressure in the form of pulses and an arcing pressure generated during the entire arcing. The conventional arc extinguishing material can generally take away heat by causing mass consumption on the surface of the material through physical and chemical changes such as pyrolysis, melting, evaporation, sublimation, erosion and the like of the material under the action of high-temperature heat flow, so that the heat energy influence generated during melt breaking is reduced. However, due to the existence of high temperature, conventional arc extinguishing materials such as quartz sand, silica gel, thermosetting resin, glass coating and the like often have no elastic buffering capacity for explosion pressure, and pyrolysis gas generated by an arc extinguishing component can further cause pressure rise in the arc extinguishing device, so that poor breaking of a fuse is easily caused during continuous arcing.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide a surface-mounted fuse.
The invention provides the following technical scheme:
the surface-mounted fuse comprises an insulating shell and a metal melt, wherein a side cavity and an inner table are arranged in the insulating shell, the side cavity is arranged at two ends of the inner table, a narrow cavity is arranged in the inner table and is communicated with the side cavity, and the cross section area of the side cavity is larger than that of the narrow cavity;
the metal melt penetrates through the narrow cavity, and two ends of the metal melt are arranged in the side cavities.
As a preferable technical scheme of the surface-mounted fuse, the inner table and the insulating shell are integrally formed.
As a preferable technical scheme of the surface-mounted fuse, the inner table is embedded in the insulating shell and welded and fixed.
As a preferable technical scheme of the surface-mounted fuse, the cross section of the side cavity is round or square.
As a preferable technical scheme of the surface-mounted fuse, the cross section shape of the narrow cavity is round or square.
As a preferable technical scheme of the surface-mounted fuse, arc extinguishing materials are filled in the narrow cavity and the side cavities.
As a preferable technical scheme of the surface-mounted fuse, end electrode caps are arranged at two ends of the insulating shell, a protruding portion is arranged on the outer side of the insulating shell, a concave cavity is formed in the inner wall of the end electrode cap, and the protruding portion is embedded in the concave cavity.
As a preferable technical scheme of the surface-mounted fuse, the end electrode cap comprises an inner cap and an outer cap, the concave cavity is formed in the inner cap, the inner cap is sleeved at the end of the insulating shell, and the outer cap is sleeved at the outer side of the inner cap.
As a preferable technical scheme of the surface-mounted fuse, the end electrode cap is provided with solder, and the solder connects the inner cap and the end of the metal melt.
As a preferable technical scheme of the surface-mounted fuse, the insulating shell is formed by injection molding of a high-temperature-resistant thermosetting resin material, and 20-40 wt% of glass fiber is added into the resin material; the arc extinguishing material is quartz sand material with 80-120 meshes.
The invention has the beneficial effects that: the surface-mounted fuse has the advantages of high breaking capacity, lead-free design, simple production process, low cost and the like. The design of the insulating shell in the surface-mounted fuse introduces four arc extinguishing mechanisms of rapid cooling effect of quartz sand on electric arcs due to high heat conductivity, increasing of mechanical strength of the middle wall thickness of the shell, improving of impact resistance, arc extinguishing effect of arc extinguishing gas generated by high-temperature ablation of the electric arcs on the surface of the shell, providing of pressure relief space design due to increase of sectional areas of inner holes at two ends of the shell, and improving breaking capacity of products.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic view of the overall cross-sectional structure of the device of the present invention;
FIG. 2 is a schematic cross-sectional view of the split design of the inner stage and the insulating housing in the present invention;
FIG. 3 is a schematic view of a side cavity in an insulated housing according to the present invention;
FIG. 4 is a schematic view of another embodiment of a side cavity in an insulated housing according to the present invention;
FIG. 5 is a schematic view of the structure of the end electrode cap of the present invention;
in the figure: the insulating housing 1, the metal melt 2, the side cavities 11, the inner stage 12, the narrow cavity 13, the arc extinguishing material 14, the end electrode cap 3, the boss 15, the concave cavity 31, the inner cap 33, the outer cap 34, and the solder 32.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary embodiments are not representative of all implementations consistent with one or more embodiments of the invention. Rather, they are merely examples of apparatus and methods that are consistent with aspects of one or more embodiments of the invention.
It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described. In some other embodiments, the method may include more or fewer steps than described herein. Furthermore, individual steps described in this disclosure may be broken down into multiple steps in other embodiments; while various steps described in this invention may be combined into a single step in other embodiments.
Referring to fig. 1 to 5, a surface-mounted fuse includes an insulating housing 1 and a metal melt 2, wherein a side cavity 11 and an inner platform 12 are provided in the insulating housing 1, the side cavity 11 is provided at two ends of the inner platform 12, a narrow cavity 13 is provided in the inner platform 12 and is communicated with the side cavity 11, and a cross section area of the side cavity 11 is larger than a cross section area of the narrow cavity 13; the metal melt 2 is arranged in the narrow cavity 13 in a penetrating way, and two ends of the metal melt 2 are arranged in the side cavities 11.
It should be noted that, the insulating housing 1 is injection molded by a high temperature resistant thermosetting resin material, including one or more of polyphenylene sulfide, polyimide, polyether ether ketone and polysulfone, and 20wt% -40 wt% of glass fiber is added into the resin material to improve the mechanical strength of the insulating housing and prevent the insulating housing from generating bad under the impact of explosion pressure generated when the fuse product is broken.
Further, the narrow cavity 13 and the side cavity 11 of the insulating housing 1 form a necking design with large two ends and small middle, so that the mechanical strength of the insulating housing 1 is improved due to enough wall thickness in the middle of the insulating housing 1, and the space of the side cavity 11 at the two ends of the insulating housing 1 is enlarged on the premise that gas is generated under the action of high-temperature electric arc to extinguish the electric arc, so that the impact of explosion pressure generated by melt breaking to the end electrode caps 3 at the two ends is relieved or dispersed, and the risk of uncapping is prevented.
Further, the metal melt 2 extends in the side cavities 11.
The metal melt 2 is a metal wire or sheet obtained from metallic silver, copper or an alloy thereof, and is optionally coated with a surface coating of silver, tin or the like on its surface.
Referring to fig. 1, an inner stage 12 is integrally formed with an insulating housing 1.
Referring to fig. 2, the inner stage 12 is embedded in the insulating housing 1 and welded and fixed.
Referring to fig. 3 and 4, the side cavity 11 has a circular or square cross-sectional shape; the narrow cavity 13 has a circular or square cross-sectional shape.
The narrow and narrow cavities 13 and the side cavities 11 are filled with arc extinguishing material 14.
The arc suppressing material 14 is preferably a 80 mesh to 120 mesh quartz sand material to allow for convenient filling even when the product volume is small.
Further, end electrode caps 3 are arranged at two ends of the insulating shell 1, a protruding part 15 is arranged at the outer side of the insulating shell 1, a concave cavity 31 is formed in the inner wall of the end electrode cap 3, and the protruding part 15 is embedded in the concave cavity 31; the end electrode cap 3 includes an inner cap 33 and an outer cap 34, the cavity 31 is provided on the inner cap 33, the inner cap 33 is sleeved on the end of the insulating housing 1, and the outer cap 34 is sleeved outside the inner cap 33.
The end electrode cap 3 is divided into an inner cap 33 and an outer cap 34, the inner cap 33 is tightly combined with the end of the insulating shell 1 in a mechanical pressing mode, and the outer cap 34 is arranged on the outer side of the inner cap 33 in a mechanical pressing mode, so that good electric connection between the inner cap, the outer cap and the metal melt is ensured.
Further, two ends of the insulating housing 1 may be formed with a protrusion at a position of two opposite sides or four sides, and accordingly, a recess 31 is formed at a position corresponding to the end electrode cap 3, and the protrusion 15 is pressed into the recess 31 when the inner cap 33 is mounted, so that the coupling strength of the end electrode cap 3 of the product can be greatly improved.
The end electrode cap 3 is provided with solder 32, and the solder 32 connects the inner cap 33 and the end of the metal melt 2.
The solder 32 is preferably a lead-free solder of tin copper or tin silver copper to meet the ROHS requirements.
The foregoing description of the preferred embodiment(s) of the invention is merely illustrative of the presently preferred embodiment(s) of the invention, and is not intended to limit the embodiment(s) of the invention to the particular form disclosed, since various modifications, equivalent arrangements, improvements, etc., may be made within the spirit and scope of the embodiment(s) of the invention.
Claims (10)
1. The surface-mounted fuse is characterized by comprising an insulating shell (1) and a metal melt (2), wherein a side cavity (11) and an inner table (12) are arranged in the insulating shell (1), the side cavity (11) is arranged at two ends of the inner table (12), a narrow cavity (13) is arranged in the inner table (12) and is communicated with the side cavity (11), and the cross section area of the side cavity (11) is larger than that of the narrow cavity (13);
the metal melt (2) is arranged in the narrow cavity (13) in a penetrating mode, and two ends of the metal melt (2) are arranged in the side cavity (11).
2. A surface mounted fuse as in claim 1, wherein the inner platform (12) is integrally formed with the insulating housing (1).
3. A surface mounted fuse as in claim 1, wherein the inner platform (12) is embedded in the insulating housing (1) and welded.
4. A surface mounted fuse as in claim 2 or 3, wherein the side cavities (11) are circular or square in cross-sectional shape.
5. A surface mounted fuse as in claim 4, characterized in that the narrow cavity (13) has a circular or square cross-sectional shape.
6. A surface mounted fuse as claimed in claim 5, characterized in that the narrow cavities (13) and the side cavities (11) are filled with an arc extinguishing material (14).
7. The surface mounted fuse of claim 6, wherein end electrode caps (3) are arranged at two ends of the insulating housing (1), a protruding portion (15) is arranged on the outer side of the insulating housing (1), a concave cavity (31) is formed in the inner wall of the end electrode cap (3), and the protruding portion (15) is embedded in the concave cavity (31).
8. The surface mounted fuse of claim 7, wherein the end electrode cap (3) comprises an inner cap (33) and an outer cap (34), the cavity (31) is disposed on the inner cap (33), the inner cap (33) is sleeved on the end of the insulating housing (1), and the outer cap (34) is sleeved outside the inner cap (33).
9. A surface mounted fuse as claimed in claim 8, characterized in that solder (32) is provided in the end electrode cap (3), the solder (32) connecting the inner cap (33) and the end of the metal melt (2).
10. The surface mount fuse of claim 8, wherein the insulating housing is injection molded from a high temperature resistant thermosetting resin material to which 20 to 40wt% glass fiber is added;
the arc extinguishing material is quartz sand material with 80-120 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311061025.8A CN116936314A (en) | 2023-08-22 | 2023-08-22 | Surface-mounted fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311061025.8A CN116936314A (en) | 2023-08-22 | 2023-08-22 | Surface-mounted fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116936314A true CN116936314A (en) | 2023-10-24 |
Family
ID=88386205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311061025.8A Pending CN116936314A (en) | 2023-08-22 | 2023-08-22 | Surface-mounted fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116936314A (en) |
-
2023
- 2023-08-22 CN CN202311061025.8A patent/CN116936314A/en active Pending
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |