CN212587440U - SMD current fuse - Google Patents
SMD current fuse Download PDFInfo
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- CN212587440U CN212587440U CN202021745201.1U CN202021745201U CN212587440U CN 212587440 U CN212587440 U CN 212587440U CN 202021745201 U CN202021745201 U CN 202021745201U CN 212587440 U CN212587440 U CN 212587440U
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- current fuse
- end cap
- insulating tube
- fuse
- type current
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Abstract
The utility model belongs to the technical field of the fuse, especially, relate to a SMD current fuse, including insulating tube, insulating cover plate, end cap, fuse-element, arc extinguishing glue and the quartz sand that has well cavity, the lateral wall of insulating tube be provided with the notch of well cavity intercommunication, insulating cover plate seal set up in the notch, the end cap install in the insulating tube both ends, the fuse-element install in well cavity, the fuse-element with end cap electrically conductive connection, the arc extinguishing glue fill in well cavity tip, the quartz sand fill in the middle zone of well cavity. Compared with the prior art, the utility model discloses a SMD current fuse has high breaking performance, and the product yield is high.
Description
Technical Field
The utility model belongs to the technical field of the fuse, especially, relate to a SMD current fuse.
Background
A patch type current fuse is a disposable passive element for protecting a circuit, when the current is too large, the inherent resistance of a melt conductor hinders the current from passing to generate heat and raise the temperature, the heat dissipation capacity is smaller than the heat productivity, the accumulated temperature rise exceeds the melting point of the heat dissipation capacity, the melt is disconnected, the loop current is cut off, other components and circuits are protected, and the danger of fire, explosion and the like is prevented.
The existing patch type current fuse generally comprises two end electrodes and a ceramic tube, wherein a hollow structure is arranged in the ceramic tube, the two end electrodes are symmetrically arranged at two ends of the ceramic tube, a melt is arranged in the hollow structure in a suspended mode, quartz sand is filled in the hollow structure, and the melt is welded with the end electrodes. On one hand, the breaking performance of the existing patch type current fuse is limited; on the other hand, because the side wall of the ceramic tube is sealed and invisible, the filling condition of quartz sand in the ceramic tube cannot be judged, if the quartz sand is not filled or the filling condition is not ideal, the performance of the surface-mounted current fuse is influenced, even the product is directly scrapped, and the production yield is reduced.
In view of the above, it is necessary to provide a novel patch type current fuse, so as to improve the breaking performance thereof.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the patch type current fuse is provided, and has high breaking performance and high product yield.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a SMD current fuse, including insulating tube, insulating cover plate, end cap, fuse-element, arc extinguishing glue and the quartz sand that has well cavity, the lateral wall of insulating tube be provided with the notch of well cavity intercommunication, insulating cover plate seal set up in the notch, the end cap install in the insulating tube both ends, the fuse-element install in well cavity, the fuse-element with the end cap electrically conductive connection, the arc extinguishing glue fill in well cavity tip, the quartz sand fill in the middle zone of well cavity.
As an improvement of the surface mount type current fuse of the present invention, the length of the notch is greater than the length of the hollow cavity, and the width of the notch is greater than the width of the hollow cavity.
As a SMD current fuse's an improvement, the both ends of insulating tube set up to the stair structure, the end cap with the insulating tube tight fit is connected.
As an improvement of SMD current fuse, the end cap with be provided with the tin cream between the insulating tube, the fuse-element with after the end cap passes through the hot melt the tin cream is connected.
As a SMD current fuse's an improvement, insulating cover plate's shape size with the shape size phase-match of notch, insulating cover plate with the insulating tube is connected.
As an improvement of the surface mount type current fuse, the insulating tube and the insulating cover plate are made of ceramic.
As an improvement of SMD current fuse, the material of end cap is copper silver alloy or aluminum alloy, perhaps the surface of end cap is provided with tin coating, nickel coating, gold coating or silvered film.
As an improvement of the chip type current fuse of the present invention, the shape of the melt is wire-like, flat or narrow.
As an improvement of the chip type current fuse, the solder ball is soldered between the wire-shaped or narrow-diameter-shaped melts, and the flat melts are provided with irregular tangent planes.
As an improvement of the surface mount type current fuse, the material of the melt is red copper, manganin alloy, constantan alloy, silver-copper alloy or copper clad steel surface tin plating.
Compared with the prior art, the beneficial effects of the utility model include but are not limited to:
1) the utility model discloses pack arc extinguishing glue and quartz sand in the cavity of insulating tube, make the utility model discloses a SMD current fuse has dual arc function of putting out, and wherein, quartz sand is for putting out originally alone and alone, and arc extinguishing glue can release sulfur dioxide gas and produce the volume expansion, plays secondary isolating circuit and draws solitary effect, and arc extinguishing glue has the cushioning effect in addition, can absorb partial fusing energy in the twinkling of an eye.
2) The utility model discloses set up the notch with well cavity intercommunication at the lateral wall of insulating tube, on the one hand, it can conveniently instil into the arc extinguishing glue at the both ends of well cavity, improves the breaking performance of SMD current fuse, and on the other hand, its packing condition that can direct observation cavity intracavity arc extinguishing glue and quartz sand guarantees to carry out the encapsulation of apron again when filling arc extinguishing glue and quartz sand in the cavity, guarantees breaking performance and the product yield of SMD current fuse.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an exploded view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Fig. 4 is one of the structural schematic diagrams of the melt in the present invention.
Fig. 5 is a second schematic structural diagram of the melt in the present invention.
Wherein: 1-insulating tube, 2-insulating cover plate, 3-end cap, 4-melt, 5-arc extinguishing glue, 6-quartz sand, 7-solder paste, 8-solder bead, 11-hollow cavity and 12-notch.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
Referring to fig. 1 to 5, the utility model provides a SMD current fuse, including insulating tube 1 that has cavity 11 in the chamber, insulating cover plate 2, end cap 3, fuse-element 4, arc extinguishing glue 5 and quartz sand 6, the lateral wall of insulating tube 1 is provided with the notch 12 with cavity 11 intercommunication, insulating cover plate 2 is sealed to be set up in notch 11, end cap 3 is installed in insulating tube 1 both ends, fuse-element 4 is installed in cavity 11, fuse-element 4 and end cap 3 electrically conductive connection, arc extinguishing glue 5 is filled in cavity 11 tip, quartz sand 6 is filled in the middle zone of cavity 11.
It should be noted that the arc extinguishing gel 5 filled in the end of the hollow cavity 11 and the quartz sand 6 filled in the middle area of the hollow cavity 11 both wrap the melt 4. The arc extinguishing glue 5 is silica gel or epoxy resin glue. The inventor discovers that the utility model discloses a SMD current fuse has dual arc function of putting out, and wherein, quartz sand 6 is for putting out alone originally, and arc extinguishing glue 5 can release sulfur dioxide gas and produce the volume expansion, plays the secondary isolating circuit and draws solitary effect, and arc extinguishing glue 5 still has the cushioning effect moreover, can absorb partial fusing energy in the twinkling of an eye. In addition, current SMD current fuse is because there is not the arc extinguishing glue, consequently, it can be done product size greatly for reaching breaking capacity, enlarges insulating tube inner space in order to play the protective capacities that divides of breaking, and the utility model discloses be provided with the arc extinguishing glue then can be done product size for a short time, the subsides of being convenient for are pasted the dress.
Further, the length of the notch 12 is greater than the length of the hollow cavity 11, and the width of the notch 12 is greater than the width of the hollow cavity 11. The size of notch 12 is greater than the size of well cavity 11, and on the one hand, it can conveniently drip into arc extinguishing glue 5 at the both ends of well cavity 11, improves the breaking performance of SMD current fuse, and on the other hand, it ensures that can be clear comprehensive see the filling condition of arc extinguishing glue 5 and quartz sand 6 in well cavity 11, ensures the performance and the yield of SMD current fuse.
Further, two ends of the insulating tube 1 are arranged to be step structures, and the end caps 3 are tightly matched and connected with the insulating tube 1.
Further, solder paste 7 is arranged between the end cap 3 and the insulating tube 1, and the melt 4 and the end cap 3 are connected through the hot-melted solder paste 7. The solder paste 7 is a soft mixture, and can completely attach the end cap 3 to the insulating tube 1 during assembly, and after attachment, the solder paste 7 is melted and connected with the melt 4 and the end cap 3 by heating in a high-frequency welding or laser welding mode and the like. And the utility model discloses an assemble earlier and weld again, its influence to the size of product is less, consequently, the utility model discloses a SMD current fuse structure size is more stable.
Further, the shape and size of the insulating cover plate 2 are matched with the shape and size of the notch 12, and the insulating cover plate 2 is connected with the insulating tube 1. When it is detected that the hollow cavity 11 is filled with the arc extinguishing glue 5 and the quartz sand 6, the insulating cover plate 2 is sealed at the notch 12, so that the insulating cover plate 2 and the insulating tube 1 form a sealed connection.
Furthermore, the insulating tube 1 and the insulating cover plate 12 are made of ceramic. The ceramic material has good insulating and heat conducting properties. In particular, it may be 95%, 75% or 99% alumina ceramic or 35% zirconia ceramic.
Further, the end cap 3 is made of copper-silver alloy or aluminum alloy, or the surface of the end cap 3 is provided with a tin plating layer, a nickel plating layer, a gold plating layer or a silver plating layer.
Further, the shape of the melt 4 is a wire-like shape, a flat shape, or a narrow diameter shape. I.e. the melt 4 may be a fuse or fuse link.
Furthermore, the solder ball 8 is soldered in the middle of the wire-shaped or narrow-diameter melt 4, and the flat melt 4 is provided with an irregular section. Namely, the solder ball 8 is soldered in the middle of the fuse, and the fuse has an irregular section. The position of the fusing point is fixed and centralized by the arrangement.
Further, the material of the melt 4 is red copper, manganin alloy, constantan alloy, silver copper alloy or tin plating on the surface of copper clad steel.
The utility model discloses a preparation method of SMD current fuse includes following step:
1) putting the melt 4 into the hollow cavity 11 of the insulating tube 1, and leading out two ends of the melt 4 from two ends of the hollow cavity 11;
2) dropping arc extinguishing glue 5 at two ends of the hollow cavity 11 to fix two ends of the melt 4, and filling quartz sand 6 in the middle area of the hollow cavity 11;
3) an insulating cover plate 2 is arranged at the position of the notch 12 and is connected with the insulating tube 1;
4) dripping solder paste 7 into the end cap 3, installing the end cap at two ends of the insulating tube 1 in a tight fit manner, and instantly melting the solder paste 7 in the end cap 3 by adopting an internal welding high-frequency or laser welding process;
5) and cleaning the packaged surface mount type current fuse, performing primary appearance full inspection, testing and marking, braiding and packaging, performing secondary appearance full inspection and the like, warehousing the packaged surface mount type current fuse if the surface mount type current fuse is qualified in the secondary appearance full inspection, and reporting and reworking if the surface mount type current fuse is unqualified in the secondary appearance full inspection.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The utility model provides a SMD current fuse, its characterized in that, including insulating tube, insulating cover plate, end cap, fuse-element, arc extinguishing glue and the quartz sand that has well cavity, the lateral wall of insulating tube be provided with the notch of well cavity intercommunication, insulating cover plate seal set up in the notch, the end cap install in the insulating tube both ends, the fuse-element install in well cavity, the fuse-element with end cap conductive connection, the arc extinguishing glue fill in well cavity tip, the quartz sand fill in the middle zone of well cavity.
2. The patch type current fuse according to claim 1, wherein a length of the notch is greater than a length of the hollow cavity, and a width of the notch is greater than a width of the hollow cavity.
3. The patch type current fuse according to claim 1, wherein two ends of the insulating tube are arranged in a step structure, and the end caps are tightly fitted and connected with the insulating tube.
4. The patch type current fuse according to claim 1, wherein a solder paste is disposed between the end cap and the insulating tube, and the melt and the end cap are connected by the solder paste after being melted.
5. The patch type current fuse according to claim 1, wherein the insulating cover plate is shaped and sized to match the shape and size of the notch, and the insulating cover plate is connected to the insulating tube.
6. The patch type current fuse according to claim 1, wherein the insulating tube and the insulating cover plate are made of ceramic.
7. The patch type current fuse according to claim 1, wherein the end cap is made of a copper-silver alloy or an aluminum alloy, or a tin-plated layer, a nickel-plated layer, a gold-plated layer or a silver-plated layer is disposed on a surface of the end cap.
8. The patch type current fuse according to claim 1, wherein the shape of the melt is wire-like, flat or narrow.
9. The patch type current fuse according to claim 8, wherein the wire-shaped or narrow-diameter-shaped fuse body is soldered with a solder ball at the center thereof, and the flat fuse body is provided with an irregular section.
10. The patch type current fuse according to claim 1, wherein the material of the melt is red copper, manganin alloy, constantan alloy, silver-copper alloy or tin plating on the surface of copper-clad steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021745201.1U CN212587440U (en) | 2020-08-20 | 2020-08-20 | SMD current fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021745201.1U CN212587440U (en) | 2020-08-20 | 2020-08-20 | SMD current fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212587440U true CN212587440U (en) | 2021-02-23 |
Family
ID=74652832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021745201.1U Active CN212587440U (en) | 2020-08-20 | 2020-08-20 | SMD current fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212587440U (en) |
-
2020
- 2020-08-20 CN CN202021745201.1U patent/CN212587440U/en active Active
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