CN203573925U - Temperature fuse - Google Patents
Temperature fuse Download PDFInfo
- Publication number
- CN203573925U CN203573925U CN201320684695.0U CN201320684695U CN203573925U CN 203573925 U CN203573925 U CN 203573925U CN 201320684695 U CN201320684695 U CN 201320684695U CN 203573925 U CN203573925 U CN 203573925U
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- China
- Prior art keywords
- fuse
- fuse link
- fusing
- cavity
- link
- 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.)
- Expired - Lifetime
Links
- 239000003292 glue Substances 0.000 claims description 9
- 239000005022 packaging material Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000007791 liquid phase Substances 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000008602 contraction Effects 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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- Fuses (AREA)
Abstract
The utility model discloses a temperature fuse which is characterized by including a cylindrical fuse link and a casing, the two ends of the fuse link are electrically connected with pins, the casing covers the fuse link and the connection parts of the pins and the fuse link, an external fusing chamber is arranged between the casing and the outer wall of the fuse link, the pins and the inner wall of the fuse link form an internal fusing chamber, and the internal fusing chamber and the external fusing chamber are filled with fuse-assisting agent. The fuse-assisting agent greatly enhances the interfacial tension of liquid-phase metal when the fuse link is in the fusing state, so that the liquid-phase metal contracts toward the pins rapidly to form a spherical liquid drop, and the fusing shape of the fuse link is stable and the contraction speed of the fuse link is fast, thereby realizing the rapid turn-off motion of a loop. Therefore, the temperature fuse overcomes the defects that the fusing shape of a fuse link is not stable and breaking failure rate is high, and the temperature fuse is high in reliability.
Description
Technical Field
The utility model relates to an overheat protection device specifically is a temperature fuse from fusing.
Background
The temperature fuse with overcurrent protection can sense overheating generated in abnormal operation of electric and electronic products, so that a current loop is cut off in a self-fusing mode, and a fire disaster caused by the condition of high-temperature continuous current is avoided.
Generally speaking, such a thermal fuse has great discreteness when fusing, and the process and the shape of fusing thereof are often uncontrollable, and incomplete fusing and unstable segmentation capability can occur under certain conditions, so that a current loop can be cut off and failed, and a protection effect cannot be achieved.
Due to the structural requirements of electronic products, part of the temperature fuses need to be in an axial type, namely a cylindrical shape, so as to meet the requirements of higher current values and voltage values in circuits. The cylindrical fusing part has a long transverse heat conducting path, so that the fusing form is difficult to ensure.
SUMMERY OF THE UTILITY MODEL
To current temperature fuse, especially temperature fuse fusing effect is not good, divide the problem of disconnected poor stability, the utility model provides a temperature fuse aims at overcoming its fusing shape unstability, divides the defect that the disconnected failure rate is high, and its technical scheme is as follows:
a thermal fuse, comprising:
the fuse link is cylindrical, and two ends of the fuse link are respectively and electrically connected with a pin;
the shell is coated at the connecting positions of the fuse link and the pins with the fuse link; an outer fusing cavity is arranged between the outer shell and the outer wall of the fuse link; an inner fusing cavity is formed by the pin and the inner wall of the fuse link; wherein,
and the inner fusing cavity and the outer fusing cavity are filled with fusing assistant.
As an improvement of this aspect, the following can be embodied:
in a preferred embodiment, the connecting portions of the pin and the two ends of the fuse link have opposite bowl-shaped openings, and concave surfaces of the bowl-shaped openings cover and are electrically connected and fixed to the two ends of the fuse link respectively.
In a preferred embodiment, the outer fuse cavity has a radially inwardly protruding projection therein, and the projection grips and fixes the outer wall of the fuse body.
In a preferred embodiment, the lead-out of the pins comprises radial and axial.
In the preferred embodiment, the housing includes a base and a cover; the base and the cover plate are buckled to form the outer fusing cavity.
In a preferred embodiment, the base has a glue filling cavity at each of the pin positions on two sides, and the glue filling cavity is filled with an encapsulating material, and the encapsulating material surrounds the pin in the glue filling cavity.
In a preferred embodiment, the encapsulating material covers the cover plate.
The beneficial effect of this scheme has:
the fluxing agent in the inner fusing cavity and the outer fusing cavity greatly enhances the tension of the liquid-phase metal on the interface when the fuse link is in a fused state, so that the liquid-phase metal is quickly contracted towards the pins to form spherical liquid drops, the fusing shape of the fuse link is stable, the retraction speed is high, and the quick turn-off action of a loop is realized. Therefore, the defects of unstable fusing shape and high breaking failure rate of the fuse link are overcome, and the reliability is high.
Drawings
The invention will be further explained with reference to the following embodiments:
fig. 1 is an axial cross-sectional view of an embodiment of the present invention;
FIG. 2 is a perspective exploded view of the embodiment of FIG. 1;
FIG. 3 is a schematic diagram of the embodiment of FIG. 1 in a normal state;
fig. 4 is a schematic diagram of a state in which the protection function is implemented on the basis of fig. 3.
Detailed Description
As shown in fig. 1 to 4, a schematic diagram of an embodiment of the present invention is shown. In which fig. 1 shows a schematic view in axial section, and fig. 2 is an exploded view of the main components thereof; fig. 3 and 4 show the normal operation state and the protection fuse state, respectively.
The fuse link 3 of the present embodiment is cylindrical, and two ends of the fuse link are respectively electrically connected with a pin 5; a housing is wrapped around the fuse link 3 and the connection of the pin 5 to the fuse link 3. An outer fusing cavity 11 is arranged between the outer shell and the outer wall of the fuse link 3; an inner fusing cavity 12 is formed by the pin 5 and the inner wall of the fuse link 3; both the inner fuse cavity 12 and the outer fuse cavity 11 are filled with fluxing agent 4.
The functions of the present embodiment are explained with reference to fig. 3 and 4:
in the state of fig. 3, the fuse body 3 is not at the fusing temperature and thus has a stable shape, and in this state, the lead 5 and the fuse body 3 form a good conductor path and can carry a rated current.
In the state of fig. 4, the temperature of the fuse link 3 reaches the fusing condition and changes into the fusing state, the fusing assistant agent 4 in the inner fusing cavity 12 and the outer fusing cavity 11 greatly enhances the tension of the liquid metal at the interface when the fuse link 3 is in the fusing state, so that the liquid metal is rapidly contracted towards the pin 5 to form spherical liquid drops, the fusing shape of the fuse link 3 is stable, the retracting speed is high, the rapid turn-off action of a loop is realized, and the fuse link 3 has reliable fusing characteristic.
The present embodiment also has the following features:
the joint parts of the pin 5 and the two ends of the fuse-link 3 are provided with opposite bowl-shaped openings, and the concave surfaces of the bowl-shaped openings cover and are electrically connected and fixed at the two ends of the fuse-link 3. The bowl-shaped openings with the concave ends can ensure that the fuse link 3 is stably restrained in posture when in a solid state, and the fuse link is convenient to weld and is stably connected with the fuse link; on the other hand, the fuse link 3 can provide uniform tension support when being melted, so that the liquid drop of the fuse link is uniform in shape and regular in structure, and the fuse failure is further avoided.
The lead 5 of the present embodiment is axially drawn, but is not limited to this form, and for example, radially drawn.
The outer fuse cavity 11 has a radially inwardly projecting projection 7 inside, which projection 7 grips the outer wall of the fixed fuse body 3. As can be seen particularly in fig. 2, the position of the fuse link 3 can be accurately constrained during assembly, ensuring product consistency and assembly efficiency, and on the other hand, the creepage distance of the arc when the fuse link 3 is fused is extended because the bump 7 obstructs part of the space of the outer fuse cavity 11.
The shell comprises a base 1 and a cover plate 2; the base 1 and the cover 2 are buckled to form an outer fusing cavity 11. This structure facilitates filling of the fluxing agent 4 therein.
The base 1 is provided with a glue filling cavity 6 at the pin 5 position at two sides, the glue filling cavity 6 is filled with a packaging material, and the packaging material surrounds the pin 5 in the glue filling cavity 6, so that the pin 5 and the base 1 are firmly fixed. In particular, it is considered that the cover plate 2 is covered with an encapsulating material, which integrally reinforces the strength of the housing.
The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.
Claims (7)
1. A thermal fuse, characterized by: it includes:
the fuse link is cylindrical, and two ends of the fuse link are respectively and electrically connected with a pin;
the shell is coated at the connecting positions of the fuse link and the pins with the fuse link; an outer fusing cavity is arranged between the outer shell and the outer wall of the fuse link; an inner fusing cavity is formed by the pin and the inner wall of the fuse link; wherein,
and the inner fusing cavity and the outer fusing cavity are filled with fusing assistant.
2. A thermal fuse according to claim 1, wherein: the pin and the combination part at the two ends of the fuse link are provided with opposite bowl-shaped openings, and concave surfaces of the bowl-shaped openings are respectively covered and electrically connected and fixed at the two ends of the fuse link.
3. A thermal fuse according to claim 1, wherein: the inner part of the outer fusing cavity is provided with a radially inward convex bump, and the outer wall of the fusing body is grabbed and fixed by the convex bump.
4. A thermal fuse according to claim 3, wherein: the lead-out mode of the pin comprises a radial mode and an axial mode.
5. A thermal fuse according to claim 1 or 2 or 3 or 4, wherein: the shell comprises a base and a cover plate; the base and the cover plate are buckled to form the outer fusing cavity.
6. The thermal fuse according to claim 5, wherein: the base is provided with a glue filling cavity at the pin positions on two sides respectively, and packaging materials are filled in the glue filling cavity and surround the pin parts in the glue filling cavity.
7. The thermal fuse according to claim 6, wherein: the packaging material covers the cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684695.0U CN203573925U (en) | 2013-10-31 | 2013-10-31 | Temperature fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320684695.0U CN203573925U (en) | 2013-10-31 | 2013-10-31 | Temperature fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203573925U true CN203573925U (en) | 2014-04-30 |
Family
ID=50541640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320684695.0U Expired - Lifetime CN203573925U (en) | 2013-10-31 | 2013-10-31 | Temperature fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203573925U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104599917A (en) * | 2015-02-14 | 2015-05-06 | 南京萨特科技发展有限公司 | Protecting element |
| WO2016127846A1 (en) * | 2015-02-14 | 2016-08-18 | 南京萨特科技发展有限公司 | Protecting element |
| CN106024548A (en) * | 2015-03-25 | 2016-10-12 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
| CN106057603A (en) * | 2016-09-07 | 2016-10-26 | 南京萨特科技发展有限公司 | Novel suspension surface mounting fuse |
| CN106601570A (en) * | 2017-01-10 | 2017-04-26 | 上海查尔斯电子有限公司 | Fuse |
| WO2019061252A1 (en) * | 2017-09-29 | 2019-04-04 | 电安科技嘉兴有限公司 | Fuse device, and fuse wire element thereof |
-
2013
- 2013-10-31 CN CN201320684695.0U patent/CN203573925U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104599917A (en) * | 2015-02-14 | 2015-05-06 | 南京萨特科技发展有限公司 | Protecting element |
| WO2016127846A1 (en) * | 2015-02-14 | 2016-08-18 | 南京萨特科技发展有限公司 | Protecting element |
| CN104599917B (en) * | 2015-02-14 | 2017-03-08 | 南京萨特科技发展有限公司 | A kind of protection element |
| US10388483B2 (en) | 2015-02-14 | 2019-08-20 | Nanjing Sart Science & Technology Development Co., Ltd | Protective element |
| CN106024548A (en) * | 2015-03-25 | 2016-10-12 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
| CN106057603A (en) * | 2016-09-07 | 2016-10-26 | 南京萨特科技发展有限公司 | Novel suspension surface mounting fuse |
| CN106057603B (en) * | 2016-09-07 | 2019-09-03 | 南京萨特科技发展有限公司 | A kind of hanging surface mounting fuse protector |
| CN106601570A (en) * | 2017-01-10 | 2017-04-26 | 上海查尔斯电子有限公司 | Fuse |
| WO2019061252A1 (en) * | 2017-09-29 | 2019-04-04 | 电安科技嘉兴有限公司 | Fuse device, and fuse wire element thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |