CN202049822U - Protection element - Google Patents
Protection element Download PDFInfo
- Publication number
- CN202049822U CN202049822U CN2011201380052U CN201120138005U CN202049822U CN 202049822 U CN202049822 U CN 202049822U CN 2011201380052 U CN2011201380052 U CN 2011201380052U CN 201120138005 U CN201120138005 U CN 201120138005U CN 202049822 U CN202049822 U CN 202049822U
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- CN
- China
- Prior art keywords
- pptc
- link
- thermal fuse
- protection component
- fusing point
- Prior art date
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Abstract
The utility model discloses a protection element which comprises a PPTC (parallel plate transverse electromagnetic cell) piece and a thermal fusing body, wherein the PPTC piece and the thermal fusing body are connected in series, the melting point of the thermal fusing body is higher than that of the PPTC piece, the thermal fusing body is sealed in a closed shell and a fluxing agent is coated on the surface of the thermal fusing body. In the protection element, when an electrical device has nature failures and the temperature of the electrical device or the temperature of the PPTC piece achieves the melting point of the thermal fusing body, the thermal fusing body is molten and broken fast under the action of alloy fluxing agent to be shrunk into two balls which are adhered on pins at two sides, namely, the protection element becomes a non-restorable tripping protection element, thus fundamentally cutting off current and further having the effect of being capable of avoiding safety hidden hazard of the electrical device.
Description
Technical field
The utility model relates to the circuit protection device field, relates to a kind of protection component in particular.
Background technology
Resettable fuse PPTC(Polymer Positive Temperature coefficien t; high molecular polymer positive coefficient temperature and resistance; be the high molecular positive temp thermistor) with it from recovery characteristics, be widely used in the overcurrent protection of circuit, electronic equipment.
But, for the PPTC resettable fuse of routine, when circuit voltage surpasses its rated voltage, or when repeatedly standing overload current repeatedly, or under the load short circuits situation, the PPTC element might be overheated and burn, explosion, short circuit.Therefore, particularly in the application of primary circuit (civil power) protection, significant limitation is arranged, can only do auxiliary protection, can not do final protection separately and use.So under certain particular case, still need the cut-out of non-restoring type, i.e. the cut-out of essence circuit.
In view of this, the inventor has this case to produce at the above-mentioned defective further investigation of existing protection component then.
The utility model content
The purpose of this utility model is to provide a kind of protection component, and it can cut off and the cut-out of non-restoring type with restoring type, still has the problem of potential safety hazard when running into essential fault to solve in the prior art.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of protection component wherein, comprises PPTC sheet and thermal fuse-link, and this PPTC sheet links to each other with the thermal fuse-link serial connection, and the fusing point of this thermal fuse-link is higher than the fusing point of PPTC sheet.
Further, the fusing point of this thermal fuse-link is higher 5 ℃ than the fusing point of PPTC sheet at least.
Further, this thermal fuse-link comprises two lead-in wires, low-melting alloy silks and the flux layer that is coated on low-melting alloy silk outer surface, and this low-melting alloy silk is between two lead-in wires, and the fusing point of this low-melting alloy silk is higher 5 ℃ than the fusing point of PPTC sheet at least.
Further, this thermal fuse-link also comprises shell, and this low-melting alloy silk, flux layer and two lead-in wires all are encapsulated in the shell, and these two lead-in wires then are exposed to shell, and a lead-in wire wherein links to each other with PPTC sheet serial connection.
Further, be formed with deep gouge on this PPTC sheet, this thermal fuse-link then embeds in the deep gouge that is arranged on the PPTC sheet.
Further, this thermal fuse-link is mounted on the surface of PPTC sheet.
Further, this protection component adopts epoxy resin, silicone resin, polyurethane or silicon rubber and seals and be one.
After adopting said structure, a kind of protection component that the utility model relates to, it is owing to be provided with the PPTC sheet, so when fault caused big electric current by it, PPTC sheet temperature can be elevated to " shutoff " temperature, the i.e. melting temperature of PPTC polymeric material suddenly, this PPTC sector-meeting becomes high resistance, thereby the electric current in the weakening circuit, and then the temperature of control electric device are to protect electric device as restoring type tripping protection element; And when there is essential fault in electric device; owing under the control of PPTC sheet, can't thoroughly avoid the rising of temperature; the temperature that is electric device still can rise; this moment is when arriving the fusing point of thermal fuse-link when the temperature of electric device; this thermal fuse-link then can fuse; the rated voltage that perhaps surpasses PPTC when circuit voltage; make PPTC damage; or PPTC is when standing overload current repeatedly many times; or under the load short circuits situation; the PPTC element takes place overheated and is about to burning; explosion; during short circuit; this thermal cut is known from experience fusing; the protection component that promptly makes the utility model relate to becomes non-restoring type tripping protection element, thereby fundamentally cuts off electric current, and then avoids the potential safety hazard of electric device.
Description of drawings
The front schematic view of Fig. 1 a kind of protection component first embodiment for the utility model relates to;
Fig. 2 is the reverse side schematic diagram of Fig. 1;
Fig. 3 is the cutaway view of Fig. 1;
The structural representation of Fig. 4 a kind of protection component second embodiment for the utility model relates to;
Among the figure:
21 low-melting alloy silks 22 go between
Embodiment
In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.
As shown in Figure 1 to Figure 3, relate to a kind of first embodiment of protection component 100 for the utility model shown in it, this protection component 100 comprises PPTC sheet 1 and thermal fuse-link 2, and this PPTC sheet 1 links to each other with thermal fuse-link 2 serial connections, and the fusing point of this thermal fuse-link 2 is higher than the fusing point of PPTC sheet 1; Concrete, the fusing point of this thermal fuse-link 2 is higher 5 ℃ than the fusing point of PPTC sheet 1 at least, is preferably to exceed 5 ℃～50 ℃.Like this, owing to be provided with PPTC sheet 1, so when fault causes big electric current by it, PPTC sheet temperature can be elevated to " shutoff " temperature suddenly, this PPTC sheet 1 can become high resistance, thereby the electric current in the weakening circuit, and then the temperature of control electric device are to protect electric device as restoring type tripping protection element 100; And when there is essential fault in electric device; owing under the control of PPTC sheet 1, can't thoroughly avoid the rising of temperature; perhaps under the PPTC sheet damaged condition; the temperature that is electric device still can rise; this moment, 2 of this thermal fuse-links can fuse when arriving the fusing point of thermal fuse-link 2 when the temperature of electric device, and the protection component 100 that promptly makes the utility model relate to becomes non-restoring type tripping protection element 100; thereby fundamentally cut off electric current, and then avoid the potential safety hazard of electric device.
In order to quicken the fusing of thermal fuse-link 2, this thermal fuse-link 2 comprises two lead-in wires 21, low-melting alloy silk 22 and flux layers 23, this flux layer 23 is coated on the outer surface of low- melting alloy silk 22,22 of this low-melting alloy silks are between two lead-in wires 21, the fusing point of this low-melting alloy silk 22 is higher 5 ℃ than the fusing point of PPTC sheet 1 at least, is preferably to exceed 5 ℃～50 ℃.So, under the effect of flux, this low-melting alloy silk 22 can be shrunk to spherical in flux layer 23, to reach the effect of fast cut-off circuit; This thermal fuse-link 2 also comprises shell 24, this low-melting alloy silk 22, flux layer 23 and two lead-in wires 21 all are encapsulated in the shell 24, these two 21 in lead-in wires are exposed to shell 24, and a lead-in wire 21 wherein links to each other with PPTC sheet 1 serial connection, can make 2 one-tenth all-sealed structures of whole thermal fuse-link by this shell 24, concrete, this all-sealed structure is to adopt epoxy resin, silicone resin, polyurethane or silicon rubber and seal and be one; And low-melting alloy silk surface is coated by flux, and guaranteeing like this to work long hours can be not oxidized, and performance is more stable.Concrete, in the present embodiment, this PPTC sheet 1 is formed with deep gouge 11, and 2 embeddings of this thermal fuse-link are arranged in the deep gouge 11 of PPTC sheet 1, thereby make protection component 100 can form an integral body.
As shown in Figure 4; relate to a kind of second embodiment of protection component 100 for the utility model shown in it; its structure and first embodiment are basic identical; its difference is: thermal fuse-link 2 is different with the outside connected mode of PPTC sheet 1; in the present embodiment, this thermal fuse-link 2 is mounted on the surface of PPTC sheet 1.
Need to prove that above-mentioned first embodiment and second embodiment only are two kinds of set-up modes between PPTC sheet 1 and the thermal fuse-link 2, but are not limited to this, such as the mode that can take between this PPTC sheet 1 and the thermal fuse-link 2 to separate fully.
The foregoing description and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.
Claims (7)
1. a protection component is characterized in that, comprises PPTC sheet and thermal fuse-link, and this PPTC sheet links to each other with the thermal fuse-link serial connection, and the fusing point of this thermal fuse-link is higher than the fusing point of PPTC sheet.
2. a kind of protection component as claimed in claim 1 is characterized in that, the fusing point of this thermal fuse-link is higher 5 ℃ than the fusing point of PPTC sheet at least.
3. a kind of protection component as claimed in claim 1; it is characterized in that; this thermal fuse-link comprises two lead-in wires, low-melting alloy silks and the flux layer that is coated on low-melting alloy silk outer surface; this low-melting alloy silk is between two lead-in wires, and the fusing point of this low-melting alloy silk is higher 5 ℃ than the fusing point of PPTC sheet at least.
4. a kind of protection component as claimed in claim 3; it is characterized in that this thermal fuse-link also comprises shell, this low-melting alloy silk, flux layer and two lead-in wires all are encapsulated in the shell; these two lead-in wires then are exposed to shell, and a lead-in wire wherein links to each other with PPTC sheet serial connection.
5. as each described a kind of protection component of claim 1 to 4, it is characterized in that be formed with deep gouge on this PPTC sheet, this thermal fuse-link then embeds in the deep gouge that is arranged on the PPTC sheet.
6. as each described a kind of protection component of claim 1 to 4, it is characterized in that this thermal fuse-link is mounted on the surface of PPTC sheet.
7. as each described a kind of protection component of claim 1 to 4, it is characterized in that this protection component adopts epoxy resin, silicone resin, polyurethane or silicon rubber and seals and be one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201380052U CN202049822U (en) | 2011-05-04 | 2011-05-04 | Protection element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201380052U CN202049822U (en) | 2011-05-04 | 2011-05-04 | Protection element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202049822U true CN202049822U (en) | 2011-11-23 |
Family
ID=44990122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201380052U Expired - Fee Related CN202049822U (en) | 2011-05-04 | 2011-05-04 | Protection element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202049822U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702394A (en) * | 2014-12-16 | 2016-06-22 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
| CN105702395A (en) * | 2014-12-16 | 2016-06-22 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
-
2011
- 2011-05-04 CN CN2011201380052U patent/CN202049822U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702394A (en) * | 2014-12-16 | 2016-06-22 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
| CN105702395A (en) * | 2014-12-16 | 2016-06-22 | 斯玛特电子公司 | Fuse resistor and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20200504 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |