CN102881513A - Thermostable aging-resistant thermal cutoff and manufacturing method thereof - Google Patents
Thermostable aging-resistant thermal cutoff and manufacturing method thereof Download PDFInfo
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- CN102881513A CN102881513A CN201210372890XA CN201210372890A CN102881513A CN 102881513 A CN102881513 A CN 102881513A CN 201210372890X A CN201210372890X A CN 201210372890XA CN 201210372890 A CN201210372890 A CN 201210372890A CN 102881513 A CN102881513 A CN 102881513A
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Abstract
Disclosed is a thermostable aging-resistant thermal cutoff and a manufacturing method thereof. The manufacturing method includes: drawing low-melting-point alloy into a thin filament and cutting the same according to a required length; respectively welding two ends of each cut fusible alloy filament on two metal wire pins, and coating a layer of fluxing agent on the surface of the fusible alloy filament; mounting the fusible alloy filament coated with the fluxing agent and one end of each metal wire pins in a plastic casing, and then sealing an opening of the plastic casing by epoxy resin and completely curing the epoxy resin; and coating and curing the outer surface of the plastic casing of a component with a layer of insulating coating, and then manufacturing the same into a thermal cutoff element. Due to the fact that a layer of thin insulating film is dipcoated outside the plastic casing, permeability of oxygen to the interior of a product under high temperature can be effectively avoided, requirements of long service life of the thermostable aging-resistant thermal cutoff are met, various requirements of a novel edition of IEC (international electrotechnical commission) standard and national standard GB9816-2008 are met, and the thermostable aging-resistant thermal cutoff has the advantages of low cost and easiness in processing.
Description
Technical field
The present invention relates to the thermal protector technical field, refer to especially a kind of thermal fuse-link and manufacture method thereof of heat resistant.
Background technology
The alloy type thermal fusing body (THERMAL-LINKS) that breaks also claims Thermal Cutoffs, is widely used in the overheated overtemperature prote of electrical equipment and assembly thereof.Operation principle is, when temperature is elevated to the fusing point of low-melting alloy silk, and melting alloy wire, and under the help of flux, be shrunk to spherical being attached on the pin, circuit is disconnected.
Now the structure of the plastic casing type thermal fuse-link on the market is to be coated with and to be covered with flux being welded in two fusible alloy silks on the parallel metal wire pin, is contained in the plastic casing shell oral area epoxy sealing.Present normally used sheathing material has thermoplastic polyester plastic such as PBT(polybutylene terephthalate (PBT)), the PET(PETG), PC (Merlon), also has nylon, the PPS(polyphenylene sulfide), bakelite etc., but have following problem:
1. thermoplastic polyester plastic, such as PBT, PET, the PC material is done the thermal fuse-link of shell, though cost is lower, handling ease, but the heat resistant ability is relatively poor, and product is 130 ℃ of lower wearing out 200 hours, or 120 ℃ lower 400 hours, thermal fuse-link can not move under given rated function temperature with regard to complete failure.Reason is that this class plastic casing can not stop that at high temperature extraneous oxygen slowly penetrates into enclosure, causes the flux of the inside at high temperature to contact with oxygen and oxidation deactivation gradually.
2. though the thermal fuse-link heat resistant better performances made of nylon outer shell, 130 ℃ of product abilities did not lose efficacy in aging 1000 hours.But after thermal fuse-link standard IEC 60691 correcting in 2006 revise 1 to the IEC60691 third edition, and CNS GB9816 " requirement of thermal fuse-link and application guide rule " is after correcting in 2008 is GB9816-2008, the thermal fuse-link of nylon outer shell can not meet the highest threshold temperature test request of new edition standard, requirement according to the new edition standard, thermal fuse-link will be done the electrical strength test under the highest threshold temperature environment, comprise and apply one minute withstand voltage test of 2*Ur+1000V voltage between live part and the shell, because nylon material insulation resistance under hot conditions sharply descends, doing the withstand voltage test shell under limiting temperature can be breakdown.
3. the thermal fuse-link of PPS or bakelite shell, though the heat resistant performance is good, have following shortcoming: 1. material is more crisp, pliability is poor, the easy explosion of shell when doing the breaking current test.2. cost is high, the processing and forming difficulty, and fraction defective is high.
Summary of the invention
Purpose of the present invention solves PBT exactly, the shortcoming of thermoplastic polyester plastic's shell thermal fuse-link loss of properties on agings such as PET, and provide a kind of maintenance cost lower, handling ease, also have simultaneously the shell pliability good, the breaking current ability of product is thermal fuse-link and the manufacture method thereof of heat resistant preferably.
For achieving the above object, solution of the present invention is:
A kind of thermal fuse-link of heat resistant, it comprises shell, fusible alloy silk and two wires pins, weld with two wires pins respectively at the two ends of fusible alloy silk, coat flux at fusible alloy silk and weld, and together place in the plastic casing, the opening part of plastic casing is by epoxy sealing, wherein: be coated with one deck insulating coating again on the outer surface of plastic casing, and solidify insulating coating.
The material of described insulating coating is high-molecular organic material curable in room temperature or high temperature.
The material of described insulating coating is one or both and above combination of liquid silastic, epoxy resin, powdered epoxy resin.
Described silicon rubber is for adopting the following one pack system of viscosity 10000 Pa. s or the liquid silastic of two components.
Described epoxy resin is bicomponent epoxy resin.
Described powdered epoxy resin is intermediate temperature setting powdered epoxy resin or low-temperature setting powdered epoxy resin, and wherein the curing temperature of intermediate temperature setting powder is 120 ℃-150 ℃, and the curing temperature of low-temperature setting powder is 70 ℃-120 ℃.
A kind of manufacture method of thermal fuse-link of heat resistant, its concrete steps are:
Step 1, at first low-melting alloy is pulled into filament, be cut into Len req;
The plastic casing outer surface of step 4, handle component is namely made the thermal fuse-link element after applying one deck insulating coating.
Described step 4 is that the plastic casing outer surface of handle component immerses in the silica gel and films, and after solidifying, namely makes the thermal fuse-link element.
The film layer material is bicomponent epoxy resin in the described step 4, and epoxy resin host and curing agent are stirred, and the plastic casing outer surface of handle component immerses films, and after the curing, namely makes the thermal fuse-link element.
Film layer material in the described step 4 is powdered epoxy resin, and the plastic casing outer surface is immersed in the powdered epoxy resin, makes the surface be stained with one deck powdered epoxy resin, after being heating and curing, namely makes the thermal fuse-link element.
Film layer material in the described step 4 is powdered epoxy resin, adopts Electrostatic Treatment, and the plastic casing outer surface is immersed in the powdered epoxy resin, utilize Electrostatic Absorption, make case surface be stained with one deck powdered epoxy resin, after being heating and curing, namely make the thermal fuse-link element.
Film layer material in the described step 4 is powdered epoxy resin, handle component is preheating to first the following temperature of thermal fuse-link temperature-sensitive low-melting alloy silk fusing point, then the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, after being heating and curing, namely make the thermal fuse-link element.
A kind of manufacture method of thermal fuse-link of heat resistant, its concrete steps are:
Step 1, at first the plastic casing outer surface is applied one deck insulating coating;
Step 4, an end of fusible alloy silk in the step 3 put into be coated with in the plastic casing of insulating coating, and at fusible alloy silk surface coating one deck flux, then with epoxy resin the opening of plastic casing is sealed and allow epoxy resin solidify fully, namely make the thermal fuse-link element.
Described step 1 is 1 plastic casing outer surface to be immersed in the silica gel film, and solidifies.
The film layer material is bicomponent epoxy resin in the described step 1, and epoxy resin host and curing agent are stirred, and the plastic casing outer surface is immersed film, and solidifies.
Film layer material in the described step 1 is powdered epoxy resin, and the plastic casing outer surface is immersed in the powdered epoxy resin, makes the surface be stained with one deck powdered epoxy resin, then is heating and curing.
Film layer material in the described step 1 is powdered epoxy resin, adopts Electrostatic Treatment, and the plastic casing outer surface is immersed in the powdered epoxy resin, utilizes Electrostatic Absorption, makes case surface be stained with one deck powdered epoxy resin, then is heating and curing.
Film layer material in the described step 1 is powdered epoxy resin, and plastic casing is placed first 120 ℃ of following temperature environment preheatings, then the plastic casing outer surface is immersed in the powdered epoxy resin, makes the surface be stained with one deck powdered epoxy resin, then is heating and curing.
After adopting such scheme, the thermal fuse-link of heat resistant of the present invention is by again dip-coating skim dielectric film outside plastic casing, just can effectively avoid under the hot conditions oxygen to the infiltration of interiors of products, satisfied the long-time high temperature ageing life requirements of thermal fuse-link, and the requirements of new edition IEC standard and GB, keep simultaneously cost lower, the advantage of handling ease.
Description of drawings
Fig. 1 is the partial structurtes cutaway view of thermal fuse-link of the present invention;
Fig. 2 is the partial front elevation view of thermal fuse-link of the present invention;
Fig. 3 is the partial side view of thermal fuse-link of the present invention.
Embodiment
Cooperate Fig. 1 to shown in Figure 3, the present invention has disclosed a kind of thermal fuse-link of heat resistant, it comprises shell 2, the fusible alloy silk 4 of given fusing point and two wires pins 5, the fusing point of fusible alloy silk can be arbitrary temperature spot from 70 ℃ to 155 ℃ according to the product specification needs, metal wire can be tinned wird, silver-coated copper wire, CP wire etc., weld with two wires pins 5 respectively at the two ends of fusible alloy silk 4, coat flux 6 at fusible alloy silk 4 and weld, and together place in the plastic casing 2, the opening part of plastic casing 2 is sealed by epoxy resin 3, and is coated with one deck insulating coating 1 on the outer surface of plastic casing 2 again.
The material of this one deck insulating coating 1 is high-molecular organic material curable in room temperature or high temperature, can be silicon rubber, epoxy resin, one or both of powder epoxy material and above combination, wherein: silicon rubber can adopt the following one pack system of viscosity 10000 Pa. s or the liquid silastic of two components; Epoxy resin adopts bicomponent epoxy resin; Powdered epoxy resin can adopt intermediate temperature setting powdered epoxy resin (120 ℃-150 ℃ of curing temperatures), or low-temperature setting powdered epoxy resin (curing temperature 70-120 ℃).
The concrete manufacture method of the thermal fuse-link of this heat resistant is:
Step 1, at first low-melting alloy is pulled into filament, be cut into Len req;
In step 3, the end threading plastic casing 2 with fusible alloy silk 4 in the step 2 and two wires pins 5, and coat flux 6 on fusible alloy silk and solder joint surface, then with epoxy resin 3 opening of plastic casing 2 is sealed and allow epoxy resin 3 solidify fully;
Certainly, dip-coating insulation layer 1 can be to carry out after the element assembling sealing, also can assemble after the dip-coating processing in advance by plastic casing 1 again.
Then the concrete manufacture method of the thermal fuse-link of this heat resistant is:
Step 1, at first plastic casing 2 outer surfaces are applied one deck insulating coating 1;
Step 4, an end of fusible alloy silk 4 in the step 3 and two wires pins 5 put into be coated with in the plastic casing 2 of insulating coating 1, and at fusible alloy silk and solder joint surface coating flux 6, then with epoxy resin 3 opening of plastic casing 2 is sealed and allow epoxy resin 3 solidify fully, namely make the thermal fuse-link element.
Specific embodiment:
The present invention is described in more detail below in conjunction with example, but the invention is not restricted to these embodiment.
Example 1:
Be that the low-melting alloy of 58% bismuth, 42% tin pulls into the filament that diameter is 0.6mm with composition, be cut into 5mm long, two is welded on respectively on two tinned wirds, then put in the plastic casing, the plastic casing material is fiber glass reinforced PBT, coat one deck flux on fusible alloy silk and solder joint surface, the flux composition is modified rosin and a small amount of activating agent, then with epoxy resin the opening of plastic casing is sealed and allows epoxy resin solidify fully.The plastic casing outer surface of handle component immerses in the silica gel (Beijing Kehua New Material Science and Technology Co.,Ltd.'s productions) of model KHK-1 films, and through 120 ℃ of curing 4 hours, namely makes fusing-off temperature and be 140 ± 2 ℃ thermal fuse-link element.
Example 2:
With example 1, but the film layer material changes bicomponent epoxy resin into, and model is that 901A/B(Boluo County high-strength composite material Co., Ltd produces).Epoxy resin host and curing agent are stirred in proportion, and the plastic casing outer surface of handle component immerses films, and 140 ± 2 ℃ thermal fuse-link element is namely made fusing-off temperature and is in cold curing 24 hours.
Example 3
With example 1, but the film layer material changes powdered epoxy resin into, model is EF-150 (B) (Tianjin Kaihua Insulation Materials Co., Ltd.'s production), 70 ℃ of handle component elder generation preheatings, then the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, put into 110 ℃ of insulating boxs and solidified 2 hours, namely make fusing-off temperature and be 140 ± 2 ℃ thermal fuse-link element.
Certainly, when the film layer material was powdered epoxy resin, plastic casing can at room temperature immerse in the powdered epoxy resin, and immerse several times can make its surface be stained with one deck powdered epoxy resin equally; After carrying out Electrostatic Treatment also or with plastic casing or powdered epoxy resin, can make equally powdered epoxy resin be attached on the plastic casing surface.
Example 4
With example 1, but the plastic casing material changes PET into.
Comparative Examples 1:
With example 1, but do not have dip-coating silica gel.
Comparative Examples 2:
With example 1, but the plastic casing material is PET, does not have dip-coating silica gel.
Test:
Above-mentioned sample is put into respectively thermostatic oil bath, and oil sump temperature heats up from the speed of room temperature with 1 ℃ of per minute, with ohmmeter test sample break-make, when sample fuses, records fusing-off temperature.
15 in every group of sample wherein tested first fusing-off temperature for 5, puts into 130 ℃ air aging 400 and after 1000 hours, each takes out 5 test fusing-off temperatures for all the other 10.
| ? | Fusing-off temperature when unaged | 130 ℃ of environmental agings fusing-off temperature after 400 hours | 130 ℃ of environmental agings fusing-off temperature after 1000 hours |
| Example 1 | 139℃ | 140℃ | 140℃ |
| Example 2 | 139℃ | 140℃ | 141℃ |
| Example 3 | 139℃ | 140℃ | 140℃ |
| Example 4 | 139℃ | 140℃ | 141℃ |
| Comparative Examples 1 | 139℃ | 160 ℃ also do not fuse | - |
| Comparative Examples 2 | 139℃ | 160 ℃ also do not fuse | - |
The result shows, behind high temperature ageing, property retention and does not have the sample of dip-coating in specification limit, lost efficacy through the sample of dip-coating insulation film.
Claims (18)
1. the thermal fuse-link of a heat resistant, it comprises shell, fusible alloy silk and two wires pins, weld with two wires pins respectively at the two ends of fusible alloy silk, coat flux at fusible alloy silk and weld, and together place in the plastic casing, the opening part of plastic casing be is characterized in that by epoxy sealing: apply on the outer surface of plastic casing again and solidify one deck insulating coating.
2. the thermal fuse-link of a kind of heat resistant as claimed in claim 1, it is characterized in that: the material of described insulating coating is high-molecular organic material curable in room temperature or high temperature.
3. the thermal fuse-link of a kind of heat resistant as claimed in claim 1 is characterized in that: the material of described insulating coating is one or both and above combination of liquid silastic, epoxy resin, powdered epoxy resin.
4. the thermal fuse-link of a kind of heat resistant as claimed in claim 1 is characterized in that: described silicon rubber is for adopting the following one pack system of viscosity 10000 Pa. s or the liquid silastic of two components.
5. the thermal fuse-link of a kind of heat resistant as claimed in claim 1, it is characterized in that: described epoxy resin is bicomponent epoxy resin.
6. the thermal fuse-link of a kind of heat resistant as claimed in claim 1, it is characterized in that: described powdered epoxy resin is intermediate temperature setting powdered epoxy resin or low-temperature setting powdered epoxy resin, wherein the curing temperature of intermediate temperature setting powdered epoxy resin is 120 ℃-150 ℃, and the curing temperature of temperature curing epoxy low toner is 70 ℃-120 ℃.
7. the manufacture method of the thermal fuse-link of a heat resistant, its concrete steps are:
Step 1, at first low-melting alloy is pulled into filament, be cut into Len req;
Step 2, two of the fusible alloy silk that cuts out is welded on respectively on the two wires pins;
Step 3, fusible alloy silk one end in the step 2 is put in the plastic casing, and coated one deck flux on fusible alloy silk surface, then with epoxy resin the opening of plastic casing is sealed and allow epoxy resin solidify fully;
The plastic casing outer surface of step 4, handle component is namely made the thermal fuse-link element after applying one deck insulating coating.
8. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 7 is characterized in that: described step 4 is that the plastic casing outer surface of handle component immerses in the silica gel and films, and after the curing, namely makes the thermal fuse-link element.
9. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 7, it is characterized in that: the film layer material is bicomponent epoxy resin in the described step 4, epoxy resin host and curing agent are stirred in proportion, the plastic casing outer surface of handle component immerses films, after the curing, namely make the thermal fuse-link element.
10. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 7, it is characterized in that: the film layer material in the described step 4 is powdered epoxy resin, the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, after being heating and curing, namely make the thermal fuse-link element.
11. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 7, it is characterized in that: the film layer material in the described step 4 is powdered epoxy resin, adopt Electrostatic Treatment, the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, after being heating and curing, namely make the thermal fuse-link element.
12. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 7, it is characterized in that: the film layer material in the described step 4 is powdered epoxy resin, handle component is preheating to first the following temperature of thermal fuse-link temperature-sensitive low-melting alloy silk fusing point, then the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, after being heating and curing, namely make the thermal fuse-link element.
13. the manufacture method of the thermal fuse-link of a heat resistant, its concrete steps are:
Step 1, at first the plastic casing outer surface is applied one deck insulating coating;
Step 2, low-melting alloy is pulled into filament, be cut into Len req;
Step 3, two of the fusible alloy silk that cuts out is welded on respectively on the two wires pins;
Step 4, an end of fusible alloy silk in the step 3 put into be coated with in the plastic casing of insulating coating, and at fusible alloy silk surface coating one deck flux, then with epoxy resin the opening of plastic casing is sealed and allow epoxy resin solidify fully, namely make the thermal fuse-link element.
14. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 13 is characterized in that: described step 1 is 1 plastic casing outer surface to be immersed in the silica gel film, and solidifies.
15. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 13, it is characterized in that: the film layer material is bicomponent epoxy resin in the described step 1, epoxy resin host and curing agent are stirred in proportion, the plastic casing outer surface is immersed film, solidify.
16. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 13, it is characterized in that: the film layer material in the described step 1 is powdered epoxy resin, the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, then be heating and curing.
17. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 13, it is characterized in that: the film layer material in the described step 1 is powdered epoxy resin, adopt Electrostatic Treatment, the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, then be heating and curing.
18. the manufacture method of the thermal fuse-link of a kind of heat resistant as claimed in claim 13, it is characterized in that: the film layer material in the described step 1 is powdered epoxy resin, plastic casing is placed first 120 ℃ of following temperature environment preheatings, then the plastic casing outer surface is immersed in the powdered epoxy resin, make the surface be stained with one deck powdered epoxy resin, then be heating and curing.
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| CN201210372890.XA CN102881513B (en) | 2012-09-29 | 2012-09-29 | Thermostable aging-resistant thermal cutoff and manufacturing method thereof |
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| CN201210372890.XA CN102881513B (en) | 2012-09-29 | 2012-09-29 | Thermostable aging-resistant thermal cutoff and manufacturing method thereof |
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| CN102881513A true CN102881513A (en) | 2013-01-16 |
| CN102881513B CN102881513B (en) | 2015-04-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161273A (en) * | 1993-12-10 | 1995-06-23 | Nec Kansai Ltd | Manufacture of thermal fuse |
| JP2004172054A (en) * | 2002-11-22 | 2004-06-17 | Nec Schott Components Corp | Thermal fuse having insulating film |
| JP2005203312A (en) * | 2004-01-19 | 2005-07-28 | Hokuriku Electric Ind Co Ltd | Resistor with fuse and its manufacturing method |
| CN201956279U (en) * | 2010-12-29 | 2011-08-31 | 徐周 | Thermal fuse |
| CN202839462U (en) * | 2012-09-29 | 2013-03-27 | 厦门莱纳电子有限公司 | High temperature resisting and aging resisting thermal-link |
-
2012
- 2012-09-29 CN CN201210372890.XA patent/CN102881513B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07161273A (en) * | 1993-12-10 | 1995-06-23 | Nec Kansai Ltd | Manufacture of thermal fuse |
| JP2004172054A (en) * | 2002-11-22 | 2004-06-17 | Nec Schott Components Corp | Thermal fuse having insulating film |
| JP2005203312A (en) * | 2004-01-19 | 2005-07-28 | Hokuriku Electric Ind Co Ltd | Resistor with fuse and its manufacturing method |
| CN201956279U (en) * | 2010-12-29 | 2011-08-31 | 徐周 | Thermal fuse |
| CN202839462U (en) * | 2012-09-29 | 2013-03-27 | 厦门莱纳电子有限公司 | High temperature resisting and aging resisting thermal-link |
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| CN102881513B (en) | 2015-04-08 |
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