CN103021604A - High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof - Google Patents
High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof Download PDFInfo
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- CN103021604A CN103021604A CN2012105308700A CN201210530870A CN103021604A CN 103021604 A CN103021604 A CN 103021604A CN 2012105308700 A CN2012105308700 A CN 2012105308700A CN 201210530870 A CN201210530870 A CN 201210530870A CN 103021604 A CN103021604 A CN 103021604A
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Abstract
The invention discloses a high voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and a manufacturing method thereof. The thermistor consists of a high molecular core material with high PTC characteristic and metal foil electrode layers attached to both sides of the core material. A bevel or an arc-shaped face can be formed in the periphery of a sheet attached to the metal foil electrode layers by way of cutting the sheet with tools with different tool bits in shape. The creep distance between two copper foil electrodes is longer than the original linear distance, so that the withstand voltage performance of the product is improved, the arc discharge between the electrodes is effectively reduced, and probability of abnormal situations such as breakdown and combustion is effectively reduced. The bevel or the arc-shaped face is directly cut on the high voltage resisting level high molecular PTC thermistor sheet, so that the manufacturing process is simple and meanwhile, no additional manufacturing steps are increased, the cost is lowered and the performance is improved, and the thermistors can be quickly and economically produced in a large scale.
Description
Technical field
The present invention relates generally to electronic component or the device with positive temperature coefficient resistor rate high molecular polymer, refers to especially a kind of high voltage withstand class macromolecular PTC thermistor and preparation method thereof.
Background technology
Resistance with conducing composite material of positive temperature coefficient (Positive Temperature Coefficient, PTC) characteristic has the sharp characteristic of variations in temperature reaction, has been widely used on over-current protecting element or the circuit element at present.Because the resistance of PTC conducing composite material under normal temperature can be kept utmost point low value; make the circuit can normal operation; when circuit generation super-high-current or excessive temperature; the instantaneous high-impedance state state that is elevated to of its resistance value meeting; make circuit be in a kind of approximate " open circuit " state; circuital current is limited in extremely low level, to reach the purpose of protective circuit.And after fault is got rid of, the drop in temperature of thermistor, its resistance value can return to low resistance state again.
Present overcurrent protection macromolecular thermosensitive resistor; also claim PPTC(Polymer Positive Temperature coefficient) or resettable fuse, crystalline polymer polymer (such as high density polyethylene (HDPE) etc.) usually used, conductive powder (such as carbon black etc.); filler; antioxidant, assistant crosslinking agent etc. are compounded in the core two sides with metal foil electrode behind the mixed refining process core; composite sheet is again through cutting; or stamping-out makes the chip of certain size, again through welding lead, seals and forms.This is known in the art.
There is following defective in the PPTC that utilizes existing structure design and technical matters to produce.After the PPTC action, voltage nearly all is added between two electrodes of PPTC, because the copper foil electrode close together at edge, two sides, in the higher application scenario of voltage, for example the 220V circuit just produces creepage at the PPTC chip edge sometimes easily, arcing, when electric arc is serious, produce easily the phenomenons such as puncture, burning, cause PPTC to lose efficacy.
For addressing this problem, increase the creepage distance between the copper foil electrode of two sides, publication number is the Chinese patent of CN1416142, to use the circuit board corrosion technology, etch away a circle Copper Foil at chip edge, to strengthen the creepage distance between the copper foil electrode of two sides, such method will increase several procedures, and cost increases.
And publication number is the Chinese patent of CN101315823A another kind of method is proposed, the good PPTC chip of cutting stamping-out is put into hot press heating pressurization again, so that PPTC material extrudes a bit from the edge, to reach the purpose that strengthens the creepage distance between the copper foil electrode of two sides.Doing so same existence increases operation, and efficient is low, the problem that cost increases.
Summary of the invention
The purpose of this invention is to provide a kind of high voltage withstand class macromolecular PTC thermistor and preparation method thereof, it effectively reduces arc discharge phenomenon between electrode, punctures to reduce, and has simultaneously low cost of manufacture, the characteristics of being convenient to process.
For achieving the above object, solution of the present invention is:
A kind of high voltage withstand class macromolecular PTC thermistor is made of the macromolecular material core with ptc characteristics and the metal foil electrode layer that is covered on the core two sides; Wherein: the periphery at thermistor cuts out the inclined-plane.
Described inclined-plane is to be formed slopely up and down two inclined-planes, i.e. V-type section to the metal foil electrode layer on two sides respectively with core kernel of section line.
Described up and down two inclined-planes are symmetrical or asymmetric setting.
Described up and down two inclined-planes become respectively the angle of 20-80 degree with core kernel of section line.
Described inclined-plane is with two inclined-planes about two metal foil electrode layers are formed slopely out to the core middle part respectively up and down, is formed with straight flange between two inclined-planes up and down.
A kind of method of making described high voltage withstand class macromolecular PTC thermistor, its concrete steps are:
Step 2 adopts the V-knife head to leave respectively V-shaped groove on the line of cut of sheet material two sides;
Step 3 just forms a plurality of independent high voltage withstand class macromolecular PTC thermistors for broken string with the each several part sheet separation according to V-shaped groove.
A plurality of independent high voltage withstand class macromolecular PTC thermistors are just formed the each several part sheet separation on the bottom of adopting again the vertical cut head vertically to cut V-shaped groove in the described step 3.
A kind of high voltage withstand class macromolecular PTC thermistor is made of the macromolecular material core with ptc characteristics and the metal foil electrode layer that is covered on the core two sides; Wherein: the periphery at thermistor cuts out cambered surface.
Described cambered surface is to convex into to outer arc with the core kernel of section.
Described cambered surface is up and down two cambered surfaces that form respectively concave or convex with core kernel of section line to the metal foil electrode layer on two sides.
Described up and down two cambered surfaces are symmetrical or asymmetric setting.
A kind of method of making described high voltage withstand class macromolecular PTC thermistor, its concrete steps are:
Step 2 adopts the arc cutter head to leave respectively deep-slotted chip breaker on the line of cut of sheet material two sides;
Step 3 just forms a plurality of independent high voltage withstand class macromolecular PTC thermistors for broken string with the each several part sheet separation according to the deep-slotted chip breaker center.
Arc cutter head in the described step 2 is the symmetrical or asymmetric evagination arc cutter heads in both sides.
Arc cutter head in the described step 2 is the symmetrical or asymmetric indent arc cutter heads in both sides.
After adopting such scheme, high voltage withstand class macromolecular PTC thermistor of the present invention is can form inclined-plane or cambered surface at its periphery in the mode that the sheet material that is covered with the metal foil electrode layer utilizes the cutter of difformity cutter head to cut, make the creepage distance between two copper foil electrodes longer than original air line distance, the product voltage endurance is improved, effectively reduced arc discharge phenomenon between electrode, effectively reduce and puncture the anomaly occurrence probability such as burning; And this inclined-plane or cambered surface can be utilized different cutters directly to cut on the high voltage withstand class macromolecular PTC thermistor sheet material of making and form, and therefore, it has makes simply simultaneously, do not increase extra production process, can reduce cost, improve performance, and quick and economic a large amount of productions.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention 1;
Fig. 2 is the high voltage withstand class macromolecular PTC thermistor of the present invention sheet material schematic diagram;
Fig. 3 is making schematic diagram 1 of the present invention;
Fig. 4 is making schematic diagram 2 of the present invention;
Fig. 5 is the structural representation of embodiments of the invention 2;
Fig. 6 is the structural representation of embodiments of the invention 3;
Fig. 7 is the structural representation of embodiments of the invention 4.
Embodiment
To shown in Figure 7, the present invention has disclosed a kind of high voltage withstand class macromolecular PTC thermistor 1 such as Fig. 1, and it is to be made of the macromolecular material core 11 with ptc characteristics and the metal foil electrode layer 12,13 that is covered on the core two sides; Shown in Fig. 1,5,6, key of the present invention is: the periphery at thermistor 1 cuts out the inclined-plane.
As shown in Figure 1, this inclined-plane is that core 11 kernel of section lines are formed slopely up and down two inclined-planes 121,131 to the metal foil electrode layer 12,13 on two sides respectively, namely consists of the V-type section.Cooperate shown in Fig. 2,3,4, each thermistor 1 is when making, that a sheet material 10 that is covered with the metal foil electrode layer is placed mould or anchor clamps, adopt the V-knife head, on the line of cut of sheet material two sides, all leave V-shaped groove, shown in 4 figure, after all lines of cut are all slotted, just can separately become a plurality of independent high voltage withstand class macromolecular PTC thermistors.
Because high voltage withstand class macromolecular PTC thermistor edge adopts the form on inclined-plane to be formed with protuberance, therefore, the creepage distance between the copper foil electrode of two sides is longer than original air line distance, and the product voltage endurance is improved.
The shape of this high voltage withstand class macromolecular PTC thermistor periphery can adopt different cutters to utilize above-mentioned cutting method to get final product.
As shown in Figure 4, embodiments of the invention 2, its inclined-plane is with two inclined-planes 123,133 about two metal foil electrode layers 12,13 are formed slopely out to core 11 middle parts respectively up and down, be formed with straight flange 111 between two inclined-planes 123,133 up and down, namely form a trapezoidal section, can realize lengthening equally the effect of creepage distance between the copper foil electrode of two sides.And when making, utilizing first V-knife head cutter on the line of cut of sheet material two sides, to leave respectively V-shaped groove, a plurality of independent high voltage withstand class macromolecular PTC thermistors are just formed the each several part sheet separation on the bottom of adopting again afterwards the vertical cut head vertically to cut V-shaped groove.
This states inclined-plane among the embodiment 1,2, and become the angle of 20-80 degree with core 11 center lines be best.And the angle of two inclined-planes inclination can be symmetrical or asymmetric setting up and down.
Shown in Fig. 5,6, the periphery of this thermistor can utilize the arc bit tool to cut out cambered surface for another example, can make equally the edge of core 11 protrude from two copper foil electrode layers 12,13 edge, to increase the creepage distance between the copper foil electrode of two sides.
As shown in Figure 5, embodiments of the invention 3, this cambered surface 112 is to convex into to outer arc with core 11 kernel of section, during making is to adopt the indent arc bit tool of both sides symmetry to cut.And the embodiment of the invention 4 as shown in Figure 6, this cambered surface is up and down two cambered surfaces 122,132 that form respectively concave or convex with core 11 kernel of section lines to the metal foil electrode layer 12,13 on two sides, when then making is to adopt both sides arc bit tool symmetrical or asymmetric convex or concave to cut.
In a word, high voltage withstand class macromolecular PTC thermistor of the present invention can form inclined-plane or cambered surface at its periphery by the mode that cuts, make the creepage distance between two copper foil electrodes longer than original air line distance, effectively reduced arc discharge phenomenon between electrode, effectively reduce and puncture the anomaly occurrence probability such as burning; And this inclined-plane or cambered surface can be utilized different cutters directly to cut on the high voltage withstand class macromolecular PTC thermistor sheet material of making and form, and therefore, it has makes simply simultaneously, do not increase extra production process, can reduce cost, improve performance, and quick and economic a large amount of productions.
Instantiation
The present invention is described in more detail below in conjunction with example, but the invention is not restricted to these embodiment.
HDPE, carbon black, magnesium hydroxide, crosslinking agent and other auxiliary agent were put the banbury banburying 15 minutes, took out to spend temperatures with vulcanizing press 180 and become thick 2.3 millimeters core, were clipped in the nickel-clad copper foil electrode that two single face roughenings cross, spend 180 with vulcanizing press, under the 50MPa pressure condition, copper foil electrode is compounded in the core two sides, is pressed into 2 millimeters thick PPTC sheet materials.
Cutter are worn into two oblique angles that become 45 degree with plane centreline to the circumference edge of a knife with the disk milling cutter transformation of 2 millimeters thick with cutter and tool grinding machine.
Cutter are contained on the milling machine V-type groove is opened respectively on PPTC sheet material two sides, 0.9 millimeter of groove depth, groove becomes intersecting parallels to distribute, and slot pitch is from 10 millimeters.
After finishing, break off with the fingers and thumb with have gentle hands, just obtaining length and width is the PPTC chip of 10 * 10 mm in sizes.
Chip is again through crosslinking Treatment, and welding lead is sealed, and after the heat treatment, making the normal temperature resistance value is the PPTC element of 2.5-3.5 ohm.
Comparative Examples:
Except with blanking die above-mentioned PPTC sheet material stamping-out being become 10 * 10 millimeters chip, the edge is vertical plane, and all the other are the same.
The result:
With PPTC element 240V, the 1A current trigger, energising was kept 20 seconds, cut off the power supply 100 seconds, be a circulation like this.Repeatedly carry out.
5 in embodiment sample, 6000 circulations are all intact afterwards, do not burn, and split generation.
5 of comparative example have checked after 100 circulations that 2 burn out from edge breakdown, and 500 rear inspections of circulation have again 2 edge breakdowns to burn out, and check after 1000 circulations that last 1 edge breakdown burns out.
Claims (14)
1. one kind high voltage withstand class macromolecular PTC thermistor is made of the macromolecular material core with ptc characteristics and the metal foil electrode layer that is covered on the core two sides; It is characterized in that: the periphery at thermistor cuts out the inclined-plane.
2. high voltage withstand class macromolecular PTC thermistor as claimed in claim 1 is characterized in that: described inclined-plane is to be formed slopely up and down two inclined-planes, i.e. V-type section to the metal foil electrode layer on two sides respectively with core kernel of section line.
3. high voltage withstand class macromolecular PTC thermistor as claimed in claim 2 is characterized in that: described up and down two inclined-planes are symmetrical or asymmetric setting.
4. high voltage withstand class macromolecular PTC thermistor as claimed in claim 2 or claim 3, it is characterized in that: described up and down two inclined-planes become respectively the angle of 20-80 degree with core kernel of section line.
5. high voltage withstand class macromolecular PTC thermistor as claimed in claim 1 is characterized in that: described inclined-plane is to be formed slopely out up and down two inclined-planes to the core middle part respectively with two metal foil electrode layers up and down, is formed with straight flange between two inclined-planes up and down.
6. a making is such as the method for high voltage withstand class macromolecular PTC thermistor as described in the claim 1,2,3,4 or 5, and its concrete steps are:
Step 1 places the sheet material that is covered with the metal foil electrode layer on mould or the anchor clamps;
Step 2 adopts the V-knife head to leave respectively V-shaped groove on the line of cut of sheet material two sides;
Step 3 just forms a plurality of independent high voltage withstand class macromolecular PTC thermistors for broken string with the each several part sheet separation according to V-shaped groove.
7. high voltage withstand class macromolecular PTC thermistor manufacture method as claimed in claim 6 is characterized in that: a plurality of independent high voltage withstand class macromolecular PTC thermistors are just formed the each several part sheet separation on the bottom of adopting again the vertical cut head vertically to cut V-shaped groove in the described step 3.
8. one kind high voltage withstand class macromolecular PTC thermistor is made of the macromolecular material core with ptc characteristics and the metal foil electrode layer that is covered on the core two sides; It is characterized in that: the periphery at thermistor cuts out cambered surface.
9. high voltage withstand class macromolecular PTC thermistor as claimed in claim 1, it is characterized in that: described cambered surface is to convex into to outer arc with the core kernel of section.
10. high voltage withstand class macromolecular PTC thermistor as claimed in claim 1 is characterized in that: described cambered surface is up and down two cambered surfaces that form respectively concave or convex with core kernel of section line to the metal foil electrode layer on two sides.
11. high voltage withstand class macromolecular PTC thermistor as claimed in claim 10 is characterized in that: described up and down two cambered surfaces are symmetrical or asymmetric setting.
12. the method for a making such as claim 8,9,10 or 11 described high voltage withstand class macromolecular PTC thermistors, its concrete steps are:
Step 1 places the sheet material that is covered with the metal foil electrode layer on mould or the anchor clamps;
Step 2 adopts the arc cutter head to leave respectively deep-slotted chip breaker on the line of cut of sheet material two sides;
Step 3 just forms a plurality of independent high voltage withstand class macromolecular PTC thermistors for broken string with the each several part sheet separation according to the deep-slotted chip breaker center.
13. high voltage withstand class macromolecular PTC thermistor manufacture method as claimed in claim 12 is characterized in that: the arc cutter head in the described step 2 is the symmetrical or asymmetric evagination arc cutter heads in both sides.
14. high voltage withstand class macromolecular PTC thermistor manufacture method as claimed in claim 12 is characterized in that: the arc cutter head in the described step 2 is the symmetrical or asymmetric indent arc cutter heads in both sides.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105308700A CN103021604A (en) | 2012-12-11 | 2012-12-11 | High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof |
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| CN2012105308700A CN103021604A (en) | 2012-12-11 | 2012-12-11 | High voltage resisting level high molecular PTC (Positive Temperature Coefficient) thermistor and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047338A (en) * | 2015-08-20 | 2015-11-11 | 国家电网公司 | Zinc oxide resistor disc with high side flashover voltage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05109465A (en) * | 1991-10-18 | 1993-04-30 | Matsushita Electric Ind Co Ltd | Positive-resistance temperature coefficient heating element and manufacture thereof |
| CN1416142A (en) * | 2002-11-19 | 2003-05-07 | 上海维安热电材料股份有限公司 | High molecular PTC thermistor without electric arc and method for producing same |
| CN200965820Y (en) * | 2006-10-24 | 2007-10-24 | 谭勇 | Dry-type transformer umbrella type insulation shim |
| CN101315823A (en) * | 2007-06-01 | 2008-12-03 | 聚鼎科技股份有限公司 | Production method of overcurrent production element |
| CN203134491U (en) * | 2012-12-11 | 2013-08-14 | 厦门莱纳电子有限公司 | High-dielectric-strength macromolecule PTC (positive temperature coefficient) thermistor |
-
2012
- 2012-12-11 CN CN2012105308700A patent/CN103021604A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05109465A (en) * | 1991-10-18 | 1993-04-30 | Matsushita Electric Ind Co Ltd | Positive-resistance temperature coefficient heating element and manufacture thereof |
| CN1416142A (en) * | 2002-11-19 | 2003-05-07 | 上海维安热电材料股份有限公司 | High molecular PTC thermistor without electric arc and method for producing same |
| CN200965820Y (en) * | 2006-10-24 | 2007-10-24 | 谭勇 | Dry-type transformer umbrella type insulation shim |
| CN101315823A (en) * | 2007-06-01 | 2008-12-03 | 聚鼎科技股份有限公司 | Production method of overcurrent production element |
| CN203134491U (en) * | 2012-12-11 | 2013-08-14 | 厦门莱纳电子有限公司 | High-dielectric-strength macromolecule PTC (positive temperature coefficient) thermistor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047338A (en) * | 2015-08-20 | 2015-11-11 | 国家电网公司 | Zinc oxide resistor disc with high side flashover voltage |
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Application publication date: 20130403 |