CN100464378C - A piezoresistor having arc-extinguishing and flame-proofing function - Google Patents
A piezoresistor having arc-extinguishing and flame-proofing function Download PDFInfo
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- CN100464378C CN100464378C CNB2004100452128A CN200410045212A CN100464378C CN 100464378 C CN100464378 C CN 100464378C CN B2004100452128 A CNB2004100452128 A CN B2004100452128A CN 200410045212 A CN200410045212 A CN 200410045212A CN 100464378 C CN100464378 C CN 100464378C
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- insulation
- piezo
- main body
- powder
- insulation shell
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- 238000009413 insulation Methods 0.000 claims abstract description 73
- 239000000843 powder Substances 0.000 claims abstract description 36
- 238000000605 extraction Methods 0.000 claims description 19
- 239000011148 porous material Substances 0.000 claims description 19
- 239000000919 ceramic Substances 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 230000004308 accommodation Effects 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000010891 electric arc Methods 0.000 abstract description 7
- 229910052573 porcelain Inorganic materials 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 206010020843 Hyperthermia Diseases 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 230000036031 hyperthermia Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
A piezoresistor having arc-extinguishing and flame-proofing function has an insulation housing and a piezoresistor main body encapsulated in the insulation housing. It is characterized in that a space is between the inner wall of the insulation housing and the outer wall of the piezoresistor main body and forms a powder accommodating cavity. The powder accommodating cavity is filled with insulation non-inflammable powder and forms an insulation non-inflammable powder layer enclosed by the piezoresistor main body. The technology scheme of the invention is simple and effective; it solves the technology difficult problem existing in piezoresistor manufacture field for long time, the manufacturing cost for the product is increased a little; it can effectively prevent the electric appliance burning accidents caused by arc discharge, relieve the transmission of the high heat to the outer shell, and alleviate the destroy generated by porcelain body explosion, and can be used with the existing circuit plate conveniently by user.
Description
Technical field
The present invention relates to a kind of varistor.
Background technology
Varistor is widely used in the various electronic equipments as a kind of surge protection element, in use finds, when extraneous surge energy surpassed the tolerance of piezo-resistance, piezo-resistance can breakdown short circuit.In side circuit, piezo-resistance is connected across between the live wire and zero line of power supply often, transient energy is very big during short circuit, the punch through damage place can produce localized hyperthermia, the insulation and moisture that voltage-sensitive ceramic substrate outside may be wrapped up in envelope be wrapped up in seal (being main material with organic materials such as epoxy resin usually) and ignite, and might cause electric equipment such as air-conditioning on fire when serious.
At this potential safety hazard, there have been some technical measures to be used to prevent the generation of accident on fire.For example, China's utility application once disclosed a kind of safe type piezoresistor No. 00237913.9, this product characteristics is to be provided with and can carries out heat conducting Temperature protection with piezo-resistance, piezo-resistance and Temperature protection with the heat-conduction medium mutually insulated be encapsulated in the same housing.In the course of work of this product, if that piezo-resistance is heated up is too high because of improper factor, place the Temperature protection on piezo-resistance next door will be, thereby prevent because of the too high accidents such as fire that take place of piezo-resistance intensification because of the heat conduction fusing that heats up.But, find that in actual applications the response speed as the Temperature protection of overtemperature protection structure in the said goods is slow partially, is unfavorable for implementing steadily protection; Simultaneously, the ability of Temperature protection tolerance heavy current impact a little less than, lost efficacy easily in the back that is hit.Therefore, above-mentioned existing product exists defective.And for example; the applicant once disclosed a kind of hot protection type varistor in Chinese utility model patent ZL02222055.0 number; this varistor is provided with metal spring and third electrode especially; simultaneously; on piezo-resistance, have with the voltage-sensitive ceramic substrate one in the metal heat-conducting body that is conducted of electrode; one end of described metal spring welds with this metal heat-conducting body mutually through low-melting-point metal; the other end of metal spring is fixed on the housing and with the third electrode conduction and is connected, and third electrode has the exit that extends to outside the housing.When using this hot protection type varistor, third electrode can be connected with a utmost point of external power, be not connected with external power source and do not convey the extraction electrode that this third electrode is conducted.Like this, must flow through third electrode and metal spring of the electric current that provides of external power could arrive the ceramic substrate of piezo-resistance.When intensification under the influence of piezo-resistance at abnormal factors was too high, the metal heat-conducting body on the piezo-resistance will promptly conduct to heat the pad of metal spring, made low-melting weld metal fusing, and then made metal spring throw off pad.Metal spring is thrown off after the pad, the ceramic substrate of piezo-resistance outage cooling, the corresponding generation that prevents accidents such as fire.This product has anti-flaming preferably effect, obtained the approval in market, but because the structure of product is than common varistor complexity, manufacturing cost is corresponding higher, simultaneously, the third electrode of setting up needs the user to change circuit board could to adapt to it, influence its promoting the use of in part market.That is to say, for the such electronic component of varistor, the user not merely requires it to have preferable performance, wish also that simultaneously it has the versatility that adapts with the available circuit plate and lower selling price, and product to have the prerequisite of low price be to have lower manufacturing cost.Therefore, how increase under the prerequisite of manufacturing cost of product on little amplitude ground, allow varistor both have anti-flaming performance, can adapt with the existing conventional board design again, but this is actually one and seems the long-standing technical barrier that simply is difficult to solve.
Summary of the invention
Purpose of the present invention promptly is that the structure of existing varistor is improved, and provides a kind of cost lower, but burning is on fire can prevent puncture short effectively the time, and the varistor that can adapt with the existing conventional board design.
For this reason, we study structure, reason of fire and the solution of existing varistor.By a large amount of experiments, we find: the damage of piezo-resistance is on fire all to be the moments that occur in its breakdown short circuit, the arc discharge that produce this moment has caused localized hyperthermia, and then the organic materials such as epoxy resin in the seal are wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed of having ignited.Though in seal is wrapped up in insulation, be added with fire retardant usually,, still can not avoid producing naked light fully because temperature is too high.
Based on the above-mentioned research to reason of fire, we think, if there is incombustible material to suppress arc discharge when the piezo-resistance puncture short, destroy burning condition on fire, just can play fire-retardant effect.This is because as long as restrained arc discharge in the moment of the breakdown short circuit of piezo-resistance, do not make it produce naked light, so, short circuit current will make the protective tube in the electric equipment products fuse in the extremely short time, cut off the electricity supply, and just can not cause big infringements such as fire.
According to this thinking, we have proposed a kind of like this technical scheme: the piezo-resistance main body is packed in the insulation shell, and powder (i.e. insulation and the aphlogistic material powder) layer of between the outer wall of the inwall of insulation shell and piezo-resistance main body, filling insulation and not firing, utilize this powder bed that the piezo-resistance main body is wrapped up one deck again, realize inhibition arc discharge.
Specifically: varistor of the present invention has insulation shell and is encapsulated in the interior piezo-resistance main body of insulation shell, described piezo-resistance main body is by the voltage-sensitive ceramic substrate and seal is wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed constituted, be provided with the interior electrode of two separation on the surface of described voltage-sensitive ceramic substrate, on the piezo-resistance main body, be connected with first extraction electrode and second extraction electrode, one end of described first extraction electrode and second extraction electrode is connected with two interior electrodes conduct of described voltage-sensitive ceramic substrate surface respectively, the other end of described first extraction electrode and second extraction electrode passes insulation and wraps up in seal and extend to outside the insulation shell, it is characterized in that having the gap and constituting powder accommodation cavity between the outer wall of the inwall of described insulation shell and piezo-resistance main body, in described powder accommodation cavity, be filled with insulation and do not fire powder and constitute powder bed is not fired in the insulation of piezo-resistance main body parcel.
In the present invention, it is less usually that the particle diameter of powder is not fired in said insulation, in fact, also it can be referred to as insulation and not fire particle.Above-mentioned insulation with piezo-resistance main body parcel do not fire powder bed can by quartz sand or mica powder, alumina powder, flake asbestos etc. have insulation and noninflammability can other dusty material constitute, this insulation is not fired powder bed and is had following several effect:
(1), suppresses the arc discharge of transcient short circuit time.Because the piezo-resistance main body is covered by insulation and does not fire in the powder bed, reduced and the contacting of air, the phenomenon of air ionization arcing is at high temperature greatly reduced, played the effect of arc extinguishing.
(2), when the piezo-resistance short circuit punctures, the phenomenon that bursts with porcelain body sometimes, scorching hot porcelain body fragment can disperse everywhere, causes bigger infringement.After adopting this programme, do not fill with powder or the thicker fine sand form of particle, have the ability of stronger absorption kinetic energy, can alleviate the destruction that porcelain body bursts generation because powder bed is not fired in the insulation in the insulation shell.
(3), the insulation of Tian Chonging is not fired powder bed and is had certain heat insulating function, can prolong the piezo-resistance short circuit and puncture the time of the temperature of back localized hyperthermia's point to the insulation shell diffusion into the surface, and the temperature on corresponding reduction insulation shell surface, the harm that minimizing may cause thus.
In technical scheme of the present invention, because the insulation of being filled is not fired powder bed and can not adopted very inexpensive material, serve as, thereby can not promote the cost of manufacture of product significantly as common sand.Simultaneously, product of the present invention has still been continued to use the bipolar electrode form of traditional pressure sensitive resistor, meets the use habit of available circuit plate, in that varistor is had under the prerequisite of arc-extinguishing flame-resistant performance, can adapt with the existing conventional board design again.
In addition, in the present invention, can also on the shell wall of insulation shell, pore be set, so that when the piezo-resistance puncture short, discharge the hot gas that generates in the insulation shell.
Herein, the mechanism that pore is set on the shell wall of insulation shell is: when the moment of the breakdown short circuit of piezo-resistance, the high temperature of generation can make SI semi-insulation wrap up in seal (be generally epoxy resin and wrap up in seal) gasification.If do not offer pore on the insulation shell, the pressure in the insulation shell will be higher, causes the insulation shell cracking easily.If adopt insulation shell thicker or that intensity is higher, the then corresponding manufacturing cost that can increase product in order to prevent the insulation shell cracking.After offering pore on the insulation shell, just can address this problem effectively.Also that is to say, discharge from pore, just can adopt thin or the lower insulation shell of intensity, thereby help to obtain the varistor that hangs down cost of manufacture and have arc-extinguishing flame-retarding function as long as allow insulation wrap up in the gas that seal when gasification produce.
In the present invention, when on the shell wall at insulation shell pore being set (with regard to basic technical scheme of the present invention, can on the shell wall of insulation shell, pore be set) yet, can suitably select to insulate and not fire powder diameter in the powder bed, make it neither can spill, can not result in blockage again pore from pore.Set pore can be the pore of circular pore or other arbitrary shape, and as rectangle or bar shaped pore etc., it can be opened in the top of insulation shell or bottom, sidepiece or the like.Except that offering separately the pore, also can also be by in the manufacturing process of insulation shell, being formed naturally pore.For example, the one side of insulation shell can be designed to cover plate, and design the local size of this cover plate slightly a little bit smaller, like this, after being installed in cover plate on the insulation shell, all the other contacts site partly of cover plate and insulation shell will produce the gap and form pore.
Through actual verification, but technical scheme of the present invention is extremely simple effective, it has solved the technical barrier that exists in varistor manufacturing field for a long time, the manufacturing cost of product increases few, can prevent effectively because the electrical equipment pyrophoricity accident that arc discharge causes, and can alleviate the transmission of high heat to shell, alleviate the destruction that porcelain body bursts generation, the user also can make it and the supporting use of available circuit plate easily.
Content of the present invention further illustrates with the following Examples, but content of the present invention is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of varistor among the embodiment 1.
Fig. 2 is the A of Fig. 1---the A cutaway view.
Fig. 3 is the B of Fig. 1---the B cutaway view.
Fig. 4 is the C of Fig. 1---the C cutaway view.
Fig. 5 is the structural representation of varistor among the embodiment 2.
Fig. 6 is the D of Fig. 5---the D cutaway view.
Embodiment
Embodiment 1: shown in Fig. 1～4, varistor in the present embodiment has insulation shell 1 and the piezo-resistance main body 2 that is encapsulated in the insulation shell 1, described piezo-resistance main body 2 is by voltage-sensitive ceramic substrate 3 and seal 4 is wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed constituted, be provided with the interior electrode 5 of two separation on the surface of described voltage-sensitive ceramic substrate 3,6, on the piezo-resistance main body, be connected with first extraction electrode 7 and second extraction electrode 8, one end of described first extraction electrode 7 and second extraction electrode 8 respectively with two interior electrodes 5 of described voltage-sensitive ceramic substrate surface, 6 conductions connect, the other end of described first extraction electrode 7 and second extraction electrode 8 passes insulation and wraps up in seal 4 and extend to outside the insulation shell 1, it is characterized in that having the gap and constituting powder accommodation cavity between the outer wall of the inwall of described insulation shell 1 and piezo-resistance main body 2, in described powder accommodation cavity, be filled with insulation and do not fire powder and constitute powder bed 9 is not fired in the insulation of piezo-resistance main body 2 parcels.
In the present embodiment, the quartz sand layer that powder bed 9 constitutes for quartz sand is not fired in above-mentioned insulation.Advantage inexpensive, good flame retardation effect that the quartz sand layer that is adopted has.In addition, when adopting the alundum (Al powder, also can obtain preferable effect.
Embodiment 2: shown in Fig. 5,6, varistor in the present embodiment is similar to embodiment 1, different is: present embodiment offers the pore 10 that powder accommodation cavity is connected with outside on insulation shell 1, so that discharge the hot gas that generates in the insulation shell 1 when the piezo-resistance puncture short.
With regard to the present invention, above-mentioned pore 10 also can be opened in all the other positions of insulation shell 1.
Claims (3)
1. varistor with arc-extinguishing flame-retarding function, have insulation shell and be encapsulated in the interior piezo-resistance main body of insulation shell, described piezo-resistance main body is by the voltage-sensitive ceramic substrate and seal is wrapped up in the insulation that the voltage-sensitive ceramic substrate is sealed constituted, be provided with the interior electrode of two separation on the surface of described voltage-sensitive ceramic substrate, on the piezo-resistance main body, be connected with first extraction electrode and second extraction electrode, one end of described first extraction electrode and second extraction electrode is connected with two interior electrodes conduct of described voltage-sensitive ceramic substrate surface respectively, the other end of described first extraction electrode and second extraction electrode passes insulation and wraps up in seal and extend to outside the insulation shell, it is characterized in that having the gap and constituting powder accommodation cavity between the outer wall of the inwall of described insulation shell and piezo-resistance main body, in described powder accommodation cavity, be filled with insulation and do not fire powder and constitute powder bed is not fired in the insulation of piezo-resistance main body parcel.
2. varistor as claimed in claim 1 is characterized in that offering the pore that powder accommodation cavity is connected with outside on described insulation shell.
3. varistor as claimed in claim 1 or 2 is characterized in that it is the quartz sand layer that quartz sand constitutes that powder bed is not fired in described insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100452128A CN100464378C (en) | 2004-04-27 | 2004-05-28 | A piezoresistor having arc-extinguishing and flame-proofing function |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200410022405.1 | 2004-04-27 | ||
| CN200410022405 | 2004-04-27 | ||
| CNB2004100452128A CN100464378C (en) | 2004-04-27 | 2004-05-28 | A piezoresistor having arc-extinguishing and flame-proofing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1571077A CN1571077A (en) | 2005-01-26 |
| CN100464378C true CN100464378C (en) | 2009-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100452128A Expired - Lifetime CN100464378C (en) | 2004-04-27 | 2004-05-28 | A piezoresistor having arc-extinguishing and flame-proofing function |
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| CN (1) | CN100464378C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801407A (en) * | 2006-01-11 | 2006-07-12 | 成都铁达电子有限责任公司 | Long life explosion-proof type piezoresistor |
| CN100444289C (en) * | 2006-04-03 | 2008-12-17 | 广东省佛山科星电子有限公司 | Safety voltage dependent resistor |
| CN101162631B (en) * | 2006-10-13 | 2010-05-12 | 李炬 | Piezoresistor having arc extinction fire retardant function |
| CN101079341B (en) * | 2007-04-23 | 2011-06-29 | 苏州中普电子有限公司 | Non-combustible pressure-sensitive resistor |
| CN102237161B (en) * | 2010-05-06 | 2012-09-05 | 成都铁达电子有限责任公司 | Thin arc extinction flame-retardant piezoresistor |
| CN102779601B (en) * | 2011-05-09 | 2015-06-17 | 曾清隆 | Manufacturing method for passive electric component having over-temperature protection function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331860A (en) * | 1979-12-03 | 1982-05-25 | Fritz Eichenauer Gmbh & Co. Kg | Electrical resistance heating element |
| CN2197730Y (en) * | 1994-09-15 | 1995-05-17 | 安徽省合能电气研究所 | ZnO pressure sensative resistor |
| CN2736897Y (en) * | 2004-04-27 | 2005-10-26 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
-
2004
- 2004-05-28 CN CNB2004100452128A patent/CN100464378C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4331860A (en) * | 1979-12-03 | 1982-05-25 | Fritz Eichenauer Gmbh & Co. Kg | Electrical resistance heating element |
| CN2197730Y (en) * | 1994-09-15 | 1995-05-17 | 安徽省合能电气研究所 | ZnO pressure sensative resistor |
| CN2736897Y (en) * | 2004-04-27 | 2005-10-26 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
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| Publication number | Publication date |
|---|---|
| CN1571077A (en) | 2005-01-26 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: CHENGDU TIEDA ELECTRONIC Co.,Ltd. Assignor: Li Ju|Jing Lu Wei|Tan Yicheng Contract record no.: 2011510000311 Denomination of invention: Piezoresistor having arc extinction fire retardant function Granted publication date: 20090225 License type: Exclusive License Open date: 20050126 Record date: 20111017 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160125 Address after: 611743 Sichuan province Pixian Chengdu modern industrial port area North Road No. 733 Patentee after: CHENGDU TIEDA ELECTRONIC Co.,Ltd. Address before: 610081, 2, West China Garden, No. 32, Ma on North Road, Sichuan, Nanyuan, 12, Chengdu Patentee before: Li Ju Patentee before: Jing Lu Wei Patentee before: Tan Yicheng |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 610000 Sichuan province Chengdu city Chengdu district modern PI Du Industrial Area North Port Road No. 733 Patentee after: CHENGDU TIEDA ELECTRONICS Corp. Address before: 611743 Sichuan province Pixian Chengdu modern industrial port area North Road No. 733 Patentee before: CHENGDU TIEDA ELECTRONIC Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090225 |