CN2736897Y - A piezoresistor having arc-extinguishing and flame-proofing function - Google Patents
A piezoresistor having arc-extinguishing and flame-proofing function Download PDFInfo
- Publication number
- CN2736897Y CN2736897Y CN 200420034541 CN200420034541U CN2736897Y CN 2736897 Y CN2736897 Y CN 2736897Y CN 200420034541 CN200420034541 CN 200420034541 CN 200420034541 U CN200420034541 U CN 200420034541U CN 2736897 Y CN2736897 Y CN 2736897Y
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- voltage
- insulation
- piezo
- powder
- sensitive resistor
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Abstract
The utility model relates to a voltage-sensitive resistor with the functions of arc extinguishing and flame resistance, which is provided with an insulating shell and a voltage-sensitive resistor body packed in the insulating shell. The utility model is characterized in that a gap is arranged between the inner wall of the insulating shell and the outer wall of the voltage-sensitive resistor body to form a sealed powder accommodating cavity, and insulated non-inflammable powder is filled in the powder accommodating cavity to form an insulated non-inflammable powder layer used for covering the voltage-sensitive resistor body. The utility model has the advantages of simple structure and effective effect, solves the technical problems existing in the manufacturing field of the voltage-sensitive resistor for a long time, has low increase for the manufacturing cost of products, can effectively prevent the flammable accident of the electric apparatus caused by arc discharge, can relieve high heat from being transmitted to the shell, and reduces the damage generated by the explosive disruption of a porcelain body. The user can also conveniently make the voltage-sensitive resistor matched with the existing circuit board to use.
Description
Technical field
The utility model 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.
The utility model content
The purpose of this utility model 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 not 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 utility model 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 airtight 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 utility model, 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 fine sand form, 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 the technical solution of the utility model, 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 utility model 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.
Therefore, compared with the aforementioned existing similar products, but the technical solution of the utility model 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 hot transmission to shell of height, alleviate porcelain body and burst the destruction of generation, the user also can make it and the supporting use of available circuit plate easily.
Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of varistor among the embodiment.
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.
Embodiment
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 airtight 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.
Claims (2)
1, a kind of 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 airtight 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 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 |
|---|---|---|---|
| CN 200420034541 CN2736897Y (en) | 2004-04-27 | 2004-04-27 | A piezoresistor having arc-extinguishing and flame-proofing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420034541 CN2736897Y (en) | 2004-04-27 | 2004-04-27 | A piezoresistor having arc-extinguishing and flame-proofing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2736897Y true CN2736897Y (en) | 2005-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420034541 Expired - Lifetime CN2736897Y (en) | 2004-04-27 | 2004-04-27 | A piezoresistor having arc-extinguishing and flame-proofing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2736897Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464378C (en) * | 2004-04-27 | 2009-02-25 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
-
2004
- 2004-04-27 CN CN 200420034541 patent/CN2736897Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464378C (en) * | 2004-04-27 | 2009-02-25 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140427 Granted publication date: 20051026 |