CN100444289C - Safety voltage dependent resistor - Google Patents
Safety voltage dependent resistor Download PDFInfo
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- CN100444289C CN100444289C CNB2006100347031A CN200610034703A CN100444289C CN 100444289 C CN100444289 C CN 100444289C CN B2006100347031 A CNB2006100347031 A CN B2006100347031A CN 200610034703 A CN200610034703 A CN 200610034703A CN 100444289 C CN100444289 C CN 100444289C
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- top cover
- insulation shell
- voltage dependent
- dependent resistor
- resistance
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Abstract
The present invention discloses a safety voltage dependent resistor which mainly comprises a voltage dependent resistor 1 and an insulating casing 2, wherein a main body of the voltage dependent resistor 1 is sealed in the insulating casing 2, and an electrode 5 and an electrode 6 which are mutually separated are arranged on the voltage dependent resistor 1; the electrode 5 and the electrode 6 pass through the bottom surface of the insulating casing 2 and extend outside the insulating casing 2. The top of the insulating casing 2 is opened, and a top cover 3 is tightly combined on the opening part of the top; two or more than two ventilation holes 7 are arranged on the top cover 3, and a ventilation film 8 is also tightly jointed on the top cover 3. When the voltage dependent resistor loses effectiveness and quickly raises temperature, the present invention can prevent occurrence of fire from many links; in addition, the present invention has the advantages of simple structure and low cost, and can be widely used for electric appliances which use the voltage dependent resistor to carry out overvoltage protection.
Description
Technical field
The present invention relates to piezo-resistance, relate in particular to a kind of safe type piezoresistor.
Background technology
Piezo-resistance is actually a kind of voltage-current characteristic and is nonlinear voltage sensitive element, and under the normal voltage condition, it is equivalent to a capacitor; When overvoltage appears in circuit, its internal resistance sharply descends and conducting rapidly, thereby has protected the unlikely overvoltage of other components and parts in the circuit effectively and damage.But simultaneously, because piezo-resistance electric current when losing efficacy sharply increases, temperature significantly rises, and the insulation and moisture that wrap up in envelope outside the voltage-sensitive ceramic substrate may be wrapped up in seal and ignite, and causes piezo-resistance fire burns, thereby initiation fire.Therefore, how preventing the generation of fire when pressure responsive resistor failure, is the problem that must solve in the piezo-resistance practical application.
One example of prior art is ZL200420033754.9 for China Patent No., as shown in Figure 1, insulation shell 2 be around integral structure, piezo-resistance 1 is encapsulated in the insulation shell 2, two electrodes 5,6 of piezo-resistance 1 pass the bottom surface of insulation shell 2 and extend to the outside of insulation shell, are filled with the fire-retardant particle of insulation in the cavity volume 4 that forms between insulation shell 2 and the piezo-resistance 1.Offer the air vent hole 7 with extraneous UNICOM on insulation shell, when piezo-resistance 1 lost efficacy rapid temperature rise, thereby this technology the certain preventive effect of having of fire burns initiation fire for piezo-resistance.But this patent still exists following defective:
1, because the direct and extraneous directly UNICOM of air vent hole does not have any protection quarantine measures, and so in processes such as production, transportation, installation, debugging, the fire-retardant particle of insulation that the fine powder shape will occur is omitted from air vent hole; The fire-retardant particulates plug air vent hole of bigger insulation perhaps occurs, the powerful thermal current that produces when pressure responsive resistor failure heats up rapidly is because the obstruction of the path of releasing will increase insulation shell blast and cracked possibility greatly.
2, when pressure responsive resistor failure heats up rapidly, will produce powerful thermal current in the cavity volume, when air vent hole all is not enough to reveal, alleviate the pressure of gas of rapid rising, maybe when the fire-retardant particulates plug air vent hole of insulation, it is cracked that powerful thermal current will make insulation shell blast, the electronic devices and components around damaging.
Summary of the invention
At the deficiencies in the prior art, a kind of simple in structure, safe and reliable safe type piezoresistor of the special proposition of the present invention.
In order to achieve the above object, the technical scheme taked of the present invention is as follows:
A kind of safe type piezoresistor mainly comprises piezo-resistance 1 and insulation shell 2, and piezo-resistance 1 is arranged in the insulation shell 2, and the electrode on the piezo-resistance 1 passes the diapire of insulation shell 2 and extends to the outside of insulation shell 2; Described insulation shell 2 is open-topped container shapes, connects top cover 3 separably at top open part; Above-mentioned insulation shell 2 forms cavity volume 4 with top cover 3, and two or more air vent holes 7 are arranged on the top cover 3, and top cover 3 inboard applying ventilated membranes 8 are filled with the fire-retardant particle of insulation in the cavity volume 4.
The thermal current that air vent hole 7 on the above-mentioned top cover 3 produces when being used for releasing and heating up owing to pressure responsive resistor failure, reducing the air pressure in the cavity volume 4, air vent hole 7 be shaped as circle, rectangle or other shape.
Above-mentioned insulation shell 2 connects top cover 3 separably at top open part, be meant that top cover 3 and insulation shell 2 are two assemblies that separate, top cover 3 covers at insulation shell 2 top open parts, and be connected with certain mechanical strength with insulation shell 2, make top cover 3 in normal use, installation process, both can not break away from; But when cavity volume 4 internal gas pressures sharply rise to air vent hole 7 and can not enough discharge thermal current, can reliably break away between the two.
Above-mentioned top cover 3 is syndeton separably with insulation shell 2, is used to discharge the powerful thermal current that sharply heated up and produced when piezo-resistance 2 lost efficacy.Promptly when piezo-resistance 2 owing to lost efficacy or when producing arc light surrounding medium sharply being heated up, if air vent hole 7 can not discharge the powerful thermal current that produces in the cavity volume effectively, thermal current can be washed top cover 3 open and outwards discharge, and does not explode and perilesional electronic devices and components and can not cause whole chamber wall to be broken.
Be filled with the fire-retardant particle of insulation in the above-mentioned cavity volume 4, the fire-retardant particle that insulate can be a quartz sand etc.; Its main effect is to absorb the heat energy that heats up and produce owing to piezo-resistance 1 in the cavity volume 4, also can cushion because piezo-resistance sharply heats up and issuable arc light, simultaneously, when insulation shell 2 is blasted and is cracked, a part of kinetic energy be can absorb, the blast and the cracked extent of damage reduced.
Above-mentioned ventilated membrane 8 is fitted in top cover 3 medial surfaces, also can be set directly between top cover 3 and the fire-retardant particle of insulation, can not be leaked to air vent hole 7 as long as guarantee the fire-retardant particle of insulation, all is the application structure that is equal to.Ventilated membrane 8 is to have materials such as the high-molecular organic material of airing function or paper material.Guaranteeing cavity volume 4 and extraneous the maintenance under the logical prerequisite of gas phase, because the physical isolation effect of ventilated membrane 8, the fire-retardant particle that insulate can not leak to space outerpace, can not block air vent hole 7 yet.
In addition, can also on top cover 3 inboards or the outside, smear paraffin, thus the air vent hole 7 on can closed roof 3.So be provided with, can substitute ventilated membrane 8, when making apparatus of the present invention operate as normal, installation, the fire-retardant particle that insulate can not leak to space outerpace, can not block air vent hole 7 yet; When apparatus of the present invention non-normal working, melted paraffin wax, the high-temperature gas in the cavity volume 4 can be discharged cavity volume 4 smoothly.
The diapire of above-mentioned insulation shell 2, with insulation shell 2 sidewalls are integrative-structures.In actual use, diapire also can be two parts that separate with sidewall, but when combine and assemble, this diapire and sidewall can be connected as one securely by welding, method such as bonding, and all is the application scheme that is equal to so.If but adopt separate type, the high-temperature gas that when piezo-resistance 1 non-normal working, produces, can make insulation shell 2 softening, thereby very easily make between the diapire of insulation shell 2 and the sidewall and the slit occurs, high-temperature gas can be revealed from this slit and go out, and damages the devices such as wiring board that are connected with the electrode of piezo-resistance 1.Though, be inferior relatively technical scheme so separate type is the application scheme that is equal to.
The electrode of above-mentioned piezo-resistance 1 generally comprises electric input and output electrode 5 and electrode 6.
Compare with prior art; the invention has the beneficial effects as follows: (1) is if thermal current is very powerful and very fast in the cavity volume; by releasing of described air vent hole and ventilated membrane; still can not in time reduce the air pressure in the cavity volume, so, because top cover and insulation shell are the syndetons of separate type; thermal current will be washed top cover open; avoid insulation shell to produce whole blast and cracked possibility, thereby effectively protected the electronic element on the circuit board, reduced the extent of damage.(2) take ventilated membrane or paraffin to be fitted in structure on the top cover, can prevent effectively that the fire-retardant particle of insulation in the cavity volume from leaking to the external world by air vent hole, also can effectively prevent the fire-retardant particulates plug air vent hole of insulation in the cavity volume, like this, guarantee the gas effect of releasing of air vent hole; (3) the present invention is simple in structure, and is with low cost, and fire-retardant particle of used insulation and ventilated membrane are common material that is easy to get and material, can not increase cost of the present invention.
The present invention is widely used in household electrical appliance, power supply product, computer center, communication field etc. to be needed in the overvoltage protection occasion of piezo-resistance.
Description of drawings
Fig. 1 is that the patent No. is the prior art constructions schematic diagram;
Fig. 2 is the structural representation of varistor in the embodiment of the invention;
Fig. 3 is the A-A cutaway view of Fig. 2;
Fig. 4 is the B-B cutaway view of Fig. 2.
Description of reference numerals: 1-piezo-resistance; The 2-insulation shell; The 3-top cover; The 4-cavity volume; 5, the electrode of 6-piezo-resistance; The 7-air vent hole, the 8-ventilated membrane.
Embodiment
Below in conjunction with accompanying drawing, specify the specific embodiment of the present invention:
Shown in Fig. 2-4, a kind of safe type piezoresistor, mainly comprise piezo-resistance 1 and insulation shell 2, insulation shell 2 is open-topped cup-shaped, and the bonding top cover 3 of top open part, form a close cavity 4 between insulation shell 2 and the top cover 3, piezo-resistance 1 is encapsulated in the cavity volume 4, is filled with the fire-retardant particle of quartz sand in the cavity volume 4.The electrode 5 of piezo-resistance 1, electrode 6 pass the diapire of insulation shell 2 and extend to the outside of insulation shell 2; On top cover 3, four air vent holes 7 have been offered, a large amount of thermal currents that produce when releasing owing to piezo-resistance 1 inefficacy temperature rise; The medial surface of top cover 3 is fitted with ventilated membrane 8, and ventilated membrane 8 can make cavity volume 4 and the extraneous gas phase that keeps lead to, and ventilated membrane 8 can prevent effectively that the fire-retardant particle of quartz sand is leaked to the external world, can also prevent effectively that the fire-retardant particle 9 of quartz sand from blocking air vent holes 7.
When piezo-resistance 1 short circuit, can absorb lot of energy, the fire-retardant particle of quartz sand in the cavity volume 4 can absorb heat energy and kinetic energy, simultaneously, thermal current is by releasing to space outerpace in ventilated membrane 8, four air vent holes 7, to reduce the air pressure in the cavity volume 4, avoids the blast of insulation shell and cracked; If the thermal current in the cavity volume 4 is very powerful and rapid, by releasing of described ventilated membrane 8, air vent hole 7, in the time of still can not reducing the air pressure in the cavity volume 4, powerful thermal current will be washed top cover 3 open and the whole blast of insulation shell and cracked can not take place.
Claims (1)
1. a safe type piezoresistor mainly comprises piezo-resistance (1) and insulation shell (2), and piezo-resistance (1) is arranged in the insulation shell (2); The electrode of piezo-resistance (1) passes the diapire of insulation shell (2) and extends to the outside of insulation shell (2), it is characterized in that:
Described insulation shell (2) is open-topped container shapes, connects top cover (3) separably at top open part; Insulation shell (2) forms cavity volume (4) with top cover (3);
Two or more air vent holes (7) are arranged on the described top cover (3);
Be filled with the fire-retardant particle of insulation in the described cavity volume (4);
The inboard applying ventilated membrane of described top cover (3) (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100347031A CN100444289C (en) | 2006-04-03 | 2006-04-03 | Safety voltage dependent resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100347031A CN100444289C (en) | 2006-04-03 | 2006-04-03 | Safety voltage dependent resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1828786A CN1828786A (en) | 2006-09-06 |
| CN100444289C true CN100444289C (en) | 2008-12-17 |
Family
ID=36947103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100347031A Expired - Fee Related CN100444289C (en) | 2006-04-03 | 2006-04-03 | Safety voltage dependent resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100444289C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162631B (en) * | 2006-10-13 | 2010-05-12 | 李炬 | Piezoresistor having arc extinction fire retardant function |
| CN110690018A (en) * | 2019-11-08 | 2020-01-14 | 厦门赛尔特电子有限公司 | Explosion-proof flame-retardant piezoresistor and automatic production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978203A (en) * | 1996-04-03 | 1999-11-02 | Matsushita Electric Industrial Co., Ltd. | Electronic part having communication means |
| CN1571077A (en) * | 2004-04-27 | 2005-01-26 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
| CN1731541A (en) * | 2005-09-07 | 2006-02-08 | 李炬 | Voltage sensitive resistor with arc-extinguishing flame-retarding function |
-
2006
- 2006-04-03 CN CNB2006100347031A patent/CN100444289C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978203A (en) * | 1996-04-03 | 1999-11-02 | Matsushita Electric Industrial Co., Ltd. | Electronic part having communication means |
| CN1571077A (en) * | 2004-04-27 | 2005-01-26 | 李炬 | A piezoresistor having arc-extinguishing and flame-proofing function |
| CN1731541A (en) * | 2005-09-07 | 2006-02-08 | 李炬 | Voltage sensitive resistor with arc-extinguishing flame-retarding function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1828786A (en) | 2006-09-06 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081217 Termination date: 20140403 |