CN201122474Y

CN201122474Y - Flame-proof anti-explosion protector for surge

Info

Publication number: CN201122474Y
Application number: CNU2007201260853U
Authority: CN
Inventors: 王建文; 韩伟; 岳澍华
Original assignee: Xi An Xiwuer Electronic & Information Group Co Ltd
Current assignee: Xi An Xiwuer Electronic & Information Group Co Ltd
Priority date: 2007-11-30
Filing date: 2007-11-30
Publication date: 2008-09-24
Anticipated expiration: 2017-11-30

Abstract

The utility model relates to a flame-resistant and bursting-proof surge protection device, which comprises a voltage dependent resistance chip and a flame-resistant outer casing. The utility model adopts the structure that the voltage dependent resistance is packaged and sealed by a non-flammable organic silicon, insulation flame-resistant inorganic material is adopted as an inner lining, simultaneously, the insulation flame-resistant inorganic material is used to fill the space formed between the voltage dependent resistance and the outer casing, to ensure that the periphery of the voltage dependent resistance is filled with inorganic material with strong non-flammable performance and flame-resistant performance, the arc pulling phenomenon of air after being ionized under the high temperature condition can be efficiently restrained, the arc eliminating and flame and the flame-resistant functions can be performed, and the flame-resistant performance can be greatly improved; the wrapping intensity to the voltage dependent resistance is greatly increased because of the quality and density performance of the inner lining plate and the filling material, to ensure that the voltage dependent resistance has better bursting-proof performance. Therefore, the flame-resistant and bursting-proof surge protection device is provided with good flame-resistant and bursting-proof performance.

Description

Fire-retardant anti-cracking Surge Protector

Technical field

The utility model relates to a kind of Surge Protector, relates in particular to a kind of fire-retardant anti-cracking Surge Protector.

Background technology

In prior art, common device of surge protector comprises piezo-resistance and low temperature solder joint tripping mechanism, and its main effect is to make electronic equipment avoid lightning impulse to destroy and other transient overvoltage interference.In use find; when extraneous surge energy surpasses the tolerance of piezo-resistance; voltage dependent resistor chip is through the breakdown short circuit of regular meeting; because transient energy is very big during short circuit; the punch through damage place produces localized hyperthermia because of the arc discharge meeting; plastic casing in the module of may igniting might cause electric equipment on fire when serious.In order to prevent the burning of varistor; added fire proofing in the shell; and varistor is potted in the shell with incombustible epoxy resin; though shell and epoxy resin have fire resistance; but still do not reach fully fire-retardant effect; that is to say; when piezo-resistance punctures generation high temperature; can make the epoxy resin cracking of embedding; high temperature conduction is on shell and ignited, because shell is a kind of organic substance, it can produce the dense smoke that is rich in carbon dust; this dense smoke can destroy the insulation of flame retardant plastics case surface, produces electric arc and causes burning thereby make between the Surge Protector line.Therefore, only with inflaming retarding shell Surge Protector is carried out fire-retardantly, its reliability is not high.Moreover, in use also find, when extraneous surge energy surpassed the tolerance of piezo-resistance, voltage dependent resistor chip also can occur bursting except easy breakdown short circuit, because the energy that bursts is bigger, sometimes the situation of being scraped also appears in the flame retardant plastics shell, and fragment flies in the electronic equipment, can influence the normal condition of other circuit, in prior art, do not see that also this situation about bursting is had counter-measure preferably at present.

The utility model content

The purpose of this utility model is at the problem in the prior art, provides a kind of reliability higher fire-retardant anti-cracking Surge Protector.

For achieving the above object, the technical solution of the utility model is as follows:

It comprises the inflaming retarding shell of a voltage dependent resistor chip and this voltage dependent resistor chip, it improves structure: the outer surface at this voltage dependent resistor chip is provided with one deck organosilicon encapsulated layer, inner surface at this piezo-resistance shell is provided with the liner plate that one deck is made by the fire-retardant inorganic material of insulation at least, fills the fire-retardant inorganic material of insulation in the space in shell.

The further improvement project of the utility model is as follows:

Described interior lining panel is a micarex, and filling the fire-retardant inorganic material of insulation in the described shell is micarex, asbestos, quartz sand, mullite or silicates refractory material.

Described inflaming retarding shell is made of the inner box in an outer box and the outer box of insertion, described piezo-resistance is contained in the inner box, all be provided with one deck mica interior lining panel at least at the inner surface of described inner box and the outer surface of interior box plate, in inner box, fill micarex, asbestos, quartz sand, mullite or silicates refractory material.

By technique scheme as can be seen, the utility model has at first used a kind of incombustible organosilicon that piezo-resistance is sealed, adopted the fire-retardant inorganic material of a kind of insulation (as: micarex) to make liner then again, simultaneously, with the fire-retardant inorganic material of insulation the space between piezo-resistance and the shell is filled again, making piezo-resistance is not burn and the very strong inorganic material of anti-flaming thermal-insulation performance all around entirely, make it can suppress the phenomenon of air ionization arcing at high temperature effectively, play the effect of arc-extinguishing flame-resistant, like this, both made the be short-circuited situation of high temperature of piezo-resistance, its peripheral material and smokeing clogging can not ignite yet, and insulate between failure line, its fire resistance is improved greatly; Owing to the loose performance of interior lining panel and packing material, the impulsive force when buffer chip bursts greatly makes it have anti-cracking performance preferably again.Therefore, the utlity model has good fire-retardant and anti-cracking performance, be applicable to the lightning protection of unattended operation website.

Description of drawings

Fig. 1, the utility model are used for the structure cutaway view (the A-A section of Fig. 2) of Surge Protector.

The deterioration tripping mechanism figure of Fig. 2, Surge Protector (the B-B section of Fig. 3).

The vertical view of Fig. 3, Fig. 2.

Embodiment

Structure with a kind of Surge Protector is that example describes below.

Referring to Fig. 1～3; this Surge Protector has a flame retardant plastics shell; this shell is made of the inner box 2 in an outer box 1 and the outer box of insertion; piezo-resistance 3 is housed in the inner box; and this piezo-resistance surface seals one deck organosilicon, at the inner box plate outer side as shown in Figure 2 piezo-resistance deterioration tripping mechanism 4 is housed.Structure at this Surge Protector; inner surface at inner box comprises inner bottom surface and is equipped with village's plate 5 in the mica all around; outer surface at interior box plate also is provided with one deck mica interior lining panel 5 ', fills micarex, asbestos, quartz sand, mullite or silicates refractory material 6 in inner box.As can be seen from Figure 1, have the fire-retardant inorganic material (being encapsulated layer, interior lining panel, inserts) of insulation piezo-resistance 3 is formed closely parcel, simultaneously, the anti-flaming thermal-insulation performance for box plate in further strengthening also is lined with one deck micarex 5 ' at interior box plate skin.

This Surge Protector structure has following characteristics:

1, chip varistor resistance is sealed with liquid organosilicon, not only flame retardant rating height, and operating procedure Simply, cost is also relatively low, and can reduce contacting of chip and air, has reduced air and has existed The ability of ionization arcing under the high temperature.

2, the inserts in the inner box can utilize its cotton-shaped loose performance absorbent core sheet to burst on the one hand Kinetic energy, alleviate and burst the destruction that fragment produces; It can play the anti-flaming thermal-insulation effect on the other hand, Delay high temperature that chip produces because of short circuit to external diffusion, reduce the hull-skin temperature of inner box, be inner box The disengaging of low temperature solder joint provides the necessary time in the outer tripping mechanism, thereby the probability that will burn drops to Low.

3, the mica interior lining panel 5 ' that arranges at the inner box plate outer surface, internally box plate is further Carry out anti-flaming thermal-insulation, prevent box plate in the high temperature melt after chip punctures and affect deterioration dropout machine The running orbit of activity template in the structure; Simultaneously, because mica interior lining panel 5 ' the fire-retardant matter is close, can be more Effectively isolate the burning that inner box high temperature causes, reach the fire-retardant effect in base plate two sides.

Claims

1, a kind of fire-retardant anti-cracking Surge Protector; it comprises the inflaming retarding shell (1,2) of a voltage dependent resistor chip (3) and this voltage dependent resistor chip; it is characterized in that: the outer surface at this voltage dependent resistor chip is provided with one deck organosilicon encapsulated layer; inner surface at this piezo-resistance shell is provided with the liner plate (5) that one deck is made by the fire-retardant inorganic material of insulation at least, fills insulation fire-retardant inorganic material (6) in the space in shell.

2, fire-retardant anti-cracking Surge Protector according to claim 1; it is characterized in that: described interior lining panel (5) is a micarex, and filling the fire-retardant inorganic material of insulation (6) in the described shell is micarex, asbestos, quartz sand, mullite or silicates refractory material.

3, fire-retardant anti-cracking Surge Protector according to claim 1 and 2; it is characterized in that: described inflaming retarding shell is made of the inner box (2) in an outer box (1) and the outer box of insertion; described piezo-resistance (3) is contained in the inner box; all be provided with one deck mica interior lining panel (5) at least at the inner surface of described inner box and the outer surface of interior box plate, in inner box, fill micarex, asbestos, quartz sand, mullite or silicates refractory material (6).