CN101261893A - Heat protection pressure sensitive resistor module - Google Patents
Heat protection pressure sensitive resistor module Download PDFInfo
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- CN101261893A CN101261893A CNA200810088691XA CN200810088691A CN101261893A CN 101261893 A CN101261893 A CN 101261893A CN A200810088691X A CNA200810088691X A CN A200810088691XA CN 200810088691 A CN200810088691 A CN 200810088691A CN 101261893 A CN101261893 A CN 101261893A
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- sensitive resistor
- pressure sensitive
- heat protection
- oxide varistor
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- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 44
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 44
- 230000004044 response Effects 0.000 claims abstract description 38
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- 230000008018 melting Effects 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 229910000679 solder Inorganic materials 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 238000013461 design Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 238000010891 electric arc Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 208000002925 dental caries Diseases 0.000 claims description 4
- 230000005496 eutectics Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910000743 fusible alloy Inorganic materials 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims 1
- 230000004888 barrier function Effects 0.000 claims 1
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000003063 flame retardant Substances 0.000 claims 1
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
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- 230000000452 restraining effect Effects 0.000 description 7
- 238000012800 visualization Methods 0.000 description 6
- 230000001012 protector Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910000410 antimony oxide Inorganic materials 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
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- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
- H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
- H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/10—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess voltage, e.g. for lightning protection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/32—Insulating body insertable between contacts
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
Abstract
The invention provides a thermal protection voltage-sensitive resistor module used for surge protection, which consists essentially of a metal oxide voltage-sensitive resistor, a thermal response switch, a set of thruster with a compression spring and a wedge-shaped quencher and a case. Thermal coupling exists between the thermal response switch and the metal oxide voltage-sensitive resistor. When the metal oxide voltage-sensitive resistor is overstressed, the resistor emits heat, the thermal response switch can immediately sense the heat and soften the welding point of solder with low melting point, then the welding point is forced to be quickly disconnected and part of the wedge-shaped quencher is inserted into the clearance at the breakage place of the welding point under the joint effect of the thruster with the spring and the wedge-shaped quencher and the resilient conductive connection arm, thus the quenching effect is enhanced.
Description
Technical field
The present invention relates to a kind of heat protection pressure sensitive resistor module, particularly relate to the surge protection device of a kind of use in power-supply system or a kind of angle of rake heat protection pressure sensitive resistor module that has compression spring and wedge shape extinguisher of transient voltage surge protection device.
Background technology
Current, metal-oxide varistor (hereinafter to be referred as MOV) is widely used in the surge restraining device.Normally MOV is directly connected between phase line and the ground wire or the neutral line on electric, is used for consuming appearance voltage surge energy on the line.Yet, in the MOV course of work, may be subjected to the various stress that add, temperature stress for example, surge energy stress or temporary overvoltage stress etc.When MOV suffered overstress, when just surpassing the rated value of MOV, the characteristic of MOV may be degenerated, and caused leakage current to increase, and may generate heat, and also the thermal breakdown short circuit may take place.The heating of MOV, make the temperature rising (abbreviating temperature rise as) of MOV itself, when temperature rise reach it around combustible material, for example during the burning-point of epoxy resin coat or plastic casing, the surge restraining device may fight and cause the burning of the combustible around the surge restraining device.
In order to improve the accident problem of surge restraining device, design miscellaneous has appearred.Wherein having mechanical type heat to thread off designs; as with United States Patent (USP) number US 6; 211; a kind of metal-oxide varistor module (Metal Oxide Varistor Modular) and United States Patent (USP) number US5 are disclosed for No. 770; 901; a kind of design with metal-oxide varistor (Metal Oxide Varistorhaving thermal protection) of heat protection is disclosed for No. 027; also has United States Patent (USP) number US6; 636; disclose the design of a kind of heat protection metal-oxide varistor (Thermally Protected Metal OxideVaristor) for No. 403, these all are a kind of heat protection pressure sensitive resistors of taking hot safeguard measure.These hot resist technology measures are not the combinations of adopting low-melting alloy solder joint and spring element, adopt thermal cut-off (TCO) exactly.Though, this MOV used in the surge protector circuit, can from current supply circuit, break away from the MOV that had lost efficacy and come; to a certain extent; catching fire of surging protecter in advance, still, its weak point is; sometimes; when heat protection contact disconnects, between the gap that forms after the disconnection, produce electric arc, if electric arc is not extinguished; then the big fault current that comes from power supply still may continue to keep, and surge protector still has the possibility of catching fire.Therefore; for the security of operation that makes surge protector and reliable; U.S. UL company; the UL1449 safety standard is revised; bear the date of in the redaction of the 3rd edition UL1449 standard on September 29th, 2006, the accessible fault current (Intermediatecurrent test-available fault current from AC source of supply) from AC power has been done strict requirement.
Also have some referenced patent of quoting to be: US3626348 Alten, US4249224 Baumbach, US4249224 Ikda, etal, US4562323 Belbel, US 5311164Ikeda.
Summary of the invention
Goal of the invention:
The present invention has overcome the shortcoming that existing heat protection pressure sensitive resistor can only be blocked less fault current.A kind of product that is used for the angle of rake heat protection metal oxide voltage-sensitive resistor blocks that has spring and wedge shape extinguisher that can block big intermediate current of surge protector and transient voltage surge restraining device is provided.The technical scheme of invention:
In order to solve existing technical problem, the present invention is achieved through the following technical solutions.
The invention provides a kind of heat protection pressure sensitive resistor module.Particularly a kind of angle of rake heat protection pressure sensitive resistor module that has spring and wedge shape extinguisher that is used for overvoltage inhibiting apparatus or transient voltage surge restraining device.The above-mentioned angle of rake heat protection pressure sensitive resistor module that has spring and wedge shape extinguisher is by a metal-oxide varistor; One by lid and the shell that base constitutes; A thermal response switch assembly; Propeller that has spring and a wedge shape extinguisher and and two leads form.Above-mentioned metal-oxide varistor welds first sheet metal electrode and second sheet metal electrode respectively by high-temperature solder on the surface of its two silver electrodes, have the conducting terminal of first weak point that is connected with above-mentioned thermal response switch assembly on the first above-mentioned sheet metal electrode surface of above-mentioned metal-oxide varistor.Prolongation on second above-mentioned sheet metal electrode surface forms second conductive pin by above-mentioned base, and above-mentioned metal-oxide varistor also has moistureproof coating; The middle part of above-mentioned base has perpendicular to the dividing plate in baseplane, and when lid engaged with base, above-mentioned dividing plate was separated into two adjacent cavitys to inner cavity, and they are respectively first cavity and second cavity; The second above-mentioned cavity holds part in the chamber of metal-oxide varistor and above-mentioned second conductive pin, second above-mentioned conductive pin reaches the outside by the hole on the base, the first above-mentioned cavity holds above-mentioned thermal response switch assembly and first above-mentioned conductive pin, and first above-mentioned conductive pin reaches the outside by another hole on the base; The normally closed contact of above-mentioned thermal response switch assembly is a pad that is made of solder, this pad welds together first above-mentioned short conducting terminal and conduction linking arm a normally closed switch of formation, therein, the prolongation of above-mentioned conduction linking arm is exactly first conductive pin, if metal-oxide varistor is subjected to the effect of overstress, the temperature of itself is raise, this temperature transfer reaches on the pad of thermal response switch assembly, when reaching the softening point of being scheduled to of eutectic solder, the thermal response switch assembly is subjected to the default resilience force of above-mentioned conduction linking arm and disconnects; The above-mentioned propeller part that has spring and a wedge shape extinguisher can be on being in above-mentioned base be slided in the groove of the guiding rail of upright position by guiding projection branch itself, make it just in time to aim at above-mentioned low melting point pad, when this pad is softening, because the effect of the resilience force of compression spring, propeller moves up, impel pad easier separately, the wedge shape extinguisher part at above-mentioned angle of rake top just is inserted between the formed gap of gap of pad, plays the effect of the electric arc that goes out.
The present invention also provides the design of another heat protection pressure sensitive resistor module, particularly a kind of angle of rake heat protection pressure sensitive resistor module that has spring and wedge shape extinguisher that is used for overvoltage inhibiting apparatus or transient voltage surge restraining device; In order to make it to have the function of operating state indication and remote alarm, in angle of rake top design a columniform cue mark part is arranged, and, make when operate as normal, a columniform prolongation in the propeller lower end exposes the hole on the base, when above-mentioned thermal response switch moves, the columniform cue mark part at above-mentioned propeller top reaches the outside of the lid of above-mentioned shell by the hole of above-mentioned cap top, constitute a mechanical mode indicator, for eye-catching, can partly apply a kind of eye-catching color to above-mentioned cue mark, for example red.When above-mentioned cue mark exposes, just show that above-mentioned thermal response switch assembly moves, and the expression heat protection pressure sensitive resistor module lost efficacy.Simultaneously, if the user wants to utilize the columniform extension of propeller lower end to assign to trigger the sensitive switch that is assemblied in the electricity on circuit board or the mounting plate, when above-mentioned propeller moves up, originally pressing the columniform prolongation of propeller lower end of button of the sensitive switch of electricity no longer to make the button pressurized of the sensitive switch of electricity, conversion takes place in the changeover contact of sensitive switch inside of electricity immediately, thereby remote alarm signal is sent in action that can control relay.
Useful effect:
Common heat protection pressure sensitive resistor owing to there is not good arc extinguishing measure, can not be blocked big power frequency fault current, has only limited protective effect.The design of heat protection pressure sensitive resistor module of the present invention has a movably extinguisher, can get involved at the thermal switch contact to disconnect between the gap of back formation, plays the arc extinguishing effect.Learn that through experiment the product that designs and produces according to the present invention can block 1000 amperes of power frequency intermediate currents.This is that general heat protection pressure sensitive resistor institute is unapproachable.
Description of drawings
Fig. 1 is the section visualization view that illustrates the heat protection pressure sensitive resistor module of preferred specific embodiment of the present invention.
Fig. 2 is as shown in Figure 1 the front and the side sectional view of heat protection pressure sensitive resistor module when being illustrated in operate as normal.
Fig. 3 is front and the side sectional view that is illustrated in the later heat protection pressure sensitive resistor module as shown in Figure 1 of thermal response switch action.
Fig. 4 is the vertical view of heat protection pressure sensitive resistor module as shown in Figure 1.
Fig. 5 is the section visualization view of the design of another heat protection pressure sensitive resistor module with mechanical type failure indicator.
Fig. 6 is the end view that is illustrated in the later heat protection pressure sensitive resistor module as shown in Figure 5 of thermal response switch action.
Fig. 7 adopts the section visualization view of light-emitting diode as the design of the heat protection pressure sensitive resistor module of indicator light.
Fig. 8 is the section visualization view of design that has the heat protection pressure sensitive resistor module of the attachment plug of using for external photoelectrical coupler electric current.
Fig. 9 is the assembling schematic diagram of metal-oxide varistor.
Figure 10 is the propeller of band compression spring and wedge shape extinguisher and the visualization view that the top prolongation is arranged.
Figure 11 is the outline drawing of the heat protection pressure sensitive resistor module of preferred specific embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail, therein, what stated is for preferred embodiment purpose of the present invention is described, rather than in order to limit above-mentioned purpose.Fig. 1 is the visualization view that the section of heat protection pressure sensitive resistor module of the preferred specific embodiment of invention decomposes.
In described preferred embodiment; heat protection pressure sensitive resistor module 10 comprises the metal-oxide varistor (hereinafter to be referred as MOV) 11 that is placed within the shell 15; thermal response switch assembly 16 has propeller 17 and 23,24 compositions of two conductive pins of spring and wedge shape extinguisher.MOV 11 is in advance through preparing, two sheet metal electrode 11b, 11c is welded to them on two silver electrodes of MOV11 by the soft soldering mode, and applies moistureproof coat 30, and the conducting terminal 12a that first sheet metal electrode 11b of MOV goes up the weak point that forms stretches out coat.Whole casing 15 is made up of lid 13 and base 14.The shape of MOV11 is a rectangle, and therefore, base 14 and lid 13 internal cavities that forms that is bonded together also is a rectangle.Erect a smooth dividing plate 14a on the bottom surface of base 14 perpendicular to the bottom surface, the central design of dividing plate 14a has a hole 14b, guiding rail 22 of design on first plane 34 of dividing plate 14a, second plane 35 of dividing plate 14a is used for constituting part in the chamber of assembling MOV 11 and second conductive pin 23, and conductive pin 23 reaches the outside by the hole 23a on the base 14; During assembling, short conducting terminal is stretched out dividing plate 14a from the hole 14b of dividing plate 14a central authorities first plane; First plane of dividing plate 14a is used for assembling thermal response switch 16, part in the chamber of formed first conductive pin 24 of prolongation of the propeller 17 of band spring and wedge shape extinguisher and conduction linking arm with resilience 21 and conduction linking arm 21, conductive pin 24 reaches the outside by the hole 24a on the base 15.When two short and small protuberances 41 by base 14 both sides were bonded together in fast lock mode with corresponding two lockholes 42 in shell 15 both sides, dividing plate 14a was separated into two adjacent cavitys 18 to the inside of shell 15.Be numbered 19 first cavity on accompanying drawing, another is numbered 20 second cavity.
Speak of thermal response switch assembly 16 now, thermal response switch assembly 16 is by a slice conduction linking arm 21 with resilience, and the short conducting terminal 12a of first of low melting point pad 29 and MOV 11 forms; By low melting point pad 29 short conducting terminal 12a and conduction linking arm 21 are linked together, constitute a normally closed switch, the contact of this switch is exactly a low melting point pad 29.The material of low melting point pad 29 is by non-harmful metal material, does not for example contain that materials such as lead or cadmium constitute, and its fusion temperature is between 100 ℃ to 165 ℃;
Speak of the assembling of the propeller 17 of band spring and wedge shape extinguisher now, the guiding projection 17e of the wedge shape extinguisher 17a of the propeller 17 that has spring and wedge shape extinguisher is embedded in the groove of the guiding rail 22 on the dividing plate 14a, on the cylindrical extension 17d of the lower end of the propeller 17 of wedge shape extinguisher, put compression spring 17b, and the cylindrical extension 17d that makes the propeller lower end is by the hole on the base 25, like this, the propeller 17 that has spring and wedge shape extinguisher is just just in time aimed at above-mentioned low melting point pad 29.
When heat protection pressure sensitive resistor module 10 is worked under normal condition of work, because MOV 11 works under the condition of E Da, can not produce undue heat, therefore also can not make the contact 29 softening or fusings that the thermal response switch assembly 16 of good thermal coupling is arranged with MOV 11, the contact of thermal response switch assembly 16 remains normally closed state; Has only the abnormal overvoltage of working as, when surge overstress such as unusual overcurrent are applied on the MOV 11, the leakage current of MOV 11 may increase, the threshold voltage of MOV 11 may reduce, cause the temperature of MOV 11 itself more and more higher, the temperature rise that MOV 11 is produced, mode by the heat transmission, the short conducting terminal 12a of first that makes by first sheet metal electrode 11b temperature transfer on the low melting point pad 29 of thermal response switch assembly 16, make this pad 29 softening or fusings, under the acting in conjunction of the restoring force of the compression spring of conduction linking arm 21 with resilience and propeller 17, form a gap 33; At this moment, the propeller 17 of wedge shape extinguisher moves up and enters into gap 33, the arc extinction in the gap 33; Because the action of thermal response switch assembly 16 makes the whole heat protection pressure sensitive resistor module 10 and the electrical network of power supply break away from, the electric energy of not reentrying, thereby, just can prevent catching fire of heat protection pressure sensitive resistor module 10.
Speak of golden oxide voltage-sensitive resistor (MOV) 11 now, though in preferred embodiment as shown in Figure 1, should be mentioned that the MOV of rectangle,, the shape of MOV 11 also can be columniform.At this selected metal-oxide varistor mainly by zinc oxide, bismuth oxide, cobalt oxide, nickel oxide, manganese oxide.Oxides such as antimony oxide are as submember, through the manufacturing process of electron-like pottery, above-mentioned metal oxide powder is fully mixed, after the grinding, be shaped to the base substrate of cylindrical shape sheet or rectangular sheet, again the sintered body of making through sintering that the voltage-sensitive characteristic is arranged; In order to switch on and to be connected lead-in wire, generally need on two surfaces of sintered body, silver electrode be set; Common varistor is behind welding lead on the silver electrode, seals, and so just constitutes a complete varistor.In the specific embodiment of the present invention, be preferably in and adhere to the sheet metal electrode on the silver electrode, be used for increasing electricity and conductivity heat.MOV is a kind of voltage sensitive element, and its resistance value changes with the surge at the two ends that are applied to it, and it has a threshold voltage value, and people are called pressure sensitive voltage to it, and usually, this pressure sensitive voltage is the terminal voltage that flows through direct current 1 MAH of MOV.When the voltage that applies at the MOV two ends was lower than threshold voltage, MOV was " closed condition " of high resistant, and when being higher than threshold voltage, MOV is " conducting state " of low-resistance, and the electric current that flows through in MOV increases with regard to exponentially formula ground.Utilize this valuable characteristic to suppress overvoltage, lightning overvoltage for example, switching manipulation overvoltage etc.But, when if this metal-oxide varistor is subjected to above the voltage surge of its rated value or current surge stress, make the temperature of MOV itself more and more higher, threshold voltage reduces, constantly obtain electric current from power supply grid, thereby reach MOV encapsulating material burning-point and catch fire, cause it around combustible also catch fire.This just needs, and hot disengaging measure prevents because the accident of the varistor initiation fire that had lost efficacy.In the present invention, even the threshold voltage of MOV changes a voltage range than broad, the shell that can design corresponding size holds MOV.Therefore, the applied range of this heat protection pressure sensitive resistor module 10.
Speak of another embodiment now, referring to Fig. 5, basic identical in this embodiment and above-mentioned preferred embodiment shown in Figure 1; Just in order to make heat protection pressure sensitive resistor module 10 have the function of operating state indication; columniform cue mark 17c of tip designs at the propeller 17 that has spring and wedge shape extinguisher; and in the hole of corresponding Position Design on the top of lid; the hole 26 that is called the lid top makes it to allow columniform cue mark 17c be projected into the top of shell 15 from this hole 26.Coat eye-catching redness can for the exposed portions serve of cue mark 17c,, represent that this MOV 11 had lost efficacy if cue mark 17c protrudes from the top.Fig. 6 is illustrated in the end view that 16 actions of thermal response switch assembly have later the heat protection pressure sensitive resistor module 10 of operating state deixis.
Also have an embodiment, referring to Fig. 7, also basic identical with above-mentioned preferred embodiment shown in Figure 1 in this embodiment; Just at the circuit of the dropping resistor 37 of light-emitting diode of top assembling 36 series connection on first plane of dividing plate 14a, two sheet metal electrode 11b from MOV 11, a lead 39 is respectively drawn on the 11c surface, 40, a lead is connected to a lead-in wire (lead does not draw in the accompanying drawing) of light-emitting diode 36, another root lead is connected to a lead-in wire (lead does not draw in the accompanying drawing) of dropping resistor 37, light-emitting diode 36 stretches out from the hole 26 on the lid, constitutes the operating state indicating mode of another kind of MOV 11.Obviously, under normal condition, light-emitting diode 36 is lighted, and after 16 actions of thermal response switch assembly, light-emitting diode 36 just extinguishes.
An embodiment is arranged again, referring to Fig. 8, also basic identical with above-mentioned preferred embodiment shown in Figure 1 in this embodiment; Be exactly in the position of assembling light-emitting diode, assemble a plug 38 that has two latches at least; Respectively draw the latch that a lead 39 or 40 (lead does not draw the accompanying drawing) is connected respectively to plug 38 from two sheet metal electrode surfaces of MOV 11.This design is that the user prepares, and the user can realize distal structure by being connected by the remote warning circuit of photoelectrical coupler (not figuring) formation with socket that plug 38 is complementary.
Narrated the specific embodiment of the present invention in front, only be for illustrative purposes, these narrations, should be appreciated, if do not break away from the many changes and the change of spirit of the present invention and purpose, then all may be familiar with the operator and put into practice, but should be understood that by those, be noted that change and change that all are such may be still in claimed ranges of the present invention.
Claims (13)
1. a heat protection pressure sensitive resistor module comprises the shell of being made up of base and lid, metal-oxide varistor, thermal response switch, conductive pin; It is characterized in that described heat protection pressure sensitive resistor module is by a metal-oxide varistor; A shell of forming by lid and base; A thermal response switch assembly; Propeller and two conductive pins that have spring and wedge shape extinguisher are formed; On two silver electrode surface of described metal-oxide varistor, weld first sheet metal electrode and second sheet metal electrode respectively by the mode of soft soldering, the conducting terminal that on the first sheet metal electrode surface of metal-oxide varistor, has first weak point that is connected with above-mentioned thermal response switch assembly, prolongation on second sheet metal electrode surface forms second conductive pin by base, and described metal-oxide varistor also has moistureproof coating; The middle part of described base has perpendicular to dividing plate of base plane, and when lid engaged with base, described dividing plate was separated into two adjacent cavitys to inner cavity, and they are respectively first cavity and second cavity; Described second cavity holds metal-oxide varistor and its second conductive pin, described second conductive pin reaches the outside by the hole on the base, described first cavity holds described thermal response switch assembly and first conductive pin one, and described first conductive pin reaches the outside by the hole on the base; The normally closed contact of described thermal response switch assembly is a pad that is made of eutectic solder, this pad welds together first above-mentioned short conducting terminal and conduction linking arm on the switch of a normally closed electricity of formation, therein, the prolongation of conduction linking arm is exactly first conductive pin; When in the power supply electric surge protective device, using the metal crimp sensitive resistor, usually described two conductive pins of above-mentioned heat protection pressure sensitive resistor module are connected between phase line and the ground wire or the neutral line; If metal-oxide varistor is subjected to the effect of overstress, the characteristic of metal-oxide varistor may be degenerated, cause leakage current to increase, threshold voltage reduces, this metal-oxide varistor is constantly obtained electric current from power supply, and the temperature of itself is raise, and this temperature rise reaches on the pad of thermal response switch assembly by transmission, when reaching the predetermined softening point of eutectic solder, described thermal response switch assembly conducted electricity linking arm default resilience force and disconnect; The described propeller part that has spring and a wedge shape extinguisher can be on being in base be slided in the groove of the guiding rail of upright position by directed ledge itself, make it just in time to aim at above-mentioned low melting point pad, when this pad is softening, because the effect of the resilience force of compression spring, propeller moves up, impel pad easier separately, the wedge shape extinguisher part on above-mentioned angle of rake top just is inserted between the formed gap of gap of pad, plays the effect of the electric arc that goes out.
2. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; the shape that suppresses the element metal-oxide varistor of surge can be a rectangle; also can be columniform; mode by soft soldering is two sheet metal electrodes; be connected on the silver electrode on two sides of described metal-oxide varistor; the conducting terminal that a weak point is arranged on described first sheet metal electrode surface, the prolongation of second above-mentioned sheet metal electrode surface constitutes second conductive pin of above-mentioned varistor.
3. according to the heat protection pressure sensitive resistor module described in the right of asking for 1, it is characterized in that above-mentioned metal-oxide varistor is to use epoxy resin or silicon rubber or silicones, as moistureproof coating.
4. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; described thermal response switch assembly is by conduction linking arm with resilience, and the conducting terminal of the above-mentioned weak point on first above-mentioned sheet metal electrode surface of above-mentioned low melting point pad and above-mentioned metal-oxide varistor constitutes.The prolongation of above-mentioned conduction linking arm with resilience stretches out first conductive pin that above-mentioned base becomes above-mentioned heat protection pressure sensitive resistor module.
5. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; the contact of above-mentioned thermal response switch assembly is to be that low-melting solder of 100 ℃ to 165 ℃ constitutes by a kind of fusion temperature; and; above-mentioned low-melting alloy is by a kind of non-harmful; for example, not containing materials such as lead or cadmium makes.
6. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; the angle of rake wedge shape extinguisher part that has spring and a wedge shape extinguisher can be on being in base be slided in the groove of the guiding rail of upright position by guiding projection branch itself; make it just in time to aim at above-mentioned low melting point pad; just in time aim at the position of low-melting alloy pad; can insert between the gap that forms after disconnecting, play the arc extinguishing effect.
7. according to the heat protection pressure sensitive resistor module described in the right of asking for 1, it is characterized in that the above-mentioned angle of rake spring that has spring and wedge shape extinguisher is a kind of compression spring, above-mentioned compression spring housing on the cylinder prolongation of propeller lower end.
8. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; the insulating material that the above-mentioned angle of rake wedge shape extinguisher that has spring and wedge shape extinguisher partly is a kind of electricity is made, and above-mentioned insulating material can be a flame retardant plastics, also can be ceramic material.
9. as the 1st said heat protection pressure sensitive resistor module of the right of asking for; therein; the metal-oxide varistor that suppresses surge is placed in the interior second above-mentioned cavity of above-mentioned shell; the propeller and the thermal response switch that have spring and wedge shape extinguisher are placed in interior described first cavity of above-mentioned shell; these two cavitys are separated by a dividing plate; a hole is arranged on the above-mentioned dividing plate; make the conducting terminal of the weak point on first sheet metal electrode surface of metal-oxide varistor; can reach the adjacent first above-mentioned cavity by the hole on the aforementioned barriers, constitute the part of above-mentioned thermal response switch.
10. according to the heat protection pressure sensitive resistor module described in the right of asking for 1; it is characterized in that; above-mentioned base two side positions have designed a short and small protuberance respectively, have designed a lockhole respectively at the both sides of above-mentioned shell lower position, in fast lock mode lid are locked on the base.
11. according to the heat protection pressure sensitive resistor module described in the right of asking for 1, it is characterized in that, in columniform cue mark part of the above-mentioned angle of rake tip designs that has spring and wedge shape extinguisher, and make a hole that columniform prolongation exposes base in the propeller lower end; When in the power supply electric surge protective device, using metal-oxide varistor, usually two above-mentioned conductive pins of above-mentioned heat protection pressure sensitive resistor module are connected between phase line and the ground wire or the neutral line, if metal-oxide varistor is subjected to the effect of overstress, the characteristic of metal-oxide varistor may be degenerated, leakage current increases, threshold voltage reduces, this metal-oxide varistor is constantly obtained electric current from power supply, the temperature of itself is raise, this temperature transfer is to the pad of thermal response switch assembly, when reaching the predetermined softening point of eutectic solder, the thermal response switch assembly conducted electricity linking arm default resilience force and disconnect; The above-mentioned propeller part that has spring and a wedge shape extinguisher can be on being in base be slided in the groove of the guiding rail of upright position by guiding projection branch itself, make it just in time to aim at above-mentioned low melting point pad, when this pad is softening, because the effect of the resilience force of above-mentioned compression spring, propeller moves up, impel above-mentioned pad easier separately, the wedge shape extinguisher part on above-mentioned angle of rake top just is inserted between the formed gap of gap of pad, play the effect of the electric arc that goes out, simultaneously, when above-mentioned propeller moves, the columniform cue mark part of above-mentioned propeller upper end reaches the outside of above-mentioned shell by the hole on above-mentioned lid top, constitute a mechanical type mode indicator, for eye-catching, can partly apply a kind of eye-catching color to above-mentioned cue mark, for example red, when above-mentioned cue mark exposes, demonstrate above-mentioned thermal response switch assembly and move, and the expression heat protection pressure sensitive resistor lost efficacy; Simultaneously, if the user utilizes the columniform extension of above-mentioned propeller lower end to assign to trigger the sensitive switch that is assemblied in the electricity on circuit board or the mounting plate, when above-mentioned propeller moves up, originally pressing the columniform prolongation of propeller bottom of button of the sensitive switch of electricity, no longer make the button pressurized of the sensitive switch of electricity, conversion takes place in the changeover contact of sensitive switch inside of electricity immediately, thereby remote alarm signal is sent in action that can control relay.
12. according to the heat protection pressure sensitive resistor module described in the right of asking for 11; it is characterized in that; it also can be the mode indicator that constitutes by light-emitting diode; on the surface of the dividing plate of the first above-mentioned cavity side, be equipped with one by indicator light that suitable dropping resistor constitutes of light-emitting diode series connection; a lead-in wire of light-emitting diode is connected to first sheet metal electrode surface of above-mentioned metal-oxide varistor; and a lead-in wire of dropping resistor is connected to second sheet metal electrode surface of above-mentioned metal-oxide varistor, is used to refer to metal-oxide varistor and whether has voltage.When the pad of above-mentioned thermal response switch assembly disconnected, indicator light extinguished, and represents that this heat protection pressure sensitive resistor module lost efficacy.
13. according to the heat protection pressure sensitive resistor module described in the right of asking for 11; it is characterized in that; can also on the first above-mentioned sheet metal electrode of above-mentioned metal-oxide varistor and above-mentioned second sheet metal electrode surface, draw a lead respectively to the attachment plug that has two latches at least on the top of above-mentioned lid, can in above-mentioned attachment plug, realize remote alarm by external optocoupler circuit.
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| CN200810088691XA CN101261893B (en) | 2008-04-14 | 2008-04-14 | Heat protection pressure sensitive resistor module |
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