CN101042952B - Varistor with novel short-circuit protection device - Google Patents
Varistor with novel short-circuit protection device Download PDFInfo
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- CN101042952B CN101042952B CN2007100975459A CN200710097545A CN101042952B CN 101042952 B CN101042952 B CN 101042952B CN 2007100975459 A CN2007100975459 A CN 2007100975459A CN 200710097545 A CN200710097545 A CN 200710097545A CN 101042952 B CN101042952 B CN 101042952B
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Abstract
A type of piezoresistance equipped with new type short protecting device, the piezoresistance is parallel connected with the new type short protecting device, the short protecting device is hot melt body which at least includes two parts, thereinto at least one part is hollow part, the other part is solid part; the short protecting device includes insulator base noumenon, thermal deformation material subassembly, electrode, insulator outer cover; the insulator base includes through hole which is used to mount thermal deformation material subassembly and several mounting holes which is used tomount the insulator outer cover; the insulator base is equipped with fixed metal electrode; the thermal deformation material subassembly includes little conduit and big cannula which is set with thermal deformation material, temperature controlling weldable fusible alloy which is used to fill in the cavity of big cannula, the insulator outer cover includes protruding foot which matches with number and diameter of mounting hole and groove which spreads the insulator base noumenon. The invention is close mode protection, the structure is simple, and the safety is well, energy-saving, consummation is decreased, environmental protection, the operation is stable, and it is easy to detect; The efficiency is high, cost is low, and the service life is long.
Description
Technical field
The present invention relates to a kind of electric component, particularly a kind of piezo-resistance with short-circuit protection.
Background technology
Develop rapidly along with the hyundai electronics electrical technology, increasing electronic electric equipment (as: electronic equipment, the network equipment, household electrical appliance, electric power, electric, medical, computer integrate circuit or the like) is widely used in each field, meanwhile, these electronic electric equipments all have been subjected to the surge current of lightning surge natural calamity and various electromagnetic interference, the infringement of surge voltage without exception, cause these equipment can't operate as normal, can catching fire when serious, blast etc.
The effective way that addresses the above problem is at the input of these equipment one or more groups MOV Zinc-oxide piezoresistor in parallel, to play the external various surge currents and the effect of surge voltage of absorbing, thereby protected the equipment of rear end, solved the surge infringement problem of electronic equipment; But, because the MOV Zinc-oxide piezoresistor is a kind of semiconductor device, its fatal weakness is arranged, when it can produce inefficacy during at overvoltage or heavy current impact, it self can produce burning, blast when losing efficacy, thereby caused that fire causes great economic loss, therefore, must also safeguard measure be to implement to piezo-resistance itself, its self-heating, burning prevented; But, open a way sometimes during pressure responsive resistor failure, sometimes not exclusively short circuit; has bigger uncertainty; add existing technical restriction, piezo-resistance is implemented protection just have considerable technical difficulty, this also is that numerous piezo-resistance producer fails the difficult problem resolved for many years.
China is an energy starved country, is again simultaneously an energy-consuming big country.Economic growth and urbanization fast development are to energy supply and utilize mode to propose severe challenge.Rarely seen in the history growing continuously and fast appearred in the electricity needs of China in recent years, imbalance between supply and demand is outstanding, because electricity shortage, so the research and development of new product that relate to electricity for electric power, electronic equipment, the network equipment, household electrical appliance etc. become the top priority of manufacturer, greatly develop energy-saving and environmental protection, green product, advance electric energy-saving, significance is arranged for solving the China's energy problem.So the Party Central Committee is with " energy development and saving develop simultaneously, and save first " the strategic state basic policy as current social development, each enterprise is all around this central point development.
Piezo-resistance overheat protective technology of the prior art mainly contains following several:
1, thermal fuse technology.This technology is that the low-melting-point metal with the wax protection is contained on the piezo-resistance by certain technology; excessive at the piezo-resistance leakage current, when temperature is elevated to a certain degree; low-melting-point metal fusing; thereby piezo-resistance is excised from circuit; can prevent the piezo-resistance catching fire effectively; but there is integrity problem in thermal fuse, and has only 5 years q-percentile life in the environment of heat cycles approximately.In the environment of thermal cycle, thermal fuse need regularly replace keeping normal operation, this infrastructure cost height, and the maintaining difficulty is bigger, has brought certain tired scratching to the user.
2, utilize spring to hold the low melting point welding technology.This technology is the technology that the votage limit type SPD of present most lightning protection device producer adopts, pin place in piezo-resistance increases a low-melting scolding tin contact, with a spring solder joint is held then, excessive at the piezo-resistance leakage current, when temperature is elevated to a certain degree, the scolding tin fusing of pad, pad separates rapidly under the tension of spring, thereby piezo-resistance is excised from circuit, the contact of interlock alarm simultaneously, send alarm signal, because low-melting-point metal can flow and produce the crack at stress point, the scolding tin that is in the low melting point pad in the spring tension can flow and produce the slit equally, therefore, the greatest problem of this device is that scolding tin can wear out, thereby causes device to disconnect without reason.Simultaneously, extension spring is in stress for a long time, lose elastic force easily, device can't disconnect, and has again, and this kind structure is being produced and the user can only manual welding when using, production efficiency is less than original 5%, for the piezo-resistance of same batch of production,, thereby the consistency of product existing problems have been caused again owing to the difference of soldering tin amount and the dispersiveness of extension spring power.The piezo-resistance unstable working condition of this structure, the cost height can not be effectively, play a protective role reliably.
3, Thermal Cutoffs technology.This technology is meant is in the same place piezo-resistance and Thermal Cutoffs Series Package; utilize heat conduction that leakage current is conducted on the Thermal Cutoffs at the heat that produces on the piezo-resistance; when temperature is elevated to the design temperature of Thermal Cutoffs; Thermal Cutoffs fusing; piezo-resistance is excised from circuit; Thermal Cutoffs is except having life-span and integrity problem equally; utilize Thermal Cutoffs that piezo-resistance is carried out overtemperature protection and also have following problem: heat conduction path is long; response speed is slow excessively; heat is to pass to the Thermal Cutoffs housing by certain insulating material earlier on its structure; and then pass to the inside packing material of Thermal Cutoffs; just pass on the melt of Temperature protection at last; therefore, determined that the response speed of Thermal Cutoffs is slow.Simultaneously since the diameter of Thermal Cutoffs less than the diameter wire of piezo-resistance, thereby reduced piezo-resistance key property parameter (reduction of through-current capability), in addition, because series system has caused the increase of the lead-in inductance amount of piezo-resistance, thereby has limited the use of piezo-resistance in the high frequency field.
4, isolation technology.This technology is contained in piezo-resistance in the airtight box body, prevents spreading of piezo-resistance smog and flame.Under the malfunctioning situation of various backup protections; isolation technology a kind of simple and effective method of also can yet be regarded as; but box body need take bigger space; to the product needed of numerous different sizes box body one to one with it; with needs one to one mould go to produce; cost is too high; simultaneously under this kind mode; whether the user can't the fast detecting piezo-resistance lose efficacy, and had only in the slave unit and welded out, could detect with professional instrument; quite difficult; to prevent also simultaneously that smog and flame from coming up cost height, poor stability from the place of box body lead-in wire perforate.
5, sheath encapsulation technology.For prevent that piezo-resistance from can smolder, on fire and blast when losing efficacy, someone adopts this technology with sheath piezo-resistance to be encapsulated, but because piezo-resistance arcing can occur in inside when losing efficacy, cause encapsulant to lose efficacy, and production carbon, the generation of carbon can make electric arc be maintained again, tends to cause device interior short circuit and sooting like this.Experiment shows: behind the piezo-resistance cover upper jacket, the heat radiation of piezo-resistance can be affected, cause its maximum diffipation power to reduce, thereby influenced the power-frequency voltage tolerance of piezo-resistance, from another angle, heat radiation is affected and also can quickens the aging of piezo-resistance, influences the useful life of piezo-resistance.
In sum, all there are following fatal problems in the resist technology of existing piezo-resistance:
The first, reduce some key property parameters of piezo-resistance, exchange imperfect protection for as through-current capability, life-span, industrial frequency withstand voltage, high frequency characteristics to piezo-resistance, this is actually and has run counter to the original meaning of using piezo-resistance to a certain extent.
The second, these technology all are open-circuit-protection patterns when adopting pressure responsive resistor failure, and it judges that the foundation that lost efficacy is the temperature rise of piezo-resistance.Owing to structural reason has determined and must detect by the mode of temperature gradient that therefore, heat conduction is slower, respond slowlyer, simultaneously, also be subjected to the peripheral environment Temperature Influence, therefore, can not be rapidly accurately failure judgement with the initiation action message.
The 3rd, the bad adaptability of structure, the structure different, cost height to the product needed of different specification size.
The 4th, because therefore structure, manufacturing process complexity and use low melting point (about 120 degree) scolding tin, must adopt hand assembled to operate, efficient is very low.
The 5th, owing to be open circuit mode, so the user can't judge simply fast that in use whether piezo-resistance lost efficacy, and must pull down detection in the slave unit, maintenance cycle and expense height.
Therefore, there are defectives such as low-response, shock resistance are poor, consumptive material, power consumption height, job insecurity, temperature control inaccuracy in prior art; Because of himself complex structure, wide in variety, so complicated operation, failure rate is high, and work production efficiency is low, and the scope of application is little, has brought certain trouble to the client, and the maintenance of product quite bothers, and expense is higher, has limited its market segment.
Summary of the invention
The objective of the invention is to overcome the defective of prior art; the protection of a kind of closed mode is provided, rational in infrastructure, simple, security performance is good, energy-conservation, consumption reduction, environmental protection, working stability, be convenient to detect, high efficiency, cost are low, the piezo-resistance with short-circuit protection of long service life.
The objective of the invention is to be achieved through the following technical solutions:
A kind of piezo-resistance with short-circuit protection, described piezo-resistance body is in parallel with short-circuit protection, and described short-circuit protection is a hot melt; described hot melt is divided into two parts at least; wherein at least a portion is a ducted body, and another part is a solid, and described ducted body is a hollow pipeline.
Described short-circuit protection comprises: dielectric substrate body and thermal deformation material member and electrode and insulator enclosing cover; Described dielectric substrate body is provided with the through hole that is used for installing the heat deformable material assembly and several are used for installing the installing hole of insulator enclosing cover; Described dielectric substrate body also is provided with the position of fixed electrode; Described thermal deformation material member by small pipeline that is provided with the thermal deformation material and big sleeve pipe and the temperature control that is used to fill big cannula cavity can weld fusible alloy and form, described insulator is covered with outward with installing hole quantity and diameter are complementary and stretches out pin; Described insulator enclosing cover also is provided with the power supply utmost point and stretches out this external groove of dielectric substrate.
Described thermal deformation material is crosslinked polyvinylidene fluoride resin.
Described thermal deformation material is a crosslinked polyolefin resin.
The hot melting temperature of described big sleeve pipe is 75～180 ℃.
The hot melting temperature that described temperature control can weld fusible alloy is 150～230 ℃.
The caliber of described hollow pipeline is φ 0.5～10mm.
After the present invention adopts technique scheme, can reach following beneficial effect:
1, creativeness, advance.The present invention has done the improvement of science to the defective of prior art, existing piezo-resistance resist technology in normal operation, generally be that protective device is connected with piezo-resistance, when meeting improper overvoltage or piezo-resistance deterioration condition, the leakage current of piezo-resistance increases, cause self-heating, thereby the line disconnection (open circuit mode) that will cause in the protective device plays a protective role; This structural response is slow, complex structure, inductance value height; withstand voltage low, cost is high; and, needing welding, single-piece production because it is a mechanical structure, efficient is low, shock resistance is poor, the quality instability; and because the defective that himself exists; the weakness that these protective devices are the most fatal is exactly failure judgement appearance accurately and reliably, therefore, still has potential safety hazard; when losing efficacy, easily circuit is impacted.The present invention adopts special to thermo-responsive (temperature-sensitive with) with to contactless, big electric current, the high voltage bearing temperature switch of heat sensitive deformable material (action with) design, it is welded on the electrode silver face of piezo-resistance, the other end then links to each other with another contact conductor of piezo-resistance, realize the mode of connection in parallel with piezo-resistance, just often, protective device is normally open, and is non-conductive; When unusual; piezo-resistance heating itself; its heat can weld on fusible alloy and the heat deformable material by the temperature control that copper electrode arrives in the protective device rapidly; the deformation temperature T1 of heat deformable material is lower than the deformation temperature T2 that temperature control can weld fusible alloy; when the temperature of piezo-resistance body reaches T1; heat deformable material produces the pressure that can weld fusible alloy to temperature control; when temperature reaches the T2 that needs action; temperature control can weld fusible alloy and melt rapidly; by the solid-state liquid state that becomes; the heat deformable material retraction volume diminishes simultaneously; because heat deformable material volume contraction ratio is very big; it is 2: 1; the wall internal pressure that produces is far longer than the gravity that temperature control can weld fusible alloy; so no matter piezo-resistance be what position (on put; underlying; put on a left side; put on the right side) under the systolic pressure extruding of heat deformable material; make temperature control can weld fusible alloy and can only arrive another electrode tip and welding automatically along the passage of reserving; thereby realize reliable connection short circuit (connect resistance and be lower than m Ω level) with two electrodes; thereby pressure-sensitive electrical equipment has been implemented bypass; electric current no longer flows through piezo-resistance; but flow to protective device in parallel with it, and cause the electric current fuse rather than Thermal Cutoffs (the electric current insurance is reliable much rapider than the Temperature protection) fusing of major loop.Therefore; can implement accurate and reliable protection, the user can be placed into the electric current fuse influence that is not subjected to the piezo-resistance mode of connection and locational space in the major loop simultaneously, has made things convenient for user's design; thereby play the effect of protection entire circuit, have highly creative and advanced.
2, simple and reasonable for structure, efficient.The present invention has overcome the baroque defective of prior art; adopt simple structure; volume is little, thermal capacitance is little; use the high metallic copper of hot transfer efficiency as electrode; and copper electrode directly welded, the quick response of conducting heat is synchronously realized in contact piezo-resistance inner heat source; and this device and piezo-resistance directly can be in the same place with epoxy encapsulation, the volume of protective device has only 0.4cm
3About, also can be provided with forr a short time according to the needs of suitable environment, littler several times to tens times than the volume of other structure, thus it is big to have solved the existing product volume, the heat conduction distance, and response is slow, defectives such as unstable properties.
3, stable and reliable product quality.The present invention has adopted high-precision temperature control fusible alloy material and the thermal deformation sensitive material of welding, this kind alloy is a kind of special material, have melting point and solderability accurately, this material switch motion mechanism reliable, can realize accurately temperature switch control fast, switch is firmly welding automatically when action simultaneously, it is not the contact of mechanical contact, there is not oxidation, problems such as loose contact, therefore, the switch of this design has high voltage withstanding, the ability of big electric current, simultaneously, this switch motion mechanism mainly is to change conductive path by the solid-state liquid state (the own internal characteristics that belongs to material) that becomes of electric conducting material, so its action is absolute reliable.In addition, this protective device is firmly to be welded on the piezo-resistance body earlier, and therefore problem can not appear becoming flexible etc. in just encapsulated then layer encapsulation, and this overall structure improves the coefficient of safety of piezo-resistance greatly.
4, flexibility height.The present invention can be designed to arbitrary form with the combination of piezo-resistance and protective device with being connected according to the needs of suitable environment, and its fixed connection apparatus can be sheet or wire etc., installs easyly, and maintaining is more convenient.
5, economical and practical.The present invention need not follow the structure that prior art falls behind; Expand client's selection space, adapted to the requirement of social more economical practicality now.
6, attractive in appearance.The present invention is skillfully constructed, designs uniqueness, and novel structure, attractive in appearance possesses succinct, the practical esthetic requirement of modern society.
7, versatility.Short-circuit protection among the present invention only just can be used for implementing on the piezo-resistance of various different specification sizes protection with a kind of specification; therefore; kind can be concentrated unification, realize to produce in enormous quantities, and the reduction of production management, quality control, detection and production cost is all played a positive role.
8, production efficiency height.The present invention is owing to its particular structure, and mechanization production in enormous quantities simultaneously because of the stability of its work, has improved the integrated level of circuit, makes circuit more succinct reliable, has reduced the volume and weight of electronic equipment, and is with low cost.
9, energy-saving and cost-reducing.The present invention is rational in infrastructure, and volume is little, and kind is single, therefore greatly reduces material cost, and extensive production has continuously in batches significantly reduced energy consumption,
10, easy maintenance.The present invention can direct-on-line detects, and need not dismounting, and fault can be rapidly, accurately judge, whether short circuit gets final product only to need impedance between two terminal pins of measurement piezo-resistance, has made things convenient for the user.Save time, easy, efficient, reliable.
11, long service life.The present invention adopts high-strength material, its rational structure is more firm, reliable than prior art, simultaneously owing to adopt parallel-connection structure, so do not influence other characteristic of piezo-resistance, as: lead-in inductance amount, through-current capability, industrial frequency withstand voltage, maximum power dissipation etc., thereby improved the life-span of piezo-resistance and enlarged the application of piezo-resistance, have the vast market economic benefit.
Description of drawings
Fig. 1 is the stereogram of short-circuit protection among the present invention;
Fig. 2 is the parts assembly drawing of short-circuit protection among the present invention;
Fig. 3 is the cutaway view of Fig. 2;
Fig. 4 is a normal condition cutaway view of the present invention;
Fig. 5 is an operating state cutaway view of the present invention.
Description of reference numerals:
1, dielectric substrate body
1.1: the installing hole on the substrate body;
1.2: the through hole that temperature sensing material is installed on the substrate body;
1.3: the position of fixed electrode on the substrate body;
2, electrode
2.1: part is stretched out this external electrode of dielectric substrate;
2.2: electrode is in the intrinsic part of dielectric substrate;
3, electrode
3.1: part is stretched out external electrode;
3.2: electrode part in vivo;
4, the small pipeline of thermal deformation material formation
4.1: the thermal deformation material;
4.2: the big sleeve portion on the thermal deformation material;
5, temperature control can weld fusible alloy
6, insulator enclosing cover
6.1: insulator covers outward stretches out pin;
7, insulator enclosing cover
7.1: insulator covers outward stretches out pin;
8, the hollow pipeline in the thermal deformation material
9, lead
10, piezo-resistance electrode A face
11, another electrode B face of piezo-resistance
12, the leading foot that is communicated with the electrode A face
13, the leading foot that is communicated with the electrode B face
14, piezo-resistance body
14.1, short-circuit protection;
15, encapsulated layer
16, the cavity on the insulator matrix
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Referring to Fig. 1
Fig. 1 is the stereogram of short-circuit protection among the present invention.In Fig. 1; described a kind of piezo-resistance body 14 with short-circuit protection 14.1 comprises insulator matrix body 1; electrode 2 and electrode 3 stretch out from the insulator matrix body 1 interior two ends of short-circuit protection 14.1 respectively; described electrode 3 has heat transfer, conduction and the fixing function of short-circuit protection 14.1, and described electrode 2 is used for linking to each other (as shown in Figure 4) with the leading foot 13 of piezo-resistance body 14.
Referring to Fig. 2
Fig. 2 is short-circuit protection parts assembly drawing among the present invention.In Fig. 2; the insulator matrix body 1 and the insulator enclosing cover 6 of the short protective device 14.1 of described piezo-resistance body 14; 7 can be by high temperature resistant (greater than 250 ℃); fire-retardant; the PPS engineering material of insulation constitutes; also can constitute by refractory ceramics; which is provided with to be used for fixing insulator enclosing cover 6 is installed; several installing holes 1.1 of 7; the quantity of described installing hole 1.1 and diameter and insulator enclosing cover 6; 7 stretch out pin 6.1; 7.1 quantity and diameter be complementary; be provided with the through hole 1.2 that is used for pipe laying 4 at the center of insulator matrix body 1; described pipeline 4 is made by heat deformable material 4.1; described through hole 1.2 is complementary with the diameter of pipeline 4; described thermal deformation material 4.1 is crosslinked polyvinylidene fluoride resin or crosslinked polyolefin resin; above-mentioned material is a kind ofly to have the extremely sensitive contraction of heat; insulation; high-intensity material; also be provided with the groove position 1.3 that is used to install and fix electrode 2.2 on the both ends of the surface of insulator matrix body 1, this electrode 2.2 is that the metal copper sheet by last tin constitutes.Be Sn in order to what be filled in big sleeve pipe 4.2 inner chambers among the present invention, Bi, the temperature control of main components such as In preparation can weld fusible alloy 5, and it is adjustable that this alloy has temperature-controlled precision ± 2 ℃ temperature, and fusing is less than 60S fast, the key property function such as can weld.
Its assembling flow path is: controllable temperature fusible alloy 5 is put into big sleeve pipe 4.2 on the heat deformable material, then heat deformable material 4.1 is put into through hole 1.2 is installed, again electrode 2 and electrode 3 are put into the position 1.3 of fixed electrode on the insulator matrix body 1,1.4 (fixed electrode position 1.4 is similar with fixed electrode position 1.3 on the matrix on the matrix, other end at insulator matrix body 1) blocks on, at last, with stretching out in the installing hole 1.1 (can be several) that is complementary with it on the corresponding insertion of pin 6.1 and 7.1 (can be several) the insulator matrix body 1 of insulator enclosing cover 6 and insulator enclosing cover 7, implement close-fitting, get product.
Referring to Fig. 3
Fig. 3 is the cutaway view of Fig. 2.In Fig. 3; the short-circuit protection 14.1 of described piezo-resistance 14 is divided into two parts at least; wherein at least a portion is a hollow pipeline 8; another part can weld meltable golden 5 solid for filling; described temperature control can weld fusible alloy 5 and tightly be entangled by thermal deformation material 4; and be fixed in the through hole 1.2 of the installation temperature sensing material on the insulator matrix body 1; can't become flexible; end face that temperature control can weld fusible alloy 5 closely contact with part 3.2 in the electrode body of electrode 3, and other end and electrode 2 reach the small pipeline wall 4 that is formed by heat deformable material 4.1 in the intrinsic part 2.2 of insulator matrix and surround hollow pipeline 8.
Referring to Fig. 4
Fig. 4 is a normal condition cutaway view of the present invention.In Fig. 4; short-circuit protection 14.1 is positioned on the electrode A face 10 of piezo-resistance body 14; then electrode 3 is welded on the electrode A face 10; realize that short-circuit protection 14.1 is communicated with the leading foot 12 of piezo-resistance body 14; simultaneously; finished short-circuit protection 14.1 has been securely fixed on the body of piezo-resistance 14; electrode 2 is connected by lead 9 with another leading foot 13 of piezo-resistance body 14; thereby finish short-circuit protection 14.1 and 14 liang of leading foots 12 of piezo-resistance; 13 reliable parallel connection; after with encapsulated layer 15 piezo-resistance 14 and short-circuit protection 14.1 being sealed curing at last; just form piezo-resistance body 14 with short-circuit protection 14.1; described encapsulated layer 15 can be high-temperature-resistant epoxy resin or pottery, also can be other exotic materials.
The present invention normally the action before since electrode 2 be positioned at body interior divide 2.2 and temperature control can weld the air distance that fusible alloy 5 has 2～5mm apart, therefore, electrode 2 and electrode 3 are in normally open, do not flow through electric current.
The present invention just can change the proof voltage size of this device as long as change the air length partly of the hollow pipeline 8 of short-circuit protection 14.1, and this length range can be 0.5～10mm.
Referring to Fig. 5
Fig. 5 is an operating state cutaway view of the present invention.Under the normal condition; the leakage current of piezo-resistance 14 flows to the leading foot 13 that is communicated with the electrode B face from the leading foot 12 that is communicated with the electrode A face by piezo-resistance body 14; this leakage current is very little; has only microampere order; be not sufficient to cause the temperature rise of piezo-resistance body 14; when leakage current begins to increase gradually; at this moment; piezo-resistance body 14 causes the temperature of piezo-resistance body 14 to raise because of the increase of this leakage current; because electrode 3 is copper electrodes; has excellent thermal conducting function; and has certain area because of electrode 3; and it has good thermoelectricity with piezo-resistance body 14 and contacts; so this heat divides 3.2 rapidly to be passed to thermal deformation material 4.2 synchronously and coupled temperature control can weld on the fusible alloy 5 by electrode 3 in body interior; when temperature rises to the deformation temperature T1 of thermal deformation material 4.1 (75～180 ℃); big sleeve pipe 4.2 parts of thermal deformation material begin deformation and shrink; when rising to (150～230 ℃) to weld the fusion temperature T2 of fusible alloy 5 to temperature control the time; temperature control can weld fusible alloy 5 and melt rapidly; by the solid-state liquid state that becomes; under the T2 temperature; thermal deformation material 4 finally shrinks; under the pressure of thermal deformation material 4, flow to hollow pipeline 8; arrive electrode 2; and implement to weld automatically; temperature control can weld fusible alloy 5 mobile this straight tubes that fill up; thereby with electrode 3 and electrode 2 short circuits; short-circuit resistance is less than m Ω level; and with two leading foots 12 and 13 short circuits of piezo-resistance body 14; to the alter course mode of flow path 12-10-3-2-9-13 of this after-current; it no longer is the 12-10-14-11-13 path; electric current no longer flows through piezo-resistance body 14; thereby the problem that will produce temperature rise solves at all; simultaneously; because the short circuit of short-circuit protection 14.1 of the present invention action can be flow through bigger short circuit current; this electric current causes being placed on the electric heating blown fuse on the major loop at piezo-resistance body 14 places; cut off current supply circuit; thereby realized the protection fully to load or piezo-resistance body 14, deformation becomes straight pipeline state among Fig. 5.
The present invention only needs to detect between the pin 12 and 13 whether short circuit with universal instrument, can judge just whether this piezo-resistance 14 lost efficacy, and is convenient, fast, reliably, just can change the maximum current that flows through this device as long as change the caliber of hollow pipeline 8, the scope of caliber can be φ 0.5～10mm.
Other technologies of the present invention can adopt prior art.
Most preferred embodiment of the present invention is illustrated, and any improvement that those of ordinary skill in the art makes according to the present invention all falls into protection scope of the present invention.
Claims (8)
1. piezo-resistance with short-circuit protection, it is characterized in that: described piezo-resistance body (14) is in parallel with short-circuit protection (14.1), described short-circuit protection (14.1) is a hot melt, described hot melt is divided into two parts at least, wherein at least a portion is a ducted body, another part is a solid, described ducted body is hollow pipeline (8), the caliber of described hollow pipeline (8) is φ 0.5～10mm, described short-circuit protection (14.1) comprising: dielectric substrate body (1) and thermal deformation material member and electrode (2,3) and insulator enclosing cover (6,7); Described insulator matrix body (1) is provided with through hole (1.2) and several installing holes (1.1) that is used for installing insulator enclosing cover (6,7) that is used for installing the thermal deformation material member; Described insulator matrix body (1) also is provided with the position (1.3) of fixed electrode (2,3); Described thermal deformation material member by small pipeline that is provided with thermal deformation material (4.1) (4) and big sleeve pipe (4.2) and the temperature control that is used to fill big sleeve pipe (4.2) inner chamber can weld fusible alloy (5) and form, described insulator enclosing cover (6,7) be respectively equipped with installing hole (1.1) quantity and diameter are complementary and stretch out pin (6.1,7.1); Described insulator enclosing cover (6,7) also is provided with the power supply utmost point (2,3) and stretches out the outer groove (1.3) of insulator matrix body (1).
2. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: described thermal deformation material (4.1) is crosslinked polyvinylidene fluoride resin.
3. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: described thermal deformation material (4.1) is a crosslinked polyolefin resin.
4. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: the hot melting temperature of described big sleeve pipe (4.2) is 75～180 ℃.
5. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: the hot melting temperature that described temperature control can weld fusible alloy (5) is 150～230 ℃.
6. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: described insulator matrix body (1) and insulator enclosing cover (6,7) are the PPS engineering material.
7. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: described insulator matrix body (1) and insulator enclosing cover (6,7) are pottery.
8. a kind of piezo-resistance with short-circuit protection according to claim 1 is characterized in that: described piezo-resistance body (14) and short-circuit protection (14.1) are outer to be provided with encapsulated layer (15), and described encapsulated layer (15) is epoxy resin or pottery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100975459A CN101042952B (en) | 2007-04-27 | 2007-04-27 | Varistor with novel short-circuit protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100975459A CN101042952B (en) | 2007-04-27 | 2007-04-27 | Varistor with novel short-circuit protection device |
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| CN101042952A CN101042952A (en) | 2007-09-26 |
| CN101042952B true CN101042952B (en) | 2011-03-02 |
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|---|---|---|---|---|
| CN101764005B (en) * | 2010-01-05 | 2013-07-03 | 中达电通股份有限公司 | Alarm type thermal fuse-link |
| CN105489560A (en) * | 2015-11-30 | 2016-04-13 | 广东百圳君耀电子有限公司 | Huskless filled and protected circuit element and manufacturing technology thereof |
| CN107578969B (en) * | 2017-10-18 | 2019-08-02 | 隆科电子(惠阳)有限公司 | A kind of safety disengaging device of MOV module temperature alloy |
| CN108896786B (en) * | 2018-09-20 | 2023-08-01 | 广东电网有限责任公司 | Fault warning device and fault warning system |
| CN115296287B (en) * | 2022-10-08 | 2023-03-24 | 四川中光防雷科技股份有限公司 | Surge protection device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072677Y (en) * | 2007-04-27 | 2008-06-11 | 甘立刚 | Piezoresistor with novel protective device for short-circuit |
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2007
- 2007-04-27 CN CN2007100975459A patent/CN101042952B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072677Y (en) * | 2007-04-27 | 2008-06-11 | 甘立刚 | Piezoresistor with novel protective device for short-circuit |
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| Publication number | Publication date |
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| CN101042952A (en) | 2007-09-26 |
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