CN1007100B - Thermobreaker protected auto-regenerable condenser and mfg. process thereof - Google Patents

Abstract

The present invention relates to a method for making self-healing capacitors. Metallic layers (6, 7, 8, 9) are coated on insulation strips (3, 4) before the insulation strips are wound, the metallic layers which are a certain distance away from the edges of the insulation strips are two edges of a strip (5) with regular average thickness, and the average thickness of the metallic layers are reduced. Thermal circuit breakers (14, 19) are arranged in the positions of the strips of the metallic layers along the axis direction of each core, and the thermal circuit breakers are connected in series with the lead wires of cores (10, 11).

Description

Thermobreaker protected auto-regenerable condenser and mfg. process thereof

The method that the self-healing capacitor that a kind of manufacturing is made of one or more fuses is arranged.According to the method, people apply layer of metal on the dielectric material insulating tape, and the thickness of metal level each point is different with the distance of insulating tape side with this point; The fuse of will reeling at least is with in the metallization of reeling then; With contact electrode, again contact electrode is coupled together (EP-Al-109100) with lead-in wire at the fuse side.

The capacitor of Zhi Zaoing like this, instantaneous short circuit appears between opposite electrode and after because evaporation of fault place electrode metal and healing automatically.The sign that a kind of like this life of capacitors finishes is that electric pole short circuit can't be repaired.If short circuit current is big, short circuit current will melt the fuse that is connected on this circuit.In some cases, short circuit can cause that capacitor splits cruelly.Short circuit current also may be little of not melting fuse, and at this moment, near sharply heating breakdown point causes capacitor to damage.

People once capacitor body be encapsulated in one airtight, in the shell that the internal pressure effect can not be out of shape, attempt to prevent the adverse consequences of these faults.Because capacitor body damages and to be attended by venting usually, people once utilized this phenomenon to make the part distortion of shell, and an end of the silk that opens circuit just is fixed on this place, thereby when internal pressure increases, made capacitor open circuit (CH-A-472103).

People also adopted the meltable device that triggers by meltable device place environment temperature, and this device is thermal circuit beraker.Such thermal circuit beraker is placed in the shell that the device that can generate heat or element are housed, and electro-heat equipment or element are immersed in the oil.Oily free convection in the container has guaranteed that temperature is even.The inventor once repaid the thermal circuit beraker that tried in the capacitor case and was placed in the air, in the oil in (when free convection is obstructed) or the aneroid coating material.The result is that such practice is invalid.Because circuit breaker is far from fault usually.

Target of the present invention is self-healing capacitor and the manufacture method of effectively being protected by thermal circuit beraker thereof.

According to the present invention, manufacturing be may further comprise the steps by the method for the self-healing capacitor that one or more fuses are formed: apply the layer of metal layer on the dielectric material band, it is that the metal layer average thickness in zone of predetermined distance is big that on this dielectric material band one is positioned at lateral edge from band, and the metal layer average thickness of each side in this zone reduces; On the end face of above-mentioned fuse, contact electrode is set; Along each fuse axis direction, thermal circuit beraker is set at the big position of above-mentioned metal layer average thickness; Above-mentioned thermal circuit beraker is connected in series with the lead-in wire of the fuse that inserts this thermal circuit beraker; Above-mentioned contact electrode is connected with lead-in wire.

Because the metallization layer thickness of band is big, can measure the position that capacitor body damages from this band, because the resistance of conductive layer is less on this band.If this band is near the spool center, end-of-life problem herein is also outstanding especially.Because heating was generally the highest when this was in work.

Select the width and the position of this band according to the insulating tape edge, just can find out the position that dangerous fault occurs exactly in a definite position on the fuse axis direction.If thermal circuit beraker is placed at this position on the fuse axis direction, any heat of capacitor body is damaged all trigger thermal circuit beraker immediately so, even the undercurrent that causes bad heating also can make capacitor body open circuit to melt normal fuse.

Below just with reference to accompanying drawing, according to two examples of manufacture this invention is described.Fig. 1 of accompanying drawing and Fig. 2 are the 2 right width of cloth constructed profiles of different insulative band of forming capacitor body.Fig. 3 and Fig. 4 are the profiles by the capacitor of the present invention's manufacturing.

In Fig. 1 and Fig. 2, capacitor body is to constitute by coiling pair of metal insulating tape 3,4.Insulating tape 3 and 4 metal layer are uneven, but its average thickness is being with 5 both sides all significantly little, and the center line with 5 is on the plane perpendicular to the fuse axis, such as reeling on the symmetrical plane perpendicular to the fuse axis.

According to Fig. 1, the metal layer 6 with 3 and 4 is being with 5 places that a protuberance 7 is all arranged, but this processing is not unique, because in order to reach desired effects, only need increase just near the place with 5 with all metal layer average thicknesss on 3 and 4.Such as, by the metallization of Fig. 2, just can reach this effect, that is to say, less with the metallization layer thickness 8 of 5 one sides, and be with 5 itself and opposite side thickness 9 thereof bigger.The metal layer that thickness is big preferably extends to that side at insulating tape edge always at metal layer, adopt the method as Schoop, and the contact electrode as the zinc electrode is connected on here.

Self-evident, not necessarily reel with 5, but can reel in the place of having done with respect to this symmetrical plane to move at fuse symmetrical plane place perpendicular to the capacitor body axis.At this moment, the thermal circuit beraker place that must on the fuse axis direction, be moved.

Fig. 3 represents by two fuses 10 of capacitor and 11 or two row fuses 10 and 11 capacitors of forming that are contained in the shell 12 with profile type.These two fuses are assemblings in parallel.Each fuse is made with the metal layer band by Fig. 1 or Fig. 2.The position of the band that metallization layer thickness is big is between two dotted lines 5.Thermal circuit beraker 14 just is placed on mandrel 13 the insides of each capacitor axis.In mandrel 13, circuit breaker can be by air, oil or hard material around.By hard material around situation under, circuit breaker 14 can with a sleeve pipe or protective sleeve around.Shell 12 can be filled by hard insulation 15.

The working temperature of a little higher than capacitor of fusion temperature of thermal cutout, such as 10 ℃, if perhaps the coating of capacitor body or dipping require the temperature of an a little higher than working temperature, fusion temperature is with regard to a little higher than this back one temperature so.If the heat treatment temperature of capacitor body is earlier carried out heat treatment before than higher, being preferably in so and being contained on the mandrel axis to thermal circuit beraker.

The present invention only adorns a capacitor body according to the manufacture of the best to realize in each shell.

According to the present invention, use kraft capacitor paper, the capacitor of typical media made such as polypropylene is equipped with thermal circuit beraker, and the fusion temperature of thermal circuit beraker is selected in 90 ℃～180 ℃ these scopes.In this case, circuit breaker presents thread or thicker sheet, thereby the alloy that melts when adopting these temperature is more easily made.Such alloy will contain two kinds of element: Sn, Pb, Cd, Bi and Hg of following metal at least.The alloy of fusion temperature between 90 ℃ and 180 ℃ has: 80%Hg, 20%Bi(90 ℃); 53%Bi, 33%Pb, 14%Sn(96 ℃); 54%Bi, 26%Sn, 20%Cd(103 ℃); 40%Bi, 40%Pb, 20%Sn(111 ℃), 50%Sn, 32%Pb, 18%Cd(145 ℃); 67%Sn, 33%Pb(180 ℃); 68%Sn, 32%Cd(180 ℃).The fusible link or the fuse link that constitute thermal circuit beraker preferably have enough big sleeve pipe or protective casing protection, to guarantee that conductive path disconnects really when melting.When coating circuit breaker, such sleeve pipe must be arranged with hard material.

Fig. 4 correctly illustrates the profile of adorning the capacitor that a fuse 10 makes by the present invention with 12 on a shell.

The fuse 10 of capacitor has an axial hole 13.This axial hole can be to form by the spool that takes out the wound capacitor fuse, or belongs to the insulating core axial hole of hollow of the part of capacitor body 10.

Capacitor body 10 has two termination electrodes 15 and 16 that make by metal spraying with the Schoop method as figure.The lead-in wire 17 that passes cover plate 18 is welded on the top electrode 16, and for example a fusible conductive metal sheet that makes with mock silver just is crimped between two parts 20 and 21 of normal width, to form the little part 19 of width as circuit breaker.The tip bend of part 20 is become 90 °, and the axis along capacitor body 10 all inserts axial hole 13 the insides with it then, contacts with the electrode 15 that has welded up to the crooked termination of part 20.The part 19 that width is little must be positioned at the place of the thicker fuse of metal layer.As shown in the figure, termination 21 can perhaps weld with insulator pin 22 directly as lead-in wire.The capacitor body that assembles up so just can flood suitable dielectric material with general dipping or vacuum infusion techniques.

After inserting the shell of preferably making with insulating material 12, the remaining space between capacitor and shell can be filled suitable to curable in normal temperature, or the inserts of hot curing.This inserts can form suitable thick-layer on capacitor body, and replaces cover plate 18.

Under the situation of fuse fusing, the such inserts of like oil does not cause the fuse irregular working, just any measure is not taked in the coating of the part 19 of fuse link.Under opposite situation, the protective sleeve that the part 19 of fuse link can be used for showing around, stop the Metal Contact of inserts and part 19.

Claims (4)

1, make the method for the self-healing capacitor of forming by one or more fuses, it is characterized in that may further comprise the steps:

Apply the layer of metal layer on the dielectric material band, it is that the metal layer average thickness in zone of predetermined distance is big that on this dielectric material band one is positioned at lateral edge from band, and the metal layer average thickness of each side in this zone reduces;

On the end face of above-mentioned fuse, contact electrode is set;

Along each fuse axis direction, thermal circuit beraker is set at the big position of above-mentioned metal layer average thickness;

Above-mentioned thermal circuit beraker is connected with the lead-in wire of the fuse that inserts this thermal circuit beraker;

Above-mentioned contact electrode is connected with lead-in wire.

2, the capacitor of making according to the method for claim 1.

3, the capacitor of making according to claim 1 is characterized in that, thermal circuit beraker is fuse or molten band.They are to be made by the alloy that at least two kinds of elements in the following metal constitute: sn, pb, cd, Bi, Hg.

According to the capacitor of claim 3, it is characterized in that 4, thermal circuit beraker is the fuse piece (19) of arrowband.