CN87200417U - Penetrating dual-capacitor - Google Patents

Abstract

The utility model relates to a penetrating dual-capacitor having higher electric strength. In the capacitor, an insulating cover covered the conductive rod of a ceramic body passing through the capacitor is extended to exceed the lower end of the insulating cover surrounding the lower part fraction of the conductive rod, which can raise the electric strength of the capacitor.

Description

Penetrating dual-capacitor

The utility model relates to a kind of through high electric strength dual-capacitor, particularly relates to a kind of capacitor that is used for the noise filter in the high-power and high-frequency apparatus such as microwave oven, broadcast transmitter or x ray generator.

In working in the high-frequency high-power equipment of very high frequency(VHF) or UHF band, it is crucial removing the noise that overlaps on the industrial electro line of force.Therefore, the noise filter as low pass filter is linked in the power line of equipment usually.

Refer now to Fig. 1 and Fig. 2, for example United States Patent (USP) the 4th, 370, and the common through dual-capacitor of describing in No. 698 has an oval ceramic body 1, has a pair of through hole 2 and 3 in the thickness of this ceramic body 1.At the upper surface of ceramic body 1 electrode 4 and 5 of a pair of isolation corresponding to through hole is housed, at its lower surface, be equipped with corresponding to through hole altogether with electrode 6.One earthing conductor 7 has a rectangular slab 7c and a bump 7a.Plate 7c has 4 through hole 7c-1 to 7c-4, to utilize screw capacitor assembly is fixed in a filter housing (not drawing among the figure).Bump 7a has separately through hole 2 and the 3 corresponding a pair of through holes 9 and 10 with ceramic body 1, and bump 7a also is provided with a plurality of through hole 7b along its periphery line.Common electrode 6 is installed on the bump 7a of earthing conductor 7, so that hole 9 and 10 is overlapping with hole 2 and 3 respectively, and aperture 7b is positioned at the outside of ceramic body 1.A pair of elongated shape connects conductor 11 and 12 and has fin terminal 20 and 21, and the female terminal that this two fins terminal 20 and 21 is used for same external circuit (figure does not draw) is connected. Bar 11 and 12 is inserted into respectively in the hole 9 and 10 of earthing conductor 7, and in the hole 2 and 3 of ceramic body 1. Conductor rods 11 and 12 coats with the flexible insulated hose of for example being made by silicon rubber 15 and 16 respectively, so that guarantee insulation between common electrode 6 and bar 11,12.Insulated tube 15 and 16 is also as being absorbed in the shrinkage stress that is created in the filler 17 of injection in its heating and the hardening process process, and thereby prevents to take place crack etc. in the filler 17 that has hardened. Bar 11 and 12 is also through the metal cap 13 and 14 that is installed in respectively on electrode 4 and 5, and then, bar 11 and 12 is welded in cover 13 and 14 by soft soldering respectively, and cover 13 and 14 also has the bump that has a plurality of aperture 13a, 14a.The elliptical cylinder-shape vinyl cover 8 of a hollow is housed below earthing conductor 7, holds bar 11,12 and pipe 15,16 so that cover 8.The lower end of lid 8 is designed to extend beyond a little the lower end of pipe 15,16.Lid 8 is essentially oval-shaped cylinder, and the straight wall 8a of length, 8b with pair of parallel and a pair of semi-circular wall 8d and the 8e that are connected with the above-mentioned straight wall of length.Lid 8 has a 8c of bridge portion, crosses and covers 8 top, and cross-over connection is in the central authorities of straight wall 8a of above-mentioned parallel long and 8b, and like this, the separated by spaces that the 8c of bridge portion will cover in 8 is that two parts are bordering on circular regions.

Insulating packing 17(is epoxy resin for example) around ceramic body 1, cover 13,14 and bar 11,12, as shown in Figure 2.In the injection process of insulating packing 17, capacitor body covers with lid 18, and filler 17 injects by the opening that covers 8 bottoms and covers in 18 then.Therefore the insulating packing that injects from the bottom covers 18 interior zones and is filled by insulating packing 17 by being located at the aperture 7b on the earthing conductor 7 and being located at aperture 13a and the 14a that covers on 13 and 14.After the packing hardening of injecting like this, lid 18 is removed, thereby finishes the dual-capacitor assembly.Usually, electric insulation is all guaranteed by the epoxy resin that injects with the protection to oil, steam and/or dust.

Another kind of common through dual-capacitor is illustrated in (No. the 106330/85th, the open communique of reference example such as Japanese Utility Model) in Fig. 3 and 4.One oval ceramic body 31 has pair of holes 32 and 33 in its thickness, at the upper surface of ceramic body 31, the electrode 34 and 35 corresponding to a pair of isolation of through hole is installed, and, receive the lower surface of using electrode 36 altogether corresponding to through hole.One earthing conductor 37 has a rectangular slab 37c and a bump 37a.Plate 37c has four through hole 37c-1 to 37c-4, to do that capacitor is fixed in the usefulness of filter housing (not drawing among the figure).Bump 37a has and is roughly oval-shaped through hole 37b, and common electrode 36 is installed on the bump 37a of earthing conductor 37.A pair of elongated shape connects conductor 41 and 42 and is inserted into metal cap 39 and 40, hole 32 and 33, reaches elliptical aperture 37b, totally forms fin 41a and 42a in the upper end of conductor 41 and 42. Bar 41 and 42 is welded in metal cap 39 and 40 by soft soldering, and metal cap 39 and 40 are installed in respectively on electrode 34 and 35. Bar 41 and 42 is also coated by flexible insulated hose 44 and 45 respectively, with aforementioned pipe 15 and 16 same purposes is arranged.The elliptical cylinder-shape vinyl cover 38 of hollow is installed on the earthing conductor 37, so that cover 38 around bar 41 that is covered by pipe 44 and 45 and 42 bottom.In this layout, it should be noted: the lower end of lid 38 is designed to stretch out in a little the lower end of pipe 44 and 45, as shown in Figure 4.The elliptical cylinder-shape vinyl cover 43 of another hollow also is installed on the earthing conductor 37, so that it is around ceramic body 31, cover 39 and 40 and the top of bar 41 and 42, as shown in Figure 4.

Epoxy resin injects by the opening of lower cover 38 and loam cake 43.This be because metal cap 39 and 40 and bump 37a do not have little through hole (as shown in figs. 1 and 2), and assembly is separated into two housings fully.One insulating packing 46 around the outside of ceramic body 31, cover 39 and 40 and the top of bar 41 and 42.Another insulating packing 47 around ceramic body 31 inside, cover 39 and 40 and with the bars 41 of pipe 44 and 45 coverings and 42 middle body.

Yet the ordinary capacitor among Fig. 1 and Fig. 2 has following shortcoming: as previously mentioned, cover the lower end that 8 below free ends are designed to stretch out in a little silicone rubber tube 15 and 16.We find in this layout, even the discharge between fin 20,21 and earthing conductor 7 also can excite when low voltage is added on the capacitor.If capacitor is used under greasy, many dusts and/or the wet environment for example kitchen, and has a large amount of oil, dust and/or steam to accumulate at fin 20 and 21, filler 17 and/or cover occasion on the 8 exposed bottom surfaces, this discharge is more remarkable.

Secondly, the bar 11 and 12 with fin 20 and 21 be inserted into respectively hole 9 and 10, hole 2 and 3 and metal cap 13 and 14 in after, filler 17 is by cover 8 opening injection.Therefore, in the filling process of filler, might can accidental accumulate on the surface of pipe 20 and 21 by insulating resin.This can hinder and form electric binding between fin and socket terminal (not drawing among the figure) mounted thereto.

Another common through dual-capacitor among Fig. 3 and Fig. 4, except with Fig. 1 and Fig. 2 in capacitor have the identical shortcoming, following shortcoming is still arranged: if capacitor is used for greasy, many dusts and/or wet environment, then oil, dust and/or steam can accumulate the upper surface that exposes at filler 46, bar 41 and 42 exposing surface, and the surfaces externally and internally of loam cake 43.Particularly, a large amount of oil, dust and/or steam are easy to accumulate on filler 46 surfaces, this is because the upstanding wall of the surface of filler 46 and lid 43 has formed a recessed portion, this just causes from bar 41 and 42, greatly reduces through the sheet resistance of the surfaces externally and internally of the surface of filler 46 and 43 path P 1 till the earthing conductor 37.In other words, owing to the oil, dust and/or the steam that accumulate at recessed portion, the insulation leakagel volume leakage length of this path (insulation creeping distance) has in fact shortened, shown in the symbol P2 among Fig. 4.Discharge inception voltage depends on the size of insulation leakagel volume leakage length, therefore, when a large amount of wet goods accumulated in recessed portion, can cause leaking electricity length or sheet resistance reduced, even thereby also may produce discharge along this path when low voltage puts on capacitor.

For this shortcoming, may expect loam cake 43 is extended upward the part removal of the exposed surface that surmounts filler 46 at an easy rate, the recessed portion that wet goods may be accumulated in it does not exist.Yet these means are also inadvisable, because the amount of the electric leakage length that is provided by loam cake 43 removed extension branch can be provided insulation leakagel volume leakage length.

Secondly, conducting rod 41 and 42 forms with fin 41a and 42a integral body respectively.Fin 41a and 42a are formed by mold pressing.In this mold process, might be at bar produce some distortion near tab portion.Conducting rod 41 and 42 distortion may cause in the filler 47 that injects shrinkage stress inhomogeneous, and this just causes the thermal characteristics deterioration of capacitor.

One of the utility model purpose is to provide a kind of novelty and improved through dual-capacitor to overcome the shortcoming of common through dual-capacitor.

Another purpose of the present utility model is to reduce because of accumulating the influence that oil, dust and/or steam caused on capacitor, and thereby improves electric strength.

The further purpose of the utility model is to reduce the accidental possibility that accumulates on the fin terminal of some insulating resin.

Above-mentioned and other purpose can realize that this through dual-capacitor comprises with a through dual-capacitor:

One earthing conductor, a bump that has a plate portion and swelled by this plate portion has a through hole at bump along the protuberance direction;

One cylindricality ceramic body, what have the electrode of a pair of isolation that is positioned at the ceramic body upper surface and be positioned at its lower surface uses electrode altogether, ceramic body and electrode have two shared through holes at its thickness direction, ceramic body be installed on the bump so that common electrode over against bump;

Pair of metal cover, each metal are covered with a hole, and each cover is installed on the electrode of corresponding isolation;

The pair of conductive bar runs through the through hole of each cover, the common through hole of ceramic body and the through hole of bump;

The 1st insulating lid is installed under the earthing conductor with becoming hollow cylindrical;

The 2nd insulating lid is installed on the earthing conductor with becoming hollow cylindrical;

A pair of insulated tube is coated on conducting rod, so that the free end of the 1st lid is stretched out in the end of each pipe; And

Insulating packing is injected into respectively in the 1st lid and the 2nd lid.

Above-mentioned and other purposes of the utility model will be understood easily owing to the explanation of back and accompanying drawing.

Fig. 1 is a kind of exploded perspective view of common through dual-capacitor.

Fig. 2 is the sectional arrangement drawing of the capacitor of Fig. 1.

Fig. 3 is the exploded perspective view of the common through dual-capacitor of another kind.

Fig. 4 is the sectional arrangement drawing of the capacitor of Fig. 3.

Fig. 5 is the exploded perspective view of an embodiment of the present utility model.

Fig. 6 is the sectional arrangement drawing of the embodiment of Fig. 5.

Fig. 7 is the figure in order to the common capacitor advantage relatively of the structure of key diagram 5 and Fig. 6 and Fig. 1 and Fig. 2.

Fig. 8 is the exploded perspective view of another embodiment of the present utility model.

Fig. 9 is the sectional arrangement drawing of the capacitor of Fig. 8.

A kind of variation of structure among Figure 10 presentation graphs 8 and Fig. 9.

Figure 11 is the stereogram of fin terminal that is used for the capacitor of Figure 10.

Figure 12 is the exploded perspective view of another embodiment of the present utility model.

Figure 13 is the sectional arrangement drawing of the capacitor of Figure 12.

Figure 14 is another sectional arrangement drawing of the capacitor of Figure 12.

With reference now to Fig. 5 and Fig. 6,, become the ellipticity ceramic body 51 of cylindrical configuration that a pair of through hole 52 and 53 are arranged in its thickness, at ceramic body 51 upper surfaces a pair of surface electrode 54 and 55 every glass is installed, this has corresponding through hole to electrode, at its lower surface a shared surface electrode 56 corresponding to through hole is installed.One earthing conductor 57 has the current-carrying part 57a of a rectangular conductive plate 57c and a protuberance.Plate 57c has 4 through hole 57c-1 to 57c-4, and available whereby screw is fixed in filter housing (not drawing among the figure) with capacitor.Have one in the central authorities of bump 57a and be roughly oval-shaped through hole 57b.Common electrode 56 is installed in the bump 57a of earthing conductor 57.The pair of metal cover 63 and 64 that respectively has a through hole is fixed in surface electrode 52 and 53 places with the soft soldering welding manner respectively.A pair of cylinder guide 59 and 60 be inserted in metal cap 63 and 64, ceramic body 51 through hole 52 and 53 and the oval through hole 57b of earthing conductor 57 in. Hole 52 and 53 diameter are greater than the diameter of conducting rod 59,60, and the diameter in the hole of cover 63 and 64 is a bit larger tham the diameter of bar.Bar 59 and 60 is welded in cover 63 and 64 by soft soldering respectively.Be fixed in earthing conductor 57 by ceramic material or as hollow cylindroid female caps 58 that insulating resin constituted such as epoxy resin or polybutene terephalic acid esters, coincide so that cover the inner surface of the upper section of 58 outer walls and bump 57a.Lid 58 has the shape of aforementioned cover of being similar to 8.Can be installed in the upper surface of earthing conductor 57c by the top hollow cylindroid female cap 65 that constitutes with lower cover 58 same materials, so that the outer wall of the below part of covering 65 inwalls and bump 57a coincide.Loam cake 65 is around ceramic body 51, metal cap 63 and 64 and the part of conducting rod 59 and 60.

Conducting rod 59 and 60 coats with the tubing 61 and 62 as formations such as silicon rubber respectively, insulated tube 61 and 62 upper end are docked to the horizontal inner surface of metal cap 63 and 64, and insulated tube 61 and 62 other end 61a and 62a extend downwards and exceed lower cover 58 below free end 58a significantly.In other words, insulated tube 61 and 62 extends beyond and covers 58 lower end.That is, cover 58 ends with respect to the height h0 of earthing conductor 57 greater than the height h1 of pipe 61 and 62 ends with respect to earthing conductor 57.The degree of stretching out of pipe or be equivalent to the poor of h0 and h1 apart from d2() at least should be greater than the upstanding wall of lid 58 and with respect to the horizontal range d1 between the tube wall of this wall.

In actual applications, insulated tube 61 and 62 the degree of stretching out depend on multiple factor, for example are added to the voltage on the capacitor and the size of capacitor.The free end that insulated tube 61 and 62 stretches out in lower cover 58 can reduce the influence that the oil, dust and/or the steam that accumulate at the capacitor lower edge produce, in other words, stretching out of insulated tube can reduce conducting rod 59,60(is not coated with insulated tube) the below part and earthing conductor 57 between the possibility of discharge, thereby realized a kind of capacitor of higher electric strength.Certainly, filler 66 and 67 is filled into respectively among loam cake 65 and the lower cover 58.

Fig. 7 is the advantage that illustrates under the capacitor comparison common among the utility model and Fig. 3 and Fig. 4 according to testing.Among the figure, ordinate is represented discharge inception voltage, and abscissa is represented the capacitors count corresponding to each discharge inception voltage.Use 10 sample and 10 samples in the experiment with Fig. 3 and structure shown in Figure 4 with structure shown in Fig. 5 and Fig. 6.This frequency that is applied to the alternating voltage on the capacitor is placed in 50Hz.As shown in FIG., in the 15KV scope, on the other hand, the discharge inception voltage of capacitor of the present utility model is in 19KV arrives the 22KV scope to the ordinary capacitor discharge inception voltage at 13KV.So the utility model can significantly improve the electric strength of capacitor.

Another embodiment of the utility model is illustrated among Fig. 8 and Fig. 9.In these figure, with reference signs same among each figure of front represent with each figure of front in same parts.Fig. 8 and basic characteristics illustrated in fig. 9 are: fin terminal 71 and 72 separates formation separately with conducting rod 63 and 64.It should be noted that the fin 21 and 22 of common capacitor becomes one with bar 11 and 12 respectively among Fig. 1 and Fig. 2, bar 63 and 64 is inserted into the through hole 52 and 53 and the hole 57b of earthing conductor 57 of ceramic body 51 together with cover 59 and 60. Bar 63 and 64 is coated with insulated tube 61 and 62 respectively.Certainly, these insulated tubes stretch out in the free end of lower case 70 significantly to improve the electric strength of capacitor.Fin 71 and 72 is individually fixed in bar 63 and 64.Fin 71 has a plate 71a and a C shape part 71b, and the slightly larger in diameter of C shape part 71b is in the diameter of cylindrical bar 63.The lower end of C shape part 71b and bar 63 links, and with welding or crimping mode and be fixed in this place.Similarly, fin 72 has a plate 72a and a C shape part 72.Fin 71 and 72 in insulating packing 66 and 67 is filled into upper case 65 and lower case 70 respectively after, be fixed in corresponding bar 63 and 64 places.Therefore, can prevent that some epoxy resin of filler accumulates on fin 71 and 72 accidentally when filler injects.

A kind of variation situation of the structure of Figure 10 key diagram 8 and Fig. 9.Among the figure, fin terminal 73 and 74 is fixed in the upper end of conducting rod 63 and 64 respectively to replace fin 71 and 72, and in the capacitor of Fig. 8 and Fig. 9, fin 71 and 72 is lower ends of being fixed in conducting rod.As shown in Figure 11, fin 73 and 74 has plate shape part 73a and 74a and hollow circle tube part 73b and 74b, and this cylindrical shape part 73b and 74b hold the upper end of bar 63 and 64 respectively.Certainly, the operation of fin 73 and 74 being fixed in bar 63 and 64 is just carried out after filler 66 injects.According to the embodiment of Fig. 9 and Figure 10, the production capacity of making the capacitor of two kinds of different types can improve, because the fin terminal can be fixed in arbitrary end of guide rod.

In addition, because fin terminal 73 and 74 is to be individually fixed in bar 63 and 64 places after filler 66 and 67 is injected into, therefore can avoids the distortion of bar and cause the shrinkage stress of filler inhomogeneous.

Figure 12 to Figure 14 illustrates another embodiment, in these figure, respectively schemes same reference signs at the same parts of this expression with the front.The basic characteristics of this embodiment are to have insulating lid or overlap 80 and 81, insulating lid or overlap 80 and 81 fin terminal 41a and the 42a that are fixed in conducting rod 41 and 42 respectively.Insulating case 80 and 81 is made of as pottery, thermosetting resin such as epoxy resin or silicon rubber inorganic insulating material.Insulating case 80 and 81 has rectangle through hole 80a and 81a, and fin 41a and 42a pass this through hole 80a and 81a respectively.Insulating case 80 and 81 lower edge all are embedded in the filler 46 that is filled in the upper case 43.On the other hand, insulating case 80 and 81 protrudes upward above filler 46 surperficial h2 height, as shown in Figure 13.The height of filler 46 is consistent with the free end of upper case 43, although the free end of common loam cake 43 extended upwardly the upper surface of filler 46, as previously mentioned, promptly be, according to present embodiment, do not comprise the recess of the surface of filler 82 as its bottom, therefore, oil, dust and/or steam can not accumulate on the surface of filler 82.In addition, the insulation leakagel volume leakage length between fin terminal 41a, 42a and earthing conductor 57 is because insulating case 80 and 81 and sufficiently prolonged, shown in mark P3 among Figure 13.As a result, present embodiment can prevent to reduce phenomenon by the caused electric strength of oil, dust and/or steam.

Advantage under Figure 12 common capacitor in the embodiment of Figure 14 and Fig. 3 is compared will be that the basis is illustrated with the experiment.Check present embodiment and common each three sample of capacitor, experiment is carried out under the following conditions: the high voltage that is higher than 20KV is added to repeatedly at filling surface and upper case and accumulates on the sample that some steam are arranged, and adds up added voltage number of repetition till measure sample destroyed (break down).The experimental result of the capacitor that table 1 expression is common, and the experimental result of table 2 expression present embodiment.

Table 1

Sample number into spectrum is alive number of repetition till destroying

1 6

2 5

3 7

Table 2

Sample number into spectrum is alive number of repetition till destroying

1 surpasses 120

2 surpass 120

3 surpass 120

By two tables in front as can be known, Figure 12 is very effective for the electric strength that increases capacitor to structure illustrated in fig. 14.

As previously mentioned, a kind of novelty and improved through dual-capacitor have obviously been proposed.Certainly, it should be understood that described embodiment only is used to illustrate, not in order to limit scope of the present utility model.

Claims (4)

1, through dual-capacitor comprises:

One earthing conductor, a bump that has a plate and formed by described plate protuberance has a through hole at bump along the protuberance direction,

One cylindricality ceramic body, have the electrode and a common electrode that is positioned at its lower surface of a pair of isolation that is positioned at the ceramic body upper surface, ceramic body and electrode have two shared through holes at its thickness direction, and ceramic body is installed on the bump, common electrode faces bump

The pair of metal cover, each described metal cap has a hole, and each described metal cap is installed on the electrode of corresponding isolation,

The pair of conductive bar runs through shared through hole, and the through hole of bump of through hole, the ceramic body of each metal cap,

First insulating lid becomes hollow cylindrical, is installed under the earthing conductor,

Second insulating lid becomes hollow cylindrical, is installed on the earthing conductor,

Insulating packing is injected into respectively in first insulating lid and second insulating lid,

Through dual-capacitor is characterised in that it also has a pair of conducting rod that is coated on, and its end extension surmounts the free-ended insulated tube of first insulating lid.

2, through dual-capacitor as claimed in claim 1 is characterized in that, is equipped with at arbitrary end of each conducting rod to be used for each fin terminal of connecting with outside.

3, through dual-capacitor as claimed in claim 1, it is characterized in that, be coated with insulating case to conducting rod top, the first end of each insulating case is embedded in the filler of being inserted in second insulating lid, and the exposing surface of filler in second insulating lid is stretched out in its end.

4, through dual-capacitor as claimed in claim 3 is characterized in that, the free-ended height of second insulating lid is consistent with the height of the exposing surface of the filler in second insulating lid.

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