CN204991477U - High voltage withstanding long -life polypropylene film condenser of CBB83 type - Google Patents

Abstract

The utility model provides a basic unit, the one deck polypropylene high temperature membrane (PPH) that now superposes, three strings of structures are used for the partial pressure, and PPH is used for thickening the dielectric layer, improves proof voltage and resistant current characteristics that the high pressure resistant long -life polypropylene film condenser of CBB83 type stays the limit during it is aluminized with single face ordinary district and singly stays limit zinc -aluminium edge thickening metallization polypropylene high temperature membrane (APHMT) to be the metallized film of three strings of structure condensers. Singly stay avris and PPH to align, the PPH of roll set department is than the long 20mm of APHMT, with PPH membrane title page, earlier cut off APHMT in rolling department, reuse PPH covering is 12-15 rings. 6040 the zinc -tin alloy of respraying after the pure zinc bottoming contains heavy -edge cladding material of the zinc -aluminium of zinc 95% or more and the contact of pure zinc metal spraying primer layer, for extremely similar molecular structure combines, has reduced contact resistance effectively, has reduced the contact loss, has reduced power loss of capacitor angle tangent value tg delta, and messenger's condenser both can be high voltage withstanding.

Description

The high voltage withstanding long-life polypropylene film capacitor of CBB83 type

Technical field:

Film capacitor field

Background technology:

In recent years, under the guide of " low-carbon (LC), environmental protection, energy-conservation " state basic policy, take frequency-conversion microwave oven as the variable frequency power supply fast development of representative.But the slower development of China's film capacitor industry, do not catch up with the demand of frequency-conversion microwave oven development, wherein for the high-voltage filtering capacitor device of the 3KV in frequency-conversion microwave oven and more than 3KV, the product of Introduced from Japan Panasonic and Japan's day essence can only be relied on, wherein most typical model is CBB21 type, and it is that the zinc-plated aluminium three of a kind of individual layer goes here and there metallized polypropylene film capacitor.

But the defect that this CBB21 type three crosstalk container is serious below existing in materials and structures design:

1, in order to improve the high withstand voltage of capacitor, this CBB21 type capacitor have employed three kinds of methods:

1. the basement membrane thickness of metalized film adopts 15 μm of super thick films.

In principle, improving the thickness of film is the most direct method improving proof voltage, but the quality of metalized film evaporation is not considered in this design.Because metalized film evaporation difficult point in the market: is ultrathin membrane, two is super thick films, and 15 μm belong to super thick film, and the subject matter of evaporation is that adhesive force is very poor, and it will directly affect the quality of capacitor.

2. structure adopt three string structures to improve proof voltage.

In principle, three string structures are adopted to be another direct methods improving capacitor proof voltage, but the at present design of CBB21 type three string structure also exists serious stays the not enough defect in limit, and wherein intermediately remained border is 1.8mm, singly stays limit to be 1mm, in pulse voltage experiment, when pulse voltage is 2.5UR, between electroplax, and produce electric arc between two coating being spaced apart 1.8mm, deielectric-coating is sustained damage, occurs that loss tangent is bad.

3. high square resistance zinc-aluminum film is adopted to improve proof voltage.

High square resistance zinc-aluminum film improves the good method of proof voltage, but not only voltage is high at the high-pressure filter circuit of frequency-conversion microwave oven, and electric current is also very large, and CBB21 type is applied to this position, and zinc-aluminium coating can be burnt gradually, and significantly damping characteristic appears in capacity.

2, because the upper employing 15 μm of thick basement membranes of design, thermocompression forming technique is difficult to control, and easily produce and do not press tightly, packing technology easily hits pine, and metal spraying powder enters between rete, causes insulation resistance bad.

As everyone knows, when the thickness of film is greater than more than 10 μm, can due to the effect of film elasticity in heat pressing process, capacitor body is after heat pressing process completes, the phenomenon of resilience can be produced, cause fuse center to be separated printing opacity, and in lower one packing technology, because the mechanical strength of fuse is inadequate, can produces and push away loose phenomenon.Once fuse pushes away pine, then in metal spraying technique, just have metal spraying powder and enter between the film gap of fuse, cause insulation resistance to decline, exceed standard and leakage current increase.

Described on end, CBB21 type capacitor has major defect, needs to improve.

The technical problem that one, will solve:

1, the polypropylene metalized film ZAPMT that gone here and there by the zinc-plated aluminium three of 15 μm of individual layers of CBB21 type three crosstalk container is modified into 8 μm of individual layers, the three string polypropylene metallization polypropylene high temperature membrane PPH of high temperature membrane APHMT and 8 μm that aluminizes and superposes, both taken into account high pressure resistant and withstand large current problems, and solved again coating adhesion difference and do not press tightly two large problems.

CBB21 type three crosstalk container is domestic and international more typical individual layer zinc-plated aluminium three string structure, theoretically, can meet the proof voltage requirement of capacitor.But the production technology of therefrom outer material there is two large problems:

1. the coating process of more than 10 μm is very immature, and the adhesive force of coating along with the increase of the thickness of basement membrane worse and worse.

2. the film of more than 10 μm can due to the effect of film elasticity in heat pressing process, and capacitor body, after heat pressing process completes, can produce the phenomenon of resilience, fuse center is caused to be separated printing opacity, and in lower one packing technology, because the mechanical strength of fuse is inadequate, can produces and push away loose phenomenon.Proof voltage problem has only been noted in the design of CBB21 type three crosstalk container, and have ignored the most important characteristic of coating adhesion and film elasticity.

The utility model patent CBB83 type three string structure capacitor not only considers the proof voltage of capacitor and resistance to big current, have also contemplated that the quality of coating and the quality of heat pressing process simultaneously, it have employed the ZAPMT of 15 μm, the PPH two-layer replacement CBB21 type of 8 μm APHMT and 8 μm, as shown in Figure 3, its advantage is as follows:

1. the electric weakness of two layer medium can be complementary, thus improve the qualification rate of capacitor proof voltage.

2. the adhesive force of the ZAPMT coating of the APHMT of 8 μm than 15 μm is good, and after hot pressing, coating is without coming off.Avoid the shortcoming of 15 μm of materials.

3. the be superimposed ZAPMT of replacement 15 μm of the PPH of APHMT and 8 μm of 8 μm had both met the requirement of proof voltage, solved again the technological problems do not pressed tightly because 15 μm of thick film elasticity are large, improve the qualification rate of insulation resistance.

4. APHMT replaces ZAPMT, is to aluminize with general area and metalized film that thickened area is zinc-aluminium replaces zinc-aluminium and heavy-edge metalized film, improves the resistance to current characteristics (frequency-conversion microwave oven application test is verified) of capacitor.

2, by the intermediately remained border 1.8mm of CBB21 type three crosstalk container with singly stay limit 1mm to improve to become intermediately remained border 3mm and singly stay limit 1.5mm, improving capacitor anti-pulse voltage ability.

Three string films of CBB21 type three crosstalk container, its intermediately remained border is 1.8mm, and singly stay limit to be that 1mm calculates by 1mm proof voltage 1000V, 1.8mm proof voltage is 1.8 × 1800V but rated voltage is the capacitor of 3KV, by the requirement of frequency-conversion microwave oven industry, its proof voltage is at least 2UR; Pulse voltage is at least 2.3UR, and namely pulse voltage should meet 6900V, and after dividing potential drop, C1C2 and C3 electric capacity lands 2300V respectively, and namely the proof voltage of 2300V will be born in the interval of 1.8mm, will inevitably produce electric arcing; In like manner at the 1mm place of Bian Liubian, voltage drop, also more than the limit of 1000V, also can produce electric arcing.

The intermediately remained borders of three string metalized films of the utility model patent CBB83 type three crosstalk container are 3mm, and singly stay limit to be 1.5mm, calculate by 1mm proof voltage 1000V, intermediately remained border place can resistance to 3000V, is greater than this place's voltage drop 2300V.Bian Liubian place can resistance to (1.5+0.8) × 1000V=2300V, namely equals voltage drop 2300V.So be no more than 6900V at transient voltage, namely during 2.3UR, any one of capacitor all can not produce electric arcing, is not only to have saved but also the design of safety.

3, CBB21 type three crosstalk container gilding layer is directly sprayed after quaternary alloy is improved to first blunt zinc bottoming and spray Zinc-tin alloy again, reduce contact resistance and the contact loss of capacitor.

CBB21 type three crosstalk container directly sprays quaternary alloy, as shown in Figure 2.Quaternary alloy differs greatly with the molecular structure of zinc-aluminium coating, so contact resistance and contact loss are very large, during capacitor work, temperature rise is very high.

The coating of the utility model patent CBB83 type three crosstalk container is aluminium coat, and thickened area, edge is zinc-aluminium, so metal spraying technique adopts pure zinc bottoming, spray Zinc-tin alloy afterwards, the pure zinc of bottoming and the zinc-aluminium coating contact resistance of thickened area, edge minimum, contact loss is extremely low, thus capacitor work time temperature rise very little, work under 105 DEG C of high temperature, End Face Temperature Rise is below 2.5 DEG C.Because the temperature rise of capacitor is little, can long-term stable operation when ambient temperature is higher.

Two, technical scheme:

The main technical schemes of the high voltage withstanding long-life polypropylene film capacitor of the utility model patent CBB83 type is:

1, one side is aluminized intermediately remained border and singly stay the thickened metalized polypropylene high temperature membrane APHMT in zinc-aluminium edge, limit to do the basic unit of the metalized film of three string structure capacitors.

2, each superposition one deck polypropylene high temperature membrane PPH below two metalized film (APHMT) dielectric layers, as shown in Figure 3.

3, winding process adopts roll set place PPH 20mm longer than APHMT, first rolls up PPH and interior envelope, rear volume APHMT; First cut off APHMT in rolling place, enclose with PPH covering 12 to 15 afterwards.

4, metal spraying technique adopts first pure zinc bottoming, sprays Zinc-tin alloy more afterwards, and the zinc-aluminium edge containing zinc more than 95% adds thickness coating and is similar to same molecular with pure zinc gilding layer and is combined, as shown in Figure 4.

Three, beneficial effect:

The high voltage withstanding long-life polypropylene film capacitor of the utility model patent CBB83 type is with both at home and abroad

CBB21 type three crosstalk container is compared, and beneficial effect is as follows:

1, the utility model patent CBB83 type capacitor replaces the thick ZAPMT film of individual layer 15 μm owing to adopting 8 μm of thick APHMT films to superpose 8 μm of thick PPH films, and two-layer electric weakness is complementary; Again owing to rationally increasing the width of intermediately remained border and Bian Liubian, add the insulation resistance between electroplax layer, improve the high voltage withstanding ability of capacitor, the impact capacity of the anti-instant high-voltage of capacitor and high impulse is strengthened.Pulse voltage >=2.3UR.

2, the shortcoming of the utility model patent CBB83 type capacitor owing to avoiding thick metalized film coating adhesion difference, use 8 μm of thick APHMT films instead to superpose 8 μm of thick PPH films and replace 15 μm of thick ZAPMT films, utilize 8 of top quality strongest point on market μm of thick metalized films, both high pressure resistant problem had been solved, solve again the adhesion problem of coating simultaneously, fundamentally control condenser capacity decay, extend the useful life of capacitor, make the life-span reach more than 10 years.

3, the utility model patent CBB83 type capacitor APHMT replaces ZAPMT, to aluminize with general area and metalized film that thickened area is zinc-aluminium replaces zinc-aluminium and heavy-edge metalized film, because electrode layer is low square resistance aluminium coat, so improve the resistance to current characteristics (frequency-conversion microwave oven application test is verified) of capacitor.

4, the utility model patent CBB83 type capacitor due to adopt in metal spraying technique first spray pure zinc after spray Zinc-tin alloy, allow the pure zinc of 100% first add webbing (containing zinc 95%) with zinc-aluminium combine, molecular structure is substantially identical, reduce contact resistance and contact loss tg δ, decrease the temperature rise of capacitor, when working under 105 DEG C of conditions, temperature rise≤2.5 DEG C.

5, the utility model patent CBB83 type capacitor is on winding process, roll set place adopt first roll up PPH film and in seal; In rolling place, directly cut off APHMT film, rear cut-out PPH film, and adopt PPH film covering, the excellent of sealing.

6, the utility model patent CBB83 type capacitor throws in frequency-conversion microwave oven market in April, 2013, and current quantity has reached more than 1,000,000, instead of PANASONIC and day essence and other imported product, Market reaction is fine.

Four, shortcoming:

Require high to production equipment and checkout equipment, the high-end devices of domestic equipment or Introduced From Abroad need be improved.

Accompanying drawing illustrates:

Below in conjunction with accompanying drawing and embodiment, the utility model patent is described further:

Fig. 1 is the horizontal section structure chart of CBB21 type three crosstalk container fuse, wherein:

1. and be 2. a pair one side plating intermediately remained border and singly stay limit three string structure polypropylene zinc-aluminium metalized film, namely

ZAPMT film;

3. and be 4. the zinc-aluminium coating of ZAPMT film, i.e. electrode layer;

C1C2 and C3 is three inner interior serial capacitors;

X1 and X2 is three crosstalk container intermediately remained border width; T is that three crosstalk container film lists stay hem width degree; Z is the wrong fabric width degree of a pair ZAPMT film.

Fig. 2 is the horizontal section structure chart after CBB21 type three crosstalk container fuse metal spraying, wherein:

5. be quaternary alloy gilding layer.

Fig. 3 is the horizontal section structure chart of the utility model patent CBB83 type three crosstalk container, wherein:

1. and be 2. that a pair one side is aluminized intermediately remained border and singly stay the thickened metalized polypropylene high temperature membrane in zinc-aluminium edge, limit, i.e. APHMT film;

3. and be 4. the aluminium coat of APHMT film, i.e. electrode layer;

5. with 6. for being stacked in the PPH film under APHMT film, the basement membrane of APHMT film forms the dielectric layer of capacitor together with PPH film.

X1 and X2 is the intermediately remained border width of three string metalized films, T be three string metalized films singly stay hem width degree, Z is the wrong fabric width degree of a pair APHMT film;

C1C2 and C3 is three electric capacity of internal series-connection;

Fig. 4 is the horizontal section structure chart after the utility model patent CBB83 type capacitor body metal spraying, wherein:

7. be pure zinc metal spraying prime coat, its molecular structure and electrode layer fairly similar.

8. be red brass layer, fusing point is lower, is used for welding drawing CP line.

Embodiment:

Fig. 3 and Fig. 4 is the horizontal section structure chart of the utility model patent working example, uses APHMT one side to aluminize intermediately remained border and singly stay the thickened metalized polypropylene high temperature membrane in zinc-aluminium edge, limit in the drawings, see Fig. 3 1. and 2..Its design parameter is APHMT-8 μm × 21.5 × M6.2 × A3 × M10.8 × T1.5, and below it, superpose one deck 8 μm × 21mmPPH film, see in Fig. 3 5. and 6..Due to the existence of three string film X1 and X2, (according to the height of rated voltage, intermediately remained border X1 and X2 varies in size, in this example, intermediately remained border is A3, and namely intermediately remained border is 3mm, singly stays limit to be T1.5, namely limit is singly stayed to be 1.5mm), form C1C2 and C3 tri-capacitor series connection.

Fig. 5 is longitudinal unfolding assumption diagram of the utility model patent CBB83 type capacitor embodiment, and in Figure 5, important requirement is as follows:

At the roll set place of winding, PPH 20mm longer than APHMT, first rolls up PPH film, rear volume APHMT film; Seal with in PPH film.

In rolling place of winding, first cut off APHMT film, then enclose with PPH film covering 12 ~ 15.

Reel as above, the number of turns of winding depends on the capacity required for concrete capacitor.Concrete technology flow process is as follows:

Winding → hot pressing → heat treatment → wrap up → spray pure zinc → spray red brass → CP line of energizing → weld → row's core → dehumidifying → interior bag pure epoxy resin → solidification → powder coating → cutting paint → levelling solidification → printing mark → reliability pulse entirely to examine → electrical property sorting → electrical property sampling observation → packaging.

Claims (1)

1. one kind cBB83the high voltage withstanding long-life polypropylene film capacitor of type, its structural feature is:

Aluminize intermediately remained border and singly stay the thickened metalized polypropylene high temperature membrane in zinc-aluminium edge, limit in one side general area (APHMT)do the basic unit of the metalized film of three string structure capacitors,

At two metalized films (APHMT)dielectric layer below each superposition one deck polypropylene high temperature membrane (PPH),

At volume place pPHratio the long 20mm of APHMT,in rolling place aPHMTwith pPHcovering 12 to 15 encloses ,

Its metal spraying structure adopts the zinc-aluminium edge containing zinc more than 95% to add thickness coating and pure zinc gilding layer.