CN103762071A - Foil type capacitive coil sintering process - Google Patents
Foil type capacitive coil sintering process Download PDFInfo
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- CN103762071A CN103762071A CN201310754404.5A CN201310754404A CN103762071A CN 103762071 A CN103762071 A CN 103762071A CN 201310754404 A CN201310754404 A CN 201310754404A CN 103762071 A CN103762071 A CN 103762071A
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Abstract
The invention provides a foil type capacitive coil sintering process and belongs to the field of manufacture technologies of transformer coils. According to the foil type capacitive coil sintering process, the shrinkage and the insulation performance of the material are taken into the material selection; meanwhile, the coil is formed by using a manner of vacuumizing and sintering, so that the production and manufacture costs are greatly reduced. Due to the adoption of the sintering process, the processes of drying, primarily dipping paint, secondarily drying and secondarily dipping paint can be omitted; after the coil is wound, the coil is directly fed into a sintering furnace, sintered for 4 hours, and demoulded after the temperature is reduced to 40 DEG C; the problem of gum leakage in the process is not required to considered; just the processes and the temperature are set before operating, the device can work automatically; according to the sintering process, the insulation is ensured by the self material solution and is not required to be ensured by means of the insulation paint, so that the pollution to the environment is avoided.
Description
Technical field
The invention belongs to transformer coil manufacture technology field, relate in particular to a kind of paper tinsel formula slab winding sintering process.
Background technology
At present, in the manufacturing of the electric products such as transformer, capacitor, reactor, all coils (winding) all adopt has the wire of insulation (conductor) to be wound on insulating cylinder, moulds of industrial equipment, by dry, dipping lacquer (oiling), solidify, vacuumize and the mode of epoxy casting completes, therefore adopt original manufacturing process, exist a lot of shortcomings, as low in voltage insulation performance, production cost is higher, the production cycle is longer.
So-called CVT installs one group of slab winding exactly additional on conventional dry-type transformer, its slab winding is exactly to make full use of the logical characteristic exchanging of stopping direct current of capacitor and the charge-discharge principle of capacitor, this transformer not only has conventional power transformation function, can meet the logical interchange of stopping direct current simultaneously and can meet again the capacitive characteristic discharging and recharging, thereby reach the object that can harmonic elimination can compensate again.
So-called electric capacity, its characteristic requirements is that the less capacitance of two interpolars (between two paper tinsels) distance is larger, more high capacitance is larger for the area of two interpolars (between two paper tinsels); With contrary, thicker (being that interfloor distance the is larger) resistance to pressure of layer insulation of coil winding two interpolars of CVT and putting property of anti-office are also just higher; Both are conflicting.But in the manufacturing of transformer, the gas that the resistance to pressure of interpolar and putting property of anti-office comprise with interpolar (or interlayer) insulating material again and the insulation characterisitic of insulating material self have very large relation.
Specifically (by giving an example aspect the production of Transformer Winding), 1. insulation property, the insulating material that the production technology of conventional transformer is chosen is all the material adopting through preimpregnation insulating varnish, as preimpregnation DM, preimpregnation SHS, preimpregnation DMD etc., above-mentioned material does not all have the ability of contraction, with the transformer coil of above-mentioned material coiling, all need by dry, vacuum paint dipping, the mode of epoxy casting improves the insulation property of product integral body, often when insulation property promote, can there is other problems again, as due in winding process, gap between wire or paper tinsel and insulating material is very little, when vacuumizing, the gas between two-layer insulation all can not be drained, once but have gas to have the inside at coil, (partial discharge) level is put in the withstand voltage level drawn game that will affect coil, under long-term operating state, will make coil puncture, affect equipment and normal normal operation of producing, can not reach the state of design far away, 2. production cost is higher, common production technology, aspect raw-material selection, can take into account the withstand voltage level of raw material self, so thickness with regard to unconditional amplified material, thereby the volume of product is also increased, also to assist with other insulating material (as soaking insulating varnish) just can reach the effect of insulation, so overall cost is higher, 3. the production cycle is longer, the conventional dry-type transformer production cycle needs 7-12 days, this does not wherein comprise the supply of material, often produce the time of a coil probably between 24-36 hour, according to paint-dipping process, be dried and need 6-8 hour (this time need be decided according to the size of transformer coil) first, vacuum paint dipping must be guaranteed 6-8 hour, redrying needs 6-8 hour, secondary dipping lacquer must be guaranteed 6 hours, according to epoxy casting technique, material, mould and die preheating needs 6-8 hour, vacuumizing and pouring into a mould needs 2 hours, but be at 24 hours, (wherein not comprise dress mould whole curing time, demould time, even in casting process, leak glue situation), 4. in the manufacturing enterprise of a lot of transformers, particularly at coil, process workshop section, environment is all messy, and there is a lot of dust, while is due to the smell of insulating varnish, many times employee could operate it after must wearing good protection appliances for labor protection, environment is had to certain pollution, auxiliary insulating material as impregnating varnish, diluent, epoxy resin, curing agent etc. be all the chemical material of highly corrosive, high volatilization, if in use there is no certain pre-alarm and prevention measure and urgent emergency preplan, consequence is by hardly imaginable.
Summary of the invention
The invention provides a kind of paper tinsel formula slab winding sintering process.Paper tinsel formula slab winding sintering process of the present invention, by following technical proposals, realize:
(1) the inside and outside protection insulation that selection and main insulation and end insulation are same material;
(2) dielectric film of unidirectional contraction is wound on mould, the minimum 1mm thickness that reaches, the one end by the wire bonds of chamfering to metal forming needs lead-in wire to put into wire lead slot simultaneously, with adhesive tape, fix, after according to the requirement of putting two-layer or three-layer insulated film between every layer of metal forming, carry out coiling;
(3) coil that coiling is good is installed external mold and is fixed, and puts into vacuum sintering furnace, takes the mode of intersecting to carry out short circuit in lead-in wires two-layer or three layer line circles;
(4) mold bottom is heated, make the upper and lower formation temperature of mould poor, bottom-heated is no more than dielectric film shrinkage temperature to temperature, in the process of heating, vacuumize in to stove, when reaching predetermined temperature difference, stop bottom-heated, open eddy heating for heating, by silicon controlled rectifier regulation voltage, according to the size of coil, also need to carry out overcurrent heating simultaneously.
(5) in sintering process, the additional mode vacuumizing is all discharged the gas of coil inside outside coil, when temperature reaches the complete holosystolic temperature of dielectric film, stops all heating;
(6) inert gas injecting in the most backward vacuum furnace, when temperature is down to 40 ℃ in stove, opens fire door, takes out coil and carries out the demoulding.
Paper tinsel formula slab winding sintering process of the present invention is considered the shrinkage of material and the insulation property of self on material is selected, and utilizes to vacuumize with the mode of sintering to make coil molding the manufacturing cost greatly reducing simultaneously; Adopt sintering process of the present invention, can save the flow process of dry, dipping lacquer, redrying, secondary dipping lacquer, after coil winding, directly enter sintering furnace, after the sintering of 4 hours, just can the demoulding when temperature is reduced to 40 ℃, without the leakage glue problem of considering in this process, only need before operation, flow process and temperature setting be reserved, equipment can be worked voluntarily; Sintering process of the present invention, guarantees by self insulated with material, need to not insulate by insulating varnish, so environment is not polluted.
Embodiment
Slab winding comprises metal forming (Copper Foil or aluminium foil), main insulating film and external lead wire, and described main insulating film comprises insulation between paper tinsel, end insulation, inside and outside protection insulation, and paper tinsel formula slab winding sintering process of the present invention comprises the following steps:
(1) before coiling, prepare: according to drawing requirement, select suitable inside and outside protection insulation, material need be same material with main insulation and end insulation;
(2) coil winding: the dielectric film of the unidirectional contraction of choosing is wound on special mould, the minimum 1mm thickness that reaches, one end by the wire bonds of prior chamfering to metal forming, need lead-in wire to put into wire lead slot simultaneously, with the adhesive tape of some strength, fix, in order to avoid go between and detach in groove when coiling, cause winding deformation, after according to the requirement of putting two-layer or three-layer insulated film between every layer of metal forming, carry out coiling;
(3) the good coil of coiling is installed to external mold and be fixed, put into customization vacuum sintering furnace, take the mode of intersecting to carry out short circuit in lead-in wires two-layer or three layer line circles;
(4) first mold bottom is heated, make the upper and lower formation temperature of mould poor, bottom-heated is no more than dielectric film shrinkage temperature to temperature, in will be to whole stove in the process of heating, vacuumize, when reaching predetermined temperature difference, stop bottom-heated, open eddy heating for heating, by silicon controlled rectifier regulation voltage, object is that the gas between dielectric film can well be discharged outside coil, simultaneously according to the size of coil, in order to be inside and outside coil, up and down can temperature equalization, in this process, also need to carry out overcurrent heating;
(5) in sintering process, the additional mode vacuumizing is all discharged the gas of coil inside outside coil, when temperature reaches the complete holosystolic temperature of dielectric film, stops all heating;
(6) inert gas injecting in the most backward vacuum furnace, as N2, slowly the object of inert gas injecting is the effect that makes coil cooling and isolated with air, when temperature is down to 40 ℃ in stove, opens fire door, takes out coil and carries out the demoulding.
In order to control cost, the material of described dielectric film is mainly the polyester of cross-linking radiation (being called for short PET), the polyethylene (PE) of cross-linking radiation or the polypropylene (PP) of cross-linking radiation.In order to improve magnetic conductivity, the material of described mould is 45 steel or 40GR.Predetermined temperature difference described in step (4) is the mould temperature difference of every 100 millimeters up and down, and its value is 10-15 ℃.Described inert gas is nitrogen (N2).
On Cost Problems, the insulation property of passing through dielectric film autogenous shrinkage improving product that sintering process adopts, rather than rely on the thickness of supplementary insulation material or raising insulating material to carry out the insulation property of improving product, so can greatly reduce in material cost, small product size, energy cost.And adopt sintering process only to need a sintering furnace (its cost is within 400,000), and in the last handling process of conventional coil, the equipment needing is a lot, as vacuum drying oven, impregnating vessel, curing oven, pouring can etc., its cost is in 1,000,000 left and right.
On the production cycle, the temperature control point of sintering process determines according to the character of insulating material, the initial constriction point of different insulating material is different, constriction point is different completely, and the time that a whole set of flow process is got off, in 4 hours, greatly reduces the production cycle of product.
Aspect environment, owing to having adopted sintering process, do not need in process of production to add any chemical composition as auxiliary insulating material, so also without the processing problem of considering with the material of chemical composition, to environment without any pollution.
, can there is not partial discharge and withstand voltage too low phenomenon in the paper tinsel formula slab winding good insulation preformance that adopts paper tinsel formula slab winding sintering process processing of the present invention yet; It is low, with short production cycle that this sintering process also has production cost; To environment without the advantage such as staining.
Claims (6)
1. a sintering process for paper tinsel formula slab winding, is characterized in that comprising the following steps:
(1) selection and main insulation and end insulation are the inside and outside protection dielectric film of same material;
(2) dielectric film of unidirectional contraction is wound on mould, the minimum 1mm thickness that reaches, the one end by the wire bonds of chamfering to metal forming needs lead-in wire to put into wire lead slot simultaneously, with adhesive tape, fix, after according to the requirement of putting two-layer or three-layer insulated film between every layer of metal forming, carry out coiling;
(3) coil that coiling is good is installed external mold and is fixed, and puts into vacuum sintering furnace, takes the mode of intersecting to carry out short circuit in lead-in wires two-layer or three layer line circles;
(4) mold bottom is heated, make the upper and lower formation temperature of mould poor, bottom-heated is no more than dielectric film shrinkage temperature to temperature, in the process of heating, vacuumize in to stove, when reaching predetermined temperature difference, stop bottom-heated, open eddy heating for heating, by silicon controlled rectifier regulation voltage, according to the size of coil, also need to carry out overcurrent heating simultaneously.
2.(5) in sintering process, the additional mode vacuumizing is all discharged the gas of coil inside outside coil, when temperature reaches the complete holosystolic temperature of dielectric film, stops all heating;
(6) inert gas injecting in the most backward vacuum furnace, when temperature is down to 40 ℃ in stove, opens fire door, takes out coil and carries out the demoulding.
3. the sintering process of paper tinsel formula slab winding according to claim 1, is characterized in that: the polypropylene of the polyester that described dielectric film is cross-linking radiation, the polyethylene of cross-linking radiation or cross-linking radiation.
4. the sintering process of paper tinsel formula slab winding according to claim 1, is characterized in that: the material of described mould is 45 steel or 40GR.
5. the sintering process of paper tinsel formula slab winding according to claim 1, is characterized in that: described inert gas is nitrogen.
6. the sintering process of paper tinsel formula slab winding according to claim 1, is characterized in that: the predetermined temperature difference described in step (4) is the mould temperature difference of every 100 millimeters up and down, and its value is 10-15 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310754404.5A CN103762071A (en) | 2013-12-31 | 2013-12-31 | Foil type capacitive coil sintering process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310754404.5A CN103762071A (en) | 2013-12-31 | 2013-12-31 | Foil type capacitive coil sintering process |
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| Publication Number | Publication Date |
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| CN103762071A true CN103762071A (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310754404.5A Pending CN103762071A (en) | 2013-12-31 | 2013-12-31 | Foil type capacitive coil sintering process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992834A (en) * | 2015-08-16 | 2015-10-21 | 新疆新华能西源电器有限公司 | Manufacturing technology of dry type transformer coil |
| CN106683868A (en) * | 2017-01-18 | 2017-05-17 | 厦门市百岗电气有限公司 | Electromagnet coil impregnation protection method |
| TWI609389B (en) * | 2015-09-18 | 2017-12-21 | All Ring Tech Co Ltd | Wire stripping method and mechanism |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2191427A (en) * | 1986-06-08 | 1987-12-16 | Sony Corp | Producing flat coils |
| CN102672338A (en) * | 2012-05-11 | 2012-09-19 | 江苏有能电力自动化有限公司 | Welding process of multilayer foil type coils of resonance-eliminating compensation transformation device |
| CN102682990A (en) * | 2012-05-13 | 2012-09-19 | 江苏有能电力自动化有限公司 | Technique for sintering foil type capacitive coil |
| CN102890998A (en) * | 2011-07-18 | 2013-01-23 | 尤大千 | Insulated winding or electromagnetic coil for electrical equipment and sintering and forming process of insulated winding or electromagnetic coil |
-
2013
- 2013-12-31 CN CN201310754404.5A patent/CN103762071A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2191427A (en) * | 1986-06-08 | 1987-12-16 | Sony Corp | Producing flat coils |
| CN102890998A (en) * | 2011-07-18 | 2013-01-23 | 尤大千 | Insulated winding or electromagnetic coil for electrical equipment and sintering and forming process of insulated winding or electromagnetic coil |
| CN102672338A (en) * | 2012-05-11 | 2012-09-19 | 江苏有能电力自动化有限公司 | Welding process of multilayer foil type coils of resonance-eliminating compensation transformation device |
| CN102682990A (en) * | 2012-05-13 | 2012-09-19 | 江苏有能电力自动化有限公司 | Technique for sintering foil type capacitive coil |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992834A (en) * | 2015-08-16 | 2015-10-21 | 新疆新华能西源电器有限公司 | Manufacturing technology of dry type transformer coil |
| TWI609389B (en) * | 2015-09-18 | 2017-12-21 | All Ring Tech Co Ltd | Wire stripping method and mechanism |
| CN106683868A (en) * | 2017-01-18 | 2017-05-17 | 厦门市百岗电气有限公司 | Electromagnet coil impregnation protection method |
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Application publication date: 20140430 |