CN101882846B - Method for forming end insulation of stator coil by vacuum pressure impregnation - Google Patents
Method for forming end insulation of stator coil by vacuum pressure impregnation Download PDFInfo
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- CN101882846B CN101882846B CN2010102189838A CN201010218983A CN101882846B CN 101882846 B CN101882846 B CN 101882846B CN 2010102189838 A CN2010102189838 A CN 2010102189838A CN 201010218983 A CN201010218983 A CN 201010218983A CN 101882846 B CN101882846 B CN 101882846B
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Abstract
The invention provides a method for forming end insulation of a stator coil by vacuum pressure impregnation, which is characterized by comprising the following steps: making a fiber-woven heat shrinkable wraparound sleeve; making unvulcanized hot-pressing packing strips and vulcanizing the hot-pressing packing strips; and clamping the vulcanized hot-pressing packing strips on an end surface of the stator coil which is wounded with a polytetrafluoroethylene film insulation demoulding material, winding the fiber-woven heat shrinkable wraparound sleeve on the vulcanized hot-pressing packing strips in a half-lap manner and heating the hot-pressing packing strips for solidification. In the invention, the hot-pressing packing strips adapting to the shape of the coil are manufactured and can be used repeatedly; and four hot-pressing packing strips shrink naturally to form a circular arc shape in the vulcanization process, the pressure applied by the heat shrinkable wraparound sleeve during shrinkage is uniform, the mold rigidity is high, and the coil is insusceptible to deformation under heat. The heat shrinkable wraparound sleeve with a proper shrinkage force is woven and replaces a mold in processing, the lap winding mode is changed, the pressure applied can be controlled, and the shrinkage force is uniform with the uniform lap winding.
Description
Technical field
The present invention relates to a kind of method for forming end insulation of stator coil by vacuum pressure impregnation; Be used for the electricity generator stator coil after the vacuum pressure impregnation is cured; Make and solidify finer and closely; Reach required insulation thickness, avoid coil in heating process, to be out of shape and impaired, belong to the motor manufacturing technology field.
Background technology
At energy field, in the high-rating generator that main force's electrical network is adopted, the insulation of stator coil is directly connected to the operational reliability of generator, life-span and technical-economic index, belongs to core component.At present, large-sized electricity generator stator coil main insulation technological development direction mainly is stator coil main insulation attenuate, improves conductive coefficient, to improve the generator operation economic index.The common objective of these problems is how to make the fine and close more insulation of satisfying certain design thickness.
The large-sized electricity generator stator coil cross section is mostly for being the rectangle of a fillet.Original insulation moulding process is coil to be packed into carry out molded curing in the rectangle hot pressing die according to the manufacturing of certain insulation decrement, adopts different dies for different coils, and the fixed mould cost is very high.Every mould heats separately; This mode of heating bed die and the coil temperature difference are bigger; Cause the resin solidification speed of coil surface and internal layer inhomogeneous, against vacuum pressure impregnation coil especially, the manufacture of fixed mould is unfavorable for that a large amount of of coil make fast.
Summary of the invention
The purpose of this invention is to provide a kind of method for forming end insulation of stator coil by vacuum pressure impregnation; With the stator coil after the vacuum pressure impregnation is that gelled coil is cured; Be used through can effectively stoping the temperature distortion of VPI stator coil end, rigidity flexible mould better, that can use repeatedly to tighten up binding strap, make the end winding forming and hardening preferably that insulate with the mould that enough convergent forces are arranged.
In order to achieve the above object, the invention provides a kind of method for forming end insulation of stator coil by vacuum pressure impregnation, it is characterized in that, concrete steps are:
The first step, according to the shape cutting mat aluminium sheet of four faces of stator coil end; The thickness of liner aluminium sheet be 1mm～3mm, width between the stator coil width after gelled coil width and the insulation processing, two of liner aluminium sheet respectively grows 25～100mm than stator coil end; The not sulfuration neoprene plate that 2～6mm is thick is cut into strip; The length of not vulcanizing the neoprene plate is consistent with the liner aluminium sheet; Be close to width that liner aluminium sheet ground floor do not vulcanize the neoprene plate than the little 1～5mm of liner aluminium sheet width; The second layer does not vulcanize the neoprene plate and does not vulcanize the little 8～15mm of neoprene plate width than ground floor; The 3rd layer is not vulcanized the neoprene plate and does not vulcanize the again little 8～15mm of neoprene plate width than the second layer, and by that analogy, it is 15～30mm that outermost one deck does not vulcanize neoprene plate width;
Second step, adopt 30～50 1500～2500 Denier the heat shrinkable polyester silvalin as warp thread, every yarn count is that 155 ℃～180 ℃ polyester fiber is formed by 300～400 non-twist temperature resistant grades; The twist that adopts 5～10 be the alkali-free glass fibre yarn of 0.5-2 as weft yarn, every yarn is made up of 100～200 alkali-free glass fibre yarns; Adopt the plain weave mode to be woven into the fibrage shrink belt that thickness is 0.25mm～0.4mm;
The 3rd step, will not vulcanize the neoprene plate and leniently overlay on the liner aluminium sheet to narrow, wrapped polytetrafluoroethylene film is processed unvulcanized bake pressure filler strip; To be put into corresponding stator coil end surface according to four unvulcanized bake pressure filler strips of four faces making of stator coil end, the liner aluminium sheet is close to the stator coil end surface, 1～3 layer of wrapped fibrage shrink belt; Stator coil is sent into drying room be heated to 120 ℃～160 ℃; Insulation 2h～6h; Carry out bake pressure filler strip vulcanizing treatment, be cooled to room temperature, dismantle fibrage shrink belt and polytetrafluoroethylene film obtain the outside and are smooth circular-arc sulfuration neoprene plate; Sulfuration neoprene plate is cut according to the length of stator coil end; Position in that sulfuration neoprene bladed saw is disconnected is rolled over 90 ° with the liner aluminium sheet to one rollover of sulfuration neoprene plate, and liner aluminium sheet end face is trimmed to the bake pressure filler strip that the arc consistent with vulcanizing the neoprene plate obtains vulcanizating, and the bake pressure filler strip that vulcanizates is pushed with hand with the wrapped one deck of polytetrafluoroethylene adhesive tape cling;
The 4th goes on foot, four bake pressure filler strips that vulcanizate is clipped in the stator coil end surface of wrapped good polytetrafluoroethylene film insulation release materials; Be wrapped in outside the bake pressure filler strip that vulcanizates with fibrage shrink belt half-stack package, twine 1～3 layer of the number of plies, in drying room, heat with stator coil; 140 ℃～190 ℃ of fixed subcoil insulating curing temperatures; Temperature retention time 4h～10h is cooled to room temperature after the curing, remove the stator coil after fibrage shrink belt and bake pressure filler strip obtain insulation processing.
Advantage of the present invention is: 1) produce the bake pressure filler strip that is fit to coil shape; The bake pressure filler strip can use repeatedly; Four bake pressure filler strips tighten up in the arc-shaped in sulfidation naturally; Make that pressure was even when shrink belt tightened up, adopt the mode mould rigidity of four filler strips better, it is not yielding to guarantee that coil is heated.2) knit out the shrink belt of suitable convergent force, replace carrying out the mould pressurization, it is adjustable to change wrapped mode moulding pressure, and wrapped evenly then convergent force is even.
Description of drawings
Fig. 1 is the stator coil front view;
Fig. 2 is unvulcanized bake pressure filler strip front view;
Fig. 3 is unvulcanized bake pressure filler strip end view;
Fig. 4 is the bake pressure filler strip front view after vulcanizing;
Fig. 5 is the bake pressure filler strip end view after vulcanizing;
Fig. 6 is end winding insulation moulding schematic cross-section.
Embodiment
Specify the present invention below in conjunction with embodiment.
As shown in Figure 1, be the stator coil front view, stator coil needs cured after handling through vacuum pressure impregnation, and wherein, stator coil middle part 8 adopts the conventional fixed mould to be cured, and stator coil end 7 adopts following method to be cured.
The first step, according to the shape cutting mat aluminium sheet 1 of 7 four faces of stator coil end; The thickness of liner aluminium sheet 1 be 1mm, width between stator coil 5 width after gelled coil 4 width and the insulation, two of liner aluminium sheet 1 respectively grows 50mm than stator coil end 7; 2 thick not sulfuration neoprene plates 2 are cut into strip; The length of not vulcanizing neoprene plate 2 is consistent with liner aluminium sheet 1; Be close to width that liner aluminium sheet 1 ground floor do not vulcanize neoprene plate 2 than the little 1mm of liner aluminium sheet 1 width; The second layer does not vulcanize neoprene plate 2 and does not vulcanize the little 8mm of neoprene plate 2 width than ground floor; The 3rd layer is not vulcanized neoprene plate 2 and does not vulcanize the again little 8mm of neoprene plate 2 width than the second layer, and by that analogy, it is 15mm that outermost one deck does not vulcanize neoprene plate 2 width;
(the Shanghai China dynamo-electric Co., Ltd of Xiang produces the heat shrinkable polyester silvalin of second step, 30 1500 Denier of employing; The polyester that is formed by organic dibasic acid and dihydroxylic alcohols polycondensation is through the synthetic fibers of spinning gained) as warp thread, every yarn count is that 155 ℃ polyester fiber is formed by 300 non-twist temperature resistant grades; The alkali-free glass fibre yarn that to adopt 5 twists of number be 1.0Z is as weft yarn, and every yarn count is made up of 100 alkali-free glass fibre yarns (the Shanghai magnificent composite material Co., Ltd that shines produces, and model is ET-100); Adopt the plain weave mode to be woven into the fibrage shrink belt 6 that thickness is 0.25mm; The effect of fibrage shrink belt 6 is: adopt the wide 38mm shrink belt of tensile force stretching fixed length 200mm of 20N, after 150 ℃ of half an hour, convergent force is greater than 170N, and whole insulating process convergent force is kept constant.
The 3rd step, will not vulcanize neoprene plate 2 and leniently overlay on the liner aluminium sheet 1 to narrow, wrapped polytetrafluoroethylene film is processed unvulcanized bake pressure filler strip; Four unvulcanized bake pressure filler strips to making according to 7 four faces of stator coil end are put into corresponding stator coil end 5 surfaces of insulating, and liner aluminium sheet 1 is close to coil surface, 61 layers of wrapped fibrage shrink belts; Stator coil is sent into drying room be heated to 120 ℃; Insulation 6h; Carry out bake pressure filler strip vulcanizing treatment; Be cooled to room temperature; Be smooth circular-arc sulfuration neoprene plate 4 outside the fibrage shrink belt 6 of dismantling obtains with polytetrafluoroethylene film, sulfuration neoprene plate 4 is cut according to the length of stator coil end 7, liner aluminium sheet 1 is rolled over 90 ° to 4 one rollovers of sulfuration neoprene plate in sulfuration neoprene plate 4 sawed-off positions; Liner aluminium sheet 1 end face is trimmed to and vulcanizes the bake pressure filler strip that neoprene plate 4 consistent arcs obtain vulcanizating, the bake pressure filler strip that vulcanizates is pushed with hand and clinged with the wrapped one deck of polytetrafluoroethylene adhesive tape (production of Shanghai Hu Xi sebific duct factory);
The 4th step, the stator coil end that four bake pressure filler strips that vulcanizate are clipped in wrapped good polytetrafluoroethylene film insulation release materials 5 surfaces of insulating; Be wrapped in outside the bake pressure filler strip that vulcanizates with fibrage shrink belt 6 half-stack packages, twine 1 layer of the number of plies, in drying room, heat with stator coil; 140 ℃ of fixed subcoil insulating curing temperatures; Temperature retention time 10h is cooled to room temperature after the curing, remove the stator coil after fibrage shrink belt 6 and bake pressure filler strip obtain insulation processing.
As shown in Figure 1, be the stator coil front view, stator coil needs cured after handling through vacuum pressure impregnation, and wherein, stator coil middle part 8 adopts the conventional fixed mould to be cured, and stator coil end 7 adopts following method to be cured.
The first step, according to the shape cutting mat aluminium sheet 1 of 7 four faces of stator coil end; The thickness of liner aluminium sheet 1 be 2mm, width between stator coil 5 width after gelled coil 4 width and the insulation, two of liner aluminium sheet 1 respectively grows 75mm than stator coil end 7; The not sulfuration neoprene plate 2 that 4mm is thick is cut into strip; The length of not vulcanizing neoprene plate 2 is consistent with liner aluminium sheet 1; Be close to width that liner aluminium sheet 1 ground floor do not vulcanize neoprene plate 2 than the little 3mm of liner aluminium sheet 1 width; The second layer does not vulcanize neoprene plate 2 and does not vulcanize the little 12mm of neoprene plate 2 width than ground floor; The 3rd layer is not vulcanized neoprene plate 2 and does not vulcanize the again little 12mm of neoprene plate 2 width than the second layer, and by that analogy, it is 22mm that outermost one deck does not vulcanize neoprene plate 2 width;
Second step, adopt 40 2000 Denier heat shrinkable polyester silvalin (the Shanghai China dynamo-electric Co., Ltd of Xiang produces) as warp thread, every yarn count is that 180 ℃ polyester fiber is formed by 300 non-twist temperature resistant grades; The alkali-free glass fibre yarn that to adopt 8 twists of number be 1.0Z is as weft yarn, and every yarn count is made up of 150 alkali-free glass fibre yarns (the Shanghai magnificent composite material Co., Ltd that shines produces, and model is ET-100); Adopt the plain weave mode to be woven into the fibrage shrink belt 6 that thickness is 0.33mm; The effect of fibrage shrink belt 6 is: adopt the wide 38mm shrink belt of tensile force stretching fixed length 200mm of 20N, after 150 ℃ of half an hour, convergent force reaches 190N, and whole insulating process convergent force is kept constant.
The 3rd step, will not vulcanize neoprene plate 2 and leniently overlay on the liner aluminium sheet 1 to narrow, wrapped polytetrafluoroethylene film is processed unvulcanized bake pressure filler strip; Four unvulcanized bake pressure filler strips to making according to 7 four faces of stator coil end are put into corresponding stator coil end 5 surfaces of insulating, and liner aluminium sheet 1 is close to coil surface, 62 layers of wrapped fibrage shrink belts; Stator coil is sent into drying room be heated to 140 ℃; Insulation 4h; Carry out bake pressure filler strip vulcanizing treatment; Be cooled to room temperature; Be smooth circular-arc sulfuration neoprene plate 4 outside the fibrage shrink belt 6 of dismantling obtains with polytetrafluoroethylene film, sulfuration neoprene plate 4 is cut according to the length of stator coil end 7, liner aluminium sheet 1 is rolled over 90 ° to 4 one rollovers of sulfuration neoprene plate in sulfuration neoprene plate 4 sawed-off positions; Liner aluminium sheet 1 end face is trimmed to and vulcanizes the bake pressure filler strip that neoprene plate 4 consistent arcs obtain vulcanizating, the bake pressure filler strip that vulcanizates is pushed with hand and clinged with the wrapped one deck of polytetrafluoroethylene adhesive tape (production of Shanghai Hu Xi sebific duct factory);
The 4th step, the stator coil end that four bake pressure filler strips that vulcanizate are clipped in wrapped good polytetrafluoroethylene film insulation release materials 5 surfaces of insulating; Be wrapped in outside the bake pressure filler strip that vulcanizates with fibrage shrink belt 6 half-stack packages, twine 2 layers of the numbers of plies, in drying room, heat with stator coil; 160 ℃ of fixed subcoil insulating curing temperatures; Temperature retention time 7h is cooled to room temperature after the curing, remove the stator coil after fibrage shrink belt 6 and bake pressure filler strip obtain insulation processing.
As shown in Figure 1, be the stator coil front view, stator coil needs cured after handling through vacuum pressure impregnation, and wherein, stator coil middle part 8 adopts the conventional fixed mould to be cured, and stator coil end 7 adopts following method to be cured.
The first step, according to the shape cutting mat aluminium sheet 1 of 7 four faces of stator coil end; The thickness of liner aluminium sheet 1 be 3mm, width between stator coil 5 width after gelled coil 4 width and the insulation, two of liner aluminium sheet 1 respectively grows 100mm than stator coil end 7; The not sulfuration neoprene plate 2 that 6mm is thick is cut into strip; The length of not vulcanizing neoprene plate 2 is consistent with liner aluminium sheet 1; Be close to width that liner aluminium sheet 1 ground floor do not vulcanize neoprene plate 2 than the little 5mm of liner aluminium sheet 1 width; The second layer does not vulcanize neoprene plate 2 and does not vulcanize the little 15mm of neoprene plate 2 width than ground floor; The 3rd layer is not vulcanized neoprene plate 2 and does not vulcanize the again little 15mm of neoprene plate 2 width than the second layer, and by that analogy, it is 30mm that outermost one deck does not vulcanize neoprene plate 2 width;
Second step, adopt 50 2500 Denier heat shrinkable polyester silvalin (the Shanghai China dynamo-electric Co., Ltd of Xiang produces) as warp thread, every yarn count is that 180 ℃ polyester fiber is formed by 400 non-twist temperature resistant grades; The alkali-free glass fibre yarn that to adopt 10 twists of number be 1.0Z is as weft yarn, and every yarn count is made up of 200 alkali-free glass fibre yarns (the Shanghai magnificent composite material Co., Ltd that shines produces, and model is ET-100); Adopt the plain weave mode to be woven into the fibrage shrink belt 6 that thickness is 0.4mm; The effect of fibrage shrink belt 6 is: adopt the wide 38mm shrink belt of tensile force stretching fixed length 200mm of 20N, after 150 ℃ of half an hour, convergent force reaches 250N, and whole insulating process convergent force is kept constant.
The 3rd step, will not vulcanize neoprene plate 2 and leniently overlay on the liner aluminium sheet 1 to narrow, wrapped polytetrafluoroethylene film is processed unvulcanized bake pressure filler strip; Four unvulcanized bake pressure filler strips to making according to 7 four faces of stator coil end are put into corresponding stator coil end 5 surfaces of insulating, and liner aluminium sheet 1 is close to coil surface, 63 layers of wrapped fibrage shrink belts; Stator coil is sent into drying room be heated to 160 ℃; Insulation 2h; Carry out bake pressure filler strip vulcanizing treatment; Be cooled to room temperature; Be smooth circular-arc sulfuration neoprene plate 4 outside the fibrage shrink belt 6 of dismantling obtains with polytetrafluoroethylene film, sulfuration neoprene plate 4 is cut according to the length of stator coil end 7, liner aluminium sheet 1 is rolled over 90 ° to 4 one rollovers of sulfuration neoprene plate in sulfuration neoprene plate 4 sawed-off positions; Liner aluminium sheet 1 end face is trimmed to and vulcanizes the bake pressure filler strip that neoprene plate 4 consistent arcs obtain vulcanizating, the bake pressure filler strip that vulcanizates is pushed with hand and clinged with the wrapped one deck of polytetrafluoroethylene adhesive tape (production of Shanghai Hu Xi sebific duct factory);
The 4th step, the stator coil end that four bake pressure filler strips that vulcanizate are clipped in wrapped good polytetrafluoroethylene film insulation release materials 5 surfaces of insulating; Be wrapped in outside the bake pressure filler strip that vulcanizates with fibrage shrink belt 6 half-stack packages, twine 3 layers of the numbers of plies, in drying room, heat with stator coil; 190 ℃ of fixed subcoil insulating curing temperatures; Temperature retention time 4h is cooled to room temperature after the curing, remove the stator coil after fibrage shrink belt 6 and bake pressure filler strip obtain insulation processing.
Claims (1)
1. a method for forming end insulation of stator coil by vacuum pressure impregnation is characterized in that, concrete steps are:
The first step, according to the shape cutting mat aluminium sheet (1) of (7) four faces of stator coil end; The thickness of liner aluminium sheet (1) be 1mm～3mm, width between stator coil (5) width after gelled coil (4) width and the insulation, two of liner aluminium sheet (1) respectively grows 25～100mm than stator coil end (7); The not sulfuration neoprene plate (2) that 2～6mm is thick is cut into strip; The length of not vulcanizing neoprene plate (2) is consistent with liner aluminium sheet (1); Be close to width that the ground floor of liner aluminium sheet (1) do not vulcanize neoprene plate (2) than the little 1～5mm of liner aluminium sheet (1) width; The second layer does not vulcanize neoprene plate (2) and does not vulcanize the little 8～15mm of neoprene plate (2) width than ground floor; The 3rd layer is not vulcanized neoprene plate (2) and does not vulcanize the again little 8～15mm of neoprene plate (2) width than the second layer, and by that analogy, it is 15～30mm that outermost one deck does not vulcanize neoprene plate (2) width;
Second step, adopt 30～50 1500～2500 Denier the heat shrinkable polyester silvalin as warp thread, every yarn count is that 155 ℃～180 ℃ polyester fiber is formed by 300～400 non-twist temperature resistant grades; The alkali-free glass fibre yarn that 5～10 twists of employing number are 1.0Z is as weft yarn, and every yarn count is made up of 100～200 alkali-free glass fibre yarns; Adopt the plain weave mode to be woven into the fibrage shrink belt (6) that thickness is 0.25mm～0.4mm;
The 3rd step, will not vulcanize neoprene plate (2) and leniently overlay on the liner aluminium sheet (1) to narrow, wrapped polytetrafluoroethylene film is processed unvulcanized bake pressure filler strip; To be put into corresponding stator coil end insulation (5) surface according to four unvulcanized bake pressure filler strips of (7) four faces making of stator coil end, liner aluminium sheet (1) is close to coil surface, (6) 1～3 layers of wrapped fibrage shrink belts; Stator coil is sent into drying room be heated to 120 ℃～160 ℃; Insulation 2h～6h; Carry out bake pressure filler strip vulcanizing treatment; Be cooled to room temperature; Dismantle fibrage shrink belt (6) and polytetrafluoroethylene film obtains the outside and is smooth circular-arc sulfuration neoprene plate (4), will vulcanize neoprene plate (4) and cut according to the length of stator coil end (7), in the sawed-off position of sulfuration neoprene plate (4) liner aluminium sheet (1) rolled over 90 ° to (4) one rollovers of sulfuration neoprene plate; Liner aluminium sheet (1) end face is trimmed to and vulcanizes the bake pressure filler strip that the consistent arc of neoprene plate (4) obtains vulcanizating, the bake pressure filler strip that vulcanizates is pushed with hand with the wrapped one deck of polytetrafluoroethylene adhesive tape clinged;
The 4th goes on foot, four bake pressure filler strips that vulcanizate is clipped in stator coil end insulation (5) surface of wrapped good polytetrafluoroethylene film insulation release materials; Be wrapped in outside the bake pressure filler strip that vulcanizates with fibrage shrink belt (6) half-stack package; Twine 1～3 layer of the number of plies; In drying room, heat 140 ℃～190 ℃ of fixed subcoil insulating curing temperatures, temperature retention time 4h～10h with stator coil; Be cooled to room temperature after the curing, remove the stator coil after fibrage shrink belt (6) and bake pressure filler strip obtain insulation processing.
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| CN2010102189838A CN101882846B (en) | 2010-06-30 | 2010-06-30 | Method for forming end insulation of stator coil by vacuum pressure impregnation |
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| CN2010102189838A CN101882846B (en) | 2010-06-30 | 2010-06-30 | Method for forming end insulation of stator coil by vacuum pressure impregnation |
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| CN101882846B true CN101882846B (en) | 2012-07-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102412012B (en) * | 2011-12-29 | 2017-03-15 | 扬州腾飞电缆电器材料有限公司 | Low-smoke bittern-free highly fire-proof band and its manufacture method |
| CN104227870A (en) * | 2014-09-28 | 2014-12-24 | 湘潭电机股份有限公司 | Demoulding process of VPI (vacuum pressure impregnation) epoxy resin for whole motor |
| CN104852496B (en) * | 2015-05-21 | 2017-08-29 | 苏州贯龙电磁线有限公司 | Low wind speed wind power generator coil |
| CN104917320B (en) * | 2015-06-03 | 2018-01-19 | 卧龙电气集团股份有限公司 | A kind of 6KV high-voltage motors formed coil and its processing method |
| CN113193450B (en) * | 2020-01-14 | 2023-07-21 | 中国科学院沈阳自动化研究所 | Vacuum vulcanization preparation process of full sea deep water sealed connector |
| CN114123691B (en) * | 2021-10-30 | 2022-11-08 | 中国长江动力集团有限公司 | Nimble detachable VPI device |
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| CN100570992C (en) * | 2007-06-06 | 2009-12-16 | 上海电气电站设备有限公司 | The method of the wrapped no latitude band in a kind of electric rotating machine end |
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