CN204516560U - Transformer - Google Patents
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- CN204516560U CN204516560U CN201520213647.2U CN201520213647U CN204516560U CN 204516560 U CN204516560 U CN 204516560U CN 201520213647 U CN201520213647 U CN 201520213647U CN 204516560 U CN204516560 U CN 204516560U
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Abstract
A kind of transformer, comprise iron core and be wound on the coil layer on iron core, the inside and outside surface coverage of coil layer described in each has insulating material; Described insulating material comprises glass layer, and the end at the surfaces externally and internally of described coil layer and vertically two ends is all held in described glass layer.Glass layer can form layer of glass-impregnating varnish insulating protective layer after vacuum pressure impregnation, coil layer is isolated from the outside and comes, and realizes the dustproof and waterproof effect of coil, strengthens the mechanical strength of whole coil layer simultaneously.
Description
Technical field
The utility model relates to a kind of transformer.
Background technology
As Fig. 1, transformer comprises stacking shaping 1a unshakable in one's determination, is wound on the lattice coil layer 1b on 1a unshakable in one's determination, and the insulating paper 1c between adjacent two coil layer.Coil carries out integral installation and joins formation transformer after completing, then the transformer assembled is carried out vacuum pressure impregnation (that is: treating that dipping lacquer workpiece is placed in a complete hermetic container, then by container vacuum-pumping, by pressure differential method, impregnating varnish is injected wherein, applying certain pressure again makes impregnating varnish soak into all gaps of workpiece thoroughly, reach the effect of dipping lacquer), wherein the material of impregnating varnish is generally resin.By vacuum pressure impregnation, make coil layer surface coverage one deck resin, then by curing process by resin solidification in coil layer surface, thus the mechanical strength of intensifier coil entirety greatly.
There is following shortcoming in above-mentioned transformer:
The first, owing to being placed with insulating paper between adjacent coil layers, impregnating varnish can not penetrate between coil layer completely;
The second, because impregnating varnish viscosity is not high, in the curing process because the contraction of resin causes completely the gap between coil layer and insulating paper being tamped.
Above 2 can cause coil can not obtain enough good sealing and easily make moist, and after coil makes moist, insulation property will reduce greatly, threaten the safe operation of product.If the coil of this type of power transformer product directly contacts with water, water can enter into coil inside along the gap between coil layer and insulating paper easily, thus makes coil lose insulation property and cannot run.That is, this type of power transformer product is making moist or can not run in water environment.
But in fact, because transformer ' s type product uses field extensive, operating condition is complicated, in some especial operation occasion, as subway, high ferro, locomotive etc., transformer ' s type product is often installed in vehicle bottom, is running into heavy rain, under the harsh environment scenarios such as heavy snow, the transformer being positioned at vehicle bottom is easy to into water.Therefore, in order to ensure that transformer ' s type product can normally run in rugged environment, as Fig. 2, traditional way is for transformer 1 designs a special cabinet 2, transformer 1 is installed and is sealed in cabinet 2, then the wire of transformer 1 input a and the wire of output b are caused outside cabinet 2, carry out the dustproof and waterproof process between wire and cabinet 2 simultaneously, make transformer 1 and the external world is completely isolated comes.According to the requirement of transformer dustproof and waterproof, the degree of protection of cabinet generally need reach IP65 (implication: prevent dust from entering completely is rinsed without any injury with water) or higher, to ensure to make the operation of transformer not by the impact of external environment.
The shortcoming of such scheme is:
The first, although the cabinet increased makes transformer can run in the environment having water, the design of cabinet is complicated, and manufacturing process difficulty is large, adds cost and product weight simultaneously;
The second, transformer is sealed in cabinet, makes the on-site installation and maintenance of transformer very inconvenient;
3rd, because transformer itself is a heater, operationally can produce a large amount of heats, transformer is placed in closed cabinet body by existing scheme, the heat causing it to produce cannot directly be distributed by outside air convection current, greatly reduce the radiating efficiency of transformer, affect the fail safe of product, stability and useful life.
Utility model content
The problem that the utility model solves is the water proof and dust proof poor performance of existing transformer coil.
For solving the problem, the utility model provides a kind of transformer, comprises iron core and is wound on the coil layer on iron core, and the inside and outside surface coverage of coil layer described in each has insulating material; Described insulating material comprises glass layer, and the end at the surfaces externally and internally of described coil layer and vertically two ends is all held in described glass layer.
Optionally, described glass layer comprises the multiturn glass tape being laid on described coil layer surface.
Optionally, the described glass tape held to each coil layer has multiturn, has overlapping part between adjacent two circle glass tapes.
Optionally, described insulating material also comprises insulating paper, is layed in inner surface and the outer surface of described coil layer respectively; Described insulating paper is positioned at the described glass layer side opposing with corresponding coil layer.
Optionally, described insulating paper higher than described coil layer, forms groove between the end of adjacent two insulating papers and the coil layer between described adjacent two insulating papers along the two ends of described coil layer axis; Be filled with glass fibre thing or chemical fibre thing in groove described at least one of corresponding coil layer described in each, described glass layer is paperwrapped in described glass fibre thing or chemical fibre beyond the region of objective existence.
Optionally, described glass fibre thing or chemical fibre thing fill full described groove.
Optionally, described chemical fibre thing comprises polyester fiber.
Optionally, described chemical fibre thing is felt.
Optionally, described coil layer two ends are vertically sealed by Embedding Material.
Compared with prior art, the technical solution of the utility model has the following advantages:
The surfaces externally and internally of coil layer and end are all held in described glass layer, in vacuum pressure impregnation technique, because the material of glass fibre itself has a lot of space, can adsorptive paint well when dipping lacquer, and can be combined well with it after impregnating varnish solidification, form layer of glass-impregnating varnish insulating protective layer, coil layer is isolated from the outside and comes, realize the dustproof and waterproof effect of coil; Meanwhile, glass layer can provide a skeleton for impregnating varnish, prevents impregnating varnish from ftractureing in the curing process, thus also strengthens the mechanical strength of whole coil layer.
Further, the surfaces externally and internally of coil layer lays insulating paper respectively, and in dipping lacquer process, insulating paper also can adsorb certain impregnating varnish, thus strengthens the dustproof and waterproof performance of coil.
Further; filled glass fiber thing or chemical fibre thing in the groove formed between insulating paper and coil layer end; and be paperwrapped in glass layer; space between coil layer end and insulating paper is tamped; in dipping lacquer process, glass fibre thing or chemical fibre thing can adsorptive paints fully, after paint solidification to be impregnated; the glass fibre thing of adsorptive paint or chemical fibre thing, by having higher mechanical strength and good insulation property, become the protective layer of coil layer end.
Further, get up with the end part seal of Embedding Material by coil layer, to fill up the localized voids that coil layer may be left over when dipping lacquer, the dustproof and waterproof performance of further line feeder ring layer; In addition, after the embedding of coil layer end, end is smooth attractive in appearance, improves the outward appearance of power transformer product.
Accompanying drawing explanation
Fig. 1 is the axial cutaway view of existing transformer;
Fig. 2 is the schematic diagram that existing transformer is contained in cabinet;
Fig. 3 is the axial cutaway view of the utility model transformer;
Fig. 4 is the cross-sectional structure schematic diagram of a coil layer in the utility model transformer, illustrated therein is the insulating material be positioned at outside coil layer;
Fig. 5 is the enlarged drawing of part A in Fig. 4.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage more become apparent, and are described in detail specific embodiment of the utility model below in conjunction with accompanying drawing.
The utility model embodiment provides a kind of transformer, with reference to Fig. 3, and the coil layer 20 comprising unshakable in one's determination 10 and be wound on unshakable in one's determination 10.Wherein, coil layer 20 can adopt multiple material to make, such as, copper (aluminium) line or copper (aluminium) paper tinsel can be adopted to make.Under normal circumstances, the coil layer 20 be wound on unshakable in one's determination 10 has multilayer, mutually insulated between adjacent two coil layer 20.
Shown in Fig. 3 composition graphs 4, each coil layer 20 has inner surface, outer surface and the end along axial (in the figure Y-direction) two ends of coil layer, and the inside and outside surface coverage of each coil layer 20 has insulating material 30.
Shown in composition graphs 5, insulating material 30 comprises glass layer 31, and the surfaces externally and internally of coil layer 20 and end are all held in glass layer 31.In the present embodiment, glass layer 31 is glass tape, holds and has multiturn to the glass tape in each coil layer 20, have overlapping part between adjacent two circle glass tapes.
When holding, before coiling layer, first glass tape is placed in advance, generally by multiturn glass tape being circumferentially arranged and laying along coil layer.After coil winding completes and forms coil layer, then by every circle glass tape axially the whole surfaces externally and internally of coil layer and end are all held along coil layer.It should be noted that as preventing bottom pour ladle, when laying glass tape, between adjacent glass silk ribbon, should overlap be had, generally mutually overlap several millimeters by between adjacent glass silk ribbon.
Compared with traditional coil; the transformer of the present embodiment adds glass layer on coil; the surfaces externally and internally of coil layer and end is made all to be held in described glass layer; because the material of glass fibre itself has a lot of space; in vacuum pressure impregnation technique; glass tape can adsorptive paint well; and can be combined well with it after impregnating varnish solidification; form one deck glass tape-impregnating varnish insulating protective layer; coil layer is isolated from the outside and comes, realize the dustproof and waterproof effect of coil.Meanwhile, the glass layer that glass tape is formed for being provided a skeleton by the impregnating varnish adsorbed, can prevent impregnating varnish from ftractureing in the curing process, thus also strengthens the mechanical strength of whole coil layer.
In other embodiments, glass layer 31 can also be adopt the other forms of fiberglass products such as yarn, cloth.
Further, continue with reference to Fig. 5, insulating material 30 also comprises insulating paper 32, is layed in inner surface and the outer surface of coil layer 20 respectively, and insulating paper 32 is positioned at glass layer 31 side opposing with corresponding coil layer 30.The insulating paper 32 being wherein layed in coil layer 20 inner surface can be called bottoming insulating paper, and the insulating paper 32 being layed in coil layer 20 outer surface can be called outer layer insulation paper, and outer layer insulation paper is simultaneously as the bottoming insulating paper of the coil layer of lower one deck coiling.In dipping lacquer process, insulating paper also can adsorb certain impregnating varnish, thus strengthens the dustproof and waterproof performance of coil.It should be noted that and add man-hour, the bottoming insulating paper of same coil layer 20 should place before laying glass layer 31 or coiling good.
As Fig. 5, the insulation system of coil layer determines insulating paper 32 and must exceed coil layer two ends along coil layer axial (in figure Y-direction), has difference in height d between the end of insulating paper 32 and the corresponding end of coil layer 20.If difference in height d is too small or even do not have this difference in height d, such as coil layer 20 is concordant with the end of insulating paper 32, so, when transformer works, between different coil layer 20, there is voltage difference, to occur due to voltage difference creepage between adjacent coil layers 20, thus cause high-voltage line ring layer to be discharged to low-voltage line ring layer.By this difference in height d, the creepage distance between coil layer 20 can be increased, avoid electric discharge phenomena.
As mentioned above, due to insulating paper 32 along the two ends of coil layer 20 axially (in figure Y-direction) higher than coil layer 20, so, form a groove g between the end of adjacent two insulating papers 32 and the coil layer 20 between adjacent two insulating papers 32, namely the bottoming insulating paper of same coil layer 20, form groove g between the raised area of outer layer insulation paper and the end of this coil layer 20.After water or steam enter groove g, be easy to enter into coil inside from gap between coil layer 20 and insulating paper 32, affect the work of transformer.
Because the space of groove g is comparatively large, and the thickness of glass tape itself is less, only cannot filling groove g with the glass tape holding coil layer.In order to solve the problem, the present embodiment is filled glass fiber thing or chemical fibre thing in groove g, and glass layer 31 is paperwrapped in glass fibre thing or the chemical fibre beyond the region of objective existence of filling.In dipping lacquer process; glass fibre thing or chemical fibre thing can adsorptive paints fully; after paint solidification to be impregnated; the glass fibre thing of adsorptive paint or chemical fibre thing will have higher mechanical strength and good insulation property; become the protective layer of coil layer end, anti-sealing or steam enter into coil.
Wherein, glass fibre thing or chemical fibre thing fill full groove g, and the space between coil layer 20 end is tamped.Chemical fibre thing can be polyester fiber, or comprises polyester fiber.For the ease of processing, the felt that the present embodiment adopts polyester fiber to make carrys out filling groove g.Felt materials itself is more fluffy; internal voids is comparatively large, fully can absorb impregnating varnish when dipping lacquer, after paint solidification to be impregnated; the felt of adsorptive paint then becomes the protective layer of coil layer end, and the mechanical strength of felt after adsorptive paint also can increase greatly simultaneously.Particularly, for specific one deck coil layer 20, before glass tape holds whole coil layer 20, felt is placed in advance in the end of coil layer 20, then in glass tape felt being surrounded, after glass tape has held, felt has also been fixedly secured to the end of coil layer 20.
In other embodiments, as long as can adsorptive paint fully, the intensity of the final structure formed and insulation property are met the demands, glass fibre thing or chemical fibre thing also can not fill full groove, such as, also leave certain difference in height between glass fibre thing after filling or chemical fibre thing surface and insulating paper.
Further, coil layer 20 two ends are vertically sealed by Embedding Material.This is larger owing to considering the space of coil layer end, fill felt or hold glass tape process in may there is local defect point, such as space, and the water resistance of whole transformer was lost efficacy, therefore, the present embodiment is after dipping lacquer completes, again integral end envelope (end part seal) process is carried out to the end of coil layer 20, namely adopt encapsulating material all to be sealed by end winding, localized voids to be tamped, strengthen the water resistance of coil further.In addition, after the overall embedding in coil layer 20 end, whole overhang is smooth attractive in appearance, improves the outward appearance of power transformer product.
In order to verify the waterproof effect of the coil of the present embodiment transformer, the present embodiment has done different tests to transformer:
Test a waterproof sealing performance test
Be immersed in by transformer in water, quietly put 24 hours, after 24 hours, transformer is taken out, the insulating resistance value of measuring coil also carries out power frequency withstand test, compares assessment by before test result and immersion simultaneously.
As requested, coil insulating resistance value before and after immersion need be greater than 100M Ω.Power frequency pressure test requirements document simultaneously can not produce electric discharge phenomena.After tested, the transformer of the present embodiment is in immersion after 24 hours, and the insulating resistance value of coil is far longer than 100M Ω, simultaneously power frequency withstand test discharge off, and this also illustrates that the waterproof sealing performance of coil is good, produces a desired effect.
Test two thermal shock performance tests
In general, the insulation grade anti-corrosion of transformer is H level (180 DEG C), when transformer normally runs, temperature can reach 130 ~ 150 degree, when transformer intakes suddenly (the same ambient temperature of water temperature) in normal course of operation, coil bears strong thermal shock by being subject to, the insulation system on each surface of coil layer may be caused to occur gap or cracking, especially hold seal structure.Consider extreme running environment, carried out 10-25 DEG C ~ 180 DEG C cold shock testings to the transformer of this enforcement below, its test procedure is as follows:
1. transformer is placed in baking oven keep 180 DEG C 6 hours;
2. take out transformer and put into rapidly-25 DEG C of cryogenic boxes 6 hours;
3. repeat said process 10 times;
4. take out transformer after cold shock testing and check the outward appearance of coil, the insulation resistance of test coil also carries out power frequency withstand test;
5. Total Product is immersed in the water and quietly puts 1 hour, then get the insulation resistance of transformer testing coil and carry out power frequency withstand test.
Checking coil outward appearance after cold shock testing, do not note abnormalities, there is not cracking or pore in end winding and surfaces externally and internally, and insulation resistance and power frequency withstand test all pass through simultaneously.
Its insulation resistance of test after coil immersion, its value, much larger than 100M, carries out power frequency withstand test, also discharge off phenomenon simultaneously again, so the insulation property after product immersion also all meet service requirement.
By above test, illustrate that the coil waterproof of the present embodiment transformer reaches expection requirement completely, humidity or water environment can be directly used in.
Although the utility model discloses as above, the utility model is not defined in this.Any those skilled in the art, not departing from spirit and scope of the present utility model, all can make various changes or modifications, and therefore protection range of the present utility model should be as the criterion with claim limited range.
Claims (9)
1. a transformer, comprises iron core and is wound on the coil layer on iron core, and the inside and outside surface coverage of coil layer described in each has insulating material;
It is characterized in that, described insulating material comprises glass layer, and the end at the surfaces externally and internally of described coil layer and vertically two ends is all held in described glass layer.
2. transformer as claimed in claim 1, it is characterized in that, described glass layer comprises the multiturn glass tape being laid on described coil layer surface.
3. transformer as claimed in claim 2, it is characterized in that, the described glass tape held to each coil layer has multiturn, has overlapping part between adjacent two circle glass tapes.
4. transformer as claimed in claim 1, it is characterized in that, described insulating material also comprises insulating paper, is layed in inner surface and the outer surface of described coil layer respectively;
Described insulating paper is positioned at the described glass layer side opposing with corresponding coil layer.
5. transformer as claimed in claim 4, is characterized in that, described insulating paper higher than described coil layer, forms groove between the end of adjacent two insulating papers and the coil layer between described adjacent two insulating papers along the two ends of described coil layer axis;
Be filled with glass fibre thing or chemical fibre thing in groove described at least one of corresponding coil layer described in each, described glass layer is paperwrapped in described glass fibre thing or chemical fibre beyond the region of objective existence.
6. transformer as claimed in claim 5, is characterized in that, described glass fibre thing or chemical fibre thing fill full described groove.
7. transformer as claimed in claim 6, it is characterized in that, described chemical fibre thing comprises polyester fiber.
8. transformer as claimed in claim 7, it is characterized in that, described chemical fibre thing is felt.
9. the transformer as described in any one of claim 1-8, is characterized in that, described coil layer two ends are vertically sealed by Embedding Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520213647.2U CN204516560U (en) | 2015-04-10 | 2015-04-10 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520213647.2U CN204516560U (en) | 2015-04-10 | 2015-04-10 | Transformer |
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|---|---|
| CN204516560U true CN204516560U (en) | 2015-07-29 |
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| CN201520213647.2U Active CN204516560U (en) | 2015-04-10 | 2015-04-10 | Transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111968848A (en) * | 2020-08-17 | 2020-11-20 | 长兴盛强电子器材股份有限公司 | Production process of power frequency transformer |
| CN113130190A (en) * | 2021-03-18 | 2021-07-16 | 上海波亮电器制造有限公司 | Air-core reactor, manufacturing equipment and manufacturing method thereof |
| CN117476350A (en) * | 2023-10-16 | 2024-01-30 | 浙江中能变压器有限公司 | Corrosion prevention technology of novel wind power dry-type transformer |
-
2015
- 2015-04-10 CN CN201520213647.2U patent/CN204516560U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111968848A (en) * | 2020-08-17 | 2020-11-20 | 长兴盛强电子器材股份有限公司 | Production process of power frequency transformer |
| CN113130190A (en) * | 2021-03-18 | 2021-07-16 | 上海波亮电器制造有限公司 | Air-core reactor, manufacturing equipment and manufacturing method thereof |
| CN117476350A (en) * | 2023-10-16 | 2024-01-30 | 浙江中能变压器有限公司 | Corrosion prevention technology of novel wind power dry-type transformer |
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