CN113232231A - Coil pouring system, coil pouring method, transformer coil and dry-type transformer - Google Patents
Coil pouring system, coil pouring method, transformer coil and dry-type transformer Download PDFInfo
- Publication number
- CN113232231A CN113232231A CN202110385028.1A CN202110385028A CN113232231A CN 113232231 A CN113232231 A CN 113232231A CN 202110385028 A CN202110385028 A CN 202110385028A CN 113232231 A CN113232231 A CN 113232231A
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- Prior art keywords
- coil
- transformer
- thermoplastic polyester
- sheet
- mixture
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Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229920000728 polyester Polymers 0.000 claims abstract description 35
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 35
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 239000003365 glass fiber Substances 0.000 claims abstract description 14
- 238000001746 injection moulding Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 238000001291 vacuum drying Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000008187 granular material Substances 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 22
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 15
- 238000002425 crystallisation Methods 0.000 claims description 8
- 230000008025 crystallization Effects 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 8
- 239000011256 inorganic filler Substances 0.000 claims description 7
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 7
- 239000002667 nucleating agent Substances 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 4
- 125000004185 ester group Chemical group 0.000 claims 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 13
- 229920001707 polybutylene terephthalate Polymers 0.000 description 11
- 239000003822 epoxy resin Substances 0.000 description 6
- 229920000647 polyepoxide Polymers 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- -1 Polyethylene terephthalate Polymers 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000005809 transesterification reaction Methods 0.000 description 4
- IJNCJYJSEFDKFC-UHFFFAOYSA-N N-[[4-methoxy-2-(trifluoromethyl)phenyl]methyl]-1-propanoylpiperidine-4-carboxamide Chemical compound COC1=CC(=C(CNC(=O)C2CCN(CC2)C(CC)=O)C=C1)C(F)(F)F IJNCJYJSEFDKFC-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/127—Encapsulating or impregnating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
A coil gating system, comprising: the vacuum drying machine is used for carrying out vacuum drying treatment on the thermoplastic polyester slices placed in the vacuum drying machine to obtain dried thermoplastic polyester slices; the high mixing machine is used for fully and uniformly mixing the dried thermoplastic polyester slices and preset substances in the high mixing machine to obtain a mixture; the extruding device is used for carrying out high-temperature melting treatment on the glass fiber and the mixture placed in the extruding device and extruding and granulating the glass fiber and the mixture; and the injection molding machine is provided with a mold with a coil, and is used for injecting the granules into the mold and solidifying the granules and the coil to obtain the transformer coil. The application also provides a coil pouring method, a transformer coil and a dry-type transformer.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a coil pouring system, a coil pouring method, a transformer coil and a dry-type transformer.
Background
The coil of the existing transformer is cast by epoxy resin. Although PET has excellent properties such as wear resistance, heat resistance, electrical insulation and chemical resistance, the epoxy resin has high fluidity during injection molding, so that PET has the disadvantages of slow crystallization rate, high temperature of a molding die, long molding period, poor impact property, high water absorption, low thermal deformation temperature and the like, and the defects correspondingly affect the casting quality of the transformer coil.
Disclosure of Invention
In view of the above, it is desirable to provide a coil casting system, a coil casting method, a transformer coil and a dry-type transformer, so as to obtain a high-quality transformer coil.
The application provides a coil gating system, includes:
the vacuum drying machine is used for carrying out vacuum drying treatment on the thermoplastic polyester slices placed in the vacuum drying machine to obtain dried thermoplastic polyester slices;
the high mixing machine is used for fully and uniformly mixing the dried thermoplastic polyester slices and preset substances in the high mixing machine to obtain a mixture;
the extruding device is used for carrying out high-temperature melting treatment on the glass fiber and the mixture placed in the extruding device and extruding and granulating the glass fiber and the mixture;
and the injection molding machine is provided with a mold with a coil, and is used for injecting the granules into the mold and solidifying the granules and the coil to obtain the transformer coil.
Further, the thermoplastic polyester sheet comprises a PET sheet and a PBT sheet.
Further, the predetermined substance is a combination of a nucleating agent, a crystallization promoter, a transesterification inhibitor and an inorganic filler.
Further, the extrusion device is a twin-screw extruder.
The application also provides a coil pouring method, which comprises the following steps:
carrying out vacuum drying treatment on the thermoplastic polyester sheet to obtain a dried thermoplastic polyester sheet;
fully and uniformly mixing the dried thermoplastic polyester sheet and a preset substance to obtain a mixture;
carrying out high-temperature melting treatment on the glass fiber and the mixture, and extruding and granulating;
and injecting the granules into a die with a coil, and solidifying the granules and the coil to obtain the transformer coil.
Further, the thermoplastic polyester sheet comprises a PET sheet and a PBT sheet.
Further, the predetermined substance is a combination of a nucleating agent, a crystallization promoter, a transesterification inhibitor and an inorganic filler.
The application also provides a transformer coil, and the transformer coil is obtained by adopting any coil casting method.
The application also provides a dry-type transformer, including above-mentioned transformer coil.
Furthermore, the dry-type transformer also comprises a transformer core and a fixing piece, wherein the transformer core is sleeved in the transformer coil, and the fixing piece is used for positioning the transformer coil and the transformer core.
The coil casting system and the coil casting method adopt the composite material comprising the glass fiber and the thermoplastic polyester to cast the coil in the mold, and compared with the prior art which adopts epoxy resin to cast, the coil casting system and the coil casting method have the advantages of low injection molding temperature, short molding period, better weather resistance, easy demolding and the like, thereby ensuring that the obtained transformer coil has better quality. The dry-type transformer has the transformer coil with better quality, so that the dry-type transformer provided by the application has better quality than the dry-type transformer in the prior art.
Drawings
Fig. 1 is a schematic view of a coil casting system provided in the present application.
Fig. 2 is a flowchart of a coil casting method provided in the present application.
Description of the main elements
| |
100 |
| |
200 |
| Vacuum drier | 10 |
| High- |
20 |
| |
30 |
| |
40 |
| |
11 |
| Dried thermoplastic polyester sheet | 11’ |
| |
111 |
| |
112 |
| Dried PET sheet | 111’ |
| Dried PBT sheet | 112’ |
| Mixture of | 25 |
| |
21 |
| |
22 |
| |
23 |
| |
24 |
| |
31 |
| |
32 |
| Die set | 41 |
| |
42 |
| |
300 |
| |
400 |
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
So that the manner in which the above recited objects, features and advantages of embodiments of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the invention, and the described embodiments are merely a subset of embodiments of the invention, rather than a complete embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present invention belong. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention.
Referring to fig. 1, the present application provides a coil casting system 100, wherein the coil casting system 100 is used for casting a coil to obtain a transformer coil 200. The coil casting system 100 includes a vacuum dryer 10, a high-speed mixer 20, an extrusion device 30, and an injection molding machine 40. The vacuum dryer 10, the high-speed mixer 20, the extrusion device 30, and the injection molding machine 40 sequentially process the raw materials placed therein to obtain the transformer coil 200.
The vacuum dryer 10 is used for performing vacuum drying treatment on the thermoplastic polyester sheet 11 placed in the vacuum dryer to obtain a dried thermoplastic polyester sheet 11', so as to improve the forming rate of the thermoplastic polyester sheet 11 in the subsequent forming process. The thermoplastic polyester sheet 11 may be a PET (Polyethylene terephthalate) sheet 111 or a PBT (Polybutylene terephthalate) sheet 112 or a combination of both. Correspondingly, the dried thermoplastic polyester sheet 11 ' is a dried PET sheet 111 ' or PBT sheet 112 ' or a combination of both.
The high-speed mixer 20 is used for fully and uniformly mixing the dried thermoplastic polyester chip 11' and the preset substances placed in the high-speed mixer to obtain a mixture 25. The preset substances are the combination of a nucleating agent 21, a crystallization promoter 22, a transesterification inhibitor 23 and an inorganic filler 24.
The extrusion device 30 is used for carrying out high-temperature melting treatment on the glass fiber 31 and the mixture 25 obtained by the treatment of the high-speed mixer 20, and extruding and granulating 32. In one embodiment, the extrusion apparatus 30 is a twin screw extruder.
The injection molding machine 40 is provided with a mold 41, and the mold 41 is provided with a coil 42. The injection molding machine 40 is used for injecting the pellets 32 into a mold 41 to solidify the pellets 32 and the coil 42 to obtain the transformer coil 200.
Because the casting raw material of the transformer coil 200 is a composite material comprising glass fiber and thermoplastic polyester such as PET or PBT, the composite material has higher dielectric strength than epoxy resin, better insulating property, better impact strength, high heat deformation temperature up to 220 ℃, strong acid and alkali corrosion resistance, and excellent electrical property, mechanical property, thermal property and environmental property, therefore, compared with the prior art in which epoxy resin is adopted for casting, the coil in the casting mold using the composite material has the advantages of low injection molding temperature, short molding period, better weather resistance, easy demolding and the like, thereby ensuring that the quality of the obtained transformer coil is better.
Referring to fig. 2, a flowchart of a coil casting method for forming a transformer coil according to the present invention is shown.
Step S1: the thermoplastic polyester sheet 11 placed in the vacuum dryer 10 is subjected to vacuum drying treatment to obtain a dried thermoplastic polyester sheet 11'.
The thermoplastic polyester sheet 11 may be a PET (Polyethylene terephthalate) sheet 111 or a PBT (Polybutylene terephthalate) sheet 112 or a combination of both. Correspondingly, the dried thermoplastic polyester sheet 11 ' is a dried PET sheet 111 ' or PBT sheet 112 ' or a combination of both.
Step S2: the dried thermoplastic polyester sheet 11' and the predetermined material placed therein are sufficiently and uniformly mixed by the high-speed mixer 20 to obtain a mixture 25. In one embodiment, the predetermined substance is a combination of a nucleating agent 21, a crystallization promoter 22, a transesterification inhibitor 23, and an inorganic filler 24.
Step S3: the glass fiber 31 and the mixture 25 are melted at a high temperature by the extrusion device 30 and extruded into pellets 32.
Step S4: the pellets 32 are injected into a mold 41 having a coil 42 by the injection molding machine 40, and the pellets 32 and the coil 42 are solidified to obtain a transformer coil 200.
Referring to fig. 1 again, the present invention further provides a dry-type transformer (not shown), which includes the transformer coil 200, the transformer core 300 and the fixing member 400. The transformer core 300 is sleeved in the transformer coil 200, and the fixing member 400 is used for positioning the transformer coil 200 and the transformer core 300, so as to ensure the stability of the transformer coil 200 and the transformer core 300.
The coil pouring system and the coil pouring method provided by the application adopt the coil in the composite material pouring mold comprising the glass fiber and the thermoplastic polyester, and compared with the prior art that epoxy resin is adopted for pouring, the coil pouring system and the coil pouring method have the advantages of low injection molding temperature, short forming period, better weather resistance, easiness in demolding and the like, so that the quality of the obtained transformer coil is better.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications of the above embodiments are within the scope of the disclosure claimed in the present application as long as they are within the spirit and scope of the present application.
Claims (10)
1. A coil gating system, comprising:
the vacuum drying machine is used for carrying out vacuum drying treatment on the thermoplastic polyester slices placed in the vacuum drying machine to obtain dried thermoplastic polyester slices;
the high mixing machine is used for fully and uniformly mixing the dried thermoplastic polyester slices and preset substances in the high mixing machine to obtain a mixture;
the extruding device is used for carrying out high-temperature melting treatment on the glass fiber and the mixture placed in the extruding device and extruding and granulating the glass fiber and the mixture;
and the injection molding machine is provided with a mold with a coil, and is used for injecting the granules into the mold and solidifying the granules and the coil to obtain the transformer coil.
2. The coil gating system of claim 1, wherein: the thermoplastic polyester sheet comprises a PET sheet and a PBT sheet.
3. The coil gating system of claim 1, wherein: the preset substance is the combination of a nucleating agent, a crystallization promoter, an ester exchange inhibitor and an inorganic filler.
4. The coil gating system of claim 1, wherein: the extrusion device is a double-screw extruder.
5. A coil casting method, comprising the steps of:
carrying out vacuum drying treatment on the thermoplastic polyester sheet to obtain a dried thermoplastic polyester sheet;
fully and uniformly mixing the dried thermoplastic polyester sheet and a preset substance to obtain a mixture;
carrying out high-temperature melting treatment on the glass fiber and the mixture, and extruding and granulating;
and injecting the granules into a die with a coil, and solidifying the granules and the coil to obtain the transformer coil.
6. The coil casting method according to claim 5, wherein: the thermoplastic polyester sheet comprises a PET sheet and a PBT sheet.
7. The coil casting method according to claim 5, wherein: the preset substance is the combination of a nucleating agent, a crystallization promoter, an ester exchange inhibitor and an inorganic filler.
8. A transformer coil, characterized by: the transformer coil is obtained by adopting the coil casting method according to any one of claims 5 to 7.
9. A dry-type transformer, characterized by: the dry-type transformer comprises the transformer coil of claim 8.
10. A dry transformer as claimed in claim 9, wherein: the transformer coil is sleeved with the transformer core, and the fixing piece is used for positioning the transformer coil and the transformer core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385028.1A CN113232231A (en) | 2021-04-09 | 2021-04-09 | Coil pouring system, coil pouring method, transformer coil and dry-type transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110385028.1A CN113232231A (en) | 2021-04-09 | 2021-04-09 | Coil pouring system, coil pouring method, transformer coil and dry-type transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113232231A true CN113232231A (en) | 2021-08-10 |
Family
ID=77127967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110385028.1A Pending CN113232231A (en) | 2021-04-09 | 2021-04-09 | Coil pouring system, coil pouring method, transformer coil and dry-type transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113232231A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010448A1 (en) * | 1996-09-04 | 1998-03-12 | E.I. Du Pont De Nemours And Company | High voltage transformer coil encapsulation process |
| JP2001324353A (en) * | 2000-05-16 | 2001-11-22 | Tamagawa Seiki Co Ltd | Method and structure for protecting winding of resolver |
| CN1789329A (en) * | 2005-12-13 | 2006-06-21 | 苏州市凯米克新材料有限公司 | High-performance reinforced fire-retardant polyster engineering plastic |
| CN1949633A (en) * | 2006-11-08 | 2007-04-18 | 卧龙电气集团股份有限公司 | Long stator core assembly packaging process |
-
2021
- 2021-04-09 CN CN202110385028.1A patent/CN113232231A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010448A1 (en) * | 1996-09-04 | 1998-03-12 | E.I. Du Pont De Nemours And Company | High voltage transformer coil encapsulation process |
| JP2001324353A (en) * | 2000-05-16 | 2001-11-22 | Tamagawa Seiki Co Ltd | Method and structure for protecting winding of resolver |
| CN1789329A (en) * | 2005-12-13 | 2006-06-21 | 苏州市凯米克新材料有限公司 | High-performance reinforced fire-retardant polyster engineering plastic |
| CN1949633A (en) * | 2006-11-08 | 2007-04-18 | 卧龙电气集团股份有限公司 | Long stator core assembly packaging process |
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| PB01 | Publication | ||
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Application publication date: 20210810 |