JPH032328B2 - - Google Patents
Info
- Publication number
- JPH032328B2 JPH032328B2 JP58085898A JP8589883A JPH032328B2 JP H032328 B2 JPH032328 B2 JP H032328B2 JP 58085898 A JP58085898 A JP 58085898A JP 8589883 A JP8589883 A JP 8589883A JP H032328 B2 JPH032328 B2 JP H032328B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- mold
- foaming
- urethane resin
- foamable urethane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229920005989 resin Polymers 0.000 claims description 27
- 239000011347 resin Substances 0.000 claims description 27
- 238000000465 moulding Methods 0.000 claims description 25
- 238000005187 foaming Methods 0.000 claims description 19
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
- H01F41/005—Impregnating or encapsulating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transformers For Measuring Instruments (AREA)
- Insulating Of Coils (AREA)
Description
【発明の詳細な説明】
本発明は、低圧モールド形変成器や低圧モール
ド形計器用変圧器の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a low voltage molded transformer and a low voltage molded potential transformer.
従来の低圧モールド形変成器の製造方法は、ま
ず鉄心の周囲に絶縁層を兼ねる緩衝層を設けて、
樹脂硬化時の硬化歪が鉄心特性に影響を及ぼすの
を防ぎ、その上にコイルを巻いて変流器素子を形
成し、この変流器素子をモールド用金型内の所定
位置に装着した後、金型の樹脂注入口よりエポキ
シ樹脂を注入し、硬化させるものであつた。この
製造方法によると、緩衝層を設けるのに手間が掛
かること及び樹脂の硬化離型時間が長いことのた
めに、原価低減が困難であつた。 The conventional manufacturing method for low-voltage molded transformers is to first provide a buffer layer that also serves as an insulating layer around the iron core.
After preventing the curing strain caused by resin curing from affecting the core properties, winding a coil on top of it to form a current transformer element, and installing this current transformer element in a predetermined position within the molding die. , the epoxy resin was injected through the resin injection port of the mold and allowed to harden. According to this manufacturing method, it is difficult to reduce the cost because it takes time and effort to provide the buffer layer and the resin hardens and releases from the mold for a long time.
また、モールド樹脂としてウレタン樹脂を使用
した場合には、エポキシ樹脂の場合に比べて鉄心
歪の影響は低減され、硬化時間も短くなるが、樹
脂の使用量及び単価は同等なので、やはり原価の
低減は困難であつた。 In addition, when urethane resin is used as the molding resin, the effect of core distortion is reduced and the curing time is shorter than when using epoxy resin, but the amount of resin used and unit price are the same, so the cost is still reduced. was difficult.
本発明の目的は、上述した問題点を解決し、モ
ールド樹脂の硬化歪の影響をなくし、硬化離型時
間を短縮すると共に、モールド樹脂の使用量を低
減することができる低圧モールド形変成器の製造
方法を提供することである。 The purpose of the present invention is to solve the above-mentioned problems, eliminate the influence of curing distortion of mold resin, shorten curing mold release time, and provide a low-pressure molded transformer that can reduce the amount of mold resin used. An object of the present invention is to provide a manufacturing method.
この目的を達成するために、本発明は、モール
ド樹脂として発泡性ウレタン樹脂を用い、モール
ド用金型を発泡性ウレタン樹脂の発泡温度より低
い温度に予熱し、均一発泡に要する量より多い量
の発泡性ウレタン樹脂をモールド用金型内に注入
口から注入し、注入口を閉じて、発泡性ウレタン
樹脂の発泡が完了した後、加熱し、以て、モール
ド樹脂殻の表面部分を無発泡状態にし、モールド
樹脂殻の内側部分を発泡状態にすることを特徴と
する。 In order to achieve this object, the present invention uses a foamable urethane resin as a mold resin, preheats the molding die to a temperature lower than the foaming temperature of the foamable urethane resin, and uses a foaming resin in an amount larger than that required for uniform foaming. The foamable urethane resin is injected into the molding die through the injection port, the injection port is closed, and after the foaming of the foamable urethane resin is completed, it is heated, thereby leaving the surface portion of the mold resin shell in an unfoamed state. It is characterized by making the inner part of the mold resin shell into a foamed state.
以下、本発明を図面によつて詳細に説明する。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１〜８図は本発明による貫通型の低圧モール
ド形変成器の製造方法を示し、第９〜１０図は製
造された低圧モールド形変成器を示す。 1-8 show a method of manufacturing a through-type low-voltage molded transformer according to the present invention, and FIGS. 9-10 show the manufactured low-voltage molded transformer.
第１図に示されるように、角形巻鉄心１の周囲
を、樹脂コーテイング層、又は絶縁テープなどの
絶縁層２で絶縁し、その上に２次コイル３を巻
く。角形巻鉄心１の左右両側に、第２〜３図に示
される鉄心締枠４をスポツト溶接により固定す
る。スポツト溶接は、スポツト溶接用に設けられ
た小穴５の部分に行う。鉄心締枠４の前後面に、
ねじ穴６を有するボス７を溶接する。このボス７
は、モールド完了後、取付脚金具（図示せず）が
ねじをねじ穴にねじ込むことにより固定されるも
のである。このようにして、第４〜５図に示され
る変流器素子８を形成する。９はスポツト溶接部
分である。 As shown in FIG. 1, the periphery of a rectangular wound core 1 is insulated with an insulating layer 2 such as a resin coating layer or an insulating tape, and a secondary coil 3 is wound thereon. Core clamping frames 4 shown in FIGS. 2 and 3 are fixed to the left and right sides of the rectangular wound core 1 by spot welding. Spot welding is performed in the small holes 5 provided for spot welding. On the front and rear surfaces of the iron core clamping frame 4,
A boss 7 having a screw hole 6 is welded. this boss 7
After molding is completed, the mounting leg fittings (not shown) are fixed by screwing screws into the screw holes. In this way, the current transformer element 8 shown in FIGS. 4-5 is formed. 9 is a spot welded portion.
変流器素子８をモールドするために、第６図〜
８図に示されるように、変流器素子８をモールド
用金型１０，１１内に装着する。まず、一方のモ
ールド用金型１１を上向きに置き、ボス７がモー
ルド用金型１１の内面に接し、鉄心窓１２（第４
図）が長方形の突出部１３に嵌まり込むように、
変流器素子８をモールド用金型１１の内部に配置
する。モールド用金型１１に２次端子ねじ金具１
４をボルト１５で取り付け、２次コイル３の口出
線１６を２次端子ねじ金具１４に接続する。次に
モールド用金型１０をモールド用金型１１に合わ
せ、４本のボルト１７をボス７のねじ穴６に、ボ
ス７の端面がモールド用金型１０の内面に当接す
るまでねじ込み、変流器素子８の位置決めを行
う。モールド用金型１０，１１の突出部１８，１
３に設けられたボルト貫通孔１９，２０にボルト
２１を通し、ナツト２２にねじ込むことにより両
モールド用金型１０，１１を締め付け、固定す
る。これによつて、変流器素子８とモールド用金
型１０，１１の内面との間に、所定の肉厚のモー
ルド樹脂殻を形成するための空隙部２３が所定寸
法に保持される。突出部１３，１８は１次導体貫
通窓を形成するためのものである。 In order to mold the current transformer element 8, FIG.
As shown in FIG. 8, the current transformer element 8 is mounted in molding dies 10 and 11. First, one molding die 11 is placed facing upward, so that the boss 7 is in contact with the inner surface of the molding die 11, and the iron core window 12 (the fourth
) so that it fits into the rectangular protrusion 13.
The current transformer element 8 is placed inside the molding die 11. Secondary terminal screw fitting 1 in molding die 11
4 with bolts 15, and connect the lead wire 16 of the secondary coil 3 to the secondary terminal screw fitting 14. Next, align the molding die 10 with the molding die 11, screw the four bolts 17 into the screw holes 6 of the boss 7 until the end surface of the boss 7 abuts the inner surface of the molding die 10, and The device element 8 is positioned. Projecting parts 18, 1 of molding dies 10, 11
The bolts 21 are passed through the bolt through holes 19 and 20 provided in the bolts 3 and screwed into the nuts 22 to tighten and fix both the molding dies 10 and 11. As a result, a gap 23 for forming a mold resin shell of a predetermined thickness is maintained at a predetermined size between the current transformer element 8 and the inner surfaces of the molding dies 10 and 11. The protrusions 13 and 18 are for forming a primary conductor through window.
両モールド用金型１０，１１には、その合わせ
目を中心として注入口２４が設けられ、注入口２
４は注入口蓋２５により閉じられる。閉じられた
時の注入口蓋２５の先端面は、モールド用金型１
０，１１の内面に一致する。 The molds 10 and 11 for both molds are provided with an injection port 24 centered at the joint.
4 is closed by an injection port cover 25. The tip end surface of the injection port cover 25 when closed is the molding die 1
Matches the inner surface of 0,11.
変流器素子８が装着されたモールド用金型１
０，１１を、発泡性ウレタン樹脂の発泡温度より
低い温度（約40〜50度）に予熱する。予熱後、注
入口２４を上向きにして、注入口２４から発泡性
ウレタン樹脂を注入する。発泡性ウレタン樹脂の
量は、均一発泡に要する量より多い量に定められ
る。具体的には、空隙部２３の30〜40％程度の量
が最適である。 Mold die 1 with current transformer element 8 installed
0.11 to a temperature lower than the foaming temperature of the foamable urethane resin (approximately 40 to 50 degrees). After preheating, the foamable urethane resin is injected from the injection port 24 with the injection port 24 facing upward. The amount of foamable urethane resin is determined to be greater than the amount required for uniform foaming. Specifically, an amount of about 30 to 40% of the void portion 23 is optimal.
注入後、注入口蓋２５を注入口２４に差し込
み、発泡による内圧上昇に対し外れないように固
定する。約10分経過すると、発泡は完了するの
で、約80度の炉に約30分入れて、硬化を終了させ
た後、離型する。このようにして出来あがつた変
流器は、第９〜１０図に示される。２６はモール
ド樹脂殻、２７は１次導体貫通窓、２８は２次端
子台、２９は２次端子ねじである。 After injection, the injection port cover 25 is inserted into the injection port 24 and fixed so as not to come off due to the increase in internal pressure due to foaming. After about 10 minutes, foaming will be completed, so put it in an oven at about 80 degrees for about 30 minutes to finish curing, and then release it from the mold. The current transformer thus completed is shown in FIGS. 9 and 10. 26 is a molded resin shell, 27 is a primary conductor through window, 28 is a secondary terminal block, and 29 is a secondary terminal screw.
モールド樹脂殻２６の表面部分は硬い無発泡状
態になり、モールド樹脂殻２６の内側部分は軟ら
かい発泡状態になる。その理由は、発泡性ウレタ
ン樹脂の量が均一発泡に要する量より多い量に定
められること、モールド用金型１０，１１が発泡
温度より低く予熱されているので、表面部分は発
泡による温度がモールド用金型１０，１１に逃
げ、発泡に必要な温度に上昇しないこと、内側部
分が先に発泡し、それによつて生じる圧力が表面
部分に掛かり、表面部分の発泡を抑えること、で
ある。 The surface portion of the molded resin shell 26 is in a hard non-foamed state, and the inner portion of the molded resin shell 26 is in a soft foamed state. The reason for this is that the amount of foamable urethane resin is set to be greater than the amount required for uniform foaming, and because the molding dies 10 and 11 are preheated to a temperature lower than the foaming temperature, the temperature of the surface portion due to foaming is lower than that of the mold. The temperature must not rise to the temperature required for foaming by escaping into the molds 10 and 11, and the inside portion must foam first, and the resulting pressure must be applied to the surface portion to suppress foaming at the surface portion.
モールド樹脂殻２６の表面部分が無発泡状態
で、適度の硬度を持つた平滑仕上がりとなるの
で、外観は普通のモールド樹脂殻と全く同様であ
る。モールド樹脂殻２６の内側部分が発泡状態で
あるので、角形巻鉄心１に対する硬化歪は全く掛
からず、緩衝層を省くことができる。また、発泡
性ウレタン樹脂を使用するために、使用量が小量
でよいことになり、軽量化、材料費の低減、工数
の低減、硬化離型時間の短縮などを計ることがで
きる。しかも、角形巻鉄心１と２次コイル３との
間は絶縁層２で絶縁され、外殻はウレタン樹脂で
絶縁されているので、絶縁的には全く問題ない。 Since the surface portion of the molded resin shell 26 is unfoamed and has a smooth finish with appropriate hardness, the appearance is exactly the same as that of an ordinary molded resin shell. Since the inner part of the molded resin shell 26 is in a foamed state, no curing strain is applied to the rectangular wound iron core 1, and a buffer layer can be omitted. Furthermore, since the foamable urethane resin is used, only a small amount is required, which makes it possible to reduce weight, reduce material costs, reduce man-hours, and shorten curing and demolding time. Moreover, since the rectangular wound core 1 and the secondary coil 3 are insulated by the insulating layer 2, and the outer shell is insulated by urethane resin, there is no problem in terms of insulation.
以上説明した実施例では、取付脚金具との連結
用のボス７を、モールド用金型１０，１１内での
位置決めに用いているので、位置決めに関するコ
ストダウンを計ることができるが、これに限定さ
れるものではなく、スペーサなどにより位置決め
するようにしてもよい。 In the embodiment described above, the boss 7 for connection with the mounting leg fitting is used for positioning within the molding dies 10, 11, so it is possible to reduce the cost related to positioning, but this is not limited to this. Instead, the positioning may be performed using a spacer or the like.
本発明は、貫通型の低圧モールド形変流器には
限らず、１次コイルを含めてモールドした構造の
巻線型の低圧モールド形変成器や、低圧モールド
計器用変圧器にも適用することができる。 The present invention is not limited to a through-type low-voltage molded current transformer, but can also be applied to a wire-wound type low-voltage molded transformer with a molded structure including the primary coil, and a low-voltage molded instrument transformer. can.
以上説明したように、本発明によれば、モール
ド樹脂として発泡性ウレタン樹脂を用い、モール
ド用金型を発泡性ウレタン樹脂の発泡温度より低
い温度に予熱し、均一発泡に要する量より多い量
の発泡性ウレタン樹脂をモールド用金型内に注入
口から注入し、注入口を閉じて、発泡性ウレタン
樹脂の発泡が完了した後、加熱し、以て、モール
ド樹脂殻の表面部分を無発泡状態にし、モールド
樹脂殻の内側部分を発泡状態にするようにしたか
ら、モールド樹脂の硬化歪の影響をなくし、硬化
離型時間を短縮すると共に、モールド樹脂の使用
量を低減することができる。したがつて、原価を
低減することができる。 As explained above, according to the present invention, a foamable urethane resin is used as the mold resin, the molding die is preheated to a temperature lower than the foaming temperature of the foamable urethane resin, and an amount larger than that required for uniform foaming is produced. The foamable urethane resin is injected into the molding die through the injection port, the injection port is closed, and after the foaming of the foamable urethane resin is completed, it is heated, thereby leaving the surface portion of the mold resin shell in an unfoamed state. Since the inner part of the mold resin shell is made into a foamed state, it is possible to eliminate the influence of curing distortion of the mold resin, shorten the curing mold release time, and reduce the amount of mold resin used. Therefore, cost can be reduced.
第１図は本発明の一実施例における鉄心及び２
次コイルの組立体を示す一部断面正面図、第２図
及び第３図は同じく鉄心締枠を示す正面図及び側
面図、第４図及び第５図は同じく変流器素子を示
す正面図及び平面図、第６図〜８図は同じく変流
器素子が装着されたモールド用金型を示す正面
図、側面図及び第６図Ａ−Ａ線における断面図、
第９図及び第１０図は本発明の一実施例により製
造された低圧モールド形変流器を示す正面図及び
側面図である。
１……角形巻鉄心、３……２次コイル、７……
ボス、８……変流器素子、１０，１１……モール
ド用金型、１３，１８……突出部、１４……２次
端子ねじ金具、１７……ボルト、２１……ボル
ト、２２……ナツト、２３……空隙部、２４……
注入口、２５……注入口蓋、２６……モールド樹
脂殻、２７……１次導体貫通窓、２９……２次端
子ねじ。
FIG. 1 shows an iron core and two in one embodiment of the present invention.
2 and 3 are front and side views showing the core clamping frame, and 4 and 5 are front views showing the current transformer element. and a plan view, and FIGS. 6 to 8 are a front view, a side view, and a sectional view taken along the line A-A in FIG.
FIGS. 9 and 10 are a front view and a side view of a low-pressure molded current transformer manufactured according to an embodiment of the present invention. 1... Square wound core, 3... Secondary coil, 7...
Boss, 8...Current transformer element, 10, 11...Molding die, 13, 18...Protrusion, 14...Secondary terminal screw fitting, 17...Bolt, 21...Bolt, 22... Nut, 23...Gap, 24...
Inlet, 25... Inlet cover, 26... Molded resin shell, 27... Primary conductor penetration window, 29... Secondary terminal screw.
Claims (1)
素子を形成し、該変成器素子をモールド用金型内
の所定位置に装着し、モールド樹脂をモールド用
金型内に注入し、加熱により硬化させた後、離型
する低圧モールド形変成器の製造方法において、
モールド樹脂として発泡性ウレタン樹脂を用い、
モールド用金型を発泡性ウレタン樹脂の発泡温度
より低い温度に予熱し、均一発泡に要する量より
多い量の発泡性ウレタン樹脂をモールド用金型内
に注入口から注入し、注入口を閉じて、発泡性ウ
レタン樹脂の発泡が完了した後、加熱するように
したことを特徴とする低圧モールド形変成器の製
造方法。1. A transformer element is formed by winding a coil on an insulated iron core, the transformer element is mounted at a predetermined position in a molding die, a molding resin is injected into the molding die, and the transformer element is heated. In a method for manufacturing a low-pressure mold type transformer that is cured and then released from the mold,
Using foamable urethane resin as mold resin,
Preheat the mold to a temperature lower than the foaming temperature of the foamable urethane resin, inject a larger amount of foamable urethane resin into the mold through the injection port than is required for uniform foaming, and close the injection port. A method for manufacturing a low-pressure mold type transformer, characterized in that heating is performed after foaming of the foamable urethane resin is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58085898A JPS59213115A (en) | 1983-05-18 | 1983-05-18 | Manufacture of low voltage molded transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58085898A JPS59213115A (en) | 1983-05-18 | 1983-05-18 | Manufacture of low voltage molded transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59213115A JPS59213115A (en) | 1984-12-03 |
| JPH032328B2 true JPH032328B2 (en) | 1991-01-14 |
Family
ID=13871684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58085898A Granted JPS59213115A (en) | 1983-05-18 | 1983-05-18 | Manufacture of low voltage molded transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59213115A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07272952A (en) * | 1994-03-31 | 1995-10-20 | Matsushita Electric Ind Co Ltd | Molded transformer |
| US20070241852A1 (en) * | 2006-04-14 | 2007-10-18 | Goudreau Joel S | Transformer with foamed insulating material and method of manufacturing the same |
| JP2011228445A (en) * | 2010-04-19 | 2011-11-10 | Toyota Industries Corp | Reactor |
| JP2011228444A (en) * | 2010-04-19 | 2011-11-10 | Toyota Industries Corp | Reactor |
-
1983
- 1983-05-18 JP JP58085898A patent/JPS59213115A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59213115A (en) | 1984-12-03 |
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