JPH09322496A - Furnace and method for drying motor under maintenance - Google Patents
Furnace and method for drying motor under maintenanceInfo
- Publication number
- JPH09322496A JPH09322496A JP13685096A JP13685096A JPH09322496A JP H09322496 A JPH09322496 A JP H09322496A JP 13685096 A JP13685096 A JP 13685096A JP 13685096 A JP13685096 A JP 13685096A JP H09322496 A JPH09322496 A JP H09322496A
- Authority
- JP
- Japan
- Prior art keywords
- electric motor
- furnace
- drying
- maintenance
- vacuum
- 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.)
- Granted
Links
Landscapes
- Drying Of Solid Materials (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、整備電動機の乾燥
炉及び乾燥方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying oven and a drying method for a maintenance electric motor.
【０００２】[0002]
【従来の技術】鋼材圧延機等を駆動する電動機（ミルモ
ーター）は、重量で１０ｔ以上（出力で１０００ＫＷ以
上）と大型になる。このような電動機は、圧延機の稼動
経時とともに、絶縁物の劣化が進行することから診断に
よって絶縁向上対策工事の時期を決定し、この決定に基
づき絶縁向上対策工事を施すものである。この工事は、
まず電動機の回転子を外し２分割にして、それぞれ蒸気
を吹付け絶縁物の油汚れ、塵、ブラシ粉等を洗浄除去し
た後乾燥する。しかる後、絶縁処理として例えばワニス
を絶縁物に吹付け塗布後、乾燥して絶縁向上対策工事を
完了するものである。2. Description of the Related Art An electric motor (mill motor) for driving a steel rolling mill or the like is large in size, having a weight of 10 tons or more (output of 1000 KW or more). In such an electric motor, the deterioration of the insulating material progresses with the passage of time of operation of the rolling mill. Therefore, the timing of the insulation improving countermeasure work is determined by diagnosis, and the insulation improving countermeasure work is performed based on this determination. This construction is
First, the rotor of the electric motor is removed, and the rotor is divided into two parts. Steam is sprayed to remove oil stains, dust, brush powder, etc. of the insulating material, and then dried. Thereafter, as an insulating treatment, for example, a varnish is spray-applied to the insulating material and then dried to complete the insulating improvement countermeasure work.
【０００３】[0003]
【発明が解決しようとする課題】このような洗浄後の乾
燥に際しては、一般に整備現場で簡易組立式炉内に洗浄
後の電動機を装入し、常圧下で熱風を吹き込み加熱乾燥
するものであり、電動機の大きさによって若干異なる
が、４８時間以上を必要とする。また、絶縁処理として
ワニスを絶縁物に吹付け塗布後の乾燥においても同様
に、上記のごとく常圧下で加熱乾燥するものである。こ
のようなことから長時間の乾燥になり、整備工事が長時
間に及び圧延機の休止時間も長期にわたり、鋼材圧延の
生産性が低下することになる。また、乾燥時間が長くな
ると長時間加熱下に曝されることになり、整備した電動
機の絶縁物が熱劣化して絶縁回復度が低下し、延命効果
がそれ程向上せず、電動機の整備間隔が短周期になる。
従って、圧延機の稼働率を低下するとともに、整備コス
トも上昇させることになる等の課題がある。本発明は、
このような課題を有利に解決するためなされたものであ
り、洗浄後及び絶縁処理後の電動機乾燥に際し、迅速に
乾燥して上記のごとき課題を確実に解決することのでき
る乾燥炉及び乾燥方法を提供することを目的とするもの
である。In such drying after cleaning, generally, at the maintenance site, the electric motor after cleaning is loaded into a simple assembling furnace and hot air is blown under normal pressure to heat and dry. Depending on the size of the electric motor, it may take more than 48 hours. Further, as the insulating treatment, the varnish is sprayed and coated on the insulating material, and then dried after being heated and dried under the normal pressure as described above. As a result, the product will be dried for a long time, the maintenance work will take a long time, and the rolling mill will be down for a long time. Also, if the drying time becomes long, it will be exposed to heating for a long time, the insulation of the motor that has been maintained will deteriorate due to heat, and the degree of insulation recovery will decrease, and the life-prolonging effect will not improve so much. It becomes a short cycle.
Therefore, there is a problem that the operating rate of the rolling mill is reduced and the maintenance cost is increased. The present invention
In order to advantageously solve such a problem, in drying the motor after cleaning and after insulation treatment, a drying oven and a drying method capable of quickly drying to reliably solve the above problems are provided. It is intended to be provided.
【０００４】[0004]
【課題を解決するための手段】本発明の特徴とするとこ
ろは、真空乾燥炉内に整備電動機搬送台車の移動レール
を敷設し、該真空乾燥炉の整備電動機搬送台車搬入位置
下部及び側部にヒーターを配設するとともに、整備電動
機搬送台車搬入位置下部ヒーターの直下に送風管を配設
したことを特徴とする整備電動機の乾燥炉。及び洗浄ま
たは絶縁処理した電動機を真空蒸発温度まで加熱した
後、真空状態にして蒸発乾燥することを特徴とする整備
電動機の乾燥方法である。A feature of the present invention resides in that a moving rail for a maintenance electric motor carrier is laid in a vacuum drying furnace, and a lower portion and a side portion of the maintenance electric motor carrier carrying-in position of the vacuum drying furnace are provided. A drying oven for a maintenance electric motor, characterized in that a heater is provided and a blower pipe is provided directly below the heater at the lower position of the maintenance electric vehicle carrying carriage. And a method of drying a maintenance electric motor, which comprises heating the cleaned or insulated electric motor to a vacuum evaporation temperature and then evaporating and drying it in a vacuum state.
【０００５】[0005]
【発明の実施の形態】上記のごときヒーターとしては、
例えば電気、蒸気等によりヒーターパネルを加熱し、送
風管からの送風（空気等）接触により熱風として台車上
の電動機に接触せしめて加熱する。この加熱温度は、真
空蒸発温度に加熱するものであり、例えば電動機の表面
温度が４０〜６０℃になったとき、真空度約５ｔｒに炉
内を真空にして沸点を下げることによって、洗浄に付着
している水分を迅速かつ確実に蒸発乾燥することがで
き、真空度をより低下すれば、電動機の表面温度を低温
で蒸発乾燥することができる。また洗浄後、絶縁処理と
して例えば絶縁物に塗布したワニスを乾燥する場合も同
様に乾燥することにより、迅速に乾燥することができ、
乾燥後電動機温度が約６０℃になったときヒーターでの
送風加熱を停止して常温送風に切替えて送風冷却するこ
とにより一層迅速に冷却することができる。このような
炉内への送風加熱においては、炉内での熱風流を対流さ
せることにより、電動機の上下位置での温度差を５℃以
内にでき、電動機絶縁物の熱劣化を防止して品質低下を
確実に防止しつつ乾燥することができる。BEST MODE FOR CARRYING OUT THE INVENTION As the above heater,
For example, the heater panel is heated by electricity, steam or the like, and is brought into contact with the electric motor on the carriage as heated air by contact with air blown from the air blower pipe (air or the like) to heat it. This heating temperature is for heating to a vacuum evaporation temperature. For example, when the surface temperature of the electric motor reaches 40 to 60 ° C., the inside of the furnace is evacuated to a vacuum degree of about 5 tr to lower the boiling point to adhere to the cleaning. The water content can be evaporated and dried quickly and reliably, and if the degree of vacuum is further lowered, the surface temperature of the electric motor can be evaporated and dried at a low temperature. In addition, after washing, for example, when the varnish applied to the insulating material is dried as an insulating treatment, it can be dried quickly by similarly drying.
After the drying, when the temperature of the electric motor reaches about 60 ° C., the heating by the heater is stopped, the temperature is changed to the room temperature, and the air is cooled by the air flow, so that the cooling can be performed more quickly. In such blast heating into the furnace, the temperature difference between the upper and lower positions of the electric motor can be kept within 5 ° C by convection of the hot air flow in the furnace, preventing thermal deterioration of the electric motor insulation and improving the quality. It is possible to dry while surely preventing the deterioration.
【０００６】上記のごとく、絶縁処理後の乾燥に際して
は、加熱によりワニスの一部が溶融滴下するので台車直
下に溶融滴下液受パンを設け炉内への飛散を防止するこ
とが好ましく、例えば複数層に炉内幅方向で千鳥状に設
けることによって、対流送風を妨げることなく、しかも
確実に滴下液を受けることができる。As described above, when drying after the insulation treatment, a part of the varnish melts and drip due to heating, so it is preferable to provide a molten drip liquid receiving pan just below the carriage to prevent scattering into the furnace. By providing the layers in a zigzag shape in the width direction of the furnace, it is possible to reliably receive the dripping liquid without hindering convective air flow.
【０００７】[0007]
実施例１ 次に、本発明乾燥炉の実施例を挙げる。図１及び図２に
おいて、真空乾燥炉１内に外部から連通するレール２を
敷設し、このレール２上を乾燥すべき洗浄後または絶縁
処理後の電動機３を積載した整備電動機搬送台車４を外
部から炉１内へ移動位置し、次いで整備電動機搬送台車
４の搬入位置下部に配設した送風管５から常温空気を炉
１内へ送風し、整備電動機搬送台車４の搬入位置下部及
び側部に配設したヒーター６、６ａ、６ｂで加熱して熱
風として整備電動機搬送台車４上の電動機３に接触加熱
せしめ、炉１内を対流して上部の排気弁７から放散す
る。このようにして電動機３を加熱し、真空蒸発温度に
した後エゼクター（図示せず）を作動して炉１内を真空
にして沸点を下げ、洗浄後の水分または絶縁処理後のワ
ニスの溶剤を蒸発除去するものである。図中８は溶融滴
下液受パンである。Example 1 Next, an example of the drying oven of the present invention will be described. In FIG. 1 and FIG. 2, a rail 2 communicating with the outside from the outside is laid in a vacuum drying furnace 1, and a maintenance electric motor carrier 4 carrying a cleaned or insulated electric motor 3 to be dried on the rail 2 is externally mounted. To the inside of the furnace 1, and then blows room temperature air into the furnace 1 from the blower pipe 5 arranged below the carry-in position of the maintenance electric motor carrier 4 to the lower side and the side of the carry-in position of the maintenance electric motor carrier 4. It is heated by the heaters 6, 6a, 6b provided and heated as contact with the electric motor 3 on the maintenance electric motor carrier 4 to convect the inside of the furnace 1 and diffuse from the upper exhaust valve 7. In this way, the electric motor 3 is heated to a vacuum evaporation temperature, and then an ejector (not shown) is operated to evacuate the furnace 1 to lower the boiling point, thereby removing water after cleaning or solvent of varnish after insulation treatment. It is to be removed by evaporation. In the figure, numeral 8 is a molten dropping liquid receiving pan.
【０００８】次に、真空乾燥炉前後の蓋掛け機構を説明
する。図３において、蓋１０を保持枠１１を介して移動
台車（電動台車）１２に配設し、この移動台車１２をレ
ール台車１３に連結機構を介して連結する。この連結機
構は、緩衝吸収機能を有するバネ１４と伸縮機能を具備
するスプライン１５からなり、蓋１０で真空乾燥炉１前
後の整備電動機搬送台車出入口を閉めるときは、移動台
車１２を位置決めストッパー１６でレール台車１３が停
止する位置まで移動させることにより、真空乾燥炉１の
蓋１０掛け位置へ達し蓋掛けする。また、整備電動機搬
送台車の搬入搬出するため、真空乾燥炉１前後の整備電
動機搬送台車出入口の蓋を開ける場合は、移動台車１２
を位置決めストッパー１６の位置まで移動させることに
より、スプライン１５は収縮して蓋１０を真空乾燥炉１
の位置から移動させる。整備電動機搬送台車の真空乾燥
炉１内外への移動は、位置決めストッパー１６を外し移
動台車１２を移動してレール台車１３のレール２ａを真
空乾燥炉１内に敷設したレールに接続位置させて整備電
動機搬送台車を移動させる。このようにして真空乾燥炉
１の蓋１０等においては、上記のごとく移動台車１２と
レール台車１３の連結が、伸縮機能（スプライン１５）
を具備する連結機構により、真空乾燥炉１の直角方向に
おいて、狭いスペースで蓋の開閉が可能になり、作業現
場のレーアウトがコンパクトにでき極めて有効である。Next, the lid hanging mechanism before and after the vacuum drying furnace will be described. In FIG. 3, a lid 10 is arranged on a moving carriage (electric carriage) 12 via a holding frame 11, and this moving carriage 12 is connected to a rail carriage 13 via a connecting mechanism. This connecting mechanism is composed of a spring 14 having a cushioning absorption function and a spline 15 having an expansion and contraction function. When the lid 10 closes the maintenance electric motor carrier carriage entrance before and after the vacuum drying furnace 1, the movable carriage 12 is positioned by the positioning stopper 16. By moving the rail carriage 13 to a position where it stops, it reaches the lid 10 hooking position of the vacuum drying furnace 1 and hooks it. Further, in order to carry in and carry out the maintenance electric motor transport carriage, when the lid of the maintenance electric motor transport carriage entrance before and after the vacuum drying furnace 1 is opened, the moving carriage 12 is used.
Is moved to the position of the positioning stopper 16, the spline 15 contracts and the lid 10 is moved to the vacuum drying furnace 1.
Move from the position. To move the maintenance electric motor carrier into and out of the vacuum drying furnace 1, the positioning stopper 16 is removed, the moving carriage 12 is moved, and the rail 2a of the rail carriage 13 is connected to the rail laid in the vacuum drying furnace 1 to move the maintenance electric motor. Move the carrier. As described above, in the lid 10 of the vacuum drying furnace 1 and the like, the connection between the moving carriage 12 and the rail carriage 13 has the expansion / contraction function (spline 15).
With the connecting mechanism including, the lid can be opened and closed in a narrow space in the direction perpendicular to the vacuum drying furnace 1, and the layout at the work site can be made compact, which is extremely effective.
【０００９】実施例２ 次に、本発明乾燥方法の実施例を比較例とともに挙げ
る。電動機重量３０ｔ（回転子除去）を真空乾燥炉（長
さ５ｍ、直径５ｍ）内へ位置せしめ、次いで常温空気を
炉底から上向きに１５Ｎｍ3 ／分送風し、炉内のヒータ
ーにより熱風（１１０℃）にして対流させ、２．５時間
後電動機表面温度が５８℃になったところで、炉内を５
ｔｒの真空に保持して１．０時間経過後、乾燥を停止し
た。このとき電動機上下位置の表面温度差は、３℃とほ
ぼ均一に加熱乾燥することができた。Example 2 Next, an example of the drying method of the present invention will be given together with a comparative example. An electric motor weight of 30 t (rotor removed) was placed in a vacuum drying furnace (length 5 m, diameter 5 m), and then room temperature air was blown upward from the furnace bottom by 15 Nm 3 / min, and heated by a heater in the furnace (110 ° C.). ), And after 2.5 hours, when the surface temperature of the motor reached 58 ° C, the inside of the furnace was heated to 5 ° C.
The vacuum was maintained for 1 hour and the drying was stopped after 1.0 hour. At this time, the surface temperature difference between the upper and lower positions of the electric motor was 3 ° C., and heating and drying could be performed almost uniformly.
【００１０】このように洗浄後の乾燥冷却した電動機の
絶縁物に一般に用いられている液状ワニスを吹付け塗布
する絶縁処理した後、上記のごとき真空乾燥炉へ装入し
て１５Ｎｍ3 ／分送風し、炉内ヒーターにより熱風（１
１０℃）にして電動機へ接触して対流せしめ４．０時間
後、電動機表面温度が１００℃になったところで、炉内
を５ｔｒの真空に保持して３．０時間経過後、乾燥を停
止した。このとき電動機上下位置の表面温度差は、３℃
とほぼ均一に加熱乾燥することができた。また、絶縁抵
抗を測定したところ１０００ＭΩ以上と電動機絶縁物の
熱劣化も全く認められなかった。After the insulating treatment of spraying a liquid varnish generally used on the thus-dried and cooled electric insulator of the motor after washing, it is charged into the vacuum drying furnace as described above and blown with 15 Nm 3 / min. Hot air (1
(10 ° C.) and contact with the electric motor for convection 4.0 hours later, when the surface temperature of the electric motor reached 100 ° C., the inside of the furnace was kept under a vacuum of 5 tr for 3.0 hours, and then the drying was stopped. . At this time, the surface temperature difference between the vertical position of the motor is 3 ° C.
It was possible to heat and dry almost uniformly. Further, the insulation resistance was measured and found to be 1000 MΩ or more, and no thermal deterioration of the motor insulation was observed.
【００１１】比較例 常圧乾燥炉へ実施例２と同様な電動機を装入して、炉内
を１１０℃に加熱（無流動加熱）し８．０時間後、電動
機表面温度が９０℃に達し、更に７２時間後同温度で加
熱して乾燥を終え、このときの電動機上下位置の温度差
は２０℃達した。このように乾燥冷却した電動機の絶縁
物にワニスを吹付け塗布する絶縁処理した後、乾燥炉へ
装入して常圧下で炉内を１１０℃に加熱して３６時間経
過後、乾燥を停止した。このとき電動機上下位置の表面
温度差は、２０℃に達した。また、絶縁抵抗を測定した
ところ２００ＭΩと絶縁回復が低く、ワニスの硬化むら
も認められた。Comparative Example A motor similar to that used in Example 2 was charged into an atmospheric drying furnace, and the inside of the furnace was heated to 110 ° C. (no-flow heating), and after 8.0 hours, the surface temperature of the motor reached 90 ° C. After 72 hours, heating was continued at the same temperature to complete the drying, and the temperature difference between the upper and lower positions of the electric motor at this time reached 20 ° C. After the insulation treatment of spraying and coating the varnish on the insulating material of the electric motor which has been dried and cooled in this way, it is charged into a drying furnace and the inside of the furnace is heated to 110 ° C. under normal pressure, and after 36 hours, the drying is stopped. . At this time, the surface temperature difference between the upper and lower positions of the electric motor reached 20 ° C. Further, the insulation resistance was measured and the insulation recovery was low at 200 MΩ, and uneven curing of the varnish was also observed.
【００１２】[0012]
【発明の効果】本発明によれば、電動機の洗浄または絶
縁処理後の乾燥が迅速にでき、圧延器等の停止期間を短
縮して稼働率を向上し、生産性を高めることができる。
また、乾燥時間を著しく短縮できるので、電動機絶縁物
の熱劣化を防止することができ、電動機の機能低下を回
避しつつ、電動機の整備を施すことができる等の優れた
効果が得られる。According to the present invention, the electric motor can be quickly washed or dried after the insulation treatment, and the downtime of the rolling mill or the like can be shortened to improve the operating rate and enhance the productivity.
Further, since the drying time can be remarkably shortened, heat deterioration of the electric motor insulator can be prevented, and an excellent effect such as maintenance of the electric motor can be obtained while avoiding deterioration of the function of the electric motor.
【図１】本発明の実施例を示す正面図である。FIG. 1 is a front view showing an embodiment of the present invention.
【図２】本発明の実施例を示す要部側面図である。FIG. 2 is a side view of an essential part showing an embodiment of the present invention.
【図３】乾燥炉の蓋開閉機構を示す側面図である。FIG. 3 is a side view showing a lid opening / closing mechanism of the drying oven.
１ 真空乾燥炉 ２ 整備電動機搬送台車搬入レール ４ 整備電動機搬送台車 ５ 送風管 ６ ヒーター ６ａ ヒーター ６ｂ ヒーター ８ 溶融滴下液受パン 1 Vacuum Drying Furnace 2 Maintenance Motor Carrying Carry-in Rail 4 Maintenance Motor Carrying Car 5 Blower Pipe 6 Heater 6a Heater 6b Heater 8 Molten Dropping Liquid Receiving Pan
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浅田 林造 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 (72)発明者 佐野 哲夫 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Rinzo Asada 5-3 Tokai-cho, Tokai-shi, Aichi Pref.Nippon Steel Corporation (72) Inventor Tetsuo Sano 5-Tokai-cho, Tokai-shi, Aichi 3 Inside Nippon Steel Works, Nippon Steel Co., Ltd.
Claims (3)
動レールを敷設し、該真空乾燥炉の整備電動機搬送台車
搬入位置下部及び側部にヒーターを配設するとともに、
整備電動機搬送台車搬入位置下部ヒーターの直下に送風
管を配設したことを特徴とする整備電動機の乾燥炉。1. A moving rail for a maintenance electric motor carrier is laid in the vacuum drying furnace, and heaters are arranged at the lower and side portions of the maintenance electric motor carrier carrying-in position of the vacuum drying furnace.
Drying furnace for maintenance electric motor, characterized in that a blower pipe is arranged directly below the heater at the loading position of the maintenance electric motor carrier.
発温度まで加熱した後、真空状態にして蒸発乾燥するこ
とを特徴とする整備電動機の乾燥方法。2. A method of drying a maintenance electric motor, which comprises heating a cleaned or insulated electric motor to a vacuum evaporation temperature and then evaporating and drying it in a vacuum state.
パンを設けたことを特徴とする請求項１に記載の整備電
動機の乾燥炉。3. A drying furnace for a maintenance electric motor according to claim 1, wherein a molten dropping liquid receiving pan is provided immediately below the maintenance electric motor carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13685096A JP3694361B2 (en) | 1996-05-30 | 1996-05-30 | Maintenance electric motor drying furnace and drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13685096A JP3694361B2 (en) | 1996-05-30 | 1996-05-30 | Maintenance electric motor drying furnace and drying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09322496A true JPH09322496A (en) | 1997-12-12 |
| JP3694361B2 JP3694361B2 (en) | 2005-09-14 |
Family
ID=15184971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13685096A Expired - Fee Related JP3694361B2 (en) | 1996-05-30 | 1996-05-30 | Maintenance electric motor drying furnace and drying method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3694361B2 (en) |
-
1996
- 1996-05-30 JP JP13685096A patent/JP3694361B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3694361B2 (en) | 2005-09-14 |
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