JP2006112529A - Bolt heating device - Google Patents

Bolt heating device Download PDF

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Publication number
JP2006112529A
JP2006112529A JP2004300850A JP2004300850A JP2006112529A JP 2006112529 A JP2006112529 A JP 2006112529A JP 2004300850 A JP2004300850 A JP 2004300850A JP 2004300850 A JP2004300850 A JP 2004300850A JP 2006112529 A JP2006112529 A JP 2006112529A
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bolt
heating
heating part
heating device
outer shell
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JP4498879B2 (en
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Toru Horie
堀江　　徹
Nobutaka Enoki
伸孝 榎
Minoru Masuko
実 増子
Atsushi Kono
敦 河野
Yasuo Kurimoto
泰夫 栗本
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Hitachi Engineering and Services Co Ltd
Sukegawa Electric Co Ltd
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Hitachi Engineering and Services Co Ltd
Sukegawa Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt heating device with a heating part long enough to heat a bolt throughout its length in a short time. <P>SOLUTION: The bolt heating device 1 comprises the bolt heating part 12, a non-heating part 11 formed on the upper side thereof, and a terminal box 14 provided on the upper side of the non-heating part 11. The bolt heating part 12 and the non-heating part 11 are each formed with an outer shell having a cavity inside. The outer shell of the non-heating part 11 is formed of a flexible member which can be freely bent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は発電所における蒸気タービンのケーシングをボルト締結する際にボルトを加熱するボルト加熱装置に関する。   The present invention relates to a bolt heating device that heats a bolt when bolting a casing of a steam turbine in a power plant.

火力発電所や原子力発電所に設置されるタービン発電機の定期点検等においては、蒸気タービンのケーシングを再組立てしている。タービンが稼働される際のケーシング温度は数百℃、例えば２５０℃程度となる。このため、常温状態でボルトを締め付けても、ケーシングとボルトとの線膨張係数差によって高温時にボルトが伸び、ナットによる所定の締付けトルクを保持できなくなる。高温時にはケーシングも熱膨張で伸びるが、通常、ボルトの線膨張係数の方が大きいので緩みを生じる。   In periodic inspections of turbine generators installed at thermal power plants and nuclear power plants, the casing of the steam turbine is reassembled. The casing temperature when the turbine is operated is several hundred degrees Celsius, for example, about 250 degrees Celsius. For this reason, even if the bolt is tightened at room temperature, the bolt is stretched at a high temperature due to the difference in linear expansion coefficient between the casing and the bolt, and a predetermined tightening torque by the nut cannot be maintained. When the temperature is high, the casing also expands due to thermal expansion. However, since the linear expansion coefficient of the bolt is usually larger, loosening occurs.

このことを防止するために、常温状態でボルトを所定温度に加熱して所定トルクで締め付けた後に冷却するようにしている。ボルトは軸方向に穿設されている孔に加熱用の棒状加熱装置（ボルト加熱装置）を挿入され加熱される。ボルトは所定の伸び量になる温度まで加熱される。   In order to prevent this, the bolt is heated to a predetermined temperature in a normal temperature state and tightened with a predetermined torque, and then cooled. The bolt is heated by inserting a heating rod-shaped heating device (bolt heating device) into a hole drilled in the axial direction. The bolt is heated to a temperature that achieves a predetermined amount of elongation.

ボルト加熱装置はボルト加熱部の上側に非加熱部を形成し、非加熱部の上側に端子箱を
設けた構成にしている。加熱部は内部空洞の外殻にヒータ線を電気絶縁して配置して構成されている。また、非加熱部は加熱部が高温になり端子箱が焼損あるいは劣化するのを防止するために設けられる。非加熱部の外殻は熱伝導の悪い部材で構成される。このようなボルト加熱装置は、例えば下記の特許文献１に記載されている。 The bolt heating device has a configuration in which a non-heating part is formed above the bolt heating part and a terminal box is provided above the non-heating part. The heating unit is configured by disposing a heater wire electrically insulated from an outer shell of an internal cavity. The non-heating part is provided in order to prevent the heating part from becoming hot and causing the terminal box to burn out or deteriorate. The outer shell of the non-heating part is composed of a member having poor heat conduction. Such a bolt heating apparatus is described in, for example, Patent Document 1 below.

特開平９−１１９４１９号公報JP-A-9-119419

従来技術のボルト加熱装置は、加熱部と非加熱部の外殻を剛性の高い硬性部材で形成している。ところが、タービン発電機はタービンケーシングの上部に主蒸気管が配置されている。主蒸気管の下に位置するボルトを加熱するにはボルト加熱装置の挿入する高さが制限される。つまり、ボルト加熱装置の長さが制限されることになる。   In the bolt heating device of the prior art, the outer shell of the heating part and the non-heating part is formed of a rigid member having high rigidity. However, in the turbine generator, the main steam pipe is arranged at the upper part of the turbine casing. In order to heat the bolt located under the main steam pipe, the insertion height of the bolt heating device is limited. That is, the length of the bolt heating device is limited.

ボルトは直径が１５０ｍｍ、長さが１ｍ程度と大きく、ボルト加熱装置の加熱部の長さをボルトの全長に亘って加熱できる大きさにすることが困難である。このため、ボルト全体を所定温度（所定伸び量）にするのに多くの時間がかかり、ボルト締付けに長時間を要するという問題点を有する。   The bolt has a diameter as large as 150 mm and a length of about 1 m, and it is difficult to make the length of the heating part of the bolt heating device large enough to be heated over the entire length of the bolt. For this reason, it takes much time to bring the entire bolt to a predetermined temperature (predetermined amount of elongation), and there is a problem that it takes a long time to tighten the bolt.

特に、ケーシングのボルト締結作業は、電力需要の少ない時期や時間帯を選定し、予備のタービン発電機で需要を賄いながら行うようにしているので、作業時間を短縮することが強く要望されている。   In particular, since the bolt fastening operation of the casing is carried out while supplying the demand with a spare turbine generator by selecting a period and time period when the power demand is low, there is a strong demand for shortening the work time. .

本発明の目的は加熱部の長さをボルトの全長に亘って加熱できる大きさにすることができボルトを短時間で加熱できるボルト加熱装置を提供することにある。   An object of the present invention is to provide a bolt heating apparatus that can heat the bolt in a short time by making the length of the heating portion large enough to be heated over the entire length of the bolt.

本発明の特徴とするところはボルト加熱部の上側に形成される非加熱部を可撓性部材で構成したことにある。   The feature of the present invention resides in that the non-heating part formed on the upper side of the bolt heating part is composed of a flexible member.

具体的には、ボルト加熱部およびボルト加熱部の上側に形成される非加熱部を内部空洞の外殻で形成し、非加熱部の外殻を折曲自在な可撓性部材で構成する。   Specifically, the bolt heating part and the non-heating part formed on the upper side of the bolt heating part are formed by the outer shell of the internal cavity, and the outer shell of the non-heating part is configured by a flexible member that can be bent.

本発明はボルト加熱部の上側に形成される非加熱部を折曲自在な可撓性部材で構成しているので加熱部の長さをボルトの全長に亘って加熱できる大きさにすることができボルトを短時間で加熱できる。その結果として作業時間を短縮することができる。   In the present invention, since the non-heating part formed on the upper side of the bolt heating part is composed of a flexible member that can be bent, the length of the heating part can be made large enough to be heated over the entire length of the bolt. The bolt can be heated in a short time. As a result, the working time can be shortened.

ボルト加熱装置はボルト加熱部の上側に非加熱部を形成し、非加熱部の上側に端子箱が設けられている。ボルト加熱部と非加熱部は内部空洞の外殻で形成され、非加熱部の外殻は折曲自在な可撓性部材で構成されている。   The bolt heating device forms a non-heating part above the bolt heating part, and a terminal box is provided above the non-heating part. The bolt heating part and the non-heating part are formed by an outer shell of an internal cavity, and the outer shell of the non-heating part is constituted by a flexible member that can be bent.

図１に本発明の一実施例を示す。   FIG. 1 shows an embodiment of the present invention.

図１において、ボルト加熱装置１は加熱部１２の上側に非加熱部１１が形成されている。加熱部１２と非加熱部１１は内部空洞の外殻で形成されている。加熱部１２の外殻はステンレスで構成され、また、非加熱部１１の外殻は熱伝導の悪い部材で構成されている。加熱部１２の内部にはヒータ線（図示せず）が絶縁して配置されている。   In FIG. 1, the bolt heating device 1 has a non-heating part 11 formed above the heating part 12. The heating part 12 and the non-heating part 11 are formed by an outer shell of an internal cavity. The outer shell of the heating part 12 is made of stainless steel, and the outer shell of the non-heating part 11 is made of a member having poor heat conduction. A heater wire (not shown) is insulated from the heating unit 12.

非加熱部１１の上側に電力ケーブル１５を接続した端子箱１４が設けられている。電力ケーブル１５から給電される電力は非加熱部１１の外殻内部を挿通する給電線を介してヒータ線に加えられる。   A terminal box 14 to which a power cable 15 is connected is provided above the non-heating unit 11. Electric power fed from the power cable 15 is applied to the heater wire via a feed line that passes through the outer shell of the non-heating unit 11.

非加熱部１１は加熱部１２が高温になり端子箱１４が焼損あるいは劣化するのを防止するために設けられる。非加熱部１１の外殻は折曲自在な可撓性部材で構成されている。なお、加熱部１２の下側にはヒータ線の短絡を防止するために絶縁材（例えば、セラミック）を充填した微小な非加熱部１３が形成されている。   The non-heating unit 11 is provided in order to prevent the heating unit 12 from becoming hot and causing the terminal box 14 to burn out or deteriorate. The outer shell of the non-heating unit 11 is composed of a flexible member that can be bent. A small non-heating part 13 filled with an insulating material (for example, ceramic) is formed below the heating part 12 in order to prevent a short circuit of the heater wire.

このようなボルト加熱装置１によりボルトを加熱する状態について図２を参照して説明する。   A state in which the bolt is heated by the bolt heating apparatus 1 will be described with reference to FIG.

図２において、中心部に軸方向の孔７を穿設されているボルト２は上部ケーシングフランジ３の貫通孔８と下部ケーシングフランジ４の貫通孔９を貫通し、上側と下側を上側ナット５ａと下側ナット５ｂで締付けられている。この状態における上側ナット５ａ、下側ナット５ｂは仮締付けである。   In FIG. 2, a bolt 2 having an axial hole 7 formed in the center portion passes through a through hole 8 in the upper casing flange 3 and a through hole 9 in the lower casing flange 4, and the upper and lower nuts 5a are arranged on the upper side and the lower side. And the lower nut 5b. The upper nut 5a and the lower nut 5b in this state are temporarily tightened.

ボルト２の上には主蒸気管６が配置されている。主蒸気管６と上側ナット５ａの距離をＨ１とする。本発明のボルト加熱装置１は非加熱部１１を可撓性部材で構成しているので図示のように湾曲させることができる。したがって、ボルト加熱装置１の加熱部１２の長さをＨ２にしても貫通孔７、８に挿入することができる。   A main steam pipe 6 is disposed on the bolt 2. The distance between the main steam pipe 6 and the upper nut 5a is H1. The bolt heating device 1 of the present invention can be curved as shown in the figure because the non-heating part 11 is formed of a flexible member. Therefore, even if the length of the heating unit 12 of the bolt heating device 1 is H2, it can be inserted into the through holes 7 and 8.

図３に示すようにボルト加熱装置１をボルト２の孔７に挿入して端子箱１４から給電しボルト２を加熱する。ボルト２が所定温度（例えば２５０℃）に相当する時間通電した後に所定トルクでナット５ａ、５ｂを締付ける。ナット５ａ、５ｂの締付け作業が終了した後に冷却される。   As shown in FIG. 3, the bolt heating device 1 is inserted into the hole 7 of the bolt 2, and power is supplied from the terminal box 14 to heat the bolt 2. After the bolt 2 is energized for a time corresponding to a predetermined temperature (for example, 250 ° C.), the nuts 5a and 5b are tightened with a predetermined torque. Cooling is performed after the tightening operation of the nuts 5a and 5b is completed.

このようにしてボルト２を加熱するのであるが、非加熱部１１を可撓性部材で構成しているので加熱部１２の有効加熱長をＨ２にすることができる。したがって、加熱部１２の長さＨ２はボルト２の全長に亘って加熱できる大きさにすることができ、ボルト２を短時間で加熱できるようになる。   In this way, the bolt 2 is heated. Since the non-heating part 11 is made of a flexible member, the effective heating length of the heating part 12 can be set to H2. Therefore, the length H2 of the heating part 12 can be made large enough to heat the entire length of the bolt 2, and the bolt 2 can be heated in a short time.

一方、加熱部１２と非加熱部１１の外殻を剛性の高い硬性部材で形成している従来技術のボルト加熱装置は、図４に示すように非加熱部１１の長さが等しいとすると加熱部１２の長さがＨ３になる。図２と図4を比較して明らかなようにＨ２＞Ｈ３になる。   On the other hand, in the conventional bolt heating device in which the outer shells of the heating unit 12 and the non-heating unit 11 are formed of a rigid member having high rigidity, the length of the non-heating unit 11 is equal as shown in FIG. The length of the part 12 is H3. As apparent from a comparison between FIG. 2 and FIG. 4, H2> H3.

従来技術のボルト加熱装置１をボルト２の孔７に挿入した状態は図５に示すように加熱部１２がボルト２の全長の半分程度になり、下部ケーシングフランジ４に位置するボルト２の加熱長さは非常に短くなる。したがって、ボルト２全体が所定温度（所定伸び量）にするのに長時間要することになる。   The state in which the bolt heating device 1 according to the prior art is inserted into the hole 7 of the bolt 2 is such that the heating part 12 is about half the total length of the bolt 2 as shown in FIG. It becomes very short. Therefore, it takes a long time for the entire bolt 2 to reach the predetermined temperature (predetermined elongation).

図６に本発明と従来技術における加熱時間に対するボルト伸び量の特性図を示す。図６に示すように、規定伸び量に達する加熱時間が従来技術で約６０分要していたのを本発明では約２０分と１／３に大幅短縮することができる。なお、図６は６インチのボルトの例を示している   FIG. 6 is a characteristic diagram of bolt elongation with respect to heating time in the present invention and the prior art. As shown in FIG. 6, the heating time to reach the specified elongation amount of about 60 minutes in the prior art can be greatly reduced to about 20 minutes and 1/3 in the present invention. FIG. 6 shows an example of a 6-inch bolt.

本発明の一実施例を示す構成図である。It is a block diagram which shows one Example of this invention. 本発明のボルト加熱装置をボルト孔に挿入する状態を示す図である。It is a figure which shows the state which inserts the bolt heating apparatus of this invention in a bolt hole. 本発明のボルト加熱装置をボルト孔に挿入した状態を示す図である。It is a figure which shows the state which inserted the volt | bolt heating apparatus of this invention in the volt | bolt hole. 従来のボルト加熱装置をボルト孔に挿入する状態を示す図である。It is a figure which shows the state which inserts the conventional volt | bolt heating apparatus in a volt | bolt hole. 従来のボルト加熱装置をボルト孔に挿入した状態を示す図である。It is a figure which shows the state which inserted the conventional volt | bolt heating apparatus in the volt | bolt hole. 本発明と従来技術の加熱時間に対するボルト伸び量を示す特性図である。It is a characteristic view which shows the volt | bolt elongation amount with respect to the heating time of this invention and a prior art.

符号の説明Explanation of symbols

１…ボルト加熱装置、２…ボルト、３…上部ケーシング、４…下部ケーシング、５ａ…上側ナット、５ｂ…下側ナット、６…主蒸気管、７…ボルト孔、８…上部ケーシング孔、９…下部ケーシング孔、１１…非加熱部、１２…加熱部、１３…非加熱部、１４…端子箱、１５…ケーブル。
DESCRIPTION OF SYMBOLS 1 ... Bolt heating apparatus, 2 ... Bolt, 3 ... Upper casing, 4 ... Lower casing, 5a ... Upper nut, 5b ... Lower nut, 6 ... Main steam pipe, 7 ... Bolt hole, 8 ... Upper casing hole, 9 ... Lower casing hole, 11 ... non-heating part, 12 ... heating part, 13 ... non-heating part, 14 ... terminal box, 15 ... cable.

Claims (2)

ボルト加熱部の上側に非加熱部を形成し、前記非加熱部の上側に端子箱が設けられているボルト加熱装置において、前記非加熱部は可撓性部材で構成されていることを特徴とするボルト加熱装置。   In the bolt heating apparatus in which a non-heating part is formed on the upper side of the bolt heating part and a terminal box is provided on the upper side of the non-heating part, the non-heating part is made of a flexible member. Bolt heating device. ボルト加熱部および前記ボルト加熱部の上側に形成される非加熱部を内部空洞の外殻で形成し、前記非加熱部の上側に端子箱が設けられているボルト加熱装置において、前記非加熱部の外殻は折曲自在な可撓性部材で構成されていることを特徴とするボルト加熱装置。
In the bolt heating device in which the bolt heating unit and the non-heating unit formed on the upper side of the bolt heating unit are formed by an outer shell of an internal cavity, and a terminal box is provided on the upper side of the non-heating unit, the non-heating unit The outer shell is made of a flexible member that can be bent.
JP2004300850A 2004-10-15 2004-10-15 Bolt heating device Active JP4498879B2 (en)

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JP4498879B2 JP4498879B2 (en) 2010-07-07

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101451259B1 (en) * 2013-07-23 2014-10-16 대모 엔지니어링 주식회사 Assembling method of long-bolt for hydraulic breaker

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06203948A (en) * 1993-01-07 1994-07-22 Mitsubishi Heavy Ind Ltd High frequency bolt heater
JPH07114984A (en) * 1993-10-15 1995-05-02 Mitsubishi Heavy Ind Ltd Flexible heater coil
JPH0953622A (en) * 1995-08-17 1997-02-25 Mitsubishi Heavy Ind Ltd High frequency heating method of bolt with hole
JPH09119419A (en) * 1995-10-25 1997-05-06 Mitsubishi Heavy Ind Ltd Bolt heater
JPH09153392A (en) * 1995-11-29 1997-06-10 Dai Ichi High Frequency Co Ltd Insertion type induction heating coil
JPH10233280A (en) * 1996-12-16 1998-09-02 Mitsubishi Heavy Ind Ltd High frequency rod-shaped heater
JPH11273851A (en) * 1998-03-23 1999-10-08 Mitsubishi Heavy Ind Ltd High-frequency heating coil device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06203948A (en) * 1993-01-07 1994-07-22 Mitsubishi Heavy Ind Ltd High frequency bolt heater
JPH07114984A (en) * 1993-10-15 1995-05-02 Mitsubishi Heavy Ind Ltd Flexible heater coil
JPH0953622A (en) * 1995-08-17 1997-02-25 Mitsubishi Heavy Ind Ltd High frequency heating method of bolt with hole
JPH09119419A (en) * 1995-10-25 1997-05-06 Mitsubishi Heavy Ind Ltd Bolt heater
JPH09153392A (en) * 1995-11-29 1997-06-10 Dai Ichi High Frequency Co Ltd Insertion type induction heating coil
JPH10233280A (en) * 1996-12-16 1998-09-02 Mitsubishi Heavy Ind Ltd High frequency rod-shaped heater
JPH11273851A (en) * 1998-03-23 1999-10-08 Mitsubishi Heavy Ind Ltd High-frequency heating coil device

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