JPS62258105A - Shaft earthing device of rotary machine - Google Patents
Shaft earthing device of rotary machineInfo
- Publication number
- JPS62258105A JPS62258105A JP61101005A JP10100586A JPS62258105A JP S62258105 A JPS62258105 A JP S62258105A JP 61101005 A JP61101005 A JP 61101005A JP 10100586 A JP10100586 A JP 10100586A JP S62258105 A JPS62258105 A JP S62258105A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- grounding
- pieces
- contact
- piece
- 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.)
- Pending
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000428 dust Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 5
- 239000010949 copper Substances 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000009940 knitting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002266 amputation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は１例えば、タービン発電機のような回転機械の
軸接地装置に関する。DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a shaft grounding device for a rotating machine such as, for example, a turbine generator.
（従来の技術）
例えば、タービン発電機では、電気的または機械的要因
により軸電圧が発生することがあり、その軸電圧の値が
過大になると、軸に直接または間接に駆動される制御装
置や、軸を支承する軸受に軸電流を誘起し、その部分に
電蝕を生じさせることがある。(Prior art) For example, in a turbine generator, shaft voltage may be generated due to electrical or mechanical factors, and if the value of the shaft voltage becomes excessive, the control device or the , a shaft current may be induced in the bearing that supports the shaft, causing electrolytic corrosion in that part.
左
しかして、上記タービン発電機に接地装置に付設し、大
地に接続した接触子（ブラシ）を軸に摺接して、軸の電
位を大地と等電位にすることで軸電圧の発生を防止して
いる。However, the generation of shaft voltage can be prevented by attaching a grounding device to the turbine generator and sliding a contact (brush) connected to the earth on the shaft to make the shaft potential equal to the earth. ing.
ところが、タービン発電機を代表とする高速回転機械に
おける軸接地装置は、高周速下で摺動しなければならな
いために、接地抵抗を小さくし、かつ、摩擦による減耗
を最小にするという相反した要求を満たさなくてはなら
ず、接地装置の型式と使用する材料の選択には、極めて
難かしいものがある。However, since shaft grounding devices in high-speed rotating machines, such as turbine generators, must slide at high circumferential speeds, it is difficult to minimize grounding resistance and wear due to friction. The selection of the type of earthing device and the materials used can be extremely difficult because of the requirements that must be met.
このような条件を満足する接地装置としては、特開昭５
７−１３５６５２に提案されている銅編線接地片を使用
した型式のものがあり、現在も実用に供されている。As a grounding device that satisfies these conditions, the Japanese Patent Laid-open No. 5
There is a type using a copper braided wire grounding piece proposed in No. 7-135652, and it is still in practical use.
に基づく接地装置の代表的構成例を説明する。A typical configuration example of a grounding device based on the following will be explained.
符号１は軸接地装置のブラケットであって、このブラケ
ット１は１回転軸２を支承する軸受３を４リツ
保持している回転機械の静止部４の断面にボルト５ａ、
５ｂを介して固定されている。上記ブラケットｌは、
断面路り字型を成しており、その−辺に接地片１０が取
付板６を介して挟着されている。Reference numeral 1 denotes a bracket for a shaft grounding device, and this bracket 1 has bolts 5a,
5b. The above bracket l is
It has a cross-sectional shape, and a grounding piece 10 is sandwiched on the negative side thereof with a mounting plate 6 interposed therebetween.
上記接地片１０は、銅素線を撚り合わせてなる銅ストラ
ンドを通常の編機を用いて袋編みして形成されるもので
あって、全体として細長い片となっている。そして、上
記接地片１０は一端をブラケット１に取付け、他端を軸
２に垂下させ、端部１０′を軸２に接触させている。し
かして、このような軸接地装置をタービン発電機に設置
した場合には、接地片１０の有する柔軟性により、軸２
にある面積で接触し、加圧装置、例えば板ばね７により
加圧力Ｆを加え、その接触面圧を一定に保持できるので
前記要求を満たす設計が可能となる。The grounding piece 10 is formed by bag-knitting a copper strand formed by twisting copper wires together using a normal knitting machine, and is an elongated piece as a whole. One end of the grounding piece 10 is attached to the bracket 1, the other end is suspended from the shaft 2, and the end 10' is brought into contact with the shaft 2. However, when such a shaft grounding device is installed in a turbine generator, the flexibility of the grounding piece 10 allows the shaft 2
Since the contact surface pressure can be kept constant by applying a pressing force F using a pressing device such as the leaf spring 7, a design that satisfies the above-mentioned requirements is possible.
（発明が解決しようとする問題点）
上記従来技術に基づく軸接地装置の欠点は、次の２点に
集約される。(Problems to be Solved by the Invention) The drawbacks of the shaft grounding device based on the above-mentioned prior art can be summarized into the following two points.
ひとつは、タービン発電機の置かれる環境に起因するも
のであるが、比較的塵埃の多い雰囲気中で使用されるた
めに、長時間の運用下においては、軸接地装置、特に接
地片１０と軸２との間に回転方向に伴う空気流に乗った
塵埃が堆積し易いことである。その結果、接地片１０と
軸２との間の接地面積が減することになり、接地抵抗を
増し、接地効果を不安定にしたり、損なったりすること
になる。One is due to the environment in which the turbine generator is placed. Since it is used in a relatively dusty atmosphere, the shaft grounding device, especially the grounding piece 10 and shaft The problem is that dust carried by the air flow in the direction of rotation is likely to accumulate between the two. As a result, the grounding area between the grounding piece 10 and the shaft 2 is reduced, increasing the grounding resistance and making the grounding effect unstable or impaired.
もうひとつは、軸接地装置の構造に起因するものであり
、第４図における加圧装置７の調整が不充分であると長
時間の運用の後には、加圧装置の加圧点７ａでの損耗が
異常進行し、ついには切断に至ることがあるのである。The other problem is due to the structure of the shaft grounding device, and if the adjustment of the pressurizing device 7 in Fig. 4 is insufficient, after a long period of operation, the pressurizing point 7a of the pressurizing device may become unstable. The wear and tear progresses abnormally and may eventually lead to amputation.
このような場合、板ばね７が軸２に直接接触することに
なるので、火花を発生し、水素冷却方式の発電機が使用
されている場合には極めて危険なことになる。In such a case, the leaf spring 7 will come into direct contact with the shaft 2, which will generate sparks, which is extremely dangerous if a hydrogen-cooled generator is used.
本発明は、従来技術に内在する上記のような長期運用に
対する欠点を解消し、より信頼性の高い軸接地装置を提
供することを目的としている。The present invention aims to eliminate the above-mentioned shortcomings inherent in the prior art regarding long-term operation, and to provide a more reliable shaft grounding device.
（問題点を解決するための手段）
本発明は、ブラケットに銅線を編成してなる接地片の一
端側を固着すると共に他端側を回転機械の軸に接触させ
るようなした軸接地装置において、接地片の軸に接触す
る側の先端を少なくともエバに分離するようなし、これ
らの接地片を回転方向の前後に押し拡げて軸に接触させ
てなる回転機械の軸接地装置である。(Means for Solving the Problems) The present invention provides a shaft grounding device in which one end of a grounding piece made of knitted copper wire is fixed to a bracket, and the other end is brought into contact with the shaft of a rotating machine. This is a shaft grounding device for a rotating machine, in which the tips of the grounding pieces on the side that contact the shaft are separated into at least an evaporator, and these grounding pieces are pushed forward and backward in the direction of rotation and brought into contact with the shaft.
（作 用）
上記の構成によれば、接地片は回転軸を挟むように回転
方向の前側と後側に配されて軸に接触するから、前側に
位置する接地片が塵埃を除去すると共に、軸との接触は
前側と後側の双方の接地片により確保されるから、従来
のように接地片を背後から加圧する必要がなくなる。し
たがって、軸と接地片の接触は塵埃の巻込みがなく極め
て安定したものとなり、また接地片の一端が片当りして
摩耗する不都合も解消される。(Function) According to the above configuration, the grounding pieces are disposed on the front and rear sides in the rotational direction so as to sandwich the rotating shaft and contact the shaft, so that the grounding pieces located on the front side remove dust and Since contact with the shaft is ensured by both the front and rear grounding pieces, there is no need to pressurize the grounding pieces from behind as in the conventional case. Therefore, the contact between the shaft and the grounding piece is extremely stable without entrainment of dust, and the problem of wear due to one end of the grounding piece being unevenly abutted is also eliminated.
（実 施 例）
第１図は本発明の一実施例を示すもので、回転軸２０の
外周の静止部にブラケット２１がボルト２２を締付けて
取着され、このブラケット２１に銅線を編成して板状に
形成された二枚の接地片２３．２４がボルト２５により
固定されている。接地片２３．２４は軸２０に接地する
側の先端が軸の回転方向の前側と後側へ互いに反対側に
屈曲して離間するよう束ねられており、 ＠２０はこれ
ら接地片２３．２４を押し拡げるよう、接地片２３．２
４に接触に十分な圧力を与えている。(Embodiment) Fig. 1 shows an embodiment of the present invention, in which a bracket 21 is attached to a stationary part on the outer periphery of a rotating shaft 20 by tightening bolts 22, and a copper wire is knitted to this bracket 21. Two plate-shaped ground pieces 23 and 24 are fixed with bolts 25. The grounding pieces 23 and 24 are bundled so that the ends of the grounding sides that contact the shaft 20 are bent in opposite directions to the front and rear sides of the shaft in the rotational direction of the shaft, and are separated from each other. Grounding piece 23.2 to spread it out.
4, applying sufficient pressure to contact.
上記の構成において、軸２０が矢符の方向へ回転すると
、軸２０の接地は主として接地片２３により行われ、回
転方向の前側に位置する接地片２４は軸２０との接触を
保ちつつ塵埃を除去する機能を有する。In the above configuration, when the shaft 20 rotates in the direction of the arrow, the shaft 20 is grounded mainly by the grounding piece 23, and the grounding piece 24 located on the front side in the rotational direction keeps contact with the shaft 20 and removes dust. It has the function of removing.
すなわち、空気中に混在した塵埃が軸２０の表面に付着
しても回転方向前側に位置する接地片２４により除去さ
れ、後側の接地片２３は常に塵埃を介在させない状態で
軸２０との接触を保持できることとなる。接地片２４は
その先端が回転力１キ狂逆向きになるよう取着されてい
るから、この塵埃除去の作用はなお著しい。That is, even if dust mixed in the air adheres to the surface of the shaft 20, it is removed by the grounding piece 24 located on the front side in the rotational direction, and the rear grounding piece 23 is always in contact with the shaft 20 without intervening dust. This means that it is possible to maintain Since the grounding piece 24 is attached so that its tip is oriented in the opposite direction of the rotational force, this dust removal effect is even more remarkable.
また、接地片２４は通常接地片２３と同様に導電性に優
れた材料で構成されるから、軸２０との接触は接触片２
３．２４の双方によって行われ十分な接触を確保できる
こととなり、従来のような接地片を背後から加圧する必
要がなく、このため接地片の片当り等の不都合を生じる
ことがない。Further, since the grounding piece 24 is usually made of a material with excellent conductivity like the grounding piece 23, the contact with the shaft 20 is made by the contact piece 24.
3.24, sufficient contact can be ensured, and there is no need to pressurize the grounding piece from behind as in the conventional case, thereby eliminating problems such as uneven contact of the grounding piece.
なお、上記例では接地片を二枚束ねたものを示したが、
これに限らず、軸に接する側がエバに分離されるような
ものであれば一体的に形成されていても差し支えない。In addition, although the above example shows a bundle of two grounding pieces,
The present invention is not limited to this, and it may be integrally formed as long as the side in contact with the shaft is separated into evaporators.
第２図は他の実施例を示すもので、第１図に示した接地
片２３．２４の間に、その先端をわずかに広げる程度に
軸２０に押付けて板状の第三の接地片２６が介挿されて
いる。かかる構成によれば、接地片２６はその先端でそ
れを構成する銅素線のそれぞれが軸２０と接触すること
になるため、側面を接触するようにした接地片２３．２
４と併せて優れた接触効果を得ることができる。また、
接地片２６を介在させる結果、接地片２３．２４の間に
軸方向から塵埃が侵入するのが防止されると共に、接地
片２４に加えて接地片２６が塵埃除去機能を果たし、本
実施例によれば塵埃による接触不良は著しく低減される
。FIG. 2 shows another embodiment, in which a plate-shaped third grounding piece 26 is inserted between the grounding pieces 23 and 24 shown in FIG. is inserted. According to this configuration, since each of the copper wires constituting the grounding piece 26 comes into contact with the shaft 20 at its tip, the grounding piece 23.2 whose side surfaces are in contact with each other comes into contact with the shaft 20.
4, an excellent contact effect can be obtained. Also,
As a result of interposing the grounding piece 26, dust is prevented from entering between the grounding pieces 23 and 24 from the axial direction, and the grounding piece 26 in addition to the grounding piece 24 performs a dust removal function. Accordingly, poor contact due to dust is significantly reduced.
以上述べたように、本発明は回転方向の前後に押し拡げ
るように軸に接触させた接触片を備えたものであるから
、本発明によれば接地片と軸の間に塵埃が堆積するのを
未然に防止でき５回転機械の透長期運用における接地効
果の安定性を確保することができる。また、接地片を軸
に押圧するための構成が不要となるから、接地片の片当
たり等による不都合もなくなる等１本発明は簡単な構成
で実用的に極めて優れたものである。As described above, since the present invention is provided with a contact piece that is brought into contact with the shaft so as to be spread forward and backward in the direction of rotation, the present invention prevents dust from accumulating between the grounding piece and the shaft. It is possible to prevent this from occurring and ensure the stability of the grounding effect during transparent period operation of a five-rotation machine. Further, since there is no need for a structure for pressing the grounding piece against the shaft, there is no problem caused by uneven contact of the grounding piece, etc. The present invention has a simple structure and is extremely excellent in practical use.
第１図は本発明の一実施例に係る回転機械の軸接地装置
の側面図、第２図は他の実施例を示す側面図、第３図お
よび第４図は従来の軸接地装置を示すもので、第３図は
正面図、第４図は側面図である。
２０・・・軸、 ２１・・・ブラケット、
２３、２４．２６・・・接地片
代理人 弁理士 則 近 憲 佑
同 三俣弘文
回重り方向
第１図
回ｉ：、８Ｉ７１
第２図
第３図
第４図Fig. 1 is a side view of a shaft grounding device for a rotating machine according to an embodiment of the present invention, Fig. 2 is a side view showing another embodiment, and Figs. 3 and 4 show conventional shaft grounding devices. Fig. 3 is a front view, and Fig. 4 is a side view. 20...shaft, 21...bracket,
23, 24. 26...Grounding Piece Agent Patent Attorney Rule Ken Chika Yudo Hirofumi Mitsumata Weight Direction Figure 1 I:, 8I71 Figure 2 Figure 3 Figure 4
Claims (3)
を固着すると共に他端側を回転機械の軸に接触させるよ
うなした軸接地装置において、接地片の軸に接触する側
の先端を少なくとも二片に分離するようになし、これら
の接地片を回転方向の前後に押し拡げて軸に接触させて
なる回転機械の軸接地装置。(1) In a shaft grounding device in which one end of a grounding piece made of braided copper wire is fixed to a bracket and the other end is brought into contact with the shaft of a rotating machine, the tip of the grounding piece on the side that contacts the shaft A shaft grounding device for a rotating machine, in which the grounding piece is separated into at least two pieces, and these grounding pieces are pushed forward and backward in the direction of rotation and brought into contact with the shaft.
らの接地片は軸に接触する側の先端が互いに離間するよ
う束ねてブラケットに固着されている特許請求の範囲第
１項記載の回転機械の軸接地装置。(2) The grounding piece is composed of a first grounding piece and a second grounding piece, and these grounding pieces are bundled and fixed to the bracket so that the ends of the grounding pieces that contact the shaft are separated from each other. shaft grounding device for rotating machinery.
地片より短かくその先端が軸に接する第三の接地片を介
在させた特許請求の範囲第２項記載の回転機械の軸接地
装置。(3) A rotating machine according to claim 2, wherein a third grounding piece, which is shorter than these grounding pieces and whose tip touches the shaft, is interposed between the first and second grounding pieces. Axial grounding device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61101005A JPS62258105A (en) | 1986-05-02 | 1986-05-02 | Shaft earthing device of rotary machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61101005A JPS62258105A (en) | 1986-05-02 | 1986-05-02 | Shaft earthing device of rotary machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62258105A true JPS62258105A (en) | 1987-11-10 |
Family
ID=14289137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61101005A Pending JPS62258105A (en) | 1986-05-02 | 1986-05-02 | Shaft earthing device of rotary machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62258105A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7436091B2 (en) * | 2005-06-29 | 2008-10-14 | Detroit Diesel Corporation | Method and system of limiting arcing of rotating member |
| DE102014115291A1 (en) * | 2014-10-21 | 2016-05-12 | Ebm-Papst Mulfingen Gmbh & Co. Kg | grounding device |
| JP2018014882A (en) * | 2016-07-21 | 2018-01-25 | シーメンス エナジー インコーポレイテッド | Shaft grounding system |
| JP2019509007A (en) * | 2016-03-03 | 2019-03-28 | カコ ゲーエムベーハー ウント コンパニー カーゲー | Shaft grounding ring |
-
1986
- 1986-05-02 JP JP61101005A patent/JPS62258105A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7436091B2 (en) * | 2005-06-29 | 2008-10-14 | Detroit Diesel Corporation | Method and system of limiting arcing of rotating member |
| DE102014115291A1 (en) * | 2014-10-21 | 2016-05-12 | Ebm-Papst Mulfingen Gmbh & Co. Kg | grounding device |
| US10069382B2 (en) | 2014-10-21 | 2018-09-04 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Earthing device |
| JP2019509007A (en) * | 2016-03-03 | 2019-03-28 | カコ ゲーエムベーハー ウント コンパニー カーゲー | Shaft grounding ring |
| JP2018014882A (en) * | 2016-07-21 | 2018-01-25 | シーメンス エナジー インコーポレイテッド | Shaft grounding system |
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