JP2015019487A - Shaft grounding device - Google Patents

Shaft grounding device Download PDF

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Publication number
JP2015019487A
JP2015019487A JP2013144538A JP2013144538A JP2015019487A JP 2015019487 A JP2015019487 A JP 2015019487A JP 2013144538 A JP2013144538 A JP 2013144538A JP 2013144538 A JP2013144538 A JP 2013144538A JP 2015019487 A JP2015019487 A JP 2015019487A
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shaft
grounding
bracket
brush
movable bracket
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JP6071784B2 (en
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幸平 小園
Kohei Kozono
幸平 小園
夏樹 石橋
Natsuki Ishibashi
夏樹 石橋
義尚 井
Yoshinao I
義尚 井
大橋　俊之
Toshiyuki Ohashi
俊之 大橋
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Toshiba Corp
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Toshiba Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a shaft grounding device allowing safely and efficiently performing maintenance inspection and exchange work of a grounding brush.SOLUTION: The shaft grounding device is structured so that at least one shaft grounding member 10a is fitted on the end of a bearing base 20 and so that a shaft voltage generated at a generator shaft 1 is grounded by the shaft grounding member 10a. The shaft grounding member 10a includes a fixed bracket 5 fixed at the end of the bearing base 20, a movable bracket 6 mounted on the fixed bracket 5 to be displaceable, and a grounding brush 3 mounted on the movable bracket 6. The grounding brush 3 moves from a contact position with the generator shaft 1 to a non-contact position by displacing the movable bracket 6.

Description

本発明は蒸気タービン又は発電機の軸系に発生する軸電圧をアースするための軸接地装置に関する。   The present invention relates to a shaft grounding device for grounding a shaft voltage generated in a shaft system of a steam turbine or a generator.

運転中の蒸気タービン又は発電機の軸系に軸電圧が発生することが知られている。その原因は磁気不平衡により発電機に生ずる電磁誘導電圧や、蒸気タービン側の湿り蒸気域での羽根および羽根車と蒸気との間の回転摩擦に起因する静電気電圧が代表的なものである。これらの軸電圧は機器の安全性確保のために有効にアース（接地）して、十分低い値に保つ必要がある。   It is known that a shaft voltage is generated in a shaft system of a steam turbine or a generator in operation. The cause is typically an electromagnetic induction voltage generated in the generator due to magnetic imbalance or an electrostatic voltage due to rotational friction between blades and impellers and steam in the wet steam region on the steam turbine side. These shaft voltages must be effectively grounded and kept at a sufficiently low value to ensure the safety of the equipment.

従来の軸接地装置を図６及び図７により説明する。この軸接地装置は軸受台２０の端部に設けられた油切り部２に取り付けられた少なくとも一つの軸接地部材１０からなり、この軸接地部材１０により発電機軸１で発生した軸電圧をアースする。   A conventional shaft grounding device will be described with reference to FIGS. This shaft grounding device comprises at least one shaft grounding member 10 attached to an oil draining portion 2 provided at the end of the bearing base 20, and grounds the shaft voltage generated at the generator shaft 1 by this shaft grounding member 10. .

軸接地部材１０は発電機軸１の回転中に発電機軸１に接触し軸電圧を集電する銅編みブラシ等からなる接地ブラシ３と、一端が油切り部２にボルト７等により取り付けられ他端が接地ブラシ３を保持する固定ブラケット５とから構成される。接地ブラシ３の背面には、接地ブラシ３を発電機軸１に確実に接触させるために板バネ４が設けられている。接地ブラシ３で集電した軸電圧は、固定ブラケット５、油切り部２、軸受台２０、軸受台２０に設けられたアース端子（図示せず）を通してアースされる。   The shaft grounding member 10 includes a grounding brush 3 made of a copper braided brush or the like that contacts the generator shaft 1 and collects a shaft voltage while the generator shaft 1 is rotating. Comprises a fixed bracket 5 for holding the grounding brush 3. A leaf spring 4 is provided on the back surface of the grounding brush 3 in order to ensure that the grounding brush 3 is in contact with the generator shaft 1. The shaft voltage collected by the grounding brush 3 is grounded through the fixed bracket 5, the oil draining portion 2, the bearing base 20, and a ground terminal (not shown) provided on the bearing base 20.

接地ブラシ３として銅編みブラシの他に、銀ブラシやカーボンブラシ等も使用可能であるが、これらはいずれも銅編みブラシよりも磨耗し易いため、保守性、信頼性が高く接地容量が大きい銅編みブラシが広く使用されている。   In addition to a copper braided brush, a silver brush, a carbon brush, etc. can be used as the ground brush 3. However, since these are more easily worn than a copper braided brush, they are copper that has high maintainability and reliability and a large grounding capacity. Knitting brushes are widely used.

特開２００９−７４９６０号公報JP 2009-74960 A

ところで、上述した従来の軸接地部材１０は、接地ブラシ３が回転する発電機軸１に継続的に押し付けられるため、磨耗が進み接地不良が生ずる問題があった。また、隣接する油切り部２からのミストや大気中の粉塵又は塗装作業等で発生する異物等が接地ブラシ３に付着し、接地不良を起こす問題があった。   By the way, the above-described conventional shaft grounding member 10 is continuously pressed against the generator shaft 1 on which the grounding brush 3 rotates, so that there is a problem in that the wear progresses and a grounding failure occurs. In addition, there is a problem that a mist from the adjacent oil draining portion 2, dust in the atmosphere, foreign matter generated by a painting operation, or the like adheres to the grounding brush 3 to cause a grounding failure.

そのため、定期的又は接地不良の検出時に接地ブラシ３を点検し、必要に応じて接地ブラシ３を交換する必要があるが、このような保守点検、交換作業は回転する発電機軸１近辺での作業となるため、落下物によって発電機軸１が破損したり、落下物の跳ね返りや発電機軸１への巻き込み等によって作業者が事故に遭う危険性があった。   Therefore, it is necessary to inspect the grounding brush 3 regularly or when grounding failure is detected and replace the grounding brush 3 as necessary. Such maintenance, inspection and replacement work is performed near the rotating generator shaft 1. Therefore, there is a risk that the generator shaft 1 may be damaged by a fallen object, or an operator may be involved in an accident due to a rebound of the fallen object or an entrainment in the generator shaft 1.

本発明は上記課題を解決するためになされたもので、接地ブラシの保守点検、交換作業を安全かつ効率的に実施することができる軸接地装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide a shaft grounding device capable of safely and efficiently performing maintenance inspection and replacement work of a grounding brush.

上記課題を解決するために、本発明の実施形態に係る軸接地装置は、軸受台の端部に少なくとも一つの軸接地部材を取り付け、当該軸接地部材により発電機軸で発生した軸電圧をアースする軸接地装置において、前記軸接地部材は前記軸受台の端部に固定された固定ブラケットと、前記固定ブラケットに対し変位可能に取り付けられた可動ブラケットと、前記可動ブラケットに取り付けられた接地ブラシと、からなり、前記接地ブラシは前記可動ブラケットが変位することにより発電機軸との接触位置から非接触位置に移動することを特徴とする。   In order to solve the above-described problem, an axial grounding device according to an embodiment of the present invention attaches at least one axial grounding member to an end of a bearing stand, and grounds a shaft voltage generated on a generator shaft by the axial grounding member. In the shaft grounding device, the shaft grounding member is a fixed bracket fixed to an end of the bearing base, a movable bracket attached to the fixed bracket so as to be displaceable, a grounding brush attached to the movable bracket, The grounding brush moves from a contact position with the generator shaft to a non-contact position when the movable bracket is displaced.

本発明の実施形態によれば、接地ブラシの保守点検、交換作業を安全かつ効率的に実施することができる。   According to the embodiment of the present invention, maintenance inspection and replacement work of the ground brush can be performed safely and efficiently.

（ａ）は第１の実施形態に係る軸接地部材の側面図、（ｂ）はアース時の軸接地部材のＡ−Ａ線矢視図、（ｃ）は保守点検時の軸接地部材のＡ−Ａ線矢視図。(A) is a side view of the shaft grounding member according to the first embodiment, (b) is an AA arrow view of the shaft grounding member at the time of grounding, and (c) is an A of the shaft grounding member during maintenance inspection. FIG. 第２の実施形態に係る軸接地部材の側面図。The side view of the shaft grounding member which concerns on 2nd Embodiment. 第２の実施形態の変形例に係る軸接地部材の側面図。The side view of the shaft grounding member which concerns on the modification of 2nd Embodiment. 第３の実施形態に係る軸接地部材の側面図。The side view of the shaft grounding member which concerns on 3rd Embodiment. 第４の実施形態に係る軸接地部材の側面図。The side view of the shaft grounding member which concerns on 4th Embodiment. 従来の軸接地装置の概観図。1 is a schematic view of a conventional shaft grounding device. （ａ）は従来の軸接地部材の側面図、（ｂ）はＡ−Ａ線矢視図。(A) is a side view of a conventional shaft grounding member, and (b) is a view taken along line AA.

以下、本発明に係る軸接地装置の実施形態について、図面を参照して説明する。
［第１の実施形態］
第１の実施形態に係る軸接地装置で用いられる軸接地部材を図１（ａ）〜（ｃ）により説明する。なお、従来の軸接地装置と同一又は類似の構成については同一の符号を付し、重複説明を省略する。 Hereinafter, an embodiment of a shaft grounding device according to the present invention will be described with reference to the drawings.
[First Embodiment]
A shaft grounding member used in the shaft grounding device according to the first embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the structure same or similar to the conventional shaft grounding apparatus, and duplication description is abbreviate | omitted.

（構成）
本実施形態に係る軸接地部材１０ａは、図１（ａ）〜（ｃ）に示すように、軸受台２０端部の油切り部２にボルト７等によって取り付け固定された固定ブラケット５と、銅編みブラシ等からなる接地ブラシ３がボルト１６等により保持固定された可動ブラケット６と、固定ブラケット５に対し可動ブラケット６を変位可能に係合する蝶番等からなる係合部材８と、から構成される。また、接地ブラシ３の背面には、接地ブラシ３を発電機軸１に確実に接触させるために板バネ４が設けられ、接地ブラシ３を発電機軸１の方へ付勢している。 (Constitution)
As shown in FIGS. 1A to 1C, the shaft grounding member 10 a according to the present embodiment includes a fixed bracket 5 that is attached and fixed to the oil draining portion 2 at the end of the bearing stand 20 with bolts 7, and copper. The grounding brush 3 made of a knitting brush or the like is composed of a movable bracket 6 held and fixed by a bolt 16 or the like, and an engaging member 8 made of a hinge or the like for movably engaging the movable bracket 6 with respect to the fixed bracket 5. The Further, a leaf spring 4 is provided on the back surface of the grounding brush 3 in order to make the grounding brush 3 contact the generator shaft 1 with certainty, and the grounding brush 3 is urged toward the generator shaft 1.

ここで、図１（ｂ）は固定ブラケット５と可動ブラケット６が係合部材８によって係合一体化している状態を示す図で、図１（ｃ）は係合部材８の係合状態が解除され、可動ブラケット６が固定ブラケット５から変位している状態、すなわち接地ブラシ３を保持している可動ブラケット６が係合部材８を軸として回動し、接地ブラシ３が発電機軸１との接触位置（図１（ｂ））から非接触位置（図１（ｃ））に移動した状態を示す図である。   Here, FIG. 1B is a view showing a state in which the fixed bracket 5 and the movable bracket 6 are integrally engaged by the engaging member 8, and FIG. 1C is a state in which the engaging state of the engaging member 8 is released. The movable bracket 6 is displaced from the fixed bracket 5, that is, the movable bracket 6 holding the grounding brush 3 rotates about the engaging member 8, and the grounding brush 3 contacts the generator shaft 1. It is a figure which shows the state which moved to the non-contact position (FIG.1 (c)) from a position (FIG.1 (b)).

（作用）
このように構成された軸接地部材１０ａにおいて、通常時には固定ブラケット５と可動ブラケット６は、図１（ｂ）に示すように、係合部材８によって相互に固定され、接地ブラシ３が回転する発電機軸１に接触することで、発電機軸１で発生した軸電圧を集電し、可動ブラケット６、固定ブラケット５、油切り部２及び軸受台２０に設けられたアース端子（図示せず）を通してアースされる。 (Function)
In the shaft grounding member 10a configured as described above, the stationary bracket 5 and the movable bracket 6 are normally fixed to each other by the engaging member 8 and the grounding brush 3 rotates as shown in FIG. 1B. By contacting the machine shaft 1, the shaft voltage generated in the generator shaft 1 is collected and grounded through a ground terminal (not shown) provided on the movable bracket 6, the fixed bracket 5, the oil draining portion 2, and the bearing base 20. Is done.

一方、保守点検時には、作業員が係合部材８の係合を解除し、係合部材８を回動軸として先端に接地ブラシ３が保持されている可動ブラケット６を固定ブラケット５から離反するように回動させる。これにより接地ブラシ３は発電機軸１から離反し非接触状態となる。その状態で接地ブラシ３の点検を行い、必要に応じて接地ブラシ３の交換作業を行う。   On the other hand, at the time of maintenance inspection, an operator releases the engagement of the engagement member 8 so that the movable bracket 6 holding the grounding brush 3 at the tip is separated from the fixed bracket 5 with the engagement member 8 as a rotation shaft. Turn to. As a result, the ground brush 3 is separated from the generator shaft 1 and is in a non-contact state. In this state, the grounding brush 3 is inspected, and if necessary, the grounding brush 3 is replaced.

（効果）
本実施形態によれば、軸接地部材に接地不良等の異常が生じた場合、蒸気タービン又は発電機の運転を中断することなく、効率的かつ安全に接地ブラシの保守点検作業又は交換作業を行うことができる。 (effect)
According to the present embodiment, when an abnormality such as poor grounding occurs in the shaft grounding member, maintenance and inspection work or replacement work of the grounding brush is performed efficiently and safely without interrupting the operation of the steam turbine or the generator. be able to.

［第２の実施形態］
第２の実施形態に係る軸接地部材１０ａを図２により説明する。なお、上記実施形態と同一又は類似の構成については同一の符号を付し、重複説明を省略する。
本実施形態では、可動ブラケット６を発電機軸１に対し軸直角方向に移動可能に固定ブラケット５に取り付ける構成としている。 [Second Embodiment]
The shaft grounding member 10a according to the second embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same or similar structure as the said embodiment, and duplication description is abbreviate | omitted.
In the present embodiment, the movable bracket 6 is attached to the fixed bracket 5 so as to be movable in a direction perpendicular to the axis with respect to the generator shaft 1.

具体的には、固定ブラケット５の発電機軸直角方向に凹部状又は溝状の案内部材９を設け、可動ブラケット６の対応する位置に案内部材９と嵌合しスライド移動する凸部を設ける（図示せず）。   Specifically, a concave or groove-shaped guide member 9 is provided in a direction perpendicular to the generator axis of the fixed bracket 5, and a convex portion that fits the guide member 9 and slides is provided at a corresponding position of the movable bracket 6 (see FIG. Not shown).

このように構成された本実施形態において、通常時には接地ブラシ３が回転する発電機軸１に接触する位置で可動ブラケット６を適宜な固定手段によって固定ブラケット５に固定する（図示せず）。   In the present embodiment configured as described above, the movable bracket 6 is fixed to the fixed bracket 5 by appropriate fixing means at a position in contact with the generator shaft 1 where the grounding brush 3 rotates during normal operation (not shown).

一方、保守点検時には、固定手段を解除することで、可動ブラケット６を案内部材９に沿って軸直角方向に移動させて接地ブラシ３を発電機軸１から離反させ、その状態で接地ブラシ３の点検を行い、必要に応じて接地ブラシ３の交換を行う。
なお、案内部材９を凸部状とし、可動ブラケット６に凸部状の案内部材９と嵌合する凹部又は溝部を設けてもよい。 On the other hand, at the time of maintenance inspection, by releasing the fixing means, the movable bracket 6 is moved in the direction perpendicular to the axis along the guide member 9 to move the grounding brush 3 away from the generator shaft 1, and in this state, the grounding brush 3 is inspected. And replace the grounding brush 3 as necessary.
Note that the guide member 9 may have a convex shape, and the movable bracket 6 may be provided with a concave portion or a groove portion that fits the convex-shaped guide member 9.

（変形例）
図３は第２の実施形態の変形例であり、固定ブラケット５に可動ブラケット６と螺合するねじ込みガイド１５を設け、ねじ込みガイド１５のハンドル１５ａを回転させることで、可動ブラケット６を案内部材９に沿って軸直角方向に移動させる構成としている。
これにより、接地ブラシ３を発電機軸１との接触位置又は非接触位置に位置決めさせるとともに、接触位置から非接触位置へ簡便かつ効率的に移動させることができる。 (Modification)
FIG. 3 shows a modified example of the second embodiment. A screwing guide 15 screwed to the movable bracket 6 is provided on the fixed bracket 5, and the handle 15 a of the screwing guide 15 is rotated, so that the movable bracket 6 is guided to the guide member 9. Is moved in the direction perpendicular to the axis.
As a result, the ground brush 3 can be positioned at a contact position or a non-contact position with the generator shaft 1 and can be easily and efficiently moved from the contact position to the non-contact position.

［第３の実施形態］
第３の実施形態に係る軸接地部材１０ａを図４により説明する。なお、上記実施形態と同一又は類似の構成については同一の符号を付し、重複説明を省略する。
上述した実施形態において、固定ブラケット５と可動ブラケット６を設けたことにより、両ブラケット間の導電性が悪化し導通不良が生じる可能性がある。 [Third Embodiment]
A shaft grounding member 10a according to a third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same or similar structure as the said embodiment, and duplication description is abbreviate | omitted.
In the embodiment described above, the provision of the fixed bracket 5 and the movable bracket 6 may deteriorate the electrical conductivity between the brackets and cause poor conduction.

本実施形態では、図４に示すように、第１の実施形態の固定ブラケット５の端部と可動ブラケット６の端部を電気ケーブル１１により接続する構成としている。
これにより、固定ブラケット５と可動ブラケット６との間の電気的接続が良好に維持されるので、発電機軸１で発生した軸電圧を確実にアースすることができる。 In the present embodiment, as shown in FIG. 4, the end of the fixed bracket 5 and the end of the movable bracket 6 of the first embodiment are connected by an electric cable 11.
Thereby, since the electrical connection between the fixed bracket 5 and the movable bracket 6 is maintained satisfactorily, the shaft voltage generated in the generator shaft 1 can be reliably grounded.

［第４の実施形態］
第４の実施形態に係る軸接地部材１０ｂを図５により説明する。なお、上記実施形態と同一又は類似の構成については同一の符号を付し、重複説明を省略する。
本実施形態では、軸接地部材を軸電圧測定装置１０ｂとして用いることを特徴としている。 [Fourth Embodiment]
The shaft grounding member 10b according to the fourth embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the same or similar structure as the said embodiment, and duplication description is abbreviate | omitted.
In this embodiment, the shaft grounding member is used as the shaft voltage measuring device 10b.

具体的には、軸電圧測定装置として使用する軸接地部材１０ｂは、固定ブラケット５及びボルト７をそれぞれ絶縁シート１２及び絶縁ブッシュ等からなる絶縁部材１３を介して油切り部２に取り付けることで、接地ブラシ３を油切り部２から絶縁させるとともに、固定ブラケット５を電気ケーブルにより軸電圧測定装置（図示せず）に接続することで、接地ブラシ３が集電した軸電圧を測定する。   Specifically, the shaft grounding member 10b used as the shaft voltage measuring device is provided by attaching the fixing bracket 5 and the bolt 7 to the oil draining portion 2 via the insulating member 13 including the insulating sheet 12 and the insulating bush, respectively. The ground brush 3 is insulated from the oil draining portion 2, and the shaft voltage collected by the ground brush 3 is measured by connecting the fixing bracket 5 to the shaft voltage measuring device (not shown) by an electric cable.

軸電圧を測定することで、磁気不平衡や羽根および羽根車と蒸気との間の回転摩擦を監視することができるとともに、軸接地部材１０ｂの異常も検出することができる。
軸接地部材１０ｂの異常を検出した場合は、上記実施形態で説明した態様で、接地ブラシ３の点検を行い、必要に応じて接地ブラシ３の交換を行う。 By measuring the shaft voltage, it is possible to monitor magnetic imbalance and rotational friction between the blades and the impeller and the steam, and it is also possible to detect an abnormality in the shaft grounding member 10b.
When an abnormality is detected in the shaft grounding member 10b, the grounding brush 3 is inspected in the manner described in the above embodiment, and the grounding brush 3 is replaced as necessary.

（変形例）
本変形例では、電気ケーブル１４を軸電圧測定装置又はアース端子（図示せず）に切り替え可能に接続する構成としている。したがって、軸電圧を測定する軸接地部材１０ｂの電気ケーブル１４を軸電圧測定装置に接続する代わりにアース端子を接続することで、アース用の軸接地部材としても利用することができる。これにより、軸接地部材１０ｂを軸電圧測定用又はアース用に用いることができるので、現場のニーズに応じた軸接地装置を構成することができる。 (Modification)
In this modification, the electric cable 14 is connected to an axial voltage measuring device or a ground terminal (not shown) so as to be switchable. Therefore, by connecting the ground terminal instead of connecting the electric cable 14 of the shaft grounding member 10b for measuring the shaft voltage to the shaft voltage measuring device, the shaft grounding member 10b can also be used as a shaft grounding member for grounding. As a result, the shaft grounding member 10b can be used for measuring the shaft voltage or for grounding, so that a shaft grounding device that meets the needs of the site can be configured.

［第５の実施形態］
第５の実施形態に係る軸接地装置は、上記の実施形態で説明したアース用の軸接地部材１０ａ及び軸電圧測定用の軸接地部材１０ｂをそれぞれ複数設けた構成としている。 [Fifth Embodiment]
The shaft grounding device according to the fifth embodiment has a configuration in which a plurality of grounding shaft grounding members 10a and a shaft voltage measuring shaft grounding member 10b described in the above embodiments are provided.

これにより、例えば、一つの軸接地部材を保守点検している場合でも、他の軸接地装置により、発電機軸１で発生した軸電圧を常時アースすることができるとともに、軸電圧の測定も継続して行うことができる。
また、軸電圧測定用として使用している軸接地部材１０ｂを、アース用に切替えることで、軸接地能力を適宜増減することができる。 Thereby, for example, even when one shaft grounding member is inspected and maintained, the shaft voltage generated in the generator shaft 1 can be always grounded by another shaft grounding device, and the measurement of the shaft voltage is continued. Can be done.
Further, the shaft grounding ability can be increased or decreased as appropriate by switching the shaft grounding member 10b used for shaft voltage measurement to ground.

以上、本発明の実施形態を説明したが、この実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。この新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、組み合わせ、置き換え、変更を行うことができる。この実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. The novel embodiment can be implemented in various other forms, and various omissions, combinations, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１…発電機軸、２…油切り部、３…接地ブラシ、４…板バネ、５…固定ブラケット、６…可動ブラケット、７…ボルト、８…係合部材、９…案内部材、１０，１０ａ，１０ｂ…軸接地部材、１１…電気ケーブル、１２…絶縁シート、１３…絶縁部材、１４…電気ケーブル、１５…ねじ込みガイド、１６…ボルト、２０…軸受台。   DESCRIPTION OF SYMBOLS 1 ... Generator shaft, 2 ... Oil drain part, 3 ... Grounding brush, 4 ... Leaf spring, 5 ... Fixed bracket, 6 ... Movable bracket, 7 ... Bolt, 8 ... Engagement member, 9 ... Guide member 10, 10a, DESCRIPTION OF SYMBOLS 10b ... Shaft grounding member, 11 ... Electric cable, 12 ... Insulating sheet, 13 ... Insulating member, 14 ... Electric cable, 15 ... Screwing guide, 16 ... Bolt, 20 ... Bearing stand.

Claims (6)

軸受台の端部に少なくとも一つの軸接地部材を取り付け、当該軸接地部材により発電機軸で発生した軸電圧をアースする軸接地装置において、
前記軸接地部材は前記軸受台の端部に固定された固定ブラケットと、前記固定ブラケットに対し変位可能に取り付けられた可動ブラケットと、前記可動ブラケットに取り付けられた接地ブラシと、からなり、
前記接地ブラシは前記可動ブラケットが変位することにより発電機軸との接触位置から非接触位置に移動することを特徴とする軸接地装置。 In the shaft grounding device that attaches at least one shaft grounding member to the end of the bearing stand and grounds the shaft voltage generated in the generator shaft by the shaft grounding member,
The shaft grounding member comprises a fixed bracket fixed to an end of the bearing base, a movable bracket attached to the fixed bracket so as to be displaceable, and a grounding brush attached to the movable bracket,
The shaft grounding device, wherein the grounding brush moves from a contact position with a generator shaft to a non-contact position when the movable bracket is displaced. 前記固定ブラケットと可動ブラケットの一端部を係合部材により係合し、前記可動ブラケットを前記係合部材を軸として回動可能に構成したことを特徴とする請求項１記載の軸接地装置。   The shaft grounding device according to claim 1, wherein one end of the fixed bracket and the movable bracket are engaged by an engagement member, and the movable bracket is configured to be rotatable about the engagement member. 前記固定ブラケットの発電機軸直角方向に案内部材を設け、前記可動ブラケットを前記案内部材に沿って移動可能に構成したことを特徴とする請求項１又は２記載の軸接地装置。   The shaft grounding device according to claim 1, wherein a guide member is provided in a direction perpendicular to the generator shaft of the fixed bracket, and the movable bracket is configured to be movable along the guide member. 前記可動ブラケットに螺合するねじ込みガイドを前記固定ブラケットに設け、当該ねじ込みガイドを回転させることにより、前記可動ブラケットを前記案内部材に沿って移動させることを特徴とする請求項３記載の軸接地装置。   The shaft grounding device according to claim 3, wherein a screw guide that is screwed to the movable bracket is provided on the fixed bracket, and the movable bracket is moved along the guide member by rotating the screw guide. . 前記軸接地部材の固定ブラケットを絶縁部材を介して前記軸受台の端部に固定し、前記固定ブラケットを電気ケーブルを介して軸電圧測定装置に接続することにより、前記発電機軸で発生した軸電圧を測定することを特徴とする請求項１乃至４のいずれか１項に記載の軸接地装置。   A shaft voltage generated at the generator shaft by fixing a fixed bracket of the shaft grounding member to an end portion of the bearing base via an insulating member and connecting the fixed bracket to a shaft voltage measuring device via an electric cable. The shaft grounding device according to claim 1, wherein the shaft grounding device is measured. 前記固定ブラケットを電気ケーブルにより軸電圧測定装置又はアース端子に切り替え可能に接続したことを特徴とする請求項５記載の軸接地装置。   6. The shaft grounding device according to claim 5, wherein the fixed bracket is connected to a shaft voltage measuring device or a ground terminal by an electric cable so as to be switchable.
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US10158274B2 (en) 2015-05-01 2018-12-18 Meidensha Corporation Rotary machine
WO2019185420A1 (en) * 2018-03-27 2019-10-03 Schunk Bahn- Und Industrietechnik Gmbh Discharge device
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