JP6242566B2 - Electric corrosion prevention device - Google Patents

Electric corrosion prevention device Download PDF

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JP6242566B2
JP6242566B2 JP2012039871A JP2012039871A JP6242566B2 JP 6242566 B2 JP6242566 B2 JP 6242566B2 JP 2012039871 A JP2012039871 A JP 2012039871A JP 2012039871 A JP2012039871 A JP 2012039871A JP 6242566 B2 JP6242566 B2 JP 6242566B2
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rotating shaft
conductor
static elimination
elimination member
shaft
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JP2013174326A (en
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林　慎之
慎之 林
小林　直樹
小林　　直樹
真孝 ▲柳▼田
真孝 ▲柳▼田
長谷川　泰士
泰士 長谷川
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Mitsubishi Heavy Industries Ltd
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Description

本発明は、電動モータによって回転する回転軸と、該回転軸を回転可能に支持する軸受と、該回転軸と電気的に接続された除電部材と、該除電部材を接地するアース線とを備え、回転軸に帯電した電荷を除去することで軸受が電食するのを防止する電食防止装置に関する。   The present invention includes a rotary shaft that is rotated by an electric motor, a bearing that rotatably supports the rotary shaft, a static elimination member that is electrically connected to the rotary shaft, and a ground wire that grounds the static elimination member. The present invention also relates to an electrolytic corrosion prevention device for preventing a bearing from electrolytic corrosion by removing electric charges charged on a rotating shaft.

例えばターボ冷凍機などの電動モータによって回転する回転軸を備える回転機械では、まれにその回転軸が帯電し、その帯電した電荷が回転軸を支持する軸受に電流となって流れることで、軸受に電食が発生する場合があった。かかる軸受の電食を防止する技術として、特許文献１には、例えば転がり軸受を構成する転動体をセラミックスで構成するなどして回転軸と軸受とを絶縁し、軸受の電食を防止する技術が開示されている。   For example, in a rotating machine equipped with a rotating shaft that is rotated by an electric motor such as a turbo refrigerator, the rotating shaft is rarely charged, and the charged electric charge flows as a current to a bearing that supports the rotating shaft. There was a case where electric corrosion occurred. As a technique for preventing the electric corrosion of such a bearing, for example, Patent Document 1 discloses a technique for preventing the electric corrosion of the bearing by insulating the rotating shaft and the bearing by, for example, forming a rolling element constituting the rolling bearing with ceramics. Is disclosed.

しかしながら、上述した特許文献１の転がり軸受は、転動体がセラミックス製であり、価格が高価であるとの問題がある。通常の鋼製の転動体からなる転がり軸受など、導電性材料によって形成される軸受の電食を防止する構成として、例えば図６に示すような電食防止装置が考えられる。   However, the rolling bearing of Patent Document 1 described above has a problem that the rolling elements are made of ceramics and are expensive. As a configuration for preventing electrolytic corrosion of a bearing formed of a conductive material, such as a rolling bearing made of a normal steel rolling element, for example, an electrolytic corrosion prevention device as shown in FIG. 6 can be considered.

この図６に示す電食防止装置１００は、電動モータ１０２の回転軸１０３と、該回転軸１０３を回転可能に支持する軸受１０６ａ、１０６ｂとを備えるとともに、該モータ回転軸１０３の外周面１０３aと当接する除電部材１１２と、該除電部材１１２を接地するアース線１１４を備えている。そして、回転軸１０３が除電部材１１２を介してアース線１１４によってアースされることで、回転軸１０３に帯電した電荷を除去し、軸受１０６ａ、１０６ｂが電食するのを防止する。なお、図中の符号１０８は例えば羽根などの被回転体、符号１０４は被回転体８の軸１１０と電動モータ１０２の回転軸１０３とを連結する軸カップリング、符号１１６は除電部材１１２を付勢して回転軸１０３の外周面１０３aと当接させる付勢バネなどの付勢機構である。   6 includes a rotating shaft 103 of an electric motor 102 and bearings 106a and 106b that rotatably support the rotating shaft 103, and an outer peripheral surface 103a of the motor rotating shaft 103. A neutralizing member 112 that abuts and a ground wire 114 that grounds the neutralizing member 112 are provided. Then, the rotating shaft 103 is grounded by the ground wire 114 through the static elimination member 112, thereby removing the electric charge charged in the rotating shaft 103 and preventing the bearings 106a and 106b from being electrolytically corroded. In the figure, reference numeral 108 denotes a rotating body such as a blade, reference numeral 104 denotes a shaft coupling that connects the shaft 110 of the rotating body 8 and the rotating shaft 103 of the electric motor 102, and reference numeral 116 denotes a static elimination member 112. An urging mechanism such as an urging spring that urges and contacts the outer peripheral surface 103 a of the rotating shaft 103.

特開２００７−１６８４６号公報JP 2007-16846 A 特許第４５６２２７１号公報Japanese Patent No. 4562271

しかしながら、上述した電食防止装置１００にあっては、潤滑油が回転軸１０３を伝って除電部材１１２まで到達し、回転軸１０３と除電部材１１２との接触部が流体潤滑状態となる可能性がある。このように、回転軸１０３と除電部材１１２との接触部が流体潤滑状態となると、両者間に電流が流れなくなり、回転軸１０３に帯電した電荷をアース線１１４によって除去することができなくなってしまう。   However, in the electric corrosion prevention apparatus 100 described above, there is a possibility that the lubricating oil reaches the static elimination member 112 through the rotary shaft 103 and the contact portion between the rotary shaft 103 and the static elimination member 112 is in a fluid lubrication state. is there. Thus, when the contact portion between the rotating shaft 103 and the charge removal member 112 is in a fluid lubrication state, no current flows between them, and the electric charge charged on the rotating shaft 103 cannot be removed by the ground wire 114. .

回転軸１０３と除電部材１１２との接触部が流体潤滑状態となるのを防止するためには、回転軸１０３の先端面１０３bに除電部材１１２を接触させることが有効と考えられる。接触部への油の浸入は、回転軸１０３と除電部材１１２とのすべり速度が速くなるほど発生し易くなるため、回転軸１０３の外周１０３aではなく、その先端面１０３bに除電部材１１２を接触させることで、回転軸１０３と除電部材１１２とのすべり速度を遅くすることができるからである。   In order to prevent the contact portion between the rotary shaft 103 and the static elimination member 112 from entering a fluid lubrication state, it is considered effective to bring the static elimination member 112 into contact with the tip surface 103b of the rotary shaft 103. Oil intrusion into the contact portion is more likely to occur as the sliding speed between the rotation shaft 103 and the charge removal member 112 increases. Therefore, the charge removal member 112 is brought into contact with the tip surface 103b of the rotation shaft 103 instead of the outer periphery 103a. This is because the sliding speed between the rotating shaft 103 and the charge removal member 112 can be reduced.

特許文献２には、回転軸の先端面に除電部材を接触させ、回転軸に帯電した電荷を該除電部材から除去する電食防止装置が開示されている。しかしながら、この特許文献２の電食防止装置では、除電部材と回転軸の先端面とが直に線接触しており、回転軸の先端面が摩耗してしまうため、定期的に回転軸を交換する必要があるとの問題がある。   Patent Document 2 discloses a galvanic corrosion prevention device that makes a charge removal member contact the tip surface of a rotation shaft and removes electric charges charged on the rotation shaft from the charge removal member. However, in the electric corrosion prevention device of Patent Document 2, the static elimination member and the tip surface of the rotating shaft are in direct line contact, and the tip surface of the rotating shaft is worn, so the rotating shaft is periodically replaced. There is a problem that needs to be done.

本発明は上述したような従来技術の課題に鑑みなされた発明であって、除電部材による回転軸の摩耗を防止でき、回転軸を交換する必要がない電食防止装置を提供することを目的としている。   The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide an electrolytic corrosion prevention device that can prevent wear of a rotating shaft by a charge removal member and that does not require replacement of the rotating shaft. Yes.

本発明は上述したような目的を達成するためになされた発明であって、
本発明の電食防止装置は、
電動モータによって回転する回転軸と、該回転軸を回転可能に支持する軸受と、該回転軸と電気的に接続された除電部材と、該除電部材を接地するアース線と、を備えた電食防止装置において、
前記除電部材は、前記回転軸の先端面に結合された導電体を介して、前記回転軸と電気的に接続されることを特徴とする。 The present invention is an invention made to achieve the above-described object,
The electric corrosion prevention device of the present invention is
An electroerosion comprising: a rotary shaft that is rotated by an electric motor; a bearing that rotatably supports the rotary shaft; a static elimination member that is electrically connected to the rotary shaft; and a ground wire that grounds the static elimination member. In the prevention device,
The neutralizing member is electrically connected to the rotating shaft through a conductor coupled to a tip surface of the rotating shaft.

このように本発明の電食防止装置は、回転軸の先端面に結合された導電体を介して、除電部材と回転軸とを電気的に接続する構成であり、回転軸と除電部材とが直に接触しないため、回転軸の先端面が摩耗しない。また、仮に導電体が摩耗した場合であっても、導電体だけを交換すればよいため、回転軸を交換する必要はない。   Thus, the electric corrosion prevention apparatus of the present invention is configured to electrically connect the static elimination member and the rotary shaft via the conductor coupled to the tip surface of the rotary shaft, and the rotary shaft and the static elimination member are connected to each other. Because it does not contact directly, the tip surface of the rotating shaft does not wear. Further, even if the conductor is worn, it is not necessary to replace the rotating shaft because only the conductor needs to be replaced.

また、導電体を介して除電部材と回転軸とを電気的に接続する構成としたことで、導電体の材質を回転軸の材質と異ならせることができる。例えば、導電体に摩耗し難い高硬度の材質のものを採用することで、導電体自身の摩耗を抑制することもできる。   In addition, since the static elimination member and the rotating shaft are electrically connected via the conductor, the material of the conductor can be different from the material of the rotating shaft. For example, it is possible to suppress wear of the conductor itself by adopting a high-hardness material that does not easily wear to the conductor.

また、長尺の棒状部材である回転軸の先端面に対して表面仕上げを行うのに比べ、導電体に対する方が表面仕上げを行い易い。よって、表面粗さの小さい導電体を用いることで、相手側である除電部材の摩耗を抑制することもできる。   In addition, it is easier to finish the surface with respect to the conductor as compared with the case where the surface finish is performed on the end surface of the rotating shaft, which is a long rod-shaped member. Therefore, by using a conductor having a small surface roughness, it is possible to suppress wear of the neutralizing member that is the counterpart.

また上記発明において、
前記導電体は、前記回転軸とともに回転する該導電体の回転中心位置において、前記除電部材と点接触するように構成されていることが望ましい。 In the above invention,
It is desirable that the conductor is configured to be in point contact with the charge removal member at a rotation center position of the conductor that rotates together with the rotation shaft.

このように、除電部材が導電体の回転中心位置と点接触するように構成されていれば、回転中心位置におけるすべり速度は０であるため、除電部材と導電体との接触部において殆ど摩耗が発生しない。   In this way, if the static elimination member is configured to make point contact with the rotation center position of the conductor, the sliding speed at the rotation center position is 0, so that there is almost no wear at the contact portion between the static elimination member and the conductor. Does not occur.

この際、前記導電体が球体状をなし、前記回転軸の先端面と溶接、ロウ付け、または接着の何れかの方法によって接合することで、導電体がその回転中心位置において除電部材と点接触する上記発明を簡単に構成することができる。このような球体状の導電体としては、高硬度で寸法精度が高く、かつ表面粗さも小さい、転がり軸受用の転動球を好適に用いることができる。   At this time, the conductor has a spherical shape and is joined to the tip surface of the rotating shaft by any method of welding, brazing, or bonding, so that the conductor is in point contact with the static elimination member at the rotation center position. The above invention can be easily configured. As such a spherical conductor, a rolling ball for a rolling bearing having high hardness, high dimensional accuracy, and low surface roughness can be suitably used.

また上記発明において、
前記導電体は、前記回転軸の先端面の中心部に形成されているネジ穴に螺合されることで前記回転軸に連結されるボルト部材とすることができる。 In the above invention,
The conductor may be a bolt member that is coupled to the rotating shaft by being screwed into a screw hole formed in a central portion of the tip surface of the rotating shaft.

このように、導電体をボルト部材とし、該導電体と回転軸の先端面とを螺合により連結することで、導電体が摩耗した場合にその交換を容易に行うことができる。またこの際、除電部材と接触するボルト部材の頭部を球面状に加工することで、導電体がその回転中心位置において除電部材と点接触するように構成することも可能である。   As described above, when the conductor is a bolt member and the conductor and the tip end surface of the rotating shaft are connected by screwing, the conductor can be easily replaced when worn. At this time, the head of the bolt member that comes into contact with the charge removal member is processed into a spherical shape, so that the conductor can be in point contact with the charge removal member at the rotation center position.

また上記発明において、
前記回転軸の先端面と、該先端面と隣接する軸受との間には、回転軸の外周面から凸設する油切り手段が形成されていることが望ましい。 In the above invention,
Desirably, oil draining means is provided between the tip surface of the rotating shaft and a bearing adjacent to the tip surface so as to protrude from the outer peripheral surface of the rotating shaft.

このような油切り手段が形成されていれば、潤滑油が回転軸を伝って除電部材に到達するのを防ぐことができる。   If such oil draining means is formed, it is possible to prevent the lubricating oil from reaching the charge removal member along the rotating shaft.

本発明によれば、回転軸の先端面に結合された導電体を介して、除電部材と回転軸とが電気的に接続するように構成されるため、除電部材による回転軸の摩耗を防止でき、回転軸を交換する必要がない電食防止装置を提供することができる。   According to the present invention, since the static elimination member and the rotary shaft are configured to be electrically connected via the conductor coupled to the tip surface of the rotary shaft, it is possible to prevent the rotary shaft from being worn by the static elimination member. It is possible to provide an electrolytic corrosion prevention device that does not require the rotation shaft to be replaced.

本発明の電食防止装置の全体構成を示した全体図である。It is the whole figure which showed the whole structure of the electric corrosion prevention apparatus of this invention. 本発明の導電体を示した概略側面図である。It is the schematic side view which showed the conductor of this invention. 本発明の別の実施形態の導電体を示した概略側面図である。It is the schematic side view which showed the conductor of another embodiment of this invention. 本発明の油切り手段を示した概略側面図である。It is the schematic side view which showed the oil draining means of this invention. 本発明の油切手段の別の実施形態を示した概略側面図である。It is the schematic side view which showed another embodiment of the oil draining means of this invention. 従来の電食防止装置の全体構成を示した全体図である。It is the whole figure which showed the whole structure of the conventional electric corrosion prevention apparatus.

以下、本発明の実施形態について、図面に基づいて詳細に説明する。
ただし、本発明の範囲は以下の実施形態に限定されるものではない。以下の実施形態に記載されている構成部品の寸法、材質、形状、その相対配置などは、特に記載がない限り、本発明の範囲をそれにのみ限定する趣旨ではなく、単なる説明例に過ぎない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
However, the scope of the present invention is not limited to the following embodiments. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are merely illustrative examples and are not intended to limit the scope of the present invention only unless otherwise specified.

図１は、本発明の電食防止装置の全体構成を示した全体図である。本発明の電食防止装置は、例えばターボ冷凍機などの電動モータによって回転する回転軸を備える回転機械に備えられる装置である。本発明の電食防止装置は、図１に示したように、回転軸３、軸受６ａ，６ｂ、除電部材１２、アース線１４、および導電体２０などから構成されている。   FIG. 1 is an overall view showing the overall configuration of the electrolytic corrosion prevention device of the present invention. The electric corrosion prevention apparatus of the present invention is an apparatus provided in a rotating machine including a rotating shaft that is rotated by an electric motor such as a turbo refrigerator. As shown in FIG. 1, the electrolytic corrosion preventing device of the present invention includes a rotating shaft 3, bearings 6 a and 6 b, a static eliminating member 12, a ground wire 14, and a conductor 20.

回転軸３は、金属などの導電性材料により形成された長尺の棒状部材である。回転軸３は、その基端が軸カップリング４を介して軸１０と連結されており、電動モータ２によって回転するように構成されている。また、軸１０には、例えば羽根などの被回転体８がその外周面１０ａに固定されている。   The rotating shaft 3 is a long rod-shaped member formed of a conductive material such as metal. The rotating shaft 3 has a base end connected to a shaft 10 via a shaft coupling 4 and is configured to rotate by the electric motor 2. In addition, a rotating body 8 such as a blade is fixed to the outer peripheral surface 10 a of the shaft 10.

軸受６ａ，６ｂは、例えば軸と軌道輪との間に玉やコロなどの転動体が配設された転がり軸受であり、上述した回転軸３を回転可能に支持している。軸受６ａ，６ｂは、金属などの導電性材料により形成され、その内部には潤滑性を高めるための潤滑油が封入されている。なお、本発明の軸受としては、すべり軸受や流体軸受なども採用可能であり、転がり軸受には限定されない。   The bearings 6a and 6b are, for example, rolling bearings in which rolling elements such as balls and rollers are disposed between the shaft and the raceway, and support the rotating shaft 3 described above in a rotatable manner. The bearings 6a and 6b are formed of a conductive material such as a metal, and a lubricating oil for enhancing lubricity is enclosed therein. In addition, a slide bearing, a fluid bearing, etc. are employable as a bearing of this invention, It is not limited to a rolling bearing.

除電部材１２は、例えばカーボンや銅などの導電性材料からなる円柱状の部材であって、後述する導電体２０を介して、上述した回転軸３の先端面３ｂと電気的に接続されている。また、この除電部材１２にはアース線１４が接続されており、このアース線１４によって除電部材１２が接地されている。また、この除電部材１２は、例えば付勢バネ１６などからなる付勢機構によって、後述する導電体２０の側に向かって付勢されている。   The static elimination member 12 is a columnar member made of a conductive material such as carbon or copper, and is electrically connected to the above-described distal end surface 3b of the rotary shaft 3 via a conductor 20 described later. . In addition, a ground wire 14 is connected to the static elimination member 12, and the static elimination member 12 is grounded by the ground wire 14. Further, the charge removal member 12 is biased toward the conductor 20 described later by a biasing mechanism including a biasing spring 16 or the like, for example.

また、回転軸３の先端面３ｂと軸受６ｂとの間には、後述する油切り手段３０がその外周面３ａから凸設している。なお、この油切り手段３０は、軸受が複数ある場合には、最も先端面３ｂに近い位置にある（先端面３ｂに隣接する）軸受６ｂと先端面３ｂとの間に形成される。   Moreover, between the front end surface 3b of the rotating shaft 3, and the bearing 6b, the oil draining means 30 mentioned later protrudes from the outer peripheral surface 3a. When there are a plurality of bearings, the oil draining means 30 is formed between the bearing 6b and the tip surface 3b that are closest to the tip surface 3b (adjacent to the tip surface 3b).

導電体２０は、例えば金属などの導電性材料から形成された、回転軸３および除電部材１２とは別体に構成された部材であり、回転軸３の先端面３ｂの中心部に結合される。この導電体２０は、例えば図２に示したような金属製の球体２０ａであり、回転軸３の先端面３ｂの中心部に形成されている接合用凹部３ｃに、例えば溶接、ロウ付け、または接着などの方法によって接合される。なお、接合用凹部１０ｃが形成されていない先端面３ｂに球体２０ａを接合することも可能であるが、一般に回転軸３の先端面３ｂの中心部には、回転軸３の搬送および位置決め用としての凹部が形成されており、この凹部を接合用凹部３ｃとして用いるとよい。   The conductor 20 is a member that is formed of a conductive material such as metal and is configured separately from the rotating shaft 3 and the charge removal member 12, and is coupled to the central portion of the tip surface 3 b of the rotating shaft 3. . The conductor 20 is, for example, a metal sphere 20a as shown in FIG. 2, and is welded, brazed, or the like, for example, to the joint recess 3c formed at the center of the tip surface 3b of the rotating shaft 3. They are joined by a method such as adhesion. It is possible to join the spherical body 20a to the tip surface 3b in which the joining concave portion 10c is not formed. Generally, however, the center of the tip surface 3b of the rotating shaft 3 is used for conveying and positioning the rotating shaft 3. It is good to use this recessed part as the recessed part 3c for joining.

このように構成される本発明の電食防止装置１は、回転軸３の先端面３ｂに結合された導電体２０を介して、除電部材１２と回転軸３とを電気的に接続する構成であり、回転軸３と除電部材１２とが直に接触していない。このため、回転軸１０が回転しても、回転軸３の先端面３ｂが摩耗しないようになっている。また、仮に導電体２０が摩耗した場合であっても、導電体２０だけを交換すればよく、回転軸３を交換する必要はない。   The electric corrosion prevention apparatus 1 of the present invention configured as described above has a configuration in which the charge removal member 12 and the rotary shaft 3 are electrically connected via the conductor 20 coupled to the distal end surface 3b of the rotary shaft 3. Yes, the rotating shaft 3 and the charge removal member 12 are not in direct contact. For this reason, even if the rotating shaft 10 rotates, the front end surface 3b of the rotating shaft 3 is not worn. Further, even if the conductor 20 is worn, it is only necessary to replace the conductor 20, and there is no need to replace the rotating shaft 3.

また、導電体２０を介して除電部材１２と回転軸３とを電気的に接続する構成としたことで、導電体２０の材質を回転軸３の材質と異ならせることができる。例えば、導電体２０に炭素鋼などの摩耗し難い高硬度の材質のものを採用することで、導電体自身の摩耗を抑制することもできる。   Further, since the static elimination member 12 and the rotary shaft 3 are electrically connected via the conductor 20, the material of the conductor 20 can be made different from the material of the rotary shaft 3. For example, it is possible to suppress wear of the conductor itself by adopting a high hardness material such as carbon steel which is hard to be worn as the conductor 20.

また、長尺の棒状部材である回転軸３の先端面３ｂに対して表面仕上げを行うのに比べ、導電体２０に対する方が表面仕上げを行い易い。よって、表面粗さの小さい導電体２０を用いることで、相手側である除電部材１２の摩耗を抑制することもできる。   Moreover, compared with performing surface finishing on the front end surface 3b of the rotating shaft 3 which is a long rod-shaped member, it is easier to perform surface finishing on the conductor 20. Therefore, by using the conductor 20 having a small surface roughness, it is possible to suppress wear of the neutralizing member 12 that is the counterpart.

また、導電体２０として図２に示したような球体２０ａを用いることで、回転軸３とともに回転する導電体２０（球体２０ａ）の回転中心位置ａにおいて、除電部材１２と導電体２０（球体２０ａ）とが点接触するように構成される。このように、導電体２０が、その回転中心位置ａにおいて除電部材１２と点接触するように構成されていれば、回転中心位置ａにおけるすべり速度は０であるため、除電部材１２と導電体２０との接触部において殆ど摩耗が発生しないようにすることができる。また、このような球体状の導電体２０としては、高硬度で寸法精度が高く、かつ表面粗さも小さい、転がり軸受用の転動球を好適に用いることができる。   Further, by using the sphere 20a as shown in FIG. 2 as the conductor 20, at the rotational center position a of the conductor 20 (sphere 20a) that rotates with the rotating shaft 3, the static elimination member 12 and the conductor 20 (sphere 20a). ) And point contact. Thus, if the conductor 20 is configured to make point contact with the static elimination member 12 at the rotation center position a, the sliding speed at the rotation center position a is 0. It is possible to prevent almost any wear from occurring at the contact portion. Moreover, as such a spherical conductor 20, a rolling ball for a rolling bearing having high hardness, high dimensional accuracy, and low surface roughness can be suitably used.

また、導電体２０としては、図３に示したような金属製のボルト部材２０ｂを採用することもできる。このボルト部材２０ｂは、回転軸１０の先端面３ｂの中心部に形成されているネジ穴１０ｄにその軸部２２ｂが螺合されることで、先端面３ｂに連結されている。また、ボルト部材２０ｂと先端面１０ｂとが連結した状態において、先端面３ｂから突出するボルト部材２０ｂの頭部２４ｂと除電部材１２とが接触することで、回転軸３と除電部材１２とが電気的に接続される。   Further, as the conductor 20, a metal bolt member 20b as shown in FIG. 3 may be employed. The bolt member 20b is coupled to the tip surface 3b by screwing the shaft portion 22b into a screw hole 10d formed at the center of the tip surface 3b of the rotary shaft 10. Further, in a state where the bolt member 20b and the tip surface 10b are connected, the head 24b of the bolt member 20b protruding from the tip surface 3b and the charge removal member 12 come into contact with each other, so that the rotary shaft 3 and the charge removal member 12 are electrically connected. Connected.

このように、導電体２０をボルト部材２０ｂとし、このボルト部材２０ｂと回転軸３の先端面３ｂとを螺合により連結する構成とすることで、導電体２０（ボルト部材２０ｂ）が摩耗した場合にその交換を容易に行うことが可能となる。またこの際、除電部材１２と接触するボルト部材２０ｂの頭部２４ｂを球面状に加工することで、除電部材１２がボルト部材２０ｂの回転中心位置ａと点接触するように構成することもできる。   In this way, when the conductor 20 (bolt member 20b) is worn by using the conductor 20 as a bolt member 20b and connecting the bolt member 20b and the tip surface 3b of the rotary shaft 3 by screwing. The replacement can be easily performed. At this time, the head 24b of the bolt member 20b that contacts the static eliminating member 12 is processed into a spherical shape, so that the static eliminating member 12 can be configured to make point contact with the rotational center position a of the bolt member 20b.

また、図１に示したように、本発明の電食防止装置１には、先端面３ｂと軸受６ｂとの間に、回転軸３の外周面３ａから凸設した油切り手段３０が形成されている。この油切り手段３０としては、例えば図４に示したような、回転軸３の外周面３ａに嵌挿されて固定された環状の板状部材３０ａが挙げられる。また例えば、図５に示したような、回転軸３の外周面３ａに一体的に形成された段部３０ｂも含まれる。   Further, as shown in FIG. 1, in the electrolytic corrosion prevention device 1 of the present invention, an oil draining means 30 is formed between the tip surface 3b and the bearing 6b so as to protrude from the outer peripheral surface 3a of the rotary shaft 3. ing. As this oil draining means 30, for example, as shown in FIG. 4, an annular plate-like member 30a that is fitted and fixed to the outer peripheral surface 3a of the rotating shaft 3 can be cited. In addition, for example, a step portion 30b integrally formed on the outer peripheral surface 3a of the rotating shaft 3 as shown in FIG. 5 is also included.

このような油切り手段３０が形成されていれば、軸受６ｂから漏れ出して回転軸３を伝って板状部材３０ａや段部３０ｂに到達した潤滑油は、図中の矢印ｆに示したように、外周方向に流れた後に遠心力によって飛散する。すなわち、このような油切り手段３０が形成されていれば、潤滑油が回転軸３を伝って除電部材１２に到達するのを防ぐことができ、回転軸３と除電部材１２との接触部が流体潤滑状態となって両者間に電流が流れなくなることを確実に防止できる。   If such oil draining means 30 is formed, the lubricating oil that leaks from the bearing 6b and reaches the plate-like member 30a and the stepped portion 30b through the rotating shaft 3 is indicated by an arrow f in the figure. Then, after flowing in the outer peripheral direction, it is scattered by centrifugal force. That is, if such oil draining means 30 is formed, it is possible to prevent the lubricating oil from reaching the static elimination member 12 through the rotary shaft 3, and the contact portion between the rotary shaft 3 and the static elimination member 12 is prevented. It is possible to reliably prevent the current from flowing between the two due to the fluid lubrication state.

以上、本発明の好ましい形態について説明したが、本発明は上記の形態に限定されるものではなく、本発明の目的を逸脱しない範囲での種々の変更が可能である。   As mentioned above, although the preferable form of this invention was demonstrated, this invention is not limited to said form, A various change in the range which does not deviate from the objective of this invention is possible.

本発明は、例えばターボ冷凍機などの電動モータによって回転する回転軸を備える回転機械において、その軸受の電食を防止することができる電食防止装置として好適に用いることができる。   INDUSTRIAL APPLICABILITY The present invention can be suitably used as a galvanic corrosion prevention device that can prevent galvanic corrosion of a bearing in a rotary machine that includes a rotating shaft that is rotated by an electric motor such as a turbo refrigerator.

１ 電食防止装置
２ 電動モータ
３ 回転軸
３ａ 外周面
３ｂ 先端面
３ｃ 接合用凹部
３ｄ ネジ穴
４ 軸カップリング
６ａ，６ｂ 軸受
８ 被回転体
１０ 軸
１２ 除電部材
１４ リード線
１６ 付勢バネ（付勢機構）
２０ 導電体
２０ａ 球体
２０ｂ ボルト部材
３０ 油切り手段
３０ａ 板状部材
３０ｂ 段部 DESCRIPTION OF SYMBOLS 1 Electric corrosion prevention apparatus 2 Electric motor 3 Rotating shaft 3a Outer peripheral surface 3b Front end surface 3c Connection recessed part 3d Screw hole 4 Shaft coupling 6a, 6b Bearing 8 To-be-rotated body 10 Shaft 12 Static elimination member 14 Lead wire 16 Energizing spring Force mechanism)
20 Conductor 20a Sphere 20b Bolt member 30 Oil draining means 30a Plate member 30b Stepped portion

Claims (3)

電動モータによって回転する、水平方向に沿って配置された回転軸と、
前記回転軸を回転可能に支持する軸受と、
前記回転軸の先端面に接合された、前記回転軸とは別体に構成された導電体と、
前記回転軸と前記導電体を介して電気的に接続された除電部材と、
前記除電部材を接地するアース線と、
前記除電部材を前記導電体の側に向かって付勢する付勢バネと、を備え、
前記導電体は球体状をなし、前記回転軸の先端面に形成されている円錐状の凹部に、溶接、ロウ付け、または接着され、
前記除電部材は円柱状をなし、一端面が前記導電体と接触し、他端面が前記付勢バネと接触し、周面が前記アース線と接触しており、
前記除電部材は、前記回転軸の前記先端面よりも、前記回転軸の軸方向において前記回転軸から遠ざかる側に位置する
ことを特徴とする電食防止装置。 A rotating shaft arranged along a horizontal direction that is rotated by an electric motor;
A bearing that rotatably supports the rotating shaft;
A conductor joined to the tip surface of the rotating shaft and configured separately from the rotating shaft;
A static elimination member electrically connected to the rotating shaft via the conductor;
An earth wire for grounding the static elimination member;
A biasing spring that biases the static elimination member toward the conductor,
The conductor has a spherical shape, and is welded, brazed, or bonded to a conical recess formed on a tip surface of the rotating shaft,
The static elimination member has a cylindrical shape, one end surface is in contact with the conductor, the other end surface is in contact with the biasing spring, and a peripheral surface is in contact with the ground wire ,
The electrolytic corrosion prevention device according to claim 1, wherein the static elimination member is located on a side farther from the rotary shaft in the axial direction of the rotary shaft than the tip surface of the rotary shaft . 前記導電体は、前記回転軸とともに回転する該導電体の回転中心位置において、前記除電部材と点接触するように構成されていることを特徴とする請求項１に記載の電食防止装置。   2. The electrolytic corrosion prevention device according to claim 1, wherein the electrical conductor is configured to make point contact with the static elimination member at a rotational center position of the electrical conductor that rotates together with the rotational shaft. 前記回転軸の先端面と、該先端面と隣接する軸受との間には、回転軸の外周面から凸設する油切り手段が形成されていることを特徴とする請求項１又は２に記載の電食防止装置。   The oil draining means which protrudes from the outer peripheral surface of a rotating shaft is formed between the front end surface of the said rotating shaft, and the bearing adjacent to this front end surface, The Claim 1 or 2 characterized by the above-mentioned. Electric corrosion prevention device.
JP2012039871A 2012-02-27 2012-02-27 Electric corrosion prevention device Expired - Fee Related JP6242566B2 (en)

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JP2002034205A (en) * 2000-07-17 2002-01-31 Shicoh Eng Co Ltd Fan motor with oil-retaining bearing
JP4381664B2 (en) * 2002-08-23 2009-12-09 Ｎｔｎ株式会社 Current-carrying bearing
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