JP4582843B2 - Bearing device with electric corrosion prevention function used for bearing of rotating shaft in underwater rotating machine - Google Patents

Bearing device with electric corrosion prevention function used for bearing of rotating shaft in underwater rotating machine Download PDF

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Publication number
JP4582843B2
JP4582843B2 JP32140099A JP32140099A JP4582843B2 JP 4582843 B2 JP4582843 B2 JP 4582843B2 JP 32140099 A JP32140099 A JP 32140099A JP 32140099 A JP32140099 A JP 32140099A JP 4582843 B2 JP4582843 B2 JP 4582843B2
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Prior art keywords
bearing
rotating shaft
rotating
underwater
function used
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JP2001140913A (en
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秀雄 福森
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Tsurumi Manufacturing Co Ltd
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Tsurumi Manufacturing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/002—Conductive elements, e.g. to prevent static electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F16C2202/32—Conductivity

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Bearings Or Others (AREA)

Description

【０００１】
【発明の技術分野】
本発明は、主として水中電動ポンプや曝気・撹拌装置など、水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置に関するものである。
【０００２】
【従来技術とその問題点】
水中電動ポンプや曝気・撹拌装置など、水中回転機械においては、接液部や回転体部分と静止体部分との間隙付近で特に腐食を生じやすい。腐食の要因が金属表面に形成される腐食電池の作用によるものであることは既に解明されており、腐食電池のアノード部とカソード部の電位差をなくすることができたならば、腐食電流が流れなくなって腐食は停止することになる。
【０００３】
しかしながら水中電動ポンプや曝気・撹拌装置など、水中回転機械の回転軸は軸受により支承されており、軸受の内輪と外輪とはボールを介してほとんど点接触に近い状態で接触しているのに過ぎず、しかも内外輪の対向面間の空隙部には潤滑用のグリースが充填されており、そのグリースは非導電性であるため、回転軸の回転時には内外輪とボールとの接触部分に絶縁油膜が形成せられ、軸受内輪およびそれに連なる回転体部分と、軸受外輪およびそれに連なる静止体部分とは完全に絶縁された状態となり、電位差によって腐食を生じることは避けられない。
【０００４】
軸受の内外輪間を電気的に導通させるための手段として、外輪内周部から導出された金属バネ板を内輪外周面へ摺接させることも試みられているが、回転時の摩耗係数が増大して動力損失が大きくなり、かつ、バネ板の摩耗も激しくて耐久性に乏しく、到底実用に供することはできないものである。
【０００５】
【発明の目的】
本発明の目的は、水中回転機械の駆動時に回転体部分と静止体部分に生じる電位差をなくし、かつ、摩耗係数を増大させることなく恒久的で有効な電食防止機能を有する、軸承装置を提供することにある。
【０００６】
【発明の構成】
本発明に係る水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置においては、軸受内輪を静合させた回転体部分の回転軸の軸端部にグリース溜まりを凹設し、軸受外輪を静合させた静止体部分のベアリングブラケット、または該ベアリングブラケットの中央部を蓋装するベアリングカバーから導延された回転軸の回転方向に沿って巻き下がるように形成された螺旋状の導電体をグリース溜まり内へ挿入すると共に、導電グリースをグリース溜まり内へ容入して上記ベアリングブラケットと回転軸とを電気的に導通し、モータを含めて水中につけて使用される水中回転機械の駆動時において、上記静止体と回転体部分間に生じる電位差がなくなることで腐食電流の流れをなくすると共に、静止体部分と電気的に導通させて静止体部分の外側接液部に装着された流電陽極の溶出による防食電流の流れを形成させた。
【０００７】
【発明の実施の形態】
以下水中ポンプの回転軸支承に用いた電食防止機能を有した軸承装置の事例について説明をする。
【０００８】
図２において、１はモータ回転子２に嵌着された回転軸であって、その負荷側導出端には羽根車３が装着されている。４Ａは回転軸１の反負荷側軸受であって、図１および図３ないし図７に詳示するように回転軸１に静合する軸受内輪５と、ベアリングブラケット６に静合する軸受外輪７とがボール８を介して対向している。９ｃは回転軸１の反負荷側軸端部に凹設されたグリース溜まり、１０ｃは先端部をグリース溜まり９ｃ内へ挿入させた螺旋状の導電体であり、図１ないし図４に示すようベアリングブラケット６から導延してグリース溜まり９ｃ内へ挿入し、または図５ないし図７に示すようベアリングブラケット６の中央部を蓋装するベアリングカバー１０ｂの裏面から導延してグリース溜まり９ｃ内へ挿入すると共に、導電グリース１１をグリース溜まり９ｃ内へ容入する。グリース溜まり９ｃ内へ挿入される螺旋状の導電体１０ｃは、導電グリースとの接触面積を増大させるため螺旋状に形成されているが、その具体的形態としては、図１および図５に示すよう金属線をコイルスプリング状に巻回したもの、図３および図６に示すよう金属杵の外周に螺条を形成させたもの、図４および図７に示すよう金属杵の下端部のみを螺旋状に形成させたものであるが、螺条が回転軸１の回転方向に沿って巻き上がるように形成されてあれば導電グリース１１がグリース溜まり９ｃから外方へ飛散することになるので、螺条が回転方向に沿って巻き下がるように形成されていることが肝要である。
【０００９】
上述の導電グリース１１はもともと静電気防止用として、カーボンとグリースを混ぜ合わせ必要に応じリチュームを添加して作られ、各種機械類の帯電防止に有効なものとされているが、これが前記グリース溜まり９ｃ内で導電体１０ｃと接しておれば、導電性に優れているという特性によって回転軸１とベアリングカバー１０ｂおよびベアリングブラケット６とが電気的に導通せられ、延いては回転軸１に連なるモータ回転子２や羽根車３などの回転体部分と、ベアリングブラケット６に連なるモータ外胴１２やヘッドカバー１３などの静止体部分とが電気的に導通することになる。１６はアルミニウム合金など電位の低い金属で作られた流電陽極であり、該静止体部分と電気的に導通するように例えばヘッドカバー１３などの接液部に装着されている。
【００１０】
【作用】
上述のように回転体部分と静止体部分とを電気的に導通させることができるため、駆動時において上記両部分間に生じる電位差がなくなり、腐食電流が流れなくなることで電食防止機能を有すると共に、上記静止体部分と電気的に導通された流電陽極の溶出による防食電流の流れが形成されるのでより一層の防食作用を生じる。
【００１１】
【発明の効果】
本発明の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置を用いることにより、水中回転機械の駆動時に回転体部分と静止体部分に生じる電位差電位差がなくなることで腐食電流が流れなくなり、かつ、摩耗係数を増大させることなく恒久的で有効な電食防止機能を有することになる。
【図面の簡単な説明】
【図１】本発明軸承装置の縦断側面図であって、ベアリングブラケットから導延された螺旋状の導電体が金属線をコイルスプリング状に巻回したものである事例を示す。
【図２】図１の軸承装置を用いた水中電動ポンプの縦断側面図である。
【図３】本発明軸承装置の縦断側面図であって、ベアリングブラケットから導延された螺旋状の導電体が金属杵の外周に螺条を形成させたものである事例を示す。
【図４】本発明軸承装置の縦断側面図であって、ベアリングブラケットから導延された螺旋状の導電体が金属杵の下端部のみを螺旋状に形成させたものである事例を示す。
【図５】本発明軸承装置の縦断側面図であって、ベアリングカバーの裏面から導延された螺旋状の導電体が金属線をコイルスプリング状に巻回したものである事例を示す。
【図６】本発明軸承装置の縦断側面図であって、ベアリングカバーの裏面から導延された螺旋状の導電体が金属杵の外周に螺条を形成させたものである事例を示す。
【図７】本発明軸承装置の縦断側面図であって、ベアリングカバーの裏面から導延された螺旋状の導電体が金属杵の下方部のみを螺旋状に形成させたものである事例を示す。
【符号の説明】
１ 回転軸
５ 軸受内輪
６ ベアリングブラケット
７ 軸受外輪
９ｃ グリース溜まり
１０ｂ ベアリングカバー
１０ｃ 螺旋状の導電体
１１ 導電グリース
１６ 流電陽極 [0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bearing device having an electrolytic corrosion prevention function mainly used for supporting a rotating shaft in an underwater rotating machine such as an underwater electric pump and an aeration / stirring device.
[0002]
[Prior art and its problems]
In an underwater rotating machine such as an underwater electric pump or an aeration / stirring device, corrosion is particularly likely to occur in the vicinity of a wetted part or a gap between a rotating part and a stationary part. It has already been elucidated that the cause of corrosion is due to the action of the corrosion cell formed on the metal surface. If the potential difference between the anode and cathode of the corrosion cell can be eliminated, the corrosion current flows. The corrosion will stop after it disappears.
[0003]
However, the rotating shafts of submersible rotary machines, such as submersible electric pumps and aeration / stirring devices, are supported by bearings, and the inner ring and outer ring of the bearing are in contact with each other almost in a point contact manner via balls. In addition, the gap between the opposing surfaces of the inner and outer rings is filled with lubricating grease, and the grease is non-conductive. Therefore, when the rotary shaft rotates, an insulating oil film is formed on the contact portion between the inner and outer rings and the ball. Thus, the inner ring of the bearing and the rotating part connected to the inner ring are completely insulated from the outer part of the bearing and the stationary part connected thereto, and it is inevitable that corrosion occurs due to a potential difference.
[0004]
As a means for electrically connecting the inner and outer rings of the bearing, an attempt has been made to slidably contact the metal spring plate led out from the inner periphery of the outer ring to the outer peripheral surface of the inner ring, but the wear coefficient during rotation has increased. As a result, the power loss increases and the spring plate is severely worn and poor in durability, and cannot be put to practical use.
[0005]
OBJECT OF THE INVENTION
An object of the present invention is to provide a bearing device that eliminates a potential difference generated between a rotating body portion and a stationary body portion when driving an underwater rotating machine, and has a permanent and effective electrolytic corrosion prevention function without increasing a wear coefficient. There is to do.
[0006]
[Structure of the invention]
In a bearing device having an electrolytic corrosion prevention function used for supporting a rotating shaft in an underwater rotating machine according to the present invention, a grease reservoir is provided in the shaft end portion of the rotating shaft of a rotating body portion in which a bearing inner ring is stationary. The bearing bracket of the stationary body portion where the bearing outer ring is stationary , or the spiral formed so as to be rolled down along the rotation direction of the rotating shaft led from the bearing cover covering the center portion of the bearing bracket with the Jo conductor inserted into the grease reservoir, a conductive grease to containers entering into the grease reservoir to electrical conduction and shaft rotation with the bearing bracket, underwater rotating used immersed in water, including the motor When the machine is driven, the potential difference generated between the stationary body and the rotating body is eliminated, eliminating the flow of corrosion current and electrically connecting to the stationary body. So the flow of corrosion current by elution of galvanic anodes mounted on the outer wetted portion of the stationary body portion was formed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An example of a bearing device having an electrolytic corrosion prevention function used for rotating shaft support of a submersible pump will be described below.
[0008]
In FIG. 2, reference numeral 1 denotes a rotating shaft fitted to the motor rotor 2, and an impeller 3 is attached to the load side outlet end. 4A is an anti-load side bearing of the rotating shaft 1, and as shown in detail in FIG. 1 and FIGS. 3 to 7, a bearing inner ring 5 that fits the rotating shaft 1 and a bearing outer ring 7 that fits the bearing bracket 6 are shown. Are opposed to each other through the ball 8. 9c is a grease reservoir recessed at the end of the rotating shaft 1 on the side opposite to the load side, and 10c is a helical conductor having a tip portion inserted into the grease reservoir 9c, as shown in FIGS. It is extended from the bracket 6 and inserted into the grease reservoir 9c, or as shown in FIGS. 5 to 7, it is introduced from the back surface of the bearing cover 10b covering the center of the bearing bracket 6 and inserted into the grease reservoir 9c. At the same time, the conductive grease 11 is put into the grease reservoir 9c. The spiral conductor 10c inserted into the grease reservoir 9c is formed in a spiral shape in order to increase the contact area with the conductive grease. As a specific form thereof, as shown in FIGS. A metal wire wound in a coil spring shape, a thread formed on the outer periphery of the metal rod as shown in FIGS. 3 and 6, and only the lower end of the metal rod as shown in FIGS. 4 and 7 is spiral. However, if the thread is formed so as to roll up along the rotation direction of the rotary shaft 1, the conductive grease 11 will be scattered outward from the grease reservoir 9c. It is essential that is formed so as to be rolled down along the rotation direction.
[0009]
The above-mentioned conductive grease 11 is originally made for mixing with carbon and grease for the prevention of static electricity and adding a recombination as required, and is effective in preventing the charging of various machines. This is the grease reservoir 9c. If it is in contact with the conductor 10c, the rotating shaft 1 and the bearing cover 10b and the bearing bracket 6 are electrically connected to each other due to the property of excellent conductivity. The rotating body parts such as the child 2 and the impeller 3 and the stationary body parts such as the motor outer body 12 and the head cover 13 connected to the bearing bracket 6 are electrically connected. Reference numeral 16 denotes a galvanic anode made of a low-potential metal such as an aluminum alloy, and is attached to a wetted part such as the head cover 13 so as to be electrically connected to the stationary body part .
[0010]
[Action]
Since the stationary body portion and the rotating body portion as described above may be electrically conductive, there is no potential difference between the both parts during driving, which has electrolytic corrosion prevention that the corrosion current stops flowing , resulting in further corrosion effects since the flow of corrosion current by elution of the stationary body portion and electrically connected to the galvanic anode Ru is formed.
[0011]
【The invention's effect】
By using a bearing device having an electric corrosion prevention function used for supporting a rotating shaft in the underwater rotating machine of the present invention, the potential difference potential difference generated between the rotating body part and the stationary body part when driving the underwater rotating machine is eliminated, and corrosion current does not flow, and becomes Rukoto to have a permanent and effective electrical corrosion prevention function without increasing the wear coefficient.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a bearing device of the present invention, showing an example in which a spiral conductor led from a bearing bracket is a metal wire wound in a coil spring shape.
2 is a longitudinal side view of a submersible electric pump using the bearing device of FIG. 1. FIG.
FIG. 3 is a longitudinal side view of the bearing device of the present invention, showing an example in which a spiral conductor led from a bearing bracket is formed with a thread on the outer periphery of a metal rod.
FIG. 4 is a longitudinal side view of the bearing device of the present invention, showing an example in which a spiral conductor led from a bearing bracket is formed by spirally forming only the lower end portion of a metal rod.
FIG. 5 is a vertical side view of the bearing device of the present invention, showing an example in which a spiral conductor led from the back surface of a bearing cover is a metal wire wound in a coil spring shape.
FIG. 6 is a longitudinal side view of the bearing device of the present invention, showing an example in which a spiral conductor extended from the back surface of a bearing cover is formed with a thread on the outer periphery of a metal rod.
FIG. 7 is a longitudinal side view of the bearing device of the present invention, showing an example in which a spiral conductor extended from the back surface of the bearing cover is formed in a spiral shape only at the lower part of the metal rod. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating shaft 5 Bearing inner ring 6 Bearing bracket 7 Bearing outer ring 9c Grease pool 10b Bearing cover 10c Spiral conductor 11 Conductive grease
16 galvanic anode

Claims (8)

軸受内輪を静合させた回転体部分の回転軸の軸端部にグリース溜まりを凹設し、軸受外輪を静合させた静止体部分のベアリングブラケットから導延して回転軸の回転方向に沿って巻き下がるように形成された螺旋状の導電体をグリース溜まり内へ挿入すると共に、導電グリースをグリース溜まり内へ容入して上記ベアリングブラケットと回転軸とを電気的に導通し、モータを含めて水中につけて使用される水中回転機械の駆動時において、上記静止体と回転体部分間に生じる電位差がなくなることで腐食電流の流れをなくすると共に、静止体部分と電気的に導通させて静止体部分の外側接液部に装着された流電陽極の溶出により防食電流の流れを形成させたことを特徴とする、水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。A grease reservoir is recessed in the shaft end of the rotating part of the rotating part where the inner ring of the bearing is stationary, and is guided from the bearing bracket of the stationary part where the outer ring of the bearing is fixed , along the rotational direction of the rotating shaft. A helical conductor formed so as to be rolled down is inserted into the grease reservoir, and the conductive grease is inserted into the grease reservoir to electrically connect the bearing bracket and the rotating shaft , including the motor. When driving a submersible rotating machine that is used underwater, the potential difference generated between the stationary body and the rotating body part is eliminated, so that the flow of corrosion current is eliminated and the stationary body part is electrically connected and stationary. characterized in that to form a flow of corrosion current elution galvanic anodes mounted on the outer wetted portion of the body part, the electrolytic corrosion prevention function used for supporting the rotary shaft in water rotary machine The Bearing apparatus. 螺旋状の導電体が、金属線をコイルスプリング状に巻回したものであることを特徴とする、請求項１記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。2. A bearing having an electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 1 , wherein the spiral conductor is a metal wire wound in a coil spring shape. apparatus. 螺旋状の導電体が、金属杵の外周に螺条を形成させたものであることを特徴とする、請求項１記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。2. The electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 1 , wherein the spiral conductor is formed by forming a thread on the outer periphery of the metal rod. Bearing device. 螺旋状の導電体が、金属杵の下端部のみを螺旋状に形成させたものであることを特徴とする、請求項１記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。2. The electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 1 , wherein the spiral conductor is formed by spirally forming only the lower end portion of the metal rod. It has been Bearing apparatus. 軸受内輪を静合させた回転体部分の回転軸の軸端部にグリース溜まりを凹設し、軸受外輪を静合させた静止体部分のベアリングブラケットの中央部をベアリングカバーで蓋装し、ベアリングカバーの裏面から導延された回転軸の回転方向に沿って巻き下がるように形成された螺旋状の導電体をグリース溜まり内へ挿入すると共に、導電グリースをグリース溜まり内へ容入して上記ベアリングブラケットと回転軸とを電気的に導通し、モータを含めて水中につけて使用される水中回転機械の駆動時において、上記静止体と回転体部分間に生じる電位差がなくなることで腐食電流の流れをなくすると共に、静止体部分と電気的に導通させて静止体部分の外側接液部に装着された流電陽極の溶出により防食電流の流れを形成させたことを特徴とする、水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。A grease reservoir is recessed in the shaft end of the rotating shaft of the rotating part where the bearing inner ring is fitted, and the center part of the bearing bracket of the stationary part where the bearing outer ring is fixed is covered with a bearing cover. A spiral conductor formed so as to be rolled down along the rotation direction of the rotating shaft led from the back surface of the cover is inserted into the grease reservoir, and the conductive grease is inserted into the grease reservoir, and the bearing is The electrical current between the bracket and the rotating shaft is electrically connected, and when driving an underwater rotating machine used underwater including a motor, the potential difference generated between the stationary body and the rotating body is eliminated, thereby reducing the flow of corrosion current. together eliminated, characterized in that to form a flow of corrosion current elution galvanic anodes mounted on the outer wetted portion of the stationary body portion and electrically connected to not be stationary body portion Bearing device having electrical corrosion prevention function used for supporting the rotary shaft in water rotary machine. 螺旋状の導電体が、金属線をコイルスプリング状に巻回したものであることを特徴とする、請求項５記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。6. A bearing having an electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 5 , wherein the spiral conductor is a metal wire wound in a coil spring shape. apparatus. 螺旋状の導電体が、金属杵の外周に螺条を形成させたものであることを特徴とする、請求項５記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。6. The electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 5 , wherein the spiral conductor is formed by forming a thread on the outer periphery of the metal rod. Bearing device. 螺旋状の導電体が、金属杵の下端部のみを螺旋状に形成させたものであることを特徴とする、請求項５記載の水中回転機械における回転軸の支承に用いられる電食防止機能を有した軸承装置。6. The electrolytic corrosion preventing function used for supporting a rotating shaft in an underwater rotating machine according to claim 5 , wherein the spiral conductor is formed by spirally forming only the lower end portion of the metal rod. It has been Bearing apparatus.
JP32140099A 1999-11-11 1999-11-11 Bearing device with electric corrosion prevention function used for bearing of rotating shaft in underwater rotating machine Expired - Fee Related JP4582843B2 (en)

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