JP2003083454A - Rotary main shaft corrosion prevention device for underwater rotating machine - Google Patents
Rotary main shaft corrosion prevention device for underwater rotating machineInfo
- Publication number
- JP2003083454A JP2003083454A JP2001277973A JP2001277973A JP2003083454A JP 2003083454 A JP2003083454 A JP 2003083454A JP 2001277973 A JP2001277973 A JP 2001277973A JP 2001277973 A JP2001277973 A JP 2001277973A JP 2003083454 A JP2003083454 A JP 2003083454A
- Authority
- JP
- Japan
- Prior art keywords
- housing
- rotating
- main shaft
- rotating machine
- shaft hole
- 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.)
- Granted
Links
Landscapes
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、水中電動ポンプや曝気・
攪拌装置など、水中回転機械の回転主軸防食装置に関す
るものである。TECHNICAL FIELD The present invention relates to a submersible electric pump, an aeration
The present invention relates to a rotating main shaft anticorrosion device for an underwater rotating machine such as a stirring device.
【０００２】[0002]
【従来技術とその問題点】水中電動ポンプや曝気・攪拌
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隙間付近で特に腐食を生じ易い。腐
食の要因が金属表面に形成される腐食電池の作用や、異
種金属同士の接触によ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無くす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。そこ
で水中回転機械の接液静止体、例えばヘッドカバーの外
表面等に流電陽極を取付けて、電気的に繋がりのある静
止体の全域に防食電流を流すことで静止体を防食するこ
とは一般に行われている。2. Description of the Related Art In an underwater rotating machine such as an underwater electric pump or an aeration / agitation device, corrosion is particularly likely to occur near a liquid contact part or a gap between a rotating part and a stationary part. It has already been clarified that the cause of corrosion is due to the action of the corrosive battery formed on the metal surface or the action of the corrosive battery due to the contact between different metals, eliminating the potential difference between the anode and cathode parts of the corrosive battery. If so, the corrosion current will stop flowing and the corrosion will stop. Therefore, it is common practice to attach a galvanic anode to the wetted stationary body of an underwater rotating machine, for example, to the outer surface of the head cover, etc., and to prevent corrosion of the stationary body by passing an anticorrosion current over the entire electrically connected stationary body. It is being appreciated.
【０００３】しかしながら水中電動ポンプや曝気・攪拌
装置など、水中回転機械の回転主軸はボールベアリング
などの軸受により支承され、軸受の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、回転主軸の回転時には内
外輪とボールとの接触部分に絶縁油膜が形成され、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、流電陽極からの防食電流が回転体部分へ流入でき
ず、静止体部分との電位差によって回転主軸に腐食を生
じることは避けられない。However, a rotating main shaft of an underwater rotating machine such as an underwater electric pump or an aeration / agitation device is supported by a bearing such as a ball bearing, and a gap between the facing surfaces of the inner and outer rings of the bearing is filled with lubricating grease. Since the grease is non-conductive, an insulating oil film is formed on the contact part between the inner and outer rings and the balls when the main spindle rotates, and the bearing inner ring and the rotating body part connected to it and the bearing outer ring and the stationary body part connected to it. Is completely insulated, the anticorrosion current from the galvanic anode cannot flow into the rotating body portion, and it is unavoidable that the rotating spindle is corroded due to the potential difference from the stationary body portion.
【０００４】電動機部が陸上へ設置され回転主軸の一部
が気中に露出してる軸流や斜流の大型ポンプであれば、
図６に見られるよう上記回転主軸１０１の気中露出部に
直接摺動ブラシ１０８を摺接させることで、電気的な繋
がりを確保して回転主軸１０１の腐食を防止することが
可能となる。しかし水中電動ポンプ等の水中回転機械で
は電動機部が完全に水没するため、摺動ブラシを電動機
内部へ装着することになる。具体的には図７に示すよ
う、ヘッドカバー２１１の裏面に基部を定着させた摺動
ブラシ２０８の先端部が回転主軸２０１の反負荷側導出
部へ摺接するという構造である。このような従来の構造
では、摺動ブラシ２０８の摩耗粉が電動機の回転子２１
２と固定子２１３との間隙部や反負荷側軸受２１４内に
入り込んで電動機に障害を及ぼすことになる。そしてメ
ンテナンス時には電動機内部を開放して実施することに
なり、高度な技術が要求されるものであるため整備工場
へ持込んでの修理やメンテナンスが必要で、ポンプ使用
現場において簡単にメンテナンスできるものではない。In the case of a large axial flow or oblique flow pump in which the electric motor section is installed on land and a part of the rotating main shaft is exposed to the air,
As shown in FIG. 6, the sliding brush 108 is brought into direct sliding contact with the exposed portion of the rotary spindle 101 in the air, whereby electrical connection can be secured and corrosion of the rotary spindle 101 can be prevented. However, in an underwater rotating machine such as an underwater electric pump, the electric motor part is completely submerged in water, so that the sliding brush is mounted inside the electric motor. Specifically, as shown in FIG. 7, the structure is such that the tip of the sliding brush 208, whose base is fixed to the back surface of the head cover 211, is in sliding contact with the anti-load side outlet of the rotary spindle 201. In such a conventional structure, the abrasion powder of the sliding brush 208 causes the rotor 21 of the electric motor to be damaged.
2 enters the gap between the stator 2 and the stator 213 or into the anti-load side bearing 214, and causes an obstacle to the electric motor. When performing maintenance, the inside of the motor will be opened, and since high-level technology is required, it is necessary to bring it to a maintenance shop for repair and maintenance. Absent.
【０００５】[0005]
【発明の目的】本発明の目的は、部品点数を全く増加さ
せることなく、回転体部分と静止体部分との間に確実な
電気的導通性を与えて優れた電食防止効果が得られ、か
つ、構造簡潔でメンテナンス性にも優れた水中回転機械
の回転主軸防食装置を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a reliable electrical continuity between a rotating body portion and a stationary body portion without any increase in the number of parts, thereby obtaining an excellent electrolytic corrosion preventing effect. Another object of the present invention is to provide a rotary spindle anticorrosion device for an underwater rotating machine, which has a simple structure and is excellent in maintainability.
【０００６】[0006]
【発明の構成】本発明に係る水中回転機械の回転主軸防
食装置では、回転主軸の導出部外周とハウジングの軸孔
周辺部との間に介装されて内部空間と外部空間とを仕切
る弾性シール材が、導電性のゴムや樹脂もしくはそれら
の複合材料で構成されており、回転主軸およびそれに連
なる回転体部分とハウジングおよびそれに連なる静止体
部分とが、上記シール材を介して電気的に導通している
ことを特徴とする。そして弾性シール材介装の具体的態
様として、ハウジングの軸孔周辺部へ定着させてそのリ
ップ先端部が、回転主軸またはその保護スリーブの外周
面に摺接するよう構成する。また、弾性シール材介装の
他の具体的態様として、ハウジングの軸孔周辺部へ定着
させてそのリップ先端部が、回転体のボス部外周面また
は後端面へ摺接するよう構成する。また、弾性シール材
介装の他の具体的態様として、ハウジングの軸孔周辺部
の環状溝に嵌着させてその内周面が、回転主軸またはそ
の保護スリーブの外周面へ摺接するよう構成する。ま
た、弾性シール材介装の他の具体的態様として、回転主
軸の外周面または回転体のボス部に定着させてそのリッ
プ先端部が、ハウジングの軸孔周辺部へ摺接するよう構
成する。In the rotary spindle anticorrosion device for an underwater rotating machine according to the present invention, an elastic seal is provided between the outer periphery of the lead-out portion of the rotary spindle and the peripheral portion of the shaft hole of the housing to partition the internal space and the external space. The material is made of conductive rubber or resin or a composite material thereof, and the rotating main shaft and the rotating body portion connected to it and the housing and the stationary body portion connected to it are electrically connected to each other through the sealing material. It is characterized by As a specific mode of the elastic seal material, the elastic seal material is fixed to the peripheral portion of the shaft hole of the housing so that its lip tip portion is in sliding contact with the outer peripheral surface of the rotary spindle or its protective sleeve. Further, as another specific mode of the elastic sealant interposition, the elastic sealant is fixed to the peripheral portion of the shaft hole of the housing so that the tip end of the lip is in sliding contact with the outer peripheral surface or the rear end surface of the boss portion of the rotating body. Further, as another specific mode of the elastic seal member interposition, the elastic seal member is fitted in an annular groove in the peripheral portion of the shaft hole of the housing so that the inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the rotary spindle or its protective sleeve. . Further, as another specific mode of the elastic seal member interposition, the elastic seal member is fixed on the outer peripheral surface of the rotary main shaft or the boss portion of the rotary body so that the tip end of the lip is in sliding contact with the peripheral portion of the shaft hole of the housing.
【０００７】[0007]
【実施例】以下実施例の図1ないし図５により説明をす
る。１は、ステンレス鋼などの鉄材で作られた回転主軸
であり、ハウジング５の中央軸孔６を貫通して接液方向
へ導出される負荷側導出端には、羽根車等の回転体２が
装着されている。８は、回転体２の後方において回転主
軸１の負荷側導出部外周とハウジング５の軸孔６の周辺
部との間に介装されて内部空間Ａと外部空間Ｂとを仕切
る弾性シール材であり、導電性のゴムや樹脂もしくはそ
れらの複合材料で構成されている。なお、水中回転機械
の接液静止体、例えばヘッドカバー等にはアルミニウム
合金など電位の低い金属で作られた流電陽極（図示せ
ず）を装着する。EXAMPLES Examples will be described below with reference to FIGS. 1 to 5. Reference numeral 1 denotes a rotating main shaft made of an iron material such as stainless steel, and a rotating body 2 such as an impeller is provided at a load-side lead-out end that penetrates a central shaft hole 6 of a housing 5 and is led out in a liquid contact direction. It is installed. Reference numeral 8 denotes an elastic seal material which is interposed between the outer periphery of the load-side lead-out portion of the rotary main shaft 1 and the peripheral portion of the shaft hole 6 of the housing 5 at the rear of the rotary body 2 to partition the internal space A and the external space B. And is made of conductive rubber or resin or a composite material thereof. A galvanic anode (not shown) made of a metal having a low electric potential such as an aluminum alloy is mounted on a stationary body in contact with liquid of a submersible rotating machine, such as a head cover.
【０００８】弾性シール材８の介装態様の具体的例とし
ては、図１に示すよう、弾性シール材８をハウジング５
の軸孔６の周辺部へ定着させてそのリップ先端部が、回
転主軸１またはその保護スリーブ１ｓの外周面に摺接す
るよう構成し、或いは図２に示すよう、弾性シール材８
をハウジング５の軸孔６の周辺部へ定着させてそのリッ
プ先端部が、回転体１のボス部２ｂの外周面へ摺接し、
または図示はしないがボス部２ｂの後端面へ摺接するよ
う構成し、或いは図３に示すよう、弾性シール材８をハ
ウジング５の軸孔６の周辺部の環状溝４内へ嵌着させて
その内周面が、回転主軸１またはその保護スリーブ１ｓ
の外周面へ摺接するよう構成し、或いは図４に示すよ
う、弾性シール材８を回転主軸１の外周面に定着させて
そのリップ先端部が、ハウジング５の軸孔６の周辺部へ
摺接するよう構成し、或いは図５に示すよう、弾性シー
ル材８を回転体２のボス部２ｂに定着させてそのリップ
先端部が、ハウジング５の軸孔６の周辺部へ摺接するよ
う構成する。As a specific example of the manner of interposing the elastic seal material 8, as shown in FIG.
Is fixed to the peripheral portion of the shaft hole 6 so that the tip of the lip is in sliding contact with the outer peripheral surface of the rotating main shaft 1 or the protective sleeve 1s thereof, or as shown in FIG.
Is fixed to the peripheral portion of the shaft hole 6 of the housing 5, and its lip tip portion is in sliding contact with the outer peripheral surface of the boss portion 2b of the rotating body 1,
Alternatively, although not shown, the boss portion 2b is configured to be in sliding contact with the rear end surface, or, as shown in FIG. 3, the elastic seal member 8 is fitted into the annular groove 4 in the peripheral portion of the shaft hole 6 of the housing 5 and The inner peripheral surface is the rotating spindle 1 or its protective sleeve 1s.
4, or the elastic seal member 8 is fixed to the outer peripheral surface of the rotating main shaft 1 so that the lip tip of the elastic seal member 8 slides into the peripheral portion of the shaft hole 6 of the housing 5 as shown in FIG. Alternatively, or as shown in FIG. 5, the elastic seal member 8 is fixed to the boss portion 2b of the rotating body 2 so that the tip end of the lip is in sliding contact with the peripheral portion of the shaft hole 6 of the housing 5.
【０００９】[0009]
【作用】このようにして導電性を有する弾性シール材８
が介在することにより、水中回転機械の駆動中において
回転主軸１およびそれに連なる回転体部分と、ハウジン
グ５およびそれに連なる静止体部分との間に生じる電位
差を減少し、腐食電流が流れなくなると共に流電陽極の
溶出による腐食電流の流れが形成されて防食作用を生じ
ることになる。そして弾性シール材８の介装位置という
のが、本来オイルシールやダストシールなどが装着され
ていた場所であり、弾性シール材８が従来のオイルシー
ルやダストシールの役割をも兼ねることになる。The elastic seal material 8 having conductivity in this way
The interposition of V reduces the potential difference generated between the rotating main shaft 1 and the rotating body portion connected to it and the housing 5 and the stationary body portion connected to it while the underwater rotating machine is driven, and the corrosion current stops flowing and the galvanic current flows. A flow of a corrosion current is formed due to the elution of the anode, which causes a corrosion prevention effect. The position where the elastic seal material 8 is interposed is the place where the oil seal, the dust seal, etc. were originally mounted, and the elastic seal material 8 also serves as the conventional oil seal and dust seal.
【００１０】[0010]
【発明の効果】本発明装置によれば、水中電動ポンプな
ど水中回転機械の回転体部分と静止体部分との間に確実
な電気的導通性が与えられて回転主軸の優れた電食防止
効果が得られ、しかもそれらが何ら部品点数の増加を伴
うことなく体現せられ、かつ、メンテナンス時には電動
機内部を開放することを必要とせず、ポンプ等使用現場
において簡単にメンテナンスを実施し得るという利点が
ある。According to the apparatus of the present invention, reliable electrical continuity is provided between the rotating body portion and the stationary body portion of an underwater rotating machine such as an underwater electric pump, and an excellent effect of preventing electrolytic corrosion of the rotating spindle is provided. The advantages are that they can be embodied without any increase in the number of parts, and that it is not necessary to open the inside of the electric motor at the time of maintenance, and maintenance can be easily performed at the site of use such as a pump. is there.
【図１】 本発明防食装置を施した水中回転機械の要部
縦断側面図であって、弾性シール材をハウジングの軸孔
周辺部へ定着させてそのリップ先端部が、回転主軸の保
護スリーブの外周面に摺接するよう構成した事例を示
す。FIG. 1 is a vertical cross-sectional side view of a main part of an underwater rotating machine provided with an anticorrosion device of the present invention, in which an elastic seal material is fixed to a peripheral portion of a shaft hole of a housing, and a lip tip portion thereof is a protective sleeve of a rotating spindle. An example is shown in which the outer peripheral surface is in sliding contact.
【図２】 本発明防食装置を施した水中回転機械の要部
縦断側面図であって、弾性シール材をハウジングの軸孔
周辺部へ定着させてそのリップ先端部が、回転体のボス
部外周面へ摺接するよう構成した事例を示す。FIG. 2 is a vertical cross-sectional side view of a main part of an underwater rotating machine provided with an anticorrosion device of the present invention, in which an elastic sealing material is fixed to a peripheral portion of a shaft hole of a housing, and a lip tip portion thereof is an outer periphery of a boss portion of a rotating body. An example in which it is configured to slide on a surface is shown.
【図３】 本発明防食装置を施した水中回転機械の要部
縦断側面図であって、弾性シール材をハウジングの軸孔
周辺部の環状溝へ嵌着させてその内周面が、回転主軸の
保護スリーブの外周面へ摺接するよう構成した事例を示
す。FIG. 3 is a vertical sectional side view of a main part of an underwater rotating machine provided with an anticorrosion device of the present invention, in which an elastic sealing material is fitted into an annular groove around a shaft hole of a housing, and an inner peripheral surface thereof is a rotating main shaft. An example in which the protective sleeve is configured to be in sliding contact with the outer peripheral surface of the protective sleeve is shown.
【図４】 本発明防食装置を施した水中回転機械の要部
縦断側面図であって、弾性シール材を回転主軸の外周面
に定着させてそのリップ先端部が、ハウジングの軸孔周
辺部へ摺接するよう構成した事例を示す。FIG. 4 is a vertical cross-sectional side view of an essential part of an underwater rotating machine provided with an anticorrosion device of the present invention, in which an elastic seal material is fixed to an outer peripheral surface of a rotary spindle, and a lip tip portion thereof is directed to a peripheral portion of a shaft hole of a housing. An example in which it is configured to make sliding contact is shown.
【図５】 本発明防食装置を施した水中回転機械の要部
縦断側面図であって、弾性シール材を回転体のボス部に
定着させてそのリップ先端部が、ハウジングの軸孔周辺
部へ摺接するよう構成した事例を示す。FIG. 5 is a vertical cross-sectional side view of a main part of an underwater rotating machine provided with an anticorrosion device of the present invention, in which an elastic seal material is fixed to a boss portion of a rotating body, and a lip end portion thereof is directed to a peripheral portion of a shaft hole of a housing. An example in which it is configured to make sliding contact is shown.
【図６】 回転主軸の気中露出部に摺動ブラシを直接摺
接させた大型斜流ポンプの外側面図である。FIG. 6 is an outer side view of a large mixed flow pump in which a sliding brush is directly brought into sliding contact with an exposed part of the rotary spindle in the air.
【図７】 ヘッドカバーの裏面に基部を定着させた摺動
ブラシの先端部を回転主軸の反負荷側へ摺接させた水中
回転機械の要部縦断側面図である。FIG. 7 is a vertical cross-sectional side view of a main part of an underwater rotating machine in which a tip end portion of a sliding brush having a base portion fixed to a back surface of a head cover is brought into sliding contact with an anti-load side of a rotating spindle.
１ 回転主軸 １ｓ 保護スリーブ ２ 羽根車等の回転体 ４ 環状溝 ５ ハウジング ６ 軸孔 ８ 弾性シール材 Ａ 内部空間 Ｂ 外部空間 1 rotating spindle 1s protective sleeve 2 Rotators such as impellers 4 annular groove 5 housing 6 shaft holes 8 Elastic seal material A interior space B external space
Claims (5)
孔周辺部との間に介装されて内部空間と外部空間とを仕
切る弾性シール材が、導電性のゴムや樹脂もしくはそれ
らの複合材料で構成されており、回転主軸およびそれに
連なる回転体部分とハウジングおよびそれに連なる静止
体部分とが、上記シール材を介して電気的に導通してい
ることを特徴とする、水中回転機械の回転主軸防食装
置。1. An elastic seal material, which is interposed between the outer periphery of the lead-out portion of the rotary main shaft and the peripheral portion of the shaft hole of the housing to separate the internal space from the external space, is made of conductive rubber or resin or a composite material thereof. The rotating main shaft of a submersible rotating machine, characterized in that the rotating main shaft and the rotating body portion connected to it and the housing and the stationary body portion connected to it are electrically connected to each other through the sealing material. Anticorrosion device.
へ定着させてそのリップ先端部が、回転主軸またはその
保護スリーブの外周面に摺接するよう構成したことを特
徴とする、請求項１記載の水中回転機械の回転主軸防食
装置。2. The elastic seal member is fixed to the peripheral portion of the shaft hole of the housing, and the lip tip portion of the elastic seal member is in sliding contact with the outer peripheral surface of the rotary spindle or its protective sleeve. Anti-corrosion device for main spindle of underwater rotating machine.
へ定着させてそのリップ先端部が、回転体のボス部外周
面または後端面へ摺接するよう構成したことを特徴とす
る、請求項１記載の水中回転機械の回転主軸防食装置。3. An elastic sealing material is fixed to a peripheral portion of a shaft hole of a housing so that a lip tip portion of the elastic sealing material is in sliding contact with an outer peripheral surface or a rear end surface of a boss portion of a rotating body. A rotating spindle anticorrosion device for the underwater rotating machine described.
の環状溝に嵌着させてその内周面が、回転主軸またはそ
の保護スリーブの外周面へ摺接するよう構成したことを
特徴とする、請求項１記載の水中回転機械の回転主軸防
食装置。4. An elastic seal member is fitted in an annular groove around a shaft hole of a housing so that an inner peripheral surface thereof is in sliding contact with an outer peripheral surface of a rotary spindle or a protective sleeve thereof. The rotating spindle anticorrosion device for an underwater rotating machine according to claim 1.
回転体のボス部に定着させてそのリップ先端部が、ハウ
ジングの軸孔周辺部へ摺接するよう構成したことを特徴
とする、請求項１記載の水中回転機械の回転主軸防食装
置。5. An elastic sealing material is fixed to an outer peripheral surface of a rotary main shaft or a boss portion of a rotary body, and a lip tip end thereof is in sliding contact with a peripheral portion of a shaft hole of a housing. 1. A rotating spindle anticorrosion device for an underwater rotating machine according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001277973A JP4916067B2 (en) | 2001-09-13 | 2001-09-13 | Rotating spindle anticorrosion device for underwater rotating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001277973A JP4916067B2 (en) | 2001-09-13 | 2001-09-13 | Rotating spindle anticorrosion device for underwater rotating machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003083454A true JP2003083454A (en) | 2003-03-19 |
| JP4916067B2 JP4916067B2 (en) | 2012-04-11 |
Family
ID=19102418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001277973A Expired - Lifetime JP4916067B2 (en) | 2001-09-13 | 2001-09-13 | Rotating spindle anticorrosion device for underwater rotating machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4916067B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063574A (en) * | 2017-01-03 | 2017-08-18 | 浙江久立特材科技股份有限公司 | Multistation underwater airtightness testing machine |
| CN109499786A (en) * | 2018-12-17 | 2019-03-22 | 张家港市永达机械制造有限公司 | The main shaft of the automatic bag-pulling centrifuge of top suspension protects structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60245874A (en) * | 1984-05-22 | 1985-12-05 | Nok Corp | Conductive oil seal |
| JPS6348063A (en) * | 1986-08-15 | 1988-02-29 | Tokyo Electric Co Ltd | Facsimile equipment |
| JP2001107887A (en) * | 1999-10-12 | 2001-04-17 | Tsurumi Mfg Co Ltd | Electrocorrosion preventing structure of underwater pump or aeration/stirring device usig the same |
-
2001
- 2001-09-13 JP JP2001277973A patent/JP4916067B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60245874A (en) * | 1984-05-22 | 1985-12-05 | Nok Corp | Conductive oil seal |
| JPS6348063A (en) * | 1986-08-15 | 1988-02-29 | Tokyo Electric Co Ltd | Facsimile equipment |
| JP2001107887A (en) * | 1999-10-12 | 2001-04-17 | Tsurumi Mfg Co Ltd | Electrocorrosion preventing structure of underwater pump or aeration/stirring device usig the same |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063574A (en) * | 2017-01-03 | 2017-08-18 | 浙江久立特材科技股份有限公司 | Multistation underwater airtightness testing machine |
| CN107063574B (en) * | 2017-01-03 | 2023-09-15 | 浙江久立特材科技股份有限公司 | Multi-station underwater airtight testing machine |
| CN109499786A (en) * | 2018-12-17 | 2019-03-22 | 张家港市永达机械制造有限公司 | The main shaft of the automatic bag-pulling centrifuge of top suspension protects structure |
| CN109499786B (en) * | 2018-12-17 | 2023-10-03 | 张家港市永达机械制造有限公司 | Main shaft protection structure of upper suspension type automatic bag pulling centrifugal machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4916067B2 (en) | 2012-04-11 |
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