JPH1163243A - Lubricating oil holding device on sliding surface of shaft seal device in oil chamber of submergible pump - Google Patents
Lubricating oil holding device on sliding surface of shaft seal device in oil chamber of submergible pumpInfo
- Publication number
- JPH1163243A JPH1163243A JP22891497A JP22891497A JPH1163243A JP H1163243 A JPH1163243 A JP H1163243A JP 22891497 A JP22891497 A JP 22891497A JP 22891497 A JP22891497 A JP 22891497A JP H1163243 A JPH1163243 A JP H1163243A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- annular wall
- sliding surface
- lubricating oil
- chamber
- 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
Abstract
Description
【０００１】[0001]
【発明の技術分野】本発明は、水中ポンプ特に三相モー
タを用いた水中ポンプにおけるオイル室内軸封装置摺動
面の潤滑油保持装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil holding device for a sliding surface of an oil chamber shaft sealing device in a submersible pump, particularly a submersible pump using a three-phase motor.
【０００２】[0002]
【従来技術とその問題点】水中ポンプにおいてオイル室
内に封入する潤滑油量は、回転時における軸封装置の摺
動面の発熱やモータの発熱による膨張率を見込んで、一
般にオイル室全容積の８０％程度としてオイル室内の上
方部に空気留りを保有させている。2. Description of the Related Art The amount of lubricating oil sealed in an oil chamber in a submersible pump is generally determined by taking into account the heat generated on the sliding surface of the shaft seal device during rotation and the expansion rate due to the heat generated by the motor. An air trap is held in the upper part of the oil chamber at about 80%.
【０００３】しかしながら軸封装置の回転による遠心力
作用で、潤滑油はオイル室内周壁方向へ渦流状に押し付
けられて中央部に空気留りを生じ、肝心の軸封装置摺動
面を潤滑油が浸さなくなり、摺動面の潤滑と冷却機能が
損なわれることになる。However, due to the centrifugal force caused by the rotation of the shaft sealing device, the lubricating oil is pressed in a swirling manner toward the peripheral wall of the oil chamber to generate air trapping at the center, and the lubricating oil slides on the essential sliding surface of the shaft sealing device. It will not be immersed, and the lubrication and cooling function of the sliding surface will be impaired.
【０００４】遠心力によって潤滑油が渦流状に散逸する
ことを防止するため、図５および６に示すよう、軸封装
置１１′の外側を環状壁体１０′で囲繞してその内周面
軸方向に沿って邪魔板１０′ｐを垂直に縦設し、壁面の
要所にオイル流通用の丸孔１３′を穿設するということ
が行われている。しかしシールリング押圧用コイルスプ
リング９′の回転により、潤滑油と空気留り１５′の空
気とが垂直の邪魔板１０′ｐに衝突し環状壁体１０′内
で強制的に混合されて細かい気泡が発生し、油・気混合
状態となってフローティングシート５′とシールリング
６′との摺動面１２′に介入するため潤滑効果は減殺さ
れる。また、環状壁体１０′の壁面要所にオイル流通用
の丸孔１３′を穿設させた構造であるため、オイル室
３′内における環状壁体１０′の内側と外側との潤滑油
の流通作用が不円滑であり、これが前記油・気混合状態
と相まって摺動面１２′の冷却効率を著しく低下させる
結果となっている。In order to prevent the lubricating oil from escaping due to centrifugal force, as shown in FIGS. 5 and 6, the outside of a shaft sealing device 11 'is surrounded by an annular wall body 10' and its inner peripheral surface shaft is formed. The baffle plate 10'p is vertically installed along the direction, and a round hole 13 'for oil distribution is formed at a key point on the wall surface. However, the rotation of the coil spring 9 'for pressing the seal ring causes the lubricating oil and the air in the air trap 15' to collide with the vertical baffle plate 10'p and is forcibly mixed in the annular wall 10 'to produce fine bubbles. Is generated, and the oil-gas mixture state is established, so that the lubrication effect is reduced because the oil and air intervene on the sliding surface 12 'between the floating seat 5' and the seal ring 6 '. In addition, since a circular hole 13 'for oil distribution is formed at a key point on the wall surface of the annular wall 10', lubricating oil between the inside and the outside of the annular wall 10 'in the oil chamber 3' is formed. The flow action is not smooth, which, combined with the oil-gas mixture state, results in a significant decrease in the cooling efficiency of the sliding surface 12 '.
【０００５】[0005]
【発明の目的】本発明の目的は、水中ポンプにおけるオ
イル室内中央部から周壁方向への潤滑油の散逸を防止す
ると共に潤滑油中への空気の混合を生じさせることな
く、軸封装置摺動面の有効な潤滑と冷却作用が行われ、
三相モータの結線間違いにより逆回転する場合でも有効
に機能する潤滑油保持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 prevent the lubricating oil from escaping from the center of the oil chamber of the submersible pump in the direction of the peripheral wall, and to prevent the mixing of air into the lubricating oil without causing the sliding of the shaft sealing device. Effective lubrication and cooling of the surface
It is an object of the present invention to provide a lubricating oil holding device that functions effectively even when the three-phase motor reversely rotates due to incorrect connection.
【０００６】[0006]
【発明の構成】本発明に係る水中ポンプにおけるオイル
室内軸封装置摺動面の潤滑油保持装置では、モータ室と
ポンプ室との間に介在するオイル室内におけるダブル型
軸封装置の外側を環状壁体で囲繞し、該環状壁体の上縁
部を上部のフローティングシートとシールリングとの摺
動面よりも上方部においてモータ側ハウジングに接近さ
せ下端縁はポンプ側ハウジングに当接させ、ポンプ軸の
正回転方向に対向して上り勾配の傾斜面を有するガイド
ベーンと、ポンプ軸の逆回転方向に対向して上り勾配の
傾斜面を有するガイドベーンとを、環状壁体の上縁部内
周面において両ガイドベーンの上端部が互いに接近し、
環状壁体の下縁部内周面において両ガイドベーンの下端
部が離隔した態様により、環状壁体の内周面に沿って背
向状に定着させ、両ガイドベーンの背向面間において環
状壁体の下方部にオイルの流入口を開設し、環状壁体の
上端縁とモータ側ハウジングとの間に形成される間隙部
をオイルの流出口に形成した。The lubricating oil holding device for the sliding surface of the shaft sealing device in the oil chamber in the submersible pump according to the present invention has a double-type shaft sealing device in the oil chamber interposed between the motor chamber and the pump chamber. The upper edge of the annular wall is located closer to the motor-side housing above the sliding surface between the upper floating sheet and the seal ring, and the lower edge is in contact with the pump-side housing. A guide vane having an upwardly sloped surface facing the forward rotation direction of the shaft and a guide vane having an upwardly sloped surface facing the reverse rotation direction of the pump shaft. The upper ends of both guide vanes approach each other on the surface,
The lower ends of the two guide vanes are separated from each other on the inner peripheral surface of the lower edge of the annular wall so that the lower surface of the annular wall is fixed rearward along the inner peripheral surface of the annular wall. An oil inlet was opened at the lower part of the body, and a gap formed between the upper edge of the annular wall and the motor-side housing was formed at the oil outlet.
【０００７】[0007]
【作用】ポンプ軸の正回転時には、環状壁体内の潤滑油
が、ポンプ軸の正回転方向に対向して上り勾配の傾斜面
を有するガイドベーンに沿って押し上げられると共に、
環状壁体の外側におけるオイル室内の潤滑油が下部のオ
イル流入口から環状壁体内へ流入し、環状壁体内の潤滑
油は下部の摺動面および上部の摺動面を潤滑させると共
に両摺動面の発熱を吸収しつつ上部のオイル流出口から
環状壁体外側のオイル室内へ移動する。In the forward rotation of the pump shaft, the lubricating oil in the annular wall is pushed up along the guide vane having the upwardly inclined surface facing the forward rotation direction of the pump shaft.
The lubricating oil in the oil chamber outside the annular wall flows into the annular wall from the lower oil inlet, and the lubricating oil in the annular wall lubricates the lower sliding surface and the upper sliding surface and slides both. It moves from the upper oil outlet to the oil chamber outside the annular wall while absorbing the heat generated on the surface.
【０００８】ポンプ軸逆回転時には環状壁体内の潤滑油
が、ポンプ軸の逆回転方向に対向して上り勾配の傾斜面
を有するガイドベーンに沿って押し上げられると共に、
環状壁体の外側におけるオイル室内の潤滑油が下部のオ
イル流入口から環状壁体内へ流入し、環状壁体内の潤滑
油は下部の摺動面および上部の摺動面を潤滑させると共
に両摺動面の発熱を吸収しつつ上部のオイル流入口から
環状壁体外側のオイル室内へ移動する。During the reverse rotation of the pump shaft, the lubricating oil in the annular wall is pushed up along a guide vane having an upwardly inclined surface facing the reverse rotation direction of the pump shaft.
The lubricating oil in the oil chamber outside the annular wall flows into the annular wall from the lower oil inlet, and the lubricating oil in the annular wall lubricates the lower sliding surface and the upper sliding surface and slides both. It moves from the upper oil inlet to the oil chamber outside the annular wall while absorbing the heat generated on the surface.
【０００９】[0009]
【実施例】以下実施例の図面により説明をする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the drawings.
【００１０】１は三相モータを収容するモータ室、２は
羽根車を内装したポンプ室、３は両室１，２の間に介在
するオイル室、４はモータ室１から導出されオイル室３
内を貫通してポンプ室２内へ導入されるポンプ軸であっ
て、三相モータの結線状態により回転方向が正回転と逆
回転に切り換えられる。５ａはオイル室３内においてポ
ンプ軸４と遊合しモータ室側ハウジング１ｈに定着され
た上部フローティングシート、５ｂはオイル室３内にお
いてポンプ軸４と遊合しポンプ側ハウジング２ｈに定着
された下部フローティングシート、６ａは上部フローテ
ィングシート５ａと摺接する上部シールリング、６ｂは
下部フローティングシート５ｂと摺接する下部シールリ
ング、７ａは上部シールリング６ａを背面から支承する
ベローズ、７ｂは下部シールリング６ｂを背面から支承
するベローズ、８ａは上部シールリング６ａおよびベロ
ーズ７ａの外周に嵌着されて両者６ａ，７ａを一体に結
合させる上部リテーナ、８ｂは下部シールリング６ｂお
よびベローズ７ｂの外周に嵌着されて両者６ｂ，７ｂを
一体に結合させる下部リテーナ、９はシールリング押圧
用のコイルスプリングであって、上下シールリング６
ａ，６ｂの背向面間にそれぞれリテーナ８ａ，８ｂを介
して張設される。１０はオイル室３内において上述の構
成からなるダブル型軸封装置１１の外側を囲繞する環状
壁体であり、その上端縁を上部のフローティングシート
５ａとシールリング６ａとの摺動面１２ａよりも上方に
おいてモータ側ハウジング１ｈに接近させ、下端縁は下
部のフローティングシート５ｂとシールリング６ｂとの
摺動面１２ｂよりも下方においてポンプ側ハウジング２
ｈに接近させる。そしてポンプ軸４の正回転方向に対し
て上り勾配の傾斜面を有するガイドベーンＧ1と、ポン
プ軸４逆回転方向に対向して上り勾配の傾斜面を有する
ガイドベーンＧ2とを、環状壁体１０の上縁部内周面に
おいて両ガイドベーンＧ1，Ｇ2の上端部が互いに接近
し、環状壁体１０の下縁部内周面において両ガイドベー
ンＧ1，Ｇ2の下端部が離隔した態様により、環状壁体１
０の内周面に沿って両ガイドベーンＧ1，Ｇ2を背向状に
定着させる。環状壁体１０の下方部には、両ガイドベー
ンＧ1，Ｇ2の背向面間に位置してオイルの流入口１３ｂ
が開設されている。また、環状壁体１０の上端縁とモー
タ側ハウジング１ｈとの間に環状に形成された間隙部は
オイルの流出口１３ａとなる。1 is a motor chamber for accommodating a three-phase motor, 2 is a pump chamber containing an impeller, 3 is an oil chamber interposed between the two chambers 1 and 2, and 4 is an oil chamber 3 drawn out of the motor chamber 1.
A pump shaft that penetrates the inside of the pump chamber and is introduced into the pump chamber 2. The rotation direction is switched between forward rotation and reverse rotation depending on the connection state of the three-phase motor. Reference numeral 5a denotes an upper floating sheet which is loosely connected to the pump shaft 4 in the oil chamber 3 and is fixed to the motor chamber side housing 1h, and 5b is a lower floating sheet which is loosely connected to the pump shaft 4 in the oil chamber 3 and fixed to the pump side housing 2h. A floating seat, 6a is an upper seal ring slidingly contacting the upper floating sheet 5a, 6b is a lower seal ring slidingly contacting the lower floating sheet 5b, 7a is a bellows for supporting the upper seal ring 6a from the back, and 7b is a back seal for the lower seal ring 6b. The upper retainer 8a is fitted on the outer periphery of the upper seal ring 6a and the bellows 7a, and the upper retainer 8b is integrally fitted on the outer periphery of the lower seal ring 6b and the bellows 7b. Lower retainer for connecting 6b and 7b together, 9 is a seat A coil spring for ring pressing, the upper and lower seal ring 6
a, 6b are stretched between the back-facing surfaces via retainers 8a, 8b, respectively. Reference numeral 10 denotes an annular wall body surrounding the outside of the double-type shaft sealing device 11 having the above-described configuration in the oil chamber 3, and having an upper edge thereof closer to a sliding surface 12a between the upper floating sheet 5a and the seal ring 6a. The pump side housing 1h is made to approach the motor side housing 1h in the upper part, and the lower end edge is made lower than the sliding surface 12b between the lower floating sheet 5b and the seal ring 6b.
h. A guide vane G 1 having an upwardly inclined surface with respect to the forward rotation direction of the pump shaft 4 and a guide vane G 2 having an upwardly inclined surface facing the pump shaft 4 in the reverse rotation direction are formed by an annular wall. the upper end of the guide vane G 1, G 2 in the upper inner peripheral surface of the body 10 close to each other, the lower end portion of the guide vane G 1, G 2 in the lower edge portion inner peripheral surface of the annular wall 10 is spaced According to the embodiment, the annular wall 1
The two guide vanes G 1 , G 2 are fixed in a rearward direction along the inner peripheral surface of the zero. The lower portion of the annular wall 10, the guide vane G 1, located between the back facing surfaces of G 2 oil inlet 13b
Has been established. A gap formed annularly between the upper end edge of the annular wall body 10 and the motor-side housing 1h becomes an oil outlet 13a.
【００１１】オイル室３内には潤滑油が封入されるが、
その封入量はオイル室３の全容積の８０％程度とし、油
面１４上には空気留り１５が形成されている。A lubricating oil is sealed in the oil chamber 3,
The filling amount is about 80% of the total volume of the oil chamber 3, and an air trap 15 is formed on the oil surface 14.
【００１２】そしてポンプ軸４の正回転時には、環状壁
体１０内の潤滑油がガイドベーンＧ 1の上り勾配に沿っ
て押し上げられ、環状壁体１０の外側におけるオイル室
３内の潤滑油が下部のオイル流入口１３ｂから環状壁体
１０の内側へ流入し、環状壁体１０内側の潤滑油は下部
の摺動面１２ｂおよび上部の摺動面１２ａを潤滑させる
と共に両摺動面１２ａ，１２ｂに発生する摺動熱を吸収
しつつ上部のオイル流出口１３ａから環状壁体１０外側
のオイル室３内へ移送されるのであるが、下部のオイル
流入口１３ｂはガイドベーン１３ａ，１３ｂの背向面間
において環状壁体１０の下方部に開設されており、上部
のオイル流出口１３ａは環状壁体１０の最上端部におい
て環状に形成されているため、ガイドベーンＧ1の上り
勾配に沿った押し上げ作用と相まって上記潤滑油の循環
作用は極めて円滑に行われる。また、環状壁体１０の内
側面に従来のような垂直状の邪魔板を有しないため、油
・気混合を生ずることがなく、摺動面の潤滑と冷却効果
が気泡によって減殺されることはない。更にまた、上部
の流出口１３ａは上部の摺動面１２ａよりも上方部に位
置することになるので、環状壁体１０内側の潤滑油が上
記摺動面１２ａの潤滑と熱吸収作用を確実に果たしたう
えで環状壁体１０外側のオイル室３内へ移動する。When the pump shaft 4 rotates forward, the annular wall
The lubricating oil in the body 10 is the guide vane G 1Along the uphill slope of
Oil chamber on the outside of the annular wall body 10
3. The lubricating oil in 3 is transferred from the lower oil inlet 13b to the annular wall.
10 and the lubricating oil inside the annular wall 10
The upper sliding surface 12a and the upper sliding surface 12b
Also absorbs sliding heat generated on both sliding surfaces 12a, 12b
From the upper oil outlet 13a to the outside of the annular wall body 10
Is transferred into the oil chamber 3 of the
The inflow port 13b is between the back facing surfaces of the guide vanes 13a, 13b.
At the lower part of the annular wall body 10 and at the upper part
Oil outlet 13a is located at the uppermost end of the annular wall body 10.
The guide vane G1Uphill
Circulation of the above lubricating oil combined with the lifting action along the gradient
The operation takes place very smoothly. In addition, the inside of the annular wall body 10
Since there is no vertical baffle on the side as in the past, oil
・ Lubrication and cooling effect of sliding surface without air mixing
Is not attenuated by air bubbles. Furthermore, the upper part
Outlet 13a is located above the upper sliding surface 12a.
The lubricating oil inside the annular wall body 10
The lubrication and heat absorption of the sliding surface 12a is reliably performed.
Then, it moves into the oil chamber 3 outside the annular wall body 10.
【００１３】三相モータを使用した水中ポンプにおいて
は、しばしば結線の誤りによりポンプ軸が逆回転させら
れることがある。しかし本発明装置によれば、ポンプ軸
４の逆回転時には、環状壁体１０内の潤滑油がガイドベ
ーンＧ2の上り勾配に沿って押し上げられ、前述のポン
プ軸４が正回転時の場合と全く同様に潤滑と冷却作用が
行われる。In a submersible pump using a three-phase motor, the pump shaft is often reversely rotated due to incorrect connection. However, according to the present invention apparatus, when the reverse rotation of the pump shaft 4, the lubricating oil in the annular wall 10 is pushed up along the upward gradient of the guide vanes G 2, and when the pump shaft 4 of the aforementioned during forward rotation Exactly the same lubrication and cooling action takes place.
【００１４】[0014]
【発明の効果】本発明によれば、潤滑油と空気が垂直状
の邪魔板に衝突して混じり合う従来のものと異なり、気
泡を含まない潤滑油が軸封装置の摺動面に保持せられる
ため潤滑性に優れ、環状壁体内外の潤滑油の循環作用が
円滑に行われることと相まって吸熱冷却効果も大きいと
いう利点がある。そしてこの潤滑と冷却作用はポンプ軸
の正回転であると逆回転であるとに拘らず、有効に機能
する。According to the present invention, unlike the conventional lubricating oil in which the lubricating oil and the air collide with and mix with the vertical baffle plate, the lubricating oil containing no air bubbles is held on the sliding surface of the shaft sealing device. As a result, the lubricating properties are excellent, and the lubricating oil circulating inside and outside the annular wall is smoothly circulated. The lubrication and cooling functions effectively regardless of whether the pump shaft is rotating forward or backward.
【図１】本発明装置を施した水中ポンプのオイル室の縦
断側面図である。FIG. 1 is a vertical sectional side view of an oil chamber of a submersible pump provided with the device of the present invention.
【図２】本発明装置における環状壁体の平面図である。FIG. 2 is a plan view of an annular wall in the device of the present invention.
【図３】本発明装置における環状壁体の底面図である。FIG. 3 is a bottom view of the annular wall in the device of the present invention.
【図４】図２のＡ−Ａ線における縦断側面図である。FIG. 4 is a longitudinal sectional side view taken along line AA of FIG. 2;
【図５】従来の水中ポンプにおけるオイル室の縦断側面
図である。FIG. 5 is a vertical side view of an oil chamber in a conventional submersible pump.
【図６】従来の水中ポンプのオイル室内に装着される環
状壁の斜視図である。FIG. 6 is a perspective view of an annular wall mounted in an oil chamber of a conventional submersible pump.
１ モータ室 １ｈ モータ側ハウジング ２ ポンプ室 ２ｈ ポンプ側ハウジング ３ オイル室 ４ ポンプ軸 ５ａ 上部のフローティングシート ６ａ 上部のシールリング ６ｂ 下部のシールリング １０ 環状壁体 １１ ダブル型軸封装置 １２ａ 上部の摺動面 １３ａ オイル流出口 １３ｂ オイル流入口 Ｇ1 ガイドベーン Ｇ2 ガイドベーンDESCRIPTION OF SYMBOLS 1 Motor room 1h Motor side housing 2 Pump room 2h Pump side housing 3 Oil chamber 4 Pump shaft 5a Upper floating seat 6a Upper seal ring 6b Lower seal ring 10 Annular wall body 11 Double type shaft seal device 12a Upper slide surface 13a oil outlet 13b the oil inlet G 1 guide vane G 2 guide vanes
Claims (1)
ル室内におけるダブル型軸封装置の外側を環状壁体で囲
繞し、該環状壁体の上縁部を上部のフローティングシー
トとシールリングとの摺動面よりも上方部においてモー
タ側ハウジングに接近させ下端縁はポンプ側ハウジング
に当接させ、ポンプ軸の正回転方向に対向して上り勾配
の傾斜面を有するガイドベーンと、ポンプ軸の逆回転方
向に対向して上り勾配の傾斜面を有するガイドベーンと
を、環状壁体の上縁部内周面において両ガイドベーンの
上端部が互いに接近し、環状壁体の下縁部内周面におい
て両ガイドベーンの下端部が離隔した態様により、環状
壁体の内周面に沿って背向状に定着させ、両ガイドベー
ンの背向面間において環状壁体の下方部にオイルの流入
口を開設し、環状壁体の上端縁とモータ側ハウジングと
の間に形成される間隙部をオイルの流出口に形成したこ
とを特徴とする、水中ポンプにおけるオイル室内軸封装
置摺動面の潤滑油保持装置。An annular wall surrounds the outside of a double-type shaft sealing device in an oil chamber interposed between a motor chamber and a pump chamber, and an upper edge of the annular wall is provided with an upper floating seat and a seal ring. A guide vane having an uphill slope facing the forward rotation direction of the pump shaft, with the lower end edge abutting on the pump side housing at a position above the sliding surface of the pump shaft; A guide vane having an upwardly sloped surface facing in the reverse rotation direction, wherein upper ends of both guide vanes approach each other on an inner peripheral surface of an upper edge of the annular wall, and an inner peripheral surface of a lower edge of the annular wall is formed. In the embodiment, the lower ends of the two guide vanes are separated from each other, so that the lower ends of the two guide vanes are separated from each other along the inner peripheral surface of the annular wall. Establish a ring A gap portion formed between the upper edge and the motor housing body characterized by being formed on the outlet port of the oil, lubricant oil holding device oil chamber shaft sealing device sliding surface in water pumps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22891497A JP3850521B2 (en) | 1997-08-11 | 1997-08-11 | Lubricating oil retaining device for sliding surface of oil chamber shaft seal device in submersible pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22891497A JP3850521B2 (en) | 1997-08-11 | 1997-08-11 | Lubricating oil retaining device for sliding surface of oil chamber shaft seal device in submersible pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1163243A true JPH1163243A (en) | 1999-03-05 |
| JP3850521B2 JP3850521B2 (en) | 2006-11-29 |
Family
ID=16883840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22891497A Expired - Lifetime JP3850521B2 (en) | 1997-08-11 | 1997-08-11 | Lubricating oil retaining device for sliding surface of oil chamber shaft seal device in submersible pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3850521B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6641140B1 (en) * | 2000-07-19 | 2003-11-04 | Tsurumi Manufacturing Co., Ltd. | Apparatus for retaining lubrication oil at sliding surface of shaft seal device disposed within oil chamber of submersible pump |
| CN1318762C (en) * | 2006-03-31 | 2007-05-30 | 浙江水泵总厂有限公司 | High temperature high pressure hot-water circulating pump |
| CN114352727A (en) * | 2020-10-13 | 2022-04-15 | 化大兰天密封技术（天津）有限公司 | Mechanical sealing device for polymer reaction kettle |
-
1997
- 1997-08-11 JP JP22891497A patent/JP3850521B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6641140B1 (en) * | 2000-07-19 | 2003-11-04 | Tsurumi Manufacturing Co., Ltd. | Apparatus for retaining lubrication oil at sliding surface of shaft seal device disposed within oil chamber of submersible pump |
| CN1318762C (en) * | 2006-03-31 | 2007-05-30 | 浙江水泵总厂有限公司 | High temperature high pressure hot-water circulating pump |
| CN114352727A (en) * | 2020-10-13 | 2022-04-15 | 化大兰天密封技术（天津）有限公司 | Mechanical sealing device for polymer reaction kettle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3850521B2 (en) | 2006-11-29 |
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