JPH0742849A - Floating bush seal and its manufacture - Google Patents

Floating bush seal and its manufacture

Info

Publication number
JPH0742849A
JPH0742849A JP20682293A JP20682293A JPH0742849A JP H0742849 A JPH0742849 A JP H0742849A JP 20682293 A JP20682293 A JP 20682293A JP 20682293 A JP20682293 A JP 20682293A JP H0742849 A JPH0742849 A JP H0742849A
Authority
JP
Japan
Prior art keywords
sliding member
peripheral surface
annular sliding
thermal expansion
metal ring
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.)
Pending
Application number
JP20682293A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Kojima
一義 小島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eagle Industry Co Ltd
Original Assignee
Eagle Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eagle Industry Co Ltd filed Critical Eagle Industry Co Ltd
Priority to JP20682293A priority Critical patent/JPH0742849A/en
Publication of JPH0742849A publication Critical patent/JPH0742849A/en
Pending legal-status Critical Current

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  • Mechanical Sealing (AREA)

Abstract

PURPOSE:To keep minute the gap between the inside surface of a ring-shaped slide material and the outside surface of a rotor such as a shaft sleeve and to prevent the slide material from touching the rotor because of their difference in thermal expansion. CONSTITUTION:On the housing 1 side, a ring-shaped slide material 51 is supported in non-rotatable state, whose butting surface 51a at one end in axial direction is tightly butted to the end face 16a on the housing 1 side in such a way as movable in the radial direction and whose inside surface 51c confronts the outside surface 21a of a rotor 21 with a minute gap interposed, and a metal ring 54 having a larger coefficient of thermal expansion than the slide material 51 is fitted thereon by means of hot fitting. Thereby the slide material 51 is given a diametrically contractive strain. and thereby the material 51 is diametrically enlarged or contracted in compliance with the thermal expansion and contraction of the rotor 21 with varying fastening force of the metal ring 54 owing to the temp. change at the time of operation.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えばメカニカルシー
ル等のクエンチング用のシール手段として用いられるフ
ローティングブッシュシールに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating bush seal used as a quenching sealing means such as a mechanical seal.

【0002】[0002]

【従来の技術】図3は、クエンチング用のシール手段と
してフローティングブッシュシールを用いた軸封装置の
典型的な従来例を示すもので、図中符号1は機体の軸封
部ハウジング、2はこのハウジング1の内周に挿通され
た回転軸、3はハウジング1と回転軸2の間に介在され
たメカニカルシール、4はフローティングブッシュシー
ルである。このメカニカルシール3は、回転軸2のスリ
ーブ21のフランジ部21aに気密的に固定されて回転
軸2と共に回転するメイティングリング31と、ハウジ
ング1の内径フランジ部11に金属ベローズ33を介し
て軸方向移動自在かつ非回転状態に支持されたシールリ
ング32とを備えており、この静止側のシールリング3
2と、回転側のメイティングリング31が、互いに軸方
向に対向する端面同士で密接摺動することによって、密
封対象液が充満する密封空間Sを密封するものである。
2. Description of the Related Art FIG. 3 shows a typical conventional example of a shaft sealing device using a floating bush seal as a sealing means for quenching. A rotary shaft 3 is inserted through the inner circumference of the housing 1, a mechanical seal 3 is interposed between the housing 1 and the rotary shaft 2, and a floating bush seal 4 is provided. The mechanical seal 3 includes a mating ring 31 which is airtightly fixed to the flange portion 21a of the sleeve 21 of the rotary shaft 2 and rotates together with the rotary shaft 2, and a shaft of the inner ring flange portion 11 of the housing 1 via a metal bellows 33. The stationary seal ring 3 is provided with
2 and the mating ring 31 on the rotation side closely contact with each other at the end faces axially opposed to each other, thereby sealing the sealed space S filled with the liquid to be sealed.

【0003】ハウジング1には、フラッシング孔12
と、クエンチング孔13と、ドレン孔14がそれぞれ開
設されている。フラッシング孔12は、メカニカルシー
ル3の外周側に達する密封空間Sに密封対象液を注入・
排出することによってこの密封対象液をメカニカルシー
ル3の外周に沿って流通させ、メイティングリング31
とシールリング32の摺動部近傍を密封空間S側から冷
却及び洗浄するフラッシングを行うためのものである。
クエンチング孔13は、ハウジング1の内周における反
密封空間(密封空間Sと反対側の空間)に液体もしくは
蒸気等のクエンチング流体を注入することによって、前
記摺動部近傍の冷却、保温及び洗浄等を行うためのもの
である。
The housing 1 has a flushing hole 12
, A quenching hole 13 and a drain hole 14 are provided respectively. The flushing hole 12 injects the liquid to be sealed into the sealed space S reaching the outer peripheral side of the mechanical seal 3.
By discharging, the liquid to be sealed is circulated along the outer periphery of the mechanical seal 3, and the mating ring 31
And flushing for cooling and cleaning the vicinity of the sliding portion of the seal ring 32 from the sealed space S side.
The quenching hole 13 injects a quenching fluid such as liquid or vapor into an anti-sealing space (a space on the opposite side of the sealing space S) in the inner circumference of the housing 1 to cool, keep warm, and maintain the vicinity of the sliding portion. It is for cleaning and the like.

【0004】クエンチング流体は、ハウジング1の内径
フランジ部11から金属ベローズ33及びシールリング
32の内周を軸方向に延在されたバッフルスリーブ15
によって、メイティングリング31とシールリング32
の摺動部の内周空間に導入され、そこからバッフルスリ
ーブ34の内周隙間を通って、ドレン孔14から排出さ
れるもので、特に、密封空間S内の密封対象流体が発火
しやすい性質を有する場合に、メカニカルシール3と大
気Aとの間を遮断して、前記摺動部から漏洩した流体の
引火を防止し、また、前記密封対象流体が大気Aとの接
触によって固化しやすいものである場合は、前記摺動部
から滲み出て漏洩した流体を洗い流して固化物による摺
動部の摩耗等を防止するのに有効である。なお、ドレン
孔14はハウジング1の上部に位置して図示されている
が、実機においては、排出を円滑になすため、ハウジン
グ1の下部に開設される。
The quenching fluid is a baffle sleeve 15 axially extending from the inner diameter flange portion 11 of the housing 1 to the inner circumferences of the metal bellows 33 and the seal ring 32.
By mating ring 31 and seal ring 32
Is introduced into the inner peripheral space of the sliding portion of the baffle sleeve 34 and discharged from the drain hole 14 through the inner peripheral gap of the baffle sleeve 34. Particularly, the fluid to be sealed in the sealed space S is easily ignited. In the case of having the following, the mechanical seal 3 and the atmosphere A are shut off to prevent the fluid leaking from the sliding portion from catching fire, and the fluid to be sealed easily solidifies due to contact with the atmosphere A. In this case, it is effective to wash away the fluid that has exuded and leaked from the sliding portion to prevent abrasion of the sliding portion due to solidification. Although the drain hole 14 is shown in the upper part of the housing 1 in the figure, it is opened in the lower part of the housing 1 in the actual machine in order to facilitate the discharge.

【0005】フローティングブッシュシール4は、ハウ
ジング1の外側端部に気密的に固定されたフランジカバ
ー16の内側の端面16aと当接状態に配置されたカー
ボンあるいは四フッ化エチレン等からなる環状摺動材4
1と、この環状摺動材41を前記フランジカバー16の
端面16aに押し付けるために円周方向等間隔で複数個
配置されたコイルスプリング42とを有する。環状摺動
材41は、その衝合端面41aに形成された係合穴41
bが、フランジカバー16の端面16aに突設されたピ
ン43に遊嵌されることによって非回転状態に保持され
ると共に、前記端面16aに半径方向移動自在に密接衝
合され、内周面41cが回転軸2のスリーブ21の外周
面に半径方向の幅が0.1〜0.3mm程度の微小な隙
間を介して嵌め込まれている。
The floating bush seal 4 is an annular slide made of carbon or ethylene tetrafluoride, which is placed in contact with the inner end surface 16a of the flange cover 16 which is hermetically fixed to the outer end of the housing 1. Material 4
1 and a plurality of coil springs 42 arranged at equal intervals in the circumferential direction to press the annular sliding member 41 against the end surface 16a of the flange cover 16. The annular sliding member 41 has an engaging hole 41 formed in its abutting end surface 41a.
b is loosely fitted to a pin 43 projecting from the end face 16a of the flange cover 16 so as to be held in a non-rotating state, and is closely abutted on the end face 16a so as to be movable in the radial direction. Is fitted into the outer peripheral surface of the sleeve 21 of the rotary shaft 2 through a minute gap having a radial width of about 0.1 to 0.3 mm.

【0006】すなわちフローティングブッシュシール4
は、環状摺動材41の内周面とスリーブ21の外周面の
間の隙間が微小に設定されると共に、衝合端面41aが
フランジカバー16の端面16aと密接衝合することに
よって、軸周からハウジング1(フランジカバー16)
の外側へクエンチング流体が流出するのを阻止し、これ
によって、図示しない軸受部等の周辺機器にクエンチン
グ流体が侵入することによる不具合を防止するものであ
る。環状摺動材41は、回転時における回転軸2の偏心
運動等に追随して半径方向に浮動可能であることによっ
て、この環状摺動材41の内周面41cの摩耗が抑えら
れるので、スリーブ21との間の微小隙間が維持され、
密封性が良好に保たれる。
That is, the floating bush seal 4
The gap between the inner peripheral surface of the annular sliding member 41 and the outer peripheral surface of the sleeve 21 is set to be small, and the abutting end surface 41a closely abuts against the end surface 16a of the flange cover 16 so that the axial circumference is reduced. To housing 1 (flange cover 16)
The quenching fluid is prevented from flowing out to the outside, thereby preventing a problem caused by the quenching fluid entering the peripheral equipment such as a bearing (not shown). The annular sliding member 41 is capable of floating in the radial direction following the eccentric movement of the rotating shaft 2 during rotation, so that wear of the inner peripheral surface 41c of the annular sliding member 41 is suppressed, and thus the sleeve. 21 maintains a very small gap,
Good sealing performance is maintained.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記従
来のフローティングブッシュシール4には、次のような
問題が指摘される。すなわち、金属からなるスリーブ2
1及び回転軸2の熱膨張率は、カーボン等からなる環状
摺動材41の約3倍であるため、機器の起動・停止によ
る温度変化あるいは運転中の雰囲気温度の変化によっ
て、スリーブ21と環状摺動材41に熱膨張差を生じ、
両者間の隙間の大きさが変化する。特に、温度上昇によ
ってスリーブ21が拡径され、環状摺動材41の内周面
41cが回転中のスリーブ21に抱き付き状態に接触す
ると、カーボンからなるこの環状摺動材41は引っ張り
強度が小さいため、スリーブ21からの拡径力により破
壊されて飛散してしまうことがある。また、このような
接触を防止するために、予めスリーブ21と環状摺動材
41の対向周面間の隙間を大きくすると、低温時の漏れ
量が増大してしまい、良好な密封性能が期待できない。
However, the following problems are pointed out with the conventional floating bush seal 4 described above. That is, the sleeve 2 made of metal
Since the coefficient of thermal expansion of the rotary shaft 1 and the rotary shaft 2 is about three times that of the annular sliding member 41 made of carbon or the like, the sleeve 21 and the annular member 21 are annular due to a temperature change due to start / stop of equipment or a change in ambient temperature during operation. A difference in thermal expansion occurs in the sliding member 41,
The size of the gap between the two changes. In particular, when the sleeve 21 is expanded in diameter due to a temperature rise and the inner peripheral surface 41c of the annular sliding member 41 comes into contact with the rotating sleeve 21 in a clinging state, the annular sliding member 41 made of carbon has a small tensile strength. Therefore, it may be broken and scattered by the expanding force from the sleeve 21. If the gap between the sleeve 21 and the opposing peripheral surface of the annular sliding member 41 is increased in advance in order to prevent such contact, the amount of leakage at low temperatures increases, and good sealing performance cannot be expected. .

【0008】したがって、本発明の主な目的は、フロー
ティングブッシュシールにおける環状摺動材の内周面
と、軸スリーブ等の回転体外周面との間の隙間を微小に
保つと共に、環状摺動材と回転体の熱膨張差による接触
を防止することにある。
Therefore, the main object of the present invention is to keep a small gap between the inner peripheral surface of the annular sliding member in the floating bush seal and the outer peripheral surface of the rotating body such as the shaft sleeve, and to make the annular sliding member smaller. And to prevent contact due to the difference in thermal expansion of the rotating body.

【0009】[0009]

【課題を解決するための手段】上述した技術的課題は、
本発明によって有効に解決することができる。すなわち
本発明に係るフローティングブッシュシールは、ハウジ
ング側に非回転状態に支持され、軸方向一端の衝合面が
前記ハウジング側の端面に半径方向移動自在に密接衝合
されると共に、内周面が回転体の外周面に微小隙間を介
して対向された環状摺動材が、その外周面に適当な締め
付け力で嵌着され前記環状摺動材よりも熱膨張率の大き
い金属リングで縮径歪を加えられたものである。また、
本発明に係るフローティングブッシュシールの製造方法
は、環状に成形した摺動材の外周面にこの摺動材よりも
熱膨張率の大きい金属リングを焼き嵌めしてこの摺動材
に縮径歪を加えた後で、前記摺動材の内周面を所定の内
径に仕上加工するものである。
The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, the floating bush seal according to the present invention is supported in a non-rotating state on the housing side, the abutment surface at one axial end is abutted against the end surface on the housing side so as to be movable in the radial direction, and the inner peripheral surface is An annular sliding member, which is opposed to the outer peripheral surface of the rotating body through a minute gap, is fitted to the outer peripheral surface with an appropriate tightening force and has a diameter reduction strain due to a metal ring having a larger coefficient of thermal expansion than the annular sliding member. Is added. Also,
A method for manufacturing a floating bush seal according to the present invention is such that a metal ring having a coefficient of thermal expansion larger than that of a sliding member is shrink-fitted on the outer peripheral surface of a sliding member formed in an annular shape to reduce the radial strain. After the addition, the inner peripheral surface of the sliding member is finished into a predetermined inner diameter.

【0010】[0010]

【作用】環状摺動材に対する金属リングの締め付け力
は、この金属リングを環状摺動材の外周面に焼き嵌めす
ることによって与えられ、その後前記環状摺動材の内周
面を所定の内径に仕上加工することによって、回転体外
周面との間の半径方向隙間が微小に設定される。そし
て、機器の運転時等の温度変化による環状摺動材の半径
方向の膨張・収縮幅が、熱膨張・収縮の大きい金属リン
グの締め付け力の変化によって増幅されるので、その内
周面が回転体の半径方向の熱膨張・収縮に対応して拡径
・縮径し、回転体と環状摺動材の熱膨張差による両者間
の半径方向隙間の大きさの変化が抑制される。また、金
属リングは、万一環状摺動材が破壊された時の飛散を、
外周からの結束作用によって阻止する。
The tightening force of the metal ring on the annular sliding member is given by shrink-fitting the metal ring on the outer peripheral surface of the annular sliding member, and then the inner peripheral surface of the annular sliding member is made to have a predetermined inner diameter. By finishing, the radial gap with the outer peripheral surface of the rotating body is set to be minute. The radial expansion / contraction width of the annular sliding member due to temperature changes during operation of the equipment is amplified by changes in the tightening force of the metal ring, which has large thermal expansion / contraction, so that the inner peripheral surface rotates. The diameter is expanded / contracted in accordance with the thermal expansion / contraction of the body in the radial direction, and the change in the size of the radial gap between the rotating body and the annular sliding member due to the difference in thermal expansion is suppressed. In addition, the metal ring prevents scattering when the annular sliding material is broken.
It is blocked by the binding action from the outer circumference.

【0011】[0011]

【実施例】図1は、クエンチング用のシール手段として
本発明の一実施例のフローティングブッシュシール5を
用いた軸封装置を示すものである。なお、この図1にお
いて、ハウジング1、回転軸2、メカニカルシール3な
どは、図3の従来例に示されたものと同一であるため、
その説明は省略する。
FIG. 1 shows a shaft sealing device using a floating bush seal 5 according to an embodiment of the present invention as a sealing means for quenching. Note that, in FIG. 1, the housing 1, the rotary shaft 2, the mechanical seal 3, and the like are the same as those shown in the conventional example of FIG.
The description is omitted.

【0012】フローティングブッシュシール5は、フラ
ンジカバー16の内側の端面16aと当接状態に配置さ
れたカーボンからなる環状摺動材51と、この環状摺動
材51を前記フランジカバー16の端面16aに押し付
けるために円周方向等間隔で複数個配置されたコイルス
プリング52とを有する。環状摺動材51は、その衝合
端面51aに形成された係合穴51bが、フランジカバ
ー16の端面16aに突設されたピン53に遊嵌される
ことによって非回転状態に保持されると共に、前記端面
16aに半径方向移動自在に密接衝合され、内周面51
cが、回転軸2のスリーブ21の外周面に微小な隙間を
介して対向されている。図2にも示すように、環状摺動
材51の外周面には金属リング54が嵌着されている。
なお、51dは環状摺動材51の内周面51cに形成さ
れた溝である。
The floating bush seal 5 has an annular sliding member 51 made of carbon, which is arranged in contact with the inner end surface 16a of the flange cover 16, and the annular sliding member 51 on the end surface 16a of the flange cover 16. A plurality of coil springs 52 are arranged at equal intervals in the circumferential direction for pressing. The annular sliding member 51 is held in a non-rotating state by the engagement hole 51b formed in the abutting end surface 51a being loosely fitted into the pin 53 protruding from the end surface 16a of the flange cover 16. , The inner peripheral surface 51 is abutted against the end surface 16a so as to be movable in the radial direction.
c is opposed to the outer peripheral surface of the sleeve 21 of the rotary shaft 2 with a minute gap. As shown in FIG. 2, a metal ring 54 is fitted on the outer peripheral surface of the annular sliding member 51.
Incidentally, 51d is a groove formed on the inner peripheral surface 51c of the annular sliding member 51.

【0013】金属リング54は、カーボン製環状摺動材
51よりも熱膨張率が大きく、好ましくはスリーブ21
とほぼ同等の熱膨張率を有するもので、例えばステンレ
ス鋼からなり、環状摺動材51の外周面に焼き嵌めによ
って嵌着される。すなわち、金属リング54の内径は、
常温では環状摺動材51の外径よりも僅かに小径に設定
されており、この金属リング54を加熱膨張させた状態
で嵌め込んだ後、常温に冷却して収縮させることによっ
て、環状摺動材51を外周から締め付けた状態になるた
め、環状摺動材51には、金属リング54の締め付け力
による縮径歪が加えられる。また、環状摺動材51の内
周面51cは、この金属リング54の焼き嵌め後に、ス
リーブ21の外径よりも半径が0.1〜0.3mm程度
大きくなるように、規定寸法に仕上加工される。
The metal ring 54 has a coefficient of thermal expansion larger than that of the carbon annular sliding member 51, and is preferably the sleeve 21.
It has a coefficient of thermal expansion almost equal to, and is made of, for example, stainless steel, and is fitted onto the outer peripheral surface of the annular sliding member 51 by shrink fitting. That is, the inner diameter of the metal ring 54 is
At a room temperature, the diameter is set to be slightly smaller than the outer diameter of the annular sliding member 51. The metal ring 54 is fitted in a state of being heated and expanded, then cooled to a room temperature and contracted, so that the annular sliding is performed. Since the material 51 is tightened from the outer circumference, the annular sliding material 51 is subjected to a diameter reducing strain due to the tightening force of the metal ring 54. Further, the inner peripheral surface 51c of the annular sliding member 51 is finished to a specified dimension so that the radius becomes larger than the outer diameter of the sleeve 21 by about 0.1 to 0.3 mm after the metal ring 54 is shrink-fitted. To be done.

【0014】図1に示す装着状態において、機器を運転
(回転軸2を回転)することによって温度が上昇する
と、回転体である回転軸2及びこれと一体回転するスリ
ーブ21は熱膨張して拡径される。一方、環状摺動材5
1の外周面に嵌着された金属リング54も熱膨張して拡
径され、その締め付け力が減少するので、環状摺動材5
1は、縮径歪に対抗する応力によって、そのカーボン自
体の熱膨張のみによる拡径幅に比較して顕著に拡径され
る。このため、スリーブ21の外周面21aが熱膨張に
よって拡径されても、これに対応するように、環状摺動
材51の内周面51cも拡径されるので、両周面21
a,51c間の半径方向の隙間がほぼ初期の大きさを保
ち、スリーブ21と環状摺動材51の熱膨張率の差によ
る抱き付き接触が有効に防止される。
In the mounted state shown in FIG. 1, when the temperature rises by operating the device (rotating the rotating shaft 2), the rotating shaft 2 which is the rotating body and the sleeve 21 which rotates integrally with the rotating body 2 are thermally expanded and expanded. Diameter. On the other hand, the annular sliding member 5
Since the metal ring 54 fitted to the outer peripheral surface of 1 also expands due to thermal expansion and its tightening force decreases, the annular sliding member 5
No. 1 is remarkably expanded in diameter as compared with the expanded diameter width due to only the thermal expansion of the carbon itself due to the stress against the contraction strain. For this reason, even if the outer peripheral surface 21a of the sleeve 21 is expanded in diameter by thermal expansion, the inner peripheral surface 51c of the annular sliding member 51 is also expanded in diameter correspondingly, so that both peripheral surfaces 21
The radial gap between a and 51c maintains the initial size, and hugging contact due to the difference in thermal expansion coefficient between the sleeve 21 and the annular sliding member 51 is effectively prevented.

【0015】また、機器の停止等によって温度が低下し
ても、環状摺動材51は、金属リング54の収縮による
締め付け力の増大を受けて強制的に縮径されるので、ス
リーブ21の外周面21aとの半径方向の隙間の拡大が
有効に抑えられる。したがって、クエンチング孔13か
らメカニカルシール3のメイティングリング31とシー
ルリング32の摺動部の内周を通ってドレン孔14へ向
けて送られるクエンチング流体の、大気A側(フランジ
カバー16の外側)への漏れが、前記隙間の拡大によっ
て増大するのを有効に防止することができる。
Further, even if the temperature is lowered due to the stoppage of the equipment, the annular sliding member 51 is forcibly reduced in diameter due to the increase in the tightening force due to the contraction of the metal ring 54, so that the outer circumference of the sleeve 21 is reduced. The expansion of the radial gap with the surface 21a is effectively suppressed. Therefore, the quenching fluid sent from the quenching hole 13 to the drain hole 14 through the inner circumferences of the sliding portions of the mating ring 31 and the seal ring 32 of the mechanical seal 3 is on the atmosphere A side (of the flange cover 16). The leakage to the outside can be effectively prevented from increasing due to the expansion of the gap.

【0016】また、例えば運転中における回転軸2の異
常振動の発生によって、スリーブ21の外周面21aが
環状摺動材51の内周面51cに接触し、このため万一
環状摺動材51にクラックが発生して破断されても、各
断片は、金属リング54の結束作用によって環状に保持
される。このため、クエンチング流体が、割れた環状摺
動材51の飛散によって大気A側へ大量に流出するとい
った事故を、有効に防止することができる。
Further, for example, due to occurrence of abnormal vibration of the rotary shaft 2 during operation, the outer peripheral surface 21a of the sleeve 21 comes into contact with the inner peripheral surface 51c of the annular sliding member 51. Even if cracks occur and break, the fragments are held in an annular shape by the binding action of the metal ring 54. Therefore, it is possible to effectively prevent an accident in which a large amount of the quenching fluid flows out to the atmosphere A side due to the scattering of the cracked annular sliding member 51.

【0017】なお、この実施例によるフローティングブ
ッシュシール5は、メカニカルシール3のクエンチング
を行うための流体に対するシール手段として用いられた
ものとして説明したが、その用途はクエンチング用シー
ルに特に限定されるものではない。
Although the floating bush seal 5 according to this embodiment has been described as being used as a sealing means for the fluid for quenching the mechanical seal 3, its use is limited to the quenching seal. Not something.

【0018】[0018]

【発明の効果】本発明によると、環状摺動材は、それ自
体の熱膨張率が小さくても、温度が変化すると、熱膨張
・収縮の大きい金属リングの締め付け力の変化によっ
て、回転体の半径方向の熱膨張・収縮に対応して拡径・
縮径されるので、回転体と環状摺動材の熱膨張差による
両者間の半径方向隙間の大きさの変化が抑制され、した
がって回転体との接触による環状摺動材の破損が防止さ
れると共に、前記隙間における密封性が良好に維持され
る。しかも、環状摺動材が万一破壊されても、金属リン
グがこれを外周から結束して飛散を阻止するので、環状
摺動材の破壊・飛散による突発的な漏れの増大を有効に
防止することができる。
According to the present invention, even if the annular sliding member itself has a small coefficient of thermal expansion, when the temperature changes, the tightening force of the metal ring, which has large thermal expansion and contraction, changes the tightening force of the rotating member. Expanding diameter to accommodate thermal expansion and contraction in the radial direction
Since the diameter is reduced, the change in the size of the radial gap between the rotating body and the annular sliding member due to the difference in thermal expansion between them is suppressed, and therefore the annular sliding member is prevented from being damaged due to contact with the rotating body. At the same time, good sealing performance is maintained in the gap. Moreover, even if the ring-shaped sliding member is broken, the metal ring binds it from the outer periphery to prevent the ring-shaped member from scattering. Therefore, it is possible to effectively prevent an unexpected increase in leakage due to breakage or scattering of the ring-shaped sliding member. be able to.

【図面の簡単な説明】[Brief description of drawings]

【図1】クエンチング用のシール手段として本発明の一
実施例のフローティングブッシュシール5を用いた軸封
装置を、その軸心を通る平面で切断して示す断面図であ
る。
FIG. 1 is a cross-sectional view showing a shaft sealing device using a floating bush seal 5 according to an embodiment of the present invention as a quenching sealing means, taken along a plane passing through the shaft center thereof.

【図2】上記実施例のフローティングブッシュシールの
環状摺動材を示す一部切断した斜視図である。
FIG. 2 is a partially cutaway perspective view showing an annular sliding member of the floating bush seal of the above embodiment.

【図3】クエンチング用のシール手段として従来のフロ
ーティングブッシュシール4を用いた軸封装置を、その
軸心を通る平面で切断して示す断面図である。
FIG. 3 is a cross-sectional view showing a shaft sealing device using a conventional floating bush seal 4 as a sealing means for quenching, cut along a plane passing through the shaft center thereof.

【符号の説明】[Explanation of symbols]

1 ハウジング 2 回転軸(回転体) 21 スリーブ(回転体) 5 フローティングブッシュシール 51 環状摺動材 51a 衝合面 51c 内周面 54 金属リング DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft (rotating body) 21 Sleeve (rotating body) 5 Floating bush seal 51 Annular sliding material 51a Abutting surface 51c Inner peripheral surface 54 Metal ring

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ハウジング側に非回転状態に支持され、
軸方向一端の衝合面が前記ハウジング側の端面に半径方
向移動自在に密接衝合されると共に、内周面が回転体の
外周面に微小隙間を介して対向された環状摺動材を備え
たフローティングブッシュシールにおいて、 前記環状摺動材が、その外周面に適当な締め付け力で嵌
着され前記環状摺動材よりも熱膨張率の大きい金属リン
グで縮径歪を加えられたことを特徴とするフローティン
グブッシュシール。
1. A non-rotating state supported on the housing side,
An abutting surface at one end in the axial direction is abutted against the end surface on the housing side so as to be movable in the radial direction, and an inner peripheral surface is provided with an annular sliding member opposed to the outer peripheral surface of the rotating body with a minute gap. In the floating bush seal, the annular sliding member is fitted with an appropriate tightening force on the outer peripheral surface of the annular sliding member, and a diameter reduction strain is applied to the annular sliding member by a metal ring having a coefficient of thermal expansion larger than that of the annular sliding member. Floating bush seal to be used.
【請求項2】 環状に成形した摺動材の外周面にこの摺
動材よりも熱膨張率の大きい金属リングを焼き嵌めして
この摺動材に縮径歪を加える工程と、 この金属リングの焼き嵌め後に前記摺動材の内周面を所
定の内径に仕上加工する工程と、 を含むことを特徴とするフローティングブッシュシール
の製造方法。
2. A step of shrink-fitting the sliding material by shrink-fitting a metal ring having a coefficient of thermal expansion larger than that of the sliding material on the outer peripheral surface of the sliding material formed into an annular shape, and the metal ring. And finishing the inner peripheral surface of the sliding member to a predetermined inner diameter after shrink fitting.
JP20682293A 1993-07-30 1993-07-30 Floating bush seal and its manufacture Pending JPH0742849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20682293A JPH0742849A (en) 1993-07-30 1993-07-30 Floating bush seal and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20682293A JPH0742849A (en) 1993-07-30 1993-07-30 Floating bush seal and its manufacture

Publications (1)

Publication Number Publication Date
JPH0742849A true JPH0742849A (en) 1995-02-10

Family

ID=16529661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20682293A Pending JPH0742849A (en) 1993-07-30 1993-07-30 Floating bush seal and its manufacture

Country Status (1)

Country Link
JP (1) JPH0742849A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112112896A (en) * 2020-09-10 2020-12-22 芜湖新从工业设计有限公司 Magnetic axial bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112112896A (en) * 2020-09-10 2020-12-22 芜湖新从工业设计有限公司 Magnetic axial bearing

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