WO2013099385A1 - Rotary joint - Google Patents
Rotary joint Download PDFInfo
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- WO2013099385A1 WO2013099385A1 PCT/JP2012/075678 JP2012075678W WO2013099385A1 WO 2013099385 A1 WO2013099385 A1 WO 2013099385A1 JP 2012075678 W JP2012075678 W JP 2012075678W WO 2013099385 A1 WO2013099385 A1 WO 2013099385A1
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- passage
- annular groove
- annular
- rotary joint
- peripheral surface
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/087—Joints with radial fluid passages
Definitions
- the present invention relates to a rotary joint including a magnetic fluid seal.
- a rotary shaft and a housing having a shaft hole through which the rotary shaft is inserted are provided, and passages provided in both the rotary shaft and the housing are connected via an annular gap provided between the two.
- a constructed rotary joint is known (see Patent Document 1).
- various sealing devices are provided in order to suppress leakage of gas flowing through the passage.
- a magnetic fluid seal is known as a sealing device that can keep the friction torque extremely low.
- a magnetic fluid seal there is a disadvantage that a structure for stably holding the magnetic fluid is technically difficult compared to solid materials such as rubber and resin.
- the passage on the rotation shaft side Since a flow path that linearly connects the housing and the passage on the housing side is formed, gas flows rapidly. As a result, the pressure in the sealed region by the sealing device changes abruptly. Therefore, when a magnetic fluid seal is employed, it becomes a problem how to stably hold the magnetic fluid.
- a technique is also known in which a labyrinth seal is provided at a position between the port and the magnetic fluid seal so as to suppress pressure fluctuations on the portion holding the magnetic fluid (see Patent Document 2).
- Patent Document 2 A technique is also known in which a labyrinth seal is provided at a position between the port and the magnetic fluid seal so as to suppress pressure fluctuations on the portion holding the magnetic fluid (see Patent Document 2).
- Patent Document 2 A technique is also known in which a labyrinth seal is provided at a position between the port and the magnetic fluid seal so as to suppress pressure fluctuations on the portion holding the magnetic fluid.
- An object of the present invention is to provide a rotary joint that enables a magnetic fluid to be stably held.
- the present invention employs the following means in order to solve the above problems.
- the rotary joint of the present invention is A rotating shaft comprising a first passage opening in the outer peripheral surface; A housing having a shaft hole through which the rotating shaft is inserted and having a second passage communicating the inner peripheral surface and the outer peripheral surface; A first annular groove that is fixed to the outer periphery of the rotating shaft and disposed at a position connected to the first passage is provided on the inner peripheral surface side, a second annular groove is provided on the outer peripheral surface side, and the first A first annular member provided with a third passage communicating the annular groove and the second annular groove; A third annular groove fixed to the inner periphery of the housing and disposed at a position connected to the second passage is provided on the outer peripheral surface side, and an annular space is provided between the inner peripheral surface side and the second annular groove.
- a fourth annular groove to be formed is provided, and a fourth passage is provided to communicate the third annular groove and the fourth annular groove, and the second annular member is provided slidably with respect to the first annular member.
- a pair of magnetic fluid seals provided on both axial sides of the first annular member and the second annular member and sealing an annular gap between the rotating shaft and the housing;
- a rotary joint comprising: The first passage, the second passage, the third passage, and the fourth passage are arranged at positions where they are not aligned in a straight line regardless of the rotational position of the rotary shaft with respect to the housing.
- the first passage, the second passage, the third passage, and the fourth passage are arranged at positions where they are not aligned in a straight line regardless of the rotational position of the rotation shaft with respect to the housing. Therefore, it is possible to suppress a sudden decrease in flow path resistance during rotation of the rotating shaft, and it is possible to suppress a sudden flow of gas flowing through these passages. Thereby, it can suppress that the pressure in the sealing area
- a plurality of the third passages are provided at a predetermined interval in the rotation direction of the rotation shaft. Thereby, it can suppress further that gas flows rapidly.
- the fourth passage and the first passage are provided at a predetermined interval in the rotation direction of the rotation shaft.
- the magnetic fluid can be stably held.
- FIG. 1 is a schematic cross-sectional view of a rotary joint according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic cross-sectional view of the rotary joint according to the first embodiment of the present invention.
- FIG. 3 is a schematic cross-sectional view of the rotary joint according to the first embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of the rotary joint according to the first embodiment of the present invention.
- FIG. 5 is a schematic cross-sectional view of the rotary joint according to the second embodiment of the present invention.
- Example 1 A rotary joint according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a schematic cross-sectional view of a rotary joint according to Embodiment 1 of the present invention, cut along a plane including an axis.
- 2 to 4 are schematic cross-sectional views of the rotary joint according to the first embodiment of the present invention cut along a plane perpendicular to the axis. Note that the cross-sectional views shown in FIGS. 2 to 4 correspond to cross-sectional views taken along the AA cross-section in FIG. 2 to 4 show cases where the rotational positions of the later-described rotational shafts are different from each other.
- the rotary joint according to the present embodiment is suitably used, for example, for a portion that drives a rotary shaft extending from the atmosphere side in a sealed container kept in a vacuum state. Further, it is suitably used as a rotary joint capable of supplying a gas such as air from the atmosphere side to a vacuum side device via a rotary shaft.
- the rotary joint 1 includes a rotary shaft 10, a housing 20 having a shaft hole through which the rotary shaft 10 is inserted, a first annular member 50 fixed to the outer periphery of the rotary shaft 10, A second annular member 60 fixed around the circumference and a pair of magnetic fluid seals 40 provided on both axial sides of these annular members are provided.
- the rotary shaft 10 includes a first passage 11 that is bent in the radial direction at a position that passes through the central axis from one end portion in the axial direction and does not reach the other end portion and opens to the outer peripheral surface.
- a plurality of annular microprojections 12 are formed on the outer peripheral surface of the rotating shaft 10 to hold the magnetic fluid 43 in a magnetic fluid seal 40 described later.
- the rotating shaft 10 is made of a magnetic material.
- the housing 20 includes a second passage 21 that communicates the inner peripheral surface with the outer peripheral surface.
- an outward flange 22 for fixing the rotary joint 1 to a device to which the rotary joint 1 is attached is provided on one end side of the housing 20.
- a cover 23 for holding and fixing various members provided in an annular gap between the rotary shaft 10 and the housing 20 is fixed to the other end side of the housing 20.
- the housing 20 is made of a nonmagnetic material. Further, ball bearings 30 are provided in the vicinity of both ends of the housing 20 so that the rotary shaft 10 can rotate concentrically and smoothly with respect to the housing 20.
- the first annular member 50 is provided with a first annular groove 51 disposed at a position connected to the first passage 11 on the inner peripheral surface side thereof.
- a second annular groove 52 is provided on the outer peripheral surface side of the first annular member 50.
- a third passage 53 that communicates the first annular groove 51 and the second annular groove 52 is provided.
- a plurality of third passages 53 are provided at predetermined intervals (fixed intervals) in the rotation direction of the rotary shaft 10.
- the first annular member 50 is fixed to the rotary shaft 10 by the set screw 70. At this time, in the rotational direction of the rotary shaft 10, the first passage 11 provided in the rotary shaft 10 and the third passage 53 provided in the first annular member 50 are not aligned in a straight line.
- the one annular member 50 is fixed in a state of being positioned with respect to the rotary shaft 10 (see FIGS. 2 to 4).
- the first annular member 50 is made of a nonmagnetic material. Further, a gap is formed between the first annular member 50 and the pole piece 42 so as not to slide with the pole piece 42 provided in the magnetic fluid seal 40 described later.
- the second annular member 60 is provided with a third annular groove 61 arranged at a position connected to the second passage 21 on the outer peripheral surface side.
- a fourth annular groove 62 that forms an annular space K between the second annular groove 52 and the second annular groove 52 is provided on the inner peripheral surface side of the second annular member 60.
- a fourth passage 63 that communicates the third annular groove 61 and the fourth annular groove 62 is provided.
- a plurality of fourth passages 63 are provided at predetermined intervals (fixed intervals) in the rotation direction of the rotary shaft 10. As described above, by providing the annular space K between the second annular groove 52 and the fourth annular groove 62, the circumferential pressure can be balanced.
- a minute gap is provided between the outer peripheral surface of the first annular member 50 and the inner peripheral surface of the second annular member 60, and even when the rotary shaft 10 is rotating, there is no sliding between them. Dynamic resistance does not occur. Therefore, in the rotary joint 1, there is no place where sliding resistance is generated in design. That is, the ball bearing 30 functions as a bearing while the ball rolls, so that almost no sliding resistance is generated. Further, in the magnetic fluid seal 40, since the magnetic fluid 43 is interposed between the pole piece 42 and the rotating shaft 10, almost no sliding resistance is generated.
- the second annular member 60 is made of a nonmagnetic material. The second annular member 60 also serves as a spacer for positioning the pair of magnetic fluid seals 40 (determining the distance between them).
- the pair of magnetic fluid seals 40 are respectively provided on an annular permanent magnet 41, a pair of annular pole pieces 42 provided on both axial sides of the permanent magnet 41, an inner peripheral surface of the pole piece 42, and the rotating shaft 10. And a magnetic fluid 43 held between the plurality of annular microprotrusions 12.
- the permanent magnet 41 is configured such that one end side in the axial direction is an N pole and the other end side is an S pole.
- the pole piece 42 is made of a magnetic member, and the rotary shaft 10 is also made of a magnetic member.
- a spacer 80 made of a non-magnetic material is provided between the magnetic fluid seal 40 (more specifically, the pole piece 42) and the ball bearing 30 in order to determine the distance therebetween.
- the rotary joint 1 includes an O-ring between the rotary shaft 10 and the first annular member 50 and between the housing 20 and various members (the second annular member 60 and the pole piece 42). O is provided to prevent gas leakage.
- the first annular member 50 is fixed with respect to the rotating shaft 10, the first annular member 50 provided in the rotating shaft 10 and the first annular member 50 are provided even if the rotating shaft 10 rotates.
- the positional relationship with the third passage 53 does not change.
- it is comprised so that the 1st channel
- the first passage 11, the second passage 21, the third passage 53, and the fourth passage 63 are in a straight line regardless of the rotational position of the rotary shaft 10 with respect to the housing 20. It is arranged at a position not lined up. Therefore, it is possible to suppress a sudden decrease in flow path resistance while the rotating shaft 10 is rotating, and it is possible to suppress a sudden flow of gas flowing through these passages. Thereby, it can suppress that the pressure in the sealing area
- the rotating shaft 10 is rotated once every rotation.
- the first passage 11, the second passage 21, the third passage 53, and the fourth passage 63 are aligned.
- the flow velocity is rapidly increased, and the gas in the annular space R flows vigorously toward the annular space K through the gap between the first annular member 50 and the second annular member 60 due to the so-called Venturi effect. Therefore, the internal pressure in the annular space R changes abruptly. Thereby, in particular, it has been confirmed that the magnetic fluid 43 held at a position close to the annular space R flows out to the annular space R side.
- FIG. 5 shows a second embodiment of the present invention.
- a configuration in the case where a plurality of first passages provided in the rotation shaft are provided in the configuration shown in the first embodiment is shown. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
- FIG. 5 is a schematic cross-sectional view of the rotary joint according to the second embodiment of the present invention cut along a plane perpendicular to the axis.
- the rotary joint 1 according to the present embodiment is different from the first embodiment only in that a plurality of first passages 11 provided in the rotary shaft 10 are provided. Note that the first passage 11 and the third passage 53 are configured so as not to be aligned in a straight line with respect to all the first passages 11.
- the first passage 11, the second passage 21, the second passage 21, and the second passage 53 are arranged so that the first passage 11 and the third passage 53 do not line up in a straight line.
- the present invention is not limited to this, and by preventing the second passage 21 and the fourth passage 63 from being aligned, the first passage 11, the second passage 21, the second passage 21, regardless of the rotational position of the rotary shaft 10. It is also possible to configure so that the third passage 53 and the fourth passage 63 do not line up in a straight line. Of course, it goes without saying that the first passage 11 and the third passage 53 may not be aligned, and the second passage 21 and the fourth passage 63 may not be aligned.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Description
外周面に開口する第1通路を備える回転軸と、
該回転軸が挿通される軸孔を有し、かつ内周面と外周面とを連通する第2通路を備えるハウジングと、
前記回転軸の外周に固定され、かつ内周面側には第1通路に繋がる位置に配置される第1環状溝が設けられ、外周面側には第2環状溝が設けられると共に、第1環状溝と第2環状溝とを連通する第3通路が備えられている第1環状部材と、
前記ハウジングの内周に固定され、かつ外周面側には第2通路に繋がる位置に配置される第3環状溝が設けられ、内周面側には第2環状溝との間で環状空間を形成する第4環状溝が設けられると共に、第3環状溝と第4環状溝とを連通する第4通路が備えられており、第1環状部材に対して摺動自在に設けられる第2環状部材と、
第1環状部材及び第2環状部材の軸方向の両側に設けられ、前記回転軸と前記ハウジングとの間の環状隙間を封止する一対の磁性流体シールと、
を備える回転継手であって、
第1通路,第2通路,第3通路及び第4通路は、前記ハウジングに対する回転軸の回転位置に拘らず、これらが一直線上に並ばない位置に配置されていることを特徴とする。 That is, the rotary joint of the present invention is
A rotating shaft comprising a first passage opening in the outer peripheral surface;
A housing having a shaft hole through which the rotating shaft is inserted and having a second passage communicating the inner peripheral surface and the outer peripheral surface;
A first annular groove that is fixed to the outer periphery of the rotating shaft and disposed at a position connected to the first passage is provided on the inner peripheral surface side, a second annular groove is provided on the outer peripheral surface side, and the first A first annular member provided with a third passage communicating the annular groove and the second annular groove;
A third annular groove fixed to the inner periphery of the housing and disposed at a position connected to the second passage is provided on the outer peripheral surface side, and an annular space is provided between the inner peripheral surface side and the second annular groove. A fourth annular groove to be formed is provided, and a fourth passage is provided to communicate the third annular groove and the fourth annular groove, and the second annular member is provided slidably with respect to the first annular member. When,
A pair of magnetic fluid seals provided on both axial sides of the first annular member and the second annular member and sealing an annular gap between the rotating shaft and the housing;
A rotary joint comprising:
The first passage, the second passage, the third passage, and the fourth passage are arranged at positions where they are not aligned in a straight line regardless of the rotational position of the rotary shaft with respect to the housing.
図1~図4を参照して、本発明の実施例1に係る回転継手について説明する。図1は本発明の実施例1に係る回転継手において、軸心を含む面で切断した模式的断面図である。図2~図4は本発明の実施例1に係る回転継手において、軸心に垂直な面で切断した模式的断面図である。なお、図2~図4に示す断面図は、図1におけるAA断面の位置で切断した断面図に相当する。また、図2~図4においては、後述する回転軸の回転位置がそれぞれ異なる場合を示している。なお、本実施例に係る回転継手は、例えば、真空状態に保たれた密封容器内に大気側から延びた回転軸を駆動する部位に好適に用いられる。また、大気側から回転軸を介して空気などの気体を真空側の機器に供給可能な回転継手として好適に用いられる。 Example 1
A rotary joint according to
本実施例に係る回転継手1は、回転軸10と、回転軸10が挿通される軸孔を有するハウジング20と、回転軸10の外周に固定される第1環状部材50と、ハウジング20の内周に固定される第2環状部材60と、これらの環状部材の軸方向の両側に設けられる一対の磁性流体シール40とを備えている。 <Overall structure of rotary joint>
The
本実施例に係る回転継手1においては、回転軸10の回転方向の位置に拘らず、第1環状溝51,第3通路53,環状空間K(第2環状溝52と第4環状溝62とで形成される空間),第4通路63及び第3環状溝61を通じて、第1通路11から第2通路21に至る流路が形成される(図2~図4参照)。従って、回転軸10が回転しているか否かに関係なく、常時、気体を、回転継手1が取り付けられる装置内に送り込む、または当該装置内から外部に送り出すことが可能となる。 <Operation of rotary joint>
In the rotary joint 1 according to the present embodiment, the first
本実施例に係る回転継手1によれば、第1通路11,第2通路21,第3通路53及び第4通路63は、ハウジング20に対する回転軸10の回転位置に拘らず、これらが一直線上に並ばない位置に配置されている。そのため、回転軸10の回転中に、流路抵抗が急に低下してしまうことを抑制でき、これらの通路を流れる気体が急激に流れてしまうことを抑制することができる。これにより、磁性流体シール40による密封領域内の圧力が急激に変化してしまうことを抑制でき、磁性流体43を安定的に保持することができる。 <Excellent points of the rotary joint according to this embodiment>
According to the rotary joint 1 according to the present embodiment, the
図5には、本発明の実施例2が示されている。本実施例においては、上記実施例1に示した構成において、回転軸に設けられる第1通路を複数設けた場合の構成を示している。その他の構成および作用については実施例1と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。 (Example 2)
FIG. 5 shows a second embodiment of the present invention. In the present embodiment, a configuration in the case where a plurality of first passages provided in the rotation shaft are provided in the configuration shown in the first embodiment is shown. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.
上記各実施例においては、第1通路11と第3通路53とが一直線上に並ばないようにすることで、回転軸10の回転位置に拘らず、第1通路11,第2通路21,第3通路53及び第4通路63が一直線上に並ばないように構成した場合を示した。 (Other)
In each of the embodiments described above, the
10 回転軸
11 第1通路
12 微小突起
20 ハウジング
21 第2通路
22 フランジ
23 カバー
30 ボールベアリング
40 磁性流体シール
41 永久磁石
42 ポールピース
43 磁性流体
50 第1環状部材
51 第1環状溝
52 第2環状溝
53 第3通路
60 第2環状部材
61 第3環状溝
62 第4環状溝
63 第4通路
70 セットスクリュ
80 スペーサ
K,R 環状空間
O Oリング DESCRIPTION OF
Claims (4)
- 外周面に開口する第1通路を備える回転軸と、
該回転軸が挿通される軸孔を有し、かつ内周面と外周面とを連通する第2通路を備えるハウジングと、
前記回転軸の外周に固定され、かつ内周面側には第1通路に繋がる位置に配置される第1環状溝が設けられ、外周面側には第2環状溝が設けられると共に、第1環状溝と第2環状溝とを連通する第3通路が備えられている第1環状部材と、
前記ハウジングの内周に固定され、かつ外周面側には第2通路に繋がる位置に配置される第3環状溝が設けられ、内周面側には第2環状溝との間で環状空間を形成する第4環状溝が設けられると共に、第3環状溝と第4環状溝とを連通する第4通路が備えられており、第1環状部材に対して摺動自在に設けられる第2環状部材と、
第1環状部材及び第2環状部材の軸方向の両側に設けられ、前記回転軸と前記ハウジングとの間の環状隙間を封止する一対の磁性流体シールと、
を備える回転継手であって、
第1通路,第2通路,第3通路及び第4通路は、前記ハウジングに対する回転軸の回転位置に拘らず、これらが一直線上に並ばない位置に配置されていることを特徴とする回転継手。 A rotating shaft comprising a first passage opening in the outer peripheral surface;
A housing having a shaft hole through which the rotating shaft is inserted and having a second passage communicating the inner peripheral surface and the outer peripheral surface;
A first annular groove that is fixed to the outer periphery of the rotating shaft and disposed at a position connected to the first passage is provided on the inner peripheral surface side, a second annular groove is provided on the outer peripheral surface side, and the first A first annular member provided with a third passage communicating the annular groove and the second annular groove;
A third annular groove fixed to the inner periphery of the housing and disposed at a position connected to the second passage is provided on the outer peripheral surface side, and an annular space is provided between the inner peripheral surface side and the second annular groove. A fourth annular groove to be formed is provided, and a fourth passage is provided to communicate the third annular groove and the fourth annular groove, and the second annular member is provided slidably with respect to the first annular member. When,
A pair of magnetic fluid seals provided on both axial sides of the first annular member and the second annular member and sealing an annular gap between the rotating shaft and the housing;
A rotary joint comprising:
The rotary joint, wherein the first passage, the second passage, the third passage, and the fourth passage are arranged at positions where they are not aligned in a straight line regardless of the rotational position of the rotational shaft with respect to the housing. - 第3通路は、回転軸の回転方向に所定の間隔で複数備えられていることを特徴とする請求項1に記載の回転継手。 The rotary joint according to claim 1, wherein a plurality of third passages are provided at predetermined intervals in the rotation direction of the rotary shaft.
- 第4通路は、回転軸の回転方向に所定の間隔で複数備えられていることを特徴とする請求項1または2に記載の回転継手。 The rotary joint according to claim 1 or 2, wherein a plurality of the fourth passages are provided at predetermined intervals in the rotation direction of the rotary shaft.
- 第1通路は、回転軸の回転方向に所定の間隔で複数備えられていることを特徴とする請求項1,2または3に記載の回転継手。 The rotary joint according to claim 1, 2, or 3, wherein a plurality of the first passages are provided at predetermined intervals in the rotation direction of the rotary shaft.
Priority Applications (2)
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JP2013551505A JP5913374B2 (en) | 2011-12-27 | 2012-10-03 | Rotary joint |
KR1020137032917A KR101527313B1 (en) | 2011-12-27 | 2012-10-03 | Rotary Joint |
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JP2011286604 | 2011-12-27 | ||
JP2011-286604 | 2011-12-27 |
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PCT/JP2012/075678 WO2013099385A1 (en) | 2011-12-27 | 2012-10-03 | Rotary joint |
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KR (1) | KR101527313B1 (en) |
WO (1) | WO2013099385A1 (en) |
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WO2015174306A1 (en) * | 2014-05-13 | 2015-11-19 | イーグルブルグマンジャパン株式会社 | Method for assembling ferrofluid seal, and ferrofluid seal |
CN105972219A (en) * | 2016-07-29 | 2016-09-28 | 广西科技大学 | Staggered tooth end face type magnetic fluid sealing device |
CN106015583A (en) * | 2016-07-28 | 2016-10-12 | 广西科技大学 | Symmetrical staggered-tooth type magnetic fluid sealing device |
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CN108799672A (en) * | 2018-08-23 | 2018-11-13 | 天津海外海科技有限公司 | A kind of cunning ring of impact resistance and application method |
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CN110762307A (en) * | 2019-12-03 | 2020-02-07 | 中国工程物理研究院总体工程研究所 | Magnetic fluid sealing rotary joint |
CN112228655A (en) * | 2020-09-09 | 2021-01-15 | 北京航天万鸿高科技有限公司 | Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator |
CN112917239A (en) * | 2021-03-26 | 2021-06-08 | 宁波天控五轴数控技术有限公司 | Center cooling rotary joint for high-speed electric spindle |
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KR101896288B1 (en) * | 2017-01-16 | 2018-09-11 | 박광준 | Rotary type magnetic fluid seal apparatus |
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US20170051833A1 (en) * | 2014-05-13 | 2017-02-23 | EagleBurgmann Japan Co., Ltd. | Assembly method of magnetic fluid seal and magnetic fluid seal |
TWI575174B (en) * | 2014-05-13 | 2017-03-21 | 日本伊格爾博格曼股份有限公司 | Magnetic fluid seal |
JPWO2015174306A1 (en) * | 2014-05-13 | 2017-04-20 | イーグルブルグマンジャパン株式会社 | Magnetic fluid seal assembly method and magnetic fluid seal |
US10024437B2 (en) | 2014-05-13 | 2018-07-17 | EagleBurgmann Japan Co., Ltd. | Assembly method of magnetic fluid seal and magnetic fluid seal |
WO2015174306A1 (en) * | 2014-05-13 | 2015-11-19 | イーグルブルグマンジャパン株式会社 | Method for assembling ferrofluid seal, and ferrofluid seal |
CN106015583A (en) * | 2016-07-28 | 2016-10-12 | 广西科技大学 | Symmetrical staggered-tooth type magnetic fluid sealing device |
CN105972219A (en) * | 2016-07-29 | 2016-09-28 | 广西科技大学 | Staggered tooth end face type magnetic fluid sealing device |
CN107906209A (en) * | 2017-12-13 | 2018-04-13 | 广西科技大学 | A kind of magnetic fluid sealing structure for concentric double-shaft |
CN109707937A (en) * | 2018-06-22 | 2019-05-03 | 东莞市科能精密机械有限公司 | More gas circuit rotary joints |
CN108799672A (en) * | 2018-08-23 | 2018-11-13 | 天津海外海科技有限公司 | A kind of cunning ring of impact resistance and application method |
CN110762307A (en) * | 2019-12-03 | 2020-02-07 | 中国工程物理研究院总体工程研究所 | Magnetic fluid sealing rotary joint |
CN110762307B (en) * | 2019-12-03 | 2024-04-12 | 中国工程物理研究院总体工程研究所 | Magnetic fluid sealing rotary joint |
CN112228655A (en) * | 2020-09-09 | 2021-01-15 | 北京航天万鸿高科技有限公司 | Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator |
CN112228655B (en) * | 2020-09-09 | 2022-04-22 | 北京航天万鸿高科技有限公司 | Rotary joint magnetic liquid sealing device of rotary table refrigeration incubator |
CN112917239A (en) * | 2021-03-26 | 2021-06-08 | 宁波天控五轴数控技术有限公司 | Center cooling rotary joint for high-speed electric spindle |
CN112917239B (en) * | 2021-03-26 | 2022-06-14 | 宁波天控五轴数控技术有限公司 | Center cooling rotary joint for high-speed electric spindle |
Also Published As
Publication number | Publication date |
---|---|
KR101527313B1 (en) | 2015-06-09 |
JP5913374B2 (en) | 2016-04-27 |
KR20140018380A (en) | 2014-02-12 |
JPWO2013099385A1 (en) | 2015-04-30 |
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