WO2017141929A1 - ブラシシール - Google Patents
ブラシシール Download PDFInfo
- Publication number
- WO2017141929A1 WO2017141929A1 PCT/JP2017/005401 JP2017005401W WO2017141929A1 WO 2017141929 A1 WO2017141929 A1 WO 2017141929A1 JP 2017005401 W JP2017005401 W JP 2017005401W WO 2017141929 A1 WO2017141929 A1 WO 2017141929A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- brush
- groove
- grooves
- back plate
- brush seal
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
-
- 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
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
- F16J15/3288—Filamentary structures, e.g. brush seals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
-
- 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
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/20—Packing materials therefor
- F16J15/22—Packing materials therefor shaped as strands, ropes, threads, ribbons, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/55—Seals
- F05D2240/56—Brush seals
Definitions
- the present invention relates to a brush seal that seals between two rotating members of a rotating machine such as a turbine.
- a seal is used to prevent gas from leaking from the high pressure side to the low pressure side along the periphery of the rotor. It is hoped that the seal follows the gap and eccentricity of the stator and rotor of the rotating machine and exerts sealing ability. From this point of view, instead of the labyrinth seal, a brush seal that bundles extremely fine bristles is used. Has been.
- the conventional brush seal 100 is mainly composed of a brush 102 in which fine bristles are bundled, a high pressure side H side plate 105, and a low pressure side L back plate 107.
- the brush 102 is pressed against the back plate 107 side by the pressure of the sealed fluid, so that the movement of the brush 102 occurs even if the gap between the tips of the rotor 109 and the brush 102 occurs due to thermal expansion or eccentricity of the rotor 109. May not be performed smoothly, and the followability inherent in the brush seal 100 may not be sufficiently exhibited.
- JP 2002-139154 (paragraph 0033, FIG. 1)
- the brush seal of Patent Document 1 has circumferential grooves 108 arranged in the back plate 107 along the circumferential direction in order to apply a balance pressure to the brush 102. Therefore, as the pressure difference between the high-pressure side H and the low-pressure side L increases, when the brush 102 is pressed against the back plate 107 side, a part of the brush 102 enters the circumferential groove 108 and bends, and the tip of the brush 102 Moves in a direction away from the rotor 109, and a gap g with an interval greater than the expected gap is generated between the brush 102 and the rotor 109, and there is a concern that the sealed fluid that leaks through the gap g increases (see FIG. 8). .)
- an annular support portion 110 is provided at the radial center of the circumferential groove 108 to reduce the deformation amount of the brush 102.
- a part of the brush 102 enters the circumferential groove 108 and bends, and the tip of the brush 102 may be separated from the rotor 109.
- the support part 110 is provided in the center of radial direction and the brush 102 contacts the same support part 110 at the time of use, there exists a possibility that the brush 102 may be worn out at the place of the support part 110 concerned.
- the present invention has been made paying attention to such problems, and an object of the present invention is to provide a brush seal with less leakage of a sealed fluid.
- the brush seal of the present invention is In a brush seal comprising a brush in which a plurality of bristles are bundled, and an annular back plate provided on a low pressure side of the brush and provided with a groove for introducing a sealed fluid, A plurality of the grooves are provided to be inclined with respect to the circumferential direction of the back plate and the extending direction of the brush. According to this feature, since the grooves are inclined, a large number of grooves are arranged with respect to the brush, and the brush is abutted and supported in the axial direction by a large number of lands between the grooves. The leakage of the sealed fluid can be suppressed.
- the plurality of grooves are formed in the same shape and are equally arranged in the circumferential direction. According to this feature, the pressure acting from the groove acts on the brush evenly in the extending direction of the brush, so that the deflection of the brush in the axial direction can be reduced.
- the plurality of grooves are discontinuous independent grooves. According to this feature, since there is a continuous land around the groove, the sealed fluid is reliably stored in the groove.
- a land continuous in the circumferential direction is formed radially inward of the groove of the back plate. According to this feature, the sealed fluid introduced into the groove can be prevented from flowing out to the low pressure side.
- the brush and the groove are inclined and extended in opposite directions with respect to the radial direction of the pack plate. According to this feature, many grooves can be disposed on the brush.
- the groove is provided so as to be inclined by 45 degrees in the circumferential direction of the back plate. According to this feature, many grooves can be disposed on the brush.
- FIG. 1 is a cross-sectional view of a brush seal in Example 1.
- FIG. It is a front view of the back plate of FIG. 1, and is a figure which shows the state which assembled
- the brush density is plotted as sparse.
- FIG. 3 is a sectional view of the back plate of FIG. 2 taken along line III-III. It is an enlarged view of IV area
- FIG. 1 shows an example in which the brush seal 1 is used for shaft sealing of a rotating machine such as a turbine.
- the tip of the brush 4 approaches or contacts the rotor 9 of the rotating machine, so that the high pressure side inside the rotating machine is shown.
- the sealed gas such as H vapor and fuel gas is prevented from leaking to the low pressure side L.
- the brush seal 1 is formed in an annular shape, and is mainly composed of a back plate 2 on the low pressure side L, a side plate 3 on the high pressure side H, and a brush 4.
- the back plate 2 and the side plate 3 are fastened and fixed by bolts 5 inserted into the counterbore 6 with the brush 4 sandwiched therebetween.
- the brush 4 is mainly composed of a brush portion 4a composed of a plurality of bristles and a mounting portion 4b in which a plurality of bristles are bundled and integrated at one end by welding or caulking, and the cross section is formed in a substantially hammer shape.
- Bristol has a wire diameter of 0.05 to 0.5 mm, a material of steel, an alloy such as a nickel base or a cobalt base, ceramics, and a mounting portion 4b made of metal.
- a material of steel an alloy such as a nickel base or a cobalt base, ceramics, and a mounting portion 4b made of metal.
- the back plate 2 and the side plate 3 are formed of stainless steel, their materials are not limited.
- a position opposed to the brush 4 and the axial direction of the back plate 2 has a groove 10 is provided, the pressure P H of the gas on the high pressure side H is applied to the brush 4, the pressing force F1 the brush 4 in the back plate 2 side Press.
- the gas that has mainly passed between the bristles of the brush 4 is held by the groove 10 and presses the brush 4 to the side plate 3 side by the pressing force F2.
- Each groove 10 is formed in a substantially parallelogram of the same shape, and is equally distributed in the circumferential direction on the brush facing surface 11.
- the groove 10 has a substantially straight shape in which both ends 10a and 10b in the radial direction of the straight portion 10c are obliquely viewed in plan view.
- Each groove 10 is independent, and an inner diameter side land surface 11 ⁇ / b> A, an inter-groove land surface 11 ⁇ / b> B, and an outer diameter side land surface 11 ⁇ / b> C are disposed around each groove 10.
- the inner diameter side land surface 11A is formed continuously in the circumferential direction.
- the circumferential length of the inter-groove land surface 11 ⁇ / b> B is preferably longer than the circumferential length of the groove 10.
- the inner diameter side land surface 11A, the inter-groove land surface 11B, and the outer diameter side land surface 11C are flat surfaces and have the same surface (height).
- the edges between the groove 10 and the inner diameter side land surface 11A, the inter-groove land surface 11B, and the outer diameter side land surface 11C are chamfered or rounded. This prevents the brush 4 from being worn out by the edge.
- the length, width, and depth of the groove 10 may be determined according to the specifications of the fluid device, and may be, for example, about several tens of millimeters, several millimeters, and sufficient several millimeters.
- the groove 10 is provided on the brush facing surface 11 so as to be inclined with respect to the radial direction R, and an angle ⁇ between the extending direction G and the radial direction R is approximately 45 degrees. That is, the extending direction G is also inclined at an angle of approximately 45 degrees with respect to the circumferential direction on the brush facing surface 11 (more precisely, it is inclined at an angle of approximately 45 degrees with respect to the tangent on the periphery. ). Further, the brush 4 is provided to be inclined with respect to the radial direction R on the brush facing surface 11, and an angle ⁇ formed by the extending direction B and the radial direction R is approximately 45 degrees. And since the inclination direction of the groove
- the groove 10 Since the groove 10 is inclined with respect to the circumferential direction and the brush 4, a large number of grooves are arranged with respect to the brush 4.
- approximately eight grooves, one inner diameter side land surface 11 ⁇ / b> A, outer diameter land surface 11 ⁇ / b> C, and seven inter-groove land surfaces 11 ⁇ / b> B are arranged in the extending direction B of the brush 4. .
- the brush 4 is abutted and supported in the axial direction by the numerous inter-groove land surfaces 11B between the grooves 10, and the force in the F2 direction (FIG. 1) acts on the brush 4 from the gas in the numerous grooves 10. To do. Therefore, there is little deflection
- the brush 4 since the brush 4 is supported in the axial direction by a large number of inter-groove land surfaces 11B between the grooves 10, the pressing force F1 acting on the brush 4 can be distributed and received. Furthermore, since the location where the pressing force F1 (FIG. 1) acting on the brush 4 in the radial direction is high differs depending on the use situation and timing, the brush 4 is not grooved without a strong pressing force acting on the same inter-groove land surface 11B. It can suppress that it is slid and cut
- the groove 10 is inclined with respect to the circumferential direction, the gas that has passed through the brush 4 is guided in the radial direction even if it is introduced into the groove 10 from any position in the radial direction. From this, unlike the circumferential double groove 108 shown in FIG. 9, even if gas is introduced into the groove 10 from any position in the radial direction, pressure is guided in the radial direction, and from the groove 10 in the radial direction.
- the reaction force can be made uniform.
- the extending directions B and G of the brush 4 and the groove 10 are inclined 45 degrees in the radial direction R and on the opposite side with respect to the back plate 2, respectively.
- many grooves 10 can be arranged with respect to the brush 4.
- the angle of the brush 4 changes according to the operating state of the rotating device, but the brush 4 may be arranged so as to be inclined at about 45 degrees with respect to the radial direction R during operation (when the rotor 9 rotates).
- the extending direction G 45 of the groove 10, with respect to the radial direction is inclined 45 degrees.
- the extending direction B of the brush 4 is opposite to the groove 10 and is inclined 45 degrees with respect to the radial direction.
- the brush 4 moves along the brush facing surface 11 by ⁇ , crosses the groove 10 from the point C1 to the point C2, and the moving distance on the groove 10 is ⁇ L. 12 .
- the extending direction G 60 of the groove 10, with respect to the radial direction is inclined 60 degrees.
- the extending direction B of the brush 4 is opposite to the groove 10 and is inclined 45 degrees with respect to the radial direction.
- the brush 4 moves along the brush facing surface 11 by ⁇ , traverses the groove 10 from the point C3 to the point C4, and the moving distance on the groove 10 is ⁇ L. 34 .
- the movement distance ⁇ L 12 is shorter than the movement distance ⁇ L 34 .
- the plurality of grooves 10 are formed in the same shape and are equally arranged in the circumferential direction, the pressure acting from the grooves 10 acts on the brush 4 equally in the extending direction B of the brush 4. For this reason, the deflection of the brush 4 in the axial direction can be reduced.
- Example 2 will be described with reference to FIG.
- the radial end portions 10a and 10b of the linear portion 10c of the groove 10 are each in an oblique shape in plan view.
- the radial end portions 10d and 10e are in a plan view arc shape, respectively. It is. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
- the both ends 10d and 10e in the radial direction are formed in arcs when viewed in plan, there is no sharp edge at the end, and even if the brush 4 slides along the brush facing surface 11, the brush 4 The possibility that the two ends 10d and 10e in the radial direction may be worn out can be reduced.
- the groove 10 may be inclined with respect to the circumferential direction and the extending direction B of the brush 4.
- the extending direction G of the groove 10 and the extending direction B of the brush 4 are preferably opposite to the radial direction R. This is because many grooves 10 can be arranged with respect to the brush 4 and the possibility that the brush 4 enters along the groove 10 is reduced. When the brush 4 enters along the groove 10, the sealing performance may be lowered, and the brush 4 may be worn away with contact with the edge of the groove 10.
- the groove 10 has been described as an example of a substantially linear shape, it may be a curved shape having a curved surface.
- the longitudinal direction of the outer shape may be arranged to intersect the circumferential direction of the back plate 2 and the extending direction of the brush 4.
- the width of the groove 10 is substantially constant has been described as an example, the width may be changed in the extending direction of the groove.
- channel 10 demonstrated the example in which a linear groove
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Brushes (AREA)
Abstract
Description
複数のブリストルが束ねられたブラシと、前記ブラシの低圧側に配置され、被密封流体を導入する溝が設けられた円環状のバックプレートとを具備するブラシシールにおいて、
前記溝は、前記バックプレートの周方向及び前記ブラシの延在方向に対して傾斜して複数設けられていることを特徴としている。
この特徴によれば、溝を傾斜させているためブラシに対して多数の溝が配置されており、当該ブラシは溝間の多数のランドにより軸方向に当接支持されるため、ブラシの軸方向へのたわみが少なく被密封流体の漏れを抑制できる。
この特徴によれば、ブラシに対し、溝から作用する圧力がブラシの延在方向に均等に作用するため、ブラシの軸方向へのたわみをより少なくできる。
この特徴によれば、溝の周囲に連続するランドが存在するため、被密封流体が溝内に確実に貯留される。
この特徴によれば、溝に導入された被密封流体が低圧側に流出することを抑制できる。
この特徴によれば、ブラシに対して多くの溝を配置することができる。
この特徴によれば、ブラシに対して多くの溝を配置することができる。
2 バックプレート
3 サイドプレート
4 ブラシ
4a ブリストル
4b 取付部
10 溝
11 ブラシ対向面
11A 内径側ランド面
11B 溝間ランド面
11C 外径側ランド面
H 高圧側
L 低圧側
G 溝の延在方向
B ブラシの延在方向
R 径方向
θ 溝の傾斜角
φ ブラシの傾斜角
Claims (6)
- 複数のブリストルが束ねられたブラシと、前記ブラシの低圧側に配置され、被密封流体を導入する溝が設けられた円環状のバックプレートとを具備するブラシシールにおいて、
前記溝は、前記バックプレートの周方向及び前記ブラシの延在方向に対して傾斜して複数設けられていることを特徴とするブラシシール。 - 前記複数の溝は、同形状に形成されかつ周方向に等配されていることを特徴とする請求項1に記載のブラシシール。
- 前記複数の溝は、非連続の独立した溝であることを特徴とする請求項1又は2に記載のブラシシール。
- 前記バックプレートの前記溝よりも径方向内側には周方向に連なるランドが形成されていることを特徴とする請求項1乃至3のいずれかに記載のブラシシール。
- 前記ブラシ及び前記溝は前記パックプレートの径方向に対してそれぞれ反対側に傾斜して延在していることを特徴とする請求項1乃至4のいずれかに記載のブラシシール。
- 前記溝は前記バックプレートの周方向に45度傾斜して設けられていることを特徴とする請求項1乃至5のいずれかに記載のブラシシール。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187023259A KR102089024B1 (ko) | 2016-02-16 | 2017-02-15 | 브러시 시일 |
US16/072,856 US10975712B2 (en) | 2016-02-16 | 2017-02-15 | Brush seal |
JP2018500133A JP6759324B2 (ja) | 2016-02-16 | 2017-02-15 | ブラシシール |
EP17753185.2A EP3418609B1 (en) | 2016-02-16 | 2017-02-15 | Brush seal |
CN201780008735.0A CN108603599B (zh) | 2016-02-16 | 2017-02-15 | 刷式密封件 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016027305 | 2016-02-16 | ||
JP2016-027305 | 2016-02-16 |
Publications (1)
Publication Number | Publication Date |
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WO2017141929A1 true WO2017141929A1 (ja) | 2017-08-24 |
Family
ID=59625263
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2017/005401 WO2017141929A1 (ja) | 2016-02-16 | 2017-02-15 | ブラシシール |
Country Status (6)
Country | Link |
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US (1) | US10975712B2 (ja) |
EP (1) | EP3418609B1 (ja) |
JP (1) | JP6759324B2 (ja) |
KR (1) | KR102089024B1 (ja) |
CN (1) | CN108603599B (ja) |
WO (1) | WO2017141929A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110219992A (zh) * | 2019-07-09 | 2019-09-10 | 大连保税区华鸿工业技术有限公司 | 防止密封面损伤的密封装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002139154A (ja) | 2000-11-01 | 2002-05-17 | Eagle Engineering Aerospace Co Ltd | ブラシ型シール装置 |
WO2006104514A2 (en) * | 2005-03-28 | 2006-10-05 | Perkinelmer, Inc. | Brush seal with spiral groove back plate |
JP2008039180A (ja) * | 2006-07-10 | 2008-02-21 | Rolls Royce Plc | シール装置 |
Family Cites Families (10)
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US4403779A (en) | 1981-11-21 | 1983-09-13 | Crane Packing Limited | Seals for liquid-tight closure between rotary component and partition |
US5401036A (en) * | 1993-03-22 | 1995-03-28 | Eg & G Sealol, Inc. | Brush seal device having a recessed back plate |
US5884918A (en) * | 1996-10-04 | 1999-03-23 | Eg&G Sealol, Inc. | Brush seal with a flexible front plate |
GB0126220D0 (en) * | 2001-11-01 | 2002-01-02 | Alstom Switzerland Ltd | Brush seals |
US7255352B2 (en) * | 2005-09-29 | 2007-08-14 | General Electric Company | Pressure balanced brush seal |
GB0705671D0 (en) * | 2007-03-24 | 2007-05-02 | Cross Mfg Co 1938 Ltd | A seal |
US20100164177A1 (en) * | 2008-12-30 | 2010-07-01 | Eaton Corporation | Hybrid multistage brush seal |
CN101713301B (zh) | 2009-09-28 | 2012-06-06 | 江苏鑫信润科技有限公司 | 刷式汽封圈的生产方法 |
WO2013153867A1 (ja) | 2012-04-08 | 2013-10-17 | イーグル工業株式会社 | ブラシシール |
CN103174835B (zh) | 2013-04-11 | 2015-08-12 | 钟婕 | 旋转轴防漏端盖 |
-
2017
- 2017-02-15 CN CN201780008735.0A patent/CN108603599B/zh active Active
- 2017-02-15 US US16/072,856 patent/US10975712B2/en active Active
- 2017-02-15 WO PCT/JP2017/005401 patent/WO2017141929A1/ja active Application Filing
- 2017-02-15 EP EP17753185.2A patent/EP3418609B1/en active Active
- 2017-02-15 KR KR1020187023259A patent/KR102089024B1/ko active IP Right Grant
- 2017-02-15 JP JP2018500133A patent/JP6759324B2/ja active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002139154A (ja) | 2000-11-01 | 2002-05-17 | Eagle Engineering Aerospace Co Ltd | ブラシ型シール装置 |
WO2006104514A2 (en) * | 2005-03-28 | 2006-10-05 | Perkinelmer, Inc. | Brush seal with spiral groove back plate |
JP2008039180A (ja) * | 2006-07-10 | 2008-02-21 | Rolls Royce Plc | シール装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110219992A (zh) * | 2019-07-09 | 2019-09-10 | 大连保税区华鸿工业技术有限公司 | 防止密封面损伤的密封装置 |
Also Published As
Publication number | Publication date |
---|---|
EP3418609A4 (en) | 2019-09-25 |
JPWO2017141929A1 (ja) | 2018-12-06 |
CN108603599B (zh) | 2021-05-07 |
US20180371928A1 (en) | 2018-12-27 |
US10975712B2 (en) | 2021-04-13 |
EP3418609B1 (en) | 2020-09-09 |
CN108603599A (zh) | 2018-09-28 |
KR102089024B1 (ko) | 2020-03-16 |
KR20180102631A (ko) | 2018-09-17 |
EP3418609A1 (en) | 2018-12-26 |
JP6759324B2 (ja) | 2020-09-23 |
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