EP3781851A1 - Floating-ring seal - Google Patents
Floating-ring sealInfo
- Publication number
- EP3781851A1 EP3781851A1 EP19714165.8A EP19714165A EP3781851A1 EP 3781851 A1 EP3781851 A1 EP 3781851A1 EP 19714165 A EP19714165 A EP 19714165A EP 3781851 A1 EP3781851 A1 EP 3781851A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- floating
- throttle
- seal
- groove
- sealing
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- F16J15/44—Free-space packings
- F16J15/441—Free-space packings with floating ring
-
- 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
- F16J15/44—Free-space packings
-
- 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
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/4472—Labyrinth packings with axial path
Definitions
- the invention relates to a floating seal for sealing on a rotating component, in particular a rotating shaft, with significantly reduced weight and simplified locking against rotation of the floating ring seal with the rotating component.
- Floating ring seals are known from the prior art in different configurations. Floating ring seals are used, for example, for sealing pump shafts in high-speed pumps. Here are
- Floating seals arranged floating on the shaft and can follow a corresponding radial deflection, especially in radial deflections of the shaft.
- a problem with floating seals is hereby the constantly existing gap between the floating ring seal and the rotating component, over which a relatively high leakage occurs. Therefore, usually several Brownringdichtu lengths are arranged in series one after the other. However, this leads to a considerable structural complexity and in particular a necessary in the axial direction of the component to be sealed large space, thereby increasing a total construction length of the pump or the like. What such pump manufacturers want to avoid as possible.
- Another problem with floating seals may be that during operation, the floating seal with the rotating shaft rotates. However, this leads in particular to those facing away from the shaft sides of the floating seal to increased wear. Therefore, it would be desirable to avoid such wear.
- the dependent claims each show preferred developments of the invention.
- the floating seal according to the invention for sealing on a rotating component in addition to a simpler assembly / disassembly also has a significant weight advantage. Furthermore, co-rotation of the floating ring seal can be avoided during operation with a rotating component, in particular a shaft on which seals the floating seal.
- the floating seal has a sealing body, softer seals on the rotating component, and a sealing ring carrier which holds the seal body.
- a detent is provided, which is arranged on the sealing ring carrier and is adapted to hold the sealing ring carrier on a housing or the like. The lock prevents co-rotation of the sealing ring carrier and connected to the sealing ring carrier seal body.
- a kraftschiüssige connection may be provided between the sealing ring carrier and the seal body.
- the catch for holding the floating ring seal against co-rotation preferably comprises a bolt with a head.
- the head has a larger diameter than the bolt.
- the bolt is fixed in the sealing ring carrier.
- the fixation is preferably carried out by means of a threaded connection.
- the Boizen can be easily screwed into the sealing ring carrier and the head protrudes from the sealing ring carrier and can against stop surfaces aniiegen to avoid co-rotation of the floating seal.
- the sealing body is free of recesses.
- a weakening of the seal body can be avoided, so that the dimensions and weight of the seal body can be significantly reduced.
- the floating seal can be provided very compact and lightweight.
- the sealing body preferably has a rectangular cross section without recesses, bores, recesses or the like.
- the floating seal comprises a housing having a recess for floating receiving the seal body and the seal carrier.
- a lateral depression for receiving the locking is formed in the recess.
- the lateral recess in the recess is preferably a longitudinal groove or a cylindrical recess with a diameter which is greater than a dimension of the locking, thereby ensuring that the floating seal can follow radial wave movements despite the locking projecting into the lateral recess ,
- Such radial Ausienkungen the shaft can be caused in operation by different causes. If the floating seal could not follow such radial shaft movements here, this would lead to a direct contact and in operation to high wear of the seal body.
- the floating seal comprises a one-piece seal body having a first and a second radially inwardly directed throttle surface.
- the throttle surfaces are separated from each other by means of a first circumferential groove on the inner circumference of the seal body.
- the groove is disposed between the first and second throttle surfaces. Due to the configuration of a one-piece sealing body with two throttle surfaces, which are each directed to the rotating component, and, wherein a throttle gap between the rotating member and the two throttle surfaces is present results in comparison with two individual floating ring seals as in the prior art, a significant weight advantage , In comparison with two individual floating ring seals, the total mass of the floating seal according to the invention can be reduced by about 40%.
- a width of the first throttle area in the axial direction of the floating ring seal is less than or equal to a second width of the throttle area in the axial direction of the floating ring seal.
- Another great advantage of the inventive arrangement with two throttle surfaces with interposed groove is that a leakage flow, which flows over the first throttle area in the direction of the second throttle area, is slowed down in the groove, so that the leakage then significantly over the second throttle area is reduced.
- the leakage flow in particular form a counterflow.
- the groove has a groove width which is smaller than or equal to the first width of the first throttle area and / or which is smaller than or equal to the second width of the second throttle area.
- the one-piece sealing body further comprises a third radially inwardly directed throttle surface.
- the third throttle area is arranged in series after the second throttle area. Furthermore is between the second and third throttle surface, a second circumferential groove disposed on an inner periphery of the seal body.
- the one-piece sealing body comprises a fourth throttling surface.
- a third circumferential groove is formed on the inner circumference of the one-piece sealing body between the third and the fourth Drosselelfiambae.
- the one-piece sealing body is a carbon seal.
- a significant cost reduction can be achieved.
- the present invention relates to a component assembly comprising a floating seal according to the invention and a rotating component, in particular a shaft.
- the shaft is particularly preferably a pump shaft or a compressor shaft.
- the component arrangement comprises a first throttle gap between the first throttle face of the one-piece sealing body of the floating-ring seal and the rotating component and a second throttle gap between the second throttle face of the one-piece seal body and the rotating component. More preferably, the throttle surfaces and the surface of the rotating component are formed such that a gap height of the first throttle gap and / or the second throttle gap remains constant in Axiaicardi. A gap height of the first throttle gap is preferably the same as a gap height of the second throttle gap.
- the component arrangement is preferably a pump or a compressor or a turbine.
- the component assembly is preferably operated at very high speeds.
- Fig. 1 is a schematic sectional view of a component arrangement with a
- Fig. 2 is a schematic, perspective view of a component arrangement with a
- Fig. 3 is a schematic, perspective view of a component arrangement with a
- the floating seal 2 comprises a one-piece seal body 20 and a sealing ring carrier 6.
- the sealing ring carrier 8 is adapted to hold the one-piece seal body 20.
- a non-positive connection between the sealing ring carrier 6 and the sealing body 20 is preferably provided.
- the one-piece seal body 20 includes a first throttle area 21 and a second throttle area 22.
- the first throttle area 21 is disposed radially on an inwardly directed portion of the one-piece seal body 20.
- the second throttle surface 22 is arranged on the radially inwardly directed region of the one-piece sealing body 20.
- the floating-ring seal 2 seals a product area 10 of an atmosphere area 11 on a shaft 3.
- a first Drosseispalt 8 is formed between the first throttle surface 21 and a surface of the shaft 3 and between the second Drossei skills 22 and the surface of the while 3 a second throttle gap 9 becameiidet.
- a groove 23 is disposed between the first throttle surface 21 and the second Drossei nature 22.
- the groove 23 is provided circumferentially on the inner periphery of the one-piece seal body 20.
- a first width B1 of the first Drossei testing 21 in the axial direction X-X is smaller than a second width B2 of the second Drossei task 22. Further, a width N1 of the groove 23 in the axial direction X-X is smaller than the first width B1 and the second width B2.
- a first gap height at the first throttle gap 8 is constant in the axial direction X-X.
- a second gap height at the second throttle gap 9 in the axial direction is constant.
- the gap heights of the first and second throttle gaps are preferably chosen such that the second gap height at the second throttle gap 9 is the same as the first gap height at the first throttle gap 8.
- the floating seal 2 is arranged in a recess 5 in a housing 4.
- the housing 4 is designed in several parts in order to allow mounting in Axiaicardi the shaft 3.
- the floating-ring seal 2 is arranged in a floating manner in the recess 5.
- the floating ring seal 2 can follow the wave motion in the case of radial deflections of the shaft 3, which can occur during operation. This may be in the radial wave motion to come a short contact between the shaft 3 and the one-piece seal body 20.
- the floating seal 2 further comprises a lock 7 to allow a fixation in the housing 4.
- the lock 7 comprises a bolt 70 with a head 71.
- the bolt 70 is arranged in the sealing ring carrier 6.
- the head 71 is in
- a radial clearance in the lateral recess 50 is provided for the head 71 so that the floating seal 2 can join the above-described radial deflections of the shaft. This is indicated by the double arrow A.
- the lateral recess 50 is preferably a radially extending groove.
- the lateral recess 50 is a cylindrical recess with a larger diameter than a diameter of the head 71 of the detent 7.
- a projection 40 projecting in the axial direction X-X is formed on the housing 4.
- the floating seal can be safely guided in the recess 5.
- the projection 40 prevents the medium from bypassing the throttle gaps 8, 9 via a path behind the floating-ring seal 2
- the projection 40 is provided completely circumferentially in the circumferential direction.
- the lock 7 is provided by design of a bolt 70 with a head 71 very simple and inexpensive. Since the lock 7 is arranged on the sealing ring carrier 6 and the lateral recess 50 is formed in the housing, the sealing ring carrier 6 can have a very small overall height in the radial direction. Thus, a dimension of the sealing ring carrier 6 can be reduced, whereby additionally a weight reduction is achieved.
- the seal body 20 can be replaced by the one-piece design of the seal body 20, the hitherto used in the prior art two individual floating ring seals by the inventive floating seal.
- a significant weight reduction in a range of up to about 40% can be obtained.
- the unification of the seal body 20, the assembly and disassembly in a necessary replacement of the floating seal 2 is significantly simplified.
- the lock 7 is provided exclusively in the seal carrier 6, the one-piece seal body 20 of the floating seal can be designed without weakening recesses, grooves or the like to receive a lock. As a result, the weight of the sealing body 20 is further reduced and a life of the one-piece sealing body 20 is significantly increased.
- a depth of the groove 23 is dabet selected such that in the region of the groove 23, at least a partial backflow C of the leakage, which has passed through the first Drosseispalt 8 to the groove 23 occurs.
- a flow velocity of the leakage is additionally reduced via the floating ring seal and the further leakage via the second throttle gap 9 is minimized.
- Fig. 2 shows a component assembly 1 according to a secondentesbeispiei of the invention, wherein the same or functionally identical parts are designated by the same reference numerals.
- the component arrangement 1 comprises two separate floating-ring seals 2 according to the invention.
- the basic construction of the floating-ring seals 2 is the same as in the first exemplary embodiment.
- the floating ring seals 2 are arranged mirror-inverted to one another on the shaft 3.
- four Drosseispalte are provided from the product area 10 to the atmospheric region 11.
- a circumferential groove 41 is provided in the housing 4 in the region between the first and second floating seal 2. In this circumferential groove 41, the leakage supplied via the first floating seal 2 collects and forms a return flow C and further reduces the leakage occurring via the second floating ring seal to the atmosphere region 11.
- the detents 7 of the two floating ring seals are also arranged mirror-inverted.
- a structure of the component arrangement of the second exemplary embodiment can be significantly simplified, since in the housing part in each case the two lateral recesses 50 are formed between the two floating ring seals.
- the floating-ring seal 2 of the third exemplary embodiment comprises a third throttle surface 25.
- a first groove 23 is provided between the first and second throttle surfaces 21, 22 between the second
- Throttling surface 22 and the third throttle surface 25 a second groove 26 is provided.
- the first groove 23 and the second groove 26 are formed completely circumferentially.
- a one-piece sealing body 20 is provided with three throttle surfaces, whereby leakage from the product area 10 to the atmospheric area 11 is further reduced.
- the lock 7 shown in Fig. 3 is in this case carried out as in the first embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Mechanical Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Gasket Seals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018205979.9A DE102018205979A1 (en) | 2018-04-19 | 2018-04-19 | FLOATING RING SEAL |
PCT/EP2019/057444 WO2019201561A1 (en) | 2018-04-19 | 2019-03-25 | Floating-ring seal |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3781851A1 true EP3781851A1 (en) | 2021-02-24 |
Family
ID=65955211
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19714165.8A Withdrawn EP3781851A1 (en) | 2018-04-19 | 2019-03-25 | Floating-ring seal |
Country Status (8)
Country | Link |
---|---|
US (1) | US20210116033A1 (en) |
EP (1) | EP3781851A1 (en) |
JP (1) | JP7183296B2 (en) |
KR (1) | KR20200139828A (en) |
CN (1) | CN112074678B (en) |
DE (1) | DE102018205979A1 (en) |
RU (1) | RU2755963C1 (en) |
WO (1) | WO2019201561A1 (en) |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2917329A (en) * | 1955-05-13 | 1959-12-15 | City Nat Bank And Trust Compan | Rotary seal |
US3971563A (en) * | 1973-09-17 | 1976-07-27 | Mitsui Shipbuilding And Engineering Co., Ltd. | Shaft sealing apparatus using a fluid sealing system |
JPS5347168Y2 (en) * | 1974-09-20 | 1978-11-11 | ||
US4177997A (en) * | 1978-12-08 | 1979-12-11 | General Motors Corporation | Floating seal |
SU838226A1 (en) * | 1979-09-26 | 1981-06-15 | Всесоюзный Научно-Исследовательскийи Конструкторско-Технологический Институткомпрессорного Машиностроения | Shaft seal |
SU1573282A1 (en) * | 1988-08-11 | 1990-06-23 | Предприятие П/Я Г-4461 | Shaft floating seal |
US5322298A (en) * | 1992-06-09 | 1994-06-21 | Dresser-Rand Company | Shaft seal |
RU2105216C1 (en) * | 1996-11-21 | 1998-02-20 | Николай Александрович Цветков | Floating sealing ring of slotted seal |
EP1039184A1 (en) * | 1999-03-22 | 2000-09-27 | Dresser Rand S.A | Shaft seal |
US6431553B1 (en) * | 2000-08-28 | 2002-08-13 | The United States Of America As Represented By The Secretary Of The Navy | Radially pressure balanced floating seal system |
US7396017B2 (en) * | 2002-06-21 | 2008-07-08 | Isotech Of Illinois, Inc. | Shaft seal assembly |
US20060033287A1 (en) * | 2004-08-11 | 2006-02-16 | Giuseppe Rago | Controlled gap carbon seal |
US20100253005A1 (en) * | 2009-04-03 | 2010-10-07 | Liarakos Nicholas P | Seal for oil-free rotary displacement compressor |
US8496226B2 (en) * | 2010-04-30 | 2013-07-30 | Fisher Controls International Llc | Floating ball valve seal with bellows and C-seal |
CN202545182U (en) * | 2012-04-26 | 2012-11-21 | 成都赛乐化新机电有限公司 | Dry gas seal for synthesis gas compressor |
-
2018
- 2018-04-19 DE DE102018205979.9A patent/DE102018205979A1/en not_active Ceased
-
2019
- 2019-03-25 US US17/048,015 patent/US20210116033A1/en not_active Abandoned
- 2019-03-25 JP JP2020556903A patent/JP7183296B2/en active Active
- 2019-03-25 CN CN201980026618.6A patent/CN112074678B/en active Active
- 2019-03-25 RU RU2020137707A patent/RU2755963C1/en active
- 2019-03-25 EP EP19714165.8A patent/EP3781851A1/en not_active Withdrawn
- 2019-03-25 KR KR1020207033008A patent/KR20200139828A/en not_active Application Discontinuation
- 2019-03-25 WO PCT/EP2019/057444 patent/WO2019201561A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20210116033A1 (en) | 2021-04-22 |
JP7183296B2 (en) | 2022-12-05 |
DE102018205979A1 (en) | 2019-10-24 |
WO2019201561A1 (en) | 2019-10-24 |
CN112074678A (en) | 2020-12-11 |
RU2755963C1 (en) | 2021-09-23 |
JP2021521392A (en) | 2021-08-26 |
KR20200139828A (en) | 2020-12-14 |
CN112074678B (en) | 2022-12-30 |
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DAV | Request for validation of the european patent (deleted) | ||
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18D | Application deemed to be withdrawn |
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