WO2001031238A1 - Mechanical seal - Google Patents
Mechanical seal Download PDFInfo
- Publication number
- WO2001031238A1 WO2001031238A1 PCT/GB2000/004122 GB0004122W WO0131238A1 WO 2001031238 A1 WO2001031238 A1 WO 2001031238A1 GB 0004122 W GB0004122 W GB 0004122W WO 0131238 A1 WO0131238 A1 WO 0131238A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal
- ring
- component
- mechanical seal
- end ring
- Prior art date
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
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/38—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member sealed by a packing
Definitions
- This invention relates to mechanical seals and, in particular, mechanical seals with bellows units.
- a mechanical seal comprises a "floating" component which is mounted around a rotatable shaft for axial movement relative thereto.
- the rotatable shaft may be that of, for example, a pump.
- the seal includes a "static" component which is axially fixed, typically being secured to a housing.
- the floating component has a flat annular end face (seal face) directed towards a corresponding seal face of the static component.
- the floating component is urged, usually by means of one or more springs, towards the static component to close the seal faces together to form a sliding face seal.
- one of the floating and static components rotates and is termed the rotary component.
- the other of the floating and static components does not rotate and is termed the stationary component.
- a seal whose floating component is rotary is described as a rotary seal. If the floating component is stationary, the seal is a stationary seal.
- the seal is termed a "cartridge seal”. If the seal is despatched by the manufacturer in unassembled form, the seal is termed a "component seal”.
- the floating component is generally axially energised by the use of at least one spring member.
- bellows units are often employed and they axially energise a mechanical seal face without the requirement for a dynamic, moving elastomer. This is an advantage in high temperature applications as the elastomer often limits the extent to which the seal can operate successfully.
- the in the bellows unit also facilitate heat dissipation within a barrier fluid system commonly employed with mechanical seals. Such heat dissipation, due to the large surface area of the bellows unit, helps to prolong seal survival.
- a metal bellows arrangement has a bellows unit welded to and located between first and second end rings.
- One of said end rings carries the seal face and the other is attached to some other seal component, thereby anchoring the bellows arrangement within the seal.
- the bellows arrangement may be anchored to the rotable shaft in a component seal and to the sleeve in a cartridge seal.
- sealing ring is required between the anchored end ring and the component to which it is attached.
- the sealing ring is an elastomer in the form of an O-ring.
- Such a sealing ring is adequate for many applications.
- an O-ring is not sufficiently robust.
- a seal in the form of a grafoil wedge is typically used.
- Such a seal may have approximately the same inner and outer diameter as the O-ring but has a greater axial length and is wedged-shaped with its inner axial length greater than its outer axial length.
- the anchored end ring is shaped to accommodate either an O-ring or a grafoil wedge. Accordingly stocks of metal bellows arrangements have to include both those for use with O-rings and those for use with grafoil wedges. The metal bellows arrangements are very expensive. Furthermore, if in practice, it is found that the seal incorporating an O-ring is not suitable, then the metal bellows arrangement has to be removed and replaced by one which can accommodate a grafoil wedge.
- a mechanical seal incorporating a metal bellows arrangement having a bellows unit located between first and second end rings, said first end ring carrying a seal face and said second end ring anchoring the arrangement to another seal component, said second end ring having associated therewith a sealing ring located between said second end ring and said another seal component, said second end ring being shaped to accommodate said sealing ring in a range of different cross-sectional shapes.
- the mechanical seal is a rotary seal although it should be understood that the invention may be applied to a stationary seal.
- a mechanical seal in accordance with the present invention may be of the component type or of the cartridge type.
- Figure 1 shows the bellows arrangement of a known seal with an O-ring
- Figure 2 shows the bellows arrangement of a known seal with a grafoil wedge
- Figure 3 shows the cartridge mechanical seal of the invention having an O- ring
- Figure 4 shows a cartridge mechanical seal of the invention having a grafoil wedge
- Figure 5 shows a component seal of the invention having an O-ring
- Figure 6 shows a component seal of the invention having a grafoil wedge.
- FIG. 1 and 2 of the accompanying drawings show the bellows arrangements of a known seal.
- the bellows arrangement 1 is provided with a bellows unit 3 which is welded to end rings 5 and 7.
- End ring 5 carries the seal face 9 and end ring 7 is attached to a further seal component 1 1 which may itself be attached directly to a drive shaft 13 in the case of a component seal or be attached to or form part of a sleeve 15 in the case of a cartridge seal.
- Bellows arrangement 1 is made out of stainless steel and is a relatively expensive item. As illustrated in Figures 1 and 2, the end rings 1 are differently shaped according to whether they are associated with an O-ring 17 or a grafoil wedge 19, each of which provides sealing between the bellows arrangement and the structure to which it is fixed. Accordingly it is necessary to carry stocks of both bellows arrangements so that the appropriate one can be chosen for use with an O-ring or a grafoil wedge according to the operating conditions.
- a cartridge seal having a sleeve 21 located about a pump shaft 23.
- the rotary components include a bellows arrangement 25 including a bellows unit 27, a first end ring 29 carrying seal face 31 and a second end ring 33 which is attached to end flange 35 of seal 21 by means of screws 37.
- Sleeve 21 is profiled to accommodate a first O-ring 39 in sleeve recess 41, this O- ring providing sealing between sleeve 21 and the shaft 23.
- a second, outwardly facing recess 43 in sleeve 21 accommodates a second O-ring 45 which bears against the inner surface of end ring 33.
- end ring 33 is broadly wedge-shaped at least adjacent bellows unit
- FIG. 5 of the accompanying drawings there is illustrated a bellows arrangement used in connection with a component seal and incorporating an elastomer O-ring 61.
- the O-ring bears directly against the shaft 63 and the space between the wedge shaped portion of ring 65 and shaft 63 is occupied by a small ring of triangular cross-section.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00972976A EP1224414A1 (en) | 1999-10-27 | 2000-10-27 | Mechanical seal |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9925288.4A GB9925288D0 (en) | 1999-10-27 | 1999-10-27 | Mechanical seal |
GB9925288.4 | 1999-10-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001031238A1 true WO2001031238A1 (en) | 2001-05-03 |
WO2001031238A9 WO2001031238A9 (en) | 2002-09-06 |
Family
ID=10863384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/004122 WO2001031238A1 (en) | 1999-10-27 | 2000-10-27 | Mechanical seal |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1224414A1 (en) |
GB (1) | GB9925288D0 (en) |
WO (1) | WO2001031238A1 (en) |
ZA (1) | ZA200203314B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003014602A1 (en) * | 2001-08-03 | 2003-02-20 | Aes Engineering Limited | A mechanical seal without elastomers |
GB2386930A (en) * | 2002-03-18 | 2003-10-01 | Aes Eng Ltd | A bellows-type mechanical seal for a rotating shaft |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3773337A (en) * | 1972-01-17 | 1973-11-20 | Durametallic Corp | Bellows seal |
US3776560A (en) * | 1971-03-04 | 1973-12-04 | Borg Warner | Bellows type fluid seal |
GB2217397A (en) * | 1988-04-12 | 1989-10-25 | Flexibox Ltd | Shaft seal wedge packing |
-
1999
- 1999-10-27 GB GBGB9925288.4A patent/GB9925288D0/en not_active Ceased
-
2000
- 2000-10-27 WO PCT/GB2000/004122 patent/WO2001031238A1/en not_active Application Discontinuation
- 2000-10-27 EP EP00972976A patent/EP1224414A1/en not_active Withdrawn
-
2002
- 2002-04-25 ZA ZA200203314A patent/ZA200203314B/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3776560A (en) * | 1971-03-04 | 1973-12-04 | Borg Warner | Bellows type fluid seal |
US3773337A (en) * | 1972-01-17 | 1973-11-20 | Durametallic Corp | Bellows seal |
GB2217397A (en) * | 1988-04-12 | 1989-10-25 | Flexibox Ltd | Shaft seal wedge packing |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003014602A1 (en) * | 2001-08-03 | 2003-02-20 | Aes Engineering Limited | A mechanical seal without elastomers |
GB2394016A (en) * | 2001-08-03 | 2004-04-14 | Aes Eng Ltd | A mechanical seal without elastomers |
GB2394016B (en) * | 2001-08-03 | 2005-04-06 | Aes Eng Ltd | Mechanical and non-mechanical seals without elastomers |
US7029012B2 (en) | 2001-08-03 | 2006-04-18 | Aes Engineering Ltd. | Mechanical seal without elastomers |
GB2386930A (en) * | 2002-03-18 | 2003-10-01 | Aes Eng Ltd | A bellows-type mechanical seal for a rotating shaft |
GB2386930B (en) * | 2002-03-18 | 2005-11-23 | Aes Eng Ltd | A metal bellows mechanical seal |
Also Published As
Publication number | Publication date |
---|---|
WO2001031238A9 (en) | 2002-09-06 |
EP1224414A1 (en) | 2002-07-24 |
ZA200203314B (en) | 2003-09-23 |
GB9925288D0 (en) | 1999-12-29 |
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