EP1305525A1 - Axial thrust compensation device - Google Patents
Axial thrust compensation deviceInfo
- Publication number
- EP1305525A1 EP1305525A1 EP01984492A EP01984492A EP1305525A1 EP 1305525 A1 EP1305525 A1 EP 1305525A1 EP 01984492 A EP01984492 A EP 01984492A EP 01984492 A EP01984492 A EP 01984492A EP 1305525 A1 EP1305525 A1 EP 1305525A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ring element
- gap
- compensation device
- axial thrust
- thrust compensation
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0416—Axial thrust balancing balancing pistons
Definitions
- a relief device in the form of a double piston shows the solution according to US Pat. No. 2,221,225.
- Its double piston is of multi-part design, an annular element with stepped outer diameters being arranged axially displaceably between two flange-shaped outer parts.
- This ring element called the leakage control ring, is not arranged to rotate during normal operation. The rotation during normal operation prevents a sealant like a piston ring.
- Such narrow piston rings usually consist of spring steel and are compressed against the spring action, in order to then expand under the action of a spring in the installed state and to constantly rest against a cylindrical wall surface under spring force.
- Relief piston rotates.
- the cross section of the remaining gap separating the ring element is many times smaller than the circular gap of a conventional relief piston.
- a gap current now only flows through the gap in the ring element itself and through the ring gaps that exist between the axial end faces of the ring element and the opposite lateral boundary walls of the groove. This is mainly where the gap volume flow is throttled.
- FIG. 1 shows a detail from a turbomachine with an axial thrust compensation device according to the invention
- 6 and 7 a ring element according to the invention with axial bores
- 8 and 9 a further alternative of the ring element according to the invention.
- the gap separating the ring element can also be further improved in terms of reducing the leakage.
- 4 and 5 show examples of this.
- Both the wave-shaped gap 12 in the ring element 13 of FIG. 4 and the meandering gap 14 in the ring element 15 of FIG. 5 increase the gap length available for throttling and thus the throttling effect.
- an additional throttling effect results from the deflection of the leakage current occurring within a gap 12 or 14.
- other designs such as a serrated gap profile or any combination of different lines, are also possible.
- 6 and 7 as an alternative, a ring element 16 is shown, which is provided with axially extending bores 17.
- the bores 17 conduct liquid from the side of higher pressure to the side of lower pressure of the ring element 16.
- the liquid emerging at the end face there acts as a lubricating film between this end face and the adjacent groove wall (not shown here).
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10038586A DE10038586A1 (en) | 2000-08-03 | 2000-08-03 | Axial thrust |
DE10038586 | 2000-08-03 | ||
PCT/EP2001/007052 WO2002012728A1 (en) | 2000-08-03 | 2001-06-22 | Axial thrust compensation device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1305525A1 true EP1305525A1 (en) | 2003-05-02 |
EP1305525B1 EP1305525B1 (en) | 2006-08-02 |
Family
ID=7651662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01984492A Expired - Lifetime EP1305525B1 (en) | 2000-08-03 | 2001-06-22 | Axial thrust compensation device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1305525B1 (en) |
AT (1) | ATE335134T1 (en) |
DE (2) | DE10038586A1 (en) |
WO (1) | WO2002012728A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20115516U1 (en) * | 2001-09-20 | 2001-11-29 | Grundfos As | Centrifugal pump |
DE10248162A1 (en) * | 2002-10-16 | 2004-04-29 | Ksb Aktiengesellschaft | Element defining a gap to be placed on a shaft |
JP4352903B2 (en) | 2004-01-15 | 2009-10-28 | 株式会社日立プラントテクノロジー | Single-shaft multistage pump |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2221225A (en) * | 1938-04-16 | 1940-11-12 | Pacific Pump Works | Balancing and leakage device for centrifugal pumps |
US2329990A (en) * | 1942-02-12 | 1943-09-21 | Ingersoll Rand Co | Sealing device |
US3033623A (en) * | 1958-09-02 | 1962-05-08 | John B Thomson | Fluorocarbon sleeve bearing |
US3157444A (en) * | 1962-10-12 | 1964-11-17 | Rockwell Standard Co | Slotted bearing sleeve with lubricant retaining means |
EP0078345A1 (en) * | 1981-10-31 | 1983-05-11 | Bran & Lübbe GmbH | Centrifugal pump with axial thrust compensation driven by an air-gap sleeve motor |
FI940630A (en) * | 1994-02-11 | 1995-08-12 | Ahlstroem Oy | centrifugal |
DE29500744U1 (en) * | 1995-01-18 | 1996-05-15 | Sihi Ind Consult Gmbh | Fluid machine with relief piston |
-
2000
- 2000-08-03 DE DE10038586A patent/DE10038586A1/en not_active Withdrawn
-
2001
- 2001-06-22 EP EP01984492A patent/EP1305525B1/en not_active Expired - Lifetime
- 2001-06-22 WO PCT/EP2001/007052 patent/WO2002012728A1/en active IP Right Grant
- 2001-06-22 DE DE50110632T patent/DE50110632D1/en not_active Expired - Lifetime
- 2001-06-22 AT AT01984492T patent/ATE335134T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0212728A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE335134T1 (en) | 2006-08-15 |
DE50110632D1 (en) | 2006-09-14 |
DE10038586A1 (en) | 2002-02-14 |
WO2002012728A1 (en) | 2002-02-14 |
EP1305525B1 (en) | 2006-08-02 |
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