WO1996022468A1 - Strömungsmaschine mit entlastungskolben - Google Patents
Strömungsmaschine mit entlastungskolben Download PDFInfo
- Publication number
- WO1996022468A1 WO1996022468A1 PCT/EP1996/000185 EP9600185W WO9622468A1 WO 1996022468 A1 WO1996022468 A1 WO 1996022468A1 EP 9600185 W EP9600185 W EP 9600185W WO 9622468 A1 WO9622468 A1 WO 9622468A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- throttle
- ring
- gap
- relief piston
- radial
- Prior art date
Links
Classifications
-
- 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
- F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
- F01D3/04—Machines or engines with axial-thrust balancing effected by working-fluid axial thrust being compensated by thrust-balancing dummy piston or the like
-
- 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 throttle gap is established which is dependent on the difference between these pressures and which, with constant flow and constant operating conditions, enables contact-free power transmission.
- the shaft must be axially movable so that the throttle gap can be adjusted according to the pressure difference. In many cases this is impossible for operational safety reasons, in which the use of a shim is therefore prohibited. In these cases one grabs a so-called relief piston.
- This is a ring fixedly arranged on the shaft, which rotates with as little play as possible in the bore of a fixed housing part and is acted upon by a higher medium pressure on one side than on the other. The force resulting from this on the compensating piston serves to relieve a bearing which determines the axial position of the shaft.
- This high leakage can be avoided by providing the relief piston with a ring that is freely rotatable relative to it, which is sealed against the housing instead of the relief piston, does not rotate with respect to the housing, but is axially movable together with the relief piston (US -A 2,221,225).
- This ring sits in a circumferential groove of the relief piston, its end faces including two narrow gaps with the flanks of the groove parallel to it. During operation, the ring should assume an approximately central position between the groove flanks. The leakage current is then determined by the width of the two end gaps. The distance to the bottom of the groove has no effect since it is very large. Contact between the ring and the relief piston should normally not occur during operation.
- This known arrangement has the disadvantage that the size of the leakage current and the dynamic behavior of the ring depend on the play between the end faces of the ring and the groove flanks and thus depends on manufacturing tolerances and wear. It also tends to behave unstably.
- the invention is therefore based on the object of providing a relief arrangement of the type explained last, as specified in the preamble of claim 1, which is of simpler construction and does not tend to instability in operating behavior.
- the solution according to the invention consists in the features of claim 1 and preferably those of claim 2.
- the relief arrangement according to the invention only requires a radial annular gap between the relief piston and the throttle ring. This is preceded by a choke in the form of a narrow, cylindrical annular gap between these two parts. Since the throttling effect of this annular gap is independent of the axial position of the throttle ring, the operating behavior is very stable. Precise manufacture is not necessary.
- the arrangement according to the invention resembles a throttle gap seal through which there is a radial flow (Müller: Sealing of moving machine parts, Waiblingen 1990, pp. 141-144). It is a type of seal that is similar to mechanical seals, but includes a constantly open gap to reliably avoid solid-state contact between the sliding surfaces, which gap does not seal, but only restricts a leakage current.
- the special effect of the arrangement according to the invention in comparison with the known mechanical seal is that the throttle ring participates in the application of the relief force. Its entire cross section located within the housing bore is acted upon by the pressure difference forming the relief force. The portion of the force which is thereby due to it is transmitted across the throttle gap to the ring projection of the compensating piston and thus benefits the compensating effect, although the throttle ring is not firmly connected to the shaft.
- the outer diameter of the end face of the throttle ring involved in the formation of the radial throttle gap is preferably larger than the diameter of the circumference of the throttle ring which cooperates with the housing bore. This is achieved by means of an annular projection or flange provided on the throttle ring, which is acted upon on the side of the throttle gap by the possibly higher gap pressure influenced by the pressure side and on its rear side by the low pressure. As a result, the size of the throttle gap can be set reliably for given operating conditions.
- FIG. 1 shows a section through that part of a multistage centrifugal pump which contains the relief piston; the representation in the lower half shows the arrangement of the relief piston according to conventional technology, while the upper half shows the embodiment according to the invention, and FIG. 2 shows a partial section through the relief piston and the associated housing part.
- the shaft 1, which carries the impellers of the pump stages 2, is axially fixed in the housing, a part of which can be seen at 3, in a manner not shown.
- the relief piston device is provided between a space 4 of the pump which is subjected to high pressure "H” and a space 5 in which the pressure is lower "N".
- This arrangement is formed by the relief piston 5 and the fixed housing part 7, which cooperate via a cylindrical throttle gap 8.
- the relief piston 6 is fixed on the shaft 1. Its cross-sectional area is dimensioned such that the differential pressure acting thereon gives the desired relief force.
- the annular gap 8 generally has a width of a few tenths of a millimeter and a considerable axial length in order to reduce the leakage current.
- the relief piston 10 has a smaller diameter. At the low-pressure end, it is provided with a flange-like, radial annular projection 11.
- the relief piston 10 is surrounded by the hollow cylindrical throttle ring 12, which includes an annular gap 13 with the cylindrical peripheral surface of the relief piston 10, which has a radial width of a few tenths of a millimeter. Its cylindrical circumferential surface is guided in the cylindrical bore 14 of the fixed housing part 15, the game being dimensioned such that it can move axially freely under all operating conditions.
- a sealing ring 16 is expediently provided on this side of the throttle ring. This is not necessary if the play between the throttle ring and the housing bore is so small that the leakage current flowing through it is negligible.
- the throttle ring 12 carries an annular projection 17, which is axially movable but non-rotatably pinned to the fixed housing part 15 at 18.
- the end face of the ring projection 11 of the relief piston 12 facing the high pressure side, on the one hand, and the end face of the ring projection 17 of the throttle ring 12 on the low pressure side enclose the throttle gap 21 through which there is a radial flow. They do not have to be exactly radial, but have a considerable radial component. They are essentially parallel to one another. Deviations from the Parallelism can be caused, for example, by a wedge shape that becomes narrower in the direction of flow (see Schneider loc. Cit.).
- the throttle gap does not have to extend over the entire radial extent of the end faces mentioned; rather, the end face distance in the radially inner region can be larger, as is shown at 19 in FIG.
- the actual throttle gap then begins a little further radially outwards, the transition either being gradual (as in FIG. 2) or gradually taking place.
- a spring 20, which urges the radial throttle end faces towards one another, is not excluded, but is generally not necessary.
- a spring can even be provided which forces the throttle end faces apart in order to prevent solid-state contact when the machine starts up.
- the throttle effect in the annular gap 13 contributes to the stabilization of the radial throttle gap.
- the throttling effect in the annular gap 13 is expediently between 10 and 50% of the total differential pressure.
- the leakage current in the area of the relief piston can be reduced to less than half of the previously usual amount. This can increase the overall efficiency by several points.
- the relief piston 10 shown in FIG. 1 above has a smaller outside diameter than in the prior art case shown below, the compensating effect is the same if the outside diameter of the throttle ring 12 is equal to the outside diameter of the be ⁇ known relief piston 6 is. This is because the differential force acting on the throttle ring 12 is also transmitted to the relief piston 10 via the ring projections 11 and 17 and the throttle gap 21.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Hydraulic Motors (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/704,599 US5713720A (en) | 1995-01-18 | 1996-01-17 | Turbo-machine with a balance piston |
DE59600941T DE59600941D1 (de) | 1995-01-18 | 1996-01-17 | Strömungsmaschine mit entlastungskolben |
EP96900592A EP0750720B1 (de) | 1995-01-18 | 1996-01-17 | Strömungsmaschine mit entlastungskolben |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29500744.3 | 1995-01-18 | ||
DE29500744U DE29500744U1 (de) | 1995-01-18 | 1995-01-18 | Strömungsmaschine mit Entlastungskolben |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996022468A1 true WO1996022468A1 (de) | 1996-07-25 |
Family
ID=8002649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1996/000185 WO1996022468A1 (de) | 1995-01-18 | 1996-01-17 | Strömungsmaschine mit entlastungskolben |
Country Status (4)
Country | Link |
---|---|
US (1) | US5713720A (de) |
EP (1) | EP0750720B1 (de) |
DE (2) | DE29500744U1 (de) |
WO (1) | WO1996022468A1 (de) |
Families Citing this family (44)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19927135A1 (de) * | 1999-06-15 | 2000-12-21 | Ksb Ag | Entlastungseinrichtung für mehrstufige Kreiselpumpen |
DE10038586A1 (de) * | 2000-08-03 | 2002-02-14 | Ksb Ag | Axialschubausgleichseinrichtung |
DE50206223D1 (de) * | 2001-10-22 | 2006-05-18 | Sulzer Pumpen Ag | Wellenabdichtungsanordnung für eine Pumpe zur Förderung heisser Fluide |
DE10254041B4 (de) * | 2002-11-20 | 2011-07-07 | KSB Aktiengesellschaft, 67227 | Verfahren und Vorichtung zur Störungsfrüherkennung bei Kreiselpumpen |
US8075668B2 (en) | 2005-03-29 | 2011-12-13 | Dresser-Rand Company | Drainage system for compressor separators |
US8434998B2 (en) * | 2006-09-19 | 2013-05-07 | Dresser-Rand Company | Rotary separator drum seal |
WO2008036394A2 (en) | 2006-09-21 | 2008-03-27 | Dresser-Rand Company | Separator drum and compressor impeller assembly |
WO2008039734A2 (en) | 2006-09-25 | 2008-04-03 | Dresser-Rand Company | Coupling guard system |
EP2066983B1 (de) | 2006-09-25 | 2013-12-11 | Dresser-Rand Company | Kompressorbefestigungssystem |
EP2066949B1 (de) | 2006-09-25 | 2013-08-28 | Dresser-Rand Company | Axial beweglicher spulenanschluss |
BRPI0718451A2 (pt) | 2006-09-25 | 2013-11-26 | Dresser Rand Co | Defletor de fluido para dispositivos separadores de fluido |
BRPI0717571B1 (pt) | 2006-09-25 | 2018-11-27 | Dresser Rand Co | carretel de conexão para conectar um invólucro do compressor com um invólucro do acionador de um sistema de compressão industrial |
EP2066422B1 (de) | 2006-09-26 | 2012-06-27 | Dresser-Rand Company | Verbesserte statische flüssigkeitstrennungsvorrichtung |
WO2009111616A2 (en) | 2008-03-05 | 2009-09-11 | Dresser-Rand Company | Compressor assembly including separator and ejector pump |
US7922218B2 (en) | 2008-06-25 | 2011-04-12 | Dresser-Rand Company | Shear ring casing coupler device |
US8079805B2 (en) | 2008-06-25 | 2011-12-20 | Dresser-Rand Company | Rotary separator and shaft coupler for compressors |
US8062400B2 (en) | 2008-06-25 | 2011-11-22 | Dresser-Rand Company | Dual body drum for rotary separators |
IT1392143B1 (it) * | 2008-09-15 | 2012-02-22 | Pompe Garbarino S P A | Pompa centrifuga multistadio con tamburo di bilanciamento idraulico a trafilamento controllato. |
US8061970B2 (en) * | 2009-01-16 | 2011-11-22 | Dresser-Rand Company | Compact shaft support device for turbomachines |
EP2394029A2 (de) * | 2009-02-05 | 2011-12-14 | Siemens Aktiengesellschaft | Turbomaschine mit einem ausgleichskolben |
IT1393311B1 (it) * | 2009-03-19 | 2012-04-20 | Turboden Srl | Turbina per espansione di gas/vapore con mezzi di contrasto della spinta assiale sull'albero di uscita |
US8210804B2 (en) | 2009-03-20 | 2012-07-03 | Dresser-Rand Company | Slidable cover for casing access port |
US8087901B2 (en) | 2009-03-20 | 2012-01-03 | Dresser-Rand Company | Fluid channeling device for back-to-back compressors |
US8061972B2 (en) | 2009-03-24 | 2011-11-22 | Dresser-Rand Company | High pressure casing access cover |
EP2478229B1 (de) | 2009-09-15 | 2020-02-26 | Dresser-Rand Company | Kompakte trennvorrichtung auf basis erhöhter dichte |
US20110097216A1 (en) * | 2009-10-22 | 2011-04-28 | Dresser-Rand Company | Lubrication system for subsea compressor |
BR112012020085B1 (pt) | 2010-02-10 | 2020-12-01 | Dresser-Rand Company | aparelho de coleta para um separador e método de separação |
IT1399881B1 (it) * | 2010-05-11 | 2013-05-09 | Nuova Pignone S R L | Configurazione di tamburo di bilanciamento per rotori di compressore |
US8663483B2 (en) | 2010-07-15 | 2014-03-04 | Dresser-Rand Company | Radial vane pack for rotary separators |
US8673159B2 (en) | 2010-07-15 | 2014-03-18 | Dresser-Rand Company | Enhanced in-line rotary separator |
US8657935B2 (en) | 2010-07-20 | 2014-02-25 | Dresser-Rand Company | Combination of expansion and cooling to enhance separation |
WO2012012143A2 (en) | 2010-07-21 | 2012-01-26 | Dresser-Rand Company | Multiple modular in-line rotary separator bundle |
WO2012033632A1 (en) | 2010-09-09 | 2012-03-15 | Dresser-Rand Company | Flush-enabled controlled flow drain |
WO2013109235A2 (en) | 2010-12-30 | 2013-07-25 | Dresser-Rand Company | Method for on-line detection of resistance-to-ground faults in active magnetic bearing systems |
US8994237B2 (en) | 2010-12-30 | 2015-03-31 | Dresser-Rand Company | Method for on-line detection of liquid and potential for the occurrence of resistance to ground faults in active magnetic bearing systems |
US9551349B2 (en) | 2011-04-08 | 2017-01-24 | Dresser-Rand Company | Circulating dielectric oil cooling system for canned bearings and canned electronics |
US8876389B2 (en) | 2011-05-27 | 2014-11-04 | Dresser-Rand Company | Segmented coast-down bearing for magnetic bearing systems |
US8851756B2 (en) | 2011-06-29 | 2014-10-07 | Dresser-Rand Company | Whirl inhibiting coast-down bearing for magnetic bearing systems |
DE102013223806A1 (de) * | 2013-11-21 | 2015-05-21 | Ksb Aktiengesellschaft | Entlastungseinrichtung |
DE102014016476A1 (de) * | 2014-11-07 | 2016-05-12 | Man Diesel & Turbo Se | Strömungsmaschine |
EP3412915B1 (de) | 2017-06-09 | 2019-12-25 | Xylem Europe GmbH | Selbsteinstellendes trommelsystem |
JP2022068479A (ja) * | 2020-10-22 | 2022-05-10 | 三菱重工コンプレッサ株式会社 | 回転機械及びギアド圧縮機 |
EP4030065A1 (de) * | 2021-01-13 | 2022-07-20 | Sulzer Management AG | Rotationspumpe mit axialschub-entlastungskolben und regelung einer leckageströmung |
US11971046B2 (en) * | 2022-02-11 | 2024-04-30 | Sulzer Management Ag | Rotary pump for conveying a fluid |
Citations (2)
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 |
DE1453787A1 (de) * | 1962-05-16 | 1969-05-08 | Klein Schanzlin & Becker Ag | Achsschubentlastungseinrichtung fuer Kreiselpumpen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH669241A5 (de) * | 1985-11-27 | 1989-02-28 | Sulzer Ag | Axialschub-ausgleichsvorrichtung fuer fluessigkeitspumpe. |
US5104284A (en) * | 1990-12-17 | 1992-04-14 | Dresser-Rand Company | Thrust compensating apparatus |
CH684495A5 (de) * | 1991-09-04 | 1994-09-30 | Escher Wyss Ag | Turbomaschine. |
DE4313455A1 (de) * | 1993-04-24 | 1994-10-27 | Klein Schanzlin & Becker Ag | Radialer Spalt, beispielsweise einer Strömungsmaschine |
FI940630A (fi) * | 1994-02-11 | 1995-08-12 | Ahlstroem Oy | Keskipakopumppu |
-
1995
- 1995-01-18 DE DE29500744U patent/DE29500744U1/de not_active Expired - Lifetime
-
1996
- 1996-01-17 DE DE59600941T patent/DE59600941D1/de not_active Expired - Lifetime
- 1996-01-17 WO PCT/EP1996/000185 patent/WO1996022468A1/de active IP Right Grant
- 1996-01-17 EP EP96900592A patent/EP0750720B1/de not_active Expired - Lifetime
- 1996-01-17 US US08/704,599 patent/US5713720A/en not_active Expired - Lifetime
Patent Citations (2)
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 |
DE1453787A1 (de) * | 1962-05-16 | 1969-05-08 | Klein Schanzlin & Becker Ag | Achsschubentlastungseinrichtung fuer Kreiselpumpen |
Also Published As
Publication number | Publication date |
---|---|
EP0750720A1 (de) | 1997-01-02 |
EP0750720B1 (de) | 1998-12-09 |
DE59600941D1 (de) | 1999-01-21 |
DE29500744U1 (de) | 1996-05-15 |
US5713720A (en) | 1998-02-03 |
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