EP1568891A1 - Diffusor für zentrifugalverdichter und herstellungsverfahren dafür - Google Patents
Diffusor für zentrifugalverdichter und herstellungsverfahren dafür Download PDFInfo
- Publication number
- EP1568891A1 EP1568891A1 EP03777260A EP03777260A EP1568891A1 EP 1568891 A1 EP1568891 A1 EP 1568891A1 EP 03777260 A EP03777260 A EP 03777260A EP 03777260 A EP03777260 A EP 03777260A EP 1568891 A1 EP1568891 A1 EP 1568891A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diffuser
- diffuser blade
- blade
- centrifugal compressor
- suction surface
- 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- Withdrawn
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
-
- 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
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the present invention relates to a diffuser for a centrifugal compressor and a fabricating method and, in particular, to a diffuser for a centrifugal compressor and a fabricating method capable of reducing both the incidence loss.
- a centrifugal compressor is well known as a type of compressor for compressing and increasing the pressure of a gas.
- Fig. 1 is a sectional view of a centrifugal compressor comprising an impeller 12 mounted on a rotary shaft 11 and a casing 13.
- the casing 13 has formed therein an impeller accommodating portion, a diffuser portion and a spiral scroll.
- a blade 14 is mounted on the impeller 12, and the gas flowing in along the direction of arrow 15 is accelerated by the impeller 12 and flows out along the radial direction 16 of the centrifugal compressor.
- the diffuser portion on the outer periphery of the impeller 12 includes a diffuser blade 17 for converting the dynamic pressure of the fluid flowing out along the radial direction 16 into a static pressure.
- the diffuser blade 17 is mounted on an annular disk 18 fitted in the front inner wall of the diffuser portion of the casing 13, and the diffuser blade 17 extends toward the rear inner wall (along the height) of the diffuser portion in the casing.
- Fig. 2 is a perspective view of the conventional diffuser comprising a plurality of two-dimensional diffuser blade 17 mounted on the annular disk 18.
- the cross section A-A of the diffuser blade 17 is rectangular.
- the connection between each side wall of the diffuser blade 17 and the annular disk 18 is defined by an arcuate surface, and the curves connecting the center of the radius of curvature of the arcuate surfaces extend smoothly along the diffuser blade 17 and intersect to each other.
- a ridge line is formed by the intersection of the arcuate surfaces to prevent stalling and surging.
- This conventional diffuser blade is proposed and disclosed in, for example, Japanese Unexamined Patent Publication No. 10-77997.
- the gas flowing out of the impeller 12 flows into the diffuser portion in the direction of arrow 20.
- the angle between the velocity vector of the gas and an axis tangent to the circumference of the annular disk 18 is referred to as flow angle ⁇ .
- the distribution of the flow angle ⁇ along the height of the diffuser blade has a parabolic shape wherein the angle is substantially zero at one side where the diffuser blade 17 is mounted to the annular disk 18 (shroud end S) and at the other side rear the inner wall of the casing (hub end H), while the flow angle ⁇ is positive in the intermediate area therebetween.
- Fig. 3 is a graph showing the distribution of the flow angle along the height of the diffuser blade, in which the abscissa is the height of the diffuser blade and the ordinate is the flow angle ⁇ .
- Each diffuser blade 17 is mounted obliquely on the annular disk 18 in a direction (length direction) from the impeller of the diffuser mounted portion toward the scroll.
- the surface impinged by the gas flowing into the diffuser 17 is called a pressure surface, and the surface opposite to the pressure surface a suction surface.
- suction surface blade angle ⁇ ksuc section perpendicular to the flow direction at least in a throat portion and a portion upstream thereof.
- a diffuser for a centrifugal compressor comprising a suction surface which defines an acute angle, in a cross section perpendicular to the flow direction at least in a throat portion and a portion upstream thereof, in relation to at least one of a shroud surface and a hub surface.
- the suction surface is formed into a concave surface at least in the throat portion to suppress the generation of a boundary layer near the shroud surface and the hub surface.
- a method of fabricating a diffuser for a centrifugal compressor comprising the steps of fabricating a two-dimensional blade; and cutting one of the side surfaces of the blade, fabricated in the preceding step, into a concave shape with a ball end mill.
- the diffuser blade is fabricated by cutting one side surface of the diffuser blade having a two-dimensional shape with a ball end mill.
- FIG. 4A is a perspective view of a diffuser blade used in a diffuser according to the invention
- Figs. 4B to 4F are sectional views from the upstream side taken in lines I to V, respectively.
- a suction surface 401 of a diffuser blade 4 is formed into a concave surface toward an opposite pressure surface 402. Specifically, at least one of angle ⁇ H which is defined by the suction surface and inner wall of the casing near a hub end H and angle ⁇ S which is defined by the suction surface and, an annular disk near a shroud end S of the diffuser blade 4 is acute.
- the suction surface is formed as a concave surface toward the pressure surface.
- Fig. 5 is a graph showing the distribution of the flow angle along the height of the diffuser blade.
- Fig. 6 is a sectional view of a second diffuser blade according to the invention, which is configured of not a curved surface but of bent flat surfaces.
- Fig. 7A is a top plan view of the diffuser according to the invention, and Fig. 7B a sectional view of the diffuser blade along line B-B in Fig. 7A.
- the constant-pressure curves of the gas between the two diffuser blades 41, 42 are shown in Fig. 7A.
- Area between the normal line C-C to the center line along the length of the first diffuser blade 41 from the upstream end of the second diffuser blade 42 and the upstream end of the first diffuser blade 41 is defined as a throat
- the length from the upstream end of the first diffuser blade 41 to the normal line C-C is defined as a throat length XT.
- the pressure distribution is in the shape of a fan centered at the upstream end of the second diffuser blade 42.
- the pressure in the area “a” connecting the upstream ends of the blade is low, while the pressure in the area “b” connecting the upstream end of the second diffuser blade 42 and the center of the throat area of the first diffuser blade 42 is high.
- Fig. 7B is a sectional view along line B-B perpendicular to the center line along the length of the first diffuser blade 41 in the throat area.
- the gas pressure distribution is such that the higher the pressure, the nearer to the first diffuser blade 41.
- the gas develops a secondary flow 43 from the suction surface of the first diffuser blade 41 toward the pressure surface of the second diffuser blade 42.
- the boundary layer thickness on the suction surface of the first diffuser blade 41 near the hub end H and the shroud end S is reduced while. Therefore the incidence loss is reduced.
- the constant-pressure curves assume a form perpendicular to the center line along the length of the first diffuser blade 41 and the second diffuser blade 42. Therefore, the gas is prevented from flowing from the suction surface of the first diffuser blade 41 toward the pressure surface of the second diffuser blade 42.
- it is especially important to form a throat and a concave suction surface at upstream of the throat, while the portion downstream of the throat is not required to be formed into a concave shape.
- Figs. 8A to 8F are diagrams for explaining the steps of fabricating a diffuser blade according to this invention. First, a two-dimensional diffuser blade having a rectangular cross section is fabricated (Fig. 8A).
- the suction surface of the two-dimensional diffuser blade is cut with the ball end mill thereby to form a concave suction surface.
- a concave suction surface is formed by cutting along the other end (Fig. 8C).
- the angles ⁇ H and ⁇ S that the suction surface forms with the hub surface and the shroud surface, respectively, of the diffuser blade are acute.
- a two-dimensional diffuser blade has the greatest thickness at the longitudinally central portion thereof, and therefor the cross section of the diffuser blade according to the invention is symmetric longitudinally about the central portion (III) thereof.
- the cross section of the central portion (III) is shaped as shown in Fig. 8D.
- the cross sections of the portions (II) and (IV) are shaped as shown in Fig. 8E, and the cross sections of the portions (I) and (V) as shown in Fig. 8F.
- the embodiment of the invention described above refers to an application of the diffuser according to the invention to a centrifugal compressor. It is apparent, however, that the diffuser according to this invention is also applicable to a centrifugal blower and a centrifugal pump with equal effect.
- the boundary layer generated on the suction surface near the shroud end and the hub end of the diffuser blade is reduced, whereby the incidence loss is reduced.
- the diffuser blade can be easily fabricated by cutting a two-dimensional diffuser blade with a ball end mill.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002352327 | 2002-12-04 | ||
JP2002352327 | 2002-12-04 | ||
PCT/JP2003/015553 WO2004051091A1 (ja) | 2002-12-04 | 2003-12-04 | 遠心圧縮機用ディフューザ及びその製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1568891A1 true EP1568891A1 (de) | 2005-08-31 |
EP1568891A4 EP1568891A4 (de) | 2006-01-04 |
Family
ID=32463224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03777260A Withdrawn EP1568891A4 (de) | 2002-12-04 | 2003-12-04 | Diffusor für zentrifugalverdichter und herstellungsverfahren dafür |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050163610A1 (de) |
EP (1) | EP1568891A4 (de) |
JP (1) | JPWO2004051091A1 (de) |
WO (1) | WO2004051091A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007033275A1 (en) * | 2005-09-13 | 2007-03-22 | Ingersoll-Rand Company | Diffuser for a centrifugal compressor |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2958346B1 (fr) * | 2010-03-30 | 2012-04-20 | Turbomeca | Compresseur de turbomachine |
JP5766595B2 (ja) * | 2011-12-15 | 2015-08-19 | 三菱重工業株式会社 | 遠心ターボ機械 |
DE102015219556A1 (de) | 2015-10-08 | 2017-04-13 | Rolls-Royce Deutschland Ltd & Co Kg | Diffusor für Radialverdichter, Radialverdichter und Turbomaschine mit Radialverdichter |
JP2017096196A (ja) * | 2015-11-26 | 2017-06-01 | 三菱重工業株式会社 | 静止ベーンおよび当該静止ベーンを備えた遠心圧縮機 |
US10352237B2 (en) * | 2016-05-26 | 2019-07-16 | Rolls-Royce Corporation | Diffuser having shaped vanes |
DE102017101590A1 (de) * | 2017-01-27 | 2018-08-02 | Man Diesel & Turbo Se | Radialverdichter und Turbolader |
US11333171B2 (en) * | 2018-11-27 | 2022-05-17 | Honeywell International Inc. | High performance wedge diffusers for compression systems |
US10871170B2 (en) * | 2018-11-27 | 2020-12-22 | Honeywell International Inc. | High performance wedge diffusers for compression systems |
US11098730B2 (en) | 2019-04-12 | 2021-08-24 | Rolls-Royce Corporation | Deswirler assembly for a centrifugal compressor |
JP2021032106A (ja) * | 2019-08-22 | 2021-03-01 | 三菱重工業株式会社 | ベーンドディフューザ及び遠心圧縮機 |
KR102261509B1 (ko) * | 2019-11-28 | 2021-06-07 | 주식회사 인지니어스 | 고온 기체용 밀폐형 송풍기 |
US11441516B2 (en) | 2020-07-14 | 2022-09-13 | Rolls-Royce North American Technologies Inc. | Centrifugal compressor assembly for a gas turbine engine with deswirler having sealing features |
US11286952B2 (en) | 2020-07-14 | 2022-03-29 | Rolls-Royce Corporation | Diffusion system configured for use with centrifugal compressor |
US11578654B2 (en) | 2020-07-29 | 2023-02-14 | Rolls-Royce North American Technologies Inc. | Centrifical compressor assembly for a gas turbine engine |
CN112627980B (zh) * | 2020-11-16 | 2023-04-18 | 株洲丰发精工实业有限公司 | 一种用于航空发动机的扩压器及其加工方法 |
KR102372946B1 (ko) * | 2021-01-07 | 2022-03-10 | 주식회사 인지니어스 | 고체산화물 연료전지 발전시스템 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419669A (en) * | 1942-05-08 | 1947-04-29 | Fed Reserve Bank | Diffuser for centrifugal compressors |
US3719430A (en) * | 1971-08-24 | 1973-03-06 | Gen Electric | Diffuser |
US5529457A (en) * | 1994-03-18 | 1996-06-25 | Hitachi, Ltd. | Centrifugal compressor |
WO1999061801A1 (en) * | 1998-05-28 | 1999-12-02 | Ebara Corporation | Turbomachinery |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2708883A (en) * | 1950-03-03 | 1955-05-24 | Escher Wyss Ag | Arrangement for use in radial centrifugal compressors and pumps for the conversion of kinetic energy of the flowing medium into pressure energy |
US3778186A (en) * | 1972-02-25 | 1973-12-11 | Gen Motors Corp | Radial diffuser |
SE382342B (sv) * | 1973-06-18 | 1976-01-26 | United Turbine Ab & Co | Avloppsdiffusor for centrifugalkompressor |
DE2544612C3 (de) * | 1974-10-14 | 1980-04-10 | Leningradskoe Specialnoe Konstruktorskoe Bjuro Tyaschelych I Unikalnych Stankov, Leningrad (Sowjetunion) | Rundfräsverfahren |
US4027997A (en) * | 1975-12-10 | 1977-06-07 | General Electric Company | Diffuser for a centrifugal compressor |
US4260304A (en) * | 1979-10-10 | 1981-04-07 | Dresser Industries, Inc. | Method for machining an impeller cover |
JPS5771799U (de) * | 1980-10-21 | 1982-05-01 | ||
US4798518A (en) * | 1982-03-09 | 1989-01-17 | Wilhelm Gebhardt Gmbh | Fan unit for use with duct systems |
CH673244A5 (de) * | 1987-11-20 | 1990-02-28 | Starrfraesmaschinen Ag | |
JPH09502932A (ja) * | 1993-09-29 | 1997-03-25 | シーメンス アクチエンゲゼルシヤフト | 主軸に沿って延びたタービンブレード断面のフライス切削方法 |
US6077002A (en) * | 1998-10-05 | 2000-06-20 | General Electric Company | Step milling process |
-
2003
- 2003-12-04 JP JP2004556912A patent/JPWO2004051091A1/ja active Pending
- 2003-12-04 WO PCT/JP2003/015553 patent/WO2004051091A1/ja not_active Application Discontinuation
- 2003-12-04 EP EP03777260A patent/EP1568891A4/de not_active Withdrawn
- 2003-12-04 US US10/503,220 patent/US20050163610A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2419669A (en) * | 1942-05-08 | 1947-04-29 | Fed Reserve Bank | Diffuser for centrifugal compressors |
US3719430A (en) * | 1971-08-24 | 1973-03-06 | Gen Electric | Diffuser |
US5529457A (en) * | 1994-03-18 | 1996-06-25 | Hitachi, Ltd. | Centrifugal compressor |
WO1999061801A1 (en) * | 1998-05-28 | 1999-12-02 | Ebara Corporation | Turbomachinery |
Non-Patent Citations (1)
Title |
---|
See also references of WO2004051091A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007033275A1 (en) * | 2005-09-13 | 2007-03-22 | Ingersoll-Rand Company | Diffuser for a centrifugal compressor |
US7581925B2 (en) | 2005-09-13 | 2009-09-01 | Ingersoll-Rand Company | Diffuser for a centrifugal compressor |
Also Published As
Publication number | Publication date |
---|---|
US20050163610A1 (en) | 2005-07-28 |
JPWO2004051091A1 (ja) | 2006-03-30 |
EP1568891A4 (de) | 2006-01-04 |
WO2004051091A1 (ja) | 2004-06-17 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20040803 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
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A4 | Supplementary search report drawn up and despatched |
Effective date: 20051121 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Effective date: 20060111 |