EP0528845A1 - Single-blade impeller for rotary pumps. - Google Patents
Single-blade impeller for rotary pumps.Info
- Publication number
- EP0528845A1 EP0528845A1 EP91908572A EP91908572A EP0528845A1 EP 0528845 A1 EP0528845 A1 EP 0528845A1 EP 91908572 A EP91908572 A EP 91908572A EP 91908572 A EP91908572 A EP 91908572A EP 0528845 A1 EP0528845 A1 EP 0528845A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- paddle wheel
- angle
- degrees
- wheel according
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/225—Channel wheels, e.g. one blade or one flow channel
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
- F04D29/245—Geometry, shape for special effects
Definitions
- the invention relates to an impeller for centrifugal pumps for conveying liquids mixed with solid admixtures, in particular for conveying dirty water with long-fiber constituents, with a channel between the front and rear cover plates of the impeller and the blade, the strength of which changes over the extent thereof is formed.
- centrifugal pumps with paddle wheels are operated at a constant drive speed.
- the delivery conditions of such a centrifugal pump are usually subject to constant change.
- the inlet height fluctuates between a maximum and a minimum value.
- the operating point of the centrifugal pump i.e. the intersection between the constant pump characteristic and the variable system characteristic, is therefore also subject to the change.
- the shift in the operating point now involves both a change in the relative blade inflow velocity and a change in the relative inflow direction. This results in a static pressure distribution along the blade contour, which is specific for the respective blade shape.
- the integration of the pressure distribution from the blade inlet to the blade outlet edge results in a blade force that rotates relative to a fixed reference point as a deflecting transverse force.
- This transverse force which is also referred to as hydrodynamic buoyancy, forms a harmonically acting excitation force, which in a system capable of oscillation, ie, for example, B. a system that can cause major problems. It should therefore be kept as small as possible.
- the US-PS 17 54 992 deals with the problem of balancing the mass imbalance on a single or single channel.
- the cited patent provides two measures: First, the blade forming the channel has a continuously decreasing thickness over its extension, so that, despite the asymmetrical mass distribution, an overall relatively low mass unbalance is caused. Second, a counterweight is used on the back of the impeller to balance the mass. As A possible third measure is the arrangement of cavities on the rear side of the paddle wheel, wherein the location can be varied to optimize the unbalance compensation.
- the object is achieved according to the invention in that the blade angle measured on the skeleton line of the blade is 0 degrees or smaller from the entrance to at least 90 degrees of the angle of rotation, while the blade angle at the outlet is positive.
- Fig. 1 shows an axial section through an impeller designed according to the invention and in
- FIG. 2 shows a radial section through the impeller of FIG. 1st
- the paddle wheel produced by a casting process forms a channel (4) between a front cover plate (1), a rear cover plate (2) and a blade (3), the cross section of which decreases from the inlet (5) of the paddle wheel to the outlet (6).
- the blade (3) equipped with a suction side (7) and a pressure side (8) has a flattened blade head (9).
- a stagnation point flow results on a blade head with a very large rounded radius, which has a repellent effect on solids contained in the flow medium.
- the flattening which in the limit case has an infinitely large rounding radius, prevents the attachment of long-fiber components.
- the paddle wheel is designed so that the suction side of the paddle forms a semicircle concentrically to the axis of rotation of the paddle wheel for the first 180 degrees of the angle of rotation.
- the blade angle ⁇ measured from the blade head (9), the entry (5) into the impeller is up to 180 ° of the angle of rotation less than 0 °, measured on the skeleton line (10) of the blade (3). while it is positive at the outlet (6), that is in the area of the blade end (11).
- the suction side (7) of the blade (3) forms a semicircle with the radius r, which is arranged concentrically to the axis of rotation of the impeller.
- the blade (3) has a continuously decreasing thickness towards the outlet. It therefore has a mass distribution that is favorable for the imbalance behavior of the impeller. This advantage can be determined for the impeller as a whole, since it does not have large accumulations of material, particularly in the outer circumferential area.
- the suction side (7) and the pressure side (8) of the blade (3) run axially parallel over their entire extent, with a rounding into the cover disks (1) and (2).
- the radius of such a rounding corresponds here to approximately one third of the width of the channel (4) at the outlet (6). It can be up to half the channel width at the outlet (6) of the paddle wheel.
- the paddle wheel according to the invention has a comparatively uncomplicated shape. It is therefore not only easy to pour, it can also be produced in sheet metal construction, which above all brings additional advantages with regard to the unbalance behavior.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
L'invention concerne une roue à aube pour pompes centrifuges destinées à l'extraction de liquides chargés d'impuretés solides, notamment à l'extraction d'eaux polluées chargées de constituants à fibres longues, dans laquelle un canal (4) est formé entre le disque de recouvrement avant (1) et le disque de recouvrement arrière (2) de la roue à aube, et l'aube, dont l'épaisseur varie sur toute son étendue. Outre les exigences courantes formulées pour satisfaire l'absence d'engorgements, l'obtention de valeurs aussi faibles que possible du balourd mécanique et de la poussée hydrodynamique, ainsi que l'obtention d'une réduction considérable de la cavitation préjudiciable à la rotation et au refoulement, l'invention prévoit que l'angle (beta) mesuré sur la ligne médiane (11) de l'aube (3), à partir de l'entrée (5) jusqu'à au moins 90 degrés de l'angle de rotation, est égal ou inférieur à 0 degré, tandis que l'angle de l'aube (beta) à la sortie (6) est positif.The invention relates to an impeller for centrifugal pumps intended for the extraction of liquids laden with solid impurities, in particular the extraction of polluted water laden with constituents of long fibers, in which a channel (4) is formed between the front cover disc (1) and the rear cover disc (2) of the impeller, and the blade, the thickness of which varies over its entire extent. In addition to the current requirements formulated to satisfy the absence of bottlenecks, obtaining values as low as possible of the mechanical unbalance and the hydrodynamic thrust, as well as obtaining a considerable reduction in cavitation detrimental to rotation and at the discharge, the invention provides that the angle (beta) measured on the center line (11) of the blade (3), from the inlet (5) to at least 90 degrees from the angle of rotation, is equal to or less than 0 degrees, while the angle of the blade (beta) at the exit (6) is positive.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4015331 | 1990-05-12 | ||
DE4015331A DE4015331A1 (en) | 1990-05-12 | 1990-05-12 | PADDLE WHEEL FOR CENTRIFUGAL PUMPS |
PCT/EP1991/000833 WO1991018210A1 (en) | 1990-05-12 | 1991-05-02 | Single-blade impeller for rotary pumps |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0528845A1 true EP0528845A1 (en) | 1993-03-03 |
EP0528845B1 EP0528845B1 (en) | 1995-07-19 |
Family
ID=6406293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91908572A Expired - Lifetime EP0528845B1 (en) | 1990-05-12 | 1991-05-02 | Single-blade impeller for rotary pumps |
Country Status (5)
Country | Link |
---|---|
US (1) | US5348444A (en) |
EP (1) | EP0528845B1 (en) |
AR (1) | AR244396A1 (en) |
DE (2) | DE4015331A1 (en) |
WO (1) | WO1991018210A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112069630A (en) * | 2020-11-11 | 2020-12-11 | 中国航发上海商用航空发动机制造有限责任公司 | Compressor, blade, two-dimensional blade profile design method of blade and computer equipment |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5263924A (en) * | 1991-09-25 | 1993-11-23 | Baxter International Inc. | Integrated low priming volume centrifugal pump and membrane oxygenator |
US5290236A (en) * | 1991-09-25 | 1994-03-01 | Baxter International Inc. | Low priming volume centrifugal blood pump |
US5890883A (en) * | 1997-03-19 | 1999-04-06 | The Cleveland Clinic Foundation | Rotodynamic pump with non-circular hydrodynamic bearing journal |
AU7360798A (en) * | 1997-09-24 | 1999-04-12 | Cleveland Clinic Foundation, The | Flow controlled blood pump system |
JP4713066B2 (en) * | 2003-07-18 | 2011-06-29 | 新明和工業株式会社 | Impeller and sewage treatment pump equipped therewith |
US7767159B2 (en) * | 2007-03-29 | 2010-08-03 | Victor Nikolaevich Glotov | Continuous flow sonic reactor and method |
JP5118951B2 (en) * | 2007-12-11 | 2013-01-16 | 新明和工業株式会社 | Centrifugal pump impeller and centrifugal pump |
DE102011007907B3 (en) * | 2011-04-21 | 2012-06-21 | Ksb Aktiengesellschaft | Impeller for centrifugal pumps |
WO2013120049A1 (en) | 2012-02-10 | 2013-08-15 | Randy Dixon | Rotary lobe pump with wiper blades |
DE102015213451B4 (en) | 2015-07-17 | 2024-02-29 | KSB SE & Co. KGaA | Centrifugal pump blade profile |
CN106837856B (en) * | 2017-03-14 | 2023-03-31 | 中交疏浚技术装备国家工程研究中心有限公司 | Design method of three-blade impeller of efficient wear-resistant dredge pump and impeller |
DE102017213507A1 (en) | 2017-08-03 | 2019-02-07 | KSB SE & Co. KGaA | Impeller for wastewater pump |
DE102017221930A1 (en) | 2017-12-05 | 2019-06-06 | KSB SE & Co. KGaA | Impeller for wastewater pump |
CN110513326B (en) * | 2019-08-27 | 2024-04-23 | 浙江理工大学 | Centrifugal pump impeller capable of actively controlling pressure pulsation |
CN112483461B (en) * | 2020-10-21 | 2022-07-22 | 南通大学 | Self-balancing method for radial force of single-blade centrifugal pump |
CN112811483B (en) * | 2021-01-06 | 2022-11-04 | 江苏大学 | Green sewage treatment plant |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE506117A (en) * | ||||
CH94909A (en) * | 1921-05-21 | 1922-06-01 | Peter Alfred | Channelless centrifugal pump, especially for pumping impure liquids with different specific weights. |
US1754992A (en) * | 1926-12-06 | 1930-04-15 | American Well Works | Centrifugal pump |
CH189936A (en) * | 1936-01-18 | 1937-03-31 | Bucher Guyer Ag Masch | Centrifugal pump for pumping liquid manure, sludge water and the like. |
US2272469A (en) * | 1939-12-23 | 1942-02-10 | Chicago Pump Co | Centrifugal pump |
DE1034031B (en) * | 1956-03-31 | 1958-07-10 | Amag Hilpert Pegnitzhuette A G | Channel wheel, in particular single-channel wheel for centrifugal pumps to convey sludge-containing waste water |
FR1274289A (en) * | 1960-11-29 | 1961-10-20 | Centrifugal pump with single duct rotor | |
DE2732863C3 (en) * | 1977-07-21 | 1980-04-17 | Balcke-Duerr Ag, 4030 Ratingen | Single-channel centrifugal pump for pumping wastewater |
US4575312B1 (en) * | 1982-06-02 | 1989-05-16 | Impeller | |
FI73501C (en) * | 1984-06-06 | 1987-10-09 | Sarlin Ab Oy E | Impeller at a pump. |
US4681508A (en) * | 1984-11-14 | 1987-07-21 | Kim Choong W | Supercavitation centrifugal pump |
DE3615686A1 (en) * | 1986-05-09 | 1987-11-12 | Klein Schanzlin & Becker Ag | CHANNEL WHEEL FOR CENTRIFUGAL PUMPS |
-
1990
- 1990-05-12 DE DE4015331A patent/DE4015331A1/en not_active Withdrawn
-
1991
- 1991-04-24 AR AR91319516A patent/AR244396A1/en active
- 1991-05-02 DE DE59106053T patent/DE59106053D1/en not_active Expired - Lifetime
- 1991-05-02 WO PCT/EP1991/000833 patent/WO1991018210A1/en active IP Right Grant
- 1991-05-02 US US07/945,966 patent/US5348444A/en not_active Expired - Lifetime
- 1991-05-02 EP EP91908572A patent/EP0528845B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9118210A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112069630A (en) * | 2020-11-11 | 2020-12-11 | 中国航发上海商用航空发动机制造有限责任公司 | Compressor, blade, two-dimensional blade profile design method of blade and computer equipment |
CN112069630B (en) * | 2020-11-11 | 2021-01-22 | 中国航发上海商用航空发动机制造有限责任公司 | Compressor, blade, two-dimensional blade profile design method of blade and computer equipment |
Also Published As
Publication number | Publication date |
---|---|
DE59106053D1 (en) | 1995-08-24 |
US5348444A (en) | 1994-09-20 |
EP0528845B1 (en) | 1995-07-19 |
AR244396A1 (en) | 1993-10-29 |
WO1991018210A1 (en) | 1991-11-28 |
DE4015331A1 (en) | 1991-11-14 |
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