CA2585171A1 - Impeller wheel - Google Patents
Impeller wheel Download PDFInfo
- Publication number
- CA2585171A1 CA2585171A1 CA002585171A CA2585171A CA2585171A1 CA 2585171 A1 CA2585171 A1 CA 2585171A1 CA 002585171 A CA002585171 A CA 002585171A CA 2585171 A CA2585171 A CA 2585171A CA 2585171 A1 CA2585171 A1 CA 2585171A1
- Authority
- CA
- Canada
- Prior art keywords
- impeller
- leading edges
- pump
- impeller wheel
- vanes
- 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.)
- Abandoned
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
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating
-
- 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
- F04D29/181—Axial flow rotors
- F04D29/183—Semi axial flow rotors
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
-
- 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
- F05D2210/00—Working fluids
- F05D2210/10—Kind or type
- F05D2210/11—Kind or type liquid, i.e. incompressible
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S417/00—Pumps
Abstract
The present invention relates to a pump impeller (12) of a centrifugal or half axial type to be used in a pump for pumping liquids, wherein the impeller is arranged with one or several vanes (18), that the vanes are attached to cover discs (12, 16) on each side, forming a so called closed impeller wheel, characterized in that the leading edges (40) of the vanes are swept backwards at the inlet opening (42) in one of the cover discs (16) of the impeller.
Description
IMPELLER WHEEL
TECHNICAL FIELD
The invention concerns a pump impeller and more precisely a pump impeller for centrifugal-or half axial pumps for pumping of fluids containing pollutants.
BACKGROUND OF THE INVENTION
In literature there are lot of types of pumps and pump impellers for this purpose described, all however having certain disadvantages. Above all, this concerns problems with wear, clogging and low efficiency.
Sewage water contains a lot of different types of pollutants, the amount and struct.ure of which depend on the season and type of area from which the water emanates. In cities plastic material, hygiene articles, textile etc are common, while industrial areas may produce wearing particles. Experience shows that the worst problems are rags and the like which stick to the leading edges of the vanes and become wound around the impeller hub. Such incidents cause frequent service intervals and a reduced efficiency.
In agriculture and pulp industry different kinds of special pumps are used, which should manage straw, grass, leaves and other types of organic material. For this purpose the leading edges of the vanes are swept backwards in order to cause the pollutants to be fed outwards to the periphery instead of getting stuck to the edges.
Differ-ent types of disintegration means are often used for cutting the material and making the flow more easily. Examples are shown in SE-435 952, SE-375 831 and LJS-A 4 347 035.
TECHNICAL FIELD
The invention concerns a pump impeller and more precisely a pump impeller for centrifugal-or half axial pumps for pumping of fluids containing pollutants.
BACKGROUND OF THE INVENTION
In literature there are lot of types of pumps and pump impellers for this purpose described, all however having certain disadvantages. Above all, this concerns problems with wear, clogging and low efficiency.
Sewage water contains a lot of different types of pollutants, the amount and struct.ure of which depend on the season and type of area from which the water emanates. In cities plastic material, hygiene articles, textile etc are common, while industrial areas may produce wearing particles. Experience shows that the worst problems are rags and the like which stick to the leading edges of the vanes and become wound around the impeller hub. Such incidents cause frequent service intervals and a reduced efficiency.
In agriculture and pulp industry different kinds of special pumps are used, which should manage straw, grass, leaves and other types of organic material. For this purpose the leading edges of the vanes are swept backwards in order to cause the pollutants to be fed outwards to the periphery instead of getting stuck to the edges.
Differ-ent types of disintegration means are often used for cutting the material and making the flow more easily. Examples are shown in SE-435 952, SE-375 831 and LJS-A 4 347 035.
In literature the designs of the pump impellers are described very generally, especially as regards the sweep of the leading edges of open impeller wheels.
Attempts to define the sweep of the leading edges for an open impeller wheel are described in e.g. EP 0916851 and EP 0916852.
Di.iring pumping where high lifting heights are required, for example in mines, closed pump impellers are often used, i.e. such with two cover discs, an upper and a lower as well as inteimediate vanes, because these types of iinpellers reduce the axial load on the pump in comparison to the open type impellers. On the other hand, closed impellers have a lesser lead-through, which means higher risk for clogging.
Regarding closed impeller wheels they are generally designed with leading edges placed in the central inlet such that they are rather straight as seen in the flow direction. It has been found that during use, and in particular when the liquid contains rather large quantities of abrasive pollution, there is considerable wear on the leading edges of the vanes. There is further a risk that pollutants such as rags, plastic bags and other elongated objects get stuck on the leading edges, thereby requiring cleaning of the pump.
BRIEF DESCRIF'TION OF THE INVENTION
The aim of the present invention is to remedy the above mentioned problems and in particular in connection with closed impeller wheels.
This aim is solved according to a main aspect of the invention by what, is characterized in claim 1. Preferable embodiments of the invention form the dependent claims.
According to a main aspect of the invention, it is characterized by an impeller wheel of a centrifugal or half axial type to be used in a pump for pumping liquids, wherein the impeller is arranged with one or several vanes, that the vanes are attached to cover discs on each side, forming a so called closed impeller wheel, characterized in that the leading edges of the vanes are swept backwards at the inlet opening in one of the cover discs of the impeller.
According to a fizrther aspect of the invention, it is characterized in that the leading edges co-operate with cutting means arranged in a central inlet opening of the pump.
Preferably the leading edges protrude somewhat out of the inlet opening, and that the cutting means constitute at least one narrowing section of the gap between the central inlet opening of the pump and the leading ledges of the impeller, whereby, when the leading edges sweep past these sections during operation, a cutting action is obtained there between.
By designing the leading edges of the vanes strongly backswept it has been found that the wear on these edges are reduced drastically. The design also reduces the risk of material getting stuck on the edges. Rather such material are fed towards the periphery.
The material that however tends to get stuck on the edges at the inlet opening of the impeller will be cut by the cutting means. In a preferred embodiment the leading edge of the vanes co-operate with two narrowing parts of the inlet opening of the pump housing.
For a good performance regarding the pump function and transportation of material towards the periphery, the sweep angle a should be in the region 40 - 60 and the sweeping of the leading edges may generally follow the curvature of a logarithmic spiral.
Attempts to define the sweep of the leading edges for an open impeller wheel are described in e.g. EP 0916851 and EP 0916852.
Di.iring pumping where high lifting heights are required, for example in mines, closed pump impellers are often used, i.e. such with two cover discs, an upper and a lower as well as inteimediate vanes, because these types of iinpellers reduce the axial load on the pump in comparison to the open type impellers. On the other hand, closed impellers have a lesser lead-through, which means higher risk for clogging.
Regarding closed impeller wheels they are generally designed with leading edges placed in the central inlet such that they are rather straight as seen in the flow direction. It has been found that during use, and in particular when the liquid contains rather large quantities of abrasive pollution, there is considerable wear on the leading edges of the vanes. There is further a risk that pollutants such as rags, plastic bags and other elongated objects get stuck on the leading edges, thereby requiring cleaning of the pump.
BRIEF DESCRIF'TION OF THE INVENTION
The aim of the present invention is to remedy the above mentioned problems and in particular in connection with closed impeller wheels.
This aim is solved according to a main aspect of the invention by what, is characterized in claim 1. Preferable embodiments of the invention form the dependent claims.
According to a main aspect of the invention, it is characterized by an impeller wheel of a centrifugal or half axial type to be used in a pump for pumping liquids, wherein the impeller is arranged with one or several vanes, that the vanes are attached to cover discs on each side, forming a so called closed impeller wheel, characterized in that the leading edges of the vanes are swept backwards at the inlet opening in one of the cover discs of the impeller.
According to a fizrther aspect of the invention, it is characterized in that the leading edges co-operate with cutting means arranged in a central inlet opening of the pump.
Preferably the leading edges protrude somewhat out of the inlet opening, and that the cutting means constitute at least one narrowing section of the gap between the central inlet opening of the pump and the leading ledges of the impeller, whereby, when the leading edges sweep past these sections during operation, a cutting action is obtained there between.
By designing the leading edges of the vanes strongly backswept it has been found that the wear on these edges are reduced drastically. The design also reduces the risk of material getting stuck on the edges. Rather such material are fed towards the periphery.
The material that however tends to get stuck on the edges at the inlet opening of the impeller will be cut by the cutting means. In a preferred embodiment the leading edge of the vanes co-operate with two narrowing parts of the inlet opening of the pump housing.
For a good performance regarding the pump function and transportation of material towards the periphery, the sweep angle a should be in the region 40 - 60 and the sweeping of the leading edges may generally follow the curvature of a logarithmic spiral.
In all an impeller wheel with improved performance and wear resistance is obtained, leading to long operation cycles between maintenance and service.
These and other aspects of and advantages with the present invention will become apparent from the following detailed description and from the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed description of the invention, reference will be made to the drawings, of which Fig. 1 is an axial cross-section through a pump according to the invention, Fig. 2a is a perspective view from above of an impeller wheel comprising the present invention, Fig. 2b is a view corresponding to Fig. 2a from below, Fig. 3 is a view from below of the impeller wheel of Fig. 2, and Fig. 4 is a bottom plate to be mounted in a pump and co-operating with the impeller wheel according to Fig. 1.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 shows an impeller wheel of the closed type mounted in a pump comprising a drive shaft 10 connected to an electrical motor (not shown) for driving the pump. To the lower end of the shaft a pump impeller 12 is mounted, comprising upper 14 and lower 16 cover discs, vanes 18 and back vanes 19. The above mentioned components are mounted in a pump housing 20, having a bottom wall 22, an inlet 24 and an outlet 26. The pump impeller 12 is mounted such in the pump housing that there is a gap 28 between the 5 peripheral surface of the lower cover disc 16 and an inner side wall of the ptimp housing 20, a space 29 between the lower disc and the bottom wall as well as a gap 30 between a lower surface of the lower cover disc 16 and an upper surface of the bottom wall 22.
Aceording to the principles for a centrifugal pump, the liquid is sucked in axially through the inlet 24 and leaves the pump through the outlet 26 according to flow arrows A, B and C.
According to the present invention the vanes 18 are designed such that the leading edges 40 are swept strongly backwards at the inlet opening 42 of the impeller wheel, in relation to the direction of rotation R. The sweep angle coltld be increased from the hub and outwards. The sweep of the leading edges could be defined by a logarithmic spiral where the sweep angle a is rc/2 -(3, where (3 is the angle of the logarithmic spiral. Preferably the sweep angle should be in the region 40 - 60 .
At the inlet opening of the impeller the leading edges are placed generally in a plane perpendicular to the axis of rotation 10 of the impeller. The advantage with this design is to make sure that pollutants slide towards the periphery instead of getting stuck on the edges. It has further been shown that the wear on the leading edges are reduced when they have this configuration instead of the conventional design.
These and other aspects of and advantages with the present invention will become apparent from the following detailed description and from the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed description of the invention, reference will be made to the drawings, of which Fig. 1 is an axial cross-section through a pump according to the invention, Fig. 2a is a perspective view from above of an impeller wheel comprising the present invention, Fig. 2b is a view corresponding to Fig. 2a from below, Fig. 3 is a view from below of the impeller wheel of Fig. 2, and Fig. 4 is a bottom plate to be mounted in a pump and co-operating with the impeller wheel according to Fig. 1.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 shows an impeller wheel of the closed type mounted in a pump comprising a drive shaft 10 connected to an electrical motor (not shown) for driving the pump. To the lower end of the shaft a pump impeller 12 is mounted, comprising upper 14 and lower 16 cover discs, vanes 18 and back vanes 19. The above mentioned components are mounted in a pump housing 20, having a bottom wall 22, an inlet 24 and an outlet 26. The pump impeller 12 is mounted such in the pump housing that there is a gap 28 between the 5 peripheral surface of the lower cover disc 16 and an inner side wall of the ptimp housing 20, a space 29 between the lower disc and the bottom wall as well as a gap 30 between a lower surface of the lower cover disc 16 and an upper surface of the bottom wall 22.
Aceording to the principles for a centrifugal pump, the liquid is sucked in axially through the inlet 24 and leaves the pump through the outlet 26 according to flow arrows A, B and C.
According to the present invention the vanes 18 are designed such that the leading edges 40 are swept strongly backwards at the inlet opening 42 of the impeller wheel, in relation to the direction of rotation R. The sweep angle coltld be increased from the hub and outwards. The sweep of the leading edges could be defined by a logarithmic spiral where the sweep angle a is rc/2 -(3, where (3 is the angle of the logarithmic spiral. Preferably the sweep angle should be in the region 40 - 60 .
At the inlet opening of the impeller the leading edges are placed generally in a plane perpendicular to the axis of rotation 10 of the impeller. The advantage with this design is to make sure that pollutants slide towards the periphery instead of getting stuck on the edges. It has further been shown that the wear on the leading edges are reduced when they have this configuration instead of the conventional design.
Further, the leading edges protrude somewhat out of the central opening of the ilnpeller, Fig. 1. The edge parts 44 of the vanes protruding above the bottom surface of the lower- cover- disc 16 can be arranged to co-operate with the edge part 46 of the stationary inlet 24 of the housing arranged in a bottom plate 22. The circular inlet is thus arranged with two oppositely ar-ranged straight parts 50 whereby the gap between the vanes and the edge part of the inlet becomes very small. Elongated pollution such as rags, plastic bags and the like that have been stuck on the leading edges of the vanes will be cut here.
In total the design of the leading edges being swept and protruding somewhat, and co-operating with the opening of the bottom plate, greatly 1-educes the r-isk of pollutants getting stuck and reduces the wear on the leading edges.
It is to be understood that the embodiment described above and shown in the drawings is to be regar-ded as a non-limiting example of the invention and that it may be modified within the scope of the patent claims.
In total the design of the leading edges being swept and protruding somewhat, and co-operating with the opening of the bottom plate, greatly 1-educes the r-isk of pollutants getting stuck and reduces the wear on the leading edges.
It is to be understood that the embodiment described above and shown in the drawings is to be regar-ded as a non-limiting example of the invention and that it may be modified within the scope of the patent claims.
Claims (7)
1. An impeller wheel (12) of a centrifugal or half axial type to be used in a pump for- pumping liquids, wherein the impeller is arranged with one or several vanes (18), that the vanes are attached to cover discs (14, 16) on each side, forming a so called closed impeller wheel, charac terized in that the leading edges (40) of the vanes are swept backwards at the inlet opening (42) in one of the cover discs (16) of the impeller- in relation to the direction of rotation (R), said leading edges (40) being placed generally in a plane perpendicular to the axis of rotation (10) of the impeller (12) at the inlet opening (42).
2. Impeller wheel according to claim 1, wherein the leading edges (44) protrude somewhat out of the inlet opening (42), arranged and capable of co-operating with cutting means (50) arranged in a central inlet opening of the pump.
3. Impeller wheel according to claim 2, wherein the cutting means constitute at least one narrowing section of the gap between the central inlet opening of the pump and the leading ledges (40) of the impeller.
4. Impeller wheel according to any of the preceding claims, wherein the leading edges (40) are swept generally corresponding to a logarithmic spiral.
5. Impeller wheel according to claim 4, wherein a sweep angle (a) of the leading edges (40) is II/2 -.beta., where .beta. is the angle of the logarithmic spiral.
6. Impeller wheel according to any of the preceding claims, wherein the sweep angle (a) of the leading edges (40) are in the region 40 - 60°.
7. Pump comprising an impeller wheel according to any of the claims 1-3.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0402840A SE527558C2 (en) | 2004-11-19 | 2004-11-19 | Impeller |
| SE0402840-3 | 2004-11-19 | ||
| PCT/EP2005/055726 WO2006053831A1 (en) | 2004-11-19 | 2005-11-03 | Impeller wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2585171A1 true CA2585171A1 (en) | 2006-05-26 |
Family
ID=33516498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002585171A Abandoned CA2585171A1 (en) | 2004-11-19 | 2005-11-03 | Impeller wheel |
Country Status (26)
| Country | Link |
|---|---|
| US (1) | US20090208336A1 (en) |
| EP (1) | EP1815144B8 (en) |
| JP (1) | JP4489119B2 (en) |
| KR (1) | KR20070086413A (en) |
| CN (1) | CN101061319A (en) |
| AP (1) | AP2173A (en) |
| AT (1) | ATE389809T1 (en) |
| AU (1) | AU2005305920B2 (en) |
| BR (1) | BRPI0518009A (en) |
| CA (1) | CA2585171A1 (en) |
| DE (1) | DE602005005515T2 (en) |
| DK (1) | DK1815144T3 (en) |
| EA (1) | EA009906B1 (en) |
| ES (1) | ES2304178T3 (en) |
| HK (1) | HK1106814A1 (en) |
| IL (1) | IL182816A0 (en) |
| MX (1) | MX2007005925A (en) |
| NO (1) | NO20073096L (en) |
| NZ (1) | NZ555389A (en) |
| PL (1) | PL1815144T3 (en) |
| PT (1) | PT1815144E (en) |
| SE (1) | SE527558C2 (en) |
| SI (1) | SI1815144T1 (en) |
| UA (1) | UA89653C2 (en) |
| WO (1) | WO2006053831A1 (en) |
| ZA (1) | ZA200704866B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2935761B1 (en) * | 2008-09-05 | 2010-10-15 | Alstom Hydro France | FRANCIS TYPE WHEEL FOR A HYDRAULIC MACHINE, A HYDRAULIC MACHINE COMPRISING SUCH A WHEEL AND A METHOD OF ASSEMBLING SUCH A WHEEL |
| DE102009011444A1 (en) * | 2009-03-03 | 2010-09-09 | Ksb Aktiengesellschaft | Free-flow impeller with cutting edges |
| JPWO2013015432A1 (en) * | 2011-07-25 | 2015-02-23 | 泰工技研工業株式会社 | Fluid machinery |
| WO2014205439A1 (en) * | 2013-06-21 | 2014-12-24 | Flow Control Llc. | Debris removing impeller backvane |
| JP6351216B2 (en) * | 2013-07-05 | 2018-07-04 | 株式会社荏原製作所 | Pump blade for submersible pump and submersible pump equipped with the same |
| CN103696982A (en) * | 2013-12-06 | 2014-04-02 | 江苏大学 | Sewage axial-flow pump impeller structure capable of automatically cutting fibers |
| JP6415116B2 (en) * | 2014-05-30 | 2018-10-31 | 株式会社荏原製作所 | Casing liner for sewage pump and sewage pump provided with the same |
| KR20180079505A (en) * | 2016-12-30 | 2018-07-11 | 명화공업주식회사 | Waterpump impeller |
| CN108916066A (en) * | 2018-07-13 | 2018-11-30 | 江苏大学 | A kind of environment protecting pump for conveying with particle and fiber |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2712412A (en) * | 1952-08-26 | 1955-07-05 | New Holland Machine Division O | Forage blower |
| US3447475A (en) * | 1967-01-09 | 1969-06-03 | Albert Blum | Centrifugal pump |
| US3958895A (en) * | 1975-02-07 | 1976-05-25 | Brisson Leonard L | Pump with shearing means |
| DE2612910A1 (en) * | 1976-03-26 | 1977-09-29 | Albert Blum | SEWAGE PUMP |
| CA1155712A (en) * | 1979-10-29 | 1983-10-25 | Rockwell International Corporation | Composite centrifugal impeller for slurry pumps |
| SE466766B (en) * | 1989-04-27 | 1992-03-30 | Flygt Ab Itt | Centrifugal pump intended for pumping of liquids containing solid particles, for example, rags and other long-stretched objects |
| US5438755A (en) * | 1993-11-17 | 1995-08-08 | Giberson; Melbourne F. | Method of making a monolithic shrouded impeller |
| SE520416C2 (en) * | 1997-11-18 | 2003-07-08 | Flygt Ab Itt | Impeller |
| SE512154C2 (en) * | 1997-11-18 | 2000-02-07 | Flygt Ab Itt | Impeller for centrifugal or semi-axial pumps intended to pump primarily wastewater |
| GB2371834B (en) * | 1999-10-06 | 2004-03-10 | Vaughan Co | Centrifugal pump improvements |
| US6276899B1 (en) * | 1999-11-05 | 2001-08-21 | Flowserve Management Company | Impeller manufacturing process |
| JP4358965B2 (en) * | 2000-03-27 | 2009-11-04 | 株式会社日立産機システム | Centrifugal impeller and air purifier |
| US20040136825A1 (en) * | 2001-08-08 | 2004-07-15 | Addie Graeme R. | Multiple diverter for reducing wear in a slurry pump |
| US20040234370A1 (en) * | 2002-09-26 | 2004-11-25 | Mark Simakaski | Chopping pump impeller assembly |
| EP1455094A1 (en) * | 2003-03-04 | 2004-09-08 | Ziehl-Abegg AG | Radial flow impeller |
-
2004
- 2004-11-19 SE SE0402840A patent/SE527558C2/en not_active IP Right Cessation
-
2005
- 2005-11-03 US US11/719,842 patent/US20090208336A1/en not_active Abandoned
- 2005-11-03 EA EA200701098A patent/EA009906B1/en not_active IP Right Cessation
- 2005-11-03 MX MX2007005925A patent/MX2007005925A/en active IP Right Grant
- 2005-11-03 DK DK05801669T patent/DK1815144T3/en active
- 2005-11-03 PL PL05801669T patent/PL1815144T3/en unknown
- 2005-11-03 EP EP05801669A patent/EP1815144B8/en active Active
- 2005-11-03 AP AP2007003998A patent/AP2173A/en active
- 2005-11-03 AU AU2005305920A patent/AU2005305920B2/en not_active Expired - Fee Related
- 2005-11-03 KR KR1020077013863A patent/KR20070086413A/en not_active Application Discontinuation
- 2005-11-03 CN CNA2005800395749A patent/CN101061319A/en active Pending
- 2005-11-03 PT PT05801669T patent/PT1815144E/en unknown
- 2005-11-03 UA UAA200706529A patent/UA89653C2/en unknown
- 2005-11-03 ES ES05801669T patent/ES2304178T3/en active Active
- 2005-11-03 ZA ZA200704866A patent/ZA200704866B/en unknown
- 2005-11-03 AT AT05801669T patent/ATE389809T1/en active
- 2005-11-03 SI SI200530263T patent/SI1815144T1/en unknown
- 2005-11-03 NZ NZ555389A patent/NZ555389A/en unknown
- 2005-11-03 JP JP2007541908A patent/JP4489119B2/en not_active Expired - Fee Related
- 2005-11-03 WO PCT/EP2005/055726 patent/WO2006053831A1/en active Application Filing
- 2005-11-03 BR BRPI0518009-0A patent/BRPI0518009A/en not_active IP Right Cessation
- 2005-11-03 CA CA002585171A patent/CA2585171A1/en not_active Abandoned
- 2005-11-03 DE DE602005005515T patent/DE602005005515T2/en active Active
-
2007
- 2007-04-26 IL IL182816A patent/IL182816A0/en unknown
- 2007-06-18 NO NO20073096A patent/NO20073096L/en not_active Application Discontinuation
- 2007-11-13 HK HK07112392A patent/HK1106814A1/en not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20121105 |