EP3271587B1 - Impeller for centrifugal pumps - Google Patents
Impeller for centrifugal pumps Download PDFInfo
- Publication number
- EP3271587B1 EP3271587B1 EP16768970.2A EP16768970A EP3271587B1 EP 3271587 B1 EP3271587 B1 EP 3271587B1 EP 16768970 A EP16768970 A EP 16768970A EP 3271587 B1 EP3271587 B1 EP 3271587B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- disk element
- profile
- contoured
- rotation axis
- 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.)
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Links
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
-
- 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
-
- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/051—Axial thrust balancing
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/287—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps with adjusting means
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
Definitions
- the present invention relates to an impeller for centrifugal pumps, particularly of the type with one or more stages.
- a centrifugal pumps has an impeller conventionally made of a pair of shaped disk bodies facing each other so as to form a gap within which a series of vanes that connect the two disks are arranged.
- each impeller Centrally to each impeller there is a hub, or an equivalent coupling device, that allows to fasten the impeller to a transmission shaft that is turned by a motor means.
- impellers of the known type are widely used, they have drawbacks; among these, perhaps the most important is linked to the generation of axial thrusts.
- the impeller of a centrifugal pump is in fact subjected to different pressures that act on the two faces: a pressure lower than the atmospheric pressure generally acts on the inlet side, while a pressure substantially equal to the delivery pressure acts on the opposite face. This produces an axial thrust which can even be considerable, such as to create great losses in terms of efficiency and overloads that damage the bearings of the motor.
- the prior art also includes an impeller for centrifugal pumps disclosed in the Italian patent application no. ITVI2014A000271 , to this same applicant.
- Such impeller effectively solves the problems described above, but requires the provision of disk elements having different diameters.
- JP S54 072 501 A that describes a centrifugal, mixed flow pump that has a communicating slit on the periphery of a rear disc to introduce pressure water from outside to the inside of an impeller.
- Holes arranged in a hub disc along the trailing sides of rotor blades of an impeller are known from US3944406 A , US3541607 A , FR526862 , WO2010/110937 .
- the aim of the invention is to solve the problems described above, providing a impeller for centrifugal pumps that allows to reduce axial thrusts, at the same time ensuring maximum efficiency, and provides for the use of disk elements with the same diameter.
- a particular object of the invention is to provide an impeller that allows to solve the problems linked to the traction that is usually generated on the transmission shaft.
- Another object of the invention is to provide an impeller that allows to preserve the bearings of the motor.
- Another object of the invention is to provide an impeller that can be manufactured with a small number of components and is therefore advantageous also from a purely economic standpoint.
- the impeller inter alia comprises a first disk element, functionally arranged toward the inlet, which is coaxial to and faces a second disk element, which is functionally arranged toward the delivery; said second disk element being connected rigidly to said first disk element by angularly spaced vanes and being centrally provided with a fastening means for fastening to a transmission shaft; said impeller comprising specifically shaped and/or arranged openings formed iri the substantially peripheral region of said second disk element, between pairs of adjacent vanes, substantially at the areas subjected to the greatest axial thrust.
- the centrifugal pump comprises a substantially hollow body that accommodates at least one impeller according to claim 1 that is fastened to a transmission shaft which can be rotated about a rotation axis by a motor means.
- the impeller according to the invention allows to considerably reduce the axial thrusts but at the same time ensure maximum efficiency and head.
- the impeller according to the present invention allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
- FIGS 1 to 3 illustrate an impeller for a centrifugal pumps, globally designated by the reference numeral 1.
- impeller 1 is used in a multistage centrifugal pump; however, it is evident to the person skilled in the art that the impeller according to the present invention can also be fitted on pumps of another type, like single stage centrifugal pump.
- the multistage centrifugal pump which is per se known and is not shown in the figures, is constituted by a substantially hollow body that accommodates a set of impellers provided according to the present invention, which are coaxially fastened to a transmission shaft that is turned by a motor means.
- the impeller 1 includes a first disk element 2, which is functionally arranged towards the inlet, and a second disk element 3, which is functionally arranged towards the delivery.
- the diameter of the second disk element 3 is substantially equal to, or slightly smaller than, the diameter of the first disk element 2.
- the two disk elements 2 and 3 are coaxial to a rotation axis 1000 and face each other so as to form a substantially cylindrical interspace.
- Vanes 4 are arranged within the interspace and rigidly connect the first disk element 2 to the second disk element 3.
- the vanes 4 are curved so as to form ducts that diverge and are arranged radially.
- the second disk element 3 is fastened to a transmission shaft by means of a fastening means.
- the transmission shaft which is not shown in the figures, rotates about the rotation axis 1000.
- the fastening means comprises a hub 5, which can be associated mechanically with the transmission shaft, provided at the center of the second disk element 3.
- a through hole 6 is centrally provided on the first disk element 2, opposite to the hub 5; the through hole 6 has a diameter that is larger than that of the transmission shaft.
- the through hole 6 is connected to a collar 7 that protrudes from the first disk element 2.
- the collar 7 surrounds the shaft, forming an annular opening that constitutes the intake of the impeller.
- the impeller 1 includes a series of openings formed in the substantially peripheral region of the second disk element 3, between pairs of adjacent vanes 4, in which it is possible to identify the areas of the disk that are subject to the greatest axial thrust.
- each opening extends for a distance that is shorter than that of the peripheral edge of the second disk element 3, with respect to the rotation axis 1000.
- the openings are completely included within the profile of the second disk element 3.
- the openings are constituted by shaped slots 8 provided in the peripheral region of the second disk element 3, between pairs of adjacent vanes 4.
- Each contoured slot 8 has an arc-like profile 9, at the radially peripheral side; the arc-like profile 9 has a convexity facing the rotation axis 1000.
- the arc-like profile 9 is connected with an opposite contoured profile 10, which, in the example shown in Figures 1 to 3 , has a curved portion, with the convexity facing the rotation axis 1000.
- FIGs 4 to 6 show an impeller, generally designated by the reference numeral 101, which is similar to the impeller 1 but is provided with contoured profiles 110 with the convexity facing the outside of the second disk element 3.
- the impeller according to the invention is generally designated by the reference numeral 201
- the arc-like profiles 9 and the contoured profiles 10, of the contoured slots 8 are joined by one or more radially extended tabs 211 that have the function of stiffening the structure.
- the openings are constituted by through holes 308 provided in the substantially peripheral region of the second disk element 3, between pairs of adjacent vanes 4.
- the centers of the through holes 308 are arranged substantially along an arc of a circumference that is centered on the rotation axis 1000; however, it is evident to the person skilled in the art that the through holes might be arranged in other equivalent manners.
- figures 13 to 15 show an impeller, designated by the reference numeral 401, which is similar to the impeller 301 but has through holes 408 that are formed substantially along multiple arcs which are concentric and centered with respect to the rotation axis 1000.
- Figures 16 to 18 show an impeller, generally designated by the reference numeral 501, which includes through holes 508 provided in the second disk element 3, between pairs of adjacent vanes 4, and arranged substantially along arcs of a circumference the center of which is arranged outside the disk.
- the impeller according to the invention may be manufactured by means of various techniques, by using metallic materials such as, for example, steel, stainless steel, die-cast steel, cast iron, brass, and the like, or other materials provided with the necessary technological characteristics, such as for example some techno-polymers.
- the impeller according to the present invention therefore allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
- the materials used may be any according to the requirements of the state of the art.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Description
- The present invention relates to an impeller for centrifugal pumps, particularly of the type with one or more stages.
- As is known, a centrifugal pumps has an impeller conventionally made of a pair of shaped disk bodies facing each other so as to form a gap within which a series of vanes that connect the two disks are arranged.
- Centrally to each impeller there is a hub, or an equivalent coupling device, that allows to fasten the impeller to a transmission shaft that is turned by a motor means.
- Although impellers of the known type are widely used, they have drawbacks; among these, perhaps the most important is linked to the generation of axial thrusts.
- The impeller of a centrifugal pump is in fact subjected to different pressures that act on the two faces: a pressure lower than the atmospheric pressure generally acts on the inlet side, while a pressure substantially equal to the delivery pressure acts on the opposite face. This produces an axial thrust which can even be considerable, such as to create great losses in terms of efficiency and overloads that damage the bearings of the motor.
- Those problems are emphasized in the case of multistage pumps.
- In an attempt to solve the problems linked to the generation of axial thrusts, some manufacturers of multistage pumps key half of the impellers in the opposite direction with respect to the remaining ones.
- However, such solution creates significant difficulties in making the internal passage channels.
- The prior art also includes an impeller for centrifugal pumps disclosed in the Italian patent application no.
ITVI2014A000271 - Furthermore, reference is made to
JP S54 072 501 A US3944406 A ,US3541607 A ,FR526862 WO2010/110937 . - The aim of the invention is to solve the problems described above, providing a impeller for centrifugal pumps that allows to reduce axial thrusts, at the same time ensuring maximum efficiency, and provides for the use of disk elements with the same diameter.
- Within the scope of this aim, a particular object of the invention is to provide an impeller that allows to solve the problems linked to the traction that is usually generated on the transmission shaft.
- Another object of the invention is to provide an impeller that allows to preserve the bearings of the motor.
- Another object of the invention is to provide an impeller that can be manufactured with a small number of components and is therefore advantageous also from a purely economic standpoint.
- This aim, these objects and others that will become better apparent hereinafter are achieved by an impeller for centrifugal pumps as set forth in
claim 1 and a centrifugal pump comprising such an impeller, as set forth inclaim 5. - Further embodiments are inter alia disclosed in the dependent claims. The impeller inter alia comprises a first disk element, functionally arranged toward the inlet, which is coaxial to and faces a second disk element, which is functionally arranged toward the delivery; said second disk element being connected rigidly to said first disk element by angularly spaced vanes and being centrally provided with a fastening means for fastening to a transmission shaft; said impeller comprising specifically shaped and/or arranged openings formed iri the substantially peripheral region of said second disk element, between pairs of adjacent vanes, substantially at the areas subjected to the greatest axial thrust.
- The centrifugal pump comprises a substantially hollow body that accommodates at least one impeller according to
claim 1 that is fastened to a transmission shaft which can be rotated about a rotation axis by a motor means. - The impeller according to the invention allows to considerably reduce the axial thrusts but at the same time ensure maximum efficiency and head.
- In fact, by emptying the areas that are subjected to the highest pressure in the second disk element, i.e. by forming the openings, it is possible to reduce the forces that generate the axial thrust.
- Also, head and efficiency are not reduced because the profile of these openings is fully included within the second disk element.
- The impeller according to the present invention allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
- Further characteristics and advantages will become better apparent from the description of preferred but not exclusive embodiments of a impeller according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
-
Figure 1 is a front view of an impeller not belonging to the invention; -
Figure 2 is a rear view of the impeller ofFigure 1 ; -
Figure 3 is a sectional side view of the impeller ofFigure 1 ; -
Figure 4 is a front view of an alternative impeller, which does not belong to the invention; -
Figure 5 is a rear view of the impeller ofFigure 4 ; -
Figure 6 is a sectional side view of the impeller ofFigures 4 and5 ; -
Figure 7 is a front view of an impeller according to an embodiment of the invention; -
Figure 8 is a rear view of the impeller ofFigure 7 ; -
Figure 9 is a sectional side view of the impeller ofFigures 7 and 8 ; -
Figure 10 is a front view of an impeller according to an unclaimed example useful for understanding the invention; -
Figure 11 is a rear view of the impeller ofFigure 10 ; -
Figure 12 is a sectional side view of the impeller ofFigures 10 and11 ; -
Figure 13 is a front view of an impeller according to another unclaimed example useful for understanding the invention; -
Figure 14 is a rear view of the impeller ofFigure 13 ; -
Figure 15 is a sectional side view of the impeller ofFigures 13 and 14 ; -
Figure 16 is a front view of an alternative impeller, which does not belong to the invention; -
Figure 17 is a rear view of the impeller ofFigure 16 ; -
Figure 18 is a sectional side view of the impeller ofFigures 16 and17 . -
Figures 1 to 3 illustrate an impeller for a centrifugal pumps, globally designated by thereference numeral 1. - The example illustrated herein relates to the case in which the
impeller 1 is used in a multistage centrifugal pump; however, it is evident to the person skilled in the art that the impeller according to the present invention can also be fitted on pumps of another type, like single stage centrifugal pump. - The multistage centrifugal pump, which is per se known and is not shown in the figures, is constituted by a substantially hollow body that accommodates a set of impellers provided according to the present invention, which are coaxially fastened to a transmission shaft that is turned by a motor means.
- The
impeller 1 includes afirst disk element 2, which is functionally arranged towards the inlet, and asecond disk element 3, which is functionally arranged towards the delivery. - The diameter of the
second disk element 3 is substantially equal to, or slightly smaller than, the diameter of thefirst disk element 2. - The two
disk elements rotation axis 1000 and face each other so as to form a substantially cylindrical interspace. -
Vanes 4 are arranged within the interspace and rigidly connect thefirst disk element 2 to thesecond disk element 3. - The
vanes 4, which are angularly distributed around therotation axis 1000, extend from the center toward the peripheral region of the twodisk elements - In the illustrated solution, for example, the
vanes 4 are curved so as to form ducts that diverge and are arranged radially. - Advantageously, the
second disk element 3 is fastened to a transmission shaft by means of a fastening means. The transmission shaft, which is not shown in the figures, rotates about therotation axis 1000. - The fastening means comprises a
hub 5, which can be associated mechanically with the transmission shaft, provided at the center of thesecond disk element 3. - A through
hole 6 is centrally provided on thefirst disk element 2, opposite to thehub 5; the throughhole 6 has a diameter that is larger than that of the transmission shaft. - The through
hole 6 is connected to acollar 7 that protrudes from thefirst disk element 2. - In practice, when the
impeller 1 is mounted on the transmission shaft, thecollar 7 surrounds the shaft, forming an annular opening that constitutes the intake of the impeller. - The
impeller 1 includes a series of openings formed in the substantially peripheral region of thesecond disk element 3, between pairs ofadjacent vanes 4, in which it is possible to identify the areas of the disk that are subject to the greatest axial thrust. - The radially peripheral side of each opening extends for a distance that is shorter than that of the peripheral edge of the
second disk element 3, with respect to therotation axis 1000. - In other words, the openings are completely included within the profile of the
second disk element 3. - In the embodiment shown in
Figures 1 to 3 , the openings are constituted by shapedslots 8 provided in the peripheral region of thesecond disk element 3, between pairs ofadjacent vanes 4. - Each contoured
slot 8 has an arc-like profile 9, at the radially peripheral side; the arc-like profile 9 has a convexity facing therotation axis 1000. - The arc-
like profile 9 is connected with an oppositecontoured profile 10, which, in the example shown inFigures 1 to 3 , has a curved portion, with the convexity facing therotation axis 1000. -
Figures 4 to 6 show an impeller, generally designated by thereference numeral 101, which is similar to theimpeller 1 but is provided with contouredprofiles 110 with the convexity facing the outside of thesecond disk element 3. - According to the embodiment of the invention shown in
Figures 7 to 9 , in which the impeller according to the invention is generally designated by thereference numeral 201, the arc-like profiles 9 and the contouredprofiles 10, of thecontoured slots 8 are joined by one or more radiallyextended tabs 211 that have the function of stiffening the structure. - According to the unclaimed example illustrated in
Figures 10 to 12 , in which the impeller is designated by thereference numeral 301, the openings are constituted by throughholes 308 provided in the substantially peripheral region of thesecond disk element 3, between pairs ofadjacent vanes 4. - In the example shown in
Figures 10 to 12 , the centers of the throughholes 308 are arranged substantially along an arc of a circumference that is centered on therotation axis 1000; however, it is evident to the person skilled in the art that the through holes might be arranged in other equivalent manners. - For example,
figures 13 to 15 show an impeller, designated by thereference numeral 401, which is similar to theimpeller 301 but has throughholes 408 that are formed substantially along multiple arcs which are concentric and centered with respect to therotation axis 1000. -
Figures 16 to 18 show an impeller, generally designated by thereference numeral 501, which includes throughholes 508 provided in thesecond disk element 3, between pairs ofadjacent vanes 4, and arranged substantially along arcs of a circumference the center of which is arranged outside the disk. - In
Figures 4 to 18 , the elements that correspond to the elements that have already been described with reference to the embodiment shown inFigures 1 to 3 have been designated by the same reference numerals. - The impeller according to the invention may be manufactured by means of various techniques, by using metallic materials such as, for example, steel, stainless steel, die-cast steel, cast iron, brass, and the like, or other materials provided with the necessary technological characteristics, such as for example some techno-polymers.
- As regards the operation of the impeller according to the invention, experimental tests and careful analysis of the results have allowed to observe that the openings provided in the
second disk element 3 entail a higher fluid-dynamics efficiency and a good head for an equal reduction of axial thrusts. - In practice it has been found that the impeller for centrifugal pumps, according to the invention, fully achieves the intended aim, since it allows to reduce considerably the axial thrusts but at the same time ensure maximum efficiency and head.
- In fact, by emptying the areas that are subjected to the highest pressure in the second disk element, i.e., by forming the openings, it is possible to reduce the forces that generate the axial thrust.
- Also, head and efficiency are not reduced because the profile of these openings is fully included within the second disk element.
- The impeller according to the present invention therefore allows to solve the problems linked to the traction that is usually generated on the transmission shaft of centrifugal pumps with one or more stages. This allows, for example, to avoid damage to the bearings of the motor.
- The impeller for centrifugal pumps, and the centrifugal pump thus conceived are susceptible of numerous modifications and variations within the scope of the invention as defined by the claims.
- In practice, the materials used, so long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to the requirements of the state of the art.
Claims (6)
- An impeller (1; 201) for centrifugal pumps comprising:a first disk element (2); anda second disk element (3);wherein the first disk element (2) is functionally arranged toward the inlet, and is coaxial to and faces the second disk element, which is functionally arranged toward the delivery;wherein said second disk element (3) is connected rigidly to said first disk element (2) by angularly spaced vanes (4) and is centrally provided with a fastening means (5) for fastening to a transmission shaft;said impeller (1; 201) further comprising openings formed in the substantially peripheral region of said second disk element (3), between pairs of adjacent vanes (4), substantially at the areas subjected to the greatest axial thrust,said openings are constituted by contoured slots (8), the radially peripheral side of each of said contoured slots (8) having an arc-like profile (9), wherein said arc-like profile (9) has a convexity facing said rotation axis (1000);wherein each of said contoured slots (8) has a contoured profile (10) opposite the arc-like profile (9),characterized in thatthe arched profile (9) and the contoured profile (10) of the contoured slots (8) are joined by at least one tab (211) with radial development.
- The impeller (201) according to claim 1, wherein said contoured profile (10) has a curved portion with a convexity facing said rotation axis (1000).
- The impeller (1; 201) according to any one of the preceding claims, wherein said fastening means (5) comprises a hub mechanically associated with said transmission shaft; said hub being opposite to a collar (7) having a larger diameter than the diameter of said rotation axis (1000); said collar (7) being provided on said first disk element (2).
- The impeller (1; 201) according to any one of the preceding claims, characterized in that said second disk element (3) has a diameter that is substantially equal to, or smaller than, the diameter of said first disk element (2).
- A centrifugal pump comprising:
a substantially hollow body that accommodates at least one impeller (1; 201) according to any one of the preceding claims that is fastened to a transmission shaft and configured to rotate about the rotation axis (1000) when rotated by motor means. - The centrifugal pump according to claim 5, wherein the centrifugal pump is a multistage pump and the substantially hollow body accommodates a set of said impellers (1; 201).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVI20150081 | 2015-03-20 | ||
PCT/JP2016/059789 WO2016153068A1 (en) | 2015-03-20 | 2016-03-18 | Impeller for centrifugal pumps |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3271587A1 EP3271587A1 (en) | 2018-01-24 |
EP3271587A4 EP3271587A4 (en) | 2018-10-17 |
EP3271587B1 true EP3271587B1 (en) | 2023-07-12 |
Family
ID=53177841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16768970.2A Active EP3271587B1 (en) | 2015-03-20 | 2016-03-18 | Impeller for centrifugal pumps |
Country Status (12)
Country | Link |
---|---|
US (1) | US20180045213A1 (en) |
EP (1) | EP3271587B1 (en) |
JP (1) | JP6676651B2 (en) |
KR (1) | KR102491363B1 (en) |
CN (1) | CN107429706A (en) |
BR (1) | BR112017020084B1 (en) |
DK (1) | DK3271587T3 (en) |
ES (1) | ES2954939T3 (en) |
MY (1) | MY193271A (en) |
RU (1) | RU2709404C2 (en) |
TW (1) | TWI725016B (en) |
WO (1) | WO2016153068A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITUB20150308A1 (en) | 2015-05-04 | 2016-11-04 | Ebara Corp | IMPELLER STRUCTURE, ESPECIALLY FOR CENTRIFUGAL PUMPS |
CN106907348B (en) * | 2015-12-23 | 2021-04-09 | 德昌电机(深圳)有限公司 | Impeller and pump using same |
EP3324052A1 (en) * | 2016-11-18 | 2018-05-23 | Sogefi Air & Cooling (SAS) | Impeller for a fluid pump |
WO2023274991A1 (en) | 2021-07-02 | 2023-01-05 | Koninklijke Philips N.V. | Impeller for used in a fan and a fan |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR526862A (en) * | 1919-11-11 | 1921-10-15 | Walter Hayhurst | Improvements to centrifugal pumps |
WO2010110937A1 (en) * | 2009-03-25 | 2010-09-30 | Woodward Governor Company | Centrifugal impeller with controlled force balance |
Family Cites Families (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733361A (en) * | 1956-01-31 | bessiere | ||
US958612A (en) * | 1907-08-12 | 1910-05-17 | Wilhelm Heinrich Eyermann | Means for balancing turbines and pumps. |
US1473802A (en) * | 1921-10-26 | 1923-11-13 | Superior Mfg Company | Centrifugal pump with self-centering runner |
US1634317A (en) * | 1925-07-22 | 1927-07-05 | Worthington Pump & Mach Corp | Impeller balancing and sealing device |
US1871747A (en) * | 1929-07-05 | 1932-08-16 | Dempster Mill Mfg Company | Impeller for centrifugal pumps |
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2016
- 2016-03-16 TW TW105108055A patent/TWI725016B/en active
- 2016-03-18 WO PCT/JP2016/059789 patent/WO2016153068A1/en active Application Filing
- 2016-03-18 CN CN201680016266.2A patent/CN107429706A/en active Pending
- 2016-03-18 RU RU2017135417A patent/RU2709404C2/en active
- 2016-03-18 MY MYPI2017703305A patent/MY193271A/en unknown
- 2016-03-18 KR KR1020177029673A patent/KR102491363B1/en active IP Right Grant
- 2016-03-18 US US15/556,179 patent/US20180045213A1/en not_active Abandoned
- 2016-03-18 JP JP2017548477A patent/JP6676651B2/en active Active
- 2016-03-18 ES ES16768970T patent/ES2954939T3/en active Active
- 2016-03-18 DK DK16768970.2T patent/DK3271587T3/en active
- 2016-03-18 EP EP16768970.2A patent/EP3271587B1/en active Active
- 2016-03-18 BR BR112017020084-8A patent/BR112017020084B1/en active IP Right Grant
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WO2010110937A1 (en) * | 2009-03-25 | 2010-09-30 | Woodward Governor Company | Centrifugal impeller with controlled force balance |
Also Published As
Publication number | Publication date |
---|---|
RU2017135417A (en) | 2019-04-09 |
JP6676651B2 (en) | 2020-04-08 |
DK3271587T3 (en) | 2023-09-11 |
BR112017020084A2 (en) | 2019-05-14 |
EP3271587A4 (en) | 2018-10-17 |
EP3271587A1 (en) | 2018-01-24 |
JP2018508701A (en) | 2018-03-29 |
US20180045213A1 (en) | 2018-02-15 |
KR102491363B1 (en) | 2023-01-26 |
KR20170129822A (en) | 2017-11-27 |
ES2954939T3 (en) | 2023-11-27 |
WO2016153068A1 (en) | 2016-09-29 |
RU2017135417A3 (en) | 2019-07-17 |
MY193271A (en) | 2022-09-29 |
CN107429706A (en) | 2017-12-01 |
TWI725016B (en) | 2021-04-21 |
RU2709404C2 (en) | 2019-12-17 |
TW201638475A (en) | 2016-11-01 |
BR112017020084B1 (en) | 2023-03-14 |
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