EP1406017A1 - Centrifugal pump - Google Patents
Centrifugal pump Download PDFInfo
- Publication number
- EP1406017A1 EP1406017A1 EP20020425649 EP02425649A EP1406017A1 EP 1406017 A1 EP1406017 A1 EP 1406017A1 EP 20020425649 EP20020425649 EP 20020425649 EP 02425649 A EP02425649 A EP 02425649A EP 1406017 A1 EP1406017 A1 EP 1406017A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- blading
- shaft
- pump according
- previous
- 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- Withdrawn
Links
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005406 washing Methods 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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0027—Varying behaviour or the very pump
-
- 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
- F04D29/042—Axially shiftable 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
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2283—Rotors specially for centrifugal pumps with special measures for reverse pumping action
-
- 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
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/50—Fluid-guiding means, e.g. diffusers adjustable for reversing fluid flow
- F04D29/506—Fluid-guiding means, e.g. diffusers adjustable for reversing fluid flow especially adapted for liquid pumps
Definitions
- the present invention relates to a centrifugal pump, and in particular to a pump which can pump liquids in two different delivery conduits according to the rotation direction of the impeller.
- centrifugal pumps in particular those for electric household appliances, can be driven by electric motors to pump water in a delivery conduit linked to the washing circuit.
- Some dishwashers have two separate circuits for upper and lower sprayers, so they require a valve arranged downstream the centrifugal pump to alternately deviate the water flow coming from the delivery conduit to these sprayers, with consequent increase of the complexity and of the costs of the dishwasher.
- the object of the present invention is therefore to provide means for avoiding the above-mentioned drawback, that is means which allow to eliminate the valve for deviating the water flow to two separate circuits. Said object is achieved with a pump whose main features are specified in the first claim and other features are specified in the following claims.
- the pump according to the present invention automatically selects the blading suitable for the liquid pumping and arranges it close to one of the two openings obtained in the impeller. Since both these openings are connected to a delivery conduit, it is possible to select the circuit in which water is pumped simply by controlling the rotation direction of the impeller, that is of the motor which drives the pump.
- the centrifugal pump comprises in a known way an impeller 1 provided with a first blading 2 suitable for pumping liquids from an axial direction to a radial direction, as indicated by arrows 3. These liquids are sucked in by at least one inlet conduit 4 and pumped towards a manifold 5, generally having a substantially cylindrical shape, which is arranged around impeller 1 and is provided with one or more delivery conduits 6 for the liquids pumped by impeller 1.
- Figure 2 shows the blades of blading 2 (drawn with partially broken lines) which are suitably oriented to pump liquids towards manifold 5 in the direction of arrows 3 according to the rotation direction (clockwise in the figure) of impeller 1.
- impeller 1 is mechanically linked to a shaft 7 which can be driven by a motor 8 through a mechanism comprising a screw 9 which is fixed to shaft 7 and is rotatably arranged inside a cylindrical hub 10 joined to impeller 1, in particular integral thereto.
- Motor 8 is provided with control means, for example of the electronic kind, suitable for controlling the rotation direction of shaft 7.
- the cylindrical hub 10 is suitably provided with an inner protrusion 11 suitable for sliding along the helicoidal canal 12 of screw 9, so that the rotation of shaft 7 in one direction or in the other causes the advancing or the moving back, respectively, of impeller 1 in a housing 13 having a substantially cylindrical shape obtained in the body of the pump.
- the axial movement of impeller 1 with respect to shaft 7 is limited by a pair of cylindrical shoulders 14 which are arranged at the two ends of screw 9 and stop the sliding of the internal protrusion 11 along the helicoidal canal 12.
- impeller 1 is provided with a second blading 15 which is oriented in the opposite direction with respect to the direction of the first blading 2, is arranged in a substantially coaxial way with the latter and is divided therefrom by a cover disk 16.
- the selection of blading 2 or 15 with the orientation suitable for pumping the liquids coming from the inlet conduit 4 toward manifold 5 is automatically accomplished by the pump according to the rotation direction of shaft 7, since the rotation thereof in one direction or in another one causes the axial moving of impeller 1 in housing 13 and the consequent arrangement of blading 2 or 15 suitable for pumping according to the rotation direction of shaft 7 close to a first cylindrical opening 17 or a second cylindrical opening 18, respectively, which connect housing 13 of impeller 1 with manifold 5.
- Manifold 5 is suitably provided with a dividing wall 19 arranged between the cylindrical openings 17, 18 to divide manifold 5 into two separate chambers, the first chamber being connected to the first delivery conduit 6 and the second chamber being connected to a second delivery conduit 20.
- the height of openings 17, 18 which link the housing 13 of impeller 1 to manifold 5 is substantially equal to the height of the first blading 2 and/or the second blading 15.
- the screw mechanism which connects the shaft to the impeller may be modified.
- shoulders 14 may limit the sliding of hub 10 and not of protrusion 11 into the helicoidal canal 12 or the latter may be obtained in the inner wall of hub 10, so as to be a female screw 9 integral therewith, while protrusion 11 is rigidly connected to shaft 7.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A centrifugal pump comprising an impeller (1) provided with a first blading
(2) suitable for sucking liquids from at least one inlet conduit (4) and pumping
them towards a manifold (5) arranged around the impeller (1), the blades of this
first blading (2) being oriented for pumping according to a rotation direction (3) of
the impeller (1), which is mechanically linked to a shaft (7) which can be driven
by a motor (8) and is provided with a second blading (15) oriented in the direction
opposite to the direction of the first blading (2) and is linked to the shaft (7) by
means of a screw mechanism (9, 11, 12) so that the rotation of shaft (7) in one
direction (3) or in the other one (21) causes the axial advancing or moving back,
respectively, of the impeller (1) in a housing (13) obtained in the body of the
pump and the consequent arrangement of the blading (2, 15) suitable for pumping
according to the rotation direction (3, 21) of the shaft (7) close to at least one first
opening (17) or at least one second opening (18) which connect the housing (13)
of the impeller (1) to the manifold (5).
Description
- The present invention relates to a centrifugal pump, and in particular to a pump which can pump liquids in two different delivery conduits according to the rotation direction of the impeller.
- The known centrifugal pumps, in particular those for electric household appliances, can be driven by electric motors to pump water in a delivery conduit linked to the washing circuit. Some dishwashers have two separate circuits for upper and lower sprayers, so they require a valve arranged downstream the centrifugal pump to alternately deviate the water flow coming from the delivery conduit to these sprayers, with consequent increase of the complexity and of the costs of the dishwasher.
- The object of the present invention is therefore to provide means for avoiding the above-mentioned drawback, that is means which allow to eliminate the valve for deviating the water flow to two separate circuits. Said object is achieved with a pump whose main features are specified in the first claim and other features are specified in the following claims.
- By virtue of the double blading of the impeller and of the screw mechanism which moves the impeller according to the rotation direction thereof, the pump according to the present invention automatically selects the blading suitable for the liquid pumping and arranges it close to one of the two openings obtained in the impeller. Since both these openings are connected to a delivery conduit, it is possible to select the circuit in which water is pumped simply by controlling the rotation direction of the impeller, that is of the motor which drives the pump.
- Further advantages and features of the pump according to the present invention will be clear to those skilled in the art from the following detailed and non-limiting description of one embodiment thereof with reference to the attached drawings wherein:
- figure 1 shows a longitudinal sectional view of the pump according to this embodiment of the invention in a rotation direction;
- figure 2 shows a front view of the pump of figure 1;
- figure 3 shows an enlargement of the pump of figure 1;
- figure 4 shows a longitudinal sectional view of the pump of figure 1 in the opposite rotation direction; and
- figure 5 shows a front view of the pump of figure 1 in the opposite rotation direction.
- Referring to figure 1, it is visible that the centrifugal pump according to the present invention comprises in a known way an
impeller 1 provided with afirst blading 2 suitable for pumping liquids from an axial direction to a radial direction, as indicated byarrows 3. These liquids are sucked in by at least oneinlet conduit 4 and pumped towards amanifold 5, generally having a substantially cylindrical shape, which is arranged aroundimpeller 1 and is provided with one ormore delivery conduits 6 for the liquids pumped byimpeller 1. - Figure 2 shows the blades of blading 2 (drawn with partially broken lines) which are suitably oriented to pump liquids towards
manifold 5 in the direction ofarrows 3 according to the rotation direction (clockwise in the figure) ofimpeller 1. - Referring also to figure 3, it is visible that
impeller 1 is mechanically linked to ashaft 7 which can be driven by amotor 8 through a mechanism comprising ascrew 9 which is fixed toshaft 7 and is rotatably arranged inside acylindrical hub 10 joined toimpeller 1, in particular integral thereto.Motor 8 is provided with control means, for example of the electronic kind, suitable for controlling the rotation direction ofshaft 7. Thecylindrical hub 10 is suitably provided with aninner protrusion 11 suitable for sliding along thehelicoidal canal 12 ofscrew 9, so that the rotation ofshaft 7 in one direction or in the other causes the advancing or the moving back, respectively, ofimpeller 1 in ahousing 13 having a substantially cylindrical shape obtained in the body of the pump. The axial movement ofimpeller 1 with respect toshaft 7 is limited by a pair ofcylindrical shoulders 14 which are arranged at the two ends ofscrew 9 and stop the sliding of theinternal protrusion 11 along thehelicoidal canal 12. - According to the invention,
impeller 1 is provided with asecond blading 15 which is oriented in the opposite direction with respect to the direction of thefirst blading 2, is arranged in a substantially coaxial way with the latter and is divided therefrom by acover disk 16. The selection ofblading inlet conduit 4 towardmanifold 5 is automatically accomplished by the pump according to the rotation direction ofshaft 7, since the rotation thereof in one direction or in another one causes the axial moving ofimpeller 1 inhousing 13 and the consequent arrangement ofblading shaft 7 close to a firstcylindrical opening 17 or a secondcylindrical opening 18, respectively, which connecthousing 13 ofimpeller 1 withmanifold 5. Manifold 5 is suitably provided with a dividingwall 19 arranged between thecylindrical openings manifold 5 into two separate chambers, the first chamber being connected to thefirst delivery conduit 6 and the second chamber being connected to asecond delivery conduit 20. The height ofopenings housing 13 ofimpeller 1 tomanifold 5 is substantially equal to the height of thefirst blading 2 and/or thesecond blading 15. - Referring now to figures 4 and 5, it is visible that the inversion of the rotation direction of
shaft 7 causes the sliding of theinternal protrusion 11 ofhub 10 alongscrew 9 and thus the axial moving ofimpeller 1 towardmotor 8. This causes the arrangement of the second blading 15 (drawn with broken lines in figure 5) close to the second opening 18 and the simultaneous arrangement of thefirst blading 2 close to the inner wall ofhousing 13 comprised betweenopenings inlet conduit 4 and pumped by thesecond blading 15 towardsmanifold 5 follows the direction (counterclockwise in figure 5) indicated byarrows 21 and induced by this blading, so as to pump liquids toward thedelivery conduit 20 and not toward thedelivery conduit 6. A further inversion of the rotation direction ofshaft 7 would cause another axial moving ofimpeller 1, which would be arranged again as in figures 1 to 3. - In other embodiments of the present invention the screw mechanism which connects the shaft to the impeller may be modified. For example,
shoulders 14 may limit the sliding ofhub 10 and not ofprotrusion 11 into thehelicoidal canal 12 or the latter may be obtained in the inner wall ofhub 10, so as to be afemale screw 9 integral therewith, whileprotrusion 11 is rigidly connected toshaft 7.
Claims (11)
- A centrifugal pump comprising an impeller (1) provided with a first blading (2) suitable for sucking liquids from at least one inlet conduit (4) and pumping them towards a manifold (5) arranged around the impeller (1), the blades of this first blading (2) being oriented for pumping according to a rotation direction (3) of the impeller (1), which is mechanically linked to a shaft (7) which can be driven by a motor (8), characterized in that the impeller (1) is provided with a second blading (15) oriented in the direction opposite to the direction of the first blading (2) and is linked to the shaft (7) by means of a screw mechanism (9, 11, 12) so that the rotation of the shaft (7) in one direction (3) or in the other one (21) causes the axial advancing or moving back, respectively, of the impeller (1) in a housing (13) obtained in the body of the pump and the consequent arrangement of the blading (2, 15) suitable for pumping according to the rotation direction (3, 21) of the shaft (7) close to at least one first (17) or at least one second (18) opening which connect the housing (13) of the impeller (1) to the manifold (5).
- A pump according to the previous claim, characterized in that said screw mechanism (9, 11, 12) comprises a screw (9) which is fixed to the shaft (7) and is rotatably arranged inside a hub (10) which is joined to the impeller (1) and is provided with a protrusion (11) suitable for sliding along the helicoidal canal (12) of the screw (9).
- A pump according to claim 1, characterized in that said screw mechanism (9, 11, 12) comprises a protrusion (11), which is rigidly linked to the shaft (7) and is suitable for sliding along a helicoidal canal (12) obtained in the internal wall of a hub (10) joined to the impeller (1), so as to form a female screw (9) integral with this hub (10).
- A pump according to one of the previous claims, characterized in that the axial moving of the impeller (1) with respect to the shaft (7) is limited by a pair of shoulders (14) which are arranged at the two ends of the screw mechanism (9, 11, 12).
- A pump according to claim 4, characterized in that said shoulders (14) stop the sliding of the protrusion (11) along the helicoidal canal (12).
- A pump according to claim 4, characterized in that said shoulders (14) stop the axial sliding of the hub (10) of the impeller (1).
- A pump according to one of the previous claims, characterized in that the second blading (15) is arranged substantially coaxial to the first blading (2).
- A pump according to one of the previous claims characterized in that the first (2) and the second blading (15) are divided by a cover disk (16).
- A pump according to one of the previous claims, characterized in that the height of the openings (17, 18) which link the housing (13) of the impeller (1) to the manifold (5) is substantially equal to the height of the first (2) and/or of the second (15) blading.
- A pump according to one of the previous claims, characterized in that a dividing wall (19) arranged between the openings (17, 18) of manifold (5) divides the latter into two separate chambers, the first chamber being connected to a first delivery conduit (6) and the second chamber being connected to a second delivery conduit (20).
- A pump according to one of the previous claims, characterized in that when the first (2) or the second (15) blading are arranged close to the first (17) or at the second (18) opening, the second (15) or the first (2) blading are respectively arranged close to the internal wall of the housing (13) comprised between the two openings (17, 18).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20020425649 EP1406017A1 (en) | 2002-10-03 | 2002-10-28 | Centrifugal pump |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02425599 | 2002-10-03 | ||
EP02425599A EP1387086A1 (en) | 2002-10-03 | 2002-10-03 | Centrifugal pump |
EP20020425649 EP1406017A1 (en) | 2002-10-03 | 2002-10-28 | Centrifugal pump |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1406017A1 true EP1406017A1 (en) | 2004-04-07 |
Family
ID=31995550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020425649 Withdrawn EP1406017A1 (en) | 2002-10-03 | 2002-10-28 | Centrifugal pump |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1406017A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2955384A1 (en) * | 2014-06-09 | 2015-12-16 | Magna Powertrain Inc. | Sensorless low flow electric water pump and method of regulating flow therewith |
RU2581307C2 (en) * | 2014-03-06 | 2016-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Воронежский государственный технический университет" | Centrifugal pump |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2916997A (en) * | 1956-04-09 | 1959-12-15 | Sarl Johannes Freres | Double-outlet centrifugal pump |
GB1398148A (en) * | 1971-10-12 | 1975-06-18 | Esswein Sa | Pumping devices for liquids and dishwashing machines equipped with such devices |
US4941801A (en) * | 1988-03-23 | 1990-07-17 | Aisin Seiki Kabushiki Kaisha | Double water pump device |
EP0465787A1 (en) * | 1990-07-12 | 1992-01-15 | Zanussi Elettrodomestici S.p.A. | Dishwashing machine with single-motor pump unit |
-
2002
- 2002-10-28 EP EP20020425649 patent/EP1406017A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2916997A (en) * | 1956-04-09 | 1959-12-15 | Sarl Johannes Freres | Double-outlet centrifugal pump |
GB1398148A (en) * | 1971-10-12 | 1975-06-18 | Esswein Sa | Pumping devices for liquids and dishwashing machines equipped with such devices |
US4941801A (en) * | 1988-03-23 | 1990-07-17 | Aisin Seiki Kabushiki Kaisha | Double water pump device |
EP0465787A1 (en) * | 1990-07-12 | 1992-01-15 | Zanussi Elettrodomestici S.p.A. | Dishwashing machine with single-motor pump unit |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2581307C2 (en) * | 2014-03-06 | 2016-04-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Воронежский государственный технический университет" | Centrifugal pump |
EP2955384A1 (en) * | 2014-06-09 | 2015-12-16 | Magna Powertrain Inc. | Sensorless low flow electric water pump and method of regulating flow therewith |
US10288072B2 (en) | 2014-06-09 | 2019-05-14 | Magna Powertrain Fpc Limited Partnership | Sensorless low flow electric water pump and method of regulating flow therewith |
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