EP3156663A1 - Centrifugal pump assembly - Google Patents
Centrifugal pump assembly Download PDFInfo
- Publication number
- EP3156663A1 EP3156663A1 EP15189912.7A EP15189912A EP3156663A1 EP 3156663 A1 EP3156663 A1 EP 3156663A1 EP 15189912 A EP15189912 A EP 15189912A EP 3156663 A1 EP3156663 A1 EP 3156663A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- centrifugal pump
- annular space
- surrounding
- centrifugal
- 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
- 239000000110 cooling liquid Substances 0.000 claims abstract description 8
- 239000012809 cooling fluid Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
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- 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
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- 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
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- 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
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- 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
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the invention relates to a centrifugal pump unit, in particular as part of a domestic waterworks, which has a single or multi-stage centrifugal pump, which is driven by an electric motor.
- centrifugal pump units In order to dissipate the heat generated by the drive motor, it is in prior art centrifugal pump units to guide the flow of the pump along the motor so that it is not overheated. Such arrangements are known in particular for centrifugal pump units for cold water production.
- centrifugal pumps in domestic water systems or pressure booster systems
- GRUNDFOS MQ multi-stage centrifugal pump lying, ie arranged with a horizontal axis, which is multi-level and has a channel guide within the domestic waterworks, in which the pumped by the pump water from the last Pump stage promotes an annular space surrounding the electric motor, which in turn connects to a channel that leads to the output or pressure connection of the domestic waterworks.
- the constructive measures taken there for cooling the engine have proven to be ideal, since the main flow of flow flows along the outside of the electric motor and thus always ensures adequate cooling.
- the invention has the object, a centrifugal pump unit, in particular as part of a domestic waterworks to design so that the electric motor is sufficiently cooled without the main flow must be performed along the electric motor.
- the object of the invention is achieved by a centrifugal pump unit having the features specified in claim 1, and as far as the home water plant-side application, by a domestic waterworks with the features specified in claim 12. Waterworks within the meaning of the present invention is also a pressure booster.
- Advantageous embodiments of the invention are specified in the dependent claims of the following description and the drawings. In this case, the features specified in the dependent claims and the description in each case, but also in a suitable combination, the solution according to the invention according to claim 1 or according to claim 12 further develop.
- the centrifugal pump assembly according to the invention which in particular forms part of a domestic waterworks, has an electric motor and a driven one or more stages centrifugal pump with at least one impeller, which generates a main flow through an annular space surrounding the at least one pump stage and a cooling liquid flow through a space surrounding the engine ,
- the annulus is divided by at least two vanes in partial annulus, the different in operation Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these Opera Have pressure level and each of these
- the basic idea of the solution according to the invention is, first of all, to use only a partial flow of the liquid conveyed by the centrifugal pump for cooling the motor, in order to be freer in design and design in this way in the ducting.
- a main flow is generated by a surrounding the at least one pump stage annulus, d. H. the main flow is led at the end of the pump through this annulus towards the suction side of the pump, so that the main duct is substantially in the area of the pump and not on the motor side.
- a cooling liquid flow is diverted from the main flow and passed through a space surrounding the engine.
- a difference in the pressure level is generated in the annular space surrounding the at least one pump stage, in which at least two guide vanes are arranged, which subdivide at least parts of this annular space into two partial annular spaces which have different pressure levels during operation.
- these partial annular spaces are each line-connected to the space surrounding the motor.
- this constructive measure ensures reliable cooling of the electric motor, but on the other hand makes it possible to configure the ducting so that the pump inlet and pump outlet are on the same side that at least the main flow through a the at least one pump stage surrounding annular space is returned to the pump inlet.
- a very compact construction is possible, especially when the centrifugal pump unit according to the invention forms part of a domestic waterworks.
- the effect of the different pressure levels in the two subspaces is formed in particular when the centrifugal pump assembly is lying, ie operated with a horizontal axis of the pump and motor.
- the vanes part of the last pump stage or this downstream. They are preferably arranged diametrically in the annular space, preferably in such a way that they form an imaginary dividing plane, which at least partially divides the annular space of the pump preferably substantially horizontally.
- the annular space surrounding the at least one pump stage at least partially limited by the pump housing.
- the construction according to the invention can then take place largely by utilizing already existing components.
- the last pump stage is formed by the impeller with the surrounding normal and the annular space dividing vanes in the pump housing and the first and optionally further pump stages are arranged therebetween within a cylinder jacket, which limits the annular space of the pump inwardly and which is divided at least in sections by the guide vanes in the axial direction.
- the dividing plane formed by the vanes extends through or parallel to the pump axis and preferably horizontally.
- these vanes dividing the annulus are designed and arranged so that they extend in the direction of the axis of rotation of the impeller or in a direction parallel thereto and thus protrude into the annulus, ie at the same time part of the diffuser for the last pump stage and release means for generating the pressure difference form for the coolant flow.
- the line connections to the space surrounding the motor are preferably formed by recesses in this end wall of the pump housing.
- the guide vanes forming the partial annular spaces extend radially along the end wall of the pump housing facing the electric motor and axially along an outer wall defining the annular space, preferably the pump housing. They thus form, on the one hand, part of the diffuser of the last pump stage and, on the other hand, walls which delimit the partial annular spaces from each other.
- these vanes are integral with the pump housing formed, which has both the end wall to the electric motor and the surrounding outer wall.
- the pump in which the pumped liquid is conveyed from the suction port of the first pump stage to the stator of the last pump stage substantially in the axial direction of the pump and then through the annular channel in the opposite direction, it is advantageous to use the pump as radial or radial / Form axial centrifugal pump.
- the pump is advantageously intended and designed for operation with a horizontally arranged axis of rotation, wherein the guide vanes dividing the annulus of the pump essentially extend in a horizontal plane in which the axis of rotation lies or parallel and / or slightly oblique (up to a maximum of 30 °) to) runs.
- motor and pump have a common shaft and the annular space of the pump is arranged in alignment with the space surrounding the motor, which is preferably also designed as an annular space.
- the constructive embodiments described above are particularly advantageous when using the centrifugal pump assembly according to the invention in a domestic waterworks.
- the domestic waterworks can be made much cheaper by these structural features, both in terms of manufacturing and assembly and in terms of its handling.
- the domestic waterworks according to the invention such a centrifugal pump unit and has its suction port and its pressure port arranged on the same side, preferably one above the other at an end face of the surrounding housing. This arrangement is possible because the flow through the annular space of the pump is returned in the direction of the suction side, so that the pressure connection of the domestic waterworks can be without elaborate internal ducting on the same side as the suction connection.
- the domestic water plant on a surrounding housing, in the pump and motor below, a diaphragm pressure vessel and the engine electronics are arranged above and above.
- the engine electronics over the engine and the diaphragm pressure vessel is advantageously arranged above the pump.
- electrical and hydraulic assemblies are locally separated from each other within the housing of the domestic water plant, which is beneficial.
- the channel guide can be placed on the side of the pump housing to which the suction and pressure connection are located.
- the domestic waterworks 1 has a housing 2, in which all components of the domestic waterworks are incorporated and which has a foot 3, with which the domestic waterworks 1 stands on a floor surface, for example, and is optionally anchored in this, for example by screws.
- the house waterworks 1 has its in Fig. 1 left side of the housing a suction port 4 and at a distance above a pressure port 5. Below the suction connection 4, a closable discharge opening 6 is provided.
- the lower part of the housing 2 is filled by a multi-stage centrifugal pump 7 and a driving electric motor 8, which are arranged horizontally, that is a horizontal shaft 9 in operation, which on the one hand receives the rotor of the electric motor 8 and the other hand, centrifugal 10 of the centrifugal pump 7.
- the here four-stage centrifugal pump is designed to be closed in the first three stages, that is, the adjacent to the respective impeller diffuser is surrounded by a cylinder wall 11 which forms the inner wall of an annular space 12 whose outer wall is formed by the pump housing.
- the pump housing is essentially formed from two housing parts, namely a pot-shaped housing part 13 and a suction port of the pump forming housing part 14.
- the housing part 14 is formed as a plastic injection molding, forms the suction port 4 and the pressure port 5 comprehensive side of the domestic waterworks 1 and has a from the annular space 12 to the pressure port 5 leading channel 15, which is a check valve 16 receives and opens at its free end to the top of the housing 2, where it is closed by a sealing plug 17.
- the pressure port 5 connects to this channel 15 in the flow direction behind the check valve 16 transversely. Offset by 180 °, transversely, a connection 18 is provided, to which a membrane pressure vessel 19 connects, which forms the pressure accumulator of the domestic waterworks 1.
- the diaphragm pressure vessel 19 is arranged above the pump 7, on the rear side of this an electronics housing 30 connects, which is arranged above the electric motor 8 and the entire control and regulating electronics of the domestic waterworks 1 receives.
- the water passes through the suction port 4 in the housing part 14, ie to the suction port of the pump 7, from there through the individual pump stages to the last impeller, from where it via the still described below open diffuser in a main flow 29 by 180 ° is redirected to the annular space 12, to get from there via the vertical channel 15 through the check valve 16 to the pressure port 5, where it leaves the house waterworks 1.
- the last impeller 10 is surrounded by vanes 21 and 22.
- the vanes 21 are conventional vanes, which are arranged radially surrounding the impeller and correspond to the usual design and function vanes.
- the guide vanes 22, which are arranged offset by 180 ° (relative to the axis of rotation of the pump) are extended in the axial direction into the annulus 12, they divide the annulus 12 into two annulus parts, namely a lower part annulus 23 and an upper part annulus 24.
- This annular space 12 dividing vanes 22 extend axially from an end wall 25 of the cup-shaped housing part 13 on the outer wall along to near the end of the housing part 13, ie where it is flanged to the housing part 14.
- the guide vanes 22 extend up to the cylinder wall 11, so that at least in the region of the cylinder wall 11 of the annular space 12 is divided by the guide vanes 22 approximately horizontally.
- the vanes 22 are formed inwardly as the vanes 21.
- the cup-shaped housing part 13 has a central recess 26 for the implementation and storage of the shaft 9. Surrounding this recess 26, the end wall 25 extends to the substantially cylindrical outer side of the housing part 13. In this end wall 25 are in the region aligned with the annular space 12 in the lower part of the annulus 23 and in the upper part annulus 24 recesses 27, to an adjoining, the Stator of the electric motor 8 lead surrounding annular space 28.
- These recesses 27 serve to allow the cooling liquid flow 30, which is generated by the different pressure level in the partial annular spaces 23 and 24, to pass from the lower partial annular space 23 into the lower part of the annular space 28 surrounding the electric motor 8, from there upwards and through the let upper recesses 27 in the end wall 25 in the upper part of annulus 24 to flow and then to get from there into the main flow.
- This pressure difference between the lower and the upper partial annular space 23, 24 produced by the guide vanes 22 is sufficient, to generate a sufficient coolant flow 30 through the annulus 28 and thus sufficient cooling of the electric motor 8.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Das Hauwasserwerk (1) weist einen Elektromotor (8) und eine davon angetriebene Kreiselpumpe (7) mit mindestens einem Kreiselrad (10) auf, welche einen Hauptförderstrom (29) durch einen Ringraum (12) sowie einen Kühlflüssigkeitsstrom (30) durch einen den Motor (8) umgebenden Raum (28) erzeugt. Der Ringraum (12) wird durch zwei Leitschaufeln in Teilringräume (23, 24) unterteilt, die im Betrieb unterschiedliche Druckniveaus aufweisen. Jeder Teilringraum (23, 24) ist mit dem den Motor (8) umgebenden Raum (28) verbunden, durch den der Kühlflüssigkeitsstrom läuft. (Fig. 5)The Hauwasserwerk (1) has an electric motor (8) and a driven centrifugal pump (7) with at least one impeller (10) having a main flow (29) through an annular space (12) and a cooling liquid flow (30) through a motor (8) generates surrounding space (28). The annular space (12) is subdivided by two guide vanes into partial annular spaces (23, 24), which have different pressure levels during operation. Each partial annular space (23, 24) is connected to the space (28) surrounding the motor (8) through which the flow of cooling fluid passes. (Fig. 5)
Description
Die Erfindung betrifft ein Kreiselpumpenaggregat, insbesondere als Teil eines Hauswasserwerkes, welches eine ein- oder mehrstufige Kreiselpumpe aufweist, die von einem Elektromotor angetrieben wird.The invention relates to a centrifugal pump unit, in particular as part of a domestic waterworks, which has a single or multi-stage centrifugal pump, which is driven by an electric motor.
Um die vom Antriebsmotor erzeugte Wärme abzuführen, zählt es bei Kreiselpumpenaggregaten zum Stand der Technik, den Förderstrom der Pumpe entlang des Motors zu führen, damit dieser nicht überhitzt wird. Derartige Anordnungen sind insbesondere bei Kreiselpumpenaggregaten zur Kaltwasserförderung bekannt.In order to dissipate the heat generated by the drive motor, it is in prior art centrifugal pump units to guide the flow of the pump along the motor so that it is not overheated. Such arrangements are known in particular for centrifugal pump units for cold water production.
Der Einsatz solcher Kreiselpumpen in Hauswasserwerken oder Druckerhöhungsanlagen zählt zum Stand der Technik. Bei einem von der Anmelderin unter der Bezeichnung "GRUNDFOS MQ" vertriebenen Hauswasserwerk ist eine mehrstufige Kreiselpumpe liegend, d. h. mit horizontaler Achse angeordnet, die mehrstufig ausgebildet ist und die eine Kanalführung innerhalb des Hauswasserwerks aufweist, bei welcher das von der Pumpe geförderte Wasser aus der letzten Pumpenstufe in einen den Elektromotor umgebenden Ringraum fördert, an den wiederum ein Kanal anschließt, der zum Ausgangs- bzw. Druckanschluss des Hauswasserwerks führt. Die dort vorgenommenen konstruktiven Maßnahmen zur Kühlung des Motors haben sich bestens bewährt, da der Hauptförderstrom an der Außenseite des Elektromotors entlang strömt und damit stets für eine ausreichende Kühlung sorgt. Die Konstruktion dieses bekannten Hauswasserwerks ist vergleichsweise aufwändig, weshalb man bestrebt ist, diese zu vereinfachen, so dass das Hauswasserwerk kostengünstiger hergestellt werden kann und auch anwendungstechnisch vorteilhafter gestaltet werden kann. Will man jedoch von dem bekannten Konstruktionsprinzip grundlegend abweichen, so bedingt dies auch eine Änderung des Kühlkonzepts für den Elektromotor.The use of such centrifugal pumps in domestic water systems or pressure booster systems is state of the art. In a distributed by the applicant under the name "GRUNDFOS MQ" domestic water plant is a multi-stage centrifugal pump lying, ie arranged with a horizontal axis, which is multi-level and has a channel guide within the domestic waterworks, in which the pumped by the pump water from the last Pump stage promotes an annular space surrounding the electric motor, which in turn connects to a channel that leads to the output or pressure connection of the domestic waterworks. The constructive measures taken there for cooling the engine have proven to be ideal, since the main flow of flow flows along the outside of the electric motor and thus always ensures adequate cooling. The construction of this known domestic waterworks is relatively complex, which is why it seeks to simplify this, so that the domestic waterworks can be produced more cheaply and also application technology can be made more advantageous. However, if one fundamentally deviates from the known design principle, this also requires a change in the cooling concept for the electric motor.
Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, ein Kreiselpumpenaggregat, insbesondere als Teil eines Hauswasserwerks so auszugestalten, dass der Elektromotor ausreichend gekühlt wird, ohne dass der Hauptförderstrom längs des Elektromotors geführt werden muss.Against this background, the invention has the object, a centrifugal pump unit, in particular as part of a domestic waterworks to design so that the electric motor is sufficiently cooled without the main flow must be performed along the electric motor.
Die Aufgabe der Erfindung wird durch ein Kreiselpumpenaggregat mit den in Anspruch 1 angegebenen Merkmalen gelöst, und soweit es die hauswasserwerkseitige Anwendung angeht, durch ein Hauswasserwerk mit den in Anspruch 12 angegebenen Merkmalen. Hauwasserwerk im Sinne der vorliegenden Erfindung ist auch eine Druckerhöhungsanlage. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen der nachfolgenden Beschreibung sowie den Zeichnungen angegeben. Hierbei können die in den Unteransprüchen und der Beschreibung angegebenen Merkmale jeweils für sich, aber auch in geeigneter Kombination die erfindungsgemäße Lösung gemäß Anspruch 1 bzw. gemäß Anspruch 12 weiter ausgestalten.The object of the invention is achieved by a centrifugal pump unit having the features specified in claim 1, and as far as the home water plant-side application, by a domestic waterworks with the features specified in
Das erfindungsgemäße Kreiselpumpenaggregat, welches insbesondere Teil eines Hauswasserwerkes bildet, weist einen Elektromotor und eine davon angetriebene ein- oder mehrstufige Kreiselpumpe mit mindestens einem Kreiselrad auf, welches einen Hauptförderstrom durch einen die mindestens eine Pumpenstufe umgebenden Ringraum sowie einen Kühlflüssigkeitsförderstrom durch einen den Motor umgebenden Raum erzeugt. Dabei ist der Ringraum durch mindestens zwei Leitschaufeln in Teilringräume unterteilt, die in Betrieb unterschiedliches Druckniveau aufweisen und jeder dieser Teilringräume ist mit dem den Motor umgebenden Raum leitungsverbunden.The centrifugal pump assembly according to the invention, which in particular forms part of a domestic waterworks, has an electric motor and a driven one or more stages centrifugal pump with at least one impeller, which generates a main flow through an annular space surrounding the at least one pump stage and a cooling liquid flow through a space surrounding the engine , In this case, the annulus is divided by at least two vanes in partial annulus, the different in operation Have pressure level and each of these Teilringräume is conductively connected to the surrounding space surrounding the engine.
Grundgedanke der erfindungsgemäßen Lösung ist es, zunächst einmal nur noch einen Teilstrom der von der Kreiselpumpe geförderten Flüssigkeit zur Kühlung des Motors einzusetzen, um auf diese Weise bei der Kanalführung freier in Konstruktion und Gestaltung zu sein. Es wird also ein Hauptförderstrom durch einen die mindestens eine Pumpenstufe umgebenden Ringraum erzeugt, d. h. der Hauptförderstrom wird am Ende der Pumpe durch diesen Ringraum in Richtung zur Saugseite der Pumpe geführt, so dass die Hauptkanalführung im Wesentlichen im Bereich der Pumpe und nicht an der Motorseite erfolgt. Um den Elektromotor zuverlässig und sicher zu kühlen, wird jedoch ein Kühlflüssigkeitsförderstrom vom Hauptförderstrom abgezweigt und durch einen den Motor umgebenden Raum geleitet.The basic idea of the solution according to the invention is, first of all, to use only a partial flow of the liquid conveyed by the centrifugal pump for cooling the motor, in order to be freer in design and design in this way in the ducting. Thus, a main flow is generated by a surrounding the at least one pump stage annulus, d. H. the main flow is led at the end of the pump through this annulus towards the suction side of the pump, so that the main duct is substantially in the area of the pump and not on the motor side. In order to cool the electric motor reliable and safe, however, a cooling liquid flow is diverted from the main flow and passed through a space surrounding the engine.
Zur Erzeugung dieses Kühlflüssigkeitsförderstroms wird in dem die mindestens eine Pumpenstufe umgebenden Ringraum ein Unterschied im Druckniveau erzeugt, in dem mindestens zwei Leitschaufeln vorgesehen sind, welche zumindest Teile dieses Ringraums in zwei Teilringräume unterteilen, die in Betrieb unterschiedliches Druckniveau aufweisen. Dabei sind gemäß der Erfindung diese Teilringräume jeweils mit dem den Motor umgebenden Raum leitungsverbunden. Durch die sich dabei in Betrieb einstellende, wenn auch nur geringe Druckdifferenz zwischen den Teilringräumen wird eine gezielte Strömung in dem den Motor umgebenden Raum erzeugt, und somit der erforderliche Kühlflüssigkeitsförderstrom sichergestellt.In order to generate this cooling liquid delivery flow, a difference in the pressure level is generated in the annular space surrounding the at least one pump stage, in which at least two guide vanes are arranged, which subdivide at least parts of this annular space into two partial annular spaces which have different pressure levels during operation. In this case, according to the invention, these partial annular spaces are each line-connected to the space surrounding the motor. By doing so in operation adjusting, albeit small pressure difference between the part ring spaces a targeted flow is generated in the space surrounding the engine, and thus ensures the required Kühlflüssigkeitsförderstrom.
Diese konstruktive Maßnahme stellt einerseits eine sichere Kühlung des Elektromotors sicher, erlaubt jedoch andererseits die Kanalführung so zu gestalten, dass Pumpeneingang und Pumpenausgang an derselben Seite liegen, dass zumindest der Hauptförderstrom durch einen die mindestens eine Pumpenstufe umgebenden Ringraum wieder Richtung Pumpeneingang zurückgeführt wird. Hierdurch ist eine sehr kompakte Konstruktion möglich, insbesondere wenn das erfindungsgemäße Kreiselpumpenaggregat Teil eines Hauswasserwerks bildet. Der Effekt des unterschiedlichen Druckniveaus in den beiden Teilräumen bildet sich insbesondere dann, wenn das Kreiselpumpenaggregat liegend, d. h. mit horizontaler Achse von Pumpe und Motor betrieben wird. Dann kann im unteren Teil des Ringraums ein höheres Druckniveau als im oberen Teilringraum bestehen, wodurch dieser Kühlflüssigkeitsförderstrom durch den Motor umgebenden Raum erzeugt wird. Dieser Effekt kann allerdings auch bei nicht horizontaler Anordnung erreicht werden, es müssen lediglich die hydraulischen Widerstände der Verbindungen zwischen dem einen Teilraum und dem Druckanschluß und zwischen dem anderen Teilraum und dem Druckanschluss unterschiedlich groß sein.On the one hand, this constructive measure ensures reliable cooling of the electric motor, but on the other hand makes it possible to configure the ducting so that the pump inlet and pump outlet are on the same side that at least the main flow through a the at least one pump stage surrounding annular space is returned to the pump inlet. As a result, a very compact construction is possible, especially when the centrifugal pump unit according to the invention forms part of a domestic waterworks. The effect of the different pressure levels in the two subspaces is formed in particular when the centrifugal pump assembly is lying, ie operated with a horizontal axis of the pump and motor. Then, in the lower part of the annular space, there may be a higher pressure level than in the upper part annular space, whereby this cooling liquid flow is generated by the space surrounding the engine. However, this effect can also be achieved in non-horizontal arrangement, it must be different in size only the hydraulic resistances of the connections between the one compartment and the pressure port and between the other compartment and the pressure port.
Vorteilhaft sind gemäß einer Weiterbildung der Erfindung die Leitschaufeln Teil der letzten Pumpenstufe oder dieser nachgeordnet. Sie sind vorzugsweise diametral im Ringraum angeordnet, und zwar bevorzugt derart, dass sie eine gedachte Teilungsebene bilden, welche den Ringraum der Pumpe zumindest teilweise vorzugsweise im Wesentlichen horizontal teilt.Advantageously, according to an embodiment of the invention, the vanes part of the last pump stage or this downstream. They are preferably arranged diametrically in the annular space, preferably in such a way that they form an imaginary dividing plane, which at least partially divides the annular space of the pump preferably substantially horizontally.
Vorteilhaft ist der Ringraum, der die mindestens eine Pumpenstufe umgibt, zumindest teilweise durch das Pumpengehäuse begrenzt. Die erfindungsgemäße Konstruktion kann dann weitgehend unter Ausnutzung ohnehin vorhandener Bauteile erfolgen.Advantageously, the annular space surrounding the at least one pump stage, at least partially limited by the pump housing. The construction according to the invention can then take place largely by utilizing already existing components.
Dabei ist es besonders vorteilhaft, wenn bei einer mehrstufigen Ausbildung der Kreiselpumpe die letzte Pumpenstufe durch das Kreiselrad mit den umgebenden normalen und den den Ringraum teilenden Leitschaufeln im Pumpengehäuse gebildet ist und die erste und gegebenenfalls weiteren Pumpenstufen dazwischen innerhalb eines Zylindermantels angeordnet sind, welcher den Ringraum der Pumpe nach innen begrenzt und der mindestens abschnittsweise durch die Leitschaufeln in axialer Richtung geteilt ist. Unter in axialer Richtung geteilt, ist zu verstehen, dass die durch die Leitschaufeln gebildete Teilungsebene durch die Pumpenachse verläuft oder parallel dazu und vorzugsweise horizontal angeordnet ist.It is particularly advantageous if, in a multi-stage design of the centrifugal pump, the last pump stage is formed by the impeller with the surrounding normal and the annular space dividing vanes in the pump housing and the first and optionally further pump stages are arranged therebetween within a cylinder jacket, which limits the annular space of the pump inwardly and which is divided at least in sections by the guide vanes in the axial direction. Divided in the axial direction, it is to be understood that the dividing plane formed by the vanes extends through or parallel to the pump axis and preferably horizontally.
Vorteilhaft sind diese den Ringraum teilenden Leitschaufeln so ausgebildet und angeordnet, dass sie sich in Richtung der Drehachse des Kreiselrades oder in einer Richtung parallel dazu erstrecken und somit in den Ringraum hineinragen, also gleichzeitig Teil des Leitapparates für die letzte Pumpenstufe und Trennmittel zur Erzeugung der Druckdifferenz für den Kühlflüssigkeitsförderstrom bilden. Erstrecken sich die Leitschaufeln in den Bereich zwischen Kreiselrad und einer Stirnwand, vorzugweise die das Pumpengehäuse begrenzenden Stirnwand, und zwar zu der Stirnwand, die dem Elektromotor nahe ist. Hierdurch wird eine vergleichsweise hohe Druckdifferenz der Teilringräume erreicht, da in diesem Bereich kein hydraulischer Kurzschluss entstehen kann. Bevorzugt werden dabei die Leitungsverbindungen zu dem den Motor umgebenden Raum durch Ausnehmungen in dieser Stirnwand des Pumpengehäuses gebildet.Advantageously, these vanes dividing the annulus are designed and arranged so that they extend in the direction of the axis of rotation of the impeller or in a direction parallel thereto and thus protrude into the annulus, ie at the same time part of the diffuser for the last pump stage and release means for generating the pressure difference form for the coolant flow. Extend the vanes in the area between the impeller and an end wall, preferably the end wall bounding the pump housing, to the end wall, which is close to the electric motor. As a result, a comparatively high pressure difference of the partial annular spaces is achieved, since no hydraulic short circuit can occur in this area. In this case, the line connections to the space surrounding the motor are preferably formed by recesses in this end wall of the pump housing.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung erstrecken sich die die Teilringräume bildenden Leitschaufeln radial längs der zum Elektromotor weisenden Stirnwand des Pumpengehäuses sowie axial längs einer den Ringraum nach außen begrenzenden Außenwand, vorzugsweise des Pumpengehäuses. Sie bilden somit einerseits Teil des Leitapparates der letzten Pumpenstufe und andererseits Wandungen, welche die Teilringräume zueinander abgrenzen. Vorteilhaft sind dabei diese Leitschaufeln einstückig mit dem Pumpengehäuse ausgebildet, welches sowohl die Stirnwand zum Elektromotor als auch die umgebende Außenwand aufweist.According to an advantageous embodiment of the invention, the guide vanes forming the partial annular spaces extend radially along the end wall of the pump housing facing the electric motor and axially along an outer wall defining the annular space, preferably the pump housing. They thus form, on the one hand, part of the diffuser of the last pump stage and, on the other hand, walls which delimit the partial annular spaces from each other. Advantageously, these vanes are integral with the pump housing formed, which has both the end wall to the electric motor and the surrounding outer wall.
Insbesondere bei der vorstehend beschriebenen Kanalführung, bei welcher die Förderflüssigkeit vom Saugmund der ersten Pumpenstufe bis zum Leitrad der letzten Pumpenstufe im Wesentlichen in Achsrichtung der Pumpe gefördert wird und dann durch den Ringkanal in Gegenrichtung, ist es vorteilhaft, die Pumpe als Radial- oder Radial/Axialkreiselpumpe auszubilden.In particular, in the above-described ducting, in which the pumped liquid is conveyed from the suction port of the first pump stage to the stator of the last pump stage substantially in the axial direction of the pump and then through the annular channel in the opposite direction, it is advantageous to use the pump as radial or radial / Form axial centrifugal pump.
Vorteilhaft ist die Pumpe zum Betrieb mit horizontal angeordneter Drehachse bestimmt und ausgebildet, wobei die den Ringraum der Pumpe unterteilenden Leitschaufeln sich im Wesentlichen in einer horizontalen Ebene erstrecken, in welcher auch die Drehachse liegt oder parallel und/oder leicht schräg dazu (bis maximal 30° dazu) verläuft.The pump is advantageously intended and designed for operation with a horizontally arranged axis of rotation, wherein the guide vanes dividing the annulus of the pump essentially extend in a horizontal plane in which the axis of rotation lies or parallel and / or slightly oblique (up to a maximum of 30 °) to) runs.
Dabei ist es von Vorteil, wenn Motor und Pumpe eine gemeinsame Welle aufweisen und der Ringraum der Pumpe in Flucht zu dem den Motor umgebenden Raum angeordnet ist, der vorzugsweise ebenfalls als Ringraum ausgebildet ist.It is advantageous if motor and pump have a common shaft and the annular space of the pump is arranged in alignment with the space surrounding the motor, which is preferably also designed as an annular space.
Die vorstehend beschriebenen konstruktiven Ausgestaltungen sind insbesondere von Vorteil bei Einsatz des erfindungsgemäßen Kreiselpumpenaggregats in einem Hauswasserwerk. Das Hauswasserwerk kann durch diese konstruktiven Merkmale wesentlich günstiger gestaltet werden, sowohl hinsichtlich der Herstellung und Montage als auch hinsichtlich seiner Handhabung. So weist das erfindungsgemäße Hauswasserwerk ein solches Kreiselpumpenaggregat auf und hat seinen Sauganschluss und seinen Druckanschluss an derselben Seite angeordnet, vorzugsweise übereinander an einer Stirnseite des umgebenden Gehäuses. Diese Anordnung ist möglich, da der Förderstrom durch den Ringraum der Pumpe in Richtung Saugseite zurückgeleitet wird, so dass der Druckanschluss des Hauswasserwerks ohne aufwändige interne Kanalführungen an derselben Seite wie der Sauganschluss sein kann.The constructive embodiments described above are particularly advantageous when using the centrifugal pump assembly according to the invention in a domestic waterworks. The domestic waterworks can be made much cheaper by these structural features, both in terms of manufacturing and assembly and in terms of its handling. Thus, the domestic waterworks according to the invention such a centrifugal pump unit and has its suction port and its pressure port arranged on the same side, preferably one above the other at an end face of the surrounding housing. This arrangement is possible because the flow through the annular space of the pump is returned in the direction of the suction side, so that the pressure connection of the domestic waterworks can be without elaborate internal ducting on the same side as the suction connection.
Gemäß einer vorteilhaften Weiterbildung der Erfindung weist das Hauswasserwerk ein umgebendes Gehäuse auf, in dem Pumpe und Motor unten, ein Membrandruckbehälter und die Motorelektronik darüber und oben angeordnet sind. Dabei ist vorteilhafterweise die Motorelektronik über dem Motor und der Membrandruckbehälter über der Pumpe angeordnet. Auf diese Weise sind auch innerhalb des Gehäuses des Hauswasserwerks elektrische und hydraulische Baugruppen örtlich voneinander getrennt, was von Vorteil ist. Dabei kann in vorteilhafter Weiterbildung die Kanalführung an die Seite des Pumpengehäuses gelegt werden, an welcher sich Saug- und Druckanschluss befinden.According to an advantageous embodiment of the invention, the domestic water plant on a surrounding housing, in the pump and motor below, a diaphragm pressure vessel and the engine electronics are arranged above and above. In this case, the engine electronics over the engine and the diaphragm pressure vessel is advantageously arranged above the pump. In this way, electrical and hydraulic assemblies are locally separated from each other within the housing of the domestic water plant, which is beneficial. In this case, in an advantageous embodiment, the channel guide can be placed on the side of the pump housing to which the suction and pressure connection are located.
Die Erfindung ist nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:
- Fig. 1
- ein Hauswasserwerk mit einer Kreiselpumpe in stark vereinfachter Darstellung im Längsschnitt,
- Fig. 2
- eine perspektivische Ansicht eines Teils des Pumpengehäuses innerhalb des Hauswasserwerks,
- Fig. 3
- den Teil des Pumpengehäuses gemäß
Fig. 2 im Längsschnitt, - Fig. 4
- in perspektivischer Darstellung den Teil des Pumpengehäuses gemäß
Fig. 3 mit darin angeordneten Pumpenstufen und - Fig. 5
- den Verlauf der Förderströme innerhalb des Hauswasserwerks im Betrieb in einer Darstellung entsprechend
Fig. 1 .
- Fig. 1
- a domestic waterworks with a centrifugal pump in a very simplified representation in longitudinal section,
- Fig. 2
- a perspective view of a portion of the pump housing within the domestic waterworks,
- Fig. 3
- the part of the pump housing according to
Fig. 2 in longitudinal section, - Fig. 4
- in a perspective view of the part of the pump housing according to
Fig. 3 with arranged therein pump stages and - Fig. 5
- the course of the flow within the domestic waterworks in operation in a representation accordingly
Fig. 1 ,
Das Hauswasserwerk 1 weist ein Gehäuse 2 auf, in dem sämtliche Bauteile des Hauswasserwerks eingegliedert sind und das einen Fuß 3 hat, mit welchem das Hauswasserwerk 1 auf einer zum Beispiel Bodenfläche steht und gegebenenfalls in dieser zum Beispiel durch Schrauben verankert ist.The domestic waterworks 1 has a
Das Hauswasserwerk 1 weist an seiner in
Der untere Teil des Gehäuses 2 wird durch eine mehrstufige Kreiselpumpe 7 und einen diese antreibenden Elektromotor 8 ausgefüllt, die liegend angeordnet, das heißt eine im Betrieb horizontale Welle 9 aufweisen, welche einerseits den Rotor des Elektromotors 8 und andererseits Kreiselräder 10 der Kreiselpumpe 7 aufnimmt.The lower part of the
Die hier vierstufige Kreiselpumpe ist in den ersten drei Stufen geschlossen ausgebildet, das heißt der sich an das jeweilige Laufrad anschließende Leitapparat ist von einer Zylinderwand 11 umgeben, welche die Innenwand eines Ringraumes 12 bildet, dessen Außenwand durch das Pumpengehäuse gebildet wird. Das Pumpengehäuse ist im Wesentlichen aus zwei Gehäuseteilen gebildet, nämlich einem topfförmigen Gehäuseteil 13 sowie einem den Saugmund der Pumpe bildenden Gehäuseteil 14. Das Gehäuseteil 14 ist als Kunststoffspritzgussteil ausgebildet, bildet die den Sauganschluss 4 und den Druckanschluss 5 umfassende Seite des Hauswasserwerks 1 und weist einen vom Ringraum 12 zum Druckanschluss 5 führenden Kanal 15 auf, der ein Rückschlagventil 16 aufnimmt und an seinem freien Ende an der Oberseite des Gehäuses 2 mündet, wo er durch einen Verschlussstopfen 17 abgeschlossen ist. Der Druckanschluss 5 schließt an diesem Kanal 15 in Strömungsrichtung hinter dem Rückschlagventil 16 quer an. Um 180° versetzt dazu, quer ist ein Anschluss 18 vorgesehen, an dem ein Membrandruckbehälter 19 anschließt, welcher den Druckspeicher des Hauswasserwerkes 1 bildet. Der Membrandruckbehälter 19 ist oberhalb der Pumpe 7 angeordnet, rückseitig an diesen schließt sich ein Elektronikgehäuse 30 an, welches über dem Elektromotor 8 angeordnet ist und die gesamte Steuer- und Regelelektronik des Hauswasserwerkes 1 aufnimmt.The here four-stage centrifugal pump is designed to be closed in the first three stages, that is, the adjacent to the respective impeller diffuser is surrounded by a
Im Betrieb gelangt das Wasser durch den Sauganschluss 4 in das Gehäuseteil 14, also zum Saugmund der Pumpe 7, von dort nachfolgend durch die einzelnen Pumpenstufen bis zum letzten Laufrad, von wo es über den weiter unten noch beschriebenen offenen Leitapparat in einem Hauptförderstrom 29 um 180° in den Ringraum 12 umgeleitet wird, um von dort über den vertikalen Kanal 15 durch das Rückschlagventil 16 zum Druckanschluss 5 zu gelangen, wo es das Hauswasserwerk 1 verlässt.In operation, the water passes through the suction port 4 in the
Um einen Teilstrom zu erzeugen, der den Kühlflüssigkeitsstrom 30 für den Motor 8 bildet, ist das letzte Kreiselrad 10 von Leitschaufeln 21 und 22 umgeben. Bei den Leitschaufeln 21 handelt es sich um übliche Leitschaufeln, welche das Kreiselrad radial umgebend angeordnet sind und von Ausgestaltung und Funktion üblichen Leitschaufeln entsprechen. Die Leitschaufeln 22 jedoch, die um 180° versetzt (bezogen auf die Drehachse der Pumpe) angeordnet sind, sind in Axialrichtung bis in dem Ringraum 12 hinein verlängert, sie teilen den Ringraum 12 in zwei Ringraumteile, nämlich einen unteren Teilringraum 23 und einen oberen Teilringraum 24. Diese den Ringraum 12 teilenden Leitschaufeln 22 erstrecken sich axial von einer Stirnwand 25 des topfförmigen Gehäuseteils 13 an der Außenwand entlang bis nahe zum Ende des Gehäuseteils 13, also dort wo dieses an das Gehäuseteil 14 angeflanscht ist. Nach innen reichen die Leitschaufeln 22 bis an die Zylinderwand 11 heran, so dass zumindest im Bereich der Zylinderwand 11 der Ringraum 12 durch die Leitschaufeln 22 etwa horizontal geteilt ist. Im Bereich des letzten Laufrades sind die Leitschaufeln 22 nach innen hin wie die Leitschaufeln 21 ausgebildet.In order to generate a partial flow, which forms the cooling
Durch diese Teilung des Ringraums 12, zumindest im Bereich des topfförmigen Gehäuseteils 13, entsteht im Betrieb ein unterschiedliches Druckniveau in den Teilringräumen 23 und 24, wobei im unteren Teilringraum 23 ein höherer Druck herrscht als im oberen Teilringraum 24. Die Unterschiede sind vergleichsweise gering, da zum saugseitigen Ende des Ringraums 12 die Teilringräume 23 und 24 hydraulisch verbunden sind.By this division of the
Der topfförmige Gehäuseteil 13 weist eine zentrale Ausnehmung 26 für die Durchführung und Lagerung der Welle 9 auf. Diese Ausnehmung 26 umgebend erstreckt sich die Stirnwand 25 bis zur im Wesentlichen zylindrischen Außenseite des Gehäuseteils 13. In dieser Stirnwand 25 sind im Bereich fluchtend zu dem Ringraum 12 im unteren Teilringraum 23 sowie im oberen Teilringraum 24 Ausnehmungen 27, die zu einem daran anschließenden, den Stator des Elektromotors 8 umgebenden Ringraum 28 führen. Diese Ausnehmungen 27 dienen dazu, den Kühlflüssigkeitsstrom 30, welcher durch das unterschiedliche Druckniveau in den Teilringräumen 23 und 24 erzeugt wird, vom unteren Teilringraum 23 in den unteren Teil des den Elektromotor 8 umgebenden Ringraums 28 gelangen zu lassen, von dort nach oben und durch die oberen Ausnehmungen 27 in der Stirnwand 25 in den oberen Teilringraum 24 fließen zu lassen um dann von dort in den Hauptförderstrom zu gelangen. Dieser durch die Leitschaufeln 22 erzeugte Druckunterschied zwischen dem unteren und dem oberen Teilringraum 23, 24 reicht aus, um einen ausreichenden Kühlflüssigkeitsstrom 30 durch den Ringraum 28 und damit eine ausreichende Kühlung des Elektromotors 8 zu erzeugen.The cup-shaped
- 11
- HauwasserwerkHauwasserwerk
- 22
- Gehäuse von 1Housing of 1
- 33
- Fußfoot
- 44
- Sauganschlusssuction
- 55
- Druckanschlusspressure connection
- 66
- Ablassöffnungdrain hole
- 77
- Kreiselpumperotary pump
- 88th
- Elektromotorelectric motor
- 99
- Wellewave
- 1010
- Kreiselräderimpellers
- 1111
- Zylinderwandcylinder wall
- 1212
- Ringraumannulus
- 1313
- topfförmiger Gehäuseteil des Pumpengehäusescup-shaped housing part of the pump housing
- 1414
- Gehäuseteil des PumpengehäusesHousing part of the pump housing
- 1515
- Kanalchannel
- 1616
- Rückschlagventilcheck valve
- 1717
- Verschlussstopfensealing plug
- 1818
- Anschluss für MembrandruckbehälterConnection for diaphragm pressure vessel
- 1919
- MembrandruckbehälterDiaphragm pressure vessel
- 2020
- Elektronikgehäuseelectronics housing
- 2121
- normale Leitschaufelnnormal vanes
- 2222
- teilende Leitschaufelndividing vanes
- 2323
- unterer Teilringraumlower part-ring space
- 2424
- oberer TeilringraumUpper part-ring space
- 2525
- Stirnwandbulkhead
- 2626
- zentrale Ausnehmungcentral recess
- 2727
- Ausnehmungen in der StirnwandRecesses in the front wall
- 2828
- Ringraumannulus
- 2929
- HauptförderstromMain flow
- 3030
- KühlflüssigkeitsstromCoolant flow
Claims (13)
Priority Applications (4)
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EP15189912.7A EP3156663B1 (en) | 2015-10-15 | 2015-10-15 | Centrifugal pump assembly |
RU2016140464A RU2641328C1 (en) | 2015-10-15 | 2016-10-14 | Centrifugal pumping unit |
CN201610899949.9A CN107013469B (en) | 2015-10-15 | 2016-10-14 | Centrifugal pump assembly |
US15/294,020 US10400792B2 (en) | 2015-10-15 | 2016-10-14 | Centrifugal pump assembly comprising at least one impeller producing flow through and an annular space divided by at least two guide vanes into part-annular-spaces |
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EP (1) | EP3156663B1 (en) |
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IT202000004879A1 (en) * | 2020-03-09 | 2021-09-09 | Dab Pumps Spa | EASY MAINTENANCE VERTICAL ELECTRIC PUMP |
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- 2015-10-15 EP EP15189912.7A patent/EP3156663B1/en active Active
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- 2016-10-14 US US15/294,020 patent/US10400792B2/en active Active
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JPS51154703U (en) * | 1975-05-31 | 1976-12-09 | ||
DE69406259T2 (en) * | 1993-12-28 | 1998-05-07 | Ebara Corp | Motor pump arrangement |
EP0831236A2 (en) * | 1996-09-24 | 1998-03-25 | WILO GmbH | Motor pump with cooled frequency converter |
EP1217217A1 (en) * | 2000-12-22 | 2002-06-26 | Grundfos a/s | Water supply installation |
Also Published As
Publication number | Publication date |
---|---|
US20170108007A1 (en) | 2017-04-20 |
RU2641328C1 (en) | 2018-01-17 |
US10400792B2 (en) | 2019-09-03 |
CN107013469B (en) | 2020-03-17 |
CN107013469A (en) | 2017-08-04 |
EP3156663B1 (en) | 2019-07-24 |
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