EP2227638A1 - Zentrifugalpumpe mit einer erhöhten betriebssicherheit - Google Patents
Zentrifugalpumpe mit einer erhöhten betriebssicherheitInfo
- Publication number
- EP2227638A1 EP2227638A1 EP08849348A EP08849348A EP2227638A1 EP 2227638 A1 EP2227638 A1 EP 2227638A1 EP 08849348 A EP08849348 A EP 08849348A EP 08849348 A EP08849348 A EP 08849348A EP 2227638 A1 EP2227638 A1 EP 2227638A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- centrifugal pump
- housing
- motor
- electric 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
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
- 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
- F04D13/0646—Units comprising pumps and their driving means the pump being electrically driven the hollow pump or motor shaft being the conduit for the working fluid
-
- 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
- F04D13/0666—Units comprising pumps and their driving means the pump being electrically driven the motor being of the plane gap type
Definitions
- the present invention relates to an electric centrifugal pump for conveying a fluid, in particular for conveying fuel to an aircraft engine, with a housing in which a rotor shaft is rotatably mounted and on which a blast wheel for conveying the fuel is arranged, wherein for rotational drive of the rotor shaft a motor arrangement is provided around a rotor axis.
- Centrifugal pumps have a design according to which the fluid to be delivered is sucked in axially from the direction of the rotor axis and flows off radially via the centrifugal wheel.
- the housings of the electric centrifugal pumps are adapted to the fluid flow path, and generally surround the centrifugal wheel on the periphery.
- pump assemblies which are connected via a drive shaft with an electric motor.
- shaft sealing elements are required to seal the rotating shaft against the housing.
- Such shaft sealing elements have a high tendency to wear, which can result in the promotion of fuel special hazards when the fuel can escape from a damaged sealing element.
- wet runner pumps are known in which the motor assembly is already arranged within the housing of the centrifugal pump.
- a drive shaft extends between the motor assembly and the spinner so that the motor assembly is disposed at the first end and the spinner is disposed at the opposite second end of the drive shaft. Consequently, there is a large design of the centrifugal pump, often the housing between the region of the motor assembly and the region of the impeller has a dividing plane.
- Newer pump concepts for fuel delivery systems for jet engines of aircraft provide an electric drive, which drives a pump module via a drive shaft. Both failure of the engine assembly and failure of the sealing elements between the engine assembly and the centrifugal pump can result in failure of the fuel delivery to the aircraft engine.
- a fuel pump drive for an aircraft engine which has a pump motor which drives a fuel pump via a pump shaft.
- the sealing of the rotating pump shaft to the pump housing via radial shaft sealing elements which have a tendency to wear, which can lead to failure of the fuel pump drive.
- the invention includes the technical teaching that the spinner has at least one rotor and at least one stator is arranged plane-parallel adjacent to the rotor in the housing, so that the rotor forms the motor assembly with the stator.
- an electric centrifugal pump with a blast wheel which is simultaneously designed as a rotor or as a carrier of the rotor of a motor assembly, leads to a very compact design of the pump.
- the advantage is achieved that no drive shaft is present between the motor assembly and the impeller, which must be sealed by radial shaft sealing elements against the housing.
- the electric centrifugal pump according to the invention is particularly suitable for conveying fuel from a fuel tank to an aircraft engine.
- This pump concept can be used both as a forepump in combination with a mechanically driven pump via the aircraft engine and as the only existing pump between the fuel tank and the aircraft engine.
- the housing of the centrifugal pump encloses according to the invention both the impeller and the motor assembly, so that no dynamic sealing is required, but only an inlet and outlet must be sealed by means of a static sealing element.
- a rotor and a stator for forming respective motor modules are arranged on both sides of the centrifugal wheel, which together form the motor assembly.
- other motor modules be provided, so that an electrically redundant motor concept is provided, which has a lower probability of failure.
- the blast wheel consists of two plane-parallel discs, between which there are blade elements for conveying the fuel.
- the discs of the blast wheel can either form the rotor of the motor assembly itself, or the rotor is arranged on each of the two discs of the blast wheel and has an annular structure.
- the pumped fluid flows around the motor assembly, so that it is designed in the manner of a wet rotor.
- the advantage is achieved that within the housing no sealing elements are required to seal about the motor assembly against the spinner.
- Another advantage is the effect of cooling, since the pumped fluid, in particular the fuel delivered to the aircraft engine, causes a cooling effect of the engine assembly.
- the fuel flows around both the rotor and the stator, on which at least one winding body is accommodated. During electrical operation of the motor assembly, the winding body can heat up, so that the resulting amount of heat is dissipated by the fuel. The likelihood of a winding fire or a short circuit within the winding body is reduced by the wet-runner concept.
- a further advantageous embodiment of the electric centrifugal pump has a rotor shaft, which is designed as a hollow shaft, wherein the fluid to be delivered enters axially into the hollow shaft. It is sufficient that the hollow shaft has an opening at least on one side in the direction of the rotor axis, into which the fuel flows as fluid to be conveyed from the direction of the rotor axis into the cavity of the hollow shaft.
- the hollow shaft can be made in one piece with the blast wheel, wherein the hollow shaft is rotatably supported by means of a roller bearing within the housing.
- the impeller is fluidically connected to the hollow shaft, so that the fluid from the hollow shaft enters the impeller and flows to promote this radially.
- the centrifugal pump is thus designed as an axial-radial pump, because the fluid to be pumped flows axially against the pump and flows radially out of this.
- the erfmdungshiele embodiment of the rotor shaft as a hollow shaft with a fluidically connected to the interior of the hollow shaft impeller and the arrangement of the rotor of the motor assembly in or on the impeller provides a very compact design of a centrifugal pump, in which the rotor of the motor assembly and the impeller of the pump running integrated integrated are.
- the bearing of the rotor of the motor assembly and the impeller of the pump is also made by the double executed rolling bearing at the front and rear ends of the rotor shaft, wherein the storage is also surrounded by the fluid to be pumped.
- This can be carried out either as an encapsulated storage, wherein advantageously also the storage is lubricated by the fluid to be delivered. Consequently, the mechanical failure of the roller bearing is to be regarded as very low, since at least overheating the roller bearing can be excluded.
- the housing encloses according to the embodiment of the invention, the rotor shaft radially and on one side axially.
- the housing has an open and a closed end, wherein the housing for the axial flow of the rotor shaft through the fluid to be conveyed has a concentrically formed around the rotor axis housing flange which is opposite to the closed side of the housing in the direction of the rotor axis, said to be pumped fluid enters the housing through the housing flange, wherein the housing via the housing flange to a receptacle can be flanged and sealed against this. Consequently, the housing has only a fluid inlet and a fluid outlet, so that consequently only static seals are required.
- the housing is preferably designed in two parts, wherein the dividing plane of the two housing halves lies in the plane of extent of the centrifugal wheel. This results in a simplified assembly of the centrifugal pump and in particular the integrated motor assembly, wherein the assembly can be made from the direction of the motor axis.
- the connection of the two housing halves can be done by screw elements, wherein Furthermore, a sealing element is provided in the dividing plane for sealing the housing halves against each other.
- the motor modules have at least one winding body, which is connected to a respective associated power electronics for supply and control, wherein the power electronics in the case of a winding short circuit allows a shutdown of the short-circuited winding body. Due to the separate connection of the individual motor modules, a redundant structure of the motor assembly is possible.
- a motor module comprises at least one rotor and a stator with a winding body, which can drive the centrifugal pump even when operating alone. To further increase the reliability of the electric centrifugal pump, a separate power electronics is provided for each engine module and connected to this.
- the electrical control of the centrifugal pump includes a number of power electronics units according to the number of motor modules.
- the power electronics are designed in such a way that a winding body is switched off as soon as a winding short circuit results in the corresponding winding body.
- a winding fire can be avoided, since the defective winding body is switched off immediately and no further electrical energy input can take place.
- the induction of a voltage can be avoided, which can also lead to a temperature increase within a short-circuited winding body.
- the rotors may be designed in the manner of a type, annular disk rotors, which may have one-sided grooved short-circuit cages.
- An advantageous embodiment of the motor modules can be achieved by a type of axial flux machine, which is designed as an asynchronous motor or as a reluctance motor with one-sided slotted star rotors.
- centrifugal pump has rotors, which are designed as magnetic rotors with permanent magnets inserted.
- the permanent magnets can also be used directly in the blast wheel, this from made of a magnetic material.
- the permanent magnets can be arranged on the circumference of the impeller in the lateral direction equally spaced from each other, wherein the arrangement by a screw, sticking or wedging in the impeller is possible. The torque generated by the arrangement of an axial flux machine thus formed is transmitted directly to the spinner, so that it is rotated together with the rotor shaft in rotation.
- a further increase in the reliability is achieved in that the individual motor modules of a rotor and a stator have a rated power, which is sufficient in each case for driving the pump. In particular, consequential damage can be avoided in this way, since a shutdown of a short-circuited motor winding can not cause a fire or the like.
- the power electronics associated with the motor module can be designed in such a way that it allows a minimum or maximum power consumption of the motor winding, within which the motor modules are operated. If the parameters of the supply of the individual motor modules leave the preset minimum and maximum values, the motor module can be automatically switched off.
- the motor module, which drives the pump as the remaining motor module can be controlled by a correspondingly higher power to compensate for the failure of the defective motor module. Consequently, defying a failure of a separate motor winding, there is no failure or interruption of the fuel supply to the aircraft engine, allowing for maximum operational safety.
- Figure 1 is a cross-sectional view of a centrifugal pump according to the invention, each with a left side and right side arranged by the impeller engine module consisting at least of a rotor and a stator with an associated winding body and
- Figure 2 shows a motor assembly with a total of four motor modules, each consisting of a stator and a rotor.
- FIG. 1 shows an electric centrifugal pump according to the invention, which is identified by the reference numeral 1. This is shown in half section, wherein the rotor axis 5 forms the line of symmetry and only the upper half section is shown.
- the housing 2 is made in two parts and has a closed rear part and an open front part. The opening of the front part of the housing 2 is formed by the housing flange 8, through which the fluid to be delivered can flow into the housing 2.
- the fluid flow path 10 is marked with an arrow, wherein the fluid after entry into the housing 2 first enters into a rotor shaft 3, which is designed as a hollow shaft. On the rotor shaft 3, a blast wheel 4 is arranged, which is fluidly connected to the inner region of the hollow shaft.
- the impeller 4 has the structure of a face plate, wherein according to the embodiment of the invention, the electric centrifugal pump both on the left side and on the right side of the outer plan face of the impeller 4 per a rotor 6 is arranged.
- a respective stator 7 is arranged plane-parallel to the left-side and right-side rotor 6, on which a winding body 9 is applied.
- a torque is generated which acts on the rotor 6. Consequently, the blast wheel 4 is set in a rotational movement, so that it is driven in rotation together with the rotor shaft 3.
- the rotor shaft 3 is mounted in a rolling bearing 11 within the housing 2, so that the centrifugal pump requires no dynamic seals.
- the rotating component is integrated only within the housing 2, and no drive shaft emerges from the housing to drive the spinner 4.
- the electric centrifugal pump 1 is designed as a wet rotor, so that both the motor modules and the bearing 11 are exposed to the fluid to be delivered.
- the fluid flows around both the bearing 11 and the rotors 6 and stators 7 and the winding body 9, and produces a cooling effect. Consequently, a failure of the centrifugal pump 1 due to the overheating of a winding body 9 or a rolling bearing 11 is unlikely, so that in this way the reliability is further increased.
- FIG. 2 shows another embodiment of a possible motor assembly, which consists of a total of four motor modules.
- Each motor module has a rotor 6 and a stator 7, on each of which a winding body 9 is applied.
- the representation of the winding body 9 is shown symbolically, wherein this has a star connection.
- the rotors 6 are designed as double-acting rotors, so that it forms a respective motor module with both the left-side and the right-side adjacent stator 7.
- the double arrangement of two stators 7 and a rotor 6 is provided twice on the rotor shaft, so that here too the redundancy causes an increase in the reliability.
- the illustrated rotors 6 may be respective centrifugal wheels, so that the centrifugal pump 1 has a total of two centrifugal wheels.
- the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007054947A DE102007054947A1 (de) | 2007-11-17 | 2007-11-17 | Zentrifugalpumpe mit einer erhöhten Betriebssicherheit |
PCT/DE2008/001840 WO2009062474A1 (de) | 2007-11-17 | 2008-11-07 | Zentrifugalpumpe mit einer erhöhten betriebssicherheit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2227638A1 true EP2227638A1 (de) | 2010-09-15 |
EP2227638B1 EP2227638B1 (de) | 2012-08-01 |
Family
ID=40433907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08849348A Not-in-force EP2227638B1 (de) | 2007-11-17 | 2008-11-07 | Zentrifugalpumpe mit einer erhöhten betriebssicherheit |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110008195A1 (de) |
EP (1) | EP2227638B1 (de) |
JP (1) | JP5518729B2 (de) |
CA (1) | CA2705915A1 (de) |
DE (1) | DE102007054947A1 (de) |
WO (1) | WO2009062474A1 (de) |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB582036A (en) * | 1944-07-07 | 1946-11-01 | Maldwyn Lewis Thomas | Improved combined pump and electric motor unit |
DE1638272B2 (de) * | 1968-03-02 | 1975-05-28 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Pumpe mit Spaltrohrmotor |
JPS58163255A (ja) * | 1982-03-24 | 1983-09-28 | Okuma Mach Works Ltd | 永久磁石式同期モ−タの回転子 |
US5130616A (en) * | 1990-11-13 | 1992-07-14 | Southwest Electric Company | Motor control system and components thereof |
WO1996018817A1 (en) * | 1994-12-14 | 1996-06-20 | The Ingersoll-Dresser Pump Company | Impeller |
US5769069A (en) * | 1995-06-07 | 1998-06-23 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Natural Resources | Low flow-rate pump |
DE59603933D1 (de) * | 1995-08-24 | 2000-01-20 | Sulzer Electronics Ag Winterth | Elektromotor |
DE19608602A1 (de) * | 1996-03-06 | 1997-09-11 | Peter Dipl Ing Mette | Stopfbuchslose Strömungsmaschine mit einem Laufrad radialer Bauart |
US6254359B1 (en) * | 1996-05-10 | 2001-07-03 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method for providing a jewel bearing for supporting a pump rotor shaft |
US5737164A (en) * | 1996-07-11 | 1998-04-07 | Sundstrand Corporation | Switched reluctance machine capable of improved fault operation |
FR2788313B1 (fr) * | 1999-01-13 | 2001-03-30 | Technicatome | Pompe centrifuge a moteur discoidal integre destinee a la circulation d'ammoniac dans un satellite |
DE19908531A1 (de) | 1999-02-28 | 2000-09-07 | Mtu Muenchen Gmbh | Kraftstoffpumpenantrieb eines Flugtriebwerks und Flugtriebwerk |
US6675570B2 (en) | 2000-06-15 | 2004-01-13 | Argo-Tech Corporation | Low-cost general aviation fuel control system |
DE10330434A1 (de) * | 2003-07-04 | 2005-02-03 | Jostra Ag | Zentrifugal-Pumpe |
US7468876B2 (en) * | 2006-01-06 | 2008-12-23 | Inpower Llc | Safety switch |
-
2007
- 2007-11-17 DE DE102007054947A patent/DE102007054947A1/de not_active Withdrawn
-
2008
- 2008-11-07 EP EP08849348A patent/EP2227638B1/de not_active Not-in-force
- 2008-11-07 WO PCT/DE2008/001840 patent/WO2009062474A1/de active Application Filing
- 2008-11-07 CA CA2705915A patent/CA2705915A1/en not_active Abandoned
- 2008-11-07 JP JP2010533425A patent/JP5518729B2/ja not_active Expired - Fee Related
- 2008-11-07 US US12/743,219 patent/US20110008195A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2009062474A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009062474A1 (de) | 2009-05-22 |
CA2705915A1 (en) | 2009-05-22 |
EP2227638B1 (de) | 2012-08-01 |
DE102007054947A1 (de) | 2009-05-20 |
JP2011503425A (ja) | 2011-01-27 |
US20110008195A1 (en) | 2011-01-13 |
JP5518729B2 (ja) | 2014-06-11 |
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