EP2242928A1 - Fastening of the rotor of a centrifugal pump - Google Patents

Fastening of the rotor of a centrifugal pump

Info

Publication number
EP2242928A1
EP2242928A1 EP09701807A EP09701807A EP2242928A1 EP 2242928 A1 EP2242928 A1 EP 2242928A1 EP 09701807 A EP09701807 A EP 09701807A EP 09701807 A EP09701807 A EP 09701807A EP 2242928 A1 EP2242928 A1 EP 2242928A1
Authority
EP
European Patent Office
Prior art keywords
impeller
bushing
beads
axially parallel
rotor
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
Application number
EP09701807A
Other languages
German (de)
French (fr)
Other versions
EP2242928B1 (en
Inventor
Laurent Costaouec
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
Original Assignee
Wilo AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wilo AG filed Critical Wilo AG
Publication of EP2242928A1 publication Critical patent/EP2242928A1/en
Application granted granted Critical
Publication of EP2242928B1 publication Critical patent/EP2242928B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • F04D29/20—Mounting rotors on shafts
    • 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
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F04D29/2227—Construction and assembly for special materials
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
    • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding

Definitions

  • the invention relates to a manufactured of sheet metal impeller of a particular multi-stage centrifugal pump with means for attachment to the drive shaft of an electric motor.
  • the object of the invention is to provide an impeller of the type mentioned above with a fastening for the electric motor shaft, which achieves optimum power transmission and accurate position of the impeller with a simple design and installation.
  • the impeller has a central coaxial opening in which a sleeve is coaxially mounted, that the sleeve protrudes at least on an impeller side of the impeller, and that the bush in its inner wall axially parallel beads for attachment in axially parallel notches or grooves of the engine drive shaft.
  • the socket takes on both the task of transmitting forces and the determination of the exact position of the impeller or the distances between the wheels to each other.
  • high torques are transferable to the impeller and it is achieved a low material consumption.
  • This design is used in running wheels made of sheet metal, with a low weight is achieved.
  • a particularly simple construction with high torque transmission is achieved when the beads are formed by notches introduced externally into the socket wall. Furthermore, it is advantageous if the paraxial beads are formed in front of a protruding from the impeller region of the socket. It is also proposed that the length of the beads is 10 to 60% of the length of the bushing.
  • a coaxial annular bead protrudes on the bush outer wall.
  • the annular bead may be arranged in a central region of the socket.
  • the bushing in the central impeller opening is welded in particular by laser welding.
  • FIG. 1 is a perspective view of a first embodiment of the socket
  • Fig. 5 is a view of the front of the impeller in the
  • Impeller suction opening extending into and beyond projecting socket with inwardly projecting beads
  • Fig. 6 is a view of the back of the impeller.
  • An impeller made of sheet metal of a centrifugal pump has a central coaxial opening, with which the impeller is mounted on the shaft 1 of an electric motor, not shown.
  • a bushing 2 is provided, which is formed by a pipe section and which rests in the opening 3 of the impeller 4.
  • the sleeve 2 is in this case inserted so far into the impeller opening 3 until a protruding from the socket 2 outside coaxial annular bead 5 rests on the edge of the opening 3.
  • the sleeve 2 is attached to the impeller opening edge by laser welding.
  • the annular bead 5 is produced by upsetting the bushing wall 2.
  • axially parallel notches 6 are pressed from the outside into the socket wall 2, are formed by the axially parallel protruding beads 7 in the inner wall of the socket 2.
  • four axially parallel beads 7 protrude at the inner side of the sleeve 2 at the same distance of 90 degrees, wherein the shaft 1 at the same four places each have a notch or groove 8, in which the beads 7 protrude positively , So that a secure fit between shaft 1 and socket 2 is formed with the impeller 4.
  • the sockets 2 are designed differently long, as shown in FIG. 4.

Abstract

The invention relates to a rotor, which is produced from sheet metal, of an in particular multi-stage centrifugal pump, having means for fastening to the drive shaft of an electric motor, wherein the rotor has a central coaxial opening in which a sleeve is fastened coaxially, wherein the sleeve projects out of the rotor at at least one side of the rotor, and wherein the sleeve has, in its inner wall, projecting, axially parallel beads for fastening in axially parallel notches or grooves of the motor drive shaft.

Description

Befestigung des Laufrades einer Kreiselpumpe Attachment of the impeller of a centrifugal pump
Die Erfindung betrifft ein aus Blech gefertigtes Laufrad einer insbesondere mehrstufigen Kreiselpumpe mit Mitteln zum Befestigen an der Antriebswelle eines Elektromotors.The invention relates to a manufactured of sheet metal impeller of a particular multi-stage centrifugal pump with means for attachment to the drive shaft of an electric motor.
Es sind die unterschiedlichsten Befestigungsarten für Laufräder von Pumpen bekannt. Sie erfordern in der Regel mehrere Teile, eine aufwendige Montage und einen erheblichen Materialverbrauch.There are a variety of types of mounting for wheels of pumps known. They usually require several parts, a complex installation and a significant material consumption.
Aufgabe der Erfindung ist es, ein Laufrad der eingangs genannten Art mit einer Befestigung für die Elektromotorenwelle zu schaffen, das bei einfacher Konstruktion und Montage eine optimale Kräfteübertragung und eine genaue Position des Laufrades erreicht.The object of the invention is to provide an impeller of the type mentioned above with a fastening for the electric motor shaft, which achieves optimum power transmission and accurate position of the impeller with a simple design and installation.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Laufrad eine mittige koaxiale Öffnung aufweist, in der eine Buchse koaxial befestigt ist, dass die Buchse zumindest auf einer Laufradseite aus dem Laufrad vorsteht, und dass die Buchse in ihrer Innenwand achsparallele Wülste zur Befestigung in achsparallelen Kerben oder Nuten der Motorenantriebswelle aufweist.This object is achieved in that the impeller has a central coaxial opening in which a sleeve is coaxially mounted, that the sleeve protrudes at least on an impeller side of the impeller, and that the bush in its inner wall axially parallel beads for attachment in axially parallel notches or grooves of the engine drive shaft.
Bei einer solchen Konstruktion übernimmt die Buchse sowohl die Aufgabe der Kräfteübertragung als auch die Bestimmung der exakten Lage des Laufrades bzw. die Abstände der Laufräder zueinander. Hierbei sind hohe Momente auf das Laufrad übertragbar und es wird ein geringer Materialverbrauch erreicht. Optimal ist diese Konstruktion bei Laufrädern aus Blech einsetzbar, wobei ein geringes Gewicht erreicht wird.In such a construction, the socket takes on both the task of transmitting forces and the determination of the exact position of the impeller or the distances between the wheels to each other. In this case, high torques are transferable to the impeller and it is achieved a low material consumption. Optimal This design is used in running wheels made of sheet metal, with a low weight is achieved.
Ferner wird ein optimales Schwingungsverhalten erzielt bei einem hohen Ausgleich von Toleranzen. Es besteht eine konstruktiv einfache und sichere Befestigung bei wenigen Teilen und es wird eine einfache Montage bei zwei oder mehr Laufrädern in einer Mehrstufenpumpe erreicht.Furthermore, an optimal vibration behavior is achieved with a high balance of tolerances. There is a structurally simple and secure attachment with few parts and it is a simple assembly with two or more wheels achieved in a multi-stage pump.
Eine besonders einfache Konstruktion bei hoher Momentenübertragung wird dann erreicht, wenn die Wülste durch außen in die Buchsenwand eingebrachte Kerben gebildet sind. Ferner ist von Vorteil, wenn die achsparallelen Wülste vor einem aus dem Laufrad hervorragenden Bereich der Buchse gebildet sind. Auch wird vorgeschlagen, dass die Länge der Wülste 10 bis 60 % der Länge der Buchse beträgt.A particularly simple construction with high torque transmission is achieved when the beads are formed by notches introduced externally into the socket wall. Furthermore, it is advantageous if the paraxial beads are formed in front of a protruding from the impeller region of the socket. It is also proposed that the length of the beads is 10 to 60% of the length of the bushing.
Um eine einfache und sichere Befestigung der Buchse in der Laufradöffnung zu erreichen, wird vorgeschlagen, dass an der Buchsenaußenwand ein koaxialer Ringwulst vorsteht. Hierbei kann der Ringwulst in einem mittleren Bereich der Buchse angeordnet sein. Vorzugsweise wird hierbei vorgeschlagen, dass die Buchse in der mittigen Laufradöffnung insbesondere durch Laserschweißen eingeschweißt ist.In order to achieve a simple and secure attachment of the bush in the impeller opening, it is proposed that a coaxial annular bead protrudes on the bush outer wall. Here, the annular bead may be arranged in a central region of the socket. Preferably, in this case, it is proposed that the bushing in the central impeller opening is welded in particular by laser welding.
Besonders vorteilhaft ist die Verwendung eines Laufrades mit einer solchen Buchse in einer mehrstufigen Pumpe mit mehreren Laufrädern, wobei die Buchsen der Laufräder stirnseitig aneinander liegen und die Buchsenlänge den Abstand der Laufräder voneinander bestimmt.Particularly advantageous is the use of an impeller with such a socket in a multi-stage pump with multiple wheels, the bushes of the wheels are frontally adjacent to each other and the bushing length determines the distance of the wheels from each other.
Vorteilhafte Ausgestaltungen der Erfindung sind in den Zeichnungen dargestellt und werden im Folgenden näher beschrieben. Es zeigenAdvantageous embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1 eine perspektivische Ansicht einer ersten Ausführungsform der Buchse,1 is a perspective view of a first embodiment of the socket,
Fig. 2 die Buchse nach Fig. 1 auf den Kopf gestellt, Fig. 3 einen Querschnitt durch die Buchse mit einliegender Welle,2, the socket of FIG. 1 turned upside down, 3 shows a cross section through the bushing with the shaft,
Fig. 4 vier unterschiedliche Ausführungsformen der Buchse in verschiedenen Längen,4 shows four different embodiments of the bushing in different lengths,
Fig. 5 eine Ansicht der Vorderseite des Laufrades mit in dieFig. 5 is a view of the front of the impeller in the
Laufradsaugöffnung hineinreichenden und darüber hinaus vorstehender Buchse mit nach innen ragenden Wülsten,Impeller suction opening extending into and beyond projecting socket with inwardly projecting beads,
Fig. 6 eine Ansicht der Rückseite des Laufrades.Fig. 6 is a view of the back of the impeller.
Ein aus Blech gefertigtes Laufrad einer Kreiselpumpe weist eine mittige koaxiale Öffnung auf, mit der das Laufrad auf der Welle 1 eines nicht dargestellten Elektromotors befestigt wird. Für diese Befestigung ist eine Buchse 2 vorgesehen, die von einem Rohrabschnitt gebildet ist und die in der Öffnung 3 des Laufrades 4 einliegt. Die Buchse 2 wird hierbei so weit in die Laufradöffnung 3 eingeschoben, bis ein von der Buchse 2 außen vorstehender koaxialer Ringwulst 5 am Rand der Öffnung 3 anliegt. Hierdurch ist eine exakte Positionierung der Buchse 2 gegenüber dem Laufrad 4 sichergestellt. Nach Erreichen dieser sicheren Lage wird die Buchse 2 am Laufradöffnungsrand durch Laserschweißen befestigt. Der Ringwulst 5 wird durch Stauchen der Buchsenwand 2 erzeugt.An impeller made of sheet metal of a centrifugal pump has a central coaxial opening, with which the impeller is mounted on the shaft 1 of an electric motor, not shown. For this attachment, a bushing 2 is provided, which is formed by a pipe section and which rests in the opening 3 of the impeller 4. The sleeve 2 is in this case inserted so far into the impeller opening 3 until a protruding from the socket 2 outside coaxial annular bead 5 rests on the edge of the opening 3. As a result, an exact positioning of the sleeve 2 with respect to the impeller 4 is ensured. After reaching this safe location, the sleeve 2 is attached to the impeller opening edge by laser welding. The annular bead 5 is produced by upsetting the bushing wall 2.
In einem von einem Ende der Buchse 2 ausgehenden, vor dem Ringwulst 5 endenden Bereich 2a sind von außen in die Buchsenwand 2 achsparallele Kerben 6 eingedrückt, durch die achsparallele vorstehende Wülste 7 in der Innenwand der Buchse 2 gebildet sind. In dem in der Zeichnung dargestellten Ausführungsbeispiel ragen vier achsparallele Wülste 7 an der Innenseite der Buchse 2 im jeweils gleichen Abstand von 90 Grad vor, wobei die Welle 1 an denselben vier Stellen jeweils eine Kerbe oder Nut 8 besitzt, in denen die Wülste 7 formschlüssig hineinragen, so dass ein sicherer Formschluss zwischen Welle 1 und Buchse 2 mit dem Laufrad 4 gebildet ist.In one of an end of the sleeve 2 outgoing, ending in front of the annular bead 5 region 2a axially parallel notches 6 are pressed from the outside into the socket wall 2, are formed by the axially parallel protruding beads 7 in the inner wall of the socket 2. In the embodiment shown in the drawing, four axially parallel beads 7 protrude at the inner side of the sleeve 2 at the same distance of 90 degrees, wherein the shaft 1 at the same four places each have a notch or groove 8, in which the beads 7 protrude positively , So that a secure fit between shaft 1 and socket 2 is formed with the impeller 4.
Bei Verwendung dieser Befestigungsweise bei einer zwei- oder mehrstufigen Pumpe liegen zwei oder mehr Buchsen 2 auf der Antriebswelle 1 , wobei die Buchsen 2 stirnseitig aneinander stoßend auf der Welle gelagert sind, so dass die Länge L der Buchsen insbesondere die Länge des Bereichs 2a, der zumindest zum Teil aus dem Laufrad hinausragt, die exakte Lage der Laufräder auf der Welle und zueinander bestimmt.When using this mounting method in a two- or multi-stage pump are two or more sockets 2 on the drive shaft 1, wherein the Sockets 2 are abutting each other end-mounted on the shaft, so that the length L of the bushes in particular the length of the region 2a, which protrudes at least partially from the impeller determines the exact position of the wheels on the shaft and each other.
Je nach Bauweise und Funktion der Pumpe und der Laufräder sind die Buchsen 2 unterschiedlich lang ausgeführt, wie dies Fig. 4 zeigt. Depending on the design and function of the pump and the wheels, the sockets 2 are designed differently long, as shown in FIG. 4.

Claims

Ansprüche claims
1. Aus Blech gefertigtes Laufrad (4) einer insbesondere mehrstufigen Kreiselpumpe mit Mitteln zum Befestigen an der Antriebswelle (1) eines Elektromotors, dadurch gekennzeichnet, dass1. made of sheet metal impeller (4) of a particular multi-stage centrifugal pump with means for attachment to the drive shaft (1) of an electric motor, characterized in that
• das Laufrad (4) eine mittige koaxiale Öffnung (3) aufweist, in der eine Buchse (2) koaxial befestigt ist,The impeller (4) has a central coaxial opening (3) in which a bushing (2) is coaxially fixed,
• dass die Buchse (2) zumindest auf einer Laufradseite aus dem Laufrad (4) vorsteht, und• that the bushing (2) protrudes from the impeller (4) at least on one impeller side, and
• dass die Buchse (2) in ihrer Innenwand vorstehende achsparallele Wülste (7) zur Befestigung in achsparallelen Kerben oder Nuten (8) der Motorenantriebswelle (1) aufweist.• that the bush (2) in its inner wall projecting axially parallel beads (7) for attachment in axially parallel notches or grooves (8) of the motor drive shaft (1).
2. Laufrad nach Anspruch 1, dadurch gekennzeichnet, dass die Wülste (7) durch außen in der Buchsenwand eingebrachte Kerben (6) gebildet sind.2. impeller according to claim 1, characterized in that the beads (7) are formed by externally introduced in the socket wall notches (6).
3. Laufrad nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die achsparallelen Wülste (7) von einem aus dem Laufrad hervorragenden Bereich (2a) der Buchse gebildet sind.3. impeller according to claim 1 or 2, characterized in that the axially parallel beads (7) are formed by a projecting out of the impeller region (2 a) of the socket.
4. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeich net, dass die Länge der Wülste (7) 10 bis 60 % der Länge der Buchse (2) beträgt.4. impeller according to one of the preceding claims, characterized in that the length of the beads (7) is 10 to 60% of the length of the sleeve (2).
5. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass an der Buchsenaußenwand ein koaxialer Ringwulst (5) vorsteht. 5. impeller according to one of the preceding claims, characterized in that on the sleeve outer wall, a coaxial annular bead (5) protrudes.
6. Laufrad nach Anspruch 5, dadurch gekennzeichnet, dass der Ringwulst (5) in einem mittleren Bereich der Buchse (2) angeordnet ist.6. impeller according to claim 5, characterized in that the annular bead (5) in a central region of the bushing (2) is arranged.
7. Laufrad nach einem der vorherigen Ansprüche, dadurch gekennzeich net, dass die Buchse (2) in der mittigen Laufradöffnung (3) insbesondere durch Laserschweißen eingeschweißt ist.7. impeller according to one of the preceding claims, characterized in that the bushing (2) in the central impeller opening (3) is welded in particular by laser welding.
8. Verwendung eines Laufrades (4) nach einem der vorherigen Ansprüche in einer mehrstufigen Pumpe mit mehreren Laufrädern, wobei die Buchsen (2) der Laufräder (4) stirnseitig aneinander liegen und die Buchsenlänge den Abstand der Laufräder voneinander bestimmt. 8. Use of an impeller (4) according to one of the preceding claims in a multi-stage pump with a plurality of impellers, wherein the bushes (2) of the wheels (4) face each other and the bushing length determines the distance of the wheels from each other.
EP09701807.1A 2008-01-19 2009-01-19 Fastening of the rotor of a centrifugal pump Active EP2242928B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008005245A DE102008005245A1 (en) 2008-01-19 2008-01-19 Attachment of the impeller of a centrifugal pump
PCT/EP2009/000297 WO2009090099A1 (en) 2008-01-19 2009-01-19 Fastening of the rotor of a centrifugal pump

Publications (2)

Publication Number Publication Date
EP2242928A1 true EP2242928A1 (en) 2010-10-27
EP2242928B1 EP2242928B1 (en) 2018-03-07

Family

ID=40668406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09701807.1A Active EP2242928B1 (en) 2008-01-19 2009-01-19 Fastening of the rotor of a centrifugal pump

Country Status (5)

Country Link
US (1) US8535001B2 (en)
EP (1) EP2242928B1 (en)
CN (1) CN101918718B (en)
DE (1) DE102008005245A1 (en)
WO (1) WO2009090099A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102734179A (en) * 2012-07-11 2012-10-17 四川简阳云海泵业有限公司 Minitype multistage centrifugal pump

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Publication number Priority date Publication date Assignee Title
US3025800A (en) * 1957-06-03 1962-03-20 Duro Co Submersible type pump
US3116696A (en) * 1960-09-20 1964-01-07 Red Jacket Mfg Co Centrifugal pump
US3265001A (en) * 1964-04-24 1966-08-09 Red Jacket Mfg Company Centrifugal pump
US3288074A (en) * 1964-11-02 1966-11-29 Weber Ind Inc Submersible pump
US3477384A (en) * 1968-01-04 1969-11-11 Dempster Ind Inc Submersible multi-stage diffuser type pump
US3612716A (en) * 1970-06-15 1971-10-12 Red Jacket Mfg Co Multistage centrifugal pump
US3837612A (en) 1973-06-01 1974-09-24 Red Jacket Mfg Co Mold apparatus for mixed flow impeller
JPH0633789B2 (en) * 1987-10-09 1994-05-02 株式会社日立製作所 Multistage pump
US5176021A (en) 1989-10-26 1993-01-05 Grundfos International A/S Method and apparatus for making shaped metal parts by forming sheet metal
DE3939156C2 (en) 1989-11-27 1994-01-27 Grundfos International A S Bje Compound impeller for a centrifugal pump
DE19746850A1 (en) 1997-10-23 1999-04-29 Wilo Gmbh Impeller made of sheet metal
DE19804907C1 (en) 1998-02-07 1999-07-15 Brinkmann Pumpen K H Brinkmann Rotary fluid pump
DE29906811U1 (en) 1999-04-20 2000-08-31 Brinkmann Pumpen K H Brinkmann Multi-stage centrifugal pump
DE102004007739A1 (en) 2004-02-16 2005-08-25 Wilo Ag Cutting tool for centrifugal pump, has convex lateral surface located opposite concave fixed counter surface

Non-Patent Citations (1)

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Title
See references of WO2009090099A1 *

Also Published As

Publication number Publication date
CN101918718B (en) 2013-01-02
CN101918718A (en) 2010-12-15
EP2242928B1 (en) 2018-03-07
WO2009090099A1 (en) 2009-07-23
US8535001B2 (en) 2013-09-17
DE102008005245A1 (en) 2009-07-23
US20110052402A1 (en) 2011-03-03

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