EP2469093A1 - Fluid-Umwälzpumpe und ihre Verwendung - Google Patents

Fluid-Umwälzpumpe und ihre Verwendung Download PDF

Info

Publication number: EP2469093A1
Authority: EP; European Patent Office
Prior art keywords: shaft; cavity; ducts; pump; pump according
Prior art date: 2010-12-24
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

EP10306512A

Other languages

English (en)

French (fr)

Other versions

EP2469093B1 (de

Inventor

Xavier Pottier

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 Salmson France SAS

Original Assignee

Pompes Salmson SAS

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.)

2010-12-24

Filing date

2010-12-24

Publication date

2012-06-27

2010-12-24 Application filed by Pompes Salmson SAS filed Critical Pompes Salmson SAS

2010-12-24 Priority to EP10306512.4A priority Critical patent/EP2469093B1/de

2010-12-24 Priority to PL10306512T priority patent/PL2469093T3/pl

2012-06-27 Publication of EP2469093A1 publication Critical patent/EP2469093A1/de

2017-12-13 Application granted granted Critical

2017-12-13 Publication of EP2469093B1 publication Critical patent/EP2469093B1/de

Status Not-in-force legal-status Critical Current

2030-12-24 Anticipated expiration legal-status Critical

Images

Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
- F04D13/0606—Canned motor pumps
- F04D13/064—Details of the magnetic circuit

Definitions

the present invention relates to a fluid circulation pump and its use.
canned rotor pumps are used in climatic engineering, especially in hot water heating systems, in the looping of domestic hot water distribution circuits, as well as in renewable energy installations (solar, heat pumps, air conditioned, ).
the pump further comprises a fluid circulation wheel driven in rotation by the shaft at the end of the shaft projecting from the cavity, at least one of the ducts opening between the wheel and the cavity and another of the conduits opening on one side of the wheel opposite the cavity.
At least one of the conduits is in communication with the cavity by one or more radial orifices in the shaft, the orifice or openings opening into the cavity and into the conduit.
the pump further comprises a rotor connected to the shaft, the orifices opening into the cavity and into the conduit on either side of the rotor.
the ducts each extend rectilinearly or helically along the shaft.
the ducts are on either side of the axis of rotation of the shaft.
the shaft comprises several concentric tubes, at least one of the ducts being formed between the tubes.
the wheel is attached to an inner tube.
an inner tube is set back from an outer tube.
an inner tube further comprises a circumferential groove.
the pump further comprises a ring at least partially closing the inlet of the cavity.
the ring is at a narrowing of the diameter of the shaft.
the ring at least partially closes the inlet of at least one of the ducts.
the pump includes a magnet rotor in a stainless steel encapsulation attached to the shaft.
the shaft is stainless steel or ceramic, the encapsulation being welded to the stainless steel shaft or being welded to a fixed casing, preferably crimped, on the ceramic shaft or stainless steel.
the pump further comprises a filter placed at the inlet of the fluid intake duct in the shaft.
a circulating pump of a flooded rotor fluid comprising a cavity and a shaft movable in rotation about its longitudinal axis in the cavity.
the pump further comprises fluid circulation ducts in the shaft which are in communication with the cavity, the ducts extending along the shaft.
the pump thus has a fluid circulation path in the cavity through the shaft. This makes it possible to create a circulation of fluid that allows degassing of the cavity while limiting the introduction of particles directly into the cavity.
the Figures 1 to 4 show a pump 10 of fluid circulation.
This is for example a pump used in a hot water heating system, in the looping of domestic hot water distribution circuits, as well as in renewable energy installations (solar, heat pumps, air conditioning, etc.).
the fluid flows in the direction of the arrows 12 and 14.
the pump comprises a motor 16 comprising a carcass 18 and a cartridge 20.
the motor comprises a stator 24 located outside the cartridge 20 and rotating a rotor 26 located in the cartridge 20.
the cartridge 20 delimits a cavity 22.
the cavity 22 includes a rotor zone around the rotor and the bottom of the cartridge 20.
the rotor 26 is fixed on a shaft 28 rotatable about its longitudinal axis 30.
the shaft 28 is rotated in the cavity 22.
the shaft has an end 32 at the bottom of the cavity 22 and an end 34 projecting from the cavity 22.
the pump 10 further comprises a fluid circulation wheel 36 which is rotated by the shaft 28.
the wheel 36 is carried by the end 34 of the shaft 28.
the end 34 of the shaft 28 may be in the form of an insert carrying the wheel 36 and having a diameter smaller than the rest of the tree 28. The word it is embedded in the sense that the fluid circulated by the pump is also present in the cartridge 22.
the cartridge 22 is sealed.
the pump 10 further comprises conduits 38-41 for circulating the fluid in the shaft 28 which are in communication with the cavity 22, the conduits 38-41 extending along the shaft 28.
the conduits 38-41 allow circulation of the fluid in the cavity for filling with the fluid.
the pump is activated and the ducts allow degassing of the cavity.
the ducts 38-41 allow the evacuation of the residual air pockets present in the cavity.
FIGS. 18-20 show a detail of Figures 1 to 4 .
a conduit 38 opens out between the wheel 36 and the cavity 22, in a space 42 situated between a rear face of the wheel 36 and the opening of the cartridge 20. This conduit 38 allows the entry of fluid into the shaft 28.
Another conduit 39 opens on one side of the wheel 36 at the opposite of the cavity 22.
the conduit 39 opens on the front face of the wheel 36. On this front face comes the fluid according to the arrow 12 which is circulated by centrifugation by the wheel 36 according to the arrow 14 of the Figures 1-4 . This allows the fluid present in the shaft 28 to be set in motion by the suction pressure present on the front face of the wheel 36.
the discharge pressure in the space 42 is higher than the pressure in front of the wheel 36, this allows the flow of fluid towards the wheel 36.
the figure 1 thus shows the circulation of the fluid according to the arrow 70 in the duct 38 and the arrow 72 in the duct 39. This setting promotes the evacuation of air trapped in the cavity.
FIGS. 5 to 17 show examples of conduits as well as examples of the shaft 28. There may be two or more conduits for admission and exit of fluid.
Figures 6 and 7 show examples of two ducts 38 and 39.
the figures 9 , 14 and 17 show examples of three ducts 38, 39, 40.
the figure 10 shows an example of four ducts 38, 39, 40, 41.
the duct 39 is a fluid outlet duct; the other conduits 38, 40, 41 (where appropriate) are fluid intake ducts.
the ducts can each extend rectilinearly as is the case on the Figures 5 to 14 .
the ducts are parallel to the longitudinal axis 30 of the shaft 28. This facilitates the shaping of the ducts and the manufacture of the shaft.
the ducts can also extend helically, as can be seen on the Figures 15 to 17 .
the conduits 38 and 40 have a helical stroke along the shaft.
the entries of the conduits 38 and 40 have an angular position at one end 32 of the shaft and the outputs of the conduits 38 and 40 have an angular position offset at the other end 34 of the shaft.
ducts extending rectilinearly for some and helically for others. According to figure 17 one of the ducts 39 extends straight along the shaft and the other ducts 38 and 40 extend helically.
the ducts 38, 39 may be of circular section transversely to the axis 30 as shown in FIG. figure 7 . This makes it possible to machine the pipes by drilling.
the ducts may be of oval section with the largest dimension which is transverse to the axis 30 as is the case for the ducts 38, 39 of the figure 6 .
the ducts may be of crescent section transversely to the axis 30 as is the case for the ducts 38, 40 on the figure 9 , for the ducts 38, 40, 41 on the figure 10 , for ducts 38, 40 on the figure 17 .
the crescent moon shape or oval facilitates the connection between the radial orifices 52, 54 (described below) and the longitudinal ducts during manufacture, because the drilling of the radial orifices is then more likely to result in the longitudinal ducts.
the Figures 9, 10 and 17 show section ducts of different shapes within the same tree.
the conduits may extend along the axis 30 or be offset radially.
the Figures 9, 10 , 14, 17 show a duct 39 along the axis 30.
the duct 39 of these figures opens at the center of the wheel 36, on the front face of the latter.
the Figures 6 to 17 show other radially offset conduits.
the duct 38 is shifted towards the periphery of the shaft; it is the duct 38 which extends from the zone 42 behind the wheel 36 to a region of the shaft in the cavity 22. This is the duct 38 allowing the entry of the circulation fluid into the tree 28.
the duct 39 is also offset towards the periphery of the shaft; it is the conduit 39 which extends from a region of the shaft in the cavity 22 to the front face of the wheel 36. This is the conduit 39 for the outlet of the circulation fluid in the shaft 28.
the figure 5 corresponds to a side view of the tree of Figures 6 and 7 , where we see the radially offset position of the ducts 38 and 39 and their extension along the shaft 28.
the remarks made on the conduit 38 of the Figures 6 and 7 apply to conduits 38, 40, 41 (where applicable) on Figures 9, 10 , 14 and 17 .
the position of the ducts 38-41 is chosen so that the shaft remains balanced in rotation to avoid vibrations.
the ducts 38, 39 are both radially offset; the volume of the ducts 38, 39 is substantially the same to obtain a good balance.
the duct 39 is along the axis of rotation of the shaft and the other ducts are diametrically opposed or positioned at 120 ° relative to each other.
the conduits 38 to 41 may extend over the entire length of the shaft or not.
the duct 39 extends from the end of the front face of the wheel 36 into a more or less deep region of the shaft in the cavity.
the conduits 38, 40, 41 extend from a region set back from the end 34 of the shaft 28 corresponding to the delivery zone 42 of the pump to a more or less deep region of the shaft in the cavity .
the ducts 38 to 41 extend to the end 32 of the shaft 28.
ducts 38 to 41 extend over a portion of the length of the shaft 28.
the length of the ducts is determined according to the desired speed of degassing. A balance is sought between a large volume of ducts for rapid degassing and shaft resistance. This depends on the context of the use of the pump.
the shaft may be one-piece or consist of several parts.
the shaft 28 is monoblock. It can be ceramic or steel. It can be obtained by molding or by machining.
the tree On the figures 2 , 3 , 4 , 8, 9, 10 , 11, 13 , 14, 17 the tree may consist of several parts, for example two or three parts.
the shaft may consist of several superimposed tubes.
the shaft On the Figures 9, 10 and 14 the shaft consists of an outer tube 44 and an inner tube 46.
the tubes 44 and 46 may be concentric. This makes it possible to use different materials for the tree. For the outside of the shaft, it will be possible to choose a material that is resistant to friction on the bearings (such as treated steel or ceramic).
the outer tube 44 is for example ceramic and obtained by molding.
the shaft 28 is obtained with three parts that are the tubes 44, 46 and 47. This allows to fix the tubes 44 and 46 while choosing a tube 47 for adjusting in length the ducts 38 and 39.
the three parts allow the use of standard tubes 44 and 46 depending on the installation to withstand the bearings and to hold the wheel 36 and use a tube 47 to adjust the volume in the shaft for degassing speed.
the recesses are in the inner tube 46, on its outer surface.
the realization of the ducts 38, 41 is facilitated because machining the outer surface of a tube is easier than the inside.
the ducts are obtained by the inner surface of the inner tube 44 facing the recesses.
the conduits of the figure 14 can also have the helical shape of the figure 17 .
the inner tube is set back from the outer tube; this makes it possible to adjust the length of the longitudinal ducts.
the outer tube is ceramic or steel and it is easy to make the recesses by machining the outer surface of the tube 46 (Steel for example) or by molding the tube 46 (plastic) to obtain the conduits 38,41.
the rotor 26 of the pump 10 may be in the form of a magnet rotor, preferably permanent.
the magnets may be attached to the shaft 28 and be rotated by the stator 24.
the magnet rotor may be in a stainless steel encapsulation attached to the shaft. Encapsulation makes it possible to relate the magnet rotor to a shaft 28 obtained elsewhere. This facilitates the manufacture of the assembly formed by the shaft and the rotor.
the encapsulation is made of stainless steel to resist the presence of the fluid circulated by the pump in the cavity, which can be water. As shown by Figures 12 and 13 , the encapsulation may comprise an outer sheath 48 and two lateral rings 49, 50, on either side of the magnet rotor.
the magnet rotor is protected from the outside environment. In particular, encapsulation tightly protects the magnet.
the shaft (or its outer tube) can be stainless steel or ceramic.
the encapsulation can then be welded to the stainless steel shaft.
Figures 12 and 13 the encapsulation can be welded to an envelope fixed on the ceramic shaft or stainless steel.
the envelope is then crimped onto the shaft.
the circulation ducts are in communication with the cavity so as to allow an exchange of fluids between the ducts and the cavity.
the communication allows the passage of the fluid circulated by the pump, such as water, which is introduced through the conduits 38, 40, 41 to the cavity. This can be achieved during the "filling" of the pump consisting of flooding the rotor in the cavity before the rotation of the pump. This is also done once the pump is rotating.
the communication also allows the passage of fluid, such as air trapped in the cavity, from the cavity into the ducts. This is particularly the case once the pump is rotating.
the communication between the cavity 22 and the shaft can be achieved by one or more ways that can be combined.
the communication between the cavity 22 and the shaft can be made at the end 32 of the shaft 28.
the ducts 38 to 41 can be opening into the cavity 22 at the end 32 of FIG. the shaft 28 located in the cavity bottom 22. This allows to fill the cavity from the rear of the shaft 28.
the conduit 39 may have a narrower section at the end 32 of the shaft so as to limit the flow rate of the fluid entrained by the pump within the cavity 22 to limit the presence of particles in the cavity 22 .
the communication between the cavity and the shaft may also be performed by one or more orifices 52, 54 radial in the shaft 28.
the orifices 52, 54 open into one of the conduits and into the cavity.
the orifices 52, 54 allow the passage of fluid to the cavity 22 (in particular the rotor zone) and to the ducts 38-41.
the orifices 52, 54 allow the degassing of the cavity by centrifugation (in particular the rotor zone).
the shaft 28 may include two orifices 52, 54 as an example. This allows communication between the inside of the shaft and the cavity at different depths in the cavity along the length of the shaft. axis 30.
the orifice or openings may be on either side of the magnet rotor, as can be seen on the Figures 1 to 4 and 12-13 . This makes it possible to better operate the degassing of the cavity because the magnet rotor can constitute an obstacle to the passage of air.
the communication between the shaft and the cavity can be performed for example only by the conduit 54 closest to the end of the shaft located at the bottom of the cavity 22.
the air at Before the rotor 26 can flow through a longitudinal groove on the outer surface of the shaft into the conduit 54.
the duct 38 and the ducts 40, 41, if any, are shifted peripherally so as to facilitate access to the discharge zone 42.
the duct 38 in which the orifice (s) 52 open out, 54 is also shifted towards the periphery of the shaft because the distance to be pierced for the orifice (s) 52, 54 is thus shortened.
the embodiment of the duct 38 on the outer surface of the tube 46 facilitates the angular adjustment of the two tubes 44, 46 so that the orifices 52, 54 open into the duct 38 (which also facilitates the machining of the orifices 52 , 54).
the Figures 18-20 show the presence of a ring 56 closing at least partially the entrance of the cavity.
the ring 56 is facing the discharge zone 42.
the ring 56 is between the shaft 28 and a flange 58 of the cartridge 20.
the ring 56 is for example concentric with respect to the shaft 28, but is immobile in rotation with respect to the cartridge 20 or the flange 58 where appropriate.
a finger 62 of the ring 56 enters a recess of the cartridge 20 or the flange 58 if necessary to prevent the rotation of the ring 56.
the ring 56 is slidably mounted on the shaft 28.
the ring 56 is said to be "floating Because it follows any radial movement of the shaft due to a centering defect of the shaft 28 relative to its axis of rotation.
the ring 56 is concentric with respect to the shaft 28 at the entrance of the cavity
the ring 56 is for example at a narrowing of the diameter of the shaft 28. This makes it possible to avoid possible deposits in front of the pad 60.
the ring 56 may further close at least partially the inlet of one of the ducts.
the at least partial closure of the ducts allows ducts of large section to be easier to achieve while adjusting the duct inlet with the ring.
the at least partial closure of the cavity and / or ducts makes it possible to avoid degradation of hydraulic performance.
the ring 56 has a toric shape so as to be carried by the shaft. Also, in section, the ring 56 may have a stepped shape to present a portion being housed between the flange 58 and the pad 60 and a portion facing the entrance of the duct 38.
the figure 21 shows the already described pump 10 further comprising a filter 64 in the delivery zone 42.
figure 22 shows the filter 64 in detail.
the filter 64 is placed in front of the inlet of the conduit 38 for circulating fluid in the shaft.
the filter limits the flow rate to ensure the filling and degassing.
the clogging of the filter 64 by fouling becomes favorable (for the hydraulic efficiency of the pump), because the filling-outgassing function has already been filled when the pump is switched on. .
It is not necessary to renew the fluid flooding the engine nor to circulate it; the closing of the ducts thus makes it possible to prevent or minimize the flow rate of circulation in the cavity and thus reduce the flow of particles that may damage the components of the pump.
the figure 22 shows a circumferential groove 66 in the shaft 28 (which is in several parts).
the groove 66 facilitates communication between the shaft and the cavity.
the groove 66 makes it possible to circulate the fluid even if the inner tube 44 is angularly offset relative to the outer tube 46 and the orifice or openings 52, 54 are not facing the ducts 38, 40, as shown on the figure 23 .
the presence of the groove 66 facilitates the manufacture of the shaft, because it is not necessary to be concerned about the relative angular position of the tubes 44, 46. To facilitate the realization of the groove, it is on the surface outer tube 46 inside.
Figures 23-25 The description of Figures 5-17 previous ones apply to Figures 23-25 .
the Figures 23 and 24 further show that the shaft 28 may have one or more orifices 52, 54 at a position along its axis 30.
Figure 26 further shows a thick outer tube 44 to increase its strength.
the ducts 38, 40 have a large section, to accelerate the degassing, but the performance of the pump is not degraded due to the presence of the filter 64 or the ring 56 closing the ducts.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Structures Of Non-Positive Displacement Pumps (AREA)

EP10306512.4A 2010-12-24 2010-12-24 Fluid-Umwälzpumpe und ihre Verwendung Not-in-force EP2469093B1 (de)

Priority Applications (2)

Application Number	Priority Date	Filing Date	Title
EP10306512.4A EP2469093B1 (de)	2010-12-24	2010-12-24	Fluid-Umwälzpumpe und ihre Verwendung
PL10306512T PL2469093T3 (pl)	2010-12-24	2010-12-24	Pompa cyrkulacyjna płynu i jej zastosowanie

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP10306512.4A EP2469093B1 (de)	2010-12-24	2010-12-24	Fluid-Umwälzpumpe und ihre Verwendung

Publications (2)

Publication Number	Publication Date
EP2469093A1 true EP2469093A1 (de)	2012-06-27
EP2469093B1 EP2469093B1 (de)	2017-12-13

Family

ID=43969352

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP10306512.4A Not-in-force EP2469093B1 (de)	2010-12-24	2010-12-24	Fluid-Umwälzpumpe und ihre Verwendung

Country Status (2)

Country	Link
EP (1)	EP2469093B1 (de)
PL (1)	PL2469093T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2015067514A1 (de) *	2013-11-08	2015-05-14	Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg	Elektromotorische wasserpumpe

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FR997390A (fr) *	1949-09-08	1952-01-04		Accélérateur de circulation pour installation de chauffage central
US2809590A (en) *	1954-01-29	1957-10-15	Robert J Brown	Electric motor driven pump
DE1098820B (de) *	1959-09-04	1961-02-02	Lederle Pumpen & Maschf	Durch einen Spaltrohrmotor angetriebene mehrstufige Kreiselpumpe
DE1528700A1 (de) *	1964-09-09	1970-01-08	Crane Co	Pumpen mit Motorantrieb
US4013384A (en) *	1974-07-18	1977-03-22	Iwaki Co., Ltd.	Magnetically driven centrifugal pump and means providing cooling fluid flow
US4047847A (en) *	1975-03-26	1977-09-13	Iwaki Co., Ltd.	Magnetically driven centrifugal pump
DE3105021A1 (de) *	1981-02-12	1982-09-16	Hermetic-Pumpen Gmbh, 7803 Gundelfingen	Spaltrohrmotor-pumpen-aggregat, insbesondere fuer normale foerderdruecke
FR2626940A1 (fr) *	1988-02-09	1989-08-11	Grundfos Int	Groupe motopompe pour installations de chauffage
US5248245A (en) *	1992-11-02	1993-09-28	Ingersoll-Dresser Pump Company	Magnetically coupled centrifugal pump with improved casting and lubrication
DE4315448A1 (de) *	1992-05-19	1993-12-23	Lederle Pumpen & Maschf	Peripheralrad-Pumpe
US20020098089A1 (en) *	2001-01-24	2002-07-25	Sundyne Corporation	Canned pump with ultrasonic bubble detector
EP1775478A2 (de) *	2005-10-13	2007-04-18	TCG Unitech Systemtechnik GmbH	Kühlmittelpumpe

2010
- 2010-12-24 PL PL10306512T patent/PL2469093T3/pl unknown
- 2010-12-24 EP EP10306512.4A patent/EP2469093B1/de not_active Not-in-force

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR997390A (fr) *	1949-09-08	1952-01-04		Accélérateur de circulation pour installation de chauffage central
US2809590A (en) *	1954-01-29	1957-10-15	Robert J Brown	Electric motor driven pump
DE1098820B (de) *	1959-09-04	1961-02-02	Lederle Pumpen & Maschf	Durch einen Spaltrohrmotor angetriebene mehrstufige Kreiselpumpe
DE1528700A1 (de) *	1964-09-09	1970-01-08	Crane Co	Pumpen mit Motorantrieb
US4013384A (en) *	1974-07-18	1977-03-22	Iwaki Co., Ltd.	Magnetically driven centrifugal pump and means providing cooling fluid flow
US4047847A (en) *	1975-03-26	1977-09-13	Iwaki Co., Ltd.	Magnetically driven centrifugal pump
DE3105021A1 (de) *	1981-02-12	1982-09-16	Hermetic-Pumpen Gmbh, 7803 Gundelfingen	Spaltrohrmotor-pumpen-aggregat, insbesondere fuer normale foerderdruecke
FR2626940A1 (fr) *	1988-02-09	1989-08-11	Grundfos Int	Groupe motopompe pour installations de chauffage
DE4315448A1 (de) *	1992-05-19	1993-12-23	Lederle Pumpen & Maschf	Peripheralrad-Pumpe
US5248245A (en) *	1992-11-02	1993-09-28	Ingersoll-Dresser Pump Company	Magnetically coupled centrifugal pump with improved casting and lubrication
US20020098089A1 (en) *	2001-01-24	2002-07-25	Sundyne Corporation	Canned pump with ultrasonic bubble detector
EP1775478A2 (de) *	2005-10-13	2007-04-18	TCG Unitech Systemtechnik GmbH	Kühlmittelpumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2015067514A1 (de) *	2013-11-08	2015-05-14	Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg	Elektromotorische wasserpumpe

Also Published As

Publication number	Publication date
EP2469093B1 (de)	2017-12-13
PL2469093T3 (pl)	2018-05-30

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EP2469093A1 - Fluid-Umwälzpumpe und ihre Verwendung - Google Patents

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