EP0440046B1 - Submerged pump - Google Patents
Submerged pump Download PDFInfo
- Publication number
- EP0440046B1 EP0440046B1 EP91100539A EP91100539A EP0440046B1 EP 0440046 B1 EP0440046 B1 EP 0440046B1 EP 91100539 A EP91100539 A EP 91100539A EP 91100539 A EP91100539 A EP 91100539A EP 0440046 B1 EP0440046 B1 EP 0440046B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- valve
- chamber
- casing
- nozzles
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 5
- 238000007654 immersion Methods 0.000 claims 2
- 239000013049 sediment Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
-
- 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
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
Definitions
- the invention relates to a submersible pump with an electrically driven pump impeller mounted below the motor and a housing that surrounds the motor and the impeller, the suction opening (s) being (s) arranged in the outer wall of the housing at or below the impeller lead a suction chamber, and a controllable valve is arranged in the pump delivery line, through which the pump delivery line can be partially or completely closed at times.
- German utility model application with the same priority, it is proposed to arrange nozzles in the lower area of a submersible pump, from which a part of the pumped medium, in particular water, emerges in order to whirl up the sediments in the pump sump.
- a constant multiple stream of swirl is generated, which in certain cases is not is always sufficient, since it represents only a partial flow of the total amount conveyed.
- the object of the invention is to improve a submersible pump of the type mentioned so that a high degree of turbulence of sediments is generated in the space in which the submersible pump is located in a compact design.
- nozzles branch off from a lowermost chamber, which open on the outside of the pump housing in the lowermost region of the pump housing, and are directed into the pump sump in such a way that the suction chamber lies above the lowermost chamber and below the pump pressure chamber, which is from a passage is crossed, which connects the pump pressure chamber with the chamber from which the nozzles originate.
- the stacking of the pump chamber, suction chamber and the chamber from which the nozzles originate leads to a particularly compact and simple construction.
- valve is arranged within the pump housing. It is also advantageous if the valve is controlled by an electronic control device.
- valve is completely or partially closed for a certain period of time and then opened. In this way, at the beginning of each pump run, it can be ensured that the sediments that have accumulated up to that point are first whirled up, in order to then be safely extracted. Furthermore, it is also advantageous if the valve is closed in the meantime while the pump is running, so that intermittent whirling up of suspended matter can occur as required. It is particularly advantageous here if the frequency and / or duration of the closing of the valve is controlled as a function of the amount of suspended matter in the pump chamber.
- An electric motor 2 with a vertical drive shaft 3 is fastened in a housing 1 of a submersible pump.
- An impeller 4 of a centrifugal pump is attached to the underside of the motor shaft 3.
- the impeller 4 conveys into a pump chamber 5, from which a pressure connection 6 branches upwards, to which the pressure hose can be connected.
- a coaxial suction nozzle 7 which extends into a suction chamber 8 which is located below the pump chamber 5 and all around in the pump housing wall.
- a suction chamber 8 which is located below the pump chamber 5 and all around in the pump housing wall.
- another chamber 10 which is connected via at least one channel or passage 11 to the pump chamber 5 or to the pressure side of the impeller 4, the channel or passage 11 crossing the suction chamber 8, in particular vertically.
- outlet channels or openings or nozzles 12 are introduced, which open to the side of the pump in the lowest area. The nozzles 12 are thus located below the suction openings 9.
- the chambers 5, 8 and 10 are thus arranged in layers one above the other, the pressure chamber 10 being at the bottom.
- nozzles 12 are directed obliquely downwards in order to reach the sediments deposited on the bottom of the pump sump.
- An optimal alignment of the nozzles is created when the vertical plane running through the respective nozzle axis forms an intersection with the horizontal cross-sectional plane of the pump housing 1, which is circular in horizontal cross-section, which is a tangent or a secant to the pump housing wall that does not run through the center of the circle.
- the pump housing area forming the chambers 8 and 10 can, as shown in the exemplary embodiment, be unscrewed from the rest of the pump housing in order to achieve separate manufacture, that is to say subsequent attachment.
- the valve 13 can be completely or partially closed during the pump run in order to allow more or less delivery medium to escape through the nozzles 12. If the pump is only run temporarily, especially at regular intervals, e.g. Whenever the pump chamber is filled up to a certain height, it is advantageous if the valve 13 is closed more or completely at the beginning of the pump run in order to remove the sediments that have been lowered during the standstill of the pump whirl up and thus vacuum safely. In this case, the amount of sediment deposited and / or the proportion of sediment in the medium can be measured by conventional devices using conventional devices and the valve 13 can be controlled accordingly.
- valve In the case of continuously operating submersible pumps as well as during the operation of periodically operating submersible pumps, the valve can in the meantime be completely or partially closed in order to temporarily increase the turbulence effect as required. Finally, the valve 13 can also be completely or partially closed in regular short sections in order to allow the medium to emerge from the nozzles in a pulsating manner. These in particular oscillating movements of the valve actuator can be controlled particularly precisely by an electronic device.
- the valve 13 is shown in the exemplary embodiment as a flap valve. Alternatively, other types of valves or shut-off devices can also be arranged. Solenoid valves are particularly advantageous.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
Description
Die Erfindung betrifft eine Tauchpumpe mit einem elektrisch angetriebenen, unterhalb des Motors gelagerten Pumpenlaufrad und einem Gehäuse, das den Motor und das Laufrad umgibt, wobei in der Gehäuseaußenwand in Höhe oder unterhalb des Laufrades die Ansaugöffnung(en) angeordnet ist (sind), die in eine Ansaugkammer führen, und in der Pumpenförderleitung ein steuerbares Ventil angeordnet ist, durch das die Pumpenförderleitung zeitweise ganz oder teilweise schließbar ist.The invention relates to a submersible pump with an electrically driven pump impeller mounted below the motor and a housing that surrounds the motor and the impeller, the suction opening (s) being (s) arranged in the outer wall of the housing at or below the impeller lead a suction chamber, and a controllable valve is arranged in the pump delivery line, through which the pump delivery line can be partially or completely closed at times.
In der nicht vorveröffentlichten deutschen Gebrauchsmusteranmeldung mit gleichem Zeitrang wird vorgeschlagen, im unteren Bereich einer Tauchpumpe Düsen anzuordnen, aus denen ein Teil des gepumpten Mediums, insbesondere Wasser austritt, um die Sinkstoffe im Pumpensumpf aufzuwirbeln. Es wird ein ständiger mehrfacher Strom zum Verwirbeln erzeugt, der in bestimmten Fällen nicht immer ausreicht, da er nur ein Teilstrom der gesamten geförderten Menge darstellt.In the not previously published German utility model application with the same priority, it is proposed to arrange nozzles in the lower area of a submersible pump, from which a part of the pumped medium, in particular water, emerges in order to whirl up the sediments in the pump sump. A constant multiple stream of swirl is generated, which in certain cases is not is always sufficient, since it represents only a partial flow of the total amount conveyed.
Aus der DE-C-805 007 ist es bekannt, den Pumpenauslaß einer Tauchpumpe zu verschließen, um durch einen unteren Auslaß Wasser in die abgenutzten Stoffe zu leiten und sie hierdurch aufzuwirbeln. Die gewählte Bauweise nebeneinander angeordneter Kammern führt zu einer erheblichen Breite des Pumpengehäuses.From DE-C-805 007 it is known to close the pump outlet of a submersible pump in order to guide water into the worn substances through a lower outlet and thereby to stir them up. The selected design of chambers arranged side by side leads to a considerable width of the pump housing.
Aufgabe der Erfindung ist es, eine Tauchpumpe der eingangs genannten Art so zu verbessern, daß bei kompakter Bauweise ein hoher Grad der Verwirbelung von Sinkstoffen in dem Raum erzeugt wird, in dem die Tauchpumpe steht.The object of the invention is to improve a submersible pump of the type mentioned so that a high degree of turbulence of sediments is generated in the space in which the submersible pump is located in a compact design.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß von einer untersten Kammer Düsen abzweigen, die außen am Pumpengehäuse im untersten Bereich des Pumpengehäuses münden, und in den Pumpensumpf gerichtet sind, daß über der untersten Kammer und unterhalb der Pumpendruckkammer die Ansaugkammer liegt, die von einem Durchlaß durchquert ist, der die Pumpendruckkammer mit der Kammer verbindet, von der die Düsen ausgehen.This object is achieved in that nozzles branch off from a lowermost chamber, which open on the outside of the pump housing in the lowermost region of the pump housing, and are directed into the pump sump in such a way that the suction chamber lies above the lowermost chamber and below the pump pressure chamber, which is from a passage is crossed, which connects the pump pressure chamber with the chamber from which the nozzles originate.
Das Übereinanderordnen von Pumpenkammer, Ansaugkammer und der Kammer, von der die Düsen ausgehen, führt zu einer besonders kompakten und einfachen Bauweise.The stacking of the pump chamber, suction chamber and the chamber from which the nozzles originate leads to a particularly compact and simple construction.
Durch das Schließen des Ventils und die an der untersten Stelle liegenden Düsen, wird zeitweise ein großer Teil oder die gesamte Pumpenfördermenge zum Verwirbeln und/oder Auflösen von Sinkstoffen und Sinkstoffansammlungen benutzt, so daß in jedem Fall die aus den Düsen austretenden Flüssigkeitsströme ausreichen, um alle Sinkstoffe abzupumpen. Es kommt damit weder zu Überbelastungen der Pumpe noch zu Schlammablagerungen. Dies erfolgt auch bei extrem starken Anteil an Sinkstoffen als auch bei Sinkstoffen hohen Gewichts und/oder hohen Anteils.By closing the valve and the nozzles at the lowest point, a large part or all of the pump delivery rate is temporarily used to swirl and / or dissolve sediments and sediment accumulations, so that in any case the liquid flows emerging from the nozzles are sufficient to cover all of them Pump out sediments. So there is no overloading of the Pump still to build up sludge. This also takes place with an extremely high proportion of suspended matter as well as with heavy weight and / or high content.
Eine kompakte und wenig störanfällige Bauweise wird dann erreicht, wenn das Ventil innerhalb des Pumpengehäuses angeordnet ist. Auch ist es von Vorteil, wenn das Ventil durch eine elektronische Steuereinrichtung gesteuert wird.A compact and less prone to failure design is achieved if the valve is arranged within the pump housing. It is also advantageous if the valve is controlled by an electronic control device.
Vorzugsweise wird vorgeschlagen, daß zu Beginn des Pumpenlaufs das Ventil für eine bestimmte Zeitspanne ganz oder teilweise geschlossen ist und danach geöffnet wird. Hiedurch kann zu Beginn jeden Pumpenlaufs dafür gesorgt werden, daß erst einmal die Sinkstoffe, die sich bis dahin abgelagert haben, aufgewirbelt werden, um dann mit Sicherheit abgesaugt zu werden. Ferner ist es aber auch von Vorteil, wenn das Ventil während des Pumpenlaufs zwischenzeitlich geschlossen wird, so daß es zu zwischenzeitlichen Aufwirbelungen von Sinkstoffen je nach Bedarf kommen kann. Besonders vorteilhaft ist es hierbei wenn, die Häufigkeit und/oder Dauer des Schließens des Ventils abhängig von der Menge der Sinkstoffe im Pumpenraum gesteuert wird.It is preferably proposed that at the beginning of the pump run the valve is completely or partially closed for a certain period of time and then opened. In this way, at the beginning of each pump run, it can be ensured that the sediments that have accumulated up to that point are first whirled up, in order to then be safely extracted. Furthermore, it is also advantageous if the valve is closed in the meantime while the pump is running, so that intermittent whirling up of suspended matter can occur as required. It is particularly advantageous here if the frequency and / or duration of the closing of the valve is controlled as a function of the amount of suspended matter in the pump chamber.
Ein Ausführungsbeispiel der erfindungsgemäßen Pumpe ist in der Zeichnung in einem senkrechten axialen Schnitt dargestellt und wird in unterschiedlichen Arbeitsverfahren im folgenden beschrieben.An embodiment of the pump according to the invention is shown in the drawing in a vertical axial section and is described in different working methods in the following.
In einem Gehäuse 1 einer Tauchpumpe ist ein Elektromotor 2 mit senkrechter Antriebswelle 3 befestigt. An der Unterseite der Motorenwelle 3 ist ein Laufrad 4 einer Kreiselpumpe befestigt. Das Laufrad 4 fördert in eine Pumpenkammer 5, von der nach oben ein Druckstutzen 6 abzweigt, an dem Druckschlauch anschließbar ist.An
An der Unterseite des Laufrades 4 im mittleren Bereich befindet sich ein koaxialer Saugstutzen 7, der in eine Ansaugkammer 8 hineinreicht, die sich unterhalb der Pumpenkammer 5 befindet und ringsum in der Pumpengehäusewand. Unterhalb der Ansaugkammer 8 befindet sich eine weitere Kammer 10, die über mindestens einen Kanal oder Durchlaß 11 mit der Pumpenkammer 5 bzw. mit der Druckseite des Laufrades 4 verbunden ist, wobei der Kanal oder Durchlaß 11 die Ansaugkammer 8, insbesondere senkrecht durchquert. In den seitlichen Außenwänden der Kammer 10 sind Auslaßkanäle bzw. Öffnungen oder Düsen 12 eingebracht, die seitlich der Pumpe im untersten Bereich münden. Damit befinden sich die Düsen 12 unterhalb der Ansaugöffnungen 9.On the underside of the impeller 4 in the central area there is a coaxial suction nozzle 7 which extends into a
Im in der Zeichnung dargestellten Ausführungsbeispiel sind damit die Kammern 5, 8 und 10 schichtweise übereinander angeordnet, wobei die Druckkammer 10 zu unterst liegt.In the exemplary embodiment shown in the drawing, the
In diesem Fall ist dafür zu sorgen, daß die Düsen 12 schräg nach unten gerichtet sind, um die auf den Boden des Pumpensumpfes sich ablagernden Sinkstoffe zu erreichen. Eine optimale Ausrichtung der Düsen wird dann geschaffen, wenn die durch die jeweilige Düsenachse verlaufende senkrechte Ebene mit der waagerechten Querschnittsebene des im waagerechten Querschnitt kreisrunden Pumpengehäuses 1 eine Schnittlinie bildet, die eine Tangente oder eine nicht durch den Kreismittelpunkt verlaufende Sekante zur Pumpengehäusewand ist.In this case it must be ensured that the
Der die Kammern 8 und 10 bildende Pumpengehäusebereich kann, wie im Ausführungsbeispiel dargestellt, vom übrigen Pumpengehäuse abschraubbar sein, um eine getrennte Fertigung also auch ein nachträgliches Befestigen zu erreichen.The pump housing area forming the
Das Ventil 13 kann während des Pumpenlaufs ganz oder teilweise geschlossen sein, um mehr oder weniger Fördermedium durch die Düsen 12 austreten zu lassen. Wird die Pumpe nur zeitweilig, insbesondere in regelmäßigen Abständen laufengelassen, z.B. immer dann, wenn der Pumpenraum bis zu einer bestimmten Höhe gefüllt ist, so ist es von Vorteil, wenn zu Beginn des Pumpenlaufs das Ventil 13 stärker oder ganz geschlossen wird, um die Sinkstoffe, die sich während des Stillstandes der Pumpe abgesenkt haben, erst einmal aufzuwirbeln und damit mit Sicherheit abzusaugen. Hierbei kann durch übliche Vorrichtungen die Menge der sich abgelagerten Sinkstoffe und/oder der Anteil der Sinkstoffe im Medium durch übliche Vorrichtungen gemessen und entsprechend das Ventil 13 gesteuert werden.The
Bei ständig arbeitenden Tauchpumpen als auch beim Lauf periodisch arbeitender Tauchpumpen kann zwischenzeitlich das Ventil ganz oder teilweise geschlossen werden, um den Verwirbelungseffekt zeitweilig entsprechend dem Bedarf zu verstärken. Schließlich kann auch das Ventil 13 ganz oder teilweise in regelmäßigen kurzen Abschnitten geschlossen werden, um das Medium aus den Düsen pulsierend austreten zu lassen. Diese insbesondere schwingenden Bewegungen des Ventilstellgliedes können besonders exakt durch eine elektronische Einrichtung gesteuert werden.In the case of continuously operating submersible pumps as well as during the operation of periodically operating submersible pumps, the valve can in the meantime be completely or partially closed in order to temporarily increase the turbulence effect as required. Finally, the
Das Ventil 13 ist im Ausführungsbeispiel als Klappenventil dargestellt. Alternativ können aber auch andere Arten von Ventilen bzw. Absperrorganen angeordnet werden. Besonders vorteilhaft sind Magnetventile.The
Claims (7)
- A submerged pump having an electrically driven pump rotor (4) mounted below the motor and a casing (1) which encloses the motor (2) and the rotor (4), while disposed in the casing outer wall (1) at the height of or below the rotor is or are intake opening(s) (9) which extend into an intake chamber, and disposed in the pump delivery line (6) is a controllable valve (13) via which the pump delivery line can be periodically completely or partially closed, characterized in that- branching off from a bottom chamber (10) are nozzles (12) which discharge outside the pump casing (1) in the bottom zone thereof and are directed into the pump sump,- disposed above the bottom chamber (10) and below the pump pressure chamber (5) is the intake chamber (8), through which a passage (11) extends which connects the pump pressure chamber (5) to the chamber (10) from which the nozzles (12) extend.
- An immersion pump according to claim 1, characterized in that the valve (13) is disposed inside the pump casing.
- An immersion pump according to claims 1 or 2, characterized in that the valve (13) is controlled via an electronic control device.
- A method of operating a submerged pump according to one of the preceding claims, characterized in that at the start of pump operation the valve (13) is completely or partially closed for a predetermined period and thereafter opened.
- A method of operating a submerged pump according to claim 4, characterized in that the valve (13) is closed at intervals during pump operation.
- A method according to claims 4 or 5, characterized in that the frequency and/or duration of the closure of the valve (13) is controlled in dependence on the quantity of suspended matter in the pump chamber.
- A method according to one of the preceding claims, characterized in that the valve control member is oscillatably operated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4002498A DE4002498A1 (en) | 1990-01-29 | 1990-01-29 | SUBMERSIBLE PUMP |
| DE4002498 | 1990-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0440046A1 EP0440046A1 (en) | 1991-08-07 |
| EP0440046B1 true EP0440046B1 (en) | 1994-04-06 |
Family
ID=6398965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91100539A Expired - Lifetime EP0440046B1 (en) | 1990-01-29 | 1991-01-18 | Submerged pump |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0440046B1 (en) |
| AT (1) | ATE104021T1 (en) |
| DE (2) | DE4002498A1 (en) |
| DK (1) | DK0440046T3 (en) |
| ES (1) | ES2051034T3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2799513B1 (en) * | 1999-10-12 | 2002-01-18 | Pompes Salmson Sa | SELF-CLEANING DOMESTIC PUMP |
| WO2015135020A1 (en) * | 2014-03-11 | 2015-09-17 | Pumpeng Pty Ltd | Submersible pump and method of pumping fluid |
| CN107143504A (en) * | 2017-07-07 | 2017-09-08 | 三联泵业股份有限公司 | A kind of submersible pump cooling system |
| CN112922841B (en) * | 2021-02-05 | 2022-01-25 | 合肥恒大江海泵业股份有限公司 | Submersible electric pump with self-adaptive submersible depth adjusting mechanism |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE804065C (en) * | 1948-10-02 | 1951-04-16 | Klein Schanzlin & Becker Akt G | Flushing and stirring device on centrifugal pumps for liquid manure or the like. |
| DE849957C (en) * | 1949-01-25 | 1952-09-18 | Ostfriesische Maschinen Und Ge | Vertical centrifugal pump with stirring device and pump flushing for conveying thick matter, manure and like |
| DE832550C (en) * | 1949-06-03 | 1952-02-25 | Allgaier Werkzeugbau G M B H | Manure pump with motor drive |
| DE805007C (en) * | 1950-01-31 | 1951-05-04 | Rudolf Flender | Centrifugal pump for stirring and pumping liquid manure and other muddy liquids |
| US2890659A (en) * | 1955-05-27 | 1959-06-16 | Haentjens Otto | Slurry pump |
| DE2258234C3 (en) * | 1972-11-28 | 1980-06-04 | Hans 8221 Taching Beham | Centrifugal pump for liquid manure or manure containers |
| SE416107B (en) * | 1977-03-31 | 1980-12-01 | Sanbergs Industrikonstruktione | REGULATORY SET OF AN ESTABLISHMENT WITH A LARGE SUCTION DEVICE FOR SUCCESSING SUSPENSIBLE MATERIALS AND DEVICE FOR IMPLEMENTATION OF THE SET |
| DE7739103U1 (en) * | 1977-12-22 | 1978-04-06 | Fa. Carl Zeiss, 7920 Heidenheim | SUBMERGED PUMP FOR PUMPING A LIQUID IN WHICH SOLID PARTICLES ARE SUSPENDED |
-
1990
- 1990-01-29 DE DE4002498A patent/DE4002498A1/en not_active Withdrawn
-
1991
- 1991-01-18 DK DK91100539.5T patent/DK0440046T3/en active
- 1991-01-18 DE DE91100539T patent/DE59101298D1/en not_active Expired - Lifetime
- 1991-01-18 EP EP91100539A patent/EP0440046B1/en not_active Expired - Lifetime
- 1991-01-18 ES ES91100539T patent/ES2051034T3/en not_active Expired - Lifetime
- 1991-01-18 AT AT91100539T patent/ATE104021T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE104021T1 (en) | 1994-04-15 |
| DE59101298D1 (en) | 1994-05-11 |
| DE4002498A1 (en) | 1991-08-08 |
| DK0440046T3 (en) | 1994-08-08 |
| ES2051034T3 (en) | 1994-06-01 |
| EP0440046A1 (en) | 1991-08-07 |
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Legal Events
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Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
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| 17P | Request for examination filed |
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