EP4240976A1 - Abwasserpumpe und verfahren zum betreiben einer abwasserpumpe - Google Patents
Abwasserpumpe und verfahren zum betreiben einer abwasserpumpeInfo
- Publication number
- EP4240976A1 EP4240976A1 EP21798599.3A EP21798599A EP4240976A1 EP 4240976 A1 EP4240976 A1 EP 4240976A1 EP 21798599 A EP21798599 A EP 21798599A EP 4240976 A1 EP4240976 A1 EP 4240976A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- impeller
- control unit
- cleaning cycle
- shut
- 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.)
- Pending
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
- F04D13/08—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
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
-
- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2250/00—Geometry
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the invention relates to a sewage pump with a housing and an impeller accommodated therein, the housing having an inlet opening and a pressure nozzle, the impeller having at least one blade with a leading edge facing the inlet opening, and the pump having a motor for operating the impeller.
- Generic pumps regularly comprise a housing and an impeller accommodated therein, the housing having an inlet opening arranged axially with respect to the impeller and a pressure nozzle arranged radially with respect to the impeller, and the impeller having spirally running blades with the inlet opening facing the leading edges.
- a well-known problem of such pumps is the tendency to clog due to accumulation of foreign bodies such as fibers or cloths on the leading edges of the blades. Foreign bodies of this type can accumulate there to such an extent that the entire entry into the impeller is blocked and the conveyance stops.
- the object of the invention is to provide a solution with which the clogging tendency of waste water pumps can be further reduced.
- the invention relates to a sewage pump with a housing and an impeller accommodated therein, the housing having an inlet opening and a pressure nozzle, the impeller having at least one blade with a leading edge facing the inlet opening, and the pump having a motor for operating the impeller has.
- a shut-off or throttle device is arranged in or behind the discharge port, which temporarily reduces or blocks the outflow of the medium from the discharge port of the sewage pump.
- the background to the idea behind the solution of the invention is that the accumulation of foreign bodies on the leading edges of the blades is favored by the fact that the stagnation point is located in the region around the blade leading edge at the optimum operating point.
- a foreign object in the form of a piece of cloth or the like that arrives with the flow is not pulled away to the pressure or suction side of the blade, but lies over the leading edge and gets caught there.
- the invention makes use of the fact that when the pump is severely throttled on the pressure side, recirculation of the pumped medium occurs, which can reach into the area in front of the impeller, ie on the suction side of the impeller. Specifically, in such a situation, part of the medium conveyed radially outwards by the impeller into the discharge connection flows back into the suction area. In this operating state, the blade leading edges are partially flown backwards.
- the stagnation point is then no longer at the leading edge of the blade and the foreign bodies are washed off the leading edge of the blade by the flow, which is now partially directed towards the suction side, and get caught in the partial load vortex that is formed, with which they are then conveyed radially outwards in a short time and the pump through the can leave the discharge port.
- the blockage at the impeller inlet is removed and the pump can then be set back to its original operating point by opening the shut-off or throttle device.
- “behind” the pressure connection means a position downstream of the pressure connection.
- An example is an arrangement in a pipeline that connects to the pressure port, which in connection with the present description is then to be regarded as part of the pump.
- the device can be retrofitted accordingly as a separate unit or integrated into the pump or pipe from the start.
- shut-off or throttle device can be designed differently depending on the pump type.
- the shut-off or throttle device can be arranged, for example, in the riser or in the foot bend.
- the blocking or throttling device can in principle also be located at a certain distance from the impeller on the pump, as long as the distance is small enough to still ensure the functional relationship described above.
- a particular example is positioning in an easily accessible, i.e. not submerged, position on the line of a submersible pump.
- the impeller has at least one blade that has a leading edge. It is non-rotatably connected to a shaft driven by a motor, typically an electric motor. Normally, the impeller has a hub lying in the axis of rotation for this purpose.
- the inlet opening is arranged axially with respect to the impeller and/or the pressure port is arranged radially with respect to the impeller.
- the blades of the impeller run spirally outwards in the radial plane, starting from its axis of rotation or a hub thereof. In the case of multiple blades, this preferably applies to all blades.
- the impeller has, at least on its side opposite the inlet opening, a cover disk which runs in the radial plane and on which the edge of the blade opposite the leading edge rests.
- the blade or impeller can also be partially covered by a cover disk running in the radial plane, with only the area around the inlet opening remaining free.
- a blockage protection in the sense of the present invention can be particularly valuable in such embodiments, since in the case of impellers closed in this way, the foreign bodies cannot be conveyed radially outwards between the blade and the housing because of the cover plate and the pumps are therefore particularly prone to blockage.
- a check valve can also be arranged in or behind the discharge port of the pump.
- the blocking or throttling device can also be a check valve whose closed position can be blocked.
- the shut-off or throttling device in the pressure line is combined with a check valve.
- the blocking or throttling device is preferably a flow-controllable valve. Suitable examples include pinch valves, proportional valves or servo valves.
- the control unit may, but not necessarily, be located on the pump housing. It there is also the possibility of remote control or arrangement of the control unit at a distance from the pump housing. However, such control units arranged at a distance from the pump housing are also to be attributed to the pump within the meaning of the present patent specification.
- the control unit may be configured to perform a cleaning cycle at predetermined intervals or in response to user input.
- the device can be completely self-sufficient or designed to be controlled from the outside.
- the pump can have at least one sensor for measuring an operating state of the pump, which has a signal connection to the control unit.
- the control unit can be designed to be able to use the sensor signal to detect an at least partial blockage of the pump and to carry out a cleaning cycle in response to the detection of such a condition.
- Suitable sensors include, for example, sensors for measuring the power consumption of the pump, speed sensors, suction-side or pressure-side absolute pressure sensors or differential pressure sensors, suction-side or pressure-side sensors for measuring the mass or volume flow, or the like.
- the aim is to be able to use sensors to detect a blockage in the pump.
- the blocking or throttling device can also be activated on the basis of a very simple detection mechanism, for example when there is a certain change in the power consumption of the motor. Such a triggering on suspicion does no harm even if the triggering was actually not actually necessary.
- control unit can also have a signal connection to the motor of the pump and be designed to also change the operating state of the impeller when a cleaning cycle is carried out.
- the cleaning cycles of the pump can thus also be combined by changing the operating state of the impeller, for example with an increase in speed, a reduction in speed or a reversal of the direction of rotation.
- routines for possible cleaning cycles can be stored on the control unit in order to be able to select an optimal routine depending on the operating situation. In one embodiment, this can also be determined automatically by the control unit with the aid of the sensors. For example, such routines can provide for repeated activation and deactivation of the shut-off or throttle device, faster closing and slower opening, faster opening and slower closing, or the like.
- the object of the invention is also achieved by a method in which, in order to remove deposits on the leading edges of the impeller, the shut-off or throttle device reduces or blocks the outflow of the medium from the pressure port for a limited period of time.
- a control unit with a signal connection to the shut-off or throttle device activates a cleaning cycle.
- the controller performs the cleaning cycle at predetermined intervals or in response to user input.
- At least one sensor with a signal connection to the control unit detects the operating state of the pump, and the control unit uses the sensor signal to detect an at least partial blockage of the pump and carries out a cleaning cycle in response to the detection of such a state.
- control unit actuates the pinch valve and changes the operating state of the pump at the same time as part of a cleaning cycle, for example by changing the speed.
- FIG. 1 a sectional drawing of a sewage pump in general
- FIG. 2 shows a schematic circuit diagram of a variant of a waste water pump according to the invention.
- FIG. 3 an illustration of a sewage pump designed as a submersible pump in a modification according to the invention.
- FIG. 1 shows a typical construction of a sewage pump 100.
- This comprises a housing 10 made of metal, for example, consisting of a spiral housing 10a and a housing cover 10b, in which an impeller 15 is accommodated.
- the housing 10 comprises an inlet opening 11 arranged axially with respect to the impeller 15 and a pressure nozzle 12 arranged radially with respect to the impeller 15.
- a motor 13 is also arranged on the housing 10, from which an axial shaft 14 rotatable about an axis of rotation A extends , With which the impeller 15 is non-rotatably connected by means of its hub 16 .
- the impeller 15 itself comprises at least one blade 17 with a leading edge 18, the blade extending spirally outwards in a radial plane, starting from the hub 16.
- the leading edge 18 of the blade 17 is located on its side facing the inlet opening 11 .
- the impeller has a radial support disk 19 on the opposite side of the at least one blade 17 . As indicated in the figure, the impeller 15 is moved counterclockwise during operation in order to pump water from the inlet opening 11 to the discharge port 12 .
- FIG. 2 shows a schematic circuit diagram of a variant according to the invention of such a sewage pump 100, in particular in the form of a centrifugal pump. It's in provided to arrange a shut-off or throttle device 200 on the pressure side of the pump 100. To remove deposits on the leading edge 18 of the impeller 15, the shut-off or throttle device 200 reduces or blocks the outflow of the medium from the pressure connection 12 for a limited period of time.
- FIG. 3 shows a sewage pump 100 designed as a submersible pump in a modification according to the invention.
- the pump 100 is constructed essentially as is explained schematically in connection with FIG.
- a foot bend 20 is formed on the pressure connection 12 and is followed by a throttle fitting, here in the form of a pinch valve 200, for example.
- the pinch valve 200 usually has a membrane 201 and is connected to a mechanism for controlling or moving the membrane 201, which is symbolized as a pressure line 202 in the figure.
- a riser line 300 connects to the pinch valve 200 .
- a control unit 400 of the pump shown schematically in the figure is in signal communication with the pump 100, specifically the pump motor 13 and any sensors, but not shown, and the mechanism for controlling the pinch valve 200.
- control unit 400 is designed to activate the pinch valve to carry out a cleaning cycle of the pump 100 .
- the pinch valve 200 is thereby narrowed, as a result of which a back pressure builds up in the pressure connection 12 or in the foot bend 20, which finally leads to a recirculation of the conveyed medium, which can reach into the area in front of the impeller 15.
- the constriction of the pinch valve 200 can reduce or completely shut off the outflow of the medium from the pressure port 12 . In this operating state, the blade leading edge or blade leading edges in the case of a plurality of blades 17 are partially flown backwards.
- the control unit 400 can be designed to carry out a cleaning cycle as described at predetermined intervals or in response to a user input.
- the pump 100 can have sensors for measuring an operating state and the control unit 400 can be designed to detect an at least partial blockage of the pump 100 using one sensor signal or multiple sensor signals and to carry out a cleaning cycle in response.
- sensors not shown in the figures can be provided on the pump itself, in the pipeline or on the throttle element.
- sensors there could be a vibration sensor on the pump.
- the pressure of the medium could also be measured at other positions.
- routines for possible cleaning cycles can be stored on the control unit 400 in order to be able to select an optimal routine depending on the operating situation. Examples include repeatedly closing and opening pinch valve 200.
- the control unit 400 can also be designed not only to actuate the pinch valve 200 as part of a cleaning cycle, but also to change the operating state of the pump 100 at the same time, for example to increase the speed.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020129027.6A DE102020129027A1 (de) | 2020-11-04 | 2020-11-04 | Abwasserpumpe und Verfahren zum Betreiben einer Abwasserpumpe |
| PCT/EP2021/078932 WO2022096259A1 (de) | 2020-11-04 | 2021-10-19 | Abwasserpumpe und verfahren zum betreiben einer abwasserpumpe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4240976A1 true EP4240976A1 (de) | 2023-09-13 |
Family
ID=78402085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21798599.3A Pending EP4240976A1 (de) | 2020-11-04 | 2021-10-19 | Abwasserpumpe und verfahren zum betreiben einer abwasserpumpe |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4240976A1 (de) |
| DE (1) | DE102020129027A1 (de) |
| WO (1) | WO2022096259A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19734590C2 (de) | 1997-08-09 | 2000-09-21 | Theodor Gutzeit | Abwasserhebeanlage |
| DE19754751C1 (de) * | 1997-12-10 | 1999-03-18 | Klein Schanzlin & Becker Ag | Thermostatisch bewegbares Spülventil |
| ATE251720T1 (de) * | 1999-07-22 | 2003-10-15 | Framatome Anf Gmbh | Verfahren und einrichtung zum regeln des drucks in einer von einer kreiselpumpe ausgehenden einspeiseleitung |
| US6241485B1 (en) * | 1999-12-29 | 2001-06-05 | John W. Warwick | Wastewater flow control system |
| DE102005004887A1 (de) | 2005-02-03 | 2006-08-10 | Ballan Ökotechnik GmbH | Anordnung zum Ansaugen und zum Abziehen von Gasen bei der Förderung gashaltiger Flüssigkeiten wie z.B. Gülle mittels Kreiselpumpe |
| JP2019157817A (ja) | 2018-03-16 | 2019-09-19 | 株式会社荏原製作所 | 遠心羽根車の固定ブッシュ及びこれを備える遠心ポンプ |
-
2020
- 2020-11-04 DE DE102020129027.6A patent/DE102020129027A1/de active Pending
-
2021
- 2021-10-19 EP EP21798599.3A patent/EP4240976A1/de active Pending
- 2021-10-19 WO PCT/EP2021/078932 patent/WO2022096259A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020129027A1 (de) | 2022-05-05 |
| WO2022096259A1 (de) | 2022-05-12 |
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