EP1198674A1 - Verfahren und einrichtung zum regeln des drucks in einer von einer kreiselpumpe ausgehenden einspeiseleitung - Google Patents
Verfahren und einrichtung zum regeln des drucks in einer von einer kreiselpumpe ausgehenden einspeiseleitungInfo
- Publication number
- EP1198674A1 EP1198674A1 EP00958150A EP00958150A EP1198674A1 EP 1198674 A1 EP1198674 A1 EP 1198674A1 EP 00958150 A EP00958150 A EP 00958150A EP 00958150 A EP00958150 A EP 00958150A EP 1198674 A1 EP1198674 A1 EP 1198674A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- pressure
- throttle
- feed line
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
Definitions
- the invention relates to a method for regulating the pressure in a feed line starting from a centrifugal pump.
- the invention also relates to a device for regulating the pressure in a feed line, starting from a centrifugal pump, into which a throttle is inserted.
- the centrifugal pump works on its pump characteristic m the operating point defined by the current back pressure in the vessel. This means that the centrifugal pump generates a high delivery rate with low back pressure. This is usually associated with an increase in the pump drive power, which places corresponding demands on the drive unit and on the energy supply of the centrifugal pump. In addition, there is a risk of cavitation on the centrifugal pump itself.
- the medium required with the centrifugal pump can be water or another liquid.
- the first solution is to install a fixed mechanical throttle in the feed line (passive solution). This limits the performance of the centrifugal pump and prevents cavitation.
- the centrifugal pump must constantly perform better even with a high back pressure than with an arrangement without a throttle.
- the second variant provides an electrically driven and controlled control valve in the feed line (active solution).
- the active solution is characterized by the fact that at the usual pressure in the feed line there is no throttling in the feed line and therefore no increased pump output is necessary, whereas if the pressure in the feed line drops, the activated throttle limits the pump output and cavitation prevented.
- the active solution requires an external energy supply combined with sensors and signal processing.
- the invention is based on the object of specifying a method and a device for regulating the pressure m of a feed line emanating from a centrifugal pump, which do not necessitate overdimensioning of the centrifugal pump and the associated drive unit and the energy source and nevertheless manage without a throttling device Operation of an external energy supply and processing of electrical signals are part of it.
- the facility is expected to respond to pressure changes largely without delay.
- the operating point of the centrifugal pump should remain as unchanged as possible on the pump curve, even if there is a pressure drop in the feed line.
- the object of specifying a method is achieved according to the invention in that the pressure is regulated by the medium required by the centrifugal pump without an external energy source and without control signals.
- Completely closing the feed line can be prevented by a supplementary measure. This has the advantage that the medium flow is not completely prevented even if the regulation is incorrect. With a high back pressure, a certain flow of demand is always guaranteed. With a very low back pressure m in the feed line, the demand of the centrifugal pump cannot exceed a maximum value.
- the object of specifying a suitable device is achieved according to the invention in that the throttle can be regulated as a function of the pressure in the feed line by the medium required by the centrifugal pump without an external energy source and without control signals.
- the throttle has a closure part arranged in the feed line and reducing its cross section, e.g. a valve cone or a slide plate, which is mechanically in a part of a control valve with a
- Control piston is connected, which delimits the subspace.
- a control line flows between the Centrifugal pump and the throttle from the feed line.
- a force acts on the control piston on its side facing away from the partial space. This force can be generated by a supplied medium, for example compressed air, but also by a mechanical spring.
- the throttle has a mechanical closing limitation. This has the advantage that a medium flow through the throttle is still possible even with faulty control.
- FIG. 3 shows the device according to the invention and associated characteristic curves
- 4 shows a detail from FIG. 3 the essential components of the device according to the invention.
- FIGS. 1 to 3 each show a centrifugal pump 1 which is driven by a motor M. This is integrated in a feed line 2, which leads from a storage container 3 to a pressure container 4.
- pump characteristics 5, 7, 8 and plant characteristics 12a, b, 13a, b are seen as relations between the pressure P m of the feed line 2, m flow direction behind the centrifugal pump 1, and the volume flow Q through the centrifugal pump 1 shown.
- the operating point of the centrifugal pump 1 is an intersection of pump characteristics 5, 8 and system characteristics 12a, b, 13a, b.
- the known device which is shown in FIG. 1, contains an unchangeable throttle 6, which is integrated in the flow direction behind the centrifugal pump 1 m in the feed line 2. Because of the throttle 6, instead of the pump characteristic 7 (without throttle 6) the pump characteristics 8 running at a lower pressure P are obtained.
- the operating point of the centrifugal pump 1 is the intersection of the system characteristics 12a or 13a and the pump characteristic 8. It gives one Volume flow Ql- ⁇ at high pressure Pl or a larger volume flow Q2 at low pressure P2. Even without throttle 6, an acceptable volume flow (Q value of the intersection of system characteristics 12a and pump characteristic curve 7) would result at high pressure Pl. At low pressure P2, however, a suitable, not too large volume flow Q2 and thus cavitation-free operation of the centrifugal pump 1 can only be achieved if the pump characteristic 8 instead of the pump characteristic 7 is relevant because of the throttle 6.
- the disadvantage of this embodiment lies in the fact that the centrifugal pump 1 must be overdimensioned in accordance with the pump characteristics 7 in order to achieve a suitable volume flow Q1 at high counterpressure Pl and if the throttle 6 is present.
- the throttle 6 is necessary to low back pressure P2 to limit the volume flow Q2 so that there is no risk of cavitation on the centrifugal pump 1.
- a centrifugal pump 1 and an associated motor M with very high power must therefore be kept ready.
- the facilities for energy supply must also be dimensioned accordingly.
- the power of the centrifugal pump 1 is to be dimensioned in accordance with the pump characteristics 7, the pump power effectively available is known in the known only by the pump characteristics 8 running at a lower pressure P.
- FIG. 2 shows another known device with which cavitation m of the centrifugal pump 1 can be avoided.
- an actively controllable throttle 9 is arranged in the feed line 2 in the flow direction behind the circulating pump 1.
- This throttle 9 includes a servomotor 10, which requires external energy, and a pressure sensor 11 with an evaluation unit.
- This known device is complex in terms of equipment. The regulation of the throttle 9 can take place in such a way that the system characteristics 12b run largely unchanged with respect to a characteristic curve without a throttle 9 at a sufficiently high counterpressure Pl which does not fear cavitation.
- the device according to the invention which is shown in FIG. 3, enables the same system characteristics 12b, 13b as the device in FIG. 2.
- the operating point of the centrifugal pump 1 on the pump characteristic 5 is also the same.
- no complex regulation of a throttle 9 is required.
- the performance of the centrifugal pump 1 is designed for the high pressure Pl in the fed line.
- the pump characteristic 5 would result in an increase in the volume flow Q in the feed line 2 and thus in an increase in the delivery capacity of the centrifugal pump 1 with only a shifted system characteristic 12b, and thus also an increase in the delivery capacity of the centrifugal pump 1. This could lead to cavitation in the centrifugal pump 1, as well as lead to increased power consumption on the drive unit. So that the centrifugal pump 1 generates the same volume flow Q1 / Q2 as at the higher back pressure Pl at a lower back pressure P2, the passively controllable throttle 14 is inserted into the feed line 2. This variable throttle 14 does not need an external energy supply, without a pressure sensor and without an evaluation unit.
- FIG. 4 is a detail from FIG. 3.
- FIG. 4 shows the centrifugal pump 1 and the throttle 14 m of the feed line 2.
- a closure part 15 of the throttle 14 which changes the cross section of the feed line 2 and which is generally a slide is mechanical, for example via a rod, with a control piston 16 m Control valve 17 connected.
- a counterforce on the control piston 16 on its opposite side is m the control valve 17 by a mechanical spring 20th generated.
- the spring 20 is supported on the housing of the control valve 17 and on the control piston 16.
- the throttle 14 cannot completely close incorrectly even at a very low pressure in the feed line 2, which would make feed-in impossible, the throttle 14 is equipped with a mechanical closing limiter 21, which receives the closure part 15 and completely closes the throttle 14 prevents, since between the closing limit 21 and the wall of the throttle 14, a throttle cross-section always remains open, even if it is smaller.
- Another suitable pump can also take the place of the centrifugal pump 1.
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)
- Paper (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19934564 | 1999-07-22 | ||
DE19934564 | 1999-07-22 | ||
PCT/DE2000/002332 WO2001007790A1 (de) | 1999-07-22 | 2000-07-18 | Verfahren und einrichtung zum regeln des drucks in einer von einer kreiselpumpe ausgehenden einspeiseleitung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1198674A1 true EP1198674A1 (de) | 2002-04-24 |
EP1198674B1 EP1198674B1 (de) | 2003-10-08 |
Family
ID=7915793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00958150A Expired - Lifetime EP1198674B1 (de) | 1999-07-22 | 2000-07-18 | Verfahren und einrichtung zum regeln des drucks in einer von einer kreiselpumpe ausgehenden einspeiseleitung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1198674B1 (de) |
AT (1) | ATE251720T1 (de) |
DE (1) | DE50004011D1 (de) |
ES (1) | ES2206295T3 (de) |
WO (1) | WO2001007790A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0809504D0 (en) * | 2008-05-27 | 2008-07-02 | Weir Minerals Europ Ltd | Pump system |
DE202015106097U1 (de) * | 2015-11-11 | 2016-02-01 | Holger Blum | Fördereinrichtung für eine Vakuumdestillationsanlage |
DE102020129027A1 (de) * | 2020-11-04 | 2022-05-05 | KSB SE & Co. KGaA | Abwasserpumpe und Verfahren zum Betreiben einer Abwasserpumpe |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB346968A (en) * | 1930-03-28 | 1931-04-23 | Holden & Brooke Ltd | Improvements relating to the regulation of centrifugal pumps |
DE571942C (de) * | 1930-12-31 | 1933-03-07 | Siemens Schuckertwerke Akt Ges | Regler |
DE879046C (de) * | 1951-09-23 | 1953-06-08 | Bopp & Reuther Gmbh | Druckhalteregler |
JPS5469804A (en) * | 1977-11-16 | 1979-06-05 | Hitachi Ltd | Pump system with automatic flow control valve |
-
2000
- 2000-07-18 EP EP00958150A patent/EP1198674B1/de not_active Expired - Lifetime
- 2000-07-18 ES ES00958150T patent/ES2206295T3/es not_active Expired - Lifetime
- 2000-07-18 DE DE50004011T patent/DE50004011D1/de not_active Expired - Lifetime
- 2000-07-18 AT AT00958150T patent/ATE251720T1/de not_active IP Right Cessation
- 2000-07-18 WO PCT/DE2000/002332 patent/WO2001007790A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0107790A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001007790A1 (de) | 2001-02-01 |
DE50004011D1 (de) | 2003-11-13 |
ATE251720T1 (de) | 2003-10-15 |
EP1198674B1 (de) | 2003-10-08 |
ES2206295T3 (es) | 2004-05-16 |
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