EP0639716A1 - Device for sewage pumping stations - Google Patents

Device for sewage pumping stations Download PDF

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Publication number
EP0639716A1
EP0639716A1 EP94850060A EP94850060A EP0639716A1 EP 0639716 A1 EP0639716 A1 EP 0639716A1 EP 94850060 A EP94850060 A EP 94850060A EP 94850060 A EP94850060 A EP 94850060A EP 0639716 A1 EP0639716 A1 EP 0639716A1
Authority
EP
European Patent Office
Prior art keywords
pump
pumps
shunt lead
valve
flow
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.)
Withdrawn
Application number
EP94850060A
Other languages
German (de)
French (fr)
Inventor
Göran Björkander
Peter Stahl
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.)
Xylem Water Solutions AB
Original Assignee
ITT Flygt AB
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 ITT Flygt AB filed Critical ITT Flygt AB
Publication of EP0639716A1 publication Critical patent/EP0639716A1/en
Withdrawn legal-status Critical Current

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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
    • F04D29/70—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
    • 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
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel

Definitions

  • a Device to diminish the risk for clogging of pumps for sewage water and other liquids containing contaminations A Device to diminish the risk for clogging of pumps for sewage water and other liquids containing contaminations.
  • the invention concerns a device to diminish the risk for clogging of the hydraulic parts in pump stations for sewage water and other heavily polluted liquids.
  • a pump station for sewage water comprises a tank with inlets and outlets, that latter(s) from one or several pumps.
  • the sewage water always contains a lot of pollutions such as sludge and elongated objects such as rags which easily clog pumps and pipes.
  • the hydraulic parts of the pumps are designed with large throughlets and the inlets sometimes being provided with cutting means which cut the elongated objects into pieces.
  • An example is shown in the Swedish Patent No 820 5774-6.
  • Another method which is used to take away elongated objects from the pump inlet is to operate the pump in reverse a short time before each pump start. In this way rags being stuck to the impeller may be flushed away.
  • 1 stands for a pump station with inlet 2 and outlet 3 for sewage water.
  • 4 and 5 stand for submersible pumps with inlet 6 and 7 respectively and pressure pipes 8 and 9 respectively 10 stands for a shunt lead having a valve arrangement 11.
  • 12 and 13 finally stand for non-return valves.
  • the device according to the invention operates in the following way.
  • the valve 11 may, as previously mentioned, be controlled in various ways, manually or automatically, independant of time, amount of flow etc.
  • the invention also includes the use of three or more pump units in the same or adjacent pump stations being provided with shunt leads in the way described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention concerns a device for pump stations comprising two or more pump units (4), (5). The pressure pipes (8), (9) from the pump units are connected via a shunt lead (10) which is kept open during short intervals at pump starts, thus obtaining a backward flow through the pump(s) which not operate at the moment, thereby flashing out pollutions through the inlet(s) of said pump(s).

Description

  • A Device to diminish the risk for clogging of pumps for sewage water and other liquids containing contaminations.
  • The invention concerns a device to diminish the risk for clogging of the hydraulic parts in pump stations for sewage water and other heavily polluted liquids.
  • A pump station for sewage water comprises a tank with inlets and outlets, that latter(s) from one or several pumps. The sewage water always contains a lot of pollutions such as sludge and elongated objects such as rags which easily clog pumps and pipes. In order to diminish this risk the hydraulic parts of the pumps are designed with large throughlets and the inlets sometimes being provided with cutting means which cut the elongated objects into pieces. An example is shown in the Swedish Patent No 820 5774-6.
  • In order to diminish the risk for sludge banks being built up in the pump station it is known practice to arrange special mixers or valves which during certain periods obtain an agitation of the water. An example is shown in the Swedish Patent No 8900597-9.
  • Another method which is used to take away elongated objects from the pump inlet is to operate the pump in reverse a short time before each pump start. In this way rags being stuck to the impeller may be flushed away.
  • According to the invention is obtained a simple and reliable solution to the above mentioned problems by help of a special shunt lead which is stated in the claims.
  • The invention is described more closely below with reference to the enclosed drawing. Here 1 stands for a pump station with inlet 2 and outlet 3 for sewage water. 4 and 5 stand for submersible pumps with inlet 6 and 7 respectively and pressure pipes 8 and 9 respectively 10 stands for a shunt lead having a valve arrangement 11. 12 and 13 finally stand for non-return valves.
  • The device according to the invention operates in the following way.
  • When the water level in the pump station has risen so much that pumping shall begin, one of the pumps 4 starts to transport the water to the outlet 3. During the initial period of the pumping, some seconds, the valve 11 in the shunt lead is open. This means that a part of the pumped water goes through the shunt lead, downwards through the pressure pipe 9, backwards through the pump 5 and out through its inlet 7. The flow is very strong which means that rags etc being stuck within the pump will be flushed out. The flow will rotate the impeller backwards making objects being wound around the impeller to unwind which makes the cleaning easier. After a predetermined time or when a certain amount of water has passed the valve arrangement 11, the latter is closed and the pumping continues in the normal way. Non-return valves 12 and 13 prevent unintentional back - flow.
  • If the incoming water amount is so big that also the other pump 5 needs to be started, this is done in the normal way and no return flow through the other pump 4 takes place. On the other hand, return flow always takes place as soon as one pump starts after both pumps having been stopped. In order to secure cleaning of both pumps the starting order is alternated.
  • The valve 11 may, as previously mentioned, be controlled in various ways, manually or automatically, independant of time, amount of flow etc. The invention also includes the use of three or more pump units in the same or adjacent pump stations being provided with shunt leads in the way described above.

Claims (3)

1 A device to diminish the risk for clogging of the hydraulic parts in pumps arranged in a pump station comprising at least two pump units (4), (5) characterized in that it comprises a shunt lead (10) between the outlet pipes (8), (9) from the two pumps (4), (5), the shunt lead being provided with a valve arrangement (11) which keeps the shunt lead open under a certain period when one of the pump starts and at least one of the other pumps does not operate, thus obtaining that a part of the flow from the operating pump (4) goes backwards through the non-operating pump (5), thereby flushing pollutions in its hydraulic part through its inlet (7).
2 A device according to claim 1, characterized in that the valve (11) is time controlled.
3 A device according to claim 1, characterized in that the valve (11) is controlled by the flow.
EP94850060A 1993-04-27 1994-04-20 Device for sewage pumping stations Withdrawn EP0639716A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9301403A SE501194C2 (en) 1993-04-27 1993-04-27 Device for reducing the risk of clogging of pumps for wastewater and other liquids containing solid pollutants
SE9301403 1993-04-27

Publications (1)

Publication Number Publication Date
EP0639716A1 true EP0639716A1 (en) 1995-02-22

Family

ID=20389720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94850060A Withdrawn EP0639716A1 (en) 1993-04-27 1994-04-20 Device for sewage pumping stations

Country Status (3)

Country Link
EP (1) EP0639716A1 (en)
NO (1) NO941513L (en)
SE (1) SE501194C2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013159242A1 (en) * 2012-04-26 2013-10-31 Abbruzzese Permutt Gino Rocco System and method for cleaning submersible motor pumps covered with suction sleeves and disposed horizontally or vertically
CN108026711A (en) * 2015-07-30 2018-05-11 爱河溪工程商业有限公司 Underwater fluting apparatus and pumping equipment
CN111706527A (en) * 2020-05-08 2020-09-25 湖南都市职业学院 Automatic separation system for shallow geothermal energy underground water and slurry

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1415769A (en) * 1922-02-17 1922-05-09 Beddoes Hubert Pumping system
US2238597A (en) * 1939-08-24 1941-04-15 Chicago Pump Co Pumping apparatus
JPS5746086A (en) * 1980-09-03 1982-03-16 Hitachi Ltd Operation of sewage pump

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1415769A (en) * 1922-02-17 1922-05-09 Beddoes Hubert Pumping system
US2238597A (en) * 1939-08-24 1941-04-15 Chicago Pump Co Pumping apparatus
JPS5746086A (en) * 1980-09-03 1982-03-16 Hitachi Ltd Operation of sewage pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 117 (M - 139)<995> 30 June 1982 (1982-06-30) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013159242A1 (en) * 2012-04-26 2013-10-31 Abbruzzese Permutt Gino Rocco System and method for cleaning submersible motor pumps covered with suction sleeves and disposed horizontally or vertically
US10344762B2 (en) 2012-04-26 2019-07-09 Gino Rocco ABBRUZZESE PERMUTT System and method for cleaning submersible motor pumps covered with suction sleeves and disposed horizontally or vertically
CN108026711A (en) * 2015-07-30 2018-05-11 爱河溪工程商业有限公司 Underwater fluting apparatus and pumping equipment
CN108026711B (en) * 2015-07-30 2021-05-14 皇家Ihc有限公司 Underwater slotting apparatus and pumping apparatus
CN111706527A (en) * 2020-05-08 2020-09-25 湖南都市职业学院 Automatic separation system for shallow geothermal energy underground water and slurry
CN111706527B (en) * 2020-05-08 2021-08-17 湖南都市职业学院 Automatic separation system for shallow geothermal energy underground water and slurry

Also Published As

Publication number Publication date
NO941513L (en) 1994-10-28
SE9301403L (en) 1994-10-28
SE9301403D0 (en) 1993-04-27
SE501194C2 (en) 1994-12-05
NO941513D0 (en) 1994-04-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19970604