EP1945867A1 - Wastewater lifting pump with improved features - Google Patents
Wastewater lifting pump with improved featuresInfo
- Publication number
- EP1945867A1 EP1945867A1 EP06744406A EP06744406A EP1945867A1 EP 1945867 A1 EP1945867 A1 EP 1945867A1 EP 06744406 A EP06744406 A EP 06744406A EP 06744406 A EP06744406 A EP 06744406A EP 1945867 A1 EP1945867 A1 EP 1945867A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blow
- unit
- sump
- wastewater
- space
- 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- Withdrawn
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
- F04D13/16—Pumping installations or systems with storage reservoirs
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/007—Preventing loss of prime, siphon breakers
Definitions
- the subject of the invention relates to a wastewater lifting pump with improved features, which contains a sump with a reception space, an input part-unit serving to feed the wastewater into the sump and an output part-unit serving to discharge the wastewater from the sump, where the output part-unit has a pump unit located in the reception space of the sump and a transmission duct connected to it also, at least partly, located in the reception space of the sump, the pump unit has a housing with a wall delimiting the medium transmission space and an impeller located in the medium transmission space in such a way so that it may rotate, the wall of the housing has an input opening and output opening connected to the medium transmission space, and the transmission duct is connected to the output opening of the housing.
- wastewater lifting sumps with pump units fitted are being increasingly used for the transmission of industrial, but especially communal wastewater.
- the essence of these is that the wastewater coming from the wastewater emission is transported through a pipe of wide diameter to a small sized temporary storage space.
- the sump contains a lifting pump, which is switched on or off depending on the amount of wastewater entering the sump.
- the pump is switched on, and the wastewater in the sump is discharged from the sump through the transmission duct connected to the pressure side of the pump towards the main sewage system network.
- HU 1.154 Utility model specification
- a phenomenon frequently occurring in the lifting sumps of pressurised wastewater systems is that due to the pressure and velocity conditions prevailing in the street ' collector ducts, the pressure established in the part of the transmission duct outside of the sump sucks the wastewater out of the transmission duct and, through this, from the sump as well. At this time the wastewater disappears for a short time from around the impeller of the pump unit, that is the base of the sump, and it is replaced by air. When, after this, a new amount of wastewater arrives in the sump, while the level is rising the wastewater traps the air in the medium transmission space around the pump impeller, which then forms an air blockage there.
- Our aim with the invention was to overcome this deficiency of the wastewater lifting pumps in use and to create a solution that would stop the dry running of the impeller of the pump unit, and so reduce unnecessary use of energy and, furthermore, increase the lifespan of the pump unit.
- blow-off gaps are created in suitably selected places in the wall of the housing of the pump unit, or even blow-off openings in a practical section of the shell of the transmission duct, which we either leave open or fit with an air bleed valve, then the increasing pressure around the impeller and in the route serving for the transmission of the wastewater will have an effect on the air block and force the trapped air out through the blow-off gaps and blow-off openings, or through the air bleed valves fitted into these, as a consequence of which the air block will be terminated, and again the wastewater to be transported will again be able to flow into the empty medium transmission space, which, after this, the pump unit will again be able to properly transport into the transmission duct, and so the task can be solved.
- the wastewater lifting pump with improved features which contains a sump with a reception space, an input part-unit serving to feed the wastewater into the sump and an output part-unit serving to discharge the wastewater from the sump
- the output part-unit has a pump unit located in the reception space of the sump and a transmission duct connected to it also, at least partly, located in the reception space of the sump
- the pump unit has a housing with a wall delimiting the medium transmission space and an impeller located in the medium transmission space in such a way so that it may rotate
- the wall of the housing has an input opening and output opening connected to the medium transmission space
- the transmission duct is connected to the output opening of the housing
- - is set up in such a way that in the operating condition of the pump unit in the part of the wall of the housing above the base plane of the impeller one or more blow-off gaps are formed linking the medium transmission space with the external environment, practically with the reception space of the sump, and/or in the shell of the transmission duct one or more
- a further feature of the wastewater lifting pump according to the invention may be that at least one of the blow-off gaps in the wall of the pump unit housing is located in the part of the wall above the upper plane of the impeller.
- the blow-off gap located in the housing wall is a bore hole with a diameter of at least 0.5 mm.
- the blow-off gap located in the wall of the housing of the pump unit may have a monotonically increasing cross-section increasing from the medium transmission space of the housing towards the reception space of the sump.
- At least one of the blow-off gaps in the wall of the pump unit housing is a cleft starting from the input opening of the wall of the housing and extending to above the upper plane of the impeller.
- the transmission duct is supplemented with a flow-direction restriction part-unit, and the one or more blow-off openings belonging to the transmission duct are located in the section of the shell of the transmission duct between the output opening of the pump unit and the flow-direction restriction part-unit.
- the flow-direction restriction part-unit is a non-return valve.
- the blow-off opening located in the shell of the transmission duct is a bore hole with a diameter of at least 0.5 mm.
- the blow-off opening located in the shell of the transmission duct may have a monotonically increasing cross-section increasing from the internal space of the transmission duct towards the reception space of the sump.
- an air bleed valve is fitted in at least some of the blow-off gaps and/or blow-off openings.
- the most important advantage of the wastewater lifting pump according to the invention is that due to the uniquely arranged blow-off gaps and blow-off openings the dry running of the pump impeller can be stopped, which reduces the energy consumption of the wastewater lifting pump a great deal and also increases the lifespan of the pump.
- blow-off gaps and blow-off openings according to the invention can be created in the pumps and transmission ducts using simple equipment and a small amount of physical work.
- this not only newly installed wastewater drainage networks can be operated with favourable energy characteristics, but systems built in the past with unfavourable energy usage features can be transformed, which on the overall economic level may result in significant energy savings.
- blow-off gaps and blow-off openings can be made using simple equipment and traditional manufacturing technology step, and so with a minimal increase in cost a significantly more effective method of wastewater transportation can be realised, which, taking into consideration the sum total of investment, operation and maintenance costs, results in significantly lower specific costs than was usual in the case of the traditions solutions.
- figure 1 shows a possible version of the wastewater lifting pump according to the invention in side view, in partial cross-section
- figure 2 shows a favourable realisation of the pump unit of the wastewater lifting pump
- figure 3 shows another version of the pump unit of the wastewater lifting pump
- figure 4 shows a detail of the transmission duct in the vicinity of the blow-off opening in longitudinal cross-section.
- FIG. 1 shows a version of the wastewater lifting pump according to the invention in which the sump 10, according to the usual construction, consists of a circular base 12, a circular top 13 and a mantle 11 in the form of a truncated cone widening downwards.
- the mantle 11, the base 12 and the top 13 enclose the reception area 14, in which the input part-unit 20 and the output part-unit 30 are located.
- the input part-unit 20 includes a feed pipe-end 21 and an inlet pipe 22, of which the inlet pipe 22 creates the connection between the wastewater source and the sump 10.
- Also found in the mantle 11 of the sump 10 there is an outlet opening, through which the extension of the transmission pipe 31 of the output part-unit 30 leaves the reception space 14 of the sump 10.
- the output part-unit 30 also includes the pump unit 32.
- the flow-direction restriction part- unit 40 is fitted into the transmission pipe 31, which is a normally constructed nonreturn valve. The task of the flow-direction restriction part-unit 40 is to prevent the wastewater that has passed through the sump 10 to the transmission pipe from flowing backwards.
- Figure 1 shows well that the pump unit 32 has a housing 33, the wall 34 of which surrounds the medium transmission space 35.
- the impeller 36 is found in this medium transmission space 35, which is fixed to an axle 37.
- the axle 37 - in a way known in itself- is fitted to the housing 33 of the pump unit 32 in a way so that it may rotate, and it is linked to a motor located in the housing 33.
- the wall 34 has an input opening 34a - several in the case of the present version - connecting the reception area 14 of the sump 10 with the medium transmission space 35, and furthermore, has an output opening 34b connecting the medium transmission space 35 with the internal space 31b of the transmission pipe 31 enclosed by its shell 31a.
- the level regulation control part-unit 50 is also belonging to the pump unit 32. Also belonging to the pump unit 32 is the level regulation control part-unit 50, the ' task of which is to switch on or switch off the operation of the pump unit 32 depending on the level of the wastewater in the reception area 14 of the sump 10.
- the blow-off gap 34c is a small, 1 mm in diameter, conical bore hole, the cross-section of which monotonically increases from the direction of the medium transmission space 35 of the pump unit 32 towards the reception space 14 of the sump 10, while the blow-off opening 31c is a cylindrical bore hole 1 mm in diameter.
- This version of the blow-off gap 34c can be formed by drilling, punching or even casting, while the blow-off opening 31c can be made by drilling or punching.
- the advantage of drilling and punching is that using this technology the blow-off opening 31c and the blow-off gap 34c can be made subsequently in the given component.
- Figure 2 shows a version of the pump unit 32 in the wall of which 34, starting from the input opening 34a and extending over the base plane 36a of the impeller 36 the thin, cleft-like blow-off gap 34c can be found.
- a blow-off gap 34c can be formed by sawing or casting in the wall of the pump unit.
- Figure 3 shows a detail of a pump unit where there is an air bleed valve 38 fitted in the blow-off gap 34c of the wall 34. It is practical to fit an air bleed valve 38 into the blow-off gap 34c in such cases when due to the composition of the transported wastewater it is better to leave a larger air flow opening, but it is important that the releasing of any air blocks formed is carried out when certain pressure conditions are reached.
- Figure 4 shows the section of the transmission pipe 31 in the vicinity of the blow-off opening 3 Ic, in which blow-off opening 31c there is also an air bleed valve 38 fitted.
- blow-off openings 31c and blow-off gaps 34c their size and position is always dependent on the physical characteristics of the transported wastewater, the operation parameters of the pump unit 32 and its geometric dimensions, as well as on the method of connecting the pup unit 32 to the transmission pipe 31, so these may differ in different cases. In every case, however, it is important for there to be at least one blow-off gap 34c or blow-off opening 31c in the output part-unit in order to avoid the formation of air blocks.
- wastewater flowing in through the feed pipe-end 21 of the input part-unit 20 in the reception space 14 of a normally constructed sump 10 that has an output part-unit 30 with one or more blow-off gaps 34c and/or blow-off openings 31c covers the base 12 of the sump 10 and starts to rise in the reception space 14.
- the level of the wastewater reaches and exceeds the upper edge of the input openings 34a formed in the wall 34 of the pump unit 32, then the air in the area of the medium transmission space 35 of the wall 34 in the vicinity of the impeller 36 gets stuck.
- the hydrostatic pressure deriving from the height of the wastewater continuing to rise in the reception space 14 of the sump 10 attacks the lower part of the air block stuck in the medium transmission space 35 with a continuously increasing force.
- this force reaches a limit value
- the air in the air block leaves the medium transmission space 35 or the section of the internal space 31b of the transmission pipe 31 that forms the continuation of the medium transmission space 35 through the blow-off gap 34c, or through the air bleed valve 38 fitted in it, or through the blow-off opening 31c, or through the air bleed valve 38 fitted in it, and so the wastewater is able to flow into the part of the medium transmission space 35 of the wall 34 surrounding the impeller 36.
- the wastewater itself surrounds the impeller 36 of the pump unit 32 then it is able to transport wastewater. So the adjustment of the level regulation control part-unit 50 is to be carried out so that the height of the level of the wastewater reaches the value needed to cause blow-off before the level regulation control part-unit 50 switches on the pump unit 32.
- the wastewater lifting pump according to the invention can be used well in all areas where due to the pressure difference between the collection pipe and the sump, it may happen that the wastewater is essentially completely drained from the reception space of the sump and a s a consequence of this the impeller may run dry.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU0500140U HU3085U (en) | 2005-06-21 | 2005-06-21 | Sewage lifting machinery |
PCT/HU2006/000052 WO2006136868A1 (en) | 2005-06-21 | 2006-06-21 | Wastewater lifting pump with improved features |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1945867A1 true EP1945867A1 (en) | 2008-07-23 |
Family
ID=34917392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06744406A Withdrawn EP1945867A1 (en) | 2005-06-21 | 2006-06-21 | Wastewater lifting pump with improved features |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1945867A1 (en) |
HU (1) | HU3085U (en) |
WO (1) | WO2006136868A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL2005425C2 (en) * | 2010-09-30 | 2012-04-02 | Nijhuis Pompen B V | PUMP DEVICE. |
CN104912185A (en) * | 2015-05-14 | 2015-09-16 | 苏州格赛特环保设备有限公司 | Prefabricated pump station base |
CN114396111B (en) * | 2021-12-28 | 2024-02-06 | 威乐(中国)水泵系统有限公司 | Sewage lifting device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB375495A (en) * | 1931-05-13 | 1932-06-30 | Alan Gordon Morris | Improvements in or relating to centrifugal fluid pumps |
DE2228305A1 (en) * | 1972-06-09 | 1973-12-20 | Siemens Ag | SUBMERSIBLE PUMP |
DE4432224A1 (en) * | 1994-09-10 | 1996-03-14 | Elektra Beckum Ag | Method to improve suction efficiency of flow demand pump |
-
2005
- 2005-06-21 HU HU0500140U patent/HU3085U/en unknown
-
2006
- 2006-06-21 EP EP06744406A patent/EP1945867A1/en not_active Withdrawn
- 2006-06-21 WO PCT/HU2006/000052 patent/WO2006136868A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006136868A1 * |
Also Published As
Publication number | Publication date |
---|---|
HU0500140V0 (en) | 2005-08-29 |
WO2006136868A1 (en) | 2006-12-28 |
HU3085U (en) | 2006-04-28 |
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Legal Events
Date | Code | Title | Description |
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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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17P | Request for examination filed |
Effective date: 20080116 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: BA HR MK RS |
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RAX | Requested extension states of the european patent have changed |
Extension state: RS Payment date: 20080114 Extension state: MK Payment date: 20080114 Extension state: HR Payment date: 20080114 Extension state: BA Payment date: 20080114 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20150106 |