EP3724508B1 - Device for protection of wastewater pumps for wet accumulation chambers - Google Patents
Device for protection of wastewater pumps for wet accumulation chambers Download PDFInfo
- Publication number
- EP3724508B1 EP3724508B1 EP18842676.1A EP18842676A EP3724508B1 EP 3724508 B1 EP3724508 B1 EP 3724508B1 EP 18842676 A EP18842676 A EP 18842676A EP 3724508 B1 EP3724508 B1 EP 3724508B1
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- EP
- European Patent Office
- Prior art keywords
- separation chamber
- pipe
- wastewater
- solid particles
- rods
- 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.)
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- 239000002351 wastewater Substances 0.000 title claims description 38
- 238000009825 accumulation Methods 0.000 title claims description 24
- 238000000926 separation method Methods 0.000 claims description 78
- 239000002245 particle Substances 0.000 claims description 52
- 239000007787 solid Substances 0.000 claims description 50
- 230000002457 bidirectional effect Effects 0.000 claims description 23
- 238000005086 pumping Methods 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 206010053567 Coagulopathies Diseases 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000035602 clotting Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- -1 hygienic tissues Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004075 wastewater filtration Methods 0.000 description 1
Images
Classifications
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- 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
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- 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
- F04D13/12—Combinations of two or more pumps
- F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
-
- 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
-
- 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
Definitions
- the technical solution relates to a device for protection of pumps in communal wastewater pumping stations, those from industry, agriculture, rain water or drinking and raw water.
- pumps comprising a crushing device often suffer from rapid abrasion of crushing devices resulting in their non-functioning. Consequently, the pumps are blocked and damaged, which require physical cleaning of pumps or their maintenance.
- Document US 5 954 484 A discloses a sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage.
- the station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via connection pipes.
- Each solid waste collection chamber is connected to a pump to empty the collection tank via one of the connection pipes and solid waste collection chambers to pump the current of sewage into a pressure pipeline.
- Waste water containing solid particles flowing through an inlet pipe into a wet accumulation chamber is directed to the separation chamber through a supply pipe. It further flows from the separation chamber through the solid particles separator via the biderictional pipe and through a pump into the wet accumulation chamber.
- the solid particles separator captures solid particles and thereby they accumulate in the separation chamber. Particles having higher dimensional weight (sand, gravel) than a pumped medium accumulate at the bottom of the separation chamber due to sedimentation and they do not pass further onto a pump impeller.
- pressurised water is pumped back from the wet accumulation chamber through the bidirectional pipe, solid particles separator and through the separation chamber into the discharge pipe and further to a sewerage network. Simultaneously, the separator is washed by reverse pumping of wastewater. A reversing valve precludes reverse flow of wastewater into the supply pipe.
- a solid particle is understood to be a solid particle having dimensions exceeding a throughput rate of a pump impeller installed in a pumping station or a particle capable of causing abrasion of blades of the pump impeller.
- Sand, gravel as well as fabrics, hygienic tissues, foils of various types, clusters of various materials and the likes can form the solid particle.
- the separation chamber is shaped as a cylinder that may be arranged either vertically or horizontally.
- the separation chamber comprises an upper part, bottom and side wall/walls.
- the separation chamber further comprises openings for respective pipes.
- a bidirectional pipe and a discharge pipe are attached in a lower part of the separation chamber so that their orifices are situated opposite each other across the separation chamber.
- the lower part of the separation chamber is meant to be a space immediately above the bottom of the separation chamber.
- the supply pipe is situated so that it opens into the separation chamber on its top.
- the reversing valve may consist of for example a seat and a float ball. During pumping water pressure presses the float ball into the seat preventing backflow of wastewater.
- the discharge pipe directs from a side wall of the chamber first obliquely upward at an angle of 30° to 70° with respect to the bottom of the separation chamber, more preferably at an angle of 50° and then it is curved so that it is directed perpendicularly upward. It is an advantage of said embodiment that the pipe does not include a right angle and solid particles are discharged through the discharge pipe without any problems by water pressure.
- the bidirectional pipe is branched.
- One branch opens through a side wall into the lower part of the separation chamber, like in the previous case, and the other branch opens through the side wall into the upper part of the separation chamber.
- the upper part of the separation chamber is understood as a space of the separation chamber below the reversing valve.
- Both branches are attached to the separation chamber through an individual solid particles separator. Branching of the bidirectional pipe into two height levels results in enhancement of hydraulic characteristics in the separation chamber. After the pump is switched on, pressurised flow is partially directed through one branch of the bidirectional pipe to the upper part of the separation chamber and a part of the pressurised flow is directed through another branch of the bidirectional pipe to the lower part of the separation chamber.
- the supply pipe is in the form of a perforated inlet trough. From a certain height walls of the inlet trough are provided with filtration perforations.
- the function of the trough is on one hand directing water into the separation chamber, but simultaneously also separation and filtration of storm sewage through perforations in the side walls of the trough. Size of perforations in the side walls of the trough is dimensioned according to the throughput rate of the pump impeller installed in the pumping station. Arrangement of perforations on the walls, their amount and design are determined by the value of the maximal critical inlet into the pumping station.
- an average daily flow is securely let into the separation chamber through the inlet trough and eventual critical flow is passed through the filtration perforation directly into the wet accumulation chamber in order to avoid flooding of the separation chamber.
- Filtration perforations prevent passing the solid particles of sizes greater than the throughput rate of the pump impeller into the accumulation chamber and said solid particles are passed through into the separation chamber by the trough.
- the accumulation chamber may comprise a plurality of pumps, in that case each pump is provided with a separate device according to the present solution. Said devices may, however, share one supply pipe or inlet trough.
- a sieve having opening sizes dimensioned according to the throughput rate of a pump impeller may be a solid particles separator.
- a disadvantage of the sieve is that it is quickly clogged, in particularly, when there are fabrics or disposable hygienic tissues and the like in wastewater. In addition, when wastewater is pumped reversely the separator is only partially washed as the said fabrics tend to enmesh into the sieve.
- a device may comprise a rod solid particles separator.
- the rod separator consists of a frame provided about the inner circumference with rods having at minimum two or three or more lengths.
- the frame may preferably be of an annular shape.
- the outer circumference of the grame may be of a square, rectangular or other geometric shape.
- Rods are arranged alternately (long, short, long, short) on the frame. Rods protrude radially from the body plane onto one side at an angle in such a manner that a surface that longitudally intersects all rods forms a truncated cone or truncated pyramid (frustum).
- Rods are arranged so that a space between two neighboring rods and at the same time space between free ends of any two long rods does not exceed the size the throughput rate of the pump impeller is dimensioned for.
- a distance between the rods is in the range of 15 to 100 mm.
- Rod length may be for example 20 and 50 mm, 20 and 60mm, 15 and 60mm, 20 and 80mm and the like. Length of the rods primarily depends on the throughput rate of the pump impeller.
- Said rod solid particles separator is positioned between a flange of the bidirectional pipe and a flange of the separation chamber in a way the rods are directed into the space of the separation chamber.
- the rod separator may be preferably provided with means for fastening in the flange e.g. in the form of openings.
- the rod separator may be preferably provided with at least one groove for mounting a sealing.
- the pump is commonly positioned at the bottom of the wet accumulation chamber and according to the present technical solution it may be attached to bidirectional pipe of the device by means of a dismountable coupling through a pipe of the pump.
- the discharge pump of the device may be connected by a dismountable coupling to the discharge pump of the pumping station. Lengths of individual pipes depend on a depth of the pumping station and a distance of the inlet pipe of wastewater from the bottom of the pumping station.
- the bidirectional pipes and the pipe of the pump as well as the discharge pipe and the discharge pipe of the pumping station are connected with dismountable couplings at the separation chamber proximity.
- the device according to the present technical solution provides for the pump not to come into contact with solid particles that cause its excessive wearing-off, clogging and breakdowns.
- the device according to the present technical solution provides a plurality of economic and ecological advantages, namely the device can be installed into wet chambers of new as well as in a majority of existing pumping stations without a requirement of building modifications of the pumping stations. Accordingly, in majority cases the device requires no other than already existing space in the pumping station, nor further construction works. After installation, frequency of dispatching of operator's maintenance workers to the pumping stations for pump cleaning, maintenance and repair purposes decreases, pump life increases, the need for handling the rakings is eliminated resulting in reduction of ecological burden of environment in the surrounding of the pumping station.
- Example 1 (not a part of the present invention):
- Fig. 1 shows a device for protection of wastewater pumps comprising separation chamber 4 substantially in the form of a perpendicularly positioned cylinder. Said separation chamber is provided in its lower part with discharge pipe 9 of the chamber that is further connected by a dismountable coupling onto discharge pipe 9.1 of a pumping station, that is further connected to sewerage network 11 .
- the device further comprises supply pipe 2, connected to inlet pipe 1 .
- Supply pipe 2 is from another side connected from the top to separation chamber 4 to inlet wastewater into separation chamber 4.
- a reversing valve for preventing reverse flow of wastewater into supply pipe 2 is positioned between supply pipe 2 and separation chamber 4.
- Said valve consists of seat 3 arranged on supply pipe 2 and corresponding float ball 5 positioned in separation chamber 4.
- Bidirectional pipe 7 is connected on chamber 4 in the lower part of separation chamber 4 opposite the orifice of discharge pipe 9 of the chamber. Said bidirectional pipe 7 is connected to pump pipe 7.1 and connects the device with pump 10 positioned in wet accumulation chamber 8.
- Rod separator 6 of solid particles is arranged between separation chamber 4 and bidirectional pipe 7. The role of the rod separator 6 of solid particles is separating solid particles contained in wastewater in separation chamber 4.
- wastewater flows from separation chamber 4, through rod solid particles separator 6 via bidirectional pipe 7 into pump 10 and consequently to wet accumulation chamber 8.
- Solid particles contained in wastewater are filtrated by solid particles separator 6 and are accumulated at the bottom of separation chamber 4 .
- pump 10 is switched on.
- wastewater from wet accumulation chamber 8 is pumped back by pump 10 through bidirectional pipe 7 and rod solid particles separator 6 into separation chamber 4.
- An increasing level of pumped wastewater in separation chamber 4 presses float ball 5 onto seat 3, closing the inlet into supply pipe 2.
- Pumped waster continues further from separation chamber 4 into chamber discharge pipe 9 and further to pump station discharge pipe 9.1.
- Solid particles accumulated at the bottom of separation chamber 4 are also discharge from separation chamber 4 by pressure of pumped water into chamber discharge pipe 9 and through pump station discharge pipe 9.1 they are further transported into sewerage network 11.
- Fig. 2 shows an embodiment of the device for pump protection according to the present invention.
- the device comprises all parts of the device according to Example 1.
- the device differs from the device according to Example 1 in that bidirectional pipe 7 is branched.
- One branch opens into a lower part of separation chamber 4, as in Example 1, and another branch opens into an upper part of separation chamber 4.
- Both branches are connected to the separation chamber through a separate solid particles separator 6.1, 6.2 .
- the supply pipe 2 is in the form of a perforated inlet trough.
- Fig. 3 shows a rod solid particles separator which can be used in the device for protection of waste water pumps for wet accumulation chambers according to the present invention, consisting of frame 12 of annular shape where said ring is about its inner circumference provided with rods 13 and 14 of at least two lengths.
- the rods are on the frame, they are arranged alternately (long, short, long, short). Simultaneously, the rods radially protrude from the frame plane into one side at an angle in a way a plane intersecting their surfaces forms a truncated cone (frustum).
- the rods are arranged so that a space between any two rods does not exceed the size the throughput rate of the pump impeller is dimensioned for. In practice the distance between the rods is in the range of 15 to 100 mm.
- FIG. 4 shows connection of the devices according to the present technical invention in a wet accumulation chamber containing two pumps.
- the devices are similar to the device described in Example 2.
- the devices differ from the device in Example 2 in that they comprise only one common supply pipe 2 in the form of a perforated inlet trough.
- the inlet trough is connected to inlet pipe 1. From a certain height walls of the inlet trough are provided with filtration perforations. Size of the perforations is dimensioned according to the throughput rate of pump impeller 10 and 10'. Arrangement of perforations in the side walls of the inlet trough are determined by a value of the maximal critical inlet into the pumping station. Accordingly, the perforations are arranged in such height of the trough wall that an average daily flow is securely let in to separation chambers 4 and 4' through the inlet trough and eventual critical flow is passed directly into wet accumulation chamber 8.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sewage (AREA)
Description
- The technical solution relates to a device for protection of pumps in communal wastewater pumping stations, those from industry, agriculture, rain water or drinking and raw water.
- At present bar screen baskets and manually or mechanically scraped bar screens or sieves are used for capturing solid particles in wastewater pumping stations. Accordingly, current technologies require frequent human intervention into the process. However, long-term and comprehensive experiences in operating such pumping stations show that said devices suffer from significant drawbacks. Necessary handling of caught solid particles (rakings) that have to be removed from the pumping station and transported to a waste dump or to a wastewater treatment plant is a disadvantage of baskets, bar screens and sieves.
- There are also cases when no devices for separating those particles are installed into pumping stations. In those cases pumps having greater throughput rate and comprising crushing devices are chosen.
- When chosing a pump enjoying a greater throughput rate, pumping over greater solid particles anticipated in wastewater is provided, however, it is a common practice that greater solid particles in wastewater tend to clump. If a pump sucks such a cluster having dimensions greater than a maximum possible throughput of an impeller of the respective pump the pump blocks. Such situations occur in practice quite often.
- On the other hand, pumps comprising a crushing device often suffer from rapid abrasion of crushing devices resulting in their non-functioning. Consequently, the pumps are blocked and damaged, which require physical cleaning of pumps or their maintenance.
- In these cases operation services of pumping stations are financially demanding due to frequent dispatch of maintenance workers to pumping stations. Handling the rakings and pump cleaining often result in contamination of surroundings of a pumping station by wastewater.
- Document
US 5 954 484 A discloses a sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage. The station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via connection pipes. Each solid waste collection chamber is connected to a pump to empty the collection tank via one of the connection pipes and solid waste collection chambers to pump the current of sewage into a pressure pipeline. - The aforementioned drawbacks are removed by the device for protection of wastewater pumps for wet accumulation chambers according to the present technical solution, in which according to the first embodiment a device for protection of wastewater pumps according to claim 1 is provided.
- Waste water containing solid particles flowing through an inlet pipe into a wet accumulation chamber is directed to the separation chamber through a supply pipe. It further flows from the separation chamber through the solid particles separator via the biderictional pipe and through a pump into the wet accumulation chamber. The solid particles separator captures solid particles and thereby they accumulate in the separation chamber. Particles having higher dimensional weight (sand, gravel) than a pumped medium accumulate at the bottom of the separation chamber due to sedimentation and they do not pass further onto a pump impeller. After starting the pump pressurised water is pumped back from the wet accumulation chamber through the bidirectional pipe, solid particles separator and through the separation chamber into the discharge pipe and further to a sewerage network. Simultaneously, the separator is washed by reverse pumping of wastewater. A reversing valve precludes reverse flow of wastewater into the supply pipe.
- A solid particle is understood to be a solid particle having dimensions exceeding a throughput rate of a pump impeller installed in a pumping station or a particle capable of causing abrasion of blades of the pump impeller. Sand, gravel as well as fabrics, hygienic tissues, foils of various types, clusters of various materials and the likes can form the solid particle.
- Preferably, the separation chamber is shaped as a cylinder that may be arranged either vertically or horizontally. The separation chamber comprises an upper part, bottom and side wall/walls. The separation chamber further comprises openings for respective pipes.
- A bidirectional pipe and a discharge pipe are attached in a lower part of the separation chamber so that their orifices are situated opposite each other across the separation chamber. The lower part of the separation chamber is meant to be a space immediately above the bottom of the separation chamber. Such arrangement results in that solid particles pumped together with wastewater accumulated at the bottom of the separation chamber are discharged from the separation chamber into the discharge pipe and transported further to the sewerage network or to the wastewater treatment plant. That results in self-cleaning of the separation chamber from separated solid particles.
- Preferably, the supply pipe is situated so that it opens into the separation chamber on its top. The reversing valve may consist of for example a seat and a float ball. During pumping water pressure presses the float ball into the seat preventing backflow of wastewater.
- Preferably, the discharge pipe directs from a side wall of the chamber first obliquely upward at an angle of 30° to 70° with respect to the bottom of the separation chamber, more preferably at an angle of 50° and then it is curved so that it is directed perpendicularly upward. It is an advantage of said embodiment that the pipe does not include a right angle and solid particles are discharged through the discharge pipe without any problems by water pressure.
- According to the invention the bidirectional pipe is branched. One branch opens through a side wall into the lower part of the separation chamber, like in the previous case, and the other branch opens through the side wall into the upper part of the separation chamber. The upper part of the separation chamber is understood as a space of the separation chamber below the reversing valve. Both branches are attached to the separation chamber through an individual solid particles separator. Branching of the bidirectional pipe into two height levels results in enhancement of hydraulic characteristics in the separation chamber. After the pump is switched on, pressurised flow is partially directed through one branch of the bidirectional pipe to the upper part of the separation chamber and a part of the pressurised flow is directed through another branch of the bidirectional pipe to the lower part of the separation chamber. This results in mixing of the contents of the separation chamber in the immediate moment prior to the discharge of the captured solid particles into the discharge pipe itself. The self-cleaning effect as such is even increased by the present solution and a risk that the separation chamber is not completely cleared of the separated solid particles is minimal.
- Greater filtration capacity of the device that also deals with eventual occurrence of an impact plurality of deposited solid particles is another advantage of the branched bidirectional pipe. Said situation is not exceptional in the practice of sewerage network operations. Accumulation of solid particles at the bottom of the separation chamber may result in partial or total blockage of the flow capacity (clogging) of the first solid particles separator positioned in the lower part of the separation chamber. In the branched bidirectional pipe wastewater filtration will continue through the second solid particles separator positioned in the upper part of the separation chamber and through the upper branch of the bidirectional pipe. After the pump is switched on, wastewater is pumped reversely causing washing the separators and cleaning the separation chamber.
- According to the invention the supply pipe is in the form of a perforated inlet trough. From a certain height walls of the inlet trough are provided with filtration perforations. The function of the trough is on one hand directing water into the separation chamber, but simultaneously also separation and filtration of storm sewage through perforations in the side walls of the trough. Size of perforations in the side walls of the trough is dimensioned according to the throughput rate of the pump impeller installed in the pumping station. Arrangement of perforations on the walls, their amount and design are determined by the value of the maximal critical inlet into the pumping station. Accordingly, an average daily flow is securely let into the separation chamber through the inlet trough and eventual critical flow is passed through the filtration perforation directly into the wet accumulation chamber in order to avoid flooding of the separation chamber. Filtration perforations prevent passing the solid particles of sizes greater than the throughput rate of the pump impeller into the accumulation chamber and said solid particles are passed through into the separation chamber by the trough.
- The accumulation chamber may comprise a plurality of pumps, in that case each pump is provided with a separate device according to the present solution. Said devices may, however, share one supply pipe or inlet trough.
- A sieve having opening sizes dimensioned according to the throughput rate of a pump impeller may be a solid particles separator. A disadvantage of the sieve is that it is quickly clogged, in particularly, when there are fabrics or disposable hygienic tissues and the like in wastewater. In addition, when wastewater is pumped reversely the separator is only partially washed as the said fabrics tend to enmesh into the sieve.
- According to a preferred embodiment a device according to the present technical solution may comprise a rod solid particles separator. The rod separator consists of a frame provided about the inner circumference with rods having at minimum two or three or more lengths. The frame may preferably be of an annular shape. Alternatively, the outer circumference of the grame may be of a square, rectangular or other geometric shape. Rods are arranged alternately (long, short, long, short) on the frame. Rods protrude radially from the body plane onto one side at an angle in such a manner that a surface that longitudally intersects all rods forms a truncated cone or truncated pyramid (frustum). Rods are arranged so that a space between two neighboring rods and at the same time space between free ends of any two long rods does not exceed the size the throughput rate of the pump impeller is dimensioned for. In practice a distance between the rods is in the range of 15 to 100 mm. Rod length may be for example 20 and 50 mm, 20 and 60mm, 15 and 60mm, 20 and 80mm and the like. Length of the rods primarily depends on the throughput rate of the pump impeller. Said rod solid particles separator is positioned between a flange of the bidirectional pipe and a flange of the separation chamber in a way the rods are directed into the space of the separation chamber. The rod separator may be preferably provided with means for fastening in the flange e.g. in the form of openings. The rod separator may be preferably provided with at least one groove for mounting a sealing.
- Increasing of filtration surface of the solid particles separator resulting in lowering a risk of clotting the separator is an advantage of the rod design of the separator. In addition, during reverse pumping of wastewater the separator is washed more thoroughly as fabrics tend to slip from the rods.
- The pump is commonly positioned at the bottom of the wet accumulation chamber and according to the present technical solution it may be attached to bidirectional pipe of the device by means of a dismountable coupling through a pipe of the pump. The discharge pump of the device may be connected by a dismountable coupling to the discharge pump of the pumping station. Lengths of individual pipes depend on a depth of the pumping station and a distance of the inlet pipe of wastewater from the bottom of the pumping station.
- For better handling during installation of the device according to the present technical solution into a pumping station the bidirectional pipes and the pipe of the pump as well as the discharge pipe and the discharge pipe of the pumping station are connected with dismountable couplings at the separation chamber proximity.
- The device according to the present technical solution provides for the pump not to come into contact with solid particles that cause its excessive wearing-off, clogging and breakdowns.
- The device according to the present technical solution provides a plurality of economic and ecologic advantages, namely the device can be installed into wet chambers of new as well as in a majority of existing pumping stations without a requirement of building modifications of the pumping stations. Accordingly, in majority cases the device requires no other than already existing space in the pumping station, nor further construction works. After installation, frequency of dispatching of operator's maintenance workers to the pumping stations for pump cleaning, maintenance and repair purposes decreases, pump life increases, the need for handling the rakings is eliminated resulting in reduction of ecological burden of environment in the surrounding of the pumping station.
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Fig. 1 shows a device for protection of waste water pumps for wet accumulation chambers according to a first example which is not a part of the present invention. -
Fig. 2 shows a device for protection of waste water pumps for wet accumulation chambers according to a second example which is according to the present invention -
Fig. 3 illustrates a design of a rod solid particles separator. -
Fig. 4 shows a device for protection of waste water pumps for wet accumulation chambers which contains two pumps and a supply pipe which is in the form of a perforated inlet through according to the present invention. -
Fig. 1 shows a device for protection of wastewater pumps comprisingseparation chamber 4 substantially in the form of a perpendicularly positioned cylinder. Said separation chamber is provided in its lower part withdischarge pipe 9 of the chamber that is further connected by a dismountable coupling onto discharge pipe 9.1 of a pumping station, that is further connected to sewerage network 11. The device further comprisessupply pipe 2, connected to inlet pipe 1.Supply pipe 2 is from another side connected from the top toseparation chamber 4 to inlet wastewater intoseparation chamber 4. A reversing valve for preventing reverse flow of wastewater intosupply pipe 2 is positioned betweensupply pipe 2 andseparation chamber 4. Said valve consists ofseat 3 arranged onsupply pipe 2 and corresponding float ball 5 positioned inseparation chamber 4.Bidirectional pipe 7 is connected onchamber 4 in the lower part ofseparation chamber 4 opposite the orifice ofdischarge pipe 9 of the chamber. Saidbidirectional pipe 7 is connected to pump pipe 7.1 and connects the device withpump 10 positioned inwet accumulation chamber 8. Rod separator 6 of solid particles is arranged betweenseparation chamber 4 andbidirectional pipe 7. The role of the rod separator 6 of solid particles is separating solid particles contained in wastewater inseparation chamber 4. - During operation of the device wastewater flows from
separation chamber 4, through rod solid particles separator 6 viabidirectional pipe 7 intopump 10 and consequently towet accumulation chamber 8. Solid particles contained in wastewater are filtrated by solid particles separator 6 and are accumulated at the bottom ofseparation chamber 4. When water surface inwet accumulation chamber 8 reaches a setswitching level pump 10 is switched on. Afterpump 10 is switched on wastewater fromwet accumulation chamber 8 is pumped back bypump 10 throughbidirectional pipe 7 and rod solid particles separator 6 intoseparation chamber 4. An increasing level of pumped wastewater inseparation chamber 4 presses float ball 5 ontoseat 3, closing the inlet intosupply pipe 2. Pumped waster continues further fromseparation chamber 4 intochamber discharge pipe 9 and further to pump station discharge pipe 9.1. Solid particles accumulated at the bottom ofseparation chamber 4 are also discharge fromseparation chamber 4 by pressure of pumped water intochamber discharge pipe 9 and through pump station discharge pipe 9.1 they are further transported into sewerage network 11. -
Fig. 2 shows an embodiment of the device for pump protection according to the present invention. - The device comprises all parts of the device according to Example 1. The device differs from the device according to Example 1 in that
bidirectional pipe 7 is branched. One branch opens into a lower part ofseparation chamber 4, as in Example 1, and another branch opens into an upper part ofseparation chamber 4. Both branches are connected to the separation chamber through a separate solid particles separator 6.1, 6.2. According to the invention, but not visible infigure 2 , thesupply pipe 2 is in the form of a perforated inlet trough. -
Fig. 3 shows a rod solid particles separator which can be used in the device for protection of waste water pumps for wet accumulation chambers according to the present invention, consisting offrame 12 of annular shape where said ring is about its inner circumference provided withrods -
Figure 4 shows connection of the devices according to the present technical invention in a wet accumulation chamber containing two pumps. The devices are similar to the device described in Example 2. The devices differ from the device in Example 2 in that they comprise only onecommon supply pipe 2 in the form of a perforated inlet trough. The inlet trough is connected to inlet pipe 1. From a certain height walls of the inlet trough are provided with filtration perforations. Size of the perforations is dimensioned according to the throughput rate ofpump impeller 10 and 10'. Arrangement of perforations in the side walls of the inlet trough are determined by a value of the maximal critical inlet into the pumping station. Accordingly, the perforations are arranged in such height of the trough wall that an average daily flow is securely let in toseparation chambers 4 and 4' through the inlet trough and eventual critical flow is passed directly intowet accumulation chamber 8. -
- 1 -
- Inlet pipe
- 2 -
- Supply pipe
- 3 -
- Reversing valve seat
- 4 -
- Separation chamber
- 5 -
- Float ball
- 6 -
- Solid particles separator
- 6.1 -
- First solid particles separator
- 6.2 -
- Second solid particles separator
- 7 -
- Bidirectional pipe
- 7.1 -
- Pump pipe
- 8 -
- Pumping station wet accumulation chamber
- 9 -
- Chamber discharge pipe
- 9.1 -
- Pump station discharge pipe
- 10 -
- Pump
- 11 -
- Sewerage network
- 12 -
- Solid particles separator rod body
- 13 -
- Separator short rod
- 14 -
- Separator long rod
Claims (6)
- Device for protection of wastewater pumps for wet accumulation chambers, wherein, it comprises:- a separation chamber (4) provided with discharge pipe (9) for discharge wastewater into a sewerage network,- a supply pipe (2), connected to the separation chamber (4), to supply solid particles containing wastewater into the separation chamber (4),- a reversing valve arranged between the supply pipe (2) and the separation chamber (4) in order to prevent reversing flow of wastewater into the supply pipe (2),- a bidirectional pipe (7), connected to the separation chamber (4), for connection of the separation chamber (4) with a pump (10), to supply wastewater from the separation chamber (4) through the pump (10) into a wet accumulation chamber (8) and for reverse flow of wastewater from the wet accumulation chamber (8) through the pump (10) and the separation chamber (4) into the discharge pipe (9),- a solid particles separator (6), arranged between the separation chamber (4) and the bidirectional pipe (7), for retaining solid particles contained in wastewater into the separation chamber (4), and wherein- the bidirectional pipe (7) and the discharge pipe (9) are arranged so that they open into the separation chamber (4) opposite to each other in a lower part of the separation chamber (4), and wherein- the bidirectional pipe (7) is branched, where one branch opens into the lower part of separation chamber (4) and the second branch opens into the upper part of separation chamber (4), whereas both branches are connected to the separation chamber by a separate solid particles separator (6.1) and (6.2),characterized in that, the supply pipe (2) is in a form of perforated inlet trough.
- Device according to Claim 1, characterised in that, the supply pipe (2) is connected to the separation chamber (4) from the top.
- Device according to Claim 2, characterised in that, the reversing valve consists of a seat (3) and a respective float ball (5) positioned in the separation chamber (4).
- Device according to any one of the preceding claims, characterised in that, the discharge pipe (9) extends from the separation chamber (4) slantwise upwards at an angle of 30° to 70° with respect to the bottom of the chamber (4), preferably at an angle of 50°.
- Device according to any one of the preceding claims, characterised in that, the solid particles separator (6, 6.1, 6.2) contains a frame (12), provided on its inner circumference with rods (13, 14) of at minimum of two lengths, where the rods are on the frame arranged alternately, long rod (13), short rod (14), and where rods (13, 14) protrude radially at an angle from the frame plane on one side in such a manner that a surface that longitudally intersects all rods (13 and 14) forms a truncated cone or pyramid (frustum) and where rods (13, 14) are arranged so that a space between any two neighboring rods (13, 14) and a space between free ends of any two long rods (13) does not exceed the size the throughput rate of the pump impeller is dimensioned for.
- Device according to Claim 5, characterised in that, the frame (12) is in a form of ring.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL18842676T PL3724508T3 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
RS20220236A RS63066B1 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
HRP20220366TT HRP20220366T1 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
SI201830608T SI3724508T1 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SK501192017 | 2017-12-13 | ||
PCT/SK2018/050016 WO2019117821A2 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3724508A2 EP3724508A2 (en) | 2020-10-21 |
EP3724508B1 true EP3724508B1 (en) | 2021-12-22 |
Family
ID=65269026
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18842676.1A Active EP3724508B1 (en) | 2017-12-13 | 2018-12-11 | Device for protection of wastewater pumps for wet accumulation chambers |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP3724508B1 (en) |
ES (1) | ES2909173T3 (en) |
HR (1) | HRP20220366T1 (en) |
HU (1) | HUE057804T2 (en) |
LT (1) | LT3724508T (en) |
PL (1) | PL3724508T3 (en) |
RS (1) | RS63066B1 (en) |
SI (1) | SI3724508T1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4316626A1 (en) * | 2022-08-04 | 2024-02-07 | Chung-Hyo Kim | Filter assembly and foreign substance discharge device including same |
-
2018
- 2018-12-11 LT LTEPPCT/SK2018/050016T patent/LT3724508T/en unknown
- 2018-12-11 EP EP18842676.1A patent/EP3724508B1/en active Active
- 2018-12-11 HU HUE18842676A patent/HUE057804T2/en unknown
- 2018-12-11 HR HRP20220366TT patent/HRP20220366T1/en unknown
- 2018-12-11 SI SI201830608T patent/SI3724508T1/en unknown
- 2018-12-11 RS RS20220236A patent/RS63066B1/en unknown
- 2018-12-11 ES ES18842676T patent/ES2909173T3/en active Active
- 2018-12-11 PL PL18842676T patent/PL3724508T3/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4316626A1 (en) * | 2022-08-04 | 2024-02-07 | Chung-Hyo Kim | Filter assembly and foreign substance discharge device including same |
Also Published As
Publication number | Publication date |
---|---|
EP3724508A2 (en) | 2020-10-21 |
ES2909173T3 (en) | 2022-05-05 |
HRP20220366T1 (en) | 2022-05-13 |
HUE057804T2 (en) | 2022-06-28 |
SI3724508T1 (en) | 2022-04-29 |
PL3724508T3 (en) | 2022-05-02 |
LT3724508T (en) | 2022-04-11 |
RS63066B1 (en) | 2022-04-29 |
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