EP0333045A1 - Vakuumtransportsystem für Abwasser - Google Patents

Vakuumtransportsystem für Abwasser Download PDF

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Publication number
EP0333045A1
EP0333045A1 EP89104226A EP89104226A EP0333045A1 EP 0333045 A1 EP0333045 A1 EP 0333045A1 EP 89104226 A EP89104226 A EP 89104226A EP 89104226 A EP89104226 A EP 89104226A EP 0333045 A1 EP0333045 A1 EP 0333045A1
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EP
European Patent Office
Prior art keywords
suction
pump
tank
discharge
liquid ring
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
Application number
EP89104226A
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English (en)
French (fr)
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EP0333045B1 (de
Inventor
Thierry Fournier
Alain Besombes
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Evac Saed
Original Assignee
Evac Saed
Alsthom Fluides Sapag SA
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Application filed by Evac Saed, Alsthom Fluides Sapag SA filed Critical Evac Saed
Publication of EP0333045A1 publication Critical patent/EP0333045A1/de
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F04C19/001—General arrangements, plants, flowsheets
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
    • E03F1/006—Pneumatic sewage disposal systems; accessories specially adapted therefore

Definitions

  • Waste water evacuation systems have been known for a long time. Such waters often contain poorly resistant materials. They come in particular from water closet bowls. They circulate in the vacuum evacuation conduits in the form of bundles which occupy the entire section of the conduit and which are therefore called plugs. These plugs are followed by air masses which ensure their propulsion.
  • vacuum evacuation has three essential advantages: - the diameters of the conduits required for vacuum evacuation are much smaller than the diameters necessary for gravity evacuation, - unlike gravity evacuation, vacuum evacuation works regardless of the slope of the conduits. In particular, it allows the flow to go up to a maximum height corresponding to the value of the depression expressed in meters of water column, - the evacuation of water from a closet requires only a small volume of flushing: less than 1.5 liters of water, compared to 6 to 9 liters for gravity drainage systems.
  • a first known technique consists in collecting the waste water in a tank which is put under vacuum by means of a vacuum pump. The function of this pump is only to create and maintain a vacuum in the installation. So it only sucks air. To be able to drain the tank without interrupting the operation of the installation, another pump must be able to suck up the materials under vacuum, or provide sophisticated airlock systems. Furthermore, the wastewater being stored under vacuum, the aerobic degradation of the materials does not take place.
  • a second technique is known from French patent n ° 82 04710. It consists of completing the installation with vacuum pump by a barometric column which allows to transfer wastewater continuously from the vacuum network to a collector at atmospheric pressure.
  • the storage tank is no longer essential.
  • the major drawback of this technique is that it requires a significant height (5 to 10 m) between the collector and the low point of the vacuum network.
  • a third known technique is described in French patent No. 2,308,742 and its American correspondent No. 4,034,421. According to this technique, a storage tank is used at atmospheric pressure. A circulation pump sucks the wastewater stored in this tank, and discharges it under pressure into an ejector, the diverging line of which returns it to the tank. The neck of the ejector is connected to the evacuation network in which it maintains the vacuum. Wastewater, air and materials are thus transferred from the vacuum network to the tank via the ejector.
  • This technique has the advantage of leaving the storage tank at atmospheric pressure without major complication of the installation.
  • a fourth known technique consists in using a vacuum pump with an Archimedes screw to create and maintain the vacuum in a tank connected to the wastewater collection network.
  • a special screw pump capable of sucking liquids and gases has been developed for this application. This pump is not, however, capable of passing solids. The tank must therefore be equipped to sort the materials and grind them. Installation then becomes much more complex.
  • the object of the present invention is in particular to provide a simple system for evacuating waste water under vacuum. It also aims to make this system robust, energy efficient and directly connectable, with or without storage tank, to a manifold at atmospheric pressure, without barometric column height constraints.
  • a system according to the invention comprises the following elements which are common, at least as regards some of their purposes for this system and for a known system produced according to the third known technique mentioned above: a tubular collector for receiving said wastewater in the form of successive plugs, as well as air masses consecutive to these plugs and coming from the atmosphere, - and circulation, suction and discharge means connected to this manifold to suck up these plugs and these consecutive air masses by lowering the air pressure in said manifold to a suction pressure below atmospheric pressure, and for discharging said wastewater under a discharge pressure greater than said suction pressure and sufficient to allow their discharge.
  • said circulation, suction and discharge means comprise in particular said circulation pump and said ejector, the latter for constituting suction and discharge means.
  • the system according to the invention is characterized in that said suction and discharge circulation means comprise - a liquid ring pump provided with a suction passage connected to said collector, a discharge passage for the evacuation of said waste water, and a water supply passage for receiving a minority flow of supply water suitable for forming and / or maintaining a liquid ring in this pump, - And water supply means for supplying said feed water.
  • said means of circulation, suction and discharge also comprise a reservoir receiving and temporarily containing said waste water under a storage pressure greater than said suction pressure.
  • said reservoir is connected to said delivery passage of said liquid ring pump.
  • a supply pipe connects a lower part of said tank to said suction passage of said liquid ring pump so as to suck up a minority flow of waste water from this tank to maintain said liquid ring, said water supply means supplying clear water and being controllable from so as to be able to stop supplying this clear water when this ring can be maintained by this waste water.
  • the system further comprises valves and piping to allow, after a period of storage of said wastewater in said tank, which then constitutes a storage tank, to empty this tank under the action of suction and discharge of said pump with liquid ring.
  • Said valves and pipes for emptying said storage tank comprise an air introduction valve which, when open, communicates said suction passage of said liquid ring pump with the atmosphere, - a separation valve which, when closed, eliminates the connection of this suction passage to said manifold, - And a drain pipe connecting a lower part of said storage tank to an evacuation zone so that, during a storage period during which this air introduction valve is closed and this separation valve open, this pump sucks said plugs and said consecutive air masses and discharges said waste water into said tank to store this waste water there, and so that, during a draining period during which this air introduction valve is open and this valve closed separation, this same pump draws an air flow from the atmosphere and discharges this air flow into said storage tank under a drain pressure which constitutes said discharge pressure and which is higher than the
  • - Said storage tank is provided with an aeration valve which is located in the upper part and which is closed during said emptying period, and a drain valve which is located on said emptying pipe and which is open for this emptying period.
  • - Said collector is connected to said suction passage of said liquid ring pump by means of a heavy particle trap.
  • said tank is a storage tank for storing said waste water during said aeration time
  • said delivery passage communicates with this tank by means of a delivery pipe opening out at the bottom of this tank, so that the air discharged by this pump rises in the form of bubbles through the thickness of the waste water stored in this tank -
  • said liquid ring pump comprises - a pump body having a generally cylindrical peripheral wall around a body axis, - a rotor provided with blades, having a rotor axis and rotating in this body around this axis, the latter being offset relative to said body axis, - a motor to drive this rotor, a distributor constituting a wall in contact with the interior space of said pump body, - a suction light and a discharge light pierced in this distributor, - And a feed passage allowing water to be introduced into said body so that the water thus introduced constitutes a liquid ring driven in rotation by said blades of the rotor and pressed by centrifugal
  • said suction light is sufficiently wide to contain a circle with a diameter of approximately 40 mm, so as to facilitate the suction of weak materials which can form part of said plugs.
  • said liquid ring pump is further provided with tubular suction and delivery passages connected respectively to said suction and delivery ports and each having an axis.
  • said axis of said suction passage and preferably that of said delivery passage are substantially parallel to said body and rotor axes and their extensions pass substantially through said suction and discharge ports, respectively.
  • a liquid ring pump known for this use and shown in fig.1 comprises a rotor 11 provided with blades 11A and driven by an electric motor 10. This rotor rotates in a pump body 12 around a axis 11B parallel to the axis 12A of this body.
  • the gas to be pumped enters through a suction flange 13 of a flange 14. It then passes into the pump body through a suction port 15 of a distributor 16 (see fig.3).
  • the compressed gas is finally discharged by a discharge port 17 from the distributor and discharged by a discharge flange from the flange.
  • a liquid ring 92 (see fig. 2) consists of water which has been introduced in suitable volume into the body 12 and driven in rotation by the rotor 11. It is pressed by centrifugal force against the cylindrical wall of this body and leaves a free axial volume for gas suction and compression. It constitutes a gas seal between the rotor blades and the wall of the pump body. Two successive blades and the liquid ring delimit a rotating chamber, the volume of which is large when it passes opposite the suction light 15 and small opposite the discharge light 17.
  • FIG. 5 shows a first system in which the liquid ring pump is connected to a vacuum water collection network for wastewater.
  • This network is shown schematically by a collector 42 to which is connected a water closet bowl provided with a flush and a vacuum-tight discharge valve. This flush and this valve are of known types and are not shown.
  • the suction flange 33 is connected to the collection network.
  • the discharge flange 34 is connected via the pipe 41 directly to the discharge pipe or sewer 44 which is at atmospheric pressure.
  • the operation of the liquid ring pump requires a low flow water supply, intended to maintain the volume of the liquid ring and to ensure cooling. This supply reaches the supply port 19 of the pump by means of the conduit 45, the flow rate being regulated by the valve 46.
  • the liquid ring pump ensures the transfer of gases, water and solid materials from the vacuum network to the sewer 44 at atmospheric pressure, as well as the grinding of these solid materials.
  • a trap is placed upstream of the liquid ring pump to retain very heavy particles, such as for example metallic objects, which could have been introduced, by accident or maliciously, into the wastewater collection system which could damage the liquid ring pump.
  • This trap can be constituted by a simple box 51 through which the wastewater transits, the inlet / outlet orifices 52 and 53 being placed at the top of the box so that heavy objects fall to the bottom of the box and fail at the pump.
  • the box can be emptied periodically by means of an inspection hatch 54.
  • a non-return valve 55 capable, by via a relay 57, to start the pump on a high pressure threshold and to stop it on a low pressure threshold.
  • a vacuum switch 56 capable, by via a relay 57, to start the pump on a high pressure threshold and to stop it on a low pressure threshold.
  • a drawback of the first system which has just been described according to the invention is the need to supply the liquid ring with clear water, which penalizes the water consumption of the entire installation.
  • a storage tank 61 as indicated in FIG. 6.
  • This tank is provided with 'a ventilation chimney 62 and a drain pipe 63 closed by a valve 64.
  • the tank is emptied either periodically or continuously, by any means not described here, without the level falling below a minimum level located above the supply nozzle of a pipe 65 connecting the base of the tank to the suction pipe 66 of the liquid ring pump.
  • the liquid ring can be supplied by recirculating part of the wastewater, the flow in the conduit 65 being effected without an auxiliary pump, under the effect of the vacuum created by the liquid ring pump.
  • a supply of clear water 45 is however necessary in the start-up phase of the pump. This supply is then cut by the valve 46.
  • FIG. 6 Another preferred arrangement also shown in FIG. 6 consists in extending the discharge line 71 of the liquid ring pump to the bottom of the tank.
  • the air discharged by the pump escapes from the discharge pipe in the form of bubbles. This bubbling is conducive to aerobic degradation of the materials contained in the tank.
  • the liquid ring pump is also used for emptying the storage tank. More particularly, here a temporary use is made of a liquid ring pump which is known in itself and according to which such a pump can operate as an air compressor.
  • a separation valve 81 through which the storage tank is connected to the vacuum network and an air introduction valve 82 is opened which allows communication with the atmosphere.
  • the pump then sucks in air at atmospheric pressure which it compresses by discharging it into the tank.
  • a valve 83 located on the tank ventilation chimney. If a tank drain valve 84 is then opened, it results in a pressure drain of the latter. It is thus possible to discharge the waste water into a drain pipe 86 to a collecting duct 88 located higher than the tank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19890104226 1988-03-11 1989-03-09 Vakuumtransportsystem für Abwasser Expired - Lifetime EP0333045B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803209 1988-03-11
FR8803209A FR2628459B1 (fr) 1988-03-11 1988-03-11 Systeme d'evacuation sous vide d'eaux usees

Publications (2)

Publication Number Publication Date
EP0333045A1 true EP0333045A1 (de) 1989-09-20
EP0333045B1 EP0333045B1 (de) 1995-09-06

Family

ID=9364197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890104226 Expired - Lifetime EP0333045B1 (de) 1988-03-11 1989-03-09 Vakuumtransportsystem für Abwasser

Country Status (6)

Country Link
EP (1) EP0333045B1 (de)
DE (1) DE68924081T2 (de)
DK (1) DK172092B1 (de)
FI (1) FI891094A (de)
FR (1) FR2628459B1 (de)
NO (1) NO891008L (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694317A1 (fr) * 1992-07-28 1994-02-04 Felden Jean Marie Installation pour le traitement de matières fécales et le nettoyage de sanitaires de moyens de transport pour passagers.
EP1172492A2 (de) 2000-07-10 2002-01-16 Evac International Oy Vakuumsystem
EP1490599A2 (de) * 2002-03-15 2004-12-29 Water Management Systems Pumpensystem mit unterdruckquelle
EP1832689A1 (de) * 2006-03-06 2007-09-12 ROEDIGER VAKUUM- und HAUSTECHNIK GmbH Unterdruckabwassereinrichtung
US7878768B2 (en) 2007-01-19 2011-02-01 David Muhs Vacuum pump with wear adjustment
US8381324B2 (en) 2006-12-21 2013-02-26 Evac International Oy Vacuum sewage system
RU2509844C2 (ru) * 2008-07-10 2014-03-20 Джетс Ас Способ управления источником вакуума в вакуумной канализационной системе
US8998586B2 (en) 2009-08-24 2015-04-07 David Muhs Self priming pump assembly with a direct drive vacuum pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20011506A (fi) * 2001-07-10 2003-01-11 Evac Int Oy Tyhjiökeräysjärjestelmä
DE102011016243A1 (de) * 2011-04-06 2012-10-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Sonderentwässerungssystem
FI127077B (en) 2016-04-19 2017-10-31 Evac Oy A method for checking a vacuum waste system and a vacuum waste system
CN117432040B (zh) * 2023-12-19 2024-03-15 山东瀚广建设项目管理有限公司 一种建设工程用排水装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492171A (en) * 1923-04-11 1924-04-29 Irving C Jennings Sewage ejector
FR2127865A5 (de) * 1971-03-03 1972-10-13 Nash Engineering Co
US3956776A (en) * 1975-05-28 1976-05-18 Thetford Corporation Liquid waste material conveying system for toilets and the like
FR2308742A1 (fr) * 1975-04-23 1976-11-19 Ifoe Ab Perfectionnements aux systemes d'assainissement a vide a recipient collecteur
DE3418326A1 (de) * 1984-05-17 1985-11-21 Willi 4973 Vlotho Cordes Abwasser-pumpstation
DE8708108U1 (de) * 1987-06-09 1987-08-06 Siemens AG, 1000 Berlin und 8000 München Flüssigkeitsringmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1492171A (en) * 1923-04-11 1924-04-29 Irving C Jennings Sewage ejector
FR2127865A5 (de) * 1971-03-03 1972-10-13 Nash Engineering Co
FR2308742A1 (fr) * 1975-04-23 1976-11-19 Ifoe Ab Perfectionnements aux systemes d'assainissement a vide a recipient collecteur
US3956776A (en) * 1975-05-28 1976-05-18 Thetford Corporation Liquid waste material conveying system for toilets and the like
DE3418326A1 (de) * 1984-05-17 1985-11-21 Willi 4973 Vlotho Cordes Abwasser-pumpstation
DE8708108U1 (de) * 1987-06-09 1987-08-06 Siemens AG, 1000 Berlin und 8000 München Flüssigkeitsringmaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2694317A1 (fr) * 1992-07-28 1994-02-04 Felden Jean Marie Installation pour le traitement de matières fécales et le nettoyage de sanitaires de moyens de transport pour passagers.
US8246316B2 (en) 1999-03-22 2012-08-21 David Muhs Vacuum source and float valve for a self-priming pump
EP1172492A2 (de) 2000-07-10 2002-01-16 Evac International Oy Vakuumsystem
EP1172492A3 (de) * 2000-07-10 2003-01-22 Evac International Oy Vakuumsystem
EP1490599A2 (de) * 2002-03-15 2004-12-29 Water Management Systems Pumpensystem mit unterdruckquelle
EP1490599A4 (de) * 2002-03-15 2007-07-11 Water Man Systems Pumpensystem mit unterdruckquelle
EP1832689A1 (de) * 2006-03-06 2007-09-12 ROEDIGER VAKUUM- und HAUSTECHNIK GmbH Unterdruckabwassereinrichtung
US8381324B2 (en) 2006-12-21 2013-02-26 Evac International Oy Vacuum sewage system
US7878768B2 (en) 2007-01-19 2011-02-01 David Muhs Vacuum pump with wear adjustment
RU2509844C2 (ru) * 2008-07-10 2014-03-20 Джетс Ас Способ управления источником вакуума в вакуумной канализационной системе
US9932114B2 (en) 2008-07-10 2018-04-03 Jets As Method for controlling the vacuum generator(s) in a vacuum sewage system
US8998586B2 (en) 2009-08-24 2015-04-07 David Muhs Self priming pump assembly with a direct drive vacuum pump

Also Published As

Publication number Publication date
DK172092B1 (da) 1997-10-20
NO891008D0 (no) 1989-03-09
FR2628459B1 (fr) 1992-07-31
DK117289D0 (da) 1989-03-10
FI891094A (fi) 1989-09-12
DE68924081D1 (de) 1995-10-12
FI891094A0 (fi) 1989-03-08
DE68924081T2 (de) 1996-02-01
FR2628459A1 (fr) 1989-09-15
EP0333045B1 (de) 1995-09-06
NO891008L (no) 1989-09-12
DK117289A (da) 1989-09-12

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