EP1022399A1 - Emptying device for vacuum sewer system - Google Patents
Emptying device for vacuum sewer system Download PDFInfo
- Publication number
- EP1022399A1 EP1022399A1 EP00300093A EP00300093A EP1022399A1 EP 1022399 A1 EP1022399 A1 EP 1022399A1 EP 00300093 A EP00300093 A EP 00300093A EP 00300093 A EP00300093 A EP 00300093A EP 1022399 A1 EP1022399 A1 EP 1022399A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge conduit
- conduit
- valve
- discharge
- vacuum
- 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- Withdrawn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
- 239000010865 sewage Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000033001 locomotion Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/04—Hairdressers' or similar chairs, e.g. beauty salon chairs
- A47C1/06—Hairdressers' or similar chairs, e.g. beauty salon chairs adjustable
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/62—Accessories for chairs
Definitions
- This invention relates to a vacuum sewer system according to the preamble of claim 1.
- a substantial problem with vacuum sewer systems is the conveyance in the sewer of sewage from a point where it is under partial vacuum to a point at atmospheric pressure. This problem has been previously solved in several ways, of which some allow continuous transport of sewage in a vacuum sewer from a space under partial vacuum and others allow only intermittent transport.
- GB-A-2,012,334 discloses a solution which allows continuous transport of sewage. At the end of the vacuum sewer there is a liquid column the height of which corresponds to the partial vacuum in the vacuum sewer. Sewage may continuously flow through this liquid column from the vacuum sewer to a space under atmospheric pressure.
- a disadvantage, however, of this known system is that when the partial vacuum is about half of the atmospheric pressure, a liquid column with a height of about five meters is required which clearly limits the application of the solution.
- An object of the invention is to improve the emptying of a vacuum sewer system and especially the emptying of such a system based on passing sewage through a liquid column.
- the invention is based on balancing the partial vacuum of the liquid column by an inertia force achieved by centrifugal force and not by gravitational force as in the known device.
- the centrifugal inertia force is achieved by rapidly rotating a discharge conduit connected to the end of the vacuum sewer system.
- the discharge conduit is suitably so configured that its inlet end is at the rotational axis of the same and its outlet end at a considerable radial distance from the rotational axis.
- the outlet end of the conduit is conveniently provided with a valve means, which opens when the inertia force of the liquid in the conduit due to the rotational movement is higher than the counter force of the partial vacuum acting on the conduit. This provides for emptying the vacuum sewer at any chosen time in a manner that does not in any way disturb the functioning of the vacuum sewer in the vacuum sewer system.
- the discharge conduit of the system according to the invention is preferably, in relation to the rotational speed given to it by a drive means, dimensioned so that the inertia force of the rotational movement at the outlet end of the conduit is about 20 to 100 times greater than the inertia force caused by local gravitation. In this way a device with a good operational reliability is achieved.
- the outlet end of the discharge conduit is advantageously at a distance of from 15 to 55 cm, preferably from 20 to 40 cm, from the rotational axis of the conduit.
- Such dimensioning allows the construction of a sufficiently small system, in which, however, the rotational speed of the conduit is reasonable, in the region of 500 r/min.
- the power source for the drive means of the discharge conduit is preferably an electric motor, the power of which is of a magnitude of 1 kW and the nominal rotational speed, when coupled to a network of 50 Hz, of which is 1500 or 3000 r/min.
- a motor gives with a rather simple power transmission, e.g. a V-belt drive, a suitable rotational speed for the discharge conduit.
- the vacuum pump of the system may receive its drive power from the same motor as the discharge conduit.
- the system can be designed so that both the vacuum pump and the discharge conduit are always used at the same time. If, however, it is desirable to avoid the discharge conduit from rotating unnecessarily, a disconnectable switch may be installed in the drive means of the discharge conduit for controlling the rotation.
- the function of the discharge conduit may also be controlled, e.g. by means of a sensing device, which prevents the rotation of the conduit and/or effects the closing of the valve means of the conduit when the amount of liquid in the conduit is below a certain limit value. Substantially the same effect is achieved if the valve means of the discharge conduit is a non-return valve and there is a spring bias effective in the closing direction of the valve, or alternatively, if the valve means of the discharge conduit is a closure valve and there are means for controlling its opening and closing movements according to the inertia force and the amount of the liquid in the conduit.
- At least the end part of the discharge conduit is "pipelike" or tubular and corresponds to the dimensioning of the vacuum sewer, i.e. has a diameter of from 45 to 60 mm, preferably from 50 to 55 mm. In this way a sufficiently large liquid volume is easily collected in the conduit for ensuring the function.
- the discharge conduit may be balanced with a counter-weight or may be designed as a double- or multi-branched conduit so that the centre point of its rotating mass is on the rotational axis or in the immediate vicinity of it.
- the discharge conduit of a vacuum sewer system functions very rapidly. Therefore it is advantageous to limit the rotation of the discharge conduit to very short periods, the length of which are preferably at the most only a few seconds, which usually is sufficient for achieving a desired discharge operation.
- the function of the limiting means may be based on measuring time or distance. In certain embodiments it may be conceived that the rotational movement does not even comprise a full turn, whereby the rotational movement also may be a back and forth, rapidly occurring swinging motion.
- reference numeral 1 designates a number (three as shown) of vacuum water closets and reference numeral 2 designates a sewer pipe connected to each of the water closets 1 and which extends to, so that its end portion opens into, a relatively small intermediate container 3. Sewage transport from each of the closets 1 is controlled by a respective, normally closed sewer valve 4. Each sewer valve 4 may be opened if a sufficiently strong partial vacuum, necessary for effectively transporting sewage, prevails in the sewer pipe 2. The partial vacuum is generated by a vacuum pump 5 driven by an electrical motor 6.
- a rotatable discharge conduit 8 in the form of a pipe is rotatable about an axis 7 and extends from the bottom part of the intermediate container 3.
- the conduit 8 receives its drive power through a belt gear 9 from a motor 6.
- a valve means 10 is arranged at an offset end of the conduit and typically comprises a stiff or spring biased non-return valve or a remote-controlled closure valve.
- the conduit 8 rotates in a container 11 having a bottom pipe 12.
- the sewage coming from the vacuum sewer system passes through the conduit 8, into the container 11 from where it is led by the pipe 12 to a desired location, e.g. a municipal sewer, a waste water purification plant or a collecting container 13.
- the device shown in the drawing operates as follows.
- the vacuum pump 5 continuously maintains a partial vacuum, within a range of an allowable upper and lover level, of about a half atmosphere in the sewer pipe 2 and in the intermediate container 3.
- a water closet 1 is emptied by opening the sewer valve 4, causing the atmospheric pressure to push the sewage in the water closet 1 into the sewer pipe 2 and through the pipe 2 into the intermediate container 3.
- the sewage from the container 3 flows to the discharge conduit 8. It is subject to the same partial vacuum as exists in the intermediate container 3 and forms a liquid column.
- a centrifugal force is generated which pushes the sewage in the conduit 8 to the end portion of the latter with a force that exceeds a counter force provided by the partial vacuum.
- part of the sewage leaves the conduit 8 through the valve means 10.
- the rotation of the conduit 8 may be stopped.
- a certain amount of liquid has to be maintained in the conduit 8 so that the liquid closes the connection to the atmosphere at the end part of the conduit. Otherwise air may flow through the conduit 8 to a space under partial vacuum. Sewage that has ended up in the container 11 through the conduit 8 flows through the bottom pipe 12 into the container 13.
- the discharge conduit may be branched, for example it may comprise a double-branched pipe 8, 8a. By employing a second branch 8a, shown by broken lines, the centre of gravity of the rotating mass moves as close as possible to the axis 7.
- the power transmission of the discharge conduit may have a remote-controlled disconnectable switch means 14.
- the rotation of the discharge conduit and/or the operation of the valve means 10 may also be automatically controlled, e.g. by a surface level sensing means 15 in the conduit 8 or the collecting container 3.
- Such surface level sensing means may include a control centre 16 which, on receiving, for example, a control signal from the sensing means 15 or other control command, starts the pump 5 and/or switches the switch means 14.
- a pressure gauge 17 is also coupled to the control centre 16 to ensure that the vacuum sewer always has a sufficiently strong partial vacuum. If the valve means 10 is a controlled non-return valve, its control device is activated by a signal given by the control centre.
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- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
- Sanitary Device For Flush Toilet (AREA)
Abstract
Description
- This invention relates to a vacuum sewer system according to the preamble of claim 1.
- A substantial problem with vacuum sewer systems is the conveyance in the sewer of sewage from a point where it is under partial vacuum to a point at atmospheric pressure. This problem has been previously solved in several ways, of which some allow continuous transport of sewage in a vacuum sewer from a space under partial vacuum and others allow only intermittent transport. GB-A-2,012,334 discloses a solution which allows continuous transport of sewage. At the end of the vacuum sewer there is a liquid column the height of which corresponds to the partial vacuum in the vacuum sewer. Sewage may continuously flow through this liquid column from the vacuum sewer to a space under atmospheric pressure. A disadvantage, however, of this known system is that when the partial vacuum is about half of the atmospheric pressure, a liquid column with a height of about five meters is required which clearly limits the application of the solution.
- An object of the invention is to improve the emptying of a vacuum sewer system and especially the emptying of such a system based on passing sewage through a liquid column. In particular it is a preferred aim to enable the complete emptying system, including the liquid column pipe, to be fitted into a relatively small space.
- According to the present invention there is provided a vacuum sewer system as claimed in the ensuing claim 1.
- The invention is based on balancing the partial vacuum of the liquid column by an inertia force achieved by centrifugal force and not by gravitational force as in the known device. The centrifugal inertia force is achieved by rapidly rotating a discharge conduit connected to the end of the vacuum sewer system.
- The discharge conduit is suitably so configured that its inlet end is at the rotational axis of the same and its outlet end at a considerable radial distance from the rotational axis. The outlet end of the conduit is conveniently provided with a valve means, which opens when the inertia force of the liquid in the conduit due to the rotational movement is higher than the counter force of the partial vacuum acting on the conduit. This provides for emptying the vacuum sewer at any chosen time in a manner that does not in any way disturb the functioning of the vacuum sewer in the vacuum sewer system.
- The discharge conduit of the system according to the invention is preferably, in relation to the rotational speed given to it by a drive means, dimensioned so that the inertia force of the rotational movement at the outlet end of the conduit is about 20 to 100 times greater than the inertia force caused by local gravitation. In this way a device with a good operational reliability is achieved.
- The outlet end of the discharge conduit is advantageously at a distance of from 15 to 55 cm, preferably from 20 to 40 cm, from the rotational axis of the conduit. Such dimensioning allows the construction of a sufficiently small system, in which, however, the rotational speed of the conduit is reasonable, in the region of 500 r/min.
- The power source for the drive means of the discharge conduit is preferably an electric motor, the power of which is of a magnitude of 1 kW and the nominal rotational speed, when coupled to a network of 50 Hz, of which is 1500 or 3000 r/min. Such a motor gives with a rather simple power transmission, e.g. a V-belt drive, a suitable rotational speed for the discharge conduit.
- The vacuum pump of the system may receive its drive power from the same motor as the discharge conduit. The system can be designed so that both the vacuum pump and the discharge conduit are always used at the same time. If, however, it is desirable to avoid the discharge conduit from rotating unnecessarily, a disconnectable switch may be installed in the drive means of the discharge conduit for controlling the rotation.
- The function of the discharge conduit may also be controlled, e.g. by means of a sensing device, which prevents the rotation of the conduit and/or effects the closing of the valve means of the conduit when the amount of liquid in the conduit is below a certain limit value. Substantially the same effect is achieved if the valve means of the discharge conduit is a non-return valve and there is a spring bias effective in the closing direction of the valve, or alternatively, if the valve means of the discharge conduit is a closure valve and there are means for controlling its opening and closing movements according to the inertia force and the amount of the liquid in the conduit.
- It is recommended that at least the end part of the discharge conduit is "pipelike" or tubular and corresponds to the dimensioning of the vacuum sewer, i.e. has a diameter of from 45 to 60 mm, preferably from 50 to 55 mm. In this way a sufficiently large liquid volume is easily collected in the conduit for ensuring the function.
- In order to minimise the vibration caused by an eccentrically rotating mass, the discharge conduit may be balanced with a counter-weight or may be designed as a double- or multi-branched conduit so that the centre point of its rotating mass is on the rotational axis or in the immediate vicinity of it.
- The discharge conduit of a vacuum sewer system according to the invention functions very rapidly. Therefore it is advantageous to limit the rotation of the discharge conduit to very short periods, the length of which are preferably at the most only a few seconds, which usually is sufficient for achieving a desired discharge operation. The function of the limiting means may be based on measuring time or distance. In certain embodiments it may be conceived that the rotational movement does not even comprise a full turn, whereby the rotational movement also may be a back and forth, rapidly occurring swinging motion.
- An embodiments of the invention will now be described, by way of example only, with particular reference to the accompanying schematic drawing, which shows a vacuum sewer system according to the invention applied to water closets.
- In the drawing reference numeral 1 designates a number (three as shown) of vacuum water closets and
reference numeral 2 designates a sewer pipe connected to each of the water closets 1 and which extends to, so that its end portion opens into, a relatively smallintermediate container 3. Sewage transport from each of the closets 1 is controlled by a respective, normally closedsewer valve 4. Eachsewer valve 4 may be opened if a sufficiently strong partial vacuum, necessary for effectively transporting sewage, prevails in thesewer pipe 2. The partial vacuum is generated by avacuum pump 5 driven by an electrical motor 6. - A rotatable discharge conduit 8 in the form of a pipe is rotatable about an
axis 7 and extends from the bottom part of theintermediate container 3. The conduit 8 receives its drive power through a belt gear 9 from a motor 6. A valve means 10 is arranged at an offset end of the conduit and typically comprises a stiff or spring biased non-return valve or a remote-controlled closure valve. The conduit 8 rotates in acontainer 11 having abottom pipe 12. The sewage coming from the vacuum sewer system passes through the conduit 8, into thecontainer 11 from where it is led by thepipe 12 to a desired location, e.g. a municipal sewer, a waste water purification plant or acollecting container 13. - The device shown in the drawing operates as follows. The
vacuum pump 5 continuously maintains a partial vacuum, within a range of an allowable upper and lover level, of about a half atmosphere in thesewer pipe 2 and in theintermediate container 3. A water closet 1 is emptied by opening thesewer valve 4, causing the atmospheric pressure to push the sewage in the water closet 1 into thesewer pipe 2 and through thepipe 2 into theintermediate container 3. The sewage from thecontainer 3 flows to the discharge conduit 8. It is subject to the same partial vacuum as exists in theintermediate container 3 and forms a liquid column. By rapidly rotating the conduit 8, a centrifugal force is generated which pushes the sewage in the conduit 8 to the end portion of the latter with a force that exceeds a counter force provided by the partial vacuum. Thus part of the sewage leaves the conduit 8 through the valve means 10. Immediately after this the rotation of the conduit 8 may be stopped. - A certain amount of liquid has to be maintained in the conduit 8 so that the liquid closes the connection to the atmosphere at the end part of the conduit. Otherwise air may flow through the conduit 8 to a space under partial vacuum. Sewage that has ended up in the
container 11 through the conduit 8 flows through thebottom pipe 12 into thecontainer 13. - The discharge conduit may be branched, for example it may comprise a double-
branched pipe 8, 8a. By employing asecond branch 8a, shown by broken lines, the centre of gravity of the rotating mass moves as close as possible to theaxis 7. The power transmission of the discharge conduit may have a remote-controlled disconnectable switch means 14. Thus thepump 5 can be used without rotating the discharge conduit. The rotation of the discharge conduit and/or the operation of the valve means 10 may also be automatically controlled, e.g. by a surface level sensing means 15 in the conduit 8 or thecollecting container 3. Such surface level sensing means may include acontrol centre 16 which, on receiving, for example, a control signal from the sensing means 15 or other control command, starts thepump 5 and/or switches the switch means 14. Apressure gauge 17 is also coupled to thecontrol centre 16 to ensure that the vacuum sewer always has a sufficiently strong partial vacuum. If the valve means 10 is a controlled non-return valve, its control device is activated by a signal given by the control centre. - The invention is not limited to the embodiments disclosed, but several variations or modifications thereof are feasible, including variations which have features equivalent to, but not necessarily within the meaning of, features in any of the appended claims.
Claims (13)
- A vacuum sewer system comprising at least one sanitary device (1), e.g. a water closet, connected through a normally closed sewer valve (4) to a collecting container (3) maintained in use under partial vacuum by means of a vacuum pump (5) or the like, characterised in that the collecting container (3) is provided with a discharge means (8-10) comprising a rapidly rotatable discharge conduit (8) arranged, on rapid rotation, to apply, on the sewage in the discharge conduit, an inertia force in opposition to the force applied by said partial vacuum for discharging sewage from the discharge conduit.
- A system according to claim 1, characterised in that the discharge conduit (8) has an inlet end at a rotation axis (7) of the discharge conduit and an outlet end at a radial distance, preferably a considerable radial distance, from the rotation axis (7) of the discharge conduit, and in that said outlet end is provided with a valve means (10).
- A system according to claim 1 or 2, characterised in that the discharge conduit (8) is so dimensioned in relation to the rotational speed given to it by a drive means (6, 9) that the inertia force of the rotational movement of the conduit is from 20 to 100 times greater than the inertia force caused by local gravitation.
- A system according to claim 3, characterised in that a switch means (14) is arranged between the drive means (6, 9) and the discharge conduit (8).
- A system according to claim 3 or 4, characterised in that the drive means of the discharge conduit (8) comprises a motor (6), preferably an electric motor.
- A system according to any one of claims 2 to 5, characterised in that the vacuum pump (5) receives its drive power from the same drive means (6) as the discharge conduit (8).
- A system according to claim 2, claim 3, 4 or 5 when dependent on claim 2, or claim 6, characterised in that the outlet end of the discharge conduit (8) is at a distance of from about 15 to 55 cm, preferably from about 20 to 40 cm, from the rotational axis (7) of the discharge conduit.
- A system according to any one of the preceding claims, characterised in that the discharge conduit (8) or the collecting container (3) is provided with means (15) arranged to prevent the rotation of the discharge conduit (8) and/or is arranged to effect the closing of the valve means (10) when the amount of liquid in the discharge conduit (8) is below a certain limit value.
- A system according to any one of claims 2, 6 or 7, or any one of claims 3, 4, 5 or 8 when dependent on claim 2, characterised in that if the valve means (10) of the discharge conduit (8) is a non-return valve there is a spring bias effective in the closing direction of the valve, or alternatively, if the valve means (10) of the discharge conduit (8) is a closure valve, there are means (15) for controlling its opening and closing movements according to the inertia force of the liquid in the discharge conduit.
- A system according to claim 9, characterised in that the non-return valve is provided with a control device.
- A system according to any one of the preceding claims, characterised in that at least an outlet end portion of the discharge conduit (8) is substantially circular cylindrical having a diameter of from 45 to 60 mm, preferably from 50 to 55 mm.
- A system according to any one of the preceding claims, characterised in that discharge conduit (8, 8a) is double- or multi-branched so that the centre point of its rotating mass is on or close to a rotational axis (7) of the conduit.
- A system according to any one of claims 2, 7, 9 or 10 or any one of claims 3 to 6, 8, 11 or 12 each when dependent on claim 2, characterised in that the drive means (6, 14, 9) of the discharge conduit (8) comprises means (14) for limiting the rotation of the discharge conduit to periods of short length, preferably of only a few seconds.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI990111 | 1999-01-20 | ||
FI990111A FI105223B (en) | 1999-01-20 | 1999-01-20 | Vacuum drainage system drain device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1022399A1 true EP1022399A1 (en) | 2000-07-26 |
Family
ID=8553440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00300093A Withdrawn EP1022399A1 (en) | 1999-01-20 | 2000-01-07 | Emptying device for vacuum sewer system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1022399A1 (en) |
JP (1) | JP2000213055A (en) |
KR (1) | KR20000076479A (en) |
CN (1) | CN1261120A (en) |
FI (1) | FI105223B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002059432A1 (en) | 2001-01-26 | 2002-08-01 | Geberit Technik Ag | Toilet system with a toilet pan |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100370083C (en) * | 2005-08-04 | 2008-02-20 | 曹保琪 | Vacuum closet system |
FI118231B (en) * | 2006-01-30 | 2007-08-31 | Evac Int Oy | vacuum Drainage |
JP4949731B2 (en) * | 2006-04-28 | 2012-06-13 | 株式会社テシカ | Sewage treatment equipment for vehicles |
CN101962970B (en) * | 2010-10-09 | 2012-05-23 | 清华大学 | Water collecting interface unit device of vacuum drainage system |
US8490223B2 (en) | 2011-08-16 | 2013-07-23 | Flow Control LLC | Toilet with ball valve mechanism and secondary aerobic chamber |
KR101464481B1 (en) * | 2013-10-22 | 2014-11-27 | 주식회사 호두 | Auto discharge equipment of vacuum toilet system |
JP6214391B2 (en) * | 2013-12-26 | 2017-10-18 | アロン化成株式会社 | Negative pressure suction toilet |
JP2023038934A (en) * | 2021-09-07 | 2023-03-17 | 淳 中家 | toilet unit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2012334A (en) | 1977-12-14 | 1979-07-25 | Electrolux Ab | Method and apparatus for conveying waste water by means of a vacuum |
WO1997017502A1 (en) * | 1995-11-07 | 1997-05-15 | Fiberite, Inc. | Waste tank for vacuum sewage system |
-
1999
- 1999-01-20 FI FI990111A patent/FI105223B/en active
-
2000
- 2000-01-07 EP EP00300093A patent/EP1022399A1/en not_active Withdrawn
- 2000-01-18 KR KR1020000002102A patent/KR20000076479A/en not_active Application Discontinuation
- 2000-01-19 JP JP2000009678A patent/JP2000213055A/en active Pending
- 2000-01-20 CN CN00101138A patent/CN1261120A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2012334A (en) | 1977-12-14 | 1979-07-25 | Electrolux Ab | Method and apparatus for conveying waste water by means of a vacuum |
WO1997017502A1 (en) * | 1995-11-07 | 1997-05-15 | Fiberite, Inc. | Waste tank for vacuum sewage system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002059432A1 (en) | 2001-01-26 | 2002-08-01 | Geberit Technik Ag | Toilet system with a toilet pan |
US6910231B2 (en) | 2001-01-26 | 2005-06-28 | Geberit Technik Ag | Toilet system with a toilet pan |
Also Published As
Publication number | Publication date |
---|---|
KR20000076479A (en) | 2000-12-26 |
FI990111A0 (en) | 1999-01-20 |
JP2000213055A (en) | 2000-08-02 |
CN1261120A (en) | 2000-07-26 |
FI105223B (en) | 2000-06-30 |
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