EP3133216A1 - A backflow prevention system for a toilet flushing system - Google Patents

A backflow prevention system for a toilet flushing system Download PDF

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Publication number
EP3133216A1
EP3133216A1 EP16184614.2A EP16184614A EP3133216A1 EP 3133216 A1 EP3133216 A1 EP 3133216A1 EP 16184614 A EP16184614 A EP 16184614A EP 3133216 A1 EP3133216 A1 EP 3133216A1
Authority
EP
European Patent Office
Prior art keywords
water
flushing
backflow prevention
valve
bowl
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.)
Pending
Application number
EP16184614.2A
Other languages
German (de)
English (en)
French (fr)
Inventor
Erik Albertsen
Simon Billinge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Geberit International AG
Original Assignee
Geberit International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Geberit International AG filed Critical Geberit International AG
Priority to EP16184614.2A priority Critical patent/EP3133216A1/en
Publication of EP3133216A1 publication Critical patent/EP3133216A1/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
    • E03D5/01—Special constructions of flushing devices, e.g. closed flushing system using flushing pumps
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D3/00—Flushing devices operated by pressure of the water supply system flushing valves not connected to the water-supply main, also if air is blown in the water seal for a quick flushing
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03D—WATER-CLOSETS OR URINALS WITH FLUSHING DEVICES; FLUSHING VALVES THEREFOR
    • E03D5/00—Special constructions of flushing devices, e.g. closed flushing system
    • E03D5/10—Special constructions of flushing devices, e.g. closed flushing system operated electrically, e.g. by a photo-cell; also combined with devices for opening or closing shutters in the bowl outlet and/or with devices for raising/or lowering seat and cover and/or for swiveling the bowl

Definitions

  • the present invention relates to a flushing system for a toilet. More particularly, the present invention relates to a non-gravity flushing system reducing the risk of contamination of the supply water.
  • the flushing system may e.g. be designed to allow flushing water to enter the bowl by gravity, which may be provided by arranging a flushing cistern at a level vertically above an inlet valve to the WC bowl, thus located below the level of the flushing cistern.
  • the flushing cistern contains a certain volume of water used for flushing, whereby the flushing cistern is at least partly discharged upon flushing.
  • the flushing cistern may be arranged inside a hollow body formed integrally with the WC bowl.
  • flushing cistern may instead be provided inside the wall adjacent to the WC bowl.
  • flushing cistern For this purpose another type of flush systems has been developed, having a flushing cistern arranged at approximately the same level as the WC bowl.
  • a pressurized system within the flushing cistern may be utilized.
  • An electrical pump or compressor, or any other energy storing device, may thus provide pressurized water which may be discharged to the WC bowl without the need of gravitational force.
  • the present invention preferably seeks to mitigate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems by providing a flushing system with two individual backflow prevention devices.
  • An idea of the present invention is therefore to provide a backflow prevention arrangement for a flushing system in which at least a part of the water in the flushing cistern used for flushing is arranged below the vertical level of the inlet to the WC bowl.
  • a further idea of the present invention is to provide a backflow prevention arrangement for a flushing system, which backflow prevention arrangement ensures that water from the WC bowl may never escape to the main water supply.
  • a non-gravity flushing system comprising a water inlet valve for allowing pressurized supply water to enter said flushing system being arranged in direct fluid communication with said water inlet valve, wherein said flushing system is configured to discharge a flow of flushing water through an outlet port into a water inlet of a WC bowl when a flush is initiated.
  • the system is characterized by a first backflow prevention device arranged downstream of the water inlet valve, and a second backflow prevention device arranged downstream of said first backflow prevention device and upstream of the water inlet of said WC bowl.
  • the flushing system may further comprise a flushing cistern for storing flushing water, wherein at least a part of the stored water can be arranged vertically below the water inlet to the WC bowl.
  • Said flushing cistern may also comprise a tank for storing flushing water.
  • the tank may be capable of storing pressurized flushing water and to discharge said flushing water into the WC bowl.
  • the flushing system may be capable of discharging the flushing water stored in said flushing cistern by means of an ejector.
  • the ejector may receive a water flow for drawing the water from the flushing cistern, and the water flow may be provided by the tank or by the pressurized supply water.
  • the tank may be arranged inside said flushing cistern, and said flushing cistern may store non-pressurized flushing water.
  • the first backflow prevention device may be a backflow prevention valve, and an inlet end of the backflow prevention valve may be directly connected to an outlet end of the water inlet valve. Further, the backflow prevention valve may be arranged at a predetermined distance above a maximum water level in the flushing cistern. The predetermined distance may preferably be at least 20 mm.
  • the first backflow prevention valve may comprise a first check valve, a second check valve, and an intermediate chamber connecting said first check valve to said second check valve, wherein said intermediate chamber comprises a drain outlet.
  • the second backflow prevention device may form an air gap between said outlet port and a water inlet of the WC bowl.
  • the air gap may have a vertical extension of at least 20 mm.
  • a non-gravity toilet comprising a flushing system according to the first aspect.
  • a non-gravity toilet should in this context be interpreted to cover all toilets which do not require a gravity action on the flushing water in order to discharge it into the toilet bowl.
  • a non-gravity toilet includes pressurized flushing systems of which at least some of the stored flushing water can be arranged at a vertical level below the inlet to the toilet bowl.
  • a toilet 10 is connected to a flushing system 100.
  • the flushing system 100 is connected to a water supply conduit 102 for providing flushing water via a shut-off valve 104.
  • a filter 106 is provided downstream of the shut-off valve 104.
  • An inlet valve 108 is arranged downstream of the filter 106 for controlling the amount of water entering the flushing system 100. Water flowing out from the inlet valve 108 will eventually enter a flushing cistern 110, which is capable of storing water between flushes.
  • a float 109 arranged inside the flushing cistern 110 provides a purely mechanical control of the operation of the inlet valve 108. That is, the inlet valve 108 is configured to open when the float 109 is in a downward position corresponding to a lower water level in the flushing cistern 110. Consequently, when the water level inside the flushing cistern 110 reaches a predetermined upper limit (as indicated by the dashed line L1), a mechanical link between the float 109 and the inlet valve 108 will cause the inlet valve 108 to close, thus preventing additional water to enter the flushing cistern 110.
  • a predetermined upper limit indicated by the dashed line L1
  • the inlet valve 108 may in some embodiments be replaced by an electronic valve, having electronic sensors for controlling the open/close mechanism of the inlet valve.
  • Other valves either mechanical or electrical, utilizing various control systems for opening and closing of the valve, may also be provided.
  • a tank 200 is arranged inside the flushing cistern 110, and has an inlet port 202 directly connected to the water supply.
  • the tank 200 may for some embodiments be a pressure tank such that it is capable of storing a specific volume of water at an increased pressure.
  • the tank may also be a part of a mechanical or electrical pump or compressor, or any other means suitable for providing a flow of flushing water.
  • the tank 200 may also be a tank storing water at ambient pressure, whereby a spring loaded piston is capable of discharging water out from the tank upon flushing.
  • Such tank is e.g. described in the co-pending application SE1250132-6 by the same applicant.
  • an outlet valve 206 opens whereby the stored water drains out from the tank 200.
  • the drained water thus flows through a conduit 300 which ends at an outlet port 302.
  • the outlet port 302 is arranged such that the water, exiting through the outlet port 302, is allowed to enter the WC bowl 10 for providing a flush.
  • the conduit 300 comprises an ejector 304 arranged in close proximity to the outlet valve 206 of the tank 200. Hence, when the tank 200 discharges water out from the outlet valve 206, the water will enter the ejector 304.
  • the ejector 304 will thus draw water from the flushing cistern 110 (thus acting as a slave tank) such that water from the tank 200 as well as from the flushing cistern 110 will flow through the conduit 300 and thus will enter the WC bowl 10.
  • the ejector may however be omitted for flushing systems of which the tank is capable of providing enough water to perform a flush, e.g. by means of a pump, a large tank, etc.
  • a flushing mechanism 400 is further provided in order to activate a flushing sequence.
  • the flushing mechanism 400 is preferably provided outside the flushing cistern 200 such that it is maneuverable by a user.
  • flush buttons 402 are provided for initiating the flush sequence, whereby a first flush button 402a may provide a large flush while a second flush button 402b may provide a small flush.
  • a lever mechanism 404 is further provided for connecting the flushing mechanism 400 with the pressure tank 200. Hence, when the flushing mechanism 400 is activated by a user pressing any of the flush buttons 402a, 402b, the lever mechanism 404 will cause the tank 200 to open whereby flushing water is allowed to flow to the WC bowl 10.
  • the mechanical flushing mechanism may in some embodiments be replaced by an electrical flushing mechanism, responsive to a user and electrically connected to a flush initiation device.
  • the described flushing system (including the toilet) may be divided into three different zones.
  • the water quality is so called Category 1 water. This category may simply be described as high quality drinking water without any bacterial contamination being harmful for humans.
  • the water is so called Category 3 water. This category may simply be described as high quality water, however not suitable for drinking, but without any harmful bacteria.
  • the water quality is so called Category 5 water. This category may simply be described as low quality water not suitable for drinking, and possibly containing harmful bacteria.
  • the first backflow prevention device 150 is preferably a device with different pressure zones and an intermediate zone, vented to the atmosphere.
  • the upstream zone and the downstream zone, provided on each side of the intermediate zone, are forming different non-controllable pressure zones for the incoming water.
  • the first backflow prevention device 150 is directly connected to the inlet valve 108 such that the intrinsic pressure of the water supply is maintained within the backflow prevention device 150.
  • the first backflow prevention device 150 is preferably arranged between the inlet valve 108 and the tank 200, and located at a predetermined distance vertically above the maximum water level, indicated by the dashed line L2, in the flushing cistern 110. More preferably, the vertical distance between the maximum water level L2 and a vent hole of the first backflow prevention device 150 is ⁇ 20mm.This is advantageous in that contaminated water in the flushing cistern 110 may never escape into the backflow prevention device 150. Further, it is preferred to maintain the intrinsic pressure of the water supply within the backflow prevention device 150 in order to use that pressure for loading the tank 200 with water.
  • a second backflow prevention device 350 is arranged at the outlet port 302 of the flushing system 100.
  • the second backflow prevention device 350 is preferably an air gap formed by a vertical distance between the outlet port 302 and an inlet port 11 of the WC bowl 10.
  • the vertical extension of the air gap is preferably ⁇ 20mm in order to securely prevent bacteria and other contamination to spread into the conduit 300.
  • the outlet port 302 may be inserted into an outer housing, which at its lower end is connected to the inlet port 11 of the WC bowl.
  • the outer housing may preferably be in fluid connection with an overflow 111 of the flushing cistern 110, which overflow 111 has a purpose of draining excess water from the flushing cistern 110 into the WC bowl 10 in cases where the inlet valve 108 is not working properly.
  • the vertical distance between the overflow 111 and the inlet port 11 of the WC bowl is ⁇ 20mm.
  • FIG. 2 another embodiment of a flushing system 100' is shown.
  • This embodiment differs from the embodiment of Fig. 1 in that two individual tanks 200a, 200b are provided within the flushing cistern 110.
  • Each tank 200a, 200b is directly connected to the water supply conduit 102 via a shut-off valve 104, a filter 106, an inlet valve 108 and a backflow prevention device 150.
  • a shut-off valve 104 a filter 106
  • an inlet valve 108 an inlet valve 108
  • a backflow prevention device 150 may be omitted depending on the particular application and installation requirements.
  • the water conduit is divided such that each inlet port 202a, 202b receives water simultaneously.
  • each outlet valve 206a, 206b is allowing water to be drawn from the flushing cistern 110 during a flush.
  • the conduits 300a, 300b guiding the flushing water to the WC bowl 10 are preferably joined at a common outlet port 302, however two outlet ports may also be provided. Alternatively, the two conduits 300a, 300b may be joined upstream of the outlet port 302.
  • Having two individual tanks is advantageous in many ways. For example, since the space inside the flushing cistern is extremely limited, it may be advantageous to arrange an increased number of tanks as each one of the tanks may be fitted in flushing cistern areas not otherwise being able to accommodate a single larger tank.
  • a tank 200 forms the entire flushing cistern.
  • a further vessel may be provided to house the tank 200 for preventing leakage, however as the tank 200 is sealed tightly against the environment such additional vessel should not be necessary.
  • the tank 200 is capable of storing water from the supply at an elevated pressure, such that the pressurized water may be discharged into the WC bowl.
  • the tank 200 stores water at ambient pressure but includes a water pump for providing a flow.
  • the flushing cistern 110 stores water such that at least a part of the stored water is arranged vertically below the WC bowl inlet 11.
  • the flushing mechanism 400 In order to discharge the water of the flushing cistern 110 into the WC bowl, the flushing mechanism 400 is connected to a valve 220 arranged between the first backflow prevention device 150 and an ejector 304.
  • the valve 220 opens pressurized water from the main water supply 102 will flow into the ejector 304, thus drawing the water from the flushing cistern 110 into the WC bowl 10.
  • the inlet valve 108 must of course also open in order to allow water to flow into the ejector 304.
  • Fig. 5 an additional embodiment of a flushing system 100 is shown.
  • the flushing mechanism 400 is directly connected to the inlet valve 108, which provides a direct flow of water to enter the WC bowl when a flush is initiated.
  • the conduit 103 guiding water from the first backflow prevention device 150 to the outlet port 302 may have a larger diameter, either constant or increasing over its length. Hence, an increased flow may be achieved for performing the flush.
  • the inlet valve 108 may in this particular embodiment be a direct acting flushing valve, controlled by the flushing mechanism 400.
  • flushing system 100 shown in Fig. 5 may be modified such that the first backflow prevention device 150 is omitted, whereby the direct acting flushing valve 108 provides a water flow in direct communication with the second backflow prevention device 350.
  • the flushing cistern 110 encloses the water conduit 300 which serves to supply flushing water from the cistern 110, as well as from the tank(s) (not shown) to the WC bowl. Due to the location of the flushing cistern 110, i.e. at a vertical level such that flushing water is at least partly arranged below the vertical level of the inlet port 11, the conduit 300 needs to extend vertically upwards.
  • the conduit 300 ends at the outlet 302 which forms a part of the backflow prevention device 350 together with the inlet port 11 of the WC bowl. As can be seen in Figs.
  • the first backflow prevention device 150 is a backflow prevention valve being operated by the intrinsic pressure of the water supply.
  • the minimum upstream pressure at which the valve will operate is preferably set to approximately 0,5 Bar for complying with current standards.
  • the minimum upstream pressure at which the valve opens is preferably set according to the specific requirements of the particular installation site.
  • the minimum upstream pressure at which the valve opens may be between 0,2 and 2 Bar, such as 0,5, 0,75, or 1 Bar.
  • the backflow prevention valve 150 comprises an inlet 152 forming a part of a first check valve 156, and an outlet 164 forming a part of a second check valve 166.
  • the first check valve 156 and the second check valve 166 are connected by means of an intermediate chamber 176 having a drain outlet 178 for discharging leaking water into the flushing cistern 110.
  • the backflow prevention valve is preferably arranged above the flushing cistern 110. More preferably, the backflow prevention valve 150 is arranged at a minimum distance of 20 mm above the maximum water level L2 of the flushing cistern 110, such that water from the flushing cistern 110 may never escape into the backflow prevention valve 150.
  • FIG. 7a an exploded view is shown.
  • An inlet body 152 is connected to the water supply conduit for receiving pressurized water.
  • a poppet 154 is inserted inside the inlet body 152 .
  • the poppet 154 houses an insert, or check valve 156 which is further enclosed within a spring biased piston 158.
  • the spring 160 acting on the piston 158, rests on a flat rubber sealing 162 arranged within an outlet body 164.
  • a second insert, or check valve 166 is provided inside the outlet body 164.
  • the first check valve 156 is sealed against the interior surface of the piston 158 by means of an o-ring.
  • the second check valve 166 is sealed against the interior surface of the outlet body 164 by means of another o-ring.
  • the outlet body 164 is further connected to a conduit serving to guide inlet water to the pressure tanks previously described.
  • the inlet body 152 and the outlet body 164 may be connected to its corresponding conduit by means of threads, or by a snap lock connection for facilitating replacement of the valve 150.
  • the backflow prevention valve 150 is shown in a closed position, i.e. when there is no water flowing towards the inlet body 152 (or water flowing at a pressure below the cracking pressure).
  • the piston 158 will be forced towards the inlet body 152 by the spring 160 and a lip 168 of the first check valve 156 is pressed towards a socket 170.
  • the piston 158 When water is flowing into the valve 150 at a pressure above the cracking pressure, preferably between 0,5 and 10 Bar, the piston 158 will be sealed against the flat rubber sealing 162 and the check valve 156 will open, as is shown in Fig. 7c . This is accomplished since the force required to compress the spring 160 is lower than the force required to allow water to flow through a first check valve 156, Hence, water is allowed to flow through the check valve 156 into a closed conduit formed between the check valves 156, 166 by means of the position of the piston 158.
  • the second check valve 166 is similar to the first check valve, whereby the water pressure will provide a small slit between a lip 172 and a socket 174 of the second check valve 166. Water is thus allowed to exit the backflow prevention valve 150.
  • the backflow prevention valve 150 is preferably arranged above the flushing cistern, such that any leakage of the backflow prevention valve 150 will result in a water flow into the flushing cistern. This is advantageous in that no damage of surrounding equipment will occur.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Sanitary Device For Flush Toilet (AREA)
EP16184614.2A 2013-01-18 2013-01-18 A backflow prevention system for a toilet flushing system Pending EP3133216A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16184614.2A EP3133216A1 (en) 2013-01-18 2013-01-18 A backflow prevention system for a toilet flushing system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16184614.2A EP3133216A1 (en) 2013-01-18 2013-01-18 A backflow prevention system for a toilet flushing system
EP13151854.0A EP2757204B1 (en) 2013-01-18 2013-01-18 Non-gravity toilet

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP13151854.0A Division EP2757204B1 (en) 2013-01-18 2013-01-18 Non-gravity toilet
EP13151854.0A Division-Into EP2757204B1 (en) 2013-01-18 2013-01-18 Non-gravity toilet

Publications (1)

Publication Number Publication Date
EP3133216A1 true EP3133216A1 (en) 2017-02-22

Family

ID=47561442

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16184614.2A Pending EP3133216A1 (en) 2013-01-18 2013-01-18 A backflow prevention system for a toilet flushing system
EP13151854.0A Active EP2757204B1 (en) 2013-01-18 2013-01-18 Non-gravity toilet

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13151854.0A Active EP2757204B1 (en) 2013-01-18 2013-01-18 Non-gravity toilet

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EP (2) EP3133216A1 (da)
DK (1) DK2757204T3 (da)
ES (1) ES2830042T3 (da)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396744B2 (en) 2017-11-15 2022-07-26 Panasonic Intellectual Property Management Co., Ltd. Flush toilet
US10968615B2 (en) * 2018-11-10 2021-04-06 Norman Usher Toilet flushing apparatus and system and method
ES2922153A1 (es) * 2021-02-25 2022-09-09 Roca Sanitario Sa Inodoro
EP4298286A1 (en) * 2021-02-25 2024-01-03 Roca Sanitario, S. A. Toilet
CN113288784B (zh) * 2021-06-11 2023-03-31 中国人民解放军陆军军医大学第一附属医院 泪道冲洗收水装置
WO2024025483A1 (en) * 2022-07-26 2024-02-01 Iz Yapi Malzeme Ve Ekipmanlari Sanayi Ve Ticaret Anonim Sirketi A compact flow regulating assembly for a water closet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598198A1 (fr) * 1986-05-02 1987-11-06 Fact Anal Dispositif a action temporisee commandee par fluide.
EP2161380A1 (en) * 2007-06-28 2010-03-10 Toto Ltd. Flush toilet

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995328A (en) * 1974-12-13 1976-12-07 The Boeing Company Vacuum toilet system
GB2248858B (en) * 1990-10-17 1994-04-27 Metra Oy Ab Vacuum toilet system with treated rinse liquid

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598198A1 (fr) * 1986-05-02 1987-11-06 Fact Anal Dispositif a action temporisee commandee par fluide.
EP2161380A1 (en) * 2007-06-28 2010-03-10 Toto Ltd. Flush toilet

Also Published As

Publication number Publication date
EP2757204A1 (en) 2014-07-23
ES2830042T3 (es) 2021-06-02
EP2757204B1 (en) 2020-08-19
DK2757204T3 (da) 2020-11-23

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