FR2624150A1 - DISCONNECTOR DEVICE PREVENTING THE SIPHONING OF A WC TOILET TO THE WATER SUPPLY NETWORK - Google Patents

Abstract

This is a siphon breaker backflow preventer 13 for water supply from a pressure network of a toilet bowl It has a cavity 18 provided with a removable cover 16, partially hollowed out, which defines a chamber 15 supplied by a supply duct 14 and opening upstream of an injector orifice 21 arranged in the upper part 20 of said cavity 18. The cavity 18 is vented through the outlet of a chute 22 open onto the cavity 18 at a distance from the outlet of the injector orifice 21, said chute extending outwardly with respect to the wall of the cavity 18 in a direction slightly inclined upwards.

Description

The present invention relates to disconnec-

  torers, or disconnection devices, for supplying water to a reservoir from a pressure network comprising a first supply conduit suitable for being connected on one side to the network and opening on the other side, through an orifice of smaller section than the section of said conduit, in the upper part of a cavity, provided with a vent disposed downstream of the orifice of smaller section and a second evacuation conduit towards the reservoir, connecting by gravity

said cavity to said reservoir.

  It finds a particularly important, although not exclusive, application in the field of WC grinders using a direct water supply.

from the public network.

  We already know siphon backflow preventers

  for water supply like the one defined above.

  In particular, there is a backflow preventer suitable for equipping WC grinders, formed by bonding two symmetrical elements, for example obtained by molding or by injection of a plastic material into a mold. This solution presents

many disadvantages.

  It happens that the two elements glued to each other separate, the disconnector ns'opening "under the pressure of the network. Such a disconnector also generates numerous splashes and projections of water via the This humidity can cause short circuits in nearby electrical devices, as is the case for a grinder toilet, the volume of which must remain very compact. , the orifice of smaller section becomes blocked due to the accumulation of scale or lime and makes the backflow preventer unusable. The user will, if he wants to continue to operate his toilets, be tempted to bypassing the blocked backflow preventer This has safety drawbacks, since this backflow preventer is precisely installed in order to avoid siphoning out of a blocked toilet bowl into the risky public network

cause contamination.

  The invention aims to provide a trap-siphon backflow preventer allowing water to be supplied from a pressure network of a W.C. Bowl, with a view to rinsing said bowl, responding better than those previously known. to the requirements of the practice and allowing a greater safety in the exploitation, in particular in that it authorizes: - an easy access to the orifice of smaller section than the section of the water supply duct, which allows its uncorking; the user is therefore not tempted to bypass the backflow preventer when it is plugged, - better leaktightness of the backflow preventer, projections of water droplets through the vent during a passage of water through the backflow preventer towards the bowl

being eliminated.

  To this end, the invention proposes in particular a siphon backflow preventer for supplying water from a pressure network, from a toilet bowl, for rinsing said bowl, comprising: a first supply duct suitable for being connected on one side to the network and opening on the other side, through an injector orifice of smaller section than the section of said duct, in the upper part of a cavity provided with a vent, said vent being placed downstream of said orifice, and a second discharge conduit towards the bowl, gravitatively connecting said cavity to said bowl, characterized in that said cavity comprises a removable cover partially hollowed out and defining

  a chamber supplied by the first conduit and opening

  edge upstream of said injector orifice and, in that the vent of said cavity is constituted by the outlet of a trough open on the cavity at a first distance from the outlet of said injector orifice, said trough extending externally relative to the wall of said cavity in one direction

  slightly tilted upwards.

  In advantageous embodiments, we have

  in addition to one and / or the other of the provisions

  following: - the upper part of the cavity in which the injector orifice is pierced axially comprises a tubular skirt, said skirt extending relative to the outlet of said injector orifice over a distance at least equal to said first distance defined for the chute, - the skirt is pierced with at least one small diameter hole near the injector orifice, - the upper part of the cavity has a removable part in which the injector orifice is pierced, said part being fixedly held between the cover provided with a seal and said cavity when said cover is fixed on said cavity, the injector orifice is in the form of a nozzle suitable for promoting air entrainment in the cavity via the chute during a supply of water to the backflow preventer, - the upward angle formed by the direction of the chute and a plane transversely perpendicular to the cavity is between 2 and 20 ', advantageously of the order of 5', - the backflow preventer is constituted é in matter

plastic by molding.

  The invention will be better understood on reading

  the following description of a particular mode of

  embodiment, given by way of nonlimiting example. The

  description refers to the accompanying drawings

  in which: - Figure 1 is a schematic side view of a grinder toilet comprising a backflow preventer according to the invention, - Figure 2 is a sectional view of a backflow preventer according to the invention, - the Figure 3 is a sectional view of a variant of a backflow preventer according to the invention, connected

to a full bowl.

  The grinder toilet 1 includes a device 2

  allowing rinsing of the toilet bowl 3, the vacuum cleaner

  ration, the grinding and expulsion of effluents being

  carried out by means located in the lower part of the toilet

  1. The water supply 4 coming from the pressure network (a few bars) is done by means of a metering tap 5. This metering tap alone replaces a conventional tank and its mechanism. The bowl 3 has an anti-odor valve 6 with automatic return, suitable for opening to let water and faeces flow into the lower tank 7 of

  reception of effluents. The valve closes automatically.

  only. As the tank 7 is filled, the float 8 lifts. When the electrical contact

  9 is obtained, the multifunction pump 10 starts. Simul-

  temporarily it grinds, sucks and sends in a canali-

  sation 12 effluents 11. Line 12 is connected to the wastewater collection pipes (not shown). The metering tap 5 is connected to the

  bowl 3 via the backflow preventer 13.

  As mentioned in FIGS. 2 and 3, the backflow preventer 13 comprises a first supply duct 14 which is therefore connected on one side to the network via the metering tap 5 and which opens on the other side into a chamber 15 formed in the cover 16. The cover 16 can be fixed in a removable manner by fixing means 17, constituted for example by nuts and bolts, on the cavity 18. This cavity is of revolution about an axis 19 and has a high part 20. The upper part 20 is pierced with an injector orifice 21 of smaller diameter than the diameter of the duct 14. The cavity 18 comprises a vent 22 constituted by a chute open on the cavity to

  a first distance d from the outlet 23 of the orifice 21.

  It extends externally with respect to the wall 24 of said cavity over a determined length, for example 3 mm, and in a direction 25 forming an angle a, for example 3 ′, with a plane perpendicular 26 to the axis 19 of the cavity. The determined length is advantageously of the order of the dimension of the radius of the section

equivalent of the chute.

  The upper part 20 of the cavity 18 comprises a tubular skirt 27 coaxial with the injector orifice 21 so that the water leaving said orifice, when the

  backflow preventer is supplied by the network, is channeled.

  The skirt 27 extends over a distance from the outlet 23 from the orifice 21 at least equal to the first distance defined for the chute. This distance is for example of the order of 1.5 cm. The skirt 27 may advantageously include holes 28 of small diameter which favor the formation of an air-water emulsion in

the cavity.

  In FIG. 2, the upper part 20 of the cavity comprises a removable part 30 in which the injector orifice 21 is pierced. The part is fixedly held between the cover 16 and the cavity 18 by the fixing means 17. A seal 31 ensures the tightness of the attachment of the removable cover. The orifice 21 is in the form of a slightly conical nozzle with a diameter narrowing downwards and penetrating 1 or 2 mm into the tubular skirt so as to allow acceleration

  pressurized liquid arriving through line 14.

  The resulting jet promotes the entrainment of air into the cavity via the chute during the passage of water to the toilet bowl 3. The cavity 18 is profiled in the lower part in a frustoconical manner to favor the flows. The backflow preventer 13 furthermore comprises a conduit 32 for evacuating water to the bowl, connected by gravity to the cavity 18. This conduit can be part of the same part as the cavity 13 (as shown in FIG. 3), or be formed by a removable rubber tube for example (as shown on the

  figure 2). The conduit 32 is connected to the toilet bowl.

  3 by connection means 33 known per se.

  The backflow preventer 13 can be formed in one piece including the supply duct 14, the cavity 18 and the discharge duct 32, only the cover 16 being separable from the rest of the backflow preventer (see FIG. 3) or be formed by separable parts one from the other, as are the cover 16, the seal 31, the part 30, the cavity 18 and the discharge duct 32 of the backflow preventer of the type shown in FIG. 2. Fastening means 34 of the backflow preventer on the structure of the grinder 1 can be provided. The constituent parts of the backflow preventer are advantageously made of thermoplastic material. The various methods of using thermoplastics, in particular injection molding, extrusion, blow molding, rotational molding or melt casting, can be used and allow the necessary parts to be easily manufactured with the

shapes we want.

  The operation of a toilet will be described below.

  compact mill comprising a backflow preventer according to

the invention.

  The user who wants to clean a toilet bowl activates the toilet emptying mechanism by

  single press on push-button 35. The power supply

  tion 4 in cold water is then carried out with a regulated pressure, for example 3.5 bars by the metering tap 5 which sends under pressure the equivalent of a few liters of water to the backflow preventer 13. The water enters through the conduit 14 in the chamber 15 and is injected through the injector orifice 21 into the cavity 18 by entraining air via the chute 22, which produces an air-liquid emulsion. The emulsion flows with a certain pressure (lower than the initial pressure entering the backflow preventer but nevertheless sufficient to allow effective rinsing) in the conduit 32 then enters under pressure into the bowl, the walls of which are then rinsed vigorously with a circular motion. In normal use, under the weight of the water, the anti-odor valve 6 with automatic return will open to let the effluents flow into the tank

lower 7.

  In accidental regime, either because the valve does not open, or because the tank 7 has not been emptied by the motor means 10, there may be an overshoot of the level of the nozzle 32 on the bowl 3 by the efluents present in the bowl 3. In the extreme case, the level can even reach its maximum 36 (as shown in FIG. 3) and cause the bowl to overflow. In the absence of a siphon backflow preventer, there would be a risk of siphoning of said

bowl 3 to the network.

  As seen in Figure 3, the discrepancy

  nector, allowing air to enter the high point it constitutes, thus avoiding the formation of a siphon and any contamination of the return network. The reliability and ease of unclogging the backflow preventer of the invention thus guarantee flawless use and

  complete safety, with regard to hygiene, of the toilet

  As goes without saying and as it already follows from the above, the invention is in no way limited to those of these modes of application and embodiments which have been more especially envisaged;

  on the contrary, it embraces all its variants.

Claims (8)

CLAIMS:   1. Backflow preventer (13) for water supply from a pressure network, from a toilet bowl (3), for rinsing said bowl, comprising: a first conduit ( 14) supply suitable for being connected on one side to the network and opening on the other side, through an injector orifice (21) of smaller section than the section of said conduit, in the upper part (20) d '' a cavity (18) provided with a vent (22), said vent being placed downstream of said orifice, and a second conduit (32) for evacuation towards the bowl, gravitatively connecting said cavity to said bowl, characterized in that said cavity (18) comprises a removable cover (16) partially hollowed out and defining a chamber (15) supplied by the first conduit and opening upstream of said injector orifice and, in that the vent (22) of said cavity is constituted by the outlet of a trough open on the cavity at a first distance from the outlet of said injector orifice, said trough extends ant externally with respect to the wall of said cavity   in a slightly tilted upward direction.   2. Backflow preventer according to claim 1, characterized in that the upper part (20) of the cavity in which the injector orifice is pierced axially comprises a tubular skirt (27), said skirt extending relative to the outlet of said orifice injector over a distance at least equal to said first distance defined for the chute.   3. Backflow preventer according to claim 2, characterized in that the skirt (27) is pierced with at least one hole (28) of small diameter near the injector orifice. 4. Backflow preventer according to any one of   previous claims, characterized in that said   upper part (20) of the cavity (18) comprises a removable part (30) in which the injector orifice (21) is pierced, said part being fixedly held between the cover (16) provided with a seal (31) and said cavity (18) when said cover is fixed on said cavity. 5. Backflow preventer according to any one of   previous claims, characterized in that   the injector orifice (21) is in the form of a nozzle suitable for promoting air entrainment in the cavity via the   chute during a disconnected water supply   tor. 6. Backflow preventer according to any one of   previous claims, characterized in that   the upward angle (x) formed by the direction of the chute and a plane (26) transversely perpendicular to the cavity is between 2 and 20 ′, advantageously of the order of 5 '.   7. Backflow preventer according to any one of   previous claims, characterized in that it is   made of plastic by molding.   8. Application of said connector according to one   any of the preceding claims to a toilet grinder.