SIPHON FOR WATER DISTRIBUTION SYSTEM

Abstract

Siphon, in particular for flushing toilets, comprising an inner cylinder placed inside an outer cylinder, and:- comprising a connector ensuring a connection between the outer cylinder and the inner cylinder;the outer cylinder, the inner cylinder and a part of the connector thus delimiting an ascending water pipe and so that the inner cylinder and a part of the connector thus delimiting a descending water pipe, - the outer cylinder having a lower end connected to a tank and an upper end connected to the connector, - the inner cylinder having a flared upper end widening upwards and a lower end connected to a water evacuation pipe towards a bowl, - the siphon having a shutter projecting into the inner cylinder at its upper end and partially closing it, reducing the volume that can be occupied by air between two primings of the siphon. Figure for the abstract: [Fig 2];

Description

Title of the invention: SIPHON FOR WATER DISTRIBUTION SYSTEM TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a siphon configured to discharge at least a portion of the water contained in a tank into a bowl, when the height of water in the tank exceeds a priming height.

[0002] The present invention also relates to a water distribution system comprising a siphon which is the subject of the invention. For example, the water distribution system is a toilet bowl flush or an irrigation system for a container for growing plants. STATE OF THE ART

[0003] The prior art knows siphons positioned in a tank and initiated by the rise in the level of a liquid, usually water, in the tank up to a trigger threshold. The rise in the water level is usually caused by the action of a user, by pressing a button or rotating a lever for example. The rise in the water is then initiated by adding water to the tank, by a water supply means, or initiated by the immersion of a volume in the water contained in the tank, as described in patent BE 395179. In all cases, the rise in the water level has the effect of causing the water contained in a rising water pipe forming one part of the siphon to overflow into a descending pipe forming the other part of the siphon.A siphon effect then begins, which is maintained until air is introduced into the downcomer, which has the effect of disabling the siphon, i.e. interrupting the flow of water from the tank to the downcomer.

[0004] The prior art knows siphons in the shape of an inverted "U", one branch of the "U" forming the descending pipe and the other forming the ascending pipe, as described by the French patent published under number 760,629, for example. The prior art also knows siphons in the shape of an "m" like that described by British patent number 757,863. Finally, the prior art knows siphons formed of two cylinders nested one inside the other, so that an ascending pipe is formed on the periphery and the ascending pipe is formed in the center of the assembly constituted by the two cylinders nested together. In other words, the ascending pipe is delimited by the cylinder placed on the outside on the one hand and by the cylinder placed on the inside on the other hand, and the descending pipe is delimited by the cylinder placed inside. Such an arrangement is for example described by French patent application FR1400948 A.

[0005] The present patent application relates to a siphon corresponding to the latter type, that is to say to a siphon formed by two cylinders nested one inside the other. OBJECTS OF THE INVENTION

[0006] The present patent application aims to make improvements to this type of siphon, in particular to improve its shape to allow better flow of the liquid and / or easier priming of the siphon or to allow easier manufacture of the siphon.

[0007] To this end, according to a first aspect, the invention relates to a siphon adapted to be connected to a water distribution system, in particular to a toilet flush comprising a tank supplied by a water supply means, in which said siphon is configured to discharge at least part of the water from the tank into a bowl, when the water height in the tank exceeds a priming height, the siphon comprising a first cylinder called "external" and a second cylinder called "internal" placed inside the external cylinder and in which: - the siphon has a connector configured to ensure a watertight connection between the outer cylinder and the inner cylinder, such that the outer cylinder, the inner cylinder and a portion of the connector delimit a water pipe called an “upstream pipe” and such that the inner cylinder and a portion of the connector delimit a water pipe called a “downstream pipe”, - the outer cylinder has a lower end connected to a reservoir and an upper end connected to the connector, - the inner cylinder has a flared upper end widening upwards and a lower end connected to a water discharge pipe to a bowl, - the siphon has a shutter projecting into the inner cylinder at its upper end and partially closing it, so as to reduce the volume that can be occupied by air between two primings of the siphon.

[0008] Thanks to these arrangements, the siphon is primed more easily during a flush cycle.

[0009] A flush cycle is described below which relates to the discharge of water from a sanitary cistern to a toilet bowl as well as the discharge from a water tank to a plant growing container, or for any other water distribution system to a bowl requiring a sensitive trigger siphon. The term "bowl" is used to designate indifferently a toilet bowl or a grow bed. Prior to a flush cycle, the water level in the tank, and therefore in the siphon riser, will have previously been raised just below a priming threshold. During the flush cycle, the water level is further raised to exceed the priming threshold. Beyond this threshold, water overflows from the riser to the siphon faller and primes the siphon. Water continuously flows through the riser and faller pipes into the bowl until air from the tank or introduced by a depriming means deprimes the siphon.

[0010] The siphon according to the invention comprises an inner cylinder whose upper end is flared. Said upper end of the inner cylinder forms the wall over which the water must overflow to flow from the rising pipe of the siphon to its falling pipe. Thanks to the flared shape of the upper end of the inner cylinder, the contact area with the water formed by said wall is larger compared to a siphon of the prior art comprising a straight-shaped inner cylinder. This larger contact area facilitates the priming of the siphon. This effect can be attributed to the increased surface tension between the water and the wall at the upper end of the inner cylinder, due to the flared shape of said cylinder, which increases the contact area between the water about to overflow and the wall at the top of the inner cylinder.

[0011] Furthermore, the siphon according to the invention comprises a shutter projecting into the inner cylinder at its upper end and partially closing it, so as to reduce the volume that can be occupied by air between two primings of the siphon. The flared shape of the inner cylinder and the presence of the shutter have a synergistic effect of facilitating the priming of the siphon, which can thus be carried out reliably, even with a slight rise in the water level above the priming threshold.

[0012] In embodiments, the inner cylinder comprises a straight portion of substantially uniform section, integral with the flared end of said cylinder, and the circumference of the inner cylinder at the flared end is at least 1.2 times greater than the circumference at a cross-section of the inner cylinder.

[0013] Preferably, the circumference of the inner cylinder at the flared end is at least 1.3 times larger, preferably 1.5 times larger, very preferably 1.8 times larger than the circumference at a cross-section of the inner cylinder.

[0014] The applicant company has found that an effect of improving the priming of the siphon can be obtained as soon as and the circumference of the inner cylinder at the level of the top the flared end is at least 1.2 times larger than the circumference at a cross-section of the inner cylinder and that this effect is enhanced when this ratio is raised above 1.3, above 1.5, or even above 1.6. In order to obtain both an ideal performance of the priming initiation effect and a good compactness of the siphon, the circumference of the inner cylinder at the flared end is between 1.2 and 3 times larger than the circumference at a cross-section of the inner cylinder. Preferably this ratio is between 1.2 and 2 times.

[0015] In embodiments, the shutter is formed by a recess in the connector. The recess in the connector thus penetrates into the volume delimited by the inner cylinder.

[0016] Thanks to these arrangements, the number of parts required to form the siphon is less compared to other embodiments where the shutter could be constituted by an added part separate from the connector.

[0017] In embodiments, the shutter has a “V” or “M” shape in longitudinal section, such that the upper end of the descending pipe has a “Y” shape in longitudinal section.

[0018] In embodiments, the outer cylinder and the inner cylinder are straight cylinders. For example, the inner cylinder and / or the outer cylinder has a parallelepiped shape or has a polygonal section.

[0019] Thanks to these arrangements, the manufacture of the outer cylinder and / or the inner cylinder is made easier compared to a more complex shape. In addition, the flow of water is facilitated.

[0020] In embodiments, the outer cylinder and the inner cylinder are tubular in shape, such that the riser has an annular cross-section and the faller has a circular cross-section.

[0021] Thanks to these arrangements, the circulation of the liquid in the rising pipe and the falling pipe is optimal and the manufacture of the siphon is facilitated.

[0022] Advantageously, the inner cylinder and the outer cylinder are centered relative to each other.

[0023] In embodiments, the connector is an attached part, fixed to the outer cylinder, so as to ensure a sealed connection between the rising pipe and the falling pipe.

[0024] Advantageously, the inner cylinder is formed in one piece, the flared portion of the inner cylinder being due to the shape of the inner cylinder.

[0025] In other embodiments, the inner cylinder is formed by at least two parts including a straight tubular part and an attached part securely attached to the top of said straight tubular part. The attached part is for example in the shape of an inverted and truncated cone, the truncation of the cone being firmly fixed to the top of said straight tubular part.

[0026] In embodiments, the connector comprises a shoulder, allowing the connector to be mounted on the outer cylinder and / or on the inner cylinder.

[0027] In embodiments, the siphon is formed in one piece, using an additive manufacturing process.

[0028] According to a second aspect, the invention relates to a toilet flushing system comprising a tank, a water supply means and a siphon configured to discharge water from the tank into a toilet bowl when the water height in the tank exceeds a priming height, in which the siphon is a siphon as described above.

[0029] The aims, advantages and particular characteristics of the flushing system which is the subject of the present invention being similar to those of the siphon which is the subject of the present invention, they are not recalled here.

[0030] According to a third aspect, the invention relates to a system for irrigating a tank for growing plants comprising a reservoir, a water supply means and a siphon configured to discharge water from the reservoir into a growing tank when the water height in the reservoir exceeds a priming height, in which the siphon is a siphon as described above.

[0031] The aims, advantages and particular characteristics of the irrigation system of a tank for growing plants which is the subject of the present invention being similar to those of the siphon which is the subject of the present invention, they are not recalled here. BRIEF DESCRIPTION OF THE FIGURES

[0032] Other advantages, aims and particular characteristics of the invention will emerge from the following non-limiting description of at least one particular embodiment of the siphon and of the toilet flushing system comprising such a siphon, objects of the present invention, with reference to the appended drawings, in which:

[0033] [Fig.l] schematically represents a flushing system for sanitary facilities comprising a siphon which is the subject of the invention.

[0034] [Fig.2] represents, schematically and side by side, a longitudinal sectional view and an external view of a particular embodiment of the siphon which is the subject of the invention.

[0035] [Fig.3] represents a detailed view of the longitudinal section of [Fig.2], centered on the upper part of the siphon, at the level of the connector,

[0036] [Fig.4] represents a detailed view of the longitudinal section of [Fig.2], centered on the lower part of the siphon, at the level of the water inlet from the tank and the water outlet towards the bowl,

[0037] The reference numbers mentioned in the figures relate to: 10 Toilet flush 110 Tank 112 Narrow part at the base of the tank 114 Collection cavity 115 Siphon housing 116, 118 Portions of the reservoir 130 Water supply line 131 End of the supply line 135, 136 Valves 170 Water height sensor 175 Electronic card 180 Toilet flush button 300 Siphon 305 Opening between the riser pipe and the tank 310 Upward Driving 318 High point of the rising pipe 320 Downward driving 321 High point of the downpipe 330 external cylinder 340 internal cylinder 341 Flared top end 342 Right part of the internal cylinder 345 Diameter at the top of the inner cylinder 346 Diameter at the right side of the inner cylinder 350 Connector 351 Recess of the connector forming the shutter 380 Joint 800 Support housing the 110 tank 905 Water height corresponding to the priming threshold DETAILED DESCRIPTION OF THE INVENTION

[0038] The present description is given without limitation, each characteristic of an embodiment being able to be combined with any other characteristic of any other embodiment in an advantageous manner.

[0039] [Fig.l] shows a particular embodiment of a toilet flushing system 10 according to the invention, which comprises a siphon 300. The toilet flushing system 10 comprises a tank 110, mounted in a support 800 positioned above a toilet bowl (not shown). The support 800 housing the tank 110 is for example mounted on a wall above a toilet bowl, mounted in a box or even directly attached to the bowl.

[0040] The reservoir 110 is illustrated in longitudinal section. It is emphasized that the cross-section of the reservoir 110 may be circular or rectangular or adopt any other shape, provided that the reservoir 110 has a sufficient volume to dispense the desired volume of water. Advantageously, the cross-section (not shown) of the reservoir is rectangular to reduce the size of the reservoir 110.

[0041] The flushing system 10 comprises a water supply means configured to fill the tank 110. Said water supply means comprises a pipe 130 connected to a water source, for example to a municipal water circuit, a valve 136 being able to be opened or closed on command of the user of the flushing system or on automatic command. One end 131 of the pipe 130 is positioned in the tank 110, so that the opening of the valve 136 has the effect of discharging water into the tank 110 through the open end 131 of the pipe 130.

[0042] Advantageously, the valve 136 is a solenoid valve controlled by an electronic card 175. The opening of the valve 136 in order to discharge water into the tank can be controlled as a function of a water level contained in the tank 110 or as a function of an interaction of the user with a human-machine interface, for example a button 180. In order to ensure the proper functioning of a flushing cycle, as described previously in the present application, the valve 136 is opened prior to triggering the flushing and kept open until the tank 110 is partially filled with water to a height substantially lower than the height corresponding to the threshold 905 for priming the siphon 300.

[0043] Advantageously, the water level in the tank 110 is detected by a means for measuring a value representative of the height of water in the tank 100. For example, this means is an optical sensor 170 measuring the distance between the sensor 170 and the surface of the water. In other embodiments, one or more sensors of the optical, capacitive or resistive type are implemented.

[0044] In embodiments (not shown), at least one sensor detecting the water height in the tank 110 by immersion of the sensor is implemented. For example, a sensor is positioned just below the height corresponding to the priming threshold in the tank 110, so that, when this sensor detects that it is submerged, the valve 136 is cut off. A plurality of sensors detecting the water height in the tank 110 by immersion may be positioned at different heights in the tank to detect the water height in the tank.

[0045] During the flush cycle, following an automatic command or following a press of the button 180 by a user, the water level in the tank 110 can be raised above the priming threshold 905 by opening the valve 136. The water thus added to the tank 110 causes water to overflow from an ascending pipe 310 of the siphon 300 to a descending pipe 320 of the siphon and primes the siphon. The water continuously flows through the pipes of the siphon to a bowl, until the water runs out in the tank 110 and air from the tank enters the siphon 300 and deprimes it.

[0046] Advantageously, a second valve 135 is provided on the pipe 130 to stop the flow of water to the tank 110, for example in the event of a leak or during a maintenance operation on the flushing system 10. The valve 136 is for example a tap or a manual valve of the all-or-nothing type. During normal operation of the flushing system 10, the valve 135 is always open.

[0047] It is noted that the valves 135 and 136 are preferably positioned on sections of the pipe 130 which are housed inside the reservoir 110, so that water flows at the level of these valves, in the event of a leak or during the manipulation of a valve, flow into the reservoir 110.

[0048] The siphon 300 is for example a cylindrical, preferably tubular, siphon formed by an outer cylinder, an inner cylinder housed in the outer cylinder and a connector 350, configured to establish a sealed connection between the two cylinders. According to the example illustrated in [Fig.l], the siphon 300 is centrally positioned, vertically, in the tank 110. The siphon 300 is mounted in a housing 115 provided in the bottom of the tank 110. The siphon 300 comprises an annular seal 380 which can be inserted into said housing so that the siphon 300 is held vertically in place in the housing 115 and so that the descending pipe of the siphon 300 is made to communicate with a pipe for discharging water towards a bowl. One or more openings 305 are pierced around the perimeter of the siphon 300 at its base to allow water to circulate from the reservoir 110 to the rising pipe 310 of the siphon 300.

[0049] The structure and advantages of a siphon 300 will be better understood with regard to the description of figures 2, 3 and 4 which illustrate a particular embodiment of such a siphon.

[0050] The tank 110 comprises a narrow portion 112 formed by a narrowing of the walls of the tank 110 at its base. The narrow portion 112 forms a water collection cavity 114 configured to collect at least a portion of the water flowing back from the riser pipe 310 to the tank 110 after a flush operation.

[0051] It is emphasized that the pipe 130 of the water supply means has an end 131 opening into the collection cavity 114. The end 131 of the pipe 130 is positioned to be immersed by the water flowing back into the tank 110 after the flush 10 is actuated. Advantageously, one or more openings 305 pierced around the periphery of the siphon 300 are also positioned in the water collection cavity 114.

[0052] In the example shown in [Fig. 1], the narrow part 112 of the reservoir 110 has the shape of a truncation of a right cone. In other embodiments, the shape of the narrow part is hemispherical or rectangular. It is emphasized that the narrow part can be formed by the walls of the reservoir 110 or be formed by any other structure, for example by inserts of suitable shape placed in the reservoir 110, provided that the structures implemented make it possible to form a collection cavity.

[0053] The reservoir 110 has a portion 116 whose section is of reduced size. This portion of the reservoir is positioned at the priming height 905 of the siphon 300. This narrowing of the reservoir at this level makes it possible to raise the water level more quickly when the flush 10 is actuated.

[0054] The tank 110 further comprises a portion 118 of the tank 110 placed above the portion 116, the cross-section of which is of reduced size. The cross-section of the portion 118 is larger than the cross-section of the portion 116. Thus, the tank 110 has a larger interior volume on its upper part. This shape is advantageous because it makes it possible to house in the tank 110 elements, 130, 135, 136 of the water supply means, in particular the valves 135 and 136, which discharge water into the tank 110 in the event of a leak or during maintenance of the flush 10.

[0055] In [Fig.2] we see a longitudinal sectional view, shown on the left in [Fig.2], and an external view, shown on the right in [Fig.2], of a particular embodiment of a siphon 300, object of the invention. [Fig.3] represents a detailed view of the longitudinal section of [Fig.2], centered on the upper part of the siphon, at the connector 350. Finally, [Fig.4] represents a detailed view of the longitudinal section of [Fig.2], centered on the lower part of the siphon, at the water inlet from a tank and the water outlet to a bowl.

[0056] The siphon 300 is adapted to be connected to a water distribution system, in particular to a toilet flush as described previously, with reference to [Fig. 1]. The siphon 300 comprises a first cylinder 330 called the outer cylinder and a second cylinder 340 called the inner cylinder placed inside the outer cylinder 330. In addition, a part of the siphon 300 forms the connector 350 which is a part configured to ensure a sealed connection between the outer cylinder 340 and the inner cylinder 330.

[0057] The siphon 300 is configured to allow the evacuation of a large volume of water from a tank to a bowl. The path of the water in the siphon 300 is described as follows: several openings 305 pierced on the periphery of the outer cylinder 330 at its lower end allow the circulation of water from the tank 110 to an ascending water pipe 310 delimited by the outer cylinder, the inner cylinder and a portion of the connector 350.

[0058] It is specified at this stage that the terms “upper” and “lower” are understood in relation to a siphon in a normal position of use, for example positioned as illustrated in Figures 1 and 2. Thus, the upper end of the siphon or of a cylinder is the end located at the top of the siphon and the lower end corresponds to the end at the bottom of the siphon.

[0059] When the water level of the tank in which the siphon 300 is installed rises, the water gradually rises in the rising pipe until it reaches the top, at the height where the water can overflow into a falling pipe 320. This water height is just above that illustrated in [Fig. 3] by the dotted line bearing the reference number 345. When a siphon is primed by water overflowing into the falling pipe 340, the water flows into the falling pipe, into a water discharge pipe connected to a bowl (not shown). The falling pipe is delimited by the wall of the inner cylinder 340.

[0060] The outer cylinder 330 and the inner cylinder 340 are preferably tubular in shape, so that the rising pipe has an annular cross-section and the falling pipe has a circular cross-section.

[0061] In other embodiments (not shown), the outer cylinder and the inner cylinder are straight cylinders. For example, the inner cylinder and / or the outer cylinder has a parallelepiped shape or has a polygonal section.

[0062] The inner cylinder 340 and the outer cylinder 330 are centered relative to each other, both on a transverse and longitudinal section plane. Thus the siphon is a symmetrical part, according to an axial symmetry around a longitudinal central axis. A siphon of non-symmetrical shape may be implemented without deviating from the invention, in particular with a view to adapting the shape of the siphon to particular tank shapes.

[0063] Regardless of the embodiment, the dimensions of the inner and outer cylinders, 330 and 340, are provided to ensure that the cross-section of the rising pipe 310 is greater than or equal to the cross-section of the falling section 320, so that the rising water flow rate, coming from the reservoir, is sufficient to continuously supply the falling pipe and to saturate the falling pipe with water. These arrangements make it possible to prevent the siphon from spontaneously losing its prime during a cycle of flushing the toilet, after priming the siphon but before emptying the water contained in the tank.

[0064] The inner cylinder 340 comprises a straight portion 342 of substantially uniform section which extends over the lower end of the inner cylinder and over its central part. This straight portion 342 is extended at the upper end 341 of the inner cylinder by a flared portion which widens upwards. The section of the flared portion gradually widens from the bottom upwards, forming an upper end of the inner cylinder 340, the longitudinal section of which reveals a “V” shape.

[0065] In other embodiments (not shown), the section of the upper end of the inner cylinder 340 is increased in stages, forming an upper end of the inner cylinder 340 whose longitudinal section reveals a stepped shape.

[0066] In embodiments, the flared portion is constituted by an attached part fixedly attached to a tube forming the straight portion of the inner cylinder 340. In other embodiments, the inner cylinder is manufactured in one piece, for example by thermoforming or by stamping.

[0067] It is emphasized that the circumference of the inner cylinder 340 at the top of the flared end, on the section of the inner cylinder 340 whose diameter is marked by the reference 345 in [Fig. 3], is of the order of 1.6 times greater than the circumference of the inner cylinder at a cross-section on the straight part 342 of the inner cylinder 340, for example at the section whose diameter is marked by the reference 346 in [Fig. 3].

[0068] In other embodiments (not shown) the circumference of the inner cylinder 340 at the top of the flared end is at least of the order of 1.2 times greater than the circumference of the inner cylinder at a cross-section on the straight portion 342 of the inner cylinder 340. For example, this ratio is between 1.2 and 3. The upwardly widening flared shape of the inner cylinder has the effect of increasing the circumference at the top of the inner cylinder and increasing the surface area of ​​the inner cylinder in contact with the water. These arrangements increase the interactions between the water and the cylinder wall by surface tension and facilitate the priming of the siphon when the water overflows from the rising pipe 310 to the falling pipe 320.

[0069] The siphon 300 comprises a shutter projecting into the inner cylinder 340 and partially closing it by occupying a part of the volume delimited by the upper end 341 of the inner cylinder 340. Thus, this volume which can be occupied by air between two primings of the siphon is reduced. The reduction of the volume of stagnant air in this volume of the siphon facilitates its priming.

[0070] According to the preferred embodiment presented in figures 1 to 4, the shutter is formed by a recess 351 of the connector 350. Thus, a cavity is formed on the top of the siphon 300. These arrangements allow a saving of material during the manufacture of the siphon 300 and the obtaining of a lighter siphon 300. In other embodiments, the volume delimited by the recess 351 forming the shutter is a solid part.

[0071] It can be seen in [Fig. 3] that the connector 350 is a part configured to be fixed to the outer cylinder 330. The connector 350 observed in longitudinal section comprises a first vertical straight wall extending the vertical wall of the outer cylinder 330. This first wall is extended by a second horizontal wall then by a third vertical wall and finally a fourth wall slightly inclined relative to the vertical. The first, second and third walls form a first half of the connector 350 enveloping the wall of the upper end 341 of the inner cylinder 340. This diagram is reproduced symmetrically to form the second half of the connector 350, so that the connector 350 observed in longitudinal section has an “M” shape.

[0072] According to the embodiment presented in Figures 2 to 3, the connector 350 is an added part, fixed to the outer cylinder, so as to ensure a sealed connection between the ascending and descending pipes, 310 and 320. It is emphasized that any other configuration making it possible to arrive at a siphon according to the invention, comprising an inner cylinder flared at its top and a shutter, could be implemented without deviating from the invention. For example, the connector 350 could be formed in one piece with the outer cylinder 330.

[0073] In the case where the connector 350 is an added part, the connector 350 and / or the outer cylinder 330 may include a shoulder at the interface between these two parts, making it easier to assemble.

[0074] The parts forming the siphon 300 may be formed in any suitable manner, in particular from plastic or other material. For example, the parts forming the siphon 300 are made of a plastic polymer chosen from polypropylenes (PP), polyvinyl chlorides (PVC), acrylic or polycarbonates (PC). For example, the parts forming the siphon 300 are made of a metal material chosen from aluminum, cast iron or stainless steel.

[0075] The parts forming the siphon 300 may be formed by injection, vacuum casting, blowing or thermoforming of plastics, for example. Or by stamping or die-stamping of metals.

[0076] In embodiments, the reservoir 110 and the inner cylinder 340 are formed as a single piece. For example, the piece forming the reservoir and the cylinder interior are obtained in a single manufacturing step, for example by blow molding.

[0077] In embodiments (not shown), the siphon is formed in one piece, using an additive manufacturing process.

[0078] In embodiments (not shown), the reservoir or at least part of the siphon is formed in one piece. For example, a part obtained by plastic injection has the shape of a reservoir such as that shown in [Fig.l], extended by a tube forming the inner cylinder of the siphon. In this case, an added part forming the connector and the outer cylinder of the siphon can be mounted on the reservoir to complete the siphon.

Claims

Claims

1. A toilet flushing siphon (300) for sanitary facilities comprising a tank (110) supplied by a water supply means, wherein said siphon (300) is configured to discharge at least a portion of the water from the tank (110) into a bowl, when the water height in the tank exceeds a priming height, the siphon comprising a first so-called "outer" cylinder (330) and a second so-called "inner" cylinder (340) placed inside the outer cylinder and characterized in that: - the siphon (300) comprises a connector (350) configured to ensure a sealed connection between the outer cylinder and the inner cylinder, such that the outer cylinder, the inner cylinder and a portion of the connector delimit a water pipe called "upstream pipe" (310) and such that the inner cylinder and a portion of the connector delimit a water pipe called "downstream pipe" (320),- the outer cylinder (330) has a lower end connected to a reservoir and an upper end connected to the connector (350), - the inner cylinder (340) has an upper end (341) of flared shape widening upwards and a lower end connected to a water evacuation pipe towards a bowl, - the siphon has a shutter projecting into the inner cylinder (340) at its upper end (341) and partially closing it, so as to reduce the volume that can be occupied by air between two primings of the siphon and - the connector (350) is an added part, fixed on the outer cylinder (330), so as to ensure a sealed connection between the ascending and descending pipes (310 and 320).,

2. A siphon according to claim 1, wherein the inner cylinder (340) has a straight portion (342) of substantially uniform section, integral with the upper end (341), and wherein the circumference of the inner cylinder at the flared end is at least 1.2 times greater than the circumference at a cross-section of the inner cylinder.

3. Siphon according to one of claims 1 or 2, in which the shutter is formed by a recess (351) of the connector (350).

4. Siphon according to any one of claims 1 to 3, in which the shutter has a longitudinal section in the shape of a "V" or an "M", so that the upper end of the descending pipe has a longitudinal section in the shape of a "Y".

5. A siphon according to any one of claims 1 to 4, wherein the outer cylinder (330) and the inner cylinder (340) are straight cylinders.

6. A siphon according to any one of claims 1 to 4, wherein the outer cylinder (330) and the inner cylinder (340) are tubular in shape, such that the rising pipe (310) has an annular cross-section and the falling pipe (320) has a circular cross-section.

7. A toilet flushing system (10, 20) comprising a tank (110, 210), a water supply means and a siphon (120, 220) configured to discharge water from the tank (110, 210) to a toilet bowl when the water height in the tank exceeds a priming height, characterized in that the siphon (120, 220) is a siphon according to one of claims 1 to 6.

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