Toilet tank water supply system

Abstract

The water supply system (1) includes a main body (2) with an air intake (4), a first pipe (10) connected to a water supply network, a second pipe (20) communicating with the first pipe through an opening (27) and having an inner bore (24) aligned vertically with the air intake (4), a flap (32) capable of blocking the opening (27), a closure member (50) movable between a lower position resting on the inner bore and a higher position blocking the air intake, and a flow control device (40) that generates back pressure downstream of the inner bore. The closure member has a density greater than 1.4, thereby preventing it from floating. The closure member moves to its upper position due to the back pressure.

Description

[Technical Field]

[0001] The present invention relates to a water supply system for a flash tank. [Background technology]

[0002] Conventionally, such systems comprise a pipe connected to the water supply network and opening into a tank, with a valve allowing or preventing the flow of water into the tank depending on the level of water in the tank.

[0003] It is generally essential to prevent water from flowing back into the water supply network, which can occur if negative pressure develops inside the network. For this reason, it is known to provide an air intake at the top of the water supply system. Summary of the Invention [Problem to be solved by the invention]

[0004] In operation, the valve opens, allowing water to flow through the pipes. To prevent droplets from escaping through the air intake, water systems typically include a movable closure that is lifted by buoyancy as soon as the water level is reached. This closure quickly closes the air intake to prevent water from splashing out. This traps air within the system, which mixes with the water to create bubbles and create an unpleasant noise.

[0005] The present invention aims to overcome this drawback, i.e., to reduce or eliminate the cavitation noise associated with valve opening. [Means for solving the problem]

[0006] To this end, in a first aspect, the present invention relates to a water supply system for a flash tank, which, in an assembled state, comprises: a main body having an air intake at an upper portion; a first pipe provided within the main body and configured to be connected at its upstream end to a water supply network; a second pipe at least partially disposed within the body, the second pipe having an upstream end in fluid communication with the first pipe through the opening and a downstream end positioned lower than the upstream end, the second pipe including an inner bore positioned substantially vertically aligned with the air intake, a periphery of the inner bore forming a support surface; a valve attached to the main body, which can be in a closed state to seal and block the opening or in an open state to open the opening depending on the water level in the tank; a closing member that is placed on a support surface, forms a communication space between the inside and outside of the second pipe in the inner hole, and is movable between a low position in which the air intake is opened and a high position in which the air intake is closed; Equipped with.

[0007] According to a broad definition of the present invention, the water supply system further includes a flow regulator fixed to the second pipe downstream of the bore and generating back pressure when water flows through the system toward the tank. Furthermore, the closure member has a density greater than 1.4, which prevents it from floating. Therefore, when the system is in an inoperative state with the flap in the closed position and the closure member in the low (down) position, and water flows into the second pipe by opening the valve, the back pressure generated by the flow regulator causes the closure member to move to the high (up) position.

[0008] In this configuration, simply having the water level reach the closure element is not enough for it to move to the raised position, as is the case with prior art systems where the closure element is designed to float. In the system of the present invention, the closure element has a density that prevents it from floating, so an additional force must be applied to make the closure element float. This occurs when the back pressure generated by the flow regulator, i.e., the pressure opposing the fluid flow, is sufficient to cause the closure element to float. Therefore, the movement of the closure element to the raised position in the system of the present invention occurs with a time delay compared to the movement caused by simple buoyancy in prior art systems. This allows more time for the air inside the body to escape through the air intake before it is blocked. As a result, the amount of air bubbles in the water flowing through the water supply system is significantly reduced, significantly reducing noise when the valve is opened.

[0009] In one possible embodiment, the density of the closure element is greater than 2.

[0010] The closure member may be made of a material from the group consisting of stainless steel, glass, aluminum, polyoxymethylene (POM), filled plastic materials (with mineral fillers, glass fibres or carbon fibres), in particular filled polyamides. More generally, the closure member can be constructed of any material that will not float and will withstand water for extended periods of time.

[0011] In one possible embodiment, the closure member is a sphere.

[0012] In this case, the inner hole of the second pipe is oval or substantially elliptical and is configured to leave a communication space between the inside and outside of the second pipe when the sphere is in the low position, thereby allowing air to flow into the second pipe through the air intake when the sphere is in the low position.

[0013] For example, the distance traveled between the lower and upper positions of the closure member is greater than half the height of the closure member, and preferably greater than the height of the closure member. This relatively large distance, greater than that of the prior art, requires a certain amount of time for the air to be expelled through the air intake when the closure member moves to the higher position. This dimensional feature therefore further improves the performance of the system according to the present invention.

[0014] In one possible embodiment, the closure member is disposed in a housing provided on the main body, the housing having a bell shape that converges upward and has a lower opening located near the inner bore of the second pipe and an upper opening located near or forming the air intake, the housing being attachable to the cylindrical part of the main body and capable of guiding the movement of the closure member to the higher position and directing air.

[0015] In one embodiment, the second pipe has a first substantially horizontal section with an internal bore and a second substantially vertical section extending downward therefrom, the internal bore being preferably located near the junction of the first and second sections, such that the closure member is substantially aligned with the second substantially vertical section and is therefore directly affected by back pressure.

[0016] In one embodiment, the support surface formed by the bore extends in a plane inclined downstream at an angle between approximately 4° and 8° relative to the horizontal. Furthermore, the bore is oval or substantially elliptical, with a larger dimension (due to said inclination) in a direction generally parallel to the axis of the first section of the second pipe. This allows the closure member to be reproducibly positioned at the downstream end of the bore by gravity in the low position. The upstream portion of the bore is free, allowing for efficient evacuation of air.

[0017] The water supply system further includes a cap attached to the main body above the air intake, the cap being positioned opposite the air intake and having a channel with a hole opening to the outside of the main body, such that droplets ejected from the inside of the main body through the air intake enter the channel at the installation position of the system and are guided therein until they fall back into the tank. Closing the air intake later than in the prior art could lead to droplets being ejected from this port, which is undesirable, and the cap can limit the ejection of droplets. This configuration, according to the present invention, reduces noise generated when controlling splashing. Naturally, the cap does not prevent air from flowing in through the air intake, allowing air to flow in through the channel in the cap.

[0018] In a second aspect, the present invention relates to a toilet comprising a toilet bowl, a flush tank and a water supply system to said tank.

[0019] In a first embodiment, the flow control device has a tip portion fixed to the downstream end of the second pipe, the tip portion having a convergent portion and configured to form part of a suction device using the Venturi effect. In this case, back pressure is generated by restricting the cross-sectional area of ​​the water flow. With this configuration, the toilet can include a flush system, and the flush system can: The aforementioned water supply system (1); a vertically upward discharge pipe attached to the tip, the upstream end of the discharge pipe being positioned opposite the downstream end of the tip, and at least one port being provided between the tip and the discharge pipe to allow water in the tank to be sucked in by the Venturi effect; and a discharge pipe attached to the downstream end of the discharge pipe for directing water toward the toilet bowl.

[0020] The flush tank can be located at approximately the same height as the toilet bowl because the water supply operates by the Venturi effect and does not require gravity. The toilet can further include a flush tank filling system that is separate from the flush system.

[0021] In a second embodiment, the flow control device includes a sleeve mounted inside the second pipe, the sleeve including a collection of balls through which water can flow, forming a silencer that can reduce noise caused by the flow. In this case, forcing the water flow through the balls creates back pressure. In this configuration, the water supply system forms a filling system for the flash tank.

[0022] Possible embodiments of the invention will now be described, by way of non-limiting example, with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic view of a longitudinal section in plane P1 of a water supply system to a flash tank according to the invention, the system including a flow regulator and a closure member, the closure member being in a lowered position. [Figure 2] FIG. 2 is a partial perspective view of the system of FIG. 1 cut along a vertical plane P2 perpendicular to plane P1. [Figure 3] FIG. 3 is a partial perspective view of the system of FIG. 1 cut along plane P1. [Figure 4] FIG. 4 is a detailed view in plane P1 of the water supply system when the closure member is in the high position. [Figure 5] FIG. 5 is a detailed view of the cross section in plane P2 when the closure member is in the high position. [Figure 6] FIG. 6 is a perspective view of a flush system including a water supply system according to the first embodiment. [Figure 7] FIG. 7 is a perspective view of a toilet including the flush system of FIG. [Figure 8] FIG. 8 is a detailed view in longitudinal section of the flush system of FIG. 6, showing the flow regulator. [Figure 9] FIG. 9 is a cross-sectional view of a water supply system according to a second embodiment, which forms a flash tank filling system. [Figure 10]FIG. 10 is a detailed view of the flow regulator of the system of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] 1 shows a water supply system 1 according to one embodiment of the present invention. This water supply system 1 is capable of supplying water to a flush tank 101 provided in a toilet 100 such as that shown in FIG.

[0025] In the following, the water supply system 1 will be described in its installed position.

[0026] The water supply system 1 includes a main body 2. The main body 2 is provided with a first pipe 10 configured to be connected at its upstream end 11 to a water supply network. The first pipe 10 opens at its downstream end into a chamber 12.

[0027] At least a portion of the second pipe 20 is provided within the main body 2. The second pipe 20 has an upstream end 25 that is in fluid communication with the chamber 12 and thus with the first pipe 10 via an opening 27, and a downstream end 26 that is located below the upstream end 25.

[0028] In one possible embodiment, the second pipe 20 is disposed within the body 2 and has a substantially horizontal first portion 21 extending from the opening 27 to a substantially vertically downward second portion 22, which may also be disposed within the body 2. The second pipe 20 may further include a third portion 23 that is sealingly mounted within the body 2 and extends the second portion 22 vertically downward outside the body to a downstream end 26. The first portion 21 has an axis A21, and the second portion 22 has an axis A22.

[0029] The water supply system 1 further includes a valve 30 attached to the main body 2. The valve 30 can include, on the one hand, a case 31 that defines an internal space and has an opening on the side facing the second pipe 20, and, on the other hand, a closure element (flap) 32 attached to the opening of the case 31.

[0030] The closure element 32 has a head 33 that fits onto the second pipe 20, and an annular groove is formed at the base of the head 33, and a flexible membrane 34 that can be applied to the opening 27 is attached to the annular groove. Furthermore, the case 31 is provided with a small-diameter port 39 on the opposite side of the closure element 32.

[0031] Depending on the water level in the tank 101, the valve 30 can be in a closed state, which seals and blocks the opening 27 to prevent water from flowing into the second pipe 20, or in an open state, which opens the opening 27 to allow water to flow into the second pipe 20.

[0032] More specifically, a lever 35 is mounted on the main body 2 so as to be rotatable about an axis A35, which in this example is substantially horizontal and parallel to the opening 27. The lever 35 includes a seal 36 disposed opposite a port 39, and is connected to a float 37 via, for example, a rod 38. Thus, vertical movement of the float 37 pivots the lever 35, moving the seal 36 and blocking or opening the port 29. Depending on the pressure balance, the membrane 34 is pressed sealingly against the opening 27, closing the valve 30, or the membrane 34 is moved away from the opening 27, opening the valve 30.

[0033] The main body 2 is provided with an air intake 4 at its top. The air intake 4 preferably extends in a substantially horizontal plane and is preferably provided at the highest part of the main body 2. For example, as shown in FIG. 1 , the main body 2 may be positioned higher than the first pipe 10 and the second pipe 20, protruding upward, and having a cylindrical portion 3 with a vertical axis. The cylindrical portion 3 is open at its upper end, and this opening or a part of this opening forms the air intake 4. The air intake 4 has a substantially vertical axis A4. The axis A4 may substantially coincide with the axis A22 of the second portion 22 of the second pipe 20.

[0034] 1 and 2, plane P2 is defined as a vertical plane that is perpendicular to the first pipe 10 and includes axis A4. Plane P1 is defined as a vertical plane that is perpendicular to plane P2 and includes axis A4.

[0035] The second pipe 20 has an inner hole 24 that is disposed in substantial vertical alignment with the air intake 4. In other words, the air intake 4 is located almost directly above the inner hole 24. The inner hole 24 is disposed in the first portion 21 of the second pipe 20, preferably near the junction between the first portion 21 and the second portion 22 of the second pipe 20.

[0036] The bore 24 has a periphery 28 that forms a support surface. The bore 24 may be elliptical (oval) in shape, with the width of the bore being greater (longer diameter) in plane P1 than in plane P2, as shown in Figures 1 and 2. The bore 24 has a substantially vertical axis A24. The axis A4 of the air intake 4 and the axis A24 of the bore 24 are substantially the same or very close to each other.

[0037] The water supply system 1 further includes a flow control device 40, shown schematically in Figure 1. The device 40 is fixed to the second pipe 20 downstream of the bore 24. Due to its configuration, the device 40 creates back pressure when water flows through the system 1 toward the tank 101. Preferably, the device 40 is located downstream of the body 2, such as in the third section 23 of the second pipe 20 as shown in Figure 1, or downstream of the downstream end 26 of the second pipe 20 as will be described below with reference to Figures 6 to 8.

[0038] Furthermore, the water supply system 1 includes a closure member 50 that blocks the air intake 4 when the valve 30 is open to limit splashes. a low position (FIGS. 1 to 3) in which the closure member 50 rests on the support surface 28 to form the inner hole 24, which is the communication space 29, between the inside and outside of the second piping 20 and the air intake 4 is open; a high position blocking the air intake 4 (Figs. 4 and 5); It is possible to move between

[0039] According to the present invention, the density of the closure member 50 is greater than 1.4. Density is defined as the ratio of the mass of an object to the mass of an equivalent volume of water, i.e., the ratio of the mass density of the object to the mass density of the reference water. Therefore, the closure member 50 cannot float in water; instead, it sinks. Under these conditions, the movement of the closure member 50 from the lower position to the higher position is not caused by the buoyancy of the water flowing through the water supply system 1, but by a thrust caused by the back pressure generated by the flow control device 40, i.e., a thrust caused by the pressure opposing the water flow.

[0040] The closure member 50 may be made of stainless steel having a density in the range of 7 to 8, or glass having a density in the range of 2.4 to 2.8.

[0041] The closure member 50 may be a sphere.

[0042] For example, 1.5 to 2.5 grams of stainless steel spheres can be used.

[0043] As shown in Figure 4, the support surface formed by the bore 24 can be configured to extend substantially in a plane inclined in the downstream direction at an angle α between 4° and 8° relative to the horizontal. This inclination allows a particularly effective arrangement for an elliptical (oval) bore 24 whose major axis is arranged approximately parallel to the axis A21 of the first section 21 of the second pipe 20. In fact, in this configuration, gravity causes the closure member 50 to reproducibly position itself at the downstream end of the bore 24 in the low position. Furthermore, the upstream part of the bore 24 is freed, allowing for more effective air evacuation.

[0044] 1, the closure member 50 is arranged in the cylindrical portion 3 of the body 2. In one possible embodiment, the cylindrical portion 3 is provided with a housing 5 for accommodating the closure member 50. The housing 5 is sealingly mounted in the cylindrical portion 3 and extends over substantially the entire height of the cylindrical portion 3.

[0045] The housing 5 has a bell-shaped configuration that converges upward. The housing has a lower opening 6 at its bottom that is located near the bore 24 of the second pipe 20, and an upper portion that has an inner collar 7 that defines a substantially circular central opening with a vertical axis, which central opening forms the air intake 4. As a result, the air intake 4 is provided in a substantially horizontal wall surface.

[0046] The operation of the water supply system 1 is as follows.

[0047] When the tank 101 is full, the float 37 is in the high position and the water supply system 1 is in the inactive state with the flap 32 in the closed position and the closure member 50 in the low position (see Figures 1 to 3).

[0048] From this inactive state of the system 1, when the water level in the tank 101 drops, typically after the flush system has been activated, the float 37 descends, the lever 35 pivots, and the flap 32 opens. This allows water from the water supply network to flow into the second pipe 20. This flow by itself is not enough to move the closure element 50 to its upper position, as the closure element 50 is too dense to float. However, the inflow of water into the flow regulator 40 creates back pressure. This pressure increase downstream of the flow regulator 40 exerts sufficient force on the closure element 50 to cause it to move to its upper position (Figures 4 and 5).

[0049] The rise of the closure member 50 does not occur immediately due to the floating phenomenon, but occurs after a delay while back pressure is generated, so that the air present in the main body 2, and particularly in the housing 5, is discharged through the air intake 4, which is not immediately blocked.

[0050] The converging shape of the housing 5 can guide the movement of the closure member 50, thereby preventing clogging of the closure member 50, especially when the closure member 50 and the air intake 4 are not perfectly vertically aligned, as shown for example in Figure 1. The converging shape of the housing 5 can also guide the air towards the air intake 4.

[0051] To further lengthen the time required to close the air intake 4 and thus expel more air, the distance d that the closure element 50 moves from the low position to the high position can be set relatively large. This distance d is therefore greater than half the height h of the closure element 50 (i.e., the diameter of the closure element if it is spherical), and preferably greater than this height h. For example, the distance d is in the range of 1.25 x h. According to one embodiment, the distance d is comprised between 10 mm and 15 mm.

[0052] Because the air intake 4 is not immediately blocked when water begins to flow into the second pipe 20, droplets may pass through its opening, which is undesirable. To limit splashing, a cap 52 may be provided above the air intake 4 and attached to the main body 2. The cap 52 may include, for example, a skirt 53 that is screwed or clipped onto the cylindrical portion 3 of the main body 2, a side wall 54, and a channel 55 located above the side wall 54 and extending approximately parallel to the side wall 54. The channel 55 has a hole located opposite the air intake 4 and opens to the outside of the main body 2 through a hole 56. Therefore, droplets splashing from inside the main body 2 through the air intake 4 enter the channel 55, hit its upper wall, and then always return to the channel 55 and are guided to the hole 56, ultimately falling into the tank 101 to which the water supply system 1 is attached.

[0053] Naturally, air also flows into the air intake 4 through the channel 55 .

[0054] Additionally, a deflector 60 (see FIGS. 4 and 5) can be fitted over the cap 52 to ensure that splashing is as discreet and noise-free as possible.

[0055] Such a water supply system 1 is configured as part of a toilet 100, which further comprises a flush tank 101 and a toilet bowl 102. The system 1 is generally housed within the tank 101. The water supply system 1 can be used in a variety of ways, as will be explained below.

[0056] A first embodiment is shown in Figures 6 to 8.

[0057] In this case, the flow control device 40 has a tip 41 fixed to the downstream end 26 of the second pipe 20. More specifically, the downstream end 26 of the second pipe 20 is disposed near the bottom surface 103 of the tank 101, as shown schematically in FIG. 8, and the tip 41 can be fixed to the downstream end 26 of the second pipe 20 via an intermediate pipe 15. The intermediate pipe 15 has an angled shape that changes the flow of water from a substantially vertical downward direction to a substantially vertical upward direction. As a result, the tip 41 is passed by the ascending flow of water. The inlet 16 of the intermediate pipe 15, which is directly fixed to the downstream end 26 of the second pipe 20, and the outlet 17 of the intermediate pipe 15 can be disposed at substantially the same height.

[0058] The tip 41 has a converging section, which has a substantially cylindrical upstream section extended by a substantially truncated downstream section.

[0059] Furthermore, a discharge pipe 42 is attached to the tip portion 41 so as to face vertically upward. To this end, the tip portion 41 has a collar 43 at its downstream end, and the upstream end of the discharge pipe 42 is fixed to the upstream end of the collar 43, and is disposed opposite the tip portion 41. The collar 43 is provided with at least one port 44, and preferably has a reinforcing fin 45. Furthermore, a water discharge pipe 46 is attached to the downstream end of the discharge pipe 42.

[0060] When the flap 32 opens and water circulates in the second pipe 20, the narrowed portion (throttled portion) formed by the tip 41 increases the water flow rate and reduces the pressure, causing the water contained in the tank 101 to be sucked into the discharge pipe 42 through the port 44. As shown in Figure 8, the tip 41 and the upstream portion of the discharge pipe 42 form a suction device 106 using the Venturi effect.

[0061] The discharge pipe 46 is configured to direct water toward the toilet bowl 102. For this purpose, the discharge pipe 46 is bent so that its downstream end can be positioned within the toilet space 107 that communicates with an overflow portion 108 that opens at the top of the toilet bowl 102, or at a position opposite thereto.

[0062] Thus, the water supply system 1 , the discharge pipe 42 and the discharge pipe 46 constitute a flush system 105 .

[0063] Such a flush system 105 operates based on suction caused by the Venturi effect and does not rely on gravity. Therefore, the flush tank 101 does not need to be placed at a high position. As shown in Figure 7, the tank 101 can be placed at approximately the same height as the toilet bowl 102, allowing for a very compact toilet 100.

[0064] Additionally, the toilet 100 includes a filling system 109 for the flush tank 101 that is separate from the flush system 105 .

[0065] Reference is now made to Figures 9 and 10, which illustrate a second embodiment.

[0066] In this example, the flow control device 40 has a sleeve 65 attached to the inside of the second pipe 20, preferably to the third section 23, as shown schematically in FIG. 9. The sleeve 65 includes a collection of balls 66 that allow water to flow and form a silencer that can reduce noise generated by the flow. The sleeve 65 can be filled with the balls 66 over at least 80% of its height. For example, the diameter of the balls 66 can be approximately 1 mm.

[0067] Water passes between the balls 66, slowing its flow and thus creating back pressure.

[0068] 10, the sleeve 65 can be made smaller in diameter than the portion of the second pipe 20 into which it is inserted and can be provided with a peripheral rib 67 to ensure retention and sealing against the inner surface of the second pipe. The sleeve 65 has a main portion 68 containing a ball 66, a larger diameter inlet 68a equipped with a filter element 69, and a smaller diameter outlet 68b having a narrower cross section.

[0069] Such a water supply system 1 forms a filling system 110 for the flash tank 101 intended to be installed in the flash tank 101 .

[0070] Thus, the present invention provides a clear improvement to systems for supplying water to flash tanks, significantly reducing the noise caused by the inflow of water into the tank, especially when the system is equipped with a flow regulator that creates back pressure during operation. Due to the presence of the cap, this acoustic effect is not accompanied by the undesirable generation of splashes. Furthermore, the system has a wide range of applications, particularly as a flush system or flash tank filling system that utilizes the Venturi effect.

[0071] Naturally, the invention is not limited to the embodiments described above by way of example, but it also includes all technical equivalents of the described means and their modifications and combinations.

Claims

1. A water supply system (1) for a flash tank (101), comprising: At the mounting position, a main body (2) having an air intake (4) at the top; a first pipe (10) provided in the main body (2) and configured to be connected at its upstream end (11) to a water supply network; a second pipe (20) at least partially disposed within the body (2) and having an upstream end (25) in fluid communication with the first pipe (10) through an opening (27) and a downstream end (26) positioned lower than the upstream end (25), the second pipe (20) including an inner bore (24) positioned substantially vertically aligned with the air intake (4), a peripheral edge (28) of the inner bore (24) forming a support surface; a valve (30) attached to the main body (2) and capable of taking a closed state in which the opening (27) is sealed and blocked, or an open state in which the opening (27) is opened, depending on the water level in the tank (101); a closing member (50) that is placed on the support surface (28) to form a communication space (29) between the inside and outside of the second pipe (20) in the inner hole (24) and that is movable between a low position in which the air intake (4) is opened and a high position in which the air intake (4) is closed; The water supply system (1) further comprises a flow control device (40) fixed to the second pipe (20) downstream of the inner bore (24) and generating back pressure when water flows through the system toward the tank (101), wherein the closure member (50) has a density greater than 1.4, thereby preventing it from floating up, and when the valve (30) is opened from an inoperative state of the system in which the flap (32) is in the closed position and the closure member (50) is in the lower position, and water flows into the second pipe (20) by opening the valve (30), the closure member (50) moves to its upper position due to the back pressure generated by the flow control device (40).

2. The water supply system according to claim 1, A water supply system characterized in that the closure member (50) is made of a material selected from the group consisting of stainless steel, glass, aluminum, polyoxymethylene (POM), and filled plastic materials.

3. 3. The water supply system according to claim 1 or 2, A water supply system characterized in that the closure member (50) is a sphere.

4. The water supply system according to claim 3, A water supply system characterized in that the inner bore (24) provided in the second pipe (20) is oval or substantially elliptical.

5. 5. The water supply system according to claim 1, A water supply system characterized in that the movement distance (d) of the closure member (50) between the low position and the high position is greater than half the height (h) of the closure member (50), and preferably greater than the height (h) of the closure member (50).

6. 6. The water supply system according to claim 1, the closure member (50) is disposed in a housing (5) provided in the main body (2), the housing (5) has a bell shape that converges upward, and a lower opening (6) located near the inner hole (24) provided in the second pipe (20); and an upper opening located near or forming said air intake (4).

7. 7. The water supply system according to claim 1, The second pipe (20) has a substantially horizontal first portion (21) having the inner bore (24) and a second portion (22) extending substantially vertically downward therefrom, the inner bore (24) preferably being located near the junction of the first portion (21) and the second portion (22).

8. In the water supply system according to claim 7 which is dependent on claim 4, The water supply system is characterized in that the support surface formed by the inner bore (24) extends in a plane inclined downstream at an angle (α) substantially in the range of 4° to 8° relative to a horizontal plane, and the inner bore (24) has a larger dimension in a direction generally parallel to the axis (A21) of the first portion (21) of the second pipe (20).

9. 9. The water supply system according to claim 1, The water supply system further comprises a cap (52) attached to the main body (2) above the air intake (4), the cap (52) being arranged opposite the air intake (4) and having a channel (55) having a hole opening to the outside of the main body (2), wherein droplets ejected from inside the main body (2) through the air intake (4) enter the channel (52) at the installation position of the system (1) and are guided therein until they fall back into the tank (101).

10. 10. The water supply system according to claim 1, The flow control device (40) has a tip (41) fixed to the downstream end (26) of the second pipe (20), the tip (41) having a converging portion and configured to form part of a suction device (106) using the Venturi effect.

11. 10. The water supply system according to claim 1, The flow control device (40) comprises a sleeve (65) attached to the inside of the second pipe (20), the sleeve (65) including a collection of balls (66) through which water can flow, and a silencer is formed to reduce noise caused by the flow.

12. A toilet (100) comprising a toilet bowl (102), a flush tank (101) and a tank water supply system (1) according to any one of claims 1 to 11.

13. 13. The toilet of claim 12, A flush system (105) comprising: A water supply system (1) according to claim 9, a vertically upward discharge pipe (42) attached to the tip portion (41), the upstream end of the discharge pipe (42) being arranged opposite the downstream end of the tip portion (41), and at least one port (44) being provided between the tip portion (41) and the discharge pipe (42) so that water in the tank (101) can be sucked in by the Venturi effect; a discharge pipe (46) attached to the downstream end of the discharge pipe (42) and directing water toward the toilet bowl (102).

14. 14. The toilet of claim 13, The toilet (100) is characterized in that the flush tank (101) is at substantially the same height as the toilet bowl (102), and the toilet (100) further comprises a flush tank filling system (109) separate from the flush system (105).

15. 13. The toilet of claim 12, A toilet, wherein the water supply system (1) is a water supply system according to claim 11, and wherein the water supply system (1) forms a filling system (110) of the flush tank (101).

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