Anti-siphon device and water tank water inlet device

Abstract

The utility model discloses an anti-siphon device and a water tank water inlet device, the anti-siphon device comprises a shell, the shell is provided with a water inlet, a water outlet and an air inlet, and the air inlet is located on the top wall of the shell; a partition plate extending from bottom to top is arranged in the shell and divides an inner cavity of the shell into a water inlet cavity and a water outlet cavity, and the water inlet cavity and the water outlet cavity are communicated through a gap between the top end of the partition plate and the inner top face of the shell. The water inlet and the air inlet are communicated with the water inlet cavity, and the water outlet is communicated with the water outlet cavity; and an anti-siphon floater is arranged in the water inlet cavity, floats upwards and closes the air inlet when the water inlet cavity is in a water storage state. After water enters the water inlet for the first time, the water inlet cavity can store water and enable the water inlet floater to float upwards, so that the state of closing the air inlet is kept, and the water splashing problem of the air inlet is avoided when water enters the water inlet for the next time.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-siphoning, in particular to an anti-siphoning device and a water tank water inlet device. Background Art

[0002] When the water supply to the tap water pipe is cut off, negative pressure may form in the pipe, and the water in the water tank will enter the tap water pipe through the water inlet valve, forming a siphon. Currently, drinking water and water for flushing sanitary ware usually share a set of tap water pipes, which will cause pollution to the drinking water. For this reason, an anti-siphon structure is usually connected to the downstream of the water inlet valve of the sanitary ware water tank, or an anti-siphon structure is directly set on the water inlet valve of the water tank. The anti-siphon structure of the prior art generally adopts the following structure: it includes a shell and an anti-siphon component. The shell is provided with an air inlet and a water inlet distributed vertically. The anti-siphon component is located between the air inlet and the water inlet. When the water inlet valve is filled with water, the anti-siphon component is pushed upward by the water pressure and closes the air inlet. When the water inlet valve stops filling with water, the anti-siphon component falls by its own weight, thereby opening the air inlet. However, the aforementioned anti-siphon structure has the following drawback: when water enters the water inlet valve, the anti-siphon member takes a while to move from a low position to a high position. This causes a small amount of water to spray out of the air inlet while the anti-siphon member closes the air inlet, resulting in splashing. To address this issue, some anti-siphon structures incorporate a spring to keep the anti-siphon member in a normally closed position, closing the air inlet. However, this introduces a new problem: a greater negative pressure is required to open the anti-siphon member to allow outside air in, ultimately increasing the height of the CL line (i.e., the critical water level line of the water tank) from its highest point. Consequently, the upper headroom of the toilet tank must be very high, limiting the design of the shape. Utility Model Content

[0003] The utility model aims at the technical problems existing in the prior art and provides an anti-siphon device and a water tank water inlet device, which can solve the problem of water splashing through structural improvement and realize the normal closure of the air inlet without setting a spring.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an anti-siphon device, including a shell, which is provided with a water inlet, a water outlet and an air inlet, and the air inlet is located on the top wall of the shell; a partition extending from bottom to top is provided in the shell, and the partition separates the inner cavity of the shell into a water inlet chamber and a water outlet chamber, and the water inlet chamber and the water outlet chamber are connected through the gap between the top end of the partition and the inner top surface of the shell; the water inlet and the air inlet are connected to the water inlet chamber, and the water outlet is connected to the water outlet chamber; an anti-siphon float is provided in the water inlet chamber, and the anti-siphon float floats up when the water inlet chamber is in a water storage state and closes the air inlet.

[0005] Furthermore, the height of the top of the partition is greater than or equal to the height of the portion of the bottom edge of the air inlet that is used to seal with the anti-siphon float; the bottom edge of the air inlet is provided with a water-stop flange that is used to seal with the anti-siphon float, and the bottom end of the water-stop flange constitutes the portion.

[0006] Furthermore, the anti-siphon float includes a float body and a water-stop pad provided on the float body and used for sealingly cooperating with the water-stop flange.

[0007] Furthermore, a vertically arranged guide column is provided in the shell, and the anti-siphon float is hollow and slides onto the guide column, so that the guide column provides guidance for the movement of the anti-siphon float.

[0008] Furthermore, the guide column is arranged on the top wall of the shell and extends downward; the air inlet is coaxially arranged with the guide column.

[0009] Furthermore, a hollow support portion is provided in the air inlet, and the top end of the guide column is integrally formed with the support portion.

[0010] Furthermore, the water inlet is located at the bottom of the water inlet cavity and is provided with an upwardly extending annular boss, the bottom end of the annular boss is at a height less than the top end of the partition, and the anti-siphon float falls on the annular boss when it falls.

[0011] Furthermore, the annular boss is provided with at least one notch, so that the air entering the water inlet cavity from the air inlet flows toward the water inlet through the notch.

[0012] Furthermore, the shell includes an upper cover and a bottom shell with an opening at the upper end. The upper cover is sealed to the upper end opening of the bottom shell and encloses the inner cavity of the shell. The air inlet is provided on the upper cover, and the partition, water inlet and water outlet are respectively provided on the bottom shell.

[0013] The present invention further provides a water tank water inlet device, comprising a water tank, a water inlet valve, and the anti-siphon device as described above in the present invention, wherein the inlet of the water inlet valve is connected to a tap water pipe, the outlet of the water inlet valve is connected to the water inlet, and the water outlet is connected to the water tank.

[0014] Furthermore, the height of the highest water level line of the water tank is less than or equal to the height of the top of the partition; the shell is connected to the valve body of the water inlet valve, or the shell is at least partially integrally formed with the valve body of the water inlet valve.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Since the partition provided in the shell of the present invention separates the inner cavity of the shell into a water inlet chamber and a water outlet chamber, the water inlet chamber and the water outlet chamber are connected through the gap between the top of the partition and the inner top surface of the shell, the water inlet and the air inlet are connected to the water inlet chamber, and the water outlet is connected to the water outlet chamber, and an anti-siphon float is provided in the water inlet chamber. The anti-siphon float floats up and closes the air inlet when the water inlet chamber is in a water storage state, so that after the water inlet is infused with water for the first time, the water inlet chamber of the utility model can store water and cause the water inlet float to float up, thereby keeping the air inlet in a closed state. Therefore, when the water inlet is infused with water next time, there will be no splashing problem at the air inlet.

[0017] 2. The baffle ensures that water flows over it, which helps to increase the CL height. Specifically, the top of the baffle is located at a height greater than or equal to the bottom edge of the air inlet where the anti-siphon float seal mates. This maximizes the CL height without increasing the height of the highest point of the housing, ultimately minimizing the vertical distance between the CL and the highest point of the device.

[0018] 3. The anti-siphon float slides on a downward-facing guide post. This guide structure ensures that no component rises above the highest point of the housing when the anti-siphon float ascends. Therefore, the highest point of the housing becomes the highest point of the device, ultimately helping to minimize the vertical distance between the CL line and the highest point of the device. In particular, the guide post and water-stop flange are built on the same component, ensuring coaxiality and ensuring good contact between the water-stop pad on the anti-siphon float and the water-stop flange, ensuring a reliable seal.

[0019] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and embodiments; however, the anti-siphon device and water tank water inlet device of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded schematic diagram of the anti-siphon device of the present invention;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the bottom shell of the utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the upper cover of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the anti-siphon device of the present invention;

[0024] Figure 5 It is a cross-sectional view of the anti-siphon device of the present utility model;

[0025] Figure 6 This is a cross-sectional view of the anti-siphon device of the utility model after water is firstly introduced;

[0026] Figure 7 This is a cross-sectional view of the anti-siphon device of the utility model in a water-influent state;

[0027] Figure 8 This is a schematic diagram of the utility model in a state where the water level in the water tank is lower than the top of the partition;

[0028] Figure 9 This is a schematic diagram of the utility model in a state where the water level in the water tank is higher than the top of the partition;

[0029] Figure 10 This is a schematic diagram of the present invention when the CL line is at a suitable height;

[0030] In the figure, 1. upper cover; 11. air inlet; 12. water-stop flange; 13. guide column; 14. support part; 2. sealing ring; 3. anti-siphon float; 31. float body; 32. water-stop pad; 4. bottom shell; 41. water inlet; 42. water outlet; 43. partition; 44. water inlet chamber; 45. water outlet chamber; 46. annular boss; 47. notch. DETAILED DESCRIPTION

[0031] In the description of this utility model, the use of terms such as "upper," "lower," "inner," "outer," and "top / bottom" to indicate positions or locations is based on the positions or locations shown in the accompanying drawings and is intended solely to facilitate the description of this utility model. They are not intended to indicate or imply that the device referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limiting the scope of protection of this utility model. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0032] See Figures 1-10 As shown, an anti-siphon device of the present invention includes a housing having a water inlet 41, a water outlet 42, and an air inlet 11, with the air inlet 11 located on the top wall of the housing. A partition 43 extending upward from bottom to bottom is provided within the housing, separating the inner cavity of the housing into a water inlet chamber 44 and a water outlet chamber 45. The water inlet chamber 44 and the water outlet chamber 45 are connected via a gap between the top of the partition 43 and the inner top surface of the housing. The water inlet 41 and the air inlet 11 are respectively connected to the water inlet chamber 44, while the water outlet 42 is connected to the water outlet chamber 45. An anti-siphon float 3 is provided within the water inlet chamber 44. When water is stored in the water inlet chamber 44, the anti-siphon float 3 floats up and closes the air inlet 11.

[0033] The housing specifically includes an upper cover 1 and a bottom shell 4 with an opening at the upper end. The upper cover 1 is sealed to the upper opening of the bottom shell 4 and encloses the inner cavity of the housing. Specifically, the upper cover 1 and the bottom shell 4 are connected by screws, and the connection is sealed by a sealing ring 2. However, the connection method between the upper cover 1 and the bottom shell 4 is not limited to this. In other embodiments, the screw connection method can be replaced by a snap connection, threaded connection, ultrasonic welding, etc. The air inlet 11 is provided on the upper cover 1, and the partition 43, the water inlet 41 and the water outlet 42 are respectively provided on the bottom shell 4. The water inlet 41 is located at the bottom of the water inlet chamber 44 and is opposite to the air inlet 11 in the upper and lower parts. The water outlet 42 is located at the bottom of the water outlet chamber 45. The partition 43 is specifically a vertical straight plate that divides the inner cavity of the bottom shell 4 into two left and right chambers, namely the water outlet chamber 45 and the water inlet chamber 44. In other embodiments, the partition is annular, and the space enclosed by it forms the water inlet chamber, and the portion outside the enclosed space forms the water outlet chamber.

[0034] Furthermore, the height of the top of the partition 43 is greater than or equal to the height of the portion of the bottom edge of the air inlet 11 that seals with the anti-siphon float 3. Specifically, the bottom edge of the air inlet 11 is provided with an annular waterstop flange 12 that seals with the anti-siphon float 3. The bottom end of the waterstop flange 12 constitutes the aforementioned portion. Therefore, the height of the top of the partition 43 is greater than or equal to the height of the bottom end of the waterstop flange 12. Specifically, in this embodiment, the height of the top of the partition 43 is slightly higher than the height of the bottom end of the waterstop flange 12, but this is not limited to this. The anti-siphon float 3 specifically includes a float body 31 and a waterstop pad 32 disposed on the float body 31 and configured to seal with the waterstop flange 12. In this embodiment, the float body 31 comprises a rod-shaped portion and a disc-shaped portion disposed on top of the rod-shaped portion, but the structure of the float body 31 is not limited to this. The waterstop pad 32 is mounted on top of the rod-shaped portion and positioned above the disc-shaped portion.

[0035] As a preferred embodiment, a vertically disposed guide post 13 is provided within the housing. The anti-siphon float 3 is hollow and slides onto the guide post 13, thereby guiding the movement of the anti-siphon float 3. Specifically, the guide post 13 is disposed on the top wall of the housing, i.e., on the upper cover 1, and extends downward. The air inlet 11 is coaxially disposed with the guide post 13. Furthermore, a hollow support portion 14 is disposed within the air inlet 11. The top end of the guide post 13 is integrally formed with the support portion 14. The support portion 14 is specifically, but not limited to, a cross shape.

[0036] In this embodiment, the water inlet 41 is provided with an upwardly extending annular boss 46, the height of the bottom end of the annular boss 46 is less than the height of the top end of the partition 43, and the anti-siphon float 3 falls on the annular boss 46 when it falls, and the annular boss 46 is provided with at least one notch 47, so that when the disc-shaped part of the anti-siphon float 3 falls on the annular boss 46, the notch 47 can be used to connect the water inlet chamber 44 and the water inlet 41.

[0037] The utility model provides an anti-siphon device, which cooperates with a water tank and a water inlet valve when in use. Specifically, the inlet of the water inlet valve is connected to a tap water pipe, the outlet of the water inlet valve is connected to a water inlet 41 of a shell, and the water outlet 42 of the shell is connected to the water tank.

[0038] After the water inlet valve is filled with water for the first time and closed, the water inlet chamber 44 is in a water storage state, and the water storage level is the height of the top of the partition 43. The buoyancy of the anti-siphon float 3 is greater than its own weight and floats up, thereby closing the air inlet 11. Figure 6 As shown. Since the guide column 13 and the water-stop flange 12 are both located in the upper cover 1, their coaxiality can be guaranteed, thereby ensuring that the water-stop pad 32 and the water-stop flange 12 are in good contact at all positions and that there will be no water leakage. Methods for making the buoyancy of the anti-siphon float 3 greater than its own weight include at least the following: (1) using a low-density material to make the anti-siphon float 3, such as PP material, and ensuring that the anti-siphon float 3 is more immersed in water; (2) providing an air chamber in the anti-siphon float 3 to increase the buoyancy; (3) using a part of the structure of the anti-siphon float 3 to make a material with extremely low density to increase the buoyancy. This embodiment adopts method (1).

[0039] The next time the water inlet valve is opened, water flows in from the water inlet 41. Since the anti-siphon float 3 is already in the floating state, the water flows directly from the space below the anti-siphon float 3 into the water inlet chamber 44, then flows over the partition 43 into the water outlet chamber 45, and finally flows out from the water outlet 42. During this process, the water pressure also acts on the anti-siphon float 3, making the anti-siphon float 3 more reliable in sealing.

[0040] During the entire process, the anti-siphon float 3 is always in a state of sealing the air inlet 11 , and there is no process of the anti-siphon float 3 opening and closing the air inlet 11 . Therefore, no water will splash out of the air inlet 11 .

[0041] When the water level in the water tank is low (such as Figure 8 L position shown in the figure), and is lower than the anti-siphon device of the present invention, the final water outlet 42 (after connecting the pipeline) is lower than the water level in the water tank, as shown in the figure. Figure 8As shown. When the water inlet valve is open but there is no tap water, and negative pressure appears in the tap water pipeline, the water in the water inlet chamber 44 on the right side of the partition 43 flows back from the water inlet 41, the water level drops, and the anti-siphon float 3 drops with the water level, allowing air to enter through the air inlet 11 of the upper cover 1. Eventually, the anti-siphon float 3 falls onto the annular boss 46, and the air entering from the air inlet 11 enters the water inlet 41 through the notch 47 on the annular boss 46 and is drawn into the tap water pipeline. Because the air inlet channel (the air inlet 11 is larger) is unobstructed, while the outflow channel is blocked (the notch 47 is very small), the air pressure in the shell cavity is not much different from atmospheric pressure, and the water in the water tank will not be drawn into the tap water pipe through the water outlet 42, thus achieving an anti-siphon effect.

[0042] During the above-mentioned air intake process, if a reset device such as a spring continuously applies a force to the anti-siphon float 3, then a certain negative pressure is required inside the shell to enable the anti-siphon float 3 to open the air inlet 11 and allow the atmosphere to enter. Once there is a negative pressure inside the shell, the water in the water tank will continue to flow in along the water outlet 42 under the pressure difference between the inside and outside. When the pressure difference between the inside and outside reaches a certain level, the water level on the left side of the partition 43 may even exceed the partition 43 and flow into the tap water pipeline through the water inlet 41 until the water level in the water tank drops to a certain position, at which point the pressure difference between the inside and outside is not enough to cause the water level on the left side of the partition 43 to exceed the partition 43. The present utility model does not have a spring or other device. The anti-siphon float 3 floats up only by buoyancy. As long as the water level drops, the anti-siphon float 3 drops with the water level, and gas can easily enter the shell, eliminating the negative pressure inside the shell and ensuring that the air pressure inside the shell is equivalent to the external atmospheric pressure. Even if the water level in the water tank is high, the water in the water tank will not be sucked in, as long as the water level in the water tank is not higher than the top of the partition 43.

[0043] When the water level in the water tank is high (such as Figure 9 L1 position shown in the figure), when the anti-siphon device of the present invention is overflowed (as shown in the figure Figure 9 As shown), when the water inlet valve is opened but there is no tap water and negative pressure appears in the tap water pipeline, the water in the water tank is sucked into the tap water pipeline along the path of the water outlet 42-the top of the partition 43-the bottom of the anti-siphon float 3-the water inlet 41 until the water level in the water tank is lower than the height of the water stop flange 12 of the upper cover 1 (as shown). Figure 9 (as shown at position L2 in the figure), anti-siphon float 3 drops, allowing air to enter the housing through water inlet 41 of upper cover 1, eliminating the negative pressure within the housing. Ultimately, the water level in the tank is slightly lower than the height of water-stop flange 12. Because water outlet 42 is connected to the tank, a communicating vessel is formed inside and outside, and the water level at water outlet 42 is roughly the same as the tank level.

[0044] It can be seen that when the water level in the water tank is high, if the height of the partition 43 is very low, the water in the water tank can still flow into the tap water pipe until the water level in the water tank reaches the height of the top of the partition 43. Therefore, the height of the partition 43 determines the final water level. In this embodiment, since the height of the top of the partition 43 is equal to or slightly higher than the height of the bottom of the water-stop flange 12, the partition 43 is higher than the water level of the left water outlet 42, and the water in the water tank can no longer be sucked into the tap water pipe, thus playing an anti-siphoning role. In this case, the height of the bottom of the water-stop flange 12 determines the water level in the water tank. Therefore, it is not necessary to set the partition 43 too high. It is sufficient as long as the height of the top of the partition 43 is slightly higher than the height of the bottom of the water-stop flange 12. If the partition 43 is set too high, the highest point of the upper cover 1 will also have to rise synchronously to ensure sufficient flow capacity.

[0045] From the above anti-siphon process of the water tank water level being low and high, it can be seen that the CL line (i.e. the critical water level line of the water tank) is approximately at the height of the bottom end of the water stop flange 12 (e.g. Figure 10 As long as the water level in the tank is below this position, there is no risk of it being sucked into the water pipe.

[0046] Since the guide post 13 of the anti-siphon float 3 is facing downward, when the anti-siphon float 3 is floating, no parts exceed the upper surface of the upper cover 1, so the upper surface of the upper cover 1 is the highest point. The height of the CL line from the highest point can be 6mm in this example, and can even be 5mm in some occasions where the water flow rate is not high. When the CL line is limited (it must be at least 25mm above the overflow line), the upper space boundary of the toilet (such as Figure 10 As shown by the thick black horizontal lines in the figure, the boundaries of different installation positions are also different) do not have to be made very high, which significantly improves the freedom of toilet design.

[0047] Therefore, the present invention incorporates a partition 43 between the water inlet 41 and the water outlet 42, forcing water to flow over the partition 43 before it can flow, thereby increasing the CL line height. Specifically, the top of the partition 43 is positioned at a height equal to or slightly higher than the bottom of the water-stop flange 12. This maximizes the CL line height without increasing the height of the highest point of the housing, ultimately minimizing the vertical distance between the CL line and the highest point of the device.

[0048] In this utility model, the anti-siphon float 3 is designed as a hollow structure and slides on a downward-facing guide post 13. With this guide structure, when the anti-siphon float 3 rises, no components rise above the highest point of the upper cover 1. Therefore, the highest point of the upper cover 1 becomes the highest point of the device, ultimately helping to reduce the vertical distance between the CL line and the highest point of the device. The guide post 13 and the waterstop flange 12 are both located on the upper cover 1, ensuring their coaxiality, allowing the waterstop pad 32 to contact the waterstop flange 12 effectively, ensuring a reliable seal.

[0049] When the anti-siphon device is installed downstream of the normally closed inlet valve, the partition 43 also allows the right water inlet 41 section to be filled with water. The anti-siphon float 3 is designed so that its own weight is less than its buoyancy, allowing it to float in the accumulated water created by the partition 43. The anti-siphon float 3 has a hollow, upward-facing rod-shaped portion, which significantly increases its submerged volume and ensures sufficient buoyancy. Ultimately, after water inlet is enabled, the anti-siphon float 3 does not undergo a transition from open to closed, preventing splashing.

[0050] The utility model provides a water tank water inlet device, comprising a water tank, a water inlet valve, and also comprising the anti-siphon device of the utility model described above. The inlet of the water inlet valve is connected to the tap water pipe, the outlet of the water inlet valve is connected to the water inlet 41 of the shell, and the water outlet 42 of the shell is connected to the water tank.

[0051] In this embodiment, the height of the highest water level of the water tank is less than or equal to the height of the top of the partition 43. The housing is connected to the valve body of the water inlet valve, or the housing is at least partially integrally formed with the valve body of the water inlet valve.

[0052] Regarding the structure and working principle of the anti-siphon device, please refer to the previous description thereof, which will not be repeated here.

[0053] The utility model provides an anti-siphon device and a water tank water inlet device, and the unrelated parts are the same as those in the prior art or can be implemented by using the prior art.

[0054] The above embodiments are only used to further illustrate an anti-siphon device and a water tank water inlet device of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the technical solution of the present invention.

Claims

1. An anti-siphon device comprising a housing having a water inlet, a water outlet, and an air inlet, wherein the air inlet is located on the top wall of the housing; characterized in that: A partition extending from bottom to top is provided in the shell, which separates the inner cavity of the shell into a water inlet chamber and a water outlet chamber. The water inlet chamber and the water outlet chamber are connected through the gap between the top end of the partition and the inner top surface of the shell; the water inlet and the air inlet are connected to the water inlet chamber, and the water outlet is connected to the water outlet chamber; an anti-siphon float is provided in the water inlet chamber, and the anti-siphon float floats up when the water inlet chamber is in a water storage state and closes the air inlet.

2. The anti-siphon device according to claim 1, characterized in that: The height of the top of the partition is greater than or equal to the height of the portion of the bottom edge of the air inlet that is used to seal with the anti-siphon float; the bottom edge of the air inlet is provided with a water-stop flange that is used to seal with the anti-siphon float, and the bottom end of the water-stop flange constitutes the portion.

3. The anti-siphon device according to claim 2, characterized in that: The anti-siphon float comprises a float body and a water-stop pad which is arranged on the float body and is used for sealing with the water-stop flange.

4. The anti-siphon device according to claim 1, characterized in that: A vertically arranged guide column is provided in the shell. The anti-siphon float is hollow and is slidably sleeved on the guide column, so that the guide column provides guidance for the movement of the anti-siphon float.

5. The anti-siphon device according to claim 4, characterized in that: The guide column is arranged on the top wall of the shell and extends downward; the air inlet is coaxially arranged with the guide column.

6. The anti-siphon device according to claim 5, characterized in that: A hollow support portion is provided in the air inlet, and the top end of the guide column is integrally formed with the support portion.

7. The anti-siphon device according to claim 1, characterized in that: The water inlet is located at the bottom of the water inlet cavity and is provided with an upwardly extending annular boss. The height of the bottom end of the annular boss is less than the height of the top end of the partition. The anti-siphon float falls on the annular boss when it falls.

8. The anti-siphon device according to claim 7, characterized in that: The annular boss is provided with at least one notch, so that the air entering the water inlet cavity from the air inlet flows toward the water inlet through the notch.

9. The anti-siphon device according to claim 1, characterized in that: The shell includes an upper cover and a bottom shell with an opening at the upper end. The upper cover is sealed to the upper end opening of the bottom shell and encloses the inner cavity of the shell. The air inlet is provided on the upper cover, and the partition, water inlet and water outlet are respectively provided on the bottom shell.

10. A water tank water inlet device, comprising a water tank and a water inlet valve, characterized in that: It also includes an anti-siphon device according to any one of claims 1 to 9, wherein the inlet of the water inlet valve is connected to a tap water pipe, the outlet of the water inlet valve is connected to the water inlet, and the water outlet is connected to a water tank.

11. The water tank water inlet device according to claim 10, characterized in that: The height of the highest water level line of the water tank is less than or equal to the height of the top of the partition; the shell is connected to the valve body of the water inlet valve, or the shell is at least partially integrally formed with the valve body of the water inlet valve.

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