Anti-siphon structure of closestool water tank

Abstract

The utility model discloses a closestool water tank anti-siphon structure which comprises an anti-siphon body used on a sunken sealed closestool water tank, the sealed closestool water tank is provided with a water inlet valve and a drainage pump, and the water inlet valve is communicated with a water source device and used for opening and closing the water source device to feed water into the sealed closestool water tank. The drainage pump is used for pumping water from the sealed closestool water tank to the closestool pool, the anti-siphon body is connected to a water path between the water inlet valve and the water source device in series or connected to a water path communicating the water inlet valve and the sealed closestool water tank in series, and the anti-siphon body is installed outside the sealed closestool water tank. And an anti-siphon air inlet hole higher than the highest water level in the sealed closestool water tank is formed. The anti-siphon structure for sealing the closestool water tank is more reliable.

Description

Technical Field

[0001] This utility model relates to the field of toilet technology, and in particular to an anti-siphon structure for toilet tanks. Background Technology

[0002] Traditional toilets have their water tanks located above the toilet bowl, higher than the bowl itself. When flushing, the water in the tank is pushed downwards into the toilet bowl using gravity, thus flushing the bowl. However, the smart toilets that are currently popular in the market generally adopt a recessed, sealed water tank design. This means that the water tank is a sealed structure installed at the rear of the toilet bowl. Water enters the sealed water tank through an inlet valve, and when flushing, an electric pump draws the water from the tank into the toilet bowl. For example, Chinese utility model patent with publication number CN215519025U, entitled "A Sealed Water Tank," uses this structure.

[0003] Traditional toilet tanks typically have an anti-siphon structure on the inlet valve inside the tank. This structure draws in air through the anti-siphon air inlet when negative pressure occurs in the household water network, preventing water from the toilet tank from being drawn back into the network. Current submerged, sealed tank designs still place the anti-siphon structure inside the tank, leading to the following problem: if the toilet inlet valve fails and water continues to flow into the tank, the water will submerge the anti-siphon structure, causing it to fail and unable to draw in air.

[0004] Therefore, there is a current need in this field for a more reliable anti-siphon structure for toilet tanks that can be applied to sunken, sealed water tanks. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-siphon structure for toilet tanks, and the technical problem to be solved is how to make the anti-siphon structure on sealed toilet tanks more reliable.

[0006] To achieve the above objectives, the solution of this utility model is as follows: an anti-siphon structure for a toilet tank, including an anti-siphon body, used on a sunken sealed toilet tank. The sealed toilet tank is equipped with an inlet valve and a drain pump. The inlet valve is connected to a water source device and is used to open and close the water source device to supply water to the sealed toilet tank. The drain pump is used to pump water from the sealed toilet tank to the toilet bowl. The anti-siphon body is connected in series in the water path between the inlet valve and the water source device, or connected in series in the water path between the inlet valve and the sealed toilet tank. The anti-siphon body is installed outside the sealed toilet tank and is provided with an anti-siphon air inlet hole that is higher than the highest water level inside the sealed toilet tank.

[0007] Furthermore, the anti-siphon body has a fixed part and a lifting part. The fixed part is fixedly installed outside the sealed toilet tank, and the lifting part is lifted and lowered on the fixed part and can be fixed at different heights of the fixed part. The anti-siphon air inlet is opened on the lifting part.

[0008] Furthermore, the anti-siphon body and the inlet valve are mounted on a mounting piece. The top of the sealed toilet tank has an installation opening. The mounting piece is in the shape of an inverted bowl and is installed on the installation opening in a downward sealing manner. The inlet valve is located inside the bowl shape of the mounting piece, and the anti-siphon body is located outside the bowl shape of the mounting piece.

[0009] Furthermore, an upward-flush nozzle is provided at the top of the toilet bowl, and the sealed toilet tank overflows through the upward-flush nozzle. The anti-siphon air inlet is higher than the upward-flush nozzle.

[0010] Furthermore, the anti-siphon body is provided with an anti-siphon core and has an anti-siphon water inlet end, an anti-siphon water outlet end, an anti-siphon water passage cavity, and an anti-siphon air inlet. The anti-siphon water inlet end and the anti-siphon water outlet end are connected through the anti-siphon water passage cavity. The anti-siphon air inlet connects the anti-siphon water passage cavity to the outside of the anti-siphon body. The anti-siphon core is movably disposed in the anti-siphon water passage cavity, facing the anti-siphon air inlet, and is used to open the anti-siphon air inlet. The anti-siphon air inlet is only blocked when the water flows from the anti-siphon water inlet end to the anti-siphon water outlet end under positive pressure.

[0011] The anti-siphon inlet is connected to the water source device, the anti-siphon outlet is connected to the inlet of the inlet valve, and the outlet of the inlet valve is connected to the sealed toilet tank, so that the anti-siphon body is connected in series in the water path between the inlet valve and the water source device.

[0012] Alternatively, the inlet end of the inlet valve is connected to the water source device, the outlet end of the inlet valve is connected to the inlet end of the anti-siphon valve, and the outlet end of the anti-siphon valve is connected to the sealed toilet tank, so that the anti-siphon body is connected in series in the water path between the inlet valve and the sealed toilet tank.

[0013] Furthermore, the anti-siphon body has a fixed part and a lifting part. The fixed part is fixedly installed outside the sealed toilet tank. The fixed part is provided with a fixed part inlet pipe and a fixed part outlet pipe. The lifting part is provided with a lifting part inlet pipe and a lifting part outlet pipe that are interconnected. The anti-siphon inlet end is opened at one end of the fixed part inlet pipe, and the lifting part inlet pipe is longitudinally movably inserted into the other end of the fixed part inlet pipe. The anti-siphon outlet end is opened at one end of the fixed part outlet pipe, and the lifting part outlet pipe is longitudinally movably inserted into the other end of the fixed part outlet pipe, so that the lifting part can move up and down on the fixed part.

[0014] Furthermore, it also includes cards;

[0015] In the fixed part water inlet pipe and the lifting part water inlet pipe, a card slot is provided through one side wall on the outer side, and multiple card slots are arranged longitudinally on one side wall on the inner side. The card is used to detachably attach to the card slot. After being attached to the card slot, the card passes through the card slot and is inserted into one of the card slots.

[0016] And / or, in the water outlet pipe of the fixed part and the water outlet pipe of the lifting part, a card slot is provided through one side wall on the outer side, and multiple card slots are arranged longitudinally on one side wall on the inner side. The card is used to be detachably attached to the card slot. After being attached to the card slot, the card passes through the card slot and is inserted into one of the card slots.

[0017] This allows the lifting unit to be fixed at different heights from the fixed unit.

[0018] Furthermore, the anti-siphon air inlet is located at the top of the anti-siphon body, and the anti-siphon water passage cavity has a longitudinal extension section directly below the anti-siphon air inlet. The anti-siphon core is longitudinally slidably disposed within the longitudinal extension section so that when water flows from the anti-siphon inlet end to the anti-siphon outlet end under positive pressure, the water flow in the longitudinal extension section flows upward, causing the water flow to push the anti-siphon core upward, causing the anti-siphon core to slide upward and block the anti-siphon air inlet.

[0019] Furthermore, the anti-siphon core has a through-hole, through which water flows from the anti-siphon inlet end into the anti-siphon through-hole and then flows towards the anti-siphon outlet end.

[0020] Furthermore, the water inlet valve is a buoyancy control valve installed inside the sealed toilet tank.

[0021] Furthermore, the water inlet valve is a solenoid valve installed outside the sealed toilet tank.

[0022] The beneficial effects of this utility model after adopting the above solution are as follows: the anti-siphon body is connected in series in the water circuit between the inlet valve and the water source device, or in series in the water circuit between the inlet valve and the sealed toilet tank. The anti-siphon body is installed outside the sealed toilet tank and is provided with an anti-siphon air inlet hole that is higher than the highest water level in the sealed toilet tank. Therefore, even if the inlet valve fails and the water in the toilet tank submerges the inlet valve, and a negative pressure is generated in the water source device, the anti-siphon body is installed outside the sealed toilet tank, which can still ensure that the anti-siphon air inlet hole can still draw in air, break the siphon, and prevent the water source device from sucking back the water in the sealed toilet tank. Attached Figure Description

[0023] Figure 1 A structural diagram showing the anti-siphon body installed outside the sealed toilet tank in an embodiment where a buoyancy control valve is installed;

[0024] Figure 2A three-dimensional structural diagram to prevent the siphon body from being in a water-inlet state after being connected to the buoyancy control valve;

[0025] Figure 3 A partial cross-sectional structural diagram of the anti-siphon body under water ingress conditions;

[0026] Figure 4 A partial cross-sectional structural diagram of the anti-siphon body's anti-siphon air inlet in the air intake state;

[0027] Figure 5 This is a schematic diagram of the connection structure between the fixed part and the lifting part;

[0028] Figure 6 A cross-sectional view of the anti-siphon body installed outside the sealed toilet tank in an embodiment for setting up a solenoid valve;

[0029] Figure 7 for Figure 6 A magnified view of a section at point A in the middle;

[0030] Figure 8 Structural diagram showing the installation components removed from the sealed toilet tank;

[0031] Figure 9 This is a schematic diagram of an upward-flush nozzle installed on a toilet bowl.

[0032] Label Explanation: 1-Anti-siphon body, 2-Anti-siphon core, 3-Sealed toilet tank, 5-Inlet valve inlet end, 6-Inlet valve outlet end, 7-Anti-siphon inlet end, 8-Anti-siphon outlet end, 9-Anti-siphon water passage cavity, 10-Anti-siphon air inlet, 11-Longitudinal extension section, 12-Water passage hole, 13-Fixing part, 14-Lifting part, 15-Fixing part inlet pipe, 16-Fixing part outlet pipe, 17-Lifting part inlet pipe, 18-Lifting part outlet pipe, 19-Card, 20-Card slot, 21-Card slot, 22-Buoyancy control valve, 23-Solenoid valve, 24-Float, 25-Level sensor, 26-Sealing gasket, 27-Mounting base, 28-Drain pump, 29-Mounting component, 30-Top flush nozzle, 31-Mounting port. Detailed Implementation

[0033] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Unless otherwise expressly defined, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" in the claims, description, and accompanying drawings of this invention is merely for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0035] This utility model provides an anti-siphon structure for a toilet tank, such as Figure 1-9 As shown, the device includes an anti-siphon body 1, used on a recessed sealed toilet tank 3. The sealed toilet tank 3 has a sealed design and is used for water storage. The sealed toilet tank 3 is equipped with an inlet valve and a drain pump 28. The inlet valve is connected to a water source device (usually a household water network) and is used to open and close the water supply from the water source device to the sealed toilet tank 3. The drain pump 28 is used to pump water from the sealed toilet tank 3 to the toilet bowl for flushing. The anti-siphon body 1 is connected in series in the water path between the inlet valve and the water source device, or in series in the water path connecting the inlet valve and the sealed toilet tank 3. The anti-siphon body 1 is installed outside the sealed toilet tank 3 and has an anti-siphon air inlet 10 that is higher than the highest water level inside the sealed toilet tank 3. The anti-siphon air inlet 10 is used to prevent water from entering the sealed toilet tank from the water source device. When negative pressure occurs in the water passage between the water tanks 3, air is drawn into the water passage, disrupting the siphon and preventing water in the sealed toilet tank 3 from being drawn back into the water source device. Thus, by adopting the above solution, it is possible to effectively prevent the water in the sealed toilet tank 3 from overflowing the anti-siphon air inlet 10, causing the anti-siphon function to fail. More preferably, the upper part of the toilet bowl is provided with an upward-flush nozzle 30. The overflow of the sealed toilet tank 3 through the upward-flush nozzle 30 (this is a common technical means in the art) means that when flushing, the water from the upward-flush nozzle 30 plays a role in flushing the side wall of the toilet bowl. When the water inlet valve of the sealed toilet tank 3 fails and water continues to flow in, the water flow can be pushed from the upward-flush nozzle 30 into the toilet bowl by the water pressure (i.e., overflow). The anti-siphon air inlet 10 is higher than the upward-flush nozzle 30, more preferably more than 5 mm higher.

[0036] Specifically, in this embodiment, the water inlet valve has a water inlet end 5 and a water outlet end 6. The water inlet valve is used to open and close the connection between the water inlet end 5 and the water outlet end 6. The specific structure and installation position of the water inlet valve are not limited. It can be a buoyancy control valve 22 installed in the sealed toilet tank 3, equipped with a float 24. The float 24 rises and falls by the change in the water level in the sealed toilet tank 3 to control the buoyancy control valve 22 to switch the water on and off. Alternatively, it can be a solenoid valve 23 installed outside the sealed toilet tank 3, equipped with a liquid level sensor 25 installed in the sealed toilet tank 3. The liquid level sensor 25 collects the water level in the sealed toilet tank 3 to control the solenoid valve 23 to switch the water on and off. The above-mentioned water inlet valves are all conventional designs in this art, and will not be further described in detail in this embodiment.

[0037] Specifically, in this embodiment, the anti-siphon body 1 is provided with an anti-siphon core 2. The anti-siphon body 1 has an anti-siphon water inlet end 7, an anti-siphon water outlet end 8, an anti-siphon water passage cavity 9, and an anti-siphon air inlet 10. The anti-siphon water inlet end 7 and the anti-siphon water outlet end 8 are connected through the anti-siphon water passage cavity 9. The anti-siphon air inlet 10 connects the anti-siphon water passage cavity 9 to the outside of the anti-siphon body 1. The anti-siphon core 2 is movably disposed in the anti-siphon water passage cavity 9, facing the anti-siphon air inlet 10, and is used to open the anti-siphon air inlet 10. It only blocks the anti-siphon air inlet 10 when water flows from the anti-siphon water inlet end 7 to the anti-siphon water outlet end 8 under positive pressure. The specific matching structure between the anti-siphon air inlet 10 and the anti-siphon core 2 is not limited. Any existing anti-siphon structure of toilet tank can be used, as long as it can achieve the above functions. The preferred structure used in this embodiment is given later.

[0038] The anti-siphon body 1 and the inlet valve can be connected in two specific ways: First, the anti-siphon body 1 is connected in series in the water path between the inlet valve and the water source device, meaning the anti-siphon inlet end 7 is connected to the water source device, the anti-siphon outlet end 8 is connected to the inlet valve inlet end 5, and the inlet valve outlet end 6 is connected to the sealed toilet tank 3. Second, the anti-siphon body 1 is connected in series in the water path between the inlet valve and the sealed toilet tank 3, meaning the inlet valve inlet end 5 is connected to the water source device, and the inlet valve outlet end 6 is connected to the anti-siphon inlet end 7. The anti-siphon outlet 8 is connected to the sealed toilet tank 3. The specific installation method can be selected based on the installation space and actual needs, and is not limited. Specifically, in this embodiment, when the inlet valve is a buoyancy control valve 22, the inlet end 7 of the inlet valve is usually located at the rear of the sealed toilet tank 3 and extends out of the sealed toilet tank 3, resulting in limited installation space at the rear of the sealed toilet tank 3. Therefore, the second connection method is adopted. In the embodiment where the inlet valve is a solenoid valve 23, the first connection method is adopted.

[0039] Preferably, in this embodiment, the anti-siphon body 1 and the inlet valve are mounted on a mounting piece 29. The top of the sealed toilet tank 3 has an installation port 31. The mounting piece 29 is in the shape of an inverted bowl and is installed on the installation port 31 with a downward sealing fastening. The inlet valve is located inside the bowl shape of the mounting piece 29, and the anti-siphon body 1 is located outside the bowl shape of the mounting piece 29, so as to facilitate disassembly and installation.

[0040] Specifically, in this embodiment, the cooperation structure between the anti-siphon core 2 and the anti-siphon air inlet 10 is as follows: the anti-siphon air inlet 10 is located at the top of the anti-siphon body 1, and the anti-siphon water passage cavity 9 has a longitudinal extension section 11 directly below the anti-siphon air inlet 10. The outer contour size of the cross-section of the anti-siphon core 2 matches the pipe diameter of the longitudinal extension section 11. The anti-siphon core 2 is longitudinally slidably disposed within the longitudinal extension section 11 so that when water flows from the anti-siphon inlet end 7 to the anti-siphon outlet end 8 under positive pressure, the water flow in the longitudinal extension section 11 flows upward, causing the water flow to push the anti-siphon core 2 upward, causing the anti-siphon core 2 to slide upward and block the anti-siphon air inlet 10. When water does not flow from the anti-siphon inlet end 7 to the anti-siphon outlet end 8, the anti-siphon core 2 slides down under the action of gravity, opening the anti-siphon air inlet 10. At this time, the anti-siphon water passage cavity 9 is connected to the outside to prevent siphoning. In order to provide sufficient force to the anti-siphon core 2 so that it can block the anti-siphon air inlet 10 after sliding up, the anti-siphon core 2 has a water passage hole 12. The water flow from the anti-siphon water inlet end 7 into the anti-siphon water passage cavity 9 flows through the water passage hole 12 and then flows to the anti-siphon water outlet end 8. Preferably, the top of the anti-siphon core 2 is also provided with a sealing gasket 26 for sealing the anti-siphon air inlet 10 to better seal the anti-siphon air inlet 10.

[0041] In a preferred embodiment, to improve versatility when matching different toilet tanks and inlet valves, the anti-siphon body 1 has a fixed part 13 and a lifting part 14. The fixed part 13 is fixedly installed outside the sealed toilet tank 3, and the lifting part 14 is lifted and lowered on the fixed part 13 and can be fixed at different heights on the fixed part 13. The anti-siphon air inlet 10 is opened on the lifting part 14, and the specific structure of the lifting and fixing is not limited. Specifically, in this embodiment, the fixed part 13 is provided with a fixed part inlet pipe 15 and a fixed part outlet pipe 16. Specifically, the fixed part inlet pipe 15 and the fixed part outlet pipe 16 are both L-shaped, extending horizontally for a certain distance and then extending vertically upward. The lifting part 14 is provided with a lifting part inlet pipe 17 and a lifting part outlet pipe 18 that are interconnected. Specifically, the lifting part inlet pipe 17 and the lifting part outlet pipe 18 are arranged in parallel, extending vertically, and their top ends are connected to a mounting base 27. The lifting part inlet pipe 17 and the lifting part outlet pipe 18 are connected from the mounting base 27 at the top. The anti-siphon inlet end 7 is opened at one end of the horizontal extension side of the fixed part inlet pipe 15. The bottom end of the lifting part inlet pipe 17 is longitudinally and movably inserted into the top end of the fixed part inlet pipe 15. The anti-siphon outlet end 8 is opened at one end of the horizontal extension side of the fixed part outlet pipe 16. The bottom end of the lifting part outlet pipe 18 is longitudinally and movably inserted into the top end of the fixed part outlet pipe 16, so that the lifting part 14 can rise and fall on the fixed part 13.

[0042] It also includes a card 19; in the fixed part water inlet pipe 15 and the lifting part water inlet pipe 17, a card slot 20 is provided through one of the outer side walls, and a plurality of card slots 21 are arranged longitudinally on one of the inner side walls. The card 19 is used to detachably snap onto the card slot 20. After snapping onto the card slot 20, it passes through the card slot 20 and is inserted into one of the card slots 21. In the fixed part water outlet pipe 16 and the lifting part water outlet pipe 18, a card slot 20 is provided through one of the outer side walls, and a plurality of card slots 21 are arranged longitudinally on one of the inner side walls. 9 is used for detachable snap-fit ​​onto card slot 20. After snap-fitting onto card slot 20, it passes through card slot 20 and is inserted into one of the card slots 21 to fix the lifting part 14 at different heights of the fixing part 13. Of course, it can also be configured to snap-fit ​​and fix only the water inlet pipe 15 of the fixing part and the water inlet pipe 17 of the lifting part, or only the water outlet pipe 16 of the fixing part and the water outlet pipe 18 of the lifting part, and is not limited thereto. Specifically, in this embodiment, the design is adopted in which the water inlet pipe 17 of the lifting part is inserted into the water inlet pipe 15 of the fixing part, and the water outlet pipe 18 of the lifting part is inserted into the water outlet pipe 16 of the fixing part.

[0043] The above description is only a preferred embodiment of this utility model and is not a limitation on the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A toilet tank anti-siphon structure, characterized in that: The device includes an anti-siphon body (1) used on a sunken sealed toilet tank (3). The sealed toilet tank (3) is equipped with an inlet valve and a drain pump (28). The inlet valve is connected to a water source device and is used to open and close the water source device to supply water to the sealed toilet tank (3). The drain pump (28) is used to pump water from the sealed toilet tank (3) to the toilet bowl. The anti-siphon body (1) is connected in series in the water path between the inlet valve and the water source device, or in series in the water path between the inlet valve and the sealed toilet tank (3). The anti-siphon body (1) is installed outside the sealed toilet tank (3) and is provided with an anti-siphon air inlet (10) that is higher than the highest water level in the sealed toilet tank (3).

2. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The anti-siphon body (1) has a fixed part (13) and a lifting part (14). The fixed part (13) is fixedly installed outside the sealed toilet tank (3). The lifting part (14) is lifted and installed on the fixed part (13) and can be fixed at different heights of the fixed part (13). The anti-siphon air inlet (10) is opened on the lifting part (14).

3. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The anti-siphon body (1) and the inlet valve are mounted on a mounting piece (29). The top of the sealed toilet tank (3) has an installation port (31). The mounting piece (29) is in the shape of an inverted bowl and is installed on the installation port (31) with a downward sealing fastening. The inlet valve is located inside the bowl shape of the mounting piece (29), and the anti-siphon body (1) is located outside the bowl shape of the mounting piece (29).

4. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The toilet bowl is provided with an upward-flush nozzle (30) at the top, and the sealed toilet tank (3) overflows through the upward-flush nozzle (30). The anti-siphon air inlet (10) is higher than the upward-flush nozzle (30).

5. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The anti-siphon body (1) is provided with an anti-siphon core (2) and has an anti-siphon water inlet (7), an anti-siphon water outlet (8), an anti-siphon water passage cavity (9), and an anti-siphon air inlet (10). The anti-siphon water inlet (7) and the anti-siphon water outlet (8) are connected through the anti-siphon water passage cavity (9). The anti-siphon air inlet (10) connects the anti-siphon water passage cavity (9) to the outside of the anti-siphon body (1). The anti-siphon core (2) is movably installed in the anti-siphon water passage cavity (9) and faces the anti-siphon air inlet (10). It is used to open the anti-siphon air inlet (10) and only blocks the anti-siphon air inlet (10) when the water flows from the anti-siphon water inlet (7) to the anti-siphon water outlet (8) under positive pressure. The anti-siphon inlet (7) is connected to the water source device, the anti-siphon outlet (8) is connected to the inlet valve inlet (5), and the inlet valve outlet (6) is connected to the sealed toilet tank (3) so that the anti-siphon body (1) is connected in series in the water path between the inlet valve and the water source device. Alternatively, the inlet end (5) of the inlet valve is connected to the water source device, the outlet end (6) of the inlet valve is connected to the anti-siphon inlet end (7), and the anti-siphon outlet end (8) is connected to the sealed toilet tank (3), so that the anti-siphon body (1) is connected in series in the water path between the inlet valve and the sealed toilet tank (3).

6. The anti-siphon structure for a toilet tank as described in claim 5, characterized in that: The anti-siphon body (1) has a fixed part (13) and a lifting part (14). The fixed part (13) is fixedly installed outside the sealed toilet tank (3). The fixed part (13) is provided with a fixed part inlet pipe (15) and a fixed part outlet pipe (16). The lifting part (14) is provided with a lifting part inlet pipe (17) and a lifting part outlet pipe (18) that are interconnected. The anti-siphon inlet end (7) is opened at one end of the fixed part inlet pipe (15). The lifting part inlet pipe (17) is longitudinally movably inserted into the other end of the fixed part inlet pipe (15). The anti-siphon outlet end (8) is opened at one end of the fixed part outlet pipe (16). The lifting part outlet pipe (18) is longitudinally movably inserted into the other end of the fixed part outlet pipe (16) so that the lifting part (14) can rise and fall on the fixed part (13).

7. The anti-siphon structure for a toilet tank as described in claim 6, characterized in that: It also includes cards (19); In the fixed part water inlet pipe (15) and the lifting part water inlet pipe (17), a card slot (20) is provided through one side wall on the outer side, and multiple card slots (21) are arranged longitudinally on one side wall on the inner side. The card (19) is used to be detachably attached to the card slot (20). After being attached to the card slot (20), it passes through the card slot (20) and is inserted into one of the card slots (21). And / or, in the fixed part water outlet pipe (16) and the lifting part water outlet pipe (18), a card slot (20) is provided through one side wall on the outer side, and a plurality of card slots (21) are arranged longitudinally on one side wall on the inner side. The card (19) is used to be detachably snapped into the card slot (20). After being snapped into the card slot (20), it passes through the card slot (20) and is inserted into one of the card slots (21). The lifting part (14) can be fixed at different heights of the fixing part (13).

8. The anti-siphon structure for a toilet tank as described in claim 5, characterized in that: The anti-siphon air inlet (10) is located at the top of the anti-siphon body (1). The anti-siphon water passage cavity (9) has a longitudinal extension section (11) directly below the anti-siphon air inlet (10). The anti-siphon core (2) is longitudinally slidably disposed in the longitudinal extension section (11). When the water inlet end (7) of the anti-siphon water outlet end (8) is under positive pressure, the water flow in the longitudinal extension section (11) flows upward, causing the water flow to push the anti-siphon core (2) upward, so that the anti-siphon core (2) slides upward to block the anti-siphon air inlet (10).

9. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The inlet valve is a buoyancy control valve (22) installed inside the sealed toilet tank (3).

10. The anti-siphon structure for a toilet tank as described in claim 1, characterized in that: The water inlet valve is a solenoid valve (23) installed outside the sealed toilet tank (3).

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