Air isolation water tank structure for preventing backflow pollution of intelligent toilet

Abstract

This invention relates to the field of toilet technology and discloses an air-isolated water tank structure for preventing backflow contamination in a smart toilet. The structure includes a flushing tank (1) and a cleaning tank (2). The cleaning tank (2) has an overflow outlet (21) at its upper part, and the flushing tank (1) has an inlet (11) at its upper part, located below the overflow outlet (21). The flushing tank (1) is connected to a flushing water path (12) and uses the flushing water path (12) to clean the toilet. The cleaning tank (2) is connected to a body cleaning component and cleans the user's body. This improved design not only saves on a water supply line and achieves air isolation through a non-contact overflow structure, ensuring the cleanliness of the tap water pipe, but also ensures that the water used for body cleaning can be replaced with fresh tap water at any time, preventing the water in the cleaning tank from deteriorating and becoming contaminated after prolonged disuse of the cleaning function.

Description

Technical Field

[0001] This invention relates to the field of toilet equipment technology, and in particular to an air-isolated water tank structure for preventing backflow contamination in smart toilets. Background Technology

[0002] Existing toilet tank technology is mainly divided into two categories: flush tanks and cleaning tanks. These two types are functionally independent but structurally complementary, together forming the core water supply system of modern toilets. As a traditional basic component, the flush tank mostly adopts a gravity-flush design. It mainly consists of a tank body, inlet valve, drain valve, float ball or water level sensor, flush button, and overflow structure. Its working principle is that tap water is automatically replenished to the set water level. After pressing the flush button, the drain valve opens, and the water in the tank is quickly discharged under gravity, using siphon or direct flushing principles to flush away waste. Currently, mainstream products have achieved segmented control of water volume, and some low-water-pressure scenarios are also equipped with booster pumps or auxiliary pressurization structures to ensure stable flushing force. At the same time, water-saving effects are achieved through optimized water circuit and volume design. Cleaning tanks are commonly found in smart toilets. They are independent, sealed water storage units with separate water supply from the flushing system to avoid cross-contamination. They typically integrate water level detection, heating modules, filtration devices, and anti-backflow structures. They can heat the stored clean water at a constant temperature, perform preliminary filtration, or antibacterial treatment, providing a stable and hygienic water source for functions such as posterior washing, feminine washing, and nozzle self-cleaning. Some high-end models also have water temperature adjustment, water volume control, and water shortage protection functions, which precisely adjust the water flow and pressure through electronically controlled valves.

[0003] EN 1717 is a general European standard for preventing contamination and backflow of drinking water. It applies to water supply and drainage systems and water-related installations, with the core objective of ensuring drinking water safety. To comply with this standard, common technologies include a built-in vacuum breaker in the inlet valve, a backflow prevention check valve on the hose, and double protection against sewage backflow. In addition, smart toilets separate the cleaning tank and flushing water supply to prevent cross-contamination.

[0004] However, the above structure is complex and costly, so it is necessary to design an energy-saving, environmentally friendly and low-cost product. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an air-isolated water tank structure for preventing backflow contamination in smart toilets.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An air-isolated water tank structure for preventing backflow contamination in a smart toilet includes a flushing tank and a cleaning tank. The cleaning tank has an overflow outlet at its upper part, and the flushing tank has an inlet at its upper part, located below the overflow outlet. The flushing tank is connected to a flushing water path and uses the flushing water path to clean the toilet. The cleaning tank is connected to a body cleaning component and cleans the body of the toilet user.

[0007] Preferably, the bottom of the cleaning tank is higher than the top of the flush tank. This suspended structure effectively prevents water from flowing back into the cleaning tank in extreme cases.

[0008] Preferably, the flush tank has an opening at the top, with the inlet being the opening at the top of the flush tank; the projection of the inlet on the horizontal plane covers the projection of the overflow outlet on the horizontal plane.

[0009] Preferably, the system also includes a water valve assembly and a connecting water pipe. The municipal water supply pipe is connected to the inlet of the water valve assembly, and the outlet of the water valve assembly is connected to the connecting water pipe. The connecting water pipe works with the cleaning water tank to transport water to the cleaning water tank.

[0010] Preferably, the cleaning water tank has an opening at the top, with an overflow outlet at the top and the water outlet of the connecting pipe located above the cleaning water tank. The end of the water outlet of the connecting pipe and the horizontal plane where the top opening of the cleaning water tank is located (i.e., the highest water level line stored in the cleaning water tank) are fitted together with a clearance.

[0011] Preferably, the overflow port is located on the side wall of the upper part of the cleaning water tank, and the end of the water pipe outlet is fitted with the horizontal plane where the overflow port is located (i.e., the highest water level line stored in the cleaning water tank).

[0012] Preferably, the overflow port has a non-circular opening in cross-section.

[0013] Preferably, a water level sensor is installed on the upper side wall of the flush tank. When the water level in the flush tank reaches the set value, the water level sensor is triggered, and at the same time, the water valve assembly controls the municipal tap water pipe to enter, thereby preventing the water in the flush tank from overflowing.

[0014] Preferably, the toilet also includes the toilet body, with the flush tank and the cleaning tank both embedded in the rear of the toilet body.

[0015] The present invention has significant technical effects due to the adoption of the above technical solutions: After the improvement of this application, not only can one water supply device be saved, but the air isolation can be achieved through the non-contact overflow structure to ensure the cleanliness of the tap water pipe. At the same time, it can also ensure that the water for washing the body can be replaced with new tap water at any time, preventing the water in the cleaning tank from deteriorating and becoming rotten after the cleaning function has not been used for a long time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a partial structural schematic diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the cleaning water tank in Example 2.

[0019] Figure 4 This is the water circuit schematic diagram of Example 2.

[0020] Figure 5 This is a schematic diagram of the cleaning water tank in Example 3.

[0021] Figure 6 This is the water circuit schematic diagram of Example 3.

[0022] The parts indicated by the numbers in the attached diagram are as follows: 1—flush tank, 2—wash tank, 3—water valve assembly, 4—connecting water pipe, 5—toilet body, 11—water inlet, 12—flush water path, 21—overflow outlet. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Example 1 An air-isolated water tank structure for preventing backflow contamination in smart toilets, such as Figures 1-6 As shown, it includes a flush tank 1 and a cleaning tank 2. The cleaning tank 2 has an overflow port 21 at its upper part, and the flush tank 1 has an inlet 11 at its upper part. The inlet 11 is located below the overflow port 21. The flush tank 1 is connected to a flushing water passage 12 and uses the flushing water passage 12 to clean the toilet. The cleaning tank 2 is connected to a body cleaning component and cleans the body of the toilet user.

[0025] The bottom of the cleaning water tank 2 is higher than the top of the flushing water tank 1. This suspended structure effectively prevents water from flowing back into the cleaning water tank 2 in extreme cases.

[0026] The flush tank 1 has an opening at the top, and the inlet 11 is the opening at the top of the flush tank 1; the projection of the inlet 11 on the horizontal plane covers the projection of the overflow port 21 on the horizontal plane.

[0027] In existing technology, smart toilets have two water supply lines: one connected to the flush tank 1 for rinsing toilet waste, and the other connected to the cleaning tank 2 for cleaning the user's body. However, the manufacturing cost of two water supply lines is high, especially since, to meet European standard EN1717, the flush tank 1's piping requires a costly anti-backflow device to prevent sewage from the toilet from flowing back into the municipal water supply system and affecting its cleanliness. This improved design uses only one water supply line. Tap water first supplies the cleaning tank 2. When the cleaning tank 2 is full, water flows naturally down through the overflow port 21 to the flush tank 1 for toilet flushing due to gravity. This structure not only saves on one water supply component and achieves air isolation through a non-contact overflow structure, ensuring the cleanliness of the tap water pipes, but also ensures that the water used for cleaning the body can be replaced with fresh tap water at any time, preventing the water in the cleaning tank 2 from becoming contaminated and spoiled after prolonged periods without use of the cleaning function.

[0028] It also includes a water valve assembly 3 and a connecting water pipe 4. The municipal tap water pipe is connected to the inlet of the water valve assembly 3, and the outlet of the water valve assembly 3 is connected to the connecting water pipe 4. The connecting water pipe 4 works with the cleaning water tank 2 to transport water to the cleaning water tank 2.

[0029] Example 2 Same as in Example 1, such as Figure 2 , Figure 5 , Figure 6 As shown, the difference lies in the upper opening of the cleaning water tank 2. The overflow port 21 is the upper opening of the cleaning water tank 2, and the outlet of the connecting water pipe 4 is located above the cleaning water tank 2. The end of the water pipe 4 outlet and the horizontal plane where the upper opening of the cleaning water tank 2 is located (i.e., the highest water level line stored in the cleaning water tank 2) are fitted with a gap. This structure is the AA air gap structure in the European standard EN1717. The "AA" air gap is a visible, unobstructed, and complete air gap between the lowest point of the inlet and the surface of the receiving container. This surface determines the maximum operating liquid level when the equipment overflows.

[0030] Example 3 Same as in Example 1, such as Figure 3 , Figure 4 As shown, the difference is that the overflow port 21 is located on the side wall of the upper part of the cleaning water tank 2, and the end of the water outlet of the connecting water pipe 4 is fitted with the horizontal plane where the overflow port 21 is located (i.e. the highest water level line stored in the cleaning water tank 2).

[0031] Overflow port 21 has a non-circular opening; its cross-section is rectangular. This structure conforms to the AB air gap structure in European standard EN1717. The "AB" air gap refers to the permanent distance between the lowest point of the inlet and the critical water level. The overflow port should be designed as a non-circular structure and be able to discharge the maximum inlet flow rate under positive pressure failure conditions.

[0032] Example 4 Similar to Example 1, except that a water level sensor is installed on the upper side wall of the flush tank 1. When the water level in the flush tank 1 reaches the set value, the water level sensor is triggered, and at the same time, the water valve assembly 3 controls the municipal tap water pipe to enter, thereby preventing the water in the flush tank 1 from overflowing.

[0033] Example 5 Similar to Embodiment 1, but with the difference that it also includes a toilet body 5, with the flush tank 1 and the cleaning tank 2 both embedded in the rear of the toilet body 5. Integrating the flush tank 1 and the cleaning tank 2 into the interior of the toilet body 5 eliminates the need for a pre-installed tank in the wall, offering advantages such as reduced costs, easier product maintenance, simpler installation, and space saving.

[0034] In summary, the above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.

Claims

1. An air isolation water tank structure for preventing backflow contamination of a smart toilet, characterized by: It includes a flushing water tank (1) and a cleaning water tank (2). The cleaning water tank (2) has an overflow port (21) at the top and a water inlet (11) at the top. The water inlet (11) is located below the overflow port (21). The flushing water tank (1) is connected to a flushing water passage (12), and the cleaning water tank (2) is connected to a body cleaning component.

2. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 1, characterized in that: The bottom of the cleaning water tank (2) is higher than the top of the flushing water tank (1).

3. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 1, characterized in that: The flush tank (1) has an opening at the top, and the inlet (11) is the opening at the top of the flush tank (1); the projection of the inlet (11) on the horizontal plane covers the projection of the overflow port (21) on the horizontal plane.

4. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 1, characterized in that: It also includes a water valve assembly (3) and a connecting water pipe (4). The municipal water supply pipe is connected to the inlet of the water valve assembly (3), and the outlet of the water valve assembly (3) is connected to the connecting water pipe (4). The connecting water pipe (4) works with the cleaning water tank (2) and transports water to the cleaning water tank (2).

5. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 1, characterized in that: The upper opening of the cleaning water tank (2) is provided, the overflow port (21) is the upper opening of the cleaning water tank (2), the outlet of the connecting water pipe (4) is located above the cleaning water tank (2), and the end of the outlet of the connecting water pipe (4) and the horizontal plane where the upper opening of the cleaning water tank (2) is located are fitted with a clearance.

6. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 1, characterized in that: The overflow port (21) is located on the side wall of the upper part of the cleaning water tank (2), and the end of the water outlet of the connecting water pipe (4) is fitted with the horizontal plane where the overflow port (21) is located.

7. The air isolation water tank structure for preventing backflow pollution of a smart toilet according to claim 6, characterized in that: The cross-section of the overflow port (21) is a non-circular opening.

8. The air-isolated water tank structure for preventing backflow contamination in a smart toilet according to claim 1, characterized in that: A water level sensor is installed on the upper side wall of the flushing tank (1).

9. The air-isolated water tank structure for preventing backflow contamination in a smart toilet according to claim 1, characterized in that: It also includes the toilet body (5), the flush tank (1) and the cleaning tank (2), all of which are embedded in the rear of the toilet body (5).

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