Backflow prevention structure

Abstract

According to the technical scheme, the backflow prevention structure is characterized by comprising an air partition device, the air partition device comprises an injection opening and a receiving opening, the injection opening and the receiving opening are communicated with air, an air flow guide structure is further arranged between the injection opening and the receiving opening, and the air flow guide structure is provided with an air inlet and an air outlet; the air inlet is close to the jet orifice, the air outlet is close to the receiving port, and the air guide structure is used for guiding airflow flowing along the receiving port from the jet orifice out of the air outlet; an air flow guide structure is arranged in the air breaker, diverging sputtering of jet water flow and air resistance in the flowing direction are weakened, meanwhile, dependence on a traditional partition plate and a through hole structure is not needed, the problem of waterway interruption caused by scaling and accumulation of through holes and foreign matter blockage is fundamentally solved, and normal use of functions of the human body cleaning device is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of toilet bidet technology, and more specifically to an anti-backflow structure. Background Technology

[0002] Bidets, a common feature of smart toilets, are used to supply water for washing the body. In existing bidet products, when water is directly supplied from the tap, an anti-backflow mechanism is needed to prevent wastewater from flowing back into the tap water pipes and contaminating the water source in the event of negative pressure in the tap water pipes. This anti-backflow mechanism, employing an air-blocking method, effectively prevents wastewater from flowing back.

[0003] In existing air-blocking devices, the water jet is affected by air turbulence, leading to dispersion and a reduction in the water flow into the receiving port. In current technology, a baffle with a through-hole is installed between the jet nozzle and the receiving port to improve water dispersion. However, over time, the through-hole may accumulate scale due to residual water or allow foreign objects to enter, causing water flow obstruction, blockage, or even rendering the cleaning device unusable.

[0004] Currently, there are no effective solutions in existing technologies to address the issues of water jet dispersion and the tendency for scale and blockage in the through holes of the baffles in air isolation devices. Summary of the Invention

[0005] The purpose of this invention is to simultaneously solve the two major technical challenges of water flow dispersion and channel blockage through an innovative airflow guiding design. To achieve the above objective, this invention provides the following technical solution:

[0006] An anti-backflow structure includes an air isolation device. The air isolation device includes a spray nozzle and a receiving port. The spray nozzle is connected to a water inlet pipe and is used to spray water. The receiving port is connected to a water outlet device and is used to receive the water sprayed from the spray nozzle. The spray nozzle and the receiving port are in communication with air. An air guide structure is also provided between the spray nozzle and the receiving port. The air guide structure has an air inlet and an air outlet. The air inlet is located near the spray nozzle, and the air outlet is located near the receiving port. The air guide structure is used to guide the airflow flowing from the spray nozzle along the receiving port from the air outlet.

[0007] The invention is further configured such that: the air isolation device includes a web plate, the web plate has a cavity, the spray port and the receiving port are respectively located at the front and rear ends of the cavity, water flows through the cavity, the cavity forms side plates on the left and right sides along the water flow path, and an air inlet and an air outlet are opened on the side plates located on one or both sides of the water flow.

[0008] The present invention is further configured such that: the air guiding structure further includes an air guide plate disposed between the side plate and the water flow, and an air guiding channel is formed between the air guide plate and the side plate, and the air guiding channel is used to guide the airflow along a preset path from the air inlet to the air outlet.

[0009] The present invention is further configured such that: the air guide plate includes a first air guide plate disposed between the air inlet and the water flow, and a second air guide plate disposed between the air outlet and the water flow, wherein the first air guide plate and the second air guide plate are spaced apart to form a notch, and the air around the injection port and / or receiving port can communicate with the air guiding channel through the notch.

[0010] The invention is further configured such that: the air isolation device includes two or more sets of spray nozzles and receiving nozzles, with water flow formed between the spray nozzles and the corresponding receiving nozzles; the air guide plate includes two sets, with the two sets of air guide plates respectively disposed on both sides of each set of water flow; it also includes an intermediate guide plate between each adjacent set of air guide plates, used to guide the airflow flowing out of the gap between the first air guide plate and the second air guide plate that are spaced apart in each set; airflow channels are provided on both sides of the intermediate guide plate for airflow to pass through, and the airflow can flow out along the gap, be guided by the intermediate guide plate, and then flow from the airflow channel on one side of the intermediate guide plate to the other side.

[0011] The present invention is further configured such that: the web includes a top plate, and the top plate has an opening that connects the outside atmosphere with the cavity.

[0012] The present invention is further configured to include a splash guard, which is disposed above the top plate and is not sealed to the top plate.

[0013] The invention is further configured to include a water receiving container, which is located below the air isolation device, and the bottom of the belly plate is open, allowing splash water and backflow water to drain into the water receiving container.

[0014] The present invention is further configured such that: the water outlet device includes a spray bar and a spray bar housing, the spray bar is telescopically movable and located inside the spray bar housing, the side of the spray bar near the receiving port is provided with an end cap protruding towards the receiving port, the end cap includes a cap top that abuts against the water flow received from the receiving port, and water inlet holes are provided around the end cap.

[0015] The present invention is further configured such that: one end of the air isolation device is provided with a water inlet connector, the air isolation device is connected to the water inlet pipe through the water inlet connector, a rectifier core is provided between the water inlet connector and the spray nozzle, the rectifier core is used to rectify the water source from the water inlet pipe and deliver it to the spray nozzle, and the water outlet device is connected to the receiving port, and the water flow sprayed from the spray nozzle enters the water outlet device through the receiving port.

[0016] Compared with the prior art, the present invention has at least the following advantages: 1. The air isolation device separates the inlet pipe from the outlet device (bidet) to prevent sewage backflow. The air isolation device is equipped with an air guiding structure, which directs the airflow from the jet nozzle to the receiver through the air outlet. This effectively reduces the rebound and backflow of air after it reaches the vicinity of the receiver, weakens the dispersion and splashing of the jet water, and reduces air resistance in the flow direction. At the same time, it does not rely on traditional baffles and through-hole structures, thus avoiding the problem of water flow interruption caused by scale buildup and foreign object blockage in through-holes, ensuring the normal use of the outlet device.

[0017] 2. An air guide plate is installed between the side plate and the water flow. The air guide plate and the side plate form an air guiding channel, which allows the airflow from the injection port to the receiving port to flow from the air inlet to the air outlet along a preset path.

[0018] 3. The opening in the top plate prevents the formation of a sealed space inside the belly plate, allowing air to enter from the top, further ensuring the formation of an air barrier in the anti-backflow structure; at the same time, the splash cap at the top effectively prevents water from splashing into the toilet structure, avoiding water stains and the growth of bacteria.

[0019] 4. Splashed water and backflow water inside the chamber can quickly flow into the water receiving container below, preventing water from overflowing everywhere. The water receiving container is directly connected to the toilet, realizing the directional discharge of wastewater without affecting the backflow prevention performance of the air barrier.

[0020] 5. The jet of water forms a slight parabola due to gravity. Designing the receiving port as a vertical strip shape increases the water receiving area and range, effectively capturing the water flow and achieving a more splash-proof and larger water intake effect.

[0021] 6. A rectifier core is installed to rectify and streamline the water source from the inlet pipe, and to increase the spray intensity and concentration of the water jet.

[0022] 7. The water outlet device includes a spray bar and a spray bar housing. The spray bar is telescopically movable and is located inside the spray bar housing. The spray bar has an end cap protruding towards the receiving port on the side close to the receiving port. The end cap includes a cap top that abuts against the water flow received from the receiving port. When the water flow received from the receiving port flows into the spray bar housing, the water flow first sprays onto the cap top and abuts against the cap top, thereby pushing the spray bar and preventing the spray bar from extending without jamming. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the first embodiment; Figure 2 This is a diagram of the internal structure of the web plate in the first embodiment (splash protector omitted); Figure 3 This is a diagram illustrating the installation of the splash guard; Figure 4 This is a perspective sectional view of the first embodiment; Figure 5 This is an exploded view of the first embodiment; Figure 6 This is a schematic diagram of the first embodiment without the splash cap installed; Figure 7 This is a schematic diagram of an air isolation device; Figure 8 This is a top view of the first embodiment when it is installed on the toilet mounting plate; Figure 9 This is a bottom view of the first embodiment when it is installed on the toilet mounting plate; Figure 10 This is a right view of the air isolation device of the first embodiment.

[0024] Figure 11 This is a right view of the air isolation device (air guide plate omitted) of the first embodiment.

[0025] Figure 12 This is a cross-sectional view of the second embodiment; Figure 13 This is a diagram of the internal structure of the web plate in the fourth embodiment.

[0026] Figure 14 This is a schematic diagram of the spray bar structure.

[0027] Explanation of reference numerals in the attached figures: 1. Air isolation device; 2. Splash cap; 3. Water receiving container; 4. Spray nozzle; 5. Receiver port; 6. Web plate; 601. Top plate; 602. Side plate; 603. First air guide plate; 604. Second air guide plate; 7. Cavity; 8. Opening; 9. Drainage channel; 10. Water inlet connector; 11. Rectifier core; 12. Spray bar; 13. Toilet mounting plate; 14. Drain outlet; 15. Spray head; 16. Air inlet; 17. Air outlet; 18. Spray bar housing; 19. Water storage chamber; 20. Reset piece; 21. End cap; 211. Cap top; 212. Water inlet through hole. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] First embodiment: like Figures 1 to 9As shown, an anti-backflow structure includes an air isolation device 1. This structure is mainly used to connect the water inlet pipe of the toilet to the bidet (or human body washing device, referred to as the water outlet device in this article). While providing the necessary water supply, it prevents sewage backflow and water source pollution when negative pressure occurs in the tap water pipe.

[0030] The air isolation device 1 includes a spray nozzle 4 and a receiving port 5. The spray nozzle 4 is connected to the water inlet pipe and is used to spray water. The receiving port 5 is connected to the water outlet device and is used to receive the water sprayed from the spray nozzle 4. The spray nozzle 4 and the receiving port 5 are connected to the air. An air guide structure is also provided between the spray nozzle 4 and the receiving port 5. The air guide structure has an air inlet 16 and an air outlet 17. The air inlet 16 is located near the spray nozzle 4, and the air outlet 17 is located near the receiving port 5. The air guide structure is used to guide the airflow (i.e., the airflow from the spray nozzle 4 to the receiving port 5) from the air outlet 17.

[0031] The main body of the air isolation device 1 is a web plate 6, which is hollow inside. The cavity 7 is formed by a top plate 601, front and rear end walls, and two side plates 602. This cavity 7 is horizontal (i.e., the direction of water flow), with a jet nozzle 4 at its front end and a receiving port 5 at its rear end. The jet nozzle 4 is connected to an external water inlet pipe via a water inlet connector 10, while the receiving port 5 is connected to the bidet's spray bar 12 for performing the washing function. To ensure the effectiveness of the air isolation, there is no physical pipe connection between the jet nozzle 4 and the receiving port 5. After the water flows out of the jet nozzle 4, it passes through a gap exposed to the air before reaching the receiving port 5 on the opposite side. This gap is located inside the cavity 7 and is open to the outside atmosphere, ensuring it remains an open space and thus forming a reliable backflow prevention barrier.

[0032] A unique airflow guiding structure is provided within the cavity 7. This structure is designed to actively manage the airflow induced by the high-speed jet of water, solving the core problem of water flow dispersion caused by air turbulence in traditional designs.

[0033] The cavity has side plates formed on its left and right sides along the water flow path. The air guiding structure includes an air inlet and an air outlet on the side plates located on one or both sides of the water flow. Specifically, in this embodiment, an air inlet 16 and an air outlet 17 are formed on the side plates 602 on both sides of the cavity 7. The air inlet 16 is located at the end of the side plate 602 near the jet port 4, and the air outlet 17 is located at the end of the side plate 602 near the receiving port 5. Furthermore, an air guide plate is provided on the inner side of the side plate 602, that is, between the side plate 602 and the water flow. The air guide plate and the side plate 602 are kept at a certain distance, thereby forming an air guiding channel between them. The air guiding channel is used to guide the airflow along a preset path from the air inlet to the air outlet. The air guide plate includes a first air guide plate 603 disposed between the air inlet 16 and the water flow, and a second air guide plate 604 disposed between the air outlet 17 and the water flow. The first air guide plate 603 and the second air guide plate 604 are spaced apart to form a notch, allowing air around the injection port and / or receiving port to communicate with the air guide channel through the notch. In this embodiment, the first air guide plate and the second air guide plate are respectively sealed and fixedly connected to the front and rear end walls and the top plate of the cavity.

[0034] In this embodiment, as Figure 10 and Figure 11 As shown, the air inlet 16, air outlet 17, jet nozzle 4, and receiver 5 are positioned at the same horizontal level; this allows the airflow at jet nozzle 4 and receiver 5 to flow out more effectively, reducing local eddies or flow losses that may be caused by height differences, thereby more effectively reducing the generation of air turbulence in the central area of ​​cavity 7 and achieving the core objective of stabilizing the water column.

[0035] In this embodiment, the air isolation device includes two sets of spray nozzles and receiving ports, forming a water flow between the spray nozzles and corresponding receiving ports. The air guide plates for the spray bar 12 include two sets, each set positioned on either side of the water flow from the spray bar 12. It also includes an intermediate guide plate between adjacent sets of air guide plates, used to guide the airflow exiting through the gap between the first and second air guide plates in each set. Airflow channels are provided on both sides of the intermediate guide plate, allowing the airflow to exit through the gap, be guided by the intermediate guide plate, and then flow from one side of the intermediate guide plate to the other side. In other embodiments, two or more sets of spray nozzles and receiving ports can be provided. In this embodiment, the two sets of spray nozzles and receiving ports are used to prevent backflow of the corresponding posterior wash spray bar and feminine wash spray bar on the water outlet device, with each spraying separately. In other embodiments, only one set of spray nozzles and receiving ports may be included, used only for one spray bar.

[0036] The working principle is as follows: When water flows from the jet nozzle 4 towards the receiver 5, it causes the surrounding air to move, forming an airflow from the jet nozzle 4 towards the receiver 5. In a traditional structure without a guide, this airflow circulates and collides disorderly within the semi-enclosed cavity 7, generating turbulence and interfering with the stability of the water column. In this invention, during the airflow process, part of the airflow is drawn in orderly from the notch, flows through the air guide channel, and is finally discharged from the air outlet 17, while the remaining air flows upward and downward at the end of the channel. This process actively removes some of the air accompanying the jet, significantly reducing the air backflow and vortex intensity in the central region of the cavity 7, thereby reducing the resistance in the direction of water column flow.

[0037] The web 6 includes a top plate 601 horizontally positioned at the top. The top plate 601 is designed with openwork and has several openings 8 that connect the outside atmosphere to the cavity. The openings 8 prevent the formation of a sealed space inside the web, allowing air to enter from the top, further effectively ensuring the formation of an air barrier to prevent backflow.

[0038] To maintain a clean appearance and prevent splashing of any small amount of water that may overflow from opening 8, a splash-proof cap 2 is provided on the air isolation device 1. In this embodiment, the splash-proof cap is positioned above the top plate, and the splash-proof cap and the top plate are not sealed. The splash-proof cap 2 can be fixedly connected by heat fusion, welding, or other methods, or can be detached by clips, screws, or other methods. The splash-proof cap 2 is positioned above the belly plate 6, covering the top plate 601 and having a gap between it and the top plate 601, forming an air gap. This ensures that the ventilation function of opening 8 is not obstructed, while effectively blocking any upward splashing water droplets, preventing them from contaminating the internal electrical components of the bidet or the external environment. Furthermore, splashing water droplets can be discharged along the splash-proof cap and fall into the water collection container.

[0039] The anti-backflow structure also includes a water receiving container 3, which is located below the air isolation device 1 and is connected to the toilet. The bottom of the belly plate 6 is open, so any splashing or backflowing water dripping or flowing down from the cavity 7 will fall directly into the water receiving container 3 below due to gravity and then be discharged into the toilet through the water receiving container 3.

[0040] The water collection container 3 is fixedly installed on the toilet mounting plate. The water collection container 3 is equipped with a drain channel 9, the end of which forms a downward-facing drain outlet 14. All collected wastewater is discharged directly into the toilet through this drain outlet 14; alternatively, a downward-facing drain outlet 14 is pre-installed on the toilet mounting plate 13, and the drain channel 9 connects to this drain outlet 14 before being directed into the toilet. This achieves directional and concealed discharge of wastewater, preventing water from accumulating on the bidet casing or toilet surface, and maintaining a dry and hygienic environment.

[0041] In this embodiment, the receiving port 5 is specially designed as a vertically extending strip shape (its overall cross-section or opening 8 outline is a vertical elongated oval or rectangle). This shape design fully considers the natural parabolic trajectory formed by water flow under gravity. The vertical extension expands the effective receiving range on the vertical plane. Even if the water flow is slightly divergent or has slight oscillations in the vertical plane, the strip-shaped receiving port 5 can ensure that it is effectively captured, reducing the requirements for assembly and spraying accuracy and improving the fault tolerance and reliability of the system.

[0042] In this embodiment, the air isolation device 1 is provided with a water inlet connector 10 at one end, and the air isolation device 1 is connected to the water inlet pipe through the water inlet connector 10. A rectifier core 11 is provided between the water inlet connector 10 and the spray nozzle 4. The rectifier core 11 rectifies the water flow from the water inlet pipe, which may be turbulent, so that it becomes smooth and uniform before entering the spray nozzle 4. The water outlet device is connected to the receiving port 5. The water flow sprayed from the spray nozzle 4 enters the water outlet device through the receiving port 5. The water outlet device includes a telescopic spray bar 12 for human body washing.

[0043] The water outlet device includes a spray bar 12, a spray bar housing 18, a water storage chamber 19, and a resetting component 20. The spray bar 12 is telescopically movable inside the spray bar housing 18, which is hollow to form the water storage chamber 19. Pressure accumulation is achieved through continuous water injection. One end of the spray bar housing 18 is fixed to the web plate by a sealed connection, while the other end is an open structure, providing a channel for the telescopic movement of the spray bar 12. The resetting component 20 is disposed inside the water storage chamber 19 and sleeved on the outside of the spray bar 12. One end of the resetting component abuts against the inner wall limiting structure of the spray bar housing 18, and the other end abuts against the pressure-bearing structure of the spray bar 12. Initially, it is in a naturally extended state, and the elastic force pushes the spray bar 12 back to the initial state.

[0044] As water continues to flow into the water storage chamber 19, the pressure inside the chamber gradually increases and pushes the spray bar 12 to extend outward against the elastic force until it reaches its maximum extension stroke, and water is sprayed out from the end of the spray bar 12. When the water supply stops, the water pressure in the water storage chamber 19 gradually decreases, and the reset component 20 uses a spring. Under the action of the elastic restoring force, it drives the spray bar 12 to gradually retract to the initial position, completing the automatic reset.

[0045] The spray bar 12 is provided with an end cap 21 protruding towards the receiving port on the side close to the receiving port. The end cap 21 includes a cap top 211 that abuts against the water flow received from the receiving port. Water inlet holes 212 are provided around the end cap 21. The cap top 211 is a sealed, inwardly concave structure. The water inlet holes 212 are provided around it to allow water flow to enter the interior of the spray bar 12 and spray out from the end of the spray bar 12. When the water flow received from the receiving port flows into the spray bar housing 18, the water flow first sprays onto the cap top 211 and abuts against the cap top 211. That is, the water flow abuts against the cap top 211 and has a pressing tendency, thereby pushing the spray bar 12 so that the spray bar 12 extends quickly and smoothly.

[0046] The working process and beneficial effects of this embodiment are as follows: After being regulated by the inlet pipe, inlet connector 10, and rectifier core 11, tap water is ejected from the spray nozzle 4 in a stable jet. As the water column passes through the air gap within the cavity 7, most of the induced airflow is orderly guided out by the air guiding structure, greatly suppressing air turbulence. The concentrated water flow is efficiently received by the receiving port 5 and sent to the spray bar 12 for cleaning.

[0047] Through an innovative airflow design, the invention simultaneously solves two major technical challenges: water flow dispersion and channel blockage. Specifically, the structure incorporates a flow-guiding system within the air-isolated cavity 7, consisting of a specially arranged air inlet 16, air-guiding channels, and air outlet 17. This system actively guides and orderly discharges the induced airflow generated by the high-speed jet, significantly suppressing air turbulence and maintaining a focused water flow, thereby greatly improving the water transmission efficiency from the jet nozzle 4 to the receiving port 5. This design completely eliminates the traditional easily clogged baffle through-hole structure, fundamentally preventing the risk of water path interruption due to scale or foreign object accumulation, ensuring the long-term reliable operation of the bidet's water supply. Furthermore, the combination of the opening 8 in the top plate 601 and the splash cap 2 provides dual anti-siphon and anti-splash protection, the bottom water receiving container 3 enables directional and clean discharge of wastewater, and the vertical strip-shaped receiving port 5 enhances the water flow reception tolerance. These features work synergistically, enabling the invention to ensure efficient backflow prevention and safety while also possessing excellent channel unobstructed flow, operational stability, and ease of maintenance.

[0048] Second embodiment: like Figure 12 As shown, an anti-backflow structure differs from the first embodiment in that, in the first embodiment, the spray nozzle 4 is integrally formed in the air isolation device 1, while in this embodiment, it is installed in the air isolation device 1 by an independent nozzle 15, and the spray nozzle 4 is formed on the nozzle 15.

[0049] The remaining undescribed parts are the same as in the first embodiment and will not be repeated here.

[0050] Third embodiment: An anti-backflow structure (not shown) differs from the first embodiment in that it does not have an air guide plate on the inner side of the side plate. Instead, it has an air inlet and an air outlet at the positions corresponding to the spray nozzle and the receiving port on the side plate. Air is drawn in through the air inlet 16 and discharged through the air outlet 17. When the water column flows, the air guide structure directly guides the air carried by the water column out through the air outlet 17.

[0051] The remaining undescribed parts are the same as in the first embodiment and will not be repeated here.

[0052] Fourth embodiment: like Figure 13 The difference between the anti-backflow structure described above and the first embodiment is that the air guide plate in this embodiment is not divided into two parts, but is connected as a whole first air guide plate 603, and air can also flow in the vertical direction.

[0053] The remaining undescribed parts are the same as in the first embodiment and will not be repeated here.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present invention should be included within the protection scope of the present invention.

[0055] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A backflow prevention structure, characterized in that: The device includes an air isolation device comprising a spray nozzle and a receiving port. The spray nozzle is connected to a water inlet pipe and is used to spray water. The receiving port is connected to a water outlet device and is used to receive the water sprayed from the spray nozzle. The spray nozzle and the receiving port are in communication with air. An air guide structure is also provided between the spray nozzle and the receiving port. The air guide structure has an air inlet and an air outlet. The air inlet is located near the spray nozzle, and the air outlet is located near the receiving port. The air guide structure is used to guide the airflow flowing from the spray nozzle along the receiving port from the air outlet.

2. The anti-backflow structure according to claim 1, characterized in that: The air isolation device includes a web plate with a cavity. The spray port and the receiving port are located at the front and rear ends of the cavity, respectively. Water flows through the cavity. Side plates are formed on the left and right sides of the cavity along the water flow path. An air inlet and an air outlet are provided on the side plates located on one or both sides of the water flow.

3. The anti-backflow structure according to claim 2, characterized in that: The air guiding structure also includes an air guide plate disposed between the side plate and the water flow, and an air guiding channel is formed between the air guide plate and the side plate. The air guiding channel is used to guide the airflow along a preset path from the air inlet to the air outlet.

4. The anti-backflow structure according to claim 3, characterized in that: The air guide plate includes a first air guide plate disposed between the air inlet and the water flow, and a second air guide plate disposed between the air outlet and the water flow. The first air guide plate and the second air guide plate are spaced apart to form a gap, and the air around the injection port and / or receiving port can communicate with the air guide channel through the gap.

5. The anti-backflow structure according to claim 4, characterized in that: The air isolation device includes two or more sets of spray nozzles and receiving nozzles, with water flow formed between the spray nozzles and the corresponding receiving nozzles. The air guide plate includes two sets, which are respectively arranged on both sides of the water flow in each set. It also includes an intermediate guide plate between each set of adjacent air guide plates, which is used to guide the airflow flowing out of the gap between the first air guide plate and the second air guide plate in each set. Airflow channels are provided on both sides of the intermediate guide plate for airflow to pass through. The airflow can flow out along the gap, be guided by the intermediate guide plate, and then flow from the airflow channel on one side of the intermediate guide plate to the other side.

6. The anti-backflow structure according to claim 2, characterized in that: The web includes a top plate, which has an opening that connects the outside atmosphere to the cavity.

7. The anti-backflow structure according to claim 6, characterized in that: It also includes a splash guard, which is disposed above the top plate and is not sealed to the top plate.

8. The anti-backflow structure according to claim 2, characterized in that: It also includes a water receiving container, which is located below the air isolation device. The bottom of the belly plate is open, and splash water and backflow water are discharged into the water receiving container.

9. The anti-backflow structure according to claim 1, characterized in that: The water outlet device includes a spray bar and a spray bar housing. The spray bar is telescopically movable and is located inside the spray bar housing. An end cap protruding towards the receiving port is provided on the side of the spray bar that is close to the receiving port. The end cap includes a cap top that abuts against the water flow received from the receiving port. Water inlet holes are provided around the end cap.

10. The anti-backflow structure according to claim 1, characterized in that: The air isolation device is provided with a water inlet connector at one end. The air isolation device is connected to the water inlet pipe through the water inlet connector. A rectifier core is provided between the water inlet connector and the spray nozzle. The rectifier core is used to rectify the water source from the water inlet pipe and deliver it to the spray nozzle. The water outlet device is connected to the receiving port. The water flow sprayed from the spray nozzle enters the water outlet device through the receiving port.

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