Anti-backflow bottle cap
By designing an anti-backflow valve assembly for the anti-backflow bottle cap, and using the breaking of a ball bearing that falls into the bottle to detect counterfeiting, the problem of existing technologies being unable to completely prevent backflow is solved, achieving a balance between anti-counterfeiting and normal use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WULIANGYE
- Filing Date
- 2026-04-08
- Publication Date
- 2026-05-12
AI Technical Summary
Existing anti-backflow bottle caps cannot completely prevent backflow counterfeiting, making it difficult for consumers to determine whether a product has been counterfeited based on the bottle packaging.
An anti-backflow bottle cap was designed, comprising a bottle mouth connector, an inner cap, a lower tube, an outer cap, and an anti-backflow valve assembly. Utilizing two ball bearings and a partition, when the cap breaks under external force, the second ball bearing falls into the bottle, allowing consumers to directly observe and determine if it is counterfeit. At the same time, the first ball bearing seals the wine outlet channel by gravity, ensuring sealing and flow.
It effectively prevents counterfeiting and allows consumers to directly judge the authenticity of products, enhancing their sense of security. Market supervision can easily investigate and punish counterfeiting without affecting normal use.
Smart Images
Figure CN122009665A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of liquid container technology, and in particular to an anti-backflow bottle cap. Background Technology
[0002] Currently, a method of counterfeiting liquor by pouring liquid back into the bottle has emerged in the liquor industry. This involves using a mineral water bottle connected to a liquor bottle via a backflow connector, and then transferring the liquor inside by squeezing. This method has severely damaged the market order of the liquor industry. Bottle cap anti-counterfeiting technology is an important means of preventing counterfeiting of bottled products. To combat backflow counterfeiting, liquor manufacturers generally adopt the method of adding anti-backflow structures to bottle caps to achieve the anti-counterfeiting function of their products.
[0003] For example, Chinese invention patent application CN108861042A discloses an anti-backflow and anti-counterfeiting bottle cap. Its technical solution includes a top cap, a middle cap, and an inner cap. The top cap and the middle cap are threaded together. The middle cap has an annular buffer device inside. The buffer device is connected to the inside of the middle cap through a connecting piece. An inner plug is also connected to the buffer device. The outer diameter of the inner plug is larger than the outer diameter of the buffer device but smaller than the inner diameter of the middle cap. The middle cap and the inner cap are threaded together. The bottom outer circumference of the middle cap and the threaded end of the inner cap are both provided with bosses. The lower end of the inner cap is conical and has a liquid outflow channel. A glass bead is provided inside the inner cap. The size of the glass bead is larger than the bottom opening of the inner cap. Both the middle cap and the inner cap are hollow structures. A metal ring is provided at the boss of the middle cap. The connection end of the metal ring and the middle cap is tapered inward.
[0004] For example, Chinese invention patent application CN115231124A discloses a backflow-proof sealing bottle cap. Its technical solution includes an upper cap, a lower cap, an inner cap, and a bead. The upper and lower caps are connected by a point-like connection. The inner cap is an integrally molded structure. The upper part of the inner cap is connected to the upper cap, the middle part is connected to the lower cap, and the lower part is connected to the bottle mouth. The inner cap is hollow and has an internal cavity. The cavity is connected to the inner wall of the inner cap by a partition. The cavity is closed at the top and hollow on the side. The bead is placed inside the cavity. There is a limiting block at the bottom of the cavity. The limiting block is conical and the diameter of the conical surface is smaller than the diameter of the bead, which can support the bead and prevent it from falling out.
[0005] The technical solutions in the above-mentioned invention applications all use a ball bearing structure to block the liquid outlet channel, thereby limiting the outflow speed of the liquid. Therefore, for existing methods of counterfeiting by backfilling, they can only slow down the speed at which the liquor is transferred out of the bottle during counterfeiting, but cannot achieve a complete anti-counterfeiting effect. Consumers cannot directly determine from the bottle packaging whether the product has been counterfeited. Summary of the Invention
[0006] The technical problem to be solved by the present invention is to provide an anti-backflow bottle cap that effectively improves the anti-counterfeiting effect against backflow counterfeiting.
[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an anti-backflow bottle cap, including a bottle mouth connector, an inner cap, a lower tube, and an outer cap installed on the bottle mouth. The bottle mouth connector is a through structure, detachably connected and communicating with the bottle mouth. The inner cap is detachably connected to the bottle mouth connector and seals the bottle mouth connector. The lower tube is sleeved outside the bottle mouth connector, and the outer cap is sleeved outside the inner cap and abuts against the lower tube. It also includes an anti-backflow valve assembly, which includes an inner plug, a partition, a bottle mouth inner component, and a first roller. The inner stopper has a bottom that extends into the bottle neck and has an expandable anti-backflow port at its bottom. The bottle neck inner part is located on top of the bottle neck connector. The partition separates the inner stopper and the bottle neck inner part to form two cavities, which are connected by a lower outlet at the bottom of the partition. The first ball is movably located in the upper cavity, and the second ball is movably located in the lower cavity. When the second ball is subjected to downward pressure, it opens the anti-backflow port and disengages downward from the lower cavity.
[0008] As an improvement to the above solution: the inner cover is provided with an inner cover sealing ring, which is inserted into the top opening of the bottle mouth connector. The inner cover sealing ring abuts against the inner wall of the top opening of the bottle mouth connector to form a sealing fit; the inner cover is threadedly connected to the bottle mouth connector and snapped together with the outer cover.
[0009] As an improvement to the above solution: the middle part of the bottle neck inner component is provided with a frustum structure, and multiple upper wine outlets are evenly distributed around the outer periphery of the frustum structure in a circumferential manner; the outer diameter of the frustum structure gradually increases from top to bottom, and the inner cap sealing ring is inserted between the bottle neck connector and the frustum structure, and the inner cap sealing ring simultaneously forms a sealing fit with the outer peripheral surface of the frustum structure and the inner wall surface of the bottle neck connector.
[0010] As an improvement to the above solution: the upper wine outlet channel of the bottle neck internal component is a curved channel that passes through and bends from below the frustum structure, with the two openings of the upper wine outlet channel located on the outer and inner sides of the frustum structure, respectively.
[0011] As an improvement to the above solution: the top of the inner plug is provided with an inner plug sealing ring, the middle of the inner plug is provided with a limiting ring extending radially outward, the bottom of the partition is provided with a partition sealing ring, and the outer diameter of the partition sealing ring gradually increases from bottom to top; the inner plug forms an axial limiting fit with the bottle mouth connector inside the bottle mouth connector through the limiting ring, the inner plug sealing ring is inserted between the partition sealing ring and the inner wall of the bottle mouth connector, and the inner plug sealing ring simultaneously forms a sealing fit with the outer circumferential surface of the partition sealing ring and the inner wall of the bottle mouth connector.
[0012] As an improvement to the above solution: a lower limiting ring is provided on the inner wall of the lower tube, the top of the lower tube is bent inward to form an upper limiting ring, the lower limiting ring of the lower tube forms an axial limiting fit with the bottom of the bottle mouth connector from below, and the upper limiting ring of the lower tube forms an axial limiting fit with the bottom of the inner cap from above.
[0013] As an improvement to the above solution: the anti-backflow port is an inverted conical structure composed of multiple inclined baffles arranged in a ring with intervals, and adjacent baffles are connected by a breakable piece; the diameter of the anti-backflow port when it is not unfolded is smaller than the outer diameter of the second ball.
[0014] As an improvement to the above scheme: the second ball is a colored ball.
[0015] The beneficial effects of this invention are as follows: By equipping the bottle cap with an anti-backflow valve assembly, the two ball bearings and the partition in the anti-backflow valve assembly serve as anti-counterfeiting measures. When the anti-backflow valve assembly is subjected to excessive external air pressure or the ball bearings are pushed by an external structure, the lower outlet of the partition will break due to the external force. Once broken, it cannot be restored, thus structurally preventing counterfeiters from counterfeiting through backflow. At the same time, after the lower outlet breaks, the second ball bearing of the anti-backflow valve assembly will fall into the bottle because it is no longer obstructed by the lower outlet. Consumers can directly observe whether the bottle has been opened or counterfeited by observing whether the ball bearing is present, thus effectively reducing the difficulty for consumers to identify counterfeit products and improving their sense of security. It also facilitates market supervision departments to quickly investigate counterfeit products. In addition, the first ball bearing in the anti-backflow valve assembly can seal the outlet channel of the anti-backflow valve assembly by its own weight, thus ensuring the normal sealing and outflow of the wine in the bottle. Attached Figure Description
[0016] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is an exploded view of the structure of the present invention; Figure 3 This is an exploded cross-sectional view of the structure of the present invention; Figure 4 This is a schematic diagram showing the partition from before the backflow prevention port cracked to after the backflow prevention port cracked.
[0017] Figure 5 This is a schematic diagram of the wine dispensing path during the wine dispensing process of this invention.
[0018] The markings in the diagram are as follows: 100-bottle neck, 200-bottle neck connector, 300-inner cap, 310-inner cap sealing ring, 400-lower tube, 500-outer cap, 610-inner plug, 611-anti-backflow port, 612-inner plug sealing ring, 613-limiting ring, 620-partition, 621-lower outlet, 622-partition sealing ring, 630-bottle neck internals, 631-upper outlet channel, 640-first ball bearing, 650-second ball bearing. Detailed Implementation
[0019] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.
[0020] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0021] The anti-backflow bottle cap disclosed in this invention is installed on the bottle opening 100 of bottled products, especially for products in the wine industry, to prevent backflow and counterfeiting. Figures 1 to 3 As shown, the anti-backflow bottle cap disclosed in this invention includes a bottle mouth connector 200, an inner cap 300, a lower tube 400, an outer cap 500, and an anti-backflow valve assembly. The bottle mouth connector 200 is directly mounted and fixed to the bottle mouth 100, and the bottle mouth connector 200 and the bottle mouth 100 are detachably connected by a snap-fit connection. The bottle mouth connector 200 is a through structure with an axial through hole, allowing the bottle mouth connector 200 to communicate with the interior of the bottle body through the bottle mouth 100. The inner cap 300 is mounted on the bottle mouth connector 200, sealing the top opening of the bottle mouth connector 200. The inner cap 300 and the bottle mouth connector 200 are detachably connected by a threaded connection or a snap-fit connection, preferably a threaded connection. The lower tube 400 is fitted over the bottle neck connector 200, and the outer cover 500 is fitted over the inner cover 300. The bottom of the outer cover 500 abuts against the top of the lower tube 400. The outer cover 500 and the lower tube 400 together form the outer shell structure of the entire anti-backflow bottle cap, which protects the internal bottle neck connector 200, inner cover 300 and anti-backflow valve assembly. The outer cover 500 and the lower tube 400 adopt a layered assembly structure to form a stable overall protective structure, which is convenient for production assembly and can fit tightly after assembly, reducing assembly gaps.
[0022] Specifically, such as Figures 1 to 3As shown, the anti-backflow valve assembly added in this invention includes an inner plug 610, a partition 620, a bottle mouth inner part 630, a first ball bearing 640, and a second ball bearing 650; the anti-backflow valve assembly is installed in the through hole of the bottle mouth connector 200. The inner plug 610 is a through structure with an axial through hole. The bottom of the inner plug 610 is inserted into the opening of the bottle mouth 100. An anti-backflow port 611 is provided at the bottom of the inner plug 610. The anti-backflow port 611 is an opening structure that can be expanded outward. The bottle mouth inner part 630 is provided at the top of the bottle mouth connector 200. The partition 620 is provided between the inner plug 610 and the bottle mouth inner part 630. The space between the inner plug 610 and the bottle mouth inner part 630 is separated by the partition 620 to form two cavities, upper and lower. The bottom of the partition 620 is provided with a lower wine outlet 621. The upper cavity and the lower cavity formed by the partition 620 are connected through the lower wine outlet 621 to realize the flow of liquid. The first ball bearing 640 is disposed in the upper cavity separated by the partition 620, and the second ball bearing 650 is disposed in the lower cavity separated by the partition 620. Both the first ball bearing 640 and the second ball bearing 650 can roll within their respective cavities. When the bottle is normally placed vertically, the first ball bearing 640 blocks and seals the lower outlet 621 under its own weight, and the second ball bearing 650 blocks and seals the anti-backflow outlet 611 under its own weight. However, if excessive external air pressure is applied to the anti-backflow valve assembly or When a thin rod extends from the outside and pushes the second ball bearing 650, the second ball bearing 650 will be compressed and open the anti-backflow port 611, causing the anti-backflow port 611 to break and unfold. The second ball bearing 650, no longer obstructed by the anti-backflow port 611, will detach from the lower cavity and fall into the bottle. At this point, the second ball bearing 650 can be clearly observed from the outside of the bottle, thus serving an anti-counterfeiting function. To make it easier for consumers to observe the second ball bearing 650, it can be made into a colored ball bearing. Both the first ball bearing 640 and the second ball bearing 650 are made of glass. If counterfeiters transfer the wine inside the bottle by backflow, the first ball bearing 640 and the second ball bearing 650 will collide and tear, producing glass fragments, effectively preventing counterfeiting. Furthermore, during normal use, after opening the bottle cap, when tilting the bottle to pour wine, if... Figure 5 As shown, the first ball bearing 640 and the second ball bearing 650 roll downwards under their own weight, thus detaching from their original positions and preventing blockage of the lower outlet 621 and the anti-backflow outlet 611. At this point, the liquid can flow out normally, and the flow rate can be controlled by the ball bearings, similar to existing products. Therefore, this invention, by setting an anti-backflow valve assembly, not only prevents backflow and counterfeiting but also ensures the normal flow of liquid from the bottle, without affecting normal use after opening.
[0023] like Figure 1 and Figure 4As shown, the anti-backflow port 611 is an inverted conical structure composed of multiple inclined baffles arranged in a ring at intervals, with adjacent baffles connected by fracturing plates. The diameter of the anti-backflow port 611 when not expanded is smaller than the outer diameter of the second ball bearing 650. By setting the anti-backflow port 611 with an inverted conical structure, the inner surface of the anti-backflow port 611 is inclined. When the bottle is placed upright or at an angle, the second ball bearing 650 can form a tighter sealing relationship with the inner surface of the anti-backflow port 611 under its own weight, thereby improving the blocking effect of the anti-backflow port 611. When the second ball bearing 650 is subjected to external pressure, it can squeeze the anti-backflow port 611 downwards, causing the fracturing plates between the baffles of the anti-backflow port 611 to break due to the force, resulting in the entire anti-backflow port 611 rupturing. The anti-backflow port 611 then expands outwards, allowing the second ball bearing 650 to pass through the expanded anti-backflow port 611 and fall downwards into the bottle.
[0024] Specifically, such as Figures 1 to 3 As shown, the inner cap 300 used in this invention has a downwardly extending axially inner cap sealing ring 310 inside. The inner cap sealing ring 310 is inserted into the top opening of the bottle neck connector 200 and abuts against the inner wall of the top opening of the bottle neck connector 200 to form a sealing fit. The inner cap sealing ring 310, inserted into the top opening of the bottle neck connector 200 to form a seal, can effectively prevent backflow liquid from seeping into the gap between the bottle neck connector 200 and the inner cap 310, making up for the backflow prevention loopholes that may be caused by assembly gaps, and at the same time reducing the evaporation of wine in the bottle, ensuring the quality of the wine. The inner wall of the inner cap 300 is threadedly connected to the external thread on the outer circumference of the bottle neck connector 200 through an internal thread, and the inner cap 300 is also snapped together with the outer cap 500 through a snap-fit structure. The threaded connection between the inner cap 310 and the bottle neck connector 200, combined with the snap-fit connection between the inner cap 310 and the outer cap 500, forms a double-fixing structure. This significantly improves the stability of the inner cap 310 assembly, preventing counterfeiters from disassembling the inner cap 310 or damaging its internal structure by prying or twisting. At the same time, the threaded connection between the inner cap 310 and the bottle neck connector 200 allows consumers to open the cap normally, while the snap-fit connection between the inner cap 310 and the outer cap 500 further strengthens the stability of the entire cap, preventing loosening during transportation and storage, and ensuring stable and reliable sealing and anti-backflow functions.
[0025] Specifically, such as Figures 1 to 3As shown, the bottle neck inner component 630 of the present invention has a frustum structure with an outer diameter that gradually increases from top to bottom in the middle. Multiple upper wine outlet channels 631 are evenly distributed around the outer periphery of the frustum structure in a circumferential manner. The upper wine outlet channels 631 are connected to the lower wine outlet 621 on the lower partition 620. When the first ball bearing 640 rolls without blocking the lower wine outlet 621, the wine can flow into the upper wine outlet channel 632 through the lower wine outlet 621, and then flow out through the upper wine outlet channel 632 and out along the frustum structure. The multi-channel diversion can ensure that the wine can flow out quickly and evenly when the consumer pours wine normally, avoiding the wine not flowing smoothly. In addition, it can also reduce the disturbance of the wine to the first ball bearing 640, ensuring that the first ball bearing 640 can quickly roll back and re-block the lower wine outlet 621 after the wine is poured. The outer diameter of the frustum structure gradually increases from top to bottom. The inner cap sealing ring 310 is inserted between the bottle mouth connector 200 and the frustum structure. The outer diameter of the inner cap sealing ring 310 is slightly larger than the inner diameter of the top opening of the bottle mouth connector 200, so that the inner cap sealing ring 310 is inserted into the top opening of the bottle mouth connector 200 to form an interference fit. The top opening of the bottle mouth connector 200 squeezes the inner cap sealing ring 310, causing the inner cap sealing ring 310 to undergo radial deformation, and causing the inner cap sealing ring 310 to come into contact with the frustum structure of the bottle mouth inner part 630. Finally, the inner cap sealing ring 310 forms a sealing fit with both the outer circumferential surface of the frustum structure and the inner wall surface of the bottle mouth connector 200.
[0026] Specifically, such as Figures 1 to 3 As shown, the inner plug 610 used in this invention has an inner plug sealing ring 612 at its top, a limiting ring 613 extending radially outward in the middle of the inner plug 610, and a partition sealing ring 622 at the bottom of the partition member 620. The outer diameter of the partition sealing ring 622 gradually increases from bottom to top. The inner plug 610 forms an axial limiting fit with the bottle mouth connector 200 inside the bottle mouth connector 200 through the limiting ring 613. The inner plug sealing ring 612 is inserted between the partition sealing ring 622 and the inner wall of the bottle mouth connector 200. The outer diameter of the inner plug sealing ring 612 is slightly smaller than the inner diameter of the bottle mouth connector 200, so that the bottle mouth connector 200 squeezes the inner plug sealing ring 612 to deform it radially and make it abut against the partition sealing ring 622. The inner plug sealing ring 612 simultaneously forms a sealing fit with the outer circumferential surface of the partition sealing ring 622 and the inner wall of the bottle mouth connector 200. This invention, by defining the structure of each component of the anti-backflow valve assembly, enables the formation of multiple sealing mating points; such as... Figure 1As shown, a first seal is formed between the inner cap sealing ring 310 and the top opening of the bottle neck connector 200; a second seal is formed between the inner cap sealing ring 310 and the frustum structure of the inner bottle neck component 630; a third seal is formed between the inner stopper sealing ring 612 and the bottle neck connector 200; and a fourth seal is formed between the inner stopper sealing ring 612 and the partition sealing ring 622. Without these multiple sealing components, when the bottle is inverted without being opened, the wine inside will fill the entire cap. When the bottle is upright, the ball bearing, under its own weight, will seal the anti-backflow valve assembly. The portion of wine that has entered the empty area within the anti-backflow valve assembly cannot flow back into the bottle. If the cap is opened subsequently, the wine will splash out with the sealing ring, affecting the consumer's experience. This invention, through these multiple sealing components, prevents wine from entering the empty area within the anti-backflow valve assembly, thus avoiding splashing after opening the cap.
[0027] Furthermore, such as Figure 1 and Figure 5 As shown, the present invention configures the upper dispensing channel 631 of the bottle neck inner component 630 as a curved channel that passes through and bends from below the frustum structure, with the two openings of the upper dispensing channel 631 located on the outer and inner sides of the frustum structure, respectively. Through this structural improvement, the dispensing path between the bottle neck 100, the partition 620, and the bottle neck inner component 630 forms an S-shaped path, with multiple bends in the dispensing path. This prevents counterfeiters from using thin rods to insert into the cap and manipulate the ball bearings, ensuring that the anti-backflow function of the present invention does not fail.
[0028] Specifically, such as Figures 1 to 3 As shown, this invention features a lower limiting ring on the inner wall of the lower tube 400, and an upper limiting ring formed by the inward bending of the top of the lower tube 400. The lower limiting ring of the lower tube 400 forms an axial limiting fit with the bottom of the bottle mouth connector 200 from below, and the upper limiting ring of the lower tube 400 forms an axial limiting fit with the bottom of the inner cover 300 from above. This invention, through the upper and lower limiting rings on the lower tube 400, forms limiting fits from the bottom of the bottle mouth connector 200 and the top of the inner cover 300, respectively, stably fixing the bottle mouth connector 200 and the inner cover 300 between the upper and lower limiting positions. This prevents axial displacement of the components, ensures stable fit of the components of the anti-backflow valve assembly, and prevents failure of the anti-backflow function due to component displacement. Simultaneously, it also enhances the impact and wear resistance of the entire platform to adapt to complex environments during transportation and storage.
Claims
1. An anti-backflow bottle cap, comprising a bottle mouth connector (200), an inner cap (300), a lower tube (400), and an outer cap (500) installed on a bottle mouth (100), wherein the bottle mouth connector (200) is a through structure, the bottle mouth connector (200) is detachably connected to and communicates with the bottle mouth (100), the inner cap (300) is detachably connected to the bottle mouth connector (200) and seals the bottle mouth connector (200), the lower tube (400) is sleeved outside the bottle mouth connector (200), and the outer cap (500) is sleeved outside the inner cap (300) and abuts against the lower tube (400), characterized in that: It also includes an anti-backflow valve assembly, which includes an inner plug (610), a partition (620), a bottle neck inner component (630), a first ball bearing (640), and a second ball bearing (650); the bottom of the inner plug (610) extends into the bottle neck (100) and the bottom of the inner plug (610) is provided with an expandable anti-backflow port (611); the bottle neck inner component (630) is located on top of the bottle neck connector (200); and the partition (620) is located inside the bottle neck connector. The stopper (610) and the inner part of the bottle neck (630) are separated to form two cavities, which are connected by the lower outlet (621) at the bottom of the partition (620). The first ball (640) is movably disposed in the upper cavity, and the second ball (650) is movably disposed in the lower cavity. When the second ball (650) is subjected to downward pressure, it will open the anti-backflow port (611) and detach it from the lower cavity.
2. The anti-backflow bottle cap as described in claim 1, characterized in that: The inner cover (300) is provided with an inner cover sealing ring (310). The inner cover sealing ring (310) is inserted into the top opening of the bottle mouth connector (200). The inner cover sealing ring (310) and the inner wall of the top opening of the bottle mouth connector (200) are in close contact to form a sealing fit. The inner cover (300) is threadedly connected to the bottle mouth connector (200) and snap-fitted to the outer cover (500).
3. The anti-backflow bottle cap as described in claim 2, characterized in that: The bottle neck inner part (630) is provided with a frustum structure in the middle, and multiple upper wine outlet channels (631) are evenly distributed around the outer periphery of the frustum structure in a circumferential manner; the outer diameter of the frustum structure gradually increases from top to bottom, and the inner cap sealing ring (310) is inserted between the bottle neck connector (200) and the frustum structure. The inner cap sealing ring (310) forms a sealing fit with the outer peripheral surface of the frustum structure and the inner wall surface of the bottle neck connector (200).
4. The anti-backflow bottle cap as described in claim 3, characterized in that: The inner plug (610) has an inner plug sealing ring (612) at its top and a limiting ring (613) extending radially outward in the middle of the inner plug (610). The partition (620) has a partition sealing ring (622) at its bottom. The outer diameter of the partition sealing ring (622) gradually increases from bottom to top. The inner plug (610) forms an axial limiting fit with the bottle mouth connector (200) inside the bottle mouth connector (200) through the limiting ring (613). The inner plug sealing ring (612) is inserted between the partition sealing ring (622) and the inner wall of the bottle mouth connector (200). The inner plug sealing ring (612) forms a sealing fit with the outer circumferential surface of the partition sealing ring (622) and the inner wall of the bottle mouth connector (200).
5. The anti-backflow bottle cap as described in claim 3, characterized in that: The upper wine outlet channel (631) of the bottle neck inner component (630) is a curved channel that passes through and bends from below the frustum structure. The two openings of the upper wine outlet channel (631) are located on the outer and inner sides of the frustum structure, respectively.
6. The anti-backflow bottle cap as described in claim 1, characterized in that: The lower tube (400) has a lower limiting ring on its inner wall. The top of the lower tube (400) is bent inward to form an upper limiting ring. The lower limiting ring of the lower tube (400) forms an axial limiting fit with the bottom of the bottle mouth connector (200) from below. The upper limiting ring of the lower tube (400) forms an axial limiting fit with the bottom of the inner cover (300) from above.
7. The anti-backflow bottle cap as described in claim 1, characterized in that: The backflow prevention port (611) is an inverted cone structure composed of multiple inclined baffles arranged in a ring at intervals, with adjacent baffles connected by a breakable piece; the diameter of the backflow prevention port (611) when not unfolded is smaller than the outer diameter of the second ball (650).
8. The anti-backflow bottle cap as described in claim 1, characterized in that: The second ball (650) is a colored ball.