Bottle cap capable of preventing recharge
By employing a dual-seal structure design, combining an elastic sealing ring with a rigid/flexible sealing sheet, the problem of easy failure of traditional bottle cap seals is solved, achieving a highly efficient anti-backflow effect, suitable for food, pharmaceutical and cosmetic packaging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN LONGXIN TECH PACKING
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional bottle caps with a single-layer seal design are prone to elastic fatigue under long-term use or external pressure impact, leading to seal failure. This makes it difficult to effectively prevent malicious backfilling and high-pressure liquid penetration, posing a risk of contamination of the contents.
It adopts a dual sealing structure, including a static seal formed by the radial interference fit between the elastic sealing ring and the outer wall of the bottle mouth, and a dynamic physical isolation barrier formed by the rigid or flexible sealing sheet covering the end face of the bottle mouth. The sealing reliability is enhanced by the multi-level sealing layer and limiting groove design.
It significantly improves the reliability of backflow prevention, effectively blocking the liquid flow path under high pressure or malicious injection scenarios, simplifying the production process and adapting to irregular bottle mouth surfaces to prevent seal failure.
Smart Images
Figure CN224241674U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cap sealing structure technology, and more specifically, to a bottle cap that prevents backfilling. Background Technology
[0002] In the food, pharmaceutical, and cosmetic packaging industries, the sealing performance of bottle caps directly affects the safety and tamper-proof properties of the contents. Traditional anti-backflow technologies mostly rely on a single sealing structure, such as using threaded connections or radial pressure between an elastic sealing ring and the outer wall of the bottle opening to achieve a basic seal. However, with the increasing risks of malicious backflow (such as injection of harmful substances) and high-pressure liquid penetration, existing technologies have gradually revealed the following defects: Conventional bottle caps typically employ a single-layer sealing design (such as O-rings or threaded compression), and their static seals are prone to elastic fatigue under long-term use or external pressure impacts, leading to seal failure. Especially when subjected to malicious tool prying or high-pressure liquid injection, a single sealing structure is difficult to maintain effective isolation, posing a risk of contamination of the contents. Utility Model Content
[0003] The purpose of this invention is to provide a bottle cap that prevents backfilling, which addresses the shortcomings of existing technologies and solves the problems mentioned in the background.
[0004] The technical solution of this utility model is implemented as follows:
[0005] The utility model provides a bottle cap to prevent backflow, including a cap body that is fastened to the opening end of the bottle body, a sealing ring provided on the inner wall of the cap body, the opening end of the bottle body abutting against the sealing ring, a first sealing structure provided between the sealing ring and the opening end of the bottle body, the inner cavity of the cap body being detachably connected to the opening end of the bottle body, and a second sealing structure for covering the opening end of the bottle body installed in the annular space of the sealing ring.
[0006] In some technical solutions of this utility model, the second sealing structure includes a disc-shaped sealing sheet located inside the sealing ring. A connecting post is installed on the side of the sealing sheet away from the bottle body, and the connecting post is connected to the inner bottom wall of the cap body.
[0007] In some technical solutions of this utility model, the sealing sheet has an arc-shaped protrusion on the side opposite to the bottle opening, and the protrusion is partially embedded in the bottle opening.
[0008] In some technical solutions of this utility model, a ring-shaped sealing ring is provided on the side wall opposite to the opening of the bottle body, and the sealing ring abuts against the opening end of the bottle body.
[0009] In some technical solutions of this utility model, a wavy sealing layer is provided on the outer wall of the protruding structure, and the sealing layer abuts against the inner wall of the bottle opening.
[0010] In some technical solutions of this utility model, the first sealing structure includes a sealing gasket, a limiting groove is formed on the side wall opposite to the opening end of the bottle body, the opening end of the bottle body is embedded in the limiting groove, and the sealing gasket is installed in the limiting groove.
[0011] In some technical solutions of this utility model, the sealing gasket is connected to the outer edge of the sealing sheet.
[0012] In some technical solutions of this utility model, an internal thread is provided on the inner wall of the cap body, and an external thread that mates with the internal thread is provided on the outer wall of the bottle opening end.
[0013] Compared to existing technologies, this invention has at least the following advantages or beneficial effects: The first sealing structure forms a static sealing barrier through a radial interference fit between an elastic sealing ring and the outer wall of the bottle mouth, effectively blocking the intrusion path of external liquids by utilizing material elasticity and radial pressure. The second sealing structure forms a dynamic physical isolation barrier by covering the end face of the bottle mouth with a rigid / flexible sealing sheet, blocking the flow path of backflow liquids, providing additional protection, especially for high-pressure or malicious injection scenarios. The two work together to achieve a multi-dimensional seal of "external protection against static pressure and internal resistance to dynamic impact," significantly improving the reliability of backflow prevention. The integrated design of the sealing sheet and connecting column simplifies the manufacturing process, and axial tension ensures that the sealing sheet fits tightly against the end face of the bottle mouth, reducing leakage points through planar contact and adapting to high-pressure environments. The raised structure and wavy sealing layer are embedded in the inner wall of the bottle mouth in an arc shape, combined with multi-level wavy elastic contact points, adaptively filling the irregular surface of the inner wall of the bottle mouth, compensating for processing errors or dirt interference, while preventing malicious tools from inserting and damaging the seal. The linkage design of the limiting groove and the sealing gasket uses mechanical limiting to constrain the lateral displacement of the bottle mouth. The sealing gasket is compressed and deformed to fill the gap, and works in conjunction with the sealing sheet to form a redundant seal, avoiding local failure. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the combined structure of this utility model.
[0015] Figure 2 This is a cross-sectional structural diagram of the cover body of this utility model.
[0016] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.
[0017] Reference numerals in the attached drawings: 1. Cap body; 2. Bottle opening end; 3. Connecting post; 4. Sealing plate; 5. Sealing ring; 6. Raised structure; 7. Sealing gasket; 8. Sealing ring; 9. Sealing layer. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.
[0020] Example
[0021] This utility model provides a bottle cap to prevent backfilling, such as Figures 1-3 As shown, the device includes a cap body that snaps onto the bottle opening 2. A sealing ring 5 is provided on the inner wall of the cap body. The bottle opening 2 abuts against the sealing ring 5. A first sealing structure is provided between the sealing ring 5 and the bottle opening 2. The first sealing structure achieves a seal by matching the diameter of the sealing ring 5 with the bottle mouth (made of an elastic material) using radial pressure. The inner cavity of the cap body is detachably connected to the bottle opening 2. A second sealing structure is installed within the annular space of the sealing ring 5 to shield the bottle opening 2. The second sealing structure shields the bottle mouth with a rigid or flexible sealing sheet 4, forming a physical barrier to prevent backflow. The first sealing structure is responsible for the static seal between the outer wall of the bottle mouth and the cap, while the second sealing structure is responsible for the dynamic isolation of the inner side of the bottle mouth. Together, they effectively prevent external liquids (such as harmful substances maliciously backflowed) from entering the bottle. The working process of the above structure is as follows: When the cap body is fastened to the bottle opening 2, the sealing ring 5 on the inner wall of the cap abuts tightly against the outer wall of the bottle opening, forming the first sealing barrier; at the same time, the sealing ring 5 and the bottle opening achieve a static seal through the first sealing structure (such as interference fit or elastic compression). At this time, the inner cavity of the cap and the bottle opening are detachably connected by threads or snaps. Within the annular space of the sealing ring 5, after the second sealing structure is fixed, it covers the top of the bottle opening, dynamically preventing external liquid or gas from flowing back into the bottle through the bottle opening.
[0022] In some technical solutions of this utility model, the second sealing structure includes a disc-shaped sealing sheet 4. A connecting post 3 is installed on the side of the sealing sheet 4 facing away from the bottle body, and the connecting post 3 is connected to the inner bottom wall of the cap body. The disc-shaped sealing sheet 4 provides a large contact surface to cover the bottle cap. The axial tension (such as a spring or elastic material) of the connecting post 3 presses the bottle mouth together, and the sealing sheet 4 and the end face of the bottle mouth form a planar seal, blocking the liquid flow path. The planar contact reduces leakage points, which is especially suitable for high-pressure liquids. The integrated design of the connecting post 3 and the sealing sheet 4 simplifies the manufacturing process and improves the structural strength of both. When the bottle cap is closed, the sealing sheet 4 is pulled tightly against the end face of the bottle mouth by the connecting post 3, covering the entire opening; when the bottle cap is opened, the sealing sheet 4 is released from the bottle mouth along with the bottle cap.
[0023] In some technical solutions of this utility model, the sealing sheet 4 has an arc-shaped protrusion 6 on the side opposite to the bottle opening 2, and the protrusion 6 is partially embedded in the bottle opening 2. The arc-shaped protrusion matches the curvature of the inner wall of the bottle mouth, and achieves a tight fit through elastic deformation. The protrusion 6 embedded in the bottle mouth can prevent malicious tools from being inserted and damaging the sealing structure. When the bottle cap is closed, the protrusion 6 located on the sealing sheet 4 is embedded in the inner wall of the bottle mouth. The arc-shaped design of the protrusion makes it form an interference fit with the inner wall of the bottle mouth, further filling the internal space of the bottle mouth and improving the sealing effect.
[0024] In some technical solutions of this utility model, a ring-shaped sealing ring 8 is provided on the side wall opposite to the opening end of the bottle body 6, and the sealing ring 8 abuts against the opening end 2 of the bottle body. When the protrusion is embedded in the bottle mouth, the sealing ring 8 is squeezed and deformed, forming a ring-shaped contact zone with the inner wall of the bottle mouth. The local pressure of the ring-shaped sealing ring 5 is concentrated, which improves the sealing force per unit area. The material of the sealing ring 5 (such as silicone) can compensate for the size error or deformation of the bottle mouth. The elastic material of silicone can withstand repeated opening and closing wear.
[0025] In some technical solutions of this utility model, a wavy sealing layer 9 is provided on the outer wall of the raised structure 6, and the sealing layer 9 abuts against the inner wall of the bottle opening 2. When the wavy sealing layer 9 on the outer wall of the raised structure 6 contacts the inner wall of the bottle mouth when the bottle cap is closed, the crests and troughs of the wavy structure are compressed and deformed, adaptively filling the irregular surface of the inner wall of the bottle mouth. The wavy sealing layer 9 provides multi-level elastic contact points for the sealing of the above structure, adapting to the processing errors or dirt interference of the inner wall of the bottle mouth, and the wavy layer increases the contact area, preventing the sealing sheet 4 from shifting due to vibration or pressure changes.
[0026] In some technical solutions of this utility model, the specific structure of the first sealing structure is as follows: a limiting groove is formed on the side wall of the sealing ring 5 opposite to the bottle opening end 2, the bottle opening end 2 is embedded in the limiting groove, and a sealing gasket 7 is provided in the limiting groove that contacts the bottle opening end 2. The sealing gasket 7 in the limiting groove is deformed under pressure, filling the gap between the bottle mouth and the limiting groove. At the same time, the bottle mouth is mechanically fixed by the side wall of the limiting groove. The depth and width of the limiting groove constrain the position of the bottle mouth, preventing lateral displacement and avoiding the problem of loose bottle cap and unreliable sealing. The sealing gasket 7 (such as an O-ring) achieves radial secondary sealing after being compressed in the limiting groove.
[0027] In some technical solutions of this utility model, the sealing gasket 7 is connected to the outer edge of the sealing sheet 4. When the bottle cap is closed, the sealing sheet 4 is pressed down, causing the sealing gasket 7 to deform synchronously in the limiting groove, forming a linkage sealing effect, avoiding local sealing failure. The sealing gasket 7 and the sealing sheet 4 are pre-connected, reducing assembly steps.
[0028] In some technical solutions of this utility model, an internal thread is provided on the inner wall of the cap body, and an external thread that mates with the internal thread is provided on the outer wall of the bottle opening end 2. The cap body engages with the external thread of the bottle opening through the internal thread. When the bottle cap is rotated, the thread converts the rotational motion of the two into axial pressure, pushing the sealing ring 5 and the sealing plate 4 to press against the bottle opening. During the tightening process, the sealing structure is gradually compressed to avoid instantaneous overload.
[0029] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A bottle cap for preventing backfilling, characterized in that, The cap body is attached to the bottle opening (2). A sealing ring (5) is provided on the inner wall of the cap body. The bottle opening (2) abuts against the sealing ring (5). A first sealing structure is provided between the sealing ring (5) and the bottle opening (2). The inner cavity of the cap body is detachably connected to the bottle opening (2). A second sealing structure is installed in the annular space of the sealing ring (5) to cover the bottle opening (2).
2. The anti-backflow bottle cap according to claim 1, characterized in that, The second sealing structure includes a disc-shaped sealing sheet (4) located inside a sealing ring (5). A connecting post (3) is installed on the side of the sealing sheet (4) away from the bottle body, and the connecting post (3) is connected to the inner bottom wall of the cap body.
3. A bottle cap for preventing backfilling according to claim 2, characterized in that, The sealing sheet (4) has an arc-shaped protrusion (6) on the side opposite to the bottle opening end (2), and the protrusion (6) is partially embedded in the bottle opening end (2).
4. A bottle cap for preventing backfilling according to claim 3, characterized in that, The protruding structure (6) has an annular sealing ring (8) on the side wall opposite to the opening end of the bottle body, and the sealing ring (8) abuts against the opening end (2) of the bottle body.
5. A bottle cap for preventing backfilling according to claim 3 or 4, characterized in that, The outer wall of the protruding structure (6) is provided with a wavy sealing layer (9), which abuts against the inner wall of the bottle opening end (2).
6. A bottle cap for preventing backfilling according to any one of claims 2-4, characterized in that, The first sealing structure includes a sealing gasket (7), and a limiting groove is formed on the side wall of the sealing ring (5) opposite to the bottle opening end (2). The bottle opening end (2) is embedded in the limiting groove, and the sealing gasket (7) is installed in the limiting groove.
7. A bottle cap for preventing backfilling according to claim 6, characterized in that, The sealing gasket (7) is connected to the outer edge of the sealing sheet (4).
8. A bottle cap for preventing backfilling according to claim 1, characterized in that, The inner wall of the cap body is provided with an internal thread, and the outer wall of the bottle opening end (2) is provided with an external thread that engages with the internal thread.