Bottle cap sealing structure

Abstract

The utility model discloses a bottle lid sealing structure, including bottle lid, bottle lid is equipped in the neck part of bottle, and bottle lid is hollow structure, and the inner wall of bottle lid is detachably installed with first sealing washer, and the inner mouth of bottle is detachably installed with second sealing washer, and the upper surface of second sealing washer is equipped with frosted layer, and the frosted layer is used for destroying the interface smooth state between it and first sealing washer, and reduces the adhesion strength, and the center of second sealing washer upper surface is equipped with first recess, and still is equipped with cross groove through to first recess, and extends to the central region from the outer periphery of second sealing washer, when bottle lid opens, and first sealing washer and second sealing washer separate. The utility model discloses through second sealing washer upper surface setting full coverage frosted layer, and cross groove and first recess intercommunication form shallow cutout deep recess cavity's step structure, when opening bottle lid, and the sealing washer of bottle mouth still can continue sealing.

Description

Technical Field

[0001] This utility model relates to the field of bottle cap sealing technology, specifically to a bottle cap sealing structure. Background Technology

[0002] In the packaging of food, pharmaceuticals, health products, cosmetics, and daily chemical products, bottle containers widely adopt a structure that combines a bottle cap with a sealing gasket to achieve airtight or liquid-tight sealing of the contents. To improve sealing reliability, some high-requirement products adopt a double-layer sealing structure, that is, a first sealing gasket is set inside the bottle cap and a second sealing gasket is installed at the end of the bottle mouth, forming a double protective barrier to effectively prevent air, moisture or contaminants from entering and extend the product's shelf life.

[0003] In the prior art, CN202321448202.3 discloses a sample bottle sealing plug structure that prevents detachment. By adding a rigid support to the sealing plug, the sealing plug is prevented from easily deforming under external force, maintaining its original shape and ensuring that the flange edge with anti-detachment function remains within the bottle cap buckle. Thus, when the sampling needle is inserted or removed, the sealing plug remains inside the bottle cap, preventing it from falling off. However, when the bottle cap is unscrewed, as the sealing gasket on the bottle cap rises, the volume inside the chamber expands rapidly, and the negative pressure further increases, generating an upward adsorption force on the sealing gasket at the bottle mouth. More seriously, if the contact surfaces of the two sealing gaskets are smooth and made of similar materials, such as both being rubber, a "cold flow" phenomenon or surface adhesion may occur between the materials under long-term contact. This causes the sealing gasket, which should remain at the bottle mouth to continue its sealing function, to fall off along with the sealing gasket on the bottle cap during the opening process, resulting in leakage from the bottle. Utility Model Content

[0004] The purpose of this utility model is to provide a bottle cap sealing structure that has a reasonable structure and can maintain a continuous seal at the bottle opening after the bottle cap is opened.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A bottle cap sealing structure includes a bottle cap, which is fitted onto the neck of a bottle. The bottle cap has a hollow structure. A first sealing gasket is detachably installed on the inner wall of the bottle cap. A second sealing gasket is detachably installed on the inner opening of the bottle. The upper surface of the second sealing gasket is provided with a frosted layer, which is used to disrupt the smooth interface between the second sealing gasket and the first sealing gasket and reduce the adhesion strength. A first groove is provided in the center of the upper surface of the second sealing gasket, and a cross groove is also provided that penetrates into the first groove and extends from the outer periphery of the second sealing gasket to the central area. When the bottle cap is opened, the first sealing gasket and the second sealing gasket separate. The outer periphery of the second sealing gasket is provided with a radially protruding limiting side plate, which can be embedded in the corresponding annular groove on the inner wall of the bottle.

[0006] Preferably, the first groove is a circular groove with a diameter of 1 / 3 to 2 / 3 of the outer diameter of the second sealing gasket and a depth of 0.5 mm to 2.0 mm.

[0007] Preferably, the width of the cross groove is 0.2mm to 1.0mm and the depth is 0.3mm to 1.5mm, and the depth of the cross groove is less than the depth of the first groove.

[0008] Preferably, the groove wall of the cross groove and the side wall of the first groove form an arc transition at the intersection area, and the two are connected to form a stepped recessed structure.

[0009] Preferably, the frosted structure on the upper surface of the second sealing gasket covers the entire area of ​​the upper surface of the second sealing gasket, and the surface roughness Ra value is 6.5μm to 12.5μm.

[0010] Preferably, the first sealing gasket is fixed in the stepped hole on the inner wall of the bottle cap by interference fit. The bottle cap is installed on the bottle mouth, and the lower end face of the first sealing gasket contacts the upper end face of the second sealing gasket but does not cover the entire upper surface.

[0011] Preferably, the second sealing gasket is a one-piece molded structure, and the cross groove consists of two straight cuts, with adjacent straight cuts arranged perpendicularly.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention enhances the microscopic interlocking force between the second sealing gasket 4 and the bottle cap and bottle mouth by setting a full-coverage frosted layer on the upper surface of the second sealing gasket 4, with the Ra value controlled within a medium roughness range of 6.5 to 12.5 μm. At the same time, the first sealing gasket is only pressed into the middle, forming a "progressive compression" that allows elastic compensation in the outer area. Combined with the pre-compression of the center of the first sealing gasket, the cross groove and the first groove are connected to form a stepped structure with shallow cut and deep concave cavity, guiding the stress to smoothly extend to the central buffer zone along a predetermined path. When the bottle cap is opened, the first sealing gasket and the second sealing gasket separate, but the second sealing gasket can still continue to seal. Compared with the prior art, where the sealing gasket on the bottle mouth is pulled out along with the sealing gasket on the bottle cap when the bottle cap is opened, this invention solves the problem that the sealing gasket on the bottle mouth can still continue to seal after the bottle cap is opened. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is an exploded view of the overall three-dimensional structure of this utility model; Figure 3 This is a three-dimensional structural diagram of the second sealing gasket of this utility model; Figure 4 This is a schematic diagram of the second sealing gasket structure of this utility model; Figure 5This is a schematic diagram of the overall cross-sectional structure of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the bottle cap of this utility model.

[0014] Reference numerals in the attached drawings: 1. Bottle cap; 2. Bottle body; 3. First sealing gasket; 4. Second sealing gasket; 5. First groove; 6. Cross groove; 7. Limiting side plate. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] To address the problem in existing bottle cap sealing structures where the sealing gasket at the bottle opening is pulled off along with the sealing gasket on the bottle cap during use, the following technical solution is provided. Please refer to [link / reference]. Figures 1-6 ; Refer to the instruction manual appendix Figure 5-6 The bottle cap sealing structure includes a bottle cap 1, which is fitted onto the neck of a bottle body 2. The bottle cap 1 has a hollow structure and a stepped hole is provided on the inner wall of the open end of the bottle cap 1. The stepped hole inside the bottle cap 1 is used to install a first sealing gasket 3. The first sealing gasket 3 is fixed in the stepped hole on the inner wall of the bottle cap 1 by interference fit, which is firmly installed and not easy to loosen.

[0017] Refer to the instruction manual appendix Figure 2-4 The opening of the bottle body 2 is equipped with a second sealing gasket 4. The second sealing gasket 4 is an integral molded structure. It is preferably made of silicone rubber, EPDM rubber or thermoplastic elastomer, with a Shore hardness of 40A to 70A. It has good resilience, low compression set and chemical corrosion resistance, and is suitable for high hygiene requirements such as food and medicine. The upper surface of the second sealing gasket 4 is provided with a frosted layer, which covers the entire area of ​​the upper surface of the second sealing gasket 4, and the surface roughness Ra value is 6.3μm~12.5μm. The medium roughness range can ensure sufficient micro-contact area to improve sealing performance, while avoiding scratching the inner wall of the bottle cap 1. During transportation vibration or temperature change, the frosted structure can effectively suppress micro-slippage between the second sealing gasket 4 and the bottle cap 1 by enhancing the micro-interlocking force between the interfaces, thus significantly improving the dynamic sealing reliability. It is worth noting that the second sealing gasket 4 is integrally formed by injection molding or compression molding, wherein the frosted structure is formed by mold etching to create a coarse texture, and the texture grade is S4.

[0018] Refer to the instruction manual appendix Figure 2-3 A first groove 5 is formed at the center of the upper surface of the second sealing gasket 4. The first groove 5 is a circular groove with a diameter of 1 / 3 to 2 / 3 of the outer diameter of the second sealing gasket 4 and a depth of 0.5 mm to 2.0 mm. The size design makes the central area a moderately weak area, which facilitates stress concentration when opening. At the same time, a complete sealing band of not less than 1 / 3 of the total radius is retained on the periphery to ensure an effective axial sealing contact area. During the locking process of the bottle cap 1, the first groove 5 provides axial compression space for the second sealing gasket 4 and allows it to expand radially, thereby improving the fit with the bottle body 2.

[0019] Refer to the instruction manual appendix Figure 2-3 The second sealing gasket 4 is also provided with a cross groove 6 that extends into the first groove 5. The cross groove 6 consists of two straight cuts, which are perpendicular to each other. It extends from the outer periphery of the second sealing gasket 4 to the central area and communicates with the first groove 5. The cut width of the cross groove 6 is 0.2mm to 1.0mm and the depth is 0.3mm to 1.5mm. Its depth is less than the depth of the first groove 5, ensuring that the cross groove 6 does not penetrate the entire sealing layer. In the unopened state, it achieves self-closing sealing by the elasticity of the material itself to prevent liquid or gas leakage. At the same time, the narrow width and shallow depth significantly reduce tear resistance and facilitate manual opening.

[0020] Furthermore, the groove wall of the cross groove 6 and the side wall of the first groove 5 form an arc transition at the intersection area, and the two are connected to form a stepped recessed structure. The arc transition can smoothly distribute stress, control the crack to only extend along the predetermined cross path and not spread to the surroundings. Moreover, the smooth and continuous curved surface has no sharp corners or dead corners, making it less likely to accumulate liquid or residue, and cleaning and sterilization are more thorough, which is beneficial to the hygiene and safety of pharmaceutical and food containers. In addition, the stepped structure forms a "low resistance channel", which guides the tearing behavior during opening to the central groove naturally, realizing a stable opening process.

[0021] Refer to the instruction manual appendix Figure 2-3 The outer periphery of the second sealing gasket 4 is provided with a radially protruding limiting side plate 7. Furthermore, the limiting side plate 7 contains a steel ring to prevent the second sealing gasket 4 from being pressed into the bottle body 2 under high pressure. The limiting side plate 7 can be embedded in the corresponding annular groove on the inner wall of the bottle body 2 to achieve axial positioning and circumferential anti-rotation fixation. The snap-fit ​​structure can effectively prevent the second sealing gasket 4 from axial movement or rotational displacement during assembly, transportation or use, suppress the risk of falling off, and improve assembly accuracy and product consistency. Refer to the instruction manual appendix Figure 5The lower end face of the first sealing gasket 3 contacts the upper end face of the second sealing gasket 4 but does not cover the entire upper surface. The first sealing gasket 3 only partially presses against the upper surface of the second sealing gasket 4, so that the pressure is concentrated in the central area, achieving a progressive seal by first pre-pressing the middle and then bonding the whole. When the bottle body 2 is subjected to vibration or temperature change, the uncovered area can slightly deform to compensate for the stress, avoiding detachment or leakage due to rigid full pressure.

[0022] Working principle: First, the integrally formed second sealing gasket 4 is installed at the opening of the bottle body 2. The limiting side plate 7 on its outer periphery can be embedded in the annular groove on the inner wall of the bottle body 2 to achieve axial positioning and circumferential fixation, preventing displacement or falling off. Next, the first sealing gasket 3 is pressed into the stepped hole on the inner wall of the bottle cap 1 through interference fit, which is firmly fixed and not easy to loosen. The bottle cap 1 is put on the neck of the bottle body 2 and tightened or pressed. The lower end face of the first sealing gasket 3 contacts the middle area of ​​the upper surface of the second sealing gasket 4 but does not completely cover it, forming a local compression seal. Then, the micro-interlocking force between the second sealing gasket 4 and the bottle mouth 2 is enhanced by the frosted layer, which improves the friction and fit. The first sealing gasket 3 applies a central pre-pressure to the second sealing gasket 4 to form a "progressive compression" seal. During transportation vibration or temperature changes, the frosted layer effectively suppresses the micro-slippage of the sealing interface. The uncovered area can undergo elastic micro-deformation to compensate for stress and avoid seal failure. The limiting side plate 7 prevents the second sealing gasket 4 from rotating or moving axially. Although the cross groove 6 is a cut, its depth is less than the depth of the first groove 5 and does not penetrate the entire sealing layer. Relying on the rebound of the material of the second sealing gasket 4, the cut closes naturally and there is no leakage channel. When the user pinches the bottle cap 1 and pulls it upwards or makes a slight rotation, the second sealing gasket 4 is subjected to tensile and shear forces. The stress is concentrated at the beginning of the cross groove 6. Due to the narrow cut width, the initial tear resistance is low. The crack extends steadily from the outer periphery to the center along the two vertical cuts. The end of the cross groove 6 enters the area of ​​the first groove 5, which is a circular groove, forming a stress release zone. The use of arc transition and stepped concave structure between the groove walls allows the crack to propagate smoothly and avoids sudden breakage. At this time, the first sealing gasket 3 opens with the bottle cap 1, while the second sealing gasket 4 continues to keep the bottle mouth 2 sealed. If used in reusable packaging containers, the damaged second sealing gasket 4 can be removed and cleaned after opening. Because its surface has no sharp edges and few dead corners, pollutants are not easy to remain, making cleaning convenient. Afterwards, a new second sealing gasket 4 can be replaced and resealed to achieve environmentally friendly reuse.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A bottle cap sealing structure, comprising a bottle cap (1), the bottle cap (1) being fitted onto the neck of a bottle body (2), the bottle cap (1) being a hollow structure, characterized in that: The inner wall of the bottle cap (1) is detachably fitted with a first sealing gasket (3), and the inner opening of the bottle body (2) is detachably fitted with a second sealing gasket (4). The upper surface of the second sealing gasket (4) is provided with a frosted layer. The frosted layer is used to disrupt the smooth interface between it and the first sealing gasket (3) and reduce the adhesion strength. The center of the upper surface of the second sealing gasket (4) is provided with a first groove (5), and a cross groove (6) is provided that penetrates into the first groove (5) and extends from the outer periphery of the second sealing gasket (4) to the central area. When the bottle cap (1) is opened, the first sealing gasket (3) and the second sealing gasket (4) are separated. The outer periphery of the second sealing gasket (4) is provided with a radially protruding limiting side plate (7), which can be embedded in the corresponding annular groove on the inner wall of the bottle body (2).

2. The bottle cap sealing structure according to claim 1, characterized in that: The first groove (5) is a circular groove with a diameter of 1 / 3 to 2 / 3 of the outer diameter of the second sealing gasket (4) and a depth of 0.5 mm to 2.0 mm.

3. The bottle cap sealing structure according to claim 1, characterized in that: The width of the cross groove (6) is 0.2mm to 1.0mm and the depth is 0.3mm to 1.5mm. The depth of the cross groove (6) is less than the depth of the first groove (5).

4. The bottle cap sealing structure according to claim 3, characterized in that: The groove wall of the cross groove (6) and the side wall of the first groove (5) are connected in an arc transition at the intersection area, and the two are connected to form a stepped recessed structure.

5. The bottle cap sealing structure according to claim 1, characterized in that: The frosted structure on the upper surface of the second sealing gasket (4) covers the entire area of ​​the upper surface of the second sealing gasket (4), and the surface roughness Ra value is 6.5μm~12.5μm.

6. The bottle cap sealing structure according to claim 5, characterized in that: The first sealing gasket (3) is fixed in the stepped hole on the inner wall of the bottle cap (1) by interference fit. The bottle cap (1) is installed on the bottle body (2). The lower end face of the first sealing gasket (3) is in contact with the upper end face of the second sealing gasket (4) but does not cover the entire upper surface.

7. The bottle cap sealing structure according to claim 6, characterized in that: The second sealing gasket (4) is an integrally molded structure, and the cross groove (6) consists of two straight cuts, with adjacent straight cuts set perpendicularly.

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