Packaging container bottle cap
By designing an interlocking structure for the outer cap, inner cap, and middle cap, the problem of insufficient sealing of the bottle cap during transportation, liquid infusion, and rinsing was solved, improving the yield rate and sealing effect, and simplifying the manufacturing process.
Patent Information
- Application Number
- CN202422312177.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Existing bottle caps have insufficient sealing properties during transportation, infusion, and rinsing, leading to leakage of the medicine. At the same time, the manufacturing process is complex and the yield rate is low.
A bottle cap for a packaging container has been designed, including an outer cap, an inner cap, and a middle cap. The positioning and sealing connection between the outer cap, the middle cap, and the inner cap are achieved through the meshing of the inner and outer teeth and the cooperation of the positioning part and the mating part, thereby reducing the risk of leakage and simplifying the manufacturing process.
It improved the yield rate of bottle cap production and assembly, reduced the risk of leakage during infusion, ensured sealing during transportation, simplified the manufacturing process, and improved the overall sealing effect.
Smart Images
Figure CN223619282U_ABST
Abstract
Description
Technical Field
[0001] This disclosure pertains to the field of packaging container technology, and more specifically relates to a packaging container cap. Background Technology
[0002] Packaging containers are sealed with caps, but when the contents of the container need to be used, the cap becomes an obstacle. For example, medicine bottles sometimes contain liquid medicine for infusion and sometimes for rinsing. The cap needs to provide good functionality for different purposes and maintain good sealing to prevent leakage during transportation.
[0003] In existing technologies, multi-purpose packaging container caps have emerged to support three uses—transport sealing, infusion, and rinsing—using a single cap. These caps typically use a gasket to weld the rubber stopper to the inside of the outer cap, thus achieving a seal for the medication. However, the outer cap and gasket are usually separate parts. Welding these separate components together increases the manufacturing process steps, thereby increasing production costs. Furthermore, in areas prone to leakage, such as the contact area between the inner cap and the gasket, the direct contact allows the medication to potentially leak out along the gaps. Utility Model Content
[0004] This disclosure is made based on the above-mentioned needs of the prior art. The technical problem to be solved by this disclosure is to provide a packaging container cap that supports both infusion and rinsing operations, while meeting the requirements of good sealing performance during transportation, reducing the risk of leakage during infusion, and having a good yield rate during manufacturing.
[0005] To address the aforementioned problems, the technical solutions provided in this disclosure include:
[0006] A bottle cap for a packaging container, characterized in that it comprises: an outer cap, the outer cap having a cylindrical outer cap body and an outer cap plate disposed on the outer cap body, the inner side of the outer cap body being provided with a first positioning part and inner teeth, and the outer cap plate being provided with an injection port; an inner cap, the inner cap being disposed inside the outer cap, comprising a cylindrical inner cap body and an inner cap plate disposed on the inner cap body, the outer side of the inner cap body being provided with outer teeth that engage with and position the inner teeth, and the outer surface of the inner cap being provided with a second positioning part; the inner cap plate being provided with a rinsing port; and a middle cap, the middle cap comprising a cylindrical middle cap body and an outer cap plate being provided with an injection port; A middle cover plate is placed on the middle cover body. The outer peripheral surface of the middle cover body is provided with a first mating part that engages with the first positioning part and a second mating part that engages with the second positioning part. A rubber plug is disposed between the outer cover and the middle cover, forming an elastic and sealing connection with the outer cover and the middle cover. When the outer cover body and the inner cover body are locked by the inner teeth and the outer teeth, the first positioning part and the first mating part abut against each other and form a positioning and sealing connection between the outer cover and the middle cover, and the second positioning part and the second mating part abut against each other and form a positioning and sealing connection between the middle cover and the inner cover.
[0007] Preferably, the first positioning part includes a groove formed on the inner wall of the outer cover cylinder, the groove opening inward; the first mating part includes a protrusion formed on the outer peripheral surface of the middle cover, the protrusion being accommodated in the groove and abutting against the groove to complete positioning and sealing connection.
[0008] Preferably, the groove width in the vertical direction is greater than the height of the protrusion in the vertical direction.
[0009] Preferably, the raised upper or lower surface is formed as an inclined plane.
[0010] Preferably, the second positioning part is located below the first positioning part.
[0011] Preferably, the second positioning part includes a positioning post extending from the outer peripheral surface of the inner cover, the positioning post having a top surface, an inner surface, and an outer surface; the second mating part includes a vertical contact surface extending downward on the peripheral surface of the middle cover and a horizontal contact surface extending at the top of the vertical contact surface; wherein the vertical contact surface abuts against the inner surface of the positioning post, and the horizontal contact surface abuts against the top surface of the positioning post.
[0012] Preferably, a protrusion is provided on the outer wall of the vertical contact surface.
[0013] Preferably, the upper part of the inner wall of the cylindrical inner cover gradually narrows from bottom to top to form a rinsing opening that is wider at the bottom and narrower at the top.
[0014] Preferably, the second positioning part includes an inner sidewall, an outer sidewall, a bottom surface, and an outer sidewall end face; the inner sidewall extends downward from the sidewall of the rinsing port, the bottom surface extends outward from the bottom of the inner sidewall, the outer sidewall extends upward from the outside of the bottom surface, and the bottom of the outer sidewall is at least partially engaged with the cylinder of the inner cover.
[0015] Preferably, the inner teeth and the outer teeth are positioned and engaged in a first region; the outer cover and the inner cover are fixedly connected to each other in a second region outside the first region; a detachable tear ring is provided on the outer side wall of the outer cover between the first region and the second region, the tear ring being operable to separate the first region and the second region of the outer cover to allow the first region to be operated independently.
[0016] Preferably, the top surface of the inner cover plate is provided with an inner cover operation part, which operably covers the flushing port, and the top surface of the inner cover plate is higher than the upper surface of the cylindrical inner cover body in the vertical direction.
[0017] Compared with the prior art, this utility model improves the yield rate in bottle cap production and assembly by positioning and sealing the middle cap with the inner and outer caps respectively, and reduces the probability of leakage of the liquid contained in the bottle during infusion due to the sealing of the inner cap. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.
[0019] Figure 1 This is a structural diagram of the dual-purpose infusion and flushing bottle cap in a specific embodiment of this utility model;
[0020] Figure 2 This is a structural diagram of the outer cover in a specific embodiment of this utility model;
[0021] Figure 3 This is a structural diagram of the rubber stopper in a specific embodiment of this utility model;
[0022] Figure 4 This is a structural diagram of the middle cover in a specific embodiment of this utility model;
[0023] Figure 5 This is a structural diagram of the inner cover in a specific embodiment of this utility model.
[0024] Figure label:
[0025] 1. Outer cover; 1-1. Outer cover sealing sheet; 1-2. Outer cover operating part; 1-3. Inner teeth; 1-4. First positioning part; 1-5. Outer cover plate protrusion; 1-6. Tear ring; 2. Rubber stopper; 2-1. Rubber stopper groove; 3. Middle cover; 3-1. First mating part; 3-2. Second mating part; 4. Inner cover; 4-1. Second positioning part; 4-1-1. Inner side wall; 4-1-2. Outer side wall; 4-1-3. Bottom surface; 4-1-4. Outer side wall end face; 4-2. Outer teeth; 4-3. Inner cover sealing sheet; 4-4. Inner cover operating part. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] In the description of the embodiments of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a direct connection; or it can be an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0028] The terms “at the bottom of”, “at the top of”, and “on” used throughout the text refer to the relative positions of the components of the device, regardless of their orientation in space.
[0029] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.
[0030] In the field of packaging container technology, taking medicine bottles as an example, when the medicine stored in the bottle needs to be used for both rinsing and infusion, a multi-purpose cap is often used to seal the bottle. Multi-purpose caps typically have a rinsing opening at the bottom and an opening at the top for infusion or medication administration. When infusion is needed, the tubing is pierced through both the infusion and rinsing openings to draw the medicine from the bottle. When rinsing is needed, the rinsing port on the inner cap is opened, through which the rinsing medicine is supplied. These caps have a complex structure and many components, making them prone to leakage during transportation and infusion operations. Furthermore, they require high precision in manufacturing and assembly; even slight misalignment results in a defective product. Therefore, the yield rate of these caps has consistently been low.
[0031] Therefore, such as Figures 1-5 As shown in the figure, this specific embodiment provides a packaging container cap for dual-purpose infusion flushing. The cap includes an outer cap 1, a rubber stopper 2, a middle cap 3, and an inner cap 4.
[0032] The outer cover 1 is arranged longitudinally, such as Figure 1 As shown, the opening of the outer cover faces downwards, and the opening extends upwards to form a hollow space, which provides space to accommodate the inner cover 4, the middle cover 3 and the rubber stopper 2.
[0033] The outer cover 1 has an outer cover plate on its top, and an infusion port is provided on the outer cover plate. An outer cover sealing piece 1-1 is provided in the infusion port. The outer cover sealing piece and the infusion port are sealed around the perimeter to prevent liquid leakage from the infusion port during production and transportation. The top of the outer cover sealing piece is fixedly connected to the outer cover operating part 1-2. When subjected to a pulling force applied by the outer cover operating part, the outer cover sealing piece 1-1 can be pulled off from the outer cover to expose the infusion port.
[0034] Preferably, the outer cover operating part 1-2 can be configured in the shape of a pull ring, which is located on the top of the outer cover 1. The pull ring is suitable for the outer cover 1 with a large area so that it is easy for a person to pull the pull ring to separate the outer cover sealing piece 1-1 from the outer cover and expose the infusion port.
[0035] The outer cover operating part 1-2 can preferably be configured in a folding shape, which is suitable for outer covers 1 with a smaller area. A thinning part or a modified part is provided on the side of the outer cover. After the thinning part or the modified part is bent by hand, it is broken, thereby separating the outer cover sealing piece 1-1 from the outer cover 1 and exposing the infusion port.
[0036] The outer cover sealing sheet 1-1 can be integrally formed with the outer cover plate, or it can be attached to the outer cover plate. In order to facilitate the removal of the outer cover sealing sheet from the cover plate, a thinned area is provided at the connection position between the outer cover sealing sheet and the outer cover plate, thereby facilitating the separation of the outer cover sealing sheet from the outer cover plate.
[0037] The inner wall surface of the outer cap 1 is formed with internal teeth 1-3, which are preferably internal threads. The internal teeth are used to engage with external teeth 4-2 on the inner cap 4, and the external teeth are preferably external threads, thereby providing a holding force to position and seal all components of the bottle cap. For example, the thread engagement between the internal and external threads generates a large biting force, preventing the outer cap operating part 1-2 from separating from the outer cap plate due to insufficient biting force between the outer cap and the inner cap during high-temperature and high-pressure sterilization after dispensing the medicine, thus affecting the sealing effect of the entire bottle (including the bottle cap).
[0038] The inner wall surface of the outer cover 1 is also formed with a first positioning part 1-4, which abuts against and connects with a first mating part on the middle cover 3 to form positioning and sealing between the outer cover and the middle cover.
[0039] The middle cover 3 is disposed in the receiving space inside the outer cover 1, and the middle cover is also disposed with its opening facing downward. A rubber stopper 2 is disposed between the cover plate of the outer cover and the cover plate of the middle cover. The bottom surface of the rubber stopper is in contact with the upper surface of the middle cover body, and the remaining peripheral surface of the rubber stopper is in contact with the inner wall of the outer cover.
[0040] When the outer cap 1 is in the locked position of the bottle cap, the outer cap squeezes the rubber stopper, on the one hand, it presses and deforms the rubber stopper 2 so as to fill the space between the outer cap 1 and the middle cap 3 more tightly, and on the other hand, when the rubber stopper is elastically deformed, it applies a downward force to the middle cap 3 to complete the locking and positioning between the middle cap and the outer cap 1, and between the middle cap 3 and the inner cap 4.
[0041] To stabilize the positional relationship between the outer cover 1 and the rubber stopper 2, a protrusion 1-5 is preferably provided on the inner wall surface of the outer cover plate, and a groove 2-1 corresponding to the protrusion is provided on the upper surface of the rubber stopper. The position of the rubber stopper in the left-right direction is limited by the protrusion and the groove. Correspondingly, a protrusion can also be provided on the rubber stopper, and a groove can be provided on the inner wall surface of the outer cover plate.
[0042] The outer cap 1 and inner cap 4 are welded together radially at one end near the bottle opening, and the assembly of the outer and inner caps is positioned on the bottle opening. Preferably, a removable tear ring 1-6 is provided on the outer circumferential surface of the outer cap between the first area where the inner and outer caps are threadedly engaged and the second area where the inner and outer caps are welded near their lower end faces. This tear ring can be torn off the outer cap under external force, thereby separating the first and second areas, allowing independent operation of the threaded connection between the outer and inner caps. For example, when a large volume of liquid needs to be poured out for rinsing, the tear ring 1-6 can be torn open first, and then the outer cap 1 can be unscrewed from the inner cap 4 by disengaging the threaded engagement between the internal thread on the inner wall of the outer cap 1 and the external thread on the outer wall of the inner cap 4. This allows the outer cap 1, the rubber stopper 2, and the middle cap 3 to be removed from the inner cap, exposing the inner cap 4.
[0043] It should be noted that, in this specific embodiment, the first region and the second region can be positioned within the first region even if the first region is excessively long, i.e., located between a portion of the first region and the second region, as long as separation between the first region and the second region is achievable. Once the first region and the second region are separated, the unscrewing or other operations of the outer cap relative to the inner cap are no longer synchronized with the inner cap, allowing the outer cap to be easily removed from the bottle opening, thereby exposing the rinsing port on the inner cap for rinsing purposes.
[0044] The middle cover 3 also includes a middle cover plate and a middle cover sidewall extending downward from the middle cover plate. The top surface of the middle cover plate is fitted with the rubber stopper. A protrusion may also be provided on the top surface of the middle cover plate, and a groove corresponding to the protrusion is provided on the lower surface of the rubber stopper. The position of the rubber stopper in the left-right direction is limited by the protrusion and the groove. Correspondingly, a protrusion may also be provided on the rubber stopper, and a groove may be provided on the top surface of the middle cover plate. Furthermore, the cooperation between the protrusion on the middle cover plate and the groove on the rubber stopper enables the installation and positioning between the outer cover 1, the rubber stopper 2, and the middle cover 3, making it easy to install the rubber stopper in a predetermined and suitable position during installation.
[0045] The sidewall of the middle cover 3 extends downward from the middle cover plate. A first mating part 3-1 and a second mating part 3-2 are provided on the sidewall of the middle cover. The first mating part and the first positioning part 1-4 provided on the outer cover are vertically aligned and abut against each other, thereby forming an engagement between the outer cover 1 and the middle cover 3 under the elastic force of the rubber stopper 2. This achieves both positioning between the outer cover and the middle cover and sealing of the connection between them. The second mating part 3-2 of the middle cover and the second positioning part 4-1 provided on the inner cover 4 are vertically aligned and abut against each other, thereby forming an engagement between the outer cover 1 and the middle cover 3 under the elastic force of the rubber stopper 2. This achieves both positioning between the inner cover and the middle cover and sealing of the connection between them.
[0046] The inner cap 4 is disposed inside the middle cap 3 and includes a cylindrical cap body portion and a rinsing port. The lower end of the cylindrical cap body portion of the inner cap has a downward-facing opening, which is used to seal with the medicine bottle; the other end, i.e., the upper end, of the cylindrical cap body portion of the inner cap is formed as an inner cap plate, and a rinsing port is provided in the middle of the inner cap plate. The rinsing port extends through the inner cap plate in the vertical direction to provide an outlet for the liquid in the medicine bottle to flow to the outside through the cylindrical inner cap.
[0047] The outermost surface of the inner cover 4 is provided with external teeth 4-2, which are preferably formed as external threads. The external threads are used to cooperate with the internal threads of the outer cover to form a relative locking between the upper and lower positions of the inner cover and the outer cover. For example, the external threads 4-2 can be provided on the outer surface of the outer wall of the second positioning part 4-1 and / or on the outer surface of the inner cover cylinder part, that is, at a position further outward than the second positioning part. In this way, when the second positioning part cooperates with the middle cover 3, the threaded cooperation between the outer cover 1 and the inner cover 4 will not be affected by the middle cover.
[0048] An inner cover sealing plate 4-3 is provided on the rinsing port of the inner cover 4, and an inner cover operating part 4-4 is provided on the upper surface of the inner cover sealing plate. The inner cover sealing plate 4-3 is sealed to the upper end face of the inner cover. The sealing connection can be formed by integrally molding the inner cover sealing plate and the upper end face of the inner cover, or by forming a seal between the inner cover sealing plate and the inner cover by bonding. In this way, the first seal for the liquid in the medicine bottle is formed during production and transportation. A thinning part is provided between the inner cover sealing plate 4-3 and the upper end face of the inner cover. The thinning part can be a groove provided on the surface of the inner cover sealing plate. The groove is preferably provided around the circumference of the inner cover, so as to facilitate the removal of the inner cover sealing plate from the inner cover by breaking the structure at the groove.
[0049] The inner cover operating part 4-4 is fixedly connected to the inner cover sealing piece 4-3. The inner cover operating part provides a structure that facilitates force application. Preferably, the inner cover sealing piece can be easily torn off the inner cover by pulling the inner cover operating part, thereby exposing the flushing port. The inner cover operating part is preferably formed in a ring shape, with a through hole in the middle of the ring opposite to the inner cover sealing piece. The ring shape facilitates force application when tearing. In addition, when infusion is required, the needle can be easily passed through the through hole in the middle to pierce the inner cover sealing piece.
[0050] Furthermore, the edge of the rinsing opening is preferably funnel-shaped, wider at the bottom and narrower at the top. That is, the lower end (closer to the bottle) of the rinsing opening is relatively larger, while the upper end (away from the bottle) is relatively smaller, with the diameter of the rinsing opening gradually decreasing from bottom to top. This allows for a higher flow rate and kinetic energy compared to other shaped rinsing openings when the rinsing solution flows out. Simultaneously, the smaller opening size saves on the amount of medicine used. Furthermore, due to the smaller size of the rinsing opening, the size of the inner cap sealing plate 4-3 can also be smaller, thus ensuring better adhesion of the inner cap sealing plate 4 to the inner cap 4 and reducing the possibility of accidental breakage.
[0051] A groove with an upward opening is provided on the outer surface of the inner cover 4. This groove forms a ring around the outer surface of the inner cover, constituting a second positioning portion 4-1. Specifically, the second positioning portion 4-1 includes an inner sidewall 4-1-1, an outer sidewall 4-1-2, a bottom surface 4-1-3, and an outer sidewall end face 4-1-4. The inner sidewall 4-1-1 extends downward from the sidewall of the rinsing port, the bottom surface 4-1-3 extends outward from the bottom of the inner sidewall 4-1-1, and the outer sidewall 4-1-2 extends upward from the outer side of the bottom wall. The bottom of the outer sidewall 4-1-2 engages with the cylindrical portion of the inner cover. This forms a ring of second positioning portion 4-1 with depth in the vertical direction and width in the horizontal direction.
[0052] The second positioning part 4-1 of this structure can further reduce the diameter of the flushing port. On the other hand, the second positioning part can be used to form a positioning and seal with the second mating part 3-2 of the middle cover.
[0053] Preferably, the top surface of the inner cover plate is provided with an inner cover operation part 4-4, which operably covers the flushing port. The top surface of the inner cover plate is higher than the upper surface of the cylindrical inner cover body in the vertical direction, so that the inner cover operation part is not blocked by the cylindrical inner cover body when it is removed.
[0054] The preferred structure of the middle cover 3 cooperating with the outer cover 1 and the inner cover 4 in the following specific embodiment will be described.
[0055] like Figure 1 As shown, the first positioning part 1-4 of the outer cap is preferably formed as a groove on the inner side wall of the outer cap cylinder, and the first mating part 3-1 of the middle cap is preferably formed as a protrusion on the outer side wall of the middle cap cylinder. The groove opening is provided inward, and the protrusion is accommodated in the groove. The bottom end of the middle cap 3 has an outward elasticity, so the bottom of the groove contacts the high point of the protrusion, applying a resisting force towards the center of the bottle cap, thereby stabilizing and maintaining the position of the inner cap along the diameter direction of the bottle cap, and this resisting force can form a seal between the outer cap 1 and the middle cap 3 to reduce leakage. The side wall below the groove and the lower surface of the protrusion abut against each other under the elastic drive of the rubber stopper. This contact is a resisting force applied along the height direction of the bottle cap. This resisting force is used to maintain the position of the outer cap and the middle cap in the vertical direction and form a seal on this contact surface.
[0056] In the above structure, the abutting fit between the middle cover 3 and the inner cover 4 and the outer cover 1 serves both positioning and sealing functions. During assembly, the rubber stopper 2 is first placed into the outer cover, and then the middle cover is placed into the outer cover. At this time, the positioning of the middle cover and the outer cover is accurate and reliable. When assembling the combination of the middle cover and the outer cover with the inner cover, the accurate positioning of the middle cover and the outer cover can improve the assembly yield and assembly efficiency of the inner cover.
[0057] More preferably, in the groove of the first positioning part 1-4, the distance between the upper and lower groove walls is slightly greater than the distance between the upper and lower surfaces of the protrusion of the first mating part 3-1. That is, the protrusion is allowed to have slight movement in the vertical direction in the groove, thereby allowing the middle cover to move up and down within a predetermined range. Thus, when the height of the second positioning part 4-1 of the inner cover is within a certain error range, it can still form a stable and sealed abutment fit with the middle cover.
[0058] Furthermore, the upper or lower surface of the first mating part 3-1 can be formed as an inclined surface to allow for some vertical movement space after the upper or lower surface abuts against the groove sidewall of the first positioning part 1-4. This allows the inner cover 4 to engage with the middle cover 3 at different height differences over a large range.
[0059] Furthermore, the second mating part 3-2 is disposed below the first mating part 3-1, forming a stepped shape that matches the surface shape of the outer wall 4-1-2 and the outer wall end face 4-1-4 of the second positioning part 4-1. The stepped second mating part 3-2 has an outward protrusion on the surface opposite to the outer wall 4-1-2 of the second positioning part 4-1. This protrusion allows the second positioning part 4-1 and the second mating part 3-2 to abut against each other along the radial direction of the bottle cap within a large range, cooperating with the positioning of the first mating part and the first positioning part, allowing for a high tolerance for error in the radial direction.
[0060] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A bottle cap for a packaging container, characterized in that, include: The outer cover has a cylindrical outer cover body and an outer cover plate disposed on the outer cover body. The inner side of the outer cover body is provided with a first positioning part and internal teeth, and the outer cover plate is provided with an injection port. The inner cover is disposed inside the outer cover and includes a cylindrical inner cover body and an inner cover plate disposed on the inner cover body. The outer side of the inner cover body is provided with external teeth that mesh with and position the internal teeth. A second positioning part is provided on the outer surface of the inner cover. A rinsing port is provided on the inner cover plate. The middle cover includes a cylindrical middle cover body and a middle cover plate disposed on the middle cover body. The outer peripheral surface of the middle cover body is provided with a first mating part that engages with the first positioning part and a second mating part that engages with the second positioning part to form positioning and sealing. A rubber stopper is disposed between the outer cover and the middle cover, forming a flexible and sealing connection with the outer cover and the middle cover; When the outer cover and the inner cover are locked by the inner teeth and the outer teeth, the first positioning part and the first mating part abut against each other and form a positioning and sealing connection between the outer cover and the middle cover, and the second positioning part and the second mating part abut against each other and form a positioning and sealing connection between the middle cover and the inner cover. The second positioning part is located below the first positioning part; the second positioning part includes a positioning post extending from the outer peripheral surface of the inner cover, the positioning post having a top surface, an inner surface, and an outer surface; the second mating part includes a vertical contact surface extending downward on the peripheral surface of the middle cover and a horizontal contact surface extending at the top of the vertical contact surface; wherein the vertical contact surface abuts against the inner surface of the positioning post, and the horizontal contact surface abuts against the top surface of the positioning post; The second mating part has an outward protrusion on the surface opposite to the outer wall of the second positioning part; the upper part of the inner wall of the cylindrical inner cover gradually narrows from bottom to top to form a rinsing port that is wider at the bottom and narrower at the top.
2. The bottle cap for a packaging container according to claim 1, characterized in that, The first positioning part includes a groove formed on the inner wall of the outer cover cylinder, the groove opening inward; the first mating part includes a protrusion formed on the outer peripheral surface of the middle cover, the protrusion being accommodated in the groove and abutting against the groove to complete positioning and sealing connection.
3. A bottle cap for a packaging container according to claim 1, characterized in that, The groove width in the vertical direction is greater than the height of the protrusion in the vertical direction.
4. A bottle cap for a packaging container according to claim 1, characterized in that, The raised upper or lower surface forms an inclined plane.
5. A bottle cap for a packaging container according to claim 1, characterized in that, A protrusion is provided on the outer wall of the vertical contact surface.
6. A bottle cap for a packaging container according to claim 1, characterized in that, The second positioning part includes an inner sidewall, an outer sidewall, a bottom surface, and an outer sidewall end face; the inner sidewall extends downward from the sidewall of the rinsing port, the bottom surface extends outward from the bottom of the inner sidewall, and the outer sidewall extends upward from the outside of the bottom surface, and the bottom of the outer sidewall is at least partially engaged with the cylinder of the inner cover.
7. A bottle cap for a packaging container according to claim 1, characterized in that, The inner teeth and the outer teeth are positioned and engaged in a first region; the outer cover and the inner cover are fixedly connected to each other in a second region outside the first region; a detachable tear ring is provided on the outer side wall of the outer cover between the first region and the second region, the tear ring being operable to separate the first region and the second region of the outer cover to allow the first region to be operated independently.
8. A bottle cap for a packaging container according to claim 1, characterized in that, The top surface of the inner cover plate is provided with an inner cover operation part, which operably covers the flushing port. The top surface of the inner cover plate is higher than the upper surface of the cylindrical inner cover body in the vertical direction.