Moisture-proof medical polypropylene bottle cap

Abstract

The utility model relates to the technical field of polypropylene containers, in particular to a moisture-proof medical polypropylene bottle cap which comprises a cap body and a sealing assembly arranged in the cap body, a first internal thread is arranged on the upper portion of the inner wall of the cap body, a second internal thread is arranged on the inner wall of the cap body below the first internal thread, and the sealing assembly is arranged in the cap body. The thread direction of the second internal thread is opposite to that of the first internal thread; the sealing assembly is installed at the top of the inner side of the cap body through a first internal thread in a threaded mode and comprises a movable block, the bottom of the movable block is sleeved with a sealing ring, the sealing ring is used for sealing the joint of the bottle body and the movable block, and an installation groove is formed in the top of the movable block; an elastic piece is mounted on the upper end face of the movable block through a mounting groove in a gluing mode. The bottle cap has the advantage of stabilizing the thread meshing tightness, and solves the problems that due to deviation of the thread matching size of an existing polypropylene bottle cap, the sealing performance fails, and medicine is affected with damp.

Description

TECHNICAL FIELD

[0001] The utility model relates to polypropylene container technology field, concretely is a kind of moisture-proof medicinal polypropylene bottle cap. BACKGROUND

[0002] As an important part of drug packaging, the design and material selection of bottle cap are crucial to protect drugs from external pollution. Polypropylene, as a common thermoplastic, has been widely used in drug packaging materials due to its good mechanical strength, chemical corrosion resistance, high thermal stability and waterproof sealing performance.

[0003] During long-term storage of drugs, the bottle cap and bottle body screw thread components made of polypropylene material may expand or contract due to temperature fluctuations, and the linear expansion coefficient may cause the size deviation of the screw thread structure to change with temperature, resulting in periodic changes in the tightness of the meshing tooth surface. At the same time, the stress relaxation characteristics of the material itself may gradually release the pre-tightening stress generated during initial tightening, which may also cause the screw thread clearance to gradually expand. The superposition of the two effects will eventually result in a mechanical fastening force of the screw connection that is lower than the design threshold, forming a potential risk of sealing failure.

[0004] Therefore, a moisture-proof medicinal polypropylene bottle cap is proposed to solve the above problems. SUMMARY

[0005] The utility model aims at providing a moisture-proof medicinal polypropylene bottle cap, which has the advantage of stable screw thread engagement tightness, and solves the problem of sealing failure and moisture absorption of drugs caused by size deviation of the screw thread fit of the existing polypropylene bottle cap.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a moisture-proof medicinal polypropylene bottle cap, comprising a cap body and a sealing assembly arranged inside the cap body, a first internal thread is arranged on the upper inner wall of the cap body, a second internal thread is arranged on the inner wall of the cap body below the first internal thread, and the screw thread direction of the second internal thread is opposite to that of the first internal thread; the sealing assembly is screw-mounted on the inside top of the cap body through the first internal thread.

[0007] Preferably, the bottle body is screw-mounted in the cap body through the second internal thread, and an external thread matching the second internal thread is arranged on the top outer wall of the bottle body.

[0008] In the design, the bottle body is screw-mounted in the cap body through the second internal thread, and an external thread matching the second internal thread is arranged on the top outer wall of the bottle body, which realizes stable screw connection between the cap body and the bottle body, thereby facilitating installation and disassembly of the two.

[0009] Preferably, the sealing assembly comprises a movable block, the bottom of the movable block is sleeved with a sealing ring, the sealing ring is used for sealing the joint between the bottle body and the movable block, and the top of the movable block is provided with a mounting groove.

[0010] In the design, the bottom of the movable block of the sealing assembly is sleeved with a sealing ring for sealing the joint between the bottle body and the movable block, so that the sealing of the joint between the bottle body and the movable block is realized, and the moisture and the like is effectively prevented from entering from the joint.

[0011] Preferably, the outer side of the movable block is provided with external threads matched with the first internal threads, and an elastic member is glued and mounted on the upper end face of the movable block through the mounting groove.

[0012] In the design, the outer side of the movable block is provided with external threads matched with the first internal threads, and an elastic member is glued and mounted on the upper end face of the movable block through the mounting groove, so that the threaded connection and installation of the sealing assembly and the cover body are realized, and the elastic member can provide elastic force to cope with a certain degree of deformation problem.

[0013] Preferably, the elastic member adopts an inflatable rubber airbag structure design, and the upper end face of the elastic member is in dynamic contact with the top of the inner wall of the cover body.

[0014] In the design, the elastic member adopts an inflatable rubber airbag structure design, and the upper end face of the elastic member is in dynamic contact with the top of the inner wall of the cover body, so that the elastic deformation of the elastic member is continuously used to provide pressure, and the adverse effects caused by temperature fluctuations or stress relaxation are compensated, so that the tightness of the threaded engagement is stabilized.

[0015] Preferably, the sealing ring adopts a soft silica gel material design, and the upper and lower ends of the sealing ring are both provided with anti-skid edges distributed in a radial manner.

[0016] The bottom of the movable block is provided with a groove matched with the anti-skid edges.

[0017] In the design, the sealing ring adopts a soft silica gel material design, and the upper and lower ends of the sealing ring are both provided with anti-skid edges distributed in a radial manner, and the bottom of the movable block is provided with a matched groove, so that the stable installation of the sealing ring and the movable block is realized, the anti-skid edges increase the friction force and prevent displacement between the sealing ring and the movable block, and the anti-skid edges can also improve the friction force of the contact surface between the bottle body and the sealing ring.

[0018] Preferably, the outer diameter size of the top of the bottle body is smaller than the outer diameter size of the sealing ring.

[0019] In the design, the outer diameter size of the top of the bottle body is smaller than the outer diameter size of the sealing ring, so that the sealing ring can better cover the top of the bottle body, a reliable sealing area is formed, and the moisture is effectively prevented from entering from the joint between the top of the bottle body and the sealing ring.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0021] The utility model discloses a first inner thread and second inner thread with opposite screw directions are arranged, when the bottle body is screwed into the cover body, the rotation of the bottle body drives the sealing assembly to rotate reversely along the first inner thread through the second inner thread, under the static friction effect of the contact between the top of the bottle body and the sealing ring, the reverse relative motion tendency is formed in the cover body, and the sealing ring and the bottle body contact surface are pressed to be more closely matched.

[0022] The structure utilizes the linkage characteristics of opposite screw directions, when the thread matching size changes due to temperature fluctuation or material stress relaxation, the meshing gap is automatically compensated through dynamic relative motion, the effect of stabilizing the thread meshing tightness, improving the sealing reliability and preventing the medicine from being damp is reached. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the front view structural schematic diagram of the utility model;

[0024] Figure 2 It is the cross section structural schematic diagram of the utility model;

[0025] Figure 3 It is the Figure 2 Partial enlarged structure schematic diagram of the utility model;

[0026] Figure 4 It is the sealing assembly explosion structure schematic diagram of the utility model.

[0027] In the drawing: 1, cover body; 11, first inner thread; 12, second inner thread; 2, bottle body; 3, sealing assembly; 31, movable block; 311, installation groove; 32, elastic part; 33, sealing ring; 331, anti-skid rib. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.

[0029] Embodiment one

[0030] As Figure 1 , Figure 2 , Figure 3 And Figure 4As shown, the utility model provides an embodiment: a kind of moisture-proof medicinal polypropylene bottle cap, including cover body 1 and the sealing assembly 3 being equipped in cover body 1, first inner thread 11 is equipped in cover body 1 inner wall top, second inner thread 12 is equipped in the inner wall of cover body 1 below first inner thread 11, and the thread direction of second inner thread 12 is opposite to first inner thread 11;Sealing assembly 3 is screw-mounted in the inside top of cover body 1 by first inner thread 11.

[0031] Specifically, by setting the first inner thread 11 and the second inner thread 12 with opposite thread directions, when the bottle body 2 is screwed into the cover body 1, the rotation of the bottle body 2 drives the sealing assembly 3 to rotate in the opposite direction along the first inner thread 11. Under the action of static friction generated by the contact between the top of the bottle body 2 and the sealing ring 33, the two form a trend of opposite relative motion in the cover body 1, which promotes the sealing ring 33 to be more tightly attached to the contact surface of the bottle body 2 due to extrusion.

[0032] This structure utilizes the linkage characteristics of opposite thread directions. When the thread fit size changes due to temperature fluctuations or material stress relaxation, the meshing gap is automatically compensated through dynamic relative motion, achieving the effects of stabilizing the tightness of thread engagement, improving sealing reliability, and preventing moisture from affecting the medicine.

[0033] Embodiment two

[0034] To achieve stable thread connection between the cover body and the bottle body and facilitate installation and removal, as shown in Figure 1 , Figure 2 and Figure 3 in this embodiment, the bottle body 2 is screw-mounted in the cover body 1 through the second inner thread 12, and the outer wall top of the bottle body 2 is provided with an outer thread matching the second inner thread 12.

[0035] Specifically, the bottle body 2 is screw-mounted in the cover body 1 through the second inner thread 12, and the outer wall top of the bottle body 2 is provided with a matching outer thread, achieving stable thread connection between the cover body 1 and the bottle body 2, thereby facilitating installation and removal of the two.

[0036] Further, the sealing assembly 3 includes a movable block 31, the movable block 31 is provided with a sealing ring 33 at the bottom, the sealing ring 33 is used to seal the connection between the bottle body 2 and the movable block 31, and the movable block 31 is provided with a mounting groove 311 at the top.

[0037] Specifically, the sealing assembly 3 is provided with a sealing ring 33 at the bottom of the movable block 31 to seal the connection between the bottle body 2 and the movable block 31, effectively preventing moisture and the like from entering from this place.

[0038] Further, the movable block 31 is provided with an outer thread matching the first inner thread 11 on the outside, and an elastic member 32 is glued and mounted on the upper end face of the movable block 31 through the mounting groove 311.

[0039] Specifically, the outer side of the movable block 31 is provided with external threads matched with the first internal threads 11, and the upper end face is glued and mounted with the elastic member 32 through the mounting groove 311, realizing the threaded connection and installation of the sealing assembly 3 and the cover body 1, and the elastic member 32 can provide elastic force to cope with a certain degree of deformation problem.

[0040] Embodiment three

[0041] In order to realize the threaded connection and installation of the sealing assembly and the cover body and cope with a certain degree of deformation problem, as shown in Figure 2 Figure 3 and Figure 4 , in the embodiment, the elastic member 32 adopts the structure design of the inflated rubber air bag, and the upper end face of the elastic member 32 is in dynamic contact with the top of the inner wall of the cover body 1.

[0042] Specifically, the elastic member 32 adopts the structure design of the inflated rubber air bag and the upper end face is in dynamic contact with the top of the inner wall of the cover body 1, realizing that the elastic deformation of the elastic member 32 continuously provides pressure, compensates for the adverse effects caused by temperature fluctuations or stress relaxation, and stabilizes the tightness of the threaded engagement.

[0043] Further, the sealing ring 33 is designed with soft silica gel material, and the upper and lower ends of the sealing ring 33 are both provided with anti-skid edges 331 distributed in a radial manner.

[0044] The bottom of the movable block 31 is provided with a groove matched with the anti-skid edges 331.

[0045] Specifically, the sealing ring 33 is designed with soft silica gel material and the upper and lower ends are provided with anti-skid edges 331 distributed in a radial manner, and the bottom of the movable block 31 is provided with a matched groove, realizing the stable installation of the sealing ring 33 and the movable block 31, the anti-skid edges 331 increase the friction force and prevent displacement between the sealing ring 33 and the movable block 31, and at the same time, the anti-skid edges 331 can also improve the friction force of the contact surface between the bottle body 2 and the sealing ring 33.

[0046] Further, the outer diameter dimension of the top of the bottle body 2 is smaller than the outer diameter dimension of the sealing ring 33.

[0047] Specifically, the outer diameter dimension of the top of the bottle body 2 is smaller than the outer diameter dimension of the sealing ring 33, realizing that the sealing ring 33 can better cover the top of the bottle body 2, forming a reliable sealing area, and effectively blocking the moisture from entering from the connection between the top of the bottle body 2 and the sealing ring 33.

[0048] When the utility model is used, the movable block 31 of the sealing assembly 3 is aligned with the top of the inner side of the cover body 1, first rotated along the second internal threads 12, and then rotated along the first internal threads 11, until the movable block 31 is completely rotated into the cover body 1.

[0049] ​The top of the bottle body 2 is aligned with the bottom opening of the cap 1, and the external thread on the top of the bottle body 2 is aligned with the second internal thread 12 of the cap 1.

[0050] The cap 1 is rotated clockwise, and the cap 1 is mounted on the top of the bottle body 2 through the second internal thread 12. During the operation, because the first internal thread 11 and the second internal thread 12 are in opposite directions, as the bottle body 2 is continuously screwed in, the top of the bottle body 2 is in contact with the sealing ring 33, and the relative movement generates a static friction force, which causes the sealing ring 33 to be pressed and tightly fit on the end face and a small part of the side wall of the top of the bottle body 2, and further enhances the sealing effect.

[0051] Finally, the external thread of the bottle body 2 is completely engaged with the second internal thread 12, the sealing ring 33 tightly covers the top of the bottle body 2, and a moisture-proof sealing area is formed.

[0052] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A moisture-proof pharmaceutical polypropylene bottle cap, comprising a cap body (1) and a sealing assembly (3) disposed within the cap body (1), characterized in that: The cover (1) has a first internal thread (11) on the upper part of its inner wall, and a second internal thread (12) is provided on the inner wall of the cover (1) below the first internal thread (11). The second internal thread (12) has the opposite thread direction to the first internal thread (11). The sealing assembly (3) is threaded onto the top of the inner side of the cover (1) via the first internal thread (11).

2. The moisture-proof pharmaceutical polypropylene bottle cap according to claim 1, characterized in that, The bottle body (2) is installed inside the cap (1) by a second internal thread (12), and the top of the outer wall of the bottle body (2) is provided with an external thread that matches the second internal thread (12).

3. The moisture-proof pharmaceutical polypropylene bottle cap according to claim 1, characterized in that, The sealing assembly (3) includes a movable block (31), a sealing ring (33) is fitted at the bottom of the movable block (31), the sealing ring (33) is used to seal the connection between the bottle body (2) and the movable block (31), and the top of the movable block (31) is provided with an installation groove (311).

4. The moisture-proof pharmaceutical polypropylene bottle cap according to claim 3, characterized in that, The movable block (31) has an external thread that matches the first internal thread (11) on its outer side, and an elastic element (32) is glued to the upper end face of the movable block (31) through the mounting groove (311).

5. A moisture-proof pharmaceutical polypropylene bottle cap according to claim 4, characterized in that, The elastic element (32) adopts an inflatable rubber airbag structure design, and the upper end face of the elastic element (32) is in dynamic contact with the top of the inner wall of the cover (1).

6. The moisture-proof pharmaceutical polypropylene bottle cap according to claim 3, characterized in that, The sealing ring (33) is made of soft silicone material, and anti-slip ridges (331) are provided at both the upper and lower ends of the sealing ring (33) in a radial pattern. The bottom of the movable block (31) has a groove that matches the anti-slip edge (331).

7. A moisture-proof pharmaceutical polypropylene bottle cap according to claim 2, characterized in that, The outer diameter of the top of the bottle body (2) is smaller than the outer diameter of the sealing ring (33).

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