Anti-cracking seal structure between drop head and bottle cap in drop bottle

Abstract

The utility model discloses a kind of anti-cracking sealing structure between drip head and bottle cap in drip bottle, comprising: drip head and the bottle cap connected with drip head are sealed and fixed on bottle body, liquid outlet passage is provided in drip head, first sealing surface is provided on the outside wall of drip head, sealing element is provided in the inner top wall of bottle cap, when bottle cap is connected with drip head, sealing element on bottle cap and first sealing surface on drip head form sealing structure by compressive stress. The utility model has good sealing effect, and can also prevent drip head from cracking.

Description

Technical Field

[0001] This utility model relates to the field of pharmaceutical packaging, and in particular to a crack-resistant sealing structure between the dropper and the cap of a dropper bottle. Background Technology

[0002] In dropper bottles, a cap is needed to seal the dispensing channel in the dropper head to prevent leakage. Currently, the sealing structure between the cap and the dropper head on the market includes... Figure 1 As shown, an inner stopper 1 is provided on the bottle cap. The inner stopper 1 is inserted into the liquid outlet channel and seals the channel through an interference fit. When using the inner stopper 1 for sealing, there is a tensile stress from the inside out at the contact point between the liquid outlet channel and the inner stopper 1. Figure 2 As shown, the inner wall of the liquid outlet channel will increase its tension under compressive stress, while the outer wall of the drip head is a component that does not provide support. The tensile stress on the inner wall of the liquid outlet channel will not be offset. The tensile stress will stretch the inner wall of the liquid outlet channel, causing the molecular structure of the inner wall to be stretched and separated. This can easily cause plastic deformation of the liquid outlet channel, reducing the sealing effect. When the drip bottle contains oily liquid or liquid with low surface tension, the liquid will penetrate into the inner wall of the liquid outlet channel through the liquid outlet channel. After absorbing the liquid, the inner wall of the liquid outlet channel will undergo a swelling reaction, resulting in a decrease in strength and a decrease in elastic modulus. At this time, when the inner plug 1 is inserted into the liquid outlet channel, the inner wall of the liquid outlet channel, which has deteriorated due to the swelling reaction, is prone to cracking after being subjected to tensile stress. Utility Model Content

[0003] The purpose of this invention is to provide a crack-resistant sealing structure between the dropper head and the cap in a dropper bottle that can create a good seal between the dropper head and the cap while ensuring that the inner wall of the liquid outlet channel does not crack.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a crack-resistant sealing structure between the dropper head and the cap in a dropper bottle, comprising: a dropper head fixedly sealed on the bottle body and a cap connected to the dropper head, wherein a liquid outlet channel is provided in the dropper head, a first sealing surface is provided on the outer side wall of the dropper head, and a sealing element is provided in the inner top wall of the cap. When the cap is connected to the dropper head, a sealing structure is formed between the sealing element on the cap and the first sealing surface on the dropper head through compressive stress.

[0005] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, the sealing element is an annular groove with a second sealing surface, and the sealing structure between the first sealing surface and the second sealing surface is a surface sealing structure.

[0006] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, the longitudinal cross-sectional shape of both the first sealing surface and the second sealing surface is conical, and the taper of the first sealing surface and the second sealing surface is the same.

[0007] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, both the first sealing surface and the second sealing surface are arc-shaped surfaces, with the arc length of the first sealing surface being greater than that of the second sealing surface.

[0008] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, the sealing element is an annular groove with a sealing ring, and the sealing structure between the sealing ring and the first sealing surface is a line sealing structure.

[0009] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, the longitudinal section of the first sealing surface is either conical or cylindrical.

[0010] Furthermore, in the aforementioned anti-cracking sealing structure between the dropper head and the cap of the dropper bottle, a gap is left between the top wall of the dropper head and the bottom of the annular groove. The advantages of this invention are as follows: the sealing element on the bottle cap applies compressive stress to the first sealing surface of the drip head to form a sealing structure. The inner wall of the liquid outlet channel in the drip head is also subjected to compressive stress from the outside to the inside. The compressive stress acting on the inner wall of the liquid outlet channel causes the inner wall of the liquid outlet channel to be compressed and contracted. When the inner wall is compressed and contracted, the molecular structure of the inner wall is compressed and aggregated together. It is necessary to use a greater force to destroy the integrity of the molecular structure. When oily liquid or liquid with low surface tension penetrates into the drip head through the liquid outlet channel, the inner wall of the liquid outlet channel will not crack under compressive stress, thereby ensuring the integrity of the drip head.

[0011] When the seal is an annular groove with a second sealing surface, the second sealing surface and the first sealing surface form a wedge-shaped sealing structure, and the wedge-shaped structure itself will generate a good self-sealing effect, so that the bottle cap can achieve a good sealing effect on the drip head; when the seal is an annular groove with a sealing ring, the sealing ring and the first sealing surface form a line sealing structure, and the two can generate a large sealing force, improving the sealing effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the sealing structure between the dropper and the cap in a traditional dropper bottle.

[0013] Figure 2 yes Figure 1 A schematic diagram of the force analysis of the liquid outlet channel.

[0014] Figure 3This is a schematic diagram of an embodiment of the anti-cracking sealing structure between the dropper head and the cap in the dropper bottle described in this utility model.

[0015] Figure 4 yes Figure 3 A schematic diagram of the force analysis of the liquid outlet channel.

[0016] Figure 5 yes Figure 3 A schematic diagram of the structure of the dropper head.

[0017] Figure 6 yes Figure 3 A schematic diagram of the bottle cap structure.

[0018] Figure 7 This is a schematic diagram of Embodiment 2 of the anti-cracking sealing structure between the dropper head and the cap in the dropper bottle described in this utility model.

[0019] Figure 8 yes Figure 7 A schematic diagram of the bottle cap structure.

[0020] Figure 9 yes Figure 7 A schematic diagram of the structure of the dropper head. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments. Example 1:

[0022] like Figures 3-6 As shown, the anti-cracking sealing structure between the dropper head and the cap in the dropper bottle of this utility model includes: a dropper head 2 sealed and fixed on the bottle body and a cap 3 connected to the dropper head 2. A liquid outlet channel 21 is provided in the dropper head 2. A first sealing surface 23 is provided on the outer side wall 22 of the dropper head 2. A sealing element is provided in the inner top wall of the cap 3. When the cap is connected to the dropper head, the sealing element on the cap 3 and the first sealing surface 23 on the dropper head 2 form a sealing structure through compressive stress.

[0023] When the seal and the first sealing surface 23 on the drip head 2 form a sealing structure, the inner wall of the liquid outlet channel 21 in the drip head 2 is also subjected to compressive stress from the outside to the inside. The compressive stress on the inner wall of the liquid outlet channel 21 causes the inner wall of the liquid outlet channel 21 to be compressed and contracted. When the inner wall is compressed and contracted, the molecular structure in the inner wall is compressed and aggregated together. It is necessary to use a greater force to destroy the integrity of the molecular structure. The deformation of the drip head 2 is elastic deformation. When the seal no longer abuts against the drip head 2, the drip head 2 can return to its original shape without affecting the sealing effect. When oily liquid or liquid with low surface tension penetrates into the drip head 2 through the liquid outlet channel 21, the inner wall of the liquid outlet channel 21 will not crack under compressive stress, thus ensuring the integrity of the drip head 2.

[0024] In this embodiment, the sealing element is an annular groove 31 with a second sealing surface 311. The sealing structure between the first sealing surface 23 and the second sealing surface 311 is a surface sealing structure. The longitudinal sections of the first sealing surface 23 and the second sealing surface 311 are both conical, and the tapers of the first sealing surface 23 and the second sealing surface 311 are the same. When the second sealing surface 311 on the annular groove 31 is attached to the first sealing surface 23 of the drip head 2, the second sealing surface 311 applies compressive stress to the first sealing surface 23 and forms a wedge-shaped sealing structure. The wedge-shaped sealing structure can form a good self-sealing effect, so that the bottle cap 3 can achieve a good sealing effect on the drip head 2.

[0025] When the second sealing surface 311 and the first sealing surface 23 form a seal, an air seal is formed in the liquid outlet channel 21, preventing the liquid medicine in the bottle from entering the liquid outlet channel 21. When the bottle is pressurized, the pressure in the liquid outlet channel 21 increases, pressurizing the liquid outlet channel 21. The pressure increases to the drip head 2, causing the first sealing surface 23 on the drip head 2 to form a self-tight seal with the second sealing surface 311 of the annular groove 31, improving the air seal effect and effectively preventing the liquid medicine from flowing out of the liquid outlet channel 21.

[0026] In this embodiment, a gap is left between the top wall 24 of the drip head 2 and the bottom 312 of the annular groove 31. When dripping, the medicine is suspended in the outlet channel 21 and gathered into a drop before dripping out. The medicine will not spread to the top wall 24 of the drip head 2. After the dripping is completed, the residual medicine in the outlet channel 21 will be absorbed into the bottle, so there will be no residual liquid spreading to the top wall 24 of the drip head 2. When the bottle cap 3 is closed on the drip head 2, no medicine will affect the bottle cap 3.

[0027] In this embodiment, both the first sealing surface 23 and the second sealing surface 311 are arc-shaped surfaces, with the arc length of the first sealing surface 23 being greater than that of the second sealing surface 311. Compared to the traditional straight-surface wedge seal, the arc-shaped wedge seal structure has a larger contact area, enabling more even pressure distribution and thus improving the sealing durability between the first sealing surface 23 and the second sealing surface 311. The fact that the arc length of the first sealing surface 23 is greater than that of the second sealing surface 311 ensures that the second sealing surface 311 is completely fitted onto the first sealing surface 23. Example 2:

[0028] like Figures 7-9 As shown, in this embodiment, the sealing element is an annular groove 31 with a sealing ring 313. The sealing structure between the sealing ring 313 and the first sealing surface 23 is a line seal structure. The longitudinal section of the first sealing surface 23 can be either conical or cylindrical; in this embodiment, a cylindrical shape is preferred. When the bottle cap 3 is connected to the drip head 2, the sealing ring 313 seals against the first sealing surface 23, applying compressive stress to the first sealing surface 23. The line seal structure between the sealing ring 313 and the first sealing surface 23 can generate a large sealing force, improving the sealing effect. In this embodiment, a gap is also left between the top wall 24 of the drip head 2 and the bottom 312 of the annular groove 31.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A crack-resistant sealing structure between the dropper and the cap in a dropping bottle, including: A drip head and a bottle cap that are sealed and fixed on a bottle body, wherein a liquid outlet channel is provided in the drip head, characterized in that: a first sealing surface is provided on the outer side wall of the drip head, and a sealing element is provided in the inner top wall of the bottle cap; when the bottle cap is connected to the drip head, a sealing structure is formed between the sealing element on the bottle cap and the first sealing surface on the drip head through compressive stress.

2. The anti-cracking sealing structure between the dropper head and the cap in the dropper bottle according to claim 1, characterized in that: The sealing element is an annular groove with a second sealing surface, and the sealing structure between the first sealing surface and the second sealing surface is a surface sealing structure.

3. The anti-cracking sealing structure between the dropper head and the cap in the dropper bottle according to claim 2, characterized in that: The longitudinal cross-sectional shape of both the first sealing surface and the second sealing surface is conical, and the taper of the first sealing surface and the second sealing surface is the same.

4. The anti-cracking sealing structure between the dropper head and the cap in the dropper bottle according to claim 3, characterized in that: Both the first sealing surface and the second sealing surface are arc-shaped surfaces, with the arc length of the first sealing surface being greater than that of the second sealing surface.

5. The anti-cracking sealing structure between the dropper head and the cap in the dropper bottle according to claim 1, characterized in that: The sealing element is an annular groove with a sealing ring, and the sealing structure between the sealing ring and the first sealing surface is a line sealing structure.

6. The anti-cracking sealing structure between the dropper head and the cap in the dropper bottle according to claim 5, characterized in that: The longitudinal section of the first sealing surface can be either conical or cylindrical.

7. The anti-cracking sealing structure between the dropper head and the cap in a dropper bottle according to claim 2 or 5, characterized in that: A gap is left between the top wall of the drip head and the bottom of the annular groove.

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