A bottle cap for a liquid bottle

Abstract

This invention provides a bottle cap for a liquid bottle, belonging to the field of liquid container technology. It solves the problems of insufficient stability in the use of existing bottle caps. The bottle cap includes a cap body and a stopper fixed within the cap body. The cap body has an air hole and a drip hole. The stopper is made of an elastic material and includes a cylindrical straight-insertion end and a normally closed liquid outlet end. The cap body has a cylindrical air-guiding wall. The straight-insertion end fits against the air-guiding wall. When the air pressure inside the straight-insertion end is greater than the external air pressure, the straight-insertion end seals against the air-guiding wall, and the liquid outlet end deforms and opens, allowing the inner cavity of the straight-insertion end to communicate with the drip hole. When the air pressure inside the straight-insertion end is less than the external air pressure, the straight-insertion end contracts, allowing the inner cavity of the straight-insertion end to communicate with the air hole. Using this bottle cap in a liquid bottle ensures smooth liquid dripping and bottle repositioning, improving the stability of the bottle cap. Furthermore, the stopper and cap bodies have simple structures and are easy to manufacture.

Description

Technical Field

[0001] This invention belongs to the field of liquid container technology and relates to a bottle cap for a liquid bottle. Background Technology

[0002] Liquid bottles used to store eye drops are called eye drop bottles. They are widely used because of their portability and ease of use. When using them, the eye drops are usually squeezed out by squeezing the bottle.

[0003] To prevent contamination of the liquid medicine in the bottle during use, technicians have designed contamination-proof eye drop bottles. For example, an eye drop bottle disclosed in Chinese patent literature [Publication No.: CN 114366657A] includes a squeeze-deformable storage bottle and an inner cap connected to the upper end of the storage bottle, forming a cavity with it. The upper end of the inner cap has a liquid outlet hole communicating with the cavity. An elastic body is located inside the inner cap, with a sealing part at the upper end of the elastic body. An air inlet hole communicating with the cavity is located on the inner cap, and an air filter and a one-way air intake device are provided between the air inlet hole and the cavity. The elastomer includes an upper end, a lower end, and several elastic spirals connecting the upper and lower ends. A sealing part is located on the upper end. An air inlet is located on the side wall of the inner cap, and the inner cap below the air inlet is inserted into the liquid storage bottle. The air filtration device includes an air storage chamber located inside the inner cap and connected to the air inlet. A one-way air intake device is located between the air storage chamber and the cavity. The one-way air intake device includes an elastic sheet, which is inserted between the inner cap and the liquid storage bottle. The inner side of the elastic sheet is attached to the inner cap, and there is a gap between the outer side of the elastic sheet and the liquid storage bottle.

[0004] When using the aforementioned eye drop bottle, although the literature describes that squeezing the bottle body to dispense the liquid causes the liquid in the cavity to compress the elastomer and move the sealing part downward to open the dispensing hole, the liquid in the cavity not only contacts the inclined outer surface of the upper end but also the lower surface and inclined inner surface of the upper end, exerting an upward thrust on the upper end. This makes it difficult for the upper end to move downward to open the dispensing hole for dispensing. When releasing the bottle body to reset, although the literature describes that air in the air reservoir can enter the cavity after pushing aside the elastic plate, when the air pushes aside the elastic plate, while opening the channel between the inner cap and the inner surface of the elastic plate, it also easily causes the outer surface of the elastic plate to press against the bottle, closing the channel between the elastic plate and the bottle. This prevents air from entering the bottle and resetting it. Therefore, in the aforementioned eye drop bottle, the cap composed of the elastomer and the inner cap is not only structurally complex, especially the elastomer, which is difficult to manufacture, but also has poor stability, easily leading to situations where the eye drop bottle cannot dispense liquid and the bottle body cannot reset. To improve stability and facilitate the smooth repositioning of the dripping and storage bottle bodies, a structure is usually provided at the upper end of the elastomer to withstand more downward pressure during dripping, and an air groove structure is provided on the outer surface of the elastic sheet for ventilation. However, these structural modifications make the structure of the elastomer more complex and more difficult to manufacture. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a bottle cap for liquid bottles, which solves the technical problem of insufficient stability in the use of existing bottle caps.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A cap for a liquid bottle includes a cap body and a stopper fixed in the cap body. The cap body has an air hole and a drip hole. The stopper is made of an elastic material. The stopper includes a cylindrical insertion end and a normally closed liquid outlet end. The cap body has a cylindrical air guide wall. The insertion end fits against the air guide wall. When the air pressure inside the insertion end is greater than the external air pressure, the insertion end and the air guide wall seal, and the liquid outlet end deforms and opens, allowing the inner cavity of the insertion end to communicate with the drip hole. When the air pressure inside the insertion end is less than the external air pressure, the insertion end contracts, allowing the inner cavity of the insertion end to communicate with the air hole.

[0008] The liquid bottle consists of a bottle body and a cap. The bottle body contains liquid, and the cap is fixedly connected to the bottle mouth. The inner cavity of the straight-insertion end of the stopper is connected to the inner cavity of the bottle body. During normal storage, the air pressure inside the bottle (i.e., the air pressure in the inner cavity of the straight-insertion end) is equal to the external air pressure. The liquid outlet end of the stopper is normally closed, the inner cavity of the straight-insertion end is not connected to the drip hole, and the straight-insertion end remains in contact with the gas guide wall.

[0009] When liquid needs to be dispensed, invert or tilt the liquid bottle downwards and squeeze the bottle to increase the air pressure inside (i.e., the air pressure inside the straight-insertion end is greater than the external air pressure). At this time, the straight-insertion end and the air guide wall are sealed, effectively preventing liquid from flowing out between the air guide wall and the straight-insertion end. At the same time, the dispensing end deforms and opens, allowing the inner cavity of the straight-insertion end to communicate with the drip hole. The liquid flows out from the drip hole after passing through the inner cavity of the straight-insertion end, thus dispensing. After dispensing, release the bottle, creating a negative pressure inside the bottle (i.e., the air pressure inside the straight-insertion end is less than the external air pressure). The dispensing end returns to its original position and closes again. At the same time, the straight-insertion end contracts, opening the inner cavity of the straight-insertion end to communicate with the air vent. Outside air enters the cap through the air vent and enters the bottle through the vent gap between the straight-insertion end and the air guide wall. When the bottle returns to its original position, the air pressure inside and outside the bottle is balanced (i.e., the air pressure inside the straight-insertion end is equal to the external air pressure), and the straight-insertion end re-fits the air vent wall.

[0010] When dispensing (i.e., when the air pressure inside the straight-insertion end is greater than the external air pressure), because the straight-insertion end is sealed to the vent wall, the liquid in the bottle can only enter the inner cavity of the straight-insertion end, applying pressure to the outlet end in one direction without contacting the outer surface of the stopper. This ensures that when the bottle is squeezed, the outlet end is only subjected to pressure along the direction from the straight-insertion end to the outlet end, causing it to deform and open, thus connecting the inner cavity of the straight-insertion end with the dispensing hole. This avoids the situation in the prior art where the outlet hole cannot be opened for dispensing due to the force on both sides of the elastic body, ensuring that the bottle cap can dispense smoothly during use and improving the stability of the bottle cap when dispensing liquid. Because the straight insertion end is located at the end of the stopper and is cylindrical, while the vent wall is cylindrical, the straight insertion end of the stopper can freely contract and deform. Moreover, the inner cavity of the straight insertion end is a hollow structure for liquid dispensing. After the straight insertion end contracts and deforms, it will not form other structures that obstruct airflow in its inner cavity. Therefore, when the bottle is reset (i.e., when the air pressure in the inner cavity of the straight insertion end is less than the external air pressure), the contraction and deformation of the straight insertion end allows the inner cavity of the straight insertion end to communicate with the vent, thus enabling airflow. This ensures that external air can smoothly enter the bottle and allow the bottle to be reset smoothly, improving the stability of the bottle cap when the liquid bottle is reset.

[0011] Therefore, using this cap on liquid bottles ensures smooth dripping and bottle repositioning, improving the stability of the cap's use. Furthermore, the stopper and cap have a simple structure and are easy to manufacture.

[0012] In the cap of the liquid bottle described above, the inner side of the port of the straight insertion end has a tapered flared surface.

[0013] During dispensing, the flared end allows liquid to smoothly enter the inner cavity of the straight-ended end, enabling the outlet to open smoothly under unidirectional pressure for dispensing. Furthermore, the radial pressure on the flared end ensures the straight-ended end adheres tightly to the air guide wall, preventing liquid leakage. Simultaneously, during bottle repositioning, the flared end reduces the thickness at the straight-ended end port, decreasing elastic resistance and allowing outside air to enter smoothly for repositioning. Therefore, the flared end also improves the stability of the bottle cap.

[0014] In the cap of the liquid bottle described above, the air guide wall includes an air passage section and a sealing section. The air passage section is close to the air hole and its diameter is larger than that of the sealing section. There is an air passage annular gap between the straight insertion end and the air passage section, and the straight insertion end is in contact with the sealing section.

[0015] After dividing the air guide wall into an air passage section and a sealing section, on the one hand, the sealing section and the straight insertion end can prevent liquid from flowing out between the air guide wall and the straight insertion end during dripping. On the other hand, the air passage gap between the air passage section and the straight insertion section can allow air to smoothly exert pressure on the straight insertion end to generate contraction and deformation when the bottle body is reset, so that the straight insertion end can smoothly contract and deform to connect the air hole and the inner cavity of the straight insertion end, so that the bottle body can be reset smoothly and the stability of the bottle cap can be improved.

[0016] In the cap of the liquid bottle described above, an assembly ring is provided on the outer side of the stopper body between the insertion end and the liquid outlet end. The outer edge of the assembly ring is fixed to the cap body, and an air inlet filter membrane is provided on the assembly ring between the air hole and the air guide wall.

[0017] After the dripping is complete, the bottle is released to create negative pressure inside. Outside air enters the cap through the vent, passes through the air inlet filter membrane for bacterial filtration, and then reaches the air guide wall. This air acts on the straight-insertion end, causing it to contract and deform smoothly, connecting the vent and the inner cavity of the straight-insertion end, thus achieving air intake and repositioning of the bottle. The assembly ring ensures the stopper is stably fixed to the cap, guaranteeing stable use of the cap. It also facilitates the installation of the air inlet filter membrane and ensures a simple stopper structure and ease of manufacturing. The air inlet filter membrane on the assembly ring not only allows outside air to smoothly enter the bottle for repositioning and ensures cap stability, but also filters and blocks bacteria from the outside air, achieving the cap's antibacterial function.

[0018] In the cap of the liquid bottle described above, the cap body has an annular plate-shaped partition, and a cylindrical insert is integrally provided along the inner edge of the partition. The air guide wall is provided on the inner side of the insert.

[0019] The structure of the separator and insert stabilizes the air guide wall, thereby improving the stability of the bottle cap.

[0020] In the cap of the liquid bottle described above, the cap body has a protective sleeve surrounding the outside of the liquid outlet end, the air hole is located outside the protective sleeve, the protective sleeve and the insert are arranged opposite to each other, and the inner edge of the assembly ring is fixed between the protective sleeve and the insert.

[0021] The protective sleeve serves to limit and protect the dispensing end of the stopper. During dispensing, as the pressure inside the bottle increases due to compression, the protective sleeve radially limits the dispensing end, preventing excessive radial deformation that could lead to loss of elasticity and reset. During bottle reset, the protective sleeve isolates the dispensing end from the vent, preventing external air from acting on it and causing deformation. Furthermore, the protective sleeve and insert also clamp the inner edge of the fixing ring, ensuring the stopper is stably fixed within the cap. Therefore, the protective sleeve improves the stability of the bottle cap during use.

[0022] In the cap of the liquid bottle mentioned above, a venting groove is provided on the end face of the insert facing the protective cylinder, and the two ends of the venting groove penetrate the insert radially.

[0023] The venting groove is used to connect the inner and outer spaces of the insert, so that outside air can smoothly enter the venting ring gap through the venting groove when the bottle is reset and act on the straight insert end. This allows the straight insert end to contract and deform smoothly, connecting the air hole and the inner cavity of the straight insert end, ensuring the smooth reset of the bottle and improving the stability of the bottle cap.

[0024] In the cap of the liquid bottle mentioned above, a spherical elastic sealing membrane is provided on the liquid outlet end, protruding along the direction from the straight insertion end to the liquid outlet end. The elastic sealing membrane is provided with an opening slit to form several elastic sealing flaps that abut against each other and seal.

[0025] When the bottle is squeezed to dispense liquid, the elastic sealing flap deforms and opens under pressure along the direction from the insertion end to the outlet end, forming an opening at the seam, allowing the inner cavity of the insertion end to connect with the drip hole for dispensing. When the dispensing stops and the bottle is released, the elastic sealing flap returns to its original position and abuts against each other to seal the opening, keeping the outlet end closed. Furthermore, when negative pressure is generated inside the bottle, although the elastic sealing membrane is subjected to pressure from the outside air along the direction from the outlet end to the insertion end, because the elastic sealing membrane is spherical and bulges in the opposite direction, the elastic sealing flap deforms inward under force, forming a tighter abutment, ensuring that the outlet end remains closed.

[0026] In the cap of the liquid bottle described above, the stopper body has a connecting wall that connects the elastic sealing membrane to the inner wall of the straight insertion end. The connecting wall is conical, and its diameter gradually decreases along the direction from the straight insertion end to the liquid outlet end.

[0027] When the bottle is squeezed to dispense liquid, the conical shape of the connecting wall creates a pressurizing effect as the liquid passes through it, ensuring the elastic sealing membrane opens smoothly for dispensing. Furthermore, because the stopper is made of elastic material, the connecting wall deforms radially outward under liquid pressure, pulling the elastic sealing membrane outward and allowing it to open smoothly, thus ensuring stability during dispensing.

[0028] In the aforementioned liquid bottle cap, the cap body includes a separate inner cap and a dropper cap. The inner cap is cylindrical, and the dividing part is disposed on the inner side of the inner cap. The dropper cap includes a protective cylinder, a dripping part disposed on the protective cylinder, an annular connecting part disposed on the outer side of the protective cylinder and protruding outward, and a connecting cylinder disposed on the outer edge of the connecting part and protruding towards the inner cap. The dripping hole is disposed on the dripping part, and the air hole is disposed on the connecting part. The connecting cylinder is fitted onto the inner cap and fixed thereon. The outer edge of the assembly ring is clamped and fixed between the connecting part and the end face of the inner cap facing the dropper cap.

[0029] When assembling bottle caps, the stopper can be placed into the inner cap or dropper cap first, and then the inner cap and dropper cap can be closed and fixed together. Separating the cap into inner cap and dropper cap makes the stopper assembly convenient and makes the stopper fixed and stable between the inner cap and dropper cap, ensuring the stability of the bottle stopper in use.

[0030] In the cap of the liquid bottle described above, the surface of the drip section facing the stopper has an annular protrusion, which abuts against the end face of the liquid outlet.

[0031] The annular protrusion increases the sealing area between the liquid outlet end of the stopper and the cap, improving the sealing performance and the stability of the cap.

[0032] In the cap of the aforementioned liquid bottle, the dividing part has a retaining ring that protrudes away from the insert and surrounds the air guide wall, and a liquid outlet filter membrane is fixed in the retaining ring. During dripping, the liquid outlet filter membrane can filter impurities in the liquid, ensuring the cleanliness of the liquid during dripping.

[0033] In the aforementioned liquid bottle cap, the liquid bottle cap also includes an outer cap fitted onto the outside of the cap body. The outer cap has a sealing protrusion that is inserted into the dropper hole to form a seal. The outer cap has a protruding abutment protrusion located outside the sealing protrusion. The abutment protrusion abuts against the outer edge of the dropper hole. The outer cap has several vent holes located outside the abutment protrusion. The abutment protrusion has several through grooves that connect the dropper hole and the vent holes.

[0034] After the dripping is finished, some liquid will remain in the drip hole. The outer cover is then placed on the outside of the cover body, and the sealing protrusion is inserted into the drip hole to form a seal. The liquid at the inner end of the drip hole is sealed and isolated from the air, while the liquid at the outer end of the drip hole is squeezed out of the drip hole by the sealing protrusion and overflows through the through groove. Then, the air is circulated through the vent hole to form convection, allowing the liquid to evaporate and degrade through evaporation.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. The stopper body is equipped with a normally closed liquid outlet and a cylindrical straight insertion end. The straight insertion end fits against the cylindrical air guide wall inside the cap body. When the air pressure inside the straight insertion end is greater than the external air pressure, the straight insertion end and the air guide wall are sealed, and the liquid outlet end deforms and opens, allowing the inner cavity of the straight insertion end to communicate with the drip hole. When the air pressure inside the straight insertion end is less than the external air pressure, the straight insertion end contracts, allowing the inner cavity of the straight insertion end to communicate with the air hole. This ensures the smooth dripping and resetting of the liquid bottle, improves the stability of the cap, and has a simple structure that is easy to manufacture.

[0037] 2. A protective sleeve is provided on the cap to limit and protect the liquid outlet end, so that the stopper is fixed and stable in the cap, while preventing excessive deformation of the stopper from affecting the stability of the bottle cap.

[0038] 3. An assembly ring is provided on the stopper body. The outer edge of the assembly ring is fixed to the cap body, and the inner edge of the assembly ring is fixed between the insert and the protective tube. An air intake filter membrane is provided on the assembly ring, which not only makes the stopper body fixed and stable in the cap body, but also makes the bottle cap have the function of filtering and inhibiting bacteria while allowing outside air to enter the through hole smoothly.

[0039] 4. The cap body consists of a separate inner cap and a dropper cap, which makes it easy and stable to install the stopper body inside the cap body. At the same time, the structure of the stopper body, inner cap and dropper cap is simple and easy to manufacture.

[0040] 5. The outer cover not only protects the cover body, but also allows for the treatment of residual liquid in the drip hole after the dripping is finished, preventing contaminated liquid from being used in the next dripping. Attached Figure Description

[0041] Figure 1 This is a cross-sectional view of the bottle cap embodiment 1 when it is installed on the bottle body.

[0042] Figure 2 This is a cross-sectional view of the cap and stopper being fixed in Embodiment 1 of this bottle cap.

[0043] Figure 3 This is a cross-sectional view of the cap body in Embodiment 1 of this bottle cap.

[0044] Figure 4 This is a cross-sectional view of the stopper body in Embodiment 1 of this bottle cap.

[0045] Figure 5 yes Figure 4 A partial view in direction A.

[0046] Figure 6 This is a partial view of the stopper at the bottle cap during the dripping process.

[0047] Figure 7 This is a partial view of the bottle cap stopper when the bottle is reset.

[0048] Figure 8 This is a cross-sectional view of the outer cap in Embodiment 1 of this bottle cap.

[0049] Figure 9 yes Figure 8 View B in the diagram.

[0050] In the diagram, 1. Bottle body; 1a. Bottle neck; 1b. Bottle neck; 3. Cap; 3a. Air chamber; 3b. Liquid chamber; 4. Inner cap; 4a. Shoulder; 4b. Snap-fit ​​groove; 4c. Divider; 4d. Fixing ring; 4d1. Snap-fit ​​groove; 4e. Buckle ring; 4f. Positioning groove; 4g. Insert; 4g1. Air guide wall; 4g1a. Air passage section; 4g1b. Sealing section; 4g2. Air passage gap; 4g3. Air passage annular gap; 4g4. Air passage groove; 5. Dropper cap; 5a. Dropping section; 5a1. Dropping hole; 5a1a. First section; 5a1b. Second section; 5a2. Annular protrusion; 5 b. Protective cylinder; 5c. Connecting part; 5c1. Air hole; 5d. Connecting cylinder; 5d1. Snap-fit ​​protrusion; 6. Outer cover; 6a. Main body; 6a1. Sealing protrusion; 6a2. Vent hole; 6a3. Abutting protrusion; 6a4. Through groove; 6b. Unsealing ring; 6c. Connecting strip; 7. Plug; 7a. Liquid outlet end; 7a1. Elastic sealing membrane; 7a1a. Opening slit; 7a1b. Elastic sealing flap; 7b. Assembly ring; 7b1. Air inlet filter membrane; 7b2. Protruding ring; 7c. Connecting wall; 7d. Straight insertion end; 7d1. Flared surface; 8. Liquid outlet filter membrane; 9. Snap-fit ​​bracket. Detailed Implementation

[0051] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0052] Example 1

[0053] like Figure 1 As shown, a bottle cap for a liquid bottle has antibacterial properties. The liquid bottle includes a bottle body 1 and a bottle cap. The bottle body 1 includes a compressible bottle body 1a and a neck 1b integrally formed at the upper end of the bottle body 1a. The bottle cap is fixedly installed at the neck 1b. The bottle cap includes a cap body 3, an outer cap 6, and a stopper 7. The cap body 3 includes a separately connected inner cap 4 and a dropper cap 5. The stopper 7 is made of an elastic material, such as medical rubber.

[0054] like Figure 2 and Figure 3 As shown, the inner cap 4 is cylindrical, and the dropper cap 5 is cap-shaped. The dropper cap 5 is fitted and fixed to the upper end of the inner cap 4. The dropper cap 5 includes a dripping part 5a, a protective cylinder 5b, a connecting part 5c, and a connecting cylinder 5d. Both the protective cylinder 5b and the connecting cylinder 5d are cylindrical. The protective cylinder 5b is located above the connecting cylinder 5d, and the outer diameter of the protective cylinder 5b is smaller than the outer diameter of the connecting cylinder 5d. The dripping part 5a is integrally connected to the upper end of the protective cylinder 5b and closes the upper port of the protective cylinder 5b. A dripping hole 5a1 is opened at the center of the dripping part 5a, and an annular protrusion 5a2 is provided around the dripping hole 5a1 on the lower surface of the dripping part 5a. The connecting part 5c is integrally connected between the protective cylinder 5b and the connecting cylinder 5d. The inner edge of the connecting part 5c is connected to the lower end of the protective cylinder 5b, and the outer edge of the connecting part 5c is connected to the upper end of the connecting cylinder 5d. The connecting part 5c is annular and protrudes outward from the outer side of the protective cylinder 5b. An air hole 5c1 is opened on the connecting part 5c. The dripping orifice 5a1 includes a first segment 5a1a and a second segment 5a1b. The first segment 5a1a is located above the second segment 5a1b. The first segment 5a1a is in the shape of an inverted cone, and the second segment 5a1b is also in the shape of an inverted cone. The minimum diameter of the first segment 5a1a is larger than the maximum diameter of the second segment 5a1b, and the wall surfaces of the first and second segments 5a1a and 5a1b are smoothly transitioned. A liquid storage tank is also provided on the lower surface of the dripping part 5a, outside the second segment 5a1b. An annular protrusion 5a2 is located outside the liquid storage tank, and the cross-section of the liquid storage tank is triangular.

[0055] A shoulder 4a is provided on the outer surface of the upper end of the inner cover 4, and an annular snap-fit ​​groove 4b is also provided on the outer surface of the upper end of the inner cover 4 above the shoulder 4a. A snap-fit ​​protrusion 5d1 corresponding to the snap-fit ​​groove 4b is provided on the inner side of the connecting cylinder 5d. Several snap-fit ​​protrusions 5d1 are arranged sequentially along the circumference. The connecting cylinder 5d is fitted onto the upper end of the inner cover 4, and the lower end face of the connecting cylinder 5d abuts against the shoulder 4a. The snap-fit ​​protrusions 5d1 are embedded in the snap-fit ​​groove 4b, thereby fixing the drip cap 5 and the inner cover 4 together to form the cover body 3. The inner cavity of the drip cap 5 and the inner cavity of the inner cover 4 constitute the inner cavity of the cover body 3. The inner cover 4 has a cylindrical air guide wall 4g1 inside. The inner cover 4 has a partition seat on its side wall that divides the inner cavity of the cover body 3 into an air cavity 3a and a liquid cavity 3b. The air cavity 3a is formed by the drip cap 5, the upper side wall of the inner cover 4 and the partition seat. The air hole 5c1 communicates with the air cavity 3a. The liquid cavity 3b is formed by the side wall of the inner cover 4 located below the partition seat and the partition seat. The liquid cavity 3b is located below the partition seat.

[0056] The separator includes a ring-shaped separator 4c and a cylindrical insert 4g protruding upwards along the inner edge of the separator 4c. The outer edge of the separator 4c is integrally connected to the side wall of the inner cover 4. The inner hole of the insert 4g extends vertically to connect the air chamber 3a and the liquid chamber 3b. The inner surface of the insert 4g is a gas guide wall 4g1. A venting groove 4g4 is formed on the upper end face of the insert 4g, which radially penetrates the insert 4g, i.e., both ends of the venting groove 4g4 penetrate the outer surface of the insert 4g and the gas guide wall 4g1, respectively. There are several venting grooves 4g4 arranged sequentially along the circumference. A chamfer is provided between the upper end face of the insert 4g and the gas guide wall 4g1, which facilitates the insertion of the straight end 7d of the plug 7 into the insert 4g while allowing outside air to enter the space enclosed by the chamfer and the straight end 7d and contact the straight end 7d. The air guide wall 4g1 includes an air passage section 4g1a and a sealing section 4g1b. A stepped surface is located between the air passage section 4g1a and the sealing section 4g1b on the air guide wall 4g1. The air passage section 4g1a is located above the sealing section 4g1b and communicates with the air passage groove 4g4. The aperture of the air passage section 4g1a is larger than that of the sealing section 4g1b. The partition 4c has a fixing ring 4d protruding towards the liquid chamber 3b and surrounding the through hole. A liquid outlet filter membrane 8 is fixed in the fixing ring 4d. A slot 4d1 is formed on the inner side of the fixing ring 4d. An annular retaining bracket 9 is installed on the outer edge of the liquid outlet filter membrane 8. The retaining bracket 9 is inserted into the slot 4d1 and fixed, and the outer side of the retaining bracket 9 seals against the bottom surface of the slot 4d1 to prevent liquid from flowing into the insert 4g through the gap between the fixing ring 4d and the retaining bracket 9.

[0057] like Figure 2 , Figure 4 and Figure 5 As shown, the plug 7 includes a cylindrical straight insertion end 7d and a normally closed liquid outlet end 7a. The straight insertion end 7d is inserted into the insert 4g and fits against the gas guide wall 4g1. When the air pressure inside the straight insertion end 7d is greater than the external air pressure, the straight insertion end 7d and the gas guide wall 4g1 are sealed, and the liquid outlet end 7a deforms and opens, allowing the inner cavity of the straight insertion end 7d to communicate with the drip hole 5a1. When the air pressure inside the straight insertion end 7d is less than the external air pressure, the straight insertion end 7d contracts, allowing the inner cavity of the straight insertion end 7d to communicate with the air hole 5c1. The liquid outlet end 7a is provided with a spherical elastic sealing membrane 7a1 protruding along the direction from the straight insertion end 7d to the liquid outlet end 7a (i.e., towards the drip hole 5a1). An opening slit 7a1a is provided on the elastic sealing membrane 7a1 to form several mutually abutting and sealing elastic sealing flaps 7a1b. Figure 5The opening slit 7a1a shown is in a straight line, dividing the elastic sealing membrane 7a1 in two to form two elastic sealing flaps 7a1b; alternatively, the opening slit 7a1a can be Y-shaped or cross-shaped, dividing the elastic sealing membrane 7a1 in three or four parts, corresponding to three or four elastic sealing flaps 7a1b. The liquid outlet end 7a of the plug body 7 is fixed in the protective cylinder 5b, and the liquid outlet end 7a of the plug body 7 abuts against the top wall of the cover body 3 to form a seal, with the port of the liquid outlet end 7a opposite to the second section 5a1b of the drip hole 5a1. The plug body 7 has a connecting wall 7c connecting the elastic sealing membrane 7a1 and the inner wall of the straight insertion end 7d. The connecting wall 7c is conical, and its diameter gradually decreases along the direction from the straight insertion end 7d to the liquid outlet end 7a. The inner wall of the straight insertion end 7d, the connecting wall 7c, and the inner wall of the liquid outlet end 7a form the liquid outlet hole of the upper and lower penetrating plug body 7.

[0058] An assembly ring 7b is located on the outer surface of the stopper 7, between the liquid outlet end 7a and the straight insertion end 7d. The assembly ring 7b is located in the air chamber 3a, and its outer edge is fixed to the side wall of the cover body 3. An air inlet filter membrane 7b1 is provided on the assembly ring 7b, located below the air hole 5c1. The liquid outlet end 7a is inserted into the protective tube 5b, that is, the protective tube 5b surrounds the outside of the liquid outlet end 7a. The upper end face of the liquid outlet end 7a abuts against the dripping part 5a to form a seal, and the annular protrusion 5a2 on the dripping part 5a is press-fitted against the liquid outlet end 7a. The lower end face of the protective tube 5b abuts against the upper surface of the inner edge of the assembly ring 7b, and the upper end face of the insert 4g abuts against the lower surface of the inner edge of the assembly ring 7b. The outer edge of the assembly ring 7b is clamped and fixed between the upper end face of the inner cover 4 and the connection part 5c of the drip cap 5. The upper surface of the outer edge of the assembly ring 7b has a raised ring 7b2, which presses against the connecting part 5c. The straight end 7d is inserted into the insert 4g, and the straight end 7d fits against the sealing section 4g1b. In order to prevent the liquid stored in the bottle 1 from deteriorating, the straight end 7d and the sealing section 4g1b are usually press-fitted. There is a ventilation annular gap 4g3 between the outer side of the straight end 7d and the hole wall of the air passage section 4g1a, so that the air can apply the pressure of contraction and deformation to the straight end 7d, so that a ventilation gap 4g2 is formed between the straight end 7d and the air guide wall 4g1, which connects the inner cavity of the straight end 7d and the air hole 5c1. The inner side of the port of the straight insertion end 7d has a conical flared surface 7d1. The upper end of the flared surface 7d1 is higher than the stepped surface. This not only helps the straight insertion end 7d to maintain a tight seal with the sealing section 4g1b when dripping liquid, but also helps the air to smoothly push open the straight insertion end 7d to form a ventilation gap 4g2 when the bottle body 1 is reset.

[0059] like Figure 1 and Figure 2As shown, the lower end of the inner cap 4 is fitted over and fixed to the neck 1b of the bottle body 1. The fixing ring 4d is inserted into the neck 1b, and the upper end face of the neck 1b abuts against the lower surface of the partition 4c. A snap ring and a positioning protrusion are provided from top to bottom on the outer surface of the neck 1b. A snap ring 4e and a positioning groove 4f are provided on the inner side of the inner cap 4 below the partition 4c. The lower end of the inner cap 4 is fitted over the neck 1b. The snap ring and the snap ring 4e engage to achieve axial positioning of the inner cap 4 and the bottle body 1. The positioning protrusion is inserted into the positioning groove 4f to achieve axial positioning of the inner cap 4 and the bottle body 1.

[0060] like Figure 1 , Figure 8 and Figure 9 As shown, the outer cover 6 includes a main body 6a and a sealing ring 6b. The sealing ring 6b is located below the main body 6a. The main body 6a is fitted onto the outside of the cover body 3, and the lower end of the main body 6a is threadedly connected to the side wall of the inner cover 4. The sealing ring 6b is fitted onto the outside of the inner cover 4 and fixed. The sealing ring 6b is connected to the lower end of the main body 6a by several connecting strips 6c. The connecting strips 6c can break through the relative rotation between the main body 6a and the sealing ring 6b. The center of the top wall of the main body 6a has a downwardly protruding sealing post 6a1, which is inverted conical in shape. The sealing post 6a1 is inserted into the first section 5a1a of the drip hole 5a1 to form a seal. Several vent holes 6a2 are also provided on the top wall of the main body 6a, which are staggered from the vent holes 5c1 on the cover body 3. On the top wall of the main body 6a, outside the sealing protrusion 6a1, there is a protruding, annular abutment protrusion 6a3. The abutment protrusion 6a3 abuts against the upper end face of the dripping part 5a. The vent hole 6a2 is located outside the abutment protrusion 6a3. Several through grooves 6a4 are formed on the abutment protrusion 6a3 to connect the first section 5a1a of the dripping hole 5a1 with the vent hole 6a2. There are four through grooves 6a4 evenly arranged circumferentially, and there are five vent holes 6a2, including two circular holes and three square holes. After the dripping is complete, some liquid will remain in the dripping hole 5a1. The outer cover 6 is then fitted onto the outside of the cover body 3, and the sealing protrusion 6a1 is inserted into the first section 5a1a of the dripping hole 5a1 to form a seal. The liquid in the second section 5a1b of the dripping hole 5a1 is sealed and isolated from the air, while the liquid in the first section 5a1a of the dripping hole 5a1 is squeezed out of the dripping hole 5a1 by the sealing protrusion 6a1 and overflows through the through groove 6a4. Then, air is circulated and convection is formed using five vent holes 6a2, allowing the liquid to evaporate and degrade. The vent holes 6a2 not only prevent the outer cover 6 from forming a sealed space between it and the cover body 3, thus preventing the outer cover 6 from being unable to open, but also allow air convection, which is beneficial for the evaporation and degradation of the residual liquid.

[0061] During manufacturing, the drip cap 5, inner cap 4, and stopper 7 are machined and formed separately. Then, the liquid outlet end 7a of the stopper 7 is inserted into the protective tube 5b of the dripping. The upper end of the inner cap 4 is then inserted into the connecting tube 5d of the drip cap 5. The straight insertion end 7d of the stopper 7 is inserted into the insert tube 4g. The snap-fit ​​protrusion 5d1 is embedded in the snap-fit ​​groove 4b of the inner cap 4. The cap 3 and the stopper 7 are easy to assemble.

[0062] like Figure 6 As shown, when liquid is needed, remove the outer cap 6, invert or tilt the liquid bottle downwards, and squeeze the bottle body 1a to increase the pressure inside the bottle body 1 (i.e., the air pressure inside the straight insertion end 7d is greater than the external air pressure). After passing through the liquid outlet filter membrane 8, the liquid enters the inner cavity of the straight insertion end 7d of the stopper body 7 from the lower port of the air guide wall 4g1. Since the straight insertion end 7d and the air guide wall 4g1 are tightly sealed, the liquid will not flow out between the air guide wall 4g1 and the straight insertion end 7d. The pressurized liquid acts on the flared surface 7d1, making the side wall of the straight insertion end 7d more... A stable and reliable seal is formed by tightly abutting against the air guide wall 4g1, further preventing liquid from flowing out between the air guide wall 4g1 and the straight insertion end 7d. Simultaneously, the elastic sealing membrane 7a1 of the liquid outlet end 7a is opened by pressure along the direction from the straight insertion end 7d to the liquid outlet end 7a (i.e., pressure towards the dripping hole 5a1). Because the liquid outlet end 7a abuts against the cover body 3 to form a seal, and the upper port of the liquid outlet end 7a is opposite to the dripping hole 5a1, the liquid will not flow to the outer side of the plug body 7 after passing through the liquid outlet end 7a, but will flow directly out from the dripping hole 5a1 to achieve dripping. Figure 7 As shown, after the dripping is completed, the bottle body 1a is relaxed, and a negative pressure is formed inside the bottle body 11 (i.e., the air pressure inside the straight insertion end 7d is less than the external air pressure). The elastic sealing membrane 7a1 of the liquid outlet end 7a resets and closes again. External air enters the air cavity 3a of the cap body 3 through the air hole 5c1. After being filtered and sterilized by the air inlet filter membrane 7b1, it enters the ventilation annular gap 4g3 through the ventilation groove 4g4. Because the external air pressure is greater than the pressure inside the bottle body 1, the external air acts on the straight insertion end 7d, causing the straight insertion end 7d to contract and deform, and forming a ventilation gap 4g2 between the air guide wall 4g1 and the straight insertion end 7d, connecting the air hole 5c1 and the inner cavity of the straight insertion end 7d. External air then enters the bottle body 1. Figure 1 As shown, after the bottle body 1 is reset, the air pressure inside and outside the bottle body 1 is balanced (i.e., the air pressure inside the straight insertion end 7d is equal to the external air pressure). The side wall of the straight insertion end 7d is reset and re-sealed to seal the air guide wall 4g1, preventing the liquid in the bottle body 1 from deteriorating. After the dripping is finished, the outer cap 6 is fitted onto the outside of the cap body 3. The sealing protrusion 6a1 is inserted into the first section 5a1a of the dripping hole 5a1 and forms a seal. The liquid located in the second section 5a1b of the dripping hole 5a1 is squeezed out of the dripping hole 5a1 by the sealing protrusion 6a1 and overflows through the through groove 6a4. Then, the five vent holes 6a2 are used to allow air to circulate and form convection, so that the liquid evaporates and degrades through evaporation, preventing the contaminated liquid from being used in the next dripping.

[0063] During the dripping process of the bottle body 1a, the liquid only enters the stopper 7 and applies pressure to it, without applying pressure to the outer surface of the stopper 7. This ensures that the elastic sealing membrane 7a1 of the outlet end 7a opens smoothly under pressure for dripping. Simultaneously, during the reset process after the bottle body 1a is squeezed, the straight insertion end 7d forms a ventilation gap 4g2 with the air guide wall 4g1, allowing direct connection between the air chamber 3a and the liquid chamber 3b. The straight insertion end 7d's contraction and deformation into its inner cavity does not create any other structures that obstruct air entry, ensuring the smooth reset of the bottle body 1. Therefore, using this cap in liquid bottles not only provides antibacterial protection but also ensures smooth dripping and reset of the liquid bottle, improving the stability of the cap. Furthermore, the stopper 7 and cap 3 have simple structures, are easy to manufacture, and are easy to assemble. This cap can be used not only for eye drop bottles but also for drip-feed ear drops or nasal drops, etc.

[0064] Example 2

[0065] The structure of the dropper cap 5 is slightly different from that of Embodiment 1, but the other structures are the same as those of Embodiment 1. The difference of the dropper cap 5 is that the connecting part 5c is annular and half of its cross-section is shaped like a "7". The inner edge of the connecting part 5c is integrally connected to the upper end of the protective tube 5b, and the outer edge of the connecting part 5c is integrally connected to the upper end of the connecting tube 5d. The outer edge of the connecting part 5c and the upper end face of the cap body 3 clamp and fix the outer edge of the assembly ring 7b of the plug body 7, and the protective tube 5b and the insert 4g clamp and fix the inner edge of the assembly ring 7b.

[0066] Example 3

[0067] The connecting cylinder 5d of the drip cap 5 is integrally formed with the upper side wall of the inner cap 4, and the partition part 4c is separately fixed to the upper side wall of the inner cap 4 to form a seal. For example, the partition part 4c and the side wall of the inner cap 4 are fixed by welding or threaded connection and filled with a sealing ring. Other structures are the same as in Embodiment 1 or Embodiment 2.

[0068] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A cap for a liquid bottle, comprising a cap body (3) and a stopper (7) fixed in the cap body (3), wherein the cap body (3) has an air hole (5c1) and a drip hole (5a1), and the stopper (7) is made of an elastic material, characterized in that, The plug (7) includes a cylindrical straight insertion end (7d) and a normally closed liquid outlet end (7a). The cover (3) has a cylindrical air guide wall (4g1) inside. The straight insertion end (7d) is in contact with the air guide wall (4g1). When the air pressure inside the straight insertion end (7d) is greater than the external air pressure, the straight insertion end (7d) and the air guide wall (4g1) are sealed and the liquid outlet end (7a) deforms and opens so that the inner cavity of the straight insertion end (7d) communicates with the drip hole (5a1). When the air pressure inside the straight insertion end (7d) is less than the external air pressure, the straight insertion end (7d) contracts so that the inner cavity of the straight insertion end (7d) communicates with the air hole (5c1).

2. The cap of the liquid bottle according to claim 1, characterized in that, The inner side of the port of the straight insertion end (7d) has a tapered flared surface (7d1).

3. The cap of the liquid bottle according to claim 1, characterized in that, The air guide wall (4g1) includes an air passage section (4g1a) and a sealing section (4g1b). The air passage section (4g1a) is close to the air hole (5c1) and the diameter of the air passage section (4g1a) is larger than the diameter of the sealing section (4g1b). There is an air passage annular gap (4g3) between the straight insertion end (7d) and the air passage section (4g1a). The straight insertion end (7d) is in contact with the sealing section (4g1b).

4. The cap of the liquid bottle according to any one of claims 1-3, characterized in that, The outer side of the plug (7) has an assembly ring (7b) between the straight insertion end (7d) and the liquid outlet end (7a). The outer edge of the assembly ring (7b) is fixed to the cover (3). An air inlet filter membrane (7b1) is provided on the assembly ring (7b) between the air hole (5c1) and the air guide wall (4g1).

5. The cap of the liquid bottle according to claim 4, characterized in that, The cover (3) has an annular plate-shaped partition (4c) inside, and a cylindrical insert (4g) is integrally provided along the upper edge of the partition (4c). The air guide wall (4g1) is provided on the inner side of the insert (4g).

6. The cap of the liquid bottle according to claim 5, characterized in that, The cover (3) has a protective tube (5b) surrounding the outside of the liquid outlet (7a), the air hole (5c1) is located outside the protective tube (5b), the protective tube (5b) and the insert (4g) are arranged opposite to each other, and the inner edge of the assembly ring (7b) is fixed between the protective tube (5b) and the insert (4g).

7. The cap of the liquid bottle according to claim 6, characterized in that, A venting groove (4g4) is provided on the end face of the insert (4g) facing the protective cylinder (5b), and the two ends of the venting groove (4g4) penetrate the insert (4g) radially.

8. The cap of the liquid bottle according to any one of claims 1-3, characterized in that, The liquid outlet end (7a) is provided with a spherical elastic sealing membrane (7a1) that protrudes along the direction from the straight insertion end (7d) to the liquid outlet end (7a). The elastic sealing membrane (7a1) is provided with an opening slit (7a1a) to form several elastic sealing flaps (7a1b) that abut against each other and seal.

9. The cap of the liquid bottle according to claim 8, characterized in that, The plug body (7) has a connecting wall (7c) that connects the elastic sealing membrane (7a1) and the inner wall of the straight insertion end (7d). The connecting wall (7c) is conical, and the diameter of the connecting wall (7c) gradually decreases along the direction from the straight insertion end (7d) to the liquid outlet end (7a).

10. The cap of the liquid bottle according to any one of claims 1-3, characterized in that, The bottle cap of the liquid bottle also includes an outer cap (6) fitted on the outside of the cap body (3). The outer cap (6) has a sealing protrusion (6a1) that is inserted into the drip hole (5a1) and forms a seal. The outer cap (6) has a protruding abutment protrusion (6a3) on the outside of the sealing protrusion (6a1). The abutment protrusion (6a3) abuts against the outer edge of the drip hole (5a1). The outer cap (6) has a plurality of vent holes (6a2) on the outside of the abutment protrusion (6a3). The abutment protrusion (6a3) has a plurality of through grooves (6a4) that connect the drip hole (5a1) and the vent holes (6a2).

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