Automatic suction pipette packaging structure with pressure balance function
By incorporating a pressure balancing component, including a vent and an elastic seal, between the liquid storage bottle and the dropper assembly, the problem of inaccurate metering caused by the enclosed space in automatic suction droppers is solved, thus achieving accurate liquid metering and product safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN UCAP TECHNOLOGY CO LTD
- Filing Date
- 2025-09-28
- Publication Date
- 2026-07-24
AI Technical Summary
The existing automatic suction dropper causes the pressure inside the bottle to increase when the cap is closed, resulting in the liquid level rising and causing inaccurate dispensing.
A pressure balancing device, including a vent and an elastic seal, is installed between the liquid storage bottle and the dropper assembly. Excess air is discharged through the vent to ensure pressure balance inside the bottle, and the vent is sealed by the elastic seal after the bottle cap is closed to prevent liquid leakage and contamination.
It achieves accurate liquid metering, prevents liquid leakage and contamination, ensures product quality and safety, and requires minimal structural modifications, making it easy to mass-produce.
Smart Images
Figure CN224546843U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging container technology, specifically to an automatic suction dropper packaging structure with pressure balancing function. Background Technology
[0002] In the packaging industry, automatic liquid dispensers are widely used in the packaging of various liquid products such as cosmetics, pharmaceuticals, and food additives due to their ability to dispense a precise amount of liquid. Existing automatic liquid dispensers typically have a two-chambered nozzle. Their working principle involves squeezing the lower nozzle during the cap-closing process, expelling air from the lower nozzle into the bottle. Then, upon opening the cap, the lower nozzle rebounds, drawing up a precise amount of liquid to meet the user's need for quantitative liquid dispensing.
[0003] However, in actual use, existing automatic dispensing droppers create a sealed space inside the bottle because the bottom of the dispensing nozzle immediately contacts the bottle opening (or inner stopper) when the cap is closed. In this situation, the air expelled from the lower dispensing nozzle enters the bottle through the straw and has nowhere to escape due to the confined space. This causes the internal pressure to continuously increase. After the packaging structure has been in place for a period of time, the high pressure inside the bottle pushes the liquid level up, causing the liquid level in the straw to rise. Consequently, when the user opens the cap and squeezes the upper dispensing nozzle, the amount of liquid dispensed far exceeds the designed quantitative standard, severely affecting the product's usability and failing to meet the user's core need for quantitative liquid dispensing. Utility Model Content
[0004] The purpose of this invention is to provide an automatic suction dropper packaging structure with pressure balancing function to solve the above problems, as detailed below.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] This utility model provides an automatic suction dropper packaging structure with pressure balancing function, including a liquid storage bottle and a dropper assembly. The dropper assembly with quantitative dispensing function is detachably assembled at the top opening of the liquid storage bottle. A pressure balancing component with venting and sealing functions is assembled between the top of the liquid storage bottle and the dropper assembly. When the dropper assembly is installed, the pressure balancing component is used to promptly expel excess air from the liquid storage bottle to ensure stable pressure balance within the liquid storage bottle.
[0007] Preferably, the dropper assembly includes a cap and a straw. The cap is detachably assembled on the top of the liquid storage bottle, and a lower cavity rubber head is coaxially fixedly disposed on the inner top of the cap. The top and bottom ends of the lower cavity rubber head are respectively fixedly connected to an upper cavity rubber head and the straw. The upper cavity rubber head protrudes from the top of the cap, and the lower end of the straw extends into the interior of the liquid storage bottle.
[0008] Preferably, the pressure balancing component specifically comprises an inner plug coaxially pressed and fixed at the mouth of the liquid storage bottle, the top of the inner plug having at least one vent hole, and the vent hole being a through hole; and an elastic sealing component coaxially fixed and assembled inside the bottle cap at the periphery of the rubber head in the lower cavity, and when the bottle cap is fully closed and installed at the top mouth of the liquid storage bottle, the elastic sealing component presses and seals the top of the vent hole.
[0009] Preferably, the bottle cap and the top opening of the liquid storage bottle are coaxially and detachably assembled via a threaded connection.
[0010] Preferably, the inner plug and the vent hole are integrally molded injection molded parts.
[0011] Preferably, the pressure balancing component specifically comprises a liquid storage bottle body that is an open-top cylindrical body with a shoulder sleeve coaxially fixed to its top periphery via a connecting part. The bottle cap is detachably attached to the top periphery of the shoulder sleeve. At least one vent hole is pre-reserved on the top surface of the shoulder sleeve below the bottom end of the bottle cap, and the vent hole is a through hole. An annular storage groove is provided on the bottom end face of the bottle cap above the vent hole. An elastic sealing element is coaxially embedded and fixed in the storage groove. When the bottle cap is fully closed and installed on the top of the shoulder sleeve, the elastic sealing element presses and seals the top end of the vent hole.
[0012] Preferably, the connecting part is a threaded part, and the shoulder sleeve is coaxially assembled on the top of the liquid storage bottle body by means of threaded engagement.
[0013] Preferably, the shoulder sleeve and the connecting part are integrally molded injection molded parts.
[0014] Preferably, the bottle cap and the top of the shoulder sleeve are coaxially and detachably assembled via a threaded connection.
[0015] Preferably, the elastic seal is a rubber sealing ring or a TPE sealing ring.
[0016] The aforementioned automatic suction dropper packaging structure with pressure balancing function, in practical use, features a pressure balancing component with venting and sealing functions, integrated between the top of the liquid storage bottle and the dropper assembly. Each pressure balancing component has a vent hole. During the closing of the bottle cap, the vent holes of the pressure balancing component allow excess air to be promptly expelled from the liquid storage bottle, preventing pressure buildup and a rise in the liquid level within the dropper. This ensures that the amount of liquid squeezed out when the upper cavity rubber head is squeezed after opening the bottle cap meets the designed quantitative standard, preventing inaccurate dispensing by the dropper assembly. Furthermore, the pressure balancing component is equipped with an elastic sealing element. After the cap is fully closed and installed on top of the liquid storage bottle, the vent hole is sealed by pressing the elastic seal against the top of the vent hole. This ensures a stable, sealed space within the liquid storage bottle, preventing leakage and evaporation of the liquid and blocking external dust, microorganisms, and other contaminants from entering the bottle, thus guaranteeing product quality and safety. Furthermore, the pressure balancing component is simple to implement; it only requires adding the vent hole and the elastic seal to the existing automatic dispensing dropper packaging structure to achieve pressure balancing. The structural changes are minor, the manufacturing process is simple, and there is no need for significant adjustments to production equipment, making it easy to mass-produce and promote its application.
[0017] The beneficial effects are as follows: 1. This utility model has a pressure balancing component with venting and sealing functions combined between the top of the liquid storage bottle and the dropper assembly. At the same time, the pressure balancing component is provided with vent holes. Then, during the process of closing the bottle cap, the vent holes of the pressure balancing component can timely expel excess air from the liquid storage bottle, avoid the pressure inside the liquid storage bottle from increasing and causing the liquid level in the straw to rise, thereby ensuring that the amount of liquid squeezed out when the upper cavity rubber head is squeezed after opening the bottle cap meets the design quantitative standard, and prevent the dropper assembly from being inaccurate in quantitative measurement.
[0018] 2. All pressure balancing components are equipped with elastic seals. After the bottle cap is fully closed and installed on the top of the liquid storage bottle, the elastic seals press against the top of the vent hole to seal it, ensuring that a stable sealed space is formed inside the liquid storage bottle. This prevents liquid leakage and evaporation from the liquid storage bottle, and also blocks external dust, microorganisms and other contaminants from entering the liquid storage bottle, ensuring product quality and safety in use.
[0019] 3. The pressure balancing component has a simple and easy-to-implement structure. It only requires adding two key components, a vent and an elastic seal, to the existing automatic suction dropper packaging structure to achieve the pressure balancing function of the liquid storage bottle. The structural changes are minor, the manufacturing process is simple, and there is no need to make major adjustments to the production equipment, making it easy to mass-produce and promote its application. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a cross-sectional view of the bottle cap of this utility model in the open state. Figure 1 ;
[0022] Figure 2 This is a cross-sectional view of the bottle cap in the closed state of this utility model. Figure 1 ;
[0023] Figure 3 This is a cross-sectional view of the bottle cap of this utility model in the open state. Figure 2 ;
[0024] Figure 4 This is a cross-sectional view of the bottle cap in the closed state of this utility model. Figure 2 .
[0025] The annotations in the attached figures are explained as follows:
[0026] 1. Pressure balancing component; 101. Elastic seal; 102. Vent hole; 103. Inner plug; 104. Storage groove; 105. Shoulder sleeve; 106. Connecting part; 2. Liquid storage bottle body; 3. Dropper assembly; 301. Upper chamber rubber head; 302. Lower chamber rubber head; 303. Bottle cap; 304. Straw. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0028] Example 1:
[0029] See Figures 1-2As shown, this utility model provides an automatic suction dropper packaging structure with pressure balancing function, including a liquid storage bottle 2 and a dropper assembly 3. The dropper assembly 3 with quantitative dispensing function is detachably assembled at the top opening of the liquid storage bottle 2. A pressure balancing component 1 with venting and sealing functions is assembled between the top of the liquid storage bottle 2 and the dropper assembly 3. When the dropper assembly 3 is installed, the pressure balancing component 1 is used to promptly expel excess air in the liquid storage bottle 2 to ensure stable pressure balance in the liquid storage bottle 2. Specifically, the pressure balancing component 1 is as follows: an inner plug 103 is coaxially pressed and fixed at the opening of the liquid storage bottle 2. The top of the inner plug 103 has at least one vent hole 102, and the vent hole 102 is a through hole. An elastic sealing component 101 is coaxially fixed and assembled inside the bottle cap 303 at the periphery of the lower cavity rubber head 302. Furthermore, after the bottle cap 303 is fully closed and installed at the top opening of the liquid storage bottle 2, the elastic sealing element 101 presses and seals the top of the vent hole 102. The purpose of this setting is that, firstly, during the process of closing the bottle cap 303, the vent hole 102 of the pressure balancing element 1 can promptly expel excess air from the liquid storage bottle 2, preventing the pressure inside the liquid storage bottle 2 from increasing and causing the liquid level in the straw 304 to rise. This ensures that the amount of liquid squeezed out when the upper cavity rubber head 301 is squeezed after opening the bottle cap 303 meets the designed quantitative standard, preventing the dropper assembly 3 from being inaccurate in its quantitative measurement. At the same time, after the bottle cap 303 is fully closed and installed at the top opening of the liquid storage bottle 2, the elastic sealing element 101 presses and seals the top of the vent hole 102, ensuring that a stable sealed space can be formed inside the liquid storage bottle 2.
[0030] See Figures 1-2 As shown, the present application has been refined as follows: Specifically, the dropper assembly 3 includes a cap 303 and a straw 304. The cap 303 is detachably assembled on the top of the liquid storage bottle 2, and a lower cavity rubber head 302 is coaxially fixedly configured on the inner top of the cap 303. The top and bottom ends of the lower cavity rubber head 302 are respectively fixedly connected to an upper cavity rubber head 301 and a straw 304, with the upper cavity rubber head 301 protruding from the top of the cap 303. The lower end of the straw 304 extends into the interior of the liquid storage bottle 2, so as to achieve quantitative aspiration of liquid in the liquid storage bottle 2 by means of the dropper assembly 3, facilitating subsequent quantitative dispensing operations. Optionally, the cap 303 and the top opening of the liquid storage bottle 2 can be coaxially and detachably assembled by means of a threaded connection, so as to achieve quick assembly and disassembly of the cap 303 and the top opening of the liquid storage bottle 2 by twisting. Furthermore, the inner plug 103 and the vent hole 102 are integrally molded injection parts. This design facilitates the manufacturing and processing of the inner plug 103, and also allows the vent hole 102 to be pre-designed during the processing stage of the inner plug 103.
[0031] Example 2:
[0032] See Figures 3-4 As shown, another optional solution is provided. Specifically, the pressure balancing component 1 consists of a liquid storage bottle 2 that is an open-top cylindrical body with a shoulder sleeve 105 coaxially fixed to its top periphery via a connecting part 106. A bottle cap 303 is detachably attached to the top periphery of the shoulder sleeve 105. At least one vent hole 102 is pre-drilled on the top surface of the shoulder sleeve 105 below the bottom end of the bottle cap 303. The vent hole 102 is a through hole. An annular storage groove 104 is provided on the bottom surface of the bottle cap 303 above the vent hole 102. An elastic sealing element 101 is coaxially embedded and fixed in the storage groove 104. When the bottle cap 303 is fully closed and mounted on the top of the shoulder sleeve 105, the elastic sealing element 101 presses and seals the top of the vent hole 102. The purpose of this arrangement is to allow excess air in the liquid storage bottle 2 to be expelled in a timely manner through the vent 102 of the pressure balance component 1 during the process of closing the bottle cap 303. This prevents the pressure inside the liquid storage bottle 2 from increasing and causing the liquid level in the straw 304 to rise, thereby ensuring that the amount of liquid squeezed out when the upper cavity rubber head 301 is squeezed after opening the bottle cap 303 meets the designed quantitative standard and prevents the dropper assembly 3 from being inaccurate in its quantitative measure. The pressure balance component 1 is equipped with an elastic sealing element 101. After the bottle cap 303 is fully closed and installed on the top of the shoulder sleeve 105, the elastic sealing element 101 is pressed against the top of the vent 102 to seal the vent 102, ensuring that a stable sealed space can be formed inside the liquid storage bottle 2.
[0033] See Figures 3-4 As shown, the above solution has been optimized as follows: Specifically, the connecting part 106 is a threaded part, and the shoulder sleeve 105 is coaxially assembled to the top of the liquid storage bottle 2 through a threaded connection, so that the shoulder sleeve 105 can be quickly and integrally assembled to the top of the liquid storage bottle 2 through a threaded connection. Optionally, the shoulder sleeve 105 and the connecting part 106 can be integrally molded injection parts. This configuration facilitates the convenient manufacturing of the shoulder sleeve 105 through injection molding, and also allows the connecting part 106 to be pre-designed during the processing stage of the shoulder sleeve 105. Further optionally, the bottle cap 303 and the top of the shoulder sleeve 105 can be detachably assembled and disassembled coaxially through a threaded connection, so that the bottle cap 303 and the shoulder sleeve 105 can be quickly assembled and disassembled by twisting. Furthermore, the elastic seal 101 is a rubber sealing ring or a TPE sealing ring, so that the elastic seal 101 has a good elastic deformation effect, and at the same time, it is convenient to achieve a stable seal on the top of the vent 102 by means of the elastic seal 101 being pressed against the top of the vent 102.
[0034] With the above structure, in practical use, a pressure balancing component 1 with venting and sealing functions is combined between the top of the liquid storage bottle 2 and the dropper assembly 3. Each pressure balancing component 1 is equipped with a vent hole 102. Therefore, during the process of closing the bottle cap 303, excess air in the liquid storage bottle 2 can be promptly expelled through the vent holes 102 of the pressure balancing component 1. This prevents the pressure inside the liquid storage bottle 2 from increasing, which would cause the liquid level in the pipette 304 to rise. This ensures that the amount of liquid squeezed out when the upper cavity rubber head 301 is squeezed after opening the bottle cap 303 meets the designed quantitative standard, preventing inaccurate metering by the dropper assembly 3. Furthermore, since each pressure balancing component 1 is equipped with an elastic sealing element 101, the liquid level can be further controlled when the bottle cap 303 is fully closed. Fortunately, the top of the liquid storage bottle 2 is sealed by the elastic sealing element 101 pressing against the top of the vent 102, ensuring a stable and sealed space inside the liquid storage bottle 2. This prevents liquid leakage and evaporation from the liquid storage bottle 2, and also blocks external dust, microorganisms, and other contaminants from entering the liquid storage bottle 2, ensuring product quality and safety. Furthermore, the pressure balancing element 1 has a simple and easy-to-implement structure. It only requires adding two key components, the vent 102 and the elastic sealing element 101, to the existing automatic suction dropper packaging structure to achieve the pressure balancing function of the liquid storage bottle 2. The structural modification is small, the manufacturing process is simple, and there is no need to make significant adjustments to the production equipment, making it easy to mass-produce and promote its application.
[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. An automatic suction dropper packaging structure with pressure balancing function, comprising a liquid storage bottle (2) and a dropper assembly (3), characterized in that: The top of the liquid storage bottle (2) is detachably connected to the dropper assembly (3) with a quantitative dripping function. A pressure balancer (1) with venting and sealing functions is provided between the top of the liquid storage bottle (2) and the dropper assembly (3). When the dropper assembly (3) is installed, the pressure balancer (1) is used to promptly expel excess air from the liquid storage bottle (2) to ensure that the pressure balance inside the liquid storage bottle (2) is stable.
2. The automatic suction dropper packaging structure with pressure balancing function according to claim 1, characterized in that: The dropper assembly (3) includes a bottle cap (303) and a straw (304). The bottle cap (303) is detachably assembled on the top of the liquid storage bottle (2). A lower cavity rubber head (302) is coaxially fixedly arranged on the inner top of the bottle cap (303). The top and bottom ends of the lower cavity rubber head (302) are respectively fixedly connected to an upper cavity rubber head (301) and the straw (304). The upper cavity rubber head (301) protrudes from the top of the bottle cap (303), and the lower end of the straw (304) extends into the interior of the liquid storage bottle (2).
3. The automatic suction dropper packaging structure with pressure balancing function according to claim 2, characterized in that: Specifically, the pressure balancing component (1) is as follows: an inner plug (103) is coaxially pressed and fixed at the mouth of the liquid storage bottle (2). At least one vent hole (102) is reserved at the top of the inner plug (103), and the vent hole (102) is a through hole. An elastic sealing component (101) is coaxially fixed and assembled inside the bottle cap (303) at the position outside the lower cavity rubber head (302). When the bottle cap (303) is completely closed and installed at the top mouth of the liquid storage bottle (2), the elastic sealing component (101) presses and seals the top of the vent hole (102).
4. The automatic suction dropper packaging structure with pressure balancing function according to claim 3, characterized in that: The bottle cap (303) and the top opening of the liquid storage bottle (2) are coaxially and detachably assembled by means of threaded connection.
5. The automatic suction dropper packaging structure with pressure balancing function according to claim 4, characterized in that: The inner plug (103) and the vent (102) are integrally molded injection parts.
6. The automatic suction dropper packaging structure with pressure balancing function according to claim 2, characterized in that: Specifically, the pressure balancing component (1) is a cylindrical body (2) with an open top and a shoulder sleeve (105) coaxially fixed to the outer periphery of the top via a connecting part (106). The bottle cap (303) is detachably attached to the outer periphery of the top of the shoulder sleeve (105). At least one vent hole (102) is reserved on the top surface of the shoulder sleeve (105) below the bottom end of the bottle cap (303), and the vent hole (102) is a through hole. An annular storage groove (104) is provided on the bottom surface of the bottle cap (303) above the vent hole (102). An elastic sealing component (101) is coaxially embedded and fixed in the storage groove (104). When the bottle cap (303) is completely closed and installed on the top of the shoulder sleeve (105), the elastic sealing component (101) presses and seals the top end of the vent hole (102).
7. The automatic suction dropper packaging structure with pressure balancing function according to claim 6, characterized in that: The connecting part (106) is a threaded part, and the shoulder sleeve (105) is coaxially assembled on the top of the liquid storage bottle body (2) by means of threaded engagement.
8. The automatic suction dropper packaging structure with pressure balancing function according to claim 7, characterized in that: The shoulder sleeve (105) and the connecting part (106) are integrally molded injection parts.
9. The automatic suction dropper packaging structure with pressure balancing function according to claim 8, characterized in that: The bottle cap (303) and the top of the shoulder sleeve (105) are coaxially and detachably assembled by means of a threaded connection.
10. An automatic suction dropper packaging structure with pressure balancing function according to any one of claims 3-9, characterized in that: The elastic seal (101) is a rubber seal ring or a TPE seal ring.