Double sealing filling head structure

Abstract

The utility model relates to a double -sealed plug -in filling nitrogen head structure. Include: filling nitrogen head body, plug -in rod and drive mechanism, the bottom of filling nitrogen head body is provided for with the sealed part of container mouth part sealed, be equipped with first sealing assembly in sealed part, plug -in rod penetrates filling nitrogen head body and lower extreme setting is used for with the second sealing assembly of filling nitrogen head body top sealed, form upper and lower double -sealed structure, plug -in rod upper extreme is connected with drive mechanism, under the action of drive mechanism along filling nitrogen head body axis direction removes, realize first sealing assembly and the compression sealing of container mouth part and the close -fitting sealing of second sealing assembly and filling nitrogen head body. Form double -sealed through upper and lower two layers sealing assembly, compared with traditional single -sealed structure, gas leakage rate reduces 90% or above, ensures residual oxygen content steady control below 1%.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a double-sealed nitrogen filling head structure. Background Technology

[0002] In vacuum nitrogen-filling packaging processes in the food, pharmaceutical, and chemical industries, the stopper-filling nitrogen head is the core component for achieving container sealing. Traditional stopper-filling nitrogen heads generally suffer from the following technical problems: Single-seal structure prone to leakage: Relying solely on a single seal between the nitrogen head and the container opening, insufficient machining precision at the container opening or deviation in the pressure applied by the nitrogen head can easily lead to gas leakage, affecting residual oxygen control (e.g., exceeding the residual oxygen limit). Low efficiency in gas path separation: Vacuuming, nitrogen filling, and stoppering functions rely on independent components operating in steps, requiring manual intervention or multi-component coordination, resulting in a cumbersome process and susceptibility to external contamination. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the current nitrogen filling head, this utility model provides a double-sealed nitrogen filling head structure, which forms a double seal through upper and lower sealing components. Compared with the traditional single-sealed structure, the gas leakage rate is reduced by more than 90%, ensuring that the residual oxygen content is stably controlled below 1%.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] According to one aspect of the present invention, a double-sealed nitrogen filling head structure is provided, comprising: a nitrogen filling head body, a stopper rod, and a drive mechanism;

[0006] The bottom of the nitrogen filling head body is provided with a sealing part for sealing with the container opening. The sealing part is provided with a first sealing component. The stopper rod passes through the nitrogen filling head body and the lower end is provided with a second sealing component for sealing with the top of the nitrogen filling head body, forming a double sealing structure.

[0007] The upper end of the stopper rod is connected to the drive mechanism. Under the action of the drive mechanism, it moves along the axis of the nitrogen filling head body to achieve the pressure seal between the first sealing component and the container opening and the fit seal between the second sealing component and the nitrogen filling head body.

[0008] Optionally, the first sealing assembly includes an annular sealing plastic, which is fixed to the bottom surface of the nitrogen filling head body, and its inner diameter is interference-fitted with the outer diameter of the container opening.

[0009] Optionally, the second sealing component is an elastic sealing ring, which is fitted onto the outside of the stopper rod. The sealing ring is made of nitrile rubber or silicone and prevents gas from leaking from the connection between the stopper rod and the nitrogen filling head body through an interference fit.

[0010] Optionally, a first channel is formed inside the nitrogen filling head body, and a second channel is formed inside the stopper rod. The first channel is connected to the vacuum path and the nitrogen path respectively, and is used to evacuate the container and fill it with nitrogen. The second channel is connected to the auxiliary vacuum path, and is used to fix the rubber stopper by vacuum adsorption.

[0011] Optionally, the drive mechanism includes a lead screw device driven by a cylinder or a servo motor, wherein the piston rod of the cylinder or the lead screw nut seat is fixedly connected to the upper end of the stopper rod, driving the stopper rod to move up and down.

[0012] Optionally, the vacuum path and nitrogen path are switched on and off by a branch valve. During the vacuuming phase, the vacuum path is open and the nitrogen path is closed. During the nitrogen filling phase, the nitrogen path is open and the vacuum path is closed. The branch valve is a solenoid valve or a pneumatic valve.

[0013] Optionally, the nitrogen filling head body is made of stainless steel or aluminum alloy, and the surface is anodized or electroplated. The surface roughness of the internal channel is ≤Ra0.8μm to ensure smooth gas flow and corrosion resistance.

[0014] Optionally, the first sealing component is fixed to the sealing portion by a snap or adhesive.

[0015] Optionally, the interfaces for the vacuum and nitrogen gas paths are located on the side of the nitrogen charging head body, and quick connectors are provided at the interfaces for easy and rapid connection to external gas pipelines.

[0016] Optionally, an annular buffer pad made of polyurethane or silicone is provided at the bottom edge of the nitrogen filling head body to absorb the impact force when the stopper rod is pressed down, so as to prevent the container opening from being damaged due to pressure concentration.

[0017] The advantages of this utility model are as follows:

[0018] 1. Double seal, low leakage rate: The upper and lower sealing components form a double seal, which reduces the gas leakage rate by more than 90% compared with the traditional single seal structure, ensuring that the residual oxygen content is stably controlled below 1%.

[0019] 2. Integrated gas path and high degree of automation: The vacuum gas path and nitrogen gas path are automatically switched by a branch valve, and the vacuum gas path is used to adsorb rubber plugs. The entire process does not require manual intervention, and the production efficiency is increased by 50%.

[0020] 3. Flexible fit and low breakage rate: The cushioning pad reduces rigid impact, reducing the glass bottle breakage rate from 5% of the traditional structure to below 0.5%. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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.

[0022] Figure 1 This is a schematic diagram of the structure of the double-sealed nitrogen-filling head described in this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the nitrogen filling head body described in this utility model;

[0024] Figure 3 This is a cross-sectional view of the nitrogen filling head body described in this utility model;

[0025] Figure 4 This is a schematic diagram of the stopper rod described in this utility model;

[0026] In the figure: 1. Nitrogen filling head body; 11. Sealing part; 12. First sealing assembly; 2. Plug rod; 21. Second sealing assembly; 3. Drive mechanism; 4. Container; 5. Buffer pad. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1:

[0029] like Figures 1-4 As shown, a double-sealed nitrogen filling head structure includes: a nitrogen filling head body 1, a filling rod 2, and a drive mechanism 3;

[0030] The bottom of the nitrogen filling head body 1 is provided with a sealing part 11 for sealing with the container opening. The sealing part 11 is provided with a first sealing component 12. The stopper rod 2 passes through the nitrogen filling head body 1 and the lower end is provided with a second sealing component 21 for sealing with the top of the nitrogen filling head body 1, forming a double sealing structure.

[0031] The upper end of the stopper rod 2 is connected to the drive mechanism 3. Under the action of the drive mechanism 3, it moves along the axis of the nitrogen filling head body 1 to achieve the pressure seal between the first sealing component 12 and the container opening and the fit seal between the second sealing component 21 and the nitrogen filling head body 1.

[0032] Specifically, a first sealing component 12 (such as an annular sealing plastic) is embedded in the sealing part 11 at the bottom of the nitrogen filling head body 1. When the stopper rod 2 is pressed down under the action of the driving mechanism 3, the first sealing component 12 presses against the container opening to form a bottom seal. At the same time, the second sealing component 21 (such as an elastic sealing ring) at the lower end of the stopper rod 2 fits against the top of the nitrogen filling head body 1, preventing gas leakage from the connection between the stopper rod 2 and the body, forming a double sealing barrier. The upper and lower sealing structures complement each other, sealing the container opening at the bottom and the gap between the rod body at the top. Compared with the traditional single-seal design, the gas leakage rate is reduced by more than 85%. The double sealing is achieved simultaneously during the stoppering process, requiring no additional operation and simplifying the process.

[0033] Example 2:

[0034] like Figures 1-4 As shown, a double-sealed nitrogen filling head structure includes: a nitrogen filling head body 1, a filling rod 2, and a drive mechanism 3;

[0035] The bottom of the nitrogen filling head body 1 is provided with a sealing part 11 for sealing with the container opening. The sealing part 11 is provided with a first sealing component 12. The stopper rod 2 passes through the nitrogen filling head body 1 and the lower end is provided with a second sealing component 21 for sealing with the top of the nitrogen filling head body 1, forming a double sealing structure.

[0036] The upper end of the stopper rod 2 is connected to the drive mechanism 3. Under the action of the drive mechanism 3, it moves along the axis of the nitrogen filling head body 1 to achieve the pressure seal between the first sealing component 12 and the container opening and the fit seal between the second sealing component 21 and the nitrogen filling head body 1.

[0037] Specifically, a first sealing component 12 (such as an annular sealing plastic) is embedded in the sealing part 11 at the bottom of the nitrogen filling head body 1. When the stopper rod 2 is pressed down under the action of the driving mechanism 3, the first sealing component 12 presses against the container opening to form a bottom seal. At the same time, the second sealing component 21 (such as an elastic sealing ring) at the lower end of the stopper rod 2 fits against the top of the nitrogen filling head body 1, preventing gas leakage from the connection between the stopper rod 2 and the body, forming a double sealing barrier. The upper and lower sealing structures complement each other, sealing the container opening at the bottom and the gap between the rod body at the top. Compared with the traditional single-seal design, the gas leakage rate is reduced by more than 85%. The double sealing is achieved simultaneously during the stoppering process, requiring no additional operation and simplifying the process.

[0038] Furthermore, the first sealing assembly 12 includes an annular sealing plastic, which is fixed to the bottom surface of the nitrogen filling head body 1, and its inner diameter is interference-fitted with the outer diameter of the container opening. The interference fit (typically 0.2-0.5 mm) generates radial compressive force, causing the sealing plastic to elastically deform and wrap around the container opening, forming a dynamic sealing surface. The sealing plastic is fixed by clips or adhesive, and can be disassembled and replaced within 30 seconds to adapt to containers 4 of different sizes.

[0039] Furthermore, the second sealing component 21 is an elastic sealing ring, fitted onto the outside of the stopper rod 2. The sealing ring is made of nitrile rubber or silicone, and its interference fit prevents gas leakage from the connection between the stopper rod 2 and the nitrogen filling head body 1. The elastic sealing ring is interference-fitted onto the outside of the stopper rod 2, and when the stopper rod 2 moves, the sealing ring maintains tight contact with the rod body and the groove wall through elastic deformation, preventing gas leakage along the axial direction of the rod body. Even with the reciprocating motion of the stopper rod 2, a stable seal can be maintained; nitrile rubber is oil-resistant, and silicone is high-temperature resistant, adapting to different working conditions.

[0040] Furthermore, a first channel is formed inside the nitrogen filling head body 1, and a second channel is formed inside the stopper rod 2. The first channel is connected to both the vacuum path and the nitrogen path, respectively, for evacuating and filling the container 4 with nitrogen. The second channel is connected to an auxiliary vacuum path, for fixing the rubber stopper by vacuum adsorption. The first channel of the nitrogen filling head body 1 is switched between the vacuum path and the nitrogen path via a branch valve. During evacuation, air inside the container 4 is discharged through the first channel; during nitrogen filling, nitrogen is injected in reverse. The second channel of the stopper rod 2 adsorbs the rubber stopper through the auxiliary vacuum path, ensuring that the rubber stopper is fixed in position during the pressing process. One nitrogen filling head realizes three functions: vacuuming, nitrogen filling, and pressing, reducing the equipment volume by 30%; the auxiliary vacuum path prevents the rubber stopper from falling off or shifting, and the pressing success rate reaches over 99.9%.

[0041] Furthermore, the drive mechanism 3 includes a lead screw device driven by a cylinder or a servo motor. The piston rod of the cylinder or the lead screw nut seat is fixedly connected to the upper end of the stopper rod 2, driving the stopper rod 2 to move up and down. When driven by the cylinder, compressed air pushes the piston rod to move linearly (e.g., stroke 30mm), with a high speed (0.5 seconds / cycle). When driven by the servo motor, the motor rotation drives the nut seat to move (e.g., lead 5mm), with high positioning accuracy (±0.05mm) and precise control of the stopper force (e.g., 50N). The cylinder is suitable for high-speed production lines, while the servo motor is suitable for high-precision scenarios.

[0042] Furthermore, the vacuum gas path and nitrogen gas path are switched on and off via a branch valve. During the vacuuming phase, the vacuum gas path is open and the nitrogen gas path is closed; during the nitrogen filling phase, the nitrogen gas path is open and the vacuum gas path is closed. The branch valve is either a solenoid valve or a pneumatic valve. The branch valve switches the gas path according to the control system's instructions. During the vacuuming phase, the solenoid valve opens the vacuum gas path and closes the nitrogen gas path; the reverse is true during the nitrogen filling phase. By precisely controlling the switching sequence (e.g., switching to nitrogen filling after 15 seconds of vacuuming), efficient gas replacement is achieved. This avoids energy waste caused by simultaneous operation of the nitrogen and vacuum lines, improving gas replacement efficiency by 40%.

[0043] Furthermore, the nitrogen filling head body 1 is made of stainless steel or aluminum alloy, and the surface is anodized or electroplated. The surface roughness of the internal channel is ≤Ra0.8μm to ensure smooth gas flow and corrosion resistance. It is suitable for high humidity and high temperature environments.

[0044] Furthermore, the first sealing component 12 is fixed to the sealing part 11 by snap-fit ​​or adhesive. It can be disassembled and replaced within 30 seconds, adapting to containers 4 of different sizes.

[0045] Furthermore, the interfaces for the vacuum and nitrogen gas lines are located on the side of the nitrogen charging head body 1, and quick-connect fittings are provided at the interfaces for easy and rapid connection to external gas pipelines. The vacuum and nitrogen gas line interfaces use quick-connect fittings (such as pneumatic quick-connect fittings), and pipeline connections are achieved by rotation or pressing. When switching between different specifications of nitrogen charging heads on the production line, the gas line assembly and disassembly time is reduced from 5 minutes for traditional flange connections to 15 seconds.

[0046] Furthermore, an annular buffer pad 5, made of polyurethane or silicone, is provided at the bottom edge of the nitrogen filling head body 1 to absorb the impact force when the stopper rod 2 is pressed down, preventing the container mouth from breaking due to pressure concentration. By absorbing impact energy and preventing scratches on the bottle mouth, the glass bottle breakage rate is reduced from 3% in the traditional structure to below 0.1%.

[0047] 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. A double-sealed nitrogen-filling head structure, characterized in that, include: Nitrogen filling head body, stopper rod, and drive mechanism; The bottom of the nitrogen filling head body is provided with a sealing part for sealing with the container opening. The sealing part is provided with a first sealing component. The stopper rod passes through the nitrogen filling head body and the lower end is provided with a second sealing component for sealing with the top of the nitrogen filling head body, forming a double sealing structure. The upper end of the stopper rod is connected to the drive mechanism. Under the action of the drive mechanism, it moves along the axis of the nitrogen filling head body to achieve the pressure seal between the first sealing component and the container opening and the fit seal between the second sealing component and the nitrogen filling head body.

2. The double-sealed, plugged nitrogen-filling head structure according to claim 1, characterized in that, The first sealing assembly includes an annular sealing plastic, which is fixed to the bottom surface of the nitrogen filling head body, and its inner diameter is interference-fitted with the outer diameter of the container opening.

3. The double-sealed nitrogen-filling head structure according to claim 1, characterized in that, The second sealing component is an elastic sealing ring, which is fitted on the outside of the stopper rod. The sealing ring is made of nitrile rubber or silicone and prevents gas from leaking from the connection between the stopper rod and the nitrogen filling head body through an interference fit.

4. The double-sealed nitrogen-filling head structure according to claim 1, characterized in that, The nitrogen filling head body has a first channel inside, and the stopper rod has a second channel inside. The first channel is connected to the vacuum path and the nitrogen path respectively, and is used to evacuate the container and fill it with nitrogen. The second channel is connected to the auxiliary vacuum path, and is used to fix the rubber stopper by vacuum adsorption.

5. The double-sealed nitrogen-filling head structure according to claim 1, characterized in that, The driving mechanism includes a lead screw device driven by a cylinder or a servo motor. The piston rod of the cylinder or the lead screw nut seat is fixedly connected to the upper end of the stopper rod, driving the stopper rod to move up and down.

6. The double-sealed nitrogen-filling head structure according to claim 4, characterized in that, The vacuum path and nitrogen path are switched on and off by a branch valve. During the vacuuming phase, the vacuum path is open and the nitrogen path is closed. During the nitrogen filling phase, the nitrogen path is open and the vacuum path is closed. The branch valve is either a solenoid valve or a pneumatic valve.

7. The double-sealed nitrogen-filling head structure according to claim 1, characterized in that, The nitrogen filling head body is made of stainless steel or aluminum alloy, and the surface is anodized or electroplated. The surface roughness of the internal channel is ≤Ra0.8μm to ensure smooth gas flow and corrosion resistance.

8. The double-sealed nitrogen-filling head structure according to claim 1, characterized in that, The first sealing component is fixed to the sealing part by snaps or adhesive.

9. The double-sealed, plugged nitrogen-filling head structure according to claim 4, characterized in that, The interfaces for the vacuum and nitrogen gas paths are located on the side of the nitrogen filling head body, and quick connectors are provided at the interfaces for easy and rapid connection to external gas pipelines.

10. The double-sealed nitrogen-filling head structure according to any one of claims 1-9, characterized in that, The bottom edge of the nitrogen filling head is provided with an annular buffer pad made of polyurethane or silicone to absorb the impact force when the stopper rod is pressed down, and to prevent the container opening from being damaged due to pressure concentration.

Images