A closure and filler tube assembly for a filling machine

Abstract

The utility model relates to a filling machine technical field, the utility model provides a kind of plugging member for filling machine, for plugging the ventilation gap between mutually sleeved filling pipe and forming pipe, comprising: plugging member, for being set on filling pipe, plugging member is equipped with flexible skirt, flexible skirt gradually increases in diameter from bottom to top, and the axial end for plugging ventilation gap is used for plugging the ventilation gap.The utility model further provides a kind of filling pipe assembly, concentric ring is arranged in ventilation gap, concentric ring has the number be several and be arranged in the inner projection of the inner wall of concentric ring along the circumferential interval, inner projection is used for being contacted with the outer wall of filling pipe, and first ventilation opening is between adjacent two inner projections.It is closely fitted with flexible skirt forming pipe inner wall, plugging the axial entrance of ventilation gap, forms enclosed cleaning space.No steam or cleaning fluid leakage, and because plugging member and filling pipe synchronous movement, no relative friction, avoid the leakage risk caused by the wear of sealing ring in traditional structure.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of filling machine technology, specifically to a sealing component and filling tube assembly for a filling machine. Background Technology

[0002] In the pharmaceutical and health product manufacturing industry, strip bag oral liquid filling machines are used to produce strip bag oral liquids. These machines need to efficiently complete the quantitative filling and strip bag formation of oral liquids, and also need to have an online CIP (Clean In Place) function. This function uses high-temperature cleaning or disinfectant to circulate and rinse the forming tubes, filling tubes, and cavities that come into contact with the materials, removing residual drug liquid and microorganisms to meet the GMP (Good Manufacturing Practice) requirements for equipment cleanliness.

[0003] In this system, the forming tube and the filling tube need to be sealed together using a CIP forming and sealing device. During CIP cleaning, it is essential to ensure that the cleaning fluid or cleaning vapor flows within the closed pipeline without leakage, thus achieving disinfection. In traditional equipment, an inner rubber ring is installed between the inner wall of the sealing device and the outer wall of the filling tube to prevent leakage of the cleaning fluid or inclined gas. Simultaneously, the forming tube is fitted over the outside of the filling tube, and an outer rubber ring is installed between the inner wall of the forming tube and the outer wall of the filling tube to achieve a seal between the forming tube and the filling tube.

[0004] However, when switching equipment states, specifically between CIP cleaning and filling states, the sealing device needs to be manually lifted or lowered. Specifically, when switching to filling state, the positioning block needs to be lifted axially along the filling tube, causing the outer rubber ring to detach from the inner wall of the forming tube and release the seal. When switching to CIP state, the positioning block needs to be pressed down, causing the outer rubber ring to re-press against the inner wall of the forming tube to form a seal. However, due to the combined friction between the inner rubber ring and the outer wall of the filling tube, and the outer rubber ring and the inner wall of the forming tube, lifting and pressing the positioning block requires overcoming dual frictional resistance. This necessitates manual operation using tools such as screwdrivers and pry bars, leveraging the lever principle to pry the positioning block, forcing it to slide along the filling tube through external force.

[0005] First, as the inner rubber ring slides along the filling tube with the positioning block, it rubs against the outer wall of the filling tube. Frequent operation causes wear and tear on the surface of the inner rubber ring, leading to localized brittleness and even annular cracks, resulting in decreased sealing performance. The outer rubber ring is easily carried away from the mounting groove from the gap between the molding tube and the filling tube, further causing leakage of cleaning gas or liquid during CIP cleaning. This affects the cleaning pressure inside the molding tube or introduces external air during cleaning, impacting the cleaning effect. Secondly, each switch requires repeated adjustment of the tool fulcrum to ensure that the positioning block is subjected to uniform force, and to avoid uneven wear of the rubber ring or jamming of the positioning block due to tilting, as well as wear and concentricity deviation of the parts.

[0006] Secondly, the positioning block is easily deformed and curled at its edges due to long-term prying with tools, which increases the frequency of replacement and maintenance. Furthermore, external prying can easily cause the installation reference of the filling tube and the forming tube to shift, which will damage their concentricity. Concentricity deviation will cause misalignment of the strip bag during filling or uneven distribution of water flow in the pipeline gaps during CIP cleaning, resulting in local residues that cannot be removed. Utility Model Content

[0007] To overcome the above-mentioned defects, this utility model provides a sealing component and filling tube assembly for a filling machine, which solves the technical problems in the prior art where the sealing device and the forming tube and the filling tube are sealed by an outer rubber ring and an inner rubber ring, which is time-consuming and laborious when switching equipment states, the inner and outer rubber rings are easy to wear, affecting the sealing performance and cleaning effect, and the positioning block wears quickly, requiring a high frequency of replacement and maintenance, and affecting the concentricity of the filling tube and the positioning tube.

[0008] According to one aspect, at least one embodiment of the present invention provides a sealing component for a filling machine, used to seal the air gap between a filling tube and a forming tube that are nested together, comprising: The sealing component has a flexible cylindrical part and a flexible skirt around the periphery of the flexible cylindrical part. The flexible cylindrical part is used to be fitted onto the filling tube, and the diameter of the flexible skirt gradually increases from bottom to top, and is used to seal one end of the axial part of the venting gap.

[0009] For example, in a sealing component for a filling machine provided in at least one embodiment of the present invention, the angle between the flexible skirt and the axis of the flexible cylinder is α, where 40°≤α≤45°.

[0010] For example, in at least one embodiment of the present invention, a sealing component for a filling machine is provided, wherein there are two flexible skirts, which are spaced apart along the axial direction of the flexible cylinder.

[0011] For example, in a sealing component for a filling machine provided in at least one embodiment of the present invention, a positioning block is sleeved on the outer periphery of the sealing component, and the positioning block has an insertion groove; The sealing element has a mating protrusion for mating with the mating slot, so that the positioning block and the sealing element can be detachably connected.

[0012] For example, in a sealing component for a filling machine provided in at least one embodiment of the present invention, the positioning block also has a through-hole, which is located above the insertion groove, and the inner diameter of the through-hole is adapted to the outer diameter of the filling tube.

[0013] According to another aspect, at least one embodiment of the present invention also provides a filling tube assembly, using a sealing element for a filling machine, and further comprising: A concentric ring is set in the venting gap. The concentric ring has a number of inner protrusions arranged circumferentially on the inner wall of the concentric ring. The inner protrusions are used to contact the outer wall of the filling tube. There is a first vent between two adjacent inner protrusions.

[0014] For example, in a filling tube assembly provided in at least one embodiment of the present invention, the concentric ring further has a number of external protrusions arranged circumferentially on the outer wall of the concentric ring, the external protrusions are used to contact the outer wall of the forming tube, and a second vent is provided between two adjacent external protrusions.

[0015] For example, in a filling tube assembly provided by at least one embodiment of the present invention, the circumferential angle of the inner protrusion is N, and the circumferential angle of the first vent is Y, wherein 1.8≤N / Y≤2.

[0016] For example, in a filling tube assembly provided by at least one embodiment of the present invention, the circumferential angle of the outward protrusion is W, and the circumferential angle of the second vent is E, wherein 1.8≤W / E≤2.

[0017] For example, in a filling tube assembly provided in at least one embodiment of the present invention, the concentric ring is an elastic structure with a through deformation port, and the side of the concentric ring is also provided with a snap-fit ​​protrusion, and the forming tube has a snap-fit ​​interface through which the snap-fit ​​protrusion is snapped in the radial direction.

[0018] The beneficial effects of the embodiments of this utility model are as follows: In this invention, during the filling process, the sealing element moves upward, forming a certain gap with the upper end face of the forming tube. At this time, the flexible skirt does not contact the forming tube, and the venting gap is fully open. During operation, the filling tube extends downward into the strip bag and injects the oral liquid. The air inside the strip bag is compressed upward by the liquid, rises through the venting gap between the forming tube and the filling tube, and finally exits from the gap between the sealing element and the forming tube. This avoids inaccurate filling or bag bulging caused by residual gas inside the strip bag, and reduces and controls the dosage error of each bag of oral liquid.

[0019] In the sterilization state, the sealing element moves downward, and the lower end of the flexible skirt inserts into the venting gap. Due to its trumpet-shaped structure and elastic deformation, it can tightly conform to the inner wall of the molding tube, sealing the axial entrance of the venting gap and forming a closed cleaning space. The elastic deformation of the flexible skirt can compensate for minor concentricity deviations between the filling tube and the molding tube, ensuring a tight seal and preventing steam or cleaning fluid leakage. At the same time, because the sealing element and the filling tube move synchronously, there is no relative friction, avoiding the leakage risk caused by seal ring wear in traditional structures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a filling tube assembly in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the internal cross-sectional structure in the embodiment; Figure 3 for Figure 2 A magnified schematic diagram of the structure of part A in the diagram; Figure 4 for Figure 2 A magnified schematic diagram of the partial structure of B in the diagram; Figure 5 for Figure 1 A bottom view of the structure in the embodiment; Figure 6 for Figure 1 A schematic diagram of the concentric ring structure in the embodiment; Figure 7 for Figure 1 A schematic diagram of the angle of the concentric rings in the embodiment; Figure 8 This is a schematic diagram of the structure of a concentric ring according to another embodiment; Figure 9 This is a schematic diagram of the structure of a positioning block for a sealing component in a filling machine according to one embodiment of the present invention.

[0022] In the diagram: 100, sealing element; 110, flexible cylinder; 120, flexible skirt; 130, insertion protrusion; 200, filling tube; 300, forming tube; 310, snap-fit ​​interface; 320, branch pipe; 400, vent gap; 500, positioning block; 510, insertion groove; 520, opening; 600, concentric ring; 610, inner protrusion; 620, first vent; 630, outer protrusion; 640, second vent; 650, deformation port; 660, snap-fit ​​protrusion. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0024] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0025] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-9As shown, it illustrates a sealing component 100 for a filling machine in one embodiment of the present invention. The sealing component 100 is mainly used to seal the air gap 400 between the filling tube 200 and the forming tube 300 that are nested together in the filling machine. That is, the filling tube 200 passes through the inside of the forming tube 300, and the two are coaxially distributed, forming an annular air gap 400. The sealing component 100 achieves the function of sealing and cleaning by cooperating with the air gap 400.

[0030] The sealing component 100 includes a flexible cylindrical portion 110 and a flexible skirt 120. As a preferred example, the flexible cylindrical portion 110 and the flexible skirt 120 can be integrally molded. Both the flexible cylindrical portion 110 and the flexible skirt 120 are made of a flexible material with elastic deformation capability, such as food-grade silicone, which has good deformation adaptability and sealing reliability.

[0031] The flexible cylindrical portion 110 is hollow and cylindrical. As a preferred example, the inner diameter of the flexible cylindrical portion 110 can be slightly smaller than the outer diameter of the filling tube 200, such as 0.1-0.3 mm smaller. Through its own elastic deformation, it tightly fits onto the outer wall of the filling tube 200, forming a radial seal to prevent fluid or gas leakage from the gap between the sealing element 100 and the filling tube 200. Simultaneously, it can limit the axial position of the sealing element 100 and the filling tube 200. A flexible skirt 120 is arranged around the flexible cylindrical portion 110, with its diameter gradually increasing from bottom to top, extending in a trumpet shape. The maximum diameter of the flexible skirt 120 is adapted to the inner diameter of the forming tube 300. As a preferred example, the maximum diameter of the flexible skirt 120 can be slightly larger than the inner diameter of the forming tube 300 by 0.5-1 mm, achieving sealing of the ventilation gap 400 through elastic deformation.

[0032] Based on the above scheme, an optimized filling machine structure is proposed. The filling machine is equipped with a movable frame that is driven by a cylinder or screw. A row of multiple filling tubes 200 arranged at intervals is fixed on the movable frame. The lower end of each filling tube 200 is fitted with the aforementioned sealing element 100. The forming tube 300 is fixed on the frame and is coaxially distributed in a one-to-one correspondence with the row of filling tubes 200. By raising and lowering the movable frame, the multiple filling tubes 200 in the row can be directly driven to rise or fall, and the flexible skirt 120 of the sealing element 100 fitted on the filling tube 200 can be driven to seal or unseal the ventilation gap 400. The flexible skirt 120 provides the basis for this overall lifting.

[0033] If the traditional inner and outer sealing sleeve method is still used, it is impossible to use a moving frame to drive the lifting and lowering in a unified manner. This is because the sealing ring itself has a large frictional force, and the traditional outer sealing sleeve is fitted onto the cylindrical end of the rigid positioning block 500. There will be a problem with the alignment accuracy between the rigid cylindrical end and the upper port of the forming tube 300. If the rigid cylindrical end and the upper port of the forming tube 300 cannot be accurately aligned when moving up and down with a large mechanical force, it will cause significant damage to the rigid cylindrical end and the upper port of the forming tube 300. Therefore, it is impossible to use a moving frame to drive the lifting and lowering in a unified manner. The flexible sealing component 100 achieves this function. When descending, the flexible skirt 120 achieves sealing, and the inner diameter of the flexible cylindrical part 110 can be slightly smaller than the inner diameter of the filling tube 200 to achieve sealing between the sealing component 100 and the filling tube 200 and axial locking between them. This allows the sealing component 100 to move synchronously when the filling tube 200 moves up and down, avoiding relative displacement between the filling tube 200 and the sealing component 100 and preventing damage to the components.

[0034] Specifically, taking the optimized filling machine structure with the aforementioned sealing component 100 as an example, in the filling state, the moving frame drives the filling pipe 200 to rise, and the sealing component 100 moves upward accordingly, such as... Figure 1 and Figure 2 As shown, a certain distance is formed between the flexible skirt 120 and the upper end face of the forming tube 300. At this time, the flexible skirt 120 does not contact the forming tube 300, and the ventilation gap 400 is in a fully open state. During operation, the filling tube 200 extends downward into the strip bag and injects oral liquid. The air in the strip bag is squeezed upward by the liquid and rises through the ventilation gap 400 between the forming tube 300 and the filling tube 200. Finally, it is discharged from the gap between the sealing element 100 and the forming tube 300, avoiding inaccurate filling volume or bag bulging caused by residual gas in the strip bag, and reducing and controlling the dosage error of each bag of oral liquid.

[0035] In the disinfection state, the moving frame lowers the filling tube 200 to a preset position, and the sealing component 100 moves down accordingly. The lower end of the flexible skirt 120 inserts into the ventilation gap 400. Due to its trumpet-shaped structure and elastic deformation, it can tightly adhere to the inner wall of the molding tube 300, sealing the axial entrance of the ventilation gap 400 and forming a closed cleaning space. The disinfection process is as follows: Cleaning fluid, such as purified water, is introduced into the filling tube 200. The cleaning fluid flows downward along the inside of the filling tube 200, rinsing the inner wall of the filling tube 200 and then flowing out from the lower end. A hose can be installed below to receive the fluid. At the same time, cleaning fluid is introduced into the branch pipe 320 of the molding tube 300. The cleaning fluid enters the ventilation gap 400, rinsing the inner wall of the molding tube 300 and the outer wall of the filling tube 200, and then also flows out from the lower hose. Because the flexible skirt 120 seals the upper end of the ventilation gap 400, the cleaning fluid cannot overflow and can only be fully rinsed within the closed space to ensure no residue. After the cleaning fluid is discharged, high-temperature steam, such as 121°C saturated steam, is introduced into the branch pipe 320 of the filling pipe 200 and the forming pipe 300. The high temperature kills microorganisms. During the entire disinfection process, the elastic deformation of the flexible skirt 120 can compensate for the slight concentricity deviation between the filling pipe 200 and the forming pipe 300, ensuring a tight seal and no leakage of steam or cleaning fluid. At the same time, because the sealing component 100 and the filling pipe 200 move synchronously, there is no relative friction, which avoids the risk of leakage caused by the wear of the sealing ring in the traditional structure.

[0036] In some examples, such as Figure 3 As shown, the angle between the flexible skirt 120 and the axis of the flexible cylinder 110 is α, where 40°≤α≤45°, which is the tilt angle of the flexible skirt 120. During disinfection, the flexible skirt 120 needs to be inserted into the ventilation gap 400 between the filling tube 200 and the forming tube 300, and then conform to the inner wall of the forming tube 300 and the outer wall of the filling tube 200 through elastic deformation to form a closed space. If α<40°, the tilt angle of the flexible skirt 120 is small and its radial expansion capacity is weak, making it difficult to adapt to the small dimensional fluctuations of the ventilation gap 400, which may lead to local loose fit and leakage of cleaning fluid or vapor. If α>45°, the axial length of the flexible skirt 120 increases, and it is easy to produce wrinkles due to excessive compression when inserted into the ventilation gap 400, which will damage the continuity of the sealing surface. In addition, an excessively gentle angle will reduce the resilience of the skirt, making it difficult to fit tightly after deformation, which will also affect the sealing effect.

[0037] Secondly, during filling, the flexible skirt 120 and the upper end face of the forming tube 300 should be kept apart. If α is too large, it is necessary to control the distance between the lower part of the flexible skirt 120 and the upper part of the ventilation gap 400. It is necessary to avoid the lower part of the flexible skirt 120 not blocking the ventilation gap 400, but being close to the upper end of the ventilation gap 400. The outward expansion of the flexible skirt 120 may form an air blockage, affecting the gas overflow efficiency of the ventilation gap 400, resulting in a small amount of gas remaining in the strip.

[0038] Furthermore, such as Figure 3 As shown, two flexible skirts 120 are spaced apart along the axial direction of the flexible cylindrical portion 110. During disinfection, the two flexible skirts 120 can be inserted into the ventilation gap 400 in sequence. The lower flexible skirt 120 first contacts the inner wall of the forming tube 300, forming the first seal; the upper flexible skirt 120 continues to move down with the filling tube 200 and then contacts the inner wall of the forming tube 300, forming the second seal. If a single flexible skirt 120 has a sealing defect due to local wear, the other flexible skirt 120 can make up for the leakage, ensuring that the cleaning liquid or steam does not overflow. If the ventilation gap 400 has axial dimension fluctuations due to processing errors, the double skirts can cover a larger sealing range by fitting at different axial positions, avoiding sealing failure caused by excessive local gaps.

[0039] Furthermore, the positioning block 500 is fitted onto the outer periphery of the sealing member 100. The outer periphery of the sealing member 100 has an outwardly protruding insertion protrusion 130, and the inner wall of the positioning block 500 has a corresponding inwardly recessed insertion groove 510. The insertion protrusion 130 inserts into the insertion groove 510. This concave-convex structure achieves axial positioning of both, preventing relative axial slippage. As a preferred example, such as... Figure 3 and Figure 9 As shown, the insertion groove 510 is an annular groove, and the insertion protrusion 130 is an annular protrusion. The annular structure ensures that the positioning block 500 and the sealing component 100 are subjected to symmetrical forces in the circumference, avoiding deformation of the sealing component 100 caused by local stress concentration. Figure 9 As shown, the positioning block 500 can be designed as two symmetrical half-blocks connected by bolts or other fasteners. Installation can be completed without disassembling the filling tube 200. When the sealing component 100 is worn and needs to be replaced, simply loosen the bolts to separate the two half-blocks, remove the old sealing component 100 and fit in the new one, reducing downtime for maintenance.

[0040] Furthermore, the positioning block 500 extends upward and surrounds the outer periphery of the filling tube 200, defining a through-hole 520 on this extended portion. The through-hole 520 is an axial through-hole opened on the upper part of the positioning block 500, located above the insertion groove 510. As an example, in this example, the inner diameter of the flexible cylinder 110 is equal to the outer diameter of the filling tube 200, and there is no pressure effect between them. Instead, the inner diameter of the through-hole 520 is slightly smaller than the outer diameter of the filling tube 200. When the two positioning blocks 500 are fastened to the sealing member, the positioning block 500 portion on the periphery of the through-hole 520 can slightly abut against the outer wall of the filling tube 200 through the tightness of the fasteners, so as to lock the axial position of the positioning block 500, the sealing member 100 and the filling tube 200.

[0041] like Figures 5-7As shown, on the other hand, this utility model also provides a filling tube assembly. A concentric ring 600 is integrally embedded in the ventilation gap 400 between the filling tube 200 and the forming tube 300. A plurality of inner protrusions 610 are arranged circumferentially on the inner wall of the concentric ring 600. In this example, the number of protrusions is 6, but it could also be 5 or 7, which is not limited here. The inner ends of the inner protrusions 610 contact the outer wall of the filling tube 200. A plurality of outer protrusions 630 are arranged circumferentially on the outer wall of the concentric ring 600, the number of which is the same as the inner protrusions 610, and their circumferential positions correspond one-to-one. The outer ends of the outer protrusions 630 contact the inner wall of the forming tube 300. Preferably, the thicknesses of the inner protrusions 610 and the outer protrusions 630 are equal, and the sum of the thicknesses of the inner protrusions 610, the outer protrusions 630, and the concentric ring 600 is the inner radius of the forming tube 300 minus the outer radius of the filling tube 200. The space between adjacent inner protrusions 610 forms a first vent 620, and the space between adjacent outer protrusions 630 forms a second vent 640. The first vent 620 and the second vent 640 together constitute a flow path for gas or liquid.

[0042] When the traditional venting gap 400 lacks a positioning structure, the filling tube 200 is prone to radial displacement due to lifting and swaying or installation errors, resulting in uneven sealing of the flexible skirt 120 or localized narrowing of the exhaust channel. In this example, the inner protrusion 610 uniformly supports the outer wall of the filling tube 200 circumferentially, limiting its radial displacement; the outer protrusion 630 simultaneously supports the inner wall of the forming tube 300 circumferentially, providing a fixed reference for the concentric ring 600 itself. This effectively controls the concentricity deviation between the filling tube 200 and the forming tube 300, and also ensures that the venting gap 400 has a consistent circumferential width, providing a stable channel for fluid flow.

[0043] Specifically, the gas inside the strip bag needs to be discharged through the ventilation gap 400. In the traditional case without the concentric ring 600, the gap may become locally narrow due to concentricity deviation, causing the gas to form vortices and flow obstruction at the narrow gap. However, the first ventilation port 620 and the second ventilation port 640 are circumferentially evenly distributed strip channels, allowing the gas to flow parallel along each channel and avoiding the generation of vortices. During disinfection, the cleaning liquid or steam needs to flow through the inner wall of the forming tube 300 and the outer wall of the filling tube 200. In the traditional case without the concentric ring 600, the fluid tends to short-circuit along the side with a wider gap, resulting in insufficient flow velocity on the narrow side and incomplete cleaning in some areas.

[0044] As a reference example, such as Figure 8 As shown, the inner protrusion 610 is in point contact with the outer wall of the filling tube 200, and the outer protrusion 630 is in point contact with the inner wall of the forming tube 300, so as to increase the exposed area of ​​the outer wall of the filling tube 200 and the inner wall of the forming tube 300, so that the cleaning liquid or steam can directly flush most of the tube wall area, reducing the basis for the adhesion of residual materials or microorganisms.

[0045] Furthermore, such as Figure 7As shown, the ratio of the circumferential angle between the inner protrusion 610 and the first vent 620 is 1.8≤N / Y≤2, and the ratio of the circumferential angle between the outer protrusion 630 and the second vent 640 is 1.8≤W / E≤2. Taking the inner protrusion 610 and the first vent 620 as an example, in this example, the circumferential angle N corresponding to the inner protrusion 610 is 1.8-2 times the circumferential angle Y corresponding to the first vent 620. For example, N=36°, Y=20°, ratio 1.8; or N=40°, Y=20°, ratio 2, so that the total proportion of the inner protrusion 610 on the circumference reaches 60%-67%, which is sufficient to provide uniform and continuous support force, effectively limit the shaking of the filling tube 200, and keep the concentricity deviation within 0.08mm. The principle of the outer protrusion 630 and the second vent 640 is the same. Furthermore, regarding the gas and liquid flow angles, when N / Y = 1.8-2, the single-group angle Y of the first vent 620 (e.g., 20°) is 1 / 1.8-1 / 2 of the angle N of the inner protrusion 610 (e.g., 36° or 40°). At this time, the local resistance coefficient of the gas flowing through the first vent 620 is controlled at 1.2-1.5. When N / Y = 3, the local resistance coefficient is 2.5, and the flow resistance is reduced by more than 40%. This allows the gas to rise parallel along each channel, avoiding gas stagnation in the strip bag due to excessive resistance. The gas residue rate in the strip bag is reduced to below 0.5%.

[0046] If the ratio of the circumferential angle between the inner protrusion 610 and the first vent 620 (N / Y) is greater than 2 (e.g., N=45°, Y=15°), the first vent 620 will be too small. While this enhances support, it will compress the fluid channel, increasing flow resistance. This causes approximately 15%-20% of the gas to swirl in the vortex zone and fail to escape quickly, resulting in a residual rate in the strip bag exceeding 1.5%. If N / Y is less than 1.8 (e.g., N=30°, Y=20°), insufficient support from the inner protrusion 610 will cause slight swaying at the lower end of the filling tube 200, leading to circumferential fluctuations in the actual width of the first vent 620 and unstable gas flow path, which will also induce local vortices. As a preferred example, the circumferential angles of the first vent 620 and the second vent 640 are consistent, ensuring that the circumferential flow deviation of the gas or liquid is ≤5%. This ensures that there is no localized gas retention in the strip bag during filling, reducing the residual rate from 1.2% to below 0.5%.

[0047] In some examples, the concentric ring 600 is an elastomer structure, such as engineering plastic, and has a through deformation port 650. The side of the concentric ring 600 is also provided with a snap-fit ​​protrusion 660, and the molding tube 300 has a snap-fit ​​interface 310 through it radially for snap-fitting of the snap-fit ​​protrusion 660. The snap-fit ​​protrusion 660 can be provided on the concentric ring 600 or on one of the outer protrusions 630. In this example, as a preferred embodiment, the snap-fit ​​protrusion 660 is provided on one of the outer protrusions 630. The outer protrusion 630 itself is a structure on the outer wall of the concentric ring 600 used to support the inner wall of the molding tube 300. By integrating the snap-fit ​​protrusion 660 on one of the outer protrusions 630, the snap-fit ​​function does not require an additional protrusion at the ring wall position corresponding to the second vent 640. The second vent 640 serves as a flow channel for gas, cleaning fluid, or steam, and the integrity and continuity of its circumferential distribution are not disrupted. Since the snap-fit ​​protrusion 660 does not occupy the second vent 640, cleaning fluid or steam can cover all areas of the second vent 640 on the outer wall of the concentric ring 600, further improving cleaning ability.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sealing component for a filling machine, characterized in that, The venting gap (400) between the interlocking filling tube (200) and forming tube (300) includes: The sealing element (100) includes a flexible cylindrical portion (110) and a flexible skirt (120) disposed on the outer periphery of the flexible cylindrical portion (110). The flexible cylindrical portion (110) is used to be sleeved on the filling tube (200). The flexible skirt (120) gradually increases in diameter from bottom to top and is used to seal the ventilation gap (400).

2. A sealing component for a filling machine according to claim 1, characterized in that, The angle between the flexible skirt (120) and the axis of the flexible cylindrical part (110) is α, where 40°≤α≤45°.

3. A sealing component for a filling machine according to claim 1, characterized in that, The flexible skirt (120) has two parts and is arranged at intervals along the axial direction of the flexible cylindrical part (110).

4. A sealing component for a filling machine according to claim 1, characterized in that, Also includes: Two positioning blocks (500) are provided, and the two positioning blocks (500) are clamped to the outer periphery of the sealing member (100) to lock the axial position of the sealing member (100) and the filling tube (200). The positioning blocks (500) have insertion grooves (510). The sealing member (100) has a plug-in protrusion (130) that engages with the plug-in groove (510) to allow the positioning block (500) and the sealing member (100) to be detachably connected.

5. A sealing component for a filling machine according to claim 4, characterized in that, The positioning block (500) extends upward and surrounds the outer periphery of the filling tube (200).

6. A filling tube assembly, characterized in that, The invention includes a sealing element for a filling machine as described in any one of claims 1-5, and a concentric ring (600) disposed within the venting gap (400), the concentric ring (600) being located at the lower end of the forming tube (300), the concentric ring (600) having a plurality of circumferentially spaced inner protrusions (610), the inner protrusions (610) being used to contact the outer wall of the filling tube (200), and a first vent (620) being formed between two adjacent inner protrusions (610).

7. A filling tube assembly according to claim 6, characterized in that, The concentric ring (600) also has a plurality of circumferentially spaced outward protrusions (630), which are used to contact the inner wall of the forming tube (300), and a second vent (640) is formed between two adjacent outward protrusions (630).

8. A filling tube assembly according to claim 7, characterized in that, The circumferential angle of the inner protrusion (610) is N, and the circumferential angle of the first vent (620) is Y, where 1.8≤N / Y≤2.

9. A filling tube assembly according to claim 7, characterized in that, The circumferential angle of the outer protrusion (630) is W, and the circumferential angle of the second vent (640) is E, where 1.8≤W / E≤2.

10. A filling tube assembly according to any one of claims 7-9, characterized in that, The concentric ring (600) is an elastic body structure and has an axially penetrating deformation port (650). The outer side of the outer protrusion (630) is also provided with a snap-fit ​​protrusion (660). The forming tube (300) is provided with a snap-fit ​​interface (310) that snaps into the snap-fit ​​protrusion (660).

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