Sealing structure and repeatedly sealed packaging bag

Abstract

The utility model relates to a sealing structure and a repeatedly sealed packaging bag, the sealing structure is used for repeatedly sealing a packaging bag body, the sealing structure comprises a bag mouth, a sealing mouth and a buckle, and the bag mouth is used as a leading-in and leading-out port of the packaging bag body; the sealing nozzle can be clamped into the bag nozzle, and a guide hole is formed in the sealing nozzle; the buckle is connected with the sealing nozzle and has elasticity; when the sealing mouth is not clamped into the bag mouth, the bag mouth is clamped by the buckle under the elastic effect, and the bag mouth is in a closed state. And when the sealing nozzle is clamped into the bag nozzle, the buckle is ejected open by the sealing nozzle, so that the bag nozzle is in an open state through the guide hole. According to the scheme, the packaging bag body can be opened or closed by inserting and pulling out the sealing nozzle; when the sealing mouth is inserted into the bag mouth, the buckle located in the bag mouth is ejected open through the sealing mouth, and the packaging bag body is opened through the guide hole. When the sealing nozzle is pulled out, the buckle returns to the position under the action of elastic force, so that the buckle is clamped into the bag nozzle, repeated sealing of the bag nozzle is achieved, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing packaging bags, and in particular to a sealing structure and a packaging bag that can be repeatedly sealed. Background Technology

[0002] There are generally three ways to package liquids:

[0003] (1) The dispensing tube is packaged separately and attached to the outside of the soft packaging bag. At the same time, an insertion hole for the dispensing tube is opened on the soft packaging bag and sealed with a film with a thickness less than that of the soft packaging bag. When dispensing the tube, the film in the insertion hole on the soft packaging bag needs to be pierced with the dispensing tube.

[0004] (2) Heat-seal the dispensing tube onto the soft packaging bag and seal it with a threaded cap. When taking out the product, unscrew the cap and pour it out through the dispensing tube.

[0005] (3) The dispensing tube is heat-fused onto the soft packaging bag, and then the dispensing tube is wrapped and sealed. When drinking, the sealed package is torn open to expose the dispensing tube for use.

[0006] However, the above three methods still have some problems: For the first method, since the bag and the dispensing tube are separate, the hygiene quality of the dispensing tube cannot be guaranteed; for the second method, the structure of the dispensing tube and the screw cap is relatively complicated, the manufacturing cost of the drinking tube and the cap is relatively high, the screw cap sealing action is relatively complicated, and it is not convenient for automatic liquid dispensing operation; for the third method, after the package seal is torn open, it cannot be resealed and can only be used up at one time.

[0007] Therefore, the problem of complex sealing methods, unfavorable for automatic dispensing, and inability to reseal when dispensing liquids from packaging bags also exists in solid packaging bags. Utility Model Content

[0008] Based on this, a sealing structure and a packaging bag for repeated sealing are provided to solve the problem in the prior art of lacking a packaging bag that can simultaneously achieve the dual effects of repeated sealing and simple liquid retrieval.

[0009] On the one hand, this utility model provides a sealing structure for repeatedly sealing the body of a packaging bag, the sealing structure comprising:

[0010] The bag spout serves as the inlet and outlet for the packaging bag body;

[0011] The sealing cap can be inserted into the bag opening, and a guide hole is provided on the sealing cap.

[0012] The buckle connects to the sealing nozzle and is flexible;

[0013] When the sealing cap is not inserted into the bag opening, the buckle holds the bag opening in place due to its elasticity, keeping the bag opening closed. When the sealing cap is inserted into the bag opening, the buckle is pushed open by the sealing cap, allowing the bag opening to pass through the guide hole and be in an open state.

[0014] Based on the above technical solution, the present invention can be further improved as follows.

[0015] In one implementation, the latch includes:

[0016] The snap-fit ​​groove engages with one end of the sealing nozzle.

[0017] A sealing part is provided adjacent to the snap-fit ​​groove;

[0018] The first seal surrounds the outer periphery of the sealing portion;

[0019] When the sealing nozzle is not inserted into the bag mouth, the sealing part is tightly fitted to the inner wall of the bag mouth through the first sealing element.

[0020] In one implementation, the latch also includes:

[0021] The first sealing groove is annular and is opened in the circumference of the sealing part, and the first sealing element is inserted into the first sealing groove.

[0022] The first sealing element is a sealing ring.

[0023] In one implementation, the latch also includes:

[0024] The limiting part is connected to the sealing part, and the outer diameter of the limiting part is larger than the inner diameter of the bag mouth;

[0025] The connecting part has one end connected to the side of the bag mouth located inside the packaging bag body, and the other end connected to the limiting part.

[0026] In one implementation, the connecting part is a spirally wound strip structure.

[0027] In one implementation, sealing the mouth includes:

[0028] The abutting end has a cross-section shaped like a frustum, with the end of the abutting end facing the latch being the smaller end of the frustum.

[0029] The transition section is connected to the abutment end, and the diameter of the transition section is smaller than the diameter of the large end of the frustum of the abutment end.

[0030] One end of the snap-fit ​​groove mates with the small frustum-shaped end of the abutment end, while the other end of the snap-fit ​​groove extends toward the transition section and snaps with the large frustum-shaped end of the abutment end.

[0031] In one of the implementation methods,

[0032] The guide hole includes:

[0033] The first guiding section is opened along the axial direction of the bag mouth;

[0034] The second guide section is connected to the first guide section and the second guide section, and the second guide section is opened along the radial direction of the bag mouth; when the sealing mouth is inserted into the bag mouth, the second guide section is located inside the packaging bag body.

[0035] In one implementation, there are at least two second conductive parts arranged symmetrically.

[0036] In one implementation, the sealing process also includes:

[0037] The second sealing groove is formed on the outer periphery of the sealing nozzle;

[0038] The second seal is inserted into the second sealing groove.

[0039] On the other hand, this utility model also provides a repeatedly sealed packaging bag, including a sealing structure and a packaging bag body.

[0040] The beneficial effects of this utility model are as follows: Because the sealing nozzle has a guide hole, after the sealing nozzle is inserted into the bag mouth and the buckle is released, the packaging bag body is in an open state through the guide hole, allowing the packaging bag body to be connected internally and externally. Because the buckle is elastic and can be inserted into the bag mouth under the action of elastic restoring force, after the sealing nozzle is removed, the buckle will automatically return to its original position and be inserted into the bag mouth under the action of elasticity, thereby sealing the opening of the bag mouth and achieving the sealing of the packaging bag body. In summary, this application allows the packaging bag body to be opened or closed simply by inserting and removing the sealing nozzle, making the operation simple. When the sealing nozzle is inserted into the bag mouth, the buckle located inside the bag mouth is released by the sealing nozzle, and the packaging bag body is opened through the guide hole in the middle of the sealing nozzle. When the sealing nozzle is pulled out, the buckle will automatically return to its position under the action of elasticity, thereby returning the buckle to the state of being inserted into the bag mouth and achieving the closure of the bag mouth. This achieves repeated sealing of the packaging bag body and is convenient to operate. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the bag opening structure in one embodiment when it is closed;

[0042] Figure 2 This is a schematic diagram of the sealing structure of the bag opening in one embodiment, viewed from another perspective when the bag opening is closed.

[0043] Figure 3 for Figure 2 Sectional view at point AA;

[0044] Figure 4 for Figure 2 A cross-sectional view from another direction;

[0045] Figure 5 This is a schematic diagram of the bag opening structure in one embodiment;

[0046] Figure 6 This is a structural schematic diagram of the sealing structure of a bag opening in one embodiment, viewed from another perspective.

[0047] Figure 7 for Figure 6 Sectional view at point BB.

[0048] In the attached diagram, the components represented by each number are as follows:

[0049] 10. Bag mouth;

[0050] 20. Sealing nozzle; 21. First conductive part; 22. Second conductive part; 23. Second sealing groove; 24. Second sealing element; 25. Abutting end; 26. Transition section;

[0051] 30. Buckle; 31. Snap-fit ​​groove; 32. Sealing part; 33. First sealing element; 34. First sealing groove; 35. Connecting part; 36. Limiting part. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the shape, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0054] A sealing structure, see Figure 1 and Figure 5This device is used for repeatedly sealing the packaging bag body. The sealing structure includes a bag mouth 10, a sealing tip 20, and a buckle 30. The bag mouth 10 serves as the inlet and outlet of the packaging bag body; the sealing tip 20 can be inserted into the bag mouth 10 and has a guide hole; the buckle 30 is connected to the sealing tip 20 and is elastic; see [reference needed] Figure 2 and Figure 3 When the sealing cap 20 is not engaged with the bag opening 10, the buckle 30, under its elastic force, holds the bag opening 10 in place, keeping the bag opening 10 closed; see also Figure 5 , Figure 6 and Figure 7 When the sealing nozzle 20 is inserted into the bag mouth 10, the buckle 30 is pushed open by the sealing nozzle 20, so that the bag mouth 10 is in the open state through the guide hole.

[0055] In this solution, which adopts the above-described approach, because the sealing nozzle 20 has a guide hole, after the sealing nozzle 20 is inserted into the bag mouth 10 and pushes open the buckle 30, the packaging bag body is in an open state through the guide hole, making the packaging bag body in a state of internal and external communication. Because the buckle 30 is elastic and can be inserted into the bag mouth 10 under the action of elastic restoring force, after the sealing nozzle 20 is removed, the buckle 30 will automatically return to its original position and be inserted into the bag mouth 10 under the action of elastic force, thereby sealing the opening of the bag mouth 10 and realizing the sealing of the packaging bag body. In summary, this application allows for the opening or closing of the packaging bag body simply by inserting and removing the sealing nozzle 20, making operation simple. When the sealing nozzle 20 is inserted into the bag opening 10, the buckle 30 located inside the bag opening 10 is opened by the sealing nozzle 20, and the packaging bag body is opened through the guide hole in the middle of the sealing nozzle 20. When the sealing nozzle 20 is pulled out, the buckle 30 will automatically return to its position under the action of elasticity, thereby returning the buckle 30 to the state of being locked into the bag opening 10, thus closing the bag opening 10. This achieves repeated sealing of the packaging bag body and is easy to operate.

[0056] Specifically, the packaging bag itself can contain either liquids or solids.

[0057] In this embodiment, the packaging bag body of this application is mainly a soft packaging bag. By inserting the sealing nozzle 20 to open the packaging bag body, the material inside the packaging bag body can be extracted or squeezed out.

[0058] In some embodiments, see Figure 3 and Figure 7The buckle 30 includes a snap-fit ​​groove 31, a sealing part 32, and a first sealing element 33. The snap-fit ​​groove 31 snaps into one end of the sealing nozzle 20. The sealing part 32 is disposed adjacent to the snap-fit ​​groove 31. The first sealing element 33 surrounds the outer periphery of the sealing part 32. When the sealing nozzle 20 is not snapped into the bag mouth 10, the sealing part 32 is tightly fitted to the inner wall of the bag mouth 10 through the first sealing element 33. In this way, by setting the snap-fit ​​groove 31, one end of the sealing nozzle 20 is snapped and fixed by the snap-fit ​​groove 31. When the sealing nozzle 20 pushes the buckle 30 out of the bag mouth 10, it is easy for the sealing nozzle 20 to snap into the snap-fit ​​groove 31. With the assistance of the snap-fit ​​30's restoring elasticity, it is also easy for the buckle 30 to be pulled out and brought back into the bag mouth 10, thus achieving a positioning effect for the buckle 30 to snap into the bag mouth 10. Since the radial diameter of the sealing part 32 is larger than the snap-fit ​​groove 31, the sealing nozzle 20 and the snap-fit ​​groove 31 can snap into each other in the bag mouth 10 before the sealing nozzle 20 pushes the snap-fit ​​groove 31 out of the bag mouth 10, thereby facilitating the snap-fit ​​positioning of the sealing nozzle 20 and the snap-fit ​​groove 31. By setting the sealing part 32 and the first sealing element 33, when the buckle 30 seals the bag mouth 10, the first sealing element 33 tightly fits the buckle 30 and the bag mouth 10, achieving a good sealing effect while also making it easy to push the buckle 30 to open the bag mouth 10 by the sealing nozzle 20.

[0059] In some embodiments, see Figure 3 and Figure 7 The snap fastener 30 also includes a first sealing groove 34, which is annular and located circumferentially on the sealing portion 32. A first sealing element 33 is inserted into the first sealing groove 34; the first sealing element 33 is a sealing ring. By making the first sealing groove 34 annular, it is easier to circumferentially tighten the first sealing element 33, ensuring that the first sealing element 33 remains firmly installed during the movement of the snap fastener 30. Using a sealing ring as the first sealing element 33 facilitates installation and improves cost control.

[0060] In some embodiments, see Figure 3 and Figure 7 The buckle 30 also includes a limiting part 36 and a connecting part 35. The limiting part 36 is connected to the sealing part 32, and the outer diameter of the limiting part 36 is larger than the inner diameter of the bag mouth 10. One end of the connecting part 35 is connected to the side of the bag mouth 10 located inside the packaging bag body, and the other end of the connecting part 35 is connected to the limiting part 36. In this way, the buckle 30 is provided with a connecting part 35 so that the position of the buckle 30 can be fixed, fixing the buckle 30 to the bag mouth 10 rather than to the soft packaging bag body, so that the installation position of the buckle 30 is sufficiently firm, and the buckle 30 can have a stable elastic recovery force after deformation, so that the buckle 30 can be re-clamped into the bag mouth 10 after the sealing part 20 is pulled out. The limiting part 36 is provided to avoid the problem of the buckle 30 being over-clamped into the bag mouth 10, so that the sealing part 20 can push the buckle 30 open.

[0061] In some embodiments, see Figure 3 and Figure 7 The connecting part 35 is a spirally wound strip structure. By making the connecting part 35 a spiral structure, it is easy for the connecting part 35 to accumulate axial restoring force when deformed, thereby facilitating the return of the buckle 30 to the snap-fit ​​state with the bag mouth 10, and also facilitating the repeated snap-fit ​​of the buckle 30 with the bag mouth 10.

[0062] In the embodiment, the connecting part 35 may also be configured as other structures arranged symmetrically along the axial direction to ensure that the buckle 30 can maintain a balanced force during the process of being pushed and moved by the sealing nozzle 20.

[0063] In some embodiments, see Figure 3 and Figure 7 The sealing end 20 includes an abutting end 25 and a transition section 26, both in the shape of a frustum. The end of the abutting end 25 facing the snap fastener 30 is the smaller end of the frustum. The transition section 26 is connected to the abutting end 25, and the diameter of the transition section 26 is smaller than the diameter of the larger end of the frustum of the abutting end 25. See also... Figure 3 and Figure 4 One end of the snap-fit ​​groove 31 engages with the small frustum-shaped end of the abutment end 25, and the other end of the snap-fit ​​groove 31 extends toward the transition section 26 and engages with the large frustum-shaped end of the abutment end 25. Thus, by setting the abutment end 25 to a frustum shape, when the abutment end 25 and the snap-fit ​​groove 31 form a snap-fit ​​structure, it is known that a corresponding snap-fit ​​groove is also formed within the snap-fit ​​groove 31. Furthermore, due to the existence of the transition section, it is convenient for one end of the snap-fit ​​groove to engage with the large frustum-shaped end of the abutment end, thereby preventing the abutment end 25 from dislodging after being inserted into the snap-fit ​​groove 31. This facilitates the abutment end 25 providing pulling force for the buckle 30 to return to the bag mouth 10 when the sealing nozzle 20 is pulled out. The snap-fit ​​groove 31 extends toward the abutment end with a fastening part, at least two of which are arranged circumferentially, thus ensuring that the buckle 30 and the sealing nozzle 20 form a uniform snap-fit ​​structure in the circumferential direction.

[0064] Specifically, the force that causes the abutting end 25 to disengage from the snap-fit ​​groove 31 is the first force, and the force that causes the second sealing groove 32 to snap into the inner wall of the bag mouth 10 is the second force. By adjusting the material and the gap, the first force can be made greater than the second force. As a result, during the process of pulling out the sealing end 20, the sealing end 20 will first assist in pulling the snap-fit ​​30 back into the bag mouth 10, and then the abutting end 25 of the sealing end 20 will disengage from the snap-fit ​​groove 31, thus ensuring the resealing effect of the snap-fit ​​30 on the bag mouth 10.

[0065] In this embodiment, the snap-fit ​​groove 31 has a trapezoidal structure with a smaller inner diameter and a larger outer diameter. The bottom of the trapezoidal structure is close to the outer side of the snap-fit ​​groove 31. The outer side of the snap-fit ​​groove 31 is provided with a reverse hook. The reverse hook makes it easy for the abutment end 25 to be inserted into the snap-fit ​​groove 31 and the two are not easy to fall out. This allows the sealing nozzle 20 to bring the buckle 30 back into the bag mouth 10 along the axial direction and seal it. This improves the stability of the sealing nozzle 20 when it is repeatedly inserted and removed, and ensures that the bag mouth 10 can be repeatedly opened and sealed.

[0066] In some embodiments, see Figure 2 , Figure 3 and Figure 7 The guide hole includes a first guiding portion 21 and a second guiding portion 22. The first guiding portion 21 is opened along the axial direction of the bag mouth 10. The first guiding portion 21 and the second guiding portion 22 are connected, and the second guiding portion 22 is opened along the radial direction of the bag mouth 10. When the sealing mouth 20 is engaged with the bag mouth 10, the second guiding portion 22 is located inside the packaging bag body. In this way, by setting the first guiding portion 21 and the second guiding portion 22, with the first guiding portion 21 arranged along the axial direction of the bag mouth 10 and the second guiding portion 22 arranged along the radial direction of the bag mouth 10, when one end of the sealing mouth 20 pushes open the buckle 30 and is engaged with the buckle 30, the inside and outside of the packaging bag body can be connected through the connected axial first guiding portion 21 and radial second guiding portion 22, forming an internal and external conductive structure.

[0067] In some embodiments, see Figure 3 and Figure 7 The second guiding section 22 has at least two parts and is arranged symmetrically. In this way, by setting multiple second guiding sections 22, the flow rate is guaranteed when the bag mouth 10 is open to the outside; the symmetrical arrangement of the second guiding sections 22 ensures that the sealing mouth 20 is kept under balanced force when it is introduced into and out of the packaging bag body.

[0068] In some embodiments, see Figure 3 and Figure 7 The sealing nozzle 20 also includes a second sealing groove 23 and a second sealing element 24. The second sealing groove 23 is formed on the outer periphery of the sealing nozzle 20; the second sealing element 24 is inserted into the second sealing groove 23. In this way, by forming a second sealing groove 23 on the outer periphery of the sealing nozzle 20 and placing a corresponding second sealing element 24 in the second sealing groove 23, the outer periphery of the sealing nozzle 20 and the inner wall of the bag mouth 10 can be kept sealed. When liquid is placed inside the packaging bag, this arrangement allows liquid inlet and outlet to both be through the first guide portion 21 formed in the middle of the sealing nozzle 20 and the radially formed second guide portion 22. This makes it convenient that when taking liquid from the packaging bag, there is only one outlet, the first guide portion 21. Therefore, when adopting quantitative automatic liquid dispensing, it is only necessary to clamp the corresponding liquid dispensing device to the other end of the sealing nozzle 20 to achieve a leak-proof liquid dispensing effect.

[0069] In this embodiment, the second sealing groove 23 and the second sealing member 24 can be located at one end near the second guide portion 22, thereby minimizing the amount of liquid entering between the bag mouth 10 and the sealing mouth 20.

[0070] A resealable packaging bag includes a sealing structure and a packaging bag body. Thus, the sealing structure on the packaging bag enables repeated sealing of the packaging bag body, and the sealing structure only requires axial insertion and removal, making operation simple and facilitating the design of automated dispensing devices.

[0071] See also in this application. Figure 3 and Figure 7 With the sealing structure of this application, the sealing nozzle 20 can be used to repeatedly open and close the bag mouth 10. During the process of the sealing nozzle 20 being inserted into the bag mouth 10, the sealing nozzle 20 will gradually push open the buckle 30 located in the bag mouth 10, and during the process of pushing open the buckle 30, the abutting end 25 will gradually engage with the engagement groove 31. The sealing nozzle 20 continues to advance until the second guiding part 22 is completely placed in the body of the packaging bag, thereby connecting the inside of the packaging bag body through the first guiding part 21 and the second guiding part 22, thus realizing the opening of the bag mouth 10. After the liquid or solid in the body of the packaging bag is taken out, the sealing nozzle 20 can be removed and the bag mouth 10 can be closed. During the process of removing the sealing nozzle 20, since the abutting end 25 engages with the engagement groove 31 and the buckle 30 has a certain elastic force, the buckle 30 will be moved together when the sealing nozzle 20 is removed, and the buckle 30 will re-enter the bag mouth 10, thereby achieving the sealing of the bag mouth 10 through the first sealing member 33 on the buckle 30. This solution allows for sealing and opening of the bag opening 10 simply by inserting or removing the sealing nozzle 20 axially. The operation is simple and facilitates the automated retrieval of solids or liquids from the packaging bag.

[0072] In the description of this utility model, it should be understood that the terms "center", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified; terms such as "installed," "connected," "joined," and "fixed" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral part; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements, unless otherwise explicitly specified.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A sealing structure, characterized in that, Used for repeatedly sealing the packaging bag body, the sealing structure includes: The bag mouth (10) serves as the inlet and outlet of the packaging bag body; A sealing nozzle (20) is provided, which can be inserted into the bag mouth (10), and a guide hole is provided on the sealing nozzle (20). A snap fastener (30) is connected to the sealing nozzle (20) and is elastic; When the sealing nozzle (20) is not inserted into the bag mouth (10), the buckle (30) holds the bag mouth (10) in place under elastic action, and the bag mouth (10) is in a closed state; when the sealing nozzle (20) is inserted into the bag mouth (10), the buckle (30) is pushed open by the sealing nozzle (20), and the bag mouth (10) is in an open state through the guide hole.

2. The sealing structure according to claim 1, characterized in that, The buckle (30) includes: A snap-fit ​​groove (31) is snapped into one end of the sealing nozzle (20); A sealing part (32) is disposed adjacent to the snap-fit ​​groove (31); A first seal (33) surrounds the outer periphery of the sealing portion (32); When the sealing nozzle (20) is not inserted into the bag mouth (10), the sealing part (32) is tightly fitted to the inner wall of the bag mouth (10) through the first sealing member (33).

3. The sealing structure according to claim 2, characterized in that, The buckle (30) also includes: The first sealing groove (34) is annular and is opened in the circumference of the sealing part (32), and the first sealing member (33) is inserted into the first sealing groove (34); The first sealing element (33) is a sealing ring.

4. The sealing structure according to claim 2, characterized in that, The buckle (30) also includes: A limiting part (36) is connected to the sealing part (32), and the outer diameter of the limiting part is larger than the inner diameter of the bag mouth (10); The connecting part (35) has one end connected to the side of the bag mouth (10) located inside the packaging bag body, and the other end connected to the limiting part (36).

5. The sealing structure according to claim 4, characterized in that, The connecting part (35) is a spirally wound strip structure.

6. The sealing structure according to claim 2, characterized in that, The sealing nozzle (20) includes: The abutting end (25) is frustum-shaped, and the end of the abutting end (25) facing the buckle (30) is the small end of the frustum; Transition section (26), the transition section (26) is connected to the abutment end (25), and the diameter of the transition section (26) is smaller than the diameter of the large end of the frustum of the abutment end (25); One end of the snap-fit ​​groove (31) engages with the frustum-shaped small end of the abutment end (25), and the other end of the snap-fit ​​groove (31) extends toward the transition section (26) and engages with the frustum-shaped large end of the abutment end (25).

7. The sealing structure according to claim 1, characterized in that, The guide hole includes: The first conductive part (21) is opened along the axial direction of the mouth (10); The second guide section (22) is connected to the first guide section (21) and the second guide section (22). The second guide section (22) is opened radially along the mouth of the bag (10). When the sealing mouth (20) is inserted into the mouth of the bag (10), the second guide section (22) is located inside the packaging bag body.

8. The sealing structure according to claim 7, characterized in that, The second conductive part (22) has at least two and is arranged symmetrically.

9. The sealing structure according to claim 1, characterized in that, The sealing nozzle (20) also includes: The second sealing groove (23) is formed on the outer periphery of the sealing nozzle (20); The second seal (24) is inserted into the second sealing groove (23).

10. A resealable packaging bag, characterized in that, It includes the sealing structure as described in any one of claims 1-9, and also includes the packaging bag body.

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