Ventilation structure and fermentation bag

Abstract

The application discloses a ventilation structure and a fermentation packaging bag and belongs to the technical field of packaging bags. The ventilation structure comprises a sleeve body, a cover body fixedly arranged on one side of the sleeve body, a first air hole formed in the top end of the cover body, a cavity formed in the cover body, a filter bag arranged in the sleeve body, a first filter membrane fixedly arranged on the inner side of the filter bag, and a first channel formed in the cover body and communicated with the first air hole and the cavity. The gas passing through the filter bag can reach the first air hole through the cavity and the first channel. According to the technical scheme, the filter bag is slidably arranged on the inner side of the sleeve body to drive the first filter membrane to move. When the part of the first filter membrane located on the outer side of the sleeve body is blocked, the pressure in the bag body pushes the filter bag to extend a part on the inner side of the sleeve body, so that the gas in the bag body can continuously be discharged through the first filter membrane.

Description

Technical Field

[0001] This application relates to the field of packaging bag technology, and more specifically, to ventilation structures and fermentation packaging bags. Background Technology

[0002] Fermentation packaging bags are plastic bags used for fermenting feed, composting, silage, etc. They have one-way exhaust valves or breathing membranes to ensure an anaerobic environment inside the packaging bag while releasing the gases produced during fermentation and preventing the bag from breaking.

[0003] In related technologies, to prevent the fermentation juice inside the packaging bag from clogging the venting membrane and preventing fermentation gas from escaping, for example, patent CN214731012U provides a fermentation vegetable venting packaging bag. The filter membrane in the waterproof and breathable device of this packaging bag allows gas and liquid to pass freely, while large particles such as solids in the fermented vegetables cannot pass through. This can block large solid particles and prevent them from depositing on the surface of the ePTFE composite membrane, causing damage and clogging to the ePTFE composite membrane. The second ePTFE composite membrane has a larger pore size than the first ePTFE composite membrane. The composite membranes with different pore sizes can effectively block the juice of the fermented vegetables, preventing it from flowing into the one-way venting device along with the gas. The top of the waterproof venting device is connected to the bottom of the one-way venting device, allowing gas to flow freely.

[0004] Although the existing technical solutions mentioned above can achieve the effect of filtering and blocking different particles and fermentation juice by setting up multiple filter membranes, the filter membrane used to filter fermentation juice needs to be breathable and prevent the fermentation liquid from passing through. As particles accumulate on the surface of the filter membrane, blockage will occur, causing the fermentation gas inside the packaging bag to be unable to be discharged in time. Summary of the Invention

[0005] The purpose of this application is to provide an air exchange structure and a fermentation packaging bag containing the air exchange result, which solves the technical problem that the filter membrane will become clogged when filtering fermentation juice, and achieves the technical effect of preventing filter membrane clogging and ensuring normal air exhaust of the packaging bag.

[0006] One aspect of the technical solution of this application provides a ventilation structure, comprising:

[0007] A sleeve is used to be set on one side of the packaging bag, with one end of the sleeve located inside the packaging bag and the other end of the sleeve extending to the outside of the packaging bag.

[0008] A cover is fixedly disposed on one side of the sleeve body. The top of the cover has a first air hole, and the inside of the cover has a cavity.

[0009] A filter bag is disposed within the sleeve, and a first filter membrane is fixedly disposed on the inner side of the filter bag;

[0010] The first channel is located inside the cover and is connected to the first air hole and the cavity. Gas passing through the filter bag can reach the first air hole through the cavity and the first channel.

[0011] Preferably, it also includes:

[0012] A breathable sheet is detachably mounted on the top of the cover, and a second air hole is provided on the side of the breathable sheet away from the cover. When the breathable sheet is mounted on the top of the cover, the first air hole and the second air hole are connected.

[0013] The second filter membrane is installed between the cover and the breathable sheet.

[0014] Preferably, the filter bag is a cylindrical flexible bag, and one end of the filter bag is open, with the open end of the filter bag fixedly disposed inside the sleeve.

[0015] A push rod is fixedly installed at the bottom end of the filter bag, and the push rod is disposed in the cavity.

[0016] A movable plate is fixedly installed at the other end of the push rod. The movable plate is slidably disposed in the cavity. When driven, the push rod can move toward the end away from the cover, so that the filter bag extends out of the sleeve.

[0017] Preferably, a second channel is also provided inside the cover body, and

[0018] One end of the second channel is connected to the top of the cavity;

[0019] The other end of the second channel is connected to the outside of the cover through a connecting hole.

[0020] Preferably, the movable plate is slidably disposed within the cavity via a sealing ring;

[0021] The second channel is connected to the cavity on the upper side of the movable plate, and the first channel is connected to the cavity on the lower side of the movable plate;

[0022] The pressure difference between the second channel and the first channel enables the moving plate to move within the cavity.

[0023] Preferably, a support ring is fixedly disposed on the inner side of the cover above the first channel, and the second filter membrane is disposed at the top of the support ring;

[0024] A gasket is provided at the top of the second filter membrane, and the gasket is located at the bottom of the air-permeable sheet;

[0025] The top of the cavity and the bottom of the air-permeable sheet are respectively provided with a support plate and a pressure plate to maintain the stability of the second filter membrane.

[0026] Another aspect of the technical solution of this application provides a fermentation packaging bag, including the aforementioned ventilation structure, and further including:

[0027] Bag body;

[0028] The bag opening is located on one side of the bag body. One end of the bag opening is sealed with a connecting sleeve. The sleeve can be sealed with the connecting sleeve, and one end of the sleeve is located inside the bag body, while the other end of the sleeve extends out of the bag body.

[0029] Preferably, the bottom end of the sleeve is threaded, and the connecting sleeve is correspondingly provided with an internal thread, and the sleeve and the connecting sleeve are connected by the thread;

[0030] A second cut is provided on one side of the sleeve, and a first cut is provided inside the connecting sleeve corresponding to the second cut. When the sleeve is threaded into the connecting sleeve, the first cut and the second cut form a third channel.

[0031] One end of the third channel can communicate with the top of the cavity, and the bottom end of the third channel extends into the bag body.

[0032] Preferably, a first marking line is provided on one side of the sleeve body, and a second marking line is provided on one side of the connecting sleeve. When rotated to the point where the first marking line and the second marking line are aligned, the first cut and the second cut form a third channel.

[0033] As an optional solution to the technical solution in this application, the pore size of the first filter membrane is in the range of 1 micrometer to 10 micrometers and is made of PTFE material, while the filter bag is made of silicone material.

[0034] As an optional solution to the technical solution of this application, the outer side of the cover is provided with a storage groove for storing the sealing component, the sealing component is used to seal the bag opening, and a sealing strip is fixedly provided on the outer side of the bag opening;

[0035] The sealing assembly includes an arc-shaped clamp that cooperates with the storage groove. The inner side of the arc-shaped clamp has a clamping groove, and the inner side of the clamping groove has a limiting groove corresponding to the sealing strip.

[0036] As an optional solution to the technical solution of this application, a magnet is fixedly provided on the outer side of the arc-shaped clip, the magnet is embedded in the inner side of the storage groove, and an iron sheet is fixedly provided on the inner side of the storage groove corresponding to the magnet.

[0037] As an optional solution to the technical solution of this application, a perforation is provided on the inner side of the bag opening above the sealing strip, a reinforcing piece is fixedly provided on the outer side of the bag opening corresponding to the perforation, and a clamping assembly for clamping the reinforcing piece is rotatably provided on the outer side of the connecting sleeve.

[0038] As an optional solution to the technical solution of this application, the clamping assembly includes clamp A and clamp B, which are located on both sides of the bag opening. A rotating ring is fixedly provided at one end of each of the clamps A and B. The rotating ring is rotatably disposed on the outside of the connecting sleeve. A sliding groove is provided on the outside of the connecting sleeve corresponding to the rotating ring. The clamps A and B are interlocked.

[0039] As an optional solution of the technical solution in this application, the inner side of the clamping plate A is provided with an insertion hole corresponding to the through hole, and the side of the clamping plate B close to the clamping plate A is fixedly provided with a pin corresponding to the through hole. The other end of the pin is fixedly provided with a locking block, and the pin is engaged with the insertion hole by the locking block.

[0040] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0041] (1) In this application, the filter bag is slidably set inside the casing to drive the first filter membrane to move. When the part of the first filter membrane located outside the casing is blocked, the pressure inside the bag pushes the filter bag to extend a part inside the casing to ensure that the gas inside the bag continues to be discharged through the first filter membrane. This solves the problem of the filter membrane being blocked when filtering fermented juice, and thus realizes that when the first filter membrane is partially blocked, the first filter membrane can continue to be compensated to ensure the air permeability of the bag.

[0042] (2) This application provides a cavity and a first channel inside the cover body. The two ends of the first channel are connected to the cavity and the air permeable sheet, respectively. When the fermentation gas enters the cavity through the first filter membrane, it is smoothly discharged to the outside through the first channel and the air permeable sheet, thus ensuring the air permeability of the bag body.

[0043] (3) This application provides a second channel inside the cover, with one end of the second channel communicating with the cavity and the other end communicating with the third channel through a connecting hole. When the first filter membrane is blocked, the pressure inside the bag can enter the cavity through the third channel and the second channel to push the moving plate to slide, so that the moving plate pushes the first filter membrane to automatically extend and exhaust air through the push rod. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of the fermentation packaging bag disclosed in the embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the exploded structure of the fermentation packaging bag disclosed in the embodiments of this application;

[0046] Figure 3 This is a schematic diagram of the structure of the bag opening in the fermentation packaging bag disclosed in the embodiments of this application;

[0047] Figure 4 for Figure 1 Enlarged structural diagram at point C;

[0048] Figure 5 This is a schematic diagram of the structure of the cover of the fermentation packaging bag disclosed in the embodiments of this application;

[0049] Figure 6 This is a schematic diagram of the exploded structure of the cover of the fermentation packaging bag disclosed in the embodiments of this application;

[0050] Figure 7 This is a schematic diagram of the main structure of the cover of the fermentation packaging bag disclosed in the embodiments of this application;

[0051] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure at point AA;

[0052] Figure 9 This is a bottom view of the cover of the fermentation packaging bag disclosed in the embodiments of this application;

[0053] Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure at point BB;

[0054] Figure 11 This is a schematic diagram of the sealing assembly in the fermentation packaging bag disclosed in the embodiments of this application;

[0055] Explanation of the numbers in the diagram: 1. Bag body; 11. Connecting sleeve; 111. Internal thread; 112. First cut; 113. Slide groove; 12. Sealing edge; 13. Bag opening; 14. Sealing strip; 15. Perforation; 16. Reinforcing plate; 17. Clamping plate A; 171. Insertion hole; 18. Clamping plate B; 181. Pin; 182. Locking block; 19. Rotating ring;

[0056] 2. Sleeve body; 21. Cover body; 22. Ventilation sheet; 221. Pressure plate; 23. Cavity; 231. Air outlet; 232. Air inlet; 24. First channel; 25. Connecting hole; 26. Second channel; 27. Second cut; 28. Support ring; 29. ​​Support plate; 210. Storage slot; 211. Iron sheet;

[0057] 3. Filter bag; 31. First filter membrane; 32. Push rod; 33. Moving plate;

[0058] 4. Second filter membrane; 41. Gasket;

[0059] 5. Sealing assembly; 51. Arc-shaped clamp; 52. Clamping groove; 53. Limiting groove; 54. Magnet. Detailed Implementation

[0060] The present application will be further described in detail below with reference to the accompanying drawings.

[0061] Reference Figure 1 , Figure 2 , Figure 5 , Figure 8 and Figure 10 This application discloses a fermentation packaging bag, including a bag body 1, a bag opening 13 on one side of the bag body 1, a sleeve 2 at one end of the bag body 1 located at the bag opening 13, a cover 21 fixedly provided at one end of the sleeve 2, and a breathable sheet 22 threadedly provided at the other end of the cover 21.

[0062] A filter bag 3 is slidably disposed inside the sleeve 2. A first filter membrane 31 is fixedly disposed inside the filter bag 3. A push rod 32 is fixedly disposed inside the filter bag 3. Movable plates 33 are fixedly disposed at both ends of the push rod 32. A cavity 23 and a first channel 24 are opened inside the cover 21. The cavity 23 is located at the center of the cover 21. The movable plate 33 is slidably disposed inside the cavity 23. The first channel 24 is located outside the cavity 23 and is used to connect the inside of the sleeve 2 with the breathable sheet 22. A connecting hole 25 is opened at the bottom of the cover 21. A second channel 26 is opened on the inside of the cover 21 corresponding to the connecting hole 25, which is used to connect the inside of the cavity 23 with the connecting hole 25. The connecting hole 25 is connected to the inside of the bag 1 through a third channel.

[0063] When fermentation gas is generated inside the bag body 1, the gas enters the interior of the sleeve body 2 through the first filter membrane 31, and then flows to the ventilated sheet 22 through the first channel 24 inside the cover body 21 to ensure normal exhaust of the bag body 1. At this time, the particles in the fermentation juice will gradually accumulate on the outside of the first filter membrane 31. When the first filter membrane 31 is completely blocked or the exhaust efficiency is low, the gas pressure inside the bag body 1 gradually increases. The gas will enter the interior of the second channel 26 through the third channel, and finally enter the interior of the cavity 23 to gradually increase the pressure. Under the action of pressure, the moving plate 33 inside the cavity 23 pushes the push rod 32 to drive the filter bag 3 to extend part of its length into the bag body 1. At this time, the bag body 1 continues to be vented through the extended part to prevent the normal exhaust of the bag body 1 from being affected when the first filter membrane 31 is blocked.

[0064] Reference Figure 1 and Figure 2 The bag body 1 is sealed with a connecting sleeve 11 at one end of the bag opening 13. The connecting sleeve 11 has a threaded sleeve body 2 inside. The other sides of the bag body 1 are provided with sealing edges 12.

[0065] The bag body 1 and the cover 21 are detachably connected by the connecting sleeve 11 and the sleeve body 2, so that the air inside the bag body 1 can be vented after the cover 21 is removed, and the bag can be reused easily by replacing the corresponding parts.

[0066] Reference Figure 6 , Figure 8 and Figure 10 The first filter membrane 31 has a pore size range of 1 micrometer to 10 micrometers and is made of PTFE material, while the filter bag 3 is made of silicone material.

[0067] The silicone filter bag 3 slides inside the sleeve 2, ensuring the seal between the sleeve 2 and the filter bag 3, preventing the fermentation juice inside the bag 1 from entering the sleeve 2 and the cavity 23. At the same time, the first filter membrane 31 inside the filter bag 3 ensures that the gas inside the bag 1 can be discharged.

[0068] Reference Figure 6 and Figure 8 An air vent 231 is provided between the cavity 23 and the bottom of the first channel 24. A support ring 28 is fixedly provided on the inner side of the cover 21 above the first channel 24. A second filter membrane 4 is provided on the top of the support ring 28. A gasket 41 is provided on the top of the second filter membrane 4. The gasket 41 is located at the bottom of the air permeable sheet 22. A support plate 29 and a pressure plate 221 are fixedly provided on the top of the cavity 23 and the bottom of the air permeable sheet 22, respectively, to maintain the stability of the second filter membrane 4.

[0069] When the gas inside the bag 1 enters the cavity 23 through the first filter membrane 31, it then enters the first channel 24 through the air outlet 231, and is then discharged through the second filter membrane 4 at the top of the support ring 28. The second filter membrane 4 further protects the breathable sheet 22, effectively preventing external moisture from entering the interior of the cover 21 through the breathable sheet 22.

[0070] Reference Figure 3 , Figure 5 Figure 8 , Figure 9 and Figure 10 An air inlet 232 is provided between the cavity 23 and one end of the second channel 26. The air inlet 232 is located on the top of the movable plate 33. The other end of the second channel 26 is connected to the third channel through the connecting hole 25.

[0071] The third channel includes a first cut 112 on the inner side of the connecting sleeve 11 and a second cut 27 on the outer side of the sleeve body 2. The first cut 112 and the second cut 27 cooperate with each other. The inner side of the connecting sleeve 11 is provided with an internal thread 111 that cooperates with the sleeve body 2.

[0072] After the sleeve 2 and the connecting sleeve 11 are threaded together, the first cut 112 on the inner side of the connecting sleeve 11 and the second cut 27 on the outer side of the sleeve 2 are aligned to form a third channel. At this time, one end of the third channel is located at the bottom of the sleeve 2 and communicates with the inside of the bag 1, and the other end is aligned with the connecting hole 25. Thus, after the cover 21 is installed, the cavity 23 can communicate with the inside of the bag 1 through the second channel 26 and the third channel.

[0073] In some technical solutions, a first marking line (not shown in the figure) is provided on one side of the sleeve 2, and a second marking line (not shown in the figure) is provided on one side of the connecting sleeve 11. When rotated to the point where the first marking line and the second marking line are aligned, the first cut 112 and the second cut 27 form a third channel.

[0074] Reference Figure 3 , Figure 5 and Figure 11 The outer side of the cover 21 is provided with a storage groove 210 for storing the sealing component 5. The sealing component 5 is used to seal the bag opening 13. A sealing strip 14 is fixedly provided on the outer side of the bag opening 13.

[0075] The sealing assembly 5 includes an arc-shaped clip 51 that cooperates with the storage groove 210. The inner side of the arc-shaped clip 51 is provided with a clamping groove 52, and the inner side of the clamping groove 52 is provided with a limiting groove 53 corresponding to the sealing strip 14.

[0076] When sealing the bag opening 13, the sealing component 5 inside the storage slot 210 is taken out, so that the clamping groove 52 on the inner side of the arc-shaped clamp 51 is located on both sides of the bag opening 13, and the sealing strip 14 on the outer side of the bag opening 13 is pressed into the inner side of the limiting groove 53. Then, the arc-shaped clamp 51 is moved along the bag opening 13 so that the sealing strip 14 on the inner side of the limiting groove 53 interlocks and seals. The interlocking and sealing of the sealing strip 14 is existing technology and will not be described in detail here. After sealing, the sealing component 5 is put into the storage slot 210 for easy access.

[0077] Reference Figure 5 and Figure 11 A magnet 54 is fixedly installed on the outside of the arc-shaped clip 51. The magnet 54 is embedded in the inside of the storage slot 210. An iron sheet 211 is fixedly installed on the inside of the storage slot 210 corresponding to the magnet 54.

[0078] When the arc-shaped clip 51 is placed, the magnet 54 and the iron sheet 211 attract each other to ensure the stability of the sealing component 5 inside the storage slot 210, prevent the sealing component 5 from falling off during movement, and save time and make it convenient to take out.

[0079] Reference Figure 2 , Figure 3 and Figure 4A perforation 15 is provided on the inner side of the bag opening 13 above the sealing strip 14. A reinforcing piece 16 is fixedly provided on the outer side of the bag opening 13 corresponding to the perforation 15. A clamping assembly for clamping the reinforcing piece 16 is rotatably provided on the outer side of the connecting sleeve 11.

[0080] The reinforcement plate 16 is fixedly installed on the outside of the bag opening 13 to reinforce it. After the sealing strip 14 is sealed, the reinforcement plate 16 is clamped by the clamping assembly to prevent the sealing strip 14 from being pushed open by the pressure inside the bag body 1. The reinforcement plate 16 also prevents the bag opening 13 from being pinched and damaged.

[0081] Reference Figure 2 and Figure 3 The clamping assembly includes clamping plate A17 and clamping plate B18, which are located on both sides of the bag opening 13. A rotating ring 19 is fixedly provided at one end of clamping plate A17 and clamping plate B18. The rotating ring 19 is rotatably disposed on the outside of the connecting sleeve 11. A sliding groove 113 is provided on the outside of the connecting sleeve 11 corresponding to the rotating ring 19. Clamping plate A17 and clamping plate B18 are interlocked.

[0082] After the bag opening 13 is sealed by the sealing strip 14, rotate the clamps A17 and B18 on the outside of the connecting sleeve 11 to be located on both sides of the bag opening 13. Press the clamps A17 and B18 to fasten them together. At this time, the clamps A17 and B18 are clamped on the outside of the reinforcing piece 16, and the bag opening 13 is in a clamped state, which ensures the stability of the bag opening 13 sealing.

[0083] Reference Figure 2 and Figure 3 The inner side of the clamping plate A17 is provided with an insertion hole 171 corresponding to the through hole 15. The side of the clamping plate B18 near the clamping plate A17 is fixedly provided with a pin 181 corresponding to the through hole 15. The other end of the pin 181 is fixedly provided with a locking block 182. The pin 181 is engaged with the locking block 182 and is located inside the insertion hole 171.

[0084] When clips A17 and B18 are located on both sides of the bag opening 13, the pin 181 on one side of clip B18 passes through the through hole 15 and is inserted into the inside of the insertion hole 171. When the locking block 182 at one end of the pin 181 is located outside the insertion hole 171, it automatically locks into the outside of clip A17, so that clips A17 and clips B18 can be fastened together. When disassembling clips A17 and clips B18, the locking block 182 can be pushed into the insertion hole 171.

[0085] In summary, when using the fermentation packaging bag disclosed in this application embodiment, the fermented material and fermentation juice are placed inside the bag body 1, the residue on the bag opening 13 is wiped off, the sealing component 5 inside the storage groove 210 is taken out, the clamping groove 52 on the inner side of the arc-shaped clamp 51 is positioned on both sides of the bag opening 13, and the sealing strip 14 on the outer side of the bag opening 13 is pressed into the inner side of the limiting groove 53. Then, the arc-shaped clamp 51 is moved along the bag opening 13 so that the sealing strip 14 on the inner side of the limiting groove 53 interlocks and seals. After sealing, the sealing component 5 is placed inside the storage groove 210 for storage. The stability of the sealing component 5 inside the storage groove 210 is ensured by the mutual attraction between the magnet 54 and the iron sheet 211, preventing the sealing component 5 from falling off during movement.

[0086] Then rotate the clamps A17 and B18 on the outside of the connecting sleeve 11 to the sides of the bag opening 13, so that the pin 181 on one side of the clamp B18 passes through the through hole 15 and is inserted into the inside of the insertion hole 171. When the locking block 182 at one end of the pin 181 is outside the insertion hole 171, it automatically locks into the outside of the clamp A17, so that the clamps A17 and B18 can be fastened together. At this time, the clamps A17 and B18 are clamped on the outside of the reinforcing piece 16, and the bag opening 13 is clamped, which ensures the stability of the bag opening 13. The reinforcing piece 16 is fixedly set on the outside of the bag opening 13 to reinforce it. At the same time, the reinforcing piece 16 protects the bag opening 13 from being pinched and damaged.

[0087] Unscrew the sleeve 2 to open the connecting sleeve 11. Excess air inside the bag 1 is expelled by squeezing it. Then, the sleeve 2 is threaded back onto the connecting sleeve 11. The first cut 112 on the inner side of the connecting sleeve 11 and the second cut 27 on the outer side of the sleeve 2 are aligned to form a third channel. At this time, one end of the third channel is located at the bottom of the sleeve 2 and communicates with the inside of the bag 1, and the other end is aligned with the connecting hole 25. When fermentation gas is generated inside the bag 1, the gas enters the interior of the sleeve 2 through the first filter membrane 31, and then flows through the first channel 24 inside the cover 21 to the vent 22 for discharge, thus ensuring... When the bag body 1 is properly venting air, particles in the fermented juice will gradually accumulate on the outside of the first filter membrane 31. When the first filter membrane 31 is completely blocked or the venting efficiency is low, the air pressure inside the bag body 1 will gradually increase. The gas will enter the interior of the second channel 26 through the third channel and eventually enter the interior of the cavity 23, gradually increasing the pressure. Under the action of pressure, the moving plate 33 inside the cavity 23 pushes the push rod 32 to drive the filter bag 3 to extend a part into the bag body 1. At this time, the bag body 1 will continue to be vented through the extended part to prevent the normal venting of the bag body 1 from being affected when the first filter membrane 31 is blocked.

[0088] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this application.

Claims

1. A ventilation structure, characterized in that, Include: A sleeve is used to be set on one side of the packaging bag, with one end of the sleeve located inside the packaging bag and the other end of the sleeve extending to the outside of the packaging bag. A cover is fixedly disposed on one side of the sleeve body. The top of the cover has a first air hole, and the inside of the cover has a cavity. A filter bag is disposed within the sleeve, and a first filter membrane is fixedly disposed on the inner side of the filter bag; The first channel is opened inside the cover and is connected to the first air hole and the cavity respectively. The gas passing through the filter bag can reach the first air hole through the cavity and the first channel. A breathable sheet is detachably mounted on the top of the cover, and a second air hole is provided on the side of the breathable sheet away from the cover. When the breathable sheet is mounted on the top of the cover, the first air hole and the second air hole are connected. The second filter membrane is installed between the cover and the breathable sheet; The filter bag is a cylindrical flexible bag with one end open, and the open end of the filter bag is fixedly disposed inside the sleeve. A push rod is fixedly disposed at the bottom end of the filter bag, and the push rod is disposed in the cavity. A movable plate is fixedly disposed at the other end of the push rod, and the movable plate is slidably disposed in the cavity. When driven, the movable plate can move the push rod toward the end away from the cover, so that the filter bag extends out of the sleeve.

2. The ventilation structure according to claim 1, characterized in that, The cover body also has a second channel, and One end of the second channel is connected to the top of the cavity; The other end of the second channel is connected to the outside of the cover through a connecting hole.

3. The ventilation structure according to claim 2, characterized in that, The movable plate is slidably disposed within the cavity via a sealing ring; The second channel is connected to the cavity on the upper side of the movable plate, and the first channel is connected to the cavity on the lower side of the movable plate; The pressure difference between the second channel and the first channel enables the moving plate to move within the cavity.

4. The ventilation structure according to claim 1, characterized in that, A support ring is fixedly provided on the inner side of the cover above the first channel, and the second filter membrane is disposed at the top of the support ring; A gasket is provided at the top of the second filter membrane, and the gasket is located at the bottom of the air-permeable sheet; The top of the cavity and the bottom of the air-permeable sheet are respectively provided with a support plate and a pressure plate to maintain the stability of the second filter membrane.

5. A fermentation packaging bag, comprising the ventilation structure as described in any one of claims 1-4, characterized in that, Also includes: Bag body; The bag opening is located on one side of the bag body. One end of the bag opening is sealed with a connecting sleeve. The sleeve can be sealed with the connecting sleeve, and one end of the sleeve is located inside the bag body, while the other end of the sleeve extends out of the bag body.

6. The fermentation packaging bag according to claim 5, characterized in that, The bottom end of the sleeve is threaded, and the connecting sleeve is correspondingly provided with an internal thread. The sleeve and the connecting sleeve are connected by threads. A second cut is provided on one side of the sleeve, and a first cut is provided inside the connecting sleeve corresponding to the second cut. When the sleeve is threaded into the connecting sleeve, the first cut and the second cut form a third channel. One end of the third channel can communicate with the top of the cavity, and the bottom end of the third channel extends into the bag body.

7. The fermentation packaging bag according to claim 6, characterized in that, A first marking line is provided on one side of the sleeve body, and a second marking line is provided on one side of the connecting sleeve. When rotated to the point where the first marking line and the second marking line are aligned, the first cut and the second cut form a third channel.

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