A vacuum grain storage container

Abstract

This utility model discloses a vacuum grain storage bin, solving the technical problems of easily damaged sealing rings and leakage risks in existing vacuum grain storage bins. The vacuum grain storage bin proposed in this utility model includes a bin body, a lid, a vacuum assembly, and a first sealing ring. The bin body has a grain storage space and an opening communicating with the grain storage space. The lid has a cavity to accommodate the vacuum assembly. The first sealing ring is fitted onto the lid, creating a circumferential seal between the lid and the bin body when closed over the opening. The vacuum assembly is used to evacuate the grain storage space. The first sealing ring includes a first base ring and a first sealing lip ring formed by circumferentially extending the first base ring. The first base ring is located within the bin body. The first sealing lip ring is interference-fitted between the lid and the bin body. The first sealing lip ring extends outward from the bin body, and at least a portion of the first sealing lip ring gradually increases in thickness along the extension direction.

Description

Technical Field

[0001] This utility model relates to the field of grain storage containers, and in particular to a vacuum grain storage container. Background Technology

[0002] Vacuum grain storage containers can create a vacuum inside the container, offering advantages such as preservation, insect prevention, and moisture protection. A vacuum grain storage container consists of a container body and a lid, with a sealing ring between the lid and the container body for sealing.

[0003] However, during the vacuuming process, the lid of the vacuum grain storage container will move towards the container body due to the pressure difference between the pressure inside the container and the atmospheric pressure.

[0004] When using traditional O-rings for sealing, the movement of the bucket lid can cause the O-rings to wriggle along with the lid, which can easily lead to damage from wriggling. The wriggling of the O-rings may also impair the sealing effect, resulting in air leakage. Utility Model Content

[0005] This utility model proposes a vacuum grain storage bin to overcome the shortcomings of the prior art, thereby solving the technical problems of easily damaged sealing rings and the risk of air leakage in existing vacuum grain storage bins.

[0006] To achieve the above technical objectives, this utility model proposes a vacuum grain storage bin, comprising a bin body, a lid, a vacuum assembly, and a first sealing ring. The bin body has a grain storage space and an opening communicating with the grain storage space. The lid has a cavity to accommodate the vacuum assembly. The first sealing ring is sleeved on the lid, so that the lid, which is closed to the opening, and the bin body are circumferentially sealed. The vacuum assembly is used to evacuate the grain storage space. The first sealing ring includes a first base ring and a first sealing lip ring formed by circumferentially extending the first base ring. The first base ring is located in the bin body. The first sealing lip ring is interference-fitted between the lid and the bin body. The first sealing lip ring extends outward from the bin body, and at least a portion of the first sealing lip ring gradually increases in thickness in the extending direction.

[0007] The vacuum grain storage container of this invention features a first sealing lip ring that extends outward from the container body, with at least a portion of the first sealing lip ring gradually increasing in thickness along the extension direction. This first sealing lip ring restricts the continuous movement of the lid towards the container body, compressing the grain storage space. This allows the grain storage space to achieve a sufficient vacuum under the action of the vacuum assembly, ensuring the grain storage container has adequate preservation and insect-proof functions. Simultaneously, the first sealing lip ring elastically deforms with the movement of the lid. Because at least a portion of the first sealing lip ring gradually increases in thickness along the extension direction, the elastic deformation of at least a portion of the first sealing lip ring gradually increases in the extension direction. When the negative pressure in the grain storage space is released, this gradually increasing elastic deformation of the first sealing lip ring can push the lid to move away from the container body, allowing the user to open the lid more easily and reducing or avoiding situations where the first sealing ring gets stuck between the container body and the lid, making the lid difficult to open.

[0008] Preferably, a portion of the first sealing lip extends beyond the opening.

[0009] By adopting the aforementioned technical solution, dust can be prevented from entering the gap between the lid and the container, reducing the probability of dust falling into the grain storage space when the user opens and closes the lid, and reducing the probability of the stored grain in the vacuum grain storage container being contaminated.

[0010] Preferably, the thickness of the first sealing lip ring varies from thin to thick and then from thick to thin in the extension direction.

[0011] By adopting the aforementioned technical solution, the contact area between the elastically deformed first sealing lip ring and the barrel body can be reduced, and the friction between the first sealing lip ring and the barrel body can be reduced, which also reduces the difficulty of separating the first sealing lip ring from the barrel body. When the negative pressure state of the grain storage space is released, the elastic reset of the first sealing lip ring can more easily push the lid to move in the direction away from the barrel body, making it easier for users to open the lid and reducing or avoiding the situation where the first sealing ring gets stuck between the barrel body and the lid, making it difficult to open the lid.

[0012] Preferably, the cover has a first sealing groove on its side in the circumferential direction, and the first base ring is fitted into the first sealing groove.

[0013] By adopting the aforementioned technical solution, the movement of the first sealing ring relative to the cover body in the closing direction is restricted, thus preventing the first sealing ring from shifting relative to the cover body when the cover body is closed or opened.

[0014] Preferably, the cover includes an upper cover, a lower cover, and a trigger block. The upper cover and the lower cover form the cavity. The lower cover has a vent hole communicating with the grain storage space. The upper cover has an opening for the trigger block to move up and down. The trigger block has a first position for activating the vacuum assembly and a second position higher than the first position. The trigger block has a plug-in post that fits with the vent hole with a clearance. A second sealing ring is sleeved on the plug-in post. The second sealing ring includes a second base ring and a second sealing lip ring formed by the circumferential protrusion of the second base ring. The second sealing lip ring protrudes in a direction opposite to the plug-in post and is interference-fitted between the plug-in post and the vent hole. When the trigger block is in the first position, the plug is inserted into the vent hole and the vent hole is circumferentially sealed by the second sealing lip ring. When the trigger block is in the second position, the plug is disengaged from the vent hole, thus releasing the seal.

[0015] By adopting the aforementioned technical solution, the circumferential seal between the plug and the vent hole is achieved through the second sealing lip ring on the second sealing ring. This avoids the peristalsis of the second sealing ring caused by the movement of the plug relative to the vent hole, which is a problem with the use of traditional O-rings. This reduces the probability of the second sealing ring being damaged by peristalsis and the probability of air leakage caused by peristalsis.

[0016] Preferably, the plug post is provided with a second sealing groove, the second base ring is fitted into the second sealing groove, and the second base ring is located within the radial range of the plug post.

[0017] By adopting the aforementioned technical solution, a second sealing groove is provided circumferentially on the side of the plug-in post, which restricts the movement of the second sealing ring relative to the plug-in post in the insertion direction, thereby preventing the second sealing ring from displacing relative to the plug-in post during the movement of the trigger block; at the same time, the clearance fit between the second base ring and the vent hole prevents the second base ring from rubbing against the hole wall of the vent hole and generating resistance, thereby reducing the resistance during the insertion process of the plug-in post and the vent hole.

[0018] Preferably, the length of the second sealing lip ring extending beyond the radial range of the plug post is A, and the gap between the plug post and the adjacent hole wall of the vent hole is B, where 1.5≤A / B≤3.

[0019] By adopting the aforementioned technical solution, the protrusion height of the second sealing lip ring is set within a reasonable range, so that the second sealing lip ring can provide sufficient sealing effect between the plug post and the vent hole.

[0020] Preferably, the second sealing lip ring has multiple lip rings and is spaced apart along the axial direction of the second base ring.

[0021] By adopting the aforementioned technical solution, multiple second sealing lip rings are provided to ensure the circumferential seal between the plug and the vent hole, thus ensuring the reliability of the seal between the plug and the vent hole.

[0022] Preferably, the width of the second sealing lip ring gradually decreases in the convex direction.

[0023] By adopting the aforementioned technical solution, this design of the second sealing lip ring results in a roughly conical cross-section. The "tip" of the second sealing lip ring is more prone to elastic deformation, and the second sealing ring provides less resistance during the insertion of the insertion post and the vent hole. Secondly, when the storage space is under negative pressure relative to atmospheric pressure, the external air pressure acts on the second sealing lip ring, resulting in a greater thickness at the "root" of the second sealing lip ring, making it less prone to deformation. The pressure acting on the second sealing lip ring pushes the "tip" of the second sealing lip ring against the wall of the vent hole, resulting in a better sealing effect. Furthermore, the higher the external pressure, the greater the clamping force on the "tip" of the second sealing lip ring, thus ensuring that the second sealing ring maintains a good sealing effect over a wide pressure range.

[0024] Preferably, the trigger block is provided with a magnetic element, and the vacuum assembly includes a vacuum pump and a Hall unit. When the trigger block is in a first position, the magnetic element triggers the Hall unit, and when the trigger block is in a second position, the triggering is deactivated. The triggering of the Hall unit is used to start the vacuum pump.

[0025] By adopting the aforementioned technical solution, the vacuum pump is started through the cooperation of magnetic components and Hall units, avoiding the need to start the vacuum pump by physical pressing, thereby improving the service life of the vacuum pump triggering mechanism.

[0026] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a vacuum grain storage tank in an embodiment of this utility model; Figure 2 for Figure 1 A cross-sectional view of the trigger block in the first position in the medium vacuum grain storage tank; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 for Figure 1 A cross-sectional view of the trigger block in the second position in the medium vacuum grain storage tank (AA section). Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 This is a schematic diagram of the cover. Figure 8 This is a schematic diagram of the interior of the cover.

[0028] Figure label: 100. Barrel body; 101. Grain storage space; 102. Opening; 200, cover body; 210, upper cover; 220, lower cover; 221, first sealing groove; 230, trigger block; 231, plug-in post; 2311, second sealing groove; 232, magnetic element. 300. Vacuum assembly; 310. Vacuum pump; 320. Circuit board; 321. Hall effect unit; 330. Negative pressure switch; 400. First sealing ring; 410. First base ring; 420. First sealing lip ring; 500. Second sealing ring; 510. Second base ring; 520. Second sealing lip ring; 600, battery pack; 700. Self-locking mechanism; 710. Self-locking buckle; 720. Self-locking switch. Detailed Implementation

[0029] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0031] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more, unless otherwise expressly defined.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figures 1 to 3 , Figure 7 , Figure 8 As shown in the embodiment of this utility model, a vacuum grain storage bucket includes a bucket body 100, a lid 200, a vacuum assembly 300, and a first sealing ring 400. The bucket body 100 has a grain storage space 101 and an opening 102 communicating with the grain storage space 101. The lid 200 has a cavity to accommodate the vacuum assembly 300. The first sealing ring 400 is sleeved on the lid 200, so that the lid 200 covering the opening 102 and the bucket body 100 are circumferentially sealed. The vacuum assembly 300 is used to evacuate the grain storage space 101. The first sealing ring 400 includes a first base ring 410 and a first sealing lip ring 420 formed by the circumferential extension of the first base ring 410. The first base ring 410 is located in the bucket body 100. The first sealing lip ring 420 is interference-fitted between the lid 200 and the bucket body 100. The first sealing lip ring 420 extends outward from the bucket body 100 and at least part of the first sealing lip ring 420 gradually increases in thickness in the extension direction.

[0034] In this embodiment, the first sealing lip ring 420 is arranged in a ring shape with the first sealing ring 400 connected end to end in the circumferential direction.

[0035] The vacuum assembly 300 includes a vacuum pump 310, a circuit board 320, and a negative pressure switch 330. The vacuum pump 310 and the negative pressure switch 330 are connected to the grain storage space 101 via flexible hoses. The negative pressure switch 330 is mounted on the circuit board 320. The vacuum pump 310 is electrically connected to the circuit board 320. Upon receiving a vacuuming command, the circuit board 320 starts the vacuum pump 310. When the negative pressure in the grain storage space 101 reaches a predetermined value, the negative pressure switch 330 sends a corresponding control signal to the circuit board 320, thereby cutting off the current to the vacuum pump 310. The cover 200 also includes a battery pack 600, which powers the circuit board 320 and the vacuum pump 310. The negative pressure switch 330 is mounted on the circuit board 320.

[0036] Vacuum food storage containers are typically used to store food such as grains, beans, and tubers. They can also be used to store pet food, such as cat food, dog food, and hamster food.

[0037] The lid 200 covers the barrel 100, and a circumferential seal is achieved between the lid 200 and the barrel 100 through the first sealing lip ring 420. After the vacuum assembly 300 starts working, the air pressure in the grain storage space 101 is in a negative pressure state relative to the external atmospheric pressure. When the vacuum grain storage barrel needs to be opened, the negative pressure state of the grain storage space 101 is released by connecting it to the outside atmosphere, so that the user can open the lid 200 to take grain from the grain storage space 101. The lid 200 is provided with a connecting hole that connects to the outside, through which air in the cavity can flow to the outside atmosphere.

[0038] Because the first sealing lip ring 420 extends outward from the barrel body 100 and at least a portion of the first sealing lip ring 420 gradually increases in thickness in the extending direction, the first sealing lip ring 420 can restrict the lid 200 from continuously moving towards the barrel body 100 and compressing the grain storage space 101. This allows the grain storage space 101 to obtain a sufficient vacuum degree under the action of the vacuum component 300, ensuring that the grain storage barrel has sufficient preservation and insect prevention functions. At the same time, the first sealing lip ring 420 elastically deforms with the movement of the lid 200. Because at least a portion of the first sealing lip ring 420... The thickness gradually increases in the extension direction, so that the elastic deformation of at least part of the first sealing lip ring 420 gradually increases in the extension direction. When the negative pressure state of the grain storage space 101 is released, this gradually increasing elastic deformation of the first sealing lip ring 420 can push the cover 200 to move in the direction away from the barrel 100, so that the user can open the cover 200 more easily and reduce or avoid the situation where the first sealing ring 400 gets stuck between the barrel 100 and the cover 200, making it difficult to open the cover 200.

[0039] Based on the foregoing embodiments, such as Figure 3As shown, in this embodiment, a portion of the first sealing lip ring 420 extends out of the opening 102.

[0040] This design prevents dust from entering the gap between the lid 200 and the container 100, reducing the probability of dust falling into the grain storage space 101 when the user opens or closes the lid, and reducing the probability of the stored grain in the vacuum grain storage container being contaminated.

[0041] Based on all the aforementioned embodiments, such as Figure 3 As shown, in this embodiment, the thickness of the first sealing lip ring 420 changes from thin to thick and then from thick to thin in the extension direction.

[0042] When the thickest or relatively thickest part of the first sealing lip ring 420 elastically deforms, the thinner part in its extension direction will not elastically deform, and correspondingly, the thinner part will not come into contact with the barrel body 100. This reduces the contact area between the elastically deformed first sealing lip ring 420 and the barrel body 100, reducing the friction between them and thus lowering the difficulty of separating the first sealing lip ring 420 from the barrel body 100. When the negative pressure in the grain storage space 101 is released, the elastic reset of the first sealing lip ring 420 can more easily push the lid 200 to move away from the barrel body 100, making it easier for the user to open the lid 200 and reducing or avoiding situations where the first sealing ring 400 gets stuck between the barrel body 100 and the lid 200, making it difficult to open.

[0043] Based on all the aforementioned embodiments, such as Figure 3 As shown, in this embodiment, a first sealing groove 221 is provided on the circumferential side of the cover 200, and a first base ring 410 is fitted into the first sealing groove 221.

[0044] This design restricts the movement of the first sealing ring 400 relative to the cover 200 in the closing direction, preventing displacement of the first sealing ring 400 relative to the cover 200 when the cover 200 is closed or opened.

[0045] Based on all the aforementioned embodiments, such as Figure 2 , Figures 4 to 6As shown, in this embodiment, the cover 200 includes an upper cover 210, a lower cover 220, and a trigger block 230. A cavity is formed between the upper cover 210 and the lower cover 220. The lower cover 220 is provided with a vent hole that communicates with the grain storage space 101. The upper cover 210 is provided with an opening for the trigger block 230 to move up and down. The trigger block 230 has a first position for activating the vacuum assembly 300 and a second position higher than the first position. The trigger block 230 is provided with a plug-in post 231 that is clearance-fitted with the vent hole. A second sealing ring 500 is sleeved on the plug-in post 231. The second sealing ring 500 includes a second base ring 510 and a second sealing lip ring 520 formed by the circumferential protrusion of the second base ring 510. The second sealing lip ring 520 protrudes in a direction away from the plug-in post 231 and is interference-fitted between the plug-in post 231 and the vent hole. When the trigger block 230 is in the first position, the insertion post 231 is inserted into the vent hole and the vent hole is circumferentially sealed by the second sealing lip ring 520. When the trigger block 230 is in the second position, the insertion post 231 disengages from the vent hole, thus releasing the seal.

[0046] In this embodiment, the user triggers the trigger block 230 to the first position, sealing the grain storage space 101. The vacuum component 300 is activated, creating a negative pressure state in the grain storage space 101 relative to the outside atmosphere. The user then triggers the trigger block 230 to the second position, allowing the grain storage space 101 to communicate with the cavity of the cover 200 through a vent hole. Outside air can enter the cavity through the communication hole in the cover 200, connecting the grain storage space 101 with the outside atmosphere. The pressure in the grain storage space 101 becomes the same as the atmospheric pressure, thus releasing the negative pressure state of the grain storage space 101.

[0047] The trigger block 230 and the cover 200 are connected by a self-locking mechanism 700 and a spring, which allows the trigger block 230 to switch between a first position and a second position and to self-lock by pressing. The self-locking mechanism 700 includes a self-locking buckle 710 on the trigger block 230 and a self-locking switch 720 in the cover 200. For the specific structure of the self-locking mechanism 700, please refer to Chinese Utility Model Patent Publication No. CN220823723U, entitled "A Grain Storage Bucket".

[0048] In this embodiment, the second sealing lip ring 520 is arranged in a ring shape with the ends connected in the circumferential direction of the second sealing ring 500.

[0049] The second sealing lip ring 520 on the second sealing ring 500 achieves circumferential sealing between the plug post 231 and the vent hole, avoiding the peristalsis of the second sealing ring 500 caused by the movement of the plug post 231 relative to the vent hole due to the use of traditional O-rings. This reduces the probability of the second sealing ring 500 being damaged by peristalsis and the probability of air leakage caused by peristalsis.

[0050] In this preferred embodiment, such as Figure 4 , Figure 6 As shown, the trigger block 230 is provided with a magnetic element 232, and the vacuum assembly 300 includes a Hall unit 321. When the trigger block 230 is in the first position, the magnetic element 232 triggers the Hall unit 321, and when the trigger block 230 is in the second position, the triggering is deactivated. The triggering of the Hall unit 321 is used to start the vacuum pump 310.

[0051] The vacuum pump 310 is started by the cooperation of the magnetic element 232 and the Hall unit 321, avoiding the need to start the vacuum pump 310 by physical pressing, thereby improving the service life of the vacuum pump 310 triggering mechanism.

[0052] In another preferred embodiment, such as Figure 4 , Figure 6 As shown, the second sealing lip ring 520 has multiple lip rings and is spaced apart along the axial direction of the second base ring 510.

[0053] In this way, multiple second sealing lip rings 520 are provided, which provides multiple guarantees for the circumferential seal between the plug post 231 and the vent hole, ensuring the reliability of the seal between the plug post 231 and the vent hole.

[0054] In another preferred embodiment, such as Figure 4 , Figure 6 As shown, the width of the cross-section of the second sealing lip ring 520 gradually decreases in the convex direction.

[0055] This design of the second sealing lip ring 520 results in a roughly conical cross-section, making the "tip" of the second sealing lip ring 520 more prone to elastic deformation. This reduces the resistance provided by the second sealing ring 500 during the insertion of the insertion post 231 into the vent hole. Secondly, when the grain storage space 101 is under negative pressure relative to atmospheric pressure, the external air pressure acts on the second sealing lip ring 520, resulting in a thicker "root" that is less prone to deformation. The pressure acting on the second sealing lip ring 520 pushes the "tip" of the second sealing lip ring 520 against the vent hole wall, thus improving the sealing effect of the second sealing ring 500. Furthermore, the higher the external pressure, the greater the clamping force on the "tip" of the second sealing lip ring 520, allowing the second sealing ring 500 to maintain a good sealing effect over a wide pressure range.

[0056] In another preferred embodiment, such as Figure 4 , Figure 6 As shown, the side of the plug post 231 is provided with a second sealing groove 2311, and the second base ring 510 is fitted into the second sealing groove 2311. The second base ring 510 is in clearance fit with the vent hole.

[0057] By providing a second sealing groove 2311 circumferentially on the side of the plug-in post 231, the movement of the second sealing ring 500 relative to the plug-in post 231 in the insertion direction is restricted, thereby preventing the second sealing ring 500 from being displaced relative to the plug-in post 231 during the movement of the trigger block 230; at the same time, the clearance fit between the second base ring 510 and the vent hole prevents the second base ring 510 from rubbing against the hole wall of the vent hole and generating resistance, thereby reducing the resistance during the insertion process of the plug-in post 231 and the vent hole.

[0058] More preferably, such as Figure 4 , Figure 6 As shown, the length of the second sealing lip ring 520 extending beyond the radial range of the insertion post 231 is A, and the gap between the insertion post 231 and the adjacent hole wall of the vent hole is B, 1.5≤A / B≤3.

[0059] The protrusion height of the second sealing lip ring 520 is set within a reasonable range so that the second sealing lip ring 520 can provide sufficient sealing effect between the plug post 231 and the vent hole.

[0060] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A vacuum grain storage container, comprising a container body, a lid, a vacuum assembly, and a first sealing ring, wherein the container body has a grain storage space and an opening communicating with the grain storage space, the lid has a cavity for accommodating the vacuum assembly, and the first sealing ring is sleeved on the lid to achieve a circumferential seal between the lid, which is closed over the opening, and the container body, and the vacuum assembly is used to evacuate the grain storage space, characterized in that... The first sealing ring includes a first base ring and a first sealing lip ring formed by extending the first base ring circumferentially. The first base ring is located in the barrel body, and the first sealing lip ring is interference-fitted between the cover and the barrel body. The first sealing lip ring extends outward from the barrel body, and at least a portion of the first sealing lip ring gradually increases in thickness in the extending direction.

2. The vacuum grain storage bin as described in claim 1, characterized in that, Part of the first sealing lip ring extends out of the opening.

3. A vacuum grain storage bin as described in claim 1, characterized in that, The thickness of the first sealing lip ring changes from thin to thick and then from thick to thin in the extension direction.

4. A vacuum grain storage bin as described in claim 1, characterized in that, The cover has a first sealing groove on its circumferential side, and the first base ring is fitted into the first sealing groove.

5. A vacuum grain storage bin as described in claim 1, characterized in that, The cover includes an upper cover, a lower cover, and a trigger block. The upper cover and the lower cover form the cavity. The lower cover has a vent hole communicating with the grain storage space. The upper cover has an opening for the trigger block to move up and down. The trigger block has a first position for activating the vacuum assembly and a second position higher than the first position. The trigger block has a plug-in post that fits with the vent hole with a clearance. A second sealing ring is fitted onto the plug-in post. The second sealing ring includes a second base ring and a second sealing lip ring formed by the circumferential protrusion of the second base ring. The second sealing lip ring protrudes in a direction opposite to the plug-in post and is interference-fitted between the plug-in post and the vent hole. When the trigger block is in the first position, the plug is inserted into the vent hole and the vent hole is circumferentially sealed by the second sealing lip ring. When the trigger block is in the second position, the plug is disengaged from the vent hole, thus releasing the seal.

6. A vacuum grain storage bin as described in claim 5, characterized in that, The side of the plug is provided with a second sealing groove, the second base ring is fitted into the second sealing groove, and the second base ring is clearance-fitted with the vent hole.

7. A vacuum grain storage bin as described in claim 6, characterized in that, The length of the second sealing lip ring extending beyond the radial range of the plug post is A, and the gap between the plug post and the adjacent hole wall of the vent hole is B, where 1.5≤A / B≤3.

8. A vacuum grain storage bin as described in claim 5, characterized in that, The second sealing lip ring has multiple lip rings and is spaced apart along the axial direction of the second base ring.

9. A vacuum grain storage bin as described in claim 5, characterized in that, The width of the cross-section of the second sealing lip ring gradually decreases in the convex direction.

10. A vacuum grain storage bin as described in claim 5, characterized in that, The trigger block is equipped with a magnetic element, and the vacuum assembly includes a vacuum pump and a Hall unit. When the trigger block is in the first position, the magnetic element triggers the Hall unit, and when the trigger block is in the second position, the triggering is deactivated. The triggering of the Hall unit is used to start the vacuum pump.

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