Vacuum-sealed device

Abstract

A vacuum-sealed device, comprising: a container (100), the container having an opening (120), and at least one stop surface being provided on the inner wall of the container at the opening; an upper lid (200), the upper lid comprising a lid body (220), a driving member (240), and a driven member (260) moving in a vertical direction under the action of the driving member; and a sealing assembly (300), a sealed space (160) being formed between the sealing assembly (300) and the stop surface, wherein the sealing assembly at least comprises a first deformation portion (330) which is filled into the sealed space under the driving action of the driven member. The device can actively reduce the vacuum degree in the container and has excellent sealing performance.

Description

A vacuum sealing device Technical Field

[0001] This application relates to the field of household utensils or containers, and more specifically to a vacuum sealing device. Background Technology

[0002] Household food storage containers are primarily designed to preserve food or ingredients for longer periods, and mainly consist of a lid, container, and sealing element. Chinese patent CN 201120228403.3 discloses a food storage box with a basic lid, body, and sealing ring. The lid is secured by multiple locking mechanisms that engage with the body. This product does not have a vacuum function. To improve the sealing performance, the locking mechanisms require more effort to use; conversely, reducing the locking mechanism's effectiveness may result in insufficient sealing.

[0003] In reality, many existing products passively create a vacuum seal by placing food or ingredients into containers at heated or room temperature within the low-temperature environment of a refrigerator. It is difficult to actively create a vacuum seal in an environment where the temperature remains constant.

[0004] Chinese patent CN 200920064719.6 discloses a negative pressure food storage container with a lid. The lid features a one-way valve and a high-strength elastic membrane that causes the lid to indent under pressure, achieving air release without the need for a vacuum device. However, this product still uses traditional locking mechanisms, failing to guarantee a tight seal while improving usability. Furthermore, how to achieve a sealed connection between the high-strength elastic membrane and the rigid lid remains a challenge.

[0005] Chinese patent CN 201320116038.6 discloses a container lid device with automatic vacuuming function. This device can actively create a vacuum environment, but the product is too complicated. The lid is equipped with a pump motor, which requires power to vacuum, and the sealing design of the product is insufficient.

[0006] Chinese patent CN 202221400701.0 discloses a stainless steel vacuum insulated lunch box with a pre-drilled vacuum hole on the container. This product requires an additional negative pressure source during use, and the vacuum design may compromise the product's sealing performance. Summary of the Invention

[0007] The purpose of this application is to provide a vacuum sealing device that can actively reduce the vacuum level inside a container, providing excellent sealing performance while improving the ease of use of the product.

[0008] To achieve the above objectives, this application proposes a vacuum sealing device, which includes:

[0009] A container having an opening, wherein the inner wall of the container at the opening is provided with at least one stop surface;

[0010] The cover includes a cover body, a driving member, and a driven member that moves vertically under the action of the driving member; and

[0011] A sealing component that forms a sealing space with the stop surface;

[0012] The sealing assembly includes at least one first deformable portion that is filled into the sealing space under the driving action of the driven member.

[0013] The sealing components of this application include, but are not limited to, silicone, rubber, latex, or other materials that can deform to achieve a sealing effect.

[0014] Preferably, the stop surface is concave or convex.

[0015] As an optional implementation, the stop surface is specifically a groove provided on the inner wall of the container at the opening, forming a sealed space with the sealing component. The first deformation part of the sealing component undergoes amplified deformation under the driving action of the driven member, filling the sealed space and achieving a sealing effect.

[0016] As another optional implementation, the stop surface is specifically a ring of raised strips provided on the inner wall of the container at the opening. The raised strips should be continuous to ensure a sealing effect. The sealing component and the raised strips form a semi-open sealed space. When the first deformable part of the sealing component undergoes amplified deformation under the driving action of the driven member, it fills the semi-open sealed space, achieving a sealing effect.

[0017] Furthermore, the follower has at least one inclined surface for driving the first deformation part. The inclined surface can be set at any position on the upper edge, lower edge, or middle of the follower, and can have any slope, but it can at least provide a horizontal component during vertical movement. Specifically, when acting on the first deformation part, it forces it to move away from the center, thereby achieving amplified deformation as a whole.

[0018] As a preferred embodiment, the first deformable part includes a thickened ring that contacts the inclined surface to improve the interference fit effect during sealing.

[0019] As a preferred embodiment, the cover includes an inner concave wall located inside the opening and a settling plane for mounting the active component.

[0020] Furthermore, the sealing assembly also includes a second deformable portion disposed between the concave wall and the container sidewall to form an interference fit.

[0021] Optionally, the cover includes an outer edge wall located outside the opening, and a top wall connecting the inner concave wall and the outer edge wall.

[0022] The sealing assembly also includes a third deformation section disposed between the top wall and the outer edge of the opening.

[0023] The sealing assembly of this application shall include at least a first deformable portion, and optionally a second deformable portion and / or a third deformable portion. These components may exist independently or form an integral structure.

[0024] The sealing assembly of this application can be partially fixed at any position of the driven member, or it can be fitted as an independent structure on the outside of the driven member.

[0025] In a preferred embodiment, the sealing assembly is a flat cylindrical shape with a bottom surface and sidewalls. A thickening ring is provided within the sidewalls, and the space between the thickening ring and the bottom surface is used to accommodate a driven member. A beveled surface along the sidewall of the driven member contacts the thickening ring. Such a sealing assembly can be easily disassembled for cleaning and can also be replaced after aging.

[0026] Furthermore, the driven member includes an inner sleeve that is threadedly engaged with the driving member to allow relative movement in the vertical direction, and a first limiting mechanism that engages with the cover to restrict rotation of the driven member. When the driving member rotates relative to the cover, the driven member can move in the vertical direction.

[0027] The first limiting mechanism can be a groove or protrusion provided on the driven member, and correspondingly, the cover body is provided with a protrusion or groove of matching shape. There can be one or more first limiting mechanisms, preferably two or more distributed in a centrally symmetrical manner, so as to ensure that the driving member and the driven member are parallel during relative movement.

[0028] In the first preferred embodiment, the inner sleeve has external threads, and the driving member includes an outer sleeve with internal threads. The advantage of this design is that the internal and external threads can self-lock when the distance between the driving and driven members is minimal, thus maintaining the pressure applied by the driven member to the first deformed portion. However, a disadvantage is that the driving member may require a relatively large number of rotations.

[0029] In a second preferred embodiment, the inner sleeve is provided with an internal thread, and the driving member includes a bolt member. The side wall of the bolt member is provided with at least one protrusion that mates with the internal thread. This design does not require a specific number of thread turns, but the blind end of the internal thread should include at least a horizontal groove or an inclined groove forming a certain angle with the helix angle of the internal thread, so as to keep the driven member from falling back due to gravity when the distance between the driving member and the driven member is minimal, and to continuously apply pressure to the first deformed part into the sealed space.

[0030] Furthermore, the driving member and / or driven member also include end caps for limiting the maximum distance between them in the vertical direction.

[0031] Furthermore, the cover is provided with an annular guide rail that slides with the active component, and a second limiting mechanism that restricts the movement of the active component in the vertical direction.

[0032] Furthermore, a compressed spring is provided between the lid and the driven component, which not only ensures the overall appearance of the lid, but also reduces the vacuum level to a certain extent by reducing the air volume, making it easier for the user to open the container.

[0033] The vacuum sealing device provided in this application can be used to preserve food or other products that need to be isolated from air to prevent spoilage, including but not limited to fresh foods such as fruits, vegetables, meat, fish, shrimp, eggs, and dairy products (e.g., milk, cream, butter); it can also be used to preserve processed food, including but not limited to dried food, dehydrated food, pickled food, baked food, and cooked food. In addition, it can also be used to preserve vegetable oil, animal fat, seasonings, spices, etc. Attached Figure Description

[0034] Figure 1 is a schematic diagram of the structure of a vacuum sealing device according to Embodiment 1;

[0035] Figure 2 is an exploded view of Figure 1;

[0036] Figure 3 is a schematic diagram of the longitudinal section of Figure 1;

[0037] Figure 4 is a partially enlarged schematic diagram of part A in Figure 3;

[0038] Figure 5 is a three-dimensional schematic diagram of the active component described in Embodiment 1;

[0039] Figure 6 is a three-dimensional schematic diagram of the driven member described in Embodiment 1;

[0040] Figure 7 is a longitudinal cross-sectional view of the driven member described in Embodiment 1;

[0041] Figure 8 is a longitudinal cross-sectional view of the vacuum sealing device of Example 3 after the container is removed.

[0042] Figure 9 is a schematic diagram of the active component in Embodiment 3. Detailed Implementation

[0043] The present application will be further described below with reference to the embodiments and accompanying drawings.

[0044] Example 1

[0045] As shown in Figures 1 and 2, this embodiment provides a vacuum sealing device, including a container 100, a top cover 200, and a sealing assembly 300. The top cover 200 includes a cover body 220, an active member 240, and a driven member 260, and the side edge of the cover body 220 is not provided with any locking mechanism that engages with the container 100. The active member 240 and the driven member 260 are threaded together. When the active member 240 rotates, the driven member 260 can move vertically within a certain distance, simultaneously driving at least one deformable portion of the sealing assembly 300 to move vertically. The container 100 is cylindrical, with an opening 120 at the top, and at least one stop surface on the inner wall of the container at the opening. The sealing assembly 300 is made of rubber material, free of harmful volatile substances, preferably food-grade safe rubber material. In the unsealed state, a semi-open sealed space 160 is formed between the sealing assembly 300 and the stop surface. When the deformable portion of the sealing assembly 300 moves vertically to a sealed state under the driving action of the follower 260, the first deformable portion 330 in the sealing assembly 300 is filled into the semi-open sealing space 160, thereby isolating the air inside the container 100 from the external atmosphere and forming a sealed space. The sealed space is enclosed by the container and the sealing assembly. Here, the semi-open sealing space 160 refers to a space with a lower sealing performance than the sealed space.

[0046] The vertical direction includes directions that are parallel or approximately parallel to the extension direction of the central axis (dotted line) in Figure 3. Approximate parallelism can be due to non-strict parallelism caused by process, parameters, or operational reasons.

[0047] The stop surface can be concave or convex, and can be a continuous surface or multiple surfaces spaced apart along the inner wall of the opening, depending on how the shape of the first deformable part 330 is arranged.

[0048] As a preferred embodiment, referring further to Figures 3 and 4, the stop surface is an annular protrusion 140 disposed on the inner wall of the container 100 at the opening 120. The sealing assembly 300 has an annular sidewall 310 and a bottom surface 320 similar in shape to the opening 120. The first deformation portion 330 is a thickened ring 330 disposed within the annular sidewall 310 of the sealing assembly. In the unsealed state, a semi-open sealed space 160 is formed between the thickened ring 330 and the annular protrusion 140; when the driven member 260 moves vertically upward, it drives the thickened ring 330 to undergo amplified deformation and fill the aforementioned semi-open sealed space 160, thereby achieving a sealed state. At the same time, during the process of the driven member 260 moving upward to gradually seal, the air pressure inside the container 100 is reduced to provide a certain degree of vacuum inside the container 100, which can extend the preservation time of the food or ingredients inside the container 100 to a certain extent. Reducing the vacuum degree is also beneficial for heat preservation.

[0049] As another alternative, the stop surface can also be an annular groove set on the inner wall of the container at the opening. This requires the first deformable part to have a larger deformation under the drive of the driven member, so as to fill the sealing space in the annular groove to achieve a seal.

[0050] As an alternative, the follower can either drive the first deformation section to amplify its deformation when moving vertically upwards, or it can be designed to trigger when moving vertically downwards. However, when this method is used to achieve a seal, the air inside the container is compressed to some extent, which introduces instability to the sealing performance.

[0051] Referring to Figures 3, 4, 6, and 7, to improve the efficiency of driving the first deformation part 330 to amplify deformation during vertical movement of the driven member 260, at least one inclined surface 261 for driving the first deformation part 330 is provided on the driven member 260. This inclined surface 261 can be located at any position—the upper edge, lower edge, or middle—of the driven member 260, and can have any slope, but it must at least provide a horizontal component during vertical movement. Simultaneously, a portion of the sealing assembly 300 may be configured not to displace along with the movement of the first deformation part 330, or even if displacement occurs, the displacement stroke must be less than the stroke of the driven member 260. This ensures that the first deformation part 330 is compressed and undergoes amplified deformation under the action of the horizontal component.

[0052] Based on the aforementioned preferred embodiment, the inclined surface 261 can be further disposed on the upper edge of the side wall 310 of the driven member 260, forming a continuous annular structure that abuts against the thickened ring 330. As another alternative, if a scheme in which the driven member drives the first deformation portion to undergo amplified deformation when moving vertically downward is selected, the inclined surface can be designed on the lower edge of the side wall of the driven member.

[0053] In addition, the thickened ring 330, side wall 310 and bottom surface 320 of the sealing assembly 300 together form an installation space that is adapted to the shape of the follower 260, forming a barrier to separate the food or ingredients in the container 100 from the follower 260, which is beneficial for product cleaning and maintenance.

[0054] As a preferred embodiment, referring to Figures 1 to 5, the actuator 240 is provided with an elevated handle 242, which can be designed in any shape to facilitate user turning. Correspondingly, the cover 220 may also optionally be provided with a concave wall 222 and a settling plane 221. The concave wall 222 is located inside the container opening 120, and the settling plane 221 is connected to the lower end of the concave wall 222, forming a semi-open receiving space to receive the actuator 240, so that the top of the actuator 240 does not exceed the cover 220, preventing the unintended triggering of the rotation of the actuator 240, thereby affecting the sealing performance of the product. Nevertheless, the elevated handle 242 and the settling plane 221 are not essential for the actuator 240. For example, as an alternative, the upper surface of the actuator 240 is partially recessed downward to form a structure similar to a handle that facilitates user turning; or a handle is hinged to the actuator 240 and received in a groove that conforms to its shape when not in use.

[0055] Besides forming a semi-open receiving space for the active component 240, the concave wall 222 plays a crucial role in further enhancing the seal between the cover 220 and the inner wall of the container at the opening. As a preferred embodiment, referring further to Figures 3 and 4, the sealing assembly 300 also includes a second deformation portion 340 located between the concave wall 222 and the inner wall of the container to form an interference fit, which is integral with the first deformation portion 330. The deformation of the second deformation portion 340 refers to the compressive deformation it experiences between the inner wall at the container opening and the concave wall 222; therefore, the second deformation portion 340 does not shift with the movement of the first deformation portion 330. The second deformation portion 340 is based on a ring shape, and its outer side wall preferably has a shape adapted to the inner wall of the container at the opening, while its inner side wall preferably has a shape adapted to the inner surface of the concave wall 222. The second deformation section 340 may be further provided with cavities or grooves, or a material with a lower elastic modulus may be selected to further enhance the sealing performance by increasing the deformation.

[0056] As a further preferred embodiment, the cover 220 may further include an outer edge wall 223 and a top wall 224 connecting the inner concave wall 222 and the outer edge wall 223. The sealing assembly 300 may further include a third deformation portion 350 disposed between the top wall 224 and the outer edge of the opening 120, which is integrally formed with the first deformation portion 330 and the second deformation portion 340. In this case, the outer edge wall 223, the container sidewall at the opening, and the inner concave wall 222 form a parallel three-layer sandwich structure. The sealing assembly 300 extends further along the inner concave wall 222 toward the top wall 224, and then extends further outward at the top wall 224 to form the third deformation portion 350. The deformation of the third deformation portion 350 refers to the compressive deformation between the outer edge of the container opening 120 and the top wall 224, which is used to further improve the sealing performance of the cover 220 at the opening. The outer edge wall 223, the top wall 224, and the inner concave wall 222 together form a deep groove structure, which provides a more efficient positioning method for the user to close the top cover 200 at the container opening. In contrast, the existing top cover may fail to seal effectively when the container is closed due to inaccurate sealing positioning.

[0057] As a further preferred embodiment, the opening 120 of the container 100 is a constricted opening, which, when constricted, forms a space to accommodate the outer edge wall 223, thereby improving the overall appearance of the product. This design also prevents users from mistakenly believing that they need to lift the outer edge wall 223 to open the top cover 200.

[0058] It is worth noting that, due to the design of the outer edge wall 223 and the third deformation portion 350, the sealing assembly 300 is not easily disassembled for cleaning or replacement. To solve this problem, the third deformation portion 350 of the sealing assembly 300 is also provided with a tongue 360 ​​that extends further outward from the outer edge wall 223.

[0059] The following will describe the structure and connection relationship of the mutual movement of the driving member 240 and the driven member 260. It should be noted that the scope of protection claimed in this application is not limited to this embodiment. Any prior art in which the driven member 260 can move in the vertical direction under the action of the driving member 240 is within the scope of protection of this application. As a preferred embodiment of this application, the driven member 260 includes an inner sleeve 262 that is threadedly engaged with the driving member 240 to move relative to it in the vertical direction, and a first limiting mechanism that cooperates with the cover 220 to limit the rotation of the driven member 260. As can be seen from Figure 4, the first limiting mechanism includes two limiting protrusions 225 extending from the lower surface of the cover 220, and a limiting groove 265 on the upper surface of the driven member 260 that matches the shape of the limiting protrusions 225. When the driving member 240 rotates relative to the cover 220, the driven member 260 can move in the vertical direction, but will not rotate.

[0060] As shown in Figures 6 and 7, the inner sleeve 262 has an internal thread 263. In this embodiment, the internal thread 263 is a half-lead double-threaded thread with a thread helix angle of 10-45°. The lifting and lowering action of the driven member 260 is achieved by the driving member 240 rotating 180°. The blind end of the internal thread 263 is located at the lower part of the inner sleeve 262 and has a horizontal groove 264. Referring further to Figure 5 and in conjunction with Figure 3, the bottom of the driving member 240 is provided with a bolt 244 that can pass through the cover 220 and be inserted into the inner sleeve 262. The side wall 310 of the bolt 244 is provided with a pair of protrusions 246 that mate with the internal thread 263. When the driving member 240 rotates clockwise, the protrusions 246 move from the upper part of the inner sleeve 262 along the internal thread 263 to the lower part and gradually approach the blind end. At this time, the driven member 260 will move vertically from bottom to top accordingly. When the protrusion 246 slides into the horizontal groove 264 at the blind end, it provides a stable upward support force to the horizontal groove 264, preventing the driven member 260 from slipping off due to gravity. In addition, the driven member 260 can be designed as a hollow structure to reduce its own weight and to increase the friction between the driving member 240 and the cover 220 during rotational engagement. These designs can improve the "self-locking" performance of the driven member 260, providing effective protection for the sealing performance.

[0061] As shown in Figures 2 and 3, after the actuator 244 is inserted into the socket of the inner sleeve 262, an end cap 280 is installed at the end of the actuator 244 to limit the maximum vertical distance between the driving member 240 and the driven member 260. Specifically, when the driving member 240 rotates counterclockwise, the protrusions 246 on both sides of the actuator 244 move from the lower part of the inner sleeve 262 along the internal thread 263 to the upper part. At this time, the driven member 260 moves downward in the vertical direction until the end cap 280 is blocked at the socket of the inner sleeve 262. At this time, the maximum distance between the driving member 240 and the driven member 260 is reached. As shown in Figure 7, the bottom of the driven member 260 is provided with a mounting hole 266 for the end cap 280 to pass through, so as to realize assembly.

[0062] The driving member 240 must be guaranteed not to undergo vertical displacement during rotation in order to drive the driven member 260 most efficiently. Referring to Figures 3 to 5, an annular guide rail 226 is provided on the cover 220 to slide and engage with the driving member 240. A second limiting mechanism can also be provided between the cover 220 and the driving member 240 to restrict the vertical movement of the driving member 240. The second limiting mechanism may include, but is not limited to, the annular guide rail 226. In this embodiment, the width of the annular guide rail 226 gradually increases along the height direction, and the bottom of the driving member 240 has a locking groove 248 that matches the shape of the annular guide rail 226. The two can be locked together by pressing the driving member 240 forcefully against the cover 220. It should be understood that the method of preventing vertical displacement while ensuring the rotation of the driving member is not limited to this; many other options are possible. For example, the driving member can be embedded into the cover from the side, or other intermediate parts can be provided on the driving member, which are fixedly engaged with the cover.

[0063] As shown in Figures 2 and 3, as a further optimization of this embodiment, a compressed spring 267 can be provided between the cover 220 and the driven member 260. More specifically, the spring 267 is sleeved on the inner sleeve 262 of the driven member 260 and abuts against the bottom surface of the cover 220. This design helps to ensure the overall appearance of the cover 200 and prevents wobbling or swinging between the driven member 260 and the driving member 240. This design also helps the user to more easily release the seal and open the cover. The spring's rebound force allows the driven member to move downwards more efficiently, reducing the air volume inside the container and thus lowering the vacuum level, making it easier for the user to open the container.

[0064] Example 2

[0065] This embodiment provides another method of engagement between the driving and driven components: the driven component has an inner sleeve with external threads, and the driving component also has an outer sleeve with internal threads that can engage with the external threads of the inner sleeve for thread self-locking. When the driving component is rotated clockwise, the internal and external threads can achieve thread self-locking when the distance between the driving and driven components is minimal; after thread self-locking, the driven component will not rotate under its own weight or a small restoring force. When the driving component is rotated counterclockwise with a larger force, the thread self-locking will be activated. Thread self-locking is a known technique in mechanical design; it can be achieved by the thread helix angle being less than or equal to the friction angle between the threads.

[0066] Furthermore, a threaded retaining ring or similar structure can be provided on the top of the inner sleeve to limit the maximum distance between the driving and driven parts, thereby replacing the end cap design in Embodiment 1.

[0067] This embodiment provides only one alternative implementation of the cooperation between the active and driven components. Other technical means, sealing components and sealing principles are based on the preferred implementation of Embodiment 1 or other optional methods.

[0068] Example 3

[0069] The above-described embodiments 1 and 2 provide a drive mechanism where the driving and driven components are primarily engaged by threaded connections. In this embodiment, the driving and driven components are engaged by a pressing mechanism. Apart from this, other technical means, sealing components, and sealing principles are based on the preferred embodiments of embodiment 1, or other optional methods.

[0070] The cover is positioned between the driving member and the driven member. At least one lever mechanism is provided on the cover. The lower end of the lever mechanism is hinged to the upper surface of the driven member, and the upper end of the lever mechanism abuts against the lower end of the driving member. When the driving member is pressed downwards, the driven member moves upwards under the action of the lever mechanism.

[0071] To prevent the driven part from falling downwards, a push-type telescopic locking mechanism can be set between the driving part and the cover. This mechanism includes a ratchet mechanism and a return spring. These structures and their principles are exactly the same as the push-to-reset mechanism of a ballpoint pen.

[0072] Example 4

[0073] Please refer to Figure 8. Based on the above embodiment 1, the end cap 280 can be configured as a hollow structure, and the bolt 244 can also be a hollow structure. A connector 290 with external threads passes through the hollow structure of the end cap and connects with the hollow structure of the bolt 244 to increase the transmission efficiency.

[0074] The end cap and the bolt 244 are respectively provided with a locking block and a locking groove 245 to restrict the movement of the end cap. The part where the follower 260 and the end cap 280 mate may also be provided with a limiting step 268.

[0075] To enhance the stability of the entire device, multiple reinforcing ribs 247 can be extended along the axial direction on the outer side wall of the bolt 244, as shown in Figure 9.

[0076] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A vacuum sealing device, characterized in that... include: A container having an opening, wherein the inner wall of the container at the opening is provided with at least one stop surface; The upper cover includes a cover body, an active member, and a driven member that moves in a vertical direction under the action of the active member; and A sealing assembly that forms a sealing space with the stop surface; The sealing assembly includes at least one first deformable portion that is filled into the sealing space under the driving action of the driven member.

2. A vacuum sealing device according to claim 1, characterized in that: The stop surface is either concave or convex.

3. A vacuum sealing device according to claim 1, characterized in that: The driven member has at least one inclined surface for driving the first deformable part.

4. A vacuum sealing device according to claim 3, characterized in that: The first deformed portion includes a thickened ring that is in contact with the inclined surface.

5. A vacuum sealing device according to claim 4, characterized in that: The cover includes an inner concave wall located inside the opening, and a settling plane for mounting the active component.

6. A vacuum sealing device according to claim 5, characterized in that: The sealing assembly further includes a second deformable portion disposed between the concave wall and the container sidewall to form an interference fit.

7. A vacuum sealing device according to claim 5, characterized in that: The cover includes an outer edge wall located outside the opening, and a top wall connecting the inner concave wall and the outer edge wall.

8. A vacuum sealing device according to claim 7, characterized in that: The sealing assembly further includes a third deformation portion disposed between the top wall and the outer edge of the opening.

9. A vacuum sealing device according to claim 8, characterized in that: The sealing assembly is a single, integral structure.

10. A vacuum sealing device according to claim 1, characterized in that: The driven member includes an inner sleeve that is threadedly engaged with the driving member to move relative to it in a vertical direction, and a first limiting mechanism that engages with the cover to restrict the rotation of the driven member.

11. A vacuum sealing device according to claim 10, characterized in that: The inner sleeve is provided with external threads, and the driving component includes an outer sleeve provided with internal threads.

12. A vacuum sealing device according to claim 10, characterized in that: The inner sleeve is provided with an internal thread, and the driving member includes a bolt member. The side wall of the bolt member is provided with at least one protrusion that mates with the internal thread.

13. A vacuum sealing device according to claim 11 or 12, characterized in that: The active and / or driven member also includes an end cap for limiting the maximum distance between them in the vertical direction.

14. A vacuum sealing device according to claim 1, characterized in that: The cover is provided with an annular guide rail that slides with the active component, and a second limiting mechanism that restricts the movement of the active component in the vertical direction.

15. A vacuum sealing device according to claim 1, characterized in that: A spring in a compressed state is provided between the cover and the driven member.

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