Vacuum sealing device

Abstract

The utility model discloses a vacuum sealing device which comprises a container, an upper cover and a sealing assembly, and the upper cover comprises a cover body, a driving part and a driven part which moves along the vertical direction under the action of the driving part. The sealing assembly at least comprises a deformation part, the deformation part is amplified and deformed under the driving action of the driven part, the sealed space is filled with the deformation part to achieve sealing, and the vacuum degree of the inner cavity of the container can be increased after the driven part moves in the process. The sealing assembly has excellent sealing performance, and does not need greater force to open the upper cover.

Description

Technical Field

[0001] The utility model relates to the field of household utensils or containers, in particular to a vacuum sealing device. Background Art

[0002] Household fresh-keeping containers are mainly designed to preserve food or ingredients for a longer period of time, and mainly include a lid, a container, and a seal. Chinese patent CN 201120228403.3 discloses a fresh-keeping box, which has the most basic lid, a box body, and a sealing ring. The lid is provided with a plurality of locking parts that are buckled with the box body. The product does not have a vacuum function; if the sealing performance is to be improved, the locking parts will be more laborious when used; on the contrary, if the buckling effect of the locking parts is reduced, insufficient sealing may result.

[0003] In fact, many existing products put food or ingredients into containers at heated or room temperature, and passively form a vacuum-tight effect in the low temperature environment of the refrigerator. If the temperature does not change, it is difficult to actively form a vacuum-tight effect.

[0004] Chinese patent CN 200920064719.6 discloses a lid-locked negative pressure fresh-keeping box, in which a one-way valve is provided on the lid, and a high-strength elastic film is provided on the lid, so that the lid is sunken inward when stressed, and the exhaust effect can be achieved without the aid of an exhaust device. Despite this, the product still uses traditional lock fasteners, which cannot ensure sealing while improving ease of use. Moreover, how the high-strength elastic film used in this technology forms a sealed connection with the rigid lid is also a problem.

[0005] Chinese patent CN 201320116038.6 discloses a container cover device with automatic vacuuming function, which can actively achieve a vacuum environment, but the product is too complicated. A pump motor is provided on the box cover, which requires power supply to vacuumize, and the sealing design of the product is insufficient.

[0006] Chinese patent CN 202221400701.0 discloses a stainless steel vacuum insulation lunch box with a vacuum hole reserved on the container. The product requires an additional negative pressure source when in use, and the vacuum design may destroy the sealing performance of the product. Summary of the invention

[0007] The purpose of the present application is to provide a vacuum sealing device that can actively reduce the vacuum degree in a container, has excellent sealing performance and improves the usability of the product.

[0008] In order to achieve the above object, the present application proposes a vacuum sealing device, which comprises:

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

[0010] An upper cover, the upper cover comprising a cover body, an active member, and a driven member moving in a vertical direction under the action of the active member; and

[0011] A sealing assembly, which forms a sealing space with the stop surface;

[0012] The sealing assembly includes at least one first deformation portion which is filled into the sealing space under the driving action of the follower.

[0013] The sealing components described in the present 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 a concave surface or a convex surface.

[0015] As an optional embodiment, the stop surface is specifically a circle of grooves arranged on the inner wall of the container at the opening, forming a closed space between the stop surface and the sealing component. The first deformation portion of the sealing component undergoes amplified deformation under the driving action of the follower, and fills the closed space to achieve a sealing effect.

[0016] As another optional embodiment, the stop surface is specifically a circle of convex strips arranged on the inner wall of the container at the opening, and the convex strips should be continuous to ensure the sealing effect. The sealing component and the convex strips form a semi-open sealing space, and when the first deformation part of the sealing component is amplified and deformed under the driving action of the follower, it will be filled into the semi-open sealing space to achieve a sealing effect.

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

[0018] As a preferred solution, the first deformation portion includes a thickened ring in contact with the inclined surface to improve the interference fit effect during sealing.

[0019] As a preferred solution, the cover body includes an inner concave wall arranged on the inner side of the opening, and a subsidence plane for mounting the active component.

[0020] Furthermore, the sealing assembly also includes a second deformation portion provided between the inner concave wall and the container side wall to form an interference fit.

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

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

[0023] The sealing assembly described in the present application should include at least a first deformation portion, and optionally a second deformation portion and / or a third deformation portion. These components can exist independently or form an integral structure.

[0024] The sealing assembly described in the present application can be partially fixed at any position of the driven member, or can be used as an independent structure and sleeved on the outside of the driven member.

[0025] As a preferred embodiment, the sealing assembly is in the shape of an oblate cylinder, having a bottom surface and a side wall. A thickening ring is provided inside the side wall, and the space between the thickening ring and the bottom surface is used to accommodate the follower, and a circle of inclined surface is provided on the upper edge of the side wall of the follower to contact the thickening ring. Such a sealing assembly can be easily disassembled for cleaning, and can also be replaced after it is aged.

[0026] Furthermore, the driven member includes an inner sleeve threadedly matched with the active member to move relative to the active member in a vertical direction, and a first limit mechanism matched with the cover body to limit the rotation of the driven member. When the active member rotates relative to the cover body, the driven member can move in the vertical direction.

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

[0028] As a first preferred embodiment, the inner sleeve is provided with an external thread, and the active member includes an outer sleeve provided with an internal thread. The advantage of this design is that the internal thread and the external thread can be self-locked when the distance between the active member and the driven member is the smallest, so as to maintain the pressure applied by the driven member to the first deformation part. However, the disadvantage is that the active member may need to rotate a large number of times.

[0029] As a second preferred embodiment, the inner sleeve is provided with an internal thread, the active member includes a bolt-actuated member, and the side wall of the bolt-actuated member is provided with at least one protrusion that cooperates with the internal thread. This design has no requirement on the number of thread turns, but the blind end of the internal thread should include at least a horizontal groove or an inclined groove that forms a certain angle with the internal thread lead angle, so as to maintain the follower from falling back under the influence of gravity when the distance between the active member and the follower is the smallest, and continuously apply pressure to the first deformation part to the closed space.

[0030] Furthermore, the active member and / or the driven member further comprises an end cover for limiting the maximum distance between the active member and the driven member in the vertical direction.

[0031] Furthermore, the cover body is provided with an annular guide rail slidably matched with the active member, and a second limiting mechanism for limiting the movement of the active member in the vertical direction.

[0032] Furthermore, a spring in a compressed state is provided between the cover body and the follower, which not only ensures the overall appearance of the upper cover, but also reduces the vacuum degree to a certain extent after reducing the air volume, which is beneficial for users to open the container.

[0033] The vacuum-sealed device provided in the present application can be used to preserve food ingredients or other products that need to be isolated from air to prevent spoilage, including but not limited to fresh food such as fruits, vegetables, meat, fish, shrimp, eggs, dairy products (such as milk, cream, butter), etc.; it can also be processed food ingredients or foods, including but not limited to dried food ingredients, dehydrated food ingredients, pickled food ingredients, baked food, cooked food, etc. In addition, it can also be used to preserve vegetable oils, animal fats, seasonings, spices, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a vacuum sealing device described in Example 1;

[0035] Figure 2 yes Figure 1 Exploded diagram of

[0036] Figure 3 yes Figure 1 Schematic diagram of longitudinal section;

[0037] Figure 4 yes Figure 3 A partial enlarged schematic diagram of the middle A part;

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

[0039] Figure 6 is a three-dimensional schematic diagram of the follower described in Example 1;

[0040] Figure 7 It is a schematic longitudinal section diagram of the follower described in Example 1. DETAILED DESCRIPTION

[0041] The present application is further described below in conjunction with embodiments and drawings.

[0042] Example 1

[0043] like Figure 1 , Figure 2 As shown, this embodiment provides a vacuum sealing device, including a container 100, an upper cover 200 and a sealing assembly 300. The upper 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 cooperates with the container 100. The active member 240 and the driven member 260 cooperate with each other through threads. When the active member 240 rotates, the driven member 260 can move within a certain distance in the vertical direction, and at the same time drive at least one deformed part of the sealing assembly 300 to move in the vertical direction. The container 100 is cylindrical, with an opening 120 at the top, and at least one stop surface is provided on the inner wall of the container at the opening. The sealing assembly 300 is made of a rubber material, does not contain harmful volatile substances, and is preferably a food-grade safe rubber material. When the sealing assembly 300 is in a non-sealed state, a sealed space is formed between the sealing assembly 300 and the stop surface. When the deformed portion of the sealing assembly 300 moves in the vertical direction to a sealing state under the driving action of the follower 260, the first deformed portion 330 in the sealing assembly 300 is filled into the closed space, thereby isolating the air in the container 100 from the external atmosphere.

[0044] The stop surface may be a concave surface or a convex surface, and may be a continuous surface or a plurality of surfaces spaced apart along the inner wall of the opening, depending on how the shape of the first deformation portion 330 is set.

[0045] As a preferred implementation, please further combine Figure 3 , Figure 4As shown, the stop surface is an annular ridge 140 disposed on the inner wall of the container 100 at the opening 120. The sealing assembly 300 has an annular side wall 310 and a bottom surface 320 similar in shape to the opening 120. The first deformation portion 330 is a circle of thickening ring 330 disposed in the annular side wall 310 of the sealing assembly. In a non-sealed state, a semi-open sealed space 160 is formed between the thickening ring 330 and the annular ridge 140; when the follower 260 moves vertically upward, the thickening ring 330 is driven to undergo an enlarged deformation and fill into the aforementioned semi-open sealed space 160, thereby achieving a sealed state. At the same time, the follower 260 will reduce the air pressure in the container 100 during the upward movement to the gradual sealing process, so as to provide a certain vacuum degree in the container 100, which can extend the storage time of the ingredients or food in the container 100 to a certain extent, and reducing the vacuum degree is also conducive to heat preservation.

[0046] As another optional method, the stop surface can also be an annular groove arranged on the inner wall of the container at the opening, which requires the first deformation part to have a larger deformation under the drive of the follower, so as to fill the enclosed space in the annular groove to achieve sealing.

[0047] As another optional method, the follower can be designed to be triggered when it moves vertically downward, in addition to driving the first deformation part to amplify the deformation when it moves vertically upward. However, after the sealing is achieved in this way, the air in the container is compressed to a certain extent, which brings an unstable factor to the sealing performance.

[0048] See also Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in order to improve the efficiency of driving the first deformable part 330 to amplify the deformation when the follower 260 moves vertically, at least one inclined surface 261 for driving the first deformable part 330 is provided on the follower 260. The inclined surface 261 can be set at the upper edge, lower edge or any position in the middle of the follower 260, and can have any slope, but at least it can provide a horizontal component during vertical movement. At the same time, the sealing component 300 can also have a part of the structure that is set not to be displaced with the movement of the first deformable part 330, or even if it is displaced, the displacement stroke is smaller than the stroke of the follower 260, so that the first deformable part 330 can be squeezed and amplified under the action of the horizontal component.

[0049] Based on the above preferred embodiment, the inclined surface 261 can be further arranged on the upper edge of the side wall 310 of the follower 260 to form a continuous annular structure, which conflicts with the thickened ring 330. As another optional method, if the solution is selected in which the follower drives the first deformation part to amplify the deformation when the follower moves vertically downward, the inclined surface can be designed on the lower edge of the side wall of the follower.

[0050] In addition, the thickened ring 330, side wall 310 and bottom surface 320 of the sealing assembly 300 together form an installation space that matches the shape of the follower 260, forming a barrier to isolate the ingredients or food in the container 100 from the follower 260, which is beneficial to the cleaning and maintenance of the product.

[0051] As a preferred embodiment, see Figures 1 to 5 As shown, the active member 240 is provided with an increased handle 242, and the handle 242 can be designed to be any shape that is convenient for the user to twist; correspondingly, the cover 220 can also selectively be provided with an inner concave wall 222 and a sedimentation plane 221. The inner concave wall 222 is located on the inner side of the container opening 120, and the sedimentation plane 221 is connected to the lower end of the inner concave wall 222 to form a semi-open receiving space for accommodating the active member 240, so that the top of the active member 240 will not exceed the cover 220, to prevent the active member 240 from being triggered to rotate in an unexpected situation, thereby affecting the sealing performance of the product. Nevertheless, the increased handle 242 and the sedimentation plane 221 are not necessary for the active member 240. For example, as an optional alternative, the upper surface of the active member 240 is partially recessed downward to form a structure similar to a handle that is convenient for the user to twist; or a handle is hingedly provided on the active member 240, which is accommodated in a groove that matches its shape when it is not needed.

[0052] In addition to forming a semi-open receiving space for receiving the active member 240, the inner concave wall 222 also has a more critical function of further strengthening the sealing between the cover 220 and the inner wall of the container at the opening. Figure 3 , Figure 4 As shown, the sealing assembly 300 is further provided with a second deformable portion 340 located between the inner concave wall 222 and the inner wall of the container to form an interference fit, and the second deformable portion 340 is an integral structure with the first deformable portion 330. The deformation involved in the second deformable portion 340 refers to the compression deformation between the inner wall at the container opening and the inner concave wall 222, so the second deformable portion 340 will not be displaced with the movement of the first deformable portion 330. The second deformable portion 340 is based on a ring shape, and the outer side wall of the second deformable portion 340 preferably has a shape that matches the inner wall of the container at the opening, and the inner side wall of the second deformable portion 340 preferably has a shape that matches the inner side surface of the inner concave wall 222. The second deformable portion 340 can further be provided with some cavities or grooves, or a material with a smaller elastic modulus can be selected to further enhance the sealing performance by increasing the deformation amount.

[0053] As a further preferred embodiment, the cover 220 may further include an outer wall 223, and a top wall 224 connecting the inner concave wall 222 and the outer 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 an integral structure with the first deformation portion 330 and the second deformation portion 340. At this time, the outer wall 223, the container side wall at the opening, and the inner concave wall 222 form a parallel three-layer sandwich structure. The sealing assembly 300 further extends along the inner concave wall 222 toward the top wall 224, and further extends outward to form the third deformation portion 350 when reaching the top wall 224. The deformation of the third deformation portion 350 refers to the compression deformation between the outer edge of the container opening 120 and the top wall 224, which is used to further improve the sealing of the cover 220 at the opening. The outer 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 when closing the upper cover 200 on the container opening. When the upper cover of the prior art is closed on the container, the sealing effect may fail due to inaccurate sealing positioning.

[0054] As a further preferred embodiment, the opening 120 of the container 100 is a constricted opening, and the constricted opening 120 forms a space for accommodating the outer wall 223 to improve the integrity of the product appearance. This design can also prevent users from mistakenly thinking that they need to lift the outer wall 223 to open the upper cover 200.

[0055] It is worth noting that due to the design of the outer wall 223 and the third deformable portion 350 , the sealing assembly 300 is not easy to be disassembled for cleaning or replacement. To solve this problem, the third deformable portion 350 of the sealing assembly 300 is further provided with a tongue 360 ​​extending further to the outside of the outer wall 223 .

[0056] The following will describe the structure of the mutual movement of the active member 240 and the driven member 260 and their connection relationship. It should be noted that the scope of protection claimed by this application is not limited to this embodiment. As long as the existing technology that the driven member 260 can move in the vertical direction under the action of the active member 240 is within the protection scope of this application. As a preferred embodiment of the present application, the driven member 260 includes an inner sleeve 262 that is threadedly matched with the active member 240 to perform relative movement in the vertical direction, and a first limit mechanism that cooperates with the cover body 220 to limit the rotation of the driven member 260. Figure 4 It can be seen that the first limiting mechanism includes two limiting protrusions 225 extending from the lower surface of the cover body 220, and a limiting groove 265 provided on the upper surface of the driven member 260 and matching the shape of the limiting protrusions 225. When the active member 240 rotates relative to the cover body 220, the driven member 260 can move in the vertical direction, but will not rotate.

[0057] like Figure 6 , Figure 7 As shown, the inner sleeve 262 is provided with an internal thread 263. The internal thread 263 provided in this embodiment is a half-lead double-thread thread with a thread lead angle of 10-45°. The lifting action of the driven member 260 can be achieved by rotating the active member 240 180°. The blind end of the internal thread 263 is located at the lower position of the inner sleeve 262 and has a horizontal groove 264. Please refer to Figure 5 , and combined with Figure 3 As shown, a bolt-actuating member 244 which can pass through the cover body 220 and be inserted into the inner sleeve 262 is provided at the bottom of the active member 240, and a pair of protrusions 246 which cooperate with the inner thread 263 are provided on the side wall 310 of the bolt-actuating member 244. When the active member 240 rotates clockwise, the protrusion 246 moves from the upper part of the inner sleeve 262 along the inner thread 263 to the lower part, and gradually approaches the blind end, and at this time, the driven member 260 will move vertically from bottom to top accordingly. When the protrusion 246 slides to the horizontal groove 264 at the blind end, it will provide a stable upward supporting force for the horizontal groove 264 to prevent the driven member 260 from sliding down due to gravity. In addition, the driven member 260 can also be designed as a hollow structure to reduce its own weight, and the friction force of the rotational cooperation between the active member 240 and the cover body 220 can be increased. These designs can improve the "self-locking" performance of the driven member 260 and provide effective protection for the sealing performance.

[0058] like Figure 2 , Figure 3 As shown, after the bolt member 244 is inserted into the socket of the inner sleeve 262, an end cap 280 is installed at the end of the bolt member 244 to limit the maximum vertical distance between the active member 240 and the driven member 260. Specifically, when the active member 240 rotates counterclockwise, the protrusions 246 on both sides of the bolt member 244 move from the lower part of the inner sleeve 262 along the internal thread 263 to the upper part, and 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, and the maximum distance between the active member 240 and the driven member 260 is reached. Figure 7 As shown, a mounting hole 266 is provided at the bottom of the follower 260 for the end cover 280 to pass through, so as to achieve assembly.

[0059] The active member 240 must ensure that no vertical displacement occurs during rotation, so that the driven member 260 can be driven most efficiently. Figures 3 to 5As shown, an annular guide rail 226 that slidably cooperates with the active member 240 is provided on the cover body 220. A second limiting mechanism for limiting the movement of the active member 240 in the vertical direction can also be provided between the cover body 220 and the active member 240. The second limiting mechanism can include but is not limited to the annular guide rail 226. In this embodiment, the width of the annular guide rail 226 gradually widens along the height direction, and the bottom of the active member 240 is provided with a snap-fitting groove 248 that matches the shape of the annular guide rail 226, and the active member 240 can be pressed against the cover body 220 to snap-fit ​​the two. It should be understood that the method of ensuring the rotation of the active member while preventing vertical displacement is not limited to this, and there can be many optional methods, such as the active member can be embedded into the cover body from the side, or other intermediate members can be provided on the active member, and the intermediate member is fixedly matched with the cover body.

[0060] like Figure 2 , Figure 3 As shown, as a further optimization of this embodiment, a spring 267 in a compressed state can also be provided between the cover body 220 and the follower 260. More specifically, the spring 267 is sleeved on the inner sleeve 262 of the follower 260 and contacts the bottom surface of the cover body 220. This design is conducive to ensuring the overall appearance of the upper cover 200, so that there will be no shaking or swinging between the follower 260 and the active member 240. This design is also conducive to helping users to release the seal and open the upper cover more easily. The resilience of the spring enables the follower to move downward more efficiently, reducing the air volume in the container and thus reducing the vacuum, making it easier for users to open the container.

[0061] Example 2

[0062] This embodiment provides another way of matching the active member and the driven member: the driven member is provided with an inner sleeve, the inner sleeve is provided with an outer thread, and the active member is also provided with an outer sleeve, which has an inner thread that can mesh with the outer thread of the inner sleeve and perform thread self-locking. When the active member is rotated clockwise, the inner thread and the outer thread can be thread self-locked when the distance between the active member and the driven member is the smallest; after the thread is self-locked, the driven member will not rotate regardless of its own gravity or a smaller restoring force. When the active member is rotated counterclockwise with a larger force, the contact thread will be self-locked. Thread self-locking is a known method in mechanical design, and it can be achieved when the thread lead angle is less than or equal to the friction angle between the threads.

[0063] Furthermore, a threaded retaining ring or a similar structure may be provided at the top of the inner sleeve to limit the maximum distance between the active member and the driven member, thereby replacing the end cover design in Example 1.

[0064] This embodiment merely provides an alternative implementation of the cooperation between an active member and a driven member. Apart from this, other technical means, sealing components and sealing principles are based on the preferred implementation of Embodiment 1 or other optional methods.

[0065] Example 3

[0066] The above-mentioned embodiments 1 and 2 provide a driving mechanism in which the active member and the driven member are mainly threaded, and in this embodiment, the active member and the driven member are realized by pressing the fit. In addition, other technical means, sealing components and sealing principles are based on the preferred implementation of embodiment 1, or other optional methods.

[0067] The cover is disposed between the active member and the driven member, and at least one lever mechanism is disposed 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 active member. When the active member is pressed downward, the driven member moves upward under the action of the lever mechanism.

[0068] In order to prevent the driven member from falling downward, a push-type telescopic locking mechanism can be provided between the driving member and the cover body, which includes a ratchet mechanism and a reset spring. These structures and principles are exactly the same as the push-reset mechanism of a ballpoint pen.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

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

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

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 deformation portion.

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

5. A vacuum sealing device according to claim 4, characterized in that: The cover body includes an inner concave wall arranged on the inner side of the opening, and a subsidence 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 deformation portion disposed between the inner concave wall and the container side wall to form an interference fit.

7. A vacuum sealing device according to claim 5, characterized in that: The cover body includes an outer edge wall arranged 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 also 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 an integral structure.

10. A vacuum sealed device according to claim 1, characterized in that: The driven member comprises an inner sleeve which is threadably matched with the driving member to enable relative movement in a vertical direction, and a first limiting mechanism which is matched with the cover body to limit the rotation of the driven member.

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

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

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

14. A vacuum sealed device according to claim 1, characterized in that: The cover body is provided with an annular guide rail which is slidably matched with the active member, and a second limiting mechanism which limits the active member from moving in a vertical direction.

15. A vacuum sealed device according to claim 1, characterized in that: A spring in a compressed state is arranged between the cover body and the follower.

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