Vacuum expansion structure, cover, vacuum preservation device and refrigeration equipment

Abstract

The present invention relates to a vacuum expansion structure, a cover, a vacuum preservation device and a refrigeration device, and relates to the technical field of fresh-keeping containers. It solves the problem in the prior art that a fresh-keeping box is provided on the door of a refrigerator, and a vacuum pump is embedded in the foam layer of the door to evacuate the fresh-keeping box, which is inconvenient to operate. The vacuum expansion structure cover is provided on the box body, and includes an operating panel, an eccentric wheel assembly and a sealing deformation assembly. The sealing deformation assembly is provided on the side of the operating panel facing the box body, and a variable volume cavity is formed between the sealing deformation assembly and the box body. A lifting portion is formed on the sealing deformation assembly, and the lifting portion can pass through the operating panel and be connected to the eccentric wheel assembly thereon. External force can drive the eccentric wheel assembly to move between an initial position and a jacking position, and the eccentric wheel assembly in the jacking position can drive the sealing deformation assembly to deform toward the operating panel through the lifting portion to change the volume of the variable volume cavity, thereby playing the role of vacuum negative pressure in the fresh-keeping box.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping containers, and in particular to a vacuum expansion structure, a cover, a vacuum fresh-keeping device and a refrigeration device. Background Art

[0002] With the continuous development of society and the continuous improvement of people's living standards, the requirements for food preservation are also increasing. The low-temperature storage method of placing food directly in the refrigerator can no longer meet people's needs for food preservation.

[0003] Currently, the more common ways to preserve food in refrigerators on the market include the refrigerator’s own preservation functions such as instant freezing, tender freezing, and one-week freshness. Most of these methods are installed on mid- to high-end refrigerators.

[0004] In the past two years, a new type of fresh-keeping method has been introduced on the refrigerator market - vacuum preservation. This method is to design and fix a fresh-keeping box on the refrigerator door, including a box body and a lid. A vacuum pump is embedded in the foam layer of the door. When the vacuum fresh-keeping box is needed, the space formed between the box body and the lid is vacuumed by the vacuum pump. This is inconvenient to operate and carry. In addition, this method requires the addition of a vacuum pump and the design of a special fresh-keeping box installation position on the door, and the addition of injection molded parts and other materials for embedding the vacuum pump, which is not conducive to the popularization of all refrigerator products. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a vacuum expansion structure, a cover, a vacuum preservation device and a refrigeration equipment to solve the technical problem in the prior art that the vacuum preservation type is to set a fresh-keeping box on the refrigerator door, and to vacuum the fresh-keeping box by pre-embedding a vacuum pump in the foam layer of the door, which is inconvenient to operate.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] According to a first aspect of an embodiment of the present invention, a vacuum expansion structure is provided, comprising an eccentric wheel assembly and a sealing deformation assembly, wherein the vacuum expansion structure is sealed at the opening of a box body through the sealing deformation assembly, the eccentric wheel assembly can move between an initial position and a jacking position, and the eccentric wheel assembly in the jacking position can drive the sealing deformation assembly to deform so as to increase the volume of the space between the sealing deformation assembly and the box body.

[0008] Furthermore, the eccentric wheel assembly includes an eccentric wheel body and an operating disk, the sealing deformation assembly is arranged on the side of the operating disk facing the box body and a variable volume chamber is formed between the sealing deformation assembly and the box body, a lifting portion is formed on the sealing deformation assembly and the lifting portion can pass through the operating disk and be connected to the eccentric wheel assembly thereon, and the eccentric wheel assembly in the jacking position can drive the sealing deformation assembly to deform toward the operating disk through the lifting portion.

[0009] Furthermore, the eccentric wheel body includes a shaft, an eccentric wheel mounted on the shaft, and a transmission component that cooperates with the eccentric wheel. The transmission component is mounted on the operating disk, and the eccentric wheel is connected to the lifting part through the shaft. There is a force-applying part on the transmission component, and the force-applying part can push the transmission component to move relative to the operating disk and the transmission component can drive the eccentric wheel to rotate between an initial position and a lifting position.

[0010] Furthermore, the operating panel is provided with a mounting portion for mounting the transmission component, the transmission component cooperates with the mounting portion and a locking structure is provided between the transmission component and the mounting portion, the transmission component has a locked state and an unlocked state, the transmission component in the locked state can be locked on the mounting portion by the locking structure to limit the rotation position of the eccentric wheel, and the transmission component in the unlocked state can move relative to the mounting portion under the push of an external force.

[0011] Furthermore, the locking structure includes a first engaging member and a second engaging member, the first engaging member is mounted on the transmission component, the second engaging member is mounted on the mounting portion, and the first engaging member can be locked and unlocked relative to the second engaging member.

[0012] Furthermore, the operating panel includes a panel body, the mounting portion is fixedly provided on the panel body, a neck portion is convexly provided on the side of the panel body facing away from the mounting portion and extends to the inside of the box body, the sealing deformation component is arranged on the neck portion and a sealed connection is formed between the operating panel and the inner wall of the box body through the sealing deformation component, and a through hole is provided on the panel body to allow the lifting portion of the sealing deformation component to pass through.

[0013] Furthermore, the sealing deformation component includes an elastic sealing pad and the lifting part, the elastic sealing pad is sleeved on the periphery of the shrinkage neck part, one end of the lifting part is fixedly connected to the elastic sealing pad, and the other end is connected to the shaft body through the through hole, and a compression chamber with adjustable volume is formed between the elastic sealing pad and the operating disk.

[0014] Furthermore, the elastic sealing gasket includes a sealing gasket body and a support seat body, the support seat body is fixedly connected to the lifting part, the support seat body is arranged at the bottom of the sealing gasket body and a through hole is opened on the sealing gasket body to allow the lifting part to extend into the compression chamber, and the lifting part can drive the sealing gasket body to deform through the support seat body.

[0015] Furthermore, an elastic element is provided on the periphery of the telescopic section of the lifting portion located between the sealing gasket body and the disc body.

[0016] Furthermore, there are four eccentric wheels, all of which are connected through the shaft, and the transmission component includes two sets of engaging parts arranged opposite to each other, each set of engaging parts includes two gear bars, and each eccentric wheel is engaged with the corresponding gear bar.

[0017] Furthermore, the vacuum expansion structure also includes a pair of relatively arranged handle portions, and the two gear bars on each set of meshing parts are fixedly connected through a connecting portion. There is a force-applying portion on the connecting portion, and the handle portion is installed at the corresponding force-applying portion. External force can act on the corresponding force-applying portion through the handle portion to drive the corresponding gear bar to move.

[0018] According to a second aspect of the embodiments of the present invention, a cover is provided, comprising the vacuum expansion structure.

[0019] Furthermore, the cover body also includes an upper cover, and the upper cover is buckled on the top of the eccentric wheel assembly.

[0020] According to a third aspect of an embodiment of the present invention, a vacuum preservation device is provided, comprising a box body and a cover body, wherein the cover body is the above-mentioned cover body, and the cover body and the box body are sealed by the sealing deformation assembly.

[0021] According to a fourth aspect of an embodiment of the present invention, a refrigeration device is provided, comprising a device body and a vacuum preservation device, wherein the vacuum preservation device is the above-mentioned vacuum preservation device, and the vacuum preservation device is placed inside the device body.

[0022] The vacuum expansion structure provided by the present invention utilizes a mechanical principle—the eccentric wheel principle. External force can propel the eccentric wheel assembly between an initial position and a raised position. When the eccentric wheel assembly is in the initial position, the volume of the space formed between the sealing deformation assembly and the box body does not change, and no vacuum effect is achieved. When the eccentric wheel assembly is in the raised position, it can drive the sealing deformation assembly to deform, thereby increasing the volume of the space formed between the sealing deformation assembly and the box body. This in turn causes the vacuum degree within the box body to decrease as the volume increases, thereby creating a vacuum negative pressure in the fresh-keeping box. Furthermore, there is no need to rely on an additional vacuum pump to evacuate the fresh-keeping box. This eccentric wheel-type expansion method is easy to operate and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 is a cross-sectional view of a vacuum expansion structure in a non-working state provided by an embodiment of the present invention;

[0025] Figure 2 2. It is a top view of the vacuum expansion structure provided by an embodiment of the present invention in a non-working state;

[0026] Figure 3 is a cross-sectional view of a vacuum expansion structure in a working state provided by an embodiment of the present invention;

[0027] Figure 4 This is a top view of the vacuum expansion structure provided by an embodiment of the present invention in a working state;

[0028] Figure 5 1 is a schematic structural diagram of an eccentric wheel provided in an embodiment of the present invention;

[0029] Figure 6 1 is a schematic structural diagram of a support base and a lifting portion provided by an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of a vacuum expansion structure provided by an embodiment of the present invention;

[0031] Figure 8 Schematic diagram of the structure of a vacuum preservation device provided by an embodiment of the present invention;

[0032] Figure 9 This is an exploded view of the structure of the vacuum preservation device provided by an embodiment of the present invention;

[0033] Figure 10 1 is a diagram showing the relationship between volume and air pressure according to an embodiment of the present invention.

[0034] In the figure: 1. Box body; 2. Operating panel; 21. Panel body; 22. Shrinkage neck; 23. Mounting portion; 3. Eccentric wheel body; 31. Shaft; 32. Eccentric wheel; 33. Transmission component; 4. Sealing deformation assembly; 41. Lifting portion; 42. Sealing pad body; 43. Support seat; 5. Variable volume chamber; 6. Compression chamber; 7. First engaging member; 8. Second engaging member; 81. Hook portion; 82. Unlocking portion; 83. Slot; 9. Elastic element; 10. Handle portion; 11. Upper cover. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0036] See also Figures 1 to 7 The present invention provides a vacuum expansion structure, including an eccentric wheel assembly and a sealing deformation assembly 4. The vacuum expansion structure is sealed at the opening of the box body 1 through the sealing deformation assembly 4. The eccentric wheel assembly can move between an initial position and a jacking position, and the eccentric wheel assembly in the jacking position can drive the sealing deformation assembly 4 to deform to increase the volume of the space between the sealing deformation assembly 4 and the box body 1.

[0037] Among them, the eccentric wheel assembly includes an eccentric wheel body 3 and an operating disk 2, the sealing deformation assembly 4 is arranged on the side of the operating disk 2 facing the box body 1, and a variable volume chamber 5 is formed between the sealing deformation assembly 4 and the box body 1, a lifting portion 41 is formed on the sealing deformation assembly 4, and the lifting portion 41 can pass through the operating disk 2 and be connected to the eccentric wheel body 3 thereon, and external force can drive the eccentric wheel body 3 to move between the initial position and the jacking position, and the eccentric wheel body 3 in the jacking position can drive the sealing deformation assembly 4 to deform toward the operating disk 2 through the lifting portion 41 to change the volume of the variable volume chamber 5.

[0038] like Figure 1As shown, the eccentric wheel body 3 in this embodiment includes a shaft body 31, an eccentric wheel 32 installed on the shaft body 31, and a transmission component 33 that cooperates with the eccentric wheel 32. The transmission component 33 is installed on the operating disk 2, and the eccentric wheel 32 is connected to the lifting part 41 through the shaft body 31. There is a force-applying part on the transmission component 33. When external force acts on the force-applying part, the force-applying part can push the transmission component 33 to move relative to the operating disk 2, and the transmission component 33 can drive the eccentric wheel 32 to rotate between the initial position and the jacking position.

[0039] This embodiment utilizes the mechanical principle - the eccentric wheel 32 principle. External force can push the transmission component 33 to drive the eccentric wheel 32 to rotate between the initial position and the jacking position. When the eccentric wheel body 3 is in the initial position, the volume of the variable volume chamber 5 formed between the sealing deformation component 4 and the box body 1 does not change, that is, no vacuum effect is played at this time; when the eccentric wheel body 3 is in the jacking position, it can drive the sealing deformation component 4 to deform toward the operating disk 2 through the lifting part 41, thereby reducing the volume between the sealing deformation component 4 and the operating disk 2, and increasing the volume of the variable volume chamber 5 formed between the sealing deformation component 4 and the box body 1, thereby reducing the vacuum degree in the box as the volume of the variable volume chamber 5 increases, thereby achieving the purpose of preservation.

[0040] In this embodiment, a mounting portion 23 for mounting a transmission component 33 is provided on the operating panel 2. The transmission component 33 cooperates with the mounting portion 23, and the transmission component 33 can move relative to the mounting portion 23 under the push of an external force. In order to ensure the stability of the vacuum degree in the box body 1, a locking structure is provided between the transmission component 33 and the mounting portion 23. The transmission component 33 in this embodiment has a locked state and an unlocked state. The transmission component 33 in the unlocked state can move relative to the mounting portion 23 under the push of an external force. When the transmission component 33 moves to a preset position, it can be moved and positioned relative to the mounting portion 23 by the locking structure. In other words, the transmission component 33 in the locked state can be locked to the mounting portion 23 by the locking structure, which is used to limit the rotation position of the eccentric wheel 32, achieve a locking effect, and ensure the stability of the vacuum degree in the variable volume chamber 5 between the box body 1 and the sealing deformation component 4.

[0041] In the specific implementation process of the embodiment of the present invention, the eccentric wheel 32 is provided with four, Figure 5 Figure 3 is a structural diagram of the eccentric wheel 32. In this embodiment, the maximum stroke of the eccentric wheel 32 is 10 mm. When the eccentric wheel 32 is at its maximum stroke, the sealing gasket body 42 at the bottom of the vacuum expansion structure is lifted, creating a negative pressure inside the box body 1. All eccentric wheels 32 are connected by a shaft 31. The transmission component 33 includes two sets of meshing members arranged opposite each other, each set of meshing members including two gears, and each eccentric wheel 32 meshes with a corresponding gear.

[0042] To further save effort, the vacuum expansion structure also includes a pair of opposing handles 10. The two gears on each set of meshing members are fixedly connected by a connecting portion. The connecting portion has a force-applying area, and the handle 10 is mounted on the corresponding force-applying area. Here, the handle 10 can be detachably fixed to the connecting portion using a snap-fit ​​connection, facilitating user operation. External force can be applied to the corresponding force-applying area through the handle 10, driving the corresponding gear to move.

[0043] The locking structure in this embodiment includes a first engaging member and a second engaging member 8. The first engaging member is mounted on the transmission component 33, and the second engaging member 8 is mounted on the mounting portion 23. The first engaging member can be locked and unlocked relative to the second engaging member 8. Figure 7 As shown, the first engaging member is provided with a buckle. By pushing the gear bars on the two sets of meshing members in opposite directions through the handle 10, the buckle on the first engaging member is engaged with the slot 83 on the second engaging member 8, that is, the gear bar buckle is fixed to the buckle on the operating panel 2, thereby locking the eccentric wheel 32 and locking the vacuum degree in the fresh-keeping box to achieve the effect of preserving fresh food. Continuing to push the gear bar in the opposite direction can trigger the locking structure to release its lock on the transmission component 33. Figure 7 The second engaging member 8 includes a hook portion 81 and an unlocking portion 82, and the above-mentioned slot 83 is formed between the hook portion 81 and the unlocking portion 82. When the gear bar moves in the relative direction, the buckle on the first engaging member on it can engage with the slot 83 on the second engaging member 8. When the gear bar is continued to be pushed in the relative direction, the buckle on the first engaging member can cooperate with the unlocking portion 82, and the unlocking portion 82 can pop the buckle on the first engaging member out of the slot 83, thereby unlocking the transmission component 33 and switching to the unlocked state.

[0044] As an optional embodiment, the operating panel 2 includes a panel body 21 with a mounting portion 23 fixedly disposed thereon. A constricted portion 22 extending into the interior of the housing 1 is protruded from the side of the panel body 21 facing away from the mounting portion 23. A sealing deformable assembly 4 is disposed on the constricted portion 22, forming a sealed connection between the operating panel 2 and the inner wall of the housing 1, eliminating the need for a conventional sealing ring. A through-hole is provided in the panel body 21 to allow the lifting portion 41 of the sealing deformable assembly 4 to pass through.

[0045] The sealing deformation component 4 includes an elastic sealing pad and a lifting portion 41. The elastic sealing pad is sleeved on the outer periphery of the shrinkage neck portion 22. One end of the lifting portion 41 is fixedly connected to the elastic sealing pad, and the other end is connected to the shaft body 31 through a through hole. A compression chamber 6 with adjustable volume is formed between the elastic sealing pad and the operating disk 2.

[0046] The elastic sealing pad includes a sealing pad body 42 and a supporting seat body 43. Figure 6As shown, the support seat 43 is fixedly connected to the lifting portion 41. The support seat 43 is arranged at the bottom of the sealing gasket body 42, and the sealing gasket body 42 is provided with a through-hole that allows the lifting portion 41 to extend into the compression chamber 6. The handle portion 10 can drive the gears on both sides of the shaft 31 to move in opposite directions. The gears engage with the corresponding eccentric wheels 32. The eccentric wheels 32 can drive the lifting portion 41 to move upward through the shaft 31. The lifting portion 41 can also drive the sealing gasket body 42 to deform upward through the support seat 43. As a result, the volume between the sealing deformation component 4 and the operating disk 2 is reduced, and the volume of the variable volume chamber 5 formed between the sealing deformation component 4 and the box body 1 is increased.

[0047] from Figure 1 and Figure 3 The different structures of the vacuum expansion structure in the non-working state and the working state can be seen more clearly.

[0048] Figure 1 In the figure, the non-working state of the vacuum expansion structure (before expansion) can be seen. The eccentric wheel 32 in the figure is in the initial position, the lowest point of the eccentric wheel 32 is matched with the gear bar, the eccentric wheel 32 has no stroke, and the volume in the box body 1 remains unchanged. At this time, no expansion effect is played, that is, no vacuum effect is played. Figure 2 In this state, the gear bar buckle is separated from the slot 83 on the operating panel 2 .

[0049] Figure 3 In the figure, you can see the working state of the vacuum expansion structure (after expansion). The eccentric wheel 32 is in the jacking position, and the highest point of the eccentric wheel 32 cooperates with the gear bar. At this time, the stroke is the largest (10mm height distance compared with the previous operation). The sealing gasket body 42 at the bottom of the vacuum expansion structure is lifted up by the eccentric wheel 32, and the volume inside the box body 1 is expanded and the pressure is reduced, thereby playing a role of expanding the negative pressure, that is, playing a role of vacuuming; at this time, the gear bar buckle cooperates with the card slot 83 on the operating panel 2 to form a stopper to ensure that the vacuum degree inside the box body 1 remains unchanged. Figure 4 To this end, when the eccentric wheel 32 is in the maximum stroke state, the gear bar buckle is in the state of the operating disk 2 slot 83. At this time, the two components are in a locked and fastened state, fixing the gear bar buckle on the operating disk 2 slot 83, and then locking the eccentric wheel 32 to ensure that the vacuum degree in the fresh-keeping box achieves the effect of preserving freshness.

[0050] In this embodiment, the sealing gasket body 42 is made of rubber. To assist the sealing gasket body 42 in rebounding after deformation, an elastic element 9 (spring) is provided around the expansion section of the lifting portion 41 between the sealing gasket body 42 and the disc body 21. In this embodiment, the edge of the sealing gasket body 42 can be bonded to the constricted portion 22 using adhesive.

[0051] The present invention further provides a cover body, which includes the vacuum expansion structure described in any one of the above embodiments.

[0052] like Figure 9 As shown, the cover also includes an upper cover 11, which snaps onto the operating panel 2, with the eccentric wheel body 3 disposed between them. The upper cover 11 shields the vacuum expansion mechanism, preventing dust from directly falling onto it, facilitating cleaning and enhancing the overall appearance. The cover is internally designed with an eccentric wheel body 3, which utilizes the eccentric wheel 32 to drive the expansion structure of the sealing deformation assembly 4, thereby increasing the internal volume of the box body 1 and achieving the purpose of vacuum preservation.

[0053] See also Figure 8 The present invention also provides a vacuum preservation device comprising a box body 1 and a cover, wherein the cover is any of the above-described embodiments, and the cover and box body 1 are sealed by a sealing deformable component 4. The edges of the sealing deformable component 4 are clamped and sealed by the outer periphery of the cover and the inner wall of the box body 1. Because the locking structure locks the gear bar, the gear bar cannot move further, thereby maintaining the deformed state of the sealing deformable component 4 and, in turn, maintaining the negative pressure within the box body 1.

[0054] In this embodiment, the sealing deformable component 4 is disposed between the sidewalls of the lid and the sidewalls of the box body 1, sealingly isolating the interior spaces of the box body 1 and the lid into two compartments. When the interior of the box body 1 is under negative pressure, the sealing deformable component 4 must maintain a stable seal with the sidewalls of the box body 1 to prevent air leakage.

[0055] The present invention provides a volume-expanding vacuum preservation device with a brand-new structural design. It utilizes the mechanical principle - the eccentric wheel 32 principle to control the vacuum degree in the box body 1 as the volume of the variable volume chamber 5 increases, and the volume of the variable volume chamber 5 increases as the eccentric wheel 32 and the transmission component 33 move. When the wheelbase of the eccentric wheel 32 is at its maximum, the lifting portion 41 lifts the bottom elastic sealing gasket upward, thereby reducing the volume of the compression chamber 6 between the elastic sealing gasket and the operating panel 2, and increasing the volume of the variable volume chamber 5 in the vacuum preservation device, thereby achieving a vacuum negative pressure in the vacuum preservation device.

[0056] The present invention also provides a refrigeration device, including a device body and the above-mentioned vacuum preservation device. In this embodiment, the refrigeration device is a refrigerator, and the vacuum preservation device is a fresh-keeping box. The fresh-keeping box is placed inside the refrigerator for preservation.

[0057] The air pressure inside the fresh-keeping box varies with the volume of the items contained. In this embodiment, the designed volume of the box body 1 is 3189ml, and the expanded volume caused by the deformation of the sealing deformation component 4 is 91.5ml. The relationship between the volume occupied by the items in the box body 1, the remaining volume in the box body 1, and the air pressure reached after the expansion is shown in the following table:

[0058]

[0059]

[0060] In addition, from Figure 10 You can see the relationship between volume and air pressure.

[0061] The fresh-keeping box does not need to be attached to any part of the refrigerator, and does not require related control components. Through the principle of the mechanical eccentric wheel 32, the vacuum degree in the box body 1 decreases as the mechanical movement of the eccentric wheel 32 increases the volume of the fresh-keeping box (the volume of the variable volume chamber 5), and when the eccentric wheel 32 moves to the extreme position, it has a self-locking function to ensure the stability of the vacuum degree in the fresh-keeping box. The eccentric wheel 32 expansion method can ensure that the user can push the handle part 10 very labor-savingly to perform the expansion operation, and the degree of realization is relatively high. As a fresh-keeping box used in a refrigerator, after being placed in the refrigerator's cold storage room, the vacuum degree can continue to decrease as the temperature drops, ensuring that the fresh-keeping box has a good vacuum preservation effect. It can meet the characteristics of various refrigerators and meet the user's vacuum preservation needs.

[0062] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A vacuum expansion structure, characterized in that: The vacuum expansion structure comprises an eccentric wheel assembly and a sealing deformation assembly, wherein the vacuum expansion structure is sealed at the opening of the box body through the sealing deformation assembly. The eccentric wheel assembly can move between an initial position and a jacking position. When the eccentric wheel assembly is in the jacking position, it can drive the sealing deformation assembly to deform so as to increase the volume of the space between the sealing deformation assembly and the box body. The eccentric wheel assembly includes an eccentric wheel body and an operating disk, the sealing deformation assembly is arranged on the side of the operating disk facing the box body, and a variable volume chamber is formed between the sealing deformation assembly and the box body, a lifting portion is formed on the sealing deformation assembly, and the lifting portion can pass through the operating disk and be connected to the eccentric wheel assembly thereon, and the eccentric wheel assembly in the jacking position can drive the sealing deformation assembly to deform toward the operating disk through the lifting portion; The eccentric wheel body includes a shaft, an eccentric wheel mounted on the shaft, and a transmission component that cooperates with the eccentric wheel. The transmission component is mounted on the operating disk. The eccentric wheel is connected to the lifting part through the shaft. There is a force-applying part on the transmission component, and the force-applying part can push the transmission component to move relative to the operating disk and the transmission component can drive the eccentric wheel to rotate between an initial position and a lifting position.

2. The vacuum expansion structure according to claim 1, characterized in that: The operating panel is provided with a mounting portion for mounting the transmission component, the transmission component cooperates with the mounting portion and a locking structure is provided between the transmission component and the mounting portion, the transmission component has a locked state and an unlocked state, the transmission component in the locked state can be locked on the mounting portion by the locking structure to limit the rotation position of the eccentric wheel, and the transmission component in the unlocked state can move relative to the mounting portion under the push of an external force.

3. The vacuum expansion structure according to claim 2, characterized in that: The locking structure includes a first engaging member and a second engaging member. The first engaging member is mounted on the transmission component, and the second engaging member is mounted on the mounting portion. The first engaging member can be locked and unlocked relative to the second engaging member.

4. The vacuum expansion structure according to claim 2, characterized in that: The operating panel includes a panel body, the mounting portion is fixedly provided on the panel body, a neck portion extending to the inside of the box body is convexly provided on the side of the panel body facing away from the mounting portion, the sealing deformation component is provided on the neck portion and a sealed connection is formed between the operating panel and the inner wall of the box body through the sealing deformation component, and a through hole is provided on the panel body to allow the lifting portion of the sealing deformation component to pass through.

5. The vacuum expansion structure according to claim 4, characterized in that: The sealing deformation component includes an elastic sealing pad and the lifting part. The elastic sealing pad is sleeved on the outer periphery of the shrinkage neck part. One end of the lifting part is fixedly connected to the elastic sealing pad, and the other end is connected to the shaft body through the through hole. A compression chamber with adjustable volume is formed between the elastic sealing pad and the operating disk.

6. The vacuum expansion structure according to claim 5, characterized in that: The elastic sealing gasket includes a sealing gasket body and a support seat body, the support seat body is fixedly connected to the lifting part, the support seat body is arranged at the bottom of the sealing gasket body and a through hole is opened on the sealing gasket body to allow the lifting part to extend into the compression chamber, and the lifting part can drive the sealing gasket body to deform through the support seat body.

7. The vacuum expansion structure according to claim 6, characterized in that: An elastic element is provided on the periphery of the telescopic section of the lifting portion located between the sealing pad body and the disc body.

8. The vacuum expansion structure according to claim 1, characterized in that: There are four eccentric wheels, all of which are connected through the shaft. The transmission component includes two sets of engaging parts arranged opposite to each other, each set of engaging parts includes two gear bars, and each eccentric wheel is engaged with the corresponding gear bar.

9. The vacuum expansion structure according to claim 8, characterized in that: The vacuum expansion structure also includes a pair of handles arranged opposite to each other, and the two gear bars on each set of meshing parts are fixedly connected by a connecting portion. There is a force-applying portion on the connecting portion, and the handle is installed at the corresponding force-applying portion. External force can act on the corresponding force-applying portion through the handle to drive the corresponding gear bar to move.

10. A cover, characterized in that: It comprises the vacuum expansion structure according to any one of claims 1 to 9.

11. The cover according to claim 10, wherein: The cover body further comprises an upper cover, and the upper cover is buckled on the upper part of the eccentric wheel assembly.

12. A vacuum preservation device, characterized in that: It comprises a box body and a cover body, wherein the cover body is the cover body according to claim 10 or 11, and the cover body and the box body are sealed by the sealing deformation component.

13. A refrigeration device, characterized in that: It comprises an equipment body and a vacuum preservation device, wherein the vacuum preservation device is the vacuum preservation device according to claim 12, and the vacuum preservation device is placed inside the equipment body.

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