Vacuum storage box

Abstract

The present invention discloses a vacuum fresh-keeping box, comprising: a box body; a box lid; a button, the button being movably arranged on the box lid and located in a mounting groove, a transition chamber being formed between the button and the inner wall of the mounting groove, and the volume of the transition chamber being changed during movement of the button; the transition chamber being connected to the accommodating chamber via an air extraction port, and the one-way flow direction of the one-way valve being from the accommodating chamber to the transition chamber; a sealing member, the sealing member being capable of sealing the exhaust gap between the button and the side wall of the mounting groove, and the button driving the sealing member to move during movement; when the button moves to reduce the volume of the transition chamber, the sealing member opens the exhaust gap between the button and the side wall of the mounting groove to allow external air to communicate with the transition chamber; and when the button moves to expand the volume of the transition chamber, the sealing member seals the exhaust gap between the button and the side wall of the mounting groove to isolate external air from the transition chamber. The vacuum fresh-keeping box of the present invention effectively solves the problem of complex structure of vacuum fresh-keeping boxes in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum fresh-keeping boxes, in particular to a vacuum fresh-keeping box. Background Art

[0002] With the continuous progress of society and the continuous improvement of people's living standards, vacuum storage boxes, as a new and convenient preservation device, are increasingly used by people and are constantly entering the daily lives of more and more people.

[0003] Vacuum containers effectively extend the shelf life of food by preventing it from oxidation, mold, insect damage, decay, and moisture. They also preserve the original flavor and nutritional value of food. Furthermore, the container's material is healthy and harmless, and its transparency allows for a clear view of the food inside, making it easy to check its freshness.

[0004] Existing vacuum fresh-keeping boxes generally use a vacuum pump to extract air from the box to reduce the vacuum level of the box, thereby achieving the purpose of preserving food. However, in order to use the vacuum fresh-keeping box, an electric or manual vacuum pump must be carried to achieve the purpose of being able to use it at any time.

[0005] At present, some vacuum storage boxes in the prior art use a vacuuming method that performs vacuuming successively by alternately opening and closing multiple one-way valves. However, this structure has many parts and uses a large number of one-way valves, which makes the parts assembly structure complex and the assembly structure easily deformed and ineffective.

[0006] In summary, the structure of the vacuum fresh-keeping box in the prior art is complicated. Summary of the Invention

[0007] The embodiment of the present invention provides a vacuum fresh-keeping box to solve the problem of complex structure of the vacuum fresh-keeping box in the prior art.

[0008] To achieve the above-mentioned purpose, the present invention provides a vacuum preservation box, comprising: a box body, having a accommodating cavity; a box cover, the box cover is arranged on the box body and seals the accommodating cavity; an air extraction port is provided on the box cover, the air extraction port is communicated with the accommodating cavity, and a one-way valve is provided at the air extraction port; the box cover is provided with a mounting groove; a button, the button is movably arranged on the box cover and located in the mounting groove, a transition cavity is formed between the button and the inner wall of the mounting groove, and the button changes the volume of the transition cavity during movement; the transition cavity is communicated with the accommodating cavity through the air extraction port, and the one-way flow direction of the one-way valve is For the flow from the accommodating cavity to the transition cavity; a sealing member, the sealing member is movably installed in the limiting groove of the button, the sealing member can seal the exhaust gap between the button and the side wall of the installation groove, and the button drives the sealing member to move during the movement; when the button moves to reduce the volume of the transition cavity, the sealing member opens the exhaust gap between the button and the side wall of the installation groove to allow external air to communicate with the transition cavity; when the button moves to expand the volume of the transition cavity, the sealing member seals the exhaust gap between the button and the side wall of the installation groove to isolate external air from the transition cavity.

[0009] Furthermore, the limiting groove of the button has a first limiting inner wall and a second limiting inner wall that are relatively arranged; the spacing direction of the first limiting inner wall and the second limiting inner wall is consistent with the movement direction of the button, the first limiting inner wall faces the transition chamber, and the second limiting inner wall faces the external space; an airflow gap connected to the external air is formed between the seal and the button; when the button moves to reduce the volume of the transition chamber, the seal abuts against the first limiting inner wall and moves away from the second limiting inner wall, and the airflow gap is connected to the opened exhaust gap; when the button moves to expand the volume of the transition chamber, the seal abuts against the second limiting inner wall and moves away from the second limiting inner wall, and the seal simultaneously seals the exhaust gap.

[0010] Furthermore, the button includes: a top cover, which is used for operation, and the top cover has a first limiting plate, and the first limiting plate has the first limiting inner wall; a support seat, which is movably arranged in the mounting groove, and the support seat has a second limiting plate, and the second limiting plate has the second limiting inner wall; the top cover is fixedly connected to the support seat, and the limiting groove is formed between the first limiting plate and the second limiting plate.

[0011] Furthermore, the exhaust gap is formed between the outer periphery of the support seat and the side wall of the installation groove.

[0012] Furthermore, a plurality of limiting protrusions are connected to the first limiting plate, and the limiting protrusions form the bottom wall of the limiting groove; and the first limiting plate is provided with airflow gaps at the positions of the limiting protrusions.

[0013] Furthermore, it also includes an elastic return member, which is connected between the support seat and the box cover; when the button moves to reduce the volume of the transition cavity, the elastic return member is compressed; the elastic return member applies an elastic force in the direction of movement of the button to expand the volume of the transition cavity.

[0014] Furthermore, the elastic return member is arranged in the transition cavity, and the elastic return member is a spring.

[0015] Furthermore, the top cover and the support seat are fixedly connected by pressure-fusion welding; or, the top cover and the support seat are an integrally formed structure.

[0016] Furthermore, the limiting groove is arranged to correspond to the structural shape of the installation groove, the limiting groove is an annular groove, and the sealing member is an annular sealing ring.

[0017] Furthermore, a balancing valve is provided on the box cover, and the balancing valve is used to connect or isolate the accommodating cavity from the external air.

[0018] Furthermore, the outer periphery of the box cover is limitedly connected with a deformable sealing structure; when the box cover is arranged on the box body, the deformable sealing structure is located between the box cover and the box body and deforms to seal the accommodating cavity.

[0019] When the button is pressed, it moves to reduce the volume of the transition chamber. Due to friction between the seal and the sidewalls of the mounting groove, the seal deflects upward relative to the button and is stopped by the button's retaining groove. The retaining groove prevents the seal from deflecting too much and retaining contact with the button. The retaining groove also pulls the seal along with the button, opening the air gap between the button and the sidewalls of the mounting groove. Simultaneously, the one-way valve is compressed by atmospheric pressure, forcing the air in the transition chamber into the outside air as the button is pressed downward.

[0020] During the button reset process, the button moves, expanding the volume of the transition chamber. The seal, due to friction with the sidewalls of the mounting slot, deflects downward relative to the button and squeezes into the venting gap between the button and the sidewalls of the mounting slot, sealing the venting gap. During the button reset, the stopper continues to pull the seal and simultaneously seal the venting gap. As the button moves upward from its lowest point, the air pressure within the transition chamber is lower than that within the receiving chamber. The one-way valve is lifted by the pressurized air in the receiving chamber, and the air within the receiving chamber is drawn out into the transition chamber as the button resets. This continuous deflection and reset of the button seal achieves the same one-way air flow function as a one-way valve. However, the vacuum container of the present invention eliminates the need for a one-way valve, significantly simplifying the components of the exhaust system and reducing the total number of parts in the lid assembly, resulting in a simpler structure. The simple structure of the present invention makes assembly, maintenance, and disassembly more efficient while preventing deformation and failure of the assembly structure. This addresses the complex structure of vacuum containers in the prior art and the associated challenges. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the internal structure of a vacuum fresh-keeping container according to an embodiment of the present invention;

[0022] Figure 2 1 is a schematic diagram of the structure coordination when the button of the vacuum fresh-keeping container according to an embodiment of the present invention is pressed;

[0023] Figure 3 1. It is a schematic diagram of the structure coordination when the button of the vacuum fresh-keeping box according to an embodiment of the present invention is reset;

[0024] Figure 4 1 is a schematic diagram of the exploded structure of the button, sealing member and elastic reset member of the vacuum fresh-keeping container according to an embodiment of the present invention;

[0025] Figure 5 1 is a schematic diagram of the structure of the lid of the vacuum fresh-keeping box according to an embodiment of the present invention;

[0026] Figure 6 2. It is a schematic diagram of the structure coordination of the balancing valve of the vacuum fresh-keeping container in the embodiment of the present invention in the isolation state;

[0027] Figure 7 1. It is a schematic diagram of the structure coordination of the balance valve of the vacuum fresh-keeping container in the embodiment of the present invention in the connected state;

[0028] Figure 8 1 is a schematic diagram of the structural coordination of the deformable sealing structure of the vacuum preservation container according to an embodiment of the present invention when the deformable sealing structure is not deformed;

[0029] Figure 9 Schematic diagram of the structural coordination of the deformable sealing structure of the vacuum preservation container according to an embodiment of the present invention after deformation;

[0030] Figure 10 1 is a schematic structural diagram of a vacuum fresh-keeping container in an open state according to an embodiment of the present invention;

[0031] Figure 11 2 is a schematic structural diagram of a vacuum fresh-keeping container in a closed state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0033] See also Figures 1 to 11 As shown, according to an embodiment of the present invention, a vacuum fresh-keeping box is provided, comprising a box body 10, a box cover 20, a button 30, and a sealing member 40. The box body 10 has a receiving chamber A. The box cover 20 is disposed on the box body 10 and seals the receiving chamber A. The box cover 20 is provided with an air extraction port 21, which is in communication with the receiving chamber A. A one-way valve 21a is disposed at the air extraction port 21. The box cover 20 is provided with a mounting groove 22. The button 30 is movably disposed on the box cover 20 and located within the mounting groove 22. A transition chamber B is formed between the button 30 and the inner wall of the mounting groove 22. The button 30 changes the volume of the transition chamber B during movement. The transition chamber B is in communication with the receiving chamber A via the air extraction port 21. The one-way flow direction of the one-way valve 21a is from the receiving chamber A to the transition chamber B. The sealing member 40 is movably installed in the limiting groove 31 of the button 30 . The sealing member 40 can seal the exhaust gap d1 between the button 30 and the side wall of the installation groove 22 . The button 30 drives the sealing member 40 to move during movement.

[0034] When the button 30 moves to reduce the volume of the transition chamber B, the seal 40 opens the exhaust gap d1 between the button 30 and the side wall of the mounting groove 22 to allow external air C to communicate with the transition chamber B.

[0035] When the button 30 moves to expand the volume of the transition chamber B, the seal 40 seals the exhaust gap d1 between the button 30 and the side wall of the installation groove 22 to isolate the external air C from the transition chamber B.

[0036] When the button is pressed, the button moves to reduce the volume of the transition chamber B. Due to the friction between the seal and the side wall of the installation groove, the seal moves upward relative to the button and is blocked by the button's limit groove (see the seal movement direction for details). Figure 2The limiting groove prevents the seal from deflecting too much and not separating from the button. The limiting groove also drags the seal to move with the button, and at this time, the exhaust gap d1 between the button and the side wall of the mounting groove is opened. At the same time, the one-way valve is compressed by atmospheric pressure, so the air in the transition chamber B is squeezed into the external air C due to the downward pressure of the button. Figure 2 Indicated by the arrow curve.

[0037] During the button reset process, the button moves to expand the volume of the transition chamber B. At this time, the seal is offset downward relative to the button due to the friction between the seal and the side wall of the installation groove, and is squeezed into the exhaust gap d1 between the button and the side wall of the installation groove, so that the exhaust gap d1 between the button and the side wall of the installation groove is sealed. When the button is reset, the limit groove will continue to drag the seal to move and seal the exhaust gap d1 at the same time. Since the button starts to move upward from the lowest point, the air pressure value in the space of transition chamber B is lower than the air pressure value in the space of accommodating chamber A, so the one-way valve is lifted up by the pressurized air in accommodating chamber A. At this time, the air in accommodating chamber A is sucked out into transition chamber B due to the reset of the button, as shown in FIG. Figure 3 As shown by the arrow curve in the middle, the button seal achieves one-way air flow through continuous deflection and resetting, similar to the function of a one-way valve. However, the vacuum container of the present invention eliminates the need for a one-way valve, significantly simplifying the components of the air extraction mechanism and reducing the total number of parts in the lid assembly, resulting in a simpler structure. The simple structure of the present invention makes assembly, maintenance, and disassembly more efficient while preventing deformation and resulting failure of the assembly structure. This solves the problem of complex structures in prior vacuum containers and the associated problems.

[0038] Combine Figure 2 and Figure 3 As shown, the limiting groove 31 of the button 30 has a first limiting inner wall 31a and a second limiting inner wall 31b arranged opposite to each other; the spacing direction between the first limiting inner wall 31a and the second limiting inner wall 31b is consistent with the movement direction of the button 30, the first limiting inner wall 31a faces the transition cavity B, and the second limiting inner wall 31b faces the external space; an airflow gap d2 is formed between the sealing member 40 and the button 30 to communicate with the external air C;

[0039] During the movement of the button 30 to reduce the volume of the transition chamber B, the seal 40 abuts against the first limiting inner wall 31a and moves away from the second limiting inner wall 31b, and the airflow gap d2 is connected with the opened exhaust gap d1; that is, when the button is pressed, the seal 40 moves upward relative to the button to open the exhaust gap d1, and at the same time abuts against the first limiting inner wall 31a. During the movement of the button, the first limiting inner wall 31a drags the seal 40 to maintain the relative position.

[0040] As the button 30 moves to expand the volume of the transition chamber B, the seal 40 abuts against and moves away from the second limiting inner wall 31b, simultaneously sealing the exhaust gap d1. That is, when the button is reset, the seal 40 moves downward relative to the button, sealing the exhaust gap d1 while abutting against the second limiting inner wall 31b. During the movement of the button, the second limiting inner wall 31b pulls the seal 40 to maintain its relative position.

[0041] The first limiting inner wall 31a and the second limiting inner wall 31b not only limit the range of movement of the seal 40 to prevent it from separating from the button, but also serve as a driving structure, abutting against the seal 40 and dragging the seal 40 to move synchronously with the button during the corresponding button movement. The limiting groove 31 and the first and second limiting inner walls all have the aforementioned multi-purpose effect.

[0042] Preferably, the button 30 includes a top cover 32 and a support base 33. The top cover 32 is used for operation. The top cover 32 has a first limiting plate 321. The first limiting plate 321 has a first limiting inner wall 31a.

[0043] The support seat 33 is movably disposed in the mounting groove 22 . The support seat 33 has a second limiting plate 331 . The second limiting plate 331 has a second limiting inner wall 31 b .

[0044] The top cover 32 is fixedly connected to the support base 33 , and the limiting groove 31 is formed between the first limiting plate 321 and the second limiting plate 331 .

[0045] See also Figure 1 and Figure 4 The top cover 32 protrudes from the outside to facilitate the user to press. Since the top cover 32 is fixedly connected to the support base 33, the support base will be linked when the top cover is pressed, thereby causing the entire button to move.

[0046] Preferably, the exhaust gap d1 is formed between the outer periphery of the support seat 33 and the side wall of the mounting groove 22. Figure 2 and Figure 3 As shown, the outer diameter of the support seat 33 is smaller than the side wall diameter of the mounting groove 22, so the support seat 33 can slide or move in the mounting groove. At the same time, an exhaust gap for exhaust is formed between the outer periphery of the support seat and the side wall of the mounting groove 22, which makes the structure more compact and does not require a separate exhaust gap d1 to be designed at other positions, thereby simplifying the structure.

[0047] See also Figure 4, a plurality of limiting protrusions 322 are connected to the first limiting plate 321, and the limiting protrusions 322 form the bottom wall of the limiting groove 31; the first limiting plate 321 is provided with an airflow gap at the position of the limiting protrusion 322 (the position of the limiting protrusion 322 in the figure). The seal is a sealing ring structure. The seal is firstly mounted on the support seat 33, and secondly mounted on the limiting protrusion 322. The limiting protrusion 322 forms the bottom wall of the limiting groove 31. There is a distance between the limiting protrusion and the seal 40, and this distance forms an airflow gap d2. After the air entering from the exhaust gap d1 enters the limiting groove 31, it passes through the airflow gap d2 and enters the external air C.

[0048] The limiting protrusion 322 not only limits the seal and secures it for installation, but also cooperates with the seal. Together with the first limiting plate, the limiting protrusion forms the bottom and sidewalls of the limiting groove, simplifying the structure. In this embodiment, the distance between the limiting protrusion and the seal creates an airflow gap d2, facilitating the flow of air between the air and the outside air C.

[0049] It should be noted that an airflow gap d2 is formed between the seal 40 and the button 30, communicating with the outside air C. This gap d2 can be formed by various structures between the seal 40 and the button 30, one of which is described in this embodiment. However, there are many other structural forms for forming the airflow gap d2, and this invention does not impose any specific limitations thereon.

[0050] Considering the reset problem of the button, to maximize the convenience of user operation, see Figure 3 and Figure 4 The vacuum fresh-keeping box further includes an elastic reset member 50 , which is connected between the support seat 33 and the box cover 20 ;

[0051] When the button 30 moves to reduce the volume of the transition chamber B, the elastic return member 50 is compressed; the elastic return member 50 applies an elastic force in the direction of movement of the button 30 to expand the volume of the transition chamber B.

[0052] During the button reset process, the elastic reset member continuously applies an elastic force to reset the button. This also helps create a pressure difference between the transition chamber B and the accommodating chamber A, improving the pumping efficiency. The elastic force of the elastic reset member is adapted to the size of the accommodating chamber.

[0053] In this embodiment, the elastic return member 50 is disposed within the transition chamber B. This elastic return member 50 is a spring. Installing the spring within the transition chamber B effectively utilizes the space within the transition chamber B, maximizing the structural space and resulting in a more compact structure. This also reduces space usage, shrinking the size of the vacuum container and making it more convenient for users.

[0054] The top cover 32 is fixedly connected to the support base 33 by pressure-fusion welding, which simplifies the parts assembly structure and reduces mold costs.

[0055] The box cover can also be produced by pressure-melt welding. The box cover generally includes a box cover upper cover and a box cover base. The box cover upper cover is installed on the box cover base and positioned by three positioning pins. All the structures of the box cover are welded together by pressure-melt welding to achieve the effect of streamlining parts and simplifying molds.

[0056] Of course, in other embodiments not shown, the top cover 32 and the support base 33 are integrally formed, and the top cover 32 and the support base 33 can also be integrally formed using other molding processes. The advantages of integral molding are that the structural strength is improved, the assembly of parts is simplified, and the production efficiency is improved.

[0057] Preferably, the limiting groove 31 is configured to correspond to the structural shape of the mounting groove 22. The limiting groove 31 is an annular groove, and the sealing member 40 is an annular sealing ring. The cooperation between the annular sealing ring and the annular groove provides a more reliable sealing effect, and the overall structure is less prone to deformation, which can meet the high strength requirements of repeated vacuuming operations, ensuring that the vacuum storage container can continue to operate effectively even after long-term use.

[0058] Combine Figure 1 As well as the specific structure of this embodiment, the operating principle of the vacuum fresh-keeping box is specifically introduced:

[0059] External air C is the air in the external space, and its pressure, c, is the same as the atmospheric pressure. Transition chamber B is the variable space, a sealed space where the pressure, b, changes with the upward and downward movement of the button. Sealed chamber A is the internal space, a sealed space where the pressure, a, is the same as the atmospheric pressure when the lid is initially closed. The pressure gradually decreases as the air is exhausted.

[0060] When the button moves upward, the volume of transition chamber B increases. At this time, the air pressure value b decreases as the button moves upward. When the air pressure value b is less than the air pressure value a, the one-way valve is opened and the air in the sealed chamber A enters the transition chamber B. The movement stops when the button reaches the end point and the air pressure value b = a.

[0061] When the button moves downward, the volume of transition chamber B decreases. At this time, the air pressure value b increases with the downward movement of the button. When the air pressure value b exceeds the air pressure value c, the seal opens upward due to the upward pressure and the friction from the side walls of the installation groove. At the same time, the air in transition chamber B enters the external air C until the button moves downward to the bottom. This cycle completes the air extraction action.

[0062] See also Figure 6 and Figure 7 The lid 20 is provided with a balancing valve 60, which is used to connect or isolate the accommodating chamber A from the outside air C. When the vacuum container needs to be opened, the balancing valve is adjusted to the connecting state, allowing the accommodating chamber A to communicate with the outside air C. Once the pressure in the two chambers is equal, the lid can be opened directly. During the vacuuming process, the balancing valve is adjusted to a sealed state to maintain isolation between the accommodating chamber A and the outside air C.

[0063] In this embodiment, Figure 6 The diagram shows the closed state of the balancing valve, in which the balancing valve sealing ring is tightly fitted on the groove of the balancing valve button. Under the elastic force of the balancing valve return spring, the balancing valve button presses the balancing valve sealing ring tightly against the inclined surface of the corresponding hole in the box cover, so that the accommodating chamber A is separated (isolated) from the external air C. Figure 7 The figure shows the connection state of the balancing valve. When the balancing valve button is pressed downward, the sealing ring of the balancing valve is separated from the inclined surface, so that the accommodating chamber A is connected to the external air C, and the air enters the accommodating chamber A through the gap of the valve. Figure 7 As shown by the middle arrow curve, until the internal and external air pressures are balanced.

[0064] Preferably, the outer periphery of the box cover 20 is limitedly connected with a deformable sealing structure 70; when the box cover 20 is placed on the box body 10, the deformable sealing structure 70 is located between the box cover 20 and the box body 10 and deforms to seal the accommodating cavity A.

[0065] Combine Figures 8 to 11 When the lid is assembled onto the box body, the deformable sealing structure 70 is made of a soft silicone material. It deforms under force, forming an arc-shaped structure. When the air inside the box body is extracted, atmospheric pressure exerts pressure on the arc-shaped deformable sealing structure 70, pressing the deformable sealing structure 70 against the inner wall of the box body to achieve a stronger seal. The diameter of the lower cover of the lid is larger than that of the deformable sealing structure 70. Therefore, when the lid is opened, the lower cover can prevent the deformable sealing structure 70 from separating from the lid due to the friction of the inner wall of the box body. This achieves a limited connection of the deformable sealing structure 70 and ensures a stable connection of the entire assembly.

[0066] The present invention provides a reset-type vacuum fresh-keeping box, which repeatedly performs the same action of exhausting gas in the box through the cooperation of a button and a sealing member. Since the volume of the box remains unchanged, the air density in the box decreases as the mass of the gas decreases, and the vacuum degree in the box decreases accordingly. The stability of the vacuum degree in the box is ensured by a one-way valve; the sealing performance is improved by the structural design of the box body sealing ring; the parts assembly structure is simplified by pressure-fusion welding, and the mold cost is reduced.

[0067] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0068] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0069] Of course, the above are preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vacuum fresh-keeping box, characterized in that: include: The box body (10) has a receiving cavity (A); A box cover (20), the box cover (20) is arranged on the box body (10) and seals the accommodating cavity (A); the box cover (20) is provided with an air extraction port (21), the air extraction port (21) is communicated with the accommodating cavity (A), and a one-way valve (21a) is provided at the air extraction port (21); the box cover (20) is provided with a mounting groove (22); A button (30), the button (30) is movably arranged on the box cover (20) and located in the installation groove (22), a transition chamber (B) is formed between the button (30) and the inner wall of the installation groove (22), and the button (30) changes the volume of the transition chamber (B) during movement; the transition chamber (B) is connected to the accommodating chamber (A) through the air extraction port (21), and the one-way flow direction of the one-way valve (21a) is from the accommodating chamber (A) to the transition chamber (B); a sealing member (40), the sealing member (40) being movably mounted in the limiting groove (31) of the button (30), the sealing member (40) being capable of sealing the exhaust gap (d1) between the button (30) and the side wall of the mounting groove (22), and the button (30) driving the sealing member (40) to move during movement; When the button (30) moves to reduce the volume of the transition chamber (B), the sealing member (40) opens the exhaust gap (d1) between the button (30) and the side wall of the mounting groove (22) to allow external air (C) to communicate with the transition chamber (B); When the button (30) moves to expand the volume of the transition chamber (B), the seal (40) seals the exhaust gap (d1) between the button (30) and the side wall of the mounting groove (22) to isolate the external air (C) from the transition chamber (B).

2. The vacuum fresh-keeping container according to claim 1, characterized in that: The limiting groove (31) of the button (30) has a first limiting inner wall (31a) and a second limiting inner wall (31b) that are arranged opposite to each other; the spacing direction between the first limiting inner wall (31a) and the second limiting inner wall (31b) is consistent with the moving direction of the button (30), the first limiting inner wall (31a) faces the transition cavity (B), and the second limiting inner wall (31b) faces the external space; an airflow gap (d2) communicating with the external air (C) is formed between the sealing member (40) and the button (30); When the button (30) moves to reduce the volume of the transition chamber (B), the sealing member (40) abuts against the first limiting inner wall (31a) and moves away from the second limiting inner wall (31b), and the airflow gap (d2) communicates with the opened exhaust gap (d1); When the button (30) moves to expand the volume of the transition chamber (B), the sealing member (40) abuts against the second limiting inner wall (31b) and moves away from the second limiting inner wall (31b), and the sealing member (40) simultaneously seals the exhaust gap (d1).

3. The vacuum fresh-keeping container according to claim 2, characterized in that: The button (30) comprises: A top cover (32), the top cover (32) is used for operation, the top cover (32) has a first limiting plate (321), and the first limiting plate (321) has the first limiting inner wall (31a); A support seat (33), the support seat (33) being movably disposed in the mounting groove (22), the support seat (33) having a second limiting plate (331), and the second limiting plate (331) having a second limiting inner wall (31b); The top cover (32) is fixedly connected to the support seat (33), and the limiting groove (31) is formed between the first limiting plate (321) and the second limiting plate (331).

4. The vacuum fresh-keeping container according to claim 3, characterized in that: The exhaust gap (d1) is formed between the outer periphery of the support seat (33) and the side wall of the installation groove (22).

5. The vacuum fresh-keeping container according to claim 3, characterized in that: A plurality of limiting protrusions (322) are connected to the first limiting plate (321), and the limiting protrusions (322) form the bottom wall of the limiting groove (31); The first limiting plate (321) is provided with an airflow notch at the position of the limiting protrusion (322).

6. The vacuum fresh-keeping container according to claim 3, characterized in that: It also includes an elastic reset member (50), wherein the elastic reset member (50) is connected between the support seat (33) and the box cover (20); When the button (30) moves to reduce the volume of the transition chamber (B), the elastic reset member (50) is compressed; the elastic reset member (50) applies an elastic force in the direction of movement of the button (30) to expand the volume of the transition chamber (B).

7. The vacuum fresh-keeping container according to claim 6, characterized in that: The elastic return member (50) is arranged in the transition cavity (B), and the elastic return member (50) is a spring.

8. The vacuum fresh-keeping container according to claim 3, characterized in that: The top cover (32) and the support seat (33) are fixedly connected by pressure-fusion welding; Alternatively, the top cover (32) and the support seat (33) are an integrally formed structure.

9. The vacuum fresh-keeping container according to claim 2, characterized in that: The limiting groove (31) is arranged to correspond to the structural shape of the installation groove (22), the limiting groove (31) is an annular groove, and the sealing member (40) is an annular sealing ring.

10. The vacuum fresh-keeping container according to claim 1, characterized in that: The box cover (20) is provided with a balancing valve (60), and the balancing valve (60) is used to connect or isolate the accommodating chamber (A) from the external air (C).

11. The vacuum fresh-keeping container according to claim 1, characterized in that: The outer periphery of the box cover (20) is limitedly connected with a deformable sealing structure (70); When the box cover (20) is placed on the box body (10), the deformable sealing structure (70) is located between the box cover (20) and the box body (10) and deforms to seal the accommodating cavity (A).

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