CN117141934A - Vacuum storage box - Google Patents

Abstract

The invention discloses a vacuum fresh-keeping box, which includes: a box body; a box lid; and a button. The button is movably arranged on the box lid and located in an installation groove. A transition cavity is formed between the button and the inner wall of the installation groove, and the button moves The volume of the transition chamber is changed during the process; the transition chamber and the accommodation chamber are connected through the air extraction port, and the one-way flow direction of the one-way valve is from the accommodation chamber to the transition chamber; the seal can seal between the button and the side wall of the installation groove The exhaust gap, the button drives the seal to move during the movement; when the button moves to reduce the volume of the transition chamber, the seal opens the exhaust gap between the button and the side wall of the installation groove to allow external air to communicate with the transition chamber; When the button moves to expand the volume of the transition chamber, the seal seals the exhaust gap between the button and the side wall of the mounting groove to isolate outside air from the transition chamber. The vacuum fresh-keeping box of the present invention effectively solves the problem of complex structure of the vacuum fresh-keeping box in the prior art.

Description

Vacuum storage box

Technical field

The present invention relates to the technical field of vacuum preservation boxes, and specifically to a vacuum preservation box.

Background technique

With the continuous progress of society and the continuous improvement of people's living standards, vacuum crispers, as a new and convenient fresh-keeping appliance, are increasingly used by people and have entered into the daily lives of more and more people. .

Vacuum preservation boxes can effectively extend the shelf life of food and prevent food from oxidation, mildew, insects, rot, moisture, etc. At the same time, it can also keep the original taste and nutritional value of food. In addition, the material of the vacuum crisper box is healthy and harmless, and the transparency is also very good. You can clearly see the food in the box, making it easy to check the freshness of the food.

Existing vacuum crisper boxes generally use a vacuum pump to extract the air in the box to reduce the vacuum degree of the crisper box, thereby achieving the purpose of preservation. However, in order to use the vacuum crisper, you need to carry an electric or manual vacuum pump so that it can be used at any time.

At present, the vacuuming method of some existing vacuum crisper boxes is to evacuate successively by alternately opening and closing multiple one-way valves. However, this type of structure has many parts and one-way valves are often used, so that The parts assembly structure is complex, and the assembly structure is deformed and prone to failure.

In summary, the structure of the vacuum crisper box in the prior art is complicated.

Contents of the invention

An embodiment of the present invention provides a vacuum crisper box to solve the problem of the complicated structure of the vacuum crisper box in the prior art.

In order to achieve the above object, the present invention provides a vacuum fresh-keeping box, which includes: a box body with an accommodation cavity; a box lid, which is disposed on the box body and seals the accommodation cavity; An air extraction port is provided, the air extraction port is connected with the accommodation cavity, and a one-way valve is provided at the air extraction port; the box cover is provided with an installation groove; and a button is movably provided on the box cover. and located in the installation slot, a transition cavity is formed between the button and the inner wall of the installation slot, and the button changes the volume of the transition cavity during movement; the transition cavity and the accommodation cavity pass through The air extraction port is connected, and the one-way flow direction of the one-way valve is from the accommodation chamber to the transition chamber; a seal is movably installed in the limit groove of the button, so The sealing member can seal the exhaust gap between the button and the side wall of the installation groove. The button drives the sealing member to move during movement; when the button moves to reduce the volume of the transition cavity, , the seal opens the exhaust gap between the button and the side wall of the installation groove to allow external air to communicate with the transition chamber; during the movement of the button to expand the volume of the transition chamber, the 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 chamber.

Further, the limiting groove of the button has a first limiting inner wall and a second limiting inner wall arranged oppositely; the spacing direction of the first limiting inner wall and the second limiting inner wall is consistent with the movement of the button. The directions are consistent, 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 outside air is formed between the seal and the button; in the When the button is moving to reduce the volume of the transition chamber, the sealing member abuts the first limiting inner wall and moves away from the second limiting inner wall, and the air flow gap is connected to the open exhaust gap; when the During the movement of the button to expand the volume of the transition cavity, the sealing member abuts against the second limiting inner wall and moves away from the second limiting inner wall, and the sealing member seals the exhaust gap at the same time.

Further, the button includes: a top cover, the top cover is used for operation, the top cover has a first limiting plate, the first limiting plate has the first limiting inner wall; a support base, The support base is movably arranged in the installation groove, the support base has a second limiting plate, and the second limiting plate has the second limiting inner wall; the top cover and the support base Fixed connection, the limiting groove is formed between the first limiting plate and the second limiting plate.

Further, the exhaust gap is formed between the outer periphery of the support seat and the side wall of the installation groove.

Further, a plurality of limiting protrusions are connected to the first limiting plate, and the limiting protrusions form the bottom wall of the limiting groove; the first limiting plate is connected to the limiting protrusions. An airflow gap is provided at the starting position.

Further, it also includes an elastic return member connected between the support base and the box cover; when the button moves to reduce the volume of the transition chamber, the elastic return member is compressed; The elastic return member exerts an elastic force toward the moving direction of the button to expand the volume of the transition cavity.

Further, the elastic return member is disposed in the transition cavity, and the elastic return member is a spring.

Further, the top cover and the support seat are fixedly connected through pressure welding; or, the top cover and the support seat are an integrally formed structure.

Further, the limiting groove is arranged corresponding to the structural shape of the installation groove, the limiting groove is an annular groove, and the sealing member is an annular sealing ring.

Furthermore, a balance valve is provided on the box cover, and the balance valve is used to communicate or isolate the accommodation cavity from external air.

Furthermore, a deformable sealing structure is connected to the outer circumference of the box lid; when the box lid is placed on the box body, the deformable sealing structure is located between the box lid and the box body. and deform to seal the accommodation cavity.

When the button is pressed, the button moves to reduce the volume of the transition cavity. Due to the friction between the seal and the side wall of the installation groove, the seal is deflected upward relative to the button and is blocked by the limit groove of the button. The limit groove prevents the seal from deflecting too much and not breaking away from the button. The limit groove also drags the seal to move with the button. At this time, the exhaust gap between the button and the side wall of the installation groove is blocked. Step aside. At the same time, the one-way valve is compressed by the atmospheric pressure, so the air in the transition chamber space is squeezed out into the outside air due to the downward pressure of the button.

During the reset process of the button, the button moves to expand the volume of the transition cavity. At this time, due to the friction between the seal and the side wall of the installation groove, the seal is deflected downward relative to the button and is squeezed in the The exhaust gap between the button and the side wall of the installation groove is sealed, so that the exhaust gap between the button and the side wall of the installation groove is sealed. When the button is reset, the limit groove will keep dragging the seal to move and seal the exhaust gap at the same time. Since the button starts to move upward from the lowest point, the air pressure value in the transition chamber space is less than the air pressure value in the accommodation chamber space, so the one-way valve is pushed up by the pressure air in the accommodation chamber. At this time, the air in the accommodation chamber is sucked out due to the reset of the button. to the transition cavity. In this way, the button sealing ring achieves the function of one-way gas circulation through continuous deflection and reset, which has the same function as the one-way valve. However, the vacuum crisper of the present invention structurally reduces the use of one one-way valve, which greatly reduces the need for one-way valve. The use of parts of the air extraction structure is simplified, and the total number of parts of the box cover assembly is reduced, so the structure is simpler. The simple structure of the present invention can make assembly, maintenance and disassembly more efficient, and at the same time avoid the assembly structure from being easily deformed and causing failure, and solves the problem of the complicated structure of the vacuum crisper box in the prior art and the problems caused by the complicated structure.

Description of the drawings

Figure 1 is a schematic diagram of the internal structure of a vacuum crisper according to an embodiment of the present invention;

Figure 2 is a schematic structural diagram of the vacuum crisper box according to the embodiment of the present invention when the button is pressed;

Figure 3 is a schematic diagram of the structure of the vacuum crisper box when the button is reset according to the embodiment of the present invention;

Figure 4 is an exploded schematic structural view of the button, seal and elastic return member of the vacuum crisper box according to the embodiment of the present invention;

Figure 5 is a structural exploded schematic diagram of the lid of the vacuum crisper box according to the embodiment of the present invention;

Figure 6 is a schematic diagram of the structure of the balance valve of the vacuum crisper box in a blocked state according to the embodiment of the present invention;

Figure 7 is a schematic structural diagram of the balance valve of the vacuum crisper box in a connected state according to the embodiment of the present invention;

Figure 8 is a schematic diagram of the structural coordination of the deformable sealing structure of the vacuum crisper box according to the embodiment of the present invention when it is not deformed;

Figure 9 is a schematic diagram of the structural fit of the deformable sealing structure of the vacuum crisper box after deformation according to the embodiment of the present invention;

Figure 10 is a schematic structural diagram of the open state of the vacuum crisper box according to the embodiment of the present invention;

Figure 11 is a schematic structural diagram of the closed state of the vacuum crisper box according to the embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

Referring to FIGS. 1 to 11 , according to an embodiment of the present invention, a vacuum crisper box is provided. The vacuum crisper box includes a box body 10 , a lid 20 , a button 30 and a seal 40 . The box body 10 has a receiving cavity A. ; The box cover 20 is installed on the box body 10 and seals the accommodation cavity A; the box cover 20 is provided with an air extraction port 21, and the air extraction port 21 is connected with the accommodation cavity A. The air extraction port 21 is provided with a one-way valve 21a; the box cover 20 is provided with an installation slot 22. The button 30 is movably disposed on the box cover 20 and is located in the installation groove 22. A transition cavity B is formed between the button 30 and the inner wall of the installation groove 22. During the movement of the button 30 The volume of the transition chamber B is changed; the transition chamber B and the accommodation chamber A are connected through the air extraction port 21, and the one-way flow direction of the one-way valve 21a is from the accommodation chamber A to the transition Chamber B is in circulation. The seal 40 is movably installed in the limiting groove 31 of the button 30, and the seal 40 can seal the exhaust gap d1 between the button 30 and the side wall of the installation groove 22, so The button 30 drives the seal 40 to move during its movement.

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 installation groove 22 to allow the external air C to communicate with the Transition cavity B is connected;

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 allow the external air C to communicate with the Transition cavity B partition.

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 is deflected upward relative to the button and is blocked by the limit groove of the button. (See the arrow in Figure 2 for the direction of movement of the seal). The limit groove prevents the seal from deflecting too much and not leaving the button. The limit groove also drags the seal to move with the button, and at this time the button is in contact with the button. The exhaust gap d1 between the side walls of the installation groove is cleared. At the same time, the one-way valve is compressed by the atmospheric pressure, so the air in the transition chamber B is squeezed out into the outside air C due to the downward pressure of the button, as shown by the arrow curve in Figure 2.

During the reset process of the button, the button moves to expand the volume of the transition chamber B. At this time, due to the friction between the seal and the side wall of the installation groove, the seal is deflected downward relative to the button and is squeezed in In the exhaust gap d1 between the button and the side wall of the installation groove, 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 keep dragging 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 transition chamber B space is less than the air pressure value in the accommodation chamber A space, so the one-way valve is pushed up by the pressure air of the accommodation chamber A. At this time, the air in the accommodation chamber A is due to the button The reset is sucked out into the transition chamber B, as shown by the arrow curve in Figure 3. In this way, the button sealing ring achieves the function of one-way gas circulation through continuous deflection and reset, which has the same function as the one-way valve. However, the vacuum crisper of the present invention structurally reduces the use of one one-way valve, which greatly reduces the need for one-way valve. The use of parts of the air extraction structure is simplified, and the total number of parts of the box cover assembly is reduced, so the structure is simpler. The simple structure of the present invention can make assembly, maintenance and disassembly more efficient, and at the same time avoid the assembly structure from being easily deformed and causing failure, and solves the problem of the complicated structure of the vacuum crisper box in the prior art and the problems caused by the complicated structure.

As shown in FIGS. 2 and 3 , the limiting groove 31 of the button 30 has a first limiting inner wall 31 a and a second limiting inner wall 31 b arranged oppositely; the first limiting inner wall 31 a and the second limiting inner wall 31 b The spacing direction of the inner limiting wall 31b is consistent with the moving direction of the button 30, the first limiting inner wall 31a faces the transition chamber B, and the second limiting inner wall 31b faces the external space; the seal 40 and the An airflow gap d2 connected to the outside air C is formed between the buttons 30;

When the button 30 moves to reduce the volume of the transition chamber B, the seal 40 contacts the first limiting inner wall 31a and moves away from the second limiting inner wall 31b, and the airflow gap d2 is opened. The exhaust gap d1 is connected; 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 contacts the first limiting inner wall 31a. During the button movement, the first limiting inner wall 31a drags the seal 40 to maintain relative position.

When the button 30 moves to expand the volume of the transition chamber B, the sealing member 40 abuts the second limiting inner wall 31b and moves away from the second limiting inner wall 31b, and the sealing member 40 seals at the same time. The exhaust gap d1. That is, when the button is reset, the sealing member 40 moves downward relative to the button to seal the exhaust gap d1, and at the same time abuts the second limiting inner wall 31b. During the movement of the button, the second limiting inner wall 31b drags the sealing member 40 to maintain relative position. Location.

The first limiting inner wall 31a and the second limiting inner wall 31b not only limit the movement range of the seal 40 and prevent it from leaving the button, but also serve as a driving structure to contact the seal 40 and drag the seal during the corresponding button movement. The piece 40 moves synchronously with the button. The limiting groove 31 and the first and second limiting inner walls all have the above-mentioned multi-purpose effect.

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 the third limiting plate. a limiting inner wall 31a;

The support base 33 is movably disposed in the installation groove 22, the support base 33 has a second limiting plate 331, and the second limiting plate 331 has the second limiting inner wall 31b;

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 .

Referring to Figures 1 and 4, the top cover 32 protrudes outside to facilitate the user to press it. Since the top cover 32 is fixedly connected to the support base 33, when the top cover is pressed, the support base will be linked, thereby causing the entire button to move.

Preferably, the exhaust gap d1 is formed between the outer periphery of the support seat 33 and the side wall of the installation groove 22 . As shown in FIGS. 2 and 3 , the outer diameter of the support seat 33 is smaller than the diameter of the side wall of the installation groove 22 , so the support seat 33 can slide or move in the installation groove. At the same time, the outer periphery of the support seat is in contact with the side wall of the installation groove 22 . An exhaust gap for exhaust is also formed between the walls, which makes the structure more compact, and there is no need to separately design the exhaust gap d1 at other locations, simplifying the structure.

Referring to Figure 4, the first limiting plate 321 is connected with a plurality of limiting protrusions 322, and the limiting protrusions 322 form the bottom wall of the limiting groove 31; the first limiting plate 321 An airflow gap is provided 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 first set on the support seat 33, and secondly, it is set on the limit protrusion 322. The limit protrusion 322 forms the bottom wall of the limit groove 31. There is a distance between the limiting protrusion and the seal 40. This distance forms the airflow gap d2. After the air entering from the exhaust gap d1 enters the limiting groove 31, it passes through the airflow gap from the airflow gap d2 and enters the airflow gap d2. Outside air C.

The limiting protrusion 322 not only plays a role in limiting the position of the sealing member, but also plays a role in installation and blocking, and also cooperates with the sealing member. The limiting protrusion and the first limiting plate together form the bottom wall and side wall structure of the limiting groove, which simplifies the structure. In this embodiment, the airflow gap d2 is formed by the distance between the limiting protrusion and the sealing member to facilitate the circulation of air and external air C.

It should be noted that an airflow gap d2 connected to the outside air C is formed between the seal 40 and the button 30 , which can be formed by multiple structures between the seal 40 and the button 30 . In this embodiment, Out of one of the ways. However, the structural form for forming the airflow gap d2 can be implemented in many other ways, and the present invention does not impose any specific limitations.

Considering the reset problem of the button, and to maximize the convenience of user operation, see Figure 3 and Figure 4, the vacuum crisper box also includes an elastic return member 50, the elastic return member 50 is connected between the support base 33 and the box lid 20 between;

When the button 30 moves to reduce the volume of the transition cavity B, the elastic return member 50 is compressed; the elastic return member 50 exerts an elastic force toward the movement direction of the button 30 to expand the volume of the transition cavity B.

During the button reset process, the elastic reset member always exerts elastic force to reset the button, and can assist in creating a pressure difference between the transition chamber B and the accommodation chamber A, thereby improving the air pumping efficiency. The elastic force of the elastic restoring member is adapted according to the size of the accommodation cavity.

In this embodiment, the elastic return member 50 is disposed in the transition cavity B, and the elastic return member 50 is a spring. The spring is installed in the transition cavity B, which effectively utilizes the space of the transition cavity B, fully utilizes the structural space, and makes the structure more compact. It also reduces space occupation, reduces the size of the vacuum crisper box, and is more convenient for users to use.

The top cover 32 and the support base 33 are fixedly connected through pressure welding. Simplify the assembly structure of parts and reduce mold costs through pressure fusion welding.

The lid can also be produced using pressure fusion welding. The lid generally includes a lid upper cover and a lid base. The lid upper cover is installed on the lid base and positioned through three positioning pins. It is pressure fusion welded. All the structures of the box cover are welded together to achieve the effect of streamlining parts and simplifying the mold.

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

Preferably, the limiting groove 31 is provided corresponding 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 of the annular sealing ring and the annular groove makes the sealing effect more reliable, and the overall structure is not prone to deformation, which can meet the high-intensity needs of repeated air pumping actions and ensure that the vacuum crisper box can operate effectively after long-term use.

Combined with Figure 1 and the specific structure of this embodiment, the operating principle of the vacuum crisper box is introduced in detail:

The external air C is the air in the external space, and the air pressure value c is the same as the atmospheric pressure of the external air. The transition chamber B is a changing space, where the space is sealed, and the air pressure value b changes with the up and down movement of the button. Sealed cavity A is the internal space, where the space is sealed. The air pressure value a is the same as the atmospheric pressure of the outside air when the box lid is initially closed. As the air is exhausted, the air pressure value will gradually decrease.

When the button moves upward, the volume (volume) of the transition chamber B becomes larger. At this time, the air pressure value b becomes smaller 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 chamber is sealed. The air in A enters the transition chamber B and stops when the button moves upward to the end point and the air pressure value b=a.

When the button moves downward, the volume of the transition chamber B becomes smaller. At this time, the air pressure value b becomes larger as the button moves downward. When the air pressure value b is greater than the air pressure value c, the seal is subject to upward pressure and comes from the installation. The friction force of the groove side wall opens upward, and at the same time, the air in the transition chamber B enters the external air C until the button moves downward to the end. By repeating this cycle, the air pumping action can be completed.

Referring to FIGS. 6 and 7 , a balance valve 60 is provided on the box cover 20 , and the balance valve 60 is used to connect or isolate the accommodation chamber A and the external air C. When it is necessary to open the vacuum crisper box, adjust the balance valve to the connected state so that the accommodation chamber A is connected to the external air C. After the pressures in the two parts are equal, the lid can be opened directly. During the vacuuming process, the balance valve is adjusted to a closed state to maintain isolation between the accommodation chamber A and the external air C.

In this embodiment, Figure 6 shows the closed state of the balance valve, in which the balance valve sealing ring is tightly sleeved on the groove of the balance valve button, and is affected by the elastic force of the balance valve return spring. The balance valve button moves the balance valve The sealing ring is pressed tightly against the inclined surface of the corresponding hole in the box cover, so that the accommodation chamber A is isolated from the outside air C. Figure 7 shows the connection state of the balance valve. When the balance valve button is pressed downward, the balance valve sealing ring breaks away from the slope, allowing the accommodation chamber A to communicate with the external air C. The air enters the accommodation chamber A from the gap of the valve. , as shown by the arrow curve in Figure 7, until the internal and external air pressures are balanced.

Preferably, a deformable sealing structure 70 is connected to the outer circumference of the box cover 20; 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. The boxes 10 are deformed to seal the accommodating cavity A.

With reference to Figures 8 to 11, when the box lid is assembled to the box body, since the deformable sealing structure 70 is made of silicone and is a soft material, the deformable sealing structure 70 deforms under force and forms an arc-shaped structure. When the box When the air inside the box is extracted and the atmospheric pressure exerts pressure on the arc-shaped deformable sealing structure 70, the deformable sealing structure 70 is pressed against the inner wall of the box to achieve a reinforced sealing effect. The diameter of the lower cover of the box cover is larger than the diameter of the deformable sealing structure 70, so when the cover is opened, the lower cover of the box cover can prevent the deformable sealing structure 70 from detaching from the box cover under the action of the friction force of the inner wall of the box body, that is, achieving The limited connection of the deformable sealing structure 70 is provided to ensure a stable connection relationship of the entire component.

The invention provides a reset-type vacuum preservation box, which repeatedly completes the same action of removing gas in the box through the cooperation of buttons and seals. Since the volume of the box remains unchanged, the air density in the box is reduced. As the gas mass decreases, the vacuum degree in the box decreases, and the one-way valve is used to ensure the stability of the vacuum degree in the box; the sealing performance is improved through the structural design of the box sealing ring; through the pressure Fusion welding simplifies the assembly structure of parts and reduces mold costs.

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, the singular forms are also intended to include the plural forms unless the context clearly indicates otherwise. Furthermore, it will be understood that when the terms "comprises" and/or "includes" are used in this specification, they indicate There are features, steps, work, means, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein.

Of course, the above are preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the basic principles of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims (11)

1. A vacuum fresh-keeping box, characterized by comprising:

a case (10) having a housing chamber (A);

the box cover (20) is arranged on the box body (10) in a covering manner and seals the accommodating cavity (A); an extraction opening (21) is formed in the box cover (20), the extraction opening (21) is communicated with the accommodating cavity (A), and a one-way valve (21 a) is arranged at the extraction opening (21); the box cover (20) is provided with a mounting groove (22);

a button (30), wherein the button (30) is movably arranged on the box cover (20) and positioned in the mounting groove (22), a transition cavity (B) is formed between the button (30) and the inner wall of the mounting groove (22), and the volume of the transition cavity (B) is changed during the movement of the button (30); the transition cavity (B) is communicated with the accommodating cavity (A) through the air extraction opening (21), and the unidirectional circulation direction of the one-way valve (21 a) is that the accommodating cavity (A) circulates to the transition cavity (B);

a seal member (40), wherein the seal member (40) is movably arranged in a limit groove (31) of the button (30), the seal member (40) can seal an exhaust gap (d 1) between the button (30) and the side wall of the mounting groove (22), and the button (30) drives the seal member (40) to move in the moving process;

in the movement of the button (30) to reduce the volume of the transition chamber (B), the seal (40) opens a vent gap (d 1) between the button (30) and a side wall of the mounting groove (22) to communicate external air (C) with the transition chamber (B);

during movement of the button (30) to expand the volume of the transition chamber (B), the seal (40) seals an exhaust gap (d 1) between the button (30) and a side wall of the mounting groove (22) to block outside air (C) from the transition chamber (B).

2. The vacuum fresh-keeping box according to claim 1, wherein,

the limiting groove (31) of the button (30) is provided with a first limiting inner wall (31 a) and a second limiting inner wall (31 b) which are oppositely arranged; the spacing direction of the first limiting inner wall (31 a) and the second limiting inner wall (31B) is consistent with the moving direction of the button (30), the first limiting inner wall (31 a) faces the transition cavity (B), and the second limiting inner wall (31B) faces the external space; an air flow gap (d 2) communicated with the outside air (C) is formed between the sealing member (40) and the button (30);

in the movement of the button (30) to reduce the volume of the transition chamber (B), the seal (40) abuts against the first limit inner wall (31 a) and is distanced from the second limit inner wall (31B), the air flow gap (d 2) being in communication with the open exhaust gap (d 1);

during the movement of the button (30) to enlarge the volume of the transition chamber (B), the sealing element (40) abuts against the second limiting inner wall (31B) and is distant from the second limiting inner wall (31B), the sealing element (40) simultaneously sealing the exhaust gap (d 1).

3. Vacuum fresh box according to claim 2, characterized in that the push button (30) comprises:

a top cover (32), the top cover (32) being used for operation, the top cover (32) having a first limiting plate (321), the first limiting plate (321) having the first limiting inner wall (31 a);

a support seat (33), wherein the support seat (33) is movably arranged in the mounting groove (22), the support seat (33) is provided with a second limiting plate (331), and the second limiting plate (331) is provided with the second limiting inner wall (31 b);

the top cover (32) is fixedly connected with the supporting 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 box according to claim 3, wherein,

the exhaust gap (d 1) is formed between the outer periphery of the support seat (33) and the side wall of the mounting groove (22).

5. The vacuum fresh-keeping box according to claim 3, wherein,

a plurality of limit protrusions (322) are connected to the first limit plate (321), and the limit protrusions (322) form the bottom wall of the limit 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 box according to claim 3, wherein,

the box further comprises an elastic reset piece (50), wherein the elastic reset piece (50) is connected between the supporting seat (33) and the box cover (20);

-said elastic return element (50) is compressed during the movement of said push-button (30) to reduce the volume of said transition chamber (B); the elastic return element (50) exerts an elastic force in the direction of movement of the push button (30) to expand the volume of the transition chamber (B).

7. The vacuum fresh-keeping box according to claim 6, wherein,

the elastic reset piece (50) is arranged in the transition cavity (B), and the elastic reset piece (50) is a spring.

8. A vacuum fresh-keeping box according to claim 3, wherein the top cover (32) and the support (33) are fixedly connected by means of compression welding;

or, the top cover (32) and the supporting seat (33) are of an integrated structure.

9. The vacuum fresh-keeping box according to claim 2, wherein,

the limiting groove (31) is arranged corresponding to the structure of the mounting groove (22), the limiting groove (31) is an annular groove, and the sealing piece (40) is an annular sealing ring.

10. Vacuum fresh box according to claim 1, characterized in that the box cover (20) is provided with a balancing valve (60), the balancing valve (60) being used for communicating or blocking the containing cavity (a) with the outside air (C).

11. Vacuum fresh box according to claim 1, characterized in that the outer Zhou Xianwei of the box cover (20) is connected with a deformable sealing structure (70);

when the box cover (20) is arranged on the box body (10), the deformable sealing structure (70) is positioned between the box cover (20) and the box body (10) and deforms so as to seal the accommodating cavity (A).