Fresh-keeping box and its lid assembly

Abstract

The present invention discloses a fresh-keeping box and its lid assembly, the lid assembly includes: an elastic sealing pad, a knob and a limiter, the elastic sealing pad covers the opening of the box body, the elastic sealing pad is provided with a column, the guiding direction of the guide part on the column intersects with the central axis of the column, the two ends of the guide part respectively form a starting position and an end position, and the end position is closer to the elastic sealing pad relative to the starting position; a rotation hole is provided on one side of the knob, and the inner wall of the rotation hole is provided with a sliding part; the limiter includes a connected abutment part and a support seat, the abutment part abuts with the elastic sealing pad so that there is a gap between the elastic sealing pad and the support seat, the knob abuts on the support seat, the column passes through the support seat and is inserted into the rotation hole, the sliding part cooperates with the guide part, and the sliding part can slide back and forth between the starting position and the end position. In this way, during the adjustment process, the user only needs to change the volume of the fresh-keeping box by simply turning the knob, thereby changing the vacuum degree in the box.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping containers, in particular to a fresh-keeping box and a box cover assembly thereof. Background Art

[0002] With the development of society and the advancement of technology, people have higher requirements for food preservation. Fresh-keeping boxes are one of the most commonly used food preservation tools, which can keep food fresh in a short time.

[0003] At present, common fresh-keeping boxes generally have an air extraction hole on the lid. A separate air extraction pump is used to suck out some of the air inside the box at the air extraction hole to increase the vacuum level inside the box and achieve a better preservation effect. However, this type of fresh-keeping box is inconvenient to carry, and there is a problem that the air extraction pump is easy to lose and cannot be used. In response to this, new fresh-keeping boxes have gradually appeared on the market. They mainly reduce the pressure inside the box by changing the internal volume to increase the vacuum level and achieve a food preservation effect. Although the new fresh-keeping box does not require a vacuum pump, which solves the problem of inconvenience in carrying, due to its relatively complex structure, it requires the user to use both hands when operating it, which is inconvenient to operate. Summary of the Invention

[0004] Based on this, it is necessary to provide a fresh-keeping box and a lid assembly thereof to address the above problems. The lid assembly can change the vacuum degree in the fresh-keeping box and is more convenient to operate.

[0005] 4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut. The through-hole comprises a screw bolt, and the nut is engaged with the bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut.

[0006] In the above-mentioned box cover assembly, when the elastic sealing pad covers the opening of the box body, the elastic sealing pad can form a closed cavity in the box body for storing food that needs to be kept fresh. Since the column is arranged on the side of the elastic sealing pad facing away from the box body, the volume of the cavity in the box body can be changed by pulling the column up and down, thereby changing the vacuum degree in the box body. Specifically, since the limiter is located between the elastic sealing member and the knob, the knob abuts on the support seat, and a rotation hole is opened on the side of the knob facing the elastic sealing pad, the inner wall of the rotation hole is provided with a sliding portion, and the column is provided with a guide portion, the guiding direction of the guide portion intersects with the central axis of the column. When the column passes through the support seat and is inserted into the rotation hole, the guide portion can be guided by the sliding portion. At the same time, since the abutting portion abuts against the elastic sealing pad, there is a gap between the elastic sealing pad and the support seat. Therefore, the sliding portion can be made to slide back and forth between the starting position and the ending position by rotating the knob, thereby enabling the column to move up and down to change the vacuum degree in the box body. Furthermore, because the end position of the guide portion is closer to the elastic sealing gasket than the starting position, when the knob is turned to slide the sliding portion from the starting position to the end position, the column can pull the elastic sealing gasket upward, thereby increasing the volume of the cavity between the box body and the elastic sealing gasket, thereby improving the vacuum level within the cavity; when the knob is turned to slide the sliding portion from the end position to the starting position, the column will move downward to reset the elastic sealing gasket. It can be seen that the above-mentioned box lid assembly can effectively change the vacuum level within the fresh-keeping box, thereby preserving the freshness of food. At the same time, during the adjustment process, the user can change the vacuum level of the fresh-keeping box by simply turning the knob.

[0007] The technical solution is further described below:

[0008] In one embodiment, the box cover assembly further includes an elastic member, which is sleeved outside the column and abuts between the elastic sealing pad and the support seat, and the elastic member is used to apply an elastic force to the elastic sealing pad in a direction opposite to the support seat.

[0009] In one embodiment, the abutment portion is an annular structure, and the elastic sealing gasket is provided with a circle of flange on the side facing the limit member, and the flange is pressed against the inner wall of the opening of the box body by the abutment portion. The column is located in the abutment portion of the annular structure, and there is a distance between the column and the abutment portion.

[0010] In one embodiment, the guide portion is an oblique guide groove, the two ends of the oblique guide groove are respectively a starting position and an end position, and the sliding portion is a slider, which is slidably disposed in the oblique guide groove.

[0011] In one embodiment, an introduction groove is provided on the outer wall of the column, and one end of the introduction groove passes through an end of the column facing away from the elastic sealing pad, and the other end of the introduction groove is connected to the oblique guide groove.

[0012] In one embodiment, the guiding direction of the guide groove is parallel to the central axis of the column, and the guide groove is connected to the terminal position of the oblique guide groove.

[0013] In one embodiment, a positioning bayonet is further provided on the outer wall of the column, the positioning bayonet is located at the end position and is connected to the inclined guide groove, and the opening of the positioning bayonet faces the elastic sealing pad.

[0014] In one embodiment, a limiting portion is further provided on the outer wall of the column, and the limiting portion extends along the axial direction of the column. A through hole is provided on the support seat, and the column is rotatably connected to the knob through the through hole. A matching portion is provided on the inner wall of the through hole, and the matching portion is guided and matched with the limiting portion, and the column can drive the limiting portion to move on the matching portion along the axial direction of the column.

[0015] In one embodiment, the box cover assembly further includes an upper cover, which is arranged on a side of the support base facing away from the elastic sealing gasket, and the upper cover is provided with a through hole, and the knob is passed through the through hole.

[0016] The present application also provides a fresh-keeping box, comprising: a box body and the box cover assembly as described above, wherein a cavity is formed in the box body, an opening communicating with the cavity is opened on the box wall of the box body, and the elastic sealing gasket seals and covers the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0019] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0020] Figure 1This is a structural diagram of a fresh-keeping box in one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the box cover assembly;

[0022] Figure 3 for Figure 1 Cross-sectional view along line AA;

[0023] Figure 4 for Figure 1 The exploded schematic diagram of the structure of the fresh-keeping box shown;

[0024] Figure 5 for Figure 4 Schematic diagram of the structure of the elastic sealing gasket;

[0025] Figure 6 for Figure 5 A magnified schematic diagram of the structure at the middle circle B;

[0026] Figure 7 for Figure 4 Schematic diagram of the structure of the middle limiter.

[0027] The components in the figure are marked as follows:

[0028] 10. Fresh-keeping box; 110. Lid assembly; 111. Elastic sealing gasket; 1111. Flanged edge; 112. Knob; 113. Limiting member; 1131. Abutting portion; 1132. Support seat; 11321. Through hole; 11322. Fitting portion; 114. Post; 1141. Guide portion; 11411. Starting position; 11412. Ending position; 1142. Introducing slot; 1143. Positioning bayonet; 1144. Limiting portion; 115. Elastic member; 116. Upper cover; 1161. Perforation; 117. Handle; 118. Buckle; 1191. First assembly positioning mark; 1192. Second assembly positioning mark; 120. Box body; 121. Opening. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] See also Figures 1 to 4One embodiment of the present application provides a box cover assembly 110, comprising: an elastic sealing pad 111, a knob 112 and a limiter 113. The elastic sealing pad 111 is used to cover the opening 121 of the box body 120, and a column 114 is provided on the side of the elastic sealing pad 111 facing away from the opening 121. A guide portion 1141 is provided on the column 114, and the guiding direction of the guide portion 1141 intersects with the central axis of the column 114. The two ends of the guide portion 1141 in the guiding direction are respectively a starting position 11411 and an end position 11412, and the end position 11412 is closer to the elastic sealing pad 111 than the starting position 11411. A rotation hole (not shown in the figure) is provided on the side of the knob 112 facing the elastic sealing pad 111. A sliding portion (not shown in the figure) is provided on the inner wall of the rotation hole. The limiter 113 is located between the elastic sealing member and the knob 112. The stopper 113 includes a connected abutment portion 1131 and a support seat 1132. The abutment portion 1131 abuts the elastic sealing gasket 111, creating a gap between the elastic sealing gasket 111 and the support seat 1132. The knob 112 abuts the support seat 1132. The column 114 passes through the support seat 1132 and is inserted into the rotation hole. The sliding portion is guided by the guide portion 1141 and can slide back and forth between a starting position 11411 and an end position 11412.

[0031] In the aforementioned box lid assembly 110, when the elastic sealing gasket 111 covers the opening 121 of the box body 120, the elastic sealing gasket 111 forms a closed cavity within the box body 120 for storing food that needs to be kept fresh. Because the pillars 114 are located on the side of the elastic sealing gasket 111 facing away from the box body 120, the volume of the cavity within the box body 120 can be changed by pulling the pillars 114 up and down, thereby changing the vacuum level within the box body 120. Specifically, since the limit member 113 is located between the elastic seal and the knob 112, the knob 112 abuts against the support seat 1132, and a rotating hole is opened on one side of the knob 112, and a sliding portion is provided on the inner wall of the rotating hole. A guide portion 1141 is provided on the column 114, and the guiding direction of the guide portion 1141 intersects with the central axis of the column 114. When the column 114 passes through the support seat 1132 and is inserted into the rotating hole, the guide portion 1141 can cooperate with the sliding portion guide. At the same time, since the abutting portion 1131 abuts against the elastic sealing pad 111, there is a gap between the elastic sealing pad 111 and the support seat 1132. Therefore, the sliding portion can be made to slide back and forth between the starting position 11411 and the ending position 11412 by rotating the knob 112, so that the column 114 can move up and down to change the vacuum degree in the box body 120. In addition, since the end position 11412 of the guide portion 1141 is closer to the elastic sealing gasket 111 than the starting position 11411, when the knob 112 is turned to slide the sliding portion from the starting position 11411 to the end position 11412, the column 114 can pull the elastic sealing gasket 111 upward, thereby increasing the volume of the cavity between the box body 120 and the elastic sealing gasket 111, thereby improving the vacuum degree in the cavity; when the knob 112 is turned to slide the sliding portion from the end position 11412 to the starting position 11411, the column 114 will move downward to reset the elastic sealing gasket 111. It can be seen that the use of the above-mentioned box cover assembly 110 can effectively change the vacuum degree in the fresh-keeping box 10 to achieve the preservation of food. At the same time, during the adjustment process, the user can change the vacuum degree of the fresh-keeping box 10 by simply turning the knob 112.

[0032] In order to prevent the knob 112 from moving away from the stopper 113 during the rotation process and affecting the vertical movement of the column 114. Figures 3 to 6On the basis of the above embodiment, in one embodiment, the box cover assembly 110 further includes an elastic member 115. The elastic member 115 is sleeved outside the column 114 and abuts between the elastic sealing pad 111 and the support seat 1132. The elastic member 115 is used to apply an elastic force to the elastic sealing pad 111 in the direction opposite to the support seat 1132. In this way, the column 114 can be continuously pushed downward, and the knob 112 can also be continuously pulled downward, ensuring that the knob 112 is always in abutment with the support seat 1132 during the rotation process. Furthermore, when the sliding portion slides from the end position 11412 to the starting position 11411 to restore the elastic sealing pad 111, the elastic member 115 can also assist the elastic sealing pad 111 to quickly restore.

[0033] Specifically, in this embodiment, the elastic member 115 is a compression spring, which is sleeved outside the column 114 , with one end abutting against the elastic sealing pad 111 and the other end abutting against the support seat 1132 .

[0034] It should be noted that the amount of compression of the compression spring when the sliding portion is located at the starting position 11411 of the guide portion 1141 is less than the amount of compression of the compression spring when the sliding portion is located at the ending position 11412 of the guide portion 1141. In other words, the amount of compression of the compression spring gradually increases as the sliding portion slides from the starting position 11411 to the ending position 11412.

[0035] Specifically, in this embodiment, the guide portion 1141 is an inclined guide groove. The two ends of the inclined guide groove are respectively a starting position 11411 and an end position 11412. The sliding portion is a slider. The slider slides within the inclined guide groove. When the slider is inserted into the inclined guide groove, the knob 112 and the column 114 are rotatably connected.

[0036] Specifically, in this embodiment, Figures 4 to 6 As shown, the starting position 11411 of the inclined guide groove is located to the right of the ending position 11412. Thus, when the knob 112 is rotated clockwise, the slider can slide from the starting position 11411 toward the ending position 11412, and the column 114 moves upward, causing the elastic sealing gasket 111 to convexly deform. When the knob 112 is rotated counterclockwise, the slider can slide from the ending position 11412 toward the starting position 11411, and the column 114 moves downward to the initial position, allowing the elastic sealing gasket 111 to return to its original position.

[0037] Alternatively, in other embodiments, the starting position 11411 of the inclined guide groove is located to the left of the ending position 11412. Thus, when the knob 112 is rotated counterclockwise, the slider can slide from the starting position 11411 toward the ending position 11412, and the column 114 moves upward, causing the elastic sealing gasket 111 to convexly deform. When the knob 112 is rotated clockwise, the slider can slide from the ending position 11412 toward the starting position 11411, and the column 114 moves downward to the initial position, causing the elastic sealing gasket 111 to return to its original position.

[0038] In order to improve the convenience of connection between the knob 112 and the column 114, based on the above embodiment, in one embodiment, as shown in FIG. Figures 4 to 7 As shown, a guide groove 1142 is provided on the outer wall of the column 114. One end of the guide groove 1142 extends through the end of the column 114 facing away from the elastic sealing gasket 111, while the other end of the guide groove 1142 communicates with the diagonal guide groove. Specifically, to connect the knob 112 and the column 114, the column 114 can be inserted into the rotation hole of the knob 112, and the slider can be aligned with the guide groove 1142. In this way, the slider can be inserted into the guide groove 1142 through the end of the guide groove 1142 away from the diagonal guide groove and slide into the diagonal guide groove.

[0039] Furthermore, in order to improve the convenience of inserting the slider into the inclined guide groove, in this embodiment, Figures 4 to 7 As shown, the guide direction of the guide groove 1142 is parallel to the central axis of the column 114. During installation, the slider can be first aligned with the end of the guide groove 1142 away from the oblique guide groove, that is, the top end of the guide groove 1142. Then, the knob 112 is directly pressed down to slide the slider to the other end of the guide groove 1142, that is, the bottom end of the guide groove 1142. Finally, by turning the knob 112 clockwise or counterclockwise, the slider can be slid from the bottom end of the guide groove 1142 into the oblique guide groove.

[0040] Specifically, in this embodiment, Figure 4 and Figure 6 As shown, the guide groove 1142 is connected to the end position 11412 of the oblique guide groove. Since the compression amount of the elastic member 115 when the slider is at the end position 11412 is greater than the compression amount of the elastic member 115 when the slider is at other positions in the oblique guide groove, the elastic member 115 is more difficult to compress at the end position 11412, thereby effectively preventing the slider from sliding out of the oblique guide groove due to accidental operation of the knob 112.

[0041] Optionally, in other embodiments, the introduction groove 1142 is communicated with the starting end of the inclined guide groove.

[0042] When the slider is at the end position 11412, compared to when the slider is at the starting position 11411, the pillar 114 moves upward, driving the elastic sealing gasket 111 to bulge upward, so that the volume of the sealed cavity enclosed by the elastic sealing gasket 111 and the box body 120 becomes larger, thereby improving the vacuum degree in the cavity. In order to keep the slider at the end position 11412, please refer to Figure 4 and Figure 6 In addition to the above embodiment, in one embodiment, a positioning notch 1143 is further provided on the outer wall of the column 114. This notch 1143 is located at the end position 11412 and communicates with the diagonal guide groove. The opening of the notch 1143 faces the elastic sealing gasket 111. Therefore, when the slider slides to the end position 11412, it can be snapped into the positioning notch 1143. Without interference, the slider can remain stably secured in the positioning notch 1143, thereby maintaining a negative pressure in the box body 120.

[0043] To improve the reliability of the cover assembly 110, refer to Figure 3 and Figure 4 On the basis of the above-mentioned embodiment, in one embodiment, the abutting portion 1131 is an annular structure. A circle of flange 1111 is provided on the side of the elastic sealing gasket 111 facing the limiter 113. The flange 1111 is pressed against the inner wall of the opening of the box body 120 by the abutting portion 1131. The column 114 is located in the abutting portion 1131 of the annular structure, and there is a distance between the column 114 and the abutting portion 1131. In this way, when the column 114 is in the process of moving upward, the abutting portion 1131 can firmly abut the elastic sealing gasket 111 against the opening 121 of the box body 120 through the flange 1111, thereby preventing the elastic sealing gasket 111 from separating from the opening 121 of the box body 120 during the upward deformation process.

[0044] See also Figures 4 to 7 Based on the above embodiment, in one embodiment, the outer wall of the column 114 is further provided with a limiting portion 1144, and the limiting portion 1144 extends along the axial direction of the column 114. A through hole 11321 is provided on the support seat 1132, and the column 114 passes through the through hole 11321 and is rotatably connected to the knob 112. A matching portion 11322 is provided on the inner wall of the through hole 11321. The matching portion 11322 is guided and matched with the limiting portion 1144. The column 114 can drive the limiting portion 1144 to move on the matching portion 11322 along the axial direction of the column 114. At the same time, the limiting portion 1144 and the matching portion 11322 can also prevent the limiting member 113 from rotating relative to the column 114 during the rotation of the knob 112.

[0045] Specifically, in this embodiment, the limiting portion 1144 is a groove, and one end of the groove passes through the end of the column 114 facing away from the elastic sealing pad 111. Correspondingly, the matching portion 11322 is a protrusion that is slidably disposed in the groove.

[0046] Optionally, in other embodiments, the limiting portion 1144 is a protrusion, the matching portion 11322 is a groove, and both ends of the groove pass through the support seat 1132 .

[0047] Based on the above embodiment, in one embodiment, Figures 1 to 4 As shown, the box cover assembly 110 further includes an upper cover 116. The upper cover 116 is disposed on a side of the support base 1132 facing away from the elastic sealing pad 111.

[0048] In order to facilitate the user to turn the knob 112, further, in this embodiment, as Figure 2 and Figure 4 As shown, the upper cover 116 is provided with a through hole 1161. The knob 112 is passed through the through hole 1161. Thus, the user can grip the knob 112 through the through hole 1161.

[0049] In one embodiment, the knob 112 is a cylindrical structure, and correspondingly, the through hole 1161 is a circular hole. In order to prevent impurities from entering the support seat 1132 through the through hole 1161, the diameter of the through hole 1161 is adapted to the diameter of the knob 112.

[0050] In order to facilitate the user to turn the knob 112, in one embodiment, as shown in FIG. Figure 2 and Figure 4 As shown, a handle 117 is provided on the top of the knob 112 .

[0051] In order to realize the quick connection between the upper cover 116 and the support base 1132, based on the above embodiment, in one embodiment, as shown in FIG. Figure 4 and Figure 7 As shown, a buckle 118 is provided on one of the side of the support base 1132 facing the upper cover 116 and the side of the upper cover 116 facing the support base 1132, and a slot is provided on the other side. The buckle 118 is engaged with the slot.

[0052] Specifically, multiple buckles 118 and slots are provided and correspond one to one. When multiple buckles 118 are provided on the side of the support base 1132 facing the upper cover 116, the multiple buckles 118 are spaced apart along the circumference of the support base 1132, thereby improving the stability of the connection between the upper cover 116 and the support base 1132.

[0053] In order to quickly position and engage the buckle 118 with the slot, based on the above embodiment, in one embodiment, Figure 1 and Figure 4As shown, a first assembly positioning mark 1191 is provided on the support base 1132. A second assembly positioning mark 1192 is provided on the upper cover 116. When the buckle 118 is engaged with the card slot, the first assembly positioning mark 1191 and the second assembly positioning mark 1192 are arranged relative to each other. Therefore, when assembling the upper cover 116 and the support base 1132, the upper cover 116 or the support base 1132 can be rotated according to the position of the first assembly positioning mark 1191 or the second assembly positioning mark 1192, so that the first assembly positioning mark 1191 and the second assembly positioning mark 1192 are opposite to each other, and then the buckle 118 can be made to correspond to the card slot, thereby improving the assembly efficiency between the upper cover 116 and the support base 1132.

[0054] See also Figures 2 to 4 The present application also provides a fresh-keeping box 10, comprising: a box body 120 and a box cover assembly 110 as described above. A cavity is formed in the box body 120, and an opening 121 communicating with the cavity is provided on the box wall of the box body 120. An elastic sealing gasket 111 is sealed and covers the opening 121. Specifically, when the elastic sealing gasket 111 covers the opening 121, the cavity can be enclosed to form a closed cavity. In this way, the volume of the closed cavity can be changed by pulling the column 114 to deform the convex portion of the elastic sealing gasket 111, thereby increasing the vacuum degree in the closed cavity.

[0055] It should be noted that, in this embodiment, the larger the convex variable on the elastic sealing member is, the greater the vacuum degree in the sealed cavity is, and the better the preservation effect of the fresh-keeping box 10 is.

[0056] Specifically, in this embodiment, when the elastic sealing gasket 111 is not deformed, the volume of the box body 120 is 4410ml. When the slider slides to the end position 11412, the elastic sealing gasket 111 has the largest deformation, causing the volume of the box body 120 to increase by 91.5ml. In addition, when the amount of items placed in the box body 120 is different, that is, the volume of the cavity occupied by the items in the box body 120 is different, after the elastic sealing gasket 111 is pulled up and expanded, the air pressure in the closed cavity will be different. Specifically, please refer to Table 1 below:

[0057]

[0058] As can be seen from the above table, the larger the volume occupied by the items, the lower the air pressure in the box body 120 after expansion, and the greater the vacuum degree.

[0059] In this embodiment, the fresh-keeping box 10 can be used in conjunction with a refrigerator to further improve the vacuum level within the fresh-keeping box 10. Specifically, taking the volume of the box body 120 occupied by items as an example, since air density increases with decreasing temperature, when the fresh-keeping box 10 is placed in the refrigerator's cold storage compartment, the temperature can be considered to drop from 27°C to 5°C. The air density within the box body 120 increases, and the air pressure within the box body 120 further decreases, and the vacuum level can reach 0.813 (dry air) / 0.805 (saturated air), thereby achieving a fresh-keeping effect. In addition, the higher the external ambient temperature of the refrigerator, the more obvious this effect is. For example, when the temperature drops from 32°C to 5°C, the vacuum level within the box body 120 can be reduced to 0.799 (dry air) / 0.787 (saturated air).

[0060] It should be noted that the "dry air" referred to in this embodiment refers to the entire mixed gas in the atmosphere except for water vapor, liquid and solid particles. The "saturated air" referred to in this embodiment refers to the air when the water vapor content reaches the maximum at a certain temperature.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0062] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0065] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A box cover assembly, characterized in that: include: An elastic sealing gasket, the elastic sealing gasket being used to cover the opening of the box body, and a column being provided on a side of the elastic sealing gasket facing away from the box body, the column being provided with a guide portion, the guide direction of the guide portion intersecting with the central axis of the column, the guide portion forming a starting position and an ending position at both ends in the guide direction, and the ending position being closer to the elastic sealing gasket than the starting position; A knob, wherein a rotation hole is formed on a side of the knob facing the elastic sealing gasket, and a sliding portion is formed on an inner wall of the rotation hole; and a limiting member, the limiting member is located between the elastic sealing gasket and the knob, the limiting member includes a connected abutting portion and a support seat, the abutting portion abuts against the elastic sealing gasket so that a gap is formed between the elastic sealing gasket and the support seat, the knob abuts against the support seat, the column passes through the support seat and is inserted into the rotating hole, the sliding portion is guided by the guide portion, and the sliding portion can slide back and forth between the starting position and the ending position, so that the column moves up and down to change the vacuum degree in the box body; In which, the abutment portion is an annular structure, and the elastic sealing gasket is provided with a circle of flange on the side facing the limiter, and the flange is pressed against the inner wall of the opening of the box body by the abutment portion. The column is located in the abutment portion of the annular structure, and there is a distance between the column and the abutment portion.

2. The cover assembly according to claim 1, wherein: The box cover assembly further comprises an elastic member, which is sleeved outside the column and abuts between the elastic sealing pad and the support seat, and is used for applying an elastic force to the elastic sealing pad in a direction opposite to the support seat.

3. The cover assembly according to claim 1, wherein: The guiding portion is an oblique guide groove, the two ends of the oblique guide groove are respectively a starting position and an ending position, and the sliding portion is a slider, which is slidably arranged in the oblique guide groove.

4. The box cover assembly according to claim 3, characterized in that: An introduction groove is provided on the outer wall of the column, and one end of the introduction groove passes through an end of the column facing away from the elastic sealing pad, and the other end of the introduction groove is communicated with the oblique guide groove.

5. The box cover assembly according to claim 4, characterized in that: The guiding direction of the introduction groove is parallel to the central axis of the column, and the introduction groove is connected to the end position of the oblique guide groove.

6. The box cover assembly according to claim 3, characterized in that: A positioning bayonet is further provided on the outer wall of the column. The positioning bayonet is located at the end position and is connected to the oblique guide groove, and the opening of the positioning bayonet faces the elastic sealing pad.

7. The box cover assembly according to any one of claims 1 to 6, characterized in that: The outer wall of the column is also provided with a limiting portion, and the limiting portion extends along the axial direction of the column. A through hole is provided on the support seat, and the column passes through the through hole to be rotatably connected to the knob. The inner wall of the through hole is provided with a matching portion, and the matching portion is guided and matched with the limiting portion, and the column can drive the limiting portion to move on the matching portion along the axial direction of the column.

8. The box cover assembly according to any one of claims 1 to 6, characterized in that: The box cover assembly further comprises an upper cover, which is arranged on a side of the support base facing away from the elastic sealing pad, and the upper cover is provided with a through hole, and the knob is passed through the through hole.

9. A fresh-keeping box, characterized in that: include: The box body and the box cover assembly according to any one of claims 1 to 8, wherein a cavity is formed in the box body, an opening communicating with the cavity is opened on the box wall of the box body, and the elastic sealing gasket seals and covers the opening.

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