Preservation box and sealing cover assembly thereof

Abstract

The utility model discloses a fresh-keeping box and a sealing cover assembly thereof, the sealing cover assembly comprises an elastic element, a housing, a pressing part, a bottom flow control valve and a top flow control valve, the pressing part can move up and down and is installed on the housing in a sealing mode, so that a flow control cavity with a variable space is formed between the housing and the pressing part, and the top flow control valve is installed on the bottom flow control valve. The bottom penetrating hole of the housing and the top penetrating hole of the pressing part are respectively communicated with the flow control cavity, the bottom flow control valve is arranged in the bottom penetrating hole of the housing and can open or close the bottom penetrating hole of the housing, and the top flow control valve is arranged in the top penetrating hole of the pressing part and can open or close the bottom penetrating hole of the housing. The top flow control valve can open or close the top through hole of the pressing part, and the elastic element abuts against the housing and the pressing part in the flow control cavity. By continuously pressing and releasing the pressing part, the bottom flow control valve and the top flow control valve can be matched with each other to exhaust air in the preservation box so as to realize preservation of food materials.

Description

Technical Field

[0001] The utility model relates to a fresh-keeping box, in particular to a fresh-keeping box and a sealing cover assembly thereof. Background Art

[0002] The push-type vacuum pump is a device used to extract the air from the fresh-keeping box. It gradually extracts the air from the fresh-keeping box by being pressed continuously, so that a negative pressure environment is formed in the fresh-keeping box, thereby achieving the effect of extending the shelf life of the food in the fresh-keeping box. The existing fresh-keeping box and the push-type vacuum pump are independent. When in use, the vacuum port of the push-type vacuum pump needs to be aligned with the exhaust port of the fresh-keeping box. In this way, when the push-type vacuum pump is pressed, the air in the fresh-keeping box can be extracted through the exhaust port. In order to ensure the vacuum efficiency, during the vacuum process, the vacuum port of the push-type vacuum pump needs to be always aligned with the exhaust port of the fresh-keeping box. However, the pressure applied to the push-type vacuum pump by the user is not always vertical. That is, the user may cause the push-type vacuum pump to tilt while pressing the push-type vacuum pump, which may lead to the vacuum port of the push-type vacuum pump and the exhaust port of the fresh-keeping box being unable to be aligned. Once the vacuum port of the push-type vacuum pump and the exhaust port of the fresh-keeping box are not aligned, the air in the fresh-keeping box cannot be extracted. Utility Model Content

[0003] One object of the utility model is to provide a fresh-keeping box and a sealing cover assembly thereof, wherein the sealing cover assembly is integrated with an exhaust function, so that the air in the fresh-keeping box can be efficiently exhausted.

[0004] One object of the utility model is to provide a fresh-keeping box and a sealing cover assembly thereof, wherein a pressing portion of the sealing cover assembly is movable up and down and sealingly installed on a cover shell, and a flow control cavity with a variable space is formed between the pressing portion and the cover shell, and when the pressing portion is pressed, a bottom flow control valve provided at a bottom perforation of the cover shell and a top flow control valve provided at a top perforation of the pressing portion cooperate with each other to extract air from the fresh-keeping box, so that the sealing cover assembly is integrated with an exhaust function.

[0005] One object of the utility model is to provide a fresh-keeping box and a sealing cover assembly thereof, wherein after the air is exhausted, the locking cover of the sealing cover assembly can lock the pressing part to prevent the pressing part from being further pressed. In particular, the locking cover can lock the pressing part at the top of the pressing part, which is conducive to reducing the overall height of the fresh-keeping box, so that the fresh-keeping box is convenient to store and carry.

[0006] One object of the utility model is to provide a fresh-keeping box and a sealing cover assembly thereof, wherein when the locking cover releases the pressing part and allows the pressing part to be pressed, the locking cover can guide the movement direction of the pressing part to prevent the pressing part from tilting.

[0007] One object of the utility model is to provide a fresh-keeping box and a sealing cover assembly thereof, wherein the locking cover can lock the pressing part or release the pressing part by rotating the pressing part, thereby making the fresh-keeping box easy to operate.

[0008] According to one aspect of the present invention, the present invention provides a sealing cover assembly, which includes:

[0009] an elastic element;

[0010] a cover, wherein the cover has a bottom through hole;

[0011] a pressing portion, wherein the pressing portion has a top through hole, the pressing portion is movably mounted on the housing in an upward and downward manner and sealed to form a flow control cavity with a variable space between the housing and the pressing portion, the bottom through hole of the housing and the top through hole of the pressing portion are respectively connected to the flow control cavity;

[0012] a bottom flow control valve, wherein the bottom flow control valve is disposed at the bottom through hole of the housing, and the bottom flow control valve is capable of opening or closing the bottom through hole of the housing; and

[0013] A top flow control valve, wherein the top flow control valve is arranged at the top through-hole of the pressing portion, and the top flow control valve can open or close the top through-hole of the pressing portion, wherein the elastic element is arranged in the flow control chamber, and the bottom and top of the elastic element respectively abut against the cover shell and the pressing portion.

[0014] According to one embodiment of the utility model, the cover shell has a receiving groove with a top opening, the bottom of the pressing portion is received in the receiving groove of the cover shell, and the bottom of the pressing portion can move up and down along the receiving groove of the cover shell, so that the space of the flow control cavity formed between the cover shell and the pressing portion is variable.

[0015] According to one embodiment of the utility model, the sealing cover assembly further includes a locking cover, the locking cover has a locking cover through-hole, the pressing part penetrates into the locking cover through-hole of the locking cover so that the locking cover is sleeved on the pressing part, and the locking cover is fixedly mounted on the cover shell, wherein the sealing cover assembly has a locking state and a releasing state, and the sealing cover assembly switches between the locking state and the releasing state by rotating the pressing part, when the sealing cover assembly is in the locking state, the locking cover locks the pressing part to prevent the pressing part from moving up and down, and when the sealing cover assembly is in the releasing state, the locking cover releases the pressing part to allow the pressing part to move up and down.

[0016] According to one embodiment of the utility model, the locking cover has at least one locking protrusion, which protrudes into the through hole of the locking cover, wherein the pressing portion has at least one locking groove, which extends along the circumferential direction of the pressing portion, and the locking protrusion of the locking cover can enter or exit the locking groove of the pressing portion by rotating the pressing portion, when the locking protrusion of the locking cover enters the locking groove of the pressing portion, the sealing cover assembly is in the locked state, and when the locking protrusion of the locking cover exits the locking groove of the pressing portion, the sealing cover assembly is in the released state.

[0017] According to an embodiment of the present utility model, the locking groove of the pressing portion is located at the top of the pressing portion.

[0018] According to an embodiment of the present invention, from a top view, the locking protrusion of the locking cover and the bottom of the pressing portion have an overlapping portion.

[0019] According to one embodiment of the utility model, the bottom of the cover shell has a supporting ring body extending downward and at least one notch arranged at the bottom of the ring body, the supporting ring body forms the bottom through-hole of the cover shell, and the notch is connected to the bottom through-hole of the cover shell, wherein the bottom flow control valve is made of rubber material or silicone material in one piece, and the bottom flow control valve includes a sealing cover, an anti-detachment cover and a first assembly column extending between the sealing cover and the anti-detachment cover, the first assembly column is located at the bottom through-hole of the cover shell, the sealing cover is deformably arranged in the receiving groove of the cover shell, the anti-detachment cover is supported by the supporting ring body, the size of the first assembly column is smaller than the size of the bottom through-hole of the cover shell, the size of the sealing cover and the size of the anti-detachment cover are both larger than the size of the bottom through-hole of the cover shell, and from a top view, the sealing cover covers the bottom through-hole of the cover shell, and the sealing cover opens or closes the bottom through-hole of the cover shell in a deformed manner.

[0020] According to one embodiment of the utility model, the pressing part includes a main body part and a cap body part, the cap body part is installed on the main body part, the pressing part forms an active space between the cap body part and the main body part and a gap connecting the active space and the external environment, the top perforation of the pressing part is formed in the main body part, the top perforation is located below the active space and the top perforation is connected to the active space, the flow control chamber is formed between the main body part and the cover shell, wherein the top flow control valve includes a second assembly column and a sealing cap arranged on the top of the second assembly column, the sealing cap is located in the active space of the pressing part, the second assembly column is inserted into the top perforation of the pressing part, the size of the second assembly column is smaller than the size of the top perforation of the pressing part, the size of the sealing cap is larger than the size of the top perforation of the pressing part, and from a top view, the sealing cap covers the top perforation of the pressing part, and the sealing cap opens or closes the top perforation of the pressing part by moving up and down.

[0021] According to another aspect of the utility model, the utility model further provides a fresh-keeping box, which includes a box body and a sealing cover assembly, wherein the sealing cover assembly is detachably mounted on the box body, wherein the sealing cover assembly includes:

[0022] an elastic element;

[0023] a cover, wherein the cover has a bottom through hole;

[0024] a pressing portion, wherein the pressing portion has a top through hole, the pressing portion is movably mounted on the housing in an upward and downward manner and sealed to form a flow control cavity with a variable space between the housing and the pressing portion, the bottom through hole of the housing and the top through hole of the pressing portion are respectively connected to the flow control cavity;

[0025] a bottom flow control valve, wherein the bottom flow control valve is disposed at the bottom through hole of the housing, and the bottom flow control valve is capable of opening or closing the bottom through hole of the housing; and

[0026] A top flow control valve, wherein the top flow control valve is arranged at the top through-hole of the pressing portion, and the top flow control valve can open or close the top through-hole of the pressing portion, wherein the elastic element is arranged in the flow control chamber, and the bottom and top of the elastic element respectively abut against the cover shell and the pressing portion.

[0027] According to one embodiment of the utility model, the sealing cover assembly further includes a pressure relief valve, which is arranged on the cover shell, wherein the cover shell has an assembly through hole, wherein the pressure relief valve includes a valve body, a spring and a retaining ring, the valve body has a valve column and a pressing cap arranged on the top of the valve column, the diameter of the valve column is smaller than the diameter of the assembly through hole of the cover shell, the diameter of the pressing cap is larger than the diameter of the assembly through hole of the cover shell, the bottom end of the valve column is fitted with the retaining ring after passing through the assembly through hole of the cover shell, the spring is fitted on the valve column, and the top and bottom ends of the spring respectively abut against the pressing cap and the cover shell, and the retaining ring can open or close the assembly through hole of the cover shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of a fresh-keeping box according to a preferred embodiment of the utility model.

[0029] Figure 2 It is a schematic diagram of an exploded view of the fresh-keeping box according to the above preferred embodiment of the utility model from one perspective.

[0030] Figure 3 It is a schematic diagram of an exploded view of the fresh-keeping box according to the above preferred embodiment of the utility model from another perspective.

[0031] Figure 4 It is a schematic diagram of an exploded view of a sealing cover assembly of the fresh-keeping box according to the above preferred embodiment of the utility model from one perspective.

[0032] Figure 5 It is a schematic diagram of an exploded view of the sealing cover assembly of the fresh-keeping box according to the above preferred embodiment of the utility model from another perspective.

[0033] Figure 6 It is a cross-sectional schematic diagram of the position of the fresh-keeping box according to the above preferred embodiment of the utility model.

[0034] Figure 7 It is a cross-sectional schematic diagram of another position of the fresh-keeping box according to the above preferred embodiment of the utility model.

[0035] Figure 8 It is a three-dimensional schematic diagram of the fresh-keeping box according to the above preferred embodiment of the utility model when unlocked.

[0036] Fig. 9 It is a cross-sectional schematic diagram of the fresh-keeping box after being unlocked according to the above preferred embodiment of the utility model.

[0037] Fig.10It is a partial three-dimensional schematic diagram of the fresh-keeping box after being unlocked according to the above preferred embodiment of the utility model.

[0038] Fig.11 It is a three-dimensional schematic diagram of the fresh-keeping box after being unlocked according to the above preferred embodiment of the utility model.

[0039] Figures 12 to 15 They are respectively schematic diagrams of the operation process of the fresh-keeping box according to the above preferred embodiments of the utility model. DETAILED DESCRIPTION

[0040] Before describing in detail any embodiment of the utility model, it should be understood that the utility model is not limited to the construction and arrangement details of the components described below or illustrated in the following figures in its application. The utility model can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for the purpose of description and should not be considered as restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0041] Furthermore, on the first aspect, in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0042] Refer to the attached drawings of the specification of this utility model Figures 1 to 15 A fresh-keeping box according to a preferred embodiment of the utility model will be disclosed and explained in the following description, wherein the fresh-keeping box includes a sealing cover assembly 10 and a box body 20, and the sealing cover assembly 10 can be detachably installed on the box body 20.

[0043] The box body 20 has a box body space 21 and a box body opening 22 connected to the box body space 21. The box body space 21 can hold food. After the sealing cover assembly 10 is installed on the box body 20, the sealing cover assembly 10 can close the box body opening 22 of the box body 20, so that the user can use the fresh-keeping box to hold food.

[0044] The specific shape of the box body 20 is not limited in the fresh-keeping box of the present invention. For example, the shape of the box body 20 can be cylindrical, square or conical.

[0045] Reference Figures 4 to 15 The sealing cover assembly 10 includes a cover shell 11, a pressing portion 12, a bottom flow control valve 13, a top flow control valve 14 and an elastic element 15, and the sealing cover assembly 10 has a flow control chamber 101 with a variable space, wherein the cover shell 11 has a bottom through hole 111, and the pressing portion 12 has a top through hole 121. The pressing portion 12 is movably installed on the cover shell 11 up and down and sealed to form the flow control chamber 101 between the cover shell 11 and the pressing portion 12, and the bottom through hole 111 of the cover shell 11 and the top through hole 121 of the pressing portion 12 are respectively connected to the flow control chamber 101, wherein the The bottom flow control valve 13 is arranged at the bottom perforation 111 of the cover shell 11, and the bottom flow control valve 13 can open or close the bottom perforation 111 of the cover shell 11, wherein the top flow control valve 14 is arranged at the top perforation 121 of the pressing part 12, and the top flow control valve 14 can open or close the top perforation 121 of the pressing part 12, wherein the elastic element 15 is arranged in the flow control cavity 101 of the sealing cover assembly 10, and the bottom and top of the elastic element 15 respectively abut against the cover shell 11 and the pressing part 12, so that the sealing cover assembly 10 can integrate the vacuum function.

[0046] Specifically, when the pressing portion 12 is pressed downward, the space of the flow control chamber 101 of the sealing cover assembly 10 is compressed. Since the bottom flow control valve 13 is in a state of closing the bottom perforation 111 of the cover shell 11, as the pressure in the flow control chamber 101 of the sealing cover assembly 10 increases, the top flow control valve 14 opens the top perforation 121 of the pressing portion 12 to allow the air in the flow control chamber 101 of the sealing cover assembly 10 to be discharged through the top perforation 121 of the pressing portion 12. In this process, the pressing portion 12 compresses the elastic element 15 toward the cover shell 11, so that the elastic element 15 accumulates elastic potential energy due to compression and deformation. When the pressure applied to the pressing portion 12 is cancelled, the elastic element 15 pushes the pressing portion 12 upwards in the process of restoring the initial state, so that the space of the flow control chamber 101 of the sealing cover assembly 10 increases. Since the top flow control valve 14 is in a state of closing the top perforation 121 of the pressing portion 12, as the pressure in the flow control chamber 101 of the sealing cover assembly 10 decreases, the bottom flow control valve 13 opens the bottom perforation 111 of the cover shell 11 to allow the air in the box body space 21 of the box body 20 to enter the flow control chamber 101 of the sealing cover assembly 10 through the bottom perforation 111 of the cover shell 11. By repeatedly pressing and releasing the pressing portion 12, the air in the box body space 21 of the box body 20 can be evacuated, so that a negative pressure environment is formed in the fresh-keeping box, so as to achieve the effect of extending the shelf life of the food in the fresh-keeping box.

[0047] It can be understood that when the pressing portion 12 is pressed downward, the bottom flow control valve 13 is in a state of closing the bottom through hole 111 of the cover shell 11 because the pressure in the flow control cavity 101 of the sealing cover assembly 10 is greater than the pressure in the box body space 21 of the box body 20. When the pressure applied to the pressing portion 12 is withdrawn, the top flow control valve 14 is in a state of closing the top through hole 121 of the pressing portion 12 because the pressure of the external environment is greater than the pressure in the flow control cavity 101 of the sealing cover assembly 10.

[0048] In a specific example of the fresh-keeping box of the present invention, refer to the attached Figure 4 , Figure 6 and Figure 7The cover shell 11 has a receiving groove 112 with an opening at the top, the bottom of the pressing portion 12 is received in the receiving groove 112 of the cover shell 11, and the bottom of the pressing portion 12 can move up and down in the receiving groove 112 of the cover shell 11, so that the space of the flow control cavity 101 of the sealing cover assembly 10 formed between the cover shell 11 and the pressing portion 12 is variable. It can be understood that by providing the receiving groove 112 in the cover shell 11 and the bottom of the pressing portion 12 being received in the receiving groove 112 of the cover shell 11 in a manner that it can move up and down, not only can the flow control cavity 101 of the sealing cover assembly 10 be formed between the cover shell 11 and the pressing portion 12, but also it is conducive to reducing the overall height size of the fresh-keeping box, so that the fresh-keeping box is convenient to store and carry.

[0049] In order to increase the sealing effect between the pressing portion 12 and the cover shell 11, refer to the attached Figures 4 to 7 The sealing cover assembly 10 further includes a first sealing ring 16, which is fixedly mounted on the pressing portion 12, and the outer side of the first sealing ring 16 is in close contact with the inner wall of the cover shell 11 for forming the receiving groove 112. In this way, when the pressing portion 12 drives the first sealing ring 16 to move up and down to change the space size of the control chamber 101 of the sealing cover assembly 10, the first sealing ring 16 is always in close contact with the inner wall of the cover shell 11 for forming the receiving groove 112, thereby avoiding air leakage between the pressing portion 12 and the cover shell 11, thereby improving the air extraction efficiency.

[0050] Preferably, the pressing portion 12 has a first slot 122 surrounding the bottom of the pressing portion 12 , wherein the inner side of the first sealing ring 16 is inserted into the first slot 122 of the pressing portion 12 , so that the first sealing ring 16 is prevented from sliding relative to the pressing portion 12 .

[0051] Further, the sealing cover assembly 10 includes a second sealing ring 17, which is arranged at the edge of the cover shell 11. When the sealing cover assembly 10 is installed on the box body 20 and closes the box body opening 22 of the box body 20, the second sealing ring 17 is clamped between the cover shell 11 and the box body 20 to prevent air leakage due to a gap between the cover shell 11 and the box body 20. Preferably, the cover shell 11 has a second clamping groove 113 surrounding the cover shell 11, wherein the top of the second sealing ring 17 is clamped into the second clamping groove 113 of the cover shell 11, so that the second sealing ring 17 can be prevented from falling from the cover shell 11.

[0052] Reference Figures 4 to 7 , Figures 9 to 11The sealing cover assembly 10 further includes a locking cover 18, and the locking cover 18 has a locking cover through hole 181, wherein the pressing portion 12 penetrates the locking cover through hole 181 of the locking cover 18, so that the locking cover 18 is sleeved on the pressing portion 12, and the locking cover 18 is fixedly mounted on the housing 11. In other words, the locking cover 18 allows the top of the pressing portion 12 to be exposed, so that the user can press the pressing portion 12 conveniently. In a specific example of the fresh-keeping box of the present invention, the locking cover 18 can lock and release the pressing part 12, wherein when the locking cover 18 locks the pressing part 12, the sealing cover assembly 10 is in a locked state, and the locking cover 18 prevents the pressing part 12 from moving up and down. Correspondingly, when the locking cover 18 releases the pressing part 12, the sealing cover assembly 10 is in a released state, and the locking cover 18 allows the pressing part 12 to move up and down, that is, the sealing cover assembly 10 can switch between the locked state and the released state.

[0053] Specifically, by rotating the pressing portion 12 , the sealing cover assembly 10 can be switched between the locked state and the released state, so that the user can operate the fresh-keeping box easily. More specifically, the locking cover 18 has at least one locking protrusion 182, and the locking protrusion 182 protrudes into the locking cover through-hole 181, and the pressing portion 12 has at least one locking groove 123, and the locking groove 123 extends along the circumferential direction of the pressing portion 12. By rotating the pressing portion 12, the locking protrusion 182 of the locking cover 18 can enter or exit the locking groove 123 of the pressing portion 12, wherein when the locking protrusion 182 of the locking cover 18 enters the locking groove 123 of the pressing portion 12, the locking cover 18 locks the pressing portion 12, so that the sealing cover assembly 10 is in the locked state, and accordingly, when the locking protrusion 182 of the locking cover 18 exits the locking groove 123 of the pressing portion 12, the locking cover 18 releases the pressing portion 12, so that the sealing cover assembly 10 is in the released state.

[0054] Preferably, in the attached Figures 1 to 15 In this specific example of the fresh-keeping box of the utility model shown, the number of the locking protrusions 182 of the locking cover 18 is two, and the two locking protrusions 182 are symmetrical to each other. Correspondingly, the number of the locking grooves 123 of the pressing portion 12 is two, and the two locking grooves 123 are symmetrical to each other, so that when the pressing portion 12 is rotated, the two locking protrusions 182 of the locking cover 18 can enter the two locking grooves 123 of the pressing portion 12 at the same time, or the two locking protrusions 182 of the locking protrusion 18 can exit the two locking grooves 123 of the pressing portion 12 at the same time.

[0055] Preferably, the locking groove 123 of the pressing portion 12 is located at the top of the pressing portion 12, so that when the locking cover 18 locks the pressing portion 12 and the sealing cover assembly 10 is in the locked state, it is helpful to reduce the overall height of the fresh-keeping box, so that the fresh-keeping box is convenient to store and carry. That is, the locking cover 18 locks the pressing portion 12 at the top of the pressing portion 12.

[0056] More preferably, from a top view, the locking protrusion 182 of the locking cover 18 and the bottom of the pressing portion 12 have an overlapping portion, so that when the locking cover 18 releases the pressing portion 12 and the sealing cover assembly 10 is in the released state, the locking cover 18 can prevent the bottom of the pressing portion 12 from falling from the receiving groove 112 of the cover shell 11.

[0057] It can be understood that since the bottom of the pressing portion 12 is received in the receiving groove 112 of the cover shell 11 in a manner that the outer side of the first sealing ring 16 of the pressing portion 12 is tightly attached to the inner wall of the cover shell 11 for forming the receiving groove 112, and the locking cover 18 is mounted on the middle part of the pressing portion 12, the locking cover 18 can guide the movement of the pressing portion 12 and only allow the pressing portion 12 to move up and down, thereby preventing the pressing portion 12 from tilting.

[0058] It is worth mentioning that the specific manner in which the lock cover 18 is fixedly mounted on the housing 11 is not limited in the fresh-keeping box of the present invention. Figures 4 to 6 The inner wall of the cover shell 11 for forming the receiving groove 112 is provided with at least one first assembly groove 114 and at least one first guide groove 115, the first assembly groove 114 extends along the circumferential direction of the cover shell 11, and the first guide groove 115 extends upward from one end of the first assembly groove 114 to the top surface of the cover shell 11, and the locking cover 18 has at least one first assembly block 183. After the first assembly block 183 of the locking cover 18 slides to one end of the first assembly groove 114 through the first guide groove 115 of the cover shell 11, the locking cover 18 is rotated to make the first assembly block 183 of the locking cover 18 slide to the other end of the first assembly groove 114 of the cover shell 11, so as to realize the state of the locking cover 18 and the cover shell 11, thereby fixing the locking cover 18 to the cover shell 11. Optionally, in other examples of the fresh-keeping box of the present invention, the locking cover 18 can be bonded or welded to the cover shell 11 so that the locking cover 18 is fixedly mounted on the cover shell 11 .

[0059] Reference Figures 3 to 7The bottom of the cover shell 11 has a support ring 116 extending downward and at least one notch 117 provided on the support ring 116 . The support ring 116 forms the bottom through hole 111 of the cover shell 11 , and the notch 117 is connected to the bottom through hole 111 .

[0060] The bottom flow control valve 13 includes a sealing cover 131, an anti-detachment cover 132, and a first assembly column 133 extending between the sealing cover 131 and the anti-detachment cover 132. The sealing cover 131, the first assembly column 133, and the anti-detachment cover 132 can be made of rubber material or silicone material in one piece, wherein the first assembly column 133 is located at the bottom through hole 111 of the housing 11, and the sealing cover 131 is deformably arranged in the receiving groove 112 of the housing 11. The anti-detachment cover 132 is supported by the supporting ring body 116, the size of the first assembly column 133 is smaller than the size of the bottom through hole 111 of the cover shell 11, the size of the sealing cover 131 and the size of the anti-detachment cover 132 are both larger than the size of the bottom through hole 111 of the cover shell 11, and from a top view, the sealing cover 131 covers the bottom through hole 111 of the cover shell 11, and the sealing cover 131 opens or closes the bottom through hole 111 of the cover shell 11 in a deformed manner.

[0061] When the sealing cover 131 of the bottom flow control valve 13 is deformed upward and a gap is generated between the sealing cover 131 and the inner wall of the housing 11 for forming the receiving groove 112, the air in the box body space 21 of the box body 20 can enter the flow control cavity 101 of the sealing cover assembly 10 through the notch 117 and the bottom through hole 111 of the housing 11 and the gap. It can be understood that, since the anti-detachment cover 132 of the bottom flow control valve 13 is supported by the support ring body 116 of the housing 11, when the sealing cover 131 is deformed upward and has a tendency to cause the bottom flow control valve 13 to detach from the bottom through hole 111 of the housing 11, the support ring body 116 of the housing 11 prevents the bottom flow control valve 13 from detaching from the bottom through hole 111 of the housing 11 by supporting the anti-detachment cover 132.

[0062] Preferably, the number of the notches 117 of the cover shell 11 may be multiple, and they are arranged along the circumferential direction of the supporting ring body 116 .

[0063] The pressing part 12 includes a main body 124 and a cap body 125, and the pressing part 12 has an active space 126 and a gap 127 connecting the active space 126 and the external environment. The cap body 125 is installed on the main body 124, and the active space 126 and the gap 127 of the pressing part 12 are formed between the main body 124 and the cap body 125. The top through hole 121 of the pressing part 12 is formed in the main body 124, and the top through hole 121 is located below the active space 126 and the top through hole 121 is connected to the active space 126. The bottom of the main body 124 is movably received in the receiving groove 112 of the cover shell 11, so that the flow control cavity 101 of the sealing cover assembly 10 can be formed between the main body 124 and the cover shell 11. That is to say, the cap body portion 125 of the pressing portion 12 does not participate in forming the flow control cavity 101 of the sealing cover assembly 10 .

[0064] The top flow control valve 14 includes a second assembly column 141 and a sealing cap 142 arranged on the top of the second assembly column 141, the sealing cap 142 is located in the active space 126 of the pressing part 12, the second assembly column 141 is inserted into the top perforation 121 of the pressing part 12, the size of the second assembly column 141 is smaller than the size of the top perforation 121 of the pressing part 12, the size of the sealing cap 142 is larger than the size of the top perforation 121 of the pressing part 12, and from a top view, the sealing cap 142 covers the top perforation 121 of the pressing part 12, and the sealing cap 142 opens or closes the top perforation 121 of the pressing part 12 by moving up and down.

[0065] When the sealing cap 142 of the top flow control valve 14 moves upward to open the top through hole 121 of the pressing portion 12, the air in the flow control chamber 101 of the sealing cover assembly 10 can be discharged through the top through hole 121 of the pressing portion 12 and the movable space 126 and the gap 127 of the pressing portion 12. It can be understood that the cap body portion 125 limits the upward movement distance of the sealing cap 142 of the top flow control valve 14 to prevent the second assembly column 141 from falling off from the top through hole 121 of the pressing portion 12, thereby ensuring that the sealing cap 142 can move downward to a position that closes the top through hole 121 of the pressing portion 12.

[0066] It is worth mentioning that the specific manner in which the cap portion 125 is mounted on the main body portion 124 is not limited in the fresh-keeping box of the present invention. Figures 4 to 6 The cap body portion 125 has a cap cavity 1251 with a bottom opening, at least one second assembly groove 1252 and at least one second guide groove 1253, the second assembly groove 1252 and the second guide groove 1253 are respectively arranged on the inner wall of the cap body portion 125 for forming the cap cavity 1251, the second assembly groove 1252 and the second guide groove 1253 are respectively connected to the cap cavity 1251, the second assembly groove 1252 extends along the circumferential direction of the cap body portion 125, and the second guide groove 1253 extends downward from one end of the second assembly groove 1252 Extending to the end face of the cap body part 125, the main body part 124 has at least one second assembly block 1241. After the second assembly block 1241 of the main body part 124 slides to one end of the second assembly groove 1252 through the second guide groove 1253 of the cap body part 125, the main body part 124 or the cap body part 125 is rotated to make the second assembly block 1241 of the main body part 124 slide to the other end of the second assembly groove 1252 of the cap body part 125, so as to install the cap body part 125 on the main body part 124.

[0067] Continue to refer to the attached Figure 7 The cover shell 11 has a limiting ring 118, and the limiting ring 118 extends upward to the flow control chamber 101 of the sealing cover assembly 10, wherein the elastic element 15 is a compression spring, and its bottom end is pressed against the cover shell 11 in a manner of being sleeved on the limiting ring 118, so that the elastic element 15 will not slide sideways, whether in the process of the elastic element 15 being compressed or in the process of the reset spring 15 resting on its initial state, so as to ensure that the elastic element 15 is pressed against the cover shell 11 and the pressing portion 12 in the flow control chamber 101 of the sealing cover assembly 10.

[0068] Further, see Attachment Figures 2 to 5 , Figure 7 The sealing cover assembly 10 further includes a pressure relief valve 19, which is arranged on the cover shell 11, wherein the pressure relief valve 19 is used to restore the box body space 21 of the box body 20 to normal pressure, so as to separate the sealing cover assembly 10 from the box body 20.

[0069] Attached Figure 7The specific structure of the pressure relief valve 19 and the assembly relationship between the pressure relief valve 19 and the housing 11 are shown. Specifically, the housing 11 has an assembly through hole 119, the pressure relief valve 19 includes a valve body 191, a spring 192 and a retaining ring 193, the valve body 191 has a valve column 1911 and a pressing cap 1912 disposed on the top of the valve column 1911, the diameter of the valve column 1911 is smaller than the diameter of the assembly through hole 119 of the housing 11, and the diameter of the pressing cap 1912 is larger than the diameter of the assembly through hole 119 of the housing 11. 119 in diameter, the bottom end of the valve column 1911 is fitted with the retaining ring 193 after passing through the assembly through hole 119 of the housing 11 to prevent the valve body 191 from falling from the housing 11, and the retaining ring 193 can open or close the assembly through hole 119 of the housing 11, wherein the spring 192 is fitted on the valve column 1911, and the top end of the spring 192 abuts against the pressing cap 1912, and the bottom end abuts against the housing 11.

[0070] Preferably, the bottom end of the valve column 1911 has a third groove 19111 , and the inner side of the retaining ring 193 is inserted into the third groove 19111 of the valve column 1911 to prevent the retaining ring 193 from falling off the bottom end of the valve column 1911 .

[0071] When the pressing cap 1912 of the valve body 191 of the pressure relief valve 19 is not pressed, the spring 192 pushes the pressing cap 1912 upward to allow the pressing cap 1912 to drive the snap ring 193 to move upward through the valve column 1911, so that the snap ring 193 closes the assembly through-hole 119 of the cover shell 11 in the box body space 21 of the box body 20. When the pressing cap 1912 is pressed downward, the pressing cap 1912 drives the snap ring 193 to move downward through the valve column 1911 to open the assembly through-hole 119 of the cover shell 11. At this time, the air of the external environment can enter the box body space 21 of the box body 20 through the assembly through-hole 119 of the cover shell 11, so that the box body space 21 of the box body 20 returns to normal pressure, thereby facilitating the separation of the sealing cover assembly 10 from the box body 20.

[0072] Attached Figures 12 to 15 The operation process of the fresh-keeping box is shown.

[0073] First, refer to the attached Fig.12After the pressing part 12 is rotated, the locking projection 182 of the locking cover 18 exits the locking groove 123 of the pressing part 12, so that the locking cover 18 releases the pressing part 12 and the sealing cover assembly 10 switches from the locking state to the releasing state. At this time, the elastic element 15 pushes the pressing part 12 upward to enlarge the space of the flow control cavity 101 of the sealing cover assembly 10. The locking cover 18 limits the maximum upward movement of the pressing part 12 by blocking the bottom of the pressing part 12, so as to prevent the pressing part 12 from falling off the housing 11.

[0074] Secondly, refer to the attached Fig.13 When the pressing portion 12 is pressed downward, the space of the flow control chamber 101 of the sealing cover assembly 10 is compressed to increase the pressure in the flow control chamber 101. As the pressure in the flow control chamber 101 of the sealing cover assembly 10 increases, on the one hand, the air in the flow control chamber 101 causes the sealing cover 131 of the bottom flow control valve 13 to be closely attached to the inner wall of the housing 11 for forming the receiving groove 112, so that the bottom flow control valve 13 maintains the closing of the housing 11. The bottom perforation 111 is in a state, on the other hand, the air in the flow control chamber 101 causes the top flow control valve 14 to move upward to open the top perforation 121 of the pressing portion 12, so that the air in the flow control chamber 101 is discharged through the top perforation 121 of the pressing portion 12, the movable space 126 and the gap 127, and on the other hand, the pressing portion 12 compresses the elastic element 15 toward the cover shell 11, so that the elastic element 15 is deformed and accumulates elastic potential energy.

[0075] Again, refer to the attached Fig.14 When the pressure applied to the pressing portion 12 is released, the elastic element 15 pushes the pressing portion 12 upward in the process of restoring the initial state, so that the space of the flow control chamber 101 of the sealing cover assembly 10 increases to reduce the pressure in the flow control chamber 101. As the pressure in the flow control chamber 101 of the sealing cover assembly 10 decreases, on the one hand, the air in the external environment causes the top flow control valve 14 to move downward and close the top through-hole 121 of the pressing portion 12. On the other hand, the air in the box body space 21 of the box body 20 pushes the sealing cover 131 of the bottom flow control valve 13 upward to deform, thereby generating a gap between the sealing cover 131 and the inner wall of the cover shell 11 for forming the receiving groove 112. The air in the box body space 21 of the box body 20 enters the flow control chamber 101 of the sealing cover assembly 10 through the notch 117 and the bottom through-hole 111 of the cover shell 11 and the gap.

[0076] By repeatedly pressing and releasing the pressing portion 12, the air in the box body space 21 of the box body 20 can be evacuated to form a negative pressure environment in the fresh-keeping box, thereby achieving the effect of extending the shelf life of the food in the fresh-keeping box.

[0077] Reference Fig.15 When pressure relief is required, the pressing cap 1912 interface of the valve body 191 is pressed downward to allow the retaining ring 193 to open the assembly through-hole 119 of the cover shell 11, so as to allow air from the external environment to enter the box body space 21 of the box body 20 through the assembly through-hole 119 of the cover shell 11, so as to restore the box body space 21 of the box body 20 to normal pressure, thereby facilitating the separation of the sealing cover assembly 10 from the box body 20.

[0078] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A sealing cover assembly, characterized in that: include: an elastic element; a cover, wherein the cover has a bottom through hole; a pressing portion, wherein the pressing portion has a top through hole, the pressing portion is movably mounted on the housing in an upward and downward manner and sealed to form a flow control cavity with a variable space between the housing and the pressing portion, the bottom through hole of the housing and the top through hole of the pressing portion are respectively connected to the flow control cavity; a bottom flow control valve, wherein the bottom flow control valve is disposed at the bottom through hole of the housing, and the bottom flow control valve can open or close the bottom through hole of the housing; as well as A top flow control valve, wherein the top flow control valve is arranged at the top through-hole of the pressing portion, and the top flow control valve can open or close the top through-hole of the pressing portion, wherein the elastic element is arranged in the flow control chamber, and the bottom and top of the elastic element respectively abut against the cover shell and the pressing portion.

2. The sealing cover assembly according to claim 1, wherein the cover shell has a receiving groove with a top opening, the bottom of the pressing portion is received in the receiving groove of the cover shell, and the bottom of the pressing portion can move up and down along the receiving groove of the cover shell so that the space of the flow control chamber formed between the cover shell and the pressing portion is variable.

3. The sealing cover assembly according to claim 2, wherein the sealing cover assembly further comprises a locking cover, the locking cover having a locking cover through-hole, the pressing portion penetrates into the locking cover through-hole of the locking cover so that the locking cover is sleeved on the pressing portion, and the locking cover is fixedly mounted on the cover shell, wherein the sealing cover assembly has a locking state and a releasing state, and the sealing cover assembly switches between the locking state and the releasing state by rotating the pressing portion, when the sealing cover assembly is in the locking state, the locking cover locks the pressing portion to prevent the pressing portion from moving up and down, and when the sealing cover assembly is in the releasing state, the locking cover releases the pressing portion to allow the pressing portion to move up and down.

4. The sealing cover assembly according to claim 3, wherein the locking cover has at least one locking protrusion, and the locking protrusion protrudes into the locking cover through-hole, wherein the pressing portion has at least one locking groove, and the locking groove extends along the circumferential direction of the pressing portion, and the locking protrusion of the locking cover can enter or exit the locking groove of the pressing portion by rotating the pressing portion, when the locking protrusion of the locking cover enters the locking groove of the pressing portion, the sealing cover assembly is in the locked state, and when the locking protrusion of the locking cover exits the locking groove of the pressing portion, the sealing cover assembly is in the released state. The sealing cover assembly according to claim 4 , wherein the locking groove of the pressing portion is located at a top of the pressing portion. 6 . The sealing cover assembly according to claim 4 , wherein the locking protrusion of the locking cover and the bottom of the pressing portion have an overlapping portion when viewed from a top view.

7. A sealing cover assembly according to any one of claims 2 to 6, wherein the bottom of the cover shell has a supporting ring body extending downward and at least one notch arranged at the bottom of the ring body, the supporting ring body forming the bottom through-hole of the cover shell, and the notch communicating with the bottom through-hole of the cover shell, wherein the bottom flow control valve is made of a rubber material or a silicone material in one piece, and the bottom flow control valve comprises a sealing cover, an anti-detachment cover and a first assembly column extending between the sealing cover and the anti-detachment cover, the first assembly column is located at the bottom through-hole of the cover shell, the sealing cover is deformably arranged in the receiving groove of the cover shell, the anti-detachment cover is supported by the supporting ring body, the size of the first assembly column is smaller than the size of the bottom through-hole of the cover shell, the size of the sealing cover and the size of the anti-detachment cover are both larger than the size of the bottom through-hole of the cover shell, and from a top view, the sealing cover covers the bottom through-hole of the cover shell, and the sealing cover opens or closes the bottom through-hole of the cover shell in a deformed manner.

8. A sealing cover assembly according to any one of claims 1 to 6, wherein the pressing part includes a main body part and a cap body part, the cap body part is installed on the main body part, the pressing part forms an active space between the cap body part and the main body part and a gap connecting the active space and the external environment, the top perforation of the pressing part is formed in the main body part, the top perforation is located below the active space and the top perforation is connected to the active space, the flow control chamber is formed between the main body part and the cover shell, wherein the top flow control valve includes a second assembly column and a sealing cap arranged on the top of the second assembly column, the sealing cap is located in the active space of the pressing part, the second assembly column is inserted into the top perforation of the pressing part, the size of the second assembly column is smaller than the size of the top perforation of the pressing part, the size of the sealing cap is larger than the size of the top perforation of the pressing part, and from a top view, the sealing cap covers the top perforation of the pressing part, and the sealing cap opens or closes the top perforation of the pressing part by moving up and down.

9. Fresh-keeping box, characterized in that: include: A box body; and The sealing cover assembly according to any one of claims 1 to 8, wherein the sealing cover assembly is detachably mounted on the box body.

10. The fresh-keeping box according to claim 9, wherein the sealing cover assembly further includes a pressure relief valve, which is arranged on the cover shell, wherein the cover shell has an assembly through-hole, wherein the pressure relief valve includes a valve body, a spring and a retaining ring, the valve body has a valve column and a pressing cap arranged on the top of the valve column, the diameter of the valve column is smaller than the diameter of the assembly through-hole of the cover shell, the diameter of the pressing cap is larger than the diameter of the assembly through-hole of the cover shell, the bottom end of the valve column is fitted with the retaining ring after passing through the assembly through-hole of the cover shell, the spring is fitted on the valve column, and the top and bottom ends of the spring respectively abut against the pressing cap and the cover shell, and the retaining ring can open or close the assembly through-hole of the cover shell.

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