US20240150108A1

US20240150108A1 - Vacuum heat-preservation box lid and vacuum heat-preservation lunch box

Info

Publication number: US20240150108A1
Application number: US18/093,974
Authority: US
Inventors: Li Lixin; Zhou Yongning
Original assignee: Ningbo Lisi Houseware Co Ltd
Current assignee: Ningbo Lisi Houseware Co Ltd
Priority date: 2022-11-09
Filing date: 2023-01-06
Publication date: 2024-05-09
Also published as: CN115736466A

Abstract

Disclosed are a vacuum heat-preservation box lid and a vacuum heat-preservation lunch box. The vacuum heat-preservation box lid includes: a box lid body; a frame bracket, the frame bracket being connected to the box lid body, the frame bracket being provided with at least one rotatable fastening lug, the fastening lug being provided with an air release hole plug; and a seal ring, the seal ring being connected to the box lid body, the seal ring being provided with an air release hole for communicating an inside of a box body with the outside. When the fastening lug is snapped shut, the air release hole plug is in interference fit with the air release hole, thus blocking the air release hole. When the fastening lug is opened, the air release hole plug is separated from the air release hole, thus unblocking the air release hole.

Description

BACKGROUND OF THE INVENTION

1. Technical Field

This disclosure belongs to the technical field of heat-preservation lunch boxes and relates to a vacuum heat-preservation box lid, and a vacuum heat-preservation lunch box as well.

2. Description of Related Art

Lunch boxes are very common daily necessities. Many students, working people, and people who go out will take meals with lunch boxes. Heat insulation is one of the important properties of the lunch boxes, the better the heat insulation, the better the heat preservation effect of a lunch box.
For example, an invention patent application CN201310461219.7 discloses a heat-preservation lunch box. The lunch box forms a sealed structure with a box body through a seal ring on a box lid. After hot food inside cools or heated food cools, the inside of the box is in a negative pressure state. It is very difficult to open the lunch box. Although an independent air release hole can be arranged to balance a pressure difference in order to open the box lid, it will affect the sealing effect of the heat-preservation lunch box, and if the box lid itself is not suitable for perforating then it will lose the air release function, so there is still some room for improvement for the lunch box.

BRIEF SUMMARY OF THE INVENTION

An objective of this disclosure is directed to the above problems existing in the prior art and intended to provide a vacuum heat-preservation box lid and a vacuum heat-preservation box as well.
The objective of the present invention can be achieved through the following technical solution: a vacuum heat-preservation box lid, including:

- a box lid body;
- a frame bracket, the frame bracket being connected to the box lid body, the frame bracket being provided with at least one rotatable fastening lug, the fastening lug being provided with an air release hole plug; and
- a seal ring, the seal ring being connected to the box lid body, the seal ring being provided with an air release hole for communicating an inside of a box body with the outside, wherein
- when the fastening lug is snapped shut, the air release hole plug is in interference fit with the air release hole, thus blocking the air release hole; when the fastening lug is opened, the air release hole plug is separated from the air release hole, thus unblocking the air release hole.

Preferably, the box lid body is configured as a hollow structure and the inside of the box lid body is vacuumed to form a vacuum cavity.
Preferably, the box lid body includes first and second sheets formed by stamping, the first sheet and the second sheet being brought together and connected by welding, the vacuum cavity being located between the first sheet and the second sheet.
Preferably, the box lid body is provided with a circle of step portions with a zigzag cross-section at an edge of its lower surface, and the seal ring is fitted over the step portions and is stuck by the step portions.
Preferably, the frame bracket is provided with a fastening block and mounted on an upper surface of the box lid body, and the fastening block is fastened to the edge of the lower surface of the box lid body so that the frame bracket is fixed to the box lid body.
Preferably, a decorative recess is formed on the upper surface of the box lid body, an air void for vacuuming is formed in the decorative recess, and a decorative sheet is arranged in the decorative recess and covers the air void.
Preferably, the air release hole runs laterally through the seal ring, and two ends of the air release hole are located on outer and inner sides of the seal ring, respectively.
Preferably, the seal ring is configured as a lip-shaped seal ring with a lip inward.
Further provided is a vacuum heat-preservation lunch box, including the vacuum heat-preservation box lid and further including a box body, when the vacuum heat-preservation box lid is connected to the box body, the box lid body being connected to the box body by means of a seal ring and the fastening lug being fastened to the box body.
Preferably, the box body is configured as a double-layer metal structure, and the box body has a vacuum inner cavity formed by vacuumizing between two metal layers.
Compared with the prior art, this disclosure has the following beneficial effects:

- 1. The air release hole formed in the seal ring can play an air release function and can provide the air release function for some box lids that can not be perforated. When the fastening lug is snapped shut, the box body can be fastened so that the box lid body and the box body are connected together to form a sealed heat preservation structure, and moreover the air release hole can also be blocked by the air release hole plug. To open the box lid, by opening the fastening lug, the box lid body can be unlocked from the box body and the air release hole plug can also be pulled out so that the negative pressure in the box body can be balanced through the air release hole.
- 2. The box lid body is configured as a hollow structure, and the cavity inside the box lid body is vacuumed to form a vacuum cavity. Since the box lid body has a vacuum cavity inside, which can play the effect of vacuum heat preservation. By virtue of the vacuum cavity, the loss of heat can be blocked, which greatly improves the heat preservation effect of the box lid body.
- 3. The box lid body is actually configured as a double-layer metal shell structure. In the existing processing technology, it is impossible to directly process a hollow box lid structure. In order to provide this box lid body which is vacuum inside, this implementation is carried out in a way that two sheets are firstly manufactured separately, then the two sheets are welded together, and finally vacuumizing operation is performed, thus obtaining the box lid body with a vacuum cavity.
- 4. Since the frame bracket and the box lid body are configured as removable structures, the box lid body can be disassembled and cleaned conveniently.
- 5. Since the box body is configured as a double-layer structure including an inner layer and an outer layer, i.e., a double-layer metal structure, a vacuum inner cavity is formed between the two metal layers, the vacuum inner cavity and the vacuum cavity have the similar effect, and they both achieve the heat preservation effect by their vacuum structures.
- 6. The box body and the box lid body are actually all-metal structures. The lunch box generally achieves the heat preservation effect through the vacuum structures, so the lunch box has a very good heat preservation effect.
- 7. The solution in which the box lid body is configured as a hollow structure and has a vacuum cavity inside is closely combined with the solution in which the air release hole is formed in the seal ring and sealed by the air release hole plug and they belong to a complete technical solution. Since the box lid body is in a double-layer sealed hollow shell structure, the inside of the box lid body needs to be sealed, or otherwise it can not guarantee the vacuum effect of the vacuum cavity. If the air release hole formed in the box lid body or the box body will increase the way of heat dissipation, the heat preservation effect will be reduced. Specifically, if the air release hole is added, heat will also be dissipated through heat conduction from the metal part at the air release hole. For the above reasons, forming the air release hole in the seal ring and arranging the air release hole plug on the fastening lug can achieve the effect of automatically balancing the negative pressure when the box lid is opened, and it also can avoid forming an air release hole in the box lid body. Air release can be achieved without forming an air release hole in the box lid body, which achieves the structural integrity of the box lid body and meets the requirement for air release. The overall structure is very ingenious, and the box lid has the advantages of vacuum heat preservation and automatic air release to balance the negative pressure.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a vacuum heat-preservation lunch box according to this disclosure.

FIG. 2 is an exploded view of the vacuum heat-preservation lunch box according to this disclosure.

FIG. 3 is a schematic structural diagram of a seal ring and a fastening lug according to this disclosure.

FIG. 4 is a schematic structural diagram of a vacuum heat-preservation box lid according to this disclosure.

FIG. 5 is a schematic structural diagram of the vacuum heat-preservation box lid according to this disclosure when closed.

FIG. 6 is a schematic structural diagram of the vacuum heat-preservation box lid according to this disclosure when opened.

FIG. 7 is a schematic structural diagram of a box lid body according to this disclosure.

FIG. 8 is a schematic diagram of a first sheet and a second sheet according to this disclosure before welding.

In the figures, 100, box lid body; 110, vacuum cavity; 120, first sheet; 130, second sheet; 140, decorative groove; 150, air void; 160, decorative sheet; 170, step portion; 200, frame bracket; 210, fastening block; 300, fastening lug; 310, air release hole plug; 400, seal ring; 410, air release hole; 500, box body; and 510, vacuum inner cavity.

DETAILED DESCRIPTION OF THE INVENTION

The following are specific embodiments of the present invention and further describe the technical solutions of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in FIGS. 1 to 8 , provided is a vacuum heat-preservation box lid, including: a box lid body 100, a frame bracket 200 and a seal ring 400. The frame bracket 200 is connected to the box lid body 100. The frame bracket 200 is provided with at least one rotatable fastening lug 300, and the fastening lug 300 is provided with an air release hole plug 310. The seal ring 400 is connected to the box lid body 100. The seal ring 400 is provided with an air release hole 410 for communicating an inside of a box body 500 with the outside. When the fastening lug 300 is snapped shut, the air release hole plug 310 is in interference fit with the air release hole 410, thus blocking the air release hole 410. When the fastening lug 300 is opened, the air release hole plug 410 is separated from the air release hole 410, thus unblocking the air release hole 410.
The frame bracket 200 can be assembled on the box lid body 100 and is provided to provide a fastening lug structure for the box lid body 100. The fastening lug 300 is connected to the frame bracket 200 by a hinge structure or at a weak part, so that the fastening lug 300 can be rotated relative to the frame bracket 200, thereby implementing the opening action (upward rotation) of the fastening lug 300 or closing action (downward rotation) of the fastening lug 300. The seal 400 is fixed to a lower surface of the box lid body 100. When the box lid body 100 covers the box body 500, the seal ring 400 comes into contact with the box body 500 and ensures the sealing performance between the box lid body 100 and the box body 500.
On the basis of the above basic structure, this solution cleverly forms the air release hole 410 in the seal ring 400 and arranges the air release hole plug 310 on the fastening lug 300, and the opening action and the closing action of fastening lug 300 can realize the connection and separation of the air release hole plug 310 and the air release hole 410.
It should be specially noted here that the air release hole 410 formed in the seal ring 400 can play an air release function, which can provide the air release function for some box lids that cannot be perforated.
When the fastening lug 300 is snapped shut, the box body 500 can be fastened 500 so that the box lid body 100 and the box body 500 are connected together to form a sealed heat preservation structure, and moreover the air release hole 410 can also be blocked by the air release hole plug 310. To open the box lid, by opening the fastening lug 300, the box lid body 300 can be unlocked from the box body 500 and the air release hole plug 310 can also be pulled out so that the negative pressure in the box body 500 can be balanced through the air release hole 410.
As shown in FIGS. 1, 2, and 5 to 8 , the box lid body 100 is configured as a hollow structure and the inside of the box lid body 100 is vacuumed to form a vacuum cavity 110.
Different from the existing box lid structure, the box lid body 100 in this embodiment is preferably configured as a metal part. The box lid body 100 here is configured as a hollow structure, and the cavity inside the box lid body 100 is vacuumed to form a vacuum cavity 110. Since the box lid body 100 has the vacuum cavity 110 inside, which can play the effect of insulating the heat transfer. By virtue of the vacuum cavity 110, the loss of heat can be blocked, which greatly improves the heat preservation effect of the box lid body 100.
It should be specially noted here that the solution in which the box lid body 100 is configured as a hollow structure and has the vacuum cavity 110 inside is closely combined with the solution in which the air release hole 410 is formed in the seal ring 400 and sealed by the air release hole plug 310 and they belong to a complete technical solution. Since the box lid body 100 is in a double-layer sealed hollow shell structure, the inside of the box lid body 100 needs to be sealed, otherwise it can not guarantee the vacuum effect of the vacuum cavity 110. If the air release hole formed in the box lid body 100 or the box body 500 will increase the way of heat dissipation, the heat preservation effect will be reduced. Specifically, if an air release hole is added, heat will also be dissipated through heat conduction from metal parts at the air release hole. For the above reasons, forming the air release hole 410 in the seal ring 400 and arranging the air release hole plug on the fastening lug 300 can achieve the effect of automatically balancing the negative pressure when the box lid is opened, and it also can avoid forming the air release hole 100 in the box lid body. Air release can be achieved without forming the air release hole 410 in the box lid body 100, which achieves the structural integrity of the box lid body 100 and meets the requirement for air release. The overall structure is very ingenious, and the box lid has the advantages of vacuum heat preservation and automatic air release to balance the negative pressure.
Preferably, the box lid body 100 includes first and second sheets 120 and 130 formed by stamping, the first sheet 120 and the second sheet 130 are brought together and connected by welding, and the vacuum cavity 110 is located between the first sheet 120 and the second sheet 130.
The box lid body 100 is actually configured as a double-layer metal shell structure. Since it is impossible to directly process a one-piece hollow box lid structure, in order to provide this box lid body 100 which is vacuum inside, this implementation is carried out in a way that two sheets are firstly manufactured separately, then the two sheets are welded together, and finally vacuumizing operation is performed, thus obtaining the box lid body 100 with the vacuum cavity 110.
Specifically, the two metal sheets are first shaped by a stamping process, i.e., the first sheet 120 and the second sheet 130 are manufactured first; next, the first sheet 120 and the second sheet 130 are brought together, and a hollow structure is formed between the first sheet 120 and the second sheet 130; then, the first sheet 120 and the second sheet 130 are fixed together by welding to form a box lid body 100, and then the air between the first sheet 120 and the second sheet 130 is removed by vacuumizing to form a sealed vacuum cavity 110 between the first sheet 120 and the second sheet 130.
Preferably, the first sheet 120 and the second sheet 130 are arranged corresponding to each other and one above the other, and the position where the first sheet 120 and the second sheet 130 are welded is located on an outer periphery of the box lid body 100. In an actual structure, the first sheet 120 and the second sheet 130 are two thin sheet structures, and edges of the two thin sheet structures are folded over. The first sheet 120 forms the upper surface of the box lid body 100, and the second sheet 130 forms the lower surface of the box lid body 100. In this way, the welding operation can be facilitated and the box lid body 100 formed has a beautiful and flat surface.
Preferably, the box lid body 100 is provided with a circle of step portions 170 with a zigzag cross-section at an edge of the lower surface, and the seal ring 400 is fitted over the step portions 170 and is stuck by the step portions 170, so the seal ring will not fall off easily.
As shown in FIGS. 1 to 4 , the frame bracket 200 is provided with a fastening block 210 and mounted on the upper surface of the box lid body 100, and the fastening block 210 is fastened to the edge of the lower surface of the box lid body 100 so that the frame bracket 200 is fixed to the box lid body 100.
The frame bracket 200 and the box lid body 100 are configured as removable structures, so the box lid body 100 can be disassembled and cleaned conveniently. In an actual structure, the fastening block 210 is similar to an elastic sheet jaw, an inner side of the fastening block 210 is provided with a raised rib, and the raised rib can catch the edge of the lower surface of the box lid body 100. During disassembly, the fastening block 210 is pulled outward, and then the frame bracket 200 can be lifted up and taken out. During installation, it is simply a matter of fitting the frame bracket 200 from the top down and causing the raised rib of the fastening block 210 to catch the edge of the lower surface of the box lid body 100.
As shown in FIGS. 1 and 2 , a decorative recess 140 is formed on the upper surface of the box lid body 100, an air void 150 for vacuuming is formed in the decorative recess 140, and a decorative sheet 160 is arranged in the decorative recess 140 and covers the air void 150.
It should be noted here that since the box lid body 100 needs to form the vacuum cavity 110 inside through the vacuumizing process, and the air void 150 is a structure that must exist for the vacuumizing process. The box lid body 100 in this solution cannot be obtained without the air void 150, but the air void 150 presents a concave structure in appearance. For the overall beauty of the box lid, the air void 150 is specially formed in the decorative recess 140 and then covered by the decorative sheet 160.
As shown in FIGS. 1 to 6 , the air release hole 410 runs laterally through the seal ring 400, and two ends of the air release hole 410 are located on outer and inner sides of the seal ring 400, respectively. It should be noted here that the air release hole 410 is configured as a side hole structure. When the box lid body 100 covers the box body 500, an inner side of the seal ring 400 is located inside the box body 500, and an outer side of the seal ring 400 is located outside the box body 500. The side hole-shaped air release hole 410 can communicate the inside of the box 500 with the outside to balance the negative pressure. Moreover, the air release hole 410 is configured as a side hole shape to match the movement track of the air release hole plug 310. When the fastening lug 300 is snapped shut, the air release hole plug 310 is inserted into the air release hole 410 from the outer side of the seal ring 400 in a lateral direction, so that the air release hole plug 310 can better block the air release hole 410.
Preferably, the seal ring 400 is configured as a lip-shaped seal ring 400 with a lip inward, and since the seal ring 400 is sealed between the box lid body 100 and the box body 500, when the air release hole plug 310 is inserted into the air release hole 410, the seal ring 400 is driven to produce a local expansion deformation and a stronger sealing effect can be achieved between the box lid body 100 and the box body 500. In addition, it can also improve the sealing effect of the air release hole plug 310 on the air release hole 410. Since the air release hole plug 310 is larger than the air release hole 410, when the air release hole plug 310 is inserted into the air release hole 410, it can force the air release hole 410 to deform and then the air release hole and the air release hole plug come into interference fit, thereby completely blocking the air release hole 410.
Preferably, the fastening lug 300 is further provided with a catching block to be locked on the box body 500, and the catching block can lock the box body 500 when the fastening lug 300 is snapped shut.
As shown in FIGS. 1 to 8 , further provided is a vacuum heat-preservation lunch box, including the vacuum heat-preservation box lid and further including a box body 500. When the vacuum heat-preservation box lid is connected to the box body 500, the box lid body 100 is connected to the box body 500 by means of the seal ring 400 and the fastening lug 300 is fastened to the box body 500 through the catching block.
In an actual structure, the box body 500 has an avoidance portion corresponding to the location of the air release hole 410, and interference between the box body 500 and the air release hole plug 310 can be avoided when the air release hole plug 310 is inserted into the air release hole 410.
Preferably, the box body 500 is configured as a double-layer metal structure, and the box body 500 has a vacuum inner cavity 510 formed by vacuumizing between two metal layers.
In this embodiment, the box body 500 is configured as a metal box body 500, and the box body has the effect of vacuum heat preservation. The structural principle of the box body 500 having the effect of vacuum heat preservation is similar to that of the box lid body 100. Specifically, since the box body 500 is configured as a double-layer structure including an inner layer and an outer layer, i.e., a double-layer metal structure, a vacuum inner cavity 510 is formed between the two metal layers, the vacuum inner cavity 510 and the vacuum cavity 110 have the similar effect, and they both achieve the heat preservation effect by their vacuum structures.
It should be added that in this solution, the box body 500 and the box lid body 100 are actually all-metal structures. The lunch box generally achieves the heat preservation effect through the vacuum structures, so the lunch box has a very good heat preservation effect.
It should be noted that all directional indications (such as up, down, left, right, front, back . . . ) in the embodiments of the present invention are only used to explain a relative positional relationship, motion, etc. between the various components in a specific attitude (as shown in the accompanying drawings). If the specific attitude changes, the directional indications will also change accordingly.
In addition, descriptions such as “first”, “second”, “one”, etc. in the present invention are only used for description purposes, and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defined by the term “first” or “second” may include at least one of the features, either explicitly or implicitly.
In the present invention, unless otherwise expressly specified and defined, the terms “connected”, “fixed” and the like should be understood in a broad sense. For example, the connection may be either a fixed connection or a detachable connection, or in one piece; it may be a mechanical connection, or it may be an electrical connection; it may be a direct connection or indirect connection through an intermediate medium, and may be an internal communication of two components or an interaction relationship between two components, unless otherwise expressly defined.
In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but must be based on the implementation by those of ordinary skill in the art. When the combination of technical solutions contradicts each other or cannot be implemented, it should be considered that such combination of technical solutions does not exist and does not fall within the scope of the present invention.

Claims

1. A vacuum heat-preservation box lid comprising:

a box lid body;

a frame bracket, the frame bracket being connected to the box lid body, the frame bracket being provided with at least one rotatable fastening lug, the fastening lug being provided with an air release hole plug; and

a seal ring, the seal ring being connected to the box lid body, the seal ring being provided with an air release hole for communicating an inside of a box body with an outside, wherein

when the fastening lug is snapped shut, the air release hole plug is in interference fit with the air release hole, thus blocking the air release hole; when the fastening lug is opened, the air release hole plug is separated from the air release hole, thus unblocking the air release hole.

2. The vacuum heat-preservation box lid according to claim 1, wherein the box lid body is configured as a hollow structure and the inside of the box lid body is vacuumed to form a vacuum cavity.

3. The vacuum heat-preservation box lid according to claim 2, wherein the box lid body comprises first and second sheets formed by stamping, the first sheet and the second sheet are brought together and connected by welding, and the vacuum cavity is located between the first sheet and the second sheet.

4. The vacuum heat-preservation box lid according to claim 3, wherein the box lid body is provided with a circle of step portions with a zigzag cross-section at an edge of its lower surface, and the seal ring is fitted over the step portions and is stuck by the step portions.

5. The vacuum heat-preservation box lid according to claim 1, wherein the frame bracket is provided with a fastening block and mounted on an upper surface of the box lid body, and the fastening block is fastened to the edge of the lower surface of the box lid body so that the frame bracket is fixed to the box lid body.

6. The vacuum heat-preservation box lid according to claim 3, wherein a decorative recess is formed on the upper surface of the box lid body, an air void for vacuuming is formed in the decorative recess, and a decorative sheet is arranged in the decorative recess and covers the air void.

7. The vacuum heat-preservation box lid according to claim 1, wherein the air release hole runs laterally through the seal ring, and two ends of the air release hole are located on outer and inner sides of the seal ring, respectively.

8. The vacuum heat-preservation box lid according to claim 7, wherein the seal ring is configured as a lip-shaped seal ring with a lip inward.

9. A vacuum heat-preservation lunch box comprising the vacuum heat-preservation box lid according to claim 1 and further comprising a box body 500, when the vacuum heat-preservation box lid is connected to the box body, the box lid body being connected to the box body by the seal ring and the fastening lug 300 being fastened to the box body.

10. The vacuum heat-preservation lunch box according to claim 9, wherein the box body is configured as a double-layer metal structure, and the box body has a vacuum inner cavity formed by vacuumizing between two metal layers.