Combined closed food container

Abstract

The combined closed food container comprises a cover body, an outer box body with an opening and an inner box body with an opening, and an annular groove which is formed by an inner groove wall, a groove top and an outer groove wall and is provided with a downward opening is formed in the peripheral edge of the cover body; the opening of the outer box body is provided with a box opening composite edge composed of an inner straight edge, a flat edge and an outer straight edge, and the annular groove is buckled on the box opening composite edge in a sleeved mode. The inner box body is sleeved in the outer box body, and a gap is reserved between the bottoms of the inner box body and the outer box body; a box opening straight edge is arranged at the opening of the inner box body, the inner groove wall of the annular groove of the cover body, the box opening straight edge of the inner box body and the inner straight edge of the box opening composite edge of the outer box body are sequentially stacked from inside to outside, and every two adjacent box opening straight edges abut against each other to be in sealing fit; the upper end of the box opening straight edge extends outwards to form a supporting edge, and the supporting edge is erected on the flat edge of the box opening composite edge of the outer box body. The whole container is closed, the sealing structure at the opening edge is excellent in performance, and heat loss can be effectively reduced when food is heated or hot food is distributed.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing for ultra-thin injection molding, and specifically to a combined airtight food container made of ultra-thin plastics. Background Art

[0002] With the continuous research and development and maturity of ultra-thin injection molding technology, in the prior art, for the definition of ultra-thin plastic products, according to industry practice, the ratio of flow length to wall thickness is generally used to describe. Plastic molding materials with a ratio of flow length to wall thickness greater than 100:1 are called thin-walled parts, and plastic containers with a ratio of flow length to wall thickness greater than 150:1 are called ultra-thin plastic containers.

[0003] The thermal expansion coefficient of plastic materials (100 - 200x10-6) is greater than that of common metal materials (10 - 20x10-6) / glass materials (0.5 - 15x10-6). For existing ultra-thin plastic containers, restricted by the thermal expansion coefficient of plastic materials and the easy deformation caused by ultra-thin molding processes, the sealing structure at the mouth edge generally adopts the traditional top-holding wire seal or the fitting surface seal. Both of the above two sealing structures are difficult to avoid the inherent poor fitting accuracy of their materials. When the container expands and deforms due to heat, it is very easy to cause the sealing of the container to fail and leak.

[0004] In addition, in order to overcome the defect that traditional ultra-thin containers have only a single accommodation space, Chinese Utility Model Patent CN202542112 U discloses a new type of fully sealed ultra-thin food container, which adopts a double-box structure. Specifically, it includes a box cover, an open outer box body and an open inner box body that are adapted to each other. The box cover is provided with a downward-opening annular groove formed by an inner groove wall, a groove top and an outer groove wall; the outer box body is provided with a box mouth double edge formed by an inner straight edge, a flat edge and an outer straight edge, and the groove is sleeved on the box mouth double edge; the inner groove wall of the groove is attached to the inner straight edge of the box mouth double edge and a lock is provided at the attachment point to form an inner sealing structure; the outer straight edge of the box mouth double edge extends downward and outward, and its lower end abuts against the inner side surface of the outer groove wall of the groove to form an outer sealing structure. The inner box body is sleeved inside the outer box body and its height is less than that of the outer box body. An annular support step is provided at the lower end of the inner straight edge of the outer box body, and a support edge for mounting the inner box body on this annular support step is provided at the box mouth of the inner box body. There is a notch recessed inward into the inner box body at the box mouth of the inner box body. A small hole for discharging water vapor is opened on the box cover, and the water vapor inside the outer box body rises from the notch of the inner box body and is then discharged through this small hole, which can prevent the sealing performance between the outer box body and the box cover from decreasing due to the upward arching deformation of the box cover caused by water vapor.

[0005] For the above-mentioned new type of fully sealed ultra-thin food container, the support edge of its inner box body is mounted on the annular support step located at the lower end of the inner straight edge of the outer box body. When applied to food heating or hot food delivery, the following problems exist: 1. The sealing performance at the container mouth edge is achieved only through the sealing fit between the outer box body and the box cover. The inner box body does not participate in the sealing fit. Since the thermal expansion coefficient of ultra-thin plastic is relatively high (several times higher than that of glass or metal materials), when the container is heated, obvious expansion will occur in the radial direction of the container. When the outer box body contains a heating agent, hot soup, or hot drink, the hot steam generated by this heating agent, hot soup, or hot drink will heat and keep warm the inner box body. The hot steam in the outer box body rises from the notch of the inner box body to the box cover, and the hot steam generated by the inner box body also rises to the box cover. The temperature of the box cover is much higher than that of the outer box body. In the inner sealing structure formed by the inner groove wall of the annular groove of the box cover and the inner straight edge of the box mouth double edge of the outer box body, the radial expansion degree of the annular groove of the box cover is much larger than that of the box mouth double edge of the outer box body. Deviation will occur in the matching accuracy of the locking part of the inner sealing structure and the abutting part of the outer sealing structure between the outer box body and the box cover, and the sealing performance at the container mouth edge is unstable, with the defect of sealing leakage. Moreover, since the box cover is relatively light, if the radial expansion of the box cover is too large, it is easy to cause the box cover to bounce off from the mouth edge of the outer box body.

[0006] 2. In this utility model patent, in order to solve the problem that the box cover is easy to bounce off due to excessive expansion, small holes for discharging water vapor are provided on the box cover. However, in this way, the whole container is not a closed container, and the heat energy in the container continuously dissipates to the outside of the container through these small holes, resulting in relatively large heat loss and poor heat preservation / heating effect. Summary of the Invention

[0007] The purpose of the present invention is to provide a combined closed food container, whose sealing performance of the sealing fit structure at the mouth edge is better, and the whole container is in a closed state, which can effectively reduce heat loss during food heating or hot food delivery and has a better heat preservation / heating effect.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions: Combined airtight food container, including a lid, an open outer box body and an open inner box body. The peripheral edge of the lid is provided with a downward-opening annular groove formed by an inner groove wall, a groove top and an outer groove wall. At the opening of the outer box body, there is a box mouth double edge formed by an inner straight edge, a flat edge and an outer straight edge. The annular groove of the lid is nested and buckled on the box mouth double edge of the outer box body. The outer straight edge of the box mouth double edge is in abutting cooperation with the outer groove wall of the annular groove, or the extension of the outer straight edge of the box mouth double edge is in abutting cooperation with the extension of the outer groove wall of the annular groove. The inner box body is sleeved inside the outer box body, and there is a gap between the bottom of the inner box body and the bottom of the outer box body. At the opening of the inner box body, there is a box mouth straight edge. The inner groove wall of the annular groove of the lid, the box mouth straight edge of the inner box body and the inner straight edge of the box mouth double edge of the outer box body are stacked in sequence from inside to outside, and the adjacent two are mutually pressed for sealing cooperation to form an inner sealing structure. The upper end of the box mouth straight edge of the inner box body extends outward to form a support edge, and the support edge is erected on the flat edge of the box mouth double edge of the outer box body.

[0009] Further, the inner groove wall of the annular groove of the lid and the box mouth straight edge of the inner box body are mutually pressed and there is an angle of 1-12 degrees between them. The box mouth straight edge of the inner box body and the inner straight edge of the box mouth double edge of the outer box body are mutually pressed and there is an angle of 1-12 degrees between them. Or, a partial area of the inner groove wall of the annular groove of the lid or / and a partial area of the box mouth straight edge of the inner box body elastically deforms and the two deformations fit together to form an inner deformation self-locking area. A partial area of the box mouth straight edge of the inner box body or / and a partial area of the inner straight edge of the box mouth double edge of the outer box body elastically deforms and the two deformations fit together to form an outer deformation self-locking area. Or, the adjacent two of the inner groove wall of the annular groove of the lid, the box mouth straight edge of the inner box body and the inner straight edge of the box mouth double edge of the outer box body are in sealing cooperation through protrusions.

[0010] Further, the outer groove wall of the annular groove of the lid and the outer straight edge of the box mouth double edge of the outer box body are in mutual abutting for sealing cooperation to form an outer sealing structure. Or, the extension of the outer groove wall of the annular groove of the lid and the extension of the outer straight edge of the box mouth double edge of the outer box body are in mutual abutting for sealing cooperation to form an outer sealing structure.

[0011] Further, there is an annular gap between the circumferential side wall of the box body main body of the inner box body and the circumferential side wall of the box body main body of the outer box body. A sealing sheet that is in sealing cooperation with the opening of the inner box body is covered at the opening of the inner box body. There is a gap between the upper surface of the sealing sheet and the cover plate of the lid, and a holding member is arranged on the upper surface of the sealing sheet.

[0012] Further, the intersection of the flat edge of the double-folded edge of the outer box body and the outer straight edge of the double-folded edge of the outer box body is indented inward, leaving a gap below the outer end of the support edge.

[0013] Further, the intersection of the flat edge of the double-folded edge of the outer box body and the outer straight edge of the double-folded edge of the outer box body is in an arc chamfer shape; alternatively, the upper section of the outer straight edge of the double-folded edge of the outer box body is in an inclined plane shape.

[0014] Further, the outer end of the support edge of the inner box body has an extension extending downward along the outer straight edge of the double-folded edge of the outer box body, and a first locking mechanism is used for locking and cooperating between the extension and the corresponding part of the outer straight edge of the double-folded edge of the outer box body.

[0015] Further, a second locking mechanism for locking the lower end of the extension is provided on the outer groove wall of the annular groove of the cover body.

[0016] Further, a third locking mechanism is used for locking and cooperating between the outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body.

[0017] Further, a fourth locking mechanism is provided between the outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body. This fourth locking mechanism is located below the third locking mechanism and corresponds to the state where only the cover body and the outer box body are fitted together.

[0018] Further, it further includes another inner box body with an open mouth. The another inner box body is sleeved inside the outer box body, and the inner box body is sleeved inside the another inner box body. There are corresponding spaces left between the bottom and the circumferential side wall of the another inner box body and the bottom and the circumferential side wall of the outer box body, forming an air isolation heat preservation layer surrounding the box body main body of the another inner box body. There is also a space left between the bottom of the inner box body and the bottom of the another inner box body, forming an accommodation space for containing heating agents or hot soups or hot drinks; a box mouth straight edge is provided at the opening of the another inner box body, and the upper end of the box mouth straight edge of the another inner box body extends outward to form a support edge. A support step is provided at or below the lower end of the inner straight edge of the outer box body, and the support edge of the another inner box body is erected on the support step.

[0019] Further, the inner box body is sleeved inside the outer box body, and the other inner box body is sleeved inside the inner box body. There are corresponding gaps between the bottom and the circumferential side wall of the inner box body and the bottom and the circumferential side wall of the outer box body, forming an air isolation heat preservation layer surrounding the box body main body of the inner box body. There is also a gap between the bottom of the other inner box body and the bottom of the inner box body, forming an accommodation space for containing heating agents, hot soups or hot drinks. At the lower end or below the straight edge of the box mouth of the inner box body, there is a support step, and the support edge of the other inner box body is erected on the support step of the inner box body.

[0020] Further, the straight edge of the box mouth of the inner box body is connected to the box body main body of the inner box body by a flat edge of the box mouth, and through ventilation holes are opened along the thickness direction on the flat edge of the box mouth.

[0021] After adopting the above scheme, for a combined airtight food container of the present invention, the opening of its inner box body is provided with a straight edge of the box mouth, and the upper end of the straight edge of the box mouth extends outward to form a support edge, and this support edge is erected on the flat edge of the double-edge of the box mouth of the outer box body. The inner groove wall of the annular groove of the cover body, the straight edge of the box mouth of the inner box body, and the inner straight edge of the double-edge of the box mouth of the outer box body are sequentially stacked from inside to outside, and the adjacent two are mutually pressed for sealing cooperation. Compared with the prior art, it has the following advantages: 1. The inner groove wall of the annular groove of the cover body, the straight edge of the box mouth of the inner box body, and the inner straight edge of the double-folded edge of the box mouth of the outer box body are sequentially stacked from the inside to the outside, and the adjacent two are pressed against each other for sealing fit, forming a multi-layered composite inner sealing structure. Since the coefficient of thermal expansion of ultra-thin plastic is relatively high (several times higher than that of glass or metal materials), when heated, the container will expand significantly in the radial direction. When a heating agent or hot soup or hot drink is placed in the outer box body, the hot steam generated by the heating agent or hot soup or hot drink is blocked by the inner box body, and is concentrated on heating the bottom and the body of the inner box body, and will not rise to the cover body. In this way, the temperature of the inner box body in the whole container is the highest. In the multi-layered composite inner sealing structure formed by the inner groove wall of the annular groove of the cover body, the straight edge of the box mouth of the inner box body, and the inner straight edge of the double-folded edge of the box mouth of the outer box body, the radial expansion degree of the straight edge of the box mouth of the inner box body is relatively large, while the radial expansion degrees of the inner groove wall of the annular groove of the cover body and the inner straight edge of the double-folded edge of the box mouth of the outer box body are relatively small. On the one hand, it is not necessary for the container to open an exhaust hole on the cover body as in the prior art to prevent the cover body from expanding too much radially and bouncing off from the edge of the outer box body. On the other hand, the straight edge of the box mouth of the inner box body presses against the inner straight edge of the double-folded edge of the box mouth of the outer box body outward. However, since the outer straight edge of the double-folded edge of the box mouth of the outer box body and the outer groove wall of the annular groove of the cover body or their extensions are pressed against each other and cooperate together, the double-folded edge of the box mouth of the outer box body and the annular groove of the cover body form an organic whole that restricts each other. In this way, the inner groove wall of the annular groove of the cover body is also driven to press outward, so that a good pressing and sealing state is always maintained between the adjacent two of the inner groove wall of the annular groove of the cover body, the straight edge of the box mouth of the inner box body, and the inner straight edge of the double-folded edge of the box mouth of the outer box body. When the heating of the container stops or the overall temperature of the container drops, the temperature of the outer box body drops the fastest, and the radial retraction speed of the inner straight edge of the double-folded edge of the box mouth of the outer box body is also the fastest. The radial retraction of the inner straight edge of the double-folded edge of the box mouth of the outer box body drives the straight edge of the box mouth of the inner box body and the inner groove wall of the annular groove of the cover body to also retract radially at the same time. During this process, the adjacent two always press tightly against each other and maintain a good sealing state. Finally, the multi-layered composite inner sealing structure can maintain good dynamic sealing performance under different heating states, overcoming the decrease in the sealing performance at the edge of the container caused by the expansion and deformation of the container due to hot steam. The container can preferably maintain the sealing performance at the edge (prevent leakage at the edge). The whole container of the present invention is a sealed container, which can effectively reduce heat loss during food heating or hot food distribution, and has a good heat preservation / heating effect. The combined sealed food container of the present invention can be widely used in hot food distribution, microwave heating or steam heating, and can also be used as a container and cooking utensil for picnic heating, sealed heat preservation, etc. 2. The support edge of the inner box body is mounted on the flat edge of the double-folded edge of the outer box body opening, that is, the support edge of the inner box body is above the outer box body and located outside the accommodation space of the outer box body. The user's fingers can easily grasp the support edge from above the outer box body (the user's fingers do not need to reach into the inner box body), so that the inner box body can be more easily taken out. The user's fingers will not contaminate the accommodation space of the outer box body. When the outer box body contains a heating agent, hot soup or hot drink, the user's fingers will not be scalded by the steam generated by the heating agent, hot soup or hot drink in the accommodation space of the outer box body. Moreover, the support edge of the inner box body will not be contaminated by the heating agent, hot soup or hot drink in the outer box body, and the user's fingers will not be contaminated by the support edge of the inner box body when taking out the inner box body.

[0022] Further, the outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body opening or their extensions are abutted against each other for sealing cooperation, adding an outer sealing structure between the cover body and the outer box body. Moreover, when the inner box body is taken out and the cover body is covered back on the outer box body, the sealed state of the outer box body can still be maintained.

[0023] Further, an annular gap is left between the circumferential side wall of the box body main body of the inner box body and the circumferential side wall of the box body main body of the outer box body. A sealing piece that is hermetically sealed with the opening of the inner box body is provided at the opening of the inner box body. A gap is left between the upper surface of the sealing piece and the cover plate of the cover body. A holding member is provided on the upper surface of the sealing piece. By adding a sealing piece at the opening of the inner box body, the inner box body becomes a relatively independent sealed container, preventing the hot steam from rising to the cover body, concentrating the heat inside the inner box body, effectively heating / keeping warm the food inside the inner box body, and also preventing the cover body from being deformed and arched due to heat. The provided holding member can achieve opening the sealing piece without contaminating the fingers. Moreover, the box body main body of the inner box body is in a suspended island state within the space surrounded by the cover body and the outer box body, with gaps all around. The air in this gap has a good heat preservation effect on the inner box body.

[0024] Further, the intersection of the flat edge and the outer straight edge of the double-folded edge of the outer box body opening is indented inward, leaving a gap below the outer end of the support edge, making it easier to grasp the support edge.

[0025] Further, the intersection of the flat edge and the outer straight edge of the double-folded edge of the outer box body opening is in an arc chamfer shape; or, the upper section of the outer straight edge of the double-folded edge of the outer box body opening is in an inclined plane shape. Leaving a larger gap below the outer end of the support edge makes it easier to grasp the support edge.

[0026] Further, the outer end of the support edge of the inner box body has an extension part extending downward along the outer straight edge of the double-folded edge of the outer box body opening, and a first locking mechanism is used for locking and cooperating between the extension part and the corresponding part of the outer straight edge of the double-folded edge of the outer box body opening. That is, the extension part is locked on the outer straight edge of the double-folded edge of the outer box body opening through the first locking mechanism. In this way, when the cover body is opened, the inner box body can still be stably locked with the outer box body, and the inner box body is not easily tilted or sunk.

[0027] Further, a second locking mechanism for locking the lower end part of the extension part is arranged on the outer groove wall of the annular groove of the cover body. By limiting and holding the lower end part of the extension part through the second locking mechanism, the anti-disengagement ability and anti-deformation ability of the whole container are further enhanced.

[0028] Further, a third locking mechanism is used for locking and cooperating between the outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body opening. The outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body opening are limited and held through the third locking mechanism, and the anti-disengagement ability and anti-deformation ability of the whole container are further enhanced.

[0029] Further, a fourth locking mechanism is arranged between the outer groove wall of the annular groove of the cover body and the outer straight edge of the double-folded edge of the outer box body opening. This fourth locking mechanism is located below the third locking mechanism and corresponds to the state where only the cover body and the outer box body are cooperated together. Since the support edge of the inner box body has a certain thickness, when the inner box body is taken out and the cover body needs to be re-covered on the outer box body, there is a certain gap at the mating part of the cover body and the outer box body. At this time, the cover body can be further pressed down, so that the locking cooperation between the cover body and the outer box body is replaced by the original third locking mechanism with the fourth locking mechanism, thereby realizing the locking cooperation between the cover body and the outer box body in the case of no inner box body.

[0030] Further, it further includes another inner box body with an open mouth. The another inner box body is sleeved inside the outer box body, and the inner box body is sleeved inside the another inner box body. There are corresponding spaces left between the bottom and the circumferential side wall of the another inner box body and the bottom and the circumferential side wall of the outer box body, forming an air isolation heat preservation layer surrounding the box body main body of the another inner box body. There is also a space left between the bottom of the inner box body and the bottom of the another inner box body, forming an accommodation space for holding a heating agent or hot soup or hot drink. At the opening of the another inner box body, there is a straight edge along the box mouth. The upper end of the straight edge along the box mouth of the another inner box body extends outward to form a support edge. A support step is arranged at or below the lower end of the inner straight edge of the outer box body. The support edge of the another inner box body is placed on the support step. When in use, food is placed in the inner box body, and a heating agent or hot soup or hot drink is placed in the another inner box body, which can heat or keep warm the food in the inner box body. The air isolation heat preservation layer surrounding the box body main body of the another inner box body can effectively reduce the heat loss of the whole container. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a vertical sectional view of the container in Embodiment 1 of the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 is a schematic view of the cooperation of the lid, the inner box body and the outer box body in Embodiment 2 of the present invention; Figure 4 is a schematic view of the structure of the inner box body and the outer box body in Embodiment 3 of the present invention; Figure 5 is a vertical sectional view of the container in Embodiment 3 of the present invention; Figure 6 is Figure 5 an enlarged view of part B in Figure 7 is a schematic view of the cooperation of the lid, the inner box body and the outer box body in Embodiment 4 of the present invention; Figure 8 is a schematic view of the cooperation of the lid, the inner box body and the outer box body in Embodiment 5 of the present invention; Figure 9 is a schematic view of the cooperation of the lid, the inner box body and the outer box body in Embodiment 6 of the present invention; Figure 10 is a schematic view of the cooperation of the lid and the outer box body in Embodiment 6 of the present invention; Figure 11 is a vertical sectional view of the container in Embodiment 7 of the present invention; Figure 12 is Figure 11 an enlarged view of part C in Figure 13Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 8 of the present invention; Figure 14 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 9 of the present invention; Figure 15 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 10 of the present invention; Figure 16 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 11 of the present invention; Figure 17 Vertical sectional view of the container in Embodiment 12 of the present invention; Figure 18 It is Figure 17 Enlarged view of part D in Figure 19 Vertical sectional view of the container in Embodiment 13 of the present invention; Figure 20 Vertical sectional view of the container in Embodiment 14 of the present invention; Figure 21 It is Figure 20 Enlarged view of part E in Figure 22 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 15 of the present invention; Figure 23 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 16 of the present invention; Figure 24 Schematic diagram of the cooperation among the cover body, the inner box body and the outer box body in Embodiment 17 of the present invention.

[0032] Wherein: 1 - cover body; 11 - inner groove wall; 12 - groove top; 13 - outer groove wall; 131 - bending part; 14 - first convex edge; 15 - fifth convex edge; 16 - cover plate; 17 - first protruding strip; 2 - outer box body; 21 - inner straight edge; 22 - flat edge; 23 - outer straight edge; 24 - second convex edge; 25 - gap; 26 - notch; 27 - U-shaped protective groove; 28 - third convex edge; 29 - sixth convex edge; 291 - seventh convex edge; 210 - box body main body; 211 - fourth protruding strip; 212 - support step; 3 - inner box body; 31 - box mouth straight edge; 32 - support edge; 321 - extension part; 33 - fourth convex edge; 34 - box body main body; 35 - second protruding strip; 36 - third protruding strip; 37 - support step; 38 - box mouth flat edge 4 - annular gap; 5 - sealing sheet; 51 - pull ring; 52 - sealing edge; 6 - gap; 7 - Another inner box body; 71 - Air isolation and heat preservation layer; 72 - Accommodating space; 73 - Straight edge of the box opening; 74 - Supporting edge; 75 - Step Detailed implementation mode In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. In the present invention, the direction towards the central axis of the container is defined as the inside, and the direction away from the central axis of the container is defined as the outside; the direction towards the opening of the container is defined as the top, and the direction away from the opening of the container is defined as the bottom.

[0033] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "provided with" and any variations thereof are intended to cover non-exclusive inclusion.

[0034] Embodiment 1: The combined airtight food container of the present invention, as shown in Embodiment 1 Figure 1-2 shown, includes a lid body 1, an open outer box body 2 and an open inner box body 3. The peripheral edge of the lid body 1 is provided with a downward-opening annular groove formed by an inner groove wall 11, a groove top 12 and an outer groove wall 13; the opening of the outer box body 2 is provided with a box mouth double edge formed by an inner straight edge 21, a flat edge 22 and an outer straight edge 23. The annular groove of the lid body 1 is nested and buckled on the box mouth double edge of the outer box body 2. After the two are nested and buckled, the inner groove wall 11, the groove top 12 and the outer groove wall 13 are respectively arranged corresponding to the inner straight edge 21, the flat edge 22 and the outer straight edge 23. Among them, the lower end of the outer straight edge 23 of the box mouth double edge of the outer box body 2 is inclined downward and outward to abut against the inner side surface of the outer groove wall 13 of the annular groove of the lid body 1, so that the annular groove of the lid body 1 and the box mouth double edge of the outer box body 2 abut and restrict each other in the inner and outer directions of the container, so that the annular groove of the lid body 1 and the box mouth double edge of the outer box body 2 form an organic whole that restricts each other.

[0035] The inner box body 3 is sleeved inside the outer box body 2, and there is a gap between the bottom of the inner box body 3 and the bottom of the outer box body 2, forming an accommodating space for holding a heating agent or hot soup or hot drink. This accommodating space can also be empty and used as an air isolation and heat preservation area at the bottom; further, the size of the box body main body 34 of the inner box body 3 can be designed to be slightly smaller than that of the outer box body 2, so that an annular gap 4 is left between the box body main body 34 of the inner box body 3 and the box body main body 210 of the outer box body 2, forming a circumferential air isolation and heat preservation area.

[0036] At the opening of the inner box body 3, there is a straight edge 31 of the box opening. The straight edge 31 of the box opening of the inner box body 3 is connected to the main body 34 of the box body of the inner box body 3 by a flat edge 38 of the box opening. The inner groove wall 11 of the annular groove of the cover body 1, the straight edge 31 of the box opening of the first inner box body 3, and the inner straight edge 21 of the double-edge of the box opening of the outer box body 2 are sequentially stacked from the inside to the outside, and the adjacent two are pressed against each other for sealing cooperation, forming a multiple-overlapped composite inner sealing structure. The upper end of the straight edge 31 of the box opening extends outward to form a support edge 32, and the support edge 32 is supported on the flat edge 22 of the double-edge of the box opening of the outer box body 2.

[0037] In this embodiment, since the inner groove wall 11 of the annular groove of the cover body 1 is in sealing cooperation with the straight edge 31 of the box opening of the first inner box body 3, and the straight edge 31 of the box opening of the first inner box body 3 is also in sealing cooperation with the inner straight edge 21 of the double-edge of the box opening of the outer box body 2, when the outer box body 2 is removed, the cover body 1 and the inner box body 3 can still form a sealed container when they are closed together.

[0038] As a specific example, in this embodiment, the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the inner box body 3 are pressed against each other and there is a small angle between them, and this angle can be approximately between 1 degree and 12 degrees; in this way, at the pressing place of the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the inner box body 3 (the intersection of the outer side surface of the inner groove wall 11 of the annular groove of the cover body 1 and the inner side surface of the straight edge 31 of the box opening of the inner box body 3), a sealing line is formed. This sealing line is the intersection line of two smooth curved surfaces. When the deformation degree of the container under pressure is relatively large, this sealing line also deforms together with the two smooth curved surfaces, but always remains in a closed-loop state, that is, the line seal will not be damaged and the sealing structure is relatively stable.

[0039] The straight edge 31 of the box opening of the inner box body 3 and the inner straight edge 23 of the double-edge of the box opening of the outer box body 2 are pressed against each other and there is a small angle between them, and this angle can be approximately between 1 degree and 12 degrees. At the pressing place of the inner straight edge 23 of the double-edge of the box opening of the outer box body 2 and the straight edge 31 of the box opening of the inner box body 3 (the intersection of the inner side surface of the inner straight edge 23 of the double-edge of the box opening of the outer box body 2 and the outer side surface of the straight edge 31 of the box opening of the inner box body 3), a sealing line is formed. This sealing line is the intersection line of two smooth curved surfaces. When the deformation degree of the container under pressure is relatively large, this sealing line also deforms together with the two smooth curved surfaces, but always remains in a closed-loop state, that is, the line seal will not be damaged and the sealing structure is relatively stable.

[0040] In this embodiment, the sealing structure between the inner groove wall 11 of the annular groove of the lid 1 and the straight edge 31 of the box opening of the inner box body 3, and the sealing structure between the straight edge 31 of the box opening of the inner box body 3 and the inner straight edge 23 of the double-folded edge of the box opening of the outer box body 2 can specifically refer to the sealing structure disclosed in Chinese invention patent ZL201010265807.X.

[0041] After adopting the above solution, for a combined airtight food container of the present invention, a straight edge 31 of the box opening is provided at the opening of the inner box body 3, and a support edge 32 extends outward from the upper end of the straight edge 31 of the box opening. This support edge 32 is erected on the flat edge 22 of the double-folded edge of the box opening of the outer box body 2. The inner groove wall 11 of the annular groove of the lid 1, the straight edge 31 of the box opening of the inner box body 3, and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2 are sequentially stacked from the inside to the outside, and the adjacent two are pressed against each other for sealing cooperation. Compared with the prior art, it has the following advantages: 1. The inner groove wall 11 of the annular groove of the cover body 1, the straight edge 31 of the box opening of the inner box body 3, and the inner straight edge 21 of the compound edge of the box opening of the outer box body 2 are sequentially stacked from the inside to the outside, and the adjacent two are pressed against each other for sealing fit, forming a multiple-layer superimposed composite inner sealing structure. Since the coefficient of thermal expansion of ultra-thin plastic is relatively high (several times higher than that of glass or metal materials), when heated, the container will expand significantly in the radial direction. When the outer box body 2 contains a heating agent or hot soup or hot drink, the heat steam generated by this heating agent or hot soup or hot drink will heat the inner box body 3. The temperature of the inner box body 3 in the whole container is the highest. In the multiple-layer superimposed composite inner sealing structure formed by the inner groove wall 11 of the annular groove of the cover body 1, the straight edge 31 of the box opening of the inner box body 3, and the inner straight edge 21 of the compound edge of the box opening of the outer box body 2, the radial expansion degree of the straight edge 31 of the box opening of the inner box body 3 is relatively large, while the radial expansion degrees of the inner groove wall 11 of the annular groove of the cover body 1 and the inner straight edge 21 of the compound edge of the box opening of the outer box body 2 are relatively small. The straight edge 31 of the box opening of the inner box body 3 presses against the inner straight edge 21 of the compound edge of the box opening of the outer box body 2 outward. However, since the outer straight edge 23 of the compound edge of the box opening of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 or their extensions are pressed against each other and cooperate together, the compound edge of the box opening of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other. In this way, the inner groove wall 11 of the annular groove of the cover body 1 is also driven to press outward, so that a good pressing and sealing state is always maintained between the adjacent two of the inner groove wall 11 of the annular groove of the cover body 1, the straight edge 31 of the box opening of the inner box body 3, and the inner straight edge 21 of the compound edge of the box opening of the outer box body 2. When the heating of the container stops or the overall temperature of the container drops, the temperature of the outer box body 2 drops the fastest, and the radial retraction speed of the inner straight edge 21 of the compound edge of the box opening of the outer box body 2 is also the fastest. The radial retraction of the inner straight edge 21 of the compound edge of the box opening of the outer box body 2 drives the straight edge 31 of the box opening of the inner box body 3 and the inner groove wall 11 of the annular groove of the cover body 1 to also retract radially at the same time. During this process, the adjacent two always press tightly together to maintain a good sealing state, and finally the multiple-layer superimposed composite inner sealing structure can maintain good dynamic sealing performance under different heating states, overcoming the decrease in the sealing performance at the mouth edge of the container caused by the upward arching deformation of the cover body 1 caused by heat steam. Therefore, the container does not need to be provided with exhaust holes like the prior art to maintain the sealing performance at the mouth edge (prevent leakage at the mouth edge). The whole container of the present invention is a sealed container, which can effectively reduce heat loss during food heating or hot food distribution, and has a good heat preservation / heating effect. The combined sealed food container of the present invention can be widely used in hot food distribution, microwave heating or steam heating, and can also be used as a container and cooking utensil for picnic heating, sealed heat preservation, etc. 2. The support edge 31 of the inner box body 3 is mounted on the flat edge 22 of the double-edge of the box opening of the outer box body 2. That is, the support edge 31 of the inner box body 3 is above the outer box body 2 and located outside the accommodation space of the outer box body 2. The user's fingers can easily grasp the support edge 31 from above the outer box body 2 (the user's fingers do not need to reach into the outer box body 2), so that the inner box body 3 can be easily taken out. The user's fingers will not contaminate the accommodation space of the outer box body 2. When the outer box body contains a heating agent, hot soup or hot drink, the user's fingers will not be scalded by the steam generated by the heating agent, hot soup or hot drink in the accommodation space of the outer box body 2. Moreover, the support edge 31 of the inner box body 3 will not be contaminated by the heating agent, hot soup or hot drink in the outer box body 2, and the user's fingers will not be contaminated by the support edge 31 of the inner box body 3 when taking out the inner box body 3.

[0042] Further, the lower end of the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 is inclined downward and outward to abut against the inner side surface of the outer groove wall 13 of the annular groove of the cover body 1. The two are in a line-sealing fit state at the abutting position, forming an outer sealing structure, adding a sealing structure between the cover body 1 and the outer box body 2, and improving the overall sealing performance of the container. Moreover, when taking out the inner box body 3, when the cover body 1 is covered back on the outer box body 2, the sealing state of the outer box body 2 can still be maintained.

[0043] Further, in this embodiment, in order to enhance the anti-deformation ability and anti-disengagement ability of the container, a third locking mechanism can be used for locking and matching between the outer groove wall 13 of the annular groove of the cover body 1 and the outer straight edge 23 of the double-edge of the box opening of the outer box body 2. In this embodiment, the third locking mechanism is a first convex edge 14 provided at the lower part of the inner side surface of the outer groove wall 13 of the annular groove of the cover body 1. The lower end of the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 abuts against the inner side surface of the outer groove wall 13 of the annular groove of the cover body 1 and abuts against the upper side of this first convex edge 14. In this way, the annular groove of the cover body 1 and the double-edge of the box opening of the outer box body 2 can be locked together in the up and down direction, preventing the cover body 1 from being disengaged and limiting its position, and increasing the anti-deformation ability of the whole container.

[0044] Further, in order to more easily grasp the support edge 32 of the inner box body 3 when taking out the inner box body 3, in this embodiment, the upper section of the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 can be improved, so that the intersection of the flat edge 22 of the double-edge of the box opening of the outer box body 2 and the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 is indented inward, leaving a gap below the outer end of the support edge 32. The user's fingertips or nails can reach into this gap to more easily grasp the support edge 32. Specifically, the intersection of the flat edge 22 of the double-edge of the box opening of the outer box body 2 and the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 can be designed as an arc chamfer shape, so as to leave a gap 25 below the outer end of the support edge 32.

[0045] Further, in this embodiment, the first convex edge 14 can be set as a discontinuous structure. In this way, a pressure relief port is formed between the discontinuous part of the first convex edge 14 and the outer groove wall of the annular groove of the cover body 1. When the steam pressure in the container exceeds the limit, after the steam breaks through the sealing structure at the edge of the container opening, it can be discharged out of the container through this pressure relief port, ensuring the safe use of the container.

[0046] Embodiment 2: The combined airtight food container of the present invention, Embodiment 2 is as Figure 3 shown. The difference between this embodiment and Embodiment 1 is only that: in this embodiment, the flat edge 22 of the double-edge of the box opening of the outer box body 2 is indented inward, and the upper section of the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 is beveled, leaving a larger gap 25 under the outer end of the support edge 32, making it easier to grasp the support edge 32.

[0047] Embodiment 3: The combined airtight food container of the present invention, Embodiment 3 is as Figure 4-6 shown. The difference between this embodiment and Embodiment 1 is only that: in this embodiment, one or more places of the flat edge 22 of the double-edge of the box opening of the outer box body 2 are recessed downward, forming one or more sunken notches 26 corresponding to the support edge 32 of the inner box body 3 on the double-edge of the box opening of the outer box body 2. The fingertips or nails of the user can reach into these notches 26 to more easily grasp the support edge 32, so that the inner box body 3 can be taken out easily.

[0048] In this embodiment, the container is a square container, and there are 4 notches 26, which are respectively arranged at the four corners of the square container.

[0049] Further, in this embodiment, the inner side surface of the outer groove wall 13 of the annular groove of the cover body 1 and the outer side surface of the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 are abutted against each other for sealing cooperation to form an outer sealing structure. Moreover, the lower end portion of the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 extends outward and upward in sequence, forming a U-shaped protection groove 27 with an upward opening on the outer side of the lower section of the outer groove wall 13 of the annular groove of the cover body 1. The lower section of the outer groove wall 13 of the annular groove of the cover body 1 extends into this U-shaped protection groove 27. A pull tab can be provided on a small section of this U-shaped protection groove 27. In the state where the cover body 1 is closed, the lower section of the outer groove wall 13 of the annular groove of the cover body 1 is completely hidden in the U-shaped protection groove 27, and it is very difficult to open the cover body 1 by hand. When the pull tab of the U-shaped protection groove 27 is torn off and a notch appears in the U-shaped protection groove 27, a part or all of the lower end portion of the outer groove wall 13 of the annular groove of the cover body 1 can be exposed, so that the lower end portion can be easily buckled to lift the cover body 1 upward. When the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 adopt this matching structure, the third locking mechanism adopts a second convex edge 24 provided on the inner side surface of the outer groove wall of the U-shaped protection groove 27. The lower end portion of the outer groove wall 13 of the annular groove of the cover body 1 extends outward and upward in sequence, and finally obliquely abuts against the inner side surface of the outer groove wall of the U-shaped protection groove 27 and abuts against the lower side of the second convex edge 24.

[0050] In this embodiment, the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are abutted against each other in the inner and outer directions and are fitted together. Their mutual abutting and fitting not only form an outer sealing structure, but also make the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other through their mutual abutting and fitting in the inner and outer directions. At the same time, the mutual restriction between the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 is further enhanced by the extension part of the lower end portion of the outer groove wall 13 of the annular groove of the cover body 1 abutting against the outer groove wall of the U-shaped protection groove 27.

[0051] In addition, the annular groove of the cover body 1 and the double-folded edge of the box mouth of the outer box body 2 are locked together in the up and down direction through the second convex edge 24, so as to prevent the cover body 1 from being detached and limit its position, and increase the anti-deformation ability of the whole container.

[0052] Embodiment 4: The combined airtight food container of the present invention, Embodiment 4 is as Figure 7As shown in the figure, the difference between this embodiment and the second embodiment is only that: in this embodiment, the lower end of the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 extends outwards and upwards in sequence, forming an upward-opening U-shaped protective groove 27 on the outer side of the lower section of the outer groove wall 13 of the annular groove of the cover body 1. The lower section of the outer groove wall 13 of the annular groove of the cover body 1 extends into this U-shaped protective groove 27. A pull tab can be provided on a small section of this U-shaped protective groove 27. When the cover body 1 is in the closed state, the lower section of the outer groove wall 13 of the annular groove of the cover body 1 is completely hidden in the U-shaped protective groove 27, and it is very difficult to open the cover body 1 by hand. When the pull tab of the U-shaped protective groove 27 is torn off and a notch appears in the U-shaped protective groove 27, a part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1 can be exposed, so that the lower end can be easily buckled to lift the cover body 1 upwards. The third locking mechanism adopts a second convex edge 24 provided on the inner side surface of the outer groove wall of the U-shaped protective groove 27. Correspondingly, the lower end of the outer groove wall 13 of the annular groove of the cover body 1 extends outwards and upwards in sequence, and finally obliquely abuts against the inner side surface of the outer groove wall of the U-shaped protective groove 27 and abuts against the lower side of the second convex edge 24.

[0053] In this embodiment, the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are held against each other in the inner and outer directions and cooperate with each other. Their mutual holding cooperation not only forms an outer sealing structure, but also makes the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other through their mutual holding cooperation in the inner and outer directions. At the same time, the mutual restriction between the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 is further enhanced by the extension part of the lower end of the outer groove wall 13 of the annular groove of the cover body 1 abutting against the outer groove wall of the U-shaped protective groove 27.

[0054] In addition, the annular groove of the cover body 1 and the double-folded edge of the box mouth of the outer box body 2 are locked together in the up and down direction through the second convex edge 24, the cover body 1 is limited against detachment, and the anti-deformation ability of the whole container is increased.

[0055] Embodiment Five: The combined airtight food container of the present invention, Embodiment Five is as Figure 8As shown, the difference between this embodiment and the first embodiment lies only in that: in this embodiment, the outer end of the support edge 32 of the inner box body 3 has an extension portion 321 extending downward along the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2, and a first locking mechanism is used for locking and cooperating between the extension portion 33 and the corresponding portion of the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2. In this embodiment, the first locking mechanism includes a third convex edge 28 provided on the outer side surface of the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2, and a fourth convex edge 33 provided on the extension portion 321 of the support edge 32 of the inner box body 3. The third convex edge 28 and the fourth convex edge 33 are engaged and locked together. Specifically, in the locked state, the fourth convex edge 33 abuts against the lower side of the third convex edge 28. In this way, when the cover body 1 is opened, the inner box body 3 can still be stably locked with the outer box body 2, and the inner box body 3 is not easily tilted and sunk.

[0056] Furthermore, in this embodiment, a sealing structure different from that of the first embodiment is adopted between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the first inner box body 3, and between the straight edge 31 of the box opening of the first inner box body 3 and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2. Specifically, in this embodiment, partial regions of at least one of the partial region of the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the inner box body 3 undergo elastic deformation, and the two deformations fit together to form an inner deformation self-locking region, thereby realizing the sealing cooperation between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the inner box body 3; partial regions of at least one of the partial region of the straight edge 31 of the box opening of the inner box body 3 and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2 undergo elastic deformation, and the two deformations fit together to form an outer deformation self-locking region, thereby realizing the sealing cooperation between the straight edge 31 of the box opening of the inner box body 3 and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2.

[0057] In this embodiment, the sealing structure adopted between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the first inner box body 3, and between the straight edge 31 of the box opening of the first inner box body 3 and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2 can refer to the sealing structure disclosed in Chinese Patent Application for Invention No. 202410178603.4.

[0058] Further, in this embodiment, a second latching mechanism for latching the lower end of the extension portion 321 may also be provided on the outer groove wall 13 of the annular groove of the lid 1. Specifically, the second latching mechanism uses a fifth convex edge 15 provided on the inner side surface of the outer groove wall 13 of the annular groove of the lid 1. In the latched state, the lower end of the extension portion 321 abuts against the upper side of the fifth convex edge 15, and the lower end of the extension portion 321 is latched by the fifth convex edge 15, thereby further enhancing the anti-unlatching ability and anti-deformation ability of the entire container.

[0059] Embodiment Six: The combined airtight food container of the present invention, Embodiment Six is as Figure 9-10 shown. The difference between this embodiment and Embodiment One is only that: the middle and lower part of the outer groove wall 13 of the annular groove of the lid 1 has a bent portion 131 that bends outward, and the top sealing portion between the outer groove wall 13 of the annular groove of the lid 1 and the outer straight edge 23 of the double-edge of the box mouth of the outer box body 2 corresponds to the upper inflection point of the bent portion 131. The third latching mechanism uses a cooperating structure of the first convex edge 14 and the sixth convex edge 29. The sixth convex edge 29 is provided on the outer side surface of the outer straight edge 23 of the double-edge of the box mouth of the outer box body 2. In the latched state, the first convex edge 14 meshes with the sixth convex edge 29 and the first convex edge 14 is located below the sixth convex edge 29. A fourth latching mechanism is also provided between the outer groove wall 13 of the annular groove of the lid 1 and the outer straight edge 23 of the double-edge of the box mouth of the outer box body 2. This fourth latching mechanism uses a cooperating structure of the first convex edge 14 and the seventh convex edge 291. The seventh convex edge 291 is provided below the sixth convex edge 29. In the latched state, the first convex edge 14 meshes with the seventh convex edge 291 and the first convex edge 14 is located below the seventh convex edge 291.

[0060] Since the support edge 32 of the inner box body 3 has a certain thickness, when the inner box body 3 is taken out and the lid 1 needs to be re-covered on the outer box body 2, there is a certain gap at the mating portion between the lid 1 and the outer box body 2. At this time, the lid 1 can be further pressed down, so that the latching fit between the lid 1 and the outer box body 2 is replaced by the original third latching mechanism with the fourth latching mechanism, that is, as Figure 10 shown, the first convex edge 14 is switched from meshing with the sixth convex edge 29 to meshing with the seventh convex edge 291, thereby realizing the latching fit between the lid 1 and the outer box body 2 in the case of no inner box body 3.

[0061] In this embodiment, by designing the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2 into a suitable bent structure, when the inner box body 3 is taken out, a top pressure sealing structure is also formed between the inner groove wall 11 of the annular groove of the lid 1 and the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2. When the inner box body 3 is taken out and the lid 1 is covered back on the outer box body 2, the lid 1 and the outer box body 2 can still form a conventional airtight container.

[0062] Further, in this embodiment, the lower end of the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2 extends outward and upward in sequence, and forms an upward-opening U-shaped protective groove 27 on the outer side of the lower section of the outer groove wall 13 of the annular groove of the cover body 1. The lower section of the outer groove wall 13 of the annular groove of the cover body 1 extends into this U-shaped protective groove 27. A pull tab may be provided on a small section of this U-shaped protective groove 27. When the cover body 1 is in the closed state, the lower section of the outer groove wall 13 of the annular groove of the cover body 1 is completely hidden in the U-shaped protective groove 27, and it is very difficult to open the cover body 1 by hand. When the pull tab of the U-shaped protective groove 27 is torn off and a notch appears in the U-shaped protective groove 27, part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1 can be exposed, so that the lower end can be easily buckled and the cover body 1 can be lifted upward.

[0063] Embodiment Seven: The combined airtight food container of the present invention, Embodiment Seven is as Figure 11-12 shown. The difference between this embodiment and Embodiment One is only that: in this embodiment, a sealing sheet 5 that is hermetically fitted with the opening of the inner box body 3 is covered at the opening of the inner box body 3. There is a gap 6 between the upper surface of the sealing sheet 5 and the cover plate 16 of the cover body 1. A gripping member is provided on the upper surface of the sealing sheet 5. This gripping member can adopt a pull ring 51. For the convenience of operation, the pull ring 51 can be provided in the middle of the upper surface of the sealing sheet 5 (inside the gap 6).

[0064] In this embodiment, the sealing structure between the sealing sheet 5 and the opening of the inner box body 3 can adopt various existing sealing structures, such as Figure 12 shown. The peripheral edge of the sealing sheet 5 has a sealing edge 52 that extends outward and upward. This sealing edge 52 and the straight edge 31 of the box opening of the inner box body 3 are pressed against each other to form a sealing structure.

[0065] In this embodiment, by adding the sealing sheet 5 at the opening of the inner box body 3, the inner box body 3 becomes a relatively independent airtight container, which can further protect the food in the inner box body 3 from being contaminated, and can also prevent the hot steam from rising to the cover body 1, concentrating the heat in the inner box body 3, and can effectively warm / keep warm the food in the inner box body 3. It can also effectively prevent the cover body 1 from being deformed and arched due to heat. The pull ring 51 provided therein can be used to easily open the sealing sheet 5 without contaminating the fingers. Moreover, the main body 34 of the box body of the inner box body 3 is in a suspended island state in the space surrounded by the cover body 1 and the outer box body 2, with gaps all around, forming an enclosed air isolation heat preservation layer, and the air therein has a good heat preservation effect on the inner box body 3.

[0066] Embodiment Eight: The combined airtight food container of the present invention, Embodiment Eight is as Figure 13As shown in the figure, the difference between this embodiment and the seventh embodiment is only that: in this embodiment, the lower end of the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2 extends outward and upward in sequence, and forms an upward-opening U-shaped protective groove 27 on the outer side of the lower section of the outer groove wall 13 of the annular groove of the cover body 1. The lower section of the outer groove wall 13 of the annular groove of the cover body 1 extends into this U-shaped protective groove 27. A pull tab can be provided on a small section of this U-shaped protective groove 27. When the cover body 1 is in the closed state, the lower section of the outer groove wall 13 of the annular groove of the cover body 1 is completely hidden in the U-shaped protective groove 27, and it is very difficult to open the cover body 1 by hand. When the pull tab of the U-shaped protective groove 27 is torn off and a notch appears in the U-shaped protective groove 27, a part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1 can be exposed, so that the lower end can be easily buckled to lift the cover body 1 upward. When the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 adopt this matching structure, the third locking mechanism adopts the second convex edge 24 provided on the inner side surface of the outer groove wall of the U-shaped protective groove 27. Correspondingly, the lower end of the outer groove wall 13 of the annular groove of the cover body 1 extends outward and upward in sequence, and finally obliquely abuts against the inner side surface of the outer groove wall of the U-shaped protective groove 27 and abuts against the lower side of the second convex edge 24.

[0067] In this embodiment, the outer straight edge 23 of the double-folded edge of the box opening of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are abutted and matched with each other in the inner and outer directions. Their mutual abutting and matching not only form an outer sealing structure, but also make the double-folded edge of the box opening of the outer box body 2 and the annular groove of the cover body 1 constitute an organic whole that restricts each other through their mutual abutting and matching in the inner and outer directions. At the same time, the mutual restriction between the double-folded edge of the box opening of the outer box body 2 and the annular groove of the cover body 1 is further enhanced by the extension of the lower end of the outer groove wall 13 of the annular groove of the cover body 1 abutting against the outer groove wall of the U-shaped protective groove 27.

[0068] In addition, the annular groove of the cover body 1 and the double-folded edge of the box opening of the outer box body 2 are locked together in the up and down direction through the second convex edge 24, the cover body 1 is prevented from being disengaged and limited, and the anti-deformation ability of the whole container is increased.

[0069] Furthermore, in this embodiment, one or more places of the flat edge 22 of the double-folded edge of the box opening of the outer box body 2 are recessed downward, and one or more sunken notches 26 corresponding to the support edge 32 of the inner box body 3 are formed on the double-folded edge of the box opening of the outer box body 2. The fingertips or nails of the user can extend into the notches 26 to more easily grasp the support edge 32, so that the inner box body 3 can be easily taken out.

[0070] In the above embodiments of the present invention, through reasonable design, the sealing line or sealing area between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box mouth of the first inner box body 3, and the sealing line or sealing area between the straight edge 31 of the box mouth of the first inner box body 3 and the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2 are respectively located above and below the notch 26. In this way, the notch 26 can be provided in each of the above embodiments without affecting the airtight performance of the entire container.

[0071] Embodiment Nine: The combined airtight food container of the present invention, Embodiment Nine is as Figure 14 shown. The difference between this embodiment and Embodiment One is only that: in this embodiment, other sealing structures are adopted between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box mouth of the inner box body 3, and between the straight edge 31 of the box mouth of the inner box body 3 and the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2 to achieve sealing fit. Specifically: a first rib 17 is provided on the outer side surface of the inner groove wall 11 of the annular groove of the cover body 1, a second rib 35 is provided on the inner side surface of the straight edge 31 of the box mouth of the inner box body 3, a third rib 36 is provided on the outer side surface of the straight edge 31 of the box mouth of the inner box body 3, and a fourth rib 211 is provided on the inner side surface of the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2. The inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box mouth of the inner box body 3 are sealed by mutual pressing through the meshing and locking of the first rib 17 and the second rib 35; the straight edge 31 of the box mouth of the first inner box body 3 and the inner straight edge 21 of the double-edge of the box mouth of the outer box body 2 are sealed by mutual pressing through the meshing and locking of the fourth rib 211 and the third rib 36.

[0072] Embodiment Ten: The combined airtight food container of the present invention, Embodiment Ten is as Figure 15 shown. The difference between this embodiment and Embodiment One is only that: in this embodiment, other sealing structures are adopted between the inner groove wall 11 of the annular groove of the cover body and the straight edge 31 of the box mouth of the inner box body, and between the straight edge 31 of the box mouth of the inner box body and the inner straight edge 21 of the double-edge of the box mouth of the outer box body to achieve sealing fit. Specifically: a first rib 17 is provided on the outer side surface of the inner groove wall 11 of the annular groove of the cover body 1, and a third rib 36 is provided on the outer side surface of the straight edge 31 of the box mouth of the inner box body. The inner groove wall 11 of the annular groove of the cover body and the straight edge 31 of the box mouth of the inner box body are sealed by mutual pressing between the first rib 17 and the straight edge 31 of the inner box body; the straight edge 31 of the box mouth of the inner box body and the inner straight edge 21 of the double-edge of the box mouth of the outer box body are sealed by mutual pressing between the third rib 36 and the inner straight edge 21 of the double-edge of the box mouth of the outer box body.

[0073] Embodiment Eleven: The combined airtight food container of the present invention, in the eleventh embodiment, as Figure 16 shown. The difference between this embodiment and the first embodiment is only that: in this embodiment, between the inner groove wall 11 of the annular groove of the lid body 1 and the straight edge 31 of the box opening of the inner box body 3, and between the straight edge 31 of the box opening of the first inner box 3 body and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2, other sealing structures are adopted to achieve sealing fit. Specifically: a second protrusion 35 is provided on the inner side surface of the straight edge 31 of the box opening of the inner box body, and a fourth protrusion 211 is provided on the inner side surface of the inner straight edge 21 of the double-folded edge of the box opening of the outer box body. The sealing between the inner groove wall 11 of the annular groove of the lid body and the straight edge 31 of the box opening of the inner box body is achieved by the mutual pressing between the second protrusion 35 and the inner groove wall 11 of the annular groove of the lid body 1; the sealing between the straight edge 31 of the box opening of the inner box body and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body is achieved by the mutual pressing between the fourth protrusion 211 and the straight edge 31 of the box opening of the inner box body.

[0074] Embodiment Twelve: The combined airtight food container of the present invention, in the twelfth embodiment, as Figure 17 and Figure 18 shown. In this embodiment, between the inner groove wall 11 of the annular groove of the lid body 1 and the straight edge 31 of the box opening of the inner box body 3, and between the straight edge 31 of the box opening of the first inner box 3 body and the inner straight edge 21 of the double-folded edge of the box opening of the outer box body 2, the sealing structures in the above embodiments or their deformations and combinations can be adopted to achieve sealing fit.

[0075] The difference between this embodiment and the above-mentioned embodiments lies only in that: another inner box body 7 with an opening is added. The another inner box body 7 is sleeved inside the outer box body 2, the inner box body 3 is sleeved inside the another inner box body 7, and a step 75 is arranged at the position corresponding to the lower part of the inner box body 3 inside the another inner box body 7 for supporting the inner box body 3 in case of emergencies. There are corresponding gaps between the bottom and the circumferential side wall of the another inner box body 7 and the bottom and the circumferential side wall of the outer box body 2, forming an air isolation heat preservation layer 71 surrounding the body of the another inner box body 7. There is also a gap between the bottom of the inner box body 3 and the bottom of the another inner box body 7, forming a containing space 72 for containing heating agent or hot soup or hot drink; at the opening of the another inner box body 7, there is a straight edge 73 of the box mouth, and the upper end of the straight edge 73 of the box mouth of the another inner box body 7 extends outwards to form a supporting edge 74. A supporting step 212 is arranged at the lower end or below the inner straight edge 21 of the outer box body 2, and the supporting edge 74 of the another inner box body 7 is placed on the supporting step 212. When in use, food is placed in the inner box body 3, and a heating agent or hot soup or hot drink is placed in the another inner box body 7 (the heating agent can adopt a self-heating pack, water is placed in the another inner box body 7, and the self-heating pack is soaked in water), so as to heat or keep warm the food in the inner box body 3. The air isolation heat preservation layer 71 surrounding the body of the another inner box body 7 can effectively reduce the heat loss of the whole container.

[0076] Embodiment Thirteen: The combined airtight food container of the present invention, Embodiment Thirteen is as Figure 19 shown. The difference between this embodiment and Embodiment Twelve lies only in that: a sealing piece 5 is hermetically covered at the opening of the inner box body 3, so that the inner box body 3 becomes a relatively independent airtight container, preventing the hot steam from rising to the cover body 1, concentrating the heat inside the inner box body 3, effectively heating / keeping warm the food in the inner box body 3, and effectively preventing the cover body 1 from being deformed and arched due to heat. The pull ring 51 arranged therein can realize easily opening the sealing piece 5 without polluting the fingers. Moreover, the main body 34 of the box body of the inner box body 3 is in a suspended island state within the space surrounded by the cover body 1 and the another inner box body 7, with gaps all around, forming a surrounding air isolation heat preservation layer, and the air therein has a good heat preservation effect on the inner box body 3. In this embodiment, the setting method of the sealing piece 5 can refer to Embodiment Seven above.

[0077] Embodiment Fourteen: The combined airtight food container of the present invention, Embodiment Fourteen is as Figure 20 and Figure 21As shown in the figure, the difference between this embodiment and the twelfth embodiment is only that: the inner box body 3 is sleeved inside the outer box body 2, the other inner box body 7 is sleeved inside the inner box body 3, and a step 38 is provided at the position corresponding to the lower part of the other inner box body 7 inside the inner box body 3 for supporting the other inner box body 7 in case of an emergency. A gap is left between the bottom and the circumferential side wall of the inner box body 3 and the bottom and the circumferential side wall of the outer box body 2 respectively to form an air isolation heat preservation layer surrounding the box body main body of the inner box body 3. A gap is also left between the bottom of the other inner box body 7 and the bottom of the inner box body 3 to form an accommodating space for containing heating agents or hot soup or hot drinks; a supporting step 37 is provided at the lower end or below the straight edge 31 of the box mouth of the inner box body 3, and the supporting edge 74 of the other inner box body 7 is erected on the supporting step 37 of the inner box body.

[0078] Embodiment Fifteen: The combined airtight food container of the present invention, Embodiment Fifteen is as Figure 22 As shown in the figure, the difference between this embodiment and the third embodiment is only that: the outer groove wall 13 of the annular groove of the cover body 1 is not provided with an extension part, and the lower end part of the outer groove wall 13 of the annular groove of the cover body 1 extends into the U-shaped protective groove 27 formed by extending the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2.

[0079] In this embodiment, the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are in mutual abutting cooperation in the inner and outer directions. Their mutual abutting cooperation not only forms an outer sealing structure, but also makes the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other through their mutual abutting cooperation in the inner and outer directions.

[0080] Embodiment Sixteen: The combined airtight food container of the present invention, Embodiment Sixteen is as Figure 23 As shown in the figure, the difference between this embodiment and the fifteenth embodiment is only that: the lower end part of the outer groove wall 13 of the annular groove of the cover body 1 is provided with an outward extension part, and there is a certain distance between this extension part and the bottom of the U-shaped protective groove 27. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a notch appears in the U-shaped protective groove 27, and through this notch, the extension part at the lower end part of the outer groove wall 13 of the annular groove of the cover body 1 can be held, so that the cover body 1 can be opened more easily.

[0081] In this embodiment, the outer straight edge 23 of the double-folded edge of the box mouth of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are in mutual abutting cooperation in the inner and outer directions. Their mutual abutting cooperation not only forms an outer sealing structure, but also makes the double-folded edge of the box mouth of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other through their mutual abutting cooperation in the inner and outer directions.

[0082] Embodiment Seventeen: For the combined airtight food container of the present invention, in the seventeenth embodiment, as Figure 24 shown, the difference between this embodiment and the sixteenth embodiment is only that: the extension part extending outward at the lower end of the outer groove wall 13 of the annular groove of the cover body 1 is lengthened, and finally abuts against the inner side surface of the outer groove wall of the U-shaped protective groove 27 and abuts against the lower side of the second convex edge 24. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a notch appears in the U-shaped protective groove 27. Similarly, the extension part at the lower end of the outer groove wall 13 of the annular groove of the cover body 1 can be held through this notch, so that the cover body 1 can be opened more easily.

[0083] In this embodiment, the outer straight edge 23 of the double-edge of the box opening of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually abutted and matched in the inner and outer directions. Their mutual abutting and matching not only form an outer sealing structure, but also make the double-edge of the box opening of the outer box body 2 and the annular groove of the cover body 1 form an organic whole that restricts each other through their mutual abutting and matching in the inner and outer directions. At the same time, the mutual restriction between the double-edge of the box opening of the outer box body 2 and the annular groove of the cover body 1 is further enhanced by the extension part at the lower end of the outer groove wall 13 of the annular groove of the cover body 1 abutting against the outer groove wall of the U-shaped protective groove 27.

[0084] In addition, the annular groove of the cover body 1 and the double-edge of the box opening of the outer box body 2 are also locked together in the up and down direction through the second convex edge 24, so as to prevent the cover body 1 from being disengaged and limit its position, and increase the anti-deformation ability of the whole container.

[0085] In the present invention, between the inner groove wall 11 of the annular groove of the cover body 1 and the straight edge 31 of the box opening of the first inner box 3 body, between the straight edge 31 of the box opening of the first inner box 3 body and the inner straight edge 21 of the double-edge of the box opening of the outer box body 2, and between the outer groove wall 13 of the annular groove of the cover body 1 and the outer straight edge 23 of the double-edge of the box opening of the outer box body 2, the sealing structures can all adopt various existing sealing structures that can realize the mutual pressing and sealing between the two.

[0086] In the above-mentioned various embodiments of the present invention, a sealing sheet 5 can be provided.

[0087] In the above-mentioned various embodiments of the present invention, extension parts 321 can be provided at the outer ends of the supporting edges 32 of the inner box body 3, and locking cooperation is carried out through the first locking mechanism.

[0088] In the above embodiments of the present invention, each convex edge in the third locking mechanism can be set as a discontinuous structure. For the embodiments provided with the fourth locking mechanism, the seventh convex edge 291 of the fourth locking mechanism can also be set as a discontinuous structure, so that a pressure discharge port is formed between the discontinuous parts of these convex edges and the corresponding outer groove wall or outer straight edge. When the steam pressure in the container exceeds the limit, the steam can break through the sealing structure at the edge of the container opening and then be discharged out of the container through this pressure discharge port, ensuring the safe use of the container.

[0089] In the present invention, the inner box body 3 can adopt a multi-grid structure. Correspondingly, the lower surface of the cover plate 16 of the cover body 1 is provided with sealing strips corresponding to the edges of each grid. After the cover body 1 is closed, each grid is an independent sealed cavity, which can effectively prevent the food in each grid from mixing or adulterating with each other.

[0090] In the present invention, in each of the embodiments provided with the sealing sheet 5, a through ventilation hole (not shown in the figure) can also be opened along the thickness direction on the flat edge 38 of the box opening of the inner box body 3. The hot steam generated in the outer box body 2 can enter the interior of the inner box body 3 through this ventilation hole and directly contact the food in the inner box body 3, enhancing the heating and heat preservation effects on the food in the inner box body. Due to the existence of the sealing sheet 5, the hot steam generated in the outer box body 2 can be prevented from directly reaching the cover body 1, thereby avoiding various problems caused by the direct passage of hot steam to the cover body 1.

[0091] The combined airtight food container of the present invention can be widely used in hot food delivery, microwave heating or steam heating, and can also be used as a container and cooking utensil for picnic heating, airtight heat preservation, etc. The embodiments described in the present invention are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments shown, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A combined sealed food container, comprising a cover, an open outer box body and an open inner box body; The peripheral edge of the cover body is provided with an annular groove which is open downward and is composed of an inner groove wall, a groove top and an outer groove wall; The opening of the outer box body is provided with a box mouth composite edge consisting of an inner straight edge, a flat edge and an outer straight edge; The annular groove of the cover body is nested and buckled on the edge of the box opening of the outer box body; The outer straight edge of the box mouth compound edge is supported and matched with the outer groove wall of the annular groove, or the extended portion of the outer straight edge of the box mouth compound edge is supported and matched with the extended portion of the outer groove wall of the annular groove; The inner box body is sleeved in the outer box body, and a gap is left between the bottom of the inner box body and the bottom of the outer box body; the characteristics are: A straight edge of the box mouth is provided at the opening of the inner box body, and the inner groove wall of the annular groove of the cover body, the straight edge of the box mouth of the inner box body and the inner straight edge of the box mouth of the outer box body are stacked in sequence from the inside to the outside, and the adjacent two are pressed against each other for sealing cooperation to form an inner sealing structure; the upper end of the straight edge of the box mouth of the inner box body extends outward to form a supporting edge, and the supporting edge is mounted on the flat edge of the box mouth of the outer box body.

2. The combined sealed food container according to claim 1, characterized in that: The inner groove wall of the annular groove of the cover body and the straight edge of the box opening of the inner box body are pressed against each other, and an angle of 1-12 degrees is formed between the two. The straight edge of the box opening of the inner box body and the inner straight edge of the box opening of the outer box body are pressed against each other, and an angle of 1-12 degrees is formed between the two. Alternatively, a part of the inner groove wall of the annular groove of the cover body or / and a part of the straight edge of the box opening of the inner box body are elastically deformed and the two are deformed and fitted together to form an inner deformation self-locking area, and a part of the straight edge of the box opening of the inner box body or / and a part of the inner straight edge of the box opening of the outer box body are elastically deformed and the two are deformed and fitted together to form an outer deformation self-locking area; Alternatively, the inner groove wall of the annular groove of the cover body, the straight edge of the box opening of the inner box body and the inner straight edge of the double edge of the box opening of the outer box body are sealed and matched with each other through protruding strips.

3. The combined sealed food container according to claim 1 or 2, characterized in that: The outer groove wall of the annular groove of the cover body and the outer straight edge of the box opening of the outer box body are mutually supported and sealed to form an external sealing structure; or, the extended part of the outer groove wall of the annular groove of the cover body and the extended part of the outer straight edge of the box opening of the outer box body are mutually supported and sealed to form an external sealing structure.

4. The combined sealed food container according to claim 1, characterized in that: An annular gap is left between the circumferential side wall of the box body main body of the inner box body and the circumferential side wall of the box body main body of the outer box body, the opening of the inner box body is covered with a sealing sheet that seals with the opening of the inner box body, a gap is left between the upper surface of the sealing sheet and the cover plate of the cover body, and a gripping component is provided on the upper surface of the sealing sheet.

5. The combined sealed food container according to claim 1, characterized in that: The intersection of the flat edge of the box opening compound edge of the outer box body and the outer straight edge of the box opening compound edge of the outer box body is retracted inwardly, leaving a gap below the outer end of the supporting edge.

6. The combined sealed food container according to claim 5, characterized in that: The intersection of the flat edge of the outer box body's box opening and the outer straight edge of the outer box body's box opening is in an arc chamfered shape; or, the upper section of the outer straight edge of the outer box body's box opening is in an inclined surface shape.

7. The combined sealed food container according to claim 1, characterized in that: The outer end of the supporting edge of the inner box body has an extension portion extending downward along the outer straight edge of the box mouth of the outer box body, and the extension portion is locked with the corresponding part of the outer straight edge of the box mouth of the outer box body through a first locking mechanism.

8. The combined sealed food container according to claim 7, characterized in that: A second locking mechanism for locking the lower end of the extension portion is arranged on the outer groove wall of the annular groove of the cover body.

9. The combined sealed food container according to claim 1, characterized in that: The outer groove wall of the annular groove of the cover body and the outer straight edge of the box opening edge of the outer box body are locked and matched through a third locking mechanism.

10. The combined sealed food container according to claim 9, characterized in that: A fourth locking mechanism is provided between the outer groove wall of the annular groove of the cover body and the outer straight edge of the box opening of the outer box body. The fourth locking mechanism is located below the third locking mechanism and corresponds to a state where only the cover body and the outer box body are matched together.

11. The combined sealed food container according to claim 1, characterized in that: It also includes another open inner box body, which is sleeved in the outer box body, and the inner box body is sleeved in the other inner box body. There are corresponding gaps between the bottom and circumferential side walls of the other inner box body and the bottom and circumferential side walls of the outer box body, forming an air-insulating and heat-insulating layer surrounding the box body of the other inner box body. There is also a gap between the bottom of the inner box body and the bottom of the other inner box body, forming a storage space for holding a heating agent, hot soup or hot drink; a straight edge of the box mouth is provided at the opening of the other inner box body, and the upper end of the straight edge of the box mouth of the other inner box body extends outward to form a supporting edge, and a supporting step is provided at the lower end or below the inner straight edge of the outer box body, and the supporting edge of the other inner box body is mounted on the supporting step.

12. The combined sealed food container according to claim 11, characterized in that: The inner box body is sleeved in the outer box body, and the other inner box body is sleeved in the inner box body. A gap is left between the bottom and circumferential side wall of the inner box body and the bottom and circumferential side wall of the outer box body to form an air-insulating and heat-insulating layer surrounding the box body of the inner box body. A gap is also left between the bottom of the other inner box body and the bottom of the inner box body to form a storage space for holding a heating agent, hot soup or hot drink. A supporting step is arranged at or below the lower end of the straight edge of the box opening of the inner box body, and the supporting edge of the other inner box body is mounted on the supporting step of the inner box body.

13. The combined sealed food container according to claim 4, characterized in that: The straight edge of the box opening of the inner box body is connected to the box body of the inner box body by a flat edge of the box opening, and a through vent hole is arranged on the flat edge of the box opening along the thickness direction thereof.

Images