A combination closure for a food container

Abstract

The utility model discloses a kind of combined closed food containers, including lid, open outer box body and open inner box body, the periphery of lid is equipped with the annular groove of downward opening by inner groove wall, groove top and outer groove wall;The opening of outer box body is equipped with the box mouth complex along by inner straight along, flat along, outer straight along, annular groove is buckled on box mouth complex along;Inner box body is sleeved in outer box body and the spacing between the bottom of both;The opening of inner box body is equipped with box mouth straight along, the inner groove wall of the annular groove of lid, the inner straight along of box mouth straight along of inner box body and the inner straight along of box mouth complex along of outer box body are sequentially stacked from inside to outside and mutually top pressure between two adjacent ones are sealed cooperation;The upper end of box mouth straight along extends outward with support along, support along is erected on the flat along of box mouth complex along of outer box body.The whole container of the utility model is closed, and the sealing structure performance of mouth along place is superior, can effectively reduce heat loss when food heating or hot food distribution.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology in ultra-thin injection molding, specifically a combined airtight food container made of ultra-thin plastic. Background Technology

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

[0003] The coefficient of thermal expansion of plastic materials (100-200x10-6) is greater than that of commonly used metal materials (10-20x10-6) and glass materials (0.5-15x10-6). Existing ultra-thin plastic containers are constrained by the coefficient of thermal expansion of plastic materials and the easy deformation caused by ultra-thin molding processes. Their sealing structures at the rim generally adopt traditional top-holding line seals or adhesive surface seals. Both of these sealing structures are difficult to avoid the inherent poor fit of the materials. When the container expands and deforms due to heat, it is easy to cause the container seal to fail and leak.

[0004] In addition, to overcome the shortcomings of traditional ultra-thin containers that only have a single storage space, Chinese utility model patent CN202542112 U discloses a novel fully sealed ultra-thin food container, which adopts a double-box structure. Specifically, it includes a matching lid, an open outer box, and an open inner box. The lid has a downward-opening annular groove formed by an inner groove wall, a groove top, and an outer groove wall. The outer box has a box mouth rim formed by an inner straight edge, a flat edge, and an outer straight edge. The groove fits onto the box mouth rim rim. The inner groove wall of the groove fits against the inner straight edge of the box mouth rim, and a locking buckle is provided at the fitting point to form an inner sealing structure. The outer straight edge of the box mouth rim extends downward and outward at an angle, and its lower end abuts against the inner side of the outer groove wall of the groove to form an outer sealing structure. The inner box is fitted inside the outer box and is shorter than the outer box. An annular support step is located at the lower end of the inner straight edge of the outer box. A support edge is provided at the opening of the inner box to support the inner box on this annular support step. The opening of the inner box has a recess that faces inwards. A small hole is provided on the lid to allow moisture to escape. Moisture inside the outer box rises through the recess in the inner box and then escapes through this small hole, preventing the lid from warping due to moisture and thus maintaining a proper seal between the outer box and the lid.

[0005] The aforementioned novel fully sealed ultra-thin food container has its inner box supported by a ring-shaped support step located at the lower end of the inner straight edge of the outer box. It is intended for use in food heating or hot food delivery, but it has the following problems:

[0006] 1. The sealing performance at the container rim is achieved solely through the sealing fit between the outer box and the lid; the inner box does not participate in the sealing fit. Due to the high coefficient of thermal expansion of ultra-thin plastic (several times higher than glass or metal), the container expands significantly radially when heated. When the outer box contains a heating agent, hot soup, or hot beverage, the steam generated by this agent or beverage heats the inner box. The steam from the outer box rises from the recess of the inner box to the lid, and the steam generated by the inner box also rises to the lid. The lid's temperature is much higher than the outer box's temperature. In the inner sealing structure formed by the inner groove wall of the lid and the inner straight edge of the outer box's rim, the radial expansion of the lid's annular groove is much greater than that of the outer box's rim. This leads to deviations in the fit precision of the locking points and the top holding points of the inner sealing structure between the outer box and the lid, resulting in unstable sealing performance at the container rim and potential leakage. Furthermore, because the lid is relatively light, excessive radial expansion of the lid can easily cause it to pop open from the edge of the outer box.

[0007] 2. In order to solve the problem that the lid of the box is easy to pop open due to excessive expansion, a small hole is made on the lid to allow water vapor to escape. However, this means that the entire container is not a sealed container. The heat energy inside the container is constantly dissipated to the outside of the container through this small hole, resulting in a large heat loss and poor heat preservation / heating effect. Utility Model Content

[0008] The purpose of this invention is to provide a combined sealed food container with better sealing performance at the sealing fit structure at the rim, and the entire container is in a sealed state, which can effectively reduce heat loss when heating food or delivering hot food, and has a better heat preservation / heating effect.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A combined sealed food container includes a lid, an open outer box, and an open inner box. The lid has a downward-opening annular groove along its periphery, formed by an inner groove wall, a groove top, and an outer groove wall. The outer box has a rim formed by an inner straight edge, a flat edge, and an outer straight edge at its opening. The annular groove of the lid nests and engages with the rim of the outer box. The outer straight edge of the rim engages with the outer groove wall of the annular groove, or the extension of the outer straight edge of the rim engages with the extension of the outer groove wall of the annular groove. Together; the inner box is fitted inside the outer box, with a gap between the bottom of the inner box and the bottom of the outer box; the opening of the inner box has a straight edge, and the inner wall of the annular groove of the cover, the straight edge of the inner box, and the inner straight edge of the outer box's double edge are stacked sequentially from the inside to the outside, with adjacent ones pressing against each other to form an inner sealing structure; the upper end of the straight edge of the inner box extends outward to form a support edge, which is supported on the flat edge of the outer box's double edge.

[0011] Furthermore, the inner wall of the annular groove of the cover presses against the straight edge of the inner box opening, with an angle of 1-12 degrees between them; the straight edge of the inner box opening presses against the inner straight edge of the outer box opening, with an angle of 1-12 degrees between them; or, a portion of the inner wall of the annular groove of the cover and / or a portion of the straight edge of the inner box opening elastically deforms and the two deform together to form an inner deformation self-locking area; a portion of the straight edge of the inner box opening and / or a portion of the inner straight edge of the outer box opening elastically deforms and the two deform together to form an outer deformation self-locking area; or, adjacent pairs of the inner wall of the annular groove of the cover, the straight edge of the inner box opening, and the inner straight edge of the outer box opening are sealed together by protrusions.

[0012] Furthermore, the outer groove wall of the annular groove of the cover and the outer straight edge of the outer box opening are mutually abutted to form a sealing fit, thereby forming an external sealing structure; or, the extension of the outer groove wall of the annular groove of the cover and the extension of the outer straight edge of the outer box opening are mutually abutted to form a sealing fit, thereby forming an external sealing structure.

[0013] Furthermore, an annular gap is left between the circumferential sidewall of the inner box body and the circumferential sidewall of the outer box body. A sealing sheet is provided at the opening of the inner box body to seal and cooperate 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. A gripping component is provided on the upper surface of the sealing sheet.

[0014] Furthermore, the intersection of the flat edge of the outer box opening and the outer straight edge of the outer box opening is recessed inward, leaving a gap below the outer end of the support edge.

[0015] Furthermore, the intersection of the flat edge of the outer box opening and the outer straight edge of the outer box opening is an arc-shaped chamfer; or, the upper section of the outer straight edge of the outer box opening is a bevel.

[0016] Furthermore, the outer end of the support edge of the inner box has an extension that extends downward along the outer straight edge of the outer box opening, and the extension and the corresponding part of the outer straight edge of the outer box opening are locked together by a first locking mechanism.

[0017] Furthermore, a second locking mechanism for locking the lower end of the extension is provided on the outer wall of the annular groove of the cover.

[0018] Furthermore, the outer groove wall of the annular groove of the cover and the outer straight edge of the box opening of the outer box are locked together by a third locking mechanism.

[0019] Furthermore, a fourth locking mechanism is provided between the outer wall of the annular groove of the cover and the outer straight edge of the outer box opening. This fourth locking mechanism is located below the third locking mechanism and corresponds to the state in which only the cover and the outer box are engaged together.

[0020] Furthermore, it also includes another open inner box, which is fitted inside the outer box. The bottom and circumferential sidewalls of the other inner box are respectively spaced from the bottom and circumferential sidewalls of the outer box, forming an air-insulated layer surrounding the main body of the other inner box. There is also a gap between the bottom of the inner box and the bottom of the other inner box, forming a space for holding a heating agent, hot soup, or hot beverage. The opening of the other inner box has a straight edge, and the upper end of the straight edge of the other inner box extends outward to form a support edge. A support step is provided at the lower end or below the inner straight edge of the outer box, and the support edge of the other inner box is supported on the support step.

[0021] Furthermore, the inner box is fitted inside the outer box, and the other inner box is fitted inside the inner box. A gap is left between the bottom and circumferential sidewalls of the inner box and the bottom and circumferential sidewalls of the outer box, forming an air-insulated layer surrounding the main body of the inner box. A gap is also left between the bottom of the other inner box and the bottom of the inner box, forming a space for holding a heating agent, hot soup, or hot beverage. A supporting step is provided at or below the lower end of the straight edge of the inner box opening, and the supporting edge of the other inner box is mounted on the supporting step of the inner box.

[0022] Furthermore, the straight edge of the inner box opening is connected to the main body of the inner box by a flat edge of the opening, and a through-hole is formed on the flat edge of the opening along its thickness direction.

[0023] With the above solution, the present invention provides a combined sealed food container, wherein the opening of the inner box is provided with a straight edge, the upper end of which extends outward to form a support edge. This support edge is mounted on the flat edge of the outer box's double edge. The inner wall of the annular groove of the lid, the straight edge of the inner box, and the inner straight edge of the outer box's double edge are stacked sequentially from the inside out, and adjacent pieces press against each other for a sealing fit. Compared with the prior art, this invention has the following advantages:

[0024] 1. The inner wall of the annular groove of the lid, the straight edge of the inner box opening, and the inner straight edge of the outer box opening are stacked sequentially from the inside out, with adjacent pieces pressing against each other for a sealing fit, forming a multi-layered composite inner sealing structure. Because ultra-thin plastic has a relatively high coefficient of thermal expansion (several times higher than glass or metal), the container will expand significantly in the radial direction when heated. When the outer casing contains a heating agent, hot soup, or hot beverage, the steam generated by this agent, soup, or beverage is blocked by the inner casing, concentrating its heating on the bottom and body of the inner casing and preventing it from rising to the lid. This results in the inner casing having the highest temperature within the entire container. In the multi-overlapping composite inner sealing structure formed by the inner wall of the annular groove of the lid, the straight edge of the inner casing's opening, and the inner straight edge of the outer casing's compound opening, the radial expansion of the straight edge of the inner casing's opening is greater, while the radial expansion of the inner wall of the annular groove of the lid and the inner straight edge of the outer casing's compound opening is smaller. This eliminates the need for ventilation holes on the lid, as is common in existing technologies. The vents prevent the lid from expanding too much radially and popping open from the edge of the outer box. On the other hand, the straight edge of the inner box presses outward against the inner straight edge of the outer box's rim. However, because the outer straight edge of the outer box's rim and the outer wall of the annular groove of the lid, or their extensions, are mutually supported and engaged, the outer box's rim and the annular groove of the lid form a mutually restrictive organic whole. In this way, the inner wall of the annular groove of the lid is also pushed outward, ensuring that the inner wall of the annular groove of the lid, the straight edge of the inner box's opening, and the inner straight edge of the outer box's rim always maintain a good pressure seal between adjacent pairs. When the container stops heating or the overall temperature of the container drops, the outer box temperature drops the fastest, and the inner straight edge of the outer box opening retracts radially the fastest. This radial retraction of the inner straight edge of the outer box opening pushes and causes the inner straight edge of the inner box opening and the inner wall of the annular groove of the lid to also retract radially simultaneously. During this process, adjacent components remain tightly pressed together, maintaining a good seal. Ultimately, this multi-layered composite inner sealing structure maintains good dynamic sealing performance under different heating conditions, overcoming the decrease in sealing performance at the container opening caused by the expansion and deformation of the container due to hot steam. The container can effectively maintain the sealing performance at the opening (preventing leakage). The entire container of this invention is a sealed container, which can effectively reduce heat loss during food heating or hot food delivery, and has good heat preservation / heating effects. This combined sealed food container can be widely used in hot food delivery, microwave heating, or steam heating, and can also be used as a container and cookware for outdoor cooking heating, sealed heat preservation, and other purposes.

[0025] 2. The inner box's support edge rests on the flat edge of the outer box's opening. That is, the inner box's support edge is above the outer box and located outside the outer box's containing space. The user's fingers can easily grasp the support edge from above the outer box (without needing to insert them into the outer box), making it easier to remove the inner box. The user's fingers will not contaminate the outer box's containing space. Furthermore, when the outer box contains a heating agent, hot soup, or hot beverage, the user will not be burned by the steam generated by the heating agent, hot soup, or hot beverage within the outer box's containing space. Moreover, the inner box's support edge will not be contaminated by the heating agent, hot soup, or hot beverage inside the outer box, ensuring that the user's fingers are not soiled when removing the inner box.

[0026] Furthermore, the outer groove wall of the annular groove of the cover and the outer straight edge of the outer box opening or their extensions abut against each other to form a sealing fit, adding an external sealing structure between the cover and the outer box. Moreover, when the inner box is removed, the cover can be put back on the outer box to maintain the sealing state of the outer box.

[0027] Furthermore, an annular gap is left between the circumferential sidewalls of the inner box body and the circumferential sidewalls of the outer box body. A sealing sheet is provided at the opening of the inner box body to seal against it. A gap is left between the upper surface of the sealing sheet and the cover plate of the lid. A gripping component is provided on the upper surface of the sealing sheet. By adding a sealing sheet at the opening of the inner box body, the inner box body becomes a relatively independent sealed container, preventing hot steam from rising to the lid and concentrating heat inside the inner box body. This effectively heats / keeps the food inside the inner box body and prevents the lid from deforming or arching due to heat. The gripping component allows for easy opening of the sealing sheet without contaminating fingers. Moreover, the inner box body is suspended like an island within the space enclosed by the lid and outer box body, with gaps on all sides. The air in these gaps provides good insulation for the inner box body.

[0028] Furthermore, the intersection of the flat edge of the outer box opening and the outer straight edge of the outer box opening is recessed inward, leaving a gap below the outer end of the support edge, which makes it easier to grip the support edge.

[0029] Furthermore, the intersection of the flat edge of the outer box opening and the outer straight edge of the outer box opening is a rounded chamfer; or, the upper section of the outer straight edge of the outer box opening is beveled. This provides a larger gap below the outer end of the support edge, making it easier to grip the support edge.

[0030] Furthermore, the outer end of the support edge of the inner box has an extension that extends downward along the outer straight edge of the outer box's opening rim, and the extension is locked to a corresponding portion of the outer straight edge of the outer box's opening rim by a first locking mechanism. That is, the extension is locked to the outer straight edge of the outer box's opening rim by the first locking mechanism, so that when the lid is opened, the inner box remains stably locked to the outer box, and the inner box is less likely to tip over and sink.

[0031] Furthermore, a second locking mechanism is provided on the outer wall of the annular groove of the cover for locking the lower end of the extension. The second locking mechanism limits and holds the lower end of the extension, further enhancing the overall container's anti-disengagement and anti-deformation capabilities.

[0032] Furthermore, the outer wall of the annular groove of the cover and the outer straight edge of the outer box opening are locked together by a third locking mechanism. The third locking mechanism limits and holds the outer wall of the annular groove of the cover to the outer straight edge of the outer box opening, further enhancing the overall container's anti-disengagement and anti-deformation capabilities.

[0033] Furthermore, a fourth locking mechanism is provided between the outer wall of the annular groove of the cover and the outer straight edge of the outer box opening. This fourth locking mechanism is located below the third locking mechanism and corresponds to the state where only the cover and the outer box are engaged. Since the support edge of the inner box has a certain thickness, when the inner box is removed and the cover needs to be re-closed to the outer box, there is a certain gap at the engagement point between the cover and the outer box. At this time, the cover can be pressed down further, so that the locking engagement between the cover and the outer box is achieved by replacing the original third locking mechanism with the fourth locking mechanism, thereby realizing the locking engagement between the cover and the outer box when the inner box is not present.

[0034] Furthermore, it also includes an open inner box, which is fitted inside the outer box. The bottom and circumferential sidewalls of the inner box are spaced apart from the bottom and circumferential sidewalls of the outer box, forming an air-insulated layer surrounding the main body of the inner box. A gap is also left between the bottoms of the inner and outer boxes, creating a space for holding a heating agent, hot soup, or hot beverage. The opening of the inner box has a straight rim, the upper end of which extends outward to form a support rim. A support step is provided at the lower end or below the inner straight rim of the outer box, and the support rim of the inner box rests on the support step. In use, food is placed inside the inner box, and the heating agent, hot soup, or hot beverage is placed inside the outer box. This allows for heating or keeping the food inside the inner box warm. The air-insulated layer surrounding the main body of the outer box effectively reduces heat loss from the entire container. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the vertical section of the container in Embodiment 1 of this utility model;

[0036] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0037] Figure 3 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 2 of this utility model;

[0038] Figure 4 This is a schematic diagram of the inner box and outer box of Embodiment 3 of this utility model;

[0039] Figure 5 This is a vertical cross-sectional view of the container in Embodiment 3 of this utility model;

[0040] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0041] Figure 7 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 4 of this utility model;

[0042] Figure 8 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 5 of this utility model;

[0043] Figure 9 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment Six of this utility model;

[0044] Figure 10 This is a schematic diagram of the fit between the cover and the outer box in Embodiment Six of this utility model;

[0045] Figure 11 This is a vertical cross-sectional view of the container in Embodiment 7 of this utility model;

[0046] Figure 12 for Figure 11 Enlarged view of point C in the middle;

[0047] Figure 13 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 8 of this utility model;

[0048] Figure 14 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 9 of this utility model;

[0049] Figure 15 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment 10 of this utility model;

[0050] Figure 16 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment Eleven of this utility model;

[0051] Figure 17 This is a vertical cross-sectional view of the container in Embodiment Twelve of this utility model;

[0052] Figure 18 for Figure 17 Enlarged view of point D in the middle;

[0053] Figure 19 This is a vertical cross-sectional view of the container in Embodiment Thirteen of this utility model;

[0054] Figure 20 This is a vertical cross-sectional view of the container in Embodiment Fourteen of this utility model;

[0055] Figure 21 for Figure 20 Enlarged view of point E in the middle;

[0056] Figure 22 This is a schematic diagram of the cooperation between the cover, inner box, and outer box in Embodiment 15 of this utility model;

[0057] Figure 23 This is a schematic diagram of the cooperation between the cover, inner box, and outer box in Embodiment Sixteen of this utility model;

[0058] Figure 24 This is a schematic diagram showing the fit between the cover, inner box, and outer box in Embodiment Seventeen of this utility model.

[0059] in:

[0060] 1-Cover body; 11-Inner groove wall; 12-Groove top; 13-Outer groove wall; 131-Bending part; 14-First protruding edge; 15-Fifth protruding edge; 16-Cover plate; 17-First protruding strip;

[0061] 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-Main body of the box; 211-Fourth protrusion; 212-Supporting step;

[0062] 3-Inner box body; 31-Straight edge of box opening; 32-Supporting edge; 321-Extension; 33-Fourth protruding edge; 34-Main body of box; 35-Second protruding strip; 36-Third protruding strip; 37-Supporting step; 38-Flat edge of box opening

[0063] 4- Annular gap;

[0064] 5-Sealing plate; 51-Pull ring; 52-Sealing edge;

[0065] 6-Gap;

[0066] 7-Another inner box; 71-Air-insulating insulation layer; 72-Accommodation space; 73-Straight edge of the box opening; 74-Supporting edge; 75-Step; Detailed Implementation

[0067] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0068] In this invention, the direction toward the central axis of the container is defined as inside, and the direction away from the central axis of the container is defined as outside; the direction toward the opening of the container is defined as above, and the direction away from the opening of the container is defined as below.

[0069] The terms "first," "second," "third," "fourth," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. The terms "comprising" and "provided with," and any variations thereof, are intended to cover non-exclusive inclusion.

[0070] Example 1:

[0071] The combined sealed food container of this utility model, as described in Embodiment 1... Figure 1-2As shown, the device includes a lid 1, an open outer box 2, and an open inner box 3. The lid 1 has a downward-opening annular groove formed by an inner groove wall 11, a groove top 12, and an outer groove wall 13 around its perimeter. The outer box 2 has a box mouth rim formed by an inner straight edge 21, a flat edge 22, and an outer straight edge 23 at its opening. The annular groove of the lid 1 is nested and fastened to the box mouth rim of the outer box 2. After the two are nested and fastened, the inner groove wall 11, the groove top 12, and the outer groove wall 13 are respectively arranged to correspond to the inner straight edge 21, the flat edge 22, and the outer straight edge 23. The lower end of the outer straight edge 23 of the outer box body 2 tilts downward and outward and presses against the inner side of the outer groove wall 13 of the annular groove of the cover body 1, so that the annular groove of the cover body 1 and the outer box body 2 press against each other and restrain each other in the inner and outer directions of the container, thereby making the annular groove of the cover body 1 and the outer box body 2 form a mutually restraining organic whole.

[0072] The inner box 3 is fitted inside the outer box 2, and a gap is left between the bottom of the inner box 3 and the bottom of the outer box 2 to form a space for holding heating agents, hot soup or hot drinks. This space can also be left empty as an air-insulated and heat-preserving area at the bottom. Furthermore, the size of the main body 34 of the inner box 3 can be designed to be slightly smaller than that of the outer box 2, so that an annular gap 4 is left between the main body 34 of the inner box 3 and the main body 210 of the outer box 2, forming a circumferential air-insulated and heat-preserving area.

[0073] The inner box 3 has a straight edge 31 at its opening, and the straight edge 31 of the inner box 3 is connected to the main body 34 of the inner box 3 by a flat edge 38. The inner groove wall 11 of the annular groove of the cover 1, the straight edge 31 of the opening of the first inner box 3, and the inner straight edge 21 of the outer box 2 are stacked sequentially from the inside to the outside, and adjacent ones press against each other to form a multi-layered composite inner sealing structure. The upper end of the straight edge 31 extends outward to form a support edge 32, which is supported on the flat edge 22 of the outer box 2.

[0074] In this embodiment, since the inner groove wall 11 of the annular groove of the cover 1 is sealed to the straight edge 31 of the opening of the first inner box 3, and the straight edge 31 of the opening of the first inner box 3 is also sealed to the inner straight edge 21 of the outer box 2, when the outer box 2 is removed, the cover 1 and the inner box 3 can still form a sealed container when they are closed together.

[0075] As a specific example, in this embodiment, the inner wall 11 of the annular groove of the cover 1 presses against the straight edge 31 of the opening of the inner box 3, and there is a small included angle between them, which is approximately between 1 degree and 12 degrees. In this way, the point where the inner wall 11 of the annular groove of the cover 1 presses against the straight edge 31 of the opening of the inner box 3 (the intersection of the outer side of the inner wall 11 of the annular groove of the cover 1 and the inner side of the straight edge 31 of the opening of the inner box 3) forms a sealing line. This sealing line is the intersection of two smooth curved surfaces. When the container is subjected to a large degree of pressure deformation, this sealing line also deforms along with the two smooth curved surfaces, but it can always maintain a closed loop state. That is, the line seal will not be destroyed, and the sealing structure is relatively stable.

[0076] The inner box 3's straight edge 31 presses against the outer box 2's double edge's inner straight edge 23, with a small angle between them, approximately between 1 and 12 degrees. The point where the inner straight edge 23 of the outer box 2's double edge's inner edge's inner edge's straight edge 31 presses against the outer box 3 (the intersection of the inner side of the outer box 2's double edge's inner straight edge 23 and the outer side of the inner box 3's double edge's inner edge's outer edge's outer edge's inner ... inner edge's outer edge's inner edge's outer edge's inner edge's outer edge's inner edge's outer edge's inner edge's outer edge's inner edge's inner edge's outer edge's inner edge's inner edge's inner edge's outer edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's inner edge's

[0077] In this embodiment, the sealing structure between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the box opening of the inner box 3, and the sealing structure between the straight edge 31 of the box opening of the inner box 3 and the inner straight edge 23 of the box opening of the outer box 2 can be specifically referred to the sealing structure disclosed in Chinese Invention Patent ZL201010265807.X.

[0078] After adopting the above solution, the present invention provides a combined sealed food container, wherein the opening of the inner box 3 is provided with a straight edge 31, and the upper end of the straight edge 31 extends outward to form a support edge 32. This support edge 32 is mounted on the flat edge 22 of the outer box 2's double edge. The inner groove wall 11 of the annular groove of the cover 1, the straight edge 31 of the inner box 3, and the inner straight edge 21 of the outer box 2's double edge are stacked sequentially from the inside to the outside, and adjacent ones press against each other for a sealing fit. Compared with the prior art, it has the following advantages:

[0079] 1. The inner groove wall 11 of the annular groove of the cover 1, the straight edge 31 of the opening of the inner box 3, and the inner straight edge 21 of the double edge of the opening of the outer box 2 are stacked sequentially from the inside out, and adjacent ones press against each other to form a sealing fit, forming a multi-layered composite inner sealing structure. Because the coefficient of thermal expansion of ultra-thin plastic is relatively high (several times higher than that of glass or metal), the container will expand significantly in the radial direction when heated. When a heating agent, hot soup, or hot beverage is placed in the outer box 2, the steam generated by this heating agent, hot soup, or hot beverage will heat the inner box 3. The inner box 3 has the highest temperature in the entire container. In the multi-overlapping composite inner sealing structure formed by the inner groove wall 11 of the annular groove of the lid 1, the straight edge 31 of the inner box 3's opening, and the inner straight edge 21 of the outer box 2's opening, the radial expansion of the straight edge 31 of the inner box 3 is greater, while the radial expansion of the inner groove wall 11 of the annular groove of the lid 1 and the inner straight edge 21 of the outer box 2's opening is smaller. The straight edge 31 of the inner box 3... The outer box body 2's outer opening edge 21 is pressed against the inner straight edge 23 of the outer box body 2's outer opening edge. However, since the outer straight edge 23 of the outer box body 2's outer opening edge and the outer groove wall 13 of the annular groove of the cover body 1, or their extensions, are mutually supported and engaged, the outer box body 2's outer opening edge and the annular groove of the cover body 1 form a mutually restrictive organic whole. In this way, the inner groove wall 11 of the annular groove of the cover body 1 is also driven to be pressed outward, so that the inner groove wall 11 of the annular groove of the cover body 1, the inner box body 3's outer opening edge 31, and the outer box body 2's outer opening edge 21 always maintain a good pressure sealing state between adjacent two of them. When the container stops heating or the overall temperature of the container drops, the temperature of the outer box 2 drops the fastest, and the radial retraction speed of the inner straight edge 21 of the outer box 2's opening is also the fastest. This radial retraction of the inner straight edge 21 of the outer box 2's opening pushes and causes the inner straight edge 31 of the inner box 3's opening and the inner groove wall 11 of the annular groove of the lid 1 to also retract radially simultaneously. During this process, the adjacent parts remain tightly pressed together, maintaining a good seal. Ultimately, this multi-layered composite inner sealing structure maintains good dynamic sealing performance under different heating conditions, overcoming the decrease in sealing performance at the container's opening edge caused by the upward arching deformation of the lid 1 due to hot steam. Therefore, the container does not need to have vent holes to maintain the sealing performance at the opening edge (preventing leakage) as in existing technologies. The entire container of this invention is a sealed container, which can effectively reduce heat loss during food heating or hot food delivery, and has good heat preservation / heating effects. This utility model of a combined sealed food container can be widely used for hot food delivery, microwave heating or steam heating, and can also be used as a container and cooking utensil for outdoor cooking heating, sealed heat preservation and other purposes.

[0080] 2. The support edge 31 of the inner box 3 is mounted on the flat edge 22 of the outer box 2's opening. That is, the support edge 31 of the inner box 3 is located above the outer box 2 and outside the outer box 2's containing space. The user's fingers can easily grasp the support edge 31 from above the outer box 2 (without needing to insert into the outer box 2), making it easier to remove the inner box 3. The user's fingers will not contaminate the outer box 2's containing space. Furthermore, when the outer box contains a heating agent, hot soup, or hot beverage, the user will not be burned by the steam generated by the heating agent, hot soup, or hot beverage within the outer box 2's containing space. Moreover, the support edge 31 of the inner box 3 will not be contaminated by the heating agent, hot soup, or hot beverage inside the outer box 2, ensuring that the user's fingers are not contaminated by the support edge 31 when removing the inner box 3.

[0081] Furthermore, the lower end of the outer straight edge 23 of the outer box body 2 tilts downward and outward, pressing against the inner side of the outer groove wall 13 of the annular groove of the lid body 1. The two are in a line-sealed fit at the pressing point, forming an outer sealing structure, which adds a sealing structure between the lid body 1 and the outer box body 2, improving the overall sealing performance of the container. Moreover, when the inner box body 3 is removed, the lid body 1 can be put back on the outer box body 2, and the outer box body 2 can still maintain its sealed state.

[0082] Furthermore, in this embodiment, to enhance the container's resistance to deformation and its ability to prevent disengagement, a third locking mechanism can be used to lock the outer groove wall 13 of the annular groove of the cover 1 and the outer straight edge 23 of the outer box 2's opening edge. In this embodiment, the third locking mechanism is a first protruding edge 14 located on the lower part of the inner side of the outer groove wall 13 of the annular groove of the cover 1. The lower end of the outer straight edge 23 of the outer box 2's opening edge rests against the inner side of the outer groove wall 13 of the annular groove of the cover 1 and abuts against the upper side of this first protruding edge 14. In this way, the annular groove of the cover 1 and the opening edge of the outer box 2 can be locked together in the vertical direction, preventing the cover 1 from disengaging and increasing the overall container's resistance to deformation.

[0083] Furthermore, to facilitate easier gripping of the support edge 32 of the inner box 3 when removing it, in this embodiment, the upper section of the outer straight edge 23 of the outer box 2's opening edge can be improved. This involves recessing the intersection of the flat edge 22 of the outer box 2's opening edge and the outer straight edge 23 of the outer box 2's opening edge inwards, leaving a gap below the outer end of the support edge 32. This gap allows the user's fingertips or nails to more easily grip the support edge 32. Specifically, the intersection of the flat edge 22 of the outer box 2's opening edge and the outer straight edge 23 of the outer box 2's opening edge can be designed as a chamfered arc, thus creating a gap 25 below the outer end of the support edge 32.

[0084] Furthermore, in this embodiment, the first protruding edge 14 can be configured as an intermittent structure. In this way, a pressure relief port is formed between the intermittent part of the first protruding 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, the steam can be discharged out of the container through this pressure relief port after breaking through the sealing structure at the edge of the container, thus ensuring the safe use of the container.

[0085] Example 2:

[0086] The combined sealed food container of this utility model, as shown in Embodiment Two... Figure 3 As shown, the difference between this embodiment and Embodiment 1 is only that: in this embodiment, the flat edge 22 of the outer box body 2 is recessed inward, and the upper section of the outer straight edge 23 of the outer box body 2 is inclined, leaving a larger gap 25 below the outer end of the support edge 32, which makes it easier to grasp the support edge 32.

[0087] Example 3:

[0088] The combined sealed food container of this utility model, as shown in Embodiment 3... Figure 4-6 As shown, the difference between this embodiment and Embodiment 1 is only that: in this embodiment, one or more of the flat edges 22 of the outer box body 2 are recessed downwards, forming one or more recessed notches 26 on the outer box body 2 that correspond to the support edge 32 of the inner box body 3. The user's fingertips or nails can be inserted into these notches 26 to more easily grasp the support edge 32, thereby making it easy to remove the inner box body 3.

[0089] In this embodiment, the container is a square container with four notches 26, which are respectively set at the four corners of the square container.

[0090] Furthermore, in this embodiment, the inner side of the outer groove wall 13 of the annular groove of the cover 1 and the outer side of the outer straight edge 23 of the box opening of the outer box 2 abut against each other to form an outer sealing structure. Furthermore, the lower end of the outer straight edge 23 of the outer box body 2 extends outward and upward sequentially, 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 small section of this U-shaped protective groove 27 may be provided with an easy-pull strip. When 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 protective groove 27, making it difficult to open the cover body 1 by hand. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a gap appears in the U-shaped protective groove 27, which can expose part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1, thereby easily holding this lower end and lifting the cover body 1 upward. When the outer straight edge 23 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 protruding edge 24 provided on the inner side of the outer groove wall of the U-shaped protective groove 27. 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 tilts and abuts against the inner side of the outer groove wall of the U-shaped protective groove 27 against the lower side of the second protruding edge 24.

[0091] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually engaged in the inward and outward directions. This mutual engagement not only forms an external sealing structure but also, through the mutual engagement in the inward and outward directions, makes the outer box body 2's opening edge and the annular groove of the cover body 1 a mutually constraining organic whole. Simultaneously, the engagement between the lower end of the outer groove wall 13 of the annular groove of the cover body 1 and the outer groove wall of the U-shaped protective groove 27 further enhances the mutual constraint between the outer box body 2's opening edge and the annular groove of the cover body 1.

[0092] In addition, the second protruding edge 24 locks the annular groove of the cover 1 and the box opening edge of the outer box 2 together in the vertical direction, thereby preventing the cover 1 from falling off and increasing the overall resistance to deformation of the container.

[0093] Example 4:

[0094] The combined sealed food container of this utility model, as shown in Embodiment Four... Figure 7As shown, the difference between this embodiment and Embodiment 2 is only that: in this embodiment, the lower end of the outer straight edge 23 of the outer box body 2 extends outward and upward sequentially, 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 small section of this U-shaped protective groove 27 can be provided with an easy-pull strip. When 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 protective groove 27, making it difficult to open the cover body 1 by hand. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a gap appears in the U-shaped protective groove 27, which can expose part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1, thereby easily holding this lower end and lifting the cover body 1 upward. The third locking mechanism adopts a second protruding edge 24 on the inner side 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 1 extends outward and upward in sequence, and finally tilts and abuts against the inner side of the outer groove wall of the U-shaped protective groove 27 against the lower side of the second protruding edge 24.

[0095] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually engaged in the inward and outward directions. This mutual engagement not only forms an external sealing structure but also, through the mutual engagement in the inward and outward directions, makes the outer box body 2's opening edge and the annular groove of the cover body 1 a mutually constraining organic whole. Simultaneously, the engagement between the lower end of the outer groove wall 13 of the annular groove of the cover body 1 and the outer groove wall of the U-shaped protective groove 27 further enhances the mutual constraint between the outer box body 2's opening edge and the annular groove of the cover body 1.

[0096] In addition, the second protruding edge 24 locks the annular groove of the cover 1 and the box opening edge of the outer box 2 together in the vertical direction, thereby preventing the cover 1 from falling off and increasing the overall resistance to deformation of the container.

[0097] Example 5:

[0098] The combined sealed food container of this utility model, as shown in Embodiment Five... Figure 8As shown, the difference between this embodiment and Embodiment 1 lies only in that: in this embodiment, the outer end of the support edge 32 of the inner box 3 has an extension 321 extending downward along the outer straight edge 23 of the outer box 2's opening edge, and the extension 33 and the corresponding part of the outer straight edge 23 of the outer box 2's opening edge are locked together by a first locking mechanism. In this embodiment, the first locking mechanism includes a third protruding edge 28 disposed on the outer side of the outer straight edge 23 of the outer box 2's opening edge, and a fourth protruding edge 33 disposed on the extension 321 of the support edge 32 of the inner box 3. The third protruding edge 28 and the fourth protruding edge 33 engage and lock together. Specifically, in the locked state, the fourth protruding edge 33 abuts against the lower side of the third protruding edge 28. Thus, when the lid 1 is opened, the inner box 3 can still be stably locked together with the outer box 2, and the inner box 3 is not easily tipped over or sinks.

[0099] Furthermore, in this embodiment, the sealing structure between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the opening of the first inner box 3, and between the straight edge 31 of the opening of the first inner box 3 and the inner straight edge 21 of the outer box 2, is different from that in Embodiment 1. Specifically, in this embodiment, at least a portion of the inner groove wall 11 of the annular groove of the cover 1 and at least a portion of the straight edge 31 of the box opening of the inner box 3 undergo elastic deformation, and the two deform together to form an inner deformation self-locking area, thereby achieving a sealed fit between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the box opening of the inner box 3; at least a portion of the straight edge 31 of the box opening of the inner box 3 and at least a portion of the inner straight edge 21 of the outer box 2 undergo elastic deformation, and the two deform together to form an outer deformation self-locking area, thereby achieving a sealed fit between the straight edge 31 of the box opening of the inner box 3 and the inner straight edge 21 of the outer box 2.

[0100] In this embodiment, the sealing structure used between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the opening of the first inner box 3, and between the straight edge 31 of the opening of the first inner box 3 and the inner straight edge 21 of the inner edge of the opening of the outer box 2, can refer to the sealing structure disclosed in Chinese Invention Patent Application 202410178603.4.

[0101] Furthermore, in this embodiment, a second locking mechanism for locking the lower end of the extension 321 can also be provided on the outer groove wall 13 of the annular groove of the cover 1. Specifically, the second locking mechanism adopts a fifth protrusion 15 provided on the inner side of the outer groove wall 13 of the annular groove of the cover 1. In the locked state, the lower end of the extension 321 abuts against the upper side of the fifth protrusion 15, and the lower end of the extension 321 is locked by the fifth protrusion 15, thereby further enhancing the anti-disengagement capability and anti-deformation capability of the entire container.

[0102] Example 6:

[0103] The combined sealed food container of this utility model, as shown in Embodiment Six... Figure 9-10 As shown, the difference between this embodiment and Embodiment 1 is only that: the lower middle part of the outer groove wall 13 of the annular groove of the cover 1 has an outwardly bent portion 131, and the sealing point of the outer groove wall 13 of the annular groove of the cover 1 and the outer straight edge 23 of the outer box 2 corresponds to the upper inflection point of the bent portion 131. The third locking mechanism adopts a mating structure of the first protruding edge 14 and the sixth protruding edge 29. The sixth protruding edge 29 is disposed on the outer side surface of the outer straight edge 23 of the outer box 2. In the locked state, the first protruding edge 14 and the sixth protruding edge 29 are engaged and the first protruding edge 14 is located below the sixth protruding edge 29. A fourth locking mechanism is provided between the outer groove wall 13 of the annular groove of the cover 1 and the outer straight edge 23 of the box opening of the outer box 2. This fourth locking mechanism adopts a cooperative structure of the first protruding edge 14 and the seventh protruding edge 291. The seventh protruding edge 291 is located below the sixth protruding edge 29. In the locked state, the first protruding edge 14 and the seventh protruding edge 291 are engaged and the first protruding edge 14 is located below the seventh protruding edge 291.

[0104] Because the supporting edge 32 of the inner box 3 has a certain thickness, when the inner box 3 is removed and the lid 1 needs to be reattached to the outer box 2, there is a certain gap at the joint between the lid 1 and the outer box 2. At this point, the lid 1 can be pressed further down, so that the locking mechanism between the lid 1 and the outer box 2 is replaced by a fourth locking mechanism instead of the original third locking mechanism. That is, as shown... Figure 10 As shown, the first protruding edge 14 changes from engaging with the sixth protruding edge 29 to engaging with the seventh protruding edge 291, thereby realizing the locking engagement between the cover 1 and the outer box 2 in the absence of the inner box 3.

[0105] In this embodiment, by designing the inner straight edge 21 of the outer box body 2's opening edge as a suitable bending structure, when the inner box body 3 is taken out, the inner groove wall 11 of the annular groove of the cover body 1 and the inner straight edge 21 of the outer box body 2's opening edge also form a top-pressure sealing structure. When the inner box body 3 is taken out, the cover body 1 is put back on the outer box body 2, and the cover body 1 and the outer box body 2 can still form a conventional sealed container.

[0106] Furthermore, in this embodiment, the lower end of the outer straight edge 23 of the outer box body 2 extends outward and upward sequentially, 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 small section of this U-shaped protective groove 27 may be provided with an easy-pull strip. When 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 protective groove 27, making it difficult to open the cover body 1 by hand. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a gap appears in the U-shaped protective groove 27, which can expose part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1, thereby easily holding this lower end and lifting the cover body 1 upward.

[0107] Example 7:

[0108] The combined sealed food container of this utility model, as shown in Embodiment Seven... Figure 11-12 As shown, the difference between this embodiment and Embodiment 1 is only that: in this embodiment, the opening of the inner box 3 is covered with a sealing sheet 5 that seals with the opening of the inner box 3. A gap 6 is left between the upper surface of the sealing sheet 5 and the cover plate 16 of the cover 1. A gripping component is provided on the upper surface of the sealing sheet 5. This gripping component can be a pull ring 51. For ease of operation, the pull ring 51 can be set in the middle of the upper surface of the sealing sheet 5 (located in the gap 6).

[0109] In this embodiment, the sealing structure at the opening between the sealing sheet 5 and the inner box 3 can adopt various existing sealing structures, such as... Figure 12 As shown, the periphery of the sealing sheet 5 has a sealing edge 52 extending outward and upward, which presses against the straight edge 31 of the inner box 3 to form a sealing structure.

[0110] In this embodiment, by adding a sealing sheet 5 at the opening of the inner box 3, the inner box 3 becomes a relatively independent sealed container. This further protects the food inside the inner box 3 from contamination and prevents hot steam from rising to the lid 1, concentrating heat inside the inner box 3. This effectively heats / keeps the food inside the inner box 3 and prevents the lid 1 from deforming or arching due to heat. The pull ring 51 allows for easy opening of the sealing sheet 5 without contaminating fingers. Furthermore, the main body 34 of the inner box 3 is suspended like an island within the space enclosed by the lid 1 and the outer box 2, with gaps all around, forming an enclosed air-insulated layer. The air within this layer provides good insulation for the inner box 3.

[0111] Example 8:

[0112] The combined sealed food container of this utility model, as shown in Embodiment Eight... Figure 13As shown, the difference between this embodiment and embodiment seven is only that: in this embodiment, the lower end of the outer straight edge 23 of the outer box body 2 extends outward and upward sequentially, 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 small section of this U-shaped protective groove 27 can be provided with an easy-pull strip. When 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 protective groove 27, making it difficult to open the cover body 1 by hand. When the easy-pull strip of the U-shaped protective groove 27 is torn off, a gap appears in the U-shaped protective groove 27, which can expose part or all of the lower end of the outer groove wall 13 of the annular groove of the cover body 1, thereby easily holding this lower end and lifting the cover body 1 upward. When the outer straight edge 23 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 protruding edge 24 provided on the inner side 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 tilts and abuts against the inner side of the outer groove wall of the U-shaped protective groove 27 against the lower side of the second protruding edge 24.

[0113] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually engaged in the inward and outward directions. This mutual engagement not only forms an external sealing structure but also, through the mutual engagement in the inward and outward directions, makes the outer box body 2's opening edge and the annular groove of the cover body 1 a mutually constraining organic whole. Simultaneously, the engagement between the lower end of the outer groove wall 13 of the annular groove of the cover body 1 and the outer groove wall of the U-shaped protective groove 27 further enhances the mutual constraint between the outer box body 2's opening edge and the annular groove of the cover body 1.

[0114] In addition, the second protruding edge 24 locks the annular groove of the cover 1 and the box opening edge of the outer box 2 together in the vertical direction, thereby preventing the cover 1 from falling off and increasing the overall resistance to deformation of the container.

[0115] Furthermore, in this embodiment, one or more of the flat edges 22 of the outer box body 2 are recessed downwards, forming one or more recessed notches 26 on the outer box body 2 that correspond to the support edge 32 of the inner box body 3. The user's fingertips or nails can be inserted into these notches 26 to more easily grasp the support edge 32, thereby making it easy to remove the inner box body 3.

[0116] In the above embodiments of this utility model, through reasonable design, the sealing line or sealing area between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the opening of the first inner box 3, and the sealing line or sealing area between the straight edge 31 of the opening of the first inner box 3 and the inner straight edge 21 of the outer box 2 are respectively located above and below the recess 26. In this way, the recess 26 can be provided in each of the above embodiments without affecting the sealing performance of the entire container.

[0117] Example 9:

[0118] The combined sealed food container of this utility model, as shown in Embodiment Nine... Figure 14 As shown, the difference between this embodiment and Embodiment 1 lies only in that: in this embodiment, other sealing structures are used to achieve a sealing fit between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the box opening of the inner box 3, and between the straight edge 31 of the box opening of the inner box 3 and the inner straight edge 21 of the box opening of the outer box 2. Specifically: a first protrusion 17 is provided on the outer side of the inner groove wall 11 of the annular groove of the cover 1, a second protrusion 35 is provided on the inner side of the straight edge 31 of the box opening of the inner box 3, a third protrusion 36 is provided on the outer side of the straight edge 31 of the box opening of the inner box 3, and a fourth protrusion 211 is provided on the inner side of the inner straight edge 21 of the box opening of the outer box 2. The inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the box opening of the inner box 3 are mutually pressed and sealed by the engagement of the first protrusion 17 and the second protrusion 35; the straight edge 31 of the box opening of the first inner box 3 and the inner straight edge 21 of the box opening of the outer box 2 are mutually pressed and sealed by the engagement of the fourth protrusion 211 and the third protrusion 36.

[0119] Example 10:

[0120] The combined sealed food container of this utility model, as shown in Embodiment Ten. Figure 15 As shown, the difference between this embodiment and Embodiment 1 lies only in that: in this embodiment, the inner groove wall 11 of the annular groove of the cover and the straight edge 31 of the inner box opening, as well as the straight edge 31 of the inner box opening and the inner straight edge 21 of the outer box opening, are sealed using other sealing structures. Specifically, a first protrusion 17 is provided on the outer side of the inner groove wall 11 of the annular groove of the cover 1, and a third protrusion 36 is provided on the outer side of the straight edge 31 of the inner box opening. The inner groove wall 11 of the annular groove of the cover and the straight edge 31 of the inner box opening are sealed by the mutual pressing of the first protrusion 17 and the straight edge 31 of the inner box opening; the straight edge 31 of the inner box opening and the inner straight edge 21 of the outer box opening are sealed by the mutual pressing of the third protrusion 36 and the inner straight edge 21 of the outer box opening.

[0121] Example 11:

[0122] The combined sealed food container of this utility model, as described in Example Eleven. Figure 16 As shown, the difference between this embodiment and Embodiment 1 lies only in that: in this embodiment, the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the inner box 3, as well as the straight edge 31 of the inner box 3 and the inner straight edge 21 of the outer box 2, are sealed using other sealing structures. Specifically: the inner side of the straight edge 31 of the inner box is provided with a second protrusion 35, and the inner side of the inner straight edge 21 of the outer box is provided with a fourth protrusion 211. The inner groove wall 11 of the annular groove of the cover and the straight edge 31 of the inner box are sealed by the mutual pressing of the second protrusion 35 and the inner groove wall 11 of the annular groove of the cover 1; the straight edge 31 of the inner box and the inner straight edge 21 of the outer box are sealed by the mutual pressing of the fourth protrusion 211 and the straight edge 31 of the inner box.

[0123] Example 12:

[0124] The combined sealed food container of this utility model, as described in Embodiment Twelve... Figure 17 and Figure 18 As shown, in this embodiment, the sealing fit between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the box opening of the inner box 3, and between the straight edge 31 of the box opening of the first inner box 3 and the inner straight edge 21 of the box opening of the outer box 2, can be achieved by using the sealing structures in the above embodiments or their deformations and combinations.

[0125] The only difference between this embodiment and the above embodiments is that an additional open inner box 7 is added. The other inner box 7 is fitted inside the outer box 2, and the inner box 3 is fitted inside the other inner box 7. A step 75 is provided inside the other inner box 7 at the lower position corresponding to the inner box 3, so as to support the inner box 3 in case of an emergency. The bottom and circumferential sidewalls of the other inner box 7 are respectively spaced from the bottom and circumferential sidewalls of the outer box 2, forming an air-insulated heat-insulating layer 71 that surrounds the main body of the other inner box 7. The bottom of the inner box 3 is also spaced from the bottom of the other inner box 7, forming a space 72 for holding a heating agent, hot soup, or hot beverage. The opening of the other inner box 7 is provided with a straight edge 73. The upper end of the straight edge 73 of the other inner box 7 extends outward to form a support edge 74. A support step 212 is provided at or below the inner straight edge 21 of the outer box 2. The support edge 74 of the other inner box 7 is supported on the support step 212. When in use, food is placed in the inner box 3, and a heating agent, hot soup, or hot drink is placed in the other inner box 7 (the heating agent can be a self-heating pack, and water is placed in the other inner box 7, with the self-heating pack soaking in the water). This can heat or keep the food in the inner box 3 warm. The air-insulating layer 71 surrounding the main body of the other inner box 7 can effectively reduce the heat loss of the entire container.

[0126] Example 13:

[0127] The combined sealed food container of this utility model, as described in Embodiment Thirteen... Figure 19 As shown, the difference between this embodiment and embodiment twelve is only that a sealing sheet 5 is provided at the opening of the inner box 3, making the inner box 3 a relatively independent sealed container, preventing hot steam from rising to the lid 1, concentrating heat inside the inner box 3, effectively heating / keeping the food inside the inner box 3, and also effectively preventing the lid 1 from deforming and arching due to heat. The pull ring 51 provided allows for easy opening of the sealing sheet 5 without contaminating fingers. Moreover, the main body 34 of the inner box 3 is in a suspended island state within the space enclosed by the lid 1 and another inner box 7, with gaps all around, forming an enclosed air-insulated layer, in which the air has a good heat-insulating effect on the inner box 3. In this embodiment, the arrangement of the sealing sheet 5 can refer to the above embodiment seven.

[0128] Example 14:

[0129] The combined sealed food container of this utility model, as described in Embodiment Fourteen... Figure 20 and Figure 21As shown, the difference between this embodiment and embodiment twelve is only that: the inner box 3 is fitted inside the outer box 2, and the other inner box 7 is fitted inside the inner box 3. A step 38 is provided inside the inner box 3 corresponding to the lower part of the other inner box 7, to support the other inner box 7 in case of an emergency. A gap is left between the bottom and circumferential sidewalls of the inner box 3 and the bottom and circumferential sidewalls of the outer box 2, forming an air-insulated layer surrounding the main body of the inner box 3. A gap is also left between the bottom of the other inner box 7 and the bottom of the inner box 3, forming a space for holding a heating agent, hot soup, or hot beverage. A supporting step 37 is provided at or below the lower end of the straight edge 31 of the inner box 3, and the supporting edge 74 of the other inner box 7 is supported on the supporting step 37 of the inner box.

[0130] Example 15:

[0131] The combined sealed food container of this utility model, as described in Embodiment Fifteen... Figure 22 As shown, the difference between this embodiment and embodiment three is only that: the outer groove wall 13 of the annular groove of the cover 1 does not have an extension, and the lower end of the outer groove wall 13 of the annular groove of the cover 1 extends into the U-shaped protective groove 27 formed by the extension of the outer straight edge 23 of the outer box opening.

[0132] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually supported and engaged in the inner and outer directions. The mutual support and engagement of the two not only forms an outer sealing structure, but also makes the outer box body 2 and the annular groove of the cover body 1 form a mutually restrictive organic whole through the mutual support and engagement of the two in the inner and outer directions.

[0133] Example 16:

[0134] The combined sealed food container of this utility model, as described in Embodiment Sixteen... Figure 23 As shown, the difference between this embodiment and embodiment fifteen is only that: the lower end of the outer groove wall 13 of the annular groove of the cover 1 is provided with an outwardly extending part. This extension part is at a certain distance from the bottom of the U-shaped protective groove 27. When the easy-pull strip of the U-shaped protective groove 27 is torn open, a notch appears in the U-shaped protective groove 27. Through this notch, the extension part of the lower end of the outer groove wall 13 of the annular groove of the cover 1 can be held, so that the cover 1 can be opened more easily.

[0135] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually supported and engaged in the inner and outer directions. The mutual support and engagement of the two not only forms an outer sealing structure, but also makes the outer box body 2 and the annular groove of the cover body 1 form a mutually restrictive organic whole through the mutual support and engagement of the two in the inner and outer directions.

[0136] Example 17:

[0137] The combined sealed food container of this utility model, as described in Embodiment Seventeen... Figure 24 As shown, the difference between this embodiment and Embodiment Sixteen is only that the extension portion extending outward from the lower end of the outer groove wall 13 of the annular groove of the cover 1 is lengthened, and finally abuts against the inner side of the outer groove wall of the U-shaped protective groove 27, abutting against the lower side of the second protruding edge 24. When the easy-open strip of the U-shaped protective groove 27 is torn open, a notch appears in the U-shaped protective groove 27, and the extension portion at the lower end of the outer groove wall 13 of the annular groove of the cover 1 can be grasped through this notch, thereby making it easier to open the cover 1.

[0138] In this embodiment, the outer straight edge 23 of the outer box body 2 and the outer groove wall 13 of the annular groove of the cover body 1 are mutually engaged in the inward and outward directions. This mutual engagement not only forms an external sealing structure but also, through the mutual engagement in the inward and outward directions, makes the outer box body 2's opening edge and the annular groove of the cover body 1 a mutually constraining organic whole. Simultaneously, the engagement between the lower end of the outer groove wall 13 of the annular groove of the cover body 1 and the outer groove wall of the U-shaped protective groove 27 further enhances the mutual constraint between the outer box body 2's opening edge and the annular groove of the cover body 1.

[0139] In addition, the second protruding edge 24 also locks the annular groove of the cover 1 and the box opening edge of the outer box 2 together in the vertical direction, preventing the cover 1 from falling off and increasing the overall resistance to deformation of the container.

[0140] In this utility model, the sealing structures between the inner groove wall 11 of the annular groove of the cover 1 and the straight edge 31 of the opening of the first inner box 3, between the straight edge 31 of the opening of the first inner box 3 and the inner straight edge 21 of the outer box 2, and between the outer groove wall 13 of the annular groove of the cover 1 and the outer straight edge 23 of the outer box 2 can all adopt various existing sealing structures that can achieve mutual pressure sealing between the two.

[0141] In all the embodiments of this utility model described above, a sealing sheet 5 may be provided.

[0142] In the above embodiments of this utility model, the outer end of the support edge 32 of the inner box 3 can be provided with an extension 321, and the extension is locked in place by the first locking mechanism.

[0143] In the above embodiments of this utility model, each protruding edge in the third locking mechanism can be set as an intermittent structure. Similarly, in the embodiment with a fourth locking mechanism, the seventh protruding edge 291 of the fourth locking mechanism can also be set as an intermittent structure, so that the discontinuity of these protruding edges forms a pressure relief port between the corresponding outer groove wall or outer straight edge. When the steam pressure in the container exceeds the limit, the steam can be discharged out of the container through this pressure relief port after breaking through the sealing structure at the edge of the container opening, thus ensuring the safe use of the container.

[0144] In this utility model, the inner box 3 can adopt a multi-compartment structure. Correspondingly, the lower surface of the cover plate 16 of the cover 1 is provided with sealing strips that correspond to the opening edges of each compartment. After the cover 1 is closed, each compartment is an independent sealed cavity, which can effectively prevent the food in each compartment from tasting each other or being mixed together.

[0145] In this invention, in various embodiments with a sealing sheet 5, a through-hole (not shown in the figure) can be opened along the thickness direction on the flat edge 38 of the inner box 3. Hot steam generated inside the outer box 2 can enter the interior of the inner box 3 through this vent, directly contacting the food inside the inner box 3, thus enhancing the heating and heat preservation effect on the food. Due to the presence of the sealing sheet 5, hot steam generated inside the outer box 2 can be prevented from directly reaching the lid 1, thereby avoiding various problems caused by hot steam directly reaching the lid 1.

[0146] This utility model of a combined sealed food container can be widely used for hot food delivery, microwave heating or steam heating, and can also be used as a container and cooking utensil for outdoor cooking heating, sealed heat preservation and other purposes.

[0147] The embodiments described in this utility model are merely some, not all, of the embodiments of this utility model. Based on the embodiments shown, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. All other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A combined airtight food container, comprising a lid, an open outer box, and an open inner box; The periphery of the cover is provided with a downward-opening annular groove consisting of an inner groove wall, a groove top, and an outer groove wall. The opening of the outer box is provided with a box mouth rim consisting of an inner straight edge, a flat edge, and an outer straight edge; The annular groove of the cover is nested and fastened to the outer box opening edge; The outer straight edge of the box opening is engaged with the outer groove wall of the annular groove, or the extension of the outer straight edge of the box opening is engaged with the extension of the outer groove wall of the annular groove. The inner box is fitted inside the outer box, and a gap is left between the bottom of the inner box and the bottom of the outer box; characterized in that: The inner box has a straight edge at its opening. The inner wall of the annular groove of the cover, the straight edge of the inner box, and the inner straight edge of the outer box are stacked sequentially from the inside out, with adjacent ones pressing against each other to form an inner sealing structure. The upper end of the straight edge of the inner box extends outward to form a support edge, which is supported on the flat edge of the outer box.

2. The combined sealed food container according to claim 1, characterized in that: The inner wall of the annular groove of the cover presses against the straight edge of the box opening of the inner box and there is an angle of 1-12 degrees between them. The straight edge of the box opening of the inner box and the inner straight edge of the box opening of the outer box press against each other and there is an angle of 1-12 degrees between them. Alternatively, a portion of the inner groove wall of the annular groove of the cover and / or a portion of the straight edge of the inner box opening elastically deforms and the two deform together to form an inner deformation self-locking area; a portion of the straight edge of the inner box opening and / or a portion of the inner straight edge of the outer box opening double edge elastically deforms and the two deform together to form an outer deformation self-locking area. Alternatively, a protrusion strip can be used to achieve a sealing fit between adjacent parts of the inner groove wall of the annular groove of the cover, the straight edge of the opening of the inner box, and the inner straight edge of the double edge of the opening of the outer box.

3. The combined sealed food container according to claim 1 or 2, characterized in that: The outer wall of the annular groove of the cover and the outer straight edge of the outer box opening are mutually abutted to form an external sealing structure; or, the extension of the outer wall of the annular groove of the cover and the extension of the outer straight edge of the outer box opening are mutually abutted 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 sidewall of the inner box body and the circumferential sidewall of the outer box body. A sealing sheet is provided at the opening of the inner box body to seal and cooperate 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. 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 outer box opening and the outer straight edge of the outer box opening is recessed inward, leaving a gap below the outer end of the support edge.

6. The combined sealed food container according to claim 5, characterized in that: The intersection of the flat edge of the outer box opening and the outer straight edge of the outer box opening is an arc-shaped chamfer; or, the upper section of the outer straight edge of the outer box opening is a bevel.

7. The combined sealed food container according to claim 1, characterized in that: The outer end of the support edge of the inner box has an extension that extends downward along the outer straight edge of the outer box opening, and the extension and the corresponding part of the outer straight edge of the outer box opening are locked together by a first locking mechanism.

8. The combined sealed food container according to claim 7, characterized in that: The outer wall of the annular groove of the cover is provided with a second locking mechanism for locking the lower end of the extension.

9. The combined sealed food container according to claim 1, characterized in that: The outer wall of the annular groove of the cover and the outer straight edge of the box opening of the outer box are locked together by 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 wall of the annular groove of the cover and the outer straight edge of the box opening of the outer box. This fourth locking mechanism is located below the third locking mechanism and corresponds to the state in which only the cover and the outer box are engaged together.

11. The combined sealed food container according to claim 1, characterized in that: It also includes another open inner box, which is fitted inside the outer box. The bottom and circumferential sidewalls of the other inner box are respectively spaced from the bottom and circumferential sidewalls of the outer box, forming an air-insulated layer surrounding the main body of the other inner box. There is also a gap between the bottom of the inner box and the bottom of the other inner box, forming a space for holding a heating agent, hot soup, or hot beverage. The opening of the other inner box has a straight edge, and the upper end of the straight edge of the other inner box 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, and the support edge of the other inner box is supported on the support step.

12. The combined sealed food container according to claim 11, characterized in that: The inner box is fitted inside the outer box, and the other inner box is fitted inside the inner box. The bottom and circumferential sidewalls of the inner box are respectively spaced with the bottom and circumferential sidewalls of the outer box, forming an air-insulated heat-insulating layer surrounding the main body of the inner box. The bottom of the other inner box is also spaced with the bottom of the inner box, forming a space for holding a heating agent, hot soup, or hot drinks. A support step is provided at or below the lower end of the straight edge of the inner box opening, and the support edge of the other inner box is mounted on the support step of the inner box.

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

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