Packaging box capable of reheating food

Abstract

The invention provides a packaging box capable of reheating food, and belongs to the technical field of food packaging boxes. The technical problem that an existing self-heating food box cannot adapt to take-out and take-out scenes is solved. According to the packaging box capable of reheating the food, a middle box is placed in a bottom box, a cavity used for containing a heating bag is formed between the lower side face of the middle box and the bottom of the bottom box, a turned edge protruding outwards is formed on the upper portion of the middle box, the turned edge and the upper edge of the bottom box are assembled in a loose mode, and a top cover is detachably connected with the edge of the middle box in a sealed mode. A containing cavity used for containing food is defined by the top cover and the middle box, a lower vent hole capable of communicating the containing cavity with the outside is formed in the top cover, and an anti-leakage plug for preventing soup from leaking is installed at the position of the lower vent hole. The device has the advantages of being low in gravity center, stable in placement, free of leakage, safe in heating and the like, and can well adapt to take-out and take-out use scenes.

Description

Technical Field

[0001] This invention belongs to the field of food packaging box technology, specifically referring to a packaging box capable of reheating food. Background Technology

[0002] With the rapid pace of modern life, ordering takeout or packing food has become commonplace for many. Most restaurants provide containers for takeout orders or convenient food delivery. However, the time between food preparation and arrival at home typically takes half an hour to an hour, during which the food cools down quickly, especially in winter. While it can be reheated in a microwave at home, it's often unsuitable for outdoor dining or at the office, affecting both taste and health. Although many businesses use insulated bags for containers and delivery boxes offer some insulation, these measures only slow down heat loss. By the time customers eat, the food's calorie content is still significantly different from when it was freshly prepared.

[0003] Currently, most self-heating food containers are used to heat pre-cooked dishes and hot pots. The ingredients are vacuum-packed, and the ingredients, packaging box, and heating pack are sold as a whole. Generally, this includes an outer box, a food container, a lid, a heating pack, and the vacuum-packed ingredients. To use, first remove the ingredients from the vacuum packaging bag and place them into the food container, then add water to the container. Next, place the heating pack inside the outer box, add water to the outer box, then place the food container inside the outer box and close the lid. Wait for the heating pack to come into contact with the water and generate heat to heat the food inside the container, then it's ready to eat.

[0004] However, existing self-heating food containers have the following drawbacks, making them unsuitable for takeout or delivery scenarios:

[0005] 1. In order to ensure that semi-raw or fully raw food can be heated to a edible state, the existing self-heating food boxes are designed with a large outer box volume and sufficient depth to ensure a large heating area. As a result, the height of self-heating food boxes is generally high. The excessive height causes a waste of space, which affects the number of food deliveries that deliverymen can carry in their delivery boxes. At the same time, the excessive height also makes the self-heating food boxes easy to tip over during transportation.

[0006] 2. Existing self-heating food containers are only used when needed, so they do not have a leak-proof design. In the context of takeout or delivery, the soup inside the container is prone to leaking out due to the unavoidable vibration or shaking during delivery or delivery.

[0007] 3. Existing self-heating food containers require opening the lid, removing the food container, operating the heating pack, placing the food container back into the outer box, and finally closing the lid. The entire process is cumbersome, and the steam generated by the heating pack directly contacts the food in the container, posing a food safety hazard.

[0008] Therefore, how to provide a packaging box that can reheat food and adapt to takeout and delivery scenarios has become an urgent technical problem to be solved. Summary of the Invention

[0009] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a packaging box that can reheat food and is suitable for takeout and delivery scenarios.

[0010] The objective of this invention can be achieved through the following technical solutions:

[0011] A packaging box capable of reheating food includes a top cover, a bottom box with an opening on the upper side, and a middle box. The middle box is placed inside the bottom box, and a cavity for accommodating a heating pack is provided between the lower side of the middle box and the bottom of the bottom box. An outwardly protruding flange is formed on the upper part of the middle box, and the flange is loosely fitted to the upper edge of the bottom box. The top cover is detachably and sealingly connected to the edge of the middle box. The top cover and the middle box together form a receiving cavity for accommodating food. The top cover has a lower vent that connects the receiving cavity to the outside, and a leak-proof plug is installed at the lower vent to prevent leakage of soup or liquid.

[0012] The top lid and the inner box of this packaging box are detachably and sealed along their edges. The lower vent on the top lid is fitted with a leak-proof plug to minimize leakage of liquid from the food inside the inner box during takeout or delivery. It also prevents gas generated during heating from coming into contact with the food, ensuring greater hygiene and safety. Placing the inner box within the bottom box reduces the overall vertical height of the packaging, resulting in a more compact structure. This minimizes the space occupied during takeout or delivery and lowers the center of gravity when filled with food, making the packaging less prone to tipping over. This avoids the situation where the soup leaks out when the container is tilted. Furthermore, since this packaging box is mainly designed for takeout and delivery scenarios, the food inside the middle box is already cooked and retains residual heat or has not cooled down for long. Therefore, no additional water needs to be added when heating this packaging box. The heating pack only needs to ensure that the food inside the middle box is heated to a slightly hot temperature to restore its taste, without heating it to a complete boil. Therefore, the cavity height between the bottom of the middle box and the bottom box can be designed to be more compact as needed, further reducing the overall height of the packaging box while meeting heating requirements, making the center of gravity of the entire packaging box lower and more stable.

[0013] In the above-mentioned packaging box for reheatable food, the top cover is recessed in the middle to form a temporary storage groove, the lower vent is located in the temporary storage groove, the lower end of the leak-proof plug is inserted into the temporary storage groove, the outer side wall of the leak-proof plug is sealed to the groove wall of the temporary storage groove, the leak-proof plug is provided with an upper vent, and the upper vent and the lower vent are staggered.

[0014] During the delivery process, the hot air inside the middle box can enter the temporary storage tank through the lower vent and then exit through the upper vent on the leak-proof plug, achieving the effect of venting and preventing excessive internal pressure from separating the top cover from the middle box. This improves the stability of the connection between the middle box and the top cover. Simultaneously, when the packaging box is squeezed or vibrated, the soup enters the temporary storage tank through the lower vent. In most cases, the soup can flow back into the receiving cavity through the lower vent. Only when the squeezing is severe and a large amount of soup leaks out, some soup can flow out through the upper vent. This design reduces the probability and flow rate of soup leakage. The staggered arrangement of the upper and lower vents prevents soup from splashing directly into the upper vent after flowing through the lower vent and then flowing out, further reducing the occurrence of leakage.

[0015] Preferably, the temporary storage tank has an upwardly protruding protrusion in the middle, the leak-proof plug has a leak-proof groove and a liquid storage tank, the opening of the leak-proof groove faces downward, the upper part of the protrusion can extend into the leak-proof groove and there is a ventilation gap between the outer surface of the protrusion and the leak-proof groove, the lower side of the leak-proof plug and the bottom of the temporary storage tank also have a ventilation gap, and the upper vent is located at the bottom of the leak-proof groove; the liquid storage tank is annular and located outside the leak-proof groove, and the opening of the liquid storage tank faces upward.

[0016] In the above-mentioned packaging box for reheatable food, the edge of the top cover is bent to form an outer buckle, the edge of the middle box is bent to form an inner buckle, the inner buckle can be inserted into the outer buckle and the two are elastically deformed and engaged, the flange is formed on the outside of the inner buckle, and the upper part of the flange or the side wall of the bottom box is provided with an exhaust hole.

[0017] The top cover and inner box of this packaging box are sealed together using an elastic interlocking mechanism with outer and inner snap-fit ​​parts, ensuring a convenient and stable connection. The design of the outer and inner snap-fit ​​parts also enhances the structural strength of the outer edge of the top cover and the upper edge of the inner box, preventing deformation due to pressure during delivery or takeout and thus preventing leakage of soup. Vent holes are provided on the flared edge or the side wall of the bottom box to expel the heat and steam generated by the heating pack, preventing direct contact between the steam and the food inside the inner box, ensuring hygiene and preventing excessive pressure within the cavity formed by the bottom and inner boxes from causing the inner box to open.

[0018] In the above-mentioned food reheating box, a top cover boss is formed in the middle of the top cover. The lower ventilation hole and the leak-proof plug are arranged on the top cover boss. An annular top cover groove is formed by bending downward on the top cover inside the outer buckling part. A step part is arranged between the side wall of the middle box and the outer buckling part. The bottom of the top cover groove can abut against the step part.

[0019] Since the existing self-heating food boxes contain heating packs and prefabricated dishes or prefabricated hot pots and other foods in vacuum packaging, there is not much moisture, so the weight is very light, and there is no requirement for the structural strength of the self-heating food boxes; in the takeaway scenario, the food boxes may be placed at the bottom of the takeaway box, and heavier other takeaways may be stacked above the food boxes. Therefore, there are higher requirements for the structural strength of the self-heating food boxes, especially the structural strength in the vertical direction.

[0020] The cooperation of the above-mentioned top cover groove and the step part enables the middle box to have a better supporting effect on the top cover. Even if the same food boxes or other takeaway foods are stacked on the top cover, the top cover will not be severely concave and deformed, which is beneficial to improving the overall structural strength of the packaging box; the design of the top cover boss can also improve the structural strength of the top cover; further, the design of the top cover groove and the top cover boss makes the entire top cover in a multi-step shape, the higher the closer to the middle of the top cover, and the lower ventilation hole and the leak-proof plug are arranged on the top cover boss, which can more conveniently discharge the hot air in the accommodating cavity smoothly, avoiding being scalded by the water vapor generated when the hand is heated by the food when covering the lid. [[ID=​​​​​​​​​​The design of the four recessed sections in the middle box enhances the structural strength at the four corners. When food is inside the middle box, the outer wall of these recessed sections, along with the guide edge, clamps and fixes the reinforcing ribs of the bottom box between them, achieving horizontal positioning of the middle and bottom boxes. This prevents significant relative movement between the middle and bottom boxes, which could cause the middle box to tilt, thus enhancing the overall structural strength of the packaging box and reducing the possibility of leakage. The diagonally placed vents ensure even venting, preventing uneven heat buildup between the bottom and middle boxes and thus avoiding burns when lifting the middle box.

[0025] In the above-mentioned packaging box for reheating food, a baffle is provided at the vent to prevent gas from being discharged vertically upwards. The baffle is fixedly connected to the bottom, wall, or flange of the groove in the middle box. The edge of the top cover is formed with an easy-open part.

[0026] Preferably, the easy-open part is located above the groove of the middle box without a vent hole, and the design of the easy-open part can facilitate the separation of the top cover and the middle box.

[0027] With the baffle installed, the hot air and steam discharged from the exhaust port will first hit the baffle and then be discharged horizontally or diagonally upward, preferentially hitting the side wall of the groove in the middle box, thereby dispersing and cooling the steam.

[0028] In the above-mentioned packaging box for reheatable food, the edge of the middle box is provided with a middle box handle, and the upper edge of the bottom box is provided with a bottom box handle. The middle box handle and the bottom box handle are staggered, or the middle box handle wraps around the bottom box handle and the bottom box handle has a notch for fingers to pass through.

[0029] The bottom box handles facilitate moving the entire packaging box, while the middle box handles facilitate moving the middle box, making it easy to place or remove it from the bottom box. The staggered middle and bottom box handles ensure that the movement of the middle and bottom boxes does not interfere with each other, allowing users to grip the appropriate handle as needed. The middle box handles wrap around the bottom box handles, and the bottom box handles have notches for fingers to pass through, which enhances the structural strength of the handles. At the same time, the notches also prevent the bottom box handles from interfering with the movement of the middle box handles, resulting in a more compact structure and a more aesthetically pleasing design.

[0030] In the above-mentioned packaging box for reheatable food, an upwardly protruding central boss is formed in the middle of the bottom surface of the central box. The central boss is recessed downward to form several annular arc-shaped protrusions protruding from the lower side of the central boss. Multiple radial ventilation grooves are arranged circumferentially on the bottom surface of the central box between the central boss and the side wall of the central box. Multiple vertical ventilation grooves are arranged circumferentially on the outer peripheral wall of the central box. The vertical ventilation grooves and the radial ventilation grooves are staggered.

[0031] The aforementioned design of the raised section of the inner box creates an upwardly recessed area in the center of the bottom surface of the inner box. The hot air generated by the heating pack first gathers in this recessed area, then is evenly discharged outward through the radial ventilation channels into the space between the side walls of the inner and outer boxes. It then rises along the vertical ventilation channels to the top of the inner box and moves circumferentially along the inner wall of the reinforcing ribs, finally being discharged through the exhaust vent. Throughout this process, the food inside the inner box is heated more evenly. The radial and vertical ventilation channels do not allow all the hot air to move along them, but rather guide it, allowing most of the hot air to move along them, thus making the inner box relatively evenly heated overall. Furthermore, the design of the arc-shaped protrusion, radial ventilation channels, and vertical ventilation channels increases the heating area of ​​the inner box, improves heat utilization, and enhances the structural strength of the inner box. This makes the inner box less prone to deformation due to pressure or vibration during takeout and delivery, reducing the possibility of soup leakage. In particular, the vertical ventilation channels greatly enhance the vertical pressure resistance of the inner box, making this packaging box more suitable for takeout or delivery scenarios.

[0032] In the above-mentioned packaging box for reheatable food, the middle part of the bottom box protrudes upward to form a support part. The upper end of the support part abuts against or has a small gap with the arc-shaped protrusion of the middle box boss. The support part and the left and right side walls of the bottom box each have cavities for accommodating the heating pack. The support part and the front and rear side walls of the bottom box have gaps for gas to pass through.

[0033] The aforementioned support design not only supports the middle box, preventing it from denting and deforming due to excessive weight when filled with food, but also enhances the structural strength of the bottom box. Simultaneously, the arc-shaped protrusion on the lower side of the middle box's boss also works in conjunction with the support, creating a gap for hot air to pass through after the bottom of the middle box abuts against the support, ensuring that the area where the middle box and support meet is also heated, resulting in more even heating of the food inside the middle box.

[0034] Compared with the prior art, the technical effects of the present invention are as follows:

[0035] 1. In this invention, the edges of the top cover and the middle box are detachably sealed. The lower vent hole of the top cover is equipped with a leak-proof plug, which can prevent the soup of the food in the middle box from leaking during takeout or delivery as much as possible. At the same time, it can also isolate the gas generated when the heating pack is heating, preventing the gas from contacting the food, which is more hygienic and safe.

[0036] 2. In this invention, the middle box is placed inside the bottom box, which reduces the vertical height of the entire packaging box, making the structure more compact. This makes the packaging box take up less space during takeout or delivery, and also lowers the center of gravity of the packaging box when it contains food, making the packaging box less likely to tip over and reducing the possibility of soup leaking out due to the packaging box tipping over.

[0037] 3. The cavity height between the bottom of the middle box and the bottom box of the present invention is more compact, which further reduces the overall height of the packaging box while meeting the heating requirements, making the center of gravity of the entire packaging box lower and more stable. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0039] Figure 2 This is a cross-sectional view of the present invention. Figure 1 .

[0040] Figure 3 This is a cross-sectional view of the present invention. Figure 2 .

[0041] Figure 4 This is an exploded view of the present invention.

[0042] Figure 5 yes Figure 2 A magnified view of a portion of point A in the middle.

[0043] Figure 6 yes Figure 3 A magnified view of a section at point B.

[0044] Figure 7 yes Figure 3 A magnified view of a section at point C.

[0045] Figure 8 This is a partial magnification of the groove in the middle box of the present invention. Figure 1 .

[0046] Figure 9 This is a partial magnification of the groove in the middle box of the present invention. Figure 2 .

[0047] In the diagram, 1. Base box; 11. Reinforcing rib; 12. Base box handle; 121. Notch; 13. Support part; 2. Middle box; 21. Flanged edge; 211. Guide edge; 212. Middle box groove; 213. Vent hole; 214. Baffle; 22. Inner snap part; 23. Step part; 24. Middle box handle; 25. Middle box boss; 251. Arc-shaped protrusion; 26. Radial vent groove; 27. Vertical vent groove; 3. Top cover; 31. Lower vent; 32. Temporary storage groove; 321. Protrusion; 33. Outer snap part; 34. Top cover boss; 35. Top cover groove; 36. Easy-open part; 4. Leak-proof plug; 41. Upper vent; 42. Leak-proof groove; 43. Liquid storage tank. Detailed Implementation

[0048] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0049] The packaging box for reheating food includes a top cover 3, a bottom box 1 with an opening on the upper side, and a middle box 2. The middle box 2 is placed inside the bottom box 1. A cavity for accommodating the heating pack is provided between the lower side of the middle box 2 and the bottom of the bottom box 1. The upper part of the middle box 2 is formed with an outwardly protruding flange 21. The flange 21 is loosely fitted with the upper edge of the bottom box 1. The top cover 3 is detachably and sealed to the edge of the middle box 2. The top cover 3 and the middle box 2 together form a cavity for accommodating food. The top cover 3 is provided with a lower vent 31 that can connect the cavity to the outside. A leak-proof plug 4 is installed at the lower vent 31 to prevent soup leakage. The top cover 3 and the middle box 2 of this packaging box are detachably and sealed at their edges. The lower vent 31 of the top cover 3 is equipped with a leak-proof plug 4, which can minimize the leakage of soup from the food inside the middle box 2 during takeout or delivery. It can also isolate the gas generated by the heating pack during heating, preventing the gas from contacting the food, thus ensuring greater hygiene and safety. Placing the middle box 2 inside the bottom box 1 reduces the overall vertical height of the packaging box, making the structure more compact and taking up less space during takeout or delivery. It also lowers the center of gravity of the packaging box when filled with food, making it less prone to tipping over and reducing the risk of damage from packaging issues. The box may tip over, causing the soup to leak out. Furthermore, since this packaging box is mainly designed for takeout and delivery scenarios, the food in the middle box 2 is already cooked and retains residual heat or has not cooled down for long. Therefore, no additional water needs to be added when heating this packaging box. The heating pack only needs to ensure that the food in the middle box 2 is heated to a slightly hot temperature to restore its taste, without heating it to a complete boil. Therefore, the cavity height between the bottom of the middle box 2 and the bottom box 1 can be designed to be more compact as needed, further reducing the overall height of the packaging box while meeting heating requirements, making the center of gravity of the entire packaging box lower and more stable.

[0050] like Figure 1 and Figure 7As shown, the top cover 3 has a recessed middle section forming a temporary storage groove 32. A lower vent 31 is located within the temporary storage groove 32. The lower end of the leak-proof plug 4 is inserted into the temporary storage groove 32. The outer wall of the leak-proof plug 4 is sealed to the groove wall of the temporary storage groove 32. An upper vent 41 is provided on the leak-proof plug 4, and the upper vent 41 and the lower vent 31 are staggered. Preferably, the middle section of the temporary storage groove 32 has an upwardly protruding protrusion 321, and the leak-proof plug 4 has... The leak-proof groove 42 and the liquid storage groove 43 are provided. The opening of the leak-proof groove 42 faces downward. The upper part of the protrusion 321 can extend into the leak-proof groove 42 and there is a ventilation gap between the outer surface of the protrusion 321 and the leak-proof groove 42. The lower side of the leak-proof plug 4 also has a ventilation gap with the bottom of the temporary storage groove 32. The upper vent 41 is provided at the bottom of the leak-proof groove 42. The liquid storage groove 43 is annular and located outside the leak-proof groove 42. The opening of the liquid storage groove 43 faces upward. During delivery, hot air inside the middle box 2 can enter the temporary storage tank 32 through the lower vent 31, and then be discharged through the upper vent 41 on the leak-proof plug 4, achieving the effect of venting and preventing excessive internal pressure from separating the top cover 3 from the middle box 2. This helps improve the stability of the connection between the middle box 2 and the top cover 3. At the same time, when the packaging box is squeezed or shaken, the soup enters the temporary storage tank 32 through the lower vent 31. In most cases, the soup can flow back into the receiving cavity through the lower vent 31. Only when the compression is relatively large... When a large amount of soup leaks out, some of the soup can flow out through the upper vent 41. This design reduces the probability and flow rate of soup leakage. The staggered arrangement of the upper vent 41 and the lower vent 31 can prevent soup from splashing directly into the upper vent 41 and flowing out after flowing through the lower vent 31, further reducing the occurrence of leakage. Even if some soup is discharged from the upper vent 41, the design of the liquid storage tank 43 can be used to collect the leaked soup, preventing soup from flowing all over the top of the top cover 3, making it cleaner and more hygienic.

[0051] like Figure 2-6 As shown, the edge of the top cover 3 is bent to form an outer buckle 33, and the edge of the middle box 2 is bent to form an inner buckle 22. The inner buckle 22 can be inserted into the outer buckle 33 and the two are elastically deformed and locked together. The flange 21 is formed on the outside of the inner buckle 22. The flange 21 or the upper part of the side wall of the bottom box 1 is provided with an exhaust hole 213. In this packaging box, the top cover 3 and the middle box 2 are sealed together by an elastic snap-fit ​​of the outer buckle 33 and the inner buckle 22, which is convenient and stable. At the same time, the design of the outer buckle 33 and the inner buckle 22 can also enhance the structural strength of the outer edge of the top cover 3 and the upper edge of the middle box 2 to a certain extent, thereby preventing the soup from leaking out due to deformation caused by pressure during delivery or takeout. The vent 213 is provided on the flange 21 or the side wall of the bottom box 1, which can discharge the hot air and steam generated when the heating pack is heated, avoiding direct contact between the steam generated by the heating pack and the food in the middle box 2, which is cleaner and more hygienic. It can also prevent the middle box 2 from being pushed open due to excessive pressure in the cavity formed by the bottom box 1 and the middle box 2.

[0052] As Figure 3 and Figure 7 shown, a top cover boss 34 is formed in the middle of the top cover 3. The lower vent hole 31 and the leak-proof plug 四时设于顶盖凸台34上,外扣部33内侧的顶盖3上向下弯折成型有环形的顶盖凹槽35,中盒2的侧壁和外扣部33之间设置有台阶部23,顶盖凹槽35的底部能够与台阶部2抵靠。现有的自热食品盒由于内部放置的是加热包以及真空包装的预制菜或者预制火锅等食物,并没有过多的水份,因此重量很轻,对于自热食品盒的结构强度没有要求;而外卖场景下,餐盒可能放置在外卖箱的最下方,餐盒上方可能堆叠有较重的其他外卖,因此对自热食品盒的结构强度具有较高的要求,尤其是竖向上的结构强度。上述顶盖凹槽35和台阶部23配合,使中盒2对顶盖3能够具有更好s support for the top cover 3, so that even if the same packaging boxes or other takeaway foods are stacked on the top cover 3, the top cover 3 will not be severely concave and deformed, which is beneficial to improving the overall structural strength of the packaging box; the design of the top cover boss 34 can also improve the structural strength of the top cover 3; further, the design of the top cover groove 35 and the top cover boss 34 makes the entire top cover 3 in a multi-level stepped shape, the closer to the middle of the top cover 3, the higher it is, and the lower vent hole 四时 and the leak-proof plug 四时 are arranged on the top cover boss 34, which can more conveniently discharge the hot air in the accommodating cavity smoothly, avoiding being scalded by the water vapor generated when the hand is heated by the food when covering the lid.

[0053] As Figure 4 and Figure 6 shown, the outer edge of the flanging 21 is bent downward to form a guiding edge 211. The upper end of the bottom box 1 is bent to form a "ji" - shaped reinforcing rib 11. The lower side surface of the flanging 21 can abut against the upper side surface of the reinforcing rib 11, and the guiding edge 211 is located outside the reinforcing rib 11 and can wrap the middle and upper parts of the reinforcing rib 11. The reinforcing rib 11 on the bottom box 1 can enhance the structural strength of the bottom box 1, making the entire packaging box more adaptable to the use environments of takeaway and takeout; the design of the flanging 21 and the guiding edge 211 can make the middle box 2 have a certain sealing property when assembled with the bottom box 1. At the same time, since the flanging 21 and the guiding edge 211 are only placed on the reinforcing rib 11 and there is no snap connection, plug connection or tight fitting connection, the connection between the middle box 2 and the bottom box 1 is relatively loose, which is convenient for realizing the quick assembly and quick separation of the two, and is more convenient to use.

[0054] As Figure 1 、 Figure 2 and Figure 8 It should be noted that there seems to be some incorrect or incomplete expressions in the original text, such as "四时设于顶盖凸台34上" which is not clear. I have tried my best to translate it based on the overall context.As shown, both the middle box 2 and the bottom box 1 are rectangular. The flanges 21 at the four corners of the middle box 2 are recessed to form middle box grooves 212. The reinforcing ribs 11 can be inserted into the gap between the middle box grooves 212 and the guide edges 211. There are two vent holes 213, located in two diagonally opposite middle box grooves 212. The design of the above four middle box grooves 212 can enhance the structural strength of the four corners of the middle box 2. When food is contained in the middle box 2, the outer wall of the middle box groove 212 can also cooperate with the guide edges 211 to clamp and fix the reinforcing ribs 11 of the bottom box 1 between them, realizing the horizontal positioning of the middle box 2 and the bottom box 1, avoiding large relative movement between the middle box 2 and the bottom box 1, which would cause the middle box 2 to tilt, thereby enhancing the overall structural strength of the packaging box and reducing the possibility of soup leakage. The design of the diagonally located vent holes 213 can achieve uniform venting, avoiding uneven heat accumulation between the bottom box 1 and the middle box 2, thereby preventing burns when lifting the middle box 2.

[0055] As an alternative, such as Figure 9 As shown, a baffle 214 is provided at the exhaust port 213 to prevent gas from being discharged vertically upwards. The baffle 214 is fixedly connected to the bottom, wall, or flange 21 of the groove 212 of the middle box. The edge of the top cover 3 is formed with an easy-to-lift part 36. After the baffle 214 is provided, the hot air and steam discharged from the exhaust port 213 will first hit the baffle 214 and then be discharged in a horizontal or oblique upward direction, preferentially hitting the side wall of the groove 212 of the middle box, thereby dispersing and cooling the steam.

[0056] Preferably, the easy-open part 36 is located above the middle box recess 212 where the vent 213 is not provided. The design of the easy-open part 36 allows for easy separation of the top cover 3 and the middle box 2.

[0057] like Figure 4 and Figure 5 As shown, the middle box 2 has a middle box handle 24 on its edge, and the bottom box 1 has a bottom box handle 12 on its upper edge. The middle box handle 24 and the bottom box handle 12 are staggered, or the middle box handle 24 wraps around the bottom box handle 12 and the bottom box handle 12 has a notch 121 for fingers to pass through. The bottom box handle 12 is designed to facilitate moving the entire packaging box, while the middle box handle 24 is designed to facilitate moving the middle box 2, making it easy to place the middle box 2 into the bottom box 1 or to easily remove the middle box 2 from the bottom box 1. The staggered middle box handle 24 and bottom box handle 12 ensure that the movement of the middle box 2 and the bottom box 1 do not interfere with each other, allowing users to grasp the corresponding handle as needed. The middle box handle 24 wraps around the bottom box handle 12, and the bottom box handle 12 has a notch 121 for fingers to pass through, which enhances the structural strength of the handle. At the same time, the notch 121 also prevents the bottom box handle 12 from interfering with the movement of the middle box handle 24, resulting in a more compact structure and a more aesthetically pleasing design.

[0058] like Figure 1-4As shown, the middle of the bottom surface of the middle box 2 has an upwardly protruding middle box boss 25 formed in the middle. The middle box boss 25 is recessed downward to form several annular arc-shaped protrusions 251 protruding from the lower side of the middle box boss 25. Multiple radial ventilation grooves 26 are arranged circumferentially on the bottom surface of the middle box 2 between the middle box boss 25 and the side wall of the middle box 2. Multiple vertical ventilation grooves 27 are arranged circumferentially on the outer peripheral wall of the middle box 2. The vertical ventilation grooves 27 and the radial ventilation grooves 26 are staggered. The middle of the bottom box 1 protrudes upward to form a support part 13. The upper end of the support part 13 abuts against or has a small gap with the arc-shaped protrusions 251 of the middle box boss 25. The support part 13 and the left and right side walls of the bottom box 1 have cavities for accommodating the heating pack. The support part 13 and the front and rear side walls of the bottom box 1 have gaps for gas to pass through. The design of the aforementioned protrusion 25 in the middle box creates an upwardly recessed area in the center of the bottom surface of the middle box 2. The hot air generated by the heating pack first accumulates in this recessed area, then is evenly discharged outwards through the radial ventilation groove 26 into the space between the side walls of the bottom box 1 and the middle box 2. It then rises along the vertical ventilation groove 27 to the top of the bottom box 1 and moves circumferentially along the inner wall of the reinforcing rib 11, finally exiting through the exhaust hole 213. This process ensures more even heating of the food inside the middle box 2. However, the design of the radial ventilation groove 26 and the vertical ventilation groove 27 does not allow all the hot air to move along both. Instead, it serves as a guide, allowing most of the hot air to move along both sides, thus making the overall heating of the middle box 2 relatively uniform. Furthermore, the design of the arc-shaped protrusion 251, radial ventilation groove 26, and vertical ventilation groove 27 can increase the heating area of ​​the middle box 2, improve the heat utilization rate, and also enhance the structural strength of the middle box 2, making it less likely to be deformed by squeezing or vibration during takeout and delivery, reducing the possibility of soup leakage. In particular, the vertical ventilation groove 27 can greatly enhance the vertical pressure resistance of the middle box 2, making this packaging box more suitable for takeout or delivery usage scenarios. The design of the aforementioned support part 13 not only supports the middle box 2, preventing it from becoming too heavy and deformed after being filled with food, but also enhances the structural strength of the bottom box 1. At the same time, the arc-shaped protrusion 251 on the lower side of the middle box boss 25 of the middle box 2 can also cooperate with the support part 13. After the bottom surface of the middle box 2 abuts against the support part 13, a gap can be formed for the passage of hot air, so that the part where the middle box 2 abuts against the support part 13 can also be heated, making the food inside the middle box 2 heat more evenly.

[0059] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection defined by the claims of the present invention.

Claims

1. A packaging box capable of reheating food, comprising a top cover (3), a bottom box (1) with an opening on the upper side, and a middle box (2), characterized in that: The middle box (2) is placed inside the bottom box (1). A cavity for accommodating a heating packet is provided between the lower side surface of the middle box (2) and the bottom of the bottom box (1). An outwardly protruding turned edge (21) is formed on the upper part of the middle box (2). The turned edge (21) is loosely assembled with the upper edge of the bottom box (1). The top cover (3) is detachably and sealingly connected to the edge of the middle box (2). The top cover (3) and the middle box (2) enclose a receiving cavity for accommodating food. A lower ventilation hole (31) capable of connecting the receiving cavity and the outside is provided on the top cover (3). A leak-proof plug (4) for preventing soup from leaking is installed at the lower ventilation hole (31).

2. The packaging box for reheating food according to claim 1, characterized in that: A temporary storage groove (32) is formed by concave downward in the middle of the top cover (3). The lower ventilation hole (31) is provided in the temporary storage groove (32). The lower end of the leak-proof plug (4) is inserted into the temporary storage groove (32). The outer side wall of the leak-proof plug (4) is sealingly connected to the groove wall of the temporary storage groove (32). An upper ventilation hole (41) is provided on the leak-proof plug (4). The upper ventilation hole (41) and the lower ventilation hole (31) are arranged in a staggered manner.

3. A packaging box capable of reheating food according to claim 2, characterized in that: A convex block (321) protruding upward is provided in the middle of the temporary storage groove (32). A leak-proof groove (42) and a liquid storage groove (43) are provided on the leak-proof plug (4). The opening of the leak-proof groove (42) faces downward. The upper part of the convex block (321) can extend into the leak-proof groove (42) and there is a ventilation gap between the outer surface of the convex block (321) and the leak-proof groove (42). There is also a ventilation gap between the lower side surface of the leak-proof plug (4) and the groove bottom of the temporary storage groove (32). The upper ventilation hole (41) is provided at the groove bottom of the leak-proof groove (42). The liquid storage groove (43) is annular and located outside the leak-proof groove (42). The opening of the liquid storage groove (43) faces upward.

4. A packaging box capable of reheating food according to claim 1, characterized in that: The edge of the top cover (3) is bent to form an outer buckling part (33). The edge of the middle box (2) is bent to form an inner buckling part (22). The inner buckling part (22) can be inserted into the outer buckling part (33) and the two are elastically deformed and engaged with each other. The turned edge (21) is formed on the outside of the inner buckling part (22). An exhaust hole (213) is provided on the upper part of the turned edge (21) or the side wall of the bottom box (1).

5. A packaging box capable of reheating food according to claim 4, characterized in that: A top cover boss (34) is formed in the middle of the top cover (3). The lower ventilation hole (31) and the leak-proof plug (4) are provided on the top cover boss (34). An annular top cover groove (35) is formed by bending downward on the top cover (inside the outer buckling part (33)). A stepped part (23) is provided between the side wall of the middle box (2) and the outer buckling part (33). The bottom of the top cover groove (35) can abut against the stepped part (23).

6. A packaging box capable of reheating food according to claim 1, characterized in that: The outer edge of the turned edge (21) is bent downward to form a guiding edge (211). The upper end of the bottom box (1) is bent to form a "ji" - shaped reinforcing rib (11). The lower side surface of the turned edge (21) can abut against the upper side surface of the reinforcing rib (11). The guiding edge (211) is located outside the reinforcing rib (11) and can wrap the middle and upper parts of the reinforcing rib (11).

7. A packaging box capable of reheating food according to claim 6, characterized in that: Both the middle box (2) and the bottom box (1) are rectangular. The flanges (21) at the four corners of the middle box (2) are recessed to form middle box grooves (212). The reinforcing ribs (11) can be inserted into the gap between the middle box grooves (212) and the guide edge (211). There are two exhaust holes (213) located in the two diagonally opposite middle box grooves (212).

8. A packaging box capable of reheating food according to claim 7, characterized in that: The exhaust port (213) is provided with a baffle (214) to prevent gas from being discharged vertically upward. The baffle (214) is fixedly connected to the bottom or wall or flange (21) of the groove (212) of the middle box. The edge of the top cover (3) is formed with an easy-to-lift part (36).

9. A packaging box capable of reheating food according to any one of claims 1-8, characterized in that: The middle box (2) has a middle box handle (24) on its edge, and the bottom box (1) has a bottom box handle (12) at its upper edge. The middle box handle (24) and the bottom box handle (12) are staggered, or the middle box handle (24) wraps around the bottom box handle (12) and the bottom box handle (12) has a notch (121) for fingers to pass through.

10. A packaging box capable of reheating food according to any one of claims 1-8, characterized in that: The bottom surface of the middle box (2) is formed with an upwardly protruding middle box boss (25). The middle box boss (25) is recessed downward to form several annular arc-shaped protrusions (251) protruding from the lower side of the middle box boss (25). Multiple radial ventilation grooves (26) are arranged circumferentially on the bottom surface of the middle box (2) between the middle box boss (25) and the side wall of the middle box (2). Multiple vertical ventilation grooves (27) are arranged circumferentially on the outer peripheral wall of the middle box (2). The vertical ventilation grooves (27) and the radial ventilation grooves (26) are staggered.

11. A packaging box capable of reheating food according to claim 10, characterized in that: The middle part of the bottom box (1) protrudes upward to form a support part (13). The upper end of the support part (13) abuts against or has a small gap with the arc-shaped protrusion (251) of the middle box boss (25). The support part (13) and the left and right walls of the bottom box (1) have cavities for accommodating the heating pack. The support part (13) and the front and rear side walls of the bottom box (1) have gaps for gas to pass through.

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