Self-heating meal box

Abstract

The utility model discloses a self-heating lunch box, which comprises a box body, a heating cavity, a food cavity, a heating cover and a heating cover, the box body is provided with a heating cavity and a food cavity which are independent from each other, a self-heating bag is arranged in the heating cavity, and the food cavity is positioned above the heating cavity; the cover body is arranged on the box body in a covering mode, and air holes are formed in the cover body; the pressure relief structure is arranged on the side wall of the heating cavity, the pressure relief structure is provided with a pressing rod extending into the heating cavity, and the pressing rod is located above the self-heating bag and abuts against the self-heating bag; wherein a pressure relief hole is formed in the side wall of the heating cavity, the pressure relief structure blocks the pressure relief hole, and when the self-heating bag expands, the pressing rod can move upwards and drive the pressure relief structure to open the pressure relief hole. In this way, the self-heating bag can be fixed, pressure can be relieved through the pressure relief holes when the pressure in the box body is too large, and the safety performance of the self-heating meal box can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tableware, in particular to a self-heating lunch box. Background Art

[0002] At present, self-heating foods have appeared in large quantities, such as self-heating rice, self-heating hot pot, etc. Existing self-heating foods are usually heated by putting food into a self-heating lunch box. Specifically, the self-heating lunch box generally includes a heating chamber and a food chamber. The food chamber is located above the heating chamber and is connected to the heating chamber. A self-heating bag is placed in the heating chamber. A proper amount of water is added to the heating chamber, and food is placed in the food chamber, and then the lid is closed. The self-heating bag generates heat when it meets water and forms high-temperature steam, thereby heating the food in the inner box.

[0003] During the heating process, the generation of a large amount of high-temperature water vapor will cause the air pressure in the lunch box to increase. For this reason, a vent is usually set on the cover so that the high-temperature steam can flow from bottom to top and be discharged from the vent on the cover. However, since the self-heating bag will expand itself during the heat generation process, it will further cause the gas pressure in the lunch box to increase. The vent is usually small. If the air pressure in the lunch box is too high, the high-temperature steam cannot be discharged in time only through the vent, which may cause the cover to separate upward from the lunch box under the action of steam, which is not only not conducive to the heating of food, but also causes a large amount of steam to flow out and cause harm to the user. In addition, since the self-heating bag will expand itself when it is heated, causing the volume to increase, the volume of the heating chamber is usually larger than that of the self-heating bag. However, in the packaging process of the existing self-heating lunch box, the self-heating bag is usually placed directly in the heating chamber and the food bag is placed in the inner box. During transportation, the self-heating bag is easy to collide with the inner wall of the heating chamber, and in severe cases, it may even cause the self-heating bag to be damaged. If the internal substances of the self-heating bag are mixed into the food, it will cause serious health problems to the user. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a self-heating lunch box, which can not only fix and protect the self-heating bag, but also can release pressure in time during heating, and has high safety.

[0005] According to the embodiment of the utility model, the self-heating lunch box includes: a box body, having a heating chamber and a food chamber that are independent of each other, a self-heating bag being arranged in the heating chamber, the food chamber being located above the heating chamber, and a steam passage connecting the heating chamber and the food chamber being also arranged in the box body; a cover body, which is arranged on the box body, and a vent hole is provided on the cover body; a pressure relief structure, which is arranged on the side wall of the heating chamber, and the pressure relief structure is provided with a pressure rod extending into the interior of the heating chamber, the pressure rod is located above the self-heating bag and presses against the self-heating bag; wherein, the side wall of the heating chamber is provided with a pressure relief hole, the pressure relief structure blocks the pressure relief hole, and when the self-heating bag expands, the pressure rod can move upward and drive the pressure relief structure to open the pressure relief hole.

[0006] The self-heating lunch box according to the embodiment of the utility model has at least the following beneficial effects:

[0007] By adopting the self-heating lunch box of the embodiment of the utility model, a pressure relief structure is provided in the heating chamber, and the pressure relief structure is provided with a pressure rod extending into the interior of the heating chamber, and the pressure rod is used to press the self-heating bag from top to bottom, thereby fixing the self-heating bag, and further reducing the risk of the self-heating bag being displaced during transportation and colliding with the inner wall of the heating chamber, thereby protecting the self-heating bag to a certain extent. In addition, during the use of the self-heating lunch box of the embodiment of the utility model, since the pressure rod is pressed against the top of the self-heating bag, the self-heating bag will expand when it is heated, so that the pressure rod can move upward and drive the pressure relief structure to open the pressure relief hole, and the pressure can be relieved through the pressure relief hole at this time, thereby further reducing the risk of the cover body being separated from the box body due to excessive air pressure, which is conducive to improving the safety performance of the self-heating lunch box.

[0008] According to some embodiments of the utility model, the pressure relief structure includes a sealing piece, which is located on the outside of the heating chamber and seals the pressure relief hole, the lower end of the sealing piece is rotatably connected to the outer wall of the box body, the pressure rod passes through the pressure relief hole and is connected to the sealing piece, or the sealing piece is partially passed through the pressure relief hole and connected to the pressure rod, and when the self-heating bag expands, the pressure rod can move upward and push the sealing piece to rotate outward to open the pressure relief hole.

[0009] According to some embodiments of the utility model, a sealing portion is provided on the inner wall of the sealing member, the sealing portion is inserted into the outer end of the pressure relief hole and is interference fit with the peripheral wall of the pressure relief hole, the pressure rod is passed through the inner end of the pressure relief hole and is gap fit with the peripheral wall of the pressure relief hole, the pressure rod is connected to the sealing portion and can push the sealing portion out of the pressure relief hole.

[0010] According to some embodiments of the utility model, one of the outer wall of the box body and the inner wall of the sealing member is provided with a recessed portion, and the other is provided with a raised portion embedded in the recessed portion. When the self-heating bag expands, the pressure rod can move upward and cause the raised portion to disengage from the recessed portion.

[0011] According to some embodiments of the present utility model, the lower end of the blocking member is rotatably connected to the outer side wall of the box body via a flexible member.

[0012] According to some embodiments of the present invention, the blocking member and the pressure rod are an integrated structure.

[0013] According to some embodiments of the utility model, the pressure rod is provided with a clamping groove, and the packaging bag portion of the self-heating bag is clamped in the clamping groove.

[0014] According to some embodiments of the utility model, a sliding groove is provided on the upper edge of the box body, and the cover body can be inserted into the sliding groove and close the opening of the box body; at least one clamping component is also provided between the cover body and the box body, and the clamping component includes a first clamping part and a second clamping part that can be clamped to each other, the first clamping part is provided on the cover body, and the second clamping part is provided on the box body; when the cover body is inserted into the sliding groove, the first clamping part can be clamped to each other with the corresponding second clamping part.

[0015] According to some embodiments of the utility model, the front edge and the rear edge of the box body are arranged parallel to each other, the slide groove includes a first slide groove provided at the front edge, a second slide groove provided at the rear edge, and a third slide groove provided at the left edge of the box body, and both ends of the third slide groove are correspondingly connected to the first slide groove and the second slide groove; the first clamping portion is provided at the right end of the cover body, and the second clamping portion is provided at the right edge of the box body.

[0016] According to some embodiments of the utility model, the box body includes an outer box and an inner box, the inner box is arranged in the outer box, the inner box has a food cavity, and the outer box has a heating cavity located at the bottom of the inner box; the inner wall of the outer box has a supporting portion protruding inward, the periphery of the inner box overlaps the supporting portion, the outer peripheral wall of the inner box is provided with at least one groove recessed toward the food cavity, the steam channel is formed by the inner wall of the groove and the inner wall of the outer box, and the upper end periphery of the groove is provided with a hand-held portion extending to block part of the steam channel.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 A schematic diagram of a self-heating lunch box according to an embodiment of the present invention;

[0020] Figure 2 This is an exploded schematic diagram of a self-heating lunch box according to an embodiment of the present invention;

[0021] Figure 3 It is a cross-sectional schematic diagram of a self-heating lunch box according to another embodiment of the utility model;

[0022] Figure 4 for Figure 3 A local enlarged schematic diagram of the middle A;

[0023] Figure 5 for Figure 3 A partial enlarged schematic diagram of the pressure relief hole at B in the middle when it is closed;

[0024] Figure 6 for Figure 3 A partial enlarged schematic diagram of the pressure relief hole at B in the middle when it is opened;

[0025] Figure 7 The figure is a schematic diagram of a pressure rod of a self-heating lunch box according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Box body 100, outer box 101, inner box 102, hand-held part 103, heating chamber 110, food chamber 120, steam channel 130, pressure relief hole 140, slide groove 150, cover body 200, air hole 210, pressure relief structure 300, pressure rod 310, clamping groove 311, blocking member 320, flexible member 400. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Reference Figures 1 to 7 In one embodiment of the utility model, a self-heating lunch box is provided, comprising a box body 100, a cover body 200 and a pressure relief structure 300. The box body 100 has a heating chamber 110 and a food chamber 120 which are independent of each other. A self-heating bag (not shown) is arranged in the heating chamber 110. The food chamber 120 is located above the heating chamber 110. A steam passage 130 connecting the heating chamber 110 and the food chamber 120 is also arranged in the box body 100. The cover body 200 is covered on the box body 100, and a vent hole 210 is opened on the cover body 200. The pressure relief structure 300 is arranged on the side wall of the heating chamber 110. The pressure relief structure 300 is provided with a pressure rod 310 extending into the interior of the heating chamber 110. The pressure rod 310 is located above the self-heating bag and presses against the self-heating bag. Among them, a pressure relief hole 140 is opened on the side wall of the heating chamber 110, and the pressure relief structure 300 blocks the pressure relief hole 140. When the self-heating bag expands, the pressure rod 310 can move upward and drive the pressure relief structure 300 to open the pressure relief hole 140.

[0033] By adopting the self-heating lunch box of the embodiment of the utility model, a pressure relief structure 300 is provided in the heating chamber 110, and the pressure relief structure 300 is provided with a pressure rod 310 extending into the interior of the heating chamber 110. The pressure rod 310 presses the self-heating bag from top to bottom, thereby fixing the self-heating bag, and further reducing the risk of the self-heating bag being displaced during transportation and colliding with the inner wall of the heating chamber 110, thereby providing a certain protection for the self-heating bag. In addition, during the use of the self-heating lunch box of the embodiment of the utility model, when water is added into the heating chamber 110, the self-heating bag will generate heat when it meets the water and make the water form high-temperature steam. In this process, the high-temperature steam can flow to the food chamber 120 through the steam channel 130 to heat the food, and can flow out from the air vents 210 of the cover body 200, thereby reducing the cover body 200 from separating from the box body 100 due to the increase of air pressure in the box body 100. In addition, since the pressure rod 310 is pressed on the top of the self-heating bag, the self-heating bag will expand when it is heated. , so that the pressure rod 310 can move upward and drive the pressure relief structure 300 to open the pressure relief hole 140, that is, when the pressure rod 310 moves upward with the self-heating bag to a preset height, it means that the air pressure in the box body 100 is too high at this time. At this time, the pressure rod 310 can drive the pressure relief structure 300 to open the pressure relief hole 140, and the pressure is relieved through the pressure relief hole 140, thereby further reducing the risk of the cover body 200 detaching from the box body 100 due to excessive air pressure, which is beneficial to improving the safety performance of the self-heating lunch box and avoiding a large amount of steam from flowing out quickly due to the detachment of the cover body 200 and scalding the user.

[0034] Reference Figures 1 to 7 In some embodiments, the pressure relief structure 300 includes a sealing piece 320, which is located on the outside of the heating chamber 110 and blocks the pressure relief hole 140. The lower end of the sealing piece 320 is rotatably connected to the outer wall of the box body 100. The sealing piece 320 is partially penetrated through the pressure relief hole 140 and connected to the pressure rod 310. When the self-heating bag expands, the pressure rod 310 can move upward and push the sealing piece 320 to rotate outward to open the pressure relief hole 140.

[0035] By adopting the above structure, during use, the sealing member 320 can seal the pressure relief hole 140, and when the self-heating bag expands, it can drive the pressure rod 310 to move upward. At this time, since the pressure rod 310 is connected to the sealing member 320, the pressure rod 310 can push the sealing member 320 to rotate outward when moving upward, thereby opening the pressure relief hole 140, so that pressure can be relieved through the pressure relief hole 140. The structure is simple and has high safety. In addition, as the self-heating bag expands and causes the pressure rod 310 to move upward a gradually increasing distance, the pressure rod 310 pushes the sealing member 320 to rotate outward a gradually increasing distance, so that the opening of the pressure relief hole 140 gradually increases. As a result, the opening of the pressure relief hole 140 can be gradually increased as the air pressure inside the box body 100 increases, so that the opening of the pressure relief hole 140 can be adjusted as the air pressure inside the box body 100 changes. Therefore, the air pressure inside the box body 200 can be flexibly controlled, thereby effectively improving the safety performance of the self-heating lunch box and reducing the risk of the cover body 200 detaching from the box body 100 due to excessive air pressure.

[0036] It is understandable that the blocking member 320 is partially disposed in the pressure relief hole 140 and connected to the pressure rod 310, which is only for Figures 1 to 7 As an exemplary illustration, in some embodiments, the pressure rod 310 can also be inserted into the pressure relief hole 140 and connected to the blocking member 320. When the self-heating bag expands, the pressure rod 310 can be driven to move upward. At this time, the pressure rod 310 can also push the blocking member 320 to rotate outward to open the pressure relief hole 140, so that pressure can be relieved through the pressure relief hole 140. The structure is simple and has high safety. The positional relationship between the pressure rod 310 and the blocking member 320 is not specifically limited in the present invention.

[0037] In some embodiments, a sealing portion is provided on the inner wall of the blocking member 320, which is inserted into the outer end of the pressure relief hole 140 and has an interference fit with the peripheral wall of the pressure relief hole 140, and a pressure rod 310 is passed through the inner end of the pressure relief hole 140 and has a gap fit with the peripheral wall of the pressure relief hole 140, and the pressure rod 310 is connected to the sealing portion and can push the sealing portion out of the pressure relief hole 140.

[0038] By adopting the above structure, the sealing part is inserted into the outer end of the pressure relief hole 140 and is interference fit with the peripheral wall of the pressure relief hole 140, thereby preventing steam from leaking from the pressure relief hole 140 when the steam pressure inside the box body 100 is relatively low, which is conducive to better heating the food in the food cavity 120. When the air pressure in the box body 100 is too high, the pressure rod 310 moves upward with the self-heating bag and pushes the sealing part outward from the pressure relief hole 140, thereby allowing pressure to be relieved through the pressure relief hole 140. The structure is simple and has high safety.

[0039] In some embodiments, the outer wall of the box body 100 is provided with a recessed portion, and the inner wall of the sealing member 320 is provided with a raised portion embedded in the recessed portion. When the self-heating bag expands, the pressure rod 310 can move upward and cause the raised portion to separate from the recessed portion.

[0040] By adopting the above structure, the cooperation between the concave part and the convex part can fix the blocking member 320, so that the connection between the blocking member 320 and the box body 100 is more stable. When the self-heating bag expands, it can drive the pressure rod 310 to move upward. In this process, the pressure rod 310 can apply an outward thrust to the blocking member 320. When the thrust of the pressure rod 310 on the blocking member 320 is greater than the friction between the concave part and the convex part, the convex part of the inner wall of the blocking member 320 will be separated from the concave part. At this time, the pressure rod 310 can push the blocking member 320 to rotate outward to open the pressure relief hole 140, so that pressure can be relieved through the pressure relief hole 140. The structure is simple and has high safety.

[0041] It can be understood that the outer wall of the box body 100 is provided with a recessed portion, and the inner wall of the sealing member 320 is provided with a raised portion embedded in the recessed portion. This is merely an exemplary description of the present invention. In some embodiments, a recessed portion may be provided on the inner wall of the sealing member 320, and a raised portion embedded in the recessed portion may be provided on the outer wall of the box body 100. The present invention does not make any specific limitation on this. It is only required that one of the outer wall of the box body 100 and the inner wall of the sealing member 320 is provided with a recessed portion, and the other is provided with a raised portion embedded in the recessed portion.

[0042] Reference Figures 1 to 7 In some embodiments, the lower end of the blocking member 320 is rotatably connected to the outer wall of the box body 100 via a flexible member 400 .

[0043] By adopting the above structure, when the blocking member 320 is pushed outward by the pressure rod 310, the flexible member 400 can be deformed and the blocking member 320 can be rotated outward to open the pressure relief hole 140, and the structure is simple.

[0044] It is understandable that the flexible member 400 may be made of flexible plastic, rubber, etc., and the present invention does not make any specific limitation on this.

[0045] It is understandable that, for the rotational connection between the blocking member 320 and the box body 100, in addition to using the flexible member 400, in some embodiments, a rotating shaft may also be provided between the blocking member 320 and the box body 100, and the present invention does not make any specific limitation on this.

[0046] Reference Figures 1 to 7 The blocking member 320 and the pressure rod 310 are an integrated structure.

[0047] By adopting the above structure, the blocking member 320 and the pressure rod 310 are integrated into one structure, which can make the production of the pressure relief structure 300 simpler and more convenient.

[0048] Reference Figures 1 to 7 In some embodiments, the pressure rod 310 is provided with a clamping groove 311 , and the packaging bag portion of the self-heating bag is clamped in the clamping groove 311 .

[0049] By adopting the above structure, the packaging bag part of the self-heating bag is clamped in the clamping groove 311 of the pressure rod 310, so that the self-heating bag can be fixed more stably, and the risk of the self-heating bag being displaced during transportation and colliding with the inner wall of the heating chamber 110 and causing damage to the self-heating bag is further reduced, thereby better protecting the self-heating bag.

[0050] Reference Figure 3 and Figure 4 In some embodiments, a slide groove 150 is provided on the upper edge of the box body 100, and the cover body 200 can be inserted into the slide groove 150 and close the opening of the box body 100; at least one clamping component (not shown in the figure) is also provided between the cover body 200 and the box body 100, and the clamping component includes a first clamping portion and a second clamping portion that can be clamped to each other, the first clamping portion is provided on the cover body 200, and the second clamping portion is provided on the box body 100; when the cover body 200 is inserted into the slide groove 150, the first clamping portion can be clamped to each other with the corresponding second clamping portion.

[0051] By adopting the above structure, when in use, the cover body 200 is first horizontally inserted into the slide groove 150 of the box body 100, and then fixed by the snap-fit ​​assembly to make the connection between the cover body 200 and the box body 100 tighter. When opening the cover body 200, it is only necessary to separate the first snap-fit ​​part from the second snap-fit ​​part first, and then move the cover body 200 horizontally out of the slide groove 150 of the box body 100. This not only prevents the cover body 200 from upwardly separating from the box body 100 under the action of high-pressure steam, but also prevents the liquid on the cover body 200 from splashing onto the user when the user opens the cover body 200, thereby having higher safety.

[0052] It can be understood that the first clamping part is provided on the cover 200, and the second clamping part is provided on the box body 100. Specifically, in some embodiments, the second clamping part is rotatably mounted on the box body 100, and the first clamping part is located on the upper surface of the cover 200. When the cover 200 is inserted into the slide groove 150 of the box body 100, the second clamping part can be rotated upward and snap-fitted with the first clamping part on the upper surface of the cover 200. Of course, in addition to setting the first clamping part and the second clamping part as the above structure, the first clamping part and the second clamping part can also be set as other forms of clamping structures, such as a structure of a hook and a slot, etc., which is not specifically limited by the present invention.

[0053] It is understandable that in order to further prevent steam from leaking from the gap between the cover 200 and the box body 100 , the cross section of the slide groove 150 can be set to an S shape, and the edge of the cover 200 can be set to a shape that matches the cross section of the slide groove 150 .

[0054] Reference Figure 3 and Figure 4 In some embodiments, the front edge and the rear edge of the box body 100 are arranged parallel to each other, and the slide groove 150 includes a first slide groove arranged at the front edge, a second slide groove arranged at the rear edge, and a third slide groove arranged at the left edge of the box body 100, and both ends of the third slide groove are correspondingly connected to the first slide groove and the second slide groove; the first clamping portion is arranged at the right end of the cover body 200, and the second clamping portion is arranged at the right edge of the box body 100.

[0055] By adopting the above structure, when in use, the cover body 200 can be first inserted horizontally into the first slide groove and the second slide groove from right to left until the left end of the cover body 200 is inserted into the third slide groove at the left edge of the box body 100, and then fixed by the clamping assembly at the right end to make the connection between the cover body 200 and the box body 100 tighter. When opening the cover body 200, it is only necessary to separate the first clamping part from the second clamping part first, and then move the cover body 200 horizontally out of the slide groove 150 of the box body 100. This can not only prevent the cover body 200 from upwardly separating from the box body 100 under the action of high-pressure steam, but also prevent the user from splashing the liquid on the cover body 200 onto the user when opening the cover body 200, thereby having higher safety.

[0056] Reference Figures 1 to 3 In some embodiments, the box body 100 includes an outer box 101 and an inner box 102, the inner box 102 is arranged in the outer box 101, the inner box 102 has a food cavity 120, and the outer box 101 has a heating cavity 110 located at the bottom of the inner box 102; the inner wall of the outer box 101 has a supporting portion protruding inward, the periphery of the inner box 102 is overlapped with the supporting portion, the outer peripheral wall of the inner box 102 is provided with at least one groove recessed toward the food cavity 120, the steam channel 130 is formed by the inner wall of the groove and the inner wall of the outer box 101, and the upper end periphery of the groove is provided with a hand-held portion 103 extending to block part of the steam channel 130.

[0057] By adopting the above structure, when using, food can be placed in the food cavity 120 of the inner box 102, and the inner box 102 can be placed in the outer box 101. When water is added to the heating cavity 110, the self-heating bag will generate heat when it meets water and make the water form high-temperature steam. The high-temperature steam can flow upward to the food cavity 120 through the steam channel 130 to heat the food. By providing a hand-held portion 103 extending to block part of the steam channel 130 at the upper end periphery of the groove, it is convenient for the user to take the inner box 102 out of the outer box 101 or put the inner box 102 into the outer box 101. The structure is simple and convenient for users to use.

[0058] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A self-heating lunch box, characterized in that: include: A box body (100) having a heating chamber (110) and a food chamber (120) which are independent of each other, wherein a self-heating bag is provided in the heating chamber (110), and the food chamber (120) is located above the heating chamber (110); and a steam passage (130) which communicates the heating chamber (110) with the food chamber (120) is also provided in the box body (100); A cover body (200) is disposed on the box body (100), and a vent hole (210) is provided on the cover body (200); a pressure relief structure (300) disposed on a side wall of the heating chamber (110), the pressure relief structure (300) being provided with a pressure rod (310) extending into the interior of the heating chamber (110), the pressure rod (310) being located above the self-heating bag and pressing against the self-heating bag; A pressure relief hole (140) is provided on the side wall of the heating chamber (110), and the pressure relief structure (300) blocks the pressure relief hole (140); when the self-heating bag expands, the pressure rod (310) can move upward and drive the pressure relief structure (300) to open the pressure relief hole (140).

2. The self-heating lunch box according to claim 1, characterized in that: The pressure relief structure (300) comprises a blocking piece (320), the blocking piece (320) being located outside the heating chamber (110) and blocking the pressure relief hole (140), the lower end of the blocking piece (320) being rotatably connected to the outer side wall of the box body (100), The pressure rod (310) is disposed through the pressure relief hole (140) and is connected to the blocking member (320), or the blocking member (320) is partially disposed through the pressure relief hole (140) and is connected to the pressure rod (310). When the self-heating bag expands, the pressure rod (310) can move upward and push the blocking member (320) to rotate outward to open the pressure relief hole (140).

3. The self-heating lunch box according to claim 2, characterized in that: The inner wall of the sealing member (320) is provided with a sealing portion, which is inserted into the outer end of the pressure relief hole (140) and is interference fit with the peripheral wall of the pressure relief hole (140), and the pressure rod (310) is passed through the inner end of the pressure relief hole (140) and is gap fit with the peripheral wall of the pressure relief hole (140), and the pressure rod (310) is connected to the sealing portion and can push the sealing portion to detach from the pressure relief hole (140).

4. The self-heating lunch box according to claim 2, characterized in that: One of the outer wall of the box body (100) and the inner wall of the sealing member (320) is provided with a recessed portion, and the other is provided with a raised portion embedded in the recessed portion, and when the self-heating bag expands, the pressure rod (310) can move upwards and cause the raised portion to separate from the recessed portion.

5. The self-heating lunch box according to claim 2, characterized in that: The lower end of the blocking member (320) is rotatably connected to the outer side wall of the box body (100) via a flexible member (400).

6. The self-heating lunch box according to any one of claims 2 to 5, characterized in that: The blocking member (320) and the pressure rod (310) are an integrated structure.

7. The self-heating lunch box according to claim 1, characterized in that: The pressure rod (310) is provided with a clamping groove (311), and the packaging bag portion of the self-heating bag is clamped in the clamping groove (311).

8. The self-heating lunch box according to claim 1, characterized in that: A sliding groove (150) is provided on the upper peripheral edge of the box body (100), and the cover body (200) can be inserted into the sliding groove (150) and close the opening of the box body (100); At least one clamping assembly is further provided between the cover body (200) and the box body (100), the clamping assembly comprising a first clamping portion and a second clamping portion capable of being clamped to each other, the first clamping portion being provided on the cover body (200) and the second clamping portion being provided on the box body (100); When the cover body (200) is inserted into the slide groove (150), the first clamping portion can be clamped with the corresponding second clamping portion.

9. The self-heating lunch box according to claim 8, characterized in that: The front edge and the rear edge of the box body (100) are arranged parallel to each other, the slide groove (150) comprises a first slide groove provided at the front edge, a second slide groove provided at the rear edge, and a third slide groove provided at the left edge of the box body (100), and two ends of the third slide groove are correspondingly connected to the first slide groove and the second slide groove; The first clamping portion is arranged at the right end of the cover body (200), and the second clamping portion is arranged at the right edge of the box body (100).

10. The self-heating lunch box according to claim 1, characterized in that: The box body (100) comprises an outer box (101) and an inner box (102), wherein the inner box (102) is arranged inside the outer box (101), the inner box (102) has a food cavity (120), and the outer box (101) has a heating cavity (110) located at the bottom of the inner box (102); The inner wall of the outer box (101) has a support portion protruding inwardly, the periphery of the inner box (102) overlaps the support portion, the outer peripheral wall of the inner box (102) is provided with at least one groove recessed toward the food cavity (120), the steam passage (130) is formed by the inner wall of the groove and the inner wall of the outer box (101) being mutually enclosed, and the upper periphery of the groove is provided with a hand-held portion (103) extending to block a portion of the steam passage (130).

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