Self-venting lid structure and lunch box

Abstract

This utility model discloses a self-venting cover structure and a lunchbox, relating to the field of containers. The self-venting cover structure includes: an outer cover, an inner cover, and a pressure regulating component. The outer cover has a vent hole; the inner cover is connected to the outer cover and has a return vent hole. An air cavity is defined between the outer cover and the inner cover, connecting the return vent hole and the vent hole; the pressure regulating component is disposed in the air cavity and includes an elastic element and a sealing element. The sealing element is connected to the outer cover and can slide towards or away from the inner cover. The elastic element is disposed between the outer cover and the sealing element to push the sealing element so that the end of the sealing element abuts against and seals the return vent hole. The outer cover can move towards or away from the inner cover. When the outer cover moves away from the inner cover, it can drive the sealing element to move, so that the sealing element separates from the return vent hole. The self-venting cover structure provided by this utility model can automatically or manually adjust the air pressure inside and outside the lunchbox, effectively solving many problems caused by pressure differences in existing lunchboxes and significantly improving the user experience.

Description

Technical Field

[0001] This utility model relates to the field of containers, and in particular to a self-venting lid structure and a lunch box. Background Technology

[0002] Currently, lunchboxes on the market often experience pressure differences between the inside and outside atmosphere due to temperature changes in the contents. This pressure difference manifests in two ways: when positive pressure forms inside, opening the lunchbox can easily cause the contents to splash out, and the lid may also be blown off, potentially injuring the user and posing a safety hazard; conversely, when negative pressure forms inside, the lid is strongly attracted by the outside atmosphere, becoming difficult to open, causing great inconvenience to the user and severely impacting the user experience of the insulated lunchbox. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a self-venting lid structure, which can effectively solve many problems caused by pressure differences in existing lunch boxes.

[0004] The self-venting cover structure provided according to the embodiments of this utility model includes:

[0005] The outer cover has ventilation holes;

[0006] The inner cover is provided with a vent hole, and the inner cover is movably connected to the outer cover so as to define an air cavity that communicates with the vent hole and the air passage.

[0007] A pressure regulating component is disposed within the air chamber. The pressure regulating component includes an elastic element and a sealing element. The sealing element is connected to the outer cover and can move toward or away from the inner cover. The elastic element is disposed between the outer cover and the sealing element to push the sealing element so that the end of the sealing element abuts against and seals the return air hole.

[0008] The outer cover can move toward or away from the inner cover. When the outer cover moves away from the inner cover, it can drive the sealing element to move so that the sealing element separates from the vent hole.

[0009] According to the self-venting cover structure provided in the embodiment of this utility model, the outer cover is provided with a connector extending toward the inner cover, the sealing member includes a connecting part and a sealing part, the connecting part is connected to the connector and can slide toward or away from the inner cover, the elastic member is provided on the connector and its two ends abut against the outer cover and the connecting part respectively, so that the sealing part abuts against and seals the return air hole.

[0010] According to the self-venting cover structure provided in the embodiment of this utility model, the connecting member is cylindrical and has a sliding channel facing the opening of the inner cover. The inner wall of the sliding channel is provided with a limiting groove, which extends along the axial direction of the sliding channel. The connecting part is rod-shaped and has a limiting block on its outer periphery. The connecting part slides in the sliding channel, and the limiting block slides in the limiting groove.

[0011] According to the self-venting cover structure provided in the embodiment of this utility model, the outer wall of the connector is provided with a deformation relief groove that penetrates the sliding channel, and the deformation relief groove is misaligned with the limiting groove along the circumference of the connector.

[0012] According to the self-venting cover structure provided in the embodiment of this utility model, the elastic element is a spring, the outer periphery of the connecting part is provided with an abutting part, the spring is sleeved on the connecting element and its end abuts against the abutting part.

[0013] According to the self-venting cover structure provided in this embodiment of the utility model, the inner cover is detachably connected to the outer cover.

[0014] According to the self-venting cover structure provided in the embodiment of this utility model, the outer cover is provided with a sliding sleeve extending toward the inner cover, the inner wall of the sliding sleeve near one end of the inner cover is provided with a first retaining rib, the inner cover is provided with a sliding cylinder extending toward the outer cover, the outer wall of the sliding cylinder near one end of the outer cover is provided with a second retaining rib, the sliding sleeve is sleeved on the outer periphery of the sliding cylinder, and the first retaining rib abuts against the second retaining rib.

[0015] According to the self-venting cover structure provided in the embodiment of this utility model, the inner cover is cylindrical and has a positioning plate protruding from its outer periphery. The outer cover is sleeved on the inner cover and its end abuts against the positioning plate. Alternatively, the outer periphery of the inner cover is provided with an installation groove, and a sealing ring is installed in the installation groove.

[0016] According to the self-venting cover structure provided in the embodiment of this utility model, the outer cover is provided with a plurality of ventilation holes, the plurality of ventilation holes are arranged circumferentially at intervals, and / or, the ventilation holes are located at one end of the outer cover near the inner cover.

[0017] An embodiment of this utility model also proposes a lunch box, including a self-venting lid structure as provided in the embodiment of this utility model.

[0018] The self-venting cover structure provided in this embodiment of the utility model has at least the following beneficial effects: When a negative pressure forms inside the lunchbox, the user only needs to control the outer cover to move away from the inner cover, which will cause the sealing element to separate from the vent hole. Outside air can enter the lunchbox through the vent hole, air chamber, and vent hole, thereby balancing the air pressure inside the lunchbox and avoiding the problem of the self-venting cover structure being difficult to open due to negative pressure, thus improving the convenience for the user to open the lunchbox. When a positive pressure forms inside the lunchbox, the gas inside the lunchbox generates a thrust on the sealing element that is opposite to the elastic force of the elastic element. When the thrust is greater than the elastic force of the elastic element, the sealing element separates from the vent hole, and the internal pressure of the lunchbox is discharged through the vent hole, air chamber, and vent hole, effectively preventing the contents from splashing when the lunchbox is opened and ensuring the safety of the user.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 A schematic diagram of the overall structure of the self-venting cover provided for an embodiment of this utility model;

[0022] Figure 2 A cross-sectional view of the self-venting cover structure is provided for an embodiment of this utility model;

[0023] Figure 3 A cross-sectional view of the self-venting cover structure provided in this embodiment of the utility model, showing the sealing element and the return air hole separated;

[0024] Figure 4 This is a sectional view of the self-ventilating cover structure from an exploded angle, provided in an embodiment of the present utility model.

[0025] Figure 5 This is a schematic diagram of the structure of the outer cover provided in an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the inner cover provided in an embodiment of the present utility model.

[0027] The attached icons are numbered as follows:

[0028] 100. Outer cover; 110. Vent hole; 120. Connector; 121. Sliding channel; 122. Limiting groove; 123. Deformation clearance groove; 130. Sliding sleeve; 131. First retaining rib;

[0029] 200. Inner cover; 210. Vent hole; 220. Slide cylinder; 221. Second retaining rib; 230. Sealing ring;

[0030] 300. Air cavity;

[0031] 400. Pressure regulating component; 410. Elastic element; 420. Sealing element; 421. Connecting part; 422. Sealing part; 423. Limiting block; 424. Abutting part. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, left, right, etc., indicating the directional or positional relationship, are based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] Currently, insulated lunch boxes on the market often experience pressure differences between the inside of the box and the outside atmosphere due to temperature changes in the contents. This pressure difference manifests in two ways: when the contents are heated or fermentable (such as mung bean soup), positive pressure forms inside the box. Opening the box can easily cause the contents to splash out, and the lid may be blown off, potentially injuring the user and posing a safety hazard. Conversely, when the hot contents cool down, negative pressure forms inside the box. Under the pressure of the outside atmosphere, the lid becomes difficult to open, causing significant inconvenience and severely impacting the user experience.

[0037] To address the aforementioned problems, embodiments of this utility model propose a self-venting cover structure for use in lunch boxes. The specific structure and function of the self-venting cover structure provided by embodiments of this utility model will be described below with reference to text and accompanying drawings.

[0038] Reference Figures 1 to 6 The self-venting cover structure provided in this embodiment of the utility model includes: an outer cover 100, an inner cover 200, and a pressure regulating component 400. The outer cover 100 is made of materials such as plastic or stainless steel, and is generally circular. Its outer wall is provided with a vent hole 110 to ensure smooth airflow. The inner cover 200 is shaped to fit the outer cover 100, and a return vent 210 is provided at the center of the inner cover 200. The diameter of the return vent 210 is designed to a suitable size according to the size of the lunch box and usage requirements to ensure efficient gas flow. The outer cover 100 and the inner cover 200 are movably connected to define an air chamber 300. The pressure regulating assembly 400 is installed in the air chamber 300. The pressure regulating assembly 400 includes an elastic member 410 and a sealing member 420. The sealing member 420 is connected to the outer cover 100 and can slide toward or away from the inner cover 200. The elastic member 410 is disposed between the outer cover 100 and the sealing member 420 to push the sealing member 420 so that the end of the sealing member 420 abuts against and seals the return air hole 210. Furthermore, the outer cover 100 can move toward or away from the inner cover 200. When the outer cover 100 moves away from the inner cover 200, it can drive the sealing member 420 to move so that the sealing member 420 is separated from the return air hole 210.

[0039] When this self-venting cover structure is applied to an insulated lunch box, under normal use, the elastic element 410 can push the sealing element 420 so that its end abuts against the vent hole 210 of the inner cover 200, sealing the vent hole 210, preventing liquid leakage inside the lunch box and outside air from entering the lunch box, thus ensuring the heat preservation performance of the lunch box.

[0040] When negative pressure forms inside the lunchbox due to temperature drop, the user holds the outer cover 100 and pulls or rotates it outward, moving it away from the inner cover 200. Since the sealing element 420 is connected to the outer cover 100, its movement causes the sealing element 420 to move as well, separating it from the vent 210. At this time, outside air can enter the lunchbox sequentially through the vent 110, air chamber 300, and vent 210, quickly balancing the air pressure inside and outside the lunchbox. Once the air pressure is balanced, the user releases the outer cover 100. Under the spring force, the outer cover 100 moves towards the inner cover 200, simultaneously causing the sealing element 420 to re-engage and seal the vent 210, restoring the seal.

[0041] When positive pressure forms inside the lunchbox due to increased temperature, this pressure acts on the seal 420, generating a thrust opposite to the spring force. As the internal pressure gradually increases, when the thrust exceeds the spring force, the seal 420 is pushed upwards, separating from the vent 210. At this point, the internal pressure is released to the outside through the vent 210, the air chamber 300, and the vent 110, thus reducing the internal pressure and preventing contents from splashing out due to positive pressure opening, as well as the seal being blown off and causing injury. When the internal pressure decreases to a certain level, making the thrust less than the spring force, the spring pushes the seal 420 to re-engage and seal the vent 210, preventing further leakage of the contents and maintaining the lunchbox's sealed state.

[0042] The self-venting cover structure provided in this embodiment of the utility model can automatically or manually adjust the air pressure inside and outside the lunch box, effectively solving many problems caused by pressure difference in existing lunch boxes and significantly improving the user experience of the lunch box.

[0043] Reference Figures 2 to 6 According to the self-venting cover structure provided in this embodiment of the present invention, the outer cover 100 is made of plastic material, and a connector 120 extending toward the inner cover 200 is provided on its side facing the inner cover 200. The connector 120 is cylindrical or rod-shaped and is integrally injection molded with the outer cover 100 to ensure the stability and firmness of the structure. The sealing element 420 includes a connecting part 421 and a sealing part 422. The shape of the connecting part 421 matches that of the connector 120, and after being connected to the connector 120, it can slide toward or away from the inner cover 200. For example, when the connector 120 is cylindrical, the connecting part 421 of the sealing element 420 is rod-shaped, and the rod-shaped connecting part 421 is inserted into the cylindrical connector 120. Or, for example, when the connector 120 is rod-shaped, the connecting part 421 is cylindrical, and the cylindrical connecting part 421 is sleeved on the outer periphery of the rod-shaped connector 120. The sealing part 422 is a circular protrusion located at the end of the connecting part 421 away from the outer cover 100. Its shape is approximately circular, and its diameter is slightly larger than the diameter of the vent hole 210 on the inner cover 200, allowing it to abut against the vent hole 210 to achieve a seal. The elastic element 410 is made of springs, elastic sleeves, etc., with its two ends abutting against the connecting part 421 of the outer cover 100 and the sealing part 420, respectively. During installation, the elastic element 410 is in a pre-compressed state, causing the elastic force generated by the elastic element 410 to push the connecting part 421 of the sealing part 420, thereby causing the sealing part 422 to abut against the vent hole 210 of the inner cover 200. This ensures that the inside of the lunchbox is isolated from the outside air under normal use, preventing liquid leakage and heat loss.

[0044] Reference Figures 2 to 6According to the self-venting cover structure provided in this embodiment of the present invention, the connecting member 120 is a cylindrical structure with a sliding channel 121 opening toward the inner cover 200. A limiting groove 122 is provided on the inner wall of the sliding channel 121. The limiting groove 122 is elongated and extends along the length of the sliding channel 121. Its width and depth are adapted to the size of the limiting block 423 of the connecting part 421 to ensure that the limiting block 423 can slide stably within it without falling out. The connecting part 421 of the sealing member 420 is rod-shaped. The outer diameter of the rod-shaped connecting part 421 matches the inner diameter of the sliding channel 121, so that the connecting part 421 can slide smoothly within the sliding channel 121. On the outer periphery of the connecting part 421, a limiting block 423 is integrally formed. The shape of the limiting block 423 is adapted to the limiting groove 122 and is an elongated protruding structure. When the seal 420 is installed on the connector 120, the connector 421 is inserted into the sliding channel 121, and the limiting block 423 is engaged in the limiting groove 122. The seal 420 can then slide stably along the sliding channel 121 toward or away from the inner cover 200. The cooperation between the limiting block 423 and the limiting groove 122 can effectively prevent the seal 420 from twisting or coming out of the sliding channel 121 during the sliding process.

[0045] When negative pressure forms inside the lunchbox, the user pulls the outer cover 100 outward. The outer cover 100 moves the connecting piece 120, and the limiting block 423 on the connecting part 421 abuts against the groove wall of the limiting groove 122. This causes the sealing piece 420 and the connecting piece 120 to move together, separating the sealing part 422 from the vent 210. Outside air can then enter the lunchbox through the vent 110, air chamber 300, and vent 210 of the outer cover 100, balancing the internal and external air pressure. Once the air pressure is balanced, the outer cover 100 is released. Under the elastic force of the elastic member 410, the outer cover 100 and the sealing piece 420 return to their initial positions, and the sealing part 422 seals the vent 210 again.

[0046] Optionally, the outer periphery of the connecting part 421 is provided with two limiting blocks 423, which are arranged symmetrically on the axis. Correspondingly, the inner wall of the sliding channel 121 is also provided with two limiting grooves 122. Each limiting block 423 is inserted into a limiting groove 122, thereby ensuring the reliability of the connection between the connecting part 421 and the connecting member 120.

[0047] Reference Figure 4 and Figure 5According to the self-venting cover structure provided in this embodiment of the utility model, the connecting member 120 extending from the outer cover 100 toward the inner cover 200 is a cylindrical structure. The outer wall of the connecting member 120 is provided with a deformation clearance groove 123 penetrating the sliding channel 121. The deformation clearance groove 123 is elongated, and its width and depth are controlled according to actual design requirements. Along the circumferential direction of the connecting member 120, the deformation clearance groove 123 and the limiting groove 122 on the inner wall of the sliding channel 121 are offset from each other, which helps to ensure the structural strength of the connecting member 120. The connecting part 421 of the seal 420 is rod-shaped and has a limiting block 423 on its outer periphery. During installation, the connecting part 421 is inserted into the sliding channel 121. Since the limiting block 423 protrudes from the connecting part 421, the opening of the sliding channel 121 needs to be deformed during the process of the limiting block 423 being inserted into the limiting groove 122. The deformation clearance groove 123 is designed to provide deformed space for the connecting part 120, so that the limiting block 423 can be inserted into the limiting groove 122 better.

[0048] Reference Figures 2 to 6 According to the self-venting cover structure provided in this embodiment of the utility model, the connecting member 120 extending from the outer cover 100 toward the inner cover 200 is a hollow cylindrical structure, integrally formed with the outer cover 100, ensuring the connection strength and integrity between the connecting member 120 and the outer cover 100. The sealing member 420 consists of a connecting part 421 and a sealing part 422. The connecting part 421 is rod-shaped, with an abutment part 424 around its outer periphery. The abutment part 424 is a circular ring structure protruding outward, integrally formed with the connecting part 421, and its outer diameter is precisely designed according to the subsequent spring installation requirements. The sealing part 422 is a circular protrusion that matches the shape of the vent hole 210 of the inner cover 200, which can tightly fit the vent hole 210 to achieve a seal. The elastic member 410 is a spring. During installation, the spring is first sleeved on the connecting member 120. Since the connecting member 120 is cylindrical, the spring can be smoothly sleeved and moved along the axial direction of the connecting member 120. Next, the connecting part 421 of the sealing element 420 is also inserted into the sliding channel 121 of the connecting element 120, and the limiting block 423 on the connecting part 421 is engaged in the limiting groove 122 on the inner wall of the sliding channel 121, so that one end of the spring abuts against the outer cover 100 and the other end abuts against the abutting part 424 of the connecting part 421 of the sealing element 420. At this time, the spring is pre-compressed to a certain extent, so that the spring generates an initial elastic force. Under the action of this elastic force, the sealing part 422 of the sealing element 420 abuts tightly against the vent 210 of the inner cover 200, thereby effectively preventing liquid leakage and heat loss in the lunch box and ensuring the heat preservation performance of the lunch box.

[0049] Reference Figures 2 to 5According to the self-venting cover structure provided in this utility model embodiment, the inner cover 200 is detachably connected to the outer cover 100. The user can remove the inner cover 200 from the outer cover 100 as needed, thereby facilitating cleaning, replacement of the seal 420, or other maintenance operations inside the self-venting cover structure.

[0050] Reference Figures 2 to 5 According to the self-venting cover structure provided in this embodiment of the utility model, a sliding sleeve 130 extending towards the inner cover 200 is integrally formed on the side of the outer cover 100 facing the inner cover 200. The sliding sleeve 130 is generally cylindrical, and its inner diameter is determined according to the subsequent fitting requirements with the inner cover 200 sliding cylinder 220 to ensure that the two can be fitted together. The inner wall of the sliding sleeve 130 near the inner cover 200 end is provided with a first retaining rib 131. The first retaining rib 131 is an annular protrusion that is evenly distributed around the inner wall of the sliding sleeve 130. Its height and width can be set according to actual needs, so that it can effectively abut against the second retaining rib 221 of the inner cover 200 without affecting the normal fitting and sliding of the sliding sleeve 130 and the sliding cylinder 220. The inner cover 200 has an integrally formed sliding cylinder 220 extending towards the outer cover 100 on the side facing the outer cover 100. The sliding cylinder 220 is also cylindrical, and its outer diameter matches the inner diameter of the sliding sleeve 130, allowing the sliding sleeve 130 to be fitted onto the outer circumference of the sliding cylinder 220. On the outer wall of the end of the sliding cylinder 220 facing the outer cover 100, a second retaining rib 221 is provided. The second retaining rib 221 is also an annular protrusion, evenly distributed around the outer wall of the sliding cylinder 220, and its shape and size correspond to the first retaining rib 131 so that the two can abut against each other.

[0051] When assembling the self-venting cover structure, the slide cylinder 220 of the inner cover 200 is aligned with the slide sleeve 130 of the outer cover 100, and the slide cylinder 220 is slowly inserted into the slide sleeve 130. As the slide cylinder 220 is inserted, the second retaining rib 221 gradually approaches and passes the first retaining rib 131, thereby achieving a slidable and detachable connection between the inner cover 200 and the outer cover 100. Specifically, when the outer cover 100 moves away from or towards the inner cover 200, the slide cylinder 220 and the second retaining rib 221 can slide within the slide sleeve 130; while when the outer cover 100 moves away from the inner cover 200 to a certain distance, the first retaining rib 131 and the second retaining rib 221 abut against each other, generating a certain frictional force and clamping force, thereby stably connecting the inner cover 200 to the outer cover 100. When it is necessary to remove the inner cover 200, simply hold the inner cover 200 and the outer cover 100 by hand, apply an appropriate external force to overcome the friction and clamping force between the first retaining rib 131 and the second retaining rib 221, and slowly pull the slide cylinder 220 out of the slide sleeve 130 to separate the inner cover 200 from the outer cover 100. This disassembly method is simple and convenient, requiring no other tools, and greatly improves the user's convenience.

[0052] Optionally, in some embodiments, the connector 120 is located in the middle of the outer cover 100, the sliding sleeve 130 is circumferentially disposed around the connector 120 and spaced apart from the connector 120, the vent hole 210 is located in the middle of the inner cover 200, and the sliding cylinder 220 is circumferentially disposed around the vent hole 210 and spaced apart from the vent hole 210. The sliding sleeve 130 and the sliding cylinder 220 have a gap, or the outer wall of the sliding sleeve 130 is provided with multiple ventilation grooves to ensure ventilation. Furthermore, the positions of the sliding sleeve 130 and the sliding cylinder 220 can be interchanged, and can be specifically set according to actual needs.

[0053] Reference Figures 2 to 6 According to the self-venting cover structure provided in this embodiment of the utility model, the inner cover 200 is cylindrical in shape and has a positioning plate protruding on its outer periphery. The outer cover 100 is cylindrical in shape and is sleeved on the outer periphery of the inner cover 200. The cylindrical inner cover 200 can guide the outer cover 100, thereby facilitating the alignment of the slide cylinder 220 and the slide sleeve 130, and the alignment of the sealing element 420 and the vent hole 210. In addition, by protruding the positioning plate on the outer periphery of the inner cover 200, the end of the outer cover 100 can maintain a stable connection with the inner cover 200 when it abuts against the positioning plate.

[0054] Reference Figure 4 and Figure 6 According to the self-venting cover structure provided in this embodiment of the utility model, the outer periphery of the inner cover 200 is provided with an installation groove. The installation groove is annular, and its depth and width are designed according to the specifications and installation requirements of the sealing ring 230. Specifically, the depth and width of the installation groove are slightly larger than the cross-sectional diameter of the sealing ring 230 to ensure that the sealing ring 230 can be securely installed in the groove, so that the sealing ring 230 will not be damaged due to being too tight or fall off due to being too loose after installation.

[0055] Optionally, the sealing ring 230 can be a rubber ring or a silicone ring, etc., which can be set according to actual needs.

[0056] Reference Figure 5 According to the self-venting cover structure provided in this embodiment of the utility model, the outer cover 100 is provided with a plurality of vent holes 110, which are arranged circumferentially at intervals. Specifically, with the center of the self-venting cover structure as the center, the plurality of vent holes 110 are evenly distributed on the circumference of the circle with the center as the center. For example, when there are 4 vent holes 110, the central angle between two adjacent vent holes 110 is 90 degrees; if there are 6 vent holes 110, the central angle between adjacent vent holes 110 is 60 degrees. The circumferentially spaced arrangement of the plurality of vent holes 110 enables the gas to be more evenly distributed when entering or exiting the lunch box, avoiding the situation where the local pressure is too high or too low due to the gas concentrating in and out of a certain area, thereby ensuring the stability and reliability of the pressure regulating function of the self-venting cover structure.

[0057] Optionally, there is a gap between the outer cover 100 and the inner cover 200 to ensure ventilation; multiple vent holes 110 can be spaced apart at one end of the outer cover 100 near the inner cover 200 to maintain the overall aesthetics of the outer cover 100. Furthermore, when the outer cover 100 is connected to the lunchbox shell, there is a gap between the outer cover 100 and the inner wall of the lunchbox shell to allow ventilation through the vent holes 110.

[0058] An embodiment of this utility model also proposes a lunch box, including a shell and a self-venting cover structure as provided in the embodiment of this utility model. The self-venting cover structure is connected to the shell of the lunch box by a threaded connection. The lunch box has all the beneficial effects of the self-venting cover structure provided in the embodiment of this utility model.

[0059] Optionally, in addition to lunch boxes, the self-venting lid structure can also be applied to insulated cups, insulated lunch boxes, portable heated insulated cups, etc.

[0060] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A self-venting cover structure, characterized in that, include: The outer cover (100) is provided with a vent (110); The inner cover (200) is provided with a vent hole (210). The inner cover (200) is movably connected to the outer cover (100) to define an air cavity (300) that communicates with the vent hole (210) and the air vent (110). A pressure regulating assembly (400) is disposed within the air chamber (300). The pressure regulating assembly (400) includes an elastic element (410) and a sealing element (420). The sealing element (420) is movably connected to the outer cover (100) and can move toward or away from the inner cover (200). The elastic element (410) is disposed between the outer cover (100) and the sealing element (420) to push the sealing element (420) so that the end of the sealing element (420) abuts against and seals the return air hole (210). The outer cover (100) can move toward or away from the inner cover (200). When the outer cover (100) moves away from the inner cover (200), it can drive the seal (420) to move so that the seal (420) is separated from the vent (210).

2. The self-venting cover structure according to claim 1, characterized in that, The outer cover (100) is provided with a connector (120) extending toward the inner cover (200). The sealing member (420) includes a connecting part (421) and a sealing part (422). The connecting part (421) is connected to the connector (120) and can slide toward or away from the inner cover (200). The elastic member (410) is provided on the connector (120) and its two ends abut against the outer cover (100) and the connecting part (421) respectively, so that the sealing part (422) abuts against and seals the vent hole (210).

3. The self-venting cover structure according to claim 2, characterized in that, The connector (120) is cylindrical and has a sliding channel (121) opening toward the inner cover (200). The inner wall of the sliding channel (121) is provided with a limiting groove (122). The limiting groove (122) extends along the axial direction of the sliding channel (121). The connecting part (421) is rod-shaped and has a limiting block (423) on its outer periphery. The connecting part (421) slides in the sliding channel (121), and the limiting block (423) slides in the limiting groove (122).

4. The self-venting cover structure according to claim 3, characterized in that, The outer wall of the connector (120) is provided with a deformation relief groove (123) that penetrates the sliding channel (121). Along the circumference of the connector (120), the deformation relief groove (123) is offset from the limiting groove (122).

5. The self-venting cover structure according to claim 3, characterized in that, The elastic element (410) is a spring, and the outer periphery of the connecting part (421) is provided with an abutment part (424). The spring is sleeved on the connecting element (120) and its end abuts against the abutment part (424).

6. The self-venting cover structure according to any one of claims 1 to 5, characterized in that, The inner cover (200) is detachably connected to the outer cover (100).

7. The self-venting cover structure according to claim 6, characterized in that, The outer cover (100) is provided with a sliding sleeve (130) extending toward the inner cover (200). The inner wall of the sliding sleeve (130) near the end of the inner cover (200) is provided with a first retaining rib (131). The inner cover (200) is provided with a sliding cylinder (220) extending toward the outer cover (100). The outer wall of the sliding cylinder (220) facing the end of the outer cover (100) is provided with a second retaining rib (221). The sliding sleeve (130) is sleeved on the outer periphery of the sliding cylinder (220). The first retaining rib (131) can abut against the second retaining rib (221).

8. The self-venting cover structure according to any one of claims 1 to 5, characterized in that, The inner cover (200) is cylindrical and has a positioning plate protruding from its outer periphery. The outer cover (100) is fitted onto the inner cover (200) and its end abuts against the positioning plate. Alternatively, the outer periphery of the inner cover (200) is provided with an installation groove, and a sealing ring (230) is installed in the installation groove.

9. The self-venting cover structure according to any one of claims 1 to 5, characterized in that, The outer cover (100) is provided with a plurality of ventilation holes (110), which are arranged circumferentially at intervals, and / or the ventilation holes (110) are located at one end of the outer cover (100) near the inner cover (200).

10. A lunchbox, characterized in that, Includes the self-venting cover structure as described in any one of claims 1 to 9.

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