A high-sealing, leak-proof disposable plastic lunch box

Abstract

This utility model relates to a highly sealed, leak-proof disposable plastic lunch box, including a box body, a lid, a sealing element, and an exhaust mechanism. The lid is located on top of the box body, and the lid and the box body are connected by the sealing element. The inner side wall of the lid is threaded to the outer edge of the mounting ring, which provides better sealing compared to traditional press-type lunch boxes. The bottom of the lid has a sealing ring that matches the annular groove on the top of the mounting ring. The sealing ring deforms under pressure, further improving the sealing performance. When the lid and box body are sealed, the internal pressure increases, and gas enters the air pipe through the connecting pipe, thereby pushing the rubber layer plate to move the push rod, causing the rubber sleeve to contract and deform. The surface of the rubber sleeve has multiple slots, making deformation of the rubber sleeve easy until the top of the connecting pipe inside the rubber layer plate connects with the air outlet, expelling excess gas from the box. After the pressure stabilizes, the rubber sleeve returns to its original position, sealing the air outlet and improving the sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of plastic lunch box technology, specifically a highly sealed and leak-proof disposable plastic lunch box. Background Technology

[0002] In today's fast-paced life, disposable plastic lunch boxes are widely used for food delivery, picnics, and work meals due to their lightweight and low cost. However, existing disposable plastic lunch boxes often face the problem of balancing sealing performance and ventilation requirements during use.

[0003] When hot soup, hot dishes, or other food with a certain temperature is placed in a lunchbox, the air inside the box expands due to the heat, increasing the internal pressure. If the lunchbox is sealed too tightly and lacks an effective venting route, the connection structure between the lid and the box may deform due to excessive pressure, potentially causing food leakage. This could not only contaminate the environment but also cause burns to the user.

[0004] On the other hand, in order to prevent food from leaking during transportation or carrying, existing lunch boxes often have reinforced sealing structures. However, this brings new problems. Under normal pressure, an overly strong seal may make it difficult to open, causing inconvenience to use. In addition, although some lunch boxes attempt to set simple vents, these vents are difficult to guarantee a good sealing effect under normal conditions, and soup may easily leak from the vents, failing to meet the high sealing and leak-proof requirements. Therefore, we need to provide a high-sealing and leak-proof disposable plastic lunch box. Utility Model Content

[0005] The purpose of this utility model is to provide a highly sealed, leak-proof disposable plastic lunch box. An exhaust mechanism is installed on the top of the lid and is connected to the inside of the box. When the pressure of hot food inside the box increases, the exhaust mechanism can expel the hot air from the box. It provides a sealing effect at room temperature. When hot food is placed inside the box, causing increased pressure, the exhaust mechanism can promptly expel the hot air, preventing the box from deforming due to excessive pressure. This reduces the risk of food leakage at the source, protects the cleanliness of the carrying environment, and reduces the possibility of burns to the user, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a highly sealed, leak-proof disposable plastic lunch box, comprising:

[0007] The box body, the box lid, the sealing element, and the venting mechanism are provided. The box lid is located on top of the box body and is connected to the box body by the sealing element. The venting mechanism is installed on top of the box lid and is used to discharge the high-pressure gas generated inside the box.

[0008] The exhaust mechanism includes a handrail, a connecting pipe, an air pipe, an air outlet, and a blocking component. The handrail is fixed to the top of the box cover and has an air pipe inside. The top of the box cover has a connecting pipe that communicates with the air pipe. The air outlet is located on the top of the handrail. The blocking component is installed inside the air pipe and blocks the air pipe under normal conditions.

[0009] Preferably, the blocking component includes a rubber disc, a push rod, and a rubber sleeve. The push rod is located inside the trachea, with a rubber disc fixedly installed at one end and a rubber sleeve fixedly installed at the other end. The surface of the rubber disc is in close contact with the inner wall of the trachea.

[0010] Preferably, the surface of the rubber sleeve is provided with multiple deformable slots, and several rings are fixedly installed on the surface of the push rod, with the surface of the rings closely fitting the inside of the trachea.

[0011] Preferably, a connecting pipe is provided inside the rubber layer disc, the top of the connecting pipe penetrating the top of the rubber layer disc, and one side penetrating the side of the rubber disc.

[0012] Preferably, the sealing element includes a mounting ring, the surface of which is threaded to the inner wall of the cover, a sealing ring is fixedly installed at the bottom of the cover, and an annular groove for placing the sealing ring is provided at the top of the mounting ring.

[0013] Preferably, a flow guide ring is fixedly installed on the inner wall of the box cover, and a plurality of support plates distributed in a ring-like manner are fixedly installed on the inner wall of the flow guide ring.

[0014] Preferably, a support ring is fixedly installed on the inner wall of the box, and a layered plate is provided on the top of the support ring.

[0015] Preferably, a limiting ring is fixedly installed at the bottom of the box, and the inner wall of the limiting ring is used in conjunction with the handrail.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention features a venting mechanism located on the top of the lid, connected to the interior of the container. When the pressure of hot food inside the container increases, the venting mechanism expels the hot air, providing a sealing effect at room temperature. When hot food increases pressure, the venting mechanism promptly releases the hot air, preventing the container from deforming due to excessive pressure and reducing the risk of food leakage. This protects the cleanliness of the carrying environment and reduces the possibility of burns to the user. At room temperature, the mechanism provides a tight seal, effectively preventing leakage of soup and meeting the core requirement of high sealing and leak prevention. It solves the problem of traditional lunchboxes struggling to balance sealing and venting. Furthermore, it eliminates the need for an overly strong sealing structure, avoiding difficulties in opening the container due to negative pressure, thus improving ease of use and balancing practicality and safety. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is an exploded perspective view of the structure of this utility model;

[0020] Figure 3 This is a three-dimensional bottom view of the structure of this utility model;

[0021] Figure 4 This is a perspective sectional view of the box lid of this utility model;

[0022] Figure 5 This is a three-dimensional sectional view of the handrail of this utility model.

[0023] In the diagram: 1. Box body; 2. Box cover; 3. Sealing element; 31. Mounting ring; 32. Sealing ring; 33. Annular groove; 4. Exhaust mechanism; 41. Handrail; 42. Connecting pipe; 43. Air pipe; 44. Air outlet; 45. Blocking element; 451. Rubber layer plate; 452. Push rod; 453. Rubber sleeve; 5. Groove; 6. Ring body; 7. Connecting pipe; 8. Guide ring; 9. Support plate; 10. Support ring; 11. Layered plate; 12. Limiting support ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 This utility model provides a technical solution: a highly sealed, leak-proof disposable plastic lunch box, comprising:

[0026] Box body 1, box cover 2, sealing element 3 and exhaust mechanism 4. The box cover 2 is located on top of the box body 1 and is connected to the box body 1 through the sealing element 3. The exhaust mechanism 4 is installed on top of the box cover 2 and is used to exhaust the gas generated under high pressure inside the box body 1.

[0027] The exhaust mechanism 4 includes a handrail 41, a connecting pipe 42, an air pipe 43, an air outlet 44, and a blocking component 45. The handrail 41 is fixed to the top of the cover 2 and has an air pipe 43 inside. The top of the cover 2 has a connecting pipe 42 that communicates with the air pipe 43. The air outlet 44 is located on the top of the handrail 41. The blocking component 45 is installed inside the air pipe 43 and blocks the air pipe 43 under normal conditions.

[0028] Specifically, an exhaust mechanism 4 is installed on the top of the lid 2, and the exhaust mechanism 4 is connected to the inside of the box body 1. When the pressure of hot food in the box body 1 increases, the exhaust mechanism 4 can expel the hot air inside the box body 1. Under normal temperature conditions, it can achieve a sealing effect. When hot food is placed inside the box, causing the pressure to increase, the exhaust mechanism 4 can expel the hot air in time, preventing the box body 1 from deforming due to excessive pressure, thereby reducing the risk of food leakage from the source. This protects the cleanliness of the carrying environment and reduces the possibility of users being burned. Under normal temperature conditions, the mechanism can seal tightly, effectively preventing soup leakage, meeting the core requirement of high sealing and leak prevention, and solving the pain point of traditional lunch boxes that are difficult to balance sealing and venting. At the same time, it does not rely on an overly strong sealing structure, avoiding the problem of difficulty in opening the box body 1 due to negative pressure, improving the convenience of use, and taking into account both practicality and safety.

[0029] The blocking component 45 includes a rubber plate 451, a push rod 452 and a rubber sleeve 453. The push rod 452 is located inside the trachea 43. One end of the push rod is fixedly installed with the rubber plate 451, and the other end is fixedly installed with the rubber sleeve 453. The surface of the rubber plate 451 is tightly fitted to the inner wall of the trachea 43.

[0030] Furthermore, the rubber plate 451 is made of food-grade silicone material, and its surface is tightly fitted with the inner wall of the air tube 43 to form the first line of defense for sealing. The connection between the rubber plate 451 and the push rod 452 ensures that the two can move synchronously when the gas is pushed. The rubber sleeve 453 is made of aging-resistant EPDM rubber, and its integral molding structure with the push rod 452 avoids the risk of leakage at the connection. When the pressure inside the box 1 increases, the gas pushes the rubber plate 451, which in turn drives the push rod 452 and the rubber sleeve 453 to move, thereby realizing the exhaust. After the pressure is restored, the elasticity of the rubber sleeve 453 resets the plug 45, ensuring a seal and solving the problems of easy loosening and unreliable sealing in traditional exhaust structures.

[0031] The surface of the rubber sleeve 453 is provided with multiple deformable slots 5, and several rings 6 are fixedly installed on the surface of the push rod 452. The surface of the rings 6 is tightly fitted with the inside of the air tube 43.

[0032] It is worth noting that several rings 6 are fixedly installed on the surface of the push rod 452. The rings 6 are made of polytetrafluoroethylene (PTFE), and their surfaces are tightly fitted with the inside of the air tube 43 to form a second seal. The groove 5 design of the rubber sleeve 453 makes it easier to deform under gas pressure, reducing exhaust resistance. The fit between the rings 6 and the inner wall of the air tube 43 further enhances the sealing effect. Even if there are minor flaws in the seal of the rubber layer plate 451, the rings 6 can still prevent liquid leakage. This double-sealing structure improves the leak-proof performance of the lunch box and solves the problem of easy failure of a single seal.

[0033] A connecting pipe 7 is provided inside the rubber layer tray 451. The top of the connecting pipe 7 passes through the top of the rubber layer tray 451, and one side passes through the side of the rubber tray.

[0034] It should be noted that a connecting pipe 7 is provided inside the adhesive tray 451. The top of the connecting pipe 7 extends through the top of the adhesive tray 451, and one side extends through the side of the adhesive tray 451. The inner diameter of the connecting pipe 7 is 0.8-1.2mm. The design of the connecting pipe 7 allows the gas inside the box 1 to be discharged through the air pipe 43 and the air outlet 44 when the adhesive tray 451 is pushed to a specific position. When the pressure inside the box 1 is normal, the connecting pipe 7 is blocked by the inner wall of the air pipe 43 to ensure a seal. When the pressure increases, the adhesive tray 451 moves, and the connecting pipe 7 is opened to achieve exhaust. This structure precisely controls the timing of exhaust and solves the problem that traditional exhaust ports cannot automatically open and close according to pressure.

[0035] The sealing element 3 includes a mounting ring 31, the surface of which is threaded to the inner wall of the cover 2, a sealing ring 32 is fixedly installed at the bottom of the cover 2, and an annular groove 33 for placing the sealing ring 32 is provided on the top of the mounting ring 31.

[0036] Furthermore, the surface of the mounting ring 31 is connected to the inner wall of the lid 2 via a modified triangular thread with a thread helix angle of 1.5°-2.5°. A sealing ring 32, made of food-grade nitrile rubber, is fixedly installed at the bottom of the lid 2. The mounting ring 31 has an annular groove 33 at its top for placing the sealing ring 32. The depth of the annular groove 33 is 0.3-0.5mm greater than the thickness of the sealing ring 32. The threaded connection between the mounting ring 31 and the lid 2 has a self-locking function. With the fitting of the sealing ring 32 and the annular groove 33, when the lid 2 is tightened, the sealing ring 32 is compressed and deformed, filling the gap between the annular groove 33 and the bottom of the lid 2, forming a highly efficient seal. Compared with the traditional press-type seal, this structure improves the sealing performance and solves the problem of easy leakage in traditional lunch boxes.

[0037] A guide ring 8 is fixedly installed on the inner wall of the box cover 2, and several support plates 9 are fixedly installed on the inner wall of the guide ring 8 in a ring-like arrangement.

[0038] Furthermore, a guide ring 8 is fixedly installed on the inner wall of the lid 2. The guide ring 8 is made of polypropylene and has a conical structure with a taper of 30°-45°. Several surrounding support plates 9 are fixedly installed on the inner wall of the guide ring 8. The support plates 9 and the guide ring 8 are integrally injection molded. When the lid 2 is opened, the conical structure of the guide ring 8 can guide the water vapor at the bottom of the lid 2 back into the box body 1, reducing leakage. The support plates 9 not only enhance the structural strength of the guide ring 8, but also further guide the flow of water vapor. This design solves the problem of water vapor leakage and environmental pollution when the lunch box is opened, while also improving the overall support performance of the lid 2.

[0039] A support ring 10 is fixedly installed on the inner wall of the box 1, and a layered plate 11 is provided on the top of the support ring 10;

[0040] The inner wall of the container body 1 is fixedly fitted with a support ring 10, which is integrally formed with the container body 1. A layered tray 11 is located on top of the support ring 10. The layered tray 11 is made of transparent polyvinyl chloride (PVC) material, and its edges are fitted to the top of the support ring 10. The support ring 10 provides stable support for the layered tray 11, allowing food to be placed in layers within the container, preventing mixing and contamination between different foods. The transparent design of the layered tray 11 allows users to easily observe the food inside the container. The connection between the support ring 10 and the container body 1 ensures its load-bearing capacity, solving the problem of traditional container layers not being possible.

[0041] A limiting ring 12 is fixedly installed at the bottom of the box body 1, and the inner wall of the limiting ring 12 is used in conjunction with the handrail 41.

[0042] A limiting ring 12 is fixedly installed at the bottom of the box body 1. The limiting ring 12 is integrally injection molded with the box body 1. The inner wall of the limiting ring 12 is used in conjunction with the handle 41. The gap between the two is 0.1-0.3mm. When multiple lunch boxes are stacked, the handle 41 of the upper lunch box is inserted into the limiting ring 12 of the lower lunch box. The cooperation between the two achieves horizontal limiting, preventing the lunch boxes from shifting or tipping over when stacked. This solves the problem of instability when stacking traditional lunch boxes and improves the convenience of transportation and storage.

[0043] All threaded mounting surfaces in this application utilize a modified triangular thread with a self-locking function. The thread helix angle is designed to be 1.5°-2.5° to enhance the anti-loosening effect. After phosphating, the thread surface is coated with an 8-12μm Dacromet coating and impregnated with silicone sealant to form a sealing layer, resulting in excellent corrosion resistance. In addition, the thread can effectively expel dust, and it can still be used normally even if a small amount of dust adheres to it.

[0044] All rubber materials used in this application are made of food-grade silicone.

[0045] The inner wall of the lid 2 of this device is threaded onto the outer edge of the mounting ring 31, providing better sealing compared to traditional press-type lunch boxes. The bottom of the lid 2 has a sealing ring 32 that matches the annular groove 33 on the top of the mounting ring 31. The sealing ring 32 deforms under pressure, further improving the seal. The lid 2 can be easily rotated using the handle 41. Because the inner wall of the lid 2 has a guide ring 8 (conical in shape) and a support plate 9, when the lid 2 is opened, moisture from the bottom of the lid 2 is guided into the box body 1, reducing leakage. The support plate 9 guides moisture and enhances support. The bottom of the box body 1 also has an integrally formed support ring 1. 0. The inner wall of the support ring 10 is adapted to the surface of the handrail 41. When multiple lunch boxes are stacked, it has a horizontal limiting function. When the lid 2 is sealed to the box body 1, the internal pressure increases. Gas enters the air pipe 43 through the connecting pipe 42, thereby pushing the rubber layer plate 451 to drive the push rod 452 to move, causing the rubber sleeve 453 to shrink and deform. The surface of the rubber sleeve 453 is provided with multiple slots 5, which makes the deformation of the rubber sleeve 453 easy until the top of the connecting pipe 7 in the rubber layer plate 451 is connected to the air outlet 44, and the excess gas in the box body 1 is discharged. After the pressure stabilizes, the rubber sleeve 453 returns to its original position and seals the air outlet 44, improving the sealing performance.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A highly sealed, leak-proof disposable plastic lunch box, characterized in that, include: Box body (1), box cover (2), sealing element (3) and exhaust mechanism (4), the box cover (2) is located on top of the box body (1), the box cover (2) and the box body (1) are connected by the sealing element (3), the exhaust mechanism (4) is installed on top of the box cover (2) and is used to exhaust the gas generated in the box body (1) under high pressure; The exhaust mechanism (4) includes a handrail (41), a connecting pipe (42), an air pipe (43), an air outlet (44), and a blocking component (45). The handrail (41) is fixed to the top of the cover (2) and has an air pipe (43) inside. The top of the cover (2) has a connecting pipe (42) that communicates with the air pipe (43). The air outlet (44) is located on the top of the handrail (41). The blocking component (45) is installed inside the air pipe (43) and blocks the air pipe (43) under normal conditions.

2. The high-sealing, leak-proof disposable plastic lunch box according to claim 1, characterized in that: The blocking component (45) includes a rubber plate (451), a push rod (452) and a rubber sleeve (453). The push rod (452) is located inside the trachea (43), with a rubber plate (451) fixedly installed at one end and a rubber sleeve (453) fixedly installed at the other end. The surface of the rubber plate (451) is tightly fitted to the inner wall of the trachea (43).

3. The highly sealed, leak-proof disposable plastic lunch box according to claim 2, characterized in that: The surface of the rubber sleeve (453) is provided with multiple deformable slots (5), and several rings (6) are fixedly installed on the surface of the push rod (452). The surface of the rings (6) is tightly fitted with the inside of the air tube (43).

4. A highly sealed, leak-proof disposable plastic lunch box according to claim 3, characterized in that: A connecting pipe (7) is provided inside the rubber layer disc (451). The top of the connecting pipe (7) penetrates the top of the rubber layer disc (451), and one side penetrates the side of the rubber disc.

5. A highly sealed, leak-proof disposable plastic lunch box according to claim 1, characterized in that: The sealing element (3) includes a mounting ring (31), the surface of which is threaded to the inner wall of the cover (2), a sealing ring (32) is fixedly installed at the bottom of the cover (2), and an annular groove (33) for placing the sealing ring (32) is provided at the top of the mounting ring (31).

6. A highly sealed, leak-proof disposable plastic lunch box according to claim 5, characterized in that: A flow guide ring (8) is fixedly installed on the inner wall of the box cover (2), and a number of support plates (9) arranged in a ring are fixedly installed on the inner wall of the flow guide ring (8).

7. A highly sealed, leak-proof disposable plastic lunch box according to claim 1, characterized in that: A support ring (10) is fixedly installed on the inner wall of the box (1), and a layered plate (11) is provided on the top of the support ring (10).

8. A highly sealed, leak-proof disposable plastic lunch box according to claim 1, characterized in that: A limiting ring (12) is fixedly installed at the bottom of the box body (1), and the inner wall of the limiting ring (12) is used in conjunction with the handrail (41).

Images