Sealing cover assembly of food storage container and food storage container

Abstract

The utility model discloses a sealing cover assembly of a food storage container and the food storage container. The sealing cover assembly comprises a cover body supporting framework, a first-stage breathing structure and a second-stage breathing structure. A sealing joint part is arranged on the edge of a supporting wall of the cover body supporting framework, the first-stage breathing structure is connected to the inner wall of the supporting wall in a sealing mode and covers a container opening, the second-stage breathing structure is arranged on one side of the first-stage breathing structure and forms an interval space, the first-stage breathing structure is provided with a breathing hole with the hole diameter ranging from 0.1 micrometer to 3 micrometers and a hydrophobic part, and the second-stage breathing structure is provided with a pressure relief valve port. The food storage container is tightly sealed with the container body through the sealing joint part, the breathing hole and the drainage part cooperate to achieve gas-liquid separation, the pressure relief valve port balances internal and external air pressure, the interval space provides a condensation environment for water vapor, and when the food storage container adopts the sealing cover assembly of the structure, the food storage container can have the advantages of heat preservation, exhaust and condensation prevention at the same time; and dry and comfortable taste and original flavor of meals can be kept during storage and transportation.

Description

Technical Field

[0001] This utility model relates to the field of tableware technology, and in particular to a sealing assembly for a food storage container and a food storage container. Background Technology

[0002] Food storage permeates every aspect of daily diet, family life, food safety, and even the utilization of social resources. It's not simply about "putting things away," but rather a fundamental need to ensure healthy eating, reduce waste, lower costs, and adapt to a fast-paced lifestyle. As a result, various food storage containers have emerged on the market. Especially when food is taken out, such as in the food delivery sector, restaurants use food containers to facilitate transportation. Currently, common food containers on the market consist of two parts: the container body and the lid. In some containers, to prevent spillage, the lid is usually completely sealed when attached to the container body; others, to prevent heat loss, not only completely seal the lid to the container body but also thicken the walls of both the lid and the container or add insulation structures.

[0003] However, when using these food containers, especially when holding hot food (such as noodle soup, stir-fries, porridge, etc.), the hot food continuously releases a large amount of water vapor. The completely sealed lid and container structure block the escape path of the water vapor, causing it to accumulate inside the container. As the food is transported or left to stand for a longer period, the temperature inside the container gradually decreases, and the accumulated water vapor condenses into a large amount of dew on the inside of the lid and the inner wall of the container. This dew will drip back onto the food, causing a deterioration in texture: for example, noodles will become soft and sticky due to absorbing too much moisture, losing their chewy texture; fried foods will lose their crispness due to moisture, becoming soggy and greasy; and rice will clump together and become wet and sticky, affecting the eating experience. On the other hand, the condensed dew will alter the original flavor of the food; some soups will become diluted with water, losing their original fresh and fragrant taste.

[0004] Therefore, existing food storage containers cannot simultaneously achieve both heat preservation and food freshness preservation. Utility Model Content

[0005] The purpose of this invention is to solve the problem that food storage containers in the prior art cannot simultaneously keep food warm and preserve its freshness.

[0006] To achieve the above objectives, this application provides a sealing assembly for a food storage container, comprising: a lid support frame, a primary breathing structure, and a secondary breathing structure; the lid support frame has an annular support wall, and one side edge of the support wall forms a sealing joint for sealingly connecting with the opening edge of the container body of the food storage container; the primary breathing structure is sealed and connected to the inner wall surface of the support wall near the sealing joint, covering the opening of the container body; the secondary breathing structure is disposed on the side of the primary breathing structure away from the sealing joint, and the primary breathing structure and the secondary breathing structure are spaced apart by a preset distance; the primary breathing structure has at least one breathing part, each breathing part including multiple breathing holes with a diameter of 0.1μm to 3μm, a hydrophobic part is disposed on the side of the primary breathing structure facing the secondary breathing structure, and a pressure relief valve is disposed on the secondary breathing structure.

[0007] Using the above technical solution, when the sealing assembly provided in this application is applied to a food storage container, the cover support frame can form a tight seal with the container body through the sealing joint, thereby blocking the heat transfer path and achieving efficient heat preservation to maintain the temperature of the food. Moreover, the pore size design of the primary breathing structure is matched with the permeation conditions of gaseous water molecules, allowing gaseous water molecules to be smoothly discharged through the pores. At the same time, by utilizing the surface tension characteristics of liquid water, liquid water cannot break through the meniscus formed by the pore inlet. Combined with the low surface energy chemical structure and micro-nano rough physical structure of the hydrophobic part, water molecules are difficult to wet and spread, and can only form spherical water droplets that slide down the support wall. The space between the secondary breathing structure and the primary breathing structure can provide a buffer condensation environment for water vapor, and the pressure relief valve automatically opens and closes according to the pressure difference between the inside and outside, balancing the pressure while maintaining the seal.

[0008] Therefore, when the sealing component provided in this application is applied to food storage containers, it can achieve both heat preservation and venting and anti-condensation through the synergistic effect of sealing and heat preservation, gas-liquid separation and air pressure regulation, so that the food can always maintain a dry taste and original flavor during storage and transportation.

[0009] According to the sealing assembly of the food storage container provided in this application, the primary breathing structure can be bent relative to the supporting wall, and the edge of the primary breathing structure is bent toward the sealing joint to form a folded edge, which can be detachably and sealed to the inner wall surface of the supporting wall.

[0010] By adopting the above technical solution, the bending characteristics and folded edge design of the primary breathing structure can enhance the sealing effect by increasing the contact area with the support wall, reducing heat loss. The separable fitting design of the folded edge is not only conducive to sealing reliability, but also convenient for disassembly and cleaning, avoiding exhaust failure caused by food residue clogging the breathing hole. It has good sealing reliability and maintenance convenience, which is conducive to extending the service life of the component and promoting hygiene.

[0011] According to the sealing assembly of the food storage container provided in this application, a ring-shaped retaining structure is formed on one side edge of the supporting wall, and the sealing joint is an annular sealing ring that is engaged with the ring-shaped retaining structure.

[0012] By adopting the above technical solution, the annular retaining structure provides a stable installation base for the ring-shaped sealing ring. Utilizing the elastic deformation characteristics of the sealing ring, it fits tightly against the edge of the container body opening, which helps to enhance the sealing and heat preservation effect. At the same time, the elastic structure can absorb slight vibrations during transportation and disperse the impact force of collisions. Based on the principle of buffering and shock absorption, it reduces the relative displacement between the container body and the cap assembly, avoids food spillage, and achieves the effects of sealing and heat preservation, impact resistance and spill prevention. It is more suitable for the use needs of high-frequency transportation scenarios such as food delivery.

[0013] According to the sealing assembly of the food storage container provided in this application, a pressure-stabilizing chamber is formed between the primary breathing structure, the secondary breathing structure, and the inner wall of the supporting wall, and an openable and closable valve cover is provided on the pressure relief valve port.

[0014] Using the above technical solution, the pressure-stabilizing chamber can provide a dedicated condensation space for the discharged water vapor. Based on the principle of condensation of gaseous water molecules upon cooling, the water vapor condenses into liquid water in the chamber and is collected and stored, without contacting the food. Furthermore, based on the principle of air pressure balance, the valve cover can be opened to release pressure when the internal air pressure is too high, preventing container deformation or cap detachment. Once the air pressure is balanced, the valve cover can be closed to maintain pressure, preventing food contamination and dilution of the food due to condensed liquid water.

[0015] According to the sealing assembly of the food storage container provided in this application, the primary breathing structure includes multiple stacked breathing layers; wherein, each breathing layer has at least one layer breathing part, and the positions of at least one layer breathing part of each breathing layer in the stacking direction are respectively corresponding; the porosity of the breathing holes of each layer breathing part in each breathing layer is equal; and, among the multiple breathing layers, in two adjacent breathing layers in the stacking direction, the porosity of the layer breathing part of the breathing layer closer to the secondary breathing structure is smaller than the porosity of the layer breathing part of the breathing layer closer to the container body.

[0016] By adopting the above technical solution, the stacked design of multiple breathable layers and the setting of porosity gradient can allow gaseous water molecules to gradually permeate and be discharged based on the gradient filtration principle. At the same time, it can block the reverse permeation of liquid water layer by layer, which is conducive to improving the stability and reliability of breathability and hydrophobicity. Moreover, the multi-layer structure can disperse the impact of airflow, reduce the wear and blockage of a single breathable layer, and help extend the service life of breathability and hydrophobicity performance. It is more suitable for hot food storage scenarios with high humidity and high temperature.

[0017] According to the sealing assembly of the food storage container provided in this application, the pore sizes of the breathing holes of each breathing part on each breathing layer are equal; and among the multiple breathing layers, in two adjacent breathing layers in the stacking direction, the pore size of the breathing part of the breathing layer closer to the secondary breathing structure is smaller than the pore size of the breathing part of the breathing layer closer to the container body.

[0018] By adopting the above technical solution, the larger pore breathable layer near the container body can quickly accept a large number of gaseous water molecules, while the smaller pore breathable layer near the secondary breathable structure can further block fine liquid water droplets, thus achieving adaptability to food with different humidity levels. It can quickly expel a large amount of water vapor generated by high humidity food, while maintaining a moderate seal for low humidity food, thus balancing good air permeability and sealing effect and improving the versatility of the sealing component.

[0019] According to the food storage container sealing assembly provided in this application, the primary breathing structure is a flexible membrane, the secondary breathing structure is a plate, and the secondary breathing structure is integrally formed with the supporting wall.

[0020] Using the above technical solution, the flexible membrane-like primary breathing structure can closely fit the inner wall of the support wall, which is beneficial to improving the sealing effect, while the plate-like secondary breathing structure and the integrated molding design of the support wall can improve the overall structural rigidity of the sealing assembly.

[0021] According to the sealing assembly of the food storage container provided in this application, the primary breathing structure is made of polytetrafluoroethylene, thermoplastic polyurethane, polyethylene or polypropylene; and the secondary breathing structure and the support wall are both made of polycarbonate or polypropylene.

[0022] Using the above technical solutions, materials such as polytetrafluoroethylene have excellent hydrophobic properties and chemical stability. The inert groups in their molecular structure can reduce surface energy and enhance the hydrophobic effect, while meeting food contact safety standards. Polycarbonate and polypropylene materials have high rigidity and good temperature resistance, which can ensure the structural strength of the support wall and secondary breathing structure, which is beneficial to resisting external impacts during transportation and improving the stability of the sealing components during long-term use.

[0023] This application also provides a food storage container, including a container body and a capping assembly for the food storage container with the above-described structure; wherein, one end of the container body has an opening, the capping assembly covers the opening, and the sealing joint is sealed to the edge sidewall of the opening.

[0024] By adopting the above technical solution, the sealing joint design between the capping component and the container body can achieve efficient heat preservation and reliable sealing of the container as a whole. Combined with the air-permeable and water-repellent function of the above-mentioned capping component, the structure of gas-liquid separation and air pressure regulation can enable the food storage container to take into account the advantages of sealing and heat preservation as well as preventing condensation, thus ensuring the food storage container is kept in good condition and helps the food maintain its original temperature, taste and flavor during storage and transportation.

[0025] According to the food storage container provided in this application, the folded edge of the primary breathing structure is held between the sealing joint and the edge sidewall of the opening.

[0026] By adopting the above technical solution, when assembling the food storage container and the sealing assembly, the elastic pressure of the sealing joint can be used to tightly fix the folded edge. This not only helps to improve the sealing fit between the primary breathing structure and the container body opening, but also allows for assembly and fixation without the need for additional fixing structures. It has the advantages of convenient assembly and reliable sealing. Attached Figure Description

[0027] Figure 1 A three-dimensional structural schematic diagram of the sealing assembly of the food storage container provided in an embodiment of this application;

[0028] Figure 2 A three-dimensional structural schematic diagram of the sealing assembly of the food storage container provided in an embodiment of this application from another perspective;

[0029] Figure 3 A cross-sectional structural schematic diagram of the sealing assembly of a food storage container provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram of a primary breathing structure in the sealing assembly of a food storage container provided in an embodiment of this application;

[0031] Figure 5 Another schematic diagram of the primary breathing structure in the sealing assembly of the food storage container provided in this application embodiment;

[0032] Figure 6 A three-dimensional structural diagram of the container body in the food storage container provided in the embodiments of this application;

[0033] Figure 7 A three-dimensional structural diagram of the food storage container and sealing assembly provided in an embodiment of this application;

[0034] Figure 8 This is a cross-sectional structural diagram of the food storage container and sealing assembly provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Capping assembly;

[0037] 110. Cover support frame; 111. Support wall; 112. Annular retaining structure; 120. Sealing joint; 130. Primary breathing structure; 131. Breathing section; 132. Hydrophobic section; 133. Folded edge; 134. Breathing layer; 1341. Layered breathing section; 140. Secondary breathing structure; 141. Pressure relief valve port; 142. Valve cover; 150. Pressure stabilizing chamber;

[0038] 200. Food storage container; 210. Container body; 211. Opening. Detailed Implementation

[0039] The purpose of this application is to solve the problem that existing food storage containers cannot simultaneously achieve heat preservation and food freshness. To address this, this application proposes a sealing assembly for a food storage container and the food storage container itself. Through the coordinated design of the lid support frame, primary ventilation structure, and secondary ventilation structure, efficient air venting is achieved while ensuring airtightness and heat preservation, preventing water vapor condensation from affecting the quality of the food.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0041] Please see Figures 1 to 3 The food storage container sealing assembly 100 provided in this application includes a lid support frame 110, a primary ventilation structure 130, and a secondary ventilation structure 140. The lid support frame 110 has an annular support wall 111, and one side edge of the support wall 111 forms a sealing joint 120 for sealingly connecting with the edge of the opening 211 of the container body 210 of the food storage container 200. The primary ventilation structure 130 is sealed to the inner wall surface of the support wall 111 near the sealing joint 120 and covers the opening 211 of the container body 210 (e.g., ...). Figure 8 (As shown); the secondary breathing structure 140 is disposed on the side of the primary breathing structure 130 away from the sealing joint 120, and the primary breathing structure 130 and the secondary breathing structure 140 are spaced apart by a preset distance; the primary breathing structure 130 has at least one breathing part 131, as shown. Figure 4 As shown, there may be 7 breathing sections 131, each breathing section 131 including multiple breathing holes with a diameter of 0.1μm to 3μm, and the number of breathing holes is unlimited.

[0042] Furthermore, a hydrophobic portion 132 is provided on the side of the primary breathing structure 130 facing the secondary breathing structure 140 (see...). Figure 5 A pressure relief valve 141 may be provided on the secondary breathing structure 140.

[0043] For details, see Figure 3 The cap support frame 110 is the main support structure of the cap assembly 100. The support wall 111 is annular and can be made of rigid materials such as polycarbonate or polypropylene to ensure structural stability. The sealing joint 120 is used to achieve a sealed connection between the cap assembly 100 and the container body 210. Its structure can be adapted to the edge shape of the opening 211 of the container body 210 to ensure a sealing effect and reduce heat loss.

[0044] It should be understood that the specific size of the breather hole is not limited, for example, it can be set in the range of 0.1μm to 3μm. The specific size should be set according to the actual design and usage requirements. This application does not make a unique requirement.

[0045] Specifically, the primary breathing structure 130 is the core component for achieving the breathable and hydrophobic functions. It covers the opening 211 of the container body 210. The pore size of its breathing part 131 is set to 0.1μm to 3μm. This size allows gaseous water molecules to pass through while using the surface tension of liquid water to prevent liquid water from penetrating and avoid spillage of food and soup. The hydrophobic part 132 can be achieved by coating the surface of the primary breathing structure 130 with a fluorocarbon coating, silicone coating, etc., or by integrally molding it with a material that has hydrophobic properties (such as polytetrafluoroethylene). For example, the substrate itself has a "hydrophobic layer." Taking expanded polytetrafluoroethylene film as an example, the CF bonds of its molecular chains will form an "inert fluorocarbon hydrophobic layer" on the surface of the material. This further enhances the hydrophobic effect and prevents water vapor from condensing on the side of the primary breathing structure 130 facing the secondary breathing structure 140.

[0046] See Figure 3 The secondary breathing structure 140 is spaced apart from the primary breathing structure 130 to form a buffer space. Its material can be the same as the support wall 111, forming a plate-like structure to improve overall rigidity. The pressure relief valve 141 is located on the secondary breathing structure 140 to regulate the pressure balance inside and outside the container, preventing the sealing joint 120 from failing due to excessive internal pressure. At the same time, it maintains a seal when the pressure is balanced, thus ensuring heat preservation.

[0047] The capping assembly 100 provided in this application, see [reference] Figure 3 and Figure 8The lid support frame 110 forms a tight seal with the edge of the opening 211 of the container body 210 through the sealing joint 120. This sealing structure blocks the heat transfer path, achieving efficient heat preservation to maintain the food temperature. The pore size design of the primary breathing structure 130 matches the permeability conditions of gaseous water molecules, allowing them to drain smoothly through the pores. Simultaneously, utilizing the surface tension characteristics of liquid water, liquid water cannot break through the meniscus formed at the pore inlet. Combined with the low surface energy chemical structure and micro-nano rough physical structure of the hydrophobic part 132, water molecules are difficult to wet and spread, only forming spherical water droplets that slide down the support wall 111. The space between the secondary breathing structure 140 and the primary breathing structure 130 provides a buffer condensation environment for water vapor, and the pressure relief valve 141 automatically opens and closes according to the internal and external pressure difference, balancing the pressure while maintaining a seal. Through the synergistic effect of sealing and heat preservation, gas-liquid separation, and pressure regulation, both heat preservation and condensation prevention are achieved, ensuring that the food remains dry and retains its original flavor during storage and transportation.

[0048] In this application, the structure of the cover support frame is not limited, and various structural forms can be adopted to adapt to different types of container bodies 210.

[0049] In one implementation, see Figure 3 The support wall 111 can adopt an annular stepped structure, with an annular groove on its inner wall surface for embedding the primary breathing structure 130. The depth of the annular groove matches the thickness of the primary breathing structure 130, ensuring that the primary breathing structure 130 is flush with the inner wall surface of the support wall 111 after installation, thus improving the sealing effect. The outer diameter of the support wall 111 can be designed according to the inner diameter of the opening 211 of the container body 210, for example, to adapt to the opening of a common round lunch box. The outer diameter of the support wall 111 is 0.5mm to 1mm smaller than the inner diameter of the container opening. Specifically, it can be any size between 0.5mm and 1mm. This embodiment does not have a unique requirement. A tight fit is achieved through the elastic deformation of the sealing joint 120.

[0050] In another embodiment, the support wall 111 can be a polygonal ring structure (not shown), which can be adapted to the opening of a polygonal container body such as a square or rectangular shape. Each side of the support wall 111 can be provided with a reinforcing rib in the middle to enhance the structural rigidity of the support wall 111 and prevent deformation due to collisions during transportation, thus affecting the sealing effect. The height of the support wall 111 can be set in the range of 10mm to 20mm, ensuring sufficient installation space without excessively increasing the thickness of the cap assembly 100, facilitating stacking and storage.

[0051] The structure of the sealing joint 120 is not limited; for example, in one embodiment, see [reference needed]. Figure 3A ring-shaped retaining structure 112 is formed on one side edge of the support wall 111. The ring-shaped retaining structure 112 is an annular boss formed by the inward protrusion of the edge of the support wall 111. The sealing joint 120 is an annular sealing ring that is engaged with the ring-shaped retaining structure 112. The annular sealing ring can be made of food-grade silicone with a Shore hardness of 40° to 60°. Its cross-section is circular, and its diameter is 1 mm to 2 mm larger than the width of the annular groove of the ring-shaped retaining structure 112. A firm engagement is achieved through an interference fit. An inclined surface is provided on the outer side of the annular sealing ring. When the inclined surface is in contact with the edge of the opening 211 of the container body 210, it can guide the sealing joint 120 to be accurately positioned and enhance the sealing effect.

[0052] In another embodiment, the annular retaining structure 112 can also be configured as an annular groove. The outer side of the annular sealing ring is provided with an annular protrusion that matches the annular groove. After the annular protrusion is inserted into the annular groove, the annular sealing ring and the annular retaining structure 112 are fixed by ultrasonic welding to form a non-removable sealing structure. This structure is suitable for disposable food storage containers, improves sealing reliability, and avoids the degradation of sealing performance caused by repeated use.

[0053] The structure of the primary respiratory structure 130 is not limited; for example, in one embodiment, see [link to relevant documentation]. Figure 3 and Figure 4 The primary breathing structure 130 can be bent relative to the support wall 111. The edge of the primary breathing structure 130 is bent towards the sealing joint 120 to form a folded edge 133. The width of the folded edge 133 is 5mm to 8mm or even larger. The folded edge 133 is detachably and sealed to the inner wall surface of the support wall 111 using food-grade pressure-sensitive adhesive. The primary breathing structure 130 can be made of a polytetrafluoroethylene film with a thickness of 0.1mm to 0.3mm, which has good flexibility and is easy to bend and install. The folded edge 133 increases the contact area with the support wall 111, further enhancing the sealing effect and reducing heat loss. At the same time, the detachable design facilitates disassembly and cleaning, preventing the breathing hole from being blocked by food residue, which could lead to exhaust failure.

[0054] In another embodiment, an annular protrusion (not shown) may be provided on the folded edge 133 of the primary breathing structure 130, and a corresponding annular groove may be provided on the inner wall surface of the support wall 111. The annular protrusion and the annular groove cooperate to achieve positioning and enhance sealing performance. A hydrophobic part 132 may be provided on the side of the primary breathing structure 130 facing the container body 210. The hydrophobic part 132 may be a silicone coating sprayed on the surface of the primary breathing structure 130.

[0055] The number of breathing sections 131 in the primary breathing structure 130 is not limited. In one embodiment, the breathing section 131 is a circular region (see...). Figure 4Multiple breathing holes are evenly distributed on each breathing section 131. The specific number is not required. For example, the diameter of the breathing hole can be 1 μm and the porosity can be 40%. Multiple breathing sections 131 are evenly distributed along the circumference of the primary breathing structure 130 to ensure that gaseous water molecules are discharged evenly.

[0056] In another implementation, see Figure 5 The primary breathing structure 130 may include three stacked breathing layers 134, each breathing layer 134 having two layer breathing sections 1341, with the positions of the layer breathing sections 1341 of each breathing layer 134 corresponding one-to-one in the stacking direction. The pore size of the breathing pores of each layer breathing section 1341 in each breathing layer 134 is equal, for example, all can be set to 0.8μm, and the porosity is equal, all being 35%. In the stacking direction, the porosity of the layer breathing sections 1341 of the breathing layer 134 closer to the secondary breathing structure 140 is 5% smaller than the porosity of the layer breathing sections 1341 of the breathing layer 134 closer to the container body 210, forming a porosity gradient. The stacking design of the multiple breathing layers 134 and the setting of the porosity gradient, based on the gradient filtration principle, allow gaseous water molecules to gradually permeate and be discharged, while simultaneously blocking the reverse permeation of liquid water layer by layer, improving the stability and reliability of air permeability and hydrophobicity.

[0057] It is important to understand that porosity is a core indicator for measuring the internal pore characteristics of porous materials (such as breathable membranes), and refers to the percentage of the material's internal pore volume to its total volume.

[0058] In another embodiment, the primary breathing structure 130 may also include two stacked breathing layers 134 (not shown). The pore size of the breathing layer 1341 near the container body 210 is 3 μm, and the pore size of the breathing layer 1341 near the secondary breathing structure 140 is 0.1 μm, forming a pore size gradient. The larger pore size breathing layer 134 near the container body 210 can quickly accept a large number of gaseous water molecules, while the smaller pore size breathing layer 134 near the secondary breathing structure 140 can further block fine liquid water droplets, achieving adaptability to food with different humidity levels. It can quickly expel the large amount of water vapor generated by high humidity food, while maintaining a moderate seal for low humidity food, balancing good air permeability and sealing effect, and improving the versatility of the capping assembly 100.

[0059] The secondary breathing structure 140 and the supporting wall 111 are molded as one piece. They can be made of polycarbonate or polypropylene and have a plate-like structure to enhance the overall structural rigidity.

[0060] In one implementation, see Figure 1 and Figure 2The secondary breathing structure 140 has a pressure relief valve port 141 at its center. The pressure relief valve port 141 is a circular hole with a diameter of 5mm to 8mm. The pressure relief valve port 141 is equipped with an openable and closable valve cover 142. The valve cover 142 can be made of food-grade silicone and connected to the secondary breathing structure 140 through a hinge structure. Alternatively, it can be integrally injection molded with the secondary breathing structure 140 using a soft material (such as rubber or silicone).

[0061] Furthermore, the weight of the valve cover 142 can be designed to be 0.5g to 1g. When the air pressure inside the container is 0.01MPa to 0.02MPa higher than the external air pressure, the valve cover 142 can automatically open to release pressure and automatically close after the air pressure is balanced.

[0062] Furthermore, a pressure-stabilizing chamber 150 is formed between the inner walls of the primary breathing structure 130, the secondary breathing structure 140, and the supporting wall 111. The height of the pressure-stabilizing chamber 150 is any size between 5mm and 10mm, providing a dedicated condensation space for the discharged water vapor. Based on the principle of condensation of gaseous water molecules upon cooling, the water vapor condenses into liquid water in the chamber and is collected and stored, without contacting the food, thus avoiding food contamination and dilution of the food due to the condensed liquid water.

[0063] In another embodiment, two pressure relief valve ports 141 can be provided, symmetrically distributed on both sides of the secondary breathing structure 140. Each pressure relief valve port 141 is provided with a valve cover 142. The valve cover 142 is connected to the secondary breathing structure 140 through an elastic sheet. The elastic coefficient of the elastic sheet is designed to be in the range of 1N / m to 2N / m. When the air pressure in the container reaches the preset value, the two valve covers 142 open simultaneously to improve the pressure relief efficiency and prevent the sealing joint 120 from loosening due to excessive air pressure in the container.

[0064] This application also provides a food storage container 200, including a container body 210 and any of the above-mentioned sealing components 100; one end of the container body 210 has an opening 211 (see...). Figure 6 The cap assembly 100 covers the opening 211, and the sealing joint 120 is sealed to the edge sidewall of the opening 211 (see...). Figure 7 and Figure 8 ).

[0065] In one implementation, see Figures 6 to 8The container body 210 can be configured as a circular lunchbox, made of food-grade polypropylene. The inner diameter of the opening 211 is adapted to the outer diameter of the support wall 111 of the sealing assembly 100. The annular sealing ring of the sealing joint 120 fits tightly against the edge sidewall of the opening 211, achieving efficient heat preservation and reliable sealing. The folded edge 133 of the primary breathing structure 130 is clamped between the sealing joint 120 and the edge sidewall of the opening 211. The elastic pressure of the sealing joint 120 is used to firmly fix the folded edge 133, which not only improves the sealing fit between the primary breathing structure 130 and the opening 211 of the container body 210, but also allows for assembly and fixation without additional fixing structures, offering the advantages of convenient assembly and reliable sealing.

[0066] In another embodiment, the container body 210 is a square lunchbox (not shown), the opening 211 is square, the support wall 111 of the sealing assembly 100 is a square annular structure, and the sealing joint 120 is a square annular sealing ring adapted to the edge sidewall of the square opening 211. The primary breathing structure 130 is a square flexible membrane covering the square opening 211 of the container body 210, and the secondary breathing structure 140 is a square plate integrally formed with the support wall 111. The pressure relief valve port 141 is located at one corner of the secondary breathing structure 140 to prevent condensate dripping from contacting the pressure relief valve port 141.

[0067] The following section provides further explanation of the above technical solutions in conjunction with usage scenarios:

[0068] For example, a food delivery merchant needs to package and deliver a hot stir-fry or a bowl of soup noodles, using the food storage container 200 provided in this application. After the hot food is placed in the container body 210, the sealing assembly 100 is closed. The annular sealing ring of the sealing joint 120 fits tightly against the edge of the opening 211 of the container body 210, using the sealing structure to block the heat transfer path and achieve efficient heat preservation to maintain the temperature of the food. Water vapor emitted by the hot food accumulates in the container, and the air pressure gradually increases. Gaseous water molecules are smoothly discharged through the breathing holes of the primary breathing structure 130. The low surface energy chemical structure and micro-nano rough physical structure of the hydrophobic part 132 make it difficult for water molecules to wet and spread, and they can only form spherical water droplets that slide down the support wall 111 into the pressure stabilizing chamber 150. When the air pressure in the pressure stabilizing chamber 150 is higher than the external air pressure, the pressure can be released by opening the valve cover 142 of the pressure relief valve port 141. Water vapor is condensed and collected in the pressure-stabilizing chamber 150, preventing it from dripping back onto the food. This effectively preserves the dryness of stir-fries or the original flavor of soup noodles, solving the problem of food quality degradation caused by dew in traditional takeout containers.

[0069] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0070] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0071] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the 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 the utility model.

[0072] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0073] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0074] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A sealing assembly for a food storage container, characterized in that, include: A cover support frame, the cover support frame having a ring-shaped support wall, and one side edge of the support wall forming a sealing joint for sealing connection with the opening edge of the container body of the food storage container; A primary breathing structure is sealed to the inner wall surface of the support wall near the sealing joint, covering the opening of the container body; A secondary breathing structure is provided, located on the side of the primary breathing structure away from the sealing joint, and the primary and secondary breathing structures are spaced apart by a preset distance; furthermore... The primary breathing structure has at least one breathing part, each breathing part including multiple breathing holes with a diameter of 0.1μm to 3μm, and a hydrophobic part is provided on the side of the primary breathing structure facing the secondary breathing structure, and a pressure relief valve port is provided on the secondary breathing structure.

2. The sealing assembly of the food storage container as described in claim 1, characterized in that, The primary breathing structure can be bent relative to the support wall, and the edge of the primary breathing structure is bent toward the sealing joint to form a folded edge, which can be detachably and sealingly fitted to the inner wall surface of the support wall.

3. The sealing assembly of the food storage container as described in claim 2, characterized in that, One edge of the support wall has an annular retaining structure, and the sealing joint is an annular sealing ring that is engaged with the annular retaining structure.

4. The sealing assembly of the food storage container as described in claim 3, characterized in that, A pressure-stabilizing chamber is formed between the primary breathing structure, the secondary breathing structure, and the inner wall of the supporting wall, and an openable and closable valve cover is provided on the pressure relief valve port.

5. The sealing assembly of the food storage container as described in claim 1, characterized in that, The primary breathing structure includes multiple stacked breathing layers; wherein each breathing layer has at least one layer breathing portion, and the positions of the at least one layer breathing portion of each breathing layer are respectively corresponding in the stacking direction; wherein The porosity of the breathing pores in each of the breathing sections on each of the breathing layers is equal; and, among the plurality of breathing layers, in two adjacent breathing layers in the stacking direction, the porosity of the breathing section of the breathing layer closer to the secondary breathing structure is smaller than the porosity of the breathing section of the breathing layer closer to the container body.

6. The sealing assembly of the food storage container as described in claim 5, characterized in that, in The diameter of the breathing holes in each breathing section of each breathing layer is equal; and among the plurality of breathing layers, in two adjacent breathing layers in the stacking direction, the diameter of the breathing section of the breathing layer closer to the secondary breathing structure is smaller than the diameter of the breathing section of the breathing layer closer to the container body.

7. The sealing assembly of the food storage container as described in any one of claims 1 to 6, characterized in that, The primary breathing structure is a flexible membrane, the secondary breathing structure is a plate, and the secondary breathing structure is integrally formed with the supporting wall.

8. The sealing assembly of the food storage container as described in claim 7, characterized in that, The primary breathing structure is made of polytetrafluoroethylene, thermoplastic polyurethane, polyethylene, or polypropylene; and Both the secondary breathing structure and the supporting wall are made of polycarbonate or polypropylene.

9. A food storage container, comprising a container body, characterized in that, It also includes a sealing assembly for the food storage container according to any one of claims 1 to 8; wherein, One end of the container body has an opening, the cap assembly covers the opening, and the sealing joint is sealed to the edge sidewall of the opening.

10. The food storage container as described in claim 9, characterized in that, The folded edge of the primary breathing structure is held between the sealing joint and the edge sidewall of the opening.

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