reservoir

Abstract

The application provides a storage tank. The application relates to the technical field of storage equipment, and the tank body of the storage tank has a containing cavity. The tank body has a first tank opening and a second tank opening which are connected with the containing cavity. A tank cover is detachably connected with the first tank opening, and the tank cover is used for sealing or opening the first tank opening. A tank bottom is used for sealing the second tank opening. The tank bottom is provided with an exhaust hole which is connected with the containing cavity. A sealing layer covers and seals the exhaust hole. When the sealing layer is removed from the exhaust hole, the exhaust hole is used for releasing the negative pressure state between the side of the containing cavity which is towards the bottom of the tank body and the content. After the tank cover of the storage tank of the application is opened, the content can be easily poured out from the containing cavity.

Description

Technical Field

[0001] This application relates to the field of storage equipment technology, and more particularly to a storage tank. Background Technology

[0002] Metal cans or airtight containers are widely used in the packaging of food, beverages, and powders for encapsulating solid ingredients, frozen fruit pulp, jelly-like contents, and other contents with high viscosity or gel structure. These containers typically achieve airtight preservation through a sealed top cap. During sterilization, cooling, and long-term storage, a negative pressure environment easily forms between the contents and the inner wall and bottom of the can, producing an effect similar to "adsorption sealing."

[0003] However, in the aforementioned related technologies, the contents of the storage tank are difficult to pour out of the containing cavity after the lid is opened. Utility Model Content

[0004] This application provides a storage container to solve the technical problem in the above-mentioned related technologies where the contents of the storage container are difficult to pour out from the containing cavity after the lid is opened.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] This application provides a storage container, which includes:

[0007] A can body having a receiving cavity for containing contents; the can body having a first can opening and a second can opening communicating with the receiving cavity;

[0008] A can lid is detachably connected to the first can opening, and the can lid is used to seal or open the first can opening;

[0009] The bottom of the can is used to seal the second can opening, and the bottom of the can is provided with an exhaust hole, which is connected to the receiving cavity;

[0010] A sealing layer covers and seals the vent hole. When the sealing layer is removed from the vent hole, the vent hole serves to release the negative pressure between the side of the receiving cavity facing the bottom of the tank and the contents.

[0011] This application provides a storage container with an exhaust vent at the bottom that communicates with the container cavity. The container is initially sealed by a sealing layer. After the user removes the sealing layer, outside air enters the container through the exhaust vent, breaking the negative pressure adsorption state between the bottom of the container and the contents. This solves the problem that traditional storage containers still have difficulty pouring out the contents due to the negative pressure at the bottom after opening, significantly improving the smoothness of pouring and the convenience of use.

[0012] In one possible implementation, the exhaust ports include a plurality of ports arranged at intervals.

[0013] In one possible implementation, the diameter of the vent hole is greater than or equal to 1 mm and less than or equal to 20 mm.

[0014] In one possible implementation, a plurality of the vent holes are arranged at circumferential intervals along the bottom of the tank and positioned near the central region of the bottom of the tank.

[0015] In one possible implementation, the inner edge of the vent is covered with a corrosion-resistant layer.

[0016] In one possible implementation, the inner edge of the vent hole is provided with an inwardly rolled circular structure that curls toward the interior of the receiving cavity.

[0017] In one possible implementation, the outline shape of the vent is one of a circle, rectangle, square, ellipse, or irregular shape.

[0018] In one possible implementation, the corrosion-resistant layer is an epoxy resin layer or a polyurethane layer.

[0019] In one possible implementation, the sealing layer includes a sealing portion and an opening portion;

[0020] The sealing part is connected to the outer surface of the bottom of the tank and is used to completely cover and seal the vent hole;

[0021] The opening part is connected to one end of the sealing part and is spaced apart from the surface of the bottom of the tank. The opening part is used to drive the sealing part to separate from the bottom of the tank under the action of external force.

[0022] In one possible implementation, the sealing layer is a metal sealing layer or a plastic sealing layer. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a storage tank provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 Exploded view of the storage tank in the image;

[0026] Figure 3 for Figure 2 An exploded view of the storage tank from another perspective;

[0027] Figure 4 An exploded view of a second type of storage tank provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Tank body;

[0030] 110. Receiving cavity; 120. First can opening; 130. Second can opening;

[0031] 200. Can lid;

[0032] 300. Bottom of the can;

[0033] 310. Vent hole;

[0034] 400. Sealing layer;

[0035] 410. Sealing part; 420. Opening part;

[0036] 500, Inwardly rolled circular structure. Detailed Implementation

[0037] As described in the background section, in the aforementioned related technologies, the contents of the storage container are difficult to pour out of the cavity after the lid is opened.

[0038] The reason for this problem is that some existing designs have attempted to alleviate it by adding an exhaust channel to the tank structure, such as setting a through hole at the bottom of the tank and using a sealing membrane for protection, so as to introduce air and balance the air pressure before use.

[0039] However, traditional canister structures often fail to consider the release of negative pressure at the bottom of the can. Simply opening the top lid cannot effectively break the vacuum adhesion between the contents and the bottom, resulting in difficulty in pouring, significant residue buildup, and a negative impact on user experience. Furthermore, improperly designed vents can lead to problems such as increased manufacturing difficulty, poor sealing, metal edge corrosion, or inconvenience for users. Therefore, a structurally sound, user-friendly, and safe solution is urgently needed.

[0040] To address the aforementioned issues, this application provides a storage container with an exhaust vent at the bottom that communicates with the container cavity. An initial seal is achieved through a sealing layer. After the user removes the sealing layer, outside air enters the container through the exhaust vent, breaking the negative pressure adsorption between the bottom and the contents. This solves the problem of difficulty in emptying contents due to the negative pressure at the bottom after opening traditional storage containers, significantly improving the smoothness of emptying and ease of use.

[0041] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] refer to Figure 1 , Figure 2 and Figure 3 This application provides a storage container, which may include a container body 100, a container lid 200, a container bottom 300, and a sealing layer 400.

[0043] The can body 100 has a receiving cavity 110 for receiving contents; the can body 100 has a first opening 120 and a second opening 130 communicating with the receiving cavity 110. A can lid 200 is detachably connected to the first opening 120 and is used to seal or open the first opening 120. A can bottom 300 is used to seal the second opening 130, and the can bottom 300 has a vent 310 communicating with the receiving cavity 110. A sealing layer 400 covers and seals the vent 310; when the sealing layer 400 is removed from the vent 310, the vent 310 releases the negative pressure between the contents and the side of the receiving cavity 110 facing the bottom of the can body 100.

[0044] This application provides a storage container with a reasonable structure and convenient operation. By setting a controllable venting channel at the bottom 300 of the container, and in conjunction with a removable sealing layer 400, the negative pressure inside the container can be effectively released. The core of this solution lies in integrating the venting function into the area of ​​the bottom 300 of the container, precisely breaking the local negative pressure formed between the contents and the bottom 300, thereby improving the smoothness of pouring. Its working principle is as follows: In the sealed state, the vent 310 is completely sealed by the sealing layer 400, ensuring that the contents are not affected by external moisture, oxygen or impurities during storage; when the user needs to pour out the contents, simply remove the sealing layer 400, exposing the vent 310 and connecting it to the outside atmosphere. External air then enters the bottom area of ​​the receiving cavity 110 through the vent 310, breaking the original negative pressure environment, eliminating the adsorption force between the contents and the bottom 300 of the container, and thus achieving smooth pouring.

[0045] The tank body 100 serves as the main structural support, forming a closed cavity 110 to hold various contents. The tank body 100 is typically made of metal (such as tinplate or aluminum) or high-temperature resistant plastic, possessing good mechanical strength and sealing performance. The cavity 110 extends through the interior of the tank body 100, and its shape can be designed as cylindrical, square, or other adaptable forms to suit different filling process requirements, depending on the characteristics of the contents. The first opening 120 is located at the top of the tank body 100, primarily used for filling and dispensing contents, while the second opening 130 is located at the bottom of the tank body 100, used to install the tank bottom 300 and provide space for a venting structure. The two openings are located at opposite ends of the tank body 100, forming a double-ended opening structure, facilitating processing, molding, and subsequent component assembly.

[0046] The can lid 200 and the first can opening 120 are connected by a detachable method, such as a roll-on connection, threaded connection, snap-fit ​​connection, or rotation locking structure, allowing for repeated sealing and opening of the first can opening 120. The can lid 200 can be made of metal or engineering plastic, and its surface can be enhanced with anti-slip textures or markings to improve ease of use and product aesthetics. In the closed state, an elastic sealing ring or gasket is provided between the can lid 200 and the first can opening 120 to ensure reliable sealing and prevent leakage of contents or intrusion of external contaminants.

[0047] The tank bottom 300 is used to seal the second tank opening 130, forming the bottom boundary of the receiving cavity 110. It can be fixed to the bottom end of the tank body 100 by welding, rolling, or bonding, ensuring a firm and reliable seal. At least one vent hole 310 is provided on the tank bottom 300, extending from the outer surface to the inner surface and directly communicating with the receiving cavity 110, serving as a key channel for gas flow. The vent hole 310 is preferably located in the central area or near the center of the tank bottom 300 to facilitate uniform gas entry and rapid pressure equalization. The number of vent holes 310 can be single or multiple, and the specific number can be flexibly adjusted according to the volume of the tank body 100, the properties of the contents, and the required venting efficiency.

[0048] A sealing layer 400 covers the outside of the can bottom 300 and completely covers the vent 310 area, effectively isolating it from the external environment. This sealing layer 400 is fixedly connected to the surface of the can bottom 300 by heat pressing, adhesive bonding, or electrostatic adsorption, providing excellent airtightness and waterproofing. Its material can be a metal foil composite film, plastic film, or multi-layer composite barrier material, effectively preventing moisture and oxygen penetration while possessing sufficient mechanical strength to withstand minor scratches during transportation. When the user needs to use the contents, they can manually peel off the sealing layer 400, exposing the vent 310 to the air to complete the venting process. The design of the sealing layer 400 ensures that the can remains sealed before normal use, guaranteeing the stability of the contents.

[0049] The aforementioned components work together to form a complete exhaust control system. The tank body 100 provides the storage space, the tank cover 200 controls the opening and closing of the top, the tank bottom 300 integrates the exhaust structure, and the sealing layer 400 enables the controllable opening and closing of the exhaust port 310. The entire system requires no additional drive device or complex mechanism, achieving efficient negative pressure relief through a simple structural combination.

[0050] Through the above technical solution, this application realizes a storage container that can actively release the negative pressure at the bottom 300 before pouring. Because an exhaust port 310 communicating with the receiving cavity 110 is provided at the bottom 300, and it is sealed by a removable sealing layer 400, after opening the lid 200, further introduction of external air by removing the sealing layer 400 can effectively break the negative pressure adsorption state between the contents and the bottom 300. Therefore, it solves the technical problem of traditional storage containers where residual negative pressure at the bottom makes it difficult to pour the contents, improving the product's practicality and user experience. This solution is particularly suitable for packaging scenarios containing contents with high viscosity, gel-like, or easily adsorbed properties, and has broad applicability and market application prospects.

[0051] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the exhaust port 310 may include multiple exhaust ports 310 arranged at intervals.

[0052] This application improves the exhaust response speed and overall exhaust capacity by setting multiple spaced exhaust holes 310. However, the ventilation capacity of a single exhaust hole 310 is limited by its aperture size and local flow field conditions. When dealing with large volumes or highly viscous contents, relying solely on a single exhaust channel may lead to poor air intake and delayed pressure balance, thus affecting the smoothness of contents dumping. To overcome this limitation, this application adopts a multi-hole parallel arrangement, allowing outside air to simultaneously enter the bottom region of the receiving cavity 110 through multiple independent channels, thereby accelerating the process of releasing the negative pressure state inside the tank 100.

[0053] The number of vent holes 310 is not limited to a specific value, as long as it meets the basic requirements of "multiple" and "spaced apart". For example, it can be 2, 3, 4 or even more. The specific number can be adjusted according to the capacity of the tank 100, the characteristics of the contents and the expected exhaust rate. A certain distance is maintained between the multiple vent holes 310 to avoid a decrease in local structural strength or poor adhesion of the sealing layer 400 due to excessive density. At the same time, a reasonable distribution of holes helps to achieve a more uniform gas entry path and reduce local eddies or blockages.

[0054] As an optional embodiment, the multiple vents 310 can be arranged in a ring array along the circumference of the tank bottom 300, forming a symmetrical layout. This is beneficial for mold processing and automated production, and also improves the regularity of the product's appearance. In another variation, the multiple vents 310 can also be arranged asymmetrically in an area near the center of the tank bottom 300 to adapt to the specific accumulation pattern of the contents, preferentially introducing air from the central area to promote overall detachment. Furthermore, the diameter of each vent 310 can be the same, or it can be designed with different size combinations, such as a slightly larger central hole and slightly smaller peripheral holes, to adjust the air intake flow distribution at each point and optimize the overall exhaust dynamic performance.

[0055] Multiple vent holes 310 and the tank bottom 300 form an integrated structure, and their edge treatment can be flexibly selected according to material type and process conditions. For metal tanks 100, the openings can be rolled inward after punching, so that the cut edges are rolled into a smooth ring structure inside the receiving cavity 110, avoiding sharp burrs from contacting the contents, while enhancing the deformation resistance around the holes; alternatively, a corrosion-resistant coating, such as epoxy resin or polyurethane, can be applied to the surface of the hole area to prevent direct contact between the metal substrate and the contents, thus preventing electrochemical corrosion. For plastic tanks 100, the vent holes 310 can be integrally molded by injection molding without subsequent processing, and a self-reinforcing effect can be achieved through structural design.

[0056] All vent holes 310 are connected to the same sealing layer 400, which covers all vent holes 310 and is tightly bonded to its surrounding area to achieve an overall seal. Users only need to remove the sealing layer 400 to open all vent channels simultaneously, making the operation simple and efficient.

[0057] Through the above technical solution, this application realizes a multi-channel synchronous air intake mechanism. By setting multiple spaced exhaust holes 310, the total ventilation area is significantly increased, allowing external air to enter the receiving cavity 110 from multiple positions simultaneously. This quickly compensates for the pressure difference formed by vacuum adsorption on the bottom 300 side of the tank, thereby effectively shortening the negative pressure release time. Especially when the contents have high adhesion or gel-like characteristics, multi-point air intake can break the phenomenon of local adsorption force concentration, causing the contents to loosen as a whole and then smoothly pour out from the first tank opening 120. This solves the technical problem that traditional storage tanks still have bottom negative pressure after opening, which makes it difficult to pour the contents, and improves the practicality of the product and the user experience.

[0058] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the diameter of the vent 310 is greater than or equal to 1 mm and less than or equal to 20 mm.

[0059] This application addresses the challenges of limiting the size range of the vent hole 310, ensuring effective venting while also considering manufacturing feasibility and structural reliability. This technical approach primarily solves problems such as processing difficulties, sealing failures, or poor venting caused by unreasonable vent hole 310 dimensions during the use of storage containers. Especially when the contents are foods with a certain degree of viscosity or solidification (such as jelly, fruit puree, sauces, etc.), if a negative pressure exists at the bottom of the container 100 and cannot be released in time, it will be difficult to pour the contents smoothly even after opening the lid 200. Conversely, if the vent hole 310 is too small, it will require excessively high processing precision or have insufficient ventilation capacity, affecting the efficiency of negative pressure release. Furthermore, if the diameter is too large, it may cause the sealing layer 400 to be insecurely covered, leading to localized stress concentration, easy breakage, or an increased risk of leakage. Therefore, rationally setting the geometric dimensions of the vent hole 310 is crucial for achieving stable, safe, and convenient venting operations.

[0060] The diameter of the vent 310 is limited to not less than 1 mm and less than or equal to 20 mm. This size range is a selectable range derived by comprehensively considering the adaptability of processing technology, material properties, sealing reliability, and actual usage requirements. Specifically, when the diameter of the vent 310 is less than 1 mm, on the one hand, the requirements for mold precision and equipment stability in the metal punching process are significantly increased, the scrap rate increases, and processing costs increase; on the other hand, the excessively small flow cross-sectional area will limit the air inflow velocity, resulting in a slow internal and external air pressure balance process, affecting the user's immediate pouring experience. When the diameter exceeds 20 mm, although the ventilation capacity is enhanced, new problems arise: first, the sealing layer 400 requires a larger area to adhere, resulting in uneven edge stress, which can easily lead to local peeling or tearing during transportation or storage; second, opening large holes in the curved or planar transition area of ​​the bottom 300 of the can may lead to a decrease in structural strength, especially causing micro-deformation during heat treatment processes such as sterilization and cooling, thus affecting the integrity of the seal; third, larger openings may allow the contents to come into contact with the edge of the vent 310 when inverted or vibrating, increasing the risk of leakage or contamination.

[0061] To support the broad applicability of this parameter range, this application also covers a variety of alternative implementation methods. For example, in some applications requiring high exhaust response speed, multiple circular exhaust holes 310 with a diameter of 4 mm can be evenly distributed in the central area of ​​the tank bottom 300 to increase the total flow area without excessively weakening the structural strength. In long-shelf-life products with more stringent requirements for sealing durability, a 6 mm diameter hole combined with an inwardly rolled circular structure 500 and an epoxy resin coating can be selected to further enhance impact resistance and corrosion resistance. In addition, the outline shape of the exhaust hole 310 can be selected as circular, elliptical, rectangular, or other regular or irregular shapes according to actual needs, as long as its equivalent diameter falls within the range of 1 mm to 20 mm to achieve similar technical effects. For example, an elliptical hole with a major axis of 10 mm and a minor axis of 3 mm still meets the minimum ventilation requirements in terms of minimum cross-sectional dimensions, while space utilization can be optimized by adjusting the directional layout.

[0062] Through the above technical solution, this application achieves a scientific definition of the size of the vent hole 310. By controlling the diameter of the vent hole 310 between 1mm and 20mm, the problems of high processing difficulty and low venting efficiency caused by an excessively small diameter are avoided, while the problems of difficulty in covering the sealing layer 400, easy damage, and potential leakage risks caused by an excessively large diameter are also prevented. Therefore, without affecting the overall sealing performance of the storage tank, the stability and practicality of the venting function are effectively improved, thereby improving the user's operational convenience when pouring out the contents after opening.

[0063] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, a plurality of vent holes 310 are arranged at intervals along the circumference of the tank bottom 300 and are located near the central region of the tank bottom 300.

[0064] The relative positions of the exhaust ports 310 are closely related to their functions: the circumferential spacing ensures the diversity of air intake directions, preventing airflow from concentrating on one side and causing uneven disturbance of the contents; while the arrangement near the center optimizes the spatial matching of the pressure release point, allowing air to quickly penetrate to the interface between the contents and the tank wall. The combined effect of these two factors ensures the smoothness of the exhaust process and improves the ease of use after opening.

[0065] Through the above technical solution, this application achieves a reasonable spatial configuration of multiple vent holes 310 on the tank bottom 300. Because the vent holes 310 are distributed circumferentially and concentrated in the central area, outside air can enter the receiving cavity 110 evenly from different directions, effectively alleviating the problem of content adsorption caused by local negative pressure at the tank bottom 300, while avoiding material tilting or splashing caused by eccentric air intake. Furthermore, because this layout is compatible with the structural features of the tank body 100, it simplifies the processing flow and improves the feasibility of mass production. Therefore, it achieves the technical effects of more uniform venting, simplified process, and aesthetically pleasing structure.

[0066] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the inner edge of the vent 310 is covered with a corrosion-resistant layer.

[0067] This embodiment provides a technical solution for preventing internal corrosion of storage tanks. The core of this solution lies in setting a corrosion-resistant layer on the inner edge of the vent 310 to prevent direct contact between the contents and the metal substrate. Since storage tanks are commonly used to hold food, beverages, or corrosive powders, especially during long-term storage, if the tank body 100 is made of metal (such as tinplate, aluminum, or aluminum alloy), the exposed metal cutouts after processing the vent 310 are highly susceptible to electrochemical reactions with moisture, acidic components, or other electrolytes in the contents, leading to localized corrosion or even perforation, thereby affecting the container's sealing performance and the safety of the contents. Therefore, adding a corrosion-resistant layer to this critical part, the vent 310, is an important means of improving product reliability and food safety performance.

[0068] The vent 310 is usually formed on the bottom of the metal can 300 by stamping or laser cutting. During the processing, an exposed metal surface is formed on the hole wall, especially at the inner edge of the hole where there are micro-burrs or exposed grain boundaries. These locations are more likely to become corrosion initiation points.

[0069] The inner edge specifically refers to the boundary line of the vent 310 wall that forms when it penetrates the tank bottom 300, facing the receiving cavity 110; that is, the innermost contour where the vent meets the internal space of the tank body 100. This area directly faces the contents and, due to manufacturing limitations, is difficult to completely passivate, making it a high-risk area for corrosion. Therefore, specialized protection for this area is of great importance.

[0070] The corrosion-resistant layer is a functional coating or film structure attached to the inner edge surface of the vent 310. Its main function is to act as a physical and chemical barrier, preventing corrosive media (such as organic acids, salts, and moisture) in the contents from contacting the underlying metal. This corrosion-resistant layer can be applied to the inner edge of the vent 310 by spraying, dip coating, electrophoretic deposition, or thermosetting, ensuring good adhesion and continuity with the metal substrate to avoid defects such as pinholes and cracks. Optionally, the corrosion-resistant layer should possess excellent resistance to damp heat, peel resistance, and food-grade safety.

[0071] As an alternative implementation, the corrosion-resistant layer can be made of epoxy resin, which has a dense cross-linked structure, providing strong barrier properties against water vapor and ion penetration, while forming a stable chemical bond with the metal surface, making it suitable for long-term stable use under high-temperature sterilization environments. Another feasible alternative is a polyurethane coating, which offers advantages such as better flexibility, allowing it to withstand slight deformation of the tank 100 during transportation without cracking, and excellent resistance to chemical media.

[0072] In addition, other known food-grade preservative coatings, such as phenolic resins, acrylic copolymers, or inorganic oxide composite coatings, can also be considered, as long as they achieve the same function, they can be covered within the protection scope of this embodiment.

[0073] The synergistic effect between the various structures is as follows: the presence of the vent 310 provides a passage for relieving negative pressure, while its inner edge inevitably exposes the metal material due to the processing; the corrosion-resistant layer specifically covers this high-risk area, effectively inhibiting the corrosion process without affecting the venting function, thereby ensuring the structural integrity and safety of the contents of the storage tank throughout its entire life cycle.

[0074] Through the above technical solution, this application achieves the goal of significantly improving the corrosion resistance of the vent 310 without changing its basic structure and function. Because a corrosion-resistant layer is provided covering the inner edge of the vent 310, the direct contact path between the contents and the exposed metal is blocked, reducing the possibility of electrochemical corrosion. Therefore, problems such as shortened tank life and contamination of contents caused by localized corrosion are solved, improving the product's durability and food safety level.

[0075] refer to Figure 4 In some embodiments, the inner edge of the vent 310 is provided with an inwardly rolled circular structure 500 that curls toward the interior of the receiving cavity 110.

[0076] In this embodiment, by providing an inwardly rolled circular structure 500 that curls towards the interior of the receiving cavity 110 at the inner edge of the vent hole 310, structural reinforcement and safety protection of the vent hole 310 area are achieved. This technique not only improves local mechanical strength and prevents deformation of the vent hole 310 due to external forces from affecting the sealing integrity, but also effectively avoids the corrosion risk and safety hazards caused by direct exposure of the metal cut to the contents. The inwardly rolled circular structure 500 refers to the uniform rolling of the metal material at the edge of the vent hole 310 towards the interior of the tank 100 along its circumference after punching, forming a smooth, closed annular rolled edge. This rolled edge has no sharp burrs and a continuous, complete surface.

[0077] The vent 310 is a through-hole formed on the can bottom 300 by a stamping process. It is typically located near the center of the can bottom 300 and can be arranged singly or in multiple spaced intervals. During the stamping process, a metal cut surface is created at the hole edge. If left untreated, this exposes the base metal, making it susceptible to chemical reactions with the contents, especially when containing acidic foods (such as juice or jam), which can easily lead to electrochemical corrosion. Furthermore, the exposed sharp edges can scratch operators or damage the packaging material during transportation. Therefore, adopting an inwardly rolled circular structure 500 becomes an effective physical modification method: after stamping, a die is used to apply radial pressure to the edge of the hole, causing the metal edge to bend inward and roll into a closed arc-shaped structure, ultimately forming the inwardly rolled circular structure 500. This structure completely encloses the cut, which was originally perpendicular to the plane of the can bottom 300, within the rolled portion, thus achieving masking of the metal base material.

[0078] The curling direction of the inwardly rolled circular structure 500 is strictly limited to the interior of the receiving cavity 110 to ensure that the external environment cannot directly contact the cut surface, and also to prevent the rolled edge from turning outward and causing poor adhesion of the sealing layer 400. In specific implementation, the inwardly rolled circular structure 500 can be completed through a one-time forming process, that is, the edge is rolled while punching, or it can be implemented in stages, with the edge rolling action completed by a secondary forming mold after punching. This structure is suitable for vent holes 310 with circular, elliptical, or other regular shapes, and is especially suitable for designs with a hole diameter in the range of 3mm to 8mm, which can ensure sufficient venting flow area and facilitate the stable execution of the rolling process.

[0079] As one of the optional implementation methods, when the tank body 100 is made of aluminum or aluminum alloy, its good ductility allows for uniform inward rolling under lower pressure, reducing mold wear. Additionally, in some variations, after completing the inward-rolled circular structure 500, a corrosion-resistant coating (such as epoxy resin or polyurethane) can be applied to its surface to provide double protection; however, this is not a necessary feature, as the inward-rolled structure itself already possesses good corrosion resistance.

[0080] The connection relationships and functions between the components are as follows: The vent 310 serves as a gas passage through the bottom of the tank 300. The inwardly rolled circular structure 500 on its edge changes the geometry of the vent, transforming it from an open cut to a closed rolled edge. This change in shape directly affects the adhesion stability of the sealing layer 400. Since the rolled edge surface is smooth and without protrusions, it is beneficial for the sealing layer 400 (such as plastic film or metal foil) to adhere evenly, thus improving the sealing reliability. At the same time, during the filling, sterilization, and storage of contents, this structure can resist the local stress concentration caused by the internal and external pressure difference, prevent depressions or warping around the vent 310, and maintain the overall flatness of the bottom of the tank 300.

[0081] Through the above technical solution, this application achieves a safer and more functional modification of the edge of the vent hole 310. Because an inwardly rolled circular structure 500 is provided, curving towards the interior of the receiving cavity 110, the metal cut produced by the punching is effectively covered. This eliminates the safety risks posed by sharp edges and blocks the contact path between the contents and the exposed metal, thus solving the problem of sealing failure and content contamination caused by orifice corrosion or structural deformation during long-term storage of traditional storage tanks. Simultaneously, this structure enhances the pressure resistance and mechanical stability of the vent hole 310 area, making it less prone to deformation under conditions such as transportation, stacking, or drops, thereby ensuring the reliability of the venting function and the safety of use.

[0082] refer to Figure 4 In some embodiments, the outline shape of the vent 310 is one of a circle, rectangle, square, ellipse or irregular shape.

[0083] This embodiment provides a technical solution for providing vent holes 310 with various selectable contour shapes at the bottom 300 of a storage tank. By allowing the vent holes 310 to adopt different geometric shapes, the flexibility of product design and the adaptability of manufacturing processes are improved. The vent hole 310, as a key structure for achieving pressure balance inside and outside the tank 100, directly affects the processing method, the adhesion effect of the sealing layer 400, and the overall appearance. In this embodiment, the "vent hole 310" refers to a through-hole structure opened at the bottom 300 and connecting to the receiving cavity 110, used to allow outside air to enter the tank after the sealing layer 400 is removed, thereby relieving the negative pressure state between the bottom 300 side and the contents.

[0084] The outline shape of the vent 310 can be selected from one of the following: circular, rectangular, square, elliptical, or irregular. Circular vents 310 offer advantages such as uniform stress distribution, good stamping formability, and resistance to edge cracking, making them suitable for conventional high-speed stamping processes, especially for mass automated production scenarios. Rectangular or square vents 310 can provide a larger opening perimeter within the same area, which helps increase the air intake rate per unit time and facilitates array arrangement in limited spaces, improving space utilization. Elliptical vents 310 combine the structural stability of circular holes with the flow advantages of elongated holes, extending the gas flow path in the axial direction and helping to mitigate airflow impact, making them suitable for applications requiring high exhaust stability. Irregularly shaped vents 310 can be customized according to specific mold conditions or brand identification needs, such as using petal-shaped, star-shaped, or polygonal combinations for aesthetic purposes, satisfying functional requirements while enhancing product visual recognition and market differentiation competitiveness.

[0085] Through the above technical solutions, this application has achieved diversified design of the outline shape of the vent 310. Since the appropriate shape can be freely selected according to the manufacturing equipment capabilities, material characteristics and product positioning, it solves the problem of design rigidity and process limitation caused by the fixed shape of the vent 310, thereby improving the adaptability of the storage tank in different application scenarios and enhancing the product's freedom in structural design and appearance presentation, ultimately achieving the technical effect of improving user experience and market competitiveness.

[0086] refer to Figure 4 In some embodiments, the corrosion-resistant layer is an epoxy resin layer or a polyurethane layer.

[0087] The epoxy resin layer is a cross-linked network film formed by coating, drying, and thermosetting epoxy resin as the main component, combined with curing agents, diluents, and additives. Its molecular structure contains a large number of polar groups and reactive epoxy groups, enabling it to form strong chemical bonds and physical adsorption with metal surfaces, resulting in excellent adhesion strength and peel resistance. This material exhibits good thermal stability and hydrolysis resistance during high-temperature sterilization, making it particularly suitable for canned products requiring 121℃ steam sterilization. Furthermore, the epoxy resin layer has high hardness and good wear resistance, effectively resisting mechanical scratches during filling, sealing, and transportation, ensuring the integrity of the coating.

[0088] The polyurethane layer is a highly elastic polymer coating synthesized primarily from isocyanate and polyol. It can be applied to the vent 310 area by spraying, dipping, or roller coating and cured into a film at room temperature or by heating. This coating has excellent flexibility and impact resistance, and can remain uncracked and undetached when the can 100 is subjected to external deformation. It is particularly suitable for product packaging that needs to withstand complex transportation conditions such as vibration and drops.

[0089] As an optional embodiment, the corrosion-resistant layer can also adopt other organic coating systems with similar protective functions, such as phenolic resin layers, acrylic resin layers, or fluorocarbon coatings, as long as they meet food safety requirements and have sufficient adhesion and corrosion resistance.

[0090] Through the above technical solution, this application achieves comprehensive protection of the metal edge of the vent 310 area. By using chemically stable and highly adhesive epoxy resin or polyurethane as the corrosion-resistant layer material, the storage tank, when containing corrosive contents, can significantly reduce the food safety risks caused by metal ion leaching and the probability of localized corrosion failure of the tank body 100.

[0091] refer to Figure 1 and Figure 3 In some embodiments, the sealing layer 400 may include a sealing portion 410 and an opening portion 420. The sealing portion 410 is connected to the outer surface of the tank bottom 300 and is used to completely cover and seal the vent 310. The opening portion 420 is connected to one end of the sealing portion 410 and is spaced apart from the surface of the tank bottom 300. The opening portion 420 is used to separate the sealing portion 410 from the tank bottom 300 under the action of external force.

[0092] This application achieves effective sealing and convenient opening of the vent 310 by designing the sealing layer 400 as a composite structure comprising a sealing part 410 and an opening part 420. This ensures the airtightness of the storage tank during storage and significantly improves the convenience of user operation. The sealing part 410, as the core area for achieving the sealing function, must meet the requirements for long-term stable sealing in terms of material, size, and bonding method. The opening part 420, as a key structure for human-machine interaction, undertakes the functions of force guidance and peeling initiation. The two work together to allow users to complete the venting preparation process without the need for tools.

[0093] The sealing part 410 refers to the portion that directly contacts and is firmly connected to the outer surface of the tank bottom 300. Its shape is adapted to the overall layout of the vent holes 310 group, and it can completely cover all vent hole 310 areas, ensuring effective isolation between the receiving cavity 110 and the outside world. In practical applications, the sealing part 410 can be fixed to the surface of the tank bottom 300 by means of hot pressing, ultrasonic welding, or coating with pressure-sensitive adhesive, ensuring that it will not warp or fall off due to vibration or temperature and humidity changes during transportation and storage. In addition, to enhance the sealing reliability, the edge of the sealing part 410 can be designed as a widened edge structure to further increase the bonding area and improve the peel resistance.

[0094] The opening portion 420 is a cantilever structure connected to one end of the sealing portion 410 but maintaining a gap with the surface of the can bottom 300. Its main function is to provide the user with a clear gripping position and initial force point. This portion is usually tilted upwards or partially detached from the surface of the can bottom 300 by a supporting structure, forming an operating end that is easy to grip with fingers. The length of the opening portion 420 is generally not less than 10mm, so that adults and those with weaker hand strength (such as the elderly) can easily reach it; its width can be adjusted according to the overall packaging size, usually between 5mm and 20mm, providing sufficient gripping area while avoiding excessive occupation of the space in the can bottom 300. In some optional embodiments, the surface of the opening portion 420 may be provided with anti-slip texture, raised buttons, or color markings to enhance tactile feedback and visual cues, further optimizing the user experience. When the user applies an outward pulling force, the opening portion 420 transfers stress to the sealing portion 410, triggering the gradual separation of the adhesive interface, ultimately achieving the overall peeling of the entire sealing layer 400 from the vent 310 area.

[0095] The sealing part 410 and the opening part 420 are typically integrally molded structures, cut and processed from the same continuous material to ensure the connection strength and consistency of operation between the two. This integrated design avoids the process complexity and potential failure risks associated with assembling multiple parts. In some variations, a split structure can also be adopted, where the sealing part 410 and the opening part 420 are manufactured separately and then connected by spot welding, riveting, or partial bonding, suitable for applications with special requirements for adjusting the opening force. Regardless of the structural form, the non-contact state between the opening part 420 and the bottom of the can 300 must be ensured. This can be achieved through pre-set creases, elastic support plates, or small pads to physically lift the opening part, preventing accidental adhesion during storage that could make it difficult to open.

[0096] The aforementioned components together constitute a fully functional and user-friendly venting and opening system. When the user needs to empty the contents, they simply pinch the opening part 420 with their fingers and gently pull outwards to trigger the overall peeling process of the sealing layer 400. As the sealing part 410 gradually detaches from the surface of the can bottom 300, the previously sealed vent 310 is exposed, allowing outside air to enter the bottom of the receiving cavity 110 through the vent 310, breaking the negative pressure environment inside the can and eliminating the "adsorption seal" effect between the contents and the can wall, thereby significantly reducing pouring resistance. This process requires no rotation, prying, or other complex operations, conforming to daily usage habits and is especially suitable for efficient use in fast-paced environments such as kitchens and catering services.

[0097] Through the above technical solution, this application achieves a user-friendly improvement to the opening operation of the sealing layer 400. Because an independent and suspended opening part 420 is provided, users can intuitively identify and conveniently apply pulling force to drive the sealing part 410 to overcome adhesive force and achieve overall peeling. Since the sealing part 410 and the opening part 420 form a continuous force path, the stress distribution is uniform, avoiding localized tearing or residue. Therefore, it achieves the technical effect of quickly and reliably releasing the negative pressure state, solving the problems of difficult opening and inconvenient operation existing in traditional sealing structures.

[0098] refer to Figure 4 In some embodiments, the sealing layer 400 is a metal sealing layer or a plastic sealing layer.

[0099] The sealing layer 400, as a key functional component covering and sealing the vent 310, is mainly used to isolate the external environment from the containing cavity 110 when the storage tank is sealed, preventing moisture, oxygen, or impurities from entering and causing the contents to deteriorate. When the user needs to empty the contents, the sealing layer 400 is removed, allowing the vent 310 to allow outside air to pass through, thereby relieving the negative pressure state between the bottom 300 side of the tank and the contents caused by cooling or storage, facilitating the smooth pouring of the contents from the first opening 120.

[0100] The sealing layer 400 includes optional material types: a metal sealing layer or a plastic sealing layer. The metal sealing layer typically uses a thin metal foil material with good ductility and barrier properties, such as aluminum foil or aluminized composite film, with a thickness ranging from 0.05mm to 0.5mm (all related details for 0.05mm-0.5mm need to be changed), optionally 0.5mm, to balance sealing performance and ease of tearing. Furthermore, the metal sealing layer can form a good adhesive interface with corrosion-resistant coatings such as epoxy resin or polyurethane layers, ensuring no peeling or leakage during long-term storage.

[0101] The plastic sealing layer can be made of flexible polymer film materials, such as polyethylene (PE), polyethylene terephthalate (PET), or biaxially oriented polypropylene (BOPP), with a thickness generally controlled between 0.05 mm and 0.5 mm. These materials are low-cost, easy to process and mold, and possess good flexibility and tear resistance, making them particularly suitable for use with the 420 opening design to achieve easy manual opening.

[0102] Plastic sealing layers offer superior ease of handling at room temperature or low temperatures, making them suitable for packaging non-high-temperature sterilized products such as jelly, yogurt, and sauces.

[0103] In practical applications, the appropriate sealing layer material can be selected based on different product requirements: for foods requiring high-temperature sterilization and with high shelf-life requirements, metal sealing layers are preferred to ensure airtightness and chemical stability; while for consumer products that prioritize ease of opening and cost control, plastic sealing layer solutions are more suitable. Both materials can be firmly bonded to the surface of the can bottom 300 using adhesives, and their edge areas can be reinforced with a pressing process to prevent accidental lifting or damage during transportation.

[0104] Through the above technical solution, this application achieves a technical path for flexibly configuring the sealing layer 400 material according to different usage environments and process conditions. Because the sealing layer 400 uses two representative material systems—metal and plastic—it solves the technical problem that a single material cannot simultaneously ensure thermal stability, sealing reliability, and ease of operation. Therefore, it achieves the technical effect of broadening the product's applicability and improving user experience and packaging adaptability. For example, under high-temperature sterilization conditions, the metal sealing layer effectively maintains the integrity of the seal, preventing oxidation and deterioration of the contents; while in daily opening processes, the plastic sealing layer, due to its flexibility, significantly reduces the difficulty of opening. Especially when combined with the opening part 420 with a suspended section, users only need to pinch it with their fingers to complete the peeling action, improving the overall convenience and safety of use.

[0105] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0106] It should be noted that phrases such as "in particular implementation," "in some embodiments," "in this embodiment," and "exemplarily" used in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases may not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure, or characteristic in conjunction with embodiments, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0107] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0108] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0109] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A storage container, characterized in that, include: The can body (100) has a receiving cavity (110) for receiving contents; the can body (100) has a first opening (120) and a second opening (130) communicating with the receiving cavity (110); A can lid (200) is detachably connected to the first can opening (120), and the can lid (200) is used to seal or open the first can opening (120); The bottom of the can (300) is used to seal the second can opening (130). The bottom of the can (300) is provided with an exhaust hole (310), which is connected to the receiving cavity (110). A sealing layer (400) covers and seals the vent (310). When the sealing layer (400) is removed from the vent (310), the vent (310) is used to release the negative pressure between the contents and the side of the receiving cavity (110) facing the bottom of the tank (100).

2. The storage tank according to claim 1, characterized in that, The exhaust port (310) includes a plurality of such ports, which are arranged at intervals.

3. The storage tank according to claim 1, characterized in that, The diameter of the exhaust port (310) is greater than or equal to 1 mm and less than or equal to 20 mm.

4. The storage tank according to claim 1, characterized in that, The plurality of vent holes (310) are arranged at intervals along the circumference of the tank bottom (300) and are located near the central region of the tank bottom (300).

5. The storage tank according to claim 1, characterized in that, The inner edge of the vent (310) is covered with a corrosion-resistant layer.

6. The storage tank according to claim 1, characterized in that, The inner edge of the vent (310) is provided with an inwardly rolled circular structure (500) that curls toward the interior of the receiving cavity (110).

7. The storage tank according to claim 1, characterized in that, The outline shape of the exhaust port (310) is one of the following: circular, rectangular, square, elliptical, or irregular.

8. The storage tank according to claim 5, characterized in that, The corrosion-resistant layer is an epoxy resin layer or a polyurethane layer.

9. The storage tank according to any one of claims 1-8, characterized in that, The sealing layer (400) includes a sealing part (410) and an opening part (420); The sealing part (410) is connected to the outer surface of the bottom of the tank (300) and is used to completely cover and seal the vent (310); The opening part (420) is connected to one end of the sealing part (410) and is spaced apart from the surface of the bottom of the can (300). The opening part (420) is used to drive the sealing part (410) to separate from the bottom of the can (300) under the action of external force.

10. The storage tank according to any one of claims 1-8, characterized in that, The sealing layer (400) is a metal sealing layer or a plastic sealing layer.

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